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Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / drivers / net / macsec.c
blob1bc1e5993f56e08cf4fe2996743068d777d15723
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
31 struct 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
64 struct gcm_iv_xpn {
65 union {
66 u8 short_secure_channel_id[4];
67 ssci_t ssci;
68 };
69 __be64 pn;
70 } __packed;
71
72 struct 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
82 struct 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 */
99 struct 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 */
114 struct macsec_rxh_data {
115 struct list_head secys;
116 };
117
118 static struct macsec_dev *macsec_priv(const struct net_device *dev)
119 {
120 return (struct macsec_dev *)netdev_priv(dev);
121 }
122
123 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
124 {
125 return rcu_dereference_bh(dev->rx_handler_data);
126 }
127
128 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
129 {
130 return rtnl_dereference(dev->rx_handler_data);
131 }
132
133 struct 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
144 static 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
157 static void free_rx_sc_rcu(struct rcu_head *head)
158 {
159 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
160
161 free_percpu(rx_sc->stats);
162 kfree(rx_sc);
163 }
164
165 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
166 {
167 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
168 }
169
170 static void macsec_rxsc_put(struct macsec_rx_sc *sc)
171 {
172 if (refcount_dec_and_test(&sc->refcnt))
173 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
174 }
175
176 static void free_rxsa(struct rcu_head *head)
177 {
178 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
179
180 crypto_free_aead(sa->key.tfm);
181 free_percpu(sa->stats);
182 kfree(sa);
183 }
184
185 static void macsec_rxsa_put(struct macsec_rx_sa *sa)
186 {
187 if (refcount_dec_and_test(&sa->refcnt))
188 call_rcu(&sa->rcu, free_rxsa);
189 }
190
191 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
192 {
193 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
194
195 if (!sa || !sa->active)
196 return NULL;
197
198 if (!refcount_inc_not_zero(&sa->refcnt))
199 return NULL;
200
201 return sa;
202 }
203
204 static void free_txsa(struct rcu_head *head)
205 {
206 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
207
208 crypto_free_aead(sa->key.tfm);
209 free_percpu(sa->stats);
210 kfree(sa);
211 }
212
213 static void macsec_txsa_put(struct macsec_tx_sa *sa)
214 {
215 if (refcount_dec_and_test(&sa->refcnt))
216 call_rcu(&sa->rcu, free_txsa);
217 }
218
219 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
220 {
221 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
222 return (struct macsec_cb *)skb->cb;
223 }
224
225 #define MACSEC_PORT_SCB (0x0000)
226 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
227 #define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
228
229 #define MACSEC_GCM_AES_128_SAK_LEN 16
230 #define MACSEC_GCM_AES_256_SAK_LEN 32
231
232 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
233 #define DEFAULT_XPN false
234 #define DEFAULT_SEND_SCI true
235 #define DEFAULT_ENCRYPT false
236 #define DEFAULT_ENCODING_SA 0
237 #define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1))
238
239 static sci_t make_sci(const u8 *addr, __be16 port)
240 {
241 sci_t sci;
242
243 memcpy(&sci, addr, ETH_ALEN);
244 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
245
246 return sci;
247 }
248
249 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
250 {
251 sci_t sci;
252
253 if (sci_present)
254 memcpy(&sci, hdr->secure_channel_id,
255 sizeof(hdr->secure_channel_id));
256 else
257 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
258
259 return sci;
260 }
261
262 static unsigned int macsec_sectag_len(bool sci_present)
263 {
264 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
265 }
266
267 static unsigned int macsec_hdr_len(bool sci_present)
268 {
269 return macsec_sectag_len(sci_present) + ETH_HLEN;
270 }
271
272 static unsigned int macsec_extra_len(bool sci_present)
273 {
274 return macsec_sectag_len(sci_present) + sizeof(__be16);
275 }
276
277 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
278 static void macsec_fill_sectag(struct macsec_eth_header *h,
279 const struct macsec_secy *secy, u32 pn,
280 bool sci_present)
281 {
282 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
283
284 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
285 h->eth.h_proto = htons(ETH_P_MACSEC);
286
287 if (sci_present) {
288 h->tci_an |= MACSEC_TCI_SC;
289 memcpy(&h->secure_channel_id, &secy->sci,
290 sizeof(h->secure_channel_id));
291 } else {
292 if (tx_sc->end_station)
293 h->tci_an |= MACSEC_TCI_ES;
294 if (tx_sc->scb)
295 h->tci_an |= MACSEC_TCI_SCB;
296 }
297
298 h->packet_number = htonl(pn);
299
300 /* with GCM, C/E clear for !encrypt, both set for encrypt */
301 if (tx_sc->encrypt)
302 h->tci_an |= MACSEC_TCI_CONFID;
303 else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN)
304 h->tci_an |= MACSEC_TCI_C;
305
306 h->tci_an |= tx_sc->encoding_sa;
307 }
308
309 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
310 {
311 if (data_len < MIN_NON_SHORT_LEN)
312 h->short_length = data_len;
313 }
314
315 /* Checks if a MACsec interface is being offloaded to an hardware engine */
316 static bool macsec_is_offloaded(struct macsec_dev *macsec)
317 {
318 if (macsec->offload == MACSEC_OFFLOAD_MAC ||
319 macsec->offload == MACSEC_OFFLOAD_PHY)
320 return true;
321
322 return false;
323 }
324
325 /* Checks if underlying layers implement MACsec offloading functions. */
326 static bool macsec_check_offload(enum macsec_offload offload,
327 struct macsec_dev *macsec)
328 {
329 if (!macsec || !macsec->real_dev)
330 return false;
331
332 if (offload == MACSEC_OFFLOAD_PHY)
333 return macsec->real_dev->phydev &&
334 macsec->real_dev->phydev->macsec_ops;
335 else if (offload == MACSEC_OFFLOAD_MAC)
336 return macsec->real_dev->features & NETIF_F_HW_MACSEC &&
337 macsec->real_dev->macsec_ops;
338
339 return false;
340 }
341
342 static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload,
343 struct macsec_dev *macsec,
344 struct macsec_context *ctx)
345 {
346 if (ctx) {
347 memset(ctx, 0, sizeof(*ctx));
348 ctx->offload = offload;
349
350 if (offload == MACSEC_OFFLOAD_PHY)
351 ctx->phydev = macsec->real_dev->phydev;
352 else if (offload == MACSEC_OFFLOAD_MAC)
353 ctx->netdev = macsec->real_dev;
354 }
355
356 if (offload == MACSEC_OFFLOAD_PHY)
357 return macsec->real_dev->phydev->macsec_ops;
358 else
359 return macsec->real_dev->macsec_ops;
360 }
361
362 /* Returns a pointer to the MACsec ops struct if any and updates the MACsec
363 * context device reference if provided.
364 */
365 static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
366 struct macsec_context *ctx)
367 {
368 if (!macsec_check_offload(macsec->offload, macsec))
369 return NULL;
370
371 return __macsec_get_ops(macsec->offload, macsec, ctx);
372 }
373
374 /* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */
375 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn)
376 {
377 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
378 int len = skb->len - 2 * ETH_ALEN;
379 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
380
381 /* a) It comprises at least 17 octets */
382 if (skb->len <= 16)
383 return false;
384
385 /* b) MACsec EtherType: already checked */
386
387 /* c) V bit is clear */
388 if (h->tci_an & MACSEC_TCI_VERSION)
389 return false;
390
391 /* d) ES or SCB => !SC */
392 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
393 (h->tci_an & MACSEC_TCI_SC))
394 return false;
395
396 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
397 if (h->unused)
398 return false;
399
400 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */
401 if (!h->packet_number && !xpn)
402 return false;
403
404 /* length check, f) g) h) i) */
405 if (h->short_length)
406 return len == extra_len + h->short_length;
407 return len >= extra_len + MIN_NON_SHORT_LEN;
408 }
409
410 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
411 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
412
413 static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn,
414 salt_t salt)
415 {
416 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv;
417
418 gcm_iv->ssci = ssci ^ salt.ssci;
419 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn;
420 }
421
422 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
423 {
424 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
425
426 gcm_iv->sci = sci;
427 gcm_iv->pn = htonl(pn);
428 }
429
430 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
431 {
432 return (struct macsec_eth_header *)skb_mac_header(skb);
433 }
434
435 static void __macsec_pn_wrapped(struct macsec_secy *secy,
436 struct macsec_tx_sa *tx_sa)
437 {
438 pr_debug("PN wrapped, transitioning to !oper\n");
439 tx_sa->active = false;
440 if (secy->protect_frames)
441 secy->operational = false;
442 }
443
444 void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
445 {
446 spin_lock_bh(&tx_sa->lock);
447 __macsec_pn_wrapped(secy, tx_sa);
448 spin_unlock_bh(&tx_sa->lock);
449 }
450 EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
451
452 static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
453 struct macsec_secy *secy)
454 {
455 pn_t pn;
456
457 spin_lock_bh(&tx_sa->lock);
458
459 pn = tx_sa->next_pn_halves;
460 if (secy->xpn)
461 tx_sa->next_pn++;
462 else
463 tx_sa->next_pn_halves.lower++;
464
465 if (tx_sa->next_pn == 0)
466 __macsec_pn_wrapped(secy, tx_sa);
467 spin_unlock_bh(&tx_sa->lock);
468
469 return pn;
470 }
471
472 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
473 {
474 struct macsec_dev *macsec = netdev_priv(dev);
475
476 skb->dev = macsec->real_dev;
477 skb_reset_mac_header(skb);
478 skb->protocol = eth_hdr(skb)->h_proto;
479 }
480
481 static unsigned int macsec_msdu_len(struct sk_buff *skb)
482 {
483 struct macsec_dev *macsec = macsec_priv(skb->dev);
484 struct macsec_secy *secy = &macsec->secy;
485 bool sci_present = macsec_skb_cb(skb)->has_sci;
486
487 return skb->len - macsec_hdr_len(sci_present) - secy->icv_len;
488 }
489
490 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
491 struct macsec_tx_sa *tx_sa)
492 {
493 unsigned int msdu_len = macsec_msdu_len(skb);
494 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
495
496 u64_stats_update_begin(&txsc_stats->syncp);
497 if (tx_sc->encrypt) {
498 txsc_stats->stats.OutOctetsEncrypted += msdu_len;
499 txsc_stats->stats.OutPktsEncrypted++;
500 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
501 } else {
502 txsc_stats->stats.OutOctetsProtected += msdu_len;
503 txsc_stats->stats.OutPktsProtected++;
504 this_cpu_inc(tx_sa->stats->OutPktsProtected);
505 }
506 u64_stats_update_end(&txsc_stats->syncp);
507 }
508
509 static void count_tx(struct net_device *dev, int ret, int len)
510 {
511 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN))
512 dev_sw_netstats_tx_add(dev, 1, len);
513 }
514
515 static void macsec_encrypt_done(void *data, int err)
516 {
517 struct sk_buff *skb = data;
518 struct net_device *dev = skb->dev;
519 struct macsec_dev *macsec = macsec_priv(dev);
520 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
521 int len, ret;
522
523 aead_request_free(macsec_skb_cb(skb)->req);
524
525 rcu_read_lock_bh();
526 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
527 /* packet is encrypted/protected so tx_bytes must be calculated */
528 len = macsec_msdu_len(skb) + 2 * ETH_ALEN;
529 macsec_encrypt_finish(skb, dev);
530 ret = dev_queue_xmit(skb);
531 count_tx(dev, ret, len);
532 rcu_read_unlock_bh();
533
534 macsec_txsa_put(sa);
535 dev_put(dev);
536 }
537
538 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
539 unsigned char **iv,
540 struct scatterlist **sg,
541 int num_frags)
542 {
543 size_t size, iv_offset, sg_offset;
544 struct aead_request *req;
545 void *tmp;
546
547 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
548 iv_offset = size;
549 size += GCM_AES_IV_LEN;
550
551 size = ALIGN(size, __alignof__(struct scatterlist));
552 sg_offset = size;
553 size += sizeof(struct scatterlist) * num_frags;
554
555 tmp = kmalloc(size, GFP_ATOMIC);
556 if (!tmp)
557 return NULL;
558
559 *iv = (unsigned char *)(tmp + iv_offset);
560 *sg = (struct scatterlist *)(tmp + sg_offset);
561 req = tmp;
562
563 aead_request_set_tfm(req, tfm);
564
565 return req;
566 }
567
568 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
569 struct net_device *dev)
570 {
571 int ret;
572 struct scatterlist *sg;
573 struct sk_buff *trailer;
574 unsigned char *iv;
575 struct ethhdr *eth;
576 struct macsec_eth_header *hh;
577 size_t unprotected_len;
578 struct aead_request *req;
579 struct macsec_secy *secy;
580 struct macsec_tx_sc *tx_sc;
581 struct macsec_tx_sa *tx_sa;
582 struct macsec_dev *macsec = macsec_priv(dev);
583 bool sci_present;
584 pn_t pn;
585
586 secy = &macsec->secy;
587 tx_sc = &secy->tx_sc;
588
589 /* 10.5.1 TX SA assignment */
590 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
591 if (!tx_sa) {
592 secy->operational = false;
593 kfree_skb(skb);
594 return ERR_PTR(-EINVAL);
595 }
596
597 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
598 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
599 struct sk_buff *nskb = skb_copy_expand(skb,
600 MACSEC_NEEDED_HEADROOM,
601 MACSEC_NEEDED_TAILROOM,
602 GFP_ATOMIC);
603 if (likely(nskb)) {
604 consume_skb(skb);
605 skb = nskb;
606 } else {
607 macsec_txsa_put(tx_sa);
608 kfree_skb(skb);
609 return ERR_PTR(-ENOMEM);
610 }
611 } else {
612 skb = skb_unshare(skb, GFP_ATOMIC);
613 if (!skb) {
614 macsec_txsa_put(tx_sa);
615 return ERR_PTR(-ENOMEM);
616 }
617 }
618
619 unprotected_len = skb->len;
620 eth = eth_hdr(skb);
621 sci_present = macsec_send_sci(secy);
622 hh = skb_push(skb, macsec_extra_len(sci_present));
623 memmove(hh, eth, 2 * ETH_ALEN);
624
625 pn = tx_sa_update_pn(tx_sa, secy);
626 if (pn.full64 == 0) {
627 macsec_txsa_put(tx_sa);
628 kfree_skb(skb);
629 return ERR_PTR(-ENOLINK);
630 }
631 macsec_fill_sectag(hh, secy, pn.lower, sci_present);
632 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
633
634 skb_put(skb, secy->icv_len);
635
636 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
637 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
638
639 u64_stats_update_begin(&secy_stats->syncp);
640 secy_stats->stats.OutPktsTooLong++;
641 u64_stats_update_end(&secy_stats->syncp);
642
643 macsec_txsa_put(tx_sa);
644 kfree_skb(skb);
645 return ERR_PTR(-EINVAL);
646 }
647
648 ret = skb_cow_data(skb, 0, &trailer);
649 if (unlikely(ret < 0)) {
650 macsec_txsa_put(tx_sa);
651 kfree_skb(skb);
652 return ERR_PTR(ret);
653 }
654
655 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
656 if (!req) {
657 macsec_txsa_put(tx_sa);
658 kfree_skb(skb);
659 return ERR_PTR(-ENOMEM);
660 }
661
662 if (secy->xpn)
663 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt);
664 else
665 macsec_fill_iv(iv, secy->sci, pn.lower);
666
667 sg_init_table(sg, ret);
668 ret = skb_to_sgvec(skb, sg, 0, skb->len);
669 if (unlikely(ret < 0)) {
670 aead_request_free(req);
671 macsec_txsa_put(tx_sa);
