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 <net/dst_metadata.h>
22 #include <linux/phy.h>
23 #include <linux/byteorder/generic.h>
24 #include <linux/if_arp.h>
25
26 #include <uapi/linux/if_macsec.h>
27
28 /* SecTAG length = macsec_eth_header without the optional SCI */
29 #define MACSEC_TAG_LEN 6
30
31 struct macsec_eth_header {
32 struct ethhdr eth;
33 /* SecTAG */
34 u8 tci_an;
35 #if defined(__LITTLE_ENDIAN_BITFIELD)
36 u8 short_length:6,
37 unused:2;
38 #elif defined(__BIG_ENDIAN_BITFIELD)
39 u8 unused:2,
40 short_length:6;
41 #else
42 #error "Please fix <asm/byteorder.h>"
43 #endif
44 __be32 packet_number;
45 u8 secure_channel_id[8]; /* optional */
46 } __packed;
47
48 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
49 #define MIN_NON_SHORT_LEN 48
50
51 #define GCM_AES_IV_LEN 12
52
53 #define for_each_rxsc(secy, sc) \
54 for (sc = rcu_dereference_bh(secy->rx_sc); \
55 sc; \
56 sc = rcu_dereference_bh(sc->next))
57 #define for_each_rxsc_rtnl(secy, sc) \
58 for (sc = rtnl_dereference(secy->rx_sc); \
59 sc; \
60 sc = rtnl_dereference(sc->next))
61
62 #define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31)))
63
64 struct gcm_iv_xpn {
65 union {
66 u8 short_secure_channel_id[4];
67 ssci_t ssci;
68 };
69 __be64 pn;
70 } __packed;
71
72 struct gcm_iv {
73 union {
74 u8 secure_channel_id[8];
75 sci_t sci;
76 };
77 __be32 pn;
78 };
79
80 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
81
82 struct pcpu_secy_stats {
83 struct macsec_dev_stats stats;
84 struct u64_stats_sync syncp;
85 };
86
87 /**
88 * struct macsec_dev - private data
89 * @secy: SecY config
90 * @real_dev: pointer to underlying netdevice
91 * @dev_tracker: refcount tracker for @real_dev reference
92 * @stats: MACsec device stats
93 * @secys: linked list of SecY's on the underlying device
94 * @gro_cells: pointer to the Generic Receive Offload cell
95 * @offload: status of offloading on the MACsec device
96 */
97 struct macsec_dev {
98 struct macsec_secy secy;
99 struct net_device *real_dev;
100 netdevice_tracker dev_tracker;
101 struct pcpu_secy_stats __percpu *stats;
102 struct list_head secys;
103 struct gro_cells gro_cells;
104 enum macsec_offload offload;
105 };
106
107 /**
108 * struct macsec_rxh_data - rx_handler private argument
109 * @secys: linked list of SecY's on this underlying device
110 */
111 struct macsec_rxh_data {
112 struct list_head secys;
113 };
114
macsec_priv(const struct net_device * dev)115 static struct macsec_dev *macsec_priv(const struct net_device *dev)
116 {
117 return (struct macsec_dev *)netdev_priv(dev);
118 }
119
macsec_data_rcu(const struct net_device * dev)120 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
121 {
122 return rcu_dereference_bh(dev->rx_handler_data);
123 }
124
macsec_data_rtnl(const struct net_device * dev)125 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
126 {
127 return rtnl_dereference(dev->rx_handler_data);
128 }
129
130 struct macsec_cb {
131 struct aead_request *req;
132 union {
133 struct macsec_tx_sa *tx_sa;
134 struct macsec_rx_sa *rx_sa;
135 };
136 u8 assoc_num;
137 bool valid;
138 bool has_sci;
139 };
140
macsec_rxsa_get(struct macsec_rx_sa __rcu * ptr)141 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
142 {
143 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
144
145 if (!sa || !sa->active)
146 return NULL;
147
148 if (!refcount_inc_not_zero(&sa->refcnt))
149 return NULL;
150
151 return sa;
152 }
153
macsec_active_rxsa_get(struct macsec_rx_sc * rx_sc)154 static struct macsec_rx_sa *macsec_active_rxsa_get(struct macsec_rx_sc *rx_sc)
155 {
156 struct macsec_rx_sa *sa = NULL;
157 int an;
158
159 for (an = 0; an < MACSEC_NUM_AN; an++) {
160 sa = macsec_rxsa_get(rx_sc->sa[an]);
161 if (sa)
162 break;
163 }
164 return sa;
165 }
166
free_rx_sc_rcu(struct rcu_head * head)167 static void free_rx_sc_rcu(struct rcu_head *head)
168 {
169 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
170
171 free_percpu(rx_sc->stats);
172 kfree(rx_sc);
173 }
174
macsec_rxsc_get(struct macsec_rx_sc * sc)175 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
176 {
177 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
178 }
179
macsec_rxsc_put(struct macsec_rx_sc * sc)180 static void macsec_rxsc_put(struct macsec_rx_sc *sc)
181 {
182 if (refcount_dec_and_test(&sc->refcnt))
183 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
184 }
185
free_rxsa(struct rcu_head * head)186 static void free_rxsa(struct rcu_head *head)
187 {
188 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
189
190 crypto_free_aead(sa->key.tfm);
191 free_percpu(sa->stats);
192 kfree(sa);
193 }
194
macsec_rxsa_put(struct macsec_rx_sa * sa)195 static void macsec_rxsa_put(struct macsec_rx_sa *sa)
196 {
197 if (refcount_dec_and_test(&sa->refcnt))
198 call_rcu(&sa->rcu, free_rxsa);
199 }
200
macsec_txsa_get(struct macsec_tx_sa __rcu * ptr)201 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
202 {
203 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
204
205 if (!sa || !sa->active)
206 return NULL;
207
208 if (!refcount_inc_not_zero(&sa->refcnt))
209 return NULL;
210
211 return sa;
212 }
213
free_txsa(struct rcu_head * head)214 static void free_txsa(struct rcu_head *head)
215 {
216 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
217
218 crypto_free_aead(sa->key.tfm);
219 free_percpu(sa->stats);
220 kfree(sa);
221 }
222
macsec_txsa_put(struct macsec_tx_sa * sa)223 static void macsec_txsa_put(struct macsec_tx_sa *sa)
224 {
225 if (refcount_dec_and_test(&sa->refcnt))
226 call_rcu(&sa->rcu, free_txsa);
227 }
228
macsec_skb_cb(struct sk_buff * skb)229 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
230 {
231 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
232 return (struct macsec_cb *)skb->cb;
233 }
234
235 #define MACSEC_PORT_SCB (0x0000)
236 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
237 #define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
238
239 #define MACSEC_GCM_AES_128_SAK_LEN 16
240 #define MACSEC_GCM_AES_256_SAK_LEN 32
241
242 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
243 #define DEFAULT_XPN false
244 #define DEFAULT_SEND_SCI true
245 #define DEFAULT_ENCRYPT false
246 #define DEFAULT_ENCODING_SA 0
247 #define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1))
248
make_sci(const u8 * addr,__be16 port)249 static sci_t make_sci(const 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
macsec_frame_sci(struct macsec_eth_header * hdr,bool sci_present)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
macsec_sectag_len(bool sci_present)272 static unsigned int macsec_sectag_len(bool sci_present)
273 {
274 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
275 }
276
macsec_hdr_len(bool sci_present)277 static unsigned int macsec_hdr_len(bool sci_present)
278 {
279 return macsec_sectag_len(sci_present) + ETH_HLEN;
280 }
281
macsec_extra_len(bool sci_present)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 */
macsec_fill_sectag(struct macsec_eth_header * h,const struct macsec_secy * secy,u32 pn,bool sci_present)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 != MACSEC_DEFAULT_ICV_LEN)
314 h->tci_an |= MACSEC_TCI_C;
315
316 h->tci_an |= tx_sc->encoding_sa;
317 }
318
macsec_set_shortlen(struct macsec_eth_header * h,size_t data_len)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 */
macsec_is_offloaded(struct macsec_dev * macsec)326 static bool macsec_is_offloaded(struct macsec_dev *macsec)
327 {
328 if (macsec->offload == MACSEC_OFFLOAD_MAC ||
329 macsec->offload == MACSEC_OFFLOAD_PHY)
330 return true;
331
332 return false;
333 }
334
335 /* Checks if underlying layers implement MACsec offloading functions. */
macsec_check_offload(enum macsec_offload offload,struct macsec_dev * macsec)336 static bool macsec_check_offload(enum macsec_offload offload,
337 struct macsec_dev *macsec)
338 {
339 if (!macsec || !macsec->real_dev)
340 return false;
341
342 if (offload == MACSEC_OFFLOAD_PHY)
343 return macsec->real_dev->phydev &&
344 macsec->real_dev->phydev->macsec_ops;
345 else if (offload == MACSEC_OFFLOAD_MAC)
346 return macsec->real_dev->features & NETIF_F_HW_MACSEC &&
347 macsec->real_dev->macsec_ops;
348
349 return false;
350 }
351
__macsec_get_ops(enum macsec_offload offload,struct macsec_dev * macsec,struct macsec_context * ctx)352 static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload,
353 struct macsec_dev *macsec,
354 struct macsec_context *ctx)
355 {
356 if (ctx) {
357 memset(ctx, 0, sizeof(*ctx));
358 ctx->offload = offload;
359
360 if (offload == MACSEC_OFFLOAD_PHY)
361 ctx->phydev = macsec->real_dev->phydev;
362 else if (offload == MACSEC_OFFLOAD_MAC)
363 ctx->netdev = macsec->real_dev;
364 }
365
366 if (offload == MACSEC_OFFLOAD_PHY)
367 return macsec->real_dev->phydev->macsec_ops;
368 else
369 return macsec->real_dev->macsec_ops;
370 }
371
372 /* Returns a pointer to the MACsec ops struct if any and updates the MACsec
373 * context device reference if provided.
374 */
macsec_get_ops(struct macsec_dev * macsec,struct macsec_context * ctx)375 static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
376 struct macsec_context *ctx)
377 {
378 if (!macsec_check_offload(macsec->offload, macsec))
379 return NULL;
380
381 return __macsec_get_ops(macsec->offload, macsec, ctx);
382 }
383
384 /* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */
macsec_validate_skb(struct sk_buff * skb,u16 icv_len,bool xpn)385 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn)
386 {
387 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
388 int len = skb->len - 2 * ETH_ALEN;
389 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
390
391 /* a) It comprises at least 17 octets */
392 if (skb->len <= 16)
393 return false;
394
395 /* b) MACsec EtherType: already checked */
396
397 /* c) V bit is clear */
398 if (h->tci_an & MACSEC_TCI_VERSION)
399 return false;
400
401 /* d) ES or SCB => !SC */
402 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
403 (h->tci_an & MACSEC_TCI_SC))
404 return false;
405
406 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
407 if (h->unused)
408 return false;
409
410 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */
411 if (!h->packet_number && !xpn)
412 return false;
413
414 /* length check, f) g) h) i) */
415 if (h->short_length)
416 return len == extra_len + h->short_length;
417 return len >= extra_len + MIN_NON_SHORT_LEN;
418 }
419
420 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
421 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
422
macsec_fill_iv_xpn(unsigned char * iv,ssci_t ssci,u64 pn,salt_t salt)423 static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn,
424 salt_t salt)
425 {
426 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv;
427
428 gcm_iv->ssci = ssci ^ salt.ssci;
429 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn;
430 }
431
macsec_fill_iv(unsigned char * iv,sci_t sci,u32 pn)432 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
433 {
434 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
435
436 gcm_iv->sci = sci;
437 gcm_iv->pn = htonl(pn);
438 }
439
macsec_ethhdr(struct sk_buff * skb)440 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
441 {
442 return (struct macsec_eth_header *)skb_mac_header(skb);
443 }
444
__macsec_pn_wrapped(struct macsec_secy * secy,struct macsec_tx_sa * tx_sa)445 static void __macsec_pn_wrapped(struct macsec_secy *secy,
446 struct macsec_tx_sa *tx_sa)
447 {
448 pr_debug("PN wrapped, transitioning to !oper\n");
449 tx_sa->active = false;
450 if (secy->protect_frames)
451 secy->operational = false;
452 }
453
macsec_pn_wrapped(struct macsec_secy * secy,struct macsec_tx_sa * tx_sa)454 void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
455 {
456 spin_lock_bh(&tx_sa->lock);
457 __macsec_pn_wrapped(secy, tx_sa);
458 spin_unlock_bh(&tx_sa->lock);
459 }
460 EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
461
tx_sa_update_pn(struct macsec_tx_sa * tx_sa,struct macsec_secy * secy)462 static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
463 struct macsec_secy *secy)
464 {
465 pn_t pn;
466
467 spin_lock_bh(&tx_sa->lock);
468
469 pn = tx_sa->next_pn_halves;
470 if (secy->xpn)
471 tx_sa->next_pn++;
472 else
473 tx_sa->next_pn_halves.lower++;
474
475 if (tx_sa->next_pn == 0)
476 __macsec_pn_wrapped(secy, tx_sa);
477 spin_unlock_bh(&tx_sa->lock);
478
479 return pn;
480 }
481
macsec_encrypt_finish(struct sk_buff * skb,struct net_device * dev)482 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
483 {
484 struct macsec_dev *macsec = netdev_priv(dev);
485
486 skb->dev = macsec->real_dev;
487 skb_reset_mac_header(skb);
488 skb->protocol = eth_hdr(skb)->h_proto;
489 }
490
macsec_msdu_len(struct sk_buff * skb)491 static unsigned int macsec_msdu_len(struct sk_buff *skb)
492 {
493 struct macsec_dev *macsec = macsec_priv(skb->dev);
494 struct macsec_secy *secy = &macsec->secy;
495 bool sci_present = macsec_skb_cb(skb)->has_sci;
496
497 return skb->len - macsec_hdr_len(sci_present) - secy->icv_len;
498 }
499
macsec_count_tx(struct sk_buff * skb,struct macsec_tx_sc * tx_sc,struct macsec_tx_sa * tx_sa)500 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
501 struct macsec_tx_sa *tx_sa)
502 {
503 unsigned int msdu_len = macsec_msdu_len(skb);
504 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
505
506 u64_stats_update_begin(&txsc_stats->syncp);
507 if (tx_sc->encrypt) {
508 txsc_stats->stats.OutOctetsEncrypted += msdu_len;
509 txsc_stats->stats.OutPktsEncrypted++;
510 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
511 } else {
512 txsc_stats->stats.OutOctetsProtected += msdu_len;
513 txsc_stats->stats.OutPktsProtected++;
514 this_cpu_inc(tx_sa->stats->OutPktsProtected);
515 }
516 u64_stats_update_end(&txsc_stats->syncp);
517 }
518
count_tx(struct net_device * dev,int ret,int len)519 static void count_tx(struct net_device *dev, int ret, int len)
520 {
521 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
522 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
523
524 u64_stats_update_begin(&stats->syncp);
525 u64_stats_inc(&stats->tx_packets);
526 u64_stats_add(&stats->tx_bytes, len);
527 u64_stats_update_end(&stats->syncp);
528 }
529 }
530
macsec_encrypt_done(struct crypto_async_request * base,int err)531 static void macsec_encrypt_done(struct crypto_async_request *base, int err)
532 {
533 struct sk_buff *skb = base->data;
534 struct net_device *dev = skb->dev;
535 struct macsec_dev *macsec = macsec_priv(dev);
536 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
537 int len, ret;
538
539 aead_request_free(macsec_skb_cb(skb)->req);
540
541 rcu_read_lock_bh();
542 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
543 /* packet is encrypted/protected so tx_bytes must be calculated */
544 len = macsec_msdu_len(skb) + 2 * ETH_ALEN;
545 macsec_encrypt_finish(skb, dev);
546 ret = dev_queue_xmit(skb);
547 count_tx(dev, ret, len);
548 rcu_read_unlock_bh();
549
550 macsec_txsa_put(sa);
551 dev_put(dev);
552 }
553
macsec_alloc_req(struct crypto_aead * tfm,unsigned char ** iv,struct scatterlist ** sg,int num_frags)554 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
555 unsigned char **iv,
556 struct scatterlist **sg,
557 int num_frags)
558 {
559 size_t size, iv_offset, sg_offset;
560 struct aead_request *req;
561 void *tmp;
562
563 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
564 iv_offset = size;
565 size += GCM_AES_IV_LEN;
566
567 size = ALIGN(size, __alignof__(struct scatterlist));
568 sg_offset = size;
569 size += sizeof(struct scatterlist) * num_frags;
570
571 tmp = kmalloc(size, GFP_ATOMIC);
572 if (!tmp)
573 return NULL;
574
575 *iv = (unsigned char *)(tmp + iv_offset);
576 *sg = (struct scatterlist *)(tmp + sg_offset);
577 req = tmp;
578
579 aead_request_set_tfm(req, tfm);
