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[mirror_ubuntu-bionic-kernel.git] / drivers / net / macsec.c
1 /*
2 * drivers/net/macsec.c - MACsec device
3 *
4 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12 #include <linux/types.h>
13 #include <linux/skbuff.h>
14 #include <linux/socket.h>
15 #include <linux/module.h>
16 #include <crypto/aead.h>
17 #include <linux/etherdevice.h>
18 #include <linux/rtnetlink.h>
19 #include <linux/refcount.h>
20 #include <net/genetlink.h>
21 #include <net/sock.h>
22 #include <net/gro_cells.h>
23
24 #include <uapi/linux/if_macsec.h>
25
26 typedef u64 __bitwise sci_t;
27
28 #define MACSEC_SCI_LEN 8
29
30 /* SecTAG length = macsec_eth_header without the optional SCI */
31 #define MACSEC_TAG_LEN 6
32
33 struct macsec_eth_header {
34 struct ethhdr eth;
35 /* SecTAG */
36 u8 tci_an;
37 #if defined(__LITTLE_ENDIAN_BITFIELD)
38 u8 short_length:6,
39 unused:2;
40 #elif defined(__BIG_ENDIAN_BITFIELD)
41 u8 unused:2,
42 short_length:6;
43 #else
44 #error "Please fix <asm/byteorder.h>"
45 #endif
46 __be32 packet_number;
47 u8 secure_channel_id[8]; /* optional */
48 } __packed;
49
50 #define MACSEC_TCI_VERSION 0x80
51 #define MACSEC_TCI_ES 0x40 /* end station */
52 #define MACSEC_TCI_SC 0x20 /* SCI present */
53 #define MACSEC_TCI_SCB 0x10 /* epon */
54 #define MACSEC_TCI_E 0x08 /* encryption */
55 #define MACSEC_TCI_C 0x04 /* changed text */
56 #define MACSEC_AN_MASK 0x03 /* association number */
57 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
58
59 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
60 #define MIN_NON_SHORT_LEN 48
61
62 #define GCM_AES_IV_LEN 12
63 #define DEFAULT_ICV_LEN 16
64
65 #define MACSEC_NUM_AN 4 /* 2 bits for the association number */
66
67 #define for_each_rxsc(secy, sc) \
68 for (sc = rcu_dereference_bh(secy->rx_sc); \
69 sc; \
70 sc = rcu_dereference_bh(sc->next))
71 #define for_each_rxsc_rtnl(secy, sc) \
72 for (sc = rtnl_dereference(secy->rx_sc); \
73 sc; \
74 sc = rtnl_dereference(sc->next))
75
76 struct gcm_iv {
77 union {
78 u8 secure_channel_id[8];
79 sci_t sci;
80 };
81 __be32 pn;
82 };
83
84 /**
85 * struct macsec_key - SA key
86 * @id: user-provided key identifier
87 * @tfm: crypto struct, key storage
88 */
89 struct macsec_key {
90 u8 id[MACSEC_KEYID_LEN];
91 struct crypto_aead *tfm;
92 };
93
94 struct macsec_rx_sc_stats {
95 __u64 InOctetsValidated;
96 __u64 InOctetsDecrypted;
97 __u64 InPktsUnchecked;
98 __u64 InPktsDelayed;
99 __u64 InPktsOK;
100 __u64 InPktsInvalid;
101 __u64 InPktsLate;
102 __u64 InPktsNotValid;
103 __u64 InPktsNotUsingSA;
104 __u64 InPktsUnusedSA;
105 };
106
107 struct macsec_rx_sa_stats {
108 __u32 InPktsOK;
109 __u32 InPktsInvalid;
110 __u32 InPktsNotValid;
111 __u32 InPktsNotUsingSA;
112 __u32 InPktsUnusedSA;
113 };
114
115 struct macsec_tx_sa_stats {
116 __u32 OutPktsProtected;
117 __u32 OutPktsEncrypted;
118 };
119
120 struct macsec_tx_sc_stats {
121 __u64 OutPktsProtected;
122 __u64 OutPktsEncrypted;
123 __u64 OutOctetsProtected;
124 __u64 OutOctetsEncrypted;
125 };
126
127 struct macsec_dev_stats {
128 __u64 OutPktsUntagged;
129 __u64 InPktsUntagged;
130 __u64 OutPktsTooLong;
131 __u64 InPktsNoTag;
132 __u64 InPktsBadTag;
133 __u64 InPktsUnknownSCI;
134 __u64 InPktsNoSCI;
135 __u64 InPktsOverrun;
136 };
137
138 /**
139 * struct macsec_rx_sa - receive secure association
140 * @active:
141 * @next_pn: packet number expected for the next packet
142 * @lock: protects next_pn manipulations
143 * @key: key structure
144 * @stats: per-SA stats
145 */
146 struct macsec_rx_sa {
147 struct macsec_key key;
148 spinlock_t lock;
149 u32 next_pn;
150 refcount_t refcnt;
151 bool active;
152 struct macsec_rx_sa_stats __percpu *stats;
153 struct macsec_rx_sc *sc;
154 struct rcu_head rcu;
155 };
156
157 struct pcpu_rx_sc_stats {
158 struct macsec_rx_sc_stats stats;
159 struct u64_stats_sync syncp;
160 };
161
162 /**
163 * struct macsec_rx_sc - receive secure channel
164 * @sci: secure channel identifier for this SC
165 * @active: channel is active
166 * @sa: array of secure associations
167 * @stats: per-SC stats
168 */
169 struct macsec_rx_sc {
170 struct macsec_rx_sc __rcu *next;
171 sci_t sci;
172 bool active;
173 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN];
174 struct pcpu_rx_sc_stats __percpu *stats;
175 refcount_t refcnt;
176 struct rcu_head rcu_head;
177 };
178
179 /**
180 * struct macsec_tx_sa - transmit secure association
181 * @active:
182 * @next_pn: packet number to use for the next packet
183 * @lock: protects next_pn manipulations
184 * @key: key structure
185 * @stats: per-SA stats
186 */
187 struct macsec_tx_sa {
188 struct macsec_key key;
189 spinlock_t lock;
190 u32 next_pn;
191 refcount_t refcnt;
192 bool active;
193 struct macsec_tx_sa_stats __percpu *stats;
194 struct rcu_head rcu;
195 };
196
197 struct pcpu_tx_sc_stats {
198 struct macsec_tx_sc_stats stats;
199 struct u64_stats_sync syncp;
200 };
201
202 /**
203 * struct macsec_tx_sc - transmit secure channel
204 * @active:
205 * @encoding_sa: association number of the SA currently in use
206 * @encrypt: encrypt packets on transmit, or authenticate only
207 * @send_sci: always include the SCI in the SecTAG
208 * @end_station:
209 * @scb: single copy broadcast flag
210 * @sa: array of secure associations
211 * @stats: stats for this TXSC
212 */
213 struct macsec_tx_sc {
214 bool active;
215 u8 encoding_sa;
216 bool encrypt;
217 bool send_sci;
218 bool end_station;
219 bool scb;
220 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN];
221 struct pcpu_tx_sc_stats __percpu *stats;
222 };
223
224 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
225
226 /**
227 * struct macsec_secy - MACsec Security Entity
228 * @netdev: netdevice for this SecY
229 * @n_rx_sc: number of receive secure channels configured on this SecY
230 * @sci: secure channel identifier used for tx
231 * @key_len: length of keys used by the cipher suite
232 * @icv_len: length of ICV used by the cipher suite
233 * @validate_frames: validation mode
234 * @operational: MAC_Operational flag
235 * @protect_frames: enable protection for this SecY
236 * @replay_protect: enable packet number checks on receive
237 * @replay_window: size of the replay window
238 * @tx_sc: transmit secure channel
239 * @rx_sc: linked list of receive secure channels
240 */
241 struct macsec_secy {
242 struct net_device *netdev;
243 unsigned int n_rx_sc;
244 sci_t sci;
245 u16 key_len;
246 u16 icv_len;
247 enum macsec_validation_type validate_frames;
248 bool operational;
249 bool protect_frames;
250 bool replay_protect;
251 u32 replay_window;
252 struct macsec_tx_sc tx_sc;
253 struct macsec_rx_sc __rcu *rx_sc;
254 };
255
256 struct pcpu_secy_stats {
257 struct macsec_dev_stats stats;
258 struct u64_stats_sync syncp;
259 };
260
261 /**
262 * struct macsec_dev - private data
263 * @secy: SecY config
264 * @real_dev: pointer to underlying netdevice
265 * @stats: MACsec device stats
266 * @secys: linked list of SecY's on the underlying device
267 */
268 struct macsec_dev {
269 struct macsec_secy secy;
270 struct net_device *real_dev;
271 struct pcpu_secy_stats __percpu *stats;
272 struct list_head secys;
273 struct gro_cells gro_cells;
274 unsigned int nest_level;
275 };
276
277 /**
278 * struct macsec_rxh_data - rx_handler private argument
279 * @secys: linked list of SecY's on this underlying device
280 */
281 struct macsec_rxh_data {
282 struct list_head secys;
283 };
284
285 static struct macsec_dev *macsec_priv(const struct net_device *dev)
286 {
287 return (struct macsec_dev *)netdev_priv(dev);
288 }
289
290 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
291 {
292 return rcu_dereference_bh(dev->rx_handler_data);
293 }
294
295 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
296 {
297 return rtnl_dereference(dev->rx_handler_data);
298 }
299
300 struct macsec_cb {
301 struct aead_request *req;
302 union {
303 struct macsec_tx_sa *tx_sa;
304 struct macsec_rx_sa *rx_sa;
305 };
306 u8 assoc_num;
307 bool valid;
308 bool has_sci;
309 };
310
311 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
312 {
313 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
314
315 if (!sa || !sa->active)
316 return NULL;
317
318 if (!refcount_inc_not_zero(&sa->refcnt))
319 return NULL;
320
321 return sa;
322 }
323
324 static void free_rx_sc_rcu(struct rcu_head *head)
325 {
326 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
327
328 free_percpu(rx_sc->stats);
329 kfree(rx_sc);
330 }
331
332 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
333 {
334 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
335 }
336
337 static void macsec_rxsc_put(struct macsec_rx_sc *sc)
338 {
339 if (refcount_dec_and_test(&sc->refcnt))
340 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
341 }
342
343 static void free_rxsa(struct rcu_head *head)
344 {
345 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
346
347 crypto_free_aead(sa->key.tfm);
348 free_percpu(sa->stats);
349 kfree(sa);
350 }
351
352 static void macsec_rxsa_put(struct macsec_rx_sa *sa)
353 {
354 if (refcount_dec_and_test(&sa->refcnt))
355 call_rcu(&sa->rcu, free_rxsa);
356 }
357
358 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
359 {
360 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
361
362 if (!sa || !sa->active)
363 return NULL;
364
365 if (!refcount_inc_not_zero(&sa->refcnt))
366 return NULL;
367
368 return sa;
369 }
370
371 static void free_txsa(struct rcu_head *head)
372 {
373 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
374
375 crypto_free_aead(sa->key.tfm);
376 free_percpu(sa->stats);
377 kfree(sa);
378 }
379
380 static void macsec_txsa_put(struct macsec_tx_sa *sa)
381 {
382 if (refcount_dec_and_test(&sa->refcnt))
383 call_rcu(&sa->rcu, free_txsa);
384 }
385
386 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
387 {
388 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
389 return (struct macsec_cb *)skb->cb;
390 }
391
392 #define MACSEC_PORT_ES (htons(0x0001))
393 #define MACSEC_PORT_SCB (0x0000)
394 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
395
396 #define DEFAULT_SAK_LEN 16
397 #define DEFAULT_SEND_SCI true
398 #define DEFAULT_ENCRYPT false
399 #define DEFAULT_ENCODING_SA 0
400
401 static bool send_sci(const struct macsec_secy *secy)
402 {
403 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
404
405 return tx_sc->send_sci ||
406 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
407 }
408
409 static sci_t make_sci(u8 *addr, __be16 port)
410 {
411 sci_t sci;
412
413 memcpy(&sci, addr, ETH_ALEN);
414 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
415
416 return sci;
417 }
418
419 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
420 {
421 sci_t sci;
422
423 if (sci_present)
424 memcpy(&sci, hdr->secure_channel_id,
425 sizeof(hdr->secure_channel_id));
426 else
427 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
428
429 return sci;
430 }
431
432 static unsigned int macsec_sectag_len(bool sci_present)
433 {
434 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
435 }
436
437 static unsigned int macsec_hdr_len(bool sci_present)
438 {
439 return macsec_sectag_len(sci_present) + ETH_HLEN;
440 }
441
442 static unsigned int macsec_extra_len(bool sci_present)
443 {
444 return macsec_sectag_len(sci_present) + sizeof(__be16);
445 }
446
447 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