672 kfree_skb(skb);
673 return ERR_PTR(ret);
674 }
675
676 if (tx_sc->encrypt) {
677 int len = skb->len - macsec_hdr_len(sci_present) -
678 secy->icv_len;
679 aead_request_set_crypt(req, sg, sg, len, iv);
680 aead_request_set_ad(req, macsec_hdr_len(sci_present));
681 } else {
682 aead_request_set_crypt(req, sg, sg, 0, iv);
683 aead_request_set_ad(req, skb->len - secy->icv_len);
684 }
685
686 macsec_skb_cb(skb)->req = req;
687 macsec_skb_cb(skb)->tx_sa = tx_sa;
688 macsec_skb_cb(skb)->has_sci = sci_present;
689 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
690
691 dev_hold(skb->dev);
692 ret = crypto_aead_encrypt(req);
693 if (ret == -EINPROGRESS) {
694 return ERR_PTR(ret);
695 } else if (ret != 0) {
696 dev_put(skb->dev);
697 kfree_skb(skb);
698 aead_request_free(req);
699 macsec_txsa_put(tx_sa);
700 return ERR_PTR(-EINVAL);
701 }
702
703 dev_put(skb->dev);
704 aead_request_free(req);
705 macsec_txsa_put(tx_sa);
706
707 return skb;
708 }
709
710 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
711 {
712 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
713 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
714 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
715 u32 lowest_pn = 0;
716
717 spin_lock(&rx_sa->lock);
718 if (rx_sa->next_pn_halves.lower >= secy->replay_window)
719 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
720
721 /* Now perform replay protection check again
722 * (see IEEE 802.1AE-2006 figure 10-5)
723 */
724 if (secy->replay_protect && pn < lowest_pn &&
725 (!secy->xpn || pn_same_half(pn, lowest_pn))) {
726 spin_unlock(&rx_sa->lock);
727 u64_stats_update_begin(&rxsc_stats->syncp);
728 rxsc_stats->stats.InPktsLate++;
729 u64_stats_update_end(&rxsc_stats->syncp);
730 DEV_STATS_INC(secy->netdev, rx_dropped);
731 return false;
732 }
733
734 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
735 unsigned int msdu_len = macsec_msdu_len(skb);
736 u64_stats_update_begin(&rxsc_stats->syncp);
737 if (hdr->tci_an & MACSEC_TCI_E)
738 rxsc_stats->stats.InOctetsDecrypted += msdu_len;
739 else
740 rxsc_stats->stats.InOctetsValidated += msdu_len;
741 u64_stats_update_end(&rxsc_stats->syncp);
742 }
743
744 if (!macsec_skb_cb(skb)->valid) {
745 spin_unlock(&rx_sa->lock);
746
747 /* 10.6.5 */
748 if (hdr->tci_an & MACSEC_TCI_C ||
749 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
750 u64_stats_update_begin(&rxsc_stats->syncp);
751 rxsc_stats->stats.InPktsNotValid++;
752 u64_stats_update_end(&rxsc_stats->syncp);
753 this_cpu_inc(rx_sa->stats->InPktsNotValid);
754 DEV_STATS_INC(secy->netdev, rx_errors);
755 return false;
756 }
757
758 u64_stats_update_begin(&rxsc_stats->syncp);
759 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
760 rxsc_stats->stats.InPktsInvalid++;
761 this_cpu_inc(rx_sa->stats->InPktsInvalid);
762 } else if (pn < lowest_pn) {
763 rxsc_stats->stats.InPktsDelayed++;
764 } else {
765 rxsc_stats->stats.InPktsUnchecked++;
766 }
767 u64_stats_update_end(&rxsc_stats->syncp);
768 } else {
769 u64_stats_update_begin(&rxsc_stats->syncp);
770 if (pn < lowest_pn) {
771 rxsc_stats->stats.InPktsDelayed++;
772 } else {
773 rxsc_stats->stats.InPktsOK++;
774 this_cpu_inc(rx_sa->stats->InPktsOK);
775 }
776 u64_stats_update_end(&rxsc_stats->syncp);
777
778 // Instead of "pn >=" - to support pn overflow in xpn
779 if (pn + 1 > rx_sa->next_pn_halves.lower) {
780 rx_sa->next_pn_halves.lower = pn + 1;
781 } else if (secy->xpn &&
782 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
783 rx_sa->next_pn_halves.upper++;
784 rx_sa->next_pn_halves.lower = pn + 1;
785 }
786
787 spin_unlock(&rx_sa->lock);
788 }
789
790 return true;
791 }
792
793 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
794 {
795 skb->pkt_type = PACKET_HOST;
796 skb->protocol = eth_type_trans(skb, dev);
797
798 skb_reset_network_header(skb);
799 if (!skb_transport_header_was_set(skb))
800 skb_reset_transport_header(skb);
801 skb_reset_mac_len(skb);
802 }
803
804 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
805 {
806 skb->ip_summed = CHECKSUM_NONE;
807 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
808 skb_pull(skb, hdr_len);
809 pskb_trim_unique(skb, skb->len - icv_len);
810 }
811
812 static void count_rx(struct net_device *dev, int len)
813 {
814 dev_sw_netstats_rx_add(dev, len);
815 }
816
817 static void macsec_decrypt_done(void *data, int err)
818 {
819 struct sk_buff *skb = data;
820 struct net_device *dev = skb->dev;
821 struct macsec_dev *macsec = macsec_priv(dev);
822 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
823 struct macsec_rx_sc *rx_sc = rx_sa->sc;
824 int len;
825 u32 pn;
826
827 aead_request_free(macsec_skb_cb(skb)->req);
828
829 if (!err)
830 macsec_skb_cb(skb)->valid = true;
831
832 rcu_read_lock_bh();
833 pn = ntohl(macsec_ethhdr(skb)->packet_number);
834 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
835 rcu_read_unlock_bh();
836 kfree_skb(skb);
837 goto out;
838 }
839
840 macsec_finalize_skb(skb, macsec->secy.icv_len,
841 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
842 len = skb->len;
843 macsec_reset_skb(skb, macsec->secy.netdev);
844
845 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
846 count_rx(dev, len);
847
848 rcu_read_unlock_bh();
849
850 out:
851 macsec_rxsa_put(rx_sa);
852 macsec_rxsc_put(rx_sc);
853 dev_put(dev);
854 }
855
856 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
857 struct net_device *dev,
858 struct macsec_rx_sa *rx_sa,
859 sci_t sci,
860 struct macsec_secy *secy)
861 {
862 int ret;
863 struct scatterlist *sg;
864 struct sk_buff *trailer;
865 unsigned char *iv;
866 struct aead_request *req;
867 struct macsec_eth_header *hdr;
868 u32 hdr_pn;
869 u16 icv_len = secy->icv_len;
870
871 macsec_skb_cb(skb)->valid = false;
872 skb = skb_share_check(skb, GFP_ATOMIC);
873 if (!skb)
874 return ERR_PTR(-ENOMEM);
875
876 ret = skb_cow_data(skb, 0, &trailer);
877 if (unlikely(ret < 0)) {
878 kfree_skb(skb);
879 return ERR_PTR(ret);
880 }
881 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
882 if (!req) {
883 kfree_skb(skb);
884 return ERR_PTR(-ENOMEM);
885 }
886
887 hdr = (struct macsec_eth_header *)skb->data;
888 hdr_pn = ntohl(hdr->packet_number);
889
890 if (secy->xpn) {
891 pn_t recovered_pn = rx_sa->next_pn_halves;
892
893 recovered_pn.lower = hdr_pn;
894 if (hdr_pn < rx_sa->next_pn_halves.lower &&
895 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
896 recovered_pn.upper++;
897
898 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
899 rx_sa->key.salt);
900 } else {
901 macsec_fill_iv(iv, sci, hdr_pn);
902 }
903
904 sg_init_table(sg, ret);
905 ret = skb_to_sgvec(skb, sg, 0, skb->len);
906 if (unlikely(ret < 0)) {
907 aead_request_free(req);
908 kfree_skb(skb);
909 return ERR_PTR(ret);
910 }
911
912 if (hdr->tci_an & MACSEC_TCI_E) {
913 /* confidentiality: ethernet + macsec header
914 * authenticated, encrypted payload
915 */
916 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
917
918 aead_request_set_crypt(req, sg, sg, len, iv);
919 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
920 skb = skb_unshare(skb, GFP_ATOMIC);
921 if (!skb) {
922 aead_request_free(req);
923 return ERR_PTR(-ENOMEM);
924 }
925 } else {
926 /* integrity only: all headers + data authenticated */
927 aead_request_set_crypt(req, sg, sg, icv_len, iv);
928 aead_request_set_ad(req, skb->len - icv_len);
929 }
930
931 macsec_skb_cb(skb)->req = req;
932 skb->dev = dev;
933 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
934
935 dev_hold(dev);
936 ret = crypto_aead_decrypt(req);
937 if (ret == -EINPROGRESS) {
938 return ERR_PTR(ret);
939 } else if (ret != 0) {
940 /* decryption/authentication failed
941 * 10.6 if validateFrames is disabled, deliver anyway
942 */
943 if (ret != -EBADMSG) {
944 kfree_skb(skb);
945 skb = ERR_PTR(ret);
946 }
947 } else {
948 macsec_skb_cb(skb)->valid = true;
949 }
950 dev_put(dev);
951
952 aead_request_free(req);
953
954 return skb;
955 }
956
957 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
958 {
959 struct macsec_rx_sc *rx_sc;
960
961 for_each_rxsc(secy, rx_sc) {
962 if (rx_sc->sci == sci)
963 return rx_sc;
964 }
965
966 return NULL;
967 }
968
969 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
970 {
971 struct macsec_rx_sc *rx_sc;
972
973 for_each_rxsc_rtnl(secy, rx_sc) {
974 if (rx_sc->sci == sci)
975 return rx_sc;
976 }
977
978 return NULL;
979 }
980
981 static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
982 {
983 /* Deliver to the uncontrolled port by default */
984 enum rx_handler_result ret = RX_HANDLER_PASS;
985 struct ethhdr *hdr = eth_hdr(skb);
986 struct metadata_dst *md_dst;
987 struct macsec_rxh_data *rxd;
988 struct macsec_dev *macsec;
989 bool is_macsec_md_dst;
990
991 rcu_read_lock();
992 rxd = macsec_data_rcu(skb->dev);
993 md_dst = skb_metadata_dst(skb);
994 is_macsec_md_dst = md_dst && md_dst->type == METADATA_MACSEC;
995
996 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
997 struct sk_buff *nskb;
998 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
999 struct net_device *ndev = macsec->secy.netdev;
1000
1001 /* If h/w offloading is enabled, HW decodes frames and strips
1002 * the SecTAG, so we have to deduce which port to deliver to.
1003 */
1004 if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
1005 const struct macsec_ops *ops;
1006
1007 ops = macsec_get_ops(macsec, NULL);
1008
1009 if (ops->rx_uses_md_dst && !is_macsec_md_dst)
1010 continue;
1011
1012 if (is_macsec_md_dst) {
1013 struct macsec_rx_sc *rx_sc;
1014
1015 /* All drivers that implement MACsec offload
1016 * support using skb metadata destinations must
1017 * indicate that they do so.
1018 */
1019 DEBUG_NET_WARN_ON_ONCE(!ops->rx_uses_md_dst);
1020 rx_sc = find_rx_sc(&macsec->secy,
1021 md_dst->u.macsec_info.sci);
1022 if (!rx_sc)
1023 continue;
1024 /* device indicated macsec offload occurred */
1025 skb->dev = ndev;
1026 skb->pkt_type = PACKET_HOST;
1027 eth_skb_pkt_type(skb, ndev);
1028 ret = RX_HANDLER_ANOTHER;
1029 goto out;
1030 }
1031
1032 /* This datapath is insecure because it is unable to
1033 * enforce isolation of broadcast/multicast traffic and
1034 * unicast traffic with promiscuous mode on the macsec
1035 * netdev. Since the core stack has no mechanism to
1036 * check that the hardware did indeed receive MACsec
1037 * traffic, it is possible that the response handling
1038 * done by the MACsec port was to a plaintext packet.
1039 * This violates the MACsec protocol standard.
1040 */
1041 if (ether_addr_equal_64bits(hdr->h_dest,
1042 ndev->dev_addr)) {
1043 /* exact match, divert skb to this port */
1044 skb->dev = ndev;
1045 skb->pkt_type = PACKET_HOST;
1046 ret = RX_HANDLER_ANOTHER;
1047 goto out;
1048 } else if (is_multicast_ether_addr_64bits(
1049 hdr->h_dest)) {
1050 /* multicast frame, deliver on this port too */
1051 nskb = skb_clone(skb, GFP_ATOMIC);
1052 if (!nskb)
1053 break;
1054
1055 nskb->dev = ndev;
1056 eth_skb_pkt_type(nskb, ndev);
1057
1058 __netif_rx(nskb);
1059 } else if (ndev->flags & IFF_PROMISC) {
1060 skb->dev = ndev;
1061 skb->pkt_type = PACKET_HOST;
1062 ret = RX_HANDLER_ANOTHER;
1063 goto out;
1064 }
1065
1066 continue;
1067 }
1068
1069 /* 10.6 If the management control validateFrames is not
1070 * Strict, frames without a SecTAG are received, counted, and
1071 * delivered to the Controlled Port
1072 */
1073 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1074 u64_stats_update_begin(&secy_stats->syncp);
1075 secy_stats->stats.InPktsNoTag++;
1076 u64_stats_update_end(&secy_stats->syncp);
1077 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1078 continue;
1079 }
1080
1081 /* deliver on this port */
1082 nskb = skb_clone(skb, GFP_ATOMIC);
1083 if (!nskb)
1084 break;
1085
1086 nskb->dev = ndev;
1087
1088 if (__netif_rx(nskb) == NET_RX_SUCCESS) {
1089 u64_stats_update_begin(&secy_stats->syncp);
1090 secy_stats->stats.InPktsUntagged++;
1091 u64_stats_update_end(&secy_stats->syncp);
1092 }
1093 }
1094
1095 out:
1096 rcu_read_unlock();
1097 return ret;
1098 }
1099
1100 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1101 {
1102 struct sk_buff *skb = *pskb;
1103 struct net_device *dev = skb->dev;
1104 struct macsec_eth_header *hdr;
1105 struct macsec_secy *secy = NULL;
1106 struct macsec_rx_sc *rx_sc;
1107 struct macsec_rx_sa *rx_sa;
1108 struct macsec_rxh_data *rxd;
1109 struct macsec_dev *macsec;
1110 unsigned int len;
1111 sci_t sci;
1112 u32 hdr_pn;
1113 bool cbit;
1114 struct pcpu_rx_sc_stats *rxsc_stats;
1115 struct pcpu_secy_stats *secy_stats;
1116 bool pulled_sci;
1117 int ret;
1118
1119 if (skb_headroom(skb) < ETH_HLEN)
1120 goto drop_direct;
1121
1122 hdr = macsec_ethhdr(skb);
1123 if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
1124 return handle_not_macsec(skb);
1125
1126 skb = skb_unshare(skb, GFP_ATOMIC);
1127 *pskb = skb;
1128 if (!skb)
1129 return RX_HANDLER_CONSUMED;
1130
1131 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1132 if (!pulled_sci) {
1133 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1134 goto drop_direct;
1135 }
1136
1137 hdr = macsec_ethhdr(skb);
1138
1139 /* Frames with a SecTAG that has the TCI E bit set but the C
1140 * bit clear are discarded, as this reserved encoding is used
1141 * to identify frames with a SecTAG that are not to be
1142 * delivered to the Controlled Port.
1143 */
1144 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1145 return RX_HANDLER_PASS;
1146
1147 /* now, pull the extra length */
1148 if (hdr->tci_an & MACSEC_TCI_SC) {
1149 if (!pulled_sci)
1150 goto drop_direct;
1151 }
1152
1153 /* ethernet header is part of crypto processing */
1154 skb_push(skb, ETH_HLEN);
1155
1156 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1157 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1158 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1159
1160 rcu_read_lock();
1161 rxd = macsec_data_rcu(skb->dev);
1162
1163 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1164 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1165
1166 sc = sc ? macsec_rxsc_get(sc) : NULL;
1167
1168 if (sc) {
1169 secy = &macsec->secy;
1170 rx_sc = sc;
1171 break;
1172 }
1173 }
1174
1175 if (!secy)
1176 goto nosci;
1177
1178 dev = secy->netdev;
1179 macsec = macsec_priv(dev);
1180 secy_stats = this_cpu_ptr(macsec->stats);
1181 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1182
1183 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
1184 u64_stats_update_begin(&secy_stats->syncp);
1185 secy_stats->stats.InPktsBadTag++;
1186 u64_stats_update_end(&secy_stats->syncp);
1187 DEV_STATS_INC(secy->netdev, rx_errors);
1188 goto drop_nosa;
1189 }
1190
1191 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1192 if (!rx_sa) {
1193 /* 10.6.1 if the SA is not in use */
1194
1195 /* If validateFrames is Strict or the C bit in the
1196 * SecTAG is set, discard
1197 */
1198 if (hdr->tci_an & MACSEC_TCI_C ||
1199 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1200 u64_stats_update_begin(&rxsc_stats->syncp);
1201 rxsc_stats->stats.InPktsNotUsingSA++;
1202 u64_stats_update_end(&rxsc_stats->syncp);
1203 DEV_STATS_INC(secy->netdev, rx_errors);
1204 goto drop_nosa;
1205 }
1206
1207 /* not Strict, the frame (with the SecTAG and ICV
1208 * removed) is delivered to the Controlled Port.
