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macsec: fix error message in macsec_add_rxsa and _txsa
[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 (tb_sa[MACSEC_SA_ATTR_PN] &&
1755 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1756 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
1757 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1758 rtnl_unlock();
1759 return -EINVAL;
1760 }
1761
1762 if (secy->xpn) {
1763 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
1764 rtnl_unlock();
1765 return -EINVAL;
1766 }
1767
1768 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
1769 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
1770 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
1771 MACSEC_SALT_LEN);
1772 rtnl_unlock();
1773 return -EINVAL;
1774 }
1775 }
1776
1777 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1778 if (rx_sa) {
1779 rtnl_unlock();
1780 return -EBUSY;
1781 }
1782
1783 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1784 if (!rx_sa) {
1785 rtnl_unlock();
1786 return -ENOMEM;
1787 }
1788
1789 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1790 secy->key_len, secy->icv_len);
1791 if (err < 0) {
1792 kfree(rx_sa);
1793 rtnl_unlock();
1794 return err;
1795 }
1796
1797 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1798 spin_lock_bh(&rx_sa->lock);
1799 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
1800 spin_unlock_bh(&rx_sa->lock);
1801 }
1802
1803 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1804 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1805
1806 rx_sa->sc = rx_sc;
1807
1808 /* If h/w offloading is available, propagate to the device */
1809 if (macsec_is_offloaded(netdev_priv(dev))) {
1810 const struct macsec_ops *ops;
1811 struct macsec_context ctx;
1812
1813 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1814 if (!ops) {
1815 err = -EOPNOTSUPP;
1816 goto cleanup;
1817 }
1818
1819 ctx.sa.assoc_num = assoc_num;
1820 ctx.sa.rx_sa = rx_sa;
1821 ctx.secy = secy;
1822 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1823 secy->key_len);
1824
1825 err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1826 if (err)
1827 goto cleanup;
1828 }
1829
1830 if (secy->xpn) {
1831 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
1832 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
1833 MACSEC_SALT_LEN);
1834 }
1835
1836 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1837 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1838
1839 rtnl_unlock();
1840
1841 return 0;
1842
1843 cleanup:
1844 kfree(rx_sa);
1845 rtnl_unlock();
1846 return err;
1847 }
1848
1849 static bool validate_add_rxsc(struct nlattr **attrs)
1850 {
1851 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1852 return false;
1853
1854 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1855 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1856 return false;
1857 }
1858
1859 return true;
1860 }
1861
1862 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1863 {
1864 struct net_device *dev;
1865 sci_t sci = MACSEC_UNDEF_SCI;
1866 struct nlattr **attrs = info->attrs;
1867 struct macsec_rx_sc *rx_sc;
1868 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1869 struct macsec_secy *secy;
1870 bool was_active;
1871 int ret;
1872
1873 if (!attrs[MACSEC_ATTR_IFINDEX])
1874 return -EINVAL;
1875
1876 if (parse_rxsc_config(attrs, tb_rxsc))
1877 return -EINVAL;
1878
1879 if (!validate_add_rxsc(tb_rxsc))
1880 return -EINVAL;
1881
1882 rtnl_lock();
1883 dev = get_dev_from_nl(genl_info_net(info), attrs);
1884 if (IS_ERR(dev)) {
1885 rtnl_unlock();
1886 return PTR_ERR(dev);
1887 }
1888
1889 secy = &macsec_priv(dev)->secy;
1890 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1891
1892 rx_sc = create_rx_sc(dev, sci);
1893 if (IS_ERR(rx_sc)) {
1894 rtnl_unlock();
1895 return PTR_ERR(rx_sc);
1896 }
1897
1898 was_active = rx_sc->active;
1899 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1900 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1901
1902 if (macsec_is_offloaded(netdev_priv(dev))) {
1903 const struct macsec_ops *ops;
1904 struct macsec_context ctx;
1905
1906 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1907 if (!ops) {
1908 ret = -EOPNOTSUPP;
1909 goto cleanup;
1910 }
1911
1912 ctx.rx_sc = rx_sc;
1913 ctx.secy = secy;
1914
1915 ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1916 if (ret)
1917 goto cleanup;
1918 }
1919
1920 rtnl_unlock();
1921
1922 return 0;
1923
1924 cleanup:
1925 rx_sc->active = was_active;
1926 rtnl_unlock();
1927 return ret;
1928 }
1929
1930 static bool validate_add_txsa(struct nlattr **attrs)
1931 {
1932 if (!attrs[MACSEC_SA_ATTR_AN] ||
1933 !attrs[MACSEC_SA_ATTR_PN] ||
1934 !attrs[MACSEC_SA_ATTR_KEY] ||
1935 !attrs[MACSEC_SA_ATTR_KEYID])
1936 return false;
1937
1938 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1939 return false;
1940
1941 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1942 return false;
1943
1944 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1945 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1946 return false;
1947 }
1948
1949 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1950 return false;
1951
1952 return true;
1953 }
1954
1955 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1956 {
1957 struct net_device *dev;
1958 struct nlattr **attrs = info->attrs;
1959 struct macsec_secy *secy;
1960 struct macsec_tx_sc *tx_sc;
1961 struct macsec_tx_sa *tx_sa;
1962 unsigned char assoc_num;
1963 int pn_len;
1964 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1965 bool was_operational;
1966 int err;
1967
1968 if (!attrs[MACSEC_ATTR_IFINDEX])
1969 return -EINVAL;
1970
1971 if (parse_sa_config(attrs, tb_sa))
1972 return -EINVAL;
1973
1974 if (!validate_add_txsa(tb_sa))
1975 return -EINVAL;
1976
1977 rtnl_lock();
1978 dev = get_dev_from_nl(genl_info_net(info), attrs);
1979 if (IS_ERR(dev)) {
1980 rtnl_unlock();
1981 return PTR_ERR(dev);
1982 }
1983
1984 secy = &macsec_priv(dev)->secy;
1985 tx_sc = &secy->tx_sc;
1986
1987 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1988
1989 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1990 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1991 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1992 rtnl_unlock();
1993 return -EINVAL;
1994 }
1995
1996 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1997 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1998 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
1999 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2000 rtnl_unlock();
2001 return -EINVAL;
2002 }
2003
2004 if (secy->xpn) {
2005 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
2006 rtnl_unlock();
2007 return -EINVAL;
2008 }
2009
2010 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
2011 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
2012 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
2013 MACSEC_SALT_LEN);
2014 rtnl_unlock();
2015 return -EINVAL;
2016 }
2017 }
2018
2019 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
2020 if (tx_sa) {
2021 rtnl_unlock();
2022 return -EBUSY;
2023 }
2024
2025 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
2026 if (!tx_sa) {
2027 rtnl_unlock();
2028 return -ENOMEM;
2029 }
2030
2031 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2032 secy->key_len, secy->icv_len);
2033 if (err < 0) {
2034 kfree(tx_sa);
2035 rtnl_unlock();
2036 return err;
2037 }
2038
2039 spin_lock_bh(&tx_sa->lock);
2040 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2041 spin_unlock_bh(&tx_sa->lock);
2042
2043 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2044 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2045
2046 was_operational = secy->operational;
2047 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
2048 secy->operational = true;
2049
2050 /* If h/w offloading is available, propagate to the device */
2051 if (macsec_is_offloaded(netdev_priv(dev))) {
2052 const struct macsec_ops *ops;
2053 struct macsec_context ctx;
2054
2055 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2056 if (!ops) {
2057 err = -EOPNOTSUPP;
2058 goto cleanup;
2059 }
2060
2061 ctx.sa.assoc_num = assoc_num;
2062 ctx.sa.tx_sa = tx_sa;
2063 ctx.secy = secy;
2064 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2065 secy->key_len);
2066
2067 err = macsec_offload(ops->mdo_add_txsa, &ctx);
2068 if (err)
2069 goto cleanup;
2070 }
2071
2072 if (secy->xpn) {
2073 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
2074 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
2075 MACSEC_SALT_LEN);
2076 }
2077
2078 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
2079 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
2080
2081 rtnl_unlock();
2082
2083 return 0;
2084
2085 cleanup:
2086 secy->operational = was_operational;
2087 kfree(tx_sa);
2088 rtnl_unlock();
2089 return err;
2090 }
2091
2092 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
2093 {
2094 struct nlattr **attrs = info->attrs;
2095 struct net_device *dev;
2096 struct macsec_secy *secy;
2097 struct macsec_rx_sc *rx_sc;
2098 struct macsec_rx_sa *rx_sa;
2099 u8 assoc_num;
