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perf bench futex: Cache align the worker struct
[linux/fpc-iii.git] / drivers / net / macsec.c
blob3ea47f28e143bd03113215f45a0ad7b7eb9ceb61
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 sci_t make_sci(u8 *addr, __be16 port)
401 {
402 sci_t sci;
403
404 memcpy(&sci, addr, ETH_ALEN);
405 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
406
407 return sci;
408 }
409
410 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
411 {
412 sci_t sci;
413
414 if (sci_present)
415 memcpy(&sci, hdr->secure_channel_id,
416 sizeof(hdr->secure_channel_id));
417 else
418 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
419
420 return sci;
421 }
422
423 static unsigned int macsec_sectag_len(bool sci_present)
424 {
425 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
426 }
427
428 static unsigned int macsec_hdr_len(bool sci_present)
429 {
430 return macsec_sectag_len(sci_present) + ETH_HLEN;
431 }
432
433 static unsigned int macsec_extra_len(bool sci_present)
434 {
435 return macsec_sectag_len(sci_present) + sizeof(__be16);
436 }
437
438 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
439 static void macsec_fill_sectag(struct macsec_eth_header *h,
440 const struct macsec_secy *secy, u32 pn)
441 {
442 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
443
444 memset(&h->tci_an, 0, macsec_sectag_len(tx_sc->send_sci));
445 h->eth.h_proto = htons(ETH_P_MACSEC);
446
447 if (tx_sc->send_sci ||
448 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb)) {
449 h->tci_an |= MACSEC_TCI_SC;
450 memcpy(&h->secure_channel_id, &secy->sci,
451 sizeof(h->secure_channel_id));
452 } else {
453 if (tx_sc->end_station)
454 h->tci_an |= MACSEC_TCI_ES;
455 if (tx_sc->scb)
456 h->tci_an |= MACSEC_TCI_SCB;
457 }
458
459 h->packet_number = htonl(pn);
460
461 /* with GCM, C/E clear for !encrypt, both set for encrypt */
462 if (tx_sc->encrypt)
463 h->tci_an |= MACSEC_TCI_CONFID;
464 else if (secy->icv_len != DEFAULT_ICV_LEN)
465 h->tci_an |= MACSEC_TCI_C;
466
467 h->tci_an |= tx_sc->encoding_sa;
468 }
469
470 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
471 {
472 if (data_len < MIN_NON_SHORT_LEN)
473 h->short_length = data_len;
474 }
475
476 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
477 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
478 {
479 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
480 int len = skb->len - 2 * ETH_ALEN;
481 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
482
483 /* a) It comprises at least 17 octets */
484 if (skb->len <= 16)
485 return false;
486
487 /* b) MACsec EtherType: already checked */
488
489 /* c) V bit is clear */
490 if (h->tci_an & MACSEC_TCI_VERSION)
491 return false;
492
493 /* d) ES or SCB => !SC */
494 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
495 (h->tci_an & MACSEC_TCI_SC))
496 return false;
497
498 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
499 if (h->unused)
500 return false;
501
502 /* rx.pn != 0 (figure 10-5) */
503 if (!h->packet_number)
504 return false;
505
506 /* length check, f) g) h) i) */
507 if (h->short_length)
508 return len == extra_len + h->short_length;
509 return len >= extra_len + MIN_NON_SHORT_LEN;
510 }
511
512 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
513 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
514
515 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
516 {
517 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
518
519 gcm_iv->sci = sci;
520 gcm_iv->pn = htonl(pn);
521 }
522
523 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
524 {
525 return (struct macsec_eth_header *)skb_mac_header(skb);
526 }
527
528 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
529 {
530 u32 pn;
531
532 spin_lock_bh(&tx_sa->lock);
533 pn = tx_sa->next_pn;
534
535 tx_sa->next_pn++;
536 if (tx_sa->next_pn == 0) {
537 pr_debug("PN wrapped, transitioning to !oper\n");
538 tx_sa->active = false;
539 if (secy->protect_frames)
540 secy->operational = false;
541 }
542 spin_unlock_bh(&tx_sa->lock);
543
544 return pn;
545 }
546
547 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
548 {
549 struct macsec_dev *macsec = netdev_priv(dev);
550
551 skb->dev = macsec->real_dev;
552 skb_reset_mac_header(skb);
553 skb->protocol = eth_hdr(skb)->h_proto;
554 }
555
556 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
557 struct macsec_tx_sa *tx_sa)
558 {
559 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
560
561 u64_stats_update_begin(&txsc_stats->syncp);
562 if (tx_sc->encrypt) {
563 txsc_stats->stats.OutOctetsEncrypted += skb->len;
564 txsc_stats->stats.OutPktsEncrypted++;
565 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
566 } else {
567 txsc_stats->stats.OutOctetsProtected += skb->len;
568 txsc_stats->stats.OutPktsProtected++;
569 this_cpu_inc(tx_sa->stats->OutPktsProtected);
570 }
571 u64_stats_update_end(&txsc_stats->syncp);
572 }
573
574 static void count_tx(struct net_device *dev, int ret, int len)
575 {
576 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
577 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
578
579 u64_stats_update_begin(&stats->syncp);
580 stats->tx_packets++;
581 stats->tx_bytes += len;
582 u64_stats_update_end(&stats->syncp);
583 } else {
584 dev->stats.tx_dropped++;
585 }
586 }
587
588 static void macsec_encrypt_done(struct crypto_async_request *base, int err)
589 {
590 struct sk_buff *skb = base->data;
591 struct net_device *dev = skb->dev;
592 struct macsec_dev *macsec = macsec_priv(dev);
593 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
594 int len, ret;
595
596 aead_request_free(macsec_skb_cb(skb)->req);
597
598 rcu_read_lock_bh();
599 macsec_encrypt_finish(skb, dev);
600 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
601 len = skb->len;
602 ret = dev_queue_xmit(skb);
603 count_tx(dev, ret, len);
604 rcu_read_unlock_bh();
605
606 macsec_txsa_put(sa);
607 dev_put(dev);
608 }
609
610 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
611 unsigned char **iv,
612 struct scatterlist **sg)
613 {
614 size_t size, iv_offset, sg_offset;
615 struct aead_request *req;
616 void *tmp;
617
618 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
619 iv_offset = size;
620 size += GCM_AES_IV_LEN;
621
622 size = ALIGN(size, __alignof__(struct scatterlist));
623 sg_offset = size;
624 size += sizeof(struct scatterlist) * (MAX_SKB_FRAGS + 1);
625
626 tmp = kmalloc(size, GFP_ATOMIC);
627 if (!tmp)
628 return NULL;
629
630 *iv = (unsigned char *)(tmp + iv_offset);
631 *sg = (struct scatterlist *)(tmp + sg_offset);
632 req = tmp;
633
634 aead_request_set_tfm(req, tfm);
635
636 return req;
637 }
638
639 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
640 struct net_device *dev)
641 {
642 int ret;
643 struct scatterlist *sg;
644 unsigned char *iv;
645 struct ethhdr *eth;
646 struct macsec_eth_header *hh;
647 size_t unprotected_len;
648 struct aead_request *req;
649 struct macsec_secy *secy;
650 struct macsec_tx_sc *tx_sc;
651 struct macsec_tx_sa *tx_sa;
652 struct macsec_dev *macsec = macsec_priv(dev);
653 u32 pn;
654
655 secy = &macsec->secy;
656 tx_sc = &secy->tx_sc;
657
658 /* 10.5.1 TX SA assignment */
659 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
660 if (!tx_sa) {
661 secy->operational = false;
662 kfree_skb(skb);
663 return ERR_PTR(-EINVAL);
664 }
665
666 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
667 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
668 struct sk_buff *nskb = skb_copy_expand(skb,
669 MACSEC_NEEDED_HEADROOM,
670 MACSEC_NEEDED_TAILROOM,
671 GFP_ATOMIC);
672 if (likely(nskb)) {
673 consume_skb(skb);
674 skb = nskb;
675 } else {
676 macsec_txsa_put(tx_sa);
677 kfree_skb(skb);
678 return ERR_PTR(-ENOMEM);
679 }
680 } else {
681 skb = skb_unshare(skb, GFP_ATOMIC);
682 if (!skb) {
683 macsec_txsa_put(tx_sa);
684 return ERR_PTR(-ENOMEM);
685 }
686 }
687
688 unprotected_len = skb->len;
689 eth = eth_hdr(skb);
690 hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(tx_sc->send_sci));
691 memmove(hh, eth, 2 * ETH_ALEN);
692
693 pn = tx_sa_update_pn(tx_sa, secy);
694 if (pn == 0) {
695 macsec_txsa_put(tx_sa);
696 kfree_skb(skb);
697 return ERR_PTR(-ENOLINK);
698 }
699 macsec_fill_sectag(hh, secy, pn);
700 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
701
702 skb_put(skb, secy->icv_len);
703
704 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
705 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
706
707 u64_stats_update_begin(&secy_stats->syncp);
708 secy_stats->stats.OutPktsTooLong++;
709 u64_stats_update_end(&secy_stats->syncp);
710
711 macsec_txsa_put(tx_sa);
712 kfree_skb(skb);
713 return ERR_PTR(-EINVAL);
714 }
715
716 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg);
717 if (!req) {
718 macsec_txsa_put(tx_sa);
719 kfree_skb(skb);
720 return ERR_PTR(-ENOMEM);
721 }
722
723 macsec_fill_iv(iv, secy->sci, pn);
724
725 sg_init_table(sg, MAX_SKB_FRAGS + 1);
726 skb_to_sgvec(skb, sg, 0, skb->len);
727
728 if (tx_sc->encrypt) {
729 int len = skb->len - macsec_hdr_len(tx_sc->send_sci) -
730 secy->icv_len;
731 aead_request_set_crypt(req, sg, sg, len, iv);
732 aead_request_set_ad(req, macsec_hdr_len(tx_sc->send_sci));
733 } else {
734 aead_request_set_crypt(req, sg, sg, 0, iv);
735 aead_request_set_ad(req, skb->len - secy->icv_len);
736 }
737
738 macsec_skb_cb(skb)->req = req;
739 macsec_skb_cb(skb)->tx_sa = tx_sa;
740 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
741
742 dev_hold(skb->dev);
743 ret = crypto_aead_encrypt(req);
744 if (ret == -EINPROGRESS) {
745 return ERR_PTR(ret);
746 } else if (ret != 0) {
747 dev_put(skb->dev);
748 kfree_skb(skb);
749 aead_request_free(req);
750 macsec_txsa_put(tx_sa);
751 return ERR_PTR(-EINVAL);
752 }
753
754 dev_put(skb->dev);
755 aead_request_free(req);
756 macsec_txsa_put(tx_sa);
757
758 return skb;
759 }
760
761 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
762 {
763 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
764 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
765 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
766 u32 lowest_pn = 0;
767
768 spin_lock(&rx_sa->lock);
769 if (rx_sa->next_pn >= secy->replay_window)
770 lowest_pn = rx_sa->next_pn - secy->replay_window;
771
772 /* Now perform replay protection check again
773 * (see IEEE 802.1AE-2006 figure 10-5)
774 */
