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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux/fpc-iii.git] / drivers / net / macsec.c
blobf83cf6696820cca338b02c4bfa49479a1108fa68
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
1436 static struct net_device *get_dev_from_nl(struct net *net,
1437 struct nlattr **attrs)
1438 {
1439 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1440 struct net_device *dev;
1441
1442 dev = __dev_get_by_index(net, ifindex);
1443 if (!dev)
1444 return ERR_PTR(-ENODEV);
1445
1446 if (!netif_is_macsec(dev))
1447 return ERR_PTR(-ENODEV);
1448
1449 return dev;
1450 }
1451
1452 static sci_t nla_get_sci(const struct nlattr *nla)
1453 {
1454 return (__force sci_t)nla_get_u64(nla);
1455 }
1456
1457 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1458 int padattr)
1459 {
1460 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1461 }
1462
1463 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1464 struct nlattr **attrs,
1465 struct nlattr **tb_sa,
1466 struct net_device **devp,
1467 struct macsec_secy **secyp,
1468 struct macsec_tx_sc **scp,
1469 u8 *assoc_num)
1470 {
1471 struct net_device *dev;
1472 struct macsec_secy *secy;
1473 struct macsec_tx_sc *tx_sc;
1474 struct macsec_tx_sa *tx_sa;
1475
1476 if (!tb_sa[MACSEC_SA_ATTR_AN])
1477 return ERR_PTR(-EINVAL);
1478
1479 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1480
1481 dev = get_dev_from_nl(net, attrs);
1482 if (IS_ERR(dev))
1483 return ERR_CAST(dev);
1484
1485 if (*assoc_num >= MACSEC_NUM_AN)
1486 return ERR_PTR(-EINVAL);
1487
1488 secy = &macsec_priv(dev)->secy;
1489 tx_sc = &secy->tx_sc;
1490
1491 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1492 if (!tx_sa)
1493 return ERR_PTR(-ENODEV);
1494
1495 *devp = dev;
1496 *scp = tx_sc;
1497 *secyp = secy;
1498 return tx_sa;
1499 }
1500
1501 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1502 struct nlattr **attrs,
1503 struct nlattr **tb_rxsc,
1504 struct net_device **devp,
1505 struct macsec_secy **secyp)
1506 {
1507 struct net_device *dev;
1508 struct macsec_secy *secy;
1509 struct macsec_rx_sc *rx_sc;
1510 sci_t sci;
1511
1512 dev = get_dev_from_nl(net, attrs);
1513 if (IS_ERR(dev))
1514 return ERR_CAST(dev);
1515
1516 secy = &macsec_priv(dev)->secy;
1517
1518 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1519 return ERR_PTR(-EINVAL);
1520
1521 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1522 rx_sc = find_rx_sc_rtnl(secy, sci);
1523 if (!rx_sc)
1524 return ERR_PTR(-ENODEV);
1525
1526 *secyp = secy;
1527 *devp = dev;
1528
1529 return rx_sc;
1530 }
1531
1532 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1533 struct nlattr **attrs,
1534 struct nlattr **tb_rxsc,
1535 struct nlattr **tb_sa,
1536 struct net_device **devp,
1537 struct macsec_secy **secyp,
1538 struct macsec_rx_sc **scp,
1539 u8 *assoc_num)
1540 {
1541 struct macsec_rx_sc *rx_sc;
1542 struct macsec_rx_sa *rx_sa;
1543
1544 if (!tb_sa[MACSEC_SA_ATTR_AN])
1545 return ERR_PTR(-EINVAL);
1546
1547 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1548 if (*assoc_num >= MACSEC_NUM_AN)
1549 return ERR_PTR(-EINVAL);
1550
1551 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1552 if (IS_ERR(rx_sc))
1553 return ERR_CAST(rx_sc);
1554
1555 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1556 if (!rx_sa)
1557 return ERR_PTR(-ENODEV);
1558
1559 *scp = rx_sc;
1560 return rx_sa;
1561 }
1562
1563
1564 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1565 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1566 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1567 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1568 };
1569
1570 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1571 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1572 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1573 };
1574
1575 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1576 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1577 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1578 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1579 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1580 .len = MACSEC_KEYID_LEN, },
1581 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1582 .len = MACSEC_MAX_KEY_LEN, },
1583 };
1584
1585 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1586 {
1587 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1588 return -EINVAL;
1589
1590 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG],
1591 macsec_genl_sa_policy))
1592 return -EINVAL;
1593
1594 return 0;
1595 }
1596
1597 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1598 {
1599 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1600 return -EINVAL;
1601
1602 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG],
1603 macsec_genl_rxsc_policy))
1604 return -EINVAL;
1605
1606 return 0;
1607 }
1608
1609 static bool validate_add_rxsa(struct nlattr **attrs)
1610 {
1611 if (!attrs[MACSEC_SA_ATTR_AN] ||
1612 !attrs[MACSEC_SA_ATTR_KEY] ||
1613 !attrs[MACSEC_SA_ATTR_KEYID])
1614 return false;
1615
1616 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1617 return false;
1618
1619 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1620 return false;
1621
1622 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1623 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1624 return false;
1625 }
1626
1627 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1628 return false;
1629
1630 return true;
1631 }
1632
1633 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1634 {
1635 struct net_device *dev;
1636 struct nlattr **attrs = info->attrs;
1637 struct macsec_secy *secy;
1638 struct macsec_rx_sc *rx_sc;
1639 struct macsec_rx_sa *rx_sa;
1640 unsigned char assoc_num;
1641 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1642 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1643 int err;
1644
1645 if (!attrs[MACSEC_ATTR_IFINDEX])
1646 return -EINVAL;
1647
1648 if (parse_sa_config(attrs, tb_sa))
1649 return -EINVAL;
1650
1651 if (parse_rxsc_config(attrs, tb_rxsc))
1652 return -EINVAL;
1653
1654 if (!validate_add_rxsa(tb_sa))
1655 return -EINVAL;
1656
1657 rtnl_lock();
1658 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1659 if (IS_ERR(rx_sc)) {
1660 rtnl_unlock();
1661 return PTR_ERR(rx_sc);
1662 }
1663
1664 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1665
1666 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1667 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1668 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1669 rtnl_unlock();
1670 return -EINVAL;
1671 }
1672
1673 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1674 if (rx_sa) {
1675 rtnl_unlock();
1676 return -EBUSY;
1677 }
1678
1679 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1680 if (!rx_sa) {
1681 rtnl_unlock();
1682 return -ENOMEM;
1683 }
1684
1685 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1686 secy->key_len, secy->icv_len);
1687 if (err < 0) {
1688 kfree(rx_sa);
1689 rtnl_unlock();
1690 return err;
1691 }
1692
1693 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1694 spin_lock_bh(&rx_sa->lock);
1695 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1696 spin_unlock_bh(&rx_sa->lock);