1209 */
1210 u64_stats_update_begin(&rxsc_stats->syncp);
1211 rxsc_stats->stats.InPktsUnusedSA++;
1212 u64_stats_update_end(&rxsc_stats->syncp);
1213 goto deliver;
1214 }
1215
1216 /* First, PN check to avoid decrypting obviously wrong packets */
1217 hdr_pn = ntohl(hdr->packet_number);
1218 if (secy->replay_protect) {
1219 bool late;
1220
1221 spin_lock(&rx_sa->lock);
1222 late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
1223 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
1224
1225 if (secy->xpn)
1226 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
1227 spin_unlock(&rx_sa->lock);
1228
1229 if (late) {
1230 u64_stats_update_begin(&rxsc_stats->syncp);
1231 rxsc_stats->stats.InPktsLate++;
1232 u64_stats_update_end(&rxsc_stats->syncp);
1233 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1234 goto drop;
1235 }
1236 }
1237
1238 macsec_skb_cb(skb)->rx_sa = rx_sa;
1239
1240 /* Disabled && !changed text => skip validation */
1241 if (hdr->tci_an & MACSEC_TCI_C ||
1242 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1243 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1244
1245 if (IS_ERR(skb)) {
1246 /* the decrypt callback needs the reference */
1247 if (PTR_ERR(skb) != -EINPROGRESS) {
1248 macsec_rxsa_put(rx_sa);
1249 macsec_rxsc_put(rx_sc);
1250 }
1251 rcu_read_unlock();
1252 *pskb = NULL;
1253 return RX_HANDLER_CONSUMED;
1254 }
1255
1256 if (!macsec_post_decrypt(skb, secy, hdr_pn))
1257 goto drop;
1258
1259 deliver:
1260 macsec_finalize_skb(skb, secy->icv_len,
1261 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1262 len = skb->len;
1263 macsec_reset_skb(skb, secy->netdev);
1264
1265 if (rx_sa)
1266 macsec_rxsa_put(rx_sa);
1267 macsec_rxsc_put(rx_sc);
1268
1269 skb_orphan(skb);
1270 ret = gro_cells_receive(&macsec->gro_cells, skb);
1271 if (ret == NET_RX_SUCCESS)
1272 count_rx(dev, len);
1273 else
1274 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1275
1276 rcu_read_unlock();
1277
1278 *pskb = NULL;
1279 return RX_HANDLER_CONSUMED;
1280
1281 drop:
1282 macsec_rxsa_put(rx_sa);
1283 drop_nosa:
1284 macsec_rxsc_put(rx_sc);
1285 rcu_read_unlock();
1286 drop_direct:
1287 kfree_skb(skb);
1288 *pskb = NULL;
1289 return RX_HANDLER_CONSUMED;
1290
1291 nosci:
1292 /* 10.6.1 if the SC is not found */
1293 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1294 if (!cbit)
1295 macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN,
1296 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1297
1298 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1299 struct sk_buff *nskb;
1300
1301 secy_stats = this_cpu_ptr(macsec->stats);
1302
1303 /* If validateFrames is Strict or the C bit in the
1304 * SecTAG is set, discard
1305 */
1306 if (cbit ||
1307 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1308 u64_stats_update_begin(&secy_stats->syncp);
1309 secy_stats->stats.InPktsNoSCI++;
1310 u64_stats_update_end(&secy_stats->syncp);
1311 DEV_STATS_INC(macsec->secy.netdev, rx_errors);
1312 continue;
1313 }
1314
1315 /* not strict, the frame (with the SecTAG and ICV
1316 * removed) is delivered to the Controlled Port.
1317 */
1318 nskb = skb_clone(skb, GFP_ATOMIC);
1319 if (!nskb)
1320 break;
1321
1322 macsec_reset_skb(nskb, macsec->secy.netdev);
1323
1324 ret = __netif_rx(nskb);
1325 if (ret == NET_RX_SUCCESS) {
1326 u64_stats_update_begin(&secy_stats->syncp);
1327 secy_stats->stats.InPktsUnknownSCI++;
1328 u64_stats_update_end(&secy_stats->syncp);
1329 } else {
1330 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1331 }
1332 }
1333
1334 rcu_read_unlock();
1335 *pskb = skb;
1336 return RX_HANDLER_PASS;
1337 }
1338
1339 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1340 {
1341 struct crypto_aead *tfm;
1342 int ret;
1343
1344 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1345
1346 if (IS_ERR(tfm))
1347 return tfm;
1348
1349 ret = crypto_aead_setkey(tfm, key, key_len);
1350 if (ret < 0)
1351 goto fail;
1352
1353 ret = crypto_aead_setauthsize(tfm, icv_len);
1354 if (ret < 0)
1355 goto fail;
1356
1357 return tfm;
1358 fail:
1359 crypto_free_aead(tfm);
1360 return ERR_PTR(ret);
1361 }
1362
1363 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1364 int icv_len)
1365 {
1366 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1367 if (!rx_sa->stats)
1368 return -ENOMEM;
1369
1370 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1371 if (IS_ERR(rx_sa->key.tfm)) {
1372 free_percpu(rx_sa->stats);
1373 return PTR_ERR(rx_sa->key.tfm);
1374 }
1375
1376 rx_sa->ssci = MACSEC_UNDEF_SSCI;
1377 rx_sa->active = false;
1378 rx_sa->next_pn = 1;
1379 refcount_set(&rx_sa->refcnt, 1);
1380 spin_lock_init(&rx_sa->lock);
1381
1382 return 0;
1383 }
1384
1385 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1386 {
1387 rx_sa->active = false;
1388
1389 macsec_rxsa_put(rx_sa);
1390 }
1391
1392 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1393 {
1394 int i;
1395
1396 for (i = 0; i < MACSEC_NUM_AN; i++) {
1397 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1398
1399 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1400 if (sa)
1401 clear_rx_sa(sa);
1402 }
1403
1404 macsec_rxsc_put(rx_sc);
1405 }
1406
1407 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1408 {
1409 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1410
1411 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1412 rx_sc;
1413 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1414 if (rx_sc->sci == sci) {
1415 if (rx_sc->active)
1416 secy->n_rx_sc--;
1417 rcu_assign_pointer(*rx_scp, rx_sc->next);
1418 return rx_sc;
1419 }
1420 }
1421
1422 return NULL;
1423 }
1424
1425 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci,
1426 bool active)
1427 {
1428 struct macsec_rx_sc *rx_sc;
1429 struct macsec_dev *macsec;
1430 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1431 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1432 struct macsec_secy *secy;
1433
1434 list_for_each_entry(macsec, &rxd->secys, secys) {
1435 if (find_rx_sc_rtnl(&macsec->secy, sci))
1436 return ERR_PTR(-EEXIST);
1437 }
1438
1439 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1440 if (!rx_sc)
1441 return ERR_PTR(-ENOMEM);
1442
1443 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1444 if (!rx_sc->stats) {
1445 kfree(rx_sc);
1446 return ERR_PTR(-ENOMEM);
1447 }
1448
1449 rx_sc->sci = sci;
1450 rx_sc->active = active;
1451 refcount_set(&rx_sc->refcnt, 1);
1452
1453 secy = &macsec_priv(dev)->secy;
1454 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1455 rcu_assign_pointer(secy->rx_sc, rx_sc);
1456
1457 if (rx_sc->active)
1458 secy->n_rx_sc++;
1459
1460 return rx_sc;
1461 }
1462
1463 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1464 int icv_len)
1465 {
1466 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1467 if (!tx_sa->stats)
1468 return -ENOMEM;
1469
1470 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1471 if (IS_ERR(tx_sa->key.tfm)) {
1472 free_percpu(tx_sa->stats);
1473 return PTR_ERR(tx_sa->key.tfm);
1474 }
1475
1476 tx_sa->ssci = MACSEC_UNDEF_SSCI;
1477 tx_sa->active = false;
1478 refcount_set(&tx_sa->refcnt, 1);
1479 spin_lock_init(&tx_sa->lock);
1480
1481 return 0;
1482 }
1483
1484 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1485 {
1486 tx_sa->active = false;
1487
1488 macsec_txsa_put(tx_sa);
1489 }
1490
1491 static struct genl_family macsec_fam;
1492
1493 static struct net_device *get_dev_from_nl(struct net *net,
1494 struct nlattr **attrs)
1495 {
1496 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1497 struct net_device *dev;
1498
1499 dev = __dev_get_by_index(net, ifindex);
1500 if (!dev)
1501 return ERR_PTR(-ENODEV);
1502
1503 if (!netif_is_macsec(dev))
1504 return ERR_PTR(-ENODEV);
1505
1506 return dev;
1507 }
1508
1509 static enum macsec_offload nla_get_offload(const struct nlattr *nla)
1510 {
1511 return (__force enum macsec_offload)nla_get_u8(nla);
1512 }
1513
1514 static sci_t nla_get_sci(const struct nlattr *nla)
1515 {
1516 return (__force sci_t)nla_get_u64(nla);
1517 }
1518
1519 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1520 int padattr)
1521 {
1522 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1523 }
1524
1525 static ssci_t nla_get_ssci(const struct nlattr *nla)
1526 {
1527 return (__force ssci_t)nla_get_u32(nla);
1528 }
1529
1530 static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
1531 {
1532 return nla_put_u32(skb, attrtype, (__force u64)value);
1533 }
1534
1535 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1536 struct nlattr **attrs,
1537 struct nlattr **tb_sa,
1538 struct net_device **devp,
1539 struct macsec_secy **secyp,
1540 struct macsec_tx_sc **scp,
1541 u8 *assoc_num)
1542 {
1543 struct net_device *dev;
1544 struct macsec_secy *secy;
1545 struct macsec_tx_sc *tx_sc;
1546 struct macsec_tx_sa *tx_sa;
1547
1548 if (!tb_sa[MACSEC_SA_ATTR_AN])
1549 return ERR_PTR(-EINVAL);
1550
1551 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1552
1553 dev = get_dev_from_nl(net, attrs);
1554 if (IS_ERR(dev))
1555 return ERR_CAST(dev);
1556
1557 if (*assoc_num >= MACSEC_NUM_AN)
1558 return ERR_PTR(-EINVAL);
1559
1560 secy = &macsec_priv(dev)->secy;
1561 tx_sc = &secy->tx_sc;
1562
1563 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1564 if (!tx_sa)
1565 return ERR_PTR(-ENODEV);
1566
1567 *devp = dev;
1568 *scp = tx_sc;
1569 *secyp = secy;
1570 return tx_sa;
1571 }
1572
1573 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1574 struct nlattr **attrs,
1575 struct nlattr **tb_rxsc,
1576 struct net_device **devp,
1577 struct macsec_secy **secyp)
1578 {
1579 struct net_device *dev;
1580 struct macsec_secy *secy;
1581 struct macsec_rx_sc *rx_sc;
1582 sci_t sci;
1583
1584 dev = get_dev_from_nl(net, attrs);
1585 if (IS_ERR(dev))
1586 return ERR_CAST(dev);
1587
1588 secy = &macsec_priv(dev)->secy;
1589
1590 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1591 return ERR_PTR(-EINVAL);
1592
1593 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1594 rx_sc = find_rx_sc_rtnl(secy, sci);
1595 if (!rx_sc)
1596 return ERR_PTR(-ENODEV);
1597
1598 *secyp = secy;
1599 *devp = dev;
1600
1601 return rx_sc;
1602 }
1603
1604 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1605 struct nlattr **attrs,
1606 struct nlattr **tb_rxsc,
1607 struct nlattr **tb_sa,
1608 struct net_device **devp,
1609 struct macsec_secy **secyp,
1610 struct macsec_rx_sc **scp,
1611 u8 *assoc_num)
1612 {
1613 struct macsec_rx_sc *rx_sc;
1614 struct macsec_rx_sa *rx_sa;
1615
1616 if (!tb_sa[MACSEC_SA_ATTR_AN])
1617 return ERR_PTR(-EINVAL);
1618
1619 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1620 if (*assoc_num >= MACSEC_NUM_AN)
1621 return ERR_PTR(-EINVAL);
1622
1623 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1624 if (IS_ERR(rx_sc))
1625 return ERR_CAST(rx_sc);
1626
1627 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1628 if (!rx_sa)
1629 return ERR_PTR(-ENODEV);
1630
1631 *scp = rx_sc;
1632 return rx_sa;
1633 }
1634
1635 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1636 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1637 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1638 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1639 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1640 };
1641
1642 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1643 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1644 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1645 };
1646
1647 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1648 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1649 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1650 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4),
1651 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1652 .len = MACSEC_KEYID_LEN, },
1653 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1654 .len = MACSEC_MAX_KEY_LEN, },
1655 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
1656 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
1657 .len = MACSEC_SALT_LEN, },
1658 };
1659
1660 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
1661 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
1662 };
1663
1664 /* Offloads an operation to a device driver */
1665 static int macsec_offload(int (* const func)(struct macsec_context *),
1666 struct macsec_context *ctx)
1667 {
1668 int ret;
1669
1670 if (unlikely(!func))
1671 return 0;
1672
1673 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1674 mutex_lock(&ctx->phydev->lock);
1675
1676 ret = (*func)(ctx);
1677
1678 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1679 mutex_unlock(&ctx->phydev->lock);
1680
1681 return ret;
1682 }
1683
1684 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1685 {
1686 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1687 return -EINVAL;
1688
1689 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1690 return -EINVAL;
1691
1692 return 0;
1693 }
1694
1695 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1696 {
1697 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1698 return -EINVAL;
1699
1700 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1701 return -EINVAL;
1702
1703 return 0;
1704 }
1705
1706 static bool validate_add_rxsa(struct nlattr **attrs)
1707 {
1708 if (!attrs[MACSEC_SA_ATTR_AN] ||
1709 !attrs[MACSEC_SA_ATTR_KEY] ||
1710 !attrs[MACSEC_SA_ATTR_KEYID])
1711 return false;
1712
1713 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1714 return false;
1715
1716 if (attrs[MACSEC_SA_ATTR_PN] &&
1717 nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1718 return false;
1719
1720 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1721 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1722 return false;
1723 }
1724
1725 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1726 return false;
1727
1728 return true;
1729 }
1730
1731 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1732 {
1733 struct net_device *dev;
1734 struct nlattr **attrs = info->attrs;
1735 struct macsec_secy *secy;
1736 struct macsec_rx_sc *rx_sc;
1737 struct macsec_rx_sa *rx_sa;
1738 unsigned char assoc_num;
1739 int pn_len;
1740 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1741 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1742 int err;
1743
1744 if (!attrs[MACSEC_ATTR_IFINDEX])
1745 return -EINVAL;
1746
1747 if (parse_sa_config(attrs, tb_sa))
1748 return -EINVAL;
1749
1750 if (parse_rxsc_config(attrs, tb_rxsc))
1751 return -EINVAL;
1752
1753 if (!validate_add_rxsa(tb_sa))
1754 return -EINVAL;
1755
1756 rtnl_lock();
1757 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1758 if (IS_ERR(rx_sc)) {
1759 rtnl_unlock();
1760 return PTR_ERR(rx_sc);
1761 }
1762
1763 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1764
1765 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1766 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1767 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1768 rtnl_unlock();
1769 return -EINVAL;
1770 }
1771
1772 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1773 if (tb_sa[MACSEC_SA_ATTR_PN] &&
1774 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1775 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
