Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * drivers/net/macsec.c - MACsec device
4 *
5 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
6 */
7
8#include <linux/types.h>
9#include <linux/skbuff.h>
10#include <linux/socket.h>
11#include <linux/module.h>
12#include <crypto/aead.h>
13#include <linux/etherdevice.h>
14#include <linux/netdevice.h>
15#include <linux/rtnetlink.h>
16#include <linux/refcount.h>
17#include <net/genetlink.h>
18#include <net/sock.h>
19#include <net/gro_cells.h>
20#include <net/macsec.h>
21#include <net/dst_metadata.h>
22#include <linux/phy.h>
23#include <linux/byteorder/generic.h>
24#include <linux/if_arp.h>
25
26#include <uapi/linux/if_macsec.h>
27
28/* SecTAG length = macsec_eth_header without the optional SCI */
29#define MACSEC_TAG_LEN 6
30
31struct macsec_eth_header {
32 struct ethhdr eth;
33 /* SecTAG */
34 u8 tci_an;
35#if defined(__LITTLE_ENDIAN_BITFIELD)
36 u8 short_length:6,
37 unused:2;
38#elif defined(__BIG_ENDIAN_BITFIELD)
39 u8 unused:2,
40 short_length:6;
41#else
42#error "Please fix <asm/byteorder.h>"
43#endif
44 __be32 packet_number;
45 u8 secure_channel_id[8]; /* optional */
46} __packed;
47
48/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
49#define MIN_NON_SHORT_LEN 48
50
51#define GCM_AES_IV_LEN 12
52
53#define for_each_rxsc(secy, sc) \
54 for (sc = rcu_dereference_bh(secy->rx_sc); \
55 sc; \
56 sc = rcu_dereference_bh(sc->next))
57#define for_each_rxsc_rtnl(secy, sc) \
58 for (sc = rtnl_dereference(secy->rx_sc); \
59 sc; \
60 sc = rtnl_dereference(sc->next))
61
62#define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31)))
63
64struct gcm_iv_xpn {
65 union {
66 u8 short_secure_channel_id[4];
67 ssci_t ssci;
68 };
69 __be64 pn;
70} __packed;
71
72struct gcm_iv {
73 union {
74 u8 secure_channel_id[8];
75 sci_t sci;
76 };
77 __be32 pn;
78};
79
80#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
81
82struct pcpu_secy_stats {
83 struct macsec_dev_stats stats;
84 struct u64_stats_sync syncp;
85};
86
87/**
88 * struct macsec_dev - private data
89 * @secy: SecY config
90 * @real_dev: pointer to underlying netdevice
91 * @dev_tracker: refcount tracker for @real_dev reference
92 * @stats: MACsec device stats
93 * @secys: linked list of SecY's on the underlying device
94 * @gro_cells: pointer to the Generic Receive Offload cell
95 * @offload: status of offloading on the MACsec device
96 * @insert_tx_tag: when offloading, device requires to insert an
97 * additional tag
98 */
99struct macsec_dev {
100 struct macsec_secy secy;
101 struct net_device *real_dev;
102 netdevice_tracker dev_tracker;
103 struct pcpu_secy_stats __percpu *stats;
104 struct list_head secys;
105 struct gro_cells gro_cells;
106 enum macsec_offload offload;
107 bool insert_tx_tag;
108};
109
110/**
111 * struct macsec_rxh_data - rx_handler private argument
112 * @secys: linked list of SecY's on this underlying device
113 */
114struct macsec_rxh_data {
115 struct list_head secys;
116};
117
118static struct macsec_dev *macsec_priv(const struct net_device *dev)
119{
120 return (struct macsec_dev *)netdev_priv(dev);
121}
122
123static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
124{
125 return rcu_dereference_bh(dev->rx_handler_data);
126}
127
128static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
129{
130 return rtnl_dereference(dev->rx_handler_data);
131}
132
133struct macsec_cb {
134 struct aead_request *req;
135 union {
136 struct macsec_tx_sa *tx_sa;
137 struct macsec_rx_sa *rx_sa;
138 };
139 u8 assoc_num;
140 bool valid;
141 bool has_sci;
142};
143
144static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
145{
146 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
147
148 if (!sa || !sa->active)
149 return NULL;
150
151 if (!refcount_inc_not_zero(&sa->refcnt))
152 return NULL;
153
154 return sa;
155}
156
157static struct macsec_rx_sa *macsec_active_rxsa_get(struct macsec_rx_sc *rx_sc)
158{
159 struct macsec_rx_sa *sa = NULL;
160 int an;
161
162 for (an = 0; an < MACSEC_NUM_AN; an++) {
163 sa = macsec_rxsa_get(rx_sc->sa[an]);
164 if (sa)
165 break;
166 }
167 return sa;
168}
169
170static void free_rx_sc_rcu(struct rcu_head *head)
171{
172 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
173
174 free_percpu(rx_sc->stats);
175 kfree(rx_sc);
176}
177
178static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
179{
180 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
181}
182
183static void macsec_rxsc_put(struct macsec_rx_sc *sc)
184{
185 if (refcount_dec_and_test(&sc->refcnt))
186 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
187}
188
189static void free_rxsa(struct rcu_head *head)
190{
191 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
192
193 crypto_free_aead(sa->key.tfm);
194 free_percpu(sa->stats);
195 kfree(sa);
196}
197
198static void macsec_rxsa_put(struct macsec_rx_sa *sa)
199{
200 if (refcount_dec_and_test(&sa->refcnt))
201 call_rcu(&sa->rcu, free_rxsa);
202}
203
204static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
205{
206 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
207
208 if (!sa || !sa->active)
209 return NULL;
210
211 if (!refcount_inc_not_zero(&sa->refcnt))
212 return NULL;
213
214 return sa;
215}
216
217static void free_txsa(struct rcu_head *head)
218{
219 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
220
221 crypto_free_aead(sa->key.tfm);
222 free_percpu(sa->stats);
223 kfree(sa);
224}
225
226static void macsec_txsa_put(struct macsec_tx_sa *sa)
227{
228 if (refcount_dec_and_test(&sa->refcnt))
229 call_rcu(&sa->rcu, free_txsa);
230}
231
232static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
233{
234 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
235 return (struct macsec_cb *)skb->cb;
236}
237
238#define MACSEC_PORT_SCB (0x0000)
239#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
240#define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
241
242#define MACSEC_GCM_AES_128_SAK_LEN 16
243#define MACSEC_GCM_AES_256_SAK_LEN 32
244
245#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
246#define DEFAULT_XPN false
247#define DEFAULT_SEND_SCI true
248#define DEFAULT_ENCRYPT false
249#define DEFAULT_ENCODING_SA 0
250#define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1))
251
252static sci_t make_sci(const u8 *addr, __be16 port)
253{
254 sci_t sci;
255
256 memcpy(&sci, addr, ETH_ALEN);
257 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
258
259 return sci;
260}
261
262static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
263{
264 sci_t sci;
265
266 if (sci_present)
267 memcpy(&sci, hdr->secure_channel_id,
268 sizeof(hdr->secure_channel_id));
269 else
270 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
271
272 return sci;
273}
274
275static unsigned int macsec_sectag_len(bool sci_present)
276{
277 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
278}
279
280static unsigned int macsec_hdr_len(bool sci_present)
281{
282 return macsec_sectag_len(sci_present) + ETH_HLEN;
283}
284
285static unsigned int macsec_extra_len(bool sci_present)
286{
287 return macsec_sectag_len(sci_present) + sizeof(__be16);
288}
289
290/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
291static void macsec_fill_sectag(struct macsec_eth_header *h,
292 const struct macsec_secy *secy, u32 pn,
293 bool sci_present)
294{
295 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
296
297 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
298 h->eth.h_proto = htons(ETH_P_MACSEC);
299
300 if (sci_present) {
301 h->tci_an |= MACSEC_TCI_SC;
302 memcpy(&h->secure_channel_id, &secy->sci,
303 sizeof(h->secure_channel_id));
304 } else {
305 if (tx_sc->end_station)
306 h->tci_an |= MACSEC_TCI_ES;
307 if (tx_sc->scb)
308 h->tci_an |= MACSEC_TCI_SCB;
309 }
310
311 h->packet_number = htonl(pn);
312
313 /* with GCM, C/E clear for !encrypt, both set for encrypt */
314 if (tx_sc->encrypt)
315 h->tci_an |= MACSEC_TCI_CONFID;
316 else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN)
317 h->tci_an |= MACSEC_TCI_C;
318
319 h->tci_an |= tx_sc->encoding_sa;
320}
321
322static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
323{
324 if (data_len < MIN_NON_SHORT_LEN)
325 h->short_length = data_len;
326}
327
328/* Checks if a MACsec interface is being offloaded to an hardware engine */
329static bool macsec_is_offloaded(struct macsec_dev *macsec)
330{
331 if (macsec->offload == MACSEC_OFFLOAD_MAC ||
332 macsec->offload == MACSEC_OFFLOAD_PHY)
333 return true;
334
335 return false;
336}
337
338/* Checks if underlying layers implement MACsec offloading functions. */
339static bool macsec_check_offload(enum macsec_offload offload,
340 struct macsec_dev *macsec)
341{
342 if (!macsec || !macsec->real_dev)
343 return false;
344
345 if (offload == MACSEC_OFFLOAD_PHY)
346 return macsec->real_dev->phydev &&
347 macsec->real_dev->phydev->macsec_ops;
348 else if (offload == MACSEC_OFFLOAD_MAC)
349 return macsec->real_dev->features & NETIF_F_HW_MACSEC &&
350 macsec->real_dev->macsec_ops;
351
352 return false;
353}
354
355static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload,
356 struct macsec_dev *macsec,
357 struct macsec_context *ctx)
358{
359 if (ctx) {
360 memset(ctx, 0, sizeof(*ctx));
361 ctx->offload = offload;
362
363 if (offload == MACSEC_OFFLOAD_PHY)
364 ctx->phydev = macsec->real_dev->phydev;
365 else if (offload == MACSEC_OFFLOAD_MAC)
366 ctx->netdev = macsec->real_dev;
367 }
368
369 if (offload == MACSEC_OFFLOAD_PHY)
370 return macsec->real_dev->phydev->macsec_ops;
371 else
372 return macsec->real_dev->macsec_ops;
373}
374
375/* Returns a pointer to the MACsec ops struct if any and updates the MACsec
376 * context device reference if provided.
377 */
378static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
379 struct macsec_context *ctx)
380{
381 if (!macsec_check_offload(macsec->offload, macsec))
382 return NULL;
383
384 return __macsec_get_ops(macsec->offload, macsec, ctx);
385}
386
387/* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */
388static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn)
389{
390 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
391 int len = skb->len - 2 * ETH_ALEN;
392 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
393
394 /* a) It comprises at least 17 octets */
395 if (skb->len <= 16)
396 return false;
397
398 /* b) MACsec EtherType: already checked */
399
400 /* c) V bit is clear */
401 if (h->tci_an & MACSEC_TCI_VERSION)
402 return false;
403
404 /* d) ES or SCB => !SC */
405 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
406 (h->tci_an & MACSEC_TCI_SC))
407 return false;
408
409 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
410 if (h->unused)
411 return false;
412
413 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */
414 if (!h->packet_number && !xpn)
415 return false;
416
417 /* length check, f) g) h) i) */
418 if (h->short_length)
419 return len == extra_len + h->short_length;
420 return len >= extra_len + MIN_NON_SHORT_LEN;
421}
422
423#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
424#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
425
426static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn,
427 salt_t salt)
428{
429 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv;
430
431 gcm_iv->ssci = ssci ^ salt.ssci;
432 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn;
433}
434
435static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
436{
437 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
438
439 gcm_iv->sci = sci;
440 gcm_iv->pn = htonl(pn);
441}
442
443static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
444{
445 return (struct macsec_eth_header *)skb_mac_header(skb);
446}
447
448static void __macsec_pn_wrapped(struct macsec_secy *secy,
449 struct macsec_tx_sa *tx_sa)
450{
451 pr_debug("PN wrapped, transitioning to !oper\n");
452 tx_sa->active = false;
453 if (secy->protect_frames)
454 secy->operational = false;
455}
456
457void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
458{
459 spin_lock_bh(&tx_sa->lock);
460 __macsec_pn_wrapped(secy, tx_sa);
461 spin_unlock_bh(&tx_sa->lock);
462}
463EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
464
465static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
466 struct macsec_secy *secy)
467{
468 pn_t pn;
469
470 spin_lock_bh(&tx_sa->lock);
471
472 pn = tx_sa->next_pn_halves;
473 if (secy->xpn)
474 tx_sa->next_pn++;
475 else
476 tx_sa->next_pn_halves.lower++;
477
478 if (tx_sa->next_pn == 0)
479 __macsec_pn_wrapped(secy, tx_sa);
480 spin_unlock_bh(&tx_sa->lock);
481
482 return pn;
483}
484
485static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
486{
487 struct macsec_dev *macsec = netdev_priv(dev);
488
489 skb->dev = macsec->real_dev;
490 skb_reset_mac_header(skb);
491 skb->protocol = eth_hdr(skb)->h_proto;
492}
493
494static unsigned int macsec_msdu_len(struct sk_buff *skb)
495{
496 struct macsec_dev *macsec = macsec_priv(skb->dev);
497 struct macsec_secy *secy = &macsec->secy;
498 bool sci_present = macsec_skb_cb(skb)->has_sci;
499
500 return skb->len - macsec_hdr_len(sci_present) - secy->icv_len;
501}
502
503static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
504 struct macsec_tx_sa *tx_sa)
505{
506 unsigned int msdu_len = macsec_msdu_len(skb);
507 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
508
509 u64_stats_update_begin(&txsc_stats->syncp);
510 if (tx_sc->encrypt) {
511 txsc_stats->stats.OutOctetsEncrypted += msdu_len;
512 txsc_stats->stats.OutPktsEncrypted++;
513 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
514 } else {
515 txsc_stats->stats.OutOctetsProtected += msdu_len;
516 txsc_stats->stats.OutPktsProtected++;
517 this_cpu_inc(tx_sa->stats->OutPktsProtected);
518 }
519 u64_stats_update_end(&txsc_stats->syncp);
520}
521
522static void count_tx(struct net_device *dev, int ret, int len)
523{
524 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN))
525 dev_sw_netstats_tx_add(dev, 1, len);
526}
527
528static void macsec_encrypt_done(void *data, int err)
529{
530 struct sk_buff *skb = data;
531 struct net_device *dev = skb->dev;
532 struct macsec_dev *macsec = macsec_priv(dev);
533 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
534 int len, ret;
535
536 aead_request_free(macsec_skb_cb(skb)->req);
537
538 rcu_read_lock_bh();
539 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
540 /* packet is encrypted/protected so tx_bytes must be calculated */
541 len = macsec_msdu_len(skb) + 2 * ETH_ALEN;
542 macsec_encrypt_finish(skb, dev);
543 ret = dev_queue_xmit(skb);
544 count_tx(dev, ret, len);
545 rcu_read_unlock_bh();
546
547 macsec_txsa_put(sa);
548 dev_put(dev);
549}
550
551static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
552 unsigned char **iv,
553 struct scatterlist **sg,
554 int num_frags)
555{
556 size_t size, iv_offset, sg_offset;
557 struct aead_request *req;
558 void *tmp;
559
560 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
561 iv_offset = size;
562 size += GCM_AES_IV_LEN;
563
564 size = ALIGN(size, __alignof__(struct scatterlist));
565 sg_offset = size;
566 size += sizeof(struct scatterlist) * num_frags;
567
568 tmp = kmalloc(size, GFP_ATOMIC);
569 if (!tmp)
570 return NULL;
571
572 *iv = (unsigned char *)(tmp + iv_offset);
573 *sg = (struct scatterlist *)(tmp + sg_offset);
574 req = tmp;
575
576 aead_request_set_tfm(req, tfm);
577
578 return req;
579}
580
581static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
582 struct net_device *dev)
583{
584 int ret;
585 struct scatterlist *sg;
586 struct sk_buff *trailer;
587 unsigned char *iv;
588 struct ethhdr *eth;
589 struct macsec_eth_header *hh;
590 size_t unprotected_len;
591 struct aead_request *req;
592 struct macsec_secy *secy;
593 struct macsec_tx_sc *tx_sc;
594 struct macsec_tx_sa *tx_sa;
595 struct macsec_dev *macsec = macsec_priv(dev);
596 bool sci_present;
597 pn_t pn;
598
599 secy = &macsec->secy;
600 tx_sc = &secy->tx_sc;
601
602 /* 10.5.1 TX SA assignment */
603 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
604 if (!tx_sa) {
605 secy->operational = false;
606 kfree_skb(skb);
607 return ERR_PTR(-EINVAL);
608 }
609
610 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
611 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
612 struct sk_buff *nskb = skb_copy_expand(skb,
613 MACSEC_NEEDED_HEADROOM,
614 MACSEC_NEEDED_TAILROOM,
615 GFP_ATOMIC);
616 if (likely(nskb)) {
617 consume_skb(skb);
618 skb = nskb;
619 } else {
620 macsec_txsa_put(tx_sa);
621 kfree_skb(skb);
622 return ERR_PTR(-ENOMEM);
623 }
624 } else {
625 skb = skb_unshare(skb, GFP_ATOMIC);
626 if (!skb) {
627 macsec_txsa_put(tx_sa);
628 return ERR_PTR(-ENOMEM);
629 }
630 }
631
632 unprotected_len = skb->len;
633 eth = eth_hdr(skb);
634 sci_present = macsec_send_sci(secy);
635 hh = skb_push(skb, macsec_extra_len(sci_present));
636 memmove(hh, eth, 2 * ETH_ALEN);
637
638 pn = tx_sa_update_pn(tx_sa, secy);
639 if (pn.full64 == 0) {
640 macsec_txsa_put(tx_sa);
641 kfree_skb(skb);
642 return ERR_PTR(-ENOLINK);
643 }
644 macsec_fill_sectag(hh, secy, pn.lower, sci_present);
645 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
646
647 skb_put(skb, secy->icv_len);
648
649 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
650 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
651
652 u64_stats_update_begin(&secy_stats->syncp);
653 secy_stats->stats.OutPktsTooLong++;
654 u64_stats_update_end(&secy_stats->syncp);
655
656 macsec_txsa_put(tx_sa);
657 kfree_skb(skb);
658 return ERR_PTR(-EINVAL);
659 }
660
661 ret = skb_cow_data(skb, 0, &trailer);
662 if (unlikely(ret < 0)) {
663 macsec_txsa_put(tx_sa);
664 kfree_skb(skb);
665 return ERR_PTR(ret);
666 }
667
668 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
669 if (!req) {
670 macsec_txsa_put(tx_sa);
671 kfree_skb(skb);
672 return ERR_PTR(-ENOMEM);
673 }
674
675 if (secy->xpn)
676 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt);
677 else
678 macsec_fill_iv(iv, secy->sci, pn.lower);
679
680 sg_init_table(sg, ret);
681 ret = skb_to_sgvec(skb, sg, 0, skb->len);
682 if (unlikely(ret < 0)) {
683 aead_request_free(req);
684 macsec_txsa_put(tx_sa);
685 kfree_skb(skb);
686 return ERR_PTR(ret);
687 }
688
689 if (tx_sc->encrypt) {
690 int len = skb->len - macsec_hdr_len(sci_present) -
691 secy->icv_len;
692 aead_request_set_crypt(req, sg, sg, len, iv);
693 aead_request_set_ad(req, macsec_hdr_len(sci_present));
694 } else {
695 aead_request_set_crypt(req, sg, sg, 0, iv);
696 aead_request_set_ad(req, skb->len - secy->icv_len);
697 }
698
699 macsec_skb_cb(skb)->req = req;
700 macsec_skb_cb(skb)->tx_sa = tx_sa;
701 macsec_skb_cb(skb)->has_sci = sci_present;
702 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
703
704 dev_hold(skb->dev);
705 ret = crypto_aead_encrypt(req);
706 if (ret == -EINPROGRESS) {
707 return ERR_PTR(ret);
708 } else if (ret != 0) {
709 dev_put(skb->dev);
710 kfree_skb(skb);
711 aead_request_free(req);
712 macsec_txsa_put(tx_sa);
713 return ERR_PTR(-EINVAL);
714 }
715
716 dev_put(skb->dev);
717 aead_request_free(req);
718 macsec_txsa_put(tx_sa);
719
720 return skb;
721}
722
723static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
724{
725 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
726 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
727 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
728 u32 lowest_pn = 0;
729
730 spin_lock(&rx_sa->lock);
731 if (rx_sa->next_pn_halves.lower >= secy->replay_window)
732 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
733
734 /* Now perform replay protection check again
735 * (see IEEE 802.1AE-2006 figure 10-5)
736 */
737 if (secy->replay_protect && pn < lowest_pn &&
738 (!secy->xpn || pn_same_half(pn, lowest_pn))) {
739 spin_unlock(&rx_sa->lock);
740 u64_stats_update_begin(&rxsc_stats->syncp);
741 rxsc_stats->stats.InPktsLate++;
742 u64_stats_update_end(&rxsc_stats->syncp);
743 DEV_STATS_INC(secy->netdev, rx_dropped);
744 return false;
745 }
746
747 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
748 unsigned int msdu_len = macsec_msdu_len(skb);
749 u64_stats_update_begin(&rxsc_stats->syncp);
750 if (hdr->tci_an & MACSEC_TCI_E)
751 rxsc_stats->stats.InOctetsDecrypted += msdu_len;
752 else
753 rxsc_stats->stats.InOctetsValidated += msdu_len;
754 u64_stats_update_end(&rxsc_stats->syncp);
755 }
756
757 if (!macsec_skb_cb(skb)->valid) {
758 spin_unlock(&rx_sa->lock);
759
760 /* 10.6.5 */
761 if (hdr->tci_an & MACSEC_TCI_C ||
762 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
763 u64_stats_update_begin(&rxsc_stats->syncp);
764 rxsc_stats->stats.InPktsNotValid++;
765 u64_stats_update_end(&rxsc_stats->syncp);
766 this_cpu_inc(rx_sa->stats->InPktsNotValid);
767 DEV_STATS_INC(secy->netdev, rx_errors);
768 return false;
769 }
770
771 u64_stats_update_begin(&rxsc_stats->syncp);
772 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
773 rxsc_stats->stats.InPktsInvalid++;
774 this_cpu_inc(rx_sa->stats->InPktsInvalid);
775 } else if (pn < lowest_pn) {
776 rxsc_stats->stats.InPktsDelayed++;
777 } else {
778 rxsc_stats->stats.InPktsUnchecked++;
779 }
780 u64_stats_update_end(&rxsc_stats->syncp);
781 } else {
782 u64_stats_update_begin(&rxsc_stats->syncp);
783 if (pn < lowest_pn) {
784 rxsc_stats->stats.InPktsDelayed++;
785 } else {
786 rxsc_stats->stats.InPktsOK++;
787 this_cpu_inc(rx_sa->stats->InPktsOK);
788 }
789 u64_stats_update_end(&rxsc_stats->syncp);
790
791 // Instead of "pn >=" - to support pn overflow in xpn
792 if (pn + 1 > rx_sa->next_pn_halves.lower) {
793 rx_sa->next_pn_halves.lower = pn + 1;
794 } else if (secy->xpn &&
795 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
796 rx_sa->next_pn_halves.upper++;
797 rx_sa->next_pn_halves.lower = pn + 1;
798 }
799
800 spin_unlock(&rx_sa->lock);
801 }
802
803 return true;
804}
805
806static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
807{
808 skb->pkt_type = PACKET_HOST;
809 skb->protocol = eth_type_trans(skb, dev);
810
811 skb_reset_network_header(skb);
812 if (!skb_transport_header_was_set(skb))
813 skb_reset_transport_header(skb);
814 skb_reset_mac_len(skb);
815}
816
817static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
818{
819 skb->ip_summed = CHECKSUM_NONE;
820 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
821 skb_pull(skb, hdr_len);
822 pskb_trim_unique(skb, skb->len - icv_len);
823}
824
825static void count_rx(struct net_device *dev, int len)
826{
827 dev_sw_netstats_rx_add(dev, len);
828}
829
830static void macsec_decrypt_done(void *data, int err)
831{
832 struct sk_buff *skb = data;
833 struct net_device *dev = skb->dev;
834 struct macsec_dev *macsec = macsec_priv(dev);
835 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
836 struct macsec_rx_sc *rx_sc = rx_sa->sc;
837 int len;
838 u32 pn;
839
840 aead_request_free(macsec_skb_cb(skb)->req);
841
842 if (!err)
843 macsec_skb_cb(skb)->valid = true;
844
845 rcu_read_lock_bh();
846 pn = ntohl(macsec_ethhdr(skb)->packet_number);
847 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
848 rcu_read_unlock_bh();
849 kfree_skb(skb);
850 goto out;
851 }
852
853 macsec_finalize_skb(skb, macsec->secy.icv_len,
854 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
855 len = skb->len;
856 macsec_reset_skb(skb, macsec->secy.netdev);
857
858 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
859 count_rx(dev, len);
860
861 rcu_read_unlock_bh();
862
863out:
864 macsec_rxsa_put(rx_sa);
865 macsec_rxsc_put(rx_sc);
866 dev_put(dev);
867}
868
869static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
870 struct net_device *dev,
871 struct macsec_rx_sa *rx_sa,
872 sci_t sci,
873 struct macsec_secy *secy)
874{
875 int ret;
876 struct scatterlist *sg;
877 struct sk_buff *trailer;
878 unsigned char *iv;
879 struct aead_request *req;
880 struct macsec_eth_header *hdr;
881 u32 hdr_pn;
882 u16 icv_len = secy->icv_len;
883
884 macsec_skb_cb(skb)->valid = false;
885 skb = skb_share_check(skb, GFP_ATOMIC);
886 if (!skb)
887 return ERR_PTR(-ENOMEM);
888
889 ret = skb_cow_data(skb, 0, &trailer);
890 if (unlikely(ret < 0)) {
891 kfree_skb(skb);
892 return ERR_PTR(ret);
893 }
894 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
895 if (!req) {
896 kfree_skb(skb);
897 return ERR_PTR(-ENOMEM);
898 }
899
900 hdr = (struct macsec_eth_header *)skb->data;
901 hdr_pn = ntohl(hdr->packet_number);
902
903 if (secy->xpn) {
904 pn_t recovered_pn = rx_sa->next_pn_halves;
905
906 recovered_pn.lower = hdr_pn;
907 if (hdr_pn < rx_sa->next_pn_halves.lower &&
908 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
909 recovered_pn.upper++;
910
911 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
912 rx_sa->key.salt);
913 } else {
914 macsec_fill_iv(iv, sci, hdr_pn);
915 }
916
917 sg_init_table(sg, ret);
918 ret = skb_to_sgvec(skb, sg, 0, skb->len);
919 if (unlikely(ret < 0)) {
920 aead_request_free(req);
921 kfree_skb(skb);
922 return ERR_PTR(ret);
923 }
924
925 if (hdr->tci_an & MACSEC_TCI_E) {
926 /* confidentiality: ethernet + macsec header
927 * authenticated, encrypted payload
928 */
929 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
930
931 aead_request_set_crypt(req, sg, sg, len, iv);
932 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
933 skb = skb_unshare(skb, GFP_ATOMIC);
934 if (!skb) {
935 aead_request_free(req);
936 return ERR_PTR(-ENOMEM);
937 }
938 } else {
939 /* integrity only: all headers + data authenticated */
940 aead_request_set_crypt(req, sg, sg, icv_len, iv);
941 aead_request_set_ad(req, skb->len - icv_len);
942 }
943
944 macsec_skb_cb(skb)->req = req;
945 skb->dev = dev;
946 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
947
948 dev_hold(dev);
949 ret = crypto_aead_decrypt(req);
950 if (ret == -EINPROGRESS) {
951 return ERR_PTR(ret);
952 } else if (ret != 0) {
953 /* decryption/authentication failed
954 * 10.6 if validateFrames is disabled, deliver anyway
955 */
956 if (ret != -EBADMSG) {
957 kfree_skb(skb);
958 skb = ERR_PTR(ret);
959 }
960 } else {
961 macsec_skb_cb(skb)->valid = true;
962 }
963 dev_put(dev);
964
965 aead_request_free(req);
966
967 return skb;
968}
969
970static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
971{
972 struct macsec_rx_sc *rx_sc;
973
974 for_each_rxsc(secy, rx_sc) {
975 if (rx_sc->sci == sci)
976 return rx_sc;
977 }
978
979 return NULL;
980}
981
982static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
983{
984 struct macsec_rx_sc *rx_sc;
985
986 for_each_rxsc_rtnl(secy, rx_sc) {
987 if (rx_sc->sci == sci)
988 return rx_sc;
989 }
990
991 return NULL;
992}
993
994static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
995{
996 /* Deliver to the uncontrolled port by default */
997 enum rx_handler_result ret = RX_HANDLER_PASS;
998 struct ethhdr *hdr = eth_hdr(skb);
999 struct metadata_dst *md_dst;
1000 struct macsec_rxh_data *rxd;
1001 struct macsec_dev *macsec;
1002 bool is_macsec_md_dst;
1003
1004 rcu_read_lock();
1005 rxd = macsec_data_rcu(skb->dev);
1006 md_dst = skb_metadata_dst(skb);
1007 is_macsec_md_dst = md_dst && md_dst->type == METADATA_MACSEC;
1008
1009 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1010 struct sk_buff *nskb;
1011 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1012 struct net_device *ndev = macsec->secy.netdev;
1013
1014 /* If h/w offloading is enabled, HW decodes frames and strips
1015 * the SecTAG, so we have to deduce which port to deliver to.
