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Merge tag 'm68k-for-v4.8-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert...
[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
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 u8 id[MACSEC_KEYID_LEN];
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 aead_request *macsec_alloc_req(struct crypto_aead *tfm,
609 unsigned char **iv,
610 struct scatterlist **sg)
611 {
612 size_t size, iv_offset, sg_offset;
613 struct aead_request *req;
614 void *tmp;
615
616 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
617 iv_offset = size;
618 size += GCM_AES_IV_LEN;
619
620 size = ALIGN(size, __alignof__(struct scatterlist));
621 sg_offset = size;
622 size += sizeof(struct scatterlist) * (MAX_SKB_FRAGS + 1);
623
624 tmp = kmalloc(size, GFP_ATOMIC);
625 if (!tmp)
626 return NULL;
627
628 *iv = (unsigned char *)(tmp + iv_offset);
629 *sg = (struct scatterlist *)(tmp + sg_offset);
630 req = tmp;
631
632 aead_request_set_tfm(req, tfm);
633
634 return req;
635 }
636
637 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
638 struct net_device *dev)
639 {
640 int ret;
641 struct scatterlist *sg;
642 unsigned char *iv;
643 struct ethhdr *eth;
644 struct macsec_eth_header *hh;
645 size_t unprotected_len;
646 struct aead_request *req;
647 struct macsec_secy *secy;
648 struct macsec_tx_sc *tx_sc;
649 struct macsec_tx_sa *tx_sa;
650 struct macsec_dev *macsec = macsec_priv(dev);
651 u32 pn;
652
653 secy = &macsec->secy;
654 tx_sc = &secy->tx_sc;
655
656 /* 10.5.1 TX SA assignment */
657 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
658 if (!tx_sa) {
659 secy->operational = false;
660 kfree_skb(skb);
661 return ERR_PTR(-EINVAL);
662 }
663
664 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
665 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
666 struct sk_buff *nskb = skb_copy_expand(skb,
667 MACSEC_NEEDED_HEADROOM,
668 MACSEC_NEEDED_TAILROOM,
669 GFP_ATOMIC);
670 if (likely(nskb)) {
671 consume_skb(skb);
672 skb = nskb;
673 } else {
674 macsec_txsa_put(tx_sa);
675 kfree_skb(skb);
676 return ERR_PTR(-ENOMEM);
677 }
678 } else {
679 skb = skb_unshare(skb, GFP_ATOMIC);
680 if (!skb) {
681 macsec_txsa_put(tx_sa);
682 return ERR_PTR(-ENOMEM);
683 }
684 }
685
686 unprotected_len = skb->len;
687 eth = eth_hdr(skb);
688 hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(tx_sc->send_sci));
689 memmove(hh, eth, 2 * ETH_ALEN);
690
691 pn = tx_sa_update_pn(tx_sa, secy);
692 if (pn == 0) {
693 macsec_txsa_put(tx_sa);
694 kfree_skb(skb);
695 return ERR_PTR(-ENOLINK);
696 }
697 macsec_fill_sectag(hh, secy, pn);
698 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
699
700 skb_put(skb, secy->icv_len);
701
702 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
703 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
704
705 u64_stats_update_begin(&secy_stats->syncp);
706 secy_stats->stats.OutPktsTooLong++;
707 u64_stats_update_end(&secy_stats->syncp);
708
709 macsec_txsa_put(tx_sa);
710 kfree_skb(skb);
711 return ERR_PTR(-EINVAL);
712 }
713
714 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg);
715 if (!req) {
716 macsec_txsa_put(tx_sa);
717 kfree_skb(skb);
718 return ERR_PTR(-ENOMEM);
719 }
720
721 macsec_fill_iv(iv, secy->sci, pn);
722
723 sg_init_table(sg, MAX_SKB_FRAGS + 1);
724 skb_to_sgvec(skb, sg, 0, skb->len);
725
726 if (tx_sc->encrypt) {
727 int len = skb->len - macsec_hdr_len(tx_sc->send_sci) -
728 secy->icv_len;
729 aead_request_set_crypt(req, sg, sg, len, iv);
730 aead_request_set_ad(req, macsec_hdr_len(tx_sc->send_sci));
731 } else {
732 aead_request_set_crypt(req, sg, sg, 0, iv);
733 aead_request_set_ad(req, skb->len - secy->icv_len);
734 }
735
736 macsec_skb_cb(skb)->req = req;
737 macsec_skb_cb(skb)->tx_sa = tx_sa;
738 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
739
740 dev_hold(skb->dev);
741 ret = crypto_aead_encrypt(req);
742 if (ret == -EINPROGRESS) {
743 return ERR_PTR(ret);
744 } else if (ret != 0) {
745 dev_put(skb->dev);
746 kfree_skb(skb);
747 aead_request_free(req);
748 macsec_txsa_put(tx_sa);
749 return ERR_PTR(-EINVAL);
750 }
751
752 dev_put(skb->dev);
753 aead_request_free(req);
754 macsec_txsa_put(tx_sa);
755
756 return skb;
757 }
758
759 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
760 {
761 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
762 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
763 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
764 u32 lowest_pn = 0;
765
766 spin_lock(&rx_sa->lock);
767 if (rx_sa->next_pn >= secy->replay_window)
768 lowest_pn = rx_sa->next_pn - secy->replay_window;
769
770 /* Now perform replay protection check again
771 * (see IEEE 802.1AE-2006 figure 10-5)
772 */
773 if (secy->replay_protect && pn < lowest_pn) {
774 spin_unlock(&rx_sa->lock);
775 u64_stats_update_begin(&rxsc_stats->syncp);
776 rxsc_stats->stats.InPktsLate++;
777 u64_stats_update_end(&rxsc_stats->syncp);
778 return false;
779 }
780
781 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
782 u64_stats_update_begin(&rxsc_stats->syncp);
783 if (hdr->tci_an & MACSEC_TCI_E)
784 rxsc_stats->stats.InOctetsDecrypted += skb->len;
785 else
786 rxsc_stats->stats.InOctetsValidated += skb->len;
787 u64_stats_update_end(&rxsc_stats->syncp);
788 }
789
790 if (!macsec_skb_cb(skb)->valid) {
791 spin_unlock(&rx_sa->lock);
792
793 /* 10.6.5 */
794 if (hdr->tci_an & MACSEC_TCI_C ||
795 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
796 u64_stats_update_begin(&rxsc_stats->syncp);
797 rxsc_stats->stats.InPktsNotValid++;
798 u64_stats_update_end(&rxsc_stats->syncp);
799 return false;
800 }
801
802 u64_stats_update_begin(&rxsc_stats->syncp);
803 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
804 rxsc_stats->stats.InPktsInvalid++;
805 this_cpu_inc(rx_sa->stats->InPktsInvalid);
806 } else if (pn < lowest_pn) {
807 rxsc_stats->stats.InPktsDelayed++;
808 } else {
809 rxsc_stats->stats.InPktsUnchecked++;
810 }
811 u64_stats_update_end(&rxsc_stats->syncp);
812 } else {
813 u64_stats_update_begin(&rxsc_stats->syncp);
814 if (pn < lowest_pn) {
815 rxsc_stats->stats.InPktsDelayed++;
816 } else {
817 rxsc_stats->stats.InPktsOK++;
818 this_cpu_inc(rx_sa->stats->InPktsOK);
819 }
820 u64_stats_update_end(&rxsc_stats->syncp);
821
822 if (pn >= rx_sa->next_pn)
823 rx_sa->next_pn = pn + 1;
824 spin_unlock(&rx_sa->lock);
825 }
826
827 return true;
828 }
829
830 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
831 {
832 skb->pkt_type = PACKET_HOST;
833 skb->protocol = eth_type_trans(skb, dev);
834
835 skb_reset_network_header(skb);
836 if (!skb_transport_header_was_set(skb))
837 skb_reset_transport_header(skb);
838 skb_reset_mac_len(skb);
839 }
840
841 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
842 {
843 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
844 skb_pull(skb, hdr_len);
845 pskb_trim_unique(skb, skb->len - icv_len);
846 }
847
848 static void count_rx(struct net_device *dev, int len)
849 {
850 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
851
852 u64_stats_update_begin(&stats->syncp);
853 stats->rx_packets++;
854 stats->rx_bytes += len;
855 u64_stats_update_end(&stats->syncp);
856 }
857
858 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
859 {
860 struct sk_buff *skb = base->data;
861 struct net_device *dev = skb->dev;
862 struct macsec_dev *macsec = macsec_priv(dev);
863 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
864 int len, ret;
865 u32 pn;
866
867 aead_request_free(macsec_skb_cb(skb)->req);
868
869 rcu_read_lock_bh();
870 pn = ntohl(macsec_ethhdr(skb)->packet_number);
871 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
872 rcu_read_unlock_bh();
873 kfree_skb(skb);
874 goto out;
875 }
876
877 macsec_finalize_skb(skb, macsec->secy.icv_len,
878 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
879 macsec_reset_skb(skb, macsec->secy.netdev);
880
881 len = skb->len;
882 ret = netif_rx(skb);
883 if (ret == NET_RX_SUCCESS)
884 count_rx(dev, len);
885 else
886 macsec->secy.netdev->stats.rx_dropped++;
887
888 rcu_read_unlock_bh();
889
890 out:
891 macsec_rxsa_put(rx_sa);
892 dev_put(dev);
893 }
894
895 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
896 struct net_device *dev,
897 struct macsec_rx_sa *rx_sa,
898 sci_t sci,
899 struct macsec_secy *secy)
900 {
901 int ret;
902 struct scatterlist *sg;
903 unsigned char *iv;
904 struct aead_request *req;
905 struct macsec_eth_header *hdr;
906 u16 icv_len = secy->icv_len;
907
908 macsec_skb_cb(skb)->valid = false;
909 skb = skb_share_check(skb, GFP_ATOMIC);
910 if (!skb)
911 return ERR_PTR(-ENOMEM);
912
913 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg);
914 if (!req) {
915 kfree_skb(skb);
916 return ERR_PTR(-ENOMEM);
917 }
918
