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[mirror_ubuntu-bionic-kernel.git] / drivers / net / macsec.c
1 /*
2 * drivers/net/macsec.c - MACsec device
3 *
4 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12 #include <linux/types.h>
13 #include <linux/skbuff.h>
14 #include <linux/socket.h>
15 #include <linux/module.h>
16 #include <crypto/aead.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rtnetlink.h>
19 #include <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 DEFAULT_SAK_LEN 16
397 #define DEFAULT_SEND_SCI true
398 #define DEFAULT_ENCRYPT false
399 #define DEFAULT_ENCODING_SA 0
400
401 static bool send_sci(const struct macsec_secy *secy)
402 {
403 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
404
405 return tx_sc->send_sci ||
406 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
407 }
408
409 static sci_t make_sci(u8 *addr, __be16 port)
410 {
411 sci_t sci;
412
413 memcpy(&sci, addr, ETH_ALEN);
414 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
415
416 return sci;
417 }
418
419 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
420 {
421 sci_t sci;
422
423 if (sci_present)
424 memcpy(&sci, hdr->secure_channel_id,
425 sizeof(hdr->secure_channel_id));
426 else
427 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
428
429 return sci;
430 }
431
432 static unsigned int macsec_sectag_len(bool sci_present)
433 {
434 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
435 }
436
437 static unsigned int macsec_hdr_len(bool sci_present)
438 {
439 return macsec_sectag_len(sci_present) + ETH_HLEN;
440 }
441
442 static unsigned int macsec_extra_len(bool sci_present)
443 {
444 return macsec_sectag_len(sci_present) + sizeof(__be16);
445 }
446
447 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
448 static void macsec_fill_sectag(struct macsec_eth_header *h,
449 const struct macsec_secy *secy, u32 pn,
450 bool sci_present)
451 {
452 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
453
454 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
455 h->eth.h_proto = htons(ETH_P_MACSEC);
456
457 if (sci_present) {
458 h->tci_an |= MACSEC_TCI_SC;
459 memcpy(&h->secure_channel_id, &secy->sci,
460 sizeof(h->secure_channel_id));
461 } else {
462 if (tx_sc->end_station)
463 h->tci_an |= MACSEC_TCI_ES;
464 if (tx_sc->scb)
465 h->tci_an |= MACSEC_TCI_SCB;
466 }
467
468 h->packet_number = htonl(pn);
469
470 /* with GCM, C/E clear for !encrypt, both set for encrypt */
471 if (tx_sc->encrypt)
472 h->tci_an |= MACSEC_TCI_CONFID;
473 else if (secy->icv_len != DEFAULT_ICV_LEN)
474 h->tci_an |= MACSEC_TCI_C;
475
476 h->tci_an |= tx_sc->encoding_sa;
477 }
478
479 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
480 {
481 if (data_len < MIN_NON_SHORT_LEN)
482 h->short_length = data_len;
483 }
484
485 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
486 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
487 {
488 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
489 int len = skb->len - 2 * ETH_ALEN;
490 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
491
492 /* a) It comprises at least 17 octets */
493 if (skb->len <= 16)
494 return false;
495
496 /* b) MACsec EtherType: already checked */
497
498 /* c) V bit is clear */
499 if (h->tci_an & MACSEC_TCI_VERSION)
500 return false;
501
502 /* d) ES or SCB => !SC */
503 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
504 (h->tci_an & MACSEC_TCI_SC))
505 return false;
506
507 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
508 if (h->unused)
509 return false;
510
511 /* rx.pn != 0 (figure 10-5) */
512 if (!h->packet_number)
513 return false;
514
515 /* length check, f) g) h) i) */
516 if (h->short_length)
517 return len == extra_len + h->short_length;
518 return len >= extra_len + MIN_NON_SHORT_LEN;
519 }
520
521 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
522 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
523
524 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
525 {
526 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
527
528 gcm_iv->sci = sci;
529 gcm_iv->pn = htonl(pn);
530 }
531
532 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
533 {
534 return (struct macsec_eth_header *)skb_mac_header(skb);
535 }
536
537 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
538 {
539 u32 pn;
540
541 spin_lock_bh(&tx_sa->lock);
542 pn = tx_sa->next_pn;
543
544 tx_sa->next_pn++;
545 if (tx_sa->next_pn == 0) {
546 pr_debug("PN wrapped, transitioning to !oper\n");
547 tx_sa->active = false;
548 if (secy->protect_frames)
549 secy->operational = false;
550 }
551 spin_unlock_bh(&tx_sa->lock);
552
553 return pn;
554 }
555
556 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
557 {
558 struct macsec_dev *macsec = netdev_priv(dev);
559
560 skb->dev = macsec->real_dev;
561 skb_reset_mac_header(skb);
562 skb->protocol = eth_hdr(skb)->h_proto;
563 }
564
565 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
566 struct macsec_tx_sa *tx_sa)
567 {
568 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
569
570 u64_stats_update_begin(&txsc_stats->syncp);
571 if (tx_sc->encrypt) {
572 txsc_stats->stats.OutOctetsEncrypted += skb->len;
573 txsc_stats->stats.OutPktsEncrypted++;
574 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
575 } else {
576 txsc_stats->stats.OutOctetsProtected += skb->len;
577 txsc_stats->stats.OutPktsProtected++;
578 this_cpu_inc(tx_sa->stats->OutPktsProtected);
579 }
580 u64_stats_update_end(&txsc_stats->syncp);
581 }
582
583 static void count_tx(struct net_device *dev, int ret, int len)
584 {
585 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
586 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
587
588 u64_stats_update_begin(&stats->syncp);
589 stats->tx_packets++;
590 stats->tx_bytes += len;
591 u64_stats_update_end(&stats->syncp);
592 }
593 }
594
595 static void macsec_encrypt_done(struct crypto_async_request *base, int err)
596 {
597 struct sk_buff *skb = base->data;
598 struct net_device *dev = skb->dev;
599 struct macsec_dev *macsec = macsec_priv(dev);
600 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
601 int len, ret;
602
603 aead_request_free(macsec_skb_cb(skb)->req);
604
605 rcu_read_lock_bh();
606 macsec_encrypt_finish(skb, dev);
607 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
608 len = skb->len;
609 ret = dev_queue_xmit(skb);
610 count_tx(dev, ret, len);
611 rcu_read_unlock_bh();
612
613 macsec_txsa_put(sa);
614 dev_put(dev);
615 }
616
617 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
618 unsigned char **iv,
619 struct scatterlist **sg,
620 int num_frags)
621 {
622 size_t size, iv_offset, sg_offset;
623 struct aead_request *req;
624 void *tmp;
625
626 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
627 iv_offset = size;
628 size += GCM_AES_IV_LEN;
629
630 size = ALIGN(size, __alignof__(struct scatterlist));
631 sg_offset = size;
632 size += sizeof(struct scatterlist) * num_frags;
633
634 tmp = kmalloc(size, GFP_ATOMIC);
635 if (!tmp)
636 return NULL;
637
638 *iv = (unsigned char *)(tmp + iv_offset);
639 *sg = (struct scatterlist *)(tmp + sg_offset);
640 req = tmp;
641
642 aead_request_set_tfm(req, tfm);
643
644 return req;
645 }
646
647 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
648 struct net_device *dev)
649 {
650 int ret;
651 struct scatterlist *sg;
652 struct sk_buff *trailer;
653 unsigned char *iv;
654 struct ethhdr *eth;
655 struct macsec_eth_header *hh;
656 size_t unprotected_len;
657 struct aead_request *req;
658 struct macsec_secy *secy;
659 struct macsec_tx_sc *tx_sc;
660 struct macsec_tx_sa *tx_sa;
661 struct macsec_dev *macsec = macsec_priv(dev);
662 bool sci_present;
663 u32 pn;
664
665 secy = &macsec->secy;
666 tx_sc = &secy->tx_sc;
667
668 /* 10.5.1 TX SA assignment */
669 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
670 if (!tx_sa) {
671 secy->operational = false;
672 kfree_skb(skb);
673 return ERR_PTR(-EINVAL);
674 }
675
676 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
677 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
678 struct sk_buff *nskb = skb_copy_expand(skb,
679 MACSEC_NEEDED_HEADROOM,
680 MACSEC_NEEDED_TAILROOM,
681 GFP_ATOMIC);
682 if (likely(nskb)) {
683 consume_skb(skb);
684 skb = nskb;
685 } else {
686 macsec_txsa_put(tx_sa);
687 kfree_skb(skb);
688 return ERR_PTR(-ENOMEM);
689 }
690 } else {
691 skb = skb_unshare(skb, GFP_ATOMIC);
692 if (!skb) {
693 macsec_txsa_put(tx_sa);
694 return ERR_PTR(-ENOMEM);
695 }
696 }
697
698 unprotected_len = skb->len;
699 eth = eth_hdr(skb);
700 sci_present = send_sci(secy);
701 hh = skb_push(skb, macsec_extra_len(sci_present));
702 memmove(hh, eth, 2 * ETH_ALEN);
703
704 pn = tx_sa_update_pn(tx_sa, secy);
705 if (pn == 0) {
706 macsec_txsa_put(tx_sa);
707 kfree_skb(skb);
708 return ERR_PTR(-ENOLINK);
709 }
710 macsec_fill_sectag(hh, secy, pn, sci_present);
711 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
712
713 skb_put(skb, secy->icv_len);
714
715 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
716 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
717
718 u64_stats_update_begin(&secy_stats->syncp);
719 secy_stats->stats.OutPktsTooLong++;
720 u64_stats_update_end(&secy_stats->syncp);
721
722 macsec_txsa_put(tx_sa);
723 kfree_skb(skb);
724 return ERR_PTR(-EINVAL);
725 }
726
727 ret = skb_cow_data(skb, 0, &trailer);
728 if (unlikely(ret < 0)) {
729 macsec_txsa_put(tx_sa);
730 kfree_skb(skb);
731 return ERR_PTR(ret);
732 }
733
734 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
735 if (!req) {
736 macsec_txsa_put(tx_sa);
737 kfree_skb(skb);
738 return ERR_PTR(-ENOMEM);
739 }
740
741 macsec_fill_iv(iv, secy->sci, pn);
742
743 sg_init_table(sg, ret);
744 ret = skb_to_sgvec(skb, sg, 0, skb->len);
745 if (unlikely(ret < 0)) {
746 aead_request_free(req);
747 macsec_txsa_put(tx_sa);
748 kfree_skb(skb);
749 return ERR_PTR(ret);
750 }
751
752 if (tx_sc->encrypt) {
753 int len = skb->len - macsec_hdr_len(sci_present) -
754 secy->icv_len;