775 if (secy->replay_protect && pn < lowest_pn) {
776 spin_unlock(&rx_sa->lock);
777 u64_stats_update_begin(&rxsc_stats->syncp);
778 rxsc_stats->stats.InPktsLate++;
779 u64_stats_update_end(&rxsc_stats->syncp);
780 return false;
781 }
782
783 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
784 u64_stats_update_begin(&rxsc_stats->syncp);
785 if (hdr->tci_an & MACSEC_TCI_E)
786 rxsc_stats->stats.InOctetsDecrypted += skb->len;
787 else
788 rxsc_stats->stats.InOctetsValidated += skb->len;
789 u64_stats_update_end(&rxsc_stats->syncp);
790 }
791
792 if (!macsec_skb_cb(skb)->valid) {
793 spin_unlock(&rx_sa->lock);
794
795 /* 10.6.5 */
796 if (hdr->tci_an & MACSEC_TCI_C ||
797 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
798 u64_stats_update_begin(&rxsc_stats->syncp);
799 rxsc_stats->stats.InPktsNotValid++;
800 u64_stats_update_end(&rxsc_stats->syncp);
801 return false;
802 }
803
804 u64_stats_update_begin(&rxsc_stats->syncp);
805 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
806 rxsc_stats->stats.InPktsInvalid++;
807 this_cpu_inc(rx_sa->stats->InPktsInvalid);
808 } else if (pn < lowest_pn) {
809 rxsc_stats->stats.InPktsDelayed++;
810 } else {
811 rxsc_stats->stats.InPktsUnchecked++;
812 }
813 u64_stats_update_end(&rxsc_stats->syncp);
814 } else {
815 u64_stats_update_begin(&rxsc_stats->syncp);
816 if (pn < lowest_pn) {
817 rxsc_stats->stats.InPktsDelayed++;
818 } else {
819 rxsc_stats->stats.InPktsOK++;
820 this_cpu_inc(rx_sa->stats->InPktsOK);
821 }
822 u64_stats_update_end(&rxsc_stats->syncp);
823
824 if (pn >= rx_sa->next_pn)
825 rx_sa->next_pn = pn + 1;
826 spin_unlock(&rx_sa->lock);
827 }
828
829 return true;
830 }
831
832 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
833 {
834 skb->pkt_type = PACKET_HOST;
835 skb->protocol = eth_type_trans(skb, dev);
836
837 skb_reset_network_header(skb);
838 if (!skb_transport_header_was_set(skb))
839 skb_reset_transport_header(skb);
840 skb_reset_mac_len(skb);
841 }
842
843 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
844 {
845 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
846 skb_pull(skb, hdr_len);
847 pskb_trim_unique(skb, skb->len - icv_len);
848 }
849
850 static void count_rx(struct net_device *dev, int len)
851 {
852 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
853
854 u64_stats_update_begin(&stats->syncp);
855 stats->rx_packets++;
856 stats->rx_bytes += len;
857 u64_stats_update_end(&stats->syncp);
858 }
859
860 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
861 {
862 struct sk_buff *skb = base->data;
863 struct net_device *dev = skb->dev;
864 struct macsec_dev *macsec = macsec_priv(dev);
865 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
866 struct macsec_rx_sc *rx_sc = rx_sa->sc;
867 int len, ret;
868 u32 pn;
869
870 aead_request_free(macsec_skb_cb(skb)->req);
871
872 rcu_read_lock_bh();
873 pn = ntohl(macsec_ethhdr(skb)->packet_number);
874 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
875 rcu_read_unlock_bh();
876 kfree_skb(skb);
877 goto out;
878 }
879
880 macsec_finalize_skb(skb, macsec->secy.icv_len,
881 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
882 macsec_reset_skb(skb, macsec->secy.netdev);
883
884 len = skb->len;
885 ret = gro_cells_receive(&macsec->gro_cells, skb);
886 if (ret == NET_RX_SUCCESS)
887 count_rx(dev, len);
888 else
889 macsec->secy.netdev->stats.rx_dropped++;
890
891 rcu_read_unlock_bh();
892
893 out:
894 macsec_rxsa_put(rx_sa);
895 macsec_rxsc_put(rx_sc);
896 dev_put(dev);
897 }
898
899 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
900 struct net_device *dev,
901 struct macsec_rx_sa *rx_sa,
902 sci_t sci,
903 struct macsec_secy *secy)
904 {
905 int ret;
906 struct scatterlist *sg;
907 unsigned char *iv;
908 struct aead_request *req;
909 struct macsec_eth_header *hdr;
910 u16 icv_len = secy->icv_len;
911
912 macsec_skb_cb(skb)->valid = false;
913 skb = skb_share_check(skb, GFP_ATOMIC);
914 if (!skb)
915 return ERR_PTR(-ENOMEM);
916
917 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg);
918 if (!req) {
919 kfree_skb(skb);
920 return ERR_PTR(-ENOMEM);
921 }
922
923 hdr = (struct macsec_eth_header *)skb->data;
924 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
925
926 sg_init_table(sg, MAX_SKB_FRAGS + 1);
927 skb_to_sgvec(skb, sg, 0, skb->len);
928
929 if (hdr->tci_an & MACSEC_TCI_E) {
930 /* confidentiality: ethernet + macsec header
931 * authenticated, encrypted payload
932 */
933 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
934
935 aead_request_set_crypt(req, sg, sg, len, iv);
936 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
937 skb = skb_unshare(skb, GFP_ATOMIC);
938 if (!skb) {
939 aead_request_free(req);
940 return ERR_PTR(-ENOMEM);
941 }
942 } else {
943 /* integrity only: all headers + data authenticated */
944 aead_request_set_crypt(req, sg, sg, icv_len, iv);
945 aead_request_set_ad(req, skb->len - icv_len);
946 }
947
948 macsec_skb_cb(skb)->req = req;
949 skb->dev = dev;
950 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
951
952 dev_hold(dev);
953 ret = crypto_aead_decrypt(req);
954 if (ret == -EINPROGRESS) {
955 return ERR_PTR(ret);
956 } else if (ret != 0) {
957 /* decryption/authentication failed
958 * 10.6 if validateFrames is disabled, deliver anyway
959 */
960 if (ret != -EBADMSG) {
961 kfree_skb(skb);
962 skb = ERR_PTR(ret);
963 }
964 } else {
965 macsec_skb_cb(skb)->valid = true;
966 }
967 dev_put(dev);
968
969 aead_request_free(req);
970
971 return skb;
972 }
973
974 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
975 {
976 struct macsec_rx_sc *rx_sc;
977
978 for_each_rxsc(secy, rx_sc) {
979 if (rx_sc->sci == sci)
980 return rx_sc;
981 }
982
983 return NULL;
984 }
985
986 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
987 {
988 struct macsec_rx_sc *rx_sc;
989
990 for_each_rxsc_rtnl(secy, rx_sc) {
991 if (rx_sc->sci == sci)
992 return rx_sc;
993 }
994
995 return NULL;
996 }
997
998 static void handle_not_macsec(struct sk_buff *skb)
999 {
1000 struct macsec_rxh_data *rxd;
1001 struct macsec_dev *macsec;
1002
1003 rcu_read_lock();
1004 rxd = macsec_data_rcu(skb->dev);
1005
1006 /* 10.6 If the management control validateFrames is not
1007 * Strict, frames without a SecTAG are received, counted, and
1008 * delivered to the Controlled Port
1009 */
1010 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1011 struct sk_buff *nskb;
1012 int ret;
1013 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1014
1015 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1016 u64_stats_update_begin(&secy_stats->syncp);
1017 secy_stats->stats.InPktsNoTag++;
1018 u64_stats_update_end(&secy_stats->syncp);
1019 continue;
1020 }
1021
1022 /* deliver on this port */
1023 nskb = skb_clone(skb, GFP_ATOMIC);
1024 if (!nskb)
1025 break;
1026
1027 nskb->dev = macsec->secy.netdev;
1028
1029 ret = netif_rx(nskb);
1030 if (ret == NET_RX_SUCCESS) {
1031 u64_stats_update_begin(&secy_stats->syncp);
1032 secy_stats->stats.InPktsUntagged++;
1033 u64_stats_update_end(&secy_stats->syncp);
1034 } else {
1035 macsec->secy.netdev->stats.rx_dropped++;
1036 }
1037 }
1038
1039 rcu_read_unlock();
1040 }
1041
1042 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1043 {
1044 struct sk_buff *skb = *pskb;
1045 struct net_device *dev = skb->dev;
1046 struct macsec_eth_header *hdr;
1047 struct macsec_secy *secy = NULL;
1048 struct macsec_rx_sc *rx_sc;
1049 struct macsec_rx_sa *rx_sa;
1050 struct macsec_rxh_data *rxd;
1051 struct macsec_dev *macsec;
1052 sci_t sci;
1053 u32 pn;
1054 bool cbit;
1055 struct pcpu_rx_sc_stats *rxsc_stats;
1056 struct pcpu_secy_stats *secy_stats;
1057 bool pulled_sci;
1058 int ret;
1059
1060 if (skb_headroom(skb) < ETH_HLEN)
1061 goto drop_direct;
1062
1063 hdr = macsec_ethhdr(skb);
1064 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1065 handle_not_macsec(skb);
1066
1067 /* and deliver to the uncontrolled port */
1068 return RX_HANDLER_PASS;
1069 }
1070
1071 skb = skb_unshare(skb, GFP_ATOMIC);
1072 if (!skb) {
1073 *pskb = NULL;
1074 return RX_HANDLER_CONSUMED;
1075 }
1076
1077 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1078 if (!pulled_sci) {
1079 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1080 goto drop_direct;
1081 }
1082
1083 hdr = macsec_ethhdr(skb);
1084
1085 /* Frames with a SecTAG that has the TCI E bit set but the C
1086 * bit clear are discarded, as this reserved encoding is used
1087 * to identify frames with a SecTAG that are not to be
1088 * delivered to the Controlled Port.
1089 */
1090 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1091 return RX_HANDLER_PASS;
1092
1093 /* now, pull the extra length */
1094 if (hdr->tci_an & MACSEC_TCI_SC) {
1095 if (!pulled_sci)
1096 goto drop_direct;
1097 }
1098
1099 /* ethernet header is part of crypto processing */
1100 skb_push(skb, ETH_HLEN);
1101
1102 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1103 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1104 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1105
1106 rcu_read_lock();
1107 rxd = macsec_data_rcu(skb->dev);
1108
1109 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1110 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1111 sc = sc ? macsec_rxsc_get(sc) : NULL;
1112
1113 if (sc) {
1114 secy = &macsec->secy;
1115 rx_sc = sc;
1116 break;
1117 }
1118 }
1119
1120 if (!secy)
1121 goto nosci;
1122
1123 dev = secy->netdev;
1124 macsec = macsec_priv(dev);
1125 secy_stats = this_cpu_ptr(macsec->stats);
1126 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1127
1128 if (!macsec_validate_skb(skb, secy->icv_len)) {
1129 u64_stats_update_begin(&secy_stats->syncp);
1130 secy_stats->stats.InPktsBadTag++;
1131 u64_stats_update_end(&secy_stats->syncp);
1132 goto drop_nosa;
1133 }
1134
1135 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1136 if (!rx_sa) {
1137 /* 10.6.1 if the SA is not in use */
1138
1139 /* If validateFrames is Strict or the C bit in the
1140 * SecTAG is set, discard
1141 */
1142 if (hdr->tci_an & MACSEC_TCI_C ||
1143 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1144 u64_stats_update_begin(&rxsc_stats->syncp);
1145 rxsc_stats->stats.InPktsNotUsingSA++;
1146 u64_stats_update_end(&rxsc_stats->syncp);
1147 goto drop_nosa;
1148 }
1149
1150 /* not Strict, the frame (with the SecTAG and ICV
1151 * removed) is delivered to the Controlled Port.