1697 }
1698
1699 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1700 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1701
1702 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1703 rx_sa->sc = rx_sc;
1704 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1705
1706 rtnl_unlock();
1707
1708 return 0;
1709 }
1710
1711 static bool validate_add_rxsc(struct nlattr **attrs)
1712 {
1713 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1714 return false;
1715
1716 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1717 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1718 return false;
1719 }
1720
1721 return true;
1722 }
1723
1724 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1725 {
1726 struct net_device *dev;
1727 sci_t sci = MACSEC_UNDEF_SCI;
1728 struct nlattr **attrs = info->attrs;
1729 struct macsec_rx_sc *rx_sc;
1730 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1731
1732 if (!attrs[MACSEC_ATTR_IFINDEX])
1733 return -EINVAL;
1734
1735 if (parse_rxsc_config(attrs, tb_rxsc))
1736 return -EINVAL;
1737
1738 if (!validate_add_rxsc(tb_rxsc))
1739 return -EINVAL;
1740
1741 rtnl_lock();
1742 dev = get_dev_from_nl(genl_info_net(info), attrs);
1743 if (IS_ERR(dev)) {
1744 rtnl_unlock();
1745 return PTR_ERR(dev);
1746 }
1747
1748 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1749
1750 rx_sc = create_rx_sc(dev, sci);
1751 if (IS_ERR(rx_sc)) {
1752 rtnl_unlock();
1753 return PTR_ERR(rx_sc);
1754 }
1755
1756 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1757 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1758
1759 rtnl_unlock();
1760
1761 return 0;
1762 }
1763
1764 static bool validate_add_txsa(struct nlattr **attrs)
1765 {
1766 if (!attrs[MACSEC_SA_ATTR_AN] ||
1767 !attrs[MACSEC_SA_ATTR_PN] ||
1768 !attrs[MACSEC_SA_ATTR_KEY] ||
1769 !attrs[MACSEC_SA_ATTR_KEYID])
1770 return false;
1771
1772 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1773 return false;
1774
1775 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1776 return false;
1777
1778 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1779 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1780 return false;
1781 }
1782
1783 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1784 return false;
1785
1786 return true;
1787 }
1788
1789 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1790 {
1791 struct net_device *dev;
1792 struct nlattr **attrs = info->attrs;
1793 struct macsec_secy *secy;
1794 struct macsec_tx_sc *tx_sc;
1795 struct macsec_tx_sa *tx_sa;
1796 unsigned char assoc_num;
1797 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1798 int err;
1799
1800 if (!attrs[MACSEC_ATTR_IFINDEX])
1801 return -EINVAL;
1802
1803 if (parse_sa_config(attrs, tb_sa))
1804 return -EINVAL;
1805
1806 if (!validate_add_txsa(tb_sa))
1807 return -EINVAL;
1808
1809 rtnl_lock();
1810 dev = get_dev_from_nl(genl_info_net(info), attrs);
1811 if (IS_ERR(dev)) {
1812 rtnl_unlock();
1813 return PTR_ERR(dev);
1814 }
1815
1816 secy = &macsec_priv(dev)->secy;
1817 tx_sc = &secy->tx_sc;
1818
1819 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1820
1821 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1822 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1823 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1824 rtnl_unlock();
1825 return -EINVAL;
1826 }
1827
1828 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1829 if (tx_sa) {
1830 rtnl_unlock();
1831 return -EBUSY;
1832 }
1833
1834 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1835 if (!tx_sa) {
1836 rtnl_unlock();
1837 return -ENOMEM;
1838 }
1839
1840 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1841 secy->key_len, secy->icv_len);
1842 if (err < 0) {
1843 kfree(tx_sa);
1844 rtnl_unlock();
1845 return err;
1846 }
1847
1848 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1849
1850 spin_lock_bh(&tx_sa->lock);
1851 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1852 spin_unlock_bh(&tx_sa->lock);
1853
1854 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1855 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1856
1857 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1858 secy->operational = true;
1859
1860 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1861
1862 rtnl_unlock();
1863
1864 return 0;
1865 }
1866
1867 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1868 {
1869 struct nlattr **attrs = info->attrs;
1870 struct net_device *dev;
1871 struct macsec_secy *secy;
1872 struct macsec_rx_sc *rx_sc;
1873 struct macsec_rx_sa *rx_sa;
1874 u8 assoc_num;
1875 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1876 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1877
1878 if (!attrs[MACSEC_ATTR_IFINDEX])
1879 return -EINVAL;
1880
1881 if (parse_sa_config(attrs, tb_sa))
1882 return -EINVAL;
1883
1884 if (parse_rxsc_config(attrs, tb_rxsc))
1885 return -EINVAL;
1886
1887 rtnl_lock();
1888 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1889 &dev, &secy, &rx_sc, &assoc_num);
1890 if (IS_ERR(rx_sa)) {
1891 rtnl_unlock();
1892 return PTR_ERR(rx_sa);
1893 }
1894
1895 if (rx_sa->active) {
1896 rtnl_unlock();
1897 return -EBUSY;
1898 }
1899
1900 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1901 clear_rx_sa(rx_sa);
1902
1903 rtnl_unlock();
1904
1905 return 0;
1906 }
1907
1908 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1909 {
1910 struct nlattr **attrs = info->attrs;
1911 struct net_device *dev;
1912 struct macsec_secy *secy;
1913 struct macsec_rx_sc *rx_sc;
1914 sci_t sci;
1915 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1916
1917 if (!attrs[MACSEC_ATTR_IFINDEX])
1918 return -EINVAL;
1919
1920 if (parse_rxsc_config(attrs, tb_rxsc))
1921 return -EINVAL;
1922
1923 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1924 return -EINVAL;
1925
1926 rtnl_lock();
1927 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1928 if (IS_ERR(dev)) {
1929 rtnl_unlock();
1930 return PTR_ERR(dev);
1931 }
1932
1933 secy = &macsec_priv(dev)->secy;
1934 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1935
1936 rx_sc = del_rx_sc(secy, sci);
1937 if (!rx_sc) {
1938 rtnl_unlock();
1939 return -ENODEV;
1940 }
1941
1942 free_rx_sc(rx_sc);
1943 rtnl_unlock();
1944
1945 return 0;
1946 }
1947
1948 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1949 {
1950 struct nlattr **attrs = info->attrs;
1951 struct net_device *dev;
1952 struct macsec_secy *secy;
1953 struct macsec_tx_sc *tx_sc;
1954 struct macsec_tx_sa *tx_sa;
1955 u8 assoc_num;
1956 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1957
1958 if (!attrs[MACSEC_ATTR_IFINDEX])
1959 return -EINVAL;
1960
1961 if (parse_sa_config(attrs, tb_sa))
1962 return -EINVAL;
1963
1964 rtnl_lock();
1965 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1966 &dev, &secy, &tx_sc, &assoc_num);
1967 if (IS_ERR(tx_sa)) {
1968 rtnl_unlock();
1969 return PTR_ERR(tx_sa);
1970 }
1971
1972 if (tx_sa->active) {
1973 rtnl_unlock();
1974 return -EBUSY;
1975 }
1976
1977 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
1978 clear_tx_sa(tx_sa);
1979
1980 rtnl_unlock();
1981
1982 return 0;
1983 }
1984
1985 static bool validate_upd_sa(struct nlattr **attrs)