755 aead_request_set_crypt(req, sg, sg, len, iv);
756 aead_request_set_ad(req, macsec_hdr_len(sci_present));
757 } else {
758 aead_request_set_crypt(req, sg, sg, 0, iv);
759 aead_request_set_ad(req, skb->len - secy->icv_len);
760 }
761
762 macsec_skb_cb(skb)->req = req;
763 macsec_skb_cb(skb)->tx_sa = tx_sa;
764 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
765
766 dev_hold(skb->dev);
767 ret = crypto_aead_encrypt(req);
768 if (ret == -EINPROGRESS) {
769 return ERR_PTR(ret);
770 } else if (ret != 0) {
771 dev_put(skb->dev);
772 kfree_skb(skb);
773 aead_request_free(req);
774 macsec_txsa_put(tx_sa);
775 return ERR_PTR(-EINVAL);
776 }
777
778 dev_put(skb->dev);
779 aead_request_free(req);
780 macsec_txsa_put(tx_sa);
781
782 return skb;
783 }
784
785 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
786 {
787 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
788 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
789 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
790 u32 lowest_pn = 0;
791
792 spin_lock(&rx_sa->lock);
793 if (rx_sa->next_pn >= secy->replay_window)
794 lowest_pn = rx_sa->next_pn - secy->replay_window;
795
796 /* Now perform replay protection check again
797 * (see IEEE 802.1AE-2006 figure 10-5)
798 */
799 if (secy->replay_protect && pn < lowest_pn) {
800 spin_unlock(&rx_sa->lock);
801 u64_stats_update_begin(&rxsc_stats->syncp);
802 rxsc_stats->stats.InPktsLate++;
803 u64_stats_update_end(&rxsc_stats->syncp);
804 return false;
805 }
806
807 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
808 u64_stats_update_begin(&rxsc_stats->syncp);
809 if (hdr->tci_an & MACSEC_TCI_E)
810 rxsc_stats->stats.InOctetsDecrypted += skb->len;
811 else
812 rxsc_stats->stats.InOctetsValidated += skb->len;
813 u64_stats_update_end(&rxsc_stats->syncp);
814 }
815
816 if (!macsec_skb_cb(skb)->valid) {
817 spin_unlock(&rx_sa->lock);
818
819 /* 10.6.5 */
820 if (hdr->tci_an & MACSEC_TCI_C ||
821 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
822 u64_stats_update_begin(&rxsc_stats->syncp);
823 rxsc_stats->stats.InPktsNotValid++;
824 u64_stats_update_end(&rxsc_stats->syncp);
825 return false;
826 }
827
828 u64_stats_update_begin(&rxsc_stats->syncp);
829 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
830 rxsc_stats->stats.InPktsInvalid++;
831 this_cpu_inc(rx_sa->stats->InPktsInvalid);
832 } else if (pn < lowest_pn) {
833 rxsc_stats->stats.InPktsDelayed++;
834 } else {
835 rxsc_stats->stats.InPktsUnchecked++;
836 }
837 u64_stats_update_end(&rxsc_stats->syncp);
838 } else {
839 u64_stats_update_begin(&rxsc_stats->syncp);
840 if (pn < lowest_pn) {
841 rxsc_stats->stats.InPktsDelayed++;
842 } else {
843 rxsc_stats->stats.InPktsOK++;
844 this_cpu_inc(rx_sa->stats->InPktsOK);
845 }
846 u64_stats_update_end(&rxsc_stats->syncp);
847
848 if (pn >= rx_sa->next_pn)
849 rx_sa->next_pn = pn + 1;
850 spin_unlock(&rx_sa->lock);
851 }
852
853 return true;
854 }
855
856 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
857 {
858 skb->pkt_type = PACKET_HOST;
859 skb->protocol = eth_type_trans(skb, dev);
860
861 skb_reset_network_header(skb);
862 if (!skb_transport_header_was_set(skb))
863 skb_reset_transport_header(skb);
864 skb_reset_mac_len(skb);
865 }
866
867 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
868 {
869 skb->ip_summed = CHECKSUM_NONE;
870 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
871 skb_pull(skb, hdr_len);
872 pskb_trim_unique(skb, skb->len - icv_len);
873 }
874
875 static void count_rx(struct net_device *dev, int len)
876 {
877 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
878
879 u64_stats_update_begin(&stats->syncp);
880 stats->rx_packets++;
881 stats->rx_bytes += len;
882 u64_stats_update_end(&stats->syncp);
883 }
884
885 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
886 {
887 struct sk_buff *skb = base->data;
888 struct net_device *dev = skb->dev;
889 struct macsec_dev *macsec = macsec_priv(dev);
890 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
891 struct macsec_rx_sc *rx_sc = rx_sa->sc;
892 int len;
893 u32 pn;
894
895 aead_request_free(macsec_skb_cb(skb)->req);
896
897 if (!err)
898 macsec_skb_cb(skb)->valid = true;
899
900 rcu_read_lock_bh();
901 pn = ntohl(macsec_ethhdr(skb)->packet_number);
902 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
903 rcu_read_unlock_bh();
904 kfree_skb(skb);
905 goto out;
906 }
907
908 macsec_finalize_skb(skb, macsec->secy.icv_len,
909 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
910 macsec_reset_skb(skb, macsec->secy.netdev);
911
912 len = skb->len;
913 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
914 count_rx(dev, len);
915
916 rcu_read_unlock_bh();
917
918 out:
919 macsec_rxsa_put(rx_sa);
920 macsec_rxsc_put(rx_sc);
921 dev_put(dev);
922 }
923
924 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
925 struct net_device *dev,
926 struct macsec_rx_sa *rx_sa,
927 sci_t sci,
928 struct macsec_secy *secy)
929 {
930 int ret;
931 struct scatterlist *sg;
932 struct sk_buff *trailer;
933 unsigned char *iv;
934 struct aead_request *req;
935 struct macsec_eth_header *hdr;
936 u16 icv_len = secy->icv_len;
937
938 macsec_skb_cb(skb)->valid = false;
939 skb = skb_share_check(skb, GFP_ATOMIC);
940 if (!skb)
941 return ERR_PTR(-ENOMEM);
942
943 ret = skb_cow_data(skb, 0, &trailer);
944 if (unlikely(ret < 0)) {
945 kfree_skb(skb);
946 return ERR_PTR(ret);
947 }
948 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
949 if (!req) {
950 kfree_skb(skb);
951 return ERR_PTR(-ENOMEM);
952 }
953
954 hdr = (struct macsec_eth_header *)skb->data;
955 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
956
957 sg_init_table(sg, ret);
958 ret = skb_to_sgvec(skb, sg, 0, skb->len);
959 if (unlikely(ret < 0)) {
960 aead_request_free(req);
961 kfree_skb(skb);
962 return ERR_PTR(ret);
963 }
964
965 if (hdr->tci_an & MACSEC_TCI_E) {
966 /* confidentiality: ethernet + macsec header
967 * authenticated, encrypted payload
968 */
969 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
970
971 aead_request_set_crypt(req, sg, sg, len, iv);
972 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
973 skb = skb_unshare(skb, GFP_ATOMIC);
974 if (!skb) {
975 aead_request_free(req);
976 return ERR_PTR(-ENOMEM);
977 }
978 } else {
979 /* integrity only: all headers + data authenticated */
980 aead_request_set_crypt(req, sg, sg, icv_len, iv);
981 aead_request_set_ad(req, skb->len - icv_len);
982 }
983
984 macsec_skb_cb(skb)->req = req;
985 skb->dev = dev;
986 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
987
988 dev_hold(dev);
989 ret = crypto_aead_decrypt(req);
990 if (ret == -EINPROGRESS) {
991 return ERR_PTR(ret);
992 } else if (ret != 0) {
993 /* decryption/authentication failed
994 * 10.6 if validateFrames is disabled, deliver anyway
995 */
996 if (ret != -EBADMSG) {
997 kfree_skb(skb);
998 skb = ERR_PTR(ret);
999 }
1000 } else {
1001 macsec_skb_cb(skb)->valid = true;
1002 }
1003 dev_put(dev);
1004
1005 aead_request_free(req);
1006
1007 return skb;
1008 }
1009
1010 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
1011 {
1012 struct macsec_rx_sc *rx_sc;
1013
1014 for_each_rxsc(secy, rx_sc) {
1015 if (rx_sc->sci == sci)
1016 return rx_sc;
1017 }
1018
1019 return NULL;
1020 }
1021
1022 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
1023 {
1024 struct macsec_rx_sc *rx_sc;
1025
1026 for_each_rxsc_rtnl(secy, rx_sc) {
1027 if (rx_sc->sci == sci)
1028 return rx_sc;
1029 }
1030
1031 return NULL;
1032 }
1033
1034 static void handle_not_macsec(struct sk_buff *skb)
1035 {
1036 struct macsec_rxh_data *rxd;
1037 struct macsec_dev *macsec;
1038
1039 rcu_read_lock();
1040 rxd = macsec_data_rcu(skb->dev);
1041
1042 /* 10.6 If the management control validateFrames is not
1043 * Strict, frames without a SecTAG are received, counted, and
1044 * delivered to the Controlled Port
1045 */
1046 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1047 struct sk_buff *nskb;
1048 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1049
1050 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1051 u64_stats_update_begin(&secy_stats->syncp);
1052 secy_stats->stats.InPktsNoTag++;
1053 u64_stats_update_end(&secy_stats->syncp);
1054 continue;
1055 }
1056
1057 /* deliver on this port */
1058 nskb = skb_clone(skb, GFP_ATOMIC);
1059 if (!nskb)
1060 break;
1061
1062 nskb->dev = macsec->secy.netdev;
1063
1064 if (netif_rx(nskb) == NET_RX_SUCCESS) {
1065 u64_stats_update_begin(&secy_stats->syncp);
1066 secy_stats->stats.InPktsUntagged++;
1067 u64_stats_update_end(&secy_stats->syncp);
1068 }
1069 }
1070
1071 rcu_read_unlock();
1072 }
1073
1074 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1075 {
1076 struct sk_buff *skb = *pskb;
1077 struct net_device *dev = skb->dev;
1078 struct macsec_eth_header *hdr;
1079 struct macsec_secy *secy = NULL;
1080 struct macsec_rx_sc *rx_sc;
1081 struct macsec_rx_sa *rx_sa;
1082 struct macsec_rxh_data *rxd;
1083 struct macsec_dev *macsec;
1084 sci_t sci;
1085 u32 pn;
1086 bool cbit;
1087 struct pcpu_rx_sc_stats *rxsc_stats;
1088 struct pcpu_secy_stats *secy_stats;
1089 bool pulled_sci;
1090 int ret;
1091
1092 if (skb_headroom(skb) < ETH_HLEN)
1093 goto drop_direct;
1094
1095 hdr = macsec_ethhdr(skb);
1096 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1097 handle_not_macsec(skb);
1098
1099 /* and deliver to the uncontrolled port */
1100 return RX_HANDLER_PASS;
1101 }
1102
1103 skb = skb_unshare(skb, GFP_ATOMIC);
1104 *pskb = skb;
1105 if (!skb)
1106 return RX_HANDLER_CONSUMED;
1107
1108 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1109 if (!pulled_sci) {
1110 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1111 goto drop_direct;
1112 }
1113
1114 hdr = macsec_ethhdr(skb);
1115
1116 /* Frames with a SecTAG that has the TCI E bit set but the C
1117 * bit clear are discarded, as this reserved encoding is used
1118 * to identify frames with a SecTAG that are not to be
1119 * delivered to the Controlled Port.
