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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * drivers/net/macsec.c - MACsec device
4 *
5 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
6 */
7
8#include <linux/types.h>
9#include <linux/skbuff.h>
10#include <linux/socket.h>
11#include <linux/module.h>
12#include <crypto/aead.h>
13#include <linux/etherdevice.h>
14#include <linux/netdevice.h>
15#include <linux/rtnetlink.h>
16#include <linux/refcount.h>
17#include <net/genetlink.h>
18#include <net/sock.h>
19#include <net/gro_cells.h>
20#include <net/macsec.h>
21#include <net/dst_metadata.h>
22#include <linux/phy.h>
23#include <linux/byteorder/generic.h>
24#include <linux/if_arp.h>
25
26#include <uapi/linux/if_macsec.h>
27
28/* SecTAG length = macsec_eth_header without the optional SCI */
29#define MACSEC_TAG_LEN 6
30
31struct macsec_eth_header {
32 struct ethhdr eth;
33 /* SecTAG */
34 u8 tci_an;
35#if defined(__LITTLE_ENDIAN_BITFIELD)
36 u8 short_length:6,
37 unused:2;
38#elif defined(__BIG_ENDIAN_BITFIELD)
39 u8 unused:2,
40 short_length:6;
41#else
42#error "Please fix <asm/byteorder.h>"
43#endif
44 __be32 packet_number;
45 u8 secure_channel_id[8]; /* optional */
46} __packed;
47
48/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
49#define MIN_NON_SHORT_LEN 48
50
51#define GCM_AES_IV_LEN 12
52
53#define for_each_rxsc(secy, sc) \
54 for (sc = rcu_dereference_bh(secy->rx_sc); \
55 sc; \
56 sc = rcu_dereference_bh(sc->next))
57#define for_each_rxsc_rtnl(secy, sc) \
58 for (sc = rtnl_dereference(secy->rx_sc); \
59 sc; \
60 sc = rtnl_dereference(sc->next))
61
62#define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31)))
63
64struct gcm_iv_xpn {
65 union {
66 u8 short_secure_channel_id[4];
67 ssci_t ssci;
68 };
69 __be64 pn;
70} __packed;
71
72struct gcm_iv {
73 union {
74 u8 secure_channel_id[8];
75 sci_t sci;
76 };
77 __be32 pn;
78};
79
80#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
81
82struct pcpu_secy_stats {
83 struct macsec_dev_stats stats;
84 struct u64_stats_sync syncp;
85};
86
87/**
88 * struct macsec_dev - private data
89 * @secy: SecY config
90 * @real_dev: pointer to underlying netdevice
91 * @dev_tracker: refcount tracker for @real_dev reference
92 * @stats: MACsec device stats
93 * @secys: linked list of SecY's on the underlying device
94 * @gro_cells: pointer to the Generic Receive Offload cell
95 * @offload: status of offloading on the MACsec device
96 * @insert_tx_tag: when offloading, device requires to insert an
97 * additional tag
98 */
99struct macsec_dev {
100 struct macsec_secy secy;
101 struct net_device *real_dev;
102 netdevice_tracker dev_tracker;
103 struct pcpu_secy_stats __percpu *stats;
104 struct list_head secys;
105 struct gro_cells gro_cells;
106 enum macsec_offload offload;
107 bool insert_tx_tag;
108};
109
110/**
111 * struct macsec_rxh_data - rx_handler private argument
112 * @secys: linked list of SecY's on this underlying device
113 */
114struct macsec_rxh_data {
115 struct list_head secys;
116};
117
118static struct macsec_dev *macsec_priv(const struct net_device *dev)
119{
120 return (struct macsec_dev *)netdev_priv(dev);
121}
122
123static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
124{
125 return rcu_dereference_bh(dev->rx_handler_data);
126}
127
128static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
129{
130 return rtnl_dereference(dev->rx_handler_data);
131}
132
133struct macsec_cb {
134 struct aead_request *req;
135 union {
136 struct macsec_tx_sa *tx_sa;
137 struct macsec_rx_sa *rx_sa;
138 };
139 u8 assoc_num;
140 bool valid;
141 bool has_sci;
142};
143
144static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
145{
146 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
147
148 if (!sa || !sa->active)
149 return NULL;
150
151 if (!refcount_inc_not_zero(&sa->refcnt))
152 return NULL;
153
154 return sa;
155}
156
157static void free_rx_sc_rcu(struct rcu_head *head)
158{
159 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
160
161 free_percpu(rx_sc->stats);
162 kfree(rx_sc);
163}
164
165static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
166{
167 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
168}
169
170static void macsec_rxsc_put(struct macsec_rx_sc *sc)
171{
172 if (refcount_dec_and_test(&sc->refcnt))
173 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
174}
175
176static void free_rxsa(struct rcu_head *head)
177{
178 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
179
180 crypto_free_aead(sa->key.tfm);
181 free_percpu(sa->stats);
182 kfree(sa);
183}
184
185static void macsec_rxsa_put(struct macsec_rx_sa *sa)
186{
187 if (refcount_dec_and_test(&sa->refcnt))
188 call_rcu(&sa->rcu, free_rxsa);
189}
190
191static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
192{
193 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
194
195 if (!sa || !sa->active)
196 return NULL;
197
198 if (!refcount_inc_not_zero(&sa->refcnt))
199 return NULL;
200
201 return sa;
202}
203
204static void free_txsa(struct rcu_head *head)
205{
206 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
207
208 crypto_free_aead(sa->key.tfm);
209 free_percpu(sa->stats);
210 kfree(sa);
211}
212
213static void macsec_txsa_put(struct macsec_tx_sa *sa)
214{
215 if (refcount_dec_and_test(&sa->refcnt))
216 call_rcu(&sa->rcu, free_txsa);
217}
218
219static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
220{
221 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
222 return (struct macsec_cb *)skb->cb;
223}
224
225#define MACSEC_PORT_SCB (0x0000)
226#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
227#define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
228
229#define MACSEC_GCM_AES_128_SAK_LEN 16
230#define MACSEC_GCM_AES_256_SAK_LEN 32
231
232#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
233#define DEFAULT_XPN false
234#define DEFAULT_SEND_SCI true
235#define DEFAULT_ENCRYPT false
236#define DEFAULT_ENCODING_SA 0
237#define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1))
238
239static sci_t make_sci(const u8 *addr, __be16 port)
240{
241 sci_t sci;
242
243 memcpy(&sci, addr, ETH_ALEN);
244 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
245
246 return sci;
247}
248
249static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
250{
251 sci_t sci;
252
253 if (sci_present)
254 memcpy(&sci, hdr->secure_channel_id,
255 sizeof(hdr->secure_channel_id));
256 else
257 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
258
259 return sci;
260}
261
262static unsigned int macsec_sectag_len(bool sci_present)
263{
264 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
265}
266
267static unsigned int macsec_hdr_len(bool sci_present)
268{
269 return macsec_sectag_len(sci_present) + ETH_HLEN;
270}
271
272static unsigned int macsec_extra_len(bool sci_present)
273{
274 return macsec_sectag_len(sci_present) + sizeof(__be16);
275}
276
277/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
278static void macsec_fill_sectag(struct macsec_eth_header *h,
279 const struct macsec_secy *secy, u32 pn,
280 bool sci_present)
281{
282 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
283
284 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
285 h->eth.h_proto = htons(ETH_P_MACSEC);
286
287 if (sci_present) {
288 h->tci_an |= MACSEC_TCI_SC;
289 memcpy(&h->secure_channel_id, &secy->sci,
290 sizeof(h->secure_channel_id));
291 } else {
292 if (tx_sc->end_station)
293 h->tci_an |= MACSEC_TCI_ES;
294 if (tx_sc->scb)
295 h->tci_an |= MACSEC_TCI_SCB;
296 }
297
298 h->packet_number = htonl(pn);
299
300 /* with GCM, C/E clear for !encrypt, both set for encrypt */
301 if (tx_sc->encrypt)
302 h->tci_an |= MACSEC_TCI_CONFID;
303 else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN)
304 h->tci_an |= MACSEC_TCI_C;
305
306 h->tci_an |= tx_sc->encoding_sa;
307}
308
309static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
310{
311 if (data_len < MIN_NON_SHORT_LEN)
312 h->short_length = data_len;
313}
314
315/* Checks if a MACsec interface is being offloaded to an hardware engine */
316static bool macsec_is_offloaded(struct macsec_dev *macsec)
317{
318 if (macsec->offload == MACSEC_OFFLOAD_MAC ||
319 macsec->offload == MACSEC_OFFLOAD_PHY)
320 return true;
321
322 return false;
323}
324
325/* Checks if underlying layers implement MACsec offloading functions. */
326static bool macsec_check_offload(enum macsec_offload offload,
327 struct macsec_dev *macsec)
328{
329 if (!macsec || !macsec->real_dev)
330 return false;
331
332 if (offload == MACSEC_OFFLOAD_PHY)
333 return macsec->real_dev->phydev &&
334 macsec->real_dev->phydev->macsec_ops;
335 else if (offload == MACSEC_OFFLOAD_MAC)
336 return macsec->real_dev->features & NETIF_F_HW_MACSEC &&
337 macsec->real_dev->macsec_ops;
338
339 return false;
340}
341
342static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload,
343 struct macsec_dev *macsec,
344 struct macsec_context *ctx)
345{
346 if (ctx) {
347 memset(ctx, 0, sizeof(*ctx));
348 ctx->offload = offload;
349
350 if (offload == MACSEC_OFFLOAD_PHY)
351 ctx->phydev = macsec->real_dev->phydev;
352 else if (offload == MACSEC_OFFLOAD_MAC)
353 ctx->netdev = macsec->real_dev;
354 }
355
356 if (offload == MACSEC_OFFLOAD_PHY)
357 return macsec->real_dev->phydev->macsec_ops;
358 else
359 return macsec->real_dev->macsec_ops;
360}
361
362/* Returns a pointer to the MACsec ops struct if any and updates the MACsec
363 * context device reference if provided.
364 */
365static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
366 struct macsec_context *ctx)
367{
368 if (!macsec_check_offload(macsec->offload, macsec))
369 return NULL;
370
371 return __macsec_get_ops(macsec->offload, macsec, ctx);
372}
373
374/* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */
375static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn)
376{
377 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
378 int len = skb->len - 2 * ETH_ALEN;
379 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
380
381 /* a) It comprises at least 17 octets */
382 if (skb->len <= 16)
383 return false;
384
385 /* b) MACsec EtherType: already checked */
386
387 /* c) V bit is clear */
388 if (h->tci_an & MACSEC_TCI_VERSION)
389 return false;
390
391 /* d) ES or SCB => !SC */
392 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
393 (h->tci_an & MACSEC_TCI_SC))
394 return false;
395
396 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
397 if (h->unused)
398 return false;
399
400 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */
401 if (!h->packet_number && !xpn)
402 return false;
403
404 /* length check, f) g) h) i) */
405 if (h->short_length)
406 return len == extra_len + h->short_length;
407 return len >= extra_len + MIN_NON_SHORT_LEN;
408}
409
410#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
411#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
412
413static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn,
414 salt_t salt)
415{
416 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv;
417
418 gcm_iv->ssci = ssci ^ salt.ssci;
419 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn;
420}
421
422static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
423{
424 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
425
426 gcm_iv->sci = sci;
427 gcm_iv->pn = htonl(pn);
428}
429
430static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
431{
432 return (struct macsec_eth_header *)skb_mac_header(skb);
433}
434
435static void __macsec_pn_wrapped(struct macsec_secy *secy,
436 struct macsec_tx_sa *tx_sa)
437{
438 pr_debug("PN wrapped, transitioning to !oper\n");
439 tx_sa->active = false;
440 if (secy->protect_frames)
441 secy->operational = false;
442}
443
444void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
445{
446 spin_lock_bh(&tx_sa->lock);
447 __macsec_pn_wrapped(secy, tx_sa);
448 spin_unlock_bh(&tx_sa->lock);
449}
450EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
451
452static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
453 struct macsec_secy *secy)
454{
455 pn_t pn;
456
457 spin_lock_bh(&tx_sa->lock);
458
459 pn = tx_sa->next_pn_halves;
460 if (secy->xpn)
461 tx_sa->next_pn++;
462 else
463 tx_sa->next_pn_halves.lower++;
464
465 if (tx_sa->next_pn == 0)
466 __macsec_pn_wrapped(secy, tx_sa);
467 spin_unlock_bh(&tx_sa->lock);
468
469 return pn;
470}
471
472static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
473{
474 struct macsec_dev *macsec = netdev_priv(dev);
475
476 skb->dev = macsec->real_dev;
477 skb_reset_mac_header(skb);
478 skb->protocol = eth_hdr(skb)->h_proto;
479}
480
481static unsigned int macsec_msdu_len(struct sk_buff *skb)
482{
483 struct macsec_dev *macsec = macsec_priv(skb->dev);
484 struct macsec_secy *secy = &macsec->secy;
485 bool sci_present = macsec_skb_cb(skb)->has_sci;
486
487 return skb->len - macsec_hdr_len(sci_present) - secy->icv_len;
488}
489
490static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
491 struct macsec_tx_sa *tx_sa)
492{
493 unsigned int msdu_len = macsec_msdu_len(skb);
494 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
495
496 u64_stats_update_begin(&txsc_stats->syncp);
497 if (tx_sc->encrypt) {
498 txsc_stats->stats.OutOctetsEncrypted += msdu_len;
499 txsc_stats->stats.OutPktsEncrypted++;
500 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
501 } else {
502 txsc_stats->stats.OutOctetsProtected += msdu_len;
503 txsc_stats->stats.OutPktsProtected++;
504 this_cpu_inc(tx_sa->stats->OutPktsProtected);
505 }
506 u64_stats_update_end(&txsc_stats->syncp);
507}
508
509static void count_tx(struct net_device *dev, int ret, int len)
510{
511 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN))
512 dev_sw_netstats_tx_add(dev, 1, len);
513}
514
515static void macsec_encrypt_done(void *data, int err)
516{
517 struct sk_buff *skb = data;
518 struct net_device *dev = skb->dev;
519 struct macsec_dev *macsec = macsec_priv(dev);
520 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
521 int len, ret;
522
523 aead_request_free(macsec_skb_cb(skb)->req);
524
525 rcu_read_lock_bh();
526 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
527 /* packet is encrypted/protected so tx_bytes must be calculated */
528 len = macsec_msdu_len(skb) + 2 * ETH_ALEN;
529 macsec_encrypt_finish(skb, dev);
530 ret = dev_queue_xmit(skb);
531 count_tx(dev, ret, len);
532 rcu_read_unlock_bh();
533
534 macsec_txsa_put(sa);
535 dev_put(dev);
536}
537
538static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
539 unsigned char **iv,
540 struct scatterlist **sg,
541 int num_frags)
542{
543 size_t size, iv_offset, sg_offset;
544 struct aead_request *req;
545 void *tmp;
546
547 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
548 iv_offset = size;
549 size += GCM_AES_IV_LEN;
550
551 size = ALIGN(size, __alignof__(struct scatterlist));
552 sg_offset = size;
553 size += sizeof(struct scatterlist) * num_frags;
554
555 tmp = kmalloc(size, GFP_ATOMIC);
556 if (!tmp)
557 return NULL;
558
559 *iv = (unsigned char *)(tmp + iv_offset);
560 *sg = (struct scatterlist *)(tmp + sg_offset);
561 req = tmp;
562
563 aead_request_set_tfm(req, tfm);
564
565 return req;
566}
567
568static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
569 struct net_device *dev)
570{
571 int ret;
572 struct scatterlist *sg;
573 struct sk_buff *trailer;
574 unsigned char *iv;
575 struct ethhdr *eth;
576 struct macsec_eth_header *hh;
577 size_t unprotected_len;
578 struct aead_request *req;
579 struct macsec_secy *secy;
580 struct macsec_tx_sc *tx_sc;
581 struct macsec_tx_sa *tx_sa;
582 struct macsec_dev *macsec = macsec_priv(dev);
583 bool sci_present;
584 pn_t pn;
585
586 secy = &macsec->secy;
587 tx_sc = &secy->tx_sc;
588
589 /* 10.5.1 TX SA assignment */
590 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
591 if (!tx_sa) {
592 secy->operational = false;
593 kfree_skb(skb);
594 return ERR_PTR(-EINVAL);
595 }
596
597 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
598 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
599 struct sk_buff *nskb = skb_copy_expand(skb,
600 MACSEC_NEEDED_HEADROOM,
601 MACSEC_NEEDED_TAILROOM,
602 GFP_ATOMIC);
603 if (likely(nskb)) {
604 consume_skb(skb);
605 skb = nskb;
606 } else {
607 macsec_txsa_put(tx_sa);
608 kfree_skb(skb);
609 return ERR_PTR(-ENOMEM);
610 }
611 } else {
612 skb = skb_unshare(skb, GFP_ATOMIC);
613 if (!skb) {
614 macsec_txsa_put(tx_sa);
615 return ERR_PTR(-ENOMEM);
616 }
617 }
618
619 unprotected_len = skb->len;
620 eth = eth_hdr(skb);
621 sci_present = macsec_send_sci(secy);
622 hh = skb_push(skb, macsec_extra_len(sci_present));
623 memmove(hh, eth, 2 * ETH_ALEN);
624
625 pn = tx_sa_update_pn(tx_sa, secy);
626 if (pn.full64 == 0) {
627 macsec_txsa_put(tx_sa);
628 kfree_skb(skb);
629 return ERR_PTR(-ENOLINK);
630 }
631 macsec_fill_sectag(hh, secy, pn.lower, sci_present);
632 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
633
634 skb_put(skb, secy->icv_len);
635
636 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
637 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
638
639 u64_stats_update_begin(&secy_stats->syncp);
640 secy_stats->stats.OutPktsTooLong++;
641 u64_stats_update_end(&secy_stats->syncp);
642
643 macsec_txsa_put(tx_sa);
644 kfree_skb(skb);
645 return ERR_PTR(-EINVAL);
646 }
647
648 ret = skb_cow_data(skb, 0, &trailer);
649 if (unlikely(ret < 0)) {
650 macsec_txsa_put(tx_sa);
651 kfree_skb(skb);
652 return ERR_PTR(ret);
653 }
654
655 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
656 if (!req) {
657 macsec_txsa_put(tx_sa);
658 kfree_skb(skb);
659 return ERR_PTR(-ENOMEM);
660 }
661
662 if (secy->xpn)
663 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt);
664 else
665 macsec_fill_iv(iv, secy->sci, pn.lower);
666
667 sg_init_table(sg, ret);
668 ret = skb_to_sgvec(skb, sg, 0, skb->len);
669 if (unlikely(ret < 0)) {
670 aead_request_free(req);
671 macsec_txsa_put(tx_sa);
672 kfree_skb(skb);
673 return ERR_PTR(ret);
674 }
675
676 if (tx_sc->encrypt) {
677 int len = skb->len - macsec_hdr_len(sci_present) -
678 secy->icv_len;
679 aead_request_set_crypt(req, sg, sg, len, iv);
680 aead_request_set_ad(req, macsec_hdr_len(sci_present));
681 } else {
682 aead_request_set_crypt(req, sg, sg, 0, iv);
683 aead_request_set_ad(req, skb->len - secy->icv_len);
684 }
685
686 macsec_skb_cb(skb)->req = req;
687 macsec_skb_cb(skb)->tx_sa = tx_sa;
688 macsec_skb_cb(skb)->has_sci = sci_present;
689 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
690
691 dev_hold(skb->dev);
692 ret = crypto_aead_encrypt(req);
693 if (ret == -EINPROGRESS) {
694 return ERR_PTR(ret);
695 } else if (ret != 0) {
696 dev_put(skb->dev);
697 kfree_skb(skb);
698 aead_request_free(req);
699 macsec_txsa_put(tx_sa);
700 return ERR_PTR(-EINVAL);
701 }
702
703 dev_put(skb->dev);
704 aead_request_free(req);
705 macsec_txsa_put(tx_sa);
706
707 return skb;
708}
709
710static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
711{
712 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
713 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
714 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
715 u32 lowest_pn = 0;
716
717 spin_lock(&rx_sa->lock);
718 if (rx_sa->next_pn_halves.lower >= secy->replay_window)
719 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
720
721 /* Now perform replay protection check again
722 * (see IEEE 802.1AE-2006 figure 10-5)
723 */
724 if (secy->replay_protect && pn < lowest_pn &&
725 (!secy->xpn || pn_same_half(pn, lowest_pn))) {
726 spin_unlock(&rx_sa->lock);
727 u64_stats_update_begin(&rxsc_stats->syncp);
728 rxsc_stats->stats.InPktsLate++;
729 u64_stats_update_end(&rxsc_stats->syncp);
730 DEV_STATS_INC(secy->netdev, rx_dropped);
731 return false;
732 }
733
734 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
735 unsigned int msdu_len = macsec_msdu_len(skb);
736 u64_stats_update_begin(&rxsc_stats->syncp);
737 if (hdr->tci_an & MACSEC_TCI_E)
738 rxsc_stats->stats.InOctetsDecrypted += msdu_len;
739 else
740 rxsc_stats->stats.InOctetsValidated += msdu_len;
741 u64_stats_update_end(&rxsc_stats->syncp);
742 }
743
744 if (!macsec_skb_cb(skb)->valid) {
745 spin_unlock(&rx_sa->lock);
746
747 /* 10.6.5 */
748 if (hdr->tci_an & MACSEC_TCI_C ||
749 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
750 u64_stats_update_begin(&rxsc_stats->syncp);
751 rxsc_stats->stats.InPktsNotValid++;
752 u64_stats_update_end(&rxsc_stats->syncp);
753 this_cpu_inc(rx_sa->stats->InPktsNotValid);
754 DEV_STATS_INC(secy->netdev, rx_errors);
755 return false;
756 }
757
758 u64_stats_update_begin(&rxsc_stats->syncp);
759 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
760 rxsc_stats->stats.InPktsInvalid++;
761 this_cpu_inc(rx_sa->stats->InPktsInvalid);
762 } else if (pn < lowest_pn) {
763 rxsc_stats->stats.InPktsDelayed++;
764 } else {
765 rxsc_stats->stats.InPktsUnchecked++;
766 }
767 u64_stats_update_end(&rxsc_stats->syncp);
768 } else {
769 u64_stats_update_begin(&rxsc_stats->syncp);
770 if (pn < lowest_pn) {
771 rxsc_stats->stats.InPktsDelayed++;
772 } else {
773 rxsc_stats->stats.InPktsOK++;
774 this_cpu_inc(rx_sa->stats->InPktsOK);
775 }
776 u64_stats_update_end(&rxsc_stats->syncp);
777
778 // Instead of "pn >=" - to support pn overflow in xpn
779 if (pn + 1 > rx_sa->next_pn_halves.lower) {
780 rx_sa->next_pn_halves.lower = pn + 1;
781 } else if (secy->xpn &&
782 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
783 rx_sa->next_pn_halves.upper++;
784 rx_sa->next_pn_halves.lower = pn + 1;
785 }
786
787 spin_unlock(&rx_sa->lock);
788 }
789
790 return true;
791}
792
793static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
794{
795 skb->pkt_type = PACKET_HOST;
796 skb->protocol = eth_type_trans(skb, dev);
797
798 skb_reset_network_header(skb);
799 if (!skb_transport_header_was_set(skb))
800 skb_reset_transport_header(skb);
801 skb_reset_mac_len(skb);
802}
803
804static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
805{
806 skb->ip_summed = CHECKSUM_NONE;
807 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
808 skb_pull(skb, hdr_len);
809 pskb_trim_unique(skb, skb->len - icv_len);
810}
811
812static void count_rx(struct net_device *dev, int len)
813{
814 dev_sw_netstats_rx_add(dev, len);
815}
816
817static void macsec_decrypt_done(void *data, int err)
818{
819 struct sk_buff *skb = data;
820 struct net_device *dev = skb->dev;
821 struct macsec_dev *macsec = macsec_priv(dev);
822 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
823 struct macsec_rx_sc *rx_sc = rx_sa->sc;
824 int len;
825 u32 pn;
826
827 aead_request_free(macsec_skb_cb(skb)->req);
828
829 if (!err)
830 macsec_skb_cb(skb)->valid = true;
831
832 rcu_read_lock_bh();
833 pn = ntohl(macsec_ethhdr(skb)->packet_number);
834 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
835 rcu_read_unlock_bh();
836 kfree_skb(skb);
837 goto out;
838 }
839
840 macsec_finalize_skb(skb, macsec->secy.icv_len,
841 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
842 len = skb->len;
843 macsec_reset_skb(skb, macsec->secy.netdev);
844
845 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
846 count_rx(dev, len);
847
848 rcu_read_unlock_bh();
849
850out:
851 macsec_rxsa_put(rx_sa);
852 macsec_rxsc_put(rx_sc);
853 dev_put(dev);
854}
855
856static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
857 struct net_device *dev,
858 struct macsec_rx_sa *rx_sa,
859 sci_t sci,
860 struct macsec_secy *secy)
861{
862 int ret;
863 struct scatterlist *sg;
864 struct sk_buff *trailer;
865 unsigned char *iv;
866 struct aead_request *req;
867 struct macsec_eth_header *hdr;
868 u32 hdr_pn;
869 u16 icv_len = secy->icv_len;
870
871 macsec_skb_cb(skb)->valid = false;
872 skb = skb_share_check(skb, GFP_ATOMIC);
873 if (!skb)
874 return ERR_PTR(-ENOMEM);
875
876 ret = skb_cow_data(skb, 0, &trailer);
877 if (unlikely(ret < 0)) {
878 kfree_skb(skb);
879 return ERR_PTR(ret);
880 }
881 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
882 if (!req) {
883 kfree_skb(skb);
884 return ERR_PTR(-ENOMEM);
885 }
886
887 hdr = (struct macsec_eth_header *)skb->data;
888 hdr_pn = ntohl(hdr->packet_number);
889
890 if (secy->xpn) {
891 pn_t recovered_pn = rx_sa->next_pn_halves;
892
893 recovered_pn.lower = hdr_pn;
894 if (hdr_pn < rx_sa->next_pn_halves.lower &&
895 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
896 recovered_pn.upper++;
897
898 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
899 rx_sa->key.salt);
900 } else {
901 macsec_fill_iv(iv, sci, hdr_pn);
902 }
903
904 sg_init_table(sg, ret);
905 ret = skb_to_sgvec(skb, sg, 0, skb->len);
906 if (unlikely(ret < 0)) {
907 aead_request_free(req);
908 kfree_skb(skb);
909 return ERR_PTR(ret);
910 }
911
912 if (hdr->tci_an & MACSEC_TCI_E) {
913 /* confidentiality: ethernet + macsec header
914 * authenticated, encrypted payload
915 */
916 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
917
918 aead_request_set_crypt(req, sg, sg, len, iv);
919 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
920 skb = skb_unshare(skb, GFP_ATOMIC);
921 if (!skb) {
922 aead_request_free(req);
923 return ERR_PTR(-ENOMEM);
924 }
925 } else {
926 /* integrity only: all headers + data authenticated */
927 aead_request_set_crypt(req, sg, sg, icv_len, iv);
928 aead_request_set_ad(req, skb->len - icv_len);
929 }
930
931 macsec_skb_cb(skb)->req = req;
932 skb->dev = dev;
933 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
934
935 dev_hold(dev);
936 ret = crypto_aead_decrypt(req);
937 if (ret == -EINPROGRESS) {
938 return ERR_PTR(ret);
939 } else if (ret != 0) {
940 /* decryption/authentication failed
941 * 10.6 if validateFrames is disabled, deliver anyway
942 */
943 if (ret != -EBADMSG) {
944 kfree_skb(skb);
945 skb = ERR_PTR(ret);
946 }
947 } else {
948 macsec_skb_cb(skb)->valid = true;
949 }
950 dev_put(dev);
951
952 aead_request_free(req);
953
954 return skb;
955}
956
957static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
958{
959 struct macsec_rx_sc *rx_sc;
960
961 for_each_rxsc(secy, rx_sc) {
962 if (rx_sc->sci == sci)
963 return rx_sc;
964 }
965
966 return NULL;
967}
968
969static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
970{
971 struct macsec_rx_sc *rx_sc;
972
973 for_each_rxsc_rtnl(secy, rx_sc) {
974 if (rx_sc->sci == sci)
975 return rx_sc;
976 }
977
978 return NULL;
979}
980
981static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
982{
983 /* Deliver to the uncontrolled port by default */
984 enum rx_handler_result ret = RX_HANDLER_PASS;
985 struct ethhdr *hdr = eth_hdr(skb);
986 struct metadata_dst *md_dst;
987 struct macsec_rxh_data *rxd;
988 struct macsec_dev *macsec;
989 bool is_macsec_md_dst;
990
991 rcu_read_lock();
992 rxd = macsec_data_rcu(skb->dev);
993 md_dst = skb_metadata_dst(skb);
994 is_macsec_md_dst = md_dst && md_dst->type == METADATA_MACSEC;
995
996 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
997 struct sk_buff *nskb;
998 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
999 struct net_device *ndev = macsec->secy.netdev;
1000
1001 /* If h/w offloading is enabled, HW decodes frames and strips
1002 * the SecTAG, so we have to deduce which port to deliver to.
1003 */
1004 if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
1005 const struct macsec_ops *ops;
1006
1007 ops = macsec_get_ops(macsec, NULL);
1008
1009 if (ops->rx_uses_md_dst && !is_macsec_md_dst)
1010 continue;
1011
1012 if (is_macsec_md_dst) {
1013 struct macsec_rx_sc *rx_sc;
1014
1015 /* All drivers that implement MACsec offload
1016 * support using skb metadata destinations must
1017 * indicate that they do so.
1018 */
1019 DEBUG_NET_WARN_ON_ONCE(!ops->rx_uses_md_dst);
1020 rx_sc = find_rx_sc(&macsec->secy,
1021 md_dst->u.macsec_info.sci);
1022 if (!rx_sc)
1023 continue;
1024 /* device indicated macsec offload occurred */
1025 skb->dev = ndev;
1026 skb->pkt_type = PACKET_HOST;
1027 eth_skb_pkt_type(skb, ndev);
1028 ret = RX_HANDLER_ANOTHER;
1029 goto out;
1030 }
1031
1032 /* This datapath is insecure because it is unable to
1033 * enforce isolation of broadcast/multicast traffic and
1034 * unicast traffic with promiscuous mode on the macsec
1035 * netdev. Since the core stack has no mechanism to
1036 * check that the hardware did indeed receive MACsec
1037 * traffic, it is possible that the response handling
1038 * done by the MACsec port was to a plaintext packet.
1039 * This violates the MACsec protocol standard.
1040 */
1041 if (ether_addr_equal_64bits(hdr->h_dest,
1042 ndev->dev_addr)) {
1043 /* exact match, divert skb to this port */
1044 skb->dev = ndev;
1045 skb->pkt_type = PACKET_HOST;
1046 ret = RX_HANDLER_ANOTHER;
1047 goto out;
1048 } else if (is_multicast_ether_addr_64bits(
1049 hdr->h_dest)) {
1050 /* multicast frame, deliver on this port too */
1051 nskb = skb_clone(skb, GFP_ATOMIC);
1052 if (!nskb)
1053 break;
1054
1055 nskb->dev = ndev;
1056 eth_skb_pkt_type(nskb, ndev);
1057
1058 __netif_rx(nskb);
1059 } else if (ndev->flags & IFF_PROMISC) {
1060 skb->dev = ndev;
1061 skb->pkt_type = PACKET_HOST;
1062 ret = RX_HANDLER_ANOTHER;
1063 goto out;
1064 }
1065
1066 continue;
1067 }
1068
1069 /* 10.6 If the management control validateFrames is not
1070 * Strict, frames without a SecTAG are received, counted, and
1071 * delivered to the Controlled Port
1072 */
1073 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1074 u64_stats_update_begin(&secy_stats->syncp);
1075 secy_stats->stats.InPktsNoTag++;
1076 u64_stats_update_end(&secy_stats->syncp);
1077 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1078 continue;
1079 }
1080
1081 /* deliver on this port */
1082 nskb = skb_clone(skb, GFP_ATOMIC);
1083 if (!nskb)
1084 break;
1085
1086 nskb->dev = ndev;
1087
1088 if (__netif_rx(nskb) == NET_RX_SUCCESS) {
1089 u64_stats_update_begin(&secy_stats->syncp);
1090 secy_stats->stats.InPktsUntagged++;
1091 u64_stats_update_end(&secy_stats->syncp);
1092 }
1093 }
1094
1095out:
1096 rcu_read_unlock();
1097 return ret;
1098}
1099
1100static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1101{
1102 struct sk_buff *skb = *pskb;
1103 struct net_device *dev = skb->dev;
1104 struct macsec_eth_header *hdr;
1105 struct macsec_secy *secy = NULL;
1106 struct macsec_rx_sc *rx_sc;
1107 struct macsec_rx_sa *rx_sa;
1108 struct macsec_rxh_data *rxd;
1109 struct macsec_dev *macsec;
1110 unsigned int len;
1111 sci_t sci;
1112 u32 hdr_pn;
1113 bool cbit;
1114 struct pcpu_rx_sc_stats *rxsc_stats;
1115 struct pcpu_secy_stats *secy_stats;
1116 bool pulled_sci;
1117 int ret;
1118
1119 if (skb_headroom(skb) < ETH_HLEN)
1120 goto drop_direct;
1121
1122 hdr = macsec_ethhdr(skb);
1123 if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
1124 return handle_not_macsec(skb);
1125
1126 skb = skb_unshare(skb, GFP_ATOMIC);
1127 *pskb = skb;
1128 if (!skb)
1129 return RX_HANDLER_CONSUMED;
1130
1131 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1132 if (!pulled_sci) {
1133 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1134 goto drop_direct;
1135 }
1136
1137 hdr = macsec_ethhdr(skb);
1138
1139 /* Frames with a SecTAG that has the TCI E bit set but the C
1140 * bit clear are discarded, as this reserved encoding is used
1141 * to identify frames with a SecTAG that are not to be
1142 * delivered to the Controlled Port.