1152 */
1153 u64_stats_update_begin(&rxsc_stats->syncp);
1154 rxsc_stats->stats.InPktsUnusedSA++;
1155 u64_stats_update_end(&rxsc_stats->syncp);
1156 goto deliver;
1157 }
1158
1159 /* First, PN check to avoid decrypting obviously wrong packets */
1160 pn = ntohl(hdr->packet_number);
1161 if (secy->replay_protect) {
1162 bool late;
1163
1164 spin_lock(&rx_sa->lock);
1165 late = rx_sa->next_pn >= secy->replay_window &&
1166 pn < (rx_sa->next_pn - secy->replay_window);
1167 spin_unlock(&rx_sa->lock);
1168
1169 if (late) {
1170 u64_stats_update_begin(&rxsc_stats->syncp);
1171 rxsc_stats->stats.InPktsLate++;
1172 u64_stats_update_end(&rxsc_stats->syncp);
1173 goto drop;
1174 }
1175 }
1176
1177 macsec_skb_cb(skb)->rx_sa = rx_sa;
1178
1179 /* Disabled && !changed text => skip validation */
1180 if (hdr->tci_an & MACSEC_TCI_C ||
1181 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1182 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1183
1184 if (IS_ERR(skb)) {
1185 /* the decrypt callback needs the reference */
1186 if (PTR_ERR(skb) != -EINPROGRESS) {
1187 macsec_rxsa_put(rx_sa);
1188 macsec_rxsc_put(rx_sc);
1189 }
1190 rcu_read_unlock();
1191 *pskb = NULL;
1192 return RX_HANDLER_CONSUMED;
1193 }
1194
1195 if (!macsec_post_decrypt(skb, secy, pn))
1196 goto drop;
1197
1198 deliver:
1199 macsec_finalize_skb(skb, secy->icv_len,
1200 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1201 macsec_reset_skb(skb, secy->netdev);
1202
1203 if (rx_sa)
1204 macsec_rxsa_put(rx_sa);
1205 macsec_rxsc_put(rx_sc);
1206
1207 ret = gro_cells_receive(&macsec->gro_cells, skb);
1208 if (ret == NET_RX_SUCCESS)
1209 count_rx(dev, skb->len);
1210 else
1211 macsec->secy.netdev->stats.rx_dropped++;
1212
1213 rcu_read_unlock();
1214
1215 *pskb = NULL;
1216 return RX_HANDLER_CONSUMED;
1217
1218 drop:
1219 macsec_rxsa_put(rx_sa);
1220 drop_nosa:
1221 macsec_rxsc_put(rx_sc);
1222 rcu_read_unlock();
1223 drop_direct:
1224 kfree_skb(skb);
1225 *pskb = NULL;
1226 return RX_HANDLER_CONSUMED;
1227
1228 nosci:
1229 /* 10.6.1 if the SC is not found */
1230 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1231 if (!cbit)
1232 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1233 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1234
1235 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1236 struct sk_buff *nskb;
1237
1238 secy_stats = this_cpu_ptr(macsec->stats);
1239
1240 /* If validateFrames is Strict or the C bit in the
1241 * SecTAG is set, discard
1242 */
1243 if (cbit ||
1244 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1245 u64_stats_update_begin(&secy_stats->syncp);
1246 secy_stats->stats.InPktsNoSCI++;
1247 u64_stats_update_end(&secy_stats->syncp);
1248 continue;
1249 }
1250
1251 /* not strict, the frame (with the SecTAG and ICV
1252 * removed) is delivered to the Controlled Port.
1253 */
1254 nskb = skb_clone(skb, GFP_ATOMIC);
1255 if (!nskb)
1256 break;
1257
1258 macsec_reset_skb(nskb, macsec->secy.netdev);
1259
1260 ret = netif_rx(nskb);
1261 if (ret == NET_RX_SUCCESS) {
1262 u64_stats_update_begin(&secy_stats->syncp);
1263 secy_stats->stats.InPktsUnknownSCI++;
1264 u64_stats_update_end(&secy_stats->syncp);
1265 } else {
1266 macsec->secy.netdev->stats.rx_dropped++;
1267 }
1268 }
1269
1270 rcu_read_unlock();
1271 *pskb = skb;
1272 return RX_HANDLER_PASS;
1273 }
1274
1275 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1276 {
1277 struct crypto_aead *tfm;
1278 int ret;
1279
1280 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1281
1282 if (IS_ERR(tfm))
1283 return tfm;
1284
1285 ret = crypto_aead_setkey(tfm, key, key_len);
1286 if (ret < 0)
1287 goto fail;
1288
1289 ret = crypto_aead_setauthsize(tfm, icv_len);
1290 if (ret < 0)
1291 goto fail;
1292
1293 return tfm;
1294 fail:
1295 crypto_free_aead(tfm);
1296 return ERR_PTR(ret);
1297 }
1298
1299 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1300 int icv_len)
1301 {
1302 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1303 if (!rx_sa->stats)
1304 return -ENOMEM;
1305
1306 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1307 if (IS_ERR(rx_sa->key.tfm)) {
1308 free_percpu(rx_sa->stats);
1309 return PTR_ERR(rx_sa->key.tfm);
1310 }
1311
1312 rx_sa->active = false;
1313 rx_sa->next_pn = 1;
1314 atomic_set(&rx_sa->refcnt, 1);
1315 spin_lock_init(&rx_sa->lock);
1316
1317 return 0;
1318 }
1319
1320 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1321 {
1322 rx_sa->active = false;
1323
1324 macsec_rxsa_put(rx_sa);
1325 }
1326
1327 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1328 {
1329 int i;
1330
1331 for (i = 0; i < MACSEC_NUM_AN; i++) {
1332 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1333
1334 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1335 if (sa)
1336 clear_rx_sa(sa);
1337 }
1338
1339 macsec_rxsc_put(rx_sc);
1340 }
1341
1342 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1343 {
1344 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1345
1346 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1347 rx_sc;
1348 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1349 if (rx_sc->sci == sci) {
1350 if (rx_sc->active)
1351 secy->n_rx_sc--;
1352 rcu_assign_pointer(*rx_scp, rx_sc->next);
1353 return rx_sc;
1354 }
1355 }
1356
1357 return NULL;
1358 }
1359
1360 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1361 {
1362 struct macsec_rx_sc *rx_sc;
1363 struct macsec_dev *macsec;
1364 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1365 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1366 struct macsec_secy *secy;
1367
1368 list_for_each_entry(macsec, &rxd->secys, secys) {
1369 if (find_rx_sc_rtnl(&macsec->secy, sci))
1370 return ERR_PTR(-EEXIST);
1371 }
1372
1373 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1374 if (!rx_sc)
1375 return ERR_PTR(-ENOMEM);
1376
1377 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1378 if (!rx_sc->stats) {
1379 kfree(rx_sc);
1380 return ERR_PTR(-ENOMEM);
1381 }
1382
1383 rx_sc->sci = sci;
1384 rx_sc->active = true;
1385 atomic_set(&rx_sc->refcnt, 1);
1386
1387 secy = &macsec_priv(dev)->secy;
1388 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1389 rcu_assign_pointer(secy->rx_sc, rx_sc);
1390
1391 if (rx_sc->active)
1392 secy->n_rx_sc++;
1393
1394 return rx_sc;
1395 }
1396
1397 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1398 int icv_len)
1399 {
1400 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1401 if (!tx_sa->stats)
1402 return -ENOMEM;
1403
1404 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1405 if (IS_ERR(tx_sa->key.tfm)) {
1406 free_percpu(tx_sa->stats);
1407 return PTR_ERR(tx_sa->key.tfm);
1408 }
1409
1410 tx_sa->active = false;
1411 atomic_set(&tx_sa->refcnt, 1);
1412 spin_lock_init(&tx_sa->lock);
1413
1414 return 0;
1415 }
1416
1417 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1418 {
1419 tx_sa->active = false;
1420
1421 macsec_txsa_put(tx_sa);
1422 }
1423
1424 static struct genl_family macsec_fam = {
1425 .id = GENL_ID_GENERATE,
1426 .name = MACSEC_GENL_NAME,
1427 .hdrsize = 0,
1428 .version = MACSEC_GENL_VERSION,
1429 .maxattr = MACSEC_ATTR_MAX,
1430 .netnsok = true,
1431 };
1432
1433 static struct net_device *get_dev_from_nl(struct net *net,
1434 struct nlattr **attrs)
1435 {
1436 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1437 struct net_device *dev;
1438
1439 dev = __dev_get_by_index(net, ifindex);
1440 if (!dev)
1441 return ERR_PTR(-ENODEV);
1442
1443 if (!netif_is_macsec(dev))
1444 return ERR_PTR(-ENODEV);
1445
1446 return dev;
1447 }
1448
1449 static sci_t nla_get_sci(const struct nlattr *nla)
1450 {
1451 return (__force sci_t)nla_get_u64(nla);
1452 }
1453
1454 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1455 int padattr)
1456 {
1457 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1458 }
1459
1460 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1461 struct nlattr **attrs,
1462 struct nlattr **tb_sa,
1463 struct net_device **devp,
1464 struct macsec_secy **secyp,
1465 struct macsec_tx_sc **scp,
1466 u8 *assoc_num)
1467 {
1468 struct net_device *dev;
1469 struct macsec_secy *secy;
1470 struct macsec_tx_sc *tx_sc;
1471 struct macsec_tx_sa *tx_sa;
1472
1473 if (!tb_sa[MACSEC_SA_ATTR_AN])
1474 return ERR_PTR(-EINVAL);
1475
1476 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1477
1478 dev = get_dev_from_nl(net, attrs);
1479 if (IS_ERR(dev))
1480 return ERR_CAST(dev);
1481
1482 if (*assoc_num >= MACSEC_NUM_AN)
1483 return ERR_PTR(-EINVAL);
1484
1485 secy = &macsec_priv(dev)->secy;
1486 tx_sc = &secy->tx_sc;
1487
1488 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1489 if (!tx_sa)
1490 return ERR_PTR(-ENODEV);
1491
1492 *devp = dev;
1493 *scp = tx_sc;
1494 *secyp = secy;
1495 return tx_sa;
1496 }
1497
1498 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1499 struct nlattr **attrs,
1500 struct nlattr **tb_rxsc,
1501 struct net_device **devp,
1502 struct macsec_secy **secyp)
1503 {
1504 struct net_device *dev;
1505 struct macsec_secy *secy;
1506 struct macsec_rx_sc *rx_sc;
1507 sci_t sci;
1508
1509 dev = get_dev_from_nl(net, attrs);
1510 if (IS_ERR(dev))
1511 return ERR_CAST(dev);
1512
1513 secy = &macsec_priv(dev)->secy;
1514
1515 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1516 return ERR_PTR(-EINVAL);
1517
1518 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1519 rx_sc = find_rx_sc_rtnl(secy, sci);
1520 if (!rx_sc)
1521 return ERR_PTR(-ENODEV);
1522
1523 *secyp = secy;
1524 *devp = dev;
1525
1526 return rx_sc;
1527 }
1528
1529 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1530 struct nlattr **attrs,
1531 struct nlattr **tb_rxsc,
1532 struct nlattr **tb_sa,
1533 struct net_device **devp,
1534 struct macsec_secy **secyp,
1535 struct macsec_rx_sc **scp,
1536 u8 *assoc_num)
1537 {
1538 struct macsec_rx_sc *rx_sc;
1539 struct macsec_rx_sa *rx_sa;
1540
1541 if (!tb_sa[MACSEC_SA_ATTR_AN])
1542 return ERR_PTR(-EINVAL);
1543
1544 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1545 if (*assoc_num >= MACSEC_NUM_AN)
1546 return ERR_PTR(-EINVAL);
1547
1548 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1549 if (IS_ERR(rx_sc))
1550 return ERR_CAST(rx_sc);
1551
1552 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1553 if (!rx_sa)
1554 return ERR_PTR(-ENODEV);
1555
1556 *scp = rx_sc;
1557 return rx_sa;
1558 }
1559
1560
1561 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1562 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1563 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1564 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1565 };
1566
1567 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1568 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1569 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1570 };