1120 */
1121 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1122 return RX_HANDLER_PASS;
1123
1124 /* now, pull the extra length */
1125 if (hdr->tci_an & MACSEC_TCI_SC) {
1126 if (!pulled_sci)
1127 goto drop_direct;
1128 }
1129
1130 /* ethernet header is part of crypto processing */
1131 skb_push(skb, ETH_HLEN);
1132
1133 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1134 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1135 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1136
1137 rcu_read_lock();
1138 rxd = macsec_data_rcu(skb->dev);
1139
1140 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1141 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1142 sc = sc ? macsec_rxsc_get(sc) : NULL;
1143
1144 if (sc) {
1145 secy = &macsec->secy;
1146 rx_sc = sc;
1147 break;
1148 }
1149 }
1150
1151 if (!secy)
1152 goto nosci;
1153
1154 dev = secy->netdev;
1155 macsec = macsec_priv(dev);
1156 secy_stats = this_cpu_ptr(macsec->stats);
1157 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1158
1159 if (!macsec_validate_skb(skb, secy->icv_len)) {
1160 u64_stats_update_begin(&secy_stats->syncp);
1161 secy_stats->stats.InPktsBadTag++;
1162 u64_stats_update_end(&secy_stats->syncp);
1163 goto drop_nosa;
1164 }
1165
1166 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1167 if (!rx_sa) {
1168 /* 10.6.1 if the SA is not in use */
1169
1170 /* If validateFrames is Strict or the C bit in the
1171 * SecTAG is set, discard
1172 */
1173 if (hdr->tci_an & MACSEC_TCI_C ||
1174 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1175 u64_stats_update_begin(&rxsc_stats->syncp);
1176 rxsc_stats->stats.InPktsNotUsingSA++;
1177 u64_stats_update_end(&rxsc_stats->syncp);
1178 goto drop_nosa;
1179 }
1180
1181 /* not Strict, the frame (with the SecTAG and ICV
1182 * removed) is delivered to the Controlled Port.
1183 */
1184 u64_stats_update_begin(&rxsc_stats->syncp);
1185 rxsc_stats->stats.InPktsUnusedSA++;
1186 u64_stats_update_end(&rxsc_stats->syncp);
1187 goto deliver;
1188 }
1189
1190 /* First, PN check to avoid decrypting obviously wrong packets */
1191 pn = ntohl(hdr->packet_number);
1192 if (secy->replay_protect) {
1193 bool late;
1194
1195 spin_lock(&rx_sa->lock);
1196 late = rx_sa->next_pn >= secy->replay_window &&
1197 pn < (rx_sa->next_pn - secy->replay_window);
1198 spin_unlock(&rx_sa->lock);
1199
1200 if (late) {
1201 u64_stats_update_begin(&rxsc_stats->syncp);
1202 rxsc_stats->stats.InPktsLate++;
1203 u64_stats_update_end(&rxsc_stats->syncp);
1204 goto drop;
1205 }
1206 }
1207
1208 macsec_skb_cb(skb)->rx_sa = rx_sa;
1209
1210 /* Disabled && !changed text => skip validation */
1211 if (hdr->tci_an & MACSEC_TCI_C ||
1212 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1213 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1214
1215 if (IS_ERR(skb)) {
1216 /* the decrypt callback needs the reference */
1217 if (PTR_ERR(skb) != -EINPROGRESS) {
1218 macsec_rxsa_put(rx_sa);
1219 macsec_rxsc_put(rx_sc);
1220 }
1221 rcu_read_unlock();
1222 *pskb = NULL;
1223 return RX_HANDLER_CONSUMED;
1224 }
1225
1226 if (!macsec_post_decrypt(skb, secy, pn))
1227 goto drop;
1228
1229 deliver:
1230 macsec_finalize_skb(skb, secy->icv_len,
1231 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1232 macsec_reset_skb(skb, secy->netdev);
1233
1234 if (rx_sa)
1235 macsec_rxsa_put(rx_sa);
1236 macsec_rxsc_put(rx_sc);
1237
1238 skb_orphan(skb);
1239 ret = gro_cells_receive(&macsec->gro_cells, skb);
1240 if (ret == NET_RX_SUCCESS)
1241 count_rx(dev, skb->len);
1242 else
1243 macsec->secy.netdev->stats.rx_dropped++;
1244
1245 rcu_read_unlock();
1246
1247 *pskb = NULL;
1248 return RX_HANDLER_CONSUMED;
1249
1250 drop:
1251 macsec_rxsa_put(rx_sa);
1252 drop_nosa:
1253 macsec_rxsc_put(rx_sc);
1254 rcu_read_unlock();
1255 drop_direct:
1256 kfree_skb(skb);
1257 *pskb = NULL;
1258 return RX_HANDLER_CONSUMED;
1259
1260 nosci:
1261 /* 10.6.1 if the SC is not found */
1262 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1263 if (!cbit)
1264 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1265 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1266
1267 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1268 struct sk_buff *nskb;
1269
1270 secy_stats = this_cpu_ptr(macsec->stats);
1271
1272 /* If validateFrames is Strict or the C bit in the
1273 * SecTAG is set, discard
1274 */
1275 if (cbit ||
1276 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1277 u64_stats_update_begin(&secy_stats->syncp);
1278 secy_stats->stats.InPktsNoSCI++;
1279 u64_stats_update_end(&secy_stats->syncp);
1280 continue;
1281 }
1282
1283 /* not strict, the frame (with the SecTAG and ICV
1284 * removed) is delivered to the Controlled Port.
1285 */
1286 nskb = skb_clone(skb, GFP_ATOMIC);
1287 if (!nskb)
1288 break;
1289
1290 macsec_reset_skb(nskb, macsec->secy.netdev);
1291
1292 ret = netif_rx(nskb);
1293 if (ret == NET_RX_SUCCESS) {
1294 u64_stats_update_begin(&secy_stats->syncp);
1295 secy_stats->stats.InPktsUnknownSCI++;
1296 u64_stats_update_end(&secy_stats->syncp);
1297 } else {
1298 macsec->secy.netdev->stats.rx_dropped++;
1299 }
1300 }
1301
1302 rcu_read_unlock();
1303 *pskb = skb;
1304 return RX_HANDLER_PASS;
1305 }
1306
1307 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1308 {
1309 struct crypto_aead *tfm;
1310 int ret;
1311
1312 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1313
1314 if (IS_ERR(tfm))
1315 return tfm;
1316
1317 ret = crypto_aead_setkey(tfm, key, key_len);
1318 if (ret < 0)
1319 goto fail;
1320
1321 ret = crypto_aead_setauthsize(tfm, icv_len);
1322 if (ret < 0)
1323 goto fail;
1324
1325 return tfm;
1326 fail:
1327 crypto_free_aead(tfm);
1328 return ERR_PTR(ret);
1329 }
1330
1331 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1332 int icv_len)
1333 {
1334 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1335 if (!rx_sa->stats)
1336 return -ENOMEM;
1337
1338 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1339 if (IS_ERR(rx_sa->key.tfm)) {
1340 free_percpu(rx_sa->stats);
1341 return PTR_ERR(rx_sa->key.tfm);
1342 }
1343
1344 rx_sa->active = false;
1345 rx_sa->next_pn = 1;
1346 refcount_set(&rx_sa->refcnt, 1);
1347 spin_lock_init(&rx_sa->lock);
1348
1349 return 0;
1350 }
1351
1352 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1353 {
1354 rx_sa->active = false;
1355
1356 macsec_rxsa_put(rx_sa);
1357 }
1358
1359 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1360 {
1361 int i;
1362
1363 for (i = 0; i < MACSEC_NUM_AN; i++) {
1364 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1365
1366 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1367 if (sa)
1368 clear_rx_sa(sa);
1369 }
1370
1371 macsec_rxsc_put(rx_sc);
1372 }
1373
1374 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1375 {
1376 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1377
1378 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1379 rx_sc;
1380 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1381 if (rx_sc->sci == sci) {
1382 if (rx_sc->active)
1383 secy->n_rx_sc--;
1384 rcu_assign_pointer(*rx_scp, rx_sc->next);
1385 return rx_sc;
1386 }
1387 }
1388
1389 return NULL;
1390 }
1391
1392 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1393 {
1394 struct macsec_rx_sc *rx_sc;
1395 struct macsec_dev *macsec;
1396 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1397 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1398 struct macsec_secy *secy;
1399
1400 list_for_each_entry(macsec, &rxd->secys, secys) {
1401 if (find_rx_sc_rtnl(&macsec->secy, sci))
1402 return ERR_PTR(-EEXIST);
1403 }
1404
1405 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1406 if (!rx_sc)
1407 return ERR_PTR(-ENOMEM);
1408
1409 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1410 if (!rx_sc->stats) {
1411 kfree(rx_sc);
1412 return ERR_PTR(-ENOMEM);
1413 }
1414
1415 rx_sc->sci = sci;
1416 rx_sc->active = true;
1417 refcount_set(&rx_sc->refcnt, 1);
1418
1419 secy = &macsec_priv(dev)->secy;
1420 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1421 rcu_assign_pointer(secy->rx_sc, rx_sc);
1422
1423 if (rx_sc->active)
1424 secy->n_rx_sc++;
1425
1426 return rx_sc;
1427 }
1428
1429 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1430 int icv_len)
1431 {
1432 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1433 if (!tx_sa->stats)
1434 return -ENOMEM;
1435
1436 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1437 if (IS_ERR(tx_sa->key.tfm)) {
1438 free_percpu(tx_sa->stats);
1439 return PTR_ERR(tx_sa->key.tfm);
1440 }
1441
1442 tx_sa->active = false;
1443 refcount_set(&tx_sa->refcnt, 1);
1444 spin_lock_init(&tx_sa->lock);
1445
1446 return 0;
1447 }
1448
1449 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1450 {
1451 tx_sa->active = false;
1452
1453 macsec_txsa_put(tx_sa);
1454 }
1455
1456 static struct genl_family macsec_fam;
1457
1458 static struct net_device *get_dev_from_nl(struct net *net,
1459 struct nlattr **attrs)
1460 {
1461 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1462 struct net_device *dev;
1463
1464 dev = __dev_get_by_index(net, ifindex);
1465 if (!dev)
1466 return ERR_PTR(-ENODEV);
1467
1468 if (!netif_is_macsec(dev))
1469 return ERR_PTR(-ENODEV);
1470
1471 return dev;
1472 }
1473
1474 static sci_t nla_get_sci(const struct nlattr *nla)
1475 {
1476 return (__force sci_t)nla_get_u64(nla);
1477 }
1478
1479 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1480 int padattr)
1481 {
1482 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1483 }
1484
1485 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1486 struct nlattr **attrs,
1487 struct nlattr **tb_sa,
1488 struct net_device **devp,
1489 struct macsec_secy **secyp,
1490 struct macsec_tx_sc **scp,
1491 u8 *assoc_num)
1492 {
1493 struct net_device *dev;
1494 struct macsec_secy *secy;
1495 struct macsec_tx_sc *tx_sc;
1496 struct macsec_tx_sa *tx_sa;
1497
1498 if (!tb_sa[MACSEC_SA_ATTR_AN])
1499 return ERR_PTR(-EINVAL);
1500
1501 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1502
1503 dev = get_dev_from_nl(net, attrs);
1504 if (IS_ERR(dev))
1505 return ERR_CAST(dev);
1506
1507 if (*assoc_num >= MACSEC_NUM_AN)
1508 return ERR_PTR(-EINVAL);
1509
1510 secy = &macsec_priv(dev)->secy;
1511 tx_sc = &secy->tx_sc;
1512
1513 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1514 if (!tx_sa)
1515 return ERR_PTR(-ENODEV);
1516
1517 *devp = dev;
1518 *scp = tx_sc;
1519 *secyp = secy;
1520 return tx_sa;
1521 }
1522
1523 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1524 struct nlattr **attrs,
1525 struct nlattr **tb_rxsc,
1526 struct net_device **devp,
1527 struct macsec_secy **secyp)
1528 {
1529 struct net_device *dev;
1530 struct macsec_secy *secy;
1531 struct macsec_rx_sc *rx_sc;
1532 sci_t sci;
1533
1534 dev = get_dev_from_nl(net, attrs);
1535 if (IS_ERR(dev))
1536 return ERR_CAST(dev);
1537
1538 secy = &macsec_priv(dev)->secy;
1539
1540 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1541 return ERR_PTR(-EINVAL);
1542
1543 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1544 rx_sc = find_rx_sc_rtnl(secy, sci);
1545 if (!rx_sc)
