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macsec: use after free when deleting the underlying device
[linux/fpc-iii.git] / drivers / net / macsec.c
blobdbd590a8177f739c2528b899ae5f3df298209748
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 kfree(sa);
348 }
349
350 static void macsec_rxsa_put(struct macsec_rx_sa *sa)
351 {
352 if (atomic_dec_and_test(&sa->refcnt))
353 call_rcu(&sa->rcu, free_rxsa);
354 }
355
356 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
357 {
358 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
359
360 if (!sa || !sa->active)
361 return NULL;
362
363 if (!atomic_inc_not_zero(&sa->refcnt))
364 return NULL;
365
366 return sa;
367 }
368
369 static void free_txsa(struct rcu_head *head)
370 {
371 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
372
373 crypto_free_aead(sa->key.tfm);
374 free_percpu(sa->stats);
375 kfree(sa);
376 }
377
378 static void macsec_txsa_put(struct macsec_tx_sa *sa)
379 {
380 if (atomic_dec_and_test(&sa->refcnt))
381 call_rcu(&sa->rcu, free_txsa);
382 }
383
384 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
385 {
386 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
387 return (struct macsec_cb *)skb->cb;
388 }
389
390 #define MACSEC_PORT_ES (htons(0x0001))
391 #define MACSEC_PORT_SCB (0x0000)
392 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
393
394 #define DEFAULT_SAK_LEN 16
395 #define DEFAULT_SEND_SCI true
396 #define DEFAULT_ENCRYPT false
397 #define DEFAULT_ENCODING_SA 0
398
399 static sci_t make_sci(u8 *addr, __be16 port)
400 {
401 sci_t sci;
402
403 memcpy(&sci, addr, ETH_ALEN);
404 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
405
406 return sci;
407 }
408
409 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
410 {
411 sci_t sci;
412
413 if (sci_present)
414 memcpy(&sci, hdr->secure_channel_id,
415 sizeof(hdr->secure_channel_id));
416 else
417 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
418
419 return sci;
420 }
421
422 static unsigned int macsec_sectag_len(bool sci_present)
423 {
424 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
425 }
426
427 static unsigned int macsec_hdr_len(bool sci_present)
428 {
429 return macsec_sectag_len(sci_present) + ETH_HLEN;
430 }
431
432 static unsigned int macsec_extra_len(bool sci_present)
433 {
434 return macsec_sectag_len(sci_present) + sizeof(__be16);
435 }
436
437 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
438 static void macsec_fill_sectag(struct macsec_eth_header *h,
439 const struct macsec_secy *secy, u32 pn)
440 {
441 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
442
443 memset(&h->tci_an, 0, macsec_sectag_len(tx_sc->send_sci));
444 h->eth.h_proto = htons(ETH_P_MACSEC);
445
446 if (tx_sc->send_sci ||
447 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb)) {
448 h->tci_an |= MACSEC_TCI_SC;
449 memcpy(&h->secure_channel_id, &secy->sci,
450 sizeof(h->secure_channel_id));
451 } else {
452 if (tx_sc->end_station)
453 h->tci_an |= MACSEC_TCI_ES;
454 if (tx_sc->scb)
455 h->tci_an |= MACSEC_TCI_SCB;
456 }
457
458 h->packet_number = htonl(pn);
459
460 /* with GCM, C/E clear for !encrypt, both set for encrypt */
461 if (tx_sc->encrypt)
462 h->tci_an |= MACSEC_TCI_CONFID;
463 else if (secy->icv_len != DEFAULT_ICV_LEN)
464 h->tci_an |= MACSEC_TCI_C;
465
466 h->tci_an |= tx_sc->encoding_sa;
467 }
468
469 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
470 {
471 if (data_len < MIN_NON_SHORT_LEN)
472 h->short_length = data_len;
473 }
474
475 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
476 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
477 {
478 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
479 int len = skb->len - 2 * ETH_ALEN;
480 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
481
482 /* a) It comprises at least 17 octets */
483 if (skb->len <= 16)
484 return false;
485
486 /* b) MACsec EtherType: already checked */
487
488 /* c) V bit is clear */
489 if (h->tci_an & MACSEC_TCI_VERSION)
490 return false;
491
492 /* d) ES or SCB => !SC */
493 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
494 (h->tci_an & MACSEC_TCI_SC))
495 return false;
496
497 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
498 if (h->unused)
499 return false;
500
501 /* rx.pn != 0 (figure 10-5) */
502 if (!h->packet_number)
503 return false;
504
505 /* length check, f) g) h) i) */
506 if (h->short_length)
507 return len == extra_len + h->short_length;
508 return len >= extra_len + MIN_NON_SHORT_LEN;
509 }
510
511 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
512 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
513
514 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
515 {
516 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
517
518 gcm_iv->sci = sci;
519 gcm_iv->pn = htonl(pn);
520 }
521
522 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
523 {
524 return (struct macsec_eth_header *)skb_mac_header(skb);
525 }
526
527 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
528 {
529 u32 pn;
530
531 spin_lock_bh(&tx_sa->lock);
532 pn = tx_sa->next_pn;
533
534 tx_sa->next_pn++;
535 if (tx_sa->next_pn == 0) {
536 pr_debug("PN wrapped, transitioning to !oper\n");
537 tx_sa->active = false;
538 if (secy->protect_frames)
539 secy->operational = false;
540 }
541 spin_unlock_bh(&tx_sa->lock);
542
543 return pn;
544 }
545
546 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
547 {
548 struct macsec_dev *macsec = netdev_priv(dev);
549
550 skb->dev = macsec->real_dev;
551 skb_reset_mac_header(skb);
552 skb->protocol = eth_hdr(skb)->h_proto;
553 }
554
555 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
556 struct macsec_tx_sa *tx_sa)
557 {
558 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
559
560 u64_stats_update_begin(&txsc_stats->syncp);
561 if (tx_sc->encrypt) {
562 txsc_stats->stats.OutOctetsEncrypted += skb->len;
563 txsc_stats->stats.OutPktsEncrypted++;
564 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
565 } else {
566 txsc_stats->stats.OutOctetsProtected += skb->len;
567 txsc_stats->stats.OutPktsProtected++;
568 this_cpu_inc(tx_sa->stats->OutPktsProtected);
569 }
570 u64_stats_update_end(&txsc_stats->syncp);
571 }
572
573 static void count_tx(struct net_device *dev, int ret, int len)
574 {
575 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
576 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
577
578 u64_stats_update_begin(&stats->syncp);
579 stats->tx_packets++;
580 stats->tx_bytes += len;
581 u64_stats_update_end(&stats->syncp);
582 } else {
583 dev->stats.tx_dropped++;
584 }
585 }
586
587 static void macsec_encrypt_done(struct crypto_async_request *base, int err)
588 {
589 struct sk_buff *skb = base->data;
590 struct net_device *dev = skb->dev;
591 struct macsec_dev *macsec = macsec_priv(dev);
592 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
593 int len, ret;
594
595 aead_request_free(macsec_skb_cb(skb)->req);
596
597 rcu_read_lock_bh();
598 macsec_encrypt_finish(skb, dev);
599 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
600 len = skb->len;
601 ret = dev_queue_xmit(skb);
602 count_tx(dev, ret, len);
603 rcu_read_unlock_bh();
604
605 macsec_txsa_put(sa);
606 dev_put(dev);
607 }
608
609 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
610 unsigned char **iv,
611 struct scatterlist **sg)
612 {
613 size_t size, iv_offset, sg_offset;
614 struct aead_request *req;
615 void *tmp;
616
617 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
618 iv_offset = size;
619 size += GCM_AES_IV_LEN;
620
621 size = ALIGN(size, __alignof__(struct scatterlist));
622 sg_offset = size;
623 size += sizeof(struct scatterlist) * (MAX_SKB_FRAGS + 1);
624
625 tmp = kmalloc(size, GFP_ATOMIC);
626 if (!tmp)
627 return NULL;
628
629 *iv = (unsigned char *)(tmp + iv_offset);
630 *sg = (struct scatterlist *)(tmp + sg_offset);
631 req = tmp;
632
633 aead_request_set_tfm(req, tfm);
634
635 return req;
636 }
637
638 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
639 struct net_device *dev)
640 {
641 int ret;
642 struct scatterlist *sg;
643 unsigned char *iv;
644 struct ethhdr *eth;
645 struct macsec_eth_header *hh;
646 size_t unprotected_len;
647 struct aead_request *req;
648 struct macsec_secy *secy;
649 struct macsec_tx_sc *tx_sc;
650 struct macsec_tx_sa *tx_sa;
651 struct macsec_dev *macsec = macsec_priv(dev);
652 u32 pn;
653
654 secy = &macsec->secy;
655 tx_sc = &secy->tx_sc;
656
657 /* 10.5.1 TX SA assignment */
658 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
659 if (!tx_sa) {
660 secy->operational = false;
661 kfree_skb(skb);
662 return ERR_PTR(-EINVAL);
663 }
664
665 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
666 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
667 struct sk_buff *nskb = skb_copy_expand(skb,
668 MACSEC_NEEDED_HEADROOM,
669 MACSEC_NEEDED_TAILROOM,
670 GFP_ATOMIC);
671 if (likely(nskb)) {
672 consume_skb(skb);
673 skb = nskb;
674 } else {
675 macsec_txsa_put(tx_sa);
676 kfree_skb(skb);
677 return ERR_PTR(-ENOMEM);
678 }
679 } else {
680 skb = skb_unshare(skb, GFP_ATOMIC);
681 if (!skb) {
682 macsec_txsa_put(tx_sa);
683 return ERR_PTR(-ENOMEM);
684 }
685 }
686
687 unprotected_len = skb->len;
688 eth = eth_hdr(skb);
689 hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(tx_sc->send_sci));
690 memmove(hh, eth, 2 * ETH_ALEN);
691
692 pn = tx_sa_update_pn(tx_sa, secy);
693 if (pn == 0) {
694 macsec_txsa_put(tx_sa);
695 kfree_skb(skb);
696 return ERR_PTR(-ENOLINK);
697 }
698 macsec_fill_sectag(hh, secy, pn);
699 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
700
701 skb_put(skb, secy->icv_len);
702
703 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
704 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
705
706 u64_stats_update_begin(&secy_stats->syncp);
707 secy_stats->stats.OutPktsTooLong++;
708 u64_stats_update_end(&secy_stats->syncp);
709
710 macsec_txsa_put(tx_sa);
711 kfree_skb(skb);
712 return ERR_PTR(-EINVAL);
713 }
714
715 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg);
716 if (!req) {
717 macsec_txsa_put(tx_sa);
718 kfree_skb(skb);
719 return ERR_PTR(-ENOMEM);
720 }
721
722 macsec_fill_iv(iv, secy->sci, pn);
723
724 sg_init_table(sg, MAX_SKB_FRAGS + 1);
725 skb_to_sgvec(skb, sg, 0, skb->len);
726
727 if (tx_sc->encrypt) {
728 int len = skb->len - macsec_hdr_len(tx_sc->send_sci) -
729 secy->icv_len;
730 aead_request_set_crypt(req, sg, sg, len, iv);
731 aead_request_set_ad(req, macsec_hdr_len(tx_sc->send_sci));
732 } else {
733 aead_request_set_crypt(req, sg, sg, 0, iv);
734 aead_request_set_ad(req, skb->len - secy->icv_len);
735 }
736
737 macsec_skb_cb(skb)->req = req;
738 macsec_skb_cb(skb)->tx_sa = tx_sa;
