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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 <linux/phy.h>
22#include <linux/byteorder/generic.h>
23#include <linux/if_arp.h>
24
25#include <uapi/linux/if_macsec.h>
26
27#define MACSEC_SCI_LEN 8
28
29/* SecTAG length = macsec_eth_header without the optional SCI */
30#define MACSEC_TAG_LEN 6
31
32struct macsec_eth_header {
33 struct ethhdr eth;
34 /* SecTAG */
35 u8 tci_an;
36#if defined(__LITTLE_ENDIAN_BITFIELD)
37 u8 short_length:6,
38 unused:2;
39#elif defined(__BIG_ENDIAN_BITFIELD)
40 u8 unused:2,
41 short_length:6;
42#else
43#error "Please fix <asm/byteorder.h>"
44#endif
45 __be32 packet_number;
46 u8 secure_channel_id[8]; /* optional */
47} __packed;
48
49#define MACSEC_TCI_VERSION 0x80
50#define MACSEC_TCI_ES 0x40 /* end station */
51#define MACSEC_TCI_SC 0x20 /* SCI present */
52#define MACSEC_TCI_SCB 0x10 /* epon */
53#define MACSEC_TCI_E 0x08 /* encryption */
54#define MACSEC_TCI_C 0x04 /* changed text */
55#define MACSEC_AN_MASK 0x03 /* association number */
56#define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
57
58/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
59#define MIN_NON_SHORT_LEN 48
60
61#define GCM_AES_IV_LEN 12
62#define DEFAULT_ICV_LEN 16
63
64#define for_each_rxsc(secy, sc) \
65 for (sc = rcu_dereference_bh(secy->rx_sc); \
66 sc; \
67 sc = rcu_dereference_bh(sc->next))
68#define for_each_rxsc_rtnl(secy, sc) \
69 for (sc = rtnl_dereference(secy->rx_sc); \
70 sc; \
71 sc = rtnl_dereference(sc->next))
72
73#define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31)))
74
75struct gcm_iv_xpn {
76 union {
77 u8 short_secure_channel_id[4];
78 ssci_t ssci;
79 };
80 __be64 pn;
81} __packed;
82
83struct gcm_iv {
84 union {
85 u8 secure_channel_id[8];
86 sci_t sci;
87 };
88 __be32 pn;
89};
90
91#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
92
93struct pcpu_secy_stats {
94 struct macsec_dev_stats stats;
95 struct u64_stats_sync syncp;
96};
97
98/**
99 * struct macsec_dev - private data
100 * @secy: SecY config
101 * @real_dev: pointer to underlying netdevice
102 * @stats: MACsec device stats
103 * @secys: linked list of SecY's on the underlying device
104 * @gro_cells: pointer to the Generic Receive Offload cell
105 * @offload: status of offloading on the MACsec device
106 */
107struct macsec_dev {
108 struct macsec_secy secy;
109 struct net_device *real_dev;
110 struct pcpu_secy_stats __percpu *stats;
111 struct list_head secys;
112 struct gro_cells gro_cells;
113 enum macsec_offload offload;
114};
115
116/**
117 * struct macsec_rxh_data - rx_handler private argument
118 * @secys: linked list of SecY's on this underlying device
119 */
120struct macsec_rxh_data {
121 struct list_head secys;
122};
123
124static struct macsec_dev *macsec_priv(const struct net_device *dev)
125{
126 return (struct macsec_dev *)netdev_priv(dev);
127}
128
129static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
130{
131 return rcu_dereference_bh(dev->rx_handler_data);
132}
133
134static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
135{
136 return rtnl_dereference(dev->rx_handler_data);
137}
138
139struct macsec_cb {
140 struct aead_request *req;
141 union {
142 struct macsec_tx_sa *tx_sa;
143 struct macsec_rx_sa *rx_sa;
144 };
145 u8 assoc_num;
146 bool valid;
147 bool has_sci;
148};
149
150static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
151{
152 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
153
154 if (!sa || !sa->active)
155 return NULL;
156
157 if (!refcount_inc_not_zero(&sa->refcnt))
158 return NULL;
159
160 return sa;
161}
162
163static void free_rx_sc_rcu(struct rcu_head *head)
164{
165 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
166
167 free_percpu(rx_sc->stats);
168 kfree(rx_sc);
169}
170
171static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
172{
173 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
174}
175
176static void macsec_rxsc_put(struct macsec_rx_sc *sc)
177{
178 if (refcount_dec_and_test(&sc->refcnt))
179 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
180}
181
182static void free_rxsa(struct rcu_head *head)
183{
184 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
185
186 crypto_free_aead(sa->key.tfm);
187 free_percpu(sa->stats);
188 kfree(sa);
189}
190
191static void macsec_rxsa_put(struct macsec_rx_sa *sa)
192{
193 if (refcount_dec_and_test(&sa->refcnt))
194 call_rcu(&sa->rcu, free_rxsa);
195}
196
197static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
198{
199 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
200
201 if (!sa || !sa->active)
202 return NULL;
203
204 if (!refcount_inc_not_zero(&sa->refcnt))
205 return NULL;
206
207 return sa;
208}
209
210static void free_txsa(struct rcu_head *head)
211{
212 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
213
214 crypto_free_aead(sa->key.tfm);
215 free_percpu(sa->stats);
216 kfree(sa);
217}
218
219static void macsec_txsa_put(struct macsec_tx_sa *sa)
220{
221 if (refcount_dec_and_test(&sa->refcnt))
222 call_rcu(&sa->rcu, free_txsa);
223}
224
225static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
226{
227 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
228 return (struct macsec_cb *)skb->cb;
229}
230
231#define MACSEC_PORT_ES (htons(0x0001))
232#define MACSEC_PORT_SCB (0x0000)
233#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
234#define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
235
236#define MACSEC_GCM_AES_128_SAK_LEN 16
237#define MACSEC_GCM_AES_256_SAK_LEN 32
238
239#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
240#define DEFAULT_XPN false
241#define DEFAULT_SEND_SCI true
242#define DEFAULT_ENCRYPT false
243#define DEFAULT_ENCODING_SA 0
244
245static bool send_sci(const struct macsec_secy *secy)
246{
247 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
248
249 return tx_sc->send_sci ||
250 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
251}
252
253static sci_t make_sci(u8 *addr, __be16 port)
254{
255 sci_t sci;
256
257 memcpy(&sci, addr, ETH_ALEN);
258 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
259
260 return sci;
261}
262
263static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
264{
265 sci_t sci;
266
267 if (sci_present)
268 memcpy(&sci, hdr->secure_channel_id,
269 sizeof(hdr->secure_channel_id));
270 else
271 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
272
273 return sci;
274}
275
276static unsigned int macsec_sectag_len(bool sci_present)
277{
278 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
279}
280
281static unsigned int macsec_hdr_len(bool sci_present)
282{
283 return macsec_sectag_len(sci_present) + ETH_HLEN;
284}
285
286static unsigned int macsec_extra_len(bool sci_present)
287{
288 return macsec_sectag_len(sci_present) + sizeof(__be16);
289}
290
291/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
292static void macsec_fill_sectag(struct macsec_eth_header *h,
293 const struct macsec_secy *secy, u32 pn,
294 bool sci_present)
295{
296 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
297
298 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
299 h->eth.h_proto = htons(ETH_P_MACSEC);
300
301 if (sci_present) {
302 h->tci_an |= MACSEC_TCI_SC;
303 memcpy(&h->secure_channel_id, &secy->sci,
304 sizeof(h->secure_channel_id));
305 } else {
306 if (tx_sc->end_station)
307 h->tci_an |= MACSEC_TCI_ES;
308 if (tx_sc->scb)
309 h->tci_an |= MACSEC_TCI_SCB;
310 }
311
312 h->packet_number = htonl(pn);
313
314 /* with GCM, C/E clear for !encrypt, both set for encrypt */
315 if (tx_sc->encrypt)
316 h->tci_an |= MACSEC_TCI_CONFID;
317 else if (secy->icv_len != DEFAULT_ICV_LEN)
318 h->tci_an |= MACSEC_TCI_C;
319
320 h->tci_an |= tx_sc->encoding_sa;
321}
322
323static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
324{
325 if (data_len < MIN_NON_SHORT_LEN)
326 h->short_length = data_len;
327}
328
329/* Checks if a MACsec interface is being offloaded to an hardware engine */
330static bool macsec_is_offloaded(struct macsec_dev *macsec)
331{
332 if (macsec->offload == MACSEC_OFFLOAD_MAC ||
333 macsec->offload == MACSEC_OFFLOAD_PHY)
334 return true;
335
336 return false;
337}
338
339/* Checks if underlying layers implement MACsec offloading functions. */
340static bool macsec_check_offload(enum macsec_offload offload,
341 struct macsec_dev *macsec)
342{
343 if (!macsec || !macsec->real_dev)
344 return false;
345
346 if (offload == MACSEC_OFFLOAD_PHY)
347 return macsec->real_dev->phydev &&
348 macsec->real_dev->phydev->macsec_ops;
349 else if (offload == MACSEC_OFFLOAD_MAC)
350 return macsec->real_dev->features & NETIF_F_HW_MACSEC &&
351 macsec->real_dev->macsec_ops;
352
353 return false;
354}
355
356static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload,
357 struct macsec_dev *macsec,
358 struct macsec_context *ctx)
359{
360 if (ctx) {
361 memset(ctx, 0, sizeof(*ctx));
362 ctx->offload = offload;
363
364 if (offload == MACSEC_OFFLOAD_PHY)
365 ctx->phydev = macsec->real_dev->phydev;
366 else if (offload == MACSEC_OFFLOAD_MAC)
367 ctx->netdev = macsec->real_dev;
368 }
369
370 if (offload == MACSEC_OFFLOAD_PHY)
371 return macsec->real_dev->phydev->macsec_ops;
372 else
373 return macsec->real_dev->macsec_ops;
374}
375
376/* Returns a pointer to the MACsec ops struct if any and updates the MACsec
377 * context device reference if provided.
378 */
379static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
380 struct macsec_context *ctx)
381{
382 if (!macsec_check_offload(macsec->offload, macsec))
383 return NULL;
384
385 return __macsec_get_ops(macsec->offload, macsec, ctx);
386}
387
388/* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */
389static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn)
390{
391 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
392 int len = skb->len - 2 * ETH_ALEN;
393 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
394
395 /* a) It comprises at least 17 octets */
396 if (skb->len <= 16)
397 return false;
398
399 /* b) MACsec EtherType: already checked */
400
401 /* c) V bit is clear */
402 if (h->tci_an & MACSEC_TCI_VERSION)
403 return false;
404
405 /* d) ES or SCB => !SC */
406 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
407 (h->tci_an & MACSEC_TCI_SC))
408 return false;
409
410 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
411 if (h->unused)
412 return false;
413
414 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */
415 if (!h->packet_number && !xpn)
416 return false;
417
418 /* length check, f) g) h) i) */
419 if (h->short_length)
420 return len == extra_len + h->short_length;
421 return len >= extra_len + MIN_NON_SHORT_LEN;
422}
423
424#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
425#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
426
427static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn,
428 salt_t salt)
429{
430 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv;
431
432 gcm_iv->ssci = ssci ^ salt.ssci;
433 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn;
434}
435
436static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
437{
438 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
439
440 gcm_iv->sci = sci;
441 gcm_iv->pn = htonl(pn);
442}
443
444static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
445{
446 return (struct macsec_eth_header *)skb_mac_header(skb);
447}
448
449static sci_t dev_to_sci(struct net_device *dev, __be16 port)
450{
451 return make_sci(dev->dev_addr, port);
452}
453
454static void __macsec_pn_wrapped(struct macsec_secy *secy,
455 struct macsec_tx_sa *tx_sa)
456{
457 pr_debug("PN wrapped, transitioning to !oper\n");
458 tx_sa->active = false;
459 if (secy->protect_frames)
460 secy->operational = false;
461}
462
463void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
464{
465 spin_lock_bh(&tx_sa->lock);
466 __macsec_pn_wrapped(secy, tx_sa);
467 spin_unlock_bh(&tx_sa->lock);
468}
469EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
470
471static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
472 struct macsec_secy *secy)
473{
474 pn_t pn;
475
476 spin_lock_bh(&tx_sa->lock);
477
478 pn = tx_sa->next_pn_halves;
479 if (secy->xpn)
480 tx_sa->next_pn++;
481 else
482 tx_sa->next_pn_halves.lower++;
483
484 if (tx_sa->next_pn == 0)
485 __macsec_pn_wrapped(secy, tx_sa);
486 spin_unlock_bh(&tx_sa->lock);
487
488 return pn;
489}
490
491static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
492{
493 struct macsec_dev *macsec = netdev_priv(dev);
494
495 skb->dev = macsec->real_dev;
496 skb_reset_mac_header(skb);
497 skb->protocol = eth_hdr(skb)->h_proto;
498}
499
500static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
501 struct macsec_tx_sa *tx_sa)
502{
503 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
504
505 u64_stats_update_begin(&txsc_stats->syncp);
506 if (tx_sc->encrypt) {
507 txsc_stats->stats.OutOctetsEncrypted += skb->len;
508 txsc_stats->stats.OutPktsEncrypted++;
509 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
510 } else {
511 txsc_stats->stats.OutOctetsProtected += skb->len;
512 txsc_stats->stats.OutPktsProtected++;
513 this_cpu_inc(tx_sa->stats->OutPktsProtected);
514 }
515 u64_stats_update_end(&txsc_stats->syncp);
516}
517
518static void count_tx(struct net_device *dev, int ret, int len)
519{
520 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
521 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
522
523 u64_stats_update_begin(&stats->syncp);
524 stats->tx_packets++;
525 stats->tx_bytes += len;
526 u64_stats_update_end(&stats->syncp);
527 }
528}
529
530static void macsec_encrypt_done(struct crypto_async_request *base, int err)
531{
532 struct sk_buff *skb = base->data;
533 struct net_device *dev = skb->dev;
534 struct macsec_dev *macsec = macsec_priv(dev);
535 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
536 int len, ret;
537
538 aead_request_free(macsec_skb_cb(skb)->req);
539
540 rcu_read_lock_bh();
541 macsec_encrypt_finish(skb, dev);
542 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
543 len = skb->len;
544 ret = dev_queue_xmit(skb);
545 count_tx(dev, ret, len);
546 rcu_read_unlock_bh();
547
548 macsec_txsa_put(sa);
549 dev_put(dev);
550}
551
552static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
553 unsigned char **iv,
554 struct scatterlist **sg,
555 int num_frags)
556{
557 size_t size, iv_offset, sg_offset;
558 struct aead_request *req;
559 void *tmp;
560
561 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
562 iv_offset = size;
563 size += GCM_AES_IV_LEN;
564
565 size = ALIGN(size, __alignof__(struct scatterlist));
566 sg_offset = size;
567 size += sizeof(struct scatterlist) * num_frags;
568
569 tmp = kmalloc(size, GFP_ATOMIC);
570 if (!tmp)
571 return NULL;
572
573 *iv = (unsigned char *)(tmp + iv_offset);
574 *sg = (struct scatterlist *)(tmp + sg_offset);
575 req = tmp;
576
577 aead_request_set_tfm(req, tfm);
578
579 return req;
580}
581
582static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
583 struct net_device *dev)
584{
585 int ret;
586 struct scatterlist *sg;
587 struct sk_buff *trailer;
588 unsigned char *iv;
589 struct ethhdr *eth;
590 struct macsec_eth_header *hh;
591 size_t unprotected_len;
592 struct aead_request *req;
593 struct macsec_secy *secy;
594 struct macsec_tx_sc *tx_sc;
595 struct macsec_tx_sa *tx_sa;
596 struct macsec_dev *macsec = macsec_priv(dev);
597 bool sci_present;
598 pn_t pn;
599
600 secy = &macsec->secy;
601 tx_sc = &secy->tx_sc;
602
603 /* 10.5.1 TX SA assignment */
604 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
605 if (!tx_sa) {
606 secy->operational = false;
607 kfree_skb(skb);
608 return ERR_PTR(-EINVAL);
609 }
610
611 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
612 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
613 struct sk_buff *nskb = skb_copy_expand(skb,
614 MACSEC_NEEDED_HEADROOM,
615 MACSEC_NEEDED_TAILROOM,
616 GFP_ATOMIC);
617 if (likely(nskb)) {
618 consume_skb(skb);
619 skb = nskb;
620 } else {
621 macsec_txsa_put(tx_sa);
622 kfree_skb(skb);
623 return ERR_PTR(-ENOMEM);
624 }
625 } else {
626 skb = skb_unshare(skb, GFP_ATOMIC);
627 if (!skb) {
628 macsec_txsa_put(tx_sa);
629 return ERR_PTR(-ENOMEM);
630 }
631 }
632
633 unprotected_len = skb->len;
634 eth = eth_hdr(skb);
635 sci_present = send_sci(secy);
636 hh = skb_push(skb, macsec_extra_len(sci_present));
637 memmove(hh, eth, 2 * ETH_ALEN);
638
639 pn = tx_sa_update_pn(tx_sa, secy);
640 if (pn.full64 == 0) {
641 macsec_txsa_put(tx_sa);
642 kfree_skb(skb);
643 return ERR_PTR(-ENOLINK);
644 }
645 macsec_fill_sectag(hh, secy, pn.lower, sci_present);
646 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
647
648 skb_put(skb, secy->icv_len);
649
650 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
651 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
652
653 u64_stats_update_begin(&secy_stats->syncp);
654 secy_stats->stats.OutPktsTooLong++;
655 u64_stats_update_end(&secy_stats->syncp);
656
657 macsec_txsa_put(tx_sa);
658 kfree_skb(skb);
659 return ERR_PTR(-EINVAL);
660 }
661
662 ret = skb_cow_data(skb, 0, &trailer);
663 if (unlikely(ret < 0)) {
664 macsec_txsa_put(tx_sa);
665 kfree_skb(skb);
666 return ERR_PTR(ret);
667 }
668
669 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
670 if (!req) {
671 macsec_txsa_put(tx_sa);
672 kfree_skb(skb);
673 return ERR_PTR(-ENOMEM);
674 }
675
676 if (secy->xpn)
677 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt);
678 else
679 macsec_fill_iv(iv, secy->sci, pn.lower);
680
681 sg_init_table(sg, ret);
682 ret = skb_to_sgvec(skb, sg, 0, skb->len);
683 if (unlikely(ret < 0)) {
684 aead_request_free(req);
685 macsec_txsa_put(tx_sa);
686 kfree_skb(skb);
687 return ERR_PTR(ret);
688 }
689
690 if (tx_sc->encrypt) {
691 int len = skb->len - macsec_hdr_len(sci_present) -
692 secy->icv_len;
693 aead_request_set_crypt(req, sg, sg, len, iv);
694 aead_request_set_ad(req, macsec_hdr_len(sci_present));
695 } else {
696 aead_request_set_crypt(req, sg, sg, 0, iv);
697 aead_request_set_ad(req, skb->len - secy->icv_len);
698 }
699
700 macsec_skb_cb(skb)->req = req;
701 macsec_skb_cb(skb)->tx_sa = tx_sa;
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 return false;
744 }
745
746 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
747 u64_stats_update_begin(&rxsc_stats->syncp);
748 if (hdr->tci_an & MACSEC_TCI_E)
749 rxsc_stats->stats.InOctetsDecrypted += skb->len;
750 else
751 rxsc_stats->stats.InOctetsValidated += skb->len;
752 u64_stats_update_end(&rxsc_stats->syncp);
753 }
754
755 if (!macsec_skb_cb(skb)->valid) {
756 spin_unlock(&rx_sa->lock);
757
758 /* 10.6.5 */
759 if (hdr->tci_an & MACSEC_TCI_C ||
760 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
761 u64_stats_update_begin(&rxsc_stats->syncp);
762 rxsc_stats->stats.InPktsNotValid++;
763 u64_stats_update_end(&rxsc_stats->syncp);
764 return false;
765 }
766
767 u64_stats_update_begin(&rxsc_stats->syncp);
768 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
769 rxsc_stats->stats.InPktsInvalid++;
770 this_cpu_inc(rx_sa->stats->InPktsInvalid);
771 } else if (pn < lowest_pn) {
772 rxsc_stats->stats.InPktsDelayed++;
773 } else {
774 rxsc_stats->stats.InPktsUnchecked++;
775 }
776 u64_stats_update_end(&rxsc_stats->syncp);
777 } else {
778 u64_stats_update_begin(&rxsc_stats->syncp);
779 if (pn < lowest_pn) {
780 rxsc_stats->stats.InPktsDelayed++;
781 } else {
782 rxsc_stats->stats.InPktsOK++;
783 this_cpu_inc(rx_sa->stats->InPktsOK);
784 }
785 u64_stats_update_end(&rxsc_stats->syncp);
786
787 // Instead of "pn >=" - to support pn overflow in xpn
788 if (pn + 1 > rx_sa->next_pn_halves.lower) {
789 rx_sa->next_pn_halves.lower = pn + 1;
790 } else if (secy->xpn &&
791 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
792 rx_sa->next_pn_halves.upper++;
793 rx_sa->next_pn_halves.lower = pn + 1;
794 }
795
796 spin_unlock(&rx_sa->lock);
797 }
798
799 return true;
800}
801
802static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
803{
804 skb->pkt_type = PACKET_HOST;
805 skb->protocol = eth_type_trans(skb, dev);
806
807 skb_reset_network_header(skb);
808 if (!skb_transport_header_was_set(skb))
809 skb_reset_transport_header(skb);
810 skb_reset_mac_len(skb);
811}
812
813static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
814{
815 skb->ip_summed = CHECKSUM_NONE;
816 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
817 skb_pull(skb, hdr_len);
818 pskb_trim_unique(skb, skb->len - icv_len);
819}
820
821static void count_rx(struct net_device *dev, int len)
822{
823 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
824
825 u64_stats_update_begin(&stats->syncp);
826 stats->rx_packets++;
827 stats->rx_bytes += len;
828 u64_stats_update_end(&stats->syncp);
829}
830
831static void macsec_decrypt_done(struct crypto_async_request *base, int err)
832{
833 struct sk_buff *skb = base->data;
834 struct net_device *dev = skb->dev;
835 struct macsec_dev *macsec = macsec_priv(dev);
836 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
837 struct macsec_rx_sc *rx_sc = rx_sa->sc;
838 int len;
839 u32 pn;
840
841 aead_request_free(macsec_skb_cb(skb)->req);
842
843 if (!err)
844 macsec_skb_cb(skb)->valid = true;
845
846 rcu_read_lock_bh();
847 pn = ntohl(macsec_ethhdr(skb)->packet_number);
848 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
849 rcu_read_unlock_bh();
850 kfree_skb(skb);
851 goto out;
852 }
853
854 macsec_finalize_skb(skb, macsec->secy.icv_len,
855 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
856 macsec_reset_skb(skb, macsec->secy.netdev);
857
858 len = skb->len;
859 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
860 count_rx(dev, len);
861
862 rcu_read_unlock_bh();
863
864out:
865 macsec_rxsa_put(rx_sa);
866 macsec_rxsc_put(rx_sc);
867 dev_put(dev);
868}
869
870static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
871 struct net_device *dev,
872 struct macsec_rx_sa *rx_sa,
873 sci_t sci,
874 struct macsec_secy *secy)
875{
876 int ret;
877 struct scatterlist *sg;
878 struct sk_buff *trailer;
879 unsigned char *iv;
880 struct aead_request *req;
881 struct macsec_eth_header *hdr;
882 u32 hdr_pn;
883 u16 icv_len = secy->icv_len;
884
885 macsec_skb_cb(skb)->valid = false;
886 skb = skb_share_check(skb, GFP_ATOMIC);
887 if (!skb)
888 return ERR_PTR(-ENOMEM);
889
890 ret = skb_cow_data(skb, 0, &trailer);
891 if (unlikely(ret < 0)) {
892 kfree_skb(skb);
893 return ERR_PTR(ret);
894 }
895 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
896 if (!req) {
897 kfree_skb(skb);
898 return ERR_PTR(-ENOMEM);
899 }
900
901 hdr = (struct macsec_eth_header *)skb->data;
902 hdr_pn = ntohl(hdr->packet_number);
903
904 if (secy->xpn) {
905 pn_t recovered_pn = rx_sa->next_pn_halves;
906
907 recovered_pn.lower = hdr_pn;
908 if (hdr_pn < rx_sa->next_pn_halves.lower &&
909 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
910 recovered_pn.upper++;
911
912 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
913 rx_sa->key.salt);
914 } else {
915 macsec_fill_iv(iv, sci, hdr_pn);
916 }
917
918 sg_init_table(sg, ret);
919 ret = skb_to_sgvec(skb, sg, 0, skb->len);
920 if (unlikely(ret < 0)) {
921 aead_request_free(req);
922 kfree_skb(skb);
923 return ERR_PTR(ret);
924 }
925
926 if (hdr->tci_an & MACSEC_TCI_E) {
927 /* confidentiality: ethernet + macsec header
928 * authenticated, encrypted payload
929 */
930 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
931
932 aead_request_set_crypt(req, sg, sg, len, iv);
933 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
934 skb = skb_unshare(skb, GFP_ATOMIC);
935 if (!skb) {
936 aead_request_free(req);
937 return ERR_PTR(-ENOMEM);
938 }
939 } else {
940 /* integrity only: all headers + data authenticated */
941 aead_request_set_crypt(req, sg, sg, icv_len, iv);
942 aead_request_set_ad(req, skb->len - icv_len);
943 }
944
945 macsec_skb_cb(skb)->req = req;
946 skb->dev = dev;
947 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
948
949 dev_hold(dev);
950 ret = crypto_aead_decrypt(req);
951 if (ret == -EINPROGRESS) {
952 return ERR_PTR(ret);
953 } else if (ret != 0) {
954 /* decryption/authentication failed
955 * 10.6 if validateFrames is disabled, deliver anyway
956 */
957 if (ret != -EBADMSG) {
958 kfree_skb(skb);
959 skb = ERR_PTR(ret);
960 }
961 } else {
962 macsec_skb_cb(skb)->valid = true;
963 }
964 dev_put(dev);
965
966 aead_request_free(req);
967
968 return skb;
969}
970
971static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
972{
973 struct macsec_rx_sc *rx_sc;
974
975 for_each_rxsc(secy, rx_sc) {
976 if (rx_sc->sci == sci)
977 return rx_sc;
978 }
979
980 return NULL;
981}
982
983static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
984{
985 struct macsec_rx_sc *rx_sc;
986
987 for_each_rxsc_rtnl(secy, rx_sc) {
988 if (rx_sc->sci == sci)
989 return rx_sc;
990 }
991
992 return NULL;
993}
994
995static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
996{
997 /* Deliver to the uncontrolled port by default */
998 enum rx_handler_result ret = RX_HANDLER_PASS;
999 struct ethhdr *hdr = eth_hdr(skb);
1000 struct macsec_rxh_data *rxd;
1001 struct macsec_dev *macsec;
1002
1003 rcu_read_lock();
1004 rxd = macsec_data_rcu(skb->dev);
1005
1006 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1007 struct sk_buff *nskb;
1008 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1009 struct net_device *ndev = macsec->secy.netdev;
1010
1011 /* If h/w offloading is enabled, HW decodes frames and strips
1012 * the SecTAG, so we have to deduce which port to deliver to.
1013 */
1014 if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
1015 if (ether_addr_equal_64bits(hdr->h_dest,
1016 ndev->dev_addr)) {
1017 /* exact match, divert skb to this port */
1018 skb->dev = ndev;
1019 skb->pkt_type = PACKET_HOST;
1020 ret = RX_HANDLER_ANOTHER;
1021 goto out;
1022 } else if (is_multicast_ether_addr_64bits(
1023 hdr->h_dest)) {
1024 /* multicast frame, deliver on this port too */
1025 nskb = skb_clone(skb, GFP_ATOMIC);
1026 if (!nskb)
1027 break;
1028
1029 nskb->dev = ndev;
1030 if (ether_addr_equal_64bits(hdr->h_dest,
1031 ndev->broadcast))
1032 nskb->pkt_type = PACKET_BROADCAST;
1033 else
1034 nskb->pkt_type = PACKET_MULTICAST;
1035
1036 netif_rx(nskb);
1037 }
1038 continue;
1039 }
1040
1041 /* 10.6 If the management control validateFrames is not
1042 * Strict, frames without a SecTAG are received, counted, and
1043 * delivered to the Controlled Port
1044 */
1045 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1046 u64_stats_update_begin(&secy_stats->syncp);
1047 secy_stats->stats.InPktsNoTag++;
1048 u64_stats_update_end(&secy_stats->syncp);
1049 continue;
1050 }
1051
1052 /* deliver on this port */
1053 nskb = skb_clone(skb, GFP_ATOMIC);
1054 if (!nskb)
1055 break;
1056
1057 nskb->dev = ndev;
1058
1059 if (netif_rx(nskb) == NET_RX_SUCCESS) {
1060 u64_stats_update_begin(&secy_stats->syncp);
1061 secy_stats->stats.InPktsUntagged++;
1062 u64_stats_update_end(&secy_stats->syncp);
1063 }
1064 }
1065
1066out:
1067 rcu_read_unlock();
1068 return ret;
1069}
1070
1071static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1072{
1073 struct sk_buff *skb = *pskb;
1074 struct net_device *dev = skb->dev;
1075 struct macsec_eth_header *hdr;
1076 struct macsec_secy *secy = NULL;
1077 struct macsec_rx_sc *rx_sc;
1078 struct macsec_rx_sa *rx_sa;
1079 struct macsec_rxh_data *rxd;
1080 struct macsec_dev *macsec;
1081 unsigned int len;
1082 sci_t sci;
1083 u32 hdr_pn;
1084 bool cbit;
1085 struct pcpu_rx_sc_stats *rxsc_stats;
1086 struct pcpu_secy_stats *secy_stats;
1087 bool pulled_sci;
1088 int ret;
1089
1090 if (skb_headroom(skb) < ETH_HLEN)
1091 goto drop_direct;
1092
1093 hdr = macsec_ethhdr(skb);
1094 if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
1095 return handle_not_macsec(skb);
1096
1097 skb = skb_unshare(skb, GFP_ATOMIC);
1098 *pskb = skb;
1099 if (!skb)
1100 return RX_HANDLER_CONSUMED;
1101
1102 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1103 if (!pulled_sci) {
1104 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1105 goto drop_direct;
1106 }
1107
1108 hdr = macsec_ethhdr(skb);
1109
1110 /* Frames with a SecTAG that has the TCI E bit set but the C
1111 * bit clear are discarded, as this reserved encoding is used
1112 * to identify frames with a SecTAG that are not to be
1113 * delivered to the Controlled Port.