1776 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1777 rtnl_unlock();
1778 return -EINVAL;
1779 }
1780
1781 if (secy->xpn) {
1782 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
1783 rtnl_unlock();
1784 return -EINVAL;
1785 }
1786
1787 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
1788 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
1789 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
1790 MACSEC_SALT_LEN);
1791 rtnl_unlock();
1792 return -EINVAL;
1793 }
1794 }
1795
1796 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1797 if (rx_sa) {
1798 rtnl_unlock();
1799 return -EBUSY;
1800 }
1801
1802 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1803 if (!rx_sa) {
1804 rtnl_unlock();
1805 return -ENOMEM;
1806 }
1807
1808 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1809 secy->key_len, secy->icv_len);
1810 if (err < 0) {
1811 kfree(rx_sa);
1812 rtnl_unlock();
1813 return err;
1814 }
1815
1816 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1817 spin_lock_bh(&rx_sa->lock);
1818 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
1819 spin_unlock_bh(&rx_sa->lock);
1820 }
1821
1822 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1823 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1824
1825 rx_sa->sc = rx_sc;
1826
1827 if (secy->xpn) {
1828 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
1829 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
1830 MACSEC_SALT_LEN);
1831 }
1832
1833 /* If h/w offloading is available, propagate to the device */
1834 if (macsec_is_offloaded(netdev_priv(dev))) {
1835 const struct macsec_ops *ops;
1836 struct macsec_context ctx;
1837
1838 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1839 if (!ops) {
1840 err = -EOPNOTSUPP;
1841 goto cleanup;
1842 }
1843
1844 ctx.sa.assoc_num = assoc_num;
1845 ctx.sa.rx_sa = rx_sa;
1846 ctx.secy = secy;
1847 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1848 secy->key_len);
1849
1850 err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1851 memzero_explicit(ctx.sa.key, secy->key_len);
1852 if (err)
1853 goto cleanup;
1854 }
1855
1856 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1857 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1858
1859 rtnl_unlock();
1860
1861 return 0;
1862
1863 cleanup:
1864 macsec_rxsa_put(rx_sa);
1865 rtnl_unlock();
1866 return err;
1867 }
1868
1869 static bool validate_add_rxsc(struct nlattr **attrs)
1870 {
1871 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1872 return false;
1873
1874 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1875 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1876 return false;
1877 }
1878
1879 return true;
1880 }
1881
1882 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1883 {
1884 struct net_device *dev;
1885 sci_t sci = MACSEC_UNDEF_SCI;
1886 struct nlattr **attrs = info->attrs;
1887 struct macsec_rx_sc *rx_sc;
1888 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1889 struct macsec_secy *secy;
1890 bool active = true;
1891 int ret;
1892
1893 if (!attrs[MACSEC_ATTR_IFINDEX])
1894 return -EINVAL;
1895
1896 if (parse_rxsc_config(attrs, tb_rxsc))
1897 return -EINVAL;
1898
1899 if (!validate_add_rxsc(tb_rxsc))
1900 return -EINVAL;
1901
1902 rtnl_lock();
1903 dev = get_dev_from_nl(genl_info_net(info), attrs);
1904 if (IS_ERR(dev)) {
1905 rtnl_unlock();
1906 return PTR_ERR(dev);
1907 }
1908
1909 secy = &macsec_priv(dev)->secy;
1910 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1911
1912 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1913 active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1914
1915 rx_sc = create_rx_sc(dev, sci, active);
1916 if (IS_ERR(rx_sc)) {
1917 rtnl_unlock();
1918 return PTR_ERR(rx_sc);
1919 }
1920
1921 if (macsec_is_offloaded(netdev_priv(dev))) {
1922 const struct macsec_ops *ops;
1923 struct macsec_context ctx;
1924
1925 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1926 if (!ops) {
1927 ret = -EOPNOTSUPP;
1928 goto cleanup;
1929 }
1930
1931 ctx.rx_sc = rx_sc;
1932 ctx.secy = secy;
1933
1934 ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1935 if (ret)
1936 goto cleanup;
1937 }
1938
1939 rtnl_unlock();
1940
1941 return 0;
1942
1943 cleanup:
1944 del_rx_sc(secy, sci);
1945 free_rx_sc(rx_sc);
1946 rtnl_unlock();
1947 return ret;
1948 }
1949
1950 static bool validate_add_txsa(struct nlattr **attrs)
1951 {
1952 if (!attrs[MACSEC_SA_ATTR_AN] ||
1953 !attrs[MACSEC_SA_ATTR_PN] ||
1954 !attrs[MACSEC_SA_ATTR_KEY] ||
1955 !attrs[MACSEC_SA_ATTR_KEYID])
1956 return false;
1957
1958 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1959 return false;
1960
1961 if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1962 return false;
1963
1964 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1965 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1966 return false;
1967 }
1968
1969 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1970 return false;
1971
1972 return true;
1973 }
1974
1975 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1976 {
1977 struct net_device *dev;
1978 struct nlattr **attrs = info->attrs;
1979 struct macsec_secy *secy;
1980 struct macsec_tx_sc *tx_sc;
1981 struct macsec_tx_sa *tx_sa;
1982 unsigned char assoc_num;
1983 int pn_len;
1984 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1985 bool was_operational;
1986 int err;
1987
1988 if (!attrs[MACSEC_ATTR_IFINDEX])
1989 return -EINVAL;
1990
1991 if (parse_sa_config(attrs, tb_sa))
1992 return -EINVAL;
1993
1994 if (!validate_add_txsa(tb_sa))
1995 return -EINVAL;
1996
1997 rtnl_lock();
1998 dev = get_dev_from_nl(genl_info_net(info), attrs);
1999 if (IS_ERR(dev)) {
2000 rtnl_unlock();
2001 return PTR_ERR(dev);
2002 }
2003
2004 secy = &macsec_priv(dev)->secy;
2005 tx_sc = &secy->tx_sc;
2006
2007 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
2008
2009 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
2010 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
2011 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
2012 rtnl_unlock();
2013 return -EINVAL;
2014 }
2015
2016 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2017 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2018 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
2019 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2020 rtnl_unlock();
2021 return -EINVAL;
2022 }
2023
2024 if (secy->xpn) {
2025 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
2026 rtnl_unlock();
2027 return -EINVAL;
2028 }
2029
2030 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
2031 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
2032 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
2033 MACSEC_SALT_LEN);
2034 rtnl_unlock();
2035 return -EINVAL;
2036 }
2037 }
2038
2039 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
2040 if (tx_sa) {
2041 rtnl_unlock();
2042 return -EBUSY;
2043 }
2044
2045 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
2046 if (!tx_sa) {
2047 rtnl_unlock();
2048 return -ENOMEM;
2049 }
2050
2051 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2052 secy->key_len, secy->icv_len);
2053 if (err < 0) {
2054 kfree(tx_sa);
2055 rtnl_unlock();
2056 return err;
2057 }
2058
2059 spin_lock_bh(&tx_sa->lock);
2060 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2061 spin_unlock_bh(&tx_sa->lock);
2062
2063 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2064 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2065
2066 was_operational = secy->operational;
2067 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
2068 secy->operational = true;
2069
2070 if (secy->xpn) {
2071 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
2072 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
2073 MACSEC_SALT_LEN);
2074 }
2075
2076 /* If h/w offloading is available, propagate to the device */
2077 if (macsec_is_offloaded(netdev_priv(dev))) {
2078 const struct macsec_ops *ops;
2079 struct macsec_context ctx;
2080
2081 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2082 if (!ops) {
2083 err = -EOPNOTSUPP;
2084 goto cleanup;
2085 }
2086
2087 ctx.sa.assoc_num = assoc_num;
2088 ctx.sa.tx_sa = tx_sa;
2089 ctx.secy = secy;
2090 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2091 secy->key_len);
2092
2093 err = macsec_offload(ops->mdo_add_txsa, &ctx);
2094 memzero_explicit(ctx.sa.key, secy->key_len);
2095 if (err)
2096 goto cleanup;
2097 }
2098
2099 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
2100 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
2101
2102 rtnl_unlock();
2103
2104 return 0;
2105
2106 cleanup:
2107 secy->operational = was_operational;
2108 macsec_txsa_put(tx_sa);
2109 rtnl_unlock();
2110 return err;
2111 }
2112
2113 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
2114 {
2115 struct nlattr **attrs = info->attrs;
2116 struct net_device *dev;
2117 struct macsec_secy *secy;
2118 struct macsec_rx_sc *rx_sc;
2119 struct macsec_rx_sa *rx_sa;
2120 u8 assoc_num;
2121 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2122 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2123 int ret;
2124
2125 if (!attrs[MACSEC_ATTR_IFINDEX])
2126 return -EINVAL;
2127
2128 if (parse_sa_config(attrs, tb_sa))
2129 return -EINVAL;
2130
2131 if (parse_rxsc_config(attrs, tb_rxsc))
2132 return -EINVAL;
2133
2134 rtnl_lock();
2135 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2136 &dev, &secy, &rx_sc, &assoc_num);
2137 if (IS_ERR(rx_sa)) {
2138 rtnl_unlock();
2139 return PTR_ERR(rx_sa);
2140 }
2141
2142 if (rx_sa->active) {
2143 rtnl_unlock();
2144 return -EBUSY;
2145 }
2146
2147 /* If h/w offloading is available, propagate to the device */
2148 if (macsec_is_offloaded(netdev_priv(dev))) {
2149 const struct macsec_ops *ops;
2150 struct macsec_context ctx;
2151
2152 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2153 if (!ops) {
2154 ret = -EOPNOTSUPP;
2155 goto cleanup;
2156 }
2157
2158 ctx.sa.assoc_num = assoc_num;
2159 ctx.sa.rx_sa = rx_sa;
2160 ctx.secy = secy;
2161
2162 ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
2163 if (ret)
2164 goto cleanup;
2165 }
2166
2167 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
2168 clear_rx_sa(rx_sa);
2169
2170 rtnl_unlock();
2171
2172 return 0;
2173
2174 cleanup:
2175 rtnl_unlock();
2176 return ret;
2177 }
2178
2179 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
2180 {
2181 struct nlattr **attrs = info->attrs;
2182 struct net_device *dev;
2183 struct macsec_secy *secy;
2184 struct macsec_rx_sc *rx_sc;
2185 sci_t sci;
2186 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2187 int ret;
2188
2189 if (!attrs[MACSEC_ATTR_IFINDEX])
2190 return -EINVAL;
2191
2192 if (parse_rxsc_config(attrs, tb_rxsc))
2193 return -EINVAL;
2194
2195 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
2196 return -EINVAL;
2197
2198 rtnl_lock();
2199 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2200 if (IS_ERR(dev)) {
2201 rtnl_unlock();
2202 return PTR_ERR(dev);
2203 }
2204
2205 secy = &macsec_priv(dev)->secy;
2206 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2207
2208 rx_sc = del_rx_sc(secy, sci);
2209 if (!rx_sc) {
2210 rtnl_unlock();
2211 return -ENODEV;
2212 }
2213
2214 /* If h/w offloading is available, propagate to the device */
2215 if (macsec_is_offloaded(netdev_priv(dev))) {
2216 const struct macsec_ops *ops;
2217 struct macsec_context ctx;
2218
2219 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2220 if (!ops) {
2221 ret = -EOPNOTSUPP;
2222 goto cleanup;
2223 }
2224
2225 ctx.rx_sc = rx_sc;
2226 ctx.secy = secy;
2227 ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2228 if (ret)
2229 goto cleanup;
2230 }
2231
2232 free_rx_sc(rx_sc);
2233 rtnl_unlock();
2234
2235 return 0;
2236
2237 cleanup:
2238 rtnl_unlock();
2239 return ret;
2240 }
2241
2242 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2243 {
2244 struct nlattr **attrs = info->attrs;
2245 struct net_device *dev;
2246 struct macsec_secy *secy;
2247 struct macsec_tx_sc *tx_sc;
2248 struct macsec_tx_sa *tx_sa;
2249 u8 assoc_num;
2250 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2251 int ret;
2252
2253 if (!attrs[MACSEC_ATTR_IFINDEX])
2254 return -EINVAL;
2255
2256 if (parse_sa_config(attrs, tb_sa))
2257 return -EINVAL;
2258
2259 rtnl_lock();
2260 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2261 &dev, &secy, &tx_sc, &assoc_num);
2262 if (IS_ERR(tx_sa)) {
2263 rtnl_unlock();
2264 return PTR_ERR(tx_sa);
2265 }
2266
2267 if (tx_sa->active) {
2268 rtnl_unlock();
2269 return -EBUSY;
2270 }
2271
2272 /* If h/w offloading is available, propagate to the device */
2273 if (macsec_is_offloaded(netdev_priv(dev))) {
2274 const struct macsec_ops *ops;
2275 struct macsec_context ctx;
2276
2277 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2278 if (!ops) {
2279 ret = -EOPNOTSUPP;
2280 goto cleanup;
2281 }
2282
2283 ctx.sa.assoc_num = assoc_num;
2284 ctx.sa.tx_sa = tx_sa;
2285 ctx.secy = secy;
2286
2287 ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2288 if (ret)
2289 goto cleanup;
2290 }
2291
2292 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2293 clear_tx_sa(tx_sa);
2294
2295 rtnl_unlock();
2296
2297 return 0;
2298
2299 cleanup:
2300 rtnl_unlock();
2301 return ret;
2302 }
2303
2304 static bool validate_upd_sa(struct nlattr **attrs)
2305 {
2306 if (!attrs[MACSEC_SA_ATTR_AN] ||
2307 attrs[MACSEC_SA_ATTR_KEY] ||
2308 attrs[MACSEC_SA_ATTR_KEYID] ||
2309 attrs[MACSEC_SA_ATTR_SSCI] ||
2310 attrs[MACSEC_SA_ATTR_SALT])
2311 return false;
2312
2313 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2314 return false;
2315
2316 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
2317 return false;
2318
2319 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2320 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2321 return false;
2322 }
2323
2324 return true;
2325 }
2326
2327 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2328 {
2329 struct nlattr **attrs = info->attrs;
2330 struct net_device *dev;
2331 struct macsec_secy *secy;
2332 struct macsec_tx_sc *tx_sc;
2333 struct macsec_tx_sa *tx_sa;
2334 u8 assoc_num;
2335 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2336 bool was_operational, was_active;
2337 pn_t prev_pn;
2338 int ret = 0;
2339
2340 prev_pn.full64 = 0;
2341
2342 if (!attrs[MACSEC_ATTR_IFINDEX])
2343 return -EINVAL;
2344
2345 if (parse_sa_config(attrs, tb_sa))
2346 return -EINVAL;
2347
2348 if (!validate_upd_sa(tb_sa))
2349 return -EINVAL;
2350
2351 rtnl_lock();
2352 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2353 &dev, &secy, &tx_sc, &assoc_num);
2354 if (IS_ERR(tx_sa)) {
2355 rtnl_unlock();
2356 return PTR_ERR(tx_sa);
2357 }
2358
2359 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2360 int pn_len;
2361
2362 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2363 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2364 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
2365 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2366 rtnl_unlock();
2367 return -EINVAL;
2368 }
2369
2370 spin_lock_bh(&tx_sa->lock);
2371 prev_pn = tx_sa->next_pn_halves;
2372 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2373 spin_unlock_bh(&tx_sa->lock);
2374 }
2375
2376 was_active = tx_sa->active;
