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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / macsec.c
blob45bfd99f17fa9f6adae6a2e25fc821b23c8c8df4
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/netdevice.h>
15 #include <linux/rtnetlink.h>
16 #include <linux/refcount.h>
17 #include <net/genetlink.h>
18 #include <net/sock.h>
19 #include <net/gro_cells.h>
20 #include <net/macsec.h>
21 #include <linux/phy.h>
22
23 #include <uapi/linux/if_macsec.h>
24
25 #define MACSEC_SCI_LEN 8
26
27 /* SecTAG length = macsec_eth_header without the optional SCI */
28 #define MACSEC_TAG_LEN 6
29
30 struct macsec_eth_header {
31 struct ethhdr eth;
32 /* SecTAG */
33 u8 tci_an;
34 #if defined(__LITTLE_ENDIAN_BITFIELD)
35 u8 short_length:6,
36 unused:2;
37 #elif defined(__BIG_ENDIAN_BITFIELD)
38 u8 unused:2,
39 short_length:6;
40 #else
41 #error "Please fix <asm/byteorder.h>"
42 #endif
43 __be32 packet_number;
44 u8 secure_channel_id[8]; /* optional */
45 } __packed;
46
47 #define MACSEC_TCI_VERSION 0x80
48 #define MACSEC_TCI_ES 0x40 /* end station */
49 #define MACSEC_TCI_SC 0x20 /* SCI present */
50 #define MACSEC_TCI_SCB 0x10 /* epon */
51 #define MACSEC_TCI_E 0x08 /* encryption */
52 #define MACSEC_TCI_C 0x04 /* changed text */
53 #define MACSEC_AN_MASK 0x03 /* association number */
54 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
55
56 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
57 #define MIN_NON_SHORT_LEN 48
58
59 #define GCM_AES_IV_LEN 12
60 #define DEFAULT_ICV_LEN 16
61
62 #define for_each_rxsc(secy, sc) \
63 for (sc = rcu_dereference_bh(secy->rx_sc); \
64 sc; \
65 sc = rcu_dereference_bh(sc->next))
66 #define for_each_rxsc_rtnl(secy, sc) \
67 for (sc = rtnl_dereference(secy->rx_sc); \
68 sc; \
69 sc = rtnl_dereference(sc->next))
70
71 struct gcm_iv {
72 union {
73 u8 secure_channel_id[8];
74 sci_t sci;
75 };
76 __be32 pn;
77 };
78
79 struct macsec_dev_stats {
80 __u64 OutPktsUntagged;
81 __u64 InPktsUntagged;
82 __u64 OutPktsTooLong;
83 __u64 InPktsNoTag;
84 __u64 InPktsBadTag;
85 __u64 InPktsUnknownSCI;
86 __u64 InPktsNoSCI;
87 __u64 InPktsOverrun;
88 };
89
90 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
91
92 struct pcpu_secy_stats {
93 struct macsec_dev_stats stats;
94 struct u64_stats_sync syncp;
95 };
96
97 /**
98 * struct macsec_dev - private data
99 * @secy: SecY config
100 * @real_dev: pointer to underlying netdevice
101 * @stats: MACsec device stats
102 * @secys: linked list of SecY's on the underlying device
103 * @offload: status of offloading on the MACsec device
104 */
105 struct macsec_dev {
106 struct macsec_secy secy;
107 struct net_device *real_dev;
108 struct pcpu_secy_stats __percpu *stats;
109 struct list_head secys;
110 struct gro_cells gro_cells;
111 enum macsec_offload offload;
112 };
113
114 /**
115 * struct macsec_rxh_data - rx_handler private argument
116 * @secys: linked list of SecY's on this underlying device
117 */
118 struct macsec_rxh_data {
119 struct list_head secys;
120 };
121
122 static struct macsec_dev *macsec_priv(const struct net_device *dev)
123 {
124 return (struct macsec_dev *)netdev_priv(dev);
125 }
126
127 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
128 {
129 return rcu_dereference_bh(dev->rx_handler_data);
130 }
131
132 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
133 {
134 return rtnl_dereference(dev->rx_handler_data);
135 }
136
137 struct macsec_cb {
138 struct aead_request *req;
139 union {
140 struct macsec_tx_sa *tx_sa;
141 struct macsec_rx_sa *rx_sa;
142 };
143 u8 assoc_num;
144 bool valid;
145 bool has_sci;
146 };
147
148 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
149 {
150 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
151
152 if (!sa || !sa->active)
153 return NULL;
154
155 if (!refcount_inc_not_zero(&sa->refcnt))
156 return NULL;
157
158 return sa;
159 }
160
161 static void free_rx_sc_rcu(struct rcu_head *head)
162 {
163 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
164
165 free_percpu(rx_sc->stats);
166 kfree(rx_sc);
167 }
168
169 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
170 {
171 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
172 }
173
174 static void macsec_rxsc_put(struct macsec_rx_sc *sc)
175 {
176 if (refcount_dec_and_test(&sc->refcnt))
177 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
178 }
179
180 static void free_rxsa(struct rcu_head *head)
181 {
182 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
183
184 crypto_free_aead(sa->key.tfm);
185 free_percpu(sa->stats);
186 kfree(sa);
187 }
188
189 static void macsec_rxsa_put(struct macsec_rx_sa *sa)
190 {
191 if (refcount_dec_and_test(&sa->refcnt))
192 call_rcu(&sa->rcu, free_rxsa);
193 }
194
195 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
196 {
197 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
198
199 if (!sa || !sa->active)
200 return NULL;
201
202 if (!refcount_inc_not_zero(&sa->refcnt))
203 return NULL;
204
205 return sa;
206 }
207
208 static void free_txsa(struct rcu_head *head)
209 {
210 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
211
212 crypto_free_aead(sa->key.tfm);
213 free_percpu(sa->stats);
214 kfree(sa);
215 }
216
217 static void macsec_txsa_put(struct macsec_tx_sa *sa)
218 {
219 if (refcount_dec_and_test(&sa->refcnt))
220 call_rcu(&sa->rcu, free_txsa);
221 }
222
223 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
224 {
225 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
226 return (struct macsec_cb *)skb->cb;
227 }
228
229 #define MACSEC_PORT_ES (htons(0x0001))
230 #define MACSEC_PORT_SCB (0x0000)
231 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
232
233 #define MACSEC_GCM_AES_128_SAK_LEN 16
234 #define MACSEC_GCM_AES_256_SAK_LEN 32
235
236 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
237 #define DEFAULT_SEND_SCI true
238 #define DEFAULT_ENCRYPT false
239 #define DEFAULT_ENCODING_SA 0
240
241 static bool send_sci(const struct macsec_secy *secy)
242 {
243 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
244
245 return tx_sc->send_sci ||
246 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
247 }
248
249 static sci_t make_sci(u8 *addr, __be16 port)
250 {
251 sci_t sci;
252
253 memcpy(&sci, addr, ETH_ALEN);
254 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
255
256 return sci;
257 }
258
259 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
260 {
261 sci_t sci;
262
263 if (sci_present)
264 memcpy(&sci, hdr->secure_channel_id,
265 sizeof(hdr->secure_channel_id));
266 else
267 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
268
269 return sci;
270 }
271
272 static unsigned int macsec_sectag_len(bool sci_present)
273 {
274 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
275 }
276
277 static unsigned int macsec_hdr_len(bool sci_present)
278 {
279 return macsec_sectag_len(sci_present) + ETH_HLEN;
280 }
281
282 static unsigned int macsec_extra_len(bool sci_present)
283 {
284 return macsec_sectag_len(sci_present) + sizeof(__be16);
285 }
286
287 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
288 static void macsec_fill_sectag(struct macsec_eth_header *h,
289 const struct macsec_secy *secy, u32 pn,
290 bool sci_present)
291 {
292 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
293
294 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
295 h->eth.h_proto = htons(ETH_P_MACSEC);
296
297 if (sci_present) {
298 h->tci_an |= MACSEC_TCI_SC;
299 memcpy(&h->secure_channel_id, &secy->sci,
300 sizeof(h->secure_channel_id));
301 } else {
302 if (tx_sc->end_station)
303 h->tci_an |= MACSEC_TCI_ES;
304 if (tx_sc->scb)
305 h->tci_an |= MACSEC_TCI_SCB;
306 }
307
308 h->packet_number = htonl(pn);
309
310 /* with GCM, C/E clear for !encrypt, both set for encrypt */
311 if (tx_sc->encrypt)
312 h->tci_an |= MACSEC_TCI_CONFID;
313 else if (secy->icv_len != DEFAULT_ICV_LEN)
314 h->tci_an |= MACSEC_TCI_C;
315
316 h->tci_an |= tx_sc->encoding_sa;
317 }
318
319 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
320 {
321 if (data_len < MIN_NON_SHORT_LEN)
322 h->short_length = data_len;
323 }
324
325 /* Checks if a MACsec interface is being offloaded to an hardware engine */
326 static bool macsec_is_offloaded(struct macsec_dev *macsec)
327 {
328 if (macsec->offload == MACSEC_OFFLOAD_PHY)
329 return true;
330
331 return false;
332 }
333
334 /* Checks if underlying layers implement MACsec offloading functions. */
335 static bool macsec_check_offload(enum macsec_offload offload,
336 struct macsec_dev *macsec)
337 {
338 if (!macsec || !macsec->real_dev)
339 return false;
340
341 if (offload == MACSEC_OFFLOAD_PHY)
342 return macsec->real_dev->phydev &&
343 macsec->real_dev->phydev->macsec_ops;
344
345 return false;
346 }
347
348 static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload,
349 struct macsec_dev *macsec,
350 struct macsec_context *ctx)
351 {
352 if (ctx) {
353 memset(ctx, 0, sizeof(*ctx));
354 ctx->offload = offload;
355
356 if (offload == MACSEC_OFFLOAD_PHY)
357 ctx->phydev = macsec->real_dev->phydev;
358 }
359
360 return macsec->real_dev->phydev->macsec_ops;
361 }
362
363 /* Returns a pointer to the MACsec ops struct if any and updates the MACsec
364 * context device reference if provided.
365 */
366 static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
367 struct macsec_context *ctx)
368 {
369 if (!macsec_check_offload(macsec->offload, macsec))
370 return NULL;
371
372 return __macsec_get_ops(macsec->offload, macsec, ctx);
373 }
374
375 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
376 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
377 {
378 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
379 int len = skb->len - 2 * ETH_ALEN;
380 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
381
382 /* a) It comprises at least 17 octets */
383 if (skb->len <= 16)
384 return false;
385
386 /* b) MACsec EtherType: already checked */
387
388 /* c) V bit is clear */
389 if (h->tci_an & MACSEC_TCI_VERSION)
390 return false;
391
392 /* d) ES or SCB => !SC */
393 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
394 (h->tci_an & MACSEC_TCI_SC))
395 return false;
396
397 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
398 if (h->unused)
399 return false;
400
401 /* rx.pn != 0 (figure 10-5) */
402 if (!h->packet_number)
403 return false;
404
405 /* length check, f) g) h) i) */
406 if (h->short_length)
407 return len == extra_len + h->short_length;
408 return len >= extra_len + MIN_NON_SHORT_LEN;
409 }
410
411 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
412 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
413
414 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
415 {
416 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
417
418 gcm_iv->sci = sci;
419 gcm_iv->pn = htonl(pn);
420 }
421
422 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
423 {
424 return (struct macsec_eth_header *)skb_mac_header(skb);
425 }
426
427 static void __macsec_pn_wrapped(struct macsec_secy *secy,
428 struct macsec_tx_sa *tx_sa)
429 {
430 pr_debug("PN wrapped, transitioning to !oper\n");
431 tx_sa->active = false;
432 if (secy->protect_frames)
433 secy->operational = false;
434 }
435
436 void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
437 {
438 spin_lock_bh(&tx_sa->lock);
439 __macsec_pn_wrapped(secy, tx_sa);
440 spin_unlock_bh(&tx_sa->lock);
441 }
442 EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
443
444 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
445 {
446 u32 pn;
447
448 spin_lock_bh(&tx_sa->lock);
449 pn = tx_sa->next_pn;
450
451 tx_sa->next_pn++;
452 if (tx_sa->next_pn == 0)
453 __macsec_pn_wrapped(secy, tx_sa);
454 spin_unlock_bh(&tx_sa->lock);
455
456 return pn;
457 }
458
459 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
460 {
461 struct macsec_dev *macsec = netdev_priv(dev);
462
463 skb->dev = macsec->real_dev;
464 skb_reset_mac_header(skb);
465 skb->protocol = eth_hdr(skb)->h_proto;
466 }
467
468 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
469 struct macsec_tx_sa *tx_sa)
470 {
471 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
472
473 u64_stats_update_begin(&txsc_stats->syncp);
474 if (tx_sc->encrypt) {
475 txsc_stats->stats.OutOctetsEncrypted += skb->len;
476 txsc_stats->stats.OutPktsEncrypted++;
477 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
478 } else {
479 txsc_stats->stats.OutOctetsProtected += skb->len;
480 txsc_stats->stats.OutPktsProtected++;
481 this_cpu_inc(tx_sa->stats->OutPktsProtected);
482 }
483 u64_stats_update_end(&txsc_stats->syncp);
484 }
485
486 static void count_tx(struct net_device *dev, int ret, int len)
487 {
488 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
489 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
490
491 u64_stats_update_begin(&stats->syncp);
492 stats->tx_packets++;
493 stats->tx_bytes += len;
494 u64_stats_update_end(&stats->syncp);
495 }
496 }
497
498 static void macsec_encrypt_done(struct crypto_async_request *base, int err)
499 {
500 struct sk_buff *skb = base->data;
501 struct net_device *dev = skb->dev;
502 struct macsec_dev *macsec = macsec_priv(dev);
503 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
504 int len, ret;
505
506 aead_request_free(macsec_skb_cb(skb)->req);
507
508 rcu_read_lock_bh();
509 macsec_encrypt_finish(skb, dev);
510 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
511 len = skb->len;
512 ret = dev_queue_xmit(skb);
513 count_tx(dev, ret, len);
514 rcu_read_unlock_bh();
515
516 macsec_txsa_put(sa);
517 dev_put(dev);
518 }
519
520 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
