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[mirror_ubuntu-zesty-kernel.git] / drivers / net / macsec.c
1 /*
2 * drivers/net/macsec.c - MACsec device
3 *
4 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12 #include <linux/types.h>
13 #include <linux/skbuff.h>
14 #include <linux/socket.h>
15 #include <linux/module.h>
16 #include <crypto/aead.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rtnetlink.h>
19 #include <net/genetlink.h>
20 #include <net/sock.h>
21 #include <net/gro_cells.h>
22
23 #include <uapi/linux/if_macsec.h>
24
25 typedef u64 __bitwise sci_t;
26
27 #define MACSEC_SCI_LEN 8
28
29 /* SecTAG length = macsec_eth_header without the optional SCI */
30 #define MACSEC_TAG_LEN 6
31
32 struct macsec_eth_header {
33 struct ethhdr eth;
34 /* SecTAG */
35 u8 tci_an;
36 #if defined(__LITTLE_ENDIAN_BITFIELD)
37 u8 short_length:6,
38 unused:2;
39 #elif defined(__BIG_ENDIAN_BITFIELD)
40 u8 unused:2,
41 short_length:6;
42 #else
43 #error "Please fix <asm/byteorder.h>"
44 #endif
45 __be32 packet_number;
46 u8 secure_channel_id[8]; /* optional */
47 } __packed;
48
49 #define MACSEC_TCI_VERSION 0x80
50 #define MACSEC_TCI_ES 0x40 /* end station */
51 #define MACSEC_TCI_SC 0x20 /* SCI present */
52 #define MACSEC_TCI_SCB 0x10 /* epon */
53 #define MACSEC_TCI_E 0x08 /* encryption */
54 #define MACSEC_TCI_C 0x04 /* changed text */
55 #define MACSEC_AN_MASK 0x03 /* association number */
56 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
57
58 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
59 #define MIN_NON_SHORT_LEN 48
60
61 #define GCM_AES_IV_LEN 12
62 #define DEFAULT_ICV_LEN 16
63
64 #define MACSEC_NUM_AN 4 /* 2 bits for the association number */
65
66 #define for_each_rxsc(secy, sc) \
67 for (sc = rcu_dereference_bh(secy->rx_sc); \
68 sc; \
69 sc = rcu_dereference_bh(sc->next))
70 #define for_each_rxsc_rtnl(secy, sc) \
71 for (sc = rtnl_dereference(secy->rx_sc); \
72 sc; \
73 sc = rtnl_dereference(sc->next))
74
75 struct gcm_iv {
76 union {
77 u8 secure_channel_id[8];
78 sci_t sci;
79 };
80 __be32 pn;
81 };
82
83 /**
84 * struct macsec_key - SA key
85 * @id: user-provided key identifier
86 * @tfm: crypto struct, key storage
87 */
88 struct macsec_key {
89 u8 id[MACSEC_KEYID_LEN];
90 struct crypto_aead *tfm;
91 };
92
93 struct macsec_rx_sc_stats {
94 __u64 InOctetsValidated;
95 __u64 InOctetsDecrypted;
96 __u64 InPktsUnchecked;
97 __u64 InPktsDelayed;
98 __u64 InPktsOK;
99 __u64 InPktsInvalid;
100 __u64 InPktsLate;
101 __u64 InPktsNotValid;
102 __u64 InPktsNotUsingSA;
103 __u64 InPktsUnusedSA;
104 };
105
106 struct macsec_rx_sa_stats {
107 __u32 InPktsOK;
108 __u32 InPktsInvalid;
109 __u32 InPktsNotValid;
110 __u32 InPktsNotUsingSA;
111 __u32 InPktsUnusedSA;
112 };
113
114 struct macsec_tx_sa_stats {
115 __u32 OutPktsProtected;
116 __u32 OutPktsEncrypted;
117 };
118
119 struct macsec_tx_sc_stats {
120 __u64 OutPktsProtected;
121 __u64 OutPktsEncrypted;
122 __u64 OutOctetsProtected;
123 __u64 OutOctetsEncrypted;
124 };
125
126 struct macsec_dev_stats {
127 __u64 OutPktsUntagged;
128 __u64 InPktsUntagged;
129 __u64 OutPktsTooLong;
130 __u64 InPktsNoTag;
131 __u64 InPktsBadTag;
132 __u64 InPktsUnknownSCI;
133 __u64 InPktsNoSCI;
134 __u64 InPktsOverrun;
135 };
136
137 /**
138 * struct macsec_rx_sa - receive secure association
139 * @active:
140 * @next_pn: packet number expected for the next packet
141 * @lock: protects next_pn manipulations
142 * @key: key structure
143 * @stats: per-SA stats
144 */
145 struct macsec_rx_sa {
146 struct macsec_key key;
147 spinlock_t lock;
148 u32 next_pn;
149 atomic_t refcnt;
150 bool active;
151 struct macsec_rx_sa_stats __percpu *stats;
152 struct macsec_rx_sc *sc;
153 struct rcu_head rcu;
154 };
155
156 struct pcpu_rx_sc_stats {
157 struct macsec_rx_sc_stats stats;
158 struct u64_stats_sync syncp;
159 };
160
161 /**
162 * struct macsec_rx_sc - receive secure channel
163 * @sci: secure channel identifier for this SC
164 * @active: channel is active
165 * @sa: array of secure associations
166 * @stats: per-SC stats
167 */
168 struct macsec_rx_sc {
169 struct macsec_rx_sc __rcu *next;
170 sci_t sci;
171 bool active;
172 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN];
173 struct pcpu_rx_sc_stats __percpu *stats;
174 atomic_t refcnt;
175 struct rcu_head rcu_head;
176 };
177
178 /**
179 * struct macsec_tx_sa - transmit secure association
180 * @active:
181 * @next_pn: packet number to use for the next packet
182 * @lock: protects next_pn manipulations
183 * @key: key structure
184 * @stats: per-SA stats
185 */
186 struct macsec_tx_sa {
187 struct macsec_key key;
188 spinlock_t lock;
189 u32 next_pn;
190 atomic_t refcnt;
191 bool active;
192 struct macsec_tx_sa_stats __percpu *stats;
193 struct rcu_head rcu;
194 };
195
196 struct pcpu_tx_sc_stats {
197 struct macsec_tx_sc_stats stats;
198 struct u64_stats_sync syncp;
199 };
200
201 /**
202 * struct macsec_tx_sc - transmit secure channel
203 * @active:
204 * @encoding_sa: association number of the SA currently in use
205 * @encrypt: encrypt packets on transmit, or authenticate only
206 * @send_sci: always include the SCI in the SecTAG
207 * @end_station:
208 * @scb: single copy broadcast flag
209 * @sa: array of secure associations
210 * @stats: stats for this TXSC
211 */
212 struct macsec_tx_sc {
213 bool active;
214 u8 encoding_sa;
215 bool encrypt;
216 bool send_sci;
217 bool end_station;
218 bool scb;
219 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN];
220 struct pcpu_tx_sc_stats __percpu *stats;
221 };
222
223 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
224
225 /**
226 * struct macsec_secy - MACsec Security Entity
227 * @netdev: netdevice for this SecY
228 * @n_rx_sc: number of receive secure channels configured on this SecY
229 * @sci: secure channel identifier used for tx
230 * @key_len: length of keys used by the cipher suite
231 * @icv_len: length of ICV used by the cipher suite
232 * @validate_frames: validation mode
233 * @operational: MAC_Operational flag
234 * @protect_frames: enable protection for this SecY
235 * @replay_protect: enable packet number checks on receive
236 * @replay_window: size of the replay window
237 * @tx_sc: transmit secure channel
238 * @rx_sc: linked list of receive secure channels
239 */
240 struct macsec_secy {
241 struct net_device *netdev;
242 unsigned int n_rx_sc;
243 sci_t sci;
244 u16 key_len;
245 u16 icv_len;
246 enum macsec_validation_type validate_frames;
247 bool operational;
248 bool protect_frames;
249 bool replay_protect;
250 u32 replay_window;
251 struct macsec_tx_sc tx_sc;
252 struct macsec_rx_sc __rcu *rx_sc;
253 };
254
255 struct pcpu_secy_stats {
256 struct macsec_dev_stats stats;
257 struct u64_stats_sync syncp;
258 };
259
260 /**
261 * struct macsec_dev - private data
262 * @secy: SecY config
263 * @real_dev: pointer to underlying netdevice
264 * @stats: MACsec device stats
265 * @secys: linked list of SecY's on the underlying device
266 */
267 struct macsec_dev {
268 struct macsec_secy secy;
269 struct net_device *real_dev;
270 struct pcpu_secy_stats __percpu *stats;
271 struct list_head secys;
272 struct gro_cells gro_cells;
273 unsigned int nest_level;
274 };
275
276 /**
277 * struct macsec_rxh_data - rx_handler private argument
278 * @secys: linked list of SecY's on this underlying device
279 */
280 struct macsec_rxh_data {
281 struct list_head secys;
282 };
283
284 static struct macsec_dev *macsec_priv(const struct net_device *dev)
285 {
286 return (struct macsec_dev *)netdev_priv(dev);
287 }
288
289 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
290 {
291 return rcu_dereference_bh(dev->rx_handler_data);
292 }
293
294 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
295 {
296 return rtnl_dereference(dev->rx_handler_data);
297 }
298
299 struct macsec_cb {
300 struct aead_request *req;
301 union {
302 struct macsec_tx_sa *tx_sa;
303 struct macsec_rx_sa *rx_sa;
304 };
305 u8 assoc_num;
306 bool valid;
307 bool has_sci;
308 };
309
310 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
311 {
312 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
313
314 if (!sa || !sa->active)
315 return NULL;
316
317 if (!atomic_inc_not_zero(&sa->refcnt))
318 return NULL;
319
320 return sa;
321 }
322
323 static void free_rx_sc_rcu(struct rcu_head *head)
324 {
325 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
326
327 free_percpu(rx_sc->stats);
328 kfree(rx_sc);
329 }
330
331 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
332 {
333 return atomic_inc_not_zero(&sc->refcnt) ? sc : NULL;
334 }
335
336 static void macsec_rxsc_put(struct macsec_rx_sc *sc)
337 {
338 if (atomic_dec_and_test(&sc->refcnt))
339 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
340 }
341
342 static void free_rxsa(struct rcu_head *head)
343 {
344 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
345
346 crypto_free_aead(sa->key.tfm);
347 free_percpu(sa->stats);
348 kfree(sa);
349 }
350
351 static void macsec_rxsa_put(struct macsec_rx_sa *sa)
352 {
353 if (atomic_dec_and_test(&sa->refcnt))
354 call_rcu(&sa->rcu, free_rxsa);
355 }
356
357 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
358 {
359 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
360
361 if (!sa || !sa->active)
362 return NULL;
363
364 if (!atomic_inc_not_zero(&sa->refcnt))
365 return NULL;
366
367 return sa;
368 }
369
370 static void free_txsa(struct rcu_head *head)
371 {
372 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
373
374 crypto_free_aead(sa->key.tfm);
375 free_percpu(sa->stats);
376 kfree(sa);
377 }
378
379 static void macsec_txsa_put(struct macsec_tx_sa *sa)
380 {
381 if (atomic_dec_and_test(&sa->refcnt))
382 call_rcu(&sa->rcu, free_txsa);
383 }
384
385 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
386 {
387 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
388 return (struct macsec_cb *)skb->cb;
389 }
390
391 #define MACSEC_PORT_ES (htons(0x0001))
392 #define MACSEC_PORT_SCB (0x0000)
393 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
394
395 #define DEFAULT_SAK_LEN 16
396 #define DEFAULT_SEND_SCI true
397 #define DEFAULT_ENCRYPT false
398 #define DEFAULT_ENCODING_SA 0
399
400 static bool send_sci(const struct macsec_secy *secy)
401 {
402 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
403
404 return tx_sc->send_sci ||
405 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
406 }
407
408 static sci_t make_sci(u8 *addr, __be16 port)
409 {
410 sci_t sci;
411
412 memcpy(&sci, addr, ETH_ALEN);
413 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
414
415 return sci;
416 }
417
418 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
419 {
420 sci_t sci;
421
422 if (sci_present)
423 memcpy(&sci, hdr->secure_channel_id,
424 sizeof(hdr->secure_channel_id));
425 else
426 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
427
428 return sci;
429 }
430
431 static unsigned int macsec_sectag_len(bool sci_present)
432 {
433 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
434 }
435
436 static unsigned int macsec_hdr_len(bool sci_present)
437 {
438 return macsec_sectag_len(sci_present) + ETH_HLEN;
439 }
440
441 static unsigned int macsec_extra_len(bool sci_present)
442 {
443 return macsec_sectag_len(sci_present) + sizeof(__be16);
444 }
445
446 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