739 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
740
741 dev_hold(skb->dev);
742 ret = crypto_aead_encrypt(req);
743 if (ret == -EINPROGRESS) {
744 return ERR_PTR(ret);
745 } else if (ret != 0) {
746 dev_put(skb->dev);
747 kfree_skb(skb);
748 aead_request_free(req);
749 macsec_txsa_put(tx_sa);
750 return ERR_PTR(-EINVAL);
751 }
752
753 dev_put(skb->dev);
754 aead_request_free(req);
755 macsec_txsa_put(tx_sa);
756
757 return skb;
758 }
759
760 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
761 {
762 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
763 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
764 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
765 u32 lowest_pn = 0;
766
767 spin_lock(&rx_sa->lock);
768 if (rx_sa->next_pn >= secy->replay_window)
769 lowest_pn = rx_sa->next_pn - secy->replay_window;
770
771 /* Now perform replay protection check again
772 * (see IEEE 802.1AE-2006 figure 10-5)
773 */
774 if (secy->replay_protect && pn < lowest_pn) {
775 spin_unlock(&rx_sa->lock);
776 u64_stats_update_begin(&rxsc_stats->syncp);
777 rxsc_stats->stats.InPktsLate++;
778 u64_stats_update_end(&rxsc_stats->syncp);
779 return false;
780 }
781
782 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
783 u64_stats_update_begin(&rxsc_stats->syncp);
784 if (hdr->tci_an & MACSEC_TCI_E)
785 rxsc_stats->stats.InOctetsDecrypted += skb->len;
786 else
787 rxsc_stats->stats.InOctetsValidated += skb->len;
788 u64_stats_update_end(&rxsc_stats->syncp);
789 }
790
791 if (!macsec_skb_cb(skb)->valid) {
792 spin_unlock(&rx_sa->lock);
793
794 /* 10.6.5 */
795 if (hdr->tci_an & MACSEC_TCI_C ||
796 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
797 u64_stats_update_begin(&rxsc_stats->syncp);
798 rxsc_stats->stats.InPktsNotValid++;
799 u64_stats_update_end(&rxsc_stats->syncp);
800 return false;
801 }
802
803 u64_stats_update_begin(&rxsc_stats->syncp);
804 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
805 rxsc_stats->stats.InPktsInvalid++;
806 this_cpu_inc(rx_sa->stats->InPktsInvalid);
807 } else if (pn < lowest_pn) {
808 rxsc_stats->stats.InPktsDelayed++;
809 } else {
810 rxsc_stats->stats.InPktsUnchecked++;
811 }
812 u64_stats_update_end(&rxsc_stats->syncp);
813 } else {
814 u64_stats_update_begin(&rxsc_stats->syncp);
815 if (pn < lowest_pn) {
816 rxsc_stats->stats.InPktsDelayed++;
817 } else {
818 rxsc_stats->stats.InPktsOK++;
819 this_cpu_inc(rx_sa->stats->InPktsOK);
820 }
821 u64_stats_update_end(&rxsc_stats->syncp);
822
823 if (pn >= rx_sa->next_pn)
824 rx_sa->next_pn = pn + 1;
825 spin_unlock(&rx_sa->lock);
826 }
827
828 return true;
829 }
830
831 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
832 {
833 skb->pkt_type = PACKET_HOST;
834 skb->protocol = eth_type_trans(skb, dev);
835
836 skb_reset_network_header(skb);
837 if (!skb_transport_header_was_set(skb))
838 skb_reset_transport_header(skb);
839 skb_reset_mac_len(skb);
840 }
841
842 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
843 {
844 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
845 skb_pull(skb, hdr_len);
846 pskb_trim_unique(skb, skb->len - icv_len);
847 }
848
849 static void count_rx(struct net_device *dev, int len)
850 {
851 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
852
853 u64_stats_update_begin(&stats->syncp);
854 stats->rx_packets++;
855 stats->rx_bytes += len;
856 u64_stats_update_end(&stats->syncp);
857 }
858
859 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
860 {
861 struct sk_buff *skb = base->data;
862 struct net_device *dev = skb->dev;
863 struct macsec_dev *macsec = macsec_priv(dev);
864 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
865 struct macsec_rx_sc *rx_sc = rx_sa->sc;
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 macsec_rxsc_put(rx_sc);
895 dev_put(dev);
896 }
897
898 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
899 struct net_device *dev,
900 struct macsec_rx_sa *rx_sa,
901 sci_t sci,
902 struct macsec_secy *secy)
903 {
904 int ret;
905 struct scatterlist *sg;
906 unsigned char *iv;
907 struct aead_request *req;
908 struct macsec_eth_header *hdr;
909 u16 icv_len = secy->icv_len;
910
911 macsec_skb_cb(skb)->valid = false;
912 skb = skb_share_check(skb, GFP_ATOMIC);
913 if (!skb)
914 return ERR_PTR(-ENOMEM);
915
916 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg);
917 if (!req) {
918 kfree_skb(skb);
919 return ERR_PTR(-ENOMEM);
920 }
921
922 hdr = (struct macsec_eth_header *)skb->data;
923 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
924
925 sg_init_table(sg, MAX_SKB_FRAGS + 1);
926 skb_to_sgvec(skb, sg, 0, skb->len);
927
928 if (hdr->tci_an & MACSEC_TCI_E) {
929 /* confidentiality: ethernet + macsec header
930 * authenticated, encrypted payload
931 */
932 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
933
934 aead_request_set_crypt(req, sg, sg, len, iv);
935 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
936 skb = skb_unshare(skb, GFP_ATOMIC);
937 if (!skb) {
938 aead_request_free(req);
939 return ERR_PTR(-ENOMEM);
940 }
941 } else {
942 /* integrity only: all headers + data authenticated */
943 aead_request_set_crypt(req, sg, sg, icv_len, iv);
944 aead_request_set_ad(req, skb->len - icv_len);
945 }
946
947 macsec_skb_cb(skb)->req = req;
948 skb->dev = dev;
949 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
950
951 dev_hold(dev);
952 ret = crypto_aead_decrypt(req);
953 if (ret == -EINPROGRESS) {
954 return ERR_PTR(ret);
955 } else if (ret != 0) {
956 /* decryption/authentication failed
957 * 10.6 if validateFrames is disabled, deliver anyway
958 */
959 if (ret != -EBADMSG) {
960 kfree_skb(skb);
961 skb = ERR_PTR(ret);
962 }
963 } else {
964 macsec_skb_cb(skb)->valid = true;
965 }
966 dev_put(dev);
967
968 aead_request_free(req);
969
970 return skb;
971 }
972
973 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
974 {
975 struct macsec_rx_sc *rx_sc;
976
977 for_each_rxsc(secy, rx_sc) {
978 if (rx_sc->sci == sci)
979 return rx_sc;
980 }
981
982 return NULL;
983 }
984
985 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
986 {
987 struct macsec_rx_sc *rx_sc;
988
989 for_each_rxsc_rtnl(secy, rx_sc) {
990 if (rx_sc->sci == sci)
991 return rx_sc;
992 }
993
994 return NULL;
995 }
996
997 static void handle_not_macsec(struct sk_buff *skb)
998 {
999 struct macsec_rxh_data *rxd;
1000 struct macsec_dev *macsec;
1001
1002 rcu_read_lock();
1003 rxd = macsec_data_rcu(skb->dev);
1004
1005 /* 10.6 If the management control validateFrames is not
1006 * Strict, frames without a SecTAG are received, counted, and
1007 * delivered to the Controlled Port
1008 */
1009 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1010 struct sk_buff *nskb;
1011 int ret;
1012 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1013
1014 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1015 u64_stats_update_begin(&secy_stats->syncp);
1016 secy_stats->stats.InPktsNoTag++;
1017 u64_stats_update_end(&secy_stats->syncp);
1018 continue;
1019 }
1020
1021 /* deliver on this port */
1022 nskb = skb_clone(skb, GFP_ATOMIC);
1023 if (!nskb)
1024 break;
1025
1026 nskb->dev = macsec->secy.netdev;
1027
1028 ret = netif_rx(nskb);
1029 if (ret == NET_RX_SUCCESS) {
1030 u64_stats_update_begin(&secy_stats->syncp);
1031 secy_stats->stats.InPktsUntagged++;
1032 u64_stats_update_end(&secy_stats->syncp);
1033 } else {
1034 macsec->secy.netdev->stats.rx_dropped++;
1035 }
1036 }
1037
1038 rcu_read_unlock();
1039 }
1040
1041 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1042 {
1043 struct sk_buff *skb = *pskb;
1044 struct net_device *dev = skb->dev;
1045 struct macsec_eth_header *hdr;
1046 struct macsec_secy *secy = NULL;
1047 struct macsec_rx_sc *rx_sc;
1048 struct macsec_rx_sa *rx_sa;
1049 struct macsec_rxh_data *rxd;
1050 struct macsec_dev *macsec;
1051 sci_t sci;
1052 u32 pn;
1053 bool cbit;
1054 struct pcpu_rx_sc_stats *rxsc_stats;
1055 struct pcpu_secy_stats *secy_stats;
1056 bool pulled_sci;
1057 int ret;
1058
1059 if (skb_headroom(skb) < ETH_HLEN)
1060 goto drop_direct;
1061
1062 hdr = macsec_ethhdr(skb);
1063 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1064 handle_not_macsec(skb);
1065
1066 /* and deliver to the uncontrolled port */
1067 return RX_HANDLER_PASS;
1068 }
1069
1070 skb = skb_unshare(skb, GFP_ATOMIC);
1071 if (!skb) {
1072 *pskb = NULL;
1073 return RX_HANDLER_CONSUMED;
1074 }
1075
1076 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1077 if (!pulled_sci) {
1078 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1079 goto drop_direct;
1080 }
1081
1082 hdr = macsec_ethhdr(skb);
1083
1084 /* Frames with a SecTAG that has the TCI E bit set but the C
1085 * bit clear are discarded, as this reserved encoding is used
1086 * to identify frames with a SecTAG that are not to be
1087 * delivered to the Controlled Port.
1088 */
1089 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1090 return RX_HANDLER_PASS;
1091
1092 /* now, pull the extra length */
1093 if (hdr->tci_an & MACSEC_TCI_SC) {
1094 if (!pulled_sci)
1095 goto drop_direct;
1096 }
1097
1098 /* ethernet header is part of crypto processing */
1099 skb_push(skb, ETH_HLEN);
1100
1101 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1102 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1103 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1104
1105 rcu_read_lock();
1106 rxd = macsec_data_rcu(skb->dev);
1107
1108 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1109 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1110 sc = sc ? macsec_rxsc_get(sc) : NULL;
1111
1112 if (sc) {
1113 secy = &macsec->secy;
1114 rx_sc = sc;
1115 break;
1116 }
1117 }
1118
1119 if (!secy)
1120 goto nosci;
1121
1122 dev = secy->netdev;
1123 macsec = macsec_priv(dev);
1124 secy_stats = this_cpu_ptr(macsec->stats);
1125 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1126
1127 if (!macsec_validate_skb(skb, secy->icv_len)) {
1128 u64_stats_update_begin(&secy_stats->syncp);
1129 secy_stats->stats.InPktsBadTag++;
1130 u64_stats_update_end(&secy_stats->syncp);
1131 goto drop_nosa;
1132 }
1133
1134 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1135 if (!rx_sa) {
1136 /* 10.6.1 if the SA is not in use */
1137
1138 /* If validateFrames is Strict or the C bit in the
1139 * SecTAG is set, discard
1140 */
1141 if (hdr->tci_an & MACSEC_TCI_C ||
1142 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1143 u64_stats_update_begin(&rxsc_stats->syncp);
1144 rxsc_stats->stats.InPktsNotUsingSA++;
1145 u64_stats_update_end(&rxsc_stats->syncp);
1146 goto drop_nosa;
1147 }
1148
1149 /* not Strict, the frame (with the SecTAG and ICV
1150 * removed) is delivered to the Controlled Port.