1016 */
1017 if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
1018 const struct macsec_ops *ops;
1019
1020 ops = macsec_get_ops(macsec, NULL);
1021
1022 if (ops->rx_uses_md_dst && !is_macsec_md_dst)
1023 continue;
1024
1025 if (is_macsec_md_dst) {
1026 struct macsec_rx_sc *rx_sc;
1027
1028 /* All drivers that implement MACsec offload
1029 * support using skb metadata destinations must
1030 * indicate that they do so.
1031 */
1032 DEBUG_NET_WARN_ON_ONCE(!ops->rx_uses_md_dst);
1033 rx_sc = find_rx_sc(&macsec->secy,
1034 md_dst->u.macsec_info.sci);
1035 if (!rx_sc)
1036 continue;
1037 /* device indicated macsec offload occurred */
1038 skb->dev = ndev;
1039 skb->pkt_type = PACKET_HOST;
1040 eth_skb_pkt_type(skb, ndev);
1041 ret = RX_HANDLER_ANOTHER;
1042 goto out;
1043 }
1044
1045 /* This datapath is insecure because it is unable to
1046 * enforce isolation of broadcast/multicast traffic and
1047 * unicast traffic with promiscuous mode on the macsec
1048 * netdev. Since the core stack has no mechanism to
1049 * check that the hardware did indeed receive MACsec
1050 * traffic, it is possible that the response handling
1051 * done by the MACsec port was to a plaintext packet.
1052 * This violates the MACsec protocol standard.
1053 */
1054 if (ether_addr_equal_64bits(hdr->h_dest,
1055 ndev->dev_addr)) {
1056 /* exact match, divert skb to this port */
1057 skb->dev = ndev;
1058 skb->pkt_type = PACKET_HOST;
1059 ret = RX_HANDLER_ANOTHER;
1060 goto out;
1061 } else if (is_multicast_ether_addr_64bits(
1062 hdr->h_dest)) {
1063 /* multicast frame, deliver on this port too */
1064 nskb = skb_clone(skb, GFP_ATOMIC);
1065 if (!nskb)
1066 break;
1067
1068 nskb->dev = ndev;
1069 eth_skb_pkt_type(nskb, ndev);
1070
1071 __netif_rx(nskb);
1072 } else if (ndev->flags & IFF_PROMISC) {
1073 skb->dev = ndev;
1074 skb->pkt_type = PACKET_HOST;
1075 ret = RX_HANDLER_ANOTHER;
1076 goto out;
1077 }
1078
1079 continue;
1080 }
1081
1082 /* 10.6 If the management control validateFrames is not
1083 * Strict, frames without a SecTAG are received, counted, and
1084 * delivered to the Controlled Port
1085 */
1086 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1087 u64_stats_update_begin(&secy_stats->syncp);
1088 secy_stats->stats.InPktsNoTag++;
1089 u64_stats_update_end(&secy_stats->syncp);
1090 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1091 continue;
1092 }
1093
1094 /* deliver on this port */
1095 nskb = skb_clone(skb, GFP_ATOMIC);
1096 if (!nskb)
1097 break;
1098
1099 nskb->dev = ndev;
1100
1101 if (__netif_rx(nskb) == NET_RX_SUCCESS) {
1102 u64_stats_update_begin(&secy_stats->syncp);
1103 secy_stats->stats.InPktsUntagged++;
1104 u64_stats_update_end(&secy_stats->syncp);
1105 }
1106 }
1107
1108out:
1109 rcu_read_unlock();
1110 return ret;
1111}
1112
1113static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1114{
1115 struct sk_buff *skb = *pskb;
1116 struct net_device *dev = skb->dev;
1117 struct macsec_eth_header *hdr;
1118 struct macsec_secy *secy = NULL;
1119 struct macsec_rx_sc *rx_sc;
1120 struct macsec_rx_sa *rx_sa;
1121 struct macsec_rxh_data *rxd;
1122 struct macsec_dev *macsec;
1123 unsigned int len;
1124 sci_t sci;
1125 u32 hdr_pn;
1126 bool cbit;
1127 struct pcpu_rx_sc_stats *rxsc_stats;
1128 struct pcpu_secy_stats *secy_stats;
1129 bool pulled_sci;
1130 int ret;
1131
1132 if (skb_headroom(skb) < ETH_HLEN)
1133 goto drop_direct;
1134
1135 hdr = macsec_ethhdr(skb);
1136 if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
1137 return handle_not_macsec(skb);
1138
1139 skb = skb_unshare(skb, GFP_ATOMIC);
1140 *pskb = skb;
1141 if (!skb)
1142 return RX_HANDLER_CONSUMED;
1143
1144 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1145 if (!pulled_sci) {
1146 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1147 goto drop_direct;
1148 }
1149
1150 hdr = macsec_ethhdr(skb);
1151
1152 /* Frames with a SecTAG that has the TCI E bit set but the C
1153 * bit clear are discarded, as this reserved encoding is used
1154 * to identify frames with a SecTAG that are not to be
1155 * delivered to the Controlled Port.
1156 */
1157 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1158 return RX_HANDLER_PASS;
1159
1160 /* now, pull the extra length */
1161 if (hdr->tci_an & MACSEC_TCI_SC) {
1162 if (!pulled_sci)
1163 goto drop_direct;
1164 }
1165
1166 /* ethernet header is part of crypto processing */
1167 skb_push(skb, ETH_HLEN);
1168
1169 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1170 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1171 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1172
1173 rcu_read_lock();
1174 rxd = macsec_data_rcu(skb->dev);
1175
1176 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1177 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1178
1179 sc = sc ? macsec_rxsc_get(sc) : NULL;
1180
1181 if (sc) {
1182 secy = &macsec->secy;
1183 rx_sc = sc;
1184 break;
1185 }
1186 }
1187
1188 if (!secy)
1189 goto nosci;
1190
1191 dev = secy->netdev;
1192 macsec = macsec_priv(dev);
1193 secy_stats = this_cpu_ptr(macsec->stats);
1194 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1195
1196 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
1197 u64_stats_update_begin(&secy_stats->syncp);
1198 secy_stats->stats.InPktsBadTag++;
1199 u64_stats_update_end(&secy_stats->syncp);
1200 DEV_STATS_INC(secy->netdev, rx_errors);
1201 goto drop_nosa;
1202 }
1203
1204 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1205 if (!rx_sa) {
1206 /* 10.6.1 if the SA is not in use */
1207
1208 /* If validateFrames is Strict or the C bit in the
1209 * SecTAG is set, discard
1210 */
1211 struct macsec_rx_sa *active_rx_sa = macsec_active_rxsa_get(rx_sc);
1212 if (hdr->tci_an & MACSEC_TCI_C ||
1213 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1214 u64_stats_update_begin(&rxsc_stats->syncp);
1215 rxsc_stats->stats.InPktsNotUsingSA++;
1216 u64_stats_update_end(&rxsc_stats->syncp);
1217 DEV_STATS_INC(secy->netdev, rx_errors);
1218 if (active_rx_sa)
1219 this_cpu_inc(active_rx_sa->stats->InPktsNotUsingSA);
1220 goto drop_nosa;
1221 }
1222
1223 /* not Strict, the frame (with the SecTAG and ICV
1224 * removed) is delivered to the Controlled Port.
1225 */
1226 u64_stats_update_begin(&rxsc_stats->syncp);
1227 rxsc_stats->stats.InPktsUnusedSA++;
1228 u64_stats_update_end(&rxsc_stats->syncp);
1229 if (active_rx_sa)
1230 this_cpu_inc(active_rx_sa->stats->InPktsUnusedSA);
1231 goto deliver;
1232 }
1233
1234 /* First, PN check to avoid decrypting obviously wrong packets */
1235 hdr_pn = ntohl(hdr->packet_number);
1236 if (secy->replay_protect) {
1237 bool late;
1238
1239 spin_lock(&rx_sa->lock);
1240 late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
1241 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
1242
1243 if (secy->xpn)
1244 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
1245 spin_unlock(&rx_sa->lock);
1246
1247 if (late) {
1248 u64_stats_update_begin(&rxsc_stats->syncp);
1249 rxsc_stats->stats.InPktsLate++;
1250 u64_stats_update_end(&rxsc_stats->syncp);
1251 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1252 goto drop;
1253 }
1254 }
1255
1256 macsec_skb_cb(skb)->rx_sa = rx_sa;
1257
1258 /* Disabled && !changed text => skip validation */
1259 if (hdr->tci_an & MACSEC_TCI_C ||
1260 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1261 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1262
1263 if (IS_ERR(skb)) {
1264 /* the decrypt callback needs the reference */
1265 if (PTR_ERR(skb) != -EINPROGRESS) {
1266 macsec_rxsa_put(rx_sa);
1267 macsec_rxsc_put(rx_sc);
1268 }
1269 rcu_read_unlock();
1270 *pskb = NULL;
1271 return RX_HANDLER_CONSUMED;
1272 }
1273
1274 if (!macsec_post_decrypt(skb, secy, hdr_pn))
1275 goto drop;
1276
1277deliver:
1278 macsec_finalize_skb(skb, secy->icv_len,
1279 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1280 len = skb->len;
1281 macsec_reset_skb(skb, secy->netdev);
1282
1283 if (rx_sa)
1284 macsec_rxsa_put(rx_sa);
1285 macsec_rxsc_put(rx_sc);
1286
1287 skb_orphan(skb);
1288 ret = gro_cells_receive(&macsec->gro_cells, skb);
1289 if (ret == NET_RX_SUCCESS)
1290 count_rx(dev, len);
1291 else
1292 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1293
1294 rcu_read_unlock();
1295
1296 *pskb = NULL;
1297 return RX_HANDLER_CONSUMED;
1298
1299drop:
1300 macsec_rxsa_put(rx_sa);
1301drop_nosa:
1302 macsec_rxsc_put(rx_sc);
1303 rcu_read_unlock();
1304drop_direct:
1305 kfree_skb(skb);
1306 *pskb = NULL;
1307 return RX_HANDLER_CONSUMED;
1308
1309nosci:
1310 /* 10.6.1 if the SC is not found */
1311 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1312 if (!cbit)
1313 macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN,
1314 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1315
1316 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1317 struct sk_buff *nskb;
1318
1319 secy_stats = this_cpu_ptr(macsec->stats);
1320
1321 /* If validateFrames is Strict or the C bit in the
1322 * SecTAG is set, discard
1323 */
1324 if (cbit ||
1325 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1326 u64_stats_update_begin(&secy_stats->syncp);
1327 secy_stats->stats.InPktsNoSCI++;
1328 u64_stats_update_end(&secy_stats->syncp);
1329 DEV_STATS_INC(macsec->secy.netdev, rx_errors);
1330 continue;
1331 }
1332
1333 /* not strict, the frame (with the SecTAG and ICV
1334 * removed) is delivered to the Controlled Port.
1335 */
1336 nskb = skb_clone(skb, GFP_ATOMIC);
1337 if (!nskb)
1338 break;
1339
1340 macsec_reset_skb(nskb, macsec->secy.netdev);
1341
1342 ret = __netif_rx(nskb);
1343 if (ret == NET_RX_SUCCESS) {
1344 u64_stats_update_begin(&secy_stats->syncp);
1345 secy_stats->stats.InPktsUnknownSCI++;
1346 u64_stats_update_end(&secy_stats->syncp);
1347 } else {
1348 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1349 }
1350 }
1351
1352 rcu_read_unlock();
1353 *pskb = skb;
1354 return RX_HANDLER_PASS;
1355}
1356
1357static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1358{
1359 struct crypto_aead *tfm;
1360 int ret;
1361
1362 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1363
1364 if (IS_ERR(tfm))
1365 return tfm;
1366
1367 ret = crypto_aead_setkey(tfm, key, key_len);
1368 if (ret < 0)
1369 goto fail;
1370
1371 ret = crypto_aead_setauthsize(tfm, icv_len);
1372 if (ret < 0)
1373 goto fail;
1374
1375 return tfm;
1376fail:
1377 crypto_free_aead(tfm);
1378 return ERR_PTR(ret);
1379}
1380
1381static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1382 int icv_len)
1383{
1384 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1385 if (!rx_sa->stats)
1386 return -ENOMEM;
1387
1388 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1389 if (IS_ERR(rx_sa->key.tfm)) {
1390 free_percpu(rx_sa->stats);
1391 return PTR_ERR(rx_sa->key.tfm);
1392 }
1393
1394 rx_sa->ssci = MACSEC_UNDEF_SSCI;
1395 rx_sa->active = false;
1396 rx_sa->next_pn = 1;
1397 refcount_set(&rx_sa->refcnt, 1);
1398 spin_lock_init(&rx_sa->lock);
1399
1400 return 0;
1401}
1402
1403static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1404{
1405 rx_sa->active = false;
1406
1407 macsec_rxsa_put(rx_sa);
1408}
1409
1410static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1411{
1412 int i;
1413
1414 for (i = 0; i < MACSEC_NUM_AN; i++) {
1415 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1416
1417 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1418 if (sa)
1419 clear_rx_sa(sa);
1420 }
1421
1422 macsec_rxsc_put(rx_sc);
1423}
1424
1425static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1426{
1427 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1428
1429 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1430 rx_sc;
1431 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1432 if (rx_sc->sci == sci) {
1433 if (rx_sc->active)
1434 secy->n_rx_sc--;
1435 rcu_assign_pointer(*rx_scp, rx_sc->next);
1436 return rx_sc;
1437 }
1438 }
1439
1440 return NULL;
1441}
1442
1443static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci,
1444 bool active)
1445{
1446 struct macsec_rx_sc *rx_sc;
1447 struct macsec_dev *macsec;
1448 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1449 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1450 struct macsec_secy *secy;
1451
1452 list_for_each_entry(macsec, &rxd->secys, secys) {
1453 if (find_rx_sc_rtnl(&macsec->secy, sci))
1454 return ERR_PTR(-EEXIST);
1455 }
1456
1457 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1458 if (!rx_sc)
1459 return ERR_PTR(-ENOMEM);
1460
1461 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1462 if (!rx_sc->stats) {
1463 kfree(rx_sc);
1464 return ERR_PTR(-ENOMEM);
1465 }
1466
1467 rx_sc->sci = sci;
1468 rx_sc->active = active;
1469 refcount_set(&rx_sc->refcnt, 1);
1470
1471 secy = &macsec_priv(dev)->secy;
1472 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1473 rcu_assign_pointer(secy->rx_sc, rx_sc);
1474
1475 if (rx_sc->active)
1476 secy->n_rx_sc++;
1477
1478 return rx_sc;
1479}
1480
1481static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1482 int icv_len)
1483{
1484 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1485 if (!tx_sa->stats)
1486 return -ENOMEM;
1487
1488 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1489 if (IS_ERR(tx_sa->key.tfm)) {
1490 free_percpu(tx_sa->stats);
1491 return PTR_ERR(tx_sa->key.tfm);
1492 }
1493
1494 tx_sa->ssci = MACSEC_UNDEF_SSCI;
1495 tx_sa->active = false;
1496 refcount_set(&tx_sa->refcnt, 1);
1497 spin_lock_init(&tx_sa->lock);
1498
1499 return 0;
1500}
1501
1502static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1503{
1504 tx_sa->active = false;
1505
1506 macsec_txsa_put(tx_sa);
1507}
1508
1509static struct genl_family macsec_fam;
1510
1511static struct net_device *get_dev_from_nl(struct net *net,
1512 struct nlattr **attrs)
1513{
1514 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1515 struct net_device *dev;
1516
1517 dev = __dev_get_by_index(net, ifindex);
1518 if (!dev)
1519 return ERR_PTR(-ENODEV);
1520
1521 if (!netif_is_macsec(dev))
1522 return ERR_PTR(-ENODEV);
1523
1524 return dev;
1525}
1526
1527static enum macsec_offload nla_get_offload(const struct nlattr *nla)
1528{
1529 return (__force enum macsec_offload)nla_get_u8(nla);
1530}
1531
1532static sci_t nla_get_sci(const struct nlattr *nla)
1533{
1534 return (__force sci_t)nla_get_u64(nla);
1535}
1536
1537static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1538 int padattr)
1539{
1540 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1541}
1542
1543static ssci_t nla_get_ssci(const struct nlattr *nla)
1544{
1545 return (__force ssci_t)nla_get_u32(nla);
1546}
1547
1548static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
1549{
1550 return nla_put_u32(skb, attrtype, (__force u64)value);
1551}
1552
1553static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1554 struct nlattr **attrs,
1555 struct nlattr **tb_sa,
1556 struct net_device **devp,
1557 struct macsec_secy **secyp,
1558 struct macsec_tx_sc **scp,
1559 u8 *assoc_num)
1560{
1561 struct net_device *dev;
1562 struct macsec_secy *secy;
1563 struct macsec_tx_sc *tx_sc;
1564 struct macsec_tx_sa *tx_sa;
1565
1566 if (!tb_sa[MACSEC_SA_ATTR_AN])
1567 return ERR_PTR(-EINVAL);
1568
1569 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1570
1571 dev = get_dev_from_nl(net, attrs);
1572 if (IS_ERR(dev))
1573 return ERR_CAST(dev);
1574
1575 if (*assoc_num >= MACSEC_NUM_AN)
1576 return ERR_PTR(-EINVAL);
1577
1578 secy = &macsec_priv(dev)->secy;
1579 tx_sc = &secy->tx_sc;
1580
1581 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1582 if (!tx_sa)
1583 return ERR_PTR(-ENODEV);
1584
1585 *devp = dev;
1586 *scp = tx_sc;
1587 *secyp = secy;
1588 return tx_sa;
1589}
1590
1591static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1592 struct nlattr **attrs,
1593 struct nlattr **tb_rxsc,
1594 struct net_device **devp,
1595 struct macsec_secy **secyp)
1596{
1597 struct net_device *dev;
1598 struct macsec_secy *secy;
1599 struct macsec_rx_sc *rx_sc;
1600 sci_t sci;
1601
1602 dev = get_dev_from_nl(net, attrs);
1603 if (IS_ERR(dev))
1604 return ERR_CAST(dev);
1605
1606 secy = &macsec_priv(dev)->secy;
1607
1608 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1609 return ERR_PTR(-EINVAL);
1610
1611 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1612 rx_sc = find_rx_sc_rtnl(secy, sci);
1613 if (!rx_sc)
1614 return ERR_PTR(-ENODEV);
1615
1616 *secyp = secy;
1617 *devp = dev;
1618
1619 return rx_sc;
1620}
1621
1622static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1623 struct nlattr **attrs,
1624 struct nlattr **tb_rxsc,
1625 struct nlattr **tb_sa,
1626 struct net_device **devp,
1627 struct macsec_secy **secyp,
1628 struct macsec_rx_sc **scp,
1629 u8 *assoc_num)
1630{
1631 struct macsec_rx_sc *rx_sc;
1632 struct macsec_rx_sa *rx_sa;
1633
1634 if (!tb_sa[MACSEC_SA_ATTR_AN])
1635 return ERR_PTR(-EINVAL);
1636
1637 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1638 if (*assoc_num >= MACSEC_NUM_AN)
1639 return ERR_PTR(-EINVAL);
1640
1641 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1642 if (IS_ERR(rx_sc))
1643 return ERR_CAST(rx_sc);
1644
1645 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1646 if (!rx_sa)
1647 return ERR_PTR(-ENODEV);
1648
1649 *scp = rx_sc;
1650 return rx_sa;
1651}
1652
1653static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1654 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1655 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1656 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1657 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1658};
1659
1660static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1661 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1662 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1663};
1664
1665static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1666 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1667 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1668 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4),
1669 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1670 .len = MACSEC_KEYID_LEN, },
1671 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1672 .len = MACSEC_MAX_KEY_LEN, },
1673 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
1674 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
1675 .len = MACSEC_SALT_LEN, },
1676};
1677
1678static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
1679 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
1680};
1681
1682/* Offloads an operation to a device driver */
1683static int macsec_offload(int (* const func)(struct macsec_context *),
1684 struct macsec_context *ctx)
1685{
1686 int ret;
1687
1688 if (unlikely(!func))
1689 return 0;
1690
1691 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1692 mutex_lock(&ctx->phydev->lock);
1693
1694 ret = (*func)(ctx);
1695
1696 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1697 mutex_unlock(&ctx->phydev->lock);
1698
1699 return ret;
1700}
1701
1702static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1703{
1704 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1705 return -EINVAL;
1706
1707 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1708 return -EINVAL;
1709
1710 return 0;
1711}
1712
1713static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1714{
1715 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1716 return -EINVAL;
1717
1718 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1719 return -EINVAL;
1720
1721 return 0;
1722}
1723
1724static bool validate_add_rxsa(struct nlattr **attrs)
1725{
1726 if (!attrs[MACSEC_SA_ATTR_AN] ||
1727 !attrs[MACSEC_SA_ATTR_KEY] ||
1728 !attrs[MACSEC_SA_ATTR_KEYID])
1729 return false;
1730
1731 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1732 return false;
1733
1734 if (attrs[MACSEC_SA_ATTR_PN] &&
1735 nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1736 return false;
1737
1738 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1739 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1740 return false;
1741 }
1742
1743 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1744 return false;
1745
1746 return true;
1747}
1748
1749static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1750{
1751 struct net_device *dev;
1752 struct nlattr **attrs = info->attrs;
1753 struct macsec_secy *secy;
1754 struct macsec_rx_sc *rx_sc;
1755 struct macsec_rx_sa *rx_sa;
1756 unsigned char assoc_num;
1757 int pn_len;
1758 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1759 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1760 int err;
1761
1762 if (!attrs[MACSEC_ATTR_IFINDEX])
1763 return -EINVAL;
1764
1765 if (parse_sa_config(attrs, tb_sa))
1766 return -EINVAL;
1767
1768 if (parse_rxsc_config(attrs, tb_rxsc))
1769 return -EINVAL;
1770
1771 if (!validate_add_rxsa(tb_sa))
1772 return -EINVAL;
1773
1774 rtnl_lock();
1775 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1776 if (IS_ERR(rx_sc)) {
1777 rtnl_unlock();
1778 return PTR_ERR(rx_sc);
1779 }
1780
1781 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1782
1783 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1784 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1785 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1786 rtnl_unlock();
1787 return -EINVAL;
1788 }
1789
1790 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1791 if (tb_sa[MACSEC_SA_ATTR_PN] &&
1792 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1793 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
1794 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1795 rtnl_unlock();
1796 return -EINVAL;
1797 }
1798
1799 if (secy->xpn) {
1800 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
1801 rtnl_unlock();
1802 return -EINVAL;
1803 }
1804
1805 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
1806 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
1807 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
1808 MACSEC_SALT_LEN);
1809 rtnl_unlock();
1810 return -EINVAL;
1811 }
1812 }
1813
1814 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1815 if (rx_sa) {
1816 rtnl_unlock();
1817 return -EBUSY;
1818 }
1819
1820 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1821 if (!rx_sa) {
1822 rtnl_unlock();
1823 return -ENOMEM;
1824 }
1825
1826 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1827 secy->key_len, secy->icv_len);
1828 if (err < 0) {
1829 kfree(rx_sa);
1830 rtnl_unlock();
1831 return err;
1832 }
1833
1834 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1835 spin_lock_bh(&rx_sa->lock);
1836 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
1837 spin_unlock_bh(&rx_sa->lock);
1838 }
1839
1840 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1841 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1842
1843 rx_sa->sc = rx_sc;
1844
1845 if (secy->xpn) {
1846 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
1847 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
1848 MACSEC_SALT_LEN);
1849 }
1850
1851 /* If h/w offloading is available, propagate to the device */
1852 if (macsec_is_offloaded(netdev_priv(dev))) {
1853 const struct macsec_ops *ops;
1854 struct macsec_context ctx;
1855
1856 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1857 if (!ops) {
1858 err = -EOPNOTSUPP;
1859 goto cleanup;
1860 }
1861
1862 ctx.sa.assoc_num = assoc_num;
1863 ctx.sa.rx_sa = rx_sa;
1864 ctx.secy = secy;
1865 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1866 secy->key_len);
1867
1868 err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1869 memzero_explicit(ctx.sa.key, secy->key_len);
1870 if (err)
1871 goto cleanup;
1872 }
1873
1874 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1875 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1876
1877 rtnl_unlock();
1878
1879 return 0;
1880
1881cleanup:
1882 macsec_rxsa_put(rx_sa);
1883 rtnl_unlock();
1884 return err;
1885}
1886
1887static bool validate_add_rxsc(struct nlattr **attrs)
1888{
1889 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1890 return false;
1891
1892 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1893 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1894 return false;
1895 }
1896
1897 return true;
1898}
1899
1900static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1901{
1902 struct net_device *dev;
1903 sci_t sci = MACSEC_UNDEF_SCI;
1904 struct nlattr **attrs = info->attrs;
1905 struct macsec_rx_sc *rx_sc;
1906 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1907 struct macsec_secy *secy;
1908 bool active = true;
1909 int ret;
1910
1911 if (!attrs[MACSEC_ATTR_IFINDEX])
1912 return -EINVAL;
1913
1914 if (parse_rxsc_config(attrs, tb_rxsc))
1915 return -EINVAL;
1916
1917 if (!validate_add_rxsc(tb_rxsc))
1918 return -EINVAL;
1919
1920 rtnl_lock();
1921 dev = get_dev_from_nl(genl_info_net(info), attrs);
1922 if (IS_ERR(dev)) {
1923 rtnl_unlock();
1924 return PTR_ERR(dev);
1925 }
1926
1927 secy = &macsec_priv(dev)->secy;
1928 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1929
1930 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1931 active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1932
1933 rx_sc = create_rx_sc(dev, sci, active);
1934 if (IS_ERR(rx_sc)) {
1935 rtnl_unlock();
1936 return PTR_ERR(rx_sc);
1937 }
1938
1939 if (macsec_is_offloaded(netdev_priv(dev))) {
1940 const struct macsec_ops *ops;
1941 struct macsec_context ctx;
1942
1943 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1944 if (!ops) {
1945 ret = -EOPNOTSUPP;
1946 goto cleanup;
1947 }
1948
1949 ctx.rx_sc = rx_sc;
1950 ctx.secy = secy;
1951
1952 ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1953 if (ret)
1954 goto cleanup;
1955 }
1956
1957 rtnl_unlock();
1958
1959 return 0;
1960
1961cleanup:
1962 del_rx_sc(secy, sci);
1963 free_rx_sc(rx_sc);
1964 rtnl_unlock();
1965 return ret;
1966}
1967
1968static bool validate_add_txsa(struct nlattr **attrs)
1969{
1970 if (!attrs[MACSEC_SA_ATTR_AN] ||
1971 !attrs[MACSEC_SA_ATTR_PN] ||
1972 !attrs[MACSEC_SA_ATTR_KEY] ||
1973 !attrs[MACSEC_SA_ATTR_KEYID])
1974 return false;
1975
1976 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1977 return false;
1978
1979 if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1980 return false;
1981
1982 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1983 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1984 return false;
1985 }
1986
1987 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1988 return false;
1989
1990 return true;
1991}
1992
1993static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1994{
1995 struct net_device *dev;
1996 struct nlattr **attrs = info->attrs;
1997 struct macsec_secy *secy;
1998 struct macsec_tx_sc *tx_sc;
1999 struct macsec_tx_sa *tx_sa;
2000 unsigned char assoc_num;
2001 int pn_len;
2002 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2003 bool was_operational;
2004 int err;
2005
2006 if (!attrs[MACSEC_ATTR_IFINDEX])
2007 return -EINVAL;
2008
2009 if (parse_sa_config(attrs, tb_sa))
2010 return -EINVAL;
2011
2012 if (!validate_add_txsa(tb_sa))
2013 return -EINVAL;
2014
2015 rtnl_lock();
2016 dev = get_dev_from_nl(genl_info_net(info), attrs);
2017 if (IS_ERR(dev)) {