1986 {
1987 if (!attrs[MACSEC_SA_ATTR_AN] ||
1988 attrs[MACSEC_SA_ATTR_KEY] ||
1989 attrs[MACSEC_SA_ATTR_KEYID])
1990 return false;
1991
1992 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1993 return false;
1994
1995 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1996 return false;
1997
1998 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1999 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2000 return false;
2001 }
2002
2003 return true;
2004 }
2005
2006 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2007 {
2008 struct nlattr **attrs = info->attrs;
2009 struct net_device *dev;
2010 struct macsec_secy *secy;
2011 struct macsec_tx_sc *tx_sc;
2012 struct macsec_tx_sa *tx_sa;
2013 u8 assoc_num;
2014 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2015
2016 if (!attrs[MACSEC_ATTR_IFINDEX])
2017 return -EINVAL;
2018
2019 if (parse_sa_config(attrs, tb_sa))
2020 return -EINVAL;
2021
2022 if (!validate_upd_sa(tb_sa))
2023 return -EINVAL;
2024
2025 rtnl_lock();
2026 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2027 &dev, &secy, &tx_sc, &assoc_num);
2028 if (IS_ERR(tx_sa)) {
2029 rtnl_unlock();
2030 return PTR_ERR(tx_sa);
2031 }
2032
2033 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2034 spin_lock_bh(&tx_sa->lock);
2035 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2036 spin_unlock_bh(&tx_sa->lock);
2037 }
2038
2039 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2040 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2041
2042 if (assoc_num == tx_sc->encoding_sa)
2043 secy->operational = tx_sa->active;
2044
2045 rtnl_unlock();
2046
2047 return 0;
2048 }
2049
2050 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2051 {
2052 struct nlattr **attrs = info->attrs;
2053 struct net_device *dev;
2054 struct macsec_secy *secy;
2055 struct macsec_rx_sc *rx_sc;
2056 struct macsec_rx_sa *rx_sa;
2057 u8 assoc_num;
2058 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2059 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2060
2061 if (!attrs[MACSEC_ATTR_IFINDEX])
2062 return -EINVAL;
2063
2064 if (parse_rxsc_config(attrs, tb_rxsc))
2065 return -EINVAL;
2066
2067 if (parse_sa_config(attrs, tb_sa))
2068 return -EINVAL;
2069
2070 if (!validate_upd_sa(tb_sa))
2071 return -EINVAL;
2072
2073 rtnl_lock();
2074 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2075 &dev, &secy, &rx_sc, &assoc_num);
2076 if (IS_ERR(rx_sa)) {
2077 rtnl_unlock();
2078 return PTR_ERR(rx_sa);
2079 }
2080
2081 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2082 spin_lock_bh(&rx_sa->lock);
2083 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2084 spin_unlock_bh(&rx_sa->lock);
2085 }
2086
2087 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2088 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2089
2090 rtnl_unlock();
2091 return 0;
2092 }
2093
2094 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2095 {
2096 struct nlattr **attrs = info->attrs;
2097 struct net_device *dev;
2098 struct macsec_secy *secy;
2099 struct macsec_rx_sc *rx_sc;
2100 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2101
2102 if (!attrs[MACSEC_ATTR_IFINDEX])
2103 return -EINVAL;
2104
2105 if (parse_rxsc_config(attrs, tb_rxsc))
2106 return -EINVAL;
2107
2108 if (!validate_add_rxsc(tb_rxsc))
2109 return -EINVAL;
2110
2111 rtnl_lock();
2112 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2113 if (IS_ERR(rx_sc)) {
2114 rtnl_unlock();
2115 return PTR_ERR(rx_sc);
2116 }
2117
2118 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2119 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2120
2121 if (rx_sc->active != new)
2122 secy->n_rx_sc += new ? 1 : -1;
2123
2124 rx_sc->active = new;
2125 }
2126
2127 rtnl_unlock();
2128
2129 return 0;
2130 }
2131
2132 static int copy_tx_sa_stats(struct sk_buff *skb,
2133 struct macsec_tx_sa_stats __percpu *pstats)
2134 {
2135 struct macsec_tx_sa_stats sum = {0, };
2136 int cpu;
2137
2138 for_each_possible_cpu(cpu) {
2139 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2140
2141 sum.OutPktsProtected += stats->OutPktsProtected;
2142 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2143 }
2144
2145 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2146 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2147 return -EMSGSIZE;
2148
2149 return 0;
2150 }
2151
2152 static int copy_rx_sa_stats(struct sk_buff *skb,
2153 struct macsec_rx_sa_stats __percpu *pstats)
2154 {
2155 struct macsec_rx_sa_stats sum = {0, };
2156 int cpu;
2157
2158 for_each_possible_cpu(cpu) {
2159 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2160
2161 sum.InPktsOK += stats->InPktsOK;
2162 sum.InPktsInvalid += stats->InPktsInvalid;
2163 sum.InPktsNotValid += stats->InPktsNotValid;
2164 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2165 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2166 }
2167
2168 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2169 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2170 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2171 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2172 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2173 return -EMSGSIZE;
2174
2175 return 0;
2176 }
2177
2178 static int copy_rx_sc_stats(struct sk_buff *skb,
2179 struct pcpu_rx_sc_stats __percpu *pstats)
2180 {
2181 struct macsec_rx_sc_stats sum = {0, };
2182 int cpu;
2183
2184 for_each_possible_cpu(cpu) {
2185 const struct pcpu_rx_sc_stats *stats;
2186 struct macsec_rx_sc_stats tmp;
2187 unsigned int start;
2188
2189 stats = per_cpu_ptr(pstats, cpu);
2190 do {
2191 start = u64_stats_fetch_begin_irq(&stats->syncp);
2192 memcpy(&tmp, &stats->stats, sizeof(tmp));
2193 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2194
2195 sum.InOctetsValidated += tmp.InOctetsValidated;
2196 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2197 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2198 sum.InPktsDelayed += tmp.InPktsDelayed;
2199 sum.InPktsOK += tmp.InPktsOK;
2200 sum.InPktsInvalid += tmp.InPktsInvalid;
2201 sum.InPktsLate += tmp.InPktsLate;
2202 sum.InPktsNotValid += tmp.InPktsNotValid;
2203 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2204 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2205 }
2206
2207 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2208 sum.InOctetsValidated,
2209 MACSEC_RXSC_STATS_ATTR_PAD) ||
2210 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2211 sum.InOctetsDecrypted,
2212 MACSEC_RXSC_STATS_ATTR_PAD) ||
2213 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2214 sum.InPktsUnchecked,
2215 MACSEC_RXSC_STATS_ATTR_PAD) ||
2216 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2217 sum.InPktsDelayed,
2218 MACSEC_RXSC_STATS_ATTR_PAD) ||
2219 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2220 sum.InPktsOK,
2221 MACSEC_RXSC_STATS_ATTR_PAD) ||
2222 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2223 sum.InPktsInvalid,
2224 MACSEC_RXSC_STATS_ATTR_PAD) ||
2225 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2226 sum.InPktsLate,
2227 MACSEC_RXSC_STATS_ATTR_PAD) ||
2228 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2229 sum.InPktsNotValid,
2230 MACSEC_RXSC_STATS_ATTR_PAD) ||
