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Linux 4.16.11
[linux/fpc-iii.git] / drivers / net / macsec.c
blob7de88b33d5b96d7f18a5f7c242a54c935b587086
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 <linux/refcount.h>
20 #include <net/genetlink.h>
21 #include <net/sock.h>
22 #include <net/gro_cells.h>
23
24 #include <uapi/linux/if_macsec.h>
25
26 typedef u64 __bitwise sci_t;
27
28 #define MACSEC_SCI_LEN 8
29
30 /* SecTAG length = macsec_eth_header without the optional SCI */
31 #define MACSEC_TAG_LEN 6
32
33 struct macsec_eth_header {
34 struct ethhdr eth;
35 /* SecTAG */
36 u8 tci_an;
37 #if defined(__LITTLE_ENDIAN_BITFIELD)
38 u8 short_length:6,
39 unused:2;
40 #elif defined(__BIG_ENDIAN_BITFIELD)
41 u8 unused:2,
42 short_length:6;
43 #else
44 #error "Please fix <asm/byteorder.h>"
45 #endif
46 __be32 packet_number;
47 u8 secure_channel_id[8]; /* optional */
48 } __packed;
49
50 #define MACSEC_TCI_VERSION 0x80
51 #define MACSEC_TCI_ES 0x40 /* end station */
52 #define MACSEC_TCI_SC 0x20 /* SCI present */
53 #define MACSEC_TCI_SCB 0x10 /* epon */
54 #define MACSEC_TCI_E 0x08 /* encryption */
55 #define MACSEC_TCI_C 0x04 /* changed text */
56 #define MACSEC_AN_MASK 0x03 /* association number */
57 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
58
59 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
60 #define MIN_NON_SHORT_LEN 48
61
62 #define GCM_AES_IV_LEN 12
63 #define DEFAULT_ICV_LEN 16
64
65 #define MACSEC_NUM_AN 4 /* 2 bits for the association number */
66
67 #define for_each_rxsc(secy, sc) \
68 for (sc = rcu_dereference_bh(secy->rx_sc); \
69 sc; \
70 sc = rcu_dereference_bh(sc->next))
71 #define for_each_rxsc_rtnl(secy, sc) \
72 for (sc = rtnl_dereference(secy->rx_sc); \
73 sc; \
74 sc = rtnl_dereference(sc->next))
75
76 struct gcm_iv {
77 union {
78 u8 secure_channel_id[8];
79 sci_t sci;
80 };
81 __be32 pn;
82 };
83
84 /**
85 * struct macsec_key - SA key
86 * @id: user-provided key identifier
87 * @tfm: crypto struct, key storage
88 */
89 struct macsec_key {
90 u8 id[MACSEC_KEYID_LEN];
91 struct crypto_aead *tfm;
92 };
93
94 struct macsec_rx_sc_stats {
95 __u64 InOctetsValidated;
96 __u64 InOctetsDecrypted;
97 __u64 InPktsUnchecked;
98 __u64 InPktsDelayed;
99 __u64 InPktsOK;
100 __u64 InPktsInvalid;
101 __u64 InPktsLate;
102 __u64 InPktsNotValid;
103 __u64 InPktsNotUsingSA;
104 __u64 InPktsUnusedSA;
105 };
106
107 struct macsec_rx_sa_stats {
108 __u32 InPktsOK;
109 __u32 InPktsInvalid;
110 __u32 InPktsNotValid;
111 __u32 InPktsNotUsingSA;
112 __u32 InPktsUnusedSA;
113 };
114
115 struct macsec_tx_sa_stats {
116 __u32 OutPktsProtected;
117 __u32 OutPktsEncrypted;
118 };
119
120 struct macsec_tx_sc_stats {
121 __u64 OutPktsProtected;
122 __u64 OutPktsEncrypted;
123 __u64 OutOctetsProtected;
124 __u64 OutOctetsEncrypted;
125 };
126
127 struct macsec_dev_stats {
128 __u64 OutPktsUntagged;
129 __u64 InPktsUntagged;
130 __u64 OutPktsTooLong;
131 __u64 InPktsNoTag;
132 __u64 InPktsBadTag;
133 __u64 InPktsUnknownSCI;
134 __u64 InPktsNoSCI;
135 __u64 InPktsOverrun;
136 };
137
138 /**
139 * struct macsec_rx_sa - receive secure association
140 * @active:
141 * @next_pn: packet number expected for the next packet
142 * @lock: protects next_pn manipulations
143 * @key: key structure
144 * @stats: per-SA stats
145 */
146 struct macsec_rx_sa {
147 struct macsec_key key;
148 spinlock_t lock;
149 u32 next_pn;
150 refcount_t refcnt;
151 bool active;
152 struct macsec_rx_sa_stats __percpu *stats;
153 struct macsec_rx_sc *sc;
154 struct rcu_head rcu;
155 };
156
157 struct pcpu_rx_sc_stats {
158 struct macsec_rx_sc_stats stats;
159 struct u64_stats_sync syncp;
160 };
161
162 /**
163 * struct macsec_rx_sc - receive secure channel
164 * @sci: secure channel identifier for this SC
165 * @active: channel is active
166 * @sa: array of secure associations
167 * @stats: per-SC stats
168 */
169 struct macsec_rx_sc {
170 struct macsec_rx_sc __rcu *next;
171 sci_t sci;
172 bool active;
173 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN];
174 struct pcpu_rx_sc_stats __percpu *stats;
175 refcount_t refcnt;
176 struct rcu_head rcu_head;
177 };
178
179 /**
180 * struct macsec_tx_sa - transmit secure association
181 * @active:
182 * @next_pn: packet number to use for the next packet
183 * @lock: protects next_pn manipulations
184 * @key: key structure
185 * @stats: per-SA stats
186 */
187 struct macsec_tx_sa {
188 struct macsec_key key;
189 spinlock_t lock;
190 u32 next_pn;
191 refcount_t refcnt;
192 bool active;
193 struct macsec_tx_sa_stats __percpu *stats;
194 struct rcu_head rcu;
195 };
196
197 struct pcpu_tx_sc_stats {
198 struct macsec_tx_sc_stats stats;
199 struct u64_stats_sync syncp;
200 };
201
202 /**
203 * struct macsec_tx_sc - transmit secure channel
204 * @active:
205 * @encoding_sa: association number of the SA currently in use
206 * @encrypt: encrypt packets on transmit, or authenticate only
207 * @send_sci: always include the SCI in the SecTAG
208 * @end_station:
209 * @scb: single copy broadcast flag
210 * @sa: array of secure associations
211 * @stats: stats for this TXSC
212 */
213 struct macsec_tx_sc {
214 bool active;
215 u8 encoding_sa;
216 bool encrypt;
217 bool send_sci;
218 bool end_station;
219 bool scb;
220 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN];
221 struct pcpu_tx_sc_stats __percpu *stats;
222 };
223
224 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
225
226 /**
227 * struct macsec_secy - MACsec Security Entity
228 * @netdev: netdevice for this SecY
229 * @n_rx_sc: number of receive secure channels configured on this SecY
230 * @sci: secure channel identifier used for tx
231 * @key_len: length of keys used by the cipher suite
232 * @icv_len: length of ICV used by the cipher suite
233 * @validate_frames: validation mode
234 * @operational: MAC_Operational flag
235 * @protect_frames: enable protection for this SecY
236 * @replay_protect: enable packet number checks on receive
237 * @replay_window: size of the replay window
238 * @tx_sc: transmit secure channel
239 * @rx_sc: linked list of receive secure channels
240 */
241 struct macsec_secy {
242 struct net_device *netdev;
243 unsigned int n_rx_sc;
244 sci_t sci;
245 u16 key_len;
246 u16 icv_len;
247 enum macsec_validation_type validate_frames;
248 bool operational;
249 bool protect_frames;
250 bool replay_protect;
251 u32 replay_window;
252 struct macsec_tx_sc tx_sc;
253 struct macsec_rx_sc __rcu *rx_sc;
254 };
255
256 struct pcpu_secy_stats {
257 struct macsec_dev_stats stats;
258 struct u64_stats_sync syncp;
259 };
260
261 /**
262 * struct macsec_dev - private data
263 * @secy: SecY config
264 * @real_dev: pointer to underlying netdevice
265 * @stats: MACsec device stats
266 * @secys: linked list of SecY's on the underlying device
267 */
268 struct macsec_dev {
269 struct macsec_secy secy;
270 struct net_device *real_dev;
271 struct pcpu_secy_stats __percpu *stats;
272 struct list_head secys;
273 struct gro_cells gro_cells;
274 unsigned int nest_level;
275 };
276
277 /**
278 * struct macsec_rxh_data - rx_handler private argument
279 * @secys: linked list of SecY's on this underlying device
280 */
281 struct macsec_rxh_data {
282 struct list_head secys;
283 };
284
285 static struct macsec_dev *macsec_priv(const struct net_device *dev)
286 {
287 return (struct macsec_dev *)netdev_priv(dev);
288 }
289
290 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
291 {
292 return rcu_dereference_bh(dev->rx_handler_data);
293 }
294
295 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
296 {
297 return rtnl_dereference(dev->rx_handler_data);
298 }
299
300 struct macsec_cb {
301 struct aead_request *req;
302 union {
303 struct macsec_tx_sa *tx_sa;
304 struct macsec_rx_sa *rx_sa;
305 };
306 u8 assoc_num;
307 bool valid;
308 bool has_sci;
309 };
310
311 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
312 {
313 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
314
315 if (!sa || !sa->active)
316 return NULL;
317
318 if (!refcount_inc_not_zero(&sa->refcnt))
319 return NULL;
320
321 return sa;
322 }
323
324 static void free_rx_sc_rcu(struct rcu_head *head)
325 {
326 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
327
328 free_percpu(rx_sc->stats);
329 kfree(rx_sc);
330 }
331
332 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
333 {
334 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
335 }
336
337 static void macsec_rxsc_put(struct macsec_rx_sc *sc)
338 {
339 if (refcount_dec_and_test(&sc->refcnt))
340 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
341 }
342
343 static void free_rxsa(struct rcu_head *head)
344 {
345 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
346
347 crypto_free_aead(sa->key.tfm);
348 free_percpu(sa->stats);
349 kfree(sa);
350 }
351
352 static void macsec_rxsa_put(struct macsec_rx_sa *sa)
353 {
354 if (refcount_dec_and_test(&sa->refcnt))
355 call_rcu(&sa->rcu, free_rxsa);
356 }
357
358 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
359 {
360 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
361
362 if (!sa || !sa->active)
363 return NULL;
364
365 if (!refcount_inc_not_zero(&sa->refcnt))
366 return NULL;
367
368 return sa;
369 }
370
371 static void free_txsa(struct rcu_head *head)
372 {
373 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
374
375 crypto_free_aead(sa->key.tfm);
376 free_percpu(sa->stats);
377 kfree(sa);
378 }
379
380 static void macsec_txsa_put(struct macsec_tx_sa *sa)
381 {
382 if (refcount_dec_and_test(&sa->refcnt))
383 call_rcu(&sa->rcu, free_txsa);
384 }
385
386 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
387 {
388 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
389 return (struct macsec_cb *)skb->cb;
390 }
391
392 #define MACSEC_PORT_ES (htons(0x0001))
393 #define MACSEC_PORT_SCB (0x0000)
394 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
395
396 #define MACSEC_GCM_AES_128_SAK_LEN 16
397 #define MACSEC_GCM_AES_256_SAK_LEN 32
398
399 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
400 #define DEFAULT_SEND_SCI true
401 #define DEFAULT_ENCRYPT false
402 #define DEFAULT_ENCODING_SA 0
403
404 static bool send_sci(const struct macsec_secy *secy)
405 {
406 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
407
408 return tx_sc->send_sci ||
409 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
410 }
411
412 static sci_t make_sci(u8 *addr, __be16 port)
413 {
414 sci_t sci;
415
416 memcpy(&sci, addr, ETH_ALEN);
417 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
418
419 return sci;
420 }
421
422 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
423 {
424 sci_t sci;
425
426 if (sci_present)
427 memcpy(&sci, hdr->secure_channel_id,
428 sizeof(hdr->secure_channel_id));
429 else
430 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
431
432 return sci;
433 }
434
435 static unsigned int macsec_sectag_len(bool sci_present)
436 {
437 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
438 }
439
440 static unsigned int macsec_hdr_len(bool sci_present)
441 {
442 return macsec_sectag_len(sci_present) + ETH_HLEN;
443 }
444
445 static unsigned int macsec_extra_len(bool sci_present)
446 {
447 return macsec_sectag_len(sci_present) + sizeof(__be16);
448 }
449
450 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
451 static void macsec_fill_sectag(struct macsec_eth_header *h,
452 const struct macsec_secy *secy, u32 pn,
