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macsec: don't put a NULL rxsa
[mirror_ubuntu-hirsute-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
22 #include <uapi/linux/if_macsec.h>
23
24 typedef u64 __bitwise sci_t;
25
26 #define MACSEC_SCI_LEN 8
27
28 /* SecTAG length = macsec_eth_header without the optional SCI */
29 #define MACSEC_TAG_LEN 6
30
31 struct macsec_eth_header {
32 struct ethhdr eth;
33 /* SecTAG */
34 u8 tci_an;
35 #if defined(__LITTLE_ENDIAN_BITFIELD)
36 u8 short_length:6,
37 unused:2;
38 #elif defined(__BIG_ENDIAN_BITFIELD)
39 u8 unused:2,
40 short_length:6;
41 #else
42 #error "Please fix <asm/byteorder.h>"
43 #endif
44 __be32 packet_number;
45 u8 secure_channel_id[8]; /* optional */
46 } __packed;
47
48 #define MACSEC_TCI_VERSION 0x80
49 #define MACSEC_TCI_ES 0x40 /* end station */
50 #define MACSEC_TCI_SC 0x20 /* SCI present */
51 #define MACSEC_TCI_SCB 0x10 /* epon */
52 #define MACSEC_TCI_E 0x08 /* encryption */
53 #define MACSEC_TCI_C 0x04 /* changed text */
54 #define MACSEC_AN_MASK 0x03 /* association number */
55 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
56
57 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
58 #define MIN_NON_SHORT_LEN 48
59
60 #define GCM_AES_IV_LEN 12
61 #define DEFAULT_ICV_LEN 16
62
63 #define MACSEC_NUM_AN 4 /* 2 bits for the association number */
64
65 #define for_each_rxsc(secy, sc) \
66 for (sc = rcu_dereference_bh(secy->rx_sc); \
67 sc; \
68 sc = rcu_dereference_bh(sc->next))
69 #define for_each_rxsc_rtnl(secy, sc) \
70 for (sc = rtnl_dereference(secy->rx_sc); \
71 sc; \
72 sc = rtnl_dereference(sc->next))
73
74 struct gcm_iv {
75 union {
76 u8 secure_channel_id[8];
77 sci_t sci;
78 };
79 __be32 pn;
80 };
81
82 /**
83 * struct macsec_key - SA key
84 * @id: user-provided key identifier
85 * @tfm: crypto struct, key storage
86 */
87 struct macsec_key {
88 u64 id;
89 struct crypto_aead *tfm;
90 };
91
92 struct macsec_rx_sc_stats {
93 __u64 InOctetsValidated;
94 __u64 InOctetsDecrypted;
95 __u64 InPktsUnchecked;
96 __u64 InPktsDelayed;
97 __u64 InPktsOK;
98 __u64 InPktsInvalid;
99 __u64 InPktsLate;
100 __u64 InPktsNotValid;
101 __u64 InPktsNotUsingSA;
102 __u64 InPktsUnusedSA;
103 };
104
105 struct macsec_rx_sa_stats {
106 __u32 InPktsOK;
107 __u32 InPktsInvalid;
108 __u32 InPktsNotValid;
109 __u32 InPktsNotUsingSA;
110 __u32 InPktsUnusedSA;
111 };
112
113 struct macsec_tx_sa_stats {
114 __u32 OutPktsProtected;
115 __u32 OutPktsEncrypted;
116 };
117
118 struct macsec_tx_sc_stats {
119 __u64 OutPktsProtected;
120 __u64 OutPktsEncrypted;
121 __u64 OutOctetsProtected;
122 __u64 OutOctetsEncrypted;
123 };
124
125 struct macsec_dev_stats {
126 __u64 OutPktsUntagged;
127 __u64 InPktsUntagged;
128 __u64 OutPktsTooLong;
129 __u64 InPktsNoTag;
130 __u64 InPktsBadTag;
131 __u64 InPktsUnknownSCI;
132 __u64 InPktsNoSCI;
133 __u64 InPktsOverrun;
134 };
135
136 /**
137 * struct macsec_rx_sa - receive secure association
138 * @active:
139 * @next_pn: packet number expected for the next packet
140 * @lock: protects next_pn manipulations
141 * @key: key structure
142 * @stats: per-SA stats
143 */
144 struct macsec_rx_sa {
145 struct macsec_key key;
146 spinlock_t lock;
147 u32 next_pn;
148 atomic_t refcnt;
149 bool active;
150 struct macsec_rx_sa_stats __percpu *stats;
151 struct macsec_rx_sc *sc;
152 struct rcu_head rcu;
153 };
154
155 struct pcpu_rx_sc_stats {
156 struct macsec_rx_sc_stats stats;
157 struct u64_stats_sync syncp;
158 };
159
160 /**
161 * struct macsec_rx_sc - receive secure channel
162 * @sci: secure channel identifier for this SC
163 * @active: channel is active
164 * @sa: array of secure associations
165 * @stats: per-SC stats
166 */
167 struct macsec_rx_sc {
168 struct macsec_rx_sc __rcu *next;
169 sci_t sci;
170 bool active;
171 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN];
172 struct pcpu_rx_sc_stats __percpu *stats;
173 atomic_t refcnt;
174 struct rcu_head rcu_head;
175 };
176
177 /**
178 * struct macsec_tx_sa - transmit secure association
179 * @active:
180 * @next_pn: packet number to use for the next packet
181 * @lock: protects next_pn manipulations
182 * @key: key structure
183 * @stats: per-SA stats
184 */
185 struct macsec_tx_sa {
186 struct macsec_key key;
187 spinlock_t lock;
188 u32 next_pn;
189 atomic_t refcnt;
190 bool active;
191 struct macsec_tx_sa_stats __percpu *stats;
192 struct rcu_head rcu;
193 };
194
195 struct pcpu_tx_sc_stats {
196 struct macsec_tx_sc_stats stats;
197 struct u64_stats_sync syncp;
198 };
199
200 /**
201 * struct macsec_tx_sc - transmit secure channel
202 * @active:
203 * @encoding_sa: association number of the SA currently in use
204 * @encrypt: encrypt packets on transmit, or authenticate only
205 * @send_sci: always include the SCI in the SecTAG
206 * @end_station:
207 * @scb: single copy broadcast flag
208 * @sa: array of secure associations
209 * @stats: stats for this TXSC
210 */
211 struct macsec_tx_sc {
212 bool active;
213 u8 encoding_sa;
214 bool encrypt;
215 bool send_sci;
216 bool end_station;
217 bool scb;
218 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN];
219 struct pcpu_tx_sc_stats __percpu *stats;
220 };
221
222 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
223
224 /**
225 * struct macsec_secy - MACsec Security Entity
226 * @netdev: netdevice for this SecY
227 * @n_rx_sc: number of receive secure channels configured on this SecY
228 * @sci: secure channel identifier used for tx
229 * @key_len: length of keys used by the cipher suite
230 * @icv_len: length of ICV used by the cipher suite
231 * @validate_frames: validation mode
232 * @operational: MAC_Operational flag
233 * @protect_frames: enable protection for this SecY
234 * @replay_protect: enable packet number checks on receive
235 * @replay_window: size of the replay window
236 * @tx_sc: transmit secure channel
237 * @rx_sc: linked list of receive secure channels
238 */
239 struct macsec_secy {
240 struct net_device *netdev;
241 unsigned int n_rx_sc;
242 sci_t sci;
243 u16 key_len;
244 u16 icv_len;
245 enum macsec_validation_type validate_frames;
246 bool operational;
247 bool protect_frames;
248 bool replay_protect;
249 u32 replay_window;
250 struct macsec_tx_sc tx_sc;
251 struct macsec_rx_sc __rcu *rx_sc;
252 };
253
254 struct pcpu_secy_stats {
255 struct macsec_dev_stats stats;
256 struct u64_stats_sync syncp;
257 };
258
259 /**
260 * struct macsec_dev - private data
261 * @secy: SecY config
262 * @real_dev: pointer to underlying netdevice
263 * @stats: MACsec device stats
264 * @secys: linked list of SecY's on the underlying device
265 */
266 struct macsec_dev {
267 struct macsec_secy secy;
268 struct net_device *real_dev;
269 struct pcpu_secy_stats __percpu *stats;
270 struct list_head secys;
271 };
272
273 /**
274 * struct macsec_rxh_data - rx_handler private argument
275 * @secys: linked list of SecY's on this underlying device
276 */
277 struct macsec_rxh_data {
278 struct list_head secys;
279 };
280
281 static struct macsec_dev *macsec_priv(const struct net_device *dev)
282 {
283 return (struct macsec_dev *)netdev_priv(dev);
284 }
285
286 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
287 {
288 return rcu_dereference_bh(dev->rx_handler_data);
289 }
290
291 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
292 {
293 return rtnl_dereference(dev->rx_handler_data);
294 }
295
296 struct macsec_cb {
297 struct aead_request *req;
298 union {
299 struct macsec_tx_sa *tx_sa;
300 struct macsec_rx_sa *rx_sa;
301 };
302 u8 assoc_num;
303 bool valid;
304 bool has_sci;
305 };
306
307 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
308 {
309 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
310
311 if (!sa || !sa->active)
312 return NULL;
313
314 if (!atomic_inc_not_zero(&sa->refcnt))
315 return NULL;
316
317 return sa;
318 }
319
320 static void free_rx_sc_rcu(struct rcu_head *head)
321 {
322 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
323
324 free_percpu(rx_sc->stats);
325 kfree(rx_sc);
326 }
327
328 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
329 {
330 return atomic_inc_not_zero(&sc->refcnt) ? sc : NULL;
331 }
332
333 static void macsec_rxsc_put(struct macsec_rx_sc *sc)
334 {
335 if (atomic_dec_and_test(&sc->refcnt))
336 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
337 }
338
339 static void free_rxsa(struct rcu_head *head)
340 {
341 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
342
343 crypto_free_aead(sa->key.tfm);
344 free_percpu(sa->stats);
345 macsec_rxsc_put(sa->sc);
346 kfree(sa);
347 }
348
349 static void macsec_rxsa_put(struct macsec_rx_sa *sa)
350 {
351 if (atomic_dec_and_test(&sa->refcnt))
352 call_rcu(&sa->rcu, free_rxsa);
353 }
354
355 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
356 {
357 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
358
359 if (!sa || !sa->active)
360 return NULL;
361
362 if (!atomic_inc_not_zero(&sa->refcnt))
363 return NULL;
364
365 return sa;
366 }
367
368 static void free_txsa(struct rcu_head *head)
369 {
370 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
371
372 crypto_free_aead(sa->key.tfm);
373 free_percpu(sa->stats);
374 kfree(sa);
375 }
376
377 static void macsec_txsa_put(struct macsec_tx_sa *sa)
378 {
379 if (atomic_dec_and_test(&sa->refcnt))
380 call_rcu(&sa->rcu, free_txsa);
381 }
382
383 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
384 {
385 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
386 return (struct macsec_cb *)skb->cb;
387 }
388
389 #define MACSEC_PORT_ES (htons(0x0001))
390 #define MACSEC_PORT_SCB (0x0000)
391 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
392
393 #define DEFAULT_SAK_LEN 16
394 #define DEFAULT_SEND_SCI true
395 #define DEFAULT_ENCRYPT false
396 #define DEFAULT_ENCODING_SA 0
397
398 static sci_t make_sci(u8 *addr, __be16 port)
399 {
400 sci_t sci;
401
402 memcpy(&sci, addr, ETH_ALEN);
403 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
404
405 return sci;
406 }
407
408 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
409 {
410 sci_t sci;
411
412 if (sci_present)
413 memcpy(&sci, hdr->secure_channel_id,
414 sizeof(hdr->secure_channel_id));
415 else
416 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
417
418 return sci;
419 }
420
421 static unsigned int macsec_sectag_len(bool sci_present)
422 {
423 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
424 }
425
426 static unsigned int macsec_hdr_len(bool sci_present)
427 {
428 return macsec_sectag_len(sci_present) + ETH_HLEN;
429 }
430
431 static unsigned int macsec_extra_len(bool sci_present)
432 {
433 return macsec_sectag_len(sci_present) + sizeof(__be16);