521 unsigned char **iv,
522 struct scatterlist **sg,
523 int num_frags)
524 {
525 size_t size, iv_offset, sg_offset;
526 struct aead_request *req;
527 void *tmp;
528
529 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
530 iv_offset = size;
531 size += GCM_AES_IV_LEN;
532
533 size = ALIGN(size, __alignof__(struct scatterlist));
534 sg_offset = size;
535 size += sizeof(struct scatterlist) * num_frags;
536
537 tmp = kmalloc(size, GFP_ATOMIC);
538 if (!tmp)
539 return NULL;
540
541 *iv = (unsigned char *)(tmp + iv_offset);
542 *sg = (struct scatterlist *)(tmp + sg_offset);
543 req = tmp;
544
545 aead_request_set_tfm(req, tfm);
546
547 return req;
548 }
549
550 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
551 struct net_device *dev)
552 {
553 int ret;
554 struct scatterlist *sg;
555 struct sk_buff *trailer;
556 unsigned char *iv;
557 struct ethhdr *eth;
558 struct macsec_eth_header *hh;
559 size_t unprotected_len;
560 struct aead_request *req;
561 struct macsec_secy *secy;
562 struct macsec_tx_sc *tx_sc;
563 struct macsec_tx_sa *tx_sa;
564 struct macsec_dev *macsec = macsec_priv(dev);
565 bool sci_present;
566 u32 pn;
567
568 secy = &macsec->secy;
569 tx_sc = &secy->tx_sc;
570
571 /* 10.5.1 TX SA assignment */
572 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
573 if (!tx_sa) {
574 secy->operational = false;
575 kfree_skb(skb);
576 return ERR_PTR(-EINVAL);
577 }
578
579 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
580 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
581 struct sk_buff *nskb = skb_copy_expand(skb,
582 MACSEC_NEEDED_HEADROOM,
583 MACSEC_NEEDED_TAILROOM,
584 GFP_ATOMIC);
585 if (likely(nskb)) {
586 consume_skb(skb);
587 skb = nskb;
588 } else {
589 macsec_txsa_put(tx_sa);
590 kfree_skb(skb);
591 return ERR_PTR(-ENOMEM);
592 }
593 } else {
594 skb = skb_unshare(skb, GFP_ATOMIC);
595 if (!skb) {
596 macsec_txsa_put(tx_sa);
597 return ERR_PTR(-ENOMEM);
598 }
599 }
600
601 unprotected_len = skb->len;
602 eth = eth_hdr(skb);
603 sci_present = send_sci(secy);
604 hh = skb_push(skb, macsec_extra_len(sci_present));
605 memmove(hh, eth, 2 * ETH_ALEN);
606
607 pn = tx_sa_update_pn(tx_sa, secy);
608 if (pn == 0) {
609 macsec_txsa_put(tx_sa);
610 kfree_skb(skb);
611 return ERR_PTR(-ENOLINK);
612 }
613 macsec_fill_sectag(hh, secy, pn, sci_present);
614 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
615
616 skb_put(skb, secy->icv_len);
617
618 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
619 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
620
621 u64_stats_update_begin(&secy_stats->syncp);
622 secy_stats->stats.OutPktsTooLong++;
623 u64_stats_update_end(&secy_stats->syncp);
624
625 macsec_txsa_put(tx_sa);
626 kfree_skb(skb);
627 return ERR_PTR(-EINVAL);
628 }
629
630 ret = skb_cow_data(skb, 0, &trailer);
631 if (unlikely(ret < 0)) {
632 macsec_txsa_put(tx_sa);
633 kfree_skb(skb);
634 return ERR_PTR(ret);
635 }
636
637 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
638 if (!req) {
639 macsec_txsa_put(tx_sa);
640 kfree_skb(skb);
641 return ERR_PTR(-ENOMEM);
642 }
643
644 macsec_fill_iv(iv, secy->sci, pn);
645
646 sg_init_table(sg, ret);
647 ret = skb_to_sgvec(skb, sg, 0, skb->len);
648 if (unlikely(ret < 0)) {
649 aead_request_free(req);
650 macsec_txsa_put(tx_sa);
651 kfree_skb(skb);
652 return ERR_PTR(ret);
653 }
654
655 if (tx_sc->encrypt) {
656 int len = skb->len - macsec_hdr_len(sci_present) -
657 secy->icv_len;
658 aead_request_set_crypt(req, sg, sg, len, iv);
659 aead_request_set_ad(req, macsec_hdr_len(sci_present));
660 } else {
661 aead_request_set_crypt(req, sg, sg, 0, iv);
662 aead_request_set_ad(req, skb->len - secy->icv_len);
663 }
664
665 macsec_skb_cb(skb)->req = req;
666 macsec_skb_cb(skb)->tx_sa = tx_sa;
667 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
668
669 dev_hold(skb->dev);
670 ret = crypto_aead_encrypt(req);
671 if (ret == -EINPROGRESS) {
672 return ERR_PTR(ret);
673 } else if (ret != 0) {
674 dev_put(skb->dev);
675 kfree_skb(skb);
676 aead_request_free(req);
677 macsec_txsa_put(tx_sa);
678 return ERR_PTR(-EINVAL);
679 }
680
681 dev_put(skb->dev);
682 aead_request_free(req);
683 macsec_txsa_put(tx_sa);
684
685 return skb;
686 }
687
688 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
689 {
690 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
691 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
692 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
693 u32 lowest_pn = 0;
694
695 spin_lock(&rx_sa->lock);
696 if (rx_sa->next_pn >= secy->replay_window)
697 lowest_pn = rx_sa->next_pn - secy->replay_window;
698
699 /* Now perform replay protection check again
700 * (see IEEE 802.1AE-2006 figure 10-5)
701 */
702 if (secy->replay_protect && pn < lowest_pn) {
703 spin_unlock(&rx_sa->lock);
704 u64_stats_update_begin(&rxsc_stats->syncp);
705 rxsc_stats->stats.InPktsLate++;
706 u64_stats_update_end(&rxsc_stats->syncp);
707 return false;
708 }
709
710 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
711 u64_stats_update_begin(&rxsc_stats->syncp);
712 if (hdr->tci_an & MACSEC_TCI_E)
713 rxsc_stats->stats.InOctetsDecrypted += skb->len;
714 else
715 rxsc_stats->stats.InOctetsValidated += skb->len;
716 u64_stats_update_end(&rxsc_stats->syncp);
717 }
718
719 if (!macsec_skb_cb(skb)->valid) {
720 spin_unlock(&rx_sa->lock);
721
722 /* 10.6.5 */
723 if (hdr->tci_an & MACSEC_TCI_C ||
724 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
725 u64_stats_update_begin(&rxsc_stats->syncp);
726 rxsc_stats->stats.InPktsNotValid++;
727 u64_stats_update_end(&rxsc_stats->syncp);
728 return false;
729 }
730
731 u64_stats_update_begin(&rxsc_stats->syncp);
732 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
733 rxsc_stats->stats.InPktsInvalid++;
734 this_cpu_inc(rx_sa->stats->InPktsInvalid);
735 } else if (pn < lowest_pn) {
736 rxsc_stats->stats.InPktsDelayed++;
737 } else {
738 rxsc_stats->stats.InPktsUnchecked++;
739 }
740 u64_stats_update_end(&rxsc_stats->syncp);
741 } else {
742 u64_stats_update_begin(&rxsc_stats->syncp);
743 if (pn < lowest_pn) {
744 rxsc_stats->stats.InPktsDelayed++;
745 } else {
746 rxsc_stats->stats.InPktsOK++;
747 this_cpu_inc(rx_sa->stats->InPktsOK);
748 }
749 u64_stats_update_end(&rxsc_stats->syncp);
750
751 if (pn >= rx_sa->next_pn)
752 rx_sa->next_pn = pn + 1;
753 spin_unlock(&rx_sa->lock);
754 }
755
756 return true;
757 }
758
759 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
760 {
761 skb->pkt_type = PACKET_HOST;
762 skb->protocol = eth_type_trans(skb, dev);
763
764 skb_reset_network_header(skb);
765 if (!skb_transport_header_was_set(skb))
766 skb_reset_transport_header(skb);
767 skb_reset_mac_len(skb);
768 }
769
770 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
771 {
772 skb->ip_summed = CHECKSUM_NONE;
773 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
774 skb_pull(skb, hdr_len);
775 pskb_trim_unique(skb, skb->len - icv_len);
776 }
777
778 static void count_rx(struct net_device *dev, int len)
779 {
780 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
781
782 u64_stats_update_begin(&stats->syncp);
783 stats->rx_packets++;
784 stats->rx_bytes += len;
785 u64_stats_update_end(&stats->syncp);
786 }
787
788 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
789 {
790 struct sk_buff *skb = base->data;
791 struct net_device *dev = skb->dev;
792 struct macsec_dev *macsec = macsec_priv(dev);
793 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
794 struct macsec_rx_sc *rx_sc = rx_sa->sc;
795 int len;
796 u32 pn;
797
798 aead_request_free(macsec_skb_cb(skb)->req);
799
800 if (!err)
801 macsec_skb_cb(skb)->valid = true;
802
803 rcu_read_lock_bh();
804 pn = ntohl(macsec_ethhdr(skb)->packet_number);
805 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
806 rcu_read_unlock_bh();
807 kfree_skb(skb);
808 goto out;
809 }
810
811 macsec_finalize_skb(skb, macsec->secy.icv_len,
812 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
813 macsec_reset_skb(skb, macsec->secy.netdev);
814
815 len = skb->len;
816 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
817 count_rx(dev, len);
818
819 rcu_read_unlock_bh();
820
821 out:
822 macsec_rxsa_put(rx_sa);
823 macsec_rxsc_put(rx_sc);
824 dev_put(dev);
825 }
826
827 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
828 struct net_device *dev,
829 struct macsec_rx_sa *rx_sa,
830 sci_t sci,
831 struct macsec_secy *secy)
832 {
833 int ret;
834 struct scatterlist *sg;
835 struct sk_buff *trailer;
836 unsigned char *iv;
837 struct aead_request *req;
838 struct macsec_eth_header *hdr;
839 u16 icv_len = secy->icv_len;
840
841 macsec_skb_cb(skb)->valid = false;
842 skb = skb_share_check(skb, GFP_ATOMIC);
843 if (!skb)
844 return ERR_PTR(-ENOMEM);
845
846 ret = skb_cow_data(skb, 0, &trailer);
847 if (unlikely(ret < 0)) {
848 kfree_skb(skb);
849 return ERR_PTR(ret);
850 }
851 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
852 if (!req) {
853 kfree_skb(skb);
854 return ERR_PTR(-ENOMEM);
855 }
856
857 hdr = (struct macsec_eth_header *)skb->data;
858 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
859
860 sg_init_table(sg, ret);
861 ret = skb_to_sgvec(skb, sg, 0, skb->len);
862 if (unlikely(ret < 0)) {
863 aead_request_free(req);
864 kfree_skb(skb);
865 return ERR_PTR(ret);
866 }
867
868 if (hdr->tci_an & MACSEC_TCI_E) {
869 /* confidentiality: ethernet + macsec header
870 * authenticated, encrypted payload
871 */
872 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
873
874 aead_request_set_crypt(req, sg, sg, len, iv);
875 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
876 skb = skb_unshare(skb, GFP_ATOMIC);
877 if (!skb) {
878 aead_request_free(req);
879 return ERR_PTR(-ENOMEM);
880 }
881 } else {
882 /* integrity only: all headers + data authenticated */
883 aead_request_set_crypt(req, sg, sg, icv_len, iv);
884 aead_request_set_ad(req, skb->len - icv_len);
885 }
886
887 macsec_skb_cb(skb)->req = req;
888 skb->dev = dev;
889 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
890
891 dev_hold(dev);
892 ret = crypto_aead_decrypt(req);
893 if (ret == -EINPROGRESS) {
894 return ERR_PTR(ret);
895 } else if (ret != 0) {
896 /* decryption/authentication failed
897 * 10.6 if validateFrames is disabled, deliver anyway
898 */
899 if (ret != -EBADMSG) {
900 kfree_skb(skb);
901 skb = ERR_PTR(ret);
902 }
903 } else {
904 macsec_skb_cb(skb)->valid = true;
905 }
906 dev_put(dev);
907
908 aead_request_free(req);
909
910 return skb;
911 }
912
913 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
914 {
915 struct macsec_rx_sc *rx_sc;
916
917 for_each_rxsc(secy, rx_sc) {
918 if (rx_sc->sci == sci)
919 return rx_sc;
920 }
921
922 return NULL;
923 }
924
925 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
926 {
927 struct macsec_rx_sc *rx_sc;
928
929 for_each_rxsc_rtnl(secy, rx_sc) {
930 if (rx_sc->sci == sci)
931 return rx_sc;
932 }
933
934 return NULL;
935 }
936
937 static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
938 {
939 /* Deliver to the uncontrolled port by default */
940 enum rx_handler_result ret = RX_HANDLER_PASS;
941 struct macsec_rxh_data *rxd;
942 struct macsec_dev *macsec;
943
944 rcu_read_lock();
945 rxd = macsec_data_rcu(skb->dev);
946
947 /* 10.6 If the management control validateFrames is not
948 * Strict, frames without a SecTAG are received, counted, and
949 * delivered to the Controlled Port
950 */
951 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
952 struct sk_buff *nskb;
953 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
954
955 if (!macsec_is_offloaded(macsec) &&
956 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
957 u64_stats_update_begin(&secy_stats->syncp);
958 secy_stats->stats.InPktsNoTag++;
959 u64_stats_update_end(&secy_stats->syncp);
960 continue;
961 }
962
963 /* deliver on this port */
964 nskb = skb_clone(skb, GFP_ATOMIC);
965 if (!nskb)
966 break;
967
968 nskb->dev = macsec->secy.netdev;
969
970 if (netif_rx(nskb) == NET_RX_SUCCESS) {
971 u64_stats_update_begin(&secy_stats->syncp);
972 secy_stats->stats.InPktsUntagged++;
973 u64_stats_update_end(&secy_stats->syncp);
974 }
975
976 if (netif_running(macsec->secy.netdev) &&
977 macsec_is_offloaded(macsec)) {
978 ret = RX_HANDLER_EXACT;
979 goto out;
980 }
981 }
982
983 out:
984 rcu_read_unlock();
985 return ret;
986 }
987
988 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
989 {
990 struct sk_buff *skb = *pskb;
991 struct net_device *dev = skb->dev;
992 struct macsec_eth_header *hdr;
993 struct macsec_secy *secy = NULL;
994 struct macsec_rx_sc *rx_sc;
995 struct macsec_rx_sa *rx_sa;
996 struct macsec_rxh_data *rxd;
997 struct macsec_dev *macsec;
998 sci_t sci;
999 u32 pn;
1000 bool cbit;
1001 struct pcpu_rx_sc_stats *rxsc_stats;
1002 struct pcpu_secy_stats *secy_stats;
1003 bool pulled_sci;
1004 int ret;
1005
1006 if (skb_headroom(skb) < ETH_HLEN)
1007 goto drop_direct;
1008
1009 hdr = macsec_ethhdr(skb);
1010 if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
1011 return handle_not_macsec(skb);
1012
1013 skb = skb_unshare(skb, GFP_ATOMIC);
1014 *pskb = skb;
1015 if (!skb)
1016 return RX_HANDLER_CONSUMED;
1017
1018 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1019 if (!pulled_sci) {
1020 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1021 goto drop_direct;
1022 }
1023
1024 hdr = macsec_ethhdr(skb);
1025
1026 /* Frames with a SecTAG that has the TCI E bit set but the C
1027 * bit clear are discarded, as this reserved encoding is used
1028 * to identify frames with a SecTAG that are not to be
1029 * delivered to the Controlled Port.