1114 */
1115 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1116 return RX_HANDLER_PASS;
1117
1118 /* now, pull the extra length */
1119 if (hdr->tci_an & MACSEC_TCI_SC) {
1120 if (!pulled_sci)
1121 goto drop_direct;
1122 }
1123
1124 /* ethernet header is part of crypto processing */
1125 skb_push(skb, ETH_HLEN);
1126
1127 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1128 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1129 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1130
1131 rcu_read_lock();
1132 rxd = macsec_data_rcu(skb->dev);
1133
1134 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1135 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1136
1137 sc = sc ? macsec_rxsc_get(sc) : NULL;
1138
1139 if (sc) {
1140 secy = &macsec->secy;
1141 rx_sc = sc;
1142 break;
1143 }
1144 }
1145
1146 if (!secy)
1147 goto nosci;
1148
1149 dev = secy->netdev;
1150 macsec = macsec_priv(dev);
1151 secy_stats = this_cpu_ptr(macsec->stats);
1152 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1153
1154 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
1155 u64_stats_update_begin(&secy_stats->syncp);
1156 secy_stats->stats.InPktsBadTag++;
1157 u64_stats_update_end(&secy_stats->syncp);
1158 goto drop_nosa;
1159 }
1160
1161 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1162 if (!rx_sa) {
1163 /* 10.6.1 if the SA is not in use */
1164
1165 /* If validateFrames is Strict or the C bit in the
1166 * SecTAG is set, discard
1167 */
1168 if (hdr->tci_an & MACSEC_TCI_C ||
1169 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1170 u64_stats_update_begin(&rxsc_stats->syncp);
1171 rxsc_stats->stats.InPktsNotUsingSA++;
1172 u64_stats_update_end(&rxsc_stats->syncp);
1173 goto drop_nosa;
1174 }
1175
1176 /* not Strict, the frame (with the SecTAG and ICV
1177 * removed) is delivered to the Controlled Port.
1178 */
1179 u64_stats_update_begin(&rxsc_stats->syncp);
1180 rxsc_stats->stats.InPktsUnusedSA++;
1181 u64_stats_update_end(&rxsc_stats->syncp);
1182 goto deliver;
1183 }
1184
1185 /* First, PN check to avoid decrypting obviously wrong packets */
1186 hdr_pn = ntohl(hdr->packet_number);
1187 if (secy->replay_protect) {
1188 bool late;
1189
1190 spin_lock(&rx_sa->lock);
1191 late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
1192 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
1193
1194 if (secy->xpn)
1195 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
1196 spin_unlock(&rx_sa->lock);
1197
1198 if (late) {
1199 u64_stats_update_begin(&rxsc_stats->syncp);
1200 rxsc_stats->stats.InPktsLate++;
1201 u64_stats_update_end(&rxsc_stats->syncp);
1202 goto drop;
1203 }
1204 }
1205
1206 macsec_skb_cb(skb)->rx_sa = rx_sa;
1207
1208 /* Disabled && !changed text => skip validation */
1209 if (hdr->tci_an & MACSEC_TCI_C ||
1210 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1211 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1212
1213 if (IS_ERR(skb)) {
1214 /* the decrypt callback needs the reference */
1215 if (PTR_ERR(skb) != -EINPROGRESS) {
1216 macsec_rxsa_put(rx_sa);
1217 macsec_rxsc_put(rx_sc);
1218 }
1219 rcu_read_unlock();
1220 *pskb = NULL;
1221 return RX_HANDLER_CONSUMED;
1222 }
1223
1224 if (!macsec_post_decrypt(skb, secy, hdr_pn))
1225 goto drop;
1226
1227deliver:
1228 macsec_finalize_skb(skb, secy->icv_len,
1229 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1230 macsec_reset_skb(skb, secy->netdev);
1231
1232 if (rx_sa)
1233 macsec_rxsa_put(rx_sa);
1234 macsec_rxsc_put(rx_sc);
1235
1236 skb_orphan(skb);
1237 len = skb->len;
1238 ret = gro_cells_receive(&macsec->gro_cells, skb);
1239 if (ret == NET_RX_SUCCESS)
1240 count_rx(dev, len);
1241 else
1242 macsec->secy.netdev->stats.rx_dropped++;
1243
1244 rcu_read_unlock();
1245
1246 *pskb = NULL;
1247 return RX_HANDLER_CONSUMED;
1248
1249drop:
1250 macsec_rxsa_put(rx_sa);
1251drop_nosa:
1252 macsec_rxsc_put(rx_sc);
1253 rcu_read_unlock();
1254drop_direct:
1255 kfree_skb(skb);
1256 *pskb = NULL;
1257 return RX_HANDLER_CONSUMED;
1258
1259nosci:
1260 /* 10.6.1 if the SC is not found */
1261 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1262 if (!cbit)
1263 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1264 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1265
1266 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1267 struct sk_buff *nskb;
1268
1269 secy_stats = this_cpu_ptr(macsec->stats);
1270
1271 /* If validateFrames is Strict or the C bit in the
1272 * SecTAG is set, discard
1273 */
1274 if (cbit ||
1275 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1276 u64_stats_update_begin(&secy_stats->syncp);
1277 secy_stats->stats.InPktsNoSCI++;
1278 u64_stats_update_end(&secy_stats->syncp);
1279 continue;
1280 }
1281
1282 /* not strict, the frame (with the SecTAG and ICV
1283 * removed) is delivered to the Controlled Port.
1284 */
1285 nskb = skb_clone(skb, GFP_ATOMIC);
1286 if (!nskb)
1287 break;
1288
1289 macsec_reset_skb(nskb, macsec->secy.netdev);
1290
1291 ret = netif_rx(nskb);
1292 if (ret == NET_RX_SUCCESS) {
1293 u64_stats_update_begin(&secy_stats->syncp);
1294 secy_stats->stats.InPktsUnknownSCI++;
1295 u64_stats_update_end(&secy_stats->syncp);
1296 } else {
1297 macsec->secy.netdev->stats.rx_dropped++;
1298 }
1299 }
1300
1301 rcu_read_unlock();
1302 *pskb = skb;
1303 return RX_HANDLER_PASS;
1304}
1305
1306static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1307{
1308 struct crypto_aead *tfm;
1309 int ret;
1310
1311 /* Pick a sync gcm(aes) cipher to ensure order is preserved. */
1312 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
1313
1314 if (IS_ERR(tfm))
1315 return tfm;
1316
1317 ret = crypto_aead_setkey(tfm, key, key_len);
1318 if (ret < 0)
1319 goto fail;
1320
1321 ret = crypto_aead_setauthsize(tfm, icv_len);
1322 if (ret < 0)
1323 goto fail;
1324
1325 return tfm;
1326fail:
1327 crypto_free_aead(tfm);
1328 return ERR_PTR(ret);
1329}
1330
1331static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1332 int icv_len)
1333{
1334 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1335 if (!rx_sa->stats)
1336 return -ENOMEM;
1337
1338 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1339 if (IS_ERR(rx_sa->key.tfm)) {
1340 free_percpu(rx_sa->stats);
1341 return PTR_ERR(rx_sa->key.tfm);
1342 }
1343
1344 rx_sa->ssci = MACSEC_UNDEF_SSCI;
1345 rx_sa->active = false;
1346 rx_sa->next_pn = 1;
1347 refcount_set(&rx_sa->refcnt, 1);
1348 spin_lock_init(&rx_sa->lock);
1349
1350 return 0;
1351}
1352
1353static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1354{
1355 rx_sa->active = false;
1356
1357 macsec_rxsa_put(rx_sa);
1358}
1359
1360static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1361{
1362 int i;
1363
1364 for (i = 0; i < MACSEC_NUM_AN; i++) {
1365 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1366
1367 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1368 if (sa)
1369 clear_rx_sa(sa);
1370 }
1371
1372 macsec_rxsc_put(rx_sc);
1373}
1374
1375static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1376{
1377 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1378
1379 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1380 rx_sc;
1381 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1382 if (rx_sc->sci == sci) {
1383 if (rx_sc->active)
1384 secy->n_rx_sc--;
1385 rcu_assign_pointer(*rx_scp, rx_sc->next);
1386 return rx_sc;
1387 }
1388 }
1389
1390 return NULL;
1391}
1392
1393static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1394{
1395 struct macsec_rx_sc *rx_sc;
1396 struct macsec_dev *macsec;
1397 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1398 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1399 struct macsec_secy *secy;
1400
1401 list_for_each_entry(macsec, &rxd->secys, secys) {
1402 if (find_rx_sc_rtnl(&macsec->secy, sci))
1403 return ERR_PTR(-EEXIST);
1404 }
1405
1406 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1407 if (!rx_sc)
1408 return ERR_PTR(-ENOMEM);
1409
1410 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1411 if (!rx_sc->stats) {
1412 kfree(rx_sc);
1413 return ERR_PTR(-ENOMEM);
1414 }
1415
1416 rx_sc->sci = sci;
1417 rx_sc->active = true;
1418 refcount_set(&rx_sc->refcnt, 1);
1419
1420 secy = &macsec_priv(dev)->secy;
1421 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1422 rcu_assign_pointer(secy->rx_sc, rx_sc);
1423
1424 if (rx_sc->active)
1425 secy->n_rx_sc++;
1426
1427 return rx_sc;
1428}
1429
1430static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1431 int icv_len)
1432{
1433 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1434 if (!tx_sa->stats)
1435 return -ENOMEM;
1436
1437 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1438 if (IS_ERR(tx_sa->key.tfm)) {
1439 free_percpu(tx_sa->stats);
1440 return PTR_ERR(tx_sa->key.tfm);
1441 }
1442
1443 tx_sa->ssci = MACSEC_UNDEF_SSCI;
1444 tx_sa->active = false;
1445 refcount_set(&tx_sa->refcnt, 1);
1446 spin_lock_init(&tx_sa->lock);
1447
1448 return 0;
1449}
1450
1451static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1452{
1453 tx_sa->active = false;
1454
1455 macsec_txsa_put(tx_sa);
1456}
1457
1458static struct genl_family macsec_fam;
1459
1460static struct net_device *get_dev_from_nl(struct net *net,
1461 struct nlattr **attrs)
1462{
1463 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1464 struct net_device *dev;
1465
1466 dev = __dev_get_by_index(net, ifindex);
1467 if (!dev)
1468 return ERR_PTR(-ENODEV);
1469
1470 if (!netif_is_macsec(dev))
1471 return ERR_PTR(-ENODEV);
1472
1473 return dev;
1474}
1475
1476static enum macsec_offload nla_get_offload(const struct nlattr *nla)
1477{
1478 return (__force enum macsec_offload)nla_get_u8(nla);
1479}
1480
1481static sci_t nla_get_sci(const struct nlattr *nla)
1482{
1483 return (__force sci_t)nla_get_u64(nla);
1484}
1485
1486static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1487 int padattr)
1488{
1489 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1490}
1491
1492static ssci_t nla_get_ssci(const struct nlattr *nla)
1493{
1494 return (__force ssci_t)nla_get_u32(nla);
1495}
1496
1497static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
1498{
1499 return nla_put_u32(skb, attrtype, (__force u64)value);
1500}
1501
1502static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1503 struct nlattr **attrs,
1504 struct nlattr **tb_sa,
1505 struct net_device **devp,
1506 struct macsec_secy **secyp,
1507 struct macsec_tx_sc **scp,
1508 u8 *assoc_num)
1509{
1510 struct net_device *dev;
1511 struct macsec_secy *secy;
1512 struct macsec_tx_sc *tx_sc;
1513 struct macsec_tx_sa *tx_sa;
1514
1515 if (!tb_sa[MACSEC_SA_ATTR_AN])
1516 return ERR_PTR(-EINVAL);
1517
1518 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1519
1520 dev = get_dev_from_nl(net, attrs);
1521 if (IS_ERR(dev))
1522 return ERR_CAST(dev);
1523
1524 if (*assoc_num >= MACSEC_NUM_AN)
1525 return ERR_PTR(-EINVAL);
1526
1527 secy = &macsec_priv(dev)->secy;
1528 tx_sc = &secy->tx_sc;
1529
1530 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1531 if (!tx_sa)
1532 return ERR_PTR(-ENODEV);
1533
1534 *devp = dev;
1535 *scp = tx_sc;
1536 *secyp = secy;
1537 return tx_sa;
1538}
1539
1540static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1541 struct nlattr **attrs,
1542 struct nlattr **tb_rxsc,
1543 struct net_device **devp,
1544 struct macsec_secy **secyp)
1545{
1546 struct net_device *dev;
1547 struct macsec_secy *secy;
1548 struct macsec_rx_sc *rx_sc;
1549 sci_t sci;
1550
1551 dev = get_dev_from_nl(net, attrs);
1552 if (IS_ERR(dev))
1553 return ERR_CAST(dev);
1554
1555 secy = &macsec_priv(dev)->secy;
1556
1557 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1558 return ERR_PTR(-EINVAL);
1559
1560 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1561 rx_sc = find_rx_sc_rtnl(secy, sci);
1562 if (!rx_sc)
1563 return ERR_PTR(-ENODEV);
1564
1565 *secyp = secy;
1566 *devp = dev;
1567
1568 return rx_sc;
1569}
1570
1571static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1572 struct nlattr **attrs,
1573 struct nlattr **tb_rxsc,
1574 struct nlattr **tb_sa,
1575 struct net_device **devp,
1576 struct macsec_secy **secyp,
1577 struct macsec_rx_sc **scp,
1578 u8 *assoc_num)
1579{
1580 struct macsec_rx_sc *rx_sc;
1581 struct macsec_rx_sa *rx_sa;
1582
1583 if (!tb_sa[MACSEC_SA_ATTR_AN])
1584 return ERR_PTR(-EINVAL);
1585
1586 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1587 if (*assoc_num >= MACSEC_NUM_AN)
1588 return ERR_PTR(-EINVAL);
1589
1590 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1591 if (IS_ERR(rx_sc))
1592 return ERR_CAST(rx_sc);
1593
1594 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1595 if (!rx_sa)
1596 return ERR_PTR(-ENODEV);
1597
1598 *scp = rx_sc;
1599 return rx_sa;
1600}
1601
1602static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1603 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1604 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1605 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1606 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1607};
1608
1609static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1610 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1611 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1612};
1613
1614static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1615 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1616 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1617 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4),
1618 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1619 .len = MACSEC_KEYID_LEN, },
1620 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1621 .len = MACSEC_MAX_KEY_LEN, },
1622 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
1623 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
1624 .len = MACSEC_SALT_LEN, },
1625};
1626
1627static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
1628 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
1629};
1630
1631/* Offloads an operation to a device driver */
1632static int macsec_offload(int (* const func)(struct macsec_context *),
1633 struct macsec_context *ctx)
1634{
1635 int ret;
1636
1637 if (unlikely(!func))
1638 return 0;
1639
1640 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1641 mutex_lock(&ctx->phydev->lock);
1642
1643 /* Phase I: prepare. The drive should fail here if there are going to be
1644 * issues in the commit phase.
1645 */
1646 ctx->prepare = true;
1647 ret = (*func)(ctx);
1648 if (ret)
1649 goto phy_unlock;
1650
1651 /* Phase II: commit. This step cannot fail. */
1652 ctx->prepare = false;
1653 ret = (*func)(ctx);
1654 /* This should never happen: commit is not allowed to fail */
1655 if (unlikely(ret))
1656 WARN(1, "MACsec offloading commit failed (%d)\n", ret);
1657
1658phy_unlock:
1659 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1660 mutex_unlock(&ctx->phydev->lock);
1661
1662 return ret;
1663}
1664
1665static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1666{
1667 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1668 return -EINVAL;
1669
1670 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1671 return -EINVAL;
1672
1673 return 0;
1674}
1675
1676static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1677{
1678 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1679 return -EINVAL;
1680
1681 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1682 return -EINVAL;
1683
1684 return 0;
1685}
1686
1687static bool validate_add_rxsa(struct nlattr **attrs)
1688{
1689 if (!attrs[MACSEC_SA_ATTR_AN] ||
1690 !attrs[MACSEC_SA_ATTR_KEY] ||
1691 !attrs[MACSEC_SA_ATTR_KEYID])
1692 return false;
1693
1694 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1695 return false;
1696
1697 if (attrs[MACSEC_SA_ATTR_PN] &&
1698 *(u64 *)nla_data(attrs[MACSEC_SA_ATTR_PN]) == 0)
1699 return false;
1700
1701 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1702 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1703 return false;
1704 }
1705
1706 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1707 return false;
1708
1709 return true;
1710}
1711
1712static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1713{
1714 struct net_device *dev;
1715 struct nlattr **attrs = info->attrs;
1716 struct macsec_secy *secy;
1717 struct macsec_rx_sc *rx_sc;
1718 struct macsec_rx_sa *rx_sa;
1719 unsigned char assoc_num;
1720 int pn_len;
1721 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1722 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1723 int err;
1724
1725 if (!attrs[MACSEC_ATTR_IFINDEX])
1726 return -EINVAL;
1727
1728 if (parse_sa_config(attrs, tb_sa))
1729 return -EINVAL;
1730
1731 if (parse_rxsc_config(attrs, tb_rxsc))
1732 return -EINVAL;
1733
1734 if (!validate_add_rxsa(tb_sa))
1735 return -EINVAL;
1736
1737 rtnl_lock();
1738 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1739 if (IS_ERR(rx_sc)) {
1740 rtnl_unlock();
1741 return PTR_ERR(rx_sc);
1742 }
1743
1744 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1745
1746 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1747 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1748 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1749 rtnl_unlock();
1750 return -EINVAL;
1751 }
1752
1753 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1754 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1755 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
1756 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1757 rtnl_unlock();
1758 return -EINVAL;
1759 }
1760
1761 if (secy->xpn) {
1762 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
1763 rtnl_unlock();
1764 return -EINVAL;
1765 }
1766
1767 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
1768 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
1769 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
1770 MACSEC_SA_ATTR_SALT);
1771 rtnl_unlock();
1772 return -EINVAL;
1773 }
1774 }
1775
1776 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1777 if (rx_sa) {
1778 rtnl_unlock();
1779 return -EBUSY;
1780 }
1781
1782 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1783 if (!rx_sa) {
1784 rtnl_unlock();
1785 return -ENOMEM;
1786 }
1787
1788 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1789 secy->key_len, secy->icv_len);
1790 if (err < 0) {
1791 kfree(rx_sa);
1792 rtnl_unlock();
1793 return err;
1794 }
1795
1796 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1797 spin_lock_bh(&rx_sa->lock);
1798 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
1799 spin_unlock_bh(&rx_sa->lock);
1800 }
1801
1802 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1803 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1804
1805 rx_sa->sc = rx_sc;
1806
1807 /* If h/w offloading is available, propagate to the device */
1808 if (macsec_is_offloaded(netdev_priv(dev))) {
1809 const struct macsec_ops *ops;
1810 struct macsec_context ctx;
1811
1812 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1813 if (!ops) {
1814 err = -EOPNOTSUPP;
1815 goto cleanup;
1816 }
1817
1818 ctx.sa.assoc_num = assoc_num;
1819 ctx.sa.rx_sa = rx_sa;
1820 ctx.secy = secy;
1821 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1822 secy->key_len);
1823
1824 err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1825 if (err)
1826 goto cleanup;
1827 }
1828
1829 if (secy->xpn) {
1830 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
1831 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
1832 MACSEC_SALT_LEN);
1833 }
1834
1835 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1836 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1837
1838 rtnl_unlock();
1839
1840 return 0;
1841
1842cleanup:
1843 kfree(rx_sa);
1844 rtnl_unlock();
1845 return err;
1846}
1847
1848static bool validate_add_rxsc(struct nlattr **attrs)
1849{
1850 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1851 return false;
1852
1853 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1854 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1855 return false;
1856 }
1857
1858 return true;
1859}
1860
1861static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1862{
1863 struct net_device *dev;
1864 sci_t sci = MACSEC_UNDEF_SCI;
1865 struct nlattr **attrs = info->attrs;
1866 struct macsec_rx_sc *rx_sc;
1867 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1868 struct macsec_secy *secy;
1869 bool was_active;
1870 int ret;
1871
1872 if (!attrs[MACSEC_ATTR_IFINDEX])
1873 return -EINVAL;
1874
1875 if (parse_rxsc_config(attrs, tb_rxsc))
1876 return -EINVAL;
1877
1878 if (!validate_add_rxsc(tb_rxsc))
1879 return -EINVAL;
1880
1881 rtnl_lock();
1882 dev = get_dev_from_nl(genl_info_net(info), attrs);
1883 if (IS_ERR(dev)) {
1884 rtnl_unlock();
1885 return PTR_ERR(dev);
1886 }
1887
1888 secy = &macsec_priv(dev)->secy;
1889 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1890
1891 rx_sc = create_rx_sc(dev, sci);
1892 if (IS_ERR(rx_sc)) {
1893 rtnl_unlock();
1894 return PTR_ERR(rx_sc);
1895 }
1896
1897 was_active = rx_sc->active;
1898 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1899 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1900
1901 if (macsec_is_offloaded(netdev_priv(dev))) {
1902 const struct macsec_ops *ops;
1903 struct macsec_context ctx;
1904
1905 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1906 if (!ops) {
1907 ret = -EOPNOTSUPP;
1908 goto cleanup;
1909 }
1910
1911 ctx.rx_sc = rx_sc;
1912 ctx.secy = secy;
1913
1914 ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1915 if (ret)
1916 goto cleanup;
1917 }
1918
1919 rtnl_unlock();
1920
1921 return 0;
1922
1923cleanup:
1924 rx_sc->active = was_active;
1925 rtnl_unlock();
1926 return ret;
1927}
1928
1929static bool validate_add_txsa(struct nlattr **attrs)
1930{
1931 if (!attrs[MACSEC_SA_ATTR_AN] ||
1932 !attrs[MACSEC_SA_ATTR_PN] ||
1933 !attrs[MACSEC_SA_ATTR_KEY] ||
1934 !attrs[MACSEC_SA_ATTR_KEYID])
1935 return false;
1936
1937 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1938 return false;
1939
1940 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1941 return false;
1942
1943 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1944 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1945 return false;
1946 }
1947
1948 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1949 return false;
1950
1951 return true;
1952}
1953
1954static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1955{
1956 struct net_device *dev;
1957 struct nlattr **attrs = info->attrs;
1958 struct macsec_secy *secy;
1959 struct macsec_tx_sc *tx_sc;
1960 struct macsec_tx_sa *tx_sa;
1961 unsigned char assoc_num;
1962 int pn_len;
1963 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1964 bool was_operational;
1965 int err;
1966
1967 if (!attrs[MACSEC_ATTR_IFINDEX])
1968 return -EINVAL;
1969
1970 if (parse_sa_config(attrs, tb_sa))
1971 return -EINVAL;
1972
1973 if (!validate_add_txsa(tb_sa))
1974 return -EINVAL;
1975
1976 rtnl_lock();
1977 dev = get_dev_from_nl(genl_info_net(info), attrs);
1978 if (IS_ERR(dev)) {
1979 rtnl_unlock();
1980 return PTR_ERR(dev);
1981 }
1982
1983 secy = &macsec_priv(dev)->secy;
1984 tx_sc = &secy->tx_sc;
1985
1986 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1987
1988 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1989 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1990 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1991 rtnl_unlock();
1992 return -EINVAL;
1993 }
1994
1995 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1996 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1997 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
1998 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1999 rtnl_unlock();
2000 return -EINVAL;
2001 }
2002
2003 if (secy->xpn) {
2004 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
2005 rtnl_unlock();
2006 return -EINVAL;
2007 }
2008
2009 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
2010 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
2011 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
2012 MACSEC_SA_ATTR_SALT);
2013 rtnl_unlock();
2014 return -EINVAL;
2015 }
2016 }
2017
2018 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
2019 if (tx_sa) {
2020 rtnl_unlock();
2021 return -EBUSY;
2022 }
2023
2024 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
2025 if (!tx_sa) {
2026 rtnl_unlock();
2027 return -ENOMEM;
2028 }
2029
2030 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2031 secy->key_len, secy->icv_len);
2032 if (err < 0) {
2033 kfree(tx_sa);
2034 rtnl_unlock();
2035 return err;
2036 }
2037
2038 spin_lock_bh(&tx_sa->lock);
2039 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2040 spin_unlock_bh(&tx_sa->lock);
2041
2042 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2043 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2044
2045 was_operational = secy->operational;
2046 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
2047 secy->operational = true;
2048
2049 /* If h/w offloading is available, propagate to the device */
2050 if (macsec_is_offloaded(netdev_priv(dev))) {
2051 const struct macsec_ops *ops;
2052 struct macsec_context ctx;
2053
2054 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2055 if (!ops) {
2056 err = -EOPNOTSUPP;
2057 goto cleanup;
2058 }
2059
2060 ctx.sa.assoc_num = assoc_num;
2061 ctx.sa.tx_sa = tx_sa;
2062 ctx.secy = secy;
2063 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2064 secy->key_len);
2065
2066 err = macsec_offload(ops->mdo_add_txsa, &ctx);
2067 if (err)
2068 goto cleanup;
2069 }
2070
2071 if (secy->xpn) {
2072 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
2073 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
2074 MACSEC_SALT_LEN);
2075 }
2076
2077 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
2078 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
2079
2080 rtnl_unlock();
2081
2082 return 0;
2083
2084cleanup:
2085 secy->operational = was_operational;
2086 kfree(tx_sa);
2087 rtnl_unlock();
2088 return err;
2089}
2090
2091static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
2092{
2093 struct nlattr **attrs = info->attrs;
2094 struct net_device *dev;
2095 struct macsec_secy *secy;
2096 struct macsec_rx_sc *rx_sc;
2097 struct macsec_rx_sa *rx_sa;
2098 u8 assoc_num;
2099 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2100 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2101 int ret;
2102
2103 if (!attrs[MACSEC_ATTR_IFINDEX])
2104 return -EINVAL;
2105
2106 if (parse_sa_config(attrs, tb_sa))
2107 return -EINVAL;
2108
2109 if (parse_rxsc_config(attrs, tb_rxsc))
2110 return -EINVAL;
2111
2112 rtnl_lock();
2113 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2114 &dev, &secy, &rx_sc, &assoc_num);
2115 if (IS_ERR(rx_sa)) {
2116 rtnl_unlock();
2117 return PTR_ERR(rx_sa);
2118 }
2119
2120 if (rx_sa->active) {
2121 rtnl_unlock();
2122 return -EBUSY;
2123 }
2124
2125 /* If h/w offloading is available, propagate to the device */
2126 if (macsec_is_offloaded(netdev_priv(dev))) {
2127 const struct macsec_ops *ops;
2128 struct macsec_context ctx;
2129
2130 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2131 if (!ops) {
2132 ret = -EOPNOTSUPP;
2133 goto cleanup;
2134 }
2135
2136 ctx.sa.assoc_num = assoc_num;
2137 ctx.sa.rx_sa = rx_sa;
2138 ctx.secy = secy;
2139
2140 ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
2141 if (ret)
2142 goto cleanup;
2143 }
2144
2145 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
2146 clear_rx_sa(rx_sa);
2147
2148 rtnl_unlock();
2149
2150 return 0;
2151
2152cleanup:
2153 rtnl_unlock();
2154 return ret;
2155}
2156
2157static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
2158{
2159 struct nlattr **attrs = info->attrs;
2160 struct net_device *dev;
2161 struct macsec_secy *secy;
2162 struct macsec_rx_sc *rx_sc;
2163 sci_t sci;