447 static void macsec_fill_sectag(struct macsec_eth_header *h,
448 const struct macsec_secy *secy, u32 pn,
449 bool sci_present)
450 {
451 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
452
453 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
454 h->eth.h_proto = htons(ETH_P_MACSEC);
455
456 if (sci_present) {
457 h->tci_an |= MACSEC_TCI_SC;
458 memcpy(&h->secure_channel_id, &secy->sci,
459 sizeof(h->secure_channel_id));
460 } else {
461 if (tx_sc->end_station)
462 h->tci_an |= MACSEC_TCI_ES;
463 if (tx_sc->scb)
464 h->tci_an |= MACSEC_TCI_SCB;
465 }
466
467 h->packet_number = htonl(pn);
468
469 /* with GCM, C/E clear for !encrypt, both set for encrypt */
470 if (tx_sc->encrypt)
471 h->tci_an |= MACSEC_TCI_CONFID;
472 else if (secy->icv_len != DEFAULT_ICV_LEN)
473 h->tci_an |= MACSEC_TCI_C;
474
475 h->tci_an |= tx_sc->encoding_sa;
476 }
477
478 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
479 {
480 if (data_len < MIN_NON_SHORT_LEN)
481 h->short_length = data_len;
482 }
483
484 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
485 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
486 {
487 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
488 int len = skb->len - 2 * ETH_ALEN;
489 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
490
491 /* a) It comprises at least 17 octets */
492 if (skb->len <= 16)
493 return false;
494
495 /* b) MACsec EtherType: already checked */
496
497 /* c) V bit is clear */
498 if (h->tci_an & MACSEC_TCI_VERSION)
499 return false;
500
501 /* d) ES or SCB => !SC */
502 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
503 (h->tci_an & MACSEC_TCI_SC))
504 return false;
505
506 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
507 if (h->unused)
508 return false;
509
510 /* rx.pn != 0 (figure 10-5) */
511 if (!h->packet_number)
512 return false;
513
514 /* length check, f) g) h) i) */
515 if (h->short_length)
516 return len == extra_len + h->short_length;
517 return len >= extra_len + MIN_NON_SHORT_LEN;
518 }
519
520 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
521 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
522
523 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
524 {
525 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
526
527 gcm_iv->sci = sci;
528 gcm_iv->pn = htonl(pn);
529 }
530
531 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
532 {
533 return (struct macsec_eth_header *)skb_mac_header(skb);
534 }
535
536 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
537 {
538 u32 pn;
539
540 spin_lock_bh(&tx_sa->lock);
541 pn = tx_sa->next_pn;
542
543 tx_sa->next_pn++;
544 if (tx_sa->next_pn == 0) {
545 pr_debug("PN wrapped, transitioning to !oper\n");
546 tx_sa->active = false;
547 if (secy->protect_frames)
548 secy->operational = false;
549 }
550 spin_unlock_bh(&tx_sa->lock);
551
552 return pn;
553 }
554
555 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
556 {
557 struct macsec_dev *macsec = netdev_priv(dev);
558
559 skb->dev = macsec->real_dev;
560 skb_reset_mac_header(skb);
561 skb->protocol = eth_hdr(skb)->h_proto;
562 }
563
564 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
565 struct macsec_tx_sa *tx_sa)
566 {
567 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
568
569 u64_stats_update_begin(&txsc_stats->syncp);
570 if (tx_sc->encrypt) {
571 txsc_stats->stats.OutOctetsEncrypted += skb->len;
572 txsc_stats->stats.OutPktsEncrypted++;
573 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
574 } else {
575 txsc_stats->stats.OutOctetsProtected += skb->len;
576 txsc_stats->stats.OutPktsProtected++;
577 this_cpu_inc(tx_sa->stats->OutPktsProtected);
578 }
579 u64_stats_update_end(&txsc_stats->syncp);
580 }
581
582 static void count_tx(struct net_device *dev, int ret, int len)
583 {
584 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
585 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
586
587 u64_stats_update_begin(&stats->syncp);
588 stats->tx_packets++;
589 stats->tx_bytes += len;
590 u64_stats_update_end(&stats->syncp);
591 } else {
592 dev->stats.tx_dropped++;
593 }
594 }
595
596 static void macsec_encrypt_done(struct crypto_async_request *base, int err)
597 {
598 struct sk_buff *skb = base->data;
599 struct net_device *dev = skb->dev;
600 struct macsec_dev *macsec = macsec_priv(dev);
601 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
602 int len, ret;
603
604 aead_request_free(macsec_skb_cb(skb)->req);
605
606 rcu_read_lock_bh();
607 macsec_encrypt_finish(skb, dev);
608 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
609 len = skb->len;
610 ret = dev_queue_xmit(skb);
611 count_tx(dev, ret, len);
612 rcu_read_unlock_bh();
613
614 macsec_txsa_put(sa);
615 dev_put(dev);
616 }
617
618 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
619 unsigned char **iv,
620 struct scatterlist **sg,
621 int num_frags)
622 {
623 size_t size, iv_offset, sg_offset;
624 struct aead_request *req;
625 void *tmp;
626
627 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
628 iv_offset = size;
629 size += GCM_AES_IV_LEN;
630
631 size = ALIGN(size, __alignof__(struct scatterlist));
632 sg_offset = size;
633 size += sizeof(struct scatterlist) * num_frags;
634
635 tmp = kmalloc(size, GFP_ATOMIC);
636 if (!tmp)
637 return NULL;
638
639 *iv = (unsigned char *)(tmp + iv_offset);
640 *sg = (struct scatterlist *)(tmp + sg_offset);
641 req = tmp;
642
643 aead_request_set_tfm(req, tfm);
644
645 return req;
646 }
647
648 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
649 struct net_device *dev)
650 {
651 int ret;
652 struct scatterlist *sg;
653 struct sk_buff *trailer;
654 unsigned char *iv;
655 struct ethhdr *eth;
656 struct macsec_eth_header *hh;
657 size_t unprotected_len;
658 struct aead_request *req;
659 struct macsec_secy *secy;
660 struct macsec_tx_sc *tx_sc;
661 struct macsec_tx_sa *tx_sa;
662 struct macsec_dev *macsec = macsec_priv(dev);
663 bool sci_present;
664 u32 pn;
665
666 secy = &macsec->secy;
667 tx_sc = &secy->tx_sc;
668
669 /* 10.5.1 TX SA assignment */
670 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
671 if (!tx_sa) {
672 secy->operational = false;
673 kfree_skb(skb);
674 return ERR_PTR(-EINVAL);
675 }
676
677 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
678 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
679 struct sk_buff *nskb = skb_copy_expand(skb,
680 MACSEC_NEEDED_HEADROOM,
681 MACSEC_NEEDED_TAILROOM,
682 GFP_ATOMIC);
683 if (likely(nskb)) {
684 consume_skb(skb);
685 skb = nskb;
686 } else {
687 macsec_txsa_put(tx_sa);
688 kfree_skb(skb);
689 return ERR_PTR(-ENOMEM);
690 }
691 } else {
692 skb = skb_unshare(skb, GFP_ATOMIC);
693 if (!skb) {
694 macsec_txsa_put(tx_sa);
695 return ERR_PTR(-ENOMEM);
696 }
697 }
698
699 unprotected_len = skb->len;
700 eth = eth_hdr(skb);
701 sci_present = send_sci(secy);
702 hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(sci_present));
703 memmove(hh, eth, 2 * ETH_ALEN);
704
705 pn = tx_sa_update_pn(tx_sa, secy);
706 if (pn == 0) {
707 macsec_txsa_put(tx_sa);
708 kfree_skb(skb);
709 return ERR_PTR(-ENOLINK);
710 }
711 macsec_fill_sectag(hh, secy, pn, sci_present);
712 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
713
714 skb_put(skb, secy->icv_len);
715
716 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
717 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
718
719 u64_stats_update_begin(&secy_stats->syncp);
720 secy_stats->stats.OutPktsTooLong++;
721 u64_stats_update_end(&secy_stats->syncp);
722
723 macsec_txsa_put(tx_sa);
724 kfree_skb(skb);
725 return ERR_PTR(-EINVAL);
726 }
727
728 ret = skb_cow_data(skb, 0, &trailer);
729 if (unlikely(ret < 0)) {
730 macsec_txsa_put(tx_sa);
731 kfree_skb(skb);
732 return ERR_PTR(ret);
733 }
734
735 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
736 if (!req) {
737 macsec_txsa_put(tx_sa);
738 kfree_skb(skb);
739 return ERR_PTR(-ENOMEM);
740 }
741
742 macsec_fill_iv(iv, secy->sci, pn);
743
744 sg_init_table(sg, ret);
745 skb_to_sgvec(skb, sg, 0, skb->len);
746
747 if (tx_sc->encrypt) {
748 int len = skb->len - macsec_hdr_len(sci_present) -
749 secy->icv_len;
750 aead_request_set_crypt(req, sg, sg, len, iv);
751 aead_request_set_ad(req, macsec_hdr_len(sci_present));
752 } else {
753 aead_request_set_crypt(req, sg, sg, 0, iv);
754 aead_request_set_ad(req, skb->len - secy->icv_len);
755 }
756
757 macsec_skb_cb(skb)->req = req;
758 macsec_skb_cb(skb)->tx_sa = tx_sa;
759 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
760
761 dev_hold(skb->dev);
762 ret = crypto_aead_encrypt(req);
763 if (ret == -EINPROGRESS) {
764 return ERR_PTR(ret);
765 } else if (ret != 0) {
766 dev_put(skb->dev);
767 kfree_skb(skb);
768 aead_request_free(req);
769 macsec_txsa_put(tx_sa);
770 return ERR_PTR(-EINVAL);
771 }
772
773 dev_put(skb->dev);
774 aead_request_free(req);
775 macsec_txsa_put(tx_sa);
776
777 return skb;
778 }
779
780 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
781 {
782 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
783 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
784 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
785 u32 lowest_pn = 0;
786
787 spin_lock(&rx_sa->lock);
788 if (rx_sa->next_pn >= secy->replay_window)
789 lowest_pn = rx_sa->next_pn - secy->replay_window;
790
791 /* Now perform replay protection check again
792 * (see IEEE 802.1AE-2006 figure 10-5)
793 */
794 if (secy->replay_protect && pn < lowest_pn) {
795 spin_unlock(&rx_sa->lock);
796 u64_stats_update_begin(&rxsc_stats->syncp);
797 rxsc_stats->stats.InPktsLate++;
798 u64_stats_update_end(&rxsc_stats->syncp);
799 return false;
800 }
801
802 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
803 u64_stats_update_begin(&rxsc_stats->syncp);
804 if (hdr->tci_an & MACSEC_TCI_E)
805 rxsc_stats->stats.InOctetsDecrypted += skb->len;
806 else
807 rxsc_stats->stats.InOctetsValidated += skb->len;
808 u64_stats_update_end(&rxsc_stats->syncp);
809 }
810
811 if (!macsec_skb_cb(skb)->valid) {
812 spin_unlock(&rx_sa->lock);
813
814 /* 10.6.5 */
815 if (hdr->tci_an & MACSEC_TCI_C ||
816 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
817 u64_stats_update_begin(&rxsc_stats->syncp);
818 rxsc_stats->stats.InPktsNotValid++;
819 u64_stats_update_end(&rxsc_stats->syncp);
820 return false;
821 }
822
823 u64_stats_update_begin(&rxsc_stats->syncp);
824 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
825 rxsc_stats->stats.InPktsInvalid++;
826 this_cpu_inc(rx_sa->stats->InPktsInvalid);
827 } else if (pn < lowest_pn) {
828 rxsc_stats->stats.InPktsDelayed++;
829 } else {
830 rxsc_stats->stats.InPktsUnchecked++;
831 }
832 u64_stats_update_end(&rxsc_stats->syncp);
833 } else {
834 u64_stats_update_begin(&rxsc_stats->syncp);
835 if (pn < lowest_pn) {
836 rxsc_stats->stats.InPktsDelayed++;
837 } else {
838 rxsc_stats->stats.InPktsOK++;
839 this_cpu_inc(rx_sa->stats->InPktsOK);
840 }
841 u64_stats_update_end(&rxsc_stats->syncp);
842
843 if (pn >= rx_sa->next_pn)
844 rx_sa->next_pn = pn + 1;
845 spin_unlock(&rx_sa->lock);
846 }
847
848 return true;
849 }
850
851 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
852 {
853 skb->pkt_type = PACKET_HOST;
854 skb->protocol = eth_type_trans(skb, dev);
855
856 skb_reset_network_header(skb);
857 if (!skb_transport_header_was_set(skb))
858 skb_reset_transport_header(skb);
859 skb_reset_mac_len(skb);
860 }
861