1546 return ERR_PTR(-ENODEV);
1547
1548 *secyp = secy;
1549 *devp = dev;
1550
1551 return rx_sc;
1552 }
1553
1554 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1555 struct nlattr **attrs,
1556 struct nlattr **tb_rxsc,
1557 struct nlattr **tb_sa,
1558 struct net_device **devp,
1559 struct macsec_secy **secyp,
1560 struct macsec_rx_sc **scp,
1561 u8 *assoc_num)
1562 {
1563 struct macsec_rx_sc *rx_sc;
1564 struct macsec_rx_sa *rx_sa;
1565
1566 if (!tb_sa[MACSEC_SA_ATTR_AN])
1567 return ERR_PTR(-EINVAL);
1568
1569 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1570 if (*assoc_num >= MACSEC_NUM_AN)
1571 return ERR_PTR(-EINVAL);
1572
1573 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1574 if (IS_ERR(rx_sc))
1575 return ERR_CAST(rx_sc);
1576
1577 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1578 if (!rx_sa)
1579 return ERR_PTR(-ENODEV);
1580
1581 *scp = rx_sc;
1582 return rx_sa;
1583 }
1584
1585
1586 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1587 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1588 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1589 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1590 };
1591
1592 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1593 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1594 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1595 };
1596
1597 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1598 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1599 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1600 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1601 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1602 .len = MACSEC_KEYID_LEN, },
1603 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1604 .len = MACSEC_MAX_KEY_LEN, },
1605 };
1606
1607 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1608 {
1609 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1610 return -EINVAL;
1611
1612 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX,
1613 attrs[MACSEC_ATTR_SA_CONFIG],
1614 macsec_genl_sa_policy, NULL))
1615 return -EINVAL;
1616
1617 return 0;
1618 }
1619
1620 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1621 {
1622 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1623 return -EINVAL;
1624
1625 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX,
1626 attrs[MACSEC_ATTR_RXSC_CONFIG],
1627 macsec_genl_rxsc_policy, NULL))
1628 return -EINVAL;
1629
1630 return 0;
1631 }
1632
1633 static bool validate_add_rxsa(struct nlattr **attrs)
1634 {
1635 if (!attrs[MACSEC_SA_ATTR_AN] ||
1636 !attrs[MACSEC_SA_ATTR_KEY] ||
1637 !attrs[MACSEC_SA_ATTR_KEYID])
1638 return false;
1639
1640 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1641 return false;
1642
1643 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1644 return false;
1645
1646 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1647 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1648 return false;
1649 }
1650
1651 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1652 return false;
1653
1654 return true;
1655 }
1656
1657 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1658 {
1659 struct net_device *dev;
1660 struct nlattr **attrs = info->attrs;
1661 struct macsec_secy *secy;
1662 struct macsec_rx_sc *rx_sc;
1663 struct macsec_rx_sa *rx_sa;
1664 unsigned char assoc_num;
1665 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1666 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1667 int err;
1668
1669 if (!attrs[MACSEC_ATTR_IFINDEX])
1670 return -EINVAL;
1671
1672 if (parse_sa_config(attrs, tb_sa))
1673 return -EINVAL;
1674
1675 if (parse_rxsc_config(attrs, tb_rxsc))
1676 return -EINVAL;
1677
1678 if (!validate_add_rxsa(tb_sa))
1679 return -EINVAL;
1680
1681 rtnl_lock();
1682 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1683 if (IS_ERR(rx_sc)) {
1684 rtnl_unlock();
1685 return PTR_ERR(rx_sc);
1686 }
1687
1688 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1689
1690 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1691 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1692 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1693 rtnl_unlock();
1694 return -EINVAL;
1695 }
1696
1697 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1698 if (rx_sa) {
1699 rtnl_unlock();
1700 return -EBUSY;
1701 }
1702
1703 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1704 if (!rx_sa) {
1705 rtnl_unlock();
1706 return -ENOMEM;
1707 }
1708
1709 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1710 secy->key_len, secy->icv_len);
1711 if (err < 0) {
1712 kfree(rx_sa);
1713 rtnl_unlock();
1714 return err;
1715 }
1716
1717 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1718 spin_lock_bh(&rx_sa->lock);
1719 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1720 spin_unlock_bh(&rx_sa->lock);
1721 }
1722
1723 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1724 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1725
1726 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1727 rx_sa->sc = rx_sc;
1728 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1729
1730 rtnl_unlock();
1731
1732 return 0;
1733 }
1734
1735 static bool validate_add_rxsc(struct nlattr **attrs)
1736 {
1737 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1738 return false;
1739
1740 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1741 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1742 return false;
1743 }
1744
1745 return true;
1746 }
1747
1748 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1749 {
1750 struct net_device *dev;
1751 sci_t sci = MACSEC_UNDEF_SCI;
1752 struct nlattr **attrs = info->attrs;
1753 struct macsec_rx_sc *rx_sc;
1754 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1755
1756 if (!attrs[MACSEC_ATTR_IFINDEX])
1757 return -EINVAL;
1758
1759 if (parse_rxsc_config(attrs, tb_rxsc))
1760 return -EINVAL;
1761
1762 if (!validate_add_rxsc(tb_rxsc))
1763 return -EINVAL;
1764
1765 rtnl_lock();
1766 dev = get_dev_from_nl(genl_info_net(info), attrs);
1767 if (IS_ERR(dev)) {
1768 rtnl_unlock();
1769 return PTR_ERR(dev);
1770 }
1771
1772 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1773
1774 rx_sc = create_rx_sc(dev, sci);
1775 if (IS_ERR(rx_sc)) {
1776 rtnl_unlock();
1777 return PTR_ERR(rx_sc);
1778 }
1779
1780 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1781 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1782
1783 rtnl_unlock();
1784
1785 return 0;
1786 }
1787
1788 static bool validate_add_txsa(struct nlattr **attrs)
1789 {
1790 if (!attrs[MACSEC_SA_ATTR_AN] ||
1791 !attrs[MACSEC_SA_ATTR_PN] ||
1792 !attrs[MACSEC_SA_ATTR_KEY] ||
1793 !attrs[MACSEC_SA_ATTR_KEYID])
1794 return false;
1795
1796 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1797 return false;
1798
1799 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1800 return false;
1801
1802 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1803 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1804 return false;
1805 }
1806
1807 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1808 return false;
1809
1810 return true;
1811 }
1812
1813 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1814 {
1815 struct net_device *dev;
1816 struct nlattr **attrs = info->attrs;
1817 struct macsec_secy *secy;
1818 struct macsec_tx_sc *tx_sc;
1819 struct macsec_tx_sa *tx_sa;
1820 unsigned char assoc_num;
1821 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1822 int err;
1823
1824 if (!attrs[MACSEC_ATTR_IFINDEX])
1825 return -EINVAL;
1826
1827 if (parse_sa_config(attrs, tb_sa))
1828 return -EINVAL;
1829
1830 if (!validate_add_txsa(tb_sa))
1831 return -EINVAL;
1832
1833 rtnl_lock();
1834 dev = get_dev_from_nl(genl_info_net(info), attrs);
1835 if (IS_ERR(dev)) {
1836 rtnl_unlock();
1837 return PTR_ERR(dev);
1838 }
1839
1840 secy = &macsec_priv(dev)->secy;
1841 tx_sc = &secy->tx_sc;
1842
1843 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1844
1845 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1846 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1847 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1848 rtnl_unlock();
1849 return -EINVAL;
1850 }
1851
1852 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1853 if (tx_sa) {
1854 rtnl_unlock();
1855 return -EBUSY;
1856 }
1857
1858 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1859 if (!tx_sa) {
1860 rtnl_unlock();
1861 return -ENOMEM;
1862 }
1863
1864 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1865 secy->key_len, secy->icv_len);
1866 if (err < 0) {
1867 kfree(tx_sa);
1868 rtnl_unlock();
1869 return err;
1870 }
1871
1872 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1873
1874 spin_lock_bh(&tx_sa->lock);
1875 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1876 spin_unlock_bh(&tx_sa->lock);
1877
1878 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1879 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1880
1881 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1882 secy->operational = true;
1883
1884 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1885
1886 rtnl_unlock();
1887
1888 return 0;
1889 }
1890
1891 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1892 {
1893 struct nlattr **attrs = info->attrs;
1894 struct net_device *dev;
1895 struct macsec_secy *secy;
1896 struct macsec_rx_sc *rx_sc;
1897 struct macsec_rx_sa *rx_sa;
1898 u8 assoc_num;
1899 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1900 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1901
1902 if (!attrs[MACSEC_ATTR_IFINDEX])
1903 return -EINVAL;
1904
1905 if (parse_sa_config(attrs, tb_sa))
1906 return -EINVAL;
1907
1908 if (parse_rxsc_config(attrs, tb_rxsc))
1909 return -EINVAL;
1910
1911 rtnl_lock();
1912 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1913 &dev, &secy, &rx_sc, &assoc_num);
1914 if (IS_ERR(rx_sa)) {
1915 rtnl_unlock();
1916 return PTR_ERR(rx_sa);
1917 }
1918
1919 if (rx_sa->active) {
1920 rtnl_unlock();
1921 return -EBUSY;
1922 }
1923
1924 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1925 clear_rx_sa(rx_sa);
1926
1927 rtnl_unlock();
1928
1929 return 0;
1930 }
1931
1932 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1933 {
1934 struct nlattr **attrs = info->attrs;
1935 struct net_device *dev;
1936 struct macsec_secy *secy;
1937 struct macsec_rx_sc *rx_sc;
1938 sci_t sci;
1939 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1940
1941 if (!attrs[MACSEC_ATTR_IFINDEX])
1942 return -EINVAL;
1943
1944 if (parse_rxsc_config(attrs, tb_rxsc))
1945 return -EINVAL;
1946
1947 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1948 return -EINVAL;
1949
1950 rtnl_lock();
1951 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1952 if (IS_ERR(dev)) {
1953 rtnl_unlock();
1954 return PTR_ERR(dev);
1955 }
1956
1957 secy = &macsec_priv(dev)->secy;
1958 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1959
1960 rx_sc = del_rx_sc(secy, sci);
1961 if (!rx_sc) {
1962 rtnl_unlock();
1963 return -ENODEV;
1964 }
1965
1966 free_rx_sc(rx_sc);
1967 rtnl_unlock();
1968
1969 return 0;
1970 }
1971
1972 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1973 {