2164 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2165 int ret;
2166
2167 if (!attrs[MACSEC_ATTR_IFINDEX])
2168 return -EINVAL;
2169
2170 if (parse_rxsc_config(attrs, tb_rxsc))
2171 return -EINVAL;
2172
2173 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
2174 return -EINVAL;
2175
2176 rtnl_lock();
2177 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2178 if (IS_ERR(dev)) {
2179 rtnl_unlock();
2180 return PTR_ERR(dev);
2181 }
2182
2183 secy = &macsec_priv(dev)->secy;
2184 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2185
2186 rx_sc = del_rx_sc(secy, sci);
2187 if (!rx_sc) {
2188 rtnl_unlock();
2189 return -ENODEV;
2190 }
2191
2192 /* If h/w offloading is available, propagate to the device */
2193 if (macsec_is_offloaded(netdev_priv(dev))) {
2194 const struct macsec_ops *ops;
2195 struct macsec_context ctx;
2196
2197 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2198 if (!ops) {
2199 ret = -EOPNOTSUPP;
2200 goto cleanup;
2201 }
2202
2203 ctx.rx_sc = rx_sc;
2204 ctx.secy = secy;
2205 ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2206 if (ret)
2207 goto cleanup;
2208 }
2209
2210 free_rx_sc(rx_sc);
2211 rtnl_unlock();
2212
2213 return 0;
2214
2215cleanup:
2216 rtnl_unlock();
2217 return ret;
2218}
2219
2220static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2221{
2222 struct nlattr **attrs = info->attrs;
2223 struct net_device *dev;
2224 struct macsec_secy *secy;
2225 struct macsec_tx_sc *tx_sc;
2226 struct macsec_tx_sa *tx_sa;
2227 u8 assoc_num;
2228 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2229 int ret;
2230
2231 if (!attrs[MACSEC_ATTR_IFINDEX])
2232 return -EINVAL;
2233
2234 if (parse_sa_config(attrs, tb_sa))
2235 return -EINVAL;
2236
2237 rtnl_lock();
2238 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2239 &dev, &secy, &tx_sc, &assoc_num);
2240 if (IS_ERR(tx_sa)) {
2241 rtnl_unlock();
2242 return PTR_ERR(tx_sa);
2243 }
2244
2245 if (tx_sa->active) {
2246 rtnl_unlock();
2247 return -EBUSY;
2248 }
2249
2250 /* If h/w offloading is available, propagate to the device */
2251 if (macsec_is_offloaded(netdev_priv(dev))) {
2252 const struct macsec_ops *ops;
2253 struct macsec_context ctx;
2254
2255 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2256 if (!ops) {
2257 ret = -EOPNOTSUPP;
2258 goto cleanup;
2259 }
2260
2261 ctx.sa.assoc_num = assoc_num;
2262 ctx.sa.tx_sa = tx_sa;
2263 ctx.secy = secy;
2264
2265 ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2266 if (ret)
2267 goto cleanup;
2268 }
2269
2270 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2271 clear_tx_sa(tx_sa);
2272
2273 rtnl_unlock();
2274
2275 return 0;
2276
2277cleanup:
2278 rtnl_unlock();
2279 return ret;
2280}
2281
2282static bool validate_upd_sa(struct nlattr **attrs)
2283{
2284 if (!attrs[MACSEC_SA_ATTR_AN] ||
2285 attrs[MACSEC_SA_ATTR_KEY] ||
2286 attrs[MACSEC_SA_ATTR_KEYID] ||
2287 attrs[MACSEC_SA_ATTR_SSCI] ||
2288 attrs[MACSEC_SA_ATTR_SALT])
2289 return false;
2290
2291 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2292 return false;
2293
2294 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
2295 return false;
2296
2297 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2298 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2299 return false;
2300 }
2301
2302 return true;
2303}
2304
2305static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2306{
2307 struct nlattr **attrs = info->attrs;
2308 struct net_device *dev;
2309 struct macsec_secy *secy;
2310 struct macsec_tx_sc *tx_sc;
2311 struct macsec_tx_sa *tx_sa;
2312 u8 assoc_num;
2313 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2314 bool was_operational, was_active;
2315 pn_t prev_pn;
2316 int ret = 0;
2317
2318 prev_pn.full64 = 0;
2319
2320 if (!attrs[MACSEC_ATTR_IFINDEX])
2321 return -EINVAL;
2322
2323 if (parse_sa_config(attrs, tb_sa))
2324 return -EINVAL;
2325
2326 if (!validate_upd_sa(tb_sa))
2327 return -EINVAL;
2328
2329 rtnl_lock();
2330 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2331 &dev, &secy, &tx_sc, &assoc_num);
2332 if (IS_ERR(tx_sa)) {
2333 rtnl_unlock();
2334 return PTR_ERR(tx_sa);
2335 }
2336
2337 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2338 int pn_len;
2339
2340 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2341 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2342 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
2343 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2344 rtnl_unlock();
2345 return -EINVAL;
2346 }
2347
2348 spin_lock_bh(&tx_sa->lock);
2349 prev_pn = tx_sa->next_pn_halves;
2350 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2351 spin_unlock_bh(&tx_sa->lock);
2352 }
2353
2354 was_active = tx_sa->active;
2355 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2356 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2357
2358 was_operational = secy->operational;
2359 if (assoc_num == tx_sc->encoding_sa)
2360 secy->operational = tx_sa->active;
2361
2362 /* If h/w offloading is available, propagate to the device */
2363 if (macsec_is_offloaded(netdev_priv(dev))) {
2364 const struct macsec_ops *ops;
2365 struct macsec_context ctx;
2366
2367 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2368 if (!ops) {
2369 ret = -EOPNOTSUPP;
2370 goto cleanup;
2371 }
2372
2373 ctx.sa.assoc_num = assoc_num;
2374 ctx.sa.tx_sa = tx_sa;
2375 ctx.secy = secy;
2376
2377 ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
2378 if (ret)
2379 goto cleanup;
2380 }
2381
2382 rtnl_unlock();
2383
2384 return 0;
2385
2386cleanup:
2387 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2388 spin_lock_bh(&tx_sa->lock);
2389 tx_sa->next_pn_halves = prev_pn;
2390 spin_unlock_bh(&tx_sa->lock);
2391 }
2392 tx_sa->active = was_active;
2393 secy->operational = was_operational;
2394 rtnl_unlock();
2395 return ret;
2396}
2397
2398static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2399{
2400 struct nlattr **attrs = info->attrs;
2401 struct net_device *dev;
2402 struct macsec_secy *secy;
2403 struct macsec_rx_sc *rx_sc;
2404 struct macsec_rx_sa *rx_sa;
2405 u8 assoc_num;
2406 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2407 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2408 bool was_active;
2409 pn_t prev_pn;
2410 int ret = 0;
2411
2412 prev_pn.full64 = 0;
2413
2414 if (!attrs[MACSEC_ATTR_IFINDEX])
2415 return -EINVAL;
2416
2417 if (parse_rxsc_config(attrs, tb_rxsc))
2418 return -EINVAL;
2419
2420 if (parse_sa_config(attrs, tb_sa))
2421 return -EINVAL;
2422
2423 if (!validate_upd_sa(tb_sa))
2424 return -EINVAL;
2425
2426 rtnl_lock();
2427 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2428 &dev, &secy, &rx_sc, &assoc_num);
2429 if (IS_ERR(rx_sa)) {
2430 rtnl_unlock();
2431 return PTR_ERR(rx_sa);
2432 }
2433
2434 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2435 int pn_len;
2436
2437 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2438 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2439 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
2440 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2441 rtnl_unlock();
2442 return -EINVAL;
2443 }
2444
2445 spin_lock_bh(&rx_sa->lock);
2446 prev_pn = rx_sa->next_pn_halves;
2447 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2448 spin_unlock_bh(&rx_sa->lock);
2449 }
2450
2451 was_active = rx_sa->active;
2452 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2453 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2454
2455 /* If h/w offloading is available, propagate to the device */
2456 if (macsec_is_offloaded(netdev_priv(dev))) {
2457 const struct macsec_ops *ops;
2458 struct macsec_context ctx;
2459
2460 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2461 if (!ops) {
2462 ret = -EOPNOTSUPP;
2463 goto cleanup;
2464 }
2465
2466 ctx.sa.assoc_num = assoc_num;
2467 ctx.sa.rx_sa = rx_sa;
2468 ctx.secy = secy;
2469
2470 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2471 if (ret)
2472 goto cleanup;
2473 }
2474
2475 rtnl_unlock();
2476 return 0;
2477
2478cleanup:
2479 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2480 spin_lock_bh(&rx_sa->lock);
2481 rx_sa->next_pn_halves = prev_pn;
2482 spin_unlock_bh(&rx_sa->lock);
2483 }
2484 rx_sa->active = was_active;
2485 rtnl_unlock();
2486 return ret;
2487}
2488
2489static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2490{
2491 struct nlattr **attrs = info->attrs;
2492 struct net_device *dev;
2493 struct macsec_secy *secy;
2494 struct macsec_rx_sc *rx_sc;
2495 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2496 unsigned int prev_n_rx_sc;
2497 bool was_active;
2498 int ret;
2499
2500 if (!attrs[MACSEC_ATTR_IFINDEX])
2501 return -EINVAL;
2502
2503 if (parse_rxsc_config(attrs, tb_rxsc))
2504 return -EINVAL;
2505
2506 if (!validate_add_rxsc(tb_rxsc))
2507 return -EINVAL;
2508
2509 rtnl_lock();
2510 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2511 if (IS_ERR(rx_sc)) {
2512 rtnl_unlock();
2513 return PTR_ERR(rx_sc);
2514 }
2515
2516 was_active = rx_sc->active;
2517 prev_n_rx_sc = secy->n_rx_sc;
2518 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2519 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2520
2521 if (rx_sc->active != new)
2522 secy->n_rx_sc += new ? 1 : -1;
2523
2524 rx_sc->active = new;
2525 }
2526
2527 /* If h/w offloading is available, propagate to the device */
2528 if (macsec_is_offloaded(netdev_priv(dev))) {
2529 const struct macsec_ops *ops;
2530 struct macsec_context ctx;
2531
2532 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2533 if (!ops) {
2534 ret = -EOPNOTSUPP;
2535 goto cleanup;
2536 }
2537
2538 ctx.rx_sc = rx_sc;
2539 ctx.secy = secy;
2540
2541 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2542 if (ret)
2543 goto cleanup;
2544 }
2545
2546 rtnl_unlock();
2547
2548 return 0;
2549
2550cleanup:
2551 secy->n_rx_sc = prev_n_rx_sc;
2552 rx_sc->active = was_active;
2553 rtnl_unlock();
2554 return ret;
2555}
2556
2557static bool macsec_is_configured(struct macsec_dev *macsec)
2558{
2559 struct macsec_secy *secy = &macsec->secy;
2560 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2561 int i;
2562
2563 if (secy->n_rx_sc > 0)
2564 return true;
2565
2566 for (i = 0; i < MACSEC_NUM_AN; i++)
2567 if (tx_sc->sa[i])
2568 return true;
2569
2570 return false;
2571}
2572
2573static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2574{
2575 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2576 enum macsec_offload offload, prev_offload;
2577 int (*func)(struct macsec_context *ctx);
2578 struct nlattr **attrs = info->attrs;
2579 struct net_device *dev;
2580 const struct macsec_ops *ops;
2581 struct macsec_context ctx;
2582 struct macsec_dev *macsec;
2583 int ret;
2584
2585 if (!attrs[MACSEC_ATTR_IFINDEX])
2586 return -EINVAL;
2587
2588 if (!attrs[MACSEC_ATTR_OFFLOAD])
2589 return -EINVAL;
2590
2591 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2592 attrs[MACSEC_ATTR_OFFLOAD],
2593 macsec_genl_offload_policy, NULL))
2594 return -EINVAL;
2595
2596 dev = get_dev_from_nl(genl_info_net(info), attrs);
2597 if (IS_ERR(dev))
2598 return PTR_ERR(dev);
2599 macsec = macsec_priv(dev);
2600
2601 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE])
2602 return -EINVAL;
2603
2604 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2605 if (macsec->offload == offload)
2606 return 0;
2607
2608 /* Check if the offloading mode is supported by the underlying layers */
2609 if (offload != MACSEC_OFFLOAD_OFF &&
2610 !macsec_check_offload(offload, macsec))
2611 return -EOPNOTSUPP;
2612
2613 /* Check if the net device is busy. */
2614 if (netif_running(dev))
2615 return -EBUSY;
2616
2617 rtnl_lock();
2618
2619 prev_offload = macsec->offload;
2620 macsec->offload = offload;
2621
2622 /* Check if the device already has rules configured: we do not support
2623 * rules migration.
2624 */
2625 if (macsec_is_configured(macsec)) {
2626 ret = -EBUSY;
2627 goto rollback;
2628 }
2629
2630 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2631 macsec, &ctx);
2632 if (!ops) {
2633 ret = -EOPNOTSUPP;
2634 goto rollback;
2635 }
2636
2637 if (prev_offload == MACSEC_OFFLOAD_OFF)
2638 func = ops->mdo_add_secy;
2639 else
2640 func = ops->mdo_del_secy;
2641
2642 ctx.secy = &macsec->secy;
2643 ret = macsec_offload(func, &ctx);
2644 if (ret)
2645 goto rollback;
2646
2647 /* Force features update, since they are different for SW MACSec and
2648 * HW offloading cases.
2649 */
2650 netdev_update_features(dev);
2651
2652 rtnl_unlock();
2653 return 0;
2654
2655rollback:
2656 macsec->offload = prev_offload;
2657
2658 rtnl_unlock();
2659 return ret;
2660}
2661
2662static void get_tx_sa_stats(struct net_device *dev, int an,
2663 struct macsec_tx_sa *tx_sa,
2664 struct macsec_tx_sa_stats *sum)
2665{
2666 struct macsec_dev *macsec = macsec_priv(dev);
2667 int cpu;
2668
2669 /* If h/w offloading is available, propagate to the device */
2670 if (macsec_is_offloaded(macsec)) {
2671 const struct macsec_ops *ops;
2672 struct macsec_context ctx;
2673
2674 ops = macsec_get_ops(macsec, &ctx);
2675 if (ops) {
2676 ctx.sa.assoc_num = an;
2677 ctx.sa.tx_sa = tx_sa;
2678 ctx.stats.tx_sa_stats = sum;
2679 ctx.secy = &macsec_priv(dev)->secy;
2680 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
2681 }
2682 return;
2683 }
2684
2685 for_each_possible_cpu(cpu) {
2686 const struct macsec_tx_sa_stats *stats =
2687 per_cpu_ptr(tx_sa->stats, cpu);
2688
2689 sum->OutPktsProtected += stats->OutPktsProtected;
2690 sum->OutPktsEncrypted += stats->OutPktsEncrypted;
2691 }
2692}
2693
2694static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
2695{
2696 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
2697 sum->OutPktsProtected) ||
2698 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2699 sum->OutPktsEncrypted))
2700 return -EMSGSIZE;
2701
2702 return 0;
2703}
2704
2705static void get_rx_sa_stats(struct net_device *dev,
2706 struct macsec_rx_sc *rx_sc, int an,
2707 struct macsec_rx_sa *rx_sa,
2708 struct macsec_rx_sa_stats *sum)
2709{
2710 struct macsec_dev *macsec = macsec_priv(dev);
2711 int cpu;
2712
2713 /* If h/w offloading is available, propagate to the device */
2714 if (macsec_is_offloaded(macsec)) {
2715 const struct macsec_ops *ops;
2716 struct macsec_context ctx;
2717
2718 ops = macsec_get_ops(macsec, &ctx);
2719 if (ops) {
2720 ctx.sa.assoc_num = an;
2721 ctx.sa.rx_sa = rx_sa;
2722 ctx.stats.rx_sa_stats = sum;
2723 ctx.secy = &macsec_priv(dev)->secy;
2724 ctx.rx_sc = rx_sc;
2725 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
2726 }
2727 return;
2728 }
2729
2730 for_each_possible_cpu(cpu) {
2731 const struct macsec_rx_sa_stats *stats =
2732 per_cpu_ptr(rx_sa->stats, cpu);
2733
2734 sum->InPktsOK += stats->InPktsOK;
2735 sum->InPktsInvalid += stats->InPktsInvalid;
2736 sum->InPktsNotValid += stats->InPktsNotValid;
2737 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
2738 sum->InPktsUnusedSA += stats->InPktsUnusedSA;
2739 }
2740}
2741
2742static int copy_rx_sa_stats(struct sk_buff *skb,
2743 struct macsec_rx_sa_stats *sum)
2744{
2745 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
2746 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
2747 sum->InPktsInvalid) ||
2748 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
2749 sum->InPktsNotValid) ||
2750 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2751 sum->InPktsNotUsingSA) ||
2752 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
2753 sum->InPktsUnusedSA))
2754 return -EMSGSIZE;
2755
2756 return 0;
2757}
2758
2759static void get_rx_sc_stats(struct net_device *dev,
2760 struct macsec_rx_sc *rx_sc,
2761 struct macsec_rx_sc_stats *sum)
2762{
2763 struct macsec_dev *macsec = macsec_priv(dev);
2764 int cpu;
2765
2766 /* If h/w offloading is available, propagate to the device */
2767 if (macsec_is_offloaded(macsec)) {
2768 const struct macsec_ops *ops;
2769 struct macsec_context ctx;
2770
2771 ops = macsec_get_ops(macsec, &ctx);
2772 if (ops) {
2773 ctx.stats.rx_sc_stats = sum;
2774 ctx.secy = &macsec_priv(dev)->secy;
2775 ctx.rx_sc = rx_sc;
2776 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
2777 }
2778 return;
2779 }
2780
2781 for_each_possible_cpu(cpu) {
2782 const struct pcpu_rx_sc_stats *stats;
2783 struct macsec_rx_sc_stats tmp;
2784 unsigned int start;
2785
2786 stats = per_cpu_ptr(rx_sc->stats, cpu);
2787 do {
2788 start = u64_stats_fetch_begin_irq(&stats->syncp);
2789 memcpy(&tmp, &stats->stats, sizeof(tmp));
2790 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2791
2792 sum->InOctetsValidated += tmp.InOctetsValidated;
2793 sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
2794 sum->InPktsUnchecked += tmp.InPktsUnchecked;
2795 sum->InPktsDelayed += tmp.InPktsDelayed;
2796 sum->InPktsOK += tmp.InPktsOK;
2797 sum->InPktsInvalid += tmp.InPktsInvalid;
2798 sum->InPktsLate += tmp.InPktsLate;
2799 sum->InPktsNotValid += tmp.InPktsNotValid;
2800 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2801 sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
2802 }
2803}
2804
2805static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
2806{
2807 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2808 sum->InOctetsValidated,
2809 MACSEC_RXSC_STATS_ATTR_PAD) ||
2810 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2811 sum->InOctetsDecrypted,
2812 MACSEC_RXSC_STATS_ATTR_PAD) ||
2813 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2814 sum->InPktsUnchecked,
2815 MACSEC_RXSC_STATS_ATTR_PAD) ||
2816 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2817 sum->InPktsDelayed,
2818 MACSEC_RXSC_STATS_ATTR_PAD) ||
2819 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2820 sum->InPktsOK,
2821 MACSEC_RXSC_STATS_ATTR_PAD) ||
2822 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2823 sum->InPktsInvalid,
2824 MACSEC_RXSC_STATS_ATTR_PAD) ||
2825 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2826 sum->InPktsLate,
2827 MACSEC_RXSC_STATS_ATTR_PAD) ||
2828 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2829 sum->InPktsNotValid,
2830 MACSEC_RXSC_STATS_ATTR_PAD) ||
2831 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2832 sum->InPktsNotUsingSA,
2833 MACSEC_RXSC_STATS_ATTR_PAD) ||
2834 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2835 sum->InPktsUnusedSA,
2836 MACSEC_RXSC_STATS_ATTR_PAD))
2837 return -EMSGSIZE;
2838
2839 return 0;
2840}
2841
2842static void get_tx_sc_stats(struct net_device *dev,
2843 struct macsec_tx_sc_stats *sum)
2844{
2845 struct macsec_dev *macsec = macsec_priv(dev);
2846 int cpu;
2847
2848 /* If h/w offloading is available, propagate to the device */
2849 if (macsec_is_offloaded(macsec)) {
2850 const struct macsec_ops *ops;
2851 struct macsec_context ctx;
2852
2853 ops = macsec_get_ops(macsec, &ctx);
2854 if (ops) {
2855 ctx.stats.tx_sc_stats = sum;
2856 ctx.secy = &macsec_priv(dev)->secy;
2857 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
2858 }
2859 return;
2860 }
2861
2862 for_each_possible_cpu(cpu) {
2863 const struct pcpu_tx_sc_stats *stats;
2864 struct macsec_tx_sc_stats tmp;
2865 unsigned int start;
2866
2867 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
2868 do {
2869 start = u64_stats_fetch_begin_irq(&stats->syncp);
2870 memcpy(&tmp, &stats->stats, sizeof(tmp));
2871 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2872
2873 sum->OutPktsProtected += tmp.OutPktsProtected;
2874 sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
2875 sum->OutOctetsProtected += tmp.OutOctetsProtected;
2876 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2877 }
2878}
2879
2880static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
2881{
2882 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2883 sum->OutPktsProtected,
2884 MACSEC_TXSC_STATS_ATTR_PAD) ||
2885 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2886 sum->OutPktsEncrypted,
2887 MACSEC_TXSC_STATS_ATTR_PAD) ||
2888 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2889 sum->OutOctetsProtected,
2890 MACSEC_TXSC_STATS_ATTR_PAD) ||
2891 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2892 sum->OutOctetsEncrypted,
2893 MACSEC_TXSC_STATS_ATTR_PAD))
2894 return -EMSGSIZE;
2895
2896 return 0;
2897}
2898
2899static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
2900{
2901 struct macsec_dev *macsec = macsec_priv(dev);
2902 int cpu;
2903
2904 /* If h/w offloading is available, propagate to the device */
2905 if (macsec_is_offloaded(macsec)) {
2906 const struct macsec_ops *ops;
2907 struct macsec_context ctx;
2908
2909 ops = macsec_get_ops(macsec, &ctx);
2910 if (ops) {
2911 ctx.stats.dev_stats = sum;
2912 ctx.secy = &macsec_priv(dev)->secy;
2913 macsec_offload(ops->mdo_get_dev_stats, &ctx);
2914 }
2915 return;
2916 }
2917
2918 for_each_possible_cpu(cpu) {
2919 const struct pcpu_secy_stats *stats;
2920 struct macsec_dev_stats tmp;
2921 unsigned int start;
2922
2923 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
2924 do {
2925 start = u64_stats_fetch_begin_irq(&stats->syncp);
2926 memcpy(&tmp, &stats->stats, sizeof(tmp));
2927 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2928
2929 sum->OutPktsUntagged += tmp.OutPktsUntagged;
2930 sum->InPktsUntagged += tmp.InPktsUntagged;
2931 sum->OutPktsTooLong += tmp.OutPktsTooLong;
2932 sum->InPktsNoTag += tmp.InPktsNoTag;
2933 sum->InPktsBadTag += tmp.InPktsBadTag;
2934 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2935 sum->InPktsNoSCI += tmp.InPktsNoSCI;
2936 sum->InPktsOverrun += tmp.InPktsOverrun;
2937 }
2938}
2939
2940static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
2941{
2942 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2943 sum->OutPktsUntagged,
2944 MACSEC_SECY_STATS_ATTR_PAD) ||
2945 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2946 sum->InPktsUntagged,
2947 MACSEC_SECY_STATS_ATTR_PAD) ||
2948 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2949 sum->OutPktsTooLong,
2950 MACSEC_SECY_STATS_ATTR_PAD) ||
2951 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2952 sum->InPktsNoTag,
2953 MACSEC_SECY_STATS_ATTR_PAD) ||
2954 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2955 sum->InPktsBadTag,
2956 MACSEC_SECY_STATS_ATTR_PAD) ||
2957 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2958 sum->InPktsUnknownSCI,
2959 MACSEC_SECY_STATS_ATTR_PAD) ||
2960 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2961 sum->InPktsNoSCI,
2962 MACSEC_SECY_STATS_ATTR_PAD) ||
2963 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2964 sum->InPktsOverrun,
2965 MACSEC_SECY_STATS_ATTR_PAD))
2966 return -EMSGSIZE;
2967
2968 return 0;
2969}
2970
2971static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2972{
2973 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2974 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
2975 MACSEC_ATTR_SECY);
2976 u64 csid;
2977
2978 if (!secy_nest)
2979 return 1;
2980
2981 switch (secy->key_len) {
2982 case MACSEC_GCM_AES_128_SAK_LEN:
2983 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
2984 break;
2985 case MACSEC_GCM_AES_256_SAK_LEN:
2986 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
2987 break;
2988 default:
2989 goto cancel;
2990 }
2991
2992 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2993 MACSEC_SECY_ATTR_PAD) ||
2994 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2995 csid, MACSEC_SECY_ATTR_PAD) ||
2996 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2997 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2998 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2999 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
3000 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
3001 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
3002 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
3003 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
3004 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
3005 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
3006 goto cancel;
3007
3008 if (secy->replay_protect) {
3009 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
3010 goto cancel;
3011 }
3012
3013 nla_nest_end(skb, secy_nest);
3014 return 0;
3015
3016cancel:
3017 nla_nest_cancel(skb, secy_nest);
3018 return 1;
3019}
3020
3021static noinline_for_stack int
3022dump_secy(struct macsec_secy *secy, struct net_device *dev,
3023 struct sk_buff *skb, struct netlink_callback *cb)
3024{
3025 struct macsec_tx_sc_stats tx_sc_stats = {0, };
3026 struct macsec_tx_sa_stats tx_sa_stats = {0, };
3027 struct macsec_rx_sc_stats rx_sc_stats = {0, };
3028 struct macsec_rx_sa_stats rx_sa_stats = {0, };
3029 struct macsec_dev *macsec = netdev_priv(dev);
3030 struct macsec_dev_stats dev_stats = {0, };
3031 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3032 struct nlattr *txsa_list, *rxsc_list;
3033 struct macsec_rx_sc *rx_sc;
3034 struct nlattr *attr;
3035 void *hdr;
3036 int i, j;
3037
3038 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3039 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
3040 if (!hdr)
3041 return -EMSGSIZE;
3042
3043 genl_dump_check_consistent(cb, hdr);
3044
3045 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
3046 goto nla_put_failure;
3047
3048 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
3049 if (!attr)
3050 goto nla_put_failure;
3051 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
3052 goto nla_put_failure;
3053 nla_nest_end(skb, attr);
3054
3055 if (nla_put_secy(secy, skb))
3056 goto nla_put_failure;
3057
3058 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
3059 if (!attr)
3060 goto nla_put_failure;
3061
3062 get_tx_sc_stats(dev, &tx_sc_stats);
3063 if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
3064 nla_nest_cancel(skb, attr);
3065 goto nla_put_failure;
3066 }
3067 nla_nest_end(skb, attr);
3068
3069 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
3070 if (!attr)
3071 goto nla_put_failure;
3072 get_secy_stats(dev, &dev_stats);
3073 if (copy_secy_stats(skb, &dev_stats)) {
3074 nla_nest_cancel(skb, attr);
3075 goto nla_put_failure;
3076 }
3077 nla_nest_end(skb, attr);
3078
3079 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
3080 if (!txsa_list)
3081 goto nla_put_failure;
3082 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
3083 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
3084 struct nlattr *txsa_nest;
3085 u64 pn;
3086 int pn_len;
3087
3088 if (!tx_sa)
3089 continue;
3090
3091 txsa_nest = nla_nest_start_noflag(skb, j++);
3092 if (!txsa_nest) {
3093 nla_nest_cancel(skb, txsa_list);
3094 goto nla_put_failure;
3095 }
3096
3097 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
3098 if (!attr) {
3099 nla_nest_cancel(skb, txsa_nest);
3100 nla_nest_cancel(skb, txsa_list);
3101 goto nla_put_failure;
3102 }
3103 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
3104 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
3105 if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
3106 nla_nest_cancel(skb, attr);
3107 nla_nest_cancel(skb, txsa_nest);
3108 nla_nest_cancel(skb, txsa_list);
3109 goto nla_put_failure;
3110 }
3111 nla_nest_end(skb, attr);
3112
3113 if (secy->xpn) {
3114 pn = tx_sa->next_pn;
3115 pn_len = MACSEC_XPN_PN_LEN;
3116 } else {
3117 pn = tx_sa->next_pn_halves.lower;
3118 pn_len = MACSEC_DEFAULT_PN_LEN;
3119 }
3120
3121 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3122 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3123 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
3124 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
3125 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
3126 nla_nest_cancel(skb, txsa_nest);
3127 nla_nest_cancel(skb, txsa_list);
3128 goto nla_put_failure;
3129 }
3130
3131 nla_nest_end(skb, txsa_nest);
3132 }
3133 nla_nest_end(skb, txsa_list);
3134
3135 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
3136 if (!rxsc_list)
3137 goto nla_put_failure;