1030 */
1031 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1032 return RX_HANDLER_PASS;
1033
1034 /* now, pull the extra length */
1035 if (hdr->tci_an & MACSEC_TCI_SC) {
1036 if (!pulled_sci)
1037 goto drop_direct;
1038 }
1039
1040 /* ethernet header is part of crypto processing */
1041 skb_push(skb, ETH_HLEN);
1042
1043 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1044 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1045 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1046
1047 rcu_read_lock();
1048 rxd = macsec_data_rcu(skb->dev);
1049
1050 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1051 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1052
1053 sc = sc ? macsec_rxsc_get(sc) : NULL;
1054
1055 if (sc) {
1056 secy = &macsec->secy;
1057 rx_sc = sc;
1058 break;
1059 }
1060 }
1061
1062 if (!secy)
1063 goto nosci;
1064
1065 dev = secy->netdev;
1066 macsec = macsec_priv(dev);
1067 secy_stats = this_cpu_ptr(macsec->stats);
1068 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1069
1070 if (!macsec_validate_skb(skb, secy->icv_len)) {
1071 u64_stats_update_begin(&secy_stats->syncp);
1072 secy_stats->stats.InPktsBadTag++;
1073 u64_stats_update_end(&secy_stats->syncp);
1074 goto drop_nosa;
1075 }
1076
1077 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1078 if (!rx_sa) {
1079 /* 10.6.1 if the SA is not in use */
1080
1081 /* If validateFrames is Strict or the C bit in the
1082 * SecTAG is set, discard
1083 */
1084 if (hdr->tci_an & MACSEC_TCI_C ||
1085 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1086 u64_stats_update_begin(&rxsc_stats->syncp);
1087 rxsc_stats->stats.InPktsNotUsingSA++;
1088 u64_stats_update_end(&rxsc_stats->syncp);
1089 goto drop_nosa;
1090 }
1091
1092 /* not Strict, the frame (with the SecTAG and ICV
1093 * removed) is delivered to the Controlled Port.
1094 */
1095 u64_stats_update_begin(&rxsc_stats->syncp);
1096 rxsc_stats->stats.InPktsUnusedSA++;
1097 u64_stats_update_end(&rxsc_stats->syncp);
1098 goto deliver;
1099 }
1100
1101 /* First, PN check to avoid decrypting obviously wrong packets */
1102 pn = ntohl(hdr->packet_number);
1103 if (secy->replay_protect) {
1104 bool late;
1105
1106 spin_lock(&rx_sa->lock);
1107 late = rx_sa->next_pn >= secy->replay_window &&
1108 pn < (rx_sa->next_pn - secy->replay_window);
1109 spin_unlock(&rx_sa->lock);
1110
1111 if (late) {
1112 u64_stats_update_begin(&rxsc_stats->syncp);
1113 rxsc_stats->stats.InPktsLate++;
1114 u64_stats_update_end(&rxsc_stats->syncp);
1115 goto drop;
1116 }
1117 }
1118
1119 macsec_skb_cb(skb)->rx_sa = rx_sa;
1120
1121 /* Disabled && !changed text => skip validation */
1122 if (hdr->tci_an & MACSEC_TCI_C ||
1123 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1124 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1125
1126 if (IS_ERR(skb)) {
1127 /* the decrypt callback needs the reference */
1128 if (PTR_ERR(skb) != -EINPROGRESS) {
1129 macsec_rxsa_put(rx_sa);
1130 macsec_rxsc_put(rx_sc);
1131 }
1132 rcu_read_unlock();
1133 *pskb = NULL;
1134 return RX_HANDLER_CONSUMED;
1135 }
1136
1137 if (!macsec_post_decrypt(skb, secy, pn))
1138 goto drop;
1139
1140 deliver:
1141 macsec_finalize_skb(skb, secy->icv_len,
1142 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1143 macsec_reset_skb(skb, secy->netdev);
1144
1145 if (rx_sa)
1146 macsec_rxsa_put(rx_sa);
1147 macsec_rxsc_put(rx_sc);
1148
1149 skb_orphan(skb);
1150 ret = gro_cells_receive(&macsec->gro_cells, skb);
1151 if (ret == NET_RX_SUCCESS)
1152 count_rx(dev, skb->len);
1153 else
1154 macsec->secy.netdev->stats.rx_dropped++;
1155
1156 rcu_read_unlock();
1157
1158 *pskb = NULL;
1159 return RX_HANDLER_CONSUMED;
1160
1161 drop:
1162 macsec_rxsa_put(rx_sa);
1163 drop_nosa:
1164 macsec_rxsc_put(rx_sc);
1165 rcu_read_unlock();
1166 drop_direct:
1167 kfree_skb(skb);
1168 *pskb = NULL;
1169 return RX_HANDLER_CONSUMED;
1170
1171 nosci:
1172 /* 10.6.1 if the SC is not found */
1173 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1174 if (!cbit)
1175 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1176 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1177
1178 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1179 struct sk_buff *nskb;
1180
1181 secy_stats = this_cpu_ptr(macsec->stats);
1182
1183 /* If validateFrames is Strict or the C bit in the
1184 * SecTAG is set, discard
1185 */
1186 if (cbit ||
1187 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1188 u64_stats_update_begin(&secy_stats->syncp);
1189 secy_stats->stats.InPktsNoSCI++;
1190 u64_stats_update_end(&secy_stats->syncp);
1191 continue;
1192 }
1193
1194 /* not strict, the frame (with the SecTAG and ICV
1195 * removed) is delivered to the Controlled Port.
1196 */
1197 nskb = skb_clone(skb, GFP_ATOMIC);
1198 if (!nskb)
1199 break;
1200
1201 macsec_reset_skb(nskb, macsec->secy.netdev);
1202
1203 ret = netif_rx(nskb);
1204 if (ret == NET_RX_SUCCESS) {
1205 u64_stats_update_begin(&secy_stats->syncp);
1206 secy_stats->stats.InPktsUnknownSCI++;
1207 u64_stats_update_end(&secy_stats->syncp);
1208 } else {
1209 macsec->secy.netdev->stats.rx_dropped++;
1210 }
1211 }
1212
1213 rcu_read_unlock();
1214 *pskb = skb;
1215 return RX_HANDLER_PASS;
1216 }
1217
1218 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1219 {
1220 struct crypto_aead *tfm;
1221 int ret;
1222
1223 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1224
1225 if (IS_ERR(tfm))
1226 return tfm;
1227
1228 ret = crypto_aead_setkey(tfm, key, key_len);
1229 if (ret < 0)
1230 goto fail;
1231
1232 ret = crypto_aead_setauthsize(tfm, icv_len);
1233 if (ret < 0)
1234 goto fail;
1235
1236 return tfm;
1237 fail:
1238 crypto_free_aead(tfm);
1239 return ERR_PTR(ret);
1240 }
1241
1242 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1243 int icv_len)
1244 {
1245 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1246 if (!rx_sa->stats)
1247 return -ENOMEM;
1248
1249 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1250 if (IS_ERR(rx_sa->key.tfm)) {
1251 free_percpu(rx_sa->stats);
1252 return PTR_ERR(rx_sa->key.tfm);
1253 }
1254
1255 rx_sa->active = false;
1256 rx_sa->next_pn = 1;
1257 refcount_set(&rx_sa->refcnt, 1);
1258 spin_lock_init(&rx_sa->lock);
1259
1260 return 0;
1261 }
1262
1263 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1264 {
1265 rx_sa->active = false;
1266
1267 macsec_rxsa_put(rx_sa);
1268 }
1269
1270 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1271 {
1272 int i;
1273
1274 for (i = 0; i < MACSEC_NUM_AN; i++) {
1275 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1276
1277 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1278 if (sa)
1279 clear_rx_sa(sa);
1280 }
1281
1282 macsec_rxsc_put(rx_sc);
1283 }
1284
1285 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1286 {
1287 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1288
1289 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1290 rx_sc;
1291 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1292 if (rx_sc->sci == sci) {
1293 if (rx_sc->active)
1294 secy->n_rx_sc--;
1295 rcu_assign_pointer(*rx_scp, rx_sc->next);
1296 return rx_sc;
1297 }
1298 }
1299
1300 return NULL;
1301 }
1302
1303 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1304 {
1305 struct macsec_rx_sc *rx_sc;
1306 struct macsec_dev *macsec;
1307 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1308 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1309 struct macsec_secy *secy;
1310
1311 list_for_each_entry(macsec, &rxd->secys, secys) {
1312 if (find_rx_sc_rtnl(&macsec->secy, sci))
1313 return ERR_PTR(-EEXIST);
1314 }
1315
1316 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1317 if (!rx_sc)
1318 return ERR_PTR(-ENOMEM);
1319
1320 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1321 if (!rx_sc->stats) {
1322 kfree(rx_sc);
1323 return ERR_PTR(-ENOMEM);
1324 }
1325
1326 rx_sc->sci = sci;
1327 rx_sc->active = true;
1328 refcount_set(&rx_sc->refcnt, 1);
1329
1330 secy = &macsec_priv(dev)->secy;
1331 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1332 rcu_assign_pointer(secy->rx_sc, rx_sc);
1333
1334 if (rx_sc->active)
1335 secy->n_rx_sc++;
1336
1337 return rx_sc;
1338 }
1339
1340 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1341 int icv_len)
1342 {
1343 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1344 if (!tx_sa->stats)
1345 return -ENOMEM;
1346
1347 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1348 if (IS_ERR(tx_sa->key.tfm)) {
1349 free_percpu(tx_sa->stats);
1350 return PTR_ERR(tx_sa->key.tfm);
1351 }
1352
1353 tx_sa->active = false;
1354 refcount_set(&tx_sa->refcnt, 1);
1355 spin_lock_init(&tx_sa->lock);
1356
1357 return 0;
1358 }
1359
1360 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1361 {
1362 tx_sa->active = false;
1363
1364 macsec_txsa_put(tx_sa);
1365 }
1366
1367 static struct genl_family macsec_fam;
1368
1369 static struct net_device *get_dev_from_nl(struct net *net,
1370 struct nlattr **attrs)
1371 {
1372 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1373 struct net_device *dev;
1374
1375 dev = __dev_get_by_index(net, ifindex);
1376 if (!dev)
1377 return ERR_PTR(-ENODEV);
1378
1379 if (!netif_is_macsec(dev))
1380 return ERR_PTR(-ENODEV);
1381
1382 return dev;
1383 }
1384
1385 static sci_t nla_get_sci(const struct nlattr *nla)
1386 {
1387 return (__force sci_t)nla_get_u64(nla);
1388 }
1389
1390 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1391 int padattr)
1392 {
1393 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1394 }
1395
1396 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1397 struct nlattr **attrs,
1398 struct nlattr **tb_sa,
1399 struct net_device **devp,
1400 struct macsec_secy **secyp,
1401 struct macsec_tx_sc **scp,
1402 u8 *assoc_num)
1403 {
1404 struct net_device *dev;
1405 struct macsec_secy *secy;
1406 struct macsec_tx_sc *tx_sc;
1407 struct macsec_tx_sa *tx_sa;
1408
1409 if (!tb_sa[MACSEC_SA_ATTR_AN])
1410 return ERR_PTR(-EINVAL);
1411
1412 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1413
1414 dev = get_dev_from_nl(net, attrs);
1415 if (IS_ERR(dev))
1416 return ERR_CAST(dev);
1417
1418 if (*assoc_num >= MACSEC_NUM_AN)
1419 return ERR_PTR(-EINVAL);
1420
1421 secy = &macsec_priv(dev)->secy;
1422 tx_sc = &secy->tx_sc;
1423
1424 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1425 if (!tx_sa)
1426 return ERR_PTR(-ENODEV);
1427
1428 *devp = dev;
1429 *scp = tx_sc;
1430 *secyp = secy;
1431 return tx_sa;
1432 }
1433
1434 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1435 struct nlattr **attrs,
1436 struct nlattr **tb_rxsc,
1437 struct net_device **devp,
1438 struct macsec_secy **secyp)
1439 {
1440 struct net_device *dev;
1441 struct macsec_secy *secy;
1442 struct macsec_rx_sc *rx_sc;
1443 sci_t sci;
1444
1445 dev = get_dev_from_nl(net, attrs);
1446 if (IS_ERR(dev))
1447 return ERR_CAST(dev);
1448
1449 secy = &macsec_priv(dev)->secy;
1450
1451 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1452 return ERR_PTR(-EINVAL);
1453
1454 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1455 rx_sc = find_rx_sc_rtnl(secy, sci);
1456 if (!rx_sc)
1457 return ERR_PTR(-ENODEV);
1458
1459 *secyp = secy;
1460 *devp = dev;
1461
1462 return rx_sc;
1463 }
1464
1465 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1466 struct nlattr **attrs,
1467 struct nlattr **tb_rxsc,
1468 struct nlattr **tb_sa,
1469 struct net_device **devp,
1470 struct macsec_secy **secyp,
1471 struct macsec_rx_sc **scp,
1472 u8 *assoc_num)
1473 {
1474 struct macsec_rx_sc *rx_sc;
1475 struct macsec_rx_sa *rx_sa;
1476
1477 if (!tb_sa[MACSEC_SA_ATTR_AN])
1478 return ERR_PTR(-EINVAL);
1479
1480 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1481 if (*assoc_num >= MACSEC_NUM_AN)
1482 return ERR_PTR(-EINVAL);
1483
1484 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1485 if (IS_ERR(rx_sc))
1486 return ERR_CAST(rx_sc);
1487
1488 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1489 if (!rx_sa)
1490 return ERR_PTR(-ENODEV);
1491
1492 *scp = rx_sc;
1493 return rx_sa;
1494 }
1495
1496 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1497 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1498 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1499 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1500 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1501 };
1502
1503 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1504 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1505 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1506 };
1507
1508 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1509 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1510 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1511 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1512 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1513 .len = MACSEC_KEYID_LEN, },
1514 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1515 .len = MACSEC_MAX_KEY_LEN, },
1516 };
1517
1518 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
1519 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
1520 };
1521
1522 /* Offloads an operation to a device driver */
1523 static int macsec_offload(int (* const func)(struct macsec_context *),
1524 struct macsec_context *ctx)
1525 {
1526 int ret;
1527
1528 if (unlikely(!func))
1529 return 0;
1530
1531 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1532 mutex_lock(&ctx->phydev->lock);
1533
1534 /* Phase I: prepare. The drive should fail here if there are going to be
1535 * issues in the commit phase.