448 static void macsec_fill_sectag(struct macsec_eth_header *h,
449 const struct macsec_secy *secy, u32 pn,
450 bool sci_present)
451 {
452 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
453
454 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
455 h->eth.h_proto = htons(ETH_P_MACSEC);
456
457 if (sci_present) {
458 h->tci_an |= MACSEC_TCI_SC;
459 memcpy(&h->secure_channel_id, &secy->sci,
460 sizeof(h->secure_channel_id));
461 } else {
462 if (tx_sc->end_station)
463 h->tci_an |= MACSEC_TCI_ES;
464 if (tx_sc->scb)
465 h->tci_an |= MACSEC_TCI_SCB;
466 }
467
468 h->packet_number = htonl(pn);
469
470 /* with GCM, C/E clear for !encrypt, both set for encrypt */
471 if (tx_sc->encrypt)
472 h->tci_an |= MACSEC_TCI_CONFID;
473 else if (secy->icv_len != DEFAULT_ICV_LEN)
474 h->tci_an |= MACSEC_TCI_C;
475
476 h->tci_an |= tx_sc->encoding_sa;
477 }
478
479 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
480 {
481 if (data_len < MIN_NON_SHORT_LEN)
482 h->short_length = data_len;
483 }
484
485 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
486 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
487 {
488 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
489 int len = skb->len - 2 * ETH_ALEN;
490 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
491
492 /* a) It comprises at least 17 octets */
493 if (skb->len <= 16)
494 return false;
495
496 /* b) MACsec EtherType: already checked */
497
498 /* c) V bit is clear */
499 if (h->tci_an & MACSEC_TCI_VERSION)
500 return false;
501
502 /* d) ES or SCB => !SC */
503 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
504 (h->tci_an & MACSEC_TCI_SC))
505 return false;
506
507 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
508 if (h->unused)
509 return false;
510
511 /* rx.pn != 0 (figure 10-5) */
512 if (!h->packet_number)
513 return false;
514
515 /* length check, f) g) h) i) */
516 if (h->short_length)
517 return len == extra_len + h->short_length;
518 return len >= extra_len + MIN_NON_SHORT_LEN;
519 }
520
521 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
522 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
523
524 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
525 {
526 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
527
528 gcm_iv->sci = sci;
529 gcm_iv->pn = htonl(pn);
530 }
531
532 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
533 {
534 return (struct macsec_eth_header *)skb_mac_header(skb);
535 }
536
537 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
538 {
539 u32 pn;
540
541 spin_lock_bh(&tx_sa->lock);
542 pn = tx_sa->next_pn;
543
544 tx_sa->next_pn++;
545 if (tx_sa->next_pn == 0) {
546 pr_debug("PN wrapped, transitioning to !oper\n");
547 tx_sa->active = false;
548 if (secy->protect_frames)
549 secy->operational = false;
550 }
551 spin_unlock_bh(&tx_sa->lock);
552
553 return pn;
554 }
555
556 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
557 {
558 struct macsec_dev *macsec = netdev_priv(dev);
559
560 skb->dev = macsec->real_dev;
561 skb_reset_mac_header(skb);
562 skb->protocol = eth_hdr(skb)->h_proto;
563 }
564
565 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
566 struct macsec_tx_sa *tx_sa)
567 {
568 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
569
570 u64_stats_update_begin(&txsc_stats->syncp);
571 if (tx_sc->encrypt) {
572 txsc_stats->stats.OutOctetsEncrypted += skb->len;
573 txsc_stats->stats.OutPktsEncrypted++;
574 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
575 } else {
576 txsc_stats->stats.OutOctetsProtected += skb->len;
577 txsc_stats->stats.OutPktsProtected++;
578 this_cpu_inc(tx_sa->stats->OutPktsProtected);
579 }
580 u64_stats_update_end(&txsc_stats->syncp);
581 }
582
583 static void count_tx(struct net_device *dev, int ret, int len)
584 {
585 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
586 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
587
588 u64_stats_update_begin(&stats->syncp);
589 stats->tx_packets++;
590 stats->tx_bytes += len;
591 u64_stats_update_end(&stats->syncp);
592 }
593 }
594
595 static void macsec_encrypt_done(struct crypto_async_request *base, int err)
596 {
597 struct sk_buff *skb = base->data;
598 struct net_device *dev = skb->dev;
599 struct macsec_dev *macsec = macsec_priv(dev);
600 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
601 int len, ret;
602
603 aead_request_free(macsec_skb_cb(skb)->req);
604
605 rcu_read_lock_bh();
606 macsec_encrypt_finish(skb, dev);
607 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
608 len = skb->len;
609 ret = dev_queue_xmit(skb);
610 count_tx(dev, ret, len);
611 rcu_read_unlock_bh();
612
613 macsec_txsa_put(sa);
614 dev_put(dev);
615 }
616
617 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
618 unsigned char **iv,
619 struct scatterlist **sg,
620 int num_frags)
621 {
622 size_t size, iv_offset, sg_offset;
623 struct aead_request *req;
624 void *tmp;
625
626 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
627 iv_offset = size;
628 size += GCM_AES_IV_LEN;
629
630 size = ALIGN(size, __alignof__(struct scatterlist));
631 sg_offset = size;
632 size += sizeof(struct scatterlist) * num_frags;
633
634 tmp = kmalloc(size, GFP_ATOMIC);
635 if (!tmp)
636 return NULL;
637
638 *iv = (unsigned char *)(tmp + iv_offset);
639 *sg = (struct scatterlist *)(tmp + sg_offset);
640 req = tmp;
641
642 aead_request_set_tfm(req, tfm);
643
644 return req;
645 }
646
647 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
648 struct net_device *dev)
649 {
650 int ret;
651 struct scatterlist *sg;
652 struct sk_buff *trailer;
653 unsigned char *iv;
654 struct ethhdr *eth;
655 struct macsec_eth_header *hh;
656 size_t unprotected_len;
657 struct aead_request *req;
658 struct macsec_secy *secy;
659 struct macsec_tx_sc *tx_sc;
660 struct macsec_tx_sa *tx_sa;
661 struct macsec_dev *macsec = macsec_priv(dev);
662 bool sci_present;
663 u32 pn;
664
665 secy = &macsec->secy;
666 tx_sc = &secy->tx_sc;
667
668 /* 10.5.1 TX SA assignment */
669 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
670 if (!tx_sa) {
671 secy->operational = false;
672 kfree_skb(skb);
673 return ERR_PTR(-EINVAL);
674 }
675
676 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
677 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
678 struct sk_buff *nskb = skb_copy_expand(skb,
679 MACSEC_NEEDED_HEADROOM,
680 MACSEC_NEEDED_TAILROOM,
681 GFP_ATOMIC);
682 if (likely(nskb)) {
683 consume_skb(skb);
684 skb = nskb;
685 } else {
686 macsec_txsa_put(tx_sa);
687 kfree_skb(skb);
688 return ERR_PTR(-ENOMEM);
689 }
690 } else {
691 skb = skb_unshare(skb, GFP_ATOMIC);
692 if (!skb) {
693 macsec_txsa_put(tx_sa);
694 return ERR_PTR(-ENOMEM);
695 }
696 }
697
698 unprotected_len = skb->len;
699 eth = eth_hdr(skb);
700 sci_present = send_sci(secy);
701 hh = skb_push(skb, macsec_extra_len(sci_present));
702 memmove(hh, eth, 2 * ETH_ALEN);
703
704 pn = tx_sa_update_pn(tx_sa, secy);
705 if (pn == 0) {
706 macsec_txsa_put(tx_sa);
707 kfree_skb(skb);
708 return ERR_PTR(-ENOLINK);
709 }
710 macsec_fill_sectag(hh, secy, pn, sci_present);
711 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
712
713 skb_put(skb, secy->icv_len);
714
715 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
716 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
717
718 u64_stats_update_begin(&secy_stats->syncp);
719 secy_stats->stats.OutPktsTooLong++;
720 u64_stats_update_end(&secy_stats->syncp);
721
722 macsec_txsa_put(tx_sa);
723 kfree_skb(skb);
724 return ERR_PTR(-EINVAL);
725 }
726
727 ret = skb_cow_data(skb, 0, &trailer);
728 if (unlikely(ret < 0)) {
729 macsec_txsa_put(tx_sa);
730 kfree_skb(skb);
731 return ERR_PTR(ret);
732 }
733
734 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
735 if (!req) {
736 macsec_txsa_put(tx_sa);
737 kfree_skb(skb);
738 return ERR_PTR(-ENOMEM);
739 }
740
741 macsec_fill_iv(iv, secy->sci, pn);
742
743 sg_init_table(sg, ret);
744 ret = skb_to_sgvec(skb, sg, 0, skb->len);
745 if (unlikely(ret < 0)) {
746 aead_request_free(req);
747 macsec_txsa_put(tx_sa);
748 kfree_skb(skb);
749 return ERR_PTR(ret);
750 }
751
752 if (tx_sc->encrypt) {
753 int len = skb->len - macsec_hdr_len(sci_present) -
754 secy->icv_len;
755 aead_request_set_crypt(req, sg, sg, len, iv);
756 aead_request_set_ad(req, macsec_hdr_len(sci_present));
757 } else {
758 aead_request_set_crypt(req, sg, sg, 0, iv);
759 aead_request_set_ad(req, skb->len - secy->icv_len);
760 }
761
762 macsec_skb_cb(skb)->req = req;
763 macsec_skb_cb(skb)->tx_sa = tx_sa;
764 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
765
766 dev_hold(skb->dev);
767 ret = crypto_aead_encrypt(req);
768 if (ret == -EINPROGRESS) {
769 return ERR_PTR(ret);
770 } else if (ret != 0) {
771 dev_put(skb->dev);
772 kfree_skb(skb);
773 aead_request_free(req);
774 macsec_txsa_put(tx_sa);
775 return ERR_PTR(-EINVAL);
776 }
777
778 dev_put(skb->dev);
779 aead_request_free(req);
780 macsec_txsa_put(tx_sa);
781
782 return skb;
783 }
784
785 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
786 {
787 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
788 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
789 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
790 u32 lowest_pn = 0;
791
792 spin_lock(&rx_sa->lock);
793 if (rx_sa->next_pn >= secy->replay_window)
794 lowest_pn = rx_sa->next_pn - secy->replay_window;
795
796 /* Now perform replay protection check again
797 * (see IEEE 802.1AE-2006 figure 10-5)
798 */
799 if (secy->replay_protect && pn < lowest_pn) {
800 spin_unlock(&rx_sa->lock);
801 u64_stats_update_begin(&rxsc_stats->syncp);
802 rxsc_stats->stats.InPktsLate++;
803 u64_stats_update_end(&rxsc_stats->syncp);
804 return false;
805 }
806
807 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
808 u64_stats_update_begin(&rxsc_stats->syncp);
809 if (hdr->tci_an & MACSEC_TCI_E)
810 rxsc_stats->stats.InOctetsDecrypted += skb->len;
811 else
812 rxsc_stats->stats.InOctetsValidated += skb->len;
813 u64_stats_update_end(&rxsc_stats->syncp);
814 }
815
816 if (!macsec_skb_cb(skb)->valid) {
817 spin_unlock(&rx_sa->lock);
818
819 /* 10.6.5 */
820 if (hdr->tci_an & MACSEC_TCI_C ||
821 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
822 u64_stats_update_begin(&rxsc_stats->syncp);
823 rxsc_stats->stats.InPktsNotValid++;
824 u64_stats_update_end(&rxsc_stats->syncp);
825 return false;
826 }
827
828 u64_stats_update_begin(&rxsc_stats->syncp);
829 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
830 rxsc_stats->stats.InPktsInvalid++;
831 this_cpu_inc(rx_sa->stats->InPktsInvalid);
832 } else if (pn < lowest_pn) {
833 rxsc_stats->stats.InPktsDelayed++;
834 } else {
835 rxsc_stats->stats.InPktsUnchecked++;
836 }
837 u64_stats_update_end(&rxsc_stats->syncp);
838 } else {
839 u64_stats_update_begin(&rxsc_stats->syncp);
840 if (pn < lowest_pn) {
841 rxsc_stats->stats.InPktsDelayed++;
842 } else {
843 rxsc_stats->stats.InPktsOK++;
844 this_cpu_inc(rx_sa->stats->InPktsOK);
845 }
846 u64_stats_update_end(&rxsc_stats->syncp);
847
848 if (pn >= rx_sa->next_pn)
849 rx_sa->next_pn = pn + 1;
850 spin_unlock(&rx_sa->lock);
851 }
852
853 return true;
854 }
855
856 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
857 {
858 skb->pkt_type = PACKET_HOST;
859 skb->protocol = eth_type_trans(skb, dev);
860
861 skb_reset_network_header(skb);
862 if (!skb_transport_header_was_set(skb))
863 skb_reset_transport_header(skb);
864 skb_reset_mac_len(skb);