3138
3139 j = 1;
3140 for_each_rxsc_rtnl(secy, rx_sc) {
3141 int k;
3142 struct nlattr *rxsa_list;
3143 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
3144
3145 if (!rxsc_nest) {
3146 nla_nest_cancel(skb, rxsc_list);
3147 goto nla_put_failure;
3148 }
3149
3150 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
3151 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
3152 MACSEC_RXSC_ATTR_PAD)) {
3153 nla_nest_cancel(skb, rxsc_nest);
3154 nla_nest_cancel(skb, rxsc_list);
3155 goto nla_put_failure;
3156 }
3157
3158 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
3159 if (!attr) {
3160 nla_nest_cancel(skb, rxsc_nest);
3161 nla_nest_cancel(skb, rxsc_list);
3162 goto nla_put_failure;
3163 }
3164 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
3165 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
3166 if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
3167 nla_nest_cancel(skb, attr);
3168 nla_nest_cancel(skb, rxsc_nest);
3169 nla_nest_cancel(skb, rxsc_list);
3170 goto nla_put_failure;
3171 }
3172 nla_nest_end(skb, attr);
3173
3174 rxsa_list = nla_nest_start_noflag(skb,
3175 MACSEC_RXSC_ATTR_SA_LIST);
3176 if (!rxsa_list) {
3177 nla_nest_cancel(skb, rxsc_nest);
3178 nla_nest_cancel(skb, rxsc_list);
3179 goto nla_put_failure;
3180 }
3181
3182 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
3183 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
3184 struct nlattr *rxsa_nest;
3185 u64 pn;
3186 int pn_len;
3187
3188 if (!rx_sa)
3189 continue;
3190
3191 rxsa_nest = nla_nest_start_noflag(skb, k++);
3192 if (!rxsa_nest) {
3193 nla_nest_cancel(skb, rxsa_list);
3194 nla_nest_cancel(skb, rxsc_nest);
3195 nla_nest_cancel(skb, rxsc_list);
3196 goto nla_put_failure;
3197 }
3198
3199 attr = nla_nest_start_noflag(skb,
3200 MACSEC_SA_ATTR_STATS);
3201 if (!attr) {
3202 nla_nest_cancel(skb, rxsa_list);
3203 nla_nest_cancel(skb, rxsc_nest);
3204 nla_nest_cancel(skb, rxsc_list);
3205 goto nla_put_failure;
3206 }
3207 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
3208 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
3209 if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
3210 nla_nest_cancel(skb, attr);
3211 nla_nest_cancel(skb, rxsa_list);
3212 nla_nest_cancel(skb, rxsc_nest);
3213 nla_nest_cancel(skb, rxsc_list);
3214 goto nla_put_failure;
3215 }
3216 nla_nest_end(skb, attr);
3217
3218 if (secy->xpn) {
3219 pn = rx_sa->next_pn;
3220 pn_len = MACSEC_XPN_PN_LEN;
3221 } else {
3222 pn = rx_sa->next_pn_halves.lower;
3223 pn_len = MACSEC_DEFAULT_PN_LEN;
3224 }
3225
3226 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3227 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3228 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
3229 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
3230 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
3231 nla_nest_cancel(skb, rxsa_nest);
3232 nla_nest_cancel(skb, rxsc_nest);
3233 nla_nest_cancel(skb, rxsc_list);
3234 goto nla_put_failure;
3235 }
3236 nla_nest_end(skb, rxsa_nest);
3237 }
3238
3239 nla_nest_end(skb, rxsa_list);
3240 nla_nest_end(skb, rxsc_nest);
3241 }
3242
3243 nla_nest_end(skb, rxsc_list);
3244
3245 genlmsg_end(skb, hdr);
3246
3247 return 0;
3248
3249nla_put_failure:
3250 genlmsg_cancel(skb, hdr);
3251 return -EMSGSIZE;
3252}
3253
3254static int macsec_generation = 1; /* protected by RTNL */
3255
3256static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
3257{
3258 struct net *net = sock_net(skb->sk);
3259 struct net_device *dev;
3260 int dev_idx, d;
3261
3262 dev_idx = cb->args[0];
3263
3264 d = 0;
3265 rtnl_lock();
3266
3267 cb->seq = macsec_generation;
3268
3269 for_each_netdev(net, dev) {
3270 struct macsec_secy *secy;
3271
3272 if (d < dev_idx)
3273 goto next;
3274
3275 if (!netif_is_macsec(dev))
3276 goto next;
3277
3278 secy = &macsec_priv(dev)->secy;
3279 if (dump_secy(secy, dev, skb, cb) < 0)
3280 goto done;
3281next:
3282 d++;
3283 }
3284
3285done:
3286 rtnl_unlock();
3287 cb->args[0] = d;
3288 return skb->len;
3289}
3290
3291static const struct genl_small_ops macsec_genl_ops[] = {
3292 {
3293 .cmd = MACSEC_CMD_GET_TXSC,
3294 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3295 .dumpit = macsec_dump_txsc,
3296 },
3297 {
3298 .cmd = MACSEC_CMD_ADD_RXSC,
3299 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3300 .doit = macsec_add_rxsc,
3301 .flags = GENL_ADMIN_PERM,
3302 },
3303 {
3304 .cmd = MACSEC_CMD_DEL_RXSC,
3305 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3306 .doit = macsec_del_rxsc,
3307 .flags = GENL_ADMIN_PERM,
3308 },
3309 {
3310 .cmd = MACSEC_CMD_UPD_RXSC,
3311 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3312 .doit = macsec_upd_rxsc,
3313 .flags = GENL_ADMIN_PERM,
3314 },
3315 {
3316 .cmd = MACSEC_CMD_ADD_TXSA,
3317 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3318 .doit = macsec_add_txsa,
3319 .flags = GENL_ADMIN_PERM,
3320 },
3321 {
3322 .cmd = MACSEC_CMD_DEL_TXSA,
3323 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3324 .doit = macsec_del_txsa,
3325 .flags = GENL_ADMIN_PERM,
3326 },
3327 {
3328 .cmd = MACSEC_CMD_UPD_TXSA,
3329 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3330 .doit = macsec_upd_txsa,
3331 .flags = GENL_ADMIN_PERM,
3332 },
3333 {
3334 .cmd = MACSEC_CMD_ADD_RXSA,
3335 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3336 .doit = macsec_add_rxsa,
3337 .flags = GENL_ADMIN_PERM,
3338 },
3339 {
3340 .cmd = MACSEC_CMD_DEL_RXSA,
3341 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3342 .doit = macsec_del_rxsa,
3343 .flags = GENL_ADMIN_PERM,
3344 },
3345 {
3346 .cmd = MACSEC_CMD_UPD_RXSA,
3347 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3348 .doit = macsec_upd_rxsa,
3349 .flags = GENL_ADMIN_PERM,
3350 },
3351 {
3352 .cmd = MACSEC_CMD_UPD_OFFLOAD,
3353 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3354 .doit = macsec_upd_offload,
3355 .flags = GENL_ADMIN_PERM,
3356 },
3357};
3358
3359static struct genl_family macsec_fam __ro_after_init = {
3360 .name = MACSEC_GENL_NAME,
3361 .hdrsize = 0,
3362 .version = MACSEC_GENL_VERSION,
3363 .maxattr = MACSEC_ATTR_MAX,
3364 .policy = macsec_genl_policy,
3365 .netnsok = true,
3366 .module = THIS_MODULE,
3367 .small_ops = macsec_genl_ops,
3368 .n_small_ops = ARRAY_SIZE(macsec_genl_ops),
3369};
3370
3371static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3372 struct net_device *dev)
3373{
3374 struct macsec_dev *macsec = netdev_priv(dev);
3375 struct macsec_secy *secy = &macsec->secy;
3376 struct pcpu_secy_stats *secy_stats;
3377 int ret, len;
3378
3379 if (macsec_is_offloaded(netdev_priv(dev))) {
3380 skb->dev = macsec->real_dev;
3381 return dev_queue_xmit(skb);
3382 }
3383
3384 /* 10.5 */
3385 if (!secy->protect_frames) {
3386 secy_stats = this_cpu_ptr(macsec->stats);
3387 u64_stats_update_begin(&secy_stats->syncp);
3388 secy_stats->stats.OutPktsUntagged++;
3389 u64_stats_update_end(&secy_stats->syncp);
3390 skb->dev = macsec->real_dev;
3391 len = skb->len;
3392 ret = dev_queue_xmit(skb);
3393 count_tx(dev, ret, len);
3394 return ret;
3395 }
3396
3397 if (!secy->operational) {
3398 kfree_skb(skb);
3399 dev->stats.tx_dropped++;
3400 return NETDEV_TX_OK;
3401 }
3402
3403 skb = macsec_encrypt(skb, dev);
3404 if (IS_ERR(skb)) {
3405 if (PTR_ERR(skb) != -EINPROGRESS)
3406 dev->stats.tx_dropped++;
3407 return NETDEV_TX_OK;
3408 }
3409
3410 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3411
3412 macsec_encrypt_finish(skb, dev);
3413 len = skb->len;
3414 ret = dev_queue_xmit(skb);
3415 count_tx(dev, ret, len);
3416 return ret;
3417}
3418
3419#define SW_MACSEC_FEATURES \
3420 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3421
3422/* If h/w offloading is enabled, use real device features save for
3423 * VLAN_FEATURES - they require additional ops
3424 * HW_MACSEC - no reason to report it
3425 */
3426#define REAL_DEV_FEATURES(dev) \
3427 ((dev)->features & ~(NETIF_F_VLAN_FEATURES | NETIF_F_HW_MACSEC))
3428
3429static int macsec_dev_init(struct net_device *dev)
3430{
3431 struct macsec_dev *macsec = macsec_priv(dev);
3432 struct net_device *real_dev = macsec->real_dev;
3433 int err;
3434
3435 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3436 if (!dev->tstats)
3437 return -ENOMEM;
3438
3439 err = gro_cells_init(&macsec->gro_cells, dev);
3440 if (err) {
3441 free_percpu(dev->tstats);
3442 return err;
3443 }
3444
3445 if (macsec_is_offloaded(macsec)) {
3446 dev->features = REAL_DEV_FEATURES(real_dev);
3447 } else {
3448 dev->features = real_dev->features & SW_MACSEC_FEATURES;
3449 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
3450 }
3451
3452 dev->needed_headroom = real_dev->needed_headroom +
3453 MACSEC_NEEDED_HEADROOM;
3454 dev->needed_tailroom = real_dev->needed_tailroom +
3455 MACSEC_NEEDED_TAILROOM;
3456
3457 if (is_zero_ether_addr(dev->dev_addr))
3458 eth_hw_addr_inherit(dev, real_dev);
3459 if (is_zero_ether_addr(dev->broadcast))
3460 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3461
3462 return 0;
3463}
3464
3465static void macsec_dev_uninit(struct net_device *dev)
3466{
3467 struct macsec_dev *macsec = macsec_priv(dev);
3468
3469 gro_cells_destroy(&macsec->gro_cells);
3470 free_percpu(dev->tstats);
3471}
3472
3473static netdev_features_t macsec_fix_features(struct net_device *dev,
3474 netdev_features_t features)
3475{
3476 struct macsec_dev *macsec = macsec_priv(dev);
3477 struct net_device *real_dev = macsec->real_dev;
3478
3479 if (macsec_is_offloaded(macsec))
3480 return REAL_DEV_FEATURES(real_dev);
3481
3482 features &= (real_dev->features & SW_MACSEC_FEATURES) |
3483 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3484 features |= NETIF_F_LLTX;
3485
3486 return features;
3487}
3488
3489static int macsec_dev_open(struct net_device *dev)
3490{
3491 struct macsec_dev *macsec = macsec_priv(dev);
3492 struct net_device *real_dev = macsec->real_dev;
3493 int err;
3494
3495 err = dev_uc_add(real_dev, dev->dev_addr);
3496 if (err < 0)
3497 return err;
3498
3499 if (dev->flags & IFF_ALLMULTI) {
3500 err = dev_set_allmulti(real_dev, 1);
3501 if (err < 0)
3502 goto del_unicast;
3503 }
3504
3505 if (dev->flags & IFF_PROMISC) {
3506 err = dev_set_promiscuity(real_dev, 1);
3507 if (err < 0)
3508 goto clear_allmulti;
3509 }
3510
3511 /* If h/w offloading is available, propagate to the device */
3512 if (macsec_is_offloaded(macsec)) {
3513 const struct macsec_ops *ops;
3514 struct macsec_context ctx;
3515
3516 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3517 if (!ops) {
3518 err = -EOPNOTSUPP;
3519 goto clear_allmulti;
3520 }
3521
3522 ctx.secy = &macsec->secy;
3523 err = macsec_offload(ops->mdo_dev_open, &ctx);
3524 if (err)
3525 goto clear_allmulti;
3526 }
3527
3528 if (netif_carrier_ok(real_dev))
3529 netif_carrier_on(dev);
3530
3531 return 0;
3532clear_allmulti:
3533 if (dev->flags & IFF_ALLMULTI)
3534 dev_set_allmulti(real_dev, -1);
3535del_unicast:
3536 dev_uc_del(real_dev, dev->dev_addr);
3537 netif_carrier_off(dev);
3538 return err;
3539}
3540
3541static int macsec_dev_stop(struct net_device *dev)
3542{
3543 struct macsec_dev *macsec = macsec_priv(dev);
3544 struct net_device *real_dev = macsec->real_dev;
3545
3546 netif_carrier_off(dev);
3547
3548 /* If h/w offloading is available, propagate to the device */
3549 if (macsec_is_offloaded(macsec)) {
3550 const struct macsec_ops *ops;
3551 struct macsec_context ctx;
3552
3553 ops = macsec_get_ops(macsec, &ctx);
3554 if (ops) {
3555 ctx.secy = &macsec->secy;
3556 macsec_offload(ops->mdo_dev_stop, &ctx);
3557 }
3558 }
3559
3560 dev_mc_unsync(real_dev, dev);
3561 dev_uc_unsync(real_dev, dev);
3562
3563 if (dev->flags & IFF_ALLMULTI)
3564 dev_set_allmulti(real_dev, -1);
3565
3566 if (dev->flags & IFF_PROMISC)
3567 dev_set_promiscuity(real_dev, -1);
3568
3569 dev_uc_del(real_dev, dev->dev_addr);
3570
3571 return 0;
3572}
3573
3574static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3575{
3576 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3577
3578 if (!(dev->flags & IFF_UP))
3579 return;
3580
3581 if (change & IFF_ALLMULTI)
3582 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3583
3584 if (change & IFF_PROMISC)
3585 dev_set_promiscuity(real_dev,
3586 dev->flags & IFF_PROMISC ? 1 : -1);
3587}
3588
3589static void macsec_dev_set_rx_mode(struct net_device *dev)
3590{
3591 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3592
3593 dev_mc_sync(real_dev, dev);
3594 dev_uc_sync(real_dev, dev);
3595}
3596
3597static int macsec_set_mac_address(struct net_device *dev, void *p)
3598{
3599 struct macsec_dev *macsec = macsec_priv(dev);
3600 struct net_device *real_dev = macsec->real_dev;
3601 struct sockaddr *addr = p;
3602 int err;
3603
3604 if (!is_valid_ether_addr(addr->sa_data))
3605 return -EADDRNOTAVAIL;
3606
3607 if (!(dev->flags & IFF_UP))
3608 goto out;
3609
3610 err = dev_uc_add(real_dev, addr->sa_data);
3611 if (err < 0)
3612 return err;
3613
3614 dev_uc_del(real_dev, dev->dev_addr);
3615
3616out:
3617 ether_addr_copy(dev->dev_addr, addr->sa_data);
3618 macsec->secy.sci = dev_to_sci(dev, MACSEC_PORT_ES);
3619
3620 /* If h/w offloading is available, propagate to the device */
3621 if (macsec_is_offloaded(macsec)) {
3622 const struct macsec_ops *ops;
3623 struct macsec_context ctx;
3624
3625 ops = macsec_get_ops(macsec, &ctx);
3626 if (ops) {
3627 ctx.secy = &macsec->secy;
3628 macsec_offload(ops->mdo_upd_secy, &ctx);
3629 }
3630 }
3631
3632 return 0;
3633}
3634
3635static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3636{
3637 struct macsec_dev *macsec = macsec_priv(dev);
3638 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3639
3640 if (macsec->real_dev->mtu - extra < new_mtu)
3641 return -ERANGE;
3642
3643 dev->mtu = new_mtu;
3644
3645 return 0;
3646}
3647
3648static void macsec_get_stats64(struct net_device *dev,
3649 struct rtnl_link_stats64 *s)
3650{
3651 if (!dev->tstats)
3652 return;
3653
3654 dev_fetch_sw_netstats(s, dev->tstats);
3655
3656 s->rx_dropped = dev->stats.rx_dropped;
3657 s->tx_dropped = dev->stats.tx_dropped;
3658}
3659
3660static int macsec_get_iflink(const struct net_device *dev)
3661{
3662 return macsec_priv(dev)->real_dev->ifindex;
3663}
3664
3665static const struct net_device_ops macsec_netdev_ops = {
3666 .ndo_init = macsec_dev_init,
3667 .ndo_uninit = macsec_dev_uninit,
3668 .ndo_open = macsec_dev_open,
3669 .ndo_stop = macsec_dev_stop,
3670 .ndo_fix_features = macsec_fix_features,
3671 .ndo_change_mtu = macsec_change_mtu,
3672 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
3673 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
3674 .ndo_set_mac_address = macsec_set_mac_address,
3675 .ndo_start_xmit = macsec_start_xmit,
3676 .ndo_get_stats64 = macsec_get_stats64,
3677 .ndo_get_iflink = macsec_get_iflink,
3678};
3679
3680static const struct device_type macsec_type = {
3681 .name = "macsec",
3682};
3683
3684static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3685 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3686 [IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3687 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3688 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3689 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3690 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3691 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3692 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3693 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3694 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3695 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3696 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3697 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3698};
3699
3700static void macsec_free_netdev(struct net_device *dev)
3701{
3702 struct macsec_dev *macsec = macsec_priv(dev);
3703
3704 free_percpu(macsec->stats);
3705 free_percpu(macsec->secy.tx_sc.stats);
3706
3707}
3708
3709static void macsec_setup(struct net_device *dev)
3710{
3711 ether_setup(dev);
3712 dev->min_mtu = 0;
3713 dev->max_mtu = ETH_MAX_MTU;
3714 dev->priv_flags |= IFF_NO_QUEUE;
3715 dev->netdev_ops = &macsec_netdev_ops;
3716 dev->needs_free_netdev = true;
3717 dev->priv_destructor = macsec_free_netdev;
3718 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3719
3720 eth_zero_addr(dev->broadcast);
3721}
3722
3723static int macsec_changelink_common(struct net_device *dev,
3724 struct nlattr *data[])
3725{
3726 struct macsec_secy *secy;
3727 struct macsec_tx_sc *tx_sc;
3728
3729 secy = &macsec_priv(dev)->secy;
3730 tx_sc = &secy->tx_sc;
3731
3732 if (data[IFLA_MACSEC_ENCODING_SA]) {
3733 struct macsec_tx_sa *tx_sa;
3734
3735 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3736 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3737
3738 secy->operational = tx_sa && tx_sa->active;
3739 }
3740
3741 if (data[IFLA_MACSEC_WINDOW])
3742 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3743
3744 if (data[IFLA_MACSEC_ENCRYPT])
3745 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3746
3747 if (data[IFLA_MACSEC_PROTECT])
3748 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3749
3750 if (data[IFLA_MACSEC_INC_SCI])
3751 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3752
3753 if (data[IFLA_MACSEC_ES])
3754 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3755
3756 if (data[IFLA_MACSEC_SCB])
3757 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3758
3759 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3760 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3761
3762 if (data[IFLA_MACSEC_VALIDATION])
3763 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3764
3765 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3766 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3767 case MACSEC_CIPHER_ID_GCM_AES_128:
3768 case MACSEC_DEFAULT_CIPHER_ID:
3769 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3770 secy->xpn = false;
3771 break;
3772 case MACSEC_CIPHER_ID_GCM_AES_256:
3773 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3774 secy->xpn = false;
3775 break;
3776 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
3777 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3778 secy->xpn = true;
3779 break;
3780 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
3781 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3782 secy->xpn = true;
3783 break;
3784 default:
3785 return -EINVAL;
3786 }
3787 }
3788
3789 return 0;
3790}
3791
3792static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3793 struct nlattr *data[],
3794 struct netlink_ext_ack *extack)
3795{
3796 struct macsec_dev *macsec = macsec_priv(dev);
3797 struct macsec_tx_sc tx_sc;
3798 struct macsec_secy secy;
3799 int ret;
3800
3801 if (!data)
3802 return 0;
3803
3804 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3805 data[IFLA_MACSEC_ICV_LEN] ||
3806 data[IFLA_MACSEC_SCI] ||
3807 data[IFLA_MACSEC_PORT])
3808 return -EINVAL;
3809
3810 /* Keep a copy of unmodified secy and tx_sc, in case the offload
3811 * propagation fails, to revert macsec_changelink_common.
3812 */
3813 memcpy(&secy, &macsec->secy, sizeof(secy));
3814 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3815
3816 ret = macsec_changelink_common(dev, data);
3817 if (ret)
3818 return ret;
3819
3820 /* If h/w offloading is available, propagate to the device */
3821 if (macsec_is_offloaded(macsec)) {
3822 const struct macsec_ops *ops;
3823 struct macsec_context ctx;
3824 int ret;
3825
3826 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3827 if (!ops) {
3828 ret = -EOPNOTSUPP;
3829 goto cleanup;
3830 }
3831
3832 ctx.secy = &macsec->secy;
3833 ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3834 if (ret)
3835 goto cleanup;
3836 }
3837
3838 return 0;
3839
3840cleanup:
3841 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3842 memcpy(&macsec->secy, &secy, sizeof(secy));
3843
3844 return ret;
3845}
3846
3847static void macsec_del_dev(struct macsec_dev *macsec)
3848{
3849 int i;
3850
3851 while (macsec->secy.rx_sc) {
3852 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3853
3854 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3855 free_rx_sc(rx_sc);
3856 }
3857
3858 for (i = 0; i < MACSEC_NUM_AN; i++) {
3859 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3860
3861 if (sa) {
3862 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3863 clear_tx_sa(sa);
3864 }
3865 }
3866}
3867
3868static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3869{
3870 struct macsec_dev *macsec = macsec_priv(dev);
3871 struct net_device *real_dev = macsec->real_dev;
3872
3873 unregister_netdevice_queue(dev, head);
3874 list_del_rcu(&macsec->secys);
3875 macsec_del_dev(macsec);
3876 netdev_upper_dev_unlink(real_dev, dev);
3877
3878 macsec_generation++;
3879}
3880
3881static void macsec_dellink(struct net_device *dev, struct list_head *head)
3882{
3883 struct macsec_dev *macsec = macsec_priv(dev);
3884 struct net_device *real_dev = macsec->real_dev;
3885 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3886
3887 /* If h/w offloading is available, propagate to the device */
3888 if (macsec_is_offloaded(macsec)) {
3889 const struct macsec_ops *ops;
3890 struct macsec_context ctx;
3891
3892 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3893 if (ops) {
3894 ctx.secy = &macsec->secy;
3895 macsec_offload(ops->mdo_del_secy, &ctx);
3896 }
3897 }
3898
3899 macsec_common_dellink(dev, head);
3900
3901 if (list_empty(&rxd->secys)) {
3902 netdev_rx_handler_unregister(real_dev);
3903 kfree(rxd);
3904 }
3905}
3906
3907static int register_macsec_dev(struct net_device *real_dev,
3908 struct net_device *dev)
3909{
3910 struct macsec_dev *macsec = macsec_priv(dev);
3911 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3912
3913 if (!rxd) {
3914 int err;
3915
3916 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3917 if (!rxd)
3918 return -ENOMEM;
3919
3920 INIT_LIST_HEAD(&rxd->secys);
3921
3922 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3923 rxd);
3924 if (err < 0) {
3925 kfree(rxd);
3926 return err;
3927 }
3928 }
3929
3930 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3931 return 0;
3932}
3933
3934static bool sci_exists(struct net_device *dev, sci_t sci)
3935{
3936 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3937 struct macsec_dev *macsec;
3938
3939 list_for_each_entry(macsec, &rxd->secys, secys) {
3940 if (macsec->secy.sci == sci)
3941 return true;
3942 }
3943
3944 return false;
3945}
3946
3947static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3948{
3949 struct macsec_dev *macsec = macsec_priv(dev);
3950 struct macsec_secy *secy = &macsec->secy;
3951
3952 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3953 if (!macsec->stats)
3954 return -ENOMEM;
3955
3956 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3957 if (!secy->tx_sc.stats) {
3958 free_percpu(macsec->stats);
3959 return -ENOMEM;
3960 }
3961
3962 if (sci == MACSEC_UNDEF_SCI)
3963 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3964
3965 secy->netdev = dev;
3966 secy->operational = true;
3967 secy->key_len = DEFAULT_SAK_LEN;
3968 secy->icv_len = icv_len;
3969 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3970 secy->protect_frames = true;
3971 secy->replay_protect = false;
3972 secy->xpn = DEFAULT_XPN;
3973
3974 secy->sci = sci;
3975 secy->tx_sc.active = true;
3976 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3977 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3978 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3979 secy->tx_sc.end_station = false;
3980 secy->tx_sc.scb = false;
3981
3982 return 0;
3983}
3984
3985static struct lock_class_key macsec_netdev_addr_lock_key;
3986
3987static int macsec_newlink(struct net *net, struct net_device *dev,
3988 struct nlattr *tb[], struct nlattr *data[],
3989 struct netlink_ext_ack *extack)
3990{
3991 struct macsec_dev *macsec = macsec_priv(dev);
3992 rx_handler_func_t *rx_handler;
3993 u8 icv_len = DEFAULT_ICV_LEN;
3994 struct net_device *real_dev;
3995 int err, mtu;
3996 sci_t sci;
3997
3998 if (!tb[IFLA_LINK])
3999 return -EINVAL;
4000 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
4001 if (!real_dev)
4002 return -ENODEV;
4003 if (real_dev->type != ARPHRD_ETHER)
4004 return -EINVAL;
4005
4006 dev->priv_flags |= IFF_MACSEC;
4007
4008 macsec->real_dev = real_dev;
4009
4010 if (data && data[IFLA_MACSEC_OFFLOAD])
4011 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
4012 else
4013 /* MACsec offloading is off by default */
4014 macsec->offload = MACSEC_OFFLOAD_OFF;
4015
4016 /* Check if the offloading mode is supported by the underlying layers */
4017 if (macsec->offload != MACSEC_OFFLOAD_OFF &&
4018 !macsec_check_offload(macsec->offload, macsec))
4019 return -EOPNOTSUPP;
4020
4021 if (data && data[IFLA_MACSEC_ICV_LEN])
4022 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4023 mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
4024 if (mtu < 0)
4025 dev->mtu = 0;
4026 else
4027 dev->mtu = mtu;
4028
4029 rx_handler = rtnl_dereference(real_dev->rx_handler);
4030 if (rx_handler && rx_handler != macsec_handle_frame)
4031 return -EBUSY;
4032
4033 err = register_netdevice(dev);
4034 if (err < 0)
4035 return err;
4036
4037 netdev_lockdep_set_classes(dev);
4038 lockdep_set_class(&dev->addr_list_lock,
4039 &macsec_netdev_addr_lock_key);
4040
4041 err = netdev_upper_dev_link(real_dev, dev, extack);
4042 if (err < 0)
4043 goto unregister;
4044
4045 /* need to be already registered so that ->init has run and
4046 * the MAC addr is set
4047 */
4048 if (data && data[IFLA_MACSEC_SCI])
4049 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
4050 else if (data && data[IFLA_MACSEC_PORT])
4051 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
4052 else
4053 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4054
4055 if (rx_handler && sci_exists(real_dev, sci)) {
4056 err = -EBUSY;
4057 goto unlink;
4058 }
4059
4060 err = macsec_add_dev(dev, sci, icv_len);
4061 if (err)
4062 goto unlink;
4063
4064 if (data) {
4065 err = macsec_changelink_common(dev, data);
4066 if (err)
4067 goto del_dev;
4068 }
4069
4070 /* If h/w offloading is available, propagate to the device */
4071 if (macsec_is_offloaded(macsec)) {
4072 const struct macsec_ops *ops;
4073 struct macsec_context ctx;
4074
4075 ops = macsec_get_ops(macsec, &ctx);
4076 if (ops) {
4077 ctx.secy = &macsec->secy;
4078 err = macsec_offload(ops->mdo_add_secy, &ctx);
4079 if (err)
4080 goto del_dev;
4081 }
4082 }
4083
4084 err = register_macsec_dev(real_dev, dev);
4085 if (err < 0)
4086 goto del_dev;
4087
4088 netif_stacked_transfer_operstate(real_dev, dev);
4089 linkwatch_fire_event(dev);
4090
4091 macsec_generation++;
4092
4093 return 0;
4094
4095del_dev:
4096 macsec_del_dev(macsec);
4097unlink:
4098 netdev_upper_dev_unlink(real_dev, dev);
4099unregister:
4100 unregister_netdevice(dev);
4101 return err;
4102}
4103
4104static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
4105 struct netlink_ext_ack *extack)
4106{
4107 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
4108 u8 icv_len = DEFAULT_ICV_LEN;
4109 int flag;
4110 bool es, scb, sci;
4111
4112 if (!data)
4113 return 0;
4114
4115 if (data[IFLA_MACSEC_CIPHER_SUITE])
4116 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
4117
4118 if (data[IFLA_MACSEC_ICV_LEN]) {
4119 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4120 if (icv_len != DEFAULT_ICV_LEN) {
4121 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
4122 struct crypto_aead *dummy_tfm;
4123
4124 dummy_tfm = macsec_alloc_tfm(dummy_key,
4125 DEFAULT_SAK_LEN,
4126 icv_len);
4127 if (IS_ERR(dummy_tfm))
4128 return PTR_ERR(dummy_tfm);
4129 crypto_free_aead(dummy_tfm);
4130 }
4131 }
4132
4133 switch (csid) {
4134 case MACSEC_CIPHER_ID_GCM_AES_128:
4135 case MACSEC_CIPHER_ID_GCM_AES_256:
4136 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
4137 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
4138 case MACSEC_DEFAULT_CIPHER_ID:
4139 if (icv_len < MACSEC_MIN_ICV_LEN ||
4140 icv_len > MACSEC_STD_ICV_LEN)
4141 return -EINVAL;
4142 break;
4143 default:
4144 return -EINVAL;
4145 }
4146
4147 if (data[IFLA_MACSEC_ENCODING_SA]) {
4148 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
4149 return -EINVAL;
4150 }
4151
4152 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
4153 flag < IFLA_MACSEC_VALIDATION;
4154 flag++) {
4155 if (data[flag]) {
4156 if (nla_get_u8(data[flag]) > 1)
4157 return -EINVAL;
4158 }
4159 }
4160
4161 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
4162 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
4163 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
4164
4165 if ((sci && (scb || es)) || (scb && es))
4166 return -EINVAL;
4167
4168 if (data[IFLA_MACSEC_VALIDATION] &&
4169 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
4170 return -EINVAL;
4171
4172 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
4173 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
4174 !data[IFLA_MACSEC_WINDOW])
4175 return -EINVAL;
4176
4177 return 0;
4178}
4179
4180static struct net *macsec_get_link_net(const struct net_device *dev)
4181{
4182 return dev_net(macsec_priv(dev)->real_dev);
4183}
4184
4185static size_t macsec_get_size(const struct net_device *dev)
4186{
4187 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
4188 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
4189 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
4190 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
4191 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
4192 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
4193 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
4194 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
4195 nla_total_size(1) + /* IFLA_MACSEC_ES */
4196 nla_total_size(1) + /* IFLA_MACSEC_SCB */
4197 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
4198 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
4199 0;
4200}
4201
4202static int macsec_fill_info(struct sk_buff *skb,
4203 const struct net_device *dev)
4204{
4205 struct macsec_secy *secy = &macsec_priv(dev)->secy;
4206 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
4207 u64 csid;
4208
4209 switch (secy->key_len) {
4210 case MACSEC_GCM_AES_128_SAK_LEN:
4211 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
4212 break;
4213 case MACSEC_GCM_AES_256_SAK_LEN:
4214 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
4215 break;
4216 default:
4217 goto nla_put_failure;
4218 }
4219
4220 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
4221 IFLA_MACSEC_PAD) ||
4222 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
4223 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
4224 csid, IFLA_MACSEC_PAD) ||
4225 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
4226 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
4227 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
4228 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
4229 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
4230 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
4231 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
4232 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
4233 0)
4234 goto nla_put_failure;
4235
4236 if (secy->replay_protect) {
4237 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
4238 goto nla_put_failure;
4239 }
4240
4241 return 0;
4242
4243nla_put_failure:
4244 return -EMSGSIZE;
4245}
4246
4247static struct rtnl_link_ops macsec_link_ops __read_mostly = {
4248 .kind = "macsec",
4249 .priv_size = sizeof(struct macsec_dev),
4250 .maxtype = IFLA_MACSEC_MAX,
4251 .policy = macsec_rtnl_policy,
4252 .setup = macsec_setup,
4253 .validate = macsec_validate_attr,
4254 .newlink = macsec_newlink,
4255 .changelink = macsec_changelink,
4256 .dellink = macsec_dellink,
4257 .get_size = macsec_get_size,
4258 .fill_info = macsec_fill_info,
4259 .get_link_net = macsec_get_link_net,
4260};
4261
4262static bool is_macsec_master(struct net_device *dev)
4263{
4264 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
4265}
4266
4267static int macsec_notify(struct notifier_block *this, unsigned long event,
4268 void *ptr)
4269{
4270 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
4271 LIST_HEAD(head);
4272
4273 if (!is_macsec_master(real_dev))
4274 return NOTIFY_DONE;
4275
4276 switch (event) {
4277 case NETDEV_DOWN:
4278 case NETDEV_UP:
4279 case NETDEV_CHANGE: {
4280 struct macsec_dev *m, *n;
4281 struct macsec_rxh_data *rxd;
4282
4283 rxd = macsec_data_rtnl(real_dev);
4284 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4285 struct net_device *dev = m->secy.netdev;
4286
4287 netif_stacked_transfer_operstate(real_dev, dev);
4288 }
4289 break;
4290 }
4291 case NETDEV_UNREGISTER: {
4292 struct macsec_dev *m, *n;
4293 struct macsec_rxh_data *rxd;
4294
4295 rxd = macsec_data_rtnl(real_dev);
4296 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4297 macsec_common_dellink(m->secy.netdev, &head);
4298 }
4299
4300 netdev_rx_handler_unregister(real_dev);
4301 kfree(rxd);
4302
4303 unregister_netdevice_many(&head);
4304 break;
4305 }
4306 case NETDEV_CHANGEMTU: {
4307 struct macsec_dev *m;
4308 struct macsec_rxh_data *rxd;
4309
4310 rxd = macsec_data_rtnl(real_dev);
4311 list_for_each_entry(m, &rxd->secys, secys) {
4312 struct net_device *dev = m->secy.netdev;
4313 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
4314 macsec_extra_len(true));
4315
4316 if (dev->mtu > mtu)
4317 dev_set_mtu(dev, mtu);
4318 }
4319 }
4320 }
4321
4322 return NOTIFY_OK;
4323}
4324
4325static struct notifier_block macsec_notifier = {
4326 .notifier_call = macsec_notify,
4327};
4328
4329static int __init macsec_init(void)
4330{
4331 int err;
4332
4333 pr_info("MACsec IEEE 802.1AE\n");
4334 err = register_netdevice_notifier(&macsec_notifier);
4335 if (err)
4336 return err;
4337
4338 err = rtnl_link_register(&macsec_link_ops);
4339 if (err)
4340 goto notifier;
4341
4342 err = genl_register_family(&macsec_fam);
4343 if (err)
4344 goto rtnl;
4345
4346 return 0;
4347
4348rtnl:
4349 rtnl_link_unregister(&macsec_link_ops);
4350notifier:
4351 unregister_netdevice_notifier(&macsec_notifier);
4352 return err;
4353}
4354
4355static void __exit macsec_exit(void)
4356{
4357 genl_unregister_family(&macsec_fam);
4358 rtnl_link_unregister(&macsec_link_ops);
4359 unregister_netdevice_notifier(&macsec_notifier);
4360 rcu_barrier();
4361}
4362
4363module_init(macsec_init);
4364module_exit(macsec_exit);
4365
4366MODULE_ALIAS_RTNL_LINK("macsec");
4367MODULE_ALIAS_GENL_FAMILY("macsec");
4368
4369MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
4370MODULE_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 <linux/phy.h>
22#include <linux/byteorder/generic.h>
23#include <linux/if_arp.h>
24
25#include <uapi/linux/if_macsec.h>
26
27#define MACSEC_SCI_LEN 8
28
29/* SecTAG length = macsec_eth_header without the optional SCI */
30#define MACSEC_TAG_LEN 6
31
32struct macsec_eth_header {
33 struct ethhdr eth;
34 /* SecTAG */
35 u8 tci_an;
36#if defined(__LITTLE_ENDIAN_BITFIELD)
37 u8 short_length:6,
38 unused:2;
39#elif defined(__BIG_ENDIAN_BITFIELD)
40 u8 unused:2,
41 short_length:6;
42#else
43#error "Please fix <asm/byteorder.h>"
44#endif
45 __be32 packet_number;
46 u8 secure_channel_id[8]; /* optional */
47} __packed;
48
49#define MACSEC_TCI_VERSION 0x80
50#define MACSEC_TCI_ES 0x40 /* end station */
51#define MACSEC_TCI_SC 0x20 /* SCI present */
52#define MACSEC_TCI_SCB 0x10 /* epon */
53#define MACSEC_TCI_E 0x08 /* encryption */
54#define MACSEC_TCI_C 0x04 /* changed text */
55#define MACSEC_AN_MASK 0x03 /* association number */
56#define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
57
58/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
59#define MIN_NON_SHORT_LEN 48
60
61#define GCM_AES_IV_LEN 12
62#define DEFAULT_ICV_LEN 16
63
64#define for_each_rxsc(secy, sc) \
65 for (sc = rcu_dereference_bh(secy->rx_sc); \
66 sc; \
67 sc = rcu_dereference_bh(sc->next))
68#define for_each_rxsc_rtnl(secy, sc) \
69 for (sc = rtnl_dereference(secy->rx_sc); \
70 sc; \
71 sc = rtnl_dereference(sc->next))
72
73#define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31)))
74
75struct gcm_iv_xpn {
76 union {
77 u8 short_secure_channel_id[4];
78 ssci_t ssci;
79 };
80 __be64 pn;
81} __packed;
82
83struct gcm_iv {
84 union {
85 u8 secure_channel_id[8];
86 sci_t sci;
87 };
88 __be32 pn;
89};
90
91#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
92
93struct pcpu_secy_stats {
94 struct macsec_dev_stats stats;
95 struct u64_stats_sync syncp;
96};
97
98/**
99 * struct macsec_dev - private data
100 * @secy: SecY config
101 * @real_dev: pointer to underlying netdevice
102 * @stats: MACsec device stats
103 * @secys: linked list of SecY's on the underlying device
104 * @offload: status of offloading on the MACsec device
105 */
106struct macsec_dev {
107 struct macsec_secy secy;
108 struct net_device *real_dev;
109 struct pcpu_secy_stats __percpu *stats;
110 struct list_head secys;
111 struct gro_cells gro_cells;
112 enum macsec_offload offload;
113};
114
115/**
116 * struct macsec_rxh_data - rx_handler private argument
117 * @secys: linked list of SecY's on this underlying device
118 */
119struct macsec_rxh_data {
120 struct list_head secys;
121};
122
123static struct macsec_dev *macsec_priv(const struct net_device *dev)
124{
125 return (struct macsec_dev *)netdev_priv(dev);
126}
127
128static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
129{
130 return rcu_dereference_bh(dev->rx_handler_data);
131}
132
133static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
134{
135 return rtnl_dereference(dev->rx_handler_data);
136}
137
138struct macsec_cb {
139 struct aead_request *req;
140 union {
141 struct macsec_tx_sa *tx_sa;
142 struct macsec_rx_sa *rx_sa;
143 };
144 u8 assoc_num;
145 bool valid;
146 bool has_sci;
147};
148
149static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
150{
151 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
152
153 if (!sa || !sa->active)
154 return NULL;
155
156 if (!refcount_inc_not_zero(&sa->refcnt))
157 return NULL;
158
159 return sa;
160}
161
162static void free_rx_sc_rcu(struct rcu_head *head)
163{
164 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
165
166 free_percpu(rx_sc->stats);
167 kfree(rx_sc);
168}
169
170static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
171{
172 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
173}
174
175static void macsec_rxsc_put(struct macsec_rx_sc *sc)
176{
177 if (refcount_dec_and_test(&sc->refcnt))
178 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
179}
180
181static void free_rxsa(struct rcu_head *head)
182{
183 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
184
185 crypto_free_aead(sa->key.tfm);
186 free_percpu(sa->stats);
187 kfree(sa);
188}
189
190static void macsec_rxsa_put(struct macsec_rx_sa *sa)
191{
192 if (refcount_dec_and_test(&sa->refcnt))
193 call_rcu(&sa->rcu, free_rxsa);
194}
195
196static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
197{
198 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
199
200 if (!sa || !sa->active)
201 return NULL;
202
203 if (!refcount_inc_not_zero(&sa->refcnt))
204 return NULL;
205
206 return sa;
207}
208
209static void free_txsa(struct rcu_head *head)
210{
211 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
212
213 crypto_free_aead(sa->key.tfm);
214 free_percpu(sa->stats);
215 kfree(sa);
216}
217
218static void macsec_txsa_put(struct macsec_tx_sa *sa)
219{
220 if (refcount_dec_and_test(&sa->refcnt))
221 call_rcu(&sa->rcu, free_txsa);
222}
223
224static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
225{
226 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
227 return (struct macsec_cb *)skb->cb;
228}
229
230#define MACSEC_PORT_ES (htons(0x0001))
231#define MACSEC_PORT_SCB (0x0000)
232#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
233#define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
234
235#define MACSEC_GCM_AES_128_SAK_LEN 16
236#define MACSEC_GCM_AES_256_SAK_LEN 32
237
238#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
239#define DEFAULT_XPN false
240#define DEFAULT_SEND_SCI true
241#define DEFAULT_ENCRYPT false
242#define DEFAULT_ENCODING_SA 0
243
244static bool send_sci(const struct macsec_secy *secy)
245{
246 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
247
248 return tx_sc->send_sci ||
249 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
250}
251
252static sci_t make_sci(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 != 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 sci_t dev_to_sci(struct net_device *dev, __be16 port)
449{
450 return make_sci(dev->dev_addr, port);
451}
452
453static void __macsec_pn_wrapped(struct macsec_secy *secy,
454 struct macsec_tx_sa *tx_sa)
455{
456 pr_debug("PN wrapped, transitioning to !oper\n");
457 tx_sa->active = false;
458 if (secy->protect_frames)
459 secy->operational = false;
460}
461
462void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
463{
464 spin_lock_bh(&tx_sa->lock);
465 __macsec_pn_wrapped(secy, tx_sa);
466 spin_unlock_bh(&tx_sa->lock);
467}
468EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
469
470static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
471 struct macsec_secy *secy)
472{
473 pn_t pn;
474
475 spin_lock_bh(&tx_sa->lock);
476
477 pn = tx_sa->next_pn_halves;
478 if (secy->xpn)
479 tx_sa->next_pn++;
480 else
481 tx_sa->next_pn_halves.lower++;
482
483 if (tx_sa->next_pn == 0)
484 __macsec_pn_wrapped(secy, tx_sa);
485 spin_unlock_bh(&tx_sa->lock);
486
487 return pn;
488}
489
490static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
491{
492 struct macsec_dev *macsec = netdev_priv(dev);
493
494 skb->dev = macsec->real_dev;
495 skb_reset_mac_header(skb);
496 skb->protocol = eth_hdr(skb)->h_proto;
497}
498
499static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
500 struct macsec_tx_sa *tx_sa)
501{
502 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
503
504 u64_stats_update_begin(&txsc_stats->syncp);
505 if (tx_sc->encrypt) {
506 txsc_stats->stats.OutOctetsEncrypted += skb->len;
507 txsc_stats->stats.OutPktsEncrypted++;
508 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
509 } else {
510 txsc_stats->stats.OutOctetsProtected += skb->len;
511 txsc_stats->stats.OutPktsProtected++;
512 this_cpu_inc(tx_sa->stats->OutPktsProtected);
513 }
514 u64_stats_update_end(&txsc_stats->syncp);
515}
516
517static void count_tx(struct net_device *dev, int ret, int len)
518{
519 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
520 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
521
522 u64_stats_update_begin(&stats->syncp);
523 stats->tx_packets++;
524 stats->tx_bytes += len;
525 u64_stats_update_end(&stats->syncp);
526 }
527}
528
529static void macsec_encrypt_done(struct crypto_async_request *base, int err)
530{
531 struct sk_buff *skb = base->data;
532 struct net_device *dev = skb->dev;
533 struct macsec_dev *macsec = macsec_priv(dev);
534 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
535 int len, ret;
536
537 aead_request_free(macsec_skb_cb(skb)->req);
538
539 rcu_read_lock_bh();
540 macsec_encrypt_finish(skb, dev);
541 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
542 len = skb->len;
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 = 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 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
702
703 dev_hold(skb->dev);
704 ret = crypto_aead_encrypt(req);
705 if (ret == -EINPROGRESS) {
706 return ERR_PTR(ret);
707 } else if (ret != 0) {
708 dev_put(skb->dev);
709 kfree_skb(skb);
710 aead_request_free(req);
711 macsec_txsa_put(tx_sa);
712 return ERR_PTR(-EINVAL);
713 }
714
715 dev_put(skb->dev);
716 aead_request_free(req);
717 macsec_txsa_put(tx_sa);
718
719 return skb;
720}
721
722static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
723{
724 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
725 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
726 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
727 u32 lowest_pn = 0;
728
729 spin_lock(&rx_sa->lock);
730 if (rx_sa->next_pn_halves.lower >= secy->replay_window)
731 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
732
733 /* Now perform replay protection check again
734 * (see IEEE 802.1AE-2006 figure 10-5)
735 */
736 if (secy->replay_protect && pn < lowest_pn &&
737 (!secy->xpn || pn_same_half(pn, lowest_pn))) {
738 spin_unlock(&rx_sa->lock);
739 u64_stats_update_begin(&rxsc_stats->syncp);
740 rxsc_stats->stats.InPktsLate++;
741 u64_stats_update_end(&rxsc_stats->syncp);
742 return false;
743 }
744
745 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
746 u64_stats_update_begin(&rxsc_stats->syncp);
747 if (hdr->tci_an & MACSEC_TCI_E)
748 rxsc_stats->stats.InOctetsDecrypted += skb->len;
749 else
750 rxsc_stats->stats.InOctetsValidated += skb->len;
751 u64_stats_update_end(&rxsc_stats->syncp);
752 }
753
754 if (!macsec_skb_cb(skb)->valid) {
755 spin_unlock(&rx_sa->lock);
756
757 /* 10.6.5 */
758 if (hdr->tci_an & MACSEC_TCI_C ||
759 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
760 u64_stats_update_begin(&rxsc_stats->syncp);
761 rxsc_stats->stats.InPktsNotValid++;
762 u64_stats_update_end(&rxsc_stats->syncp);
763 return false;
764 }
765
766 u64_stats_update_begin(&rxsc_stats->syncp);
767 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
768 rxsc_stats->stats.InPktsInvalid++;
769 this_cpu_inc(rx_sa->stats->InPktsInvalid);
770 } else if (pn < lowest_pn) {
771 rxsc_stats->stats.InPktsDelayed++;
772 } else {
773 rxsc_stats->stats.InPktsUnchecked++;
774 }
775 u64_stats_update_end(&rxsc_stats->syncp);
776 } else {
777 u64_stats_update_begin(&rxsc_stats->syncp);
778 if (pn < lowest_pn) {
779 rxsc_stats->stats.InPktsDelayed++;
780 } else {
781 rxsc_stats->stats.InPktsOK++;
782 this_cpu_inc(rx_sa->stats->InPktsOK);
783 }
784 u64_stats_update_end(&rxsc_stats->syncp);
785
786 // Instead of "pn >=" - to support pn overflow in xpn
787 if (pn + 1 > rx_sa->next_pn_halves.lower) {
788 rx_sa->next_pn_halves.lower = pn + 1;
789 } else if (secy->xpn &&
790 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
791 rx_sa->next_pn_halves.upper++;
792 rx_sa->next_pn_halves.lower = pn + 1;
793 }
794
795 spin_unlock(&rx_sa->lock);
796 }
797
798 return true;
799}
800
801static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
802{
803 skb->pkt_type = PACKET_HOST;
804 skb->protocol = eth_type_trans(skb, dev);
805
806 skb_reset_network_header(skb);
807 if (!skb_transport_header_was_set(skb))
808 skb_reset_transport_header(skb);
809 skb_reset_mac_len(skb);
810}
811
812static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
813{
814 skb->ip_summed = CHECKSUM_NONE;
815 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
816 skb_pull(skb, hdr_len);
817 pskb_trim_unique(skb, skb->len - icv_len);
818}
819
820static void count_rx(struct net_device *dev, int len)
821{
822 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
823
824 u64_stats_update_begin(&stats->syncp);
825 stats->rx_packets++;
826 stats->rx_bytes += len;
827 u64_stats_update_end(&stats->syncp);
828}
829
830static void macsec_decrypt_done(struct crypto_async_request *base, int err)
831{
832 struct sk_buff *skb = base->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 macsec_reset_skb(skb, macsec->secy.netdev);
856
857 len = skb->len;
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 macsec_rxh_data *rxd;
1000 struct macsec_dev *macsec;
1001
1002 rcu_read_lock();
1003 rxd = macsec_data_rcu(skb->dev);
1004
1005 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1006 struct sk_buff *nskb;
1007 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1008 struct net_device *ndev = macsec->secy.netdev;
1009
1010 /* If h/w offloading is enabled, HW decodes frames and strips
1011 * the SecTAG, so we have to deduce which port to deliver to.
1012 */
1013 if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
1014 if (ether_addr_equal_64bits(hdr->h_dest,
1015 ndev->dev_addr)) {
1016 /* exact match, divert skb to this port */
1017 skb->dev = ndev;
1018 skb->pkt_type = PACKET_HOST;
1019 ret = RX_HANDLER_ANOTHER;
1020 goto out;
1021 } else if (is_multicast_ether_addr_64bits(
1022 hdr->h_dest)) {
1023 /* multicast frame, deliver on this port too */
1024 nskb = skb_clone(skb, GFP_ATOMIC);
1025 if (!nskb)
1026 break;
1027
1028 nskb->dev = ndev;
1029 if (ether_addr_equal_64bits(hdr->h_dest,
1030 ndev->broadcast))
1031 nskb->pkt_type = PACKET_BROADCAST;
1032 else
1033 nskb->pkt_type = PACKET_MULTICAST;
1034
1035 netif_rx(nskb);
1036 }
1037 continue;
1038 }
1039
1040 /* 10.6 If the management control validateFrames is not
1041 * Strict, frames without a SecTAG are received, counted, and
1042 * delivered to the Controlled Port
1043 */
1044 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1045 u64_stats_update_begin(&secy_stats->syncp);
1046 secy_stats->stats.InPktsNoTag++;
1047 u64_stats_update_end(&secy_stats->syncp);
1048 continue;
1049 }
1050
1051 /* deliver on this port */
1052 nskb = skb_clone(skb, GFP_ATOMIC);
1053 if (!nskb)
1054 break;
1055
1056 nskb->dev = ndev;
1057
1058 if (netif_rx(nskb) == NET_RX_SUCCESS) {
1059 u64_stats_update_begin(&secy_stats->syncp);
1060 secy_stats->stats.InPktsUntagged++;
1061 u64_stats_update_end(&secy_stats->syncp);
1062 }
1063 }
1064
1065out:
1066 rcu_read_unlock();
1067 return ret;
1068}
1069
1070static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1071{
1072 struct sk_buff *skb = *pskb;
1073 struct net_device *dev = skb->dev;
1074 struct macsec_eth_header *hdr;
1075 struct macsec_secy *secy = NULL;
1076 struct macsec_rx_sc *rx_sc;
1077 struct macsec_rx_sa *rx_sa;
1078 struct macsec_rxh_data *rxd;
1079 struct macsec_dev *macsec;
1080 unsigned int len;
1081 sci_t sci;
1082 u32 hdr_pn;
1083 bool cbit;
1084 struct pcpu_rx_sc_stats *rxsc_stats;
1085 struct pcpu_secy_stats *secy_stats;
1086 bool pulled_sci;
1087 int ret;
1088
1089 if (skb_headroom(skb) < ETH_HLEN)
1090 goto drop_direct;
1091
1092 hdr = macsec_ethhdr(skb);
1093 if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
1094 return handle_not_macsec(skb);
1095
1096 skb = skb_unshare(skb, GFP_ATOMIC);
1097 *pskb = skb;
1098 if (!skb)
1099 return RX_HANDLER_CONSUMED;
1100
1101 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1102 if (!pulled_sci) {
1103 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1104 goto drop_direct;
1105 }
1106
1107 hdr = macsec_ethhdr(skb);
1108
1109 /* Frames with a SecTAG that has the TCI E bit set but the C
1110 * bit clear are discarded, as this reserved encoding is used
1111 * to identify frames with a SecTAG that are not to be
1112 * delivered to the Controlled Port.
1113 */
1114 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1115 return RX_HANDLER_PASS;
1116
1117 /* now, pull the extra length */
1118 if (hdr->tci_an & MACSEC_TCI_SC) {
1119 if (!pulled_sci)
1120 goto drop_direct;
1121 }
1122
1123 /* ethernet header is part of crypto processing */
1124 skb_push(skb, ETH_HLEN);
1125
1126 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1127 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1128 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1129
1130 rcu_read_lock();
1131 rxd = macsec_data_rcu(skb->dev);
1132
1133 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1134 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1135
1136 sc = sc ? macsec_rxsc_get(sc) : NULL;
1137
1138 if (sc) {
1139 secy = &macsec->secy;
1140 rx_sc = sc;
1141 break;
1142 }
1143 }
1144
1145 if (!secy)
1146 goto nosci;
1147
1148 dev = secy->netdev;
1149 macsec = macsec_priv(dev);
1150 secy_stats = this_cpu_ptr(macsec->stats);
1151 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1152
1153 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
1154 u64_stats_update_begin(&secy_stats->syncp);
1155 secy_stats->stats.InPktsBadTag++;
1156 u64_stats_update_end(&secy_stats->syncp);
1157 goto drop_nosa;
1158 }
1159
1160 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1161 if (!rx_sa) {
1162 /* 10.6.1 if the SA is not in use */
1163
1164 /* If validateFrames is Strict or the C bit in the
1165 * SecTAG is set, discard
1166 */
1167 if (hdr->tci_an & MACSEC_TCI_C ||
1168 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1169 u64_stats_update_begin(&rxsc_stats->syncp);
1170 rxsc_stats->stats.InPktsNotUsingSA++;
1171 u64_stats_update_end(&rxsc_stats->syncp);
1172 goto drop_nosa;
1173 }
1174
1175 /* not Strict, the frame (with the SecTAG and ICV
1176 * removed) is delivered to the Controlled Port.
1177 */
1178 u64_stats_update_begin(&rxsc_stats->syncp);
1179 rxsc_stats->stats.InPktsUnusedSA++;
1180 u64_stats_update_end(&rxsc_stats->syncp);
1181 goto deliver;
1182 }
1183
1184 /* First, PN check to avoid decrypting obviously wrong packets */
1185 hdr_pn = ntohl(hdr->packet_number);
1186 if (secy->replay_protect) {
1187 bool late;
1188
1189 spin_lock(&rx_sa->lock);
1190 late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
1191 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
1192
1193 if (secy->xpn)
1194 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
1195 spin_unlock(&rx_sa->lock);
1196
1197 if (late) {
1198 u64_stats_update_begin(&rxsc_stats->syncp);
1199 rxsc_stats->stats.InPktsLate++;
1200 u64_stats_update_end(&rxsc_stats->syncp);
1201 goto drop;
1202 }
1203 }
1204
1205 macsec_skb_cb(skb)->rx_sa = rx_sa;
1206
1207 /* Disabled && !changed text => skip validation */
1208 if (hdr->tci_an & MACSEC_TCI_C ||
1209 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1210 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1211
1212 if (IS_ERR(skb)) {
1213 /* the decrypt callback needs the reference */
1214 if (PTR_ERR(skb) != -EINPROGRESS) {
1215 macsec_rxsa_put(rx_sa);
1216 macsec_rxsc_put(rx_sc);
1217 }
1218 rcu_read_unlock();
1219 *pskb = NULL;
1220 return RX_HANDLER_CONSUMED;
1221 }
1222
1223 if (!macsec_post_decrypt(skb, secy, hdr_pn))
1224 goto drop;
1225
1226deliver:
1227 macsec_finalize_skb(skb, secy->icv_len,
1228 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1229 macsec_reset_skb(skb, secy->netdev);
1230
1231 if (rx_sa)
1232 macsec_rxsa_put(rx_sa);
1233 macsec_rxsc_put(rx_sc);
1234
1235 skb_orphan(skb);
1236 len = skb->len;
1237 ret = gro_cells_receive(&macsec->gro_cells, skb);
1238 if (ret == NET_RX_SUCCESS)
1239 count_rx(dev, len);
1240 else
1241 macsec->secy.netdev->stats.rx_dropped++;
1242
1243 rcu_read_unlock();
1244
1245 *pskb = NULL;
1246 return RX_HANDLER_CONSUMED;
1247
1248drop:
1249 macsec_rxsa_put(rx_sa);
1250drop_nosa:
1251 macsec_rxsc_put(rx_sc);
1252 rcu_read_unlock();
1253drop_direct:
1254 kfree_skb(skb);
1255 *pskb = NULL;
1256 return RX_HANDLER_CONSUMED;
1257
1258nosci:
1259 /* 10.6.1 if the SC is not found */
1260 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1261 if (!cbit)
1262 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1263 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1264
1265 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1266 struct sk_buff *nskb;
1267
1268 secy_stats = this_cpu_ptr(macsec->stats);
1269
1270 /* If validateFrames is Strict or the C bit in the
1271 * SecTAG is set, discard
1272 */
1273 if (cbit ||
1274 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1275 u64_stats_update_begin(&secy_stats->syncp);
1276 secy_stats->stats.InPktsNoSCI++;
1277 u64_stats_update_end(&secy_stats->syncp);
1278 continue;
1279 }
1280
1281 /* not strict, the frame (with the SecTAG and ICV
1282 * removed) is delivered to the Controlled Port.
