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Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[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 #include <net/gro_cells.h>
22
23 #include <uapi/linux/if_macsec.h>
24
25 typedef u64 __bitwise sci_t;
26
27 #define MACSEC_SCI_LEN 8
28
29 /* SecTAG length = macsec_eth_header without the optional SCI */
30 #define MACSEC_TAG_LEN 6
31
32 struct macsec_eth_header {
33 struct ethhdr eth;
34 /* SecTAG */
35 u8 tci_an;
36 #if defined(__LITTLE_ENDIAN_BITFIELD)
37 u8 short_length:6,
38 unused:2;
39 #elif defined(__BIG_ENDIAN_BITFIELD)
40 u8 unused:2,
41 short_length:6;
42 #else
43 #error "Please fix <asm/byteorder.h>"
44 #endif
45 __be32 packet_number;
46 u8 secure_channel_id[8]; /* optional */
47 } __packed;
48
49 #define MACSEC_TCI_VERSION 0x80
50 #define MACSEC_TCI_ES 0x40 /* end station */
51 #define MACSEC_TCI_SC 0x20 /* SCI present */
52 #define MACSEC_TCI_SCB 0x10 /* epon */
53 #define MACSEC_TCI_E 0x08 /* encryption */
54 #define MACSEC_TCI_C 0x04 /* changed text */
55 #define MACSEC_AN_MASK 0x03 /* association number */
56 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
57
58 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
59 #define MIN_NON_SHORT_LEN 48
60
61 #define GCM_AES_IV_LEN 12
62 #define DEFAULT_ICV_LEN 16
63
64 #define MACSEC_NUM_AN 4 /* 2 bits for the association number */
65
66 #define for_each_rxsc(secy, sc) \
67 for (sc = rcu_dereference_bh(secy->rx_sc); \
68 sc; \
69 sc = rcu_dereference_bh(sc->next))
70 #define for_each_rxsc_rtnl(secy, sc) \
71 for (sc = rtnl_dereference(secy->rx_sc); \
72 sc; \
73 sc = rtnl_dereference(sc->next))
74
75 struct gcm_iv {
76 union {
77 u8 secure_channel_id[8];
78 sci_t sci;
79 };
80 __be32 pn;
81 };
82
83 /**
84 * struct macsec_key - SA key
85 * @id: user-provided key identifier
86 * @tfm: crypto struct, key storage
87 */
88 struct macsec_key {
89 u8 id[MACSEC_KEYID_LEN];
90 struct crypto_aead *tfm;
91 };
92
93 struct macsec_rx_sc_stats {
94 __u64 InOctetsValidated;
95 __u64 InOctetsDecrypted;
96 __u64 InPktsUnchecked;
97 __u64 InPktsDelayed;
98 __u64 InPktsOK;
99 __u64 InPktsInvalid;
100 __u64 InPktsLate;
101 __u64 InPktsNotValid;
102 __u64 InPktsNotUsingSA;
103 __u64 InPktsUnusedSA;
104 };
105
106 struct macsec_rx_sa_stats {
107 __u32 InPktsOK;
108 __u32 InPktsInvalid;
109 __u32 InPktsNotValid;
110 __u32 InPktsNotUsingSA;
111 __u32 InPktsUnusedSA;
112 };
113
114 struct macsec_tx_sa_stats {
115 __u32 OutPktsProtected;
116 __u32 OutPktsEncrypted;
117 };
118
119 struct macsec_tx_sc_stats {
120 __u64 OutPktsProtected;
121 __u64 OutPktsEncrypted;
122 __u64 OutOctetsProtected;
123 __u64 OutOctetsEncrypted;
124 };
125
126 struct macsec_dev_stats {
127 __u64 OutPktsUntagged;
128 __u64 InPktsUntagged;
129 __u64 OutPktsTooLong;
130 __u64 InPktsNoTag;
131 __u64 InPktsBadTag;
132 __u64 InPktsUnknownSCI;
133 __u64 InPktsNoSCI;
134 __u64 InPktsOverrun;
135 };
136
137 /**
138 * struct macsec_rx_sa - receive secure association
139 * @active:
140 * @next_pn: packet number expected for the next packet
141 * @lock: protects next_pn manipulations
142 * @key: key structure
143 * @stats: per-SA stats
144 */
145 struct macsec_rx_sa {
146 struct macsec_key key;
147 spinlock_t lock;
148 u32 next_pn;
149 atomic_t refcnt;
150 bool active;
151 struct macsec_rx_sa_stats __percpu *stats;
152 struct macsec_rx_sc *sc;
153 struct rcu_head rcu;
154 };
155
156 struct pcpu_rx_sc_stats {
157 struct macsec_rx_sc_stats stats;
158 struct u64_stats_sync syncp;
159 };
160
161 /**
162 * struct macsec_rx_sc - receive secure channel
163 * @sci: secure channel identifier for this SC
164 * @active: channel is active
165 * @sa: array of secure associations
166 * @stats: per-SC stats
167 */
168 struct macsec_rx_sc {
169 struct macsec_rx_sc __rcu *next;
170 sci_t sci;
171 bool active;
172 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN];
173 struct pcpu_rx_sc_stats __percpu *stats;
174 atomic_t refcnt;
175 struct rcu_head rcu_head;
176 };
177
178 /**
179 * struct macsec_tx_sa - transmit secure association
180 * @active:
181 * @next_pn: packet number to use for the next packet
182 * @lock: protects next_pn manipulations
183 * @key: key structure
184 * @stats: per-SA stats
185 */
186 struct macsec_tx_sa {
187 struct macsec_key key;
188 spinlock_t lock;
189 u32 next_pn;
190 atomic_t refcnt;
191 bool active;
192 struct macsec_tx_sa_stats __percpu *stats;
193 struct rcu_head rcu;
194 };
195
196 struct pcpu_tx_sc_stats {
197 struct macsec_tx_sc_stats stats;
198 struct u64_stats_sync syncp;
199 };
200
201 /**
202 * struct macsec_tx_sc - transmit secure channel
203 * @active:
204 * @encoding_sa: association number of the SA currently in use
205 * @encrypt: encrypt packets on transmit, or authenticate only
206 * @send_sci: always include the SCI in the SecTAG
207 * @end_station:
208 * @scb: single copy broadcast flag
209 * @sa: array of secure associations
210 * @stats: stats for this TXSC
211 */
212 struct macsec_tx_sc {
213 bool active;
214 u8 encoding_sa;
215 bool encrypt;
216 bool send_sci;
217 bool end_station;
218 bool scb;
219 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN];
220 struct pcpu_tx_sc_stats __percpu *stats;
221 };
222
223 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
224
225 /**
226 * struct macsec_secy - MACsec Security Entity
227 * @netdev: netdevice for this SecY
228 * @n_rx_sc: number of receive secure channels configured on this SecY
229 * @sci: secure channel identifier used for tx
230 * @key_len: length of keys used by the cipher suite
231 * @icv_len: length of ICV used by the cipher suite
232 * @validate_frames: validation mode
233 * @operational: MAC_Operational flag
234 * @protect_frames: enable protection for this SecY
235 * @replay_protect: enable packet number checks on receive
236 * @replay_window: size of the replay window
237 * @tx_sc: transmit secure channel
238 * @rx_sc: linked list of receive secure channels
239 */
240 struct macsec_secy {
241 struct net_device *netdev;
242 unsigned int n_rx_sc;
243 sci_t sci;
244 u16 key_len;
245 u16 icv_len;
246 enum macsec_validation_type validate_frames;
247 bool operational;
248 bool protect_frames;
249 bool replay_protect;
250 u32 replay_window;
251 struct macsec_tx_sc tx_sc;
252 struct macsec_rx_sc __rcu *rx_sc;
253 };
254
255 struct pcpu_secy_stats {
256 struct macsec_dev_stats stats;
257 struct u64_stats_sync syncp;
258 };
259
260 /**
261 * struct macsec_dev - private data
262 * @secy: SecY config
263 * @real_dev: pointer to underlying netdevice
264 * @stats: MACsec device stats
265 * @secys: linked list of SecY's on the underlying device
266 */
267 struct macsec_dev {
268 struct macsec_secy secy;
269 struct net_device *real_dev;
270 struct pcpu_secy_stats __percpu *stats;
271 struct list_head secys;
272 struct gro_cells gro_cells;
273 };
274
275 /**
276 * struct macsec_rxh_data - rx_handler private argument
277 * @secys: linked list of SecY's on this underlying device
278 */
279 struct macsec_rxh_data {
280 struct list_head secys;
281 };
282
283 static struct macsec_dev *macsec_priv(const struct net_device *dev)
284 {
285 return (struct macsec_dev *)netdev_priv(dev);
286 }
287
288 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
289 {
290 return rcu_dereference_bh(dev->rx_handler_data);
291 }
292
293 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
294 {
295 return rtnl_dereference(dev->rx_handler_data);
296 }
297
298 struct macsec_cb {
299 struct aead_request *req;
300 union {
301 struct macsec_tx_sa *tx_sa;
302 struct macsec_rx_sa *rx_sa;
303 };
304 u8 assoc_num;
305 bool valid;
306 bool has_sci;
307 };
308
309 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
310 {
311 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
312
313 if (!sa || !sa->active)
314 return NULL;
315
316 if (!atomic_inc_not_zero(&sa->refcnt))
317 return NULL;
318
319 return sa;
320 }
321
322 static void free_rx_sc_rcu(struct rcu_head *head)
323 {
324 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
325
326 free_percpu(rx_sc->stats);
327 kfree(rx_sc);
328 }
329
330 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
331 {
332 return atomic_inc_not_zero(&sc->refcnt) ? sc : NULL;
333 }
334
335 static void macsec_rxsc_put(struct macsec_rx_sc *sc)
336 {
337 if (atomic_dec_and_test(&sc->refcnt))
338 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
339 }
340
341 static void free_rxsa(struct rcu_head *head)
342 {
343 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
344
345 crypto_free_aead(sa->key.tfm);
346 free_percpu(sa->stats);
347 macsec_rxsc_put(sa->sc);
348 kfree(sa);
349 }
350
351 static void macsec_rxsa_put(struct macsec_rx_sa *sa)
352 {
353 if (atomic_dec_and_test(&sa->refcnt))
354 call_rcu(&sa->rcu, free_rxsa);
355 }
356
357 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
358 {
359 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
360
361 if (!sa || !sa->active)
362 return NULL;
363
364 if (!atomic_inc_not_zero(&sa->refcnt))
365 return NULL;
366
367 return sa;
368 }
369
370 static void free_txsa(struct rcu_head *head)
371 {
372 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
373
374 crypto_free_aead(sa->key.tfm);
375 free_percpu(sa->stats);
376 kfree(sa);
377 }
378
379 static void macsec_txsa_put(struct macsec_tx_sa *sa)
380 {
381 if (atomic_dec_and_test(&sa->refcnt))
382 call_rcu(&sa->rcu, free_txsa);
383 }
384
385 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
386 {
387 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
388 return (struct macsec_cb *)skb->cb;
389 }
390
391 #define MACSEC_PORT_ES (htons(0x0001))
392 #define MACSEC_PORT_SCB (0x0000)
393 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
394
395 #define DEFAULT_SAK_LEN 16
396 #define DEFAULT_SEND_SCI true
397 #define DEFAULT_ENCRYPT false
398 #define DEFAULT_ENCODING_SA 0
399
400 static sci_t make_sci(u8 *addr, __be16 port)
401 {
402 sci_t sci;
403
404 memcpy(&sci, addr, ETH_ALEN);
405 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
406
407 return sci;
408 }
409
410 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
411 {
412 sci_t sci;
413
414 if (sci_present)
415 memcpy(&sci, hdr->secure_channel_id,
416 sizeof(hdr->secure_channel_id));
417 else
418 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
419
420 return sci;
421 }
422
423 static unsigned int macsec_sectag_len(bool sci_present)
424 {
425 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
426 }
427
428 static unsigned int macsec_hdr_len(bool sci_present)
429 {
430 return macsec_sectag_len(sci_present) + ETH_HLEN;
431 }
432
433 static unsigned int macsec_extra_len(bool sci_present)
434 {
435 return macsec_sectag_len(sci_present) + sizeof(__be16);
436 }
437
438 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
439 static void macsec_fill_sectag(struct macsec_eth_header *h,
440 const struct macsec_secy *secy, u32 pn)
441 {
442 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
443