2018 rtnl_unlock();
2019 return PTR_ERR(dev);
2020 }
2021
2022 secy = &macsec_priv(dev)->secy;
2023 tx_sc = &secy->tx_sc;
2024
2025 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
2026
2027 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
2028 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
2029 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
2030 rtnl_unlock();
2031 return -EINVAL;
2032 }
2033
2034 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2035 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2036 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
2037 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2038 rtnl_unlock();
2039 return -EINVAL;
2040 }
2041
2042 if (secy->xpn) {
2043 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
2044 rtnl_unlock();
2045 return -EINVAL;
2046 }
2047
2048 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
2049 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
2050 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
2051 MACSEC_SALT_LEN);
2052 rtnl_unlock();
2053 return -EINVAL;
2054 }
2055 }
2056
2057 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
2058 if (tx_sa) {
2059 rtnl_unlock();
2060 return -EBUSY;
2061 }
2062
2063 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
2064 if (!tx_sa) {
2065 rtnl_unlock();
2066 return -ENOMEM;
2067 }
2068
2069 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2070 secy->key_len, secy->icv_len);
2071 if (err < 0) {
2072 kfree(tx_sa);
2073 rtnl_unlock();
2074 return err;
2075 }
2076
2077 spin_lock_bh(&tx_sa->lock);
2078 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2079 spin_unlock_bh(&tx_sa->lock);
2080
2081 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2082 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2083
2084 was_operational = secy->operational;
2085 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
2086 secy->operational = true;
2087
2088 if (secy->xpn) {
2089 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
2090 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
2091 MACSEC_SALT_LEN);
2092 }
2093
2094 /* If h/w offloading is available, propagate to the device */
2095 if (macsec_is_offloaded(netdev_priv(dev))) {
2096 const struct macsec_ops *ops;
2097 struct macsec_context ctx;
2098
2099 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2100 if (!ops) {
2101 err = -EOPNOTSUPP;
2102 goto cleanup;
2103 }
2104
2105 ctx.sa.assoc_num = assoc_num;
2106 ctx.sa.tx_sa = tx_sa;
2107 ctx.secy = secy;
2108 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2109 secy->key_len);
2110
2111 err = macsec_offload(ops->mdo_add_txsa, &ctx);
2112 memzero_explicit(ctx.sa.key, secy->key_len);
2113 if (err)
2114 goto cleanup;
2115 }
2116
2117 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
2118 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
2119
2120 rtnl_unlock();
2121
2122 return 0;
2123
2124cleanup:
2125 secy->operational = was_operational;
2126 macsec_txsa_put(tx_sa);
2127 rtnl_unlock();
2128 return err;
2129}
2130
2131static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
2132{
2133 struct nlattr **attrs = info->attrs;
2134 struct net_device *dev;
2135 struct macsec_secy *secy;
2136 struct macsec_rx_sc *rx_sc;
2137 struct macsec_rx_sa *rx_sa;
2138 u8 assoc_num;
2139 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2140 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2141 int ret;
2142
2143 if (!attrs[MACSEC_ATTR_IFINDEX])
2144 return -EINVAL;
2145
2146 if (parse_sa_config(attrs, tb_sa))
2147 return -EINVAL;
2148
2149 if (parse_rxsc_config(attrs, tb_rxsc))
2150 return -EINVAL;
2151
2152 rtnl_lock();
2153 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2154 &dev, &secy, &rx_sc, &assoc_num);
2155 if (IS_ERR(rx_sa)) {
2156 rtnl_unlock();
2157 return PTR_ERR(rx_sa);
2158 }
2159
2160 if (rx_sa->active) {
2161 rtnl_unlock();
2162 return -EBUSY;
2163 }
2164
2165 /* If h/w offloading is available, propagate to the device */
2166 if (macsec_is_offloaded(netdev_priv(dev))) {
2167 const struct macsec_ops *ops;
2168 struct macsec_context ctx;
2169
2170 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2171 if (!ops) {
2172 ret = -EOPNOTSUPP;
2173 goto cleanup;
2174 }
2175
2176 ctx.sa.assoc_num = assoc_num;
2177 ctx.sa.rx_sa = rx_sa;
2178 ctx.secy = secy;
2179
2180 ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
2181 if (ret)
2182 goto cleanup;
2183 }
2184
2185 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
2186 clear_rx_sa(rx_sa);
2187
2188 rtnl_unlock();
2189
2190 return 0;
2191
2192cleanup:
2193 rtnl_unlock();
2194 return ret;
2195}
2196
2197static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
2198{
2199 struct nlattr **attrs = info->attrs;
2200 struct net_device *dev;
2201 struct macsec_secy *secy;
2202 struct macsec_rx_sc *rx_sc;
2203 sci_t sci;
2204 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2205 int ret;
2206
2207 if (!attrs[MACSEC_ATTR_IFINDEX])
2208 return -EINVAL;
2209
2210 if (parse_rxsc_config(attrs, tb_rxsc))
2211 return -EINVAL;
2212
2213 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
2214 return -EINVAL;
2215
2216 rtnl_lock();
2217 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2218 if (IS_ERR(dev)) {
2219 rtnl_unlock();
2220 return PTR_ERR(dev);
2221 }
2222
2223 secy = &macsec_priv(dev)->secy;
2224 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2225
2226 rx_sc = del_rx_sc(secy, sci);
2227 if (!rx_sc) {
2228 rtnl_unlock();
2229 return -ENODEV;
2230 }
2231
2232 /* If h/w offloading is available, propagate to the device */
2233 if (macsec_is_offloaded(netdev_priv(dev))) {
2234 const struct macsec_ops *ops;
2235 struct macsec_context ctx;
2236
2237 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2238 if (!ops) {
2239 ret = -EOPNOTSUPP;
2240 goto cleanup;
2241 }
2242
2243 ctx.rx_sc = rx_sc;
2244 ctx.secy = secy;
2245 ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2246 if (ret)
2247 goto cleanup;
2248 }
2249
2250 free_rx_sc(rx_sc);
2251 rtnl_unlock();
2252
2253 return 0;
2254
2255cleanup:
2256 rtnl_unlock();
2257 return ret;
2258}
2259
2260static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2261{
2262 struct nlattr **attrs = info->attrs;
2263 struct net_device *dev;
2264 struct macsec_secy *secy;
2265 struct macsec_tx_sc *tx_sc;
2266 struct macsec_tx_sa *tx_sa;
2267 u8 assoc_num;
2268 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2269 int ret;
2270
2271 if (!attrs[MACSEC_ATTR_IFINDEX])
2272 return -EINVAL;
2273
2274 if (parse_sa_config(attrs, tb_sa))
2275 return -EINVAL;
2276
2277 rtnl_lock();
2278 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2279 &dev, &secy, &tx_sc, &assoc_num);
2280 if (IS_ERR(tx_sa)) {
2281 rtnl_unlock();
2282 return PTR_ERR(tx_sa);
2283 }
2284
2285 if (tx_sa->active) {
2286 rtnl_unlock();
2287 return -EBUSY;
2288 }
2289
2290 /* If h/w offloading is available, propagate to the device */
2291 if (macsec_is_offloaded(netdev_priv(dev))) {
2292 const struct macsec_ops *ops;
2293 struct macsec_context ctx;
2294
2295 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2296 if (!ops) {
2297 ret = -EOPNOTSUPP;
2298 goto cleanup;
2299 }
2300
2301 ctx.sa.assoc_num = assoc_num;
2302 ctx.sa.tx_sa = tx_sa;
2303 ctx.secy = secy;
2304
2305 ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2306 if (ret)
2307 goto cleanup;
2308 }
2309
2310 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2311 clear_tx_sa(tx_sa);
2312
2313 rtnl_unlock();
2314
2315 return 0;
2316
2317cleanup:
2318 rtnl_unlock();
2319 return ret;
2320}
2321
2322static bool validate_upd_sa(struct nlattr **attrs)
2323{
2324 if (!attrs[MACSEC_SA_ATTR_AN] ||
2325 attrs[MACSEC_SA_ATTR_KEY] ||
2326 attrs[MACSEC_SA_ATTR_KEYID] ||
2327 attrs[MACSEC_SA_ATTR_SSCI] ||
2328 attrs[MACSEC_SA_ATTR_SALT])
2329 return false;
2330
2331 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2332 return false;
2333
2334 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
2335 return false;
2336
2337 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2338 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2339 return false;
2340 }
2341
2342 return true;
2343}
2344
2345static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2346{
2347 struct nlattr **attrs = info->attrs;
2348 struct net_device *dev;
2349 struct macsec_secy *secy;
2350 struct macsec_tx_sc *tx_sc;
2351 struct macsec_tx_sa *tx_sa;
2352 u8 assoc_num;
2353 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2354 bool was_operational, was_active;
2355 pn_t prev_pn;
2356 int ret = 0;
2357
2358 prev_pn.full64 = 0;
2359
2360 if (!attrs[MACSEC_ATTR_IFINDEX])
2361 return -EINVAL;
2362
2363 if (parse_sa_config(attrs, tb_sa))
2364 return -EINVAL;
2365
2366 if (!validate_upd_sa(tb_sa))
2367 return -EINVAL;
2368
2369 rtnl_lock();
2370 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2371 &dev, &secy, &tx_sc, &assoc_num);
2372 if (IS_ERR(tx_sa)) {
2373 rtnl_unlock();
2374 return PTR_ERR(tx_sa);
2375 }
2376
2377 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2378 int pn_len;
2379
2380 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2381 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2382 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
2383 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2384 rtnl_unlock();
2385 return -EINVAL;
2386 }
2387
2388 spin_lock_bh(&tx_sa->lock);
2389 prev_pn = tx_sa->next_pn_halves;
2390 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2391 spin_unlock_bh(&tx_sa->lock);
2392 }
2393
2394 was_active = tx_sa->active;
2395 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2396 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2397
2398 was_operational = secy->operational;
2399 if (assoc_num == tx_sc->encoding_sa)
2400 secy->operational = tx_sa->active;
2401
2402 /* If h/w offloading is available, propagate to the device */
2403 if (macsec_is_offloaded(netdev_priv(dev))) {
2404 const struct macsec_ops *ops;
2405 struct macsec_context ctx;
2406
2407 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2408 if (!ops) {
2409 ret = -EOPNOTSUPP;
2410 goto cleanup;
2411 }
2412
2413 ctx.sa.assoc_num = assoc_num;
2414 ctx.sa.tx_sa = tx_sa;
2415 ctx.sa.update_pn = !!prev_pn.full64;
2416 ctx.secy = secy;
2417
2418 ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
2419 if (ret)
2420 goto cleanup;
2421 }
2422
2423 rtnl_unlock();
2424
2425 return 0;
2426
2427cleanup:
2428 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2429 spin_lock_bh(&tx_sa->lock);
2430 tx_sa->next_pn_halves = prev_pn;
2431 spin_unlock_bh(&tx_sa->lock);
2432 }
2433 tx_sa->active = was_active;
2434 secy->operational = was_operational;
2435 rtnl_unlock();
2436 return ret;
2437}
2438
2439static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2440{
2441 struct nlattr **attrs = info->attrs;
2442 struct net_device *dev;
2443 struct macsec_secy *secy;
2444 struct macsec_rx_sc *rx_sc;
2445 struct macsec_rx_sa *rx_sa;
2446 u8 assoc_num;
2447 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2448 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2449 bool was_active;
2450 pn_t prev_pn;
2451 int ret = 0;
2452
2453 prev_pn.full64 = 0;
2454
2455 if (!attrs[MACSEC_ATTR_IFINDEX])
2456 return -EINVAL;
2457
2458 if (parse_rxsc_config(attrs, tb_rxsc))
2459 return -EINVAL;
2460
2461 if (parse_sa_config(attrs, tb_sa))
2462 return -EINVAL;
2463
2464 if (!validate_upd_sa(tb_sa))
2465 return -EINVAL;
2466
2467 rtnl_lock();
2468 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2469 &dev, &secy, &rx_sc, &assoc_num);
2470 if (IS_ERR(rx_sa)) {
2471 rtnl_unlock();
2472 return PTR_ERR(rx_sa);
2473 }
2474
2475 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2476 int pn_len;
2477
2478 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2479 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2480 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
2481 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2482 rtnl_unlock();
2483 return -EINVAL;
2484 }
2485
2486 spin_lock_bh(&rx_sa->lock);
2487 prev_pn = rx_sa->next_pn_halves;
2488 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2489 spin_unlock_bh(&rx_sa->lock);
2490 }
2491
2492 was_active = rx_sa->active;
2493 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2494 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2495
2496 /* If h/w offloading is available, propagate to the device */
2497 if (macsec_is_offloaded(netdev_priv(dev))) {
2498 const struct macsec_ops *ops;
2499 struct macsec_context ctx;
2500
2501 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2502 if (!ops) {
2503 ret = -EOPNOTSUPP;
2504 goto cleanup;
2505 }
2506
2507 ctx.sa.assoc_num = assoc_num;
2508 ctx.sa.rx_sa = rx_sa;
2509 ctx.sa.update_pn = !!prev_pn.full64;
2510 ctx.secy = secy;
2511
2512 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2513 if (ret)
2514 goto cleanup;
2515 }
2516
2517 rtnl_unlock();
2518 return 0;
2519
2520cleanup:
2521 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2522 spin_lock_bh(&rx_sa->lock);
2523 rx_sa->next_pn_halves = prev_pn;
2524 spin_unlock_bh(&rx_sa->lock);
2525 }
2526 rx_sa->active = was_active;
2527 rtnl_unlock();
2528 return ret;
2529}
2530
2531static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2532{
2533 struct nlattr **attrs = info->attrs;
2534 struct net_device *dev;
2535 struct macsec_secy *secy;
2536 struct macsec_rx_sc *rx_sc;
2537 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2538 unsigned int prev_n_rx_sc;
2539 bool was_active;
2540 int ret;
2541
2542 if (!attrs[MACSEC_ATTR_IFINDEX])
2543 return -EINVAL;
2544
2545 if (parse_rxsc_config(attrs, tb_rxsc))
2546 return -EINVAL;
2547
2548 if (!validate_add_rxsc(tb_rxsc))
2549 return -EINVAL;
2550
2551 rtnl_lock();
2552 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2553 if (IS_ERR(rx_sc)) {
2554 rtnl_unlock();
2555 return PTR_ERR(rx_sc);
2556 }
2557
2558 was_active = rx_sc->active;
2559 prev_n_rx_sc = secy->n_rx_sc;
2560 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2561 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2562
2563 if (rx_sc->active != new)
2564 secy->n_rx_sc += new ? 1 : -1;
2565
2566 rx_sc->active = new;
2567 }
2568
2569 /* If h/w offloading is available, propagate to the device */
2570 if (macsec_is_offloaded(netdev_priv(dev))) {
2571 const struct macsec_ops *ops;
2572 struct macsec_context ctx;
2573
2574 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2575 if (!ops) {
2576 ret = -EOPNOTSUPP;
2577 goto cleanup;
2578 }
2579
2580 ctx.rx_sc = rx_sc;
2581 ctx.secy = secy;
2582
2583 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2584 if (ret)
2585 goto cleanup;
2586 }
2587
2588 rtnl_unlock();
2589
2590 return 0;
2591
2592cleanup:
2593 secy->n_rx_sc = prev_n_rx_sc;
2594 rx_sc->active = was_active;
2595 rtnl_unlock();
2596 return ret;
2597}
2598
2599static bool macsec_is_configured(struct macsec_dev *macsec)
2600{
2601 struct macsec_secy *secy = &macsec->secy;
2602 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2603 int i;
2604
2605 if (secy->rx_sc)
2606 return true;
2607
2608 for (i = 0; i < MACSEC_NUM_AN; i++)
2609 if (tx_sc->sa[i])
2610 return true;
2611
2612 return false;
2613}
2614
2615static bool macsec_needs_tx_tag(struct macsec_dev *macsec,
2616 const struct macsec_ops *ops)
2617{
2618 return macsec->offload == MACSEC_OFFLOAD_PHY &&
2619 ops->mdo_insert_tx_tag;
2620}
2621
2622static void macsec_set_head_tail_room(struct net_device *dev)
2623{
2624 struct macsec_dev *macsec = macsec_priv(dev);
2625 struct net_device *real_dev = macsec->real_dev;
2626 int needed_headroom, needed_tailroom;
2627 const struct macsec_ops *ops;
2628
2629 ops = macsec_get_ops(macsec, NULL);
2630 if (ops) {
2631 needed_headroom = ops->needed_headroom;
2632 needed_tailroom = ops->needed_tailroom;
2633 } else {
2634 needed_headroom = MACSEC_NEEDED_HEADROOM;
2635 needed_tailroom = MACSEC_NEEDED_TAILROOM;
2636 }
2637
2638 dev->needed_headroom = real_dev->needed_headroom + needed_headroom;
2639 dev->needed_tailroom = real_dev->needed_tailroom + needed_tailroom;
2640}
2641
2642static int macsec_update_offload(struct net_device *dev, enum macsec_offload offload)
2643{
2644 enum macsec_offload prev_offload;
2645 const struct macsec_ops *ops;
2646 struct macsec_context ctx;
2647 struct macsec_dev *macsec;
2648 int ret = 0;
2649
2650 macsec = macsec_priv(dev);
2651
2652 /* Check if the offloading mode is supported by the underlying layers */
2653 if (offload != MACSEC_OFFLOAD_OFF &&
2654 !macsec_check_offload(offload, macsec))
2655 return -EOPNOTSUPP;
2656
2657 /* Check if the net device is busy. */
2658 if (netif_running(dev))
2659 return -EBUSY;
2660
2661 /* Check if the device already has rules configured: we do not support
2662 * rules migration.
2663 */
2664 if (macsec_is_configured(macsec))
2665 return -EBUSY;
2666
2667 prev_offload = macsec->offload;
2668
2669 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2670 macsec, &ctx);
2671 if (!ops)
2672 return -EOPNOTSUPP;
2673
2674 macsec->offload = offload;
2675
2676 ctx.secy = &macsec->secy;
2677 ret = offload == MACSEC_OFFLOAD_OFF ? macsec_offload(ops->mdo_del_secy, &ctx)
2678 : macsec_offload(ops->mdo_add_secy, &ctx);
2679 if (ret) {
2680 macsec->offload = prev_offload;
2681 return ret;
2682 }
2683
2684 macsec_set_head_tail_room(dev);
2685 macsec->insert_tx_tag = macsec_needs_tx_tag(macsec, ops);
2686
2687 return ret;
2688}
2689
2690static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2691{
2692 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2693 struct nlattr **attrs = info->attrs;
2694 enum macsec_offload offload;
2695 struct macsec_dev *macsec;
2696 struct net_device *dev;
2697 int ret = 0;
2698
2699 if (!attrs[MACSEC_ATTR_IFINDEX])
2700 return -EINVAL;
2701
2702 if (!attrs[MACSEC_ATTR_OFFLOAD])
2703 return -EINVAL;
2704
2705 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2706 attrs[MACSEC_ATTR_OFFLOAD],
2707 macsec_genl_offload_policy, NULL))
2708 return -EINVAL;
2709
2710 rtnl_lock();
2711
2712 dev = get_dev_from_nl(genl_info_net(info), attrs);
2713 if (IS_ERR(dev)) {
2714 ret = PTR_ERR(dev);
2715 goto out;
2716 }
2717 macsec = macsec_priv(dev);
2718
2719 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) {
2720 ret = -EINVAL;
2721 goto out;
2722 }
2723
2724 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2725
2726 if (macsec->offload != offload)
2727 ret = macsec_update_offload(dev, offload);
2728out:
2729 rtnl_unlock();
2730 return ret;
2731}
2732
2733static void get_tx_sa_stats(struct net_device *dev, int an,
2734 struct macsec_tx_sa *tx_sa,
2735 struct macsec_tx_sa_stats *sum)
2736{
2737 struct macsec_dev *macsec = macsec_priv(dev);
2738 int cpu;
2739
2740 /* If h/w offloading is available, propagate to the device */
2741 if (macsec_is_offloaded(macsec)) {
2742 const struct macsec_ops *ops;
2743 struct macsec_context ctx;
2744
2745 ops = macsec_get_ops(macsec, &ctx);
2746 if (ops) {
2747 ctx.sa.assoc_num = an;
2748 ctx.sa.tx_sa = tx_sa;
2749 ctx.stats.tx_sa_stats = sum;
2750 ctx.secy = &macsec_priv(dev)->secy;
2751 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
2752 }
2753 return;
2754 }
2755
2756 for_each_possible_cpu(cpu) {
2757 const struct macsec_tx_sa_stats *stats =
2758 per_cpu_ptr(tx_sa->stats, cpu);
2759
2760 sum->OutPktsProtected += stats->OutPktsProtected;
2761 sum->OutPktsEncrypted += stats->OutPktsEncrypted;
2762 }
2763}
2764
2765static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
2766{
2767 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
2768 sum->OutPktsProtected) ||
2769 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2770 sum->OutPktsEncrypted))
2771 return -EMSGSIZE;
2772
2773 return 0;
2774}
2775
2776static void get_rx_sa_stats(struct net_device *dev,
2777 struct macsec_rx_sc *rx_sc, int an,
2778 struct macsec_rx_sa *rx_sa,
2779 struct macsec_rx_sa_stats *sum)
2780{
2781 struct macsec_dev *macsec = macsec_priv(dev);
2782 int cpu;
2783
2784 /* If h/w offloading is available, propagate to the device */
2785 if (macsec_is_offloaded(macsec)) {
2786 const struct macsec_ops *ops;
2787 struct macsec_context ctx;
2788
2789 ops = macsec_get_ops(macsec, &ctx);
2790 if (ops) {
2791 ctx.sa.assoc_num = an;
2792 ctx.sa.rx_sa = rx_sa;
2793 ctx.stats.rx_sa_stats = sum;
2794 ctx.secy = &macsec_priv(dev)->secy;
2795 ctx.rx_sc = rx_sc;
2796 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
2797 }
2798 return;
2799 }
2800
2801 for_each_possible_cpu(cpu) {
2802 const struct macsec_rx_sa_stats *stats =
2803 per_cpu_ptr(rx_sa->stats, cpu);
2804
2805 sum->InPktsOK += stats->InPktsOK;
2806 sum->InPktsInvalid += stats->InPktsInvalid;
2807 sum->InPktsNotValid += stats->InPktsNotValid;
2808 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
2809 sum->InPktsUnusedSA += stats->InPktsUnusedSA;
2810 }
2811}
2812
2813static int copy_rx_sa_stats(struct sk_buff *skb,
2814 struct macsec_rx_sa_stats *sum)
2815{
2816 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
2817 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
2818 sum->InPktsInvalid) ||
2819 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
2820 sum->InPktsNotValid) ||
2821 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2822 sum->InPktsNotUsingSA) ||
2823 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
2824 sum->InPktsUnusedSA))
2825 return -EMSGSIZE;
2826
2827 return 0;
2828}
2829
2830static void get_rx_sc_stats(struct net_device *dev,
2831 struct macsec_rx_sc *rx_sc,
2832 struct macsec_rx_sc_stats *sum)
2833{
2834 struct macsec_dev *macsec = macsec_priv(dev);
2835 int cpu;
2836
2837 /* If h/w offloading is available, propagate to the device */
2838 if (macsec_is_offloaded(macsec)) {
2839 const struct macsec_ops *ops;
2840 struct macsec_context ctx;
2841
2842 ops = macsec_get_ops(macsec, &ctx);
2843 if (ops) {
2844 ctx.stats.rx_sc_stats = sum;
2845 ctx.secy = &macsec_priv(dev)->secy;
2846 ctx.rx_sc = rx_sc;
2847 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
2848 }
2849 return;
2850 }
2851
2852 for_each_possible_cpu(cpu) {
2853 const struct pcpu_rx_sc_stats *stats;
2854 struct macsec_rx_sc_stats tmp;
2855 unsigned int start;
2856
2857 stats = per_cpu_ptr(rx_sc->stats, cpu);
2858 do {
2859 start = u64_stats_fetch_begin(&stats->syncp);
2860 memcpy(&tmp, &stats->stats, sizeof(tmp));
2861 } while (u64_stats_fetch_retry(&stats->syncp, start));
2862
2863 sum->InOctetsValidated += tmp.InOctetsValidated;
2864 sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
2865 sum->InPktsUnchecked += tmp.InPktsUnchecked;
2866 sum->InPktsDelayed += tmp.InPktsDelayed;
2867 sum->InPktsOK += tmp.InPktsOK;
2868 sum->InPktsInvalid += tmp.InPktsInvalid;
2869 sum->InPktsLate += tmp.InPktsLate;
2870 sum->InPktsNotValid += tmp.InPktsNotValid;
2871 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2872 sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
2873 }
2874}
2875
2876static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
2877{
2878 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2879 sum->InOctetsValidated,
2880 MACSEC_RXSC_STATS_ATTR_PAD) ||
2881 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2882 sum->InOctetsDecrypted,
2883 MACSEC_RXSC_STATS_ATTR_PAD) ||
2884 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2885 sum->InPktsUnchecked,
2886 MACSEC_RXSC_STATS_ATTR_PAD) ||
2887 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2888 sum->InPktsDelayed,
2889 MACSEC_RXSC_STATS_ATTR_PAD) ||
2890 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2891 sum->InPktsOK,
2892 MACSEC_RXSC_STATS_ATTR_PAD) ||
2893 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2894 sum->InPktsInvalid,
2895 MACSEC_RXSC_STATS_ATTR_PAD) ||
2896 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2897 sum->InPktsLate,
2898 MACSEC_RXSC_STATS_ATTR_PAD) ||
2899 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2900 sum->InPktsNotValid,
2901 MACSEC_RXSC_STATS_ATTR_PAD) ||
2902 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2903 sum->InPktsNotUsingSA,
2904 MACSEC_RXSC_STATS_ATTR_PAD) ||
2905 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2906 sum->InPktsUnusedSA,
2907 MACSEC_RXSC_STATS_ATTR_PAD))
2908 return -EMSGSIZE;
2909
2910 return 0;
2911}
2912
2913static void get_tx_sc_stats(struct net_device *dev,
2914 struct macsec_tx_sc_stats *sum)
2915{
2916 struct macsec_dev *macsec = macsec_priv(dev);
2917 int cpu;
2918
2919 /* If h/w offloading is available, propagate to the device */
2920 if (macsec_is_offloaded(macsec)) {
2921 const struct macsec_ops *ops;
2922 struct macsec_context ctx;
2923
2924 ops = macsec_get_ops(macsec, &ctx);
2925 if (ops) {
2926 ctx.stats.tx_sc_stats = sum;
2927 ctx.secy = &macsec_priv(dev)->secy;
2928 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
2929 }
2930 return;
2931 }
2932
2933 for_each_possible_cpu(cpu) {
2934 const struct pcpu_tx_sc_stats *stats;
2935 struct macsec_tx_sc_stats tmp;
2936 unsigned int start;
2937
2938 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
2939 do {
2940 start = u64_stats_fetch_begin(&stats->syncp);
2941 memcpy(&tmp, &stats->stats, sizeof(tmp));
2942 } while (u64_stats_fetch_retry(&stats->syncp, start));
2943
2944 sum->OutPktsProtected += tmp.OutPktsProtected;
2945 sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
2946 sum->OutOctetsProtected += tmp.OutOctetsProtected;
2947 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2948 }
2949}
2950
2951static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
2952{
2953 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2954 sum->OutPktsProtected,
2955 MACSEC_TXSC_STATS_ATTR_PAD) ||
2956 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2957 sum->OutPktsEncrypted,
2958 MACSEC_TXSC_STATS_ATTR_PAD) ||
2959 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2960 sum->OutOctetsProtected,
2961 MACSEC_TXSC_STATS_ATTR_PAD) ||
2962 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2963 sum->OutOctetsEncrypted,
2964 MACSEC_TXSC_STATS_ATTR_PAD))
2965 return -EMSGSIZE;
2966
2967 return 0;
2968}
2969
2970static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
2971{
2972 struct macsec_dev *macsec = macsec_priv(dev);
2973 int cpu;
2974
2975 /* If h/w offloading is available, propagate to the device */
2976 if (macsec_is_offloaded(macsec)) {
2977 const struct macsec_ops *ops;
2978 struct macsec_context ctx;
2979
2980 ops = macsec_get_ops(macsec, &ctx);
2981 if (ops) {
2982 ctx.stats.dev_stats = sum;
2983 ctx.secy = &macsec_priv(dev)->secy;
2984 macsec_offload(ops->mdo_get_dev_stats, &ctx);
2985 }
2986 return;
2987 }
2988
2989 for_each_possible_cpu(cpu) {
2990 const struct pcpu_secy_stats *stats;
2991 struct macsec_dev_stats tmp;
2992 unsigned int start;
2993
2994 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
2995 do {
2996 start = u64_stats_fetch_begin(&stats->syncp);
2997 memcpy(&tmp, &stats->stats, sizeof(tmp));
2998 } while (u64_stats_fetch_retry(&stats->syncp, start));
2999
3000 sum->OutPktsUntagged += tmp.OutPktsUntagged;
3001 sum->InPktsUntagged += tmp.InPktsUntagged;
3002 sum->OutPktsTooLong += tmp.OutPktsTooLong;
3003 sum->InPktsNoTag += tmp.InPktsNoTag;