919 hdr = (struct macsec_eth_header *)skb->data;
920 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
921
922 sg_init_table(sg, MAX_SKB_FRAGS + 1);
923 skb_to_sgvec(skb, sg, 0, skb->len);
924
925 if (hdr->tci_an & MACSEC_TCI_E) {
926 /* confidentiality: ethernet + macsec header
927 * authenticated, encrypted payload
928 */
929 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
930
931 aead_request_set_crypt(req, sg, sg, len, iv);
932 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
933 skb = skb_unshare(skb, GFP_ATOMIC);
934 if (!skb) {
935 aead_request_free(req);
936 return ERR_PTR(-ENOMEM);
937 }
938 } else {
939 /* integrity only: all headers + data authenticated */
940 aead_request_set_crypt(req, sg, sg, icv_len, iv);
941 aead_request_set_ad(req, skb->len - icv_len);
942 }
943
944 macsec_skb_cb(skb)->req = req;
945 macsec_skb_cb(skb)->rx_sa = rx_sa;
946 skb->dev = dev;
947 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
948
949 dev_hold(dev);
950 ret = crypto_aead_decrypt(req);
951 if (ret == -EINPROGRESS) {
952 return ERR_PTR(ret);
953 } else if (ret != 0) {
954 /* decryption/authentication failed
955 * 10.6 if validateFrames is disabled, deliver anyway
956 */
957 if (ret != -EBADMSG) {
958 kfree_skb(skb);
959 skb = ERR_PTR(ret);
960 }
961 } else {
962 macsec_skb_cb(skb)->valid = true;
963 }
964 dev_put(dev);
965
966 aead_request_free(req);
967
968 return skb;
969 }
970
971 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
972 {
973 struct macsec_rx_sc *rx_sc;
974
975 for_each_rxsc(secy, rx_sc) {
976 if (rx_sc->sci == sci)
977 return rx_sc;
978 }
979
980 return NULL;
981 }
982
983 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
984 {
985 struct macsec_rx_sc *rx_sc;
986
987 for_each_rxsc_rtnl(secy, rx_sc) {
988 if (rx_sc->sci == sci)
989 return rx_sc;
990 }
991
992 return NULL;
993 }
994
995 static void handle_not_macsec(struct sk_buff *skb)
996 {
997 struct macsec_rxh_data *rxd;
998 struct macsec_dev *macsec;
999
1000 rcu_read_lock();
1001 rxd = macsec_data_rcu(skb->dev);
1002
1003 /* 10.6 If the management control validateFrames is not
1004 * Strict, frames without a SecTAG are received, counted, and
1005 * delivered to the Controlled Port
1006 */
1007 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1008 struct sk_buff *nskb;
1009 int ret;
1010 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1011
1012 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1013 u64_stats_update_begin(&secy_stats->syncp);
1014 secy_stats->stats.InPktsNoTag++;
1015 u64_stats_update_end(&secy_stats->syncp);
1016 continue;
1017 }
1018
1019 /* deliver on this port */
1020 nskb = skb_clone(skb, GFP_ATOMIC);
1021 if (!nskb)
1022 break;
1023
1024 nskb->dev = macsec->secy.netdev;
1025
1026 ret = netif_rx(nskb);
1027 if (ret == NET_RX_SUCCESS) {
1028 u64_stats_update_begin(&secy_stats->syncp);
1029 secy_stats->stats.InPktsUntagged++;
1030 u64_stats_update_end(&secy_stats->syncp);
1031 } else {
1032 macsec->secy.netdev->stats.rx_dropped++;
1033 }
1034 }
1035
1036 rcu_read_unlock();
1037 }
1038
1039 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1040 {
1041 struct sk_buff *skb = *pskb;
1042 struct net_device *dev = skb->dev;
1043 struct macsec_eth_header *hdr;
1044 struct macsec_secy *secy = NULL;
1045 struct macsec_rx_sc *rx_sc;
1046 struct macsec_rx_sa *rx_sa;
1047 struct macsec_rxh_data *rxd;
1048 struct macsec_dev *macsec;
1049 sci_t sci;
1050 u32 pn;
1051 bool cbit;
1052 struct pcpu_rx_sc_stats *rxsc_stats;
1053 struct pcpu_secy_stats *secy_stats;
1054 bool pulled_sci;
1055
1056 if (skb_headroom(skb) < ETH_HLEN)
1057 goto drop_direct;
1058
1059 hdr = macsec_ethhdr(skb);
1060 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1061 handle_not_macsec(skb);
1062
1063 /* and deliver to the uncontrolled port */
1064 return RX_HANDLER_PASS;
1065 }
1066
1067 skb = skb_unshare(skb, GFP_ATOMIC);
1068 if (!skb) {
1069 *pskb = NULL;
1070 return RX_HANDLER_CONSUMED;
1071 }
1072
1073 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1074 if (!pulled_sci) {
1075 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1076 goto drop_direct;
1077 }
1078
1079 hdr = macsec_ethhdr(skb);
1080
1081 /* Frames with a SecTAG that has the TCI E bit set but the C
1082 * bit clear are discarded, as this reserved encoding is used
1083 * to identify frames with a SecTAG that are not to be
1084 * delivered to the Controlled Port.
1085 */
1086 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1087 return RX_HANDLER_PASS;
1088
1089 /* now, pull the extra length */
1090 if (hdr->tci_an & MACSEC_TCI_SC) {
1091 if (!pulled_sci)
1092 goto drop_direct;
1093 }
1094
1095 /* ethernet header is part of crypto processing */
1096 skb_push(skb, ETH_HLEN);
1097
1098 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1099 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1100 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1101
1102 rcu_read_lock();
1103 rxd = macsec_data_rcu(skb->dev);
1104
1105 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1106 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1107
1108 if (sc) {
1109 secy = &macsec->secy;
1110 rx_sc = sc;
1111 break;
1112 }
1113 }
1114
1115 if (!secy)
1116 goto nosci;
1117
1118 dev = secy->netdev;
1119 macsec = macsec_priv(dev);
1120 secy_stats = this_cpu_ptr(macsec->stats);
1121 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1122
1123 if (!macsec_validate_skb(skb, secy->icv_len)) {
1124 u64_stats_update_begin(&secy_stats->syncp);
1125 secy_stats->stats.InPktsBadTag++;
1126 u64_stats_update_end(&secy_stats->syncp);
1127 goto drop_nosa;
1128 }
1129
1130 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1131 if (!rx_sa) {
1132 /* 10.6.1 if the SA is not in use */
1133
1134 /* If validateFrames is Strict or the C bit in the
1135 * SecTAG is set, discard
1136 */
1137 if (hdr->tci_an & MACSEC_TCI_C ||
1138 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1139 u64_stats_update_begin(&rxsc_stats->syncp);
1140 rxsc_stats->stats.InPktsNotUsingSA++;
1141 u64_stats_update_end(&rxsc_stats->syncp);
1142 goto drop_nosa;
1143 }
1144
1145 /* not Strict, the frame (with the SecTAG and ICV
1146 * removed) is delivered to the Controlled Port.
1147 */
1148 u64_stats_update_begin(&rxsc_stats->syncp);
1149 rxsc_stats->stats.InPktsUnusedSA++;
1150 u64_stats_update_end(&rxsc_stats->syncp);
1151 goto deliver;
1152 }
1153
1154 /* First, PN check to avoid decrypting obviously wrong packets */
1155 pn = ntohl(hdr->packet_number);
1156 if (secy->replay_protect) {
1157 bool late;
1158
1159 spin_lock(&rx_sa->lock);
1160 late = rx_sa->next_pn >= secy->replay_window &&
1161 pn < (rx_sa->next_pn - secy->replay_window);
1162 spin_unlock(&rx_sa->lock);
1163
1164 if (late) {
1165 u64_stats_update_begin(&rxsc_stats->syncp);
1166 rxsc_stats->stats.InPktsLate++;
1167 u64_stats_update_end(&rxsc_stats->syncp);
1168 goto drop;
1169 }
1170 }
1171
1172 /* Disabled && !changed text => skip validation */
1173 if (hdr->tci_an & MACSEC_TCI_C ||
1174 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1175 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1176
1177 if (IS_ERR(skb)) {
1178 /* the decrypt callback needs the reference */
1179 if (PTR_ERR(skb) != -EINPROGRESS)
1180 macsec_rxsa_put(rx_sa);
1181 rcu_read_unlock();
1182 *pskb = NULL;
1183 return RX_HANDLER_CONSUMED;
1184 }
1185
1186 if (!macsec_post_decrypt(skb, secy, pn))
1187 goto drop;
1188
1189 deliver:
1190 macsec_finalize_skb(skb, secy->icv_len,
1191 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1192 macsec_reset_skb(skb, secy->netdev);
1193
1194 if (rx_sa)
1195 macsec_rxsa_put(rx_sa);
1196 count_rx(dev, skb->len);
1197
1198 rcu_read_unlock();
1199
1200 *pskb = skb;
1201 return RX_HANDLER_ANOTHER;
1202
1203 drop:
1204 macsec_rxsa_put(rx_sa);
1205 drop_nosa:
1206 rcu_read_unlock();
1207 drop_direct:
1208 kfree_skb(skb);
1209 *pskb = NULL;
1210 return RX_HANDLER_CONSUMED;
1211
1212 nosci:
1213 /* 10.6.1 if the SC is not found */
1214 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1215 if (!cbit)
1216 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1217 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1218
1219 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1220 struct sk_buff *nskb;
1221 int ret;
1222
1223 secy_stats = this_cpu_ptr(macsec->stats);
1224
1225 /* If validateFrames is Strict or the C bit in the
1226 * SecTAG is set, discard
1227 */
1228 if (cbit ||
1229 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1230 u64_stats_update_begin(&secy_stats->syncp);
1231 secy_stats->stats.InPktsNoSCI++;
1232 u64_stats_update_end(&secy_stats->syncp);
1233 continue;
1234 }
1235
1236 /* not strict, the frame (with the SecTAG and ICV
1237 * removed) is delivered to the Controlled Port.