444 memset(&h->tci_an, 0, macsec_sectag_len(tx_sc->send_sci));
445 h->eth.h_proto = htons(ETH_P_MACSEC);
446
447 if (tx_sc->send_sci ||
448 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb)) {
449 h->tci_an |= MACSEC_TCI_SC;
450 memcpy(&h->secure_channel_id, &secy->sci,
451 sizeof(h->secure_channel_id));
452 } else {
453 if (tx_sc->end_station)
454 h->tci_an |= MACSEC_TCI_ES;
455 if (tx_sc->scb)
456 h->tci_an |= MACSEC_TCI_SCB;
457 }
458
459 h->packet_number = htonl(pn);
460
461 /* with GCM, C/E clear for !encrypt, both set for encrypt */
462 if (tx_sc->encrypt)
463 h->tci_an |= MACSEC_TCI_CONFID;
464 else if (secy->icv_len != DEFAULT_ICV_LEN)
465 h->tci_an |= MACSEC_TCI_C;
466
467 h->tci_an |= tx_sc->encoding_sa;
468 }
469
470 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
471 {
472 if (data_len < MIN_NON_SHORT_LEN)
473 h->short_length = data_len;
474 }
475
476 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
477 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
478 {
479 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
480 int len = skb->len - 2 * ETH_ALEN;
481 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
482
483 /* a) It comprises at least 17 octets */
484 if (skb->len <= 16)
485 return false;
486
487 /* b) MACsec EtherType: already checked */
488
489 /* c) V bit is clear */
490 if (h->tci_an & MACSEC_TCI_VERSION)
491 return false;
492
493 /* d) ES or SCB => !SC */
494 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
495 (h->tci_an & MACSEC_TCI_SC))
496 return false;
497
498 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
499 if (h->unused)
500 return false;
501
502 /* rx.pn != 0 (figure 10-5) */
503 if (!h->packet_number)
504 return false;
505
506 /* length check, f) g) h) i) */
507 if (h->short_length)
508 return len == extra_len + h->short_length;
509 return len >= extra_len + MIN_NON_SHORT_LEN;
510 }
511
512 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
513 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
514
515 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
516 {
517 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
518
519 gcm_iv->sci = sci;
520 gcm_iv->pn = htonl(pn);
521 }
522
523 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
524 {
525 return (struct macsec_eth_header *)skb_mac_header(skb);
526 }
527
528 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
529 {
530 u32 pn;
531
532 spin_lock_bh(&tx_sa->lock);
533 pn = tx_sa->next_pn;
534
535 tx_sa->next_pn++;
536 if (tx_sa->next_pn == 0) {
537 pr_debug("PN wrapped, transitioning to !oper\n");
538 tx_sa->active = false;
539 if (secy->protect_frames)
540 secy->operational = false;
541 }
542 spin_unlock_bh(&tx_sa->lock);
543
544 return pn;
545 }
546
547 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
548 {
549 struct macsec_dev *macsec = netdev_priv(dev);
550
551 skb->dev = macsec->real_dev;
552 skb_reset_mac_header(skb);
553 skb->protocol = eth_hdr(skb)->h_proto;
554 }
555
556 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
557 struct macsec_tx_sa *tx_sa)
558 {
559 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
560
561 u64_stats_update_begin(&txsc_stats->syncp);
562 if (tx_sc->encrypt) {
563 txsc_stats->stats.OutOctetsEncrypted += skb->len;
564 txsc_stats->stats.OutPktsEncrypted++;
565 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
566 } else {
567 txsc_stats->stats.OutOctetsProtected += skb->len;
568 txsc_stats->stats.OutPktsProtected++;
569 this_cpu_inc(tx_sa->stats->OutPktsProtected);
570 }
571 u64_stats_update_end(&txsc_stats->syncp);
572 }
573
574 static void count_tx(struct net_device *dev, int ret, int len)
575 {
576 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
577 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
578
579 u64_stats_update_begin(&stats->syncp);
580 stats->tx_packets++;
581 stats->tx_bytes += len;
582 u64_stats_update_end(&stats->syncp);
583 } else {
584 dev->stats.tx_dropped++;
585 }
586 }
587
588 static void macsec_encrypt_done(struct crypto_async_request *base, int err)
589 {
590 struct sk_buff *skb = base->data;
591 struct net_device *dev = skb->dev;
592 struct macsec_dev *macsec = macsec_priv(dev);
593 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
594 int len, ret;
595
596 aead_request_free(macsec_skb_cb(skb)->req);
597
598 rcu_read_lock_bh();
599 macsec_encrypt_finish(skb, dev);
600 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
601 len = skb->len;
602 ret = dev_queue_xmit(skb);
603 count_tx(dev, ret, len);
604 rcu_read_unlock_bh();
605
606 macsec_txsa_put(sa);
607 dev_put(dev);
608 }
609
610 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
611 unsigned char **iv,
612 struct scatterlist **sg)
613 {
614 size_t size, iv_offset, sg_offset;
615 struct aead_request *req;
616 void *tmp;
617
618 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
619 iv_offset = size;
620 size += GCM_AES_IV_LEN;
621
622 size = ALIGN(size, __alignof__(struct scatterlist));
623 sg_offset = size;
624 size += sizeof(struct scatterlist) * (MAX_SKB_FRAGS + 1);
625
626 tmp = kmalloc(size, GFP_ATOMIC);
627 if (!tmp)
628 return NULL;
629
630 *iv = (unsigned char *)(tmp + iv_offset);
631 *sg = (struct scatterlist *)(tmp + sg_offset);
632 req = tmp;
633
634 aead_request_set_tfm(req, tfm);
635
636 return req;
637 }
638
639 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
640 struct net_device *dev)
641 {
642 int ret;
643 struct scatterlist *sg;
644 unsigned char *iv;
645 struct ethhdr *eth;
646 struct macsec_eth_header *hh;
647 size_t unprotected_len;
648 struct aead_request *req;
649 struct macsec_secy *secy;
650 struct macsec_tx_sc *tx_sc;
651 struct macsec_tx_sa *tx_sa;
652 struct macsec_dev *macsec = macsec_priv(dev);
653 u32 pn;
654
655 secy = &macsec->secy;
656 tx_sc = &secy->tx_sc;
657
658 /* 10.5.1 TX SA assignment */
659 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
660 if (!tx_sa) {
661 secy->operational = false;
662 kfree_skb(skb);
663 return ERR_PTR(-EINVAL);
664 }
665
666 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
667 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
668 struct sk_buff *nskb = skb_copy_expand(skb,
669 MACSEC_NEEDED_HEADROOM,
670 MACSEC_NEEDED_TAILROOM,
671 GFP_ATOMIC);
672 if (likely(nskb)) {
673 consume_skb(skb);
674 skb = nskb;
675 } else {
676 macsec_txsa_put(tx_sa);
677 kfree_skb(skb);
678 return ERR_PTR(-ENOMEM);
679 }
680 } else {
681 skb = skb_unshare(skb, GFP_ATOMIC);
682 if (!skb) {
683 macsec_txsa_put(tx_sa);
684 return ERR_PTR(-ENOMEM);
685 }
686 }
687
688 unprotected_len = skb->len;
689 eth = eth_hdr(skb);
690 hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(tx_sc->send_sci));
691 memmove(hh, eth, 2 * ETH_ALEN);
692
693 pn = tx_sa_update_pn(tx_sa, secy);
694 if (pn == 0) {
695 macsec_txsa_put(tx_sa);
696 kfree_skb(skb);
697 return ERR_PTR(-ENOLINK);
698 }
699 macsec_fill_sectag(hh, secy, pn);
700 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
701
702 skb_put(skb, secy->icv_len);
703
704 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
705 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
706
707 u64_stats_update_begin(&secy_stats->syncp);
708 secy_stats->stats.OutPktsTooLong++;
709 u64_stats_update_end(&secy_stats->syncp);
710
711 macsec_txsa_put(tx_sa);
712 kfree_skb(skb);
713 return ERR_PTR(-EINVAL);
714 }
715
716 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg);
717 if (!req) {
718 macsec_txsa_put(tx_sa);
719 kfree_skb(skb);
720 return ERR_PTR(-ENOMEM);
721 }
722
723 macsec_fill_iv(iv, secy->sci, pn);
724
725 sg_init_table(sg, MAX_SKB_FRAGS + 1);
726 skb_to_sgvec(skb, sg, 0, skb->len);
727
728 if (tx_sc->encrypt) {
729 int len = skb->len - macsec_hdr_len(tx_sc->send_sci) -
730 secy->icv_len;
731 aead_request_set_crypt(req, sg, sg, len, iv);
732 aead_request_set_ad(req, macsec_hdr_len(tx_sc->send_sci));
733 } else {
734 aead_request_set_crypt(req, sg, sg, 0, iv);
735 aead_request_set_ad(req, skb->len - secy->icv_len);
736 }
737
738 macsec_skb_cb(skb)->req = req;
739 macsec_skb_cb(skb)->tx_sa = tx_sa;
740 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
741
742 dev_hold(skb->dev);
743 ret = crypto_aead_encrypt(req);
744 if (ret == -EINPROGRESS) {
745 return ERR_PTR(ret);
746 } else if (ret != 0) {
747 dev_put(skb->dev);
748 kfree_skb(skb);
749 aead_request_free(req);
750 macsec_txsa_put(tx_sa);
751 return ERR_PTR(-EINVAL);
752 }
753
754 dev_put(skb->dev);
755 aead_request_free(req);
756 macsec_txsa_put(tx_sa);
757
758 return skb;
759 }
760
761 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
762 {
763 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
764 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
765 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
766 u32 lowest_pn = 0;
767
768 spin_lock(&rx_sa->lock);
769 if (rx_sa->next_pn >= secy->replay_window)
770 lowest_pn = rx_sa->next_pn - secy->replay_window;
771
772 /* Now perform replay protection check again
773 * (see IEEE 802.1AE-2006 figure 10-5)
774 */
775 if (secy->replay_protect && pn < lowest_pn) {
776 spin_unlock(&rx_sa->lock);
777 u64_stats_update_begin(&rxsc_stats->syncp);
778 rxsc_stats->stats.InPktsLate++;
779 u64_stats_update_end(&rxsc_stats->syncp);
780 return false;
781 }
782
783 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
784 u64_stats_update_begin(&rxsc_stats->syncp);
785 if (hdr->tci_an & MACSEC_TCI_E)
786 rxsc_stats->stats.InOctetsDecrypted += skb->len;
787 else
788 rxsc_stats->stats.InOctetsValidated += skb->len;
789 u64_stats_update_end(&rxsc_stats->syncp);
790 }
791
792 if (!macsec_skb_cb(skb)->valid) {
793 spin_unlock(&rx_sa->lock);
794
795 /* 10.6.5 */
796 if (hdr->tci_an & MACSEC_TCI_C ||
797 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
798 u64_stats_update_begin(&rxsc_stats->syncp);
799 rxsc_stats->stats.InPktsNotValid++;
800 u64_stats_update_end(&rxsc_stats->syncp);
801 return false;
802 }
803
804 u64_stats_update_begin(&rxsc_stats->syncp);
805 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
806 rxsc_stats->stats.InPktsInvalid++;
807 this_cpu_inc(rx_sa->stats->InPktsInvalid);
808 } else if (pn < lowest_pn) {
809 rxsc_stats->stats.InPktsDelayed++;
810 } else {
811 rxsc_stats->stats.InPktsUnchecked++;
812 }
813 u64_stats_update_end(&rxsc_stats->syncp);
814 } else {
815 u64_stats_update_begin(&rxsc_stats->syncp);
816 if (pn < lowest_pn) {
817 rxsc_stats->stats.InPktsDelayed++;
818 } else {
819 rxsc_stats->stats.InPktsOK++;
820 this_cpu_inc(rx_sa->stats->InPktsOK);
821 }
822 u64_stats_update_end(&rxsc_stats->syncp);
823
824 if (pn >= rx_sa->next_pn)
825 rx_sa->next_pn = pn + 1;
826 spin_unlock(&rx_sa->lock);
827 }
828
829 return true;
830 }
831
832 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
833 {
834 skb->pkt_type = PACKET_HOST;
835 skb->protocol = eth_type_trans(skb, dev);
836
837 skb_reset_network_header(skb);
838 if (!skb_transport_header_was_set(skb))
839 skb_reset_transport_header(skb);
840 skb_reset_mac_len(skb);
841 }
842