865 }
866
867 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
868 {
869 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
870 skb_pull(skb, hdr_len);
871 pskb_trim_unique(skb, skb->len - icv_len);
872 }
873
874 static void count_rx(struct net_device *dev, int len)
875 {
876 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
877
878 u64_stats_update_begin(&stats->syncp);
879 stats->rx_packets++;
880 stats->rx_bytes += len;
881 u64_stats_update_end(&stats->syncp);
882 }
883
884 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
885 {
886 struct sk_buff *skb = base->data;
887 struct net_device *dev = skb->dev;
888 struct macsec_dev *macsec = macsec_priv(dev);
889 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
890 struct macsec_rx_sc *rx_sc = rx_sa->sc;
891 int len;
892 u32 pn;
893
894 aead_request_free(macsec_skb_cb(skb)->req);
895
896 if (!err)
897 macsec_skb_cb(skb)->valid = true;
898
899 rcu_read_lock_bh();
900 pn = ntohl(macsec_ethhdr(skb)->packet_number);
901 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
902 rcu_read_unlock_bh();
903 kfree_skb(skb);
904 goto out;
905 }
906
907 macsec_finalize_skb(skb, macsec->secy.icv_len,
908 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
909 macsec_reset_skb(skb, macsec->secy.netdev);
910
911 len = skb->len;
912 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
913 count_rx(dev, len);
914
915 rcu_read_unlock_bh();
916
917 out:
918 macsec_rxsa_put(rx_sa);
919 macsec_rxsc_put(rx_sc);
920 dev_put(dev);
921 }
922
923 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
924 struct net_device *dev,
925 struct macsec_rx_sa *rx_sa,
926 sci_t sci,
927 struct macsec_secy *secy)
928 {
929 int ret;
930 struct scatterlist *sg;
931 struct sk_buff *trailer;
932 unsigned char *iv;
933 struct aead_request *req;
934 struct macsec_eth_header *hdr;
935 u16 icv_len = secy->icv_len;
936
937 macsec_skb_cb(skb)->valid = false;
938 skb = skb_share_check(skb, GFP_ATOMIC);
939 if (!skb)
940 return ERR_PTR(-ENOMEM);
941
942 ret = skb_cow_data(skb, 0, &trailer);
943 if (unlikely(ret < 0)) {
944 kfree_skb(skb);
945 return ERR_PTR(ret);
946 }
947 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
948 if (!req) {
949 kfree_skb(skb);
950 return ERR_PTR(-ENOMEM);
951 }
952
953 hdr = (struct macsec_eth_header *)skb->data;
954 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
955
956 sg_init_table(sg, ret);
957 ret = skb_to_sgvec(skb, sg, 0, skb->len);
958 if (unlikely(ret < 0)) {
959 aead_request_free(req);
960 kfree_skb(skb);
961 return ERR_PTR(ret);
962 }
963
964 if (hdr->tci_an & MACSEC_TCI_E) {
965 /* confidentiality: ethernet + macsec header
966 * authenticated, encrypted payload
967 */
968 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
969
970 aead_request_set_crypt(req, sg, sg, len, iv);
971 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
972 skb = skb_unshare(skb, GFP_ATOMIC);
973 if (!skb) {
974 aead_request_free(req);
975 return ERR_PTR(-ENOMEM);
976 }
977 } else {
978 /* integrity only: all headers + data authenticated */
979 aead_request_set_crypt(req, sg, sg, icv_len, iv);
980 aead_request_set_ad(req, skb->len - icv_len);
981 }
982
983 macsec_skb_cb(skb)->req = req;
984 skb->dev = dev;
985 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
986
987 dev_hold(dev);
988 ret = crypto_aead_decrypt(req);
989 if (ret == -EINPROGRESS) {
990 return ERR_PTR(ret);
991 } else if (ret != 0) {
992 /* decryption/authentication failed
993 * 10.6 if validateFrames is disabled, deliver anyway
994 */
995 if (ret != -EBADMSG) {
996 kfree_skb(skb);
997 skb = ERR_PTR(ret);
998 }
999 } else {
1000 macsec_skb_cb(skb)->valid = true;
1001 }
1002 dev_put(dev);
1003
1004 aead_request_free(req);
1005
1006 return skb;
1007 }
1008
1009 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
1010 {
1011 struct macsec_rx_sc *rx_sc;
1012
1013 for_each_rxsc(secy, rx_sc) {
1014 if (rx_sc->sci == sci)
1015 return rx_sc;
1016 }
1017
1018 return NULL;
1019 }
1020
1021 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
1022 {
1023 struct macsec_rx_sc *rx_sc;
1024
1025 for_each_rxsc_rtnl(secy, rx_sc) {
1026 if (rx_sc->sci == sci)
1027 return rx_sc;
1028 }
1029
1030 return NULL;
1031 }
1032
1033 static void handle_not_macsec(struct sk_buff *skb)
1034 {
1035 struct macsec_rxh_data *rxd;
1036 struct macsec_dev *macsec;
1037
1038 rcu_read_lock();
1039 rxd = macsec_data_rcu(skb->dev);
1040
1041 /* 10.6 If the management control validateFrames is not
1042 * Strict, frames without a SecTAG are received, counted, and
1043 * delivered to the Controlled Port
1044 */
1045 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1046 struct sk_buff *nskb;
1047 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1048
1049 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1050 u64_stats_update_begin(&secy_stats->syncp);
1051 secy_stats->stats.InPktsNoTag++;
1052 u64_stats_update_end(&secy_stats->syncp);
1053 continue;
1054 }
1055
1056 /* deliver on this port */
1057 nskb = skb_clone(skb, GFP_ATOMIC);
1058 if (!nskb)
1059 break;
1060
1061 nskb->dev = macsec->secy.netdev;
1062
1063 if (netif_rx(nskb) == NET_RX_SUCCESS) {
1064 u64_stats_update_begin(&secy_stats->syncp);
1065 secy_stats->stats.InPktsUntagged++;
1066 u64_stats_update_end(&secy_stats->syncp);
1067 }
1068 }
1069
1070 rcu_read_unlock();
1071 }
1072
1073 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1074 {
1075 struct sk_buff *skb = *pskb;
1076 struct net_device *dev = skb->dev;
1077 struct macsec_eth_header *hdr;
1078 struct macsec_secy *secy = NULL;
1079 struct macsec_rx_sc *rx_sc;
1080 struct macsec_rx_sa *rx_sa;
1081 struct macsec_rxh_data *rxd;
1082 struct macsec_dev *macsec;
1083 sci_t sci;
1084 u32 pn;
1085 bool cbit;
1086 struct pcpu_rx_sc_stats *rxsc_stats;
1087 struct pcpu_secy_stats *secy_stats;
1088 bool pulled_sci;
1089 int ret;
1090
1091 if (skb_headroom(skb) < ETH_HLEN)
1092 goto drop_direct;
1093
1094 hdr = macsec_ethhdr(skb);
1095 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1096 handle_not_macsec(skb);
1097
1098 /* and deliver to the uncontrolled port */
1099 return RX_HANDLER_PASS;
1100 }
1101
1102 skb = skb_unshare(skb, GFP_ATOMIC);
1103 if (!skb) {
1104 *pskb = NULL;
1105 return RX_HANDLER_CONSUMED;
1106 }
1107
1108 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1109 if (!pulled_sci) {
1110 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1111 goto drop_direct;
1112 }
1113
1114 hdr = macsec_ethhdr(skb);
1115
1116 /* Frames with a SecTAG that has the TCI E bit set but the C
1117 * bit clear are discarded, as this reserved encoding is used
1118 * to identify frames with a SecTAG that are not to be
1119 * delivered to the Controlled Port.
1120 */
1121 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1122 return RX_HANDLER_PASS;
1123
1124 /* now, pull the extra length */
1125 if (hdr->tci_an & MACSEC_TCI_SC) {
1126 if (!pulled_sci)
1127 goto drop_direct;
1128 }
1129
1130 /* ethernet header is part of crypto processing */
1131 skb_push(skb, ETH_HLEN);
1132
1133 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1134 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1135 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1136
1137 rcu_read_lock();
1138 rxd = macsec_data_rcu(skb->dev);
1139
1140 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1141 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1142 sc = sc ? macsec_rxsc_get(sc) : NULL;
1143
1144 if (sc) {
1145 secy = &macsec->secy;
1146 rx_sc = sc;
1147 break;
1148 }
1149 }
1150
1151 if (!secy)
1152 goto nosci;
1153
1154 dev = secy->netdev;
1155 macsec = macsec_priv(dev);
1156 secy_stats = this_cpu_ptr(macsec->stats);
1157 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1158
1159 if (!macsec_validate_skb(skb, secy->icv_len)) {
1160 u64_stats_update_begin(&secy_stats->syncp);
1161 secy_stats->stats.InPktsBadTag++;
1162 u64_stats_update_end(&secy_stats->syncp);
1163 goto drop_nosa;
1164 }
1165
1166 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1167 if (!rx_sa) {
1168 /* 10.6.1 if the SA is not in use */
1169
1170 /* If validateFrames is Strict or the C bit in the
1171 * SecTAG is set, discard
1172 */
1173 if (hdr->tci_an & MACSEC_TCI_C ||
1174 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1175 u64_stats_update_begin(&rxsc_stats->syncp);
1176 rxsc_stats->stats.InPktsNotUsingSA++;
1177 u64_stats_update_end(&rxsc_stats->syncp);
1178 goto drop_nosa;
1179 }
1180
1181 /* not Strict, the frame (with the SecTAG and ICV
1182 * removed) is delivered to the Controlled Port.
1183 */
1184 u64_stats_update_begin(&rxsc_stats->syncp);
1185 rxsc_stats->stats.InPktsUnusedSA++;
1186 u64_stats_update_end(&rxsc_stats->syncp);
1187 goto deliver;
1188 }
1189
1190 /* First, PN check to avoid decrypting obviously wrong packets */
1191 pn = ntohl(hdr->packet_number);
1192 if (secy->replay_protect) {
1193 bool late;
1194
1195 spin_lock(&rx_sa->lock);
1196 late = rx_sa->next_pn >= secy->replay_window &&
1197 pn < (rx_sa->next_pn - secy->replay_window);
1198 spin_unlock(&rx_sa->lock);
1199
1200 if (late) {
1201 u64_stats_update_begin(&rxsc_stats->syncp);
1202 rxsc_stats->stats.InPktsLate++;
1203 u64_stats_update_end(&rxsc_stats->syncp);
1204 goto drop;
1205 }
1206 }
1207
1208 macsec_skb_cb(skb)->rx_sa = rx_sa;
1209
1210 /* Disabled && !changed text => skip validation */
1211 if (hdr->tci_an & MACSEC_TCI_C ||
1212 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1213 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1214
1215 if (IS_ERR(skb)) {
1216 /* the decrypt callback needs the reference */
1217 if (PTR_ERR(skb) != -EINPROGRESS) {
1218 macsec_rxsa_put(rx_sa);
1219 macsec_rxsc_put(rx_sc);
1220 }
1221 rcu_read_unlock();
1222 *pskb = NULL;
1223 return RX_HANDLER_CONSUMED;
1224 }
1225
1226 if (!macsec_post_decrypt(skb, secy, pn))
1227 goto drop;
1228
1229 deliver:
1230 macsec_finalize_skb(skb, secy->icv_len,
1231 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1232 macsec_reset_skb(skb, secy->netdev);
1233
1234 if (rx_sa)
1235 macsec_rxsa_put(rx_sa);
1236 macsec_rxsc_put(rx_sc);
1237
1238 ret = gro_cells_receive(&macsec->gro_cells, skb);
1239 if (ret == NET_RX_SUCCESS)
1240 count_rx(dev, skb->len);
1241 else
1242 macsec->secy.netdev->stats.rx_dropped++;
1243
1244 rcu_read_unlock();
1245
1246 *pskb = NULL;
1247 return RX_HANDLER_CONSUMED;
1248
1249 drop:
1250 macsec_rxsa_put(rx_sa);
1251 drop_nosa:
1252 macsec_rxsc_put(rx_sc);
1253 rcu_read_unlock();
1254 drop_direct:
1255 kfree_skb(skb);
1256 *pskb = NULL;
1257 return RX_HANDLER_CONSUMED;
1258
1259 nosci:
1260 /* 10.6.1 if the SC is not found */
1261 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1262 if (!cbit)
1263 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1264 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1265
1266 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1267 struct sk_buff *nskb;
1268
1269 secy_stats = this_cpu_ptr(macsec->stats);
1270
1271 /* If validateFrames is Strict or the C bit in the
1272 * SecTAG is set, discard
1273 */
1274 if (cbit ||
1275 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1276 u64_stats_update_begin(&secy_stats->syncp);
1277 secy_stats->stats.InPktsNoSCI++;
1278 u64_stats_update_end(&secy_stats->syncp);
1279 continue;
1280 }
1281
1282 /* not strict, the frame (with the SecTAG and ICV
1283 * removed) is delivered to the Controlled Port.