1536 */
1537 ctx->prepare = true;
1538 ret = (*func)(ctx);
1539 if (ret)
1540 goto phy_unlock;
1541
1542 /* Phase II: commit. This step cannot fail. */
1543 ctx->prepare = false;
1544 ret = (*func)(ctx);
1545 /* This should never happen: commit is not allowed to fail */
1546 if (unlikely(ret))
1547 WARN(1, "MACsec offloading commit failed (%d)\n", ret);
1548
1549 phy_unlock:
1550 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1551 mutex_unlock(&ctx->phydev->lock);
1552
1553 return ret;
1554 }
1555
1556 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1557 {
1558 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1559 return -EINVAL;
1560
1561 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1562 return -EINVAL;
1563
1564 return 0;
1565 }
1566
1567 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1568 {
1569 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1570 return -EINVAL;
1571
1572 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1573 return -EINVAL;
1574
1575 return 0;
1576 }
1577
1578 static bool validate_add_rxsa(struct nlattr **attrs)
1579 {
1580 if (!attrs[MACSEC_SA_ATTR_AN] ||
1581 !attrs[MACSEC_SA_ATTR_KEY] ||
1582 !attrs[MACSEC_SA_ATTR_KEYID])
1583 return false;
1584
1585 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1586 return false;
1587
1588 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1589 return false;
1590
1591 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1592 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1593 return false;
1594 }
1595
1596 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1597 return false;
1598
1599 return true;
1600 }
1601
1602 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1603 {
1604 struct net_device *dev;
1605 struct nlattr **attrs = info->attrs;
1606 struct macsec_secy *secy;
1607 struct macsec_rx_sc *rx_sc;
1608 struct macsec_rx_sa *rx_sa;
1609 unsigned char assoc_num;
1610 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1611 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1612 int err;
1613
1614 if (!attrs[MACSEC_ATTR_IFINDEX])
1615 return -EINVAL;
1616
1617 if (parse_sa_config(attrs, tb_sa))
1618 return -EINVAL;
1619
1620 if (parse_rxsc_config(attrs, tb_rxsc))
1621 return -EINVAL;
1622
1623 if (!validate_add_rxsa(tb_sa))
1624 return -EINVAL;
1625
1626 rtnl_lock();
1627 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1628 if (IS_ERR(rx_sc)) {
1629 rtnl_unlock();
1630 return PTR_ERR(rx_sc);
1631 }
1632
1633 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1634
1635 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1636 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1637 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1638 rtnl_unlock();
1639 return -EINVAL;
1640 }
1641
1642 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1643 if (rx_sa) {
1644 rtnl_unlock();
1645 return -EBUSY;
1646 }
1647
1648 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1649 if (!rx_sa) {
1650 rtnl_unlock();
1651 return -ENOMEM;
1652 }
1653
1654 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1655 secy->key_len, secy->icv_len);
1656 if (err < 0) {
1657 kfree(rx_sa);
1658 rtnl_unlock();
1659 return err;
1660 }
1661
1662 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1663 spin_lock_bh(&rx_sa->lock);
1664 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1665 spin_unlock_bh(&rx_sa->lock);
1666 }
1667
1668 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1669 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1670
1671 rx_sa->sc = rx_sc;
1672
1673 /* If h/w offloading is available, propagate to the device */
1674 if (macsec_is_offloaded(netdev_priv(dev))) {
1675 const struct macsec_ops *ops;
1676 struct macsec_context ctx;
1677
1678 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1679 if (!ops) {
1680 err = -EOPNOTSUPP;
1681 goto cleanup;
1682 }
1683
1684 ctx.sa.assoc_num = assoc_num;
1685 ctx.sa.rx_sa = rx_sa;
1686 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1687 MACSEC_KEYID_LEN);
1688
1689 err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1690 if (err)
1691 goto cleanup;
1692 }
1693
1694 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1695 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1696
1697 rtnl_unlock();
1698
1699 return 0;
1700
1701 cleanup:
1702 kfree(rx_sa);
1703 rtnl_unlock();
1704 return err;
1705 }
1706
1707 static bool validate_add_rxsc(struct nlattr **attrs)
1708 {
1709 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1710 return false;
1711
1712 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1713 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1714 return false;
1715 }
1716
1717 return true;
1718 }
1719
1720 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1721 {
1722 struct net_device *dev;
1723 sci_t sci = MACSEC_UNDEF_SCI;
1724 struct nlattr **attrs = info->attrs;
1725 struct macsec_rx_sc *rx_sc;
1726 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1727 bool was_active;
1728 int ret;
1729
1730 if (!attrs[MACSEC_ATTR_IFINDEX])
1731 return -EINVAL;
1732
1733 if (parse_rxsc_config(attrs, tb_rxsc))
1734 return -EINVAL;
1735
1736 if (!validate_add_rxsc(tb_rxsc))
1737 return -EINVAL;
1738
1739 rtnl_lock();
1740 dev = get_dev_from_nl(genl_info_net(info), attrs);
1741 if (IS_ERR(dev)) {
1742 rtnl_unlock();
1743 return PTR_ERR(dev);
1744 }
1745
1746 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1747
1748 rx_sc = create_rx_sc(dev, sci);
1749 if (IS_ERR(rx_sc)) {
1750 rtnl_unlock();
1751 return PTR_ERR(rx_sc);
1752 }
1753
1754 was_active = rx_sc->active;
1755 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1756 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1757
1758 if (macsec_is_offloaded(netdev_priv(dev))) {
1759 const struct macsec_ops *ops;
1760 struct macsec_context ctx;
1761
1762 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1763 if (!ops) {
1764 ret = -EOPNOTSUPP;
1765 goto cleanup;
1766 }
1767
1768 ctx.rx_sc = rx_sc;
1769
1770 ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1771 if (ret)
1772 goto cleanup;
1773 }
1774
1775 rtnl_unlock();
1776
1777 return 0;
1778
1779 cleanup:
1780 rx_sc->active = was_active;
1781 rtnl_unlock();
1782 return ret;
1783 }
1784
1785 static bool validate_add_txsa(struct nlattr **attrs)
1786 {
1787 if (!attrs[MACSEC_SA_ATTR_AN] ||
1788 !attrs[MACSEC_SA_ATTR_PN] ||
1789 !attrs[MACSEC_SA_ATTR_KEY] ||
1790 !attrs[MACSEC_SA_ATTR_KEYID])
1791 return false;
1792
1793 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1794 return false;
1795
1796 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1797 return false;
1798
1799 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1800 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1801 return false;
1802 }
1803
1804 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1805 return false;
1806
1807 return true;
1808 }
1809
1810 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1811 {
1812 struct net_device *dev;
1813 struct nlattr **attrs = info->attrs;
1814 struct macsec_secy *secy;
1815 struct macsec_tx_sc *tx_sc;
1816 struct macsec_tx_sa *tx_sa;
1817 unsigned char assoc_num;
1818 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1819 bool was_operational;
1820 int err;
1821
1822 if (!attrs[MACSEC_ATTR_IFINDEX])
1823 return -EINVAL;
1824
1825 if (parse_sa_config(attrs, tb_sa))
1826 return -EINVAL;
1827
1828 if (!validate_add_txsa(tb_sa))
1829 return -EINVAL;
1830
1831 rtnl_lock();
1832 dev = get_dev_from_nl(genl_info_net(info), attrs);
1833 if (IS_ERR(dev)) {
1834 rtnl_unlock();
1835 return PTR_ERR(dev);
1836 }
1837
1838 secy = &macsec_priv(dev)->secy;
1839 tx_sc = &secy->tx_sc;
1840
1841 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1842
1843 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1844 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1845 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1846 rtnl_unlock();
1847 return -EINVAL;
1848 }
1849
1850 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1851 if (tx_sa) {
1852 rtnl_unlock();
1853 return -EBUSY;
1854 }
1855
1856 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1857 if (!tx_sa) {
1858 rtnl_unlock();
1859 return -ENOMEM;
1860 }
1861
1862 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1863 secy->key_len, secy->icv_len);
1864 if (err < 0) {
1865 kfree(tx_sa);
1866 rtnl_unlock();
1867 return err;
1868 }
1869
1870 spin_lock_bh(&tx_sa->lock);
1871 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1872 spin_unlock_bh(&tx_sa->lock);
1873
1874 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1875 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1876
1877 was_operational = secy->operational;
1878 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1879 secy->operational = true;
1880
1881 /* If h/w offloading is available, propagate to the device */
1882 if (macsec_is_offloaded(netdev_priv(dev))) {
1883 const struct macsec_ops *ops;
1884 struct macsec_context ctx;
1885
1886 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1887 if (!ops) {
1888 err = -EOPNOTSUPP;
1889 goto cleanup;
1890 }
1891
1892 ctx.sa.assoc_num = assoc_num;
1893 ctx.sa.tx_sa = tx_sa;
1894 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1895 MACSEC_KEYID_LEN);
1896
1897 err = macsec_offload(ops->mdo_add_txsa, &ctx);
1898 if (err)
1899 goto cleanup;
1900 }
1901
1902 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1903 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1904
1905 rtnl_unlock();
1906
1907 return 0;
1908
1909 cleanup:
1910 secy->operational = was_operational;
1911 kfree(tx_sa);
1912 rtnl_unlock();
1913 return err;
1914 }
1915
1916 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1917 {
1918 struct nlattr **attrs = info->attrs;
1919 struct net_device *dev;
1920 struct macsec_secy *secy;
1921 struct macsec_rx_sc *rx_sc;
1922 struct macsec_rx_sa *rx_sa;
1923 u8 assoc_num;
1924 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1925 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1926 int ret;
1927
1928 if (!attrs[MACSEC_ATTR_IFINDEX])
1929 return -EINVAL;
1930
1931 if (parse_sa_config(attrs, tb_sa))
1932 return -EINVAL;
1933
1934 if (parse_rxsc_config(attrs, tb_rxsc))
1935 return -EINVAL;
1936
1937 rtnl_lock();
1938 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1939 &dev, &secy, &rx_sc, &assoc_num);
1940 if (IS_ERR(rx_sa)) {
1941 rtnl_unlock();
1942 return PTR_ERR(rx_sa);
1943 }
1944
1945 if (rx_sa->active) {
1946 rtnl_unlock();
1947 return -EBUSY;
1948 }
1949
1950 /* If h/w offloading is available, propagate to the device */
1951 if (macsec_is_offloaded(netdev_priv(dev))) {
1952 const struct macsec_ops *ops;
1953 struct macsec_context ctx;
1954
1955 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1956 if (!ops) {
1957 ret = -EOPNOTSUPP;
1958 goto cleanup;
1959 }
1960
1961 ctx.sa.assoc_num = assoc_num;
1962 ctx.sa.rx_sa = rx_sa;
1963
1964 ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
1965 if (ret)
1966 goto cleanup;
1967 }
1968
1969 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1970 clear_rx_sa(rx_sa);
1971
1972 rtnl_unlock();
1973
1974 return 0;
1975
1976 cleanup:
1977 rtnl_unlock();
1978 return ret;
1979 }
1980
1981 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1982 {
1983 struct nlattr **attrs = info->attrs;
1984 struct net_device *dev;
1985 struct macsec_secy *secy;
1986 struct macsec_rx_sc *rx_sc;
