1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * drivers/net/macsec.c - MACsec device
4 *
5 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
6 */
7
8 #include <linux/types.h>
9 #include <linux/skbuff.h>
10 #include <linux/socket.h>
11 #include <linux/module.h>
12 #include <crypto/aead.h>
13 #include <linux/etherdevice.h>
14 #include <linux/rtnetlink.h>
15 #include <linux/refcount.h>
16 #include <net/genetlink.h>
17 #include <net/sock.h>
18 #include <net/gro_cells.h>
19
20 #include <uapi/linux/if_macsec.h>
21
22 typedef u64 __bitwise sci_t;
23
24 #define MACSEC_SCI_LEN 8
25
26 /* SecTAG length = macsec_eth_header without the optional SCI */
27 #define MACSEC_TAG_LEN 6
28
29 struct macsec_eth_header {
30 struct ethhdr eth;
31 /* SecTAG */
32 u8 tci_an;
33 #if defined(__LITTLE_ENDIAN_BITFIELD)
34 u8 short_length:6,
35 unused:2;
36 #elif defined(__BIG_ENDIAN_BITFIELD)
37 u8 unused:2,
38 short_length:6;
39 #else
40 #error "Please fix <asm/byteorder.h>"
41 #endif
42 __be32 packet_number;
43 u8 secure_channel_id[8]; /* optional */
44 } __packed;
45
46 #define MACSEC_TCI_VERSION 0x80
47 #define MACSEC_TCI_ES 0x40 /* end station */
48 #define MACSEC_TCI_SC 0x20 /* SCI present */
49 #define MACSEC_TCI_SCB 0x10 /* epon */
50 #define MACSEC_TCI_E 0x08 /* encryption */
51 #define MACSEC_TCI_C 0x04 /* changed text */
52 #define MACSEC_AN_MASK 0x03 /* association number */
53 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
54
55 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
56 #define MIN_NON_SHORT_LEN 48
57
58 #define GCM_AES_IV_LEN 12
59 #define DEFAULT_ICV_LEN 16
60
61 #define MACSEC_NUM_AN 4 /* 2 bits for the association number */
62
63 #define for_each_rxsc(secy, sc) \
64 for (sc = rcu_dereference_bh(secy->rx_sc); \
65 sc; \
66 sc = rcu_dereference_bh(sc->next))
67 #define for_each_rxsc_rtnl(secy, sc) \
68 for (sc = rtnl_dereference(secy->rx_sc); \
69 sc; \
70 sc = rtnl_dereference(sc->next))
71
72 struct gcm_iv {
73 union {
74 u8 secure_channel_id[8];
75 sci_t sci;
76 };
77 __be32 pn;
78 };
79
80 /**
81 * struct macsec_key - SA key
82 * @id: user-provided key identifier
83 * @tfm: crypto struct, key storage
84 */
85 struct macsec_key {
86 u8 id[MACSEC_KEYID_LEN];
87 struct crypto_aead *tfm;
88 };
89
90 struct macsec_rx_sc_stats {
91 __u64 InOctetsValidated;
92 __u64 InOctetsDecrypted;
93 __u64 InPktsUnchecked;
94 __u64 InPktsDelayed;
95 __u64 InPktsOK;
96 __u64 InPktsInvalid;
97 __u64 InPktsLate;
98 __u64 InPktsNotValid;
99 __u64 InPktsNotUsingSA;
100 __u64 InPktsUnusedSA;
101 };
102
103 struct macsec_rx_sa_stats {
104 __u32 InPktsOK;
105 __u32 InPktsInvalid;
106 __u32 InPktsNotValid;
107 __u32 InPktsNotUsingSA;
108 __u32 InPktsUnusedSA;
109 };
110
111 struct macsec_tx_sa_stats {
112 __u32 OutPktsProtected;
113 __u32 OutPktsEncrypted;
114 };
115
116 struct macsec_tx_sc_stats {
117 __u64 OutPktsProtected;
118 __u64 OutPktsEncrypted;
119 __u64 OutOctetsProtected;
120 __u64 OutOctetsEncrypted;
121 };
122
123 struct macsec_dev_stats {
124 __u64 OutPktsUntagged;
125 __u64 InPktsUntagged;
126 __u64 OutPktsTooLong;
127 __u64 InPktsNoTag;
128 __u64 InPktsBadTag;
129 __u64 InPktsUnknownSCI;
130 __u64 InPktsNoSCI;
131 __u64 InPktsOverrun;
132 };
133
134 /**
135 * struct macsec_rx_sa - receive secure association
136 * @active:
137 * @next_pn: packet number expected for the next packet
138 * @lock: protects next_pn manipulations
139 * @key: key structure
140 * @stats: per-SA stats
141 */
142 struct macsec_rx_sa {
143 struct macsec_key key;
144 spinlock_t lock;
145 u32 next_pn;
146 refcount_t refcnt;
147 bool active;
148 struct macsec_rx_sa_stats __percpu *stats;
149 struct macsec_rx_sc *sc;
150 struct rcu_head rcu;
151 };
152
153 struct pcpu_rx_sc_stats {
154 struct macsec_rx_sc_stats stats;
155 struct u64_stats_sync syncp;
156 };
157
158 /**
159 * struct macsec_rx_sc - receive secure channel
160 * @sci: secure channel identifier for this SC
161 * @active: channel is active
162 * @sa: array of secure associations
163 * @stats: per-SC stats
164 */
165 struct macsec_rx_sc {
166 struct macsec_rx_sc __rcu *next;
167 sci_t sci;
168 bool active;
169 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN];
170 struct pcpu_rx_sc_stats __percpu *stats;
171 refcount_t refcnt;
172 struct rcu_head rcu_head;
173 };
174
175 /**
176 * struct macsec_tx_sa - transmit secure association
177 * @active:
178 * @next_pn: packet number to use for the next packet
179 * @lock: protects next_pn manipulations
180 * @key: key structure
181 * @stats: per-SA stats
182 */
183 struct macsec_tx_sa {
184 struct macsec_key key;
185 spinlock_t lock;
186 u32 next_pn;
187 refcount_t refcnt;
188 bool active;
189 struct macsec_tx_sa_stats __percpu *stats;
190 struct rcu_head rcu;
191 };
192
193 struct pcpu_tx_sc_stats {
194 struct macsec_tx_sc_stats stats;
195 struct u64_stats_sync syncp;
196 };
197
198 /**
199 * struct macsec_tx_sc - transmit secure channel
200 * @active:
201 * @encoding_sa: association number of the SA currently in use
202 * @encrypt: encrypt packets on transmit, or authenticate only
203 * @send_sci: always include the SCI in the SecTAG
204 * @end_station:
205 * @scb: single copy broadcast flag
206 * @sa: array of secure associations
207 * @stats: stats for this TXSC
208 */
209 struct macsec_tx_sc {
210 bool active;
211 u8 encoding_sa;
212 bool encrypt;
213 bool send_sci;
214 bool end_station;
215 bool scb;
216 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN];
217 struct pcpu_tx_sc_stats __percpu *stats;
218 };
219
220 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
221
222 /**
223 * struct macsec_secy - MACsec Security Entity
224 * @netdev: netdevice for this SecY
225 * @n_rx_sc: number of receive secure channels configured on this SecY
226 * @sci: secure channel identifier used for tx
227 * @key_len: length of keys used by the cipher suite
228 * @icv_len: length of ICV used by the cipher suite
229 * @validate_frames: validation mode
230 * @operational: MAC_Operational flag
231 * @protect_frames: enable protection for this SecY
232 * @replay_protect: enable packet number checks on receive
233 * @replay_window: size of the replay window
234 * @tx_sc: transmit secure channel
235 * @rx_sc: linked list of receive secure channels
236 */
237 struct macsec_secy {
238 struct net_device *netdev;
239 unsigned int n_rx_sc;
240 sci_t sci;
241 u16 key_len;
242 u16 icv_len;
243 enum macsec_validation_type validate_frames;
244 bool operational;
245 bool protect_frames;
246 bool replay_protect;
247 u32 replay_window;
248 struct macsec_tx_sc tx_sc;
249 struct macsec_rx_sc __rcu *rx_sc;
250 };
251
252 struct pcpu_secy_stats {
253 struct macsec_dev_stats stats;
254 struct u64_stats_sync syncp;
255 };
256
257 /**
258 * struct macsec_dev - private data
259 * @secy: SecY config
260 * @real_dev: pointer to underlying netdevice
261 * @stats: MACsec device stats
262 * @secys: linked list of SecY's on the underlying device
263 */
264 struct macsec_dev {
265 struct macsec_secy secy;
266 struct net_device *real_dev;
267 struct pcpu_secy_stats __percpu *stats;
268 struct list_head secys;
269 struct gro_cells gro_cells;
270 };
271
272 /**
273 * struct macsec_rxh_data - rx_handler private argument
274 * @secys: linked list of SecY's on this underlying device
275 */
276 struct macsec_rxh_data {
277 struct list_head secys;
278 };
279
macsec_priv(const struct net_device * dev)280 static struct macsec_dev *macsec_priv(const struct net_device *dev)
281 {
282 return (struct macsec_dev *)netdev_priv(dev);
283 }
284
macsec_data_rcu(const struct net_device * dev)285 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
286 {
287 return rcu_dereference_bh(dev->rx_handler_data);
288 }
289
macsec_data_rtnl(const struct net_device * dev)290 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
291 {
292 return rtnl_dereference(dev->rx_handler_data);
293 }
294
295 struct macsec_cb {
296 struct aead_request *req;
297 union {
298 struct macsec_tx_sa *tx_sa;
299 struct macsec_rx_sa *rx_sa;
300 };
301 u8 assoc_num;
302 bool valid;
303 bool has_sci;
304 };
305
macsec_rxsa_get(struct macsec_rx_sa __rcu * ptr)306 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
307 {
308 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
309
310 if (!sa || !sa->active)
311 return NULL;
312
313 if (!refcount_inc_not_zero(&sa->refcnt))
314 return NULL;
315
316 return sa;
317 }
318
free_rx_sc_rcu(struct rcu_head * head)319 static void free_rx_sc_rcu(struct rcu_head *head)
320 {
321 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
322
323 free_percpu(rx_sc->stats);
324 kfree(rx_sc);
325 }
326
macsec_rxsc_get(struct macsec_rx_sc * sc)327 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
328 {
329 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
330 }
331
macsec_rxsc_put(struct macsec_rx_sc * sc)332 static void macsec_rxsc_put(struct macsec_rx_sc *sc)
333 {
334 if (refcount_dec_and_test(&sc->refcnt))
335 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
336 }
337
free_rxsa(struct rcu_head * head)338 static void free_rxsa(struct rcu_head *head)
339 {
340 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
341
342 crypto_free_aead(sa->key.tfm);
343 free_percpu(sa->stats);
344 kfree(sa);
345 }
346
macsec_rxsa_put(struct macsec_rx_sa * sa)347 static void macsec_rxsa_put(struct macsec_rx_sa *sa)
348 {
349 if (refcount_dec_and_test(&sa->refcnt))
350 call_rcu(&sa->rcu, free_rxsa);
351 }
352
macsec_txsa_get(struct macsec_tx_sa __rcu * ptr)353 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
354 {
355 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
356
357 if (!sa || !sa->active)
358 return NULL;
359
360 if (!refcount_inc_not_zero(&sa->refcnt))
361 return NULL;
362
363 return sa;
364 }
365
free_txsa(struct rcu_head * head)366 static void free_txsa(struct rcu_head *head)
367 {
368 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
369
370 crypto_free_aead(sa->key.tfm);
371 free_percpu(sa->stats);
372 kfree(sa);
373 }
374
macsec_txsa_put(struct macsec_tx_sa * sa)375 static void macsec_txsa_put(struct macsec_tx_sa *sa)
376 {
377 if (refcount_dec_and_test(&sa->refcnt))
378 call_rcu(&sa->rcu, free_txsa);
379 }
380
macsec_skb_cb(struct sk_buff * skb)381 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
382 {
383 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
384 return (struct macsec_cb *)skb->cb;
385 }
386
387 #define MACSEC_PORT_ES (htons(0x0001))
388 #define MACSEC_PORT_SCB (0x0000)
389 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
390
391 #define MACSEC_GCM_AES_128_SAK_LEN 16
392 #define MACSEC_GCM_AES_256_SAK_LEN 32
393
394 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
395 #define DEFAULT_SEND_SCI true
396 #define DEFAULT_ENCRYPT false
397 #define DEFAULT_ENCODING_SA 0
398
send_sci(const struct macsec_secy * secy)399 static bool send_sci(const struct macsec_secy *secy)
400 {
401 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
402
403 return tx_sc->send_sci ||
404 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
405 }
406
make_sci(u8 * addr,__be16 port)407 static sci_t make_sci(u8 *addr, __be16 port)
408 {
409 sci_t sci;
410
411 memcpy(&sci, addr, ETH_ALEN);