1238 */
1239 nskb = skb_clone(skb, GFP_ATOMIC);
1240 if (!nskb)
1241 break;
1242
1243 macsec_reset_skb(nskb, macsec->secy.netdev);
1244
1245 ret = netif_rx(nskb);
1246 if (ret == NET_RX_SUCCESS) {
1247 u64_stats_update_begin(&secy_stats->syncp);
1248 secy_stats->stats.InPktsUnknownSCI++;
1249 u64_stats_update_end(&secy_stats->syncp);
1250 } else {
1251 macsec->secy.netdev->stats.rx_dropped++;
1252 }
1253 }
1254
1255 rcu_read_unlock();
1256 *pskb = skb;
1257 return RX_HANDLER_PASS;
1258 }
1259
1260 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1261 {
1262 struct crypto_aead *tfm;
1263 int ret;
1264
1265 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1266 if (!tfm || IS_ERR(tfm))
1267 return NULL;
1268
1269 ret = crypto_aead_setkey(tfm, key, key_len);
1270 if (ret < 0) {
1271 crypto_free_aead(tfm);
1272 return NULL;
1273 }
1274
1275 ret = crypto_aead_setauthsize(tfm, icv_len);
1276 if (ret < 0) {
1277 crypto_free_aead(tfm);
1278 return NULL;
1279 }
1280
1281 return tfm;
1282 }
1283
1284 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1285 int icv_len)
1286 {
1287 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1288 if (!rx_sa->stats)
1289 return -1;
1290
1291 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1292 if (!rx_sa->key.tfm) {
1293 free_percpu(rx_sa->stats);
1294 return -1;
1295 }
1296
1297 rx_sa->active = false;
1298 rx_sa->next_pn = 1;
1299 atomic_set(&rx_sa->refcnt, 1);
1300 spin_lock_init(&rx_sa->lock);
1301
1302 return 0;
1303 }
1304
1305 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1306 {
1307 rx_sa->active = false;
1308
1309 macsec_rxsa_put(rx_sa);
1310 }
1311
1312 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1313 {
1314 int i;
1315
1316 for (i = 0; i < MACSEC_NUM_AN; i++) {
1317 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1318
1319 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1320 if (sa)
1321 clear_rx_sa(sa);
1322 }
1323
1324 macsec_rxsc_put(rx_sc);
1325 }
1326
1327 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1328 {
1329 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1330
1331 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1332 rx_sc;
1333 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1334 if (rx_sc->sci == sci) {
1335 if (rx_sc->active)
1336 secy->n_rx_sc--;
1337 rcu_assign_pointer(*rx_scp, rx_sc->next);
1338 return rx_sc;
1339 }
1340 }
1341
1342 return NULL;
1343 }
1344
1345 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1346 {
1347 struct macsec_rx_sc *rx_sc;
1348 struct macsec_dev *macsec;
1349 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1350 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1351 struct macsec_secy *secy;
1352
1353 list_for_each_entry(macsec, &rxd->secys, secys) {
1354 if (find_rx_sc_rtnl(&macsec->secy, sci))
1355 return ERR_PTR(-EEXIST);
1356 }
1357
1358 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1359 if (!rx_sc)
1360 return ERR_PTR(-ENOMEM);
1361
1362 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1363 if (!rx_sc->stats) {
1364 kfree(rx_sc);
1365 return ERR_PTR(-ENOMEM);
1366 }
1367
1368 rx_sc->sci = sci;
1369 rx_sc->active = true;
1370 atomic_set(&rx_sc->refcnt, 1);
1371
1372 secy = &macsec_priv(dev)->secy;
1373 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1374 rcu_assign_pointer(secy->rx_sc, rx_sc);
1375
1376 if (rx_sc->active)
1377 secy->n_rx_sc++;
1378
1379 return rx_sc;
1380 }
1381
1382 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1383 int icv_len)
1384 {
1385 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1386 if (!tx_sa->stats)
1387 return -1;
1388
1389 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1390 if (!tx_sa->key.tfm) {
1391 free_percpu(tx_sa->stats);
1392 return -1;
1393 }
1394
1395 tx_sa->active = false;
1396 atomic_set(&tx_sa->refcnt, 1);
1397 spin_lock_init(&tx_sa->lock);
1398
1399 return 0;
1400 }
1401
1402 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1403 {
1404 tx_sa->active = false;
1405
1406 macsec_txsa_put(tx_sa);
1407 }
1408
1409 static struct genl_family macsec_fam = {
1410 .id = GENL_ID_GENERATE,
1411 .name = MACSEC_GENL_NAME,
1412 .hdrsize = 0,
1413 .version = MACSEC_GENL_VERSION,
1414 .maxattr = MACSEC_ATTR_MAX,
1415 .netnsok = true,
1416 };
1417
1418 static struct net_device *get_dev_from_nl(struct net *net,
1419 struct nlattr **attrs)
1420 {
1421 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1422 struct net_device *dev;
1423
1424 dev = __dev_get_by_index(net, ifindex);
1425 if (!dev)
1426 return ERR_PTR(-ENODEV);
1427
1428 if (!netif_is_macsec(dev))
1429 return ERR_PTR(-ENODEV);
1430
1431 return dev;
1432 }
1433
1434 static sci_t nla_get_sci(const struct nlattr *nla)
1435 {
1436 return (__force sci_t)nla_get_u64(nla);
1437 }
1438
1439 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1440 int padattr)
1441 {
1442 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1443 }
1444
1445 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1446 struct nlattr **attrs,
1447 struct nlattr **tb_sa,
1448 struct net_device **devp,
1449 struct macsec_secy **secyp,
1450 struct macsec_tx_sc **scp,
1451 u8 *assoc_num)
1452 {
1453 struct net_device *dev;
1454 struct macsec_secy *secy;
1455 struct macsec_tx_sc *tx_sc;
1456 struct macsec_tx_sa *tx_sa;
1457
1458 if (!tb_sa[MACSEC_SA_ATTR_AN])
1459 return ERR_PTR(-EINVAL);
1460
1461 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1462
1463 dev = get_dev_from_nl(net, attrs);
1464 if (IS_ERR(dev))
1465 return ERR_CAST(dev);
1466
1467 if (*assoc_num >= MACSEC_NUM_AN)
1468 return ERR_PTR(-EINVAL);
1469
1470 secy = &macsec_priv(dev)->secy;
1471 tx_sc = &secy->tx_sc;
1472
1473 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1474 if (!tx_sa)
1475 return ERR_PTR(-ENODEV);
1476
1477 *devp = dev;
1478 *scp = tx_sc;
1479 *secyp = secy;
1480 return tx_sa;
1481 }
1482
1483 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1484 struct nlattr **attrs,
1485 struct nlattr **tb_rxsc,
1486 struct net_device **devp,
1487 struct macsec_secy **secyp)
1488 {
1489 struct net_device *dev;
1490 struct macsec_secy *secy;
1491 struct macsec_rx_sc *rx_sc;
1492 sci_t sci;
1493
1494 dev = get_dev_from_nl(net, attrs);
1495 if (IS_ERR(dev))
1496 return ERR_CAST(dev);
1497
1498 secy = &macsec_priv(dev)->secy;
1499
1500 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1501 return ERR_PTR(-EINVAL);
1502
1503 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1504 rx_sc = find_rx_sc_rtnl(secy, sci);
1505 if (!rx_sc)
1506 return ERR_PTR(-ENODEV);
1507
1508 *secyp = secy;
1509 *devp = dev;
1510
1511 return rx_sc;
1512 }
1513
1514 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1515 struct nlattr **attrs,
1516 struct nlattr **tb_rxsc,
1517 struct nlattr **tb_sa,
1518 struct net_device **devp,
1519 struct macsec_secy **secyp,
1520 struct macsec_rx_sc **scp,
1521 u8 *assoc_num)
1522 {
1523 struct macsec_rx_sc *rx_sc;
1524 struct macsec_rx_sa *rx_sa;
1525
1526 if (!tb_sa[MACSEC_SA_ATTR_AN])
1527 return ERR_PTR(-EINVAL);
1528
1529 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1530 if (*assoc_num >= MACSEC_NUM_AN)
1531 return ERR_PTR(-EINVAL);
1532
1533 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1534 if (IS_ERR(rx_sc))
1535 return ERR_CAST(rx_sc);
1536
1537 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1538 if (!rx_sa)
1539 return ERR_PTR(-ENODEV);
1540
1541 *scp = rx_sc;
1542 return rx_sa;
1543 }
1544
1545
1546 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1547 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1548 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1549 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1550 };
1551
1552 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1553 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1554 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1555 };
1556
1557 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1558 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1559 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1560 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1561 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1562 .len = MACSEC_KEYID_LEN, },
1563 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1564 .len = MACSEC_MAX_KEY_LEN, },
1565 };
1566
1567 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1568 {
1569 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1570 return -EINVAL;
1571
1572 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG],
1573 macsec_genl_sa_policy))
1574 return -EINVAL;
1575
1576 return 0;
1577 }
1578
1579 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1580 {
1581 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1582 return -EINVAL;
1583
1584 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG],
1585 macsec_genl_rxsc_policy))
1586 return -EINVAL;
1587
1588 return 0;
1589 }
1590
1591 static bool validate_add_rxsa(struct nlattr **attrs)
1592 {
1593 if (!attrs[MACSEC_SA_ATTR_AN] ||
1594 !attrs[MACSEC_SA_ATTR_KEY] ||
1595 !attrs[MACSEC_SA_ATTR_KEYID])
1596 return false;
1597
1598 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1599 return false;
1600
1601 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1602 return false;
1603
1604 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1605 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1606 return false;
1607 }
1608
1609 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1610 return false;
1611
1612 return true;
1613 }
1614
1615 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1616 {
1617 struct net_device *dev;
1618 struct nlattr **attrs = info->attrs;
1619 struct macsec_secy *secy;
1620 struct macsec_rx_sc *rx_sc;
1621 struct macsec_rx_sa *rx_sa;
1622 unsigned char assoc_num;
1623 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1624 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1625