434 }
435
436 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
437 static void macsec_fill_sectag(struct macsec_eth_header *h,
438 const struct macsec_secy *secy, u32 pn)
439 {
440 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
441
442 memset(&h->tci_an, 0, macsec_sectag_len(tx_sc->send_sci));
443 h->eth.h_proto = htons(ETH_P_MACSEC);
444
445 if (tx_sc->send_sci ||
446 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb)) {
447 h->tci_an |= MACSEC_TCI_SC;
448 memcpy(&h->secure_channel_id, &secy->sci,
449 sizeof(h->secure_channel_id));
450 } else {
451 if (tx_sc->end_station)
452 h->tci_an |= MACSEC_TCI_ES;
453 if (tx_sc->scb)
454 h->tci_an |= MACSEC_TCI_SCB;
455 }
456
457 h->packet_number = htonl(pn);
458
459 /* with GCM, C/E clear for !encrypt, both set for encrypt */
460 if (tx_sc->encrypt)
461 h->tci_an |= MACSEC_TCI_CONFID;
462 else if (secy->icv_len != DEFAULT_ICV_LEN)
463 h->tci_an |= MACSEC_TCI_C;
464
465 h->tci_an |= tx_sc->encoding_sa;
466 }
467
468 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
469 {
470 if (data_len < MIN_NON_SHORT_LEN)
471 h->short_length = data_len;
472 }
473
474 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
475 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
476 {
477 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
478 int len = skb->len - 2 * ETH_ALEN;
479 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
480
481 /* a) It comprises at least 17 octets */
482 if (skb->len <= 16)
483 return false;
484
485 /* b) MACsec EtherType: already checked */
486
487 /* c) V bit is clear */
488 if (h->tci_an & MACSEC_TCI_VERSION)
489 return false;
490
491 /* d) ES or SCB => !SC */
492 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
493 (h->tci_an & MACSEC_TCI_SC))
494 return false;
495
496 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
497 if (h->unused)
498 return false;
499
500 /* rx.pn != 0 (figure 10-5) */
501 if (!h->packet_number)
502 return false;
503
504 /* length check, f) g) h) i) */
505 if (h->short_length)
506 return len == extra_len + h->short_length;
507 return len >= extra_len + MIN_NON_SHORT_LEN;
508 }
509
510 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
511 #define MACSEC_NEEDED_TAILROOM MACSEC_MAX_ICV_LEN
512
513 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
514 {
515 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
516
517 gcm_iv->sci = sci;
518 gcm_iv->pn = htonl(pn);
519 }
520
521 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
522 {
523 return (struct macsec_eth_header *)skb_mac_header(skb);
524 }
525
526 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
527 {
528 u32 pn;
529
530 spin_lock_bh(&tx_sa->lock);
531 pn = tx_sa->next_pn;
532
533 tx_sa->next_pn++;
534 if (tx_sa->next_pn == 0) {
535 pr_debug("PN wrapped, transitioning to !oper\n");
536 tx_sa->active = false;
537 if (secy->protect_frames)
538 secy->operational = false;
539 }
540 spin_unlock_bh(&tx_sa->lock);
541
542 return pn;
543 }
544
545 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
546 {
547 struct macsec_dev *macsec = netdev_priv(dev);
548
549 skb->dev = macsec->real_dev;
550 skb_reset_mac_header(skb);
551 skb->protocol = eth_hdr(skb)->h_proto;
552 }
553
554 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
555 struct macsec_tx_sa *tx_sa)
556 {
557 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
558
559 u64_stats_update_begin(&txsc_stats->syncp);
560 if (tx_sc->encrypt) {
561 txsc_stats->stats.OutOctetsEncrypted += skb->len;
562 txsc_stats->stats.OutPktsEncrypted++;
563 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
564 } else {
565 txsc_stats->stats.OutOctetsProtected += skb->len;
566 txsc_stats->stats.OutPktsProtected++;
567 this_cpu_inc(tx_sa->stats->OutPktsProtected);
568 }
569 u64_stats_update_end(&txsc_stats->syncp);
570 }
571
572 static void count_tx(struct net_device *dev, int ret, int len)
573 {
574 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
575 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
576
577 u64_stats_update_begin(&stats->syncp);
578 stats->tx_packets++;
579 stats->tx_bytes += len;
580 u64_stats_update_end(&stats->syncp);
581 } else {
582 dev->stats.tx_dropped++;
583 }
584 }
585
586 static void macsec_encrypt_done(struct crypto_async_request *base, int err)
587 {
588 struct sk_buff *skb = base->data;
589 struct net_device *dev = skb->dev;
590 struct macsec_dev *macsec = macsec_priv(dev);
591 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
592 int len, ret;
593
594 aead_request_free(macsec_skb_cb(skb)->req);
595
596 rcu_read_lock_bh();
597 macsec_encrypt_finish(skb, dev);
598 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
599 len = skb->len;
600 ret = dev_queue_xmit(skb);
601 count_tx(dev, ret, len);
602 rcu_read_unlock_bh();
603
604 macsec_txsa_put(sa);
605 dev_put(dev);
606 }
607
608 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
609 struct net_device *dev)
610 {
611 int ret;
612 struct scatterlist sg[MAX_SKB_FRAGS + 1];
613 unsigned char iv[GCM_AES_IV_LEN];
614 struct ethhdr *eth;
615 struct macsec_eth_header *hh;
616 size_t unprotected_len;
617 struct aead_request *req;
618 struct macsec_secy *secy;
619 struct macsec_tx_sc *tx_sc;
620 struct macsec_tx_sa *tx_sa;
621 struct macsec_dev *macsec = macsec_priv(dev);
622 u32 pn;
623
624 secy = &macsec->secy;
625 tx_sc = &secy->tx_sc;
626
627 /* 10.5.1 TX SA assignment */
628 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
629 if (!tx_sa) {
630 secy->operational = false;
631 kfree_skb(skb);
632 return ERR_PTR(-EINVAL);
633 }
634
635 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
636 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
637 struct sk_buff *nskb = skb_copy_expand(skb,
638 MACSEC_NEEDED_HEADROOM,
639 MACSEC_NEEDED_TAILROOM,
640 GFP_ATOMIC);
641 if (likely(nskb)) {
642 consume_skb(skb);
643 skb = nskb;
644 } else {
645 macsec_txsa_put(tx_sa);
646 kfree_skb(skb);
647 return ERR_PTR(-ENOMEM);
648 }
649 } else {
650 skb = skb_unshare(skb, GFP_ATOMIC);
651 if (!skb) {
652 macsec_txsa_put(tx_sa);
653 return ERR_PTR(-ENOMEM);
654 }
655 }
656
657 unprotected_len = skb->len;
658 eth = eth_hdr(skb);
659 hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(tx_sc->send_sci));
660 memmove(hh, eth, 2 * ETH_ALEN);
661
662 pn = tx_sa_update_pn(tx_sa, secy);
663 if (pn == 0) {
664 macsec_txsa_put(tx_sa);
665 kfree_skb(skb);
666 return ERR_PTR(-ENOLINK);
667 }
668 macsec_fill_sectag(hh, secy, pn);
669 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
670
671 macsec_fill_iv(iv, secy->sci, pn);
672
673 skb_put(skb, secy->icv_len);
674
675 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
676 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
677
678 u64_stats_update_begin(&secy_stats->syncp);
679 secy_stats->stats.OutPktsTooLong++;
680 u64_stats_update_end(&secy_stats->syncp);
681
682 macsec_txsa_put(tx_sa);
683 kfree_skb(skb);
684 return ERR_PTR(-EINVAL);
685 }
686
687 req = aead_request_alloc(tx_sa->key.tfm, GFP_ATOMIC);
688 if (!req) {
689 macsec_txsa_put(tx_sa);
690 kfree_skb(skb);
691 return ERR_PTR(-ENOMEM);
692 }
693
694 sg_init_table(sg, MAX_SKB_FRAGS + 1);
695 skb_to_sgvec(skb, sg, 0, skb->len);
696
697 if (tx_sc->encrypt) {
698 int len = skb->len - macsec_hdr_len(tx_sc->send_sci) -
699 secy->icv_len;
700 aead_request_set_crypt(req, sg, sg, len, iv);
701 aead_request_set_ad(req, macsec_hdr_len(tx_sc->send_sci));
702 } else {
703 aead_request_set_crypt(req, sg, sg, 0, iv);
704 aead_request_set_ad(req, skb->len - secy->icv_len);
705 }
706
707 macsec_skb_cb(skb)->req = req;
708 macsec_skb_cb(skb)->tx_sa = tx_sa;
709 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
710
711 dev_hold(skb->dev);
712 ret = crypto_aead_encrypt(req);
713 if (ret == -EINPROGRESS) {
714 return ERR_PTR(ret);
715 } else if (ret != 0) {
716 dev_put(skb->dev);
717 kfree_skb(skb);
718 aead_request_free(req);
719 macsec_txsa_put(tx_sa);
720 return ERR_PTR(-EINVAL);
721 }
722
723 dev_put(skb->dev);
724 aead_request_free(req);
725 macsec_txsa_put(tx_sa);
726
727 return skb;
728 }
729
730 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
731 {
732 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
733 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
734 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
735 u32 lowest_pn = 0;
736
737 spin_lock(&rx_sa->lock);
738 if (rx_sa->next_pn >= secy->replay_window)
739 lowest_pn = rx_sa->next_pn - secy->replay_window;
740
741 /* Now perform replay protection check again
742 * (see IEEE 802.1AE-2006 figure 10-5)
743 */
744 if (secy->replay_protect && pn < lowest_pn) {
745 spin_unlock(&rx_sa->lock);
746 u64_stats_update_begin(&rxsc_stats->syncp);
747 rxsc_stats->stats.InPktsLate++;
748 u64_stats_update_end(&rxsc_stats->syncp);
749 return false;
750 }
751
752 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
753 u64_stats_update_begin(&rxsc_stats->syncp);
754 if (hdr->tci_an & MACSEC_TCI_E)
755 rxsc_stats->stats.InOctetsDecrypted += skb->len;
756 else
757 rxsc_stats->stats.InOctetsValidated += skb->len;
758 u64_stats_update_end(&rxsc_stats->syncp);
759 }
760
761 if (!macsec_skb_cb(skb)->valid) {
762 spin_unlock(&rx_sa->lock);
763
764 /* 10.6.5 */
765 if (hdr->tci_an & MACSEC_TCI_C ||
766 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
767 u64_stats_update_begin(&rxsc_stats->syncp);
768 rxsc_stats->stats.InPktsNotValid++;
769 u64_stats_update_end(&rxsc_stats->syncp);
770 return false;
771 }
772
773 u64_stats_update_begin(&rxsc_stats->syncp);
774 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
775 rxsc_stats->stats.InPktsInvalid++;
776 this_cpu_inc(rx_sa->stats->InPktsInvalid);
777 } else if (pn < lowest_pn) {
778 rxsc_stats->stats.InPktsDelayed++;
779 } else {
780 rxsc_stats->stats.InPktsUnchecked++;
781 }
782 u64_stats_update_end(&rxsc_stats->syncp);
783 } else {
784 u64_stats_update_begin(&rxsc_stats->syncp);
785 if (pn < lowest_pn) {
786 rxsc_stats->stats.InPktsDelayed++;
787 } else {
788 rxsc_stats->stats.InPktsOK++;
789 this_cpu_inc(rx_sa->stats->InPktsOK);
790 }
791 u64_stats_update_end(&rxsc_stats->syncp);
792
793 if (pn >= rx_sa->next_pn)
794 rx_sa->next_pn = pn + 1;
795 spin_unlock(&rx_sa->lock);
796 }
797
798 return true;
799 }
800
801 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
802 {
803 skb->pkt_type = PACKET_HOST;
804 skb->protocol = eth_type_trans(skb, dev);
805
806 skb_reset_network_header(skb);
807 if (!skb_transport_header_was_set(skb))
808 skb_reset_transport_header(skb);
809 skb_reset_mac_len(skb);
810 }
811
812 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
813 {