1283 */
1284 nskb = skb_clone(skb, GFP_ATOMIC);
1285 if (!nskb)
1286 break;
1287
1288 macsec_reset_skb(nskb, macsec->secy.netdev);
1289
1290 ret = netif_rx(nskb);
1291 if (ret == NET_RX_SUCCESS) {
1292 u64_stats_update_begin(&secy_stats->syncp);
1293 secy_stats->stats.InPktsUnknownSCI++;
1294 u64_stats_update_end(&secy_stats->syncp);
1295 } else {
1296 macsec->secy.netdev->stats.rx_dropped++;
1297 }
1298 }
1299
1300 rcu_read_unlock();
1301 *pskb = skb;
1302 return RX_HANDLER_PASS;
1303}
1304
1305static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1306{
1307 struct crypto_aead *tfm;
1308 int ret;
1309
1310 /* Pick a sync gcm(aes) cipher to ensure order is preserved. */
1311 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
1312
1313 if (IS_ERR(tfm))
1314 return tfm;
1315
1316 ret = crypto_aead_setkey(tfm, key, key_len);
1317 if (ret < 0)
1318 goto fail;
1319
1320 ret = crypto_aead_setauthsize(tfm, icv_len);
1321 if (ret < 0)
1322 goto fail;
1323
1324 return tfm;
1325fail:
1326 crypto_free_aead(tfm);
1327 return ERR_PTR(ret);
1328}
1329
1330static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1331 int icv_len)
1332{
1333 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1334 if (!rx_sa->stats)
1335 return -ENOMEM;
1336
1337 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1338 if (IS_ERR(rx_sa->key.tfm)) {
1339 free_percpu(rx_sa->stats);
1340 return PTR_ERR(rx_sa->key.tfm);
1341 }
1342
1343 rx_sa->ssci = MACSEC_UNDEF_SSCI;
1344 rx_sa->active = false;
1345 rx_sa->next_pn = 1;
1346 refcount_set(&rx_sa->refcnt, 1);
1347 spin_lock_init(&rx_sa->lock);
1348
1349 return 0;
1350}
1351
1352static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1353{
1354 rx_sa->active = false;
1355
1356 macsec_rxsa_put(rx_sa);
1357}
1358
1359static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1360{
1361 int i;
1362
1363 for (i = 0; i < MACSEC_NUM_AN; i++) {
1364 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1365
1366 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1367 if (sa)
1368 clear_rx_sa(sa);
1369 }
1370
1371 macsec_rxsc_put(rx_sc);
1372}
1373
1374static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1375{
1376 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1377
1378 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1379 rx_sc;
1380 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1381 if (rx_sc->sci == sci) {
1382 if (rx_sc->active)
1383 secy->n_rx_sc--;
1384 rcu_assign_pointer(*rx_scp, rx_sc->next);
1385 return rx_sc;
1386 }
1387 }
1388
1389 return NULL;
1390}
1391
1392static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1393{
1394 struct macsec_rx_sc *rx_sc;
1395 struct macsec_dev *macsec;
1396 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1397 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1398 struct macsec_secy *secy;
1399
1400 list_for_each_entry(macsec, &rxd->secys, secys) {
1401 if (find_rx_sc_rtnl(&macsec->secy, sci))
1402 return ERR_PTR(-EEXIST);
1403 }
1404
1405 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1406 if (!rx_sc)
1407 return ERR_PTR(-ENOMEM);
1408
1409 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1410 if (!rx_sc->stats) {
1411 kfree(rx_sc);
1412 return ERR_PTR(-ENOMEM);
1413 }
1414
1415 rx_sc->sci = sci;
1416 rx_sc->active = true;
1417 refcount_set(&rx_sc->refcnt, 1);
1418
1419 secy = &macsec_priv(dev)->secy;
1420 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1421 rcu_assign_pointer(secy->rx_sc, rx_sc);
1422
1423 if (rx_sc->active)
1424 secy->n_rx_sc++;
1425
1426 return rx_sc;
1427}
1428
1429static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1430 int icv_len)
1431{
1432 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1433 if (!tx_sa->stats)
1434 return -ENOMEM;
1435
1436 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1437 if (IS_ERR(tx_sa->key.tfm)) {
1438 free_percpu(tx_sa->stats);
1439 return PTR_ERR(tx_sa->key.tfm);
1440 }
1441
1442 tx_sa->ssci = MACSEC_UNDEF_SSCI;
1443 tx_sa->active = false;
1444 refcount_set(&tx_sa->refcnt, 1);
1445 spin_lock_init(&tx_sa->lock);
1446
1447 return 0;
1448}
1449
1450static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1451{
1452 tx_sa->active = false;
1453
1454 macsec_txsa_put(tx_sa);
1455}
1456
1457static struct genl_family macsec_fam;
1458
1459static struct net_device *get_dev_from_nl(struct net *net,
1460 struct nlattr **attrs)
1461{
1462 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1463 struct net_device *dev;
1464
1465 dev = __dev_get_by_index(net, ifindex);
1466 if (!dev)
1467 return ERR_PTR(-ENODEV);
1468
1469 if (!netif_is_macsec(dev))
1470 return ERR_PTR(-ENODEV);
1471
1472 return dev;
1473}
1474
1475static enum macsec_offload nla_get_offload(const struct nlattr *nla)
1476{
1477 return (__force enum macsec_offload)nla_get_u8(nla);
1478}
1479
1480static sci_t nla_get_sci(const struct nlattr *nla)
1481{
1482 return (__force sci_t)nla_get_u64(nla);
1483}
1484
1485static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1486 int padattr)
1487{
1488 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1489}
1490
1491static ssci_t nla_get_ssci(const struct nlattr *nla)
1492{
1493 return (__force ssci_t)nla_get_u32(nla);
1494}
1495
1496static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
1497{
1498 return nla_put_u32(skb, attrtype, (__force u64)value);
1499}
1500
1501static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1502 struct nlattr **attrs,
1503 struct nlattr **tb_sa,
1504 struct net_device **devp,
1505 struct macsec_secy **secyp,
1506 struct macsec_tx_sc **scp,
1507 u8 *assoc_num)
1508{
1509 struct net_device *dev;
1510 struct macsec_secy *secy;
1511 struct macsec_tx_sc *tx_sc;
1512 struct macsec_tx_sa *tx_sa;
1513
1514 if (!tb_sa[MACSEC_SA_ATTR_AN])
1515 return ERR_PTR(-EINVAL);
1516
1517 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1518
1519 dev = get_dev_from_nl(net, attrs);
1520 if (IS_ERR(dev))
1521 return ERR_CAST(dev);
1522
1523 if (*assoc_num >= MACSEC_NUM_AN)
1524 return ERR_PTR(-EINVAL);
1525
1526 secy = &macsec_priv(dev)->secy;
1527 tx_sc = &secy->tx_sc;
1528
1529 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1530 if (!tx_sa)
1531 return ERR_PTR(-ENODEV);
1532
1533 *devp = dev;
1534 *scp = tx_sc;
1535 *secyp = secy;
1536 return tx_sa;
1537}
1538
1539static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1540 struct nlattr **attrs,
1541 struct nlattr **tb_rxsc,
1542 struct net_device **devp,
1543 struct macsec_secy **secyp)
1544{
1545 struct net_device *dev;
1546 struct macsec_secy *secy;
1547 struct macsec_rx_sc *rx_sc;
1548 sci_t sci;
1549
1550 dev = get_dev_from_nl(net, attrs);
1551 if (IS_ERR(dev))
1552 return ERR_CAST(dev);
1553
1554 secy = &macsec_priv(dev)->secy;
1555
1556 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1557 return ERR_PTR(-EINVAL);
1558
1559 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1560 rx_sc = find_rx_sc_rtnl(secy, sci);
1561 if (!rx_sc)
1562 return ERR_PTR(-ENODEV);
1563
1564 *secyp = secy;
1565 *devp = dev;
1566
1567 return rx_sc;
1568}
1569
1570static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1571 struct nlattr **attrs,
1572 struct nlattr **tb_rxsc,
1573 struct nlattr **tb_sa,
1574 struct net_device **devp,
1575 struct macsec_secy **secyp,
1576 struct macsec_rx_sc **scp,
1577 u8 *assoc_num)
1578{
1579 struct macsec_rx_sc *rx_sc;
1580 struct macsec_rx_sa *rx_sa;
1581
1582 if (!tb_sa[MACSEC_SA_ATTR_AN])
1583 return ERR_PTR(-EINVAL);
1584
1585 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1586 if (*assoc_num >= MACSEC_NUM_AN)
1587 return ERR_PTR(-EINVAL);
1588
1589 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1590 if (IS_ERR(rx_sc))
1591 return ERR_CAST(rx_sc);
1592
1593 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1594 if (!rx_sa)
1595 return ERR_PTR(-ENODEV);
1596
1597 *scp = rx_sc;
1598 return rx_sa;
1599}
1600
1601static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1602 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1603 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1604 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1605 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1606};
1607
1608static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1609 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1610 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1611};
1612
1613static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1614 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1615 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1616 [MACSEC_SA_ATTR_PN] = { .type = NLA_MIN_LEN, .len = 4 },
1617 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1618 .len = MACSEC_KEYID_LEN, },
1619 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1620 .len = MACSEC_MAX_KEY_LEN, },
1621 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
1622 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
1623 .len = MACSEC_SALT_LEN, },
1624};
1625
1626static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
1627 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
1628};
1629
1630/* Offloads an operation to a device driver */
1631static int macsec_offload(int (* const func)(struct macsec_context *),
1632 struct macsec_context *ctx)
1633{
1634 int ret;
1635
1636 if (unlikely(!func))
1637 return 0;
1638
1639 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1640 mutex_lock(&ctx->phydev->lock);
1641
1642 /* Phase I: prepare. The drive should fail here if there are going to be
1643 * issues in the commit phase.
1644 */
1645 ctx->prepare = true;
1646 ret = (*func)(ctx);
1647 if (ret)
1648 goto phy_unlock;
1649
1650 /* Phase II: commit. This step cannot fail. */
1651 ctx->prepare = false;
1652 ret = (*func)(ctx);
1653 /* This should never happen: commit is not allowed to fail */
1654 if (unlikely(ret))
1655 WARN(1, "MACsec offloading commit failed (%d)\n", ret);
1656
1657phy_unlock:
1658 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1659 mutex_unlock(&ctx->phydev->lock);
1660
1661 return ret;
1662}
1663
1664static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1665{
1666 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1667 return -EINVAL;
1668
1669 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1670 return -EINVAL;
1671
1672 return 0;
1673}
1674
1675static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1676{
1677 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1678 return -EINVAL;
1679
1680 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1681 return -EINVAL;
1682
1683 return 0;
1684}
1685
1686static bool validate_add_rxsa(struct nlattr **attrs)
1687{
1688 if (!attrs[MACSEC_SA_ATTR_AN] ||
1689 !attrs[MACSEC_SA_ATTR_KEY] ||
1690 !attrs[MACSEC_SA_ATTR_KEYID])
1691 return false;
1692
1693 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1694 return false;
1695
1696 if (attrs[MACSEC_SA_ATTR_PN] &&
1697 *(u64 *)nla_data(attrs[MACSEC_SA_ATTR_PN]) == 0)
1698 return false;
1699
1700 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1701 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1702 return false;
1703 }
1704
1705 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1706 return false;
1707
1708 return true;
1709}
1710
1711static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1712{
1713 struct net_device *dev;
1714 struct nlattr **attrs = info->attrs;
1715 struct macsec_secy *secy;
1716 struct macsec_rx_sc *rx_sc;
1717 struct macsec_rx_sa *rx_sa;
1718 unsigned char assoc_num;
1719 int pn_len;
1720 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1721 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1722 int err;
1723
1724 if (!attrs[MACSEC_ATTR_IFINDEX])
1725 return -EINVAL;
1726
1727 if (parse_sa_config(attrs, tb_sa))
1728 return -EINVAL;
1729
1730 if (parse_rxsc_config(attrs, tb_rxsc))
1731 return -EINVAL;
1732
1733 if (!validate_add_rxsa(tb_sa))
1734 return -EINVAL;
1735
1736 rtnl_lock();
1737 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1738 if (IS_ERR(rx_sc)) {
1739 rtnl_unlock();
1740 return PTR_ERR(rx_sc);
1741 }
1742
1743 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1744
1745 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1746 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1747 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1748 rtnl_unlock();
1749 return -EINVAL;
1750 }
1751
1752 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1753 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1754 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
1755 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1756 rtnl_unlock();
1757 return -EINVAL;
1758 }
1759
1760 if (secy->xpn) {
1761 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
1762 rtnl_unlock();
1763 return -EINVAL;
1764 }
1765
1766 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
1767 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
1768 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
1769 MACSEC_SA_ATTR_SALT);
1770 rtnl_unlock();
1771 return -EINVAL;
1772 }
1773 }
1774
1775 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1776 if (rx_sa) {
1777 rtnl_unlock();
1778 return -EBUSY;
1779 }
1780
1781 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1782 if (!rx_sa) {
1783 rtnl_unlock();
1784 return -ENOMEM;
1785 }
1786
1787 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1788 secy->key_len, secy->icv_len);
1789 if (err < 0) {
1790 kfree(rx_sa);
1791 rtnl_unlock();
1792 return err;
1793 }
1794
1795 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1796 spin_lock_bh(&rx_sa->lock);
1797 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
1798 spin_unlock_bh(&rx_sa->lock);
1799 }
1800
1801 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1802 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1803
1804 rx_sa->sc = rx_sc;
1805
1806 /* If h/w offloading is available, propagate to the device */
1807 if (macsec_is_offloaded(netdev_priv(dev))) {
1808 const struct macsec_ops *ops;
1809 struct macsec_context ctx;
1810
1811 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1812 if (!ops) {
1813 err = -EOPNOTSUPP;
1814 goto cleanup;
1815 }
1816
1817 ctx.sa.assoc_num = assoc_num;
1818 ctx.sa.rx_sa = rx_sa;
1819 ctx.secy = secy;
1820 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1821 MACSEC_KEYID_LEN);
1822
1823 err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1824 if (err)
1825 goto cleanup;
1826 }
1827
1828 if (secy->xpn) {
1829 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
1830 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
1831 MACSEC_SALT_LEN);
1832 }
1833
1834 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1835 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1836
1837 rtnl_unlock();
1838
1839 return 0;
1840
1841cleanup:
1842 kfree(rx_sa);
1843 rtnl_unlock();
1844 return err;
1845}
1846
1847static bool validate_add_rxsc(struct nlattr **attrs)
1848{
1849 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1850 return false;
1851
1852 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1853 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1854 return false;
1855 }
1856
1857 return true;
1858}
1859
1860static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1861{
1862 struct net_device *dev;
1863 sci_t sci = MACSEC_UNDEF_SCI;
1864 struct nlattr **attrs = info->attrs;
1865 struct macsec_rx_sc *rx_sc;
1866 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1867 struct macsec_secy *secy;
1868 bool was_active;
1869 int ret;
1870
1871 if (!attrs[MACSEC_ATTR_IFINDEX])
1872 return -EINVAL;
1873
1874 if (parse_rxsc_config(attrs, tb_rxsc))
1875 return -EINVAL;
1876
1877 if (!validate_add_rxsc(tb_rxsc))
1878 return -EINVAL;
1879
1880 rtnl_lock();
1881 dev = get_dev_from_nl(genl_info_net(info), attrs);
1882 if (IS_ERR(dev)) {
1883 rtnl_unlock();
1884 return PTR_ERR(dev);
1885 }
1886
1887 secy = &macsec_priv(dev)->secy;
1888 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1889
1890 rx_sc = create_rx_sc(dev, sci);
1891 if (IS_ERR(rx_sc)) {
1892 rtnl_unlock();
1893 return PTR_ERR(rx_sc);
1894 }
1895
1896 was_active = rx_sc->active;
1897 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1898 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1899
1900 if (macsec_is_offloaded(netdev_priv(dev))) {
1901 const struct macsec_ops *ops;
1902 struct macsec_context ctx;
1903
1904 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1905 if (!ops) {
1906 ret = -EOPNOTSUPP;
1907 goto cleanup;
1908 }
1909
1910 ctx.rx_sc = rx_sc;
1911 ctx.secy = secy;
1912
1913 ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1914 if (ret)
1915 goto cleanup;
1916 }
1917
1918 rtnl_unlock();
1919
1920 return 0;
1921
1922cleanup:
1923 rx_sc->active = was_active;
1924 rtnl_unlock();
1925 return ret;
1926}
1927
1928static bool validate_add_txsa(struct nlattr **attrs)
1929{
1930 if (!attrs[MACSEC_SA_ATTR_AN] ||
1931 !attrs[MACSEC_SA_ATTR_PN] ||
1932 !attrs[MACSEC_SA_ATTR_KEY] ||
1933 !attrs[MACSEC_SA_ATTR_KEYID])
1934 return false;
1935
1936 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1937 return false;
1938
1939 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1940 return false;
1941
1942 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1943 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1944 return false;
1945 }
1946
1947 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1948 return false;
1949
1950 return true;
1951}
1952
1953static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1954{
1955 struct net_device *dev;
1956 struct nlattr **attrs = info->attrs;
1957 struct macsec_secy *secy;
1958 struct macsec_tx_sc *tx_sc;
1959 struct macsec_tx_sa *tx_sa;
1960 unsigned char assoc_num;
1961 int pn_len;
1962 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1963 bool was_operational;
1964 int err;
1965
1966 if (!attrs[MACSEC_ATTR_IFINDEX])
1967 return -EINVAL;
1968
1969 if (parse_sa_config(attrs, tb_sa))
1970 return -EINVAL;
1971
1972 if (!validate_add_txsa(tb_sa))
1973 return -EINVAL;
1974
1975 rtnl_lock();
1976 dev = get_dev_from_nl(genl_info_net(info), attrs);
1977 if (IS_ERR(dev)) {
1978 rtnl_unlock();
1979 return PTR_ERR(dev);
1980 }
1981
1982 secy = &macsec_priv(dev)->secy;
1983 tx_sc = &secy->tx_sc;
1984
1985 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1986
1987 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1988 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1989 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1990 rtnl_unlock();
1991 return -EINVAL;
1992 }
1993
1994 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1995 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1996 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
1997 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1998 rtnl_unlock();
1999 return -EINVAL;
2000 }
2001
2002 if (secy->xpn) {
2003 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
2004 rtnl_unlock();
2005 return -EINVAL;
2006 }
2007
2008 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
2009 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
2010 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
2011 MACSEC_SA_ATTR_SALT);
2012 rtnl_unlock();
2013 return -EINVAL;
2014 }
2015 }
2016
2017 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
2018 if (tx_sa) {
2019 rtnl_unlock();
2020 return -EBUSY;
2021 }
2022
2023 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
2024 if (!tx_sa) {
2025 rtnl_unlock();
2026 return -ENOMEM;
2027 }
2028
2029 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2030 secy->key_len, secy->icv_len);
2031 if (err < 0) {
2032 kfree(tx_sa);
2033 rtnl_unlock();
2034 return err;
2035 }
2036
2037 spin_lock_bh(&tx_sa->lock);
2038 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2039 spin_unlock_bh(&tx_sa->lock);
2040
2041 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2042 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2043
2044 was_operational = secy->operational;
2045 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
2046 secy->operational = true;
2047
2048 /* If h/w offloading is available, propagate to the device */
2049 if (macsec_is_offloaded(netdev_priv(dev))) {
2050 const struct macsec_ops *ops;
2051 struct macsec_context ctx;
2052
2053 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2054 if (!ops) {
2055 err = -EOPNOTSUPP;
2056 goto cleanup;
2057 }
2058
2059 ctx.sa.assoc_num = assoc_num;
2060 ctx.sa.tx_sa = tx_sa;
2061 ctx.secy = secy;
2062 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2063 MACSEC_KEYID_LEN);
2064
2065 err = macsec_offload(ops->mdo_add_txsa, &ctx);
2066 if (err)
2067 goto cleanup;
2068 }
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 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
2077 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
2078
2079 rtnl_unlock();
2080
2081 return 0;
2082
2083cleanup:
2084 secy->operational = was_operational;
2085 kfree(tx_sa);
2086 rtnl_unlock();
2087 return err;
2088}
2089
2090static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
2091{
2092 struct nlattr **attrs = info->attrs;
2093 struct net_device *dev;
2094 struct macsec_secy *secy;
2095 struct macsec_rx_sc *rx_sc;
2096 struct macsec_rx_sa *rx_sa;
2097 u8 assoc_num;
2098 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2099 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2100 int ret;
2101
2102 if (!attrs[MACSEC_ATTR_IFINDEX])
2103 return -EINVAL;
2104
2105 if (parse_sa_config(attrs, tb_sa))
2106 return -EINVAL;
2107
2108 if (parse_rxsc_config(attrs, tb_rxsc))
2109 return -EINVAL;
2110
2111 rtnl_lock();
2112 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2113 &dev, &secy, &rx_sc, &assoc_num);
2114 if (IS_ERR(rx_sa)) {
2115 rtnl_unlock();
2116 return PTR_ERR(rx_sa);
2117 }
2118
2119 if (rx_sa->active) {
2120 rtnl_unlock();
2121 return -EBUSY;
2122 }
2123
2124 /* If h/w offloading is available, propagate to the device */
2125 if (macsec_is_offloaded(netdev_priv(dev))) {
2126 const struct macsec_ops *ops;
2127 struct macsec_context ctx;
2128
2129 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2130 if (!ops) {
2131 ret = -EOPNOTSUPP;
2132 goto cleanup;
2133 }
2134
2135 ctx.sa.assoc_num = assoc_num;
2136 ctx.sa.rx_sa = rx_sa;
2137 ctx.secy = secy;
2138
2139 ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
2140 if (ret)
2141 goto cleanup;
2142 }
2143
2144 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
2145 clear_rx_sa(rx_sa);
2146
2147 rtnl_unlock();
2148
2149 return 0;
2150
2151cleanup:
2152 rtnl_unlock();
2153 return ret;
2154}
2155
2156static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
2157{
2158 struct nlattr **attrs = info->attrs;
2159 struct net_device *dev;
2160 struct macsec_secy *secy;
2161 struct macsec_rx_sc *rx_sc;
2162 sci_t sci;
2163 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2164 int ret;
2165
2166 if (!attrs[MACSEC_ATTR_IFINDEX])
2167 return -EINVAL;
2168
2169 if (parse_rxsc_config(attrs, tb_rxsc))
2170 return -EINVAL;
2171
2172 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
2173 return -EINVAL;
2174
2175 rtnl_lock();
2176 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2177 if (IS_ERR(dev)) {
2178 rtnl_unlock();
2179 return PTR_ERR(dev);
2180 }
2181
2182 secy = &macsec_priv(dev)->secy;
2183 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2184
2185 rx_sc = del_rx_sc(secy, sci);
2186 if (!rx_sc) {
2187 rtnl_unlock();
2188 return -ENODEV;
2189 }
2190
2191 /* If h/w offloading is available, propagate to the device */
2192 if (macsec_is_offloaded(netdev_priv(dev))) {
2193 const struct macsec_ops *ops;
2194 struct macsec_context ctx;
2195
2196 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2197 if (!ops) {
2198 ret = -EOPNOTSUPP;
2199 goto cleanup;
2200 }
2201
2202 ctx.rx_sc = rx_sc;
2203 ctx.secy = secy;
2204 ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2205 if (ret)
2206 goto cleanup;
2207 }
2208
2209 free_rx_sc(rx_sc);
2210 rtnl_unlock();
2211
2212 return 0;
2213
2214cleanup:
2215 rtnl_unlock();
2216 return ret;
2217}
2218
2219static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2220{
2221 struct nlattr **attrs = info->attrs;
2222 struct net_device *dev;
2223 struct macsec_secy *secy;
2224 struct macsec_tx_sc *tx_sc;
2225 struct macsec_tx_sa *tx_sa;
2226 u8 assoc_num;
2227 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2228 int ret;
2229
2230 if (!attrs[MACSEC_ATTR_IFINDEX])
2231 return -EINVAL;
2232
2233 if (parse_sa_config(attrs, tb_sa))
2234 return -EINVAL;
2235
2236 rtnl_lock();
2237 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2238 &dev, &secy, &tx_sc, &assoc_num);
2239 if (IS_ERR(tx_sa)) {
2240 rtnl_unlock();
2241 return PTR_ERR(tx_sa);
2242 }
2243
2244 if (tx_sa->active) {
2245 rtnl_unlock();
2246 return -EBUSY;
2247 }
2248
2249 /* If h/w offloading is available, propagate to the device */
2250 if (macsec_is_offloaded(netdev_priv(dev))) {
2251 const struct macsec_ops *ops;
2252 struct macsec_context ctx;
2253
2254 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2255 if (!ops) {
2256 ret = -EOPNOTSUPP;
2257 goto cleanup;
2258 }
2259
2260 ctx.sa.assoc_num = assoc_num;
2261 ctx.sa.tx_sa = tx_sa;
2262 ctx.secy = secy;
2263
2264 ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2265 if (ret)
2266 goto cleanup;
2267 }
2268
2269 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2270 clear_tx_sa(tx_sa);
2271
2272 rtnl_unlock();
2273
2274 return 0;
2275
2276cleanup:
2277 rtnl_unlock();
2278 return ret;
2279}
2280
2281static bool validate_upd_sa(struct nlattr **attrs)
2282{
2283 if (!attrs[MACSEC_SA_ATTR_AN] ||
2284 attrs[MACSEC_SA_ATTR_KEY] ||
2285 attrs[MACSEC_SA_ATTR_KEYID] ||
2286 attrs[MACSEC_SA_ATTR_SSCI] ||
2287 attrs[MACSEC_SA_ATTR_SALT])
2288 return false;
2289
2290 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2291 return false;
2292
2293 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
2294 return false;
2295
2296 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2297 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2298 return false;
2299 }
2300
2301 return true;
2302}
2303
2304static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2305{
2306 struct nlattr **attrs = info->attrs;
2307 struct net_device *dev;
2308 struct macsec_secy *secy;
2309 struct macsec_tx_sc *tx_sc;
2310 struct macsec_tx_sa *tx_sa;
2311 u8 assoc_num;
2312 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2313 bool was_operational, was_active;
2314 pn_t prev_pn;
2315 int ret = 0;
2316
2317 prev_pn.full64 = 0;
2318
2319 if (!attrs[MACSEC_ATTR_IFINDEX])
2320 return -EINVAL;
2321
2322 if (parse_sa_config(attrs, tb_sa))
2323 return -EINVAL;
2324
2325 if (!validate_upd_sa(tb_sa))
2326 return -EINVAL;
2327
2328 rtnl_lock();
2329 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2330 &dev, &secy, &tx_sc, &assoc_num);
2331 if (IS_ERR(tx_sa)) {
2332 rtnl_unlock();
2333 return PTR_ERR(tx_sa);
2334 }
2335
2336 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2337 int pn_len;
2338
2339 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2340 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2341 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
2342 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2343 rtnl_unlock();
2344 return -EINVAL;
2345 }
2346
2347 spin_lock_bh(&tx_sa->lock);
2348 prev_pn = tx_sa->next_pn_halves;
2349 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2350 spin_unlock_bh(&tx_sa->lock);
2351 }
2352
2353 was_active = tx_sa->active;
2354 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2355 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2356
2357 was_operational = secy->operational;
2358 if (assoc_num == tx_sc->encoding_sa)
2359 secy->operational = tx_sa->active;
2360
2361 /* If h/w offloading is available, propagate to the device */
2362 if (macsec_is_offloaded(netdev_priv(dev))) {
2363 const struct macsec_ops *ops;
2364 struct macsec_context ctx;
2365
2366 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2367 if (!ops) {
2368 ret = -EOPNOTSUPP;
2369 goto cleanup;
2370 }
2371
2372 ctx.sa.assoc_num = assoc_num;
2373 ctx.sa.tx_sa = tx_sa;
2374 ctx.secy = secy;
2375
2376 ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
2377 if (ret)
2378 goto cleanup;
2379 }
2380
2381 rtnl_unlock();
2382
2383 return 0;
2384
2385cleanup:
2386 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2387 spin_lock_bh(&tx_sa->lock);
2388 tx_sa->next_pn_halves = prev_pn;
2389 spin_unlock_bh(&tx_sa->lock);
2390 }
2391 tx_sa->active = was_active;
2392 secy->operational = was_operational;
2393 rtnl_unlock();
2394 return ret;
2395}
2396
2397static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2398{
2399 struct nlattr **attrs = info->attrs;
2400 struct net_device *dev;
2401 struct macsec_secy *secy;
2402 struct macsec_rx_sc *rx_sc;
2403 struct macsec_rx_sa *rx_sa;
2404 u8 assoc_num;
2405 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2406 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2407 bool was_active;
2408 pn_t prev_pn;
2409 int ret = 0;
2410
2411 prev_pn.full64 = 0;
2412
2413 if (!attrs[MACSEC_ATTR_IFINDEX])
2414 return -EINVAL;
2415
2416 if (parse_rxsc_config(attrs, tb_rxsc))
2417 return -EINVAL;
2418
2419 if (parse_sa_config(attrs, tb_sa))
2420 return -EINVAL;
2421
2422 if (!validate_upd_sa(tb_sa))
2423 return -EINVAL;
2424
2425 rtnl_lock();
2426 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2427 &dev, &secy, &rx_sc, &assoc_num);
2428 if (IS_ERR(rx_sa)) {
2429 rtnl_unlock();
2430 return PTR_ERR(rx_sa);
2431 }
2432
2433 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2434 int pn_len;
2435
2436 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2437 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2438 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
2439 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2440 rtnl_unlock();
2441 return -EINVAL;
2442 }
2443
2444 spin_lock_bh(&rx_sa->lock);
2445 prev_pn = rx_sa->next_pn_halves;
2446 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2447 spin_unlock_bh(&rx_sa->lock);
2448 }
2449
2450 was_active = rx_sa->active;
2451 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2452 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2453
2454 /* If h/w offloading is available, propagate to the device */
2455 if (macsec_is_offloaded(netdev_priv(dev))) {
2456 const struct macsec_ops *ops;
2457 struct macsec_context ctx;
2458
2459 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2460 if (!ops) {
2461 ret = -EOPNOTSUPP;
2462 goto cleanup;
2463 }
2464
2465 ctx.sa.assoc_num = assoc_num;
2466 ctx.sa.rx_sa = rx_sa;
2467 ctx.secy = secy;
2468
2469 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2470 if (ret)
2471 goto cleanup;
2472 }
2473
2474 rtnl_unlock();
2475 return 0;
2476
2477cleanup:
2478 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2479 spin_lock_bh(&rx_sa->lock);
2480 rx_sa->next_pn_halves = prev_pn;
2481 spin_unlock_bh(&rx_sa->lock);
2482 }
2483 rx_sa->active = was_active;
2484 rtnl_unlock();
2485 return ret;
2486}
2487
2488static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2489{
2490 struct nlattr **attrs = info->attrs;
2491 struct net_device *dev;
2492 struct macsec_secy *secy;
2493 struct macsec_rx_sc *rx_sc;
2494 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2495 unsigned int prev_n_rx_sc;
2496 bool was_active;
2497 int ret;
2498
2499 if (!attrs[MACSEC_ATTR_IFINDEX])
2500 return -EINVAL;
2501
2502 if (parse_rxsc_config(attrs, tb_rxsc))
2503 return -EINVAL;
2504
2505 if (!validate_add_rxsc(tb_rxsc))
2506 return -EINVAL;
2507
2508 rtnl_lock();
2509 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2510 if (IS_ERR(rx_sc)) {
2511 rtnl_unlock();
2512 return PTR_ERR(rx_sc);
2513 }
2514
2515 was_active = rx_sc->active;
2516 prev_n_rx_sc = secy->n_rx_sc;
2517 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2518 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2519
2520 if (rx_sc->active != new)
2521 secy->n_rx_sc += new ? 1 : -1;
2522
2523 rx_sc->active = new;
2524 }
2525
2526 /* If h/w offloading is available, propagate to the device */
2527 if (macsec_is_offloaded(netdev_priv(dev))) {
2528 const struct macsec_ops *ops;
2529 struct macsec_context ctx;
2530
2531 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2532 if (!ops) {
2533 ret = -EOPNOTSUPP;
2534 goto cleanup;
2535 }
2536
2537 ctx.rx_sc = rx_sc;
2538 ctx.secy = secy;
2539
2540 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2541 if (ret)
2542 goto cleanup;
2543 }
2544
2545 rtnl_unlock();
2546
2547 return 0;
2548
2549cleanup:
2550 secy->n_rx_sc = prev_n_rx_sc;
2551 rx_sc->active = was_active;
2552 rtnl_unlock();
2553 return ret;
2554}
2555
2556static bool macsec_is_configured(struct macsec_dev *macsec)
2557{
2558 struct macsec_secy *secy = &macsec->secy;
2559 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2560 int i;
2561
2562 if (secy->n_rx_sc > 0)
2563 return true;
2564
2565 for (i = 0; i < MACSEC_NUM_AN; i++)
2566 if (tx_sc->sa[i])
2567 return true;
2568
2569 return false;
2570}
2571
2572static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2573{
2574 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2575 enum macsec_offload offload, prev_offload;
2576 int (*func)(struct macsec_context *ctx);
2577 struct nlattr **attrs = info->attrs;
2578 struct net_device *dev;
2579 const struct macsec_ops *ops;
2580 struct macsec_context ctx;
2581 struct macsec_dev *macsec;
2582 int ret;
2583
2584 if (!attrs[MACSEC_ATTR_IFINDEX])
2585 return -EINVAL;
2586
2587 if (!attrs[MACSEC_ATTR_OFFLOAD])
2588 return -EINVAL;
2589
2590 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2591 attrs[MACSEC_ATTR_OFFLOAD],
2592 macsec_genl_offload_policy, NULL))
2593 return -EINVAL;
2594
2595 dev = get_dev_from_nl(genl_info_net(info), attrs);
2596 if (IS_ERR(dev))
2597 return PTR_ERR(dev);
2598 macsec = macsec_priv(dev);
2599
2600 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE])
2601 return -EINVAL;
2602
2603 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2604 if (macsec->offload == offload)
2605 return 0;
2606
2607 /* Check if the offloading mode is supported by the underlying layers */
2608 if (offload != MACSEC_OFFLOAD_OFF &&
2609 !macsec_check_offload(offload, macsec))
2610 return -EOPNOTSUPP;
2611
2612 /* Check if the net device is busy. */
2613 if (netif_running(dev))
2614 return -EBUSY;
2615
2616 rtnl_lock();
2617
2618 prev_offload = macsec->offload;
2619 macsec->offload = offload;
2620
2621 /* Check if the device already has rules configured: we do not support
2622 * rules migration.