2231 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2232 sum.InPktsNotUsingSA,
2233 MACSEC_RXSC_STATS_ATTR_PAD) ||
2234 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2235 sum.InPktsUnusedSA,
2236 MACSEC_RXSC_STATS_ATTR_PAD))
2237 return -EMSGSIZE;
2238
2239 return 0;
2240 }
2241
2242 static int copy_tx_sc_stats(struct sk_buff *skb,
2243 struct pcpu_tx_sc_stats __percpu *pstats)
2244 {
2245 struct macsec_tx_sc_stats sum = {0, };
2246 int cpu;
2247
2248 for_each_possible_cpu(cpu) {
2249 const struct pcpu_tx_sc_stats *stats;
2250 struct macsec_tx_sc_stats tmp;
2251 unsigned int start;
2252
2253 stats = per_cpu_ptr(pstats, cpu);
2254 do {
2255 start = u64_stats_fetch_begin_irq(&stats->syncp);
2256 memcpy(&tmp, &stats->stats, sizeof(tmp));
2257 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2258
2259 sum.OutPktsProtected += tmp.OutPktsProtected;
2260 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2261 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2262 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2263 }
2264
2265 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2266 sum.OutPktsProtected,
2267 MACSEC_TXSC_STATS_ATTR_PAD) ||
2268 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2269 sum.OutPktsEncrypted,
2270 MACSEC_TXSC_STATS_ATTR_PAD) ||
2271 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2272 sum.OutOctetsProtected,
2273 MACSEC_TXSC_STATS_ATTR_PAD) ||
2274 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2275 sum.OutOctetsEncrypted,
2276 MACSEC_TXSC_STATS_ATTR_PAD))
2277 return -EMSGSIZE;
2278
2279 return 0;
2280 }
2281
2282 static int copy_secy_stats(struct sk_buff *skb,
2283 struct pcpu_secy_stats __percpu *pstats)
2284 {
2285 struct macsec_dev_stats sum = {0, };
2286 int cpu;
2287
2288 for_each_possible_cpu(cpu) {
2289 const struct pcpu_secy_stats *stats;
2290 struct macsec_dev_stats tmp;
2291 unsigned int start;
2292
2293 stats = per_cpu_ptr(pstats, cpu);
2294 do {
2295 start = u64_stats_fetch_begin_irq(&stats->syncp);
2296 memcpy(&tmp, &stats->stats, sizeof(tmp));
2297 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2298
2299 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2300 sum.InPktsUntagged += tmp.InPktsUntagged;
2301 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2302 sum.InPktsNoTag += tmp.InPktsNoTag;
2303 sum.InPktsBadTag += tmp.InPktsBadTag;
2304 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2305 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2306 sum.InPktsOverrun += tmp.InPktsOverrun;
2307 }
2308
2309 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2310 sum.OutPktsUntagged,
2311 MACSEC_SECY_STATS_ATTR_PAD) ||
2312 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2313 sum.InPktsUntagged,
2314 MACSEC_SECY_STATS_ATTR_PAD) ||
2315 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2316 sum.OutPktsTooLong,
2317 MACSEC_SECY_STATS_ATTR_PAD) ||
2318 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2319 sum.InPktsNoTag,
2320 MACSEC_SECY_STATS_ATTR_PAD) ||
2321 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2322 sum.InPktsBadTag,
2323 MACSEC_SECY_STATS_ATTR_PAD) ||
2324 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2325 sum.InPktsUnknownSCI,
2326 MACSEC_SECY_STATS_ATTR_PAD) ||
2327 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2328 sum.InPktsNoSCI,
2329 MACSEC_SECY_STATS_ATTR_PAD) ||
2330 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2331 sum.InPktsOverrun,
2332 MACSEC_SECY_STATS_ATTR_PAD))
2333 return -EMSGSIZE;
2334
2335 return 0;
2336 }
2337
2338 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2339 {
2340 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2341 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2342
2343 if (!secy_nest)
2344 return 1;
2345
2346 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2347 MACSEC_SECY_ATTR_PAD) ||
2348 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2349 MACSEC_DEFAULT_CIPHER_ID,
2350 MACSEC_SECY_ATTR_PAD) ||
2351 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2352 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2353 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2354 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2355 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2356 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2357 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2358 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2359 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2360 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2361 goto cancel;
2362
2363 if (secy->replay_protect) {
2364 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2365 goto cancel;
2366 }
2367
2368 nla_nest_end(skb, secy_nest);
2369 return 0;
2370
2371 cancel:
2372 nla_nest_cancel(skb, secy_nest);
2373 return 1;
2374 }
2375
2376 static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2377 struct sk_buff *skb, struct netlink_callback *cb)
2378 {
2379 struct macsec_rx_sc *rx_sc;
2380 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2381 struct nlattr *txsa_list, *rxsc_list;
2382 int i, j;
2383 void *hdr;
2384 struct nlattr *attr;
2385
2386 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2387 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2388 if (!hdr)
2389 return -EMSGSIZE;
2390
2391 genl_dump_check_consistent(cb, hdr, &macsec_fam);
2392
2393 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2394 goto nla_put_failure;
2395
2396 if (nla_put_secy(secy, skb))
2397 goto nla_put_failure;
2398
2399 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2400 if (!attr)
2401 goto nla_put_failure;
2402 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2403 nla_nest_cancel(skb, attr);
2404 goto nla_put_failure;
2405 }
2406 nla_nest_end(skb, attr);
2407
2408 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2409 if (!attr)
2410 goto nla_put_failure;
2411 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2412 nla_nest_cancel(skb, attr);
2413 goto nla_put_failure;
2414 }
2415 nla_nest_end(skb, attr);
2416
2417 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2418 if (!txsa_list)
2419 goto nla_put_failure;
2420 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2421 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2422 struct nlattr *txsa_nest;
2423
2424 if (!tx_sa)
2425 continue;
2426
2427 txsa_nest = nla_nest_start(skb, j++);
2428 if (!txsa_nest) {
2429 nla_nest_cancel(skb, txsa_list);
2430 goto nla_put_failure;
2431 }
2432
2433 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2434 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2435 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2436 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2437 nla_nest_cancel(skb, txsa_nest);
2438 nla_nest_cancel(skb, txsa_list);
2439 goto nla_put_failure;
2440 }
2441
2442 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2443 if (!attr) {
2444 nla_nest_cancel(skb, txsa_nest);
2445 nla_nest_cancel(skb, txsa_list);
2446 goto nla_put_failure;
2447 }
2448 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2449 nla_nest_cancel(skb, attr);
2450 nla_nest_cancel(skb, txsa_nest);
2451 nla_nest_cancel(skb, txsa_list);
2452 goto nla_put_failure;