412 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
413
414 return sci;
415 }
416
macsec_frame_sci(struct macsec_eth_header * hdr,bool sci_present)417 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
418 {
419 sci_t sci;
420
421 if (sci_present)
422 memcpy(&sci, hdr->secure_channel_id,
423 sizeof(hdr->secure_channel_id));
424 else
425 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
426
427 return sci;
428 }
429
macsec_sectag_len(bool sci_present)430 static unsigned int macsec_sectag_len(bool sci_present)
431 {
432 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
433 }
434
macsec_hdr_len(bool sci_present)435 static unsigned int macsec_hdr_len(bool sci_present)
436 {
437 return macsec_sectag_len(sci_present) + ETH_HLEN;
438 }
439
macsec_extra_len(bool sci_present)440 static unsigned int macsec_extra_len(bool sci_present)
441 {
442 return macsec_sectag_len(sci_present) + sizeof(__be16);
443 }
444
445 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
macsec_fill_sectag(struct macsec_eth_header * h,const struct macsec_secy * secy,u32 pn,bool sci_present)446 static void macsec_fill_sectag(struct macsec_eth_header *h,
447 const struct macsec_secy *secy, u32 pn,
448 bool sci_present)
449 {
450 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
451
452 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
453 h->eth.h_proto = htons(ETH_P_MACSEC);
454
455 if (sci_present) {
456 h->tci_an |= MACSEC_TCI_SC;
457 memcpy(&h->secure_channel_id, &secy->sci,
458 sizeof(h->secure_channel_id));
459 } else {
460 if (tx_sc->end_station)
461 h->tci_an |= MACSEC_TCI_ES;
462 if (tx_sc->scb)
463 h->tci_an |= MACSEC_TCI_SCB;
464 }
465
466 h->packet_number = htonl(pn);
467
468 /* with GCM, C/E clear for !encrypt, both set for encrypt */
469 if (tx_sc->encrypt)
470 h->tci_an |= MACSEC_TCI_CONFID;
471 else if (secy->icv_len != DEFAULT_ICV_LEN)
472 h->tci_an |= MACSEC_TCI_C;
473
474 h->tci_an |= tx_sc->encoding_sa;
475 }
476
macsec_set_shortlen(struct macsec_eth_header * h,size_t data_len)477 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
478 {
479 if (data_len < MIN_NON_SHORT_LEN)
480 h->short_length = data_len;
481 }
482
483 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
macsec_validate_skb(struct sk_buff * skb,u16 icv_len)484 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
485 {
486 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
487 int len = skb->len - 2 * ETH_ALEN;
488 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
489
490 /* a) It comprises at least 17 octets */
491 if (skb->len <= 16)
492 return false;
493
494 /* b) MACsec EtherType: already checked */
495
496 /* c) V bit is clear */
497 if (h->tci_an & MACSEC_TCI_VERSION)
498 return false;
499
500 /* d) ES or SCB => !SC */
501 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
502 (h->tci_an & MACSEC_TCI_SC))
503 return false;
504
505 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
506 if (h->unused)
507 return false;
508
509 /* rx.pn != 0 (figure 10-5) */
510 if (!h->packet_number)
511 return false;
512
513 /* length check, f) g) h) i) */
514 if (h->short_length)
515 return len == extra_len + h->short_length;
516 return len >= extra_len + MIN_NON_SHORT_LEN;
517 }
518
519 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
520 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
521
macsec_fill_iv(unsigned char * iv,sci_t sci,u32 pn)522 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
523 {
524 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
525
526 gcm_iv->sci = sci;
527 gcm_iv->pn = htonl(pn);
528 }
529
macsec_ethhdr(struct sk_buff * skb)530 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
531 {
532 return (struct macsec_eth_header *)skb_mac_header(skb);
533 }
534
tx_sa_update_pn(struct macsec_tx_sa * tx_sa,struct macsec_secy * secy)535 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
536 {
537 u32 pn;
538
539 spin_lock_bh(&tx_sa->lock);
540 pn = tx_sa->next_pn;
541
542 tx_sa->next_pn++;
543 if (tx_sa->next_pn == 0) {
544 pr_debug("PN wrapped, transitioning to !oper\n");
545 tx_sa->active = false;
546 if (secy->protect_frames)
547 secy->operational = false;
548 }
549 spin_unlock_bh(&tx_sa->lock);
550
551 return pn;
552 }
553
macsec_encrypt_finish(struct sk_buff * skb,struct net_device * dev)554 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
555 {
556 struct macsec_dev *macsec = netdev_priv(dev);
557
558 skb->dev = macsec->real_dev;
559 skb_reset_mac_header(skb);
560 skb->protocol = eth_hdr(skb)->h_proto;
561 }
562
macsec_count_tx(struct sk_buff * skb,struct macsec_tx_sc * tx_sc,struct macsec_tx_sa * tx_sa)563 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
564 struct macsec_tx_sa *tx_sa)
565 {
566 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
567
568 u64_stats_update_begin(&txsc_stats->syncp);
569 if (tx_sc->encrypt) {
570 txsc_stats->stats.OutOctetsEncrypted += skb->len;
571 txsc_stats->stats.OutPktsEncrypted++;
572 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
573 } else {
574 txsc_stats->stats.OutOctetsProtected += skb->len;
575 txsc_stats->stats.OutPktsProtected++;
576 this_cpu_inc(tx_sa->stats->OutPktsProtected);
577 }
578 u64_stats_update_end(&txsc_stats->syncp);
579 }
580
count_tx(struct net_device * dev,int ret,int len)581 static void count_tx(struct net_device *dev, int ret, int len)
582 {
583 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
584 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
585
586 u64_stats_update_begin(&stats->syncp);
587 stats->tx_packets++;
588 stats->tx_bytes += len;
589 u64_stats_update_end(&stats->syncp);
590 }
591 }
592
macsec_encrypt_done(struct crypto_async_request * base,int err)593 static void macsec_encrypt_done(struct crypto_async_request *base, int err)
594 {
595 struct sk_buff *skb = base->data;
596 struct net_device *dev = skb->dev;
597 struct macsec_dev *macsec = macsec_priv(dev);
598 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
599 int len, ret;
600
601 aead_request_free(macsec_skb_cb(skb)->req);
602
603 rcu_read_lock_bh();
604 macsec_encrypt_finish(skb, dev);
605 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
606 len = skb->len;
607 ret = dev_queue_xmit(skb);
608 count_tx(dev, ret, len);
609 rcu_read_unlock_bh();
610
611 macsec_txsa_put(sa);
612 dev_put(dev);
613 }
614
macsec_alloc_req(struct crypto_aead * tfm,unsigned char ** iv,struct scatterlist ** sg,int num_frags)615 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
616 unsigned char **iv,
617 struct scatterlist **sg,
618 int num_frags)
619 {
620 size_t size, iv_offset, sg_offset;
621 struct aead_request *req;
622 void *tmp;
623
624 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
625 iv_offset = size;
626 size += GCM_AES_IV_LEN;
627
628 size = ALIGN(size, __alignof__(struct scatterlist));
629 sg_offset = size;
630 size += sizeof(struct scatterlist) * num_frags;
631
632 tmp = kmalloc(size, GFP_ATOMIC);
633 if (!tmp)
634 return NULL;
635
636 *iv = (unsigned char *)(tmp + iv_offset);
637 *sg = (struct scatterlist *)(tmp + sg_offset);
638 req = tmp;
639
640 aead_request_set_tfm(req, tfm);
641
642 return req;
643 }
644
macsec_encrypt(struct sk_buff * skb,struct net_device * dev)645 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
646 struct net_device *dev)
647 {
648 int ret;
649 struct scatterlist *sg;
650 struct sk_buff *trailer;
651 unsigned char *iv;
652 struct ethhdr *eth;
653 struct macsec_eth_header *hh;
654 size_t unprotected_len;
655 struct aead_request *req;
656 struct macsec_secy *secy;
657 struct macsec_tx_sc *tx_sc;
658 struct macsec_tx_sa *tx_sa;
659 struct macsec_dev *macsec = macsec_priv(dev);
660 bool sci_present;
661 u32 pn;
662
663 secy = &macsec->secy;
664 tx_sc = &secy->tx_sc;
665
666 /* 10.5.1 TX SA assignment */
667 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
668 if (!tx_sa) {
669 secy->operational = false;
670 kfree_skb(skb);
671 return ERR_PTR(-EINVAL);
672 }
673
674 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
675 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
676 struct sk_buff *nskb = skb_copy_expand(skb,
677 MACSEC_NEEDED_HEADROOM,
678 MACSEC_NEEDED_TAILROOM,
679 GFP_ATOMIC);
680 if (likely(nskb)) {
681 consume_skb(skb);
682 skb = nskb;
683 } else {
684 macsec_txsa_put(tx_sa);
685 kfree_skb(skb);
686 return ERR_PTR(-ENOMEM);
687 }
688 } else {
689 skb = skb_unshare(skb, GFP_ATOMIC);
690 if (!skb) {
691 macsec_txsa_put(tx_sa);
692 return ERR_PTR(-ENOMEM);
693 }
694 }
695
696 unprotected_len = skb->len;
697 eth = eth_hdr(skb);
698 sci_present = send_sci(secy);
699 hh = skb_push(skb, macsec_extra_len(sci_present));
700 memmove(hh, eth, 2 * ETH_ALEN);
701
702 pn = tx_sa_update_pn(tx_sa, secy);
703 if (pn == 0) {
704 macsec_txsa_put(tx_sa);
705 kfree_skb(skb);
706 return ERR_PTR(-ENOLINK);
707 }
708 macsec_fill_sectag(hh, secy, pn, sci_present);
709 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
710
711 skb_put(skb, secy->icv_len);
712
713 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
714 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
715
716 u64_stats_update_begin(&secy_stats->syncp);
717 secy_stats->stats.OutPktsTooLong++;
718 u64_stats_update_end(&secy_stats->syncp);
719
720 macsec_txsa_put(tx_sa);
721 kfree_skb(skb);
722 return ERR_PTR(-EINVAL);
723 }
724
725 ret = skb_cow_data(skb, 0, &trailer);
726 if (unlikely(ret < 0)) {
727 macsec_txsa_put(tx_sa);
728 kfree_skb(skb);
729 return ERR_PTR(ret);
730 }
731
732 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
733 if (!req) {
734 macsec_txsa_put(tx_sa);
735 kfree_skb(skb);
736 return ERR_PTR(-ENOMEM);
737 }
738
739 macsec_fill_iv(iv, secy->sci, pn);
740
741 sg_init_table(sg, ret);
742 ret = skb_to_sgvec(skb, sg, 0, skb->len);
743 if (unlikely(ret < 0)) {
744 aead_request_free(req);
745 macsec_txsa_put(tx_sa);
746 kfree_skb(skb);
747 return ERR_PTR(ret);
748 }
749
750 if (tx_sc->encrypt) {
751 int len = skb->len - macsec_hdr_len(sci_present) -
752 secy->icv_len;
753 aead_request_set_crypt(req, sg, sg, len, iv);
754 aead_request_set_ad(req, macsec_hdr_len(sci_present));
755 } else {
756 aead_request_set_crypt(req, sg, sg, 0, iv);
757 aead_request_set_ad(req, skb->len - secy->icv_len);
758 }
759
760 macsec_skb_cb(skb)->req = req;
761 macsec_skb_cb(skb)->tx_sa = tx_sa;
762 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
763
764 dev_hold(skb->dev);
765 ret = crypto_aead_encrypt(req);
766 if (ret == -EINPROGRESS) {
767 return ERR_PTR(ret);
768 } else if (ret != 0) {
769 dev_put(skb->dev);
770 kfree_skb(skb);
771 aead_request_free(req);
772 macsec_txsa_put(tx_sa);
773 return ERR_PTR(-EINVAL);
774 }
775
776 dev_put(skb->dev);
777 aead_request_free(req);
778 macsec_txsa_put(tx_sa);
779
780 return skb;
781 }
782
macsec_post_decrypt(struct sk_buff * skb,struct macsec_secy * secy,u32 pn)783 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
784 {
785 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
786 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
787 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
788 u32 lowest_pn = 0;
789
790 spin_lock(&rx_sa->lock);
791 if (rx_sa->next_pn >= secy->replay_window)
792 lowest_pn = rx_sa->next_pn - secy->replay_window;
