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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / net / macsec.c
blob84d3e5ca8817197a15165d2c61f8a0f58550c5b6
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 NULL;
884
885 req = aead_request_alloc(rx_sa->key.tfm, GFP_ATOMIC);
886 if (!req) {
887 kfree_skb(skb);
888 return NULL;
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 NULL;
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 NULL;
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 = NULL;
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 (!skb) {
1150 macsec_rxsa_put(rx_sa);
1151 rcu_read_unlock();
1152 *pskb = NULL;
1153 return RX_HANDLER_CONSUMED;
1154 }
1155
1156 if (!macsec_post_decrypt(skb, secy, pn))
1157 goto drop;
1158
1159 deliver:
1160 macsec_finalize_skb(skb, secy->icv_len,
1161 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1162 macsec_reset_skb(skb, secy->netdev);
1163
1164 macsec_rxsa_put(rx_sa);
1165 count_rx(dev, skb->len);
1166
1167 rcu_read_unlock();
1168
1169 *pskb = skb;
1170 return RX_HANDLER_ANOTHER;
1171
1172 drop:
1173 macsec_rxsa_put(rx_sa);
1174 drop_nosa:
1175 rcu_read_unlock();
1176 drop_direct:
1177 kfree_skb(skb);
1178 *pskb = NULL;
1179 return RX_HANDLER_CONSUMED;
1180
1181 nosci:
1182 /* 10.6.1 if the SC is not found */
1183 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1184 if (!cbit)
1185 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1186 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1187
1188 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1189 struct sk_buff *nskb;
1190 int ret;
1191
1192 secy_stats = this_cpu_ptr(macsec->stats);
1193
1194 /* If validateFrames is Strict or the C bit in the
1195 * SecTAG is set, discard
1196 */
1197 if (cbit ||
1198 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1199 u64_stats_update_begin(&secy_stats->syncp);
1200 secy_stats->stats.InPktsNoSCI++;
1201 u64_stats_update_end(&secy_stats->syncp);
1202 continue;
1203 }
1204
1205 /* not strict, the frame (with the SecTAG and ICV
1206 * removed) is delivered to the Controlled Port.
1207 */
1208 nskb = skb_clone(skb, GFP_ATOMIC);
1209 if (!nskb)
1210 break;
1211
1212 macsec_reset_skb(nskb, macsec->secy.netdev);
1213
1214 ret = netif_rx(nskb);
1215 if (ret == NET_RX_SUCCESS) {
1216 u64_stats_update_begin(&secy_stats->syncp);
1217 secy_stats->stats.InPktsUnknownSCI++;
1218 u64_stats_update_end(&secy_stats->syncp);
1219 } else {
1220 macsec->secy.netdev->stats.rx_dropped++;
1221 }
1222 }
1223
1224 rcu_read_unlock();
1225 *pskb = skb;
1226 return RX_HANDLER_PASS;
1227 }
1228
1229 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1230 {
1231 struct crypto_aead *tfm;
1232 int ret;
1233
1234 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
1235 if (!tfm || IS_ERR(tfm))
1236 return NULL;
1237
1238 ret = crypto_aead_setkey(tfm, key, key_len);
1239 if (ret < 0) {
1240 crypto_free_aead(tfm);
1241 return NULL;
1242 }
1243
1244 ret = crypto_aead_setauthsize(tfm, icv_len);
1245 if (ret < 0) {
1246 crypto_free_aead(tfm);
1247 return NULL;
1248 }
1249
1250 return tfm;
1251 }
1252
1253 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1254 int icv_len)
1255 {
1256 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1257 if (!rx_sa->stats)
1258 return -1;
1259
1260 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1261 if (!rx_sa->key.tfm) {
1262 free_percpu(rx_sa->stats);
1263 return -1;
1264 }
1265
1266 rx_sa->active = false;
1267 rx_sa->next_pn = 1;
1268 atomic_set(&rx_sa->refcnt, 1);
1269 spin_lock_init(&rx_sa->lock);
1270
1271 return 0;
1272 }
1273
1274 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1275 {
1276 rx_sa->active = false;
1277
1278 macsec_rxsa_put(rx_sa);
1279 }
1280
1281 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1282 {
1283 int i;
1284
1285 for (i = 0; i < MACSEC_NUM_AN; i++) {
1286 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1287
1288 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1289 if (sa)
1290 clear_rx_sa(sa);
1291 }
1292
1293 macsec_rxsc_put(rx_sc);
1294 }
1295
1296 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1297 {
1298 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1299
1300 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1301 rx_sc;
1302 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1303 if (rx_sc->sci == sci) {
1304 if (rx_sc->active)
1305 secy->n_rx_sc--;
1306 rcu_assign_pointer(*rx_scp, rx_sc->next);
1307 return rx_sc;
1308 }
1309 }
1310
1311 return NULL;
1312 }
1313
1314 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1315 {
1316 struct macsec_rx_sc *rx_sc;
1317 struct macsec_dev *macsec;
1318 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1319 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1320 struct macsec_secy *secy;
1321
1322 list_for_each_entry(macsec, &rxd->secys, secys) {
1323 if (find_rx_sc_rtnl(&macsec->secy, sci))
1324 return ERR_PTR(-EEXIST);
1325 }
1326
1327 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1328 if (!rx_sc)
1329 return ERR_PTR(-ENOMEM);
1330
1331 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1332 if (!rx_sc->stats) {
1333 kfree(rx_sc);
1334 return ERR_PTR(-ENOMEM);
1335 }
1336
1337 rx_sc->sci = sci;
1338 rx_sc->active = true;
1339 atomic_set(&rx_sc->refcnt, 1);
1340
1341 secy = &macsec_priv(dev)->secy;
1342 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1343 rcu_assign_pointer(secy->rx_sc, rx_sc);
1344
1345 if (rx_sc->active)
1346 secy->n_rx_sc++;
1347
1348 return rx_sc;
1349 }
1350
1351 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1352 int icv_len)
1353 {
1354 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1355 if (!tx_sa->stats)
1356 return -1;
1357
1358 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1359 if (!tx_sa->key.tfm) {
1360 free_percpu(tx_sa->stats);
1361 return -1;
1362 }
1363
1364 tx_sa->active = false;
1365 atomic_set(&tx_sa->refcnt, 1);
1366 spin_lock_init(&tx_sa->lock);
1367
1368 return 0;
1369 }
1370
1371 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1372 {
1373 tx_sa->active = false;
1374
1375 macsec_txsa_put(tx_sa);
1376 }
1377
1378 static struct genl_family macsec_fam = {
1379 .id = GENL_ID_GENERATE,
1380 .name = MACSEC_GENL_NAME,
1381 .hdrsize = 0,
1382 .version = MACSEC_GENL_VERSION,
1383 .maxattr = MACSEC_ATTR_MAX,
1384 .netnsok = true,
1385 };
1386
1387 static struct net_device *get_dev_from_nl(struct net *net,
1388 struct nlattr **attrs)
1389 {
1390 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1391 struct net_device *dev;
1392
1393 dev = __dev_get_by_index(net, ifindex);
1394 if (!dev)
1395 return ERR_PTR(-ENODEV);
1396
1397 if (!netif_is_macsec(dev))
1398 return ERR_PTR(-ENODEV);
1399
1400 return dev;
1401 }
1402
1403 static sci_t nla_get_sci(const struct nlattr *nla)
1404 {
1405 return (__force sci_t)nla_get_u64(nla);
1406 }
1407
1408 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value)
1409 {
1410 return nla_put_u64(skb, attrtype, (__force u64)value);
1411 }
1412
1413 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1414 struct nlattr **attrs,
1415 struct nlattr **tb_sa,
1416 struct net_device **devp,
1417 struct macsec_secy **secyp,
1418 struct macsec_tx_sc **scp,
1419 u8 *assoc_num)
1420 {
1421 struct net_device *dev;
1422 struct macsec_secy *secy;
1423 struct macsec_tx_sc *tx_sc;
1424 struct macsec_tx_sa *tx_sa;
1425
1426 if (!tb_sa[MACSEC_SA_ATTR_AN])
1427 return ERR_PTR(-EINVAL);
1428