2453 }
2454 nla_nest_end(skb, attr);
2455
2456 nla_nest_end(skb, txsa_nest);
2457 }
2458 nla_nest_end(skb, txsa_list);
2459
2460 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2461 if (!rxsc_list)
2462 goto nla_put_failure;
2463
2464 j = 1;
2465 for_each_rxsc_rtnl(secy, rx_sc) {
2466 int k;
2467 struct nlattr *rxsa_list;
2468 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2469
2470 if (!rxsc_nest) {
2471 nla_nest_cancel(skb, rxsc_list);
2472 goto nla_put_failure;
2473 }
2474
2475 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2476 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
2477 MACSEC_RXSC_ATTR_PAD)) {
2478 nla_nest_cancel(skb, rxsc_nest);
2479 nla_nest_cancel(skb, rxsc_list);
2480 goto nla_put_failure;
2481 }
2482
2483 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2484 if (!attr) {
2485 nla_nest_cancel(skb, rxsc_nest);
2486 nla_nest_cancel(skb, rxsc_list);
2487 goto nla_put_failure;
2488 }
2489 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2490 nla_nest_cancel(skb, attr);
2491 nla_nest_cancel(skb, rxsc_nest);
2492 nla_nest_cancel(skb, rxsc_list);
2493 goto nla_put_failure;
2494 }
2495 nla_nest_end(skb, attr);
2496
2497 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2498 if (!rxsa_list) {
2499 nla_nest_cancel(skb, rxsc_nest);
2500 nla_nest_cancel(skb, rxsc_list);
2501 goto nla_put_failure;
2502 }
2503
2504 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2505 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2506 struct nlattr *rxsa_nest;
2507
2508 if (!rx_sa)
2509 continue;
2510
2511 rxsa_nest = nla_nest_start(skb, k++);
2512 if (!rxsa_nest) {
2513 nla_nest_cancel(skb, rxsa_list);
2514 nla_nest_cancel(skb, rxsc_nest);
2515 nla_nest_cancel(skb, rxsc_list);
2516 goto nla_put_failure;
2517 }
2518
2519 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2520 if (!attr) {
2521 nla_nest_cancel(skb, rxsa_list);
2522 nla_nest_cancel(skb, rxsc_nest);
2523 nla_nest_cancel(skb, rxsc_list);
2524 goto nla_put_failure;
2525 }
2526 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2527 nla_nest_cancel(skb, 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 nla_nest_end(skb, attr);
2534
2535 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2536 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2537 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2538 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2539 nla_nest_cancel(skb, rxsa_nest);
2540 nla_nest_cancel(skb, rxsc_nest);
2541 nla_nest_cancel(skb, rxsc_list);
2542 goto nla_put_failure;
2543 }
2544 nla_nest_end(skb, rxsa_nest);
2545 }
2546
2547 nla_nest_end(skb, rxsa_list);
2548 nla_nest_end(skb, rxsc_nest);
2549 }
2550
2551 nla_nest_end(skb, rxsc_list);
2552
2553 genlmsg_end(skb, hdr);
2554
2555 return 0;
2556
2557 nla_put_failure:
2558 genlmsg_cancel(skb, hdr);
2559 return -EMSGSIZE;
2560 }
2561
2562 static int macsec_generation = 1; /* protected by RTNL */
2563
2564 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2565 {
2566 struct net *net = sock_net(skb->sk);
2567 struct net_device *dev;
2568 int dev_idx, d;
2569
2570 dev_idx = cb->args[0];
2571
2572 d = 0;
2573 rtnl_lock();
2574
2575 cb->seq = macsec_generation;
2576
2577 for_each_netdev(net, dev) {
2578 struct macsec_secy *secy;
2579
2580 if (d < dev_idx)
2581 goto next;
2582
2583 if (!netif_is_macsec(dev))
2584 goto next;
2585
2586 secy = &macsec_priv(dev)->secy;
2587 if (dump_secy(secy, dev, skb, cb) < 0)
2588 goto done;
2589 next:
2590 d++;
2591 }
2592
2593 done:
2594 rtnl_unlock();
2595 cb->args[0] = d;
2596 return skb->len;
2597 }
2598
2599 static const struct genl_ops macsec_genl_ops[] = {
2600 {
2601 .cmd = MACSEC_CMD_GET_TXSC,
2602 .dumpit = macsec_dump_txsc,
2603 .policy = macsec_genl_policy,
2604 },
2605 {
2606 .cmd = MACSEC_CMD_ADD_RXSC,
2607 .doit = macsec_add_rxsc,
2608 .policy = macsec_genl_policy,
2609 .flags = GENL_ADMIN_PERM,
2610 },
2611 {
2612 .cmd = MACSEC_CMD_DEL_RXSC,
2613 .doit = macsec_del_rxsc,
2614 .policy = macsec_genl_policy,
2615 .flags = GENL_ADMIN_PERM,
2616 },
2617 {
2618 .cmd = MACSEC_CMD_UPD_RXSC,
2619 .doit = macsec_upd_rxsc,
2620 .policy = macsec_genl_policy,
2621 .flags = GENL_ADMIN_PERM,
2622 },
2623 {
2624 .cmd = MACSEC_CMD_ADD_TXSA,
2625 .doit = macsec_add_txsa,
2626 .policy = macsec_genl_policy,
2627 .flags = GENL_ADMIN_PERM,
2628 },
2629 {
2630 .cmd = MACSEC_CMD_DEL_TXSA,
2631 .doit = macsec_del_txsa,
2632 .policy = macsec_genl_policy,
2633 .flags = GENL_ADMIN_PERM,
2634 },
2635 {
2636 .cmd = MACSEC_CMD_UPD_TXSA,
2637 .doit = macsec_upd_txsa,
2638 .policy = macsec_genl_policy,
2639 .flags = GENL_ADMIN_PERM,
2640 },
2641 {
2642 .cmd = MACSEC_CMD_ADD_RXSA,
2643 .doit = macsec_add_rxsa,
2644 .policy = macsec_genl_policy,
2645 .flags = GENL_ADMIN_PERM,
2646 },
2647 {
2648 .cmd = MACSEC_CMD_DEL_RXSA,
2649 .doit = macsec_del_rxsa,
2650 .policy = macsec_genl_policy,
2651 .flags = GENL_ADMIN_PERM,
2652 },
2653 {
2654 .cmd = MACSEC_CMD_UPD_RXSA,
2655 .doit = macsec_upd_rxsa,
2656 .policy = macsec_genl_policy,
2657 .flags = GENL_ADMIN_PERM,
2658 },
2659 };
2660
2661 static struct genl_family macsec_fam __ro_after_init = {
2662 .name = MACSEC_GENL_NAME,
2663 .hdrsize = 0,
2664 .version = MACSEC_GENL_VERSION,
2665 .maxattr = MACSEC_ATTR_MAX,
2666 .netnsok = true,
2667 .module = THIS_MODULE,
2668 .ops = macsec_genl_ops,
2669 .n_ops = ARRAY_SIZE(macsec_genl_ops),
2670 };
2671
2672 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2673 struct net_device *dev)
2674 {
2675 struct macsec_dev *macsec = netdev_priv(dev);
2676 struct macsec_secy *secy = &macsec->secy;
2677 struct pcpu_secy_stats *secy_stats;
2678 int ret, len;
2679
2680 /* 10.5 */
2681 if (!secy->protect_frames) {
2682 secy_stats = this_cpu_ptr(macsec->stats);
2683 u64_stats_update_begin(&secy_stats->syncp);
2684 secy_stats->stats.OutPktsUntagged++;
2685 u64_stats_update_end(&secy_stats->syncp);
2686 skb->dev = macsec->real_dev;
2687 len = skb->len;
2688 ret = dev_queue_xmit(skb);
2689 count_tx(dev, ret, len);
2690 return ret;
2691 }
2692
2693 if (!secy->operational) {
2694 kfree_skb(skb);
2695 dev->stats.tx_dropped++;
2696 return NETDEV_TX_OK;
2697 }
2698
2699 skb = macsec_encrypt(skb, dev);
2700 if (IS_ERR(skb)) {
2701 if (PTR_ERR(skb) != -EINPROGRESS)
2702 dev->stats.tx_dropped++;
2703 return NETDEV_TX_OK;
2704 }
2705
2706 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2707
2708 macsec_encrypt_finish(skb, dev);
2709 len = skb->len;
2710 ret = dev_queue_xmit(skb);
2711 count_tx(dev, ret, len);
2712 return ret;
2713 }
2714
2715 #define MACSEC_FEATURES \
2716 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2717 static struct lock_class_key macsec_netdev_addr_lock_key;
2718
2719 static int macsec_dev_init(struct net_device *dev)
2720 {
2721 struct macsec_dev *macsec = macsec_priv(dev);
2722 struct net_device *real_dev = macsec->real_dev;
2723 int err;
2724
2725 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2726 if (!dev->tstats)
2727 return -ENOMEM;
2728
2729 err = gro_cells_init(&macsec->gro_cells, dev);
2730 if (err) {
2731 free_percpu(dev->tstats);
2732 return err;
2733 }
2734
2735 dev->features = real_dev->features & MACSEC_FEATURES;