1151 */
1152 u64_stats_update_begin(&rxsc_stats->syncp);
1153 rxsc_stats->stats.InPktsUnusedSA++;
1154 u64_stats_update_end(&rxsc_stats->syncp);
1155 goto deliver;
1156 }
1157
1158 /* First, PN check to avoid decrypting obviously wrong packets */
1159 pn = ntohl(hdr->packet_number);
1160 if (secy->replay_protect) {
1161 bool late;
1162
1163 spin_lock(&rx_sa->lock);
1164 late = rx_sa->next_pn >= secy->replay_window &&
1165 pn < (rx_sa->next_pn - secy->replay_window);
1166 spin_unlock(&rx_sa->lock);
1167
1168 if (late) {
1169 u64_stats_update_begin(&rxsc_stats->syncp);
1170 rxsc_stats->stats.InPktsLate++;
1171 u64_stats_update_end(&rxsc_stats->syncp);
1172 goto drop;
1173 }
1174 }
1175
1176 macsec_skb_cb(skb)->rx_sa = rx_sa;
1177
1178 /* Disabled && !changed text => skip validation */
1179 if (hdr->tci_an & MACSEC_TCI_C ||
1180 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1181 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1182
1183 if (IS_ERR(skb)) {
1184 /* the decrypt callback needs the reference */
1185 if (PTR_ERR(skb) != -EINPROGRESS) {
1186 macsec_rxsa_put(rx_sa);
1187 macsec_rxsc_put(rx_sc);
1188 }
1189 rcu_read_unlock();
1190 *pskb = NULL;
1191 return RX_HANDLER_CONSUMED;
1192 }
1193
1194 if (!macsec_post_decrypt(skb, secy, pn))
1195 goto drop;
1196
1197 deliver:
1198 macsec_finalize_skb(skb, secy->icv_len,
1199 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1200 macsec_reset_skb(skb, secy->netdev);
1201
1202 if (rx_sa)
1203 macsec_rxsa_put(rx_sa);
1204 macsec_rxsc_put(rx_sc);
1205
1206 ret = gro_cells_receive(&macsec->gro_cells, skb);
1207 if (ret == NET_RX_SUCCESS)
1208 count_rx(dev, skb->len);
1209 else
1210 macsec->secy.netdev->stats.rx_dropped++;
1211
1212 rcu_read_unlock();
1213
1214 *pskb = NULL;
1215 return RX_HANDLER_CONSUMED;
1216
1217 drop:
1218 macsec_rxsa_put(rx_sa);
1219 drop_nosa:
1220 macsec_rxsc_put(rx_sc);
1221 rcu_read_unlock();
1222 drop_direct:
1223 kfree_skb(skb);
1224 *pskb = NULL;
1225 return RX_HANDLER_CONSUMED;
1226
1227 nosci:
1228 /* 10.6.1 if the SC is not found */
1229 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1230 if (!cbit)
1231 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1232 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1233
1234 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1235 struct sk_buff *nskb;
1236
1237 secy_stats = this_cpu_ptr(macsec->stats);
1238
1239 /* If validateFrames is Strict or the C bit in the
1240 * SecTAG is set, discard
1241 */
1242 if (cbit ||
1243 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1244 u64_stats_update_begin(&secy_stats->syncp);
1245 secy_stats->stats.InPktsNoSCI++;
1246 u64_stats_update_end(&secy_stats->syncp);
1247 continue;
1248 }
1249
1250 /* not strict, the frame (with the SecTAG and ICV
1251 * removed) is delivered to the Controlled Port.
1252 */
1253 nskb = skb_clone(skb, GFP_ATOMIC);
1254 if (!nskb)
1255 break;
1256
1257 macsec_reset_skb(nskb, macsec->secy.netdev);
1258
1259 ret = netif_rx(nskb);
1260 if (ret == NET_RX_SUCCESS) {
1261 u64_stats_update_begin(&secy_stats->syncp);
1262 secy_stats->stats.InPktsUnknownSCI++;
1263 u64_stats_update_end(&secy_stats->syncp);
1264 } else {
1265 macsec->secy.netdev->stats.rx_dropped++;
1266 }
1267 }
1268
1269 rcu_read_unlock();
1270 *pskb = skb;
1271 return RX_HANDLER_PASS;
1272 }
1273
1274 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1275 {
1276 struct crypto_aead *tfm;
1277 int ret;
1278
1279 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1280
1281 if (IS_ERR(tfm))
1282 return tfm;
1283
1284 ret = crypto_aead_setkey(tfm, key, key_len);
1285 if (ret < 0)
1286 goto fail;
1287
1288 ret = crypto_aead_setauthsize(tfm, icv_len);
1289 if (ret < 0)
1290 goto fail;
1291
1292 return tfm;
1293 fail:
1294 crypto_free_aead(tfm);
1295 return ERR_PTR(ret);
1296 }
1297
1298 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1299 int icv_len)
1300 {
1301 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1302 if (!rx_sa->stats)
1303 return -ENOMEM;
1304
1305 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1306 if (IS_ERR(rx_sa->key.tfm)) {
1307 free_percpu(rx_sa->stats);
1308 return PTR_ERR(rx_sa->key.tfm);
1309 }
1310
1311 rx_sa->active = false;
1312 rx_sa->next_pn = 1;
1313 atomic_set(&rx_sa->refcnt, 1);
1314 spin_lock_init(&rx_sa->lock);
1315
1316 return 0;
1317 }
1318
1319 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1320 {
1321 rx_sa->active = false;
1322
1323 macsec_rxsa_put(rx_sa);
1324 }
1325
1326 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1327 {
1328 int i;
1329
1330 for (i = 0; i < MACSEC_NUM_AN; i++) {
1331 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1332
1333 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1334 if (sa)
1335 clear_rx_sa(sa);
1336 }
1337
1338 macsec_rxsc_put(rx_sc);
1339 }
1340
1341 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1342 {
1343 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1344
1345 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1346 rx_sc;
1347 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1348 if (rx_sc->sci == sci) {
1349 if (rx_sc->active)
1350 secy->n_rx_sc--;
1351 rcu_assign_pointer(*rx_scp, rx_sc->next);
1352 return rx_sc;
1353 }
1354 }
1355
1356 return NULL;
1357 }
1358
1359 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1360 {
1361 struct macsec_rx_sc *rx_sc;
1362 struct macsec_dev *macsec;
1363 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1364 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1365 struct macsec_secy *secy;
1366
1367 list_for_each_entry(macsec, &rxd->secys, secys) {
1368 if (find_rx_sc_rtnl(&macsec->secy, sci))
1369 return ERR_PTR(-EEXIST);
1370 }
1371
1372 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1373 if (!rx_sc)
1374 return ERR_PTR(-ENOMEM);
1375
1376 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1377 if (!rx_sc->stats) {
1378 kfree(rx_sc);
1379 return ERR_PTR(-ENOMEM);
1380 }
1381
1382 rx_sc->sci = sci;
1383 rx_sc->active = true;
1384 atomic_set(&rx_sc->refcnt, 1);
1385
1386 secy = &macsec_priv(dev)->secy;
1387 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1388 rcu_assign_pointer(secy->rx_sc, rx_sc);
1389
1390 if (rx_sc->active)
1391 secy->n_rx_sc++;
1392
1393 return rx_sc;
1394 }
1395
1396 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1397 int icv_len)
1398 {
1399 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1400 if (!tx_sa->stats)
1401 return -ENOMEM;
1402
1403 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1404 if (IS_ERR(tx_sa->key.tfm)) {
1405 free_percpu(tx_sa->stats);
1406 return PTR_ERR(tx_sa->key.tfm);
1407 }
1408
1409 tx_sa->active = false;
1410 atomic_set(&tx_sa->refcnt, 1);
1411 spin_lock_init(&tx_sa->lock);
1412
1413 return 0;
1414 }
1415
1416 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1417 {
1418 tx_sa->active = false;
1419
1420 macsec_txsa_put(tx_sa);
1421 }
1422
1423 static struct genl_family macsec_fam = {
1424 .id = GENL_ID_GENERATE,
1425 .name = MACSEC_GENL_NAME,
1426 .hdrsize = 0,
1427 .version = MACSEC_GENL_VERSION,
1428 .maxattr = MACSEC_ATTR_MAX,
1429 .netnsok = true,
1430 };
1431
1432 static struct net_device *get_dev_from_nl(struct net *net,
1433 struct nlattr **attrs)
1434 {
1435 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1436 struct net_device *dev;
1437
1438 dev = __dev_get_by_index(net, ifindex);
1439 if (!dev)
1440 return ERR_PTR(-ENODEV);
1441
1442 if (!netif_is_macsec(dev))
1443 return ERR_PTR(-ENODEV);
1444
1445 return dev;
1446 }
1447
1448 static sci_t nla_get_sci(const struct nlattr *nla)
1449 {
1450 return (__force sci_t)nla_get_u64(nla);
1451 }
1452
1453 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1454 int padattr)
1455 {
1456 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1457 }
1458
1459 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1460 struct nlattr **attrs,
1461 struct nlattr **tb_sa,
1462 struct net_device **devp,
1463 struct macsec_secy **secyp,
1464 struct macsec_tx_sc **scp,
1465 u8 *assoc_num)
1466 {
1467 struct net_device *dev;
1468 struct macsec_secy *secy;
1469 struct macsec_tx_sc *tx_sc;
1470 struct macsec_tx_sa *tx_sa;
1471
1472 if (!tb_sa[MACSEC_SA_ATTR_AN])
1473 return ERR_PTR(-EINVAL);
1474
1475 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1476
1477 dev = get_dev_from_nl(net, attrs);
1478 if (IS_ERR(dev))
1479 return ERR_CAST(dev);
1480
1481 if (*assoc_num >= MACSEC_NUM_AN)
1482 return ERR_PTR(-EINVAL);
1483
1484 secy = &macsec_priv(dev)->secy;
1485 tx_sc = &secy->tx_sc;
1486
1487 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1488 if (!tx_sa)
1489 return ERR_PTR(-ENODEV);
1490
1491 *devp = dev;
1492 *scp = tx_sc;
1493 *secyp = secy;
1494 return tx_sa;
1495 }
1496
1497 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1498 struct nlattr **attrs,
1499 struct nlattr **tb_rxsc,
1500 struct net_device **devp,
1501 struct macsec_secy **secyp)
1502 {
1503 struct net_device *dev;
1504 struct macsec_secy *secy;
1505 struct macsec_rx_sc *rx_sc;
1506 sci_t sci;
1507
1508 dev = get_dev_from_nl(net, attrs);
1509 if (IS_ERR(dev))
1510 return ERR_CAST(dev);
1511
1512 secy = &macsec_priv(dev)->secy;
1513
1514 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1515 return ERR_PTR(-EINVAL);
1516
1517 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1518 rx_sc = find_rx_sc_rtnl(secy, sci);
1519 if (!rx_sc)
1520 return ERR_PTR(-ENODEV);
1521
1522 *secyp = secy;
1523 *devp = dev;
1524
1525 return rx_sc;
1526 }
1527
1528 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1529 struct nlattr **attrs,
1530 struct nlattr **tb_rxsc,
1531 struct nlattr **tb_sa,
1532 struct net_device **devp,
1533 struct macsec_secy **secyp,
1534 struct macsec_rx_sc **scp,
1535 u8 *assoc_num)
1536 {
1537 struct macsec_rx_sc *rx_sc;
1538 struct macsec_rx_sa *rx_sa;
1539
1540 if (!tb_sa[MACSEC_SA_ATTR_AN])
1541 return ERR_PTR(-EINVAL);
1542
1543 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1544 if (*assoc_num >= MACSEC_NUM_AN)
1545 return ERR_PTR(-EINVAL);
1546
1547 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1548 if (IS_ERR(rx_sc))
1549 return ERR_CAST(rx_sc);
1550
1551 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1552 if (!rx_sa)
1553 return ERR_PTR(-ENODEV);
1554
1555 *scp = rx_sc;
1556 return rx_sa;
1557 }
1558
1559
1560 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1561 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1562 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1563 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1564 };