1429 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1430
1431 dev = get_dev_from_nl(net, attrs);
1432 if (IS_ERR(dev))
1433 return ERR_CAST(dev);
1434
1435 if (*assoc_num >= MACSEC_NUM_AN)
1436 return ERR_PTR(-EINVAL);
1437
1438 secy = &macsec_priv(dev)->secy;
1439 tx_sc = &secy->tx_sc;
1440
1441 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1442 if (!tx_sa)
1443 return ERR_PTR(-ENODEV);
1444
1445 *devp = dev;
1446 *scp = tx_sc;
1447 *secyp = secy;
1448 return tx_sa;
1449 }
1450
1451 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1452 struct nlattr **attrs,
1453 struct nlattr **tb_rxsc,
1454 struct net_device **devp,
1455 struct macsec_secy **secyp)
1456 {
1457 struct net_device *dev;
1458 struct macsec_secy *secy;
1459 struct macsec_rx_sc *rx_sc;
1460 sci_t sci;
1461
1462 dev = get_dev_from_nl(net, attrs);
1463 if (IS_ERR(dev))
1464 return ERR_CAST(dev);
1465
1466 secy = &macsec_priv(dev)->secy;
1467
1468 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1469 return ERR_PTR(-EINVAL);
1470
1471 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1472 rx_sc = find_rx_sc_rtnl(secy, sci);
1473 if (!rx_sc)
1474 return ERR_PTR(-ENODEV);
1475
1476 *secyp = secy;
1477 *devp = dev;
1478
1479 return rx_sc;
1480 }
1481
1482 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1483 struct nlattr **attrs,
1484 struct nlattr **tb_rxsc,
1485 struct nlattr **tb_sa,
1486 struct net_device **devp,
1487 struct macsec_secy **secyp,
1488 struct macsec_rx_sc **scp,
1489 u8 *assoc_num)
1490 {
1491 struct macsec_rx_sc *rx_sc;
1492 struct macsec_rx_sa *rx_sa;
1493
1494 if (!tb_sa[MACSEC_SA_ATTR_AN])
1495 return ERR_PTR(-EINVAL);
1496
1497 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1498 if (*assoc_num >= MACSEC_NUM_AN)
1499 return ERR_PTR(-EINVAL);
1500
1501 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1502 if (IS_ERR(rx_sc))
1503 return ERR_CAST(rx_sc);
1504
1505 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1506 if (!rx_sa)
1507 return ERR_PTR(-ENODEV);
1508
1509 *scp = rx_sc;
1510 return rx_sa;
1511 }
1512
1513
1514 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1515 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1516 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1517 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1518 };
1519
1520 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1521 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1522 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1523 };
1524
1525 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1526 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1527 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1528 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1529 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_U64 },
1530 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1531 .len = MACSEC_MAX_KEY_LEN, },
1532 };
1533
1534 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1535 {
1536 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1537 return -EINVAL;
1538
1539 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG],
1540 macsec_genl_sa_policy))
1541 return -EINVAL;
1542
1543 return 0;
1544 }
1545
1546 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1547 {
1548 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1549 return -EINVAL;
1550
1551 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG],
1552 macsec_genl_rxsc_policy))
1553 return -EINVAL;
1554
1555 return 0;
1556 }
1557
1558 static bool validate_add_rxsa(struct nlattr **attrs)
1559 {
1560 if (!attrs[MACSEC_SA_ATTR_AN] ||
1561 !attrs[MACSEC_SA_ATTR_KEY] ||
1562 !attrs[MACSEC_SA_ATTR_KEYID])
1563 return false;
1564
1565 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1566 return false;
1567
1568 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1569 return false;
1570
1571 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1572 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1573 return false;
1574 }
1575
1576 return true;
1577 }
1578
1579 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1580 {
1581 struct net_device *dev;
1582 struct nlattr **attrs = info->attrs;
1583 struct macsec_secy *secy;
1584 struct macsec_rx_sc *rx_sc;
1585 struct macsec_rx_sa *rx_sa;
1586 unsigned char assoc_num;
1587 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1588 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1589
1590 if (!attrs[MACSEC_ATTR_IFINDEX])
1591 return -EINVAL;
1592
1593 if (parse_sa_config(attrs, tb_sa))
1594 return -EINVAL;
1595
1596 if (parse_rxsc_config(attrs, tb_rxsc))
1597 return -EINVAL;
1598
1599 if (!validate_add_rxsa(tb_sa))
1600 return -EINVAL;
1601
1602 rtnl_lock();
1603 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1604 if (IS_ERR(rx_sc) || !macsec_rxsc_get(rx_sc)) {
1605 rtnl_unlock();
1606 return PTR_ERR(rx_sc);
1607 }
1608
1609 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1610
1611 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1612 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1613 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1614 rtnl_unlock();
1615 return -EINVAL;
1616 }
1617
1618 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1619 if (rx_sa) {
1620 rtnl_unlock();
1621 return -EBUSY;
1622 }
1623
1624 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1625 if (init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len,
1626 secy->icv_len)) {
1627 rtnl_unlock();
1628 return -ENOMEM;
1629 }
1630
1631 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1632 spin_lock_bh(&rx_sa->lock);
1633 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1634 spin_unlock_bh(&rx_sa->lock);
1635 }
1636
1637 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1638 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1639
1640 rx_sa->key.id = nla_get_u64(tb_sa[MACSEC_SA_ATTR_KEYID]);
1641 rx_sa->sc = rx_sc;
1642 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1643
1644 rtnl_unlock();
1645
1646 return 0;
1647 }
1648
1649 static bool validate_add_rxsc(struct nlattr **attrs)
1650 {
1651 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1652 return false;
1653
1654 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1655 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1656 return false;
1657 }
1658
1659 return true;
1660 }
1661
1662 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1663 {
1664 struct net_device *dev;
1665 sci_t sci = MACSEC_UNDEF_SCI;
1666 struct nlattr **attrs = info->attrs;
1667 struct macsec_rx_sc *rx_sc;
1668 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1669
1670 if (!attrs[MACSEC_ATTR_IFINDEX])
1671 return -EINVAL;
1672
1673 if (parse_rxsc_config(attrs, tb_rxsc))
1674 return -EINVAL;
1675
1676 if (!validate_add_rxsc(tb_rxsc))
1677 return -EINVAL;
1678
1679 rtnl_lock();
1680 dev = get_dev_from_nl(genl_info_net(info), attrs);
1681 if (IS_ERR(dev)) {
1682 rtnl_unlock();
1683 return PTR_ERR(dev);
1684 }
1685
1686 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1687
1688 rx_sc = create_rx_sc(dev, sci);
1689 if (IS_ERR(rx_sc)) {
1690 rtnl_unlock();
1691 return PTR_ERR(rx_sc);
1692 }
1693
1694 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1695 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1696
1697 rtnl_unlock();
1698
1699 return 0;
1700 }
1701
1702 static bool validate_add_txsa(struct nlattr **attrs)
1703 {
1704 if (!attrs[MACSEC_SA_ATTR_AN] ||
1705 !attrs[MACSEC_SA_ATTR_PN] ||
1706 !attrs[MACSEC_SA_ATTR_KEY] ||