580
581 return req;
582 }
583
macsec_encrypt(struct sk_buff * skb,struct net_device * dev)584 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
585 struct net_device *dev)
586 {
587 int ret;
588 struct scatterlist *sg;
589 struct sk_buff *trailer;
590 unsigned char *iv;
591 struct ethhdr *eth;
592 struct macsec_eth_header *hh;
593 size_t unprotected_len;
594 struct aead_request *req;
595 struct macsec_secy *secy;
596 struct macsec_tx_sc *tx_sc;
597 struct macsec_tx_sa *tx_sa;
598 struct macsec_dev *macsec = macsec_priv(dev);
599 bool sci_present;
600 pn_t pn;
601
602 secy = &macsec->secy;
603 tx_sc = &secy->tx_sc;
604
605 /* 10.5.1 TX SA assignment */
606 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
607 if (!tx_sa) {
608 secy->operational = false;
609 kfree_skb(skb);
610 return ERR_PTR(-EINVAL);
611 }
612
613 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
614 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
615 struct sk_buff *nskb = skb_copy_expand(skb,
616 MACSEC_NEEDED_HEADROOM,
617 MACSEC_NEEDED_TAILROOM,
618 GFP_ATOMIC);
619 if (likely(nskb)) {
620 consume_skb(skb);
621 skb = nskb;
622 } else {
623 macsec_txsa_put(tx_sa);
624 kfree_skb(skb);
625 return ERR_PTR(-ENOMEM);
626 }
627 } else {
628 skb = skb_unshare(skb, GFP_ATOMIC);
629 if (!skb) {
630 macsec_txsa_put(tx_sa);
631 return ERR_PTR(-ENOMEM);
632 }
633 }
634
635 unprotected_len = skb->len;
636 eth = eth_hdr(skb);
637 sci_present = macsec_send_sci(secy);
638 hh = skb_push(skb, macsec_extra_len(sci_present));
639 memmove(hh, eth, 2 * ETH_ALEN);
640
641 pn = tx_sa_update_pn(tx_sa, secy);
642 if (pn.full64 == 0) {
643 macsec_txsa_put(tx_sa);
644 kfree_skb(skb);
645 return ERR_PTR(-ENOLINK);
646 }
647 macsec_fill_sectag(hh, secy, pn.lower, sci_present);
648 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
649
650 skb_put(skb, secy->icv_len);
651
652 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
653 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
654
655 u64_stats_update_begin(&secy_stats->syncp);
656 secy_stats->stats.OutPktsTooLong++;
657 u64_stats_update_end(&secy_stats->syncp);
658
659 macsec_txsa_put(tx_sa);
660 kfree_skb(skb);
661 return ERR_PTR(-EINVAL);
662 }
663
664 ret = skb_cow_data(skb, 0, &trailer);
665 if (unlikely(ret < 0)) {
666 macsec_txsa_put(tx_sa);
667 kfree_skb(skb);
668 return ERR_PTR(ret);
669 }
670
671 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
672 if (!req) {
673 macsec_txsa_put(tx_sa);
674 kfree_skb(skb);
675 return ERR_PTR(-ENOMEM);
676 }
677
678 if (secy->xpn)
679 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt);
680 else
681 macsec_fill_iv(iv, secy->sci, pn.lower);
682
683 sg_init_table(sg, ret);
684 ret = skb_to_sgvec(skb, sg, 0, skb->len);
685 if (unlikely(ret < 0)) {
686 aead_request_free(req);
687 macsec_txsa_put(tx_sa);
688 kfree_skb(skb);
689 return ERR_PTR(ret);
690 }
691
692 if (tx_sc->encrypt) {
693 int len = skb->len - macsec_hdr_len(sci_present) -
694 secy->icv_len;
695 aead_request_set_crypt(req, sg, sg, len, iv);
696 aead_request_set_ad(req, macsec_hdr_len(sci_present));
697 } else {
698 aead_request_set_crypt(req, sg, sg, 0, iv);
699 aead_request_set_ad(req, skb->len - secy->icv_len);
700 }
701
702 macsec_skb_cb(skb)->req = req;
703 macsec_skb_cb(skb)->tx_sa = tx_sa;
704 macsec_skb_cb(skb)->has_sci = sci_present;
705 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
706
707 dev_hold(skb->dev);
708 ret = crypto_aead_encrypt(req);
709 if (ret == -EINPROGRESS) {
710 return ERR_PTR(ret);
711 } else if (ret != 0) {
712 dev_put(skb->dev);
713 kfree_skb(skb);
714 aead_request_free(req);
715 macsec_txsa_put(tx_sa);
716 return ERR_PTR(-EINVAL);
717 }
718
719 dev_put(skb->dev);
720 aead_request_free(req);
721 macsec_txsa_put(tx_sa);
722
723 return skb;
724 }
725
macsec_post_decrypt(struct sk_buff * skb,struct macsec_secy * secy,u32 pn)726 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
727 {
728 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
729 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
730 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
731 u32 lowest_pn = 0;
732
733 spin_lock(&rx_sa->lock);
734 if (rx_sa->next_pn_halves.lower >= secy->replay_window)
735 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
736
737 /* Now perform replay protection check again
738 * (see IEEE 802.1AE-2006 figure 10-5)
739 */
740 if (secy->replay_protect && pn < lowest_pn &&
741 (!secy->xpn || pn_same_half(pn, lowest_pn))) {
742 spin_unlock(&rx_sa->lock);
743 u64_stats_update_begin(&rxsc_stats->syncp);
744 rxsc_stats->stats.InPktsLate++;
745 u64_stats_update_end(&rxsc_stats->syncp);
746 secy->netdev->stats.rx_dropped++;
747 return false;
748 }
749
750 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
751 unsigned int msdu_len = macsec_msdu_len(skb);
752 u64_stats_update_begin(&rxsc_stats->syncp);
753 if (hdr->tci_an & MACSEC_TCI_E)
754 rxsc_stats->stats.InOctetsDecrypted += msdu_len;
755 else
756 rxsc_stats->stats.InOctetsValidated += msdu_len;
757 u64_stats_update_end(&rxsc_stats->syncp);
758 }
759
760 if (!macsec_skb_cb(skb)->valid) {
761 spin_unlock(&rx_sa->lock);
762
763 /* 10.6.5 */
764 if (hdr->tci_an & MACSEC_TCI_C ||
765 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
766 u64_stats_update_begin(&rxsc_stats->syncp);
767 rxsc_stats->stats.InPktsNotValid++;
768 u64_stats_update_end(&rxsc_stats->syncp);
769 this_cpu_inc(rx_sa->stats->InPktsNotValid);
770 secy->netdev->stats.rx_errors++;
771 return false;
772 }
773
774 u64_stats_update_begin(&rxsc_stats->syncp);
775 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
776 rxsc_stats->stats.InPktsInvalid++;
777 this_cpu_inc(rx_sa->stats->InPktsInvalid);
778 } else if (pn < lowest_pn) {
779 rxsc_stats->stats.InPktsDelayed++;
780 } else {
781 rxsc_stats->stats.InPktsUnchecked++;
782 }
783 u64_stats_update_end(&rxsc_stats->syncp);
784 } else {
785 u64_stats_update_begin(&rxsc_stats->syncp);
786 if (pn < lowest_pn) {
787 rxsc_stats->stats.InPktsDelayed++;
788 } else {
789 rxsc_stats->stats.InPktsOK++;
790 this_cpu_inc(rx_sa->stats->InPktsOK);
791 }
792 u64_stats_update_end(&rxsc_stats->syncp);
793
794 // Instead of "pn >=" - to support pn overflow in xpn
795 if (pn + 1 > rx_sa->next_pn_halves.lower) {
796 rx_sa->next_pn_halves.lower = pn + 1;
797 } else if (secy->xpn &&
798 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
799 rx_sa->next_pn_halves.upper++;
800 rx_sa->next_pn_halves.lower = pn + 1;
801 }
802
803 spin_unlock(&rx_sa->lock);
804 }
805
806 return true;
807 }
808
macsec_reset_skb(struct sk_buff * skb,struct net_device * dev)809 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
810 {
811 skb->pkt_type = PACKET_HOST;
812 skb->protocol = eth_type_trans(skb, dev);
813
814 skb_reset_network_header(skb);
815 if (!skb_transport_header_was_set(skb))
816 skb_reset_transport_header(skb);
817 skb_reset_mac_len(skb);
818 }
819
macsec_finalize_skb(struct sk_buff * skb,u8 icv_len,u8 hdr_len)820 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
821 {
822 skb->ip_summed = CHECKSUM_NONE;
823 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
824 skb_pull(skb, hdr_len);
825 pskb_trim_unique(skb, skb->len - icv_len);
826 }
827
count_rx(struct net_device * dev,int len)828 static void count_rx(struct net_device *dev, int len)
829 {
830 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
831
832 u64_stats_update_begin(&stats->syncp);
833 u64_stats_inc(&stats->rx_packets);
834 u64_stats_add(&stats->rx_bytes, len);
835 u64_stats_update_end(&stats->syncp);
836 }
837
macsec_decrypt_done(struct crypto_async_request * base,int err)838 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
839 {
840 struct sk_buff *skb = base->data;
841 struct net_device *dev = skb->dev;
842 struct macsec_dev *macsec = macsec_priv(dev);
843 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
844 struct macsec_rx_sc *rx_sc = rx_sa->sc;
845 int len;
846 u32 pn;
847
848 aead_request_free(macsec_skb_cb(skb)->req);
849
850 if (!err)
851 macsec_skb_cb(skb)->valid = true;
852
853 rcu_read_lock_bh();
854 pn = ntohl(macsec_ethhdr(skb)->packet_number);
855 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
856 rcu_read_unlock_bh();
857 kfree_skb(skb);
858 goto out;
859 }
860
861 macsec_finalize_skb(skb, macsec->secy.icv_len,
862 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
863 len = skb->len;
864 macsec_reset_skb(skb, macsec->secy.netdev);
865
866 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
867 count_rx(dev, len);
868
869 rcu_read_unlock_bh();
870
871 out:
872 macsec_rxsa_put(rx_sa);
873 macsec_rxsc_put(rx_sc);
874 dev_put(dev);
875 }
876
macsec_decrypt(struct sk_buff * skb,struct net_device * dev,struct macsec_rx_sa * rx_sa,sci_t sci,struct macsec_secy * secy)877 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
878 struct net_device *dev,
879 struct macsec_rx_sa *rx_sa,
880 sci_t sci,
881 struct macsec_secy *secy)
882 {
883 int ret;
884 struct scatterlist *sg;
885 struct sk_buff *trailer;
886 unsigned char *iv;
887 struct aead_request *req;
888 struct macsec_eth_header *hdr;
889 u32 hdr_pn;
890 u16 icv_len = secy->icv_len;
891
892 macsec_skb_cb(skb)->valid = false;
893 skb = skb_share_check(skb, GFP_ATOMIC);
894 if (!skb)
895 return ERR_PTR(-ENOMEM);
896
897 ret = skb_cow_data(skb, 0, &trailer);
898 if (unlikely(ret < 0)) {
899 kfree_skb(skb);
900 return ERR_PTR(ret);
901 }
902 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
903 if (!req) {
904 kfree_skb(skb);
905 return ERR_PTR(-ENOMEM);
906 }
907
908 hdr = (struct macsec_eth_header *)skb->data;
909 hdr_pn = ntohl(hdr->packet_number);
910
911 if (secy->xpn) {
912 pn_t recovered_pn = rx_sa->next_pn_halves;
913
914 recovered_pn.lower = hdr_pn;
915 if (hdr_pn < rx_sa->next_pn_halves.lower &&
916 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
917 recovered_pn.upper++;
918
919 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
920 rx_sa->key.salt);
921 } else {
922 macsec_fill_iv(iv, sci, hdr_pn);
923 }
924
925 sg_init_table(sg, ret);
926 ret = skb_to_sgvec(skb, sg, 0, skb->len);
927 if (unlikely(ret < 0)) {
928 aead_request_free(req);
929 kfree_skb(skb);
930 return ERR_PTR(ret);
931 }
932
933 if (hdr->tci_an & MACSEC_TCI_E) {
934 /* confidentiality: ethernet + macsec header
935 * authenticated, encrypted payload
936 */
937 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
938
939 aead_request_set_crypt(req, sg, sg, len, iv);
940 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
941 skb = skb_unshare(skb, GFP_ATOMIC);
942 if (!skb) {
943 aead_request_free(req);
944 return ERR_PTR(-ENOMEM);
945 }
946 } else {
947 /* integrity only: all headers + data authenticated */
948 aead_request_set_crypt(req, sg, sg, icv_len, iv);
949 aead_request_set_ad(req, skb->len - icv_len);
950 }
951
952 macsec_skb_cb(skb)->req = req;
953 skb->dev = dev;
954 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
955
956 dev_hold(dev);
957 ret = crypto_aead_decrypt(req);
958 if (ret == -EINPROGRESS) {
959 return ERR_PTR(ret);
960 } else if (ret != 0) {
961 /* decryption/authentication failed
962 * 10.6 if validateFrames is disabled, deliver anyway
963 */
964 if (ret != -EBADMSG) {
965 kfree_skb(skb);
966 skb = ERR_PTR(ret);
967 }
968 } else {
969 macsec_skb_cb(skb)->valid = true;
970 }
971 dev_put(dev);
972
973 aead_request_free(req);
974
975 return skb;
976 }
977
find_rx_sc(struct macsec_secy * secy,sci_t sci)978 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
979 {
980 struct macsec_rx_sc *rx_sc;
981
982 for_each_rxsc(secy, rx_sc) {
983 if (rx_sc->sci == sci)
984 return rx_sc;
985 }
986
987 return NULL;
988 }
989
find_rx_sc_rtnl(struct macsec_secy * secy,sci_t sci)990 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
991 {
992 struct macsec_rx_sc *rx_sc;
993
994 for_each_rxsc_rtnl(secy, rx_sc) {
995 if (rx_sc->sci == sci)
996 return rx_sc;
997 }
998
999 return NULL;
1000 }
1001
handle_not_macsec(struct sk_buff * skb)1002 static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
1003 {
1004 /* Deliver to the uncontrolled port by default */
1005 enum rx_handler_result ret = RX_HANDLER_PASS;
1006 struct ethhdr *hdr = eth_hdr(skb);
1007 struct metadata_dst *md_dst;
1008 struct macsec_rxh_data *rxd;
1009 struct macsec_dev *macsec;
1010
1011 rcu_read_lock();
1012 rxd = macsec_data_rcu(skb->dev);
1013 md_dst = skb_metadata_dst(skb);
1014
1015 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1016 struct sk_buff *nskb;
1017 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1018 struct net_device *ndev = macsec->secy.netdev;
1019
1020 /* If h/w offloading is enabled, HW decodes frames and strips
1021 * the SecTAG, so we have to deduce which port to deliver to.
1022 */
1023 if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
1024 if (md_dst && md_dst->type == METADATA_MACSEC &&
1025 (!find_rx_sc(&macsec->secy, md_dst->u.macsec_info.sci)))
1026 continue;
1027
1028 if (ether_addr_equal_64bits(hdr->h_dest,
1029 ndev->dev_addr)) {
1030 /* exact match, divert skb to this port */
1031 skb->dev = ndev;
1032 skb->pkt_type = PACKET_HOST;
1033 ret = RX_HANDLER_ANOTHER;
1034 goto out;
1035 } else if (is_multicast_ether_addr_64bits(
1036 hdr->h_dest)) {
1037 /* multicast frame, deliver on this port too */
1038 nskb = skb_clone(skb, GFP_ATOMIC);
1039 if (!nskb)
1040 break;
1041
1042 nskb->dev = ndev;
1043 if (ether_addr_equal_64bits(hdr->h_dest,
1044 ndev->broadcast))
1045 nskb->pkt_type = PACKET_BROADCAST;
1046 else
1047 nskb->pkt_type = PACKET_MULTICAST;
1048
1049 __netif_rx(nskb);
1050 }
1051 continue;
1052 }
1053
1054 /* 10.6 If the management control validateFrames is not
1055 * Strict, frames without a SecTAG are received, counted, and
1056 * delivered to the Controlled Port
1057 */
1058 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1059 u64_stats_update_begin(&secy_stats->syncp);
1060 secy_stats->stats.InPktsNoTag++;
1061 u64_stats_update_end(&secy_stats->syncp);
1062 macsec->secy.netdev->stats.rx_dropped++;
1063 continue;
1064 }
1065
1066 /* deliver on this port */
1067 nskb = skb_clone(skb, GFP_ATOMIC);
1068 if (!nskb)
1069 break;
1070
1071 nskb->dev = ndev;
1072
1073 if (__netif_rx(nskb) == NET_RX_SUCCESS) {
1074 u64_stats_update_begin(&secy_stats->syncp);
1075 secy_stats->stats.InPktsUntagged++;
1076 u64_stats_update_end(&secy_stats->syncp);
1077 }
1078 }
1079
1080 out:
1081 rcu_read_unlock();
1082 return ret;
1083 }
1084
macsec_handle_frame(struct sk_buff ** pskb)1085 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1086 {
1087 struct sk_buff *skb = *pskb;
1088 struct net_device *dev = skb->dev;
1089 struct macsec_eth_header *hdr;
1090 struct macsec_secy *secy = NULL;
1091 struct macsec_rx_sc *rx_sc;
1092 struct macsec_rx_sa *rx_sa;
1093 struct macsec_rxh_data *rxd;
1094 struct macsec_dev *macsec;
1095 unsigned int len;
1096 sci_t sci;
1097 u32 hdr_pn;
1098 bool cbit;
1099 struct pcpu_rx_sc_stats *rxsc_stats;
1100 struct pcpu_secy_stats *secy_stats;
1101 bool pulled_sci;
1102 int ret;
1103
1104 if (skb_headroom(skb) < ETH_HLEN)
1105 goto drop_direct;
1106
1107 hdr = macsec_ethhdr(skb);
1108 if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
1109 return handle_not_macsec(skb);
1110
1111 skb = skb_unshare(skb, GFP_ATOMIC);
1112 *pskb = skb;
1113 if (!skb)
1114 return RX_HANDLER_CONSUMED;
1115
1116 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1117 if (!pulled_sci) {
1118 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1119 goto drop_direct;
1120 }
1121
1122 hdr = macsec_ethhdr(skb);
1123
1124 /* Frames with a SecTAG that has the TCI E bit set but the C
1125 * bit clear are discarded, as this reserved encoding is used
1126 * to identify frames with a SecTAG that are not to be
1127 * delivered to the Controlled Port.