1565
1566 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1567 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1568 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1569 };
1570
1571 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1572 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1573 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1574 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1575 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1576 .len = MACSEC_KEYID_LEN, },
1577 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1578 .len = MACSEC_MAX_KEY_LEN, },
1579 };
1580
1581 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1582 {
1583 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1584 return -EINVAL;
1585
1586 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG],
1587 macsec_genl_sa_policy))
1588 return -EINVAL;
1589
1590 return 0;
1591 }
1592
1593 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1594 {
1595 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1596 return -EINVAL;
1597
1598 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG],
1599 macsec_genl_rxsc_policy))
1600 return -EINVAL;
1601
1602 return 0;
1603 }
1604
1605 static bool validate_add_rxsa(struct nlattr **attrs)
1606 {
1607 if (!attrs[MACSEC_SA_ATTR_AN] ||
1608 !attrs[MACSEC_SA_ATTR_KEY] ||
1609 !attrs[MACSEC_SA_ATTR_KEYID])
1610 return false;
1611
1612 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1613 return false;
1614
1615 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1616 return false;
1617
1618 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1619 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1620 return false;
1621 }
1622
1623 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1624 return false;
1625
1626 return true;
1627 }
1628
1629 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1630 {
1631 struct net_device *dev;
1632 struct nlattr **attrs = info->attrs;
1633 struct macsec_secy *secy;
1634 struct macsec_rx_sc *rx_sc;
1635 struct macsec_rx_sa *rx_sa;
1636 unsigned char assoc_num;
1637 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1638 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1639 int err;
1640
1641 if (!attrs[MACSEC_ATTR_IFINDEX])
1642 return -EINVAL;
1643
1644 if (parse_sa_config(attrs, tb_sa))
1645 return -EINVAL;
1646
1647 if (parse_rxsc_config(attrs, tb_rxsc))
1648 return -EINVAL;
1649
1650 if (!validate_add_rxsa(tb_sa))
1651 return -EINVAL;
1652
1653 rtnl_lock();
1654 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1655 if (IS_ERR(rx_sc)) {
1656 rtnl_unlock();
1657 return PTR_ERR(rx_sc);
1658 }
1659
1660 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1661
1662 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1663 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1664 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1665 rtnl_unlock();
1666 return -EINVAL;
1667 }
1668
1669 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1670 if (rx_sa) {
1671 rtnl_unlock();
1672 return -EBUSY;
1673 }
1674
1675 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1676 if (!rx_sa) {
1677 rtnl_unlock();
1678 return -ENOMEM;
1679 }
1680
1681 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1682 secy->key_len, secy->icv_len);
1683 if (err < 0) {
1684 kfree(rx_sa);
1685 rtnl_unlock();
1686 return err;
1687 }
1688
1689 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1690 spin_lock_bh(&rx_sa->lock);
1691 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1692 spin_unlock_bh(&rx_sa->lock);
1693 }
1694
1695 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1696 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1697
1698 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1699 rx_sa->sc = rx_sc;
1700 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1701
1702 rtnl_unlock();
1703
1704 return 0;
1705 }
1706
1707 static bool validate_add_rxsc(struct nlattr **attrs)
1708 {
1709 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1710 return false;
1711
1712 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1713 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1714 return false;
1715 }
1716
1717 return true;
1718 }
1719
1720 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1721 {
1722 struct net_device *dev;
1723 sci_t sci = MACSEC_UNDEF_SCI;
1724 struct nlattr **attrs = info->attrs;
1725 struct macsec_rx_sc *rx_sc;
1726 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1727
1728 if (!attrs[MACSEC_ATTR_IFINDEX])
1729 return -EINVAL;
1730
1731 if (parse_rxsc_config(attrs, tb_rxsc))
1732 return -EINVAL;
1733
1734 if (!validate_add_rxsc(tb_rxsc))
1735 return -EINVAL;
1736
1737 rtnl_lock();
1738 dev = get_dev_from_nl(genl_info_net(info), attrs);
1739 if (IS_ERR(dev)) {
1740 rtnl_unlock();
1741 return PTR_ERR(dev);
1742 }
1743
1744 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1745
1746 rx_sc = create_rx_sc(dev, sci);
1747 if (IS_ERR(rx_sc)) {
1748 rtnl_unlock();
1749 return PTR_ERR(rx_sc);
1750 }
1751
1752 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1753 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1754
1755 rtnl_unlock();
1756
1757 return 0;
1758 }
1759
1760 static bool validate_add_txsa(struct nlattr **attrs)
1761 {
1762 if (!attrs[MACSEC_SA_ATTR_AN] ||
1763 !attrs[MACSEC_SA_ATTR_PN] ||
1764 !attrs[MACSEC_SA_ATTR_KEY] ||
1765 !attrs[MACSEC_SA_ATTR_KEYID])
1766 return false;
1767
1768 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1769 return false;
1770
1771 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1772 return false;
1773
1774 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1775 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1776 return false;
1777 }
1778
1779 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1780 return false;
1781
1782 return true;
1783 }
1784
1785 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1786 {
1787 struct net_device *dev;
1788 struct nlattr **attrs = info->attrs;
1789 struct macsec_secy *secy;
1790 struct macsec_tx_sc *tx_sc;
1791 struct macsec_tx_sa *tx_sa;
1792 unsigned char assoc_num;
1793 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1794 int err;
1795
1796 if (!attrs[MACSEC_ATTR_IFINDEX])
1797 return -EINVAL;
1798
1799 if (parse_sa_config(attrs, tb_sa))
1800 return -EINVAL;
1801
1802 if (!validate_add_txsa(tb_sa))
1803 return -EINVAL;
1804
1805 rtnl_lock();
1806 dev = get_dev_from_nl(genl_info_net(info), attrs);
1807 if (IS_ERR(dev)) {
1808 rtnl_unlock();
1809 return PTR_ERR(dev);
1810 }
1811
1812 secy = &macsec_priv(dev)->secy;
1813 tx_sc = &secy->tx_sc;
1814
1815 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1816
1817 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1818 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1819 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1820 rtnl_unlock();
1821 return -EINVAL;
1822 }
1823
1824 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1825 if (tx_sa) {
1826 rtnl_unlock();
1827 return -EBUSY;
1828 }
1829
1830 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1831 if (!tx_sa) {
1832 rtnl_unlock();
1833 return -ENOMEM;
1834 }
1835
1836 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1837 secy->key_len, secy->icv_len);
1838 if (err < 0) {
1839 kfree(tx_sa);
1840 rtnl_unlock();
1841 return err;
1842 }
1843
1844 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1845
1846 spin_lock_bh(&tx_sa->lock);
1847 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1848 spin_unlock_bh(&tx_sa->lock);
1849
1850 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1851 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1852
1853 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1854 secy->operational = true;
1855
1856 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1857
1858 rtnl_unlock();
1859
1860 return 0;
1861 }
1862
1863 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1864 {
1865 struct nlattr **attrs = info->attrs;
1866 struct net_device *dev;
1867 struct macsec_secy *secy;
1868 struct macsec_rx_sc *rx_sc;
1869 struct macsec_rx_sa *rx_sa;
1870 u8 assoc_num;
1871 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1872 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1873
1874 if (!attrs[MACSEC_ATTR_IFINDEX])
1875 return -EINVAL;
1876
1877 if (parse_sa_config(attrs, tb_sa))
1878 return -EINVAL;
1879
1880 if (parse_rxsc_config(attrs, tb_rxsc))
1881 return -EINVAL;
1882
1883 rtnl_lock();
1884 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1885 &dev, &secy, &rx_sc, &assoc_num);
1886 if (IS_ERR(rx_sa)) {
1887 rtnl_unlock();
1888 return PTR_ERR(rx_sa);
1889 }
1890
1891 if (rx_sa->active) {
1892 rtnl_unlock();
1893 return -EBUSY;
1894 }
1895
1896 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1897 clear_rx_sa(rx_sa);
1898
1899 rtnl_unlock();
1900
1901 return 0;
1902 }
1903
1904 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1905 {
1906 struct nlattr **attrs = info->attrs;
1907 struct net_device *dev;
1908 struct macsec_secy *secy;
1909 struct macsec_rx_sc *rx_sc;
1910 sci_t sci;
1911 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1912
1913 if (!attrs[MACSEC_ATTR_IFINDEX])
1914 return -EINVAL;
1915
1916 if (parse_rxsc_config(attrs, tb_rxsc))
1917 return -EINVAL;
1918
1919 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1920 return -EINVAL;
1921
1922 rtnl_lock();
1923 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1924 if (IS_ERR(dev)) {
1925 rtnl_unlock();
1926 return PTR_ERR(dev);
1927 }
1928
1929 secy = &macsec_priv(dev)->secy;
1930 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1931
1932 rx_sc = del_rx_sc(secy, sci);
1933 if (!rx_sc) {
1934 rtnl_unlock();
1935 return -ENODEV;
1936 }
1937
1938 free_rx_sc(rx_sc);
1939 rtnl_unlock();
1940
1941 return 0;
1942 }
1943
1944 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1945 {
1946 struct nlattr **attrs = info->attrs;
1947 struct net_device *dev;
1948 struct macsec_secy *secy;
1949 struct macsec_tx_sc *tx_sc;
1950 struct macsec_tx_sa *tx_sa;
1951 u8 assoc_num;
1952 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1953
1954 if (!attrs[MACSEC_ATTR_IFINDEX])
1955 return -EINVAL;
1956
1957 if (parse_sa_config(attrs, tb_sa))
1958 return -EINVAL;
1959
1960 rtnl_lock();
1961 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1962 &dev, &secy, &tx_sc, &assoc_num);
1963 if (IS_ERR(tx_sa)) {
1964 rtnl_unlock();
1965 return PTR_ERR(tx_sa);
1966 }
1967
1968 if (tx_sa->active) {
1969 rtnl_unlock();
1970 return -EBUSY;
1971 }
1972
