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 DEV_STATS_INC(secy->netdev, 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 DEV_STATS_INC(secy->netdev, 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 DEV_STATS_INC(macsec->secy.netdev, 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 DEV_STATS_INC(secy->netdev, 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 DEV_STATS_INC(secy->netdev, 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 DEV_STATS_INC(macsec->secy.netdev, 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 DEV_STATS_INC(macsec->secy.netdev, 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 DEV_STATS_INC(macsec->secy.netdev, 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 DEV_STATS_INC(macsec->secy.netdev, 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 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1335
1336 if (IS_ERR(tfm))
1337 return tfm;
1338
1339 ret = crypto_aead_setkey(tfm, key, key_len);
1340 if (ret < 0)
1341 goto fail;
1342
1343 ret = crypto_aead_setauthsize(tfm, icv_len);
1344 if (ret < 0)
1345 goto fail;
1346
1347 return tfm;
1348 fail:
1349 crypto_free_aead(tfm);
1350 return ERR_PTR(ret);
1351 }
1352
init_rx_sa(struct macsec_rx_sa * rx_sa,char * sak,int key_len,int icv_len)1353 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1354 int icv_len)
1355 {
1356 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1357 if (!rx_sa->stats)
1358 return -ENOMEM;
1359
1360 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1361 if (IS_ERR(rx_sa->key.tfm)) {
1362 free_percpu(rx_sa->stats);
1363 return PTR_ERR(rx_sa->key.tfm);
1364 }
1365
1366 rx_sa->ssci = MACSEC_UNDEF_SSCI;
1367 rx_sa->active = false;
1368 rx_sa->next_pn = 1;
1369 refcount_set(&rx_sa->refcnt, 1);
1370 spin_lock_init(&rx_sa->lock);
1371
1372 return 0;
1373 }
1374
clear_rx_sa(struct macsec_rx_sa * rx_sa)1375 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1376 {
1377 rx_sa->active = false;
1378
1379 macsec_rxsa_put(rx_sa);
1380 }
1381
free_rx_sc(struct macsec_rx_sc * rx_sc)1382 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1383 {
1384 int i;
1385
1386 for (i = 0; i < MACSEC_NUM_AN; i++) {
1387 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1388
1389 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1390 if (sa)
1391 clear_rx_sa(sa);
1392 }
1393
1394 macsec_rxsc_put(rx_sc);
1395 }
1396
del_rx_sc(struct macsec_secy * secy,sci_t sci)1397 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1398 {
1399 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1400
1401 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1402 rx_sc;
1403 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1404 if (rx_sc->sci == sci) {
1405 if (rx_sc->active)
1406 secy->n_rx_sc--;
1407 rcu_assign_pointer(*rx_scp, rx_sc->next);
1408 return rx_sc;
1409 }
1410 }
1411
1412 return NULL;
1413 }
1414
create_rx_sc(struct net_device * dev,sci_t sci,bool active)1415 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci,
1416 bool active)
1417 {
1418 struct macsec_rx_sc *rx_sc;
1419 struct macsec_dev *macsec;
1420 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1421 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1422 struct macsec_secy *secy;
1423
1424 list_for_each_entry(macsec, &rxd->secys, secys) {
1425 if (find_rx_sc_rtnl(&macsec->secy, sci))
1426 return ERR_PTR(-EEXIST);
1427 }
1428
1429 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1430 if (!rx_sc)
1431 return ERR_PTR(-ENOMEM);
1432
1433 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1434 if (!rx_sc->stats) {
1435 kfree(rx_sc);
1436 return ERR_PTR(-ENOMEM);
1437 }
1438
1439 rx_sc->sci = sci;
1440 rx_sc->active = active;
1441 refcount_set(&rx_sc->refcnt, 1);
1442
1443 secy = &macsec_priv(dev)->secy;
1444 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1445 rcu_assign_pointer(secy->rx_sc, rx_sc);
1446
1447 if (rx_sc->active)
1448 secy->n_rx_sc++;
1449
1450 return rx_sc;
1451 }
1452
init_tx_sa(struct macsec_tx_sa * tx_sa,char * sak,int key_len,int icv_len)1453 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1454 int icv_len)
1455 {
1456 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1457 if (!tx_sa->stats)
1458 return -ENOMEM;
1459
1460 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1461 if (IS_ERR(tx_sa->key.tfm)) {
