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Merge branch 'upstream-acpi-fixes' into WIP.x86/pti.base
[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 <net/genetlink.h>
20 #include <net/sock.h>
21 #include <net/gro_cells.h>
22
23 #include <uapi/linux/if_macsec.h>
24
25 typedef u64 __bitwise sci_t;
26
27 #define MACSEC_SCI_LEN 8
28
29 /* SecTAG length = macsec_eth_header without the optional SCI */
30 #define MACSEC_TAG_LEN 6
31
32 struct macsec_eth_header {
33 struct ethhdr eth;
34 /* SecTAG */
35 u8 tci_an;
36 #if defined(__LITTLE_ENDIAN_BITFIELD)
37 u8 short_length:6,
38 unused:2;
39 #elif defined(__BIG_ENDIAN_BITFIELD)
40 u8 unused:2,
41 short_length:6;
42 #else
43 #error "Please fix <asm/byteorder.h>"
44 #endif
45 __be32 packet_number;
46 u8 secure_channel_id[8]; /* optional */
47 } __packed;
48
49 #define MACSEC_TCI_VERSION 0x80
50 #define MACSEC_TCI_ES 0x40 /* end station */
51 #define MACSEC_TCI_SC 0x20 /* SCI present */
52 #define MACSEC_TCI_SCB 0x10 /* epon */
53 #define MACSEC_TCI_E 0x08 /* encryption */
54 #define MACSEC_TCI_C 0x04 /* changed text */
55 #define MACSEC_AN_MASK 0x03 /* association number */
56 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
57
58 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
59 #define MIN_NON_SHORT_LEN 48
60
61 #define GCM_AES_IV_LEN 12
62 #define DEFAULT_ICV_LEN 16
63
64 #define MACSEC_NUM_AN 4 /* 2 bits for the association number */
65
66 #define for_each_rxsc(secy, sc) \
67 for (sc = rcu_dereference_bh(secy->rx_sc); \
68 sc; \
69 sc = rcu_dereference_bh(sc->next))
70 #define for_each_rxsc_rtnl(secy, sc) \
71 for (sc = rtnl_dereference(secy->rx_sc); \
72 sc; \
73 sc = rtnl_dereference(sc->next))
74
75 struct gcm_iv {
76 union {
77 u8 secure_channel_id[8];
78 sci_t sci;
79 };
80 __be32 pn;
81 };
82
83 /**
84 * struct macsec_key - SA key
85 * @id: user-provided key identifier
86 * @tfm: crypto struct, key storage
87 */
88 struct macsec_key {
89 u8 id[MACSEC_KEYID_LEN];
90 struct crypto_aead *tfm;
91 };
92
93 struct macsec_rx_sc_stats {
94 __u64 InOctetsValidated;
95 __u64 InOctetsDecrypted;
96 __u64 InPktsUnchecked;
97 __u64 InPktsDelayed;
98 __u64 InPktsOK;
99 __u64 InPktsInvalid;
100 __u64 InPktsLate;
101 __u64 InPktsNotValid;
102 __u64 InPktsNotUsingSA;
103 __u64 InPktsUnusedSA;
104 };
105
106 struct macsec_rx_sa_stats {
107 __u32 InPktsOK;
108 __u32 InPktsInvalid;
109 __u32 InPktsNotValid;
110 __u32 InPktsNotUsingSA;
111 __u32 InPktsUnusedSA;
112 };
113
114 struct macsec_tx_sa_stats {
115 __u32 OutPktsProtected;
116 __u32 OutPktsEncrypted;
117 };
118
119 struct macsec_tx_sc_stats {
120 __u64 OutPktsProtected;
121 __u64 OutPktsEncrypted;
122 __u64 OutOctetsProtected;
123 __u64 OutOctetsEncrypted;
124 };
125
126 struct macsec_dev_stats {
127 __u64 OutPktsUntagged;
128 __u64 InPktsUntagged;
129 __u64 OutPktsTooLong;
130 __u64 InPktsNoTag;
131 __u64 InPktsBadTag;
132 __u64 InPktsUnknownSCI;
133 __u64 InPktsNoSCI;
134 __u64 InPktsOverrun;
135 };
136
137 /**
138 * struct macsec_rx_sa - receive secure association
139 * @active:
140 * @next_pn: packet number expected for the next packet
141 * @lock: protects next_pn manipulations
142 * @key: key structure
143 * @stats: per-SA stats
144 */
145 struct macsec_rx_sa {
146 struct macsec_key key;
147 spinlock_t lock;
148 u32 next_pn;
149 atomic_t refcnt;
150 bool active;
151 struct macsec_rx_sa_stats __percpu *stats;
152 struct macsec_rx_sc *sc;
153 struct rcu_head rcu;
154 };
155
156 struct pcpu_rx_sc_stats {
157 struct macsec_rx_sc_stats stats;
158 struct u64_stats_sync syncp;
159 };
160
161 /**
162 * struct macsec_rx_sc - receive secure channel
163 * @sci: secure channel identifier for this SC
164 * @active: channel is active
165 * @sa: array of secure associations
166 * @stats: per-SC stats
167 */
168 struct macsec_rx_sc {
169 struct macsec_rx_sc __rcu *next;
170 sci_t sci;
171 bool active;
172 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN];
173 struct pcpu_rx_sc_stats __percpu *stats;
174 atomic_t refcnt;
175 struct rcu_head rcu_head;
176 };
177
178 /**
179 * struct macsec_tx_sa - transmit secure association
180 * @active:
181 * @next_pn: packet number to use for the next packet
182 * @lock: protects next_pn manipulations
183 * @key: key structure
184 * @stats: per-SA stats
185 */
186 struct macsec_tx_sa {
187 struct macsec_key key;
188 spinlock_t lock;
189 u32 next_pn;
190 atomic_t refcnt;
191 bool active;
192 struct macsec_tx_sa_stats __percpu *stats;
193 struct rcu_head rcu;
194 };
195
196 struct pcpu_tx_sc_stats {
197 struct macsec_tx_sc_stats stats;
198 struct u64_stats_sync syncp;
199 };
200
201 /**
202 * struct macsec_tx_sc - transmit secure channel
203 * @active:
204 * @encoding_sa: association number of the SA currently in use
205 * @encrypt: encrypt packets on transmit, or authenticate only
206 * @send_sci: always include the SCI in the SecTAG
207 * @end_station:
208 * @scb: single copy broadcast flag
209 * @sa: array of secure associations
210 * @stats: stats for this TXSC
211 */
212 struct macsec_tx_sc {
213 bool active;
214 u8 encoding_sa;
215 bool encrypt;
216 bool send_sci;
217 bool end_station;
218 bool scb;
219 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN];
220 struct pcpu_tx_sc_stats __percpu *stats;
221 };
222
223 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
224
225 /**
226 * struct macsec_secy - MACsec Security Entity
227 * @netdev: netdevice for this SecY
228 * @n_rx_sc: number of receive secure channels configured on this SecY
229 * @sci: secure channel identifier used for tx
230 * @key_len: length of keys used by the cipher suite
231 * @icv_len: length of ICV used by the cipher suite
232 * @validate_frames: validation mode
233 * @operational: MAC_Operational flag
234 * @protect_frames: enable protection for this SecY
235 * @replay_protect: enable packet number checks on receive
236 * @replay_window: size of the replay window
237 * @tx_sc: transmit secure channel
238 * @rx_sc: linked list of receive secure channels
239 */
240 struct macsec_secy {
241 struct net_device *netdev;
242 unsigned int n_rx_sc;
243 sci_t sci;
244 u16 key_len;
245 u16 icv_len;
246 enum macsec_validation_type validate_frames;
247 bool operational;
248 bool protect_frames;
249 bool replay_protect;
250 u32 replay_window;
251 struct macsec_tx_sc tx_sc;
252 struct macsec_rx_sc __rcu *rx_sc;
253 };
254
255 struct pcpu_secy_stats {
256 struct macsec_dev_stats stats;
257 struct u64_stats_sync syncp;
258 };
259
260 /**
261 * struct macsec_dev - private data
262 * @secy: SecY config
263 * @real_dev: pointer to underlying netdevice
264 * @stats: MACsec device stats
265 * @secys: linked list of SecY's on the underlying device
266 */
267 struct macsec_dev {
268 struct macsec_secy secy;
269 struct net_device *real_dev;
270 struct pcpu_secy_stats __percpu *stats;
271 struct list_head secys;
272 struct gro_cells gro_cells;
273 unsigned int nest_level;
274 };
275
276 /**
277 * struct macsec_rxh_data - rx_handler private argument
278 * @secys: linked list of SecY's on this underlying device
279 */
280 struct macsec_rxh_data {
281 struct list_head secys;
282 };
283
284 static struct macsec_dev *macsec_priv(const struct net_device *dev)
285 {
286 return (struct macsec_dev *)netdev_priv(dev);
287 }
288
289 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
290 {
291 return rcu_dereference_bh(dev->rx_handler_data);
292 }
293
294 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
295 {
296 return rtnl_dereference(dev->rx_handler_data);
297 }
298
299 struct macsec_cb {
300 struct aead_request *req;
301 union {
302 struct macsec_tx_sa *tx_sa;
303 struct macsec_rx_sa *rx_sa;
304 };
305 u8 assoc_num;
306 bool valid;
307 bool has_sci;
308 };
309
310 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
311 {
312 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
313
314 if (!sa || !sa->active)
315 return NULL;
316
317 if (!atomic_inc_not_zero(&sa->refcnt))
318 return NULL;
319
320 return sa;
321 }
322
323 static void free_rx_sc_rcu(struct rcu_head *head)
324 {
325 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
326
327 free_percpu(rx_sc->stats);
328 kfree(rx_sc);
329 }
330
331 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
332 {
333 return atomic_inc_not_zero(&sc->refcnt) ? sc : NULL;
334 }
335
336 static void macsec_rxsc_put(struct macsec_rx_sc *sc)
337 {
338 if (atomic_dec_and_test(&sc->refcnt))
339 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
340 }
341
342 static void free_rxsa(struct rcu_head *head)
343 {
344 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
345
346 crypto_free_aead(sa->key.tfm);
347 free_percpu(sa->stats);
348 kfree(sa);
349 }
350
351 static void macsec_rxsa_put(struct macsec_rx_sa *sa)
352 {
353 if (atomic_dec_and_test(&sa->refcnt))
354 call_rcu(&sa->rcu, free_rxsa);
355 }
356
357 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
358 {
359 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
360
361 if (!sa || !sa->active)
362 return NULL;
363
364 if (!atomic_inc_not_zero(&sa->refcnt))
365 return NULL;
366
367 return sa;
368 }
369
370 static void free_txsa(struct rcu_head *head)
371 {
372 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
373
374 crypto_free_aead(sa->key.tfm);
375 free_percpu(sa->stats);
376 kfree(sa);
377 }
378
379 static void macsec_txsa_put(struct macsec_tx_sa *sa)
380 {
381 if (atomic_dec_and_test(&sa->refcnt))
382 call_rcu(&sa->rcu, free_txsa);
383 }
384
385 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
386 {
387 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
388 return (struct macsec_cb *)skb->cb;
389 }
390
391 #define MACSEC_PORT_ES (htons(0x0001))
392 #define MACSEC_PORT_SCB (0x0000)
393 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
394
395 #define DEFAULT_SAK_LEN 16
396 #define DEFAULT_SEND_SCI true
397 #define DEFAULT_ENCRYPT false
398 #define DEFAULT_ENCODING_SA 0
399
400 static bool send_sci(const struct macsec_secy *secy)
401 {
402 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
403
404 return tx_sc->send_sci ||
405 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
406 }
407
408 static sci_t make_sci(u8 *addr, __be16 port)
409 {
410 sci_t sci;
411
412 memcpy(&sci, addr, ETH_ALEN);
413 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
414
415 return sci;
416 }
417
418 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
419 {
420 sci_t sci;
421
422 if (sci_present)
423 memcpy(&sci, hdr->secure_channel_id,
424 sizeof(hdr->secure_channel_id));
425 else
426 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
427
428 return sci;
429 }
430
431 static unsigned int macsec_sectag_len(bool sci_present)
432 {
433 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
434 }
435
436 static unsigned int macsec_hdr_len(bool sci_present)
437 {
438 return macsec_sectag_len(sci_present) + ETH_HLEN;
439 }
440
441 static unsigned int macsec_extra_len(bool sci_present)
442 {
443 return macsec_sectag_len(sci_present) + sizeof(__be16);
444 }
445
446 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
447 static void macsec_fill_sectag(struct macsec_eth_header *h,
448 const struct macsec_secy *secy, u32 pn,
449 bool sci_present)
450 {
451 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
452
453 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