1987 sci_t sci;
1988 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1989 int ret;
1990
1991 if (!attrs[MACSEC_ATTR_IFINDEX])
1992 return -EINVAL;
1993
1994 if (parse_rxsc_config(attrs, tb_rxsc))
1995 return -EINVAL;
1996
1997 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1998 return -EINVAL;
1999
2000 rtnl_lock();
2001 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2002 if (IS_ERR(dev)) {
2003 rtnl_unlock();
2004 return PTR_ERR(dev);
2005 }
2006
2007 secy = &macsec_priv(dev)->secy;
2008 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2009
2010 rx_sc = del_rx_sc(secy, sci);
2011 if (!rx_sc) {
2012 rtnl_unlock();
2013 return -ENODEV;
2014 }
2015
2016 /* If h/w offloading is available, propagate to the device */
2017 if (macsec_is_offloaded(netdev_priv(dev))) {
2018 const struct macsec_ops *ops;
2019 struct macsec_context ctx;
2020
2021 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2022 if (!ops) {
2023 ret = -EOPNOTSUPP;
2024 goto cleanup;
2025 }
2026
2027 ctx.rx_sc = rx_sc;
2028 ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2029 if (ret)
2030 goto cleanup;
2031 }
2032
2033 free_rx_sc(rx_sc);
2034 rtnl_unlock();
2035
2036 return 0;
2037
2038 cleanup:
2039 rtnl_unlock();
2040 return ret;
2041 }
2042
2043 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2044 {
2045 struct nlattr **attrs = info->attrs;
2046 struct net_device *dev;
2047 struct macsec_secy *secy;
2048 struct macsec_tx_sc *tx_sc;
2049 struct macsec_tx_sa *tx_sa;
2050 u8 assoc_num;
2051 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2052 int ret;
2053
2054 if (!attrs[MACSEC_ATTR_IFINDEX])
2055 return -EINVAL;
2056
2057 if (parse_sa_config(attrs, tb_sa))
2058 return -EINVAL;
2059
2060 rtnl_lock();
2061 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2062 &dev, &secy, &tx_sc, &assoc_num);
2063 if (IS_ERR(tx_sa)) {
2064 rtnl_unlock();
2065 return PTR_ERR(tx_sa);
2066 }
2067
2068 if (tx_sa->active) {
2069 rtnl_unlock();
2070 return -EBUSY;
2071 }
2072
2073 /* If h/w offloading is available, propagate to the device */
2074 if (macsec_is_offloaded(netdev_priv(dev))) {
2075 const struct macsec_ops *ops;
2076 struct macsec_context ctx;
2077
2078 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2079 if (!ops) {
2080 ret = -EOPNOTSUPP;
2081 goto cleanup;
2082 }
2083
2084 ctx.sa.assoc_num = assoc_num;
2085 ctx.sa.tx_sa = tx_sa;
2086
2087 ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2088 if (ret)
2089 goto cleanup;
2090 }
2091
2092 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2093 clear_tx_sa(tx_sa);
2094
2095 rtnl_unlock();
2096
2097 return 0;
2098
2099 cleanup:
2100 rtnl_unlock();
2101 return ret;
2102 }
2103
2104 static bool validate_upd_sa(struct nlattr **attrs)
2105 {
2106 if (!attrs[MACSEC_SA_ATTR_AN] ||
2107 attrs[MACSEC_SA_ATTR_KEY] ||
2108 attrs[MACSEC_SA_ATTR_KEYID])
2109 return false;
2110
2111 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2112 return false;
2113
2114 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
2115 return false;
2116
2117 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2118 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2119 return false;
2120 }
2121
2122 return true;
2123 }
2124
2125 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2126 {
2127 struct nlattr **attrs = info->attrs;
2128 struct net_device *dev;
2129 struct macsec_secy *secy;
2130 struct macsec_tx_sc *tx_sc;
2131 struct macsec_tx_sa *tx_sa;
2132 u8 assoc_num;
2133 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2134 bool was_operational, was_active;
2135 u32 prev_pn = 0;
2136 int ret = 0;
2137
2138 if (!attrs[MACSEC_ATTR_IFINDEX])
2139 return -EINVAL;
2140
2141 if (parse_sa_config(attrs, tb_sa))
2142 return -EINVAL;
2143
2144 if (!validate_upd_sa(tb_sa))
2145 return -EINVAL;
2146
2147 rtnl_lock();
2148 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2149 &dev, &secy, &tx_sc, &assoc_num);
2150 if (IS_ERR(tx_sa)) {
2151 rtnl_unlock();
2152 return PTR_ERR(tx_sa);
2153 }
2154
2155 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2156 spin_lock_bh(&tx_sa->lock);
2157 prev_pn = tx_sa->next_pn;
2158 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2159 spin_unlock_bh(&tx_sa->lock);
2160 }
2161
2162 was_active = tx_sa->active;
2163 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2164 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2165
2166 was_operational = secy->operational;
2167 if (assoc_num == tx_sc->encoding_sa)
2168 secy->operational = tx_sa->active;
2169
2170 /* If h/w offloading is available, propagate to the device */
2171 if (macsec_is_offloaded(netdev_priv(dev))) {
2172 const struct macsec_ops *ops;
2173 struct macsec_context ctx;
2174
2175 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2176 if (!ops) {
2177 ret = -EOPNOTSUPP;
2178 goto cleanup;
2179 }
2180
2181 ctx.sa.assoc_num = assoc_num;
2182 ctx.sa.tx_sa = tx_sa;
2183
2184 ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
2185 if (ret)
2186 goto cleanup;
2187 }
2188
2189 rtnl_unlock();
2190
2191 return 0;
2192
2193 cleanup:
2194 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2195 spin_lock_bh(&tx_sa->lock);
2196 tx_sa->next_pn = prev_pn;
2197 spin_unlock_bh(&tx_sa->lock);
2198 }
2199 tx_sa->active = was_active;
2200 secy->operational = was_operational;
2201 rtnl_unlock();
2202 return ret;
2203 }
2204
2205 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2206 {
2207 struct nlattr **attrs = info->attrs;
2208 struct net_device *dev;
2209 struct macsec_secy *secy;
2210 struct macsec_rx_sc *rx_sc;
2211 struct macsec_rx_sa *rx_sa;
2212 u8 assoc_num;
2213 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2214 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2215 bool was_active;
2216 u32 prev_pn = 0;
2217 int ret = 0;
2218
2219 if (!attrs[MACSEC_ATTR_IFINDEX])
2220 return -EINVAL;
2221
2222 if (parse_rxsc_config(attrs, tb_rxsc))
2223 return -EINVAL;
2224
2225 if (parse_sa_config(attrs, tb_sa))
2226 return -EINVAL;
2227
2228 if (!validate_upd_sa(tb_sa))
2229 return -EINVAL;
2230
2231 rtnl_lock();
2232 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2233 &dev, &secy, &rx_sc, &assoc_num);
2234 if (IS_ERR(rx_sa)) {
2235 rtnl_unlock();
2236 return PTR_ERR(rx_sa);
2237 }
2238
2239 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2240 spin_lock_bh(&rx_sa->lock);
2241 prev_pn = rx_sa->next_pn;
2242 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2243 spin_unlock_bh(&rx_sa->lock);
2244 }
2245
2246 was_active = rx_sa->active;
2247 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2248 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2249
2250 /* If h/w offloading is available, propagate to the device */
2251 if (macsec_is_offloaded(netdev_priv(dev))) {
2252 const struct macsec_ops *ops;
2253 struct macsec_context ctx;
2254
2255 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2256 if (!ops) {
2257 ret = -EOPNOTSUPP;
2258 goto cleanup;
2259 }
2260
2261 ctx.sa.assoc_num = assoc_num;
2262 ctx.sa.rx_sa = rx_sa;
2263
2264 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2265 if (ret)
2266 goto cleanup;
2267 }
2268
2269 rtnl_unlock();
2270 return 0;
2271
2272 cleanup:
2273 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2274 spin_lock_bh(&rx_sa->lock);
2275 rx_sa->next_pn = prev_pn;
2276 spin_unlock_bh(&rx_sa->lock);
2277 }
2278 rx_sa->active = was_active;
2279 rtnl_unlock();
2280 return ret;
2281 }
2282
2283 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2284 {
2285 struct nlattr **attrs = info->attrs;
2286 struct net_device *dev;
2287 struct macsec_secy *secy;
2288 struct macsec_rx_sc *rx_sc;
2289 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2290 unsigned int prev_n_rx_sc;
2291 bool was_active;
2292 int ret;
2293
2294 if (!attrs[MACSEC_ATTR_IFINDEX])
2295 return -EINVAL;
2296
2297 if (parse_rxsc_config(attrs, tb_rxsc))
2298 return -EINVAL;
2299
2300 if (!validate_add_rxsc(tb_rxsc))
2301 return -EINVAL;
2302
2303 rtnl_lock();
2304 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2305 if (IS_ERR(rx_sc)) {
2306 rtnl_unlock();
2307 return PTR_ERR(rx_sc);
2308 }
2309
2310 was_active = rx_sc->active;
2311 prev_n_rx_sc = secy->n_rx_sc;
2312 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2313 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2314
2315 if (rx_sc->active != new)
2316 secy->n_rx_sc += new ? 1 : -1;
2317
2318 rx_sc->active = new;
2319 }
2320
2321 /* If h/w offloading is available, propagate to the device */
2322 if (macsec_is_offloaded(netdev_priv(dev))) {
2323 const struct macsec_ops *ops;
2324 struct macsec_context ctx;
2325
2326 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2327 if (!ops) {
2328 ret = -EOPNOTSUPP;
2329 goto cleanup;
2330 }
2331
2332 ctx.rx_sc = rx_sc;
2333
2334 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2335 if (ret)
2336 goto cleanup;
2337 }
2338
2339 rtnl_unlock();
2340
2341 return 0;
2342
2343 cleanup:
2344 secy->n_rx_sc = prev_n_rx_sc;
2345 rx_sc->active = was_active;
2346 rtnl_unlock();
2347 return ret;
2348 }
2349
2350 static bool macsec_is_configured(struct macsec_dev *macsec)
2351 {
2352 struct macsec_secy *secy = &macsec->secy;
2353 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2354 int i;
2355
2356 if (secy->n_rx_sc > 0)
2357 return true;
2358
2359 for (i = 0; i < MACSEC_NUM_AN; i++)
2360 if (tx_sc->sa[i])
2361 return true;
2362
2363 return false;
2364 }
2365
2366 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2367 {
2368 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2369 enum macsec_offload offload, prev_offload;
2370 int (*func)(struct macsec_context *ctx);
2371 struct nlattr **attrs = info->attrs;
2372 struct net_device *dev, *loop_dev;
2373 const struct macsec_ops *ops;
2374 struct macsec_context ctx;
2375 struct macsec_dev *macsec;
2376 struct net *loop_net;
2377 int ret;
2378
2379 if (!attrs[MACSEC_ATTR_IFINDEX])
2380 return -EINVAL;
2381
2382 if (!attrs[MACSEC_ATTR_OFFLOAD])
2383 return -EINVAL;
2384
2385 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2386 attrs[MACSEC_ATTR_OFFLOAD],
2387 macsec_genl_offload_policy, NULL))
2388 return -EINVAL;
2389
2390 dev = get_dev_from_nl(genl_info_net(info), attrs);
2391 if (IS_ERR(dev))
2392 return PTR_ERR(dev);
2393 macsec = macsec_priv(dev);
2394
2395 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2396 if (macsec->offload == offload)
2397 return 0;
2398
2399 /* Check if the offloading mode is supported by the underlying layers */
2400 if (offload != MACSEC_OFFLOAD_OFF &&
2401 !macsec_check_offload(offload, macsec))
2402 return -EOPNOTSUPP;
2403
2404 if (offload == MACSEC_OFFLOAD_OFF)
2405 goto skip_limitation;
2406
2407 /* Check the physical interface isn't offloading another interface
2408 * first.
2409 */
2410 for_each_net(loop_net) {
2411 for_each_netdev(loop_net, loop_dev) {
2412 struct macsec_dev *priv;
2413
2414 if (!netif_is_macsec(loop_dev))
2415 continue;
2416
2417 priv = macsec_priv(loop_dev);
2418
2419 if (priv->real_dev == macsec->real_dev &&
2420 priv->offload != MACSEC_OFFLOAD_OFF)
2421 return -EBUSY;
2422 }
2423 }
2424
2425 skip_limitation:
2426 /* Check if the net device is busy. */
2427 if (netif_running(dev))
2428 return -EBUSY;
2429
2430 rtnl_lock();
2431
2432 prev_offload = macsec->offload;
2433 macsec->offload = offload;
2434
2435 /* Check if the device already has rules configured: we do not support
2436 * rules migration.