2377 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2378 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2379
2380 was_operational = secy->operational;
2381 if (assoc_num == tx_sc->encoding_sa)
2382 secy->operational = tx_sa->active;
2383
2384 /* If h/w offloading is available, propagate to the device */
2385 if (macsec_is_offloaded(netdev_priv(dev))) {
2386 const struct macsec_ops *ops;
2387 struct macsec_context ctx;
2388
2389 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2390 if (!ops) {
2391 ret = -EOPNOTSUPP;
2392 goto cleanup;
2393 }
2394
2395 ctx.sa.assoc_num = assoc_num;
2396 ctx.sa.tx_sa = tx_sa;
2397 ctx.sa.update_pn = !!prev_pn.full64;
2398 ctx.secy = secy;
2399
2400 ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
2401 if (ret)
2402 goto cleanup;
2403 }
2404
2405 rtnl_unlock();
2406
2407 return 0;
2408
2409 cleanup:
2410 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2411 spin_lock_bh(&tx_sa->lock);
2412 tx_sa->next_pn_halves = prev_pn;
2413 spin_unlock_bh(&tx_sa->lock);
2414 }
2415 tx_sa->active = was_active;
2416 secy->operational = was_operational;
2417 rtnl_unlock();
2418 return ret;
2419 }
2420
2421 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2422 {
2423 struct nlattr **attrs = info->attrs;
2424 struct net_device *dev;
2425 struct macsec_secy *secy;
2426 struct macsec_rx_sc *rx_sc;
2427 struct macsec_rx_sa *rx_sa;
2428 u8 assoc_num;
2429 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2430 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2431 bool was_active;
2432 pn_t prev_pn;
2433 int ret = 0;
2434
2435 prev_pn.full64 = 0;
2436
2437 if (!attrs[MACSEC_ATTR_IFINDEX])
2438 return -EINVAL;
2439
2440 if (parse_rxsc_config(attrs, tb_rxsc))
2441 return -EINVAL;
2442
2443 if (parse_sa_config(attrs, tb_sa))
2444 return -EINVAL;
2445
2446 if (!validate_upd_sa(tb_sa))
2447 return -EINVAL;
2448
2449 rtnl_lock();
2450 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2451 &dev, &secy, &rx_sc, &assoc_num);
2452 if (IS_ERR(rx_sa)) {
2453 rtnl_unlock();
2454 return PTR_ERR(rx_sa);
2455 }
2456
2457 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2458 int pn_len;
2459
2460 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2461 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2462 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
2463 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2464 rtnl_unlock();
2465 return -EINVAL;
2466 }
2467
2468 spin_lock_bh(&rx_sa->lock);
2469 prev_pn = rx_sa->next_pn_halves;
2470 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2471 spin_unlock_bh(&rx_sa->lock);
2472 }
2473
2474 was_active = rx_sa->active;
2475 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2476 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2477
2478 /* If h/w offloading is available, propagate to the device */
2479 if (macsec_is_offloaded(netdev_priv(dev))) {
2480 const struct macsec_ops *ops;
2481 struct macsec_context ctx;
2482
2483 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2484 if (!ops) {
2485 ret = -EOPNOTSUPP;
2486 goto cleanup;
2487 }
2488
2489 ctx.sa.assoc_num = assoc_num;
2490 ctx.sa.rx_sa = rx_sa;
2491 ctx.sa.update_pn = !!prev_pn.full64;
2492 ctx.secy = secy;
2493
2494 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2495 if (ret)
2496 goto cleanup;
2497 }
2498
2499 rtnl_unlock();
2500 return 0;
2501
2502 cleanup:
2503 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2504 spin_lock_bh(&rx_sa->lock);
2505 rx_sa->next_pn_halves = prev_pn;
2506 spin_unlock_bh(&rx_sa->lock);
2507 }
2508 rx_sa->active = was_active;
2509 rtnl_unlock();
2510 return ret;
2511 }
2512
2513 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2514 {
2515 struct nlattr **attrs = info->attrs;
2516 struct net_device *dev;
2517 struct macsec_secy *secy;
2518 struct macsec_rx_sc *rx_sc;
2519 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2520 unsigned int prev_n_rx_sc;
2521 bool was_active;
2522 int ret;
2523
2524 if (!attrs[MACSEC_ATTR_IFINDEX])
2525 return -EINVAL;
2526
2527 if (parse_rxsc_config(attrs, tb_rxsc))
2528 return -EINVAL;
2529
2530 if (!validate_add_rxsc(tb_rxsc))
2531 return -EINVAL;
2532
2533 rtnl_lock();
2534 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2535 if (IS_ERR(rx_sc)) {
2536 rtnl_unlock();
2537 return PTR_ERR(rx_sc);
2538 }
2539
2540 was_active = rx_sc->active;
2541 prev_n_rx_sc = secy->n_rx_sc;
2542 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2543 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2544
2545 if (rx_sc->active != new)
2546 secy->n_rx_sc += new ? 1 : -1;
2547
2548 rx_sc->active = new;
2549 }
2550
2551 /* If h/w offloading is available, propagate to the device */
2552 if (macsec_is_offloaded(netdev_priv(dev))) {
2553 const struct macsec_ops *ops;
2554 struct macsec_context ctx;
2555
2556 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2557 if (!ops) {
2558 ret = -EOPNOTSUPP;
2559 goto cleanup;
2560 }
2561
2562 ctx.rx_sc = rx_sc;
2563 ctx.secy = secy;
2564
2565 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2566 if (ret)
2567 goto cleanup;
2568 }
2569
2570 rtnl_unlock();
2571
2572 return 0;
2573
2574 cleanup:
2575 secy->n_rx_sc = prev_n_rx_sc;
2576 rx_sc->active = was_active;
2577 rtnl_unlock();
2578 return ret;
2579 }
2580
2581 static bool macsec_is_configured(struct macsec_dev *macsec)
2582 {
2583 struct macsec_secy *secy = &macsec->secy;
2584 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2585 int i;
2586
2587 if (secy->rx_sc)
2588 return true;
2589
2590 for (i = 0; i < MACSEC_NUM_AN; i++)
2591 if (tx_sc->sa[i])
2592 return true;
2593
2594 return false;
2595 }
2596
2597 static bool macsec_needs_tx_tag(struct macsec_dev *macsec,
2598 const struct macsec_ops *ops)
2599 {
2600 return macsec->offload == MACSEC_OFFLOAD_PHY &&
2601 ops->mdo_insert_tx_tag;
2602 }
2603
2604 static void macsec_set_head_tail_room(struct net_device *dev)
2605 {
2606 struct macsec_dev *macsec = macsec_priv(dev);
2607 struct net_device *real_dev = macsec->real_dev;
2608 int needed_headroom, needed_tailroom;
2609 const struct macsec_ops *ops;
2610
2611 ops = macsec_get_ops(macsec, NULL);
2612 if (ops) {
2613 needed_headroom = ops->needed_headroom;
2614 needed_tailroom = ops->needed_tailroom;
2615 } else {
2616 needed_headroom = MACSEC_NEEDED_HEADROOM;
2617 needed_tailroom = MACSEC_NEEDED_TAILROOM;
2618 }
2619
2620 dev->needed_headroom = real_dev->needed_headroom + needed_headroom;
2621 dev->needed_tailroom = real_dev->needed_tailroom + needed_tailroom;
2622 }
2623
2624 static void macsec_inherit_tso_max(struct net_device *dev)
2625 {
2626 struct macsec_dev *macsec = macsec_priv(dev);
2627
2628 /* if macsec is offloaded, we need to follow the lower
2629 * device's capabilities. otherwise, we can ignore them.
2630 */
2631 if (macsec_is_offloaded(macsec))
2632 netif_inherit_tso_max(dev, macsec->real_dev);
2633 }
2634
2635 static int macsec_update_offload(struct net_device *dev, enum macsec_offload offload)
2636 {
2637 enum macsec_offload prev_offload;
2638 const struct macsec_ops *ops;
2639 struct macsec_context ctx;
2640 struct macsec_dev *macsec;
2641 int ret = 0;
2642
2643 macsec = macsec_priv(dev);
2644
2645 /* Check if the offloading mode is supported by the underlying layers */
2646 if (offload != MACSEC_OFFLOAD_OFF &&
2647 !macsec_check_offload(offload, macsec))
2648 return -EOPNOTSUPP;
2649
2650 /* Check if the net device is busy. */
2651 if (netif_running(dev))
2652 return -EBUSY;
2653
2654 /* Check if the device already has rules configured: we do not support
2655 * rules migration.
2656 */
2657 if (macsec_is_configured(macsec))
2658 return -EBUSY;
2659
2660 prev_offload = macsec->offload;
2661
2662 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2663 macsec, &ctx);
2664 if (!ops)
2665 return -EOPNOTSUPP;
2666
2667 macsec->offload = offload;
2668
2669 ctx.secy = &macsec->secy;
2670 ret = offload == MACSEC_OFFLOAD_OFF ? macsec_offload(ops->mdo_del_secy, &ctx)
2671 : macsec_offload(ops->mdo_add_secy, &ctx);
2672 if (ret) {
2673 macsec->offload = prev_offload;
2674 return ret;
2675 }
2676
2677 macsec_set_head_tail_room(dev);
2678 macsec->insert_tx_tag = macsec_needs_tx_tag(macsec, ops);
2679
2680 macsec_inherit_tso_max(dev);
2681
2682 netdev_update_features(dev);
2683
2684 return ret;
2685 }
2686
2687 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2688 {
2689 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2690 struct nlattr **attrs = info->attrs;
2691 enum macsec_offload offload;
2692 struct macsec_dev *macsec;
2693 struct net_device *dev;
2694 int ret = 0;
2695
2696 if (!attrs[MACSEC_ATTR_IFINDEX])
2697 return -EINVAL;
2698
2699 if (!attrs[MACSEC_ATTR_OFFLOAD])
2700 return -EINVAL;
2701
2702 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2703 attrs[MACSEC_ATTR_OFFLOAD],
2704 macsec_genl_offload_policy, NULL))
2705 return -EINVAL;
2706
2707 rtnl_lock();
2708
2709 dev = get_dev_from_nl(genl_info_net(info), attrs);
2710 if (IS_ERR(dev)) {
2711 ret = PTR_ERR(dev);
2712 goto out;
2713 }
2714 macsec = macsec_priv(dev);
2715
2716 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) {
2717 ret = -EINVAL;
2718 goto out;
2719 }
2720
2721 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2722
2723 if (macsec->offload != offload)
2724 ret = macsec_update_offload(dev, offload);
2725 out:
2726 rtnl_unlock();
2727 return ret;
2728 }
2729
2730 static void get_tx_sa_stats(struct net_device *dev, int an,
2731 struct macsec_tx_sa *tx_sa,
2732 struct macsec_tx_sa_stats *sum)
2733 {
2734 struct macsec_dev *macsec = macsec_priv(dev);
2735 int cpu;
2736
2737 /* If h/w offloading is available, propagate to the device */
2738 if (macsec_is_offloaded(macsec)) {
2739 const struct macsec_ops *ops;
2740 struct macsec_context ctx;
2741
2742 ops = macsec_get_ops(macsec, &ctx);
2743 if (ops) {
2744 ctx.sa.assoc_num = an;
2745 ctx.sa.tx_sa = tx_sa;
2746 ctx.stats.tx_sa_stats = sum;
2747 ctx.secy = &macsec_priv(dev)->secy;
2748 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
2749 }
2750 return;
2751 }
2752
2753 for_each_possible_cpu(cpu) {
2754 const struct macsec_tx_sa_stats *stats =
2755 per_cpu_ptr(tx_sa->stats, cpu);
2756
2757 sum->OutPktsProtected += stats->OutPktsProtected;
2758 sum->OutPktsEncrypted += stats->OutPktsEncrypted;
2759 }
2760 }
2761
2762 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
2763 {
2764 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
2765 sum->OutPktsProtected) ||
2766 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2767 sum->OutPktsEncrypted))
2768 return -EMSGSIZE;
2769
2770 return 0;
2771 }
2772
2773 static void get_rx_sa_stats(struct net_device *dev,
2774 struct macsec_rx_sc *rx_sc, int an,
2775 struct macsec_rx_sa *rx_sa,
2776 struct macsec_rx_sa_stats *sum)
2777 {
2778 struct macsec_dev *macsec = macsec_priv(dev);
2779 int cpu;
2780
2781 /* If h/w offloading is available, propagate to the device */
2782 if (macsec_is_offloaded(macsec)) {
2783 const struct macsec_ops *ops;
2784 struct macsec_context ctx;
2785
2786 ops = macsec_get_ops(macsec, &ctx);
2787 if (ops) {
2788 ctx.sa.assoc_num = an;
2789 ctx.sa.rx_sa = rx_sa;
2790 ctx.stats.rx_sa_stats = sum;
2791 ctx.secy = &macsec_priv(dev)->secy;
2792 ctx.rx_sc = rx_sc;
2793 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
2794 }
2795 return;
2796 }
2797
2798 for_each_possible_cpu(cpu) {
2799 const struct macsec_rx_sa_stats *stats =
2800 per_cpu_ptr(rx_sa->stats, cpu);
2801
2802 sum->InPktsOK += stats->InPktsOK;
2803 sum->InPktsInvalid += stats->InPktsInvalid;
2804 sum->InPktsNotValid += stats->InPktsNotValid;
2805 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
2806 sum->InPktsUnusedSA += stats->InPktsUnusedSA;
2807 }
2808 }
2809
2810 static int copy_rx_sa_stats(struct sk_buff *skb,
2811 struct macsec_rx_sa_stats *sum)
2812 {
2813 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
2814 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
2815 sum->InPktsInvalid) ||
2816 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
2817 sum->InPktsNotValid) ||
2818 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2819 sum->InPktsNotUsingSA) ||
2820 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
2821 sum->InPktsUnusedSA))
2822 return -EMSGSIZE;
2823
2824 return 0;
2825 }
2826
2827 static void get_rx_sc_stats(struct net_device *dev,
2828 struct macsec_rx_sc *rx_sc,
2829 struct macsec_rx_sc_stats *sum)
2830 {
2831 struct macsec_dev *macsec = macsec_priv(dev);
2832 int cpu;
2833
2834 /* If h/w offloading is available, propagate to the device */
2835 if (macsec_is_offloaded(macsec)) {
2836 const struct macsec_ops *ops;
2837 struct macsec_context ctx;
2838
2839 ops = macsec_get_ops(macsec, &ctx);
2840 if (ops) {
2841 ctx.stats.rx_sc_stats = sum;
2842 ctx.secy = &macsec_priv(dev)->secy;
2843 ctx.rx_sc = rx_sc;
2844 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
2845 }
2846 return;
2847 }
2848
2849 for_each_possible_cpu(cpu) {
2850 const struct pcpu_rx_sc_stats *stats;
2851 struct macsec_rx_sc_stats tmp;
2852 unsigned int start;
2853
2854 stats = per_cpu_ptr(rx_sc->stats, cpu);
2855 do {
2856 start = u64_stats_fetch_begin(&stats->syncp);
2857 memcpy(&tmp, &stats->stats, sizeof(tmp));
2858 } while (u64_stats_fetch_retry(&stats->syncp, start));
2859
2860 sum->InOctetsValidated += tmp.InOctetsValidated;
2861 sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
2862 sum->InPktsUnchecked += tmp.InPktsUnchecked;
2863 sum->InPktsDelayed += tmp.InPktsDelayed;
2864 sum->InPktsOK += tmp.InPktsOK;
2865 sum->InPktsInvalid += tmp.InPktsInvalid;
2866 sum->InPktsLate += tmp.InPktsLate;
2867 sum->InPktsNotValid += tmp.InPktsNotValid;
2868 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2869 sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
2870 }
2871 }
2872
2873 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
2874 {
2875 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2876 sum->InOctetsValidated,
2877 MACSEC_RXSC_STATS_ATTR_PAD) ||
2878 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2879 sum->InOctetsDecrypted,
2880 MACSEC_RXSC_STATS_ATTR_PAD) ||
2881 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2882 sum->InPktsUnchecked,
2883 MACSEC_RXSC_STATS_ATTR_PAD) ||
2884 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2885 sum->InPktsDelayed,
2886 MACSEC_RXSC_STATS_ATTR_PAD) ||
2887 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2888 sum->InPktsOK,
2889 MACSEC_RXSC_STATS_ATTR_PAD) ||
2890 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2891 sum->InPktsInvalid,
2892 MACSEC_RXSC_STATS_ATTR_PAD) ||
2893 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2894 sum->InPktsLate,
2895 MACSEC_RXSC_STATS_ATTR_PAD) ||
2896 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2897 sum->InPktsNotValid,
2898 MACSEC_RXSC_STATS_ATTR_PAD) ||
2899 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2900 sum->InPktsNotUsingSA,
2901 MACSEC_RXSC_STATS_ATTR_PAD) ||
2902 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2903 sum->InPktsUnusedSA,
2904 MACSEC_RXSC_STATS_ATTR_PAD))
2905 return -EMSGSIZE;
2906
2907 return 0;
2908 }
2909
2910 static void get_tx_sc_stats(struct net_device *dev,
2911 struct macsec_tx_sc_stats *sum)
2912 {
2913 struct macsec_dev *macsec = macsec_priv(dev);