453 bool sci_present)
454 {
455 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
456
457 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
458 h->eth.h_proto = htons(ETH_P_MACSEC);
459
460 if (sci_present) {
461 h->tci_an |= MACSEC_TCI_SC;
462 memcpy(&h->secure_channel_id, &secy->sci,
463 sizeof(h->secure_channel_id));
464 } else {
465 if (tx_sc->end_station)
466 h->tci_an |= MACSEC_TCI_ES;
467 if (tx_sc->scb)
468 h->tci_an |= MACSEC_TCI_SCB;
469 }
470
471 h->packet_number = htonl(pn);
472
473 /* with GCM, C/E clear for !encrypt, both set for encrypt */
474 if (tx_sc->encrypt)
475 h->tci_an |= MACSEC_TCI_CONFID;
476 else if (secy->icv_len != DEFAULT_ICV_LEN)
477 h->tci_an |= MACSEC_TCI_C;
478
479 h->tci_an |= tx_sc->encoding_sa;
480 }
481
482 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
483 {
484 if (data_len < MIN_NON_SHORT_LEN)
485 h->short_length = data_len;
486 }
487
488 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
489 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
490 {
491 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
492 int len = skb->len - 2 * ETH_ALEN;
493 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
494
495 /* a) It comprises at least 17 octets */
496 if (skb->len <= 16)
497 return false;
498
499 /* b) MACsec EtherType: already checked */
500
501 /* c) V bit is clear */
502 if (h->tci_an & MACSEC_TCI_VERSION)
503 return false;
504
505 /* d) ES or SCB => !SC */
506 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
507 (h->tci_an & MACSEC_TCI_SC))
508 return false;
509
510 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
511 if (h->unused)
512 return false;
513
514 /* rx.pn != 0 (figure 10-5) */
515 if (!h->packet_number)
516 return false;
517
518 /* length check, f) g) h) i) */
519 if (h->short_length)
520 return len == extra_len + h->short_length;
521 return len >= extra_len + MIN_NON_SHORT_LEN;
522 }
523
524 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
525 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
526
527 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
528 {
529 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
530
531 gcm_iv->sci = sci;
532 gcm_iv->pn = htonl(pn);
533 }
534
535 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
536 {
537 return (struct macsec_eth_header *)skb_mac_header(skb);
538 }
539
540 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
541 {
542 u32 pn;
543
544 spin_lock_bh(&tx_sa->lock);
545 pn = tx_sa->next_pn;
546
547 tx_sa->next_pn++;
548 if (tx_sa->next_pn == 0) {
549 pr_debug("PN wrapped, transitioning to !oper\n");
550 tx_sa->active = false;
551 if (secy->protect_frames)
552 secy->operational = false;
553 }
554 spin_unlock_bh(&tx_sa->lock);
555
556 return pn;
557 }
558
559 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
560 {
561 struct macsec_dev *macsec = netdev_priv(dev);
562
563 skb->dev = macsec->real_dev;
564 skb_reset_mac_header(skb);
565 skb->protocol = eth_hdr(skb)->h_proto;
566 }
567
568 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
569 struct macsec_tx_sa *tx_sa)
570 {
571 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
572
573 u64_stats_update_begin(&txsc_stats->syncp);
574 if (tx_sc->encrypt) {
575 txsc_stats->stats.OutOctetsEncrypted += skb->len;
576 txsc_stats->stats.OutPktsEncrypted++;
577 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
578 } else {
579 txsc_stats->stats.OutOctetsProtected += skb->len;
580 txsc_stats->stats.OutPktsProtected++;
581 this_cpu_inc(tx_sa->stats->OutPktsProtected);
582 }
583 u64_stats_update_end(&txsc_stats->syncp);
584 }
585
586 static void count_tx(struct net_device *dev, int ret, int len)
587 {
588 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
589 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
590
591 u64_stats_update_begin(&stats->syncp);
592 stats->tx_packets++;
593 stats->tx_bytes += len;
594 u64_stats_update_end(&stats->syncp);
595 }
596 }
597
598 static void macsec_encrypt_done(struct crypto_async_request *base, int err)
599 {
600 struct sk_buff *skb = base->data;
601 struct net_device *dev = skb->dev;
602 struct macsec_dev *macsec = macsec_priv(dev);
603 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
604 int len, ret;
605
606 aead_request_free(macsec_skb_cb(skb)->req);
607
608 rcu_read_lock_bh();
609 macsec_encrypt_finish(skb, dev);
610 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
611 len = skb->len;
612 ret = dev_queue_xmit(skb);
613 count_tx(dev, ret, len);
614 rcu_read_unlock_bh();
615
616 macsec_txsa_put(sa);
617 dev_put(dev);
618 }
619
620 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
621 unsigned char **iv,
622 struct scatterlist **sg,
623 int num_frags)
624 {
625 size_t size, iv_offset, sg_offset;
626 struct aead_request *req;
627 void *tmp;
628
629 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
630 iv_offset = size;
631 size += GCM_AES_IV_LEN;
632
633 size = ALIGN(size, __alignof__(struct scatterlist));
634 sg_offset = size;
635 size += sizeof(struct scatterlist) * num_frags;
636
637 tmp = kmalloc(size, GFP_ATOMIC);
638 if (!tmp)
639 return NULL;
640
641 *iv = (unsigned char *)(tmp + iv_offset);
642 *sg = (struct scatterlist *)(tmp + sg_offset);
643 req = tmp;
644
645 aead_request_set_tfm(req, tfm);
646
647 return req;
648 }
649
650 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
651 struct net_device *dev)
652 {
653 int ret;
654 struct scatterlist *sg;
655 struct sk_buff *trailer;
656 unsigned char *iv;
657 struct ethhdr *eth;
658 struct macsec_eth_header *hh;
659 size_t unprotected_len;
660 struct aead_request *req;
661 struct macsec_secy *secy;
662 struct macsec_tx_sc *tx_sc;
663 struct macsec_tx_sa *tx_sa;
664 struct macsec_dev *macsec = macsec_priv(dev);
665 bool sci_present;
666 u32 pn;
667
668 secy = &macsec->secy;
669 tx_sc = &secy->tx_sc;
670
671 /* 10.5.1 TX SA assignment */
672 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
673 if (!tx_sa) {
674 secy->operational = false;
675 kfree_skb(skb);
676 return ERR_PTR(-EINVAL);
677 }
678
679 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
680 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
681 struct sk_buff *nskb = skb_copy_expand(skb,
682 MACSEC_NEEDED_HEADROOM,
683 MACSEC_NEEDED_TAILROOM,
684 GFP_ATOMIC);
685 if (likely(nskb)) {
686 consume_skb(skb);
687 skb = nskb;
688 } else {
689 macsec_txsa_put(tx_sa);
690 kfree_skb(skb);
691 return ERR_PTR(-ENOMEM);
692 }
693 } else {
694 skb = skb_unshare(skb, GFP_ATOMIC);
695 if (!skb) {
696 macsec_txsa_put(tx_sa);
697 return ERR_PTR(-ENOMEM);
698 }
699 }
700
701 unprotected_len = skb->len;
702 eth = eth_hdr(skb);
703 sci_present = send_sci(secy);
704 hh = skb_push(skb, macsec_extra_len(sci_present));
705 memmove(hh, eth, 2 * ETH_ALEN);
706
707 pn = tx_sa_update_pn(tx_sa, secy);
708 if (pn == 0) {
709 macsec_txsa_put(tx_sa);
710 kfree_skb(skb);
711 return ERR_PTR(-ENOLINK);
712 }
713 macsec_fill_sectag(hh, secy, pn, sci_present);
714 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
715
716 skb_put(skb, secy->icv_len);
717
718 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
719 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
720
721 u64_stats_update_begin(&secy_stats->syncp);
722 secy_stats->stats.OutPktsTooLong++;
723 u64_stats_update_end(&secy_stats->syncp);
724
725 macsec_txsa_put(tx_sa);
726 kfree_skb(skb);
727 return ERR_PTR(-EINVAL);
728 }
729
730 ret = skb_cow_data(skb, 0, &trailer);
731 if (unlikely(ret < 0)) {
732 macsec_txsa_put(tx_sa);
733 kfree_skb(skb);
734 return ERR_PTR(ret);
735 }
736
737 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
738 if (!req) {
739 macsec_txsa_put(tx_sa);
740 kfree_skb(skb);
741 return ERR_PTR(-ENOMEM);
742 }
743
744 macsec_fill_iv(iv, secy->sci, pn);
745
746 sg_init_table(sg, ret);
747 ret = skb_to_sgvec(skb, sg, 0, skb->len);
748 if (unlikely(ret < 0)) {
749 aead_request_free(req);
750 macsec_txsa_put(tx_sa);
751 kfree_skb(skb);
752 return ERR_PTR(ret);
753 }
754
755 if (tx_sc->encrypt) {
756 int len = skb->len - macsec_hdr_len(sci_present) -
757 secy->icv_len;
758 aead_request_set_crypt(req, sg, sg, len, iv);
759 aead_request_set_ad(req, macsec_hdr_len(sci_present));
760 } else {
761 aead_request_set_crypt(req, sg, sg, 0, iv);
762 aead_request_set_ad(req, skb->len - secy->icv_len);
763 }
764
765 macsec_skb_cb(skb)->req = req;
766 macsec_skb_cb(skb)->tx_sa = tx_sa;
767 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
768
769 dev_hold(skb->dev);
770 ret = crypto_aead_encrypt(req);
771 if (ret == -EINPROGRESS) {
772 return ERR_PTR(ret);
773 } else if (ret != 0) {
774 dev_put(skb->dev);
775 kfree_skb(skb);
776 aead_request_free(req);
777 macsec_txsa_put(tx_sa);
778 return ERR_PTR(-EINVAL);
779 }
780
781 dev_put(skb->dev);
782 aead_request_free(req);
783 macsec_txsa_put(tx_sa);
784
785 return skb;
786 }
787
788 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
789 {
790 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
791 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
792 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
793 u32 lowest_pn = 0;
794
795 spin_lock(&rx_sa->lock);
796 if (rx_sa->next_pn >= secy->replay_window)
797 lowest_pn = rx_sa->next_pn - secy->replay_window;
798
799 /* Now perform replay protection check again
800 * (see IEEE 802.1AE-2006 figure 10-5)
801 */
802 if (secy->replay_protect && pn < lowest_pn) {
803 spin_unlock(&rx_sa->lock);
804 u64_stats_update_begin(&rxsc_stats->syncp);
805 rxsc_stats->stats.InPktsLate++;
806 u64_stats_update_end(&rxsc_stats->syncp);
807 return false;
808 }
809
810 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
811 u64_stats_update_begin(&rxsc_stats->syncp);
812 if (hdr->tci_an & MACSEC_TCI_E)
813 rxsc_stats->stats.InOctetsDecrypted += skb->len;
814 else
815 rxsc_stats->stats.InOctetsValidated += skb->len;
816 u64_stats_update_end(&rxsc_stats->syncp);
817 }
818
819 if (!macsec_skb_cb(skb)->valid) {
820 spin_unlock(&rx_sa->lock);
821
822 /* 10.6.5 */
823 if (hdr->tci_an & MACSEC_TCI_C ||
824 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
825 u64_stats_update_begin(&rxsc_stats->syncp);
826 rxsc_stats->stats.InPktsNotValid++;
827 u64_stats_update_end(&rxsc_stats->syncp);
828 return false;
829 }
830
831 u64_stats_update_begin(&rxsc_stats->syncp);
832 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
833 rxsc_stats->stats.InPktsInvalid++;
834 this_cpu_inc(rx_sa->stats->InPktsInvalid);
835 } else if (pn < lowest_pn) {
836 rxsc_stats->stats.InPktsDelayed++;
837 } else {
838 rxsc_stats->stats.InPktsUnchecked++;
839 }
840 u64_stats_update_end(&rxsc_stats->syncp);
841 } else {
842 u64_stats_update_begin(&rxsc_stats->syncp);
843 if (pn < lowest_pn) {
844 rxsc_stats->stats.InPktsDelayed++;
845 } else {
846 rxsc_stats->stats.InPktsOK++;
847 this_cpu_inc(rx_sa->stats->InPktsOK);
848 }
849 u64_stats_update_end(&rxsc_stats->syncp);
850
851 if (pn >= rx_sa->next_pn)
852 rx_sa->next_pn = pn + 1;
853 spin_unlock(&rx_sa->lock);
854 }
855
856 return true;
857 }
858
859 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
860 {
861 skb->pkt_type = PACKET_HOST;
862 skb->protocol = eth_type_trans(skb, dev);
863
864 skb_reset_network_header(skb);
865 if (!skb_transport_header_was_set(skb))
866 skb_reset_transport_header(skb);
867 skb_reset_mac_len(skb);
868 }
869