1284 */
1285 nskb = skb_clone(skb, GFP_ATOMIC);
1286 if (!nskb)
1287 break;
1288
1289 macsec_reset_skb(nskb, macsec->secy.netdev);
1290
1291 ret = netif_rx(nskb);
1292 if (ret == NET_RX_SUCCESS) {
1293 u64_stats_update_begin(&secy_stats->syncp);
1294 secy_stats->stats.InPktsUnknownSCI++;
1295 u64_stats_update_end(&secy_stats->syncp);
1296 } else {
1297 macsec->secy.netdev->stats.rx_dropped++;
1298 }
1299 }
1300
1301 rcu_read_unlock();
1302 *pskb = skb;
1303 return RX_HANDLER_PASS;
1304 }
1305
1306 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1307 {
1308 struct crypto_aead *tfm;
1309 int ret;
1310
1311 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1312
1313 if (IS_ERR(tfm))
1314 return tfm;
1315
1316 ret = crypto_aead_setkey(tfm, key, key_len);
1317 if (ret < 0)
1318 goto fail;
1319
1320 ret = crypto_aead_setauthsize(tfm, icv_len);
1321 if (ret < 0)
1322 goto fail;
1323
1324 return tfm;
1325 fail:
1326 crypto_free_aead(tfm);
1327 return ERR_PTR(ret);
1328 }
1329
1330 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1331 int icv_len)
1332 {
1333 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1334 if (!rx_sa->stats)
1335 return -ENOMEM;
1336
1337 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1338 if (IS_ERR(rx_sa->key.tfm)) {
1339 free_percpu(rx_sa->stats);
1340 return PTR_ERR(rx_sa->key.tfm);
1341 }
1342
1343 rx_sa->active = false;
1344 rx_sa->next_pn = 1;
1345 refcount_set(&rx_sa->refcnt, 1);
1346 spin_lock_init(&rx_sa->lock);
1347
1348 return 0;
1349 }
1350
1351 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1352 {
1353 rx_sa->active = false;
1354
1355 macsec_rxsa_put(rx_sa);
1356 }
1357
1358 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1359 {
1360 int i;
1361
1362 for (i = 0; i < MACSEC_NUM_AN; i++) {
1363 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1364
1365 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1366 if (sa)
1367 clear_rx_sa(sa);
1368 }
1369
1370 macsec_rxsc_put(rx_sc);
1371 }
1372
1373 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1374 {
1375 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1376
1377 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1378 rx_sc;
1379 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1380 if (rx_sc->sci == sci) {
1381 if (rx_sc->active)
1382 secy->n_rx_sc--;
1383 rcu_assign_pointer(*rx_scp, rx_sc->next);
1384 return rx_sc;
1385 }
1386 }
1387
1388 return NULL;
1389 }
1390
1391 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1392 {
1393 struct macsec_rx_sc *rx_sc;
1394 struct macsec_dev *macsec;
1395 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1396 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1397 struct macsec_secy *secy;
1398
1399 list_for_each_entry(macsec, &rxd->secys, secys) {
1400 if (find_rx_sc_rtnl(&macsec->secy, sci))
1401 return ERR_PTR(-EEXIST);
1402 }
1403
1404 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1405 if (!rx_sc)
1406 return ERR_PTR(-ENOMEM);
1407
1408 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1409 if (!rx_sc->stats) {
1410 kfree(rx_sc);
1411 return ERR_PTR(-ENOMEM);
1412 }
1413
1414 rx_sc->sci = sci;
1415 rx_sc->active = true;
1416 refcount_set(&rx_sc->refcnt, 1);
1417
1418 secy = &macsec_priv(dev)->secy;
1419 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1420 rcu_assign_pointer(secy->rx_sc, rx_sc);
1421
1422 if (rx_sc->active)
1423 secy->n_rx_sc++;
1424
1425 return rx_sc;
1426 }
1427
1428 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1429 int icv_len)
1430 {
1431 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1432 if (!tx_sa->stats)
1433 return -ENOMEM;
1434
1435 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1436 if (IS_ERR(tx_sa->key.tfm)) {
1437 free_percpu(tx_sa->stats);
1438 return PTR_ERR(tx_sa->key.tfm);
1439 }
1440
1441 tx_sa->active = false;
1442 refcount_set(&tx_sa->refcnt, 1);
1443 spin_lock_init(&tx_sa->lock);
1444
1445 return 0;
1446 }
1447
1448 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1449 {
1450 tx_sa->active = false;
1451
1452 macsec_txsa_put(tx_sa);
1453 }
1454
1455 static struct genl_family macsec_fam;
1456
1457 static struct net_device *get_dev_from_nl(struct net *net,
1458 struct nlattr **attrs)
1459 {
1460 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1461 struct net_device *dev;
1462
1463 dev = __dev_get_by_index(net, ifindex);
1464 if (!dev)
1465 return ERR_PTR(-ENODEV);
1466
1467 if (!netif_is_macsec(dev))
1468 return ERR_PTR(-ENODEV);
1469
1470 return dev;
1471 }
1472
1473 static sci_t nla_get_sci(const struct nlattr *nla)
1474 {
1475 return (__force sci_t)nla_get_u64(nla);
1476 }
1477
1478 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1479 int padattr)
1480 {
1481 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1482 }
1483
1484 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1485 struct nlattr **attrs,
1486 struct nlattr **tb_sa,
1487 struct net_device **devp,
1488 struct macsec_secy **secyp,
1489 struct macsec_tx_sc **scp,
1490 u8 *assoc_num)
1491 {
1492 struct net_device *dev;
1493 struct macsec_secy *secy;
1494 struct macsec_tx_sc *tx_sc;
1495 struct macsec_tx_sa *tx_sa;
1496
1497 if (!tb_sa[MACSEC_SA_ATTR_AN])
1498 return ERR_PTR(-EINVAL);
1499
1500 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1501
1502 dev = get_dev_from_nl(net, attrs);
1503 if (IS_ERR(dev))
1504 return ERR_CAST(dev);
1505
1506 if (*assoc_num >= MACSEC_NUM_AN)
1507 return ERR_PTR(-EINVAL);
1508
1509 secy = &macsec_priv(dev)->secy;
1510 tx_sc = &secy->tx_sc;
1511
1512 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1513 if (!tx_sa)
1514 return ERR_PTR(-ENODEV);
1515
1516 *devp = dev;
1517 *scp = tx_sc;
1518 *secyp = secy;
1519 return tx_sa;
1520 }
1521
1522 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1523 struct nlattr **attrs,
1524 struct nlattr **tb_rxsc,
1525 struct net_device **devp,
1526 struct macsec_secy **secyp)
1527 {
1528 struct net_device *dev;
1529 struct macsec_secy *secy;
1530 struct macsec_rx_sc *rx_sc;
1531 sci_t sci;
1532
1533 dev = get_dev_from_nl(net, attrs);
1534 if (IS_ERR(dev))
1535 return ERR_CAST(dev);
1536
1537 secy = &macsec_priv(dev)->secy;
1538
1539 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1540 return ERR_PTR(-EINVAL);
1541
1542 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1543 rx_sc = find_rx_sc_rtnl(secy, sci);
1544 if (!rx_sc)
1545 return ERR_PTR(-ENODEV);
1546
1547 *secyp = secy;
1548 *devp = dev;
1549
1550 return rx_sc;
1551 }
1552
1553 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1554 struct nlattr **attrs,
1555 struct nlattr **tb_rxsc,
1556 struct nlattr **tb_sa,
1557 struct net_device **devp,
1558 struct macsec_secy **secyp,
1559 struct macsec_rx_sc **scp,
1560 u8 *assoc_num)
1561 {
1562 struct macsec_rx_sc *rx_sc;
1563 struct macsec_rx_sa *rx_sa;
1564
1565 if (!tb_sa[MACSEC_SA_ATTR_AN])
1566 return ERR_PTR(-EINVAL);
1567
1568 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1569 if (*assoc_num >= MACSEC_NUM_AN)
1570 return ERR_PTR(-EINVAL);
1571
1572 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1573 if (IS_ERR(rx_sc))
1574 return ERR_CAST(rx_sc);
1575
1576 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1577 if (!rx_sa)
1578 return ERR_PTR(-ENODEV);
1579
1580 *scp = rx_sc;
1581 return rx_sa;
1582 }
1583
1584
1585 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1586 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1587 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1588 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1589 };
1590
1591 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1592 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1593 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1594 };
1595
1596 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1597 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1598 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1599 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1600 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1601 .len = MACSEC_KEYID_LEN, },
1602 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1603 .len = MACSEC_MAX_KEY_LEN, },
1604 };
1605
1606 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1607 {
1608 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1609 return -EINVAL;
1610
1611 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX,
1612 attrs[MACSEC_ATTR_SA_CONFIG],
1613 macsec_genl_sa_policy, NULL))
1614 return -EINVAL;
1615
1616 return 0;
1617 }
1618
1619 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1620 {
1621 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1622 return -EINVAL;
1623
1624 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX,
1625 attrs[MACSEC_ATTR_RXSC_CONFIG],
1626 macsec_genl_rxsc_policy, NULL))
1627 return -EINVAL;
1628
1629 return 0;
1630 }
1631
1632 static bool validate_add_rxsa(struct nlattr **attrs)
1633 {
1634 if (!attrs[MACSEC_SA_ATTR_AN] ||
1635 !attrs[MACSEC_SA_ATTR_KEY] ||
1636 !attrs[MACSEC_SA_ATTR_KEYID])
1637 return false;
1638
1639 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1640 return false;
1641
1642 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1643 return false;
1644
1645 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1646 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1647 return false;
1648 }
1649
1650 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1651 return false;
1652
1653 return true;
1654 }
1655
1656 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1657 {
1658 struct net_device *dev;
1659 struct nlattr **attrs = info->attrs;
1660 struct macsec_secy *secy;
1661 struct macsec_rx_sc *rx_sc;
1662 struct macsec_rx_sa *rx_sa;
1663 unsigned char assoc_num;
1664 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1665 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1666 int err;
1667
1668 if (!attrs[MACSEC_ATTR_IFINDEX])
1669 return -EINVAL;
1670
1671 if (parse_sa_config(attrs, tb_sa))
1672 return -EINVAL;
1673
1674 if (parse_rxsc_config(attrs, tb_rxsc))
1675 return -EINVAL;
1676
1677 if (!validate_add_rxsa(tb_sa))
1678 return -EINVAL;
1679
1680 rtnl_lock();
1681 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1682 if (IS_ERR(rx_sc)) {
1683 rtnl_unlock();
1684 return PTR_ERR(rx_sc);
1685 }
1686
1687 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1688
1689 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1690 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1691 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1692 rtnl_unlock();
1693 return -EINVAL;
1694 }
1695
1696 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1697 if (rx_sa) {
1698 rtnl_unlock();
1699 return -EBUSY;
1700 }
1701
1702 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1703 if (!rx_sa) {
1704 rtnl_unlock();
1705 return -ENOMEM;
1706 }
1707
1708 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1709 secy->key_len, secy->icv_len);
1710 if (err < 0) {
1711 kfree(rx_sa);
1712 rtnl_unlock();
1713 return err;
1714 }
1715
1716 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1717 spin_lock_bh(&rx_sa->lock);
1718 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1719 spin_unlock_bh(&rx_sa->lock);
1720 }
1721
1722 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1723 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1724
1725 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1726 rx_sa->sc = rx_sc;
1727 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1728
1729 rtnl_unlock();
1730
1731 return 0;
1732 }
1733
1734 static bool validate_add_rxsc(struct nlattr **attrs)
1735 {
1736 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1737 return false;
1738
1739 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1740 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1741 return false;
1742 }
1743
1744 return true;
1745 }
1746
1747 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1748 {
1749 struct net_device *dev;
1750 sci_t sci = MACSEC_UNDEF_SCI;
1751 struct nlattr **attrs = info->attrs;
1752 struct macsec_rx_sc *rx_sc;
1753 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1754
1755 if (!attrs[MACSEC_ATTR_IFINDEX])
1756 return -EINVAL;
1757
1758 if (parse_rxsc_config(attrs, tb_rxsc))
1759 return -EINVAL;
1760
1761 if (!validate_add_rxsc(tb_rxsc))
1762 return -EINVAL;
1763
1764 rtnl_lock();
1765 dev = get_dev_from_nl(genl_info_net(info), attrs);
