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Merge branches 'pm-opp-fixes', 'pm-cpufreq-fixes' and 'pm-cpuidle-fixes'
[deliverable/linux.git] / drivers / net / macsec.c
1 /*
2 * drivers/net/macsec.c - MACsec device
3 *
4 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12 #include <linux/types.h>
13 #include <linux/skbuff.h>
14 #include <linux/socket.h>
15 #include <linux/module.h>
16 #include <crypto/aead.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rtnetlink.h>
19 #include <net/genetlink.h>
20 #include <net/sock.h>
21
22 #include <uapi/linux/if_macsec.h>
23
24 typedef u64 __bitwise sci_t;
25
26 #define MACSEC_SCI_LEN 8
27
28 /* SecTAG length = macsec_eth_header without the optional SCI */
29 #define MACSEC_TAG_LEN 6
30
31 struct macsec_eth_header {
32 struct ethhdr eth;
33 /* SecTAG */
34 u8 tci_an;
35 #if defined(__LITTLE_ENDIAN_BITFIELD)
36 u8 short_length:6,
37 unused:2;
38 #elif defined(__BIG_ENDIAN_BITFIELD)
39 u8 unused:2,
40 short_length:6;
41 #else
42 #error "Please fix <asm/byteorder.h>"
43 #endif
44 __be32 packet_number;
45 u8 secure_channel_id[8]; /* optional */
46 } __packed;
47
48 #define MACSEC_TCI_VERSION 0x80
49 #define MACSEC_TCI_ES 0x40 /* end station */
50 #define MACSEC_TCI_SC 0x20 /* SCI present */
51 #define MACSEC_TCI_SCB 0x10 /* epon */
52 #define MACSEC_TCI_E 0x08 /* encryption */
53 #define MACSEC_TCI_C 0x04 /* changed text */
54 #define MACSEC_AN_MASK 0x03 /* association number */
55 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
56
57 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
58 #define MIN_NON_SHORT_LEN 48
59
60 #define GCM_AES_IV_LEN 12
61 #define DEFAULT_ICV_LEN 16
62
63 #define MACSEC_NUM_AN 4 /* 2 bits for the association number */
64
65 #define for_each_rxsc(secy, sc) \
66 for (sc = rcu_dereference_bh(secy->rx_sc); \
67 sc; \
68 sc = rcu_dereference_bh(sc->next))
69 #define for_each_rxsc_rtnl(secy, sc) \
70 for (sc = rtnl_dereference(secy->rx_sc); \
71 sc; \
72 sc = rtnl_dereference(sc->next))
73
74 struct gcm_iv {
75 union {
76 u8 secure_channel_id[8];
77 sci_t sci;
78 };
79 __be32 pn;
80 };
81
82 /**
83 * struct macsec_key - SA key
84 * @id: user-provided key identifier
85 * @tfm: crypto struct, key storage
86 */
87 struct macsec_key {
88 u64 id;
89 struct crypto_aead *tfm;
90 };
91
92 struct macsec_rx_sc_stats {
93 __u64 InOctetsValidated;
94 __u64 InOctetsDecrypted;
95 __u64 InPktsUnchecked;
96 __u64 InPktsDelayed;
97 __u64 InPktsOK;
98 __u64 InPktsInvalid;
99 __u64 InPktsLate;
100 __u64 InPktsNotValid;
101 __u64 InPktsNotUsingSA;
102 __u64 InPktsUnusedSA;
103 };
104
105 struct macsec_rx_sa_stats {
106 __u32 InPktsOK;
107 __u32 InPktsInvalid;
108 __u32 InPktsNotValid;
109 __u32 InPktsNotUsingSA;
110 __u32 InPktsUnusedSA;
111 };
112
113 struct macsec_tx_sa_stats {
114 __u32 OutPktsProtected;
115 __u32 OutPktsEncrypted;
116 };
117
118 struct macsec_tx_sc_stats {
119 __u64 OutPktsProtected;
120 __u64 OutPktsEncrypted;
121 __u64 OutOctetsProtected;
122 __u64 OutOctetsEncrypted;
123 };
124
125 struct macsec_dev_stats {
126 __u64 OutPktsUntagged;
127 __u64 InPktsUntagged;
128 __u64 OutPktsTooLong;
129 __u64 InPktsNoTag;
130 __u64 InPktsBadTag;
131 __u64 InPktsUnknownSCI;
132 __u64 InPktsNoSCI;
133 __u64 InPktsOverrun;
134 };
135
136 /**
137 * struct macsec_rx_sa - receive secure association
138 * @active:
139 * @next_pn: packet number expected for the next packet
140 * @lock: protects next_pn manipulations
141 * @key: key structure
142 * @stats: per-SA stats
143 */
144 struct macsec_rx_sa {
145 struct macsec_key key;
146 spinlock_t lock;
147 u32 next_pn;
148 atomic_t refcnt;
149 bool active;
150 struct macsec_rx_sa_stats __percpu *stats;
151 struct macsec_rx_sc *sc;
152 struct rcu_head rcu;
153 };
154
155 struct pcpu_rx_sc_stats {
156 struct macsec_rx_sc_stats stats;
157 struct u64_stats_sync syncp;
158 };
159
160 /**
161 * struct macsec_rx_sc - receive secure channel
162 * @sci: secure channel identifier for this SC
163 * @active: channel is active
164 * @sa: array of secure associations
165 * @stats: per-SC stats
166 */
167 struct macsec_rx_sc {
168 struct macsec_rx_sc __rcu *next;
169 sci_t sci;
170 bool active;
171 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN];
172 struct pcpu_rx_sc_stats __percpu *stats;
173 atomic_t refcnt;
174 struct rcu_head rcu_head;
175 };
176
177 /**
178 * struct macsec_tx_sa - transmit secure association
179 * @active:
180 * @next_pn: packet number to use for the next packet
181 * @lock: protects next_pn manipulations
182 * @key: key structure
183 * @stats: per-SA stats
184 */
185 struct macsec_tx_sa {
186 struct macsec_key key;
187 spinlock_t lock;
188 u32 next_pn;
189 atomic_t refcnt;
190 bool active;
191 struct macsec_tx_sa_stats __percpu *stats;
192 struct rcu_head rcu;
193 };
194
195 struct pcpu_tx_sc_stats {
196 struct macsec_tx_sc_stats stats;
197 struct u64_stats_sync syncp;
198 };
199
200 /**
201 * struct macsec_tx_sc - transmit secure channel
202 * @active:
203 * @encoding_sa: association number of the SA currently in use
204 * @encrypt: encrypt packets on transmit, or authenticate only
205 * @send_sci: always include the SCI in the SecTAG
206 * @end_station:
207 * @scb: single copy broadcast flag
208 * @sa: array of secure associations
209 * @stats: stats for this TXSC
210 */
211 struct macsec_tx_sc {
212 bool active;
213 u8 encoding_sa;
214 bool encrypt;
215 bool send_sci;
216 bool end_station;
217 bool scb;
218 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN];
219 struct pcpu_tx_sc_stats __percpu *stats;
220 };
221
222 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
223
224 /**
225 * struct macsec_secy - MACsec Security Entity
226 * @netdev: netdevice for this SecY
227 * @n_rx_sc: number of receive secure channels configured on this SecY
228 * @sci: secure channel identifier used for tx
229 * @key_len: length of keys used by the cipher suite
230 * @icv_len: length of ICV used by the cipher suite
231 * @validate_frames: validation mode
232 * @operational: MAC_Operational flag
233 * @protect_frames: enable protection for this SecY
234 * @replay_protect: enable packet number checks on receive
235 * @replay_window: size of the replay window
236 * @tx_sc: transmit secure channel
237 * @rx_sc: linked list of receive secure channels
238 */
239 struct macsec_secy {
240 struct net_device *netdev;
241 unsigned int n_rx_sc;
242 sci_t sci;
243 u16 key_len;
244 u16 icv_len;
245 enum macsec_validation_type validate_frames;
246 bool operational;
247 bool protect_frames;
248 bool replay_protect;
249 u32 replay_window;
250 struct macsec_tx_sc tx_sc;
251 struct macsec_rx_sc __rcu *rx_sc;
252 };
253
254 struct pcpu_secy_stats {
255 struct macsec_dev_stats stats;
256 struct u64_stats_sync syncp;
257 };
258
259 /**
260 * struct macsec_dev - private data
261 * @secy: SecY config
262 * @real_dev: pointer to underlying netdevice
263 * @stats: MACsec device stats
264 * @secys: linked list of SecY's on the underlying device
265 */
266 struct macsec_dev {
267 struct macsec_secy secy;
268 struct net_device *real_dev;
269 struct pcpu_secy_stats __percpu *stats;
270 struct list_head secys;
271 };
272
273 /**
274 * struct macsec_rxh_data - rx_handler private argument
275 * @secys: linked list of SecY's on this underlying device
276 */
277 struct macsec_rxh_data {
278 struct list_head secys;
279 };
280
281 static struct macsec_dev *macsec_priv(const struct net_device *dev)
282 {
283 return (struct macsec_dev *)netdev_priv(dev);
284 }
285
286 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
287 {
288 return rcu_dereference_bh(dev->rx_handler_data);
289 }
290
291 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
292 {
293 return rtnl_dereference(dev->rx_handler_data);
294 }
295
296 struct macsec_cb {
297 struct aead_request *req;
298 union {
299 struct macsec_tx_sa *tx_sa;
300 struct macsec_rx_sa *rx_sa;
301 };
302 u8 assoc_num;
303 bool valid;
304 bool has_sci;
305 };
306
307 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
308 {
309 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
310
311 if (!sa || !sa->active)
312 return NULL;
313
314 if (!atomic_inc_not_zero(&sa->refcnt))
315 return NULL;
316
317 return sa;
318 }
319
320 static void free_rx_sc_rcu(struct rcu_head *head)
321 {
322 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
323
324 free_percpu(rx_sc->stats);
325 kfree(rx_sc);
326 }
327
328 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
329 {
330 return atomic_inc_not_zero(&sc->refcnt) ? sc : NULL;
331 }
332
333 static void macsec_rxsc_put(struct macsec_rx_sc *sc)
334 {
335 if (atomic_dec_and_test(&sc->refcnt))
336 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
337 }
338
339 static void free_rxsa(struct rcu_head *head)
340 {
341 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
342
343 crypto_free_aead(sa->key.tfm);
344 free_percpu(sa->stats);
345 macsec_rxsc_put(sa->sc);
346 kfree(sa);
347 }
348
349 static void macsec_rxsa_put(struct macsec_rx_sa *sa)
350 {
351 if (atomic_dec_and_test(&sa->refcnt))
352 call_rcu(&sa->rcu, free_rxsa);
353 }
354
355 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
356 {
357 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
358
359 if (!sa || !sa->active)
360 return NULL;
361
362 if (!atomic_inc_not_zero(&sa->refcnt))
363 return NULL;
364
365 return sa;
366 }
367
368 static void free_txsa(struct rcu_head *head)
369 {
370 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
371
372 crypto_free_aead(sa->key.tfm);
373 free_percpu(sa->stats);
374 kfree(sa);
375 }
376
377 static void macsec_txsa_put(struct macsec_tx_sa *sa)
378 {
379 if (atomic_dec_and_test(&sa->refcnt))
380 call_rcu(&sa->rcu, free_txsa);
381 }
382
383 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
384 {
385 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
386 return (struct macsec_cb *)skb->cb;
387 }
388
389 #define MACSEC_PORT_ES (htons(0x0001))
390 #define MACSEC_PORT_SCB (0x0000)
391 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
392
393 #define DEFAULT_SAK_LEN 16
394 #define DEFAULT_SEND_SCI true
395 #define DEFAULT_ENCRYPT false
396 #define DEFAULT_ENCODING_SA 0
397
398 static sci_t make_sci(u8 *addr, __be16 port)
399 {
400 sci_t sci;
401
402 memcpy(&sci, addr, ETH_ALEN);
403 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
404
405 return sci;
406 }
407
408 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
409 {
410 sci_t sci;
411
412 if (sci_present)
413 memcpy(&sci, hdr->secure_channel_id,
414 sizeof(hdr->secure_channel_id));
415 else
416 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
417
418 return sci;
419 }
420
421 static unsigned int macsec_sectag_len(bool sci_present)
422 {
423 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
424 }
425
426 static unsigned int macsec_hdr_len(bool sci_present)