870 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
871 {
872 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
873 skb_pull(skb, hdr_len);
874 pskb_trim_unique(skb, skb->len - icv_len);
875 }
876
877 static void count_rx(struct net_device *dev, int len)
878 {
879 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
880
881 u64_stats_update_begin(&stats->syncp);
882 stats->rx_packets++;
883 stats->rx_bytes += len;
884 u64_stats_update_end(&stats->syncp);
885 }
886
887 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
888 {
889 struct sk_buff *skb = base->data;
890 struct net_device *dev = skb->dev;
891 struct macsec_dev *macsec = macsec_priv(dev);
892 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
893 struct macsec_rx_sc *rx_sc = rx_sa->sc;
894 int len;
895 u32 pn;
896
897 aead_request_free(macsec_skb_cb(skb)->req);
898
899 if (!err)
900 macsec_skb_cb(skb)->valid = true;
901
902 rcu_read_lock_bh();
903 pn = ntohl(macsec_ethhdr(skb)->packet_number);
904 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
905 rcu_read_unlock_bh();
906 kfree_skb(skb);
907 goto out;
908 }
909
910 macsec_finalize_skb(skb, macsec->secy.icv_len,
911 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
912 macsec_reset_skb(skb, macsec->secy.netdev);
913
914 len = skb->len;
915 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
916 count_rx(dev, len);
917
918 rcu_read_unlock_bh();
919
920 out:
921 macsec_rxsa_put(rx_sa);
922 macsec_rxsc_put(rx_sc);
923 dev_put(dev);
924 }
925
926 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
927 struct net_device *dev,
928 struct macsec_rx_sa *rx_sa,
929 sci_t sci,
930 struct macsec_secy *secy)
931 {
932 int ret;
933 struct scatterlist *sg;
934 struct sk_buff *trailer;
935 unsigned char *iv;
936 struct aead_request *req;
937 struct macsec_eth_header *hdr;
938 u16 icv_len = secy->icv_len;
939
940 macsec_skb_cb(skb)->valid = false;
941 skb = skb_share_check(skb, GFP_ATOMIC);
942 if (!skb)
943 return ERR_PTR(-ENOMEM);
944
945 ret = skb_cow_data(skb, 0, &trailer);
946 if (unlikely(ret < 0)) {
947 kfree_skb(skb);
948 return ERR_PTR(ret);
949 }
950 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
951 if (!req) {
952 kfree_skb(skb);
953 return ERR_PTR(-ENOMEM);
954 }
955
956 hdr = (struct macsec_eth_header *)skb->data;
957 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
958
959 sg_init_table(sg, ret);
960 ret = skb_to_sgvec(skb, sg, 0, skb->len);
961 if (unlikely(ret < 0)) {
962 aead_request_free(req);
963 kfree_skb(skb);
964 return ERR_PTR(ret);
965 }
966
967 if (hdr->tci_an & MACSEC_TCI_E) {
968 /* confidentiality: ethernet + macsec header
969 * authenticated, encrypted payload
970 */
971 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
972
973 aead_request_set_crypt(req, sg, sg, len, iv);
974 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
975 skb = skb_unshare(skb, GFP_ATOMIC);
976 if (!skb) {
977 aead_request_free(req);
978 return ERR_PTR(-ENOMEM);
979 }
980 } else {
981 /* integrity only: all headers + data authenticated */
982 aead_request_set_crypt(req, sg, sg, icv_len, iv);
983 aead_request_set_ad(req, skb->len - icv_len);
984 }
985
986 macsec_skb_cb(skb)->req = req;
987 skb->dev = dev;
988 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
989
990 dev_hold(dev);
991 ret = crypto_aead_decrypt(req);
992 if (ret == -EINPROGRESS) {
993 return ERR_PTR(ret);
994 } else if (ret != 0) {
995 /* decryption/authentication failed
996 * 10.6 if validateFrames is disabled, deliver anyway
997 */
998 if (ret != -EBADMSG) {
999 kfree_skb(skb);
1000 skb = ERR_PTR(ret);
1001 }
1002 } else {
1003 macsec_skb_cb(skb)->valid = true;
1004 }
1005 dev_put(dev);
1006
1007 aead_request_free(req);
1008
1009 return skb;
1010 }
1011
1012 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
1013 {
1014 struct macsec_rx_sc *rx_sc;
1015
1016 for_each_rxsc(secy, rx_sc) {
1017 if (rx_sc->sci == sci)
1018 return rx_sc;
1019 }
1020
1021 return NULL;
1022 }
1023
1024 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
1025 {
1026 struct macsec_rx_sc *rx_sc;
1027
1028 for_each_rxsc_rtnl(secy, rx_sc) {
1029 if (rx_sc->sci == sci)
1030 return rx_sc;
1031 }
1032
1033 return NULL;
1034 }
1035
1036 static void handle_not_macsec(struct sk_buff *skb)
1037 {
1038 struct macsec_rxh_data *rxd;
1039 struct macsec_dev *macsec;
1040
1041 rcu_read_lock();
1042 rxd = macsec_data_rcu(skb->dev);
1043
1044 /* 10.6 If the management control validateFrames is not
1045 * Strict, frames without a SecTAG are received, counted, and
1046 * delivered to the Controlled Port
1047 */
1048 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1049 struct sk_buff *nskb;
1050 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1051
1052 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1053 u64_stats_update_begin(&secy_stats->syncp);
1054 secy_stats->stats.InPktsNoTag++;
1055 u64_stats_update_end(&secy_stats->syncp);
1056 continue;
1057 }
1058
1059 /* deliver on this port */
1060 nskb = skb_clone(skb, GFP_ATOMIC);
1061 if (!nskb)
1062 break;
1063
1064 nskb->dev = macsec->secy.netdev;
1065
1066 if (netif_rx(nskb) == NET_RX_SUCCESS) {
1067 u64_stats_update_begin(&secy_stats->syncp);
1068 secy_stats->stats.InPktsUntagged++;
1069 u64_stats_update_end(&secy_stats->syncp);
1070 }
1071 }
1072
1073 rcu_read_unlock();
1074 }
1075
1076 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1077 {
1078 struct sk_buff *skb = *pskb;
1079 struct net_device *dev = skb->dev;
1080 struct macsec_eth_header *hdr;
1081 struct macsec_secy *secy = NULL;
1082 struct macsec_rx_sc *rx_sc;
1083 struct macsec_rx_sa *rx_sa;
1084 struct macsec_rxh_data *rxd;
1085 struct macsec_dev *macsec;
1086 sci_t sci;
1087 u32 pn;
1088 bool cbit;
1089 struct pcpu_rx_sc_stats *rxsc_stats;
1090 struct pcpu_secy_stats *secy_stats;
1091 bool pulled_sci;
1092 int ret;
1093
1094 if (skb_headroom(skb) < ETH_HLEN)
1095 goto drop_direct;
1096
1097 hdr = macsec_ethhdr(skb);
1098 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1099 handle_not_macsec(skb);
1100
1101 /* and deliver to the uncontrolled port */
1102 return RX_HANDLER_PASS;
1103 }
1104
1105 skb = skb_unshare(skb, GFP_ATOMIC);
1106 if (!skb) {
1107 *pskb = NULL;
1108 return RX_HANDLER_CONSUMED;
1109 }
1110
1111 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1112 if (!pulled_sci) {
1113 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1114 goto drop_direct;
1115 }
1116
1117 hdr = macsec_ethhdr(skb);
1118
1119 /* Frames with a SecTAG that has the TCI E bit set but the C
1120 * bit clear are discarded, as this reserved encoding is used
1121 * to identify frames with a SecTAG that are not to be
1122 * delivered to the Controlled Port.
1123 */
1124 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1125 return RX_HANDLER_PASS;
1126
1127 /* now, pull the extra length */
1128 if (hdr->tci_an & MACSEC_TCI_SC) {
1129 if (!pulled_sci)
1130 goto drop_direct;
1131 }
1132
1133 /* ethernet header is part of crypto processing */
1134 skb_push(skb, ETH_HLEN);
1135
1136 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1137 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1138 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1139
1140 rcu_read_lock();
1141 rxd = macsec_data_rcu(skb->dev);
1142
1143 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1144 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1145 sc = sc ? macsec_rxsc_get(sc) : NULL;
1146
1147 if (sc) {
1148 secy = &macsec->secy;
1149 rx_sc = sc;
1150 break;
1151 }
1152 }
1153
1154 if (!secy)
1155 goto nosci;
1156
1157 dev = secy->netdev;
1158 macsec = macsec_priv(dev);
1159 secy_stats = this_cpu_ptr(macsec->stats);
1160 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1161
1162 if (!macsec_validate_skb(skb, secy->icv_len)) {
1163 u64_stats_update_begin(&secy_stats->syncp);
1164 secy_stats->stats.InPktsBadTag++;
1165 u64_stats_update_end(&secy_stats->syncp);
1166 goto drop_nosa;
1167 }
1168
1169 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1170 if (!rx_sa) {
1171 /* 10.6.1 if the SA is not in use */
1172
1173 /* If validateFrames is Strict or the C bit in the
1174 * SecTAG is set, discard
1175 */
1176 if (hdr->tci_an & MACSEC_TCI_C ||
1177 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1178 u64_stats_update_begin(&rxsc_stats->syncp);
1179 rxsc_stats->stats.InPktsNotUsingSA++;
1180 u64_stats_update_end(&rxsc_stats->syncp);
1181 goto drop_nosa;
1182 }
1183
1184 /* not Strict, the frame (with the SecTAG and ICV
1185 * removed) is delivered to the Controlled Port.
1186 */
1187 u64_stats_update_begin(&rxsc_stats->syncp);
1188 rxsc_stats->stats.InPktsUnusedSA++;
1189 u64_stats_update_end(&rxsc_stats->syncp);
1190 goto deliver;
1191 }
1192
1193 /* First, PN check to avoid decrypting obviously wrong packets */
1194 pn = ntohl(hdr->packet_number);
1195 if (secy->replay_protect) {
1196 bool late;
1197
1198 spin_lock(&rx_sa->lock);
1199 late = rx_sa->next_pn >= secy->replay_window &&
1200 pn < (rx_sa->next_pn - secy->replay_window);
1201 spin_unlock(&rx_sa->lock);
1202
1203 if (late) {
1204 u64_stats_update_begin(&rxsc_stats->syncp);
1205 rxsc_stats->stats.InPktsLate++;
1206 u64_stats_update_end(&rxsc_stats->syncp);
1207 goto drop;
1208 }
1209 }
1210
1211 macsec_skb_cb(skb)->rx_sa = rx_sa;
1212
1213 /* Disabled && !changed text => skip validation */
1214 if (hdr->tci_an & MACSEC_TCI_C ||
1215 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1216 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1217
1218 if (IS_ERR(skb)) {
1219 /* the decrypt callback needs the reference */
1220 if (PTR_ERR(skb) != -EINPROGRESS) {
1221 macsec_rxsa_put(rx_sa);
1222 macsec_rxsc_put(rx_sc);
1223 }
1224 rcu_read_unlock();
1225 *pskb = NULL;
1226 return RX_HANDLER_CONSUMED;
1227 }
1228
1229 if (!macsec_post_decrypt(skb, secy, pn))
1230 goto drop;
1231
1232 deliver:
1233 macsec_finalize_skb(skb, secy->icv_len,
1234 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1235 macsec_reset_skb(skb, secy->netdev);
1236
1237 if (rx_sa)
1238 macsec_rxsa_put(rx_sa);
1239 macsec_rxsc_put(rx_sc);
1240
1241 ret = gro_cells_receive(&macsec->gro_cells, skb);
1242 if (ret == NET_RX_SUCCESS)
1243 count_rx(dev, skb->len);
1244 else
1245 macsec->secy.netdev->stats.rx_dropped++;
1246
1247 rcu_read_unlock();
1248
1249 *pskb = NULL;
1250 return RX_HANDLER_CONSUMED;
1251
1252 drop:
1253 macsec_rxsa_put(rx_sa);
1254 drop_nosa:
1255 macsec_rxsc_put(rx_sc);
1256 rcu_read_unlock();
1257 drop_direct:
1258 kfree_skb(skb);
1259 *pskb = NULL;
1260 return RX_HANDLER_CONSUMED;
1261
1262 nosci:
1263 /* 10.6.1 if the SC is not found */
1264 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1265 if (!cbit)
1266 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1267 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1268
1269 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1270 struct sk_buff *nskb;
1271
1272 secy_stats = this_cpu_ptr(macsec->stats);
1273
1274 /* If validateFrames is Strict or the C bit in the
1275 * SecTAG is set, discard
1276 */
1277 if (cbit ||
1278 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1279 u64_stats_update_begin(&secy_stats->syncp);
1280 secy_stats->stats.InPktsNoSCI++;
1281 u64_stats_update_end(&secy_stats->syncp);
1282 continue;
1283 }
1284
1285 /* not strict, the frame (with the SecTAG and ICV
1286 * removed) is delivered to the Controlled Port.