862 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
863 {
864 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
865 skb_pull(skb, hdr_len);
866 pskb_trim_unique(skb, skb->len - icv_len);
867 }
868
869 static void count_rx(struct net_device *dev, int len)
870 {
871 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
872
873 u64_stats_update_begin(&stats->syncp);
874 stats->rx_packets++;
875 stats->rx_bytes += len;
876 u64_stats_update_end(&stats->syncp);
877 }
878
879 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
880 {
881 struct sk_buff *skb = base->data;
882 struct net_device *dev = skb->dev;
883 struct macsec_dev *macsec = macsec_priv(dev);
884 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
885 struct macsec_rx_sc *rx_sc = rx_sa->sc;
886 int len, ret;
887 u32 pn;
888
889 aead_request_free(macsec_skb_cb(skb)->req);
890
891 rcu_read_lock_bh();
892 pn = ntohl(macsec_ethhdr(skb)->packet_number);
893 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
894 rcu_read_unlock_bh();
895 kfree_skb(skb);
896 goto out;
897 }
898
899 macsec_finalize_skb(skb, macsec->secy.icv_len,
900 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
901 macsec_reset_skb(skb, macsec->secy.netdev);
902
903 len = skb->len;
904 ret = gro_cells_receive(&macsec->gro_cells, skb);
905 if (ret == NET_RX_SUCCESS)
906 count_rx(dev, len);
907 else
908 macsec->secy.netdev->stats.rx_dropped++;
909
910 rcu_read_unlock_bh();
911
912 out:
913 macsec_rxsa_put(rx_sa);
914 macsec_rxsc_put(rx_sc);
915 dev_put(dev);
916 }
917
918 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
919 struct net_device *dev,
920 struct macsec_rx_sa *rx_sa,
921 sci_t sci,
922 struct macsec_secy *secy)
923 {
924 int ret;
925 struct scatterlist *sg;
926 struct sk_buff *trailer;
927 unsigned char *iv;
928 struct aead_request *req;
929 struct macsec_eth_header *hdr;
930 u16 icv_len = secy->icv_len;
931
932 macsec_skb_cb(skb)->valid = false;
933 skb = skb_share_check(skb, GFP_ATOMIC);
934 if (!skb)
935 return ERR_PTR(-ENOMEM);
936
937 ret = skb_cow_data(skb, 0, &trailer);
938 if (unlikely(ret < 0)) {
939 kfree_skb(skb);
940 return ERR_PTR(ret);
941 }
942 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
943 if (!req) {
944 kfree_skb(skb);
945 return ERR_PTR(-ENOMEM);
946 }
947
948 hdr = (struct macsec_eth_header *)skb->data;
949 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
950
951 sg_init_table(sg, ret);
952 skb_to_sgvec(skb, sg, 0, skb->len);
953
954 if (hdr->tci_an & MACSEC_TCI_E) {
955 /* confidentiality: ethernet + macsec header
956 * authenticated, encrypted payload
957 */
958 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
959
960 aead_request_set_crypt(req, sg, sg, len, iv);
961 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
962 skb = skb_unshare(skb, GFP_ATOMIC);
963 if (!skb) {
964 aead_request_free(req);
965 return ERR_PTR(-ENOMEM);
966 }
967 } else {
968 /* integrity only: all headers + data authenticated */
969 aead_request_set_crypt(req, sg, sg, icv_len, iv);
970 aead_request_set_ad(req, skb->len - icv_len);
971 }
972
973 macsec_skb_cb(skb)->req = req;
974 skb->dev = dev;
975 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
976
977 dev_hold(dev);
978 ret = crypto_aead_decrypt(req);
979 if (ret == -EINPROGRESS) {
980 return ERR_PTR(ret);
981 } else if (ret != 0) {
982 /* decryption/authentication failed
983 * 10.6 if validateFrames is disabled, deliver anyway
984 */
985 if (ret != -EBADMSG) {
986 kfree_skb(skb);
987 skb = ERR_PTR(ret);
988 }
989 } else {
990 macsec_skb_cb(skb)->valid = true;
991 }
992 dev_put(dev);
993
994 aead_request_free(req);
995
996 return skb;
997 }
998
999 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
1000 {
1001 struct macsec_rx_sc *rx_sc;
1002
1003 for_each_rxsc(secy, rx_sc) {
1004 if (rx_sc->sci == sci)
1005 return rx_sc;
1006 }
1007
1008 return NULL;
1009 }
1010
1011 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
1012 {
1013 struct macsec_rx_sc *rx_sc;
1014
1015 for_each_rxsc_rtnl(secy, rx_sc) {
1016 if (rx_sc->sci == sci)
1017 return rx_sc;
1018 }
1019
1020 return NULL;
1021 }
1022
1023 static void handle_not_macsec(struct sk_buff *skb)
1024 {
1025 struct macsec_rxh_data *rxd;
1026 struct macsec_dev *macsec;
1027
1028 rcu_read_lock();
1029 rxd = macsec_data_rcu(skb->dev);
1030
1031 /* 10.6 If the management control validateFrames is not
1032 * Strict, frames without a SecTAG are received, counted, and
1033 * delivered to the Controlled Port
1034 */
1035 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1036 struct sk_buff *nskb;
1037 int ret;
1038 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1039
1040 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1041 u64_stats_update_begin(&secy_stats->syncp);
1042 secy_stats->stats.InPktsNoTag++;
1043 u64_stats_update_end(&secy_stats->syncp);
1044 continue;
1045 }
1046
1047 /* deliver on this port */
1048 nskb = skb_clone(skb, GFP_ATOMIC);
1049 if (!nskb)
1050 break;
1051
1052 nskb->dev = macsec->secy.netdev;
1053
1054 ret = netif_rx(nskb);
1055 if (ret == NET_RX_SUCCESS) {
1056 u64_stats_update_begin(&secy_stats->syncp);
1057 secy_stats->stats.InPktsUntagged++;
1058 u64_stats_update_end(&secy_stats->syncp);
1059 } else {
1060 macsec->secy.netdev->stats.rx_dropped++;
1061 }
1062 }
1063
1064 rcu_read_unlock();
1065 }
1066
1067 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1068 {
1069 struct sk_buff *skb = *pskb;
1070 struct net_device *dev = skb->dev;
1071 struct macsec_eth_header *hdr;
1072 struct macsec_secy *secy = NULL;
1073 struct macsec_rx_sc *rx_sc;
1074 struct macsec_rx_sa *rx_sa;
1075 struct macsec_rxh_data *rxd;
1076 struct macsec_dev *macsec;
1077 sci_t sci;
1078 u32 pn;
1079 bool cbit;
1080 struct pcpu_rx_sc_stats *rxsc_stats;
1081 struct pcpu_secy_stats *secy_stats;
1082 bool pulled_sci;
1083 int ret;
1084
1085 if (skb_headroom(skb) < ETH_HLEN)
1086 goto drop_direct;
1087
1088 hdr = macsec_ethhdr(skb);
1089 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1090 handle_not_macsec(skb);
1091
1092 /* and deliver to the uncontrolled port */
1093 return RX_HANDLER_PASS;
1094 }
1095
1096 skb = skb_unshare(skb, GFP_ATOMIC);
1097 if (!skb) {
1098 *pskb = NULL;
1099 return RX_HANDLER_CONSUMED;
1100 }
1101
1102 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1103 if (!pulled_sci) {
1104 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1105 goto drop_direct;
1106 }
1107
1108 hdr = macsec_ethhdr(skb);
1109
1110 /* Frames with a SecTAG that has the TCI E bit set but the C
1111 * bit clear are discarded, as this reserved encoding is used
1112 * to identify frames with a SecTAG that are not to be
1113 * delivered to the Controlled Port.
1114 */
1115 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1116 return RX_HANDLER_PASS;
1117
1118 /* now, pull the extra length */
1119 if (hdr->tci_an & MACSEC_TCI_SC) {
1120 if (!pulled_sci)
1121 goto drop_direct;
1122 }
1123
1124 /* ethernet header is part of crypto processing */
1125 skb_push(skb, ETH_HLEN);
1126
1127 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1128 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1129 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1130
1131 rcu_read_lock();
1132 rxd = macsec_data_rcu(skb->dev);
1133
1134 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1135 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1136 sc = sc ? macsec_rxsc_get(sc) : NULL;
1137
1138 if (sc) {
1139 secy = &macsec->secy;
1140 rx_sc = sc;
1141 break;
1142 }
1143 }
1144
1145 if (!secy)
1146 goto nosci;
1147
1148 dev = secy->netdev;
1149 macsec = macsec_priv(dev);
1150 secy_stats = this_cpu_ptr(macsec->stats);
1151 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1152
1153 if (!macsec_validate_skb(skb, secy->icv_len)) {
1154 u64_stats_update_begin(&secy_stats->syncp);
1155 secy_stats->stats.InPktsBadTag++;
1156 u64_stats_update_end(&secy_stats->syncp);
1157 goto drop_nosa;
1158 }
1159
1160 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1161 if (!rx_sa) {
1162 /* 10.6.1 if the SA is not in use */
1163
1164 /* If validateFrames is Strict or the C bit in the
1165 * SecTAG is set, discard
1166 */
1167 if (hdr->tci_an & MACSEC_TCI_C ||
1168 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1169 u64_stats_update_begin(&rxsc_stats->syncp);
1170 rxsc_stats->stats.InPktsNotUsingSA++;
1171 u64_stats_update_end(&rxsc_stats->syncp);
1172 goto drop_nosa;
1173 }
1174
1175 /* not Strict, the frame (with the SecTAG and ICV
1176 * removed) is delivered to the Controlled Port.
1177 */
1178 u64_stats_update_begin(&rxsc_stats->syncp);
1179 rxsc_stats->stats.InPktsUnusedSA++;
1180 u64_stats_update_end(&rxsc_stats->syncp);
1181 goto deliver;
1182 }
1183
1184 /* First, PN check to avoid decrypting obviously wrong packets */
1185 pn = ntohl(hdr->packet_number);
1186 if (secy->replay_protect) {
1187 bool late;
1188
1189 spin_lock(&rx_sa->lock);
1190 late = rx_sa->next_pn >= secy->replay_window &&
1191 pn < (rx_sa->next_pn - secy->replay_window);
1192 spin_unlock(&rx_sa->lock);
1193
1194 if (late) {
1195 u64_stats_update_begin(&rxsc_stats->syncp);
1196 rxsc_stats->stats.InPktsLate++;
1197 u64_stats_update_end(&rxsc_stats->syncp);
1198 goto drop;
1199 }
1200 }
1201
1202 macsec_skb_cb(skb)->rx_sa = rx_sa;
1203
1204 /* Disabled && !changed text => skip validation */
1205 if (hdr->tci_an & MACSEC_TCI_C ||
1206 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1207 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1208
1209 if (IS_ERR(skb)) {
1210 /* the decrypt callback needs the reference */
1211 if (PTR_ERR(skb) != -EINPROGRESS) {
1212 macsec_rxsa_put(rx_sa);
1213 macsec_rxsc_put(rx_sc);
1214 }
1215 rcu_read_unlock();
1216 *pskb = NULL;
1217 return RX_HANDLER_CONSUMED;
1218 }
1219
1220 if (!macsec_post_decrypt(skb, secy, pn))
1221 goto drop;
1222
1223 deliver:
1224 macsec_finalize_skb(skb, secy->icv_len,
1225 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1226 macsec_reset_skb(skb, secy->netdev);
1227
1228 if (rx_sa)
1229 macsec_rxsa_put(rx_sa);
1230 macsec_rxsc_put(rx_sc);
1231
1232 ret = gro_cells_receive(&macsec->gro_cells, skb);
1233 if (ret == NET_RX_SUCCESS)
1234 count_rx(dev, skb->len);
1235 else
1236 macsec->secy.netdev->stats.rx_dropped++;
1237
1238 rcu_read_unlock();
1239
1240 *pskb = NULL;
1241 return RX_HANDLER_CONSUMED;
1242
1243 drop:
1244 macsec_rxsa_put(rx_sa);
1245 drop_nosa:
1246 macsec_rxsc_put(rx_sc);
1247 rcu_read_unlock();
1248 drop_direct:
1249 kfree_skb(skb);
1250 *pskb = NULL;
1251 return RX_HANDLER_CONSUMED;
1252
1253 nosci:
1254 /* 10.6.1 if the SC is not found */
1255 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1256 if (!cbit)
1257 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1258 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1259
1260 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1261 struct sk_buff *nskb;
1262
1263 secy_stats = this_cpu_ptr(macsec->stats);
1264
1265 /* If validateFrames is Strict or the C bit in the
1266 * SecTAG is set, discard
1267 */
1268 if (cbit ||
1269 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1270 u64_stats_update_begin(&secy_stats->syncp);
1271 secy_stats->stats.InPktsNoSCI++;
1272 u64_stats_update_end(&secy_stats->syncp);
1273 continue;
1274 }
1275
1276 /* not strict, the frame (with the SecTAG and ICV
1277 * removed) is delivered to the Controlled Port.