427 {
428 return macsec_sectag_len(sci_present) + ETH_HLEN;
429 }
430
431 static unsigned int macsec_extra_len(bool sci_present)
432 {
433 return macsec_sectag_len(sci_present) + sizeof(__be16);
434 }
435
436 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
437 static void macsec_fill_sectag(struct macsec_eth_header *h,
438 const struct macsec_secy *secy, u32 pn)
439 {
440 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
441
442 memset(&h->tci_an, 0, macsec_sectag_len(tx_sc->send_sci));
443 h->eth.h_proto = htons(ETH_P_MACSEC);
444
445 if (tx_sc->send_sci ||
446 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb)) {
447 h->tci_an |= MACSEC_TCI_SC;
448 memcpy(&h->secure_channel_id, &secy->sci,
449 sizeof(h->secure_channel_id));
450 } else {
451 if (tx_sc->end_station)
452 h->tci_an |= MACSEC_TCI_ES;
453 if (tx_sc->scb)
454 h->tci_an |= MACSEC_TCI_SCB;
455 }
456
457 h->packet_number = htonl(pn);
458
459 /* with GCM, C/E clear for !encrypt, both set for encrypt */
460 if (tx_sc->encrypt)
461 h->tci_an |= MACSEC_TCI_CONFID;
462 else if (secy->icv_len != DEFAULT_ICV_LEN)
463 h->tci_an |= MACSEC_TCI_C;
464
465 h->tci_an |= tx_sc->encoding_sa;
466 }
467
468 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
469 {
470 if (data_len < MIN_NON_SHORT_LEN)
471 h->short_length = data_len;
472 }
473
474 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
475 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
476 {
477 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
478 int len = skb->len - 2 * ETH_ALEN;
479 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
480
481 /* a) It comprises at least 17 octets */
482 if (skb->len <= 16)
483 return false;
484
485 /* b) MACsec EtherType: already checked */
486
487 /* c) V bit is clear */
488 if (h->tci_an & MACSEC_TCI_VERSION)
489 return false;
490
491 /* d) ES or SCB => !SC */
492 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
493 (h->tci_an & MACSEC_TCI_SC))
494 return false;
495
496 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
497 if (h->unused)
498 return false;
499
500 /* rx.pn != 0 (figure 10-5) */
501 if (!h->packet_number)
502 return false;
503
504 /* length check, f) g) h) i) */
505 if (h->short_length)
506 return len == extra_len + h->short_length;
507 return len >= extra_len + MIN_NON_SHORT_LEN;
508 }
509
510 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
511 #define MACSEC_NEEDED_TAILROOM MACSEC_MAX_ICV_LEN
512
513 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
514 {
515 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
516
517 gcm_iv->sci = sci;
518 gcm_iv->pn = htonl(pn);
519 }
520
521 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
522 {
523 return (struct macsec_eth_header *)skb_mac_header(skb);
524 }
525
526 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
527 {
528 u32 pn;
529
530 spin_lock_bh(&tx_sa->lock);
531 pn = tx_sa->next_pn;
532
533 tx_sa->next_pn++;
534 if (tx_sa->next_pn == 0) {
535 pr_debug("PN wrapped, transitioning to !oper\n");
536 tx_sa->active = false;
537 if (secy->protect_frames)
538 secy->operational = false;
539 }
540 spin_unlock_bh(&tx_sa->lock);
541
542 return pn;
543 }
544
545 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
546 {
547 struct macsec_dev *macsec = netdev_priv(dev);
548
549 skb->dev = macsec->real_dev;
550 skb_reset_mac_header(skb);
551 skb->protocol = eth_hdr(skb)->h_proto;
552 }
553
554 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
555 struct macsec_tx_sa *tx_sa)
556 {
557 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
558
559 u64_stats_update_begin(&txsc_stats->syncp);
560 if (tx_sc->encrypt) {
561 txsc_stats->stats.OutOctetsEncrypted += skb->len;
562 txsc_stats->stats.OutPktsEncrypted++;
563 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
564 } else {
565 txsc_stats->stats.OutOctetsProtected += skb->len;
566 txsc_stats->stats.OutPktsProtected++;
567 this_cpu_inc(tx_sa->stats->OutPktsProtected);
568 }
569 u64_stats_update_end(&txsc_stats->syncp);
570 }
571
572 static void count_tx(struct net_device *dev, int ret, int len)
573 {
574 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
575 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
576
577 u64_stats_update_begin(&stats->syncp);
578 stats->tx_packets++;
579 stats->tx_bytes += len;
580 u64_stats_update_end(&stats->syncp);
581 } else {
582 dev->stats.tx_dropped++;
583 }
584 }
585
586 static void macsec_encrypt_done(struct crypto_async_request *base, int err)
587 {
588 struct sk_buff *skb = base->data;
589 struct net_device *dev = skb->dev;
590 struct macsec_dev *macsec = macsec_priv(dev);
591 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
592 int len, ret;
593
594 aead_request_free(macsec_skb_cb(skb)->req);
595
596 rcu_read_lock_bh();
597 macsec_encrypt_finish(skb, dev);
598 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
599 len = skb->len;
600 ret = dev_queue_xmit(skb);
601 count_tx(dev, ret, len);
602 rcu_read_unlock_bh();
603
604 macsec_txsa_put(sa);
605 dev_put(dev);
606 }
607
608 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
609 struct net_device *dev)
610 {
611 int ret;
612 struct scatterlist sg[MAX_SKB_FRAGS + 1];
613 unsigned char iv[GCM_AES_IV_LEN];
614 struct ethhdr *eth;
615 struct macsec_eth_header *hh;
616 size_t unprotected_len;
617 struct aead_request *req;
618 struct macsec_secy *secy;
619 struct macsec_tx_sc *tx_sc;
620 struct macsec_tx_sa *tx_sa;
621 struct macsec_dev *macsec = macsec_priv(dev);
622 u32 pn;
623
624 secy = &macsec->secy;
625 tx_sc = &secy->tx_sc;
626
627 /* 10.5.1 TX SA assignment */
628 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
629 if (!tx_sa) {
630 secy->operational = false;
631 kfree_skb(skb);
632 return ERR_PTR(-EINVAL);
633 }
634
635 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
636 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
637 struct sk_buff *nskb = skb_copy_expand(skb,
638 MACSEC_NEEDED_HEADROOM,
639 MACSEC_NEEDED_TAILROOM,
640 GFP_ATOMIC);
641 if (likely(nskb)) {
642 consume_skb(skb);
643 skb = nskb;
644 } else {
645 macsec_txsa_put(tx_sa);
646 kfree_skb(skb);
647 return ERR_PTR(-ENOMEM);
648 }
649 } else {
650 skb = skb_unshare(skb, GFP_ATOMIC);
651 if (!skb) {
652 macsec_txsa_put(tx_sa);
653 return ERR_PTR(-ENOMEM);
654 }
655 }
656
657 unprotected_len = skb->len;
658 eth = eth_hdr(skb);
659 hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(tx_sc->send_sci));
660 memmove(hh, eth, 2 * ETH_ALEN);
661
662 pn = tx_sa_update_pn(tx_sa, secy);
663 if (pn == 0) {
664 macsec_txsa_put(tx_sa);
665 kfree_skb(skb);
666 return ERR_PTR(-ENOLINK);
667 }
668 macsec_fill_sectag(hh, secy, pn);
669 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
670
671 macsec_fill_iv(iv, secy->sci, pn);
672
673 skb_put(skb, secy->icv_len);
674
675 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
676 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
677
678 u64_stats_update_begin(&secy_stats->syncp);
679 secy_stats->stats.OutPktsTooLong++;
680 u64_stats_update_end(&secy_stats->syncp);
681
682 macsec_txsa_put(tx_sa);
683 kfree_skb(skb);
684 return ERR_PTR(-EINVAL);
685 }
686
687 req = aead_request_alloc(tx_sa->key.tfm, GFP_ATOMIC);
688 if (!req) {
689 macsec_txsa_put(tx_sa);
690 kfree_skb(skb);
691 return ERR_PTR(-ENOMEM);
692 }
693
694 sg_init_table(sg, MAX_SKB_FRAGS + 1);
695 skb_to_sgvec(skb, sg, 0, skb->len);
696
697 if (tx_sc->encrypt) {
698 int len = skb->len - macsec_hdr_len(tx_sc->send_sci) -
699 secy->icv_len;
700 aead_request_set_crypt(req, sg, sg, len, iv);
701 aead_request_set_ad(req, macsec_hdr_len(tx_sc->send_sci));
702 } else {
703 aead_request_set_crypt(req, sg, sg, 0, iv);
704 aead_request_set_ad(req, skb->len - secy->icv_len);
705 }
706
707 macsec_skb_cb(skb)->req = req;
708 macsec_skb_cb(skb)->tx_sa = tx_sa;
709 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
710
711 dev_hold(skb->dev);
712 ret = crypto_aead_encrypt(req);
713 if (ret == -EINPROGRESS) {
714 return ERR_PTR(ret);
715 } else if (ret != 0) {
716 dev_put(skb->dev);
717 kfree_skb(skb);
718 aead_request_free(req);
719 macsec_txsa_put(tx_sa);
720 return ERR_PTR(-EINVAL);
721 }
722
723 dev_put(skb->dev);
724 aead_request_free(req);
725 macsec_txsa_put(tx_sa);
726
727 return skb;
728 }
729
730 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
731 {
732 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
733 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
734 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
735 u32 lowest_pn = 0;
736
737 spin_lock(&rx_sa->lock);
738 if (rx_sa->next_pn >= secy->replay_window)
739 lowest_pn = rx_sa->next_pn - secy->replay_window;
740
741 /* Now perform replay protection check again
742 * (see IEEE 802.1AE-2006 figure 10-5)
743 */
744 if (secy->replay_protect && pn < lowest_pn) {
745 spin_unlock(&rx_sa->lock);
746 u64_stats_update_begin(&rxsc_stats->syncp);
747 rxsc_stats->stats.InPktsLate++;
748 u64_stats_update_end(&rxsc_stats->syncp);
749 return false;
750 }
751
752 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
753 u64_stats_update_begin(&rxsc_stats->syncp);
754 if (hdr->tci_an & MACSEC_TCI_E)
755 rxsc_stats->stats.InOctetsDecrypted += skb->len;
756 else
757 rxsc_stats->stats.InOctetsValidated += skb->len;
758 u64_stats_update_end(&rxsc_stats->syncp);
759 }
760
761 if (!macsec_skb_cb(skb)->valid) {
762 spin_unlock(&rx_sa->lock);
763
764 /* 10.6.5 */
765 if (hdr->tci_an & MACSEC_TCI_C ||
766 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
767 u64_stats_update_begin(&rxsc_stats->syncp);
768 rxsc_stats->stats.InPktsNotValid++;
769 u64_stats_update_end(&rxsc_stats->syncp);
770 return false;
771 }
772
773 u64_stats_update_begin(&rxsc_stats->syncp);
774 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
775 rxsc_stats->stats.InPktsInvalid++;
776 this_cpu_inc(rx_sa->stats->InPktsInvalid);
777 } else if (pn < lowest_pn) {
778 rxsc_stats->stats.InPktsDelayed++;
779 } else {
780 rxsc_stats->stats.InPktsUnchecked++;
781 }
782 u64_stats_update_end(&rxsc_stats->syncp);
783 } else {
784 u64_stats_update_begin(&rxsc_stats->syncp);
785 if (pn < lowest_pn) {
786 rxsc_stats->stats.InPktsDelayed++;
787 } else {
788 rxsc_stats->stats.InPktsOK++;
789 this_cpu_inc(rx_sa->stats->InPktsOK);
790 }
791 u64_stats_update_end(&rxsc_stats->syncp);
792
793 if (pn >= rx_sa->next_pn)
794 rx_sa->next_pn = pn + 1;
795 spin_unlock(&rx_sa->lock);
796 }
797
798 return true;
799 }
800
801 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
802 {
803 skb->pkt_type = PACKET_HOST;
804 skb->protocol = eth_type_trans(skb, dev);
805
806 skb_reset_network_header(skb);
807 if (!skb_transport_header_was_set(skb))
808 skb_reset_transport_header(skb);
809 skb_reset_mac_len(skb);
810 }
811
812 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