2100 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2101 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2102 int ret;
2103
2104 if (!attrs[MACSEC_ATTR_IFINDEX])
2105 return -EINVAL;
2106
2107 if (parse_sa_config(attrs, tb_sa))
2108 return -EINVAL;
2109
2110 if (parse_rxsc_config(attrs, tb_rxsc))
2111 return -EINVAL;
2112
2113 rtnl_lock();
2114 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2115 &dev, &secy, &rx_sc, &assoc_num);
2116 if (IS_ERR(rx_sa)) {
2117 rtnl_unlock();
2118 return PTR_ERR(rx_sa);
2119 }
2120
2121 if (rx_sa->active) {
2122 rtnl_unlock();
2123 return -EBUSY;
2124 }
2125
2126 /* If h/w offloading is available, propagate to the device */
2127 if (macsec_is_offloaded(netdev_priv(dev))) {
2128 const struct macsec_ops *ops;
2129 struct macsec_context ctx;
2130
2131 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2132 if (!ops) {
2133 ret = -EOPNOTSUPP;
2134 goto cleanup;
2135 }
2136
2137 ctx.sa.assoc_num = assoc_num;
2138 ctx.sa.rx_sa = rx_sa;
2139 ctx.secy = secy;
2140
2141 ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
2142 if (ret)
2143 goto cleanup;
2144 }
2145
2146 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
2147 clear_rx_sa(rx_sa);
2148
2149 rtnl_unlock();
2150
2151 return 0;
2152
2153 cleanup:
2154 rtnl_unlock();
2155 return ret;
2156 }
2157
2158 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
2159 {
2160 struct nlattr **attrs = info->attrs;
2161 struct net_device *dev;
2162 struct macsec_secy *secy;
2163 struct macsec_rx_sc *rx_sc;
2164 sci_t sci;
2165 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2166 int ret;
2167
2168 if (!attrs[MACSEC_ATTR_IFINDEX])
2169 return -EINVAL;
2170
2171 if (parse_rxsc_config(attrs, tb_rxsc))
2172 return -EINVAL;
2173
2174 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
2175 return -EINVAL;
2176
2177 rtnl_lock();
2178 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2179 if (IS_ERR(dev)) {
2180 rtnl_unlock();
2181 return PTR_ERR(dev);
2182 }
2183
2184 secy = &macsec_priv(dev)->secy;
2185 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2186
2187 rx_sc = del_rx_sc(secy, sci);
2188 if (!rx_sc) {
2189 rtnl_unlock();
2190 return -ENODEV;
2191 }
2192
2193 /* If h/w offloading is available, propagate to the device */
2194 if (macsec_is_offloaded(netdev_priv(dev))) {
2195 const struct macsec_ops *ops;
2196 struct macsec_context ctx;
2197
2198 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2199 if (!ops) {
2200 ret = -EOPNOTSUPP;
2201 goto cleanup;
2202 }
2203
2204 ctx.rx_sc = rx_sc;
2205 ctx.secy = secy;
2206 ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2207 if (ret)
2208 goto cleanup;
2209 }
2210
2211 free_rx_sc(rx_sc);
2212 rtnl_unlock();
2213
2214 return 0;
2215
2216 cleanup:
2217 rtnl_unlock();
2218 return ret;
2219 }
2220
2221 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2222 {
2223 struct nlattr **attrs = info->attrs;
2224 struct net_device *dev;
2225 struct macsec_secy *secy;
2226 struct macsec_tx_sc *tx_sc;
2227 struct macsec_tx_sa *tx_sa;
2228 u8 assoc_num;
2229 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2230 int ret;
2231
2232 if (!attrs[MACSEC_ATTR_IFINDEX])
2233 return -EINVAL;
2234
2235 if (parse_sa_config(attrs, tb_sa))
2236 return -EINVAL;
2237
2238 rtnl_lock();
2239 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2240 &dev, &secy, &tx_sc, &assoc_num);
2241 if (IS_ERR(tx_sa)) {
2242 rtnl_unlock();
2243 return PTR_ERR(tx_sa);
2244 }
2245
2246 if (tx_sa->active) {
2247 rtnl_unlock();
2248 return -EBUSY;
2249 }
2250
2251 /* If h/w offloading is available, propagate to the device */
2252 if (macsec_is_offloaded(netdev_priv(dev))) {
2253 const struct macsec_ops *ops;
2254 struct macsec_context ctx;
2255
2256 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2257 if (!ops) {
2258 ret = -EOPNOTSUPP;
2259 goto cleanup;
2260 }
2261
2262 ctx.sa.assoc_num = assoc_num;
2263 ctx.sa.tx_sa = tx_sa;
2264 ctx.secy = secy;
2265
2266 ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2267 if (ret)
2268 goto cleanup;
2269 }
2270
2271 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2272 clear_tx_sa(tx_sa);
2273
2274 rtnl_unlock();
2275
2276 return 0;
2277
2278 cleanup:
2279 rtnl_unlock();
2280 return ret;
2281 }
2282
2283 static bool validate_upd_sa(struct nlattr **attrs)
2284 {
2285 if (!attrs[MACSEC_SA_ATTR_AN] ||
2286 attrs[MACSEC_SA_ATTR_KEY] ||
2287 attrs[MACSEC_SA_ATTR_KEYID] ||
2288 attrs[MACSEC_SA_ATTR_SSCI] ||
2289 attrs[MACSEC_SA_ATTR_SALT])
2290 return false;
2291
2292 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2293 return false;
2294
2295 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
2296 return false;
2297
2298 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2299 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2300 return false;
2301 }
2302
2303 return true;
2304 }
2305
2306 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2307 {
2308 struct nlattr **attrs = info->attrs;
2309 struct net_device *dev;
2310 struct macsec_secy *secy;
2311 struct macsec_tx_sc *tx_sc;
2312 struct macsec_tx_sa *tx_sa;
2313 u8 assoc_num;
2314 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2315 bool was_operational, was_active;
2316 pn_t prev_pn;
2317 int ret = 0;
2318
2319 prev_pn.full64 = 0;
2320
2321 if (!attrs[MACSEC_ATTR_IFINDEX])
2322 return -EINVAL;
2323
2324 if (parse_sa_config(attrs, tb_sa))
2325 return -EINVAL;
2326
2327 if (!validate_upd_sa(tb_sa))
2328 return -EINVAL;
2329
2330 rtnl_lock();
2331 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2332 &dev, &secy, &tx_sc, &assoc_num);
2333 if (IS_ERR(tx_sa)) {
2334 rtnl_unlock();
2335 return PTR_ERR(tx_sa);
2336 }
2337
2338 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2339 int pn_len;
2340
2341 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2342 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2343 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
2344 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2345 rtnl_unlock();
2346 return -EINVAL;
2347 }
2348
2349 spin_lock_bh(&tx_sa->lock);
2350 prev_pn = tx_sa->next_pn_halves;
2351 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2352 spin_unlock_bh(&tx_sa->lock);
2353 }
2354
2355 was_active = tx_sa->active;
2356 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2357 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2358
2359 was_operational = secy->operational;
2360 if (assoc_num == tx_sc->encoding_sa)
2361 secy->operational = tx_sa->active;
2362
2363 /* If h/w offloading is available, propagate to the device */
2364 if (macsec_is_offloaded(netdev_priv(dev))) {
2365 const struct macsec_ops *ops;
2366 struct macsec_context ctx;
2367
2368 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2369 if (!ops) {
2370 ret = -EOPNOTSUPP;
2371 goto cleanup;
2372 }
2373
2374 ctx.sa.assoc_num = assoc_num;
2375 ctx.sa.tx_sa = tx_sa;
2376 ctx.secy = secy;
2377
2378 ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
2379 if (ret)
2380 goto cleanup;
2381 }
2382
2383 rtnl_unlock();
2384
2385 return 0;
2386
2387 cleanup:
2388 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2389 spin_lock_bh(&tx_sa->lock);
2390 tx_sa->next_pn_halves = prev_pn;
2391 spin_unlock_bh(&tx_sa->lock);
2392 }
2393 tx_sa->active = was_active;
2394 secy->operational = was_operational;
2395 rtnl_unlock();
2396 return ret;
2397 }
2398
2399 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2400 {
2401 struct nlattr **attrs = info->attrs;
2402 struct net_device *dev;
2403 struct macsec_secy *secy;
2404 struct macsec_rx_sc *rx_sc;
2405 struct macsec_rx_sa *rx_sa;
2406 u8 assoc_num;
2407 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2408 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2409 bool was_active;
2410 pn_t prev_pn;
2411 int ret = 0;
2412
2413 prev_pn.full64 = 0;
2414
2415 if (!attrs[MACSEC_ATTR_IFINDEX])
2416 return -EINVAL;
2417
2418 if (parse_rxsc_config(attrs, tb_rxsc))
2419 return -EINVAL;
2420
2421 if (parse_sa_config(attrs, tb_sa))
2422 return -EINVAL;
2423
2424 if (!validate_upd_sa(tb_sa))
2425 return -EINVAL;
2426
2427 rtnl_lock();
2428 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2429 &dev, &secy, &rx_sc, &assoc_num);
2430 if (IS_ERR(rx_sa)) {
2431 rtnl_unlock();
2432 return PTR_ERR(rx_sa);
2433 }
2434
2435 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2436 int pn_len;
2437
2438 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2439 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2440 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
2441 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2442 rtnl_unlock();
2443 return -EINVAL;
2444 }
2445
2446 spin_lock_bh(&rx_sa->lock);
2447 prev_pn = rx_sa->next_pn_halves;
2448 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2449 spin_unlock_bh(&rx_sa->lock);
2450 }
2451
2452 was_active = rx_sa->active;
2453 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2454 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2455
2456 /* If h/w offloading is available, propagate to the device */
2457 if (macsec_is_offloaded(netdev_priv(dev))) {
2458 const struct macsec_ops *ops;
2459 struct macsec_context ctx;
2460
2461 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2462 if (!ops) {