793
794 /* Now perform replay protection check again
795 * (see IEEE 802.1AE-2006 figure 10-5)
796 */
797 if (secy->replay_protect && pn < lowest_pn) {
798 spin_unlock(&rx_sa->lock);
799 u64_stats_update_begin(&rxsc_stats->syncp);
800 rxsc_stats->stats.InPktsLate++;
801 u64_stats_update_end(&rxsc_stats->syncp);
802 return false;
803 }
804
805 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
806 u64_stats_update_begin(&rxsc_stats->syncp);
807 if (hdr->tci_an & MACSEC_TCI_E)
808 rxsc_stats->stats.InOctetsDecrypted += skb->len;
809 else
810 rxsc_stats->stats.InOctetsValidated += skb->len;
811 u64_stats_update_end(&rxsc_stats->syncp);
812 }
813
814 if (!macsec_skb_cb(skb)->valid) {
815 spin_unlock(&rx_sa->lock);
816
817 /* 10.6.5 */
818 if (hdr->tci_an & MACSEC_TCI_C ||
819 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
820 u64_stats_update_begin(&rxsc_stats->syncp);
821 rxsc_stats->stats.InPktsNotValid++;
822 u64_stats_update_end(&rxsc_stats->syncp);
823 return false;
824 }
825
826 u64_stats_update_begin(&rxsc_stats->syncp);
827 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
828 rxsc_stats->stats.InPktsInvalid++;
829 this_cpu_inc(rx_sa->stats->InPktsInvalid);
830 } else if (pn < lowest_pn) {
831 rxsc_stats->stats.InPktsDelayed++;
832 } else {
833 rxsc_stats->stats.InPktsUnchecked++;
834 }
835 u64_stats_update_end(&rxsc_stats->syncp);
836 } else {
837 u64_stats_update_begin(&rxsc_stats->syncp);
838 if (pn < lowest_pn) {
839 rxsc_stats->stats.InPktsDelayed++;
840 } else {
841 rxsc_stats->stats.InPktsOK++;
842 this_cpu_inc(rx_sa->stats->InPktsOK);
843 }
844 u64_stats_update_end(&rxsc_stats->syncp);
845
846 if (pn >= rx_sa->next_pn)
847 rx_sa->next_pn = pn + 1;
848 spin_unlock(&rx_sa->lock);
849 }
850
851 return true;
852 }
853
macsec_reset_skb(struct sk_buff * skb,struct net_device * dev)854 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
855 {
856 skb->pkt_type = PACKET_HOST;
857 skb->protocol = eth_type_trans(skb, dev);
858
859 skb_reset_network_header(skb);
860 if (!skb_transport_header_was_set(skb))
861 skb_reset_transport_header(skb);
862 skb_reset_mac_len(skb);
863 }
864
macsec_finalize_skb(struct sk_buff * skb,u8 icv_len,u8 hdr_len)865 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
866 {
867 skb->ip_summed = CHECKSUM_NONE;
868 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
869 skb_pull(skb, hdr_len);
870 pskb_trim_unique(skb, skb->len - icv_len);
871 }
872
count_rx(struct net_device * dev,int len)873 static void count_rx(struct net_device *dev, int len)
874 {
875 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
876
877 u64_stats_update_begin(&stats->syncp);
878 stats->rx_packets++;
879 stats->rx_bytes += len;
880 u64_stats_update_end(&stats->syncp);
881 }
882
macsec_decrypt_done(struct crypto_async_request * base,int err)883 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
884 {
885 struct sk_buff *skb = base->data;
886 struct net_device *dev = skb->dev;
887 struct macsec_dev *macsec = macsec_priv(dev);
888 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
889 struct macsec_rx_sc *rx_sc = rx_sa->sc;
890 int len;
891 u32 pn;
892
893 aead_request_free(macsec_skb_cb(skb)->req);
894
895 if (!err)
896 macsec_skb_cb(skb)->valid = true;
897
898 rcu_read_lock_bh();
899 pn = ntohl(macsec_ethhdr(skb)->packet_number);
900 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
901 rcu_read_unlock_bh();
902 kfree_skb(skb);
903 goto out;
904 }
905
906 macsec_finalize_skb(skb, macsec->secy.icv_len,
907 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
908 macsec_reset_skb(skb, macsec->secy.netdev);
909
910 len = skb->len;
911 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
912 count_rx(dev, len);
913
914 rcu_read_unlock_bh();
915
916 out:
917 macsec_rxsa_put(rx_sa);
918 macsec_rxsc_put(rx_sc);
919 dev_put(dev);
920 }
921
macsec_decrypt(struct sk_buff * skb,struct net_device * dev,struct macsec_rx_sa * rx_sa,sci_t sci,struct macsec_secy * secy)922 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
923 struct net_device *dev,
924 struct macsec_rx_sa *rx_sa,
925 sci_t sci,
926 struct macsec_secy *secy)
927 {
928 int ret;
929 struct scatterlist *sg;
930 struct sk_buff *trailer;
931 unsigned char *iv;
932 struct aead_request *req;
933 struct macsec_eth_header *hdr;
934 u16 icv_len = secy->icv_len;
935
936 macsec_skb_cb(skb)->valid = false;
937 skb = skb_share_check(skb, GFP_ATOMIC);
938 if (!skb)
939 return ERR_PTR(-ENOMEM);
940
941 ret = skb_cow_data(skb, 0, &trailer);
942 if (unlikely(ret < 0)) {
943 kfree_skb(skb);
944 return ERR_PTR(ret);
945 }
946 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
947 if (!req) {
948 kfree_skb(skb);
949 return ERR_PTR(-ENOMEM);
950 }
951
952 hdr = (struct macsec_eth_header *)skb->data;
953 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
954
955 sg_init_table(sg, ret);
956 ret = skb_to_sgvec(skb, sg, 0, skb->len);
957 if (unlikely(ret < 0)) {
958 aead_request_free(req);
959 kfree_skb(skb);
960 return ERR_PTR(ret);
961 }
962
963 if (hdr->tci_an & MACSEC_TCI_E) {
964 /* confidentiality: ethernet + macsec header
965 * authenticated, encrypted payload
966 */
967 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
968
969 aead_request_set_crypt(req, sg, sg, len, iv);
970 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
971 skb = skb_unshare(skb, GFP_ATOMIC);
972 if (!skb) {
973 aead_request_free(req);
974 return ERR_PTR(-ENOMEM);
975 }
976 } else {
977 /* integrity only: all headers + data authenticated */
978 aead_request_set_crypt(req, sg, sg, icv_len, iv);
979 aead_request_set_ad(req, skb->len - icv_len);
980 }
981
982 macsec_skb_cb(skb)->req = req;
983 skb->dev = dev;
984 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
985
986 dev_hold(dev);
987 ret = crypto_aead_decrypt(req);
988 if (ret == -EINPROGRESS) {
989 return ERR_PTR(ret);
990 } else if (ret != 0) {
991 /* decryption/authentication failed
992 * 10.6 if validateFrames is disabled, deliver anyway
993 */
994 if (ret != -EBADMSG) {
995 kfree_skb(skb);
996 skb = ERR_PTR(ret);
997 }
998 } else {
999 macsec_skb_cb(skb)->valid = true;
1000 }
1001 dev_put(dev);
1002
1003 aead_request_free(req);
1004
1005 return skb;
1006 }
1007
find_rx_sc(struct macsec_secy * secy,sci_t sci)1008 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
1009 {
1010 struct macsec_rx_sc *rx_sc;
1011
1012 for_each_rxsc(secy, rx_sc) {
1013 if (rx_sc->sci == sci)
1014 return rx_sc;
1015 }
1016
1017 return NULL;
1018 }
1019
find_rx_sc_rtnl(struct macsec_secy * secy,sci_t sci)1020 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
1021 {
1022 struct macsec_rx_sc *rx_sc;
1023
1024 for_each_rxsc_rtnl(secy, rx_sc) {
1025 if (rx_sc->sci == sci)
1026 return rx_sc;
1027 }
1028
1029 return NULL;
1030 }
1031
handle_not_macsec(struct sk_buff * skb)1032 static void handle_not_macsec(struct sk_buff *skb)
1033 {
1034 struct macsec_rxh_data *rxd;
1035 struct macsec_dev *macsec;
1036
1037 rcu_read_lock();
1038 rxd = macsec_data_rcu(skb->dev);
1039
1040 /* 10.6 If the management control validateFrames is not
1041 * Strict, frames without a SecTAG are received, counted, and
1042 * delivered to the Controlled Port
1043 */
1044 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1045 struct sk_buff *nskb;
1046 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1047
1048 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1049 u64_stats_update_begin(&secy_stats->syncp);
1050 secy_stats->stats.InPktsNoTag++;
1051 u64_stats_update_end(&secy_stats->syncp);
1052 continue;
1053 }
1054
1055 /* deliver on this port */
1056 nskb = skb_clone(skb, GFP_ATOMIC);
1057 if (!nskb)
1058 break;
1059
1060 nskb->dev = macsec->secy.netdev;
1061
1062 if (netif_rx(nskb) == NET_RX_SUCCESS) {
1063 u64_stats_update_begin(&secy_stats->syncp);
1064 secy_stats->stats.InPktsUntagged++;
1065 u64_stats_update_end(&secy_stats->syncp);
1066 }
1067 }
1068
1069 rcu_read_unlock();
1070 }
1071
macsec_handle_frame(struct sk_buff ** pskb)1072 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1073 {
1074 struct sk_buff *skb = *pskb;
1075 struct net_device *dev = skb->dev;
1076 struct macsec_eth_header *hdr;
1077 struct macsec_secy *secy = NULL;
1078 struct macsec_rx_sc *rx_sc;
1079 struct macsec_rx_sa *rx_sa;
1080 struct macsec_rxh_data *rxd;
1081 struct macsec_dev *macsec;
1082 sci_t sci;
1083 u32 pn;
1084 bool cbit;
1085 struct pcpu_rx_sc_stats *rxsc_stats;
1086 struct pcpu_secy_stats *secy_stats;
1087 bool pulled_sci;
1088 int ret;
1089
1090 if (skb_headroom(skb) < ETH_HLEN)
1091 goto drop_direct;
1092
1093 hdr = macsec_ethhdr(skb);
1094 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1095 handle_not_macsec(skb);
1096
1097 /* and deliver to the uncontrolled port */
1098 return RX_HANDLER_PASS;
1099 }
1100
1101 skb = skb_unshare(skb, GFP_ATOMIC);
1102 *pskb = skb;
1103 if (!skb)
1104 return RX_HANDLER_CONSUMED;
1105
1106 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1107 if (!pulled_sci) {
1108 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1109 goto drop_direct;
1110 }
1111
1112 hdr = macsec_ethhdr(skb);
1113
1114 /* Frames with a SecTAG that has the TCI E bit set but the C
1115 * bit clear are discarded, as this reserved encoding is used
1116 * to identify frames with a SecTAG that are not to be
1117 * delivered to the Controlled Port.
1118 */
1119 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1120 return RX_HANDLER_PASS;
1121
1122 /* now, pull the extra length */
1123 if (hdr->tci_an & MACSEC_TCI_SC) {
1124 if (!pulled_sci)
1125 goto drop_direct;
1126 }
1127
1128 /* ethernet header is part of crypto processing */
1129 skb_push(skb, ETH_HLEN);
1130
1131 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1132 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1133 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1134
1135 rcu_read_lock();
1136 rxd = macsec_data_rcu(skb->dev);
1137
1138 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1139 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1140
1141 sc = sc ? macsec_rxsc_get(sc) : NULL;
1142
1143 if (sc) {
1144 secy = &macsec->secy;
1145 rx_sc = sc;
1146 break;
1147 }
1148 }
1149
1150 if (!secy)
1151 goto nosci;
1152
1153 dev = secy->netdev;
1154 macsec = macsec_priv(dev);
1155 secy_stats = this_cpu_ptr(macsec->stats);
1156 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1157
1158 if (!macsec_validate_skb(skb, secy->icv_len)) {
1159 u64_stats_update_begin(&secy_stats->syncp);
1160 secy_stats->stats.InPktsBadTag++;
1161 u64_stats_update_end(&secy_stats->syncp);
1162 goto drop_nosa;
1163 }
1164
1165 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1166 if (!rx_sa) {
1167 /* 10.6.1 if the SA is not in use */
1168
1169 /* If validateFrames is Strict or the C bit in the
1170 * SecTAG is set, discard
1171 */
1172 if (hdr->tci_an & MACSEC_TCI_C ||
1173 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1174 u64_stats_update_begin(&rxsc_stats->syncp);
1175 rxsc_stats->stats.InPktsNotUsingSA++;
1176 u64_stats_update_end(&rxsc_stats->syncp);
1177 goto drop_nosa;
1178 }
1179
1180 /* not Strict, the frame (with the SecTAG and ICV
1181 * removed) is delivered to the Controlled Port.