1462 free_percpu(tx_sa->stats);
1463 return PTR_ERR(tx_sa->key.tfm);
1464 }
1465
1466 tx_sa->ssci = MACSEC_UNDEF_SSCI;
1467 tx_sa->active = false;
1468 refcount_set(&tx_sa->refcnt, 1);
1469 spin_lock_init(&tx_sa->lock);
1470
1471 return 0;
1472 }
1473
clear_tx_sa(struct macsec_tx_sa * tx_sa)1474 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1475 {
1476 tx_sa->active = false;
1477
1478 macsec_txsa_put(tx_sa);
1479 }
1480
1481 static struct genl_family macsec_fam;
1482
get_dev_from_nl(struct net * net,struct nlattr ** attrs)1483 static struct net_device *get_dev_from_nl(struct net *net,
1484 struct nlattr **attrs)
1485 {
1486 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1487 struct net_device *dev;
1488
1489 dev = __dev_get_by_index(net, ifindex);
1490 if (!dev)
1491 return ERR_PTR(-ENODEV);
1492
1493 if (!netif_is_macsec(dev))
1494 return ERR_PTR(-ENODEV);
1495
1496 return dev;
1497 }
1498
nla_get_offload(const struct nlattr * nla)1499 static enum macsec_offload nla_get_offload(const struct nlattr *nla)
1500 {
1501 return (__force enum macsec_offload)nla_get_u8(nla);
1502 }
1503
nla_get_sci(const struct nlattr * nla)1504 static sci_t nla_get_sci(const struct nlattr *nla)
1505 {
1506 return (__force sci_t)nla_get_u64(nla);
1507 }
1508
nla_put_sci(struct sk_buff * skb,int attrtype,sci_t value,int padattr)1509 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1510 int padattr)
1511 {
1512 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1513 }
1514
nla_get_ssci(const struct nlattr * nla)1515 static ssci_t nla_get_ssci(const struct nlattr *nla)
1516 {
1517 return (__force ssci_t)nla_get_u32(nla);
1518 }
1519
nla_put_ssci(struct sk_buff * skb,int attrtype,ssci_t value)1520 static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
1521 {
1522 return nla_put_u32(skb, attrtype, (__force u64)value);
1523 }
1524
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)1525 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1526 struct nlattr **attrs,
1527 struct nlattr **tb_sa,
1528 struct net_device **devp,
1529 struct macsec_secy **secyp,
1530 struct macsec_tx_sc **scp,
1531 u8 *assoc_num)
1532 {
1533 struct net_device *dev;
1534 struct macsec_secy *secy;
1535 struct macsec_tx_sc *tx_sc;
1536 struct macsec_tx_sa *tx_sa;
1537
1538 if (!tb_sa[MACSEC_SA_ATTR_AN])
1539 return ERR_PTR(-EINVAL);
1540
1541 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1542
1543 dev = get_dev_from_nl(net, attrs);
1544 if (IS_ERR(dev))
1545 return ERR_CAST(dev);
1546
1547 if (*assoc_num >= MACSEC_NUM_AN)
1548 return ERR_PTR(-EINVAL);
1549
1550 secy = &macsec_priv(dev)->secy;
1551 tx_sc = &secy->tx_sc;
1552
1553 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1554 if (!tx_sa)
1555 return ERR_PTR(-ENODEV);
1556
1557 *devp = dev;
1558 *scp = tx_sc;
1559 *secyp = secy;
1560 return tx_sa;
1561 }
1562
get_rxsc_from_nl(struct net * net,struct nlattr ** attrs,struct nlattr ** tb_rxsc,struct net_device ** devp,struct macsec_secy ** secyp)1563 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1564 struct nlattr **attrs,
1565 struct nlattr **tb_rxsc,
1566 struct net_device **devp,
1567 struct macsec_secy **secyp)
1568 {
1569 struct net_device *dev;
1570 struct macsec_secy *secy;
1571 struct macsec_rx_sc *rx_sc;
1572 sci_t sci;
1573
1574 dev = get_dev_from_nl(net, attrs);
1575 if (IS_ERR(dev))
1576 return ERR_CAST(dev);
1577
1578 secy = &macsec_priv(dev)->secy;
1579
1580 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1581 return ERR_PTR(-EINVAL);
1582
1583 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1584 rx_sc = find_rx_sc_rtnl(secy, sci);
1585 if (!rx_sc)
1586 return ERR_PTR(-ENODEV);
1587
1588 *secyp = secy;
1589 *devp = dev;
1590
1591 return rx_sc;
1592 }
1593
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)1594 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1595 struct nlattr **attrs,
1596 struct nlattr **tb_rxsc,
1597 struct nlattr **tb_sa,
1598 struct net_device **devp,
1599 struct macsec_secy **secyp,
1600 struct macsec_rx_sc **scp,
1601 u8 *assoc_num)
1602 {
1603 struct macsec_rx_sc *rx_sc;
1604 struct macsec_rx_sa *rx_sa;
1605
1606 if (!tb_sa[MACSEC_SA_ATTR_AN])
1607 return ERR_PTR(-EINVAL);
1608
1609 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1610 if (*assoc_num >= MACSEC_NUM_AN)