1128 */
1129 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1130 return RX_HANDLER_PASS;
1131
1132 /* now, pull the extra length */
1133 if (hdr->tci_an & MACSEC_TCI_SC) {
1134 if (!pulled_sci)
1135 goto drop_direct;
1136 }
1137
1138 /* ethernet header is part of crypto processing */
1139 skb_push(skb, ETH_HLEN);
1140
1141 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1142 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1143 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1144
1145 rcu_read_lock();
1146 rxd = macsec_data_rcu(skb->dev);
1147
1148 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1149 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1150
1151 sc = sc ? macsec_rxsc_get(sc) : NULL;
1152
1153 if (sc) {
1154 secy = &macsec->secy;
1155 rx_sc = sc;
1156 break;
1157 }
1158 }
1159
1160 if (!secy)
1161 goto nosci;
1162
1163 dev = secy->netdev;
1164 macsec = macsec_priv(dev);
1165 secy_stats = this_cpu_ptr(macsec->stats);
1166 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1167
1168 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
1169 u64_stats_update_begin(&secy_stats->syncp);
1170 secy_stats->stats.InPktsBadTag++;
1171 u64_stats_update_end(&secy_stats->syncp);
1172 secy->netdev->stats.rx_errors++;
1173 goto drop_nosa;
1174 }
1175
1176 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1177 if (!rx_sa) {
1178 /* 10.6.1 if the SA is not in use */
1179
1180 /* If validateFrames is Strict or the C bit in the
1181 * SecTAG is set, discard
1182 */
1183 struct macsec_rx_sa *active_rx_sa = macsec_active_rxsa_get(rx_sc);
1184 if (hdr->tci_an & MACSEC_TCI_C ||
1185 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1186 u64_stats_update_begin(&rxsc_stats->syncp);
1187 rxsc_stats->stats.InPktsNotUsingSA++;
1188 u64_stats_update_end(&rxsc_stats->syncp);
1189 secy->netdev->stats.rx_errors++;
1190 if (active_rx_sa)
1191 this_cpu_inc(active_rx_sa->stats->InPktsNotUsingSA);
1192 goto drop_nosa;
1193 }
1194
1195 /* not Strict, the frame (with the SecTAG and ICV
1196 * removed) is delivered to the Controlled Port.
1197 */
1198 u64_stats_update_begin(&rxsc_stats->syncp);
1199 rxsc_stats->stats.InPktsUnusedSA++;
1200 u64_stats_update_end(&rxsc_stats->syncp);
1201 if (active_rx_sa)
1202 this_cpu_inc(active_rx_sa->stats->InPktsUnusedSA);
1203 goto deliver;
1204 }
1205
1206 /* First, PN check to avoid decrypting obviously wrong packets */
1207 hdr_pn = ntohl(hdr->packet_number);
1208 if (secy->replay_protect) {
1209 bool late;
1210
1211 spin_lock(&rx_sa->lock);
1212 late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
1213 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
1214
1215 if (secy->xpn)
1216 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
1217 spin_unlock(&rx_sa->lock);
1218
1219 if (late) {
1220 u64_stats_update_begin(&rxsc_stats->syncp);
1221 rxsc_stats->stats.InPktsLate++;
1222 u64_stats_update_end(&rxsc_stats->syncp);
1223 macsec->secy.netdev->stats.rx_dropped++;
1224 goto drop;
1225 }
1226 }
1227
1228 macsec_skb_cb(skb)->rx_sa = rx_sa;
1229
1230 /* Disabled && !changed text => skip validation */
1231 if (hdr->tci_an & MACSEC_TCI_C ||
1232 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1233 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1234
1235 if (IS_ERR(skb)) {
1236 /* the decrypt callback needs the reference */
1237 if (PTR_ERR(skb) != -EINPROGRESS) {
1238 macsec_rxsa_put(rx_sa);
1239 macsec_rxsc_put(rx_sc);
1240 }
1241 rcu_read_unlock();
1242 *pskb = NULL;
1243 return RX_HANDLER_CONSUMED;
1244 }
1245
1246 if (!macsec_post_decrypt(skb, secy, hdr_pn))
1247 goto drop;
1248
1249 deliver:
1250 macsec_finalize_skb(skb, secy->icv_len,
1251 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1252 len = skb->len;
1253 macsec_reset_skb(skb, secy->netdev);
1254
1255 if (rx_sa)
1256 macsec_rxsa_put(rx_sa);
1257 macsec_rxsc_put(rx_sc);
1258
1259 skb_orphan(skb);
1260 ret = gro_cells_receive(&macsec->gro_cells, skb);
1261 if (ret == NET_RX_SUCCESS)
1262 count_rx(dev, len);
1263 else
1264 macsec->secy.netdev->stats.rx_dropped++;
1265
1266 rcu_read_unlock();
1267
1268 *pskb = NULL;
1269 return RX_HANDLER_CONSUMED;
1270
1271 drop:
1272 macsec_rxsa_put(rx_sa);
1273 drop_nosa:
1274 macsec_rxsc_put(rx_sc);
1275 rcu_read_unlock();
1276 drop_direct:
1277 kfree_skb(skb);
1278 *pskb = NULL;
1279 return RX_HANDLER_CONSUMED;
1280
1281 nosci:
1282 /* 10.6.1 if the SC is not found */
1283 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1284 if (!cbit)
1285 macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN,
1286 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1287
1288 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1289 struct sk_buff *nskb;
1290
1291 secy_stats = this_cpu_ptr(macsec->stats);
1292
1293 /* If validateFrames is Strict or the C bit in the
1294 * SecTAG is set, discard
1295 */
1296 if (cbit ||
1297 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1298 u64_stats_update_begin(&secy_stats->syncp);
1299 secy_stats->stats.InPktsNoSCI++;
1300 u64_stats_update_end(&secy_stats->syncp);
1301 macsec->secy.netdev->stats.rx_errors++;
1302 continue;
1303 }
1304
1305 /* not strict, the frame (with the SecTAG and ICV
1306 * removed) is delivered to the Controlled Port.
1307 */
1308 nskb = skb_clone(skb, GFP_ATOMIC);
1309 if (!nskb)
1310 break;
1311
1312 macsec_reset_skb(nskb, macsec->secy.netdev);
1313
1314 ret = __netif_rx(nskb);
1315 if (ret == NET_RX_SUCCESS) {
1316 u64_stats_update_begin(&secy_stats->syncp);
1317 secy_stats->stats.InPktsUnknownSCI++;
1318 u64_stats_update_end(&secy_stats->syncp);
1319 } else {
1320 macsec->secy.netdev->stats.rx_dropped++;
1321 }
1322 }
1323
1324 rcu_read_unlock();
1325 *pskb = skb;
1326 return RX_HANDLER_PASS;
1327 }
1328
macsec_alloc_tfm(char * key,int key_len,int icv_len)1329 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1330 {
1331 struct crypto_aead *tfm;
1332 int ret;
1333
1334 /* Pick a sync gcm(aes) cipher to ensure order is preserved. */
1335 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
1336
1337 if (IS_ERR(tfm))
1338 return tfm;
1339
1340 ret = crypto_aead_setkey(tfm, key, key_len);
1341 if (ret < 0)
1342 goto fail;
1343
1344 ret = crypto_aead_setauthsize(tfm, icv_len);
1345 if (ret < 0)
1346 goto fail;
1347
1348 return tfm;
1349 fail:
1350 crypto_free_aead(tfm);
1351 return ERR_PTR(ret);
1352 }
1353
init_rx_sa(struct macsec_rx_sa * rx_sa,char * sak,int key_len,int icv_len)1354 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1355 int icv_len)
1356 {
1357 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1358 if (!rx_sa->stats)
1359 return -ENOMEM;
1360
1361 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1362 if (IS_ERR(rx_sa->key.tfm)) {
1363 free_percpu(rx_sa->stats);
1364 return PTR_ERR(rx_sa->key.tfm);
1365 }
1366
1367 rx_sa->ssci = MACSEC_UNDEF_SSCI;
1368 rx_sa->active = false;
1369 rx_sa->next_pn = 1;
1370 refcount_set(&rx_sa->refcnt, 1);
1371 spin_lock_init(&rx_sa->lock);
1372
1373 return 0;
1374 }
1375
clear_rx_sa(struct macsec_rx_sa * rx_sa)1376 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1377 {
1378 rx_sa->active = false;
1379
1380 macsec_rxsa_put(rx_sa);
1381 }
1382
free_rx_sc(struct macsec_rx_sc * rx_sc)1383 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1384 {
1385 int i;
1386
1387 for (i = 0; i < MACSEC_NUM_AN; i++) {
1388 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1389
1390 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1391 if (sa)
1392 clear_rx_sa(sa);
1393 }
1394
1395 macsec_rxsc_put(rx_sc);
1396 }
1397
del_rx_sc(struct macsec_secy * secy,sci_t sci)1398 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1399 {
1400 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1401
1402 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1403 rx_sc;
1404 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1405 if (rx_sc->sci == sci) {
1406 if (rx_sc->active)
1407 secy->n_rx_sc--;
1408 rcu_assign_pointer(*rx_scp, rx_sc->next);
1409 return rx_sc;
1410 }
1411 }
1412
1413 return NULL;
1414 }
1415
create_rx_sc(struct net_device * dev,sci_t sci,bool active)1416 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci,
1417 bool active)
1418 {
1419 struct macsec_rx_sc *rx_sc;
1420 struct macsec_dev *macsec;
1421 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1422 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1423 struct macsec_secy *secy;
1424
1425 list_for_each_entry(macsec, &rxd->secys, secys) {
1426 if (find_rx_sc_rtnl(&macsec->secy, sci))
1427 return ERR_PTR(-EEXIST);
1428 }
1429
1430 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1431 if (!rx_sc)
1432 return ERR_PTR(-ENOMEM);
1433
1434 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1435 if (!rx_sc->stats) {
1436 kfree(rx_sc);
1437 return ERR_PTR(-ENOMEM);
1438 }
1439
1440 rx_sc->sci = sci;
1441 rx_sc->active = active;
1442 refcount_set(&rx_sc->refcnt, 1);
1443
1444 secy = &macsec_priv(dev)->secy;
1445 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1446 rcu_assign_pointer(secy->rx_sc, rx_sc);
1447
1448 if (rx_sc->active)
1449 secy->n_rx_sc++;
1450
1451 return rx_sc;
1452 }
1453
init_tx_sa(struct macsec_tx_sa * tx_sa,char * sak,int key_len,int icv_len)1454 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1455 int icv_len)
1456 {
1457 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1458 if (!tx_sa->stats)
1459 return -ENOMEM;
1460
1461 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1462 if (IS_ERR(tx_sa->key.tfm)) {
1463 free_percpu(tx_sa->stats);
1464 return PTR_ERR(tx_sa->key.tfm);
1465 }
1466
1467 tx_sa->ssci = MACSEC_UNDEF_SSCI;
1468 tx_sa->active = false;
1469 refcount_set(&tx_sa->refcnt, 1);
1470 spin_lock_init(&tx_sa->lock);
1471
1472 return 0;
1473 }
1474
clear_tx_sa(struct macsec_tx_sa * tx_sa)1475 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1476 {
1477 tx_sa->active = false;
1478
1479 macsec_txsa_put(tx_sa);
1480 }
1481
1482 static struct genl_family macsec_fam;
1483
get_dev_from_nl(struct net * net,struct nlattr ** attrs)1484 static struct net_device *get_dev_from_nl(struct net *net,
1485 struct nlattr **attrs)
1486 {
1487 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1488 struct net_device *dev;
1489
1490 dev = __dev_get_by_index(net, ifindex);
1491 if (!dev)
1492 return ERR_PTR(-ENODEV);
1493
1494 if (!netif_is_macsec(dev))
1495 return ERR_PTR(-ENODEV);
1496
1497 return dev;
1498 }
1499
nla_get_offload(const struct nlattr * nla)1500 static enum macsec_offload nla_get_offload(const struct nlattr *nla)
1501 {
1502 return (__force enum macsec_offload)nla_get_u8(nla);
1503 }
1504
nla_get_sci(const struct nlattr * nla)1505 static sci_t nla_get_sci(const struct nlattr *nla)
1506 {
1507 return (__force sci_t)nla_get_u64(nla);
1508 }
1509
nla_put_sci(struct sk_buff * skb,int attrtype,sci_t value,int padattr)1510 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1511 int padattr)
1512 {
1513 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1514 }
1515
nla_get_ssci(const struct nlattr * nla)1516 static ssci_t nla_get_ssci(const struct nlattr *nla)
1517 {
1518 return (__force ssci_t)nla_get_u32(nla);
1519 }
1520
nla_put_ssci(struct sk_buff * skb,int attrtype,ssci_t value)1521 static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
1522 {
1523 return nla_put_u32(skb, attrtype, (__force u64)value);
1524 }
1525
get_txsa_from_nl(struct net * net,struct nlattr ** attrs,struct nlattr ** tb_sa,struct net_device ** devp,struct macsec_secy ** secyp,struct macsec_tx_sc ** scp,u8 * assoc_num)1526 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1527 struct nlattr **attrs,
1528 struct nlattr **tb_sa,
1529 struct net_device **devp,
1530 struct macsec_secy **secyp,
1531 struct macsec_tx_sc **scp,
1532 u8 *assoc_num)
1533 {
1534 struct net_device *dev;
1535 struct macsec_secy *secy;
1536 struct macsec_tx_sc *tx_sc;
1537 struct macsec_tx_sa *tx_sa;
1538
1539 if (!tb_sa[MACSEC_SA_ATTR_AN])
1540 return ERR_PTR(-EINVAL);
1541
1542 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1543
1544 dev = get_dev_from_nl(net, attrs);
1545 if (IS_ERR(dev))
1546 return ERR_CAST(dev);
1547
1548 if (*assoc_num >= MACSEC_NUM_AN)
1549 return ERR_PTR(-EINVAL);
1550
1551 secy = &macsec_priv(dev)->secy;
1552 tx_sc = &secy->tx_sc;
1553
1554 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1555 if (!tx_sa)
1556 return ERR_PTR(-ENODEV);
1557
1558 *devp = dev;
1559 *scp = tx_sc;
1560 *secyp = secy;
1561 return tx_sa;
1562 }
1563
get_rxsc_from_nl(struct net * net,struct nlattr ** attrs,struct nlattr ** tb_rxsc,struct net_device ** devp,struct macsec_secy ** secyp)1564 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1565 struct nlattr **attrs,
1566 struct nlattr **tb_rxsc,
1567 struct net_device **devp,
1568 struct macsec_secy **secyp)
1569 {
1570 struct net_device *dev;
1571 struct macsec_secy *secy;
1572 struct macsec_rx_sc *rx_sc;
1573 sci_t sci;
1574
1575 dev = get_dev_from_nl(net, attrs);
1576 if (IS_ERR(dev))
1577 return ERR_CAST(dev);
1578
1579 secy = &macsec_priv(dev)->secy;
1580
1581 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1582 return ERR_PTR(-EINVAL);
1583
1584 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1585 rx_sc = find_rx_sc_rtnl(secy, sci);
1586 if (!rx_sc)
1587 return ERR_PTR(-ENODEV);
1588
1589 *secyp = secy;
1590 *devp = dev;
1591
1592 return rx_sc;
1593 }
1594
get_rxsa_from_nl(struct net * net,struct nlattr ** attrs,struct nlattr ** tb_rxsc,struct nlattr ** tb_sa,struct net_device ** devp,struct macsec_secy ** secyp,struct macsec_rx_sc ** scp,u8 * assoc_num)1595 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1596 struct nlattr **attrs,
1597 struct nlattr **tb_rxsc,
1598 struct nlattr **tb_sa,
1599 struct net_device **devp,
1600 struct macsec_secy **secyp,
1601 struct macsec_rx_sc **scp,
1602 u8 *assoc_num)
1603 {
1604 struct macsec_rx_sc *rx_sc;
1605 struct macsec_rx_sa *rx_sa;
1606
1607 if (!tb_sa[MACSEC_SA_ATTR_AN])
1608 return ERR_PTR(-EINVAL);
1609
1610 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1611 if (*assoc_num >= MACSEC_NUM_AN)
1612 return ERR_PTR(-EINVAL);
1613
1614 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1615 if (IS_ERR(rx_sc))
1616 return ERR_CAST(rx_sc);
1617
1618 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1619 if (!rx_sa)
1620 return ERR_PTR(-ENODEV);
1621
1622 *scp = rx_sc;
1623 return rx_sa;
1624 }
1625
1626 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1627 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1628 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1629 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1630 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1631 };
1632
1633 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1634 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1635 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1636 };
1637
1638 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1639 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1640 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1641 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4),
1642 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1643 .len = MACSEC_KEYID_LEN, },
1644 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1645 .len = MACSEC_MAX_KEY_LEN, },
1646 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
1647 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
1648 .len = MACSEC_SALT_LEN, },
1649 };
1650
1651 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
1652 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
1653 };
1654
1655 /* Offloads an operation to a device driver */
macsec_offload(int (* const func)(struct macsec_context *),struct macsec_context * ctx)1656 static int macsec_offload(int (* const func)(struct macsec_context *),