813 {
814 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
815 skb_pull(skb, hdr_len);
816 pskb_trim_unique(skb, skb->len - icv_len);
817 }
818
819 static void count_rx(struct net_device *dev, int len)
820 {
821 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
822
823 u64_stats_update_begin(&stats->syncp);
824 stats->rx_packets++;
825 stats->rx_bytes += len;
826 u64_stats_update_end(&stats->syncp);
827 }
828
829 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
830 {
831 struct sk_buff *skb = base->data;
832 struct net_device *dev = skb->dev;
833 struct macsec_dev *macsec = macsec_priv(dev);
834 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
835 int len, ret;
836 u32 pn;
837
838 aead_request_free(macsec_skb_cb(skb)->req);
839
840 rcu_read_lock_bh();
841 pn = ntohl(macsec_ethhdr(skb)->packet_number);
842 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
843 rcu_read_unlock_bh();
844 kfree_skb(skb);
845 goto out;
846 }
847
848 macsec_finalize_skb(skb, macsec->secy.icv_len,
849 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
850 macsec_reset_skb(skb, macsec->secy.netdev);
851
852 len = skb->len;
853 ret = netif_rx(skb);
854 if (ret == NET_RX_SUCCESS)
855 count_rx(dev, len);
856 else
857 macsec->secy.netdev->stats.rx_dropped++;
858
859 rcu_read_unlock_bh();
860
861 out:
862 macsec_rxsa_put(rx_sa);
863 dev_put(dev);
864 return;
865 }
866
867 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
868 struct net_device *dev,
869 struct macsec_rx_sa *rx_sa,
870 sci_t sci,
871 struct macsec_secy *secy)
872 {
873 int ret;
874 struct scatterlist sg[MAX_SKB_FRAGS + 1];
875 unsigned char iv[GCM_AES_IV_LEN];
876 struct aead_request *req;
877 struct macsec_eth_header *hdr;
878 u16 icv_len = secy->icv_len;
879
880 macsec_skb_cb(skb)->valid = false;
881 skb = skb_share_check(skb, GFP_ATOMIC);
882 if (!skb)
883 return ERR_PTR(-ENOMEM);
884
885 req = aead_request_alloc(rx_sa->key.tfm, GFP_ATOMIC);
886 if (!req) {
887 kfree_skb(skb);
888 return ERR_PTR(-ENOMEM);
889 }
890
891 hdr = (struct macsec_eth_header *)skb->data;
892 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
893
894 sg_init_table(sg, MAX_SKB_FRAGS + 1);
895 skb_to_sgvec(skb, sg, 0, skb->len);
896
897 if (hdr->tci_an & MACSEC_TCI_E) {
898 /* confidentiality: ethernet + macsec header
899 * authenticated, encrypted payload
900 */
901 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
902
903 aead_request_set_crypt(req, sg, sg, len, iv);
904 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
905 skb = skb_unshare(skb, GFP_ATOMIC);
906 if (!skb) {
907 aead_request_free(req);
908 return ERR_PTR(-ENOMEM);
909 }
910 } else {
911 /* integrity only: all headers + data authenticated */
912 aead_request_set_crypt(req, sg, sg, icv_len, iv);
913 aead_request_set_ad(req, skb->len - icv_len);
914 }
915
916 macsec_skb_cb(skb)->req = req;
917 macsec_skb_cb(skb)->rx_sa = rx_sa;
918 skb->dev = dev;
919 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
920
921 dev_hold(dev);
922 ret = crypto_aead_decrypt(req);
923 if (ret == -EINPROGRESS) {
924 return ERR_PTR(ret);
925 } else if (ret != 0) {
926 /* decryption/authentication failed
927 * 10.6 if validateFrames is disabled, deliver anyway
928 */
929 if (ret != -EBADMSG) {
930 kfree_skb(skb);
931 skb = ERR_PTR(ret);
932 }
933 } else {
934 macsec_skb_cb(skb)->valid = true;
935 }
936 dev_put(dev);
937
938 aead_request_free(req);
939
940 return skb;
941 }
942
943 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
944 {
945 struct macsec_rx_sc *rx_sc;
946
947 for_each_rxsc(secy, rx_sc) {
948 if (rx_sc->sci == sci)
949 return rx_sc;
950 }
951
952 return NULL;
953 }
954
955 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
956 {
957 struct macsec_rx_sc *rx_sc;
958
959 for_each_rxsc_rtnl(secy, rx_sc) {
960 if (rx_sc->sci == sci)
961 return rx_sc;
962 }
963
964 return NULL;
965 }
966
967 static void handle_not_macsec(struct sk_buff *skb)
968 {
969 struct macsec_rxh_data *rxd;
970 struct macsec_dev *macsec;
971
972 rcu_read_lock();
973 rxd = macsec_data_rcu(skb->dev);
974
975 /* 10.6 If the management control validateFrames is not
976 * Strict, frames without a SecTAG are received, counted, and
977 * delivered to the Controlled Port
978 */
979 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
980 struct sk_buff *nskb;
981 int ret;
982 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
983
984 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
985 u64_stats_update_begin(&secy_stats->syncp);
986 secy_stats->stats.InPktsNoTag++;
987 u64_stats_update_end(&secy_stats->syncp);
988 continue;
989 }
990
991 /* deliver on this port */
992 nskb = skb_clone(skb, GFP_ATOMIC);
993 if (!nskb)
994 break;
995
996 nskb->dev = macsec->secy.netdev;
997
998 ret = netif_rx(nskb);
999 if (ret == NET_RX_SUCCESS) {
1000 u64_stats_update_begin(&secy_stats->syncp);
1001 secy_stats->stats.InPktsUntagged++;
1002 u64_stats_update_end(&secy_stats->syncp);
1003 } else {
1004 macsec->secy.netdev->stats.rx_dropped++;
1005 }
1006 }
1007
1008 rcu_read_unlock();
1009 }
1010
1011 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1012 {
1013 struct sk_buff *skb = *pskb;
1014 struct net_device *dev = skb->dev;
1015 struct macsec_eth_header *hdr;
1016 struct macsec_secy *secy = NULL;
1017 struct macsec_rx_sc *rx_sc;
1018 struct macsec_rx_sa *rx_sa;
1019 struct macsec_rxh_data *rxd;
1020 struct macsec_dev *macsec;
1021 sci_t sci;
1022 u32 pn;
1023 bool cbit;
1024 struct pcpu_rx_sc_stats *rxsc_stats;
1025 struct pcpu_secy_stats *secy_stats;
1026 bool pulled_sci;
1027
1028 if (skb_headroom(skb) < ETH_HLEN)
1029 goto drop_direct;
1030
1031 hdr = macsec_ethhdr(skb);
1032 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1033 handle_not_macsec(skb);
1034
1035 /* and deliver to the uncontrolled port */
1036 return RX_HANDLER_PASS;
1037 }
1038
1039 skb = skb_unshare(skb, GFP_ATOMIC);
1040 if (!skb) {
1041 *pskb = NULL;
1042 return RX_HANDLER_CONSUMED;
1043 }
1044
1045 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1046 if (!pulled_sci) {
1047 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1048 goto drop_direct;
1049 }
1050
1051 hdr = macsec_ethhdr(skb);
1052
1053 /* Frames with a SecTAG that has the TCI E bit set but the C
1054 * bit clear are discarded, as this reserved encoding is used
1055 * to identify frames with a SecTAG that are not to be
1056 * delivered to the Controlled Port.
1057 */
1058 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1059 return RX_HANDLER_PASS;
1060
1061 /* now, pull the extra length */
1062 if (hdr->tci_an & MACSEC_TCI_SC) {
1063 if (!pulled_sci)
1064 goto drop_direct;
1065 }
1066
1067 /* ethernet header is part of crypto processing */
1068 skb_push(skb, ETH_HLEN);
1069
1070 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1071 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1072 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1073
1074 rcu_read_lock();
1075 rxd = macsec_data_rcu(skb->dev);
1076
1077 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1078 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1079
1080 if (sc) {
1081 secy = &macsec->secy;
1082 rx_sc = sc;
1083 break;
1084 }
1085 }
1086
1087 if (!secy)
1088 goto nosci;
1089
1090 dev = secy->netdev;
1091 macsec = macsec_priv(dev);
1092 secy_stats = this_cpu_ptr(macsec->stats);
1093 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1094
1095 if (!macsec_validate_skb(skb, secy->icv_len)) {
1096 u64_stats_update_begin(&secy_stats->syncp);
1097 secy_stats->stats.InPktsBadTag++;
1098 u64_stats_update_end(&secy_stats->syncp);
1099 goto drop_nosa;
1100 }
1101
1102 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1103 if (!rx_sa) {
1104 /* 10.6.1 if the SA is not in use */
1105
1106 /* If validateFrames is Strict or the C bit in the
1107 * SecTAG is set, discard
1108 */
1109 if (hdr->tci_an & MACSEC_TCI_C ||
1110 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1111 u64_stats_update_begin(&rxsc_stats->syncp);
1112 rxsc_stats->stats.InPktsNotUsingSA++;
1113 u64_stats_update_end(&rxsc_stats->syncp);
1114 goto drop_nosa;
1115 }
1116
1117 /* not Strict, the frame (with the SecTAG and ICV
1118 * removed) is delivered to the Controlled Port.
1119 */
1120 u64_stats_update_begin(&rxsc_stats->syncp);
1121 rxsc_stats->stats.InPktsUnusedSA++;
1122 u64_stats_update_end(&rxsc_stats->syncp);
1123 goto deliver;
1124 }
1125
1126 /* First, PN check to avoid decrypting obviously wrong packets */
1127 pn = ntohl(hdr->packet_number);
1128 if (secy->replay_protect) {
1129 bool late;
1130
1131 spin_lock(&rx_sa->lock);
1132 late = rx_sa->next_pn >= secy->replay_window &&
1133 pn < (rx_sa->next_pn - secy->replay_window);
1134 spin_unlock(&rx_sa->lock);
1135
1136 if (late) {
1137 u64_stats_update_begin(&rxsc_stats->syncp);
1138 rxsc_stats->stats.InPktsLate++;
1139 u64_stats_update_end(&rxsc_stats->syncp);
1140 goto drop;
1141 }
1142 }
1143
1144 /* Disabled && !changed text => skip validation */
1145 if (hdr->tci_an & MACSEC_TCI_C ||
1146 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1147 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1148
1149 if (IS_ERR(skb)) {
1150 /* the decrypt callback needs the reference */
1151 if (PTR_ERR(skb) != -EINPROGRESS)
1152 macsec_rxsa_put(rx_sa);
1153 rcu_read_unlock();
1154 *pskb = NULL;
1155 return RX_HANDLER_CONSUMED;
1156 }
1157
1158 if (!macsec_post_decrypt(skb, secy, pn))
1159 goto drop;
1160
1161 deliver:
1162 macsec_finalize_skb(skb, secy->icv_len,
1163 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1164 macsec_reset_skb(skb, secy->netdev);
1165
1166 if (rx_sa)
1167 macsec_rxsa_put(rx_sa);
1168 count_rx(dev, skb->len);
1169
1170 rcu_read_unlock();
1171
1172 *pskb = skb;
1173 return RX_HANDLER_ANOTHER;
1174
1175 drop:
1176 macsec_rxsa_put(rx_sa);
1177 drop_nosa:
1178 rcu_read_unlock();
1179 drop_direct:
1180 kfree_skb(skb);
1181 *pskb = NULL;
1182 return RX_HANDLER_CONSUMED;
1183
1184 nosci:
1185 /* 10.6.1 if the SC is not found */
1186 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1187 if (!cbit)
1188 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1189 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1190
1191 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1192 struct sk_buff *nskb;
1193 int ret;
1194
1195 secy_stats = this_cpu_ptr(macsec->stats);
1196
1197 /* If validateFrames is Strict or the C bit in the
1198 * SecTAG is set, discard
1199 */
1200 if (cbit ||
1201 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1202 u64_stats_update_begin(&secy_stats->syncp);
1203 secy_stats->stats.InPktsNoSCI++;
1204 u64_stats_update_end(&secy_stats->syncp);
1205 continue;
1206 }
1207
1208 /* not strict, the frame (with the SecTAG and ICV
1209 * removed) is delivered to the Controlled Port.