3004 sum->InPktsBadTag += tmp.InPktsBadTag;
3005 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
3006 sum->InPktsNoSCI += tmp.InPktsNoSCI;
3007 sum->InPktsOverrun += tmp.InPktsOverrun;
3008 }
3009}
3010
3011static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
3012{
3013 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
3014 sum->OutPktsUntagged,
3015 MACSEC_SECY_STATS_ATTR_PAD) ||
3016 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
3017 sum->InPktsUntagged,
3018 MACSEC_SECY_STATS_ATTR_PAD) ||
3019 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
3020 sum->OutPktsTooLong,
3021 MACSEC_SECY_STATS_ATTR_PAD) ||
3022 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
3023 sum->InPktsNoTag,
3024 MACSEC_SECY_STATS_ATTR_PAD) ||
3025 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
3026 sum->InPktsBadTag,
3027 MACSEC_SECY_STATS_ATTR_PAD) ||
3028 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
3029 sum->InPktsUnknownSCI,
3030 MACSEC_SECY_STATS_ATTR_PAD) ||
3031 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
3032 sum->InPktsNoSCI,
3033 MACSEC_SECY_STATS_ATTR_PAD) ||
3034 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
3035 sum->InPktsOverrun,
3036 MACSEC_SECY_STATS_ATTR_PAD))
3037 return -EMSGSIZE;
3038
3039 return 0;
3040}
3041
3042static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
3043{
3044 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3045 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
3046 MACSEC_ATTR_SECY);
3047 u64 csid;
3048
3049 if (!secy_nest)
3050 return 1;
3051
3052 switch (secy->key_len) {
3053 case MACSEC_GCM_AES_128_SAK_LEN:
3054 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
3055 break;
3056 case MACSEC_GCM_AES_256_SAK_LEN:
3057 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
3058 break;
3059 default:
3060 goto cancel;
3061 }
3062
3063 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
3064 MACSEC_SECY_ATTR_PAD) ||
3065 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
3066 csid, MACSEC_SECY_ATTR_PAD) ||
3067 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
3068 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
3069 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
3070 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
3071 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
3072 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
3073 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
3074 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
3075 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
3076 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
3077 goto cancel;
3078
3079 if (secy->replay_protect) {
3080 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
3081 goto cancel;
3082 }
3083
3084 nla_nest_end(skb, secy_nest);
3085 return 0;
3086
3087cancel:
3088 nla_nest_cancel(skb, secy_nest);
3089 return 1;
3090}
3091
3092static noinline_for_stack int
3093dump_secy(struct macsec_secy *secy, struct net_device *dev,
3094 struct sk_buff *skb, struct netlink_callback *cb)
3095{
3096 struct macsec_tx_sc_stats tx_sc_stats = {0, };
3097 struct macsec_tx_sa_stats tx_sa_stats = {0, };
3098 struct macsec_rx_sc_stats rx_sc_stats = {0, };
3099 struct macsec_rx_sa_stats rx_sa_stats = {0, };
3100 struct macsec_dev *macsec = netdev_priv(dev);
3101 struct macsec_dev_stats dev_stats = {0, };
3102 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3103 struct nlattr *txsa_list, *rxsc_list;
3104 struct macsec_rx_sc *rx_sc;
3105 struct nlattr *attr;
3106 void *hdr;
3107 int i, j;
3108
3109 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3110 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
3111 if (!hdr)
3112 return -EMSGSIZE;
3113
3114 genl_dump_check_consistent(cb, hdr);
3115
3116 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
3117 goto nla_put_failure;
3118
3119 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
3120 if (!attr)
3121 goto nla_put_failure;
3122 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
3123 goto nla_put_failure;
3124 nla_nest_end(skb, attr);
3125
3126 if (nla_put_secy(secy, skb))
3127 goto nla_put_failure;
3128
3129 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
3130 if (!attr)
3131 goto nla_put_failure;
3132
3133 get_tx_sc_stats(dev, &tx_sc_stats);
3134 if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
3135 nla_nest_cancel(skb, attr);
3136 goto nla_put_failure;
3137 }
3138 nla_nest_end(skb, attr);
3139
3140 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
3141 if (!attr)
3142 goto nla_put_failure;
3143 get_secy_stats(dev, &dev_stats);
3144 if (copy_secy_stats(skb, &dev_stats)) {
3145 nla_nest_cancel(skb, attr);
3146 goto nla_put_failure;
3147 }
3148 nla_nest_end(skb, attr);
3149
3150 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
3151 if (!txsa_list)
3152 goto nla_put_failure;
3153 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
3154 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
3155 struct nlattr *txsa_nest;
3156 u64 pn;
3157 int pn_len;
3158
3159 if (!tx_sa)
3160 continue;
3161
3162 txsa_nest = nla_nest_start_noflag(skb, j++);
3163 if (!txsa_nest) {
3164 nla_nest_cancel(skb, txsa_list);
3165 goto nla_put_failure;
3166 }
3167
3168 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
3169 if (!attr) {
3170 nla_nest_cancel(skb, txsa_nest);
3171 nla_nest_cancel(skb, txsa_list);
3172 goto nla_put_failure;
3173 }
3174 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
3175 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
3176 if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
3177 nla_nest_cancel(skb, attr);
3178 nla_nest_cancel(skb, txsa_nest);
3179 nla_nest_cancel(skb, txsa_list);
3180 goto nla_put_failure;
3181 }
3182 nla_nest_end(skb, attr);
3183
3184 if (secy->xpn) {
3185 pn = tx_sa->next_pn;
3186 pn_len = MACSEC_XPN_PN_LEN;
3187 } else {
3188 pn = tx_sa->next_pn_halves.lower;
3189 pn_len = MACSEC_DEFAULT_PN_LEN;
3190 }
3191
3192 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3193 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3194 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
3195 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
3196 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
3197 nla_nest_cancel(skb, txsa_nest);
3198 nla_nest_cancel(skb, txsa_list);
3199 goto nla_put_failure;
3200 }
3201
3202 nla_nest_end(skb, txsa_nest);
3203 }
3204 nla_nest_end(skb, txsa_list);
3205
3206 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
3207 if (!rxsc_list)
3208 goto nla_put_failure;
3209
3210 j = 1;
3211 for_each_rxsc_rtnl(secy, rx_sc) {
3212 int k;
3213 struct nlattr *rxsa_list;
3214 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
3215
3216 if (!rxsc_nest) {
3217 nla_nest_cancel(skb, rxsc_list);
3218 goto nla_put_failure;
3219 }
3220
3221 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
3222 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
3223 MACSEC_RXSC_ATTR_PAD)) {
3224 nla_nest_cancel(skb, rxsc_nest);
3225 nla_nest_cancel(skb, rxsc_list);
3226 goto nla_put_failure;
3227 }
3228
3229 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
3230 if (!attr) {
3231 nla_nest_cancel(skb, rxsc_nest);
3232 nla_nest_cancel(skb, rxsc_list);
3233 goto nla_put_failure;
3234 }
3235 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
3236 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
3237 if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
3238 nla_nest_cancel(skb, attr);
3239 nla_nest_cancel(skb, rxsc_nest);
3240 nla_nest_cancel(skb, rxsc_list);
3241 goto nla_put_failure;
3242 }
3243 nla_nest_end(skb, attr);
3244
3245 rxsa_list = nla_nest_start_noflag(skb,
3246 MACSEC_RXSC_ATTR_SA_LIST);
3247 if (!rxsa_list) {
3248 nla_nest_cancel(skb, rxsc_nest);
3249 nla_nest_cancel(skb, rxsc_list);
3250 goto nla_put_failure;
3251 }
3252
3253 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
3254 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
3255 struct nlattr *rxsa_nest;
3256 u64 pn;
3257 int pn_len;
3258
3259 if (!rx_sa)
3260 continue;
3261
3262 rxsa_nest = nla_nest_start_noflag(skb, k++);
3263 if (!rxsa_nest) {
3264 nla_nest_cancel(skb, rxsa_list);
3265 nla_nest_cancel(skb, rxsc_nest);
3266 nla_nest_cancel(skb, rxsc_list);
3267 goto nla_put_failure;
3268 }
3269
3270 attr = nla_nest_start_noflag(skb,
3271 MACSEC_SA_ATTR_STATS);
3272 if (!attr) {
3273 nla_nest_cancel(skb, rxsa_list);
3274 nla_nest_cancel(skb, rxsc_nest);
3275 nla_nest_cancel(skb, rxsc_list);
3276 goto nla_put_failure;
3277 }
3278 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
3279 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
3280 if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
3281 nla_nest_cancel(skb, attr);
3282 nla_nest_cancel(skb, rxsa_list);
3283 nla_nest_cancel(skb, rxsc_nest);
3284 nla_nest_cancel(skb, rxsc_list);
3285 goto nla_put_failure;
3286 }
3287 nla_nest_end(skb, attr);
3288
3289 if (secy->xpn) {
3290 pn = rx_sa->next_pn;
3291 pn_len = MACSEC_XPN_PN_LEN;
3292 } else {
3293 pn = rx_sa->next_pn_halves.lower;
3294 pn_len = MACSEC_DEFAULT_PN_LEN;
3295 }
3296
3297 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3298 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3299 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
3300 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
3301 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
3302 nla_nest_cancel(skb, rxsa_nest);
3303 nla_nest_cancel(skb, rxsc_nest);
3304 nla_nest_cancel(skb, rxsc_list);
3305 goto nla_put_failure;
3306 }
3307 nla_nest_end(skb, rxsa_nest);
3308 }
3309
3310 nla_nest_end(skb, rxsa_list);
3311 nla_nest_end(skb, rxsc_nest);
3312 }
3313
3314 nla_nest_end(skb, rxsc_list);
3315
3316 genlmsg_end(skb, hdr);
3317
3318 return 0;
3319
3320nla_put_failure:
3321 genlmsg_cancel(skb, hdr);
3322 return -EMSGSIZE;
3323}
3324
3325static int macsec_generation = 1; /* protected by RTNL */
3326
3327static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
3328{
3329 struct net *net = sock_net(skb->sk);
3330 struct net_device *dev;
3331 int dev_idx, d;
3332
3333 dev_idx = cb->args[0];
3334
3335 d = 0;
3336 rtnl_lock();
3337
3338 cb->seq = macsec_generation;
3339
3340 for_each_netdev(net, dev) {
3341 struct macsec_secy *secy;
3342
3343 if (d < dev_idx)
3344 goto next;
3345
3346 if (!netif_is_macsec(dev))
3347 goto next;
3348
3349 secy = &macsec_priv(dev)->secy;
3350 if (dump_secy(secy, dev, skb, cb) < 0)
3351 goto done;
3352next:
3353 d++;
3354 }
3355
3356done:
3357 rtnl_unlock();
3358 cb->args[0] = d;
3359 return skb->len;
3360}
3361
3362static const struct genl_small_ops macsec_genl_ops[] = {
3363 {
3364 .cmd = MACSEC_CMD_GET_TXSC,
3365 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3366 .dumpit = macsec_dump_txsc,
3367 },
3368 {
3369 .cmd = MACSEC_CMD_ADD_RXSC,
3370 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3371 .doit = macsec_add_rxsc,
3372 .flags = GENL_ADMIN_PERM,
3373 },
3374 {
3375 .cmd = MACSEC_CMD_DEL_RXSC,
3376 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3377 .doit = macsec_del_rxsc,
3378 .flags = GENL_ADMIN_PERM,
3379 },
3380 {
3381 .cmd = MACSEC_CMD_UPD_RXSC,
3382 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3383 .doit = macsec_upd_rxsc,
3384 .flags = GENL_ADMIN_PERM,
3385 },
3386 {
3387 .cmd = MACSEC_CMD_ADD_TXSA,
3388 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3389 .doit = macsec_add_txsa,
3390 .flags = GENL_ADMIN_PERM,
3391 },
3392 {
3393 .cmd = MACSEC_CMD_DEL_TXSA,
3394 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3395 .doit = macsec_del_txsa,
3396 .flags = GENL_ADMIN_PERM,
3397 },
3398 {
3399 .cmd = MACSEC_CMD_UPD_TXSA,
3400 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3401 .doit = macsec_upd_txsa,
3402 .flags = GENL_ADMIN_PERM,
3403 },
3404 {
3405 .cmd = MACSEC_CMD_ADD_RXSA,
3406 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3407 .doit = macsec_add_rxsa,
3408 .flags = GENL_ADMIN_PERM,
3409 },
3410 {
3411 .cmd = MACSEC_CMD_DEL_RXSA,
3412 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3413 .doit = macsec_del_rxsa,
3414 .flags = GENL_ADMIN_PERM,
3415 },
3416 {
3417 .cmd = MACSEC_CMD_UPD_RXSA,
3418 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3419 .doit = macsec_upd_rxsa,
3420 .flags = GENL_ADMIN_PERM,
3421 },
3422 {
3423 .cmd = MACSEC_CMD_UPD_OFFLOAD,
3424 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3425 .doit = macsec_upd_offload,
3426 .flags = GENL_ADMIN_PERM,
3427 },
3428};
3429
3430static struct genl_family macsec_fam __ro_after_init = {
3431 .name = MACSEC_GENL_NAME,
3432 .hdrsize = 0,
3433 .version = MACSEC_GENL_VERSION,
3434 .maxattr = MACSEC_ATTR_MAX,
3435 .policy = macsec_genl_policy,
3436 .netnsok = true,
3437 .module = THIS_MODULE,
3438 .small_ops = macsec_genl_ops,
3439 .n_small_ops = ARRAY_SIZE(macsec_genl_ops),
3440 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1,
3441};
3442
3443static struct sk_buff *macsec_insert_tx_tag(struct sk_buff *skb,
3444 struct net_device *dev)
3445{
3446 struct macsec_dev *macsec = macsec_priv(dev);
3447 const struct macsec_ops *ops;
3448 struct phy_device *phydev;
3449 struct macsec_context ctx;
3450 int skb_final_len;
3451 int err;
3452
3453 ops = macsec_get_ops(macsec, &ctx);
3454 skb_final_len = skb->len - ETH_HLEN + ops->needed_headroom +
3455 ops->needed_tailroom;
3456 if (unlikely(skb_final_len > macsec->real_dev->mtu)) {
3457 err = -EINVAL;
3458 goto cleanup;
3459 }
3460
3461 phydev = macsec->real_dev->phydev;
3462
3463 err = skb_ensure_writable_head_tail(skb, dev);
3464 if (unlikely(err < 0))
3465 goto cleanup;
3466
3467 err = ops->mdo_insert_tx_tag(phydev, skb);
3468 if (unlikely(err))
3469 goto cleanup;
3470
3471 return skb;
3472cleanup:
3473 kfree_skb(skb);
3474 return ERR_PTR(err);
3475}
3476
3477static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3478 struct net_device *dev)
3479{
3480 struct macsec_dev *macsec = netdev_priv(dev);
3481 struct macsec_secy *secy = &macsec->secy;
3482 struct pcpu_secy_stats *secy_stats;
3483 int ret, len;
3484
3485 if (macsec_is_offloaded(netdev_priv(dev))) {
3486 struct metadata_dst *md_dst = secy->tx_sc.md_dst;
3487
3488 skb_dst_drop(skb);
3489 dst_hold(&md_dst->dst);
3490 skb_dst_set(skb, &md_dst->dst);
3491
3492 if (macsec->insert_tx_tag) {
3493 skb = macsec_insert_tx_tag(skb, dev);
3494 if (IS_ERR(skb)) {
3495 DEV_STATS_INC(dev, tx_dropped);
3496 return NETDEV_TX_OK;
3497 }
3498 }
3499
3500 skb->dev = macsec->real_dev;
3501 return dev_queue_xmit(skb);
3502 }
3503
3504 /* 10.5 */
3505 if (!secy->protect_frames) {
3506 secy_stats = this_cpu_ptr(macsec->stats);
3507 u64_stats_update_begin(&secy_stats->syncp);
3508 secy_stats->stats.OutPktsUntagged++;
3509 u64_stats_update_end(&secy_stats->syncp);
3510 skb->dev = macsec->real_dev;
3511 len = skb->len;
3512 ret = dev_queue_xmit(skb);
3513 count_tx(dev, ret, len);
3514 return ret;
3515 }
3516
3517 if (!secy->operational) {
3518 kfree_skb(skb);
3519 DEV_STATS_INC(dev, tx_dropped);
3520 return NETDEV_TX_OK;
3521 }
3522
3523 len = skb->len;
3524 skb = macsec_encrypt(skb, dev);
3525 if (IS_ERR(skb)) {
3526 if (PTR_ERR(skb) != -EINPROGRESS)
3527 DEV_STATS_INC(dev, tx_dropped);
3528 return NETDEV_TX_OK;
3529 }
3530
3531 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3532
3533 macsec_encrypt_finish(skb, dev);
3534 ret = dev_queue_xmit(skb);
3535 count_tx(dev, ret, len);
3536 return ret;
3537}
3538
3539#define MACSEC_FEATURES \
3540 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3541
3542static int macsec_dev_init(struct net_device *dev)
3543{
3544 struct macsec_dev *macsec = macsec_priv(dev);
3545 struct net_device *real_dev = macsec->real_dev;
3546 int err;
3547
3548 err = gro_cells_init(&macsec->gro_cells, dev);
3549 if (err)
3550 return err;
3551
3552 dev->features = real_dev->features & MACSEC_FEATURES;
3553 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
3554 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
3555
3556 macsec_set_head_tail_room(dev);
3557
3558 if (is_zero_ether_addr(dev->dev_addr))
3559 eth_hw_addr_inherit(dev, real_dev);
3560 if (is_zero_ether_addr(dev->broadcast))
3561 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3562
3563 /* Get macsec's reference to real_dev */
3564 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL);
3565
3566 return 0;
3567}
3568
3569static void macsec_dev_uninit(struct net_device *dev)
3570{
3571 struct macsec_dev *macsec = macsec_priv(dev);
3572
3573 gro_cells_destroy(&macsec->gro_cells);
3574}
3575
3576static netdev_features_t macsec_fix_features(struct net_device *dev,
3577 netdev_features_t features)
3578{
3579 struct macsec_dev *macsec = macsec_priv(dev);
3580 struct net_device *real_dev = macsec->real_dev;
3581
3582 features &= (real_dev->features & MACSEC_FEATURES) |
3583 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3584 features |= NETIF_F_LLTX;
3585
3586 return features;
3587}
3588
3589static int macsec_dev_open(struct net_device *dev)
3590{
3591 struct macsec_dev *macsec = macsec_priv(dev);
3592 struct net_device *real_dev = macsec->real_dev;
3593 int err;
3594
3595 err = dev_uc_add(real_dev, dev->dev_addr);
3596 if (err < 0)
3597 return err;
3598
3599 if (dev->flags & IFF_ALLMULTI) {
3600 err = dev_set_allmulti(real_dev, 1);
3601 if (err < 0)
3602 goto del_unicast;
3603 }
3604
3605 if (dev->flags & IFF_PROMISC) {
3606 err = dev_set_promiscuity(real_dev, 1);
3607 if (err < 0)
3608 goto clear_allmulti;
3609 }
3610
3611 /* If h/w offloading is available, propagate to the device */
3612 if (macsec_is_offloaded(macsec)) {
3613 const struct macsec_ops *ops;
3614 struct macsec_context ctx;
3615
3616 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3617 if (!ops) {
3618 err = -EOPNOTSUPP;
3619 goto clear_allmulti;
3620 }
3621
3622 ctx.secy = &macsec->secy;
3623 err = macsec_offload(ops->mdo_dev_open, &ctx);
3624 if (err)
3625 goto clear_allmulti;
3626 }
3627
3628 if (netif_carrier_ok(real_dev))
3629 netif_carrier_on(dev);
3630
3631 return 0;
3632clear_allmulti:
3633 if (dev->flags & IFF_ALLMULTI)
3634 dev_set_allmulti(real_dev, -1);
3635del_unicast:
3636 dev_uc_del(real_dev, dev->dev_addr);
3637 netif_carrier_off(dev);
3638 return err;
3639}
3640
3641static int macsec_dev_stop(struct net_device *dev)
3642{
3643 struct macsec_dev *macsec = macsec_priv(dev);
3644 struct net_device *real_dev = macsec->real_dev;
3645
3646 netif_carrier_off(dev);
3647
3648 /* If h/w offloading is available, propagate to the device */
3649 if (macsec_is_offloaded(macsec)) {
3650 const struct macsec_ops *ops;
3651 struct macsec_context ctx;
3652
3653 ops = macsec_get_ops(macsec, &ctx);
3654 if (ops) {
3655 ctx.secy = &macsec->secy;
3656 macsec_offload(ops->mdo_dev_stop, &ctx);
3657 }
3658 }
3659
3660 dev_mc_unsync(real_dev, dev);
3661 dev_uc_unsync(real_dev, dev);
3662
3663 if (dev->flags & IFF_ALLMULTI)
3664 dev_set_allmulti(real_dev, -1);
3665
3666 if (dev->flags & IFF_PROMISC)
3667 dev_set_promiscuity(real_dev, -1);
3668
3669 dev_uc_del(real_dev, dev->dev_addr);
3670
3671 return 0;
3672}
3673
3674static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3675{
3676 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3677
3678 if (!(dev->flags & IFF_UP))
3679 return;
3680
3681 if (change & IFF_ALLMULTI)
3682 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3683
3684 if (change & IFF_PROMISC)
3685 dev_set_promiscuity(real_dev,
3686 dev->flags & IFF_PROMISC ? 1 : -1);
3687}
3688
3689static void macsec_dev_set_rx_mode(struct net_device *dev)
3690{
3691 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3692
3693 dev_mc_sync(real_dev, dev);
3694 dev_uc_sync(real_dev, dev);
3695}
3696
3697static int macsec_set_mac_address(struct net_device *dev, void *p)
3698{
3699 struct macsec_dev *macsec = macsec_priv(dev);
3700 struct net_device *real_dev = macsec->real_dev;
3701 struct sockaddr *addr = p;
3702 u8 old_addr[ETH_ALEN];
3703 int err;
3704
3705 if (!is_valid_ether_addr(addr->sa_data))
3706 return -EADDRNOTAVAIL;
3707
3708 if (dev->flags & IFF_UP) {
3709 err = dev_uc_add(real_dev, addr->sa_data);
3710 if (err < 0)
3711 return err;
3712 }
3713
3714 ether_addr_copy(old_addr, dev->dev_addr);
3715 eth_hw_addr_set(dev, addr->sa_data);
3716
3717 /* If h/w offloading is available, propagate to the device */
3718 if (macsec_is_offloaded(macsec)) {
3719 const struct macsec_ops *ops;
3720 struct macsec_context ctx;
3721
3722 ops = macsec_get_ops(macsec, &ctx);
3723 if (!ops) {
3724 err = -EOPNOTSUPP;
3725 goto restore_old_addr;
3726 }
3727
3728 ctx.secy = &macsec->secy;
3729 err = macsec_offload(ops->mdo_upd_secy, &ctx);
3730 if (err)
3731 goto restore_old_addr;
3732 }
3733
3734 if (dev->flags & IFF_UP)
3735 dev_uc_del(real_dev, old_addr);
3736
3737 return 0;
3738
3739restore_old_addr:
3740 if (dev->flags & IFF_UP)
3741 dev_uc_del(real_dev, addr->sa_data);
3742
3743 eth_hw_addr_set(dev, old_addr);
3744
3745 return err;
3746}
3747
3748static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3749{
3750 struct macsec_dev *macsec = macsec_priv(dev);
3751 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3752
3753 if (macsec->real_dev->mtu - extra < new_mtu)
3754 return -ERANGE;
3755
3756 dev->mtu = new_mtu;
3757
3758 return 0;
3759}
3760
3761static void macsec_get_stats64(struct net_device *dev,
3762 struct rtnl_link_stats64 *s)
3763{
3764 if (!dev->tstats)
3765 return;
3766
3767 dev_fetch_sw_netstats(s, dev->tstats);
3768
3769 s->rx_dropped = DEV_STATS_READ(dev, rx_dropped);
3770 s->tx_dropped = DEV_STATS_READ(dev, tx_dropped);
3771 s->rx_errors = DEV_STATS_READ(dev, rx_errors);
3772}
3773
3774static int macsec_get_iflink(const struct net_device *dev)
3775{
3776 return READ_ONCE(macsec_priv(dev)->real_dev->ifindex);
3777}
3778
3779static const struct net_device_ops macsec_netdev_ops = {
3780 .ndo_init = macsec_dev_init,
3781 .ndo_uninit = macsec_dev_uninit,
3782 .ndo_open = macsec_dev_open,
3783 .ndo_stop = macsec_dev_stop,
3784 .ndo_fix_features = macsec_fix_features,
3785 .ndo_change_mtu = macsec_change_mtu,
3786 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
3787 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
3788 .ndo_set_mac_address = macsec_set_mac_address,
3789 .ndo_start_xmit = macsec_start_xmit,
3790 .ndo_get_stats64 = macsec_get_stats64,
3791 .ndo_get_iflink = macsec_get_iflink,
3792};
3793
3794static const struct device_type macsec_type = {
3795 .name = "macsec",
3796};
3797
3798static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3799 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3800 [IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3801 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3802 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3803 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3804 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3805 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3806 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3807 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3808 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3809 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3810 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3811 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3812 [IFLA_MACSEC_OFFLOAD] = { .type = NLA_U8 },
3813};
3814
3815static void macsec_free_netdev(struct net_device *dev)
3816{
3817 struct macsec_dev *macsec = macsec_priv(dev);
3818
3819 if (macsec->secy.tx_sc.md_dst)
3820 metadata_dst_free(macsec->secy.tx_sc.md_dst);
3821 free_percpu(macsec->stats);
3822 free_percpu(macsec->secy.tx_sc.stats);
3823
3824 /* Get rid of the macsec's reference to real_dev */
3825 netdev_put(macsec->real_dev, &macsec->dev_tracker);
3826}
3827
3828static void macsec_setup(struct net_device *dev)
3829{
3830 ether_setup(dev);
3831 dev->min_mtu = 0;
3832 dev->max_mtu = ETH_MAX_MTU;
3833 dev->priv_flags |= IFF_NO_QUEUE;
3834 dev->netdev_ops = &macsec_netdev_ops;
3835 dev->needs_free_netdev = true;
3836 dev->priv_destructor = macsec_free_netdev;
3837 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3838
3839 eth_zero_addr(dev->broadcast);
3840}
3841
3842static int macsec_changelink_common(struct net_device *dev,
3843 struct nlattr *data[])
3844{
3845 struct macsec_secy *secy;
3846 struct macsec_tx_sc *tx_sc;
3847
3848 secy = &macsec_priv(dev)->secy;
3849 tx_sc = &secy->tx_sc;
3850
3851 if (data[IFLA_MACSEC_ENCODING_SA]) {
3852 struct macsec_tx_sa *tx_sa;
3853
3854 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3855 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3856
3857 secy->operational = tx_sa && tx_sa->active;
3858 }
3859
3860 if (data[IFLA_MACSEC_ENCRYPT])
3861 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3862
3863 if (data[IFLA_MACSEC_PROTECT])
3864 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3865
3866 if (data[IFLA_MACSEC_INC_SCI])
3867 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3868
3869 if (data[IFLA_MACSEC_ES])
3870 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3871
3872 if (data[IFLA_MACSEC_SCB])
3873 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3874
3875 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3876 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3877
3878 if (data[IFLA_MACSEC_VALIDATION])
3879 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3880
3881 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3882 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3883 case MACSEC_CIPHER_ID_GCM_AES_128:
3884 case MACSEC_DEFAULT_CIPHER_ID:
3885 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3886 secy->xpn = false;
3887 break;
3888 case MACSEC_CIPHER_ID_GCM_AES_256:
3889 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3890 secy->xpn = false;
3891 break;
3892 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
3893 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3894 secy->xpn = true;
3895 break;
3896 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
3897 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3898 secy->xpn = true;
3899 break;
3900 default:
3901 return -EINVAL;
3902 }
3903 }
3904
3905 if (data[IFLA_MACSEC_WINDOW]) {
3906 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3907
3908 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window
3909 * for XPN cipher suites */
3910 if (secy->xpn &&
3911 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW)
3912 return -EINVAL;
3913 }
3914
3915 return 0;
3916}
3917
3918static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3919 struct nlattr *data[],
3920 struct netlink_ext_ack *extack)
3921{
3922 struct macsec_dev *macsec = macsec_priv(dev);
3923 bool macsec_offload_state_change = false;
3924 enum macsec_offload offload;
3925 struct macsec_tx_sc tx_sc;
3926 struct macsec_secy secy;
3927 int ret;
3928
3929 if (!data)
3930 return 0;
3931
3932 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3933 data[IFLA_MACSEC_ICV_LEN] ||
3934 data[IFLA_MACSEC_SCI] ||
3935 data[IFLA_MACSEC_PORT])
3936 return -EINVAL;
3937
3938 /* Keep a copy of unmodified secy and tx_sc, in case the offload
3939 * propagation fails, to revert macsec_changelink_common.