1287 */
1288 nskb = skb_clone(skb, GFP_ATOMIC);
1289 if (!nskb)
1290 break;
1291
1292 macsec_reset_skb(nskb, macsec->secy.netdev);
1293
1294 ret = netif_rx(nskb);
1295 if (ret == NET_RX_SUCCESS) {
1296 u64_stats_update_begin(&secy_stats->syncp);
1297 secy_stats->stats.InPktsUnknownSCI++;
1298 u64_stats_update_end(&secy_stats->syncp);
1299 } else {
1300 macsec->secy.netdev->stats.rx_dropped++;
1301 }
1302 }
1303
1304 rcu_read_unlock();
1305 *pskb = skb;
1306 return RX_HANDLER_PASS;
1307 }
1308
1309 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1310 {
1311 struct crypto_aead *tfm;
1312 int ret;
1313
1314 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1315
1316 if (IS_ERR(tfm))
1317 return tfm;
1318
1319 ret = crypto_aead_setkey(tfm, key, key_len);
1320 if (ret < 0)
1321 goto fail;
1322
1323 ret = crypto_aead_setauthsize(tfm, icv_len);
1324 if (ret < 0)
1325 goto fail;
1326
1327 return tfm;
1328 fail:
1329 crypto_free_aead(tfm);
1330 return ERR_PTR(ret);
1331 }
1332
1333 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1334 int icv_len)
1335 {
1336 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1337 if (!rx_sa->stats)
1338 return -ENOMEM;
1339
1340 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1341 if (IS_ERR(rx_sa->key.tfm)) {
1342 free_percpu(rx_sa->stats);
1343 return PTR_ERR(rx_sa->key.tfm);
1344 }
1345
1346 rx_sa->active = false;
1347 rx_sa->next_pn = 1;
1348 refcount_set(&rx_sa->refcnt, 1);
1349 spin_lock_init(&rx_sa->lock);
1350
1351 return 0;
1352 }
1353
1354 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1355 {
1356 rx_sa->active = false;
1357
1358 macsec_rxsa_put(rx_sa);
1359 }
1360
1361 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1362 {
1363 int i;
1364
1365 for (i = 0; i < MACSEC_NUM_AN; i++) {
1366 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1367
1368 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1369 if (sa)
1370 clear_rx_sa(sa);
1371 }
1372
1373 macsec_rxsc_put(rx_sc);
1374 }
1375
1376 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1377 {
1378 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1379
1380 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1381 rx_sc;
1382 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1383 if (rx_sc->sci == sci) {
1384 if (rx_sc->active)
1385 secy->n_rx_sc--;
1386 rcu_assign_pointer(*rx_scp, rx_sc->next);
1387 return rx_sc;
1388 }
1389 }
1390
1391 return NULL;
1392 }
1393
1394 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1395 {
1396 struct macsec_rx_sc *rx_sc;
1397 struct macsec_dev *macsec;
1398 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1399 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1400 struct macsec_secy *secy;
1401
1402 list_for_each_entry(macsec, &rxd->secys, secys) {
1403 if (find_rx_sc_rtnl(&macsec->secy, sci))
1404 return ERR_PTR(-EEXIST);
1405 }
1406
1407 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1408 if (!rx_sc)
1409 return ERR_PTR(-ENOMEM);
1410
1411 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1412 if (!rx_sc->stats) {
1413 kfree(rx_sc);
1414 return ERR_PTR(-ENOMEM);
1415 }
1416
1417 rx_sc->sci = sci;
1418 rx_sc->active = true;
1419 refcount_set(&rx_sc->refcnt, 1);
1420
1421 secy = &macsec_priv(dev)->secy;
1422 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1423 rcu_assign_pointer(secy->rx_sc, rx_sc);
1424
1425 if (rx_sc->active)
1426 secy->n_rx_sc++;
1427
1428 return rx_sc;
1429 }
1430
1431 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1432 int icv_len)
1433 {
1434 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1435 if (!tx_sa->stats)
1436 return -ENOMEM;
1437
1438 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1439 if (IS_ERR(tx_sa->key.tfm)) {
1440 free_percpu(tx_sa->stats);
1441 return PTR_ERR(tx_sa->key.tfm);
1442 }
1443
1444 tx_sa->active = false;
1445 refcount_set(&tx_sa->refcnt, 1);
1446 spin_lock_init(&tx_sa->lock);
1447
1448 return 0;
1449 }
1450
1451 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1452 {
1453 tx_sa->active = false;
1454
1455 macsec_txsa_put(tx_sa);
1456 }
1457
1458 static struct genl_family macsec_fam;
1459
1460 static struct net_device *get_dev_from_nl(struct net *net,
1461 struct nlattr **attrs)
1462 {
1463 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1464 struct net_device *dev;
1465
1466 dev = __dev_get_by_index(net, ifindex);
1467 if (!dev)
1468 return ERR_PTR(-ENODEV);
1469
1470 if (!netif_is_macsec(dev))
1471 return ERR_PTR(-ENODEV);
1472
1473 return dev;
1474 }
1475
1476 static sci_t nla_get_sci(const struct nlattr *nla)
1477 {
1478 return (__force sci_t)nla_get_u64(nla);
1479 }
1480
1481 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1482 int padattr)
1483 {
1484 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1485 }
1486
1487 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1488 struct nlattr **attrs,
1489 struct nlattr **tb_sa,
1490 struct net_device **devp,
1491 struct macsec_secy **secyp,
1492 struct macsec_tx_sc **scp,
1493 u8 *assoc_num)
1494 {
1495 struct net_device *dev;
1496 struct macsec_secy *secy;
1497 struct macsec_tx_sc *tx_sc;
1498 struct macsec_tx_sa *tx_sa;
1499
1500 if (!tb_sa[MACSEC_SA_ATTR_AN])
1501 return ERR_PTR(-EINVAL);
1502
1503 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1504
1505 dev = get_dev_from_nl(net, attrs);
1506 if (IS_ERR(dev))
1507 return ERR_CAST(dev);
1508
1509 if (*assoc_num >= MACSEC_NUM_AN)
1510 return ERR_PTR(-EINVAL);
1511
1512 secy = &macsec_priv(dev)->secy;
1513 tx_sc = &secy->tx_sc;
1514
1515 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1516 if (!tx_sa)
1517 return ERR_PTR(-ENODEV);
1518
1519 *devp = dev;
1520 *scp = tx_sc;
1521 *secyp = secy;
1522 return tx_sa;
1523 }
1524
1525 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1526 struct nlattr **attrs,
1527 struct nlattr **tb_rxsc,
1528 struct net_device **devp,
1529 struct macsec_secy **secyp)
1530 {
1531 struct net_device *dev;
1532 struct macsec_secy *secy;
1533 struct macsec_rx_sc *rx_sc;
1534 sci_t sci;
1535
1536 dev = get_dev_from_nl(net, attrs);
1537 if (IS_ERR(dev))
1538 return ERR_CAST(dev);
1539
1540 secy = &macsec_priv(dev)->secy;
1541
1542 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1543 return ERR_PTR(-EINVAL);
1544
1545 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1546 rx_sc = find_rx_sc_rtnl(secy, sci);
1547 if (!rx_sc)
1548 return ERR_PTR(-ENODEV);
1549
1550 *secyp = secy;
1551 *devp = dev;
1552
1553 return rx_sc;
1554 }
1555
1556 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1557 struct nlattr **attrs,
1558 struct nlattr **tb_rxsc,
1559 struct nlattr **tb_sa,
1560 struct net_device **devp,
1561 struct macsec_secy **secyp,
1562 struct macsec_rx_sc **scp,
1563 u8 *assoc_num)
1564 {
1565 struct macsec_rx_sc *rx_sc;
1566 struct macsec_rx_sa *rx_sa;
1567
1568 if (!tb_sa[MACSEC_SA_ATTR_AN])
1569 return ERR_PTR(-EINVAL);
1570
1571 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1572 if (*assoc_num >= MACSEC_NUM_AN)
1573 return ERR_PTR(-EINVAL);
1574
1575 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1576 if (IS_ERR(rx_sc))
1577 return ERR_CAST(rx_sc);
1578
1579 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1580 if (!rx_sa)
1581 return ERR_PTR(-ENODEV);
1582
1583 *scp = rx_sc;
1584 return rx_sa;
1585 }
1586
1587
1588 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1589 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1590 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1591 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1592 };
1593
1594 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1595 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1596 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1597 };
1598
1599 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1600 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1601 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1602 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1603 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1604 .len = MACSEC_KEYID_LEN, },
1605 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1606 .len = MACSEC_MAX_KEY_LEN, },
1607 };
1608
1609 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1610 {
1611 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1612 return -EINVAL;
1613
1614 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX,
1615 attrs[MACSEC_ATTR_SA_CONFIG],
1616 macsec_genl_sa_policy, NULL))
1617 return -EINVAL;
1618
1619 return 0;
1620 }
1621
1622 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1623 {
1624 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1625 return -EINVAL;
1626
1627 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX,
1628 attrs[MACSEC_ATTR_RXSC_CONFIG],
1629 macsec_genl_rxsc_policy, NULL))
1630 return -EINVAL;
1631
1632 return 0;
1633 }
1634
1635 static bool validate_add_rxsa(struct nlattr **attrs)
1636 {
1637 if (!attrs[MACSEC_SA_ATTR_AN] ||
1638 !attrs[MACSEC_SA_ATTR_KEY] ||
1639 !attrs[MACSEC_SA_ATTR_KEYID])
1640 return false;
1641
1642 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1643 return false;
1644
1645 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1646 return false;
1647
1648 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1649 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1650 return false;
1651 }
1652
1653 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1654 return false;
1655
1656 return true;
1657 }
1658
1659 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1660 {
1661 struct net_device *dev;
1662 struct nlattr **attrs = info->attrs;
1663 struct macsec_secy *secy;
1664 struct macsec_rx_sc *rx_sc;
1665 struct macsec_rx_sa *rx_sa;
1666 unsigned char assoc_num;
1667 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1668 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1669 int err;
1670
1671 if (!attrs[MACSEC_ATTR_IFINDEX])
1672 return -EINVAL;
1673
1674 if (parse_sa_config(attrs, tb_sa))
1675 return -EINVAL;
1676
1677 if (parse_rxsc_config(attrs, tb_rxsc))
1678 return -EINVAL;
1679
1680 if (!validate_add_rxsa(tb_sa))
1681 return -EINVAL;
1682
1683 rtnl_lock();
1684 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1685 if (IS_ERR(rx_sc)) {
1686 rtnl_unlock();
1687 return PTR_ERR(rx_sc);
1688 }
1689
1690 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1691
1692 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1693 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1694 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1695 rtnl_unlock();
1696 return -EINVAL;
1697 }
1698
1699 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1700 if (rx_sa) {
1701 rtnl_unlock();
1702 return -EBUSY;
1703 }
1704
1705 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1706 if (!rx_sa) {
1707 rtnl_unlock();
1708 return -ENOMEM;
1709 }
1710
1711 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1712 secy->key_len, secy->icv_len);
1713 if (err < 0) {
1714 kfree(rx_sa);
1715 rtnl_unlock();
1716 return err;
1717 }
1718
1719 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1720 spin_lock_bh(&rx_sa->lock);
1721 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1722 spin_unlock_bh(&rx_sa->lock);
1723 }
1724
1725 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1726 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1727
1728 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1729 rx_sa->sc = rx_sc;
1730 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1731
1732 rtnl_unlock();
1733
1734 return 0;
1735 }
1736
1737 static bool validate_add_rxsc(struct nlattr **attrs)
1738 {
1739 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1740 return false;
1741
1742 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1743 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1744 return false;
1745 }
1746
1747 return true;
1748 }
1749
1750 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1751 {
1752 struct net_device *dev;
1753 sci_t sci = MACSEC_UNDEF_SCI;
1754 struct nlattr **attrs = info->attrs;
1755 struct macsec_rx_sc *rx_sc;
1756 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1757
1758 if (!attrs[MACSEC_ATTR_IFINDEX])
1759 return -EINVAL;
1760
1761 if (parse_rxsc_config(attrs, tb_rxsc))
1762 return -EINVAL;
1763
1764 if (!validate_add_rxsc(tb_rxsc))
1765 return -EINVAL;
1766
1767 rtnl_lock();
1768 dev = get_dev_from_nl(genl_info_net(info), attrs);
1769 if (IS_ERR(dev)) {
1770 rtnl_unlock();
1771 return PTR_ERR(dev);
1772 }
1773