1657 struct macsec_context *ctx)
1658 {
1659 int ret;
1660
1661 if (unlikely(!func))
1662 return 0;
1663
1664 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1665 mutex_lock(&ctx->phydev->lock);
1666
1667 ret = (*func)(ctx);
1668
1669 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1670 mutex_unlock(&ctx->phydev->lock);
1671
1672 return ret;
1673 }
1674
parse_sa_config(struct nlattr ** attrs,struct nlattr ** tb_sa)1675 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1676 {
1677 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1678 return -EINVAL;
1679
1680 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1681 return -EINVAL;
1682
1683 return 0;
1684 }
1685
parse_rxsc_config(struct nlattr ** attrs,struct nlattr ** tb_rxsc)1686 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1687 {
1688 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1689 return -EINVAL;
1690
1691 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1692 return -EINVAL;
1693
1694 return 0;
1695 }
1696
validate_add_rxsa(struct nlattr ** attrs)1697 static bool validate_add_rxsa(struct nlattr **attrs)
1698 {
1699 if (!attrs[MACSEC_SA_ATTR_AN] ||
1700 !attrs[MACSEC_SA_ATTR_KEY] ||
1701 !attrs[MACSEC_SA_ATTR_KEYID])
1702 return false;
1703
1704 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1705 return false;
1706
1707 if (attrs[MACSEC_SA_ATTR_PN] &&
1708 nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1709 return false;
1710
1711 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1712 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1713 return false;
1714 }
1715
1716 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1717 return false;
1718
1719 return true;
1720 }
1721
macsec_add_rxsa(struct sk_buff * skb,struct genl_info * info)1722 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1723 {
1724 struct net_device *dev;
1725 struct nlattr **attrs = info->attrs;
1726 struct macsec_secy *secy;
1727 struct macsec_rx_sc *rx_sc;
1728 struct macsec_rx_sa *rx_sa;
1729 unsigned char assoc_num;
1730 int pn_len;
1731 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1732 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1733 int err;
1734
1735 if (!attrs[MACSEC_ATTR_IFINDEX])
1736 return -EINVAL;
1737
1738 if (parse_sa_config(attrs, tb_sa))
1739 return -EINVAL;
1740
1741 if (parse_rxsc_config(attrs, tb_rxsc))
1742 return -EINVAL;
1743
1744 if (!validate_add_rxsa(tb_sa))
1745 return -EINVAL;
1746
1747 rtnl_lock();
1748 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1749 if (IS_ERR(rx_sc)) {
1750 rtnl_unlock();
1751 return PTR_ERR(rx_sc);
1752 }
1753
1754 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1755
1756 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1757 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1758 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1759 rtnl_unlock();
1760 return -EINVAL;
1761 }
1762
1763 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1764 if (tb_sa[MACSEC_SA_ATTR_PN] &&
1765 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1766 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
1767 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1768 rtnl_unlock();
1769 return -EINVAL;
1770 }
1771
1772 if (secy->xpn) {
1773 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
1774 rtnl_unlock();
1775 return -EINVAL;
1776 }
1777
1778 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
1779 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
1780 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
1781 MACSEC_SALT_LEN);
1782 rtnl_unlock();
1783 return -EINVAL;
1784 }
1785 }
1786
1787 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1788 if (rx_sa) {
1789 rtnl_unlock();
1790 return -EBUSY;
1791 }
1792
1793 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1794 if (!rx_sa) {
1795 rtnl_unlock();
1796 return -ENOMEM;
1797 }
1798
1799 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1800 secy->key_len, secy->icv_len);
1801 if (err < 0) {
1802 kfree(rx_sa);
1803 rtnl_unlock();
1804 return err;
1805 }
1806
1807 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1808 spin_lock_bh(&rx_sa->lock);
1809 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
1810 spin_unlock_bh(&rx_sa->lock);
1811 }
1812
1813 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1814 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1815
1816 rx_sa->sc = rx_sc;
1817
1818 if (secy->xpn) {
1819 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
1820 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
1821 MACSEC_SALT_LEN);
1822 }
1823
1824 /* If h/w offloading is available, propagate to the device */
1825 if (macsec_is_offloaded(netdev_priv(dev))) {
1826 const struct macsec_ops *ops;
1827 struct macsec_context ctx;
1828
1829 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1830 if (!ops) {
1831 err = -EOPNOTSUPP;
1832 goto cleanup;
1833 }
1834
1835 ctx.sa.assoc_num = assoc_num;
1836 ctx.sa.rx_sa = rx_sa;
1837 ctx.secy = secy;
1838 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1839 secy->key_len);
1840
1841 err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1842 memzero_explicit(ctx.sa.key, secy->key_len);
1843 if (err)
1844 goto cleanup;
1845 }
1846
1847 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1848 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1849
1850 rtnl_unlock();
1851
1852 return 0;
1853
1854 cleanup:
1855 macsec_rxsa_put(rx_sa);
1856 rtnl_unlock();
1857 return err;
1858 }
1859
validate_add_rxsc(struct nlattr ** attrs)1860 static bool validate_add_rxsc(struct nlattr **attrs)
1861 {
1862 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1863 return false;
1864
1865 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1866 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1867 return false;
1868 }
1869
1870 return true;
1871 }
1872
macsec_add_rxsc(struct sk_buff * skb,struct genl_info * info)1873 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1874 {
1875 struct net_device *dev;
1876 sci_t sci = MACSEC_UNDEF_SCI;
1877 struct nlattr **attrs = info->attrs;
1878 struct macsec_rx_sc *rx_sc;
1879 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1880 struct macsec_secy *secy;
1881 bool active = true;
1882 int ret;
1883
1884 if (!attrs[MACSEC_ATTR_IFINDEX])
1885 return -EINVAL;
1886
1887 if (parse_rxsc_config(attrs, tb_rxsc))
1888 return -EINVAL;
1889
1890 if (!validate_add_rxsc(tb_rxsc))
1891 return -EINVAL;
1892
1893 rtnl_lock();
1894 dev = get_dev_from_nl(genl_info_net(info), attrs);
1895 if (IS_ERR(dev)) {
1896 rtnl_unlock();
1897 return PTR_ERR(dev);
1898 }
1899
1900 secy = &macsec_priv(dev)->secy;
1901 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1902
1903 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1904 active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1905
1906 rx_sc = create_rx_sc(dev, sci, active);
1907 if (IS_ERR(rx_sc)) {
1908 rtnl_unlock();
1909 return PTR_ERR(rx_sc);
1910 }
1911
1912 if (macsec_is_offloaded(netdev_priv(dev))) {
1913 const struct macsec_ops *ops;
1914 struct macsec_context ctx;
1915
1916 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1917 if (!ops) {
1918 ret = -EOPNOTSUPP;
1919 goto cleanup;
1920 }
1921
1922 ctx.rx_sc = rx_sc;
1923 ctx.secy = secy;
1924
1925 ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1926 if (ret)
1927 goto cleanup;
1928 }
1929
1930 rtnl_unlock();
1931
1932 return 0;
1933
1934 cleanup:
1935 del_rx_sc(secy, sci);
1936 free_rx_sc(rx_sc);
1937 rtnl_unlock();
1938 return ret;
1939 }
1940
validate_add_txsa(struct nlattr ** attrs)1941 static bool validate_add_txsa(struct nlattr **attrs)
1942 {
1943 if (!attrs[MACSEC_SA_ATTR_AN] ||
1944 !attrs[MACSEC_SA_ATTR_PN] ||
1945 !attrs[MACSEC_SA_ATTR_KEY] ||
1946 !attrs[MACSEC_SA_ATTR_KEYID])
1947 return false;
1948
1949 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1950 return false;
1951
1952 if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1953 return false;
1954
1955 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1956 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1957 return false;
1958 }
1959
1960 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1961 return false;
1962
1963 return true;
1964 }
1965
macsec_add_txsa(struct sk_buff * skb,struct genl_info * info)1966 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1967 {
1968 struct net_device *dev;
1969 struct nlattr **attrs = info->attrs;
1970 struct macsec_secy *secy;
1971 struct macsec_tx_sc *tx_sc;
1972 struct macsec_tx_sa *tx_sa;
1973 unsigned char assoc_num;
1974 int pn_len;
1975 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1976 bool was_operational;
1977 int err;
1978
1979 if (!attrs[MACSEC_ATTR_IFINDEX])
1980 return -EINVAL;
1981
1982 if (parse_sa_config(attrs, tb_sa))
1983 return -EINVAL;
1984
1985 if (!validate_add_txsa(tb_sa))
1986 return -EINVAL;
1987
1988 rtnl_lock();
1989 dev = get_dev_from_nl(genl_info_net(info), attrs);
1990 if (IS_ERR(dev)) {
1991 rtnl_unlock();
1992 return PTR_ERR(dev);
1993 }
1994
1995 secy = &macsec_priv(dev)->secy;
1996 tx_sc = &secy->tx_sc;
1997
1998 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1999
2000 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
2001 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
2002 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
2003 rtnl_unlock();
2004 return -EINVAL;
2005 }
2006
2007 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2008 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2009 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
2010 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2011 rtnl_unlock();
2012 return -EINVAL;
2013 }
2014
2015 if (secy->xpn) {
2016 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
2017 rtnl_unlock();
2018 return -EINVAL;
2019 }
2020
2021 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
2022 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
2023 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
2024 MACSEC_SALT_LEN);
2025 rtnl_unlock();
2026 return -EINVAL;
2027 }
2028 }
2029
2030 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
2031 if (tx_sa) {
2032 rtnl_unlock();
2033 return -EBUSY;
2034 }
2035
2036 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
2037 if (!tx_sa) {
2038 rtnl_unlock();
2039 return -ENOMEM;
2040 }
2041
2042 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2043 secy->key_len, secy->icv_len);
2044 if (err < 0) {
2045 kfree(tx_sa);
2046 rtnl_unlock();
2047 return err;
2048 }
2049
2050 spin_lock_bh(&tx_sa->lock);
2051 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2052 spin_unlock_bh(&tx_sa->lock);
2053
2054 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2055 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2056
2057 was_operational = secy->operational;
2058 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
2059 secy->operational = true;
2060
2061 if (secy->xpn) {
2062 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
2063 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
2064 MACSEC_SALT_LEN);
2065 }
2066
2067 /* If h/w offloading is available, propagate to the device */
2068 if (macsec_is_offloaded(netdev_priv(dev))) {
2069 const struct macsec_ops *ops;
2070 struct macsec_context ctx;
2071
2072 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2073 if (!ops) {
2074 err = -EOPNOTSUPP;
2075 goto cleanup;
2076 }
2077
2078 ctx.sa.assoc_num = assoc_num;
2079 ctx.sa.tx_sa = tx_sa;
2080 ctx.secy = secy;
2081 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2082 secy->key_len);
2083
2084 err = macsec_offload(ops->mdo_add_txsa, &ctx);
2085 memzero_explicit(ctx.sa.key, secy->key_len);
2086 if (err)
2087 goto cleanup;
2088 }
2089
2090 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
2091 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
2092
2093 rtnl_unlock();
2094
2095 return 0;
2096
2097 cleanup:
2098 secy->operational = was_operational;
2099 macsec_txsa_put(tx_sa);
2100 rtnl_unlock();
2101 return err;
2102 }
2103
macsec_del_rxsa(struct sk_buff * skb,struct genl_info * info)2104 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
2105 {
2106 struct nlattr **attrs = info->attrs;
2107 struct net_device *dev;
2108 struct macsec_secy *secy;
2109 struct macsec_rx_sc *rx_sc;
2110 struct macsec_rx_sa *rx_sa;
2111 u8 assoc_num;
2112 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2113 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2114 int ret;
2115
2116 if (!attrs[MACSEC_ATTR_IFINDEX])
2117 return -EINVAL;
2118
2119 if (parse_sa_config(attrs, tb_sa))
2120 return -EINVAL;
2121
2122 if (parse_rxsc_config(attrs, tb_rxsc))
2123 return -EINVAL;
2124
2125 rtnl_lock();
2126 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2127 &dev, &secy, &rx_sc, &assoc_num);
2128 if (IS_ERR(rx_sa)) {
2129 rtnl_unlock();
2130 return PTR_ERR(rx_sa);
2131 }
2132
2133 if (rx_sa->active) {
2134 rtnl_unlock();
2135 return -EBUSY;
2136 }
2137
2138 /* If h/w offloading is available, propagate to the device */
2139 if (macsec_is_offloaded(netdev_priv(dev))) {
2140 const struct macsec_ops *ops;
2141 struct macsec_context ctx;
2142
2143 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2144 if (!ops) {
2145 ret = -EOPNOTSUPP;
2146 goto cleanup;
2147 }
2148
2149 ctx.sa.assoc_num = assoc_num;
2150 ctx.sa.rx_sa = rx_sa;
2151 ctx.secy = secy;
2152
2153 ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
2154 if (ret)
2155 goto cleanup;
2156 }
2157
2158 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
2159 clear_rx_sa(rx_sa);
2160
2161 rtnl_unlock();
2162
2163 return 0;
2164
2165 cleanup:
2166 rtnl_unlock();
2167 return ret;
2168 }
2169
macsec_del_rxsc(struct sk_buff * skb,struct genl_info * info)2170 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
2171 {
2172 struct nlattr **attrs = info->attrs;
2173 struct net_device *dev;
2174 struct macsec_secy *secy;
2175 struct macsec_rx_sc *rx_sc;
2176 sci_t sci;
2177 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2178 int ret;
2179
2180 if (!attrs[MACSEC_ATTR_IFINDEX])
2181 return -EINVAL;
2182
2183 if (parse_rxsc_config(attrs, tb_rxsc))
2184 return -EINVAL;
2185
2186 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
2187 return -EINVAL;
2188
2189 rtnl_lock();
2190 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2191 if (IS_ERR(dev)) {
2192 rtnl_unlock();
2193 return PTR_ERR(dev);
2194 }
2195
2196 secy = &macsec_priv(dev)->secy;
2197 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2198
2199 rx_sc = del_rx_sc(secy, sci);
2200 if (!rx_sc) {
2201 rtnl_unlock();
2202 return -ENODEV;
2203 }
2204
2205 /* If h/w offloading is available, propagate to the device */
2206 if (macsec_is_offloaded(netdev_priv(dev))) {
2207 const struct macsec_ops *ops;
2208 struct macsec_context ctx;
2209
2210 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2211 if (!ops) {
2212 ret = -EOPNOTSUPP;
2213 goto cleanup;
2214 }
2215
2216 ctx.rx_sc = rx_sc;
2217 ctx.secy = secy;
2218 ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2219 if (ret)
2220 goto cleanup;
2221 }
2222
2223 free_rx_sc(rx_sc);
2224 rtnl_unlock();
2225
2226 return 0;
2227
2228 cleanup:
2229 rtnl_unlock();
2230 return ret;
2231 }
2232
macsec_del_txsa(struct sk_buff * skb,struct genl_info * info)2233 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2234 {
2235 struct nlattr **attrs = info->attrs;
2236 struct net_device *dev;
2237 struct macsec_secy *secy;
2238 struct macsec_tx_sc *tx_sc;
2239 struct macsec_tx_sa *tx_sa;
2240 u8 assoc_num;
2241 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2242 int ret;
2243
2244 if (!attrs[MACSEC_ATTR_IFINDEX])
2245 return -EINVAL;
2246
2247 if (parse_sa_config(attrs, tb_sa))
2248 return -EINVAL;
2249
2250 rtnl_lock();