843 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
844 {
845 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
846 skb_pull(skb, hdr_len);
847 pskb_trim_unique(skb, skb->len - icv_len);
848 }
849
850 static void count_rx(struct net_device *dev, int len)
851 {
852 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
853
854 u64_stats_update_begin(&stats->syncp);
855 stats->rx_packets++;
856 stats->rx_bytes += len;
857 u64_stats_update_end(&stats->syncp);
858 }
859
860 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
861 {
862 struct sk_buff *skb = base->data;
863 struct net_device *dev = skb->dev;
864 struct macsec_dev *macsec = macsec_priv(dev);
865 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
866 int len, ret;
867 u32 pn;
868
869 aead_request_free(macsec_skb_cb(skb)->req);
870
871 rcu_read_lock_bh();
872 pn = ntohl(macsec_ethhdr(skb)->packet_number);
873 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
874 rcu_read_unlock_bh();
875 kfree_skb(skb);
876 goto out;
877 }
878
879 macsec_finalize_skb(skb, macsec->secy.icv_len,
880 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
881 macsec_reset_skb(skb, macsec->secy.netdev);
882
883 len = skb->len;
884 ret = gro_cells_receive(&macsec->gro_cells, skb);
885 if (ret == NET_RX_SUCCESS)
886 count_rx(dev, len);
887 else
888 macsec->secy.netdev->stats.rx_dropped++;
889
890 rcu_read_unlock_bh();
891
892 out:
893 macsec_rxsa_put(rx_sa);
894 dev_put(dev);
895 }
896
897 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
898 struct net_device *dev,
899 struct macsec_rx_sa *rx_sa,
900 sci_t sci,
901 struct macsec_secy *secy)
902 {
903 int ret;
904 struct scatterlist *sg;
905 unsigned char *iv;
906 struct aead_request *req;
907 struct macsec_eth_header *hdr;
908 u16 icv_len = secy->icv_len;
909
910 macsec_skb_cb(skb)->valid = false;
911 skb = skb_share_check(skb, GFP_ATOMIC);
912 if (!skb)
913 return ERR_PTR(-ENOMEM);
914
915 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg);
916 if (!req) {
917 kfree_skb(skb);
918 return ERR_PTR(-ENOMEM);
919 }
920
921 hdr = (struct macsec_eth_header *)skb->data;
922 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
923
924 sg_init_table(sg, MAX_SKB_FRAGS + 1);
925 skb_to_sgvec(skb, sg, 0, skb->len);
926
927 if (hdr->tci_an & MACSEC_TCI_E) {
928 /* confidentiality: ethernet + macsec header
929 * authenticated, encrypted payload
930 */
931 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
932
933 aead_request_set_crypt(req, sg, sg, len, iv);
934 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
935 skb = skb_unshare(skb, GFP_ATOMIC);
936 if (!skb) {
937 aead_request_free(req);
938 return ERR_PTR(-ENOMEM);
939 }
940 } else {
941 /* integrity only: all headers + data authenticated */
942 aead_request_set_crypt(req, sg, sg, icv_len, iv);
943 aead_request_set_ad(req, skb->len - icv_len);
944 }
945
946 macsec_skb_cb(skb)->req = req;
947 skb->dev = dev;
948 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
949
950 dev_hold(dev);
951 ret = crypto_aead_decrypt(req);
952 if (ret == -EINPROGRESS) {
953 return ERR_PTR(ret);
954 } else if (ret != 0) {
955 /* decryption/authentication failed
956 * 10.6 if validateFrames is disabled, deliver anyway
957 */
958 if (ret != -EBADMSG) {
959 kfree_skb(skb);
960 skb = ERR_PTR(ret);
961 }
962 } else {
963 macsec_skb_cb(skb)->valid = true;
964 }
965 dev_put(dev);
966
967 aead_request_free(req);
968
969 return skb;
970 }
971
972 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
973 {
974 struct macsec_rx_sc *rx_sc;
975
976 for_each_rxsc(secy, rx_sc) {
977 if (rx_sc->sci == sci)
978 return rx_sc;
979 }
980
981 return NULL;
982 }
983
984 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
985 {
986 struct macsec_rx_sc *rx_sc;
987
988 for_each_rxsc_rtnl(secy, rx_sc) {
989 if (rx_sc->sci == sci)
990 return rx_sc;
991 }
992
993 return NULL;
994 }
995
996 static void handle_not_macsec(struct sk_buff *skb)
997 {
998 struct macsec_rxh_data *rxd;
999 struct macsec_dev *macsec;
1000
1001 rcu_read_lock();
1002 rxd = macsec_data_rcu(skb->dev);
1003
1004 /* 10.6 If the management control validateFrames is not
1005 * Strict, frames without a SecTAG are received, counted, and
1006 * delivered to the Controlled Port
1007 */
1008 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1009 struct sk_buff *nskb;
1010 int ret;
1011 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1012
1013 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1014 u64_stats_update_begin(&secy_stats->syncp);
1015 secy_stats->stats.InPktsNoTag++;
1016 u64_stats_update_end(&secy_stats->syncp);
1017 continue;
1018 }
1019
1020 /* deliver on this port */
1021 nskb = skb_clone(skb, GFP_ATOMIC);
1022 if (!nskb)
1023 break;
1024
1025 nskb->dev = macsec->secy.netdev;
1026
1027 ret = netif_rx(nskb);
1028 if (ret == NET_RX_SUCCESS) {
1029 u64_stats_update_begin(&secy_stats->syncp);
1030 secy_stats->stats.InPktsUntagged++;
1031 u64_stats_update_end(&secy_stats->syncp);
1032 } else {
1033 macsec->secy.netdev->stats.rx_dropped++;
1034 }
1035 }
1036
1037 rcu_read_unlock();
1038 }
1039
1040 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1041 {
1042 struct sk_buff *skb = *pskb;
1043 struct net_device *dev = skb->dev;
1044 struct macsec_eth_header *hdr;
1045 struct macsec_secy *secy = NULL;
1046 struct macsec_rx_sc *rx_sc;
1047 struct macsec_rx_sa *rx_sa;
1048 struct macsec_rxh_data *rxd;
1049 struct macsec_dev *macsec;
1050 sci_t sci;
1051 u32 pn;
1052 bool cbit;
1053 struct pcpu_rx_sc_stats *rxsc_stats;
1054 struct pcpu_secy_stats *secy_stats;
1055 bool pulled_sci;
1056 int ret;
1057
1058 if (skb_headroom(skb) < ETH_HLEN)
1059 goto drop_direct;
1060
1061 hdr = macsec_ethhdr(skb);
1062 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1063 handle_not_macsec(skb);
1064
1065 /* and deliver to the uncontrolled port */
1066 return RX_HANDLER_PASS;
1067 }
1068
1069 skb = skb_unshare(skb, GFP_ATOMIC);
1070 if (!skb) {
1071 *pskb = NULL;
1072 return RX_HANDLER_CONSUMED;
1073 }
1074
1075 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1076 if (!pulled_sci) {
1077 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1078 goto drop_direct;
1079 }
1080
1081 hdr = macsec_ethhdr(skb);
1082
1083 /* Frames with a SecTAG that has the TCI E bit set but the C
1084 * bit clear are discarded, as this reserved encoding is used
1085 * to identify frames with a SecTAG that are not to be
1086 * delivered to the Controlled Port.
1087 */
1088 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1089 return RX_HANDLER_PASS;
1090
1091 /* now, pull the extra length */
1092 if (hdr->tci_an & MACSEC_TCI_SC) {
1093 if (!pulled_sci)
1094 goto drop_direct;
1095 }
1096
1097 /* ethernet header is part of crypto processing */
1098 skb_push(skb, ETH_HLEN);
1099
1100 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1101 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1102 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1103
1104 rcu_read_lock();
1105 rxd = macsec_data_rcu(skb->dev);
1106
1107 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1108 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1109
1110 if (sc) {
1111 secy = &macsec->secy;
1112 rx_sc = sc;
1113 break;
1114 }
1115 }
1116
1117 if (!secy)
1118 goto nosci;
1119
1120 dev = secy->netdev;
1121 macsec = macsec_priv(dev);
1122 secy_stats = this_cpu_ptr(macsec->stats);
1123 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1124
1125 if (!macsec_validate_skb(skb, secy->icv_len)) {
1126 u64_stats_update_begin(&secy_stats->syncp);
1127 secy_stats->stats.InPktsBadTag++;
1128 u64_stats_update_end(&secy_stats->syncp);
1129 goto drop_nosa;
1130 }
1131
1132 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1133 if (!rx_sa) {
1134 /* 10.6.1 if the SA is not in use */
1135
1136 /* If validateFrames is Strict or the C bit in the
1137 * SecTAG is set, discard
1138 */
1139 if (hdr->tci_an & MACSEC_TCI_C ||
1140 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1141 u64_stats_update_begin(&rxsc_stats->syncp);
1142 rxsc_stats->stats.InPktsNotUsingSA++;
1143 u64_stats_update_end(&rxsc_stats->syncp);
1144 goto drop_nosa;
1145 }
1146
1147 /* not Strict, the frame (with the SecTAG and ICV
1148 * removed) is delivered to the Controlled Port.
1149 */
1150 u64_stats_update_begin(&rxsc_stats->syncp);
1151 rxsc_stats->stats.InPktsUnusedSA++;
1152 u64_stats_update_end(&rxsc_stats->syncp);
1153 goto deliver;
1154 }
1155
1156 /* First, PN check to avoid decrypting obviously wrong packets */
1157 pn = ntohl(hdr->packet_number);
1158 if (secy->replay_protect) {
1159 bool late;
1160
1161 spin_lock(&rx_sa->lock);
1162 late = rx_sa->next_pn >= secy->replay_window &&
1163 pn < (rx_sa->next_pn - secy->replay_window);
1164 spin_unlock(&rx_sa->lock);
1165
1166 if (late) {
1167 u64_stats_update_begin(&rxsc_stats->syncp);
1168 rxsc_stats->stats.InPktsLate++;
1169 u64_stats_update_end(&rxsc_stats->syncp);
1170 goto drop;
1171 }
1172 }
1173
1174 macsec_skb_cb(skb)->rx_sa = rx_sa;
1175
1176 /* Disabled && !changed text => skip validation */
1177 if (hdr->tci_an & MACSEC_TCI_C ||
1178 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1179 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1180
1181 if (IS_ERR(skb)) {
1182 /* the decrypt callback needs the reference */
1183 if (PTR_ERR(skb) != -EINPROGRESS)
1184 macsec_rxsa_put(rx_sa);
1185 rcu_read_unlock();
1186 *pskb = NULL;
1187 return RX_HANDLER_CONSUMED;
1188 }
1189
1190 if (!macsec_post_decrypt(skb, secy, pn))
1191 goto drop;
1192
1193 deliver:
1194 macsec_finalize_skb(skb, secy->icv_len,
1195 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1196 macsec_reset_skb(skb, secy->netdev);
1197
1198 if (rx_sa)
1199 macsec_rxsa_put(rx_sa);
1200
1201 ret = gro_cells_receive(&macsec->gro_cells, skb);
1202 if (ret == NET_RX_SUCCESS)
1203 count_rx(dev, skb->len);
1204 else
1205 macsec->secy.netdev->stats.rx_dropped++;
1206
1207 rcu_read_unlock();
1208
1209 *pskb = NULL;
1210 return RX_HANDLER_CONSUMED;
1211
1212 drop:
1213 macsec_rxsa_put(rx_sa);
1214 drop_nosa:
1215 rcu_read_unlock();
1216 drop_direct:
1217 kfree_skb(skb);
1218 *pskb = NULL;
1219 return RX_HANDLER_CONSUMED;
1220
1221 nosci:
1222 /* 10.6.1 if the SC is not found */
1223 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1224 if (!cbit)
1225 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1226 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1227
1228 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1229 struct sk_buff *nskb;
1230
1231 secy_stats = this_cpu_ptr(macsec->stats);
1232
1233 /* If validateFrames is Strict or the C bit in the
1234 * SecTAG is set, discard
1235 */
1236 if (cbit ||
1237 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1238 u64_stats_update_begin(&secy_stats->syncp);
1239 secy_stats->stats.InPktsNoSCI++;
1240 u64_stats_update_end(&secy_stats->syncp);
1241 continue;
1242 }
1243
1244 /* not strict, the frame (with the SecTAG and ICV
1245 * removed) is delivered to the Controlled Port.