1774 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1775
1776 rx_sc = create_rx_sc(dev, sci);
1777 if (IS_ERR(rx_sc)) {
1778 rtnl_unlock();
1779 return PTR_ERR(rx_sc);
1780 }
1781
1782 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1783 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1784
1785 rtnl_unlock();
1786
1787 return 0;
1788 }
1789
1790 static bool validate_add_txsa(struct nlattr **attrs)
1791 {
1792 if (!attrs[MACSEC_SA_ATTR_AN] ||
1793 !attrs[MACSEC_SA_ATTR_PN] ||
1794 !attrs[MACSEC_SA_ATTR_KEY] ||
1795 !attrs[MACSEC_SA_ATTR_KEYID])
1796 return false;
1797
1798 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1799 return false;
1800
1801 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1802 return false;
1803
1804 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1805 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1806 return false;
1807 }
1808
1809 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1810 return false;
1811
1812 return true;
1813 }
1814
1815 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1816 {
1817 struct net_device *dev;
1818 struct nlattr **attrs = info->attrs;
1819 struct macsec_secy *secy;
1820 struct macsec_tx_sc *tx_sc;
1821 struct macsec_tx_sa *tx_sa;
1822 unsigned char assoc_num;
1823 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1824 int err;
1825
1826 if (!attrs[MACSEC_ATTR_IFINDEX])
1827 return -EINVAL;
1828
1829 if (parse_sa_config(attrs, tb_sa))
1830 return -EINVAL;
1831
1832 if (!validate_add_txsa(tb_sa))
1833 return -EINVAL;
1834
1835 rtnl_lock();
1836 dev = get_dev_from_nl(genl_info_net(info), attrs);
1837 if (IS_ERR(dev)) {
1838 rtnl_unlock();
1839 return PTR_ERR(dev);
1840 }
1841
1842 secy = &macsec_priv(dev)->secy;
1843 tx_sc = &secy->tx_sc;
1844
1845 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1846
1847 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1848 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1849 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1850 rtnl_unlock();
1851 return -EINVAL;
1852 }
1853
1854 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1855 if (tx_sa) {
1856 rtnl_unlock();
1857 return -EBUSY;
1858 }
1859
1860 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1861 if (!tx_sa) {
1862 rtnl_unlock();
1863 return -ENOMEM;
1864 }
1865
1866 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1867 secy->key_len, secy->icv_len);
1868 if (err < 0) {
1869 kfree(tx_sa);
1870 rtnl_unlock();
1871 return err;
1872 }
1873
1874 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1875
1876 spin_lock_bh(&tx_sa->lock);
1877 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1878 spin_unlock_bh(&tx_sa->lock);
1879
1880 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1881 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1882
1883 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1884 secy->operational = true;
1885
1886 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1887
1888 rtnl_unlock();
1889
1890 return 0;
1891 }
1892
1893 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1894 {
1895 struct nlattr **attrs = info->attrs;
1896 struct net_device *dev;
1897 struct macsec_secy *secy;
1898 struct macsec_rx_sc *rx_sc;
1899 struct macsec_rx_sa *rx_sa;
1900 u8 assoc_num;
1901 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1902 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1903
1904 if (!attrs[MACSEC_ATTR_IFINDEX])
1905 return -EINVAL;
1906
1907 if (parse_sa_config(attrs, tb_sa))
1908 return -EINVAL;
1909
1910 if (parse_rxsc_config(attrs, tb_rxsc))
1911 return -EINVAL;
1912
1913 rtnl_lock();
1914 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1915 &dev, &secy, &rx_sc, &assoc_num);
1916 if (IS_ERR(rx_sa)) {
1917 rtnl_unlock();
1918 return PTR_ERR(rx_sa);
1919 }
1920
1921 if (rx_sa->active) {
1922 rtnl_unlock();
1923 return -EBUSY;
1924 }
1925
1926 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1927 clear_rx_sa(rx_sa);
1928
1929 rtnl_unlock();
1930
1931 return 0;
1932 }
1933
1934 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1935 {
1936 struct nlattr **attrs = info->attrs;
1937 struct net_device *dev;
1938 struct macsec_secy *secy;
1939 struct macsec_rx_sc *rx_sc;
1940 sci_t sci;
1941 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1942
1943 if (!attrs[MACSEC_ATTR_IFINDEX])
1944 return -EINVAL;
1945
1946 if (parse_rxsc_config(attrs, tb_rxsc))
1947 return -EINVAL;
1948
1949 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1950 return -EINVAL;
1951
1952 rtnl_lock();
1953 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1954 if (IS_ERR(dev)) {
1955 rtnl_unlock();
1956 return PTR_ERR(dev);
1957 }
1958
1959 secy = &macsec_priv(dev)->secy;
1960 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1961
1962 rx_sc = del_rx_sc(secy, sci);
1963 if (!rx_sc) {
1964 rtnl_unlock();
1965 return -ENODEV;
1966 }
1967
1968 free_rx_sc(rx_sc);
1969 rtnl_unlock();
1970
1971 return 0;
1972 }
1973
1974 static int macsec_del_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 rtnl_lock();
1991 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1992 &dev, &secy, &tx_sc, &assoc_num);
1993 if (IS_ERR(tx_sa)) {
1994 rtnl_unlock();
1995 return PTR_ERR(tx_sa);
1996 }
1997
1998 if (tx_sa->active) {
1999 rtnl_unlock();
2000 return -EBUSY;
2001 }
2002
2003 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2004 clear_tx_sa(tx_sa);
2005
2006 rtnl_unlock();
2007
2008 return 0;
2009 }
2010
2011 static bool validate_upd_sa(struct nlattr **attrs)
2012 {
2013 if (!attrs[MACSEC_SA_ATTR_AN] ||
2014 attrs[MACSEC_SA_ATTR_KEY] ||
2015 attrs[MACSEC_SA_ATTR_KEYID])
2016 return false;
2017
2018 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2019 return false;
2020
2021 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
2022 return false;
2023
2024 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2025 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2026 return false;
2027 }
2028
2029 return true;
2030 }
2031
2032 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2033 {
2034 struct nlattr **attrs = info->attrs;
2035 struct net_device *dev;
2036 struct macsec_secy *secy;
2037 struct macsec_tx_sc *tx_sc;
2038 struct macsec_tx_sa *tx_sa;
2039 u8 assoc_num;
2040 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2041
2042 if (!attrs[MACSEC_ATTR_IFINDEX])
2043 return -EINVAL;
2044
2045 if (parse_sa_config(attrs, tb_sa))
2046 return -EINVAL;
2047
2048 if (!validate_upd_sa(tb_sa))
2049 return -EINVAL;
2050
2051 rtnl_lock();
2052 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2053 &dev, &secy, &tx_sc, &assoc_num);
2054 if (IS_ERR(tx_sa)) {
2055 rtnl_unlock();
2056 return PTR_ERR(tx_sa);
2057 }
2058
2059 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2060 spin_lock_bh(&tx_sa->lock);
2061 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2062 spin_unlock_bh(&tx_sa->lock);
2063 }
2064
2065 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2066 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2067
2068 if (assoc_num == tx_sc->encoding_sa)
2069 secy->operational = tx_sa->active;
2070
2071 rtnl_unlock();
2072
2073 return 0;
2074 }
2075
2076 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2077 {
2078 struct nlattr **attrs = info->attrs;
2079 struct net_device *dev;
2080 struct macsec_secy *secy;
2081 struct macsec_rx_sc *rx_sc;
2082 struct macsec_rx_sa *rx_sa;
2083 u8 assoc_num;
2084 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2085 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2086
2087 if (!attrs[MACSEC_ATTR_IFINDEX])
2088 return -EINVAL;
2089
2090 if (parse_rxsc_config(attrs, tb_rxsc))
2091 return -EINVAL;
2092
2093 if (parse_sa_config(attrs, tb_sa))
2094 return -EINVAL;
2095
2096 if (!validate_upd_sa(tb_sa))
2097 return -EINVAL;
2098
2099 rtnl_lock();
2100 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2101 &dev, &secy, &rx_sc, &assoc_num);
2102 if (IS_ERR(rx_sa)) {
2103 rtnl_unlock();
2104 return PTR_ERR(rx_sa);
2105 }
2106
2107 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2108 spin_lock_bh(&rx_sa->lock);
2109 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2110 spin_unlock_bh(&rx_sa->lock);
2111 }
2112
2113 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2114 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2115
2116 rtnl_unlock();
2117 return 0;
2118 }
2119
2120 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2121 {
2122 struct nlattr **attrs = info->attrs;
2123 struct net_device *dev;
2124 struct macsec_secy *secy;
2125 struct macsec_rx_sc *rx_sc;
2126 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2127
2128 if (!attrs[MACSEC_ATTR_IFINDEX])
2129 return -EINVAL;
2130
2131 if (parse_rxsc_config(attrs, tb_rxsc))
2132 return -EINVAL;
2133
2134 if (!validate_add_rxsc(tb_rxsc))
2135 return -EINVAL;
2136
2137 rtnl_lock();
2138 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2139 if (IS_ERR(rx_sc)) {
2140 rtnl_unlock();
2141 return PTR_ERR(rx_sc);
2142 }
2143
2144 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2145 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2146
2147 if (rx_sc->active != new)
2148 secy->n_rx_sc += new ? 1 : -1;
2149
2150 rx_sc->active = new;
2151 }
2152
2153 rtnl_unlock();
2154
2155 return 0;
2156 }
2157
2158 static int copy_tx_sa_stats(struct sk_buff *skb,
2159 struct macsec_tx_sa_stats __percpu *pstats)
2160 {
2161 struct macsec_tx_sa_stats sum = {0, };
2162 int cpu;
2163
2164 for_each_possible_cpu(cpu) {
2165 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2166
2167 sum.OutPktsProtected += stats->OutPktsProtected;
2168 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2169 }
2170
2171 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2172 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2173 return -EMSGSIZE;
2174
2175 return 0;
2176 }
2177
2178 static int copy_rx_sa_stats(struct sk_buff *skb,
2179 struct macsec_rx_sa_stats __percpu *pstats)
2180 {
2181 struct macsec_rx_sa_stats sum = {0, };
2182 int cpu;
2183
2184 for_each_possible_cpu(cpu) {
2185 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2186
2187 sum.InPktsOK += stats->InPktsOK;
2188 sum.InPktsInvalid += stats->InPktsInvalid;
2189 sum.InPktsNotValid += stats->InPktsNotValid;
2190 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2191 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2192 }
2193
2194 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2195 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2196 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2197 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2198 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2199 return -EMSGSIZE;
2200
2201 return 0;
2202 }
2203
2204 static int copy_rx_sc_stats(struct sk_buff *skb,
2205 struct pcpu_rx_sc_stats __percpu *pstats)
2206 {
2207 struct macsec_rx_sc_stats sum = {0, };
2208 int cpu;
2209
2210 for_each_possible_cpu(cpu) {
2211 const struct pcpu_rx_sc_stats *stats;
2212 struct macsec_rx_sc_stats tmp;
2213 unsigned int start;
2214
2215 stats = per_cpu_ptr(pstats, cpu);
2216 do {
2217 start = u64_stats_fetch_begin_irq(&stats->syncp);
2218 memcpy(&tmp, &stats->stats, sizeof(tmp));
2219 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2220
2221 sum.InOctetsValidated += tmp.InOctetsValidated;
2222 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2223 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2224 sum.InPktsDelayed += tmp.InPktsDelayed;
2225 sum.InPktsOK += tmp.InPktsOK;
2226 sum.InPktsInvalid += tmp.InPktsInvalid;
2227 sum.InPktsLate += tmp.InPktsLate;
2228 sum.InPktsNotValid += tmp.InPktsNotValid;
2229 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2230 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2231 }
2232
2233 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2234 sum.InOctetsValidated,
2235 MACSEC_RXSC_STATS_ATTR_PAD) ||
2236 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2237 sum.InOctetsDecrypted,
2238 MACSEC_RXSC_STATS_ATTR_PAD) ||
2239 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2240 sum.InPktsUnchecked,
2241 MACSEC_RXSC_STATS_ATTR_PAD) ||
2242 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2243 sum.InPktsDelayed,
2244 MACSEC_RXSC_STATS_ATTR_PAD) ||
2245 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2246 sum.InPktsOK,
2247 MACSEC_RXSC_STATS_ATTR_PAD) ||
2248 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2249 sum.InPktsInvalid,
2250 MACSEC_RXSC_STATS_ATTR_PAD) ||
2251 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2252 sum.InPktsLate,