2251 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2252 &dev, &secy, &tx_sc, &assoc_num);
2253 if (IS_ERR(tx_sa)) {
2254 rtnl_unlock();
2255 return PTR_ERR(tx_sa);
2256 }
2257
2258 if (tx_sa->active) {
2259 rtnl_unlock();
2260 return -EBUSY;
2261 }
2262
2263 /* If h/w offloading is available, propagate to the device */
2264 if (macsec_is_offloaded(netdev_priv(dev))) {
2265 const struct macsec_ops *ops;
2266 struct macsec_context ctx;
2267
2268 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2269 if (!ops) {
2270 ret = -EOPNOTSUPP;
2271 goto cleanup;
2272 }
2273
2274 ctx.sa.assoc_num = assoc_num;
2275 ctx.sa.tx_sa = tx_sa;
2276 ctx.secy = secy;
2277
2278 ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2279 if (ret)
2280 goto cleanup;
2281 }
2282
2283 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2284 clear_tx_sa(tx_sa);
2285
2286 rtnl_unlock();
2287
2288 return 0;
2289
2290 cleanup:
2291 rtnl_unlock();
2292 return ret;
2293 }
2294
validate_upd_sa(struct nlattr ** attrs)2295 static bool validate_upd_sa(struct nlattr **attrs)
2296 {
2297 if (!attrs[MACSEC_SA_ATTR_AN] ||
2298 attrs[MACSEC_SA_ATTR_KEY] ||
2299 attrs[MACSEC_SA_ATTR_KEYID] ||
2300 attrs[MACSEC_SA_ATTR_SSCI] ||
2301 attrs[MACSEC_SA_ATTR_SALT])
2302 return false;
2303
2304 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2305 return false;
2306
2307 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
2308 return false;
2309
2310 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2311 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2312 return false;
2313 }
2314
2315 return true;
2316 }
2317
macsec_upd_txsa(struct sk_buff * skb,struct genl_info * info)2318 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2319 {
2320 struct nlattr **attrs = info->attrs;
2321 struct net_device *dev;
2322 struct macsec_secy *secy;
2323 struct macsec_tx_sc *tx_sc;
2324 struct macsec_tx_sa *tx_sa;
2325 u8 assoc_num;
2326 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2327 bool was_operational, was_active;
2328 pn_t prev_pn;
2329 int ret = 0;
2330
2331 prev_pn.full64 = 0;
2332
2333 if (!attrs[MACSEC_ATTR_IFINDEX])
2334 return -EINVAL;
2335
2336 if (parse_sa_config(attrs, tb_sa))
2337 return -EINVAL;
2338
2339 if (!validate_upd_sa(tb_sa))
2340 return -EINVAL;
2341
2342 rtnl_lock();
2343 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2344 &dev, &secy, &tx_sc, &assoc_num);
2345 if (IS_ERR(tx_sa)) {
2346 rtnl_unlock();
2347 return PTR_ERR(tx_sa);
2348 }
2349
2350 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2351 int pn_len;
2352
2353 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2354 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2355 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
2356 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2357 rtnl_unlock();
2358 return -EINVAL;
2359 }
2360
2361 spin_lock_bh(&tx_sa->lock);
2362 prev_pn = tx_sa->next_pn_halves;
2363 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2364 spin_unlock_bh(&tx_sa->lock);
2365 }
2366
2367 was_active = tx_sa->active;
2368 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2369 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2370
2371 was_operational = secy->operational;
2372 if (assoc_num == tx_sc->encoding_sa)
2373 secy->operational = tx_sa->active;
2374
2375 /* If h/w offloading is available, propagate to the device */
2376 if (macsec_is_offloaded(netdev_priv(dev))) {
2377 const struct macsec_ops *ops;
2378 struct macsec_context ctx;
2379
2380 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2381 if (!ops) {
2382 ret = -EOPNOTSUPP;
2383 goto cleanup;
2384 }
2385
2386 ctx.sa.assoc_num = assoc_num;
2387 ctx.sa.tx_sa = tx_sa;
2388 ctx.secy = secy;
2389
2390 ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
2391 if (ret)
2392 goto cleanup;
2393 }
2394
2395 rtnl_unlock();
2396
2397 return 0;
2398
2399 cleanup:
2400 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2401 spin_lock_bh(&tx_sa->lock);
2402 tx_sa->next_pn_halves = prev_pn;
2403 spin_unlock_bh(&tx_sa->lock);
2404 }
2405 tx_sa->active = was_active;
2406 secy->operational = was_operational;
2407 rtnl_unlock();
2408 return ret;
2409 }
2410
macsec_upd_rxsa(struct sk_buff * skb,struct genl_info * info)2411 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2412 {
2413 struct nlattr **attrs = info->attrs;
2414 struct net_device *dev;
2415 struct macsec_secy *secy;
2416 struct macsec_rx_sc *rx_sc;
2417 struct macsec_rx_sa *rx_sa;
2418 u8 assoc_num;
2419 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2420 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2421 bool was_active;
2422 pn_t prev_pn;
2423 int ret = 0;
2424
2425 prev_pn.full64 = 0;
2426
2427 if (!attrs[MACSEC_ATTR_IFINDEX])
2428 return -EINVAL;
2429
2430 if (parse_rxsc_config(attrs, tb_rxsc))
2431 return -EINVAL;
2432
2433 if (parse_sa_config(attrs, tb_sa))
2434 return -EINVAL;
2435
2436 if (!validate_upd_sa(tb_sa))
2437 return -EINVAL;
2438
2439 rtnl_lock();
2440 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2441 &dev, &secy, &rx_sc, &assoc_num);
2442 if (IS_ERR(rx_sa)) {
2443 rtnl_unlock();
2444 return PTR_ERR(rx_sa);
2445 }
2446
2447 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2448 int pn_len;
2449
2450 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2451 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2452 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
2453 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2454 rtnl_unlock();
2455 return -EINVAL;
2456 }
2457
2458 spin_lock_bh(&rx_sa->lock);
2459 prev_pn = rx_sa->next_pn_halves;
2460 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2461 spin_unlock_bh(&rx_sa->lock);
2462 }
2463
2464 was_active = rx_sa->active;
2465 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2466 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2467
2468 /* If h/w offloading is available, propagate to the device */
2469 if (macsec_is_offloaded(netdev_priv(dev))) {
2470 const struct macsec_ops *ops;
2471 struct macsec_context ctx;
2472
2473 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2474 if (!ops) {
2475 ret = -EOPNOTSUPP;
2476 goto cleanup;
2477 }
2478
2479 ctx.sa.assoc_num = assoc_num;
2480 ctx.sa.rx_sa = rx_sa;
2481 ctx.secy = secy;
2482
2483 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2484 if (ret)
2485 goto cleanup;
2486 }
2487
2488 rtnl_unlock();
2489 return 0;
2490
2491 cleanup:
2492 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2493 spin_lock_bh(&rx_sa->lock);
2494 rx_sa->next_pn_halves = prev_pn;
2495 spin_unlock_bh(&rx_sa->lock);
2496 }
2497 rx_sa->active = was_active;
2498 rtnl_unlock();
2499 return ret;
2500 }
2501
macsec_upd_rxsc(struct sk_buff * skb,struct genl_info * info)2502 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2503 {
2504 struct nlattr **attrs = info->attrs;
2505 struct net_device *dev;
2506 struct macsec_secy *secy;
2507 struct macsec_rx_sc *rx_sc;
2508 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2509 unsigned int prev_n_rx_sc;
2510 bool was_active;
2511 int ret;
2512
2513 if (!attrs[MACSEC_ATTR_IFINDEX])
2514 return -EINVAL;
2515
2516 if (parse_rxsc_config(attrs, tb_rxsc))
2517 return -EINVAL;
2518
2519 if (!validate_add_rxsc(tb_rxsc))
2520 return -EINVAL;
2521
2522 rtnl_lock();
2523 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2524 if (IS_ERR(rx_sc)) {
2525 rtnl_unlock();
2526 return PTR_ERR(rx_sc);
2527 }
2528
2529 was_active = rx_sc->active;
2530 prev_n_rx_sc = secy->n_rx_sc;
2531 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2532 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2533
2534 if (rx_sc->active != new)
2535 secy->n_rx_sc += new ? 1 : -1;
2536
2537 rx_sc->active = new;
2538 }
2539
2540 /* If h/w offloading is available, propagate to the device */
2541 if (macsec_is_offloaded(netdev_priv(dev))) {
2542 const struct macsec_ops *ops;
2543 struct macsec_context ctx;
2544
2545 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2546 if (!ops) {
2547 ret = -EOPNOTSUPP;
2548 goto cleanup;
2549 }
2550
2551 ctx.rx_sc = rx_sc;
2552 ctx.secy = secy;
2553
2554 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2555 if (ret)
2556 goto cleanup;
2557 }
2558
2559 rtnl_unlock();
2560
2561 return 0;
2562
2563 cleanup:
2564 secy->n_rx_sc = prev_n_rx_sc;
2565 rx_sc->active = was_active;
2566 rtnl_unlock();
2567 return ret;
2568 }
2569
macsec_is_configured(struct macsec_dev * macsec)2570 static bool macsec_is_configured(struct macsec_dev *macsec)
2571 {
2572 struct macsec_secy *secy = &macsec->secy;
2573 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2574 int i;
2575
2576 if (secy->rx_sc)
2577 return true;
2578
2579 for (i = 0; i < MACSEC_NUM_AN; i++)
2580 if (tx_sc->sa[i])
2581 return true;
2582
2583 return false;
2584 }
2585
macsec_upd_offload(struct sk_buff * skb,struct genl_info * info)2586 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2587 {
2588 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2589 enum macsec_offload offload, prev_offload;
2590 int (*func)(struct macsec_context *ctx);
2591 struct nlattr **attrs = info->attrs;
2592 struct net_device *dev;
2593 const struct macsec_ops *ops;
2594 struct macsec_context ctx;
2595 struct macsec_dev *macsec;
2596 int ret;
2597
2598 if (!attrs[MACSEC_ATTR_IFINDEX])
2599 return -EINVAL;
2600
2601 if (!attrs[MACSEC_ATTR_OFFLOAD])
2602 return -EINVAL;
2603
2604 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2605 attrs[MACSEC_ATTR_OFFLOAD],
2606 macsec_genl_offload_policy, NULL))
2607 return -EINVAL;
2608
2609 dev = get_dev_from_nl(genl_info_net(info), attrs);
2610 if (IS_ERR(dev))
2611 return PTR_ERR(dev);
2612 macsec = macsec_priv(dev);
2613
2614 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE])
2615 return -EINVAL;
2616
2617 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2618 if (macsec->offload == offload)
2619 return 0;
2620
2621 /* Check if the offloading mode is supported by the underlying layers */
2622 if (offload != MACSEC_OFFLOAD_OFF &&
2623 !macsec_check_offload(offload, macsec))
2624 return -EOPNOTSUPP;
2625
2626 /* Check if the net device is busy. */
2627 if (netif_running(dev))
2628 return -EBUSY;
2629
2630 rtnl_lock();
2631
2632 prev_offload = macsec->offload;
2633 macsec->offload = offload;
2634
2635 /* Check if the device already has rules configured: we do not support
2636 * rules migration.
2637 */
2638 if (macsec_is_configured(macsec)) {
2639 ret = -EBUSY;
2640 goto rollback;
2641 }
2642
2643 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2644 macsec, &ctx);
2645 if (!ops) {
2646 ret = -EOPNOTSUPP;
2647 goto rollback;
2648 }
2649
2650 if (prev_offload == MACSEC_OFFLOAD_OFF)
2651 func = ops->mdo_add_secy;
2652 else
2653 func = ops->mdo_del_secy;
2654
2655 ctx.secy = &macsec->secy;
2656 ret = macsec_offload(func, &ctx);
2657 if (ret)
2658 goto rollback;
2659
2660 rtnl_unlock();
2661 return 0;
2662
2663 rollback:
2664 macsec->offload = prev_offload;
2665
2666 rtnl_unlock();
2667 return ret;
2668 }
2669
get_tx_sa_stats(struct net_device * dev,int an,struct macsec_tx_sa * tx_sa,struct macsec_tx_sa_stats * sum)2670 static void get_tx_sa_stats(struct net_device *dev, int an,
2671 struct macsec_tx_sa *tx_sa,
2672 struct macsec_tx_sa_stats *sum)
2673 {
2674 struct macsec_dev *macsec = macsec_priv(dev);
2675 int cpu;
2676
2677 /* If h/w offloading is available, propagate to the device */
2678 if (macsec_is_offloaded(macsec)) {
2679 const struct macsec_ops *ops;
2680 struct macsec_context ctx;
2681
2682 ops = macsec_get_ops(macsec, &ctx);
2683 if (ops) {
2684 ctx.sa.assoc_num = an;
2685 ctx.sa.tx_sa = tx_sa;
2686 ctx.stats.tx_sa_stats = sum;
2687 ctx.secy = &macsec_priv(dev)->secy;
2688 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
2689 }
2690 return;
2691 }
2692
2693 for_each_possible_cpu(cpu) {
2694 const struct macsec_tx_sa_stats *stats =
2695 per_cpu_ptr(tx_sa->stats, cpu);
2696
2697 sum->OutPktsProtected += stats->OutPktsProtected;
2698 sum->OutPktsEncrypted += stats->OutPktsEncrypted;
2699 }
2700 }
2701
copy_tx_sa_stats(struct sk_buff * skb,struct macsec_tx_sa_stats * sum)2702 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
2703 {
2704 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
2705 sum->OutPktsProtected) ||
2706 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2707 sum->OutPktsEncrypted))
2708 return -EMSGSIZE;
2709
2710 return 0;
2711 }
2712
get_rx_sa_stats(struct net_device * dev,struct macsec_rx_sc * rx_sc,int an,struct macsec_rx_sa * rx_sa,struct macsec_rx_sa_stats * sum)2713 static void get_rx_sa_stats(struct net_device *dev,
2714 struct macsec_rx_sc *rx_sc, int an,
2715 struct macsec_rx_sa *rx_sa,
2716 struct macsec_rx_sa_stats *sum)
2717 {
2718 struct macsec_dev *macsec = macsec_priv(dev);
2719 int cpu;
2720
2721 /* If h/w offloading is available, propagate to the device */
2722 if (macsec_is_offloaded(macsec)) {
2723 const struct macsec_ops *ops;
2724 struct macsec_context ctx;
2725
2726 ops = macsec_get_ops(macsec, &ctx);
2727 if (ops) {
2728 ctx.sa.assoc_num = an;
2729 ctx.sa.rx_sa = rx_sa;
2730 ctx.stats.rx_sa_stats = sum;
2731 ctx.secy = &macsec_priv(dev)->secy;
2732 ctx.rx_sc = rx_sc;
2733 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
2734 }
2735 return;
2736 }
2737
2738 for_each_possible_cpu(cpu) {
2739 const struct macsec_rx_sa_stats *stats =
2740 per_cpu_ptr(rx_sa->stats, cpu);
2741
2742 sum->InPktsOK += stats->InPktsOK;
2743 sum->InPktsInvalid += stats->InPktsInvalid;
2744 sum->InPktsNotValid += stats->InPktsNotValid;
2745 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
2746 sum->InPktsUnusedSA += stats->InPktsUnusedSA;
2747 }
2748 }
2749
copy_rx_sa_stats(struct sk_buff * skb,struct macsec_rx_sa_stats * sum)2750 static int copy_rx_sa_stats(struct sk_buff *skb,
2751 struct macsec_rx_sa_stats *sum)
2752 {
2753 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
2754 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
2755 sum->InPktsInvalid) ||
2756 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
2757 sum->InPktsNotValid) ||
2758 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2759 sum->InPktsNotUsingSA) ||
2760 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
2761 sum->InPktsUnusedSA))
2762 return -EMSGSIZE;
2763
2764 return 0;
2765 }
2766
get_rx_sc_stats(struct net_device * dev,struct macsec_rx_sc * rx_sc,struct macsec_rx_sc_stats * sum)2767 static void get_rx_sc_stats(struct net_device *dev,
2768 struct macsec_rx_sc *rx_sc,
2769 struct macsec_rx_sc_stats *sum)
2770 {
2771 struct macsec_dev *macsec = macsec_priv(dev);
2772 int cpu;
2773
2774 /* If h/w offloading is available, propagate to the device */
2775 if (macsec_is_offloaded(macsec)) {
2776 const struct macsec_ops *ops;
2777 struct macsec_context ctx;
2778
2779 ops = macsec_get_ops(macsec, &ctx);
2780 if (ops) {
2781 ctx.stats.rx_sc_stats = sum;
2782 ctx.secy = &macsec_priv(dev)->secy;
2783 ctx.rx_sc = rx_sc;
2784 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
2785 }
2786 return;
2787 }
2788
2789 for_each_possible_cpu(cpu) {
2790 const struct pcpu_rx_sc_stats *stats;
2791 struct macsec_rx_sc_stats tmp;
2792 unsigned int start;
2793
2794 stats = per_cpu_ptr(rx_sc->stats, cpu);
2795 do {
2796 start = u64_stats_fetch_begin_irq(&stats->syncp);
2797 memcpy(&tmp, &stats->stats, sizeof(tmp));
2798 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2799
2800 sum->InOctetsValidated += tmp.InOctetsValidated;
2801 sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
2802 sum->InPktsUnchecked += tmp.InPktsUnchecked;
2803 sum->InPktsDelayed += tmp.InPktsDelayed;
2804 sum->InPktsOK += tmp.InPktsOK;
2805 sum->InPktsInvalid += tmp.InPktsInvalid;
2806 sum->InPktsLate += tmp.InPktsLate;
2807 sum->InPktsNotValid += tmp.InPktsNotValid;
2808 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2809 sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