2437 */
2438 if (macsec_is_configured(macsec)) {
2439 ret = -EBUSY;
2440 goto rollback;
2441 }
2442
2443 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2444 macsec, &ctx);
2445 if (!ops) {
2446 ret = -EOPNOTSUPP;
2447 goto rollback;
2448 }
2449
2450 if (prev_offload == MACSEC_OFFLOAD_OFF)
2451 func = ops->mdo_add_secy;
2452 else
2453 func = ops->mdo_del_secy;
2454
2455 ctx.secy = &macsec->secy;
2456 ret = macsec_offload(func, &ctx);
2457 if (ret)
2458 goto rollback;
2459
2460 rtnl_unlock();
2461 return 0;
2462
2463 rollback:
2464 macsec->offload = prev_offload;
2465
2466 rtnl_unlock();
2467 return ret;
2468 }
2469
2470 static int copy_tx_sa_stats(struct sk_buff *skb,
2471 struct macsec_tx_sa_stats __percpu *pstats)
2472 {
2473 struct macsec_tx_sa_stats sum = {0, };
2474 int cpu;
2475
2476 for_each_possible_cpu(cpu) {
2477 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2478
2479 sum.OutPktsProtected += stats->OutPktsProtected;
2480 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2481 }
2482
2483 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2484 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2485 return -EMSGSIZE;
2486
2487 return 0;
2488 }
2489
2490 static noinline_for_stack int
2491 copy_rx_sa_stats(struct sk_buff *skb,
2492 struct macsec_rx_sa_stats __percpu *pstats)
2493 {
2494 struct macsec_rx_sa_stats sum = {0, };
2495 int cpu;
2496
2497 for_each_possible_cpu(cpu) {
2498 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2499
2500 sum.InPktsOK += stats->InPktsOK;
2501 sum.InPktsInvalid += stats->InPktsInvalid;
2502 sum.InPktsNotValid += stats->InPktsNotValid;
2503 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2504 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2505 }
2506
2507 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2508 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2509 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2510 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2511 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2512 return -EMSGSIZE;
2513
2514 return 0;
2515 }
2516
2517 static noinline_for_stack int
2518 copy_rx_sc_stats(struct sk_buff *skb, struct pcpu_rx_sc_stats __percpu *pstats)
2519 {
2520 struct macsec_rx_sc_stats sum = {0, };
2521 int cpu;
2522
2523 for_each_possible_cpu(cpu) {
2524 const struct pcpu_rx_sc_stats *stats;
2525 struct macsec_rx_sc_stats tmp;
2526 unsigned int start;
2527
2528 stats = per_cpu_ptr(pstats, cpu);
2529 do {
2530 start = u64_stats_fetch_begin_irq(&stats->syncp);
2531 memcpy(&tmp, &stats->stats, sizeof(tmp));
2532 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2533
2534 sum.InOctetsValidated += tmp.InOctetsValidated;
2535 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2536 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2537 sum.InPktsDelayed += tmp.InPktsDelayed;
2538 sum.InPktsOK += tmp.InPktsOK;
2539 sum.InPktsInvalid += tmp.InPktsInvalid;
2540 sum.InPktsLate += tmp.InPktsLate;
2541 sum.InPktsNotValid += tmp.InPktsNotValid;
2542 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2543 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2544 }
2545
2546 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2547 sum.InOctetsValidated,
2548 MACSEC_RXSC_STATS_ATTR_PAD) ||
2549 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2550 sum.InOctetsDecrypted,
2551 MACSEC_RXSC_STATS_ATTR_PAD) ||
2552 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2553 sum.InPktsUnchecked,
2554 MACSEC_RXSC_STATS_ATTR_PAD) ||
2555 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2556 sum.InPktsDelayed,
2557 MACSEC_RXSC_STATS_ATTR_PAD) ||
2558 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2559 sum.InPktsOK,
2560 MACSEC_RXSC_STATS_ATTR_PAD) ||
2561 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2562 sum.InPktsInvalid,
2563 MACSEC_RXSC_STATS_ATTR_PAD) ||
2564 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2565 sum.InPktsLate,
2566 MACSEC_RXSC_STATS_ATTR_PAD) ||
2567 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2568 sum.InPktsNotValid,
2569 MACSEC_RXSC_STATS_ATTR_PAD) ||
2570 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2571 sum.InPktsNotUsingSA,
2572 MACSEC_RXSC_STATS_ATTR_PAD) ||
2573 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2574 sum.InPktsUnusedSA,
2575 MACSEC_RXSC_STATS_ATTR_PAD))
2576 return -EMSGSIZE;
2577
2578 return 0;
2579 }
2580
2581 static noinline_for_stack int
2582 copy_tx_sc_stats(struct sk_buff *skb, struct pcpu_tx_sc_stats __percpu *pstats)
2583 {
2584 struct macsec_tx_sc_stats sum = {0, };
2585 int cpu;
2586
2587 for_each_possible_cpu(cpu) {
2588 const struct pcpu_tx_sc_stats *stats;
2589 struct macsec_tx_sc_stats tmp;
2590 unsigned int start;
2591
2592 stats = per_cpu_ptr(pstats, cpu);
2593 do {
2594 start = u64_stats_fetch_begin_irq(&stats->syncp);
2595 memcpy(&tmp, &stats->stats, sizeof(tmp));
2596 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2597
2598 sum.OutPktsProtected += tmp.OutPktsProtected;
2599 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2600 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2601 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2602 }
2603
2604 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2605 sum.OutPktsProtected,
2606 MACSEC_TXSC_STATS_ATTR_PAD) ||
2607 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2608 sum.OutPktsEncrypted,
2609 MACSEC_TXSC_STATS_ATTR_PAD) ||
2610 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2611 sum.OutOctetsProtected,
2612 MACSEC_TXSC_STATS_ATTR_PAD) ||
2613 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2614 sum.OutOctetsEncrypted,
2615 MACSEC_TXSC_STATS_ATTR_PAD))
2616 return -EMSGSIZE;
2617
2618 return 0;
2619 }
2620
2621 static noinline_for_stack int
2622 copy_secy_stats(struct sk_buff *skb, struct pcpu_secy_stats __percpu *pstats)
2623 {
2624 struct macsec_dev_stats sum = {0, };
2625 int cpu;
2626
2627 for_each_possible_cpu(cpu) {
2628 const struct pcpu_secy_stats *stats;
2629 struct macsec_dev_stats tmp;
2630 unsigned int start;
2631
2632 stats = per_cpu_ptr(pstats, cpu);
2633 do {
2634 start = u64_stats_fetch_begin_irq(&stats->syncp);
2635 memcpy(&tmp, &stats->stats, sizeof(tmp));
2636 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2637
2638 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2639 sum.InPktsUntagged += tmp.InPktsUntagged;
2640 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2641 sum.InPktsNoTag += tmp.InPktsNoTag;
2642 sum.InPktsBadTag += tmp.InPktsBadTag;
2643 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2644 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2645 sum.InPktsOverrun += tmp.InPktsOverrun;
2646 }
2647
2648 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2649 sum.OutPktsUntagged,
2650 MACSEC_SECY_STATS_ATTR_PAD) ||
2651 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2652 sum.InPktsUntagged,
2653 MACSEC_SECY_STATS_ATTR_PAD) ||
2654 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2655 sum.OutPktsTooLong,
2656 MACSEC_SECY_STATS_ATTR_PAD) ||
2657 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2658 sum.InPktsNoTag,
2659 MACSEC_SECY_STATS_ATTR_PAD) ||
2660 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2661 sum.InPktsBadTag,
2662 MACSEC_SECY_STATS_ATTR_PAD) ||
2663 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2664 sum.InPktsUnknownSCI,
2665 MACSEC_SECY_STATS_ATTR_PAD) ||
2666 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2667 sum.InPktsNoSCI,
2668 MACSEC_SECY_STATS_ATTR_PAD) ||
2669 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2670 sum.InPktsOverrun,
2671 MACSEC_SECY_STATS_ATTR_PAD))
2672 return -EMSGSIZE;
2673
2674 return 0;
2675 }
2676
2677 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2678 {
2679 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2680 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
2681 MACSEC_ATTR_SECY);
2682 u64 csid;
2683
2684 if (!secy_nest)
2685 return 1;
2686
2687 switch (secy->key_len) {
2688 case MACSEC_GCM_AES_128_SAK_LEN:
2689 csid = MACSEC_DEFAULT_CIPHER_ID;
2690 break;
2691 case MACSEC_GCM_AES_256_SAK_LEN:
2692 csid = MACSEC_CIPHER_ID_GCM_AES_256;
2693 break;
2694 default:
2695 goto cancel;
2696 }
2697
2698 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2699 MACSEC_SECY_ATTR_PAD) ||
2700 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2701 csid, MACSEC_SECY_ATTR_PAD) ||
2702 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2703 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2704 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2705 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2706 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2707 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2708 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2709 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2710 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2711 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2712 goto cancel;
2713
2714 if (secy->replay_protect) {
2715 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2716 goto cancel;
2717 }
2718
2719 nla_nest_end(skb, secy_nest);
2720 return 0;
2721
2722 cancel:
2723 nla_nest_cancel(skb, secy_nest);
2724 return 1;
2725 }
2726
2727 static noinline_for_stack int
2728 dump_secy(struct macsec_secy *secy, struct net_device *dev,
2729 struct sk_buff *skb, struct netlink_callback *cb)
2730 {
2731 struct macsec_dev *macsec = netdev_priv(dev);
2732 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2733 struct nlattr *txsa_list, *rxsc_list;
2734 struct macsec_rx_sc *rx_sc;
2735 struct nlattr *attr;
2736 void *hdr;
2737 int i, j;
2738
2739 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2740 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2741 if (!hdr)
2742 return -EMSGSIZE;
2743
2744 genl_dump_check_consistent(cb, hdr);
2745
2746 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2747 goto nla_put_failure;
2748
2749 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
2750 if (!attr)
2751 goto nla_put_failure;
2752 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
2753 goto nla_put_failure;
2754 nla_nest_end(skb, attr);
2755
2756 if (nla_put_secy(secy, skb))
2757 goto nla_put_failure;
2758
2759 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
2760 if (!attr)
2761 goto nla_put_failure;
2762 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2763 nla_nest_cancel(skb, attr);
2764 goto nla_put_failure;
2765 }
2766 nla_nest_end(skb, attr);
2767
2768 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
2769 if (!attr)
2770 goto nla_put_failure;
2771 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2772 nla_nest_cancel(skb, attr);
2773 goto nla_put_failure;
2774 }
2775 nla_nest_end(skb, attr);
2776
2777 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
2778 if (!txsa_list)
2779 goto nla_put_failure;
2780 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2781 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2782 struct nlattr *txsa_nest;
2783
2784 if (!tx_sa)
2785 continue;
2786
2787 txsa_nest = nla_nest_start_noflag(skb, j++);
2788 if (!txsa_nest) {
2789 nla_nest_cancel(skb, txsa_list);
2790 goto nla_put_failure;
2791 }
2792
2793 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2794 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2795 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2796 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2797 nla_nest_cancel(skb, txsa_nest);
2798 nla_nest_cancel(skb, txsa_list);
2799 goto nla_put_failure;
2800 }
2801
2802 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
2803 if (!attr) {
2804 nla_nest_cancel(skb, txsa_nest);
2805 nla_nest_cancel(skb, txsa_list);
2806 goto nla_put_failure;
2807 }
2808 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2809 nla_nest_cancel(skb, attr);
2810 nla_nest_cancel(skb, txsa_nest);
2811 nla_nest_cancel(skb, txsa_list);
2812 goto nla_put_failure;
2813 }
2814 nla_nest_end(skb, attr);
2815
2816 nla_nest_end(skb, txsa_nest);
2817 }
2818 nla_nest_end(skb, txsa_list);
2819
2820 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
2821 if (!rxsc_list)
2822 goto nla_put_failure;
2823
2824 j = 1;
2825 for_each_rxsc_rtnl(secy, rx_sc) {
2826 int k;
2827 struct nlattr *rxsa_list;
2828 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
2829
2830 if (!rxsc_nest) {
2831 nla_nest_cancel(skb, rxsc_list);
2832 goto nla_put_failure;
2833 }
2834
2835 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2836 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
2837 MACSEC_RXSC_ATTR_PAD)) {
2838 nla_nest_cancel(skb, rxsc_nest);
2839 nla_nest_cancel(skb, rxsc_list);
2840 goto nla_put_failure;
2841 }
2842
2843 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
2844 if (!attr) {
2845 nla_nest_cancel(skb, rxsc_nest);
2846 nla_nest_cancel(skb, rxsc_list);
2847 goto nla_put_failure;
2848 }
2849 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2850 nla_nest_cancel(skb, attr);
2851 nla_nest_cancel(skb, rxsc_nest);
2852 nla_nest_cancel(skb, rxsc_list);
2853 goto nla_put_failure;
2854 }
2855 nla_nest_end(skb, attr);
2856
2857 rxsa_list = nla_nest_start_noflag(skb,
2858 MACSEC_RXSC_ATTR_SA_LIST);
2859 if (!rxsa_list) {
2860 nla_nest_cancel(skb, rxsc_nest);
2861 nla_nest_cancel(skb, rxsc_list);
2862 goto nla_put_failure;
2863 }
2864
2865 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2866 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2867 struct nlattr *rxsa_nest;
2868
2869 if (!rx_sa)
2870 continue;
2871
2872 rxsa_nest = nla_nest_start_noflag(skb, k++);
2873 if (!rxsa_nest) {
2874 nla_nest_cancel(skb, rxsa_list);
2875 nla_nest_cancel(skb, rxsc_nest);
2876 nla_nest_cancel(skb, rxsc_list);
2877 goto nla_put_failure;
2878 }
2879
2880 attr = nla_nest_start_noflag(skb,
2881 MACSEC_SA_ATTR_STATS);
2882 if (!attr) {
2883 nla_nest_cancel(skb, rxsa_list);
2884 nla_nest_cancel(skb, rxsc_nest);
2885 nla_nest_cancel(skb, rxsc_list);
2886 goto nla_put_failure;
2887 }
2888 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2889 nla_nest_cancel(skb, attr);
2890 nla_nest_cancel(skb, rxsa_list);
2891 nla_nest_cancel(skb, rxsc_nest);
2892 nla_nest_cancel(skb, rxsc_list);
2893 goto nla_put_failure;
2894 }
2895 nla_nest_end(skb, attr);
2896
2897 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2898 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2899 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2900 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2901 nla_nest_cancel(skb, rxsa_nest);
2902 nla_nest_cancel(skb, rxsc_nest);
2903 nla_nest_cancel(skb, rxsc_list);
2904 goto nla_put_failure;
2905 }
2906 nla_nest_end(skb, rxsa_nest);
2907 }
2908
2909 nla_nest_end(skb, rxsa_list);
2910 nla_nest_end(skb, rxsc_nest);
2911 }
2912
2913 nla_nest_end(skb, rxsc_list);
2914
2915 genlmsg_end(skb, hdr);
2916
2917 return 0;
2918
2919 nla_put_failure:
2920 genlmsg_cancel(skb, hdr);
2921 return -EMSGSIZE;