1974 struct nlattr **attrs = info->attrs;
1975 struct net_device *dev;
1976 struct macsec_secy *secy;
1977 struct macsec_tx_sc *tx_sc;
1978 struct macsec_tx_sa *tx_sa;
1979 u8 assoc_num;
1980 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1981
1982 if (!attrs[MACSEC_ATTR_IFINDEX])
1983 return -EINVAL;
1984
1985 if (parse_sa_config(attrs, tb_sa))
1986 return -EINVAL;
1987
1988 rtnl_lock();
1989 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1990 &dev, &secy, &tx_sc, &assoc_num);
1991 if (IS_ERR(tx_sa)) {
1992 rtnl_unlock();
1993 return PTR_ERR(tx_sa);
1994 }
1995
1996 if (tx_sa->active) {
1997 rtnl_unlock();
1998 return -EBUSY;
1999 }
2000
2001 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2002 clear_tx_sa(tx_sa);
2003
2004 rtnl_unlock();
2005
2006 return 0;
2007 }
2008
2009 static bool validate_upd_sa(struct nlattr **attrs)
2010 {
2011 if (!attrs[MACSEC_SA_ATTR_AN] ||
2012 attrs[MACSEC_SA_ATTR_KEY] ||
2013 attrs[MACSEC_SA_ATTR_KEYID])
2014 return false;
2015
2016 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2017 return false;
2018
2019 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
2020 return false;
2021
2022 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2023 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2024 return false;
2025 }
2026
2027 return true;
2028 }
2029
2030 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2031 {
2032 struct nlattr **attrs = info->attrs;
2033 struct net_device *dev;
2034 struct macsec_secy *secy;
2035 struct macsec_tx_sc *tx_sc;
2036 struct macsec_tx_sa *tx_sa;
2037 u8 assoc_num;
2038 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2039
2040 if (!attrs[MACSEC_ATTR_IFINDEX])
2041 return -EINVAL;
2042
2043 if (parse_sa_config(attrs, tb_sa))
2044 return -EINVAL;
2045
2046 if (!validate_upd_sa(tb_sa))
2047 return -EINVAL;
2048
2049 rtnl_lock();
2050 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2051 &dev, &secy, &tx_sc, &assoc_num);
2052 if (IS_ERR(tx_sa)) {
2053 rtnl_unlock();
2054 return PTR_ERR(tx_sa);
2055 }
2056
2057 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2058 spin_lock_bh(&tx_sa->lock);
2059 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2060 spin_unlock_bh(&tx_sa->lock);
2061 }
2062
2063 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2064 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2065
2066 if (assoc_num == tx_sc->encoding_sa)
2067 secy->operational = tx_sa->active;
2068
2069 rtnl_unlock();
2070
2071 return 0;
2072 }
2073
2074 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2075 {
2076 struct nlattr **attrs = info->attrs;
2077 struct net_device *dev;
2078 struct macsec_secy *secy;
2079 struct macsec_rx_sc *rx_sc;
2080 struct macsec_rx_sa *rx_sa;
2081 u8 assoc_num;
2082 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2083 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2084
2085 if (!attrs[MACSEC_ATTR_IFINDEX])
2086 return -EINVAL;
2087
2088 if (parse_rxsc_config(attrs, tb_rxsc))
2089 return -EINVAL;
2090
2091 if (parse_sa_config(attrs, tb_sa))
2092 return -EINVAL;
2093
2094 if (!validate_upd_sa(tb_sa))
2095 return -EINVAL;
2096
2097 rtnl_lock();
2098 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2099 &dev, &secy, &rx_sc, &assoc_num);
2100 if (IS_ERR(rx_sa)) {
2101 rtnl_unlock();
2102 return PTR_ERR(rx_sa);
2103 }
2104
2105 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2106 spin_lock_bh(&rx_sa->lock);
2107 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2108 spin_unlock_bh(&rx_sa->lock);
2109 }
2110
2111 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2112 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2113
2114 rtnl_unlock();
2115 return 0;
2116 }
2117
2118 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2119 {
2120 struct nlattr **attrs = info->attrs;
2121 struct net_device *dev;
2122 struct macsec_secy *secy;
2123 struct macsec_rx_sc *rx_sc;
2124 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2125
2126 if (!attrs[MACSEC_ATTR_IFINDEX])
2127 return -EINVAL;
2128
2129 if (parse_rxsc_config(attrs, tb_rxsc))
2130 return -EINVAL;
2131
2132 if (!validate_add_rxsc(tb_rxsc))
2133 return -EINVAL;
2134
2135 rtnl_lock();
2136 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2137 if (IS_ERR(rx_sc)) {
2138 rtnl_unlock();
2139 return PTR_ERR(rx_sc);
2140 }
2141
2142 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2143 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2144
2145 if (rx_sc->active != new)
2146 secy->n_rx_sc += new ? 1 : -1;
2147
2148 rx_sc->active = new;
2149 }
2150
2151 rtnl_unlock();
2152
2153 return 0;
2154 }
2155
2156 static int copy_tx_sa_stats(struct sk_buff *skb,
2157 struct macsec_tx_sa_stats __percpu *pstats)
2158 {
2159 struct macsec_tx_sa_stats sum = {0, };
2160 int cpu;
2161
2162 for_each_possible_cpu(cpu) {
2163 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2164
2165 sum.OutPktsProtected += stats->OutPktsProtected;
2166 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2167 }
2168
2169 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2170 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2171 return -EMSGSIZE;
2172
2173 return 0;
2174 }
2175
2176 static int copy_rx_sa_stats(struct sk_buff *skb,
2177 struct macsec_rx_sa_stats __percpu *pstats)
2178 {
2179 struct macsec_rx_sa_stats sum = {0, };
2180 int cpu;
2181
2182 for_each_possible_cpu(cpu) {
2183 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2184
2185 sum.InPktsOK += stats->InPktsOK;
2186 sum.InPktsInvalid += stats->InPktsInvalid;
2187 sum.InPktsNotValid += stats->InPktsNotValid;
2188 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2189 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2190 }
2191
2192 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2193 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2194 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2195 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2196 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2197 return -EMSGSIZE;
2198
2199 return 0;
2200 }
2201
2202 static int copy_rx_sc_stats(struct sk_buff *skb,
2203 struct pcpu_rx_sc_stats __percpu *pstats)
2204 {
2205 struct macsec_rx_sc_stats sum = {0, };
2206 int cpu;
2207
2208 for_each_possible_cpu(cpu) {
2209 const struct pcpu_rx_sc_stats *stats;
2210 struct macsec_rx_sc_stats tmp;
2211 unsigned int start;
2212
2213 stats = per_cpu_ptr(pstats, cpu);
2214 do {
2215 start = u64_stats_fetch_begin_irq(&stats->syncp);
2216 memcpy(&tmp, &stats->stats, sizeof(tmp));
2217 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2218
2219 sum.InOctetsValidated += tmp.InOctetsValidated;
2220 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2221 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2222 sum.InPktsDelayed += tmp.InPktsDelayed;
2223 sum.InPktsOK += tmp.InPktsOK;
2224 sum.InPktsInvalid += tmp.InPktsInvalid;
2225 sum.InPktsLate += tmp.InPktsLate;
2226 sum.InPktsNotValid += tmp.InPktsNotValid;
2227 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2228 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2229 }
2230
2231 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2232 sum.InOctetsValidated,
2233 MACSEC_RXSC_STATS_ATTR_PAD) ||
2234 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2235 sum.InOctetsDecrypted,
2236 MACSEC_RXSC_STATS_ATTR_PAD) ||
2237 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2238 sum.InPktsUnchecked,
2239 MACSEC_RXSC_STATS_ATTR_PAD) ||
2240 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2241 sum.InPktsDelayed,
2242 MACSEC_RXSC_STATS_ATTR_PAD) ||
2243 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2244 sum.InPktsOK,
2245 MACSEC_RXSC_STATS_ATTR_PAD) ||
2246 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2247 sum.InPktsInvalid,
2248 MACSEC_RXSC_STATS_ATTR_PAD) ||
2249 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2250 sum.InPktsLate,
2251 MACSEC_RXSC_STATS_ATTR_PAD) ||
2252 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2253 sum.InPktsNotValid,
2254 MACSEC_RXSC_STATS_ATTR_PAD) ||
2255 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2256 sum.InPktsNotUsingSA,
2257 MACSEC_RXSC_STATS_ATTR_PAD) ||
2258 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2259 sum.InPktsUnusedSA,
2260 MACSEC_RXSC_STATS_ATTR_PAD))
2261 return -EMSGSIZE;
2262
2263 return 0;
2264 }
2265
2266 static int copy_tx_sc_stats(struct sk_buff *skb,
2267 struct pcpu_tx_sc_stats __percpu *pstats)
2268 {
2269 struct macsec_tx_sc_stats sum = {0, };
2270 int cpu;
2271
2272 for_each_possible_cpu(cpu) {
2273 const struct pcpu_tx_sc_stats *stats;
2274 struct macsec_tx_sc_stats tmp;
2275 unsigned int start;
2276
2277 stats = per_cpu_ptr(pstats, cpu);
2278 do {
2279 start = u64_stats_fetch_begin_irq(&stats->syncp);
2280 memcpy(&tmp, &stats->stats, sizeof(tmp));
2281 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2282
2283 sum.OutPktsProtected += tmp.OutPktsProtected;
2284 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2285 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2286 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2287 }
2288
2289 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2290 sum.OutPktsProtected,
2291 MACSEC_TXSC_STATS_ATTR_PAD) ||
2292 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2293 sum.OutPktsEncrypted,
2294 MACSEC_TXSC_STATS_ATTR_PAD) ||
2295 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2296 sum.OutOctetsProtected,
2297 MACSEC_TXSC_STATS_ATTR_PAD) ||
2298 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2299 sum.OutOctetsEncrypted,
2300 MACSEC_TXSC_STATS_ATTR_PAD))
2301 return -EMSGSIZE;
2302
2303 return 0;
2304 }
2305
2306 static int copy_secy_stats(struct sk_buff *skb,
2307 struct pcpu_secy_stats __percpu *pstats)
2308 {
2309 struct macsec_dev_stats sum = {0, };
2310 int cpu;
2311
2312 for_each_possible_cpu(cpu) {
2313 const struct pcpu_secy_stats *stats;
2314 struct macsec_dev_stats tmp;
2315 unsigned int start;
2316
2317 stats = per_cpu_ptr(pstats, cpu);
2318 do {
2319 start = u64_stats_fetch_begin_irq(&stats->syncp);
2320 memcpy(&tmp, &stats->stats, sizeof(tmp));
2321 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2322
2323 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2324 sum.InPktsUntagged += tmp.InPktsUntagged;
2325 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2326 sum.InPktsNoTag += tmp.InPktsNoTag;
2327 sum.InPktsBadTag += tmp.InPktsBadTag;
2328 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2329 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2330 sum.InPktsOverrun += tmp.InPktsOverrun;
2331 }
2332
2333 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2334 sum.OutPktsUntagged,
2335 MACSEC_SECY_STATS_ATTR_PAD) ||
2336 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2337 sum.InPktsUntagged,
2338 MACSEC_SECY_STATS_ATTR_PAD) ||
2339 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2340 sum.OutPktsTooLong,
2341 MACSEC_SECY_STATS_ATTR_PAD) ||
2342 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2343 sum.InPktsNoTag,
2344 MACSEC_SECY_STATS_ATTR_PAD) ||