1626 if (!attrs[MACSEC_ATTR_IFINDEX])
1627 return -EINVAL;
1628
1629 if (parse_sa_config(attrs, tb_sa))
1630 return -EINVAL;
1631
1632 if (parse_rxsc_config(attrs, tb_rxsc))
1633 return -EINVAL;
1634
1635 if (!validate_add_rxsa(tb_sa))
1636 return -EINVAL;
1637
1638 rtnl_lock();
1639 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1640 if (IS_ERR(rx_sc) || !macsec_rxsc_get(rx_sc)) {
1641 rtnl_unlock();
1642 return PTR_ERR(rx_sc);
1643 }
1644
1645 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1646
1647 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1648 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1649 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1650 rtnl_unlock();
1651 return -EINVAL;
1652 }
1653
1654 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1655 if (rx_sa) {
1656 rtnl_unlock();
1657 return -EBUSY;
1658 }
1659
1660 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1661 if (!rx_sa || init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1662 secy->key_len, secy->icv_len)) {
1663 kfree(rx_sa);
1664 rtnl_unlock();
1665 return -ENOMEM;
1666 }
1667
1668 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1669 spin_lock_bh(&rx_sa->lock);
1670 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1671 spin_unlock_bh(&rx_sa->lock);
1672 }
1673
1674 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1675 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1676
1677 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1678 rx_sa->sc = rx_sc;
1679 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1680
1681 rtnl_unlock();
1682
1683 return 0;
1684 }
1685
1686 static bool validate_add_rxsc(struct nlattr **attrs)
1687 {
1688 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1689 return false;
1690
1691 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1692 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1693 return false;
1694 }
1695
1696 return true;
1697 }
1698
1699 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1700 {
1701 struct net_device *dev;
1702 sci_t sci = MACSEC_UNDEF_SCI;
1703 struct nlattr **attrs = info->attrs;
1704 struct macsec_rx_sc *rx_sc;
1705 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1706
1707 if (!attrs[MACSEC_ATTR_IFINDEX])
1708 return -EINVAL;
1709
1710 if (parse_rxsc_config(attrs, tb_rxsc))
1711 return -EINVAL;
1712
1713 if (!validate_add_rxsc(tb_rxsc))
1714 return -EINVAL;
1715
1716 rtnl_lock();
1717 dev = get_dev_from_nl(genl_info_net(info), attrs);
1718 if (IS_ERR(dev)) {
1719 rtnl_unlock();
1720 return PTR_ERR(dev);
1721 }
1722
1723 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1724
1725 rx_sc = create_rx_sc(dev, sci);
1726 if (IS_ERR(rx_sc)) {
1727 rtnl_unlock();
1728 return PTR_ERR(rx_sc);
1729 }
1730
1731 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1732 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1733
1734 rtnl_unlock();
1735
1736 return 0;
1737 }
1738
1739 static bool validate_add_txsa(struct nlattr **attrs)
1740 {
1741 if (!attrs[MACSEC_SA_ATTR_AN] ||
1742 !attrs[MACSEC_SA_ATTR_PN] ||
1743 !attrs[MACSEC_SA_ATTR_KEY] ||
1744 !attrs[MACSEC_SA_ATTR_KEYID])
1745 return false;
1746
1747 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1748 return false;
1749
1750 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1751 return false;
1752
1753 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1754 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1755 return false;
1756 }
1757
1758 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1759 return false;
1760
1761 return true;
1762 }
1763
1764 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1765 {
1766 struct net_device *dev;
1767 struct nlattr **attrs = info->attrs;
1768 struct macsec_secy *secy;
1769 struct macsec_tx_sc *tx_sc;
1770 struct macsec_tx_sa *tx_sa;
1771 unsigned char assoc_num;
1772 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1773
1774 if (!attrs[MACSEC_ATTR_IFINDEX])
1775 return -EINVAL;
1776
1777 if (parse_sa_config(attrs, tb_sa))
1778 return -EINVAL;
1779
1780 if (!validate_add_txsa(tb_sa))
1781 return -EINVAL;
1782
1783 rtnl_lock();
1784 dev = get_dev_from_nl(genl_info_net(info), attrs);
1785 if (IS_ERR(dev)) {
1786 rtnl_unlock();
1787 return PTR_ERR(dev);
1788 }
1789
1790 secy = &macsec_priv(dev)->secy;
1791 tx_sc = &secy->tx_sc;
1792
1793 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1794
1795 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1796 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1797 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1798 rtnl_unlock();
1799 return -EINVAL;
1800 }
1801
1802 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1803 if (tx_sa) {
1804 rtnl_unlock();
1805 return -EBUSY;
1806 }
1807
1808 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1809 if (!tx_sa || init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1810 secy->key_len, secy->icv_len)) {
1811 kfree(tx_sa);
1812 rtnl_unlock();
1813 return -ENOMEM;
1814 }
1815
1816 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1817
1818 spin_lock_bh(&tx_sa->lock);
1819 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1820 spin_unlock_bh(&tx_sa->lock);
1821
1822 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1823 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1824
1825 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1826 secy->operational = true;
1827
1828 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1829
1830 rtnl_unlock();
1831
1832 return 0;
1833 }
1834
1835 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1836 {
1837 struct nlattr **attrs = info->attrs;
1838 struct net_device *dev;
1839 struct macsec_secy *secy;
1840 struct macsec_rx_sc *rx_sc;
1841 struct macsec_rx_sa *rx_sa;
1842 u8 assoc_num;
1843 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1844 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1845
1846 if (!attrs[MACSEC_ATTR_IFINDEX])
1847 return -EINVAL;
1848
1849 if (parse_sa_config(attrs, tb_sa))
1850 return -EINVAL;
1851
1852 if (parse_rxsc_config(attrs, tb_rxsc))
1853 return -EINVAL;
1854
1855 rtnl_lock();
1856 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1857 &dev, &secy, &rx_sc, &assoc_num);
1858 if (IS_ERR(rx_sa)) {
1859 rtnl_unlock();
1860 return PTR_ERR(rx_sa);
1861 }
1862
1863 if (rx_sa->active) {
1864 rtnl_unlock();
1865 return -EBUSY;
1866 }
1867
1868 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1869 clear_rx_sa(rx_sa);
1870
1871 rtnl_unlock();
1872
1873 return 0;
1874 }
1875
1876 static int macsec_del_rxsc(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_rx_sc *rx_sc;
1882 sci_t sci;
1883 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1884
1885 if (!attrs[MACSEC_ATTR_IFINDEX])
1886 return -EINVAL;
1887
1888 if (parse_rxsc_config(attrs, tb_rxsc))
1889 return -EINVAL;
1890
1891 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1892 return -EINVAL;
1893
1894 rtnl_lock();
1895 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1896 if (IS_ERR(dev)) {
1897 rtnl_unlock();
1898 return PTR_ERR(dev);
1899 }
1900
1901 secy = &macsec_priv(dev)->secy;
1902 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1903
1904 rx_sc = del_rx_sc(secy, sci);
1905 if (!rx_sc) {
1906 rtnl_unlock();
1907 return -ENODEV;
1908 }
1909
1910 free_rx_sc(rx_sc);
1911 rtnl_unlock();
1912
1913 return 0;
1914 }
1915
1916 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1917 {
1918 struct nlattr **attrs = info->attrs;
1919 struct net_device *dev;
1920 struct macsec_secy *secy;
1921 struct macsec_tx_sc *tx_sc;
1922 struct macsec_tx_sa *tx_sa;
1923 u8 assoc_num;
1924 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1925
1926 if (!attrs[MACSEC_ATTR_IFINDEX])
1927 return -EINVAL;
1928
1929 if (parse_sa_config(attrs, tb_sa))
1930 return -EINVAL;
1931
1932 rtnl_lock();
1933 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1934 &dev, &secy, &tx_sc, &assoc_num);
1935 if (IS_ERR(tx_sa)) {
1936 rtnl_unlock();
1937 return PTR_ERR(tx_sa);
1938 }
1939
1940 if (tx_sa->active) {
1941 rtnl_unlock();
1942 return -EBUSY;
1943 }
1944
1945 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
1946 clear_tx_sa(tx_sa);
1947
1948 rtnl_unlock();
1949
1950 return 0;
1951 }
1952
1953 static bool validate_upd_sa(struct nlattr **attrs)
1954 {
1955 if (!attrs[MACSEC_SA_ATTR_AN] ||
1956 attrs[MACSEC_SA_ATTR_KEY] ||
1957 attrs[MACSEC_SA_ATTR_KEYID])
1958 return false;
1959
1960 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1961 return false;
1962
1963 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1964 return false;
1965
1966 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1967 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1968 return false;
1969 }
1970
1971 return true;
1972 }
1973
1974 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
1975 {
1976 struct nlattr **attrs = info->attrs;
1977 struct net_device *dev;
1978 struct macsec_secy *secy;
1979 struct macsec_tx_sc *tx_sc;
1980 struct macsec_tx_sa *tx_sa;
1981 u8 assoc_num;
1982 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1983
1984 if (!attrs[MACSEC_ATTR_IFINDEX])
1985 return -EINVAL;
1986
1987 if (parse_sa_config(attrs, tb_sa))
1988 return -EINVAL;
1989
1990 if (!validate_upd_sa(tb_sa))
1991 return -EINVAL;
1992
1993 rtnl_lock();
1994 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1995 &dev, &secy, &tx_sc, &assoc_num);
1996 if (IS_ERR(tx_sa)) {
1997 rtnl_unlock();
1998 return PTR_ERR(tx_sa);
1999 }
2000
2001 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2002 spin_lock_bh(&tx_sa->lock);
2003 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2004 spin_unlock_bh(&tx_sa->lock);
2005 }
2006
2007 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2008 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2009
2010 if (assoc_num == tx_sc->encoding_sa)
2011 secy->operational = tx_sa->active;
2012
2013 rtnl_unlock();
