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