1246 */
1247 nskb = skb_clone(skb, GFP_ATOMIC);
1248 if (!nskb)
1249 break;
1250
1251 macsec_reset_skb(nskb, macsec->secy.netdev);
1252
1253 ret = netif_rx(nskb);
1254 if (ret == NET_RX_SUCCESS) {
1255 u64_stats_update_begin(&secy_stats->syncp);
1256 secy_stats->stats.InPktsUnknownSCI++;
1257 u64_stats_update_end(&secy_stats->syncp);
1258 } else {
1259 macsec->secy.netdev->stats.rx_dropped++;
1260 }
1261 }
1262
1263 rcu_read_unlock();
1264 *pskb = skb;
1265 return RX_HANDLER_PASS;
1266 }
1267
1268 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1269 {
1270 struct crypto_aead *tfm;
1271 int ret;
1272
1273 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1274
1275 if (IS_ERR(tfm))
1276 return tfm;
1277
1278 ret = crypto_aead_setkey(tfm, key, key_len);
1279 if (ret < 0)
1280 goto fail;
1281
1282 ret = crypto_aead_setauthsize(tfm, icv_len);
1283 if (ret < 0)
1284 goto fail;
1285
1286 return tfm;
1287 fail:
1288 crypto_free_aead(tfm);
1289 return ERR_PTR(ret);
1290 }
1291
1292 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1293 int icv_len)
1294 {
1295 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1296 if (!rx_sa->stats)
1297 return -ENOMEM;
1298
1299 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1300 if (IS_ERR(rx_sa->key.tfm)) {
1301 free_percpu(rx_sa->stats);
1302 return PTR_ERR(rx_sa->key.tfm);
1303 }
1304
1305 rx_sa->active = false;
1306 rx_sa->next_pn = 1;
1307 atomic_set(&rx_sa->refcnt, 1);
1308 spin_lock_init(&rx_sa->lock);
1309
1310 return 0;
1311 }
1312
1313 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1314 {
1315 rx_sa->active = false;
1316
1317 macsec_rxsa_put(rx_sa);
1318 }
1319
1320 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1321 {
1322 int i;
1323
1324 for (i = 0; i < MACSEC_NUM_AN; i++) {
1325 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1326
1327 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1328 if (sa)
1329 clear_rx_sa(sa);
1330 }
1331
1332 macsec_rxsc_put(rx_sc);
1333 }
1334
1335 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1336 {
1337 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1338
1339 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1340 rx_sc;
1341 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1342 if (rx_sc->sci == sci) {
1343 if (rx_sc->active)
1344 secy->n_rx_sc--;
1345 rcu_assign_pointer(*rx_scp, rx_sc->next);
1346 return rx_sc;
1347 }
1348 }
1349
1350 return NULL;
1351 }
1352
1353 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1354 {
1355 struct macsec_rx_sc *rx_sc;
1356 struct macsec_dev *macsec;
1357 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1358 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1359 struct macsec_secy *secy;
1360
1361 list_for_each_entry(macsec, &rxd->secys, secys) {
1362 if (find_rx_sc_rtnl(&macsec->secy, sci))
1363 return ERR_PTR(-EEXIST);
1364 }
1365
1366 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1367 if (!rx_sc)
1368 return ERR_PTR(-ENOMEM);
1369
1370 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1371 if (!rx_sc->stats) {
1372 kfree(rx_sc);
1373 return ERR_PTR(-ENOMEM);
1374 }
1375
1376 rx_sc->sci = sci;
1377 rx_sc->active = true;
1378 atomic_set(&rx_sc->refcnt, 1);
1379
1380 secy = &macsec_priv(dev)->secy;
1381 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1382 rcu_assign_pointer(secy->rx_sc, rx_sc);
1383
1384 if (rx_sc->active)
1385 secy->n_rx_sc++;
1386
1387 return rx_sc;
1388 }
1389
1390 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1391 int icv_len)
1392 {
1393 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1394 if (!tx_sa->stats)
1395 return -ENOMEM;
1396
1397 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1398 if (IS_ERR(tx_sa->key.tfm)) {
1399 free_percpu(tx_sa->stats);
1400 return PTR_ERR(tx_sa->key.tfm);
1401 }
1402
1403 tx_sa->active = false;
1404 atomic_set(&tx_sa->refcnt, 1);
1405 spin_lock_init(&tx_sa->lock);
1406
1407 return 0;
1408 }
1409
1410 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1411 {
1412 tx_sa->active = false;
1413
1414 macsec_txsa_put(tx_sa);
1415 }
1416
1417 static struct genl_family macsec_fam = {
1418 .id = GENL_ID_GENERATE,
1419 .name = MACSEC_GENL_NAME,
1420 .hdrsize = 0,
1421 .version = MACSEC_GENL_VERSION,
1422 .maxattr = MACSEC_ATTR_MAX,
1423 .netnsok = true,
1424 };
1425
1426 static struct net_device *get_dev_from_nl(struct net *net,
1427 struct nlattr **attrs)
1428 {
1429 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1430 struct net_device *dev;
1431
1432 dev = __dev_get_by_index(net, ifindex);
1433 if (!dev)
1434 return ERR_PTR(-ENODEV);
1435
1436 if (!netif_is_macsec(dev))
1437 return ERR_PTR(-ENODEV);
1438
1439 return dev;
1440 }
1441
1442 static sci_t nla_get_sci(const struct nlattr *nla)
1443 {
1444 return (__force sci_t)nla_get_u64(nla);
1445 }
1446
1447 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1448 int padattr)
1449 {
1450 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1451 }
1452
1453 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1454 struct nlattr **attrs,
1455 struct nlattr **tb_sa,
1456 struct net_device **devp,
1457 struct macsec_secy **secyp,
1458 struct macsec_tx_sc **scp,
1459 u8 *assoc_num)
1460 {
1461 struct net_device *dev;
1462 struct macsec_secy *secy;
1463 struct macsec_tx_sc *tx_sc;
1464 struct macsec_tx_sa *tx_sa;
1465
1466 if (!tb_sa[MACSEC_SA_ATTR_AN])
1467 return ERR_PTR(-EINVAL);
1468
1469 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1470
1471 dev = get_dev_from_nl(net, attrs);
1472 if (IS_ERR(dev))
1473 return ERR_CAST(dev);
1474
1475 if (*assoc_num >= MACSEC_NUM_AN)
1476 return ERR_PTR(-EINVAL);
1477
1478 secy = &macsec_priv(dev)->secy;
1479 tx_sc = &secy->tx_sc;
1480
1481 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1482 if (!tx_sa)
1483 return ERR_PTR(-ENODEV);
1484
1485 *devp = dev;
1486 *scp = tx_sc;
1487 *secyp = secy;
1488 return tx_sa;
1489 }
1490
1491 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1492 struct nlattr **attrs,
1493 struct nlattr **tb_rxsc,
1494 struct net_device **devp,
1495 struct macsec_secy **secyp)
1496 {
1497 struct net_device *dev;
1498 struct macsec_secy *secy;
1499 struct macsec_rx_sc *rx_sc;
1500 sci_t sci;
1501
1502 dev = get_dev_from_nl(net, attrs);
1503 if (IS_ERR(dev))
1504 return ERR_CAST(dev);
1505
1506 secy = &macsec_priv(dev)->secy;
1507
1508 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1509 return ERR_PTR(-EINVAL);
1510
1511 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1512 rx_sc = find_rx_sc_rtnl(secy, sci);
1513 if (!rx_sc)
1514 return ERR_PTR(-ENODEV);
1515
1516 *secyp = secy;
1517 *devp = dev;
1518
1519 return rx_sc;
1520 }
1521
1522 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1523 struct nlattr **attrs,
1524 struct nlattr **tb_rxsc,
1525 struct nlattr **tb_sa,
1526 struct net_device **devp,
1527 struct macsec_secy **secyp,
1528 struct macsec_rx_sc **scp,
1529 u8 *assoc_num)
1530 {
1531 struct macsec_rx_sc *rx_sc;
1532 struct macsec_rx_sa *rx_sa;
1533
1534 if (!tb_sa[MACSEC_SA_ATTR_AN])
1535 return ERR_PTR(-EINVAL);
1536
1537 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1538 if (*assoc_num >= MACSEC_NUM_AN)
1539 return ERR_PTR(-EINVAL);
1540
1541 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1542 if (IS_ERR(rx_sc))
1543 return ERR_CAST(rx_sc);
1544
1545 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1546 if (!rx_sa)
1547 return ERR_PTR(-ENODEV);
1548
1549 *scp = rx_sc;
1550 return rx_sa;
1551 }
1552
1553
1554 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1555 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1556 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1557 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1558 };
1559
1560 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1561 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1562 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1563 };
1564
1565 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1566 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1567 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1568 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1569 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1570 .len = MACSEC_KEYID_LEN, },
1571 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1572 .len = MACSEC_MAX_KEY_LEN, },
1573 };
1574
1575 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1576 {
1577 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1578 return -EINVAL;
1579
1580 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG],
1581 macsec_genl_sa_policy))
1582 return -EINVAL;
1583
1584 return 0;
1585 }
1586
1587 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1588 {
1589 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1590 return -EINVAL;
1591
1592 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG],
1593 macsec_genl_rxsc_policy))
1594 return -EINVAL;
1595
1596 return 0;
1597 }
1598
1599 static bool validate_add_rxsa(struct nlattr **attrs)
1600 {
1601 if (!attrs[MACSEC_SA_ATTR_AN] ||
1602 !attrs[MACSEC_SA_ATTR_KEY] ||
1603 !attrs[MACSEC_SA_ATTR_KEYID])
1604 return false;
1605
1606 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1607 return false;
1608
1609 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1610 return false;
1611
1612 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1613 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1614 return false;
1615 }
1616
1617 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1618 return false;
1619
1620 return true;
1621 }
1622
1623 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1624 {
1625 struct net_device *dev;
1626 struct nlattr **attrs = info->attrs;
1627 struct macsec_secy *secy;
1628 struct macsec_rx_sc *rx_sc;
1629 struct macsec_rx_sa *rx_sa;
1630 unsigned char assoc_num;
1631 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1632 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1633 int err;
1634
1635 if (!attrs[MACSEC_ATTR_IFINDEX])
1636 return -EINVAL;
1637
1638 if (parse_sa_config(attrs, tb_sa))
1639 return -EINVAL;
1640
1641 if (parse_rxsc_config(attrs, tb_rxsc))
1642 return -EINVAL;
1643
1644 if (!validate_add_rxsa(tb_sa))
1645 return -EINVAL;
1646
1647 rtnl_lock();
1648 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1649 if (IS_ERR(rx_sc) || !macsec_rxsc_get(rx_sc)) {
1650 rtnl_unlock();
1651 return PTR_ERR(rx_sc);
1652 }
1653
1654 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1655
1656 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1657 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1658 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1659 rtnl_unlock();
1660 return -EINVAL;
1661 }
1662
1663 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1664 if (rx_sa) {
1665 rtnl_unlock();
1666 return -EBUSY;
1667 }
1668
1669 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1670 if (!rx_sa) {
1671 rtnl_unlock();
1672 return -ENOMEM;
1673 }
1674
1675 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1676 secy->key_len, secy->icv_len);
1677 if (err < 0) {
1678 kfree(rx_sa);
1679 rtnl_unlock();
1680 return err;
1681 }
1682
1683 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1684 spin_lock_bh(&rx_sa->lock);
1685 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1686 spin_unlock_bh(&rx_sa->lock);
1687 }
1688
1689 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1690 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1691
1692 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1693 rx_sa->sc = rx_sc;
1694 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1695
1696 rtnl_unlock();
1697
1698 return 0;
1699 }
1700
1701 static bool validate_add_rxsc(struct nlattr **attrs)
1702 {
1703 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1704 return false;
1705
1706 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1707 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1708 return false;
1709 }
1710
1711 return true;
1712 }
1713