454 h->eth.h_proto = htons(ETH_P_MACSEC);
455
456 if (sci_present) {
457 h->tci_an |= MACSEC_TCI_SC;
458 memcpy(&h->secure_channel_id, &secy->sci,
459 sizeof(h->secure_channel_id));
460 } else {
461 if (tx_sc->end_station)
462 h->tci_an |= MACSEC_TCI_ES;
463 if (tx_sc->scb)
464 h->tci_an |= MACSEC_TCI_SCB;
465 }
466
467 h->packet_number = htonl(pn);
468
469 /* with GCM, C/E clear for !encrypt, both set for encrypt */
470 if (tx_sc->encrypt)
471 h->tci_an |= MACSEC_TCI_CONFID;
472 else if (secy->icv_len != DEFAULT_ICV_LEN)
473 h->tci_an |= MACSEC_TCI_C;
474
475 h->tci_an |= tx_sc->encoding_sa;
476 }
477
478 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
479 {
480 if (data_len < MIN_NON_SHORT_LEN)
481 h->short_length = data_len;
482 }
483
484 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
485 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
486 {
487 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
488 int len = skb->len - 2 * ETH_ALEN;
489 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
490
491 /* a) It comprises at least 17 octets */
492 if (skb->len <= 16)
493 return false;
494
495 /* b) MACsec EtherType: already checked */
496
497 /* c) V bit is clear */
498 if (h->tci_an & MACSEC_TCI_VERSION)
499 return false;
500
501 /* d) ES or SCB => !SC */
502 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
503 (h->tci_an & MACSEC_TCI_SC))
504 return false;
505
506 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
507 if (h->unused)
508 return false;
509
510 /* rx.pn != 0 (figure 10-5) */
511 if (!h->packet_number)
512 return false;
513
514 /* length check, f) g) h) i) */
515 if (h->short_length)
516 return len == extra_len + h->short_length;
517 return len >= extra_len + MIN_NON_SHORT_LEN;
518 }
519
520 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
521 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
522
523 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
524 {
525 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
526
527 gcm_iv->sci = sci;
528 gcm_iv->pn = htonl(pn);
529 }
530
531 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
532 {
533 return (struct macsec_eth_header *)skb_mac_header(skb);
534 }
535
536 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
537 {
538 u32 pn;
539
540 spin_lock_bh(&tx_sa->lock);
541 pn = tx_sa->next_pn;
542
543 tx_sa->next_pn++;
544 if (tx_sa->next_pn == 0) {
545 pr_debug("PN wrapped, transitioning to !oper\n");
546 tx_sa->active = false;
547 if (secy->protect_frames)
548 secy->operational = false;
549 }
550 spin_unlock_bh(&tx_sa->lock);
551
552 return pn;
553 }
554
555 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
556 {
557 struct macsec_dev *macsec = netdev_priv(dev);
558
559 skb->dev = macsec->real_dev;
560 skb_reset_mac_header(skb);
561 skb->protocol = eth_hdr(skb)->h_proto;
562 }
563
564 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
565 struct macsec_tx_sa *tx_sa)
566 {
567 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
568
569 u64_stats_update_begin(&txsc_stats->syncp);
570 if (tx_sc->encrypt) {
571 txsc_stats->stats.OutOctetsEncrypted += skb->len;
572 txsc_stats->stats.OutPktsEncrypted++;
573 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
574 } else {
575 txsc_stats->stats.OutOctetsProtected += skb->len;
576 txsc_stats->stats.OutPktsProtected++;
577 this_cpu_inc(tx_sa->stats->OutPktsProtected);
578 }
579 u64_stats_update_end(&txsc_stats->syncp);
580 }
581
582 static void count_tx(struct net_device *dev, int ret, int len)
583 {
584 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
585 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
586
587 u64_stats_update_begin(&stats->syncp);
588 stats->tx_packets++;
589 stats->tx_bytes += len;
590 u64_stats_update_end(&stats->syncp);
591 }
592 }
593
594 static void macsec_encrypt_done(struct crypto_async_request *base, int err)
595 {
596 struct sk_buff *skb = base->data;
597 struct net_device *dev = skb->dev;
598 struct macsec_dev *macsec = macsec_priv(dev);
599 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
600 int len, ret;
601
602 aead_request_free(macsec_skb_cb(skb)->req);
603
604 rcu_read_lock_bh();
605 macsec_encrypt_finish(skb, dev);
606 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
607 len = skb->len;
608 ret = dev_queue_xmit(skb);
609 count_tx(dev, ret, len);
610 rcu_read_unlock_bh();
611
612 macsec_txsa_put(sa);
613 dev_put(dev);
614 }
615
616 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
617 unsigned char **iv,
618 struct scatterlist **sg,
619 int num_frags)
620 {
621 size_t size, iv_offset, sg_offset;
622 struct aead_request *req;
623 void *tmp;
624
625 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
626 iv_offset = size;
627 size += GCM_AES_IV_LEN;
628
629 size = ALIGN(size, __alignof__(struct scatterlist));
630 sg_offset = size;
631 size += sizeof(struct scatterlist) * num_frags;
632
633 tmp = kmalloc(size, GFP_ATOMIC);
634 if (!tmp)
635 return NULL;
636
637 *iv = (unsigned char *)(tmp + iv_offset);
638 *sg = (struct scatterlist *)(tmp + sg_offset);
639 req = tmp;
640
641 aead_request_set_tfm(req, tfm);
642
643 return req;
644 }
645
646 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
647 struct net_device *dev)
648 {
649 int ret;
650 struct scatterlist *sg;
651 struct sk_buff *trailer;
652 unsigned char *iv;
653 struct ethhdr *eth;
654 struct macsec_eth_header *hh;
655 size_t unprotected_len;
656 struct aead_request *req;
657 struct macsec_secy *secy;
658 struct macsec_tx_sc *tx_sc;
659 struct macsec_tx_sa *tx_sa;
660 struct macsec_dev *macsec = macsec_priv(dev);
661 bool sci_present;
662 u32 pn;
663
664 secy = &macsec->secy;
665 tx_sc = &secy->tx_sc;
666
667 /* 10.5.1 TX SA assignment */
668 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
669 if (!tx_sa) {
670 secy->operational = false;
671 kfree_skb(skb);
672 return ERR_PTR(-EINVAL);
673 }
674
675 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
676 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
677 struct sk_buff *nskb = skb_copy_expand(skb,
678 MACSEC_NEEDED_HEADROOM,
679 MACSEC_NEEDED_TAILROOM,
680 GFP_ATOMIC);
681 if (likely(nskb)) {
682 consume_skb(skb);
683 skb = nskb;
684 } else {
685 macsec_txsa_put(tx_sa);
686 kfree_skb(skb);
687 return ERR_PTR(-ENOMEM);
688 }
689 } else {
690 skb = skb_unshare(skb, GFP_ATOMIC);
691 if (!skb) {
692 macsec_txsa_put(tx_sa);
693 return ERR_PTR(-ENOMEM);
694 }
695 }
696
697 unprotected_len = skb->len;
698 eth = eth_hdr(skb);
699 sci_present = send_sci(secy);
700 hh = skb_push(skb, macsec_extra_len(sci_present));
701 memmove(hh, eth, 2 * ETH_ALEN);
702
703 pn = tx_sa_update_pn(tx_sa, secy);
704 if (pn == 0) {
705 macsec_txsa_put(tx_sa);
706 kfree_skb(skb);
707 return ERR_PTR(-ENOLINK);
708 }
709 macsec_fill_sectag(hh, secy, pn, sci_present);
710 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
711
712 skb_put(skb, secy->icv_len);
713
714 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
715 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
716
717 u64_stats_update_begin(&secy_stats->syncp);
718 secy_stats->stats.OutPktsTooLong++;
719 u64_stats_update_end(&secy_stats->syncp);
720
721 macsec_txsa_put(tx_sa);
722 kfree_skb(skb);
723 return ERR_PTR(-EINVAL);
724 }
725
726 ret = skb_cow_data(skb, 0, &trailer);
727 if (unlikely(ret < 0)) {
728 macsec_txsa_put(tx_sa);
729 kfree_skb(skb);
730 return ERR_PTR(ret);
731 }
732
733 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
734 if (!req) {
735 macsec_txsa_put(tx_sa);
736 kfree_skb(skb);
737 return ERR_PTR(-ENOMEM);
738 }
739
740 macsec_fill_iv(iv, secy->sci, pn);
741
742 sg_init_table(sg, ret);
743 ret = skb_to_sgvec(skb, sg, 0, skb->len);
744 if (unlikely(ret < 0)) {
745 aead_request_free(req);
746 macsec_txsa_put(tx_sa);
747 kfree_skb(skb);
748 return ERR_PTR(ret);
749 }
750
751 if (tx_sc->encrypt) {
752 int len = skb->len - macsec_hdr_len(sci_present) -
753 secy->icv_len;
754 aead_request_set_crypt(req, sg, sg, len, iv);
755 aead_request_set_ad(req, macsec_hdr_len(sci_present));
756 } else {
757 aead_request_set_crypt(req, sg, sg, 0, iv);
758 aead_request_set_ad(req, skb->len - secy->icv_len);
759 }
760
761 macsec_skb_cb(skb)->req = req;
762 macsec_skb_cb(skb)->tx_sa = tx_sa;
763 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
764
765 dev_hold(skb->dev);
766 ret = crypto_aead_encrypt(req);
767 if (ret == -EINPROGRESS) {
768 return ERR_PTR(ret);
769 } else if (ret != 0) {
770 dev_put(skb->dev);
771 kfree_skb(skb);
772 aead_request_free(req);
773 macsec_txsa_put(tx_sa);
774 return ERR_PTR(-EINVAL);
775 }
776
777 dev_put(skb->dev);
778 aead_request_free(req);
779 macsec_txsa_put(tx_sa);
780
781 return skb;
782 }
783
784 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
785 {
786 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
787 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
788 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
789 u32 lowest_pn = 0;
790
791 spin_lock(&rx_sa->lock);
792 if (rx_sa->next_pn >= secy->replay_window)
793 lowest_pn = rx_sa->next_pn - secy->replay_window;
794
795 /* Now perform replay protection check again
796 * (see IEEE 802.1AE-2006 figure 10-5)
797 */
798 if (secy->replay_protect && pn < lowest_pn) {
799 spin_unlock(&rx_sa->lock);
800 u64_stats_update_begin(&rxsc_stats->syncp);
801 rxsc_stats->stats.InPktsLate++;
802 u64_stats_update_end(&rxsc_stats->syncp);
803 return false;
804 }
805
806 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
807 u64_stats_update_begin(&rxsc_stats->syncp);
808 if (hdr->tci_an & MACSEC_TCI_E)
809 rxsc_stats->stats.InOctetsDecrypted += skb->len;
810 else
811 rxsc_stats->stats.InOctetsValidated += skb->len;
812 u64_stats_update_end(&rxsc_stats->syncp);
813 }
814
815 if (!macsec_skb_cb(skb)->valid) {
816 spin_unlock(&rx_sa->lock);
817
818 /* 10.6.5 */
819 if (hdr->tci_an & MACSEC_TCI_C ||
820 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
821 u64_stats_update_begin(&rxsc_stats->syncp);
822 rxsc_stats->stats.InPktsNotValid++;
823 u64_stats_update_end(&rxsc_stats->syncp);
824 return false;
825 }
826
827 u64_stats_update_begin(&rxsc_stats->syncp);
828 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
829 rxsc_stats->stats.InPktsInvalid++;
830 this_cpu_inc(rx_sa->stats->InPktsInvalid);
831 } else if (pn < lowest_pn) {
832 rxsc_stats->stats.InPktsDelayed++;
833 } else {
834 rxsc_stats->stats.InPktsUnchecked++;
835 }
836 u64_stats_update_end(&rxsc_stats->syncp);
837 } else {
838 u64_stats_update_begin(&rxsc_stats->syncp);
839 if (pn < lowest_pn) {
840 rxsc_stats->stats.InPktsDelayed++;
841 } else {
842 rxsc_stats->stats.InPktsOK++;
843 this_cpu_inc(rx_sa->stats->InPktsOK);
844 }
845 u64_stats_update_end(&rxsc_stats->syncp);
846
847 if (pn >= rx_sa->next_pn)
848 rx_sa->next_pn = pn + 1;
849 spin_unlock(&rx_sa->lock);
850 }
851
852 return true;
853 }
854
855 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
856 {
857 skb->pkt_type = PACKET_HOST;
858 skb->protocol = eth_type_trans(skb, dev);
859
860 skb_reset_network_header(skb);
861 if (!skb_transport_header_was_set(skb))
862 skb_reset_transport_header(skb);
863 skb_reset_mac_len(skb);
864 }
865
866 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
867 {