1182 */
1183 u64_stats_update_begin(&rxsc_stats->syncp);
1184 rxsc_stats->stats.InPktsUnusedSA++;
1185 u64_stats_update_end(&rxsc_stats->syncp);
1186 goto deliver;
1187 }
1188
1189 /* First, PN check to avoid decrypting obviously wrong packets */
1190 pn = ntohl(hdr->packet_number);
1191 if (secy->replay_protect) {
1192 bool late;
1193
1194 spin_lock(&rx_sa->lock);
1195 late = rx_sa->next_pn >= secy->replay_window &&
1196 pn < (rx_sa->next_pn - secy->replay_window);
1197 spin_unlock(&rx_sa->lock);
1198
1199 if (late) {
1200 u64_stats_update_begin(&rxsc_stats->syncp);
1201 rxsc_stats->stats.InPktsLate++;
1202 u64_stats_update_end(&rxsc_stats->syncp);
1203 goto drop;
1204 }
1205 }
1206
1207 macsec_skb_cb(skb)->rx_sa = rx_sa;
1208
1209 /* Disabled && !changed text => skip validation */
1210 if (hdr->tci_an & MACSEC_TCI_C ||
1211 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1212 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1213
1214 if (IS_ERR(skb)) {
1215 /* the decrypt callback needs the reference */
1216 if (PTR_ERR(skb) != -EINPROGRESS) {
1217 macsec_rxsa_put(rx_sa);
1218 macsec_rxsc_put(rx_sc);
1219 }
1220 rcu_read_unlock();
1221 *pskb = NULL;
1222 return RX_HANDLER_CONSUMED;
1223 }
1224
1225 if (!macsec_post_decrypt(skb, secy, pn))
1226 goto drop;
1227
1228 deliver:
1229 macsec_finalize_skb(skb, secy->icv_len,
1230 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1231 macsec_reset_skb(skb, secy->netdev);
1232
1233 if (rx_sa)
1234 macsec_rxsa_put(rx_sa);
1235 macsec_rxsc_put(rx_sc);
1236
1237 skb_orphan(skb);
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
macsec_alloc_tfm(char * key,int key_len,int icv_len)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
init_rx_sa(struct macsec_rx_sa * rx_sa,char * sak,int key_len,int icv_len)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
clear_rx_sa(struct macsec_rx_sa * rx_sa)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
free_rx_sc(struct macsec_rx_sc * rx_sc)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
del_rx_sc(struct macsec_secy * secy,sci_t sci)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
create_rx_sc(struct net_device * dev,sci_t sci)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
init_tx_sa(struct macsec_tx_sa * tx_sa,char * sak,int key_len,int icv_len)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
clear_tx_sa(struct macsec_tx_sa * tx_sa)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
get_dev_from_nl(struct net * net,struct nlattr ** attrs)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
nla_get_sci(const struct nlattr * nla)1473 static sci_t nla_get_sci(const struct nlattr *nla)
1474 {
1475 return (__force sci_t)nla_get_u64(nla);
1476 }
1477
nla_put_sci(struct sk_buff * skb,int attrtype,sci_t value,int padattr)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
get_txsa_from_nl(struct net * net,struct nlattr ** attrs,struct nlattr ** tb_sa,struct net_device ** devp,struct macsec_secy ** secyp,struct macsec_tx_sc ** scp,u8 * assoc_num)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
get_rxsc_from_nl(struct net * net,struct nlattr ** attrs,struct nlattr ** tb_rxsc,struct net_device ** devp,struct macsec_secy ** secyp)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
get_rxsa_from_nl(struct net * net,struct nlattr ** attrs,struct nlattr ** tb_rxsc,struct nlattr ** tb_sa,struct net_device ** devp,struct macsec_secy ** secyp,struct macsec_rx_sc ** scp,u8 * assoc_num)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 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1585 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1586 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1587 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1588 };
1589
1590 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1591 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1592 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1593 };
1594
1595 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1596 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1597 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1598 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1599 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1600 .len = MACSEC_KEYID_LEN, },
1601 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1602 .len = MACSEC_MAX_KEY_LEN, },
1603 };
1604
parse_sa_config(struct nlattr ** attrs,struct nlattr ** tb_sa)1605 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1606 {
1607 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1608 return -EINVAL;
1609
1610 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1611 return -EINVAL;
1612
1613 return 0;
1614 }
1615
parse_rxsc_config(struct nlattr ** attrs,struct nlattr ** tb_rxsc)1616 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1617 {
1618 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1619 return -EINVAL;
1620
1621 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1622 return -EINVAL;
1623
1624 return 0;
1625 }
1626
validate_add_rxsa(struct nlattr ** attrs)1627 static bool validate_add_rxsa(struct nlattr **attrs)
1628 {
1629 if (!attrs[MACSEC_SA_ATTR_AN] ||
1630 !attrs[MACSEC_SA_ATTR_KEY] ||
1631 !attrs[MACSEC_SA_ATTR_KEYID])
1632 return false;
1633
1634 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1635 return false;
1636
1637 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1638 return false;
1639
1640 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1641 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1642 return false;
1643 }
1644
1645 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1646 return false;
1647
1648 return true;
1649 }
1650
macsec_add_rxsa(struct sk_buff * skb,struct genl_info * info)1651 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1652 {
1653 struct net_device *dev;
1654 struct nlattr **attrs = info->attrs;
1655 struct macsec_secy *secy;
1656 struct macsec_rx_sc *rx_sc;
1657 struct macsec_rx_sa *rx_sa;
1658 unsigned char assoc_num;
1659 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1660 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1661 int err;
1662
1663 if (!attrs[MACSEC_ATTR_IFINDEX])
1664 return -EINVAL;
1665
1666 if (parse_sa_config(attrs, tb_sa))
1667 return -EINVAL;
1668
1669 if (parse_rxsc_config(attrs, tb_rxsc))
1670 return -EINVAL;
1671
1672 if (!validate_add_rxsa(tb_sa))
1673 return -EINVAL;
1674
1675 rtnl_lock();
1676 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1677 if (IS_ERR(rx_sc)) {
1678 rtnl_unlock();
1679 return PTR_ERR(rx_sc);
1680 }
1681
1682 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1683
1684 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1685 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1686 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1687 rtnl_unlock();
1688 return -EINVAL;
1689 }
1690
1691 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1692 if (rx_sa) {
1693 rtnl_unlock();
1694 return -EBUSY;
1695 }
1696
1697 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1698 if (!rx_sa) {
1699 rtnl_unlock();
1700 return -ENOMEM;
1701 }
1702
1703 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1704 secy->key_len, secy->icv_len);
1705 if (err < 0) {
1706 kfree(rx_sa);
1707 rtnl_unlock();
1708 return err;
1709 }
1710
1711 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1712 spin_lock_bh(&rx_sa->lock);
1713 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1714 spin_unlock_bh(&rx_sa->lock);
1715 }
1716
1717 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1718 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1719
1720 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1721 rx_sa->sc = rx_sc;
1722 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1723
1724 rtnl_unlock();
1725
1726 return 0;
1727 }
1728
validate_add_rxsc(struct nlattr ** attrs)1729 static bool validate_add_rxsc(struct nlattr **attrs)
1730 {
1731 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1732 return false;
1733
1734 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1735 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1736 return false;
1737 }
1738
1739 return true;
1740 }
1741
macsec_add_rxsc(struct sk_buff * skb,struct genl_info * info)1742 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1743 {
1744 struct net_device *dev;
1745 sci_t sci = MACSEC_UNDEF_SCI;
1746 struct nlattr **attrs = info->attrs;
1747 struct macsec_rx_sc *rx_sc;
1748 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1749
1750 if (!attrs[MACSEC_ATTR_IFINDEX])
1751 return -EINVAL;
1752
1753 if (parse_rxsc_config(attrs, tb_rxsc))
1754 return -EINVAL;
1755
1756 if (!validate_add_rxsc(tb_rxsc))
1757 return -EINVAL;
1758
1759 rtnl_lock();
1760 dev = get_dev_from_nl(genl_info_net(info), attrs);
1761 if (IS_ERR(dev)) {
1762 rtnl_unlock();
1763 return PTR_ERR(dev);
1764 }
1765
1766 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1767
1768 rx_sc = create_rx_sc(dev, sci);
1769 if (IS_ERR(rx_sc)) {
1770 rtnl_unlock();
1771 return PTR_ERR(rx_sc);
1772 }
1773
1774 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1775 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1776
1777 rtnl_unlock();
1778
1779 return 0;
1780 }
1781
validate_add_txsa(struct nlattr ** attrs)1782 static bool validate_add_txsa(struct nlattr **attrs)
1783 {
1784 if (!attrs[MACSEC_SA_ATTR_AN] ||
1785 !attrs[MACSEC_SA_ATTR_PN] ||
1786 !attrs[MACSEC_SA_ATTR_KEY] ||
1787 !attrs[MACSEC_SA_ATTR_KEYID])
1788 return false;
1789
1790 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1791 return false;
1792
1793 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1794 return false;
1795
1796 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1797 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1798 return false;
1799 }
1800
1801 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1802 return false;
1803
1804 return true;
1805 }
1806
macsec_add_txsa(struct sk_buff * skb,struct genl_info * info)1807 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1808 {
1809 struct net_device *dev;
1810 struct nlattr **attrs = info->attrs;
1811 struct macsec_secy *secy;
1812 struct macsec_tx_sc *tx_sc;
1813 struct macsec_tx_sa *tx_sa;
1814 unsigned char assoc_num;
1815 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1816 int err;
1817
1818 if (!attrs[MACSEC_ATTR_IFINDEX])
1819 return -EINVAL;
1820
1821 if (parse_sa_config(attrs, tb_sa))
1822 return -EINVAL;
1823
1824 if (!validate_add_txsa(tb_sa))
1825 return -EINVAL;
1826
1827 rtnl_lock();
1828 dev = get_dev_from_nl(genl_info_net(info), attrs);
1829 if (IS_ERR(dev)) {
1830 rtnl_unlock();
1831 return PTR_ERR(dev);
1832 }
1833
1834 secy = &macsec_priv(dev)->secy;
1835 tx_sc = &secy->tx_sc;
1836
1837 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1838
1839 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1840 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1841 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1842 rtnl_unlock();
1843 return -EINVAL;
1844 }
1845
1846 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1847 if (tx_sa) {
1848 rtnl_unlock();
1849 return -EBUSY;
1850 }
1851
1852 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1853 if (!tx_sa) {
1854 rtnl_unlock();
1855 return -ENOMEM;
1856 }
1857
1858 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1859 secy->key_len, secy->icv_len);
1860 if (err < 0) {
1861 kfree(tx_sa);
1862 rtnl_unlock();
1863 return err;
1864 }
1865
1866 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1867
1868 spin_lock_bh(&tx_sa->lock);
1869 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1870 spin_unlock_bh(&tx_sa->lock);
1871
1872 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1873 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1874
1875 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1876 secy->operational = true;
1877
1878 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1879
1880 rtnl_unlock();
1881
1882 return 0;
1883 }
1884
macsec_del_rxsa(struct sk_buff * skb,struct genl_info * info)1885 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1886 {
1887 struct nlattr **attrs = info->attrs;
1888 struct net_device *dev;
1889 struct macsec_secy *secy;
1890 struct macsec_rx_sc *rx_sc;
1891 struct macsec_rx_sa *rx_sa;