1278 */
1279 nskb = skb_clone(skb, GFP_ATOMIC);
1280 if (!nskb)
1281 break;
1282
1283 macsec_reset_skb(nskb, macsec->secy.netdev);
1284
1285 ret = netif_rx(nskb);
1286 if (ret == NET_RX_SUCCESS) {
1287 u64_stats_update_begin(&secy_stats->syncp);
1288 secy_stats->stats.InPktsUnknownSCI++;
1289 u64_stats_update_end(&secy_stats->syncp);
1290 } else {
1291 macsec->secy.netdev->stats.rx_dropped++;
1292 }
1293 }
1294
1295 rcu_read_unlock();
1296 *pskb = skb;
1297 return RX_HANDLER_PASS;
1298 }
1299
1300 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1301 {
1302 struct crypto_aead *tfm;
1303 int ret;
1304
1305 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1306
1307 if (IS_ERR(tfm))
1308 return tfm;
1309
1310 ret = crypto_aead_setkey(tfm, key, key_len);
1311 if (ret < 0)
1312 goto fail;
1313
1314 ret = crypto_aead_setauthsize(tfm, icv_len);
1315 if (ret < 0)
1316 goto fail;
1317
1318 return tfm;
1319 fail:
1320 crypto_free_aead(tfm);
1321 return ERR_PTR(ret);
1322 }
1323
1324 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1325 int icv_len)
1326 {
1327 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1328 if (!rx_sa->stats)
1329 return -ENOMEM;
1330
1331 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1332 if (IS_ERR(rx_sa->key.tfm)) {
1333 free_percpu(rx_sa->stats);
1334 return PTR_ERR(rx_sa->key.tfm);
1335 }
1336
1337 rx_sa->active = false;
1338 rx_sa->next_pn = 1;
1339 atomic_set(&rx_sa->refcnt, 1);
1340 spin_lock_init(&rx_sa->lock);
1341
1342 return 0;
1343 }
1344
1345 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1346 {
1347 rx_sa->active = false;
1348
1349 macsec_rxsa_put(rx_sa);
1350 }
1351
1352 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1353 {
1354 int i;
1355
1356 for (i = 0; i < MACSEC_NUM_AN; i++) {
1357 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1358
1359 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1360 if (sa)
1361 clear_rx_sa(sa);
1362 }
1363
1364 macsec_rxsc_put(rx_sc);
1365 }
1366
1367 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1368 {
1369 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1370
1371 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1372 rx_sc;
1373 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1374 if (rx_sc->sci == sci) {
1375 if (rx_sc->active)
1376 secy->n_rx_sc--;
1377 rcu_assign_pointer(*rx_scp, rx_sc->next);
1378 return rx_sc;
1379 }
1380 }
1381
1382 return NULL;
1383 }
1384
1385 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1386 {
1387 struct macsec_rx_sc *rx_sc;
1388 struct macsec_dev *macsec;
1389 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1390 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1391 struct macsec_secy *secy;
1392
1393 list_for_each_entry(macsec, &rxd->secys, secys) {
1394 if (find_rx_sc_rtnl(&macsec->secy, sci))
1395 return ERR_PTR(-EEXIST);
1396 }
1397
1398 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1399 if (!rx_sc)
1400 return ERR_PTR(-ENOMEM);
1401
1402 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1403 if (!rx_sc->stats) {
1404 kfree(rx_sc);
1405 return ERR_PTR(-ENOMEM);
1406 }
1407
1408 rx_sc->sci = sci;
1409 rx_sc->active = true;
1410 atomic_set(&rx_sc->refcnt, 1);
1411
1412 secy = &macsec_priv(dev)->secy;
1413 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1414 rcu_assign_pointer(secy->rx_sc, rx_sc);
1415
1416 if (rx_sc->active)
1417 secy->n_rx_sc++;
1418
1419 return rx_sc;
1420 }
1421
1422 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1423 int icv_len)
1424 {
1425 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1426 if (!tx_sa->stats)
1427 return -ENOMEM;
1428
1429 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1430 if (IS_ERR(tx_sa->key.tfm)) {
1431 free_percpu(tx_sa->stats);
1432 return PTR_ERR(tx_sa->key.tfm);
1433 }
1434
1435 tx_sa->active = false;
1436 atomic_set(&tx_sa->refcnt, 1);
1437 spin_lock_init(&tx_sa->lock);
1438
1439 return 0;
1440 }
1441
1442 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1443 {
1444 tx_sa->active = false;
1445
1446 macsec_txsa_put(tx_sa);
1447 }
1448
1449 static struct genl_family macsec_fam;
1450
1451 static struct net_device *get_dev_from_nl(struct net *net,
1452 struct nlattr **attrs)
1453 {
1454 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1455 struct net_device *dev;
1456
1457 dev = __dev_get_by_index(net, ifindex);
1458 if (!dev)
1459 return ERR_PTR(-ENODEV);
1460
1461 if (!netif_is_macsec(dev))
1462 return ERR_PTR(-ENODEV);
1463
1464 return dev;
1465 }
1466
1467 static sci_t nla_get_sci(const struct nlattr *nla)
1468 {
1469 return (__force sci_t)nla_get_u64(nla);
1470 }
1471
1472 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1473 int padattr)
1474 {
1475 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1476 }
1477
1478 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1479 struct nlattr **attrs,
1480 struct nlattr **tb_sa,
1481 struct net_device **devp,
1482 struct macsec_secy **secyp,
1483 struct macsec_tx_sc **scp,
1484 u8 *assoc_num)
1485 {
1486 struct net_device *dev;
1487 struct macsec_secy *secy;
1488 struct macsec_tx_sc *tx_sc;
1489 struct macsec_tx_sa *tx_sa;
1490
1491 if (!tb_sa[MACSEC_SA_ATTR_AN])
1492 return ERR_PTR(-EINVAL);
1493
1494 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1495
1496 dev = get_dev_from_nl(net, attrs);
1497 if (IS_ERR(dev))
1498 return ERR_CAST(dev);
1499
1500 if (*assoc_num >= MACSEC_NUM_AN)
1501 return ERR_PTR(-EINVAL);
1502
1503 secy = &macsec_priv(dev)->secy;
1504 tx_sc = &secy->tx_sc;
1505
1506 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1507 if (!tx_sa)
1508 return ERR_PTR(-ENODEV);
1509
1510 *devp = dev;
1511 *scp = tx_sc;
1512 *secyp = secy;
1513 return tx_sa;
1514 }
1515
1516 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1517 struct nlattr **attrs,
1518 struct nlattr **tb_rxsc,
1519 struct net_device **devp,
1520 struct macsec_secy **secyp)
1521 {
1522 struct net_device *dev;
1523 struct macsec_secy *secy;
1524 struct macsec_rx_sc *rx_sc;
1525 sci_t sci;
1526
1527 dev = get_dev_from_nl(net, attrs);
1528 if (IS_ERR(dev))
1529 return ERR_CAST(dev);
1530
1531 secy = &macsec_priv(dev)->secy;
1532
1533 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1534 return ERR_PTR(-EINVAL);
1535
1536 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1537 rx_sc = find_rx_sc_rtnl(secy, sci);
1538 if (!rx_sc)
1539 return ERR_PTR(-ENODEV);
1540
1541 *secyp = secy;
1542 *devp = dev;
1543
1544 return rx_sc;
1545 }
1546
1547 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1548 struct nlattr **attrs,
1549 struct nlattr **tb_rxsc,
1550 struct nlattr **tb_sa,
1551 struct net_device **devp,
1552 struct macsec_secy **secyp,
1553 struct macsec_rx_sc **scp,
1554 u8 *assoc_num)
1555 {
1556 struct macsec_rx_sc *rx_sc;
1557 struct macsec_rx_sa *rx_sa;
1558
1559 if (!tb_sa[MACSEC_SA_ATTR_AN])
1560 return ERR_PTR(-EINVAL);
1561
1562 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1563 if (*assoc_num >= MACSEC_NUM_AN)
1564 return ERR_PTR(-EINVAL);
1565
1566 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1567 if (IS_ERR(rx_sc))
1568 return ERR_CAST(rx_sc);
1569
1570 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1571 if (!rx_sa)
1572 return ERR_PTR(-ENODEV);
1573
1574 *scp = rx_sc;
1575 return rx_sa;
1576 }
1577
1578
1579 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1580 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1581 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1582 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1583 };
1584
1585 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1586 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1587 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1588 };
1589
1590 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1591 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1592 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1593 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1594 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1595 .len = MACSEC_KEYID_LEN, },
1596 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1597 .len = MACSEC_MAX_KEY_LEN, },
1598 };
1599
1600 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1601 {
1602 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1603 return -EINVAL;
1604
1605 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG],
1606 macsec_genl_sa_policy))
1607 return -EINVAL;
1608
1609 return 0;
1610 }
1611
1612 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1613 {
1614 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1615 return -EINVAL;
1616
1617 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG],
1618 macsec_genl_rxsc_policy))
1619 return -EINVAL;
1620
1621 return 0;
1622 }
1623
1624 static bool validate_add_rxsa(struct nlattr **attrs)
1625 {
1626 if (!attrs[MACSEC_SA_ATTR_AN] ||
1627 !attrs[MACSEC_SA_ATTR_KEY] ||
1628 !attrs[MACSEC_SA_ATTR_KEYID])
1629 return false;
1630
1631 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1632 return false;
1633
1634 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1635 return false;
1636
1637 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1638 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1639 return false;
1640 }
1641
1642 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1643 return false;
1644
1645 return true;
1646 }
1647
1648 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1649 {
1650 struct net_device *dev;
1651 struct nlattr **attrs = info->attrs;
1652 struct macsec_secy *secy;
1653 struct macsec_rx_sc *rx_sc;
1654 struct macsec_rx_sa *rx_sa;
1655 unsigned char assoc_num;
1656 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1657 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1658 int err;
1659
1660 if (!attrs[MACSEC_ATTR_IFINDEX])
1661 return -EINVAL;
1662
1663 if (parse_sa_config(attrs, tb_sa))
1664 return -EINVAL;
1665
1666 if (parse_rxsc_config(attrs, tb_rxsc))
1667 return -EINVAL;
1668
1669 if (!validate_add_rxsa(tb_sa))
1670 return -EINVAL;
1671
1672 rtnl_lock();
1673 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1674 if (IS_ERR(rx_sc)) {
1675 rtnl_unlock();
1676 return PTR_ERR(rx_sc);
1677 }
1678
1679 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1680
1681 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1682 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1683 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1684 rtnl_unlock();
1685 return -EINVAL;
1686 }
1687
1688 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1689 if (rx_sa) {
1690 rtnl_unlock();
1691 return -EBUSY;
1692 }
1693
1694 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1695 if (!rx_sa) {
1696 rtnl_unlock();
1697 return -ENOMEM;
1698 }
1699
1700 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1701 secy->key_len, secy->icv_len);
1702 if (err < 0) {
1703 kfree(rx_sa);
1704 rtnl_unlock();
1705 return err;
1706 }
1707
1708 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1709 spin_lock_bh(&rx_sa->lock);
1710 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1711 spin_unlock_bh(&rx_sa->lock);
1712 }
1713
1714 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1715 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1716
1717 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1718 rx_sa->sc = rx_sc;
1719 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1720
1721 rtnl_unlock();
1722
1723 return 0;
1724 }
1725
1726 static bool validate_add_rxsc(struct nlattr **attrs)
1727 {
1728 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1729 return false;
1730
1731 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1732 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1733 return false;
1734 }
1735
1736 return true;
1737 }
1738
1739 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1740 {
1741 struct net_device *dev;
1742 sci_t sci = MACSEC_UNDEF_SCI;
1743 struct nlattr **attrs = info->attrs;
1744 struct macsec_rx_sc *rx_sc;
1745 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1746
1747 if (!attrs[MACSEC_ATTR_IFINDEX])
1748 return -EINVAL;
1749
1750 if (parse_rxsc_config(attrs, tb_rxsc))
1751 return -EINVAL;
1752
1753 if (!validate_add_rxsc(tb_rxsc))
1754 return -EINVAL;
1755
1756 rtnl_lock();
1757 dev = get_dev_from_nl(genl_info_net(info), attrs);
1758 if (IS_ERR(dev)) {