1766 if (IS_ERR(dev)) {
1767 rtnl_unlock();
1768 return PTR_ERR(dev);
1769 }
1770
1771 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1772
1773 rx_sc = create_rx_sc(dev, sci);
1774 if (IS_ERR(rx_sc)) {
1775 rtnl_unlock();
1776 return PTR_ERR(rx_sc);
1777 }
1778
1779 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1780 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1781
1782 rtnl_unlock();
1783
1784 return 0;
1785 }
1786
1787 static bool validate_add_txsa(struct nlattr **attrs)
1788 {
1789 if (!attrs[MACSEC_SA_ATTR_AN] ||
1790 !attrs[MACSEC_SA_ATTR_PN] ||
1791 !attrs[MACSEC_SA_ATTR_KEY] ||
1792 !attrs[MACSEC_SA_ATTR_KEYID])
1793 return false;
1794
1795 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1796 return false;
1797
1798 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1799 return false;
1800
1801 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1802 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1803 return false;
1804 }
1805
1806 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1807 return false;
1808
1809 return true;
1810 }
1811
1812 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1813 {
1814 struct net_device *dev;
1815 struct nlattr **attrs = info->attrs;
1816 struct macsec_secy *secy;
1817 struct macsec_tx_sc *tx_sc;
1818 struct macsec_tx_sa *tx_sa;
1819 unsigned char assoc_num;
1820 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1821 int err;
1822
1823 if (!attrs[MACSEC_ATTR_IFINDEX])
1824 return -EINVAL;
1825
1826 if (parse_sa_config(attrs, tb_sa))
1827 return -EINVAL;
1828
1829 if (!validate_add_txsa(tb_sa))
1830 return -EINVAL;
1831
1832 rtnl_lock();
1833 dev = get_dev_from_nl(genl_info_net(info), attrs);
1834 if (IS_ERR(dev)) {
1835 rtnl_unlock();
1836 return PTR_ERR(dev);
1837 }
1838
1839 secy = &macsec_priv(dev)->secy;
1840 tx_sc = &secy->tx_sc;
1841
1842 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1843
1844 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1845 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1846 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1847 rtnl_unlock();
1848 return -EINVAL;
1849 }
1850
1851 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1852 if (tx_sa) {
1853 rtnl_unlock();
1854 return -EBUSY;
1855 }
1856
1857 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1858 if (!tx_sa) {
1859 rtnl_unlock();
1860 return -ENOMEM;
1861 }
1862
1863 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1864 secy->key_len, secy->icv_len);
1865 if (err < 0) {
1866 kfree(tx_sa);
1867 rtnl_unlock();
1868 return err;
1869 }
1870
1871 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1872
1873 spin_lock_bh(&tx_sa->lock);
1874 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1875 spin_unlock_bh(&tx_sa->lock);
1876
1877 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1878 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1879
1880 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1881 secy->operational = true;
1882
1883 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1884
1885 rtnl_unlock();
1886
1887 return 0;
1888 }
1889
1890 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1891 {
1892 struct nlattr **attrs = info->attrs;
1893 struct net_device *dev;
1894 struct macsec_secy *secy;
1895 struct macsec_rx_sc *rx_sc;
1896 struct macsec_rx_sa *rx_sa;
1897 u8 assoc_num;
1898 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1899 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1900
1901 if (!attrs[MACSEC_ATTR_IFINDEX])
1902 return -EINVAL;
1903
1904 if (parse_sa_config(attrs, tb_sa))
1905 return -EINVAL;
1906
1907 if (parse_rxsc_config(attrs, tb_rxsc))
1908 return -EINVAL;
1909
1910 rtnl_lock();
1911 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1912 &dev, &secy, &rx_sc, &assoc_num);
1913 if (IS_ERR(rx_sa)) {
1914 rtnl_unlock();
1915 return PTR_ERR(rx_sa);
1916 }
1917
1918 if (rx_sa->active) {
1919 rtnl_unlock();
1920 return -EBUSY;
1921 }
1922
1923 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1924 clear_rx_sa(rx_sa);
1925
1926 rtnl_unlock();
1927
1928 return 0;
1929 }
1930
1931 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1932 {
1933 struct nlattr **attrs = info->attrs;
1934 struct net_device *dev;
1935 struct macsec_secy *secy;
1936 struct macsec_rx_sc *rx_sc;
1937 sci_t sci;
1938 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1939
1940 if (!attrs[MACSEC_ATTR_IFINDEX])
1941 return -EINVAL;
1942
1943 if (parse_rxsc_config(attrs, tb_rxsc))
1944 return -EINVAL;
1945
1946 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1947 return -EINVAL;
1948
1949 rtnl_lock();
1950 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1951 if (IS_ERR(dev)) {
1952 rtnl_unlock();
1953 return PTR_ERR(dev);
1954 }
1955
1956 secy = &macsec_priv(dev)->secy;
1957 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1958
1959 rx_sc = del_rx_sc(secy, sci);
1960 if (!rx_sc) {
1961 rtnl_unlock();
1962 return -ENODEV;
1963 }
1964
1965 free_rx_sc(rx_sc);
1966 rtnl_unlock();
1967
1968 return 0;
1969 }
1970
1971 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1972 {
1973 struct nlattr **attrs = info->attrs;
1974 struct net_device *dev;
1975 struct macsec_secy *secy;
1976 struct macsec_tx_sc *tx_sc;
1977 struct macsec_tx_sa *tx_sa;
1978 u8 assoc_num;
1979 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1980
1981 if (!attrs[MACSEC_ATTR_IFINDEX])
1982 return -EINVAL;
1983
1984 if (parse_sa_config(attrs, tb_sa))
1985 return -EINVAL;
1986
1987 rtnl_lock();
1988 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1989 &dev, &secy, &tx_sc, &assoc_num);
1990 if (IS_ERR(tx_sa)) {
1991 rtnl_unlock();
1992 return PTR_ERR(tx_sa);
1993 }
1994
1995 if (tx_sa->active) {
1996 rtnl_unlock();
1997 return -EBUSY;
1998 }
1999
2000 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2001 clear_tx_sa(tx_sa);
2002
2003 rtnl_unlock();
2004
2005 return 0;
2006 }
2007
2008 static bool validate_upd_sa(struct nlattr **attrs)
2009 {
2010 if (!attrs[MACSEC_SA_ATTR_AN] ||
2011 attrs[MACSEC_SA_ATTR_KEY] ||
2012 attrs[MACSEC_SA_ATTR_KEYID])
2013 return false;
2014
2015 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2016 return false;
2017
2018 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
2019 return false;
2020
2021 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2022 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2023 return false;
2024 }
2025
2026 return true;
2027 }
2028
2029 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2030 {
2031 struct nlattr **attrs = info->attrs;
2032 struct net_device *dev;
2033 struct macsec_secy *secy;
2034 struct macsec_tx_sc *tx_sc;
2035 struct macsec_tx_sa *tx_sa;
2036 u8 assoc_num;
2037 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2038
2039 if (!attrs[MACSEC_ATTR_IFINDEX])
2040 return -EINVAL;
2041
2042 if (parse_sa_config(attrs, tb_sa))
2043 return -EINVAL;
2044
2045 if (!validate_upd_sa(tb_sa))
2046 return -EINVAL;
2047
2048 rtnl_lock();
2049 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2050 &dev, &secy, &tx_sc, &assoc_num);
2051 if (IS_ERR(tx_sa)) {
2052 rtnl_unlock();
2053 return PTR_ERR(tx_sa);
2054 }
2055
2056 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2057 spin_lock_bh(&tx_sa->lock);
2058 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2059 spin_unlock_bh(&tx_sa->lock);
2060 }
2061
2062 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2063 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2064
2065 if (assoc_num == tx_sc->encoding_sa)
2066 secy->operational = tx_sa->active;
2067
2068 rtnl_unlock();
2069
2070 return 0;
2071 }
2072
2073 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2074 {
2075 struct nlattr **attrs = info->attrs;
2076 struct net_device *dev;
2077 struct macsec_secy *secy;
2078 struct macsec_rx_sc *rx_sc;
2079 struct macsec_rx_sa *rx_sa;
2080 u8 assoc_num;
2081 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2082 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2083
2084 if (!attrs[MACSEC_ATTR_IFINDEX])
2085 return -EINVAL;
2086
2087 if (parse_rxsc_config(attrs, tb_rxsc))
2088 return -EINVAL;
2089
2090 if (parse_sa_config(attrs, tb_sa))
2091 return -EINVAL;
2092
2093 if (!validate_upd_sa(tb_sa))
2094 return -EINVAL;
2095
2096 rtnl_lock();
2097 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2098 &dev, &secy, &rx_sc, &assoc_num);
2099 if (IS_ERR(rx_sa)) {
2100 rtnl_unlock();
2101 return PTR_ERR(rx_sa);
2102 }
2103
2104 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2105 spin_lock_bh(&rx_sa->lock);
2106 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2107 spin_unlock_bh(&rx_sa->lock);
2108 }
2109
2110 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2111 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2112
2113 rtnl_unlock();
2114 return 0;
2115 }
2116
2117 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2118 {
2119 struct nlattr **attrs = info->attrs;
2120 struct net_device *dev;
2121 struct macsec_secy *secy;
2122 struct macsec_rx_sc *rx_sc;
2123 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2124
2125 if (!attrs[MACSEC_ATTR_IFINDEX])
2126 return -EINVAL;
2127
2128 if (parse_rxsc_config(attrs, tb_rxsc))
2129 return -EINVAL;
2130
2131 if (!validate_add_rxsc(tb_rxsc))
2132 return -EINVAL;
2133
2134 rtnl_lock();
2135 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2136 if (IS_ERR(rx_sc)) {
2137 rtnl_unlock();
2138 return PTR_ERR(rx_sc);
2139 }
2140
2141 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2142 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2143
2144 if (rx_sc->active != new)
2145 secy->n_rx_sc += new ? 1 : -1;
2146
2147 rx_sc->active = new;
2148 }
2149
2150 rtnl_unlock();
2151
2152 return 0;
2153 }
2154
2155 static int copy_tx_sa_stats(struct sk_buff *skb,
2156 struct macsec_tx_sa_stats __percpu *pstats)
2157 {
2158 struct macsec_tx_sa_stats sum = {0, };
2159 int cpu;
2160
2161 for_each_possible_cpu(cpu) {
2162 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2163
2164 sum.OutPktsProtected += stats->OutPktsProtected;
2165 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2166 }
2167
2168 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2169 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2170 return -EMSGSIZE;
2171
2172 return 0;
2173 }
2174
2175 static int copy_rx_sa_stats(struct sk_buff *skb,
2176 struct macsec_rx_sa_stats __percpu *pstats)
2177 {
2178 struct macsec_rx_sa_stats sum = {0, };
2179 int cpu;
2180
2181 for_each_possible_cpu(cpu) {
2182 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2183
2184 sum.InPktsOK += stats->InPktsOK;
2185 sum.InPktsInvalid += stats->InPktsInvalid;
2186 sum.InPktsNotValid += stats->InPktsNotValid;
2187 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2188 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2189 }
2190
2191 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2192 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2193 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2194 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2195 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2196 return -EMSGSIZE;
2197
2198 return 0;
2199 }
2200
2201 static int copy_rx_sc_stats(struct sk_buff *skb,
2202 struct pcpu_rx_sc_stats __percpu *pstats)
2203 {
2204 struct macsec_rx_sc_stats sum = {0, };
2205 int cpu;
2206
2207 for_each_possible_cpu(cpu) {
2208 const struct pcpu_rx_sc_stats *stats;
2209 struct macsec_rx_sc_stats tmp;
2210 unsigned int start;
2211
2212 stats = per_cpu_ptr(pstats, cpu);
2213 do {
2214 start = u64_stats_fetch_begin_irq(&stats->syncp);
2215 memcpy(&tmp, &stats->stats, sizeof(tmp));
2216 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2217
2218 sum.InOctetsValidated += tmp.InOctetsValidated;
2219 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2220 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2221 sum.InPktsDelayed += tmp.InPktsDelayed;
2222 sum.InPktsOK += tmp.InPktsOK;
2223 sum.InPktsInvalid += tmp.InPktsInvalid;
2224 sum.InPktsLate += tmp.InPktsLate;
2225 sum.InPktsNotValid += tmp.InPktsNotValid;
2226 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2227 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2228 }
2229
2230 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2231 sum.InOctetsValidated,
2232 MACSEC_RXSC_STATS_ATTR_PAD) ||