2463 ret = -EOPNOTSUPP;
2464 goto cleanup;
2465 }
2466
2467 ctx.sa.assoc_num = assoc_num;
2468 ctx.sa.rx_sa = rx_sa;
2469 ctx.secy = secy;
2470
2471 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2472 if (ret)
2473 goto cleanup;
2474 }
2475
2476 rtnl_unlock();
2477 return 0;
2478
2479 cleanup:
2480 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2481 spin_lock_bh(&rx_sa->lock);
2482 rx_sa->next_pn_halves = prev_pn;
2483 spin_unlock_bh(&rx_sa->lock);
2484 }
2485 rx_sa->active = was_active;
2486 rtnl_unlock();
2487 return ret;
2488 }
2489
2490 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2491 {
2492 struct nlattr **attrs = info->attrs;
2493 struct net_device *dev;
2494 struct macsec_secy *secy;
2495 struct macsec_rx_sc *rx_sc;
2496 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2497 unsigned int prev_n_rx_sc;
2498 bool was_active;
2499 int ret;
2500
2501 if (!attrs[MACSEC_ATTR_IFINDEX])
2502 return -EINVAL;
2503
2504 if (parse_rxsc_config(attrs, tb_rxsc))
2505 return -EINVAL;
2506
2507 if (!validate_add_rxsc(tb_rxsc))
2508 return -EINVAL;
2509
2510 rtnl_lock();
2511 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2512 if (IS_ERR(rx_sc)) {
2513 rtnl_unlock();
2514 return PTR_ERR(rx_sc);
2515 }
2516
2517 was_active = rx_sc->active;
2518 prev_n_rx_sc = secy->n_rx_sc;
2519 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2520 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2521
2522 if (rx_sc->active != new)
2523 secy->n_rx_sc += new ? 1 : -1;
2524
2525 rx_sc->active = new;
2526 }
2527
2528 /* If h/w offloading is available, propagate to the device */
2529 if (macsec_is_offloaded(netdev_priv(dev))) {
2530 const struct macsec_ops *ops;
2531 struct macsec_context ctx;
2532
2533 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2534 if (!ops) {
2535 ret = -EOPNOTSUPP;
2536 goto cleanup;
2537 }
2538
2539 ctx.rx_sc = rx_sc;
2540 ctx.secy = secy;
2541
2542 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2543 if (ret)
2544 goto cleanup;
2545 }
2546
2547 rtnl_unlock();
2548
2549 return 0;
2550
2551 cleanup:
2552 secy->n_rx_sc = prev_n_rx_sc;
2553 rx_sc->active = was_active;
2554 rtnl_unlock();
2555 return ret;
2556 }
2557
2558 static bool macsec_is_configured(struct macsec_dev *macsec)
2559 {
2560 struct macsec_secy *secy = &macsec->secy;
2561 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2562 int i;
2563
2564 if (secy->n_rx_sc > 0)
2565 return true;
2566
2567 for (i = 0; i < MACSEC_NUM_AN; i++)
2568 if (tx_sc->sa[i])
2569 return true;
2570
2571 return false;
2572 }
2573
2574 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2575 {
2576 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2577 enum macsec_offload offload, prev_offload;
2578 int (*func)(struct macsec_context *ctx);
2579 struct nlattr **attrs = info->attrs;
2580 struct net_device *dev;
2581 const struct macsec_ops *ops;
2582 struct macsec_context ctx;
2583 struct macsec_dev *macsec;
2584 int ret;
2585
2586 if (!attrs[MACSEC_ATTR_IFINDEX])
2587 return -EINVAL;
2588
2589 if (!attrs[MACSEC_ATTR_OFFLOAD])
2590 return -EINVAL;
2591
2592 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2593 attrs[MACSEC_ATTR_OFFLOAD],
2594 macsec_genl_offload_policy, NULL))
2595 return -EINVAL;
2596
2597 dev = get_dev_from_nl(genl_info_net(info), attrs);
2598 if (IS_ERR(dev))
2599 return PTR_ERR(dev);
2600 macsec = macsec_priv(dev);
2601
2602 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE])
2603 return -EINVAL;
2604
2605 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2606 if (macsec->offload == offload)
2607 return 0;
2608
2609 /* Check if the offloading mode is supported by the underlying layers */
2610 if (offload != MACSEC_OFFLOAD_OFF &&
2611 !macsec_check_offload(offload, macsec))
2612 return -EOPNOTSUPP;
2613
2614 /* Check if the net device is busy. */
2615 if (netif_running(dev))
2616 return -EBUSY;
2617
2618 rtnl_lock();
2619
2620 prev_offload = macsec->offload;
2621 macsec->offload = offload;
2622
2623 /* Check if the device already has rules configured: we do not support
2624 * rules migration.
2625 */
2626 if (macsec_is_configured(macsec)) {
2627 ret = -EBUSY;
2628 goto rollback;
2629 }
2630
2631 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2632 macsec, &ctx);
2633 if (!ops) {
2634 ret = -EOPNOTSUPP;
2635 goto rollback;
2636 }
2637
2638 if (prev_offload == MACSEC_OFFLOAD_OFF)
2639 func = ops->mdo_add_secy;
2640 else
2641 func = ops->mdo_del_secy;
2642
2643 ctx.secy = &macsec->secy;
2644 ret = macsec_offload(func, &ctx);
2645 if (ret)
2646 goto rollback;
2647
2648 /* Force features update, since they are different for SW MACSec and
2649 * HW offloading cases.
2650 */
2651 netdev_update_features(dev);
2652
2653 rtnl_unlock();
2654 return 0;
2655
2656 rollback:
2657 macsec->offload = prev_offload;
2658
2659 rtnl_unlock();
2660 return ret;
2661 }
2662
2663 static void get_tx_sa_stats(struct net_device *dev, int an,
2664 struct macsec_tx_sa *tx_sa,
2665 struct macsec_tx_sa_stats *sum)
2666 {
2667 struct macsec_dev *macsec = macsec_priv(dev);
2668 int cpu;
2669
2670 /* If h/w offloading is available, propagate to the device */
2671 if (macsec_is_offloaded(macsec)) {
2672 const struct macsec_ops *ops;
2673 struct macsec_context ctx;
2674
2675 ops = macsec_get_ops(macsec, &ctx);
2676 if (ops) {
2677 ctx.sa.assoc_num = an;
2678 ctx.sa.tx_sa = tx_sa;
2679 ctx.stats.tx_sa_stats = sum;
2680 ctx.secy = &macsec_priv(dev)->secy;
2681 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
2682 }
2683 return;
2684 }
2685
2686 for_each_possible_cpu(cpu) {
2687 const struct macsec_tx_sa_stats *stats =
2688 per_cpu_ptr(tx_sa->stats, cpu);
2689
2690 sum->OutPktsProtected += stats->OutPktsProtected;
2691 sum->OutPktsEncrypted += stats->OutPktsEncrypted;
2692 }
2693 }
2694
2695 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
2696 {
2697 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
2698 sum->OutPktsProtected) ||
2699 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2700 sum->OutPktsEncrypted))
2701 return -EMSGSIZE;
2702
2703 return 0;
2704 }
2705
2706 static void get_rx_sa_stats(struct net_device *dev,
2707 struct macsec_rx_sc *rx_sc, int an,
2708 struct macsec_rx_sa *rx_sa,
2709 struct macsec_rx_sa_stats *sum)
2710 {
2711 struct macsec_dev *macsec = macsec_priv(dev);
2712 int cpu;
2713
2714 /* If h/w offloading is available, propagate to the device */
2715 if (macsec_is_offloaded(macsec)) {
2716 const struct macsec_ops *ops;
2717 struct macsec_context ctx;
2718
2719 ops = macsec_get_ops(macsec, &ctx);
2720 if (ops) {
2721 ctx.sa.assoc_num = an;
2722 ctx.sa.rx_sa = rx_sa;
2723 ctx.stats.rx_sa_stats = sum;
2724 ctx.secy = &macsec_priv(dev)->secy;
2725 ctx.rx_sc = rx_sc;
2726 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
2727 }
2728 return;
2729 }
2730
2731 for_each_possible_cpu(cpu) {
2732 const struct macsec_rx_sa_stats *stats =
2733 per_cpu_ptr(rx_sa->stats, cpu);
2734
2735 sum->InPktsOK += stats->InPktsOK;
2736 sum->InPktsInvalid += stats->InPktsInvalid;
2737 sum->InPktsNotValid += stats->InPktsNotValid;
2738 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
2739 sum->InPktsUnusedSA += stats->InPktsUnusedSA;
2740 }
2741 }
2742
2743 static int copy_rx_sa_stats(struct sk_buff *skb,
2744 struct macsec_rx_sa_stats *sum)
2745 {
2746 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
2747 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
2748 sum->InPktsInvalid) ||
2749 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
2750 sum->InPktsNotValid) ||
2751 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2752 sum->InPktsNotUsingSA) ||
2753 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
2754 sum->InPktsUnusedSA))
2755 return -EMSGSIZE;
2756
2757 return 0;
2758 }
2759
2760 static void get_rx_sc_stats(struct net_device *dev,
2761 struct macsec_rx_sc *rx_sc,
2762 struct macsec_rx_sc_stats *sum)
2763 {
2764 struct macsec_dev *macsec = macsec_priv(dev);
2765 int cpu;
2766
2767 /* If h/w offloading is available, propagate to the device */
2768 if (macsec_is_offloaded(macsec)) {
2769 const struct macsec_ops *ops;
2770 struct macsec_context ctx;
2771
2772 ops = macsec_get_ops(macsec, &ctx);
2773 if (ops) {
2774 ctx.stats.rx_sc_stats = sum;
2775 ctx.secy = &macsec_priv(dev)->secy;
2776 ctx.rx_sc = rx_sc;
2777 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
2778 }
2779 return;
2780 }
2781
2782 for_each_possible_cpu(cpu) {
2783 const struct pcpu_rx_sc_stats *stats;
2784 struct macsec_rx_sc_stats tmp;
2785 unsigned int start;
2786
2787 stats = per_cpu_ptr(rx_sc->stats, cpu);
2788 do {
2789 start = u64_stats_fetch_begin_irq(&stats->syncp);
2790 memcpy(&tmp, &stats->stats, sizeof(tmp));
2791 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2792
2793 sum->InOctetsValidated += tmp.InOctetsValidated;
2794 sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
2795 sum->InPktsUnchecked += tmp.InPktsUnchecked;
2796 sum->InPktsDelayed += tmp.InPktsDelayed;
2797 sum->InPktsOK += tmp.InPktsOK;
2798 sum->InPktsInvalid += tmp.InPktsInvalid;
2799 sum->InPktsLate += tmp.InPktsLate;
2800 sum->InPktsNotValid += tmp.InPktsNotValid;