2623 */
2624 if (macsec_is_configured(macsec)) {
2625 ret = -EBUSY;
2626 goto rollback;
2627 }
2628
2629 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2630 macsec, &ctx);
2631 if (!ops) {
2632 ret = -EOPNOTSUPP;
2633 goto rollback;
2634 }
2635
2636 if (prev_offload == MACSEC_OFFLOAD_OFF)
2637 func = ops->mdo_add_secy;
2638 else
2639 func = ops->mdo_del_secy;
2640
2641 ctx.secy = &macsec->secy;
2642 ret = macsec_offload(func, &ctx);
2643 if (ret)
2644 goto rollback;
2645
2646 /* Force features update, since they are different for SW MACSec and
2647 * HW offloading cases.
2648 */
2649 netdev_update_features(dev);
2650
2651 rtnl_unlock();
2652 return 0;
2653
2654rollback:
2655 macsec->offload = prev_offload;
2656
2657 rtnl_unlock();
2658 return ret;
2659}
2660
2661static void get_tx_sa_stats(struct net_device *dev, int an,
2662 struct macsec_tx_sa *tx_sa,
2663 struct macsec_tx_sa_stats *sum)
2664{
2665 struct macsec_dev *macsec = macsec_priv(dev);
2666 int cpu;
2667
2668 /* If h/w offloading is available, propagate to the device */
2669 if (macsec_is_offloaded(macsec)) {
2670 const struct macsec_ops *ops;
2671 struct macsec_context ctx;
2672
2673 ops = macsec_get_ops(macsec, &ctx);
2674 if (ops) {
2675 ctx.sa.assoc_num = an;
2676 ctx.sa.tx_sa = tx_sa;
2677 ctx.stats.tx_sa_stats = sum;
2678 ctx.secy = &macsec_priv(dev)->secy;
2679 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
2680 }
2681 return;
2682 }
2683
2684 for_each_possible_cpu(cpu) {
2685 const struct macsec_tx_sa_stats *stats =
2686 per_cpu_ptr(tx_sa->stats, cpu);
2687
2688 sum->OutPktsProtected += stats->OutPktsProtected;
2689 sum->OutPktsEncrypted += stats->OutPktsEncrypted;
2690 }
2691}
2692
2693static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
2694{
2695 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
2696 sum->OutPktsProtected) ||
2697 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2698 sum->OutPktsEncrypted))
2699 return -EMSGSIZE;
2700
2701 return 0;
2702}
2703
2704static void get_rx_sa_stats(struct net_device *dev,
2705 struct macsec_rx_sc *rx_sc, int an,
2706 struct macsec_rx_sa *rx_sa,
2707 struct macsec_rx_sa_stats *sum)
2708{
2709 struct macsec_dev *macsec = macsec_priv(dev);
2710 int cpu;
2711
2712 /* If h/w offloading is available, propagate to the device */
2713 if (macsec_is_offloaded(macsec)) {
2714 const struct macsec_ops *ops;
2715 struct macsec_context ctx;
2716
2717 ops = macsec_get_ops(macsec, &ctx);
2718 if (ops) {
2719 ctx.sa.assoc_num = an;
2720 ctx.sa.rx_sa = rx_sa;
2721 ctx.stats.rx_sa_stats = sum;
2722 ctx.secy = &macsec_priv(dev)->secy;
2723 ctx.rx_sc = rx_sc;
2724 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
2725 }
2726 return;
2727 }
2728
2729 for_each_possible_cpu(cpu) {
2730 const struct macsec_rx_sa_stats *stats =
2731 per_cpu_ptr(rx_sa->stats, cpu);
2732
2733 sum->InPktsOK += stats->InPktsOK;
2734 sum->InPktsInvalid += stats->InPktsInvalid;
2735 sum->InPktsNotValid += stats->InPktsNotValid;
2736 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
2737 sum->InPktsUnusedSA += stats->InPktsUnusedSA;
2738 }
2739}
2740
2741static int copy_rx_sa_stats(struct sk_buff *skb,
2742 struct macsec_rx_sa_stats *sum)
2743{
2744 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
2745 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
2746 sum->InPktsInvalid) ||
2747 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
2748 sum->InPktsNotValid) ||
2749 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2750 sum->InPktsNotUsingSA) ||
2751 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
2752 sum->InPktsUnusedSA))
2753 return -EMSGSIZE;
2754
2755 return 0;
2756}
2757
2758static void get_rx_sc_stats(struct net_device *dev,
2759 struct macsec_rx_sc *rx_sc,
2760 struct macsec_rx_sc_stats *sum)
2761{
2762 struct macsec_dev *macsec = macsec_priv(dev);
2763 int cpu;
2764
2765 /* If h/w offloading is available, propagate to the device */
2766 if (macsec_is_offloaded(macsec)) {
2767 const struct macsec_ops *ops;
2768 struct macsec_context ctx;
2769
2770 ops = macsec_get_ops(macsec, &ctx);
2771 if (ops) {
2772 ctx.stats.rx_sc_stats = sum;
2773 ctx.secy = &macsec_priv(dev)->secy;
2774 ctx.rx_sc = rx_sc;
2775 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
2776 }
2777 return;
2778 }
2779
2780 for_each_possible_cpu(cpu) {
2781 const struct pcpu_rx_sc_stats *stats;
2782 struct macsec_rx_sc_stats tmp;
2783 unsigned int start;
2784
2785 stats = per_cpu_ptr(rx_sc->stats, cpu);
2786 do {
2787 start = u64_stats_fetch_begin_irq(&stats->syncp);
2788 memcpy(&tmp, &stats->stats, sizeof(tmp));
2789 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2790
2791 sum->InOctetsValidated += tmp.InOctetsValidated;
2792 sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
2793 sum->InPktsUnchecked += tmp.InPktsUnchecked;
2794 sum->InPktsDelayed += tmp.InPktsDelayed;
2795 sum->InPktsOK += tmp.InPktsOK;
2796 sum->InPktsInvalid += tmp.InPktsInvalid;
2797 sum->InPktsLate += tmp.InPktsLate;
2798 sum->InPktsNotValid += tmp.InPktsNotValid;
2799 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2800 sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
2801 }
2802}
2803
2804static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
2805{
2806 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2807 sum->InOctetsValidated,
2808 MACSEC_RXSC_STATS_ATTR_PAD) ||
2809 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2810 sum->InOctetsDecrypted,
2811 MACSEC_RXSC_STATS_ATTR_PAD) ||
2812 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2813 sum->InPktsUnchecked,
2814 MACSEC_RXSC_STATS_ATTR_PAD) ||
2815 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2816 sum->InPktsDelayed,
2817 MACSEC_RXSC_STATS_ATTR_PAD) ||
2818 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2819 sum->InPktsOK,
2820 MACSEC_RXSC_STATS_ATTR_PAD) ||
2821 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2822 sum->InPktsInvalid,
2823 MACSEC_RXSC_STATS_ATTR_PAD) ||
2824 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2825 sum->InPktsLate,
2826 MACSEC_RXSC_STATS_ATTR_PAD) ||
2827 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2828 sum->InPktsNotValid,
2829 MACSEC_RXSC_STATS_ATTR_PAD) ||
2830 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2831 sum->InPktsNotUsingSA,
2832 MACSEC_RXSC_STATS_ATTR_PAD) ||
2833 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2834 sum->InPktsUnusedSA,
2835 MACSEC_RXSC_STATS_ATTR_PAD))
2836 return -EMSGSIZE;
2837
2838 return 0;
2839}
2840
2841static void get_tx_sc_stats(struct net_device *dev,
2842 struct macsec_tx_sc_stats *sum)
2843{
2844 struct macsec_dev *macsec = macsec_priv(dev);
2845 int cpu;
2846
2847 /* If h/w offloading is available, propagate to the device */
2848 if (macsec_is_offloaded(macsec)) {
2849 const struct macsec_ops *ops;
2850 struct macsec_context ctx;
2851
2852 ops = macsec_get_ops(macsec, &ctx);
2853 if (ops) {
2854 ctx.stats.tx_sc_stats = sum;
2855 ctx.secy = &macsec_priv(dev)->secy;
2856 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
2857 }
2858 return;
2859 }
2860
2861 for_each_possible_cpu(cpu) {
2862 const struct pcpu_tx_sc_stats *stats;
2863 struct macsec_tx_sc_stats tmp;
2864 unsigned int start;
2865
2866 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
2867 do {
2868 start = u64_stats_fetch_begin_irq(&stats->syncp);
2869 memcpy(&tmp, &stats->stats, sizeof(tmp));
2870 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2871
2872 sum->OutPktsProtected += tmp.OutPktsProtected;
2873 sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
2874 sum->OutOctetsProtected += tmp.OutOctetsProtected;
2875 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2876 }
2877}
2878
2879static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
2880{
2881 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2882 sum->OutPktsProtected,
2883 MACSEC_TXSC_STATS_ATTR_PAD) ||
2884 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2885 sum->OutPktsEncrypted,
2886 MACSEC_TXSC_STATS_ATTR_PAD) ||
2887 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2888 sum->OutOctetsProtected,
2889 MACSEC_TXSC_STATS_ATTR_PAD) ||
2890 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2891 sum->OutOctetsEncrypted,
2892 MACSEC_TXSC_STATS_ATTR_PAD))
2893 return -EMSGSIZE;
2894
2895 return 0;
2896}
2897
2898static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
2899{
2900 struct macsec_dev *macsec = macsec_priv(dev);
2901 int cpu;
2902
2903 /* If h/w offloading is available, propagate to the device */
2904 if (macsec_is_offloaded(macsec)) {
2905 const struct macsec_ops *ops;
2906 struct macsec_context ctx;
2907
2908 ops = macsec_get_ops(macsec, &ctx);
2909 if (ops) {
2910 ctx.stats.dev_stats = sum;
2911 ctx.secy = &macsec_priv(dev)->secy;
2912 macsec_offload(ops->mdo_get_dev_stats, &ctx);
2913 }
2914 return;
2915 }
2916
2917 for_each_possible_cpu(cpu) {
2918 const struct pcpu_secy_stats *stats;
2919 struct macsec_dev_stats tmp;
2920 unsigned int start;
2921
2922 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
2923 do {
2924 start = u64_stats_fetch_begin_irq(&stats->syncp);
2925 memcpy(&tmp, &stats->stats, sizeof(tmp));
2926 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2927
2928 sum->OutPktsUntagged += tmp.OutPktsUntagged;
2929 sum->InPktsUntagged += tmp.InPktsUntagged;
2930 sum->OutPktsTooLong += tmp.OutPktsTooLong;
2931 sum->InPktsNoTag += tmp.InPktsNoTag;
2932 sum->InPktsBadTag += tmp.InPktsBadTag;
2933 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2934 sum->InPktsNoSCI += tmp.InPktsNoSCI;
2935 sum->InPktsOverrun += tmp.InPktsOverrun;
2936 }
2937}
2938
2939static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
2940{
2941 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2942 sum->OutPktsUntagged,
2943 MACSEC_SECY_STATS_ATTR_PAD) ||
2944 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2945 sum->InPktsUntagged,
2946 MACSEC_SECY_STATS_ATTR_PAD) ||
2947 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2948 sum->OutPktsTooLong,
2949 MACSEC_SECY_STATS_ATTR_PAD) ||
2950 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2951 sum->InPktsNoTag,
2952 MACSEC_SECY_STATS_ATTR_PAD) ||
2953 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2954 sum->InPktsBadTag,
2955 MACSEC_SECY_STATS_ATTR_PAD) ||
2956 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2957 sum->InPktsUnknownSCI,
2958 MACSEC_SECY_STATS_ATTR_PAD) ||
2959 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2960 sum->InPktsNoSCI,
2961 MACSEC_SECY_STATS_ATTR_PAD) ||
2962 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2963 sum->InPktsOverrun,
2964 MACSEC_SECY_STATS_ATTR_PAD))
2965 return -EMSGSIZE;
2966
2967 return 0;
2968}
2969
2970static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2971{
2972 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2973 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
2974 MACSEC_ATTR_SECY);
2975 u64 csid;
2976
2977 if (!secy_nest)
2978 return 1;
2979
2980 switch (secy->key_len) {
2981 case MACSEC_GCM_AES_128_SAK_LEN:
2982 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
2983 break;
2984 case MACSEC_GCM_AES_256_SAK_LEN:
2985 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
2986 break;
2987 default:
2988 goto cancel;
2989 }
2990
2991 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2992 MACSEC_SECY_ATTR_PAD) ||
2993 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2994 csid, MACSEC_SECY_ATTR_PAD) ||
2995 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2996 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2997 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2998 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2999 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
3000 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
3001 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
3002 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
3003 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
3004 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
3005 goto cancel;
3006
3007 if (secy->replay_protect) {
3008 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
3009 goto cancel;
3010 }
3011
3012 nla_nest_end(skb, secy_nest);
3013 return 0;
3014
3015cancel:
3016 nla_nest_cancel(skb, secy_nest);
3017 return 1;
3018}
3019
3020static noinline_for_stack int
3021dump_secy(struct macsec_secy *secy, struct net_device *dev,
3022 struct sk_buff *skb, struct netlink_callback *cb)
3023{
3024 struct macsec_tx_sc_stats tx_sc_stats = {0, };
3025 struct macsec_tx_sa_stats tx_sa_stats = {0, };
3026 struct macsec_rx_sc_stats rx_sc_stats = {0, };
3027 struct macsec_rx_sa_stats rx_sa_stats = {0, };
3028 struct macsec_dev *macsec = netdev_priv(dev);
3029 struct macsec_dev_stats dev_stats = {0, };
3030 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3031 struct nlattr *txsa_list, *rxsc_list;
3032 struct macsec_rx_sc *rx_sc;
3033 struct nlattr *attr;
3034 void *hdr;
3035 int i, j;
3036
3037 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3038 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
3039 if (!hdr)
3040 return -EMSGSIZE;
3041
3042 genl_dump_check_consistent(cb, hdr);
3043
3044 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
3045 goto nla_put_failure;
3046
3047 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
3048 if (!attr)
3049 goto nla_put_failure;
3050 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
3051 goto nla_put_failure;
3052 nla_nest_end(skb, attr);
3053
3054 if (nla_put_secy(secy, skb))
3055 goto nla_put_failure;
3056
3057 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
3058 if (!attr)
3059 goto nla_put_failure;
3060
3061 get_tx_sc_stats(dev, &tx_sc_stats);
3062 if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
3063 nla_nest_cancel(skb, attr);
3064 goto nla_put_failure;
3065 }
3066 nla_nest_end(skb, attr);
3067
3068 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
3069 if (!attr)
3070 goto nla_put_failure;
3071 get_secy_stats(dev, &dev_stats);
3072 if (copy_secy_stats(skb, &dev_stats)) {
3073 nla_nest_cancel(skb, attr);
3074 goto nla_put_failure;
3075 }
3076 nla_nest_end(skb, attr);
3077
3078 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
3079 if (!txsa_list)
3080 goto nla_put_failure;
3081 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
3082 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
3083 struct nlattr *txsa_nest;
3084 u64 pn;
3085 int pn_len;
3086
3087 if (!tx_sa)
3088 continue;
3089
3090 txsa_nest = nla_nest_start_noflag(skb, j++);
3091 if (!txsa_nest) {
3092 nla_nest_cancel(skb, txsa_list);
3093 goto nla_put_failure;
3094 }
3095
3096 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
3097 if (!attr) {
3098 nla_nest_cancel(skb, txsa_nest);
3099 nla_nest_cancel(skb, txsa_list);
3100 goto nla_put_failure;
3101 }
3102 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
3103 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
3104 if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
3105 nla_nest_cancel(skb, attr);
3106 nla_nest_cancel(skb, txsa_nest);
3107 nla_nest_cancel(skb, txsa_list);
3108 goto nla_put_failure;
3109 }
3110 nla_nest_end(skb, attr);
3111
3112 if (secy->xpn) {
3113 pn = tx_sa->next_pn;
3114 pn_len = MACSEC_XPN_PN_LEN;
3115 } else {
3116 pn = tx_sa->next_pn_halves.lower;
3117 pn_len = MACSEC_DEFAULT_PN_LEN;
3118 }
3119
3120 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3121 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3122 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
3123 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
3124 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
3125 nla_nest_cancel(skb, txsa_nest);
3126 nla_nest_cancel(skb, txsa_list);
3127 goto nla_put_failure;
3128 }
3129
3130 nla_nest_end(skb, txsa_nest);
3131 }
3132 nla_nest_end(skb, txsa_list);
3133
3134 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
3135 if (!rxsc_list)
3136 goto nla_put_failure;
3137
3138 j = 1;
3139 for_each_rxsc_rtnl(secy, rx_sc) {
3140 int k;
3141 struct nlattr *rxsa_list;
3142 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
3143
3144 if (!rxsc_nest) {
3145 nla_nest_cancel(skb, rxsc_list);
3146 goto nla_put_failure;
3147 }
3148
3149 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
3150 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
3151 MACSEC_RXSC_ATTR_PAD)) {
3152 nla_nest_cancel(skb, rxsc_nest);
3153 nla_nest_cancel(skb, rxsc_list);
3154 goto nla_put_failure;
3155 }
3156
3157 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
3158 if (!attr) {
3159 nla_nest_cancel(skb, rxsc_nest);
3160 nla_nest_cancel(skb, rxsc_list);
3161 goto nla_put_failure;
3162 }
3163 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
3164 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
3165 if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
3166 nla_nest_cancel(skb, attr);
3167 nla_nest_cancel(skb, rxsc_nest);
3168 nla_nest_cancel(skb, rxsc_list);
3169 goto nla_put_failure;
3170 }
3171 nla_nest_end(skb, attr);
3172
3173 rxsa_list = nla_nest_start_noflag(skb,
3174 MACSEC_RXSC_ATTR_SA_LIST);
3175 if (!rxsa_list) {
3176 nla_nest_cancel(skb, rxsc_nest);
3177 nla_nest_cancel(skb, rxsc_list);
3178 goto nla_put_failure;
3179 }
3180
3181 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
3182 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
3183 struct nlattr *rxsa_nest;
3184 u64 pn;
3185 int pn_len;
3186
3187 if (!rx_sa)
3188 continue;
3189
3190 rxsa_nest = nla_nest_start_noflag(skb, k++);
3191 if (!rxsa_nest) {
3192 nla_nest_cancel(skb, rxsa_list);
3193 nla_nest_cancel(skb, rxsc_nest);
3194 nla_nest_cancel(skb, rxsc_list);
3195 goto nla_put_failure;
3196 }
3197
3198 attr = nla_nest_start_noflag(skb,
3199 MACSEC_SA_ATTR_STATS);
3200 if (!attr) {
3201 nla_nest_cancel(skb, rxsa_list);
3202 nla_nest_cancel(skb, rxsc_nest);
3203 nla_nest_cancel(skb, rxsc_list);
3204 goto nla_put_failure;
3205 }
3206 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
3207 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
3208 if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
3209 nla_nest_cancel(skb, attr);
3210 nla_nest_cancel(skb, rxsa_list);
3211 nla_nest_cancel(skb, rxsc_nest);
3212 nla_nest_cancel(skb, rxsc_list);
3213 goto nla_put_failure;
3214 }
3215 nla_nest_end(skb, attr);
3216
3217 if (secy->xpn) {
3218 pn = rx_sa->next_pn;
3219 pn_len = MACSEC_XPN_PN_LEN;
3220 } else {
3221 pn = rx_sa->next_pn_halves.lower;
3222 pn_len = MACSEC_DEFAULT_PN_LEN;
3223 }
3224
3225 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3226 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3227 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
3228 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
3229 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
3230 nla_nest_cancel(skb, rxsa_nest);
3231 nla_nest_cancel(skb, rxsc_nest);
3232 nla_nest_cancel(skb, rxsc_list);
3233 goto nla_put_failure;
3234 }
3235 nla_nest_end(skb, rxsa_nest);
3236 }
3237
3238 nla_nest_end(skb, rxsa_list);
3239 nla_nest_end(skb, rxsc_nest);
3240 }
3241
3242 nla_nest_end(skb, rxsc_list);
3243
3244 genlmsg_end(skb, hdr);
3245
3246 return 0;
3247
3248nla_put_failure:
3249 genlmsg_cancel(skb, hdr);
3250 return -EMSGSIZE;
3251}
3252
3253static int macsec_generation = 1; /* protected by RTNL */
3254
3255static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
3256{
3257 struct net *net = sock_net(skb->sk);
3258 struct net_device *dev;
3259 int dev_idx, d;
3260
3261 dev_idx = cb->args[0];
3262
3263 d = 0;
3264 rtnl_lock();
3265
3266 cb->seq = macsec_generation;
3267
3268 for_each_netdev(net, dev) {
3269 struct macsec_secy *secy;
3270
3271 if (d < dev_idx)
3272 goto next;
3273
3274 if (!netif_is_macsec(dev))
3275 goto next;
3276
3277 secy = &macsec_priv(dev)->secy;
3278 if (dump_secy(secy, dev, skb, cb) < 0)
3279 goto done;
3280next:
3281 d++;
3282 }
3283
3284done:
3285 rtnl_unlock();
3286 cb->args[0] = d;
3287 return skb->len;
3288}
3289
3290static const struct genl_ops macsec_genl_ops[] = {
3291 {
3292 .cmd = MACSEC_CMD_GET_TXSC,
3293 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3294 .dumpit = macsec_dump_txsc,
3295 },
3296 {
3297 .cmd = MACSEC_CMD_ADD_RXSC,
3298 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3299 .doit = macsec_add_rxsc,
3300 .flags = GENL_ADMIN_PERM,
3301 },
3302 {
3303 .cmd = MACSEC_CMD_DEL_RXSC,
3304 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3305 .doit = macsec_del_rxsc,
3306 .flags = GENL_ADMIN_PERM,
3307 },
3308 {
3309 .cmd = MACSEC_CMD_UPD_RXSC,
3310 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3311 .doit = macsec_upd_rxsc,
3312 .flags = GENL_ADMIN_PERM,
3313 },
3314 {
3315 .cmd = MACSEC_CMD_ADD_TXSA,
3316 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3317 .doit = macsec_add_txsa,
3318 .flags = GENL_ADMIN_PERM,
3319 },
3320 {
3321 .cmd = MACSEC_CMD_DEL_TXSA,
3322 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3323 .doit = macsec_del_txsa,
3324 .flags = GENL_ADMIN_PERM,
3325 },
3326 {
3327 .cmd = MACSEC_CMD_UPD_TXSA,
3328 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3329 .doit = macsec_upd_txsa,
3330 .flags = GENL_ADMIN_PERM,
3331 },
3332 {
3333 .cmd = MACSEC_CMD_ADD_RXSA,
3334 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3335 .doit = macsec_add_rxsa,
3336 .flags = GENL_ADMIN_PERM,
3337 },
3338 {
3339 .cmd = MACSEC_CMD_DEL_RXSA,
3340 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3341 .doit = macsec_del_rxsa,
3342 .flags = GENL_ADMIN_PERM,
3343 },
3344 {
3345 .cmd = MACSEC_CMD_UPD_RXSA,
3346 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3347 .doit = macsec_upd_rxsa,
3348 .flags = GENL_ADMIN_PERM,
3349 },
3350 {
3351 .cmd = MACSEC_CMD_UPD_OFFLOAD,
3352 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3353 .doit = macsec_upd_offload,
3354 .flags = GENL_ADMIN_PERM,
3355 },
3356};
3357
3358static struct genl_family macsec_fam __ro_after_init = {
3359 .name = MACSEC_GENL_NAME,
3360 .hdrsize = 0,
3361 .version = MACSEC_GENL_VERSION,
3362 .maxattr = MACSEC_ATTR_MAX,
3363 .policy = macsec_genl_policy,
3364 .netnsok = true,
3365 .module = THIS_MODULE,
3366 .ops = macsec_genl_ops,
3367 .n_ops = ARRAY_SIZE(macsec_genl_ops),
3368};
3369
3370static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3371 struct net_device *dev)
3372{
3373 struct macsec_dev *macsec = netdev_priv(dev);
3374 struct macsec_secy *secy = &macsec->secy;
3375 struct pcpu_secy_stats *secy_stats;
3376 int ret, len;
3377
3378 if (macsec_is_offloaded(netdev_priv(dev))) {
3379 skb->dev = macsec->real_dev;
3380 return dev_queue_xmit(skb);
3381 }
3382
3383 /* 10.5 */
3384 if (!secy->protect_frames) {
3385 secy_stats = this_cpu_ptr(macsec->stats);
3386 u64_stats_update_begin(&secy_stats->syncp);
3387 secy_stats->stats.OutPktsUntagged++;
3388 u64_stats_update_end(&secy_stats->syncp);
3389 skb->dev = macsec->real_dev;
3390 len = skb->len;
3391 ret = dev_queue_xmit(skb);
3392 count_tx(dev, ret, len);
3393 return ret;
3394 }
3395
3396 if (!secy->operational) {
3397 kfree_skb(skb);
3398 dev->stats.tx_dropped++;
3399 return NETDEV_TX_OK;
3400 }
3401
3402 skb = macsec_encrypt(skb, dev);
3403 if (IS_ERR(skb)) {
3404 if (PTR_ERR(skb) != -EINPROGRESS)
3405 dev->stats.tx_dropped++;
3406 return NETDEV_TX_OK;
3407 }
3408
3409 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3410
3411 macsec_encrypt_finish(skb, dev);
3412 len = skb->len;
3413 ret = dev_queue_xmit(skb);
3414 count_tx(dev, ret, len);
3415 return ret;
3416}
3417
3418#define SW_MACSEC_FEATURES \
3419 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3420
3421/* If h/w offloading is enabled, use real device features save for
3422 * VLAN_FEATURES - they require additional ops
3423 * HW_MACSEC - no reason to report it
3424 */
3425#define REAL_DEV_FEATURES(dev) \
3426 ((dev)->features & ~(NETIF_F_VLAN_FEATURES | NETIF_F_HW_MACSEC))
3427
3428static int macsec_dev_init(struct net_device *dev)
3429{
3430 struct macsec_dev *macsec = macsec_priv(dev);
3431 struct net_device *real_dev = macsec->real_dev;
3432 int err;
3433
3434 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3435 if (!dev->tstats)
3436 return -ENOMEM;
3437
3438 err = gro_cells_init(&macsec->gro_cells, dev);
3439 if (err) {
3440 free_percpu(dev->tstats);
3441 return err;
3442 }
3443
3444 if (macsec_is_offloaded(macsec)) {
3445 dev->features = REAL_DEV_FEATURES(real_dev);
3446 } else {
3447 dev->features = real_dev->features & SW_MACSEC_FEATURES;
3448 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
3449 }
3450
3451 dev->needed_headroom = real_dev->needed_headroom +
3452 MACSEC_NEEDED_HEADROOM;
3453 dev->needed_tailroom = real_dev->needed_tailroom +
3454 MACSEC_NEEDED_TAILROOM;
3455
3456 if (is_zero_ether_addr(dev->dev_addr))
3457 eth_hw_addr_inherit(dev, real_dev);
3458 if (is_zero_ether_addr(dev->broadcast))
3459 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3460
3461 return 0;
3462}
3463
3464static void macsec_dev_uninit(struct net_device *dev)
3465{
3466 struct macsec_dev *macsec = macsec_priv(dev);
3467
3468 gro_cells_destroy(&macsec->gro_cells);
3469 free_percpu(dev->tstats);
3470}
3471
3472static netdev_features_t macsec_fix_features(struct net_device *dev,
3473 netdev_features_t features)
3474{
3475 struct macsec_dev *macsec = macsec_priv(dev);
3476 struct net_device *real_dev = macsec->real_dev;
3477
3478 if (macsec_is_offloaded(macsec))
3479 return REAL_DEV_FEATURES(real_dev);
3480
3481 features &= (real_dev->features & SW_MACSEC_FEATURES) |
3482 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3483 features |= NETIF_F_LLTX;