2253 MACSEC_RXSC_STATS_ATTR_PAD) ||
2254 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2255 sum.InPktsNotValid,
2256 MACSEC_RXSC_STATS_ATTR_PAD) ||
2257 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2258 sum.InPktsNotUsingSA,
2259 MACSEC_RXSC_STATS_ATTR_PAD) ||
2260 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2261 sum.InPktsUnusedSA,
2262 MACSEC_RXSC_STATS_ATTR_PAD))
2263 return -EMSGSIZE;
2264
2265 return 0;
2266 }
2267
2268 static int copy_tx_sc_stats(struct sk_buff *skb,
2269 struct pcpu_tx_sc_stats __percpu *pstats)
2270 {
2271 struct macsec_tx_sc_stats sum = {0, };
2272 int cpu;
2273
2274 for_each_possible_cpu(cpu) {
2275 const struct pcpu_tx_sc_stats *stats;
2276 struct macsec_tx_sc_stats tmp;
2277 unsigned int start;
2278
2279 stats = per_cpu_ptr(pstats, cpu);
2280 do {
2281 start = u64_stats_fetch_begin_irq(&stats->syncp);
2282 memcpy(&tmp, &stats->stats, sizeof(tmp));
2283 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2284
2285 sum.OutPktsProtected += tmp.OutPktsProtected;
2286 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2287 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2288 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2289 }
2290
2291 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2292 sum.OutPktsProtected,
2293 MACSEC_TXSC_STATS_ATTR_PAD) ||
2294 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2295 sum.OutPktsEncrypted,
2296 MACSEC_TXSC_STATS_ATTR_PAD) ||
2297 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2298 sum.OutOctetsProtected,
2299 MACSEC_TXSC_STATS_ATTR_PAD) ||
2300 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2301 sum.OutOctetsEncrypted,
2302 MACSEC_TXSC_STATS_ATTR_PAD))
2303 return -EMSGSIZE;
2304
2305 return 0;
2306 }
2307
2308 static int copy_secy_stats(struct sk_buff *skb,
2309 struct pcpu_secy_stats __percpu *pstats)
2310 {
2311 struct macsec_dev_stats sum = {0, };
2312 int cpu;
2313
2314 for_each_possible_cpu(cpu) {
2315 const struct pcpu_secy_stats *stats;
2316 struct macsec_dev_stats tmp;
2317 unsigned int start;
2318
2319 stats = per_cpu_ptr(pstats, cpu);
2320 do {
2321 start = u64_stats_fetch_begin_irq(&stats->syncp);
2322 memcpy(&tmp, &stats->stats, sizeof(tmp));
2323 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2324
2325 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2326 sum.InPktsUntagged += tmp.InPktsUntagged;
2327 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2328 sum.InPktsNoTag += tmp.InPktsNoTag;
2329 sum.InPktsBadTag += tmp.InPktsBadTag;
2330 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2331 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2332 sum.InPktsOverrun += tmp.InPktsOverrun;
2333 }
2334
2335 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2336 sum.OutPktsUntagged,
2337 MACSEC_SECY_STATS_ATTR_PAD) ||
2338 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2339 sum.InPktsUntagged,
2340 MACSEC_SECY_STATS_ATTR_PAD) ||
2341 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2342 sum.OutPktsTooLong,
2343 MACSEC_SECY_STATS_ATTR_PAD) ||
2344 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2345 sum.InPktsNoTag,
2346 MACSEC_SECY_STATS_ATTR_PAD) ||
2347 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2348 sum.InPktsBadTag,
2349 MACSEC_SECY_STATS_ATTR_PAD) ||
2350 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2351 sum.InPktsUnknownSCI,
2352 MACSEC_SECY_STATS_ATTR_PAD) ||
2353 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2354 sum.InPktsNoSCI,
2355 MACSEC_SECY_STATS_ATTR_PAD) ||
2356 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2357 sum.InPktsOverrun,
2358 MACSEC_SECY_STATS_ATTR_PAD))
2359 return -EMSGSIZE;
2360
2361 return 0;
2362 }
2363
2364 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2365 {
2366 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2367 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2368 u64 csid;
2369
2370 if (!secy_nest)
2371 return 1;
2372
2373 switch (secy->key_len) {
2374 case MACSEC_GCM_AES_128_SAK_LEN:
2375 csid = MACSEC_DEFAULT_CIPHER_ID;
2376 break;
2377 case MACSEC_GCM_AES_256_SAK_LEN:
2378 csid = MACSEC_CIPHER_ID_GCM_AES_256;
2379 break;
2380 default:
2381 goto cancel;
2382 }
2383
2384 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2385 MACSEC_SECY_ATTR_PAD) ||
2386 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2387 csid, MACSEC_SECY_ATTR_PAD) ||
2388 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2389 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2390 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2391 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2392 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2393 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2394 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2395 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2396 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2397 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2398 goto cancel;
2399
2400 if (secy->replay_protect) {
2401 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2402 goto cancel;
2403 }
2404
2405 nla_nest_end(skb, secy_nest);
2406 return 0;
2407
2408 cancel:
2409 nla_nest_cancel(skb, secy_nest);
2410 return 1;
2411 }
2412
2413 static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2414 struct sk_buff *skb, struct netlink_callback *cb)
2415 {
2416 struct macsec_rx_sc *rx_sc;
2417 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2418 struct nlattr *txsa_list, *rxsc_list;
2419 int i, j;
2420 void *hdr;
2421 struct nlattr *attr;
2422
2423 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2424 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2425 if (!hdr)
2426 return -EMSGSIZE;
2427
2428 genl_dump_check_consistent(cb, hdr);
2429
2430 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2431 goto nla_put_failure;
2432
2433 if (nla_put_secy(secy, skb))
2434 goto nla_put_failure;
2435
2436 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2437 if (!attr)
2438 goto nla_put_failure;
2439 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2440 nla_nest_cancel(skb, attr);
2441 goto nla_put_failure;
2442 }
2443 nla_nest_end(skb, attr);
2444
2445 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2446 if (!attr)
2447 goto nla_put_failure;
2448 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2449 nla_nest_cancel(skb, attr);
2450 goto nla_put_failure;
2451 }
2452 nla_nest_end(skb, attr);
2453
2454 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2455 if (!txsa_list)
2456 goto nla_put_failure;
2457 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2458 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2459 struct nlattr *txsa_nest;
2460
2461 if (!tx_sa)
2462 continue;
2463
2464 txsa_nest = nla_nest_start(skb, j++);
2465 if (!txsa_nest) {
2466 nla_nest_cancel(skb, txsa_list);
2467 goto nla_put_failure;
2468 }
2469
2470 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2471 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2472 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2473 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2474 nla_nest_cancel(skb, txsa_nest);
2475 nla_nest_cancel(skb, txsa_list);
2476 goto nla_put_failure;
2477 }
2478
2479 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2480 if (!attr) {
2481 nla_nest_cancel(skb, txsa_nest);
2482 nla_nest_cancel(skb, txsa_list);
2483 goto nla_put_failure;
2484 }
2485 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2486 nla_nest_cancel(skb, attr);
2487 nla_nest_cancel(skb, txsa_nest);
2488 nla_nest_cancel(skb, txsa_list);
2489 goto nla_put_failure;
2490 }
2491 nla_nest_end(skb, attr);
2492
2493 nla_nest_end(skb, txsa_nest);
2494 }
2495 nla_nest_end(skb, txsa_list);
2496
2497 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2498 if (!rxsc_list)
2499 goto nla_put_failure;
2500
2501 j = 1;
2502 for_each_rxsc_rtnl(secy, rx_sc) {
2503 int k;
2504 struct nlattr *rxsa_list;
2505 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2506
2507 if (!rxsc_nest) {
2508 nla_nest_cancel(skb, rxsc_list);
2509 goto nla_put_failure;
2510 }
2511
2512 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2513 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
2514 MACSEC_RXSC_ATTR_PAD)) {
2515 nla_nest_cancel(skb, rxsc_nest);
2516 nla_nest_cancel(skb, rxsc_list);
2517 goto nla_put_failure;
2518 }
2519
2520 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2521 if (!attr) {
2522 nla_nest_cancel(skb, rxsc_nest);
2523 nla_nest_cancel(skb, rxsc_list);
2524 goto nla_put_failure;
2525 }
2526 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2527 nla_nest_cancel(skb, attr);
2528 nla_nest_cancel(skb, rxsc_nest);
2529 nla_nest_cancel(skb, rxsc_list);
2530 goto nla_put_failure;
2531 }
2532 nla_nest_end(skb, attr);
2533
2534 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2535 if (!rxsa_list) {
2536 nla_nest_cancel(skb, rxsc_nest);
2537 nla_nest_cancel(skb, rxsc_list);
2538 goto nla_put_failure;
2539 }
2540
2541 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2542 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2543 struct nlattr *rxsa_nest;
2544
2545 if (!rx_sa)
2546 continue;
2547
2548 rxsa_nest = nla_nest_start(skb, k++);
2549 if (!rxsa_nest) {
2550 nla_nest_cancel(skb, rxsa_list);
2551 nla_nest_cancel(skb, rxsc_nest);
2552 nla_nest_cancel(skb, rxsc_list);
2553 goto nla_put_failure;
2554 }
2555
2556 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2557 if (!attr) {
2558 nla_nest_cancel(skb, rxsa_list);
2559 nla_nest_cancel(skb, rxsc_nest);
2560 nla_nest_cancel(skb, rxsc_list);
2561 goto nla_put_failure;
2562 }
2563 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2564 nla_nest_cancel(skb, attr);
2565 nla_nest_cancel(skb, rxsa_list);
2566 nla_nest_cancel(skb, rxsc_nest);
2567 nla_nest_cancel(skb, rxsc_list);
2568 goto nla_put_failure;
2569 }
2570 nla_nest_end(skb, attr);
2571
2572 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2573 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2574 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2575 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2576 nla_nest_cancel(skb, rxsa_nest);
2577 nla_nest_cancel(skb, rxsc_nest);
2578 nla_nest_cancel(skb, rxsc_list);
2579 goto nla_put_failure;
2580 }
2581 nla_nest_end(skb, rxsa_nest);
2582 }
2583
2584 nla_nest_end(skb, rxsa_list);
2585 nla_nest_end(skb, rxsc_nest);
2586 }
2587
2588 nla_nest_end(skb, rxsc_list);
2589
2590 genlmsg_end(skb, hdr);
2591
2592 return 0;
2593
2594 nla_put_failure:
2595 genlmsg_cancel(skb, hdr);
2596 return -EMSGSIZE;
2597 }
2598
2599 static int macsec_generation = 1; /* protected by RTNL */
2600
2601 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2602 {
2603 struct net *net = sock_net(skb->sk);
2604 struct net_device *dev;
2605 int dev_idx, d;
2606
2607 dev_idx = cb->args[0];
2608
2609 d = 0;
2610 rtnl_lock();
2611
2612 cb->seq = macsec_generation;
2613
2614 for_each_netdev(net, dev) {
2615 struct macsec_secy *secy;
2616
2617 if (d < dev_idx)
2618 goto next;
2619
2620 if (!netif_is_macsec(dev))
2621 goto next;
2622
2623 secy = &macsec_priv(dev)->secy;
2624 if (dump_secy(secy, dev, skb, cb) < 0)
2625 goto done;
2626 next:
2627 d++;
2628 }
2629
2630 done:
2631 rtnl_unlock();
2632 cb->args[0] = d;
2633 return skb->len;
2634 }
2635
2636 static const struct genl_ops macsec_genl_ops[] = {
2637 {
2638 .cmd = MACSEC_CMD_GET_TXSC,
2639 .dumpit = macsec_dump_txsc,
2640 .policy = macsec_genl_policy,
2641 },
2642 {
2643 .cmd = MACSEC_CMD_ADD_RXSC,
2644 .doit = macsec_add_rxsc,
2645 .policy = macsec_genl_policy,
2646 .flags = GENL_ADMIN_PERM,
2647 },
2648 {
2649 .cmd = MACSEC_CMD_DEL_RXSC,
2650 .doit = macsec_del_rxsc,
2651 .policy = macsec_genl_policy,
2652 .flags = GENL_ADMIN_PERM,
2653 },
2654 {
2655 .cmd = MACSEC_CMD_UPD_RXSC,
2656 .doit = macsec_upd_rxsc,
2657 .policy = macsec_genl_policy,
2658 .flags = GENL_ADMIN_PERM,
2659 },
2660 {
2661 .cmd = MACSEC_CMD_ADD_TXSA,
2662 .doit = macsec_add_txsa,
2663 .policy = macsec_genl_policy,
2664 .flags = GENL_ADMIN_PERM,
2665 },
2666 {
2667 .cmd = MACSEC_CMD_DEL_TXSA,
2668 .doit = macsec_del_txsa,
2669 .policy = macsec_genl_policy,
2670 .flags = GENL_ADMIN_PERM,
2671 },
2672 {
2673 .cmd = MACSEC_CMD_UPD_TXSA,
2674 .doit = macsec_upd_txsa,
2675 .policy = macsec_genl_policy,
2676 .flags = GENL_ADMIN_PERM,
2677 },
2678 {
2679 .cmd = MACSEC_CMD_ADD_RXSA,
2680 .doit = macsec_add_rxsa,
2681 .policy = macsec_genl_policy,