1143 */
1144 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1145 return RX_HANDLER_PASS;
1146
1147 /* now, pull the extra length */
1148 if (hdr->tci_an & MACSEC_TCI_SC) {
1149 if (!pulled_sci)
1150 goto drop_direct;
1151 }
1152
1153 /* ethernet header is part of crypto processing */
1154 skb_push(skb, ETH_HLEN);
1155
1156 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1157 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1158 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1159
1160 rcu_read_lock();
1161 rxd = macsec_data_rcu(skb->dev);
1162
1163 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1164 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1165
1166 sc = sc ? macsec_rxsc_get(sc) : NULL;
1167
1168 if (sc) {
1169 secy = &macsec->secy;
1170 rx_sc = sc;
1171 break;
1172 }
1173 }
1174
1175 if (!secy)
1176 goto nosci;
1177
1178 dev = secy->netdev;
1179 macsec = macsec_priv(dev);
1180 secy_stats = this_cpu_ptr(macsec->stats);
1181 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1182
1183 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
1184 u64_stats_update_begin(&secy_stats->syncp);
1185 secy_stats->stats.InPktsBadTag++;
1186 u64_stats_update_end(&secy_stats->syncp);
1187 DEV_STATS_INC(secy->netdev, rx_errors);
1188 goto drop_nosa;
1189 }
1190
1191 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1192 if (!rx_sa) {
1193 /* 10.6.1 if the SA is not in use */
1194
1195 /* If validateFrames is Strict or the C bit in the
1196 * SecTAG is set, discard
1197 */
1198 if (hdr->tci_an & MACSEC_TCI_C ||
1199 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1200 u64_stats_update_begin(&rxsc_stats->syncp);
1201 rxsc_stats->stats.InPktsNotUsingSA++;
1202 u64_stats_update_end(&rxsc_stats->syncp);
1203 DEV_STATS_INC(secy->netdev, rx_errors);
1204 goto drop_nosa;
1205 }
1206
1207 /* not Strict, the frame (with the SecTAG and ICV
1208 * removed) is delivered to the Controlled Port.
1209 */
1210 u64_stats_update_begin(&rxsc_stats->syncp);
1211 rxsc_stats->stats.InPktsUnusedSA++;
1212 u64_stats_update_end(&rxsc_stats->syncp);
1213 goto deliver;
1214 }
1215
1216 /* First, PN check to avoid decrypting obviously wrong packets */
1217 hdr_pn = ntohl(hdr->packet_number);
1218 if (secy->replay_protect) {
1219 bool late;
1220
1221 spin_lock(&rx_sa->lock);
1222 late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
1223 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
1224
1225 if (secy->xpn)
1226 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
1227 spin_unlock(&rx_sa->lock);
1228
1229 if (late) {
1230 u64_stats_update_begin(&rxsc_stats->syncp);
1231 rxsc_stats->stats.InPktsLate++;
1232 u64_stats_update_end(&rxsc_stats->syncp);
1233 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1234 goto drop;
1235 }
1236 }
1237
1238 macsec_skb_cb(skb)->rx_sa = rx_sa;
1239
1240 /* Disabled && !changed text => skip validation */
1241 if (hdr->tci_an & MACSEC_TCI_C ||
1242 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1243 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1244
1245 if (IS_ERR(skb)) {
1246 /* the decrypt callback needs the reference */
1247 if (PTR_ERR(skb) != -EINPROGRESS) {
1248 macsec_rxsa_put(rx_sa);
1249 macsec_rxsc_put(rx_sc);
1250 }
1251 rcu_read_unlock();
1252 *pskb = NULL;
1253 return RX_HANDLER_CONSUMED;
1254 }
1255
1256 if (!macsec_post_decrypt(skb, secy, hdr_pn))
1257 goto drop;
1258
1259deliver:
1260 macsec_finalize_skb(skb, secy->icv_len,
1261 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1262 len = skb->len;
1263 macsec_reset_skb(skb, secy->netdev);
1264
1265 if (rx_sa)
1266 macsec_rxsa_put(rx_sa);
1267 macsec_rxsc_put(rx_sc);
1268
1269 skb_orphan(skb);
1270 ret = gro_cells_receive(&macsec->gro_cells, skb);
1271 if (ret == NET_RX_SUCCESS)
1272 count_rx(dev, len);
1273 else
1274 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1275
1276 rcu_read_unlock();
1277
1278 *pskb = NULL;
1279 return RX_HANDLER_CONSUMED;
1280
1281drop:
1282 macsec_rxsa_put(rx_sa);
1283drop_nosa:
1284 macsec_rxsc_put(rx_sc);
1285 rcu_read_unlock();
1286drop_direct:
1287 kfree_skb(skb);
1288 *pskb = NULL;
1289 return RX_HANDLER_CONSUMED;
1290
1291nosci:
1292 /* 10.6.1 if the SC is not found */
1293 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1294 if (!cbit)
1295 macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN,
1296 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1297
1298 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1299 struct sk_buff *nskb;
1300
1301 secy_stats = this_cpu_ptr(macsec->stats);
1302
1303 /* If validateFrames is Strict or the C bit in the
1304 * SecTAG is set, discard
1305 */
1306 if (cbit ||
1307 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1308 u64_stats_update_begin(&secy_stats->syncp);
1309 secy_stats->stats.InPktsNoSCI++;
1310 u64_stats_update_end(&secy_stats->syncp);
1311 DEV_STATS_INC(macsec->secy.netdev, rx_errors);
1312 continue;
1313 }
1314
1315 /* not strict, the frame (with the SecTAG and ICV
1316 * removed) is delivered to the Controlled Port.
1317 */
1318 nskb = skb_clone(skb, GFP_ATOMIC);
1319 if (!nskb)
1320 break;
1321
1322 macsec_reset_skb(nskb, macsec->secy.netdev);
1323
1324 ret = __netif_rx(nskb);
1325 if (ret == NET_RX_SUCCESS) {
1326 u64_stats_update_begin(&secy_stats->syncp);
1327 secy_stats->stats.InPktsUnknownSCI++;
1328 u64_stats_update_end(&secy_stats->syncp);
1329 } else {
1330 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1331 }
1332 }
1333
1334 rcu_read_unlock();
1335 *pskb = skb;
1336 return RX_HANDLER_PASS;
1337}
1338
1339static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1340{
1341 struct crypto_aead *tfm;
1342 int ret;
1343
1344 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1345
1346 if (IS_ERR(tfm))
1347 return tfm;
1348
1349 ret = crypto_aead_setkey(tfm, key, key_len);
1350 if (ret < 0)
1351 goto fail;
1352
1353 ret = crypto_aead_setauthsize(tfm, icv_len);
1354 if (ret < 0)
1355 goto fail;
1356
1357 return tfm;
1358fail:
1359 crypto_free_aead(tfm);
1360 return ERR_PTR(ret);
1361}
1362
1363static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1364 int icv_len)
1365{
1366 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1367 if (!rx_sa->stats)
1368 return -ENOMEM;
1369
1370 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1371 if (IS_ERR(rx_sa->key.tfm)) {
1372 free_percpu(rx_sa->stats);
1373 return PTR_ERR(rx_sa->key.tfm);
1374 }
1375
1376 rx_sa->ssci = MACSEC_UNDEF_SSCI;
1377 rx_sa->active = false;
1378 rx_sa->next_pn = 1;
1379 refcount_set(&rx_sa->refcnt, 1);
1380 spin_lock_init(&rx_sa->lock);
1381
1382 return 0;
1383}
1384
1385static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1386{
1387 rx_sa->active = false;
1388
1389 macsec_rxsa_put(rx_sa);
1390}
1391
1392static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1393{
1394 int i;
1395
1396 for (i = 0; i < MACSEC_NUM_AN; i++) {
1397 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1398
1399 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1400 if (sa)
1401 clear_rx_sa(sa);
1402 }
1403
1404 macsec_rxsc_put(rx_sc);
1405}
1406
1407static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1408{
1409 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1410
1411 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1412 rx_sc;
1413 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1414 if (rx_sc->sci == sci) {
1415 if (rx_sc->active)
1416 secy->n_rx_sc--;
1417 rcu_assign_pointer(*rx_scp, rx_sc->next);
1418 return rx_sc;
1419 }
1420 }
1421
1422 return NULL;
1423}
1424
1425static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci,
1426 bool active)
1427{
1428 struct macsec_rx_sc *rx_sc;
1429 struct macsec_dev *macsec;
1430 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1431 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1432 struct macsec_secy *secy;
1433
1434 list_for_each_entry(macsec, &rxd->secys, secys) {
1435 if (find_rx_sc_rtnl(&macsec->secy, sci))
1436 return ERR_PTR(-EEXIST);
1437 }
1438
1439 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1440 if (!rx_sc)
1441 return ERR_PTR(-ENOMEM);
1442
1443 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1444 if (!rx_sc->stats) {
1445 kfree(rx_sc);
1446 return ERR_PTR(-ENOMEM);
1447 }
1448
1449 rx_sc->sci = sci;
1450 rx_sc->active = active;
1451 refcount_set(&rx_sc->refcnt, 1);
1452
1453 secy = &macsec_priv(dev)->secy;
1454 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1455 rcu_assign_pointer(secy->rx_sc, rx_sc);
1456
1457 if (rx_sc->active)
1458 secy->n_rx_sc++;
1459
1460 return rx_sc;
1461}
1462
1463static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1464 int icv_len)
1465{
1466 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1467 if (!tx_sa->stats)
1468 return -ENOMEM;
1469
1470 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1471 if (IS_ERR(tx_sa->key.tfm)) {
1472 free_percpu(tx_sa->stats);
1473 return PTR_ERR(tx_sa->key.tfm);
1474 }
1475
1476 tx_sa->ssci = MACSEC_UNDEF_SSCI;
1477 tx_sa->active = false;
1478 refcount_set(&tx_sa->refcnt, 1);
1479 spin_lock_init(&tx_sa->lock);
1480
1481 return 0;
1482}
1483
1484static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1485{
1486 tx_sa->active = false;
1487
1488 macsec_txsa_put(tx_sa);
1489}
1490
1491static struct genl_family macsec_fam;
1492
1493static struct net_device *get_dev_from_nl(struct net *net,
1494 struct nlattr **attrs)
1495{
1496 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1497 struct net_device *dev;
1498
1499 dev = __dev_get_by_index(net, ifindex);
1500 if (!dev)
1501 return ERR_PTR(-ENODEV);
1502
1503 if (!netif_is_macsec(dev))
1504 return ERR_PTR(-ENODEV);
1505
1506 return dev;
1507}
1508
1509static enum macsec_offload nla_get_offload(const struct nlattr *nla)
1510{
1511 return (__force enum macsec_offload)nla_get_u8(nla);
1512}
1513
1514static sci_t nla_get_sci(const struct nlattr *nla)
1515{
1516 return (__force sci_t)nla_get_u64(nla);
1517}
1518
1519static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1520 int padattr)
1521{
1522 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1523}
1524
1525static ssci_t nla_get_ssci(const struct nlattr *nla)
1526{
1527 return (__force ssci_t)nla_get_u32(nla);
1528}
1529
1530static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
1531{
1532 return nla_put_u32(skb, attrtype, (__force u64)value);
1533}
1534
1535static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1536 struct nlattr **attrs,
1537 struct nlattr **tb_sa,
1538 struct net_device **devp,
1539 struct macsec_secy **secyp,
1540 struct macsec_tx_sc **scp,
1541 u8 *assoc_num)
1542{
1543 struct net_device *dev;
1544 struct macsec_secy *secy;
1545 struct macsec_tx_sc *tx_sc;
1546 struct macsec_tx_sa *tx_sa;
1547
1548 if (!tb_sa[MACSEC_SA_ATTR_AN])
1549 return ERR_PTR(-EINVAL);
1550
1551 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1552
1553 dev = get_dev_from_nl(net, attrs);
1554 if (IS_ERR(dev))
1555 return ERR_CAST(dev);
1556
1557 if (*assoc_num >= MACSEC_NUM_AN)
1558 return ERR_PTR(-EINVAL);
1559
1560 secy = &macsec_priv(dev)->secy;
1561 tx_sc = &secy->tx_sc;
1562
1563 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1564 if (!tx_sa)
1565 return ERR_PTR(-ENODEV);
1566
1567 *devp = dev;
1568 *scp = tx_sc;
1569 *secyp = secy;
1570 return tx_sa;
1571}
1572
1573static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1574 struct nlattr **attrs,
1575 struct nlattr **tb_rxsc,
1576 struct net_device **devp,
1577 struct macsec_secy **secyp)
1578{
1579 struct net_device *dev;
1580 struct macsec_secy *secy;
1581 struct macsec_rx_sc *rx_sc;
1582 sci_t sci;
1583
1584 dev = get_dev_from_nl(net, attrs);
1585 if (IS_ERR(dev))
1586 return ERR_CAST(dev);
1587
1588 secy = &macsec_priv(dev)->secy;
1589
1590 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1591 return ERR_PTR(-EINVAL);
1592
1593 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1594 rx_sc = find_rx_sc_rtnl(secy, sci);
1595 if (!rx_sc)
1596 return ERR_PTR(-ENODEV);
1597
1598 *secyp = secy;
1599 *devp = dev;
1600
1601 return rx_sc;
1602}
1603
1604static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1605 struct nlattr **attrs,
1606 struct nlattr **tb_rxsc,
1607 struct nlattr **tb_sa,
1608 struct net_device **devp,
1609 struct macsec_secy **secyp,
1610 struct macsec_rx_sc **scp,
1611 u8 *assoc_num)
1612{
1613 struct macsec_rx_sc *rx_sc;
1614 struct macsec_rx_sa *rx_sa;
1615
1616 if (!tb_sa[MACSEC_SA_ATTR_AN])
1617 return ERR_PTR(-EINVAL);
1618
1619 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1620 if (*assoc_num >= MACSEC_NUM_AN)
1621 return ERR_PTR(-EINVAL);
1622
1623 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1624 if (IS_ERR(rx_sc))
1625 return ERR_CAST(rx_sc);
1626
1627 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1628 if (!rx_sa)
1629 return ERR_PTR(-ENODEV);
1630
1631 *scp = rx_sc;
1632 return rx_sa;
1633}
1634
1635static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1636 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1637 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1638 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1639 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1640};
1641
1642static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1643 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1644 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1645};
1646
1647static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1648 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1649 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1650 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4),
1651 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1652 .len = MACSEC_KEYID_LEN, },
1653 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1654 .len = MACSEC_MAX_KEY_LEN, },
1655 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
1656 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
1657 .len = MACSEC_SALT_LEN, },
1658};
1659
1660static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
1661 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
1662};
1663
1664/* Offloads an operation to a device driver */
1665static int macsec_offload(int (* const func)(struct macsec_context *),
1666 struct macsec_context *ctx)
1667{
1668 int ret;
1669
1670 if (unlikely(!func))
1671 return 0;
1672
1673 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1674 mutex_lock(&ctx->phydev->lock);
1675
1676 ret = (*func)(ctx);
1677
1678 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1679 mutex_unlock(&ctx->phydev->lock);
1680
1681 return ret;
1682}
1683
1684static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1685{
1686 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1687 return -EINVAL;
1688
1689 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1690 return -EINVAL;
1691
1692 return 0;
1693}
1694
1695static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1696{
1697 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1698 return -EINVAL;
1699
1700 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1701 return -EINVAL;
1702
1703 return 0;
1704}
1705
1706static bool validate_add_rxsa(struct nlattr **attrs)
1707{
1708 if (!attrs[MACSEC_SA_ATTR_AN] ||
1709 !attrs[MACSEC_SA_ATTR_KEY] ||
1710 !attrs[MACSEC_SA_ATTR_KEYID])
1711 return false;
1712
1713 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1714 return false;
1715
1716 if (attrs[MACSEC_SA_ATTR_PN] &&
1717 nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1718 return false;
1719
1720 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1721 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1722 return false;
1723 }
1724
1725 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1726 return false;
1727
1728 return true;
1729}
1730
1731static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1732{
1733 struct net_device *dev;
1734 struct nlattr **attrs = info->attrs;
1735 struct macsec_secy *secy;
1736 struct macsec_rx_sc *rx_sc;
1737 struct macsec_rx_sa *rx_sa;
1738 unsigned char assoc_num;
1739 int pn_len;
1740 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1741 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1742 int err;
1743
1744 if (!attrs[MACSEC_ATTR_IFINDEX])
1745 return -EINVAL;
1746
1747 if (parse_sa_config(attrs, tb_sa))
1748 return -EINVAL;
1749
1750 if (parse_rxsc_config(attrs, tb_rxsc))
1751 return -EINVAL;
1752
1753 if (!validate_add_rxsa(tb_sa))
1754 return -EINVAL;
1755
1756 rtnl_lock();
1757 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1758 if (IS_ERR(rx_sc)) {
1759 rtnl_unlock();
1760 return PTR_ERR(rx_sc);
1761 }
1762
1763 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1764
1765 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1766 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1767 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1768 rtnl_unlock();
1769 return -EINVAL;
1770 }
1771
1772 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1773 if (tb_sa[MACSEC_SA_ATTR_PN] &&
1774 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1775 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
1776 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1777 rtnl_unlock();
1778 return -EINVAL;
1779 }
1780
1781 if (secy->xpn) {
1782 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
1783 rtnl_unlock();
1784 return -EINVAL;
1785 }
1786
1787 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
1788 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
1789 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
1790 MACSEC_SALT_LEN);
1791 rtnl_unlock();
1792 return -EINVAL;
1793 }
1794 }
1795
1796 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1797 if (rx_sa) {
1798 rtnl_unlock();
1799 return -EBUSY;
1800 }
1801
1802 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1803 if (!rx_sa) {
1804 rtnl_unlock();
1805 return -ENOMEM;
1806 }
1807
1808 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1809 secy->key_len, secy->icv_len);
1810 if (err < 0) {
1811 kfree(rx_sa);
1812 rtnl_unlock();
1813 return err;
1814 }
1815
1816 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1817 spin_lock_bh(&rx_sa->lock);
1818 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
1819 spin_unlock_bh(&rx_sa->lock);
1820 }
1821
1822 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1823 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1824
1825 rx_sa->sc = rx_sc;
1826
1827 if (secy->xpn) {
1828 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
1829 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
1830 MACSEC_SALT_LEN);
1831 }
1832
1833 /* If h/w offloading is available, propagate to the device */
1834 if (macsec_is_offloaded(netdev_priv(dev))) {
1835 const struct macsec_ops *ops;
1836 struct macsec_context ctx;
1837
1838 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1839 if (!ops) {
1840 err = -EOPNOTSUPP;
1841 goto cleanup;
1842 }
1843
1844 ctx.sa.assoc_num = assoc_num;
1845 ctx.sa.rx_sa = rx_sa;
1846 ctx.secy = secy;
1847 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1848 secy->key_len);
1849
1850 err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1851 memzero_explicit(ctx.sa.key, secy->key_len);
1852 if (err)
1853 goto cleanup;
1854 }
1855
1856 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1857 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1858
1859 rtnl_unlock();
1860
1861 return 0;
1862
1863cleanup:
1864 macsec_rxsa_put(rx_sa);
1865 rtnl_unlock();
1866 return err;
1867}
1868
1869static bool validate_add_rxsc(struct nlattr **attrs)
1870{
1871 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1872 return false;
1873
1874 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1875 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1876 return false;
1877 }
1878
1879 return true;
1880}
1881
1882static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1883{
1884 struct net_device *dev;
1885 sci_t sci = MACSEC_UNDEF_SCI;
1886 struct nlattr **attrs = info->attrs;
1887 struct macsec_rx_sc *rx_sc;
1888 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1889 struct macsec_secy *secy;
1890 bool active = true;
1891 int ret;
1892
1893 if (!attrs[MACSEC_ATTR_IFINDEX])
1894 return -EINVAL;
1895
1896 if (parse_rxsc_config(attrs, tb_rxsc))
1897 return -EINVAL;
1898
1899 if (!validate_add_rxsc(tb_rxsc))
1900 return -EINVAL;
1901
1902 rtnl_lock();
1903 dev = get_dev_from_nl(genl_info_net(info), attrs);
1904 if (IS_ERR(dev)) {
1905 rtnl_unlock();
1906 return PTR_ERR(dev);
1907 }
1908
1909 secy = &macsec_priv(dev)->secy;
1910 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1911
1912 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1913 active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1914
1915 rx_sc = create_rx_sc(dev, sci, active);
1916 if (IS_ERR(rx_sc)) {
1917 rtnl_unlock();
1918 return PTR_ERR(rx_sc);
1919 }
1920
1921 if (macsec_is_offloaded(netdev_priv(dev))) {
1922 const struct macsec_ops *ops;
1923 struct macsec_context ctx;
1924
1925 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1926 if (!ops) {
1927 ret = -EOPNOTSUPP;
1928 goto cleanup;
1929 }
1930
1931 ctx.rx_sc = rx_sc;
1932 ctx.secy = secy;
1933
1934 ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1935 if (ret)
1936 goto cleanup;
1937 }
1938
1939 rtnl_unlock();
1940
1941 return 0;
1942
1943cleanup:
1944 del_rx_sc(secy, sci);
1945 free_rx_sc(rx_sc);
1946 rtnl_unlock();
1947 return ret;
1948}
1949
1950static bool validate_add_txsa(struct nlattr **attrs)
1951{
1952 if (!attrs[MACSEC_SA_ATTR_AN] ||
1953 !attrs[MACSEC_SA_ATTR_PN] ||
1954 !attrs[MACSEC_SA_ATTR_KEY] ||
1955 !attrs[MACSEC_SA_ATTR_KEYID])
1956 return false;
1957
1958 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1959 return false;
1960
1961 if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1962 return false;
1963
1964 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1965 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1966 return false;
1967 }
1968
1969 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1970 return false;
1971
1972 return true;
1973}
1974
1975static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1976{
1977 struct net_device *dev;
1978 struct nlattr **attrs = info->attrs;
1979 struct macsec_secy *secy;
1980 struct macsec_tx_sc *tx_sc;
1981 struct macsec_tx_sa *tx_sa;
1982 unsigned char assoc_num;
1983 int pn_len;
1984 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1985 bool was_operational;
1986 int err;
1987
1988 if (!attrs[MACSEC_ATTR_IFINDEX])
1989 return -EINVAL;
1990
1991 if (parse_sa_config(attrs, tb_sa))
1992 return -EINVAL;
1993
1994 if (!validate_add_txsa(tb_sa))
1995 return -EINVAL;
1996
1997 rtnl_lock();
1998 dev = get_dev_from_nl(genl_info_net(info), attrs);
1999 if (IS_ERR(dev)) {
2000 rtnl_unlock();
2001 return PTR_ERR(dev);
2002 }
2003
2004 secy = &macsec_priv(dev)->secy;
2005 tx_sc = &secy->tx_sc;
2006
2007 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
2008
2009 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
2010 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
2011 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
2012 rtnl_unlock();
2013 return -EINVAL;
2014 }
2015
2016 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2017 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2018 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
2019 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2020 rtnl_unlock();
2021 return -EINVAL;
2022 }
2023
2024 if (secy->xpn) {
2025 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
2026 rtnl_unlock();
2027 return -EINVAL;
2028 }
2029
2030 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
2031 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
2032 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
2033 MACSEC_SALT_LEN);
2034 rtnl_unlock();
2035 return -EINVAL;
2036 }
2037 }
2038
2039 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
2040 if (tx_sa) {
2041 rtnl_unlock();
2042 return -EBUSY;
2043 }
2044
2045 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
2046 if (!tx_sa) {
2047 rtnl_unlock();
2048 return -ENOMEM;
2049 }
2050
2051 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2052 secy->key_len, secy->icv_len);
2053 if (err < 0) {
2054 kfree(tx_sa);
2055 rtnl_unlock();
2056 return err;
2057 }
2058
2059 spin_lock_bh(&tx_sa->lock);
2060 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2061 spin_unlock_bh(&tx_sa->lock);
2062
2063 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2064 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2065
2066 was_operational = secy->operational;
2067 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
2068 secy->operational = true;
2069
2070 if (secy->xpn) {
2071 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
2072 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
2073 MACSEC_SALT_LEN);
2074 }
2075
2076 /* If h/w offloading is available, propagate to the device */
2077 if (macsec_is_offloaded(netdev_priv(dev))) {
2078 const struct macsec_ops *ops;
2079 struct macsec_context ctx;
2080
2081 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2082 if (!ops) {
2083 err = -EOPNOTSUPP;
2084 goto cleanup;
2085 }
2086
2087 ctx.sa.assoc_num = assoc_num;
2088 ctx.sa.tx_sa = tx_sa;
2089 ctx.secy = secy;
2090 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2091 secy->key_len);
2092
2093 err = macsec_offload(ops->mdo_add_txsa, &ctx);
2094 memzero_explicit(ctx.sa.key, secy->key_len);
2095 if (err)
2096 goto cleanup;
2097 }
2098
2099 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
2100 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
2101
2102 rtnl_unlock();
2103
2104 return 0;
2105
2106cleanup:
2107 secy->operational = was_operational;
2108 macsec_txsa_put(tx_sa);
2109 rtnl_unlock();
2110 return err;
2111}
2112
2113static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
2114{
2115 struct nlattr **attrs = info->attrs;
2116 struct net_device *dev;
2117 struct macsec_secy *secy;
2118 struct macsec_rx_sc *rx_sc;
2119 struct macsec_rx_sa *rx_sa;
2120 u8 assoc_num;
2121 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2122 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2123 int ret;
2124
2125 if (!attrs[MACSEC_ATTR_IFINDEX])
2126 return -EINVAL;
2127
2128 if (parse_sa_config(attrs, tb_sa))
2129 return -EINVAL;
2130
2131 if (parse_rxsc_config(attrs, tb_rxsc))
2132 return -EINVAL;
2133
2134 rtnl_lock();
2135 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2136 &dev, &secy, &rx_sc, &assoc_num);
2137 if (IS_ERR(rx_sa)) {
2138 rtnl_unlock();
2139 return PTR_ERR(rx_sa);
2140 }
2141
2142 if (rx_sa->active) {
2143 rtnl_unlock();
2144 return -EBUSY;
2145 }
2146
2147 /* If h/w offloading is available, propagate to the device */
2148 if (macsec_is_offloaded(netdev_priv(dev))) {
2149 const struct macsec_ops *ops;
2150 struct macsec_context ctx;
2151
2152 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2153 if (!ops) {
2154 ret = -EOPNOTSUPP;
2155 goto cleanup;
2156 }
2157
2158 ctx.sa.assoc_num = assoc_num;
2159 ctx.sa.rx_sa = rx_sa;
2160 ctx.secy = secy;
2161
2162 ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
2163 if (ret)
2164 goto cleanup;
2165 }
2166
2167 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
2168 clear_rx_sa(rx_sa);
2169
2170 rtnl_unlock();
2171
2172 return 0;
2173
2174cleanup:
2175 rtnl_unlock();
2176 return ret;
2177}
2178
2179static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
2180{
2181 struct nlattr **attrs = info->attrs;
2182 struct net_device *dev;
2183 struct macsec_secy *secy;
2184 struct macsec_rx_sc *rx_sc;
2185 sci_t sci;
2186 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2187 int ret;
2188
2189 if (!attrs[MACSEC_ATTR_IFINDEX])
2190 return -EINVAL;
2191
2192 if (parse_rxsc_config(attrs, tb_rxsc))
2193 return -EINVAL;
2194
2195 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
2196 return -EINVAL;
2197
2198 rtnl_lock();
2199 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2200 if (IS_ERR(dev)) {
2201 rtnl_unlock();
2202 return PTR_ERR(dev);
2203 }
2204
2205 secy = &macsec_priv(dev)->secy;
2206 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2207
2208 rx_sc = del_rx_sc(secy, sci);
2209 if (!rx_sc) {
2210 rtnl_unlock();
2211 return -ENODEV;
2212 }
2213
2214 /* If h/w offloading is available, propagate to the device */
2215 if (macsec_is_offloaded(netdev_priv(dev))) {
2216 const struct macsec_ops *ops;
2217 struct macsec_context ctx;
2218
2219 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2220 if (!ops) {
2221 ret = -EOPNOTSUPP;
2222 goto cleanup;
2223 }
2224
2225 ctx.rx_sc = rx_sc;
2226 ctx.secy = secy;
2227 ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2228 if (ret)
2229 goto cleanup;
2230 }
2231
2232 free_rx_sc(rx_sc);
2233 rtnl_unlock();
2234
2235 return 0;
2236
2237cleanup:
2238 rtnl_unlock();
2239 return ret;
2240}
2241
2242static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2243{
2244 struct nlattr **attrs = info->attrs;
2245 struct net_device *dev;
2246 struct macsec_secy *secy;
2247 struct macsec_tx_sc *tx_sc;
2248 struct macsec_tx_sa *tx_sa;
2249 u8 assoc_num;
2250 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2251 int ret;
2252
2253 if (!attrs[MACSEC_ATTR_IFINDEX])
2254 return -EINVAL;
2255
2256 if (parse_sa_config(attrs, tb_sa))
2257 return -EINVAL;
2258
2259 rtnl_lock();
2260 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2261 &dev, &secy, &tx_sc, &assoc_num);
2262 if (IS_ERR(tx_sa)) {
2263 rtnl_unlock();
2264 return PTR_ERR(tx_sa);
2265 }
2266
2267 if (tx_sa->active) {
2268 rtnl_unlock();
2269 return -EBUSY;
2270 }
2271
2272 /* If h/w offloading is available, propagate to the device */
2273 if (macsec_is_offloaded(netdev_priv(dev))) {
2274 const struct macsec_ops *ops;
2275 struct macsec_context ctx;
2276
2277 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2278 if (!ops) {
2279 ret = -EOPNOTSUPP;
2280 goto cleanup;
2281 }
2282
2283 ctx.sa.assoc_num = assoc_num;
2284 ctx.sa.tx_sa = tx_sa;
2285 ctx.secy = secy;
2286
2287 ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2288 if (ret)
2289 goto cleanup;
2290 }
2291
2292 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2293 clear_tx_sa(tx_sa);
2294
2295 rtnl_unlock();
2296
2297 return 0;
2298
2299cleanup:
2300 rtnl_unlock();
2301 return ret;
2302}
2303
2304static bool validate_upd_sa(struct nlattr **attrs)
2305{
2306 if (!attrs[MACSEC_SA_ATTR_AN] ||
2307 attrs[MACSEC_SA_ATTR_KEY] ||
2308 attrs[MACSEC_SA_ATTR_KEYID] ||
2309 attrs[MACSEC_SA_ATTR_SSCI] ||
2310 attrs[MACSEC_SA_ATTR_SALT])
2311 return false;
2312
2313 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2314 return false;
2315
2316 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
2317 return false;
2318
2319 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2320 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2321 return false;
2322 }
2323
2324 return true;
2325}
2326
2327static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2328{
2329 struct nlattr **attrs = info->attrs;
2330 struct net_device *dev;
2331 struct macsec_secy *secy;
2332 struct macsec_tx_sc *tx_sc;
2333 struct macsec_tx_sa *tx_sa;
2334 u8 assoc_num;
2335 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2336 bool was_operational, was_active;
2337 pn_t prev_pn;
2338 int ret = 0;
2339
2340 prev_pn.full64 = 0;
2341
2342 if (!attrs[MACSEC_ATTR_IFINDEX])
2343 return -EINVAL;
2344
2345 if (parse_sa_config(attrs, tb_sa))
2346 return -EINVAL;
2347
2348 if (!validate_upd_sa(tb_sa))
2349 return -EINVAL;
2350
2351 rtnl_lock();
2352 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2353 &dev, &secy, &tx_sc, &assoc_num);
2354 if (IS_ERR(tx_sa)) {
2355 rtnl_unlock();
2356 return PTR_ERR(tx_sa);
2357 }
2358
2359 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2360 int pn_len;
2361
2362 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2363 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2364 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
2365 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2366 rtnl_unlock();
2367 return -EINVAL;
2368 }
2369
2370 spin_lock_bh(&tx_sa->lock);
2371 prev_pn = tx_sa->next_pn_halves;
2372 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2373 spin_unlock_bh(&tx_sa->lock);
2374 }
2375
2376 was_active = tx_sa->active;
2377 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2378 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2379
2380 was_operational = secy->operational;
2381 if (assoc_num == tx_sc->encoding_sa)
2382 secy->operational = tx_sa->active;
2383
2384 /* If h/w offloading is available, propagate to the device */
2385 if (macsec_is_offloaded(netdev_priv(dev))) {
2386 const struct macsec_ops *ops;
2387 struct macsec_context ctx;
2388
2389 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2390 if (!ops) {
2391 ret = -EOPNOTSUPP;
2392 goto cleanup;
2393 }
2394
2395 ctx.sa.assoc_num = assoc_num;
2396 ctx.sa.tx_sa = tx_sa;
2397 ctx.sa.update_pn = !!prev_pn.full64;
2398 ctx.secy = secy;
2399
2400 ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
2401 if (ret)
2402 goto cleanup;
2403 }
2404
2405 rtnl_unlock();
2406
2407 return 0;
2408
2409cleanup:
2410 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2411 spin_lock_bh(&tx_sa->lock);
2412 tx_sa->next_pn_halves = prev_pn;
2413 spin_unlock_bh(&tx_sa->lock);
2414 }
2415 tx_sa->active = was_active;
2416 secy->operational = was_operational;
2417 rtnl_unlock();
2418 return ret;
2419}
2420
2421static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2422{
2423 struct nlattr **attrs = info->attrs;
2424 struct net_device *dev;
2425 struct macsec_secy *secy;
2426 struct macsec_rx_sc *rx_sc;
2427 struct macsec_rx_sa *rx_sa;
2428 u8 assoc_num;
2429 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2430 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2431 bool was_active;
2432 pn_t prev_pn;
2433 int ret = 0;
2434
2435 prev_pn.full64 = 0;
2436
2437 if (!attrs[MACSEC_ATTR_IFINDEX])
2438 return -EINVAL;
2439
2440 if (parse_rxsc_config(attrs, tb_rxsc))
2441 return -EINVAL;
2442
2443 if (parse_sa_config(attrs, tb_sa))
2444 return -EINVAL;
2445
2446 if (!validate_upd_sa(tb_sa))
2447 return -EINVAL;
2448
2449 rtnl_lock();
2450 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2451 &dev, &secy, &rx_sc, &assoc_num);
2452 if (IS_ERR(rx_sa)) {
2453 rtnl_unlock();
2454 return PTR_ERR(rx_sa);
2455 }
2456
2457 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2458 int pn_len;
2459
2460 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2461 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2462 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
2463 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2464 rtnl_unlock();
2465 return -EINVAL;
2466 }
2467
2468 spin_lock_bh(&rx_sa->lock);
2469 prev_pn = rx_sa->next_pn_halves;
2470 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2471 spin_unlock_bh(&rx_sa->lock);
2472 }
2473
2474 was_active = rx_sa->active;
2475 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2476 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2477
2478 /* If h/w offloading is available, propagate to the device */
2479 if (macsec_is_offloaded(netdev_priv(dev))) {
2480 const struct macsec_ops *ops;
2481 struct macsec_context ctx;
2482
2483 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2484 if (!ops) {
2485 ret = -EOPNOTSUPP;
2486 goto cleanup;
2487 }
2488
2489 ctx.sa.assoc_num = assoc_num;
2490 ctx.sa.rx_sa = rx_sa;
2491 ctx.sa.update_pn = !!prev_pn.full64;
2492 ctx.secy = secy;
2493
2494 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2495 if (ret)
2496 goto cleanup;
2497 }
2498
2499 rtnl_unlock();
2500 return 0;
2501
2502cleanup:
2503 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2504 spin_lock_bh(&rx_sa->lock);
2505 rx_sa->next_pn_halves = prev_pn;
2506 spin_unlock_bh(&rx_sa->lock);
2507 }
2508 rx_sa->active = was_active;
2509 rtnl_unlock();
2510 return ret;
2511}
2512
2513static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2514{
2515 struct nlattr **attrs = info->attrs;
2516 struct net_device *dev;
2517 struct macsec_secy *secy;
2518 struct macsec_rx_sc *rx_sc;
2519 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2520 unsigned int prev_n_rx_sc;
2521 bool was_active;
2522 int ret;
2523
2524 if (!attrs[MACSEC_ATTR_IFINDEX])
2525 return -EINVAL;
2526
2527 if (parse_rxsc_config(attrs, tb_rxsc))
2528 return -EINVAL;
2529
2530 if (!validate_add_rxsc(tb_rxsc))
2531 return -EINVAL;
2532
2533 rtnl_lock();
2534 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2535 if (IS_ERR(rx_sc)) {
2536 rtnl_unlock();
2537 return PTR_ERR(rx_sc);
2538 }
2539
2540 was_active = rx_sc->active;
2541 prev_n_rx_sc = secy->n_rx_sc;
2542 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2543 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2544
2545 if (rx_sc->active != new)
2546 secy->n_rx_sc += new ? 1 : -1;
2547
2548 rx_sc->active = new;
2549 }
2550
2551 /* If h/w offloading is available, propagate to the device */
2552 if (macsec_is_offloaded(netdev_priv(dev))) {
2553 const struct macsec_ops *ops;
2554 struct macsec_context ctx;
2555
2556 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2557 if (!ops) {
2558 ret = -EOPNOTSUPP;
2559 goto cleanup;
2560 }
2561
2562 ctx.rx_sc = rx_sc;
2563 ctx.secy = secy;
2564
2565 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2566 if (ret)
2567 goto cleanup;
2568 }
2569
2570 rtnl_unlock();
2571
2572 return 0;
2573
2574cleanup:
2575 secy->n_rx_sc = prev_n_rx_sc;
2576 rx_sc->active = was_active;
2577 rtnl_unlock();
2578 return ret;
2579}
2580
2581static bool macsec_is_configured(struct macsec_dev *macsec)
2582{
2583 struct macsec_secy *secy = &macsec->secy;
2584 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2585 int i;
2586
2587 if (secy->rx_sc)
2588 return true;
2589
2590 for (i = 0; i < MACSEC_NUM_AN; i++)
2591 if (tx_sc->sa[i])
2592 return true;
2593
2594 return false;
2595}
2596
2597static bool macsec_needs_tx_tag(struct macsec_dev *macsec,
2598 const struct macsec_ops *ops)
2599{
2600 return macsec->offload == MACSEC_OFFLOAD_PHY &&
2601 ops->mdo_insert_tx_tag;
2602}
2603
2604static void macsec_set_head_tail_room(struct net_device *dev)
2605{
2606 struct macsec_dev *macsec = macsec_priv(dev);
2607 struct net_device *real_dev = macsec->real_dev;
2608 int needed_headroom, needed_tailroom;
2609 const struct macsec_ops *ops;
2610
2611 ops = macsec_get_ops(macsec, NULL);
2612 if (ops) {
2613 needed_headroom = ops->needed_headroom;
2614 needed_tailroom = ops->needed_tailroom;
2615 } else {
2616 needed_headroom = MACSEC_NEEDED_HEADROOM;
2617 needed_tailroom = MACSEC_NEEDED_TAILROOM;
2618 }
2619
2620 dev->needed_headroom = real_dev->needed_headroom + needed_headroom;
2621 dev->needed_tailroom = real_dev->needed_tailroom + needed_tailroom;
2622}
2623
2624static void macsec_inherit_tso_max(struct net_device *dev)
2625{
2626 struct macsec_dev *macsec = macsec_priv(dev);
2627
2628 /* if macsec is offloaded, we need to follow the lower
2629 * device's capabilities. otherwise, we can ignore them.