3940 */
3941 memcpy(&secy, &macsec->secy, sizeof(secy));
3942 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3943
3944 ret = macsec_changelink_common(dev, data);
3945 if (ret)
3946 goto cleanup;
3947
3948 if (data[IFLA_MACSEC_OFFLOAD]) {
3949 offload = nla_get_u8(data[IFLA_MACSEC_OFFLOAD]);
3950 if (macsec->offload != offload) {
3951 macsec_offload_state_change = true;
3952 ret = macsec_update_offload(dev, offload);
3953 if (ret)
3954 goto cleanup;
3955 }
3956 }
3957
3958 /* If h/w offloading is available, propagate to the device */
3959 if (!macsec_offload_state_change && macsec_is_offloaded(macsec)) {
3960 const struct macsec_ops *ops;
3961 struct macsec_context ctx;
3962
3963 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3964 if (!ops) {
3965 ret = -EOPNOTSUPP;
3966 goto cleanup;
3967 }
3968
3969 ctx.secy = &macsec->secy;
3970 ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3971 if (ret)
3972 goto cleanup;
3973 }
3974
3975 return 0;
3976
3977cleanup:
3978 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3979 memcpy(&macsec->secy, &secy, sizeof(secy));
3980
3981 return ret;
3982}
3983
3984static void macsec_del_dev(struct macsec_dev *macsec)
3985{
3986 int i;
3987
3988 while (macsec->secy.rx_sc) {
3989 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3990
3991 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3992 free_rx_sc(rx_sc);
3993 }
3994
3995 for (i = 0; i < MACSEC_NUM_AN; i++) {
3996 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3997
3998 if (sa) {
3999 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
4000 clear_tx_sa(sa);
4001 }
4002 }
4003}
4004
4005static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
4006{
4007 struct macsec_dev *macsec = macsec_priv(dev);
4008 struct net_device *real_dev = macsec->real_dev;
4009
4010 /* If h/w offloading is available, propagate to the device */
4011 if (macsec_is_offloaded(macsec)) {
4012 const struct macsec_ops *ops;
4013 struct macsec_context ctx;
4014
4015 ops = macsec_get_ops(netdev_priv(dev), &ctx);
4016 if (ops) {
4017 ctx.secy = &macsec->secy;
4018 macsec_offload(ops->mdo_del_secy, &ctx);
4019 }
4020 }
4021
4022 unregister_netdevice_queue(dev, head);
4023 list_del_rcu(&macsec->secys);
4024 macsec_del_dev(macsec);
4025 netdev_upper_dev_unlink(real_dev, dev);
4026
4027 macsec_generation++;
4028}
4029
4030static void macsec_dellink(struct net_device *dev, struct list_head *head)
4031{
4032 struct macsec_dev *macsec = macsec_priv(dev);
4033 struct net_device *real_dev = macsec->real_dev;
4034 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
4035
4036 macsec_common_dellink(dev, head);
4037
4038 if (list_empty(&rxd->secys)) {
4039 netdev_rx_handler_unregister(real_dev);
4040 kfree(rxd);
4041 }
4042}
4043
4044static int register_macsec_dev(struct net_device *real_dev,
4045 struct net_device *dev)
4046{
4047 struct macsec_dev *macsec = macsec_priv(dev);
4048 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
4049
4050 if (!rxd) {
4051 int err;
4052
4053 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
4054 if (!rxd)
4055 return -ENOMEM;
4056
4057 INIT_LIST_HEAD(&rxd->secys);
4058
4059 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
4060 rxd);
4061 if (err < 0) {
4062 kfree(rxd);
4063 return err;
4064 }
4065 }
4066
4067 list_add_tail_rcu(&macsec->secys, &rxd->secys);
4068 return 0;
4069}
4070
4071static bool sci_exists(struct net_device *dev, sci_t sci)
4072{
4073 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
4074 struct macsec_dev *macsec;
4075
4076 list_for_each_entry(macsec, &rxd->secys, secys) {
4077 if (macsec->secy.sci == sci)
4078 return true;
4079 }
4080
4081 return false;
4082}
4083
4084static sci_t dev_to_sci(struct net_device *dev, __be16 port)
4085{
4086 return make_sci(dev->dev_addr, port);
4087}
4088
4089static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
4090{
4091 struct macsec_dev *macsec = macsec_priv(dev);
4092 struct macsec_secy *secy = &macsec->secy;
4093
4094 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
4095 if (!macsec->stats)
4096 return -ENOMEM;
4097
4098 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
4099 if (!secy->tx_sc.stats)
4100 return -ENOMEM;
4101
4102 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL);
4103 if (!secy->tx_sc.md_dst)
4104 /* macsec and secy percpu stats will be freed when unregistering
4105 * net_device in macsec_free_netdev()
4106 */
4107 return -ENOMEM;
4108
4109 if (sci == MACSEC_UNDEF_SCI)
4110 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4111
4112 secy->netdev = dev;
4113 secy->operational = true;
4114 secy->key_len = DEFAULT_SAK_LEN;
4115 secy->icv_len = icv_len;
4116 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
4117 secy->protect_frames = true;
4118 secy->replay_protect = false;
4119 secy->xpn = DEFAULT_XPN;
4120
4121 secy->sci = sci;
4122 secy->tx_sc.md_dst->u.macsec_info.sci = sci;
4123 secy->tx_sc.active = true;
4124 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
4125 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
4126 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
4127 secy->tx_sc.end_station = false;
4128 secy->tx_sc.scb = false;
4129
4130 return 0;
4131}
4132
4133static struct lock_class_key macsec_netdev_addr_lock_key;
4134
4135static int macsec_newlink(struct net *net, struct net_device *dev,
4136 struct nlattr *tb[], struct nlattr *data[],
4137 struct netlink_ext_ack *extack)
4138{
4139 struct macsec_dev *macsec = macsec_priv(dev);
4140 rx_handler_func_t *rx_handler;
4141 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4142 struct net_device *real_dev;
4143 int err, mtu;
4144 sci_t sci;
4145
4146 if (!tb[IFLA_LINK])
4147 return -EINVAL;
4148 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
4149 if (!real_dev)
4150 return -ENODEV;
4151 if (real_dev->type != ARPHRD_ETHER)
4152 return -EINVAL;
4153
4154 dev->priv_flags |= IFF_MACSEC;
4155
4156 macsec->real_dev = real_dev;
4157
4158 if (data && data[IFLA_MACSEC_OFFLOAD])
4159 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
4160 else
4161 /* MACsec offloading is off by default */
4162 macsec->offload = MACSEC_OFFLOAD_OFF;
4163
4164 /* Check if the offloading mode is supported by the underlying layers */
4165 if (macsec->offload != MACSEC_OFFLOAD_OFF &&
4166 !macsec_check_offload(macsec->offload, macsec))
4167 return -EOPNOTSUPP;
4168
4169 /* send_sci must be set to true when transmit sci explicitly is set */
4170 if ((data && data[IFLA_MACSEC_SCI]) &&
4171 (data && data[IFLA_MACSEC_INC_SCI])) {
4172 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
4173
4174 if (!send_sci)
4175 return -EINVAL;
4176 }
4177
4178 if (data && data[IFLA_MACSEC_ICV_LEN])
4179 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4180 mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
4181 if (mtu < 0)
4182 dev->mtu = 0;
4183 else
4184 dev->mtu = mtu;
4185
4186 rx_handler = rtnl_dereference(real_dev->rx_handler);
4187 if (rx_handler && rx_handler != macsec_handle_frame)
4188 return -EBUSY;
4189
4190 err = register_netdevice(dev);
4191 if (err < 0)
4192 return err;
4193
4194 netdev_lockdep_set_classes(dev);
4195 lockdep_set_class(&dev->addr_list_lock,
4196 &macsec_netdev_addr_lock_key);
4197
4198 err = netdev_upper_dev_link(real_dev, dev, extack);
4199 if (err < 0)
4200 goto unregister;
4201
4202 /* need to be already registered so that ->init has run and
4203 * the MAC addr is set
4204 */
4205 if (data && data[IFLA_MACSEC_SCI])
4206 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
4207 else if (data && data[IFLA_MACSEC_PORT])
4208 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
4209 else
4210 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4211
4212 if (rx_handler && sci_exists(real_dev, sci)) {
4213 err = -EBUSY;
4214 goto unlink;
4215 }
4216
4217 err = macsec_add_dev(dev, sci, icv_len);
4218 if (err)
4219 goto unlink;
4220
4221 if (data) {
4222 err = macsec_changelink_common(dev, data);
4223 if (err)
4224 goto del_dev;
4225 }
4226
4227 /* If h/w offloading is available, propagate to the device */
4228 if (macsec_is_offloaded(macsec)) {
4229 const struct macsec_ops *ops;
4230 struct macsec_context ctx;
4231
4232 ops = macsec_get_ops(macsec, &ctx);
4233 if (ops) {
4234 ctx.secy = &macsec->secy;
4235 err = macsec_offload(ops->mdo_add_secy, &ctx);
4236 if (err)
4237 goto del_dev;
4238
4239 macsec->insert_tx_tag =
4240 macsec_needs_tx_tag(macsec, ops);
4241 }
4242 }
4243
4244 err = register_macsec_dev(real_dev, dev);
4245 if (err < 0)
4246 goto del_dev;
4247
4248 netif_stacked_transfer_operstate(real_dev, dev);
4249 linkwatch_fire_event(dev);
4250
4251 macsec_generation++;
4252
4253 return 0;
4254
4255del_dev:
4256 macsec_del_dev(macsec);
4257unlink:
4258 netdev_upper_dev_unlink(real_dev, dev);
4259unregister:
4260 unregister_netdevice(dev);
4261 return err;
4262}
4263
4264static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
4265 struct netlink_ext_ack *extack)
4266{
4267 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
4268 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4269 int flag;
4270 bool es, scb, sci;
4271
4272 if (!data)
4273 return 0;
4274
4275 if (data[IFLA_MACSEC_CIPHER_SUITE])
4276 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
4277
4278 if (data[IFLA_MACSEC_ICV_LEN]) {
4279 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4280 if (icv_len != MACSEC_DEFAULT_ICV_LEN) {
4281 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
4282 struct crypto_aead *dummy_tfm;
4283
4284 dummy_tfm = macsec_alloc_tfm(dummy_key,
4285 DEFAULT_SAK_LEN,
4286 icv_len);
4287 if (IS_ERR(dummy_tfm))
4288 return PTR_ERR(dummy_tfm);
4289 crypto_free_aead(dummy_tfm);
4290 }
4291 }
4292
4293 switch (csid) {
4294 case MACSEC_CIPHER_ID_GCM_AES_128:
4295 case MACSEC_CIPHER_ID_GCM_AES_256:
4296 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
4297 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
4298 case MACSEC_DEFAULT_CIPHER_ID:
4299 if (icv_len < MACSEC_MIN_ICV_LEN ||
4300 icv_len > MACSEC_STD_ICV_LEN)
4301 return -EINVAL;
4302 break;
4303 default:
4304 return -EINVAL;
4305 }
4306
4307 if (data[IFLA_MACSEC_ENCODING_SA]) {
4308 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
4309 return -EINVAL;
4310 }
4311
4312 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
4313 flag < IFLA_MACSEC_VALIDATION;
4314 flag++) {
4315 if (data[flag]) {
4316 if (nla_get_u8(data[flag]) > 1)
4317 return -EINVAL;
4318 }
4319 }
4320
4321 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
4322 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
4323 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
4324
4325 if ((sci && (scb || es)) || (scb && es))
4326 return -EINVAL;
4327
4328 if (data[IFLA_MACSEC_VALIDATION] &&
4329 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
4330 return -EINVAL;
4331
4332 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
4333 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
4334 !data[IFLA_MACSEC_WINDOW])
4335 return -EINVAL;
4336
4337 return 0;
4338}
4339
4340static struct net *macsec_get_link_net(const struct net_device *dev)
4341{
4342 return dev_net(macsec_priv(dev)->real_dev);
4343}
4344
4345struct net_device *macsec_get_real_dev(const struct net_device *dev)
4346{
4347 return macsec_priv(dev)->real_dev;
4348}
4349EXPORT_SYMBOL_GPL(macsec_get_real_dev);
4350
4351bool macsec_netdev_is_offloaded(struct net_device *dev)
4352{
4353 return macsec_is_offloaded(macsec_priv(dev));
4354}
4355EXPORT_SYMBOL_GPL(macsec_netdev_is_offloaded);
4356
4357static size_t macsec_get_size(const struct net_device *dev)
4358{
4359 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
4360 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
4361 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
4362 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
4363 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
4364 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
4365 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
4366 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
4367 nla_total_size(1) + /* IFLA_MACSEC_ES */
4368 nla_total_size(1) + /* IFLA_MACSEC_SCB */
4369 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
4370 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
4371 nla_total_size(1) + /* IFLA_MACSEC_OFFLOAD */
4372 0;
4373}
4374
4375static int macsec_fill_info(struct sk_buff *skb,
4376 const struct net_device *dev)
4377{
4378 struct macsec_tx_sc *tx_sc;
4379 struct macsec_dev *macsec;
4380 struct macsec_secy *secy;
4381 u64 csid;
4382
4383 macsec = macsec_priv(dev);
4384 secy = &macsec->secy;
4385 tx_sc = &secy->tx_sc;
4386
4387 switch (secy->key_len) {
4388 case MACSEC_GCM_AES_128_SAK_LEN:
4389 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
4390 break;
4391 case MACSEC_GCM_AES_256_SAK_LEN:
4392 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
4393 break;
4394 default:
4395 goto nla_put_failure;
4396 }
4397
4398 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
4399 IFLA_MACSEC_PAD) ||
4400 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
4401 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
4402 csid, IFLA_MACSEC_PAD) ||
4403 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
4404 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
4405 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
4406 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
4407 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
4408 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
4409 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
4410 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
4411 nla_put_u8(skb, IFLA_MACSEC_OFFLOAD, macsec->offload) ||
4412 0)
4413 goto nla_put_failure;
4414
4415 if (secy->replay_protect) {
4416 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
4417 goto nla_put_failure;
4418 }
4419
4420 return 0;
4421
4422nla_put_failure:
4423 return -EMSGSIZE;
4424}
4425
4426static struct rtnl_link_ops macsec_link_ops __read_mostly = {
4427 .kind = "macsec",
4428 .priv_size = sizeof(struct macsec_dev),
4429 .maxtype = IFLA_MACSEC_MAX,
4430 .policy = macsec_rtnl_policy,
4431 .setup = macsec_setup,
4432 .validate = macsec_validate_attr,
4433 .newlink = macsec_newlink,
4434 .changelink = macsec_changelink,
4435 .dellink = macsec_dellink,
4436 .get_size = macsec_get_size,
4437 .fill_info = macsec_fill_info,
4438 .get_link_net = macsec_get_link_net,
4439};
4440
4441static bool is_macsec_master(struct net_device *dev)
4442{
4443 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
4444}
4445
4446static int macsec_notify(struct notifier_block *this, unsigned long event,
4447 void *ptr)
4448{
4449 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
4450 LIST_HEAD(head);
4451
4452 if (!is_macsec_master(real_dev))
4453 return NOTIFY_DONE;
4454
4455 switch (event) {
4456 case NETDEV_DOWN:
4457 case NETDEV_UP:
4458 case NETDEV_CHANGE: {
4459 struct macsec_dev *m, *n;
4460 struct macsec_rxh_data *rxd;
4461
4462 rxd = macsec_data_rtnl(real_dev);
4463 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4464 struct net_device *dev = m->secy.netdev;
4465
4466 netif_stacked_transfer_operstate(real_dev, dev);
4467 }
4468 break;
4469 }
4470 case NETDEV_UNREGISTER: {
4471 struct macsec_dev *m, *n;
4472 struct macsec_rxh_data *rxd;
4473
4474 rxd = macsec_data_rtnl(real_dev);
4475 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4476 macsec_common_dellink(m->secy.netdev, &head);
4477 }
4478
4479 netdev_rx_handler_unregister(real_dev);
4480 kfree(rxd);
4481
4482 unregister_netdevice_many(&head);
4483 break;
4484 }
4485 case NETDEV_CHANGEMTU: {
4486 struct macsec_dev *m;
4487 struct macsec_rxh_data *rxd;
4488
4489 rxd = macsec_data_rtnl(real_dev);
4490 list_for_each_entry(m, &rxd->secys, secys) {
4491 struct net_device *dev = m->secy.netdev;
4492 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
4493 macsec_extra_len(true));
4494
4495 if (dev->mtu > mtu)
4496 dev_set_mtu(dev, mtu);
4497 }
4498 }
4499 }
4500
4501 return NOTIFY_OK;
4502}
4503
4504static struct notifier_block macsec_notifier = {
4505 .notifier_call = macsec_notify,
4506};
4507
4508static int __init macsec_init(void)
4509{
4510 int err;
4511
4512 pr_info("MACsec IEEE 802.1AE\n");
4513 err = register_netdevice_notifier(&macsec_notifier);
4514 if (err)
4515 return err;
4516
4517 err = rtnl_link_register(&macsec_link_ops);
4518 if (err)
4519 goto notifier;
4520
4521 err = genl_register_family(&macsec_fam);
4522 if (err)
4523 goto rtnl;
4524
4525 return 0;
4526
4527rtnl:
4528 rtnl_link_unregister(&macsec_link_ops);
4529notifier:
4530 unregister_netdevice_notifier(&macsec_notifier);
4531 return err;
4532}
4533
4534static void __exit macsec_exit(void)
4535{
4536 genl_unregister_family(&macsec_fam);
4537 rtnl_link_unregister(&macsec_link_ops);
4538 unregister_netdevice_notifier(&macsec_notifier);
4539 rcu_barrier();
4540}
4541
4542module_init(macsec_init);
4543module_exit(macsec_exit);
4544
4545MODULE_ALIAS_RTNL_LINK("macsec");
4546MODULE_ALIAS_GENL_FAMILY("macsec");
4547
4548MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
4549MODULE_LICENSE("GPL v2");
1/*
2 * drivers/net/macsec.c - MACsec device
3 *
4 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <linux/types.h>
13#include <linux/skbuff.h>
14#include <linux/socket.h>
15#include <linux/module.h>
16#include <crypto/aead.h>
17#include <linux/etherdevice.h>
18#include <linux/rtnetlink.h>
19#include <net/genetlink.h>
20#include <net/sock.h>
21
22#include <uapi/linux/if_macsec.h>
23
24typedef u64 __bitwise sci_t;
25
26#define MACSEC_SCI_LEN 8
27
28/* SecTAG length = macsec_eth_header without the optional SCI */
29#define MACSEC_TAG_LEN 6
30
31struct macsec_eth_header {
32 struct ethhdr eth;
33 /* SecTAG */
34 u8 tci_an;
35#if defined(__LITTLE_ENDIAN_BITFIELD)
36 u8 short_length:6,
37 unused:2;
38#elif defined(__BIG_ENDIAN_BITFIELD)
39 u8 unused:2,
40 short_length:6;
41#else
42#error "Please fix <asm/byteorder.h>"
43#endif
44 __be32 packet_number;
45 u8 secure_channel_id[8]; /* optional */
46} __packed;
47
48#define MACSEC_TCI_VERSION 0x80
49#define MACSEC_TCI_ES 0x40 /* end station */
50#define MACSEC_TCI_SC 0x20 /* SCI present */
51#define MACSEC_TCI_SCB 0x10 /* epon */
52#define MACSEC_TCI_E 0x08 /* encryption */
53#define MACSEC_TCI_C 0x04 /* changed text */
54#define MACSEC_AN_MASK 0x03 /* association number */
55#define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
56
57/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
58#define MIN_NON_SHORT_LEN 48
59
60#define GCM_AES_IV_LEN 12
61#define DEFAULT_ICV_LEN 16
62
63#define MACSEC_NUM_AN 4 /* 2 bits for the association number */
64
65#define for_each_rxsc(secy, sc) \
66 for (sc = rcu_dereference_bh(secy->rx_sc); \
67 sc; \
68 sc = rcu_dereference_bh(sc->next))
69#define for_each_rxsc_rtnl(secy, sc) \
70 for (sc = rtnl_dereference(secy->rx_sc); \
71 sc; \
72 sc = rtnl_dereference(sc->next))
73
74struct gcm_iv {
75 union {
76 u8 secure_channel_id[8];
77 sci_t sci;
78 };
79 __be32 pn;
80};
81
82/**
83 * struct macsec_key - SA key
84 * @id: user-provided key identifier
85 * @tfm: crypto struct, key storage
86 */
87struct macsec_key {
88 u8 id[MACSEC_KEYID_LEN];
89 struct crypto_aead *tfm;
90};
91
92struct macsec_rx_sc_stats {
93 __u64 InOctetsValidated;
94 __u64 InOctetsDecrypted;
95 __u64 InPktsUnchecked;
96 __u64 InPktsDelayed;
97 __u64 InPktsOK;
98 __u64 InPktsInvalid;
99 __u64 InPktsLate;
100 __u64 InPktsNotValid;
101 __u64 InPktsNotUsingSA;
102 __u64 InPktsUnusedSA;
103};
104
105struct macsec_rx_sa_stats {
106 __u32 InPktsOK;
107 __u32 InPktsInvalid;
108 __u32 InPktsNotValid;
109 __u32 InPktsNotUsingSA;
110 __u32 InPktsUnusedSA;
111};
112
113struct macsec_tx_sa_stats {
114 __u32 OutPktsProtected;
115 __u32 OutPktsEncrypted;
116};
117
118struct macsec_tx_sc_stats {
119 __u64 OutPktsProtected;
120 __u64 OutPktsEncrypted;
121 __u64 OutOctetsProtected;
122 __u64 OutOctetsEncrypted;
123};
124
125struct macsec_dev_stats {
126 __u64 OutPktsUntagged;
127 __u64 InPktsUntagged;
128 __u64 OutPktsTooLong;
129 __u64 InPktsNoTag;
130 __u64 InPktsBadTag;
131 __u64 InPktsUnknownSCI;
132 __u64 InPktsNoSCI;
133 __u64 InPktsOverrun;
134};
135
136/**
137 * struct macsec_rx_sa - receive secure association
138 * @active:
139 * @next_pn: packet number expected for the next packet
140 * @lock: protects next_pn manipulations
141 * @key: key structure
142 * @stats: per-SA stats
143 */
144struct macsec_rx_sa {
145 struct macsec_key key;
146 spinlock_t lock;
147 u32 next_pn;
148 atomic_t refcnt;
149 bool active;
150 struct macsec_rx_sa_stats __percpu *stats;
151 struct macsec_rx_sc *sc;
152 struct rcu_head rcu;
153};
154
155struct pcpu_rx_sc_stats {
156 struct macsec_rx_sc_stats stats;
157 struct u64_stats_sync syncp;
158};
159
160/**
161 * struct macsec_rx_sc - receive secure channel
162 * @sci: secure channel identifier for this SC
163 * @active: channel is active
164 * @sa: array of secure associations
165 * @stats: per-SC stats
166 */
167struct macsec_rx_sc {
168 struct macsec_rx_sc __rcu *next;
169 sci_t sci;
170 bool active;
171 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN];
172 struct pcpu_rx_sc_stats __percpu *stats;
173 atomic_t refcnt;
174 struct rcu_head rcu_head;
175};
176
177/**
178 * struct macsec_tx_sa - transmit secure association
179 * @active:
180 * @next_pn: packet number to use for the next packet
181 * @lock: protects next_pn manipulations
182 * @key: key structure
183 * @stats: per-SA stats
184 */
185struct macsec_tx_sa {
186 struct macsec_key key;
187 spinlock_t lock;
188 u32 next_pn;
189 atomic_t refcnt;
190 bool active;
191 struct macsec_tx_sa_stats __percpu *stats;
192 struct rcu_head rcu;
193};
194
195struct pcpu_tx_sc_stats {
196 struct macsec_tx_sc_stats stats;
197 struct u64_stats_sync syncp;
198};
199
200/**
201 * struct macsec_tx_sc - transmit secure channel
202 * @active:
203 * @encoding_sa: association number of the SA currently in use
204 * @encrypt: encrypt packets on transmit, or authenticate only
205 * @send_sci: always include the SCI in the SecTAG
206 * @end_station:
207 * @scb: single copy broadcast flag
208 * @sa: array of secure associations
209 * @stats: stats for this TXSC
210 */
211struct macsec_tx_sc {
212 bool active;
213 u8 encoding_sa;
214 bool encrypt;
215 bool send_sci;
216 bool end_station;
217 bool scb;
218 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN];
219 struct pcpu_tx_sc_stats __percpu *stats;
220};
221
222#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
223
224/**
225 * struct macsec_secy - MACsec Security Entity
226 * @netdev: netdevice for this SecY
227 * @n_rx_sc: number of receive secure channels configured on this SecY
228 * @sci: secure channel identifier used for tx
229 * @key_len: length of keys used by the cipher suite
230 * @icv_len: length of ICV used by the cipher suite
231 * @validate_frames: validation mode
232 * @operational: MAC_Operational flag
233 * @protect_frames: enable protection for this SecY
234 * @replay_protect: enable packet number checks on receive
235 * @replay_window: size of the replay window
236 * @tx_sc: transmit secure channel
237 * @rx_sc: linked list of receive secure channels
238 */
239struct macsec_secy {
240 struct net_device *netdev;
241 unsigned int n_rx_sc;
242 sci_t sci;
243 u16 key_len;
244 u16 icv_len;
245 enum macsec_validation_type validate_frames;
246 bool operational;
247 bool protect_frames;
248 bool replay_protect;
249 u32 replay_window;
250 struct macsec_tx_sc tx_sc;
251 struct macsec_rx_sc __rcu *rx_sc;
252};
253
254struct pcpu_secy_stats {
255 struct macsec_dev_stats stats;
256 struct u64_stats_sync syncp;
257};
258
259/**
260 * struct macsec_dev - private data
261 * @secy: SecY config
262 * @real_dev: pointer to underlying netdevice
263 * @stats: MACsec device stats
264 * @secys: linked list of SecY's on the underlying device
265 */
266struct macsec_dev {
267 struct macsec_secy secy;
268 struct net_device *real_dev;
269 struct pcpu_secy_stats __percpu *stats;
270 struct list_head secys;
271};
272
273/**
274 * struct macsec_rxh_data - rx_handler private argument
275 * @secys: linked list of SecY's on this underlying device
276 */
277struct macsec_rxh_data {
278 struct list_head secys;
279};
280
281static struct macsec_dev *macsec_priv(const struct net_device *dev)
282{
283 return (struct macsec_dev *)netdev_priv(dev);
284}
285
286static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