1973 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
1974 clear_tx_sa(tx_sa);
1975
1976 rtnl_unlock();
1977
1978 return 0;
1979 }
1980
1981 static bool validate_upd_sa(struct nlattr **attrs)
1982 {
1983 if (!attrs[MACSEC_SA_ATTR_AN] ||
1984 attrs[MACSEC_SA_ATTR_KEY] ||
1985 attrs[MACSEC_SA_ATTR_KEYID])
1986 return false;
1987
1988 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1989 return false;
1990
1991 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1992 return false;
1993
1994 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1995 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1996 return false;
1997 }
1998
1999 return true;
2000 }
2001
2002 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2003 {
2004 struct nlattr **attrs = info->attrs;
2005 struct net_device *dev;
2006 struct macsec_secy *secy;
2007 struct macsec_tx_sc *tx_sc;
2008 struct macsec_tx_sa *tx_sa;
2009 u8 assoc_num;
2010 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2011
2012 if (!attrs[MACSEC_ATTR_IFINDEX])
2013 return -EINVAL;
2014
2015 if (parse_sa_config(attrs, tb_sa))
2016 return -EINVAL;
2017
2018 if (!validate_upd_sa(tb_sa))
2019 return -EINVAL;
2020
2021 rtnl_lock();
2022 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2023 &dev, &secy, &tx_sc, &assoc_num);
2024 if (IS_ERR(tx_sa)) {
2025 rtnl_unlock();
2026 return PTR_ERR(tx_sa);
2027 }
2028
2029 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2030 spin_lock_bh(&tx_sa->lock);
2031 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2032 spin_unlock_bh(&tx_sa->lock);
2033 }
2034
2035 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2036 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2037
2038 if (assoc_num == tx_sc->encoding_sa)
2039 secy->operational = tx_sa->active;
2040
2041 rtnl_unlock();
2042
2043 return 0;
2044 }
2045
2046 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2047 {
2048 struct nlattr **attrs = info->attrs;
2049 struct net_device *dev;
2050 struct macsec_secy *secy;
2051 struct macsec_rx_sc *rx_sc;
2052 struct macsec_rx_sa *rx_sa;
2053 u8 assoc_num;
2054 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2055 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2056
2057 if (!attrs[MACSEC_ATTR_IFINDEX])
2058 return -EINVAL;
2059
2060 if (parse_rxsc_config(attrs, tb_rxsc))
2061 return -EINVAL;
2062
2063 if (parse_sa_config(attrs, tb_sa))
2064 return -EINVAL;
2065
2066 if (!validate_upd_sa(tb_sa))
2067 return -EINVAL;
2068
2069 rtnl_lock();
2070 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2071 &dev, &secy, &rx_sc, &assoc_num);
2072 if (IS_ERR(rx_sa)) {
2073 rtnl_unlock();
2074 return PTR_ERR(rx_sa);
2075 }
2076
2077 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2078 spin_lock_bh(&rx_sa->lock);
2079 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2080 spin_unlock_bh(&rx_sa->lock);
2081 }
2082
2083 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2084 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2085
2086 rtnl_unlock();
2087 return 0;
2088 }
2089
2090 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2091 {
2092 struct nlattr **attrs = info->attrs;
2093 struct net_device *dev;
2094 struct macsec_secy *secy;
2095 struct macsec_rx_sc *rx_sc;
2096 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2097
2098 if (!attrs[MACSEC_ATTR_IFINDEX])
2099 return -EINVAL;
2100
2101 if (parse_rxsc_config(attrs, tb_rxsc))
2102 return -EINVAL;
2103
2104 if (!validate_add_rxsc(tb_rxsc))
2105 return -EINVAL;
2106
2107 rtnl_lock();
2108 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2109 if (IS_ERR(rx_sc)) {
2110 rtnl_unlock();
2111 return PTR_ERR(rx_sc);
2112 }
2113
2114 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2115 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2116
2117 if (rx_sc->active != new)
2118 secy->n_rx_sc += new ? 1 : -1;
2119
2120 rx_sc->active = new;
2121 }
2122
2123 rtnl_unlock();
2124
2125 return 0;
2126 }
2127
2128 static int copy_tx_sa_stats(struct sk_buff *skb,
2129 struct macsec_tx_sa_stats __percpu *pstats)
2130 {
2131 struct macsec_tx_sa_stats sum = {0, };
2132 int cpu;
2133
2134 for_each_possible_cpu(cpu) {
2135 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2136
2137 sum.OutPktsProtected += stats->OutPktsProtected;
2138 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2139 }
2140
2141 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2142 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2143 return -EMSGSIZE;
2144
2145 return 0;
2146 }
2147
2148 static int copy_rx_sa_stats(struct sk_buff *skb,
2149 struct macsec_rx_sa_stats __percpu *pstats)
2150 {
2151 struct macsec_rx_sa_stats sum = {0, };
2152 int cpu;
2153
2154 for_each_possible_cpu(cpu) {
2155 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2156
2157 sum.InPktsOK += stats->InPktsOK;
2158 sum.InPktsInvalid += stats->InPktsInvalid;
2159 sum.InPktsNotValid += stats->InPktsNotValid;
2160 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2161 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2162 }
2163
2164 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2165 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2166 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2167 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2168 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2169 return -EMSGSIZE;
2170
2171 return 0;
2172 }
2173
2174 static int copy_rx_sc_stats(struct sk_buff *skb,
2175 struct pcpu_rx_sc_stats __percpu *pstats)
2176 {
2177 struct macsec_rx_sc_stats sum = {0, };
2178 int cpu;
2179
2180 for_each_possible_cpu(cpu) {
2181 const struct pcpu_rx_sc_stats *stats;
2182 struct macsec_rx_sc_stats tmp;
2183 unsigned int start;
2184
2185 stats = per_cpu_ptr(pstats, cpu);
2186 do {
2187 start = u64_stats_fetch_begin_irq(&stats->syncp);
2188 memcpy(&tmp, &stats->stats, sizeof(tmp));
2189 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2190
2191 sum.InOctetsValidated += tmp.InOctetsValidated;
2192 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2193 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2194 sum.InPktsDelayed += tmp.InPktsDelayed;
2195 sum.InPktsOK += tmp.InPktsOK;
2196 sum.InPktsInvalid += tmp.InPktsInvalid;
2197 sum.InPktsLate += tmp.InPktsLate;
2198 sum.InPktsNotValid += tmp.InPktsNotValid;
2199 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2200 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2201 }
2202
2203 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2204 sum.InOctetsValidated,
2205 MACSEC_RXSC_STATS_ATTR_PAD) ||
2206 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2207 sum.InOctetsDecrypted,
2208 MACSEC_RXSC_STATS_ATTR_PAD) ||
2209 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2210 sum.InPktsUnchecked,
2211 MACSEC_RXSC_STATS_ATTR_PAD) ||
2212 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2213 sum.InPktsDelayed,
2214 MACSEC_RXSC_STATS_ATTR_PAD) ||
2215 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2216 sum.InPktsOK,
2217 MACSEC_RXSC_STATS_ATTR_PAD) ||
2218 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2219 sum.InPktsInvalid,
2220 MACSEC_RXSC_STATS_ATTR_PAD) ||
2221 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2222 sum.InPktsLate,
2223 MACSEC_RXSC_STATS_ATTR_PAD) ||
2224 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2225 sum.InPktsNotValid,
2226 MACSEC_RXSC_STATS_ATTR_PAD) ||
2227 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2228 sum.InPktsNotUsingSA,
2229 MACSEC_RXSC_STATS_ATTR_PAD) ||
2230 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2231 sum.InPktsUnusedSA,
2232 MACSEC_RXSC_STATS_ATTR_PAD))
2233 return -EMSGSIZE;
2234
2235 return 0;
2236 }
2237
2238 static int copy_tx_sc_stats(struct sk_buff *skb,
2239 struct pcpu_tx_sc_stats __percpu *pstats)
2240 {
2241 struct macsec_tx_sc_stats sum = {0, };
2242 int cpu;
2243
2244 for_each_possible_cpu(cpu) {
2245 const struct pcpu_tx_sc_stats *stats;
2246 struct macsec_tx_sc_stats tmp;
2247 unsigned int start;
2248
2249 stats = per_cpu_ptr(pstats, cpu);
2250 do {
2251 start = u64_stats_fetch_begin_irq(&stats->syncp);
2252 memcpy(&tmp, &stats->stats, sizeof(tmp));
2253 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2254
2255 sum.OutPktsProtected += tmp.OutPktsProtected;
2256 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2257 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2258 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2259 }
2260
2261 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2262 sum.OutPktsProtected,
2263 MACSEC_TXSC_STATS_ATTR_PAD) ||
2264 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2265 sum.OutPktsEncrypted,
2266 MACSEC_TXSC_STATS_ATTR_PAD) ||
2267 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2268 sum.OutOctetsProtected,
2269 MACSEC_TXSC_STATS_ATTR_PAD) ||
2270 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2271 sum.OutOctetsEncrypted,
2272 MACSEC_TXSC_STATS_ATTR_PAD))
2273 return -EMSGSIZE;
2274
2275 return 0;
2276 }
2277
2278 static int copy_secy_stats(struct sk_buff *skb,
2279 struct pcpu_secy_stats __percpu *pstats)
2280 {
2281 struct macsec_dev_stats sum = {0, };
2282 int cpu;
2283
2284 for_each_possible_cpu(cpu) {
2285 const struct pcpu_secy_stats *stats;
2286 struct macsec_dev_stats tmp;
2287 unsigned int start;
2288
2289 stats = per_cpu_ptr(pstats, cpu);
2290 do {
2291 start = u64_stats_fetch_begin_irq(&stats->syncp);
2292 memcpy(&tmp, &stats->stats, sizeof(tmp));
2293 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2294
2295 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2296 sum.InPktsUntagged += tmp.InPktsUntagged;
2297 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2298 sum.InPktsNoTag += tmp.InPktsNoTag;
2299 sum.InPktsBadTag += tmp.InPktsBadTag;
2300 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2301 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2302 sum.InPktsOverrun += tmp.InPktsOverrun;
2303 }
2304
2305 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2306 sum.OutPktsUntagged,
2307 MACSEC_SECY_STATS_ATTR_PAD) ||
2308 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2309 sum.InPktsUntagged,
2310 MACSEC_SECY_STATS_ATTR_PAD) ||
2311 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2312 sum.OutPktsTooLong,
2313 MACSEC_SECY_STATS_ATTR_PAD) ||
2314 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2315 sum.InPktsNoTag,
2316 MACSEC_SECY_STATS_ATTR_PAD) ||
2317 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2318 sum.InPktsBadTag,
2319 MACSEC_SECY_STATS_ATTR_PAD) ||