814 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
815 skb_pull(skb, hdr_len);
816 pskb_trim_unique(skb, skb->len - icv_len);
817 }
818
819 static void count_rx(struct net_device *dev, int len)
820 {
821 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
822
823 u64_stats_update_begin(&stats->syncp);
824 stats->rx_packets++;
825 stats->rx_bytes += len;
826 u64_stats_update_end(&stats->syncp);
827 }
828
829 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
830 {
831 struct sk_buff *skb = base->data;
832 struct net_device *dev = skb->dev;
833 struct macsec_dev *macsec = macsec_priv(dev);
834 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
835 int len, ret;
836 u32 pn;
837
838 aead_request_free(macsec_skb_cb(skb)->req);
839
840 rcu_read_lock_bh();
841 pn = ntohl(macsec_ethhdr(skb)->packet_number);
842 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
843 rcu_read_unlock_bh();
844 kfree_skb(skb);
845 goto out;
846 }
847
848 macsec_finalize_skb(skb, macsec->secy.icv_len,
849 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
850 macsec_reset_skb(skb, macsec->secy.netdev);
851
852 len = skb->len;
853 ret = netif_rx(skb);
854 if (ret == NET_RX_SUCCESS)
855 count_rx(dev, len);
856 else
857 macsec->secy.netdev->stats.rx_dropped++;
858
859 rcu_read_unlock_bh();
860
861 out:
862 macsec_rxsa_put(rx_sa);
863 dev_put(dev);
864 return;
865 }
866
867 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
868 struct net_device *dev,
869 struct macsec_rx_sa *rx_sa,
870 sci_t sci,
871 struct macsec_secy *secy)
872 {
873 int ret;
874 struct scatterlist sg[MAX_SKB_FRAGS + 1];
875 unsigned char iv[GCM_AES_IV_LEN];
876 struct aead_request *req;
877 struct macsec_eth_header *hdr;
878 u16 icv_len = secy->icv_len;
879
880 macsec_skb_cb(skb)->valid = false;
881 skb = skb_share_check(skb, GFP_ATOMIC);
882 if (!skb)
883 return NULL;
884
885 req = aead_request_alloc(rx_sa->key.tfm, GFP_ATOMIC);
886 if (!req) {
887 kfree_skb(skb);
888 return NULL;
889 }
890
891 hdr = (struct macsec_eth_header *)skb->data;
892 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
893
894 sg_init_table(sg, MAX_SKB_FRAGS + 1);
895 skb_to_sgvec(skb, sg, 0, skb->len);
896
897 if (hdr->tci_an & MACSEC_TCI_E) {
898 /* confidentiality: ethernet + macsec header
899 * authenticated, encrypted payload
900 */
901 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
902
903 aead_request_set_crypt(req, sg, sg, len, iv);
904 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
905 skb = skb_unshare(skb, GFP_ATOMIC);
906 if (!skb) {
907 aead_request_free(req);
908 return NULL;
909 }
910 } else {
911 /* integrity only: all headers + data authenticated */
912 aead_request_set_crypt(req, sg, sg, icv_len, iv);
913 aead_request_set_ad(req, skb->len - icv_len);
914 }
915
916 macsec_skb_cb(skb)->req = req;
917 macsec_skb_cb(skb)->rx_sa = rx_sa;
918 skb->dev = dev;
919 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
920
921 dev_hold(dev);
922 ret = crypto_aead_decrypt(req);
923 if (ret == -EINPROGRESS) {
924 return NULL;
925 } else if (ret != 0) {
926 /* decryption/authentication failed
927 * 10.6 if validateFrames is disabled, deliver anyway
928 */
929 if (ret != -EBADMSG) {
930 kfree_skb(skb);
931 skb = NULL;
932 }
933 } else {
934 macsec_skb_cb(skb)->valid = true;
935 }
936 dev_put(dev);
937
938 aead_request_free(req);
939
940 return skb;
941 }
942
943 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
944 {
945 struct macsec_rx_sc *rx_sc;
946
947 for_each_rxsc(secy, rx_sc) {
948 if (rx_sc->sci == sci)
949 return rx_sc;
950 }
951
952 return NULL;
953 }
954
955 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
956 {
957 struct macsec_rx_sc *rx_sc;
958
959 for_each_rxsc_rtnl(secy, rx_sc) {
960 if (rx_sc->sci == sci)
961 return rx_sc;
962 }
963
964 return NULL;
965 }
966
967 static void handle_not_macsec(struct sk_buff *skb)
968 {
969 struct macsec_rxh_data *rxd;
970 struct macsec_dev *macsec;
971
972 rcu_read_lock();
973 rxd = macsec_data_rcu(skb->dev);
974
975 /* 10.6 If the management control validateFrames is not
976 * Strict, frames without a SecTAG are received, counted, and
977 * delivered to the Controlled Port
978 */
979 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
980 struct sk_buff *nskb;
981 int ret;
982 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
983
984 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
985 u64_stats_update_begin(&secy_stats->syncp);
986 secy_stats->stats.InPktsNoTag++;
987 u64_stats_update_end(&secy_stats->syncp);
988 continue;
989 }
990
991 /* deliver on this port */
992 nskb = skb_clone(skb, GFP_ATOMIC);
993 if (!nskb)
994 break;
995
996 nskb->dev = macsec->secy.netdev;
997
998 ret = netif_rx(nskb);
999 if (ret == NET_RX_SUCCESS) {
1000 u64_stats_update_begin(&secy_stats->syncp);
1001 secy_stats->stats.InPktsUntagged++;
1002 u64_stats_update_end(&secy_stats->syncp);
1003 } else {
1004 macsec->secy.netdev->stats.rx_dropped++;
1005 }
1006 }
1007
1008 rcu_read_unlock();
1009 }
1010
1011 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1012 {
1013 struct sk_buff *skb = *pskb;
1014 struct net_device *dev = skb->dev;
1015 struct macsec_eth_header *hdr;
1016 struct macsec_secy *secy = NULL;
1017 struct macsec_rx_sc *rx_sc;
1018 struct macsec_rx_sa *rx_sa;
1019 struct macsec_rxh_data *rxd;
1020 struct macsec_dev *macsec;
1021 sci_t sci;
1022 u32 pn;
1023 bool cbit;
1024 struct pcpu_rx_sc_stats *rxsc_stats;
1025 struct pcpu_secy_stats *secy_stats;
1026 bool pulled_sci;
1027
1028 if (skb_headroom(skb) < ETH_HLEN)
1029 goto drop_direct;
1030
1031 hdr = macsec_ethhdr(skb);
1032 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1033 handle_not_macsec(skb);
1034
1035 /* and deliver to the uncontrolled port */
1036 return RX_HANDLER_PASS;
1037 }
1038
1039 skb = skb_unshare(skb, GFP_ATOMIC);
1040 if (!skb) {
1041 *pskb = NULL;
1042 return RX_HANDLER_CONSUMED;
1043 }
1044
1045 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1046 if (!pulled_sci) {
1047 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1048 goto drop_direct;
1049 }
1050
1051 hdr = macsec_ethhdr(skb);
1052
1053 /* Frames with a SecTAG that has the TCI E bit set but the C
1054 * bit clear are discarded, as this reserved encoding is used
1055 * to identify frames with a SecTAG that are not to be
1056 * delivered to the Controlled Port.
1057 */
1058 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1059 return RX_HANDLER_PASS;
1060
1061 /* now, pull the extra length */
1062 if (hdr->tci_an & MACSEC_TCI_SC) {
1063 if (!pulled_sci)
1064 goto drop_direct;
1065 }
1066
1067 /* ethernet header is part of crypto processing */
1068 skb_push(skb, ETH_HLEN);
1069
1070 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1071 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1072 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1073
1074 rcu_read_lock();
1075 rxd = macsec_data_rcu(skb->dev);
1076
1077 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1078 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1079
1080 if (sc) {
1081 secy = &macsec->secy;
1082 rx_sc = sc;
1083 break;
1084 }
1085 }
1086
1087 if (!secy)
1088 goto nosci;
1089
1090 dev = secy->netdev;
1091 macsec = macsec_priv(dev);
1092 secy_stats = this_cpu_ptr(macsec->stats);
1093 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1094
1095 if (!macsec_validate_skb(skb, secy->icv_len)) {
1096 u64_stats_update_begin(&secy_stats->syncp);
1097 secy_stats->stats.InPktsBadTag++;
1098 u64_stats_update_end(&secy_stats->syncp);
1099 goto drop_nosa;
1100 }
1101
1102 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1103 if (!rx_sa) {
1104 /* 10.6.1 if the SA is not in use */
1105
1106 /* If validateFrames is Strict or the C bit in the
1107 * SecTAG is set, discard
1108 */
1109 if (hdr->tci_an & MACSEC_TCI_C ||
1110 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1111 u64_stats_update_begin(&rxsc_stats->syncp);
1112 rxsc_stats->stats.InPktsNotUsingSA++;
1113 u64_stats_update_end(&rxsc_stats->syncp);
1114 goto drop_nosa;
1115 }
1116
1117 /* not Strict, the frame (with the SecTAG and ICV
1118 * removed) is delivered to the Controlled Port.
1119 */
1120 u64_stats_update_begin(&rxsc_stats->syncp);
1121 rxsc_stats->stats.InPktsUnusedSA++;
1122 u64_stats_update_end(&rxsc_stats->syncp);
1123 goto deliver;
1124 }
1125
1126 /* First, PN check to avoid decrypting obviously wrong packets */
1127 pn = ntohl(hdr->packet_number);
1128 if (secy->replay_protect) {
1129 bool late;
1130
1131 spin_lock(&rx_sa->lock);
1132 late = rx_sa->next_pn >= secy->replay_window &&
1133 pn < (rx_sa->next_pn - secy->replay_window);
1134 spin_unlock(&rx_sa->lock);
1135
1136 if (late) {
1137 u64_stats_update_begin(&rxsc_stats->syncp);
1138 rxsc_stats->stats.InPktsLate++;
1139 u64_stats_update_end(&rxsc_stats->syncp);
1140 goto drop;
1141 }
1142 }
1143
1144 /* Disabled && !changed text => skip validation */
1145 if (hdr->tci_an & MACSEC_TCI_C ||
1146 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1147 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1148
1149 if (!skb) {
1150 macsec_rxsa_put(rx_sa);
1151 rcu_read_unlock();
1152 *pskb = NULL;
1153 return RX_HANDLER_CONSUMED;
1154 }
1155
1156 if (!macsec_post_decrypt(skb, secy, pn))
1157 goto drop;
1158
1159 deliver:
1160 macsec_finalize_skb(skb, secy->icv_len,
1161 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1162 macsec_reset_skb(skb, secy->netdev);
1163
1164 if (rx_sa)
1165 macsec_rxsa_put(rx_sa);
1166 count_rx(dev, skb->len);
1167
1168 rcu_read_unlock();
1169
1170 *pskb = skb;
1171 return RX_HANDLER_ANOTHER;
1172
1173 drop:
1174 macsec_rxsa_put(rx_sa);
1175 drop_nosa:
1176 rcu_read_unlock();
1177 drop_direct:
1178 kfree_skb(skb);
1179 *pskb = NULL;
1180 return RX_HANDLER_CONSUMED;
1181
1182 nosci:
1183 /* 10.6.1 if the SC is not found */
1184 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1185 if (!cbit)
1186 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1187 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1188
1189 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1190 struct sk_buff *nskb;
1191 int ret;
1192
1193 secy_stats = this_cpu_ptr(macsec->stats);
1194
1195 /* If validateFrames is Strict or the C bit in the
1196 * SecTAG is set, discard
1197 */
1198 if (cbit ||
1199 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1200 u64_stats_update_begin(&secy_stats->syncp);
1201 secy_stats->stats.InPktsNoSCI++;
1202 u64_stats_update_end(&secy_stats->syncp);
1203 continue;
1204 }
1205
1206 /* not strict, the frame (with the SecTAG and ICV
1207 * removed) is delivered to the Controlled Port.