287{
288 return rcu_dereference_bh(dev->rx_handler_data);
289}
290
291static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
292{
293 return rtnl_dereference(dev->rx_handler_data);
294}
295
296struct macsec_cb {
297 struct aead_request *req;
298 union {
299 struct macsec_tx_sa *tx_sa;
300 struct macsec_rx_sa *rx_sa;
301 };
302 u8 assoc_num;
303 bool valid;
304 bool has_sci;
305};
306
307static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
308{
309 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
310
311 if (!sa || !sa->active)
312 return NULL;
313
314 if (!atomic_inc_not_zero(&sa->refcnt))
315 return NULL;
316
317 return sa;
318}
319
320static void free_rx_sc_rcu(struct rcu_head *head)
321{
322 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
323
324 free_percpu(rx_sc->stats);
325 kfree(rx_sc);
326}
327
328static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
329{
330 return atomic_inc_not_zero(&sc->refcnt) ? sc : NULL;
331}
332
333static void macsec_rxsc_put(struct macsec_rx_sc *sc)
334{
335 if (atomic_dec_and_test(&sc->refcnt))
336 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
337}
338
339static void free_rxsa(struct rcu_head *head)
340{
341 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
342
343 crypto_free_aead(sa->key.tfm);
344 free_percpu(sa->stats);
345 macsec_rxsc_put(sa->sc);
346 kfree(sa);
347}
348
349static void macsec_rxsa_put(struct macsec_rx_sa *sa)
350{
351 if (atomic_dec_and_test(&sa->refcnt))
352 call_rcu(&sa->rcu, free_rxsa);
353}
354
355static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
356{
357 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
358
359 if (!sa || !sa->active)
360 return NULL;
361
362 if (!atomic_inc_not_zero(&sa->refcnt))
363 return NULL;
364
365 return sa;
366}
367
368static void free_txsa(struct rcu_head *head)
369{
370 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
371
372 crypto_free_aead(sa->key.tfm);
373 free_percpu(sa->stats);
374 kfree(sa);
375}
376
377static void macsec_txsa_put(struct macsec_tx_sa *sa)
378{
379 if (atomic_dec_and_test(&sa->refcnt))
380 call_rcu(&sa->rcu, free_txsa);
381}
382
383static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
384{
385 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
386 return (struct macsec_cb *)skb->cb;
387}
388
389#define MACSEC_PORT_ES (htons(0x0001))
390#define MACSEC_PORT_SCB (0x0000)
391#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
392
393#define DEFAULT_SAK_LEN 16
394#define DEFAULT_SEND_SCI true
395#define DEFAULT_ENCRYPT false
396#define DEFAULT_ENCODING_SA 0
397
398static sci_t make_sci(u8 *addr, __be16 port)
399{
400 sci_t sci;
401
402 memcpy(&sci, addr, ETH_ALEN);
403 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
404
405 return sci;
406}
407
408static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
409{
410 sci_t sci;
411
412 if (sci_present)
413 memcpy(&sci, hdr->secure_channel_id,
414 sizeof(hdr->secure_channel_id));
415 else
416 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
417
418 return sci;
419}
420
421static unsigned int macsec_sectag_len(bool sci_present)
422{
423 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
424}
425
426static unsigned int macsec_hdr_len(bool sci_present)
427{
428 return macsec_sectag_len(sci_present) + ETH_HLEN;
429}
430
431static unsigned int macsec_extra_len(bool sci_present)
432{
433 return macsec_sectag_len(sci_present) + sizeof(__be16);
434}
435
436/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
437static void macsec_fill_sectag(struct macsec_eth_header *h,
438 const struct macsec_secy *secy, u32 pn)
439{
440 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
441
442 memset(&h->tci_an, 0, macsec_sectag_len(tx_sc->send_sci));
443 h->eth.h_proto = htons(ETH_P_MACSEC);
444
445 if (tx_sc->send_sci ||
446 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb)) {
447 h->tci_an |= MACSEC_TCI_SC;
448 memcpy(&h->secure_channel_id, &secy->sci,
449 sizeof(h->secure_channel_id));
450 } else {
451 if (tx_sc->end_station)
452 h->tci_an |= MACSEC_TCI_ES;
453 if (tx_sc->scb)
454 h->tci_an |= MACSEC_TCI_SCB;
455 }
456
457 h->packet_number = htonl(pn);
458
459 /* with GCM, C/E clear for !encrypt, both set for encrypt */
460 if (tx_sc->encrypt)
461 h->tci_an |= MACSEC_TCI_CONFID;
462 else if (secy->icv_len != DEFAULT_ICV_LEN)
463 h->tci_an |= MACSEC_TCI_C;
464
465 h->tci_an |= tx_sc->encoding_sa;
466}
467
468static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
469{
470 if (data_len < MIN_NON_SHORT_LEN)
471 h->short_length = data_len;
472}
473
474/* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
475static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
476{
477 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
478 int len = skb->len - 2 * ETH_ALEN;
479 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
480
481 /* a) It comprises at least 17 octets */
482 if (skb->len <= 16)
483 return false;
484
485 /* b) MACsec EtherType: already checked */
486
487 /* c) V bit is clear */
488 if (h->tci_an & MACSEC_TCI_VERSION)
489 return false;
490
491 /* d) ES or SCB => !SC */
492 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
493 (h->tci_an & MACSEC_TCI_SC))
494 return false;
495
496 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
497 if (h->unused)
498 return false;
499
500 /* rx.pn != 0 (figure 10-5) */
501 if (!h->packet_number)
502 return false;
503
504 /* length check, f) g) h) i) */
505 if (h->short_length)
506 return len == extra_len + h->short_length;
507 return len >= extra_len + MIN_NON_SHORT_LEN;
508}
509
510#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
511#define MACSEC_NEEDED_TAILROOM MACSEC_MAX_ICV_LEN
512
513static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
514{
515 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
516
517 gcm_iv->sci = sci;
518 gcm_iv->pn = htonl(pn);
519}
520
521static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
522{
523 return (struct macsec_eth_header *)skb_mac_header(skb);
524}
525
526static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
527{
528 u32 pn;
529
530 spin_lock_bh(&tx_sa->lock);
531 pn = tx_sa->next_pn;
532
533 tx_sa->next_pn++;
534 if (tx_sa->next_pn == 0) {
535 pr_debug("PN wrapped, transitioning to !oper\n");
536 tx_sa->active = false;
537 if (secy->protect_frames)
538 secy->operational = false;
539 }
540 spin_unlock_bh(&tx_sa->lock);
541
542 return pn;
543}
544
545static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
546{
547 struct macsec_dev *macsec = netdev_priv(dev);
548
549 skb->dev = macsec->real_dev;
550 skb_reset_mac_header(skb);
551 skb->protocol = eth_hdr(skb)->h_proto;
552}
553
554static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
555 struct macsec_tx_sa *tx_sa)
556{
557 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
558
559 u64_stats_update_begin(&txsc_stats->syncp);
560 if (tx_sc->encrypt) {
561 txsc_stats->stats.OutOctetsEncrypted += skb->len;
562 txsc_stats->stats.OutPktsEncrypted++;
563 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
564 } else {
565 txsc_stats->stats.OutOctetsProtected += skb->len;
566 txsc_stats->stats.OutPktsProtected++;
567 this_cpu_inc(tx_sa->stats->OutPktsProtected);
568 }
569 u64_stats_update_end(&txsc_stats->syncp);
570}
571
572static void count_tx(struct net_device *dev, int ret, int len)
573{
574 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
575 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
576
577 u64_stats_update_begin(&stats->syncp);
578 stats->tx_packets++;
579 stats->tx_bytes += len;
580 u64_stats_update_end(&stats->syncp);
581 } else {
582 dev->stats.tx_dropped++;
583 }
584}
585
586static void macsec_encrypt_done(struct crypto_async_request *base, int err)
587{
588 struct sk_buff *skb = base->data;
589 struct net_device *dev = skb->dev;
590 struct macsec_dev *macsec = macsec_priv(dev);
591 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
592 int len, ret;
593
594 aead_request_free(macsec_skb_cb(skb)->req);
595
596 rcu_read_lock_bh();
597 macsec_encrypt_finish(skb, dev);
598 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
599 len = skb->len;
600 ret = dev_queue_xmit(skb);
601 count_tx(dev, ret, len);
602 rcu_read_unlock_bh();
603
604 macsec_txsa_put(sa);
605 dev_put(dev);
606}
607
608static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
609 struct net_device *dev)
610{
611 int ret;
612 struct scatterlist sg[MAX_SKB_FRAGS + 1];
613 unsigned char iv[GCM_AES_IV_LEN];
614 struct ethhdr *eth;
615 struct macsec_eth_header *hh;
616 size_t unprotected_len;
617 struct aead_request *req;
618 struct macsec_secy *secy;
619 struct macsec_tx_sc *tx_sc;
620 struct macsec_tx_sa *tx_sa;
621 struct macsec_dev *macsec = macsec_priv(dev);
622 u32 pn;
623
624 secy = &macsec->secy;
625 tx_sc = &secy->tx_sc;
626
627 /* 10.5.1 TX SA assignment */
628 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
629 if (!tx_sa) {
630 secy->operational = false;
631 kfree_skb(skb);
632 return ERR_PTR(-EINVAL);
633 }
634
635 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
636 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
637 struct sk_buff *nskb = skb_copy_expand(skb,
638 MACSEC_NEEDED_HEADROOM,
639 MACSEC_NEEDED_TAILROOM,
640 GFP_ATOMIC);
641 if (likely(nskb)) {
642 consume_skb(skb);
643 skb = nskb;
644 } else {
645 macsec_txsa_put(tx_sa);
646 kfree_skb(skb);
647 return ERR_PTR(-ENOMEM);
648 }
649 } else {
650 skb = skb_unshare(skb, GFP_ATOMIC);
651 if (!skb) {
652 macsec_txsa_put(tx_sa);
653 return ERR_PTR(-ENOMEM);
654 }
655 }
656
657 unprotected_len = skb->len;
658 eth = eth_hdr(skb);
659 hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(tx_sc->send_sci));
660 memmove(hh, eth, 2 * ETH_ALEN);
661
662 pn = tx_sa_update_pn(tx_sa, secy);
663 if (pn == 0) {
664 macsec_txsa_put(tx_sa);
665 kfree_skb(skb);
666 return ERR_PTR(-ENOLINK);
667 }
668 macsec_fill_sectag(hh, secy, pn);
669 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
670
671 macsec_fill_iv(iv, secy->sci, pn);
672
673 skb_put(skb, secy->icv_len);
674
675 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
676 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
677
678 u64_stats_update_begin(&secy_stats->syncp);
679 secy_stats->stats.OutPktsTooLong++;
680 u64_stats_update_end(&secy_stats->syncp);
681
682 macsec_txsa_put(tx_sa);
683 kfree_skb(skb);
684 return ERR_PTR(-EINVAL);
685 }
686
687 req = aead_request_alloc(tx_sa->key.tfm, GFP_ATOMIC);
688 if (!req) {
689 macsec_txsa_put(tx_sa);
690 kfree_skb(skb);
691 return ERR_PTR(-ENOMEM);
692 }
693
694 sg_init_table(sg, MAX_SKB_FRAGS + 1);
695 skb_to_sgvec(skb, sg, 0, skb->len);
696
697 if (tx_sc->encrypt) {
698 int len = skb->len - macsec_hdr_len(tx_sc->send_sci) -
699 secy->icv_len;
700 aead_request_set_crypt(req, sg, sg, len, iv);
701 aead_request_set_ad(req, macsec_hdr_len(tx_sc->send_sci));
702 } else {
703 aead_request_set_crypt(req, sg, sg, 0, iv);
704 aead_request_set_ad(req, skb->len - secy->icv_len);
705 }
706
707 macsec_skb_cb(skb)->req = req;
708 macsec_skb_cb(skb)->tx_sa = tx_sa;
709 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
710
711 dev_hold(skb->dev);
712 ret = crypto_aead_encrypt(req);
713 if (ret == -EINPROGRESS) {
714 return ERR_PTR(ret);
715 } else if (ret != 0) {
716 dev_put(skb->dev);
717 kfree_skb(skb);
718 aead_request_free(req);
719 macsec_txsa_put(tx_sa);
720 return ERR_PTR(-EINVAL);
721 }
722
723 dev_put(skb->dev);
724 aead_request_free(req);
725 macsec_txsa_put(tx_sa);
726
727 return skb;
728}
729
730static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
731{
732 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
733 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
734 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
735 u32 lowest_pn = 0;
736
737 spin_lock(&rx_sa->lock);
738 if (rx_sa->next_pn >= secy->replay_window)
739 lowest_pn = rx_sa->next_pn - secy->replay_window;
740
741 /* Now perform replay protection check again
742 * (see IEEE 802.1AE-2006 figure 10-5)
743 */
744 if (secy->replay_protect && pn < lowest_pn) {
745 spin_unlock(&rx_sa->lock);
746 u64_stats_update_begin(&rxsc_stats->syncp);
747 rxsc_stats->stats.InPktsLate++;
748 u64_stats_update_end(&rxsc_stats->syncp);
749 return false;
750 }
751
752 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
753 u64_stats_update_begin(&rxsc_stats->syncp);
754 if (hdr->tci_an & MACSEC_TCI_E)
755 rxsc_stats->stats.InOctetsDecrypted += skb->len;
756 else
757 rxsc_stats->stats.InOctetsValidated += skb->len;
758 u64_stats_update_end(&rxsc_stats->syncp);
759 }
760
761 if (!macsec_skb_cb(skb)->valid) {
762 spin_unlock(&rx_sa->lock);
763
764 /* 10.6.5 */
765 if (hdr->tci_an & MACSEC_TCI_C ||
766 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
767 u64_stats_update_begin(&rxsc_stats->syncp);
768 rxsc_stats->stats.InPktsNotValid++;
769 u64_stats_update_end(&rxsc_stats->syncp);
770 return false;
771 }
772
773 u64_stats_update_begin(&rxsc_stats->syncp);
774 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
775 rxsc_stats->stats.InPktsInvalid++;
776 this_cpu_inc(rx_sa->stats->InPktsInvalid);
777 } else if (pn < lowest_pn) {
778 rxsc_stats->stats.InPktsDelayed++;
779 } else {
780 rxsc_stats->stats.InPktsUnchecked++;
781 }
782 u64_stats_update_end(&rxsc_stats->syncp);
783 } else {
784 u64_stats_update_begin(&rxsc_stats->syncp);
785 if (pn < lowest_pn) {
786 rxsc_stats->stats.InPktsDelayed++;
787 } else {
788 rxsc_stats->stats.InPktsOK++;
789 this_cpu_inc(rx_sa->stats->InPktsOK);
790 }
791 u64_stats_update_end(&rxsc_stats->syncp);
792
793 if (pn >= rx_sa->next_pn)
794 rx_sa->next_pn = pn + 1;
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 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
815 skb_pull(skb, hdr_len);
816 pskb_trim_unique(skb, skb->len - icv_len);
817}
818
819static void count_rx(struct net_device *dev, int len)
820{
821 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
822
823 u64_stats_update_begin(&stats->syncp);
824 stats->rx_packets++;
825 stats->rx_bytes += len;
826 u64_stats_update_end(&stats->syncp);
827}
828
829static void macsec_decrypt_done(struct crypto_async_request *base, int err)
830{
831 struct sk_buff *skb = base->data;
832 struct net_device *dev = skb->dev;
833 struct macsec_dev *macsec = macsec_priv(dev);
834 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
835 int len, ret;
836 u32 pn;
837
838 aead_request_free(macsec_skb_cb(skb)->req);
839
840 rcu_read_lock_bh();
841 pn = ntohl(macsec_ethhdr(skb)->packet_number);
842 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
843 rcu_read_unlock_bh();
844 kfree_skb(skb);
845 goto out;
846 }
847
848 macsec_finalize_skb(skb, macsec->secy.icv_len,
849 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
850 macsec_reset_skb(skb, macsec->secy.netdev);
851
852 len = skb->len;
853 ret = netif_rx(skb);
854 if (ret == NET_RX_SUCCESS)
855 count_rx(dev, len);
856 else
857 macsec->secy.netdev->stats.rx_dropped++;
858
859 rcu_read_unlock_bh();
860
861out:
862 macsec_rxsa_put(rx_sa);
863 dev_put(dev);
864 return;
865}
866
867static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
868 struct net_device *dev,
869 struct macsec_rx_sa *rx_sa,
870 sci_t sci,
871 struct macsec_secy *secy)
872{
873 int ret;
874 struct scatterlist sg[MAX_SKB_FRAGS + 1];
875 unsigned char iv[GCM_AES_IV_LEN];
876 struct aead_request *req;
877 struct macsec_eth_header *hdr;
878 u16 icv_len = secy->icv_len;
879
880 macsec_skb_cb(skb)->valid = false;
881 skb = skb_share_check(skb, GFP_ATOMIC);
882 if (!skb)
883 return ERR_PTR(-ENOMEM);
884
885 req = aead_request_alloc(rx_sa->key.tfm, GFP_ATOMIC);
886 if (!req) {
887 kfree_skb(skb);
888 return ERR_PTR(-ENOMEM);
889 }
890
891 hdr = (struct macsec_eth_header *)skb->data;
892 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
893
894 sg_init_table(sg, MAX_SKB_FRAGS + 1);
895 skb_to_sgvec(skb, sg, 0, skb->len);
896
897 if (hdr->tci_an & MACSEC_TCI_E) {
898 /* confidentiality: ethernet + macsec header
899 * authenticated, encrypted payload
900 */
901 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
902
903 aead_request_set_crypt(req, sg, sg, len, iv);
904 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
905 skb = skb_unshare(skb, GFP_ATOMIC);
906 if (!skb) {
907 aead_request_free(req);
908 return ERR_PTR(-ENOMEM);
909 }
910 } else {
911 /* integrity only: all headers + data authenticated */
912 aead_request_set_crypt(req, sg, sg, icv_len, iv);
913 aead_request_set_ad(req, skb->len - icv_len);
914 }
915
916 macsec_skb_cb(skb)->req = req;
917 macsec_skb_cb(skb)->rx_sa = rx_sa;
918 skb->dev = dev;
919 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
920
921 dev_hold(dev);
922 ret = crypto_aead_decrypt(req);
923 if (ret == -EINPROGRESS) {
924 return ERR_PTR(ret);
925 } else if (ret != 0) {
926 /* decryption/authentication failed
927 * 10.6 if validateFrames is disabled, deliver anyway
928 */
929 if (ret != -EBADMSG) {
930 kfree_skb(skb);
931 skb = ERR_PTR(ret);
932 }
933 } else {
934 macsec_skb_cb(skb)->valid = true;
935 }
936 dev_put(dev);
937
938 aead_request_free(req);
939
940 return skb;
941}
942
943static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
944{
945 struct macsec_rx_sc *rx_sc;
946
947 for_each_rxsc(secy, rx_sc) {
948 if (rx_sc->sci == sci)
949 return rx_sc;
950 }
951
952 return NULL;
953}
954
955static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
956{
957 struct macsec_rx_sc *rx_sc;
958
959 for_each_rxsc_rtnl(secy, rx_sc) {
960 if (rx_sc->sci == sci)
961 return rx_sc;
962 }
963
964 return NULL;
965}
966
967static void handle_not_macsec(struct sk_buff *skb)
968{
969 struct macsec_rxh_data *rxd;
970 struct macsec_dev *macsec;
971
972 rcu_read_lock();
973 rxd = macsec_data_rcu(skb->dev);
974
975 /* 10.6 If the management control validateFrames is not
976 * Strict, frames without a SecTAG are received, counted, and
977 * delivered to the Controlled Port
978 */
979 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
980 struct sk_buff *nskb;
981 int ret;
982 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
983
984 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
985 u64_stats_update_begin(&secy_stats->syncp);
986 secy_stats->stats.InPktsNoTag++;
987 u64_stats_update_end(&secy_stats->syncp);
988 continue;
989 }
990
991 /* deliver on this port */
992 nskb = skb_clone(skb, GFP_ATOMIC);
993 if (!nskb)
994 break;
995
996 nskb->dev = macsec->secy.netdev;
997
998 ret = netif_rx(nskb);
999 if (ret == NET_RX_SUCCESS) {
1000 u64_stats_update_begin(&secy_stats->syncp);
1001 secy_stats->stats.InPktsUntagged++;
1002 u64_stats_update_end(&secy_stats->syncp);
1003 } else {
1004 macsec->secy.netdev->stats.rx_dropped++;
1005 }
1006 }
1007
1008 rcu_read_unlock();
1009}
1010
1011static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1012{
1013 struct sk_buff *skb = *pskb;
1014 struct net_device *dev = skb->dev;
1015 struct macsec_eth_header *hdr;
1016 struct macsec_secy *secy = NULL;
1017 struct macsec_rx_sc *rx_sc;
1018 struct macsec_rx_sa *rx_sa;
1019 struct macsec_rxh_data *rxd;
1020 struct macsec_dev *macsec;
1021 sci_t sci;
1022 u32 pn;
1023 bool cbit;
1024 struct pcpu_rx_sc_stats *rxsc_stats;
1025 struct pcpu_secy_stats *secy_stats;
1026 bool pulled_sci;
1027
1028 if (skb_headroom(skb) < ETH_HLEN)
1029 goto drop_direct;
1030
1031 hdr = macsec_ethhdr(skb);
1032 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1033 handle_not_macsec(skb);
1034
1035 /* and deliver to the uncontrolled port */
1036 return RX_HANDLER_PASS;
1037 }
1038
1039 skb = skb_unshare(skb, GFP_ATOMIC);
1040 if (!skb) {
1041 *pskb = NULL;
1042 return RX_HANDLER_CONSUMED;
1043 }
1044
1045 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1046 if (!pulled_sci) {
1047 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1048 goto drop_direct;
1049 }
1050
1051 hdr = macsec_ethhdr(skb);
1052
1053 /* Frames with a SecTAG that has the TCI E bit set but the C
1054 * bit clear are discarded, as this reserved encoding is used
1055 * to identify frames with a SecTAG that are not to be
1056 * delivered to the Controlled Port.
1057 */
1058 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1059 return RX_HANDLER_PASS;
1060
1061 /* now, pull the extra length */
1062 if (hdr->tci_an & MACSEC_TCI_SC) {
1063 if (!pulled_sci)
1064 goto drop_direct;
1065 }
1066
1067 /* ethernet header is part of crypto processing */
1068 skb_push(skb, ETH_HLEN);
1069
1070 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1071 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1072 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1073
1074 rcu_read_lock();
1075 rxd = macsec_data_rcu(skb->dev);
1076
1077 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1078 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1079
1080 if (sc) {
1081 secy = &macsec->secy;
1082 rx_sc = sc;
1083 break;
1084 }
1085 }
1086
1087 if (!secy)
1088 goto nosci;
1089
1090 dev = secy->netdev;
1091 macsec = macsec_priv(dev);
1092 secy_stats = this_cpu_ptr(macsec->stats);
1093 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1094
1095 if (!macsec_validate_skb(skb, secy->icv_len)) {
1096 u64_stats_update_begin(&secy_stats->syncp);
1097 secy_stats->stats.InPktsBadTag++;
1098 u64_stats_update_end(&secy_stats->syncp);
1099 goto drop_nosa;
1100 }
1101
1102 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1103 if (!rx_sa) {
1104 /* 10.6.1 if the SA is not in use */
1105
1106 /* If validateFrames is Strict or the C bit in the
1107 * SecTAG is set, discard
1108 */
1109 if (hdr->tci_an & MACSEC_TCI_C ||
1110 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1111 u64_stats_update_begin(&rxsc_stats->syncp);
1112 rxsc_stats->stats.InPktsNotUsingSA++;
1113 u64_stats_update_end(&rxsc_stats->syncp);
1114 goto drop_nosa;
1115 }
1116
1117 /* not Strict, the frame (with the SecTAG and ICV
1118 * removed) is delivered to the Controlled Port.
1119 */
1120 u64_stats_update_begin(&rxsc_stats->syncp);
1121 rxsc_stats->stats.InPktsUnusedSA++;
1122 u64_stats_update_end(&rxsc_stats->syncp);
1123 goto deliver;
1124 }
1125
1126 /* First, PN check to avoid decrypting obviously wrong packets */
1127 pn = ntohl(hdr->packet_number);
1128 if (secy->replay_protect) {
1129 bool late;
1130
1131 spin_lock(&rx_sa->lock);
1132 late = rx_sa->next_pn >= secy->replay_window &&
1133 pn < (rx_sa->next_pn - secy->replay_window);
1134 spin_unlock(&rx_sa->lock);
1135
1136 if (late) {
1137 u64_stats_update_begin(&rxsc_stats->syncp);
1138 rxsc_stats->stats.InPktsLate++;
1139 u64_stats_update_end(&rxsc_stats->syncp);
1140 goto drop;
1141 }
1142 }
1143
1144 /* Disabled && !changed text => skip validation */
1145 if (hdr->tci_an & MACSEC_TCI_C ||
1146 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1147 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1148
1149 if (IS_ERR(skb)) {
1150 /* the decrypt callback needs the reference */
1151 if (PTR_ERR(skb) != -EINPROGRESS)
1152 macsec_rxsa_put(rx_sa);
1153 rcu_read_unlock();
1154 *pskb = NULL;
1155 return RX_HANDLER_CONSUMED;
1156 }
1157
1158 if (!macsec_post_decrypt(skb, secy, pn))
1159 goto drop;
1160
1161deliver:
1162 macsec_finalize_skb(skb, secy->icv_len,
1163 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1164 macsec_reset_skb(skb, secy->netdev);
1165
1166 if (rx_sa)
1167 macsec_rxsa_put(rx_sa);
1168 count_rx(dev, skb->len);
1169
1170 rcu_read_unlock();
1171
1172 *pskb = skb;
1173 return RX_HANDLER_ANOTHER;
1174
1175drop:
1176 macsec_rxsa_put(rx_sa);
1177drop_nosa:
1178 rcu_read_unlock();
1179drop_direct:
1180 kfree_skb(skb);
1181 *pskb = NULL;
1182 return RX_HANDLER_CONSUMED;
1183
1184nosci:
1185 /* 10.6.1 if the SC is not found */
1186 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1187 if (!cbit)
1188 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1189 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1190
1191 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1192 struct sk_buff *nskb;
1193 int ret;
1194
1195 secy_stats = this_cpu_ptr(macsec->stats);
1196
1197 /* If validateFrames is Strict or the C bit in the
1198 * SecTAG is set, discard
1199 */
1200 if (cbit ||
1201 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1202 u64_stats_update_begin(&secy_stats->syncp);
1203 secy_stats->stats.InPktsNoSCI++;
1204 u64_stats_update_end(&secy_stats->syncp);
1205 continue;
1206 }
1207
1208 /* not strict, the frame (with the SecTAG and ICV
1209 * removed) is delivered to the Controlled Port.