1892 u8 assoc_num;
1893 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1894 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1895
1896 if (!attrs[MACSEC_ATTR_IFINDEX])
1897 return -EINVAL;
1898
1899 if (parse_sa_config(attrs, tb_sa))
1900 return -EINVAL;
1901
1902 if (parse_rxsc_config(attrs, tb_rxsc))
1903 return -EINVAL;
1904
1905 rtnl_lock();
1906 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1907 &dev, &secy, &rx_sc, &assoc_num);
1908 if (IS_ERR(rx_sa)) {
1909 rtnl_unlock();
1910 return PTR_ERR(rx_sa);
1911 }
1912
1913 if (rx_sa->active) {
1914 rtnl_unlock();
1915 return -EBUSY;
1916 }
1917
1918 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1919 clear_rx_sa(rx_sa);
1920
1921 rtnl_unlock();
1922
1923 return 0;
1924 }
1925
macsec_del_rxsc(struct sk_buff * skb,struct genl_info * info)1926 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1927 {
1928 struct nlattr **attrs = info->attrs;
1929 struct net_device *dev;
1930 struct macsec_secy *secy;
1931 struct macsec_rx_sc *rx_sc;
1932 sci_t sci;
1933 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1934
1935 if (!attrs[MACSEC_ATTR_IFINDEX])
1936 return -EINVAL;
1937
1938 if (parse_rxsc_config(attrs, tb_rxsc))
1939 return -EINVAL;
1940
1941 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1942 return -EINVAL;
1943
1944 rtnl_lock();
1945 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1946 if (IS_ERR(dev)) {
1947 rtnl_unlock();
1948 return PTR_ERR(dev);
1949 }
1950
1951 secy = &macsec_priv(dev)->secy;
1952 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1953
1954 rx_sc = del_rx_sc(secy, sci);
1955 if (!rx_sc) {
1956 rtnl_unlock();
1957 return -ENODEV;
1958 }
1959
1960 free_rx_sc(rx_sc);
1961 rtnl_unlock();
1962
1963 return 0;
1964 }
1965
macsec_del_txsa(struct sk_buff * skb,struct genl_info * info)1966 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1967 {
1968 struct nlattr **attrs = info->attrs;
1969 struct net_device *dev;
1970 struct macsec_secy *secy;
1971 struct macsec_tx_sc *tx_sc;
1972 struct macsec_tx_sa *tx_sa;
1973 u8 assoc_num;
1974 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1975
1976 if (!attrs[MACSEC_ATTR_IFINDEX])
1977 return -EINVAL;
1978
1979 if (parse_sa_config(attrs, tb_sa))
1980 return -EINVAL;
1981
1982 rtnl_lock();
1983 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1984 &dev, &secy, &tx_sc, &assoc_num);
1985 if (IS_ERR(tx_sa)) {
1986 rtnl_unlock();
1987 return PTR_ERR(tx_sa);
1988 }
1989
1990 if (tx_sa->active) {
1991 rtnl_unlock();
1992 return -EBUSY;
1993 }
1994
1995 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
1996 clear_tx_sa(tx_sa);
1997
1998 rtnl_unlock();
1999
2000 return 0;
2001 }
2002
validate_upd_sa(struct nlattr ** attrs)2003 static bool validate_upd_sa(struct nlattr **attrs)
2004 {
2005 if (!attrs[MACSEC_SA_ATTR_AN] ||
2006 attrs[MACSEC_SA_ATTR_KEY] ||
2007 attrs[MACSEC_SA_ATTR_KEYID])
2008 return false;
2009
2010 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2011 return false;
2012
2013 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
2014 return false;
2015
2016 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2017 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2018 return false;
2019 }
2020
2021 return true;
2022 }
2023
macsec_upd_txsa(struct sk_buff * skb,struct genl_info * info)2024 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2025 {
2026 struct nlattr **attrs = info->attrs;
2027 struct net_device *dev;
2028 struct macsec_secy *secy;
2029 struct macsec_tx_sc *tx_sc;
2030 struct macsec_tx_sa *tx_sa;
2031 u8 assoc_num;
2032 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2033
2034 if (!attrs[MACSEC_ATTR_IFINDEX])
2035 return -EINVAL;
2036
2037 if (parse_sa_config(attrs, tb_sa))
2038 return -EINVAL;
2039
2040 if (!validate_upd_sa(tb_sa))
2041 return -EINVAL;
2042
2043 rtnl_lock();
2044 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2045 &dev, &secy, &tx_sc, &assoc_num);
2046 if (IS_ERR(tx_sa)) {
2047 rtnl_unlock();
2048 return PTR_ERR(tx_sa);
2049 }
2050
2051 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2052 spin_lock_bh(&tx_sa->lock);
2053 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2054 spin_unlock_bh(&tx_sa->lock);
2055 }
2056
2057 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2058 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2059
2060 if (assoc_num == tx_sc->encoding_sa)
2061 secy->operational = tx_sa->active;
2062
2063 rtnl_unlock();
2064
2065 return 0;
2066 }
2067
macsec_upd_rxsa(struct sk_buff * skb,struct genl_info * info)2068 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2069 {
2070 struct nlattr **attrs = info->attrs;
2071 struct net_device *dev;
2072 struct macsec_secy *secy;
2073 struct macsec_rx_sc *rx_sc;
2074 struct macsec_rx_sa *rx_sa;
2075 u8 assoc_num;
2076 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2077 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2078
2079 if (!attrs[MACSEC_ATTR_IFINDEX])
2080 return -EINVAL;
2081
2082 if (parse_rxsc_config(attrs, tb_rxsc))
2083 return -EINVAL;
2084
2085 if (parse_sa_config(attrs, tb_sa))
2086 return -EINVAL;
2087
2088 if (!validate_upd_sa(tb_sa))
2089 return -EINVAL;
2090
2091 rtnl_lock();
2092 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2093 &dev, &secy, &rx_sc, &assoc_num);
2094 if (IS_ERR(rx_sa)) {
2095 rtnl_unlock();
2096 return PTR_ERR(rx_sa);
2097 }
2098
2099 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2100 spin_lock_bh(&rx_sa->lock);
2101 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2102 spin_unlock_bh(&rx_sa->lock);
2103 }
2104
2105 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2106 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2107
2108 rtnl_unlock();
2109 return 0;
2110 }
2111
macsec_upd_rxsc(struct sk_buff * skb,struct genl_info * info)2112 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2113 {
2114 struct nlattr **attrs = info->attrs;
2115 struct net_device *dev;
2116 struct macsec_secy *secy;
2117 struct macsec_rx_sc *rx_sc;
2118 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2119
2120 if (!attrs[MACSEC_ATTR_IFINDEX])
2121 return -EINVAL;
2122
2123 if (parse_rxsc_config(attrs, tb_rxsc))
2124 return -EINVAL;
2125
2126 if (!validate_add_rxsc(tb_rxsc))
2127 return -EINVAL;
2128
2129 rtnl_lock();
2130 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2131 if (IS_ERR(rx_sc)) {
2132 rtnl_unlock();
2133 return PTR_ERR(rx_sc);
2134 }
2135
2136 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2137 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2138
2139 if (rx_sc->active != new)
2140 secy->n_rx_sc += new ? 1 : -1;
2141
2142 rx_sc->active = new;
2143 }
2144
2145 rtnl_unlock();
2146
2147 return 0;
2148 }
2149
copy_tx_sa_stats(struct sk_buff * skb,struct macsec_tx_sa_stats __percpu * pstats)2150 static int copy_tx_sa_stats(struct sk_buff *skb,
2151 struct macsec_tx_sa_stats __percpu *pstats)
2152 {
2153 struct macsec_tx_sa_stats sum = {0, };
2154 int cpu;
2155
2156 for_each_possible_cpu(cpu) {
2157 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2158
2159 sum.OutPktsProtected += stats->OutPktsProtected;
2160 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2161 }
2162
2163 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2164 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2165 return -EMSGSIZE;
2166
2167 return 0;
2168 }
2169
2170 static noinline_for_stack int
copy_rx_sa_stats(struct sk_buff * skb,struct macsec_rx_sa_stats __percpu * pstats)2171 copy_rx_sa_stats(struct sk_buff *skb,
2172 struct macsec_rx_sa_stats __percpu *pstats)
2173 {
2174 struct macsec_rx_sa_stats sum = {0, };
2175 int cpu;
2176
2177 for_each_possible_cpu(cpu) {
2178 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2179
2180 sum.InPktsOK += stats->InPktsOK;
2181 sum.InPktsInvalid += stats->InPktsInvalid;
2182 sum.InPktsNotValid += stats->InPktsNotValid;
2183 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2184 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2185 }
2186
2187 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2188 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2189 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2190 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2191 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2192 return -EMSGSIZE;
2193
2194 return 0;
2195 }
2196
2197 static noinline_for_stack int
copy_rx_sc_stats(struct sk_buff * skb,struct pcpu_rx_sc_stats __percpu * pstats)2198 copy_rx_sc_stats(struct sk_buff *skb, struct pcpu_rx_sc_stats __percpu *pstats)
2199 {
2200 struct macsec_rx_sc_stats sum = {0, };
2201 int cpu;
2202
2203 for_each_possible_cpu(cpu) {
2204 const struct pcpu_rx_sc_stats *stats;
2205 struct macsec_rx_sc_stats tmp;
2206 unsigned int start;
2207
2208 stats = per_cpu_ptr(pstats, cpu);
2209 do {
2210 start = u64_stats_fetch_begin_irq(&stats->syncp);
2211 memcpy(&tmp, &stats->stats, sizeof(tmp));
2212 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2213
2214 sum.InOctetsValidated += tmp.InOctetsValidated;
2215 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2216 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2217 sum.InPktsDelayed += tmp.InPktsDelayed;
2218 sum.InPktsOK += tmp.InPktsOK;
2219 sum.InPktsInvalid += tmp.InPktsInvalid;
2220 sum.InPktsLate += tmp.InPktsLate;
2221 sum.InPktsNotValid += tmp.InPktsNotValid;
2222 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2223 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2224 }
2225
2226 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2227 sum.InOctetsValidated,
2228 MACSEC_RXSC_STATS_ATTR_PAD) ||
2229 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2230 sum.InOctetsDecrypted,
2231 MACSEC_RXSC_STATS_ATTR_PAD) ||
2232 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2233 sum.InPktsUnchecked,
2234 MACSEC_RXSC_STATS_ATTR_PAD) ||
2235 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2236 sum.InPktsDelayed,
2237 MACSEC_RXSC_STATS_ATTR_PAD) ||
2238 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2239 sum.InPktsOK,
2240 MACSEC_RXSC_STATS_ATTR_PAD) ||
2241 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2242 sum.InPktsInvalid,
2243 MACSEC_RXSC_STATS_ATTR_PAD) ||
2244 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2245 sum.InPktsLate,
2246 MACSEC_RXSC_STATS_ATTR_PAD) ||
2247 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2248 sum.InPktsNotValid,
2249 MACSEC_RXSC_STATS_ATTR_PAD) ||
2250 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2251 sum.InPktsNotUsingSA,
2252 MACSEC_RXSC_STATS_ATTR_PAD) ||
2253 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2254 sum.InPktsUnusedSA,
2255 MACSEC_RXSC_STATS_ATTR_PAD))
2256 return -EMSGSIZE;
2257
2258 return 0;
2259 }
2260
2261 static noinline_for_stack int
copy_tx_sc_stats(struct sk_buff * skb,struct pcpu_tx_sc_stats __percpu * pstats)2262 copy_tx_sc_stats(struct sk_buff *skb, struct pcpu_tx_sc_stats __percpu *pstats)
2263 {
2264 struct macsec_tx_sc_stats sum = {0, };
2265 int cpu;
2266
2267 for_each_possible_cpu(cpu) {
2268 const struct pcpu_tx_sc_stats *stats;
2269 struct macsec_tx_sc_stats tmp;
2270 unsigned int start;
2271
2272 stats = per_cpu_ptr(pstats, cpu);
2273 do {
2274 start = u64_stats_fetch_begin_irq(&stats->syncp);
2275 memcpy(&tmp, &stats->stats, sizeof(tmp));
2276 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2277
2278 sum.OutPktsProtected += tmp.OutPktsProtected;
2279 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2280 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2281 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2282 }
2283
2284 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2285 sum.OutPktsProtected,
2286 MACSEC_TXSC_STATS_ATTR_PAD) ||
2287 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2288 sum.OutPktsEncrypted,
2289 MACSEC_TXSC_STATS_ATTR_PAD) ||
2290 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2291 sum.OutOctetsProtected,
2292 MACSEC_TXSC_STATS_ATTR_PAD) ||
2293 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2294 sum.OutOctetsEncrypted,
2295 MACSEC_TXSC_STATS_ATTR_PAD))
2296 return -EMSGSIZE;
2297
2298 return 0;
2299 }
2300
2301 static noinline_for_stack int
copy_secy_stats(struct sk_buff * skb,struct pcpu_secy_stats __percpu * pstats)2302 copy_secy_stats(struct sk_buff *skb, struct pcpu_secy_stats __percpu *pstats)