1571
1572 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1573 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1574 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1575 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1576 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1577 .len = MACSEC_KEYID_LEN, },
1578 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1579 .len = MACSEC_MAX_KEY_LEN, },
1580 };
1581
1582 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1583 {
1584 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1585 return -EINVAL;
1586
1587 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG],
1588 macsec_genl_sa_policy))
1589 return -EINVAL;
1590
1591 return 0;
1592 }
1593
1594 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1595 {
1596 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1597 return -EINVAL;
1598
1599 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG],
1600 macsec_genl_rxsc_policy))
1601 return -EINVAL;
1602
1603 return 0;
1604 }
1605
1606 static bool validate_add_rxsa(struct nlattr **attrs)
1607 {
1608 if (!attrs[MACSEC_SA_ATTR_AN] ||
1609 !attrs[MACSEC_SA_ATTR_KEY] ||
1610 !attrs[MACSEC_SA_ATTR_KEYID])
1611 return false;
1612
1613 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1614 return false;
1615
1616 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1617 return false;
1618
1619 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1620 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1621 return false;
1622 }
1623
1624 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1625 return false;
1626
1627 return true;
1628 }
1629
1630 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1631 {
1632 struct net_device *dev;
1633 struct nlattr **attrs = info->attrs;
1634 struct macsec_secy *secy;
1635 struct macsec_rx_sc *rx_sc;
1636 struct macsec_rx_sa *rx_sa;
1637 unsigned char assoc_num;
1638 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1639 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1640 int err;
1641
1642 if (!attrs[MACSEC_ATTR_IFINDEX])
1643 return -EINVAL;
1644
1645 if (parse_sa_config(attrs, tb_sa))
1646 return -EINVAL;
1647
1648 if (parse_rxsc_config(attrs, tb_rxsc))
1649 return -EINVAL;
1650
1651 if (!validate_add_rxsa(tb_sa))
1652 return -EINVAL;
1653
1654 rtnl_lock();
1655 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1656 if (IS_ERR(rx_sc)) {
1657 rtnl_unlock();
1658 return PTR_ERR(rx_sc);
1659 }
1660
1661 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1662
1663 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1664 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1665 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1666 rtnl_unlock();
1667 return -EINVAL;
1668 }
1669
1670 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1671 if (rx_sa) {
1672 rtnl_unlock();
1673 return -EBUSY;
1674 }
1675
1676 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1677 if (!rx_sa) {
1678 rtnl_unlock();
1679 return -ENOMEM;
1680 }
1681
1682 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1683 secy->key_len, secy->icv_len);
1684 if (err < 0) {
1685 kfree(rx_sa);
1686 rtnl_unlock();
1687 return err;
1688 }
1689
1690 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1691 spin_lock_bh(&rx_sa->lock);
1692 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1693 spin_unlock_bh(&rx_sa->lock);
1694 }
1695
1696 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1697 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1698
1699 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1700 rx_sa->sc = rx_sc;
1701 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1702
1703 rtnl_unlock();
1704
1705 return 0;
1706 }
1707
1708 static bool validate_add_rxsc(struct nlattr **attrs)
1709 {
1710 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1711 return false;
1712
1713 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1714 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1715 return false;
1716 }
1717
1718 return true;
1719 }
1720
1721 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1722 {
1723 struct net_device *dev;
1724 sci_t sci = MACSEC_UNDEF_SCI;
1725 struct nlattr **attrs = info->attrs;
1726 struct macsec_rx_sc *rx_sc;
1727 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1728
1729 if (!attrs[MACSEC_ATTR_IFINDEX])
1730 return -EINVAL;
1731
1732 if (parse_rxsc_config(attrs, tb_rxsc))
1733 return -EINVAL;
1734
1735 if (!validate_add_rxsc(tb_rxsc))
1736 return -EINVAL;
1737
1738 rtnl_lock();
1739 dev = get_dev_from_nl(genl_info_net(info), attrs);
1740 if (IS_ERR(dev)) {
1741 rtnl_unlock();
1742 return PTR_ERR(dev);
1743 }
1744
1745 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1746
1747 rx_sc = create_rx_sc(dev, sci);
1748 if (IS_ERR(rx_sc)) {
1749 rtnl_unlock();
1750 return PTR_ERR(rx_sc);
1751 }
1752
1753 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1754 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1755
1756 rtnl_unlock();
1757
1758 return 0;
1759 }
1760
1761 static bool validate_add_txsa(struct nlattr **attrs)
1762 {
1763 if (!attrs[MACSEC_SA_ATTR_AN] ||
1764 !attrs[MACSEC_SA_ATTR_PN] ||
1765 !attrs[MACSEC_SA_ATTR_KEY] ||
1766 !attrs[MACSEC_SA_ATTR_KEYID])
1767 return false;
1768
1769 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1770 return false;
1771
1772 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1773 return false;
1774
1775 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1776 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1777 return false;
1778 }
1779
1780 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1781 return false;
1782
1783 return true;
1784 }
1785
1786 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1787 {
1788 struct net_device *dev;
1789 struct nlattr **attrs = info->attrs;
1790 struct macsec_secy *secy;
1791 struct macsec_tx_sc *tx_sc;
1792 struct macsec_tx_sa *tx_sa;
1793 unsigned char assoc_num;
1794 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1795 int err;
1796
1797 if (!attrs[MACSEC_ATTR_IFINDEX])
1798 return -EINVAL;
1799
1800 if (parse_sa_config(attrs, tb_sa))
1801 return -EINVAL;
1802
1803 if (!validate_add_txsa(tb_sa))
1804 return -EINVAL;
1805
1806 rtnl_lock();
1807 dev = get_dev_from_nl(genl_info_net(info), attrs);
1808 if (IS_ERR(dev)) {
1809 rtnl_unlock();
1810 return PTR_ERR(dev);
1811 }
1812
1813 secy = &macsec_priv(dev)->secy;
1814 tx_sc = &secy->tx_sc;
1815
1816 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1817
1818 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1819 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1820 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1821 rtnl_unlock();
1822 return -EINVAL;
1823 }
1824
1825 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1826 if (tx_sa) {
1827 rtnl_unlock();
1828 return -EBUSY;
1829 }
1830
1831 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1832 if (!tx_sa) {
1833 rtnl_unlock();
1834 return -ENOMEM;
1835 }
1836
1837 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1838 secy->key_len, secy->icv_len);
1839 if (err < 0) {
1840 kfree(tx_sa);
1841 rtnl_unlock();
1842 return err;
1843 }
1844
1845 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1846
1847 spin_lock_bh(&tx_sa->lock);
1848 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1849 spin_unlock_bh(&tx_sa->lock);
1850
1851 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1852 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1853
1854 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1855 secy->operational = true;
1856
1857 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1858
1859 rtnl_unlock();
1860
1861 return 0;
1862 }
1863
1864 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1865 {
1866 struct nlattr **attrs = info->attrs;
1867 struct net_device *dev;
1868 struct macsec_secy *secy;
1869 struct macsec_rx_sc *rx_sc;
1870 struct macsec_rx_sa *rx_sa;
1871 u8 assoc_num;
1872 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1873 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1874
1875 if (!attrs[MACSEC_ATTR_IFINDEX])
1876 return -EINVAL;
1877
1878 if (parse_sa_config(attrs, tb_sa))
1879 return -EINVAL;
1880
1881 if (parse_rxsc_config(attrs, tb_rxsc))
1882 return -EINVAL;
1883
1884 rtnl_lock();
1885 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1886 &dev, &secy, &rx_sc, &assoc_num);
1887 if (IS_ERR(rx_sa)) {
1888 rtnl_unlock();
1889 return PTR_ERR(rx_sa);
1890 }
1891
1892 if (rx_sa->active) {
1893 rtnl_unlock();
1894 return -EBUSY;
1895 }
1896
1897 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1898 clear_rx_sa(rx_sa);
1899
1900 rtnl_unlock();
1901
1902 return 0;
1903 }
1904
1905 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1906 {
1907 struct nlattr **attrs = info->attrs;
1908 struct net_device *dev;
1909 struct macsec_secy *secy;
1910 struct macsec_rx_sc *rx_sc;
1911 sci_t sci;
1912 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1913
1914 if (!attrs[MACSEC_ATTR_IFINDEX])
1915 return -EINVAL;
1916
1917 if (parse_rxsc_config(attrs, tb_rxsc))
1918 return -EINVAL;
1919
1920 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1921 return -EINVAL;
1922
1923 rtnl_lock();
1924 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1925 if (IS_ERR(dev)) {
1926 rtnl_unlock();
1927 return PTR_ERR(dev);
1928 }
1929
1930 secy = &macsec_priv(dev)->secy;
1931 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1932
1933 rx_sc = del_rx_sc(secy, sci);
1934 if (!rx_sc) {
1935 rtnl_unlock();
1936 return -ENODEV;
1937 }
1938
1939 free_rx_sc(rx_sc);
1940 rtnl_unlock();
1941
1942 return 0;
1943 }
1944
1945 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1946 {
1947 struct nlattr **attrs = info->attrs;
1948 struct net_device *dev;
1949 struct macsec_secy *secy;
1950 struct macsec_tx_sc *tx_sc;
1951 struct macsec_tx_sa *tx_sa;
1952 u8 assoc_num;
1953 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1954
1955 if (!attrs[MACSEC_ATTR_IFINDEX])
1956 return -EINVAL;
1957
1958 if (parse_sa_config(attrs, tb_sa))
1959 return -EINVAL;
1960
1961 rtnl_lock();
1962 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1963 &dev, &secy, &tx_sc, &assoc_num);
1964 if (IS_ERR(tx_sa)) {
1965 rtnl_unlock();
1966 return PTR_ERR(tx_sa);
1967 }
1968
1969 if (tx_sa->active) {
1970 rtnl_unlock();
1971 return -EBUSY;
1972 }
1973
1974 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
1975 clear_tx_sa(tx_sa);
1976
1977 rtnl_unlock();
1978
1979 return 0;
1980 }
1981
1982 static bool validate_upd_sa(struct nlattr **attrs)
1983 {
1984 if (!attrs[MACSEC_SA_ATTR_AN] ||
1985 attrs[MACSEC_SA_ATTR_KEY] ||