2233 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2234 sum.InOctetsDecrypted,
2235 MACSEC_RXSC_STATS_ATTR_PAD) ||
2236 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2237 sum.InPktsUnchecked,
2238 MACSEC_RXSC_STATS_ATTR_PAD) ||
2239 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2240 sum.InPktsDelayed,
2241 MACSEC_RXSC_STATS_ATTR_PAD) ||
2242 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2243 sum.InPktsOK,
2244 MACSEC_RXSC_STATS_ATTR_PAD) ||
2245 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2246 sum.InPktsInvalid,
2247 MACSEC_RXSC_STATS_ATTR_PAD) ||
2248 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2249 sum.InPktsLate,
2250 MACSEC_RXSC_STATS_ATTR_PAD) ||
2251 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2252 sum.InPktsNotValid,
2253 MACSEC_RXSC_STATS_ATTR_PAD) ||
2254 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2255 sum.InPktsNotUsingSA,
2256 MACSEC_RXSC_STATS_ATTR_PAD) ||
2257 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2258 sum.InPktsUnusedSA,
2259 MACSEC_RXSC_STATS_ATTR_PAD))
2260 return -EMSGSIZE;
2261
2262 return 0;
2263 }
2264
2265 static int copy_tx_sc_stats(struct sk_buff *skb,
2266 struct pcpu_tx_sc_stats __percpu *pstats)
2267 {
2268 struct macsec_tx_sc_stats sum = {0, };
2269 int cpu;
2270
2271 for_each_possible_cpu(cpu) {
2272 const struct pcpu_tx_sc_stats *stats;
2273 struct macsec_tx_sc_stats tmp;
2274 unsigned int start;
2275
2276 stats = per_cpu_ptr(pstats, cpu);
2277 do {
2278 start = u64_stats_fetch_begin_irq(&stats->syncp);
2279 memcpy(&tmp, &stats->stats, sizeof(tmp));
2280 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2281
2282 sum.OutPktsProtected += tmp.OutPktsProtected;
2283 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2284 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2285 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2286 }
2287
2288 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2289 sum.OutPktsProtected,
2290 MACSEC_TXSC_STATS_ATTR_PAD) ||
2291 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2292 sum.OutPktsEncrypted,
2293 MACSEC_TXSC_STATS_ATTR_PAD) ||
2294 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2295 sum.OutOctetsProtected,
2296 MACSEC_TXSC_STATS_ATTR_PAD) ||
2297 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2298 sum.OutOctetsEncrypted,
2299 MACSEC_TXSC_STATS_ATTR_PAD))
2300 return -EMSGSIZE;
2301
2302 return 0;
2303 }
2304
2305 static int copy_secy_stats(struct sk_buff *skb,
2306 struct pcpu_secy_stats __percpu *pstats)
2307 {
2308 struct macsec_dev_stats sum = {0, };
2309 int cpu;
2310
2311 for_each_possible_cpu(cpu) {
2312 const struct pcpu_secy_stats *stats;
2313 struct macsec_dev_stats tmp;
2314 unsigned int start;
2315
2316 stats = per_cpu_ptr(pstats, cpu);
2317 do {
2318 start = u64_stats_fetch_begin_irq(&stats->syncp);
2319 memcpy(&tmp, &stats->stats, sizeof(tmp));
2320 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2321
2322 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2323 sum.InPktsUntagged += tmp.InPktsUntagged;
2324 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2325 sum.InPktsNoTag += tmp.InPktsNoTag;
2326 sum.InPktsBadTag += tmp.InPktsBadTag;
2327 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2328 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2329 sum.InPktsOverrun += tmp.InPktsOverrun;
2330 }
2331
2332 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2333 sum.OutPktsUntagged,
2334 MACSEC_SECY_STATS_ATTR_PAD) ||
2335 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2336 sum.InPktsUntagged,
2337 MACSEC_SECY_STATS_ATTR_PAD) ||
2338 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2339 sum.OutPktsTooLong,
2340 MACSEC_SECY_STATS_ATTR_PAD) ||
2341 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2342 sum.InPktsNoTag,
2343 MACSEC_SECY_STATS_ATTR_PAD) ||
2344 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2345 sum.InPktsBadTag,
2346 MACSEC_SECY_STATS_ATTR_PAD) ||
2347 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2348 sum.InPktsUnknownSCI,
2349 MACSEC_SECY_STATS_ATTR_PAD) ||
2350 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2351 sum.InPktsNoSCI,
2352 MACSEC_SECY_STATS_ATTR_PAD) ||
2353 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2354 sum.InPktsOverrun,
2355 MACSEC_SECY_STATS_ATTR_PAD))
2356 return -EMSGSIZE;
2357
2358 return 0;
2359 }
2360
2361 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2362 {
2363 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2364 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2365
2366 if (!secy_nest)
2367 return 1;
2368
2369 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2370 MACSEC_SECY_ATTR_PAD) ||
2371 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2372 MACSEC_DEFAULT_CIPHER_ID,
2373 MACSEC_SECY_ATTR_PAD) ||
2374 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2375 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2376 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2377 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2378 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2379 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2380 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2381 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2382 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2383 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2384 goto cancel;
2385
2386 if (secy->replay_protect) {
2387 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2388 goto cancel;
2389 }
2390
2391 nla_nest_end(skb, secy_nest);
2392 return 0;
2393
2394 cancel:
2395 nla_nest_cancel(skb, secy_nest);
2396 return 1;
2397 }
2398
2399 static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2400 struct sk_buff *skb, struct netlink_callback *cb)
2401 {
2402 struct macsec_rx_sc *rx_sc;
2403 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2404 struct nlattr *txsa_list, *rxsc_list;
2405 int i, j;
2406 void *hdr;
2407 struct nlattr *attr;
2408
2409 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2410 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2411 if (!hdr)
2412 return -EMSGSIZE;
2413
2414 genl_dump_check_consistent(cb, hdr);
2415
2416 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2417 goto nla_put_failure;
2418
2419 if (nla_put_secy(secy, skb))
2420 goto nla_put_failure;
2421
2422 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2423 if (!attr)
2424 goto nla_put_failure;
2425 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2426 nla_nest_cancel(skb, attr);
2427 goto nla_put_failure;
2428 }
2429 nla_nest_end(skb, attr);
2430
2431 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2432 if (!attr)
2433 goto nla_put_failure;
2434 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2435 nla_nest_cancel(skb, attr);
2436 goto nla_put_failure;
2437 }
2438 nla_nest_end(skb, attr);
2439
2440 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2441 if (!txsa_list)
2442 goto nla_put_failure;
2443 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2444 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2445 struct nlattr *txsa_nest;
2446
2447 if (!tx_sa)
2448 continue;
2449
2450 txsa_nest = nla_nest_start(skb, j++);
2451 if (!txsa_nest) {
2452 nla_nest_cancel(skb, txsa_list);
2453 goto nla_put_failure;
2454 }
2455
2456 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2457 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2458 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2459 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2460 nla_nest_cancel(skb, txsa_nest);
2461 nla_nest_cancel(skb, txsa_list);
2462 goto nla_put_failure;
2463 }
2464
2465 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2466 if (!attr) {
2467 nla_nest_cancel(skb, txsa_nest);
2468 nla_nest_cancel(skb, txsa_list);
2469 goto nla_put_failure;
2470 }
2471 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2472 nla_nest_cancel(skb, attr);
2473 nla_nest_cancel(skb, txsa_nest);
2474 nla_nest_cancel(skb, txsa_list);
2475 goto nla_put_failure;
2476 }
2477 nla_nest_end(skb, attr);
2478
2479 nla_nest_end(skb, txsa_nest);
2480 }
2481 nla_nest_end(skb, txsa_list);
2482
2483 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2484 if (!rxsc_list)
2485 goto nla_put_failure;
2486
2487 j = 1;
2488 for_each_rxsc_rtnl(secy, rx_sc) {
2489 int k;
2490 struct nlattr *rxsa_list;
2491 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2492
2493 if (!rxsc_nest) {
2494 nla_nest_cancel(skb, rxsc_list);
2495 goto nla_put_failure;
2496 }
2497
2498 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2499 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
2500 MACSEC_RXSC_ATTR_PAD)) {
2501 nla_nest_cancel(skb, rxsc_nest);
2502 nla_nest_cancel(skb, rxsc_list);
2503 goto nla_put_failure;
2504 }
2505
2506 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2507 if (!attr) {
2508 nla_nest_cancel(skb, rxsc_nest);
2509 nla_nest_cancel(skb, rxsc_list);
2510 goto nla_put_failure;
2511 }
2512 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2513 nla_nest_cancel(skb, attr);
2514 nla_nest_cancel(skb, rxsc_nest);
2515 nla_nest_cancel(skb, rxsc_list);
2516 goto nla_put_failure;
2517 }
2518 nla_nest_end(skb, attr);
2519
2520 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2521 if (!rxsa_list) {
2522 nla_nest_cancel(skb, rxsc_nest);
2523 nla_nest_cancel(skb, rxsc_list);
2524 goto nla_put_failure;
2525 }
2526
2527 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2528 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2529 struct nlattr *rxsa_nest;
2530
2531 if (!rx_sa)
2532 continue;
2533
2534 rxsa_nest = nla_nest_start(skb, k++);
2535 if (!rxsa_nest) {
2536 nla_nest_cancel(skb, rxsa_list);
2537 nla_nest_cancel(skb, rxsc_nest);
2538 nla_nest_cancel(skb, rxsc_list);
2539 goto nla_put_failure;
2540 }
2541
2542 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2543 if (!attr) {
2544 nla_nest_cancel(skb, rxsa_list);
2545 nla_nest_cancel(skb, rxsc_nest);
2546 nla_nest_cancel(skb, rxsc_list);
2547 goto nla_put_failure;
2548 }
2549 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2550 nla_nest_cancel(skb, attr);
2551 nla_nest_cancel(skb, rxsa_list);
2552 nla_nest_cancel(skb, rxsc_nest);
2553 nla_nest_cancel(skb, rxsc_list);
2554 goto nla_put_failure;
2555 }
2556 nla_nest_end(skb, attr);
2557
2558 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2559 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2560 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2561 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2562 nla_nest_cancel(skb, rxsa_nest);
2563 nla_nest_cancel(skb, rxsc_nest);
2564 nla_nest_cancel(skb, rxsc_list);
2565 goto nla_put_failure;
2566 }
2567 nla_nest_end(skb, rxsa_nest);
2568 }
2569
2570 nla_nest_end(skb, rxsa_list);
2571 nla_nest_end(skb, rxsc_nest);
2572 }
2573
2574 nla_nest_end(skb, rxsc_list);
2575
2576 genlmsg_end(skb, hdr);
2577
2578 return 0;
2579
2580 nla_put_failure:
2581 genlmsg_cancel(skb, hdr);
2582 return -EMSGSIZE;
2583 }
2584
2585 static int macsec_generation = 1; /* protected by RTNL */
2586
2587 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2588 {
2589 struct net *net = sock_net(skb->sk);
2590 struct net_device *dev;
2591 int dev_idx, d;
2592
2593 dev_idx = cb->args[0];
2594
2595 d = 0;
2596 rtnl_lock();
2597
2598 cb->seq = macsec_generation;
2599
2600 for_each_netdev(net, dev) {
2601 struct macsec_secy *secy;
2602
2603 if (d < dev_idx)
2604 goto next;
2605
2606 if (!netif_is_macsec(dev))
2607 goto next;
2608
2609 secy = &macsec_priv(dev)->secy;
2610 if (dump_secy(secy, dev, skb, cb) < 0)
2611 goto done;
2612 next:
2613 d++;
2614 }
2615
2616 done:
2617 rtnl_unlock();
2618 cb->args[0] = d;
2619 return skb->len;
2620 }
2621
2622 static const struct genl_ops macsec_genl_ops[] = {
2623 {
2624 .cmd = MACSEC_CMD_GET_TXSC,
2625 .dumpit = macsec_dump_txsc,
2626 .policy = macsec_genl_policy,
2627 },
2628 {
2629 .cmd = MACSEC_CMD_ADD_RXSC,
2630 .doit = macsec_add_rxsc,
2631 .policy = macsec_genl_policy,
2632 .flags = GENL_ADMIN_PERM,
2633 },
2634 {
2635 .cmd = MACSEC_CMD_DEL_RXSC,
2636 .doit = macsec_del_rxsc,
2637 .policy = macsec_genl_policy,
2638 .flags = GENL_ADMIN_PERM,
2639 },
2640 {
2641 .cmd = MACSEC_CMD_UPD_RXSC,
2642 .doit = macsec_upd_rxsc,
2643 .policy = macsec_genl_policy,
2644 .flags = GENL_ADMIN_PERM,
2645 },
2646 {
2647 .cmd = MACSEC_CMD_ADD_TXSA,