868 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
869 skb_pull(skb, hdr_len);
870 pskb_trim_unique(skb, skb->len - icv_len);
871 }
872
873 static void count_rx(struct net_device *dev, int len)
874 {
875 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
876
877 u64_stats_update_begin(&stats->syncp);
878 stats->rx_packets++;
879 stats->rx_bytes += len;
880 u64_stats_update_end(&stats->syncp);
881 }
882
883 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
884 {
885 struct sk_buff *skb = base->data;
886 struct net_device *dev = skb->dev;
887 struct macsec_dev *macsec = macsec_priv(dev);
888 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
889 struct macsec_rx_sc *rx_sc = rx_sa->sc;
890 int len;
891 u32 pn;
892
893 aead_request_free(macsec_skb_cb(skb)->req);
894
895 if (!err)
896 macsec_skb_cb(skb)->valid = true;
897
898 rcu_read_lock_bh();
899 pn = ntohl(macsec_ethhdr(skb)->packet_number);
900 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
901 rcu_read_unlock_bh();
902 kfree_skb(skb);
903 goto out;
904 }
905
906 macsec_finalize_skb(skb, macsec->secy.icv_len,
907 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
908 macsec_reset_skb(skb, macsec->secy.netdev);
909
910 len = skb->len;
911 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
912 count_rx(dev, len);
913
914 rcu_read_unlock_bh();
915
916 out:
917 macsec_rxsa_put(rx_sa);
918 macsec_rxsc_put(rx_sc);
919 dev_put(dev);
920 }
921
922 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
923 struct net_device *dev,
924 struct macsec_rx_sa *rx_sa,
925 sci_t sci,
926 struct macsec_secy *secy)
927 {
928 int ret;
929 struct scatterlist *sg;
930 struct sk_buff *trailer;
931 unsigned char *iv;
932 struct aead_request *req;
933 struct macsec_eth_header *hdr;
934 u16 icv_len = secy->icv_len;
935
936 macsec_skb_cb(skb)->valid = false;
937 skb = skb_share_check(skb, GFP_ATOMIC);
938 if (!skb)
939 return ERR_PTR(-ENOMEM);
940
941 ret = skb_cow_data(skb, 0, &trailer);
942 if (unlikely(ret < 0)) {
943 kfree_skb(skb);
944 return ERR_PTR(ret);
945 }
946 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
947 if (!req) {
948 kfree_skb(skb);
949 return ERR_PTR(-ENOMEM);
950 }
951
952 hdr = (struct macsec_eth_header *)skb->data;
953 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
954
955 sg_init_table(sg, ret);
956 ret = skb_to_sgvec(skb, sg, 0, skb->len);
957 if (unlikely(ret < 0)) {
958 aead_request_free(req);
959 kfree_skb(skb);
960 return ERR_PTR(ret);
961 }
962
963 if (hdr->tci_an & MACSEC_TCI_E) {
964 /* confidentiality: ethernet + macsec header
965 * authenticated, encrypted payload
966 */
967 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
968
969 aead_request_set_crypt(req, sg, sg, len, iv);
970 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
971 skb = skb_unshare(skb, GFP_ATOMIC);
972 if (!skb) {
973 aead_request_free(req);
974 return ERR_PTR(-ENOMEM);
975 }
976 } else {
977 /* integrity only: all headers + data authenticated */
978 aead_request_set_crypt(req, sg, sg, icv_len, iv);
979 aead_request_set_ad(req, skb->len - icv_len);
980 }
981
982 macsec_skb_cb(skb)->req = req;
983 skb->dev = dev;
984 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
985
986 dev_hold(dev);
987 ret = crypto_aead_decrypt(req);
988 if (ret == -EINPROGRESS) {
989 return ERR_PTR(ret);
990 } else if (ret != 0) {
991 /* decryption/authentication failed
992 * 10.6 if validateFrames is disabled, deliver anyway
993 */
994 if (ret != -EBADMSG) {
995 kfree_skb(skb);
996 skb = ERR_PTR(ret);
997 }
998 } else {
999 macsec_skb_cb(skb)->valid = true;
1000 }
1001 dev_put(dev);
1002
1003 aead_request_free(req);
1004
1005 return skb;
1006 }
1007
1008 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
1009 {
1010 struct macsec_rx_sc *rx_sc;
1011
1012 for_each_rxsc(secy, rx_sc) {
1013 if (rx_sc->sci == sci)
1014 return rx_sc;
1015 }
1016
1017 return NULL;
1018 }
1019
1020 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
1021 {
1022 struct macsec_rx_sc *rx_sc;
1023
1024 for_each_rxsc_rtnl(secy, rx_sc) {
1025 if (rx_sc->sci == sci)
1026 return rx_sc;
1027 }
1028
1029 return NULL;
1030 }
1031
1032 static void handle_not_macsec(struct sk_buff *skb)
1033 {
1034 struct macsec_rxh_data *rxd;
1035 struct macsec_dev *macsec;
1036
1037 rcu_read_lock();
1038 rxd = macsec_data_rcu(skb->dev);
1039
1040 /* 10.6 If the management control validateFrames is not
1041 * Strict, frames without a SecTAG are received, counted, and
1042 * delivered to the Controlled Port
1043 */
1044 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1045 struct sk_buff *nskb;
1046 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1047
1048 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1049 u64_stats_update_begin(&secy_stats->syncp);
1050 secy_stats->stats.InPktsNoTag++;
1051 u64_stats_update_end(&secy_stats->syncp);
1052 continue;
1053 }
1054
1055 /* deliver on this port */
1056 nskb = skb_clone(skb, GFP_ATOMIC);
1057 if (!nskb)
1058 break;
1059
1060 nskb->dev = macsec->secy.netdev;
1061
1062 if (netif_rx(nskb) == NET_RX_SUCCESS) {
1063 u64_stats_update_begin(&secy_stats->syncp);
1064 secy_stats->stats.InPktsUntagged++;
1065 u64_stats_update_end(&secy_stats->syncp);
1066 }
1067 }
1068
1069 rcu_read_unlock();
1070 }
1071
1072 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1073 {
1074 struct sk_buff *skb = *pskb;
1075 struct net_device *dev = skb->dev;
1076 struct macsec_eth_header *hdr;
1077 struct macsec_secy *secy = NULL;
1078 struct macsec_rx_sc *rx_sc;
1079 struct macsec_rx_sa *rx_sa;
1080 struct macsec_rxh_data *rxd;
1081 struct macsec_dev *macsec;
1082 sci_t sci;
1083 u32 pn;
1084 bool cbit;
1085 struct pcpu_rx_sc_stats *rxsc_stats;
1086 struct pcpu_secy_stats *secy_stats;
1087 bool pulled_sci;
1088 int ret;
1089
1090 if (skb_headroom(skb) < ETH_HLEN)
1091 goto drop_direct;
1092
1093 hdr = macsec_ethhdr(skb);
1094 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1095 handle_not_macsec(skb);
1096
1097 /* and deliver to the uncontrolled port */
1098 return RX_HANDLER_PASS;
1099 }
1100
1101 skb = skb_unshare(skb, GFP_ATOMIC);
1102 if (!skb) {
1103 *pskb = NULL;
1104 return RX_HANDLER_CONSUMED;
1105 }
1106
1107 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1108 if (!pulled_sci) {
1109 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1110 goto drop_direct;
1111 }
1112
1113 hdr = macsec_ethhdr(skb);
1114
1115 /* Frames with a SecTAG that has the TCI E bit set but the C
1116 * bit clear are discarded, as this reserved encoding is used
1117 * to identify frames with a SecTAG that are not to be
1118 * delivered to the Controlled Port.
1119 */
1120 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1121 return RX_HANDLER_PASS;
1122
1123 /* now, pull the extra length */
1124 if (hdr->tci_an & MACSEC_TCI_SC) {
1125 if (!pulled_sci)
1126 goto drop_direct;
1127 }
1128
1129 /* ethernet header is part of crypto processing */
1130 skb_push(skb, ETH_HLEN);
1131
1132 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1133 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1134 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1135
1136 rcu_read_lock();
1137 rxd = macsec_data_rcu(skb->dev);
1138
1139 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1140 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1141 sc = sc ? macsec_rxsc_get(sc) : NULL;
1142
1143 if (sc) {
1144 secy = &macsec->secy;
1145 rx_sc = sc;
1146 break;
1147 }
1148 }
1149
1150 if (!secy)
1151 goto nosci;
1152
1153 dev = secy->netdev;
1154 macsec = macsec_priv(dev);
1155 secy_stats = this_cpu_ptr(macsec->stats);
1156 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1157
1158 if (!macsec_validate_skb(skb, secy->icv_len)) {
1159 u64_stats_update_begin(&secy_stats->syncp);
1160 secy_stats->stats.InPktsBadTag++;
1161 u64_stats_update_end(&secy_stats->syncp);
1162 goto drop_nosa;
1163 }
1164
1165 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1166 if (!rx_sa) {
1167 /* 10.6.1 if the SA is not in use */
1168
1169 /* If validateFrames is Strict or the C bit in the
1170 * SecTAG is set, discard
1171 */
1172 if (hdr->tci_an & MACSEC_TCI_C ||
1173 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1174 u64_stats_update_begin(&rxsc_stats->syncp);
1175 rxsc_stats->stats.InPktsNotUsingSA++;
1176 u64_stats_update_end(&rxsc_stats->syncp);
1177 goto drop_nosa;
1178 }
1179
1180 /* not Strict, the frame (with the SecTAG and ICV
1181 * removed) is delivered to the Controlled Port.
1182 */
1183 u64_stats_update_begin(&rxsc_stats->syncp);
1184 rxsc_stats->stats.InPktsUnusedSA++;
1185 u64_stats_update_end(&rxsc_stats->syncp);
1186 goto deliver;
1187 }
1188
1189 /* First, PN check to avoid decrypting obviously wrong packets */
1190 pn = ntohl(hdr->packet_number);
1191 if (secy->replay_protect) {
1192 bool late;
1193
1194 spin_lock(&rx_sa->lock);
1195 late = rx_sa->next_pn >= secy->replay_window &&
1196 pn < (rx_sa->next_pn - secy->replay_window);
1197 spin_unlock(&rx_sa->lock);
1198
1199 if (late) {
1200 u64_stats_update_begin(&rxsc_stats->syncp);
1201 rxsc_stats->stats.InPktsLate++;
1202 u64_stats_update_end(&rxsc_stats->syncp);
1203 goto drop;
1204 }
1205 }
1206
1207 macsec_skb_cb(skb)->rx_sa = rx_sa;
1208
1209 /* Disabled && !changed text => skip validation */
1210 if (hdr->tci_an & MACSEC_TCI_C ||
1211 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1212 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1213
1214 if (IS_ERR(skb)) {
1215 /* the decrypt callback needs the reference */
1216 if (PTR_ERR(skb) != -EINPROGRESS) {
1217 macsec_rxsa_put(rx_sa);
1218 macsec_rxsc_put(rx_sc);
1219 }
1220 rcu_read_unlock();
1221 *pskb = NULL;
1222 return RX_HANDLER_CONSUMED;
1223 }
1224
1225 if (!macsec_post_decrypt(skb, secy, pn))
1226 goto drop;
1227
1228 deliver:
1229 macsec_finalize_skb(skb, secy->icv_len,
1230 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1231 macsec_reset_skb(skb, secy->netdev);
1232
1233 if (rx_sa)
1234 macsec_rxsa_put(rx_sa);
1235 macsec_rxsc_put(rx_sc);
1236
1237 ret = gro_cells_receive(&macsec->gro_cells, skb);
1238 if (ret == NET_RX_SUCCESS)
1239 count_rx(dev, skb->len);
1240 else
1241 macsec->secy.netdev->stats.rx_dropped++;
1242
1243 rcu_read_unlock();
1244
1245 *pskb = NULL;
1246 return RX_HANDLER_CONSUMED;
1247
1248 drop:
1249 macsec_rxsa_put(rx_sa);
1250 drop_nosa:
1251 macsec_rxsc_put(rx_sc);
1252 rcu_read_unlock();
1253 drop_direct:
1254 kfree_skb(skb);
1255 *pskb = NULL;
1256 return RX_HANDLER_CONSUMED;
1257
1258 nosci:
1259 /* 10.6.1 if the SC is not found */
1260 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1261 if (!cbit)
1262 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1263 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1264
1265 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1266 struct sk_buff *nskb;
1267
1268 secy_stats = this_cpu_ptr(macsec->stats);
1269
1270 /* If validateFrames is Strict or the C bit in the
1271 * SecTAG is set, discard
1272 */
1273 if (cbit ||
1274 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1275 u64_stats_update_begin(&secy_stats->syncp);
1276 secy_stats->stats.InPktsNoSCI++;
1277 u64_stats_update_end(&secy_stats->syncp);
1278 continue;
1279 }
1280
1281 /* not strict, the frame (with the SecTAG and ICV
1282 * removed) is delivered to the Controlled Port.