1986 attrs[MACSEC_SA_ATTR_KEYID])
1987 return false;
1988
1989 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1990 return false;
1991
1992 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1993 return false;
1994
1995 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1996 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1997 return false;
1998 }
1999
2000 return true;
2001 }
2002
2003 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2004 {
2005 struct nlattr **attrs = info->attrs;
2006 struct net_device *dev;
2007 struct macsec_secy *secy;
2008 struct macsec_tx_sc *tx_sc;
2009 struct macsec_tx_sa *tx_sa;
2010 u8 assoc_num;
2011 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2012
2013 if (!attrs[MACSEC_ATTR_IFINDEX])
2014 return -EINVAL;
2015
2016 if (parse_sa_config(attrs, tb_sa))
2017 return -EINVAL;
2018
2019 if (!validate_upd_sa(tb_sa))
2020 return -EINVAL;
2021
2022 rtnl_lock();
2023 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2024 &dev, &secy, &tx_sc, &assoc_num);
2025 if (IS_ERR(tx_sa)) {
2026 rtnl_unlock();
2027 return PTR_ERR(tx_sa);
2028 }
2029
2030 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2031 spin_lock_bh(&tx_sa->lock);
2032 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2033 spin_unlock_bh(&tx_sa->lock);
2034 }
2035
2036 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2037 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2038
2039 if (assoc_num == tx_sc->encoding_sa)
2040 secy->operational = tx_sa->active;
2041
2042 rtnl_unlock();
2043
2044 return 0;
2045 }
2046
2047 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2048 {
2049 struct nlattr **attrs = info->attrs;
2050 struct net_device *dev;
2051 struct macsec_secy *secy;
2052 struct macsec_rx_sc *rx_sc;
2053 struct macsec_rx_sa *rx_sa;
2054 u8 assoc_num;
2055 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2056 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2057
2058 if (!attrs[MACSEC_ATTR_IFINDEX])
2059 return -EINVAL;
2060
2061 if (parse_rxsc_config(attrs, tb_rxsc))
2062 return -EINVAL;
2063
2064 if (parse_sa_config(attrs, tb_sa))
2065 return -EINVAL;
2066
2067 if (!validate_upd_sa(tb_sa))
2068 return -EINVAL;
2069
2070 rtnl_lock();
2071 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2072 &dev, &secy, &rx_sc, &assoc_num);
2073 if (IS_ERR(rx_sa)) {
2074 rtnl_unlock();
2075 return PTR_ERR(rx_sa);
2076 }
2077
2078 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2079 spin_lock_bh(&rx_sa->lock);
2080 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2081 spin_unlock_bh(&rx_sa->lock);
2082 }
2083
2084 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2085 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2086
2087 rtnl_unlock();
2088 return 0;
2089 }
2090
2091 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2092 {
2093 struct nlattr **attrs = info->attrs;
2094 struct net_device *dev;
2095 struct macsec_secy *secy;
2096 struct macsec_rx_sc *rx_sc;
2097 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2098
2099 if (!attrs[MACSEC_ATTR_IFINDEX])
2100 return -EINVAL;
2101
2102 if (parse_rxsc_config(attrs, tb_rxsc))
2103 return -EINVAL;
2104
2105 if (!validate_add_rxsc(tb_rxsc))
2106 return -EINVAL;
2107
2108 rtnl_lock();
2109 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2110 if (IS_ERR(rx_sc)) {
2111 rtnl_unlock();
2112 return PTR_ERR(rx_sc);
2113 }
2114
2115 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2116 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2117
2118 if (rx_sc->active != new)
2119 secy->n_rx_sc += new ? 1 : -1;
2120
2121 rx_sc->active = new;
2122 }
2123
2124 rtnl_unlock();
2125
2126 return 0;
2127 }
2128
2129 static int copy_tx_sa_stats(struct sk_buff *skb,
2130 struct macsec_tx_sa_stats __percpu *pstats)
2131 {
2132 struct macsec_tx_sa_stats sum = {0, };
2133 int cpu;
2134
2135 for_each_possible_cpu(cpu) {
2136 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2137
2138 sum.OutPktsProtected += stats->OutPktsProtected;
2139 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2140 }
2141
2142 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2143 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2144 return -EMSGSIZE;
2145
2146 return 0;
2147 }
2148
2149 static int copy_rx_sa_stats(struct sk_buff *skb,
2150 struct macsec_rx_sa_stats __percpu *pstats)
2151 {
2152 struct macsec_rx_sa_stats sum = {0, };
2153 int cpu;
2154
2155 for_each_possible_cpu(cpu) {
2156 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2157
2158 sum.InPktsOK += stats->InPktsOK;
2159 sum.InPktsInvalid += stats->InPktsInvalid;
2160 sum.InPktsNotValid += stats->InPktsNotValid;
2161 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2162 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2163 }
2164
2165 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2166 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2167 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2168 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2169 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2170 return -EMSGSIZE;
2171
2172 return 0;
2173 }
2174
2175 static int copy_rx_sc_stats(struct sk_buff *skb,
2176 struct pcpu_rx_sc_stats __percpu *pstats)
2177 {
2178 struct macsec_rx_sc_stats sum = {0, };
2179 int cpu;
2180
2181 for_each_possible_cpu(cpu) {
2182 const struct pcpu_rx_sc_stats *stats;
2183 struct macsec_rx_sc_stats tmp;
2184 unsigned int start;
2185
2186 stats = per_cpu_ptr(pstats, cpu);
2187 do {
2188 start = u64_stats_fetch_begin_irq(&stats->syncp);
2189 memcpy(&tmp, &stats->stats, sizeof(tmp));
2190 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2191
2192 sum.InOctetsValidated += tmp.InOctetsValidated;
2193 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2194 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2195 sum.InPktsDelayed += tmp.InPktsDelayed;
2196 sum.InPktsOK += tmp.InPktsOK;
2197 sum.InPktsInvalid += tmp.InPktsInvalid;
2198 sum.InPktsLate += tmp.InPktsLate;
2199 sum.InPktsNotValid += tmp.InPktsNotValid;
2200 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2201 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2202 }
2203
2204 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2205 sum.InOctetsValidated,
2206 MACSEC_RXSC_STATS_ATTR_PAD) ||
2207 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2208 sum.InOctetsDecrypted,
2209 MACSEC_RXSC_STATS_ATTR_PAD) ||
2210 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2211 sum.InPktsUnchecked,
2212 MACSEC_RXSC_STATS_ATTR_PAD) ||
2213 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2214 sum.InPktsDelayed,
2215 MACSEC_RXSC_STATS_ATTR_PAD) ||
2216 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2217 sum.InPktsOK,
2218 MACSEC_RXSC_STATS_ATTR_PAD) ||
2219 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2220 sum.InPktsInvalid,
2221 MACSEC_RXSC_STATS_ATTR_PAD) ||
2222 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2223 sum.InPktsLate,
2224 MACSEC_RXSC_STATS_ATTR_PAD) ||
2225 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2226 sum.InPktsNotValid,
2227 MACSEC_RXSC_STATS_ATTR_PAD) ||
2228 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2229 sum.InPktsNotUsingSA,
2230 MACSEC_RXSC_STATS_ATTR_PAD) ||
2231 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2232 sum.InPktsUnusedSA,
2233 MACSEC_RXSC_STATS_ATTR_PAD))
2234 return -EMSGSIZE;
2235
2236 return 0;
2237 }
2238
2239 static int copy_tx_sc_stats(struct sk_buff *skb,
2240 struct pcpu_tx_sc_stats __percpu *pstats)
2241 {
2242 struct macsec_tx_sc_stats sum = {0, };
2243 int cpu;
2244
2245 for_each_possible_cpu(cpu) {
2246 const struct pcpu_tx_sc_stats *stats;
2247 struct macsec_tx_sc_stats tmp;
2248 unsigned int start;
2249
2250 stats = per_cpu_ptr(pstats, cpu);
2251 do {
2252 start = u64_stats_fetch_begin_irq(&stats->syncp);
2253 memcpy(&tmp, &stats->stats, sizeof(tmp));
2254 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2255
2256 sum.OutPktsProtected += tmp.OutPktsProtected;
2257 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2258 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2259 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2260 }
2261
2262 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2263 sum.OutPktsProtected,
2264 MACSEC_TXSC_STATS_ATTR_PAD) ||
2265 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2266 sum.OutPktsEncrypted,
2267 MACSEC_TXSC_STATS_ATTR_PAD) ||
2268 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2269 sum.OutOctetsProtected,
2270 MACSEC_TXSC_STATS_ATTR_PAD) ||
2271 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2272 sum.OutOctetsEncrypted,
2273 MACSEC_TXSC_STATS_ATTR_PAD))
2274 return -EMSGSIZE;
2275
2276 return 0;
2277 }
2278
2279 static int copy_secy_stats(struct sk_buff *skb,
2280 struct pcpu_secy_stats __percpu *pstats)
2281 {
2282 struct macsec_dev_stats sum = {0, };
2283 int cpu;
2284
2285 for_each_possible_cpu(cpu) {
2286 const struct pcpu_secy_stats *stats;
2287 struct macsec_dev_stats tmp;
2288 unsigned int start;
2289
2290 stats = per_cpu_ptr(pstats, cpu);
2291 do {
2292 start = u64_stats_fetch_begin_irq(&stats->syncp);
2293 memcpy(&tmp, &stats->stats, sizeof(tmp));
2294 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2295
2296 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2297 sum.InPktsUntagged += tmp.InPktsUntagged;
2298 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2299 sum.InPktsNoTag += tmp.InPktsNoTag;
2300 sum.InPktsBadTag += tmp.InPktsBadTag;
2301 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2302 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2303 sum.InPktsOverrun += tmp.InPktsOverrun;
2304 }
2305
2306 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2307 sum.OutPktsUntagged,
2308 MACSEC_SECY_STATS_ATTR_PAD) ||
2309 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2310 sum.InPktsUntagged,
2311 MACSEC_SECY_STATS_ATTR_PAD) ||
2312 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2313 sum.OutPktsTooLong,
2314 MACSEC_SECY_STATS_ATTR_PAD) ||
2315 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2316 sum.InPktsNoTag,
2317 MACSEC_SECY_STATS_ATTR_PAD) ||
2318 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2319 sum.InPktsBadTag,
2320 MACSEC_SECY_STATS_ATTR_PAD) ||
2321 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2322 sum.InPktsUnknownSCI,
2323 MACSEC_SECY_STATS_ATTR_PAD) ||
2324 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2325 sum.InPktsNoSCI,
2326 MACSEC_SECY_STATS_ATTR_PAD) ||
2327 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2328 sum.InPktsOverrun,
2329 MACSEC_SECY_STATS_ATTR_PAD))
2330 return -EMSGSIZE;
2331
2332 return 0;
2333 }
2334