1210 */
1211 nskb = skb_clone(skb, GFP_ATOMIC);
1212 if (!nskb)
1213 break;
1214
1215 macsec_reset_skb(nskb, macsec->secy.netdev);
1216
1217 ret = netif_rx(nskb);
1218 if (ret == NET_RX_SUCCESS) {
1219 u64_stats_update_begin(&secy_stats->syncp);
1220 secy_stats->stats.InPktsUnknownSCI++;
1221 u64_stats_update_end(&secy_stats->syncp);
1222 } else {
1223 macsec->secy.netdev->stats.rx_dropped++;
1224 }
1225 }
1226
1227 rcu_read_unlock();
1228 *pskb = skb;
1229 return RX_HANDLER_PASS;
1230 }
1231
1232 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1233 {
1234 struct crypto_aead *tfm;
1235 int ret;
1236
1237 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
1238 if (!tfm || IS_ERR(tfm))
1239 return NULL;
1240
1241 ret = crypto_aead_setkey(tfm, key, key_len);
1242 if (ret < 0) {
1243 crypto_free_aead(tfm);
1244 return NULL;
1245 }
1246
1247 ret = crypto_aead_setauthsize(tfm, icv_len);
1248 if (ret < 0) {
1249 crypto_free_aead(tfm);
1250 return NULL;
1251 }
1252
1253 return tfm;
1254 }
1255
1256 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1257 int icv_len)
1258 {
1259 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1260 if (!rx_sa->stats)
1261 return -1;
1262
1263 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1264 if (!rx_sa->key.tfm) {
1265 free_percpu(rx_sa->stats);
1266 return -1;
1267 }
1268
1269 rx_sa->active = false;
1270 rx_sa->next_pn = 1;
1271 atomic_set(&rx_sa->refcnt, 1);
1272 spin_lock_init(&rx_sa->lock);
1273
1274 return 0;
1275 }
1276
1277 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1278 {
1279 rx_sa->active = false;
1280
1281 macsec_rxsa_put(rx_sa);
1282 }
1283
1284 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1285 {
1286 int i;
1287
1288 for (i = 0; i < MACSEC_NUM_AN; i++) {
1289 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1290
1291 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1292 if (sa)
1293 clear_rx_sa(sa);
1294 }
1295
1296 macsec_rxsc_put(rx_sc);
1297 }
1298
1299 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1300 {
1301 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1302
1303 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1304 rx_sc;
1305 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1306 if (rx_sc->sci == sci) {
1307 if (rx_sc->active)
1308 secy->n_rx_sc--;
1309 rcu_assign_pointer(*rx_scp, rx_sc->next);
1310 return rx_sc;
1311 }
1312 }
1313
1314 return NULL;
1315 }
1316
1317 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1318 {
1319 struct macsec_rx_sc *rx_sc;
1320 struct macsec_dev *macsec;
1321 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1322 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1323 struct macsec_secy *secy;
1324
1325 list_for_each_entry(macsec, &rxd->secys, secys) {
1326 if (find_rx_sc_rtnl(&macsec->secy, sci))
1327 return ERR_PTR(-EEXIST);
1328 }
1329
1330 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1331 if (!rx_sc)
1332 return ERR_PTR(-ENOMEM);
1333
1334 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1335 if (!rx_sc->stats) {
1336 kfree(rx_sc);
1337 return ERR_PTR(-ENOMEM);
1338 }
1339
1340 rx_sc->sci = sci;
1341 rx_sc->active = true;
1342 atomic_set(&rx_sc->refcnt, 1);
1343
1344 secy = &macsec_priv(dev)->secy;
1345 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1346 rcu_assign_pointer(secy->rx_sc, rx_sc);
1347
1348 if (rx_sc->active)
1349 secy->n_rx_sc++;
1350
1351 return rx_sc;
1352 }
1353
1354 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1355 int icv_len)
1356 {
1357 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1358 if (!tx_sa->stats)
1359 return -1;
1360
1361 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1362 if (!tx_sa->key.tfm) {
1363 free_percpu(tx_sa->stats);
1364 return -1;
1365 }
1366
1367 tx_sa->active = false;
1368 atomic_set(&tx_sa->refcnt, 1);
1369 spin_lock_init(&tx_sa->lock);
1370
1371 return 0;
1372 }
1373
1374 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1375 {
1376 tx_sa->active = false;
1377
1378 macsec_txsa_put(tx_sa);
1379 }
1380
1381 static struct genl_family macsec_fam = {
1382 .id = GENL_ID_GENERATE,
1383 .name = MACSEC_GENL_NAME,
1384 .hdrsize = 0,
1385 .version = MACSEC_GENL_VERSION,
1386 .maxattr = MACSEC_ATTR_MAX,
1387 .netnsok = true,
1388 };
1389
1390 static struct net_device *get_dev_from_nl(struct net *net,
1391 struct nlattr **attrs)
1392 {
1393 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1394 struct net_device *dev;
1395
1396 dev = __dev_get_by_index(net, ifindex);
1397 if (!dev)
1398 return ERR_PTR(-ENODEV);
1399
1400 if (!netif_is_macsec(dev))
1401 return ERR_PTR(-ENODEV);
1402
1403 return dev;
1404 }
1405
1406 static sci_t nla_get_sci(const struct nlattr *nla)
1407 {
1408 return (__force sci_t)nla_get_u64(nla);
1409 }
1410
1411 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value)
1412 {
1413 return nla_put_u64(skb, attrtype, (__force u64)value);
1414 }
1415
1416 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1417 struct nlattr **attrs,
1418 struct nlattr **tb_sa,
1419 struct net_device **devp,
1420 struct macsec_secy **secyp,
1421 struct macsec_tx_sc **scp,
1422 u8 *assoc_num)
1423 {
1424 struct net_device *dev;
1425 struct macsec_secy *secy;
1426 struct macsec_tx_sc *tx_sc;
1427 struct macsec_tx_sa *tx_sa;
1428
1429 if (!tb_sa[MACSEC_SA_ATTR_AN])
1430 return ERR_PTR(-EINVAL);
1431
1432 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1433
1434 dev = get_dev_from_nl(net, attrs);
1435 if (IS_ERR(dev))
1436 return ERR_CAST(dev);
1437
1438 if (*assoc_num >= MACSEC_NUM_AN)
1439 return ERR_PTR(-EINVAL);
1440
1441 secy = &macsec_priv(dev)->secy;
1442 tx_sc = &secy->tx_sc;
1443
1444 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1445 if (!tx_sa)
1446 return ERR_PTR(-ENODEV);
1447
1448 *devp = dev;
1449 *scp = tx_sc;
1450 *secyp = secy;
1451 return tx_sa;
1452 }
1453
1454 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1455 struct nlattr **attrs,
1456 struct nlattr **tb_rxsc,
1457 struct net_device **devp,
1458 struct macsec_secy **secyp)
1459 {
1460 struct net_device *dev;
1461 struct macsec_secy *secy;
1462 struct macsec_rx_sc *rx_sc;
1463 sci_t sci;
1464
1465 dev = get_dev_from_nl(net, attrs);
1466 if (IS_ERR(dev))
1467 return ERR_CAST(dev);
1468
1469 secy = &macsec_priv(dev)->secy;
1470
1471 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1472 return ERR_PTR(-EINVAL);
1473
1474 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1475 rx_sc = find_rx_sc_rtnl(secy, sci);
1476 if (!rx_sc)
1477 return ERR_PTR(-ENODEV);
1478
1479 *secyp = secy;
1480 *devp = dev;
1481
1482 return rx_sc;
1483 }
1484
1485 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1486 struct nlattr **attrs,
1487 struct nlattr **tb_rxsc,
1488 struct nlattr **tb_sa,
1489 struct net_device **devp,
1490 struct macsec_secy **secyp,
1491 struct macsec_rx_sc **scp,
1492 u8 *assoc_num)
1493 {
1494 struct macsec_rx_sc *rx_sc;
1495 struct macsec_rx_sa *rx_sa;
1496
1497 if (!tb_sa[MACSEC_SA_ATTR_AN])
1498 return ERR_PTR(-EINVAL);
1499
1500 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1501 if (*assoc_num >= MACSEC_NUM_AN)
1502 return ERR_PTR(-EINVAL);
1503
1504 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1505 if (IS_ERR(rx_sc))
1506 return ERR_CAST(rx_sc);
1507
1508 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1509 if (!rx_sa)
1510 return ERR_PTR(-ENODEV);
1511
1512 *scp = rx_sc;
1513 return rx_sa;
1514 }
1515
1516
1517 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1518 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1519 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1520 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1521 };
1522
1523 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1524 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1525 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1526 };
1527
1528 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1529 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1530 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1531 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1532 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_U64 },
1533 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1534 .len = MACSEC_MAX_KEY_LEN, },
1535 };
1536
1537 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1538 {
1539 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1540 return -EINVAL;
1541
1542 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG],
1543 macsec_genl_sa_policy))
1544 return -EINVAL;
1545
1546 return 0;
1547 }
1548
1549 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1550 {
1551 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1552 return -EINVAL;
1553
1554 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG],
1555 macsec_genl_rxsc_policy))
1556 return -EINVAL;
1557
1558 return 0;
1559 }
1560
1561 static bool validate_add_rxsa(struct nlattr **attrs)
1562 {
1563 if (!attrs[MACSEC_SA_ATTR_AN] ||
1564 !attrs[MACSEC_SA_ATTR_KEY] ||
1565 !attrs[MACSEC_SA_ATTR_KEYID])
1566 return false;
1567
1568 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1569 return false;
1570
1571 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1572 return false;
1573
1574 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1575 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1576 return false;
1577 }
1578
1579 return true;
1580 }
1581
1582 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1583 {
1584 struct net_device *dev;
1585 struct nlattr **attrs = info->attrs;
1586 struct macsec_secy *secy;
1587 struct macsec_rx_sc *rx_sc;
1588 struct macsec_rx_sa *rx_sa;
1589 unsigned char assoc_num;
1590 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1591 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1592
1593 if (!attrs[MACSEC_ATTR_IFINDEX])
1594 return -EINVAL;
1595
1596 if (parse_sa_config(attrs, tb_sa))
1597 return -EINVAL;
1598
1599 if (parse_rxsc_config(attrs, tb_rxsc))
1600 return -EINVAL;
1601
1602 if (!validate_add_rxsa(tb_sa))
1603 return -EINVAL;
1604
1605 rtnl_lock();
1606 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1607 if (IS_ERR(rx_sc) || !macsec_rxsc_get(rx_sc)) {
1608 rtnl_unlock();
1609 return PTR_ERR(rx_sc);
1610 }
1611
1612 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1613
1614 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1615 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1616 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1617 rtnl_unlock();
1618 return -EINVAL;
1619 }
1620
1621 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1622 if (rx_sa) {
1623 rtnl_unlock();
1624 return -EBUSY;
1625 }
1626
1627 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1628 if (!rx_sa || init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1629 secy->key_len, secy->icv_len)) {
1630 kfree(rx_sa);
1631 rtnl_unlock();
1632 return -ENOMEM;
1633 }
1634
1635 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1636 spin_lock_bh(&rx_sa->lock);
1637 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1638 spin_unlock_bh(&rx_sa->lock);
1639 }
1640
1641 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1642 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1643
1644 rx_sa->key.id = nla_get_u64(tb_sa[MACSEC_SA_ATTR_KEYID]);
1645 rx_sa->sc = rx_sc;
1646 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1647
1648 rtnl_unlock();
1649
1650 return 0;
1651 }
1652
1653 static bool validate_add_rxsc(struct nlattr **attrs)
1654 {
1655 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1656 return false;
1657
1658 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1659 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1660 return false;