1759 rtnl_unlock();
1760 return PTR_ERR(dev);
1761 }
1762
1763 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1764
1765 rx_sc = create_rx_sc(dev, sci);
1766 if (IS_ERR(rx_sc)) {
1767 rtnl_unlock();
1768 return PTR_ERR(rx_sc);
1769 }
1770
1771 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1772 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1773
1774 rtnl_unlock();
1775
1776 return 0;
1777 }
1778
1779 static bool validate_add_txsa(struct nlattr **attrs)
1780 {
1781 if (!attrs[MACSEC_SA_ATTR_AN] ||
1782 !attrs[MACSEC_SA_ATTR_PN] ||
1783 !attrs[MACSEC_SA_ATTR_KEY] ||
1784 !attrs[MACSEC_SA_ATTR_KEYID])
1785 return false;
1786
1787 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1788 return false;
1789
1790 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1791 return false;
1792
1793 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1794 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1795 return false;
1796 }
1797
1798 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1799 return false;
1800
1801 return true;
1802 }
1803
1804 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1805 {
1806 struct net_device *dev;
1807 struct nlattr **attrs = info->attrs;
1808 struct macsec_secy *secy;
1809 struct macsec_tx_sc *tx_sc;
1810 struct macsec_tx_sa *tx_sa;
1811 unsigned char assoc_num;
1812 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1813 int err;
1814
1815 if (!attrs[MACSEC_ATTR_IFINDEX])
1816 return -EINVAL;
1817
1818 if (parse_sa_config(attrs, tb_sa))
1819 return -EINVAL;
1820
1821 if (!validate_add_txsa(tb_sa))
1822 return -EINVAL;
1823
1824 rtnl_lock();
1825 dev = get_dev_from_nl(genl_info_net(info), attrs);
1826 if (IS_ERR(dev)) {
1827 rtnl_unlock();
1828 return PTR_ERR(dev);
1829 }
1830
1831 secy = &macsec_priv(dev)->secy;
1832 tx_sc = &secy->tx_sc;
1833
1834 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1835
1836 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1837 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1838 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1839 rtnl_unlock();
1840 return -EINVAL;
1841 }
1842
1843 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1844 if (tx_sa) {
1845 rtnl_unlock();
1846 return -EBUSY;
1847 }
1848
1849 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1850 if (!tx_sa) {
1851 rtnl_unlock();
1852 return -ENOMEM;
1853 }
1854
1855 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1856 secy->key_len, secy->icv_len);
1857 if (err < 0) {
1858 kfree(tx_sa);
1859 rtnl_unlock();
1860 return err;
1861 }
1862
1863 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1864
1865 spin_lock_bh(&tx_sa->lock);
1866 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1867 spin_unlock_bh(&tx_sa->lock);
1868
1869 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1870 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1871
1872 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1873 secy->operational = true;
1874
1875 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1876
1877 rtnl_unlock();
1878
1879 return 0;
1880 }
1881
1882 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1883 {
1884 struct nlattr **attrs = info->attrs;
1885 struct net_device *dev;
1886 struct macsec_secy *secy;
1887 struct macsec_rx_sc *rx_sc;
1888 struct macsec_rx_sa *rx_sa;
1889 u8 assoc_num;
1890 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1891 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1892
1893 if (!attrs[MACSEC_ATTR_IFINDEX])
1894 return -EINVAL;
1895
1896 if (parse_sa_config(attrs, tb_sa))
1897 return -EINVAL;
1898
1899 if (parse_rxsc_config(attrs, tb_rxsc))
1900 return -EINVAL;
1901
1902 rtnl_lock();
1903 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1904 &dev, &secy, &rx_sc, &assoc_num);
1905 if (IS_ERR(rx_sa)) {
1906 rtnl_unlock();
1907 return PTR_ERR(rx_sa);
1908 }
1909
1910 if (rx_sa->active) {
1911 rtnl_unlock();
1912 return -EBUSY;
1913 }
1914
1915 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1916 clear_rx_sa(rx_sa);
1917
1918 rtnl_unlock();
1919
1920 return 0;
1921 }
1922
1923 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1924 {
1925 struct nlattr **attrs = info->attrs;
1926 struct net_device *dev;
1927 struct macsec_secy *secy;
1928 struct macsec_rx_sc *rx_sc;
1929 sci_t sci;
1930 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1931
1932 if (!attrs[MACSEC_ATTR_IFINDEX])
1933 return -EINVAL;
1934
1935 if (parse_rxsc_config(attrs, tb_rxsc))
1936 return -EINVAL;
1937
1938 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1939 return -EINVAL;
1940
1941 rtnl_lock();
1942 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1943 if (IS_ERR(dev)) {
1944 rtnl_unlock();
1945 return PTR_ERR(dev);
1946 }
1947
1948 secy = &macsec_priv(dev)->secy;
1949 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1950
1951 rx_sc = del_rx_sc(secy, sci);
1952 if (!rx_sc) {
1953 rtnl_unlock();
1954 return -ENODEV;
1955 }
1956
1957 free_rx_sc(rx_sc);
1958 rtnl_unlock();
1959
1960 return 0;
1961 }
1962
1963 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1964 {
1965 struct nlattr **attrs = info->attrs;
1966 struct net_device *dev;
1967 struct macsec_secy *secy;
1968 struct macsec_tx_sc *tx_sc;
1969 struct macsec_tx_sa *tx_sa;
1970 u8 assoc_num;
1971 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1972
1973 if (!attrs[MACSEC_ATTR_IFINDEX])
1974 return -EINVAL;
1975
1976 if (parse_sa_config(attrs, tb_sa))
1977 return -EINVAL;
1978
1979 rtnl_lock();
1980 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1981 &dev, &secy, &tx_sc, &assoc_num);
1982 if (IS_ERR(tx_sa)) {
1983 rtnl_unlock();
1984 return PTR_ERR(tx_sa);
1985 }
1986
1987 if (tx_sa->active) {
1988 rtnl_unlock();
1989 return -EBUSY;
1990 }
1991
1992 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
1993 clear_tx_sa(tx_sa);
1994
1995 rtnl_unlock();
1996
1997 return 0;
1998 }
1999
2000 static bool validate_upd_sa(struct nlattr **attrs)
2001 {
2002 if (!attrs[MACSEC_SA_ATTR_AN] ||
2003 attrs[MACSEC_SA_ATTR_KEY] ||
2004 attrs[MACSEC_SA_ATTR_KEYID])
2005 return false;
2006
2007 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2008 return false;
2009
2010 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
2011 return false;
2012
2013 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2014 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2015 return false;
2016 }
2017
2018 return true;
2019 }
2020
2021 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2022 {
2023 struct nlattr **attrs = info->attrs;
2024 struct net_device *dev;
2025 struct macsec_secy *secy;
2026 struct macsec_tx_sc *tx_sc;
2027 struct macsec_tx_sa *tx_sa;
2028 u8 assoc_num;
2029 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2030
2031 if (!attrs[MACSEC_ATTR_IFINDEX])
2032 return -EINVAL;
2033
2034 if (parse_sa_config(attrs, tb_sa))
2035 return -EINVAL;
2036
2037 if (!validate_upd_sa(tb_sa))
2038 return -EINVAL;
2039
2040 rtnl_lock();
2041 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2042 &dev, &secy, &tx_sc, &assoc_num);
2043 if (IS_ERR(tx_sa)) {
2044 rtnl_unlock();
2045 return PTR_ERR(tx_sa);
2046 }
2047
2048 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2049 spin_lock_bh(&tx_sa->lock);
2050 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2051 spin_unlock_bh(&tx_sa->lock);
2052 }
2053
2054 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2055 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2056
2057 if (assoc_num == tx_sc->encoding_sa)
2058 secy->operational = tx_sa->active;
2059
2060 rtnl_unlock();
2061
2062 return 0;
2063 }
2064
2065 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2066 {
2067 struct nlattr **attrs = info->attrs;
2068 struct net_device *dev;
2069 struct macsec_secy *secy;
2070 struct macsec_rx_sc *rx_sc;
2071 struct macsec_rx_sa *rx_sa;
2072 u8 assoc_num;
2073 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2074 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2075
2076 if (!attrs[MACSEC_ATTR_IFINDEX])
2077 return -EINVAL;
2078
2079 if (parse_rxsc_config(attrs, tb_rxsc))
2080 return -EINVAL;
2081
2082 if (parse_sa_config(attrs, tb_sa))
2083 return -EINVAL;
2084
2085 if (!validate_upd_sa(tb_sa))
2086 return -EINVAL;
2087
2088 rtnl_lock();
2089 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2090 &dev, &secy, &rx_sc, &assoc_num);
2091 if (IS_ERR(rx_sa)) {
2092 rtnl_unlock();
2093 return PTR_ERR(rx_sa);
2094 }
2095
2096 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2097 spin_lock_bh(&rx_sa->lock);
2098 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2099 spin_unlock_bh(&rx_sa->lock);
2100 }
2101
2102 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2103 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2104
2105 rtnl_unlock();
2106 return 0;
2107 }
2108
2109 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2110 {
2111 struct nlattr **attrs = info->attrs;
2112 struct net_device *dev;
2113 struct macsec_secy *secy;
2114 struct macsec_rx_sc *rx_sc;
2115 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2116
2117 if (!attrs[MACSEC_ATTR_IFINDEX])
2118 return -EINVAL;
2119
2120 if (parse_rxsc_config(attrs, tb_rxsc))
2121 return -EINVAL;
2122
2123 if (!validate_add_rxsc(tb_rxsc))
2124 return -EINVAL;
2125
2126 rtnl_lock();
2127 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2128 if (IS_ERR(rx_sc)) {
2129 rtnl_unlock();
2130 return PTR_ERR(rx_sc);
2131 }
2132
2133 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2134 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2135
2136 if (rx_sc->active != new)
2137 secy->n_rx_sc += new ? 1 : -1;
2138
2139 rx_sc->active = new;
2140 }
2141
2142 rtnl_unlock();
2143
2144 return 0;
2145 }
2146
2147 static int copy_tx_sa_stats(struct sk_buff *skb,
2148 struct macsec_tx_sa_stats __percpu *pstats)
2149 {
2150 struct macsec_tx_sa_stats sum = {0, };
2151 int cpu;
2152
2153 for_each_possible_cpu(cpu) {
2154 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2155
2156 sum.OutPktsProtected += stats->OutPktsProtected;
2157 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2158 }
2159
2160 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2161 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2162 return -EMSGSIZE;
2163
2164 return 0;
2165 }
2166
2167 static int copy_rx_sa_stats(struct sk_buff *skb,
2168 struct macsec_rx_sa_stats __percpu *pstats)
2169 {
2170 struct macsec_rx_sa_stats sum = {0, };
2171 int cpu;
2172
2173 for_each_possible_cpu(cpu) {
2174 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2175
2176 sum.InPktsOK += stats->InPktsOK;
2177 sum.InPktsInvalid += stats->InPktsInvalid;
2178 sum.InPktsNotValid += stats->InPktsNotValid;
2179 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2180 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2181 }
2182
2183 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2184 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2185 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2186 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2187 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2188 return -EMSGSIZE;
2189
2190 return 0;
2191 }
2192
2193 static int copy_rx_sc_stats(struct sk_buff *skb,
2194 struct pcpu_rx_sc_stats __percpu *pstats)
2195 {
2196 struct macsec_rx_sc_stats sum = {0, };
2197 int cpu;
2198
2199 for_each_possible_cpu(cpu) {
2200 const struct pcpu_rx_sc_stats *stats;
2201 struct macsec_rx_sc_stats tmp;
2202 unsigned int start;
2203
2204 stats = per_cpu_ptr(pstats, cpu);
2205 do {
2206 start = u64_stats_fetch_begin_irq(&stats->syncp);
2207 memcpy(&tmp, &stats->stats, sizeof(tmp));
2208 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2209
2210 sum.InOctetsValidated += tmp.InOctetsValidated;
2211 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2212 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2213 sum.InPktsDelayed += tmp.InPktsDelayed;
2214 sum.InPktsOK += tmp.InPktsOK;
2215 sum.InPktsInvalid += tmp.InPktsInvalid;
2216 sum.InPktsLate += tmp.InPktsLate;
2217 sum.InPktsNotValid += tmp.InPktsNotValid;
2218 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2219 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2220 }
2221
2222 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2223 sum.InOctetsValidated,
2224 MACSEC_RXSC_STATS_ATTR_PAD) ||
