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