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