2810 }
2811 }
2812
copy_rx_sc_stats(struct sk_buff * skb,struct macsec_rx_sc_stats * sum)2813 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
2814 {
2815 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2816 sum->InOctetsValidated,
2817 MACSEC_RXSC_STATS_ATTR_PAD) ||
2818 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2819 sum->InOctetsDecrypted,
2820 MACSEC_RXSC_STATS_ATTR_PAD) ||
2821 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2822 sum->InPktsUnchecked,
2823 MACSEC_RXSC_STATS_ATTR_PAD) ||
2824 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2825 sum->InPktsDelayed,
2826 MACSEC_RXSC_STATS_ATTR_PAD) ||
2827 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2828 sum->InPktsOK,
2829 MACSEC_RXSC_STATS_ATTR_PAD) ||
2830 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2831 sum->InPktsInvalid,
2832 MACSEC_RXSC_STATS_ATTR_PAD) ||
2833 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2834 sum->InPktsLate,
2835 MACSEC_RXSC_STATS_ATTR_PAD) ||
2836 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2837 sum->InPktsNotValid,
2838 MACSEC_RXSC_STATS_ATTR_PAD) ||
2839 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2840 sum->InPktsNotUsingSA,
2841 MACSEC_RXSC_STATS_ATTR_PAD) ||
2842 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2843 sum->InPktsUnusedSA,
2844 MACSEC_RXSC_STATS_ATTR_PAD))
2845 return -EMSGSIZE;
2846
2847 return 0;
2848 }
2849
get_tx_sc_stats(struct net_device * dev,struct macsec_tx_sc_stats * sum)2850 static void get_tx_sc_stats(struct net_device *dev,
2851 struct macsec_tx_sc_stats *sum)
2852 {
2853 struct macsec_dev *macsec = macsec_priv(dev);
2854 int cpu;
2855
2856 /* If h/w offloading is available, propagate to the device */
2857 if (macsec_is_offloaded(macsec)) {
2858 const struct macsec_ops *ops;
2859 struct macsec_context ctx;
2860
2861 ops = macsec_get_ops(macsec, &ctx);
2862 if (ops) {
2863 ctx.stats.tx_sc_stats = sum;
2864 ctx.secy = &macsec_priv(dev)->secy;
2865 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
2866 }
2867 return;
2868 }
2869
2870 for_each_possible_cpu(cpu) {
2871 const struct pcpu_tx_sc_stats *stats;
2872 struct macsec_tx_sc_stats tmp;
2873 unsigned int start;
2874
2875 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
2876 do {
2877 start = u64_stats_fetch_begin_irq(&stats->syncp);
2878 memcpy(&tmp, &stats->stats, sizeof(tmp));
2879 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2880
2881 sum->OutPktsProtected += tmp.OutPktsProtected;
2882 sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
2883 sum->OutOctetsProtected += tmp.OutOctetsProtected;
2884 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2885 }
2886 }
2887
copy_tx_sc_stats(struct sk_buff * skb,struct macsec_tx_sc_stats * sum)2888 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
2889 {
2890 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2891 sum->OutPktsProtected,
2892 MACSEC_TXSC_STATS_ATTR_PAD) ||
2893 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2894 sum->OutPktsEncrypted,
2895 MACSEC_TXSC_STATS_ATTR_PAD) ||
2896 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2897 sum->OutOctetsProtected,
2898 MACSEC_TXSC_STATS_ATTR_PAD) ||
2899 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2900 sum->OutOctetsEncrypted,
2901 MACSEC_TXSC_STATS_ATTR_PAD))
2902 return -EMSGSIZE;
2903
2904 return 0;
2905 }
2906
get_secy_stats(struct net_device * dev,struct macsec_dev_stats * sum)2907 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
2908 {
2909 struct macsec_dev *macsec = macsec_priv(dev);
2910 int cpu;
2911
2912 /* If h/w offloading is available, propagate to the device */
2913 if (macsec_is_offloaded(macsec)) {
2914 const struct macsec_ops *ops;
2915 struct macsec_context ctx;
2916
2917 ops = macsec_get_ops(macsec, &ctx);
2918 if (ops) {
2919 ctx.stats.dev_stats = sum;
2920 ctx.secy = &macsec_priv(dev)->secy;
2921 macsec_offload(ops->mdo_get_dev_stats, &ctx);
2922 }
2923 return;
2924 }
2925
2926 for_each_possible_cpu(cpu) {
2927 const struct pcpu_secy_stats *stats;
2928 struct macsec_dev_stats tmp;
2929 unsigned int start;
2930
2931 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
2932 do {
2933 start = u64_stats_fetch_begin_irq(&stats->syncp);
2934 memcpy(&tmp, &stats->stats, sizeof(tmp));
2935 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2936
2937 sum->OutPktsUntagged += tmp.OutPktsUntagged;
2938 sum->InPktsUntagged += tmp.InPktsUntagged;
2939 sum->OutPktsTooLong += tmp.OutPktsTooLong;
2940 sum->InPktsNoTag += tmp.InPktsNoTag;
2941 sum->InPktsBadTag += tmp.InPktsBadTag;
2942 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2943 sum->InPktsNoSCI += tmp.InPktsNoSCI;
2944 sum->InPktsOverrun += tmp.InPktsOverrun;
2945 }
2946 }
2947
copy_secy_stats(struct sk_buff * skb,struct macsec_dev_stats * sum)2948 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
2949 {
2950 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2951 sum->OutPktsUntagged,
2952 MACSEC_SECY_STATS_ATTR_PAD) ||
2953 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2954 sum->InPktsUntagged,
2955 MACSEC_SECY_STATS_ATTR_PAD) ||
2956 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2957 sum->OutPktsTooLong,
2958 MACSEC_SECY_STATS_ATTR_PAD) ||
2959 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2960 sum->InPktsNoTag,
2961 MACSEC_SECY_STATS_ATTR_PAD) ||
2962 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2963 sum->InPktsBadTag,
2964 MACSEC_SECY_STATS_ATTR_PAD) ||
2965 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2966 sum->InPktsUnknownSCI,
2967 MACSEC_SECY_STATS_ATTR_PAD) ||
2968 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2969 sum->InPktsNoSCI,
2970 MACSEC_SECY_STATS_ATTR_PAD) ||
2971 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2972 sum->InPktsOverrun,
2973 MACSEC_SECY_STATS_ATTR_PAD))
2974 return -EMSGSIZE;
2975
2976 return 0;
2977 }
2978
nla_put_secy(struct macsec_secy * secy,struct sk_buff * skb)2979 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2980 {
2981 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2982 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
2983 MACSEC_ATTR_SECY);
2984 u64 csid;
2985
2986 if (!secy_nest)
2987 return 1;
2988
2989 switch (secy->key_len) {
2990 case MACSEC_GCM_AES_128_SAK_LEN:
2991 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
2992 break;
2993 case MACSEC_GCM_AES_256_SAK_LEN:
2994 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
2995 break;
2996 default:
2997 goto cancel;
2998 }
2999
3000 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
3001 MACSEC_SECY_ATTR_PAD) ||
3002 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
3003 csid, MACSEC_SECY_ATTR_PAD) ||
3004 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
3005 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
3006 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
3007 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
3008 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
3009 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
3010 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
3011 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
3012 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
3013 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
3014 goto cancel;
3015
3016 if (secy->replay_protect) {
3017 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
3018 goto cancel;
3019 }
3020
3021 nla_nest_end(skb, secy_nest);
3022 return 0;
3023
3024 cancel:
3025 nla_nest_cancel(skb, secy_nest);
3026 return 1;
3027 }
3028
3029 static noinline_for_stack int
dump_secy(struct macsec_secy * secy,struct net_device * dev,struct sk_buff * skb,struct netlink_callback * cb)3030 dump_secy(struct macsec_secy *secy, struct net_device *dev,
3031 struct sk_buff *skb, struct netlink_callback *cb)
3032 {
3033 struct macsec_tx_sc_stats tx_sc_stats = {0, };
3034 struct macsec_tx_sa_stats tx_sa_stats = {0, };
3035 struct macsec_rx_sc_stats rx_sc_stats = {0, };
3036 struct macsec_rx_sa_stats rx_sa_stats = {0, };
3037 struct macsec_dev *macsec = netdev_priv(dev);
3038 struct macsec_dev_stats dev_stats = {0, };
3039 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3040 struct nlattr *txsa_list, *rxsc_list;
3041 struct macsec_rx_sc *rx_sc;
3042 struct nlattr *attr;
3043 void *hdr;
3044 int i, j;
3045
3046 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3047 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
3048 if (!hdr)
3049 return -EMSGSIZE;
3050
3051 genl_dump_check_consistent(cb, hdr);
3052
3053 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
3054 goto nla_put_failure;
3055
3056 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
3057 if (!attr)
3058 goto nla_put_failure;
3059 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
3060 goto nla_put_failure;
3061 nla_nest_end(skb, attr);
3062
3063 if (nla_put_secy(secy, skb))
3064 goto nla_put_failure;
3065
3066 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
3067 if (!attr)
3068 goto nla_put_failure;
3069
3070 get_tx_sc_stats(dev, &tx_sc_stats);
3071 if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
3072 nla_nest_cancel(skb, attr);
3073 goto nla_put_failure;
3074 }
3075 nla_nest_end(skb, attr);
3076
3077 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
3078 if (!attr)
3079 goto nla_put_failure;
3080 get_secy_stats(dev, &dev_stats);
3081 if (copy_secy_stats(skb, &dev_stats)) {
3082 nla_nest_cancel(skb, attr);
3083 goto nla_put_failure;
3084 }
3085 nla_nest_end(skb, attr);
3086
3087 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
3088 if (!txsa_list)
3089 goto nla_put_failure;
3090 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
3091 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
3092 struct nlattr *txsa_nest;
3093 u64 pn;
3094 int pn_len;
3095
3096 if (!tx_sa)
3097 continue;
3098
3099 txsa_nest = nla_nest_start_noflag(skb, j++);
3100 if (!txsa_nest) {
3101 nla_nest_cancel(skb, txsa_list);
3102 goto nla_put_failure;
3103 }
3104
3105 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
3106 if (!attr) {
3107 nla_nest_cancel(skb, txsa_nest);
3108 nla_nest_cancel(skb, txsa_list);
3109 goto nla_put_failure;
3110 }
3111 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
3112 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
3113 if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
3114 nla_nest_cancel(skb, attr);
3115 nla_nest_cancel(skb, txsa_nest);
3116 nla_nest_cancel(skb, txsa_list);
3117 goto nla_put_failure;
3118 }
3119 nla_nest_end(skb, attr);
3120
3121 if (secy->xpn) {
3122 pn = tx_sa->next_pn;
3123 pn_len = MACSEC_XPN_PN_LEN;
3124 } else {
3125 pn = tx_sa->next_pn_halves.lower;
3126 pn_len = MACSEC_DEFAULT_PN_LEN;
3127 }
3128
3129 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3130 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3131 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
3132 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
3133 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
3134 nla_nest_cancel(skb, txsa_nest);
3135 nla_nest_cancel(skb, txsa_list);
3136 goto nla_put_failure;
3137 }
3138
3139 nla_nest_end(skb, txsa_nest);
3140 }
3141 nla_nest_end(skb, txsa_list);
3142
3143 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
3144 if (!rxsc_list)
3145 goto nla_put_failure;
3146
3147 j = 1;
3148 for_each_rxsc_rtnl(secy, rx_sc) {
3149 int k;
3150 struct nlattr *rxsa_list;
3151 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
3152
3153 if (!rxsc_nest) {
3154 nla_nest_cancel(skb, rxsc_list);
3155 goto nla_put_failure;
3156 }
3157
3158 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
3159 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
3160 MACSEC_RXSC_ATTR_PAD)) {
3161 nla_nest_cancel(skb, rxsc_nest);
3162 nla_nest_cancel(skb, rxsc_list);
3163 goto nla_put_failure;
3164 }
3165
3166 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
3167 if (!attr) {
3168 nla_nest_cancel(skb, rxsc_nest);
3169 nla_nest_cancel(skb, rxsc_list);
3170 goto nla_put_failure;
3171 }
3172 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
3173 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
3174 if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
3175 nla_nest_cancel(skb, attr);
3176 nla_nest_cancel(skb, rxsc_nest);
3177 nla_nest_cancel(skb, rxsc_list);
3178 goto nla_put_failure;
3179 }
3180 nla_nest_end(skb, attr);
3181
3182 rxsa_list = nla_nest_start_noflag(skb,
3183 MACSEC_RXSC_ATTR_SA_LIST);
3184 if (!rxsa_list) {
3185 nla_nest_cancel(skb, rxsc_nest);
3186 nla_nest_cancel(skb, rxsc_list);
3187 goto nla_put_failure;
3188 }
3189
3190 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
3191 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
3192 struct nlattr *rxsa_nest;
3193 u64 pn;
3194 int pn_len;
3195
3196 if (!rx_sa)
3197 continue;
3198
3199 rxsa_nest = nla_nest_start_noflag(skb, k++);
3200 if (!rxsa_nest) {
3201 nla_nest_cancel(skb, rxsa_list);
3202 nla_nest_cancel(skb, rxsc_nest);
3203 nla_nest_cancel(skb, rxsc_list);
3204 goto nla_put_failure;
3205 }
3206
3207 attr = nla_nest_start_noflag(skb,
3208 MACSEC_SA_ATTR_STATS);
3209 if (!attr) {
3210 nla_nest_cancel(skb, rxsa_list);
3211 nla_nest_cancel(skb, rxsc_nest);
3212 nla_nest_cancel(skb, rxsc_list);
3213 goto nla_put_failure;
3214 }
3215 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
3216 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
3217 if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
3218 nla_nest_cancel(skb, attr);
3219 nla_nest_cancel(skb, rxsa_list);
3220 nla_nest_cancel(skb, rxsc_nest);
3221 nla_nest_cancel(skb, rxsc_list);
3222 goto nla_put_failure;
3223 }
3224 nla_nest_end(skb, attr);
3225
3226 if (secy->xpn) {
3227 pn = rx_sa->next_pn;
3228 pn_len = MACSEC_XPN_PN_LEN;
3229 } else {
3230 pn = rx_sa->next_pn_halves.lower;
3231 pn_len = MACSEC_DEFAULT_PN_LEN;
3232 }
3233
3234 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3235 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3236 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
3237 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
3238 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
3239 nla_nest_cancel(skb, rxsa_nest);
3240 nla_nest_cancel(skb, rxsc_nest);
3241 nla_nest_cancel(skb, rxsc_list);
3242 goto nla_put_failure;
3243 }
3244 nla_nest_end(skb, rxsa_nest);
3245 }
3246
3247 nla_nest_end(skb, rxsa_list);
3248 nla_nest_end(skb, rxsc_nest);
3249 }
3250
3251 nla_nest_end(skb, rxsc_list);
3252
3253 genlmsg_end(skb, hdr);
3254
3255 return 0;
3256
3257 nla_put_failure:
3258 genlmsg_cancel(skb, hdr);
3259 return -EMSGSIZE;
3260 }
3261
3262 static int macsec_generation = 1; /* protected by RTNL */
3263
macsec_dump_txsc(struct sk_buff * skb,struct netlink_callback * cb)3264 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
3265 {
3266 struct net *net = sock_net(skb->sk);
3267 struct net_device *dev;
3268 int dev_idx, d;
3269
3270 dev_idx = cb->args[0];
3271
3272 d = 0;
3273 rtnl_lock();
3274
3275 cb->seq = macsec_generation;
3276
3277 for_each_netdev(net, dev) {
3278 struct macsec_secy *secy;
3279
3280 if (d < dev_idx)
3281 goto next;
3282
3283 if (!netif_is_macsec(dev))
3284 goto next;
3285
3286 secy = &macsec_priv(dev)->secy;
3287 if (dump_secy(secy, dev, skb, cb) < 0)
3288 goto done;
3289 next:
3290 d++;
3291 }
3292
3293 done:
3294 rtnl_unlock();
3295 cb->args[0] = d;
3296 return skb->len;
3297 }
3298
3299 static const struct genl_small_ops macsec_genl_ops[] = {
3300 {
3301 .cmd = MACSEC_CMD_GET_TXSC,
3302 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3303 .dumpit = macsec_dump_txsc,
3304 },
3305 {
3306 .cmd = MACSEC_CMD_ADD_RXSC,
3307 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3308 .doit = macsec_add_rxsc,