1611 return ERR_PTR(-EINVAL);
1612
1613 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1614 if (IS_ERR(rx_sc))
1615 return ERR_CAST(rx_sc);
1616
1617 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1618 if (!rx_sa)
1619 return ERR_PTR(-ENODEV);
1620
1621 *scp = rx_sc;
1622 return rx_sa;
1623 }
1624
1625 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1626 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1627 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1628 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1629 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1630 };
1631
1632 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1633 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1634 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1635 };
1636
1637 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1638 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1639 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1640 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4),
1641 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1642 .len = MACSEC_KEYID_LEN, },
1643 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1644 .len = MACSEC_MAX_KEY_LEN, },
1645 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
1646 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
1647 .len = MACSEC_SALT_LEN, },
1648 };
1649
1650 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
1651 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
1652 };
1653
1654 /* Offloads an operation to a device driver */
macsec_offload(int (* const func)(struct macsec_context *),struct macsec_context * ctx)1655 static int macsec_offload(int (* const func)(struct macsec_context *),
1656 struct macsec_context *ctx)
1657 {
1658 int ret;
1659
1660 if (unlikely(!func))
1661 return 0;
1662
1663 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1664 mutex_lock(&ctx->phydev->lock);
1665
1666 ret = (*func)(ctx);
1667
1668 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1669 mutex_unlock(&ctx->phydev->lock);
1670
1671 return ret;
1672 }
1673
parse_sa_config(struct nlattr ** attrs,struct nlattr ** tb_sa)1674 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1675 {
1676 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1677 return -EINVAL;
1678
1679 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1680 return -EINVAL;
1681
1682 return 0;
1683 }
1684
parse_rxsc_config(struct nlattr ** attrs,struct nlattr ** tb_rxsc)1685 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1686 {
1687 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1688 return -EINVAL;
1689
1690 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1691 return -EINVAL;
1692
1693 return 0;
1694 }
1695
validate_add_rxsa(struct nlattr ** attrs)1696 static bool validate_add_rxsa(struct nlattr **attrs)
1697 {
1698 if (!attrs[MACSEC_SA_ATTR_AN] ||
1699 !attrs[MACSEC_SA_ATTR_KEY] ||
1700 !attrs[MACSEC_SA_ATTR_KEYID])
1701 return false;
1702
1703 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1704 return false;
1705
1706 if (attrs[MACSEC_SA_ATTR_PN] &&
1707 nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1708 return false;
1709
1710 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1711 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1712 return false;
1713 }
1714
1715 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1716 return false;
1717
1718 return true;
1719 }
1720
macsec_add_rxsa(struct sk_buff * skb,struct genl_info * info)1721 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1722 {
1723 struct net_device *dev;
1724 struct nlattr **attrs = info->attrs;
1725 struct macsec_secy *secy;
1726 struct macsec_rx_sc *rx_sc;
1727 struct macsec_rx_sa *rx_sa;
1728 unsigned char assoc_num;
1729 int pn_len;
1730 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1731 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1732 int err;
1733
1734 if (!attrs[MACSEC_ATTR_IFINDEX])
1735 return -EINVAL;
1736
1737 if (parse_sa_config(attrs, tb_sa))
1738 return -EINVAL;
1739
1740 if (parse_rxsc_config(attrs, tb_rxsc))
1741 return -EINVAL;
1742
1743 if (!validate_add_rxsa(tb_sa))
1744 return -EINVAL;
1745
1746 rtnl_lock();
1747 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1748 if (IS_ERR(rx_sc)) {