2335 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2336 {
2337 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2338 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2339
2340 if (!secy_nest)
2341 return 1;
2342
2343 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2344 MACSEC_SECY_ATTR_PAD) ||
2345 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2346 MACSEC_DEFAULT_CIPHER_ID,
2347 MACSEC_SECY_ATTR_PAD) ||
2348 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2349 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2350 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2351 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2352 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2353 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2354 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2355 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2356 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2357 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2358 goto cancel;
2359
2360 if (secy->replay_protect) {
2361 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2362 goto cancel;
2363 }
2364
2365 nla_nest_end(skb, secy_nest);
2366 return 0;
2367
2368 cancel:
2369 nla_nest_cancel(skb, secy_nest);
2370 return 1;
2371 }
2372
2373 static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2374 struct sk_buff *skb, struct netlink_callback *cb)
2375 {
2376 struct macsec_rx_sc *rx_sc;
2377 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2378 struct nlattr *txsa_list, *rxsc_list;
2379 int i, j;
2380 void *hdr;
2381 struct nlattr *attr;
2382
2383 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2384 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2385 if (!hdr)
2386 return -EMSGSIZE;
2387
2388 genl_dump_check_consistent(cb, hdr, &macsec_fam);
2389
2390 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2391 goto nla_put_failure;
2392
2393 if (nla_put_secy(secy, skb))
2394 goto nla_put_failure;
2395
2396 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2397 if (!attr)
2398 goto nla_put_failure;
2399 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2400 nla_nest_cancel(skb, attr);
2401 goto nla_put_failure;
2402 }
2403 nla_nest_end(skb, attr);
2404
2405 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2406 if (!attr)
2407 goto nla_put_failure;
2408 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2409 nla_nest_cancel(skb, attr);
2410 goto nla_put_failure;
2411 }
2412 nla_nest_end(skb, attr);
2413
2414 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2415 if (!txsa_list)
2416 goto nla_put_failure;
2417 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2418 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2419 struct nlattr *txsa_nest;
2420
2421 if (!tx_sa)
2422 continue;
2423
2424 txsa_nest = nla_nest_start(skb, j++);
2425 if (!txsa_nest) {
2426 nla_nest_cancel(skb, txsa_list);
2427 goto nla_put_failure;
2428 }
2429
2430 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2431 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2432 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2433 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2434 nla_nest_cancel(skb, txsa_nest);
2435 nla_nest_cancel(skb, txsa_list);
2436 goto nla_put_failure;
2437 }
2438
2439 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2440 if (!attr) {
2441 nla_nest_cancel(skb, txsa_nest);
2442 nla_nest_cancel(skb, txsa_list);
2443 goto nla_put_failure;
2444 }
2445 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2446 nla_nest_cancel(skb, attr);
2447 nla_nest_cancel(skb, txsa_nest);
2448 nla_nest_cancel(skb, txsa_list);
2449 goto nla_put_failure;
2450 }
2451 nla_nest_end(skb, attr);
2452
2453 nla_nest_end(skb, txsa_nest);
2454 }
2455 nla_nest_end(skb, txsa_list);
2456
2457 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2458 if (!rxsc_list)
2459 goto nla_put_failure;
2460
2461 j = 1;
2462 for_each_rxsc_rtnl(secy, rx_sc) {
2463 int k;
2464 struct nlattr *rxsa_list;
2465 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2466
2467 if (!rxsc_nest) {
2468 nla_nest_cancel(skb, rxsc_list);
2469 goto nla_put_failure;
2470 }
2471
2472 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2473 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
2474 MACSEC_RXSC_ATTR_PAD)) {
2475 nla_nest_cancel(skb, rxsc_nest);
2476 nla_nest_cancel(skb, rxsc_list);
2477 goto nla_put_failure;
2478 }
2479
2480 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2481 if (!attr) {
2482 nla_nest_cancel(skb, rxsc_nest);
2483 nla_nest_cancel(skb, rxsc_list);
2484 goto nla_put_failure;
2485 }
2486 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2487 nla_nest_cancel(skb, attr);
2488 nla_nest_cancel(skb, rxsc_nest);
2489 nla_nest_cancel(skb, rxsc_list);
2490 goto nla_put_failure;
2491 }
2492 nla_nest_end(skb, attr);
2493
2494 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2495 if (!rxsa_list) {
2496 nla_nest_cancel(skb, rxsc_nest);
2497 nla_nest_cancel(skb, rxsc_list);
2498 goto nla_put_failure;
2499 }
2500
2501 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2502 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2503 struct nlattr *rxsa_nest;
2504
2505 if (!rx_sa)
2506 continue;
2507
2508 rxsa_nest = nla_nest_start(skb, k++);
2509 if (!rxsa_nest) {
2510 nla_nest_cancel(skb, rxsa_list);
2511 nla_nest_cancel(skb, rxsc_nest);
2512 nla_nest_cancel(skb, rxsc_list);
2513 goto nla_put_failure;
2514 }
2515
2516 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2517 if (!attr) {
2518 nla_nest_cancel(skb, rxsa_list);
2519 nla_nest_cancel(skb, rxsc_nest);
2520 nla_nest_cancel(skb, rxsc_list);
2521 goto nla_put_failure;
2522 }
2523 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2524 nla_nest_cancel(skb, attr);
2525 nla_nest_cancel(skb, rxsa_list);
2526 nla_nest_cancel(skb, rxsc_nest);
2527 nla_nest_cancel(skb, rxsc_list);
2528 goto nla_put_failure;
2529 }
2530 nla_nest_end(skb, attr);
2531
2532 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2533 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2534 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2535 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2536 nla_nest_cancel(skb, rxsa_nest);
2537 nla_nest_cancel(skb, rxsc_nest);
2538 nla_nest_cancel(skb, rxsc_list);
2539 goto nla_put_failure;
2540 }
2541 nla_nest_end(skb, rxsa_nest);
2542 }
2543
2544 nla_nest_end(skb, rxsa_list);
2545 nla_nest_end(skb, rxsc_nest);
2546 }
2547
2548 nla_nest_end(skb, rxsc_list);
2549
2550 genlmsg_end(skb, hdr);
2551
2552 return 0;
2553
2554 nla_put_failure:
2555 genlmsg_cancel(skb, hdr);
2556 return -EMSGSIZE;
2557 }
2558
2559 static int macsec_generation = 1; /* protected by RTNL */
2560
2561 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2562 {
2563 struct net *net = sock_net(skb->sk);
2564 struct net_device *dev;
2565 int dev_idx, d;
2566
2567 dev_idx = cb->args[0];
2568
2569 d = 0;
2570 rtnl_lock();
2571
2572 cb->seq = macsec_generation;
2573
2574 for_each_netdev(net, dev) {
2575 struct macsec_secy *secy;
2576
2577 if (d < dev_idx)
2578 goto next;
2579
2580 if (!netif_is_macsec(dev))
2581 goto next;
2582
2583 secy = &macsec_priv(dev)->secy;
2584 if (dump_secy(secy, dev, skb, cb) < 0)
2585 goto done;
2586 next:
2587 d++;
2588 }
2589
2590 done:
2591 rtnl_unlock();
2592 cb->args[0] = d;
2593 return skb->len;
2594 }
2595
2596 static const struct genl_ops macsec_genl_ops[] = {
2597 {
2598 .cmd = MACSEC_CMD_GET_TXSC,
2599 .dumpit = macsec_dump_txsc,
2600 .policy = macsec_genl_policy,
2601 },
2602 {
2603 .cmd = MACSEC_CMD_ADD_RXSC,
2604 .doit = macsec_add_rxsc,
2605 .policy = macsec_genl_policy,
2606 .flags = GENL_ADMIN_PERM,
2607 },
2608 {
2609 .cmd = MACSEC_CMD_DEL_RXSC,
2610 .doit = macsec_del_rxsc,
2611 .policy = macsec_genl_policy,
2612 .flags = GENL_ADMIN_PERM,
2613 },
2614 {
2615 .cmd = MACSEC_CMD_UPD_RXSC,
2616 .doit = macsec_upd_rxsc,
2617 .policy = macsec_genl_policy,
2618 .flags = GENL_ADMIN_PERM,
2619 },
2620 {
2621 .cmd = MACSEC_CMD_ADD_TXSA,
2622 .doit = macsec_add_txsa,
2623 .policy = macsec_genl_policy,
2624 .flags = GENL_ADMIN_PERM,
2625 },
2626 {
2627 .cmd = MACSEC_CMD_DEL_TXSA,
2628 .doit = macsec_del_txsa,
2629 .policy = macsec_genl_policy,
2630 .flags = GENL_ADMIN_PERM,
2631 },
2632 {
2633 .cmd = MACSEC_CMD_UPD_TXSA,
2634 .doit = macsec_upd_txsa,
2635 .policy = macsec_genl_policy,
2636 .flags = GENL_ADMIN_PERM,
2637 },
2638 {
2639 .cmd = MACSEC_CMD_ADD_RXSA,
2640 .doit = macsec_add_rxsa,
2641 .policy = macsec_genl_policy,
2642 .flags = GENL_ADMIN_PERM,
2643 },
2644 {
2645 .cmd = MACSEC_CMD_DEL_RXSA,
2646 .doit = macsec_del_rxsa,
2647 .policy = macsec_genl_policy,
2648 .flags = GENL_ADMIN_PERM,
2649 },
2650 {
2651 .cmd = MACSEC_CMD_UPD_RXSA,
2652 .doit = macsec_upd_rxsa,
2653 .policy = macsec_genl_policy,
2654 .flags = GENL_ADMIN_PERM,
2655 },
2656 };
2657
2658 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2659 struct net_device *dev)
2660 {
2661 struct macsec_dev *macsec = netdev_priv(dev);
2662 struct macsec_secy *secy = &macsec->secy;
2663 struct pcpu_secy_stats *secy_stats;
2664 int ret, len;
2665
2666 /* 10.5 */
2667 if (!secy->protect_frames) {
2668 secy_stats = this_cpu_ptr(macsec->stats);
2669 u64_stats_update_begin(&secy_stats->syncp);
2670 secy_stats->stats.OutPktsUntagged++;
2671 u64_stats_update_end(&secy_stats->syncp);
2672 skb->dev = macsec->real_dev;
2673 len = skb->len;
2674 ret = dev_queue_xmit(skb);
2675 count_tx(dev, ret, len);
2676 return ret;
2677 }
2678
2679 if (!secy->operational) {
2680 kfree_skb(skb);
2681 dev->stats.tx_dropped++;
2682 return NETDEV_TX_OK;
2683 }
2684
2685 skb = macsec_encrypt(skb, dev);
2686 if (IS_ERR(skb)) {
2687 if (PTR_ERR(skb) != -EINPROGRESS)
2688 dev->stats.tx_dropped++;
2689 return NETDEV_TX_OK;
2690 }
2691
2692 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2693
2694 macsec_encrypt_finish(skb, dev);
2695 len = skb->len;
2696 ret = dev_queue_xmit(skb);
2697 count_tx(dev, ret, len);
2698 return ret;
2699 }
2700
2701 #define MACSEC_FEATURES \
2702 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2703 static struct lock_class_key macsec_netdev_addr_lock_key;
2704
2705 static int macsec_dev_init(struct net_device *dev)
2706 {
2707 struct macsec_dev *macsec = macsec_priv(dev);
2708 struct net_device *real_dev = macsec->real_dev;
2709 int err;
2710
2711 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2712 if (!dev->tstats)
2713 return -ENOMEM;
2714
2715 err = gro_cells_init(&macsec->gro_cells, dev);
2716 if (err) {
2717 free_percpu(dev->tstats);
2718 return err;
2719 }
2720
2721 dev->features = real_dev->features & MACSEC_FEATURES;
2722 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2723