3309 .flags = GENL_ADMIN_PERM,
3310 },
3311 {
3312 .cmd = MACSEC_CMD_DEL_RXSC,
3313 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3314 .doit = macsec_del_rxsc,
3315 .flags = GENL_ADMIN_PERM,
3316 },
3317 {
3318 .cmd = MACSEC_CMD_UPD_RXSC,
3319 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3320 .doit = macsec_upd_rxsc,
3321 .flags = GENL_ADMIN_PERM,
3322 },
3323 {
3324 .cmd = MACSEC_CMD_ADD_TXSA,
3325 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3326 .doit = macsec_add_txsa,
3327 .flags = GENL_ADMIN_PERM,
3328 },
3329 {
3330 .cmd = MACSEC_CMD_DEL_TXSA,
3331 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3332 .doit = macsec_del_txsa,
3333 .flags = GENL_ADMIN_PERM,
3334 },
3335 {
3336 .cmd = MACSEC_CMD_UPD_TXSA,
3337 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3338 .doit = macsec_upd_txsa,
3339 .flags = GENL_ADMIN_PERM,
3340 },
3341 {
3342 .cmd = MACSEC_CMD_ADD_RXSA,
3343 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3344 .doit = macsec_add_rxsa,
3345 .flags = GENL_ADMIN_PERM,
3346 },
3347 {
3348 .cmd = MACSEC_CMD_DEL_RXSA,
3349 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3350 .doit = macsec_del_rxsa,
3351 .flags = GENL_ADMIN_PERM,
3352 },
3353 {
3354 .cmd = MACSEC_CMD_UPD_RXSA,
3355 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3356 .doit = macsec_upd_rxsa,
3357 .flags = GENL_ADMIN_PERM,
3358 },
3359 {
3360 .cmd = MACSEC_CMD_UPD_OFFLOAD,
3361 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3362 .doit = macsec_upd_offload,
3363 .flags = GENL_ADMIN_PERM,
3364 },
3365 };
3366
3367 static struct genl_family macsec_fam __ro_after_init = {
3368 .name = MACSEC_GENL_NAME,
3369 .hdrsize = 0,
3370 .version = MACSEC_GENL_VERSION,
3371 .maxattr = MACSEC_ATTR_MAX,
3372 .policy = macsec_genl_policy,
3373 .netnsok = true,
3374 .module = THIS_MODULE,
3375 .small_ops = macsec_genl_ops,
3376 .n_small_ops = ARRAY_SIZE(macsec_genl_ops),
3377 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1,
3378 };
3379
macsec_start_xmit(struct sk_buff * skb,struct net_device * dev)3380 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3381 struct net_device *dev)
3382 {
3383 struct macsec_dev *macsec = netdev_priv(dev);
3384 struct macsec_secy *secy = &macsec->secy;
3385 struct pcpu_secy_stats *secy_stats;
3386 int ret, len;
3387
3388 if (macsec_is_offloaded(netdev_priv(dev))) {
3389 struct metadata_dst *md_dst = secy->tx_sc.md_dst;
3390
3391 skb_dst_drop(skb);
3392 dst_hold(&md_dst->dst);
3393 skb_dst_set(skb, &md_dst->dst);
3394 skb->dev = macsec->real_dev;
3395 return dev_queue_xmit(skb);
3396 }
3397
3398 /* 10.5 */
3399 if (!secy->protect_frames) {
3400 secy_stats = this_cpu_ptr(macsec->stats);
3401 u64_stats_update_begin(&secy_stats->syncp);
3402 secy_stats->stats.OutPktsUntagged++;
3403 u64_stats_update_end(&secy_stats->syncp);
3404 skb->dev = macsec->real_dev;
3405 len = skb->len;
3406 ret = dev_queue_xmit(skb);
3407 count_tx(dev, ret, len);
3408 return ret;
3409 }
3410
3411 if (!secy->operational) {
3412 kfree_skb(skb);
3413 dev->stats.tx_dropped++;
3414 return NETDEV_TX_OK;
3415 }
3416
3417 len = skb->len;
3418 skb = macsec_encrypt(skb, dev);
3419 if (IS_ERR(skb)) {
3420 if (PTR_ERR(skb) != -EINPROGRESS)
3421 dev->stats.tx_dropped++;
3422 return NETDEV_TX_OK;
3423 }
3424
3425 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3426
3427 macsec_encrypt_finish(skb, dev);
3428 ret = dev_queue_xmit(skb);
3429 count_tx(dev, ret, len);
3430 return ret;
3431 }
3432
3433 #define MACSEC_FEATURES \
3434 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3435
macsec_dev_init(struct net_device * dev)3436 static int macsec_dev_init(struct net_device *dev)
3437 {
3438 struct macsec_dev *macsec = macsec_priv(dev);
3439 struct net_device *real_dev = macsec->real_dev;
3440 int err;
3441
3442 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3443 if (!dev->tstats)
3444 return -ENOMEM;
3445
3446 err = gro_cells_init(&macsec->gro_cells, dev);
3447 if (err) {
3448 free_percpu(dev->tstats);
3449 return err;
3450 }
3451
3452 dev->features = real_dev->features & MACSEC_FEATURES;
3453 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
3454
3455 dev->needed_headroom = real_dev->needed_headroom +
3456 MACSEC_NEEDED_HEADROOM;
3457 dev->needed_tailroom = real_dev->needed_tailroom +
3458 MACSEC_NEEDED_TAILROOM;
3459
3460 if (is_zero_ether_addr(dev->dev_addr))
3461 eth_hw_addr_inherit(dev, real_dev);
3462 if (is_zero_ether_addr(dev->broadcast))
3463 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3464
3465 /* Get macsec's reference to real_dev */
3466 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL);
3467
3468 return 0;
3469 }
3470
macsec_dev_uninit(struct net_device * dev)3471 static void macsec_dev_uninit(struct net_device *dev)
3472 {
3473 struct macsec_dev *macsec = macsec_priv(dev);
3474
3475 gro_cells_destroy(&macsec->gro_cells);
3476 free_percpu(dev->tstats);
3477 }
3478
macsec_fix_features(struct net_device * dev,netdev_features_t features)3479 static netdev_features_t macsec_fix_features(struct net_device *dev,
3480 netdev_features_t features)
3481 {
3482 struct macsec_dev *macsec = macsec_priv(dev);
3483 struct net_device *real_dev = macsec->real_dev;
3484
3485 features &= (real_dev->features & MACSEC_FEATURES) |
3486 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3487 features |= NETIF_F_LLTX;
3488
3489 return features;
3490 }
3491
macsec_dev_open(struct net_device * dev)3492 static int macsec_dev_open(struct net_device *dev)
3493 {
3494 struct macsec_dev *macsec = macsec_priv(dev);
3495 struct net_device *real_dev = macsec->real_dev;
3496 int err;
3497
3498 err = dev_uc_add(real_dev, dev->dev_addr);
3499 if (err < 0)
3500 return err;
3501
3502 if (dev->flags & IFF_ALLMULTI) {
3503 err = dev_set_allmulti(real_dev, 1);
3504 if (err < 0)
3505 goto del_unicast;
3506 }
3507
3508 if (dev->flags & IFF_PROMISC) {
3509 err = dev_set_promiscuity(real_dev, 1);
3510 if (err < 0)
3511 goto clear_allmulti;
3512 }
3513
3514 /* If h/w offloading is available, propagate to the device */
3515 if (macsec_is_offloaded(macsec)) {
3516 const struct macsec_ops *ops;
3517 struct macsec_context ctx;
3518
3519 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3520 if (!ops) {
3521 err = -EOPNOTSUPP;
3522 goto clear_allmulti;
3523 }
3524
3525 ctx.secy = &macsec->secy;
3526 err = macsec_offload(ops->mdo_dev_open, &ctx);
3527 if (err)
3528 goto clear_allmulti;
3529 }
3530
3531 if (netif_carrier_ok(real_dev))
3532 netif_carrier_on(dev);
3533
3534 return 0;
3535 clear_allmulti:
3536 if (dev->flags & IFF_ALLMULTI)
3537 dev_set_allmulti(real_dev, -1);
3538 del_unicast:
3539 dev_uc_del(real_dev, dev->dev_addr);
3540 netif_carrier_off(dev);
3541 return err;
3542 }
3543
macsec_dev_stop(struct net_device * dev)3544 static int macsec_dev_stop(struct net_device *dev)
3545 {
3546 struct macsec_dev *macsec = macsec_priv(dev);
3547 struct net_device *real_dev = macsec->real_dev;
3548
3549 netif_carrier_off(dev);
3550
3551 /* If h/w offloading is available, propagate to the device */
3552 if (macsec_is_offloaded(macsec)) {
3553 const struct macsec_ops *ops;
3554 struct macsec_context ctx;
3555
3556 ops = macsec_get_ops(macsec, &ctx);
3557 if (ops) {
3558 ctx.secy = &macsec->secy;
3559 macsec_offload(ops->mdo_dev_stop, &ctx);
3560 }
3561 }
3562
3563 dev_mc_unsync(real_dev, dev);
3564 dev_uc_unsync(real_dev, dev);
3565
3566 if (dev->flags & IFF_ALLMULTI)
3567 dev_set_allmulti(real_dev, -1);
3568
3569 if (dev->flags & IFF_PROMISC)
3570 dev_set_promiscuity(real_dev, -1);
3571
3572 dev_uc_del(real_dev, dev->dev_addr);
3573
3574 return 0;
3575 }
3576
macsec_dev_change_rx_flags(struct net_device * dev,int change)3577 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3578 {
3579 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3580
3581 if (!(dev->flags & IFF_UP))
3582 return;
3583
3584 if (change & IFF_ALLMULTI)
3585 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3586
3587 if (change & IFF_PROMISC)
3588 dev_set_promiscuity(real_dev,
3589 dev->flags & IFF_PROMISC ? 1 : -1);
3590 }
3591
macsec_dev_set_rx_mode(struct net_device * dev)3592 static void macsec_dev_set_rx_mode(struct net_device *dev)
3593 {
3594 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3595
3596 dev_mc_sync(real_dev, dev);
3597 dev_uc_sync(real_dev, dev);
3598 }
3599
macsec_set_mac_address(struct net_device * dev,void * p)3600 static int macsec_set_mac_address(struct net_device *dev, void *p)
3601 {
3602 struct macsec_dev *macsec = macsec_priv(dev);
3603 struct net_device *real_dev = macsec->real_dev;
3604 struct sockaddr *addr = p;
3605 int err;
3606
3607 if (!is_valid_ether_addr(addr->sa_data))
3608 return -EADDRNOTAVAIL;
3609
3610 if (!(dev->flags & IFF_UP))
3611 goto out;
3612
3613 err = dev_uc_add(real_dev, addr->sa_data);
3614 if (err < 0)
3615 return err;
3616
3617 dev_uc_del(real_dev, dev->dev_addr);
3618
3619 out:
3620 eth_hw_addr_set(dev, addr->sa_data);
3621
3622 /* If h/w offloading is available, propagate to the device */
3623 if (macsec_is_offloaded(macsec)) {
3624 const struct macsec_ops *ops;
3625 struct macsec_context ctx;
3626
3627 ops = macsec_get_ops(macsec, &ctx);
3628 if (ops) {
3629 ctx.secy = &macsec->secy;
3630 macsec_offload(ops->mdo_upd_secy, &ctx);
3631 }
3632 }
3633
3634 return 0;
3635 }
3636
macsec_change_mtu(struct net_device * dev,int new_mtu)3637 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3638 {
3639 struct macsec_dev *macsec = macsec_priv(dev);
3640 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3641
3642 if (macsec->real_dev->mtu - extra < new_mtu)
3643 return -ERANGE;
3644
3645 dev->mtu = new_mtu;
3646
3647 return 0;
3648 }
3649
macsec_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * s)3650 static void macsec_get_stats64(struct net_device *dev,
3651 struct rtnl_link_stats64 *s)
3652 {
3653 if (!dev->tstats)
3654 return;
3655
3656 dev_fetch_sw_netstats(s, dev->tstats);
3657
3658 s->rx_dropped = dev->stats.rx_dropped;
3659 s->tx_dropped = dev->stats.tx_dropped;
3660 s->rx_errors = dev->stats.rx_errors;
3661 }
3662
macsec_get_iflink(const struct net_device * dev)3663 static int macsec_get_iflink(const struct net_device *dev)
3664 {
3665 return macsec_priv(dev)->real_dev->ifindex;
3666 }
3667
3668 static const struct net_device_ops macsec_netdev_ops = {
3669 .ndo_init = macsec_dev_init,
3670 .ndo_uninit = macsec_dev_uninit,
3671 .ndo_open = macsec_dev_open,
3672 .ndo_stop = macsec_dev_stop,
3673 .ndo_fix_features = macsec_fix_features,
3674 .ndo_change_mtu = macsec_change_mtu,
3675 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
3676 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
3677 .ndo_set_mac_address = macsec_set_mac_address,
3678 .ndo_start_xmit = macsec_start_xmit,
3679 .ndo_get_stats64 = macsec_get_stats64,
3680 .ndo_get_iflink = macsec_get_iflink,
3681 };
3682
3683 static const struct device_type macsec_type = {
3684 .name = "macsec",
3685 };
3686
3687 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3688 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3689 [IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3690 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3691 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3692 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3693 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3694 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3695 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3696 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3697 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3698 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3699 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3700 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3701 [IFLA_MACSEC_OFFLOAD] = { .type = NLA_U8 },
3702 };
3703
macsec_free_netdev(struct net_device * dev)3704 static void macsec_free_netdev(struct net_device *dev)
3705 {
3706 struct macsec_dev *macsec = macsec_priv(dev);
3707
3708 if (macsec->secy.tx_sc.md_dst)
3709 metadata_dst_free(macsec->secy.tx_sc.md_dst);
3710 free_percpu(macsec->stats);
3711 free_percpu(macsec->secy.tx_sc.stats);
3712
3713 /* Get rid of the macsec's reference to real_dev */
3714 netdev_put(macsec->real_dev, &macsec->dev_tracker);
3715 }
3716
macsec_setup(struct net_device * dev)3717 static void macsec_setup(struct net_device *dev)
3718 {
3719 ether_setup(dev);
3720 dev->min_mtu = 0;
3721 dev->max_mtu = ETH_MAX_MTU;
3722 dev->priv_flags |= IFF_NO_QUEUE;
3723 dev->netdev_ops = &macsec_netdev_ops;
3724 dev->needs_free_netdev = true;
3725 dev->priv_destructor = macsec_free_netdev;
3726 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3727
3728 eth_zero_addr(dev->broadcast);
3729 }
3730
macsec_changelink_common(struct net_device * dev,struct nlattr * data[])3731 static int macsec_changelink_common(struct net_device *dev,
3732 struct nlattr *data[])
3733 {
3734 struct macsec_secy *secy;
3735 struct macsec_tx_sc *tx_sc;
3736
3737 secy = &macsec_priv(dev)->secy;
3738 tx_sc = &secy->tx_sc;
3739
3740 if (data[IFLA_MACSEC_ENCODING_SA]) {
3741 struct macsec_tx_sa *tx_sa;
3742
3743 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3744 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3745
3746 secy->operational = tx_sa && tx_sa->active;
3747 }
3748
3749 if (data[IFLA_MACSEC_ENCRYPT])
3750 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3751
3752 if (data[IFLA_MACSEC_PROTECT])
3753 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3754
3755 if (data[IFLA_MACSEC_INC_SCI])
3756 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3757
3758 if (data[IFLA_MACSEC_ES])
3759 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3760
3761 if (data[IFLA_MACSEC_SCB])
3762 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3763
3764 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3765 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3766
3767 if (data[IFLA_MACSEC_VALIDATION])
3768 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3769
3770 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3771 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3772 case MACSEC_CIPHER_ID_GCM_AES_128:
3773 case MACSEC_DEFAULT_CIPHER_ID:
3774 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3775 secy->xpn = false;
3776 break;
3777 case MACSEC_CIPHER_ID_GCM_AES_256:
3778 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3779 secy->xpn = false;
3780 break;
3781 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
3782 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3783 secy->xpn = true;
3784 break;
3785 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
3786 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3787 secy->xpn = true;
3788 break;
3789 default:
3790 return -EINVAL;
3791 }
3792 }
3793
3794 if (data[IFLA_MACSEC_WINDOW]) {
3795 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3796
3797 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window
3798 * for XPN cipher suites */
3799 if (secy->xpn &&
3800 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW)
3801 return -EINVAL;
3802 }
3803
3804 return 0;
3805 }
3806
macsec_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)3807 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3808 struct nlattr *data[],
3809 struct netlink_ext_ack *extack)
3810 {
3811 struct macsec_dev *macsec = macsec_priv(dev);
3812 struct macsec_tx_sc tx_sc;
3813 struct macsec_secy secy;
3814 int ret;
3815
3816 if (!data)
3817 return 0;
3818
3819 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3820 data[IFLA_MACSEC_ICV_LEN] ||
3821 data[IFLA_MACSEC_SCI] ||
3822 data[IFLA_MACSEC_PORT])
3823 return -EINVAL;
3824
3825 /* Keep a copy of unmodified secy and tx_sc, in case the offload
3826 * propagation fails, to revert macsec_changelink_common.