1749 rtnl_unlock();
1750 return PTR_ERR(rx_sc);
1751 }
1752
1753 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1754
1755 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1756 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1757 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1758 rtnl_unlock();
1759 return -EINVAL;
1760 }
1761
1762 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1763 if (tb_sa[MACSEC_SA_ATTR_PN] &&
1764 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1765 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
1766 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1767 rtnl_unlock();
1768 return -EINVAL;
1769 }
1770
1771 if (secy->xpn) {
1772 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
1773 rtnl_unlock();
1774 return -EINVAL;
1775 }
1776
1777 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
1778 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
1779 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
1780 MACSEC_SALT_LEN);
1781 rtnl_unlock();
1782 return -EINVAL;
1783 }
1784 }
1785
1786 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1787 if (rx_sa) {
1788 rtnl_unlock();
1789 return -EBUSY;
1790 }
1791
1792 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1793 if (!rx_sa) {
1794 rtnl_unlock();
1795 return -ENOMEM;
1796 }
1797
1798 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1799 secy->key_len, secy->icv_len);
1800 if (err < 0) {
1801 kfree(rx_sa);
1802 rtnl_unlock();
1803 return err;
1804 }
1805
1806 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1807 spin_lock_bh(&rx_sa->lock);
1808 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
1809 spin_unlock_bh(&rx_sa->lock);
1810 }
1811
1812 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1813 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1814
1815 rx_sa->sc = rx_sc;
1816
1817 if (secy->xpn) {
1818 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
1819 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
1820 MACSEC_SALT_LEN);
1821 }
1822
1823 /* If h/w offloading is available, propagate to the device */
1824 if (macsec_is_offloaded(netdev_priv(dev))) {
1825 const struct macsec_ops *ops;
1826 struct macsec_context ctx;
1827
1828 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1829 if (!ops) {
1830 err = -EOPNOTSUPP;
1831 goto cleanup;
1832 }
1833
1834 ctx.sa.assoc_num = assoc_num;
1835 ctx.sa.rx_sa = rx_sa;
1836 ctx.secy = secy;
1837 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1838 secy->key_len);
1839
1840 err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1841 memzero_explicit(ctx.sa.key, secy->key_len);
1842 if (err)
1843 goto cleanup;
1844 }
1845
1846 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1847 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1848
1849 rtnl_unlock();
1850
1851 return 0;
1852
1853 cleanup:
1854 macsec_rxsa_put(rx_sa);
1855 rtnl_unlock();
1856 return err;
1857 }
1858
validate_add_rxsc(struct nlattr ** attrs)1859 static bool validate_add_rxsc(struct nlattr **attrs)
1860 {
1861 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1862 return false;
1863
1864 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1865 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1866 return false;
1867 }
1868
1869 return true;
1870 }
1871
macsec_add_rxsc(struct sk_buff * skb,struct genl_info * info)1872 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1873 {
1874 struct net_device *dev;
1875 sci_t sci = MACSEC_UNDEF_SCI;
1876 struct nlattr **attrs = info->attrs;
1877 struct macsec_rx_sc *rx_sc;
1878 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1879 struct macsec_secy *secy;
1880 bool active = true;
1881 int ret;
1882
1883 if (!attrs[MACSEC_ATTR_IFINDEX])
1884 return -EINVAL;
1885
1886 if (parse_rxsc_config(attrs, tb_rxsc))
1887 return -EINVAL;
1888
1889 if (!validate_add_rxsc(tb_rxsc))
1890 return -EINVAL;
1891
1892 rtnl_lock();
1893 dev = get_dev_from_nl(genl_info_net(info), attrs);
1894 if (IS_ERR(dev)) {
1895 rtnl_unlock();
1896 return PTR_ERR(dev);
1897 }
1898
1899 secy = &macsec_priv(dev)->secy;
1900 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1901
1902 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1903 active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1904
1905 rx_sc = create_rx_sc(dev, sci, active);