2922 }
2923
2924 static int macsec_generation = 1; /* protected by RTNL */
2925
2926 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2927 {
2928 struct net *net = sock_net(skb->sk);
2929 struct net_device *dev;
2930 int dev_idx, d;
2931
2932 dev_idx = cb->args[0];
2933
2934 d = 0;
2935 rtnl_lock();
2936
2937 cb->seq = macsec_generation;
2938
2939 for_each_netdev(net, dev) {
2940 struct macsec_secy *secy;
2941
2942 if (d < dev_idx)
2943 goto next;
2944
2945 if (!netif_is_macsec(dev))
2946 goto next;
2947
2948 secy = &macsec_priv(dev)->secy;
2949 if (dump_secy(secy, dev, skb, cb) < 0)
2950 goto done;
2951 next:
2952 d++;
2953 }
2954
2955 done:
2956 rtnl_unlock();
2957 cb->args[0] = d;
2958 return skb->len;
2959 }
2960
2961 static const struct genl_ops macsec_genl_ops[] = {
2962 {
2963 .cmd = MACSEC_CMD_GET_TXSC,
2964 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2965 .dumpit = macsec_dump_txsc,
2966 },
2967 {
2968 .cmd = MACSEC_CMD_ADD_RXSC,
2969 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2970 .doit = macsec_add_rxsc,
2971 .flags = GENL_ADMIN_PERM,
2972 },
2973 {
2974 .cmd = MACSEC_CMD_DEL_RXSC,
2975 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2976 .doit = macsec_del_rxsc,
2977 .flags = GENL_ADMIN_PERM,
2978 },
2979 {
2980 .cmd = MACSEC_CMD_UPD_RXSC,
2981 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2982 .doit = macsec_upd_rxsc,
2983 .flags = GENL_ADMIN_PERM,
2984 },
2985 {
2986 .cmd = MACSEC_CMD_ADD_TXSA,
2987 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2988 .doit = macsec_add_txsa,
2989 .flags = GENL_ADMIN_PERM,
2990 },
2991 {
2992 .cmd = MACSEC_CMD_DEL_TXSA,
2993 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2994 .doit = macsec_del_txsa,
2995 .flags = GENL_ADMIN_PERM,
2996 },
2997 {
2998 .cmd = MACSEC_CMD_UPD_TXSA,
2999 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3000 .doit = macsec_upd_txsa,
3001 .flags = GENL_ADMIN_PERM,
3002 },
3003 {
3004 .cmd = MACSEC_CMD_ADD_RXSA,
3005 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3006 .doit = macsec_add_rxsa,
3007 .flags = GENL_ADMIN_PERM,
3008 },
3009 {
3010 .cmd = MACSEC_CMD_DEL_RXSA,
3011 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3012 .doit = macsec_del_rxsa,
3013 .flags = GENL_ADMIN_PERM,
3014 },
3015 {
3016 .cmd = MACSEC_CMD_UPD_RXSA,
3017 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3018 .doit = macsec_upd_rxsa,
3019 .flags = GENL_ADMIN_PERM,
3020 },
3021 {
3022 .cmd = MACSEC_CMD_UPD_OFFLOAD,
3023 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3024 .doit = macsec_upd_offload,
3025 .flags = GENL_ADMIN_PERM,
3026 },
3027 };
3028
3029 static struct genl_family macsec_fam __ro_after_init = {
3030 .name = MACSEC_GENL_NAME,
3031 .hdrsize = 0,
3032 .version = MACSEC_GENL_VERSION,
3033 .maxattr = MACSEC_ATTR_MAX,
3034 .policy = macsec_genl_policy,
3035 .netnsok = true,
3036 .module = THIS_MODULE,
3037 .ops = macsec_genl_ops,
3038 .n_ops = ARRAY_SIZE(macsec_genl_ops),
3039 };
3040
3041 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3042 struct net_device *dev)
3043 {
3044 struct macsec_dev *macsec = netdev_priv(dev);
3045 struct macsec_secy *secy = &macsec->secy;
3046 struct pcpu_secy_stats *secy_stats;
3047 int ret, len;
3048
3049 if (macsec_is_offloaded(netdev_priv(dev))) {
3050 skb->dev = macsec->real_dev;
3051 return dev_queue_xmit(skb);
3052 }
3053
3054 /* 10.5 */
3055 if (!secy->protect_frames) {
3056 secy_stats = this_cpu_ptr(macsec->stats);
3057 u64_stats_update_begin(&secy_stats->syncp);
3058 secy_stats->stats.OutPktsUntagged++;
3059 u64_stats_update_end(&secy_stats->syncp);
3060 skb->dev = macsec->real_dev;
3061 len = skb->len;
3062 ret = dev_queue_xmit(skb);
3063 count_tx(dev, ret, len);
3064 return ret;
3065 }
3066
3067 if (!secy->operational) {
3068 kfree_skb(skb);
3069 dev->stats.tx_dropped++;
3070 return NETDEV_TX_OK;
3071 }
3072
3073 skb = macsec_encrypt(skb, dev);
3074 if (IS_ERR(skb)) {
3075 if (PTR_ERR(skb) != -EINPROGRESS)
3076 dev->stats.tx_dropped++;
3077 return NETDEV_TX_OK;
3078 }
3079
3080 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3081
3082 macsec_encrypt_finish(skb, dev);
3083 len = skb->len;
3084 ret = dev_queue_xmit(skb);
3085 count_tx(dev, ret, len);
3086 return ret;
3087 }
3088
3089 #define MACSEC_FEATURES \
3090 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3091
3092 static int macsec_dev_init(struct net_device *dev)
3093 {
3094 struct macsec_dev *macsec = macsec_priv(dev);
3095 struct net_device *real_dev = macsec->real_dev;
3096 int err;
3097
3098 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3099 if (!dev->tstats)
3100 return -ENOMEM;
3101
3102 err = gro_cells_init(&macsec->gro_cells, dev);
3103 if (err) {
3104 free_percpu(dev->tstats);
3105 return err;
3106 }
3107
3108 dev->features = real_dev->features & MACSEC_FEATURES;
3109 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
3110
3111 dev->needed_headroom = real_dev->needed_headroom +
3112 MACSEC_NEEDED_HEADROOM;
3113 dev->needed_tailroom = real_dev->needed_tailroom +
3114 MACSEC_NEEDED_TAILROOM;
3115
3116 if (is_zero_ether_addr(dev->dev_addr))
3117 eth_hw_addr_inherit(dev, real_dev);
3118 if (is_zero_ether_addr(dev->broadcast))
3119 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3120
3121 return 0;
3122 }
3123
3124 static void macsec_dev_uninit(struct net_device *dev)
3125 {
3126 struct macsec_dev *macsec = macsec_priv(dev);
3127
3128 gro_cells_destroy(&macsec->gro_cells);
3129 free_percpu(dev->tstats);
3130 }
3131
3132 static netdev_features_t macsec_fix_features(struct net_device *dev,
3133 netdev_features_t features)
3134 {
3135 struct macsec_dev *macsec = macsec_priv(dev);
3136 struct net_device *real_dev = macsec->real_dev;
3137
3138 features &= (real_dev->features & MACSEC_FEATURES) |
3139 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3140 features |= NETIF_F_LLTX;
3141
3142 return features;
3143 }
3144
3145 static int macsec_dev_open(struct net_device *dev)
3146 {
3147 struct macsec_dev *macsec = macsec_priv(dev);
3148 struct net_device *real_dev = macsec->real_dev;
3149 int err;
3150
3151 err = dev_uc_add(real_dev, dev->dev_addr);
3152 if (err < 0)
3153 return err;
3154
3155 if (dev->flags & IFF_ALLMULTI) {
3156 err = dev_set_allmulti(real_dev, 1);
3157 if (err < 0)
3158 goto del_unicast;
3159 }
3160
3161 if (dev->flags & IFF_PROMISC) {
3162 err = dev_set_promiscuity(real_dev, 1);
3163 if (err < 0)
3164 goto clear_allmulti;
3165 }
3166
3167 /* If h/w offloading is available, propagate to the device */
3168 if (macsec_is_offloaded(macsec)) {
3169 const struct macsec_ops *ops;
3170 struct macsec_context ctx;
3171
3172 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3173 if (!ops) {
3174 err = -EOPNOTSUPP;
3175 goto clear_allmulti;
3176 }
3177
3178 err = macsec_offload(ops->mdo_dev_open, &ctx);
3179 if (err)
3180 goto clear_allmulti;
3181 }
3182
3183 if (netif_carrier_ok(real_dev))
3184 netif_carrier_on(dev);
3185
3186 return 0;
3187 clear_allmulti:
3188 if (dev->flags & IFF_ALLMULTI)
3189 dev_set_allmulti(real_dev, -1);
3190 del_unicast:
3191 dev_uc_del(real_dev, dev->dev_addr);
3192 netif_carrier_off(dev);
3193 return err;
3194 }
3195
3196 static int macsec_dev_stop(struct net_device *dev)
3197 {
3198 struct macsec_dev *macsec = macsec_priv(dev);
3199 struct net_device *real_dev = macsec->real_dev;
3200
3201 netif_carrier_off(dev);
3202
3203 /* If h/w offloading is available, propagate to the device */
3204 if (macsec_is_offloaded(macsec)) {
3205 const struct macsec_ops *ops;
3206 struct macsec_context ctx;
3207
3208 ops = macsec_get_ops(macsec, &ctx);
3209 if (ops)
3210 macsec_offload(ops->mdo_dev_stop, &ctx);
3211 }
3212
3213 dev_mc_unsync(real_dev, dev);
3214 dev_uc_unsync(real_dev, dev);
3215
3216 if (dev->flags & IFF_ALLMULTI)
3217 dev_set_allmulti(real_dev, -1);
3218
3219 if (dev->flags & IFF_PROMISC)
3220 dev_set_promiscuity(real_dev, -1);
3221
3222 dev_uc_del(real_dev, dev->dev_addr);
3223
3224 return 0;
3225 }
3226
3227 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3228 {
3229 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3230
3231 if (!(dev->flags & IFF_UP))
3232 return;
3233
3234 if (change & IFF_ALLMULTI)
3235 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3236
3237 if (change & IFF_PROMISC)
3238 dev_set_promiscuity(real_dev,
3239 dev->flags & IFF_PROMISC ? 1 : -1);
3240 }
3241
3242 static void macsec_dev_set_rx_mode(struct net_device *dev)
3243 {
3244 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3245
3246 dev_mc_sync(real_dev, dev);
3247 dev_uc_sync(real_dev, dev);
3248 }
3249
3250 static int macsec_set_mac_address(struct net_device *dev, void *p)
3251 {
3252 struct macsec_dev *macsec = macsec_priv(dev);
3253 struct net_device *real_dev = macsec->real_dev;
3254 struct sockaddr *addr = p;
3255 int err;
3256
3257 if (!is_valid_ether_addr(addr->sa_data))
3258 return -EADDRNOTAVAIL;
3259
3260 if (!(dev->flags & IFF_UP))
3261 goto out;
3262
3263 err = dev_uc_add(real_dev, addr->sa_data);
3264 if (err < 0)
3265 return err;
3266
3267 dev_uc_del(real_dev, dev->dev_addr);
3268
3269 out:
3270 ether_addr_copy(dev->dev_addr, addr->sa_data);
3271 return 0;
3272 }
3273
3274 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3275 {
3276 struct macsec_dev *macsec = macsec_priv(dev);
3277 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3278
3279 if (macsec->real_dev->mtu - extra < new_mtu)
3280 return -ERANGE;
3281
3282 dev->mtu = new_mtu;
3283
3284 return 0;
3285 }
3286
3287 static void macsec_get_stats64(struct net_device *dev,
3288 struct rtnl_link_stats64 *s)
3289 {
3290 int cpu;
3291
3292 if (!dev->tstats)
3293 return;
3294
3295 for_each_possible_cpu(cpu) {
3296 struct pcpu_sw_netstats *stats;
3297 struct pcpu_sw_netstats tmp;
3298 int start;
3299
3300 stats = per_cpu_ptr(dev->tstats, cpu);
3301 do {
3302 start = u64_stats_fetch_begin_irq(&stats->syncp);
3303 tmp.rx_packets = stats->rx_packets;
3304 tmp.rx_bytes = stats->rx_bytes;
3305 tmp.tx_packets = stats->tx_packets;
3306 tmp.tx_bytes = stats->tx_bytes;
3307 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
3308
3309 s->rx_packets += tmp.rx_packets;
3310 s->rx_bytes += tmp.rx_bytes;
3311 s->tx_packets += tmp.tx_packets;
3312 s->tx_bytes += tmp.tx_bytes;
3313 }
3314
3315 s->rx_dropped = dev->stats.rx_dropped;
3316 s->tx_dropped = dev->stats.tx_dropped;
3317 }
3318
3319 static int macsec_get_iflink(const struct net_device *dev)
3320 {
3321 return macsec_priv(dev)->real_dev->ifindex;
3322 }
3323
3324 static const struct net_device_ops macsec_netdev_ops = {
3325 .ndo_init = macsec_dev_init,
3326 .ndo_uninit = macsec_dev_uninit,
3327 .ndo_open = macsec_dev_open,
3328 .ndo_stop = macsec_dev_stop,
3329 .ndo_fix_features = macsec_fix_features,
3330 .ndo_change_mtu = macsec_change_mtu,
3331 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
3332 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
3333 .ndo_set_mac_address = macsec_set_mac_address,
3334 .ndo_start_xmit = macsec_start_xmit,
3335 .ndo_get_stats64 = macsec_get_stats64,
3336 .ndo_get_iflink = macsec_get_iflink,
3337 };
3338
3339 static const struct device_type macsec_type = {
3340 .name = "macsec",
3341 };
3342
3343 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3344 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3345 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3346 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3347 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3348 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3349 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3350 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3351 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3352 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3353 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3354 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3355 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3356 };
3357
3358 static void macsec_free_netdev(struct net_device *dev)
3359 {
3360 struct macsec_dev *macsec = macsec_priv(dev);
3361
3362 free_percpu(macsec->stats);
3363 free_percpu(macsec->secy.tx_sc.stats);
3364
3365 }
3366
3367 static void macsec_setup(struct net_device *dev)
3368 {
3369 ether_setup(dev);
3370 dev->min_mtu = 0;
3371 dev->max_mtu = ETH_MAX_MTU;
3372 dev->priv_flags |= IFF_NO_QUEUE;
3373 dev->netdev_ops = &macsec_netdev_ops;
3374 dev->needs_free_netdev = true;
3375 dev->priv_destructor = macsec_free_netdev;
3376 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3377
3378 eth_zero_addr(dev->broadcast);
3379 }
3380
3381 static int macsec_changelink_common(struct net_device *dev,
3382 struct nlattr *data[])
3383 {
3384 struct macsec_secy *secy;
3385 struct macsec_tx_sc *tx_sc;
3386
3387 secy = &macsec_priv(dev)->secy;
3388 tx_sc = &secy->tx_sc;
3389
3390 if (data[IFLA_MACSEC_ENCODING_SA]) {
3391 struct macsec_tx_sa *tx_sa;
3392
3393 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3394 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3395
3396 secy->operational = tx_sa && tx_sa->active;
3397 }
3398
3399 if (data[IFLA_MACSEC_WINDOW])
3400 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3401
3402 if (data[IFLA_MACSEC_ENCRYPT])
3403 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3404
3405 if (data[IFLA_MACSEC_PROTECT])
3406 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3407
3408 if (data[IFLA_MACSEC_INC_SCI])
3409 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3410
3411 if (data[IFLA_MACSEC_ES])
3412 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3413
3414 if (data[IFLA_MACSEC_SCB])
3415 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3416
3417 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3418 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3419
3420 if (data[IFLA_MACSEC_VALIDATION])
3421 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3422
3423 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3424 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3425 case MACSEC_CIPHER_ID_GCM_AES_128:
3426 case MACSEC_DEFAULT_CIPHER_ID:
3427 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3428 break;
3429 case MACSEC_CIPHER_ID_GCM_AES_256:
3430 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3431 break;
3432 default:
3433 return -EINVAL;
3434 }
3435 }
3436
3437 return 0;
3438 }
3439
3440 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3441 struct nlattr *data[],
3442 struct netlink_ext_ack *extack)
3443 {
3444 struct macsec_dev *macsec = macsec_priv(dev);
3445 struct macsec_tx_sa tx_sc;
3446 struct macsec_secy secy;
3447 int ret;
3448
3449 if (!data)
3450 return 0;
3451
3452 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3453 data[IFLA_MACSEC_ICV_LEN] ||
3454 data[IFLA_MACSEC_SCI] ||
3455 data[IFLA_MACSEC_PORT])
3456 return -EINVAL;
3457
3458 /* Keep a copy of unmodified secy and tx_sc, in case the offload
3459 * propagation fails, to revert macsec_changelink_common.