2630 */
2631 if (macsec_is_offloaded(macsec))
2632 netif_inherit_tso_max(dev, macsec->real_dev);
2633}
2634
2635static int macsec_update_offload(struct net_device *dev, enum macsec_offload offload)
2636{
2637 enum macsec_offload prev_offload;
2638 const struct macsec_ops *ops;
2639 struct macsec_context ctx;
2640 struct macsec_dev *macsec;
2641 int ret = 0;
2642
2643 macsec = macsec_priv(dev);
2644
2645 /* Check if the offloading mode is supported by the underlying layers */
2646 if (offload != MACSEC_OFFLOAD_OFF &&
2647 !macsec_check_offload(offload, macsec))
2648 return -EOPNOTSUPP;
2649
2650 /* Check if the net device is busy. */
2651 if (netif_running(dev))
2652 return -EBUSY;
2653
2654 /* Check if the device already has rules configured: we do not support
2655 * rules migration.
2656 */
2657 if (macsec_is_configured(macsec))
2658 return -EBUSY;
2659
2660 prev_offload = macsec->offload;
2661
2662 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2663 macsec, &ctx);
2664 if (!ops)
2665 return -EOPNOTSUPP;
2666
2667 macsec->offload = offload;
2668
2669 ctx.secy = &macsec->secy;
2670 ret = offload == MACSEC_OFFLOAD_OFF ? macsec_offload(ops->mdo_del_secy, &ctx)
2671 : macsec_offload(ops->mdo_add_secy, &ctx);
2672 if (ret) {
2673 macsec->offload = prev_offload;
2674 return ret;
2675 }
2676
2677 macsec_set_head_tail_room(dev);
2678 macsec->insert_tx_tag = macsec_needs_tx_tag(macsec, ops);
2679
2680 macsec_inherit_tso_max(dev);
2681
2682 netdev_update_features(dev);
2683
2684 return ret;
2685}
2686
2687static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2688{
2689 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2690 struct nlattr **attrs = info->attrs;
2691 enum macsec_offload offload;
2692 struct macsec_dev *macsec;
2693 struct net_device *dev;
2694 int ret = 0;
2695
2696 if (!attrs[MACSEC_ATTR_IFINDEX])
2697 return -EINVAL;
2698
2699 if (!attrs[MACSEC_ATTR_OFFLOAD])
2700 return -EINVAL;
2701
2702 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2703 attrs[MACSEC_ATTR_OFFLOAD],
2704 macsec_genl_offload_policy, NULL))
2705 return -EINVAL;
2706
2707 rtnl_lock();
2708
2709 dev = get_dev_from_nl(genl_info_net(info), attrs);
2710 if (IS_ERR(dev)) {
2711 ret = PTR_ERR(dev);
2712 goto out;
2713 }
2714 macsec = macsec_priv(dev);
2715
2716 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) {
2717 ret = -EINVAL;
2718 goto out;
2719 }
2720
2721 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2722
2723 if (macsec->offload != offload)
2724 ret = macsec_update_offload(dev, offload);
2725out:
2726 rtnl_unlock();
2727 return ret;
2728}
2729
2730static void get_tx_sa_stats(struct net_device *dev, int an,
2731 struct macsec_tx_sa *tx_sa,
2732 struct macsec_tx_sa_stats *sum)
2733{
2734 struct macsec_dev *macsec = macsec_priv(dev);
2735 int cpu;
2736
2737 /* If h/w offloading is available, propagate to the device */
2738 if (macsec_is_offloaded(macsec)) {
2739 const struct macsec_ops *ops;
2740 struct macsec_context ctx;
2741
2742 ops = macsec_get_ops(macsec, &ctx);
2743 if (ops) {
2744 ctx.sa.assoc_num = an;
2745 ctx.sa.tx_sa = tx_sa;
2746 ctx.stats.tx_sa_stats = sum;
2747 ctx.secy = &macsec_priv(dev)->secy;
2748 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
2749 }
2750 return;
2751 }
2752
2753 for_each_possible_cpu(cpu) {
2754 const struct macsec_tx_sa_stats *stats =
2755 per_cpu_ptr(tx_sa->stats, cpu);
2756
2757 sum->OutPktsProtected += stats->OutPktsProtected;
2758 sum->OutPktsEncrypted += stats->OutPktsEncrypted;
2759 }
2760}
2761
2762static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
2763{
2764 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
2765 sum->OutPktsProtected) ||
2766 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2767 sum->OutPktsEncrypted))
2768 return -EMSGSIZE;
2769
2770 return 0;
2771}
2772
2773static void get_rx_sa_stats(struct net_device *dev,
2774 struct macsec_rx_sc *rx_sc, int an,
2775 struct macsec_rx_sa *rx_sa,
2776 struct macsec_rx_sa_stats *sum)
2777{
2778 struct macsec_dev *macsec = macsec_priv(dev);
2779 int cpu;
2780
2781 /* If h/w offloading is available, propagate to the device */
2782 if (macsec_is_offloaded(macsec)) {
2783 const struct macsec_ops *ops;
2784 struct macsec_context ctx;
2785
2786 ops = macsec_get_ops(macsec, &ctx);
2787 if (ops) {
2788 ctx.sa.assoc_num = an;
2789 ctx.sa.rx_sa = rx_sa;
2790 ctx.stats.rx_sa_stats = sum;
2791 ctx.secy = &macsec_priv(dev)->secy;
2792 ctx.rx_sc = rx_sc;
2793 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
2794 }
2795 return;
2796 }
2797
2798 for_each_possible_cpu(cpu) {
2799 const struct macsec_rx_sa_stats *stats =
2800 per_cpu_ptr(rx_sa->stats, cpu);
2801
2802 sum->InPktsOK += stats->InPktsOK;
2803 sum->InPktsInvalid += stats->InPktsInvalid;
2804 sum->InPktsNotValid += stats->InPktsNotValid;
2805 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
2806 sum->InPktsUnusedSA += stats->InPktsUnusedSA;
2807 }
2808}
2809
2810static int copy_rx_sa_stats(struct sk_buff *skb,
2811 struct macsec_rx_sa_stats *sum)
2812{
2813 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
2814 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
2815 sum->InPktsInvalid) ||
2816 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
2817 sum->InPktsNotValid) ||
2818 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2819 sum->InPktsNotUsingSA) ||
2820 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
2821 sum->InPktsUnusedSA))
2822 return -EMSGSIZE;
2823
2824 return 0;
2825}
2826
2827static void get_rx_sc_stats(struct net_device *dev,
2828 struct macsec_rx_sc *rx_sc,
2829 struct macsec_rx_sc_stats *sum)
2830{
2831 struct macsec_dev *macsec = macsec_priv(dev);
2832 int cpu;
2833
2834 /* If h/w offloading is available, propagate to the device */
2835 if (macsec_is_offloaded(macsec)) {
2836 const struct macsec_ops *ops;
2837 struct macsec_context ctx;
2838
2839 ops = macsec_get_ops(macsec, &ctx);
2840 if (ops) {
2841 ctx.stats.rx_sc_stats = sum;
2842 ctx.secy = &macsec_priv(dev)->secy;
2843 ctx.rx_sc = rx_sc;
2844 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
2845 }
2846 return;
2847 }
2848
2849 for_each_possible_cpu(cpu) {
2850 const struct pcpu_rx_sc_stats *stats;
2851 struct macsec_rx_sc_stats tmp;
2852 unsigned int start;
2853
2854 stats = per_cpu_ptr(rx_sc->stats, cpu);
2855 do {
2856 start = u64_stats_fetch_begin(&stats->syncp);
2857 memcpy(&tmp, &stats->stats, sizeof(tmp));
2858 } while (u64_stats_fetch_retry(&stats->syncp, start));
2859
2860 sum->InOctetsValidated += tmp.InOctetsValidated;
2861 sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
2862 sum->InPktsUnchecked += tmp.InPktsUnchecked;
2863 sum->InPktsDelayed += tmp.InPktsDelayed;
2864 sum->InPktsOK += tmp.InPktsOK;
2865 sum->InPktsInvalid += tmp.InPktsInvalid;
2866 sum->InPktsLate += tmp.InPktsLate;
2867 sum->InPktsNotValid += tmp.InPktsNotValid;
2868 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2869 sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
2870 }
2871}
2872
2873static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
2874{
2875 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2876 sum->InOctetsValidated,
2877 MACSEC_RXSC_STATS_ATTR_PAD) ||
2878 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2879 sum->InOctetsDecrypted,
2880 MACSEC_RXSC_STATS_ATTR_PAD) ||
2881 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2882 sum->InPktsUnchecked,
2883 MACSEC_RXSC_STATS_ATTR_PAD) ||
2884 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2885 sum->InPktsDelayed,
2886 MACSEC_RXSC_STATS_ATTR_PAD) ||
2887 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2888 sum->InPktsOK,
2889 MACSEC_RXSC_STATS_ATTR_PAD) ||
2890 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2891 sum->InPktsInvalid,
2892 MACSEC_RXSC_STATS_ATTR_PAD) ||
2893 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2894 sum->InPktsLate,
2895 MACSEC_RXSC_STATS_ATTR_PAD) ||
2896 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2897 sum->InPktsNotValid,
2898 MACSEC_RXSC_STATS_ATTR_PAD) ||
2899 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2900 sum->InPktsNotUsingSA,
2901 MACSEC_RXSC_STATS_ATTR_PAD) ||
2902 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2903 sum->InPktsUnusedSA,
2904 MACSEC_RXSC_STATS_ATTR_PAD))
2905 return -EMSGSIZE;
2906
2907 return 0;
2908}
2909
2910static void get_tx_sc_stats(struct net_device *dev,
2911 struct macsec_tx_sc_stats *sum)
2912{
2913 struct macsec_dev *macsec = macsec_priv(dev);
2914 int cpu;
2915
2916 /* If h/w offloading is available, propagate to the device */
2917 if (macsec_is_offloaded(macsec)) {
2918 const struct macsec_ops *ops;
2919 struct macsec_context ctx;
2920
2921 ops = macsec_get_ops(macsec, &ctx);
2922 if (ops) {
2923 ctx.stats.tx_sc_stats = sum;
2924 ctx.secy = &macsec_priv(dev)->secy;
2925 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
2926 }
2927 return;
2928 }
2929
2930 for_each_possible_cpu(cpu) {
2931 const struct pcpu_tx_sc_stats *stats;
2932 struct macsec_tx_sc_stats tmp;
2933 unsigned int start;
2934
2935 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
2936 do {
2937 start = u64_stats_fetch_begin(&stats->syncp);
2938 memcpy(&tmp, &stats->stats, sizeof(tmp));
2939 } while (u64_stats_fetch_retry(&stats->syncp, start));
2940
2941 sum->OutPktsProtected += tmp.OutPktsProtected;
2942 sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
2943 sum->OutOctetsProtected += tmp.OutOctetsProtected;
2944 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2945 }
2946}
2947
2948static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
2949{
2950 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2951 sum->OutPktsProtected,
2952 MACSEC_TXSC_STATS_ATTR_PAD) ||
2953 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2954 sum->OutPktsEncrypted,
2955 MACSEC_TXSC_STATS_ATTR_PAD) ||
2956 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2957 sum->OutOctetsProtected,
2958 MACSEC_TXSC_STATS_ATTR_PAD) ||
2959 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2960 sum->OutOctetsEncrypted,
2961 MACSEC_TXSC_STATS_ATTR_PAD))
2962 return -EMSGSIZE;
2963
2964 return 0;
2965}
2966
2967static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
2968{
2969 struct macsec_dev *macsec = macsec_priv(dev);
2970 int cpu;
2971
2972 /* If h/w offloading is available, propagate to the device */
2973 if (macsec_is_offloaded(macsec)) {
2974 const struct macsec_ops *ops;
2975 struct macsec_context ctx;
2976
2977 ops = macsec_get_ops(macsec, &ctx);
2978 if (ops) {
2979 ctx.stats.dev_stats = sum;
2980 ctx.secy = &macsec_priv(dev)->secy;
2981 macsec_offload(ops->mdo_get_dev_stats, &ctx);
2982 }
2983 return;
2984 }
2985
2986 for_each_possible_cpu(cpu) {
2987 const struct pcpu_secy_stats *stats;
2988 struct macsec_dev_stats tmp;
2989 unsigned int start;
2990
2991 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
2992 do {
2993 start = u64_stats_fetch_begin(&stats->syncp);
2994 memcpy(&tmp, &stats->stats, sizeof(tmp));
2995 } while (u64_stats_fetch_retry(&stats->syncp, start));
2996
2997 sum->OutPktsUntagged += tmp.OutPktsUntagged;
2998 sum->InPktsUntagged += tmp.InPktsUntagged;
2999 sum->OutPktsTooLong += tmp.OutPktsTooLong;
3000 sum->InPktsNoTag += tmp.InPktsNoTag;
3001 sum->InPktsBadTag += tmp.InPktsBadTag;
3002 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
3003 sum->InPktsNoSCI += tmp.InPktsNoSCI;
3004 sum->InPktsOverrun += tmp.InPktsOverrun;
3005 }
3006}
3007
3008static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
3009{
3010 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
3011 sum->OutPktsUntagged,
3012 MACSEC_SECY_STATS_ATTR_PAD) ||
3013 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
3014 sum->InPktsUntagged,
3015 MACSEC_SECY_STATS_ATTR_PAD) ||
3016 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
3017 sum->OutPktsTooLong,
3018 MACSEC_SECY_STATS_ATTR_PAD) ||
3019 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
3020 sum->InPktsNoTag,
3021 MACSEC_SECY_STATS_ATTR_PAD) ||
3022 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
3023 sum->InPktsBadTag,
3024 MACSEC_SECY_STATS_ATTR_PAD) ||
3025 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
3026 sum->InPktsUnknownSCI,
3027 MACSEC_SECY_STATS_ATTR_PAD) ||
3028 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
3029 sum->InPktsNoSCI,
3030 MACSEC_SECY_STATS_ATTR_PAD) ||
3031 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
3032 sum->InPktsOverrun,
3033 MACSEC_SECY_STATS_ATTR_PAD))
3034 return -EMSGSIZE;
3035
3036 return 0;
3037}
3038
3039static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
3040{
3041 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3042 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
3043 MACSEC_ATTR_SECY);
3044 u64 csid;
3045
3046 if (!secy_nest)
3047 return 1;
3048
3049 switch (secy->key_len) {
3050 case MACSEC_GCM_AES_128_SAK_LEN:
3051 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
3052 break;
3053 case MACSEC_GCM_AES_256_SAK_LEN:
3054 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
3055 break;
3056 default:
3057 goto cancel;
3058 }
3059
3060 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
3061 MACSEC_SECY_ATTR_PAD) ||
3062 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
3063 csid, MACSEC_SECY_ATTR_PAD) ||
3064 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
3065 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
3066 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
3067 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
3068 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
3069 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
3070 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
3071 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
3072 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
3073 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
3074 goto cancel;
3075
3076 if (secy->replay_protect) {
3077 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
3078 goto cancel;
3079 }
3080
3081 nla_nest_end(skb, secy_nest);
3082 return 0;
3083
3084cancel:
3085 nla_nest_cancel(skb, secy_nest);
3086 return 1;
3087}
3088
3089static noinline_for_stack int
3090dump_secy(struct macsec_secy *secy, struct net_device *dev,
3091 struct sk_buff *skb, struct netlink_callback *cb)
3092{
3093 struct macsec_tx_sc_stats tx_sc_stats = {0, };
3094 struct macsec_tx_sa_stats tx_sa_stats = {0, };
3095 struct macsec_rx_sc_stats rx_sc_stats = {0, };
3096 struct macsec_rx_sa_stats rx_sa_stats = {0, };
3097 struct macsec_dev *macsec = netdev_priv(dev);
3098 struct macsec_dev_stats dev_stats = {0, };
3099 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3100 struct nlattr *txsa_list, *rxsc_list;
3101 struct macsec_rx_sc *rx_sc;
3102 struct nlattr *attr;
3103 void *hdr;
3104 int i, j;
3105
3106 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3107 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
3108 if (!hdr)
3109 return -EMSGSIZE;
3110
3111 genl_dump_check_consistent(cb, hdr);
3112
3113 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
3114 goto nla_put_failure;
3115
3116 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
3117 if (!attr)
3118 goto nla_put_failure;
3119 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
3120 goto nla_put_failure;
3121 nla_nest_end(skb, attr);
3122
3123 if (nla_put_secy(secy, skb))
3124 goto nla_put_failure;
3125
3126 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
3127 if (!attr)
3128 goto nla_put_failure;
3129
3130 get_tx_sc_stats(dev, &tx_sc_stats);
3131 if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
3132 nla_nest_cancel(skb, attr);
3133 goto nla_put_failure;
3134 }
3135 nla_nest_end(skb, attr);
3136
3137 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
3138 if (!attr)
3139 goto nla_put_failure;
3140 get_secy_stats(dev, &dev_stats);
3141 if (copy_secy_stats(skb, &dev_stats)) {
3142 nla_nest_cancel(skb, attr);
3143 goto nla_put_failure;
3144 }
3145 nla_nest_end(skb, attr);
3146
3147 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
3148 if (!txsa_list)
3149 goto nla_put_failure;
3150 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
3151 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
3152 struct nlattr *txsa_nest;
3153 u64 pn;
3154 int pn_len;
3155
3156 if (!tx_sa)
3157 continue;
3158
3159 txsa_nest = nla_nest_start_noflag(skb, j++);
3160 if (!txsa_nest) {
3161 nla_nest_cancel(skb, txsa_list);
3162 goto nla_put_failure;
3163 }
3164
3165 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
3166 if (!attr) {
3167 nla_nest_cancel(skb, txsa_nest);
3168 nla_nest_cancel(skb, txsa_list);
3169 goto nla_put_failure;
3170 }
3171 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
3172 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
3173 if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
3174 nla_nest_cancel(skb, attr);
3175 nla_nest_cancel(skb, txsa_nest);
3176 nla_nest_cancel(skb, txsa_list);
3177 goto nla_put_failure;
3178 }
3179 nla_nest_end(skb, attr);
3180
3181 if (secy->xpn) {
3182 pn = tx_sa->next_pn;
3183 pn_len = MACSEC_XPN_PN_LEN;
3184 } else {
3185 pn = tx_sa->next_pn_halves.lower;
3186 pn_len = MACSEC_DEFAULT_PN_LEN;
3187 }
3188
3189 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3190 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3191 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
3192 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
3193 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
3194 nla_nest_cancel(skb, txsa_nest);
3195 nla_nest_cancel(skb, txsa_list);
3196 goto nla_put_failure;
3197 }
3198
3199 nla_nest_end(skb, txsa_nest);
3200 }
3201 nla_nest_end(skb, txsa_list);
3202
3203 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
3204 if (!rxsc_list)
3205 goto nla_put_failure;
3206
3207 j = 1;
3208 for_each_rxsc_rtnl(secy, rx_sc) {
3209 int k;
3210 struct nlattr *rxsa_list;
3211 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
3212
3213 if (!rxsc_nest) {
3214 nla_nest_cancel(skb, rxsc_list);
3215 goto nla_put_failure;
3216 }
3217
3218 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
3219 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
3220 MACSEC_RXSC_ATTR_PAD)) {
3221 nla_nest_cancel(skb, rxsc_nest);
3222 nla_nest_cancel(skb, rxsc_list);
3223 goto nla_put_failure;
3224 }
3225
3226 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
3227 if (!attr) {
3228 nla_nest_cancel(skb, rxsc_nest);
3229 nla_nest_cancel(skb, rxsc_list);
3230 goto nla_put_failure;
3231 }
3232 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
3233 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
3234 if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
3235 nla_nest_cancel(skb, attr);
3236 nla_nest_cancel(skb, rxsc_nest);
3237 nla_nest_cancel(skb, rxsc_list);
3238 goto nla_put_failure;
3239 }
3240 nla_nest_end(skb, attr);
3241
3242 rxsa_list = nla_nest_start_noflag(skb,
3243 MACSEC_RXSC_ATTR_SA_LIST);
3244 if (!rxsa_list) {
3245 nla_nest_cancel(skb, rxsc_nest);
3246 nla_nest_cancel(skb, rxsc_list);
3247 goto nla_put_failure;
3248 }
3249
3250 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
3251 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
3252 struct nlattr *rxsa_nest;
3253 u64 pn;
3254 int pn_len;
3255
3256 if (!rx_sa)
3257 continue;
3258
3259 rxsa_nest = nla_nest_start_noflag(skb, k++);
3260 if (!rxsa_nest) {
3261 nla_nest_cancel(skb, rxsa_list);
3262 nla_nest_cancel(skb, rxsc_nest);
3263 nla_nest_cancel(skb, rxsc_list);
3264 goto nla_put_failure;
3265 }
3266
3267 attr = nla_nest_start_noflag(skb,
3268 MACSEC_SA_ATTR_STATS);
3269 if (!attr) {
3270 nla_nest_cancel(skb, rxsa_list);
3271 nla_nest_cancel(skb, rxsc_nest);
3272 nla_nest_cancel(skb, rxsc_list);
3273 goto nla_put_failure;
3274 }
3275 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
3276 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
3277 if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
3278 nla_nest_cancel(skb, attr);
3279 nla_nest_cancel(skb, rxsa_list);
3280 nla_nest_cancel(skb, rxsc_nest);
3281 nla_nest_cancel(skb, rxsc_list);
3282 goto nla_put_failure;
3283 }
3284 nla_nest_end(skb, attr);
3285
3286 if (secy->xpn) {
3287 pn = rx_sa->next_pn;
3288 pn_len = MACSEC_XPN_PN_LEN;
3289 } else {
3290 pn = rx_sa->next_pn_halves.lower;
3291 pn_len = MACSEC_DEFAULT_PN_LEN;
3292 }
3293
3294 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3295 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3296 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
3297 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
3298 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
3299 nla_nest_cancel(skb, rxsa_nest);
3300 nla_nest_cancel(skb, rxsc_nest);
3301 nla_nest_cancel(skb, rxsc_list);
3302 goto nla_put_failure;
3303 }
3304 nla_nest_end(skb, rxsa_nest);
3305 }
3306
3307 nla_nest_end(skb, rxsa_list);
3308 nla_nest_end(skb, rxsc_nest);
3309 }
3310
3311 nla_nest_end(skb, rxsc_list);
3312
3313 genlmsg_end(skb, hdr);
3314
3315 return 0;
3316
3317nla_put_failure:
3318 genlmsg_cancel(skb, hdr);
3319 return -EMSGSIZE;
3320}
3321
3322static int macsec_generation = 1; /* protected by RTNL */
3323
3324static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
3325{
3326 struct net *net = sock_net(skb->sk);
3327 struct net_device *dev;
3328 int dev_idx, d;
3329
3330 dev_idx = cb->args[0];
3331
3332 d = 0;
3333 rtnl_lock();
3334
3335 cb->seq = macsec_generation;
3336
3337 for_each_netdev(net, dev) {
3338 struct macsec_secy *secy;
3339
3340 if (d < dev_idx)
3341 goto next;
3342
3343 if (!netif_is_macsec(dev))
3344 goto next;
3345
3346 secy = &macsec_priv(dev)->secy;
3347 if (dump_secy(secy, dev, skb, cb) < 0)
3348 goto done;
3349next:
3350 d++;
3351 }
3352
3353done:
3354 rtnl_unlock();
3355 cb->args[0] = d;
3356 return skb->len;
3357}
3358
3359static const struct genl_small_ops macsec_genl_ops[] = {
3360 {
3361 .cmd = MACSEC_CMD_GET_TXSC,
3362 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3363 .dumpit = macsec_dump_txsc,
3364 },
3365 {
3366 .cmd = MACSEC_CMD_ADD_RXSC,
3367 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3368 .doit = macsec_add_rxsc,
3369 .flags = GENL_ADMIN_PERM,
3370 },
3371 {
3372 .cmd = MACSEC_CMD_DEL_RXSC,
3373 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3374 .doit = macsec_del_rxsc,
3375 .flags = GENL_ADMIN_PERM,
3376 },
3377 {
3378 .cmd = MACSEC_CMD_UPD_RXSC,
3379 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3380 .doit = macsec_upd_rxsc,
3381 .flags = GENL_ADMIN_PERM,
3382 },
3383 {
3384 .cmd = MACSEC_CMD_ADD_TXSA,
3385 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3386 .doit = macsec_add_txsa,
3387 .flags = GENL_ADMIN_PERM,
3388 },
3389 {
3390 .cmd = MACSEC_CMD_DEL_TXSA,
3391 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3392 .doit = macsec_del_txsa,
3393 .flags = GENL_ADMIN_PERM,
3394 },
3395 {
3396 .cmd = MACSEC_CMD_UPD_TXSA,
3397 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3398 .doit = macsec_upd_txsa,
3399 .flags = GENL_ADMIN_PERM,
3400 },
3401 {
3402 .cmd = MACSEC_CMD_ADD_RXSA,
3403 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3404 .doit = macsec_add_rxsa,
3405 .flags = GENL_ADMIN_PERM,
3406 },
3407 {
3408 .cmd = MACSEC_CMD_DEL_RXSA,
3409 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3410 .doit = macsec_del_rxsa,
3411 .flags = GENL_ADMIN_PERM,
3412 },
3413 {
3414 .cmd = MACSEC_CMD_UPD_RXSA,
3415 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3416 .doit = macsec_upd_rxsa,
3417 .flags = GENL_ADMIN_PERM,
3418 },
3419 {
3420 .cmd = MACSEC_CMD_UPD_OFFLOAD,
3421 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3422 .doit = macsec_upd_offload,
3423 .flags = GENL_ADMIN_PERM,
3424 },
3425};
3426
3427static struct genl_family macsec_fam __ro_after_init = {
3428 .name = MACSEC_GENL_NAME,
3429 .hdrsize = 0,
3430 .version = MACSEC_GENL_VERSION,
3431 .maxattr = MACSEC_ATTR_MAX,
3432 .policy = macsec_genl_policy,
3433 .netnsok = true,
3434 .module = THIS_MODULE,
3435 .small_ops = macsec_genl_ops,
3436 .n_small_ops = ARRAY_SIZE(macsec_genl_ops),
3437 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1,
3438};
3439
3440static struct sk_buff *macsec_insert_tx_tag(struct sk_buff *skb,
3441 struct net_device *dev)
3442{
3443 struct macsec_dev *macsec = macsec_priv(dev);
3444 const struct macsec_ops *ops;
3445 struct phy_device *phydev;
3446 struct macsec_context ctx;
3447 int skb_final_len;
3448 int err;
3449
3450 ops = macsec_get_ops(macsec, &ctx);
3451 skb_final_len = skb->len - ETH_HLEN + ops->needed_headroom +
3452 ops->needed_tailroom;
3453 if (unlikely(skb_final_len > macsec->real_dev->mtu)) {
3454 err = -EINVAL;
3455 goto cleanup;
3456 }
3457
3458 phydev = macsec->real_dev->phydev;
3459
3460 err = skb_ensure_writable_head_tail(skb, dev);
3461 if (unlikely(err < 0))
3462 goto cleanup;
3463
3464 err = ops->mdo_insert_tx_tag(phydev, skb);
3465 if (unlikely(err))
3466 goto cleanup;
3467
3468 return skb;
3469cleanup:
3470 kfree_skb(skb);
3471 return ERR_PTR(err);
3472}
3473
3474static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3475 struct net_device *dev)
3476{
3477 struct macsec_dev *macsec = netdev_priv(dev);
3478 struct macsec_secy *secy = &macsec->secy;
3479 struct pcpu_secy_stats *secy_stats;
3480 int ret, len;
3481
3482 if (macsec_is_offloaded(netdev_priv(dev))) {
3483 struct metadata_dst *md_dst = secy->tx_sc.md_dst;
3484
3485 skb_dst_drop(skb);
3486 dst_hold(&md_dst->dst);
3487 skb_dst_set(skb, &md_dst->dst);
3488
3489 if (macsec->insert_tx_tag) {
3490 skb = macsec_insert_tx_tag(skb, dev);
3491 if (IS_ERR(skb)) {
3492 DEV_STATS_INC(dev, tx_dropped);
3493 return NETDEV_TX_OK;
3494 }
3495 }
3496
3497 skb->dev = macsec->real_dev;
3498 return dev_queue_xmit(skb);
3499 }
3500
3501 /* 10.5 */
3502 if (!secy->protect_frames) {
3503 secy_stats = this_cpu_ptr(macsec->stats);
3504 u64_stats_update_begin(&secy_stats->syncp);
3505 secy_stats->stats.OutPktsUntagged++;
3506 u64_stats_update_end(&secy_stats->syncp);
3507 skb->dev = macsec->real_dev;
3508 len = skb->len;
3509 ret = dev_queue_xmit(skb);
3510 count_tx(dev, ret, len);
3511 return ret;
3512 }
3513
3514 if (!secy->operational) {
3515 kfree_skb(skb);
3516 DEV_STATS_INC(dev, tx_dropped);
3517 return NETDEV_TX_OK;
3518 }
3519
3520 len = skb->len;
3521 skb = macsec_encrypt(skb, dev);
3522 if (IS_ERR(skb)) {
3523 if (PTR_ERR(skb) != -EINPROGRESS)
3524 DEV_STATS_INC(dev, tx_dropped);
3525 return NETDEV_TX_OK;
3526 }
3527
3528 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3529
3530 macsec_encrypt_finish(skb, dev);
3531 ret = dev_queue_xmit(skb);
3532 count_tx(dev, ret, len);
3533 return ret;
3534}
3535
3536#define MACSEC_FEATURES \
3537 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3538
3539#define MACSEC_OFFLOAD_FEATURES \
3540 (MACSEC_FEATURES | NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES | \
3541 NETIF_F_LRO | NETIF_F_RXHASH | NETIF_F_CSUM_MASK | NETIF_F_RXCSUM)
3542
3543static int macsec_dev_init(struct net_device *dev)
3544{
3545 struct macsec_dev *macsec = macsec_priv(dev);
3546 struct net_device *real_dev = macsec->real_dev;
3547 int err;
3548
3549 err = gro_cells_init(&macsec->gro_cells, dev);
3550 if (err)
3551 return err;
3552
3553 macsec_inherit_tso_max(dev);
3554
3555 dev->hw_features = real_dev->hw_features & MACSEC_OFFLOAD_FEATURES;
3556 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
3557
3558 dev->features = real_dev->features & MACSEC_OFFLOAD_FEATURES;
3559 dev->features |= NETIF_F_GSO_SOFTWARE;
3560 dev->lltx = true;
3561 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
3562
3563 macsec_set_head_tail_room(dev);
3564
3565 if (is_zero_ether_addr(dev->dev_addr))
3566 eth_hw_addr_inherit(dev, real_dev);
3567 if (is_zero_ether_addr(dev->broadcast))
3568 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3569
3570 /* Get macsec's reference to real_dev */
3571 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL);
3572
3573 return 0;
3574}
3575
3576static void macsec_dev_uninit(struct net_device *dev)
3577{
3578 struct macsec_dev *macsec = macsec_priv(dev);
3579
3580 gro_cells_destroy(&macsec->gro_cells);
3581}
3582
3583static netdev_features_t macsec_fix_features(struct net_device *dev,
3584 netdev_features_t features)
3585{
3586 struct macsec_dev *macsec = macsec_priv(dev);
3587 struct net_device *real_dev = macsec->real_dev;
3588 netdev_features_t mask;
3589
3590 mask = macsec_is_offloaded(macsec) ? MACSEC_OFFLOAD_FEATURES
3591 : MACSEC_FEATURES;
3592
3593 features &= (real_dev->features & mask) |
3594 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3595
3596 return features;
3597}
3598
3599static int macsec_dev_open(struct net_device *dev)
3600{
3601 struct macsec_dev *macsec = macsec_priv(dev);
3602 struct net_device *real_dev = macsec->real_dev;
3603 int err;
3604
3605 err = dev_uc_add(real_dev, dev->dev_addr);
3606 if (err < 0)
3607 return err;
3608
3609 if (dev->flags & IFF_ALLMULTI) {
3610 err = dev_set_allmulti(real_dev, 1);
3611 if (err < 0)
3612 goto del_unicast;
3613 }
3614
3615 if (dev->flags & IFF_PROMISC) {
3616 err = dev_set_promiscuity(real_dev, 1);
3617 if (err < 0)
3618 goto clear_allmulti;