1210 */
1211 nskb = skb_clone(skb, GFP_ATOMIC);
1212 if (!nskb)
1213 break;
1214
1215 macsec_reset_skb(nskb, macsec->secy.netdev);
1216
1217 ret = netif_rx(nskb);
1218 if (ret == NET_RX_SUCCESS) {
1219 u64_stats_update_begin(&secy_stats->syncp);
1220 secy_stats->stats.InPktsUnknownSCI++;
1221 u64_stats_update_end(&secy_stats->syncp);
1222 } else {
1223 macsec->secy.netdev->stats.rx_dropped++;
1224 }
1225 }
1226
1227 rcu_read_unlock();
1228 *pskb = skb;
1229 return RX_HANDLER_PASS;
1230}
1231
1232static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1233{
1234 struct crypto_aead *tfm;
1235 int ret;
1236
1237 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
1238 if (!tfm || IS_ERR(tfm))
1239 return NULL;
1240
1241 ret = crypto_aead_setkey(tfm, key, key_len);
1242 if (ret < 0) {
1243 crypto_free_aead(tfm);
1244 return NULL;
1245 }
1246
1247 ret = crypto_aead_setauthsize(tfm, icv_len);
1248 if (ret < 0) {
1249 crypto_free_aead(tfm);
1250 return NULL;
1251 }
1252
1253 return tfm;
1254}
1255
1256static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1257 int icv_len)
1258{
1259 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1260 if (!rx_sa->stats)
1261 return -1;
1262
1263 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1264 if (!rx_sa->key.tfm) {
1265 free_percpu(rx_sa->stats);
1266 return -1;
1267 }
1268
1269 rx_sa->active = false;
1270 rx_sa->next_pn = 1;
1271 atomic_set(&rx_sa->refcnt, 1);
1272 spin_lock_init(&rx_sa->lock);
1273
1274 return 0;
1275}
1276
1277static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1278{
1279 rx_sa->active = false;
1280
1281 macsec_rxsa_put(rx_sa);
1282}
1283
1284static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1285{
1286 int i;
1287
1288 for (i = 0; i < MACSEC_NUM_AN; i++) {
1289 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1290
1291 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1292 if (sa)
1293 clear_rx_sa(sa);
1294 }
1295
1296 macsec_rxsc_put(rx_sc);
1297}
1298
1299static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1300{
1301 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1302
1303 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1304 rx_sc;
1305 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1306 if (rx_sc->sci == sci) {
1307 if (rx_sc->active)
1308 secy->n_rx_sc--;
1309 rcu_assign_pointer(*rx_scp, rx_sc->next);
1310 return rx_sc;
1311 }
1312 }
1313
1314 return NULL;
1315}
1316
1317static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1318{
1319 struct macsec_rx_sc *rx_sc;
1320 struct macsec_dev *macsec;
1321 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1322 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1323 struct macsec_secy *secy;
1324
1325 list_for_each_entry(macsec, &rxd->secys, secys) {
1326 if (find_rx_sc_rtnl(&macsec->secy, sci))
1327 return ERR_PTR(-EEXIST);
1328 }
1329
1330 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1331 if (!rx_sc)
1332 return ERR_PTR(-ENOMEM);
1333
1334 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1335 if (!rx_sc->stats) {
1336 kfree(rx_sc);
1337 return ERR_PTR(-ENOMEM);
1338 }
1339
1340 rx_sc->sci = sci;
1341 rx_sc->active = true;
1342 atomic_set(&rx_sc->refcnt, 1);
1343
1344 secy = &macsec_priv(dev)->secy;
1345 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1346 rcu_assign_pointer(secy->rx_sc, rx_sc);
1347
1348 if (rx_sc->active)
1349 secy->n_rx_sc++;
1350
1351 return rx_sc;
1352}
1353
1354static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1355 int icv_len)
1356{
1357 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1358 if (!tx_sa->stats)
1359 return -1;
1360
1361 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1362 if (!tx_sa->key.tfm) {
1363 free_percpu(tx_sa->stats);
1364 return -1;
1365 }
1366
1367 tx_sa->active = false;
1368 atomic_set(&tx_sa->refcnt, 1);
1369 spin_lock_init(&tx_sa->lock);
1370
1371 return 0;
1372}
1373
1374static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1375{
1376 tx_sa->active = false;
1377
1378 macsec_txsa_put(tx_sa);
1379}
1380
1381static struct genl_family macsec_fam = {
1382 .id = GENL_ID_GENERATE,
1383 .name = MACSEC_GENL_NAME,
1384 .hdrsize = 0,
1385 .version = MACSEC_GENL_VERSION,
1386 .maxattr = MACSEC_ATTR_MAX,
1387 .netnsok = true,
1388};
1389
1390static struct net_device *get_dev_from_nl(struct net *net,
1391 struct nlattr **attrs)
1392{
1393 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1394 struct net_device *dev;
1395
1396 dev = __dev_get_by_index(net, ifindex);
1397 if (!dev)
1398 return ERR_PTR(-ENODEV);
1399
1400 if (!netif_is_macsec(dev))
1401 return ERR_PTR(-ENODEV);
1402
1403 return dev;
1404}
1405
1406static sci_t nla_get_sci(const struct nlattr *nla)
1407{
1408 return (__force sci_t)nla_get_u64(nla);
1409}
1410
1411static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value)
1412{
1413 return nla_put_u64(skb, attrtype, (__force u64)value);
1414}
1415
1416static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1417 struct nlattr **attrs,
1418 struct nlattr **tb_sa,
1419 struct net_device **devp,
1420 struct macsec_secy **secyp,
1421 struct macsec_tx_sc **scp,
1422 u8 *assoc_num)
1423{
1424 struct net_device *dev;
1425 struct macsec_secy *secy;
1426 struct macsec_tx_sc *tx_sc;
1427 struct macsec_tx_sa *tx_sa;
1428
1429 if (!tb_sa[MACSEC_SA_ATTR_AN])
1430 return ERR_PTR(-EINVAL);
1431
1432 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1433
1434 dev = get_dev_from_nl(net, attrs);
1435 if (IS_ERR(dev))
1436 return ERR_CAST(dev);
1437
1438 if (*assoc_num >= MACSEC_NUM_AN)
1439 return ERR_PTR(-EINVAL);
1440
1441 secy = &macsec_priv(dev)->secy;
1442 tx_sc = &secy->tx_sc;
1443
1444 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1445 if (!tx_sa)
1446 return ERR_PTR(-ENODEV);
1447
1448 *devp = dev;
1449 *scp = tx_sc;
1450 *secyp = secy;
1451 return tx_sa;
1452}
1453
1454static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1455 struct nlattr **attrs,
1456 struct nlattr **tb_rxsc,
1457 struct net_device **devp,
1458 struct macsec_secy **secyp)
1459{
1460 struct net_device *dev;
1461 struct macsec_secy *secy;
1462 struct macsec_rx_sc *rx_sc;
1463 sci_t sci;
1464
1465 dev = get_dev_from_nl(net, attrs);
1466 if (IS_ERR(dev))
1467 return ERR_CAST(dev);
1468
1469 secy = &macsec_priv(dev)->secy;
1470
1471 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1472 return ERR_PTR(-EINVAL);
1473
1474 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1475 rx_sc = find_rx_sc_rtnl(secy, sci);
1476 if (!rx_sc)
1477 return ERR_PTR(-ENODEV);
1478
1479 *secyp = secy;
1480 *devp = dev;
1481
1482 return rx_sc;
1483}
1484
1485static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1486 struct nlattr **attrs,
1487 struct nlattr **tb_rxsc,
1488 struct nlattr **tb_sa,
1489 struct net_device **devp,
1490 struct macsec_secy **secyp,
1491 struct macsec_rx_sc **scp,
1492 u8 *assoc_num)
1493{
1494 struct macsec_rx_sc *rx_sc;
1495 struct macsec_rx_sa *rx_sa;
1496
1497 if (!tb_sa[MACSEC_SA_ATTR_AN])
1498 return ERR_PTR(-EINVAL);
1499
1500 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1501 if (*assoc_num >= MACSEC_NUM_AN)
1502 return ERR_PTR(-EINVAL);
1503
1504 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1505 if (IS_ERR(rx_sc))
1506 return ERR_CAST(rx_sc);
1507
1508 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1509 if (!rx_sa)
1510 return ERR_PTR(-ENODEV);
1511
1512 *scp = rx_sc;
1513 return rx_sa;
1514}
1515
1516
1517static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1518 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1519 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1520 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1521};
1522
1523static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1524 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1525 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1526};
1527
1528static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1529 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1530 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1531 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1532 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1533 .len = MACSEC_KEYID_LEN, },
1534 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1535 .len = MACSEC_MAX_KEY_LEN, },
1536};
1537
1538static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1539{
1540 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1541 return -EINVAL;
1542
1543 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG],
1544 macsec_genl_sa_policy))
1545 return -EINVAL;
1546
1547 return 0;
1548}
1549
1550static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1551{
1552 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1553 return -EINVAL;
1554
1555 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG],
1556 macsec_genl_rxsc_policy))
1557 return -EINVAL;
1558
1559 return 0;
1560}
1561
1562static bool validate_add_rxsa(struct nlattr **attrs)
1563{
1564 if (!attrs[MACSEC_SA_ATTR_AN] ||
1565 !attrs[MACSEC_SA_ATTR_KEY] ||
1566 !attrs[MACSEC_SA_ATTR_KEYID])
1567 return false;
1568
1569 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1570 return false;
1571
1572 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1573 return false;
1574
1575 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1576 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1577 return false;
1578 }
1579
1580 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1581 return false;
1582
1583 return true;
1584}
1585
1586static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1587{
1588 struct net_device *dev;
1589 struct nlattr **attrs = info->attrs;
1590 struct macsec_secy *secy;
1591 struct macsec_rx_sc *rx_sc;
1592 struct macsec_rx_sa *rx_sa;
1593 unsigned char assoc_num;
1594 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1595 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1596
1597 if (!attrs[MACSEC_ATTR_IFINDEX])
1598 return -EINVAL;
1599
1600 if (parse_sa_config(attrs, tb_sa))
1601 return -EINVAL;
1602
1603 if (parse_rxsc_config(attrs, tb_rxsc))
1604 return -EINVAL;
1605
1606 if (!validate_add_rxsa(tb_sa))
1607 return -EINVAL;
1608
1609 rtnl_lock();
1610 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1611 if (IS_ERR(rx_sc) || !macsec_rxsc_get(rx_sc)) {
1612 rtnl_unlock();
1613 return PTR_ERR(rx_sc);
1614 }
1615
1616 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1617
1618 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1619 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1620 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1621 rtnl_unlock();
1622 return -EINVAL;
1623 }
1624
1625 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1626 if (rx_sa) {
1627 rtnl_unlock();
1628 return -EBUSY;
1629 }
1630
1631 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1632 if (!rx_sa || init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1633 secy->key_len, secy->icv_len)) {
1634 kfree(rx_sa);
1635 rtnl_unlock();
1636 return -ENOMEM;
1637 }
1638
1639 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1640 spin_lock_bh(&rx_sa->lock);
1641 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1642 spin_unlock_bh(&rx_sa->lock);
1643 }
1644
1645 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1646 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1647
1648 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEY], MACSEC_KEYID_LEN);
1649 rx_sa->sc = rx_sc;
1650 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1651
1652 rtnl_unlock();
1653
1654 return 0;
1655}
1656
1657static bool validate_add_rxsc(struct nlattr **attrs)
1658{
1659 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1660 return false;
1661
1662 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1663 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1664 return false;
1665 }
1666
1667 return true;
1668}
1669
1670static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1671{
1672 struct net_device *dev;
1673 sci_t sci = MACSEC_UNDEF_SCI;
1674 struct nlattr **attrs = info->attrs;
1675 struct macsec_rx_sc *rx_sc;
1676 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1677
1678 if (!attrs[MACSEC_ATTR_IFINDEX])
1679 return -EINVAL;
1680
1681 if (parse_rxsc_config(attrs, tb_rxsc))
1682 return -EINVAL;
1683
1684 if (!validate_add_rxsc(tb_rxsc))
1685 return -EINVAL;
1686
1687 rtnl_lock();
1688 dev = get_dev_from_nl(genl_info_net(info), attrs);
1689 if (IS_ERR(dev)) {
1690 rtnl_unlock();
1691 return PTR_ERR(dev);
1692 }
1693
1694 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1695
1696 rx_sc = create_rx_sc(dev, sci);
1697 if (IS_ERR(rx_sc)) {
1698 rtnl_unlock();
1699 return PTR_ERR(rx_sc);
1700 }
1701
1702 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1703 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1704
1705 rtnl_unlock();
1706
1707 return 0;
1708}
1709
1710static bool validate_add_txsa(struct nlattr **attrs)
1711{
1712 if (!attrs[MACSEC_SA_ATTR_AN] ||
1713 !attrs[MACSEC_SA_ATTR_PN] ||
1714 !attrs[MACSEC_SA_ATTR_KEY] ||
1715 !attrs[MACSEC_SA_ATTR_KEYID])
1716 return false;
1717
1718 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1719 return false;
1720
1721 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1722 return false;
1723
1724 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1725 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1726 return false;
1727 }
1728
1729 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1730 return false;
1731
1732 return true;
1733}
1734
1735static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1736{
1737 struct net_device *dev;
1738 struct nlattr **attrs = info->attrs;
1739 struct macsec_secy *secy;
1740 struct macsec_tx_sc *tx_sc;
1741 struct macsec_tx_sa *tx_sa;
1742 unsigned char assoc_num;
1743 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1744
1745 if (!attrs[MACSEC_ATTR_IFINDEX])
1746 return -EINVAL;
1747
1748 if (parse_sa_config(attrs, tb_sa))
1749 return -EINVAL;
1750
1751 if (!validate_add_txsa(tb_sa))
1752 return -EINVAL;
1753
1754 rtnl_lock();
1755 dev = get_dev_from_nl(genl_info_net(info), attrs);
1756 if (IS_ERR(dev)) {
1757 rtnl_unlock();
1758 return PTR_ERR(dev);
1759 }
1760
1761 secy = &macsec_priv(dev)->secy;
1762 tx_sc = &secy->tx_sc;
1763
1764 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1765
1766 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1767 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1768 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1769 rtnl_unlock();
1770 return -EINVAL;
1771 }
1772
1773 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1774 if (tx_sa) {
1775 rtnl_unlock();
1776 return -EBUSY;
1777 }
1778
1779 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1780 if (!tx_sa || init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1781 secy->key_len, secy->icv_len)) {
1782 kfree(tx_sa);
1783 rtnl_unlock();
1784 return -ENOMEM;
1785 }
1786
1787 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEY], MACSEC_KEYID_LEN);
1788
1789 spin_lock_bh(&tx_sa->lock);
1790 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1791 spin_unlock_bh(&tx_sa->lock);
1792
1793 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1794 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1795
1796 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1797 secy->operational = true;
1798
1799 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1800
1801 rtnl_unlock();
1802
1803 return 0;
1804}
1805
1806static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1807{
1808 struct nlattr **attrs = info->attrs;
1809 struct net_device *dev;
1810 struct macsec_secy *secy;
1811 struct macsec_rx_sc *rx_sc;
1812 struct macsec_rx_sa *rx_sa;
1813 u8 assoc_num;
1814 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1815 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1816
1817 if (!attrs[MACSEC_ATTR_IFINDEX])
1818 return -EINVAL;
1819
1820 if (parse_sa_config(attrs, tb_sa))
1821 return -EINVAL;
1822
1823 if (parse_rxsc_config(attrs, tb_rxsc))
1824 return -EINVAL;
1825
1826 rtnl_lock();
1827 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1828 &dev, &secy, &rx_sc, &assoc_num);
1829 if (IS_ERR(rx_sa)) {
1830 rtnl_unlock();
1831 return PTR_ERR(rx_sa);
1832 }
1833
1834 if (rx_sa->active) {
1835 rtnl_unlock();
1836 return -EBUSY;
1837 }
1838
1839 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1840 clear_rx_sa(rx_sa);
1841
1842 rtnl_unlock();
1843
1844 return 0;
1845}
1846
1847static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1848{
1849 struct nlattr **attrs = info->attrs;
1850 struct net_device *dev;
1851 struct macsec_secy *secy;
1852 struct macsec_rx_sc *rx_sc;
1853 sci_t sci;
1854 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1855
1856 if (!attrs[MACSEC_ATTR_IFINDEX])
1857 return -EINVAL;
1858
1859 if (parse_rxsc_config(attrs, tb_rxsc))
1860 return -EINVAL;
1861
1862 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1863 return -EINVAL;
1864
1865 rtnl_lock();
1866 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1867 if (IS_ERR(dev)) {
1868 rtnl_unlock();
1869 return PTR_ERR(dev);
1870 }
1871
1872 secy = &macsec_priv(dev)->secy;
1873 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1874
1875 rx_sc = del_rx_sc(secy, sci);
1876 if (!rx_sc) {
1877 rtnl_unlock();
1878 return -ENODEV;
1879 }
1880
1881 free_rx_sc(rx_sc);
1882 rtnl_unlock();
1883
1884 return 0;
1885}
1886
1887static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1888{
1889 struct nlattr **attrs = info->attrs;
1890 struct net_device *dev;
1891 struct macsec_secy *secy;
1892 struct macsec_tx_sc *tx_sc;
1893 struct macsec_tx_sa *tx_sa;
1894 u8 assoc_num;
1895 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1896
1897 if (!attrs[MACSEC_ATTR_IFINDEX])
1898 return -EINVAL;
1899
1900 if (parse_sa_config(attrs, tb_sa))
1901 return -EINVAL;
1902
1903 rtnl_lock();
1904 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1905 &dev, &secy, &tx_sc, &assoc_num);
1906 if (IS_ERR(tx_sa)) {
1907 rtnl_unlock();
1908 return PTR_ERR(tx_sa);
1909 }
1910
1911 if (tx_sa->active) {
1912 rtnl_unlock();
1913 return -EBUSY;
1914 }
1915
1916 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
1917 clear_tx_sa(tx_sa);
1918
1919 rtnl_unlock();
1920
1921 return 0;
1922}
1923
1924static bool validate_upd_sa(struct nlattr **attrs)
1925{
1926 if (!attrs[MACSEC_SA_ATTR_AN] ||
1927 attrs[MACSEC_SA_ATTR_KEY] ||
1928 attrs[MACSEC_SA_ATTR_KEYID])
1929 return false;
1930
1931 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1932 return false;
1933
1934 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1935 return false;
1936
1937 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1938 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1939 return false;
1940 }
1941
1942 return true;
1943}
1944
1945static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
1946{
1947 struct nlattr **attrs = info->attrs;
1948 struct net_device *dev;
1949 struct macsec_secy *secy;
1950 struct macsec_tx_sc *tx_sc;
1951 struct macsec_tx_sa *tx_sa;
1952 u8 assoc_num;
1953 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1954
1955 if (!attrs[MACSEC_ATTR_IFINDEX])
1956 return -EINVAL;
1957
1958 if (parse_sa_config(attrs, tb_sa))
1959 return -EINVAL;
1960
1961 if (!validate_upd_sa(tb_sa))
1962 return -EINVAL;
1963
1964 rtnl_lock();
1965 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1966 &dev, &secy, &tx_sc, &assoc_num);
1967 if (IS_ERR(tx_sa)) {
1968 rtnl_unlock();
1969 return PTR_ERR(tx_sa);
1970 }
1971
1972 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1973 spin_lock_bh(&tx_sa->lock);
1974 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1975 spin_unlock_bh(&tx_sa->lock);
1976 }
1977
1978 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1979 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1980
1981 if (assoc_num == tx_sc->encoding_sa)
1982 secy->operational = tx_sa->active;
1983
1984 rtnl_unlock();
1985
1986 return 0;
1987}
1988
1989static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
1990{
1991 struct nlattr **attrs = info->attrs;
1992 struct net_device *dev;
1993 struct macsec_secy *secy;
1994 struct macsec_rx_sc *rx_sc;
1995 struct macsec_rx_sa *rx_sa;
1996 u8 assoc_num;
1997 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1998 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1999
2000 if (!attrs[MACSEC_ATTR_IFINDEX])
2001 return -EINVAL;
2002
2003 if (parse_rxsc_config(attrs, tb_rxsc))
2004 return -EINVAL;
2005
2006 if (parse_sa_config(attrs, tb_sa))
2007 return -EINVAL;
2008
2009 if (!validate_upd_sa(tb_sa))
2010 return -EINVAL;
2011
2012 rtnl_lock();
2013 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2014 &dev, &secy, &rx_sc, &assoc_num);
2015 if (IS_ERR(rx_sa)) {
2016 rtnl_unlock();
2017 return PTR_ERR(rx_sa);
2018 }
2019
2020 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2021 spin_lock_bh(&rx_sa->lock);
2022 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2023 spin_unlock_bh(&rx_sa->lock);
2024 }
2025
2026 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2027 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2028
2029 rtnl_unlock();
2030 return 0;
2031}
2032
2033static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2034{
2035 struct nlattr **attrs = info->attrs;
2036 struct net_device *dev;
2037 struct macsec_secy *secy;
2038 struct macsec_rx_sc *rx_sc;
2039 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2040
2041 if (!attrs[MACSEC_ATTR_IFINDEX])
2042 return -EINVAL;
2043
2044 if (parse_rxsc_config(attrs, tb_rxsc))
2045 return -EINVAL;
2046
2047 if (!validate_add_rxsc(tb_rxsc))
2048 return -EINVAL;
2049
2050 rtnl_lock();
2051 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2052 if (IS_ERR(rx_sc)) {
2053 rtnl_unlock();
2054 return PTR_ERR(rx_sc);
2055 }
2056
2057 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2058 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2059
2060 if (rx_sc->active != new)
2061 secy->n_rx_sc += new ? 1 : -1;
2062
2063 rx_sc->active = new;
2064 }
2065
2066 rtnl_unlock();
2067
2068 return 0;
2069}
2070
2071static int copy_tx_sa_stats(struct sk_buff *skb,
2072 struct macsec_tx_sa_stats __percpu *pstats)
2073{
2074 struct macsec_tx_sa_stats sum = {0, };
2075 int cpu;
2076
2077 for_each_possible_cpu(cpu) {
2078 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2079
2080 sum.OutPktsProtected += stats->OutPktsProtected;
2081 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2082 }
2083
2084 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2085 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2086 return -EMSGSIZE;
2087
2088 return 0;
2089}
2090
2091static int copy_rx_sa_stats(struct sk_buff *skb,
2092 struct macsec_rx_sa_stats __percpu *pstats)
2093{
2094 struct macsec_rx_sa_stats sum = {0, };
2095 int cpu;
2096
2097 for_each_possible_cpu(cpu) {
2098 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2099
2100 sum.InPktsOK += stats->InPktsOK;
2101 sum.InPktsInvalid += stats->InPktsInvalid;
2102 sum.InPktsNotValid += stats->InPktsNotValid;
2103 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2104 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2105 }
2106
2107 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2108 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2109 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2110 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2111 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2112 return -EMSGSIZE;
2113
2114 return 0;
2115}
2116
2117static int copy_rx_sc_stats(struct sk_buff *skb,
2118 struct pcpu_rx_sc_stats __percpu *pstats)
2119{
2120 struct macsec_rx_sc_stats sum = {0, };
2121 int cpu;
2122
2123 for_each_possible_cpu(cpu) {
2124 const struct pcpu_rx_sc_stats *stats;
2125 struct macsec_rx_sc_stats tmp;
2126 unsigned int start;
2127
2128 stats = per_cpu_ptr(pstats, cpu);
2129 do {
2130 start = u64_stats_fetch_begin_irq(&stats->syncp);
2131 memcpy(&tmp, &stats->stats, sizeof(tmp));
2132 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2133
2134 sum.InOctetsValidated += tmp.InOctetsValidated;
2135 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2136 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2137 sum.InPktsDelayed += tmp.InPktsDelayed;
2138 sum.InPktsOK += tmp.InPktsOK;
2139 sum.InPktsInvalid += tmp.InPktsInvalid;
2140 sum.InPktsLate += tmp.InPktsLate;
2141 sum.InPktsNotValid += tmp.InPktsNotValid;
2142 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2143 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2144 }
2145
2146 if (nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, sum.InOctetsValidated) ||
2147 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, sum.InOctetsDecrypted) ||
2148 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, sum.InPktsUnchecked) ||
2149 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, sum.InPktsDelayed) ||
2150 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2151 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2152 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, sum.InPktsLate) ||
2153 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2154 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2155 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2156 return -EMSGSIZE;
2157
2158 return 0;
2159}
2160
2161static int copy_tx_sc_stats(struct sk_buff *skb,
2162 struct pcpu_tx_sc_stats __percpu *pstats)
2163{
2164 struct macsec_tx_sc_stats sum = {0, };
2165 int cpu;
2166
2167 for_each_possible_cpu(cpu) {
2168 const struct pcpu_tx_sc_stats *stats;
2169 struct macsec_tx_sc_stats tmp;
2170 unsigned int start;
2171
2172 stats = per_cpu_ptr(pstats, cpu);
2173 do {
2174 start = u64_stats_fetch_begin_irq(&stats->syncp);
2175 memcpy(&tmp, &stats->stats, sizeof(tmp));
2176 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2177
2178 sum.OutPktsProtected += tmp.OutPktsProtected;
2179 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2180 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2181 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2182 }
2183
2184 if (nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2185 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted) ||
2186 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, sum.OutOctetsProtected) ||
2187 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, sum.OutOctetsEncrypted))
2188 return -EMSGSIZE;
2189
2190 return 0;
2191}
2192
2193static int copy_secy_stats(struct sk_buff *skb,
2194 struct pcpu_secy_stats __percpu *pstats)
2195{
2196 struct macsec_dev_stats sum = {0, };
2197 int cpu;
2198
2199 for_each_possible_cpu(cpu) {
2200 const struct pcpu_secy_stats *stats;
2201 struct macsec_dev_stats tmp;
2202 unsigned int start;
2203
2204 stats = per_cpu_ptr(pstats, cpu);
2205 do {
2206 start = u64_stats_fetch_begin_irq(&stats->syncp);
2207 memcpy(&tmp, &stats->stats, sizeof(tmp));
2208 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2209
2210 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2211 sum.InPktsUntagged += tmp.InPktsUntagged;
2212 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2213 sum.InPktsNoTag += tmp.InPktsNoTag;
2214 sum.InPktsBadTag += tmp.InPktsBadTag;
2215 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2216 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2217 sum.InPktsOverrun += tmp.InPktsOverrun;
2218 }
2219
2220 if (nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, sum.OutPktsUntagged) ||
2221 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, sum.InPktsUntagged) ||
2222 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, sum.OutPktsTooLong) ||
2223 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, sum.InPktsNoTag) ||
2224 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, sum.InPktsBadTag) ||
2225 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, sum.InPktsUnknownSCI) ||
2226 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, sum.InPktsNoSCI) ||
2227 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, sum.InPktsOverrun))
2228 return -EMSGSIZE;
2229
2230 return 0;
2231}
2232
2233static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2234{
2235 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2236 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2237
2238 if (!secy_nest)
2239 return 1;
2240
2241 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci) ||
2242 nla_put_u64(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2243 MACSEC_DEFAULT_CIPHER_ID) ||
2244 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2245 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2246 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2247 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2248 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2249 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2250 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2251 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2252 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2253 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2254 goto cancel;
2255