1208 */
1209 nskb = skb_clone(skb, GFP_ATOMIC);
1210 if (!nskb)
1211 break;
1212
1213 macsec_reset_skb(nskb, macsec->secy.netdev);
1214
1215 ret = netif_rx(nskb);
1216 if (ret == NET_RX_SUCCESS) {
1217 u64_stats_update_begin(&secy_stats->syncp);
1218 secy_stats->stats.InPktsUnknownSCI++;
1219 u64_stats_update_end(&secy_stats->syncp);
1220 } else {
1221 macsec->secy.netdev->stats.rx_dropped++;
1222 }
1223 }
1224
1225 rcu_read_unlock();
1226 *pskb = skb;
1227 return RX_HANDLER_PASS;
1228 }
1229
1230 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1231 {
1232 struct crypto_aead *tfm;
1233 int ret;
1234
1235 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
1236 if (!tfm || IS_ERR(tfm))
1237 return NULL;
1238
1239 ret = crypto_aead_setkey(tfm, key, key_len);
1240 if (ret < 0) {
1241 crypto_free_aead(tfm);
1242 return NULL;
1243 }
1244
1245 ret = crypto_aead_setauthsize(tfm, icv_len);
1246 if (ret < 0) {
1247 crypto_free_aead(tfm);
1248 return NULL;
1249 }
1250
1251 return tfm;
1252 }
1253
1254 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1255 int icv_len)
1256 {
1257 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1258 if (!rx_sa->stats)
1259 return -1;
1260
1261 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1262 if (!rx_sa->key.tfm) {
1263 free_percpu(rx_sa->stats);
1264 return -1;
1265 }
1266
1267 rx_sa->active = false;
1268 rx_sa->next_pn = 1;
1269 atomic_set(&rx_sa->refcnt, 1);
1270 spin_lock_init(&rx_sa->lock);
1271
1272 return 0;
1273 }
1274
1275 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1276 {
1277 rx_sa->active = false;
1278
1279 macsec_rxsa_put(rx_sa);
1280 }
1281
1282 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1283 {
1284 int i;
1285
1286 for (i = 0; i < MACSEC_NUM_AN; i++) {
1287 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1288
1289 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1290 if (sa)
1291 clear_rx_sa(sa);
1292 }
1293
1294 macsec_rxsc_put(rx_sc);
1295 }
1296
1297 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1298 {
1299 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1300
1301 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1302 rx_sc;
1303 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1304 if (rx_sc->sci == sci) {
1305 if (rx_sc->active)
1306 secy->n_rx_sc--;
1307 rcu_assign_pointer(*rx_scp, rx_sc->next);
1308 return rx_sc;
1309 }
1310 }
1311
1312 return NULL;
1313 }
1314
1315 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1316 {
1317 struct macsec_rx_sc *rx_sc;
1318 struct macsec_dev *macsec;
1319 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1320 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1321 struct macsec_secy *secy;
1322
1323 list_for_each_entry(macsec, &rxd->secys, secys) {
1324 if (find_rx_sc_rtnl(&macsec->secy, sci))
1325 return ERR_PTR(-EEXIST);
1326 }
1327
1328 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1329 if (!rx_sc)
1330 return ERR_PTR(-ENOMEM);
1331
1332 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1333 if (!rx_sc->stats) {
1334 kfree(rx_sc);
1335 return ERR_PTR(-ENOMEM);
1336 }
1337
1338 rx_sc->sci = sci;
1339 rx_sc->active = true;
1340 atomic_set(&rx_sc->refcnt, 1);
1341
1342 secy = &macsec_priv(dev)->secy;
1343 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1344 rcu_assign_pointer(secy->rx_sc, rx_sc);
1345
1346 if (rx_sc->active)
1347 secy->n_rx_sc++;
1348
1349 return rx_sc;
1350 }
1351
1352 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1353 int icv_len)
1354 {
1355 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1356 if (!tx_sa->stats)
1357 return -1;
1358
1359 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1360 if (!tx_sa->key.tfm) {
1361 free_percpu(tx_sa->stats);
1362 return -1;
1363 }
1364
1365 tx_sa->active = false;
1366 atomic_set(&tx_sa->refcnt, 1);
1367 spin_lock_init(&tx_sa->lock);
1368
1369 return 0;
1370 }
1371
1372 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1373 {
1374 tx_sa->active = false;
1375
1376 macsec_txsa_put(tx_sa);
1377 }
1378
1379 static struct genl_family macsec_fam = {
1380 .id = GENL_ID_GENERATE,
1381 .name = MACSEC_GENL_NAME,
1382 .hdrsize = 0,
1383 .version = MACSEC_GENL_VERSION,
1384 .maxattr = MACSEC_ATTR_MAX,
1385 .netnsok = true,
1386 };
1387
1388 static struct net_device *get_dev_from_nl(struct net *net,
1389 struct nlattr **attrs)
1390 {
1391 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1392 struct net_device *dev;
1393
1394 dev = __dev_get_by_index(net, ifindex);
1395 if (!dev)
1396 return ERR_PTR(-ENODEV);
1397
1398 if (!netif_is_macsec(dev))
1399 return ERR_PTR(-ENODEV);
1400
1401 return dev;
1402 }
1403
1404 static sci_t nla_get_sci(const struct nlattr *nla)
1405 {
1406 return (__force sci_t)nla_get_u64(nla);
1407 }
1408
1409 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value)
1410 {
1411 return nla_put_u64(skb, attrtype, (__force u64)value);
1412 }
1413
1414 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1415 struct nlattr **attrs,
1416 struct nlattr **tb_sa,
1417 struct net_device **devp,
1418 struct macsec_secy **secyp,
1419 struct macsec_tx_sc **scp,
1420 u8 *assoc_num)
1421 {
1422 struct net_device *dev;
1423 struct macsec_secy *secy;
1424 struct macsec_tx_sc *tx_sc;
1425 struct macsec_tx_sa *tx_sa;
1426
1427 if (!tb_sa[MACSEC_SA_ATTR_AN])
1428 return ERR_PTR(-EINVAL);
1429
1430 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1431
1432 dev = get_dev_from_nl(net, attrs);
1433 if (IS_ERR(dev))
1434 return ERR_CAST(dev);
1435
1436 if (*assoc_num >= MACSEC_NUM_AN)
1437 return ERR_PTR(-EINVAL);
1438
1439 secy = &macsec_priv(dev)->secy;
1440 tx_sc = &secy->tx_sc;
1441
1442 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1443 if (!tx_sa)
1444 return ERR_PTR(-ENODEV);
1445
1446 *devp = dev;
1447 *scp = tx_sc;
1448 *secyp = secy;
1449 return tx_sa;
1450 }
1451
1452 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1453 struct nlattr **attrs,
1454 struct nlattr **tb_rxsc,
1455 struct net_device **devp,
1456 struct macsec_secy **secyp)
1457 {
1458 struct net_device *dev;
1459 struct macsec_secy *secy;
1460 struct macsec_rx_sc *rx_sc;
1461 sci_t sci;
1462
1463 dev = get_dev_from_nl(net, attrs);
1464 if (IS_ERR(dev))
1465 return ERR_CAST(dev);
1466
1467 secy = &macsec_priv(dev)->secy;
1468
1469 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1470 return ERR_PTR(-EINVAL);
1471
1472 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1473 rx_sc = find_rx_sc_rtnl(secy, sci);
1474 if (!rx_sc)
1475 return ERR_PTR(-ENODEV);
1476
1477 *secyp = secy;
1478 *devp = dev;
1479
1480 return rx_sc;
1481 }
1482
1483 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1484 struct nlattr **attrs,
1485 struct nlattr **tb_rxsc,
1486 struct nlattr **tb_sa,
1487 struct net_device **devp,
1488 struct macsec_secy **secyp,
1489 struct macsec_rx_sc **scp,
1490 u8 *assoc_num)
1491 {
1492 struct macsec_rx_sc *rx_sc;
1493 struct macsec_rx_sa *rx_sa;
1494
1495 if (!tb_sa[MACSEC_SA_ATTR_AN])
1496 return ERR_PTR(-EINVAL);
1497
1498 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1499 if (*assoc_num >= MACSEC_NUM_AN)
1500 return ERR_PTR(-EINVAL);
1501
1502 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1503 if (IS_ERR(rx_sc))
1504 return ERR_CAST(rx_sc);
1505
1506 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1507 if (!rx_sa)
1508 return ERR_PTR(-ENODEV);
1509
1510 *scp = rx_sc;
1511 return rx_sa;
1512 }
1513
1514
1515 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1516 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1517 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1518 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1519 };
1520
1521 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1522 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1523 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1524 };
1525
1526 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1527 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1528 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1529 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1530 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_U64 },
1531 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1532 .len = MACSEC_MAX_KEY_LEN, },
1533 };
1534
1535 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1536 {
1537 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1538 return -EINVAL;
1539
1540 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG],
1541 macsec_genl_sa_policy))
1542 return -EINVAL;
1543
1544 return 0;
1545 }
1546
1547 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1548 {
1549 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1550 return -EINVAL;
1551
1552 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG],
1553 macsec_genl_rxsc_policy))
1554 return -EINVAL;
1555
1556 return 0;
1557 }
1558
1559 static bool validate_add_rxsa(struct nlattr **attrs)
1560 {
1561 if (!attrs[MACSEC_SA_ATTR_AN] ||
1562 !attrs[MACSEC_SA_ATTR_KEY] ||
1563 !attrs[MACSEC_SA_ATTR_KEYID])
1564 return false;
1565
1566 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1567 return false;
1568
1569 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1570 return false;
1571
1572 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1573 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1574 return false;
1575 }
1576
1577 return true;
1578 }
1579
1580 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1581 {
1582 struct net_device *dev;
1583 struct nlattr **attrs = info->attrs;
1584 struct macsec_secy *secy;
1585 struct macsec_rx_sc *rx_sc;
1586 struct macsec_rx_sa *rx_sa;
1587 unsigned char assoc_num;
1588 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1589 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1590
1591 if (!attrs[MACSEC_ATTR_IFINDEX])
1592 return -EINVAL;
1593
1594 if (parse_sa_config(attrs, tb_sa))
1595 return -EINVAL;
1596
1597 if (parse_rxsc_config(attrs, tb_rxsc))
1598 return -EINVAL;
1599
1600 if (!validate_add_rxsa(tb_sa))
1601 return -EINVAL;
1602
1603 rtnl_lock();
1604 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1605 if (IS_ERR(rx_sc) || !macsec_rxsc_get(rx_sc)) {
1606 rtnl_unlock();
1607 return PTR_ERR(rx_sc);
1608 }
1609
1610 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1611
1612 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1613 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1614 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1615 rtnl_unlock();
1616 return -EINVAL;
1617 }
1618
1619 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1620 if (rx_sa) {
1621 rtnl_unlock();
1622 return -EBUSY;
1623 }
1624
1625 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1626 if (!rx_sa || init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1627 secy->key_len, secy->icv_len)) {
1628 rtnl_unlock();
1629 return -ENOMEM;
1630 }
1631
1632 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1633 spin_lock_bh(&rx_sa->lock);
1634 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1635 spin_unlock_bh(&rx_sa->lock);
1636 }
1637
1638 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1639 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1640
1641 rx_sa->key.id = nla_get_u64(tb_sa[MACSEC_SA_ATTR_KEYID]);
1642 rx_sa->sc = rx_sc;
1643 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1644
1645 rtnl_unlock();
1646
1647 return 0;
1648 }
1649
1650 static bool validate_add_rxsc(struct nlattr **attrs)
1651 {
1652 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1653 return false;