2801 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2802 sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
2803 }
2804 }
2805
2806 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
2807 {
2808 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2809 sum->InOctetsValidated,
2810 MACSEC_RXSC_STATS_ATTR_PAD) ||
2811 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2812 sum->InOctetsDecrypted,
2813 MACSEC_RXSC_STATS_ATTR_PAD) ||
2814 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2815 sum->InPktsUnchecked,
2816 MACSEC_RXSC_STATS_ATTR_PAD) ||
2817 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2818 sum->InPktsDelayed,
2819 MACSEC_RXSC_STATS_ATTR_PAD) ||
2820 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2821 sum->InPktsOK,
2822 MACSEC_RXSC_STATS_ATTR_PAD) ||
2823 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2824 sum->InPktsInvalid,
2825 MACSEC_RXSC_STATS_ATTR_PAD) ||
2826 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2827 sum->InPktsLate,
2828 MACSEC_RXSC_STATS_ATTR_PAD) ||
2829 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2830 sum->InPktsNotValid,
2831 MACSEC_RXSC_STATS_ATTR_PAD) ||
2832 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2833 sum->InPktsNotUsingSA,
2834 MACSEC_RXSC_STATS_ATTR_PAD) ||
2835 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2836 sum->InPktsUnusedSA,
2837 MACSEC_RXSC_STATS_ATTR_PAD))
2838 return -EMSGSIZE;
2839
2840 return 0;
2841 }
2842
2843 static void get_tx_sc_stats(struct net_device *dev,
2844 struct macsec_tx_sc_stats *sum)
2845 {
2846 struct macsec_dev *macsec = macsec_priv(dev);
2847 int cpu;
2848
2849 /* If h/w offloading is available, propagate to the device */
2850 if (macsec_is_offloaded(macsec)) {
2851 const struct macsec_ops *ops;
2852 struct macsec_context ctx;
2853
2854 ops = macsec_get_ops(macsec, &ctx);
2855 if (ops) {
2856 ctx.stats.tx_sc_stats = sum;
2857 ctx.secy = &macsec_priv(dev)->secy;
2858 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
2859 }
2860 return;
2861 }
2862
2863 for_each_possible_cpu(cpu) {
2864 const struct pcpu_tx_sc_stats *stats;
2865 struct macsec_tx_sc_stats tmp;
2866 unsigned int start;
2867
2868 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
2869 do {
2870 start = u64_stats_fetch_begin_irq(&stats->syncp);
2871 memcpy(&tmp, &stats->stats, sizeof(tmp));
2872 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2873
2874 sum->OutPktsProtected += tmp.OutPktsProtected;
2875 sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
2876 sum->OutOctetsProtected += tmp.OutOctetsProtected;
2877 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2878 }
2879 }
2880
2881 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
2882 {
2883 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2884 sum->OutPktsProtected,
2885 MACSEC_TXSC_STATS_ATTR_PAD) ||
2886 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2887 sum->OutPktsEncrypted,
2888 MACSEC_TXSC_STATS_ATTR_PAD) ||
2889 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2890 sum->OutOctetsProtected,
2891 MACSEC_TXSC_STATS_ATTR_PAD) ||
2892 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2893 sum->OutOctetsEncrypted,
2894 MACSEC_TXSC_STATS_ATTR_PAD))
2895 return -EMSGSIZE;
2896
2897 return 0;
2898 }
2899
2900 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
2901 {
2902 struct macsec_dev *macsec = macsec_priv(dev);
2903 int cpu;
2904
2905 /* If h/w offloading is available, propagate to the device */
2906 if (macsec_is_offloaded(macsec)) {
2907 const struct macsec_ops *ops;
2908 struct macsec_context ctx;
2909
2910 ops = macsec_get_ops(macsec, &ctx);
2911 if (ops) {
2912 ctx.stats.dev_stats = sum;
2913 ctx.secy = &macsec_priv(dev)->secy;
2914 macsec_offload(ops->mdo_get_dev_stats, &ctx);
2915 }
2916 return;
2917 }
2918
2919 for_each_possible_cpu(cpu) {
2920 const struct pcpu_secy_stats *stats;
2921 struct macsec_dev_stats tmp;
2922 unsigned int start;
2923
2924 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
2925 do {
2926 start = u64_stats_fetch_begin_irq(&stats->syncp);
2927 memcpy(&tmp, &stats->stats, sizeof(tmp));
2928 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2929
2930 sum->OutPktsUntagged += tmp.OutPktsUntagged;
2931 sum->InPktsUntagged += tmp.InPktsUntagged;
2932 sum->OutPktsTooLong += tmp.OutPktsTooLong;
2933 sum->InPktsNoTag += tmp.InPktsNoTag;
2934 sum->InPktsBadTag += tmp.InPktsBadTag;
2935 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2936 sum->InPktsNoSCI += tmp.InPktsNoSCI;
2937 sum->InPktsOverrun += tmp.InPktsOverrun;
2938 }
2939 }
2940
2941 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
2942 {
2943 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2944 sum->OutPktsUntagged,
2945 MACSEC_SECY_STATS_ATTR_PAD) ||
2946 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2947 sum->InPktsUntagged,
2948 MACSEC_SECY_STATS_ATTR_PAD) ||
2949 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2950 sum->OutPktsTooLong,
2951 MACSEC_SECY_STATS_ATTR_PAD) ||
2952 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2953 sum->InPktsNoTag,
2954 MACSEC_SECY_STATS_ATTR_PAD) ||
2955 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2956 sum->InPktsBadTag,
2957 MACSEC_SECY_STATS_ATTR_PAD) ||
2958 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2959 sum->InPktsUnknownSCI,
2960 MACSEC_SECY_STATS_ATTR_PAD) ||
2961 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2962 sum->InPktsNoSCI,
2963 MACSEC_SECY_STATS_ATTR_PAD) ||
2964 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2965 sum->InPktsOverrun,
2966 MACSEC_SECY_STATS_ATTR_PAD))
2967 return -EMSGSIZE;
2968
2969 return 0;
2970 }
2971
2972 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2973 {
2974 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2975 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
2976 MACSEC_ATTR_SECY);
2977 u64 csid;
2978
2979 if (!secy_nest)
2980 return 1;
2981
2982 switch (secy->key_len) {
2983 case MACSEC_GCM_AES_128_SAK_LEN:
2984 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
2985 break;
2986 case MACSEC_GCM_AES_256_SAK_LEN:
2987 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
2988 break;
2989 default:
2990 goto cancel;
2991 }
2992
2993 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2994 MACSEC_SECY_ATTR_PAD) ||
2995 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2996 csid, MACSEC_SECY_ATTR_PAD) ||
2997 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2998 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2999 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
3000 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
3001 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
3002 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
3003 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
3004 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
3005 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
3006 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
3007 goto cancel;
3008
3009 if (secy->replay_protect) {
3010 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
3011 goto cancel;
3012 }
3013
3014 nla_nest_end(skb, secy_nest);
3015 return 0;
3016
3017 cancel:
3018 nla_nest_cancel(skb, secy_nest);
3019 return 1;
3020 }
3021
3022 static noinline_for_stack int
3023 dump_secy(struct macsec_secy *secy, struct net_device *dev,
3024 struct sk_buff *skb, struct netlink_callback *cb)
3025 {
3026 struct macsec_tx_sc_stats tx_sc_stats = {0, };
3027 struct macsec_tx_sa_stats tx_sa_stats = {0, };
3028 struct macsec_rx_sc_stats rx_sc_stats = {0, };
3029 struct macsec_rx_sa_stats rx_sa_stats = {0, };
3030 struct macsec_dev *macsec = netdev_priv(dev);
3031 struct macsec_dev_stats dev_stats = {0, };
3032 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3033 struct nlattr *txsa_list, *rxsc_list;
3034 struct macsec_rx_sc *rx_sc;
3035 struct nlattr *attr;
3036 void *hdr;
3037 int i, j;
3038
3039 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3040 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
3041 if (!hdr)
3042 return -EMSGSIZE;
3043
3044 genl_dump_check_consistent(cb, hdr);
3045
3046 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
3047 goto nla_put_failure;
3048
3049 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
3050 if (!attr)
3051 goto nla_put_failure;
3052 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
3053 goto nla_put_failure;
3054 nla_nest_end(skb, attr);
3055
3056 if (nla_put_secy(secy, skb))
3057 goto nla_put_failure;
3058
3059 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
3060 if (!attr)
3061 goto nla_put_failure;
3062
3063 get_tx_sc_stats(dev, &tx_sc_stats);
3064 if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
3065 nla_nest_cancel(skb, attr);
3066 goto nla_put_failure;
3067 }
3068 nla_nest_end(skb, attr);
3069
3070 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
3071 if (!attr)
3072 goto nla_put_failure;
3073 get_secy_stats(dev, &dev_stats);
3074 if (copy_secy_stats(skb, &dev_stats)) {
3075 nla_nest_cancel(skb, attr);
3076 goto nla_put_failure;
3077 }
3078 nla_nest_end(skb, attr);
3079
3080 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