2320 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2321 sum.InPktsUnknownSCI,
2322 MACSEC_SECY_STATS_ATTR_PAD) ||
2323 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2324 sum.InPktsNoSCI,
2325 MACSEC_SECY_STATS_ATTR_PAD) ||
2326 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2327 sum.InPktsOverrun,
2328 MACSEC_SECY_STATS_ATTR_PAD))
2329 return -EMSGSIZE;
2330
2331 return 0;
2332 }
2333
2334 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2335 {
2336 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2337 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2338
2339 if (!secy_nest)
2340 return 1;
2341
2342 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2343 MACSEC_SECY_ATTR_PAD) ||
2344 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2345 MACSEC_DEFAULT_CIPHER_ID,
2346 MACSEC_SECY_ATTR_PAD) ||
2347 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2348 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2349 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2350 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2351 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2352 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2353 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2354 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2355 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2356 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2357 goto cancel;
2358
2359 if (secy->replay_protect) {
2360 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2361 goto cancel;
2362 }
2363
2364 nla_nest_end(skb, secy_nest);
2365 return 0;
2366
2367 cancel:
2368 nla_nest_cancel(skb, secy_nest);
2369 return 1;
2370 }
2371
2372 static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2373 struct sk_buff *skb, struct netlink_callback *cb)
2374 {
2375 struct macsec_rx_sc *rx_sc;
2376 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2377 struct nlattr *txsa_list, *rxsc_list;
2378 int i, j;
2379 void *hdr;
2380 struct nlattr *attr;
2381
2382 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2383 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2384 if (!hdr)
2385 return -EMSGSIZE;
2386
2387 genl_dump_check_consistent(cb, hdr, &macsec_fam);
2388
2389 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2390 goto nla_put_failure;
2391
2392 if (nla_put_secy(secy, skb))
2393 goto nla_put_failure;
2394
2395 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2396 if (!attr)
2397 goto nla_put_failure;
2398 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2399 nla_nest_cancel(skb, attr);
2400 goto nla_put_failure;
2401 }
2402 nla_nest_end(skb, attr);
2403
2404 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2405 if (!attr)
2406 goto nla_put_failure;
2407 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2408 nla_nest_cancel(skb, attr);
2409 goto nla_put_failure;
2410 }
2411 nla_nest_end(skb, attr);
2412
2413 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2414 if (!txsa_list)
2415 goto nla_put_failure;
2416 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2417 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2418 struct nlattr *txsa_nest;
2419
2420 if (!tx_sa)
2421 continue;
2422
2423 txsa_nest = nla_nest_start(skb, j++);
2424 if (!txsa_nest) {
2425 nla_nest_cancel(skb, txsa_list);
2426 goto nla_put_failure;
2427 }
2428
2429 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2430 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2431 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2432 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2433 nla_nest_cancel(skb, txsa_nest);
2434 nla_nest_cancel(skb, txsa_list);
2435 goto nla_put_failure;
2436 }
2437
2438 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2439 if (!attr) {
2440 nla_nest_cancel(skb, txsa_nest);
2441 nla_nest_cancel(skb, txsa_list);
2442 goto nla_put_failure;
2443 }
2444 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2445 nla_nest_cancel(skb, attr);
2446 nla_nest_cancel(skb, txsa_nest);
2447 nla_nest_cancel(skb, txsa_list);
2448 goto nla_put_failure;
2449 }
2450 nla_nest_end(skb, attr);
2451
2452 nla_nest_end(skb, txsa_nest);
2453 }
2454 nla_nest_end(skb, txsa_list);
2455
2456 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2457 if (!rxsc_list)
2458 goto nla_put_failure;
2459
2460 j = 1;
2461 for_each_rxsc_rtnl(secy, rx_sc) {
2462 int k;
2463 struct nlattr *rxsa_list;
2464 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2465
2466 if (!rxsc_nest) {
2467 nla_nest_cancel(skb, rxsc_list);
2468 goto nla_put_failure;
2469 }
2470
2471 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2472 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
2473 MACSEC_RXSC_ATTR_PAD)) {
2474 nla_nest_cancel(skb, rxsc_nest);
2475 nla_nest_cancel(skb, rxsc_list);
2476 goto nla_put_failure;
2477 }
2478
2479 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2480 if (!attr) {
2481 nla_nest_cancel(skb, rxsc_nest);
2482 nla_nest_cancel(skb, rxsc_list);
2483 goto nla_put_failure;
2484 }
2485 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2486 nla_nest_cancel(skb, attr);
2487 nla_nest_cancel(skb, rxsc_nest);
2488 nla_nest_cancel(skb, rxsc_list);
2489 goto nla_put_failure;
2490 }
2491 nla_nest_end(skb, attr);
2492
2493 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2494 if (!rxsa_list) {
2495 nla_nest_cancel(skb, rxsc_nest);
2496 nla_nest_cancel(skb, rxsc_list);
2497 goto nla_put_failure;
2498 }
2499
2500 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2501 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2502 struct nlattr *rxsa_nest;
2503
2504 if (!rx_sa)
2505 continue;
2506
2507 rxsa_nest = nla_nest_start(skb, k++);
2508 if (!rxsa_nest) {
2509 nla_nest_cancel(skb, rxsa_list);
2510 nla_nest_cancel(skb, rxsc_nest);
2511 nla_nest_cancel(skb, rxsc_list);
2512 goto nla_put_failure;
2513 }
2514
2515 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2516 if (!attr) {
2517 nla_nest_cancel(skb, rxsa_list);
2518 nla_nest_cancel(skb, rxsc_nest);
2519 nla_nest_cancel(skb, rxsc_list);
2520 goto nla_put_failure;
2521 }
2522 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2523 nla_nest_cancel(skb, attr);
2524 nla_nest_cancel(skb, rxsa_list);
2525 nla_nest_cancel(skb, rxsc_nest);
2526 nla_nest_cancel(skb, rxsc_list);
2527 goto nla_put_failure;
2528 }
2529 nla_nest_end(skb, attr);
2530
2531 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2532 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2533 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2534 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2535 nla_nest_cancel(skb, rxsa_nest);
2536 nla_nest_cancel(skb, rxsc_nest);
2537 nla_nest_cancel(skb, rxsc_list);
2538 goto nla_put_failure;
2539 }
2540 nla_nest_end(skb, rxsa_nest);
2541 }
2542
2543 nla_nest_end(skb, rxsa_list);
2544 nla_nest_end(skb, rxsc_nest);
2545 }
2546
2547 nla_nest_end(skb, rxsc_list);
2548
2549 genlmsg_end(skb, hdr);
2550
2551 return 0;
2552
2553 nla_put_failure:
2554 genlmsg_cancel(skb, hdr);
2555 return -EMSGSIZE;
2556 }
2557
2558 static int macsec_generation = 1; /* protected by RTNL */
2559
2560 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2561 {
2562 struct net *net = sock_net(skb->sk);
2563 struct net_device *dev;
2564 int dev_idx, d;
2565
2566 dev_idx = cb->args[0];
2567
2568 d = 0;
2569 rtnl_lock();
2570
2571 cb->seq = macsec_generation;
2572
2573 for_each_netdev(net, dev) {
2574 struct macsec_secy *secy;
2575
2576 if (d < dev_idx)
2577 goto next;
2578
2579 if (!netif_is_macsec(dev))
2580 goto next;
2581
2582 secy = &macsec_priv(dev)->secy;
2583 if (dump_secy(secy, dev, skb, cb) < 0)
2584 goto done;
2585 next:
2586 d++;
2587 }
2588
2589 done:
2590 rtnl_unlock();
2591 cb->args[0] = d;
2592 return skb->len;
2593 }
2594
2595 static const struct genl_ops macsec_genl_ops[] = {
2596 {
2597 .cmd = MACSEC_CMD_GET_TXSC,
2598 .dumpit = macsec_dump_txsc,
2599 .policy = macsec_genl_policy,
2600 },
2601 {
2602 .cmd = MACSEC_CMD_ADD_RXSC,
2603 .doit = macsec_add_rxsc,
2604 .policy = macsec_genl_policy,
2605 .flags = GENL_ADMIN_PERM,
2606 },
2607 {
2608 .cmd = MACSEC_CMD_DEL_RXSC,
2609 .doit = macsec_del_rxsc,
2610 .policy = macsec_genl_policy,
2611 .flags = GENL_ADMIN_PERM,
2612 },
2613 {
2614 .cmd = MACSEC_CMD_UPD_RXSC,
2615 .doit = macsec_upd_rxsc,
2616 .policy = macsec_genl_policy,
2617 .flags = GENL_ADMIN_PERM,
2618 },
2619 {
2620 .cmd = MACSEC_CMD_ADD_TXSA,
2621 .doit = macsec_add_txsa,
2622 .policy = macsec_genl_policy,
2623 .flags = GENL_ADMIN_PERM,
2624 },
2625 {
2626 .cmd = MACSEC_CMD_DEL_TXSA,
2627 .doit = macsec_del_txsa,
2628 .policy = macsec_genl_policy,
2629 .flags = GENL_ADMIN_PERM,
2630 },
2631 {
2632 .cmd = MACSEC_CMD_UPD_TXSA,
2633 .doit = macsec_upd_txsa,
2634 .policy = macsec_genl_policy,
2635 .flags = GENL_ADMIN_PERM,
2636 },
2637 {
2638 .cmd = MACSEC_CMD_ADD_RXSA,
2639 .doit = macsec_add_rxsa,
2640 .policy = macsec_genl_policy,
2641 .flags = GENL_ADMIN_PERM,
2642 },
2643 {
2644 .cmd = MACSEC_CMD_DEL_RXSA,
2645 .doit = macsec_del_rxsa,
2646 .policy = macsec_genl_policy,
2647 .flags = GENL_ADMIN_PERM,
2648 },
2649 {
2650 .cmd = MACSEC_CMD_UPD_RXSA,
2651 .doit = macsec_upd_rxsa,
2652 .policy = macsec_genl_policy,
2653 .flags = GENL_ADMIN_PERM,
2654 },
2655 };
2656
2657 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2658 struct net_device *dev)
2659 {
2660 struct macsec_dev *macsec = netdev_priv(dev);
2661 struct macsec_secy *secy = &macsec->secy;
2662 struct pcpu_secy_stats *secy_stats;
2663 int ret, len;
2664
2665 /* 10.5 */
2666 if (!secy->protect_frames) {
2667 secy_stats = this_cpu_ptr(macsec->stats);
2668 u64_stats_update_begin(&secy_stats->syncp);
2669 secy_stats->stats.OutPktsUntagged++;
2670 u64_stats_update_end(&secy_stats->syncp);
2671 skb->dev = macsec->real_dev;
2672 len = skb->len;
2673 ret = dev_queue_xmit(skb);
2674 count_tx(dev, ret, len);
2675 return ret;
2676 }
2677
2678 if (!secy->operational) {
2679 kfree_skb(skb);
2680 dev->stats.tx_dropped++;
2681 return NETDEV_TX_OK;
2682 }
2683
2684 skb = macsec_encrypt(skb, dev);
2685 if (IS_ERR(skb)) {
2686 if (PTR_ERR(skb) != -EINPROGRESS)
2687 dev->stats.tx_dropped++;
2688 return NETDEV_TX_OK;
2689 }
2690
2691 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2692
2693 macsec_encrypt_finish(skb, dev);
2694 len = skb->len;
2695 ret = dev_queue_xmit(skb);
2696 count_tx(dev, ret, len);
2697 return ret;
2698 }
2699
2700 #define MACSEC_FEATURES \
2701 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2702 static int macsec_dev_init(struct net_device *dev)
2703 {
2704 struct macsec_dev *macsec = macsec_priv(dev);