1654
1655 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1656 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1657 return false;
1658 }
1659
1660 return true;
1661 }
1662
1663 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1664 {
1665 struct net_device *dev;
1666 sci_t sci = MACSEC_UNDEF_SCI;
1667 struct nlattr **attrs = info->attrs;
1668 struct macsec_rx_sc *rx_sc;
1669 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1670
1671 if (!attrs[MACSEC_ATTR_IFINDEX])
1672 return -EINVAL;
1673
1674 if (parse_rxsc_config(attrs, tb_rxsc))
1675 return -EINVAL;
1676
1677 if (!validate_add_rxsc(tb_rxsc))
1678 return -EINVAL;
1679
1680 rtnl_lock();
1681 dev = get_dev_from_nl(genl_info_net(info), attrs);
1682 if (IS_ERR(dev)) {
1683 rtnl_unlock();
1684 return PTR_ERR(dev);
1685 }
1686
1687 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1688
1689 rx_sc = create_rx_sc(dev, sci);
1690 if (IS_ERR(rx_sc)) {
1691 rtnl_unlock();
1692 return PTR_ERR(rx_sc);
1693 }
1694
1695 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1696 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1697
1698 rtnl_unlock();
1699
1700 return 0;
1701 }
1702
1703 static bool validate_add_txsa(struct nlattr **attrs)
1704 {
1705 if (!attrs[MACSEC_SA_ATTR_AN] ||
1706 !attrs[MACSEC_SA_ATTR_PN] ||
1707 !attrs[MACSEC_SA_ATTR_KEY] ||
1708 !attrs[MACSEC_SA_ATTR_KEYID])
1709 return false;
1710
1711 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1712 return false;
1713
1714 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1715 return false;
1716
1717 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1718 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1719 return false;
1720 }
1721
1722 return true;
1723 }
1724
1725 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1726 {
1727 struct net_device *dev;
1728 struct nlattr **attrs = info->attrs;
1729 struct macsec_secy *secy;
1730 struct macsec_tx_sc *tx_sc;
1731 struct macsec_tx_sa *tx_sa;
1732 unsigned char assoc_num;
1733 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1734
1735 if (!attrs[MACSEC_ATTR_IFINDEX])
1736 return -EINVAL;
1737
1738 if (parse_sa_config(attrs, tb_sa))
1739 return -EINVAL;
1740
1741 if (!validate_add_txsa(tb_sa))
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 secy = &macsec_priv(dev)->secy;
1752 tx_sc = &secy->tx_sc;
1753
1754 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1755
1756 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1757 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1758 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1759 rtnl_unlock();
1760 return -EINVAL;
1761 }
1762
1763 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1764 if (tx_sa) {
1765 rtnl_unlock();
1766 return -EBUSY;
1767 }
1768
1769 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1770 if (!tx_sa || init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1771 secy->key_len, secy->icv_len)) {
1772 rtnl_unlock();
1773 return -ENOMEM;
1774 }
1775
1776 tx_sa->key.id = nla_get_u64(tb_sa[MACSEC_SA_ATTR_KEYID]);
1777
1778 spin_lock_bh(&tx_sa->lock);
1779 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1780 spin_unlock_bh(&tx_sa->lock);
1781
1782 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1783 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1784
1785 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1786 secy->operational = true;
1787
1788 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1789
1790 rtnl_unlock();
1791
1792 return 0;
1793 }
1794
1795 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1796 {
1797 struct nlattr **attrs = info->attrs;
1798 struct net_device *dev;
1799 struct macsec_secy *secy;
1800 struct macsec_rx_sc *rx_sc;
1801 struct macsec_rx_sa *rx_sa;
1802 u8 assoc_num;
1803 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1804 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1805
1806 if (!attrs[MACSEC_ATTR_IFINDEX])
1807 return -EINVAL;
1808
1809 if (parse_sa_config(attrs, tb_sa))
1810 return -EINVAL;
1811
1812 if (parse_rxsc_config(attrs, tb_rxsc))
1813 return -EINVAL;
1814
1815 rtnl_lock();
1816 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1817 &dev, &secy, &rx_sc, &assoc_num);
1818 if (IS_ERR(rx_sa)) {
1819 rtnl_unlock();
1820 return PTR_ERR(rx_sa);
1821 }
1822
1823 if (rx_sa->active) {
1824 rtnl_unlock();
1825 return -EBUSY;
1826 }
1827
1828 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1829 clear_rx_sa(rx_sa);
1830
1831 rtnl_unlock();
1832
1833 return 0;
1834 }
1835
1836 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1837 {
1838 struct nlattr **attrs = info->attrs;
1839 struct net_device *dev;
1840 struct macsec_secy *secy;
1841 struct macsec_rx_sc *rx_sc;
1842 sci_t sci;
1843 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1844
1845 if (!attrs[MACSEC_ATTR_IFINDEX])
1846 return -EINVAL;
1847
1848 if (parse_rxsc_config(attrs, tb_rxsc))
1849 return -EINVAL;
1850
1851 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1852 return -EINVAL;
1853
1854 rtnl_lock();
1855 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1856 if (IS_ERR(dev)) {
1857 rtnl_unlock();
1858 return PTR_ERR(dev);
1859 }
1860
1861 secy = &macsec_priv(dev)->secy;
1862 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1863
1864 rx_sc = del_rx_sc(secy, sci);
1865 if (!rx_sc) {
1866 rtnl_unlock();
1867 return -ENODEV;
1868 }
1869
1870 free_rx_sc(rx_sc);
1871 rtnl_unlock();
1872
1873 return 0;
1874 }
1875
1876 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1877 {
1878 struct nlattr **attrs = info->attrs;
1879 struct net_device *dev;
1880 struct macsec_secy *secy;
1881 struct macsec_tx_sc *tx_sc;
1882 struct macsec_tx_sa *tx_sa;
1883 u8 assoc_num;
1884 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1885
1886 if (!attrs[MACSEC_ATTR_IFINDEX])
1887 return -EINVAL;
1888
1889 if (parse_sa_config(attrs, tb_sa))
1890 return -EINVAL;
1891
1892 rtnl_lock();
1893 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1894 &dev, &secy, &tx_sc, &assoc_num);
1895 if (IS_ERR(tx_sa)) {
1896 rtnl_unlock();
1897 return PTR_ERR(tx_sa);
1898 }
1899
1900 if (tx_sa->active) {
1901 rtnl_unlock();
1902 return -EBUSY;
1903 }
1904
1905 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
1906 clear_tx_sa(tx_sa);
1907
1908 rtnl_unlock();
1909
1910 return 0;
1911 }
1912
1913 static bool validate_upd_sa(struct nlattr **attrs)
1914 {
1915 if (!attrs[MACSEC_SA_ATTR_AN] ||
1916 attrs[MACSEC_SA_ATTR_KEY] ||
1917 attrs[MACSEC_SA_ATTR_KEYID])
1918 return false;
1919
1920 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1921 return false;
1922
1923 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1924 return false;
1925
1926 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1927 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1928 return false;
1929 }
1930
1931 return true;
1932 }
1933
1934 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
1935 {
1936 struct nlattr **attrs = info->attrs;
1937 struct net_device *dev;
1938 struct macsec_secy *secy;
1939 struct macsec_tx_sc *tx_sc;
1940 struct macsec_tx_sa *tx_sa;
1941 u8 assoc_num;
1942 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1943
1944 if (!attrs[MACSEC_ATTR_IFINDEX])
1945 return -EINVAL;
1946
1947 if (parse_sa_config(attrs, tb_sa))
1948 return -EINVAL;
1949
1950 if (!validate_upd_sa(tb_sa))
1951 return -EINVAL;
1952
1953 rtnl_lock();
1954 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1955 &dev, &secy, &tx_sc, &assoc_num);
1956 if (IS_ERR(tx_sa)) {
1957 rtnl_unlock();
1958 return PTR_ERR(tx_sa);
1959 }
1960
1961 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1962 spin_lock_bh(&tx_sa->lock);
1963 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1964 spin_unlock_bh(&tx_sa->lock);
1965 }
1966
1967 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1968 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1969
1970 if (assoc_num == tx_sc->encoding_sa)
1971 secy->operational = tx_sa->active;
1972
1973 rtnl_unlock();
1974
1975 return 0;
1976 }
1977
1978 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
1979 {
1980 struct nlattr **attrs = info->attrs;
1981 struct net_device *dev;
1982 struct macsec_secy *secy;
1983 struct macsec_rx_sc *rx_sc;
1984 struct macsec_rx_sa *rx_sa;
1985 u8 assoc_num;
1986 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1987 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1988
1989 if (!attrs[MACSEC_ATTR_IFINDEX])
1990 return -EINVAL;
1991
1992 if (parse_rxsc_config(attrs, tb_rxsc))
1993 return -EINVAL;
1994
1995 if (parse_sa_config(attrs, tb_sa))
1996 return -EINVAL;
1997
1998 if (!validate_upd_sa(tb_sa))
1999 return -EINVAL;
2000
2001 rtnl_lock();
2002 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2003 &dev, &secy, &rx_sc, &assoc_num);
2004 if (IS_ERR(rx_sa)) {
2005 rtnl_unlock();
2006 return PTR_ERR(rx_sa);
2007 }
2008
2009 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2010 spin_lock_bh(&rx_sa->lock);
2011 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2012 spin_unlock_bh(&rx_sa->lock);
2013 }
2014
2015 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2016 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2017
2018 rtnl_unlock();
2019 return 0;
2020 }
2021
2022 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2023 {
2024 struct nlattr **attrs = info->attrs;
2025 struct net_device *dev;
2026 struct macsec_secy *secy;
2027 struct macsec_rx_sc *rx_sc;
2028 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2029
2030 if (!attrs[MACSEC_ATTR_IFINDEX])
2031 return -EINVAL;
2032
2033 if (parse_rxsc_config(attrs, tb_rxsc))
2034 return -EINVAL;
2035
2036 if (!validate_add_rxsc(tb_rxsc))
2037 return -EINVAL;
2038
2039 rtnl_lock();
2040 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2041 if (IS_ERR(rx_sc)) {
2042 rtnl_unlock();
2043 return PTR_ERR(rx_sc);
2044 }
2045
2046 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2047 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2048
2049 if (rx_sc->active != new)
2050 secy->n_rx_sc += new ? 1 : -1;
2051
2052 rx_sc->active = new;
2053 }
2054
2055 rtnl_unlock();
2056
2057 return 0;
2058 }
2059
2060 static int copy_tx_sa_stats(struct sk_buff *skb,
2061 struct macsec_tx_sa_stats __percpu *pstats)
2062 {
2063 struct macsec_tx_sa_stats sum = {0, };
2064 int cpu;
2065
2066 for_each_possible_cpu(cpu) {
2067 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2068
2069 sum.OutPktsProtected += stats->OutPktsProtected;
2070 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2071 }
2072
2073 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2074 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2075 return -EMSGSIZE;
2076
2077 return 0;
2078 }
2079
2080 static int copy_rx_sa_stats(struct sk_buff *skb,
2081 struct macsec_rx_sa_stats __percpu *pstats)
2082 {
2083 struct macsec_rx_sa_stats sum = {0, };
2084 int cpu;
2085
2086 for_each_possible_cpu(cpu) {
2087 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2088
2089 sum.InPktsOK += stats->InPktsOK;
2090 sum.InPktsInvalid += stats->InPktsInvalid;
2091 sum.InPktsNotValid += stats->InPktsNotValid;
2092 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2093 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2094 }
2095
2096 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2097 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2098 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2099 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2100 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2101 return -EMSGSIZE;