2014
2015 return 0;
2016 }
2017
2018 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2019 {
2020 struct nlattr **attrs = info->attrs;
2021 struct net_device *dev;
2022 struct macsec_secy *secy;
2023 struct macsec_rx_sc *rx_sc;
2024 struct macsec_rx_sa *rx_sa;
2025 u8 assoc_num;
2026 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2027 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2028
2029 if (!attrs[MACSEC_ATTR_IFINDEX])
2030 return -EINVAL;
2031
2032 if (parse_rxsc_config(attrs, tb_rxsc))
2033 return -EINVAL;
2034
2035 if (parse_sa_config(attrs, tb_sa))
2036 return -EINVAL;
2037
2038 if (!validate_upd_sa(tb_sa))
2039 return -EINVAL;
2040
2041 rtnl_lock();
2042 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2043 &dev, &secy, &rx_sc, &assoc_num);
2044 if (IS_ERR(rx_sa)) {
2045 rtnl_unlock();
2046 return PTR_ERR(rx_sa);
2047 }
2048
2049 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2050 spin_lock_bh(&rx_sa->lock);
2051 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2052 spin_unlock_bh(&rx_sa->lock);
2053 }
2054
2055 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2056 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2057
2058 rtnl_unlock();
2059 return 0;
2060 }
2061
2062 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2063 {
2064 struct nlattr **attrs = info->attrs;
2065 struct net_device *dev;
2066 struct macsec_secy *secy;
2067 struct macsec_rx_sc *rx_sc;
2068 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2069
2070 if (!attrs[MACSEC_ATTR_IFINDEX])
2071 return -EINVAL;
2072
2073 if (parse_rxsc_config(attrs, tb_rxsc))
2074 return -EINVAL;
2075
2076 if (!validate_add_rxsc(tb_rxsc))
2077 return -EINVAL;
2078
2079 rtnl_lock();
2080 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2081 if (IS_ERR(rx_sc)) {
2082 rtnl_unlock();
2083 return PTR_ERR(rx_sc);
2084 }
2085
2086 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2087 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2088
2089 if (rx_sc->active != new)
2090 secy->n_rx_sc += new ? 1 : -1;
2091
2092 rx_sc->active = new;
2093 }
2094
2095 rtnl_unlock();
2096
2097 return 0;
2098 }
2099
2100 static int copy_tx_sa_stats(struct sk_buff *skb,
2101 struct macsec_tx_sa_stats __percpu *pstats)
2102 {
2103 struct macsec_tx_sa_stats sum = {0, };
2104 int cpu;
2105
2106 for_each_possible_cpu(cpu) {
2107 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2108
2109 sum.OutPktsProtected += stats->OutPktsProtected;
2110 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2111 }
2112
2113 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2114 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2115 return -EMSGSIZE;
2116
2117 return 0;
2118 }
2119
2120 static int copy_rx_sa_stats(struct sk_buff *skb,
2121 struct macsec_rx_sa_stats __percpu *pstats)
2122 {
2123 struct macsec_rx_sa_stats sum = {0, };
2124 int cpu;
2125
2126 for_each_possible_cpu(cpu) {
2127 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2128
2129 sum.InPktsOK += stats->InPktsOK;
2130 sum.InPktsInvalid += stats->InPktsInvalid;
2131 sum.InPktsNotValid += stats->InPktsNotValid;
2132 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2133 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2134 }
2135
2136 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2137 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2138 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2139 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2140 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2141 return -EMSGSIZE;
2142
2143 return 0;
2144 }
2145
2146 static int copy_rx_sc_stats(struct sk_buff *skb,
2147 struct pcpu_rx_sc_stats __percpu *pstats)
2148 {
2149 struct macsec_rx_sc_stats sum = {0, };
2150 int cpu;
2151
2152 for_each_possible_cpu(cpu) {
2153 const struct pcpu_rx_sc_stats *stats;
2154 struct macsec_rx_sc_stats tmp;
2155 unsigned int start;
2156
2157 stats = per_cpu_ptr(pstats, cpu);
2158 do {
2159 start = u64_stats_fetch_begin_irq(&stats->syncp);
2160 memcpy(&tmp, &stats->stats, sizeof(tmp));
2161 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2162
2163 sum.InOctetsValidated += tmp.InOctetsValidated;
2164 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2165 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2166 sum.InPktsDelayed += tmp.InPktsDelayed;
2167 sum.InPktsOK += tmp.InPktsOK;
2168 sum.InPktsInvalid += tmp.InPktsInvalid;
2169 sum.InPktsLate += tmp.InPktsLate;
2170 sum.InPktsNotValid += tmp.InPktsNotValid;
2171 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2172 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2173 }
2174
2175 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2176 sum.InOctetsValidated,
2177 MACSEC_RXSC_STATS_ATTR_PAD) ||
2178 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2179 sum.InOctetsDecrypted,
2180 MACSEC_RXSC_STATS_ATTR_PAD) ||
2181 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2182 sum.InPktsUnchecked,
2183 MACSEC_RXSC_STATS_ATTR_PAD) ||
2184 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2185 sum.InPktsDelayed,
2186 MACSEC_RXSC_STATS_ATTR_PAD) ||
2187 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2188 sum.InPktsOK,
2189 MACSEC_RXSC_STATS_ATTR_PAD) ||
2190 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2191 sum.InPktsInvalid,
2192 MACSEC_RXSC_STATS_ATTR_PAD) ||
2193 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2194 sum.InPktsLate,
2195 MACSEC_RXSC_STATS_ATTR_PAD) ||
2196 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2197 sum.InPktsNotValid,
2198 MACSEC_RXSC_STATS_ATTR_PAD) ||
2199 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2200 sum.InPktsNotUsingSA,
2201 MACSEC_RXSC_STATS_ATTR_PAD) ||
2202 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2203 sum.InPktsUnusedSA,
2204 MACSEC_RXSC_STATS_ATTR_PAD))
2205 return -EMSGSIZE;
2206
2207 return 0;
2208 }
2209
2210 static int copy_tx_sc_stats(struct sk_buff *skb,
2211 struct pcpu_tx_sc_stats __percpu *pstats)
2212 {
2213 struct macsec_tx_sc_stats sum = {0, };
2214 int cpu;
2215
2216 for_each_possible_cpu(cpu) {
2217 const struct pcpu_tx_sc_stats *stats;
2218 struct macsec_tx_sc_stats tmp;
2219 unsigned int start;
2220
2221 stats = per_cpu_ptr(pstats, cpu);
2222 do {
2223 start = u64_stats_fetch_begin_irq(&stats->syncp);
2224 memcpy(&tmp, &stats->stats, sizeof(tmp));
2225 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2226
2227 sum.OutPktsProtected += tmp.OutPktsProtected;
2228 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2229 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2230 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2231 }
2232
2233 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2234 sum.OutPktsProtected,
2235 MACSEC_TXSC_STATS_ATTR_PAD) ||
2236 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2237 sum.OutPktsEncrypted,
2238 MACSEC_TXSC_STATS_ATTR_PAD) ||
2239 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2240 sum.OutOctetsProtected,
2241 MACSEC_TXSC_STATS_ATTR_PAD) ||
2242 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2243 sum.OutOctetsEncrypted,
2244 MACSEC_TXSC_STATS_ATTR_PAD))
2245 return -EMSGSIZE;
2246
2247 return 0;
2248 }
2249
2250 static int copy_secy_stats(struct sk_buff *skb,
2251 struct pcpu_secy_stats __percpu *pstats)
2252 {
2253 struct macsec_dev_stats sum = {0, };
2254 int cpu;
2255
2256 for_each_possible_cpu(cpu) {
2257 const struct pcpu_secy_stats *stats;
2258 struct macsec_dev_stats tmp;
2259 unsigned int start;
2260
2261 stats = per_cpu_ptr(pstats, cpu);
2262 do {
2263 start = u64_stats_fetch_begin_irq(&stats->syncp);
2264 memcpy(&tmp, &stats->stats, sizeof(tmp));
2265 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2266
2267 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2268 sum.InPktsUntagged += tmp.InPktsUntagged;
2269 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2270 sum.InPktsNoTag += tmp.InPktsNoTag;
2271 sum.InPktsBadTag += tmp.InPktsBadTag;
2272 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2273 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2274 sum.InPktsOverrun += tmp.InPktsOverrun;
2275 }
2276
2277 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2278 sum.OutPktsUntagged,
2279 MACSEC_SECY_STATS_ATTR_PAD) ||
2280 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2281 sum.InPktsUntagged,
2282 MACSEC_SECY_STATS_ATTR_PAD) ||
2283 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2284 sum.OutPktsTooLong,
2285 MACSEC_SECY_STATS_ATTR_PAD) ||
2286 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2287 sum.InPktsNoTag,
2288 MACSEC_SECY_STATS_ATTR_PAD) ||
2289 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2290 sum.InPktsBadTag,
2291 MACSEC_SECY_STATS_ATTR_PAD) ||
2292 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2293 sum.InPktsUnknownSCI,
2294 MACSEC_SECY_STATS_ATTR_PAD) ||
2295 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2296 sum.InPktsNoSCI,
2297 MACSEC_SECY_STATS_ATTR_PAD) ||
2298 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2299 sum.InPktsOverrun,
2300 MACSEC_SECY_STATS_ATTR_PAD))
2301 return -EMSGSIZE;
2302
2303 return 0;
2304 }
2305
2306 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2307 {
2308 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2309 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2310
2311 if (!secy_nest)
2312 return 1;
2313
2314 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2315 MACSEC_SECY_ATTR_PAD) ||
2316 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2317 MACSEC_DEFAULT_CIPHER_ID,
2318 MACSEC_SECY_ATTR_PAD) ||
2319 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2320 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2321 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2322 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2323 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2324 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2325 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2326 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2327 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2328 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2329 goto cancel;