2724 dev->needed_headroom = real_dev->needed_headroom +
2725 MACSEC_NEEDED_HEADROOM;
2726 dev->needed_tailroom = real_dev->needed_tailroom +
2727 MACSEC_NEEDED_TAILROOM;
2728
2729 if (is_zero_ether_addr(dev->dev_addr))
2730 eth_hw_addr_inherit(dev, real_dev);
2731 if (is_zero_ether_addr(dev->broadcast))
2732 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2733
2734 return 0;
2735 }
2736
2737 static void macsec_dev_uninit(struct net_device *dev)
2738 {
2739 struct macsec_dev *macsec = macsec_priv(dev);
2740
2741 gro_cells_destroy(&macsec->gro_cells);
2742 free_percpu(dev->tstats);
2743 }
2744
2745 static netdev_features_t macsec_fix_features(struct net_device *dev,
2746 netdev_features_t features)
2747 {
2748 struct macsec_dev *macsec = macsec_priv(dev);
2749 struct net_device *real_dev = macsec->real_dev;
2750
2751 features &= (real_dev->features & MACSEC_FEATURES) |
2752 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
2753 features |= NETIF_F_LLTX;
2754
2755 return features;
2756 }
2757
2758 static int macsec_dev_open(struct net_device *dev)
2759 {
2760 struct macsec_dev *macsec = macsec_priv(dev);
2761 struct net_device *real_dev = macsec->real_dev;
2762 int err;
2763
2764 if (!(real_dev->flags & IFF_UP))
2765 return -ENETDOWN;
2766
2767 err = dev_uc_add(real_dev, dev->dev_addr);
2768 if (err < 0)
2769 return err;
2770
2771 if (dev->flags & IFF_ALLMULTI) {
2772 err = dev_set_allmulti(real_dev, 1);
2773 if (err < 0)
2774 goto del_unicast;
2775 }
2776
2777 if (dev->flags & IFF_PROMISC) {
2778 err = dev_set_promiscuity(real_dev, 1);
2779 if (err < 0)
2780 goto clear_allmulti;
2781 }
2782
2783 if (netif_carrier_ok(real_dev))
2784 netif_carrier_on(dev);
2785
2786 return 0;
2787 clear_allmulti:
2788 if (dev->flags & IFF_ALLMULTI)
2789 dev_set_allmulti(real_dev, -1);
2790 del_unicast:
2791 dev_uc_del(real_dev, dev->dev_addr);
2792 netif_carrier_off(dev);
2793 return err;
2794 }
2795
2796 static int macsec_dev_stop(struct net_device *dev)
2797 {
2798 struct macsec_dev *macsec = macsec_priv(dev);
2799 struct net_device *real_dev = macsec->real_dev;
2800
2801 netif_carrier_off(dev);
2802
2803 dev_mc_unsync(real_dev, dev);
2804 dev_uc_unsync(real_dev, dev);
2805
2806 if (dev->flags & IFF_ALLMULTI)
2807 dev_set_allmulti(real_dev, -1);
2808
2809 if (dev->flags & IFF_PROMISC)
2810 dev_set_promiscuity(real_dev, -1);
2811
2812 dev_uc_del(real_dev, dev->dev_addr);
2813
2814 return 0;
2815 }
2816
2817 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2818 {
2819 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2820
2821 if (!(dev->flags & IFF_UP))
2822 return;
2823
2824 if (change & IFF_ALLMULTI)
2825 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2826
2827 if (change & IFF_PROMISC)
2828 dev_set_promiscuity(real_dev,
2829 dev->flags & IFF_PROMISC ? 1 : -1);
2830 }
2831
2832 static void macsec_dev_set_rx_mode(struct net_device *dev)
2833 {
2834 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2835
2836 dev_mc_sync(real_dev, dev);
2837 dev_uc_sync(real_dev, dev);
2838 }
2839
2840 static int macsec_set_mac_address(struct net_device *dev, void *p)
2841 {
2842 struct macsec_dev *macsec = macsec_priv(dev);
2843 struct net_device *real_dev = macsec->real_dev;
2844 struct sockaddr *addr = p;
2845 int err;
2846
2847 if (!is_valid_ether_addr(addr->sa_data))
2848 return -EADDRNOTAVAIL;
2849
2850 if (!(dev->flags & IFF_UP))
2851 goto out;
2852
2853 err = dev_uc_add(real_dev, addr->sa_data);
2854 if (err < 0)
2855 return err;
2856
2857 dev_uc_del(real_dev, dev->dev_addr);
2858
2859 out:
2860 ether_addr_copy(dev->dev_addr, addr->sa_data);
2861 return 0;
2862 }
2863
2864 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2865 {
2866 struct macsec_dev *macsec = macsec_priv(dev);
2867 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2868
2869 if (macsec->real_dev->mtu - extra < new_mtu)
2870 return -ERANGE;
2871
2872 dev->mtu = new_mtu;
2873
2874 return 0;
2875 }
2876
2877 static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev,
2878 struct rtnl_link_stats64 *s)
2879 {
2880 int cpu;
2881
2882 if (!dev->tstats)
2883 return s;
2884
2885 for_each_possible_cpu(cpu) {
2886 struct pcpu_sw_netstats *stats;
2887 struct pcpu_sw_netstats tmp;
2888 int start;
2889
2890 stats = per_cpu_ptr(dev->tstats, cpu);
2891 do {
2892 start = u64_stats_fetch_begin_irq(&stats->syncp);
2893 tmp.rx_packets = stats->rx_packets;
2894 tmp.rx_bytes = stats->rx_bytes;
2895 tmp.tx_packets = stats->tx_packets;
2896 tmp.tx_bytes = stats->tx_bytes;
2897 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2898
2899 s->rx_packets += tmp.rx_packets;
2900 s->rx_bytes += tmp.rx_bytes;
2901 s->tx_packets += tmp.tx_packets;
2902 s->tx_bytes += tmp.tx_bytes;
2903 }
2904
2905 s->rx_dropped = dev->stats.rx_dropped;
2906 s->tx_dropped = dev->stats.tx_dropped;
2907
2908 return s;
2909 }
2910
2911 static int macsec_get_iflink(const struct net_device *dev)
2912 {
2913 return macsec_priv(dev)->real_dev->ifindex;
2914 }
2915
2916
2917 static int macsec_get_nest_level(struct net_device *dev)
2918 {
2919 return macsec_priv(dev)->nest_level;
2920 }
2921
2922
2923 static const struct net_device_ops macsec_netdev_ops = {
2924 .ndo_init = macsec_dev_init,
2925 .ndo_uninit = macsec_dev_uninit,
2926 .ndo_open = macsec_dev_open,
2927 .ndo_stop = macsec_dev_stop,
2928 .ndo_fix_features = macsec_fix_features,
2929 .ndo_change_mtu = macsec_change_mtu,
2930 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2931 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2932 .ndo_set_mac_address = macsec_set_mac_address,
2933 .ndo_start_xmit = macsec_start_xmit,
2934 .ndo_get_stats64 = macsec_get_stats64,
2935 .ndo_get_iflink = macsec_get_iflink,
2936 .ndo_get_lock_subclass = macsec_get_nest_level,
2937 };
2938
2939 static const struct device_type macsec_type = {
2940 .name = "macsec",
2941 };
2942
2943 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2944 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2945 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2946 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2947 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2948 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2949 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2950 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
2951 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
2952 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
2953 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
2954 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
2955 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
2956 };
2957
2958 static void macsec_free_netdev(struct net_device *dev)
2959 {
2960 struct macsec_dev *macsec = macsec_priv(dev);
2961 struct net_device *real_dev = macsec->real_dev;
2962
2963 free_percpu(macsec->stats);
2964 free_percpu(macsec->secy.tx_sc.stats);
2965
2966 dev_put(real_dev);
2967 free_netdev(dev);
2968 }
2969
2970 static void macsec_setup(struct net_device *dev)
2971 {
2972 ether_setup(dev);
2973 dev->priv_flags |= IFF_NO_QUEUE;
2974 dev->netdev_ops = &macsec_netdev_ops;
2975 dev->destructor = macsec_free_netdev;
2976 SET_NETDEV_DEVTYPE(dev, &macsec_type);
2977
2978 eth_zero_addr(dev->broadcast);
2979 }
2980
2981 static void macsec_changelink_common(struct net_device *dev,
2982 struct nlattr *data[])
2983 {
2984 struct macsec_secy *secy;
2985 struct macsec_tx_sc *tx_sc;
2986
2987 secy = &macsec_priv(dev)->secy;
2988 tx_sc = &secy->tx_sc;
2989
2990 if (data[IFLA_MACSEC_ENCODING_SA]) {
2991 struct macsec_tx_sa *tx_sa;
2992
2993 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
2994 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
2995
2996 secy->operational = tx_sa && tx_sa->active;
2997 }
2998
2999 if (data[IFLA_MACSEC_WINDOW])
3000 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3001
3002 if (data[IFLA_MACSEC_ENCRYPT])
3003 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3004
3005 if (data[IFLA_MACSEC_PROTECT])
3006 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3007
3008 if (data[IFLA_MACSEC_INC_SCI])
3009 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3010
3011 if (data[IFLA_MACSEC_ES])
3012 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3013
3014 if (data[IFLA_MACSEC_SCB])
3015 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3016
3017 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3018 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3019
3020 if (data[IFLA_MACSEC_VALIDATION])
3021 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3022 }
3023
3024 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3025 struct nlattr *data[])
3026 {
3027 if (!data)
3028 return 0;
3029
3030 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3031 data[IFLA_MACSEC_ICV_LEN] ||
3032 data[IFLA_MACSEC_SCI] ||
3033 data[IFLA_MACSEC_PORT])
3034 return -EINVAL;
3035
3036 macsec_changelink_common(dev, data);
3037
3038 return 0;
3039 }
3040
3041 static void macsec_del_dev(struct macsec_dev *macsec)
3042 {
3043 int i;
3044
3045 while (macsec->secy.rx_sc) {
3046 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3047
3048 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3049 free_rx_sc(rx_sc);
3050 }
3051
3052 for (i = 0; i < MACSEC_NUM_AN; i++) {
3053 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3054
3055 if (sa) {
3056 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3057 clear_tx_sa(sa);
3058 }
3059 }
3060 }
3061
3062 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3063 {
3064 struct macsec_dev *macsec = macsec_priv(dev);
3065 struct net_device *real_dev = macsec->real_dev;
3066
3067 unregister_netdevice_queue(dev, head);
3068 list_del_rcu(&macsec->secys);
3069 macsec_del_dev(macsec);
3070 netdev_upper_dev_unlink(real_dev, dev);
3071
3072 macsec_generation++;
3073 }
3074
3075 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3076 {
3077 struct macsec_dev *macsec = macsec_priv(dev);
3078 struct net_device *real_dev = macsec->real_dev;
3079 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3080
3081 macsec_common_dellink(dev, head);
3082
3083 if (list_empty(&rxd->secys)) {
3084 netdev_rx_handler_unregister(real_dev);
3085 kfree(rxd);
3086 }
3087 }
3088
3089 static int register_macsec_dev(struct net_device *real_dev,
3090 struct net_device *dev)
3091 {
3092 struct macsec_dev *macsec = macsec_priv(dev);
3093 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3094
3095 if (!rxd) {
3096 int err;
3097
3098 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3099 if (!rxd)
3100 return -ENOMEM;
3101
3102 INIT_LIST_HEAD(&rxd->secys);
3103
3104 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3105 rxd);