1283 */
1284 nskb = skb_clone(skb, GFP_ATOMIC);
1285 if (!nskb)
1286 break;
1287
1288 macsec_reset_skb(nskb, macsec->secy.netdev);
1289
1290 ret = netif_rx(nskb);
1291 if (ret == NET_RX_SUCCESS) {
1292 u64_stats_update_begin(&secy_stats->syncp);
1293 secy_stats->stats.InPktsUnknownSCI++;
1294 u64_stats_update_end(&secy_stats->syncp);
1295 } else {
1296 macsec->secy.netdev->stats.rx_dropped++;
1297 }
1298 }
1299
1300 rcu_read_unlock();
1301 *pskb = skb;
1302 return RX_HANDLER_PASS;
1303 }
1304
1305 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1306 {
1307 struct crypto_aead *tfm;
1308 int ret;
1309
1310 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1311
1312 if (IS_ERR(tfm))
1313 return tfm;
1314
1315 ret = crypto_aead_setkey(tfm, key, key_len);
1316 if (ret < 0)
1317 goto fail;
1318
1319 ret = crypto_aead_setauthsize(tfm, icv_len);
1320 if (ret < 0)
1321 goto fail;
1322
1323 return tfm;
1324 fail:
1325 crypto_free_aead(tfm);
1326 return ERR_PTR(ret);
1327 }
1328
1329 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1330 int icv_len)
1331 {
1332 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1333 if (!rx_sa->stats)
1334 return -ENOMEM;
1335
1336 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1337 if (IS_ERR(rx_sa->key.tfm)) {
1338 free_percpu(rx_sa->stats);
1339 return PTR_ERR(rx_sa->key.tfm);
1340 }
1341
1342 rx_sa->active = false;
1343 rx_sa->next_pn = 1;
1344 atomic_set(&rx_sa->refcnt, 1);
1345 spin_lock_init(&rx_sa->lock);
1346
1347 return 0;
1348 }
1349
1350 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1351 {
1352 rx_sa->active = false;
1353
1354 macsec_rxsa_put(rx_sa);
1355 }
1356
1357 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1358 {
1359 int i;
1360
1361 for (i = 0; i < MACSEC_NUM_AN; i++) {
1362 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1363
1364 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1365 if (sa)
1366 clear_rx_sa(sa);
1367 }
1368
1369 macsec_rxsc_put(rx_sc);
1370 }
1371
1372 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1373 {
1374 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1375
1376 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1377 rx_sc;
1378 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1379 if (rx_sc->sci == sci) {
1380 if (rx_sc->active)
1381 secy->n_rx_sc--;
1382 rcu_assign_pointer(*rx_scp, rx_sc->next);
1383 return rx_sc;
1384 }
1385 }
1386
1387 return NULL;
1388 }
1389
1390 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1391 {
1392 struct macsec_rx_sc *rx_sc;
1393 struct macsec_dev *macsec;
1394 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1395 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1396 struct macsec_secy *secy;
1397
1398 list_for_each_entry(macsec, &rxd->secys, secys) {
1399 if (find_rx_sc_rtnl(&macsec->secy, sci))
1400 return ERR_PTR(-EEXIST);
1401 }
1402
1403 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1404 if (!rx_sc)
1405 return ERR_PTR(-ENOMEM);
1406
1407 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1408 if (!rx_sc->stats) {
1409 kfree(rx_sc);
1410 return ERR_PTR(-ENOMEM);
1411 }
1412
1413 rx_sc->sci = sci;
1414 rx_sc->active = true;
1415 atomic_set(&rx_sc->refcnt, 1);
1416
1417 secy = &macsec_priv(dev)->secy;
1418 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1419 rcu_assign_pointer(secy->rx_sc, rx_sc);
1420
1421 if (rx_sc->active)
1422 secy->n_rx_sc++;
1423
1424 return rx_sc;
1425 }
1426
1427 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1428 int icv_len)
1429 {
1430 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1431 if (!tx_sa->stats)
1432 return -ENOMEM;
1433
1434 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1435 if (IS_ERR(tx_sa->key.tfm)) {
1436 free_percpu(tx_sa->stats);
1437 return PTR_ERR(tx_sa->key.tfm);
1438 }
1439
1440 tx_sa->active = false;
1441 atomic_set(&tx_sa->refcnt, 1);
1442 spin_lock_init(&tx_sa->lock);
1443
1444 return 0;
1445 }
1446
1447 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1448 {
1449 tx_sa->active = false;
1450
1451 macsec_txsa_put(tx_sa);
1452 }
1453
1454 static struct genl_family macsec_fam;
1455
1456 static struct net_device *get_dev_from_nl(struct net *net,
1457 struct nlattr **attrs)
1458 {
1459 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1460 struct net_device *dev;
1461
1462 dev = __dev_get_by_index(net, ifindex);
1463 if (!dev)
1464 return ERR_PTR(-ENODEV);
1465
1466 if (!netif_is_macsec(dev))
1467 return ERR_PTR(-ENODEV);
1468
1469 return dev;
1470 }
1471
1472 static sci_t nla_get_sci(const struct nlattr *nla)
1473 {
1474 return (__force sci_t)nla_get_u64(nla);
1475 }
1476
1477 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1478 int padattr)
1479 {
1480 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1481 }
1482
1483 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1484 struct nlattr **attrs,
1485 struct nlattr **tb_sa,
1486 struct net_device **devp,
1487 struct macsec_secy **secyp,
1488 struct macsec_tx_sc **scp,
1489 u8 *assoc_num)
1490 {
1491 struct net_device *dev;
1492 struct macsec_secy *secy;
1493 struct macsec_tx_sc *tx_sc;
1494 struct macsec_tx_sa *tx_sa;
1495
1496 if (!tb_sa[MACSEC_SA_ATTR_AN])
1497 return ERR_PTR(-EINVAL);
1498
1499 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1500
1501 dev = get_dev_from_nl(net, attrs);
1502 if (IS_ERR(dev))
1503 return ERR_CAST(dev);
1504
1505 if (*assoc_num >= MACSEC_NUM_AN)
1506 return ERR_PTR(-EINVAL);
1507
1508 secy = &macsec_priv(dev)->secy;
1509 tx_sc = &secy->tx_sc;
1510
1511 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1512 if (!tx_sa)
1513 return ERR_PTR(-ENODEV);
1514
1515 *devp = dev;
1516 *scp = tx_sc;
1517 *secyp = secy;
1518 return tx_sa;
1519 }
1520
1521 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1522 struct nlattr **attrs,
1523 struct nlattr **tb_rxsc,
1524 struct net_device **devp,
1525 struct macsec_secy **secyp)
1526 {
1527 struct net_device *dev;
1528 struct macsec_secy *secy;
1529 struct macsec_rx_sc *rx_sc;
1530 sci_t sci;
1531
1532 dev = get_dev_from_nl(net, attrs);
1533 if (IS_ERR(dev))
1534 return ERR_CAST(dev);
1535
1536 secy = &macsec_priv(dev)->secy;
1537
1538 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1539 return ERR_PTR(-EINVAL);
1540
1541 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1542 rx_sc = find_rx_sc_rtnl(secy, sci);
1543 if (!rx_sc)
1544 return ERR_PTR(-ENODEV);
1545
1546 *secyp = secy;
1547 *devp = dev;
1548
1549 return rx_sc;
1550 }
1551
1552 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1553 struct nlattr **attrs,
1554 struct nlattr **tb_rxsc,
1555 struct nlattr **tb_sa,
1556 struct net_device **devp,
1557 struct macsec_secy **secyp,
1558 struct macsec_rx_sc **scp,
1559 u8 *assoc_num)
1560 {
1561 struct macsec_rx_sc *rx_sc;
1562 struct macsec_rx_sa *rx_sa;
1563
1564 if (!tb_sa[MACSEC_SA_ATTR_AN])
1565 return ERR_PTR(-EINVAL);
1566
1567 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1568 if (*assoc_num >= MACSEC_NUM_AN)
1569 return ERR_PTR(-EINVAL);
1570
1571 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1572 if (IS_ERR(rx_sc))
1573 return ERR_CAST(rx_sc);
1574
1575 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1576 if (!rx_sa)
1577 return ERR_PTR(-ENODEV);
1578
1579 *scp = rx_sc;
1580 return rx_sa;
1581 }
1582
1583
1584 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1585 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1586 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1587 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1588 };
1589
1590 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1591 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1592 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1593 };
1594
1595 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1596 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1597 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1598 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1599 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1600 .len = MACSEC_KEYID_LEN, },
1601 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1602 .len = MACSEC_MAX_KEY_LEN, },
1603 };
1604
1605 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1606 {
1607 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1608 return -EINVAL;
1609
1610 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX,
1611 attrs[MACSEC_ATTR_SA_CONFIG],
1612 macsec_genl_sa_policy, NULL))
1613 return -EINVAL;
1614
1615 return 0;
1616 }
1617
1618 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1619 {
1620 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1621 return -EINVAL;
1622
1623 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX,
1624 attrs[MACSEC_ATTR_RXSC_CONFIG],
1625 macsec_genl_rxsc_policy, NULL))
1626 return -EINVAL;
1627
1628 return 0;
1629 }
1630
1631 static bool validate_add_rxsa(struct nlattr **attrs)
1632 {
1633 if (!attrs[MACSEC_SA_ATTR_AN] ||
1634 !attrs[MACSEC_SA_ATTR_KEY] ||
1635 !attrs[MACSEC_SA_ATTR_KEYID])
1636 return false;
1637
1638 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1639 return false;
1640
1641 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1642 return false;
1643
1644 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1645 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1646 return false;
1647 }
1648
1649 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1650 return false;
1651
1652 return true;
1653 }
1654
1655 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1656 {
1657 struct net_device *dev;
1658 struct nlattr **attrs = info->attrs;
1659 struct macsec_secy *secy;
1660 struct macsec_rx_sc *rx_sc;
1661 struct macsec_rx_sa *rx_sa;
1662 unsigned char assoc_num;
1663 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1664 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1665 int err;
1666
1667 if (!attrs[MACSEC_ATTR_IFINDEX])
1668 return -EINVAL;
1669
1670 if (parse_sa_config(attrs, tb_sa))
1671 return -EINVAL;
1672
1673 if (parse_rxsc_config(attrs, tb_rxsc))
1674 return -EINVAL;
1675
1676 if (!validate_add_rxsa(tb_sa))
1677 return -EINVAL;
1678
1679 rtnl_lock();
1680 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1681 if (IS_ERR(rx_sc)) {
1682 rtnl_unlock();
1683 return PTR_ERR(rx_sc);
1684 }
1685
1686 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1687
1688 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1689 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1690 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1691 rtnl_unlock();
1692 return -EINVAL;
1693 }
1694
1695 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1696 if (rx_sa) {
1697 rtnl_unlock();
1698 return -EBUSY;
1699 }
1700
1701 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1702 if (!rx_sa) {
1703 rtnl_unlock();
1704 return -ENOMEM;
1705 }
1706
1707 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1708 secy->key_len, secy->icv_len);
1709 if (err < 0) {
1710 kfree(rx_sa);
1711 rtnl_unlock();
1712 return err;
1713 }
1714
1715 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1716 spin_lock_bh(&rx_sa->lock);
1717 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1718 spin_unlock_bh(&rx_sa->lock);
1719 }
1720
1721 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1722 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1723
1724 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1725 rx_sa->sc = rx_sc;
1726 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1727
1728 rtnl_unlock();
1729
1730 return 0;
1731 }
1732
1733 static bool validate_add_rxsc(struct nlattr **attrs)
1734 {
1735 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1736 return false;
1737
1738 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1739 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1740 return false;
1741 }
1742
1743 return true;
1744 }
1745
1746 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1747 {
1748 struct net_device *dev;
1749 sci_t sci = MACSEC_UNDEF_SCI;
1750 struct nlattr **attrs = info->attrs;
1751 struct macsec_rx_sc *rx_sc;
1752 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1753
1754 if (!attrs[MACSEC_ATTR_IFINDEX])
1755 return -EINVAL;
1756
1757 if (parse_rxsc_config(attrs, tb_rxsc))
1758 return -EINVAL;
1759
1760 if (!validate_add_rxsc(tb_rxsc))
1761 return -EINVAL;
1762
1763 rtnl_lock();
1764 dev = get_dev_from_nl(genl_info_net(info), attrs);