2330
2331 if (secy->replay_protect) {
2332 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2333 goto cancel;
2334 }
2335
2336 nla_nest_end(skb, secy_nest);
2337 return 0;
2338
2339 cancel:
2340 nla_nest_cancel(skb, secy_nest);
2341 return 1;
2342 }
2343
2344 static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2345 struct sk_buff *skb, struct netlink_callback *cb)
2346 {
2347 struct macsec_rx_sc *rx_sc;
2348 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2349 struct nlattr *txsa_list, *rxsc_list;
2350 int i, j;
2351 void *hdr;
2352 struct nlattr *attr;
2353
2354 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2355 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2356 if (!hdr)
2357 return -EMSGSIZE;
2358
2359 genl_dump_check_consistent(cb, hdr, &macsec_fam);
2360
2361 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2362 goto nla_put_failure;
2363
2364 if (nla_put_secy(secy, skb))
2365 goto nla_put_failure;
2366
2367 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2368 if (!attr)
2369 goto nla_put_failure;
2370 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2371 nla_nest_cancel(skb, attr);
2372 goto nla_put_failure;
2373 }
2374 nla_nest_end(skb, attr);
2375
2376 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2377 if (!attr)
2378 goto nla_put_failure;
2379 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2380 nla_nest_cancel(skb, attr);
2381 goto nla_put_failure;
2382 }
2383 nla_nest_end(skb, attr);
2384
2385 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2386 if (!txsa_list)
2387 goto nla_put_failure;
2388 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2389 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2390 struct nlattr *txsa_nest;
2391
2392 if (!tx_sa)
2393 continue;
2394
2395 txsa_nest = nla_nest_start(skb, j++);
2396 if (!txsa_nest) {
2397 nla_nest_cancel(skb, txsa_list);
2398 goto nla_put_failure;
2399 }
2400
2401 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2402 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2403 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2404 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2405 nla_nest_cancel(skb, txsa_nest);
2406 nla_nest_cancel(skb, txsa_list);
2407 goto nla_put_failure;
2408 }
2409
2410 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2411 if (!attr) {
2412 nla_nest_cancel(skb, txsa_nest);
2413 nla_nest_cancel(skb, txsa_list);
2414 goto nla_put_failure;
2415 }
2416 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2417 nla_nest_cancel(skb, attr);
2418 nla_nest_cancel(skb, txsa_nest);
2419 nla_nest_cancel(skb, txsa_list);
2420 goto nla_put_failure;
2421 }
2422 nla_nest_end(skb, attr);
2423
2424 nla_nest_end(skb, txsa_nest);
2425 }
2426 nla_nest_end(skb, txsa_list);
2427
2428 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2429 if (!rxsc_list)
2430 goto nla_put_failure;
2431
2432 j = 1;
2433 for_each_rxsc_rtnl(secy, rx_sc) {
2434 int k;
2435 struct nlattr *rxsa_list;
2436 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2437
2438 if (!rxsc_nest) {
2439 nla_nest_cancel(skb, rxsc_list);
2440 goto nla_put_failure;
2441 }
2442
2443 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2444 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
2445 MACSEC_RXSC_ATTR_PAD)) {
2446 nla_nest_cancel(skb, rxsc_nest);
2447 nla_nest_cancel(skb, rxsc_list);
2448 goto nla_put_failure;
2449 }
2450
2451 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2452 if (!attr) {
2453 nla_nest_cancel(skb, rxsc_nest);
2454 nla_nest_cancel(skb, rxsc_list);
2455 goto nla_put_failure;
2456 }
2457 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2458 nla_nest_cancel(skb, attr);
2459 nla_nest_cancel(skb, rxsc_nest);
2460 nla_nest_cancel(skb, rxsc_list);
2461 goto nla_put_failure;
2462 }
2463 nla_nest_end(skb, attr);
2464
2465 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2466 if (!rxsa_list) {
2467 nla_nest_cancel(skb, rxsc_nest);
2468 nla_nest_cancel(skb, rxsc_list);
2469 goto nla_put_failure;
2470 }
2471
2472 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2473 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2474 struct nlattr *rxsa_nest;
2475
2476 if (!rx_sa)
2477 continue;
2478
2479 rxsa_nest = nla_nest_start(skb, k++);
2480 if (!rxsa_nest) {
2481 nla_nest_cancel(skb, rxsa_list);
2482 nla_nest_cancel(skb, rxsc_nest);
2483 nla_nest_cancel(skb, rxsc_list);
2484 goto nla_put_failure;
2485 }
2486
2487 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2488 if (!attr) {
2489 nla_nest_cancel(skb, rxsa_list);
2490 nla_nest_cancel(skb, rxsc_nest);
2491 nla_nest_cancel(skb, rxsc_list);
2492 goto nla_put_failure;
2493 }
2494 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2495 nla_nest_cancel(skb, attr);
2496 nla_nest_cancel(skb, rxsa_list);
2497 nla_nest_cancel(skb, rxsc_nest);
2498 nla_nest_cancel(skb, rxsc_list);
2499 goto nla_put_failure;
2500 }
2501 nla_nest_end(skb, attr);
2502
2503 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2504 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2505 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2506 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2507 nla_nest_cancel(skb, rxsa_nest);
2508 nla_nest_cancel(skb, rxsc_nest);
2509 nla_nest_cancel(skb, rxsc_list);
2510 goto nla_put_failure;
2511 }
2512 nla_nest_end(skb, rxsa_nest);
2513 }
2514
2515 nla_nest_end(skb, rxsa_list);
2516 nla_nest_end(skb, rxsc_nest);
2517 }
2518
2519 nla_nest_end(skb, rxsc_list);
2520
2521 genlmsg_end(skb, hdr);
2522
2523 return 0;
2524
2525 nla_put_failure:
2526 genlmsg_cancel(skb, hdr);
2527 return -EMSGSIZE;
2528 }
2529
2530 static int macsec_generation = 1; /* protected by RTNL */
2531
2532 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2533 {
2534 struct net *net = sock_net(skb->sk);
2535 struct net_device *dev;
2536 int dev_idx, d;
2537
2538 dev_idx = cb->args[0];
2539
2540 d = 0;
2541 rtnl_lock();
2542
2543 cb->seq = macsec_generation;
2544
2545 for_each_netdev(net, dev) {
2546 struct macsec_secy *secy;
2547
2548 if (d < dev_idx)
2549 goto next;
2550
2551 if (!netif_is_macsec(dev))
2552 goto next;
2553
2554 secy = &macsec_priv(dev)->secy;
2555 if (dump_secy(secy, dev, skb, cb) < 0)
2556 goto done;
2557 next:
2558 d++;
2559 }
2560
2561 done:
2562 rtnl_unlock();
2563 cb->args[0] = d;
2564 return skb->len;
2565 }
2566
2567 static const struct genl_ops macsec_genl_ops[] = {
2568 {
2569 .cmd = MACSEC_CMD_GET_TXSC,
2570 .dumpit = macsec_dump_txsc,
2571 .policy = macsec_genl_policy,
2572 },
2573 {
2574 .cmd = MACSEC_CMD_ADD_RXSC,
2575 .doit = macsec_add_rxsc,
2576 .policy = macsec_genl_policy,
2577 .flags = GENL_ADMIN_PERM,
2578 },
2579 {
2580 .cmd = MACSEC_CMD_DEL_RXSC,
2581 .doit = macsec_del_rxsc,
2582 .policy = macsec_genl_policy,
2583 .flags = GENL_ADMIN_PERM,
2584 },
2585 {
2586 .cmd = MACSEC_CMD_UPD_RXSC,
2587 .doit = macsec_upd_rxsc,
2588 .policy = macsec_genl_policy,
2589 .flags = GENL_ADMIN_PERM,
2590 },
2591 {
2592 .cmd = MACSEC_CMD_ADD_TXSA,
2593 .doit = macsec_add_txsa,
2594 .policy = macsec_genl_policy,
2595 .flags = GENL_ADMIN_PERM,
2596 },
2597 {
2598 .cmd = MACSEC_CMD_DEL_TXSA,
2599 .doit = macsec_del_txsa,
2600 .policy = macsec_genl_policy,
2601 .flags = GENL_ADMIN_PERM,
2602 },
2603 {
2604 .cmd = MACSEC_CMD_UPD_TXSA,
2605 .doit = macsec_upd_txsa,
2606 .policy = macsec_genl_policy,
2607 .flags = GENL_ADMIN_PERM,
2608 },
2609 {
2610 .cmd = MACSEC_CMD_ADD_RXSA,
2611 .doit = macsec_add_rxsa,
2612 .policy = macsec_genl_policy,
2613 .flags = GENL_ADMIN_PERM,
2614 },
2615 {
2616 .cmd = MACSEC_CMD_DEL_RXSA,
2617 .doit = macsec_del_rxsa,
2618 .policy = macsec_genl_policy,
2619 .flags = GENL_ADMIN_PERM,
2620 },
2621 {
2622 .cmd = MACSEC_CMD_UPD_RXSA,
2623 .doit = macsec_upd_rxsa,
2624 .policy = macsec_genl_policy,
2625 .flags = GENL_ADMIN_PERM,
2626 },
2627 };
2628
2629 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2630 struct net_device *dev)
2631 {
2632 struct macsec_dev *macsec = netdev_priv(dev);
2633 struct macsec_secy *secy = &macsec->secy;
2634 struct pcpu_secy_stats *secy_stats;
2635 int ret, len;
2636
2637 /* 10.5 */
2638 if (!secy->protect_frames) {
2639 secy_stats = this_cpu_ptr(macsec->stats);
2640 u64_stats_update_begin(&secy_stats->syncp);
2641 secy_stats->stats.OutPktsUntagged++;
2642 u64_stats_update_end(&secy_stats->syncp);
2643 skb->dev = macsec->real_dev;
2644 len = skb->len;
2645 ret = dev_queue_xmit(skb);
2646 count_tx(dev, ret, len);
2647 return ret;
2648 }
2649
2650 if (!secy->operational) {
2651 kfree_skb(skb);
2652 dev->stats.tx_dropped++;
2653 return NETDEV_TX_OK;
2654 }
2655
2656 skb = macsec_encrypt(skb, dev);
2657 if (IS_ERR(skb)) {
2658 if (PTR_ERR(skb) != -EINPROGRESS)
2659 dev->stats.tx_dropped++;
2660 return NETDEV_TX_OK;
2661 }
2662
2663 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2664
2665 macsec_encrypt_finish(skb, dev);
2666 len = skb->len;
2667 ret = dev_queue_xmit(skb);
2668 count_tx(dev, ret, len);
2669 return ret;
2670 }
2671
2672 #define MACSEC_FEATURES \
2673 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2674 static int macsec_dev_init(struct net_device *dev)
2675 {
2676 struct macsec_dev *macsec = macsec_priv(dev);
2677 struct net_device *real_dev = macsec->real_dev;
2678
2679 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2680 if (!dev->tstats)
2681 return -ENOMEM;
2682
2683 dev->features = real_dev->features & MACSEC_FEATURES;
2684 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2685
2686 dev->needed_headroom = real_dev->needed_headroom +
2687 MACSEC_NEEDED_HEADROOM;
2688 dev->needed_tailroom = real_dev->needed_tailroom +
2689 MACSEC_NEEDED_TAILROOM;