2648 .doit = macsec_add_txsa,
2649 .policy = macsec_genl_policy,
2650 .flags = GENL_ADMIN_PERM,
2651 },
2652 {
2653 .cmd = MACSEC_CMD_DEL_TXSA,
2654 .doit = macsec_del_txsa,
2655 .policy = macsec_genl_policy,
2656 .flags = GENL_ADMIN_PERM,
2657 },
2658 {
2659 .cmd = MACSEC_CMD_UPD_TXSA,
2660 .doit = macsec_upd_txsa,
2661 .policy = macsec_genl_policy,
2662 .flags = GENL_ADMIN_PERM,
2663 },
2664 {
2665 .cmd = MACSEC_CMD_ADD_RXSA,
2666 .doit = macsec_add_rxsa,
2667 .policy = macsec_genl_policy,
2668 .flags = GENL_ADMIN_PERM,
2669 },
2670 {
2671 .cmd = MACSEC_CMD_DEL_RXSA,
2672 .doit = macsec_del_rxsa,
2673 .policy = macsec_genl_policy,
2674 .flags = GENL_ADMIN_PERM,
2675 },
2676 {
2677 .cmd = MACSEC_CMD_UPD_RXSA,
2678 .doit = macsec_upd_rxsa,
2679 .policy = macsec_genl_policy,
2680 .flags = GENL_ADMIN_PERM,
2681 },
2682 };
2683
2684 static struct genl_family macsec_fam __ro_after_init = {
2685 .name = MACSEC_GENL_NAME,
2686 .hdrsize = 0,
2687 .version = MACSEC_GENL_VERSION,
2688 .maxattr = MACSEC_ATTR_MAX,
2689 .netnsok = true,
2690 .module = THIS_MODULE,
2691 .ops = macsec_genl_ops,
2692 .n_ops = ARRAY_SIZE(macsec_genl_ops),
2693 };
2694
2695 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2696 struct net_device *dev)
2697 {
2698 struct macsec_dev *macsec = netdev_priv(dev);
2699 struct macsec_secy *secy = &macsec->secy;
2700 struct pcpu_secy_stats *secy_stats;
2701 int ret, len;
2702
2703 /* 10.5 */
2704 if (!secy->protect_frames) {
2705 secy_stats = this_cpu_ptr(macsec->stats);
2706 u64_stats_update_begin(&secy_stats->syncp);
2707 secy_stats->stats.OutPktsUntagged++;
2708 u64_stats_update_end(&secy_stats->syncp);
2709 skb->dev = macsec->real_dev;
2710 len = skb->len;
2711 ret = dev_queue_xmit(skb);
2712 count_tx(dev, ret, len);
2713 return ret;
2714 }
2715
2716 if (!secy->operational) {
2717 kfree_skb(skb);
2718 dev->stats.tx_dropped++;
2719 return NETDEV_TX_OK;
2720 }
2721
2722 skb = macsec_encrypt(skb, dev);
2723 if (IS_ERR(skb)) {
2724 if (PTR_ERR(skb) != -EINPROGRESS)
2725 dev->stats.tx_dropped++;
2726 return NETDEV_TX_OK;
2727 }
2728
2729 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2730
2731 macsec_encrypt_finish(skb, dev);
2732 len = skb->len;
2733 ret = dev_queue_xmit(skb);
2734 count_tx(dev, ret, len);
2735 return ret;
2736 }
2737
2738 #define MACSEC_FEATURES \
2739 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2740 static struct lock_class_key macsec_netdev_addr_lock_key;
2741
2742 static int macsec_dev_init(struct net_device *dev)
2743 {
2744 struct macsec_dev *macsec = macsec_priv(dev);
2745 struct net_device *real_dev = macsec->real_dev;
2746 int err;
2747
2748 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2749 if (!dev->tstats)
2750 return -ENOMEM;
2751
2752 err = gro_cells_init(&macsec->gro_cells, dev);
2753 if (err) {
2754 free_percpu(dev->tstats);
2755 return err;
2756 }
2757
2758 dev->features = real_dev->features & MACSEC_FEATURES;
2759 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2760
2761 dev->needed_headroom = real_dev->needed_headroom +
2762 MACSEC_NEEDED_HEADROOM;
2763 dev->needed_tailroom = real_dev->needed_tailroom +
2764 MACSEC_NEEDED_TAILROOM;
2765
2766 if (is_zero_ether_addr(dev->dev_addr))
2767 eth_hw_addr_inherit(dev, real_dev);
2768 if (is_zero_ether_addr(dev->broadcast))
2769 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2770
2771 return 0;
2772 }
2773
2774 static void macsec_dev_uninit(struct net_device *dev)
2775 {
2776 struct macsec_dev *macsec = macsec_priv(dev);
2777
2778 gro_cells_destroy(&macsec->gro_cells);
2779 free_percpu(dev->tstats);
2780 }
2781
2782 static netdev_features_t macsec_fix_features(struct net_device *dev,
2783 netdev_features_t features)
2784 {
2785 struct macsec_dev *macsec = macsec_priv(dev);
2786 struct net_device *real_dev = macsec->real_dev;
2787
2788 features &= (real_dev->features & MACSEC_FEATURES) |
2789 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
2790 features |= NETIF_F_LLTX;
2791
2792 return features;
2793 }
2794
2795 static int macsec_dev_open(struct net_device *dev)
2796 {
2797 struct macsec_dev *macsec = macsec_priv(dev);
2798 struct net_device *real_dev = macsec->real_dev;
2799 int err;
2800
2801 if (!(real_dev->flags & IFF_UP))
2802 return -ENETDOWN;
2803
2804 err = dev_uc_add(real_dev, dev->dev_addr);
2805 if (err < 0)
2806 return err;
2807
2808 if (dev->flags & IFF_ALLMULTI) {
2809 err = dev_set_allmulti(real_dev, 1);
2810 if (err < 0)
2811 goto del_unicast;
2812 }
2813
2814 if (dev->flags & IFF_PROMISC) {
2815 err = dev_set_promiscuity(real_dev, 1);
2816 if (err < 0)
2817 goto clear_allmulti;
2818 }
2819
2820 if (netif_carrier_ok(real_dev))
2821 netif_carrier_on(dev);
2822
2823 return 0;
2824 clear_allmulti:
2825 if (dev->flags & IFF_ALLMULTI)
2826 dev_set_allmulti(real_dev, -1);
2827 del_unicast:
2828 dev_uc_del(real_dev, dev->dev_addr);
2829 netif_carrier_off(dev);
2830 return err;
2831 }
2832
2833 static int macsec_dev_stop(struct net_device *dev)
2834 {
2835 struct macsec_dev *macsec = macsec_priv(dev);
2836 struct net_device *real_dev = macsec->real_dev;
2837
2838 netif_carrier_off(dev);
2839
2840 dev_mc_unsync(real_dev, dev);
2841 dev_uc_unsync(real_dev, dev);
2842
2843 if (dev->flags & IFF_ALLMULTI)
2844 dev_set_allmulti(real_dev, -1);
2845
2846 if (dev->flags & IFF_PROMISC)
2847 dev_set_promiscuity(real_dev, -1);
2848
2849 dev_uc_del(real_dev, dev->dev_addr);
2850
2851 return 0;
2852 }
2853
2854 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2855 {
2856 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2857
2858 if (!(dev->flags & IFF_UP))
2859 return;
2860
2861 if (change & IFF_ALLMULTI)
2862 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2863
2864 if (change & IFF_PROMISC)
2865 dev_set_promiscuity(real_dev,
2866 dev->flags & IFF_PROMISC ? 1 : -1);
2867 }
2868
2869 static void macsec_dev_set_rx_mode(struct net_device *dev)
2870 {
2871 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2872
2873 dev_mc_sync(real_dev, dev);
2874 dev_uc_sync(real_dev, dev);
2875 }
2876
2877 static int macsec_set_mac_address(struct net_device *dev, void *p)
2878 {
2879 struct macsec_dev *macsec = macsec_priv(dev);
2880 struct net_device *real_dev = macsec->real_dev;
2881 struct sockaddr *addr = p;
2882 int err;
2883
2884 if (!is_valid_ether_addr(addr->sa_data))
2885 return -EADDRNOTAVAIL;
2886
2887 if (!(dev->flags & IFF_UP))
2888 goto out;
2889
2890 err = dev_uc_add(real_dev, addr->sa_data);
2891 if (err < 0)
2892 return err;
2893
2894 dev_uc_del(real_dev, dev->dev_addr);
2895
2896 out:
2897 ether_addr_copy(dev->dev_addr, addr->sa_data);
2898 return 0;
2899 }
2900
2901 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2902 {
2903 struct macsec_dev *macsec = macsec_priv(dev);
2904 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2905
2906 if (macsec->real_dev->mtu - extra < new_mtu)
2907 return -ERANGE;
2908
2909 dev->mtu = new_mtu;
2910
2911 return 0;
2912 }
2913
2914 static void macsec_get_stats64(struct net_device *dev,
2915 struct rtnl_link_stats64 *s)
2916 {
2917 int cpu;
2918
2919 if (!dev->tstats)
2920 return;
2921
2922 for_each_possible_cpu(cpu) {
2923 struct pcpu_sw_netstats *stats;
2924 struct pcpu_sw_netstats tmp;
2925 int start;
2926
2927 stats = per_cpu_ptr(dev->tstats, cpu);
2928 do {
2929 start = u64_stats_fetch_begin_irq(&stats->syncp);
2930 tmp.rx_packets = stats->rx_packets;
2931 tmp.rx_bytes = stats->rx_bytes;
2932 tmp.tx_packets = stats->tx_packets;
2933 tmp.tx_bytes = stats->tx_bytes;
2934 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2935
2936 s->rx_packets += tmp.rx_packets;
2937 s->rx_bytes += tmp.rx_bytes;
2938 s->tx_packets += tmp.tx_packets;
2939 s->tx_bytes += tmp.tx_bytes;
2940 }
2941
2942 s->rx_dropped = dev->stats.rx_dropped;
2943 s->tx_dropped = dev->stats.tx_dropped;
2944 }
2945
2946 static int macsec_get_iflink(const struct net_device *dev)
2947 {
2948 return macsec_priv(dev)->real_dev->ifindex;
2949 }
2950
2951
2952 static int macsec_get_nest_level(struct net_device *dev)
2953 {
2954 return macsec_priv(dev)->nest_level;
2955 }
2956
2957
2958 static const struct net_device_ops macsec_netdev_ops = {
2959 .ndo_init = macsec_dev_init,
2960 .ndo_uninit = macsec_dev_uninit,
2961 .ndo_open = macsec_dev_open,
2962 .ndo_stop = macsec_dev_stop,
2963 .ndo_fix_features = macsec_fix_features,
2964 .ndo_change_mtu = macsec_change_mtu,
2965 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2966 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2967 .ndo_set_mac_address = macsec_set_mac_address,
2968 .ndo_start_xmit = macsec_start_xmit,
2969 .ndo_get_stats64 = macsec_get_stats64,
2970 .ndo_get_iflink = macsec_get_iflink,
2971 .ndo_get_lock_subclass = macsec_get_nest_level,
2972 };
2973
2974 static const struct device_type macsec_type = {
2975 .name = "macsec",
2976 };
2977
2978 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2979 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2980 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2981 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2982 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2983 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2984 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2985 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
2986 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
2987 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
2988 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
2989 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
2990 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
2991 };
2992
2993 static void macsec_free_netdev(struct net_device *dev)
2994 {
2995 struct macsec_dev *macsec = macsec_priv(dev);
2996 struct net_device *real_dev = macsec->real_dev;
2997
2998 free_percpu(macsec->stats);
2999 free_percpu(macsec->secy.tx_sc.stats);
3000
3001 dev_put(real_dev);
3002 }
3003
3004 static void macsec_setup(struct net_device *dev)
3005 {
3006 ether_setup(dev);
3007 dev->min_mtu = 0;
3008 dev->max_mtu = ETH_MAX_MTU;
3009 dev->priv_flags |= IFF_NO_QUEUE;
3010 dev->netdev_ops = &macsec_netdev_ops;
3011 dev->needs_free_netdev = true;
3012 dev->priv_destructor = macsec_free_netdev;
3013 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3014
3015 eth_zero_addr(dev->broadcast);
3016 }
3017
3018 static void macsec_changelink_common(struct net_device *dev,
3019 struct nlattr *data[])
3020 {
3021 struct macsec_secy *secy;
3022 struct macsec_tx_sc *tx_sc;
3023
3024 secy = &macsec_priv(dev)->secy;
3025 tx_sc = &secy->tx_sc;
3026
3027 if (data[IFLA_MACSEC_ENCODING_SA]) {
3028 struct macsec_tx_sa *tx_sa;
3029
3030 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3031 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3032
3033 secy->operational = tx_sa && tx_sa->active;
3034 }
3035
3036 if (data[IFLA_MACSEC_WINDOW])
3037 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3038
3039 if (data[IFLA_MACSEC_ENCRYPT])
3040 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3041
3042 if (data[IFLA_MACSEC_PROTECT])
3043 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3044
3045 if (data[IFLA_MACSEC_INC_SCI])
3046 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3047
3048 if (data[IFLA_MACSEC_ES])
3049 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3050
3051 if (data[IFLA_MACSEC_SCB])
3052 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3053
3054 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3055 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3056
3057 if (data[IFLA_MACSEC_VALIDATION])
3058 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3059 }
3060
3061 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3062 struct nlattr *data[],
3063 struct netlink_ext_ack *extack)
3064 {
3065 if (!data)
3066 return 0;
3067
3068 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3069 data[IFLA_MACSEC_ICV_LEN] ||
3070 data[IFLA_MACSEC_SCI] ||
3071 data[IFLA_MACSEC_PORT])
3072 return -EINVAL;
3073
3074 macsec_changelink_common(dev, data);
3075
3076 return 0;
3077 }
3078
3079 static void macsec_del_dev(struct macsec_dev *macsec)
3080 {
3081 int i;
3082
3083 while (macsec->secy.rx_sc) {
3084 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3085
3086 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3087 free_rx_sc(rx_sc);
3088 }
3089
3090 for (i = 0; i < MACSEC_NUM_AN; i++) {