2736 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2737
2738 dev->needed_headroom = real_dev->needed_headroom +
2739 MACSEC_NEEDED_HEADROOM;
2740 dev->needed_tailroom = real_dev->needed_tailroom +
2741 MACSEC_NEEDED_TAILROOM;
2742
2743 if (is_zero_ether_addr(dev->dev_addr))
2744 eth_hw_addr_inherit(dev, real_dev);
2745 if (is_zero_ether_addr(dev->broadcast))
2746 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2747
2748 return 0;
2749 }
2750
2751 static void macsec_dev_uninit(struct net_device *dev)
2752 {
2753 struct macsec_dev *macsec = macsec_priv(dev);
2754
2755 gro_cells_destroy(&macsec->gro_cells);
2756 free_percpu(dev->tstats);
2757 }
2758
2759 static netdev_features_t macsec_fix_features(struct net_device *dev,
2760 netdev_features_t features)
2761 {
2762 struct macsec_dev *macsec = macsec_priv(dev);
2763 struct net_device *real_dev = macsec->real_dev;
2764
2765 features &= (real_dev->features & MACSEC_FEATURES) |
2766 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
2767 features |= NETIF_F_LLTX;
2768
2769 return features;
2770 }
2771
2772 static int macsec_dev_open(struct net_device *dev)
2773 {
2774 struct macsec_dev *macsec = macsec_priv(dev);
2775 struct net_device *real_dev = macsec->real_dev;
2776 int err;
2777
2778 if (!(real_dev->flags & IFF_UP))
2779 return -ENETDOWN;
2780
2781 err = dev_uc_add(real_dev, dev->dev_addr);
2782 if (err < 0)
2783 return err;
2784
2785 if (dev->flags & IFF_ALLMULTI) {
2786 err = dev_set_allmulti(real_dev, 1);
2787 if (err < 0)
2788 goto del_unicast;
2789 }
2790
2791 if (dev->flags & IFF_PROMISC) {
2792 err = dev_set_promiscuity(real_dev, 1);
2793 if (err < 0)
2794 goto clear_allmulti;
2795 }
2796
2797 if (netif_carrier_ok(real_dev))
2798 netif_carrier_on(dev);
2799
2800 return 0;
2801 clear_allmulti:
2802 if (dev->flags & IFF_ALLMULTI)
2803 dev_set_allmulti(real_dev, -1);
2804 del_unicast:
2805 dev_uc_del(real_dev, dev->dev_addr);
2806 netif_carrier_off(dev);
2807 return err;
2808 }
2809
2810 static int macsec_dev_stop(struct net_device *dev)
2811 {
2812 struct macsec_dev *macsec = macsec_priv(dev);
2813 struct net_device *real_dev = macsec->real_dev;
2814
2815 netif_carrier_off(dev);
2816
2817 dev_mc_unsync(real_dev, dev);
2818 dev_uc_unsync(real_dev, dev);
2819
2820 if (dev->flags & IFF_ALLMULTI)
2821 dev_set_allmulti(real_dev, -1);
2822
2823 if (dev->flags & IFF_PROMISC)
2824 dev_set_promiscuity(real_dev, -1);
2825
2826 dev_uc_del(real_dev, dev->dev_addr);
2827
2828 return 0;
2829 }
2830
2831 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2832 {
2833 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2834
2835 if (!(dev->flags & IFF_UP))
2836 return;
2837
2838 if (change & IFF_ALLMULTI)
2839 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2840
2841 if (change & IFF_PROMISC)
2842 dev_set_promiscuity(real_dev,
2843 dev->flags & IFF_PROMISC ? 1 : -1);
2844 }
2845
2846 static void macsec_dev_set_rx_mode(struct net_device *dev)
2847 {
2848 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2849
2850 dev_mc_sync(real_dev, dev);
2851 dev_uc_sync(real_dev, dev);
2852 }
2853
2854 static int macsec_set_mac_address(struct net_device *dev, void *p)
2855 {
2856 struct macsec_dev *macsec = macsec_priv(dev);
2857 struct net_device *real_dev = macsec->real_dev;
2858 struct sockaddr *addr = p;
2859 int err;
2860
2861 if (!is_valid_ether_addr(addr->sa_data))
2862 return -EADDRNOTAVAIL;
2863
2864 if (!(dev->flags & IFF_UP))
2865 goto out;
2866
2867 err = dev_uc_add(real_dev, addr->sa_data);
2868 if (err < 0)
2869 return err;
2870
2871 dev_uc_del(real_dev, dev->dev_addr);
2872
2873 out:
2874 ether_addr_copy(dev->dev_addr, addr->sa_data);
2875 return 0;
2876 }
2877
2878 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2879 {
2880 struct macsec_dev *macsec = macsec_priv(dev);
2881 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2882
2883 if (macsec->real_dev->mtu - extra < new_mtu)
2884 return -ERANGE;
2885
2886 dev->mtu = new_mtu;
2887
2888 return 0;
2889 }
2890
2891 static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev,
2892 struct rtnl_link_stats64 *s)
2893 {
2894 int cpu;
2895
2896 if (!dev->tstats)
2897 return s;
2898
2899 for_each_possible_cpu(cpu) {
2900 struct pcpu_sw_netstats *stats;
2901 struct pcpu_sw_netstats tmp;
2902 int start;
2903
2904 stats = per_cpu_ptr(dev->tstats, cpu);
2905 do {
2906 start = u64_stats_fetch_begin_irq(&stats->syncp);
2907 tmp.rx_packets = stats->rx_packets;
2908 tmp.rx_bytes = stats->rx_bytes;
2909 tmp.tx_packets = stats->tx_packets;
2910 tmp.tx_bytes = stats->tx_bytes;
2911 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2912
2913 s->rx_packets += tmp.rx_packets;
2914 s->rx_bytes += tmp.rx_bytes;
2915 s->tx_packets += tmp.tx_packets;
2916 s->tx_bytes += tmp.tx_bytes;
2917 }
2918
2919 s->rx_dropped = dev->stats.rx_dropped;
2920 s->tx_dropped = dev->stats.tx_dropped;
2921
2922 return s;
2923 }
2924
2925 static int macsec_get_iflink(const struct net_device *dev)
2926 {
2927 return macsec_priv(dev)->real_dev->ifindex;
2928 }
2929
2930
2931 static int macsec_get_nest_level(struct net_device *dev)
2932 {
2933 return macsec_priv(dev)->nest_level;
2934 }
2935
2936
2937 static const struct net_device_ops macsec_netdev_ops = {
2938 .ndo_init = macsec_dev_init,
2939 .ndo_uninit = macsec_dev_uninit,
2940 .ndo_open = macsec_dev_open,
2941 .ndo_stop = macsec_dev_stop,
2942 .ndo_fix_features = macsec_fix_features,
2943 .ndo_change_mtu = macsec_change_mtu,
2944 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2945 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2946 .ndo_set_mac_address = macsec_set_mac_address,
2947 .ndo_start_xmit = macsec_start_xmit,
2948 .ndo_get_stats64 = macsec_get_stats64,
2949 .ndo_get_iflink = macsec_get_iflink,
2950 .ndo_get_lock_subclass = macsec_get_nest_level,
2951 };
2952
2953 static const struct device_type macsec_type = {
2954 .name = "macsec",
2955 };
2956
2957 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2958 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2959 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2960 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2961 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2962 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2963 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2964 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
2965 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
2966 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
2967 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
2968 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
2969 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
2970 };
2971
2972 static void macsec_free_netdev(struct net_device *dev)
2973 {
2974 struct macsec_dev *macsec = macsec_priv(dev);
2975 struct net_device *real_dev = macsec->real_dev;
2976
2977 free_percpu(macsec->stats);
2978 free_percpu(macsec->secy.tx_sc.stats);
2979
2980 dev_put(real_dev);
2981 free_netdev(dev);
2982 }
2983
2984 static void macsec_setup(struct net_device *dev)
2985 {
2986 ether_setup(dev);
2987 dev->min_mtu = 0;
2988 dev->max_mtu = ETH_MAX_MTU;
2989 dev->priv_flags |= IFF_NO_QUEUE;
2990 dev->netdev_ops = &macsec_netdev_ops;