3827 */
3828 memcpy(&secy, &macsec->secy, sizeof(secy));
3829 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3830
3831 ret = macsec_changelink_common(dev, data);
3832 if (ret)
3833 goto cleanup;
3834
3835 /* If h/w offloading is available, propagate to the device */
3836 if (macsec_is_offloaded(macsec)) {
3837 const struct macsec_ops *ops;
3838 struct macsec_context ctx;
3839
3840 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3841 if (!ops) {
3842 ret = -EOPNOTSUPP;
3843 goto cleanup;
3844 }
3845
3846 ctx.secy = &macsec->secy;
3847 ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3848 if (ret)
3849 goto cleanup;
3850 }
3851
3852 return 0;
3853
3854 cleanup:
3855 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3856 memcpy(&macsec->secy, &secy, sizeof(secy));
3857
3858 return ret;
3859 }
3860
macsec_del_dev(struct macsec_dev * macsec)3861 static void macsec_del_dev(struct macsec_dev *macsec)
3862 {
3863 int i;
3864
3865 while (macsec->secy.rx_sc) {
3866 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3867
3868 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3869 free_rx_sc(rx_sc);
3870 }
3871
3872 for (i = 0; i < MACSEC_NUM_AN; i++) {
3873 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3874
3875 if (sa) {
3876 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3877 clear_tx_sa(sa);
3878 }
3879 }
3880 }
3881
macsec_common_dellink(struct net_device * dev,struct list_head * head)3882 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3883 {
3884 struct macsec_dev *macsec = macsec_priv(dev);
3885 struct net_device *real_dev = macsec->real_dev;
3886
3887 /* If h/w offloading is available, propagate to the device */
3888 if (macsec_is_offloaded(macsec)) {
3889 const struct macsec_ops *ops;
3890 struct macsec_context ctx;
3891
3892 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3893 if (ops) {
3894 ctx.secy = &macsec->secy;
3895 macsec_offload(ops->mdo_del_secy, &ctx);
3896 }
3897 }
3898
3899 unregister_netdevice_queue(dev, head);
3900 list_del_rcu(&macsec->secys);
3901 macsec_del_dev(macsec);
3902 netdev_upper_dev_unlink(real_dev, dev);
3903
3904 macsec_generation++;
3905 }
3906
macsec_dellink(struct net_device * dev,struct list_head * head)3907 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3908 {
3909 struct macsec_dev *macsec = macsec_priv(dev);
3910 struct net_device *real_dev = macsec->real_dev;
3911 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3912
3913 macsec_common_dellink(dev, head);
3914
3915 if (list_empty(&rxd->secys)) {
3916 netdev_rx_handler_unregister(real_dev);
3917 kfree(rxd);
3918 }
3919 }
3920
register_macsec_dev(struct net_device * real_dev,struct net_device * dev)3921 static int register_macsec_dev(struct net_device *real_dev,
3922 struct net_device *dev)
3923 {
3924 struct macsec_dev *macsec = macsec_priv(dev);
3925 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3926
3927 if (!rxd) {
3928 int err;
3929
3930 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3931 if (!rxd)
3932 return -ENOMEM;
3933
3934 INIT_LIST_HEAD(&rxd->secys);
3935
3936 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3937 rxd);
3938 if (err < 0) {
3939 kfree(rxd);
3940 return err;
3941 }
3942 }
3943
3944 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3945 return 0;
3946 }
3947
sci_exists(struct net_device * dev,sci_t sci)3948 static bool sci_exists(struct net_device *dev, sci_t sci)
3949 {
3950 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3951 struct macsec_dev *macsec;
3952
3953 list_for_each_entry(macsec, &rxd->secys, secys) {
3954 if (macsec->secy.sci == sci)
3955 return true;
3956 }
3957
3958 return false;
3959 }
3960
dev_to_sci(struct net_device * dev,__be16 port)3961 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3962 {
3963 return make_sci(dev->dev_addr, port);
3964 }
3965
macsec_add_dev(struct net_device * dev,sci_t sci,u8 icv_len)3966 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3967 {
3968 struct macsec_dev *macsec = macsec_priv(dev);
3969 struct macsec_secy *secy = &macsec->secy;
3970
3971 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3972 if (!macsec->stats)
3973 return -ENOMEM;
3974
3975 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3976 if (!secy->tx_sc.stats) {
3977 free_percpu(macsec->stats);
3978 return -ENOMEM;
3979 }
3980
3981 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL);
3982 if (!secy->tx_sc.md_dst) {
3983 free_percpu(secy->tx_sc.stats);
3984 free_percpu(macsec->stats);
3985 return -ENOMEM;
3986 }
3987
3988 if (sci == MACSEC_UNDEF_SCI)
3989 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3990
3991 secy->netdev = dev;
3992 secy->operational = true;
3993 secy->key_len = DEFAULT_SAK_LEN;
3994 secy->icv_len = icv_len;
3995 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3996 secy->protect_frames = true;
3997 secy->replay_protect = false;
3998 secy->xpn = DEFAULT_XPN;
3999
4000 secy->sci = sci;
4001 secy->tx_sc.md_dst->u.macsec_info.sci = sci;
4002 secy->tx_sc.active = true;
4003 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
4004 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
4005 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
4006 secy->tx_sc.end_station = false;
4007 secy->tx_sc.scb = false;
4008
4009 return 0;
4010 }
4011
4012 static struct lock_class_key macsec_netdev_addr_lock_key;
4013
macsec_newlink(struct net * net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)4014 static int macsec_newlink(struct net *net, struct net_device *dev,
4015 struct nlattr *tb[], struct nlattr *data[],
4016 struct netlink_ext_ack *extack)
4017 {
4018 struct macsec_dev *macsec = macsec_priv(dev);
4019 rx_handler_func_t *rx_handler;
4020 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4021 struct net_device *real_dev;
4022 int err, mtu;
4023 sci_t sci;
4024
4025 if (!tb[IFLA_LINK])
4026 return -EINVAL;
4027 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
4028 if (!real_dev)
4029 return -ENODEV;
4030 if (real_dev->type != ARPHRD_ETHER)
4031 return -EINVAL;
4032
4033 dev->priv_flags |= IFF_MACSEC;
4034
4035 macsec->real_dev = real_dev;
4036
4037 if (data && data[IFLA_MACSEC_OFFLOAD])
4038 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
4039 else
4040 /* MACsec offloading is off by default */
4041 macsec->offload = MACSEC_OFFLOAD_OFF;
4042
4043 /* Check if the offloading mode is supported by the underlying layers */
4044 if (macsec->offload != MACSEC_OFFLOAD_OFF &&
4045 !macsec_check_offload(macsec->offload, macsec))
4046 return -EOPNOTSUPP;
4047
4048 /* send_sci must be set to true when transmit sci explicitly is set */
4049 if ((data && data[IFLA_MACSEC_SCI]) &&
4050 (data && data[IFLA_MACSEC_INC_SCI])) {
4051 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
4052
4053 if (!send_sci)
4054 return -EINVAL;
4055 }
4056
4057 if (data && data[IFLA_MACSEC_ICV_LEN])
4058 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4059 mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
4060 if (mtu < 0)
4061 dev->mtu = 0;
4062 else
4063 dev->mtu = mtu;
4064
4065 rx_handler = rtnl_dereference(real_dev->rx_handler);
4066 if (rx_handler && rx_handler != macsec_handle_frame)
4067 return -EBUSY;
4068
4069 err = register_netdevice(dev);
4070 if (err < 0)
4071 return err;
4072
4073 netdev_lockdep_set_classes(dev);
4074 lockdep_set_class(&dev->addr_list_lock,
4075 &macsec_netdev_addr_lock_key);
4076
4077 err = netdev_upper_dev_link(real_dev, dev, extack);
4078 if (err < 0)
4079 goto unregister;
4080
4081 /* need to be already registered so that ->init has run and
4082 * the MAC addr is set
4083 */
4084 if (data && data[IFLA_MACSEC_SCI])
4085 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
4086 else if (data && data[IFLA_MACSEC_PORT])
4087 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
4088 else
4089 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4090
4091 if (rx_handler && sci_exists(real_dev, sci)) {
4092 err = -EBUSY;
4093 goto unlink;
4094 }
4095
4096 err = macsec_add_dev(dev, sci, icv_len);
4097 if (err)
4098 goto unlink;
4099
4100 if (data) {
4101 err = macsec_changelink_common(dev, data);
4102 if (err)
4103 goto del_dev;
4104 }
4105
4106 /* If h/w offloading is available, propagate to the device */
4107 if (macsec_is_offloaded(macsec)) {
4108 const struct macsec_ops *ops;
4109 struct macsec_context ctx;
4110
4111 ops = macsec_get_ops(macsec, &ctx);
4112 if (ops) {
4113 ctx.secy = &macsec->secy;
4114 err = macsec_offload(ops->mdo_add_secy, &ctx);
4115 if (err)
4116 goto del_dev;
4117 }
4118 }
4119
4120 err = register_macsec_dev(real_dev, dev);
4121 if (err < 0)
4122 goto del_dev;
4123
4124 netif_stacked_transfer_operstate(real_dev, dev);
4125 linkwatch_fire_event(dev);
4126
4127 macsec_generation++;
4128
4129 return 0;
4130
4131 del_dev:
4132 macsec_del_dev(macsec);
4133 unlink:
4134 netdev_upper_dev_unlink(real_dev, dev);
4135 unregister:
4136 unregister_netdevice(dev);
4137 return err;
4138 }
4139
macsec_validate_attr(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)4140 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
4141 struct netlink_ext_ack *extack)
4142 {
4143 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
4144 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4145 int flag;
4146 bool es, scb, sci;
4147
4148 if (!data)
4149 return 0;
4150
4151 if (data[IFLA_MACSEC_CIPHER_SUITE])
4152 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
4153
4154 if (data[IFLA_MACSEC_ICV_LEN]) {
4155 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4156 if (icv_len != MACSEC_DEFAULT_ICV_LEN) {
4157 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
4158 struct crypto_aead *dummy_tfm;
4159
4160 dummy_tfm = macsec_alloc_tfm(dummy_key,
4161 DEFAULT_SAK_LEN,
4162 icv_len);
4163 if (IS_ERR(dummy_tfm))
4164 return PTR_ERR(dummy_tfm);
4165 crypto_free_aead(dummy_tfm);
4166 }
4167 }
4168
4169 switch (csid) {
4170 case MACSEC_CIPHER_ID_GCM_AES_128:
4171 case MACSEC_CIPHER_ID_GCM_AES_256:
4172 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
4173 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
4174 case MACSEC_DEFAULT_CIPHER_ID:
4175 if (icv_len < MACSEC_MIN_ICV_LEN ||
4176 icv_len > MACSEC_STD_ICV_LEN)
4177 return -EINVAL;
4178 break;
4179 default:
4180 return -EINVAL;
4181 }
4182
4183 if (data[IFLA_MACSEC_ENCODING_SA]) {
4184 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
4185 return -EINVAL;
4186 }
4187
4188 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
4189 flag < IFLA_MACSEC_VALIDATION;
4190 flag++) {
4191 if (data[flag]) {
4192 if (nla_get_u8(data[flag]) > 1)
4193 return -EINVAL;
4194 }
4195 }
4196
4197 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
4198 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
4199 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
4200
4201 if ((sci && (scb || es)) || (scb && es))
4202 return -EINVAL;
4203
4204 if (data[IFLA_MACSEC_VALIDATION] &&
4205 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
4206 return -EINVAL;
4207
4208 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
4209 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
4210 !data[IFLA_MACSEC_WINDOW])
4211 return -EINVAL;
4212
4213 return 0;
4214 }
4215
macsec_get_link_net(const struct net_device * dev)4216 static struct net *macsec_get_link_net(const struct net_device *dev)
4217 {
4218 return dev_net(macsec_priv(dev)->real_dev);
4219 }
4220
macsec_get_size(const struct net_device * dev)4221 static size_t macsec_get_size(const struct net_device *dev)
4222 {
4223 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
4224 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
4225 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
4226 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
4227 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
4228 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
4229 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
4230 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
4231 nla_total_size(1) + /* IFLA_MACSEC_ES */
4232 nla_total_size(1) + /* IFLA_MACSEC_SCB */
4233 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
4234 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
4235 0;
4236 }
4237
macsec_fill_info(struct sk_buff * skb,const struct net_device * dev)4238 static int macsec_fill_info(struct sk_buff *skb,
4239 const struct net_device *dev)
4240 {
4241 struct macsec_secy *secy = &macsec_priv(dev)->secy;
4242 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
4243 u64 csid;
4244
4245 switch (secy->key_len) {
4246 case MACSEC_GCM_AES_128_SAK_LEN:
4247 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
4248 break;
4249 case MACSEC_GCM_AES_256_SAK_LEN:
4250 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
4251 break;
4252 default:
4253 goto nla_put_failure;
4254 }
4255
4256 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
4257 IFLA_MACSEC_PAD) ||
4258 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
4259 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
4260 csid, IFLA_MACSEC_PAD) ||
4261 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
4262 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
4263 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
4264 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
4265 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
4266 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
4267 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
4268 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
4269 0)
4270 goto nla_put_failure;
4271
4272 if (secy->replay_protect) {
4273 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
4274 goto nla_put_failure;
4275 }
4276
4277 return 0;
4278
4279 nla_put_failure:
4280 return -EMSGSIZE;
4281 }
4282
4283 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
4284 .kind = "macsec",
4285 .priv_size = sizeof(struct macsec_dev),
4286 .maxtype = IFLA_MACSEC_MAX,
4287 .policy = macsec_rtnl_policy,
4288 .setup = macsec_setup,
4289 .validate = macsec_validate_attr,
4290 .newlink = macsec_newlink,
4291 .changelink = macsec_changelink,
4292 .dellink = macsec_dellink,
4293 .get_size = macsec_get_size,
4294 .fill_info = macsec_fill_info,
4295 .get_link_net = macsec_get_link_net,
4296 };
4297
is_macsec_master(struct net_device * dev)4298 static bool is_macsec_master(struct net_device *dev)
4299 {
4300 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
4301 }
4302
macsec_notify(struct notifier_block * this,unsigned long event,void * ptr)4303 static int macsec_notify(struct notifier_block *this, unsigned long event,
4304 void *ptr)
4305 {
4306 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
4307 LIST_HEAD(head);
4308
4309 if (!is_macsec_master(real_dev))
4310 return NOTIFY_DONE;
4311
4312 switch (event) {
4313 case NETDEV_DOWN:
4314 case NETDEV_UP:
4315 case NETDEV_CHANGE: {
4316 struct macsec_dev *m, *n;
4317 struct macsec_rxh_data *rxd;
4318
4319 rxd = macsec_data_rtnl(real_dev);
4320 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4321 struct net_device *dev = m->secy.netdev;
4322
4323 netif_stacked_transfer_operstate(real_dev, dev);
4324 }
4325 break;
4326 }
4327 case NETDEV_UNREGISTER: {
4328 struct macsec_dev *m, *n;
4329 struct macsec_rxh_data *rxd;
4330
4331 rxd = macsec_data_rtnl(real_dev);
4332 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4333 macsec_common_dellink(m->secy.netdev, &head);
4334 }
4335
4336 netdev_rx_handler_unregister(real_dev);
4337 kfree(rxd);
4338
4339 unregister_netdevice_many(&head);
4340 break;
4341 }
4342 case NETDEV_CHANGEMTU: {
4343 struct macsec_dev *m;
4344 struct macsec_rxh_data *rxd;
4345
4346 rxd = macsec_data_rtnl(real_dev);
4347 list_for_each_entry(m, &rxd->secys, secys) {
4348 struct net_device *dev = m->secy.netdev;
4349 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
4350 macsec_extra_len(true));
4351
4352 if (dev->mtu > mtu)
4353 dev_set_mtu(dev, mtu);
4354 }
4355 }
4356 }
4357
4358 return NOTIFY_OK;
4359 }
4360
4361 static struct notifier_block macsec_notifier = {
4362 .notifier_call = macsec_notify,
4363 };
4364
macsec_init(void)4365 static int __init macsec_init(void)
4366 {
4367 int err;
4368
4369 pr_info("MACsec IEEE 802.1AE\n");
4370 err = register_netdevice_notifier(&macsec_notifier);
4371 if (err)
4372 return err;
4373
4374 err = rtnl_link_register(&macsec_link_ops);
4375 if (err)
4376 goto notifier;
4377
4378 err = genl_register_family(&macsec_fam);
4379 if (err)
4380 goto rtnl;
4381
4382 return 0;
4383
4384 rtnl:
4385 rtnl_link_unregister(&macsec_link_ops);
4386 notifier:
4387 unregister_netdevice_notifier(&macsec_notifier);
4388 return err;
4389 }
4390
macsec_exit(void)4391 static void __exit macsec_exit(void)
4392 {
4393 genl_unregister_family(&macsec_fam);
4394 rtnl_link_unregister(&macsec_link_ops);
4395 unregister_netdevice_notifier(&macsec_notifier);
4396 rcu_barrier();
4397 }
4398
4399 module_init(macsec_init);
4400 module_exit(macsec_exit);
4401
4402 MODULE_ALIAS_RTNL_LINK("macsec");
4403 MODULE_ALIAS_GENL_FAMILY("macsec");
4404
4405 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
4406 MODULE_LICENSE("GPL v2");
4407