2303 {
2304 struct macsec_dev_stats sum = {0, };
2305 int cpu;
2306
2307 for_each_possible_cpu(cpu) {
2308 const struct pcpu_secy_stats *stats;
2309 struct macsec_dev_stats tmp;
2310 unsigned int start;
2311
2312 stats = per_cpu_ptr(pstats, cpu);
2313 do {
2314 start = u64_stats_fetch_begin_irq(&stats->syncp);
2315 memcpy(&tmp, &stats->stats, sizeof(tmp));
2316 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2317
2318 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2319 sum.InPktsUntagged += tmp.InPktsUntagged;
2320 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2321 sum.InPktsNoTag += tmp.InPktsNoTag;
2322 sum.InPktsBadTag += tmp.InPktsBadTag;
2323 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2324 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2325 sum.InPktsOverrun += tmp.InPktsOverrun;
2326 }
2327
2328 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2329 sum.OutPktsUntagged,
2330 MACSEC_SECY_STATS_ATTR_PAD) ||
2331 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2332 sum.InPktsUntagged,
2333 MACSEC_SECY_STATS_ATTR_PAD) ||
2334 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2335 sum.OutPktsTooLong,
2336 MACSEC_SECY_STATS_ATTR_PAD) ||
2337 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2338 sum.InPktsNoTag,
2339 MACSEC_SECY_STATS_ATTR_PAD) ||
2340 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2341 sum.InPktsBadTag,
2342 MACSEC_SECY_STATS_ATTR_PAD) ||
2343 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2344 sum.InPktsUnknownSCI,
2345 MACSEC_SECY_STATS_ATTR_PAD) ||
2346 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2347 sum.InPktsNoSCI,
2348 MACSEC_SECY_STATS_ATTR_PAD) ||
2349 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2350 sum.InPktsOverrun,
2351 MACSEC_SECY_STATS_ATTR_PAD))
2352 return -EMSGSIZE;
2353
2354 return 0;
2355 }
2356
nla_put_secy(struct macsec_secy * secy,struct sk_buff * skb)2357 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2358 {
2359 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2360 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
2361 MACSEC_ATTR_SECY);
2362 u64 csid;
2363
2364 if (!secy_nest)
2365 return 1;
2366
2367 switch (secy->key_len) {
2368 case MACSEC_GCM_AES_128_SAK_LEN:
2369 csid = MACSEC_DEFAULT_CIPHER_ID;
2370 break;
2371 case MACSEC_GCM_AES_256_SAK_LEN:
2372 csid = MACSEC_CIPHER_ID_GCM_AES_256;
2373 break;
2374 default:
2375 goto cancel;
2376 }
2377
2378 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2379 MACSEC_SECY_ATTR_PAD) ||
2380 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2381 csid, MACSEC_SECY_ATTR_PAD) ||
2382 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2383 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2384 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2385 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2386 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2387 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2388 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2389 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2390 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2391 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2392 goto cancel;
2393
2394 if (secy->replay_protect) {
2395 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2396 goto cancel;
2397 }
2398
2399 nla_nest_end(skb, secy_nest);
2400 return 0;
2401
2402 cancel:
2403 nla_nest_cancel(skb, secy_nest);
2404 return 1;
2405 }
2406
2407 static noinline_for_stack int
dump_secy(struct macsec_secy * secy,struct net_device * dev,struct sk_buff * skb,struct netlink_callback * cb)2408 dump_secy(struct macsec_secy *secy, struct net_device *dev,
2409 struct sk_buff *skb, struct netlink_callback *cb)
2410 {
2411 struct macsec_rx_sc *rx_sc;
2412 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2413 struct nlattr *txsa_list, *rxsc_list;
2414 int i, j;
2415 void *hdr;
2416 struct nlattr *attr;
2417
2418 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2419 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2420 if (!hdr)
2421 return -EMSGSIZE;
2422
2423 genl_dump_check_consistent(cb, hdr);
2424
2425 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2426 goto nla_put_failure;
2427
2428 if (nla_put_secy(secy, skb))
2429 goto nla_put_failure;
2430
2431 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
2432 if (!attr)
2433 goto nla_put_failure;
2434 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2435 nla_nest_cancel(skb, attr);
2436 goto nla_put_failure;
2437 }
2438 nla_nest_end(skb, attr);
2439
2440 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
2441 if (!attr)
2442 goto nla_put_failure;
2443 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2444 nla_nest_cancel(skb, attr);
2445 goto nla_put_failure;
2446 }
2447 nla_nest_end(skb, attr);
2448
2449 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
2450 if (!txsa_list)
2451 goto nla_put_failure;
2452 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2453 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2454 struct nlattr *txsa_nest;
2455
2456 if (!tx_sa)
2457 continue;
2458
2459 txsa_nest = nla_nest_start_noflag(skb, j++);
2460 if (!txsa_nest) {
2461 nla_nest_cancel(skb, txsa_list);
2462 goto nla_put_failure;
2463 }
2464
2465 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2466 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2467 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2468 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2469 nla_nest_cancel(skb, txsa_nest);
2470 nla_nest_cancel(skb, txsa_list);
2471 goto nla_put_failure;
2472 }
2473
2474 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
2475 if (!attr) {
2476 nla_nest_cancel(skb, txsa_nest);
2477 nla_nest_cancel(skb, txsa_list);
2478 goto nla_put_failure;
2479 }
2480 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2481 nla_nest_cancel(skb, attr);
2482 nla_nest_cancel(skb, txsa_nest);
2483 nla_nest_cancel(skb, txsa_list);
2484 goto nla_put_failure;
2485 }
2486 nla_nest_end(skb, attr);
2487
2488 nla_nest_end(skb, txsa_nest);
2489 }
2490 nla_nest_end(skb, txsa_list);
2491
2492 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
2493 if (!rxsc_list)
2494 goto nla_put_failure;
2495
2496 j = 1;
2497 for_each_rxsc_rtnl(secy, rx_sc) {
2498 int k;
2499 struct nlattr *rxsa_list;
2500 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
2501
2502 if (!rxsc_nest) {
2503 nla_nest_cancel(skb, rxsc_list);
2504 goto nla_put_failure;
2505 }
2506
2507 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2508 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
2509 MACSEC_RXSC_ATTR_PAD)) {
2510 nla_nest_cancel(skb, rxsc_nest);
2511 nla_nest_cancel(skb, rxsc_list);
2512 goto nla_put_failure;
2513 }
2514
2515 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
2516 if (!attr) {
2517 nla_nest_cancel(skb, rxsc_nest);
2518 nla_nest_cancel(skb, rxsc_list);
2519 goto nla_put_failure;
2520 }
2521 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2522 nla_nest_cancel(skb, attr);
2523 nla_nest_cancel(skb, rxsc_nest);
2524 nla_nest_cancel(skb, rxsc_list);
2525 goto nla_put_failure;
2526 }
2527 nla_nest_end(skb, attr);
2528
2529 rxsa_list = nla_nest_start_noflag(skb,
2530 MACSEC_RXSC_ATTR_SA_LIST);
2531 if (!rxsa_list) {
2532 nla_nest_cancel(skb, rxsc_nest);
2533 nla_nest_cancel(skb, rxsc_list);
2534 goto nla_put_failure;
2535 }
2536
2537 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2538 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2539 struct nlattr *rxsa_nest;
2540
2541 if (!rx_sa)
2542 continue;
2543
2544 rxsa_nest = nla_nest_start_noflag(skb, k++);
2545 if (!rxsa_nest) {
2546 nla_nest_cancel(skb, rxsa_list);
2547 nla_nest_cancel(skb, rxsc_nest);
2548 nla_nest_cancel(skb, rxsc_list);
2549 goto nla_put_failure;
2550 }
2551
2552 attr = nla_nest_start_noflag(skb,
2553 MACSEC_SA_ATTR_STATS);
2554 if (!attr) {
2555 nla_nest_cancel(skb, rxsa_list);
2556 nla_nest_cancel(skb, rxsc_nest);
2557 nla_nest_cancel(skb, rxsc_list);
2558 goto nla_put_failure;
2559 }
2560 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2561 nla_nest_cancel(skb, attr);
2562 nla_nest_cancel(skb, rxsa_list);
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, attr);
2568
2569 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2570 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2571 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2572 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2573 nla_nest_cancel(skb, rxsa_nest);
2574 nla_nest_cancel(skb, rxsc_nest);
2575 nla_nest_cancel(skb, rxsc_list);
2576 goto nla_put_failure;
2577 }
2578 nla_nest_end(skb, rxsa_nest);
2579 }
2580
2581 nla_nest_end(skb, rxsa_list);
2582 nla_nest_end(skb, rxsc_nest);
2583 }
2584
2585 nla_nest_end(skb, rxsc_list);
2586
2587 genlmsg_end(skb, hdr);
2588
2589 return 0;
2590
2591 nla_put_failure:
2592 genlmsg_cancel(skb, hdr);
2593 return -EMSGSIZE;
2594 }
2595
2596 static int macsec_generation = 1; /* protected by RTNL */
2597
macsec_dump_txsc(struct sk_buff * skb,struct netlink_callback * cb)2598 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2599 {
2600 struct net *net = sock_net(skb->sk);
2601 struct net_device *dev;
2602 int dev_idx, d;
2603
2604 dev_idx = cb->args[0];
2605
2606 d = 0;
2607 rtnl_lock();
2608
2609 cb->seq = macsec_generation;
2610
2611 for_each_netdev(net, dev) {
2612 struct macsec_secy *secy;
2613
2614 if (d < dev_idx)
2615 goto next;
2616
2617 if (!netif_is_macsec(dev))
2618 goto next;
2619
2620 secy = &macsec_priv(dev)->secy;
2621 if (dump_secy(secy, dev, skb, cb) < 0)
2622 goto done;
2623 next:
2624 d++;
2625 }
2626
2627 done:
2628 rtnl_unlock();
2629 cb->args[0] = d;
2630 return skb->len;
2631 }
2632
2633 static const struct genl_ops macsec_genl_ops[] = {
2634 {
2635 .cmd = MACSEC_CMD_GET_TXSC,
2636 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2637 .dumpit = macsec_dump_txsc,
2638 },
2639 {
2640 .cmd = MACSEC_CMD_ADD_RXSC,
2641 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2642 .doit = macsec_add_rxsc,
2643 .flags = GENL_ADMIN_PERM,
2644 },
2645 {
2646 .cmd = MACSEC_CMD_DEL_RXSC,
2647 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2648 .doit = macsec_del_rxsc,
2649 .flags = GENL_ADMIN_PERM,
2650 },
2651 {
2652 .cmd = MACSEC_CMD_UPD_RXSC,
2653 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2654 .doit = macsec_upd_rxsc,
2655 .flags = GENL_ADMIN_PERM,
2656 },
2657 {
2658 .cmd = MACSEC_CMD_ADD_TXSA,
2659 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2660 .doit = macsec_add_txsa,
2661 .flags = GENL_ADMIN_PERM,
2662 },
2663 {
2664 .cmd = MACSEC_CMD_DEL_TXSA,
2665 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2666 .doit = macsec_del_txsa,
2667 .flags = GENL_ADMIN_PERM,
2668 },
2669 {
2670 .cmd = MACSEC_CMD_UPD_TXSA,
2671 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2672 .doit = macsec_upd_txsa,
2673 .flags = GENL_ADMIN_PERM,
2674 },
2675 {
2676 .cmd = MACSEC_CMD_ADD_RXSA,
2677 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2678 .doit = macsec_add_rxsa,
2679 .flags = GENL_ADMIN_PERM,
2680 },
2681 {
2682 .cmd = MACSEC_CMD_DEL_RXSA,
2683 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2684 .doit = macsec_del_rxsa,
2685 .flags = GENL_ADMIN_PERM,
2686 },
2687 {
2688 .cmd = MACSEC_CMD_UPD_RXSA,
2689 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2690 .doit = macsec_upd_rxsa,
2691 .flags = GENL_ADMIN_PERM,
2692 },
2693 };
2694
2695 static struct genl_family macsec_fam __ro_after_init = {
2696 .name = MACSEC_GENL_NAME,
2697 .hdrsize = 0,
2698 .version = MACSEC_GENL_VERSION,
2699 .maxattr = MACSEC_ATTR_MAX,
2700 .policy = macsec_genl_policy,
2701 .netnsok = true,
2702 .module = THIS_MODULE,
2703 .ops = macsec_genl_ops,
2704 .n_ops = ARRAY_SIZE(macsec_genl_ops),
2705 };
2706
macsec_start_xmit(struct sk_buff * skb,struct net_device * dev)2707 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2708 struct net_device *dev)
2709 {
2710 struct macsec_dev *macsec = netdev_priv(dev);
2711 struct macsec_secy *secy = &macsec->secy;
2712 struct pcpu_secy_stats *secy_stats;
2713 int ret, len;
2714
2715 /* 10.5 */
2716 if (!secy->protect_frames) {
2717 secy_stats = this_cpu_ptr(macsec->stats);
2718 u64_stats_update_begin(&secy_stats->syncp);