3619 }
3620
3621 /* If h/w offloading is available, propagate to the device */
3622 if (macsec_is_offloaded(macsec)) {
3623 const struct macsec_ops *ops;
3624 struct macsec_context ctx;
3625
3626 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3627 if (!ops) {
3628 err = -EOPNOTSUPP;
3629 goto clear_allmulti;
3630 }
3631
3632 ctx.secy = &macsec->secy;
3633 err = macsec_offload(ops->mdo_dev_open, &ctx);
3634 if (err)
3635 goto clear_allmulti;
3636 }
3637
3638 if (netif_carrier_ok(real_dev))
3639 netif_carrier_on(dev);
3640
3641 return 0;
3642clear_allmulti:
3643 if (dev->flags & IFF_ALLMULTI)
3644 dev_set_allmulti(real_dev, -1);
3645del_unicast:
3646 dev_uc_del(real_dev, dev->dev_addr);
3647 netif_carrier_off(dev);
3648 return err;
3649}
3650
3651static int macsec_dev_stop(struct net_device *dev)
3652{
3653 struct macsec_dev *macsec = macsec_priv(dev);
3654 struct net_device *real_dev = macsec->real_dev;
3655
3656 netif_carrier_off(dev);
3657
3658 /* If h/w offloading is available, propagate to the device */
3659 if (macsec_is_offloaded(macsec)) {
3660 const struct macsec_ops *ops;
3661 struct macsec_context ctx;
3662
3663 ops = macsec_get_ops(macsec, &ctx);
3664 if (ops) {
3665 ctx.secy = &macsec->secy;
3666 macsec_offload(ops->mdo_dev_stop, &ctx);
3667 }
3668 }
3669
3670 dev_mc_unsync(real_dev, dev);
3671 dev_uc_unsync(real_dev, dev);
3672
3673 if (dev->flags & IFF_ALLMULTI)
3674 dev_set_allmulti(real_dev, -1);
3675
3676 if (dev->flags & IFF_PROMISC)
3677 dev_set_promiscuity(real_dev, -1);
3678
3679 dev_uc_del(real_dev, dev->dev_addr);
3680
3681 return 0;
3682}
3683
3684static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3685{
3686 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3687
3688 if (!(dev->flags & IFF_UP))
3689 return;
3690
3691 if (change & IFF_ALLMULTI)
3692 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3693
3694 if (change & IFF_PROMISC)
3695 dev_set_promiscuity(real_dev,
3696 dev->flags & IFF_PROMISC ? 1 : -1);
3697}
3698
3699static void macsec_dev_set_rx_mode(struct net_device *dev)
3700{
3701 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3702
3703 dev_mc_sync(real_dev, dev);
3704 dev_uc_sync(real_dev, dev);
3705}
3706
3707static int macsec_set_mac_address(struct net_device *dev, void *p)
3708{
3709 struct macsec_dev *macsec = macsec_priv(dev);
3710 struct net_device *real_dev = macsec->real_dev;
3711 struct sockaddr *addr = p;
3712 u8 old_addr[ETH_ALEN];
3713 int err;
3714
3715 if (!is_valid_ether_addr(addr->sa_data))
3716 return -EADDRNOTAVAIL;
3717
3718 if (dev->flags & IFF_UP) {
3719 err = dev_uc_add(real_dev, addr->sa_data);
3720 if (err < 0)
3721 return err;
3722 }
3723
3724 ether_addr_copy(old_addr, dev->dev_addr);
3725 eth_hw_addr_set(dev, addr->sa_data);
3726
3727 /* If h/w offloading is available, propagate to the device */
3728 if (macsec_is_offloaded(macsec)) {
3729 const struct macsec_ops *ops;
3730 struct macsec_context ctx;
3731
3732 ops = macsec_get_ops(macsec, &ctx);
3733 if (!ops) {
3734 err = -EOPNOTSUPP;
3735 goto restore_old_addr;
3736 }
3737
3738 ctx.secy = &macsec->secy;
3739 err = macsec_offload(ops->mdo_upd_secy, &ctx);
3740 if (err)
3741 goto restore_old_addr;
3742 }
3743
3744 if (dev->flags & IFF_UP)
3745 dev_uc_del(real_dev, old_addr);
3746
3747 return 0;
3748
3749restore_old_addr:
3750 if (dev->flags & IFF_UP)
3751 dev_uc_del(real_dev, addr->sa_data);
3752
3753 eth_hw_addr_set(dev, old_addr);
3754
3755 return err;
3756}
3757
3758static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3759{
3760 struct macsec_dev *macsec = macsec_priv(dev);
3761 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3762
3763 if (macsec->real_dev->mtu - extra < new_mtu)
3764 return -ERANGE;
3765
3766 WRITE_ONCE(dev->mtu, new_mtu);
3767
3768 return 0;
3769}
3770
3771static void macsec_get_stats64(struct net_device *dev,
3772 struct rtnl_link_stats64 *s)
3773{
3774 if (!dev->tstats)
3775 return;
3776
3777 dev_fetch_sw_netstats(s, dev->tstats);
3778
3779 s->rx_dropped = DEV_STATS_READ(dev, rx_dropped);
3780 s->tx_dropped = DEV_STATS_READ(dev, tx_dropped);
3781 s->rx_errors = DEV_STATS_READ(dev, rx_errors);
3782}
3783
3784static int macsec_get_iflink(const struct net_device *dev)
3785{
3786 return READ_ONCE(macsec_priv(dev)->real_dev->ifindex);
3787}
3788
3789static const struct net_device_ops macsec_netdev_ops = {
3790 .ndo_init = macsec_dev_init,
3791 .ndo_uninit = macsec_dev_uninit,
3792 .ndo_open = macsec_dev_open,
3793 .ndo_stop = macsec_dev_stop,
3794 .ndo_fix_features = macsec_fix_features,
3795 .ndo_change_mtu = macsec_change_mtu,
3796 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
3797 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
3798 .ndo_set_mac_address = macsec_set_mac_address,
3799 .ndo_start_xmit = macsec_start_xmit,
3800 .ndo_get_stats64 = macsec_get_stats64,
3801 .ndo_get_iflink = macsec_get_iflink,
3802};
3803
3804static const struct device_type macsec_type = {
3805 .name = "macsec",
3806};
3807
3808static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3809 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3810 [IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3811 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3812 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3813 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3814 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3815 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3816 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3817 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3818 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3819 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3820 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3821 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3822 [IFLA_MACSEC_OFFLOAD] = { .type = NLA_U8 },
3823};
3824
3825static void macsec_free_netdev(struct net_device *dev)
3826{
3827 struct macsec_dev *macsec = macsec_priv(dev);
3828
3829 dst_release(&macsec->secy.tx_sc.md_dst->dst);
3830 free_percpu(macsec->stats);
3831 free_percpu(macsec->secy.tx_sc.stats);
3832
3833 /* Get rid of the macsec's reference to real_dev */
3834 netdev_put(macsec->real_dev, &macsec->dev_tracker);
3835}
3836
3837static void macsec_setup(struct net_device *dev)
3838{
3839 ether_setup(dev);
3840 dev->min_mtu = 0;
3841 dev->max_mtu = ETH_MAX_MTU;
3842 dev->priv_flags |= IFF_NO_QUEUE;
3843 dev->netdev_ops = &macsec_netdev_ops;
3844 dev->needs_free_netdev = true;
3845 dev->priv_destructor = macsec_free_netdev;
3846 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3847
3848 eth_zero_addr(dev->broadcast);
3849}
3850
3851static int macsec_changelink_common(struct net_device *dev,
3852 struct nlattr *data[])
3853{
3854 struct macsec_secy *secy;
3855 struct macsec_tx_sc *tx_sc;
3856
3857 secy = &macsec_priv(dev)->secy;
3858 tx_sc = &secy->tx_sc;
3859
3860 if (data[IFLA_MACSEC_ENCODING_SA]) {
3861 struct macsec_tx_sa *tx_sa;
3862
3863 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3864 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3865
3866 secy->operational = tx_sa && tx_sa->active;
3867 }
3868
3869 if (data[IFLA_MACSEC_ENCRYPT])
3870 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3871
3872 if (data[IFLA_MACSEC_PROTECT])
3873 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3874
3875 if (data[IFLA_MACSEC_INC_SCI])
3876 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3877
3878 if (data[IFLA_MACSEC_ES])
3879 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3880
3881 if (data[IFLA_MACSEC_SCB])
3882 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3883
3884 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3885 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3886
3887 if (data[IFLA_MACSEC_VALIDATION])
3888 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3889
3890 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3891 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3892 case MACSEC_CIPHER_ID_GCM_AES_128:
3893 case MACSEC_DEFAULT_CIPHER_ID:
3894 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3895 secy->xpn = false;
3896 break;
3897 case MACSEC_CIPHER_ID_GCM_AES_256:
3898 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3899 secy->xpn = false;
3900 break;
3901 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
3902 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3903 secy->xpn = true;
3904 break;
3905 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
3906 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3907 secy->xpn = true;
3908 break;
3909 default:
3910 return -EINVAL;
3911 }
3912 }
3913
3914 if (data[IFLA_MACSEC_WINDOW]) {
3915 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3916
3917 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window
3918 * for XPN cipher suites */
3919 if (secy->xpn &&
3920 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW)
3921 return -EINVAL;
3922 }
3923
3924 return 0;
3925}
3926
3927static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3928 struct nlattr *data[],
3929 struct netlink_ext_ack *extack)
3930{
3931 struct macsec_dev *macsec = macsec_priv(dev);
3932 bool macsec_offload_state_change = false;
3933 enum macsec_offload offload;
3934 struct macsec_tx_sc tx_sc;
3935 struct macsec_secy secy;
3936 int ret;
3937
3938 if (!data)
3939 return 0;
3940
3941 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3942 data[IFLA_MACSEC_ICV_LEN] ||
3943 data[IFLA_MACSEC_SCI] ||
3944 data[IFLA_MACSEC_PORT])
3945 return -EINVAL;
3946
3947 /* Keep a copy of unmodified secy and tx_sc, in case the offload
3948 * propagation fails, to revert macsec_changelink_common.
3949 */
3950 memcpy(&secy, &macsec->secy, sizeof(secy));
3951 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3952
3953 ret = macsec_changelink_common(dev, data);
3954 if (ret)
3955 goto cleanup;
3956
3957 if (data[IFLA_MACSEC_OFFLOAD]) {
3958 offload = nla_get_u8(data[IFLA_MACSEC_OFFLOAD]);
3959 if (macsec->offload != offload) {
3960 macsec_offload_state_change = true;
3961 ret = macsec_update_offload(dev, offload);
3962 if (ret)
3963 goto cleanup;
3964 }
3965 }
3966
3967 /* If h/w offloading is available, propagate to the device */
3968 if (!macsec_offload_state_change && macsec_is_offloaded(macsec)) {
3969 const struct macsec_ops *ops;
3970 struct macsec_context ctx;
3971
3972 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3973 if (!ops) {
3974 ret = -EOPNOTSUPP;
3975 goto cleanup;
3976 }
3977
3978 ctx.secy = &macsec->secy;
3979 ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3980 if (ret)
3981 goto cleanup;
3982 }
3983
3984 return 0;
3985
3986cleanup:
3987 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3988 memcpy(&macsec->secy, &secy, sizeof(secy));
3989
3990 return ret;
3991}
3992
3993static void macsec_del_dev(struct macsec_dev *macsec)
3994{
3995 int i;
3996
3997 while (macsec->secy.rx_sc) {
3998 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3999
4000 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
4001 free_rx_sc(rx_sc);
4002 }
4003
4004 for (i = 0; i < MACSEC_NUM_AN; i++) {
4005 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
4006
4007 if (sa) {
4008 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
4009 clear_tx_sa(sa);
4010 }
4011 }
4012}
4013
4014static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
4015{
4016 struct macsec_dev *macsec = macsec_priv(dev);
4017 struct net_device *real_dev = macsec->real_dev;
4018
4019 /* If h/w offloading is available, propagate to the device */
4020 if (macsec_is_offloaded(macsec)) {
4021 const struct macsec_ops *ops;
4022 struct macsec_context ctx;
4023
4024 ops = macsec_get_ops(netdev_priv(dev), &ctx);
4025 if (ops) {
4026 ctx.secy = &macsec->secy;
4027 macsec_offload(ops->mdo_del_secy, &ctx);
4028 }
4029 }
4030
4031 unregister_netdevice_queue(dev, head);
4032 list_del_rcu(&macsec->secys);
4033 macsec_del_dev(macsec);
4034 netdev_upper_dev_unlink(real_dev, dev);
4035
4036 macsec_generation++;
4037}
4038
4039static void macsec_dellink(struct net_device *dev, struct list_head *head)
4040{
4041 struct macsec_dev *macsec = macsec_priv(dev);
4042 struct net_device *real_dev = macsec->real_dev;
4043 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
4044
4045 macsec_common_dellink(dev, head);
4046
4047 if (list_empty(&rxd->secys)) {
4048 netdev_rx_handler_unregister(real_dev);
4049 kfree(rxd);
4050 }
4051}
4052
4053static int register_macsec_dev(struct net_device *real_dev,
4054 struct net_device *dev)
4055{
4056 struct macsec_dev *macsec = macsec_priv(dev);
4057 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
4058
4059 if (!rxd) {
4060 int err;
4061
4062 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
4063 if (!rxd)
4064 return -ENOMEM;
4065
4066 INIT_LIST_HEAD(&rxd->secys);
4067
4068 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
4069 rxd);
4070 if (err < 0) {
4071 kfree(rxd);
4072 return err;
4073 }
4074 }
4075
4076 list_add_tail_rcu(&macsec->secys, &rxd->secys);
4077 return 0;
4078}
4079
4080static bool sci_exists(struct net_device *dev, sci_t sci)
4081{
4082 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
4083 struct macsec_dev *macsec;
4084
4085 list_for_each_entry(macsec, &rxd->secys, secys) {
4086 if (macsec->secy.sci == sci)
4087 return true;
4088 }
4089
4090 return false;
4091}
4092
4093static sci_t dev_to_sci(struct net_device *dev, __be16 port)
4094{
4095 return make_sci(dev->dev_addr, port);
4096}
4097
4098static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
4099{
4100 struct macsec_dev *macsec = macsec_priv(dev);
4101 struct macsec_secy *secy = &macsec->secy;
4102
4103 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
4104 if (!macsec->stats)
4105 return -ENOMEM;
4106
4107 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
4108 if (!secy->tx_sc.stats)
4109 return -ENOMEM;
4110
4111 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL);
4112 if (!secy->tx_sc.md_dst)
4113 /* macsec and secy percpu stats will be freed when unregistering
4114 * net_device in macsec_free_netdev()
4115 */
4116 return -ENOMEM;
4117
4118 if (sci == MACSEC_UNDEF_SCI)
4119 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4120
4121 secy->netdev = dev;
4122 secy->operational = true;
4123 secy->key_len = DEFAULT_SAK_LEN;
4124 secy->icv_len = icv_len;
4125 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
4126 secy->protect_frames = true;
4127 secy->replay_protect = false;
4128 secy->xpn = DEFAULT_XPN;
4129
4130 secy->sci = sci;
4131 secy->tx_sc.md_dst->u.macsec_info.sci = sci;
4132 secy->tx_sc.active = true;
4133 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
4134 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
4135 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
4136 secy->tx_sc.end_station = false;
4137 secy->tx_sc.scb = false;
4138
4139 return 0;
4140}
4141
4142static struct lock_class_key macsec_netdev_addr_lock_key;
4143
4144static int macsec_newlink(struct net *net, struct net_device *dev,
4145 struct nlattr *tb[], struct nlattr *data[],
4146 struct netlink_ext_ack *extack)
4147{
4148 struct macsec_dev *macsec = macsec_priv(dev);
4149 rx_handler_func_t *rx_handler;
4150 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4151 struct net_device *real_dev;
4152 int err, mtu;
4153 sci_t sci;
4154
4155 if (!tb[IFLA_LINK])
4156 return -EINVAL;
4157 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
4158 if (!real_dev)
4159 return -ENODEV;
4160 if (real_dev->type != ARPHRD_ETHER)
4161 return -EINVAL;
4162
4163 dev->priv_flags |= IFF_MACSEC;
4164
4165 macsec->real_dev = real_dev;
4166
4167 if (data && data[IFLA_MACSEC_OFFLOAD])
4168 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
4169 else
4170 /* MACsec offloading is off by default */
4171 macsec->offload = MACSEC_OFFLOAD_OFF;
4172
4173 /* Check if the offloading mode is supported by the underlying layers */
4174 if (macsec->offload != MACSEC_OFFLOAD_OFF &&
4175 !macsec_check_offload(macsec->offload, macsec))
4176 return -EOPNOTSUPP;
4177
4178 /* send_sci must be set to true when transmit sci explicitly is set */
4179 if ((data && data[IFLA_MACSEC_SCI]) &&
4180 (data && data[IFLA_MACSEC_INC_SCI])) {
4181 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
4182
4183 if (!send_sci)
4184 return -EINVAL;
4185 }
4186
4187 if (data && data[IFLA_MACSEC_ICV_LEN])
4188 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4189 mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
4190 if (mtu < 0)
4191 dev->mtu = 0;
4192 else
4193 dev->mtu = mtu;
4194
4195 rx_handler = rtnl_dereference(real_dev->rx_handler);
4196 if (rx_handler && rx_handler != macsec_handle_frame)
4197 return -EBUSY;
4198
4199 err = register_netdevice(dev);
4200 if (err < 0)
4201 return err;
4202
4203 netdev_lockdep_set_classes(dev);
4204 lockdep_set_class(&dev->addr_list_lock,
4205 &macsec_netdev_addr_lock_key);
4206
4207 err = netdev_upper_dev_link(real_dev, dev, extack);
4208 if (err < 0)
4209 goto unregister;
4210
4211 /* need to be already registered so that ->init has run and
4212 * the MAC addr is set
4213 */
4214 if (data && data[IFLA_MACSEC_SCI])
4215 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
4216 else if (data && data[IFLA_MACSEC_PORT])
4217 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
4218 else
4219 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4220
4221 if (rx_handler && sci_exists(real_dev, sci)) {
4222 err = -EBUSY;
4223 goto unlink;
4224 }
4225
4226 err = macsec_add_dev(dev, sci, icv_len);
4227 if (err)
4228 goto unlink;
4229
4230 if (data) {
4231 err = macsec_changelink_common(dev, data);
4232 if (err)
4233 goto del_dev;
4234 }
4235
4236 /* If h/w offloading is available, propagate to the device */
4237 if (macsec_is_offloaded(macsec)) {
4238 const struct macsec_ops *ops;
4239 struct macsec_context ctx;
4240
4241 ops = macsec_get_ops(macsec, &ctx);
4242 if (ops) {
4243 ctx.secy = &macsec->secy;
4244 err = macsec_offload(ops->mdo_add_secy, &ctx);
4245 if (err)
4246 goto del_dev;
4247
4248 macsec->insert_tx_tag =
4249 macsec_needs_tx_tag(macsec, ops);
4250 }
4251 }
4252
4253 err = register_macsec_dev(real_dev, dev);
4254 if (err < 0)
4255 goto del_dev;
4256
4257 netif_stacked_transfer_operstate(real_dev, dev);
4258 linkwatch_fire_event(dev);
4259
4260 macsec_generation++;
4261
4262 return 0;
4263
4264del_dev:
4265 macsec_del_dev(macsec);
4266unlink:
4267 netdev_upper_dev_unlink(real_dev, dev);
4268unregister:
4269 unregister_netdevice(dev);
4270 return err;
4271}
4272
4273static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
4274 struct netlink_ext_ack *extack)
4275{
4276 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
4277 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4278 int flag;
4279 bool es, scb, sci;
4280
4281 if (!data)
4282 return 0;
4283
4284 if (data[IFLA_MACSEC_CIPHER_SUITE])
4285 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
4286
4287 if (data[IFLA_MACSEC_ICV_LEN]) {
4288 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4289 if (icv_len != MACSEC_DEFAULT_ICV_LEN) {
4290 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
4291 struct crypto_aead *dummy_tfm;
4292
4293 dummy_tfm = macsec_alloc_tfm(dummy_key,
4294 DEFAULT_SAK_LEN,
4295 icv_len);
4296 if (IS_ERR(dummy_tfm))
4297 return PTR_ERR(dummy_tfm);
4298 crypto_free_aead(dummy_tfm);
4299 }
4300 }
4301
4302 switch (csid) {
4303 case MACSEC_CIPHER_ID_GCM_AES_128:
4304 case MACSEC_CIPHER_ID_GCM_AES_256:
4305 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
4306 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
4307 case MACSEC_DEFAULT_CIPHER_ID:
4308 if (icv_len < MACSEC_MIN_ICV_LEN ||
4309 icv_len > MACSEC_STD_ICV_LEN)
4310 return -EINVAL;
4311 break;
4312 default:
4313 return -EINVAL;
4314 }
4315
4316 if (data[IFLA_MACSEC_ENCODING_SA]) {
4317 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
4318 return -EINVAL;
4319 }
4320
4321 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
4322 flag < IFLA_MACSEC_VALIDATION;
4323 flag++) {
4324 if (data[flag]) {
4325 if (nla_get_u8(data[flag]) > 1)
4326 return -EINVAL;
4327 }
4328 }
4329
4330 es = nla_get_u8_default(data[IFLA_MACSEC_ES], false);
4331 sci = nla_get_u8_default(data[IFLA_MACSEC_INC_SCI], false);
4332 scb = nla_get_u8_default(data[IFLA_MACSEC_SCB], false);
4333
4334 if ((sci && (scb || es)) || (scb && es))
4335 return -EINVAL;
4336
4337 if (data[IFLA_MACSEC_VALIDATION] &&
4338 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
4339 return -EINVAL;
4340
4341 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
4342 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
4343 !data[IFLA_MACSEC_WINDOW])
4344 return -EINVAL;
4345
4346 return 0;
4347}
4348
4349static struct net *macsec_get_link_net(const struct net_device *dev)
4350{
4351 return dev_net(macsec_priv(dev)->real_dev);
4352}
4353
4354struct net_device *macsec_get_real_dev(const struct net_device *dev)
4355{
4356 return macsec_priv(dev)->real_dev;
4357}
4358EXPORT_SYMBOL_GPL(macsec_get_real_dev);
4359
4360bool macsec_netdev_is_offloaded(struct net_device *dev)
4361{
4362 return macsec_is_offloaded(macsec_priv(dev));
4363}
4364EXPORT_SYMBOL_GPL(macsec_netdev_is_offloaded);
4365
4366static size_t macsec_get_size(const struct net_device *dev)
4367{
4368 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
4369 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
4370 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
4371 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
4372 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
4373 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
4374 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
4375 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
4376 nla_total_size(1) + /* IFLA_MACSEC_ES */
4377 nla_total_size(1) + /* IFLA_MACSEC_SCB */
4378 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
4379 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
4380 nla_total_size(1) + /* IFLA_MACSEC_OFFLOAD */
4381 0;
4382}
4383
4384static int macsec_fill_info(struct sk_buff *skb,
4385 const struct net_device *dev)
4386{
4387 struct macsec_tx_sc *tx_sc;
4388 struct macsec_dev *macsec;
4389 struct macsec_secy *secy;
4390 u64 csid;
4391
4392 macsec = macsec_priv(dev);
4393 secy = &macsec->secy;
4394 tx_sc = &secy->tx_sc;
4395
4396 switch (secy->key_len) {
4397 case MACSEC_GCM_AES_128_SAK_LEN:
4398 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
4399 break;
4400 case MACSEC_GCM_AES_256_SAK_LEN:
4401 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
4402 break;
4403 default:
4404 goto nla_put_failure;
4405 }
4406
4407 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
4408 IFLA_MACSEC_PAD) ||
4409 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
4410 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
4411 csid, IFLA_MACSEC_PAD) ||
4412 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
4413 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
4414 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
4415 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
4416 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
4417 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
4418 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
4419 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
4420 nla_put_u8(skb, IFLA_MACSEC_OFFLOAD, macsec->offload) ||
4421 0)
4422 goto nla_put_failure;
4423
4424 if (secy->replay_protect) {
4425 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
4426 goto nla_put_failure;
4427 }
4428
4429 return 0;
4430
4431nla_put_failure:
4432 return -EMSGSIZE;
4433}
4434
4435static struct rtnl_link_ops macsec_link_ops __read_mostly = {
4436 .kind = "macsec",
4437 .priv_size = sizeof(struct macsec_dev),
4438 .maxtype = IFLA_MACSEC_MAX,
4439 .policy = macsec_rtnl_policy,
4440 .setup = macsec_setup,
4441 .validate = macsec_validate_attr,
4442 .newlink = macsec_newlink,
4443 .changelink = macsec_changelink,
4444 .dellink = macsec_dellink,
4445 .get_size = macsec_get_size,
4446 .fill_info = macsec_fill_info,
4447 .get_link_net = macsec_get_link_net,
4448};
4449
4450static bool is_macsec_master(struct net_device *dev)
4451{
4452 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
4453}
4454
4455static int macsec_notify(struct notifier_block *this, unsigned long event,
4456 void *ptr)
4457{
4458 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
4459 struct macsec_rxh_data *rxd;
4460 struct macsec_dev *m, *n;
4461 LIST_HEAD(head);
4462
4463 if (!is_macsec_master(real_dev))
4464 return NOTIFY_DONE;
4465
4466 rxd = macsec_data_rtnl(real_dev);
4467
4468 switch (event) {
4469 case NETDEV_DOWN:
4470 case NETDEV_UP:
4471 case NETDEV_CHANGE:
4472 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4473 struct net_device *dev = m->secy.netdev;
4474
4475 netif_stacked_transfer_operstate(real_dev, dev);
4476 }
4477 break;
4478 case NETDEV_UNREGISTER:
4479 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4480 macsec_common_dellink(m->secy.netdev, &head);
4481 }
4482
4483 netdev_rx_handler_unregister(real_dev);
4484 kfree(rxd);
4485
4486 unregister_netdevice_many(&head);
4487 break;
4488 case NETDEV_CHANGEMTU:
4489 list_for_each_entry(m, &rxd->secys, secys) {
4490 struct net_device *dev = m->secy.netdev;
4491 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
4492 macsec_extra_len(true));
4493
4494 if (dev->mtu > mtu)
4495 dev_set_mtu(dev, mtu);
4496 }
4497 break;
4498 case NETDEV_FEAT_CHANGE:
4499 list_for_each_entry(m, &rxd->secys, secys) {
4500 macsec_inherit_tso_max(m->secy.netdev);
4501 netdev_update_features(m->secy.netdev);
4502 }
4503 break;
4504 }
4505
4506 return NOTIFY_OK;
4507}
4508
4509static struct notifier_block macsec_notifier = {
4510 .notifier_call = macsec_notify,
4511};
4512
4513static int __init macsec_init(void)
4514{
4515 int err;
4516
4517 pr_info("MACsec IEEE 802.1AE\n");
4518 err = register_netdevice_notifier(&macsec_notifier);
4519 if (err)
4520 return err;
4521
4522 err = rtnl_link_register(&macsec_link_ops);
4523 if (err)
4524 goto notifier;
4525
4526 err = genl_register_family(&macsec_fam);
4527 if (err)
4528 goto rtnl;
4529
4530 return 0;
4531
4532rtnl:
4533 rtnl_link_unregister(&macsec_link_ops);
4534notifier:
4535 unregister_netdevice_notifier(&macsec_notifier);
4536 return err;
4537}
4538
4539static void __exit macsec_exit(void)
4540{
4541 genl_unregister_family(&macsec_fam);
4542 rtnl_link_unregister(&macsec_link_ops);
4543 unregister_netdevice_notifier(&macsec_notifier);
4544 rcu_barrier();
4545}
4546
4547module_init(macsec_init);
4548module_exit(macsec_exit);
4549
4550MODULE_ALIAS_RTNL_LINK("macsec");
4551MODULE_ALIAS_GENL_FAMILY("macsec");
4552
4553MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
4554MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * drivers/net/macsec.c - MACsec device
4 *
5 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
6 */
7
8#include <linux/types.h>
9#include <linux/skbuff.h>
10#include <linux/socket.h>
11#include <linux/module.h>
12#include <crypto/aead.h>
13#include <linux/etherdevice.h>
14#include <linux/netdevice.h>
15#include <linux/rtnetlink.h>
16#include <linux/refcount.h>
17#include <net/genetlink.h>
18#include <net/sock.h>
19#include <net/gro_cells.h>
20#include <net/macsec.h>
21#include <net/dst_metadata.h>
22#include <linux/phy.h>
23#include <linux/byteorder/generic.h>
24#include <linux/if_arp.h>
25
26#include <uapi/linux/if_macsec.h>
27
28/* SecTAG length = macsec_eth_header without the optional SCI */
29#define MACSEC_TAG_LEN 6
30
31struct macsec_eth_header {
32 struct ethhdr eth;
33 /* SecTAG */
34 u8 tci_an;
35#if defined(__LITTLE_ENDIAN_BITFIELD)
36 u8 short_length:6,
37 unused:2;
38#elif defined(__BIG_ENDIAN_BITFIELD)
39 u8 unused:2,
40 short_length:6;
41#else
42#error "Please fix <asm/byteorder.h>"
43#endif
44 __be32 packet_number;
45 u8 secure_channel_id[8]; /* optional */
46} __packed;
47
48/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
49#define MIN_NON_SHORT_LEN 48
50
51#define GCM_AES_IV_LEN 12
52
53#define for_each_rxsc(secy, sc) \
54 for (sc = rcu_dereference_bh(secy->rx_sc); \
55 sc; \
56 sc = rcu_dereference_bh(sc->next))
57#define for_each_rxsc_rtnl(secy, sc) \
58 for (sc = rtnl_dereference(secy->rx_sc); \
59 sc; \
60 sc = rtnl_dereference(sc->next))
61
62#define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31)))
63
64struct gcm_iv_xpn {
65 union {
66 u8 short_secure_channel_id[4];
67 ssci_t ssci;
68 };
69 __be64 pn;
70} __packed;
71
72struct gcm_iv {
73 union {
74 u8 secure_channel_id[8];
75 sci_t sci;
76 };
77 __be32 pn;
78};
79
80#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
81
82struct pcpu_secy_stats {
83 struct macsec_dev_stats stats;
84 struct u64_stats_sync syncp;
85};
86
87/**
88 * struct macsec_dev - private data
89 * @secy: SecY config
90 * @real_dev: pointer to underlying netdevice
91 * @dev_tracker: refcount tracker for @real_dev reference
92 * @stats: MACsec device stats
93 * @secys: linked list of SecY's on the underlying device
94 * @gro_cells: pointer to the Generic Receive Offload cell