1707 !attrs[MACSEC_SA_ATTR_KEYID])
1708 return false;
1709
1710 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1711 return false;
1712
1713 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1714 return false;
1715
1716 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1717 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1718 return false;
1719 }
1720
1721 return true;
1722 }
1723
1724 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1725 {
1726 struct net_device *dev;
1727 struct nlattr **attrs = info->attrs;
1728 struct macsec_secy *secy;
1729 struct macsec_tx_sc *tx_sc;
1730 struct macsec_tx_sa *tx_sa;
1731 unsigned char assoc_num;
1732 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1733
1734 if (!attrs[MACSEC_ATTR_IFINDEX])
1735 return -EINVAL;
1736
1737 if (parse_sa_config(attrs, tb_sa))
1738 return -EINVAL;
1739
1740 if (!validate_add_txsa(tb_sa))
1741 return -EINVAL;
1742
1743 rtnl_lock();
1744 dev = get_dev_from_nl(genl_info_net(info), attrs);
1745 if (IS_ERR(dev)) {
1746 rtnl_unlock();
1747 return PTR_ERR(dev);
1748 }
1749
1750 secy = &macsec_priv(dev)->secy;
1751 tx_sc = &secy->tx_sc;
1752
1753 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1754
1755 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1756 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1757 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1758 rtnl_unlock();
1759 return -EINVAL;
1760 }
1761
1762 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1763 if (tx_sa) {
1764 rtnl_unlock();
1765 return -EBUSY;
1766 }
1767
1768 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1769 if (!tx_sa || init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1770 secy->key_len, secy->icv_len)) {
1771 rtnl_unlock();
1772 return -ENOMEM;
1773 }
1774
1775 tx_sa->key.id = nla_get_u64(tb_sa[MACSEC_SA_ATTR_KEYID]);
1776
1777 spin_lock_bh(&tx_sa->lock);
1778 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1779 spin_unlock_bh(&tx_sa->lock);
1780
1781 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1782 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1783
1784 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1785 secy->operational = true;
1786
1787 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1788
1789 rtnl_unlock();
1790
1791 return 0;
1792 }
1793
1794 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1795 {
1796 struct nlattr **attrs = info->attrs;
1797 struct net_device *dev;
1798 struct macsec_secy *secy;
1799 struct macsec_rx_sc *rx_sc;
1800 struct macsec_rx_sa *rx_sa;
1801 u8 assoc_num;
1802 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1803 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1804
1805 if (!attrs[MACSEC_ATTR_IFINDEX])
1806 return -EINVAL;
1807
1808 if (parse_sa_config(attrs, tb_sa))
1809 return -EINVAL;
1810
1811 if (parse_rxsc_config(attrs, tb_rxsc))
1812 return -EINVAL;
1813
1814 rtnl_lock();
1815 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1816 &dev, &secy, &rx_sc, &assoc_num);
1817 if (IS_ERR(rx_sa)) {
1818 rtnl_unlock();
1819 return PTR_ERR(rx_sa);
1820 }
1821
1822 if (rx_sa->active) {
1823 rtnl_unlock();
1824 return -EBUSY;
1825 }
1826
1827 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1828 clear_rx_sa(rx_sa);
1829
1830 rtnl_unlock();
1831
1832 return 0;
1833 }
1834
1835 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1836 {
1837 struct nlattr **attrs = info->attrs;
1838 struct net_device *dev;
1839 struct macsec_secy *secy;
1840 struct macsec_rx_sc *rx_sc;
1841 sci_t sci;
1842 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1843
1844 if (!attrs[MACSEC_ATTR_IFINDEX])
1845 return -EINVAL;
1846
1847 if (parse_rxsc_config(attrs, tb_rxsc))
1848 return -EINVAL;
1849
1850 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1851 return -EINVAL;
1852
1853 rtnl_lock();
1854 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1855 if (IS_ERR(dev)) {
1856 rtnl_unlock();
1857 return PTR_ERR(dev);
1858 }
1859
1860 secy = &macsec_priv(dev)->secy;
1861 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1862
1863 rx_sc = del_rx_sc(secy, sci);
1864 if (!rx_sc) {
1865 rtnl_unlock();
1866 return -ENODEV;
1867 }
1868
1869 free_rx_sc(rx_sc);
1870 rtnl_unlock();
1871
1872 return 0;
1873 }
1874
1875 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1876 {
1877 struct nlattr **attrs = info->attrs;
1878 struct net_device *dev;
1879 struct macsec_secy *secy;
1880 struct macsec_tx_sc *tx_sc;
1881 struct macsec_tx_sa *tx_sa;
1882 u8 assoc_num;
1883 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1884
1885 if (!attrs[MACSEC_ATTR_IFINDEX])
1886 return -EINVAL;
1887
1888 if (parse_sa_config(attrs, tb_sa))
1889 return -EINVAL;
1890
1891 rtnl_lock();
1892 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1893 &dev, &secy, &tx_sc, &assoc_num);
1894 if (IS_ERR(tx_sa)) {
1895 rtnl_unlock();
1896 return PTR_ERR(tx_sa);
1897 }
1898
1899 if (tx_sa->active) {
1900 rtnl_unlock();
1901 return -EBUSY;
1902 }
1903
1904 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
1905 clear_tx_sa(tx_sa);
1906
1907 rtnl_unlock();
1908
1909 return 0;
1910 }
1911
1912 static bool validate_upd_sa(struct nlattr **attrs)
1913 {
1914 if (!attrs[MACSEC_SA_ATTR_AN] ||
1915 attrs[MACSEC_SA_ATTR_KEY] ||
1916 attrs[MACSEC_SA_ATTR_KEYID])
1917 return false;
1918
1919 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1920 return false;
1921
1922 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1923 return false;
1924
1925 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1926 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1927 return false;
1928 }
1929
1930 return true;
1931 }
1932
1933 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
1934 {
1935 struct nlattr **attrs = info->attrs;
1936 struct net_device *dev;
1937 struct macsec_secy *secy;
1938 struct macsec_tx_sc *tx_sc;
1939 struct macsec_tx_sa *tx_sa;
1940 u8 assoc_num;
1941 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1942
1943 if (!attrs[MACSEC_ATTR_IFINDEX])
1944 return -EINVAL;
1945
1946 if (parse_sa_config(attrs, tb_sa))
1947 return -EINVAL;
1948
1949 if (!validate_upd_sa(tb_sa))
1950 return -EINVAL;
1951
1952 rtnl_lock();
1953 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1954 &dev, &secy, &tx_sc, &assoc_num);
1955 if (IS_ERR(tx_sa)) {
1956 rtnl_unlock();
1957 return PTR_ERR(tx_sa);
1958 }
1959
1960 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1961 spin_lock_bh(&tx_sa->lock);
1962 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1963 spin_unlock_bh(&tx_sa->lock);
1964 }
1965
1966 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1967 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1968
1969 if (assoc_num == tx_sc->encoding_sa)
1970 secy->operational = tx_sa->active;
1971
1972 rtnl_unlock();
1973
1974 return 0;
1975 }
1976
1977 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
1978 {
1979 struct nlattr **attrs = info->attrs;
1980 struct net_device *dev;
1981 struct macsec_secy *secy;
1982 struct macsec_rx_sc *rx_sc;
1983 struct macsec_rx_sa *rx_sa;
1984 u8 assoc_num;
1985 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1986 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1987
1988 if (!attrs[MACSEC_ATTR_IFINDEX])
1989 return -EINVAL;
1990
1991 if (parse_rxsc_config(attrs, tb_rxsc))
1992 return -EINVAL;
1993
1994 if (parse_sa_config(attrs, tb_sa))
1995 return -EINVAL;
1996
1997 if (!validate_upd_sa(tb_sa))
1998 return -EINVAL;
1999
2000 rtnl_lock();