3081 if (!txsa_list)
3082 goto nla_put_failure;
3083 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
3084 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
3085 struct nlattr *txsa_nest;
3086 u64 pn;
3087 int pn_len;
3088
3089 if (!tx_sa)
3090 continue;
3091
3092 txsa_nest = nla_nest_start_noflag(skb, j++);
3093 if (!txsa_nest) {
3094 nla_nest_cancel(skb, txsa_list);
3095 goto nla_put_failure;
3096 }
3097
3098 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
3099 if (!attr) {
3100 nla_nest_cancel(skb, txsa_nest);
3101 nla_nest_cancel(skb, txsa_list);
3102 goto nla_put_failure;
3103 }
3104 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
3105 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
3106 if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
3107 nla_nest_cancel(skb, attr);
3108 nla_nest_cancel(skb, txsa_nest);
3109 nla_nest_cancel(skb, txsa_list);
3110 goto nla_put_failure;
3111 }
3112 nla_nest_end(skb, attr);
3113
3114 if (secy->xpn) {
3115 pn = tx_sa->next_pn;
3116 pn_len = MACSEC_XPN_PN_LEN;
3117 } else {
3118 pn = tx_sa->next_pn_halves.lower;
3119 pn_len = MACSEC_DEFAULT_PN_LEN;
3120 }
3121
3122 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3123 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3124 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
3125 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
3126 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
3127 nla_nest_cancel(skb, txsa_nest);
3128 nla_nest_cancel(skb, txsa_list);
3129 goto nla_put_failure;
3130 }
3131
3132 nla_nest_end(skb, txsa_nest);
3133 }
3134 nla_nest_end(skb, txsa_list);
3135
3136 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
3137 if (!rxsc_list)
3138 goto nla_put_failure;
3139
3140 j = 1;
3141 for_each_rxsc_rtnl(secy, rx_sc) {
3142 int k;
3143 struct nlattr *rxsa_list;
3144 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
3145
3146 if (!rxsc_nest) {
3147 nla_nest_cancel(skb, rxsc_list);
3148 goto nla_put_failure;
3149 }
3150
3151 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
3152 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
3153 MACSEC_RXSC_ATTR_PAD)) {
3154 nla_nest_cancel(skb, rxsc_nest);
3155 nla_nest_cancel(skb, rxsc_list);
3156 goto nla_put_failure;
3157 }
3158
3159 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
3160 if (!attr) {
3161 nla_nest_cancel(skb, rxsc_nest);
3162 nla_nest_cancel(skb, rxsc_list);
3163 goto nla_put_failure;
3164 }
3165 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
3166 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
3167 if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
3168 nla_nest_cancel(skb, attr);
3169 nla_nest_cancel(skb, rxsc_nest);
3170 nla_nest_cancel(skb, rxsc_list);
3171 goto nla_put_failure;
3172 }
3173 nla_nest_end(skb, attr);
3174
3175 rxsa_list = nla_nest_start_noflag(skb,
3176 MACSEC_RXSC_ATTR_SA_LIST);
3177 if (!rxsa_list) {
3178 nla_nest_cancel(skb, rxsc_nest);
3179 nla_nest_cancel(skb, rxsc_list);
3180 goto nla_put_failure;
3181 }
3182
3183 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
3184 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
3185 struct nlattr *rxsa_nest;
3186 u64 pn;
3187 int pn_len;
3188
3189 if (!rx_sa)
3190 continue;
3191
3192 rxsa_nest = nla_nest_start_noflag(skb, k++);
3193 if (!rxsa_nest) {
3194 nla_nest_cancel(skb, rxsa_list);
3195 nla_nest_cancel(skb, rxsc_nest);
3196 nla_nest_cancel(skb, rxsc_list);
3197 goto nla_put_failure;
3198 }
3199
3200 attr = nla_nest_start_noflag(skb,
3201 MACSEC_SA_ATTR_STATS);
3202 if (!attr) {
3203 nla_nest_cancel(skb, rxsa_list);
3204 nla_nest_cancel(skb, rxsc_nest);
3205 nla_nest_cancel(skb, rxsc_list);
3206 goto nla_put_failure;
3207 }
3208 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
3209 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
3210 if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
3211 nla_nest_cancel(skb, attr);
3212 nla_nest_cancel(skb, rxsa_list);
3213 nla_nest_cancel(skb, rxsc_nest);
3214 nla_nest_cancel(skb, rxsc_list);
3215 goto nla_put_failure;
3216 }
3217 nla_nest_end(skb, attr);
3218
3219 if (secy->xpn) {
3220 pn = rx_sa->next_pn;
3221 pn_len = MACSEC_XPN_PN_LEN;
3222 } else {
3223 pn = rx_sa->next_pn_halves.lower;
3224 pn_len = MACSEC_DEFAULT_PN_LEN;
3225 }
3226
3227 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3228 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3229 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
3230 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
3231 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
3232 nla_nest_cancel(skb, rxsa_nest);
3233 nla_nest_cancel(skb, rxsc_nest);
3234 nla_nest_cancel(skb, rxsc_list);
3235 goto nla_put_failure;
3236 }
3237 nla_nest_end(skb, rxsa_nest);
3238 }
3239
3240 nla_nest_end(skb, rxsa_list);
3241 nla_nest_end(skb, rxsc_nest);
3242 }
3243
3244 nla_nest_end(skb, rxsc_list);
3245
3246 genlmsg_end(skb, hdr);
3247
3248 return 0;
3249
3250 nla_put_failure:
3251 genlmsg_cancel(skb, hdr);
3252 return -EMSGSIZE;
3253 }
3254
3255 static int macsec_generation = 1; /* protected by RTNL */
3256
3257 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
3258 {
3259 struct net *net = sock_net(skb->sk);
3260 struct net_device *dev;
3261 int dev_idx, d;
3262
3263 dev_idx = cb->args[0];
3264
3265 d = 0;
3266 rtnl_lock();
3267
3268 cb->seq = macsec_generation;
3269
3270 for_each_netdev(net, dev) {
3271 struct macsec_secy *secy;
3272
3273 if (d < dev_idx)
3274 goto next;
3275
3276 if (!netif_is_macsec(dev))
3277 goto next;
3278
3279 secy = &macsec_priv(dev)->secy;
3280 if (dump_secy(secy, dev, skb, cb) < 0)
3281 goto done;
3282 next:
3283 d++;
3284 }
3285
3286 done:
3287 rtnl_unlock();
3288 cb->args[0] = d;
3289 return skb->len;
3290 }
3291
3292 static const struct genl_small_ops macsec_genl_ops[] = {
3293 {
3294 .cmd = MACSEC_CMD_GET_TXSC,
3295 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3296 .dumpit = macsec_dump_txsc,
3297 },
3298 {
3299 .cmd = MACSEC_CMD_ADD_RXSC,
3300 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3301 .doit = macsec_add_rxsc,
3302 .flags = GENL_ADMIN_PERM,
3303 },
3304 {
3305 .cmd = MACSEC_CMD_DEL_RXSC,
3306 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3307 .doit = macsec_del_rxsc,
3308 .flags = GENL_ADMIN_PERM,
3309 },
3310 {
3311 .cmd = MACSEC_CMD_UPD_RXSC,
3312 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3313 .doit = macsec_upd_rxsc,
3314 .flags = GENL_ADMIN_PERM,
3315 },
3316 {
3317 .cmd = MACSEC_CMD_ADD_TXSA,
3318 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3319 .doit = macsec_add_txsa,
3320 .flags = GENL_ADMIN_PERM,
3321 },
3322 {
3323 .cmd = MACSEC_CMD_DEL_TXSA,
3324 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3325 .doit = macsec_del_txsa,
3326 .flags = GENL_ADMIN_PERM,
3327 },
3328 {
3329 .cmd = MACSEC_CMD_UPD_TXSA,
3330 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3331 .doit = macsec_upd_txsa,
3332 .flags = GENL_ADMIN_PERM,
3333 },
3334 {
3335 .cmd = MACSEC_CMD_ADD_RXSA,
3336 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3337 .doit = macsec_add_rxsa,
3338 .flags = GENL_ADMIN_PERM,
3339 },
3340 {
3341 .cmd = MACSEC_CMD_DEL_RXSA,
3342 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3343 .doit = macsec_del_rxsa,
3344 .flags = GENL_ADMIN_PERM,
3345 },
3346 {
3347 .cmd = MACSEC_CMD_UPD_RXSA,
3348 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3349 .doit = macsec_upd_rxsa,
3350 .flags = GENL_ADMIN_PERM,
3351 },
3352 {
3353 .cmd = MACSEC_CMD_UPD_OFFLOAD,
3354 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3355 .doit = macsec_upd_offload,
3356 .flags = GENL_ADMIN_PERM,
3357 },
3358 };
3359
3360 static struct genl_family macsec_fam __ro_after_init = {
3361 .name = MACSEC_GENL_NAME,
3362 .hdrsize = 0,
3363 .version = MACSEC_GENL_VERSION,
3364 .maxattr = MACSEC_ATTR_MAX,
3365 .policy = macsec_genl_policy,
3366 .netnsok = true,
3367 .module = THIS_MODULE,
3368 .small_ops = macsec_genl_ops,
3369 .n_small_ops = ARRAY_SIZE(macsec_genl_ops),
3370 };
3371
3372 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3373 struct net_device *dev)
3374 {
3375 struct macsec_dev *macsec = netdev_priv(dev);
3376 struct macsec_secy *secy = &macsec->secy;
3377 struct pcpu_secy_stats *secy_stats;
3378 int ret, len;
3379
3380 if (macsec_is_offloaded(netdev_priv(dev))) {
3381 skb->dev = macsec->real_dev;
3382 return dev_queue_xmit(skb);
3383 }
3384
3385 /* 10.5 */
3386 if (!secy->protect_frames) {
3387 secy_stats = this_cpu_ptr(macsec->stats);
3388 u64_stats_update_begin(&secy_stats->syncp);
3389 secy_stats->stats.OutPktsUntagged++;
3390 u64_stats_update_end(&secy_stats->syncp);
3391 skb->dev = macsec->real_dev;
3392 len = skb->len;
3393 ret = dev_queue_xmit(skb);
3394 count_tx(dev, ret, len);
3395 return ret;
3396 }
3397
3398 if (!secy->operational) {
3399 kfree_skb(skb);
3400 dev->stats.tx_dropped++;
3401 return NETDEV_TX_OK;
3402 }
3403
3404 skb = macsec_encrypt(skb, dev);
3405 if (IS_ERR(skb)) {
3406 if (PTR_ERR(skb) != -EINPROGRESS)
3407 dev->stats.tx_dropped++;
3408 return NETDEV_TX_OK;
3409 }
3410
3411 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3412
3413 macsec_encrypt_finish(skb, dev);