95 * @offload: status of offloading on the MACsec device
96 * @insert_tx_tag: when offloading, device requires to insert an
97 * additional tag
98 */
99struct macsec_dev {
100 struct macsec_secy secy;
101 struct net_device *real_dev;
102 netdevice_tracker dev_tracker;
103 struct pcpu_secy_stats __percpu *stats;
104 struct list_head secys;
105 struct gro_cells gro_cells;
106 enum macsec_offload offload;
107 bool insert_tx_tag;
108};
109
110/**
111 * struct macsec_rxh_data - rx_handler private argument
112 * @secys: linked list of SecY's on this underlying device
113 */
114struct macsec_rxh_data {
115 struct list_head secys;
116};
117
118static struct macsec_dev *macsec_priv(const struct net_device *dev)
119{
120 return (struct macsec_dev *)netdev_priv(dev);
121}
122
123static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
124{
125 return rcu_dereference_bh(dev->rx_handler_data);
126}
127
128static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
129{
130 return rtnl_dereference(dev->rx_handler_data);
131}
132
133struct macsec_cb {
134 struct aead_request *req;
135 union {
136 struct macsec_tx_sa *tx_sa;
137 struct macsec_rx_sa *rx_sa;
138 };
139 u8 assoc_num;
140 bool valid;
141 bool has_sci;
142};
143
144static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
145{
146 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
147
148 if (!sa || !sa->active)
149 return NULL;
150
151 if (!refcount_inc_not_zero(&sa->refcnt))
152 return NULL;
153
154 return sa;
155}
156
157static struct macsec_rx_sa *macsec_active_rxsa_get(struct macsec_rx_sc *rx_sc)
158{
159 struct macsec_rx_sa *sa = NULL;
160 int an;
161
162 for (an = 0; an < MACSEC_NUM_AN; an++) {
163 sa = macsec_rxsa_get(rx_sc->sa[an]);
164 if (sa)
165 break;
166 }
167 return sa;
168}
169
170static void free_rx_sc_rcu(struct rcu_head *head)
171{
172 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
173
174 free_percpu(rx_sc->stats);
175 kfree(rx_sc);
176}
177
178static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
179{
180 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
181}
182
183static void macsec_rxsc_put(struct macsec_rx_sc *sc)
184{
185 if (refcount_dec_and_test(&sc->refcnt))
186 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
187}
188
189static void free_rxsa(struct rcu_head *head)
190{
191 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
192
193 crypto_free_aead(sa->key.tfm);
194 free_percpu(sa->stats);
195 kfree(sa);
196}
197
198static void macsec_rxsa_put(struct macsec_rx_sa *sa)
199{
200 if (refcount_dec_and_test(&sa->refcnt))
201 call_rcu(&sa->rcu, free_rxsa);
202}
203
204static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
205{
206 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
207
208 if (!sa || !sa->active)
209 return NULL;
210
211 if (!refcount_inc_not_zero(&sa->refcnt))
212 return NULL;
213
214 return sa;
215}
216
217static void free_txsa(struct rcu_head *head)
218{
219 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
220
221 crypto_free_aead(sa->key.tfm);
222 free_percpu(sa->stats);
223 kfree(sa);
224}
225
226static void macsec_txsa_put(struct macsec_tx_sa *sa)
227{
228 if (refcount_dec_and_test(&sa->refcnt))
229 call_rcu(&sa->rcu, free_txsa);
230}
231
232static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
233{
234 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
235 return (struct macsec_cb *)skb->cb;
236}
237
238#define MACSEC_PORT_SCB (0x0000)
239#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
240#define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
241
242#define MACSEC_GCM_AES_128_SAK_LEN 16
243#define MACSEC_GCM_AES_256_SAK_LEN 32
244
245#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
246#define DEFAULT_XPN false
247#define DEFAULT_SEND_SCI true
248#define DEFAULT_ENCRYPT false
249#define DEFAULT_ENCODING_SA 0
250#define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1))
251
252static sci_t make_sci(const u8 *addr, __be16 port)
253{
254 sci_t sci;
255
256 memcpy(&sci, addr, ETH_ALEN);
257 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
258
259 return sci;
260}
261
262static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
263{
264 sci_t sci;
265
266 if (sci_present)
267 memcpy(&sci, hdr->secure_channel_id,
268 sizeof(hdr->secure_channel_id));
269 else
270 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
271
272 return sci;
273}
274
275static unsigned int macsec_sectag_len(bool sci_present)
276{
277 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
278}
279
280static unsigned int macsec_hdr_len(bool sci_present)
281{
282 return macsec_sectag_len(sci_present) + ETH_HLEN;
283}
284
285static unsigned int macsec_extra_len(bool sci_present)
286{
287 return macsec_sectag_len(sci_present) + sizeof(__be16);
288}
289
290/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
291static void macsec_fill_sectag(struct macsec_eth_header *h,
292 const struct macsec_secy *secy, u32 pn,
293 bool sci_present)
294{
295 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
296
297 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
298 h->eth.h_proto = htons(ETH_P_MACSEC);
299
300 if (sci_present) {
301 h->tci_an |= MACSEC_TCI_SC;
302 memcpy(&h->secure_channel_id, &secy->sci,
303 sizeof(h->secure_channel_id));
304 } else {
305 if (tx_sc->end_station)
306 h->tci_an |= MACSEC_TCI_ES;
307 if (tx_sc->scb)
308 h->tci_an |= MACSEC_TCI_SCB;
309 }
310
311 h->packet_number = htonl(pn);
312
313 /* with GCM, C/E clear for !encrypt, both set for encrypt */
314 if (tx_sc->encrypt)
315 h->tci_an |= MACSEC_TCI_CONFID;
316 else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN)
317 h->tci_an |= MACSEC_TCI_C;
318
319 h->tci_an |= tx_sc->encoding_sa;
320}
321
322static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
323{
324 if (data_len < MIN_NON_SHORT_LEN)
325 h->short_length = data_len;
326}
327
328/* Checks if a MACsec interface is being offloaded to an hardware engine */
329static bool macsec_is_offloaded(struct macsec_dev *macsec)
330{
331 if (macsec->offload == MACSEC_OFFLOAD_MAC ||
332 macsec->offload == MACSEC_OFFLOAD_PHY)
333 return true;
334
335 return false;
336}
337
338/* Checks if underlying layers implement MACsec offloading functions. */
339static bool macsec_check_offload(enum macsec_offload offload,
340 struct macsec_dev *macsec)
341{
342 if (!macsec || !macsec->real_dev)
343 return false;
344
345 if (offload == MACSEC_OFFLOAD_PHY)
346 return macsec->real_dev->phydev &&
347 macsec->real_dev->phydev->macsec_ops;
348 else if (offload == MACSEC_OFFLOAD_MAC)
349 return macsec->real_dev->features & NETIF_F_HW_MACSEC &&
350 macsec->real_dev->macsec_ops;
351
352 return false;
353}
354
355static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload,
356 struct macsec_dev *macsec,
357 struct macsec_context *ctx)
358{
359 if (ctx) {
360 memset(ctx, 0, sizeof(*ctx));
361 ctx->offload = offload;
362
363 if (offload == MACSEC_OFFLOAD_PHY)
364 ctx->phydev = macsec->real_dev->phydev;
365 else if (offload == MACSEC_OFFLOAD_MAC)
366 ctx->netdev = macsec->real_dev;
367 }
368
369 if (offload == MACSEC_OFFLOAD_PHY)
370 return macsec->real_dev->phydev->macsec_ops;
371 else
372 return macsec->real_dev->macsec_ops;
373}
374
375/* Returns a pointer to the MACsec ops struct if any and updates the MACsec
376 * context device reference if provided.
377 */
378static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
379 struct macsec_context *ctx)
380{
381 if (!macsec_check_offload(macsec->offload, macsec))
382 return NULL;
383
384 return __macsec_get_ops(macsec->offload, macsec, ctx);
385}
386
387/* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */
388static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn)
389{
390 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
391 int len = skb->len - 2 * ETH_ALEN;
392 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
393
394 /* a) It comprises at least 17 octets */
395 if (skb->len <= 16)
396 return false;
397
398 /* b) MACsec EtherType: already checked */
399
400 /* c) V bit is clear */
401 if (h->tci_an & MACSEC_TCI_VERSION)
402 return false;
403
404 /* d) ES or SCB => !SC */
405 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
406 (h->tci_an & MACSEC_TCI_SC))
407 return false;
408
409 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
410 if (h->unused)
411 return false;
412
413 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */
414 if (!h->packet_number && !xpn)
415 return false;
416
417 /* length check, f) g) h) i) */
418 if (h->short_length)
419 return len == extra_len + h->short_length;
420 return len >= extra_len + MIN_NON_SHORT_LEN;
421}
422
423#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
424#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
425
426static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn,
427 salt_t salt)
428{
429 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv;
430
431 gcm_iv->ssci = ssci ^ salt.ssci;
432 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn;
433}
434
435static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
436{
437 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
438
439 gcm_iv->sci = sci;
440 gcm_iv->pn = htonl(pn);
441}
442
443static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
444{
445 return (struct macsec_eth_header *)skb_mac_header(skb);
446}
447
448static void __macsec_pn_wrapped(struct macsec_secy *secy,
449 struct macsec_tx_sa *tx_sa)
450{
451 pr_debug("PN wrapped, transitioning to !oper\n");
452 tx_sa->active = false;
453 if (secy->protect_frames)
454 secy->operational = false;
455}
456
457void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
458{
459 spin_lock_bh(&tx_sa->lock);
460 __macsec_pn_wrapped(secy, tx_sa);
461 spin_unlock_bh(&tx_sa->lock);
462}
463EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
464
465static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
466 struct macsec_secy *secy)
467{
468 pn_t pn;
469
470 spin_lock_bh(&tx_sa->lock);
471
472 pn = tx_sa->next_pn_halves;
473 if (secy->xpn)
474 tx_sa->next_pn++;
475 else
476 tx_sa->next_pn_halves.lower++;
477
478 if (tx_sa->next_pn == 0)
479 __macsec_pn_wrapped(secy, tx_sa);
480 spin_unlock_bh(&tx_sa->lock);
481
482 return pn;
483}
484
485static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
486{
487 struct macsec_dev *macsec = netdev_priv(dev);
488
489 skb->dev = macsec->real_dev;
490 skb_reset_mac_header(skb);
491 skb->protocol = eth_hdr(skb)->h_proto;
492}
493
494static unsigned int macsec_msdu_len(struct sk_buff *skb)
495{
496 struct macsec_dev *macsec = macsec_priv(skb->dev);
497 struct macsec_secy *secy = &macsec->secy;
498 bool sci_present = macsec_skb_cb(skb)->has_sci;
499
500 return skb->len - macsec_hdr_len(sci_present) - secy->icv_len;
501}
502
503static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
504 struct macsec_tx_sa *tx_sa)
505{
506 unsigned int msdu_len = macsec_msdu_len(skb);
507 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
508
509 u64_stats_update_begin(&txsc_stats->syncp);
510 if (tx_sc->encrypt) {
511 txsc_stats->stats.OutOctetsEncrypted += msdu_len;
512 txsc_stats->stats.OutPktsEncrypted++;
513 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
514 } else {
515 txsc_stats->stats.OutOctetsProtected += msdu_len;
516 txsc_stats->stats.OutPktsProtected++;
517 this_cpu_inc(tx_sa->stats->OutPktsProtected);
518 }
519 u64_stats_update_end(&txsc_stats->syncp);
520}
521
522static void count_tx(struct net_device *dev, int ret, int len)
523{
524 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN))
525 dev_sw_netstats_tx_add(dev, 1, len);
526}
527
528static void macsec_encrypt_done(void *data, int err)
529{
530 struct sk_buff *skb = data;
531 struct net_device *dev = skb->dev;
532 struct macsec_dev *macsec = macsec_priv(dev);
533 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
534 int len, ret;
535
536 aead_request_free(macsec_skb_cb(skb)->req);
537
538 rcu_read_lock_bh();
539 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
540 /* packet is encrypted/protected so tx_bytes must be calculated */
541 len = macsec_msdu_len(skb) + 2 * ETH_ALEN;
542 macsec_encrypt_finish(skb, dev);
543 ret = dev_queue_xmit(skb);
544 count_tx(dev, ret, len);
545 rcu_read_unlock_bh();
546
547 macsec_txsa_put(sa);
548 dev_put(dev);
549}
550
551static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
552 unsigned char **iv,
553 struct scatterlist **sg,
554 int num_frags)
555{
556 size_t size, iv_offset, sg_offset;
557 struct aead_request *req;
558 void *tmp;
559
560 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
561 iv_offset = size;
562 size += GCM_AES_IV_LEN;
563
564 size = ALIGN(size, __alignof__(struct scatterlist));
565 sg_offset = size;
566 size += sizeof(struct scatterlist) * num_frags;
567
568 tmp = kmalloc(size, GFP_ATOMIC);
569 if (!tmp)
570 return NULL;
571
572 *iv = (unsigned char *)(tmp + iv_offset);
573 *sg = (struct scatterlist *)(tmp + sg_offset);
574 req = tmp;
575
576 aead_request_set_tfm(req, tfm);
577
578 return req;
579}
580
581static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
582 struct net_device *dev)
583{
584 int ret;
585 struct scatterlist *sg;
586 struct sk_buff *trailer;
587 unsigned char *iv;
588 struct ethhdr *eth;
589 struct macsec_eth_header *hh;
590 size_t unprotected_len;
591 struct aead_request *req;
592 struct macsec_secy *secy;
593 struct macsec_tx_sc *tx_sc;
594 struct macsec_tx_sa *tx_sa;
595 struct macsec_dev *macsec = macsec_priv(dev);
596 bool sci_present;
597 pn_t pn;
598
599 secy = &macsec->secy;
600 tx_sc = &secy->tx_sc;
601
602 /* 10.5.1 TX SA assignment */
603 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
604 if (!tx_sa) {
605 secy->operational = false;
606 kfree_skb(skb);
607 return ERR_PTR(-EINVAL);
608 }
609
610 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
611 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
612 struct sk_buff *nskb = skb_copy_expand(skb,
613 MACSEC_NEEDED_HEADROOM,
614 MACSEC_NEEDED_TAILROOM,
615 GFP_ATOMIC);
616 if (likely(nskb)) {
617 consume_skb(skb);
618 skb = nskb;
619 } else {
620 macsec_txsa_put(tx_sa);
621 kfree_skb(skb);
622 return ERR_PTR(-ENOMEM);
623 }
624 } else {
625 skb = skb_unshare(skb, GFP_ATOMIC);
626 if (!skb) {
627 macsec_txsa_put(tx_sa);
628 return ERR_PTR(-ENOMEM);
629 }
630 }
631
632 unprotected_len = skb->len;
633 eth = eth_hdr(skb);
634 sci_present = macsec_send_sci(secy);
635 hh = skb_push(skb, macsec_extra_len(sci_present));
636 memmove(hh, eth, 2 * ETH_ALEN);
637
638 pn = tx_sa_update_pn(tx_sa, secy);
639 if (pn.full64 == 0) {
640 macsec_txsa_put(tx_sa);
641 kfree_skb(skb);
642 return ERR_PTR(-ENOLINK);
643 }
644 macsec_fill_sectag(hh, secy, pn.lower, sci_present);
645 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
646
647 skb_put(skb, secy->icv_len);
648
649 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
650 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
651
652 u64_stats_update_begin(&secy_stats->syncp);
653 secy_stats->stats.OutPktsTooLong++;
654 u64_stats_update_end(&secy_stats->syncp);
655
656 macsec_txsa_put(tx_sa);
657 kfree_skb(skb);
658 return ERR_PTR(-EINVAL);
659 }
660
661 ret = skb_cow_data(skb, 0, &trailer);
662 if (unlikely(ret < 0)) {
663 macsec_txsa_put(tx_sa);
664 kfree_skb(skb);
665 return ERR_PTR(ret);
666 }
667
668 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
669 if (!req) {
670 macsec_txsa_put(tx_sa);
671 kfree_skb(skb);
672 return ERR_PTR(-ENOMEM);
673 }
674
675 if (secy->xpn)
676 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt);
677 else
678 macsec_fill_iv(iv, secy->sci, pn.lower);
679
680 sg_init_table(sg, ret);
681 ret = skb_to_sgvec(skb, sg, 0, skb->len);
682 if (unlikely(ret < 0)) {
683 aead_request_free(req);
684 macsec_txsa_put(tx_sa);
685 kfree_skb(skb);
686 return ERR_PTR(ret);
687 }
688
689 if (tx_sc->encrypt) {
690 int len = skb->len - macsec_hdr_len(sci_present) -
691 secy->icv_len;
692 aead_request_set_crypt(req, sg, sg, len, iv);
693 aead_request_set_ad(req, macsec_hdr_len(sci_present));
694 } else {
695 aead_request_set_crypt(req, sg, sg, 0, iv);
696 aead_request_set_ad(req, skb->len - secy->icv_len);
697 }
698
699 macsec_skb_cb(skb)->req = req;
700 macsec_skb_cb(skb)->tx_sa = tx_sa;
701 macsec_skb_cb(skb)->has_sci = sci_present;
702 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
703
704 dev_hold(skb->dev);
705 ret = crypto_aead_encrypt(req);
706 if (ret == -EINPROGRESS) {
707 return ERR_PTR(ret);
708 } else if (ret != 0) {
709 dev_put(skb->dev);
710 kfree_skb(skb);
711 aead_request_free(req);
712 macsec_txsa_put(tx_sa);
713 return ERR_PTR(-EINVAL);
714 }
715
716 dev_put(skb->dev);
717 aead_request_free(req);
718 macsec_txsa_put(tx_sa);
719
720 return skb;
721}
722
723static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
724{
725 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
726 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
727 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
728 u32 lowest_pn = 0;
729
730 spin_lock(&rx_sa->lock);
731 if (rx_sa->next_pn_halves.lower >= secy->replay_window)
732 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
733
734 /* Now perform replay protection check again
735 * (see IEEE 802.1AE-2006 figure 10-5)
736 */
737 if (secy->replay_protect && pn < lowest_pn &&
738 (!secy->xpn || pn_same_half(pn, lowest_pn))) {
739 spin_unlock(&rx_sa->lock);
740 u64_stats_update_begin(&rxsc_stats->syncp);
741 rxsc_stats->stats.InPktsLate++;
742 u64_stats_update_end(&rxsc_stats->syncp);
743 DEV_STATS_INC(secy->netdev, rx_dropped);
744 return false;
745 }
746
747 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
748 unsigned int msdu_len = macsec_msdu_len(skb);
749 u64_stats_update_begin(&rxsc_stats->syncp);
750 if (hdr->tci_an & MACSEC_TCI_E)
751 rxsc_stats->stats.InOctetsDecrypted += msdu_len;
752 else
753 rxsc_stats->stats.InOctetsValidated += msdu_len;
754 u64_stats_update_end(&rxsc_stats->syncp);
755 }
756
757 if (!macsec_skb_cb(skb)->valid) {
758 spin_unlock(&rx_sa->lock);
759
760 /* 10.6.5 */
761 if (hdr->tci_an & MACSEC_TCI_C ||
762 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
763 u64_stats_update_begin(&rxsc_stats->syncp);
764 rxsc_stats->stats.InPktsNotValid++;
765 u64_stats_update_end(&rxsc_stats->syncp);
766 this_cpu_inc(rx_sa->stats->InPktsNotValid);
767 DEV_STATS_INC(secy->netdev, rx_errors);
768 return false;
769 }
770
771 u64_stats_update_begin(&rxsc_stats->syncp);
772 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
773 rxsc_stats->stats.InPktsInvalid++;
774 this_cpu_inc(rx_sa->stats->InPktsInvalid);
775 } else if (pn < lowest_pn) {
776 rxsc_stats->stats.InPktsDelayed++;
777 } else {
778 rxsc_stats->stats.InPktsUnchecked++;
779 }
780 u64_stats_update_end(&rxsc_stats->syncp);
781 } else {
782 u64_stats_update_begin(&rxsc_stats->syncp);
783 if (pn < lowest_pn) {
784 rxsc_stats->stats.InPktsDelayed++;
785 } else {
786 rxsc_stats->stats.InPktsOK++;
787 this_cpu_inc(rx_sa->stats->InPktsOK);
788 }
789 u64_stats_update_end(&rxsc_stats->syncp);
790
791 // Instead of "pn >=" - to support pn overflow in xpn
792 if (pn + 1 > rx_sa->next_pn_halves.lower) {
793 rx_sa->next_pn_halves.lower = pn + 1;
794 } else if (secy->xpn &&
795 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
796 rx_sa->next_pn_halves.upper++;
797 rx_sa->next_pn_halves.lower = pn + 1;
798 }
799
800 spin_unlock(&rx_sa->lock);
801 }
802
803 return true;
804}
805
806static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
807{
808 skb->pkt_type = PACKET_HOST;
809 skb->protocol = eth_type_trans(skb, dev);
810
811 skb_reset_network_header(skb);
812 if (!skb_transport_header_was_set(skb))
813 skb_reset_transport_header(skb);
814 skb_reset_mac_len(skb);
815}
816
817static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
818{
819 skb->ip_summed = CHECKSUM_NONE;
820 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
821 skb_pull(skb, hdr_len);
822 pskb_trim_unique(skb, skb->len - icv_len);
823}
824
825static void count_rx(struct net_device *dev, int len)
826{
827 dev_sw_netstats_rx_add(dev, len);
828}
829
830static void macsec_decrypt_done(void *data, int err)
831{
832 struct sk_buff *skb = data;
833 struct net_device *dev = skb->dev;
834 struct macsec_dev *macsec = macsec_priv(dev);
835 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
836 struct macsec_rx_sc *rx_sc = rx_sa->sc;
837 int len;
838 u32 pn;
839
840 aead_request_free(macsec_skb_cb(skb)->req);
841
842 if (!err)
843 macsec_skb_cb(skb)->valid = true;
844
845 rcu_read_lock_bh();
846 pn = ntohl(macsec_ethhdr(skb)->packet_number);
847 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
848 rcu_read_unlock_bh();
849 kfree_skb(skb);
850 goto out;
851 }
852
853 macsec_finalize_skb(skb, macsec->secy.icv_len,
854 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
855 len = skb->len;
856 macsec_reset_skb(skb, macsec->secy.netdev);
857
858 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
859 count_rx(dev, len);
860
861 rcu_read_unlock_bh();
862
863out:
864 macsec_rxsa_put(rx_sa);
865 macsec_rxsc_put(rx_sc);
866 dev_put(dev);
867}
868
869static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
870 struct net_device *dev,
871 struct macsec_rx_sa *rx_sa,
872 sci_t sci,
873 struct macsec_secy *secy)
874{
875 int ret;
876 struct scatterlist *sg;
877 struct sk_buff *trailer;
878 unsigned char *iv;
879 struct aead_request *req;
880 struct macsec_eth_header *hdr;
881 u32 hdr_pn;
882 u16 icv_len = secy->icv_len;
883
884 macsec_skb_cb(skb)->valid = false;
885 skb = skb_share_check(skb, GFP_ATOMIC);
886 if (!skb)
887 return ERR_PTR(-ENOMEM);
888
889 ret = skb_cow_data(skb, 0, &trailer);
890 if (unlikely(ret < 0)) {
891 kfree_skb(skb);
892 return ERR_PTR(ret);
893 }
894 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
895 if (!req) {
896 kfree_skb(skb);
897 return ERR_PTR(-ENOMEM);
898 }
899
900 hdr = (struct macsec_eth_header *)skb->data;
901 hdr_pn = ntohl(hdr->packet_number);
902
903 if (secy->xpn) {
904 pn_t recovered_pn = rx_sa->next_pn_halves;
905
906 recovered_pn.lower = hdr_pn;
907 if (hdr_pn < rx_sa->next_pn_halves.lower &&
908 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
909 recovered_pn.upper++;
910
911 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
912 rx_sa->key.salt);
913 } else {
914 macsec_fill_iv(iv, sci, hdr_pn);
915 }
916
917 sg_init_table(sg, ret);
918 ret = skb_to_sgvec(skb, sg, 0, skb->len);
919 if (unlikely(ret < 0)) {
920 aead_request_free(req);
921 kfree_skb(skb);
922 return ERR_PTR(ret);
923 }
924
925 if (hdr->tci_an & MACSEC_TCI_E) {
926 /* confidentiality: ethernet + macsec header
927 * authenticated, encrypted payload
928 */
929 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
930
931 aead_request_set_crypt(req, sg, sg, len, iv);
932 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
933 skb = skb_unshare(skb, GFP_ATOMIC);
934 if (!skb) {
935 aead_request_free(req);
936 return ERR_PTR(-ENOMEM);
937 }
938 } else {
939 /* integrity only: all headers + data authenticated */
940 aead_request_set_crypt(req, sg, sg, icv_len, iv);
941 aead_request_set_ad(req, skb->len - icv_len);
942 }
943
944 macsec_skb_cb(skb)->req = req;
945 skb->dev = dev;
946 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
947
948 dev_hold(dev);
949 ret = crypto_aead_decrypt(req);
950 if (ret == -EINPROGRESS) {
951 return ERR_PTR(ret);
952 } else if (ret != 0) {
953 /* decryption/authentication failed
954 * 10.6 if validateFrames is disabled, deliver anyway
955 */
956 if (ret != -EBADMSG) {
957 kfree_skb(skb);
958 skb = ERR_PTR(ret);
959 }
960 } else {
961 macsec_skb_cb(skb)->valid = true;
962 }
963 dev_put(dev);
964
965 aead_request_free(req);
966
967 return skb;
968}
969
970static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
971{
972 struct macsec_rx_sc *rx_sc;
973
974 for_each_rxsc(secy, rx_sc) {
975 if (rx_sc->sci == sci)
976 return rx_sc;
977 }
978
979 return NULL;
980}
981
982static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
983{
984 struct macsec_rx_sc *rx_sc;
985
986 for_each_rxsc_rtnl(secy, rx_sc) {
987 if (rx_sc->sci == sci)
988 return rx_sc;
989 }
990
991 return NULL;
992}
993
994static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
995{
996 /* Deliver to the uncontrolled port by default */
997 enum rx_handler_result ret = RX_HANDLER_PASS;
998 struct ethhdr *hdr = eth_hdr(skb);
999 struct metadata_dst *md_dst;
1000 struct macsec_rxh_data *rxd;
1001 struct macsec_dev *macsec;
1002 bool is_macsec_md_dst;
1003
1004 rcu_read_lock();
1005 rxd = macsec_data_rcu(skb->dev);
1006 md_dst = skb_metadata_dst(skb);
1007 is_macsec_md_dst = md_dst && md_dst->type == METADATA_MACSEC;
1008
1009 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1010 struct sk_buff *nskb;
1011 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1012 struct net_device *ndev = macsec->secy.netdev;
1013
1014 /* If h/w offloading is enabled, HW decodes frames and strips
1015 * the SecTAG, so we have to deduce which port to deliver to.
1016 */
1017 if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
1018 const struct macsec_ops *ops;
1019
1020 ops = macsec_get_ops(macsec, NULL);
1021
1022 if (ops->rx_uses_md_dst && !is_macsec_md_dst)
1023 continue;
1024
1025 if (is_macsec_md_dst) {
1026 struct macsec_rx_sc *rx_sc;
1027
1028 /* All drivers that implement MACsec offload
1029 * support using skb metadata destinations must
1030 * indicate that they do so.
1031 */
1032 DEBUG_NET_WARN_ON_ONCE(!ops->rx_uses_md_dst);
1033 rx_sc = find_rx_sc(&macsec->secy,
1034 md_dst->u.macsec_info.sci);
1035 if (!rx_sc)
1036 continue;
1037 /* device indicated macsec offload occurred */
1038 skb->dev = ndev;
1039 skb->pkt_type = PACKET_HOST;
1040 eth_skb_pkt_type(skb, ndev);
1041 ret = RX_HANDLER_ANOTHER;
1042 goto out;
1043 }
1044
1045 /* This datapath is insecure because it is unable to
1046 * enforce isolation of broadcast/multicast traffic and
1047 * unicast traffic with promiscuous mode on the macsec
1048 * netdev. Since the core stack has no mechanism to
1049 * check that the hardware did indeed receive MACsec
1050 * traffic, it is possible that the response handling
1051 * done by the MACsec port was to a plaintext packet.
1052 * This violates the MACsec protocol standard.
1053 */
1054 if (ether_addr_equal_64bits(hdr->h_dest,
1055 ndev->dev_addr)) {
1056 /* exact match, divert skb to this port */
1057 skb->dev = ndev;
1058 skb->pkt_type = PACKET_HOST;
1059 ret = RX_HANDLER_ANOTHER;
1060 goto out;
1061 } else if (is_multicast_ether_addr_64bits(
1062 hdr->h_dest)) {
1063 /* multicast frame, deliver on this port too */
1064 nskb = skb_clone(skb, GFP_ATOMIC);
1065 if (!nskb)
1066 break;
1067
1068 nskb->dev = ndev;
1069 eth_skb_pkt_type(nskb, ndev);
1070
1071 __netif_rx(nskb);
1072 } else if (ndev->flags & IFF_PROMISC) {
1073 skb->dev = ndev;
1074 skb->pkt_type = PACKET_HOST;
1075 ret = RX_HANDLER_ANOTHER;
1076 goto out;
1077 }
1078
1079 continue;
1080 }
1081
1082 /* 10.6 If the management control validateFrames is not
1083 * Strict, frames without a SecTAG are received, counted, and
1084 * delivered to the Controlled Port
1085 */
1086 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1087 u64_stats_update_begin(&secy_stats->syncp);
1088 secy_stats->stats.InPktsNoTag++;
1089 u64_stats_update_end(&secy_stats->syncp);
1090 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1091 continue;
1092 }
1093
1094 /* deliver on this port */
1095 nskb = skb_clone(skb, GFP_ATOMIC);
1096 if (!nskb)
1097 break;
1098
1099 nskb->dev = ndev;
1100
1101 if (__netif_rx(nskb) == NET_RX_SUCCESS) {
1102 u64_stats_update_begin(&secy_stats->syncp);
1103 secy_stats->stats.InPktsUntagged++;
1104 u64_stats_update_end(&secy_stats->syncp);
1105 }
1106 }
1107
1108out:
1109 rcu_read_unlock();
1110 return ret;
1111}
1112
1113static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1114{
1115 struct sk_buff *skb = *pskb;
1116 struct net_device *dev = skb->dev;
1117 struct macsec_eth_header *hdr;
1118 struct macsec_secy *secy = NULL;
1119 struct macsec_rx_sc *rx_sc;
1120 struct macsec_rx_sa *rx_sa;
1121 struct macsec_rxh_data *rxd;
1122 struct macsec_dev *macsec;
1123 unsigned int len;
1124 sci_t sci;
1125 u32 hdr_pn;
1126 bool cbit;
1127 struct pcpu_rx_sc_stats *rxsc_stats;
1128 struct pcpu_secy_stats *secy_stats;
1129 bool pulled_sci;
1130 int ret;
1131
1132 if (skb_headroom(skb) < ETH_HLEN)
1133 goto drop_direct;
1134
1135 hdr = macsec_ethhdr(skb);
1136 if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
1137 return handle_not_macsec(skb);
1138
1139 skb = skb_unshare(skb, GFP_ATOMIC);
1140 *pskb = skb;
1141 if (!skb)
1142 return RX_HANDLER_CONSUMED;
1143
1144 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1145 if (!pulled_sci) {
1146 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1147 goto drop_direct;
1148 }
1149
1150 hdr = macsec_ethhdr(skb);
1151
1152 /* Frames with a SecTAG that has the TCI E bit set but the C
1153 * bit clear are discarded, as this reserved encoding is used
1154 * to identify frames with a SecTAG that are not to be
1155 * delivered to the Controlled Port.