2001 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2002 &dev, &secy, &rx_sc, &assoc_num);
2003 if (IS_ERR(rx_sa)) {
2004 rtnl_unlock();
2005 return PTR_ERR(rx_sa);
2006 }
2007
2008 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2009 spin_lock_bh(&rx_sa->lock);
2010 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2011 spin_unlock_bh(&rx_sa->lock);
2012 }
2013
2014 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2015 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2016
2017 rtnl_unlock();
2018 return 0;
2019 }
2020
2021 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2022 {
2023 struct nlattr **attrs = info->attrs;
2024 struct net_device *dev;
2025 struct macsec_secy *secy;
2026 struct macsec_rx_sc *rx_sc;
2027 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2028
2029 if (!attrs[MACSEC_ATTR_IFINDEX])
2030 return -EINVAL;
2031
2032 if (parse_rxsc_config(attrs, tb_rxsc))
2033 return -EINVAL;
2034
2035 if (!validate_add_rxsc(tb_rxsc))
2036 return -EINVAL;
2037
2038 rtnl_lock();
2039 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2040 if (IS_ERR(rx_sc)) {
2041 rtnl_unlock();
2042 return PTR_ERR(rx_sc);
2043 }
2044
2045 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2046 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2047
2048 if (rx_sc->active != new)
2049 secy->n_rx_sc += new ? 1 : -1;
2050
2051 rx_sc->active = new;
2052 }
2053
2054 rtnl_unlock();
2055
2056 return 0;
2057 }
2058
2059 static int copy_tx_sa_stats(struct sk_buff *skb,
2060 struct macsec_tx_sa_stats __percpu *pstats)
2061 {
2062 struct macsec_tx_sa_stats sum = {0, };
2063 int cpu;
2064
2065 for_each_possible_cpu(cpu) {
2066 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2067
2068 sum.OutPktsProtected += stats->OutPktsProtected;
2069 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2070 }
2071
2072 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2073 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2074 return -EMSGSIZE;
2075
2076 return 0;
2077 }
2078
2079 static int copy_rx_sa_stats(struct sk_buff *skb,
2080 struct macsec_rx_sa_stats __percpu *pstats)
2081 {
2082 struct macsec_rx_sa_stats sum = {0, };
2083 int cpu;
2084
2085 for_each_possible_cpu(cpu) {
2086 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2087
2088 sum.InPktsOK += stats->InPktsOK;
2089 sum.InPktsInvalid += stats->InPktsInvalid;
2090 sum.InPktsNotValid += stats->InPktsNotValid;
2091 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2092 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2093 }
2094
2095 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2096 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2097 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2098 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2099 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2100 return -EMSGSIZE;
2101
2102 return 0;
2103 }
2104
2105 static int copy_rx_sc_stats(struct sk_buff *skb,
2106 struct pcpu_rx_sc_stats __percpu *pstats)
2107 {
2108 struct macsec_rx_sc_stats sum = {0, };
2109 int cpu;
2110
2111 for_each_possible_cpu(cpu) {
2112 const struct pcpu_rx_sc_stats *stats;
2113 struct macsec_rx_sc_stats tmp;
2114 unsigned int start;
2115
2116 stats = per_cpu_ptr(pstats, cpu);
2117 do {
2118 start = u64_stats_fetch_begin_irq(&stats->syncp);
2119 memcpy(&tmp, &stats->stats, sizeof(tmp));
2120 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2121
2122 sum.InOctetsValidated += tmp.InOctetsValidated;
2123 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2124 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2125 sum.InPktsDelayed += tmp.InPktsDelayed;
2126 sum.InPktsOK += tmp.InPktsOK;
2127 sum.InPktsInvalid += tmp.InPktsInvalid;
2128 sum.InPktsLate += tmp.InPktsLate;
2129 sum.InPktsNotValid += tmp.InPktsNotValid;
2130 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2131 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2132 }
2133
2134 if (nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, sum.InOctetsValidated) ||
2135 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, sum.InOctetsDecrypted) ||
2136 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, sum.InPktsUnchecked) ||
2137 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, sum.InPktsDelayed) ||
2138 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2139 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2140 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, sum.InPktsLate) ||
2141 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2142 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2143 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2144 return -EMSGSIZE;
2145
2146 return 0;
2147 }
2148
2149 static int copy_tx_sc_stats(struct sk_buff *skb,
2150 struct pcpu_tx_sc_stats __percpu *pstats)
2151 {
2152 struct macsec_tx_sc_stats sum = {0, };
2153 int cpu;
2154
2155 for_each_possible_cpu(cpu) {
2156 const struct pcpu_tx_sc_stats *stats;
2157 struct macsec_tx_sc_stats tmp;
2158 unsigned int start;
2159
2160 stats = per_cpu_ptr(pstats, cpu);
2161 do {
2162 start = u64_stats_fetch_begin_irq(&stats->syncp);
2163 memcpy(&tmp, &stats->stats, sizeof(tmp));
2164 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2165
2166 sum.OutPktsProtected += tmp.OutPktsProtected;
2167 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2168 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2169 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2170 }
2171
2172 if (nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2173 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted) ||
2174 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, sum.OutOctetsProtected) ||
2175 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, sum.OutOctetsEncrypted))
2176 return -EMSGSIZE;
2177
2178 return 0;
2179 }
2180
2181 static int copy_secy_stats(struct sk_buff *skb,
2182 struct pcpu_secy_stats __percpu *pstats)
2183 {
2184 struct macsec_dev_stats sum = {0, };
2185 int cpu;
2186
2187 for_each_possible_cpu(cpu) {
2188 const struct pcpu_secy_stats *stats;
2189 struct macsec_dev_stats tmp;
2190 unsigned int start;
2191
2192 stats = per_cpu_ptr(pstats, cpu);
2193 do {
2194 start = u64_stats_fetch_begin_irq(&stats->syncp);
2195 memcpy(&tmp, &stats->stats, sizeof(tmp));
2196 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2197
2198 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2199 sum.InPktsUntagged += tmp.InPktsUntagged;
2200 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2201 sum.InPktsNoTag += tmp.InPktsNoTag;
2202 sum.InPktsBadTag += tmp.InPktsBadTag;
2203 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2204 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2205 sum.InPktsOverrun += tmp.InPktsOverrun;
2206 }
2207
2208 if (nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, sum.OutPktsUntagged) ||
2209 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, sum.InPktsUntagged) ||
2210 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, sum.OutPktsTooLong) ||
2211 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, sum.InPktsNoTag) ||
2212 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, sum.InPktsBadTag) ||
2213 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, sum.InPktsUnknownSCI) ||
2214 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, sum.InPktsNoSCI) ||
2215 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, sum.InPktsOverrun))
2216 return -EMSGSIZE;
2217
2218 return 0;
2219 }
2220