1661 }
1662
1663 return true;
1664 }
1665
1666 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1667 {
1668 struct net_device *dev;
1669 sci_t sci = MACSEC_UNDEF_SCI;
1670 struct nlattr **attrs = info->attrs;
1671 struct macsec_rx_sc *rx_sc;
1672 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1673
1674 if (!attrs[MACSEC_ATTR_IFINDEX])
1675 return -EINVAL;
1676
1677 if (parse_rxsc_config(attrs, tb_rxsc))
1678 return -EINVAL;
1679
1680 if (!validate_add_rxsc(tb_rxsc))
1681 return -EINVAL;
1682
1683 rtnl_lock();
1684 dev = get_dev_from_nl(genl_info_net(info), attrs);
1685 if (IS_ERR(dev)) {
1686 rtnl_unlock();
1687 return PTR_ERR(dev);
1688 }
1689
1690 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1691
1692 rx_sc = create_rx_sc(dev, sci);
1693 if (IS_ERR(rx_sc)) {
1694 rtnl_unlock();
1695 return PTR_ERR(rx_sc);
1696 }
1697
1698 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1699 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1700
1701 rtnl_unlock();
1702
1703 return 0;
1704 }
1705
1706 static bool validate_add_txsa(struct nlattr **attrs)
1707 {
1708 if (!attrs[MACSEC_SA_ATTR_AN] ||
1709 !attrs[MACSEC_SA_ATTR_PN] ||
1710 !attrs[MACSEC_SA_ATTR_KEY] ||
1711 !attrs[MACSEC_SA_ATTR_KEYID])
1712 return false;
1713
1714 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1715 return false;
1716
1717 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1718 return false;
1719
1720 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1721 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1722 return false;
1723 }
1724
1725 return true;
1726 }
1727
1728 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1729 {
1730 struct net_device *dev;
1731 struct nlattr **attrs = info->attrs;
1732 struct macsec_secy *secy;
1733 struct macsec_tx_sc *tx_sc;
1734 struct macsec_tx_sa *tx_sa;
1735 unsigned char assoc_num;
1736 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1737
1738 if (!attrs[MACSEC_ATTR_IFINDEX])
1739 return -EINVAL;
1740
1741 if (parse_sa_config(attrs, tb_sa))
1742 return -EINVAL;
1743
1744 if (!validate_add_txsa(tb_sa))
1745 return -EINVAL;
1746
1747 rtnl_lock();
1748 dev = get_dev_from_nl(genl_info_net(info), attrs);
1749 if (IS_ERR(dev)) {
1750 rtnl_unlock();
1751 return PTR_ERR(dev);
1752 }
1753
1754 secy = &macsec_priv(dev)->secy;
1755 tx_sc = &secy->tx_sc;
1756
1757 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1758
1759 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1760 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1761 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1762 rtnl_unlock();
1763 return -EINVAL;
1764 }
1765
1766 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1767 if (tx_sa) {
1768 rtnl_unlock();
1769 return -EBUSY;
1770 }
1771
1772 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1773 if (!tx_sa || init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1774 secy->key_len, secy->icv_len)) {
1775 kfree(tx_sa);
1776 rtnl_unlock();
1777 return -ENOMEM;
1778 }
1779
1780 tx_sa->key.id = nla_get_u64(tb_sa[MACSEC_SA_ATTR_KEYID]);
1781
1782 spin_lock_bh(&tx_sa->lock);
1783 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1784 spin_unlock_bh(&tx_sa->lock);
1785
1786 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1787 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1788
1789 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1790 secy->operational = true;
1791
1792 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1793
1794 rtnl_unlock();
1795
1796 return 0;
1797 }
1798
1799 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1800 {
1801 struct nlattr **attrs = info->attrs;
1802 struct net_device *dev;
1803 struct macsec_secy *secy;
1804 struct macsec_rx_sc *rx_sc;
1805 struct macsec_rx_sa *rx_sa;
1806 u8 assoc_num;
1807 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1808 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1809
1810 if (!attrs[MACSEC_ATTR_IFINDEX])
1811 return -EINVAL;
1812
1813 if (parse_sa_config(attrs, tb_sa))
1814 return -EINVAL;
1815
1816 if (parse_rxsc_config(attrs, tb_rxsc))
1817 return -EINVAL;
1818
1819 rtnl_lock();
1820 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1821 &dev, &secy, &rx_sc, &assoc_num);
1822 if (IS_ERR(rx_sa)) {
1823 rtnl_unlock();
1824 return PTR_ERR(rx_sa);
1825 }
1826
1827 if (rx_sa->active) {
1828 rtnl_unlock();
1829 return -EBUSY;
1830 }
1831
1832 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1833 clear_rx_sa(rx_sa);
1834
1835 rtnl_unlock();
1836
1837 return 0;
1838 }
1839
1840 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1841 {
1842 struct nlattr **attrs = info->attrs;
1843 struct net_device *dev;
1844 struct macsec_secy *secy;
1845 struct macsec_rx_sc *rx_sc;
1846 sci_t sci;
1847 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1848
1849 if (!attrs[MACSEC_ATTR_IFINDEX])
1850 return -EINVAL;
1851
1852 if (parse_rxsc_config(attrs, tb_rxsc))
1853 return -EINVAL;
1854
1855 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1856 return -EINVAL;
1857
1858 rtnl_lock();
1859 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1860 if (IS_ERR(dev)) {
1861 rtnl_unlock();
1862 return PTR_ERR(dev);
1863 }
1864
1865 secy = &macsec_priv(dev)->secy;
1866 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1867
1868 rx_sc = del_rx_sc(secy, sci);
1869 if (!rx_sc) {
1870 rtnl_unlock();
1871 return -ENODEV;
1872 }
1873
1874 free_rx_sc(rx_sc);
1875 rtnl_unlock();
1876
1877 return 0;
1878 }
1879
1880 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1881 {
1882 struct nlattr **attrs = info->attrs;
1883 struct net_device *dev;
1884 struct macsec_secy *secy;
1885 struct macsec_tx_sc *tx_sc;
1886 struct macsec_tx_sa *tx_sa;
1887 u8 assoc_num;
1888 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1889
1890 if (!attrs[MACSEC_ATTR_IFINDEX])
1891 return -EINVAL;
1892
1893 if (parse_sa_config(attrs, tb_sa))
1894 return -EINVAL;
1895
1896 rtnl_lock();
1897 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1898 &dev, &secy, &tx_sc, &assoc_num);
1899 if (IS_ERR(tx_sa)) {
1900 rtnl_unlock();
1901 return PTR_ERR(tx_sa);
1902 }
1903
1904 if (tx_sa->active) {
1905 rtnl_unlock();
1906 return -EBUSY;
1907 }
1908
1909 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
1910 clear_tx_sa(tx_sa);
1911
1912 rtnl_unlock();
1913
1914 return 0;
1915 }
1916
1917 static bool validate_upd_sa(struct nlattr **attrs)
1918 {
1919 if (!attrs[MACSEC_SA_ATTR_AN] ||
1920 attrs[MACSEC_SA_ATTR_KEY] ||
1921 attrs[MACSEC_SA_ATTR_KEYID])
1922 return false;
1923
1924 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1925 return false;
1926
1927 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1928 return false;
1929
1930 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1931 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1932 return false;
1933 }
1934
1935 return true;
1936 }
1937
1938 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
1939 {
1940 struct nlattr **attrs = info->attrs;
1941 struct net_device *dev;
1942 struct macsec_secy *secy;
1943 struct macsec_tx_sc *tx_sc;
1944 struct macsec_tx_sa *tx_sa;
1945 u8 assoc_num;
1946 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1947
1948 if (!attrs[MACSEC_ATTR_IFINDEX])
1949 return -EINVAL;
1950
1951 if (parse_sa_config(attrs, tb_sa))
1952 return -EINVAL;
1953
1954 if (!validate_upd_sa(tb_sa))
1955 return -EINVAL;
1956
1957 rtnl_lock();
1958 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1959 &dev, &secy, &tx_sc, &assoc_num);
1960 if (IS_ERR(tx_sa)) {
1961 rtnl_unlock();
1962 return PTR_ERR(tx_sa);
1963 }
1964
1965 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1966 spin_lock_bh(&tx_sa->lock);
1967 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1968 spin_unlock_bh(&tx_sa->lock);
1969 }
1970
1971 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1972 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1973
1974 if (assoc_num == tx_sc->encoding_sa)
1975 secy->operational = tx_sa->active;
1976
1977 rtnl_unlock();
1978
1979 return 0;
1980 }
1981
1982 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
1983 {
1984 struct nlattr **attrs = info->attrs;
1985 struct net_device *dev;
1986 struct macsec_secy *secy;
1987 struct macsec_rx_sc *rx_sc;
1988 struct macsec_rx_sa *rx_sa;
1989 u8 assoc_num;
1990 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1991 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1992
1993 if (!attrs[MACSEC_ATTR_IFINDEX])
1994 return -EINVAL;
1995
1996 if (parse_rxsc_config(attrs, tb_rxsc))
1997 return -EINVAL;
1998
1999 if (parse_sa_config(attrs, tb_sa))
2000 return -EINVAL;
2001
2002 if (!validate_upd_sa(tb_sa))
2003 return -EINVAL;
2004
2005 rtnl_lock();
2006 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2007 &dev, &secy, &rx_sc, &assoc_num);
2008 if (IS_ERR(rx_sa)) {
2009 rtnl_unlock();
2010 return PTR_ERR(rx_sa);
2011 }
2012
2013 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2014 spin_lock_bh(&rx_sa->lock);
2015 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2016 spin_unlock_bh(&rx_sa->lock);
2017 }
2018
2019 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2020 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2021
2022 rtnl_unlock();
2023 return 0;
2024 }
2025
2026 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2027 {
2028 struct nlattr **attrs = info->attrs;
2029 struct net_device *dev;
2030 struct macsec_secy *secy;
2031 struct macsec_rx_sc *rx_sc;
2032 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2033
2034 if (!attrs[MACSEC_ATTR_IFINDEX])
2035 return -EINVAL;
2036
2037 if (parse_rxsc_config(attrs, tb_rxsc))
2038 return -EINVAL;
2039
2040 if (!validate_add_rxsc(tb_rxsc))
2041 return -EINVAL;
2042
2043 rtnl_lock();
2044 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2045 if (IS_ERR(rx_sc)) {
2046 rtnl_unlock();
2047 return PTR_ERR(rx_sc);
2048 }
2049
2050 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2051 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2052
2053 if (rx_sc->active != new)
2054 secy->n_rx_sc += new ? 1 : -1;
2055
2056 rx_sc->active = new;
2057 }
2058
2059 rtnl_unlock();
2060
2061 return 0;
2062 }
2063
2064 static int copy_tx_sa_stats(struct sk_buff *skb,
2065 struct macsec_tx_sa_stats __percpu *pstats)
2066 {
2067 struct macsec_tx_sa_stats sum = {0, };
2068 int cpu;
2069
2070 for_each_possible_cpu(cpu) {
2071 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2072
2073 sum.OutPktsProtected += stats->OutPktsProtected;
2074 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2075 }
2076
2077 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2078 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2079 return -EMSGSIZE;
2080
2081 return 0;
2082 }
2083
2084 static int copy_rx_sa_stats(struct sk_buff *skb,
2085 struct macsec_rx_sa_stats __percpu *pstats)
2086 {
2087 struct macsec_rx_sa_stats sum = {0, };
2088 int cpu;
2089
2090 for_each_possible_cpu(cpu) {
2091 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2092
2093 sum.InPktsOK += stats->InPktsOK;
2094 sum.InPktsInvalid += stats->InPktsInvalid;
2095 sum.InPktsNotValid += stats->InPktsNotValid;
2096 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2097 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2098 }
2099
2100 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2101 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2102 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2103 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2104 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2105 return -EMSGSIZE;
2106
2107 return 0;
2108 }