1156 */
1157 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1158 return RX_HANDLER_PASS;
1159
1160 /* now, pull the extra length */
1161 if (hdr->tci_an & MACSEC_TCI_SC) {
1162 if (!pulled_sci)
1163 goto drop_direct;
1164 }
1165
1166 /* ethernet header is part of crypto processing */
1167 skb_push(skb, ETH_HLEN);
1168
1169 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1170 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1171 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1172
1173 rcu_read_lock();
1174 rxd = macsec_data_rcu(skb->dev);
1175
1176 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1177 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1178
1179 sc = sc ? macsec_rxsc_get(sc) : NULL;
1180
1181 if (sc) {
1182 secy = &macsec->secy;
1183 rx_sc = sc;
1184 break;
1185 }
1186 }
1187
1188 if (!secy)
1189 goto nosci;
1190
1191 dev = secy->netdev;
1192 macsec = macsec_priv(dev);
1193 secy_stats = this_cpu_ptr(macsec->stats);
1194 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1195
1196 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
1197 u64_stats_update_begin(&secy_stats->syncp);
1198 secy_stats->stats.InPktsBadTag++;
1199 u64_stats_update_end(&secy_stats->syncp);
1200 DEV_STATS_INC(secy->netdev, rx_errors);
1201 goto drop_nosa;
1202 }
1203
1204 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1205 if (!rx_sa) {
1206 /* 10.6.1 if the SA is not in use */
1207
1208 /* If validateFrames is Strict or the C bit in the
1209 * SecTAG is set, discard
1210 */
1211 struct macsec_rx_sa *active_rx_sa = macsec_active_rxsa_get(rx_sc);
1212 if (hdr->tci_an & MACSEC_TCI_C ||
1213 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1214 u64_stats_update_begin(&rxsc_stats->syncp);
1215 rxsc_stats->stats.InPktsNotUsingSA++;
1216 u64_stats_update_end(&rxsc_stats->syncp);
1217 DEV_STATS_INC(secy->netdev, rx_errors);
1218 if (active_rx_sa)
1219 this_cpu_inc(active_rx_sa->stats->InPktsNotUsingSA);
1220 goto drop_nosa;
1221 }
1222
1223 /* not Strict, the frame (with the SecTAG and ICV
1224 * removed) is delivered to the Controlled Port.
1225 */
1226 u64_stats_update_begin(&rxsc_stats->syncp);
1227 rxsc_stats->stats.InPktsUnusedSA++;
1228 u64_stats_update_end(&rxsc_stats->syncp);
1229 if (active_rx_sa)
1230 this_cpu_inc(active_rx_sa->stats->InPktsUnusedSA);
1231 goto deliver;
1232 }
1233
1234 /* First, PN check to avoid decrypting obviously wrong packets */
1235 hdr_pn = ntohl(hdr->packet_number);
1236 if (secy->replay_protect) {
1237 bool late;
1238
1239 spin_lock(&rx_sa->lock);
1240 late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
1241 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
1242
1243 if (secy->xpn)
1244 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
1245 spin_unlock(&rx_sa->lock);
1246
1247 if (late) {
1248 u64_stats_update_begin(&rxsc_stats->syncp);
1249 rxsc_stats->stats.InPktsLate++;
1250 u64_stats_update_end(&rxsc_stats->syncp);
1251 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1252 goto drop;
1253 }
1254 }
1255
1256 macsec_skb_cb(skb)->rx_sa = rx_sa;
1257
1258 /* Disabled && !changed text => skip validation */
1259 if (hdr->tci_an & MACSEC_TCI_C ||
1260 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1261 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1262
1263 if (IS_ERR(skb)) {
1264 /* the decrypt callback needs the reference */
1265 if (PTR_ERR(skb) != -EINPROGRESS) {
1266 macsec_rxsa_put(rx_sa);
1267 macsec_rxsc_put(rx_sc);
1268 }
1269 rcu_read_unlock();
1270 *pskb = NULL;
1271 return RX_HANDLER_CONSUMED;
1272 }
1273
1274 if (!macsec_post_decrypt(skb, secy, hdr_pn))
1275 goto drop;
1276
1277deliver:
1278 macsec_finalize_skb(skb, secy->icv_len,
1279 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1280 len = skb->len;
1281 macsec_reset_skb(skb, secy->netdev);
1282
1283 if (rx_sa)
1284 macsec_rxsa_put(rx_sa);
1285 macsec_rxsc_put(rx_sc);
1286
1287 skb_orphan(skb);
1288 ret = gro_cells_receive(&macsec->gro_cells, skb);
1289 if (ret == NET_RX_SUCCESS)
1290 count_rx(dev, len);
1291 else
1292 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1293
1294 rcu_read_unlock();
1295
1296 *pskb = NULL;
1297 return RX_HANDLER_CONSUMED;
1298
1299drop:
1300 macsec_rxsa_put(rx_sa);
1301drop_nosa:
1302 macsec_rxsc_put(rx_sc);
1303 rcu_read_unlock();
1304drop_direct:
1305 kfree_skb(skb);
1306 *pskb = NULL;
1307 return RX_HANDLER_CONSUMED;
1308
1309nosci:
1310 /* 10.6.1 if the SC is not found */
1311 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1312 if (!cbit)
1313 macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN,
1314 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1315
1316 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1317 struct sk_buff *nskb;
1318
1319 secy_stats = this_cpu_ptr(macsec->stats);
1320
1321 /* If validateFrames is Strict or the C bit in the
1322 * SecTAG is set, discard
1323 */
1324 if (cbit ||
1325 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1326 u64_stats_update_begin(&secy_stats->syncp);
1327 secy_stats->stats.InPktsNoSCI++;
1328 u64_stats_update_end(&secy_stats->syncp);
1329 DEV_STATS_INC(macsec->secy.netdev, rx_errors);
1330 continue;
1331 }
1332
1333 /* not strict, the frame (with the SecTAG and ICV
1334 * removed) is delivered to the Controlled Port.
1335 */
1336 nskb = skb_clone(skb, GFP_ATOMIC);
1337 if (!nskb)
1338 break;
1339
1340 macsec_reset_skb(nskb, macsec->secy.netdev);
1341
1342 ret = __netif_rx(nskb);
1343 if (ret == NET_RX_SUCCESS) {
1344 u64_stats_update_begin(&secy_stats->syncp);
1345 secy_stats->stats.InPktsUnknownSCI++;
1346 u64_stats_update_end(&secy_stats->syncp);
1347 } else {
1348 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1349 }
1350 }
1351
1352 rcu_read_unlock();
1353 *pskb = skb;
1354 return RX_HANDLER_PASS;
1355}
1356
1357static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1358{
1359 struct crypto_aead *tfm;
1360 int ret;
1361
1362 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1363
1364 if (IS_ERR(tfm))
1365 return tfm;
1366
1367 ret = crypto_aead_setkey(tfm, key, key_len);
1368 if (ret < 0)
1369 goto fail;
1370
1371 ret = crypto_aead_setauthsize(tfm, icv_len);
1372 if (ret < 0)
1373 goto fail;
1374
1375 return tfm;
1376fail:
1377 crypto_free_aead(tfm);
1378 return ERR_PTR(ret);
1379}
1380
1381static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1382 int icv_len)
1383{
1384 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1385 if (!rx_sa->stats)
1386 return -ENOMEM;
1387
1388 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1389 if (IS_ERR(rx_sa->key.tfm)) {
1390 free_percpu(rx_sa->stats);
1391 return PTR_ERR(rx_sa->key.tfm);
1392 }
1393
1394 rx_sa->ssci = MACSEC_UNDEF_SSCI;
1395 rx_sa->active = false;
1396 rx_sa->next_pn = 1;
1397 refcount_set(&rx_sa->refcnt, 1);
1398 spin_lock_init(&rx_sa->lock);
1399
1400 return 0;
1401}
1402
1403static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1404{
1405 rx_sa->active = false;
1406
1407 macsec_rxsa_put(rx_sa);
1408}
1409
1410static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1411{
1412 int i;
1413
1414 for (i = 0; i < MACSEC_NUM_AN; i++) {
1415 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1416
1417 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1418 if (sa)
1419 clear_rx_sa(sa);
1420 }
1421
1422 macsec_rxsc_put(rx_sc);
1423}
1424
1425static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1426{
1427 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1428
1429 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1430 rx_sc;
1431 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1432 if (rx_sc->sci == sci) {
1433 if (rx_sc->active)
1434 secy->n_rx_sc--;
1435 rcu_assign_pointer(*rx_scp, rx_sc->next);
1436 return rx_sc;
1437 }
1438 }
1439
1440 return NULL;
1441}
1442
1443static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci,
1444 bool active)
1445{
1446 struct macsec_rx_sc *rx_sc;
1447 struct macsec_dev *macsec;
1448 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1449 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1450 struct macsec_secy *secy;
1451
1452 list_for_each_entry(macsec, &rxd->secys, secys) {
1453 if (find_rx_sc_rtnl(&macsec->secy, sci))
1454 return ERR_PTR(-EEXIST);
1455 }
1456
1457 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1458 if (!rx_sc)
1459 return ERR_PTR(-ENOMEM);
1460
1461 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1462 if (!rx_sc->stats) {
1463 kfree(rx_sc);
1464 return ERR_PTR(-ENOMEM);
1465 }
1466
1467 rx_sc->sci = sci;
1468 rx_sc->active = active;
1469 refcount_set(&rx_sc->refcnt, 1);
1470
1471 secy = &macsec_priv(dev)->secy;
1472 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1473 rcu_assign_pointer(secy->rx_sc, rx_sc);
1474
1475 if (rx_sc->active)
1476 secy->n_rx_sc++;
1477
1478 return rx_sc;
1479}
1480
1481static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1482 int icv_len)
1483{
1484 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1485 if (!tx_sa->stats)
1486 return -ENOMEM;
1487
1488 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1489 if (IS_ERR(tx_sa->key.tfm)) {
1490 free_percpu(tx_sa->stats);
1491 return PTR_ERR(tx_sa->key.tfm);
1492 }
1493
1494 tx_sa->ssci = MACSEC_UNDEF_SSCI;
1495 tx_sa->active = false;
1496 refcount_set(&tx_sa->refcnt, 1);
1497 spin_lock_init(&tx_sa->lock);
1498
1499 return 0;
1500}
1501
1502static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1503{
1504 tx_sa->active = false;
1505
1506 macsec_txsa_put(tx_sa);
1507}
1508
1509static struct genl_family macsec_fam;
1510
1511static struct net_device *get_dev_from_nl(struct net *net,
1512 struct nlattr **attrs)
1513{
1514 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1515 struct net_device *dev;
1516
1517 dev = __dev_get_by_index(net, ifindex);
1518 if (!dev)
1519 return ERR_PTR(-ENODEV);
1520
1521 if (!netif_is_macsec(dev))
1522 return ERR_PTR(-ENODEV);
1523
1524 return dev;
1525}
1526
1527static enum macsec_offload nla_get_offload(const struct nlattr *nla)
1528{
1529 return (__force enum macsec_offload)nla_get_u8(nla);
1530}
1531
1532static sci_t nla_get_sci(const struct nlattr *nla)
1533{
1534 return (__force sci_t)nla_get_u64(nla);
1535}
1536
1537static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1538 int padattr)
1539{
1540 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1541}
1542
1543static ssci_t nla_get_ssci(const struct nlattr *nla)
1544{
1545 return (__force ssci_t)nla_get_u32(nla);
1546}
1547
1548static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
1549{
1550 return nla_put_u32(skb, attrtype, (__force u64)value);
1551}
1552
1553static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1554 struct nlattr **attrs,
1555 struct nlattr **tb_sa,
1556 struct net_device **devp,
1557 struct macsec_secy **secyp,
1558 struct macsec_tx_sc **scp,
1559 u8 *assoc_num)
1560{
1561 struct net_device *dev;
1562 struct macsec_secy *secy;
1563 struct macsec_tx_sc *tx_sc;
1564 struct macsec_tx_sa *tx_sa;
1565
1566 if (!tb_sa[MACSEC_SA_ATTR_AN])
1567 return ERR_PTR(-EINVAL);
1568
1569 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1570
1571 dev = get_dev_from_nl(net, attrs);
1572 if (IS_ERR(dev))
1573 return ERR_CAST(dev);
1574
1575 if (*assoc_num >= MACSEC_NUM_AN)
1576 return ERR_PTR(-EINVAL);
1577
1578 secy = &macsec_priv(dev)->secy;
1579 tx_sc = &secy->tx_sc;
1580
1581 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1582 if (!tx_sa)
1583 return ERR_PTR(-ENODEV);
1584
1585 *devp = dev;
1586 *scp = tx_sc;
1587 *secyp = secy;
1588 return tx_sa;
1589}
1590
1591static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1592 struct nlattr **attrs,
1593 struct nlattr **tb_rxsc,
1594 struct net_device **devp,
1595 struct macsec_secy **secyp)
1596{
1597 struct net_device *dev;
1598 struct macsec_secy *secy;
1599 struct macsec_rx_sc *rx_sc;
1600 sci_t sci;
1601
1602 dev = get_dev_from_nl(net, attrs);
1603 if (IS_ERR(dev))
1604 return ERR_CAST(dev);
1605
1606 secy = &macsec_priv(dev)->secy;
1607
1608 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1609 return ERR_PTR(-EINVAL);
1610
1611 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1612 rx_sc = find_rx_sc_rtnl(secy, sci);
1613 if (!rx_sc)
1614 return ERR_PTR(-ENODEV);
1615
1616 *secyp = secy;
1617 *devp = dev;
1618
1619 return rx_sc;
1620}
1621
1622static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1623 struct nlattr **attrs,
1624 struct nlattr **tb_rxsc,
1625 struct nlattr **tb_sa,
1626 struct net_device **devp,
1627 struct macsec_secy **secyp,
1628 struct macsec_rx_sc **scp,
1629 u8 *assoc_num)
1630{
1631 struct macsec_rx_sc *rx_sc;
1632 struct macsec_rx_sa *rx_sa;
1633
1634 if (!tb_sa[MACSEC_SA_ATTR_AN])
1635 return ERR_PTR(-EINVAL);
1636
1637 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1638 if (*assoc_num >= MACSEC_NUM_AN)
1639 return ERR_PTR(-EINVAL);
1640
1641 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1642 if (IS_ERR(rx_sc))
1643 return ERR_CAST(rx_sc);
1644
1645 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1646 if (!rx_sa)
1647 return ERR_PTR(-ENODEV);
1648
1649 *scp = rx_sc;
1650 return rx_sa;
1651}
1652
1653static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1654 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1655 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1656 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1657 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1658};
1659
1660static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1661 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1662 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1663};
1664
1665static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1666 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1667 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1668 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4),
1669 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1670 .len = MACSEC_KEYID_LEN, },
1671 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1672 .len = MACSEC_MAX_KEY_LEN, },
1673 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
1674 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
1675 .len = MACSEC_SALT_LEN, },
1676};
1677
1678static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
1679 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
1680};
1681
1682/* Offloads an operation to a device driver */
1683static int macsec_offload(int (* const func)(struct macsec_context *),
1684 struct macsec_context *ctx)
1685{
1686 int ret;
1687
1688 if (unlikely(!func))
1689 return 0;
1690
1691 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1692 mutex_lock(&ctx->phydev->lock);
1693
1694 ret = (*func)(ctx);
1695
1696 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1697 mutex_unlock(&ctx->phydev->lock);
1698
1699 return ret;
1700}
1701
1702static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1703{
1704 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1705 return -EINVAL;
1706
1707 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1708 return -EINVAL;
1709
1710 return 0;
1711}
1712
1713static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1714{
1715 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1716 return -EINVAL;
1717
1718 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1719 return -EINVAL;
1720
1721 return 0;
1722}
1723
1724static bool validate_add_rxsa(struct nlattr **attrs)
1725{
1726 if (!attrs[MACSEC_SA_ATTR_AN] ||
1727 !attrs[MACSEC_SA_ATTR_KEY] ||
1728 !attrs[MACSEC_SA_ATTR_KEYID])
1729 return false;
1730
1731 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1732 return false;
1733
1734 if (attrs[MACSEC_SA_ATTR_PN] &&
1735 nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1736 return false;
1737
1738 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1739 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1740 return false;
1741 }
1742
1743 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1744 return false;
1745
1746 return true;
1747}
1748
1749static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1750{
1751 struct net_device *dev;
1752 struct nlattr **attrs = info->attrs;
1753 struct macsec_secy *secy;
1754 struct macsec_rx_sc *rx_sc;
1755 struct macsec_rx_sa *rx_sa;
1756 unsigned char assoc_num;
1757 int pn_len;
1758 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1759 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1760 int err;
1761
1762 if (!attrs[MACSEC_ATTR_IFINDEX])
1763 return -EINVAL;
1764
1765 if (parse_sa_config(attrs, tb_sa))
1766 return -EINVAL;
1767
1768 if (parse_rxsc_config(attrs, tb_rxsc))
1769 return -EINVAL;
1770
1771 if (!validate_add_rxsa(tb_sa))
1772 return -EINVAL;
1773
1774 rtnl_lock();
1775 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1776 if (IS_ERR(rx_sc)) {
1777 rtnl_unlock();
1778 return PTR_ERR(rx_sc);
1779 }
1780
1781 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1782
1783 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1784 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1785 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1786 rtnl_unlock();
1787 return -EINVAL;
1788 }
1789
1790 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1791 if (tb_sa[MACSEC_SA_ATTR_PN] &&
1792 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1793 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
1794 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1795 rtnl_unlock();
1796 return -EINVAL;
1797 }
1798
1799 if (secy->xpn) {
1800 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
1801 rtnl_unlock();
1802 return -EINVAL;
1803 }
1804
1805 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
1806 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
1807 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
1808 MACSEC_SALT_LEN);
1809 rtnl_unlock();
1810 return -EINVAL;
1811 }
1812 }
1813
1814 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1815 if (rx_sa) {
1816 rtnl_unlock();
1817 return -EBUSY;
1818 }
1819
1820 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1821 if (!rx_sa) {
1822 rtnl_unlock();
1823 return -ENOMEM;
1824 }
1825
1826 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1827 secy->key_len, secy->icv_len);
1828 if (err < 0) {
1829 kfree(rx_sa);
1830 rtnl_unlock();
1831 return err;
1832 }
1833
1834 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1835 spin_lock_bh(&rx_sa->lock);
1836 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
1837 spin_unlock_bh(&rx_sa->lock);
1838 }
1839
1840 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1841 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1842
1843 rx_sa->sc = rx_sc;
1844
1845 if (secy->xpn) {
1846 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
1847 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
1848 MACSEC_SALT_LEN);
1849 }
1850
1851 /* If h/w offloading is available, propagate to the device */
1852 if (macsec_is_offloaded(netdev_priv(dev))) {
1853 const struct macsec_ops *ops;
1854 struct macsec_context ctx;
1855
1856 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1857 if (!ops) {
1858 err = -EOPNOTSUPP;
1859 goto cleanup;
1860 }
1861
1862 ctx.sa.assoc_num = assoc_num;
1863 ctx.sa.rx_sa = rx_sa;
1864 ctx.secy = secy;
1865 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1866 secy->key_len);
1867
1868 err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1869 memzero_explicit(ctx.sa.key, secy->key_len);
1870 if (err)
1871 goto cleanup;
1872 }
1873
1874 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1875 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1876
1877 rtnl_unlock();
1878
1879 return 0;
1880
1881cleanup:
1882 macsec_rxsa_put(rx_sa);
1883 rtnl_unlock();
1884 return err;
1885}
1886
1887static bool validate_add_rxsc(struct nlattr **attrs)
1888{
1889 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1890 return false;
1891
1892 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1893 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1894 return false;
1895 }
1896
1897 return true;
1898}
1899
1900static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1901{
1902 struct net_device *dev;
1903 sci_t sci = MACSEC_UNDEF_SCI;
1904 struct nlattr **attrs = info->attrs;
1905 struct macsec_rx_sc *rx_sc;
1906 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1907 struct macsec_secy *secy;
1908 bool active = true;
1909 int ret;
1910
1911 if (!attrs[MACSEC_ATTR_IFINDEX])
1912 return -EINVAL;
1913
1914 if (parse_rxsc_config(attrs, tb_rxsc))
1915 return -EINVAL;
1916
1917 if (!validate_add_rxsc(tb_rxsc))
1918 return -EINVAL;
1919
1920 rtnl_lock();
1921 dev = get_dev_from_nl(genl_info_net(info), attrs);
1922 if (IS_ERR(dev)) {
1923 rtnl_unlock();
1924 return PTR_ERR(dev);
1925 }
1926
1927 secy = &macsec_priv(dev)->secy;
1928 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1929
1930 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1931 active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1932
1933 rx_sc = create_rx_sc(dev, sci, active);
1934 if (IS_ERR(rx_sc)) {
1935 rtnl_unlock();
1936 return PTR_ERR(rx_sc);
1937 }
1938
1939 if (macsec_is_offloaded(netdev_priv(dev))) {
1940 const struct macsec_ops *ops;
1941 struct macsec_context ctx;
1942
1943 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1944 if (!ops) {
1945 ret = -EOPNOTSUPP;
1946 goto cleanup;
1947 }
1948
1949 ctx.rx_sc = rx_sc;
1950 ctx.secy = secy;
1951
1952 ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1953 if (ret)
1954 goto cleanup;
1955 }
1956
1957 rtnl_unlock();
1958
1959 return 0;
1960
1961cleanup:
1962 del_rx_sc(secy, sci);
1963 free_rx_sc(rx_sc);
1964 rtnl_unlock();
1965 return ret;
1966}
1967
1968static bool validate_add_txsa(struct nlattr **attrs)
1969{
1970 if (!attrs[MACSEC_SA_ATTR_AN] ||
1971 !attrs[MACSEC_SA_ATTR_PN] ||
1972 !attrs[MACSEC_SA_ATTR_KEY] ||
1973 !attrs[MACSEC_SA_ATTR_KEYID])
1974 return false;
1975
1976 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1977 return false;
1978
1979 if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1980 return false;
1981
1982 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1983 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1984 return false;
1985 }
1986
1987 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1988 return false;
1989
1990 return true;
1991}
1992
1993static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1994{
1995 struct net_device *dev;
1996 struct nlattr **attrs = info->attrs;
1997 struct macsec_secy *secy;
1998 struct macsec_tx_sc *tx_sc;
1999 struct macsec_tx_sa *tx_sa;
2000 unsigned char assoc_num;
2001 int pn_len;
2002 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2003 bool was_operational;
2004 int err;
2005
2006 if (!attrs[MACSEC_ATTR_IFINDEX])
2007 return -EINVAL;
2008
2009 if (parse_sa_config(attrs, tb_sa))
2010 return -EINVAL;
2011
2012 if (!validate_add_txsa(tb_sa))
2013 return -EINVAL;
2014
2015 rtnl_lock();
2016 dev = get_dev_from_nl(genl_info_net(info), attrs);
2017 if (IS_ERR(dev)) {
2018 rtnl_unlock();
2019 return PTR_ERR(dev);
2020 }
2021
2022 secy = &macsec_priv(dev)->secy;
2023 tx_sc = &secy->tx_sc;
2024
2025 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
2026
2027 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
2028 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
2029 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
2030 rtnl_unlock();
2031 return -EINVAL;
2032 }
2033
2034 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2035 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2036 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
2037 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2038 rtnl_unlock();
2039 return -EINVAL;
2040 }
2041
2042 if (secy->xpn) {
2043 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
2044 rtnl_unlock();
2045 return -EINVAL;
2046 }
2047
2048 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
2049 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
2050 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
2051 MACSEC_SALT_LEN);
2052 rtnl_unlock();
2053 return -EINVAL;
2054 }
2055 }
2056
2057 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
2058 if (tx_sa) {
2059 rtnl_unlock();
2060 return -EBUSY;
2061 }
2062
2063 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
2064 if (!tx_sa) {
2065 rtnl_unlock();
2066 return -ENOMEM;
2067 }
2068
2069 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2070 secy->key_len, secy->icv_len);
2071 if (err < 0) {
2072 kfree(tx_sa);
2073 rtnl_unlock();
2074 return err;
2075 }
2076
2077 spin_lock_bh(&tx_sa->lock);
2078 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2079 spin_unlock_bh(&tx_sa->lock);
2080
2081 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2082 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2083
2084 was_operational = secy->operational;
2085 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
2086 secy->operational = true;
2087
2088 if (secy->xpn) {
2089 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
2090 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
2091 MACSEC_SALT_LEN);
2092 }
2093
2094 /* If h/w offloading is available, propagate to the device */
2095 if (macsec_is_offloaded(netdev_priv(dev))) {
2096 const struct macsec_ops *ops;
2097 struct macsec_context ctx;
2098
2099 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2100 if (!ops) {
2101 err = -EOPNOTSUPP;
2102 goto cleanup;
2103 }
2104
2105 ctx.sa.assoc_num = assoc_num;
2106 ctx.sa.tx_sa = tx_sa;
2107 ctx.secy = secy;
2108 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2109 secy->key_len);
2110
2111 err = macsec_offload(ops->mdo_add_txsa, &ctx);
2112 memzero_explicit(ctx.sa.key, secy->key_len);
2113 if (err)
2114 goto cleanup;
2115 }
2116
2117 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
2118 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
2119
2120 rtnl_unlock();
2121
2122 return 0;
2123
2124cleanup:
2125 secy->operational = was_operational;
2126 macsec_txsa_put(tx_sa);
2127 rtnl_unlock();
2128 return err;
2129}
2130
2131static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
2132{
2133 struct nlattr **attrs = info->attrs;
2134 struct net_device *dev;
2135 struct macsec_secy *secy;
2136 struct macsec_rx_sc *rx_sc;
2137 struct macsec_rx_sa *rx_sa;
2138 u8 assoc_num;
2139 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2140 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2141 int ret;
2142
2143 if (!attrs[MACSEC_ATTR_IFINDEX])
2144 return -EINVAL;
2145
2146 if (parse_sa_config(attrs, tb_sa))
2147 return -EINVAL;
2148
2149 if (parse_rxsc_config(attrs, tb_rxsc))
2150 return -EINVAL;
2151
2152 rtnl_lock();
2153 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2154 &dev, &secy, &rx_sc, &assoc_num);
2155 if (IS_ERR(rx_sa)) {
2156 rtnl_unlock();
2157 return PTR_ERR(rx_sa);
2158 }
2159
2160 if (rx_sa->active) {
2161 rtnl_unlock();
2162 return -EBUSY;
2163 }
2164
2165 /* If h/w offloading is available, propagate to the device */
2166 if (macsec_is_offloaded(netdev_priv(dev))) {
2167 const struct macsec_ops *ops;
2168 struct macsec_context ctx;
2169
2170 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2171 if (!ops) {
2172 ret = -EOPNOTSUPP;
2173 goto cleanup;
2174 }
2175
2176 ctx.sa.assoc_num = assoc_num;
2177 ctx.sa.rx_sa = rx_sa;
2178 ctx.secy = secy;
2179
2180 ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
2181 if (ret)
2182 goto cleanup;
2183 }
2184
2185 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
2186 clear_rx_sa(rx_sa);
2187
2188 rtnl_unlock();
2189
2190 return 0;
2191
2192cleanup:
2193 rtnl_unlock();
2194 return ret;
2195}
2196
2197static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
2198{
2199 struct nlattr **attrs = info->attrs;
2200 struct net_device *dev;
2201 struct macsec_secy *secy;
2202 struct macsec_rx_sc *rx_sc;
2203 sci_t sci;
2204 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2205 int ret;
2206
2207 if (!attrs[MACSEC_ATTR_IFINDEX])
2208 return -EINVAL;
2209
2210 if (parse_rxsc_config(attrs, tb_rxsc))
2211 return -EINVAL;
2212
2213 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
2214 return -EINVAL;
2215
2216 rtnl_lock();
2217 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2218 if (IS_ERR(dev)) {
2219 rtnl_unlock();
2220 return PTR_ERR(dev);
2221 }
2222
2223 secy = &macsec_priv(dev)->secy;
2224 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2225
2226 rx_sc = del_rx_sc(secy, sci);
2227 if (!rx_sc) {
2228 rtnl_unlock();
2229 return -ENODEV;
2230 }
2231
2232 /* If h/w offloading is available, propagate to the device */
2233 if (macsec_is_offloaded(netdev_priv(dev))) {
2234 const struct macsec_ops *ops;
2235 struct macsec_context ctx;
2236
2237 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2238 if (!ops) {
2239 ret = -EOPNOTSUPP;
2240 goto cleanup;
2241 }
2242
2243 ctx.rx_sc = rx_sc;
2244 ctx.secy = secy;
2245 ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2246 if (ret)
2247 goto cleanup;
2248 }
2249
2250 free_rx_sc(rx_sc);
2251 rtnl_unlock();
2252
2253 return 0;
2254
2255cleanup:
2256 rtnl_unlock();
2257 return ret;
2258}
2259
2260static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2261{
2262 struct nlattr **attrs = info->attrs;
2263 struct net_device *dev;
2264 struct macsec_secy *secy;
2265 struct macsec_tx_sc *tx_sc;
2266 struct macsec_tx_sa *tx_sa;
2267 u8 assoc_num;
2268 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2269 int ret;
2270
2271 if (!attrs[MACSEC_ATTR_IFINDEX])
2272 return -EINVAL;
2273
2274 if (parse_sa_config(attrs, tb_sa))
2275 return -EINVAL;
2276
2277 rtnl_lock();
2278 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2279 &dev, &secy, &tx_sc, &assoc_num);
2280 if (IS_ERR(tx_sa)) {
2281 rtnl_unlock();
2282 return PTR_ERR(tx_sa);
2283 }
2284
2285 if (tx_sa->active) {
2286 rtnl_unlock();
2287 return -EBUSY;
2288 }
2289
2290 /* If h/w offloading is available, propagate to the device */
2291 if (macsec_is_offloaded(netdev_priv(dev))) {
2292 const struct macsec_ops *ops;
2293 struct macsec_context ctx;
2294
2295 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2296 if (!ops) {
2297 ret = -EOPNOTSUPP;
2298 goto cleanup;
2299 }
2300
2301 ctx.sa.assoc_num = assoc_num;
2302 ctx.sa.tx_sa = tx_sa;
2303 ctx.secy = secy;
2304
2305 ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2306 if (ret)
2307 goto cleanup;
2308 }
2309
2310 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2311 clear_tx_sa(tx_sa);
2312
2313 rtnl_unlock();
2314
2315 return 0;
2316
2317cleanup:
2318 rtnl_unlock();
2319 return ret;
2320}
2321
2322static bool validate_upd_sa(struct nlattr **attrs)
2323{
2324 if (!attrs[MACSEC_SA_ATTR_AN] ||
2325 attrs[MACSEC_SA_ATTR_KEY] ||
2326 attrs[MACSEC_SA_ATTR_KEYID] ||
2327 attrs[MACSEC_SA_ATTR_SSCI] ||
2328 attrs[MACSEC_SA_ATTR_SALT])
2329 return false;
2330
2331 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2332 return false;
2333
2334 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
2335 return false;
2336
2337 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2338 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2339 return false;
2340 }
2341
2342 return true;
2343}
2344
2345static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2346{
2347 struct nlattr **attrs = info->attrs;
2348 struct net_device *dev;
2349 struct macsec_secy *secy;
2350 struct macsec_tx_sc *tx_sc;
2351 struct macsec_tx_sa *tx_sa;
2352 u8 assoc_num;
2353 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2354 bool was_operational, was_active;
2355 pn_t prev_pn;
2356 int ret = 0;
2357
2358 prev_pn.full64 = 0;
2359
2360 if (!attrs[MACSEC_ATTR_IFINDEX])
2361 return -EINVAL;
2362
2363 if (parse_sa_config(attrs, tb_sa))
2364 return -EINVAL;
2365
2366 if (!validate_upd_sa(tb_sa))
2367 return -EINVAL;
2368
2369 rtnl_lock();
2370 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2371 &dev, &secy, &tx_sc, &assoc_num);
2372 if (IS_ERR(tx_sa)) {
2373 rtnl_unlock();
2374 return PTR_ERR(tx_sa);
2375 }
2376
2377 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2378 int pn_len;
2379
2380 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2381 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2382 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
2383 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2384 rtnl_unlock();
2385 return -EINVAL;
2386 }
2387
2388 spin_lock_bh(&tx_sa->lock);
2389 prev_pn = tx_sa->next_pn_halves;
2390 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2391 spin_unlock_bh(&tx_sa->lock);
2392 }
2393
2394 was_active = tx_sa->active;
2395 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2396 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2397
2398 was_operational = secy->operational;
2399 if (assoc_num == tx_sc->encoding_sa)
2400 secy->operational = tx_sa->active;
2401
2402 /* If h/w offloading is available, propagate to the device */
2403 if (macsec_is_offloaded(netdev_priv(dev))) {
2404 const struct macsec_ops *ops;
2405 struct macsec_context ctx;
2406
2407 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2408 if (!ops) {
2409 ret = -EOPNOTSUPP;
2410 goto cleanup;
2411 }
2412
2413 ctx.sa.assoc_num = assoc_num;
2414 ctx.sa.tx_sa = tx_sa;
2415 ctx.sa.update_pn = !!prev_pn.full64;
2416 ctx.secy = secy;
2417
2418 ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
2419 if (ret)
2420 goto cleanup;
2421 }
2422
2423 rtnl_unlock();
2424
2425 return 0;
2426
2427cleanup:
2428 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2429 spin_lock_bh(&tx_sa->lock);
2430 tx_sa->next_pn_halves = prev_pn;
2431 spin_unlock_bh(&tx_sa->lock);
2432 }
2433 tx_sa->active = was_active;
2434 secy->operational = was_operational;
2435 rtnl_unlock();
2436 return ret;
2437}
2438
2439static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2440{
2441 struct nlattr **attrs = info->attrs;
2442 struct net_device *dev;
2443 struct macsec_secy *secy;
2444 struct macsec_rx_sc *rx_sc;
2445 struct macsec_rx_sa *rx_sa;
2446 u8 assoc_num;
2447 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2448 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2449 bool was_active;
2450 pn_t prev_pn;
2451 int ret = 0;
2452
2453 prev_pn.full64 = 0;
2454
2455 if (!attrs[MACSEC_ATTR_IFINDEX])
2456 return -EINVAL;
2457
2458 if (parse_rxsc_config(attrs, tb_rxsc))
2459 return -EINVAL;
2460
2461 if (parse_sa_config(attrs, tb_sa))
2462 return -EINVAL;
2463
2464 if (!validate_upd_sa(tb_sa))
2465 return -EINVAL;
2466
2467 rtnl_lock();
2468 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2469 &dev, &secy, &rx_sc, &assoc_num);
2470 if (IS_ERR(rx_sa)) {
2471 rtnl_unlock();
2472 return PTR_ERR(rx_sa);
2473 }
2474
2475 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2476 int pn_len;
2477
2478 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2479 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2480 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
2481 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2482 rtnl_unlock();
2483 return -EINVAL;
2484 }
2485
2486 spin_lock_bh(&rx_sa->lock);
2487 prev_pn = rx_sa->next_pn_halves;
2488 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2489 spin_unlock_bh(&rx_sa->lock);
2490 }
2491
2492 was_active = rx_sa->active;
2493 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2494 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2495
2496 /* If h/w offloading is available, propagate to the device */
2497 if (macsec_is_offloaded(netdev_priv(dev))) {
2498 const struct macsec_ops *ops;
2499 struct macsec_context ctx;
2500
2501 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2502 if (!ops) {
2503 ret = -EOPNOTSUPP;
2504 goto cleanup;
2505 }
2506
2507 ctx.sa.assoc_num = assoc_num;
2508 ctx.sa.rx_sa = rx_sa;
2509 ctx.sa.update_pn = !!prev_pn.full64;
2510 ctx.secy = secy;
2511
2512 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2513 if (ret)
2514 goto cleanup;
2515 }
2516
2517 rtnl_unlock();
2518 return 0;
2519
2520cleanup:
2521 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2522 spin_lock_bh(&rx_sa->lock);
2523 rx_sa->next_pn_halves = prev_pn;
2524 spin_unlock_bh(&rx_sa->lock);
2525 }
2526 rx_sa->active = was_active;
2527 rtnl_unlock();
2528 return ret;
2529}
2530
2531static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2532{
2533 struct nlattr **attrs = info->attrs;
2534 struct net_device *dev;
2535 struct macsec_secy *secy;
2536 struct macsec_rx_sc *rx_sc;
2537 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2538 unsigned int prev_n_rx_sc;
2539 bool was_active;
2540 int ret;
2541
2542 if (!attrs[MACSEC_ATTR_IFINDEX])
2543 return -EINVAL;
2544
2545 if (parse_rxsc_config(attrs, tb_rxsc))
2546 return -EINVAL;
2547
2548 if (!validate_add_rxsc(tb_rxsc))
2549 return -EINVAL;
2550
2551 rtnl_lock();
2552 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2553 if (IS_ERR(rx_sc)) {
2554 rtnl_unlock();
2555 return PTR_ERR(rx_sc);
2556 }
2557
2558 was_active = rx_sc->active;
2559 prev_n_rx_sc = secy->n_rx_sc;
2560 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2561 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2562
2563 if (rx_sc->active != new)
2564 secy->n_rx_sc += new ? 1 : -1;
2565
2566 rx_sc->active = new;
2567 }
2568
2569 /* If h/w offloading is available, propagate to the device */
2570 if (macsec_is_offloaded(netdev_priv(dev))) {
2571 const struct macsec_ops *ops;
2572 struct macsec_context ctx;
2573
2574 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2575 if (!ops) {
2576 ret = -EOPNOTSUPP;
2577 goto cleanup;
2578 }
2579
2580 ctx.rx_sc = rx_sc;
2581 ctx.secy = secy;
2582
2583 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2584 if (ret)
2585 goto cleanup;
2586 }
2587
2588 rtnl_unlock();
2589
2590 return 0;
2591
2592cleanup:
2593 secy->n_rx_sc = prev_n_rx_sc;
2594 rx_sc->active = was_active;
2595 rtnl_unlock();
2596 return ret;
2597}
2598
2599static bool macsec_is_configured(struct macsec_dev *macsec)
2600{
2601 struct macsec_secy *secy = &macsec->secy;
2602 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2603 int i;
2604
2605 if (secy->rx_sc)
2606 return true;
2607
2608 for (i = 0; i < MACSEC_NUM_AN; i++)
2609 if (tx_sc->sa[i])
2610 return true;
2611
2612 return false;
2613}
2614
2615static bool macsec_needs_tx_tag(struct macsec_dev *macsec,
2616 const struct macsec_ops *ops)
2617{
2618 return macsec->offload == MACSEC_OFFLOAD_PHY &&
2619 ops->mdo_insert_tx_tag;
2620}
2621
2622static void macsec_set_head_tail_room(struct net_device *dev)
2623{
2624 struct macsec_dev *macsec = macsec_priv(dev);
2625 struct net_device *real_dev = macsec->real_dev;
2626 int needed_headroom, needed_tailroom;
2627 const struct macsec_ops *ops;
2628
2629 ops = macsec_get_ops(macsec, NULL);
2630 if (ops) {
2631 needed_headroom = ops->needed_headroom;
2632 needed_tailroom = ops->needed_tailroom;
2633 } else {
2634 needed_headroom = MACSEC_NEEDED_HEADROOM;
2635 needed_tailroom = MACSEC_NEEDED_TAILROOM;
2636 }
2637
2638 dev->needed_headroom = real_dev->needed_headroom + needed_headroom;
2639 dev->needed_tailroom = real_dev->needed_tailroom + needed_tailroom;
2640}
2641
2642static int macsec_update_offload(struct net_device *dev, enum macsec_offload offload)
2643{
2644 enum macsec_offload prev_offload;
2645 const struct macsec_ops *ops;
2646 struct macsec_context ctx;
2647 struct macsec_dev *macsec;
2648 int ret = 0;
2649
2650 macsec = macsec_priv(dev);
2651
2652 /* Check if the offloading mode is supported by the underlying layers */
2653 if (offload != MACSEC_OFFLOAD_OFF &&
2654 !macsec_check_offload(offload, macsec))
2655 return -EOPNOTSUPP;
2656
2657 /* Check if the net device is busy. */
2658 if (netif_running(dev))
2659 return -EBUSY;
2660
2661 /* Check if the device already has rules configured: we do not support
2662 * rules migration.