2221 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2222 {
2223 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2224 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2225
2226 if (!secy_nest)
2227 return 1;
2228
2229 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci) ||
2230 nla_put_u64(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, DEFAULT_CIPHER_ID) ||
2231 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2232 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2233 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2234 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2235 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2236 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2237 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2238 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2239 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2240 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2241 goto cancel;
2242
2243 if (secy->replay_protect) {
2244 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2245 goto cancel;
2246 }
2247
2248 nla_nest_end(skb, secy_nest);
2249 return 0;
2250
2251 cancel:
2252 nla_nest_cancel(skb, secy_nest);
2253 return 1;
2254 }
2255
2256 static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2257 struct sk_buff *skb, struct netlink_callback *cb)
2258 {
2259 struct macsec_rx_sc *rx_sc;
2260 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2261 struct nlattr *txsa_list, *rxsc_list;
2262 int i, j;
2263 void *hdr;
2264 struct nlattr *attr;
2265
2266 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2267 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2268 if (!hdr)
2269 return -EMSGSIZE;
2270
2271 rtnl_lock();
2272
2273 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2274 goto nla_put_failure;
2275
2276 if (nla_put_secy(secy, skb))
2277 goto nla_put_failure;
2278
2279 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2280 if (!attr)
2281 goto nla_put_failure;
2282 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2283 nla_nest_cancel(skb, attr);
2284 goto nla_put_failure;
2285 }
2286 nla_nest_end(skb, attr);
2287
2288 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2289 if (!attr)
2290 goto nla_put_failure;
2291 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2292 nla_nest_cancel(skb, attr);
2293 goto nla_put_failure;
2294 }
2295 nla_nest_end(skb, attr);
2296
2297 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2298 if (!txsa_list)
2299 goto nla_put_failure;
2300 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2301 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2302 struct nlattr *txsa_nest;
2303
2304 if (!tx_sa)
2305 continue;
2306
2307 txsa_nest = nla_nest_start(skb, j++);
2308 if (!txsa_nest) {
2309 nla_nest_cancel(skb, txsa_list);
2310 goto nla_put_failure;
2311 }
2312
2313 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2314 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2315 nla_put_u64(skb, MACSEC_SA_ATTR_KEYID, tx_sa->key.id) ||
2316 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2317 nla_nest_cancel(skb, txsa_nest);
2318 nla_nest_cancel(skb, txsa_list);
2319 goto nla_put_failure;
2320 }
2321
2322 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2323 if (!attr) {
2324 nla_nest_cancel(skb, txsa_nest);
2325 nla_nest_cancel(skb, txsa_list);
2326 goto nla_put_failure;
2327 }
2328 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2329 nla_nest_cancel(skb, attr);
2330 nla_nest_cancel(skb, txsa_nest);
2331 nla_nest_cancel(skb, txsa_list);
2332 goto nla_put_failure;
2333 }
2334 nla_nest_end(skb, attr);
2335
2336 nla_nest_end(skb, txsa_nest);
2337 }
2338 nla_nest_end(skb, txsa_list);
2339
2340 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2341 if (!rxsc_list)
2342 goto nla_put_failure;
2343
2344 j = 1;
2345 for_each_rxsc_rtnl(secy, rx_sc) {
2346 int k;
2347 struct nlattr *rxsa_list;
2348 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2349
2350 if (!rxsc_nest) {
2351 nla_nest_cancel(skb, rxsc_list);
2352 goto nla_put_failure;
2353 }
2354
2355 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2356 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci)) {
2357 nla_nest_cancel(skb, rxsc_nest);
2358 nla_nest_cancel(skb, rxsc_list);
2359 goto nla_put_failure;
2360 }
2361
2362 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2363 if (!attr) {
2364 nla_nest_cancel(skb, rxsc_nest);
2365 nla_nest_cancel(skb, rxsc_list);
2366 goto nla_put_failure;
2367 }
2368 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2369 nla_nest_cancel(skb, attr);
2370 nla_nest_cancel(skb, rxsc_nest);
2371 nla_nest_cancel(skb, rxsc_list);
2372 goto nla_put_failure;
2373 }
2374 nla_nest_end(skb, attr);
2375
2376 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2377 if (!rxsa_list) {
2378 nla_nest_cancel(skb, rxsc_nest);
2379 nla_nest_cancel(skb, rxsc_list);
2380 goto nla_put_failure;
2381 }
2382
2383 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2384 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2385 struct nlattr *rxsa_nest;
2386
2387 if (!rx_sa)
2388 continue;
2389
2390 rxsa_nest = nla_nest_start(skb, k++);
2391 if (!rxsa_nest) {
2392 nla_nest_cancel(skb, rxsa_list);
2393 nla_nest_cancel(skb, rxsc_nest);
2394 nla_nest_cancel(skb, rxsc_list);
2395 goto nla_put_failure;
2396 }
2397
2398 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2399 if (!attr) {
2400 nla_nest_cancel(skb, rxsa_list);
2401 nla_nest_cancel(skb, rxsc_nest);
2402 nla_nest_cancel(skb, rxsc_list);
2403 goto nla_put_failure;
2404 }
2405 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2406 nla_nest_cancel(skb, attr);
2407 nla_nest_cancel(skb, rxsa_list);
2408 nla_nest_cancel(skb, rxsc_nest);
2409 nla_nest_cancel(skb, rxsc_list);
2410 goto nla_put_failure;
2411 }
2412 nla_nest_end(skb, attr);
2413
2414 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2415 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2416 nla_put_u64(skb, MACSEC_SA_ATTR_KEYID, rx_sa->key.id) ||
2417 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2418 nla_nest_cancel(skb, rxsa_nest);
2419 nla_nest_cancel(skb, rxsc_nest);
2420 nla_nest_cancel(skb, rxsc_list);
2421 goto nla_put_failure;
2422 }
2423 nla_nest_end(skb, rxsa_nest);
2424 }
2425
2426 nla_nest_end(skb, rxsa_list);
2427 nla_nest_end(skb, rxsc_nest);
2428 }
2429
2430 nla_nest_end(skb, rxsc_list);
2431
2432 rtnl_unlock();
2433
2434 genlmsg_end(skb, hdr);
2435
2436 return 0;
2437
2438 nla_put_failure:
2439 rtnl_unlock();
2440 genlmsg_cancel(skb, hdr);
2441 return -EMSGSIZE;
2442 }
2443
2444 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2445 {
2446 struct net *net = sock_net(skb->sk);
2447 struct net_device *dev;
2448 int dev_idx, d;
2449
2450 dev_idx = cb->args[0];
2451
2452 d = 0;
2453 for_each_netdev(net, dev) {
2454 struct macsec_secy *secy;
2455
2456 if (d < dev_idx)
2457 goto next;
2458
2459 if (!netif_is_macsec(dev))
2460 goto next;
2461
2462 secy = &macsec_priv(dev)->secy;
2463 if (dump_secy(secy, dev, skb, cb) < 0)
2464 goto done;
2465 next:
2466 d++;
2467 }
2468
2469 done:
2470 cb->args[0] = d;
2471 return skb->len;
2472 }
2473
2474 static const struct genl_ops macsec_genl_ops[] = {
2475 {
2476 .cmd = MACSEC_CMD_GET_TXSC,
2477 .dumpit = macsec_dump_txsc,
2478 .policy = macsec_genl_policy,
2479 },
2480 {
2481 .cmd = MACSEC_CMD_ADD_RXSC,
2482 .doit = macsec_add_rxsc,
2483 .policy = macsec_genl_policy,
2484 .flags = GENL_ADMIN_PERM,