3414 len = skb->len;
3415 ret = dev_queue_xmit(skb);
3416 count_tx(dev, ret, len);
3417 return ret;
3418 }
3419
3420 #define SW_MACSEC_FEATURES \
3421 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3422
3423 /* If h/w offloading is enabled, use real device features save for
3424 * VLAN_FEATURES - they require additional ops
3425 * HW_MACSEC - no reason to report it
3426 */
3427 #define REAL_DEV_FEATURES(dev) \
3428 ((dev)->features & ~(NETIF_F_VLAN_FEATURES | NETIF_F_HW_MACSEC))
3429
3430 static int macsec_dev_init(struct net_device *dev)
3431 {
3432 struct macsec_dev *macsec = macsec_priv(dev);
3433 struct net_device *real_dev = macsec->real_dev;
3434 int err;
3435
3436 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3437 if (!dev->tstats)
3438 return -ENOMEM;
3439
3440 err = gro_cells_init(&macsec->gro_cells, dev);
3441 if (err) {
3442 free_percpu(dev->tstats);
3443 return err;
3444 }
3445
3446 if (macsec_is_offloaded(macsec)) {
3447 dev->features = REAL_DEV_FEATURES(real_dev);
3448 } else {
3449 dev->features = real_dev->features & SW_MACSEC_FEATURES;
3450 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
3451 }
3452
3453 dev->needed_headroom = real_dev->needed_headroom +
3454 MACSEC_NEEDED_HEADROOM;
3455 dev->needed_tailroom = real_dev->needed_tailroom +
3456 MACSEC_NEEDED_TAILROOM;
3457
3458 if (is_zero_ether_addr(dev->dev_addr))
3459 eth_hw_addr_inherit(dev, real_dev);
3460 if (is_zero_ether_addr(dev->broadcast))
3461 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3462
3463 return 0;
3464 }
3465
3466 static void macsec_dev_uninit(struct net_device *dev)
3467 {
3468 struct macsec_dev *macsec = macsec_priv(dev);
3469
3470 gro_cells_destroy(&macsec->gro_cells);
3471 free_percpu(dev->tstats);
3472 }
3473
3474 static netdev_features_t macsec_fix_features(struct net_device *dev,
3475 netdev_features_t features)
3476 {
3477 struct macsec_dev *macsec = macsec_priv(dev);
3478 struct net_device *real_dev = macsec->real_dev;
3479
3480 if (macsec_is_offloaded(macsec))
3481 return REAL_DEV_FEATURES(real_dev);
3482
3483 features &= (real_dev->features & SW_MACSEC_FEATURES) |
3484 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3485 features |= NETIF_F_LLTX;
3486
3487 return features;
3488 }
3489
3490 static int macsec_dev_open(struct net_device *dev)
3491 {
3492 struct macsec_dev *macsec = macsec_priv(dev);
3493 struct net_device *real_dev = macsec->real_dev;
3494 int err;
3495
3496 err = dev_uc_add(real_dev, dev->dev_addr);
3497 if (err < 0)
3498 return err;
3499
3500 if (dev->flags & IFF_ALLMULTI) {
3501 err = dev_set_allmulti(real_dev, 1);
3502 if (err < 0)
3503 goto del_unicast;
3504 }
3505
3506 if (dev->flags & IFF_PROMISC) {
3507 err = dev_set_promiscuity(real_dev, 1);
3508 if (err < 0)
3509 goto clear_allmulti;
3510 }
3511
3512 /* If h/w offloading is available, propagate to the device */
3513 if (macsec_is_offloaded(macsec)) {
3514 const struct macsec_ops *ops;
3515 struct macsec_context ctx;
3516
3517 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3518 if (!ops) {
3519 err = -EOPNOTSUPP;
3520 goto clear_allmulti;
3521 }
3522
3523 ctx.secy = &macsec->secy;
3524 err = macsec_offload(ops->mdo_dev_open, &ctx);
3525 if (err)
3526 goto clear_allmulti;
3527 }
3528
3529 if (netif_carrier_ok(real_dev))
3530 netif_carrier_on(dev);
3531
3532 return 0;
3533 clear_allmulti:
3534 if (dev->flags & IFF_ALLMULTI)
3535 dev_set_allmulti(real_dev, -1);
3536 del_unicast:
3537 dev_uc_del(real_dev, dev->dev_addr);
3538 netif_carrier_off(dev);
3539 return err;
3540 }
3541
3542 static int macsec_dev_stop(struct net_device *dev)
3543 {
3544 struct macsec_dev *macsec = macsec_priv(dev);
3545 struct net_device *real_dev = macsec->real_dev;
3546
3547 netif_carrier_off(dev);
3548
3549 /* If h/w offloading is available, propagate to the device */
3550 if (macsec_is_offloaded(macsec)) {
3551 const struct macsec_ops *ops;
3552 struct macsec_context ctx;
3553
3554 ops = macsec_get_ops(macsec, &ctx);
3555 if (ops) {
3556 ctx.secy = &macsec->secy;
3557 macsec_offload(ops->mdo_dev_stop, &ctx);
3558 }
3559 }
3560
3561 dev_mc_unsync(real_dev, dev);
3562 dev_uc_unsync(real_dev, dev);
3563
3564 if (dev->flags & IFF_ALLMULTI)
3565 dev_set_allmulti(real_dev, -1);
3566
3567 if (dev->flags & IFF_PROMISC)
3568 dev_set_promiscuity(real_dev, -1);
3569
3570 dev_uc_del(real_dev, dev->dev_addr);
3571
3572 return 0;
3573 }
3574
3575 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3576 {
3577 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3578
3579 if (!(dev->flags & IFF_UP))
3580 return;
3581
3582 if (change & IFF_ALLMULTI)
3583 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3584
3585 if (change & IFF_PROMISC)
3586 dev_set_promiscuity(real_dev,
3587 dev->flags & IFF_PROMISC ? 1 : -1);
3588 }
3589
3590 static void macsec_dev_set_rx_mode(struct net_device *dev)
3591 {
3592 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3593
3594 dev_mc_sync(real_dev, dev);
3595 dev_uc_sync(real_dev, dev);
3596 }
3597
3598 static int macsec_set_mac_address(struct net_device *dev, void *p)
3599 {
3600 struct macsec_dev *macsec = macsec_priv(dev);
3601 struct net_device *real_dev = macsec->real_dev;
3602 struct sockaddr *addr = p;
3603 int err;
3604
3605 if (!is_valid_ether_addr(addr->sa_data))
3606 return -EADDRNOTAVAIL;
3607
3608 if (!(dev->flags & IFF_UP))
3609 goto out;
3610
3611 err = dev_uc_add(real_dev, addr->sa_data);
3612 if (err < 0)
3613 return err;
3614
3615 dev_uc_del(real_dev, dev->dev_addr);
3616
3617 out:
3618 ether_addr_copy(dev->dev_addr, addr->sa_data);
3619 macsec->secy.sci = dev_to_sci(dev, MACSEC_PORT_ES);
3620
3621 /* If h/w offloading is available, propagate to the device */
3622 if (macsec_is_offloaded(macsec)) {
3623 const struct macsec_ops *ops;
3624 struct macsec_context ctx;
3625
3626 ops = macsec_get_ops(macsec, &ctx);
3627 if (ops) {
3628 ctx.secy = &macsec->secy;
3629 macsec_offload(ops->mdo_upd_secy, &ctx);
3630 }
3631 }
3632
3633 return 0;
3634 }
3635
3636 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3637 {
3638 struct macsec_dev *macsec = macsec_priv(dev);
3639 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3640
3641 if (macsec->real_dev->mtu - extra < new_mtu)
3642 return -ERANGE;
3643
3644 dev->mtu = new_mtu;
3645
3646 return 0;
3647 }
3648
3649 static void macsec_get_stats64(struct net_device *dev,
3650 struct rtnl_link_stats64 *s)
3651 {
3652 if (!dev->tstats)
3653 return;
3654
3655 dev_fetch_sw_netstats(s, dev->tstats);
3656
3657 s->rx_dropped = dev->stats.rx_dropped;
3658 s->tx_dropped = dev->stats.tx_dropped;
3659 }
3660
3661 static int macsec_get_iflink(const struct net_device *dev)
3662 {
3663 return macsec_priv(dev)->real_dev->ifindex;
3664 }
3665
3666 static const struct net_device_ops macsec_netdev_ops = {
3667 .ndo_init = macsec_dev_init,
3668 .ndo_uninit = macsec_dev_uninit,
3669 .ndo_open = macsec_dev_open,
3670 .ndo_stop = macsec_dev_stop,
3671 .ndo_fix_features = macsec_fix_features,
3672 .ndo_change_mtu = macsec_change_mtu,
3673 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
3674 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
3675 .ndo_set_mac_address = macsec_set_mac_address,
3676 .ndo_start_xmit = macsec_start_xmit,
3677 .ndo_get_stats64 = macsec_get_stats64,
3678 .ndo_get_iflink = macsec_get_iflink,
3679 };
3680
3681 static const struct device_type macsec_type = {
3682 .name = "macsec",
3683 };
3684
3685 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3686 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3687 [IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3688 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3689 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3690 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3691 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3692 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3693 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3694 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3695 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3696 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3697 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3698 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3699 };
3700
3701 static void macsec_free_netdev(struct net_device *dev)
3702 {
3703 struct macsec_dev *macsec = macsec_priv(dev);
3704
3705 free_percpu(macsec->stats);
3706 free_percpu(macsec->secy.tx_sc.stats);
3707
3708 }
3709
3710 static void macsec_setup(struct net_device *dev)
3711 {
3712 ether_setup(dev);
3713 dev->min_mtu = 0;
3714 dev->max_mtu = ETH_MAX_MTU;
3715 dev->priv_flags |= IFF_NO_QUEUE;
3716 dev->netdev_ops = &macsec_netdev_ops;
3717 dev->needs_free_netdev = true;
3718 dev->priv_destructor = macsec_free_netdev;
3719 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3720
3721 eth_zero_addr(dev->broadcast);
3722 }
3723
3724 static int macsec_changelink_common(struct net_device *dev,
3725 struct nlattr *data[])
3726 {
3727 struct macsec_secy *secy;
3728 struct macsec_tx_sc *tx_sc;
3729
3730 secy = &macsec_priv(dev)->secy;
3731 tx_sc = &secy->tx_sc;
3732
3733 if (data[IFLA_MACSEC_ENCODING_SA]) {