2914 int cpu;
2915
2916 /* If h/w offloading is available, propagate to the device */
2917 if (macsec_is_offloaded(macsec)) {
2918 const struct macsec_ops *ops;
2919 struct macsec_context ctx;
2920
2921 ops = macsec_get_ops(macsec, &ctx);
2922 if (ops) {
2923 ctx.stats.tx_sc_stats = sum;
2924 ctx.secy = &macsec_priv(dev)->secy;
2925 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
2926 }
2927 return;
2928 }
2929
2930 for_each_possible_cpu(cpu) {
2931 const struct pcpu_tx_sc_stats *stats;
2932 struct macsec_tx_sc_stats tmp;
2933 unsigned int start;
2934
2935 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
2936 do {
2937 start = u64_stats_fetch_begin(&stats->syncp);
2938 memcpy(&tmp, &stats->stats, sizeof(tmp));
2939 } while (u64_stats_fetch_retry(&stats->syncp, start));
2940
2941 sum->OutPktsProtected += tmp.OutPktsProtected;
2942 sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
2943 sum->OutOctetsProtected += tmp.OutOctetsProtected;
2944 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2945 }
2946 }
2947
2948 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
2949 {
2950 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2951 sum->OutPktsProtected,
2952 MACSEC_TXSC_STATS_ATTR_PAD) ||
2953 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2954 sum->OutPktsEncrypted,
2955 MACSEC_TXSC_STATS_ATTR_PAD) ||
2956 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2957 sum->OutOctetsProtected,
2958 MACSEC_TXSC_STATS_ATTR_PAD) ||
2959 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2960 sum->OutOctetsEncrypted,
2961 MACSEC_TXSC_STATS_ATTR_PAD))
2962 return -EMSGSIZE;
2963
2964 return 0;
2965 }
2966
2967 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
2968 {
2969 struct macsec_dev *macsec = macsec_priv(dev);
2970 int cpu;
2971
2972 /* If h/w offloading is available, propagate to the device */
2973 if (macsec_is_offloaded(macsec)) {
2974 const struct macsec_ops *ops;
2975 struct macsec_context ctx;
2976
2977 ops = macsec_get_ops(macsec, &ctx);
2978 if (ops) {
2979 ctx.stats.dev_stats = sum;
2980 ctx.secy = &macsec_priv(dev)->secy;
2981 macsec_offload(ops->mdo_get_dev_stats, &ctx);
2982 }
2983 return;
2984 }
2985
2986 for_each_possible_cpu(cpu) {
2987 const struct pcpu_secy_stats *stats;
2988 struct macsec_dev_stats tmp;
2989 unsigned int start;
2990
2991 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
2992 do {
2993 start = u64_stats_fetch_begin(&stats->syncp);
2994 memcpy(&tmp, &stats->stats, sizeof(tmp));
2995 } while (u64_stats_fetch_retry(&stats->syncp, start));
2996
2997 sum->OutPktsUntagged += tmp.OutPktsUntagged;
2998 sum->InPktsUntagged += tmp.InPktsUntagged;
2999 sum->OutPktsTooLong += tmp.OutPktsTooLong;
3000 sum->InPktsNoTag += tmp.InPktsNoTag;
3001 sum->InPktsBadTag += tmp.InPktsBadTag;
3002 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
3003 sum->InPktsNoSCI += tmp.InPktsNoSCI;
3004 sum->InPktsOverrun += tmp.InPktsOverrun;
3005 }
3006 }
3007
3008 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
3009 {
3010 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
3011 sum->OutPktsUntagged,
3012 MACSEC_SECY_STATS_ATTR_PAD) ||
3013 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
3014 sum->InPktsUntagged,
3015 MACSEC_SECY_STATS_ATTR_PAD) ||
3016 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
3017 sum->OutPktsTooLong,
3018 MACSEC_SECY_STATS_ATTR_PAD) ||
3019 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
3020 sum->InPktsNoTag,
3021 MACSEC_SECY_STATS_ATTR_PAD) ||
3022 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
3023 sum->InPktsBadTag,
3024 MACSEC_SECY_STATS_ATTR_PAD) ||
3025 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
3026 sum->InPktsUnknownSCI,
3027 MACSEC_SECY_STATS_ATTR_PAD) ||
3028 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
3029 sum->InPktsNoSCI,
3030 MACSEC_SECY_STATS_ATTR_PAD) ||
3031 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
3032 sum->InPktsOverrun,
3033 MACSEC_SECY_STATS_ATTR_PAD))
3034 return -EMSGSIZE;
3035
3036 return 0;
3037 }
3038
3039 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
3040 {
3041 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3042 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
3043 MACSEC_ATTR_SECY);
3044 u64 csid;
3045
3046 if (!secy_nest)
3047 return 1;
3048
3049 switch (secy->key_len) {
3050 case MACSEC_GCM_AES_128_SAK_LEN:
3051 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
3052 break;
3053 case MACSEC_GCM_AES_256_SAK_LEN:
3054 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
3055 break;
3056 default:
3057 goto cancel;
3058 }
3059
3060 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
3061 MACSEC_SECY_ATTR_PAD) ||
3062 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
3063 csid, MACSEC_SECY_ATTR_PAD) ||
3064 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
3065 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
3066 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
3067 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
3068 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
3069 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
3070 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
3071 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
3072 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
3073 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
3074 goto cancel;
3075
3076 if (secy->replay_protect) {
3077 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
3078 goto cancel;
3079 }
3080
3081 nla_nest_end(skb, secy_nest);
3082 return 0;
3083
3084 cancel:
3085 nla_nest_cancel(skb, secy_nest);
3086 return 1;
3087 }
3088
3089 static noinline_for_stack int
3090 dump_secy(struct macsec_secy *secy, struct net_device *dev,
3091 struct sk_buff *skb, struct netlink_callback *cb)
3092 {
3093 struct macsec_tx_sc_stats tx_sc_stats = {0, };
3094 struct macsec_tx_sa_stats tx_sa_stats = {0, };
3095 struct macsec_rx_sc_stats rx_sc_stats = {0, };
3096 struct macsec_rx_sa_stats rx_sa_stats = {0, };
3097 struct macsec_dev *macsec = netdev_priv(dev);
3098 struct macsec_dev_stats dev_stats = {0, };
3099 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3100 struct nlattr *txsa_list, *rxsc_list;
3101 struct macsec_rx_sc *rx_sc;
3102 struct nlattr *attr;
3103 void *hdr;
3104 int i, j;
3105
3106 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3107 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
3108 if (!hdr)
3109 return -EMSGSIZE;
3110
3111 genl_dump_check_consistent(cb, hdr);
3112
3113 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
3114 goto nla_put_failure;
3115
3116 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
3117 if (!attr)
3118 goto nla_put_failure;
3119 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
3120 goto nla_put_failure;
3121 nla_nest_end(skb, attr);
3122
3123 if (nla_put_secy(secy, skb))
3124 goto nla_put_failure;
3125
3126 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
3127 if (!attr)
3128 goto nla_put_failure;
3129
3130 get_tx_sc_stats(dev, &tx_sc_stats);
3131 if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
3132 nla_nest_cancel(skb, attr);
3133 goto nla_put_failure;
3134 }
3135 nla_nest_end(skb, attr);
3136
3137 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
3138 if (!attr)
3139 goto nla_put_failure;
3140 get_secy_stats(dev, &dev_stats);
3141 if (copy_secy_stats(skb, &dev_stats)) {
3142 nla_nest_cancel(skb, attr);
3143 goto nla_put_failure;
3144 }
3145 nla_nest_end(skb, attr);
3146
3147 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
3148 if (!txsa_list)
3149 goto nla_put_failure;
3150 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
3151 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
3152 struct nlattr *txsa_nest;
3153 u64 pn;
3154 int pn_len;
3155
3156 if (!tx_sa)
3157 continue;
3158
3159 txsa_nest = nla_nest_start_noflag(skb, j++);
3160 if (!txsa_nest) {
3161 nla_nest_cancel(skb, txsa_list);
3162 goto nla_put_failure;
3163 }
3164
3165 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
3166 if (!attr) {
3167 nla_nest_cancel(skb, txsa_nest);
3168 nla_nest_cancel(skb, txsa_list);
3169 goto nla_put_failure;
3170 }
3171 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
3172 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
3173 if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
3174 nla_nest_cancel(skb, attr);
3175 nla_nest_cancel(skb, txsa_nest);
3176 nla_nest_cancel(skb, txsa_list);
3177 goto nla_put_failure;
3178 }
3179 nla_nest_end(skb, attr);
3180
3181 if (secy->xpn) {
3182 pn = tx_sa->next_pn;
3183 pn_len = MACSEC_XPN_PN_LEN;
3184 } else {
3185 pn = tx_sa->next_pn_halves.lower;
3186 pn_len = MACSEC_DEFAULT_PN_LEN;
3187 }
3188
3189 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3190 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3191 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
3192 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
3193 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
3194 nla_nest_cancel(skb, txsa_nest);
3195 nla_nest_cancel(skb, txsa_list);
3196 goto nla_put_failure;
3197 }
3198
3199 nla_nest_end(skb, txsa_nest);
3200 }
3201 nla_nest_end(skb, txsa_list);
3202
3203 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
3204 if (!rxsc_list)
3205 goto nla_put_failure;
3206
3207 j = 1;
3208 for_each_rxsc_rtnl(secy, rx_sc) {
3209 int k;
3210 struct nlattr *rxsa_list;
3211 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
3212
3213 if (!rxsc_nest) {
3214 nla_nest_cancel(skb, rxsc_list);
3215 goto nla_put_failure;
3216 }
3217
3218 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
3219 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
3220 MACSEC_RXSC_ATTR_PAD)) {
3221 nla_nest_cancel(skb, rxsc_nest);
3222 nla_nest_cancel(skb, rxsc_list);
3223 goto nla_put_failure;
3224 }
3225
3226 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
3227 if (!attr) {
3228 nla_nest_cancel(skb, rxsc_nest);
3229 nla_nest_cancel(skb, rxsc_list);
3230 goto nla_put_failure;
3231 }
3232 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
3233 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
3234 if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
3235 nla_nest_cancel(skb, attr);
3236 nla_nest_cancel(skb, rxsc_nest);
3237 nla_nest_cancel(skb, rxsc_list);
3238 goto nla_put_failure;
3239 }
3240 nla_nest_end(skb, attr);
3241
3242 rxsa_list = nla_nest_start_noflag(skb,
3243 MACSEC_RXSC_ATTR_SA_LIST);
3244 if (!rxsa_list) {
3245 nla_nest_cancel(skb, rxsc_nest);
3246 nla_nest_cancel(skb, rxsc_list);
3247 goto nla_put_failure;
3248 }
3249
3250 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
3251 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
3252 struct nlattr *rxsa_nest;
3253 u64 pn;
3254 int pn_len;
3255
3256 if (!rx_sa)
3257 continue;
3258
3259 rxsa_nest = nla_nest_start_noflag(skb, k++);
3260 if (!rxsa_nest) {
3261 nla_nest_cancel(skb, rxsa_list);
3262 nla_nest_cancel(skb, rxsc_nest);
3263 nla_nest_cancel(skb, rxsc_list);
3264 goto nla_put_failure;
3265 }
3266
3267 attr = nla_nest_start_noflag(skb,
3268 MACSEC_SA_ATTR_STATS);
3269 if (!attr) {
3270 nla_nest_cancel(skb, rxsa_list);
3271 nla_nest_cancel(skb, rxsc_nest);
3272 nla_nest_cancel(skb, rxsc_list);
3273 goto nla_put_failure;
3274 }
3275 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
3276 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
3277 if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
3278 nla_nest_cancel(skb, attr);
3279 nla_nest_cancel(skb, rxsa_list);
3280 nla_nest_cancel(skb, rxsc_nest);
3281 nla_nest_cancel(skb, rxsc_list);
3282 goto nla_put_failure;
3283 }
3284 nla_nest_end(skb, attr);
3285
3286 if (secy->xpn) {
3287 pn = rx_sa->next_pn;
3288 pn_len = MACSEC_XPN_PN_LEN;
3289 } else {
3290 pn = rx_sa->next_pn_halves.lower;
3291 pn_len = MACSEC_DEFAULT_PN_LEN;
3292 }
3293
3294 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3295 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3296 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
3297 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
3298 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
3299 nla_nest_cancel(skb, rxsa_nest);
3300 nla_nest_cancel(skb, rxsc_nest);
3301 nla_nest_cancel(skb, rxsc_list);
3302 goto nla_put_failure;
3303 }
3304 nla_nest_end(skb, rxsa_nest);
3305 }
3306
3307 nla_nest_end(skb, rxsa_list);
3308 nla_nest_end(skb, rxsc_nest);
3309 }
3310
3311 nla_nest_end(skb, rxsc_list);
3312
3313 genlmsg_end(skb, hdr);
3314
3315 return 0;
3316
3317 nla_put_failure:
3318 genlmsg_cancel(skb, hdr);
3319 return -EMSGSIZE;
3320 }
3321
3322 static int macsec_generation = 1; /* protected by RTNL */
3323
3324 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
3325 {
3326 struct net *net = sock_net(skb->sk);
3327 struct net_device *dev;
3328 int dev_idx, d;
3329
3330 dev_idx = cb->args[0];
3331
3332 d = 0;
3333 rtnl_lock();
3334
3335 cb->seq = macsec_generation;
3336
3337 for_each_netdev(net, dev) {
3338 struct macsec_secy *secy;
3339
3340 if (d < dev_idx)
3341 goto next;
3342
3343 if (!netif_is_macsec(dev))
3344 goto next;
3345
3346 secy = &macsec_priv(dev)->secy;
3347 if (dump_secy(secy, dev, skb, cb) < 0)
3348 goto done;
3349 next:
3350 d++;
3351 }
3352
3353 done:
3354 rtnl_unlock();
3355 cb->args[0] = d;
3356 return skb->len;
3357 }
3358
3359 static const struct genl_small_ops macsec_genl_ops[] = {
3360 {
3361 .cmd = MACSEC_CMD_GET_TXSC,
3362 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3363 .dumpit = macsec_dump_txsc,
3364 },
3365 {
3366 .cmd = MACSEC_CMD_ADD_RXSC,
3367 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3368 .doit = macsec_add_rxsc,
3369 .flags = GENL_ADMIN_PERM,
3370 },
3371 {
3372 .cmd = MACSEC_CMD_DEL_RXSC,
3373 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3374 .doit = macsec_del_rxsc,
3375 .flags = GENL_ADMIN_PERM,
3376 },
3377 {
3378 .cmd = MACSEC_CMD_UPD_RXSC,
3379 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3380 .doit = macsec_upd_rxsc,
3381 .flags = GENL_ADMIN_PERM,
3382 },
3383 {
3384 .cmd = MACSEC_CMD_ADD_TXSA,
3385 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3386 .doit = macsec_add_txsa,
3387 .flags = GENL_ADMIN_PERM,
3388 },
3389 {
3390 .cmd = MACSEC_CMD_DEL_TXSA,
3391 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3392 .doit = macsec_del_txsa,
3393 .flags = GENL_ADMIN_PERM,
3394 },
3395 {
3396 .cmd = MACSEC_CMD_UPD_TXSA,
3397 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3398 .doit = macsec_upd_txsa,
3399 .flags = GENL_ADMIN_PERM,
3400 },
3401 {
3402 .cmd = MACSEC_CMD_ADD_RXSA,
3403 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3404 .doit = macsec_add_rxsa,
3405 .flags = GENL_ADMIN_PERM,
3406 },
3407 {
3408 .cmd = MACSEC_CMD_DEL_RXSA,
3409 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3410 .doit = macsec_del_rxsa,
3411 .flags = GENL_ADMIN_PERM,
3412 },
3413 {
3414 .cmd = MACSEC_CMD_UPD_RXSA,
3415 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3416 .doit = macsec_upd_rxsa,
3417 .flags = GENL_ADMIN_PERM,
3418 },
3419 {
3420 .cmd = MACSEC_CMD_UPD_OFFLOAD,
3421 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3422 .doit = macsec_upd_offload,