3106 if (err < 0) {
3107 kfree(rxd);
3108 return err;
3109 }
3110 }
3111
3112 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3113 return 0;
3114 }
3115
3116 static bool sci_exists(struct net_device *dev, sci_t sci)
3117 {
3118 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3119 struct macsec_dev *macsec;
3120
3121 list_for_each_entry(macsec, &rxd->secys, secys) {
3122 if (macsec->secy.sci == sci)
3123 return true;
3124 }
3125
3126 return false;
3127 }
3128
3129 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3130 {
3131 return make_sci(dev->dev_addr, port);
3132 }
3133
3134 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3135 {
3136 struct macsec_dev *macsec = macsec_priv(dev);
3137 struct macsec_secy *secy = &macsec->secy;
3138
3139 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3140 if (!macsec->stats)
3141 return -ENOMEM;
3142
3143 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3144 if (!secy->tx_sc.stats) {
3145 free_percpu(macsec->stats);
3146 return -ENOMEM;
3147 }
3148
3149 if (sci == MACSEC_UNDEF_SCI)
3150 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3151
3152 secy->netdev = dev;
3153 secy->operational = true;
3154 secy->key_len = DEFAULT_SAK_LEN;
3155 secy->icv_len = icv_len;
3156 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3157 secy->protect_frames = true;
3158 secy->replay_protect = false;
3159
3160 secy->sci = sci;
3161 secy->tx_sc.active = true;
3162 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3163 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3164 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3165 secy->tx_sc.end_station = false;
3166 secy->tx_sc.scb = false;
3167
3168 return 0;
3169 }
3170
3171 static int macsec_newlink(struct net *net, struct net_device *dev,
3172 struct nlattr *tb[], struct nlattr *data[])
3173 {
3174 struct macsec_dev *macsec = macsec_priv(dev);
3175 struct net_device *real_dev;
3176 int err;
3177 sci_t sci;
3178 u8 icv_len = DEFAULT_ICV_LEN;
3179 rx_handler_func_t *rx_handler;
3180
3181 if (!tb[IFLA_LINK])
3182 return -EINVAL;
3183 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3184 if (!real_dev)
3185 return -ENODEV;
3186
3187 dev->priv_flags |= IFF_MACSEC;
3188
3189 macsec->real_dev = real_dev;
3190
3191 if (data && data[IFLA_MACSEC_ICV_LEN])
3192 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3193 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3194
3195 rx_handler = rtnl_dereference(real_dev->rx_handler);
3196 if (rx_handler && rx_handler != macsec_handle_frame)
3197 return -EBUSY;
3198
3199 err = register_netdevice(dev);
3200 if (err < 0)
3201 return err;
3202
3203 dev_hold(real_dev);
3204
3205 macsec->nest_level = dev_get_nest_level(real_dev) + 1;
3206 netdev_lockdep_set_classes(dev);
3207 lockdep_set_class_and_subclass(&dev->addr_list_lock,
3208 &macsec_netdev_addr_lock_key,
3209 macsec_get_nest_level(dev));
3210
3211 err = netdev_upper_dev_link(real_dev, dev);
3212 if (err < 0)
3213 goto unregister;
3214
3215 /* need to be already registered so that ->init has run and
3216 * the MAC addr is set
3217 */
3218 if (data && data[IFLA_MACSEC_SCI])
3219 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3220 else if (data && data[IFLA_MACSEC_PORT])
3221 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3222 else
3223 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3224
3225 if (rx_handler && sci_exists(real_dev, sci)) {
3226 err = -EBUSY;
3227 goto unlink;
3228 }
3229
3230 err = macsec_add_dev(dev, sci, icv_len);
3231 if (err)
3232 goto unlink;
3233
3234 if (data)
3235 macsec_changelink_common(dev, data);
3236
3237 err = register_macsec_dev(real_dev, dev);
3238 if (err < 0)
3239 goto del_dev;
3240
3241 macsec_generation++;
3242
3243 return 0;
3244
3245 del_dev:
3246 macsec_del_dev(macsec);
3247 unlink:
3248 netdev_upper_dev_unlink(real_dev, dev);
3249 unregister:
3250 unregister_netdevice(dev);
3251 return err;
3252 }
3253
3254 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
3255 {
3256 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3257 u8 icv_len = DEFAULT_ICV_LEN;
3258 int flag;
3259 bool es, scb, sci;
3260
3261 if (!data)
3262 return 0;
3263
3264 if (data[IFLA_MACSEC_CIPHER_SUITE])
3265 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3266
3267 if (data[IFLA_MACSEC_ICV_LEN]) {
3268 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3269 if (icv_len != DEFAULT_ICV_LEN) {
3270 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
3271 struct crypto_aead *dummy_tfm;
3272
3273 dummy_tfm = macsec_alloc_tfm(dummy_key,
3274 DEFAULT_SAK_LEN,
3275 icv_len);
3276 if (IS_ERR(dummy_tfm))
3277 return PTR_ERR(dummy_tfm);
3278 crypto_free_aead(dummy_tfm);
3279 }
3280 }
3281
3282 switch (csid) {
3283 case MACSEC_DEFAULT_CIPHER_ID:
3284 case MACSEC_DEFAULT_CIPHER_ALT:
3285 if (icv_len < MACSEC_MIN_ICV_LEN ||
3286 icv_len > MACSEC_STD_ICV_LEN)
3287 return -EINVAL;
3288 break;
3289 default:
3290 return -EINVAL;
3291 }
3292
3293 if (data[IFLA_MACSEC_ENCODING_SA]) {
3294 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3295 return -EINVAL;
3296 }
3297
3298 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3299 flag < IFLA_MACSEC_VALIDATION;
3300 flag++) {
3301 if (data[flag]) {
3302 if (nla_get_u8(data[flag]) > 1)
3303 return -EINVAL;
3304 }
3305 }
3306
3307 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3308 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3309 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3310
3311 if ((sci && (scb || es)) || (scb && es))
3312 return -EINVAL;
3313
3314 if (data[IFLA_MACSEC_VALIDATION] &&
3315 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3316 return -EINVAL;
3317
3318 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3319 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3320 !data[IFLA_MACSEC_WINDOW])
3321 return -EINVAL;
3322
3323 return 0;
3324 }
3325
3326 static struct net *macsec_get_link_net(const struct net_device *dev)
3327 {
3328 return dev_net(macsec_priv(dev)->real_dev);
3329 }
3330
3331 static size_t macsec_get_size(const struct net_device *dev)
3332 {
3333 return 0 +
3334 nla_total_size_64bit(8) + /* SCI */
3335 nla_total_size(1) + /* ICV_LEN */
3336 nla_total_size_64bit(8) + /* CIPHER_SUITE */
3337 nla_total_size(4) + /* WINDOW */
3338 nla_total_size(1) + /* ENCODING_SA */
3339 nla_total_size(1) + /* ENCRYPT */
3340 nla_total_size(1) + /* PROTECT */
3341 nla_total_size(1) + /* INC_SCI */
3342 nla_total_size(1) + /* ES */
3343 nla_total_size(1) + /* SCB */
3344 nla_total_size(1) + /* REPLAY_PROTECT */
3345 nla_total_size(1) + /* VALIDATION */
3346 0;
3347 }
3348
3349 static int macsec_fill_info(struct sk_buff *skb,
3350 const struct net_device *dev)
3351 {
3352 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3353 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3354
3355 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
3356 IFLA_MACSEC_PAD) ||
3357 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3358 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
3359 MACSEC_DEFAULT_CIPHER_ID, IFLA_MACSEC_PAD) ||
3360 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3361 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3362 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3363 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3364 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3365 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3366 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3367 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3368 0)
3369 goto nla_put_failure;
3370
3371 if (secy->replay_protect) {
3372 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3373 goto nla_put_failure;
3374 }
3375
3376 return 0;
3377
3378 nla_put_failure:
3379 return -EMSGSIZE;
3380 }
3381
3382 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3383 .kind = "macsec",
3384 .priv_size = sizeof(struct macsec_dev),
3385 .maxtype = IFLA_MACSEC_MAX,
3386 .policy = macsec_rtnl_policy,
3387 .setup = macsec_setup,
3388 .validate = macsec_validate_attr,
3389 .newlink = macsec_newlink,
3390 .changelink = macsec_changelink,
3391 .dellink = macsec_dellink,
3392 .get_size = macsec_get_size,
3393 .fill_info = macsec_fill_info,
3394 .get_link_net = macsec_get_link_net,
3395 };
3396
3397 static bool is_macsec_master(struct net_device *dev)
3398 {
3399 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3400 }
3401
3402 static int macsec_notify(struct notifier_block *this, unsigned long event,
3403 void *ptr)
3404 {
3405 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3406 LIST_HEAD(head);
3407
3408 if (!is_macsec_master(real_dev))
3409 return NOTIFY_DONE;
3410
3411 switch (event) {
3412 case NETDEV_UNREGISTER: {
3413 struct macsec_dev *m, *n;
3414 struct macsec_rxh_data *rxd;
3415
3416 rxd = macsec_data_rtnl(real_dev);
3417 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3418 macsec_common_dellink(m->secy.netdev, &head);
3419 }
3420
3421 netdev_rx_handler_unregister(real_dev);
3422 kfree(rxd);
3423
3424 unregister_netdevice_many(&head);
3425 break;
3426 }
3427 case NETDEV_CHANGEMTU: {
3428 struct macsec_dev *m;
3429 struct macsec_rxh_data *rxd;
3430
3431 rxd = macsec_data_rtnl(real_dev);
3432 list_for_each_entry(m, &rxd->secys, secys) {
3433 struct net_device *dev = m->secy.netdev;
3434 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3435 macsec_extra_len(true));
3436
3437 if (dev->mtu > mtu)
3438 dev_set_mtu(dev, mtu);
3439 }
3440 }
3441 }
3442
3443 return NOTIFY_OK;
3444 }
3445
3446 static struct notifier_block macsec_notifier = {
3447 .notifier_call = macsec_notify,
3448 };
3449
3450 static int __init macsec_init(void)
3451 {
3452 int err;
3453
3454 pr_info("MACsec IEEE 802.1AE\n");
3455 err = register_netdevice_notifier(&macsec_notifier);
3456 if (err)
3457 return err;
3458
3459 err = rtnl_link_register(&macsec_link_ops);
3460 if (err)
3461 goto notifier;
3462
3463 err = genl_register_family_with_ops(&macsec_fam, macsec_genl_ops);
3464 if (err)
3465 goto rtnl;
3466
3467 return 0;
3468
3469 rtnl:
3470 rtnl_link_unregister(&macsec_link_ops);
3471 notifier:
3472 unregister_netdevice_notifier(&macsec_notifier);
3473 return err;
3474 }
3475
3476 static void __exit macsec_exit(void)
3477 {
3478 genl_unregister_family(&macsec_fam);
3479 rtnl_link_unregister(&macsec_link_ops);
3480 unregister_netdevice_notifier(&macsec_notifier);
3481 rcu_barrier();
3482 }
3483
3484 module_init(macsec_init);
3485 module_exit(macsec_exit);
3486
3487 MODULE_ALIAS_RTNL_LINK("macsec");
3488
3489 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3490 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support