2705 struct net_device *real_dev = macsec->real_dev;
2706 int err;
2707
2708 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2709 if (!dev->tstats)
2710 return -ENOMEM;
2711
2712 err = gro_cells_init(&macsec->gro_cells, dev);
2713 if (err) {
2714 free_percpu(dev->tstats);
2715 return err;
2716 }
2717
2718 dev->features = real_dev->features & MACSEC_FEATURES;
2719 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2720
2721 dev->needed_headroom = real_dev->needed_headroom +
2722 MACSEC_NEEDED_HEADROOM;
2723 dev->needed_tailroom = real_dev->needed_tailroom +
2724 MACSEC_NEEDED_TAILROOM;
2725
2726 if (is_zero_ether_addr(dev->dev_addr))
2727 eth_hw_addr_inherit(dev, real_dev);
2728 if (is_zero_ether_addr(dev->broadcast))
2729 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2730
2731 return 0;
2732 }
2733
2734 static void macsec_dev_uninit(struct net_device *dev)
2735 {
2736 struct macsec_dev *macsec = macsec_priv(dev);
2737
2738 gro_cells_destroy(&macsec->gro_cells);
2739 free_percpu(dev->tstats);
2740 }
2741
2742 static netdev_features_t macsec_fix_features(struct net_device *dev,
2743 netdev_features_t features)
2744 {
2745 struct macsec_dev *macsec = macsec_priv(dev);
2746 struct net_device *real_dev = macsec->real_dev;
2747
2748 features &= (real_dev->features & MACSEC_FEATURES) |
2749 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
2750 features |= NETIF_F_LLTX;
2751
2752 return features;
2753 }
2754
2755 static int macsec_dev_open(struct net_device *dev)
2756 {
2757 struct macsec_dev *macsec = macsec_priv(dev);
2758 struct net_device *real_dev = macsec->real_dev;
2759 int err;
2760
2761 if (!(real_dev->flags & IFF_UP))
2762 return -ENETDOWN;
2763
2764 err = dev_uc_add(real_dev, dev->dev_addr);
2765 if (err < 0)
2766 return err;
2767
2768 if (dev->flags & IFF_ALLMULTI) {
2769 err = dev_set_allmulti(real_dev, 1);
2770 if (err < 0)
2771 goto del_unicast;
2772 }
2773
2774 if (dev->flags & IFF_PROMISC) {
2775 err = dev_set_promiscuity(real_dev, 1);
2776 if (err < 0)
2777 goto clear_allmulti;
2778 }
2779
2780 if (netif_carrier_ok(real_dev))
2781 netif_carrier_on(dev);
2782
2783 return 0;
2784 clear_allmulti:
2785 if (dev->flags & IFF_ALLMULTI)
2786 dev_set_allmulti(real_dev, -1);
2787 del_unicast:
2788 dev_uc_del(real_dev, dev->dev_addr);
2789 netif_carrier_off(dev);
2790 return err;
2791 }
2792
2793 static int macsec_dev_stop(struct net_device *dev)
2794 {
2795 struct macsec_dev *macsec = macsec_priv(dev);
2796 struct net_device *real_dev = macsec->real_dev;
2797
2798 netif_carrier_off(dev);
2799
2800 dev_mc_unsync(real_dev, dev);
2801 dev_uc_unsync(real_dev, dev);
2802
2803 if (dev->flags & IFF_ALLMULTI)
2804 dev_set_allmulti(real_dev, -1);
2805
2806 if (dev->flags & IFF_PROMISC)
2807 dev_set_promiscuity(real_dev, -1);
2808
2809 dev_uc_del(real_dev, dev->dev_addr);
2810
2811 return 0;
2812 }
2813
2814 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2815 {
2816 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2817
2818 if (!(dev->flags & IFF_UP))
2819 return;
2820
2821 if (change & IFF_ALLMULTI)
2822 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2823
2824 if (change & IFF_PROMISC)
2825 dev_set_promiscuity(real_dev,
2826 dev->flags & IFF_PROMISC ? 1 : -1);
2827 }
2828
2829 static void macsec_dev_set_rx_mode(struct net_device *dev)
2830 {
2831 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2832
2833 dev_mc_sync(real_dev, dev);
2834 dev_uc_sync(real_dev, dev);
2835 }
2836
2837 static int macsec_set_mac_address(struct net_device *dev, void *p)
2838 {
2839 struct macsec_dev *macsec = macsec_priv(dev);
2840 struct net_device *real_dev = macsec->real_dev;
2841 struct sockaddr *addr = p;
2842 int err;
2843
2844 if (!is_valid_ether_addr(addr->sa_data))
2845 return -EADDRNOTAVAIL;
2846
2847 if (!(dev->flags & IFF_UP))
2848 goto out;
2849
2850 err = dev_uc_add(real_dev, addr->sa_data);
2851 if (err < 0)
2852 return err;
2853
2854 dev_uc_del(real_dev, dev->dev_addr);
2855
2856 out:
2857 ether_addr_copy(dev->dev_addr, addr->sa_data);
2858 return 0;
2859 }
2860
2861 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2862 {
2863 struct macsec_dev *macsec = macsec_priv(dev);
2864 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2865
2866 if (macsec->real_dev->mtu - extra < new_mtu)
2867 return -ERANGE;
2868
2869 dev->mtu = new_mtu;
2870
2871 return 0;
2872 }
2873
2874 static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev,
2875 struct rtnl_link_stats64 *s)
2876 {
2877 int cpu;
2878
2879 if (!dev->tstats)
2880 return s;
2881
2882 for_each_possible_cpu(cpu) {
2883 struct pcpu_sw_netstats *stats;
2884 struct pcpu_sw_netstats tmp;
2885 int start;
2886
2887 stats = per_cpu_ptr(dev->tstats, cpu);
2888 do {
2889 start = u64_stats_fetch_begin_irq(&stats->syncp);
2890 tmp.rx_packets = stats->rx_packets;
2891 tmp.rx_bytes = stats->rx_bytes;
2892 tmp.tx_packets = stats->tx_packets;
2893 tmp.tx_bytes = stats->tx_bytes;
2894 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2895
2896 s->rx_packets += tmp.rx_packets;
2897 s->rx_bytes += tmp.rx_bytes;
2898 s->tx_packets += tmp.tx_packets;
2899 s->tx_bytes += tmp.tx_bytes;
2900 }
2901
2902 s->rx_dropped = dev->stats.rx_dropped;
2903 s->tx_dropped = dev->stats.tx_dropped;
2904
2905 return s;
2906 }
2907
2908 static int macsec_get_iflink(const struct net_device *dev)
2909 {
2910 return macsec_priv(dev)->real_dev->ifindex;
2911 }
2912
2913 static const struct net_device_ops macsec_netdev_ops = {
2914 .ndo_init = macsec_dev_init,
2915 .ndo_uninit = macsec_dev_uninit,
2916 .ndo_open = macsec_dev_open,
2917 .ndo_stop = macsec_dev_stop,
2918 .ndo_fix_features = macsec_fix_features,
2919 .ndo_change_mtu = macsec_change_mtu,
2920 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2921 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2922 .ndo_set_mac_address = macsec_set_mac_address,
2923 .ndo_start_xmit = macsec_start_xmit,
2924 .ndo_get_stats64 = macsec_get_stats64,
2925 .ndo_get_iflink = macsec_get_iflink,
2926 };
2927
2928 static const struct device_type macsec_type = {
2929 .name = "macsec",
2930 };
2931
2932 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2933 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2934 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2935 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2936 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2937 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2938 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2939 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
2940 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
2941 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
2942 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
2943 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
2944 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
2945 };
2946
2947 static void macsec_free_netdev(struct net_device *dev)
2948 {
2949 struct macsec_dev *macsec = macsec_priv(dev);
2950 struct net_device *real_dev = macsec->real_dev;
2951
2952 free_percpu(macsec->stats);
2953 free_percpu(macsec->secy.tx_sc.stats);
2954
2955 dev_put(real_dev);
2956 free_netdev(dev);
2957 }
2958
2959 static void macsec_setup(struct net_device *dev)
2960 {
2961 ether_setup(dev);
2962 dev->priv_flags |= IFF_NO_QUEUE;
2963 dev->netdev_ops = &macsec_netdev_ops;
2964 dev->destructor = macsec_free_netdev;
2965
2966 eth_zero_addr(dev->broadcast);
2967 }
2968
2969 static void macsec_changelink_common(struct net_device *dev,
2970 struct nlattr *data[])
2971 {
2972 struct macsec_secy *secy;
2973 struct macsec_tx_sc *tx_sc;
2974
2975 secy = &macsec_priv(dev)->secy;
2976 tx_sc = &secy->tx_sc;
2977
2978 if (data[IFLA_MACSEC_ENCODING_SA]) {
2979 struct macsec_tx_sa *tx_sa;
2980
2981 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
2982 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
2983
2984 secy->operational = tx_sa && tx_sa->active;
2985 }
2986
2987 if (data[IFLA_MACSEC_WINDOW])
2988 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
2989
2990 if (data[IFLA_MACSEC_ENCRYPT])
2991 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
2992
2993 if (data[IFLA_MACSEC_PROTECT])
2994 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
2995
2996 if (data[IFLA_MACSEC_INC_SCI])
2997 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
2998
2999 if (data[IFLA_MACSEC_ES])
3000 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3001
3002 if (data[IFLA_MACSEC_SCB])
3003 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3004
3005 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3006 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3007
3008 if (data[IFLA_MACSEC_VALIDATION])
3009 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3010 }
3011
3012 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3013 struct nlattr *data[])
3014 {
3015 if (!data)
3016 return 0;
3017
3018 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3019 data[IFLA_MACSEC_ICV_LEN] ||
3020 data[IFLA_MACSEC_SCI] ||
3021 data[IFLA_MACSEC_PORT])
3022 return -EINVAL;
3023
3024 macsec_changelink_common(dev, data);
3025
3026 return 0;
3027 }
3028
3029 static void macsec_del_dev(struct macsec_dev *macsec)
3030 {
3031 int i;
3032
3033 while (macsec->secy.rx_sc) {
3034 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3035
3036 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3037 free_rx_sc(rx_sc);
3038 }
3039
3040 for (i = 0; i < MACSEC_NUM_AN; i++) {
3041 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3042
3043 if (sa) {
3044 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3045 clear_tx_sa(sa);
3046 }
3047 }
3048 }
3049
3050 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3051 {
3052 struct macsec_dev *macsec = macsec_priv(dev);
3053
3054 unregister_netdevice_queue(dev, head);
3055 list_del_rcu(&macsec->secys);
3056 macsec_del_dev(macsec);
3057
3058 macsec_generation++;
3059 }
3060
3061 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3062 {
3063 struct macsec_dev *macsec = macsec_priv(dev);
3064 struct net_device *real_dev = macsec->real_dev;
3065 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3066
3067 macsec_common_dellink(dev, head);
3068
3069 if (list_empty(&rxd->secys)) {
3070 netdev_rx_handler_unregister(real_dev);
3071 kfree(rxd);
3072 }
3073 }
3074
3075 static int register_macsec_dev(struct net_device *real_dev,
3076 struct net_device *dev)
3077 {
3078 struct macsec_dev *macsec = macsec_priv(dev);
3079 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3080