1765 if (IS_ERR(dev)) {
1766 rtnl_unlock();
1767 return PTR_ERR(dev);
1768 }
1769
1770 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1771
1772 rx_sc = create_rx_sc(dev, sci);
1773 if (IS_ERR(rx_sc)) {
1774 rtnl_unlock();
1775 return PTR_ERR(rx_sc);
1776 }
1777
1778 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1779 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1780
1781 rtnl_unlock();
1782
1783 return 0;
1784 }
1785
1786 static bool validate_add_txsa(struct nlattr **attrs)
1787 {
1788 if (!attrs[MACSEC_SA_ATTR_AN] ||
1789 !attrs[MACSEC_SA_ATTR_PN] ||
1790 !attrs[MACSEC_SA_ATTR_KEY] ||
1791 !attrs[MACSEC_SA_ATTR_KEYID])
1792 return false;
1793
1794 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1795 return false;
1796
1797 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1798 return false;
1799
1800 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1801 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1802 return false;
1803 }
1804
1805 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1806 return false;
1807
1808 return true;
1809 }
1810
1811 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1812 {
1813 struct net_device *dev;
1814 struct nlattr **attrs = info->attrs;
1815 struct macsec_secy *secy;
1816 struct macsec_tx_sc *tx_sc;
1817 struct macsec_tx_sa *tx_sa;
1818 unsigned char assoc_num;
1819 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1820 int err;
1821
1822 if (!attrs[MACSEC_ATTR_IFINDEX])
1823 return -EINVAL;
1824
1825 if (parse_sa_config(attrs, tb_sa))
1826 return -EINVAL;
1827
1828 if (!validate_add_txsa(tb_sa))
1829 return -EINVAL;
1830
1831 rtnl_lock();
1832 dev = get_dev_from_nl(genl_info_net(info), attrs);
1833 if (IS_ERR(dev)) {
1834 rtnl_unlock();
1835 return PTR_ERR(dev);
1836 }
1837
1838 secy = &macsec_priv(dev)->secy;
1839 tx_sc = &secy->tx_sc;
1840
1841 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1842
1843 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1844 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1845 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1846 rtnl_unlock();
1847 return -EINVAL;
1848 }
1849
1850 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1851 if (tx_sa) {
1852 rtnl_unlock();
1853 return -EBUSY;
1854 }
1855
1856 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1857 if (!tx_sa) {
1858 rtnl_unlock();
1859 return -ENOMEM;
1860 }
1861
1862 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1863 secy->key_len, secy->icv_len);
1864 if (err < 0) {
1865 kfree(tx_sa);
1866 rtnl_unlock();
1867 return err;
1868 }
1869
1870 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1871
1872 spin_lock_bh(&tx_sa->lock);
1873 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1874 spin_unlock_bh(&tx_sa->lock);
1875
1876 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1877 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1878
1879 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1880 secy->operational = true;
1881
1882 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1883
1884 rtnl_unlock();
1885
1886 return 0;
1887 }
1888
1889 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1890 {
1891 struct nlattr **attrs = info->attrs;
1892 struct net_device *dev;
1893 struct macsec_secy *secy;
1894 struct macsec_rx_sc *rx_sc;
1895 struct macsec_rx_sa *rx_sa;
1896 u8 assoc_num;
1897 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1898 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1899
1900 if (!attrs[MACSEC_ATTR_IFINDEX])
1901 return -EINVAL;
1902
1903 if (parse_sa_config(attrs, tb_sa))
1904 return -EINVAL;
1905
1906 if (parse_rxsc_config(attrs, tb_rxsc))
1907 return -EINVAL;
1908
1909 rtnl_lock();
1910 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1911 &dev, &secy, &rx_sc, &assoc_num);
1912 if (IS_ERR(rx_sa)) {
1913 rtnl_unlock();
1914 return PTR_ERR(rx_sa);
1915 }
1916
1917 if (rx_sa->active) {
1918 rtnl_unlock();
1919 return -EBUSY;
1920 }
1921
1922 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1923 clear_rx_sa(rx_sa);
1924
1925 rtnl_unlock();
1926
1927 return 0;
1928 }
1929
1930 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1931 {
1932 struct nlattr **attrs = info->attrs;
1933 struct net_device *dev;
1934 struct macsec_secy *secy;
1935 struct macsec_rx_sc *rx_sc;
1936 sci_t sci;
1937 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1938
1939 if (!attrs[MACSEC_ATTR_IFINDEX])
1940 return -EINVAL;
1941
1942 if (parse_rxsc_config(attrs, tb_rxsc))
1943 return -EINVAL;
1944
1945 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1946 return -EINVAL;
1947
1948 rtnl_lock();
1949 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1950 if (IS_ERR(dev)) {
1951 rtnl_unlock();
1952 return PTR_ERR(dev);
1953 }
1954
1955 secy = &macsec_priv(dev)->secy;
1956 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1957
1958 rx_sc = del_rx_sc(secy, sci);
1959 if (!rx_sc) {
1960 rtnl_unlock();
1961 return -ENODEV;
1962 }
1963
1964 free_rx_sc(rx_sc);
1965 rtnl_unlock();
1966
1967 return 0;
1968 }
1969
1970 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1971 {
1972 struct nlattr **attrs = info->attrs;
1973 struct net_device *dev;
1974 struct macsec_secy *secy;
1975 struct macsec_tx_sc *tx_sc;
1976 struct macsec_tx_sa *tx_sa;
1977 u8 assoc_num;
1978 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1979
1980 if (!attrs[MACSEC_ATTR_IFINDEX])
1981 return -EINVAL;
1982
1983 if (parse_sa_config(attrs, tb_sa))
1984 return -EINVAL;
1985
1986 rtnl_lock();
1987 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1988 &dev, &secy, &tx_sc, &assoc_num);
1989 if (IS_ERR(tx_sa)) {
1990 rtnl_unlock();
1991 return PTR_ERR(tx_sa);
1992 }
1993
1994 if (tx_sa->active) {
1995 rtnl_unlock();
1996 return -EBUSY;
1997 }
1998
1999 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2000 clear_tx_sa(tx_sa);
2001
2002 rtnl_unlock();
2003
2004 return 0;
2005 }
2006
2007 static bool validate_upd_sa(struct nlattr **attrs)
2008 {
2009 if (!attrs[MACSEC_SA_ATTR_AN] ||
2010 attrs[MACSEC_SA_ATTR_KEY] ||
2011 attrs[MACSEC_SA_ATTR_KEYID])
2012 return false;
2013
2014 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2015 return false;
2016
2017 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
2018 return false;
2019
2020 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2021 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2022 return false;
2023 }
2024
2025 return true;
2026 }
2027
2028 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2029 {
2030 struct nlattr **attrs = info->attrs;
2031 struct net_device *dev;
2032 struct macsec_secy *secy;
2033 struct macsec_tx_sc *tx_sc;
2034 struct macsec_tx_sa *tx_sa;
2035 u8 assoc_num;
2036 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2037
2038 if (!attrs[MACSEC_ATTR_IFINDEX])
2039 return -EINVAL;
2040
2041 if (parse_sa_config(attrs, tb_sa))
2042 return -EINVAL;
2043
2044 if (!validate_upd_sa(tb_sa))
2045 return -EINVAL;
2046
2047 rtnl_lock();
2048 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2049 &dev, &secy, &tx_sc, &assoc_num);
2050 if (IS_ERR(tx_sa)) {
2051 rtnl_unlock();
2052 return PTR_ERR(tx_sa);
2053 }
2054
2055 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2056 spin_lock_bh(&tx_sa->lock);
2057 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2058 spin_unlock_bh(&tx_sa->lock);
2059 }
2060
2061 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2062 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2063
2064 if (assoc_num == tx_sc->encoding_sa)
2065 secy->operational = tx_sa->active;
2066
2067 rtnl_unlock();
2068
2069 return 0;
2070 }
2071
2072 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2073 {
2074 struct nlattr **attrs = info->attrs;
2075 struct net_device *dev;
2076 struct macsec_secy *secy;
2077 struct macsec_rx_sc *rx_sc;
2078 struct macsec_rx_sa *rx_sa;
2079 u8 assoc_num;
2080 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2081 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2082
2083 if (!attrs[MACSEC_ATTR_IFINDEX])
2084 return -EINVAL;
2085
2086 if (parse_rxsc_config(attrs, tb_rxsc))
2087 return -EINVAL;
2088
2089 if (parse_sa_config(attrs, tb_sa))
2090 return -EINVAL;
2091
2092 if (!validate_upd_sa(tb_sa))
2093 return -EINVAL;
2094
2095 rtnl_lock();
2096 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2097 &dev, &secy, &rx_sc, &assoc_num);
2098 if (IS_ERR(rx_sa)) {
2099 rtnl_unlock();
2100 return PTR_ERR(rx_sa);
2101 }
2102
2103 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2104 spin_lock_bh(&rx_sa->lock);
2105 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2106 spin_unlock_bh(&rx_sa->lock);
2107 }
2108
2109 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2110 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2111
2112 rtnl_unlock();
2113 return 0;
2114 }
2115
2116 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2117 {
2118 struct nlattr **attrs = info->attrs;
2119 struct net_device *dev;
2120 struct macsec_secy *secy;
2121 struct macsec_rx_sc *rx_sc;
2122 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2123
2124 if (!attrs[MACSEC_ATTR_IFINDEX])
2125 return -EINVAL;
2126
2127 if (parse_rxsc_config(attrs, tb_rxsc))
2128 return -EINVAL;
2129
2130 if (!validate_add_rxsc(tb_rxsc))
2131 return -EINVAL;
2132
2133 rtnl_lock();
2134 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2135 if (IS_ERR(rx_sc)) {
2136 rtnl_unlock();
2137 return PTR_ERR(rx_sc);
2138 }
2139
2140 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2141 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2142
2143 if (rx_sc->active != new)
2144 secy->n_rx_sc += new ? 1 : -1;
2145
2146 rx_sc->active = new;
2147 }
2148
2149 rtnl_unlock();
2150
2151 return 0;
2152 }
2153
2154 static int copy_tx_sa_stats(struct sk_buff *skb,
2155 struct macsec_tx_sa_stats __percpu *pstats)
2156 {
2157 struct macsec_tx_sa_stats sum = {0, };
2158 int cpu;
2159
2160 for_each_possible_cpu(cpu) {
2161 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2162
2163 sum.OutPktsProtected += stats->OutPktsProtected;
2164 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2165 }
2166
2167 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2168 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2169 return -EMSGSIZE;
2170
2171 return 0;
2172 }
2173
2174 static int copy_rx_sa_stats(struct sk_buff *skb,
2175 struct macsec_rx_sa_stats __percpu *pstats)
2176 {
2177 struct macsec_rx_sa_stats sum = {0, };
2178 int cpu;
2179
2180 for_each_possible_cpu(cpu) {
2181 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2182
2183 sum.InPktsOK += stats->InPktsOK;
2184 sum.InPktsInvalid += stats->InPktsInvalid;
2185 sum.InPktsNotValid += stats->InPktsNotValid;
2186 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2187 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2188 }
2189
2190 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2191 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2192 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2193 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2194 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2195 return -EMSGSIZE;
2196
2197 return 0;
2198 }
2199
2200 static int copy_rx_sc_stats(struct sk_buff *skb,
2201 struct pcpu_rx_sc_stats __percpu *pstats)
2202 {
2203 struct macsec_rx_sc_stats sum = {0, };
2204 int cpu;
2205
2206 for_each_possible_cpu(cpu) {
2207 const struct pcpu_rx_sc_stats *stats;
2208 struct macsec_rx_sc_stats tmp;
2209 unsigned int start;
2210
2211 stats = per_cpu_ptr(pstats, cpu);
2212 do {
2213 start = u64_stats_fetch_begin_irq(&stats->syncp);
2214 memcpy(&tmp, &stats->stats, sizeof(tmp));
2215 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2216
2217 sum.InOctetsValidated += tmp.InOctetsValidated;
2218 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2219 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2220 sum.InPktsDelayed += tmp.InPktsDelayed;
2221 sum.InPktsOK += tmp.InPktsOK;
2222 sum.InPktsInvalid += tmp.InPktsInvalid;
2223 sum.InPktsLate += tmp.InPktsLate;
2224 sum.InPktsNotValid += tmp.InPktsNotValid;
2225 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2226 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2227 }
2228
2229 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2230 sum.InOctetsValidated,
2231 MACSEC_RXSC_STATS_ATTR_PAD) ||