2109
2110 static int copy_rx_sc_stats(struct sk_buff *skb,
2111 struct pcpu_rx_sc_stats __percpu *pstats)
2112 {
2113 struct macsec_rx_sc_stats sum = {0, };
2114 int cpu;
2115
2116 for_each_possible_cpu(cpu) {
2117 const struct pcpu_rx_sc_stats *stats;
2118 struct macsec_rx_sc_stats tmp;
2119 unsigned int start;
2120
2121 stats = per_cpu_ptr(pstats, cpu);
2122 do {
2123 start = u64_stats_fetch_begin_irq(&stats->syncp);
2124 memcpy(&tmp, &stats->stats, sizeof(tmp));
2125 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2126
2127 sum.InOctetsValidated += tmp.InOctetsValidated;
2128 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2129 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2130 sum.InPktsDelayed += tmp.InPktsDelayed;
2131 sum.InPktsOK += tmp.InPktsOK;
2132 sum.InPktsInvalid += tmp.InPktsInvalid;
2133 sum.InPktsLate += tmp.InPktsLate;
2134 sum.InPktsNotValid += tmp.InPktsNotValid;
2135 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2136 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2137 }
2138
2139 if (nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, sum.InOctetsValidated) ||
2140 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, sum.InOctetsDecrypted) ||
2141 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, sum.InPktsUnchecked) ||
2142 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, sum.InPktsDelayed) ||
2143 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2144 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2145 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, sum.InPktsLate) ||
2146 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2147 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2148 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2149 return -EMSGSIZE;
2150
2151 return 0;
2152 }
2153
2154 static int copy_tx_sc_stats(struct sk_buff *skb,
2155 struct pcpu_tx_sc_stats __percpu *pstats)
2156 {
2157 struct macsec_tx_sc_stats sum = {0, };
2158 int cpu;
2159
2160 for_each_possible_cpu(cpu) {
2161 const struct pcpu_tx_sc_stats *stats;
2162 struct macsec_tx_sc_stats tmp;
2163 unsigned int start;
2164
2165 stats = per_cpu_ptr(pstats, cpu);
2166 do {
2167 start = u64_stats_fetch_begin_irq(&stats->syncp);
2168 memcpy(&tmp, &stats->stats, sizeof(tmp));
2169 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2170
2171 sum.OutPktsProtected += tmp.OutPktsProtected;
2172 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2173 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2174 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2175 }
2176
2177 if (nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2178 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted) ||
2179 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, sum.OutOctetsProtected) ||
2180 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, sum.OutOctetsEncrypted))
2181 return -EMSGSIZE;
2182
2183 return 0;
2184 }
2185
2186 static int copy_secy_stats(struct sk_buff *skb,
2187 struct pcpu_secy_stats __percpu *pstats)
2188 {
2189 struct macsec_dev_stats sum = {0, };
2190 int cpu;
2191
2192 for_each_possible_cpu(cpu) {
2193 const struct pcpu_secy_stats *stats;
2194 struct macsec_dev_stats tmp;
2195 unsigned int start;
2196
2197 stats = per_cpu_ptr(pstats, cpu);
2198 do {
2199 start = u64_stats_fetch_begin_irq(&stats->syncp);
2200 memcpy(&tmp, &stats->stats, sizeof(tmp));
2201 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2202
2203 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2204 sum.InPktsUntagged += tmp.InPktsUntagged;
2205 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2206 sum.InPktsNoTag += tmp.InPktsNoTag;
2207 sum.InPktsBadTag += tmp.InPktsBadTag;
2208 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2209 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2210 sum.InPktsOverrun += tmp.InPktsOverrun;
2211 }
2212
2213 if (nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, sum.OutPktsUntagged) ||
2214 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, sum.InPktsUntagged) ||
2215 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, sum.OutPktsTooLong) ||
2216 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, sum.InPktsNoTag) ||
2217 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, sum.InPktsBadTag) ||
2218 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, sum.InPktsUnknownSCI) ||
2219 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, sum.InPktsNoSCI) ||
2220 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, sum.InPktsOverrun))
2221 return -EMSGSIZE;
2222
2223 return 0;
2224 }
2225
2226 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2227 {
2228 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2229 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2230
2231 if (!secy_nest)
2232 return 1;
2233
2234 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci) ||
2235 nla_put_u64(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2236 MACSEC_DEFAULT_CIPHER_ID) ||
2237 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2238 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2239 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2240 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2241 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2242 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2243 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2244 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2245 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2246 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2247 goto cancel;
2248
2249 if (secy->replay_protect) {
2250 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2251 goto cancel;
2252 }
2253
2254 nla_nest_end(skb, secy_nest);
2255 return 0;
2256
2257 cancel:
2258 nla_nest_cancel(skb, secy_nest);
2259 return 1;
2260 }
2261
2262 static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2263 struct sk_buff *skb, struct netlink_callback *cb)
2264 {
2265 struct macsec_rx_sc *rx_sc;
2266 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2267 struct nlattr *txsa_list, *rxsc_list;
2268 int i, j;
2269 void *hdr;
2270 struct nlattr *attr;
2271
2272 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2273 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2274 if (!hdr)
2275 return -EMSGSIZE;
2276
2277 genl_dump_check_consistent(cb, hdr, &macsec_fam);
2278
2279 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2280 goto nla_put_failure;
2281
2282 if (nla_put_secy(secy, skb))
2283 goto nla_put_failure;
2284
2285 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2286 if (!attr)
2287 goto nla_put_failure;
2288 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2289 nla_nest_cancel(skb, attr);
2290 goto nla_put_failure;
2291 }
2292 nla_nest_end(skb, attr);
2293
2294 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2295 if (!attr)
2296 goto nla_put_failure;
2297 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2298 nla_nest_cancel(skb, attr);
2299 goto nla_put_failure;
2300 }
2301 nla_nest_end(skb, attr);
2302
2303 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2304 if (!txsa_list)
2305 goto nla_put_failure;
2306 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2307 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2308 struct nlattr *txsa_nest;
2309
2310 if (!tx_sa)
2311 continue;
2312
2313 txsa_nest = nla_nest_start(skb, j++);
2314 if (!txsa_nest) {
2315 nla_nest_cancel(skb, txsa_list);
2316 goto nla_put_failure;
2317 }
2318
2319 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2320 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2321 nla_put_u64(skb, MACSEC_SA_ATTR_KEYID, tx_sa->key.id) ||
2322 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2323 nla_nest_cancel(skb, txsa_nest);
2324 nla_nest_cancel(skb, txsa_list);
2325 goto nla_put_failure;
2326 }
2327
2328 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2329 if (!attr) {
2330 nla_nest_cancel(skb, txsa_nest);
2331 nla_nest_cancel(skb, txsa_list);
2332 goto nla_put_failure;
2333 }
2334 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2335 nla_nest_cancel(skb, attr);
2336 nla_nest_cancel(skb, txsa_nest);
2337 nla_nest_cancel(skb, txsa_list);
2338 goto nla_put_failure;
2339 }
2340 nla_nest_end(skb, attr);
2341
2342 nla_nest_end(skb, txsa_nest);
2343 }
2344 nla_nest_end(skb, txsa_list);
2345
2346 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2347 if (!rxsc_list)
2348 goto nla_put_failure;
2349
2350 j = 1;
2351 for_each_rxsc_rtnl(secy, rx_sc) {
2352 int k;
2353 struct nlattr *rxsa_list;
2354 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2355
2356 if (!rxsc_nest) {
2357 nla_nest_cancel(skb, rxsc_list);
2358 goto nla_put_failure;
2359 }
2360
2361 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2362 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci)) {
2363 nla_nest_cancel(skb, rxsc_nest);
2364 nla_nest_cancel(skb, rxsc_list);
2365 goto nla_put_failure;
2366 }
2367
2368 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2369 if (!attr) {
2370 nla_nest_cancel(skb, rxsc_nest);
2371 nla_nest_cancel(skb, rxsc_list);
2372 goto nla_put_failure;
2373 }
2374 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2375 nla_nest_cancel(skb, attr);
2376 nla_nest_cancel(skb, rxsc_nest);
2377 nla_nest_cancel(skb, rxsc_list);
2378 goto nla_put_failure;
2379 }
2380 nla_nest_end(skb, attr);
2381
2382 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2383 if (!rxsa_list) {
2384 nla_nest_cancel(skb, rxsc_nest);
2385 nla_nest_cancel(skb, rxsc_list);
2386 goto nla_put_failure;
2387 }
2388
2389 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2390 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2391 struct nlattr *rxsa_nest;
2392
2393 if (!rx_sa)
2394 continue;
2395
2396 rxsa_nest = nla_nest_start(skb, k++);
2397 if (!rxsa_nest) {
2398 nla_nest_cancel(skb, rxsa_list);
2399 nla_nest_cancel(skb, rxsc_nest);
2400 nla_nest_cancel(skb, rxsc_list);
2401 goto nla_put_failure;
2402 }
2403
2404 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2405 if (!attr) {
2406 nla_nest_cancel(skb, rxsa_list);
2407 nla_nest_cancel(skb, rxsc_nest);
2408 nla_nest_cancel(skb, rxsc_list);
2409 goto nla_put_failure;
2410 }
2411 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2412 nla_nest_cancel(skb, attr);
2413 nla_nest_cancel(skb, rxsa_list);
2414 nla_nest_cancel(skb, rxsc_nest);
2415 nla_nest_cancel(skb, rxsc_list);
2416 goto nla_put_failure;
2417 }
2418 nla_nest_end(skb, attr);
2419
2420 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2421 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2422 nla_put_u64(skb, MACSEC_SA_ATTR_KEYID, rx_sa->key.id) ||
2423 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2424 nla_nest_cancel(skb, rxsa_nest);
2425 nla_nest_cancel(skb, rxsc_nest);
2426 nla_nest_cancel(skb, rxsc_list);
2427 goto nla_put_failure;
2428 }
2429 nla_nest_end(skb, rxsa_nest);
2430 }
2431
2432 nla_nest_end(skb, rxsa_list);
2433 nla_nest_end(skb, rxsc_nest);
2434 }
2435
2436 nla_nest_end(skb, rxsc_list);
2437
2438 genlmsg_end(skb, hdr);
2439
2440 return 0;
2441
2442 nla_put_failure:
2443 genlmsg_cancel(skb, hdr);
2444 return -EMSGSIZE;
2445 }
2446
2447 static int macsec_generation = 1; /* protected by RTNL */
2448
2449 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2450 {
2451 struct net *net = sock_net(skb->sk);
2452 struct net_device *dev;
2453 int dev_idx, d;
2454
2455 dev_idx = cb->args[0];
2456
2457 d = 0;
2458 rtnl_lock();
2459
2460 cb->seq = macsec_generation;
2461
2462 for_each_netdev(net, dev) {
2463 struct macsec_secy *secy;
2464
2465 if (d < dev_idx)
2466 goto next;