2345 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2346 sum.InPktsBadTag,
2347 MACSEC_SECY_STATS_ATTR_PAD) ||
2348 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2349 sum.InPktsUnknownSCI,
2350 MACSEC_SECY_STATS_ATTR_PAD) ||
2351 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2352 sum.InPktsNoSCI,
2353 MACSEC_SECY_STATS_ATTR_PAD) ||
2354 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2355 sum.InPktsOverrun,
2356 MACSEC_SECY_STATS_ATTR_PAD))
2357 return -EMSGSIZE;
2358
2359 return 0;
2360 }
2361
2362 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2363 {
2364 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2365 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2366
2367 if (!secy_nest)
2368 return 1;
2369
2370 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2371 MACSEC_SECY_ATTR_PAD) ||
2372 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2373 MACSEC_DEFAULT_CIPHER_ID,
2374 MACSEC_SECY_ATTR_PAD) ||
2375 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2376 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2377 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2378 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2379 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2380 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2381 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2382 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2383 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2384 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2385 goto cancel;
2386
2387 if (secy->replay_protect) {
2388 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2389 goto cancel;
2390 }
2391
2392 nla_nest_end(skb, secy_nest);
2393 return 0;
2394
2395 cancel:
2396 nla_nest_cancel(skb, secy_nest);
2397 return 1;
2398 }
2399
2400 static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2401 struct sk_buff *skb, struct netlink_callback *cb)
2402 {
2403 struct macsec_rx_sc *rx_sc;
2404 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2405 struct nlattr *txsa_list, *rxsc_list;
2406 int i, j;
2407 void *hdr;
2408 struct nlattr *attr;
2409
2410 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2411 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2412 if (!hdr)
2413 return -EMSGSIZE;
2414
2415 genl_dump_check_consistent(cb, hdr);
2416
2417 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2418 goto nla_put_failure;
2419
2420 if (nla_put_secy(secy, skb))
2421 goto nla_put_failure;
2422
2423 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2424 if (!attr)
2425 goto nla_put_failure;
2426 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2427 nla_nest_cancel(skb, attr);
2428 goto nla_put_failure;
2429 }
2430 nla_nest_end(skb, attr);
2431
2432 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2433 if (!attr)
2434 goto nla_put_failure;
2435 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2436 nla_nest_cancel(skb, attr);
2437 goto nla_put_failure;
2438 }
2439 nla_nest_end(skb, attr);
2440
2441 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2442 if (!txsa_list)
2443 goto nla_put_failure;
2444 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2445 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2446 struct nlattr *txsa_nest;
2447
2448 if (!tx_sa)
2449 continue;
2450
2451 txsa_nest = nla_nest_start(skb, j++);
2452 if (!txsa_nest) {
2453 nla_nest_cancel(skb, txsa_list);
2454 goto nla_put_failure;
2455 }
2456
2457 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2458 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2459 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2460 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2461 nla_nest_cancel(skb, txsa_nest);
2462 nla_nest_cancel(skb, txsa_list);
2463 goto nla_put_failure;
2464 }
2465
2466 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2467 if (!attr) {
2468 nla_nest_cancel(skb, txsa_nest);
2469 nla_nest_cancel(skb, txsa_list);
2470 goto nla_put_failure;
2471 }
2472 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2473 nla_nest_cancel(skb, attr);
2474 nla_nest_cancel(skb, txsa_nest);
2475 nla_nest_cancel(skb, txsa_list);
2476 goto nla_put_failure;
2477 }
2478 nla_nest_end(skb, attr);
2479
2480 nla_nest_end(skb, txsa_nest);
2481 }
2482 nla_nest_end(skb, txsa_list);
2483
2484 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2485 if (!rxsc_list)
2486 goto nla_put_failure;
2487
2488 j = 1;
2489 for_each_rxsc_rtnl(secy, rx_sc) {
2490 int k;
2491 struct nlattr *rxsa_list;
2492 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2493
2494 if (!rxsc_nest) {
2495 nla_nest_cancel(skb, rxsc_list);
2496 goto nla_put_failure;
2497 }
2498
2499 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2500 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
2501 MACSEC_RXSC_ATTR_PAD)) {
2502 nla_nest_cancel(skb, rxsc_nest);
2503 nla_nest_cancel(skb, rxsc_list);
2504 goto nla_put_failure;
2505 }
2506
2507 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2508 if (!attr) {
2509 nla_nest_cancel(skb, rxsc_nest);
2510 nla_nest_cancel(skb, rxsc_list);
2511 goto nla_put_failure;
2512 }
2513 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2514 nla_nest_cancel(skb, attr);
2515 nla_nest_cancel(skb, rxsc_nest);
2516 nla_nest_cancel(skb, rxsc_list);
2517 goto nla_put_failure;
2518 }
2519 nla_nest_end(skb, attr);
2520
2521 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2522 if (!rxsa_list) {
2523 nla_nest_cancel(skb, rxsc_nest);
2524 nla_nest_cancel(skb, rxsc_list);
2525 goto nla_put_failure;
2526 }
2527
2528 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2529 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2530 struct nlattr *rxsa_nest;
2531
2532 if (!rx_sa)
2533 continue;
2534
2535 rxsa_nest = nla_nest_start(skb, k++);
2536 if (!rxsa_nest) {
2537 nla_nest_cancel(skb, rxsa_list);
2538 nla_nest_cancel(skb, rxsc_nest);
2539 nla_nest_cancel(skb, rxsc_list);
2540 goto nla_put_failure;
2541 }
2542
2543 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2544 if (!attr) {
2545 nla_nest_cancel(skb, rxsa_list);
2546 nla_nest_cancel(skb, rxsc_nest);
2547 nla_nest_cancel(skb, rxsc_list);
2548 goto nla_put_failure;
2549 }
2550 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2551 nla_nest_cancel(skb, attr);
2552 nla_nest_cancel(skb, rxsa_list);
2553 nla_nest_cancel(skb, rxsc_nest);
2554 nla_nest_cancel(skb, rxsc_list);
2555 goto nla_put_failure;
2556 }
2557 nla_nest_end(skb, attr);
2558
2559 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2560 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2561 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2562 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2563 nla_nest_cancel(skb, rxsa_nest);
2564 nla_nest_cancel(skb, rxsc_nest);
2565 nla_nest_cancel(skb, rxsc_list);
2566 goto nla_put_failure;
2567 }
2568 nla_nest_end(skb, rxsa_nest);
2569 }
2570
2571 nla_nest_end(skb, rxsa_list);
2572 nla_nest_end(skb, rxsc_nest);
2573 }
2574
2575 nla_nest_end(skb, rxsc_list);
2576
2577 genlmsg_end(skb, hdr);
2578
2579 return 0;
2580
2581 nla_put_failure:
2582 genlmsg_cancel(skb, hdr);
2583 return -EMSGSIZE;
2584 }
2585
2586 static int macsec_generation = 1; /* protected by RTNL */
2587
2588 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2589 {
2590 struct net *net = sock_net(skb->sk);
2591 struct net_device *dev;
2592 int dev_idx, d;
2593
2594 dev_idx = cb->args[0];
2595
2596 d = 0;
2597 rtnl_lock();
2598
2599 cb->seq = macsec_generation;
2600
2601 for_each_netdev(net, dev) {
2602 struct macsec_secy *secy;
2603
2604 if (d < dev_idx)
2605 goto next;
2606
2607 if (!netif_is_macsec(dev))
2608 goto next;
2609
2610 secy = &macsec_priv(dev)->secy;
2611 if (dump_secy(secy, dev, skb, cb) < 0)
2612 goto done;
2613 next:
2614 d++;
2615 }
2616
2617 done:
2618 rtnl_unlock();
2619 cb->args[0] = d;
2620 return skb->len;
2621 }
2622
2623 static const struct genl_ops macsec_genl_ops[] = {
2624 {
2625 .cmd = MACSEC_CMD_GET_TXSC,
2626 .dumpit = macsec_dump_txsc,
2627 .policy = macsec_genl_policy,
2628 },
2629 {
2630 .cmd = MACSEC_CMD_ADD_RXSC,
2631 .doit = macsec_add_rxsc,
2632 .policy = macsec_genl_policy,
2633 .flags = GENL_ADMIN_PERM,
2634 },
2635 {
2636 .cmd = MACSEC_CMD_DEL_RXSC,
2637 .doit = macsec_del_rxsc,
2638 .policy = macsec_genl_policy,
2639 .flags = GENL_ADMIN_PERM,
2640 },
2641 {
2642 .cmd = MACSEC_CMD_UPD_RXSC,
2643 .doit = macsec_upd_rxsc,
2644 .policy = macsec_genl_policy,
2645 .flags = GENL_ADMIN_PERM,
2646 },
2647 {
2648 .cmd = MACSEC_CMD_ADD_TXSA,
2649 .doit = macsec_add_txsa,
2650 .policy = macsec_genl_policy,
2651 .flags = GENL_ADMIN_PERM,
2652 },
2653 {
2654 .cmd = MACSEC_CMD_DEL_TXSA,
2655 .doit = macsec_del_txsa,
2656 .policy = macsec_genl_policy,
2657 .flags = GENL_ADMIN_PERM,
2658 },
2659 {
2660 .cmd = MACSEC_CMD_UPD_TXSA,
2661 .doit = macsec_upd_txsa,
2662 .policy = macsec_genl_policy,
2663 .flags = GENL_ADMIN_PERM,
2664 },
2665 {
2666 .cmd = MACSEC_CMD_ADD_RXSA,
2667 .doit = macsec_add_rxsa,
2668 .policy = macsec_genl_policy,
2669 .flags = GENL_ADMIN_PERM,
2670 },
2671 {
2672 .cmd = MACSEC_CMD_DEL_RXSA,
2673 .doit = macsec_del_rxsa,
2674 .policy = macsec_genl_policy,
2675 .flags = GENL_ADMIN_PERM,
2676 },
2677 {
2678 .cmd = MACSEC_CMD_UPD_RXSA,
2679 .doit = macsec_upd_rxsa,
2680 .policy = macsec_genl_policy,
2681 .flags = GENL_ADMIN_PERM,
2682 },
2683 };
2684
2685 static struct genl_family macsec_fam __ro_after_init = {
2686 .name = MACSEC_GENL_NAME,
2687 .hdrsize = 0,
2688 .version = MACSEC_GENL_VERSION,
2689 .maxattr = MACSEC_ATTR_MAX,
2690 .netnsok = true,
2691 .module = THIS_MODULE,
2692 .ops = macsec_genl_ops,
2693 .n_ops = ARRAY_SIZE(macsec_genl_ops),
2694 };
2695
2696 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2697 struct net_device *dev)
2698 {
2699 struct macsec_dev *macsec = netdev_priv(dev);
2700 struct macsec_secy *secy = &macsec->secy;
2701 struct pcpu_secy_stats *secy_stats;
2702 int ret, len;
2703
2704 /* 10.5 */
2705 if (!secy->protect_frames) {
2706 secy_stats = this_cpu_ptr(macsec->stats);
2707 u64_stats_update_begin(&secy_stats->syncp);
2708 secy_stats->stats.OutPktsUntagged++;
2709 u64_stats_update_end(&secy_stats->syncp);
2710 skb->dev = macsec->real_dev;
2711 len = skb->len;
2712 ret = dev_queue_xmit(skb);
2713 count_tx(dev, ret, len);
2714 return ret;
2715 }
2716
2717 if (!secy->operational) {
2718 kfree_skb(skb);
2719 dev->stats.tx_dropped++;
2720 return NETDEV_TX_OK;
2721 }
2722
2723 skb = macsec_encrypt(skb, dev);
2724 if (IS_ERR(skb)) {
2725 if (PTR_ERR(skb) != -EINPROGRESS)
2726 dev->stats.tx_dropped++;
2727 return NETDEV_TX_OK;
2728 }
2729
2730 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2731
2732 macsec_encrypt_finish(skb, dev);
2733 len = skb->len;
2734 ret = dev_queue_xmit(skb);
2735 count_tx(dev, ret, len);
2736 return ret;
2737 }
2738
2739 #define MACSEC_FEATURES \
2740 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2741 static struct lock_class_key macsec_netdev_addr_lock_key;
2742
2743 static int macsec_dev_init(struct net_device *dev)
2744 {
2745 struct macsec_dev *macsec = macsec_priv(dev);