1714 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1715 {
1716 struct net_device *dev;
1717 sci_t sci = MACSEC_UNDEF_SCI;
1718 struct nlattr **attrs = info->attrs;
1719 struct macsec_rx_sc *rx_sc;
1720 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1721
1722 if (!attrs[MACSEC_ATTR_IFINDEX])
1723 return -EINVAL;
1724
1725 if (parse_rxsc_config(attrs, tb_rxsc))
1726 return -EINVAL;
1727
1728 if (!validate_add_rxsc(tb_rxsc))
1729 return -EINVAL;
1730
1731 rtnl_lock();
1732 dev = get_dev_from_nl(genl_info_net(info), attrs);
1733 if (IS_ERR(dev)) {
1734 rtnl_unlock();
1735 return PTR_ERR(dev);
1736 }
1737
1738 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1739
1740 rx_sc = create_rx_sc(dev, sci);
1741 if (IS_ERR(rx_sc)) {
1742 rtnl_unlock();
1743 return PTR_ERR(rx_sc);
1744 }
1745
1746 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1747 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1748
1749 rtnl_unlock();
1750
1751 return 0;
1752 }
1753
1754 static bool validate_add_txsa(struct nlattr **attrs)
1755 {
1756 if (!attrs[MACSEC_SA_ATTR_AN] ||
1757 !attrs[MACSEC_SA_ATTR_PN] ||
1758 !attrs[MACSEC_SA_ATTR_KEY] ||
1759 !attrs[MACSEC_SA_ATTR_KEYID])
1760 return false;
1761
1762 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1763 return false;
1764
1765 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1766 return false;
1767
1768 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1769 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1770 return false;
1771 }
1772
1773 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1774 return false;
1775
1776 return true;
1777 }
1778
1779 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1780 {
1781 struct net_device *dev;
1782 struct nlattr **attrs = info->attrs;
1783 struct macsec_secy *secy;
1784 struct macsec_tx_sc *tx_sc;
1785 struct macsec_tx_sa *tx_sa;
1786 unsigned char assoc_num;
1787 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1788 int err;
1789
1790 if (!attrs[MACSEC_ATTR_IFINDEX])
1791 return -EINVAL;
1792
1793 if (parse_sa_config(attrs, tb_sa))
1794 return -EINVAL;
1795
1796 if (!validate_add_txsa(tb_sa))
1797 return -EINVAL;
1798
1799 rtnl_lock();
1800 dev = get_dev_from_nl(genl_info_net(info), attrs);
1801 if (IS_ERR(dev)) {
1802 rtnl_unlock();
1803 return PTR_ERR(dev);
1804 }
1805
1806 secy = &macsec_priv(dev)->secy;
1807 tx_sc = &secy->tx_sc;
1808
1809 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1810
1811 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1812 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1813 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1814 rtnl_unlock();
1815 return -EINVAL;
1816 }
1817
1818 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1819 if (tx_sa) {
1820 rtnl_unlock();
1821 return -EBUSY;
1822 }
1823
1824 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1825 if (!tx_sa) {
1826 rtnl_unlock();
1827 return -ENOMEM;
1828 }
1829
1830 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1831 secy->key_len, secy->icv_len);
1832 if (err < 0) {
1833 kfree(tx_sa);
1834 rtnl_unlock();
1835 return err;
1836 }
1837
1838 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1839
1840 spin_lock_bh(&tx_sa->lock);
1841 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1842 spin_unlock_bh(&tx_sa->lock);
1843
1844 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1845 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1846
1847 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1848 secy->operational = true;
1849
1850 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1851
1852 rtnl_unlock();
1853
1854 return 0;
1855 }
1856
1857 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1858 {
1859 struct nlattr **attrs = info->attrs;
1860 struct net_device *dev;
1861 struct macsec_secy *secy;
1862 struct macsec_rx_sc *rx_sc;
1863 struct macsec_rx_sa *rx_sa;
1864 u8 assoc_num;
1865 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1866 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1867
1868 if (!attrs[MACSEC_ATTR_IFINDEX])
1869 return -EINVAL;
1870
1871 if (parse_sa_config(attrs, tb_sa))
1872 return -EINVAL;
1873
1874 if (parse_rxsc_config(attrs, tb_rxsc))
1875 return -EINVAL;
1876
1877 rtnl_lock();
1878 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1879 &dev, &secy, &rx_sc, &assoc_num);
1880 if (IS_ERR(rx_sa)) {
1881 rtnl_unlock();
1882 return PTR_ERR(rx_sa);
1883 }
1884
1885 if (rx_sa->active) {
1886 rtnl_unlock();
1887 return -EBUSY;
1888 }
1889
1890 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1891 clear_rx_sa(rx_sa);
1892
1893 rtnl_unlock();
1894
1895 return 0;
1896 }
1897
1898 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1899 {
1900 struct nlattr **attrs = info->attrs;
1901 struct net_device *dev;
1902 struct macsec_secy *secy;
1903 struct macsec_rx_sc *rx_sc;
1904 sci_t sci;
1905 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1906
1907 if (!attrs[MACSEC_ATTR_IFINDEX])
1908 return -EINVAL;
1909
1910 if (parse_rxsc_config(attrs, tb_rxsc))
1911 return -EINVAL;
1912
1913 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1914 return -EINVAL;
1915
1916 rtnl_lock();
1917 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1918 if (IS_ERR(dev)) {
1919 rtnl_unlock();
1920 return PTR_ERR(dev);
1921 }
1922
1923 secy = &macsec_priv(dev)->secy;
1924 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1925
1926 rx_sc = del_rx_sc(secy, sci);
1927 if (!rx_sc) {
1928 rtnl_unlock();
1929 return -ENODEV;
1930 }
1931
1932 free_rx_sc(rx_sc);
1933 rtnl_unlock();
1934
1935 return 0;
1936 }
1937
1938 static int macsec_del_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 rtnl_lock();
1955 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1956 &dev, &secy, &tx_sc, &assoc_num);
1957 if (IS_ERR(tx_sa)) {
1958 rtnl_unlock();
1959 return PTR_ERR(tx_sa);
1960 }
1961
1962 if (tx_sa->active) {
1963 rtnl_unlock();
1964 return -EBUSY;
1965 }
1966
1967 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
1968 clear_tx_sa(tx_sa);
1969
1970 rtnl_unlock();
1971
1972 return 0;
1973 }
1974
1975 static bool validate_upd_sa(struct nlattr **attrs)
1976 {
1977 if (!attrs[MACSEC_SA_ATTR_AN] ||
1978 attrs[MACSEC_SA_ATTR_KEY] ||
1979 attrs[MACSEC_SA_ATTR_KEYID])
1980 return false;
1981
1982 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1983 return false;
1984
1985 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1986 return false;
1987
1988 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1989 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1990 return false;
1991 }
1992
1993 return true;
1994 }
1995
1996 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
1997 {
1998 struct nlattr **attrs = info->attrs;
1999 struct net_device *dev;
2000 struct macsec_secy *secy;
2001 struct macsec_tx_sc *tx_sc;
2002 struct macsec_tx_sa *tx_sa;
2003 u8 assoc_num;
2004 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2005
2006 if (!attrs[MACSEC_ATTR_IFINDEX])
2007 return -EINVAL;
2008
2009 if (parse_sa_config(attrs, tb_sa))
2010 return -EINVAL;
2011
2012 if (!validate_upd_sa(tb_sa))
2013 return -EINVAL;
2014
2015 rtnl_lock();
2016 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2017 &dev, &secy, &tx_sc, &assoc_num);
2018 if (IS_ERR(tx_sa)) {
2019 rtnl_unlock();
2020 return PTR_ERR(tx_sa);
2021 }
2022
2023 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2024 spin_lock_bh(&tx_sa->lock);
2025 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2026 spin_unlock_bh(&tx_sa->lock);
2027 }
2028
2029 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2030 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2031
2032 if (assoc_num == tx_sc->encoding_sa)
2033 secy->operational = tx_sa->active;
2034
2035 rtnl_unlock();
2036
2037 return 0;
2038 }
2039
2040 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2041 {
2042 struct nlattr **attrs = info->attrs;
2043 struct net_device *dev;
2044 struct macsec_secy *secy;
2045 struct macsec_rx_sc *rx_sc;
2046 struct macsec_rx_sa *rx_sa;
2047 u8 assoc_num;
2048 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2049 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2050
2051 if (!attrs[MACSEC_ATTR_IFINDEX])
2052 return -EINVAL;
2053
2054 if (parse_rxsc_config(attrs, tb_rxsc))
2055 return -EINVAL;
2056
2057 if (parse_sa_config(attrs, tb_sa))
2058 return -EINVAL;
2059
2060 if (!validate_upd_sa(tb_sa))
2061 return -EINVAL;
2062
2063 rtnl_lock();
2064 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2065 &dev, &secy, &rx_sc, &assoc_num);
2066 if (IS_ERR(rx_sa)) {
2067 rtnl_unlock();
2068 return PTR_ERR(rx_sa);
2069 }
2070
2071 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2072 spin_lock_bh(&rx_sa->lock);
2073 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2074 spin_unlock_bh(&rx_sa->lock);
2075 }
2076
2077 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2078 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2079
2080 rtnl_unlock();
2081 return 0;
2082 }
2083
2084 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2085 {
2086 struct nlattr **attrs = info->attrs;
2087 struct net_device *dev;
2088 struct macsec_secy *secy;
2089 struct macsec_rx_sc *rx_sc;
2090 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2091
2092 if (!attrs[MACSEC_ATTR_IFINDEX])
2093 return -EINVAL;
2094
2095 if (parse_rxsc_config(attrs, tb_rxsc))
2096 return -EINVAL;
2097
2098 if (!validate_add_rxsc(tb_rxsc))
2099 return -EINVAL;
2100
2101 rtnl_lock();
2102 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2103 if (IS_ERR(rx_sc)) {
2104 rtnl_unlock();
2105 return PTR_ERR(rx_sc);
2106 }
2107
2108 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2109 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2110
2111 if (rx_sc->active != new)
2112 secy->n_rx_sc += new ? 1 : -1;
2113
2114 rx_sc->active = new;
2115 }
2116
2117 rtnl_unlock();
2118
2119 return 0;
2120 }
2121
2122 static int copy_tx_sa_stats(struct sk_buff *skb,
2123 struct macsec_tx_sa_stats __percpu *pstats)
2124 {
2125 struct macsec_tx_sa_stats sum = {0, };
2126 int cpu;
2127
2128 for_each_possible_cpu(cpu) {
2129 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2130
2131 sum.OutPktsProtected += stats->OutPktsProtected;
2132 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2133 }
2134
2135 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2136 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2137 return -EMSGSIZE;
2138
2139 return 0;
2140 }
2141
2142 static int copy_rx_sa_stats(struct sk_buff *skb,
2143 struct macsec_rx_sa_stats __percpu *pstats)
2144 {
2145 struct macsec_rx_sa_stats sum = {0, };
2146 int cpu;
2147
2148 for_each_possible_cpu(cpu) {
2149 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2150
2151 sum.InPktsOK += stats->InPktsOK;
2152 sum.InPktsInvalid += stats->InPktsInvalid;
2153 sum.InPktsNotValid += stats->InPktsNotValid;
2154 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2155 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2156 }
2157
2158 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2159 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2160 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2161 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2162 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2163 return -EMSGSIZE;
2164
2165 return 0;
2166 }
2167
2168 static int copy_rx_sc_stats(struct sk_buff *skb,
2169 struct pcpu_rx_sc_stats __percpu *pstats)
2170 {
2171 struct macsec_rx_sc_stats sum = {0, };
2172 int cpu;
2173
2174 for_each_possible_cpu(cpu) {
2175 const struct pcpu_rx_sc_stats *stats;
2176 struct macsec_rx_sc_stats tmp;
2177 unsigned int start;
2178
2179 stats = per_cpu_ptr(pstats, cpu);
2180 do {
2181 start = u64_stats_fetch_begin_irq(&stats->syncp);
2182 memcpy(&tmp, &stats->stats, sizeof(tmp));
2183 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2184
2185 sum.InOctetsValidated += tmp.InOctetsValidated;