2991 dev->destructor = macsec_free_netdev;
2992 SET_NETDEV_DEVTYPE(dev, &macsec_type);
2993
2994 eth_zero_addr(dev->broadcast);
2995 }
2996
2997 static void macsec_changelink_common(struct net_device *dev,
2998 struct nlattr *data[])
2999 {
3000 struct macsec_secy *secy;
3001 struct macsec_tx_sc *tx_sc;
3002
3003 secy = &macsec_priv(dev)->secy;
3004 tx_sc = &secy->tx_sc;
3005
3006 if (data[IFLA_MACSEC_ENCODING_SA]) {
3007 struct macsec_tx_sa *tx_sa;
3008
3009 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3010 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3011
3012 secy->operational = tx_sa && tx_sa->active;
3013 }
3014
3015 if (data[IFLA_MACSEC_WINDOW])
3016 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3017
3018 if (data[IFLA_MACSEC_ENCRYPT])
3019 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3020
3021 if (data[IFLA_MACSEC_PROTECT])
3022 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3023
3024 if (data[IFLA_MACSEC_INC_SCI])
3025 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3026
3027 if (data[IFLA_MACSEC_ES])
3028 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3029
3030 if (data[IFLA_MACSEC_SCB])
3031 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3032
3033 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3034 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3035
3036 if (data[IFLA_MACSEC_VALIDATION])
3037 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3038 }
3039
3040 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3041 struct nlattr *data[])
3042 {
3043 if (!data)
3044 return 0;
3045
3046 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3047 data[IFLA_MACSEC_ICV_LEN] ||
3048 data[IFLA_MACSEC_SCI] ||
3049 data[IFLA_MACSEC_PORT])
3050 return -EINVAL;
3051
3052 macsec_changelink_common(dev, data);
3053
3054 return 0;
3055 }
3056
3057 static void macsec_del_dev(struct macsec_dev *macsec)
3058 {
3059 int i;
3060
3061 while (macsec->secy.rx_sc) {
3062 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3063
3064 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3065 free_rx_sc(rx_sc);
3066 }
3067
3068 for (i = 0; i < MACSEC_NUM_AN; i++) {
3069 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3070
3071 if (sa) {
3072 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3073 clear_tx_sa(sa);
3074 }
3075 }
3076 }
3077
3078 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3079 {
3080 struct macsec_dev *macsec = macsec_priv(dev);
3081 struct net_device *real_dev = macsec->real_dev;
3082
3083 unregister_netdevice_queue(dev, head);
3084 list_del_rcu(&macsec->secys);
3085 macsec_del_dev(macsec);
3086 netdev_upper_dev_unlink(real_dev, dev);
3087
3088 macsec_generation++;
3089 }
3090
3091 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3092 {
3093 struct macsec_dev *macsec = macsec_priv(dev);
3094 struct net_device *real_dev = macsec->real_dev;
3095 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3096
3097 macsec_common_dellink(dev, head);
3098
3099 if (list_empty(&rxd->secys)) {
3100 netdev_rx_handler_unregister(real_dev);
3101 kfree(rxd);
3102 }
3103 }
3104
3105 static int register_macsec_dev(struct net_device *real_dev,
3106 struct net_device *dev)
3107 {
3108 struct macsec_dev *macsec = macsec_priv(dev);
3109 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3110
3111 if (!rxd) {
3112 int err;
3113
3114 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3115 if (!rxd)
3116 return -ENOMEM;
3117
3118 INIT_LIST_HEAD(&rxd->secys);
3119
3120 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3121 rxd);
3122 if (err < 0) {
3123 kfree(rxd);
3124 return err;
3125 }
3126 }
3127
3128 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3129 return 0;
3130 }
3131
3132 static bool sci_exists(struct net_device *dev, sci_t sci)
3133 {
3134 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3135 struct macsec_dev *macsec;
3136
3137 list_for_each_entry(macsec, &rxd->secys, secys) {
3138 if (macsec->secy.sci == sci)
3139 return true;
3140 }
3141
3142 return false;
3143 }
3144
3145 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3146 {
3147 return make_sci(dev->dev_addr, port);
3148 }
3149
3150 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3151 {
3152 struct macsec_dev *macsec = macsec_priv(dev);
3153 struct macsec_secy *secy = &macsec->secy;
3154
3155 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3156 if (!macsec->stats)
3157 return -ENOMEM;
3158
3159 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3160 if (!secy->tx_sc.stats) {
3161 free_percpu(macsec->stats);
3162 return -ENOMEM;
3163 }
3164
3165 if (sci == MACSEC_UNDEF_SCI)
3166 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3167
3168 secy->netdev = dev;
3169 secy->operational = true;
3170 secy->key_len = DEFAULT_SAK_LEN;
3171 secy->icv_len = icv_len;
3172 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3173 secy->protect_frames = true;
3174 secy->replay_protect = false;
3175
3176 secy->sci = sci;
3177 secy->tx_sc.active = true;
3178 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3179 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3180 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3181 secy->tx_sc.end_station = false;
3182 secy->tx_sc.scb = false;
3183
3184 return 0;
3185 }
3186
3187 static int macsec_newlink(struct net *net, struct net_device *dev,
3188 struct nlattr *tb[], struct nlattr *data[])
3189 {
3190 struct macsec_dev *macsec = macsec_priv(dev);
3191 struct net_device *real_dev;
3192 int err;
3193 sci_t sci;
3194 u8 icv_len = DEFAULT_ICV_LEN;
3195 rx_handler_func_t *rx_handler;
3196
3197 if (!tb[IFLA_LINK])
3198 return -EINVAL;
3199 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3200 if (!real_dev)
3201 return -ENODEV;
3202
3203 dev->priv_flags |= IFF_MACSEC;
3204
3205 macsec->real_dev = real_dev;
3206
3207 if (data && data[IFLA_MACSEC_ICV_LEN])
3208 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3209 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3210
3211 rx_handler = rtnl_dereference(real_dev->rx_handler);
3212 if (rx_handler && rx_handler != macsec_handle_frame)
3213 return -EBUSY;
3214
3215 err = register_netdevice(dev);
3216 if (err < 0)
3217 return err;
3218
3219 dev_hold(real_dev);
3220
3221 macsec->nest_level = dev_get_nest_level(real_dev) + 1;
3222 netdev_lockdep_set_classes(dev);
3223 lockdep_set_class_and_subclass(&dev->addr_list_lock,
3224 &macsec_netdev_addr_lock_key,
3225 macsec_get_nest_level(dev));
3226
3227 err = netdev_upper_dev_link(real_dev, dev);
3228 if (err < 0)
3229 goto unregister;
3230
3231 /* need to be already registered so that ->init has run and
3232 * the MAC addr is set
3233 */
3234 if (data && data[IFLA_MACSEC_SCI])
3235 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3236 else if (data && data[IFLA_MACSEC_PORT])
3237 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3238 else
3239 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3240
3241 if (rx_handler && sci_exists(real_dev, sci)) {
3242 err = -EBUSY;
3243 goto unlink;
3244 }
3245
3246 err = macsec_add_dev(dev, sci, icv_len);
3247 if (err)
3248 goto unlink;
3249
3250 if (data)
3251 macsec_changelink_common(dev, data);
3252