2719 secy_stats->stats.OutPktsUntagged++;
2720 u64_stats_update_end(&secy_stats->syncp);
2721 skb->dev = macsec->real_dev;
2722 len = skb->len;
2723 ret = dev_queue_xmit(skb);
2724 count_tx(dev, ret, len);
2725 return ret;
2726 }
2727
2728 if (!secy->operational) {
2729 kfree_skb(skb);
2730 dev->stats.tx_dropped++;
2731 return NETDEV_TX_OK;
2732 }
2733
2734 skb = macsec_encrypt(skb, dev);
2735 if (IS_ERR(skb)) {
2736 if (PTR_ERR(skb) != -EINPROGRESS)
2737 dev->stats.tx_dropped++;
2738 return NETDEV_TX_OK;
2739 }
2740
2741 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2742
2743 macsec_encrypt_finish(skb, dev);
2744 len = skb->len;
2745 ret = dev_queue_xmit(skb);
2746 count_tx(dev, ret, len);
2747 return ret;
2748 }
2749
2750 #define MACSEC_FEATURES \
2751 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2752
macsec_dev_init(struct net_device * dev)2753 static int macsec_dev_init(struct net_device *dev)
2754 {
2755 struct macsec_dev *macsec = macsec_priv(dev);
2756 struct net_device *real_dev = macsec->real_dev;
2757 int err;
2758
2759 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2760 if (!dev->tstats)
2761 return -ENOMEM;
2762
2763 err = gro_cells_init(&macsec->gro_cells, dev);
2764 if (err) {
2765 free_percpu(dev->tstats);
2766 return err;
2767 }
2768
2769 dev->features = real_dev->features & MACSEC_FEATURES;
2770 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2771
2772 dev->needed_headroom = real_dev->needed_headroom +
2773 MACSEC_NEEDED_HEADROOM;
2774 dev->needed_tailroom = real_dev->needed_tailroom +
2775 MACSEC_NEEDED_TAILROOM;
2776
2777 if (is_zero_ether_addr(dev->dev_addr))
2778 eth_hw_addr_inherit(dev, real_dev);
2779 if (is_zero_ether_addr(dev->broadcast))
2780 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2781
2782 return 0;
2783 }
2784
macsec_dev_uninit(struct net_device * dev)2785 static void macsec_dev_uninit(struct net_device *dev)
2786 {
2787 struct macsec_dev *macsec = macsec_priv(dev);
2788
2789 gro_cells_destroy(&macsec->gro_cells);
2790 free_percpu(dev->tstats);
2791 }
2792
macsec_fix_features(struct net_device * dev,netdev_features_t features)2793 static netdev_features_t macsec_fix_features(struct net_device *dev,
2794 netdev_features_t features)
2795 {
2796 struct macsec_dev *macsec = macsec_priv(dev);
2797 struct net_device *real_dev = macsec->real_dev;
2798
2799 features &= (real_dev->features & MACSEC_FEATURES) |
2800 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
2801 features |= NETIF_F_LLTX;
2802
2803 return features;
2804 }
2805
macsec_dev_open(struct net_device * dev)2806 static int macsec_dev_open(struct net_device *dev)
2807 {
2808 struct macsec_dev *macsec = macsec_priv(dev);
2809 struct net_device *real_dev = macsec->real_dev;
2810 int err;
2811
2812 err = dev_uc_add(real_dev, dev->dev_addr);
2813 if (err < 0)
2814 return err;
2815
2816 if (dev->flags & IFF_ALLMULTI) {
2817 err = dev_set_allmulti(real_dev, 1);
2818 if (err < 0)
2819 goto del_unicast;
2820 }
2821
2822 if (dev->flags & IFF_PROMISC) {
2823 err = dev_set_promiscuity(real_dev, 1);
2824 if (err < 0)
2825 goto clear_allmulti;
2826 }
2827
2828 if (netif_carrier_ok(real_dev))
2829 netif_carrier_on(dev);
2830
2831 return 0;
2832 clear_allmulti:
2833 if (dev->flags & IFF_ALLMULTI)
2834 dev_set_allmulti(real_dev, -1);
2835 del_unicast:
2836 dev_uc_del(real_dev, dev->dev_addr);
2837 netif_carrier_off(dev);
2838 return err;
2839 }
2840
macsec_dev_stop(struct net_device * dev)2841 static int macsec_dev_stop(struct net_device *dev)
2842 {
2843 struct macsec_dev *macsec = macsec_priv(dev);
2844 struct net_device *real_dev = macsec->real_dev;
2845
2846 netif_carrier_off(dev);
2847
2848 dev_mc_unsync(real_dev, dev);
2849 dev_uc_unsync(real_dev, dev);
2850
2851 if (dev->flags & IFF_ALLMULTI)
2852 dev_set_allmulti(real_dev, -1);
2853
2854 if (dev->flags & IFF_PROMISC)
2855 dev_set_promiscuity(real_dev, -1);
2856
2857 dev_uc_del(real_dev, dev->dev_addr);
2858
2859 return 0;
2860 }
2861
macsec_dev_change_rx_flags(struct net_device * dev,int change)2862 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2863 {
2864 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2865
2866 if (!(dev->flags & IFF_UP))
2867 return;
2868
2869 if (change & IFF_ALLMULTI)
2870 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2871
2872 if (change & IFF_PROMISC)
2873 dev_set_promiscuity(real_dev,
2874 dev->flags & IFF_PROMISC ? 1 : -1);
2875 }
2876
macsec_dev_set_rx_mode(struct net_device * dev)2877 static void macsec_dev_set_rx_mode(struct net_device *dev)
2878 {
2879 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2880
2881 dev_mc_sync(real_dev, dev);
2882 dev_uc_sync(real_dev, dev);
2883 }
2884
macsec_set_mac_address(struct net_device * dev,void * p)2885 static int macsec_set_mac_address(struct net_device *dev, void *p)
2886 {
2887 struct macsec_dev *macsec = macsec_priv(dev);
2888 struct net_device *real_dev = macsec->real_dev;
2889 struct sockaddr *addr = p;
2890 int err;
2891
2892 if (!is_valid_ether_addr(addr->sa_data))
2893 return -EADDRNOTAVAIL;
2894
2895 if (!(dev->flags & IFF_UP))
2896 goto out;
2897
2898 err = dev_uc_add(real_dev, addr->sa_data);
2899 if (err < 0)
2900 return err;
2901
2902 dev_uc_del(real_dev, dev->dev_addr);
2903
2904 out:
2905 ether_addr_copy(dev->dev_addr, addr->sa_data);
2906 return 0;
2907 }
2908
macsec_change_mtu(struct net_device * dev,int new_mtu)2909 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2910 {
2911 struct macsec_dev *macsec = macsec_priv(dev);
2912 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2913
2914 if (macsec->real_dev->mtu - extra < new_mtu)
2915 return -ERANGE;
2916
2917 dev->mtu = new_mtu;
2918
2919 return 0;
2920 }
2921
macsec_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * s)2922 static void macsec_get_stats64(struct net_device *dev,
2923 struct rtnl_link_stats64 *s)
2924 {
2925 int cpu;
2926
2927 if (!dev->tstats)
2928 return;
2929
2930 for_each_possible_cpu(cpu) {
2931 struct pcpu_sw_netstats *stats;
2932 struct pcpu_sw_netstats tmp;
2933 int start;
2934
2935 stats = per_cpu_ptr(dev->tstats, cpu);
2936 do {
2937 start = u64_stats_fetch_begin_irq(&stats->syncp);
2938 tmp.rx_packets = stats->rx_packets;
2939 tmp.rx_bytes = stats->rx_bytes;
2940 tmp.tx_packets = stats->tx_packets;
2941 tmp.tx_bytes = stats->tx_bytes;
2942 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2943
2944 s->rx_packets += tmp.rx_packets;
2945 s->rx_bytes += tmp.rx_bytes;
2946 s->tx_packets += tmp.tx_packets;
2947 s->tx_bytes += tmp.tx_bytes;
2948 }
2949
2950 s->rx_dropped = dev->stats.rx_dropped;
2951 s->tx_dropped = dev->stats.tx_dropped;
2952 }
2953
macsec_get_iflink(const struct net_device * dev)2954 static int macsec_get_iflink(const struct net_device *dev)
2955 {
2956 return macsec_priv(dev)->real_dev->ifindex;
2957 }
2958
2959 static const struct net_device_ops macsec_netdev_ops = {
2960 .ndo_init = macsec_dev_init,
2961 .ndo_uninit = macsec_dev_uninit,
2962 .ndo_open = macsec_dev_open,
2963 .ndo_stop = macsec_dev_stop,
2964 .ndo_fix_features = macsec_fix_features,
2965 .ndo_change_mtu = macsec_change_mtu,
2966 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2967 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2968 .ndo_set_mac_address = macsec_set_mac_address,
2969 .ndo_start_xmit = macsec_start_xmit,
2970 .ndo_get_stats64 = macsec_get_stats64,
2971 .ndo_get_iflink = macsec_get_iflink,
2972 };
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
macsec_free_netdev(struct net_device * dev)2993 static void macsec_free_netdev(struct net_device *dev)
2994 {
2995 struct macsec_dev *macsec = macsec_priv(dev);
2996
2997 free_percpu(macsec->stats);
2998 free_percpu(macsec->secy.tx_sc.stats);
2999
3000 }
3001
macsec_setup(struct net_device * dev)3002 static void macsec_setup(struct net_device *dev)
3003 {
3004 ether_setup(dev);
3005 dev->min_mtu = 0;
3006 dev->max_mtu = ETH_MAX_MTU;
3007 dev->priv_flags |= IFF_NO_QUEUE;
3008 dev->netdev_ops = &macsec_netdev_ops;
3009 dev->needs_free_netdev = true;
3010 dev->priv_destructor = macsec_free_netdev;
3011 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3012
3013 eth_zero_addr(dev->broadcast);
3014 }
3015
macsec_changelink_common(struct net_device * dev,struct nlattr * data[])3016 static int macsec_changelink_common(struct net_device *dev,
3017 struct nlattr *data[])
3018 {
3019 struct macsec_secy *secy;
3020 struct macsec_tx_sc *tx_sc;
3021
3022 secy = &macsec_priv(dev)->secy;
3023 tx_sc = &secy->tx_sc;
3024
3025 if (data[IFLA_MACSEC_ENCODING_SA]) {
3026 struct macsec_tx_sa *tx_sa;
3027
3028 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3029 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3030
3031 secy->operational = tx_sa && tx_sa->active;
3032 }
3033
3034 if (data[IFLA_MACSEC_WINDOW])
3035 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3036
3037 if (data[IFLA_MACSEC_ENCRYPT])
3038 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3039
3040 if (data[IFLA_MACSEC_PROTECT])
3041 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3042
3043 if (data[IFLA_MACSEC_INC_SCI])
3044 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3045
3046 if (data[IFLA_MACSEC_ES])
3047 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3048
3049 if (data[IFLA_MACSEC_SCB])
3050 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3051
3052 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3053 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3054
3055 if (data[IFLA_MACSEC_VALIDATION])
3056 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3057
3058 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3059 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3060 case MACSEC_CIPHER_ID_GCM_AES_128:
3061 case MACSEC_DEFAULT_CIPHER_ID:
3062 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3063 break;
3064 case MACSEC_CIPHER_ID_GCM_AES_256:
3065 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3066 break;
3067 default:
3068 return -EINVAL;
3069 }
3070 }
3071
3072 return 0;
3073 }
3074
macsec_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)3075 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3076 struct nlattr *data[],
3077 struct netlink_ext_ack *extack)
3078 {
3079 if (!data)
3080 return 0;
3081
3082 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3083 data[IFLA_MACSEC_ICV_LEN] ||
3084 data[IFLA_MACSEC_SCI] ||
3085 data[IFLA_MACSEC_PORT])
3086 return -EINVAL;
3087
3088 return macsec_changelink_common(dev, data);
3089 }
3090
macsec_del_dev(struct macsec_dev * macsec)3091 static void macsec_del_dev(struct macsec_dev *macsec)
3092 {
3093 int i;
3094
3095 while (macsec->secy.rx_sc) {
3096 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3097
3098 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3099 free_rx_sc(rx_sc);
3100 }
3101
3102 for (i = 0; i < MACSEC_NUM_AN; i++) {
3103 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3104
3105 if (sa) {
3106 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3107 clear_tx_sa(sa);
3108 }
3109 }
3110 }
3111
macsec_common_dellink(struct net_device * dev,struct list_head * head)3112 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3113 {
3114 struct macsec_dev *macsec = macsec_priv(dev);
3115 struct net_device *real_dev = macsec->real_dev;
3116
3117 unregister_netdevice_queue(dev, head);
3118 list_del_rcu(&macsec->secys);
3119 macsec_del_dev(macsec);
3120 netdev_upper_dev_unlink(real_dev, dev);
3121
3122 macsec_generation++;
3123 }
3124
macsec_dellink(struct net_device * dev,struct list_head * head)3125 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3126 {
3127 struct macsec_dev *macsec = macsec_priv(dev);
3128 struct net_device *real_dev = macsec->real_dev;
3129 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3130
3131 macsec_common_dellink(dev, head);
3132
3133 if (list_empty(&rxd->secys)) {
3134 netdev_rx_handler_unregister(real_dev);
3135 kfree(rxd);
3136 }
3137 }
3138
register_macsec_dev(struct net_device * real_dev,struct net_device * dev)3139 static int register_macsec_dev(struct net_device *real_dev,
3140 struct net_device *dev)
3141 {
3142 struct macsec_dev *macsec = macsec_priv(dev);
3143 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3144
3145 if (!rxd) {
3146 int err;
3147