3423 .flags = GENL_ADMIN_PERM,
3424 },
3425 };
3426
3427 static struct genl_family macsec_fam __ro_after_init = {
3428 .name = MACSEC_GENL_NAME,
3429 .hdrsize = 0,
3430 .version = MACSEC_GENL_VERSION,
3431 .maxattr = MACSEC_ATTR_MAX,
3432 .policy = macsec_genl_policy,
3433 .netnsok = true,
3434 .module = THIS_MODULE,
3435 .small_ops = macsec_genl_ops,
3436 .n_small_ops = ARRAY_SIZE(macsec_genl_ops),
3437 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1,
3438 };
3439
3440 static struct sk_buff *macsec_insert_tx_tag(struct sk_buff *skb,
3441 struct net_device *dev)
3442 {
3443 struct macsec_dev *macsec = macsec_priv(dev);
3444 const struct macsec_ops *ops;
3445 struct phy_device *phydev;
3446 struct macsec_context ctx;
3447 int skb_final_len;
3448 int err;
3449
3450 ops = macsec_get_ops(macsec, &ctx);
3451 skb_final_len = skb->len - ETH_HLEN + ops->needed_headroom +
3452 ops->needed_tailroom;
3453 if (unlikely(skb_final_len > macsec->real_dev->mtu)) {
3454 err = -EINVAL;
3455 goto cleanup;
3456 }
3457
3458 phydev = macsec->real_dev->phydev;
3459
3460 err = skb_ensure_writable_head_tail(skb, dev);
3461 if (unlikely(err < 0))
3462 goto cleanup;
3463
3464 err = ops->mdo_insert_tx_tag(phydev, skb);
3465 if (unlikely(err))
3466 goto cleanup;
3467
3468 return skb;
3469 cleanup:
3470 kfree_skb(skb);
3471 return ERR_PTR(err);
3472 }
3473
3474 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3475 struct net_device *dev)
3476 {
3477 struct macsec_dev *macsec = netdev_priv(dev);
3478 struct macsec_secy *secy = &macsec->secy;
3479 struct pcpu_secy_stats *secy_stats;
3480 int ret, len;
3481
3482 if (macsec_is_offloaded(netdev_priv(dev))) {
3483 struct metadata_dst *md_dst = secy->tx_sc.md_dst;
3484
3485 skb_dst_drop(skb);
3486 dst_hold(&md_dst->dst);
3487 skb_dst_set(skb, &md_dst->dst);
3488
3489 if (macsec->insert_tx_tag) {
3490 skb = macsec_insert_tx_tag(skb, dev);
3491 if (IS_ERR(skb)) {
3492 DEV_STATS_INC(dev, tx_dropped);
3493 return NETDEV_TX_OK;
3494 }
3495 }
3496
3497 skb->dev = macsec->real_dev;
3498 return dev_queue_xmit(skb);
3499 }
3500
3501 /* 10.5 */
3502 if (!secy->protect_frames) {
3503 secy_stats = this_cpu_ptr(macsec->stats);
3504 u64_stats_update_begin(&secy_stats->syncp);
3505 secy_stats->stats.OutPktsUntagged++;
3506 u64_stats_update_end(&secy_stats->syncp);
3507 skb->dev = macsec->real_dev;
3508 len = skb->len;
3509 ret = dev_queue_xmit(skb);
3510 count_tx(dev, ret, len);
3511 return ret;
3512 }
3513
3514 if (!secy->operational) {
3515 kfree_skb(skb);
3516 DEV_STATS_INC(dev, tx_dropped);
3517 return NETDEV_TX_OK;
3518 }
3519
3520 len = skb->len;
3521 skb = macsec_encrypt(skb, dev);
3522 if (IS_ERR(skb)) {
3523 if (PTR_ERR(skb) != -EINPROGRESS)
3524 DEV_STATS_INC(dev, tx_dropped);
3525 return NETDEV_TX_OK;
3526 }
3527
3528 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3529
3530 macsec_encrypt_finish(skb, dev);
3531 ret = dev_queue_xmit(skb);
3532 count_tx(dev, ret, len);
3533 return ret;
3534 }
3535
3536 #define MACSEC_FEATURES \
3537 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3538
3539 #define MACSEC_OFFLOAD_FEATURES \
3540 (MACSEC_FEATURES | NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES | \
3541 NETIF_F_LRO | NETIF_F_RXHASH | NETIF_F_CSUM_MASK | NETIF_F_RXCSUM)
3542
3543 static int macsec_dev_init(struct net_device *dev)
3544 {
3545 struct macsec_dev *macsec = macsec_priv(dev);
3546 struct net_device *real_dev = macsec->real_dev;
3547 int err;
3548
3549 err = gro_cells_init(&macsec->gro_cells, dev);
3550 if (err)
3551 return err;
3552
3553 macsec_inherit_tso_max(dev);
3554
3555 dev->hw_features = real_dev->hw_features & MACSEC_OFFLOAD_FEATURES;
3556 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
3557
3558 dev->features = real_dev->features & MACSEC_OFFLOAD_FEATURES;
3559 dev->features |= NETIF_F_GSO_SOFTWARE;
3560 dev->lltx = true;
3561 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
3562
3563 macsec_set_head_tail_room(dev);
3564
3565 if (is_zero_ether_addr(dev->dev_addr))
3566 eth_hw_addr_inherit(dev, real_dev);
3567 if (is_zero_ether_addr(dev->broadcast))
3568 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3569
3570 /* Get macsec's reference to real_dev */
3571 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL);
3572
3573 return 0;
3574 }
3575
3576 static void macsec_dev_uninit(struct net_device *dev)
3577 {
3578 struct macsec_dev *macsec = macsec_priv(dev);
3579
3580 gro_cells_destroy(&macsec->gro_cells);
3581 }
3582
3583 static netdev_features_t macsec_fix_features(struct net_device *dev,
3584 netdev_features_t features)
3585 {
3586 struct macsec_dev *macsec = macsec_priv(dev);
3587 struct net_device *real_dev = macsec->real_dev;
3588 netdev_features_t mask;
3589
3590 mask = macsec_is_offloaded(macsec) ? MACSEC_OFFLOAD_FEATURES
3591 : MACSEC_FEATURES;
3592
3593 features &= (real_dev->features & mask) |
3594 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3595
3596 return features;
3597 }
3598
3599 static int macsec_dev_open(struct net_device *dev)
3600 {
3601 struct macsec_dev *macsec = macsec_priv(dev);
3602 struct net_device *real_dev = macsec->real_dev;
3603 int err;
3604
3605 err = dev_uc_add(real_dev, dev->dev_addr);
3606 if (err < 0)
3607 return err;
3608
3609 if (dev->flags & IFF_ALLMULTI) {
3610 err = dev_set_allmulti(real_dev, 1);
3611 if (err < 0)
3612 goto del_unicast;
3613 }
3614
3615 if (dev->flags & IFF_PROMISC) {
3616 err = dev_set_promiscuity(real_dev, 1);
3617 if (err < 0)
3618 goto clear_allmulti;
3619 }
3620
3621 /* If h/w offloading is available, propagate to the device */
3622 if (macsec_is_offloaded(macsec)) {
3623 const struct macsec_ops *ops;
3624 struct macsec_context ctx;
3625
3626 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3627 if (!ops) {
3628 err = -EOPNOTSUPP;
3629 goto clear_allmulti;
3630 }
3631
3632 ctx.secy = &macsec->secy;
3633 err = macsec_offload(ops->mdo_dev_open, &ctx);
3634 if (err)
3635 goto clear_allmulti;
3636 }
3637
3638 if (netif_carrier_ok(real_dev))
3639 netif_carrier_on(dev);
3640
3641 return 0;
3642 clear_allmulti:
3643 if (dev->flags & IFF_ALLMULTI)
3644 dev_set_allmulti(real_dev, -1);
3645 del_unicast:
3646 dev_uc_del(real_dev, dev->dev_addr);
3647 netif_carrier_off(dev);
3648 return err;
3649 }
3650
3651 static int macsec_dev_stop(struct net_device *dev)
3652 {
3653 struct macsec_dev *macsec = macsec_priv(dev);
3654 struct net_device *real_dev = macsec->real_dev;
3655
3656 netif_carrier_off(dev);
3657
3658 /* If h/w offloading is available, propagate to the device */
3659 if (macsec_is_offloaded(macsec)) {
3660 const struct macsec_ops *ops;
3661 struct macsec_context ctx;
3662
3663 ops = macsec_get_ops(macsec, &ctx);
3664 if (ops) {
3665 ctx.secy = &macsec->secy;
3666 macsec_offload(ops->mdo_dev_stop, &ctx);
3667 }
3668 }
3669
3670 dev_mc_unsync(real_dev, dev);
3671 dev_uc_unsync(real_dev, dev);
3672
3673 if (dev->flags & IFF_ALLMULTI)
3674 dev_set_allmulti(real_dev, -1);
3675
3676 if (dev->flags & IFF_PROMISC)
3677 dev_set_promiscuity(real_dev, -1);
3678
3679 dev_uc_del(real_dev, dev->dev_addr);
3680
3681 return 0;
3682 }
3683
3684 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3685 {
3686 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3687
3688 if (!(dev->flags & IFF_UP))
3689 return;
3690
3691 if (change & IFF_ALLMULTI)
3692 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3693
3694 if (change & IFF_PROMISC)
3695 dev_set_promiscuity(real_dev,
3696 dev->flags & IFF_PROMISC ? 1 : -1);
3697 }
3698
3699 static void macsec_dev_set_rx_mode(struct net_device *dev)
3700 {
3701 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3702
3703 dev_mc_sync(real_dev, dev);
3704 dev_uc_sync(real_dev, dev);
3705 }
3706
3707 static int macsec_set_mac_address(struct net_device *dev, void *p)
3708 {
3709 struct macsec_dev *macsec = macsec_priv(dev);
3710 struct net_device *real_dev = macsec->real_dev;
3711 struct sockaddr *addr = p;
3712 u8 old_addr[ETH_ALEN];
3713 int err;
3714
3715 if (!is_valid_ether_addr(addr->sa_data))
3716 return -EADDRNOTAVAIL;
3717
3718 if (dev->flags & IFF_UP) {
3719 err = dev_uc_add(real_dev, addr->sa_data);
3720 if (err < 0)
3721 return err;
3722 }
3723
3724 ether_addr_copy(old_addr, dev->dev_addr);
3725 eth_hw_addr_set(dev, addr->sa_data);
3726
3727 /* If h/w offloading is available, propagate to the device */
3728 if (macsec_is_offloaded(macsec)) {
3729 const struct macsec_ops *ops;
3730 struct macsec_context ctx;
3731
3732 ops = macsec_get_ops(macsec, &ctx);
3733 if (!ops) {
3734 err = -EOPNOTSUPP;
3735 goto restore_old_addr;
3736 }
3737
3738 ctx.secy = &macsec->secy;
3739 err = macsec_offload(ops->mdo_upd_secy, &ctx);
3740 if (err)
3741 goto restore_old_addr;
3742 }
3743
3744 if (dev->flags & IFF_UP)
3745 dev_uc_del(real_dev, old_addr);
3746
3747 return 0;
3748
3749 restore_old_addr:
3750 if (dev->flags & IFF_UP)
3751 dev_uc_del(real_dev, addr->sa_data);
3752
3753 eth_hw_addr_set(dev, old_addr);
3754
3755 return err;
3756 }
3757
3758 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3759 {
3760 struct macsec_dev *macsec = macsec_priv(dev);
3761 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3762
3763 if (macsec->real_dev->mtu - extra < new_mtu)
3764 return -ERANGE;
3765
3766 WRITE_ONCE(dev->mtu, new_mtu);
3767
3768 return 0;
3769 }
3770
3771 static void macsec_get_stats64(struct net_device *dev,
3772 struct rtnl_link_stats64 *s)
3773 {
3774 if (!dev->tstats)
3775 return;
3776
3777 dev_fetch_sw_netstats(s, dev->tstats);
3778
3779 s->rx_dropped = DEV_STATS_READ(dev, rx_dropped);
3780 s->tx_dropped = DEV_STATS_READ(dev, tx_dropped);
3781 s->rx_errors = DEV_STATS_READ(dev, rx_errors);
3782 }
3783
3784 static int macsec_get_iflink(const struct net_device *dev)
3785 {
3786 return READ_ONCE(macsec_priv(dev)->real_dev->ifindex);
3787 }
3788
3789 static const struct net_device_ops macsec_netdev_ops = {
3790 .ndo_init = macsec_dev_init,
3791 .ndo_uninit = macsec_dev_uninit,
3792 .ndo_open = macsec_dev_open,
3793 .ndo_stop = macsec_dev_stop,
3794 .ndo_fix_features = macsec_fix_features,
3795 .ndo_change_mtu = macsec_change_mtu,
3796 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
3797 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
3798 .ndo_set_mac_address = macsec_set_mac_address,
3799 .ndo_start_xmit = macsec_start_xmit,
3800 .ndo_get_stats64 = macsec_get_stats64,
3801 .ndo_get_iflink = macsec_get_iflink,
3802 };
3803
3804 static const struct device_type macsec_type = {
3805 .name = "macsec",
3806 };
3807
3808 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3809 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3810 [IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3811 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3812 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3813 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3814 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3815 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3816 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3817 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3818 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3819 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3820 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3821 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3822 [IFLA_MACSEC_OFFLOAD] = { .type = NLA_U8 },
3823 };
3824
3825 static void macsec_free_netdev(struct net_device *dev)
3826 {
3827 struct macsec_dev *macsec = macsec_priv(dev);
3828
3829 dst_release(&macsec->secy.tx_sc.md_dst->dst);
3830 free_percpu(macsec->stats);
3831 free_percpu(macsec->secy.tx_sc.stats);
3832
3833 /* Get rid of the macsec's reference to real_dev */
3834 netdev_put(macsec->real_dev, &macsec->dev_tracker);
3835 }
3836
3837 static void macsec_setup(struct net_device *dev)
3838 {
3839 ether_setup(dev);
3840 dev->min_mtu = 0;
3841 dev->max_mtu = ETH_MAX_MTU;
3842 dev->priv_flags |= IFF_NO_QUEUE;
3843 dev->netdev_ops = &macsec_netdev_ops;
3844 dev->needs_free_netdev = true;
3845 dev->priv_destructor = macsec_free_netdev;
3846 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3847
3848 eth_zero_addr(dev->broadcast);
3849 }
3850
3851 static int macsec_changelink_common(struct net_device *dev,
3852 struct nlattr *data[])
3853 {
3854 struct macsec_secy *secy;
3855 struct macsec_tx_sc *tx_sc;
3856
3857 secy = &macsec_priv(dev)->secy;
3858 tx_sc = &secy->tx_sc;
3859
3860 if (data[IFLA_MACSEC_ENCODING_SA]) {
3861 struct macsec_tx_sa *tx_sa;
3862
3863 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3864 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3865
3866 secy->operational = tx_sa && tx_sa->active;
3867 }
3868
3869 if (data[IFLA_MACSEC_ENCRYPT])
3870 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3871
3872 if (data[IFLA_MACSEC_PROTECT])
3873 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3874
3875 if (data[IFLA_MACSEC_INC_SCI])
3876 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3877
3878 if (data[IFLA_MACSEC_ES])
3879 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3880
3881 if (data[IFLA_MACSEC_SCB])
3882 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3883
3884 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3885 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3886
3887 if (data[IFLA_MACSEC_VALIDATION])
3888 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3889
3890 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3891 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3892 case MACSEC_CIPHER_ID_GCM_AES_128:
3893 case MACSEC_DEFAULT_CIPHER_ID:
3894 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3895 secy->xpn = false;
3896 break;
3897 case MACSEC_CIPHER_ID_GCM_AES_256:
3898 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3899 secy->xpn = false;
3900 break;
3901 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
3902 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3903 secy->xpn = true;
3904 break;
3905 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
3906 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3907 secy->xpn = true;
3908 break;
3909 default:
3910 return -EINVAL;
3911 }
3912 }
3913
3914 if (data[IFLA_MACSEC_WINDOW]) {
3915 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3916
3917 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window
3918 * for XPN cipher suites */
3919 if (secy->xpn &&
3920 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW)
3921 return -EINVAL;
3922 }
3923
3924 return 0;
3925 }
3926
3927 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3928 struct nlattr *data[],
3929 struct netlink_ext_ack *extack)
3930 {
3931 struct macsec_dev *macsec = macsec_priv(dev);
3932 bool macsec_offload_state_change = false;
3933 enum macsec_offload offload;
3934 struct macsec_tx_sc tx_sc;
3935 struct macsec_secy secy;
3936 int ret;
3937
3938 if (!data)
3939 return 0;
3940
3941 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3942 data[IFLA_MACSEC_ICV_LEN] ||
3943 data[IFLA_MACSEC_SCI] ||
3944 data[IFLA_MACSEC_PORT])
3945 return -EINVAL;
3946
3947 /* Keep a copy of unmodified secy and tx_sc, in case the offload
3948 * propagation fails, to revert macsec_changelink_common.