2467
2468 if (!netif_is_macsec(dev))
2469 goto next;
2470
2471 secy = &macsec_priv(dev)->secy;
2472 if (dump_secy(secy, dev, skb, cb) < 0)
2473 goto done;
2474 next:
2475 d++;
2476 }
2477
2478 done:
2479 rtnl_unlock();
2480 cb->args[0] = d;
2481 return skb->len;
2482 }
2483
2484 static const struct genl_ops macsec_genl_ops[] = {
2485 {
2486 .cmd = MACSEC_CMD_GET_TXSC,
2487 .dumpit = macsec_dump_txsc,
2488 .policy = macsec_genl_policy,
2489 },
2490 {
2491 .cmd = MACSEC_CMD_ADD_RXSC,
2492 .doit = macsec_add_rxsc,
2493 .policy = macsec_genl_policy,
2494 .flags = GENL_ADMIN_PERM,
2495 },
2496 {
2497 .cmd = MACSEC_CMD_DEL_RXSC,
2498 .doit = macsec_del_rxsc,
2499 .policy = macsec_genl_policy,
2500 .flags = GENL_ADMIN_PERM,
2501 },
2502 {
2503 .cmd = MACSEC_CMD_UPD_RXSC,
2504 .doit = macsec_upd_rxsc,
2505 .policy = macsec_genl_policy,
2506 .flags = GENL_ADMIN_PERM,
2507 },
2508 {
2509 .cmd = MACSEC_CMD_ADD_TXSA,
2510 .doit = macsec_add_txsa,
2511 .policy = macsec_genl_policy,
2512 .flags = GENL_ADMIN_PERM,
2513 },
2514 {
2515 .cmd = MACSEC_CMD_DEL_TXSA,
2516 .doit = macsec_del_txsa,
2517 .policy = macsec_genl_policy,
2518 .flags = GENL_ADMIN_PERM,
2519 },
2520 {
2521 .cmd = MACSEC_CMD_UPD_TXSA,
2522 .doit = macsec_upd_txsa,
2523 .policy = macsec_genl_policy,
2524 .flags = GENL_ADMIN_PERM,
2525 },
2526 {
2527 .cmd = MACSEC_CMD_ADD_RXSA,
2528 .doit = macsec_add_rxsa,
2529 .policy = macsec_genl_policy,
2530 .flags = GENL_ADMIN_PERM,
2531 },
2532 {
2533 .cmd = MACSEC_CMD_DEL_RXSA,
2534 .doit = macsec_del_rxsa,
2535 .policy = macsec_genl_policy,
2536 .flags = GENL_ADMIN_PERM,
2537 },
2538 {
2539 .cmd = MACSEC_CMD_UPD_RXSA,
2540 .doit = macsec_upd_rxsa,
2541 .policy = macsec_genl_policy,
2542 .flags = GENL_ADMIN_PERM,
2543 },
2544 };
2545
2546 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2547 struct net_device *dev)
2548 {
2549 struct macsec_dev *macsec = netdev_priv(dev);
2550 struct macsec_secy *secy = &macsec->secy;
2551 struct pcpu_secy_stats *secy_stats;
2552 int ret, len;
2553
2554 /* 10.5 */
2555 if (!secy->protect_frames) {
2556 secy_stats = this_cpu_ptr(macsec->stats);
2557 u64_stats_update_begin(&secy_stats->syncp);
2558 secy_stats->stats.OutPktsUntagged++;
2559 u64_stats_update_end(&secy_stats->syncp);
2560 len = skb->len;
2561 ret = dev_queue_xmit(skb);
2562 count_tx(dev, ret, len);
2563 return ret;
2564 }
2565
2566 if (!secy->operational) {
2567 kfree_skb(skb);
2568 dev->stats.tx_dropped++;
2569 return NETDEV_TX_OK;
2570 }
2571
2572 skb = macsec_encrypt(skb, dev);
2573 if (IS_ERR(skb)) {
2574 if (PTR_ERR(skb) != -EINPROGRESS)
2575 dev->stats.tx_dropped++;
2576 return NETDEV_TX_OK;
2577 }
2578
2579 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2580
2581 macsec_encrypt_finish(skb, dev);
2582 len = skb->len;
2583 ret = dev_queue_xmit(skb);
2584 count_tx(dev, ret, len);
2585 return ret;
2586 }
2587
2588 #define MACSEC_FEATURES \
2589 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2590 static int macsec_dev_init(struct net_device *dev)
2591 {
2592 struct macsec_dev *macsec = macsec_priv(dev);
2593 struct net_device *real_dev = macsec->real_dev;
2594
2595 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2596 if (!dev->tstats)
2597 return -ENOMEM;
2598
2599 dev->features = real_dev->features & MACSEC_FEATURES;
2600 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2601
2602 dev->needed_headroom = real_dev->needed_headroom +
2603 MACSEC_NEEDED_HEADROOM;
2604 dev->needed_tailroom = real_dev->needed_tailroom +
2605 MACSEC_NEEDED_TAILROOM;
2606
2607 if (is_zero_ether_addr(dev->dev_addr))
2608 eth_hw_addr_inherit(dev, real_dev);
2609 if (is_zero_ether_addr(dev->broadcast))
2610 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2611
2612 return 0;
2613 }
2614
2615 static void macsec_dev_uninit(struct net_device *dev)
2616 {
2617 free_percpu(dev->tstats);
2618 }
2619
2620 static netdev_features_t macsec_fix_features(struct net_device *dev,
2621 netdev_features_t features)
2622 {
2623 struct macsec_dev *macsec = macsec_priv(dev);
2624 struct net_device *real_dev = macsec->real_dev;
2625
2626 features &= real_dev->features & MACSEC_FEATURES;
2627 features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2628
2629 return features;
2630 }
2631
2632 static int macsec_dev_open(struct net_device *dev)
2633 {
2634 struct macsec_dev *macsec = macsec_priv(dev);
2635 struct net_device *real_dev = macsec->real_dev;
2636 int err;
2637
2638 if (!(real_dev->flags & IFF_UP))
2639 return -ENETDOWN;
2640
2641 err = dev_uc_add(real_dev, dev->dev_addr);
2642 if (err < 0)
2643 return err;
2644
2645 if (dev->flags & IFF_ALLMULTI) {
2646 err = dev_set_allmulti(real_dev, 1);
2647 if (err < 0)
2648 goto del_unicast;
2649 }
2650
2651 if (dev->flags & IFF_PROMISC) {
2652 err = dev_set_promiscuity(real_dev, 1);
2653 if (err < 0)
2654 goto clear_allmulti;
2655 }
2656
2657 if (netif_carrier_ok(real_dev))
2658 netif_carrier_on(dev);
2659
2660 return 0;
2661 clear_allmulti:
2662 if (dev->flags & IFF_ALLMULTI)
2663 dev_set_allmulti(real_dev, -1);
2664 del_unicast:
2665 dev_uc_del(real_dev, dev->dev_addr);
2666 netif_carrier_off(dev);
2667 return err;
2668 }
2669
2670 static int macsec_dev_stop(struct net_device *dev)
2671 {
2672 struct macsec_dev *macsec = macsec_priv(dev);
2673 struct net_device *real_dev = macsec->real_dev;
2674
2675 netif_carrier_off(dev);
2676
2677 dev_mc_unsync(real_dev, dev);
2678 dev_uc_unsync(real_dev, dev);
2679
2680 if (dev->flags & IFF_ALLMULTI)
2681 dev_set_allmulti(real_dev, -1);
2682
2683 if (dev->flags & IFF_PROMISC)
2684 dev_set_promiscuity(real_dev, -1);
2685
2686 dev_uc_del(real_dev, dev->dev_addr);
2687
2688 return 0;
2689 }
2690
2691 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2692 {
2693 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2694
2695 if (!(dev->flags & IFF_UP))
2696 return;
2697
2698 if (change & IFF_ALLMULTI)
2699 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2700
2701 if (change & IFF_PROMISC)
2702 dev_set_promiscuity(real_dev,
2703 dev->flags & IFF_PROMISC ? 1 : -1);
2704 }
2705
2706 static void macsec_dev_set_rx_mode(struct net_device *dev)
2707 {
2708 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2709
2710 dev_mc_sync(real_dev, dev);
2711 dev_uc_sync(real_dev, dev);
2712 }
2713
2714 static int macsec_set_mac_address(struct net_device *dev, void *p)
2715 {
2716 struct macsec_dev *macsec = macsec_priv(dev);
2717 struct net_device *real_dev = macsec->real_dev;
2718 struct sockaddr *addr = p;
2719 int err;
2720
2721 if (!is_valid_ether_addr(addr->sa_data))
2722 return -EADDRNOTAVAIL;
2723
2724 if (!(dev->flags & IFF_UP))
2725 goto out;
2726
2727 err = dev_uc_add(real_dev, addr->sa_data);
2728 if (err < 0)
2729 return err;
2730
2731 dev_uc_del(real_dev, dev->dev_addr);
2732
2733 out:
2734 ether_addr_copy(dev->dev_addr, addr->sa_data);
2735 return 0;
2736 }
2737
2738 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2739 {
2740 struct macsec_dev *macsec = macsec_priv(dev);
2741 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2742
2743 if (macsec->real_dev->mtu - extra < new_mtu)
2744 return -ERANGE;
2745
2746 dev->mtu = new_mtu;
2747
2748 return 0;
2749 }
2750
2751 static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev,
2752 struct rtnl_link_stats64 *s)
2753 {
2754 int cpu;
2755
2756 if (!dev->tstats)
2757 return s;
2758
2759 for_each_possible_cpu(cpu) {
2760 struct pcpu_sw_netstats *stats;
2761 struct pcpu_sw_netstats tmp;
2762 int start;
2763
2764 stats = per_cpu_ptr(dev->tstats, cpu);
2765 do {
2766 start = u64_stats_fetch_begin_irq(&stats->syncp);
2767 tmp.rx_packets = stats->rx_packets;
2768 tmp.rx_bytes = stats->rx_bytes;
2769 tmp.tx_packets = stats->tx_packets;
2770 tmp.tx_bytes = stats->tx_bytes;
2771 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2772
2773 s->rx_packets += tmp.rx_packets;
2774 s->rx_bytes += tmp.rx_bytes;
2775 s->tx_packets += tmp.tx_packets;
2776 s->tx_bytes += tmp.tx_bytes;
2777 }
2778
2779 s->rx_dropped = dev->stats.rx_dropped;
2780 s->tx_dropped = dev->stats.tx_dropped;
2781
2782 return s;
2783 }
2784
2785 static int macsec_get_iflink(const struct net_device *dev)
2786 {
2787 return macsec_priv(dev)->real_dev->ifindex;
2788 }
2789
2790 static const struct net_device_ops macsec_netdev_ops = {
2791 .ndo_init = macsec_dev_init,
2792 .ndo_uninit = macsec_dev_uninit,
2793 .ndo_open = macsec_dev_open,
2794 .ndo_stop = macsec_dev_stop,
2795 .ndo_fix_features = macsec_fix_features,
2796 .ndo_change_mtu = macsec_change_mtu,
2797 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2798 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2799 .ndo_set_mac_address = macsec_set_mac_address,
2800 .ndo_start_xmit = macsec_start_xmit,
2801 .ndo_get_stats64 = macsec_get_stats64,
2802 .ndo_get_iflink = macsec_get_iflink,
2803 };
2804
2805 static const struct device_type macsec_type = {
2806 .name = "macsec",
2807 };
2808
2809 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2810 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2811 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2812 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2813 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2814 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2815 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2816 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
2817 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
2818 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
2819 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
2820 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
2821 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
2822 };
2823
2824 static void macsec_free_netdev(struct net_device *dev)
2825 {
2826 struct macsec_dev *macsec = macsec_priv(dev);
2827 struct net_device *real_dev = macsec->real_dev;
2828
2829 free_percpu(macsec->stats);
2830 free_percpu(macsec->secy.tx_sc.stats);
2831
2832 dev_put(real_dev);
2833 free_netdev(dev);
2834 }
2835
2836 static void macsec_setup(struct net_device *dev)
2837 {
2838 ether_setup(dev);
2839 dev->tx_queue_len = 0;
2840 dev->netdev_ops = &macsec_netdev_ops;
2841 dev->destructor = macsec_free_netdev;
2842
2843 eth_zero_addr(dev->broadcast);
2844 }
2845
2846 static void macsec_changelink_common(struct net_device *dev,
2847 struct nlattr *data[])
2848 {
2849 struct macsec_secy *secy;
2850 struct macsec_tx_sc *tx_sc;
2851
2852 secy = &macsec_priv(dev)->secy;
2853 tx_sc = &secy->tx_sc;
2854
2855 if (data[IFLA_MACSEC_ENCODING_SA]) {
2856 struct macsec_tx_sa *tx_sa;
2857
2858 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
2859 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
2860
2861 secy->operational = tx_sa && tx_sa->active;
2862 }
2863
2864 if (data[IFLA_MACSEC_WINDOW])
2865 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
2866
2867 if (data[IFLA_MACSEC_ENCRYPT])
2868 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
2869
2870 if (data[IFLA_MACSEC_PROTECT])
2871 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
2872
2873 if (data[IFLA_MACSEC_INC_SCI])
2874 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
2875
2876 if (data[IFLA_MACSEC_ES])
2877 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
2878
2879 if (data[IFLA_MACSEC_SCB])
2880 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
2881
2882 if (data[IFLA_MACSEC_REPLAY_PROTECT])
2883 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
2884
2885 if (data[IFLA_MACSEC_VALIDATION])
2886 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
2887 }
2888
2889 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
2890 struct nlattr *data[])