2225 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2226 sum.InOctetsDecrypted,
2227 MACSEC_RXSC_STATS_ATTR_PAD) ||
2228 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2229 sum.InPktsUnchecked,
2230 MACSEC_RXSC_STATS_ATTR_PAD) ||
2231 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2232 sum.InPktsDelayed,
2233 MACSEC_RXSC_STATS_ATTR_PAD) ||
2234 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2235 sum.InPktsOK,
2236 MACSEC_RXSC_STATS_ATTR_PAD) ||
2237 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2238 sum.InPktsInvalid,
2239 MACSEC_RXSC_STATS_ATTR_PAD) ||
2240 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2241 sum.InPktsLate,
2242 MACSEC_RXSC_STATS_ATTR_PAD) ||
2243 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2244 sum.InPktsNotValid,
2245 MACSEC_RXSC_STATS_ATTR_PAD) ||
2246 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2247 sum.InPktsNotUsingSA,
2248 MACSEC_RXSC_STATS_ATTR_PAD) ||
2249 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2250 sum.InPktsUnusedSA,
2251 MACSEC_RXSC_STATS_ATTR_PAD))
2252 return -EMSGSIZE;
2253
2254 return 0;
2255 }
2256
2257 static int copy_tx_sc_stats(struct sk_buff *skb,
2258 struct pcpu_tx_sc_stats __percpu *pstats)
2259 {
2260 struct macsec_tx_sc_stats sum = {0, };
2261 int cpu;
2262
2263 for_each_possible_cpu(cpu) {
2264 const struct pcpu_tx_sc_stats *stats;
2265 struct macsec_tx_sc_stats tmp;
2266 unsigned int start;
2267
2268 stats = per_cpu_ptr(pstats, cpu);
2269 do {
2270 start = u64_stats_fetch_begin_irq(&stats->syncp);
2271 memcpy(&tmp, &stats->stats, sizeof(tmp));
2272 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2273
2274 sum.OutPktsProtected += tmp.OutPktsProtected;
2275 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2276 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2277 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2278 }
2279
2280 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2281 sum.OutPktsProtected,
2282 MACSEC_TXSC_STATS_ATTR_PAD) ||
2283 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2284 sum.OutPktsEncrypted,
2285 MACSEC_TXSC_STATS_ATTR_PAD) ||
2286 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2287 sum.OutOctetsProtected,
2288 MACSEC_TXSC_STATS_ATTR_PAD) ||
2289 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2290 sum.OutOctetsEncrypted,
2291 MACSEC_TXSC_STATS_ATTR_PAD))
2292 return -EMSGSIZE;
2293
2294 return 0;
2295 }
2296
2297 static int copy_secy_stats(struct sk_buff *skb,
2298 struct pcpu_secy_stats __percpu *pstats)
2299 {
2300 struct macsec_dev_stats sum = {0, };
2301 int cpu;
2302
2303 for_each_possible_cpu(cpu) {
2304 const struct pcpu_secy_stats *stats;
2305 struct macsec_dev_stats tmp;
2306 unsigned int start;
2307
2308 stats = per_cpu_ptr(pstats, cpu);
2309 do {
2310 start = u64_stats_fetch_begin_irq(&stats->syncp);
2311 memcpy(&tmp, &stats->stats, sizeof(tmp));
2312 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2313
2314 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2315 sum.InPktsUntagged += tmp.InPktsUntagged;
2316 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2317 sum.InPktsNoTag += tmp.InPktsNoTag;
2318 sum.InPktsBadTag += tmp.InPktsBadTag;
2319 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2320 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2321 sum.InPktsOverrun += tmp.InPktsOverrun;
2322 }
2323
2324 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2325 sum.OutPktsUntagged,
2326 MACSEC_SECY_STATS_ATTR_PAD) ||
2327 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2328 sum.InPktsUntagged,
2329 MACSEC_SECY_STATS_ATTR_PAD) ||
2330 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2331 sum.OutPktsTooLong,
2332 MACSEC_SECY_STATS_ATTR_PAD) ||
2333 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2334 sum.InPktsNoTag,
2335 MACSEC_SECY_STATS_ATTR_PAD) ||
2336 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2337 sum.InPktsBadTag,
2338 MACSEC_SECY_STATS_ATTR_PAD) ||
2339 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2340 sum.InPktsUnknownSCI,
2341 MACSEC_SECY_STATS_ATTR_PAD) ||
2342 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2343 sum.InPktsNoSCI,
2344 MACSEC_SECY_STATS_ATTR_PAD) ||
2345 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2346 sum.InPktsOverrun,
2347 MACSEC_SECY_STATS_ATTR_PAD))
2348 return -EMSGSIZE;
2349
2350 return 0;
2351 }
2352
2353 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2354 {
2355 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2356 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2357
2358 if (!secy_nest)
2359 return 1;
2360
2361 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2362 MACSEC_SECY_ATTR_PAD) ||
2363 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2364 MACSEC_DEFAULT_CIPHER_ID,
2365 MACSEC_SECY_ATTR_PAD) ||
2366 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2367 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2368 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2369 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2370 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2371 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2372 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2373 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2374 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2375 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2376 goto cancel;
2377
2378 if (secy->replay_protect) {
2379 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2380 goto cancel;
2381 }
2382
2383 nla_nest_end(skb, secy_nest);
2384 return 0;
2385
2386 cancel:
2387 nla_nest_cancel(skb, secy_nest);
2388 return 1;
2389 }
2390
2391 static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2392 struct sk_buff *skb, struct netlink_callback *cb)
2393 {
2394 struct macsec_rx_sc *rx_sc;
2395 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2396 struct nlattr *txsa_list, *rxsc_list;
2397 int i, j;
2398 void *hdr;
2399 struct nlattr *attr;
2400
2401 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2402 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2403 if (!hdr)
2404 return -EMSGSIZE;
2405
2406 genl_dump_check_consistent(cb, hdr, &macsec_fam);
2407
2408 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2409 goto nla_put_failure;
2410
2411 if (nla_put_secy(secy, skb))
2412 goto nla_put_failure;
2413
2414 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2415 if (!attr)
2416 goto nla_put_failure;
2417 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2418 nla_nest_cancel(skb, attr);
2419 goto nla_put_failure;
2420 }
2421 nla_nest_end(skb, attr);
2422
2423 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2424 if (!attr)
2425 goto nla_put_failure;
2426 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2427 nla_nest_cancel(skb, attr);
2428 goto nla_put_failure;
2429 }
2430 nla_nest_end(skb, attr);
2431
2432 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2433 if (!txsa_list)
2434 goto nla_put_failure;
2435 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2436 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2437 struct nlattr *txsa_nest;
2438
2439 if (!tx_sa)
2440 continue;
2441
2442 txsa_nest = nla_nest_start(skb, j++);
2443 if (!txsa_nest) {
2444 nla_nest_cancel(skb, txsa_list);
2445 goto nla_put_failure;
2446 }
2447
2448 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2449 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2450 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2451 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2452 nla_nest_cancel(skb, txsa_nest);
2453 nla_nest_cancel(skb, txsa_list);
2454 goto nla_put_failure;
2455 }
2456
2457 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2458 if (!attr) {
2459 nla_nest_cancel(skb, txsa_nest);
2460 nla_nest_cancel(skb, txsa_list);
2461 goto nla_put_failure;
2462 }
2463 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2464 nla_nest_cancel(skb, attr);
2465 nla_nest_cancel(skb, txsa_nest);
2466 nla_nest_cancel(skb, txsa_list);
2467 goto nla_put_failure;
2468 }
2469 nla_nest_end(skb, attr);
2470
2471 nla_nest_end(skb, txsa_nest);
2472 }
2473 nla_nest_end(skb, txsa_list);
2474
2475 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2476 if (!rxsc_list)
2477 goto nla_put_failure;
2478
2479 j = 1;
2480 for_each_rxsc_rtnl(secy, rx_sc) {
2481 int k;
2482 struct nlattr *rxsa_list;
2483 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2484
2485 if (!rxsc_nest) {
2486 nla_nest_cancel(skb, rxsc_list);
2487 goto nla_put_failure;
2488 }
2489
2490 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2491 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
2492 MACSEC_RXSC_ATTR_PAD)) {
2493 nla_nest_cancel(skb, rxsc_nest);
2494 nla_nest_cancel(skb, rxsc_list);
2495 goto nla_put_failure;
2496 }
2497
2498 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2499 if (!attr) {
2500 nla_nest_cancel(skb, rxsc_nest);
2501 nla_nest_cancel(skb, rxsc_list);
2502 goto nla_put_failure;
2503 }
2504 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2505 nla_nest_cancel(skb, attr);
2506 nla_nest_cancel(skb, rxsc_nest);
2507 nla_nest_cancel(skb, rxsc_list);
2508 goto nla_put_failure;
2509 }
2510 nla_nest_end(skb, attr);
2511
2512 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2513 if (!rxsa_list) {
2514 nla_nest_cancel(skb, rxsc_nest);
2515 nla_nest_cancel(skb, rxsc_list);
2516 goto nla_put_failure;
2517 }
2518
2519 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2520 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2521 struct nlattr *rxsa_nest;
2522
2523 if (!rx_sa)
2524 continue;
2525
2526 rxsa_nest = nla_nest_start(skb, k++);
2527 if (!rxsa_nest) {
2528 nla_nest_cancel(skb, rxsa_list);
2529 nla_nest_cancel(skb, rxsc_nest);
2530 nla_nest_cancel(skb, rxsc_list);
2531 goto nla_put_failure;
2532 }
2533
2534 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2535 if (!attr) {
2536 nla_nest_cancel(skb, rxsa_list);
2537 nla_nest_cancel(skb, rxsc_nest);
2538 nla_nest_cancel(skb, rxsc_list);
2539 goto nla_put_failure;
2540 }
2541 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2542 nla_nest_cancel(skb, attr);
2543 nla_nest_cancel(skb, rxsa_list);
2544 nla_nest_cancel(skb, rxsc_nest);
2545 nla_nest_cancel(skb, rxsc_list);
2546 goto nla_put_failure;
2547 }
2548 nla_nest_end(skb, attr);
2549
2550 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2551 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2552 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2553 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2554 nla_nest_cancel(skb, rxsa_nest);
2555 nla_nest_cancel(skb, rxsc_nest);
2556 nla_nest_cancel(skb, rxsc_list);
2557 goto nla_put_failure;
2558 }
2559 nla_nest_end(skb, rxsa_nest);
2560 }
2561
2562 nla_nest_end(skb, rxsa_list);
2563 nla_nest_end(skb, rxsc_nest);
2564 }
2565
2566 nla_nest_end(skb, rxsc_list);
2567
2568 genlmsg_end(skb, hdr);
2569
2570 return 0;
2571
2572 nla_put_failure:
2573 genlmsg_cancel(skb, hdr);
2574 return -EMSGSIZE;
2575 }
2576
2577 static int macsec_generation = 1; /* protected by RTNL */
2578
2579 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2580 {
2581 struct net *net = sock_net(skb->sk);
2582 struct net_device *dev;
2583 int dev_idx, d;
2584
2585 dev_idx = cb->args[0];
2586
2587 d = 0;
2588 rtnl_lock();
2589
2590 cb->seq = macsec_generation;
2591
2592 for_each_netdev(net, dev) {
2593 struct macsec_secy *secy;
2594
2595 if (d < dev_idx)
2596 goto next;
2597
2598 if (!netif_is_macsec(dev))
2599 goto next;
2600
2601 secy = &macsec_priv(dev)->secy;
2602 if (dump_secy(secy, dev, skb, cb) < 0)
2603 goto done;
2604 next:
2605 d++;
2606 }
2607
2608 done:
2609 rtnl_unlock();
2610 cb->args[0] = d;
2611 return skb->len;
2612 }
2613
2614 static const struct genl_ops macsec_genl_ops[] = {
2615 {
2616 .cmd = MACSEC_CMD_GET_TXSC,
2617 .dumpit = macsec_dump_txsc,
2618 .policy = macsec_genl_policy,
2619 },
2620 {
2621 .cmd = MACSEC_CMD_ADD_RXSC,
2622 .doit = macsec_add_rxsc,
2623 .policy = macsec_genl_policy,
2624 .flags = GENL_ADMIN_PERM,
2625 },
2626 {
2627 .cmd = MACSEC_CMD_DEL_RXSC,
2628 .doit = macsec_del_rxsc,
2629 .policy = macsec_genl_policy,
2630 .flags = GENL_ADMIN_PERM,
2631 },
2632 {
2633 .cmd = MACSEC_CMD_UPD_RXSC,
2634 .doit = macsec_upd_rxsc,
2635 .policy = macsec_genl_policy,