2102
2103 return 0;
2104 }
2105
2106 static int copy_rx_sc_stats(struct sk_buff *skb,
2107 struct pcpu_rx_sc_stats __percpu *pstats)
2108 {
2109 struct macsec_rx_sc_stats sum = {0, };
2110 int cpu;
2111
2112 for_each_possible_cpu(cpu) {
2113 const struct pcpu_rx_sc_stats *stats;
2114 struct macsec_rx_sc_stats tmp;
2115 unsigned int start;
2116
2117 stats = per_cpu_ptr(pstats, cpu);
2118 do {
2119 start = u64_stats_fetch_begin_irq(&stats->syncp);
2120 memcpy(&tmp, &stats->stats, sizeof(tmp));
2121 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2122
2123 sum.InOctetsValidated += tmp.InOctetsValidated;
2124 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2125 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2126 sum.InPktsDelayed += tmp.InPktsDelayed;
2127 sum.InPktsOK += tmp.InPktsOK;
2128 sum.InPktsInvalid += tmp.InPktsInvalid;
2129 sum.InPktsLate += tmp.InPktsLate;
2130 sum.InPktsNotValid += tmp.InPktsNotValid;
2131 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2132 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2133 }
2134
2135 if (nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, sum.InOctetsValidated) ||
2136 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, sum.InOctetsDecrypted) ||
2137 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, sum.InPktsUnchecked) ||
2138 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, sum.InPktsDelayed) ||
2139 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2140 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2141 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, sum.InPktsLate) ||
2142 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2143 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2144 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2145 return -EMSGSIZE;
2146
2147 return 0;
2148 }
2149
2150 static int copy_tx_sc_stats(struct sk_buff *skb,
2151 struct pcpu_tx_sc_stats __percpu *pstats)
2152 {
2153 struct macsec_tx_sc_stats sum = {0, };
2154 int cpu;
2155
2156 for_each_possible_cpu(cpu) {
2157 const struct pcpu_tx_sc_stats *stats;
2158 struct macsec_tx_sc_stats tmp;
2159 unsigned int start;
2160
2161 stats = per_cpu_ptr(pstats, cpu);
2162 do {
2163 start = u64_stats_fetch_begin_irq(&stats->syncp);
2164 memcpy(&tmp, &stats->stats, sizeof(tmp));
2165 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2166
2167 sum.OutPktsProtected += tmp.OutPktsProtected;
2168 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2169 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2170 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2171 }
2172
2173 if (nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2174 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted) ||
2175 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, sum.OutOctetsProtected) ||
2176 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, sum.OutOctetsEncrypted))
2177 return -EMSGSIZE;
2178
2179 return 0;
2180 }
2181
2182 static int copy_secy_stats(struct sk_buff *skb,
2183 struct pcpu_secy_stats __percpu *pstats)
2184 {
2185 struct macsec_dev_stats sum = {0, };
2186 int cpu;
2187
2188 for_each_possible_cpu(cpu) {
2189 const struct pcpu_secy_stats *stats;
2190 struct macsec_dev_stats tmp;
2191 unsigned int start;
2192
2193 stats = per_cpu_ptr(pstats, cpu);
2194 do {
2195 start = u64_stats_fetch_begin_irq(&stats->syncp);
2196 memcpy(&tmp, &stats->stats, sizeof(tmp));
2197 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2198
2199 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2200 sum.InPktsUntagged += tmp.InPktsUntagged;
2201 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2202 sum.InPktsNoTag += tmp.InPktsNoTag;
2203 sum.InPktsBadTag += tmp.InPktsBadTag;
2204 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2205 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2206 sum.InPktsOverrun += tmp.InPktsOverrun;
2207 }
2208
2209 if (nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, sum.OutPktsUntagged) ||
2210 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, sum.InPktsUntagged) ||
2211 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, sum.OutPktsTooLong) ||
2212 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, sum.InPktsNoTag) ||
2213 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, sum.InPktsBadTag) ||
2214 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, sum.InPktsUnknownSCI) ||
2215 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, sum.InPktsNoSCI) ||
2216 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, sum.InPktsOverrun))
2217 return -EMSGSIZE;
2218
2219 return 0;
2220 }
2221
2222 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2223 {
2224 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2225 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2226
2227 if (!secy_nest)
2228 return 1;
2229
2230 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci) ||
2231 nla_put_u64(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, DEFAULT_CIPHER_ID) ||
2232 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2233 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2234 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2235 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2236 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2237 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2238 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2239 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2240 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2241 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2242 goto cancel;
2243
2244 if (secy->replay_protect) {
2245 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2246 goto cancel;
2247 }
2248
2249 nla_nest_end(skb, secy_nest);
2250 return 0;
2251
2252 cancel:
2253 nla_nest_cancel(skb, secy_nest);
2254 return 1;
2255 }
2256
2257 static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2258 struct sk_buff *skb, struct netlink_callback *cb)
2259 {
2260 struct macsec_rx_sc *rx_sc;
2261 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2262 struct nlattr *txsa_list, *rxsc_list;
2263 int i, j;
2264 void *hdr;
2265 struct nlattr *attr;
2266
2267 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2268 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2269 if (!hdr)
2270 return -EMSGSIZE;
2271
2272 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2273 goto nla_put_failure;
2274
2275 if (nla_put_secy(secy, skb))
2276 goto nla_put_failure;
2277
2278 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2279 if (!attr)
2280 goto nla_put_failure;
2281 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2282 nla_nest_cancel(skb, attr);
2283 goto nla_put_failure;
2284 }
2285 nla_nest_end(skb, attr);
2286
2287 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2288 if (!attr)
2289 goto nla_put_failure;
2290 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2291 nla_nest_cancel(skb, attr);
2292 goto nla_put_failure;
2293 }
2294 nla_nest_end(skb, attr);
2295
2296 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2297 if (!txsa_list)
2298 goto nla_put_failure;
2299 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2300 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2301 struct nlattr *txsa_nest;
2302
2303 if (!tx_sa)
2304 continue;
2305
2306 txsa_nest = nla_nest_start(skb, j++);
2307 if (!txsa_nest) {
2308 nla_nest_cancel(skb, txsa_list);
2309 goto nla_put_failure;
2310 }
2311
2312 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2313 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2314 nla_put_u64(skb, MACSEC_SA_ATTR_KEYID, tx_sa->key.id) ||
2315 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2316 nla_nest_cancel(skb, txsa_nest);
2317 nla_nest_cancel(skb, txsa_list);
2318 goto nla_put_failure;
2319 }
2320
2321 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2322 if (!attr) {
2323 nla_nest_cancel(skb, txsa_nest);
2324 nla_nest_cancel(skb, txsa_list);
2325 goto nla_put_failure;
2326 }
2327 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2328 nla_nest_cancel(skb, attr);
2329 nla_nest_cancel(skb, txsa_nest);
2330 nla_nest_cancel(skb, txsa_list);
2331 goto nla_put_failure;
2332 }
2333 nla_nest_end(skb, attr);
2334
2335 nla_nest_end(skb, txsa_nest);
2336 }
2337 nla_nest_end(skb, txsa_list);
2338
2339 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2340 if (!rxsc_list)
2341 goto nla_put_failure;
2342
2343 j = 1;
2344 for_each_rxsc_rtnl(secy, rx_sc) {
2345 int k;
2346 struct nlattr *rxsa_list;
2347 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2348
2349 if (!rxsc_nest) {
2350 nla_nest_cancel(skb, rxsc_list);
2351 goto nla_put_failure;
2352 }
2353
2354 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2355 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci)) {
2356 nla_nest_cancel(skb, rxsc_nest);
2357 nla_nest_cancel(skb, rxsc_list);
2358 goto nla_put_failure;
2359 }
2360
2361 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2362 if (!attr) {
2363 nla_nest_cancel(skb, rxsc_nest);
2364 nla_nest_cancel(skb, rxsc_list);
2365 goto nla_put_failure;
2366 }
2367 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2368 nla_nest_cancel(skb, attr);
2369 nla_nest_cancel(skb, rxsc_nest);
2370 nla_nest_cancel(skb, rxsc_list);
2371 goto nla_put_failure;
2372 }
2373 nla_nest_end(skb, attr);
2374
2375 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2376 if (!rxsa_list) {
2377 nla_nest_cancel(skb, rxsc_nest);
2378 nla_nest_cancel(skb, rxsc_list);
2379 goto nla_put_failure;
2380 }
2381
2382 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2383 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2384 struct nlattr *rxsa_nest;
2385
2386 if (!rx_sa)
2387 continue;
2388
2389 rxsa_nest = nla_nest_start(skb, k++);
2390 if (!rxsa_nest) {
2391 nla_nest_cancel(skb, rxsa_list);
2392 nla_nest_cancel(skb, rxsc_nest);
2393 nla_nest_cancel(skb, rxsc_list);
2394 goto nla_put_failure;
2395 }
2396
2397 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2398 if (!attr) {
2399 nla_nest_cancel(skb, rxsa_list);
2400 nla_nest_cancel(skb, rxsc_nest);
2401 nla_nest_cancel(skb, rxsc_list);
2402 goto nla_put_failure;
2403 }
2404 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2405 nla_nest_cancel(skb, attr);
2406 nla_nest_cancel(skb, rxsa_list);
2407 nla_nest_cancel(skb, rxsc_nest);
2408 nla_nest_cancel(skb, rxsc_list);
2409 goto nla_put_failure;
2410 }
2411 nla_nest_end(skb, attr);
2412
2413 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2414 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2415 nla_put_u64(skb, MACSEC_SA_ATTR_KEYID, rx_sa->key.id) ||
2416 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2417 nla_nest_cancel(skb, rxsa_nest);
2418 nla_nest_cancel(skb, rxsc_nest);
2419 nla_nest_cancel(skb, rxsc_list);
2420 goto nla_put_failure;
2421 }
2422 nla_nest_end(skb, rxsa_nest);
2423 }
2424
2425 nla_nest_end(skb, rxsa_list);
2426 nla_nest_end(skb, rxsc_nest);
2427 }
2428
2429 nla_nest_end(skb, rxsc_list);
2430
2431 genlmsg_end(skb, hdr);
2432
2433 return 0;
2434
2435 nla_put_failure:
2436 genlmsg_cancel(skb, hdr);
2437 return -EMSGSIZE;
2438 }
2439
2440 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2441 {
2442 struct net *net = sock_net(skb->sk);
2443 struct net_device *dev;
2444 int dev_idx, d;
2445
2446 dev_idx = cb->args[0];
2447
2448 d = 0;
2449 rtnl_lock();
2450 for_each_netdev(net, dev) {
2451 struct macsec_secy *secy;
2452
2453 if (d < dev_idx)
2454 goto next;