1906 if (IS_ERR(rx_sc)) {
1907 rtnl_unlock();
1908 return PTR_ERR(rx_sc);
1909 }
1910
1911 if (macsec_is_offloaded(netdev_priv(dev))) {
1912 const struct macsec_ops *ops;
1913 struct macsec_context ctx;
1914
1915 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1916 if (!ops) {
1917 ret = -EOPNOTSUPP;
1918 goto cleanup;
1919 }
1920
1921 ctx.rx_sc = rx_sc;
1922 ctx.secy = secy;
1923
1924 ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1925 if (ret)
1926 goto cleanup;
1927 }
1928
1929 rtnl_unlock();
1930
1931 return 0;
1932
1933 cleanup:
1934 del_rx_sc(secy, sci);
1935 free_rx_sc(rx_sc);
1936 rtnl_unlock();
1937 return ret;
1938 }
1939
validate_add_txsa(struct nlattr ** attrs)1940 static bool validate_add_txsa(struct nlattr **attrs)
1941 {
1942 if (!attrs[MACSEC_SA_ATTR_AN] ||
1943 !attrs[MACSEC_SA_ATTR_PN] ||
1944 !attrs[MACSEC_SA_ATTR_KEY] ||
1945 !attrs[MACSEC_SA_ATTR_KEYID])
1946 return false;
1947
1948 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1949 return false;
1950
1951 if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1952 return false;
1953
1954 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1955 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1956 return false;
1957 }
1958
1959 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1960 return false;
1961
1962 return true;
1963 }
1964
macsec_add_txsa(struct sk_buff * skb,struct genl_info * info)1965 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1966 {
1967 struct net_device *dev;
1968 struct nlattr **attrs = info->attrs;
1969 struct macsec_secy *secy;
1970 struct macsec_tx_sc *tx_sc;
1971 struct macsec_tx_sa *tx_sa;
1972 unsigned char assoc_num;
1973 int pn_len;
1974 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1975 bool was_operational;
1976 int err;
1977
1978 if (!attrs[MACSEC_ATTR_IFINDEX])
1979 return -EINVAL;
1980
1981 if (parse_sa_config(attrs, tb_sa))
1982 return -EINVAL;
1983
1984 if (!validate_add_txsa(tb_sa))
1985 return -EINVAL;
1986
1987 rtnl_lock();
1988 dev = get_dev_from_nl(genl_info_net(info), attrs);
1989 if (IS_ERR(dev)) {
1990 rtnl_unlock();
1991 return PTR_ERR(dev);
1992 }
1993
1994 secy = &macsec_priv(dev)->secy;
1995 tx_sc = &secy->tx_sc;
1996
1997 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1998
1999 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
2000 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
2001 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
2002 rtnl_unlock();
2003 return -EINVAL;
2004 }
2005
2006 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2007 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2008 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
2009 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2010 rtnl_unlock();
2011 return -EINVAL;
2012 }
2013
2014 if (secy->xpn) {
2015 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
2016 rtnl_unlock();
2017 return -EINVAL;
2018 }
2019
2020 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
2021 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
2022 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
2023 MACSEC_SALT_LEN);
2024 rtnl_unlock();
2025 return -EINVAL;
2026 }
2027 }
2028
2029 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
2030 if (tx_sa) {
2031 rtnl_unlock();
2032 return -EBUSY;
2033 }
2034
2035 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
2036 if (!tx_sa) {
2037 rtnl_unlock();
2038 return -ENOMEM;
2039 }
2040
2041 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2042 secy->key_len, secy->icv_len);
2043 if (err < 0) {
2044 kfree(tx_sa);
2045 rtnl_unlock();
2046 return err;
2047 }
2048
2049 spin_lock_bh(&tx_sa->lock);
2050 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2051 spin_unlock_bh(&tx_sa->lock);
2052
2053 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2054 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2055
2056 was_operational = secy->operational;
2057 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
2058 secy->operational = true;
2059
2060 if (secy->xpn) {
2061 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
2062 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
2063 MACSEC_SALT_LEN);
2064 }
2065
2066 /* If h/w offloading is available, propagate to the device */