3148 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3149 if (!rxd)
3150 return -ENOMEM;
3151
3152 INIT_LIST_HEAD(&rxd->secys);
3153
3154 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3155 rxd);
3156 if (err < 0) {
3157 kfree(rxd);
3158 return err;
3159 }
3160 }
3161
3162 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3163 return 0;
3164 }
3165
sci_exists(struct net_device * dev,sci_t sci)3166 static bool sci_exists(struct net_device *dev, sci_t sci)
3167 {
3168 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3169 struct macsec_dev *macsec;
3170
3171 list_for_each_entry(macsec, &rxd->secys, secys) {
3172 if (macsec->secy.sci == sci)
3173 return true;
3174 }
3175
3176 return false;
3177 }
3178
dev_to_sci(struct net_device * dev,__be16 port)3179 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3180 {
3181 return make_sci(dev->dev_addr, port);
3182 }
3183
macsec_add_dev(struct net_device * dev,sci_t sci,u8 icv_len)3184 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3185 {
3186 struct macsec_dev *macsec = macsec_priv(dev);
3187 struct macsec_secy *secy = &macsec->secy;
3188
3189 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3190 if (!macsec->stats)
3191 return -ENOMEM;
3192
3193 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3194 if (!secy->tx_sc.stats) {
3195 free_percpu(macsec->stats);
3196 return -ENOMEM;
3197 }
3198
3199 if (sci == MACSEC_UNDEF_SCI)
3200 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3201
3202 secy->netdev = dev;
3203 secy->operational = true;
3204 secy->key_len = DEFAULT_SAK_LEN;
3205 secy->icv_len = icv_len;
3206 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3207 secy->protect_frames = true;
3208 secy->replay_protect = false;
3209
3210 secy->sci = sci;
3211 secy->tx_sc.active = true;
3212 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3213 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3214 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3215 secy->tx_sc.end_station = false;
3216 secy->tx_sc.scb = false;
3217
3218 return 0;
3219 }
3220
macsec_newlink(struct net * net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)3221 static int macsec_newlink(struct net *net, struct net_device *dev,
3222 struct nlattr *tb[], struct nlattr *data[],
3223 struct netlink_ext_ack *extack)
3224 {
3225 struct macsec_dev *macsec = macsec_priv(dev);
3226 struct net_device *real_dev;
3227 int err;
3228 sci_t sci;
3229 u8 icv_len = DEFAULT_ICV_LEN;
3230 rx_handler_func_t *rx_handler;
3231
3232 if (!tb[IFLA_LINK])
3233 return -EINVAL;
3234 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3235 if (!real_dev)
3236 return -ENODEV;
3237
3238 dev->priv_flags |= IFF_MACSEC;
3239
3240 macsec->real_dev = real_dev;
3241
3242 if (data && data[IFLA_MACSEC_ICV_LEN])
3243 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3244 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3245
3246 rx_handler = rtnl_dereference(real_dev->rx_handler);
3247 if (rx_handler && rx_handler != macsec_handle_frame)
3248 return -EBUSY;
3249
3250 err = register_netdevice(dev);
3251 if (err < 0)
3252 return err;
3253
3254 err = netdev_upper_dev_link(real_dev, dev, extack);
3255 if (err < 0)
3256 goto unregister;
3257
3258 /* need to be already registered so that ->init has run and
3259 * the MAC addr is set
3260 */
3261 if (data && data[IFLA_MACSEC_SCI])
3262 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3263 else if (data && data[IFLA_MACSEC_PORT])
3264 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3265 else
3266 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3267
3268 if (rx_handler && sci_exists(real_dev, sci)) {
3269 err = -EBUSY;
3270 goto unlink;
3271 }
3272
3273 err = macsec_add_dev(dev, sci, icv_len);
3274 if (err)
3275 goto unlink;
3276
3277 if (data) {
3278 err = macsec_changelink_common(dev, data);
3279 if (err)
3280 goto del_dev;
3281 }
3282
3283 err = register_macsec_dev(real_dev, dev);
3284 if (err < 0)
3285 goto del_dev;
3286
3287 netif_stacked_transfer_operstate(real_dev, dev);
3288 linkwatch_fire_event(dev);
3289
3290 macsec_generation++;
3291
3292 return 0;
3293
3294 del_dev:
3295 macsec_del_dev(macsec);
3296 unlink:
3297 netdev_upper_dev_unlink(real_dev, dev);
3298 unregister:
3299 unregister_netdevice(dev);
3300 return err;
3301 }
3302
macsec_validate_attr(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)3303 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
3304 struct netlink_ext_ack *extack)
3305 {
3306 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3307 u8 icv_len = DEFAULT_ICV_LEN;
3308 int flag;
3309 bool es, scb, sci;
3310
3311 if (!data)
3312 return 0;
3313
3314 if (data[IFLA_MACSEC_CIPHER_SUITE])
3315 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3316
3317 if (data[IFLA_MACSEC_ICV_LEN]) {
3318 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3319 if (icv_len != DEFAULT_ICV_LEN) {
3320 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
3321 struct crypto_aead *dummy_tfm;
3322
3323 dummy_tfm = macsec_alloc_tfm(dummy_key,
3324 DEFAULT_SAK_LEN,
3325 icv_len);
3326 if (IS_ERR(dummy_tfm))
3327 return PTR_ERR(dummy_tfm);
3328 crypto_free_aead(dummy_tfm);
3329 }
3330 }
3331
3332 switch (csid) {
3333 case MACSEC_CIPHER_ID_GCM_AES_128:
3334 case MACSEC_CIPHER_ID_GCM_AES_256:
3335 case MACSEC_DEFAULT_CIPHER_ID:
3336 if (icv_len < MACSEC_MIN_ICV_LEN ||
3337 icv_len > MACSEC_STD_ICV_LEN)
3338 return -EINVAL;
3339 break;
3340 default:
3341 return -EINVAL;
3342 }
3343
3344 if (data[IFLA_MACSEC_ENCODING_SA]) {
3345 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3346 return -EINVAL;
3347 }
3348
3349 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3350 flag < IFLA_MACSEC_VALIDATION;
3351 flag++) {
3352 if (data[flag]) {
3353 if (nla_get_u8(data[flag]) > 1)
3354 return -EINVAL;
3355 }
3356 }
3357
3358 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3359 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3360 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3361
3362 if ((sci && (scb || es)) || (scb && es))
3363 return -EINVAL;
3364
3365 if (data[IFLA_MACSEC_VALIDATION] &&
3366 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3367 return -EINVAL;
3368
3369 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3370 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3371 !data[IFLA_MACSEC_WINDOW])
3372 return -EINVAL;
3373
3374 return 0;
3375 }
3376
macsec_get_link_net(const struct net_device * dev)3377 static struct net *macsec_get_link_net(const struct net_device *dev)
3378 {
3379 return dev_net(macsec_priv(dev)->real_dev);
3380 }
3381
macsec_get_size(const struct net_device * dev)3382 static size_t macsec_get_size(const struct net_device *dev)
3383 {
3384 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
3385 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
3386 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
3387 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
3388 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
3389 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
3390 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
3391 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
3392 nla_total_size(1) + /* IFLA_MACSEC_ES */
3393 nla_total_size(1) + /* IFLA_MACSEC_SCB */
3394 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
3395 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
3396 0;
3397 }
3398
macsec_fill_info(struct sk_buff * skb,const struct net_device * dev)3399 static int macsec_fill_info(struct sk_buff *skb,
3400 const struct net_device *dev)
3401 {
3402 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3403 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3404 u64 csid;
3405
3406 switch (secy->key_len) {
3407 case MACSEC_GCM_AES_128_SAK_LEN:
3408 csid = MACSEC_DEFAULT_CIPHER_ID;
3409 break;
3410 case MACSEC_GCM_AES_256_SAK_LEN:
3411 csid = MACSEC_CIPHER_ID_GCM_AES_256;
3412 break;
3413 default:
3414 goto nla_put_failure;
3415 }
3416
3417 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
3418 IFLA_MACSEC_PAD) ||
3419 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3420 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
3421 csid, IFLA_MACSEC_PAD) ||
3422 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3423 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3424 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3425 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3426 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3427 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3428 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3429 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3430 0)
3431 goto nla_put_failure;
3432
3433 if (secy->replay_protect) {
3434 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3435 goto nla_put_failure;
3436 }
3437
3438 return 0;
3439
3440 nla_put_failure:
3441 return -EMSGSIZE;
3442 }
3443
3444 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3445 .kind = "macsec",
3446 .priv_size = sizeof(struct macsec_dev),
3447 .maxtype = IFLA_MACSEC_MAX,
3448 .policy = macsec_rtnl_policy,
3449 .setup = macsec_setup,
3450 .validate = macsec_validate_attr,
3451 .newlink = macsec_newlink,
3452 .changelink = macsec_changelink,
3453 .dellink = macsec_dellink,
3454 .get_size = macsec_get_size,
3455 .fill_info = macsec_fill_info,
3456 .get_link_net = macsec_get_link_net,
3457 };
3458
is_macsec_master(struct net_device * dev)3459 static bool is_macsec_master(struct net_device *dev)
3460 {
3461 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3462 }
3463
macsec_notify(struct notifier_block * this,unsigned long event,void * ptr)3464 static int macsec_notify(struct notifier_block *this, unsigned long event,
3465 void *ptr)
3466 {
3467 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3468 LIST_HEAD(head);
3469
3470 if (!is_macsec_master(real_dev))
3471 return NOTIFY_DONE;
3472
3473 switch (event) {
3474 case NETDEV_DOWN:
3475 case NETDEV_UP:
3476 case NETDEV_CHANGE: {
3477 struct macsec_dev *m, *n;
3478 struct macsec_rxh_data *rxd;
3479
3480 rxd = macsec_data_rtnl(real_dev);
3481 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3482 struct net_device *dev = m->secy.netdev;
3483
3484 netif_stacked_transfer_operstate(real_dev, dev);
3485 }
3486 break;
3487 }
3488 case NETDEV_UNREGISTER: {
3489 struct macsec_dev *m, *n;
3490 struct macsec_rxh_data *rxd;
3491
3492 rxd = macsec_data_rtnl(real_dev);
3493 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3494 macsec_common_dellink(m->secy.netdev, &head);
3495 }
3496
3497 netdev_rx_handler_unregister(real_dev);
3498 kfree(rxd);
3499
3500 unregister_netdevice_many(&head);
3501 break;
3502 }
3503 case NETDEV_CHANGEMTU: {
3504 struct macsec_dev *m;
3505 struct macsec_rxh_data *rxd;
3506
3507 rxd = macsec_data_rtnl(real_dev);
3508 list_for_each_entry(m, &rxd->secys, secys) {
3509 struct net_device *dev = m->secy.netdev;
3510 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3511 macsec_extra_len(true));
3512
3513 if (dev->mtu > mtu)
3514 dev_set_mtu(dev, mtu);
3515 }
3516 }
3517 }
3518
3519 return NOTIFY_OK;
3520 }
3521
3522 static struct notifier_block macsec_notifier = {
3523 .notifier_call = macsec_notify,
3524 };
3525
macsec_init(void)3526 static int __init macsec_init(void)
3527 {
3528 int err;
3529
3530 pr_info("MACsec IEEE 802.1AE\n");
3531 err = register_netdevice_notifier(&macsec_notifier);
3532 if (err)
3533 return err;
3534
3535 err = rtnl_link_register(&macsec_link_ops);
3536 if (err)
3537 goto notifier;
3538
3539 err = genl_register_family(&macsec_fam);
3540 if (err)
3541 goto rtnl;
3542
3543 return 0;
3544
3545 rtnl:
3546 rtnl_link_unregister(&macsec_link_ops);
3547 notifier:
3548 unregister_netdevice_notifier(&macsec_notifier);
3549 return err;
3550 }
3551
macsec_exit(void)3552 static void __exit macsec_exit(void)
3553 {
3554 genl_unregister_family(&macsec_fam);
3555 rtnl_link_unregister(&macsec_link_ops);
3556 unregister_netdevice_notifier(&macsec_notifier);
3557 rcu_barrier();
3558 }
3559
3560 module_init(macsec_init);
3561 module_exit(macsec_exit);
3562
3563 MODULE_ALIAS_RTNL_LINK("macsec");
3564 MODULE_ALIAS_GENL_FAMILY("macsec");
3565
3566 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3567 MODULE_LICENSE("GPL v2");
3568