3484
3485 return features;
3486}
3487
3488static int macsec_dev_open(struct net_device *dev)
3489{
3490 struct macsec_dev *macsec = macsec_priv(dev);
3491 struct net_device *real_dev = macsec->real_dev;
3492 int err;
3493
3494 err = dev_uc_add(real_dev, dev->dev_addr);
3495 if (err < 0)
3496 return err;
3497
3498 if (dev->flags & IFF_ALLMULTI) {
3499 err = dev_set_allmulti(real_dev, 1);
3500 if (err < 0)
3501 goto del_unicast;
3502 }
3503
3504 if (dev->flags & IFF_PROMISC) {
3505 err = dev_set_promiscuity(real_dev, 1);
3506 if (err < 0)
3507 goto clear_allmulti;
3508 }
3509
3510 /* If h/w offloading is available, propagate to the device */
3511 if (macsec_is_offloaded(macsec)) {
3512 const struct macsec_ops *ops;
3513 struct macsec_context ctx;
3514
3515 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3516 if (!ops) {
3517 err = -EOPNOTSUPP;
3518 goto clear_allmulti;
3519 }
3520
3521 ctx.secy = &macsec->secy;
3522 err = macsec_offload(ops->mdo_dev_open, &ctx);
3523 if (err)
3524 goto clear_allmulti;
3525 }
3526
3527 if (netif_carrier_ok(real_dev))
3528 netif_carrier_on(dev);
3529
3530 return 0;
3531clear_allmulti:
3532 if (dev->flags & IFF_ALLMULTI)
3533 dev_set_allmulti(real_dev, -1);
3534del_unicast:
3535 dev_uc_del(real_dev, dev->dev_addr);
3536 netif_carrier_off(dev);
3537 return err;
3538}
3539
3540static int macsec_dev_stop(struct net_device *dev)
3541{
3542 struct macsec_dev *macsec = macsec_priv(dev);
3543 struct net_device *real_dev = macsec->real_dev;
3544
3545 netif_carrier_off(dev);
3546
3547 /* If h/w offloading is available, propagate to the device */
3548 if (macsec_is_offloaded(macsec)) {
3549 const struct macsec_ops *ops;
3550 struct macsec_context ctx;
3551
3552 ops = macsec_get_ops(macsec, &ctx);
3553 if (ops) {
3554 ctx.secy = &macsec->secy;
3555 macsec_offload(ops->mdo_dev_stop, &ctx);
3556 }
3557 }
3558
3559 dev_mc_unsync(real_dev, dev);
3560 dev_uc_unsync(real_dev, dev);
3561
3562 if (dev->flags & IFF_ALLMULTI)
3563 dev_set_allmulti(real_dev, -1);
3564
3565 if (dev->flags & IFF_PROMISC)
3566 dev_set_promiscuity(real_dev, -1);
3567
3568 dev_uc_del(real_dev, dev->dev_addr);
3569
3570 return 0;
3571}
3572
3573static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3574{
3575 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3576
3577 if (!(dev->flags & IFF_UP))
3578 return;
3579
3580 if (change & IFF_ALLMULTI)
3581 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3582
3583 if (change & IFF_PROMISC)
3584 dev_set_promiscuity(real_dev,
3585 dev->flags & IFF_PROMISC ? 1 : -1);
3586}
3587
3588static void macsec_dev_set_rx_mode(struct net_device *dev)
3589{
3590 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3591
3592 dev_mc_sync(real_dev, dev);
3593 dev_uc_sync(real_dev, dev);
3594}
3595
3596static int macsec_set_mac_address(struct net_device *dev, void *p)
3597{
3598 struct macsec_dev *macsec = macsec_priv(dev);
3599 struct net_device *real_dev = macsec->real_dev;
3600 struct sockaddr *addr = p;
3601 int err;
3602
3603 if (!is_valid_ether_addr(addr->sa_data))
3604 return -EADDRNOTAVAIL;
3605
3606 if (!(dev->flags & IFF_UP))
3607 goto out;
3608
3609 err = dev_uc_add(real_dev, addr->sa_data);
3610 if (err < 0)
3611 return err;
3612
3613 dev_uc_del(real_dev, dev->dev_addr);
3614
3615out:
3616 ether_addr_copy(dev->dev_addr, addr->sa_data);
3617 macsec->secy.sci = dev_to_sci(dev, MACSEC_PORT_ES);
3618
3619 /* If h/w offloading is available, propagate to the device */
3620 if (macsec_is_offloaded(macsec)) {
3621 const struct macsec_ops *ops;
3622 struct macsec_context ctx;
3623
3624 ops = macsec_get_ops(macsec, &ctx);
3625 if (ops) {
3626 ctx.secy = &macsec->secy;
3627 macsec_offload(ops->mdo_upd_secy, &ctx);
3628 }
3629 }
3630
3631 return 0;
3632}
3633
3634static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3635{
3636 struct macsec_dev *macsec = macsec_priv(dev);
3637 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3638
3639 if (macsec->real_dev->mtu - extra < new_mtu)
3640 return -ERANGE;
3641
3642 dev->mtu = new_mtu;
3643
3644 return 0;
3645}
3646
3647static void macsec_get_stats64(struct net_device *dev,
3648 struct rtnl_link_stats64 *s)
3649{
3650 int cpu;
3651
3652 if (!dev->tstats)
3653 return;
3654
3655 for_each_possible_cpu(cpu) {
3656 struct pcpu_sw_netstats *stats;
3657 struct pcpu_sw_netstats tmp;
3658 int start;
3659
3660 stats = per_cpu_ptr(dev->tstats, cpu);
3661 do {
3662 start = u64_stats_fetch_begin_irq(&stats->syncp);
3663 tmp.rx_packets = stats->rx_packets;
3664 tmp.rx_bytes = stats->rx_bytes;
3665 tmp.tx_packets = stats->tx_packets;
3666 tmp.tx_bytes = stats->tx_bytes;
3667 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
3668
3669 s->rx_packets += tmp.rx_packets;
3670 s->rx_bytes += tmp.rx_bytes;
3671 s->tx_packets += tmp.tx_packets;
3672 s->tx_bytes += tmp.tx_bytes;
3673 }
3674
3675 s->rx_dropped = dev->stats.rx_dropped;
3676 s->tx_dropped = dev->stats.tx_dropped;
3677}
3678
3679static int macsec_get_iflink(const struct net_device *dev)
3680{
3681 return macsec_priv(dev)->real_dev->ifindex;
3682}
3683
3684static const struct net_device_ops macsec_netdev_ops = {
3685 .ndo_init = macsec_dev_init,
3686 .ndo_uninit = macsec_dev_uninit,
3687 .ndo_open = macsec_dev_open,
3688 .ndo_stop = macsec_dev_stop,
3689 .ndo_fix_features = macsec_fix_features,
3690 .ndo_change_mtu = macsec_change_mtu,
3691 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
3692 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
3693 .ndo_set_mac_address = macsec_set_mac_address,
3694 .ndo_start_xmit = macsec_start_xmit,
3695 .ndo_get_stats64 = macsec_get_stats64,
3696 .ndo_get_iflink = macsec_get_iflink,
3697};
3698
3699static const struct device_type macsec_type = {
3700 .name = "macsec",
3701};
3702
3703static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3704 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3705 [IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3706 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3707 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3708 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3709 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3710 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3711 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3712 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3713 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3714 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3715 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3716 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3717};
3718
3719static void macsec_free_netdev(struct net_device *dev)
3720{
3721 struct macsec_dev *macsec = macsec_priv(dev);
3722
3723 free_percpu(macsec->stats);
3724 free_percpu(macsec->secy.tx_sc.stats);
3725
3726}
3727
3728static void macsec_setup(struct net_device *dev)
3729{
3730 ether_setup(dev);
3731 dev->min_mtu = 0;
3732 dev->max_mtu = ETH_MAX_MTU;
3733 dev->priv_flags |= IFF_NO_QUEUE;
3734 dev->netdev_ops = &macsec_netdev_ops;
3735 dev->needs_free_netdev = true;
3736 dev->priv_destructor = macsec_free_netdev;
3737 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3738
3739 eth_zero_addr(dev->broadcast);
3740}
3741
3742static int macsec_changelink_common(struct net_device *dev,
3743 struct nlattr *data[])
3744{
3745 struct macsec_secy *secy;
3746 struct macsec_tx_sc *tx_sc;
3747
3748 secy = &macsec_priv(dev)->secy;
3749 tx_sc = &secy->tx_sc;
3750
3751 if (data[IFLA_MACSEC_ENCODING_SA]) {
3752 struct macsec_tx_sa *tx_sa;
3753
3754 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3755 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3756
3757 secy->operational = tx_sa && tx_sa->active;
3758 }
3759
3760 if (data[IFLA_MACSEC_WINDOW])
3761 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3762
3763 if (data[IFLA_MACSEC_ENCRYPT])
3764 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3765
3766 if (data[IFLA_MACSEC_PROTECT])
3767 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3768
3769 if (data[IFLA_MACSEC_INC_SCI])
3770 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3771
3772 if (data[IFLA_MACSEC_ES])
3773 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3774
3775 if (data[IFLA_MACSEC_SCB])
3776 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3777
3778 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3779 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3780
3781 if (data[IFLA_MACSEC_VALIDATION])
3782 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3783
3784 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3785 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3786 case MACSEC_CIPHER_ID_GCM_AES_128:
3787 case MACSEC_DEFAULT_CIPHER_ID:
3788 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3789 secy->xpn = false;
3790 break;
3791 case MACSEC_CIPHER_ID_GCM_AES_256:
3792 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3793 secy->xpn = false;
3794 break;
3795 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
3796 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3797 secy->xpn = true;
3798 break;
3799 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
3800 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3801 secy->xpn = true;
3802 break;
3803 default:
3804 return -EINVAL;
3805 }
3806 }
3807
3808 return 0;
3809}
3810
3811static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3812 struct nlattr *data[],
3813 struct netlink_ext_ack *extack)
3814{
3815 struct macsec_dev *macsec = macsec_priv(dev);
3816 struct macsec_tx_sc tx_sc;
3817 struct macsec_secy secy;
3818 int ret;
3819
3820 if (!data)
3821 return 0;
3822
3823 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3824 data[IFLA_MACSEC_ICV_LEN] ||
3825 data[IFLA_MACSEC_SCI] ||
3826 data[IFLA_MACSEC_PORT])
3827 return -EINVAL;
3828
3829 /* Keep a copy of unmodified secy and tx_sc, in case the offload
3830 * propagation fails, to revert macsec_changelink_common.
3831 */
3832 memcpy(&secy, &macsec->secy, sizeof(secy));
3833 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3834
3835 ret = macsec_changelink_common(dev, data);
3836 if (ret)
3837 return ret;
3838
3839 /* If h/w offloading is available, propagate to the device */
3840 if (macsec_is_offloaded(macsec)) {
3841 const struct macsec_ops *ops;
3842 struct macsec_context ctx;
3843 int ret;
3844
3845 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3846 if (!ops) {
3847 ret = -EOPNOTSUPP;
3848 goto cleanup;
3849 }
3850
3851 ctx.secy = &macsec->secy;
3852 ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3853 if (ret)
3854 goto cleanup;
3855 }
3856
3857 return 0;
3858
3859cleanup:
3860 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3861 memcpy(&macsec->secy, &secy, sizeof(secy));
3862
3863 return ret;
3864}
3865
3866static void macsec_del_dev(struct macsec_dev *macsec)
3867{
3868 int i;
3869
3870 while (macsec->secy.rx_sc) {
3871 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3872
3873 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3874 free_rx_sc(rx_sc);
3875 }
3876
3877 for (i = 0; i < MACSEC_NUM_AN; i++) {
3878 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3879
3880 if (sa) {
3881 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3882 clear_tx_sa(sa);
3883 }
3884 }
3885}
3886
3887static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3888{
3889 struct macsec_dev *macsec = macsec_priv(dev);
3890 struct net_device *real_dev = macsec->real_dev;
3891
3892 unregister_netdevice_queue(dev, head);
3893 list_del_rcu(&macsec->secys);
3894 macsec_del_dev(macsec);
3895 netdev_upper_dev_unlink(real_dev, dev);
3896
3897 macsec_generation++;
3898}
3899
3900static void macsec_dellink(struct net_device *dev, struct list_head *head)
3901{
3902 struct macsec_dev *macsec = macsec_priv(dev);
3903 struct net_device *real_dev = macsec->real_dev;
3904 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3905
3906 /* If h/w offloading is available, propagate to the device */
3907 if (macsec_is_offloaded(macsec)) {
3908 const struct macsec_ops *ops;
3909 struct macsec_context ctx;
3910
3911 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3912 if (ops) {
3913 ctx.secy = &macsec->secy;
3914 macsec_offload(ops->mdo_del_secy, &ctx);
3915 }
3916 }
3917
3918 macsec_common_dellink(dev, head);
3919
3920 if (list_empty(&rxd->secys)) {
3921 netdev_rx_handler_unregister(real_dev);
3922 kfree(rxd);
3923 }
3924}
3925
3926static int register_macsec_dev(struct net_device *real_dev,
3927 struct net_device *dev)
3928{
3929 struct macsec_dev *macsec = macsec_priv(dev);
3930 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3931
3932 if (!rxd) {
3933 int err;
3934
3935 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3936 if (!rxd)
3937 return -ENOMEM;
3938
3939 INIT_LIST_HEAD(&rxd->secys);
3940
3941 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3942 rxd);
3943 if (err < 0) {
3944 kfree(rxd);
3945 return err;
3946 }
3947 }
3948
3949 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3950 return 0;
3951}
3952
3953static bool sci_exists(struct net_device *dev, sci_t sci)
3954{
3955 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3956 struct macsec_dev *macsec;
3957
3958 list_for_each_entry(macsec, &rxd->secys, secys) {
3959 if (macsec->secy.sci == sci)
3960 return true;
3961 }
3962
3963 return false;
3964}
3965
3966static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3967{
3968 struct macsec_dev *macsec = macsec_priv(dev);
3969 struct macsec_secy *secy = &macsec->secy;
3970
3971 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3972 if (!macsec->stats)
3973 return -ENOMEM;
3974
3975 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3976 if (!secy->tx_sc.stats) {
3977 free_percpu(macsec->stats);
3978 return -ENOMEM;
3979 }
3980
3981 if (sci == MACSEC_UNDEF_SCI)
3982 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3983
3984 secy->netdev = dev;
3985 secy->operational = true;
3986 secy->key_len = DEFAULT_SAK_LEN;
3987 secy->icv_len = icv_len;
3988 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3989 secy->protect_frames = true;
3990 secy->replay_protect = false;
3991 secy->xpn = DEFAULT_XPN;
3992
3993 secy->sci = sci;
3994 secy->tx_sc.active = true;
3995 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3996 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3997 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3998 secy->tx_sc.end_station = false;
3999 secy->tx_sc.scb = false;
4000
4001 return 0;
4002}
4003
4004static struct lock_class_key macsec_netdev_addr_lock_key;
4005
4006static int macsec_newlink(struct net *net, struct net_device *dev,
4007 struct nlattr *tb[], struct nlattr *data[],
4008 struct netlink_ext_ack *extack)
4009{
4010 struct macsec_dev *macsec = macsec_priv(dev);
4011 rx_handler_func_t *rx_handler;
4012 u8 icv_len = DEFAULT_ICV_LEN;
4013 struct net_device *real_dev;
4014 int err, mtu;
4015 sci_t sci;
4016
4017 if (!tb[IFLA_LINK])
4018 return -EINVAL;
4019 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
4020 if (!real_dev)
4021 return -ENODEV;
4022 if (real_dev->type != ARPHRD_ETHER)
4023 return -EINVAL;
4024
4025 dev->priv_flags |= IFF_MACSEC;
4026
4027 macsec->real_dev = real_dev;
4028
4029 if (data && data[IFLA_MACSEC_OFFLOAD])
4030 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
4031 else
4032 /* MACsec offloading is off by default */
4033 macsec->offload = MACSEC_OFFLOAD_OFF;
4034
4035 /* Check if the offloading mode is supported by the underlying layers */
4036 if (macsec->offload != MACSEC_OFFLOAD_OFF &&
4037 !macsec_check_offload(macsec->offload, macsec))
4038 return -EOPNOTSUPP;
4039
4040 if (data && data[IFLA_MACSEC_ICV_LEN])
4041 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4042 mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
4043 if (mtu < 0)
4044 dev->mtu = 0;
4045 else
4046 dev->mtu = mtu;
4047
4048 rx_handler = rtnl_dereference(real_dev->rx_handler);
4049 if (rx_handler && rx_handler != macsec_handle_frame)
4050 return -EBUSY;
4051
4052 err = register_netdevice(dev);
4053 if (err < 0)
4054 return err;
4055
4056 netdev_lockdep_set_classes(dev);
4057 lockdep_set_class(&dev->addr_list_lock,
4058 &macsec_netdev_addr_lock_key);
4059
4060 err = netdev_upper_dev_link(real_dev, dev, extack);
4061 if (err < 0)
4062 goto unregister;
4063
4064 /* need to be already registered so that ->init has run and
4065 * the MAC addr is set
4066 */
4067 if (data && data[IFLA_MACSEC_SCI])
4068 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
4069 else if (data && data[IFLA_MACSEC_PORT])
4070 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
4071 else
4072 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4073
4074 if (rx_handler && sci_exists(real_dev, sci)) {
4075 err = -EBUSY;
4076 goto unlink;
4077 }
4078
4079 err = macsec_add_dev(dev, sci, icv_len);
4080 if (err)
4081 goto unlink;
4082
4083 if (data) {
4084 err = macsec_changelink_common(dev, data);
4085 if (err)
4086 goto del_dev;
4087 }
4088
4089 /* If h/w offloading is available, propagate to the device */
4090 if (macsec_is_offloaded(macsec)) {
4091 const struct macsec_ops *ops;
4092 struct macsec_context ctx;
4093
4094 ops = macsec_get_ops(macsec, &ctx);
4095 if (ops) {
4096 ctx.secy = &macsec->secy;
4097 err = macsec_offload(ops->mdo_add_secy, &ctx);
4098 if (err)
4099 goto del_dev;
4100 }
4101 }
4102
4103 err = register_macsec_dev(real_dev, dev);
4104 if (err < 0)
4105 goto del_dev;
4106
4107 netif_stacked_transfer_operstate(real_dev, dev);
4108 linkwatch_fire_event(dev);
4109
4110 macsec_generation++;
4111
4112 return 0;
4113
4114del_dev:
4115 macsec_del_dev(macsec);
4116unlink:
4117 netdev_upper_dev_unlink(real_dev, dev);
4118unregister:
4119 unregister_netdevice(dev);
4120 return err;
4121}
4122
4123static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
4124 struct netlink_ext_ack *extack)
4125{
4126 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
4127 u8 icv_len = DEFAULT_ICV_LEN;
4128 int flag;
4129 bool es, scb, sci;
4130
4131 if (!data)
4132 return 0;
4133
4134 if (data[IFLA_MACSEC_CIPHER_SUITE])
4135 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
4136
4137 if (data[IFLA_MACSEC_ICV_LEN]) {
4138 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4139 if (icv_len != DEFAULT_ICV_LEN) {
4140 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
4141 struct crypto_aead *dummy_tfm;
4142
4143 dummy_tfm = macsec_alloc_tfm(dummy_key,
4144 DEFAULT_SAK_LEN,
4145 icv_len);
4146 if (IS_ERR(dummy_tfm))
4147 return PTR_ERR(dummy_tfm);
4148 crypto_free_aead(dummy_tfm);
4149 }
4150 }
4151
4152 switch (csid) {
4153 case MACSEC_CIPHER_ID_GCM_AES_128:
4154 case MACSEC_CIPHER_ID_GCM_AES_256:
4155 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
4156 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
4157 case MACSEC_DEFAULT_CIPHER_ID:
4158 if (icv_len < MACSEC_MIN_ICV_LEN ||
4159 icv_len > MACSEC_STD_ICV_LEN)
4160 return -EINVAL;
4161 break;
4162 default:
4163 return -EINVAL;
4164 }
4165
4166 if (data[IFLA_MACSEC_ENCODING_SA]) {
4167 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
4168 return -EINVAL;
4169 }
4170
4171 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
4172 flag < IFLA_MACSEC_VALIDATION;
4173 flag++) {
4174 if (data[flag]) {
4175 if (nla_get_u8(data[flag]) > 1)
4176 return -EINVAL;
4177 }
4178 }
4179
4180 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
4181 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
4182 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
4183
4184 if ((sci && (scb || es)) || (scb && es))
4185 return -EINVAL;
4186
4187 if (data[IFLA_MACSEC_VALIDATION] &&
4188 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
4189 return -EINVAL;
4190
4191 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
4192 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
4193 !data[IFLA_MACSEC_WINDOW])
4194 return -EINVAL;
4195
4196 return 0;
4197}
4198
4199static struct net *macsec_get_link_net(const struct net_device *dev)
4200{
4201 return dev_net(macsec_priv(dev)->real_dev);
4202}
4203
4204static size_t macsec_get_size(const struct net_device *dev)
4205{
4206 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
4207 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
4208 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
4209 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
4210 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
4211 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
4212 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
4213 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
4214 nla_total_size(1) + /* IFLA_MACSEC_ES */
4215 nla_total_size(1) + /* IFLA_MACSEC_SCB */
4216 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
4217 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
4218 0;
4219}
4220
4221static int macsec_fill_info(struct sk_buff *skb,
4222 const struct net_device *dev)
4223{
4224 struct macsec_secy *secy = &macsec_priv(dev)->secy;
4225 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
4226 u64 csid;
4227
4228 switch (secy->key_len) {
4229 case MACSEC_GCM_AES_128_SAK_LEN:
4230 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
4231 break;
4232 case MACSEC_GCM_AES_256_SAK_LEN:
4233 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
4234 break;
4235 default:
4236 goto nla_put_failure;
4237 }
4238
4239 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
4240 IFLA_MACSEC_PAD) ||
4241 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
4242 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
4243 csid, IFLA_MACSEC_PAD) ||
4244 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
4245 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
4246 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
4247 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
4248 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
4249 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
4250 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
4251 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
4252 0)
4253 goto nla_put_failure;
4254
4255 if (secy->replay_protect) {
4256 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
4257 goto nla_put_failure;
4258 }
4259
4260 return 0;
4261
4262nla_put_failure:
4263 return -EMSGSIZE;
4264}
4265
4266static struct rtnl_link_ops macsec_link_ops __read_mostly = {
4267 .kind = "macsec",
4268 .priv_size = sizeof(struct macsec_dev),
4269 .maxtype = IFLA_MACSEC_MAX,
4270 .policy = macsec_rtnl_policy,
4271 .setup = macsec_setup,
4272 .validate = macsec_validate_attr,
4273 .newlink = macsec_newlink,
4274 .changelink = macsec_changelink,
4275 .dellink = macsec_dellink,
4276 .get_size = macsec_get_size,
4277 .fill_info = macsec_fill_info,
4278 .get_link_net = macsec_get_link_net,
4279};
4280
4281static bool is_macsec_master(struct net_device *dev)
4282{
4283 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
4284}
4285
4286static int macsec_notify(struct notifier_block *this, unsigned long event,
4287 void *ptr)
4288{
4289 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
4290 LIST_HEAD(head);
4291
4292 if (!is_macsec_master(real_dev))
4293 return NOTIFY_DONE;
4294
4295 switch (event) {
4296 case NETDEV_DOWN:
4297 case NETDEV_UP:
4298 case NETDEV_CHANGE: {
4299 struct macsec_dev *m, *n;
4300 struct macsec_rxh_data *rxd;
4301
4302 rxd = macsec_data_rtnl(real_dev);
4303 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4304 struct net_device *dev = m->secy.netdev;
4305
4306 netif_stacked_transfer_operstate(real_dev, dev);
4307 }
4308 break;
4309 }
4310 case NETDEV_UNREGISTER: {
4311 struct macsec_dev *m, *n;
4312 struct macsec_rxh_data *rxd;
4313
4314 rxd = macsec_data_rtnl(real_dev);
4315 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4316 macsec_common_dellink(m->secy.netdev, &head);
4317 }
4318
4319 netdev_rx_handler_unregister(real_dev);
4320 kfree(rxd);
4321
4322 unregister_netdevice_many(&head);
4323 break;
4324 }
4325 case NETDEV_CHANGEMTU: {
4326 struct macsec_dev *m;
4327 struct macsec_rxh_data *rxd;
4328
4329 rxd = macsec_data_rtnl(real_dev);
4330 list_for_each_entry(m, &rxd->secys, secys) {
4331 struct net_device *dev = m->secy.netdev;
4332 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
4333 macsec_extra_len(true));
4334
4335 if (dev->mtu > mtu)
4336 dev_set_mtu(dev, mtu);
4337 }
4338 }
4339 }
4340
4341 return NOTIFY_OK;
4342}
4343
4344static struct notifier_block macsec_notifier = {
4345 .notifier_call = macsec_notify,
4346};
4347
4348static int __init macsec_init(void)
4349{
4350 int err;
4351
4352 pr_info("MACsec IEEE 802.1AE\n");
4353 err = register_netdevice_notifier(&macsec_notifier);
4354 if (err)
4355 return err;
4356
4357 err = rtnl_link_register(&macsec_link_ops);
4358 if (err)
4359 goto notifier;
4360
4361 err = genl_register_family(&macsec_fam);
4362 if (err)
4363 goto rtnl;
4364
4365 return 0;
4366
4367rtnl:
4368 rtnl_link_unregister(&macsec_link_ops);
4369notifier:
4370 unregister_netdevice_notifier(&macsec_notifier);
4371 return err;
4372}
4373
4374static void __exit macsec_exit(void)
4375{
4376 genl_unregister_family(&macsec_fam);
4377 rtnl_link_unregister(&macsec_link_ops);
4378 unregister_netdevice_notifier(&macsec_notifier);
4379 rcu_barrier();
4380}
4381
4382module_init(macsec_init);
4383module_exit(macsec_exit);
4384
4385MODULE_ALIAS_RTNL_LINK("macsec");
4386MODULE_ALIAS_GENL_FAMILY("macsec");
4387
4388MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
4389MODULE_LICENSE("GPL v2");