3081 if (!rxd) {
3082 int err;
3083
3084 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3085 if (!rxd)
3086 return -ENOMEM;
3087
3088 INIT_LIST_HEAD(&rxd->secys);
3089
3090 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3091 rxd);
3092 if (err < 0) {
3093 kfree(rxd);
3094 return err;
3095 }
3096 }
3097
3098 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3099 return 0;
3100 }
3101
3102 static bool sci_exists(struct net_device *dev, sci_t sci)
3103 {
3104 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3105 struct macsec_dev *macsec;
3106
3107 list_for_each_entry(macsec, &rxd->secys, secys) {
3108 if (macsec->secy.sci == sci)
3109 return true;
3110 }
3111
3112 return false;
3113 }
3114
3115 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3116 {
3117 return make_sci(dev->dev_addr, port);
3118 }
3119
3120 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3121 {
3122 struct macsec_dev *macsec = macsec_priv(dev);
3123 struct macsec_secy *secy = &macsec->secy;
3124
3125 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3126 if (!macsec->stats)
3127 return -ENOMEM;
3128
3129 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3130 if (!secy->tx_sc.stats) {
3131 free_percpu(macsec->stats);
3132 return -ENOMEM;
3133 }
3134
3135 if (sci == MACSEC_UNDEF_SCI)
3136 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3137
3138 secy->netdev = dev;
3139 secy->operational = true;
3140 secy->key_len = DEFAULT_SAK_LEN;
3141 secy->icv_len = icv_len;
3142 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3143 secy->protect_frames = true;
3144 secy->replay_protect = false;
3145
3146 secy->sci = sci;
3147 secy->tx_sc.active = true;
3148 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3149 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3150 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3151 secy->tx_sc.end_station = false;
3152 secy->tx_sc.scb = false;
3153
3154 return 0;
3155 }
3156
3157 static int macsec_newlink(struct net *net, struct net_device *dev,
3158 struct nlattr *tb[], struct nlattr *data[])
3159 {
3160 struct macsec_dev *macsec = macsec_priv(dev);
3161 struct net_device *real_dev;
3162 int err;
3163 sci_t sci;
3164 u8 icv_len = DEFAULT_ICV_LEN;
3165 rx_handler_func_t *rx_handler;
3166
3167 if (!tb[IFLA_LINK])
3168 return -EINVAL;
3169 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3170 if (!real_dev)
3171 return -ENODEV;
3172
3173 dev->priv_flags |= IFF_MACSEC;
3174
3175 macsec->real_dev = real_dev;
3176
3177 if (data && data[IFLA_MACSEC_ICV_LEN])
3178 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3179 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3180
3181 rx_handler = rtnl_dereference(real_dev->rx_handler);
3182 if (rx_handler && rx_handler != macsec_handle_frame)
3183 return -EBUSY;
3184
3185 err = register_netdevice(dev);
3186 if (err < 0)
3187 return err;
3188
3189 dev_hold(real_dev);
3190
3191 /* need to be already registered so that ->init has run and
3192 * the MAC addr is set
3193 */
3194 if (data && data[IFLA_MACSEC_SCI])
3195 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3196 else if (data && data[IFLA_MACSEC_PORT])
3197 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3198 else
3199 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3200
3201 if (rx_handler && sci_exists(real_dev, sci)) {
3202 err = -EBUSY;
3203 goto unregister;
3204 }
3205
3206 err = macsec_add_dev(dev, sci, icv_len);
3207 if (err)
3208 goto unregister;
3209
3210 if (data)
3211 macsec_changelink_common(dev, data);
3212
3213 err = register_macsec_dev(real_dev, dev);
3214 if (err < 0)
3215 goto del_dev;
3216
3217 macsec_generation++;
3218
3219 return 0;
3220
3221 del_dev:
3222 macsec_del_dev(macsec);
3223 unregister:
3224 unregister_netdevice(dev);
3225 return err;
3226 }
3227
3228 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
3229 {
3230 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3231 u8 icv_len = DEFAULT_ICV_LEN;
3232 int flag;
3233 bool es, scb, sci;
3234
3235 if (!data)
3236 return 0;
3237
3238 if (data[IFLA_MACSEC_CIPHER_SUITE])
3239 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3240
3241 if (data[IFLA_MACSEC_ICV_LEN]) {
3242 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3243 if (icv_len != DEFAULT_ICV_LEN) {
3244 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
3245 struct crypto_aead *dummy_tfm;
3246
3247 dummy_tfm = macsec_alloc_tfm(dummy_key,
3248 DEFAULT_SAK_LEN,
3249 icv_len);
3250 if (IS_ERR(dummy_tfm))
3251 return PTR_ERR(dummy_tfm);
3252 crypto_free_aead(dummy_tfm);
3253 }
3254 }
3255
3256 switch (csid) {
3257 case MACSEC_DEFAULT_CIPHER_ID:
3258 case MACSEC_DEFAULT_CIPHER_ALT:
3259 if (icv_len < MACSEC_MIN_ICV_LEN ||
3260 icv_len > MACSEC_STD_ICV_LEN)
3261 return -EINVAL;
3262 break;
3263 default:
3264 return -EINVAL;
3265 }
3266
3267 if (data[IFLA_MACSEC_ENCODING_SA]) {
3268 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3269 return -EINVAL;
3270 }
3271
3272 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3273 flag < IFLA_MACSEC_VALIDATION;
3274 flag++) {
3275 if (data[flag]) {
3276 if (nla_get_u8(data[flag]) > 1)
3277 return -EINVAL;
3278 }
3279 }
3280
3281 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3282 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3283 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3284
3285 if ((sci && (scb || es)) || (scb && es))
3286 return -EINVAL;
3287
3288 if (data[IFLA_MACSEC_VALIDATION] &&
3289 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3290 return -EINVAL;
3291
3292 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3293 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3294 !data[IFLA_MACSEC_WINDOW])
3295 return -EINVAL;
3296
3297 return 0;
3298 }
3299
3300 static struct net *macsec_get_link_net(const struct net_device *dev)
3301 {
3302 return dev_net(macsec_priv(dev)->real_dev);
3303 }
3304
3305 static size_t macsec_get_size(const struct net_device *dev)
3306 {
3307 return 0 +
3308 nla_total_size_64bit(8) + /* SCI */
3309 nla_total_size(1) + /* ICV_LEN */
3310 nla_total_size_64bit(8) + /* CIPHER_SUITE */
3311 nla_total_size(4) + /* WINDOW */
3312 nla_total_size(1) + /* ENCODING_SA */
3313 nla_total_size(1) + /* ENCRYPT */
3314 nla_total_size(1) + /* PROTECT */
3315 nla_total_size(1) + /* INC_SCI */
3316 nla_total_size(1) + /* ES */
3317 nla_total_size(1) + /* SCB */
3318 nla_total_size(1) + /* REPLAY_PROTECT */
3319 nla_total_size(1) + /* VALIDATION */
3320 0;
3321 }
3322
3323 static int macsec_fill_info(struct sk_buff *skb,
3324 const struct net_device *dev)
3325 {
3326 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3327 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3328
3329 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
3330 IFLA_MACSEC_PAD) ||
3331 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3332 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
3333 MACSEC_DEFAULT_CIPHER_ID, IFLA_MACSEC_PAD) ||
3334 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3335 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3336 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3337 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3338 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3339 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3340 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3341 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3342 0)
3343 goto nla_put_failure;
3344
3345 if (secy->replay_protect) {
3346 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3347 goto nla_put_failure;
3348 }
3349
3350 return 0;
3351
3352 nla_put_failure:
3353 return -EMSGSIZE;
3354 }
3355
3356 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3357 .kind = "macsec",
3358 .priv_size = sizeof(struct macsec_dev),
3359 .maxtype = IFLA_MACSEC_MAX,
3360 .policy = macsec_rtnl_policy,
3361 .setup = macsec_setup,
3362 .validate = macsec_validate_attr,
3363 .newlink = macsec_newlink,
3364 .changelink = macsec_changelink,
3365 .dellink = macsec_dellink,
3366 .get_size = macsec_get_size,
3367 .fill_info = macsec_fill_info,
3368 .get_link_net = macsec_get_link_net,
3369 };
3370
3371 static bool is_macsec_master(struct net_device *dev)
3372 {
3373 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3374 }
3375
3376 static int macsec_notify(struct notifier_block *this, unsigned long event,
3377 void *ptr)
3378 {
3379 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3380 LIST_HEAD(head);
3381
3382 if (!is_macsec_master(real_dev))
3383 return NOTIFY_DONE;
3384
3385 switch (event) {
3386 case NETDEV_UNREGISTER: {
3387 struct macsec_dev *m, *n;
3388 struct macsec_rxh_data *rxd;
3389
3390 rxd = macsec_data_rtnl(real_dev);
3391 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3392 macsec_common_dellink(m->secy.netdev, &head);
3393 }
3394
3395 netdev_rx_handler_unregister(real_dev);
3396 kfree(rxd);
3397
3398 unregister_netdevice_many(&head);
3399 break;
3400 }
3401 case NETDEV_CHANGEMTU: {
3402 struct macsec_dev *m;
3403 struct macsec_rxh_data *rxd;
3404
3405 rxd = macsec_data_rtnl(real_dev);
3406 list_for_each_entry(m, &rxd->secys, secys) {
3407 struct net_device *dev = m->secy.netdev;
3408 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3409 macsec_extra_len(true));
3410
3411 if (dev->mtu > mtu)
3412 dev_set_mtu(dev, mtu);
3413 }
3414 }
3415 }
3416
3417 return NOTIFY_OK;
3418 }
3419
3420 static struct notifier_block macsec_notifier = {
3421 .notifier_call = macsec_notify,
3422 };
3423
3424 static int __init macsec_init(void)
3425 {
3426 int err;
3427
3428 pr_info("MACsec IEEE 802.1AE\n");
3429 err = register_netdevice_notifier(&macsec_notifier);
3430 if (err)
3431 return err;
3432
3433 err = rtnl_link_register(&macsec_link_ops);
3434 if (err)
3435 goto notifier;
3436
3437 err = genl_register_family_with_ops(&macsec_fam, macsec_genl_ops);
3438 if (err)
3439 goto rtnl;
3440
3441 return 0;
3442
3443 rtnl:
3444 rtnl_link_unregister(&macsec_link_ops);
3445 notifier:
3446 unregister_netdevice_notifier(&macsec_notifier);
3447 return err;
3448 }
3449
3450 static void __exit macsec_exit(void)
3451 {
3452 genl_unregister_family(&macsec_fam);
3453 rtnl_link_unregister(&macsec_link_ops);
3454 unregister_netdevice_notifier(&macsec_notifier);
3455 rcu_barrier();
3456 }
3457
3458 module_init(macsec_init);
3459 module_exit(macsec_exit);
3460
3461 MODULE_ALIAS_RTNL_LINK("macsec");
3462
3463 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3464 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support