3091 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3092
3093 if (sa) {
3094 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3095 clear_tx_sa(sa);
3096 }
3097 }
3098 }
3099
3100 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3101 {
3102 struct macsec_dev *macsec = macsec_priv(dev);
3103 struct net_device *real_dev = macsec->real_dev;
3104
3105 unregister_netdevice_queue(dev, head);
3106 list_del_rcu(&macsec->secys);
3107 macsec_del_dev(macsec);
3108 netdev_upper_dev_unlink(real_dev, dev);
3109
3110 macsec_generation++;
3111 }
3112
3113 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3114 {
3115 struct macsec_dev *macsec = macsec_priv(dev);
3116 struct net_device *real_dev = macsec->real_dev;
3117 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3118
3119 macsec_common_dellink(dev, head);
3120
3121 if (list_empty(&rxd->secys)) {
3122 netdev_rx_handler_unregister(real_dev);
3123 kfree(rxd);
3124 }
3125 }
3126
3127 static int register_macsec_dev(struct net_device *real_dev,
3128 struct net_device *dev)
3129 {
3130 struct macsec_dev *macsec = macsec_priv(dev);
3131 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3132
3133 if (!rxd) {
3134 int err;
3135
3136 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3137 if (!rxd)
3138 return -ENOMEM;
3139
3140 INIT_LIST_HEAD(&rxd->secys);
3141
3142 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3143 rxd);
3144 if (err < 0) {
3145 kfree(rxd);
3146 return err;
3147 }
3148 }
3149
3150 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3151 return 0;
3152 }
3153
3154 static bool sci_exists(struct net_device *dev, sci_t sci)
3155 {
3156 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3157 struct macsec_dev *macsec;
3158
3159 list_for_each_entry(macsec, &rxd->secys, secys) {
3160 if (macsec->secy.sci == sci)
3161 return true;
3162 }
3163
3164 return false;
3165 }
3166
3167 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3168 {
3169 return make_sci(dev->dev_addr, port);
3170 }
3171
3172 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3173 {
3174 struct macsec_dev *macsec = macsec_priv(dev);
3175 struct macsec_secy *secy = &macsec->secy;
3176
3177 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3178 if (!macsec->stats)
3179 return -ENOMEM;
3180
3181 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3182 if (!secy->tx_sc.stats) {
3183 free_percpu(macsec->stats);
3184 return -ENOMEM;
3185 }
3186
3187 if (sci == MACSEC_UNDEF_SCI)
3188 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3189
3190 secy->netdev = dev;
3191 secy->operational = true;
3192 secy->key_len = DEFAULT_SAK_LEN;
3193 secy->icv_len = icv_len;
3194 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3195 secy->protect_frames = true;
3196 secy->replay_protect = false;
3197
3198 secy->sci = sci;
3199 secy->tx_sc.active = true;
3200 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3201 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3202 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3203 secy->tx_sc.end_station = false;
3204 secy->tx_sc.scb = false;
3205
3206 return 0;
3207 }
3208
3209 static int macsec_newlink(struct net *net, struct net_device *dev,
3210 struct nlattr *tb[], struct nlattr *data[],
3211 struct netlink_ext_ack *extack)
3212 {
3213 struct macsec_dev *macsec = macsec_priv(dev);
3214 struct net_device *real_dev;
3215 int err;
3216 sci_t sci;
3217 u8 icv_len = DEFAULT_ICV_LEN;
3218 rx_handler_func_t *rx_handler;
3219
3220 if (!tb[IFLA_LINK])
3221 return -EINVAL;
3222 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3223 if (!real_dev)
3224 return -ENODEV;
3225
3226 dev->priv_flags |= IFF_MACSEC;
3227
3228 macsec->real_dev = real_dev;
3229
3230 if (data && data[IFLA_MACSEC_ICV_LEN])
3231 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3232 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3233
3234 rx_handler = rtnl_dereference(real_dev->rx_handler);
3235 if (rx_handler && rx_handler != macsec_handle_frame)
3236 return -EBUSY;
3237
3238 err = register_netdevice(dev);
3239 if (err < 0)
3240 return err;
3241
3242 dev_hold(real_dev);
3243
3244 macsec->nest_level = dev_get_nest_level(real_dev) + 1;
3245 netdev_lockdep_set_classes(dev);
3246 lockdep_set_class_and_subclass(&dev->addr_list_lock,
3247 &macsec_netdev_addr_lock_key,
3248 macsec_get_nest_level(dev));
3249
3250 err = netdev_upper_dev_link(real_dev, dev, extack);
3251 if (err < 0)
3252 goto unregister;
3253
3254 /* need to be already registered so that ->init has run and
3255 * the MAC addr is set
3256 */
3257 if (data && data[IFLA_MACSEC_SCI])
3258 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3259 else if (data && data[IFLA_MACSEC_PORT])
3260 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3261 else
3262 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3263
3264 if (rx_handler && sci_exists(real_dev, sci)) {
3265 err = -EBUSY;
3266 goto unlink;
3267 }
3268
3269 err = macsec_add_dev(dev, sci, icv_len);
3270 if (err)
3271 goto unlink;
3272
3273 if (data)
3274 macsec_changelink_common(dev, data);
3275
3276 err = register_macsec_dev(real_dev, dev);
3277 if (err < 0)
3278 goto del_dev;
3279
3280 macsec_generation++;
3281
3282 return 0;
3283
3284 del_dev:
3285 macsec_del_dev(macsec);
3286 unlink:
3287 netdev_upper_dev_unlink(real_dev, dev);
3288 unregister:
3289 unregister_netdevice(dev);
3290 return err;
3291 }
3292
3293 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
3294 struct netlink_ext_ack *extack)
3295 {
3296 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3297 u8 icv_len = DEFAULT_ICV_LEN;
3298 int flag;
3299 bool es, scb, sci;
3300
3301 if (!data)
3302 return 0;
3303
3304 if (data[IFLA_MACSEC_CIPHER_SUITE])
3305 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3306
3307 if (data[IFLA_MACSEC_ICV_LEN]) {
3308 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3309 if (icv_len != DEFAULT_ICV_LEN) {
3310 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
3311 struct crypto_aead *dummy_tfm;
3312
3313 dummy_tfm = macsec_alloc_tfm(dummy_key,
3314 DEFAULT_SAK_LEN,
3315 icv_len);
3316 if (IS_ERR(dummy_tfm))
3317 return PTR_ERR(dummy_tfm);
3318 crypto_free_aead(dummy_tfm);
3319 }
3320 }
3321
3322 switch (csid) {
3323 case MACSEC_DEFAULT_CIPHER_ID:
3324 case MACSEC_DEFAULT_CIPHER_ALT:
3325 if (icv_len < MACSEC_MIN_ICV_LEN ||
3326 icv_len > MACSEC_STD_ICV_LEN)
3327 return -EINVAL;
3328 break;
3329 default:
3330 return -EINVAL;
3331 }
3332
3333 if (data[IFLA_MACSEC_ENCODING_SA]) {
3334 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3335 return -EINVAL;
3336 }
3337
3338 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3339 flag < IFLA_MACSEC_VALIDATION;
3340 flag++) {
3341 if (data[flag]) {
3342 if (nla_get_u8(data[flag]) > 1)
3343 return -EINVAL;
3344 }
3345 }
3346
3347 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3348 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3349 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3350
3351 if ((sci && (scb || es)) || (scb && es))
3352 return -EINVAL;
3353
3354 if (data[IFLA_MACSEC_VALIDATION] &&
3355 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3356 return -EINVAL;
3357
3358 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3359 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3360 !data[IFLA_MACSEC_WINDOW])
3361 return -EINVAL;
3362
3363 return 0;
3364 }
3365
3366 static struct net *macsec_get_link_net(const struct net_device *dev)
3367 {
3368 return dev_net(macsec_priv(dev)->real_dev);
3369 }
3370
3371 static size_t macsec_get_size(const struct net_device *dev)
3372 {
3373 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
3374 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
3375 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
3376 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
3377 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
3378 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
3379 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
3380 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
3381 nla_total_size(1) + /* IFLA_MACSEC_ES */
3382 nla_total_size(1) + /* IFLA_MACSEC_SCB */
3383 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
3384 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
3385 0;
3386 }
3387
3388 static int macsec_fill_info(struct sk_buff *skb,
3389 const struct net_device *dev)
3390 {
3391 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3392 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3393
3394 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
3395 IFLA_MACSEC_PAD) ||
3396 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3397 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
3398 MACSEC_DEFAULT_CIPHER_ID, IFLA_MACSEC_PAD) ||
3399 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3400 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3401 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3402 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3403 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3404 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3405 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3406 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3407 0)
3408 goto nla_put_failure;
3409
3410 if (secy->replay_protect) {
3411 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3412 goto nla_put_failure;
3413 }
3414
3415 return 0;
3416
3417 nla_put_failure:
3418 return -EMSGSIZE;
3419 }
3420
3421 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3422 .kind = "macsec",
3423 .priv_size = sizeof(struct macsec_dev),
3424 .maxtype = IFLA_MACSEC_MAX,
3425 .policy = macsec_rtnl_policy,
3426 .setup = macsec_setup,
3427 .validate = macsec_validate_attr,
3428 .newlink = macsec_newlink,
3429 .changelink = macsec_changelink,
3430 .dellink = macsec_dellink,
3431 .get_size = macsec_get_size,
3432 .fill_info = macsec_fill_info,
3433 .get_link_net = macsec_get_link_net,
3434 };
3435
3436 static bool is_macsec_master(struct net_device *dev)
3437 {
3438 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3439 }
3440
3441 static int macsec_notify(struct notifier_block *this, unsigned long event,
3442 void *ptr)
3443 {
3444 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3445 LIST_HEAD(head);
3446
3447 if (!is_macsec_master(real_dev))
3448 return NOTIFY_DONE;
3449
3450 switch (event) {
3451 case NETDEV_UNREGISTER: {
3452 struct macsec_dev *m, *n;
3453 struct macsec_rxh_data *rxd;
3454
3455 rxd = macsec_data_rtnl(real_dev);
3456 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3457 macsec_common_dellink(m->secy.netdev, &head);
3458 }
3459
3460 netdev_rx_handler_unregister(real_dev);
3461 kfree(rxd);
3462
3463 unregister_netdevice_many(&head);
3464 break;
3465 }
3466 case NETDEV_CHANGEMTU: {
3467 struct macsec_dev *m;
3468 struct macsec_rxh_data *rxd;
3469
3470 rxd = macsec_data_rtnl(real_dev);
3471 list_for_each_entry(m, &rxd->secys, secys) {
3472 struct net_device *dev = m->secy.netdev;
3473 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3474 macsec_extra_len(true));
3475
3476 if (dev->mtu > mtu)
3477 dev_set_mtu(dev, mtu);
3478 }
3479 }
3480 }
3481
3482 return NOTIFY_OK;
3483 }
3484
3485 static struct notifier_block macsec_notifier = {
3486 .notifier_call = macsec_notify,
3487 };
3488
3489 static int __init macsec_init(void)
3490 {
3491 int err;
3492
3493 pr_info("MACsec IEEE 802.1AE\n");
3494 err = register_netdevice_notifier(&macsec_notifier);
3495 if (err)
3496 return err;
3497
3498 err = rtnl_link_register(&macsec_link_ops);
3499 if (err)
3500 goto notifier;
3501
3502 err = genl_register_family(&macsec_fam);
3503 if (err)
3504 goto rtnl;
3505
3506 return 0;
3507
3508 rtnl:
3509 rtnl_link_unregister(&macsec_link_ops);
3510 notifier:
3511 unregister_netdevice_notifier(&macsec_notifier);
3512 return err;
3513 }
3514
3515 static void __exit macsec_exit(void)
3516 {
3517 genl_unregister_family(&macsec_fam);
3518 rtnl_link_unregister(&macsec_link_ops);
3519 unregister_netdevice_notifier(&macsec_notifier);
3520 rcu_barrier();
3521 }
3522
3523 module_init(macsec_init);
3524 module_exit(macsec_exit);
3525
3526 MODULE_ALIAS_RTNL_LINK("macsec");
3527 MODULE_ALIAS_GENL_FAMILY("macsec");
3528
3529 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3530 MODULE_LICENSE("GPL v2");
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