2682 .flags = GENL_ADMIN_PERM,
2683 },
2684 {
2685 .cmd = MACSEC_CMD_DEL_RXSA,
2686 .doit = macsec_del_rxsa,
2687 .policy = macsec_genl_policy,
2688 .flags = GENL_ADMIN_PERM,
2689 },
2690 {
2691 .cmd = MACSEC_CMD_UPD_RXSA,
2692 .doit = macsec_upd_rxsa,
2693 .policy = macsec_genl_policy,
2694 .flags = GENL_ADMIN_PERM,
2695 },
2696 };
2697
2698 static struct genl_family macsec_fam __ro_after_init = {
2699 .name = MACSEC_GENL_NAME,
2700 .hdrsize = 0,
2701 .version = MACSEC_GENL_VERSION,
2702 .maxattr = MACSEC_ATTR_MAX,
2703 .netnsok = true,
2704 .module = THIS_MODULE,
2705 .ops = macsec_genl_ops,
2706 .n_ops = ARRAY_SIZE(macsec_genl_ops),
2707 };
2708
2709 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2710 struct net_device *dev)
2711 {
2712 struct macsec_dev *macsec = netdev_priv(dev);
2713 struct macsec_secy *secy = &macsec->secy;
2714 struct pcpu_secy_stats *secy_stats;
2715 int ret, len;
2716
2717 /* 10.5 */
2718 if (!secy->protect_frames) {
2719 secy_stats = this_cpu_ptr(macsec->stats);
2720 u64_stats_update_begin(&secy_stats->syncp);
2721 secy_stats->stats.OutPktsUntagged++;
2722 u64_stats_update_end(&secy_stats->syncp);
2723 skb->dev = macsec->real_dev;
2724 len = skb->len;
2725 ret = dev_queue_xmit(skb);
2726 count_tx(dev, ret, len);
2727 return ret;
2728 }
2729
2730 if (!secy->operational) {
2731 kfree_skb(skb);
2732 dev->stats.tx_dropped++;
2733 return NETDEV_TX_OK;
2734 }
2735
2736 skb = macsec_encrypt(skb, dev);
2737 if (IS_ERR(skb)) {
2738 if (PTR_ERR(skb) != -EINPROGRESS)
2739 dev->stats.tx_dropped++;
2740 return NETDEV_TX_OK;
2741 }
2742
2743 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2744
2745 macsec_encrypt_finish(skb, dev);
2746 len = skb->len;
2747 ret = dev_queue_xmit(skb);
2748 count_tx(dev, ret, len);
2749 return ret;
2750 }
2751
2752 #define MACSEC_FEATURES \
2753 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2754 static struct lock_class_key macsec_netdev_addr_lock_key;
2755
2756 static int macsec_dev_init(struct net_device *dev)
2757 {
2758 struct macsec_dev *macsec = macsec_priv(dev);
2759 struct net_device *real_dev = macsec->real_dev;
2760 int err;
2761
2762 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2763 if (!dev->tstats)
2764 return -ENOMEM;
2765
2766 err = gro_cells_init(&macsec->gro_cells, dev);
2767 if (err) {
2768 free_percpu(dev->tstats);
2769 return err;
2770 }
2771
2772 dev->features = real_dev->features & MACSEC_FEATURES;
2773 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2774
2775 dev->needed_headroom = real_dev->needed_headroom +
2776 MACSEC_NEEDED_HEADROOM;
2777 dev->needed_tailroom = real_dev->needed_tailroom +
2778 MACSEC_NEEDED_TAILROOM;
2779
2780 if (is_zero_ether_addr(dev->dev_addr))
2781 eth_hw_addr_inherit(dev, real_dev);
2782 if (is_zero_ether_addr(dev->broadcast))
2783 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2784
2785 return 0;
2786 }
2787
2788 static void macsec_dev_uninit(struct net_device *dev)
2789 {
2790 struct macsec_dev *macsec = macsec_priv(dev);
2791
2792 gro_cells_destroy(&macsec->gro_cells);
2793 free_percpu(dev->tstats);
2794 }
2795
2796 static netdev_features_t macsec_fix_features(struct net_device *dev,
2797 netdev_features_t features)
2798 {
2799 struct macsec_dev *macsec = macsec_priv(dev);
2800 struct net_device *real_dev = macsec->real_dev;
2801
2802 features &= (real_dev->features & MACSEC_FEATURES) |
2803 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
2804 features |= NETIF_F_LLTX;
2805
2806 return features;
2807 }
2808
2809 static int macsec_dev_open(struct net_device *dev)
2810 {
2811 struct macsec_dev *macsec = macsec_priv(dev);
2812 struct net_device *real_dev = macsec->real_dev;
2813 int err;
2814
2815 if (!(real_dev->flags & IFF_UP))
2816 return -ENETDOWN;
2817
2818 err = dev_uc_add(real_dev, dev->dev_addr);
2819 if (err < 0)
2820 return err;
2821
2822 if (dev->flags & IFF_ALLMULTI) {
2823 err = dev_set_allmulti(real_dev, 1);
2824 if (err < 0)
2825 goto del_unicast;
2826 }
2827
2828 if (dev->flags & IFF_PROMISC) {
2829 err = dev_set_promiscuity(real_dev, 1);
2830 if (err < 0)
2831 goto clear_allmulti;
2832 }
2833
2834 if (netif_carrier_ok(real_dev))
2835 netif_carrier_on(dev);
2836
2837 return 0;
2838 clear_allmulti:
2839 if (dev->flags & IFF_ALLMULTI)
2840 dev_set_allmulti(real_dev, -1);
2841 del_unicast:
2842 dev_uc_del(real_dev, dev->dev_addr);
2843 netif_carrier_off(dev);
2844 return err;
2845 }
2846
2847 static int macsec_dev_stop(struct net_device *dev)
2848 {
2849 struct macsec_dev *macsec = macsec_priv(dev);
2850 struct net_device *real_dev = macsec->real_dev;
2851
2852 netif_carrier_off(dev);
2853
2854 dev_mc_unsync(real_dev, dev);
2855 dev_uc_unsync(real_dev, dev);
2856
2857 if (dev->flags & IFF_ALLMULTI)
2858 dev_set_allmulti(real_dev, -1);
2859
2860 if (dev->flags & IFF_PROMISC)
2861 dev_set_promiscuity(real_dev, -1);
2862
2863 dev_uc_del(real_dev, dev->dev_addr);
2864
2865 return 0;
2866 }
2867
2868 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2869 {
2870 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2871
2872 if (!(dev->flags & IFF_UP))
2873 return;
2874
2875 if (change & IFF_ALLMULTI)
2876 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2877
2878 if (change & IFF_PROMISC)
2879 dev_set_promiscuity(real_dev,
2880 dev->flags & IFF_PROMISC ? 1 : -1);
2881 }
2882
2883 static void macsec_dev_set_rx_mode(struct net_device *dev)
2884 {
2885 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2886
2887 dev_mc_sync(real_dev, dev);
2888 dev_uc_sync(real_dev, dev);
2889 }
2890
2891 static int macsec_set_mac_address(struct net_device *dev, void *p)
2892 {
2893 struct macsec_dev *macsec = macsec_priv(dev);
2894 struct net_device *real_dev = macsec->real_dev;
2895 struct sockaddr *addr = p;
2896 int err;
2897
2898 if (!is_valid_ether_addr(addr->sa_data))
2899 return -EADDRNOTAVAIL;
2900
2901 if (!(dev->flags & IFF_UP))
2902 goto out;
2903
2904 err = dev_uc_add(real_dev, addr->sa_data);
2905 if (err < 0)
2906 return err;
2907
2908 dev_uc_del(real_dev, dev->dev_addr);
2909
2910 out:
2911 ether_addr_copy(dev->dev_addr, addr->sa_data);
2912 return 0;
2913 }
2914
2915 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2916 {
2917 struct macsec_dev *macsec = macsec_priv(dev);
2918 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2919
2920 if (macsec->real_dev->mtu - extra < new_mtu)
2921 return -ERANGE;
2922
2923 dev->mtu = new_mtu;
2924
2925 return 0;
2926 }
2927
2928 static void macsec_get_stats64(struct net_device *dev,
2929 struct rtnl_link_stats64 *s)
2930 {
2931 int cpu;
2932
2933 if (!dev->tstats)
2934 return;
2935
2936 for_each_possible_cpu(cpu) {
2937 struct pcpu_sw_netstats *stats;
2938 struct pcpu_sw_netstats tmp;
2939 int start;
2940
2941 stats = per_cpu_ptr(dev->tstats, cpu);
2942 do {
2943 start = u64_stats_fetch_begin_irq(&stats->syncp);
2944 tmp.rx_packets = stats->rx_packets;
2945 tmp.rx_bytes = stats->rx_bytes;
2946 tmp.tx_packets = stats->tx_packets;
2947 tmp.tx_bytes = stats->tx_bytes;
2948 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2949
2950 s->rx_packets += tmp.rx_packets;
2951 s->rx_bytes += tmp.rx_bytes;
2952 s->tx_packets += tmp.tx_packets;
2953 s->tx_bytes += tmp.tx_bytes;
2954 }
2955
2956 s->rx_dropped = dev->stats.rx_dropped;
2957 s->tx_dropped = dev->stats.tx_dropped;
2958 }
2959
2960 static int macsec_get_iflink(const struct net_device *dev)
2961 {
2962 return macsec_priv(dev)->real_dev->ifindex;
2963 }
2964
2965
2966 static int macsec_get_nest_level(struct net_device *dev)
2967 {
2968 return macsec_priv(dev)->nest_level;
2969 }
2970
2971
2972 static const struct net_device_ops macsec_netdev_ops = {
2973 .ndo_init = macsec_dev_init,
2974 .ndo_uninit = macsec_dev_uninit,
2975 .ndo_open = macsec_dev_open,
2976 .ndo_stop = macsec_dev_stop,
2977 .ndo_fix_features = macsec_fix_features,
2978 .ndo_change_mtu = macsec_change_mtu,
2979 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2980 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2981 .ndo_set_mac_address = macsec_set_mac_address,
2982 .ndo_start_xmit = macsec_start_xmit,
2983 .ndo_get_stats64 = macsec_get_stats64,
2984 .ndo_get_iflink = macsec_get_iflink,
2985 .ndo_get_lock_subclass = macsec_get_nest_level,
2986 };
2987
2988 static const struct device_type macsec_type = {
2989 .name = "macsec",
2990 };
2991
2992 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2993 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2994 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2995 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2996 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2997 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2998 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2999 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3000 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3001 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3002 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3003 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3004 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3005 };
3006
3007 static void macsec_free_netdev(struct net_device *dev)
3008 {
3009 struct macsec_dev *macsec = macsec_priv(dev);
3010 struct net_device *real_dev = macsec->real_dev;
3011
3012 free_percpu(macsec->stats);
3013 free_percpu(macsec->secy.tx_sc.stats);
3014
3015 dev_put(real_dev);
3016 }
3017
3018 static void macsec_setup(struct net_device *dev)
3019 {
3020 ether_setup(dev);
3021 dev->min_mtu = 0;
3022 dev->max_mtu = ETH_MAX_MTU;
3023 dev->priv_flags |= IFF_NO_QUEUE;
3024 dev->netdev_ops = &macsec_netdev_ops;
3025 dev->needs_free_netdev = true;
3026 dev->priv_destructor = macsec_free_netdev;
3027 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3028
3029 eth_zero_addr(dev->broadcast);
3030 }
3031
3032 static int macsec_changelink_common(struct net_device *dev,
3033 struct nlattr *data[])
3034 {
3035 struct macsec_secy *secy;
3036 struct macsec_tx_sc *tx_sc;
3037
3038 secy = &macsec_priv(dev)->secy;
3039 tx_sc = &secy->tx_sc;
3040
3041 if (data[IFLA_MACSEC_ENCODING_SA]) {
3042 struct macsec_tx_sa *tx_sa;
3043
3044 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3045 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3046
3047 secy->operational = tx_sa && tx_sa->active;
3048 }
3049
3050 if (data[IFLA_MACSEC_WINDOW])
3051 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3052
3053 if (data[IFLA_MACSEC_ENCRYPT])
3054 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3055
3056 if (data[IFLA_MACSEC_PROTECT])
3057 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3058
3059 if (data[IFLA_MACSEC_INC_SCI])
3060 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3061
3062 if (data[IFLA_MACSEC_ES])
3063 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3064
3065 if (data[IFLA_MACSEC_SCB])
3066 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3067
3068 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3069 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3070
3071 if (data[IFLA_MACSEC_VALIDATION])
3072 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3073
3074 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3075 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3076 case MACSEC_CIPHER_ID_GCM_AES_128:
3077 case MACSEC_DEFAULT_CIPHER_ID:
3078 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3079 break;
3080 case MACSEC_CIPHER_ID_GCM_AES_256:
3081 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3082 break;
3083 default:
3084 return -EINVAL;
3085 }
3086 }
3087
3088 return 0;
3089 }
3090
3091 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3092 struct nlattr *data[],
3093 struct netlink_ext_ack *extack)
3094 {
3095 if (!data)
3096 return 0;
3097
3098 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3099 data[IFLA_MACSEC_ICV_LEN] ||
3100 data[IFLA_MACSEC_SCI] ||
3101 data[IFLA_MACSEC_PORT])
3102 return -EINVAL;
3103
3104 return macsec_changelink_common(dev, data);
3105 }
3106
3107 static void macsec_del_dev(struct macsec_dev *macsec)
3108 {
3109 int i;
3110
3111 while (macsec->secy.rx_sc) {
3112 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3113
3114 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3115 free_rx_sc(rx_sc);
3116 }
3117
3118 for (i = 0; i < MACSEC_NUM_AN; i++) {
3119 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3120
3121 if (sa) {
3122 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3123 clear_tx_sa(sa);
3124 }
3125 }
3126 }
3127