2455
2456 if (!netif_is_macsec(dev))
2457 goto next;
2458
2459 secy = &macsec_priv(dev)->secy;
2460 if (dump_secy(secy, dev, skb, cb) < 0)
2461 goto done;
2462 next:
2463 d++;
2464 }
2465
2466 done:
2467 rtnl_unlock();
2468 cb->args[0] = d;
2469 return skb->len;
2470 }
2471
2472 static const struct genl_ops macsec_genl_ops[] = {
2473 {
2474 .cmd = MACSEC_CMD_GET_TXSC,
2475 .dumpit = macsec_dump_txsc,
2476 .policy = macsec_genl_policy,
2477 },
2478 {
2479 .cmd = MACSEC_CMD_ADD_RXSC,
2480 .doit = macsec_add_rxsc,
2481 .policy = macsec_genl_policy,
2482 .flags = GENL_ADMIN_PERM,
2483 },
2484 {
2485 .cmd = MACSEC_CMD_DEL_RXSC,
2486 .doit = macsec_del_rxsc,
2487 .policy = macsec_genl_policy,
2488 .flags = GENL_ADMIN_PERM,
2489 },
2490 {
2491 .cmd = MACSEC_CMD_UPD_RXSC,
2492 .doit = macsec_upd_rxsc,
2493 .policy = macsec_genl_policy,
2494 .flags = GENL_ADMIN_PERM,
2495 },
2496 {
2497 .cmd = MACSEC_CMD_ADD_TXSA,
2498 .doit = macsec_add_txsa,
2499 .policy = macsec_genl_policy,
2500 .flags = GENL_ADMIN_PERM,
2501 },
2502 {
2503 .cmd = MACSEC_CMD_DEL_TXSA,
2504 .doit = macsec_del_txsa,
2505 .policy = macsec_genl_policy,
2506 .flags = GENL_ADMIN_PERM,
2507 },
2508 {
2509 .cmd = MACSEC_CMD_UPD_TXSA,
2510 .doit = macsec_upd_txsa,
2511 .policy = macsec_genl_policy,
2512 .flags = GENL_ADMIN_PERM,
2513 },
2514 {
2515 .cmd = MACSEC_CMD_ADD_RXSA,
2516 .doit = macsec_add_rxsa,
2517 .policy = macsec_genl_policy,
2518 .flags = GENL_ADMIN_PERM,
2519 },
2520 {
2521 .cmd = MACSEC_CMD_DEL_RXSA,
2522 .doit = macsec_del_rxsa,
2523 .policy = macsec_genl_policy,
2524 .flags = GENL_ADMIN_PERM,
2525 },
2526 {
2527 .cmd = MACSEC_CMD_UPD_RXSA,
2528 .doit = macsec_upd_rxsa,
2529 .policy = macsec_genl_policy,
2530 .flags = GENL_ADMIN_PERM,
2531 },
2532 };
2533
2534 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2535 struct net_device *dev)
2536 {
2537 struct macsec_dev *macsec = netdev_priv(dev);
2538 struct macsec_secy *secy = &macsec->secy;
2539 struct pcpu_secy_stats *secy_stats;
2540 int ret, len;
2541
2542 /* 10.5 */
2543 if (!secy->protect_frames) {
2544 secy_stats = this_cpu_ptr(macsec->stats);
2545 u64_stats_update_begin(&secy_stats->syncp);
2546 secy_stats->stats.OutPktsUntagged++;
2547 u64_stats_update_end(&secy_stats->syncp);
2548 len = skb->len;
2549 ret = dev_queue_xmit(skb);
2550 count_tx(dev, ret, len);
2551 return ret;
2552 }
2553
2554 if (!secy->operational) {
2555 kfree_skb(skb);
2556 dev->stats.tx_dropped++;
2557 return NETDEV_TX_OK;
2558 }
2559
2560 skb = macsec_encrypt(skb, dev);
2561 if (IS_ERR(skb)) {
2562 if (PTR_ERR(skb) != -EINPROGRESS)
2563 dev->stats.tx_dropped++;
2564 return NETDEV_TX_OK;
2565 }
2566
2567 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2568
2569 macsec_encrypt_finish(skb, dev);
2570 len = skb->len;
2571 ret = dev_queue_xmit(skb);
2572 count_tx(dev, ret, len);
2573 return ret;
2574 }
2575
2576 #define MACSEC_FEATURES \
2577 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2578 static int macsec_dev_init(struct net_device *dev)
2579 {
2580 struct macsec_dev *macsec = macsec_priv(dev);
2581 struct net_device *real_dev = macsec->real_dev;
2582
2583 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2584 if (!dev->tstats)
2585 return -ENOMEM;
2586
2587 dev->features = real_dev->features & MACSEC_FEATURES;
2588 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2589
2590 dev->needed_headroom = real_dev->needed_headroom +
2591 MACSEC_NEEDED_HEADROOM;
2592 dev->needed_tailroom = real_dev->needed_tailroom +
2593 MACSEC_NEEDED_TAILROOM;
2594
2595 if (is_zero_ether_addr(dev->dev_addr))
2596 eth_hw_addr_inherit(dev, real_dev);
2597 if (is_zero_ether_addr(dev->broadcast))
2598 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2599
2600 return 0;
2601 }
2602
2603 static void macsec_dev_uninit(struct net_device *dev)
2604 {
2605 free_percpu(dev->tstats);
2606 }
2607
2608 static netdev_features_t macsec_fix_features(struct net_device *dev,
2609 netdev_features_t features)
2610 {
2611 struct macsec_dev *macsec = macsec_priv(dev);
2612 struct net_device *real_dev = macsec->real_dev;
2613
2614 features &= real_dev->features & MACSEC_FEATURES;
2615 features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2616
2617 return features;
2618 }
2619
2620 static int macsec_dev_open(struct net_device *dev)
2621 {
2622 struct macsec_dev *macsec = macsec_priv(dev);
2623 struct net_device *real_dev = macsec->real_dev;
2624 int err;
2625
2626 if (!(real_dev->flags & IFF_UP))
2627 return -ENETDOWN;
2628
2629 err = dev_uc_add(real_dev, dev->dev_addr);
2630 if (err < 0)
2631 return err;
2632
2633 if (dev->flags & IFF_ALLMULTI) {
2634 err = dev_set_allmulti(real_dev, 1);
2635 if (err < 0)
2636 goto del_unicast;
2637 }
2638
2639 if (dev->flags & IFF_PROMISC) {
2640 err = dev_set_promiscuity(real_dev, 1);
2641 if (err < 0)
2642 goto clear_allmulti;
2643 }
2644
2645 if (netif_carrier_ok(real_dev))
2646 netif_carrier_on(dev);
2647
2648 return 0;
2649 clear_allmulti:
2650 if (dev->flags & IFF_ALLMULTI)
2651 dev_set_allmulti(real_dev, -1);
2652 del_unicast:
2653 dev_uc_del(real_dev, dev->dev_addr);
2654 netif_carrier_off(dev);
2655 return err;
2656 }
2657
2658 static int macsec_dev_stop(struct net_device *dev)
2659 {
2660 struct macsec_dev *macsec = macsec_priv(dev);
2661 struct net_device *real_dev = macsec->real_dev;
2662
2663 netif_carrier_off(dev);
2664
2665 dev_mc_unsync(real_dev, dev);
2666 dev_uc_unsync(real_dev, dev);
2667
2668 if (dev->flags & IFF_ALLMULTI)
2669 dev_set_allmulti(real_dev, -1);
2670
2671 if (dev->flags & IFF_PROMISC)
2672 dev_set_promiscuity(real_dev, -1);
2673
2674 dev_uc_del(real_dev, dev->dev_addr);
2675
2676 return 0;
2677 }
2678
2679 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2680 {
2681 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2682
2683 if (!(dev->flags & IFF_UP))
2684 return;
2685
2686 if (change & IFF_ALLMULTI)
2687 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2688
2689 if (change & IFF_PROMISC)
2690 dev_set_promiscuity(real_dev,
2691 dev->flags & IFF_PROMISC ? 1 : -1);
2692 }
2693
2694 static void macsec_dev_set_rx_mode(struct net_device *dev)
2695 {
2696 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2697
2698 dev_mc_sync(real_dev, dev);
2699 dev_uc_sync(real_dev, dev);
2700 }
2701
2702 static int macsec_set_mac_address(struct net_device *dev, void *p)
2703 {
2704 struct macsec_dev *macsec = macsec_priv(dev);
2705 struct net_device *real_dev = macsec->real_dev;
2706 struct sockaddr *addr = p;
2707 int err;
2708
2709 if (!is_valid_ether_addr(addr->sa_data))
2710 return -EADDRNOTAVAIL;
2711
2712 if (!(dev->flags & IFF_UP))
2713 goto out;
2714
2715 err = dev_uc_add(real_dev, addr->sa_data);
2716 if (err < 0)
2717 return err;
2718
2719 dev_uc_del(real_dev, dev->dev_addr);
2720
2721 out:
2722 ether_addr_copy(dev->dev_addr, addr->sa_data);
2723 return 0;
2724 }
2725
2726 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2727 {
2728 struct macsec_dev *macsec = macsec_priv(dev);
2729 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2730
2731 if (macsec->real_dev->mtu - extra < new_mtu)
2732 return -ERANGE;
2733
2734 dev->mtu = new_mtu;
2735
2736 return 0;
2737 }
2738
2739 static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev,
2740 struct rtnl_link_stats64 *s)
2741 {
2742 int cpu;
2743
2744 if (!dev->tstats)
2745 return s;
2746
2747 for_each_possible_cpu(cpu) {
2748 struct pcpu_sw_netstats *stats;
2749 struct pcpu_sw_netstats tmp;
2750 int start;
2751
2752 stats = per_cpu_ptr(dev->tstats, cpu);
2753 do {
2754 start = u64_stats_fetch_begin_irq(&stats->syncp);
2755 tmp.rx_packets = stats->rx_packets;
2756 tmp.rx_bytes = stats->rx_bytes;
2757 tmp.tx_packets = stats->tx_packets;
2758 tmp.tx_bytes = stats->tx_bytes;
2759 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2760
2761 s->rx_packets += tmp.rx_packets;
2762 s->rx_bytes += tmp.rx_bytes;
2763 s->tx_packets += tmp.tx_packets;
2764 s->tx_bytes += tmp.tx_bytes;
2765 }
2766
2767 s->rx_dropped = dev->stats.rx_dropped;
2768 s->tx_dropped = dev->stats.tx_dropped;
2769
2770 return s;
2771 }
2772
2773 static int macsec_get_iflink(const struct net_device *dev)
2774 {
2775 return macsec_priv(dev)->real_dev->ifindex;
2776 }
2777
2778 static const struct net_device_ops macsec_netdev_ops = {
2779 .ndo_init = macsec_dev_init,
2780 .ndo_uninit = macsec_dev_uninit,
2781 .ndo_open = macsec_dev_open,
2782 .ndo_stop = macsec_dev_stop,
2783 .ndo_fix_features = macsec_fix_features,
2784 .ndo_change_mtu = macsec_change_mtu,
2785 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2786 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2787 .ndo_set_mac_address = macsec_set_mac_address,
2788 .ndo_start_xmit = macsec_start_xmit,
2789 .ndo_get_stats64 = macsec_get_stats64,
2790 .ndo_get_iflink = macsec_get_iflink,
2791 };
2792
2793 static const struct device_type macsec_type = {
2794 .name = "macsec",
2795 };
2796
2797 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2798 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2799 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2800 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2801 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2802 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2803 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2804 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
2805 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
2806 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
2807 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
2808 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
2809 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
2810 };
2811
2812 static void macsec_free_netdev(struct net_device *dev)
2813 {
2814 struct macsec_dev *macsec = macsec_priv(dev);
2815 struct net_device *real_dev = macsec->real_dev;
2816
2817 free_percpu(macsec->stats);
2818 free_percpu(macsec->secy.tx_sc.stats);
2819
2820 dev_put(real_dev);
2821 free_netdev(dev);
2822 }
2823
2824 static void macsec_setup(struct net_device *dev)
2825 {
2826 ether_setup(dev);
2827 dev->tx_queue_len = 0;
2828 dev->netdev_ops = &macsec_netdev_ops;
2829 dev->destructor = macsec_free_netdev;
2830
2831 eth_zero_addr(dev->broadcast);
2832 }
2833
2834 static void macsec_changelink_common(struct net_device *dev,
2835 struct nlattr *data[])
2836 {
2837 struct macsec_secy *secy;
2838 struct macsec_tx_sc *tx_sc;
2839
2840 secy = &macsec_priv(dev)->secy;
2841 tx_sc = &secy->tx_sc;
2842
2843 if (data[IFLA_MACSEC_ENCODING_SA]) {
2844 struct macsec_tx_sa *tx_sa;
2845
2846 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
2847 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
2848
2849 secy->operational = tx_sa && tx_sa->active;
2850 }
2851
2852 if (data[IFLA_MACSEC_WINDOW])
2853 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
2854
2855 if (data[IFLA_MACSEC_ENCRYPT])
2856 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
2857
2858 if (data[IFLA_MACSEC_PROTECT])
2859 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
2860
2861 if (data[IFLA_MACSEC_INC_SCI])
2862 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
2863
2864 if (data[IFLA_MACSEC_ES])
2865 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
2866
2867 if (data[IFLA_MACSEC_SCB])
2868 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
2869
2870 if (data[IFLA_MACSEC_REPLAY_PROTECT])
2871 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
2872
2873 if (data[IFLA_MACSEC_VALIDATION])