2746 struct net_device *real_dev = macsec->real_dev;
2747 int err;
2748
2749 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2750 if (!dev->tstats)
2751 return -ENOMEM;
2752
2753 err = gro_cells_init(&macsec->gro_cells, dev);
2754 if (err) {
2755 free_percpu(dev->tstats);
2756 return err;
2757 }
2758
2759 dev->features = real_dev->features & MACSEC_FEATURES;
2760 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2761
2762 dev->needed_headroom = real_dev->needed_headroom +
2763 MACSEC_NEEDED_HEADROOM;
2764 dev->needed_tailroom = real_dev->needed_tailroom +
2765 MACSEC_NEEDED_TAILROOM;
2766
2767 if (is_zero_ether_addr(dev->dev_addr))
2768 eth_hw_addr_inherit(dev, real_dev);
2769 if (is_zero_ether_addr(dev->broadcast))
2770 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2771
2772 return 0;
2773 }
2774
2775 static void macsec_dev_uninit(struct net_device *dev)
2776 {
2777 struct macsec_dev *macsec = macsec_priv(dev);
2778
2779 gro_cells_destroy(&macsec->gro_cells);
2780 free_percpu(dev->tstats);
2781 }
2782
2783 static netdev_features_t macsec_fix_features(struct net_device *dev,
2784 netdev_features_t features)
2785 {
2786 struct macsec_dev *macsec = macsec_priv(dev);
2787 struct net_device *real_dev = macsec->real_dev;
2788
2789 features &= (real_dev->features & MACSEC_FEATURES) |
2790 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
2791 features |= NETIF_F_LLTX;
2792
2793 return features;
2794 }
2795
2796 static int macsec_dev_open(struct net_device *dev)
2797 {
2798 struct macsec_dev *macsec = macsec_priv(dev);
2799 struct net_device *real_dev = macsec->real_dev;
2800 int err;
2801
2802 if (!(real_dev->flags & IFF_UP))
2803 return -ENETDOWN;
2804
2805 err = dev_uc_add(real_dev, dev->dev_addr);
2806 if (err < 0)
2807 return err;
2808
2809 if (dev->flags & IFF_ALLMULTI) {
2810 err = dev_set_allmulti(real_dev, 1);
2811 if (err < 0)
2812 goto del_unicast;
2813 }
2814
2815 if (dev->flags & IFF_PROMISC) {
2816 err = dev_set_promiscuity(real_dev, 1);
2817 if (err < 0)
2818 goto clear_allmulti;
2819 }
2820
2821 if (netif_carrier_ok(real_dev))
2822 netif_carrier_on(dev);
2823
2824 return 0;
2825 clear_allmulti:
2826 if (dev->flags & IFF_ALLMULTI)
2827 dev_set_allmulti(real_dev, -1);
2828 del_unicast:
2829 dev_uc_del(real_dev, dev->dev_addr);
2830 netif_carrier_off(dev);
2831 return err;
2832 }
2833
2834 static int macsec_dev_stop(struct net_device *dev)
2835 {
2836 struct macsec_dev *macsec = macsec_priv(dev);
2837 struct net_device *real_dev = macsec->real_dev;
2838
2839 netif_carrier_off(dev);
2840
2841 dev_mc_unsync(real_dev, dev);
2842 dev_uc_unsync(real_dev, dev);
2843
2844 if (dev->flags & IFF_ALLMULTI)
2845 dev_set_allmulti(real_dev, -1);
2846
2847 if (dev->flags & IFF_PROMISC)
2848 dev_set_promiscuity(real_dev, -1);
2849
2850 dev_uc_del(real_dev, dev->dev_addr);
2851
2852 return 0;
2853 }
2854
2855 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2856 {
2857 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2858
2859 if (!(dev->flags & IFF_UP))
2860 return;
2861
2862 if (change & IFF_ALLMULTI)
2863 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2864
2865 if (change & IFF_PROMISC)
2866 dev_set_promiscuity(real_dev,
2867 dev->flags & IFF_PROMISC ? 1 : -1);
2868 }
2869
2870 static void macsec_dev_set_rx_mode(struct net_device *dev)
2871 {
2872 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2873
2874 dev_mc_sync(real_dev, dev);
2875 dev_uc_sync(real_dev, dev);
2876 }
2877
2878 static int macsec_set_mac_address(struct net_device *dev, void *p)
2879 {
2880 struct macsec_dev *macsec = macsec_priv(dev);
2881 struct net_device *real_dev = macsec->real_dev;
2882 struct sockaddr *addr = p;
2883 int err;
2884
2885 if (!is_valid_ether_addr(addr->sa_data))
2886 return -EADDRNOTAVAIL;
2887
2888 if (!(dev->flags & IFF_UP))
2889 goto out;
2890
2891 err = dev_uc_add(real_dev, addr->sa_data);
2892 if (err < 0)
2893 return err;
2894
2895 dev_uc_del(real_dev, dev->dev_addr);
2896
2897 out:
2898 ether_addr_copy(dev->dev_addr, addr->sa_data);
2899 return 0;
2900 }
2901
2902 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2903 {
2904 struct macsec_dev *macsec = macsec_priv(dev);
2905 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2906
2907 if (macsec->real_dev->mtu - extra < new_mtu)
2908 return -ERANGE;
2909
2910 dev->mtu = new_mtu;
2911
2912 return 0;
2913 }
2914
2915 static void macsec_get_stats64(struct net_device *dev,
2916 struct rtnl_link_stats64 *s)
2917 {
2918 int cpu;
2919
2920 if (!dev->tstats)
2921 return;
2922
2923 for_each_possible_cpu(cpu) {
2924 struct pcpu_sw_netstats *stats;
2925 struct pcpu_sw_netstats tmp;
2926 int start;
2927
2928 stats = per_cpu_ptr(dev->tstats, cpu);
2929 do {
2930 start = u64_stats_fetch_begin_irq(&stats->syncp);
2931 tmp.rx_packets = stats->rx_packets;
2932 tmp.rx_bytes = stats->rx_bytes;
2933 tmp.tx_packets = stats->tx_packets;
2934 tmp.tx_bytes = stats->tx_bytes;
2935 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2936
2937 s->rx_packets += tmp.rx_packets;
2938 s->rx_bytes += tmp.rx_bytes;
2939 s->tx_packets += tmp.tx_packets;
2940 s->tx_bytes += tmp.tx_bytes;
2941 }
2942
2943 s->rx_dropped = dev->stats.rx_dropped;
2944 s->tx_dropped = dev->stats.tx_dropped;
2945 }
2946
2947 static int macsec_get_iflink(const struct net_device *dev)
2948 {
2949 return macsec_priv(dev)->real_dev->ifindex;
2950 }
2951
2952
2953 static int macsec_get_nest_level(struct net_device *dev)
2954 {
2955 return macsec_priv(dev)->nest_level;
2956 }
2957
2958
2959 static const struct net_device_ops macsec_netdev_ops = {
2960 .ndo_init = macsec_dev_init,
2961 .ndo_uninit = macsec_dev_uninit,
2962 .ndo_open = macsec_dev_open,
2963 .ndo_stop = macsec_dev_stop,
2964 .ndo_fix_features = macsec_fix_features,
2965 .ndo_change_mtu = macsec_change_mtu,
2966 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2967 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2968 .ndo_set_mac_address = macsec_set_mac_address,
2969 .ndo_start_xmit = macsec_start_xmit,
2970 .ndo_get_stats64 = macsec_get_stats64,
2971 .ndo_get_iflink = macsec_get_iflink,
2972 .ndo_get_lock_subclass = macsec_get_nest_level,
2973 };
2974
2975 static const struct device_type macsec_type = {
2976 .name = "macsec",
2977 };
2978
2979 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2980 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2981 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2982 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2983 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2984 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2985 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2986 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
2987 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
2988 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
2989 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
2990 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
2991 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
2992 };
2993
2994 static void macsec_free_netdev(struct net_device *dev)
2995 {
2996 struct macsec_dev *macsec = macsec_priv(dev);
2997 struct net_device *real_dev = macsec->real_dev;
2998
2999 free_percpu(macsec->stats);
3000 free_percpu(macsec->secy.tx_sc.stats);
3001
3002 dev_put(real_dev);
3003 }
3004
3005 static void macsec_setup(struct net_device *dev)
3006 {
3007 ether_setup(dev);
3008 dev->min_mtu = 0;
3009 dev->max_mtu = ETH_MAX_MTU;
3010 dev->priv_flags |= IFF_NO_QUEUE;
3011 dev->netdev_ops = &macsec_netdev_ops;
3012 dev->needs_free_netdev = true;
3013 dev->priv_destructor = macsec_free_netdev;
3014 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3015
3016 eth_zero_addr(dev->broadcast);
3017 }
3018
3019 static void macsec_changelink_common(struct net_device *dev,
3020 struct nlattr *data[])
3021 {
3022 struct macsec_secy *secy;
3023 struct macsec_tx_sc *tx_sc;
3024
3025 secy = &macsec_priv(dev)->secy;
3026 tx_sc = &secy->tx_sc;
3027
3028 if (data[IFLA_MACSEC_ENCODING_SA]) {
3029 struct macsec_tx_sa *tx_sa;
3030
3031 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3032 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3033
3034 secy->operational = tx_sa && tx_sa->active;
3035 }
3036
3037 if (data[IFLA_MACSEC_WINDOW])
3038 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3039
3040 if (data[IFLA_MACSEC_ENCRYPT])
3041 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3042
3043 if (data[IFLA_MACSEC_PROTECT])
3044 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3045
3046 if (data[IFLA_MACSEC_INC_SCI])
3047 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3048
3049 if (data[IFLA_MACSEC_ES])
3050 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3051
3052 if (data[IFLA_MACSEC_SCB])
3053 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3054
3055 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3056 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3057
3058 if (data[IFLA_MACSEC_VALIDATION])
3059 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3060 }
3061
3062 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3063 struct nlattr *data[],
3064 struct netlink_ext_ack *extack)
3065 {
3066 if (!data)
3067 return 0;
3068
3069 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3070 data[IFLA_MACSEC_ICV_LEN] ||
3071 data[IFLA_MACSEC_SCI] ||
3072 data[IFLA_MACSEC_PORT])
3073 return -EINVAL;
3074
3075 macsec_changelink_common(dev, data);
3076
3077 return 0;
3078 }
3079
3080 static void macsec_del_dev(struct macsec_dev *macsec)
3081 {
3082 int i;
3083
3084 while (macsec->secy.rx_sc) {
3085 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3086
3087 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3088 free_rx_sc(rx_sc);
3089 }
3090
3091 for (i = 0; i < MACSEC_NUM_AN; i++) {
3092 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3093
3094 if (sa) {
3095 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3096 clear_tx_sa(sa);
3097 }
3098 }
3099 }
3100
3101 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3102 {
3103 struct macsec_dev *macsec = macsec_priv(dev);
3104 struct net_device *real_dev = macsec->real_dev;
3105
3106 unregister_netdevice_queue(dev, head);
3107 list_del_rcu(&macsec->secys);
3108 macsec_del_dev(macsec);
3109 netdev_upper_dev_unlink(real_dev, dev);
3110
3111 macsec_generation++;
3112 }
3113
3114 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3115 {
3116 struct macsec_dev *macsec = macsec_priv(dev);
3117 struct net_device *real_dev = macsec->real_dev;
3118 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3119
3120 macsec_common_dellink(dev, head);
3121
3122 if (list_empty(&rxd->secys)) {
3123 netdev_rx_handler_unregister(real_dev);
3124 kfree(rxd);
3125 }
3126 }
3127
3128 static int register_macsec_dev(struct net_device *real_dev,
3129 struct net_device *dev)
3130 {
3131 struct macsec_dev *macsec = macsec_priv(dev);
3132 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3133
3134 if (!rxd) {
3135 int err;
3136
3137 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3138 if (!rxd)