2663 */
2664 if (macsec_is_configured(macsec))
2665 return -EBUSY;
2666
2667 prev_offload = macsec->offload;
2668
2669 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2670 macsec, &ctx);
2671 if (!ops)
2672 return -EOPNOTSUPP;
2673
2674 macsec->offload = offload;
2675
2676 ctx.secy = &macsec->secy;
2677 ret = offload == MACSEC_OFFLOAD_OFF ? macsec_offload(ops->mdo_del_secy, &ctx)
2678 : macsec_offload(ops->mdo_add_secy, &ctx);
2679 if (ret) {
2680 macsec->offload = prev_offload;
2681 return ret;
2682 }
2683
2684 macsec_set_head_tail_room(dev);
2685 macsec->insert_tx_tag = macsec_needs_tx_tag(macsec, ops);
2686
2687 return ret;
2688}
2689
2690static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2691{
2692 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2693 struct nlattr **attrs = info->attrs;
2694 enum macsec_offload offload;
2695 struct macsec_dev *macsec;
2696 struct net_device *dev;
2697 int ret = 0;
2698
2699 if (!attrs[MACSEC_ATTR_IFINDEX])
2700 return -EINVAL;
2701
2702 if (!attrs[MACSEC_ATTR_OFFLOAD])
2703 return -EINVAL;
2704
2705 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2706 attrs[MACSEC_ATTR_OFFLOAD],
2707 macsec_genl_offload_policy, NULL))
2708 return -EINVAL;
2709
2710 rtnl_lock();
2711
2712 dev = get_dev_from_nl(genl_info_net(info), attrs);
2713 if (IS_ERR(dev)) {
2714 ret = PTR_ERR(dev);
2715 goto out;
2716 }
2717 macsec = macsec_priv(dev);
2718
2719 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) {
2720 ret = -EINVAL;
2721 goto out;
2722 }
2723
2724 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2725
2726 if (macsec->offload != offload)
2727 ret = macsec_update_offload(dev, offload);
2728out:
2729 rtnl_unlock();
2730 return ret;
2731}
2732
2733static void get_tx_sa_stats(struct net_device *dev, int an,
2734 struct macsec_tx_sa *tx_sa,
2735 struct macsec_tx_sa_stats *sum)
2736{
2737 struct macsec_dev *macsec = macsec_priv(dev);
2738 int cpu;
2739
2740 /* If h/w offloading is available, propagate to the device */
2741 if (macsec_is_offloaded(macsec)) {
2742 const struct macsec_ops *ops;
2743 struct macsec_context ctx;
2744
2745 ops = macsec_get_ops(macsec, &ctx);
2746 if (ops) {
2747 ctx.sa.assoc_num = an;
2748 ctx.sa.tx_sa = tx_sa;
2749 ctx.stats.tx_sa_stats = sum;
2750 ctx.secy = &macsec_priv(dev)->secy;
2751 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
2752 }
2753 return;
2754 }
2755
2756 for_each_possible_cpu(cpu) {
2757 const struct macsec_tx_sa_stats *stats =
2758 per_cpu_ptr(tx_sa->stats, cpu);
2759
2760 sum->OutPktsProtected += stats->OutPktsProtected;
2761 sum->OutPktsEncrypted += stats->OutPktsEncrypted;
2762 }
2763}
2764
2765static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
2766{
2767 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
2768 sum->OutPktsProtected) ||
2769 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2770 sum->OutPktsEncrypted))
2771 return -EMSGSIZE;
2772
2773 return 0;
2774}
2775
2776static void get_rx_sa_stats(struct net_device *dev,
2777 struct macsec_rx_sc *rx_sc, int an,
2778 struct macsec_rx_sa *rx_sa,
2779 struct macsec_rx_sa_stats *sum)
2780{
2781 struct macsec_dev *macsec = macsec_priv(dev);
2782 int cpu;
2783
2784 /* If h/w offloading is available, propagate to the device */
2785 if (macsec_is_offloaded(macsec)) {
2786 const struct macsec_ops *ops;
2787 struct macsec_context ctx;
2788
2789 ops = macsec_get_ops(macsec, &ctx);
2790 if (ops) {
2791 ctx.sa.assoc_num = an;
2792 ctx.sa.rx_sa = rx_sa;
2793 ctx.stats.rx_sa_stats = sum;
2794 ctx.secy = &macsec_priv(dev)->secy;
2795 ctx.rx_sc = rx_sc;
2796 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
2797 }
2798 return;
2799 }
2800
2801 for_each_possible_cpu(cpu) {
2802 const struct macsec_rx_sa_stats *stats =
2803 per_cpu_ptr(rx_sa->stats, cpu);
2804
2805 sum->InPktsOK += stats->InPktsOK;
2806 sum->InPktsInvalid += stats->InPktsInvalid;
2807 sum->InPktsNotValid += stats->InPktsNotValid;
2808 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
2809 sum->InPktsUnusedSA += stats->InPktsUnusedSA;
2810 }
2811}
2812
2813static int copy_rx_sa_stats(struct sk_buff *skb,
2814 struct macsec_rx_sa_stats *sum)
2815{
2816 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
2817 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
2818 sum->InPktsInvalid) ||
2819 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
2820 sum->InPktsNotValid) ||
2821 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2822 sum->InPktsNotUsingSA) ||
2823 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
2824 sum->InPktsUnusedSA))
2825 return -EMSGSIZE;
2826
2827 return 0;
2828}
2829
2830static void get_rx_sc_stats(struct net_device *dev,
2831 struct macsec_rx_sc *rx_sc,
2832 struct macsec_rx_sc_stats *sum)
2833{
2834 struct macsec_dev *macsec = macsec_priv(dev);
2835 int cpu;
2836
2837 /* If h/w offloading is available, propagate to the device */
2838 if (macsec_is_offloaded(macsec)) {
2839 const struct macsec_ops *ops;
2840 struct macsec_context ctx;
2841
2842 ops = macsec_get_ops(macsec, &ctx);
2843 if (ops) {
2844 ctx.stats.rx_sc_stats = sum;
2845 ctx.secy = &macsec_priv(dev)->secy;
2846 ctx.rx_sc = rx_sc;
2847 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
2848 }
2849 return;
2850 }
2851
2852 for_each_possible_cpu(cpu) {
2853 const struct pcpu_rx_sc_stats *stats;
2854 struct macsec_rx_sc_stats tmp;
2855 unsigned int start;
2856
2857 stats = per_cpu_ptr(rx_sc->stats, cpu);
2858 do {
2859 start = u64_stats_fetch_begin(&stats->syncp);
2860 memcpy(&tmp, &stats->stats, sizeof(tmp));
2861 } while (u64_stats_fetch_retry(&stats->syncp, start));
2862
2863 sum->InOctetsValidated += tmp.InOctetsValidated;
2864 sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
2865 sum->InPktsUnchecked += tmp.InPktsUnchecked;
2866 sum->InPktsDelayed += tmp.InPktsDelayed;
2867 sum->InPktsOK += tmp.InPktsOK;
2868 sum->InPktsInvalid += tmp.InPktsInvalid;
2869 sum->InPktsLate += tmp.InPktsLate;
2870 sum->InPktsNotValid += tmp.InPktsNotValid;
2871 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2872 sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
2873 }
2874}
2875
2876static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
2877{
2878 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2879 sum->InOctetsValidated,
2880 MACSEC_RXSC_STATS_ATTR_PAD) ||
2881 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2882 sum->InOctetsDecrypted,
2883 MACSEC_RXSC_STATS_ATTR_PAD) ||
2884 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2885 sum->InPktsUnchecked,
2886 MACSEC_RXSC_STATS_ATTR_PAD) ||
2887 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2888 sum->InPktsDelayed,
2889 MACSEC_RXSC_STATS_ATTR_PAD) ||
2890 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2891 sum->InPktsOK,
2892 MACSEC_RXSC_STATS_ATTR_PAD) ||
2893 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2894 sum->InPktsInvalid,
2895 MACSEC_RXSC_STATS_ATTR_PAD) ||
2896 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2897 sum->InPktsLate,
2898 MACSEC_RXSC_STATS_ATTR_PAD) ||
2899 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2900 sum->InPktsNotValid,
2901 MACSEC_RXSC_STATS_ATTR_PAD) ||
2902 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2903 sum->InPktsNotUsingSA,
2904 MACSEC_RXSC_STATS_ATTR_PAD) ||
2905 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2906 sum->InPktsUnusedSA,
2907 MACSEC_RXSC_STATS_ATTR_PAD))
2908 return -EMSGSIZE;
2909
2910 return 0;
2911}
2912
2913static void get_tx_sc_stats(struct net_device *dev,
2914 struct macsec_tx_sc_stats *sum)
2915{
2916 struct macsec_dev *macsec = macsec_priv(dev);
2917 int cpu;
2918
2919 /* If h/w offloading is available, propagate to the device */
2920 if (macsec_is_offloaded(macsec)) {
2921 const struct macsec_ops *ops;
2922 struct macsec_context ctx;
2923
2924 ops = macsec_get_ops(macsec, &ctx);
2925 if (ops) {
2926 ctx.stats.tx_sc_stats = sum;
2927 ctx.secy = &macsec_priv(dev)->secy;
2928 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
2929 }
2930 return;
2931 }
2932
2933 for_each_possible_cpu(cpu) {
2934 const struct pcpu_tx_sc_stats *stats;
2935 struct macsec_tx_sc_stats tmp;
2936 unsigned int start;
2937
2938 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
2939 do {
2940 start = u64_stats_fetch_begin(&stats->syncp);
2941 memcpy(&tmp, &stats->stats, sizeof(tmp));
2942 } while (u64_stats_fetch_retry(&stats->syncp, start));
2943
2944 sum->OutPktsProtected += tmp.OutPktsProtected;
2945 sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
2946 sum->OutOctetsProtected += tmp.OutOctetsProtected;
2947 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2948 }
2949}
2950
2951static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
2952{
2953 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2954 sum->OutPktsProtected,
2955 MACSEC_TXSC_STATS_ATTR_PAD) ||
2956 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2957 sum->OutPktsEncrypted,
2958 MACSEC_TXSC_STATS_ATTR_PAD) ||
2959 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2960 sum->OutOctetsProtected,
2961 MACSEC_TXSC_STATS_ATTR_PAD) ||
2962 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2963 sum->OutOctetsEncrypted,
2964 MACSEC_TXSC_STATS_ATTR_PAD))
2965 return -EMSGSIZE;
2966
2967 return 0;
2968}
2969
2970static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
2971{
2972 struct macsec_dev *macsec = macsec_priv(dev);
2973 int cpu;
2974
2975 /* If h/w offloading is available, propagate to the device */
2976 if (macsec_is_offloaded(macsec)) {
2977 const struct macsec_ops *ops;
2978 struct macsec_context ctx;
2979
2980 ops = macsec_get_ops(macsec, &ctx);
2981 if (ops) {
2982 ctx.stats.dev_stats = sum;
2983 ctx.secy = &macsec_priv(dev)->secy;
2984 macsec_offload(ops->mdo_get_dev_stats, &ctx);
2985 }
2986 return;
2987 }
2988
2989 for_each_possible_cpu(cpu) {
2990 const struct pcpu_secy_stats *stats;
2991 struct macsec_dev_stats tmp;
2992 unsigned int start;
2993
2994 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
2995 do {
2996 start = u64_stats_fetch_begin(&stats->syncp);
2997 memcpy(&tmp, &stats->stats, sizeof(tmp));
2998 } while (u64_stats_fetch_retry(&stats->syncp, start));
2999
3000 sum->OutPktsUntagged += tmp.OutPktsUntagged;
3001 sum->InPktsUntagged += tmp.InPktsUntagged;
3002 sum->OutPktsTooLong += tmp.OutPktsTooLong;
3003 sum->InPktsNoTag += tmp.InPktsNoTag;
3004 sum->InPktsBadTag += tmp.InPktsBadTag;
3005 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
3006 sum->InPktsNoSCI += tmp.InPktsNoSCI;
3007 sum->InPktsOverrun += tmp.InPktsOverrun;
3008 }
3009}
3010
3011static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
3012{
3013 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
3014 sum->OutPktsUntagged,
3015 MACSEC_SECY_STATS_ATTR_PAD) ||
3016 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
3017 sum->InPktsUntagged,
3018 MACSEC_SECY_STATS_ATTR_PAD) ||
3019 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
3020 sum->OutPktsTooLong,
3021 MACSEC_SECY_STATS_ATTR_PAD) ||
3022 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
3023 sum->InPktsNoTag,
3024 MACSEC_SECY_STATS_ATTR_PAD) ||
3025 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
3026 sum->InPktsBadTag,
3027 MACSEC_SECY_STATS_ATTR_PAD) ||
3028 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
3029 sum->InPktsUnknownSCI,
3030 MACSEC_SECY_STATS_ATTR_PAD) ||
3031 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
3032 sum->InPktsNoSCI,
3033 MACSEC_SECY_STATS_ATTR_PAD) ||
3034 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
3035 sum->InPktsOverrun,
3036 MACSEC_SECY_STATS_ATTR_PAD))
3037 return -EMSGSIZE;
3038
3039 return 0;
3040}
3041
3042static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
3043{
3044 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3045 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
3046 MACSEC_ATTR_SECY);
3047 u64 csid;
3048
3049 if (!secy_nest)
3050 return 1;
3051
3052 switch (secy->key_len) {
3053 case MACSEC_GCM_AES_128_SAK_LEN:
3054 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
3055 break;
3056 case MACSEC_GCM_AES_256_SAK_LEN:
3057 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
3058 break;
3059 default:
3060 goto cancel;
3061 }
3062
3063 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
3064 MACSEC_SECY_ATTR_PAD) ||
3065 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
3066 csid, MACSEC_SECY_ATTR_PAD) ||
3067 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
3068 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
3069 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
3070 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
3071 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
3072 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
3073 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
3074 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
3075 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
3076 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
3077 goto cancel;
3078
3079 if (secy->replay_protect) {
3080 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
3081 goto cancel;
3082 }
3083
3084 nla_nest_end(skb, secy_nest);
3085 return 0;
3086
3087cancel:
3088 nla_nest_cancel(skb, secy_nest);
3089 return 1;
3090}
3091
3092static noinline_for_stack int
3093dump_secy(struct macsec_secy *secy, struct net_device *dev,
3094 struct sk_buff *skb, struct netlink_callback *cb)
3095{
3096 struct macsec_tx_sc_stats tx_sc_stats = {0, };
3097 struct macsec_tx_sa_stats tx_sa_stats = {0, };
3098 struct macsec_rx_sc_stats rx_sc_stats = {0, };
3099 struct macsec_rx_sa_stats rx_sa_stats = {0, };
3100 struct macsec_dev *macsec = netdev_priv(dev);
3101 struct macsec_dev_stats dev_stats = {0, };
3102 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3103 struct nlattr *txsa_list, *rxsc_list;
3104 struct macsec_rx_sc *rx_sc;
3105 struct nlattr *attr;
3106 void *hdr;
3107 int i, j;
3108
3109 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3110 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
3111 if (!hdr)
3112 return -EMSGSIZE;
3113
3114 genl_dump_check_consistent(cb, hdr);
3115
3116 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
3117 goto nla_put_failure;
3118
3119 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
3120 if (!attr)
3121 goto nla_put_failure;
3122 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
3123 goto nla_put_failure;
3124 nla_nest_end(skb, attr);
3125
3126 if (nla_put_secy(secy, skb))
3127 goto nla_put_failure;
3128
3129 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
3130 if (!attr)
3131 goto nla_put_failure;
3132
3133 get_tx_sc_stats(dev, &tx_sc_stats);
3134 if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
3135 nla_nest_cancel(skb, attr);
3136 goto nla_put_failure;
3137 }
3138 nla_nest_end(skb, attr);
3139
3140 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
3141 if (!attr)
3142 goto nla_put_failure;
3143 get_secy_stats(dev, &dev_stats);
3144 if (copy_secy_stats(skb, &dev_stats)) {
3145 nla_nest_cancel(skb, attr);
3146 goto nla_put_failure;
3147 }
3148 nla_nest_end(skb, attr);
3149
3150 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
3151 if (!txsa_list)
3152 goto nla_put_failure;
3153 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
3154 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
3155 struct nlattr *txsa_nest;
3156 u64 pn;
3157 int pn_len;
3158
3159 if (!tx_sa)
3160 continue;
3161
3162 txsa_nest = nla_nest_start_noflag(skb, j++);
3163 if (!txsa_nest) {
3164 nla_nest_cancel(skb, txsa_list);
3165 goto nla_put_failure;
3166 }
3167
3168 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
3169 if (!attr) {
3170 nla_nest_cancel(skb, txsa_nest);
3171 nla_nest_cancel(skb, txsa_list);
3172 goto nla_put_failure;
3173 }
3174 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
3175 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
3176 if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
3177 nla_nest_cancel(skb, attr);
3178 nla_nest_cancel(skb, txsa_nest);
3179 nla_nest_cancel(skb, txsa_list);
3180 goto nla_put_failure;
3181 }
3182 nla_nest_end(skb, attr);
3183
3184 if (secy->xpn) {
3185 pn = tx_sa->next_pn;
3186 pn_len = MACSEC_XPN_PN_LEN;
3187 } else {
3188 pn = tx_sa->next_pn_halves.lower;
3189 pn_len = MACSEC_DEFAULT_PN_LEN;
3190 }
3191
3192 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3193 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3194 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
3195 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
3196 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
3197 nla_nest_cancel(skb, txsa_nest);
3198 nla_nest_cancel(skb, txsa_list);
3199 goto nla_put_failure;
3200 }
3201
3202 nla_nest_end(skb, txsa_nest);
3203 }
3204 nla_nest_end(skb, txsa_list);
3205
3206 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
3207 if (!rxsc_list)
3208 goto nla_put_failure;
3209
3210 j = 1;
3211 for_each_rxsc_rtnl(secy, rx_sc) {
3212 int k;
3213 struct nlattr *rxsa_list;
3214 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
3215
3216 if (!rxsc_nest) {
3217 nla_nest_cancel(skb, rxsc_list);
3218 goto nla_put_failure;
3219 }
3220
3221 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
3222 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
3223 MACSEC_RXSC_ATTR_PAD)) {
3224 nla_nest_cancel(skb, rxsc_nest);
3225 nla_nest_cancel(skb, rxsc_list);
3226 goto nla_put_failure;
3227 }
3228
3229 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
3230 if (!attr) {
3231 nla_nest_cancel(skb, rxsc_nest);
3232 nla_nest_cancel(skb, rxsc_list);
3233 goto nla_put_failure;
3234 }
3235 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
3236 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
3237 if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
3238 nla_nest_cancel(skb, attr);
3239 nla_nest_cancel(skb, rxsc_nest);
3240 nla_nest_cancel(skb, rxsc_list);
3241 goto nla_put_failure;
3242 }
3243 nla_nest_end(skb, attr);
3244
3245 rxsa_list = nla_nest_start_noflag(skb,
3246 MACSEC_RXSC_ATTR_SA_LIST);
3247 if (!rxsa_list) {
3248 nla_nest_cancel(skb, rxsc_nest);
3249 nla_nest_cancel(skb, rxsc_list);
3250 goto nla_put_failure;
3251 }
3252
3253 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
3254 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
3255 struct nlattr *rxsa_nest;
3256 u64 pn;
3257 int pn_len;
3258
3259 if (!rx_sa)
3260 continue;
3261
3262 rxsa_nest = nla_nest_start_noflag(skb, k++);
3263 if (!rxsa_nest) {
3264 nla_nest_cancel(skb, rxsa_list);
3265 nla_nest_cancel(skb, rxsc_nest);
3266 nla_nest_cancel(skb, rxsc_list);
3267 goto nla_put_failure;
3268 }
3269
3270 attr = nla_nest_start_noflag(skb,
3271 MACSEC_SA_ATTR_STATS);
3272 if (!attr) {
3273 nla_nest_cancel(skb, rxsa_list);
3274 nla_nest_cancel(skb, rxsc_nest);
3275 nla_nest_cancel(skb, rxsc_list);
3276 goto nla_put_failure;
3277 }
3278 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
3279 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
3280 if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
3281 nla_nest_cancel(skb, attr);
3282 nla_nest_cancel(skb, rxsa_list);
3283 nla_nest_cancel(skb, rxsc_nest);
3284 nla_nest_cancel(skb, rxsc_list);
3285 goto nla_put_failure;
3286 }
3287 nla_nest_end(skb, attr);
3288
3289 if (secy->xpn) {
3290 pn = rx_sa->next_pn;
3291 pn_len = MACSEC_XPN_PN_LEN;
3292 } else {
3293 pn = rx_sa->next_pn_halves.lower;
3294 pn_len = MACSEC_DEFAULT_PN_LEN;
3295 }
3296
3297 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3298 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3299 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
3300 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
3301 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
3302 nla_nest_cancel(skb, rxsa_nest);
3303 nla_nest_cancel(skb, rxsc_nest);
3304 nla_nest_cancel(skb, rxsc_list);
3305 goto nla_put_failure;
3306 }
3307 nla_nest_end(skb, rxsa_nest);
3308 }
3309
3310 nla_nest_end(skb, rxsa_list);
3311 nla_nest_end(skb, rxsc_nest);
3312 }
3313
3314 nla_nest_end(skb, rxsc_list);
3315
3316 genlmsg_end(skb, hdr);
3317
3318 return 0;
3319
3320nla_put_failure:
3321 genlmsg_cancel(skb, hdr);
3322 return -EMSGSIZE;
3323}
3324
3325static int macsec_generation = 1; /* protected by RTNL */
3326
3327static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
3328{
3329 struct net *net = sock_net(skb->sk);
3330 struct net_device *dev;
3331 int dev_idx, d;
3332
3333 dev_idx = cb->args[0];
3334
3335 d = 0;
3336 rtnl_lock();
3337
3338 cb->seq = macsec_generation;
3339
3340 for_each_netdev(net, dev) {
3341 struct macsec_secy *secy;
3342
3343 if (d < dev_idx)
3344 goto next;
3345
3346 if (!netif_is_macsec(dev))
3347 goto next;
3348
3349 secy = &macsec_priv(dev)->secy;
3350 if (dump_secy(secy, dev, skb, cb) < 0)
3351 goto done;
3352next:
3353 d++;
3354 }
3355
3356done:
3357 rtnl_unlock();
3358 cb->args[0] = d;
3359 return skb->len;
3360}
3361
3362static const struct genl_small_ops macsec_genl_ops[] = {
3363 {
3364 .cmd = MACSEC_CMD_GET_TXSC,
3365 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3366 .dumpit = macsec_dump_txsc,
3367 },
3368 {
3369 .cmd = MACSEC_CMD_ADD_RXSC,
3370 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3371 .doit = macsec_add_rxsc,
3372 .flags = GENL_ADMIN_PERM,
3373 },
3374 {
3375 .cmd = MACSEC_CMD_DEL_RXSC,
3376 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3377 .doit = macsec_del_rxsc,
3378 .flags = GENL_ADMIN_PERM,
3379 },
3380 {
3381 .cmd = MACSEC_CMD_UPD_RXSC,
3382 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3383 .doit = macsec_upd_rxsc,
3384 .flags = GENL_ADMIN_PERM,
3385 },
3386 {
3387 .cmd = MACSEC_CMD_ADD_TXSA,
3388 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3389 .doit = macsec_add_txsa,
3390 .flags = GENL_ADMIN_PERM,
3391 },
3392 {
3393 .cmd = MACSEC_CMD_DEL_TXSA,
3394 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3395 .doit = macsec_del_txsa,
3396 .flags = GENL_ADMIN_PERM,
3397 },
3398 {
3399 .cmd = MACSEC_CMD_UPD_TXSA,
3400 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3401 .doit = macsec_upd_txsa,
3402 .flags = GENL_ADMIN_PERM,
3403 },
3404 {
3405 .cmd = MACSEC_CMD_ADD_RXSA,
3406 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3407 .doit = macsec_add_rxsa,
3408 .flags = GENL_ADMIN_PERM,
3409 },
3410 {
3411 .cmd = MACSEC_CMD_DEL_RXSA,
3412 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3413 .doit = macsec_del_rxsa,
3414 .flags = GENL_ADMIN_PERM,
3415 },
3416 {
3417 .cmd = MACSEC_CMD_UPD_RXSA,
3418 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3419 .doit = macsec_upd_rxsa,
3420 .flags = GENL_ADMIN_PERM,
3421 },
3422 {
3423 .cmd = MACSEC_CMD_UPD_OFFLOAD,
3424 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3425 .doit = macsec_upd_offload,
3426 .flags = GENL_ADMIN_PERM,
3427 },
3428};
3429
3430static struct genl_family macsec_fam __ro_after_init = {
3431 .name = MACSEC_GENL_NAME,
3432 .hdrsize = 0,
3433 .version = MACSEC_GENL_VERSION,
3434 .maxattr = MACSEC_ATTR_MAX,
3435 .policy = macsec_genl_policy,
3436 .netnsok = true,
3437 .module = THIS_MODULE,
3438 .small_ops = macsec_genl_ops,
3439 .n_small_ops = ARRAY_SIZE(macsec_genl_ops),
3440 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1,
3441};
3442
3443static struct sk_buff *macsec_insert_tx_tag(struct sk_buff *skb,
3444 struct net_device *dev)
3445{
3446 struct macsec_dev *macsec = macsec_priv(dev);
3447 const struct macsec_ops *ops;
3448 struct phy_device *phydev;
3449 struct macsec_context ctx;
3450 int skb_final_len;
3451 int err;
3452
3453 ops = macsec_get_ops(macsec, &ctx);
3454 skb_final_len = skb->len - ETH_HLEN + ops->needed_headroom +
3455 ops->needed_tailroom;
3456 if (unlikely(skb_final_len > macsec->real_dev->mtu)) {
3457 err = -EINVAL;
3458 goto cleanup;
3459 }
3460
3461 phydev = macsec->real_dev->phydev;
3462
3463 err = skb_ensure_writable_head_tail(skb, dev);
3464 if (unlikely(err < 0))
3465 goto cleanup;
3466
3467 err = ops->mdo_insert_tx_tag(phydev, skb);
3468 if (unlikely(err))
3469 goto cleanup;
3470
3471 return skb;
3472cleanup:
3473 kfree_skb(skb);
3474 return ERR_PTR(err);
3475}
3476
3477static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3478 struct net_device *dev)
3479{
3480 struct macsec_dev *macsec = netdev_priv(dev);
3481 struct macsec_secy *secy = &macsec->secy;
3482 struct pcpu_secy_stats *secy_stats;
3483 int ret, len;
3484
3485 if (macsec_is_offloaded(netdev_priv(dev))) {
3486 struct metadata_dst *md_dst = secy->tx_sc.md_dst;
3487
3488 skb_dst_drop(skb);
3489 dst_hold(&md_dst->dst);
3490 skb_dst_set(skb, &md_dst->dst);
3491
3492 if (macsec->insert_tx_tag) {
3493 skb = macsec_insert_tx_tag(skb, dev);
3494 if (IS_ERR(skb)) {
3495 DEV_STATS_INC(dev, tx_dropped);
3496 return NETDEV_TX_OK;
3497 }
3498 }
3499
3500 skb->dev = macsec->real_dev;
3501 return dev_queue_xmit(skb);
3502 }
3503
3504 /* 10.5 */
3505 if (!secy->protect_frames) {
3506 secy_stats = this_cpu_ptr(macsec->stats);
3507 u64_stats_update_begin(&secy_stats->syncp);
3508 secy_stats->stats.OutPktsUntagged++;
3509 u64_stats_update_end(&secy_stats->syncp);
3510 skb->dev = macsec->real_dev;
3511 len = skb->len;
3512 ret = dev_queue_xmit(skb);
3513 count_tx(dev, ret, len);
3514 return ret;
3515 }
3516
3517 if (!secy->operational) {
3518 kfree_skb(skb);
3519 DEV_STATS_INC(dev, tx_dropped);
3520 return NETDEV_TX_OK;
3521 }
3522
3523 len = skb->len;
3524 skb = macsec_encrypt(skb, dev);
3525 if (IS_ERR(skb)) {
3526 if (PTR_ERR(skb) != -EINPROGRESS)
3527 DEV_STATS_INC(dev, tx_dropped);
3528 return NETDEV_TX_OK;
3529 }
3530
3531 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3532
3533 macsec_encrypt_finish(skb, dev);
3534 ret = dev_queue_xmit(skb);
3535 count_tx(dev, ret, len);
3536 return ret;
3537}
3538
3539#define MACSEC_FEATURES \
3540 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3541
3542static int macsec_dev_init(struct net_device *dev)
3543{
3544 struct macsec_dev *macsec = macsec_priv(dev);
3545 struct net_device *real_dev = macsec->real_dev;
3546 int err;
3547
3548 err = gro_cells_init(&macsec->gro_cells, dev);
3549 if (err)
3550 return err;
3551
3552 dev->features = real_dev->features & MACSEC_FEATURES;
3553 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
3554 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
3555
3556 macsec_set_head_tail_room(dev);
3557
3558 if (is_zero_ether_addr(dev->dev_addr))
3559 eth_hw_addr_inherit(dev, real_dev);
3560 if (is_zero_ether_addr(dev->broadcast))
3561 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3562
3563 /* Get macsec's reference to real_dev */
3564 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL);
3565
3566 return 0;
3567}
3568
3569static void macsec_dev_uninit(struct net_device *dev)
3570{
3571 struct macsec_dev *macsec = macsec_priv(dev);
3572
3573 gro_cells_destroy(&macsec->gro_cells);
3574}
3575
3576static netdev_features_t macsec_fix_features(struct net_device *dev,
3577 netdev_features_t features)
3578{
3579 struct macsec_dev *macsec = macsec_priv(dev);
3580 struct net_device *real_dev = macsec->real_dev;
3581
3582 features &= (real_dev->features & MACSEC_FEATURES) |
3583 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3584 features |= NETIF_F_LLTX;
3585
3586 return features;
3587}
3588
3589static int macsec_dev_open(struct net_device *dev)
3590{