3734 struct macsec_tx_sa *tx_sa;
3735
3736 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3737 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3738
3739 secy->operational = tx_sa && tx_sa->active;
3740 }
3741
3742 if (data[IFLA_MACSEC_WINDOW])
3743 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3744
3745 if (data[IFLA_MACSEC_ENCRYPT])
3746 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3747
3748 if (data[IFLA_MACSEC_PROTECT])
3749 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3750
3751 if (data[IFLA_MACSEC_INC_SCI])
3752 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3753
3754 if (data[IFLA_MACSEC_ES])
3755 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3756
3757 if (data[IFLA_MACSEC_SCB])
3758 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3759
3760 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3761 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3762
3763 if (data[IFLA_MACSEC_VALIDATION])
3764 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3765
3766 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3767 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3768 case MACSEC_CIPHER_ID_GCM_AES_128:
3769 case MACSEC_DEFAULT_CIPHER_ID:
3770 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3771 secy->xpn = false;
3772 break;
3773 case MACSEC_CIPHER_ID_GCM_AES_256:
3774 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3775 secy->xpn = false;
3776 break;
3777 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
3778 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3779 secy->xpn = true;
3780 break;
3781 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
3782 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3783 secy->xpn = true;
3784 break;
3785 default:
3786 return -EINVAL;
3787 }
3788 }
3789
3790 return 0;
3791 }
3792
3793 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3794 struct nlattr *data[],
3795 struct netlink_ext_ack *extack)
3796 {
3797 struct macsec_dev *macsec = macsec_priv(dev);
3798 struct macsec_tx_sc tx_sc;
3799 struct macsec_secy secy;
3800 int ret;
3801
3802 if (!data)
3803 return 0;
3804
3805 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3806 data[IFLA_MACSEC_ICV_LEN] ||
3807 data[IFLA_MACSEC_SCI] ||
3808 data[IFLA_MACSEC_PORT])
3809 return -EINVAL;
3810
3811 /* Keep a copy of unmodified secy and tx_sc, in case the offload
3812 * propagation fails, to revert macsec_changelink_common.
3813 */
3814 memcpy(&secy, &macsec->secy, sizeof(secy));
3815 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3816
3817 ret = macsec_changelink_common(dev, data);
3818 if (ret)
3819 return ret;
3820
3821 /* If h/w offloading is available, propagate to the device */
3822 if (macsec_is_offloaded(macsec)) {
3823 const struct macsec_ops *ops;
3824 struct macsec_context ctx;
3825 int ret;
3826
3827 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3828 if (!ops) {
3829 ret = -EOPNOTSUPP;
3830 goto cleanup;
3831 }
3832
3833 ctx.secy = &macsec->secy;
3834 ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3835 if (ret)
3836 goto cleanup;
3837 }
3838
3839 return 0;
3840
3841 cleanup:
3842 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3843 memcpy(&macsec->secy, &secy, sizeof(secy));
3844
3845 return ret;
3846 }
3847
3848 static void macsec_del_dev(struct macsec_dev *macsec)
3849 {
3850 int i;
3851
3852 while (macsec->secy.rx_sc) {
3853 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3854
3855 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3856 free_rx_sc(rx_sc);
3857 }
3858
3859 for (i = 0; i < MACSEC_NUM_AN; i++) {
3860 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3861
3862 if (sa) {
3863 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3864 clear_tx_sa(sa);
3865 }
3866 }
3867 }
3868
3869 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3870 {
3871 struct macsec_dev *macsec = macsec_priv(dev);
3872 struct net_device *real_dev = macsec->real_dev;
3873
3874 /* If h/w offloading is available, propagate to the device */
3875 if (macsec_is_offloaded(macsec)) {
3876 const struct macsec_ops *ops;
3877 struct macsec_context ctx;
3878
3879 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3880 if (ops) {
3881 ctx.secy = &macsec->secy;
3882 macsec_offload(ops->mdo_del_secy, &ctx);
3883 }
3884 }
3885
3886 unregister_netdevice_queue(dev, head);
3887 list_del_rcu(&macsec->secys);
3888 macsec_del_dev(macsec);
3889 netdev_upper_dev_unlink(real_dev, dev);
3890
3891 macsec_generation++;
3892 }
3893
3894 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3895 {
3896 struct macsec_dev *macsec = macsec_priv(dev);
3897 struct net_device *real_dev = macsec->real_dev;
3898 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3899
3900 macsec_common_dellink(dev, head);
3901
3902 if (list_empty(&rxd->secys)) {
3903 netdev_rx_handler_unregister(real_dev);
3904 kfree(rxd);
3905 }
3906 }
3907
3908 static int register_macsec_dev(struct net_device *real_dev,
3909 struct net_device *dev)
3910 {
3911 struct macsec_dev *macsec = macsec_priv(dev);
3912 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3913
3914 if (!rxd) {
3915 int err;
3916
3917 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3918 if (!rxd)
3919 return -ENOMEM;
3920
3921 INIT_LIST_HEAD(&rxd->secys);
3922
3923 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3924 rxd);
3925 if (err < 0) {
3926 kfree(rxd);
3927 return err;
3928 }
3929 }
3930
3931 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3932 return 0;
3933 }
3934
3935 static bool sci_exists(struct net_device *dev, sci_t sci)
3936 {
3937 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3938 struct macsec_dev *macsec;
3939
3940 list_for_each_entry(macsec, &rxd->secys, secys) {
3941 if (macsec->secy.sci == sci)
3942 return true;
3943 }
3944
3945 return false;
3946 }
3947
3948 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3949 {
3950 struct macsec_dev *macsec = macsec_priv(dev);
3951 struct macsec_secy *secy = &macsec->secy;
3952
3953 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3954 if (!macsec->stats)
3955 return -ENOMEM;
3956
3957 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3958 if (!secy->tx_sc.stats) {
3959 free_percpu(macsec->stats);
3960 return -ENOMEM;
3961 }
3962
3963 if (sci == MACSEC_UNDEF_SCI)
3964 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3965
3966 secy->netdev = dev;
3967 secy->operational = true;
3968 secy->key_len = DEFAULT_SAK_LEN;
3969 secy->icv_len = icv_len;
3970 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3971 secy->protect_frames = true;
3972 secy->replay_protect = false;
3973 secy->xpn = DEFAULT_XPN;
3974
3975 secy->sci = sci;
3976 secy->tx_sc.active = true;
3977 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3978 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3979 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3980 secy->tx_sc.end_station = false;
3981 secy->tx_sc.scb = false;
3982
3983 return 0;
3984 }
3985
3986 static struct lock_class_key macsec_netdev_addr_lock_key;
3987
3988 static int macsec_newlink(struct net *net, struct net_device *dev,
3989 struct nlattr *tb[], struct nlattr *data[],
3990 struct netlink_ext_ack *extack)
3991 {
3992 struct macsec_dev *macsec = macsec_priv(dev);
3993 rx_handler_func_t *rx_handler;
3994 u8 icv_len = DEFAULT_ICV_LEN;
3995 struct net_device *real_dev;
3996 int err, mtu;
3997 sci_t sci;
3998
3999 if (!tb[IFLA_LINK])
4000 return -EINVAL;
4001 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
4002 if (!real_dev)
4003 return -ENODEV;
4004 if (real_dev->type != ARPHRD_ETHER)
4005 return -EINVAL;
4006
4007 dev->priv_flags |= IFF_MACSEC;
4008
4009 macsec->real_dev = real_dev;
4010
4011 if (data && data[IFLA_MACSEC_OFFLOAD])
4012 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
4013 else
4014 /* MACsec offloading is off by default */
4015 macsec->offload = MACSEC_OFFLOAD_OFF;
4016
4017 /* Check if the offloading mode is supported by the underlying layers */
4018 if (macsec->offload != MACSEC_OFFLOAD_OFF &&
4019 !macsec_check_offload(macsec->offload, macsec))
4020 return -EOPNOTSUPP;
4021
4022 /* send_sci must be set to true when transmit sci explicitly is set */
4023 if ((data && data[IFLA_MACSEC_SCI]) &&
4024 (data && data[IFLA_MACSEC_INC_SCI])) {
4025 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
4026
4027 if (!send_sci)
4028 return -EINVAL;
4029 }
4030
4031 if (data && data[IFLA_MACSEC_ICV_LEN])
4032 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4033 mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
4034 if (mtu < 0)
4035 dev->mtu = 0;
4036 else
4037 dev->mtu = mtu;
4038
4039 rx_handler = rtnl_dereference(real_dev->rx_handler);
4040 if (rx_handler && rx_handler != macsec_handle_frame)
4041 return -EBUSY;
4042
4043 err = register_netdevice(dev);
4044 if (err < 0)
4045 return err;
4046
4047 netdev_lockdep_set_classes(dev);
4048 lockdep_set_class(&dev->addr_list_lock,
4049 &macsec_netdev_addr_lock_key);
4050
4051 err = netdev_upper_dev_link(real_dev, dev, extack);
4052 if (err < 0)
4053 goto unregister;
4054
4055 /* need to be already registered so that ->init has run and
4056 * the MAC addr is set
4057 */