2186 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2187 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2188 sum.InPktsDelayed += tmp.InPktsDelayed;
2189 sum.InPktsOK += tmp.InPktsOK;
2190 sum.InPktsInvalid += tmp.InPktsInvalid;
2191 sum.InPktsLate += tmp.InPktsLate;
2192 sum.InPktsNotValid += tmp.InPktsNotValid;
2193 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2194 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2195 }
2196
2197 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2198 sum.InOctetsValidated,
2199 MACSEC_RXSC_STATS_ATTR_PAD) ||
2200 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2201 sum.InOctetsDecrypted,
2202 MACSEC_RXSC_STATS_ATTR_PAD) ||
2203 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2204 sum.InPktsUnchecked,
2205 MACSEC_RXSC_STATS_ATTR_PAD) ||
2206 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2207 sum.InPktsDelayed,
2208 MACSEC_RXSC_STATS_ATTR_PAD) ||
2209 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2210 sum.InPktsOK,
2211 MACSEC_RXSC_STATS_ATTR_PAD) ||
2212 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2213 sum.InPktsInvalid,
2214 MACSEC_RXSC_STATS_ATTR_PAD) ||
2215 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2216 sum.InPktsLate,
2217 MACSEC_RXSC_STATS_ATTR_PAD) ||
2218 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2219 sum.InPktsNotValid,
2220 MACSEC_RXSC_STATS_ATTR_PAD) ||
2221 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2222 sum.InPktsNotUsingSA,
2223 MACSEC_RXSC_STATS_ATTR_PAD) ||
2224 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2225 sum.InPktsUnusedSA,
2226 MACSEC_RXSC_STATS_ATTR_PAD))
2227 return -EMSGSIZE;
2228
2229 return 0;
2230 }
2231
2232 static int copy_tx_sc_stats(struct sk_buff *skb,
2233 struct pcpu_tx_sc_stats __percpu *pstats)
2234 {
2235 struct macsec_tx_sc_stats sum = {0, };
2236 int cpu;
2237
2238 for_each_possible_cpu(cpu) {
2239 const struct pcpu_tx_sc_stats *stats;
2240 struct macsec_tx_sc_stats tmp;
2241 unsigned int start;
2242
2243 stats = per_cpu_ptr(pstats, cpu);
2244 do {
2245 start = u64_stats_fetch_begin_irq(&stats->syncp);
2246 memcpy(&tmp, &stats->stats, sizeof(tmp));
2247 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2248
2249 sum.OutPktsProtected += tmp.OutPktsProtected;
2250 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2251 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2252 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2253 }
2254
2255 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2256 sum.OutPktsProtected,
2257 MACSEC_TXSC_STATS_ATTR_PAD) ||
2258 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2259 sum.OutPktsEncrypted,
2260 MACSEC_TXSC_STATS_ATTR_PAD) ||
2261 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2262 sum.OutOctetsProtected,
2263 MACSEC_TXSC_STATS_ATTR_PAD) ||
2264 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2265 sum.OutOctetsEncrypted,
2266 MACSEC_TXSC_STATS_ATTR_PAD))
2267 return -EMSGSIZE;
2268
2269 return 0;
2270 }
2271
2272 static int copy_secy_stats(struct sk_buff *skb,
2273 struct pcpu_secy_stats __percpu *pstats)
2274 {
2275 struct macsec_dev_stats sum = {0, };
2276 int cpu;
2277
2278 for_each_possible_cpu(cpu) {
2279 const struct pcpu_secy_stats *stats;
2280 struct macsec_dev_stats tmp;
2281 unsigned int start;
2282
2283 stats = per_cpu_ptr(pstats, cpu);
2284 do {
2285 start = u64_stats_fetch_begin_irq(&stats->syncp);
2286 memcpy(&tmp, &stats->stats, sizeof(tmp));
2287 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2288
2289 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2290 sum.InPktsUntagged += tmp.InPktsUntagged;
2291 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2292 sum.InPktsNoTag += tmp.InPktsNoTag;
2293 sum.InPktsBadTag += tmp.InPktsBadTag;
2294 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2295 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2296 sum.InPktsOverrun += tmp.InPktsOverrun;
2297 }
2298
2299 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2300 sum.OutPktsUntagged,
2301 MACSEC_SECY_STATS_ATTR_PAD) ||
2302 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2303 sum.InPktsUntagged,
2304 MACSEC_SECY_STATS_ATTR_PAD) ||
2305 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2306 sum.OutPktsTooLong,
2307 MACSEC_SECY_STATS_ATTR_PAD) ||
2308 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2309 sum.InPktsNoTag,
2310 MACSEC_SECY_STATS_ATTR_PAD) ||
2311 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2312 sum.InPktsBadTag,
2313 MACSEC_SECY_STATS_ATTR_PAD) ||
2314 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2315 sum.InPktsUnknownSCI,
2316 MACSEC_SECY_STATS_ATTR_PAD) ||
2317 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2318 sum.InPktsNoSCI,
2319 MACSEC_SECY_STATS_ATTR_PAD) ||
2320 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2321 sum.InPktsOverrun,
2322 MACSEC_SECY_STATS_ATTR_PAD))
2323 return -EMSGSIZE;
2324
2325 return 0;
2326 }
2327
2328 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2329 {
2330 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2331 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2332
2333 if (!secy_nest)
2334 return 1;
2335
2336 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2337 MACSEC_SECY_ATTR_PAD) ||
2338 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2339 MACSEC_DEFAULT_CIPHER_ID,
2340 MACSEC_SECY_ATTR_PAD) ||
2341 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2342 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2343 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2344 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2345 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2346 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2347 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2348 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2349 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2350 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2351 goto cancel;
2352
2353 if (secy->replay_protect) {
2354 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2355 goto cancel;
2356 }
2357
2358 nla_nest_end(skb, secy_nest);
2359 return 0;
2360
2361 cancel:
2362 nla_nest_cancel(skb, secy_nest);
2363 return 1;
2364 }
2365
2366 static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2367 struct sk_buff *skb, struct netlink_callback *cb)
2368 {
2369 struct macsec_rx_sc *rx_sc;
2370 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2371 struct nlattr *txsa_list, *rxsc_list;
2372 int i, j;
2373 void *hdr;
2374 struct nlattr *attr;
2375
2376 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2377 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2378 if (!hdr)
2379 return -EMSGSIZE;
2380
2381 genl_dump_check_consistent(cb, hdr, &macsec_fam);
2382
2383 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2384 goto nla_put_failure;
2385
2386 if (nla_put_secy(secy, skb))
2387 goto nla_put_failure;
2388
2389 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2390 if (!attr)
2391 goto nla_put_failure;
2392 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2393 nla_nest_cancel(skb, attr);
2394 goto nla_put_failure;
2395 }
2396 nla_nest_end(skb, attr);
2397
2398 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2399 if (!attr)
2400 goto nla_put_failure;
2401 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2402 nla_nest_cancel(skb, attr);
2403 goto nla_put_failure;
2404 }
2405 nla_nest_end(skb, attr);
2406
2407 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2408 if (!txsa_list)
2409 goto nla_put_failure;
2410 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2411 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2412 struct nlattr *txsa_nest;
2413
2414 if (!tx_sa)
2415 continue;
2416
2417 txsa_nest = nla_nest_start(skb, j++);
2418 if (!txsa_nest) {
2419 nla_nest_cancel(skb, txsa_list);
2420 goto nla_put_failure;
2421 }
2422
2423 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2424 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2425 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2426 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2427 nla_nest_cancel(skb, txsa_nest);
2428 nla_nest_cancel(skb, txsa_list);
2429 goto nla_put_failure;
2430 }
2431
2432 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2433 if (!attr) {
2434 nla_nest_cancel(skb, txsa_nest);
2435 nla_nest_cancel(skb, txsa_list);
2436 goto nla_put_failure;
2437 }
2438 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2439 nla_nest_cancel(skb, attr);
2440 nla_nest_cancel(skb, txsa_nest);
2441 nla_nest_cancel(skb, txsa_list);
2442 goto nla_put_failure;
2443 }
2444 nla_nest_end(skb, attr);
2445
2446 nla_nest_end(skb, txsa_nest);
2447 }
2448 nla_nest_end(skb, txsa_list);
2449
2450 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2451 if (!rxsc_list)
2452 goto nla_put_failure;
2453
2454 j = 1;
2455 for_each_rxsc_rtnl(secy, rx_sc) {
2456 int k;
2457 struct nlattr *rxsa_list;
2458 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2459
2460 if (!rxsc_nest) {
2461 nla_nest_cancel(skb, rxsc_list);
2462 goto nla_put_failure;
2463 }
2464
2465 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2466 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
2467 MACSEC_RXSC_ATTR_PAD)) {
2468 nla_nest_cancel(skb, rxsc_nest);
2469 nla_nest_cancel(skb, rxsc_list);
2470 goto nla_put_failure;
2471 }
2472
2473 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2474 if (!attr) {
2475 nla_nest_cancel(skb, rxsc_nest);
2476 nla_nest_cancel(skb, rxsc_list);
2477 goto nla_put_failure;
2478 }
2479 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2480 nla_nest_cancel(skb, attr);
2481 nla_nest_cancel(skb, rxsc_nest);
2482 nla_nest_cancel(skb, rxsc_list);
2483 goto nla_put_failure;
2484 }
2485 nla_nest_end(skb, attr);
2486
2487 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2488 if (!rxsa_list) {
2489 nla_nest_cancel(skb, rxsc_nest);
2490 nla_nest_cancel(skb, rxsc_list);
2491 goto nla_put_failure;
2492 }
2493
2494 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2495 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2496 struct nlattr *rxsa_nest;
2497
2498 if (!rx_sa)
2499 continue;
2500
2501 rxsa_nest = nla_nest_start(skb, k++);
2502 if (!rxsa_nest) {
2503 nla_nest_cancel(skb, rxsa_list);
2504 nla_nest_cancel(skb, rxsc_nest);
2505 nla_nest_cancel(skb, rxsc_list);
2506 goto nla_put_failure;
2507 }
2508
2509 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2510 if (!attr) {
2511 nla_nest_cancel(skb, rxsa_list);
2512 nla_nest_cancel(skb, rxsc_nest);
2513 nla_nest_cancel(skb, rxsc_list);
2514 goto nla_put_failure;
2515 }
2516 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2517 nla_nest_cancel(skb, attr);
2518 nla_nest_cancel(skb, rxsa_list);
2519 nla_nest_cancel(skb, rxsc_nest);
2520 nla_nest_cancel(skb, rxsc_list);
2521 goto nla_put_failure;
2522 }
2523 nla_nest_end(skb, attr);
2524
2525 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2526 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2527 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2528 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2529 nla_nest_cancel(skb, rxsa_nest);
2530 nla_nest_cancel(skb, rxsc_nest);
2531 nla_nest_cancel(skb, rxsc_list);
2532 goto nla_put_failure;
2533 }
2534 nla_nest_end(skb, rxsa_nest);
2535 }
2536
2537 nla_nest_end(skb, rxsa_list);
2538 nla_nest_end(skb, rxsc_nest);
2539 }
2540
2541 nla_nest_end(skb, rxsc_list);
2542
2543 genlmsg_end(skb, hdr);
2544
2545 return 0;
2546
2547 nla_put_failure:
2548 genlmsg_cancel(skb, hdr);
2549 return -EMSGSIZE;
2550 }
2551
2552 static int macsec_generation = 1; /* protected by RTNL */
2553
2554 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2555 {
2556 struct net *net = sock_net(skb->sk);
2557 struct net_device *dev;
2558 int dev_idx, d;
2559
2560 dev_idx = cb->args[0];
2561
2562 d = 0;
2563 rtnl_lock();
2564
2565 cb->seq = macsec_generation;
2566
2567 for_each_netdev(net, dev) {
2568 struct macsec_secy *secy;
2569
2570 if (d < dev_idx)
2571 goto next;
2572