2690
2691 if (is_zero_ether_addr(dev->dev_addr))
2692 eth_hw_addr_inherit(dev, real_dev);
2693 if (is_zero_ether_addr(dev->broadcast))
2694 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2695
2696 return 0;
2697 }
2698
2699 static void macsec_dev_uninit(struct net_device *dev)
2700 {
2701 free_percpu(dev->tstats);
2702 }
2703
2704 static netdev_features_t macsec_fix_features(struct net_device *dev,
2705 netdev_features_t features)
2706 {
2707 struct macsec_dev *macsec = macsec_priv(dev);
2708 struct net_device *real_dev = macsec->real_dev;
2709
2710 features &= real_dev->features & MACSEC_FEATURES;
2711 features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2712
2713 return features;
2714 }
2715
2716 static int macsec_dev_open(struct net_device *dev)
2717 {
2718 struct macsec_dev *macsec = macsec_priv(dev);
2719 struct net_device *real_dev = macsec->real_dev;
2720 int err;
2721
2722 if (!(real_dev->flags & IFF_UP))
2723 return -ENETDOWN;
2724
2725 err = dev_uc_add(real_dev, dev->dev_addr);
2726 if (err < 0)
2727 return err;
2728
2729 if (dev->flags & IFF_ALLMULTI) {
2730 err = dev_set_allmulti(real_dev, 1);
2731 if (err < 0)
2732 goto del_unicast;
2733 }
2734
2735 if (dev->flags & IFF_PROMISC) {
2736 err = dev_set_promiscuity(real_dev, 1);
2737 if (err < 0)
2738 goto clear_allmulti;
2739 }
2740
2741 if (netif_carrier_ok(real_dev))
2742 netif_carrier_on(dev);
2743
2744 return 0;
2745 clear_allmulti:
2746 if (dev->flags & IFF_ALLMULTI)
2747 dev_set_allmulti(real_dev, -1);
2748 del_unicast:
2749 dev_uc_del(real_dev, dev->dev_addr);
2750 netif_carrier_off(dev);
2751 return err;
2752 }
2753
2754 static int macsec_dev_stop(struct net_device *dev)
2755 {
2756 struct macsec_dev *macsec = macsec_priv(dev);
2757 struct net_device *real_dev = macsec->real_dev;
2758
2759 netif_carrier_off(dev);
2760
2761 dev_mc_unsync(real_dev, dev);
2762 dev_uc_unsync(real_dev, dev);
2763
2764 if (dev->flags & IFF_ALLMULTI)
2765 dev_set_allmulti(real_dev, -1);
2766
2767 if (dev->flags & IFF_PROMISC)
2768 dev_set_promiscuity(real_dev, -1);
2769
2770 dev_uc_del(real_dev, dev->dev_addr);
2771
2772 return 0;
2773 }
2774
2775 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2776 {
2777 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2778
2779 if (!(dev->flags & IFF_UP))
2780 return;
2781
2782 if (change & IFF_ALLMULTI)
2783 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2784
2785 if (change & IFF_PROMISC)
2786 dev_set_promiscuity(real_dev,
2787 dev->flags & IFF_PROMISC ? 1 : -1);
2788 }
2789
2790 static void macsec_dev_set_rx_mode(struct net_device *dev)
2791 {
2792 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2793
2794 dev_mc_sync(real_dev, dev);
2795 dev_uc_sync(real_dev, dev);
2796 }
2797
2798 static int macsec_set_mac_address(struct net_device *dev, void *p)
2799 {
2800 struct macsec_dev *macsec = macsec_priv(dev);
2801 struct net_device *real_dev = macsec->real_dev;
2802 struct sockaddr *addr = p;
2803 int err;
2804
2805 if (!is_valid_ether_addr(addr->sa_data))
2806 return -EADDRNOTAVAIL;
2807
2808 if (!(dev->flags & IFF_UP))
2809 goto out;
2810
2811 err = dev_uc_add(real_dev, addr->sa_data);
2812 if (err < 0)
2813 return err;
2814
2815 dev_uc_del(real_dev, dev->dev_addr);
2816
2817 out:
2818 ether_addr_copy(dev->dev_addr, addr->sa_data);
2819 return 0;
2820 }
2821
2822 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2823 {
2824 struct macsec_dev *macsec = macsec_priv(dev);
2825 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2826
2827 if (macsec->real_dev->mtu - extra < new_mtu)
2828 return -ERANGE;
2829
2830 dev->mtu = new_mtu;
2831
2832 return 0;
2833 }
2834
2835 static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev,
2836 struct rtnl_link_stats64 *s)
2837 {
2838 int cpu;
2839
2840 if (!dev->tstats)
2841 return s;
2842
2843 for_each_possible_cpu(cpu) {
2844 struct pcpu_sw_netstats *stats;
2845 struct pcpu_sw_netstats tmp;
2846 int start;
2847
2848 stats = per_cpu_ptr(dev->tstats, cpu);
2849 do {
2850 start = u64_stats_fetch_begin_irq(&stats->syncp);
2851 tmp.rx_packets = stats->rx_packets;
2852 tmp.rx_bytes = stats->rx_bytes;
2853 tmp.tx_packets = stats->tx_packets;
2854 tmp.tx_bytes = stats->tx_bytes;
2855 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2856
2857 s->rx_packets += tmp.rx_packets;
2858 s->rx_bytes += tmp.rx_bytes;
2859 s->tx_packets += tmp.tx_packets;
2860 s->tx_bytes += tmp.tx_bytes;
2861 }
2862
2863 s->rx_dropped = dev->stats.rx_dropped;
2864 s->tx_dropped = dev->stats.tx_dropped;
2865
2866 return s;
2867 }
2868
2869 static int macsec_get_iflink(const struct net_device *dev)
2870 {
2871 return macsec_priv(dev)->real_dev->ifindex;
2872 }
2873
2874 static const struct net_device_ops macsec_netdev_ops = {
2875 .ndo_init = macsec_dev_init,
2876 .ndo_uninit = macsec_dev_uninit,
2877 .ndo_open = macsec_dev_open,
2878 .ndo_stop = macsec_dev_stop,
2879 .ndo_fix_features = macsec_fix_features,
2880 .ndo_change_mtu = macsec_change_mtu,
2881 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2882 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2883 .ndo_set_mac_address = macsec_set_mac_address,
2884 .ndo_start_xmit = macsec_start_xmit,
2885 .ndo_get_stats64 = macsec_get_stats64,
2886 .ndo_get_iflink = macsec_get_iflink,
2887 };
2888
2889 static const struct device_type macsec_type = {
2890 .name = "macsec",
2891 };
2892
2893 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2894 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2895 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2896 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2897 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2898 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2899 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2900 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
2901 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
2902 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
2903 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
2904 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
2905 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
2906 };
2907
2908 static void macsec_free_netdev(struct net_device *dev)
2909 {
2910 struct macsec_dev *macsec = macsec_priv(dev);
2911 struct net_device *real_dev = macsec->real_dev;
2912
2913 free_percpu(macsec->stats);
2914 free_percpu(macsec->secy.tx_sc.stats);
2915
2916 dev_put(real_dev);
2917 free_netdev(dev);
2918 }
2919
2920 static void macsec_setup(struct net_device *dev)
2921 {
2922 ether_setup(dev);
2923 dev->priv_flags |= IFF_NO_QUEUE;
2924 dev->netdev_ops = &macsec_netdev_ops;
2925 dev->destructor = macsec_free_netdev;
2926
2927 eth_zero_addr(dev->broadcast);
2928 }
2929
2930 static void macsec_changelink_common(struct net_device *dev,
2931 struct nlattr *data[])
2932 {
2933 struct macsec_secy *secy;
2934 struct macsec_tx_sc *tx_sc;
2935
2936 secy = &macsec_priv(dev)->secy;
2937 tx_sc = &secy->tx_sc;
2938
2939 if (data[IFLA_MACSEC_ENCODING_SA]) {
2940 struct macsec_tx_sa *tx_sa;
2941
2942 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
2943 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
2944
2945 secy->operational = tx_sa && tx_sa->active;
2946 }
2947
2948 if (data[IFLA_MACSEC_WINDOW])
2949 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
2950
2951 if (data[IFLA_MACSEC_ENCRYPT])
2952 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
2953
2954 if (data[IFLA_MACSEC_PROTECT])
2955 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
2956
2957 if (data[IFLA_MACSEC_INC_SCI])
2958 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
2959
2960 if (data[IFLA_MACSEC_ES])
2961 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
2962
2963 if (data[IFLA_MACSEC_SCB])
2964 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
2965
2966 if (data[IFLA_MACSEC_REPLAY_PROTECT])
2967 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
2968
2969 if (data[IFLA_MACSEC_VALIDATION])
2970 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
2971 }
2972
2973 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
2974 struct nlattr *data[])
2975 {
2976 if (!data)
2977 return 0;
2978
2979 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
2980 data[IFLA_MACSEC_ICV_LEN] ||
2981 data[IFLA_MACSEC_SCI] ||
2982 data[IFLA_MACSEC_PORT])
2983 return -EINVAL;
2984
2985 macsec_changelink_common(dev, data);
2986
2987 return 0;
2988 }
2989
2990 static void macsec_del_dev(struct macsec_dev *macsec)
2991 {
2992 int i;
2993
2994 while (macsec->secy.rx_sc) {
2995 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
2996
2997 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
2998 free_rx_sc(rx_sc);
2999 }
3000
3001 for (i = 0; i < MACSEC_NUM_AN; i++) {
3002 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3003
3004 if (sa) {
3005 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3006 clear_tx_sa(sa);
3007 }
3008 }
3009 }
3010
3011 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3012 {
3013 struct macsec_dev *macsec = macsec_priv(dev);
3014 struct net_device *real_dev = macsec->real_dev;
3015 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3016
3017 macsec_generation++;
3018
3019 unregister_netdevice_queue(dev, head);
3020 list_del_rcu(&macsec->secys);
3021 if (list_empty(&rxd->secys)) {
3022 netdev_rx_handler_unregister(real_dev);
3023 kfree(rxd);
3024 }
3025
3026 macsec_del_dev(macsec);
3027 }
3028
3029 static int register_macsec_dev(struct net_device *real_dev,
3030 struct net_device *dev)
3031 {
3032 struct macsec_dev *macsec = macsec_priv(dev);
3033 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3034
3035 if (!rxd) {
3036 int err;
3037
3038 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3039 if (!rxd)
3040 return -ENOMEM;
3041
3042 INIT_LIST_HEAD(&rxd->secys);
3043
3044 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3045 rxd);