3139 return -ENOMEM;
3140
3141 INIT_LIST_HEAD(&rxd->secys);
3142
3143 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3144 rxd);
3145 if (err < 0) {
3146 kfree(rxd);
3147 return err;
3148 }
3149 }
3150
3151 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3152 return 0;
3153 }
3154
3155 static bool sci_exists(struct net_device *dev, sci_t sci)
3156 {
3157 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3158 struct macsec_dev *macsec;
3159
3160 list_for_each_entry(macsec, &rxd->secys, secys) {
3161 if (macsec->secy.sci == sci)
3162 return true;
3163 }
3164
3165 return false;
3166 }
3167
3168 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3169 {
3170 return make_sci(dev->dev_addr, port);
3171 }
3172
3173 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3174 {
3175 struct macsec_dev *macsec = macsec_priv(dev);
3176 struct macsec_secy *secy = &macsec->secy;
3177
3178 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3179 if (!macsec->stats)
3180 return -ENOMEM;
3181
3182 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3183 if (!secy->tx_sc.stats) {
3184 free_percpu(macsec->stats);
3185 return -ENOMEM;
3186 }
3187
3188 if (sci == MACSEC_UNDEF_SCI)
3189 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3190
3191 secy->netdev = dev;
3192 secy->operational = true;
3193 secy->key_len = DEFAULT_SAK_LEN;
3194 secy->icv_len = icv_len;
3195 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3196 secy->protect_frames = true;
3197 secy->replay_protect = false;
3198
3199 secy->sci = sci;
3200 secy->tx_sc.active = true;
3201 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3202 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3203 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3204 secy->tx_sc.end_station = false;
3205 secy->tx_sc.scb = false;
3206
3207 return 0;
3208 }
3209
3210 static int macsec_newlink(struct net *net, struct net_device *dev,
3211 struct nlattr *tb[], struct nlattr *data[],
3212 struct netlink_ext_ack *extack)
3213 {
3214 struct macsec_dev *macsec = macsec_priv(dev);
3215 struct net_device *real_dev;
3216 int err;
3217 sci_t sci;
3218 u8 icv_len = DEFAULT_ICV_LEN;
3219 rx_handler_func_t *rx_handler;
3220
3221 if (!tb[IFLA_LINK])
3222 return -EINVAL;
3223 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3224 if (!real_dev)
3225 return -ENODEV;
3226
3227 dev->priv_flags |= IFF_MACSEC;
3228
3229 macsec->real_dev = real_dev;
3230
3231 if (data && data[IFLA_MACSEC_ICV_LEN])
3232 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3233 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3234
3235 rx_handler = rtnl_dereference(real_dev->rx_handler);
3236 if (rx_handler && rx_handler != macsec_handle_frame)
3237 return -EBUSY;
3238
3239 err = register_netdevice(dev);
3240 if (err < 0)
3241 return err;
3242
3243 dev_hold(real_dev);
3244
3245 macsec->nest_level = dev_get_nest_level(real_dev) + 1;
3246 netdev_lockdep_set_classes(dev);
3247 lockdep_set_class_and_subclass(&dev->addr_list_lock,
3248 &macsec_netdev_addr_lock_key,
3249 macsec_get_nest_level(dev));
3250
3251 err = netdev_upper_dev_link(real_dev, dev, extack);
3252 if (err < 0)
3253 goto unregister;
3254
3255 /* need to be already registered so that ->init has run and
3256 * the MAC addr is set
3257 */
3258 if (data && data[IFLA_MACSEC_SCI])
3259 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3260 else if (data && data[IFLA_MACSEC_PORT])
3261 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3262 else
3263 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3264
3265 if (rx_handler && sci_exists(real_dev, sci)) {
3266 err = -EBUSY;
3267 goto unlink;
3268 }
3269
3270 err = macsec_add_dev(dev, sci, icv_len);
3271 if (err)
3272 goto unlink;
3273
3274 if (data)
3275 macsec_changelink_common(dev, data);
3276
3277 err = register_macsec_dev(real_dev, dev);
3278 if (err < 0)
3279 goto del_dev;
3280
3281 macsec_generation++;
3282
3283 return 0;
3284
3285 del_dev:
3286 macsec_del_dev(macsec);
3287 unlink:
3288 netdev_upper_dev_unlink(real_dev, dev);
3289 unregister:
3290 unregister_netdevice(dev);
3291 return err;
3292 }
3293
3294 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
3295 struct netlink_ext_ack *extack)
3296 {
3297 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3298 u8 icv_len = DEFAULT_ICV_LEN;
3299 int flag;
3300 bool es, scb, sci;
3301
3302 if (!data)
3303 return 0;
3304
3305 if (data[IFLA_MACSEC_CIPHER_SUITE])
3306 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3307
3308 if (data[IFLA_MACSEC_ICV_LEN]) {
3309 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3310 if (icv_len != DEFAULT_ICV_LEN) {
3311 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
3312 struct crypto_aead *dummy_tfm;
3313
3314 dummy_tfm = macsec_alloc_tfm(dummy_key,
3315 DEFAULT_SAK_LEN,
3316 icv_len);
3317 if (IS_ERR(dummy_tfm))
3318 return PTR_ERR(dummy_tfm);
3319 crypto_free_aead(dummy_tfm);
3320 }
3321 }
3322
3323 switch (csid) {
3324 case MACSEC_DEFAULT_CIPHER_ID:
3325 case MACSEC_DEFAULT_CIPHER_ALT:
3326 if (icv_len < MACSEC_MIN_ICV_LEN ||
3327 icv_len > MACSEC_STD_ICV_LEN)
3328 return -EINVAL;
3329 break;
3330 default:
3331 return -EINVAL;
3332 }
3333
3334 if (data[IFLA_MACSEC_ENCODING_SA]) {
3335 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3336 return -EINVAL;
3337 }
3338
3339 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3340 flag < IFLA_MACSEC_VALIDATION;
3341 flag++) {
3342 if (data[flag]) {
3343 if (nla_get_u8(data[flag]) > 1)
3344 return -EINVAL;
3345 }
3346 }
3347
3348 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3349 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3350 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3351
3352 if ((sci && (scb || es)) || (scb && es))
3353 return -EINVAL;
3354
3355 if (data[IFLA_MACSEC_VALIDATION] &&
3356 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3357 return -EINVAL;
3358
3359 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3360 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3361 !data[IFLA_MACSEC_WINDOW])
3362 return -EINVAL;
3363
3364 return 0;
3365 }
3366
3367 static struct net *macsec_get_link_net(const struct net_device *dev)
3368 {
3369 return dev_net(macsec_priv(dev)->real_dev);
3370 }
3371
3372 static size_t macsec_get_size(const struct net_device *dev)
3373 {
3374 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
3375 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
3376 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
3377 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
3378 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
3379 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
3380 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
3381 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
3382 nla_total_size(1) + /* IFLA_MACSEC_ES */
3383 nla_total_size(1) + /* IFLA_MACSEC_SCB */
3384 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
3385 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
3386 0;
3387 }
3388
3389 static int macsec_fill_info(struct sk_buff *skb,
3390 const struct net_device *dev)
3391 {
3392 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3393 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3394
3395 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
3396 IFLA_MACSEC_PAD) ||
3397 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3398 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
3399 MACSEC_DEFAULT_CIPHER_ID, IFLA_MACSEC_PAD) ||
3400 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3401 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3402 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3403 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3404 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3405 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3406 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3407 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3408 0)
3409 goto nla_put_failure;
3410
3411 if (secy->replay_protect) {
3412 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3413 goto nla_put_failure;
3414 }
3415
3416 return 0;
3417
3418 nla_put_failure:
3419 return -EMSGSIZE;
3420 }
3421
3422 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3423 .kind = "macsec",
3424 .priv_size = sizeof(struct macsec_dev),
3425 .maxtype = IFLA_MACSEC_MAX,
3426 .policy = macsec_rtnl_policy,
3427 .setup = macsec_setup,
3428 .validate = macsec_validate_attr,
3429 .newlink = macsec_newlink,
3430 .changelink = macsec_changelink,
3431 .dellink = macsec_dellink,
3432 .get_size = macsec_get_size,
3433 .fill_info = macsec_fill_info,
3434 .get_link_net = macsec_get_link_net,
3435 };
3436
3437 static bool is_macsec_master(struct net_device *dev)
3438 {
3439 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3440 }
3441
3442 static int macsec_notify(struct notifier_block *this, unsigned long event,
3443 void *ptr)
3444 {
3445 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3446 LIST_HEAD(head);
3447
3448 if (!is_macsec_master(real_dev))
3449 return NOTIFY_DONE;
3450
3451 switch (event) {
3452 case NETDEV_UNREGISTER: {
3453 struct macsec_dev *m, *n;
3454 struct macsec_rxh_data *rxd;
3455
3456 rxd = macsec_data_rtnl(real_dev);
3457 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3458 macsec_common_dellink(m->secy.netdev, &head);
3459 }
3460
3461 netdev_rx_handler_unregister(real_dev);
3462 kfree(rxd);
3463
3464 unregister_netdevice_many(&head);
3465 break;
3466 }
3467 case NETDEV_CHANGEMTU: {
3468 struct macsec_dev *m;
3469 struct macsec_rxh_data *rxd;
3470
3471 rxd = macsec_data_rtnl(real_dev);
3472 list_for_each_entry(m, &rxd->secys, secys) {
3473 struct net_device *dev = m->secy.netdev;
3474 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3475 macsec_extra_len(true));
3476
3477 if (dev->mtu > mtu)
3478 dev_set_mtu(dev, mtu);
3479 }
3480 }
3481 }
3482
3483 return NOTIFY_OK;
3484 }
3485
3486 static struct notifier_block macsec_notifier = {
3487 .notifier_call = macsec_notify,
3488 };
3489
3490 static int __init macsec_init(void)
3491 {
3492 int err;
3493
3494 pr_info("MACsec IEEE 802.1AE\n");
3495 err = register_netdevice_notifier(&macsec_notifier);
3496 if (err)
3497 return err;
3498
3499 err = rtnl_link_register(&macsec_link_ops);
3500 if (err)
3501 goto notifier;
3502
3503 err = genl_register_family(&macsec_fam);
3504 if (err)
3505 goto rtnl;
3506
3507 return 0;
3508
3509 rtnl:
3510 rtnl_link_unregister(&macsec_link_ops);
3511 notifier:
3512 unregister_netdevice_notifier(&macsec_notifier);
3513 return err;
3514 }
3515
3516 static void __exit macsec_exit(void)
3517 {
3518 genl_unregister_family(&macsec_fam);
3519 rtnl_link_unregister(&macsec_link_ops);
3520 unregister_netdevice_notifier(&macsec_notifier);
3521 rcu_barrier();
3522 }
3523
3524 module_init(macsec_init);
3525 module_exit(macsec_exit);
3526
3527 MODULE_ALIAS_RTNL_LINK("macsec");
3528 MODULE_ALIAS_GENL_FAMILY("macsec");
3529
3530 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3531 MODULE_LICENSE("GPL v2");
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