2573 if (!netif_is_macsec(dev))
2574 goto next;
2575
2576 secy = &macsec_priv(dev)->secy;
2577 if (dump_secy(secy, dev, skb, cb) < 0)
2578 goto done;
2579 next:
2580 d++;
2581 }
2582
2583 done:
2584 rtnl_unlock();
2585 cb->args[0] = d;
2586 return skb->len;
2587 }
2588
2589 static const struct genl_ops macsec_genl_ops[] = {
2590 {
2591 .cmd = MACSEC_CMD_GET_TXSC,
2592 .dumpit = macsec_dump_txsc,
2593 .policy = macsec_genl_policy,
2594 },
2595 {
2596 .cmd = MACSEC_CMD_ADD_RXSC,
2597 .doit = macsec_add_rxsc,
2598 .policy = macsec_genl_policy,
2599 .flags = GENL_ADMIN_PERM,
2600 },
2601 {
2602 .cmd = MACSEC_CMD_DEL_RXSC,
2603 .doit = macsec_del_rxsc,
2604 .policy = macsec_genl_policy,
2605 .flags = GENL_ADMIN_PERM,
2606 },
2607 {
2608 .cmd = MACSEC_CMD_UPD_RXSC,
2609 .doit = macsec_upd_rxsc,
2610 .policy = macsec_genl_policy,
2611 .flags = GENL_ADMIN_PERM,
2612 },
2613 {
2614 .cmd = MACSEC_CMD_ADD_TXSA,
2615 .doit = macsec_add_txsa,
2616 .policy = macsec_genl_policy,
2617 .flags = GENL_ADMIN_PERM,
2618 },
2619 {
2620 .cmd = MACSEC_CMD_DEL_TXSA,
2621 .doit = macsec_del_txsa,
2622 .policy = macsec_genl_policy,
2623 .flags = GENL_ADMIN_PERM,
2624 },
2625 {
2626 .cmd = MACSEC_CMD_UPD_TXSA,
2627 .doit = macsec_upd_txsa,
2628 .policy = macsec_genl_policy,
2629 .flags = GENL_ADMIN_PERM,
2630 },
2631 {
2632 .cmd = MACSEC_CMD_ADD_RXSA,
2633 .doit = macsec_add_rxsa,
2634 .policy = macsec_genl_policy,
2635 .flags = GENL_ADMIN_PERM,
2636 },
2637 {
2638 .cmd = MACSEC_CMD_DEL_RXSA,
2639 .doit = macsec_del_rxsa,
2640 .policy = macsec_genl_policy,
2641 .flags = GENL_ADMIN_PERM,
2642 },
2643 {
2644 .cmd = MACSEC_CMD_UPD_RXSA,
2645 .doit = macsec_upd_rxsa,
2646 .policy = macsec_genl_policy,
2647 .flags = GENL_ADMIN_PERM,
2648 },
2649 };
2650
2651 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2652 struct net_device *dev)
2653 {
2654 struct macsec_dev *macsec = netdev_priv(dev);
2655 struct macsec_secy *secy = &macsec->secy;
2656 struct pcpu_secy_stats *secy_stats;
2657 int ret, len;
2658
2659 /* 10.5 */
2660 if (!secy->protect_frames) {
2661 secy_stats = this_cpu_ptr(macsec->stats);
2662 u64_stats_update_begin(&secy_stats->syncp);
2663 secy_stats->stats.OutPktsUntagged++;
2664 u64_stats_update_end(&secy_stats->syncp);
2665 skb->dev = macsec->real_dev;
2666 len = skb->len;
2667 ret = dev_queue_xmit(skb);
2668 count_tx(dev, ret, len);
2669 return ret;
2670 }
2671
2672 if (!secy->operational) {
2673 kfree_skb(skb);
2674 dev->stats.tx_dropped++;
2675 return NETDEV_TX_OK;
2676 }
2677
2678 skb = macsec_encrypt(skb, dev);
2679 if (IS_ERR(skb)) {
2680 if (PTR_ERR(skb) != -EINPROGRESS)
2681 dev->stats.tx_dropped++;
2682 return NETDEV_TX_OK;
2683 }
2684
2685 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2686
2687 macsec_encrypt_finish(skb, dev);
2688 len = skb->len;
2689 ret = dev_queue_xmit(skb);
2690 count_tx(dev, ret, len);
2691 return ret;
2692 }
2693
2694 #define MACSEC_FEATURES \
2695 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2696 static int macsec_dev_init(struct net_device *dev)
2697 {
2698 struct macsec_dev *macsec = macsec_priv(dev);
2699 struct net_device *real_dev = macsec->real_dev;
2700 int err;
2701
2702 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2703 if (!dev->tstats)
2704 return -ENOMEM;
2705
2706 err = gro_cells_init(&macsec->gro_cells, dev);
2707 if (err) {
2708 free_percpu(dev->tstats);
2709 return err;
2710 }
2711
2712 dev->features = real_dev->features & MACSEC_FEATURES;
2713 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2714
2715 dev->needed_headroom = real_dev->needed_headroom +
2716 MACSEC_NEEDED_HEADROOM;
2717 dev->needed_tailroom = real_dev->needed_tailroom +
2718 MACSEC_NEEDED_TAILROOM;
2719
2720 if (is_zero_ether_addr(dev->dev_addr))
2721 eth_hw_addr_inherit(dev, real_dev);
2722 if (is_zero_ether_addr(dev->broadcast))
2723 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2724
2725 return 0;
2726 }
2727
2728 static void macsec_dev_uninit(struct net_device *dev)
2729 {
2730 struct macsec_dev *macsec = macsec_priv(dev);
2731
2732 gro_cells_destroy(&macsec->gro_cells);
2733 free_percpu(dev->tstats);
2734 }
2735
2736 static netdev_features_t macsec_fix_features(struct net_device *dev,
2737 netdev_features_t features)
2738 {
2739 struct macsec_dev *macsec = macsec_priv(dev);
2740 struct net_device *real_dev = macsec->real_dev;
2741
2742 features &= (real_dev->features & MACSEC_FEATURES) |
2743 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
2744 features |= NETIF_F_LLTX;
2745
2746 return features;
2747 }
2748
2749 static int macsec_dev_open(struct net_device *dev)
2750 {
2751 struct macsec_dev *macsec = macsec_priv(dev);
2752 struct net_device *real_dev = macsec->real_dev;
2753 int err;
2754
2755 if (!(real_dev->flags & IFF_UP))
2756 return -ENETDOWN;
2757
2758 err = dev_uc_add(real_dev, dev->dev_addr);
2759 if (err < 0)
2760 return err;
2761
2762 if (dev->flags & IFF_ALLMULTI) {
2763 err = dev_set_allmulti(real_dev, 1);
2764 if (err < 0)
2765 goto del_unicast;
2766 }
2767
2768 if (dev->flags & IFF_PROMISC) {
2769 err = dev_set_promiscuity(real_dev, 1);
2770 if (err < 0)
2771 goto clear_allmulti;
2772 }
2773
2774 if (netif_carrier_ok(real_dev))
2775 netif_carrier_on(dev);
2776
2777 return 0;
2778 clear_allmulti:
2779 if (dev->flags & IFF_ALLMULTI)
2780 dev_set_allmulti(real_dev, -1);
2781 del_unicast:
2782 dev_uc_del(real_dev, dev->dev_addr);
2783 netif_carrier_off(dev);
2784 return err;
2785 }
2786
2787 static int macsec_dev_stop(struct net_device *dev)
2788 {
2789 struct macsec_dev *macsec = macsec_priv(dev);
2790 struct net_device *real_dev = macsec->real_dev;
2791
2792 netif_carrier_off(dev);
2793
2794 dev_mc_unsync(real_dev, dev);
2795 dev_uc_unsync(real_dev, dev);
2796
2797 if (dev->flags & IFF_ALLMULTI)
2798 dev_set_allmulti(real_dev, -1);
2799
2800 if (dev->flags & IFF_PROMISC)
2801 dev_set_promiscuity(real_dev, -1);
2802
2803 dev_uc_del(real_dev, dev->dev_addr);
2804
2805 return 0;
2806 }
2807
2808 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2809 {
2810 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2811
2812 if (!(dev->flags & IFF_UP))
2813 return;
2814
2815 if (change & IFF_ALLMULTI)
2816 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2817
2818 if (change & IFF_PROMISC)
2819 dev_set_promiscuity(real_dev,
2820 dev->flags & IFF_PROMISC ? 1 : -1);
2821 }
2822
2823 static void macsec_dev_set_rx_mode(struct net_device *dev)
2824 {
2825 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2826
2827 dev_mc_sync(real_dev, dev);
2828 dev_uc_sync(real_dev, dev);
2829 }
2830
2831 static int macsec_set_mac_address(struct net_device *dev, void *p)
2832 {
2833 struct macsec_dev *macsec = macsec_priv(dev);
2834 struct net_device *real_dev = macsec->real_dev;
2835 struct sockaddr *addr = p;
2836 int err;
2837
2838 if (!is_valid_ether_addr(addr->sa_data))
2839 return -EADDRNOTAVAIL;
2840
2841 if (!(dev->flags & IFF_UP))
2842 goto out;
2843
2844 err = dev_uc_add(real_dev, addr->sa_data);
2845 if (err < 0)
2846 return err;
2847
2848 dev_uc_del(real_dev, dev->dev_addr);
2849
2850 out:
2851 ether_addr_copy(dev->dev_addr, addr->sa_data);
2852 return 0;
2853 }
2854
2855 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2856 {
2857 struct macsec_dev *macsec = macsec_priv(dev);
2858 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2859
2860 if (macsec->real_dev->mtu - extra < new_mtu)
2861 return -ERANGE;
2862
2863 dev->mtu = new_mtu;
2864
2865 return 0;
2866 }
2867
2868 static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev,
2869 struct rtnl_link_stats64 *s)
2870 {
2871 int cpu;
2872
2873 if (!dev->tstats)
2874 return s;
2875
2876 for_each_possible_cpu(cpu) {
2877 struct pcpu_sw_netstats *stats;
2878 struct pcpu_sw_netstats tmp;
2879 int start;
2880
2881 stats = per_cpu_ptr(dev->tstats, cpu);
2882 do {
2883 start = u64_stats_fetch_begin_irq(&stats->syncp);
2884 tmp.rx_packets = stats->rx_packets;
2885 tmp.rx_bytes = stats->rx_bytes;
2886 tmp.tx_packets = stats->tx_packets;
2887 tmp.tx_bytes = stats->tx_bytes;
2888 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2889
2890 s->rx_packets += tmp.rx_packets;
2891 s->rx_bytes += tmp.rx_bytes;
2892 s->tx_packets += tmp.tx_packets;
2893 s->tx_bytes += tmp.tx_bytes;
2894 }
2895
2896 s->rx_dropped = dev->stats.rx_dropped;
2897 s->tx_dropped = dev->stats.tx_dropped;
2898
2899 return s;
2900 }
2901
2902 static int macsec_get_iflink(const struct net_device *dev)
2903 {
2904 return macsec_priv(dev)->real_dev->ifindex;
2905 }
2906
2907 static const struct net_device_ops macsec_netdev_ops = {
2908 .ndo_init = macsec_dev_init,
2909 .ndo_uninit = macsec_dev_uninit,
2910 .ndo_open = macsec_dev_open,
2911 .ndo_stop = macsec_dev_stop,
2912 .ndo_fix_features = macsec_fix_features,
2913 .ndo_change_mtu = macsec_change_mtu,
2914 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2915 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2916 .ndo_set_mac_address = macsec_set_mac_address,
2917 .ndo_start_xmit = macsec_start_xmit,
2918 .ndo_get_stats64 = macsec_get_stats64,
2919 .ndo_get_iflink = macsec_get_iflink,
2920 };
2921
2922 static const struct device_type macsec_type = {
2923 .name = "macsec",
2924 };
2925
2926 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2927 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2928 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2929 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2930 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2931 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2932 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2933 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
2934 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
2935 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
2936 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
2937 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
2938 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
2939 };
2940
2941 static void macsec_free_netdev(struct net_device *dev)
2942 {
2943 struct macsec_dev *macsec = macsec_priv(dev);
2944 struct net_device *real_dev = macsec->real_dev;
2945
2946 free_percpu(macsec->stats);
2947 free_percpu(macsec->secy.tx_sc.stats);
2948
2949 dev_put(real_dev);
2950 free_netdev(dev);
2951 }
2952
2953 static void macsec_setup(struct net_device *dev)
2954 {
2955 ether_setup(dev);
2956 dev->priv_flags |= IFF_NO_QUEUE;
2957 dev->netdev_ops = &macsec_netdev_ops;
2958 dev->destructor = macsec_free_netdev;
2959
2960 eth_zero_addr(dev->broadcast);
2961 }
2962
2963 static void macsec_changelink_common(struct net_device *dev,
2964 struct nlattr *data[])
2965 {
2966 struct macsec_secy *secy;
2967 struct macsec_tx_sc *tx_sc;
2968
2969 secy = &macsec_priv(dev)->secy;
2970 tx_sc = &secy->tx_sc;
2971
2972 if (data[IFLA_MACSEC_ENCODING_SA]) {
2973 struct macsec_tx_sa *tx_sa;
2974
2975 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
2976 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
2977
2978 secy->operational = tx_sa && tx_sa->active;
2979 }
2980
2981 if (data[IFLA_MACSEC_WINDOW])
2982 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
2983
2984 if (data[IFLA_MACSEC_ENCRYPT])
2985 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
2986
2987 if (data[IFLA_MACSEC_PROTECT])
2988 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
2989
2990 if (data[IFLA_MACSEC_INC_SCI])
2991 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
2992
2993 if (data[IFLA_MACSEC_ES])
2994 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
2995
2996 if (data[IFLA_MACSEC_SCB])
2997 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
2998
2999 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3000 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3001
3002 if (data[IFLA_MACSEC_VALIDATION])
3003 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3004 }
3005
3006 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3007 struct nlattr *data[])
3008 {
3009 if (!data)