3046 if (err < 0) {
3047 kfree(rxd);
3048 return err;
3049 }
3050 }
3051
3052 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3053 return 0;
3054 }
3055
3056 static bool sci_exists(struct net_device *dev, sci_t sci)
3057 {
3058 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3059 struct macsec_dev *macsec;
3060
3061 list_for_each_entry(macsec, &rxd->secys, secys) {
3062 if (macsec->secy.sci == sci)
3063 return true;
3064 }
3065
3066 return false;
3067 }
3068
3069 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3070 {
3071 return make_sci(dev->dev_addr, port);
3072 }
3073
3074 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3075 {
3076 struct macsec_dev *macsec = macsec_priv(dev);
3077 struct macsec_secy *secy = &macsec->secy;
3078
3079 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3080 if (!macsec->stats)
3081 return -ENOMEM;
3082
3083 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3084 if (!secy->tx_sc.stats) {
3085 free_percpu(macsec->stats);
3086 return -ENOMEM;
3087 }
3088
3089 if (sci == MACSEC_UNDEF_SCI)
3090 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3091
3092 secy->netdev = dev;
3093 secy->operational = true;
3094 secy->key_len = DEFAULT_SAK_LEN;
3095 secy->icv_len = icv_len;
3096 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3097 secy->protect_frames = true;
3098 secy->replay_protect = false;
3099
3100 secy->sci = sci;
3101 secy->tx_sc.active = true;
3102 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3103 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3104 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3105 secy->tx_sc.end_station = false;
3106 secy->tx_sc.scb = false;
3107
3108 return 0;
3109 }
3110
3111 static int macsec_newlink(struct net *net, struct net_device *dev,
3112 struct nlattr *tb[], struct nlattr *data[])
3113 {
3114 struct macsec_dev *macsec = macsec_priv(dev);
3115 struct net_device *real_dev;
3116 int err;
3117 sci_t sci;
3118 u8 icv_len = DEFAULT_ICV_LEN;
3119 rx_handler_func_t *rx_handler;
3120
3121 if (!tb[IFLA_LINK])
3122 return -EINVAL;
3123 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3124 if (!real_dev)
3125 return -ENODEV;
3126
3127 dev->priv_flags |= IFF_MACSEC;
3128
3129 macsec->real_dev = real_dev;
3130
3131 if (data && data[IFLA_MACSEC_ICV_LEN])
3132 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3133 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3134
3135 rx_handler = rtnl_dereference(real_dev->rx_handler);
3136 if (rx_handler && rx_handler != macsec_handle_frame)
3137 return -EBUSY;
3138
3139 err = register_netdevice(dev);
3140 if (err < 0)
3141 return err;
3142
3143 /* need to be already registered so that ->init has run and
3144 * the MAC addr is set
3145 */
3146 if (data && data[IFLA_MACSEC_SCI])
3147 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3148 else if (data && data[IFLA_MACSEC_PORT])
3149 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3150 else
3151 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3152
3153 if (rx_handler && sci_exists(real_dev, sci)) {
3154 err = -EBUSY;
3155 goto unregister;
3156 }
3157
3158 err = macsec_add_dev(dev, sci, icv_len);
3159 if (err)
3160 goto unregister;
3161
3162 if (data)
3163 macsec_changelink_common(dev, data);
3164
3165 err = register_macsec_dev(real_dev, dev);
3166 if (err < 0)
3167 goto del_dev;
3168
3169 macsec_generation++;
3170
3171 dev_hold(real_dev);
3172
3173 return 0;
3174
3175 del_dev:
3176 macsec_del_dev(macsec);
3177 unregister:
3178 unregister_netdevice(dev);
3179 return err;
3180 }
3181
3182 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
3183 {
3184 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3185 u8 icv_len = DEFAULT_ICV_LEN;
3186 int flag;
3187 bool es, scb, sci;
3188
3189 if (!data)
3190 return 0;
3191
3192 if (data[IFLA_MACSEC_CIPHER_SUITE])
3193 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3194
3195 if (data[IFLA_MACSEC_ICV_LEN])
3196 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3197
3198 switch (csid) {
3199 case MACSEC_DEFAULT_CIPHER_ID:
3200 case MACSEC_DEFAULT_CIPHER_ALT:
3201 if (icv_len < MACSEC_MIN_ICV_LEN ||
3202 icv_len > MACSEC_MAX_ICV_LEN)
3203 return -EINVAL;
3204 break;
3205 default:
3206 return -EINVAL;
3207 }
3208
3209 if (data[IFLA_MACSEC_ENCODING_SA]) {
3210 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3211 return -EINVAL;
3212 }
3213
3214 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3215 flag < IFLA_MACSEC_VALIDATION;
3216 flag++) {
3217 if (data[flag]) {
3218 if (nla_get_u8(data[flag]) > 1)
3219 return -EINVAL;
3220 }
3221 }
3222
3223 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3224 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3225 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3226
3227 if ((sci && (scb || es)) || (scb && es))
3228 return -EINVAL;
3229
3230 if (data[IFLA_MACSEC_VALIDATION] &&
3231 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3232 return -EINVAL;
3233
3234 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3235 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3236 !data[IFLA_MACSEC_WINDOW])
3237 return -EINVAL;
3238
3239 return 0;
3240 }
3241
3242 static struct net *macsec_get_link_net(const struct net_device *dev)
3243 {
3244 return dev_net(macsec_priv(dev)->real_dev);
3245 }
3246
3247 static size_t macsec_get_size(const struct net_device *dev)
3248 {
3249 return 0 +
3250 nla_total_size_64bit(8) + /* SCI */
3251 nla_total_size(1) + /* ICV_LEN */
3252 nla_total_size_64bit(8) + /* CIPHER_SUITE */
3253 nla_total_size(4) + /* WINDOW */
3254 nla_total_size(1) + /* ENCODING_SA */
3255 nla_total_size(1) + /* ENCRYPT */
3256 nla_total_size(1) + /* PROTECT */
3257 nla_total_size(1) + /* INC_SCI */
3258 nla_total_size(1) + /* ES */
3259 nla_total_size(1) + /* SCB */
3260 nla_total_size(1) + /* REPLAY_PROTECT */
3261 nla_total_size(1) + /* VALIDATION */
3262 0;
3263 }
3264
3265 static int macsec_fill_info(struct sk_buff *skb,
3266 const struct net_device *dev)
3267 {
3268 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3269 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3270
3271 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
3272 IFLA_MACSEC_PAD) ||
3273 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3274 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
3275 MACSEC_DEFAULT_CIPHER_ID, IFLA_MACSEC_PAD) ||
3276 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3277 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3278 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3279 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3280 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3281 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3282 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3283 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3284 0)
3285 goto nla_put_failure;
3286
3287 if (secy->replay_protect) {
3288 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3289 goto nla_put_failure;
3290 }
3291
3292 return 0;
3293
3294 nla_put_failure:
3295 return -EMSGSIZE;
3296 }
3297
3298 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3299 .kind = "macsec",
3300 .priv_size = sizeof(struct macsec_dev),
3301 .maxtype = IFLA_MACSEC_MAX,
3302 .policy = macsec_rtnl_policy,
3303 .setup = macsec_setup,
3304 .validate = macsec_validate_attr,
3305 .newlink = macsec_newlink,
3306 .changelink = macsec_changelink,
3307 .dellink = macsec_dellink,
3308 .get_size = macsec_get_size,
3309 .fill_info = macsec_fill_info,
3310 .get_link_net = macsec_get_link_net,
3311 };
3312
3313 static bool is_macsec_master(struct net_device *dev)
3314 {
3315 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3316 }
3317
3318 static int macsec_notify(struct notifier_block *this, unsigned long event,
3319 void *ptr)
3320 {
3321 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3322 LIST_HEAD(head);
3323
3324 if (!is_macsec_master(real_dev))
3325 return NOTIFY_DONE;
3326
3327 switch (event) {
3328 case NETDEV_UNREGISTER: {
3329 struct macsec_dev *m, *n;
3330 struct macsec_rxh_data *rxd;
3331
3332 rxd = macsec_data_rtnl(real_dev);
3333 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3334 macsec_dellink(m->secy.netdev, &head);
3335 }
3336 unregister_netdevice_many(&head);
3337 break;
3338 }
3339 case NETDEV_CHANGEMTU: {
3340 struct macsec_dev *m;
3341 struct macsec_rxh_data *rxd;
3342
3343 rxd = macsec_data_rtnl(real_dev);
3344 list_for_each_entry(m, &rxd->secys, secys) {
3345 struct net_device *dev = m->secy.netdev;
3346 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3347 macsec_extra_len(true));
3348
3349 if (dev->mtu > mtu)
3350 dev_set_mtu(dev, mtu);
3351 }
3352 }
3353 }
3354
3355 return NOTIFY_OK;
3356 }
3357
3358 static struct notifier_block macsec_notifier = {
3359 .notifier_call = macsec_notify,
3360 };
3361
3362 static int __init macsec_init(void)
3363 {
3364 int err;
3365
3366 pr_info("MACsec IEEE 802.1AE\n");
3367 err = register_netdevice_notifier(&macsec_notifier);
3368 if (err)
3369 return err;
3370
3371 err = rtnl_link_register(&macsec_link_ops);
3372 if (err)
3373 goto notifier;
3374
3375 err = genl_register_family_with_ops(&macsec_fam, macsec_genl_ops);
3376 if (err)
3377 goto rtnl;
3378
3379 return 0;
3380
3381 rtnl:
3382 rtnl_link_unregister(&macsec_link_ops);
3383 notifier:
3384 unregister_netdevice_notifier(&macsec_notifier);
3385 return err;
3386 }
3387
3388 static void __exit macsec_exit(void)
3389 {
3390 genl_unregister_family(&macsec_fam);
3391 rtnl_link_unregister(&macsec_link_ops);
3392 unregister_netdevice_notifier(&macsec_notifier);
3393 rcu_barrier();
3394 }
3395
3396 module_init(macsec_init);
3397 module_exit(macsec_exit);
3398
3399 MODULE_ALIAS_RTNL_LINK("macsec");
3400
3401 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3402 MODULE_LICENSE("GPL v2");
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