3949 */
3950 memcpy(&secy, &macsec->secy, sizeof(secy));
3951 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3952
3953 ret = macsec_changelink_common(dev, data);
3954 if (ret)
3955 goto cleanup;
3956
3957 if (data[IFLA_MACSEC_OFFLOAD]) {
3958 offload = nla_get_u8(data[IFLA_MACSEC_OFFLOAD]);
3959 if (macsec->offload != offload) {
3960 macsec_offload_state_change = true;
3961 ret = macsec_update_offload(dev, offload);
3962 if (ret)
3963 goto cleanup;
3964 }
3965 }
3966
3967 /* If h/w offloading is available, propagate to the device */
3968 if (!macsec_offload_state_change && macsec_is_offloaded(macsec)) {
3969 const struct macsec_ops *ops;
3970 struct macsec_context ctx;
3971
3972 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3973 if (!ops) {
3974 ret = -EOPNOTSUPP;
3975 goto cleanup;
3976 }
3977
3978 ctx.secy = &macsec->secy;
3979 ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3980 if (ret)
3981 goto cleanup;
3982 }
3983
3984 return 0;
3985
3986 cleanup:
3987 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3988 memcpy(&macsec->secy, &secy, sizeof(secy));
3989
3990 return ret;
3991 }
3992
3993 static void macsec_del_dev(struct macsec_dev *macsec)
3994 {
3995 int i;
3996
3997 while (macsec->secy.rx_sc) {
3998 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3999
4000 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
4001 free_rx_sc(rx_sc);
4002 }
4003
4004 for (i = 0; i < MACSEC_NUM_AN; i++) {
4005 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
4006
4007 if (sa) {
4008 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
4009 clear_tx_sa(sa);
4010 }
4011 }
4012 }
4013
4014 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
4015 {
4016 struct macsec_dev *macsec = macsec_priv(dev);
4017 struct net_device *real_dev = macsec->real_dev;
4018
4019 /* If h/w offloading is available, propagate to the device */
4020 if (macsec_is_offloaded(macsec)) {
4021 const struct macsec_ops *ops;
4022 struct macsec_context ctx;
4023
4024 ops = macsec_get_ops(netdev_priv(dev), &ctx);
4025 if (ops) {
4026 ctx.secy = &macsec->secy;
4027 macsec_offload(ops->mdo_del_secy, &ctx);
4028 }
4029 }
4030
4031 unregister_netdevice_queue(dev, head);
4032 list_del_rcu(&macsec->secys);
4033 macsec_del_dev(macsec);
4034 netdev_upper_dev_unlink(real_dev, dev);
4035
4036 macsec_generation++;
4037 }
4038
4039 static void macsec_dellink(struct net_device *dev, struct list_head *head)
4040 {
4041 struct macsec_dev *macsec = macsec_priv(dev);
4042 struct net_device *real_dev = macsec->real_dev;
4043 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
4044
4045 macsec_common_dellink(dev, head);
4046
4047 if (list_empty(&rxd->secys)) {
4048 netdev_rx_handler_unregister(real_dev);
4049 kfree(rxd);
4050 }
4051 }
4052
4053 static int register_macsec_dev(struct net_device *real_dev,
4054 struct net_device *dev)
4055 {
4056 struct macsec_dev *macsec = macsec_priv(dev);
4057 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
4058
4059 if (!rxd) {
4060 int err;
4061
4062 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
4063 if (!rxd)
4064 return -ENOMEM;
4065
4066 INIT_LIST_HEAD(&rxd->secys);
4067
4068 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
4069 rxd);
4070 if (err < 0) {
4071 kfree(rxd);
4072 return err;
4073 }
4074 }
4075
4076 list_add_tail_rcu(&macsec->secys, &rxd->secys);
4077 return 0;
4078 }
4079
4080 static bool sci_exists(struct net_device *dev, sci_t sci)
4081 {
4082 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
4083 struct macsec_dev *macsec;
4084
4085 list_for_each_entry(macsec, &rxd->secys, secys) {
4086 if (macsec->secy.sci == sci)
4087 return true;
4088 }
4089
4090 return false;
4091 }
4092
4093 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
4094 {
4095 return make_sci(dev->dev_addr, port);
4096 }
4097
4098 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
4099 {
4100 struct macsec_dev *macsec = macsec_priv(dev);
4101 struct macsec_secy *secy = &macsec->secy;
4102
4103 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
4104 if (!macsec->stats)
4105 return -ENOMEM;
4106
4107 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
4108 if (!secy->tx_sc.stats)
4109 return -ENOMEM;
4110
4111 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL);
4112 if (!secy->tx_sc.md_dst)
4113 /* macsec and secy percpu stats will be freed when unregistering
4114 * net_device in macsec_free_netdev()
4115 */
4116 return -ENOMEM;
4117
4118 if (sci == MACSEC_UNDEF_SCI)
4119 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4120
4121 secy->netdev = dev;
4122 secy->operational = true;
4123 secy->key_len = DEFAULT_SAK_LEN;
4124 secy->icv_len = icv_len;
4125 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
4126 secy->protect_frames = true;
4127 secy->replay_protect = false;
4128 secy->xpn = DEFAULT_XPN;
4129
4130 secy->sci = sci;
4131 secy->tx_sc.md_dst->u.macsec_info.sci = sci;
4132 secy->tx_sc.active = true;
4133 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
4134 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
4135 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
4136 secy->tx_sc.end_station = false;
4137 secy->tx_sc.scb = false;
4138
4139 return 0;
4140 }
4141
4142 static struct lock_class_key macsec_netdev_addr_lock_key;
4143
4144 static int macsec_newlink(struct net *net, struct net_device *dev,
4145 struct nlattr *tb[], struct nlattr *data[],
4146 struct netlink_ext_ack *extack)
4147 {
4148 struct macsec_dev *macsec = macsec_priv(dev);
4149 rx_handler_func_t *rx_handler;
4150 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4151 struct net_device *real_dev;
4152 int err, mtu;
4153 sci_t sci;
4154
4155 if (!tb[IFLA_LINK])
4156 return -EINVAL;
4157 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
4158 if (!real_dev)
4159 return -ENODEV;
4160 if (real_dev->type != ARPHRD_ETHER)
4161 return -EINVAL;
4162
4163 dev->priv_flags |= IFF_MACSEC;
4164
4165 macsec->real_dev = real_dev;
4166
4167 if (data && data[IFLA_MACSEC_OFFLOAD])
4168 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
4169 else
4170 /* MACsec offloading is off by default */
4171 macsec->offload = MACSEC_OFFLOAD_OFF;
4172
4173 /* Check if the offloading mode is supported by the underlying layers */
4174 if (macsec->offload != MACSEC_OFFLOAD_OFF &&
4175 !macsec_check_offload(macsec->offload, macsec))
4176 return -EOPNOTSUPP;
4177
4178 /* send_sci must be set to true when transmit sci explicitly is set */
4179 if ((data && data[IFLA_MACSEC_SCI]) &&
4180 (data && data[IFLA_MACSEC_INC_SCI])) {
4181 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
4182
4183 if (!send_sci)
4184 return -EINVAL;
4185 }
4186
4187 if (data && data[IFLA_MACSEC_ICV_LEN])
4188 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4189 mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
4190 if (mtu < 0)
4191 dev->mtu = 0;
4192 else
4193 dev->mtu = mtu;
4194
4195 rx_handler = rtnl_dereference(real_dev->rx_handler);
4196 if (rx_handler && rx_handler != macsec_handle_frame)
4197 return -EBUSY;
4198
4199 err = register_netdevice(dev);
4200 if (err < 0)
4201 return err;
4202
4203 netdev_lockdep_set_classes(dev);
4204 lockdep_set_class(&dev->addr_list_lock,
4205 &macsec_netdev_addr_lock_key);
4206
4207 err = netdev_upper_dev_link(real_dev, dev, extack);
4208 if (err < 0)
4209 goto unregister;
4210
4211 /* need to be already registered so that ->init has run and
4212 * the MAC addr is set
4213 */
4214 if (data && data[IFLA_MACSEC_SCI])
4215 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
4216 else if (data && data[IFLA_MACSEC_PORT])
4217 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
4218 else
4219 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4220
4221 if (rx_handler && sci_exists(real_dev, sci)) {
4222 err = -EBUSY;
4223 goto unlink;
4224 }
4225
4226 err = macsec_add_dev(dev, sci, icv_len);
4227 if (err)
4228 goto unlink;
4229
4230 if (data) {
4231 err = macsec_changelink_common(dev, data);
4232 if (err)
4233 goto del_dev;
4234 }
4235
4236 /* If h/w offloading is available, propagate to the device */
4237 if (macsec_is_offloaded(macsec)) {
4238 const struct macsec_ops *ops;
4239 struct macsec_context ctx;
4240
4241 ops = macsec_get_ops(macsec, &ctx);
4242 if (ops) {
4243 ctx.secy = &macsec->secy;
4244 err = macsec_offload(ops->mdo_add_secy, &ctx);
4245 if (err)
4246 goto del_dev;
4247
4248 macsec->insert_tx_tag =
4249 macsec_needs_tx_tag(macsec, ops);
4250 }
4251 }
4252
4253 err = register_macsec_dev(real_dev, dev);
4254 if (err < 0)
4255 goto del_dev;
4256
4257 netif_stacked_transfer_operstate(real_dev, dev);
4258 linkwatch_fire_event(dev);
4259
4260 macsec_generation++;
4261
4262 return 0;
4263
4264 del_dev:
4265 macsec_del_dev(macsec);
4266 unlink:
4267 netdev_upper_dev_unlink(real_dev, dev);
4268 unregister:
4269 unregister_netdevice(dev);
4270 return err;
4271 }
4272
4273 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
4274 struct netlink_ext_ack *extack)
4275 {
4276 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
4277 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4278 int flag;
4279 bool es, scb, sci;
4280
4281 if (!data)
4282 return 0;
4283
4284 if (data[IFLA_MACSEC_CIPHER_SUITE])
4285 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
4286
4287 if (data[IFLA_MACSEC_ICV_LEN]) {
4288 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4289 if (icv_len != MACSEC_DEFAULT_ICV_LEN) {
4290 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
4291 struct crypto_aead *dummy_tfm;
4292
4293 dummy_tfm = macsec_alloc_tfm(dummy_key,
4294 DEFAULT_SAK_LEN,
4295 icv_len);
4296 if (IS_ERR(dummy_tfm))
4297 return PTR_ERR(dummy_tfm);
4298 crypto_free_aead(dummy_tfm);
4299 }
4300 }
4301
4302 switch (csid) {
4303 case MACSEC_CIPHER_ID_GCM_AES_128:
4304 case MACSEC_CIPHER_ID_GCM_AES_256:
4305 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
4306 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
4307 case MACSEC_DEFAULT_CIPHER_ID:
4308 if (icv_len < MACSEC_MIN_ICV_LEN ||
4309 icv_len > MACSEC_STD_ICV_LEN)
4310 return -EINVAL;
4311 break;
4312 default:
4313 return -EINVAL;
4314 }
4315
4316 if (data[IFLA_MACSEC_ENCODING_SA]) {
4317 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
4318 return -EINVAL;
4319 }
4320
4321 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
4322 flag < IFLA_MACSEC_VALIDATION;
4323 flag++) {
4324 if (data[flag]) {
4325 if (nla_get_u8(data[flag]) > 1)
4326 return -EINVAL;
4327 }
4328 }
4329
4330 es = nla_get_u8_default(data[IFLA_MACSEC_ES], false);
4331 sci = nla_get_u8_default(data[IFLA_MACSEC_INC_SCI], false);
4332 scb = nla_get_u8_default(data[IFLA_MACSEC_SCB], false);
4333
4334 if ((sci && (scb || es)) || (scb && es))
4335 return -EINVAL;
4336
4337 if (data[IFLA_MACSEC_VALIDATION] &&
4338 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
4339 return -EINVAL;
4340
4341 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
4342 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
4343 !data[IFLA_MACSEC_WINDOW])
4344 return -EINVAL;
4345
4346 return 0;
4347 }
4348
4349 static struct net *macsec_get_link_net(const struct net_device *dev)
4350 {
4351 return dev_net(macsec_priv(dev)->real_dev);
4352 }
4353
4354 struct net_device *macsec_get_real_dev(const struct net_device *dev)
4355 {
4356 return macsec_priv(dev)->real_dev;
4357 }
4358 EXPORT_SYMBOL_GPL(macsec_get_real_dev);
4359
4360 bool macsec_netdev_is_offloaded(struct net_device *dev)
4361 {
4362 return macsec_is_offloaded(macsec_priv(dev));
4363 }
4364 EXPORT_SYMBOL_GPL(macsec_netdev_is_offloaded);
4365
4366 static size_t macsec_get_size(const struct net_device *dev)
4367 {
4368 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
4369 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
4370 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
4371 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
4372 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
4373 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
4374 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
4375 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
4376 nla_total_size(1) + /* IFLA_MACSEC_ES */
4377 nla_total_size(1) + /* IFLA_MACSEC_SCB */
4378 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
4379 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
4380 nla_total_size(1) + /* IFLA_MACSEC_OFFLOAD */
4381 0;
4382 }
4383
4384 static int macsec_fill_info(struct sk_buff *skb,
4385 const struct net_device *dev)
4386 {
4387 struct macsec_tx_sc *tx_sc;
4388 struct macsec_dev *macsec;
4389 struct macsec_secy *secy;
4390 u64 csid;
4391
4392 macsec = macsec_priv(dev);
4393 secy = &macsec->secy;
4394 tx_sc = &secy->tx_sc;
4395
4396 switch (secy->key_len) {
4397 case MACSEC_GCM_AES_128_SAK_LEN:
4398 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
4399 break;
4400 case MACSEC_GCM_AES_256_SAK_LEN:
4401 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
4402 break;
4403 default:
4404 goto nla_put_failure;
4405 }
4406
4407 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
4408 IFLA_MACSEC_PAD) ||
4409 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
4410 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
4411 csid, IFLA_MACSEC_PAD) ||
4412 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
4413 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
4414 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
4415 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
4416 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
4417 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
4418 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
4419 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
4420 nla_put_u8(skb, IFLA_MACSEC_OFFLOAD, macsec->offload) ||
4421 0)
4422 goto nla_put_failure;
4423
4424 if (secy->replay_protect) {
4425 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
4426 goto nla_put_failure;
4427 }
4428
4429 return 0;
4430
4431 nla_put_failure:
4432 return -EMSGSIZE;
4433 }
4434
4435 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
4436 .kind = "macsec",
4437 .priv_size = sizeof(struct macsec_dev),
4438 .maxtype = IFLA_MACSEC_MAX,
4439 .policy = macsec_rtnl_policy,
4440 .setup = macsec_setup,
4441 .validate = macsec_validate_attr,
4442 .newlink = macsec_newlink,
4443 .changelink = macsec_changelink,
4444 .dellink = macsec_dellink,
4445 .get_size = macsec_get_size,
4446 .fill_info = macsec_fill_info,
4447 .get_link_net = macsec_get_link_net,
4448 };
4449
4450 static bool is_macsec_master(struct net_device *dev)
4451 {
4452 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
4453 }
4454
4455 static int macsec_notify(struct notifier_block *this, unsigned long event,
4456 void *ptr)
4457 {
4458 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
4459 struct macsec_rxh_data *rxd;
4460 struct macsec_dev *m, *n;
4461 LIST_HEAD(head);
4462
4463 if (!is_macsec_master(real_dev))
4464 return NOTIFY_DONE;
4465
4466 rxd = macsec_data_rtnl(real_dev);
4467
4468 switch (event) {
4469 case NETDEV_DOWN:
4470 case NETDEV_UP:
4471 case NETDEV_CHANGE:
4472 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4473 struct net_device *dev = m->secy.netdev;
4474
4475 netif_stacked_transfer_operstate(real_dev, dev);
4476 }
4477 break;
4478 case NETDEV_UNREGISTER:
4479 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4480 macsec_common_dellink(m->secy.netdev, &head);
4481 }
4482
4483 netdev_rx_handler_unregister(real_dev);
4484 kfree(rxd);
4485
4486 unregister_netdevice_many(&head);
4487 break;
4488 case NETDEV_CHANGEMTU:
4489 list_for_each_entry(m, &rxd->secys, secys) {
4490 struct net_device *dev = m->secy.netdev;
4491 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
4492 macsec_extra_len(true));
4493
4494 if (dev->mtu > mtu)
4495 dev_set_mtu(dev, mtu);
4496 }
4497 break;
4498 case NETDEV_FEAT_CHANGE:
4499 list_for_each_entry(m, &rxd->secys, secys) {
4500 macsec_inherit_tso_max(m->secy.netdev);
4501 netdev_update_features(m->secy.netdev);
4502 }
4503 break;
4504 }
4505
4506 return NOTIFY_OK;
4507 }
4508
4509 static struct notifier_block macsec_notifier = {
4510 .notifier_call = macsec_notify,
4511 };
4512
4513 static int __init macsec_init(void)
4514 {
4515 int err;
4516
4517 pr_info("MACsec IEEE 802.1AE\n");
4518 err = register_netdevice_notifier(&macsec_notifier);
4519 if (err)
4520 return err;
4521
4522 err = rtnl_link_register(&macsec_link_ops);
4523 if (err)
4524 goto notifier;
4525
4526 err = genl_register_family(&macsec_fam);
4527 if (err)
4528 goto rtnl;
4529
4530 return 0;
4531
4532 rtnl:
4533 rtnl_link_unregister(&macsec_link_ops);
4534 notifier:
4535 unregister_netdevice_notifier(&macsec_notifier);
4536 return err;
4537 }
4538
4539 static void __exit macsec_exit(void)
4540 {
4541 genl_unregister_family(&macsec_fam);
4542 rtnl_link_unregister(&macsec_link_ops);
4543 unregister_netdevice_notifier(&macsec_notifier);
4544 rcu_barrier();
4545 }
4546
4547 module_init(macsec_init);
4548 module_exit(macsec_exit);
4549
4550 MODULE_ALIAS_RTNL_LINK("macsec");
4551 MODULE_ALIAS_GENL_FAMILY("macsec");
4552
4553 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
4554 MODULE_LICENSE("GPL v2");
Kernel DRM miscellaneous fixes and cross-tree changes