2232 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2233 sum.InOctetsDecrypted,
2234 MACSEC_RXSC_STATS_ATTR_PAD) ||
2235 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2236 sum.InPktsUnchecked,
2237 MACSEC_RXSC_STATS_ATTR_PAD) ||
2238 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2239 sum.InPktsDelayed,
2240 MACSEC_RXSC_STATS_ATTR_PAD) ||
2241 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2242 sum.InPktsOK,
2243 MACSEC_RXSC_STATS_ATTR_PAD) ||
2244 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2245 sum.InPktsInvalid,
2246 MACSEC_RXSC_STATS_ATTR_PAD) ||
2247 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2248 sum.InPktsLate,
2249 MACSEC_RXSC_STATS_ATTR_PAD) ||
2250 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2251 sum.InPktsNotValid,
2252 MACSEC_RXSC_STATS_ATTR_PAD) ||
2253 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2254 sum.InPktsNotUsingSA,
2255 MACSEC_RXSC_STATS_ATTR_PAD) ||
2256 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2257 sum.InPktsUnusedSA,
2258 MACSEC_RXSC_STATS_ATTR_PAD))
2259 return -EMSGSIZE;
2260
2261 return 0;
2262 }
2263
2264 static int copy_tx_sc_stats(struct sk_buff *skb,
2265 struct pcpu_tx_sc_stats __percpu *pstats)
2266 {
2267 struct macsec_tx_sc_stats sum = {0, };
2268 int cpu;
2269
2270 for_each_possible_cpu(cpu) {
2271 const struct pcpu_tx_sc_stats *stats;
2272 struct macsec_tx_sc_stats tmp;
2273 unsigned int start;
2274
2275 stats = per_cpu_ptr(pstats, cpu);
2276 do {
2277 start = u64_stats_fetch_begin_irq(&stats->syncp);
2278 memcpy(&tmp, &stats->stats, sizeof(tmp));
2279 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2280
2281 sum.OutPktsProtected += tmp.OutPktsProtected;
2282 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2283 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2284 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2285 }
2286
2287 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2288 sum.OutPktsProtected,
2289 MACSEC_TXSC_STATS_ATTR_PAD) ||
2290 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2291 sum.OutPktsEncrypted,
2292 MACSEC_TXSC_STATS_ATTR_PAD) ||
2293 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2294 sum.OutOctetsProtected,
2295 MACSEC_TXSC_STATS_ATTR_PAD) ||
2296 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2297 sum.OutOctetsEncrypted,
2298 MACSEC_TXSC_STATS_ATTR_PAD))
2299 return -EMSGSIZE;
2300
2301 return 0;
2302 }
2303
2304 static int copy_secy_stats(struct sk_buff *skb,
2305 struct pcpu_secy_stats __percpu *pstats)
2306 {
2307 struct macsec_dev_stats sum = {0, };
2308 int cpu;
2309
2310 for_each_possible_cpu(cpu) {
2311 const struct pcpu_secy_stats *stats;
2312 struct macsec_dev_stats tmp;
2313 unsigned int start;
2314
2315 stats = per_cpu_ptr(pstats, cpu);
2316 do {
2317 start = u64_stats_fetch_begin_irq(&stats->syncp);
2318 memcpy(&tmp, &stats->stats, sizeof(tmp));
2319 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2320
2321 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2322 sum.InPktsUntagged += tmp.InPktsUntagged;
2323 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2324 sum.InPktsNoTag += tmp.InPktsNoTag;
2325 sum.InPktsBadTag += tmp.InPktsBadTag;
2326 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2327 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2328 sum.InPktsOverrun += tmp.InPktsOverrun;
2329 }
2330
2331 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2332 sum.OutPktsUntagged,
2333 MACSEC_SECY_STATS_ATTR_PAD) ||
2334 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2335 sum.InPktsUntagged,
2336 MACSEC_SECY_STATS_ATTR_PAD) ||
2337 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2338 sum.OutPktsTooLong,
2339 MACSEC_SECY_STATS_ATTR_PAD) ||
2340 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2341 sum.InPktsNoTag,
2342 MACSEC_SECY_STATS_ATTR_PAD) ||
2343 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2344 sum.InPktsBadTag,
2345 MACSEC_SECY_STATS_ATTR_PAD) ||
2346 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2347 sum.InPktsUnknownSCI,
2348 MACSEC_SECY_STATS_ATTR_PAD) ||
2349 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2350 sum.InPktsNoSCI,
2351 MACSEC_SECY_STATS_ATTR_PAD) ||
2352 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2353 sum.InPktsOverrun,
2354 MACSEC_SECY_STATS_ATTR_PAD))
2355 return -EMSGSIZE;
2356
2357 return 0;
2358 }
2359
2360 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2361 {
2362 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2363 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2364
2365 if (!secy_nest)
2366 return 1;
2367
2368 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2369 MACSEC_SECY_ATTR_PAD) ||
2370 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2371 MACSEC_DEFAULT_CIPHER_ID,
2372 MACSEC_SECY_ATTR_PAD) ||
2373 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2374 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2375 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2376 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2377 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2378 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2379 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2380 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2381 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2382 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2383 goto cancel;
2384
2385 if (secy->replay_protect) {
2386 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2387 goto cancel;
2388 }
2389
2390 nla_nest_end(skb, secy_nest);
2391 return 0;
2392
2393 cancel:
2394 nla_nest_cancel(skb, secy_nest);
2395 return 1;
2396 }
2397
2398 static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2399 struct sk_buff *skb, struct netlink_callback *cb)
2400 {
2401 struct macsec_rx_sc *rx_sc;
2402 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2403 struct nlattr *txsa_list, *rxsc_list;
2404 int i, j;
2405 void *hdr;
2406 struct nlattr *attr;
2407
2408 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2409 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2410 if (!hdr)
2411 return -EMSGSIZE;
2412
2413 genl_dump_check_consistent(cb, hdr, &macsec_fam);
2414
2415 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2416 goto nla_put_failure;
2417
2418 if (nla_put_secy(secy, skb))
2419 goto nla_put_failure;
2420
2421 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2422 if (!attr)
2423 goto nla_put_failure;
2424 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2425 nla_nest_cancel(skb, attr);
2426 goto nla_put_failure;
2427 }
2428 nla_nest_end(skb, attr);
2429
2430 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2431 if (!attr)
2432 goto nla_put_failure;
2433 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2434 nla_nest_cancel(skb, attr);
2435 goto nla_put_failure;
2436 }
2437 nla_nest_end(skb, attr);
2438
2439 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2440 if (!txsa_list)
2441 goto nla_put_failure;
2442 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2443 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2444 struct nlattr *txsa_nest;
2445
2446 if (!tx_sa)
2447 continue;
2448
2449 txsa_nest = nla_nest_start(skb, j++);
2450 if (!txsa_nest) {
2451 nla_nest_cancel(skb, txsa_list);
2452 goto nla_put_failure;
2453 }
2454
2455 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2456 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2457 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2458 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2459 nla_nest_cancel(skb, txsa_nest);
2460 nla_nest_cancel(skb, txsa_list);
2461 goto nla_put_failure;
2462 }
2463
2464 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2465 if (!attr) {
2466 nla_nest_cancel(skb, txsa_nest);
2467 nla_nest_cancel(skb, txsa_list);
2468 goto nla_put_failure;
2469 }
2470 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2471 nla_nest_cancel(skb, attr);
2472 nla_nest_cancel(skb, txsa_nest);
2473 nla_nest_cancel(skb, txsa_list);
2474 goto nla_put_failure;
2475 }
2476 nla_nest_end(skb, attr);
2477
2478 nla_nest_end(skb, txsa_nest);
2479 }
2480 nla_nest_end(skb, txsa_list);
2481
2482 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2483 if (!rxsc_list)
2484 goto nla_put_failure;
2485
2486 j = 1;
2487 for_each_rxsc_rtnl(secy, rx_sc) {
2488 int k;
2489 struct nlattr *rxsa_list;
2490 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2491
2492 if (!rxsc_nest) {
2493 nla_nest_cancel(skb, rxsc_list);
2494 goto nla_put_failure;
2495 }
2496
2497 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2498 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
2499 MACSEC_RXSC_ATTR_PAD)) {
2500 nla_nest_cancel(skb, rxsc_nest);
2501 nla_nest_cancel(skb, rxsc_list);
2502 goto nla_put_failure;
2503 }
2504
2505 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2506 if (!attr) {
2507 nla_nest_cancel(skb, rxsc_nest);
2508 nla_nest_cancel(skb, rxsc_list);
2509 goto nla_put_failure;
2510 }
2511 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2512 nla_nest_cancel(skb, attr);
2513 nla_nest_cancel(skb, rxsc_nest);
2514 nla_nest_cancel(skb, rxsc_list);
2515 goto nla_put_failure;
2516 }
2517 nla_nest_end(skb, attr);
2518
2519 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2520 if (!rxsa_list) {
2521 nla_nest_cancel(skb, rxsc_nest);
2522 nla_nest_cancel(skb, rxsc_list);
2523 goto nla_put_failure;
2524 }
2525
2526 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2527 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2528 struct nlattr *rxsa_nest;
2529
2530 if (!rx_sa)
2531 continue;
2532
2533 rxsa_nest = nla_nest_start(skb, k++);
2534 if (!rxsa_nest) {
2535 nla_nest_cancel(skb, rxsa_list);
2536 nla_nest_cancel(skb, rxsc_nest);
2537 nla_nest_cancel(skb, rxsc_list);
2538 goto nla_put_failure;
2539 }
2540
2541 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2542 if (!attr) {
2543 nla_nest_cancel(skb, rxsa_list);
2544 nla_nest_cancel(skb, rxsc_nest);
2545 nla_nest_cancel(skb, rxsc_list);
2546 goto nla_put_failure;
2547 }
2548 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2549 nla_nest_cancel(skb, attr);
2550 nla_nest_cancel(skb, rxsa_list);
2551 nla_nest_cancel(skb, rxsc_nest);
2552 nla_nest_cancel(skb, rxsc_list);
2553 goto nla_put_failure;
2554 }
2555 nla_nest_end(skb, attr);
2556
2557 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2558 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2559 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2560 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2561 nla_nest_cancel(skb, rxsa_nest);
2562 nla_nest_cancel(skb, rxsc_nest);
2563 nla_nest_cancel(skb, rxsc_list);
2564 goto nla_put_failure;
2565 }
2566 nla_nest_end(skb, rxsa_nest);
2567 }
2568
2569 nla_nest_end(skb, rxsa_list);
2570 nla_nest_end(skb, rxsc_nest);
2571 }
2572
2573 nla_nest_end(skb, rxsc_list);
2574
2575 genlmsg_end(skb, hdr);
2576
2577 return 0;
2578
2579 nla_put_failure:
2580 genlmsg_cancel(skb, hdr);
2581 return -EMSGSIZE;
2582 }
2583
2584 static int macsec_generation = 1; /* protected by RTNL */
2585
2586 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2587 {
2588 struct net *net = sock_net(skb->sk);
2589 struct net_device *dev;
2590 int dev_idx, d;
2591
2592 dev_idx = cb->args[0];
2593
2594 d = 0;
2595 rtnl_lock();
2596
2597 cb->seq = macsec_generation;
2598
2599 for_each_netdev(net, dev) {
2600 struct macsec_secy *secy;
2601
2602 if (d < dev_idx)
2603 goto next;
2604
2605 if (!netif_is_macsec(dev))
2606 goto next;
2607
2608 secy = &macsec_priv(dev)->secy;
2609 if (dump_secy(secy, dev, skb, cb) < 0)
2610 goto done;
2611 next:
2612 d++;
2613 }
2614
2615 done:
2616 rtnl_unlock();
2617 cb->args[0] = d;
2618 return skb->len;
2619 }
2620
2621 static const struct genl_ops macsec_genl_ops[] = {
2622 {
2623 .cmd = MACSEC_CMD_GET_TXSC,
2624 .dumpit = macsec_dump_txsc,
2625 .policy = macsec_genl_policy,
2626 },
2627 {
2628 .cmd = MACSEC_CMD_ADD_RXSC,
2629 .doit = macsec_add_rxsc,
2630 .policy = macsec_genl_policy,
2631 .flags = GENL_ADMIN_PERM,
2632 },
2633 {
2634 .cmd = MACSEC_CMD_DEL_RXSC,
2635 .doit = macsec_del_rxsc,
2636 .policy = macsec_genl_policy,
2637 .flags = GENL_ADMIN_PERM,
2638 },
2639 {
2640 .cmd = MACSEC_CMD_UPD_RXSC,
2641 .doit = macsec_upd_rxsc,
2642 .policy = macsec_genl_policy,
2643 .flags = GENL_ADMIN_PERM,
2644 },
2645 {
2646 .cmd = MACSEC_CMD_ADD_TXSA,