2636 .flags = GENL_ADMIN_PERM,
2637 },
2638 {
2639 .cmd = MACSEC_CMD_ADD_TXSA,
2640 .doit = macsec_add_txsa,
2641 .policy = macsec_genl_policy,
2642 .flags = GENL_ADMIN_PERM,
2643 },
2644 {
2645 .cmd = MACSEC_CMD_DEL_TXSA,
2646 .doit = macsec_del_txsa,
2647 .policy = macsec_genl_policy,
2648 .flags = GENL_ADMIN_PERM,
2649 },
2650 {
2651 .cmd = MACSEC_CMD_UPD_TXSA,
2652 .doit = macsec_upd_txsa,
2653 .policy = macsec_genl_policy,
2654 .flags = GENL_ADMIN_PERM,
2655 },
2656 {
2657 .cmd = MACSEC_CMD_ADD_RXSA,
2658 .doit = macsec_add_rxsa,
2659 .policy = macsec_genl_policy,
2660 .flags = GENL_ADMIN_PERM,
2661 },
2662 {
2663 .cmd = MACSEC_CMD_DEL_RXSA,
2664 .doit = macsec_del_rxsa,
2665 .policy = macsec_genl_policy,
2666 .flags = GENL_ADMIN_PERM,
2667 },
2668 {
2669 .cmd = MACSEC_CMD_UPD_RXSA,
2670 .doit = macsec_upd_rxsa,
2671 .policy = macsec_genl_policy,
2672 .flags = GENL_ADMIN_PERM,
2673 },
2674 };
2675
2676 static struct genl_family macsec_fam __ro_after_init = {
2677 .name = MACSEC_GENL_NAME,
2678 .hdrsize = 0,
2679 .version = MACSEC_GENL_VERSION,
2680 .maxattr = MACSEC_ATTR_MAX,
2681 .netnsok = true,
2682 .module = THIS_MODULE,
2683 .ops = macsec_genl_ops,
2684 .n_ops = ARRAY_SIZE(macsec_genl_ops),
2685 };
2686
2687 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2688 struct net_device *dev)
2689 {
2690 struct macsec_dev *macsec = netdev_priv(dev);
2691 struct macsec_secy *secy = &macsec->secy;
2692 struct pcpu_secy_stats *secy_stats;
2693 int ret, len;
2694
2695 /* 10.5 */
2696 if (!secy->protect_frames) {
2697 secy_stats = this_cpu_ptr(macsec->stats);
2698 u64_stats_update_begin(&secy_stats->syncp);
2699 secy_stats->stats.OutPktsUntagged++;
2700 u64_stats_update_end(&secy_stats->syncp);
2701 skb->dev = macsec->real_dev;
2702 len = skb->len;
2703 ret = dev_queue_xmit(skb);
2704 count_tx(dev, ret, len);
2705 return ret;
2706 }
2707
2708 if (!secy->operational) {
2709 kfree_skb(skb);
2710 dev->stats.tx_dropped++;
2711 return NETDEV_TX_OK;
2712 }
2713
2714 skb = macsec_encrypt(skb, dev);
2715 if (IS_ERR(skb)) {
2716 if (PTR_ERR(skb) != -EINPROGRESS)
2717 dev->stats.tx_dropped++;
2718 return NETDEV_TX_OK;
2719 }
2720
2721 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2722
2723 macsec_encrypt_finish(skb, dev);
2724 len = skb->len;
2725 ret = dev_queue_xmit(skb);
2726 count_tx(dev, ret, len);
2727 return ret;
2728 }
2729
2730 #define MACSEC_FEATURES \
2731 (NETIF_F_SG | NETIF_F_HIGHDMA)
2732 static struct lock_class_key macsec_netdev_addr_lock_key;
2733
2734 static int macsec_dev_init(struct net_device *dev)
2735 {
2736 struct macsec_dev *macsec = macsec_priv(dev);
2737 struct net_device *real_dev = macsec->real_dev;
2738 int err;
2739
2740 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2741 if (!dev->tstats)
2742 return -ENOMEM;
2743
2744 err = gro_cells_init(&macsec->gro_cells, dev);
2745 if (err) {
2746 free_percpu(dev->tstats);
2747 return err;
2748 }
2749
2750 dev->features = real_dev->features & MACSEC_FEATURES;
2751 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2752
2753 dev->needed_headroom = real_dev->needed_headroom +
2754 MACSEC_NEEDED_HEADROOM;
2755 dev->needed_tailroom = real_dev->needed_tailroom +
2756 MACSEC_NEEDED_TAILROOM;
2757
2758 if (is_zero_ether_addr(dev->dev_addr))
2759 eth_hw_addr_inherit(dev, real_dev);
2760 if (is_zero_ether_addr(dev->broadcast))
2761 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2762
2763 return 0;
2764 }
2765
2766 static void macsec_dev_uninit(struct net_device *dev)
2767 {
2768 struct macsec_dev *macsec = macsec_priv(dev);
2769
2770 gro_cells_destroy(&macsec->gro_cells);
2771 free_percpu(dev->tstats);
2772 }
2773
2774 static netdev_features_t macsec_fix_features(struct net_device *dev,
2775 netdev_features_t features)
2776 {
2777 struct macsec_dev *macsec = macsec_priv(dev);
2778 struct net_device *real_dev = macsec->real_dev;
2779
2780 features &= (real_dev->features & MACSEC_FEATURES) |
2781 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
2782 features |= NETIF_F_LLTX;
2783
2784 return features;
2785 }
2786
2787 static int macsec_dev_open(struct net_device *dev)
2788 {
2789 struct macsec_dev *macsec = macsec_priv(dev);
2790 struct net_device *real_dev = macsec->real_dev;
2791 int err;
2792
2793 if (!(real_dev->flags & IFF_UP))
2794 return -ENETDOWN;
2795
2796 err = dev_uc_add(real_dev, dev->dev_addr);
2797 if (err < 0)
2798 return err;
2799
2800 if (dev->flags & IFF_ALLMULTI) {
2801 err = dev_set_allmulti(real_dev, 1);
2802 if (err < 0)
2803 goto del_unicast;
2804 }
2805
2806 if (dev->flags & IFF_PROMISC) {
2807 err = dev_set_promiscuity(real_dev, 1);
2808 if (err < 0)
2809 goto clear_allmulti;
2810 }
2811
2812 if (netif_carrier_ok(real_dev))
2813 netif_carrier_on(dev);
2814
2815 return 0;
2816 clear_allmulti:
2817 if (dev->flags & IFF_ALLMULTI)
2818 dev_set_allmulti(real_dev, -1);
2819 del_unicast:
2820 dev_uc_del(real_dev, dev->dev_addr);
2821 netif_carrier_off(dev);
2822 return err;
2823 }
2824
2825 static int macsec_dev_stop(struct net_device *dev)
2826 {
2827 struct macsec_dev *macsec = macsec_priv(dev);
2828 struct net_device *real_dev = macsec->real_dev;
2829
2830 netif_carrier_off(dev);
2831
2832 dev_mc_unsync(real_dev, dev);
2833 dev_uc_unsync(real_dev, dev);
2834
2835 if (dev->flags & IFF_ALLMULTI)
2836 dev_set_allmulti(real_dev, -1);
2837
2838 if (dev->flags & IFF_PROMISC)
2839 dev_set_promiscuity(real_dev, -1);
2840
2841 dev_uc_del(real_dev, dev->dev_addr);
2842
2843 return 0;
2844 }
2845
2846 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2847 {
2848 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2849
2850 if (!(dev->flags & IFF_UP))
2851 return;
2852
2853 if (change & IFF_ALLMULTI)
2854 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2855
2856 if (change & IFF_PROMISC)
2857 dev_set_promiscuity(real_dev,
2858 dev->flags & IFF_PROMISC ? 1 : -1);
2859 }
2860
2861 static void macsec_dev_set_rx_mode(struct net_device *dev)
2862 {
2863 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2864
2865 dev_mc_sync(real_dev, dev);
2866 dev_uc_sync(real_dev, dev);
2867 }
2868
2869 static int macsec_set_mac_address(struct net_device *dev, void *p)
2870 {
2871 struct macsec_dev *macsec = macsec_priv(dev);
2872 struct net_device *real_dev = macsec->real_dev;
2873 struct sockaddr *addr = p;
2874 int err;
2875
2876 if (!is_valid_ether_addr(addr->sa_data))
2877 return -EADDRNOTAVAIL;
2878
2879 if (!(dev->flags & IFF_UP))
2880 goto out;
2881
2882 err = dev_uc_add(real_dev, addr->sa_data);
2883 if (err < 0)
2884 return err;
2885
2886 dev_uc_del(real_dev, dev->dev_addr);
2887
2888 out:
2889 ether_addr_copy(dev->dev_addr, addr->sa_data);
2890 return 0;
2891 }
2892
2893 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2894 {
2895 struct macsec_dev *macsec = macsec_priv(dev);
2896 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2897
2898 if (macsec->real_dev->mtu - extra < new_mtu)
2899 return -ERANGE;
2900
2901 dev->mtu = new_mtu;
2902
2903 return 0;
2904 }
2905
2906 static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev,
2907 struct rtnl_link_stats64 *s)
2908 {
2909 int cpu;
2910
2911 if (!dev->tstats)
2912 return s;
2913
2914 for_each_possible_cpu(cpu) {
2915 struct pcpu_sw_netstats *stats;
2916 struct pcpu_sw_netstats tmp;
2917 int start;
2918
2919 stats = per_cpu_ptr(dev->tstats, cpu);
2920 do {
2921 start = u64_stats_fetch_begin_irq(&stats->syncp);
2922 tmp.rx_packets = stats->rx_packets;
2923 tmp.rx_bytes = stats->rx_bytes;
2924 tmp.tx_packets = stats->tx_packets;
2925 tmp.tx_bytes = stats->tx_bytes;
2926 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2927
2928 s->rx_packets += tmp.rx_packets;
2929 s->rx_bytes += tmp.rx_bytes;
2930 s->tx_packets += tmp.tx_packets;
2931 s->tx_bytes += tmp.tx_bytes;
2932 }
2933
2934 s->rx_dropped = dev->stats.rx_dropped;
2935 s->tx_dropped = dev->stats.tx_dropped;
2936
2937 return s;
2938 }
2939
2940 static int macsec_get_iflink(const struct net_device *dev)
2941 {
2942 return macsec_priv(dev)->real_dev->ifindex;
2943 }
2944
2945
2946 static int macsec_get_nest_level(struct net_device *dev)
2947 {
2948 return macsec_priv(dev)->nest_level;
2949 }
2950
2951
2952 static const struct net_device_ops macsec_netdev_ops = {
2953 .ndo_init = macsec_dev_init,
2954 .ndo_uninit = macsec_dev_uninit,
2955 .ndo_open = macsec_dev_open,
2956 .ndo_stop = macsec_dev_stop,
2957 .ndo_fix_features = macsec_fix_features,
2958 .ndo_change_mtu = macsec_change_mtu,
2959 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2960 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2961 .ndo_set_mac_address = macsec_set_mac_address,
2962 .ndo_start_xmit = macsec_start_xmit,
2963 .ndo_get_stats64 = macsec_get_stats64,
2964 .ndo_get_iflink = macsec_get_iflink,
2965 .ndo_get_lock_subclass = macsec_get_nest_level,
2966 };
2967
2968 static const struct device_type macsec_type = {
2969 .name = "macsec",
2970 };
2971
2972 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2973 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2974 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2975 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2976 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2977 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2978 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2979 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
2980 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
2981 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
2982 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
2983 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
2984 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
2985 };
2986
2987 static void macsec_free_netdev(struct net_device *dev)
2988 {
2989 struct macsec_dev *macsec = macsec_priv(dev);
2990 struct net_device *real_dev = macsec->real_dev;
2991
2992 free_percpu(macsec->stats);
2993 free_percpu(macsec->secy.tx_sc.stats);
2994
2995 dev_put(real_dev);
2996 free_netdev(dev);
2997 }
2998
2999 static void macsec_setup(struct net_device *dev)
3000 {
3001 ether_setup(dev);
3002 dev->min_mtu = 0;
3003 dev->max_mtu = ETH_MAX_MTU;
3004 dev->priv_flags |= IFF_NO_QUEUE;
3005 dev->netdev_ops = &macsec_netdev_ops;
3006 dev->destructor = macsec_free_netdev;
3007 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3008
3009 eth_zero_addr(dev->broadcast);
3010 }
3011
3012 static void macsec_changelink_common(struct net_device *dev,
3013 struct nlattr *data[])
3014 {
3015 struct macsec_secy *secy;
3016 struct macsec_tx_sc *tx_sc;
3017
3018 secy = &macsec_priv(dev)->secy;
3019 tx_sc = &secy->tx_sc;
3020
3021 if (data[IFLA_MACSEC_ENCODING_SA]) {
3022 struct macsec_tx_sa *tx_sa;
3023
3024 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3025 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3026
3027 secy->operational = tx_sa && tx_sa->active;
3028 }
3029
3030 if (data[IFLA_MACSEC_WINDOW])
3031 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3032
3033 if (data[IFLA_MACSEC_ENCRYPT])
3034 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3035
3036 if (data[IFLA_MACSEC_PROTECT])
3037 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3038
3039 if (data[IFLA_MACSEC_INC_SCI])
3040 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3041
3042 if (data[IFLA_MACSEC_ES])
3043 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3044
3045 if (data[IFLA_MACSEC_SCB])
3046 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3047
3048 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3049 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3050
3051 if (data[IFLA_MACSEC_VALIDATION])
3052 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3053 }
3054
3055 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3056 struct nlattr *data[])
3057 {
3058 if (!data)
3059 return 0;
3060
3061 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3062 data[IFLA_MACSEC_ICV_LEN] ||
3063 data[IFLA_MACSEC_SCI] ||
3064 data[IFLA_MACSEC_PORT])
3065 return -EINVAL;
3066
3067 macsec_changelink_common(dev, data);
3068
3069 return 0;
3070 }
3071
3072 static void macsec_del_dev(struct macsec_dev *macsec)
3073 {
3074 int i;
3075
3076 while (macsec->secy.rx_sc) {
3077 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3078
3079 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3080 free_rx_sc(rx_sc);