3253 err = register_macsec_dev(real_dev, dev);
3254 if (err < 0)
3255 goto del_dev;
3256
3257 macsec_generation++;
3258
3259 return 0;
3260
3261 del_dev:
3262 macsec_del_dev(macsec);
3263 unlink:
3264 netdev_upper_dev_unlink(real_dev, dev);
3265 unregister:
3266 unregister_netdevice(dev);
3267 return err;
3268 }
3269
3270 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
3271 {
3272 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3273 u8 icv_len = DEFAULT_ICV_LEN;
3274 int flag;
3275 bool es, scb, sci;
3276
3277 if (!data)
3278 return 0;
3279
3280 if (data[IFLA_MACSEC_CIPHER_SUITE])
3281 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3282
3283 if (data[IFLA_MACSEC_ICV_LEN]) {
3284 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3285 if (icv_len != DEFAULT_ICV_LEN) {
3286 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
3287 struct crypto_aead *dummy_tfm;
3288
3289 dummy_tfm = macsec_alloc_tfm(dummy_key,
3290 DEFAULT_SAK_LEN,
3291 icv_len);
3292 if (IS_ERR(dummy_tfm))
3293 return PTR_ERR(dummy_tfm);
3294 crypto_free_aead(dummy_tfm);
3295 }
3296 }
3297
3298 switch (csid) {
3299 case MACSEC_DEFAULT_CIPHER_ID:
3300 case MACSEC_DEFAULT_CIPHER_ALT:
3301 if (icv_len < MACSEC_MIN_ICV_LEN ||
3302 icv_len > MACSEC_STD_ICV_LEN)
3303 return -EINVAL;
3304 break;
3305 default:
3306 return -EINVAL;
3307 }
3308
3309 if (data[IFLA_MACSEC_ENCODING_SA]) {
3310 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3311 return -EINVAL;
3312 }
3313
3314 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3315 flag < IFLA_MACSEC_VALIDATION;
3316 flag++) {
3317 if (data[flag]) {
3318 if (nla_get_u8(data[flag]) > 1)
3319 return -EINVAL;
3320 }
3321 }
3322
3323 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3324 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3325 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3326
3327 if ((sci && (scb || es)) || (scb && es))
3328 return -EINVAL;
3329
3330 if (data[IFLA_MACSEC_VALIDATION] &&
3331 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3332 return -EINVAL;
3333
3334 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3335 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3336 !data[IFLA_MACSEC_WINDOW])
3337 return -EINVAL;
3338
3339 return 0;
3340 }
3341
3342 static struct net *macsec_get_link_net(const struct net_device *dev)
3343 {
3344 return dev_net(macsec_priv(dev)->real_dev);
3345 }
3346
3347 static size_t macsec_get_size(const struct net_device *dev)
3348 {
3349 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
3350 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
3351 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
3352 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
3353 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
3354 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
3355 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
3356 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
3357 nla_total_size(1) + /* IFLA_MACSEC_ES */
3358 nla_total_size(1) + /* IFLA_MACSEC_SCB */
3359 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
3360 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
3361 0;
3362 }
3363
3364 static int macsec_fill_info(struct sk_buff *skb,
3365 const struct net_device *dev)
3366 {
3367 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3368 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3369
3370 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
3371 IFLA_MACSEC_PAD) ||
3372 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3373 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
3374 MACSEC_DEFAULT_CIPHER_ID, IFLA_MACSEC_PAD) ||
3375 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3376 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3377 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3378 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3379 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3380 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3381 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3382 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3383 0)
3384 goto nla_put_failure;
3385
3386 if (secy->replay_protect) {
3387 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3388 goto nla_put_failure;
3389 }
3390
3391 return 0;
3392
3393 nla_put_failure:
3394 return -EMSGSIZE;
3395 }
3396
3397 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3398 .kind = "macsec",
3399 .priv_size = sizeof(struct macsec_dev),
3400 .maxtype = IFLA_MACSEC_MAX,
3401 .policy = macsec_rtnl_policy,
3402 .setup = macsec_setup,
3403 .validate = macsec_validate_attr,
3404 .newlink = macsec_newlink,
3405 .changelink = macsec_changelink,
3406 .dellink = macsec_dellink,
3407 .get_size = macsec_get_size,
3408 .fill_info = macsec_fill_info,
3409 .get_link_net = macsec_get_link_net,
3410 };
3411
3412 static bool is_macsec_master(struct net_device *dev)
3413 {
3414 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3415 }
3416
3417 static int macsec_notify(struct notifier_block *this, unsigned long event,
3418 void *ptr)
3419 {
3420 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3421 LIST_HEAD(head);
3422
3423 if (!is_macsec_master(real_dev))
3424 return NOTIFY_DONE;
3425
3426 switch (event) {
3427 case NETDEV_UNREGISTER: {
3428 struct macsec_dev *m, *n;
3429 struct macsec_rxh_data *rxd;
3430
3431 rxd = macsec_data_rtnl(real_dev);
3432 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3433 macsec_common_dellink(m->secy.netdev, &head);
3434 }
3435
3436 netdev_rx_handler_unregister(real_dev);
3437 kfree(rxd);
3438
3439 unregister_netdevice_many(&head);
3440 break;
3441 }
3442 case NETDEV_CHANGEMTU: {
3443 struct macsec_dev *m;
3444 struct macsec_rxh_data *rxd;
3445
3446 rxd = macsec_data_rtnl(real_dev);
3447 list_for_each_entry(m, &rxd->secys, secys) {
3448 struct net_device *dev = m->secy.netdev;
3449 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3450 macsec_extra_len(true));
3451
3452 if (dev->mtu > mtu)
3453 dev_set_mtu(dev, mtu);
3454 }
3455 }
3456 }
3457
3458 return NOTIFY_OK;
3459 }
3460
3461 static struct notifier_block macsec_notifier = {
3462 .notifier_call = macsec_notify,
3463 };
3464
3465 static int __init macsec_init(void)
3466 {
3467 int err;
3468
3469 pr_info("MACsec IEEE 802.1AE\n");
3470 err = register_netdevice_notifier(&macsec_notifier);
3471 if (err)
3472 return err;
3473
3474 err = rtnl_link_register(&macsec_link_ops);
3475 if (err)
3476 goto notifier;
3477
3478 err = genl_register_family(&macsec_fam);
3479 if (err)
3480 goto rtnl;
3481
3482 return 0;
3483
3484 rtnl:
3485 rtnl_link_unregister(&macsec_link_ops);
3486 notifier:
3487 unregister_netdevice_notifier(&macsec_notifier);
3488 return err;
3489 }
3490
3491 static void __exit macsec_exit(void)
3492 {
3493 genl_unregister_family(&macsec_fam);
3494 rtnl_link_unregister(&macsec_link_ops);
3495 unregister_netdevice_notifier(&macsec_notifier);
3496 rcu_barrier();
3497 }
3498
3499 module_init(macsec_init);
3500 module_exit(macsec_exit);
3501
3502 MODULE_ALIAS_RTNL_LINK("macsec");
3503
3504 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3505 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support