3591 struct macsec_dev *macsec = macsec_priv(dev);
3592 struct net_device *real_dev = macsec->real_dev;
3593 int err;
3594
3595 err = dev_uc_add(real_dev, dev->dev_addr);
3596 if (err < 0)
3597 return err;
3598
3599 if (dev->flags & IFF_ALLMULTI) {
3600 err = dev_set_allmulti(real_dev, 1);
3601 if (err < 0)
3602 goto del_unicast;
3603 }
3604
3605 if (dev->flags & IFF_PROMISC) {
3606 err = dev_set_promiscuity(real_dev, 1);
3607 if (err < 0)
3608 goto clear_allmulti;
3609 }
3610
3611 /* If h/w offloading is available, propagate to the device */
3612 if (macsec_is_offloaded(macsec)) {
3613 const struct macsec_ops *ops;
3614 struct macsec_context ctx;
3615
3616 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3617 if (!ops) {
3618 err = -EOPNOTSUPP;
3619 goto clear_allmulti;
3620 }
3621
3622 ctx.secy = &macsec->secy;
3623 err = macsec_offload(ops->mdo_dev_open, &ctx);
3624 if (err)
3625 goto clear_allmulti;
3626 }
3627
3628 if (netif_carrier_ok(real_dev))
3629 netif_carrier_on(dev);
3630
3631 return 0;
3632clear_allmulti:
3633 if (dev->flags & IFF_ALLMULTI)
3634 dev_set_allmulti(real_dev, -1);
3635del_unicast:
3636 dev_uc_del(real_dev, dev->dev_addr);
3637 netif_carrier_off(dev);
3638 return err;
3639}
3640
3641static int macsec_dev_stop(struct net_device *dev)
3642{
3643 struct macsec_dev *macsec = macsec_priv(dev);
3644 struct net_device *real_dev = macsec->real_dev;
3645
3646 netif_carrier_off(dev);
3647
3648 /* If h/w offloading is available, propagate to the device */
3649 if (macsec_is_offloaded(macsec)) {
3650 const struct macsec_ops *ops;
3651 struct macsec_context ctx;
3652
3653 ops = macsec_get_ops(macsec, &ctx);
3654 if (ops) {
3655 ctx.secy = &macsec->secy;
3656 macsec_offload(ops->mdo_dev_stop, &ctx);
3657 }
3658 }
3659
3660 dev_mc_unsync(real_dev, dev);
3661 dev_uc_unsync(real_dev, dev);
3662
3663 if (dev->flags & IFF_ALLMULTI)
3664 dev_set_allmulti(real_dev, -1);
3665
3666 if (dev->flags & IFF_PROMISC)
3667 dev_set_promiscuity(real_dev, -1);
3668
3669 dev_uc_del(real_dev, dev->dev_addr);
3670
3671 return 0;
3672}
3673
3674static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3675{
3676 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3677
3678 if (!(dev->flags & IFF_UP))
3679 return;
3680
3681 if (change & IFF_ALLMULTI)
3682 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3683
3684 if (change & IFF_PROMISC)
3685 dev_set_promiscuity(real_dev,
3686 dev->flags & IFF_PROMISC ? 1 : -1);
3687}
3688
3689static void macsec_dev_set_rx_mode(struct net_device *dev)
3690{
3691 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3692
3693 dev_mc_sync(real_dev, dev);
3694 dev_uc_sync(real_dev, dev);
3695}
3696
3697static int macsec_set_mac_address(struct net_device *dev, void *p)
3698{
3699 struct macsec_dev *macsec = macsec_priv(dev);
3700 struct net_device *real_dev = macsec->real_dev;
3701 struct sockaddr *addr = p;
3702 u8 old_addr[ETH_ALEN];
3703 int err;
3704
3705 if (!is_valid_ether_addr(addr->sa_data))
3706 return -EADDRNOTAVAIL;
3707
3708 if (dev->flags & IFF_UP) {
3709 err = dev_uc_add(real_dev, addr->sa_data);
3710 if (err < 0)
3711 return err;
3712 }
3713
3714 ether_addr_copy(old_addr, dev->dev_addr);
3715 eth_hw_addr_set(dev, addr->sa_data);
3716
3717 /* If h/w offloading is available, propagate to the device */
3718 if (macsec_is_offloaded(macsec)) {
3719 const struct macsec_ops *ops;
3720 struct macsec_context ctx;
3721
3722 ops = macsec_get_ops(macsec, &ctx);
3723 if (!ops) {
3724 err = -EOPNOTSUPP;
3725 goto restore_old_addr;
3726 }
3727
3728 ctx.secy = &macsec->secy;
3729 err = macsec_offload(ops->mdo_upd_secy, &ctx);
3730 if (err)
3731 goto restore_old_addr;
3732 }
3733
3734 if (dev->flags & IFF_UP)
3735 dev_uc_del(real_dev, old_addr);
3736
3737 return 0;
3738
3739restore_old_addr:
3740 if (dev->flags & IFF_UP)
3741 dev_uc_del(real_dev, addr->sa_data);
3742
3743 eth_hw_addr_set(dev, old_addr);
3744
3745 return err;
3746}
3747
3748static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3749{
3750 struct macsec_dev *macsec = macsec_priv(dev);
3751 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3752
3753 if (macsec->real_dev->mtu - extra < new_mtu)
3754 return -ERANGE;
3755
3756 dev->mtu = new_mtu;
3757
3758 return 0;
3759}
3760
3761static void macsec_get_stats64(struct net_device *dev,
3762 struct rtnl_link_stats64 *s)
3763{
3764 if (!dev->tstats)
3765 return;
3766
3767 dev_fetch_sw_netstats(s, dev->tstats);
3768
3769 s->rx_dropped = DEV_STATS_READ(dev, rx_dropped);
3770 s->tx_dropped = DEV_STATS_READ(dev, tx_dropped);
3771 s->rx_errors = DEV_STATS_READ(dev, rx_errors);
3772}
3773
3774static int macsec_get_iflink(const struct net_device *dev)
3775{
3776 return READ_ONCE(macsec_priv(dev)->real_dev->ifindex);
3777}
3778
3779static const struct net_device_ops macsec_netdev_ops = {
3780 .ndo_init = macsec_dev_init,
3781 .ndo_uninit = macsec_dev_uninit,
3782 .ndo_open = macsec_dev_open,
3783 .ndo_stop = macsec_dev_stop,
3784 .ndo_fix_features = macsec_fix_features,
3785 .ndo_change_mtu = macsec_change_mtu,
3786 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
3787 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
3788 .ndo_set_mac_address = macsec_set_mac_address,
3789 .ndo_start_xmit = macsec_start_xmit,
3790 .ndo_get_stats64 = macsec_get_stats64,
3791 .ndo_get_iflink = macsec_get_iflink,
3792};
3793
3794static const struct device_type macsec_type = {
3795 .name = "macsec",
3796};
3797
3798static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3799 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3800 [IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3801 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3802 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3803 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3804 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3805 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3806 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3807 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3808 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3809 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3810 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3811 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3812 [IFLA_MACSEC_OFFLOAD] = { .type = NLA_U8 },
3813};
3814
3815static void macsec_free_netdev(struct net_device *dev)
3816{
3817 struct macsec_dev *macsec = macsec_priv(dev);
3818
3819 if (macsec->secy.tx_sc.md_dst)
3820 metadata_dst_free(macsec->secy.tx_sc.md_dst);
3821 free_percpu(macsec->stats);
3822 free_percpu(macsec->secy.tx_sc.stats);
3823
3824 /* Get rid of the macsec's reference to real_dev */
3825 netdev_put(macsec->real_dev, &macsec->dev_tracker);
3826}
3827
3828static void macsec_setup(struct net_device *dev)
3829{
3830 ether_setup(dev);
3831 dev->min_mtu = 0;
3832 dev->max_mtu = ETH_MAX_MTU;
3833 dev->priv_flags |= IFF_NO_QUEUE;
3834 dev->netdev_ops = &macsec_netdev_ops;
3835 dev->needs_free_netdev = true;
3836 dev->priv_destructor = macsec_free_netdev;
3837 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3838
3839 eth_zero_addr(dev->broadcast);
3840}
3841
3842static int macsec_changelink_common(struct net_device *dev,
3843 struct nlattr *data[])
3844{
3845 struct macsec_secy *secy;
3846 struct macsec_tx_sc *tx_sc;
3847
3848 secy = &macsec_priv(dev)->secy;
3849 tx_sc = &secy->tx_sc;
3850
3851 if (data[IFLA_MACSEC_ENCODING_SA]) {
3852 struct macsec_tx_sa *tx_sa;
3853
3854 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3855 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3856
3857 secy->operational = tx_sa && tx_sa->active;
3858 }
3859
3860 if (data[IFLA_MACSEC_ENCRYPT])
3861 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3862
3863 if (data[IFLA_MACSEC_PROTECT])
3864 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3865
3866 if (data[IFLA_MACSEC_INC_SCI])
3867 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3868
3869 if (data[IFLA_MACSEC_ES])
3870 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3871
3872 if (data[IFLA_MACSEC_SCB])
3873 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3874
3875 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3876 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3877
3878 if (data[IFLA_MACSEC_VALIDATION])
3879 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3880
3881 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3882 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3883 case MACSEC_CIPHER_ID_GCM_AES_128:
3884 case MACSEC_DEFAULT_CIPHER_ID:
3885 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3886 secy->xpn = false;
3887 break;
3888 case MACSEC_CIPHER_ID_GCM_AES_256:
3889 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3890 secy->xpn = false;
3891 break;
3892 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
3893 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3894 secy->xpn = true;
3895 break;
3896 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
3897 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3898 secy->xpn = true;
3899 break;
3900 default:
3901 return -EINVAL;
3902 }
3903 }
3904
3905 if (data[IFLA_MACSEC_WINDOW]) {
3906 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3907
3908 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window
3909 * for XPN cipher suites */
3910 if (secy->xpn &&
3911 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW)
3912 return -EINVAL;
3913 }
3914
3915 return 0;
3916}
3917
3918static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3919 struct nlattr *data[],
3920 struct netlink_ext_ack *extack)
3921{
3922 struct macsec_dev *macsec = macsec_priv(dev);
3923 bool macsec_offload_state_change = false;
3924 enum macsec_offload offload;
3925 struct macsec_tx_sc tx_sc;
3926 struct macsec_secy secy;
3927 int ret;
3928
3929 if (!data)
3930 return 0;
3931
3932 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3933 data[IFLA_MACSEC_ICV_LEN] ||
3934 data[IFLA_MACSEC_SCI] ||
3935 data[IFLA_MACSEC_PORT])
3936 return -EINVAL;
3937
3938 /* Keep a copy of unmodified secy and tx_sc, in case the offload
3939 * propagation fails, to revert macsec_changelink_common.
3940 */
3941 memcpy(&secy, &macsec->secy, sizeof(secy));
3942 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3943
3944 ret = macsec_changelink_common(dev, data);
3945 if (ret)
3946 goto cleanup;
3947
3948 if (data[IFLA_MACSEC_OFFLOAD]) {
3949 offload = nla_get_u8(data[IFLA_MACSEC_OFFLOAD]);
3950 if (macsec->offload != offload) {
3951 macsec_offload_state_change = true;
3952 ret = macsec_update_offload(dev, offload);
3953 if (ret)
3954 goto cleanup;
3955 }
3956 }
3957
3958 /* If h/w offloading is available, propagate to the device */
3959 if (!macsec_offload_state_change && macsec_is_offloaded(macsec)) {
3960 const struct macsec_ops *ops;
3961 struct macsec_context ctx;
3962
3963 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3964 if (!ops) {
3965 ret = -EOPNOTSUPP;
3966 goto cleanup;
3967 }
3968
3969 ctx.secy = &macsec->secy;
3970 ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3971 if (ret)
3972 goto cleanup;
3973 }
3974
3975 return 0;
3976
3977cleanup:
3978 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3979 memcpy(&macsec->secy, &secy, sizeof(secy));
3980
3981 return ret;
3982}
3983
3984static void macsec_del_dev(struct macsec_dev *macsec)
3985{
3986 int i;
3987
3988 while (macsec->secy.rx_sc) {
3989 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3990
3991 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3992 free_rx_sc(rx_sc);
3993 }
3994
3995 for (i = 0; i < MACSEC_NUM_AN; i++) {
3996 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3997
3998 if (sa) {
3999 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
4000 clear_tx_sa(sa);
4001 }
4002 }
4003}
4004
4005static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
4006{
4007 struct macsec_dev *macsec = macsec_priv(dev);
4008 struct net_device *real_dev = macsec->real_dev;
4009
4010 /* If h/w offloading is available, propagate to the device */
4011 if (macsec_is_offloaded(macsec)) {
4012 const struct macsec_ops *ops;
4013 struct macsec_context ctx;
4014
4015 ops = macsec_get_ops(netdev_priv(dev), &ctx);
4016 if (ops) {
4017 ctx.secy = &macsec->secy;
4018 macsec_offload(ops->mdo_del_secy, &ctx);
4019 }
4020 }
4021
4022 unregister_netdevice_queue(dev, head);
4023 list_del_rcu(&macsec->secys);
4024 macsec_del_dev(macsec);
4025 netdev_upper_dev_unlink(real_dev, dev);
4026
4027 macsec_generation++;
4028}
4029
4030static void macsec_dellink(struct net_device *dev, struct list_head *head)
4031{
4032 struct macsec_dev *macsec = macsec_priv(dev);
4033 struct net_device *real_dev = macsec->real_dev;
4034 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
4035
4036 macsec_common_dellink(dev, head);
4037
4038 if (list_empty(&rxd->secys)) {
4039 netdev_rx_handler_unregister(real_dev);
4040 kfree(rxd);
4041 }
4042}
4043
4044static int register_macsec_dev(struct net_device *real_dev,
4045 struct net_device *dev)
4046{
4047 struct macsec_dev *macsec = macsec_priv(dev);
4048 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
4049
4050 if (!rxd) {
4051 int err;
4052
4053 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
4054 if (!rxd)
4055 return -ENOMEM;
4056
4057 INIT_LIST_HEAD(&rxd->secys);
4058
4059 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
4060 rxd);
4061 if (err < 0) {
4062 kfree(rxd);
4063 return err;
4064 }
4065 }
4066
4067 list_add_tail_rcu(&macsec->secys, &rxd->secys);
4068 return 0;
4069}
4070
4071static bool sci_exists(struct net_device *dev, sci_t sci)
4072{
4073 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
4074 struct macsec_dev *macsec;
4075
4076 list_for_each_entry(macsec, &rxd->secys, secys) {
4077 if (macsec->secy.sci == sci)
4078 return true;
4079 }
4080
4081 return false;
4082}
4083
4084static sci_t dev_to_sci(struct net_device *dev, __be16 port)
4085{
4086 return make_sci(dev->dev_addr, port);
4087}
4088
4089static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
4090{
4091 struct macsec_dev *macsec = macsec_priv(dev);
4092 struct macsec_secy *secy = &macsec->secy;
4093
4094 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
4095 if (!macsec->stats)
4096 return -ENOMEM;
4097
4098 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
4099 if (!secy->tx_sc.stats)
4100 return -ENOMEM;
4101
4102 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL);
4103 if (!secy->tx_sc.md_dst)
4104 /* macsec and secy percpu stats will be freed when unregistering
4105 * net_device in macsec_free_netdev()
4106 */
4107 return -ENOMEM;
4108
4109 if (sci == MACSEC_UNDEF_SCI)
4110 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4111
4112 secy->netdev = dev;
4113 secy->operational = true;
4114 secy->key_len = DEFAULT_SAK_LEN;
4115 secy->icv_len = icv_len;
4116 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
4117 secy->protect_frames = true;
4118 secy->replay_protect = false;
4119 secy->xpn = DEFAULT_XPN;
4120
4121 secy->sci = sci;
4122 secy->tx_sc.md_dst->u.macsec_info.sci = sci;
4123 secy->tx_sc.active = true;
4124 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
4125 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
4126 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
4127 secy->tx_sc.end_station = false;
4128 secy->tx_sc.scb = false;
4129
4130 return 0;
4131}
4132
4133static struct lock_class_key macsec_netdev_addr_lock_key;
4134
4135static int macsec_newlink(struct net *net, struct net_device *dev,
4136 struct nlattr *tb[], struct nlattr *data[],
4137 struct netlink_ext_ack *extack)
4138{
4139 struct macsec_dev *macsec = macsec_priv(dev);
4140 rx_handler_func_t *rx_handler;
4141 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4142 struct net_device *real_dev;
4143 int err, mtu;
4144 sci_t sci;
4145
4146 if (!tb[IFLA_LINK])
4147 return -EINVAL;
4148 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
4149 if (!real_dev)
4150 return -ENODEV;
4151 if (real_dev->type != ARPHRD_ETHER)
4152 return -EINVAL;
4153
4154 dev->priv_flags |= IFF_MACSEC;
4155
4156 macsec->real_dev = real_dev;
4157
4158 if (data && data[IFLA_MACSEC_OFFLOAD])
4159 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
4160 else
4161 /* MACsec offloading is off by default */
4162 macsec->offload = MACSEC_OFFLOAD_OFF;
4163
4164 /* Check if the offloading mode is supported by the underlying layers */
4165 if (macsec->offload != MACSEC_OFFLOAD_OFF &&
4166 !macsec_check_offload(macsec->offload, macsec))
4167 return -EOPNOTSUPP;
4168
4169 /* send_sci must be set to true when transmit sci explicitly is set */
4170 if ((data && data[IFLA_MACSEC_SCI]) &&
4171 (data && data[IFLA_MACSEC_INC_SCI])) {
4172 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
4173
4174 if (!send_sci)
4175 return -EINVAL;
4176 }
4177
4178 if (data && data[IFLA_MACSEC_ICV_LEN])
4179 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4180 mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
4181 if (mtu < 0)
4182 dev->mtu = 0;
4183 else
4184 dev->mtu = mtu;
4185
4186 rx_handler = rtnl_dereference(real_dev->rx_handler);
4187 if (rx_handler && rx_handler != macsec_handle_frame)
4188 return -EBUSY;
4189
4190 err = register_netdevice(dev);
4191 if (err < 0)
4192 return err;
4193
4194 netdev_lockdep_set_classes(dev);
4195 lockdep_set_class(&dev->addr_list_lock,
4196 &macsec_netdev_addr_lock_key);
4197
4198 err = netdev_upper_dev_link(real_dev, dev, extack);
4199 if (err < 0)
4200 goto unregister;
4201
4202 /* need to be already registered so that ->init has run and
4203 * the MAC addr is set
4204 */
4205 if (data && data[IFLA_MACSEC_SCI])
4206 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
4207 else if (data && data[IFLA_MACSEC_PORT])
4208 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
4209 else
4210 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4211
4212 if (rx_handler && sci_exists(real_dev, sci)) {
4213 err = -EBUSY;
4214 goto unlink;
4215 }
4216
4217 err = macsec_add_dev(dev, sci, icv_len);
4218 if (err)
4219 goto unlink;
4220
4221 if (data) {
4222 err = macsec_changelink_common(dev, data);
4223 if (err)
4224 goto del_dev;
4225 }
4226
4227 /* If h/w offloading is available, propagate to the device */
4228 if (macsec_is_offloaded(macsec)) {
4229 const struct macsec_ops *ops;
4230 struct macsec_context ctx;
4231
4232 ops = macsec_get_ops(macsec, &ctx);
4233 if (ops) {
4234 ctx.secy = &macsec->secy;
4235 err = macsec_offload(ops->mdo_add_secy, &ctx);
4236 if (err)
4237 goto del_dev;
4238
4239 macsec->insert_tx_tag =
4240 macsec_needs_tx_tag(macsec, ops);
4241 }
4242 }
4243
4244 err = register_macsec_dev(real_dev, dev);
4245 if (err < 0)
4246 goto del_dev;
4247
4248 netif_stacked_transfer_operstate(real_dev, dev);
4249 linkwatch_fire_event(dev);
4250
4251 macsec_generation++;
4252
4253 return 0;
4254
4255del_dev:
4256 macsec_del_dev(macsec);
4257unlink:
4258 netdev_upper_dev_unlink(real_dev, dev);
4259unregister:
4260 unregister_netdevice(dev);
4261 return err;
4262}
4263
4264static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
4265 struct netlink_ext_ack *extack)
4266{
4267 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
4268 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4269 int flag;
4270 bool es, scb, sci;
4271
4272 if (!data)
4273 return 0;
4274
4275 if (data[IFLA_MACSEC_CIPHER_SUITE])
4276 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
4277
4278 if (data[IFLA_MACSEC_ICV_LEN]) {
4279 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4280 if (icv_len != MACSEC_DEFAULT_ICV_LEN) {
4281 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
4282 struct crypto_aead *dummy_tfm;
4283
4284 dummy_tfm = macsec_alloc_tfm(dummy_key,
4285 DEFAULT_SAK_LEN,
4286 icv_len);
4287 if (IS_ERR(dummy_tfm))
4288 return PTR_ERR(dummy_tfm);
4289 crypto_free_aead(dummy_tfm);
4290 }
4291 }
4292
4293 switch (csid) {
4294 case MACSEC_CIPHER_ID_GCM_AES_128:
4295 case MACSEC_CIPHER_ID_GCM_AES_256:
4296 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
4297 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
4298 case MACSEC_DEFAULT_CIPHER_ID:
4299 if (icv_len < MACSEC_MIN_ICV_LEN ||
4300 icv_len > MACSEC_STD_ICV_LEN)
4301 return -EINVAL;
4302 break;
4303 default:
4304 return -EINVAL;
4305 }
4306
4307 if (data[IFLA_MACSEC_ENCODING_SA]) {
4308 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
4309 return -EINVAL;
4310 }
4311
4312 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
4313 flag < IFLA_MACSEC_VALIDATION;
4314 flag++) {
4315 if (data[flag]) {
4316 if (nla_get_u8(data[flag]) > 1)
4317 return -EINVAL;
4318 }
4319 }
4320
4321 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
4322 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
4323 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
4324
4325 if ((sci && (scb || es)) || (scb && es))
4326 return -EINVAL;
4327
4328 if (data[IFLA_MACSEC_VALIDATION] &&
4329 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
4330 return -EINVAL;
4331
4332 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
4333 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
4334 !data[IFLA_MACSEC_WINDOW])
4335 return -EINVAL;
4336
4337 return 0;
4338}
4339
4340static struct net *macsec_get_link_net(const struct net_device *dev)
4341{
4342 return dev_net(macsec_priv(dev)->real_dev);
4343}
4344
4345struct net_device *macsec_get_real_dev(const struct net_device *dev)
4346{
4347 return macsec_priv(dev)->real_dev;
4348}
4349EXPORT_SYMBOL_GPL(macsec_get_real_dev);
4350
4351bool macsec_netdev_is_offloaded(struct net_device *dev)
4352{
4353 return macsec_is_offloaded(macsec_priv(dev));
4354}
4355EXPORT_SYMBOL_GPL(macsec_netdev_is_offloaded);
4356
4357static size_t macsec_get_size(const struct net_device *dev)
4358{
4359 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
4360 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
4361 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
4362 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
4363 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
4364 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
4365 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
4366 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
4367 nla_total_size(1) + /* IFLA_MACSEC_ES */
4368 nla_total_size(1) + /* IFLA_MACSEC_SCB */
4369 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
4370 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
4371 nla_total_size(1) + /* IFLA_MACSEC_OFFLOAD */
4372 0;
4373}
4374
4375static int macsec_fill_info(struct sk_buff *skb,
4376 const struct net_device *dev)
4377{
4378 struct macsec_tx_sc *tx_sc;
4379 struct macsec_dev *macsec;
4380 struct macsec_secy *secy;
4381 u64 csid;
4382
4383 macsec = macsec_priv(dev);
4384 secy = &macsec->secy;
4385 tx_sc = &secy->tx_sc;
4386
4387 switch (secy->key_len) {
4388 case MACSEC_GCM_AES_128_SAK_LEN:
4389 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
4390 break;
4391 case MACSEC_GCM_AES_256_SAK_LEN:
4392 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
4393 break;
4394 default:
4395 goto nla_put_failure;
4396 }
4397
4398 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
4399 IFLA_MACSEC_PAD) ||
4400 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
4401 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
4402 csid, IFLA_MACSEC_PAD) ||
4403 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
4404 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
4405 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
4406 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
4407 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
4408 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
4409 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
4410 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
4411 nla_put_u8(skb, IFLA_MACSEC_OFFLOAD, macsec->offload) ||
4412 0)
4413 goto nla_put_failure;
4414
4415 if (secy->replay_protect) {
4416 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
4417 goto nla_put_failure;
4418 }
4419
4420 return 0;
4421
4422nla_put_failure:
4423 return -EMSGSIZE;
4424}
4425
4426static struct rtnl_link_ops macsec_link_ops __read_mostly = {
4427 .kind = "macsec",
4428 .priv_size = sizeof(struct macsec_dev),
4429 .maxtype = IFLA_MACSEC_MAX,
4430 .policy = macsec_rtnl_policy,
4431 .setup = macsec_setup,
4432 .validate = macsec_validate_attr,
4433 .newlink = macsec_newlink,
4434 .changelink = macsec_changelink,
4435 .dellink = macsec_dellink,
4436 .get_size = macsec_get_size,
4437 .fill_info = macsec_fill_info,
4438 .get_link_net = macsec_get_link_net,
4439};
4440
4441static bool is_macsec_master(struct net_device *dev)
4442{
4443 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
4444}
4445
4446static int macsec_notify(struct notifier_block *this, unsigned long event,
4447 void *ptr)
4448{
4449 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
4450 LIST_HEAD(head);
4451
4452 if (!is_macsec_master(real_dev))
4453 return NOTIFY_DONE;
4454
4455 switch (event) {
4456 case NETDEV_DOWN:
4457 case NETDEV_UP:
4458 case NETDEV_CHANGE: {
4459 struct macsec_dev *m, *n;
4460 struct macsec_rxh_data *rxd;
4461
4462 rxd = macsec_data_rtnl(real_dev);
4463 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4464 struct net_device *dev = m->secy.netdev;
4465
4466 netif_stacked_transfer_operstate(real_dev, dev);
4467 }
4468 break;
4469 }
4470 case NETDEV_UNREGISTER: {
4471 struct macsec_dev *m, *n;
4472 struct macsec_rxh_data *rxd;
4473
4474 rxd = macsec_data_rtnl(real_dev);
4475 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4476 macsec_common_dellink(m->secy.netdev, &head);
4477 }
4478
4479 netdev_rx_handler_unregister(real_dev);
4480 kfree(rxd);
4481
4482 unregister_netdevice_many(&head);
4483 break;
4484 }
4485 case NETDEV_CHANGEMTU: {
4486 struct macsec_dev *m;
4487 struct macsec_rxh_data *rxd;
4488
4489 rxd = macsec_data_rtnl(real_dev);
4490 list_for_each_entry(m, &rxd->secys, secys) {
4491 struct net_device *dev = m->secy.netdev;
4492 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
4493 macsec_extra_len(true));
4494
4495 if (dev->mtu > mtu)
4496 dev_set_mtu(dev, mtu);
4497 }
4498 }
4499 }
4500
4501 return NOTIFY_OK;
4502}
4503
4504static struct notifier_block macsec_notifier = {
4505 .notifier_call = macsec_notify,
4506};
4507
4508static int __init macsec_init(void)
4509{
4510 int err;
4511
4512 pr_info("MACsec IEEE 802.1AE\n");
4513 err = register_netdevice_notifier(&macsec_notifier);
4514 if (err)
4515 return err;
4516
4517 err = rtnl_link_register(&macsec_link_ops);
4518 if (err)
4519 goto notifier;
4520
4521 err = genl_register_family(&macsec_fam);
4522 if (err)
4523 goto rtnl;
4524
4525 return 0;
4526
4527rtnl:
4528 rtnl_link_unregister(&macsec_link_ops);
4529notifier:
4530 unregister_netdevice_notifier(&macsec_notifier);
4531 return err;
4532}
4533
4534static void __exit macsec_exit(void)
4535{
4536 genl_unregister_family(&macsec_fam);
4537 rtnl_link_unregister(&macsec_link_ops);
4538 unregister_netdevice_notifier(&macsec_notifier);
4539 rcu_barrier();
4540}
4541
4542module_init(macsec_init);
4543module_exit(macsec_exit);
4544
4545MODULE_ALIAS_RTNL_LINK("macsec");
4546MODULE_ALIAS_GENL_FAMILY("macsec");
4547
4548MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
4549MODULE_LICENSE("GPL v2");