3081 }
3082
3083 for (i = 0; i < MACSEC_NUM_AN; i++) {
3084 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3085
3086 if (sa) {
3087 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3088 clear_tx_sa(sa);
3089 }
3090 }
3091 }
3092
3093 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3094 {
3095 struct macsec_dev *macsec = macsec_priv(dev);
3096 struct net_device *real_dev = macsec->real_dev;
3097
3098 unregister_netdevice_queue(dev, head);
3099 list_del_rcu(&macsec->secys);
3100 macsec_del_dev(macsec);
3101 netdev_upper_dev_unlink(real_dev, dev);
3102
3103 macsec_generation++;
3104 }
3105
3106 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3107 {
3108 struct macsec_dev *macsec = macsec_priv(dev);
3109 struct net_device *real_dev = macsec->real_dev;
3110 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3111
3112 macsec_common_dellink(dev, head);
3113
3114 if (list_empty(&rxd->secys)) {
3115 netdev_rx_handler_unregister(real_dev);
3116 kfree(rxd);
3117 }
3118 }
3119
3120 static int register_macsec_dev(struct net_device *real_dev,
3121 struct net_device *dev)
3122 {
3123 struct macsec_dev *macsec = macsec_priv(dev);
3124 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3125
3126 if (!rxd) {
3127 int err;
3128
3129 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3130 if (!rxd)
3131 return -ENOMEM;
3132
3133 INIT_LIST_HEAD(&rxd->secys);
3134
3135 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3136 rxd);
3137 if (err < 0) {
3138 kfree(rxd);
3139 return err;
3140 }
3141 }
3142
3143 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3144 return 0;
3145 }
3146
3147 static bool sci_exists(struct net_device *dev, sci_t sci)
3148 {
3149 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3150 struct macsec_dev *macsec;
3151
3152 list_for_each_entry(macsec, &rxd->secys, secys) {
3153 if (macsec->secy.sci == sci)
3154 return true;
3155 }
3156
3157 return false;
3158 }
3159
3160 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3161 {
3162 return make_sci(dev->dev_addr, port);
3163 }
3164
3165 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3166 {
3167 struct macsec_dev *macsec = macsec_priv(dev);
3168 struct macsec_secy *secy = &macsec->secy;
3169
3170 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3171 if (!macsec->stats)
3172 return -ENOMEM;
3173
3174 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3175 if (!secy->tx_sc.stats) {
3176 free_percpu(macsec->stats);
3177 return -ENOMEM;
3178 }
3179
3180 if (sci == MACSEC_UNDEF_SCI)
3181 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3182
3183 secy->netdev = dev;
3184 secy->operational = true;
3185 secy->key_len = DEFAULT_SAK_LEN;
3186 secy->icv_len = icv_len;
3187 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3188 secy->protect_frames = true;
3189 secy->replay_protect = false;
3190
3191 secy->sci = sci;
3192 secy->tx_sc.active = true;
3193 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3194 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3195 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3196 secy->tx_sc.end_station = false;
3197 secy->tx_sc.scb = false;
3198
3199 return 0;
3200 }
3201
3202 static int macsec_newlink(struct net *net, struct net_device *dev,
3203 struct nlattr *tb[], struct nlattr *data[])
3204 {
3205 struct macsec_dev *macsec = macsec_priv(dev);
3206 struct net_device *real_dev;
3207 int err;
3208 sci_t sci;
3209 u8 icv_len = DEFAULT_ICV_LEN;
3210 rx_handler_func_t *rx_handler;
3211
3212 if (!tb[IFLA_LINK])
3213 return -EINVAL;
3214 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3215 if (!real_dev)
3216 return -ENODEV;
3217
3218 dev->priv_flags |= IFF_MACSEC;
3219
3220 macsec->real_dev = real_dev;
3221
3222 if (data && data[IFLA_MACSEC_ICV_LEN])
3223 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3224 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3225
3226 rx_handler = rtnl_dereference(real_dev->rx_handler);
3227 if (rx_handler && rx_handler != macsec_handle_frame)
3228 return -EBUSY;
3229
3230 err = register_netdevice(dev);
3231 if (err < 0)
3232 return err;
3233
3234 dev_hold(real_dev);
3235
3236 macsec->nest_level = dev_get_nest_level(real_dev) + 1;
3237 netdev_lockdep_set_classes(dev);
3238 lockdep_set_class_and_subclass(&dev->addr_list_lock,
3239 &macsec_netdev_addr_lock_key,
3240 macsec_get_nest_level(dev));
3241
3242 err = netdev_upper_dev_link(real_dev, dev);
3243 if (err < 0)
3244 goto unregister;
3245
3246 /* need to be already registered so that ->init has run and
3247 * the MAC addr is set
3248 */
3249 if (data && data[IFLA_MACSEC_SCI])
3250 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3251 else if (data && data[IFLA_MACSEC_PORT])
3252 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3253 else
3254 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3255
3256 if (rx_handler && sci_exists(real_dev, sci)) {
3257 err = -EBUSY;
3258 goto unlink;
3259 }
3260
3261 err = macsec_add_dev(dev, sci, icv_len);
3262 if (err)
3263 goto unlink;
3264
3265 if (data)
3266 macsec_changelink_common(dev, data);
3267
3268 err = register_macsec_dev(real_dev, dev);
3269 if (err < 0)
3270 goto del_dev;
3271
3272 macsec_generation++;
3273
3274 return 0;
3275
3276 del_dev:
3277 macsec_del_dev(macsec);
3278 unlink:
3279 netdev_upper_dev_unlink(real_dev, dev);
3280 unregister:
3281 unregister_netdevice(dev);
3282 return err;
3283 }
3284
3285 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
3286 {
3287 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3288 u8 icv_len = DEFAULT_ICV_LEN;
3289 int flag;
3290 bool es, scb, sci;
3291
3292 if (!data)
3293 return 0;
3294
3295 if (data[IFLA_MACSEC_CIPHER_SUITE])
3296 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3297
3298 if (data[IFLA_MACSEC_ICV_LEN]) {
3299 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3300 if (icv_len != DEFAULT_ICV_LEN) {
3301 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
3302 struct crypto_aead *dummy_tfm;
3303
3304 dummy_tfm = macsec_alloc_tfm(dummy_key,
3305 DEFAULT_SAK_LEN,
3306 icv_len);
3307 if (IS_ERR(dummy_tfm))
3308 return PTR_ERR(dummy_tfm);
3309 crypto_free_aead(dummy_tfm);
3310 }
3311 }
3312
3313 switch (csid) {
3314 case MACSEC_DEFAULT_CIPHER_ID:
3315 case MACSEC_DEFAULT_CIPHER_ALT:
3316 if (icv_len < MACSEC_MIN_ICV_LEN ||
3317 icv_len > MACSEC_STD_ICV_LEN)
3318 return -EINVAL;
3319 break;
3320 default:
3321 return -EINVAL;
3322 }
3323
3324 if (data[IFLA_MACSEC_ENCODING_SA]) {
3325 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3326 return -EINVAL;
3327 }
3328
3329 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3330 flag < IFLA_MACSEC_VALIDATION;
3331 flag++) {
3332 if (data[flag]) {
3333 if (nla_get_u8(data[flag]) > 1)
3334 return -EINVAL;
3335 }
3336 }
3337
3338 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3339 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3340 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3341
3342 if ((sci && (scb || es)) || (scb && es))
3343 return -EINVAL;
3344
3345 if (data[IFLA_MACSEC_VALIDATION] &&
3346 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3347 return -EINVAL;
3348
3349 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3350 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3351 !data[IFLA_MACSEC_WINDOW])
3352 return -EINVAL;
3353
3354 return 0;
3355 }
3356
3357 static struct net *macsec_get_link_net(const struct net_device *dev)
3358 {
3359 return dev_net(macsec_priv(dev)->real_dev);
3360 }
3361
3362 static size_t macsec_get_size(const struct net_device *dev)
3363 {
3364 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
3365 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
3366 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
3367 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
3368 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
3369 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
3370 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
3371 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
3372 nla_total_size(1) + /* IFLA_MACSEC_ES */
3373 nla_total_size(1) + /* IFLA_MACSEC_SCB */
3374 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
3375 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
3376 0;
3377 }
3378
3379 static int macsec_fill_info(struct sk_buff *skb,
3380 const struct net_device *dev)
3381 {
3382 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3383 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3384
3385 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
3386 IFLA_MACSEC_PAD) ||
3387 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3388 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
3389 MACSEC_DEFAULT_CIPHER_ID, IFLA_MACSEC_PAD) ||
3390 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3391 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3392 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3393 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3394 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3395 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3396 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3397 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3398 0)
3399 goto nla_put_failure;
3400
3401 if (secy->replay_protect) {
3402 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3403 goto nla_put_failure;
3404 }
3405
3406 return 0;
3407
3408 nla_put_failure:
3409 return -EMSGSIZE;
3410 }
3411
3412 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3413 .kind = "macsec",
3414 .priv_size = sizeof(struct macsec_dev),
3415 .maxtype = IFLA_MACSEC_MAX,
3416 .policy = macsec_rtnl_policy,
3417 .setup = macsec_setup,
3418 .validate = macsec_validate_attr,
3419 .newlink = macsec_newlink,
3420 .changelink = macsec_changelink,
3421 .dellink = macsec_dellink,
3422 .get_size = macsec_get_size,
3423 .fill_info = macsec_fill_info,
3424 .get_link_net = macsec_get_link_net,
3425 };
3426
3427 static bool is_macsec_master(struct net_device *dev)
3428 {
3429 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3430 }
3431
3432 static int macsec_notify(struct notifier_block *this, unsigned long event,
3433 void *ptr)
3434 {
3435 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3436 LIST_HEAD(head);
3437
3438 if (!is_macsec_master(real_dev))
3439 return NOTIFY_DONE;
3440
3441 switch (event) {
3442 case NETDEV_UNREGISTER: {
3443 struct macsec_dev *m, *n;
3444 struct macsec_rxh_data *rxd;
3445
3446 rxd = macsec_data_rtnl(real_dev);
3447 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3448 macsec_common_dellink(m->secy.netdev, &head);
3449 }
3450
3451 netdev_rx_handler_unregister(real_dev);
3452 kfree(rxd);
3453
3454 unregister_netdevice_many(&head);
3455 break;
3456 }
3457 case NETDEV_CHANGEMTU: {
3458 struct macsec_dev *m;
3459 struct macsec_rxh_data *rxd;
3460
3461 rxd = macsec_data_rtnl(real_dev);
3462 list_for_each_entry(m, &rxd->secys, secys) {
3463 struct net_device *dev = m->secy.netdev;
3464 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3465 macsec_extra_len(true));
3466
3467 if (dev->mtu > mtu)
3468 dev_set_mtu(dev, mtu);
3469 }
3470 }
3471 }
3472
3473 return NOTIFY_OK;
3474 }
3475
3476 static struct notifier_block macsec_notifier = {
3477 .notifier_call = macsec_notify,
3478 };
3479
3480 static int __init macsec_init(void)
3481 {
3482 int err;
3483
3484 pr_info("MACsec IEEE 802.1AE\n");
3485 err = register_netdevice_notifier(&macsec_notifier);
3486 if (err)
3487 return err;
3488
3489 err = rtnl_link_register(&macsec_link_ops);
3490 if (err)
3491 goto notifier;
3492
3493 err = genl_register_family(&macsec_fam);
3494 if (err)
3495 goto rtnl;
3496
3497 return 0;
3498
3499 rtnl:
3500 rtnl_link_unregister(&macsec_link_ops);
3501 notifier:
3502 unregister_netdevice_notifier(&macsec_notifier);
3503 return err;
3504 }
3505
3506 static void __exit macsec_exit(void)
3507 {
3508 genl_unregister_family(&macsec_fam);
3509 rtnl_link_unregister(&macsec_link_ops);
3510 unregister_netdevice_notifier(&macsec_notifier);
3511 rcu_barrier();
3512 }
3513
3514 module_init(macsec_init);
3515 module_exit(macsec_exit);
3516
3517 MODULE_ALIAS_RTNL_LINK("macsec");
3518
3519 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3520 MODULE_LICENSE("GPL v2");
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