3460 */
3461 memcpy(&secy, &macsec->secy, sizeof(secy));
3462 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3463
3464 ret = macsec_changelink_common(dev, data);
3465 if (ret)
3466 return ret;
3467
3468 /* If h/w offloading is available, propagate to the device */
3469 if (macsec_is_offloaded(macsec)) {
3470 const struct macsec_ops *ops;
3471 struct macsec_context ctx;
3472 int ret;
3473
3474 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3475 if (!ops) {
3476 ret = -EOPNOTSUPP;
3477 goto cleanup;
3478 }
3479
3480 ctx.secy = &macsec->secy;
3481 ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3482 if (ret)
3483 goto cleanup;
3484 }
3485
3486 return 0;
3487
3488 cleanup:
3489 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3490 memcpy(&macsec->secy, &secy, sizeof(secy));
3491
3492 return ret;
3493 }
3494
3495 static void macsec_del_dev(struct macsec_dev *macsec)
3496 {
3497 int i;
3498
3499 while (macsec->secy.rx_sc) {
3500 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3501
3502 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3503 free_rx_sc(rx_sc);
3504 }
3505
3506 for (i = 0; i < MACSEC_NUM_AN; i++) {
3507 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3508
3509 if (sa) {
3510 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3511 clear_tx_sa(sa);
3512 }
3513 }
3514 }
3515
3516 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3517 {
3518 struct macsec_dev *macsec = macsec_priv(dev);
3519 struct net_device *real_dev = macsec->real_dev;
3520
3521 unregister_netdevice_queue(dev, head);
3522 list_del_rcu(&macsec->secys);
3523 macsec_del_dev(macsec);
3524 netdev_upper_dev_unlink(real_dev, dev);
3525
3526 macsec_generation++;
3527 }
3528
3529 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3530 {
3531 struct macsec_dev *macsec = macsec_priv(dev);
3532 struct net_device *real_dev = macsec->real_dev;
3533 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3534
3535 /* If h/w offloading is available, propagate to the device */
3536 if (macsec_is_offloaded(macsec)) {
3537 const struct macsec_ops *ops;
3538 struct macsec_context ctx;
3539
3540 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3541 if (ops) {
3542 ctx.secy = &macsec->secy;
3543 macsec_offload(ops->mdo_del_secy, &ctx);
3544 }
3545 }
3546
3547 macsec_common_dellink(dev, head);
3548
3549 if (list_empty(&rxd->secys)) {
3550 netdev_rx_handler_unregister(real_dev);
3551 kfree(rxd);
3552 }
3553 }
3554
3555 static int register_macsec_dev(struct net_device *real_dev,
3556 struct net_device *dev)
3557 {
3558 struct macsec_dev *macsec = macsec_priv(dev);
3559 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3560
3561 if (!rxd) {
3562 int err;
3563
3564 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3565 if (!rxd)
3566 return -ENOMEM;
3567
3568 INIT_LIST_HEAD(&rxd->secys);
3569
3570 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3571 rxd);
3572 if (err < 0) {
3573 kfree(rxd);
3574 return err;
3575 }
3576 }
3577
3578 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3579 return 0;
3580 }
3581
3582 static bool sci_exists(struct net_device *dev, sci_t sci)
3583 {
3584 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3585 struct macsec_dev *macsec;
3586
3587 list_for_each_entry(macsec, &rxd->secys, secys) {
3588 if (macsec->secy.sci == sci)
3589 return true;
3590 }
3591
3592 return false;
3593 }
3594
3595 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3596 {
3597 return make_sci(dev->dev_addr, port);
3598 }
3599
3600 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3601 {
3602 struct macsec_dev *macsec = macsec_priv(dev);
3603 struct macsec_secy *secy = &macsec->secy;
3604
3605 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3606 if (!macsec->stats)
3607 return -ENOMEM;
3608
3609 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3610 if (!secy->tx_sc.stats) {
3611 free_percpu(macsec->stats);
3612 return -ENOMEM;
3613 }
3614
3615 if (sci == MACSEC_UNDEF_SCI)
3616 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3617
3618 secy->netdev = dev;
3619 secy->operational = true;
3620 secy->key_len = DEFAULT_SAK_LEN;
3621 secy->icv_len = icv_len;
3622 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3623 secy->protect_frames = true;
3624 secy->replay_protect = false;
3625
3626 secy->sci = sci;
3627 secy->tx_sc.active = true;
3628 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3629 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3630 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3631 secy->tx_sc.end_station = false;
3632 secy->tx_sc.scb = false;
3633
3634 return 0;
3635 }
3636
3637 static int macsec_newlink(struct net *net, struct net_device *dev,
3638 struct nlattr *tb[], struct nlattr *data[],
3639 struct netlink_ext_ack *extack)
3640 {
3641 struct macsec_dev *macsec = macsec_priv(dev);
3642 struct net_device *real_dev;
3643 int err;
3644 sci_t sci;
3645 u8 icv_len = DEFAULT_ICV_LEN;
3646 rx_handler_func_t *rx_handler;
3647
3648 if (!tb[IFLA_LINK])
3649 return -EINVAL;
3650 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3651 if (!real_dev)
3652 return -ENODEV;
3653
3654 dev->priv_flags |= IFF_MACSEC;
3655
3656 macsec->real_dev = real_dev;
3657
3658 /* MACsec offloading is off by default */
3659 macsec->offload = MACSEC_OFFLOAD_OFF;
3660
3661 if (data && data[IFLA_MACSEC_ICV_LEN])
3662 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3663 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3664
3665 rx_handler = rtnl_dereference(real_dev->rx_handler);
3666 if (rx_handler && rx_handler != macsec_handle_frame)
3667 return -EBUSY;
3668
3669 err = register_netdevice(dev);
3670 if (err < 0)
3671 return err;
3672
3673 err = netdev_upper_dev_link(real_dev, dev, extack);
3674 if (err < 0)
3675 goto unregister;
3676
3677 /* need to be already registered so that ->init has run and
3678 * the MAC addr is set
3679 */
3680 if (data && data[IFLA_MACSEC_SCI])
3681 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3682 else if (data && data[IFLA_MACSEC_PORT])
3683 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3684 else
3685 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3686
3687 if (rx_handler && sci_exists(real_dev, sci)) {
3688 err = -EBUSY;
3689 goto unlink;
3690 }
3691
3692 err = macsec_add_dev(dev, sci, icv_len);
3693 if (err)
3694 goto unlink;
3695
3696 if (data) {
3697 err = macsec_changelink_common(dev, data);
3698 if (err)
3699 goto del_dev;
3700 }
3701
3702 err = register_macsec_dev(real_dev, dev);
3703 if (err < 0)
3704 goto del_dev;
3705
3706 netif_stacked_transfer_operstate(real_dev, dev);
3707 linkwatch_fire_event(dev);
3708
3709 macsec_generation++;
3710
3711 return 0;
3712
3713 del_dev:
3714 macsec_del_dev(macsec);
3715 unlink:
3716 netdev_upper_dev_unlink(real_dev, dev);
3717 unregister:
3718 unregister_netdevice(dev);
3719 return err;
3720 }
3721
3722 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
3723 struct netlink_ext_ack *extack)
3724 {
3725 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3726 u8 icv_len = DEFAULT_ICV_LEN;
3727 int flag;
3728 bool es, scb, sci;
3729
3730 if (!data)
3731 return 0;
3732
3733 if (data[IFLA_MACSEC_CIPHER_SUITE])
3734 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3735
3736 if (data[IFLA_MACSEC_ICV_LEN]) {
3737 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3738 if (icv_len != DEFAULT_ICV_LEN) {
3739 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
3740 struct crypto_aead *dummy_tfm;
3741
3742 dummy_tfm = macsec_alloc_tfm(dummy_key,
3743 DEFAULT_SAK_LEN,
3744 icv_len);
3745 if (IS_ERR(dummy_tfm))
3746 return PTR_ERR(dummy_tfm);
3747 crypto_free_aead(dummy_tfm);
3748 }
3749 }
3750
3751 switch (csid) {
3752 case MACSEC_CIPHER_ID_GCM_AES_128:
3753 case MACSEC_CIPHER_ID_GCM_AES_256:
3754 case MACSEC_DEFAULT_CIPHER_ID:
3755 if (icv_len < MACSEC_MIN_ICV_LEN ||
3756 icv_len > MACSEC_STD_ICV_LEN)
3757 return -EINVAL;
3758 break;
3759 default:
3760 return -EINVAL;
3761 }
3762
3763 if (data[IFLA_MACSEC_ENCODING_SA]) {
3764 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3765 return -EINVAL;
3766 }
3767
3768 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3769 flag < IFLA_MACSEC_VALIDATION;
3770 flag++) {
3771 if (data[flag]) {
3772 if (nla_get_u8(data[flag]) > 1)
3773 return -EINVAL;
3774 }
3775 }
3776
3777 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3778 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3779 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3780
3781 if ((sci && (scb || es)) || (scb && es))
3782 return -EINVAL;
3783
3784 if (data[IFLA_MACSEC_VALIDATION] &&
3785 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3786 return -EINVAL;
3787
3788 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3789 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3790 !data[IFLA_MACSEC_WINDOW])
3791 return -EINVAL;
3792
3793 return 0;
3794 }
3795
3796 static struct net *macsec_get_link_net(const struct net_device *dev)
3797 {
3798 return dev_net(macsec_priv(dev)->real_dev);
3799 }
3800
3801 static size_t macsec_get_size(const struct net_device *dev)
3802 {
3803 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
3804 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
3805 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
3806 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
3807 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
3808 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
3809 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
3810 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
3811 nla_total_size(1) + /* IFLA_MACSEC_ES */
3812 nla_total_size(1) + /* IFLA_MACSEC_SCB */
3813 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
3814 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
3815 0;
3816 }
3817
3818 static int macsec_fill_info(struct sk_buff *skb,
3819 const struct net_device *dev)
3820 {
3821 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3822 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3823 u64 csid;
3824
3825 switch (secy->key_len) {
3826 case MACSEC_GCM_AES_128_SAK_LEN:
3827 csid = MACSEC_DEFAULT_CIPHER_ID;
3828 break;
3829 case MACSEC_GCM_AES_256_SAK_LEN:
3830 csid = MACSEC_CIPHER_ID_GCM_AES_256;
3831 break;
3832 default:
3833 goto nla_put_failure;
3834 }
3835
3836 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
3837 IFLA_MACSEC_PAD) ||
3838 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3839 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
3840 csid, IFLA_MACSEC_PAD) ||
3841 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3842 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3843 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3844 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3845 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3846 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3847 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3848 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3849 0)
3850 goto nla_put_failure;
3851
3852 if (secy->replay_protect) {
3853 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3854 goto nla_put_failure;
3855 }
3856
3857 return 0;
3858
3859 nla_put_failure:
3860 return -EMSGSIZE;
3861 }
3862
3863 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3864 .kind = "macsec",
3865 .priv_size = sizeof(struct macsec_dev),
3866 .maxtype = IFLA_MACSEC_MAX,
3867 .policy = macsec_rtnl_policy,
3868 .setup = macsec_setup,
3869 .validate = macsec_validate_attr,
3870 .newlink = macsec_newlink,
3871 .changelink = macsec_changelink,
3872 .dellink = macsec_dellink,
3873 .get_size = macsec_get_size,
3874 .fill_info = macsec_fill_info,
3875 .get_link_net = macsec_get_link_net,
3876 };
3877
3878 static bool is_macsec_master(struct net_device *dev)
3879 {
3880 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3881 }
3882
3883 static int macsec_notify(struct notifier_block *this, unsigned long event,
3884 void *ptr)
3885 {
3886 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3887 LIST_HEAD(head);
3888
3889 if (!is_macsec_master(real_dev))
3890 return NOTIFY_DONE;
3891
3892 switch (event) {
3893 case NETDEV_DOWN:
3894 case NETDEV_UP:
3895 case NETDEV_CHANGE: {
3896 struct macsec_dev *m, *n;
3897 struct macsec_rxh_data *rxd;
3898
3899 rxd = macsec_data_rtnl(real_dev);
3900 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3901 struct net_device *dev = m->secy.netdev;
3902
3903 netif_stacked_transfer_operstate(real_dev, dev);
3904 }
3905 break;
3906 }
3907 case NETDEV_UNREGISTER: {
3908 struct macsec_dev *m, *n;
3909 struct macsec_rxh_data *rxd;
3910
3911 rxd = macsec_data_rtnl(real_dev);
3912 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3913 macsec_common_dellink(m->secy.netdev, &head);
3914 }
3915
3916 netdev_rx_handler_unregister(real_dev);
3917 kfree(rxd);
3918
3919 unregister_netdevice_many(&head);
3920 break;
3921 }
3922 case NETDEV_CHANGEMTU: {
3923 struct macsec_dev *m;
3924 struct macsec_rxh_data *rxd;
3925
3926 rxd = macsec_data_rtnl(real_dev);
3927 list_for_each_entry(m, &rxd->secys, secys) {
3928 struct net_device *dev = m->secy.netdev;
3929 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3930 macsec_extra_len(true));
3931
3932 if (dev->mtu > mtu)
3933 dev_set_mtu(dev, mtu);
3934 }
3935 }
3936 }
3937
3938 return NOTIFY_OK;
3939 }
3940
3941 static struct notifier_block macsec_notifier = {
3942 .notifier_call = macsec_notify,
3943 };
3944
3945 static int __init macsec_init(void)
3946 {
3947 int err;
3948
3949 pr_info("MACsec IEEE 802.1AE\n");
3950 err = register_netdevice_notifier(&macsec_notifier);
3951 if (err)
3952 return err;
3953
3954 err = rtnl_link_register(&macsec_link_ops);
3955 if (err)
3956 goto notifier;
3957
3958 err = genl_register_family(&macsec_fam);
3959 if (err)
3960 goto rtnl;
3961
3962 return 0;
3963
3964 rtnl:
3965 rtnl_link_unregister(&macsec_link_ops);
3966 notifier:
3967 unregister_netdevice_notifier(&macsec_notifier);
3968 return err;
3969 }
3970
3971 static void __exit macsec_exit(void)
3972 {
3973 genl_unregister_family(&macsec_fam);
3974 rtnl_link_unregister(&macsec_link_ops);
3975 unregister_netdevice_notifier(&macsec_notifier);
3976 rcu_barrier();
3977 }
3978
3979 module_init(macsec_init);
3980 module_exit(macsec_exit);
3981
3982 MODULE_ALIAS_RTNL_LINK("macsec");
3983 MODULE_ALIAS_GENL_FAMILY("macsec");
3984
3985 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3986 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support