2891 {
2892 if (!data)
2893 return 0;
2894
2895 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
2896 data[IFLA_MACSEC_ICV_LEN] ||
2897 data[IFLA_MACSEC_SCI] ||
2898 data[IFLA_MACSEC_PORT])
2899 return -EINVAL;
2900
2901 macsec_changelink_common(dev, data);
2902
2903 return 0;
2904 }
2905
2906 static void macsec_del_dev(struct macsec_dev *macsec)
2907 {
2908 int i;
2909
2910 while (macsec->secy.rx_sc) {
2911 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
2912
2913 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
2914 free_rx_sc(rx_sc);
2915 }
2916
2917 for (i = 0; i < MACSEC_NUM_AN; i++) {
2918 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
2919
2920 if (sa) {
2921 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
2922 clear_tx_sa(sa);
2923 }
2924 }
2925 }
2926
2927 static void macsec_dellink(struct net_device *dev, struct list_head *head)
2928 {
2929 struct macsec_dev *macsec = macsec_priv(dev);
2930 struct net_device *real_dev = macsec->real_dev;
2931 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
2932
2933 macsec_generation++;
2934
2935 unregister_netdevice_queue(dev, head);
2936 list_del_rcu(&macsec->secys);
2937 if (list_empty(&rxd->secys)) {
2938 netdev_rx_handler_unregister(real_dev);
2939 kfree(rxd);
2940 }
2941
2942 macsec_del_dev(macsec);
2943 }
2944
2945 static int register_macsec_dev(struct net_device *real_dev,
2946 struct net_device *dev)
2947 {
2948 struct macsec_dev *macsec = macsec_priv(dev);
2949 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
2950
2951 if (!rxd) {
2952 int err;
2953
2954 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
2955 if (!rxd)
2956 return -ENOMEM;
2957
2958 INIT_LIST_HEAD(&rxd->secys);
2959
2960 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
2961 rxd);
2962 if (err < 0) {
2963 kfree(rxd);
2964 return err;
2965 }
2966 }
2967
2968 list_add_tail_rcu(&macsec->secys, &rxd->secys);
2969 return 0;
2970 }
2971
2972 static bool sci_exists(struct net_device *dev, sci_t sci)
2973 {
2974 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
2975 struct macsec_dev *macsec;
2976
2977 list_for_each_entry(macsec, &rxd->secys, secys) {
2978 if (macsec->secy.sci == sci)
2979 return true;
2980 }
2981
2982 return false;
2983 }
2984
2985 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
2986 {
2987 return make_sci(dev->dev_addr, port);
2988 }
2989
2990 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
2991 {
2992 struct macsec_dev *macsec = macsec_priv(dev);
2993 struct macsec_secy *secy = &macsec->secy;
2994
2995 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
2996 if (!macsec->stats)
2997 return -ENOMEM;
2998
2999 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3000 if (!secy->tx_sc.stats) {
3001 free_percpu(macsec->stats);
3002 return -ENOMEM;
3003 }
3004
3005 if (sci == MACSEC_UNDEF_SCI)
3006 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3007
3008 secy->netdev = dev;
3009 secy->operational = true;
3010 secy->key_len = DEFAULT_SAK_LEN;
3011 secy->icv_len = icv_len;
3012 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3013 secy->protect_frames = true;
3014 secy->replay_protect = false;
3015
3016 secy->sci = sci;
3017 secy->tx_sc.active = true;
3018 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3019 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3020 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3021 secy->tx_sc.end_station = false;
3022 secy->tx_sc.scb = false;
3023
3024 return 0;
3025 }
3026
3027 static int macsec_newlink(struct net *net, struct net_device *dev,
3028 struct nlattr *tb[], struct nlattr *data[])
3029 {
3030 struct macsec_dev *macsec = macsec_priv(dev);
3031 struct net_device *real_dev;
3032 int err;
3033 sci_t sci;
3034 u8 icv_len = DEFAULT_ICV_LEN;
3035 rx_handler_func_t *rx_handler;
3036
3037 if (!tb[IFLA_LINK])
3038 return -EINVAL;
3039 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3040 if (!real_dev)
3041 return -ENODEV;
3042
3043 dev->priv_flags |= IFF_MACSEC;
3044
3045 macsec->real_dev = real_dev;
3046
3047 if (data && data[IFLA_MACSEC_ICV_LEN])
3048 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3049 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3050
3051 rx_handler = rtnl_dereference(real_dev->rx_handler);
3052 if (rx_handler && rx_handler != macsec_handle_frame)
3053 return -EBUSY;
3054
3055 err = register_netdevice(dev);
3056 if (err < 0)
3057 return err;
3058
3059 /* need to be already registered so that ->init has run and
3060 * the MAC addr is set
3061 */
3062 if (data && data[IFLA_MACSEC_SCI])
3063 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3064 else if (data && data[IFLA_MACSEC_PORT])
3065 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3066 else
3067 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3068
3069 if (rx_handler && sci_exists(real_dev, sci)) {
3070 err = -EBUSY;
3071 goto unregister;
3072 }
3073
3074 err = macsec_add_dev(dev, sci, icv_len);
3075 if (err)
3076 goto unregister;
3077
3078 if (data)
3079 macsec_changelink_common(dev, data);
3080
3081 err = register_macsec_dev(real_dev, dev);
3082 if (err < 0)
3083 goto del_dev;
3084
3085 macsec_generation++;
3086
3087 dev_hold(real_dev);
3088
3089 return 0;
3090
3091 del_dev:
3092 macsec_del_dev(macsec);
3093 unregister:
3094 unregister_netdevice(dev);
3095 return err;
3096 }
3097
3098 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
3099 {
3100 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3101 u8 icv_len = DEFAULT_ICV_LEN;
3102 int flag;
3103 bool es, scb, sci;
3104
3105 if (!data)
3106 return 0;
3107
3108 if (data[IFLA_MACSEC_CIPHER_SUITE])
3109 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3110
3111 if (data[IFLA_MACSEC_ICV_LEN])
3112 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3113
3114 switch (csid) {
3115 case MACSEC_DEFAULT_CIPHER_ID:
3116 case MACSEC_DEFAULT_CIPHER_ALT:
3117 if (icv_len < MACSEC_MIN_ICV_LEN ||
3118 icv_len > MACSEC_MAX_ICV_LEN)
3119 return -EINVAL;
3120 break;
3121 default:
3122 return -EINVAL;
3123 }
3124
3125 if (data[IFLA_MACSEC_ENCODING_SA]) {
3126 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3127 return -EINVAL;
3128 }
3129
3130 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3131 flag < IFLA_MACSEC_VALIDATION;
3132 flag++) {
3133 if (data[flag]) {
3134 if (nla_get_u8(data[flag]) > 1)
3135 return -EINVAL;
3136 }
3137 }
3138
3139 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3140 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3141 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3142
3143 if ((sci && (scb || es)) || (scb && es))
3144 return -EINVAL;
3145
3146 if (data[IFLA_MACSEC_VALIDATION] &&
3147 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3148 return -EINVAL;
3149
3150 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3151 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3152 !data[IFLA_MACSEC_WINDOW])
3153 return -EINVAL;
3154
3155 return 0;
3156 }
3157
3158 static struct net *macsec_get_link_net(const struct net_device *dev)
3159 {
3160 return dev_net(macsec_priv(dev)->real_dev);
3161 }
3162
3163 static size_t macsec_get_size(const struct net_device *dev)
3164 {
3165 return 0 +
3166 nla_total_size(8) + /* SCI */
3167 nla_total_size(1) + /* ICV_LEN */
3168 nla_total_size(8) + /* CIPHER_SUITE */
3169 nla_total_size(4) + /* WINDOW */
3170 nla_total_size(1) + /* ENCODING_SA */
3171 nla_total_size(1) + /* ENCRYPT */
3172 nla_total_size(1) + /* PROTECT */
3173 nla_total_size(1) + /* INC_SCI */
3174 nla_total_size(1) + /* ES */
3175 nla_total_size(1) + /* SCB */
3176 nla_total_size(1) + /* REPLAY_PROTECT */
3177 nla_total_size(1) + /* VALIDATION */
3178 0;
3179 }
3180
3181 static int macsec_fill_info(struct sk_buff *skb,
3182 const struct net_device *dev)
3183 {
3184 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3185 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3186
3187 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci) ||
3188 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3189 nla_put_u64(skb, IFLA_MACSEC_CIPHER_SUITE,
3190 MACSEC_DEFAULT_CIPHER_ID) ||
3191 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3192 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3193 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3194 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3195 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3196 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3197 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3198 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3199 0)
3200 goto nla_put_failure;
3201
3202 if (secy->replay_protect) {
3203 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3204 goto nla_put_failure;
3205 }
3206
3207 return 0;
3208
3209 nla_put_failure:
3210 return -EMSGSIZE;
3211 }
3212
3213 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3214 .kind = "macsec",
3215 .priv_size = sizeof(struct macsec_dev),
3216 .maxtype = IFLA_MACSEC_MAX,
3217 .policy = macsec_rtnl_policy,
3218 .setup = macsec_setup,
3219 .validate = macsec_validate_attr,
3220 .newlink = macsec_newlink,
3221 .changelink = macsec_changelink,
3222 .dellink = macsec_dellink,
3223 .get_size = macsec_get_size,
3224 .fill_info = macsec_fill_info,
3225 .get_link_net = macsec_get_link_net,
3226 };
3227
3228 static bool is_macsec_master(struct net_device *dev)
3229 {
3230 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3231 }
3232
3233 static int macsec_notify(struct notifier_block *this, unsigned long event,
3234 void *ptr)
3235 {
3236 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3237 LIST_HEAD(head);
3238
3239 if (!is_macsec_master(real_dev))
3240 return NOTIFY_DONE;
3241
3242 switch (event) {
3243 case NETDEV_UNREGISTER: {
3244 struct macsec_dev *m, *n;
3245 struct macsec_rxh_data *rxd;
3246
3247 rxd = macsec_data_rtnl(real_dev);
3248 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3249 macsec_dellink(m->secy.netdev, &head);
3250 }
3251 unregister_netdevice_many(&head);
3252 break;
3253 }
3254 case NETDEV_CHANGEMTU: {
3255 struct macsec_dev *m;
3256 struct macsec_rxh_data *rxd;
3257
3258 rxd = macsec_data_rtnl(real_dev);
3259 list_for_each_entry(m, &rxd->secys, secys) {
3260 struct net_device *dev = m->secy.netdev;
3261 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3262 macsec_extra_len(true));
3263
3264 if (dev->mtu > mtu)
3265 dev_set_mtu(dev, mtu);
3266 }
3267 }
3268 }
3269
3270 return NOTIFY_OK;
3271 }
3272
3273 static struct notifier_block macsec_notifier = {
3274 .notifier_call = macsec_notify,
3275 };
3276
3277 static int __init macsec_init(void)
3278 {
3279 int err;
3280
3281 pr_info("MACsec IEEE 802.1AE\n");
3282 err = register_netdevice_notifier(&macsec_notifier);
3283 if (err)
3284 return err;
3285
3286 err = rtnl_link_register(&macsec_link_ops);
3287 if (err)
3288 goto notifier;
3289
3290 err = genl_register_family_with_ops(&macsec_fam, macsec_genl_ops);
3291 if (err)
3292 goto rtnl;
3293
3294 return 0;
3295
3296 rtnl:
3297 rtnl_link_unregister(&macsec_link_ops);
3298 notifier:
3299 unregister_netdevice_notifier(&macsec_notifier);
3300 return err;
3301 }
3302
3303 static void __exit macsec_exit(void)
3304 {
3305 genl_unregister_family(&macsec_fam);
3306 rtnl_link_unregister(&macsec_link_ops);
3307 unregister_netdevice_notifier(&macsec_notifier);
3308 }
3309
3310 module_init(macsec_init);
3311 module_exit(macsec_exit);
3312
3313 MODULE_ALIAS_RTNL_LINK("macsec");
3314
3315 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3316 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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