3128 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3129 {
3130 struct macsec_dev *macsec = macsec_priv(dev);
3131 struct net_device *real_dev = macsec->real_dev;
3132
3133 unregister_netdevice_queue(dev, head);
3134 list_del_rcu(&macsec->secys);
3135 macsec_del_dev(macsec);
3136 netdev_upper_dev_unlink(real_dev, dev);
3137
3138 macsec_generation++;
3139 }
3140
3141 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3142 {
3143 struct macsec_dev *macsec = macsec_priv(dev);
3144 struct net_device *real_dev = macsec->real_dev;
3145 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3146
3147 macsec_common_dellink(dev, head);
3148
3149 if (list_empty(&rxd->secys)) {
3150 netdev_rx_handler_unregister(real_dev);
3151 kfree(rxd);
3152 }
3153 }
3154
3155 static int register_macsec_dev(struct net_device *real_dev,
3156 struct net_device *dev)
3157 {
3158 struct macsec_dev *macsec = macsec_priv(dev);
3159 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3160
3161 if (!rxd) {
3162 int err;
3163
3164 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3165 if (!rxd)
3166 return -ENOMEM;
3167
3168 INIT_LIST_HEAD(&rxd->secys);
3169
3170 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3171 rxd);
3172 if (err < 0) {
3173 kfree(rxd);
3174 return err;
3175 }
3176 }
3177
3178 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3179 return 0;
3180 }
3181
3182 static bool sci_exists(struct net_device *dev, sci_t sci)
3183 {
3184 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3185 struct macsec_dev *macsec;
3186
3187 list_for_each_entry(macsec, &rxd->secys, secys) {
3188 if (macsec->secy.sci == sci)
3189 return true;
3190 }
3191
3192 return false;
3193 }
3194
3195 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3196 {
3197 return make_sci(dev->dev_addr, port);
3198 }
3199
3200 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3201 {
3202 struct macsec_dev *macsec = macsec_priv(dev);
3203 struct macsec_secy *secy = &macsec->secy;
3204
3205 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3206 if (!macsec->stats)
3207 return -ENOMEM;
3208
3209 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3210 if (!secy->tx_sc.stats) {
3211 free_percpu(macsec->stats);
3212 return -ENOMEM;
3213 }
3214
3215 if (sci == MACSEC_UNDEF_SCI)
3216 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3217
3218 secy->netdev = dev;
3219 secy->operational = true;
3220 secy->key_len = DEFAULT_SAK_LEN;
3221 secy->icv_len = icv_len;
3222 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3223 secy->protect_frames = true;
3224 secy->replay_protect = false;
3225
3226 secy->sci = sci;
3227 secy->tx_sc.active = true;
3228 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3229 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3230 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3231 secy->tx_sc.end_station = false;
3232 secy->tx_sc.scb = false;
3233
3234 return 0;
3235 }
3236
3237 static int macsec_newlink(struct net *net, struct net_device *dev,
3238 struct nlattr *tb[], struct nlattr *data[],
3239 struct netlink_ext_ack *extack)
3240 {
3241 struct macsec_dev *macsec = macsec_priv(dev);
3242 struct net_device *real_dev;
3243 int err;
3244 sci_t sci;
3245 u8 icv_len = DEFAULT_ICV_LEN;
3246 rx_handler_func_t *rx_handler;
3247
3248 if (!tb[IFLA_LINK])
3249 return -EINVAL;
3250 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3251 if (!real_dev)
3252 return -ENODEV;
3253
3254 dev->priv_flags |= IFF_MACSEC;
3255
3256 macsec->real_dev = real_dev;
3257
3258 if (data && data[IFLA_MACSEC_ICV_LEN])
3259 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3260 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3261
3262 rx_handler = rtnl_dereference(real_dev->rx_handler);
3263 if (rx_handler && rx_handler != macsec_handle_frame)
3264 return -EBUSY;
3265
3266 err = register_netdevice(dev);
3267 if (err < 0)
3268 return err;
3269
3270 dev_hold(real_dev);
3271
3272 macsec->nest_level = dev_get_nest_level(real_dev) + 1;
3273 netdev_lockdep_set_classes(dev);
3274 lockdep_set_class_and_subclass(&dev->addr_list_lock,
3275 &macsec_netdev_addr_lock_key,
3276 macsec_get_nest_level(dev));
3277
3278 err = netdev_upper_dev_link(real_dev, dev, extack);
3279 if (err < 0)
3280 goto unregister;
3281
3282 /* need to be already registered so that ->init has run and
3283 * the MAC addr is set
3284 */
3285 if (data && data[IFLA_MACSEC_SCI])
3286 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3287 else if (data && data[IFLA_MACSEC_PORT])
3288 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3289 else
3290 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3291
3292 if (rx_handler && sci_exists(real_dev, sci)) {
3293 err = -EBUSY;
3294 goto unlink;
3295 }
3296
3297 err = macsec_add_dev(dev, sci, icv_len);
3298 if (err)
3299 goto unlink;
3300
3301 if (data) {
3302 err = macsec_changelink_common(dev, data);
3303 if (err)
3304 goto del_dev;
3305 }
3306
3307 err = register_macsec_dev(real_dev, dev);
3308 if (err < 0)
3309 goto del_dev;
3310
3311 macsec_generation++;
3312
3313 return 0;
3314
3315 del_dev:
3316 macsec_del_dev(macsec);
3317 unlink:
3318 netdev_upper_dev_unlink(real_dev, dev);
3319 unregister:
3320 unregister_netdevice(dev);
3321 return err;
3322 }
3323
3324 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
3325 struct netlink_ext_ack *extack)
3326 {
3327 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3328 u8 icv_len = DEFAULT_ICV_LEN;
3329 int flag;
3330 bool es, scb, sci;
3331
3332 if (!data)
3333 return 0;
3334
3335 if (data[IFLA_MACSEC_CIPHER_SUITE])
3336 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3337
3338 if (data[IFLA_MACSEC_ICV_LEN]) {
3339 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3340 if (icv_len != DEFAULT_ICV_LEN) {
3341 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
3342 struct crypto_aead *dummy_tfm;
3343
3344 dummy_tfm = macsec_alloc_tfm(dummy_key,
3345 DEFAULT_SAK_LEN,
3346 icv_len);
3347 if (IS_ERR(dummy_tfm))
3348 return PTR_ERR(dummy_tfm);
3349 crypto_free_aead(dummy_tfm);
3350 }
3351 }
3352
3353 switch (csid) {
3354 case MACSEC_CIPHER_ID_GCM_AES_128:
3355 case MACSEC_CIPHER_ID_GCM_AES_256:
3356 case MACSEC_DEFAULT_CIPHER_ID:
3357 if (icv_len < MACSEC_MIN_ICV_LEN ||
3358 icv_len > MACSEC_STD_ICV_LEN)
3359 return -EINVAL;
3360 break;
3361 default:
3362 return -EINVAL;
3363 }
3364
3365 if (data[IFLA_MACSEC_ENCODING_SA]) {
3366 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3367 return -EINVAL;
3368 }
3369
3370 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3371 flag < IFLA_MACSEC_VALIDATION;
3372 flag++) {
3373 if (data[flag]) {
3374 if (nla_get_u8(data[flag]) > 1)
3375 return -EINVAL;
3376 }
3377 }
3378
3379 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3380 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3381 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3382
3383 if ((sci && (scb || es)) || (scb && es))
3384 return -EINVAL;
3385
3386 if (data[IFLA_MACSEC_VALIDATION] &&
3387 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3388 return -EINVAL;
3389
3390 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3391 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3392 !data[IFLA_MACSEC_WINDOW])
3393 return -EINVAL;
3394
3395 return 0;
3396 }
3397
3398 static struct net *macsec_get_link_net(const struct net_device *dev)
3399 {
3400 return dev_net(macsec_priv(dev)->real_dev);
3401 }
3402
3403 static size_t macsec_get_size(const struct net_device *dev)
3404 {
3405 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
3406 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
3407 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
3408 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
3409 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
3410 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
3411 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
3412 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
3413 nla_total_size(1) + /* IFLA_MACSEC_ES */
3414 nla_total_size(1) + /* IFLA_MACSEC_SCB */
3415 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
3416 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
3417 0;
3418 }
3419
3420 static int macsec_fill_info(struct sk_buff *skb,
3421 const struct net_device *dev)
3422 {
3423 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3424 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3425 u64 csid;
3426
3427 switch (secy->key_len) {
3428 case MACSEC_GCM_AES_128_SAK_LEN:
3429 csid = MACSEC_DEFAULT_CIPHER_ID;
3430 break;
3431 case MACSEC_GCM_AES_256_SAK_LEN:
3432 csid = MACSEC_CIPHER_ID_GCM_AES_256;
3433 break;
3434 default:
3435 goto nla_put_failure;
3436 }
3437
3438 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
3439 IFLA_MACSEC_PAD) ||
3440 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3441 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
3442 csid, IFLA_MACSEC_PAD) ||
3443 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3444 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3445 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3446 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3447 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3448 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3449 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3450 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3451 0)
3452 goto nla_put_failure;
3453
3454 if (secy->replay_protect) {
3455 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3456 goto nla_put_failure;
3457 }
3458
3459 return 0;
3460
3461 nla_put_failure:
3462 return -EMSGSIZE;
3463 }
3464
3465 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3466 .kind = "macsec",
3467 .priv_size = sizeof(struct macsec_dev),
3468 .maxtype = IFLA_MACSEC_MAX,
3469 .policy = macsec_rtnl_policy,
3470 .setup = macsec_setup,
3471 .validate = macsec_validate_attr,
3472 .newlink = macsec_newlink,
3473 .changelink = macsec_changelink,
3474 .dellink = macsec_dellink,
3475 .get_size = macsec_get_size,
3476 .fill_info = macsec_fill_info,
3477 .get_link_net = macsec_get_link_net,
3478 };
3479
3480 static bool is_macsec_master(struct net_device *dev)
3481 {
3482 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3483 }
3484
3485 static int macsec_notify(struct notifier_block *this, unsigned long event,
3486 void *ptr)
3487 {
3488 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3489 LIST_HEAD(head);
3490
3491 if (!is_macsec_master(real_dev))
3492 return NOTIFY_DONE;
3493
3494 switch (event) {
3495 case NETDEV_UNREGISTER: {
3496 struct macsec_dev *m, *n;
3497 struct macsec_rxh_data *rxd;
3498
3499 rxd = macsec_data_rtnl(real_dev);
3500 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3501 macsec_common_dellink(m->secy.netdev, &head);
3502 }
3503
3504 netdev_rx_handler_unregister(real_dev);
3505 kfree(rxd);
3506
3507 unregister_netdevice_many(&head);
3508 break;
3509 }
3510 case NETDEV_CHANGEMTU: {
3511 struct macsec_dev *m;
3512 struct macsec_rxh_data *rxd;
3513
3514 rxd = macsec_data_rtnl(real_dev);
3515 list_for_each_entry(m, &rxd->secys, secys) {
3516 struct net_device *dev = m->secy.netdev;
3517 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3518 macsec_extra_len(true));
3519
3520 if (dev->mtu > mtu)
3521 dev_set_mtu(dev, mtu);
3522 }
3523 }
3524 }
3525
3526 return NOTIFY_OK;
3527 }
3528
3529 static struct notifier_block macsec_notifier = {
3530 .notifier_call = macsec_notify,
3531 };
3532
3533 static int __init macsec_init(void)
3534 {
3535 int err;
3536
3537 pr_info("MACsec IEEE 802.1AE\n");
3538 err = register_netdevice_notifier(&macsec_notifier);
3539 if (err)
3540 return err;
3541
3542 err = rtnl_link_register(&macsec_link_ops);
3543 if (err)
3544 goto notifier;
3545
3546 err = genl_register_family(&macsec_fam);
3547 if (err)
3548 goto rtnl;
3549
3550 return 0;
3551
3552 rtnl:
3553 rtnl_link_unregister(&macsec_link_ops);
3554 notifier:
3555 unregister_netdevice_notifier(&macsec_notifier);
3556 return err;
3557 }
3558
3559 static void __exit macsec_exit(void)
3560 {
3561 genl_unregister_family(&macsec_fam);
3562 rtnl_link_unregister(&macsec_link_ops);
3563 unregister_netdevice_notifier(&macsec_notifier);
3564 rcu_barrier();
3565 }
3566
3567 module_init(macsec_init);
3568 module_exit(macsec_exit);
3569
3570 MODULE_ALIAS_RTNL_LINK("macsec");
3571 MODULE_ALIAS_GENL_FAMILY("macsec");
3572
3573 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3574 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support