4058 if (data && data[IFLA_MACSEC_SCI])
4059 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
4060 else if (data && data[IFLA_MACSEC_PORT])
4061 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
4062 else
4063 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4064
4065 if (rx_handler && sci_exists(real_dev, sci)) {
4066 err = -EBUSY;
4067 goto unlink;
4068 }
4069
4070 err = macsec_add_dev(dev, sci, icv_len);
4071 if (err)
4072 goto unlink;
4073
4074 if (data) {
4075 err = macsec_changelink_common(dev, data);
4076 if (err)
4077 goto del_dev;
4078 }
4079
4080 /* If h/w offloading is available, propagate to the device */
4081 if (macsec_is_offloaded(macsec)) {
4082 const struct macsec_ops *ops;
4083 struct macsec_context ctx;
4084
4085 ops = macsec_get_ops(macsec, &ctx);
4086 if (ops) {
4087 ctx.secy = &macsec->secy;
4088 err = macsec_offload(ops->mdo_add_secy, &ctx);
4089 if (err)
4090 goto del_dev;
4091 }
4092 }
4093
4094 err = register_macsec_dev(real_dev, dev);
4095 if (err < 0)
4096 goto del_dev;
4097
4098 netif_stacked_transfer_operstate(real_dev, dev);
4099 linkwatch_fire_event(dev);
4100
4101 macsec_generation++;
4102
4103 return 0;
4104
4105 del_dev:
4106 macsec_del_dev(macsec);
4107 unlink:
4108 netdev_upper_dev_unlink(real_dev, dev);
4109 unregister:
4110 unregister_netdevice(dev);
4111 return err;
4112 }
4113
4114 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
4115 struct netlink_ext_ack *extack)
4116 {
4117 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
4118 u8 icv_len = DEFAULT_ICV_LEN;
4119 int flag;
4120 bool es, scb, sci;
4121
4122 if (!data)
4123 return 0;
4124
4125 if (data[IFLA_MACSEC_CIPHER_SUITE])
4126 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
4127
4128 if (data[IFLA_MACSEC_ICV_LEN]) {
4129 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4130 if (icv_len != DEFAULT_ICV_LEN) {
4131 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
4132 struct crypto_aead *dummy_tfm;
4133
4134 dummy_tfm = macsec_alloc_tfm(dummy_key,
4135 DEFAULT_SAK_LEN,
4136 icv_len);
4137 if (IS_ERR(dummy_tfm))
4138 return PTR_ERR(dummy_tfm);
4139 crypto_free_aead(dummy_tfm);
4140 }
4141 }
4142
4143 switch (csid) {
4144 case MACSEC_CIPHER_ID_GCM_AES_128:
4145 case MACSEC_CIPHER_ID_GCM_AES_256:
4146 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
4147 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
4148 case MACSEC_DEFAULT_CIPHER_ID:
4149 if (icv_len < MACSEC_MIN_ICV_LEN ||
4150 icv_len > MACSEC_STD_ICV_LEN)
4151 return -EINVAL;
4152 break;
4153 default:
4154 return -EINVAL;
4155 }
4156
4157 if (data[IFLA_MACSEC_ENCODING_SA]) {
4158 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
4159 return -EINVAL;
4160 }
4161
4162 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
4163 flag < IFLA_MACSEC_VALIDATION;
4164 flag++) {
4165 if (data[flag]) {
4166 if (nla_get_u8(data[flag]) > 1)
4167 return -EINVAL;
4168 }
4169 }
4170
4171 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
4172 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
4173 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
4174
4175 if ((sci && (scb || es)) || (scb && es))
4176 return -EINVAL;
4177
4178 if (data[IFLA_MACSEC_VALIDATION] &&
4179 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
4180 return -EINVAL;
4181
4182 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
4183 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
4184 !data[IFLA_MACSEC_WINDOW])
4185 return -EINVAL;
4186
4187 return 0;
4188 }
4189
4190 static struct net *macsec_get_link_net(const struct net_device *dev)
4191 {
4192 return dev_net(macsec_priv(dev)->real_dev);
4193 }
4194
4195 static size_t macsec_get_size(const struct net_device *dev)
4196 {
4197 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
4198 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
4199 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
4200 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
4201 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
4202 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
4203 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
4204 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
4205 nla_total_size(1) + /* IFLA_MACSEC_ES */
4206 nla_total_size(1) + /* IFLA_MACSEC_SCB */
4207 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
4208 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
4209 0;
4210 }
4211
4212 static int macsec_fill_info(struct sk_buff *skb,
4213 const struct net_device *dev)
4214 {
4215 struct macsec_secy *secy = &macsec_priv(dev)->secy;
4216 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
4217 u64 csid;
4218
4219 switch (secy->key_len) {
4220 case MACSEC_GCM_AES_128_SAK_LEN:
4221 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
4222 break;
4223 case MACSEC_GCM_AES_256_SAK_LEN:
4224 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
4225 break;
4226 default:
4227 goto nla_put_failure;
4228 }
4229
4230 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
4231 IFLA_MACSEC_PAD) ||
4232 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
4233 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
4234 csid, IFLA_MACSEC_PAD) ||
4235 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
4236 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
4237 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
4238 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
4239 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
4240 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
4241 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
4242 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
4243 0)
4244 goto nla_put_failure;
4245
4246 if (secy->replay_protect) {
4247 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
4248 goto nla_put_failure;
4249 }
4250
4251 return 0;
4252
4253 nla_put_failure:
4254 return -EMSGSIZE;
4255 }
4256
4257 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
4258 .kind = "macsec",
4259 .priv_size = sizeof(struct macsec_dev),
4260 .maxtype = IFLA_MACSEC_MAX,
4261 .policy = macsec_rtnl_policy,
4262 .setup = macsec_setup,
4263 .validate = macsec_validate_attr,
4264 .newlink = macsec_newlink,
4265 .changelink = macsec_changelink,
4266 .dellink = macsec_dellink,
4267 .get_size = macsec_get_size,
4268 .fill_info = macsec_fill_info,
4269 .get_link_net = macsec_get_link_net,
4270 };
4271
4272 static bool is_macsec_master(struct net_device *dev)
4273 {
4274 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
4275 }
4276
4277 static int macsec_notify(struct notifier_block *this, unsigned long event,
4278 void *ptr)
4279 {
4280 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
4281 LIST_HEAD(head);
4282
4283 if (!is_macsec_master(real_dev))
4284 return NOTIFY_DONE;
4285
4286 switch (event) {
4287 case NETDEV_DOWN:
4288 case NETDEV_UP:
4289 case NETDEV_CHANGE: {
4290 struct macsec_dev *m, *n;
4291 struct macsec_rxh_data *rxd;
4292
4293 rxd = macsec_data_rtnl(real_dev);
4294 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4295 struct net_device *dev = m->secy.netdev;
4296
4297 netif_stacked_transfer_operstate(real_dev, dev);
4298 }
4299 break;
4300 }
4301 case NETDEV_UNREGISTER: {
4302 struct macsec_dev *m, *n;
4303 struct macsec_rxh_data *rxd;
4304
4305 rxd = macsec_data_rtnl(real_dev);
4306 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4307 macsec_common_dellink(m->secy.netdev, &head);
4308 }
4309
4310 netdev_rx_handler_unregister(real_dev);
4311 kfree(rxd);
4312
4313 unregister_netdevice_many(&head);
4314 break;
4315 }
4316 case NETDEV_CHANGEMTU: {
4317 struct macsec_dev *m;
4318 struct macsec_rxh_data *rxd;
4319
4320 rxd = macsec_data_rtnl(real_dev);
4321 list_for_each_entry(m, &rxd->secys, secys) {
4322 struct net_device *dev = m->secy.netdev;
4323 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
4324 macsec_extra_len(true));
4325
4326 if (dev->mtu > mtu)
4327 dev_set_mtu(dev, mtu);
4328 }
4329 }
4330 }
4331
4332 return NOTIFY_OK;
4333 }
4334
4335 static struct notifier_block macsec_notifier = {
4336 .notifier_call = macsec_notify,
4337 };
4338
4339 static int __init macsec_init(void)
4340 {
4341 int err;
4342
4343 pr_info("MACsec IEEE 802.1AE\n");
4344 err = register_netdevice_notifier(&macsec_notifier);
4345 if (err)
4346 return err;
4347
4348 err = rtnl_link_register(&macsec_link_ops);
4349 if (err)
4350 goto notifier;
4351
4352 err = genl_register_family(&macsec_fam);
4353 if (err)
4354 goto rtnl;
4355
4356 return 0;
4357
4358 rtnl:
4359 rtnl_link_unregister(&macsec_link_ops);
4360 notifier:
4361 unregister_netdevice_notifier(&macsec_notifier);
4362 return err;
4363 }
4364
4365 static void __exit macsec_exit(void)
4366 {
4367 genl_unregister_family(&macsec_fam);
4368 rtnl_link_unregister(&macsec_link_ops);
4369 unregister_netdevice_notifier(&macsec_notifier);
4370 rcu_barrier();
4371 }
4372
4373 module_init(macsec_init);
4374 module_exit(macsec_exit);
4375
4376 MODULE_ALIAS_RTNL_LINK("macsec");
4377 MODULE_ALIAS_GENL_FAMILY("macsec");
4378
4379 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
4380 MODULE_LICENSE("GPL v2");
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