2256 if (secy->replay_protect) {
2257 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2258 goto cancel;
2259 }
2260
2261 nla_nest_end(skb, secy_nest);
2262 return 0;
2263
2264cancel:
2265 nla_nest_cancel(skb, secy_nest);
2266 return 1;
2267}
2268
2269static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2270 struct sk_buff *skb, struct netlink_callback *cb)
2271{
2272 struct macsec_rx_sc *rx_sc;
2273 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2274 struct nlattr *txsa_list, *rxsc_list;
2275 int i, j;
2276 void *hdr;
2277 struct nlattr *attr;
2278
2279 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2280 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2281 if (!hdr)
2282 return -EMSGSIZE;
2283
2284 genl_dump_check_consistent(cb, hdr, &macsec_fam);
2285
2286 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2287 goto nla_put_failure;
2288
2289 if (nla_put_secy(secy, skb))
2290 goto nla_put_failure;
2291
2292 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2293 if (!attr)
2294 goto nla_put_failure;
2295 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2296 nla_nest_cancel(skb, attr);
2297 goto nla_put_failure;
2298 }
2299 nla_nest_end(skb, attr);
2300
2301 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2302 if (!attr)
2303 goto nla_put_failure;
2304 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2305 nla_nest_cancel(skb, attr);
2306 goto nla_put_failure;
2307 }
2308 nla_nest_end(skb, attr);
2309
2310 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2311 if (!txsa_list)
2312 goto nla_put_failure;
2313 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2314 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2315 struct nlattr *txsa_nest;
2316
2317 if (!tx_sa)
2318 continue;
2319
2320 txsa_nest = nla_nest_start(skb, j++);
2321 if (!txsa_nest) {
2322 nla_nest_cancel(skb, txsa_list);
2323 goto nla_put_failure;
2324 }
2325
2326 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2327 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2328 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2329 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2330 nla_nest_cancel(skb, txsa_nest);
2331 nla_nest_cancel(skb, txsa_list);
2332 goto nla_put_failure;
2333 }
2334
2335 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2336 if (!attr) {
2337 nla_nest_cancel(skb, txsa_nest);
2338 nla_nest_cancel(skb, txsa_list);
2339 goto nla_put_failure;
2340 }
2341 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2342 nla_nest_cancel(skb, attr);
2343 nla_nest_cancel(skb, txsa_nest);
2344 nla_nest_cancel(skb, txsa_list);
2345 goto nla_put_failure;
2346 }
2347 nla_nest_end(skb, attr);
2348
2349 nla_nest_end(skb, txsa_nest);
2350 }
2351 nla_nest_end(skb, txsa_list);
2352
2353 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2354 if (!rxsc_list)
2355 goto nla_put_failure;
2356
2357 j = 1;
2358 for_each_rxsc_rtnl(secy, rx_sc) {
2359 int k;
2360 struct nlattr *rxsa_list;
2361 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2362
2363 if (!rxsc_nest) {
2364 nla_nest_cancel(skb, rxsc_list);
2365 goto nla_put_failure;
2366 }
2367
2368 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2369 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci)) {
2370 nla_nest_cancel(skb, rxsc_nest);
2371 nla_nest_cancel(skb, rxsc_list);
2372 goto nla_put_failure;
2373 }
2374
2375 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2376 if (!attr) {
2377 nla_nest_cancel(skb, rxsc_nest);
2378 nla_nest_cancel(skb, rxsc_list);
2379 goto nla_put_failure;
2380 }
2381 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2382 nla_nest_cancel(skb, attr);
2383 nla_nest_cancel(skb, rxsc_nest);
2384 nla_nest_cancel(skb, rxsc_list);
2385 goto nla_put_failure;
2386 }
2387 nla_nest_end(skb, attr);
2388
2389 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2390 if (!rxsa_list) {
2391 nla_nest_cancel(skb, rxsc_nest);
2392 nla_nest_cancel(skb, rxsc_list);
2393 goto nla_put_failure;
2394 }
2395
2396 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2397 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2398 struct nlattr *rxsa_nest;
2399
2400 if (!rx_sa)
2401 continue;
2402
2403 rxsa_nest = nla_nest_start(skb, k++);
2404 if (!rxsa_nest) {
2405 nla_nest_cancel(skb, rxsa_list);
2406 nla_nest_cancel(skb, rxsc_nest);
2407 nla_nest_cancel(skb, rxsc_list);
2408 goto nla_put_failure;
2409 }
2410
2411 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2412 if (!attr) {
2413 nla_nest_cancel(skb, rxsa_list);
2414 nla_nest_cancel(skb, rxsc_nest);
2415 nla_nest_cancel(skb, rxsc_list);
2416 goto nla_put_failure;
2417 }
2418 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2419 nla_nest_cancel(skb, attr);
2420 nla_nest_cancel(skb, rxsa_list);
2421 nla_nest_cancel(skb, rxsc_nest);
2422 nla_nest_cancel(skb, rxsc_list);
2423 goto nla_put_failure;
2424 }
2425 nla_nest_end(skb, attr);
2426
2427 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2428 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2429 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2430 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2431 nla_nest_cancel(skb, rxsa_nest);
2432 nla_nest_cancel(skb, rxsc_nest);
2433 nla_nest_cancel(skb, rxsc_list);
2434 goto nla_put_failure;
2435 }
2436 nla_nest_end(skb, rxsa_nest);
2437 }
2438
2439 nla_nest_end(skb, rxsa_list);
2440 nla_nest_end(skb, rxsc_nest);
2441 }
2442
2443 nla_nest_end(skb, rxsc_list);
2444
2445 genlmsg_end(skb, hdr);
2446
2447 return 0;
2448
2449nla_put_failure:
2450 genlmsg_cancel(skb, hdr);
2451 return -EMSGSIZE;
2452}
2453
2454static int macsec_generation = 1; /* protected by RTNL */
2455
2456static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2457{
2458 struct net *net = sock_net(skb->sk);
2459 struct net_device *dev;
2460 int dev_idx, d;
2461
2462 dev_idx = cb->args[0];
2463
2464 d = 0;
2465 rtnl_lock();
2466
2467 cb->seq = macsec_generation;
2468
2469 for_each_netdev(net, dev) {
2470 struct macsec_secy *secy;
2471
2472 if (d < dev_idx)
2473 goto next;
2474
2475 if (!netif_is_macsec(dev))
2476 goto next;
2477
2478 secy = &macsec_priv(dev)->secy;
2479 if (dump_secy(secy, dev, skb, cb) < 0)
2480 goto done;
2481next:
2482 d++;
2483 }
2484
2485done:
2486 rtnl_unlock();
2487 cb->args[0] = d;
2488 return skb->len;
2489}
2490
2491static const struct genl_ops macsec_genl_ops[] = {
2492 {
2493 .cmd = MACSEC_CMD_GET_TXSC,
2494 .dumpit = macsec_dump_txsc,
2495 .policy = macsec_genl_policy,
2496 },
2497 {
2498 .cmd = MACSEC_CMD_ADD_RXSC,
2499 .doit = macsec_add_rxsc,
2500 .policy = macsec_genl_policy,
2501 .flags = GENL_ADMIN_PERM,
2502 },
2503 {
2504 .cmd = MACSEC_CMD_DEL_RXSC,
2505 .doit = macsec_del_rxsc,
2506 .policy = macsec_genl_policy,
2507 .flags = GENL_ADMIN_PERM,
2508 },
2509 {
2510 .cmd = MACSEC_CMD_UPD_RXSC,
2511 .doit = macsec_upd_rxsc,
2512 .policy = macsec_genl_policy,
2513 .flags = GENL_ADMIN_PERM,
2514 },
2515 {
2516 .cmd = MACSEC_CMD_ADD_TXSA,
2517 .doit = macsec_add_txsa,
2518 .policy = macsec_genl_policy,
2519 .flags = GENL_ADMIN_PERM,
2520 },
2521 {
2522 .cmd = MACSEC_CMD_DEL_TXSA,
2523 .doit = macsec_del_txsa,
2524 .policy = macsec_genl_policy,
2525 .flags = GENL_ADMIN_PERM,
2526 },
2527 {
2528 .cmd = MACSEC_CMD_UPD_TXSA,
2529 .doit = macsec_upd_txsa,
2530 .policy = macsec_genl_policy,
2531 .flags = GENL_ADMIN_PERM,
2532 },
2533 {
2534 .cmd = MACSEC_CMD_ADD_RXSA,
2535 .doit = macsec_add_rxsa,
2536 .policy = macsec_genl_policy,
2537 .flags = GENL_ADMIN_PERM,
2538 },
2539 {
2540 .cmd = MACSEC_CMD_DEL_RXSA,
2541 .doit = macsec_del_rxsa,
2542 .policy = macsec_genl_policy,
2543 .flags = GENL_ADMIN_PERM,
2544 },
2545 {
2546 .cmd = MACSEC_CMD_UPD_RXSA,
2547 .doit = macsec_upd_rxsa,
2548 .policy = macsec_genl_policy,
2549 .flags = GENL_ADMIN_PERM,
2550 },
2551};
2552
2553static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2554 struct net_device *dev)
2555{
2556 struct macsec_dev *macsec = netdev_priv(dev);
2557 struct macsec_secy *secy = &macsec->secy;
2558 struct pcpu_secy_stats *secy_stats;
2559 int ret, len;
2560
2561 /* 10.5 */
2562 if (!secy->protect_frames) {
2563 secy_stats = this_cpu_ptr(macsec->stats);
2564 u64_stats_update_begin(&secy_stats->syncp);
2565 secy_stats->stats.OutPktsUntagged++;
2566 u64_stats_update_end(&secy_stats->syncp);
2567 len = skb->len;
2568 ret = dev_queue_xmit(skb);
2569 count_tx(dev, ret, len);
2570 return ret;
2571 }
2572
2573 if (!secy->operational) {
2574 kfree_skb(skb);
2575 dev->stats.tx_dropped++;
2576 return NETDEV_TX_OK;
2577 }
2578
2579 skb = macsec_encrypt(skb, dev);
2580 if (IS_ERR(skb)) {
2581 if (PTR_ERR(skb) != -EINPROGRESS)
2582 dev->stats.tx_dropped++;
2583 return NETDEV_TX_OK;
2584 }
2585
2586 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2587
2588 macsec_encrypt_finish(skb, dev);
2589 len = skb->len;
2590 ret = dev_queue_xmit(skb);
2591 count_tx(dev, ret, len);
2592 return ret;
2593}
2594
2595#define MACSEC_FEATURES \
2596 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2597static int macsec_dev_init(struct net_device *dev)
2598{
2599 struct macsec_dev *macsec = macsec_priv(dev);
2600 struct net_device *real_dev = macsec->real_dev;
2601
2602 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2603 if (!dev->tstats)
2604 return -ENOMEM;
2605
2606 dev->features = real_dev->features & MACSEC_FEATURES;
2607 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2608
2609 dev->needed_headroom = real_dev->needed_headroom +
2610 MACSEC_NEEDED_HEADROOM;
2611 dev->needed_tailroom = real_dev->needed_tailroom +
2612 MACSEC_NEEDED_TAILROOM;
2613
2614 if (is_zero_ether_addr(dev->dev_addr))
2615 eth_hw_addr_inherit(dev, real_dev);
2616 if (is_zero_ether_addr(dev->broadcast))
2617 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2618
2619 return 0;
2620}
2621
2622static void macsec_dev_uninit(struct net_device *dev)
2623{
2624 free_percpu(dev->tstats);
2625}
2626
2627static netdev_features_t macsec_fix_features(struct net_device *dev,
2628 netdev_features_t features)
2629{
2630 struct macsec_dev *macsec = macsec_priv(dev);
2631 struct net_device *real_dev = macsec->real_dev;
2632
2633 features &= real_dev->features & MACSEC_FEATURES;
2634 features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2635
2636 return features;
2637}
2638
2639static int macsec_dev_open(struct net_device *dev)
2640{
2641 struct macsec_dev *macsec = macsec_priv(dev);
2642 struct net_device *real_dev = macsec->real_dev;
2643 int err;
2644
2645 if (!(real_dev->flags & IFF_UP))
2646 return -ENETDOWN;
2647
2648 err = dev_uc_add(real_dev, dev->dev_addr);
2649 if (err < 0)
2650 return err;
2651
2652 if (dev->flags & IFF_ALLMULTI) {
2653 err = dev_set_allmulti(real_dev, 1);
2654 if (err < 0)
2655 goto del_unicast;
2656 }
2657
2658 if (dev->flags & IFF_PROMISC) {
2659 err = dev_set_promiscuity(real_dev, 1);
2660 if (err < 0)
2661 goto clear_allmulti;
2662 }
2663
2664 if (netif_carrier_ok(real_dev))
2665 netif_carrier_on(dev);
2666
2667 return 0;
2668clear_allmulti:
2669 if (dev->flags & IFF_ALLMULTI)
2670 dev_set_allmulti(real_dev, -1);
2671del_unicast:
2672 dev_uc_del(real_dev, dev->dev_addr);
2673 netif_carrier_off(dev);
2674 return err;
2675}
2676
2677static int macsec_dev_stop(struct net_device *dev)
2678{
2679 struct macsec_dev *macsec = macsec_priv(dev);
2680 struct net_device *real_dev = macsec->real_dev;
2681
2682 netif_carrier_off(dev);
2683
2684 dev_mc_unsync(real_dev, dev);
2685 dev_uc_unsync(real_dev, dev);
2686
2687 if (dev->flags & IFF_ALLMULTI)
2688 dev_set_allmulti(real_dev, -1);
2689
2690 if (dev->flags & IFF_PROMISC)
2691 dev_set_promiscuity(real_dev, -1);
2692
2693 dev_uc_del(real_dev, dev->dev_addr);
2694
2695 return 0;
2696}
2697
2698static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2699{
2700 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2701
2702 if (!(dev->flags & IFF_UP))
2703 return;
2704
2705 if (change & IFF_ALLMULTI)
2706 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2707
2708 if (change & IFF_PROMISC)
2709 dev_set_promiscuity(real_dev,
2710 dev->flags & IFF_PROMISC ? 1 : -1);
2711}
2712
2713static void macsec_dev_set_rx_mode(struct net_device *dev)
2714{
2715 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2716
2717 dev_mc_sync(real_dev, dev);
2718 dev_uc_sync(real_dev, dev);
2719}
2720
2721static int macsec_set_mac_address(struct net_device *dev, void *p)
2722{
2723 struct macsec_dev *macsec = macsec_priv(dev);
2724 struct net_device *real_dev = macsec->real_dev;
2725 struct sockaddr *addr = p;
2726 int err;
2727
2728 if (!is_valid_ether_addr(addr->sa_data))
2729 return -EADDRNOTAVAIL;
2730
2731 if (!(dev->flags & IFF_UP))
2732 goto out;
2733
2734 err = dev_uc_add(real_dev, addr->sa_data);
2735 if (err < 0)
2736 return err;
2737
2738 dev_uc_del(real_dev, dev->dev_addr);
2739
2740out:
2741 ether_addr_copy(dev->dev_addr, addr->sa_data);
2742 return 0;
2743}
2744
2745static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2746{
2747 struct macsec_dev *macsec = macsec_priv(dev);
2748 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2749
2750 if (macsec->real_dev->mtu - extra < new_mtu)
2751 return -ERANGE;
2752
2753 dev->mtu = new_mtu;
2754
2755 return 0;
2756}
2757
2758static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev,
2759 struct rtnl_link_stats64 *s)
2760{
2761 int cpu;
2762
2763 if (!dev->tstats)
2764 return s;
2765
2766 for_each_possible_cpu(cpu) {
2767 struct pcpu_sw_netstats *stats;
2768 struct pcpu_sw_netstats tmp;
2769 int start;
2770
2771 stats = per_cpu_ptr(dev->tstats, cpu);
2772 do {
2773 start = u64_stats_fetch_begin_irq(&stats->syncp);
2774 tmp.rx_packets = stats->rx_packets;
2775 tmp.rx_bytes = stats->rx_bytes;
2776 tmp.tx_packets = stats->tx_packets;
2777 tmp.tx_bytes = stats->tx_bytes;
2778 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2779
2780 s->rx_packets += tmp.rx_packets;
2781 s->rx_bytes += tmp.rx_bytes;
2782 s->tx_packets += tmp.tx_packets;
2783 s->tx_bytes += tmp.tx_bytes;
2784 }
2785
2786 s->rx_dropped = dev->stats.rx_dropped;
2787 s->tx_dropped = dev->stats.tx_dropped;
2788
2789 return s;
2790}
2791
2792static int macsec_get_iflink(const struct net_device *dev)
2793{
2794 return macsec_priv(dev)->real_dev->ifindex;
2795}
2796
2797static const struct net_device_ops macsec_netdev_ops = {
2798 .ndo_init = macsec_dev_init,
2799 .ndo_uninit = macsec_dev_uninit,
2800 .ndo_open = macsec_dev_open,
2801 .ndo_stop = macsec_dev_stop,
2802 .ndo_fix_features = macsec_fix_features,
2803 .ndo_change_mtu = macsec_change_mtu,
2804 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2805 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2806 .ndo_set_mac_address = macsec_set_mac_address,
2807 .ndo_start_xmit = macsec_start_xmit,
2808 .ndo_get_stats64 = macsec_get_stats64,
2809 .ndo_get_iflink = macsec_get_iflink,
2810};
2811
2812static const struct device_type macsec_type = {
2813 .name = "macsec",
2814};
2815
2816static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2817 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2818 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2819 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2820 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2821 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2822 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2823 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
2824 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
2825 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
2826 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
2827 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
2828 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
2829};
2830
2831static void macsec_free_netdev(struct net_device *dev)
2832{
2833 struct macsec_dev *macsec = macsec_priv(dev);
2834 struct net_device *real_dev = macsec->real_dev;
2835
2836 free_percpu(macsec->stats);
2837 free_percpu(macsec->secy.tx_sc.stats);
2838
2839 dev_put(real_dev);
2840 free_netdev(dev);
2841}
2842
2843static void macsec_setup(struct net_device *dev)
2844{
2845 ether_setup(dev);
2846 dev->tx_queue_len = 0;
2847 dev->netdev_ops = &macsec_netdev_ops;
2848 dev->destructor = macsec_free_netdev;
2849
2850 eth_zero_addr(dev->broadcast);
2851}
2852
2853static void macsec_changelink_common(struct net_device *dev,
2854 struct nlattr *data[])
2855{
2856 struct macsec_secy *secy;
2857 struct macsec_tx_sc *tx_sc;
2858
2859 secy = &macsec_priv(dev)->secy;
2860 tx_sc = &secy->tx_sc;
2861
2862 if (data[IFLA_MACSEC_ENCODING_SA]) {
2863 struct macsec_tx_sa *tx_sa;
2864
2865 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
2866 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
2867
2868 secy->operational = tx_sa && tx_sa->active;
2869 }
2870
2871 if (data[IFLA_MACSEC_WINDOW])
2872 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
2873
2874 if (data[IFLA_MACSEC_ENCRYPT])
2875 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
2876
2877 if (data[IFLA_MACSEC_PROTECT])
2878 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
2879
2880 if (data[IFLA_MACSEC_INC_SCI])
2881 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
2882
2883 if (data[IFLA_MACSEC_ES])
2884 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
2885
2886 if (data[IFLA_MACSEC_SCB])
2887 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
2888
2889 if (data[IFLA_MACSEC_REPLAY_PROTECT])
2890 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
2891
2892 if (data[IFLA_MACSEC_VALIDATION])
2893 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
2894}
2895
2896static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
2897 struct nlattr *data[])
2898{
2899 if (!data)
2900 return 0;
2901
2902 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
2903 data[IFLA_MACSEC_ICV_LEN] ||
2904 data[IFLA_MACSEC_SCI] ||
2905 data[IFLA_MACSEC_PORT])
2906 return -EINVAL;
2907
2908 macsec_changelink_common(dev, data);
2909
2910 return 0;
2911}
2912
2913static void macsec_del_dev(struct macsec_dev *macsec)
2914{
2915 int i;
2916
2917 while (macsec->secy.rx_sc) {
2918 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
2919
2920 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
2921 free_rx_sc(rx_sc);
2922 }
2923
2924 for (i = 0; i < MACSEC_NUM_AN; i++) {
2925 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
2926
2927 if (sa) {
2928 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
2929 clear_tx_sa(sa);
2930 }
2931 }
2932}
2933
2934static void macsec_dellink(struct net_device *dev, struct list_head *head)
2935{
2936 struct macsec_dev *macsec = macsec_priv(dev);
2937 struct net_device *real_dev = macsec->real_dev;
2938 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
2939
2940 macsec_generation++;
2941
2942 unregister_netdevice_queue(dev, head);
2943 list_del_rcu(&macsec->secys);
2944 if (list_empty(&rxd->secys)) {
2945 netdev_rx_handler_unregister(real_dev);
2946 kfree(rxd);
2947 }
2948
2949 macsec_del_dev(macsec);
2950}
2951
2952static int register_macsec_dev(struct net_device *real_dev,
2953 struct net_device *dev)
2954{
2955 struct macsec_dev *macsec = macsec_priv(dev);
2956 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
2957
2958 if (!rxd) {
2959 int err;
2960
2961 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
2962 if (!rxd)
2963 return -ENOMEM;
2964
2965 INIT_LIST_HEAD(&rxd->secys);
2966
2967 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
2968 rxd);
2969 if (err < 0) {
2970 kfree(rxd);
2971 return err;
2972 }
2973 }
2974
2975 list_add_tail_rcu(&macsec->secys, &rxd->secys);
2976 return 0;
2977}
2978
2979static bool sci_exists(struct net_device *dev, sci_t sci)
2980{
2981 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
2982 struct macsec_dev *macsec;
2983
2984 list_for_each_entry(macsec, &rxd->secys, secys) {
2985 if (macsec->secy.sci == sci)
2986 return true;
2987 }
2988
2989 return false;
2990}
2991
2992static sci_t dev_to_sci(struct net_device *dev, __be16 port)
2993{
2994 return make_sci(dev->dev_addr, port);
2995}
2996
2997static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
2998{
2999 struct macsec_dev *macsec = macsec_priv(dev);
3000 struct macsec_secy *secy = &macsec->secy;
3001
3002 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3003 if (!macsec->stats)
3004 return -ENOMEM;
3005
3006 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3007 if (!secy->tx_sc.stats) {
3008 free_percpu(macsec->stats);
3009 return -ENOMEM;
3010 }
3011
3012 if (sci == MACSEC_UNDEF_SCI)
3013 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3014
3015 secy->netdev = dev;
3016 secy->operational = true;
3017 secy->key_len = DEFAULT_SAK_LEN;
3018 secy->icv_len = icv_len;
3019 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3020 secy->protect_frames = true;
3021 secy->replay_protect = false;
3022
3023 secy->sci = sci;
3024 secy->tx_sc.active = true;
3025 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3026 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3027 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3028 secy->tx_sc.end_station = false;
3029 secy->tx_sc.scb = false;
3030
3031 return 0;
3032}
3033
3034static int macsec_newlink(struct net *net, struct net_device *dev,
3035 struct nlattr *tb[], struct nlattr *data[])
3036{
3037 struct macsec_dev *macsec = macsec_priv(dev);
3038 struct net_device *real_dev;
3039 int err;
3040 sci_t sci;
3041 u8 icv_len = DEFAULT_ICV_LEN;
3042 rx_handler_func_t *rx_handler;
3043
3044 if (!tb[IFLA_LINK])
3045 return -EINVAL;
3046 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3047 if (!real_dev)
3048 return -ENODEV;
3049
3050 dev->priv_flags |= IFF_MACSEC;
3051
3052 macsec->real_dev = real_dev;
3053
3054 if (data && data[IFLA_MACSEC_ICV_LEN])
3055 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3056 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3057
3058 rx_handler = rtnl_dereference(real_dev->rx_handler);
3059 if (rx_handler && rx_handler != macsec_handle_frame)
3060 return -EBUSY;
3061
3062 err = register_netdevice(dev);
3063 if (err < 0)
3064 return err;
3065
3066 /* need to be already registered so that ->init has run and
3067 * the MAC addr is set
3068 */
3069 if (data && data[IFLA_MACSEC_SCI])
3070 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3071 else if (data && data[IFLA_MACSEC_PORT])
3072 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3073 else
3074 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3075
3076 if (rx_handler && sci_exists(real_dev, sci)) {
3077 err = -EBUSY;
3078 goto unregister;
3079 }
3080
3081 err = macsec_add_dev(dev, sci, icv_len);
3082 if (err)
3083 goto unregister;
3084
3085 if (data)
3086 macsec_changelink_common(dev, data);
3087
3088 err = register_macsec_dev(real_dev, dev);
3089 if (err < 0)
3090 goto del_dev;
3091
3092 macsec_generation++;
3093
3094 dev_hold(real_dev);
3095
3096 return 0;
3097
3098del_dev:
3099 macsec_del_dev(macsec);
3100unregister:
3101 unregister_netdevice(dev);
3102 return err;
3103}
3104
3105static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
3106{
3107 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3108 u8 icv_len = DEFAULT_ICV_LEN;
3109 int flag;
3110 bool es, scb, sci;
3111
3112 if (!data)
3113 return 0;
3114
3115 if (data[IFLA_MACSEC_CIPHER_SUITE])
3116 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3117
3118 if (data[IFLA_MACSEC_ICV_LEN])
3119 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3120
3121 switch (csid) {
3122 case MACSEC_DEFAULT_CIPHER_ID:
3123 case MACSEC_DEFAULT_CIPHER_ALT:
3124 if (icv_len < MACSEC_MIN_ICV_LEN ||
3125 icv_len > MACSEC_MAX_ICV_LEN)
3126 return -EINVAL;
3127 break;
3128 default:
3129 return -EINVAL;
3130 }
3131
3132 if (data[IFLA_MACSEC_ENCODING_SA]) {
3133 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3134 return -EINVAL;
3135 }
3136
3137 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3138 flag < IFLA_MACSEC_VALIDATION;
3139 flag++) {
3140 if (data[flag]) {
3141 if (nla_get_u8(data[flag]) > 1)
3142 return -EINVAL;
3143 }
3144 }
3145
3146 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3147 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3148 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3149
3150 if ((sci && (scb || es)) || (scb && es))
3151 return -EINVAL;
3152
3153 if (data[IFLA_MACSEC_VALIDATION] &&
3154 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3155 return -EINVAL;
3156
3157 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3158 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3159 !data[IFLA_MACSEC_WINDOW])
3160 return -EINVAL;
3161
3162 return 0;
3163}
3164
3165static struct net *macsec_get_link_net(const struct net_device *dev)
3166{
3167 return dev_net(macsec_priv(dev)->real_dev);
3168}
3169
3170static size_t macsec_get_size(const struct net_device *dev)
3171{
3172 return 0 +
3173 nla_total_size(8) + /* SCI */
3174 nla_total_size(1) + /* ICV_LEN */
3175 nla_total_size(8) + /* CIPHER_SUITE */
3176 nla_total_size(4) + /* WINDOW */
3177 nla_total_size(1) + /* ENCODING_SA */
3178 nla_total_size(1) + /* ENCRYPT */
3179 nla_total_size(1) + /* PROTECT */
3180 nla_total_size(1) + /* INC_SCI */
3181 nla_total_size(1) + /* ES */
3182 nla_total_size(1) + /* SCB */
3183 nla_total_size(1) + /* REPLAY_PROTECT */
3184 nla_total_size(1) + /* VALIDATION */
3185 0;
3186}
3187
3188static int macsec_fill_info(struct sk_buff *skb,
3189 const struct net_device *dev)
3190{
3191 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3192 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3193
3194 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci) ||
3195 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3196 nla_put_u64(skb, IFLA_MACSEC_CIPHER_SUITE,
3197 MACSEC_DEFAULT_CIPHER_ID) ||
3198 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3199 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3200 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3201 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3202 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3203 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3204 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3205 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3206 0)
3207 goto nla_put_failure;
3208
3209 if (secy->replay_protect) {
3210 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3211 goto nla_put_failure;
3212 }
3213
3214 return 0;
3215
3216nla_put_failure:
3217 return -EMSGSIZE;
3218}
3219
3220static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3221 .kind = "macsec",
3222 .priv_size = sizeof(struct macsec_dev),
3223 .maxtype = IFLA_MACSEC_MAX,
3224 .policy = macsec_rtnl_policy,
3225 .setup = macsec_setup,
3226 .validate = macsec_validate_attr,
3227 .newlink = macsec_newlink,
3228 .changelink = macsec_changelink,
3229 .dellink = macsec_dellink,
3230 .get_size = macsec_get_size,
3231 .fill_info = macsec_fill_info,
3232 .get_link_net = macsec_get_link_net,
3233};
3234
3235static bool is_macsec_master(struct net_device *dev)
3236{
3237 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3238}
3239
3240static int macsec_notify(struct notifier_block *this, unsigned long event,
3241 void *ptr)
3242{
3243 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3244 LIST_HEAD(head);
3245
3246 if (!is_macsec_master(real_dev))
3247 return NOTIFY_DONE;
3248
3249 switch (event) {
3250 case NETDEV_UNREGISTER: {
3251 struct macsec_dev *m, *n;
3252 struct macsec_rxh_data *rxd;
3253
3254 rxd = macsec_data_rtnl(real_dev);
3255 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3256 macsec_dellink(m->secy.netdev, &head);
3257 }
3258 unregister_netdevice_many(&head);
3259 break;
3260 }
3261 case NETDEV_CHANGEMTU: {
3262 struct macsec_dev *m;
3263 struct macsec_rxh_data *rxd;
3264
3265 rxd = macsec_data_rtnl(real_dev);
3266 list_for_each_entry(m, &rxd->secys, secys) {
3267 struct net_device *dev = m->secy.netdev;
3268 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3269 macsec_extra_len(true));
3270
3271 if (dev->mtu > mtu)
3272 dev_set_mtu(dev, mtu);
3273 }
3274 }
3275 }
3276
3277 return NOTIFY_OK;
3278}
3279
3280static struct notifier_block macsec_notifier = {
3281 .notifier_call = macsec_notify,
3282};
3283
3284static int __init macsec_init(void)
3285{
3286 int err;
3287
3288 pr_info("MACsec IEEE 802.1AE\n");
3289 err = register_netdevice_notifier(&macsec_notifier);
3290 if (err)
3291 return err;
3292
3293 err = rtnl_link_register(&macsec_link_ops);
3294 if (err)
3295 goto notifier;
3296
3297 err = genl_register_family_with_ops(&macsec_fam, macsec_genl_ops);
3298 if (err)
3299 goto rtnl;
3300
3301 return 0;
3302
3303rtnl:
3304 rtnl_link_unregister(&macsec_link_ops);
3305notifier:
3306 unregister_netdevice_notifier(&macsec_notifier);
3307 return err;
3308}
3309
3310static void __exit macsec_exit(void)
3311{
3312 genl_unregister_family(&macsec_fam);
3313 rtnl_link_unregister(&macsec_link_ops);
3314 unregister_netdevice_notifier(&macsec_notifier);
3315}
3316
3317module_init(macsec_init);
3318module_exit(macsec_exit);
3319
3320MODULE_ALIAS_RTNL_LINK("macsec");
3321
3322MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3323MODULE_LICENSE("GPL v2");