2485 },
2486 {
2487 .cmd = MACSEC_CMD_DEL_RXSC,
2488 .doit = macsec_del_rxsc,
2489 .policy = macsec_genl_policy,
2490 .flags = GENL_ADMIN_PERM,
2491 },
2492 {
2493 .cmd = MACSEC_CMD_UPD_RXSC,
2494 .doit = macsec_upd_rxsc,
2495 .policy = macsec_genl_policy,
2496 .flags = GENL_ADMIN_PERM,
2497 },
2498 {
2499 .cmd = MACSEC_CMD_ADD_TXSA,
2500 .doit = macsec_add_txsa,
2501 .policy = macsec_genl_policy,
2502 .flags = GENL_ADMIN_PERM,
2503 },
2504 {
2505 .cmd = MACSEC_CMD_DEL_TXSA,
2506 .doit = macsec_del_txsa,
2507 .policy = macsec_genl_policy,
2508 .flags = GENL_ADMIN_PERM,
2509 },
2510 {
2511 .cmd = MACSEC_CMD_UPD_TXSA,
2512 .doit = macsec_upd_txsa,
2513 .policy = macsec_genl_policy,
2514 .flags = GENL_ADMIN_PERM,
2515 },
2516 {
2517 .cmd = MACSEC_CMD_ADD_RXSA,
2518 .doit = macsec_add_rxsa,
2519 .policy = macsec_genl_policy,
2520 .flags = GENL_ADMIN_PERM,
2521 },
2522 {
2523 .cmd = MACSEC_CMD_DEL_RXSA,
2524 .doit = macsec_del_rxsa,
2525 .policy = macsec_genl_policy,
2526 .flags = GENL_ADMIN_PERM,
2527 },
2528 {
2529 .cmd = MACSEC_CMD_UPD_RXSA,
2530 .doit = macsec_upd_rxsa,
2531 .policy = macsec_genl_policy,
2532 .flags = GENL_ADMIN_PERM,
2533 },
2534 };
2535
2536 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2537 struct net_device *dev)
2538 {
2539 struct macsec_dev *macsec = netdev_priv(dev);
2540 struct macsec_secy *secy = &macsec->secy;
2541 struct pcpu_secy_stats *secy_stats;
2542 int ret, len;
2543
2544 /* 10.5 */
2545 if (!secy->protect_frames) {
2546 secy_stats = this_cpu_ptr(macsec->stats);
2547 u64_stats_update_begin(&secy_stats->syncp);
2548 secy_stats->stats.OutPktsUntagged++;
2549 u64_stats_update_end(&secy_stats->syncp);
2550 len = skb->len;
2551 ret = dev_queue_xmit(skb);
2552 count_tx(dev, ret, len);
2553 return ret;
2554 }
2555
2556 if (!secy->operational) {
2557 kfree_skb(skb);
2558 dev->stats.tx_dropped++;
2559 return NETDEV_TX_OK;
2560 }
2561
2562 skb = macsec_encrypt(skb, dev);
2563 if (IS_ERR(skb)) {
2564 if (PTR_ERR(skb) != -EINPROGRESS)
2565 dev->stats.tx_dropped++;
2566 return NETDEV_TX_OK;
2567 }
2568
2569 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2570
2571 macsec_encrypt_finish(skb, dev);
2572 len = skb->len;
2573 ret = dev_queue_xmit(skb);
2574 count_tx(dev, ret, len);
2575 return ret;
2576 }
2577
2578 #define MACSEC_FEATURES \
2579 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2580 static int macsec_dev_init(struct net_device *dev)
2581 {
2582 struct macsec_dev *macsec = macsec_priv(dev);
2583 struct net_device *real_dev = macsec->real_dev;
2584
2585 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2586 if (!dev->tstats)
2587 return -ENOMEM;
2588
2589 dev->features = real_dev->features & MACSEC_FEATURES;
2590 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2591
2592 dev->needed_headroom = real_dev->needed_headroom +
2593 MACSEC_NEEDED_HEADROOM;
2594 dev->needed_tailroom = real_dev->needed_tailroom +
2595 MACSEC_NEEDED_TAILROOM;
2596
2597 if (is_zero_ether_addr(dev->dev_addr))
2598 eth_hw_addr_inherit(dev, real_dev);
2599 if (is_zero_ether_addr(dev->broadcast))
2600 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2601
2602 return 0;
2603 }
2604
2605 static void macsec_dev_uninit(struct net_device *dev)
2606 {
2607 free_percpu(dev->tstats);
2608 }
2609
2610 static netdev_features_t macsec_fix_features(struct net_device *dev,
2611 netdev_features_t features)
2612 {
2613 struct macsec_dev *macsec = macsec_priv(dev);
2614 struct net_device *real_dev = macsec->real_dev;
2615
2616 features &= real_dev->features & MACSEC_FEATURES;
2617 features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2618
2619 return features;
2620 }
2621
2622 static int macsec_dev_open(struct net_device *dev)
2623 {
2624 struct macsec_dev *macsec = macsec_priv(dev);
2625 struct net_device *real_dev = macsec->real_dev;
2626 int err;
2627
2628 if (!(real_dev->flags & IFF_UP))
2629 return -ENETDOWN;
2630
2631 err = dev_uc_add(real_dev, dev->dev_addr);
2632 if (err < 0)
2633 return err;
2634
2635 if (dev->flags & IFF_ALLMULTI) {
2636 err = dev_set_allmulti(real_dev, 1);
2637 if (err < 0)
2638 goto del_unicast;
2639 }
2640
2641 if (dev->flags & IFF_PROMISC) {
2642 err = dev_set_promiscuity(real_dev, 1);
2643 if (err < 0)
2644 goto clear_allmulti;
2645 }
2646
2647 if (netif_carrier_ok(real_dev))
2648 netif_carrier_on(dev);
2649
2650 return 0;
2651 clear_allmulti:
2652 if (dev->flags & IFF_ALLMULTI)
2653 dev_set_allmulti(real_dev, -1);
2654 del_unicast:
2655 dev_uc_del(real_dev, dev->dev_addr);
2656 netif_carrier_off(dev);
2657 return err;
2658 }
2659
2660 static int macsec_dev_stop(struct net_device *dev)
2661 {
2662 struct macsec_dev *macsec = macsec_priv(dev);
2663 struct net_device *real_dev = macsec->real_dev;
2664
2665 netif_carrier_off(dev);
2666
2667 dev_mc_unsync(real_dev, dev);
2668 dev_uc_unsync(real_dev, dev);
2669
2670 if (dev->flags & IFF_ALLMULTI)
2671 dev_set_allmulti(real_dev, -1);
2672
2673 if (dev->flags & IFF_PROMISC)
2674 dev_set_promiscuity(real_dev, -1);
2675
2676 dev_uc_del(real_dev, dev->dev_addr);
2677
2678 return 0;
2679 }
2680
2681 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2682 {
2683 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2684
2685 if (!(dev->flags & IFF_UP))
2686 return;
2687
2688 if (change & IFF_ALLMULTI)
2689 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2690
2691 if (change & IFF_PROMISC)
2692 dev_set_promiscuity(real_dev,
2693 dev->flags & IFF_PROMISC ? 1 : -1);
2694 }
2695
2696 static void macsec_dev_set_rx_mode(struct net_device *dev)
2697 {
2698 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2699
2700 dev_mc_sync(real_dev, dev);
2701 dev_uc_sync(real_dev, dev);
2702 }
2703
2704 static int macsec_set_mac_address(struct net_device *dev, void *p)
2705 {
2706 struct macsec_dev *macsec = macsec_priv(dev);
2707 struct net_device *real_dev = macsec->real_dev;
2708 struct sockaddr *addr = p;
2709 int err;
2710
2711 if (!is_valid_ether_addr(addr->sa_data))
2712 return -EADDRNOTAVAIL;
2713
2714 if (!(dev->flags & IFF_UP))
2715 goto out;
2716
2717 err = dev_uc_add(real_dev, addr->sa_data);
2718 if (err < 0)
2719 return err;
2720
2721 dev_uc_del(real_dev, dev->dev_addr);
2722
2723 out:
2724 ether_addr_copy(dev->dev_addr, addr->sa_data);
2725 return 0;
2726 }
2727
2728 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2729 {
2730 struct macsec_dev *macsec = macsec_priv(dev);
2731 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2732
2733 if (macsec->real_dev->mtu - extra < new_mtu)
2734 return -ERANGE;
2735
2736 dev->mtu = new_mtu;
2737
2738 return 0;
2739 }
2740
2741 static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev,
2742 struct rtnl_link_stats64 *s)
2743 {
2744 int cpu;
2745
2746 if (!dev->tstats)
2747 return s;
2748
2749 for_each_possible_cpu(cpu) {
2750 struct pcpu_sw_netstats *stats;
2751 struct pcpu_sw_netstats tmp;
2752 int start;
2753
2754 stats = per_cpu_ptr(dev->tstats, cpu);
2755 do {
2756 start = u64_stats_fetch_begin_irq(&stats->syncp);
2757 tmp.rx_packets = stats->rx_packets;
2758 tmp.rx_bytes = stats->rx_bytes;
2759 tmp.tx_packets = stats->tx_packets;
2760 tmp.tx_bytes = stats->tx_bytes;
2761 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2762
2763 s->rx_packets += tmp.rx_packets;
2764 s->rx_bytes += tmp.rx_bytes;
2765 s->tx_packets += tmp.tx_packets;
2766 s->tx_bytes += tmp.tx_bytes;
2767 }
2768
2769 s->rx_dropped = dev->stats.rx_dropped;
2770 s->tx_dropped = dev->stats.tx_dropped;
2771
