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