2874 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
2875 }
2876
2877 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
2878 struct nlattr *data[])
2879 {
2880 if (!data)
2881 return 0;
2882
2883 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
2884 data[IFLA_MACSEC_ICV_LEN] ||
2885 data[IFLA_MACSEC_SCI] ||
2886 data[IFLA_MACSEC_PORT])
2887 return -EINVAL;
2888
2889 macsec_changelink_common(dev, data);
2890
2891 return 0;
2892 }
2893
2894 static void macsec_del_dev(struct macsec_dev *macsec)
2895 {
2896 int i;
2897
2898 while (macsec->secy.rx_sc) {
2899 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
2900
2901 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
2902 free_rx_sc(rx_sc);
2903 }
2904
2905 for (i = 0; i < MACSEC_NUM_AN; i++) {
2906 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
2907
2908 if (sa) {
2909 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
2910 clear_tx_sa(sa);
2911 }
2912 }
2913 }
2914
2915 static void macsec_dellink(struct net_device *dev, struct list_head *head)
2916 {
2917 struct macsec_dev *macsec = macsec_priv(dev);
2918 struct net_device *real_dev = macsec->real_dev;
2919 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
2920
2921 unregister_netdevice_queue(dev, head);
2922 list_del_rcu(&macsec->secys);
2923 if (list_empty(&rxd->secys))
2924 netdev_rx_handler_unregister(real_dev);
2925
2926 macsec_del_dev(macsec);
2927 }
2928
2929 static int register_macsec_dev(struct net_device *real_dev,
2930 struct net_device *dev)
2931 {
2932 struct macsec_dev *macsec = macsec_priv(dev);
2933 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
2934
2935 if (!rxd) {
2936 int err;
2937
2938 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
2939 if (!rxd)
2940 return -ENOMEM;
2941
2942 INIT_LIST_HEAD(&rxd->secys);
2943
2944 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
2945 rxd);
2946 if (err < 0)
2947 return err;
2948 }
2949
2950 list_add_tail_rcu(&macsec->secys, &rxd->secys);
2951 return 0;
2952 }
2953
2954 static bool sci_exists(struct net_device *dev, sci_t sci)
2955 {
2956 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
2957 struct macsec_dev *macsec;
2958
2959 list_for_each_entry(macsec, &rxd->secys, secys) {
2960 if (macsec->secy.sci == sci)
2961 return true;
2962 }
2963
2964 return false;
2965 }
2966
2967 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
2968 {
2969 return make_sci(dev->dev_addr, port);
2970 }
2971
2972 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
2973 {
2974 struct macsec_dev *macsec = macsec_priv(dev);
2975 struct macsec_secy *secy = &macsec->secy;
2976
2977 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
2978 if (!macsec->stats)
2979 return -ENOMEM;
2980
2981 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
2982 if (!secy->tx_sc.stats) {
2983 free_percpu(macsec->stats);
2984 return -ENOMEM;
2985 }
2986
2987 if (sci == MACSEC_UNDEF_SCI)
2988 sci = dev_to_sci(dev, MACSEC_PORT_ES);
2989
2990 secy->netdev = dev;
2991 secy->operational = true;
2992 secy->key_len = DEFAULT_SAK_LEN;
2993 secy->icv_len = icv_len;
2994 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
2995 secy->protect_frames = true;
2996 secy->replay_protect = false;
2997
2998 secy->sci = sci;
2999 secy->tx_sc.active = true;
3000 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3001 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3002 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3003 secy->tx_sc.end_station = false;
3004 secy->tx_sc.scb = false;
3005
3006 return 0;
3007 }
3008
3009 static int macsec_newlink(struct net *net, struct net_device *dev,
3010 struct nlattr *tb[], struct nlattr *data[])
3011 {
3012 struct macsec_dev *macsec = macsec_priv(dev);
3013 struct net_device *real_dev;
3014 int err;
3015 sci_t sci;
3016 u8 icv_len = DEFAULT_ICV_LEN;
3017 rx_handler_func_t *rx_handler;
3018
3019 if (!tb[IFLA_LINK])
3020 return -EINVAL;
3021 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3022 if (!real_dev)
3023 return -ENODEV;
3024
3025 dev->priv_flags |= IFF_MACSEC;
3026
3027 macsec->real_dev = real_dev;
3028
3029 if (data && data[IFLA_MACSEC_ICV_LEN])
3030 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3031 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3032
3033 rx_handler = rtnl_dereference(real_dev->rx_handler);
3034 if (rx_handler && rx_handler != macsec_handle_frame)
3035 return -EBUSY;
3036
3037 err = register_netdevice(dev);
3038 if (err < 0)
3039 return err;
3040
3041 /* need to be already registered so that ->init has run and
3042 * the MAC addr is set
3043 */
3044 if (data && data[IFLA_MACSEC_SCI])
3045 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3046 else if (data && data[IFLA_MACSEC_PORT])
3047 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3048 else
3049 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3050
3051 if (rx_handler && sci_exists(real_dev, sci)) {
3052 err = -EBUSY;
3053 goto unregister;
3054 }
3055
3056 err = macsec_add_dev(dev, sci, icv_len);
3057 if (err)
3058 goto unregister;
3059
3060 if (data)
3061 macsec_changelink_common(dev, data);
3062
3063 err = register_macsec_dev(real_dev, dev);
3064 if (err < 0)
3065 goto del_dev;
3066
3067 dev_hold(real_dev);
3068
3069 return 0;
3070
3071 del_dev:
3072 macsec_del_dev(macsec);
3073 unregister:
3074 unregister_netdevice(dev);
3075 return err;
3076 }
3077
3078 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
3079 {
3080 u64 csid = DEFAULT_CIPHER_ID;
3081 u8 icv_len = DEFAULT_ICV_LEN;
3082 int flag;
3083 bool es, scb, sci;
3084
3085 if (!data)
3086 return 0;
3087
3088 if (data[IFLA_MACSEC_CIPHER_SUITE])
3089 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3090
3091 if (data[IFLA_MACSEC_ICV_LEN])
3092 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3093
3094 switch (csid) {
3095 case DEFAULT_CIPHER_ID:
3096 case DEFAULT_CIPHER_ALT:
3097 if (icv_len < MACSEC_MIN_ICV_LEN ||
3098 icv_len > MACSEC_MAX_ICV_LEN)
3099 return -EINVAL;
3100 break;
3101 default:
3102 return -EINVAL;
3103 }
3104
3105 if (data[IFLA_MACSEC_ENCODING_SA]) {
3106 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3107 return -EINVAL;
3108 }
3109
3110 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3111 flag < IFLA_MACSEC_VALIDATION;
3112 flag++) {
3113 if (data[flag]) {
3114 if (nla_get_u8(data[flag]) > 1)
3115 return -EINVAL;
3116 }
3117 }
3118
3119 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3120 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3121 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3122
3123 if ((sci && (scb || es)) || (scb && es))
3124 return -EINVAL;
3125
3126 if (data[IFLA_MACSEC_VALIDATION] &&
3127 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3128 return -EINVAL;
3129
3130 if ((data[IFLA_MACSEC_PROTECT] &&
3131 nla_get_u8(data[IFLA_MACSEC_PROTECT])) &&
3132 !data[IFLA_MACSEC_WINDOW])
3133 return -EINVAL;
3134
3135 return 0;
3136 }
3137
3138 static struct net *macsec_get_link_net(const struct net_device *dev)
3139 {
3140 return dev_net(macsec_priv(dev)->real_dev);
3141 }
3142
3143 static size_t macsec_get_size(const struct net_device *dev)
3144 {
3145 return 0 +
3146 nla_total_size(8) + /* SCI */
3147 nla_total_size(1) + /* ICV_LEN */
3148 nla_total_size(8) + /* CIPHER_SUITE */
3149 nla_total_size(4) + /* WINDOW */
3150 nla_total_size(1) + /* ENCODING_SA */
3151 nla_total_size(1) + /* ENCRYPT */
3152 nla_total_size(1) + /* PROTECT */
3153 nla_total_size(1) + /* INC_SCI */
3154 nla_total_size(1) + /* ES */
3155 nla_total_size(1) + /* SCB */
3156 nla_total_size(1) + /* REPLAY_PROTECT */
3157 nla_total_size(1) + /* VALIDATION */
3158 0;
3159 }
3160
3161 static int macsec_fill_info(struct sk_buff *skb,
3162 const struct net_device *dev)
3163 {
3164 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3165 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3166
3167 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci) ||
3168 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3169 nla_put_u64(skb, IFLA_MACSEC_CIPHER_SUITE, DEFAULT_CIPHER_ID) ||
3170 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3171 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3172 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3173 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3174 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3175 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3176 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3177 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3178 0)
3179 goto nla_put_failure;
3180
3181 if (secy->replay_protect) {
3182 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3183 goto nla_put_failure;
3184 }
3185
3186 return 0;
3187
3188 nla_put_failure:
3189 return -EMSGSIZE;
3190 }
3191
3192 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3193 .kind = "macsec",
3194 .priv_size = sizeof(struct macsec_dev),
3195 .maxtype = IFLA_MACSEC_MAX,
3196 .policy = macsec_rtnl_policy,
3197 .setup = macsec_setup,
3198 .validate = macsec_validate_attr,
3199 .newlink = macsec_newlink,
3200 .changelink = macsec_changelink,
3201 .dellink = macsec_dellink,
3202 .get_size = macsec_get_size,
3203 .fill_info = macsec_fill_info,
3204 .get_link_net = macsec_get_link_net,
3205 };
3206
3207 static bool is_macsec_master(struct net_device *dev)
3208 {
3209 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3210 }
3211
3212 static int macsec_notify(struct notifier_block *this, unsigned long event,
3213 void *ptr)
3214 {
3215 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3216 LIST_HEAD(head);
3217
3218 if (!is_macsec_master(real_dev))
3219 return NOTIFY_DONE;
3220
3221 switch (event) {
3222 case NETDEV_UNREGISTER: {
3223 struct macsec_dev *m, *n;
3224 struct macsec_rxh_data *rxd;
3225
3226 rxd = macsec_data_rtnl(real_dev);
3227 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3228 macsec_dellink(m->secy.netdev, &head);
3229 }
3230 unregister_netdevice_many(&head);
3231 break;
3232 }
3233 case NETDEV_CHANGEMTU: {
3234 struct macsec_dev *m;
3235 struct macsec_rxh_data *rxd;
3236
3237 rxd = macsec_data_rtnl(real_dev);
3238 list_for_each_entry(m, &rxd->secys, secys) {
3239 struct net_device *dev = m->secy.netdev;
3240 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3241 macsec_extra_len(true));
3242
3243 if (dev->mtu > mtu)
3244 dev_set_mtu(dev, mtu);
3245 }
3246 }
3247 }
3248
3249 return NOTIFY_OK;
3250 }
3251
3252 static struct notifier_block macsec_notifier = {
3253 .notifier_call = macsec_notify,
3254 };
3255
3256 static int __init macsec_init(void)
3257 {
3258 int err;
3259
3260 pr_info("MACsec IEEE 802.1AE\n");
3261 err = register_netdevice_notifier(&macsec_notifier);
3262 if (err)
3263 return err;
3264
3265 err = rtnl_link_register(&macsec_link_ops);
3266 if (err)
3267 goto notifier;
3268
3269 err = genl_register_family_with_ops(&macsec_fam, macsec_genl_ops);
3270 if (err)
3271 goto rtnl;
3272
3273 return 0;
3274
3275 rtnl:
3276 rtnl_link_unregister(&macsec_link_ops);
3277 notifier:
3278 unregister_netdevice_notifier(&macsec_notifier);
3279 return err;
3280 }
3281
3282 static void __exit macsec_exit(void)
3283 {
3284 genl_unregister_family(&macsec_fam);
3285 rtnl_link_unregister(&macsec_link_ops);
3286 unregister_netdevice_notifier(&macsec_notifier);
3287 }
3288
3289 module_init(macsec_init);
3290 module_exit(macsec_exit);
3291
3292 MODULE_ALIAS_RTNL_LINK("macsec");
3293
3294 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3295 MODULE_LICENSE("GPL v2");
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