2772 return s;
2773 }
2774
2775 static int macsec_get_iflink(const struct net_device *dev)
2776 {
2777 return macsec_priv(dev)->real_dev->ifindex;
2778 }
2779
2780 static const struct net_device_ops macsec_netdev_ops = {
2781 .ndo_init = macsec_dev_init,
2782 .ndo_uninit = macsec_dev_uninit,
2783 .ndo_open = macsec_dev_open,
2784 .ndo_stop = macsec_dev_stop,
2785 .ndo_fix_features = macsec_fix_features,
2786 .ndo_change_mtu = macsec_change_mtu,
2787 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2788 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2789 .ndo_set_mac_address = macsec_set_mac_address,
2790 .ndo_start_xmit = macsec_start_xmit,
2791 .ndo_get_stats64 = macsec_get_stats64,
2792 .ndo_get_iflink = macsec_get_iflink,
2793 };
2794
2795 static const struct device_type macsec_type = {
2796 .name = "macsec",
2797 };
2798
2799 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2800 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2801 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2802 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2803 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2804 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2805 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2806 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
2807 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
2808 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
2809 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
2810 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
2811 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
2812 };
2813
2814 static void macsec_free_netdev(struct net_device *dev)
2815 {
2816 struct macsec_dev *macsec = macsec_priv(dev);
2817 struct net_device *real_dev = macsec->real_dev;
2818
2819 free_percpu(macsec->stats);
2820 free_percpu(macsec->secy.tx_sc.stats);
2821
2822 dev_put(real_dev);
2823 free_netdev(dev);
2824 }
2825
2826 static void macsec_setup(struct net_device *dev)
2827 {
2828 ether_setup(dev);
2829 dev->tx_queue_len = 0;
2830 dev->netdev_ops = &macsec_netdev_ops;
2831 dev->destructor = macsec_free_netdev;
2832
2833 eth_zero_addr(dev->broadcast);
2834 }
2835
2836 static void macsec_changelink_common(struct net_device *dev,
2837 struct nlattr *data[])
2838 {
2839 struct macsec_secy *secy;
2840 struct macsec_tx_sc *tx_sc;
2841
2842 secy = &macsec_priv(dev)->secy;
2843 tx_sc = &secy->tx_sc;
2844
2845 if (data[IFLA_MACSEC_ENCODING_SA]) {
2846 struct macsec_tx_sa *tx_sa;
2847
2848 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
2849 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
2850
2851 secy->operational = tx_sa && tx_sa->active;
2852 }
2853
2854 if (data[IFLA_MACSEC_WINDOW])
2855 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
2856
2857 if (data[IFLA_MACSEC_ENCRYPT])
2858 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
2859
2860 if (data[IFLA_MACSEC_PROTECT])
2861 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
2862
2863 if (data[IFLA_MACSEC_INC_SCI])
2864 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
2865
2866 if (data[IFLA_MACSEC_ES])
2867 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
2868
2869 if (data[IFLA_MACSEC_SCB])
2870 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
2871
2872 if (data[IFLA_MACSEC_REPLAY_PROTECT])
2873 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
2874
2875 if (data[IFLA_MACSEC_VALIDATION])
2876 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
2877 }
2878
2879 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
2880 struct nlattr *data[])
2881 {
2882 if (!data)
2883 return 0;
2884
2885 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
2886 data[IFLA_MACSEC_ICV_LEN] ||
2887 data[IFLA_MACSEC_SCI] ||
2888 data[IFLA_MACSEC_PORT])
2889 return -EINVAL;
2890
2891 macsec_changelink_common(dev, data);
2892
2893 return 0;
2894 }
2895
2896 static void macsec_del_dev(struct macsec_dev *macsec)
2897 {
2898 int i;
2899
2900 while (macsec->secy.rx_sc) {
2901 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
2902
2903 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
2904 free_rx_sc(rx_sc);
2905 }
2906
2907 for (i = 0; i < MACSEC_NUM_AN; i++) {
2908 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
2909
2910 if (sa) {
2911 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
2912 clear_tx_sa(sa);
2913 }
2914 }
2915 }
2916
2917 static void macsec_dellink(struct net_device *dev, struct list_head *head)
2918 {
2919 struct macsec_dev *macsec = macsec_priv(dev);
2920 struct net_device *real_dev = macsec->real_dev;
2921 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
2922
2923 unregister_netdevice_queue(dev, head);
2924 list_del_rcu(&macsec->secys);
2925 if (list_empty(&rxd->secys))
2926 netdev_rx_handler_unregister(real_dev);
2927
2928 macsec_del_dev(macsec);
2929 }
2930
2931 static int register_macsec_dev(struct net_device *real_dev,
2932 struct net_device *dev)
2933 {
2934 struct macsec_dev *macsec = macsec_priv(dev);
2935 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
2936
2937 if (!rxd) {
2938 int err;
2939
2940 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
2941 if (!rxd)
2942 return -ENOMEM;
2943
2944 INIT_LIST_HEAD(&rxd->secys);
2945
2946 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
2947 rxd);
2948 if (err < 0)
2949 return err;
2950 }
2951
2952 list_add_tail_rcu(&macsec->secys, &rxd->secys);
2953 return 0;
2954 }
2955
2956 static bool sci_exists(struct net_device *dev, sci_t sci)
2957 {
2958 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
2959 struct macsec_dev *macsec;
2960
2961 list_for_each_entry(macsec, &rxd->secys, secys) {
2962 if (macsec->secy.sci == sci)
2963 return true;
2964 }
2965
2966 return false;
2967 }
2968
2969 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
2970 {
2971 return make_sci(dev->dev_addr, port);
2972 }
2973
2974 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
2975 {
2976 struct macsec_dev *macsec = macsec_priv(dev);
2977 struct macsec_secy *secy = &macsec->secy;
2978
2979 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
2980 if (!macsec->stats)
2981 return -ENOMEM;
2982
2983 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
2984 if (!secy->tx_sc.stats) {
2985 free_percpu(macsec->stats);
2986 return -ENOMEM;
2987 }
2988
2989 if (sci == MACSEC_UNDEF_SCI)
2990 sci = dev_to_sci(dev, MACSEC_PORT_ES);
2991
2992 secy->netdev = dev;
2993 secy->operational = true;
2994 secy->key_len = DEFAULT_SAK_LEN;
2995 secy->icv_len = icv_len;
2996 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
2997 secy->protect_frames = true;
2998 secy->replay_protect = false;
2999
3000 secy->sci = sci;
3001 secy->tx_sc.active = true;
3002 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3003 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3004 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3005 secy->tx_sc.end_station = false;
3006 secy->tx_sc.scb = false;
3007
3008 return 0;
3009 }
3010
3011 static int macsec_newlink(struct net *net, struct net_device *dev,
3012 struct nlattr *tb[], struct nlattr *data[])
3013 {
3014 struct macsec_dev *macsec = macsec_priv(dev);
3015 struct net_device *real_dev;
3016 int err;
3017 sci_t sci;
3018 u8 icv_len = DEFAULT_ICV_LEN;
3019 rx_handler_func_t *rx_handler;
3020
3021 if (!tb[IFLA_LINK])
3022 return -EINVAL;
3023 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3024 if (!real_dev)
3025 return -ENODEV;
3026
3027 dev->priv_flags |= IFF_MACSEC;