3010 return 0;
3011
3012 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3013 data[IFLA_MACSEC_ICV_LEN] ||
3014 data[IFLA_MACSEC_SCI] ||
3015 data[IFLA_MACSEC_PORT])
3016 return -EINVAL;
3017
3018 macsec_changelink_common(dev, data);
3019
3020 return 0;
3021 }
3022
3023 static void macsec_del_dev(struct macsec_dev *macsec)
3024 {
3025 int i;
3026
3027 while (macsec->secy.rx_sc) {
3028 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3029
3030 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3031 free_rx_sc(rx_sc);
3032 }
3033
3034 for (i = 0; i < MACSEC_NUM_AN; i++) {
3035 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3036
3037 if (sa) {
3038 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3039 clear_tx_sa(sa);
3040 }
3041 }
3042 }
3043
3044 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3045 {
3046 struct macsec_dev *macsec = macsec_priv(dev);
3047 struct net_device *real_dev = macsec->real_dev;
3048 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3049
3050 macsec_generation++;
3051
3052 unregister_netdevice_queue(dev, head);
3053 list_del_rcu(&macsec->secys);
3054 if (list_empty(&rxd->secys)) {
3055 netdev_rx_handler_unregister(real_dev);
3056 kfree(rxd);
3057 }
3058
3059 macsec_del_dev(macsec);
3060 }
3061
3062 static int register_macsec_dev(struct net_device *real_dev,
3063 struct net_device *dev)
3064 {
3065 struct macsec_dev *macsec = macsec_priv(dev);
3066 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3067
3068 if (!rxd) {
3069 int err;
3070
3071 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3072 if (!rxd)
3073 return -ENOMEM;
3074
3075 INIT_LIST_HEAD(&rxd->secys);
3076
3077 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3078 rxd);
3079 if (err < 0) {
3080 kfree(rxd);
3081 return err;
3082 }
3083 }
3084
3085 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3086 return 0;
3087 }
3088
3089 static bool sci_exists(struct net_device *dev, sci_t sci)
3090 {
3091 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3092 struct macsec_dev *macsec;
3093
3094 list_for_each_entry(macsec, &rxd->secys, secys) {
3095 if (macsec->secy.sci == sci)
3096 return true;
3097 }
3098
3099 return false;
3100 }
3101
3102 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3103 {
3104 return make_sci(dev->dev_addr, port);
3105 }
3106
3107 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3108 {
3109 struct macsec_dev *macsec = macsec_priv(dev);
3110 struct macsec_secy *secy = &macsec->secy;
3111
3112 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3113 if (!macsec->stats)
3114 return -ENOMEM;
3115
3116 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3117 if (!secy->tx_sc.stats) {
3118 free_percpu(macsec->stats);
3119 return -ENOMEM;
3120 }
3121
3122 if (sci == MACSEC_UNDEF_SCI)
3123 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3124
3125 secy->netdev = dev;
3126 secy->operational = true;
3127 secy->key_len = DEFAULT_SAK_LEN;
3128 secy->icv_len = icv_len;
3129 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3130 secy->protect_frames = true;
3131 secy->replay_protect = false;
3132
3133 secy->sci = sci;
3134 secy->tx_sc.active = true;
3135 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3136 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3137 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3138 secy->tx_sc.end_station = false;
3139 secy->tx_sc.scb = false;
3140
3141 return 0;
3142 }
3143
3144 static int macsec_newlink(struct net *net, struct net_device *dev,
3145 struct nlattr *tb[], struct nlattr *data[])
3146 {
3147 struct macsec_dev *macsec = macsec_priv(dev);
3148 struct net_device *real_dev;
3149 int err;
3150 sci_t sci;
3151 u8 icv_len = DEFAULT_ICV_LEN;
3152 rx_handler_func_t *rx_handler;
3153
3154 if (!tb[IFLA_LINK])
3155 return -EINVAL;
3156 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3157 if (!real_dev)
3158 return -ENODEV;
3159
3160 dev->priv_flags |= IFF_MACSEC;
3161
3162 macsec->real_dev = real_dev;
3163
3164 if (data && data[IFLA_MACSEC_ICV_LEN])
3165 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3166 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3167
3168 rx_handler = rtnl_dereference(real_dev->rx_handler);
3169 if (rx_handler && rx_handler != macsec_handle_frame)
3170 return -EBUSY;
3171
3172 err = register_netdevice(dev);
3173 if (err < 0)
3174 return err;
3175
3176 /* need to be already registered so that ->init has run and
3177 * the MAC addr is set
3178 */
3179 if (data && data[IFLA_MACSEC_SCI])
3180 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3181 else if (data && data[IFLA_MACSEC_PORT])
3182 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3183 else
3184 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3185
3186 if (rx_handler && sci_exists(real_dev, sci)) {
3187 err = -EBUSY;
3188 goto unregister;
3189 }
3190
3191 err = macsec_add_dev(dev, sci, icv_len);
3192 if (err)
3193 goto unregister;
3194
3195 if (data)
3196 macsec_changelink_common(dev, data);
3197
3198 err = register_macsec_dev(real_dev, dev);
3199 if (err < 0)
3200 goto del_dev;
3201
3202 macsec_generation++;
3203
3204 dev_hold(real_dev);
3205
3206 return 0;
3207
3208 del_dev:
3209 macsec_del_dev(macsec);
3210 unregister:
3211 unregister_netdevice(dev);
3212 return err;
3213 }
3214
3215 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
3216 {
3217 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3218 u8 icv_len = DEFAULT_ICV_LEN;
3219 int flag;
3220 bool es, scb, sci;
3221
3222 if (!data)
3223 return 0;
3224
3225 if (data[IFLA_MACSEC_CIPHER_SUITE])
3226 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3227
3228 if (data[IFLA_MACSEC_ICV_LEN]) {
3229 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3230 if (icv_len != DEFAULT_ICV_LEN) {
3231 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
3232 struct crypto_aead *dummy_tfm;
3233
3234 dummy_tfm = macsec_alloc_tfm(dummy_key,
3235 DEFAULT_SAK_LEN,
3236 icv_len);
3237 if (IS_ERR(dummy_tfm))
3238 return PTR_ERR(dummy_tfm);
3239 crypto_free_aead(dummy_tfm);
3240 }
3241 }
3242
3243 switch (csid) {
3244 case MACSEC_DEFAULT_CIPHER_ID:
3245 case MACSEC_DEFAULT_CIPHER_ALT:
3246 if (icv_len < MACSEC_MIN_ICV_LEN ||
3247 icv_len > MACSEC_STD_ICV_LEN)
3248 return -EINVAL;
3249 break;
3250 default:
3251 return -EINVAL;
3252 }
3253
3254 if (data[IFLA_MACSEC_ENCODING_SA]) {
3255 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3256 return -EINVAL;
3257 }
3258
3259 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3260 flag < IFLA_MACSEC_VALIDATION;
3261 flag++) {
3262 if (data[flag]) {
3263 if (nla_get_u8(data[flag]) > 1)
3264 return -EINVAL;
3265 }
3266 }
3267
3268 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3269 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3270 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3271
3272 if ((sci && (scb || es)) || (scb && es))
3273 return -EINVAL;
3274
3275 if (data[IFLA_MACSEC_VALIDATION] &&
3276 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3277 return -EINVAL;
3278
3279 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3280 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3281 !data[IFLA_MACSEC_WINDOW])
3282 return -EINVAL;
3283
3284 return 0;
3285 }
3286
3287 static struct net *macsec_get_link_net(const struct net_device *dev)
3288 {
3289 return dev_net(macsec_priv(dev)->real_dev);
3290 }
3291
3292 static size_t macsec_get_size(const struct net_device *dev)
3293 {
3294 return 0 +
3295 nla_total_size_64bit(8) + /* SCI */
3296 nla_total_size(1) + /* ICV_LEN */
3297 nla_total_size_64bit(8) + /* CIPHER_SUITE */
3298 nla_total_size(4) + /* WINDOW */
3299 nla_total_size(1) + /* ENCODING_SA */
3300 nla_total_size(1) + /* ENCRYPT */
3301 nla_total_size(1) + /* PROTECT */
3302 nla_total_size(1) + /* INC_SCI */
3303 nla_total_size(1) + /* ES */
3304 nla_total_size(1) + /* SCB */
3305 nla_total_size(1) + /* REPLAY_PROTECT */
3306 nla_total_size(1) + /* VALIDATION */
3307 0;
3308 }
3309
3310 static int macsec_fill_info(struct sk_buff *skb,
3311 const struct net_device *dev)
3312 {
3313 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3314 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3315
3316 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
3317 IFLA_MACSEC_PAD) ||
3318 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3319 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
3320 MACSEC_DEFAULT_CIPHER_ID, IFLA_MACSEC_PAD) ||
3321 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3322 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3323 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3324 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3325 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3326 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3327 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3328 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3329 0)
3330 goto nla_put_failure;
3331
3332 if (secy->replay_protect) {
3333 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3334 goto nla_put_failure;
3335 }
3336
3337 return 0;
3338
3339 nla_put_failure:
3340 return -EMSGSIZE;
3341 }
3342
3343 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3344 .kind = "macsec",
3345 .priv_size = sizeof(struct macsec_dev),
3346 .maxtype = IFLA_MACSEC_MAX,
3347 .policy = macsec_rtnl_policy,
3348 .setup = macsec_setup,
3349 .validate = macsec_validate_attr,
3350 .newlink = macsec_newlink,
3351 .changelink = macsec_changelink,
3352 .dellink = macsec_dellink,
3353 .get_size = macsec_get_size,
3354 .fill_info = macsec_fill_info,
3355 .get_link_net = macsec_get_link_net,
3356 };
3357
3358 static bool is_macsec_master(struct net_device *dev)
3359 {
3360 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3361 }
3362
3363 static int macsec_notify(struct notifier_block *this, unsigned long event,
3364 void *ptr)
3365 {
3366 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3367 LIST_HEAD(head);
3368
3369 if (!is_macsec_master(real_dev))
3370 return NOTIFY_DONE;
3371
3372 switch (event) {
3373 case NETDEV_UNREGISTER: {
3374 struct macsec_dev *m, *n;
3375 struct macsec_rxh_data *rxd;
3376
3377 rxd = macsec_data_rtnl(real_dev);
3378 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3379 macsec_dellink(m->secy.netdev, &head);
3380 }
3381 unregister_netdevice_many(&head);
3382 break;
3383 }
3384 case NETDEV_CHANGEMTU: {
3385 struct macsec_dev *m;
3386 struct macsec_rxh_data *rxd;
3387
3388 rxd = macsec_data_rtnl(real_dev);
3389 list_for_each_entry(m, &rxd->secys, secys) {
3390 struct net_device *dev = m->secy.netdev;
3391 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3392 macsec_extra_len(true));
3393
3394 if (dev->mtu > mtu)
3395 dev_set_mtu(dev, mtu);
3396 }
3397 }
3398 }
3399
3400 return NOTIFY_OK;
3401 }
3402
3403 static struct notifier_block macsec_notifier = {
3404 .notifier_call = macsec_notify,
3405 };
3406
3407 static int __init macsec_init(void)
3408 {
3409 int err;
3410
3411 pr_info("MACsec IEEE 802.1AE\n");
3412 err = register_netdevice_notifier(&macsec_notifier);
3413 if (err)
3414 return err;
3415
3416 err = rtnl_link_register(&macsec_link_ops);
3417 if (err)
3418 goto notifier;
3419
3420 err = genl_register_family_with_ops(&macsec_fam, macsec_genl_ops);
3421 if (err)
3422 goto rtnl;
3423
3424 return 0;
3425
3426 rtnl:
3427 rtnl_link_unregister(&macsec_link_ops);
3428 notifier:
3429 unregister_netdevice_notifier(&macsec_notifier);
3430 return err;
3431 }
3432
3433 static void __exit macsec_exit(void)
3434 {
3435 genl_unregister_family(&macsec_fam);
3436 rtnl_link_unregister(&macsec_link_ops);
3437 unregister_netdevice_notifier(&macsec_notifier);
3438 rcu_barrier();
3439 }
3440
3441 module_init(macsec_init);
3442 module_exit(macsec_exit);
3443
3444 MODULE_ALIAS_RTNL_LINK("macsec");
3445
3446 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3447 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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