2647 .doit = macsec_add_txsa,
2648 .policy = macsec_genl_policy,
2649 .flags = GENL_ADMIN_PERM,
2650 },
2651 {
2652 .cmd = MACSEC_CMD_DEL_TXSA,
2653 .doit = macsec_del_txsa,
2654 .policy = macsec_genl_policy,
2655 .flags = GENL_ADMIN_PERM,
2656 },
2657 {
2658 .cmd = MACSEC_CMD_UPD_TXSA,
2659 .doit = macsec_upd_txsa,
2660 .policy = macsec_genl_policy,
2661 .flags = GENL_ADMIN_PERM,
2662 },
2663 {
2664 .cmd = MACSEC_CMD_ADD_RXSA,
2665 .doit = macsec_add_rxsa,
2666 .policy = macsec_genl_policy,
2667 .flags = GENL_ADMIN_PERM,
2668 },
2669 {
2670 .cmd = MACSEC_CMD_DEL_RXSA,
2671 .doit = macsec_del_rxsa,
2672 .policy = macsec_genl_policy,
2673 .flags = GENL_ADMIN_PERM,
2674 },
2675 {
2676 .cmd = MACSEC_CMD_UPD_RXSA,
2677 .doit = macsec_upd_rxsa,
2678 .policy = macsec_genl_policy,
2679 .flags = GENL_ADMIN_PERM,
2680 },
2681 };
2682
2683 static struct genl_family macsec_fam __ro_after_init = {
2684 .name = MACSEC_GENL_NAME,
2685 .hdrsize = 0,
2686 .version = MACSEC_GENL_VERSION,
2687 .maxattr = MACSEC_ATTR_MAX,
2688 .netnsok = true,
2689 .module = THIS_MODULE,
2690 .ops = macsec_genl_ops,
2691 .n_ops = ARRAY_SIZE(macsec_genl_ops),
2692 };
2693
2694 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2695 struct net_device *dev)
2696 {
2697 struct macsec_dev *macsec = netdev_priv(dev);
2698 struct macsec_secy *secy = &macsec->secy;
2699 struct pcpu_secy_stats *secy_stats;
2700 int ret, len;
2701
2702 /* 10.5 */
2703 if (!secy->protect_frames) {
2704 secy_stats = this_cpu_ptr(macsec->stats);
2705 u64_stats_update_begin(&secy_stats->syncp);
2706 secy_stats->stats.OutPktsUntagged++;
2707 u64_stats_update_end(&secy_stats->syncp);
2708 skb->dev = macsec->real_dev;
2709 len = skb->len;
2710 ret = dev_queue_xmit(skb);
2711 count_tx(dev, ret, len);
2712 return ret;
2713 }
2714
2715 if (!secy->operational) {
2716 kfree_skb(skb);
2717 dev->stats.tx_dropped++;
2718 return NETDEV_TX_OK;
2719 }
2720
2721 skb = macsec_encrypt(skb, dev);
2722 if (IS_ERR(skb)) {
2723 if (PTR_ERR(skb) != -EINPROGRESS)
2724 dev->stats.tx_dropped++;
2725 return NETDEV_TX_OK;
2726 }
2727
2728 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2729
2730 macsec_encrypt_finish(skb, dev);
2731 len = skb->len;
2732 ret = dev_queue_xmit(skb);
2733 count_tx(dev, ret, len);
2734 return ret;
2735 }
2736
2737 #define MACSEC_FEATURES \
2738 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2739 static struct lock_class_key macsec_netdev_addr_lock_key;
2740
2741 static int macsec_dev_init(struct net_device *dev)
2742 {
2743 struct macsec_dev *macsec = macsec_priv(dev);
2744 struct net_device *real_dev = macsec->real_dev;
2745 int err;
2746
2747 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2748 if (!dev->tstats)
2749 return -ENOMEM;
2750
2751 err = gro_cells_init(&macsec->gro_cells, dev);
2752 if (err) {
2753 free_percpu(dev->tstats);
2754 return err;
2755 }
2756
2757 dev->features = real_dev->features & MACSEC_FEATURES;
2758 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2759
2760 dev->needed_headroom = real_dev->needed_headroom +
2761 MACSEC_NEEDED_HEADROOM;
2762 dev->needed_tailroom = real_dev->needed_tailroom +
2763 MACSEC_NEEDED_TAILROOM;
2764
2765 if (is_zero_ether_addr(dev->dev_addr))
2766 eth_hw_addr_inherit(dev, real_dev);
2767 if (is_zero_ether_addr(dev->broadcast))
2768 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2769
2770 return 0;
2771 }
2772
2773 static void macsec_dev_uninit(struct net_device *dev)
2774 {
2775 struct macsec_dev *macsec = macsec_priv(dev);
2776
2777 gro_cells_destroy(&macsec->gro_cells);
2778 free_percpu(dev->tstats);
2779 }
2780
2781 static netdev_features_t macsec_fix_features(struct net_device *dev,
2782 netdev_features_t features)
2783 {
2784 struct macsec_dev *macsec = macsec_priv(dev);
2785 struct net_device *real_dev = macsec->real_dev;
2786
2787 features &= (real_dev->features & MACSEC_FEATURES) |
2788 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
2789 features |= NETIF_F_LLTX;
2790
2791 return features;
2792 }
2793
2794 static int macsec_dev_open(struct net_device *dev)
2795 {
2796 struct macsec_dev *macsec = macsec_priv(dev);
2797 struct net_device *real_dev = macsec->real_dev;
2798 int err;
2799
2800 if (!(real_dev->flags & IFF_UP))
2801 return -ENETDOWN;
2802
2803 err = dev_uc_add(real_dev, dev->dev_addr);
2804 if (err < 0)
2805 return err;
2806
2807 if (dev->flags & IFF_ALLMULTI) {
2808 err = dev_set_allmulti(real_dev, 1);
2809 if (err < 0)
2810 goto del_unicast;
2811 }
2812
2813 if (dev->flags & IFF_PROMISC) {
2814 err = dev_set_promiscuity(real_dev, 1);
2815 if (err < 0)
2816 goto clear_allmulti;
2817 }
2818
2819 if (netif_carrier_ok(real_dev))
2820 netif_carrier_on(dev);
2821
2822 return 0;
2823 clear_allmulti:
2824 if (dev->flags & IFF_ALLMULTI)
2825 dev_set_allmulti(real_dev, -1);
2826 del_unicast:
2827 dev_uc_del(real_dev, dev->dev_addr);
2828 netif_carrier_off(dev);
2829 return err;
2830 }
2831
2832 static int macsec_dev_stop(struct net_device *dev)
2833 {
2834 struct macsec_dev *macsec = macsec_priv(dev);
2835 struct net_device *real_dev = macsec->real_dev;
2836
2837 netif_carrier_off(dev);
2838
2839 dev_mc_unsync(real_dev, dev);
2840 dev_uc_unsync(real_dev, dev);
2841
2842 if (dev->flags & IFF_ALLMULTI)
2843 dev_set_allmulti(real_dev, -1);
2844
2845 if (dev->flags & IFF_PROMISC)
2846 dev_set_promiscuity(real_dev, -1);
2847
2848 dev_uc_del(real_dev, dev->dev_addr);
2849
2850 return 0;
2851 }
2852
2853 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2854 {
2855 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2856
2857 if (!(dev->flags & IFF_UP))
2858 return;
2859
2860 if (change & IFF_ALLMULTI)
2861 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2862
2863 if (change & IFF_PROMISC)
2864 dev_set_promiscuity(real_dev,
2865 dev->flags & IFF_PROMISC ? 1 : -1);
2866 }
2867
2868 static void macsec_dev_set_rx_mode(struct net_device *dev)
2869 {
2870 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2871
2872 dev_mc_sync(real_dev, dev);
2873 dev_uc_sync(real_dev, dev);
2874 }
2875
2876 static int macsec_set_mac_address(struct net_device *dev, void *p)
2877 {
2878 struct macsec_dev *macsec = macsec_priv(dev);
2879 struct net_device *real_dev = macsec->real_dev;
2880 struct sockaddr *addr = p;
2881 int err;
2882
2883 if (!is_valid_ether_addr(addr->sa_data))
2884 return -EADDRNOTAVAIL;
2885
2886 if (!(dev->flags & IFF_UP))
2887 goto out;
2888
2889 err = dev_uc_add(real_dev, addr->sa_data);
2890 if (err < 0)
2891 return err;
2892
2893 dev_uc_del(real_dev, dev->dev_addr);
2894
2895 out:
2896 ether_addr_copy(dev->dev_addr, addr->sa_data);
2897 return 0;
2898 }
2899
2900 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2901 {
2902 struct macsec_dev *macsec = macsec_priv(dev);
2903 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2904
2905 if (macsec->real_dev->mtu - extra < new_mtu)
2906 return -ERANGE;
2907
2908 dev->mtu = new_mtu;
2909
2910 return 0;
2911 }
2912
2913 static void macsec_get_stats64(struct net_device *dev,
2914 struct rtnl_link_stats64 *s)
2915 {
2916 int cpu;
2917
2918 if (!dev->tstats)
2919 return;
2920
2921 for_each_possible_cpu(cpu) {
2922 struct pcpu_sw_netstats *stats;
2923 struct pcpu_sw_netstats tmp;
2924 int start;
2925
2926 stats = per_cpu_ptr(dev->tstats, cpu);
2927 do {
2928 start = u64_stats_fetch_begin_irq(&stats->syncp);
2929 tmp.rx_packets = stats->rx_packets;
2930 tmp.rx_bytes = stats->rx_bytes;
2931 tmp.tx_packets = stats->tx_packets;
2932 tmp.tx_bytes = stats->tx_bytes;
2933 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2934
2935 s->rx_packets += tmp.rx_packets;
2936 s->rx_bytes += tmp.rx_bytes;
2937 s->tx_packets += tmp.tx_packets;
2938 s->tx_bytes += tmp.tx_bytes;
2939 }
2940
2941 s->rx_dropped = dev->stats.rx_dropped;
2942 s->tx_dropped = dev->stats.tx_dropped;
2943 }
2944
2945 static int macsec_get_iflink(const struct net_device *dev)
2946 {
2947 return macsec_priv(dev)->real_dev->ifindex;
2948 }
2949
2950
2951 static int macsec_get_nest_level(struct net_device *dev)
2952 {
2953 return macsec_priv(dev)->nest_level;
2954 }
2955
2956
2957 static const struct net_device_ops macsec_netdev_ops = {
2958 .ndo_init = macsec_dev_init,
2959 .ndo_uninit = macsec_dev_uninit,
2960 .ndo_open = macsec_dev_open,
2961 .ndo_stop = macsec_dev_stop,
2962 .ndo_fix_features = macsec_fix_features,
2963 .ndo_change_mtu = macsec_change_mtu,
2964 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2965 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2966 .ndo_set_mac_address = macsec_set_mac_address,
2967 .ndo_start_xmit = macsec_start_xmit,
2968 .ndo_get_stats64 = macsec_get_stats64,
2969 .ndo_get_iflink = macsec_get_iflink,
2970 .ndo_get_lock_subclass = macsec_get_nest_level,
2971 };
2972
2973 static const struct device_type macsec_type = {
2974 .name = "macsec",
2975 };
2976
2977 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2978 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2979 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2980 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2981 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2982 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2983 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2984 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
2985 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
2986 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
2987 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
2988 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
2989 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
2990 };
2991
2992 static void macsec_free_netdev(struct net_device *dev)
2993 {
2994 struct macsec_dev *macsec = macsec_priv(dev);
2995 struct net_device *real_dev = macsec->real_dev;
2996
2997 free_percpu(macsec->stats);
2998 free_percpu(macsec->secy.tx_sc.stats);
2999
3000 dev_put(real_dev);
3001 }
3002
3003 static void macsec_setup(struct net_device *dev)
3004 {
3005 ether_setup(dev);
3006 dev->min_mtu = 0;
3007 dev->max_mtu = ETH_MAX_MTU;
3008 dev->priv_flags |= IFF_NO_QUEUE;
3009 dev->netdev_ops = &macsec_netdev_ops;
3010 dev->needs_free_netdev = true;
3011 dev->priv_destructor = macsec_free_netdev;
3012 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3013
3014 eth_zero_addr(dev->broadcast);
3015 }
3016
3017 static void macsec_changelink_common(struct net_device *dev,
3018 struct nlattr *data[])
3019 {
3020 struct macsec_secy *secy;
3021 struct macsec_tx_sc *tx_sc;
3022
3023 secy = &macsec_priv(dev)->secy;
3024 tx_sc = &secy->tx_sc;
3025
3026 if (data[IFLA_MACSEC_ENCODING_SA]) {
3027 struct macsec_tx_sa *tx_sa;
3028
3029 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3030 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3031
3032 secy->operational = tx_sa && tx_sa->active;
3033 }
3034
3035 if (data[IFLA_MACSEC_WINDOW])
3036 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3037
3038 if (data[IFLA_MACSEC_ENCRYPT])
3039 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3040
3041 if (data[IFLA_MACSEC_PROTECT])
3042 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3043
3044 if (data[IFLA_MACSEC_INC_SCI])
3045 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3046
3047 if (data[IFLA_MACSEC_ES])
3048 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3049
3050 if (data[IFLA_MACSEC_SCB])
3051 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3052
3053 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3054 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3055
3056 if (data[IFLA_MACSEC_VALIDATION])
3057 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3058 }
3059
3060 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3061 struct nlattr *data[],
3062 struct netlink_ext_ack *extack)
3063 {
3064 if (!data)
3065 return 0;
3066
3067 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3068 data[IFLA_MACSEC_ICV_LEN] ||
3069 data[IFLA_MACSEC_SCI] ||
3070 data[IFLA_MACSEC_PORT])
3071 return -EINVAL;
3072
3073 macsec_changelink_common(dev, data);
3074
3075 return 0;
3076 }
3077
3078 static void macsec_del_dev(struct macsec_dev *macsec)
3079 {
3080 int i;
3081
3082 while (macsec->secy.rx_sc) {
3083 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3084
3085 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3086 free_rx_sc(rx_sc);
3087 }
3088
3089 for (i = 0; i < MACSEC_NUM_AN; i++) {