3028
3029 macsec->real_dev = real_dev;
3030
3031 if (data && data[IFLA_MACSEC_ICV_LEN])
3032 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3033 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3034
3035 rx_handler = rtnl_dereference(real_dev->rx_handler);
3036 if (rx_handler && rx_handler != macsec_handle_frame)
3037 return -EBUSY;
3038
3039 err = register_netdevice(dev);
3040 if (err < 0)
3041 return err;
3042
3043 /* need to be already registered so that ->init has run and
3044 * the MAC addr is set
3045 */
3046 if (data && data[IFLA_MACSEC_SCI])
3047 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3048 else if (data && data[IFLA_MACSEC_PORT])
3049 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3050 else
3051 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3052
3053 if (rx_handler && sci_exists(real_dev, sci)) {
3054 err = -EBUSY;
3055 goto unregister;
3056 }
3057
3058 err = macsec_add_dev(dev, sci, icv_len);
3059 if (err)
3060 goto unregister;
3061
3062 if (data)
3063 macsec_changelink_common(dev, data);
3064
3065 err = register_macsec_dev(real_dev, dev);
3066 if (err < 0)
3067 goto del_dev;
3068
3069 dev_hold(real_dev);
3070
3071 return 0;
3072
3073 del_dev:
3074 macsec_del_dev(macsec);
3075 unregister:
3076 unregister_netdevice(dev);
3077 return err;
3078 }
3079
3080 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
3081 {
3082 u64 csid = DEFAULT_CIPHER_ID;
3083 u8 icv_len = DEFAULT_ICV_LEN;
3084 int flag;
3085 bool es, scb, sci;
3086
3087 if (!data)
3088 return 0;
3089
3090 if (data[IFLA_MACSEC_CIPHER_SUITE])
3091 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3092
3093 if (data[IFLA_MACSEC_ICV_LEN])
3094 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3095
3096 switch (csid) {
3097 case DEFAULT_CIPHER_ID:
3098 case DEFAULT_CIPHER_ALT:
3099 if (icv_len < MACSEC_MIN_ICV_LEN ||
3100 icv_len > MACSEC_MAX_ICV_LEN)
3101 return -EINVAL;
3102 break;
3103 default:
3104 return -EINVAL;
3105 }
3106
3107 if (data[IFLA_MACSEC_ENCODING_SA]) {
3108 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3109 return -EINVAL;
3110 }
3111
3112 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3113 flag < IFLA_MACSEC_VALIDATION;
3114 flag++) {
3115 if (data[flag]) {
3116 if (nla_get_u8(data[flag]) > 1)
3117 return -EINVAL;
3118 }
3119 }
3120
3121 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3122 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3123 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3124
3125 if ((sci && (scb || es)) || (scb && es))
3126 return -EINVAL;
3127
3128 if (data[IFLA_MACSEC_VALIDATION] &&
3129 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3130 return -EINVAL;
3131
3132 if ((data[IFLA_MACSEC_PROTECT] &&
3133 nla_get_u8(data[IFLA_MACSEC_PROTECT])) &&
3134 !data[IFLA_MACSEC_WINDOW])
3135 return -EINVAL;
3136
3137 return 0;
3138 }
3139
3140 static struct net *macsec_get_link_net(const struct net_device *dev)
3141 {
3142 return dev_net(macsec_priv(dev)->real_dev);
3143 }
3144
3145 static size_t macsec_get_size(const struct net_device *dev)
3146 {
3147 return 0 +
3148 nla_total_size(8) + /* SCI */
3149 nla_total_size(1) + /* ICV_LEN */
3150 nla_total_size(8) + /* CIPHER_SUITE */
3151 nla_total_size(4) + /* WINDOW */
3152 nla_total_size(1) + /* ENCODING_SA */
3153 nla_total_size(1) + /* ENCRYPT */
3154 nla_total_size(1) + /* PROTECT */
3155 nla_total_size(1) + /* INC_SCI */
3156 nla_total_size(1) + /* ES */
3157 nla_total_size(1) + /* SCB */
3158 nla_total_size(1) + /* REPLAY_PROTECT */
3159 nla_total_size(1) + /* VALIDATION */
3160 0;
3161 }
3162
3163 static int macsec_fill_info(struct sk_buff *skb,
3164 const struct net_device *dev)
3165 {
3166 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3167 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3168
3169 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci) ||
3170 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3171 nla_put_u64(skb, IFLA_MACSEC_CIPHER_SUITE, DEFAULT_CIPHER_ID) ||
3172 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3173 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3174 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3175 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3176 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3177 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3178 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3179 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3180 0)
3181 goto nla_put_failure;
3182
3183 if (secy->replay_protect) {
3184 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3185 goto nla_put_failure;
3186 }
3187
3188 return 0;
3189
3190 nla_put_failure:
3191 return -EMSGSIZE;
3192 }
3193
3194 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3195 .kind = "macsec",
3196 .priv_size = sizeof(struct macsec_dev),
3197 .maxtype = IFLA_MACSEC_MAX,
3198 .policy = macsec_rtnl_policy,
3199 .setup = macsec_setup,
3200 .validate = macsec_validate_attr,
3201 .newlink = macsec_newlink,
3202 .changelink = macsec_changelink,
3203 .dellink = macsec_dellink,
3204 .get_size = macsec_get_size,
3205 .fill_info = macsec_fill_info,
3206 .get_link_net = macsec_get_link_net,
3207 };
3208
3209 static bool is_macsec_master(struct net_device *dev)
3210 {
3211 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3212 }
3213
3214 static int macsec_notify(struct notifier_block *this, unsigned long event,
3215 void *ptr)
3216 {
3217 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3218 LIST_HEAD(head);
3219
3220 if (!is_macsec_master(real_dev))
3221 return NOTIFY_DONE;
3222
3223 switch (event) {
3224 case NETDEV_UNREGISTER: {
3225 struct macsec_dev *m, *n;
3226 struct macsec_rxh_data *rxd;
3227
3228 rxd = macsec_data_rtnl(real_dev);
3229 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3230 macsec_dellink(m->secy.netdev, &head);
3231 }
3232 unregister_netdevice_many(&head);
3233 break;
3234 }
3235 case NETDEV_CHANGEMTU: {
3236 struct macsec_dev *m;
3237 struct macsec_rxh_data *rxd;
3238
3239 rxd = macsec_data_rtnl(real_dev);
3240 list_for_each_entry(m, &rxd->secys, secys) {
3241 struct net_device *dev = m->secy.netdev;
3242 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3243 macsec_extra_len(true));
3244
3245 if (dev->mtu > mtu)
3246 dev_set_mtu(dev, mtu);
3247 }
3248 }
3249 }
3250
3251 return NOTIFY_OK;
3252 }
3253
3254 static struct notifier_block macsec_notifier = {
3255 .notifier_call = macsec_notify,
3256 };
3257
3258 static int __init macsec_init(void)
3259 {
3260 int err;
3261
3262 pr_info("MACsec IEEE 802.1AE\n");
3263 err = register_netdevice_notifier(&macsec_notifier);
3264 if (err)
3265 return err;
3266
3267 err = rtnl_link_register(&macsec_link_ops);
3268 if (err)
3269 goto notifier;
3270
3271 err = genl_register_family_with_ops(&macsec_fam, macsec_genl_ops);
3272 if (err)
3273 goto rtnl;
3274
3275 return 0;
3276
3277 rtnl:
3278 rtnl_link_unregister(&macsec_link_ops);
3279 notifier:
3280 unregister_netdevice_notifier(&macsec_notifier);
3281 return err;
3282 }
3283
3284 static void __exit macsec_exit(void)
3285 {
3286 genl_unregister_family(&macsec_fam);
3287 rtnl_link_unregister(&macsec_link_ops);
3288 unregister_netdevice_notifier(&macsec_notifier);
3289 }
3290
3291 module_init(macsec_init);
3292 module_exit(macsec_exit);
3293
3294 MODULE_ALIAS_RTNL_LINK("macsec");
3295
3296 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3297 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support