3090 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3091
3092 if (sa) {
3093 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3094 clear_tx_sa(sa);
3095 }
3096 }
3097 }
3098
3099 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3100 {
3101 struct macsec_dev *macsec = macsec_priv(dev);
3102 struct net_device *real_dev = macsec->real_dev;
3103
3104 unregister_netdevice_queue(dev, head);
3105 list_del_rcu(&macsec->secys);
3106 macsec_del_dev(macsec);
3107 netdev_upper_dev_unlink(real_dev, dev);
3108
3109 macsec_generation++;
3110 }
3111
3112 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3113 {
3114 struct macsec_dev *macsec = macsec_priv(dev);
3115 struct net_device *real_dev = macsec->real_dev;
3116 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3117
3118 macsec_common_dellink(dev, head);
3119
3120 if (list_empty(&rxd->secys)) {
3121 netdev_rx_handler_unregister(real_dev);
3122 kfree(rxd);
3123 }
3124 }
3125
3126 static int register_macsec_dev(struct net_device *real_dev,
3127 struct net_device *dev)
3128 {
3129 struct macsec_dev *macsec = macsec_priv(dev);
3130 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3131
3132 if (!rxd) {
3133 int err;
3134
3135 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3136 if (!rxd)
3137 return -ENOMEM;
3138
3139 INIT_LIST_HEAD(&rxd->secys);
3140
3141 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3142 rxd);
3143 if (err < 0) {
3144 kfree(rxd);
3145 return err;
3146 }
3147 }
3148
3149 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3150 return 0;
3151 }
3152
3153 static bool sci_exists(struct net_device *dev, sci_t sci)
3154 {
3155 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3156 struct macsec_dev *macsec;
3157
3158 list_for_each_entry(macsec, &rxd->secys, secys) {
3159 if (macsec->secy.sci == sci)
3160 return true;
3161 }
3162
3163 return false;
3164 }
3165
3166 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3167 {
3168 return make_sci(dev->dev_addr, port);
3169 }
3170
3171 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3172 {
3173 struct macsec_dev *macsec = macsec_priv(dev);
3174 struct macsec_secy *secy = &macsec->secy;
3175
3176 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3177 if (!macsec->stats)
3178 return -ENOMEM;
3179
3180 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3181 if (!secy->tx_sc.stats) {
3182 free_percpu(macsec->stats);
3183 return -ENOMEM;
3184 }
3185
3186 if (sci == MACSEC_UNDEF_SCI)
3187 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3188
3189 secy->netdev = dev;
3190 secy->operational = true;
3191 secy->key_len = DEFAULT_SAK_LEN;
3192 secy->icv_len = icv_len;
3193 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3194 secy->protect_frames = true;
3195 secy->replay_protect = false;
3196
3197 secy->sci = sci;
3198 secy->tx_sc.active = true;
3199 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3200 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3201 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3202 secy->tx_sc.end_station = false;
3203 secy->tx_sc.scb = false;
3204
3205 return 0;
3206 }
3207
3208 static int macsec_newlink(struct net *net, struct net_device *dev,
3209 struct nlattr *tb[], struct nlattr *data[],
3210 struct netlink_ext_ack *extack)
3211 {
3212 struct macsec_dev *macsec = macsec_priv(dev);
3213 struct net_device *real_dev;
3214 int err;
3215 sci_t sci;
3216 u8 icv_len = DEFAULT_ICV_LEN;
3217 rx_handler_func_t *rx_handler;
3218
3219 if (!tb[IFLA_LINK])
3220 return -EINVAL;
3221 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3222 if (!real_dev)
3223 return -ENODEV;
3224
3225 dev->priv_flags |= IFF_MACSEC;
3226
3227 macsec->real_dev = real_dev;
3228
3229 if (data && data[IFLA_MACSEC_ICV_LEN])
3230 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3231 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3232
3233 rx_handler = rtnl_dereference(real_dev->rx_handler);
3234 if (rx_handler && rx_handler != macsec_handle_frame)
3235 return -EBUSY;
3236
3237 err = register_netdevice(dev);
3238 if (err < 0)
3239 return err;
3240
3241 dev_hold(real_dev);
3242
3243 macsec->nest_level = dev_get_nest_level(real_dev) + 1;
3244 netdev_lockdep_set_classes(dev);
3245 lockdep_set_class_and_subclass(&dev->addr_list_lock,
3246 &macsec_netdev_addr_lock_key,
3247 macsec_get_nest_level(dev));
3248
3249 err = netdev_upper_dev_link(real_dev, dev);
3250 if (err < 0)
3251 goto unregister;
3252
3253 /* need to be already registered so that ->init has run and
3254 * the MAC addr is set
3255 */
3256 if (data && data[IFLA_MACSEC_SCI])
3257 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3258 else if (data && data[IFLA_MACSEC_PORT])
3259 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3260 else
3261 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3262
3263 if (rx_handler && sci_exists(real_dev, sci)) {
3264 err = -EBUSY;
3265 goto unlink;
3266 }
3267
3268 err = macsec_add_dev(dev, sci, icv_len);
3269 if (err)
3270 goto unlink;
3271
3272 if (data)
3273 macsec_changelink_common(dev, data);
3274
3275 err = register_macsec_dev(real_dev, dev);
3276 if (err < 0)
3277 goto del_dev;
3278
3279 macsec_generation++;
3280
3281 return 0;
3282
3283 del_dev:
3284 macsec_del_dev(macsec);
3285 unlink:
3286 netdev_upper_dev_unlink(real_dev, dev);
3287 unregister:
3288 unregister_netdevice(dev);
3289 return err;
3290 }
3291
3292 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
3293 struct netlink_ext_ack *extack)
3294 {
3295 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3296 u8 icv_len = DEFAULT_ICV_LEN;
3297 int flag;
3298 bool es, scb, sci;
3299
3300 if (!data)
3301 return 0;
3302
3303 if (data[IFLA_MACSEC_CIPHER_SUITE])
3304 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3305
3306 if (data[IFLA_MACSEC_ICV_LEN]) {
3307 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3308 if (icv_len != DEFAULT_ICV_LEN) {
3309 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
3310 struct crypto_aead *dummy_tfm;
3311
3312 dummy_tfm = macsec_alloc_tfm(dummy_key,
3313 DEFAULT_SAK_LEN,
3314 icv_len);
3315 if (IS_ERR(dummy_tfm))
3316 return PTR_ERR(dummy_tfm);
3317 crypto_free_aead(dummy_tfm);
3318 }
3319 }
3320
3321 switch (csid) {
3322 case MACSEC_DEFAULT_CIPHER_ID:
3323 case MACSEC_DEFAULT_CIPHER_ALT:
3324 if (icv_len < MACSEC_MIN_ICV_LEN ||
3325 icv_len > MACSEC_STD_ICV_LEN)
3326 return -EINVAL;
3327 break;
3328 default:
3329 return -EINVAL;
3330 }
3331
3332 if (data[IFLA_MACSEC_ENCODING_SA]) {
3333 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3334 return -EINVAL;
3335 }
3336
3337 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3338 flag < IFLA_MACSEC_VALIDATION;
3339 flag++) {
3340 if (data[flag]) {
3341 if (nla_get_u8(data[flag]) > 1)
3342 return -EINVAL;
3343 }
3344 }
3345
3346 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3347 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3348 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3349
3350 if ((sci && (scb || es)) || (scb && es))
3351 return -EINVAL;
3352
3353 if (data[IFLA_MACSEC_VALIDATION] &&
3354 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3355 return -EINVAL;
3356
3357 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3358 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3359 !data[IFLA_MACSEC_WINDOW])
3360 return -EINVAL;
3361
3362 return 0;
3363 }
3364
3365 static struct net *macsec_get_link_net(const struct net_device *dev)
3366 {
3367 return dev_net(macsec_priv(dev)->real_dev);
3368 }
3369
3370 static size_t macsec_get_size(const struct net_device *dev)
3371 {
3372 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
3373 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
3374 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
3375 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
3376 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
3377 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
3378 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
3379 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
3380 nla_total_size(1) + /* IFLA_MACSEC_ES */
3381 nla_total_size(1) + /* IFLA_MACSEC_SCB */
3382 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
3383 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
3384 0;
3385 }
3386
3387 static int macsec_fill_info(struct sk_buff *skb,
3388 const struct net_device *dev)
3389 {
3390 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3391 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3392
3393 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
3394 IFLA_MACSEC_PAD) ||
3395 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3396 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
3397 MACSEC_DEFAULT_CIPHER_ID, IFLA_MACSEC_PAD) ||
3398 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3399 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3400 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3401 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3402 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3403 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3404 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3405 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3406 0)
3407 goto nla_put_failure;
3408
3409 if (secy->replay_protect) {
3410 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3411 goto nla_put_failure;
3412 }
3413
3414 return 0;
3415
3416 nla_put_failure:
3417 return -EMSGSIZE;
3418 }
3419
3420 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3421 .kind = "macsec",
3422 .priv_size = sizeof(struct macsec_dev),
3423 .maxtype = IFLA_MACSEC_MAX,
3424 .policy = macsec_rtnl_policy,
3425 .setup = macsec_setup,
3426 .validate = macsec_validate_attr,
3427 .newlink = macsec_newlink,
3428 .changelink = macsec_changelink,
3429 .dellink = macsec_dellink,
3430 .get_size = macsec_get_size,
3431 .fill_info = macsec_fill_info,
3432 .get_link_net = macsec_get_link_net,
3433 };
3434
3435 static bool is_macsec_master(struct net_device *dev)
3436 {
3437 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3438 }
3439
3440 static int macsec_notify(struct notifier_block *this, unsigned long event,
3441 void *ptr)
3442 {
3443 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3444 LIST_HEAD(head);
3445
3446 if (!is_macsec_master(real_dev))
3447 return NOTIFY_DONE;
3448
3449 switch (event) {
3450 case NETDEV_UNREGISTER: {
3451 struct macsec_dev *m, *n;
3452 struct macsec_rxh_data *rxd;
3453
3454 rxd = macsec_data_rtnl(real_dev);
3455 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3456 macsec_common_dellink(m->secy.netdev, &head);
3457 }
3458
3459 netdev_rx_handler_unregister(real_dev);
3460 kfree(rxd);
3461
3462 unregister_netdevice_many(&head);
3463 break;
3464 }
3465 case NETDEV_CHANGEMTU: {
3466 struct macsec_dev *m;
3467 struct macsec_rxh_data *rxd;
3468
3469 rxd = macsec_data_rtnl(real_dev);
3470 list_for_each_entry(m, &rxd->secys, secys) {
3471 struct net_device *dev = m->secy.netdev;
3472 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3473 macsec_extra_len(true));
3474
3475 if (dev->mtu > mtu)
3476 dev_set_mtu(dev, mtu);
3477 }
3478 }
3479 }
3480
3481 return NOTIFY_OK;
3482 }
3483
3484 static struct notifier_block macsec_notifier = {
3485 .notifier_call = macsec_notify,
3486 };
3487
3488 static int __init macsec_init(void)
3489 {
3490 int err;
3491
3492 pr_info("MACsec IEEE 802.1AE\n");
3493 err = register_netdevice_notifier(&macsec_notifier);
3494 if (err)
3495 return err;
3496
3497 err = rtnl_link_register(&macsec_link_ops);
3498 if (err)
3499 goto notifier;
3500
3501 err = genl_register_family(&macsec_fam);
3502 if (err)
3503 goto rtnl;
3504
3505 return 0;
3506
3507 rtnl:
3508 rtnl_link_unregister(&macsec_link_ops);
3509 notifier:
3510 unregister_netdevice_notifier(&macsec_notifier);
3511 return err;
3512 }
3513
3514 static void __exit macsec_exit(void)
3515 {
3516 genl_unregister_family(&macsec_fam);
3517 rtnl_link_unregister(&macsec_link_ops);
3518 unregister_netdevice_notifier(&macsec_notifier);
3519 rcu_barrier();
3520 }
3521
3522 module_init(macsec_init);
3523 module_exit(macsec_exit);
3524
3525 MODULE_ALIAS_RTNL_LINK("macsec");
3526 MODULE_ALIAS_GENL_FAMILY("macsec");
3527
3528 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3529 MODULE_LICENSE("GPL v2");
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