2067 if (macsec_is_offloaded(netdev_priv(dev))) {
2068 const struct macsec_ops *ops;
2069 struct macsec_context ctx;
2070
2071 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2072 if (!ops) {
2073 err = -EOPNOTSUPP;
2074 goto cleanup;
2075 }
2076
2077 ctx.sa.assoc_num = assoc_num;
2078 ctx.sa.tx_sa = tx_sa;
2079 ctx.secy = secy;
2080 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2081 secy->key_len);
2082
2083 err = macsec_offload(ops->mdo_add_txsa, &ctx);
2084 memzero_explicit(ctx.sa.key, secy->key_len);
2085 if (err)
2086 goto cleanup;
2087 }
2088
2089 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
2090 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
2091
2092 rtnl_unlock();
2093
2094 return 0;
2095
2096 cleanup:
2097 secy->operational = was_operational;
2098 macsec_txsa_put(tx_sa);
2099 rtnl_unlock();
2100 return err;
2101 }
2102
macsec_del_rxsa(struct sk_buff * skb,struct genl_info * info)2103 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
2104 {
2105 struct nlattr **attrs = info->attrs;
2106 struct net_device *dev;
2107 struct macsec_secy *secy;
2108 struct macsec_rx_sc *rx_sc;
2109 struct macsec_rx_sa *rx_sa;
2110 u8 assoc_num;
2111 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2112 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2113 int ret;
2114
2115 if (!attrs[MACSEC_ATTR_IFINDEX])
2116 return -EINVAL;
2117
2118 if (parse_sa_config(attrs, tb_sa))
2119 return -EINVAL;
2120
2121 if (parse_rxsc_config(attrs, tb_rxsc))
2122 return -EINVAL;
2123
2124 rtnl_lock();
2125 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2126 &dev, &secy, &rx_sc, &assoc_num);
2127 if (IS_ERR(rx_sa)) {
2128 rtnl_unlock();
2129 return PTR_ERR(rx_sa);
2130 }
2131
2132 if (rx_sa->active) {
2133 rtnl_unlock();
2134 return -EBUSY;
2135 }
2136
2137 /* If h/w offloading is available, propagate to the device */
2138 if (macsec_is_offloaded(netdev_priv(dev))) {
2139 const struct macsec_ops *ops;
2140 struct macsec_context ctx;
2141
2142 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2143 if (!ops) {
2144 ret = -EOPNOTSUPP;
2145 goto cleanup;
2146 }
2147
2148 ctx.sa.assoc_num = assoc_num;
2149 ctx.sa.rx_sa = rx_sa;
2150 ctx.secy = secy;
2151
2152 ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
2153 if (ret)
2154 goto cleanup;
2155 }
2156
2157 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
2158 clear_rx_sa(rx_sa);
2159
2160 rtnl_unlock();
2161
2162 return 0;
2163
2164 cleanup:
2165 rtnl_unlock();
2166 return ret;
2167 }
2168
macsec_del_rxsc(struct sk_buff * skb,struct genl_info * info)2169 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
2170 {
2171 struct nlattr **attrs = info->attrs;
2172 struct net_device *dev;
2173 struct macsec_secy *secy;
2174 struct macsec_rx_sc *rx_sc;
2175 sci_t sci;
2176 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2177 int ret;
2178
2179 if (!attrs[MACSEC_ATTR_IFINDEX])
2180 return -EINVAL;
2181
2182 if (parse_rxsc_config(attrs, tb_rxsc))
2183 return -EINVAL;
2184
2185 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
2186 return -EINVAL;
2187
2188 rtnl_lock();
2189 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2190 if (IS_ERR(dev)) {
2191 rtnl_unlock();
2192 return PTR_ERR(dev);
2193 }
2194
2195 secy = &macsec_priv(dev)->secy;
2196 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2197
2198 rx_sc = del_rx_sc(secy, sci);
2199 if (!rx_sc) {
2200 rtnl_unlock();
2201 return -ENODEV;
2202 }
2203
2204 /* If h/w offloading is available, propagate to the device */
2205 if (macsec_is_offloaded(netdev_priv(dev))) {
2206 const struct macsec_ops *ops;
2207 struct macsec_context ctx;
2208
2209 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2210 if (!ops) {
2211 ret = -EOPNOTSUPP;
2212 goto cleanup;
2213 }
2214
2215 ctx.rx_sc = rx_sc;
2216 ctx.secy = secy;
2217 ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2218 if (ret)
2219 goto cleanup;
2220 }
2221
2222 free_rx_sc(rx_sc);
2223 rtnl_unlock();
2224
2225 return 0;
2226
2227 cleanup:
2228 rtnl_unlock();
2229 return ret;
2230 }
2231
macsec_del_txsa(struct sk_buff * skb,struct genl_info * info)2232 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2233 {
2234 struct nlattr **attrs = info->attrs;
2235 struct net_device *dev;
2236 struct macsec_secy *secy;
2237 struct macsec_tx_sc *tx_sc;
2238 struct macsec_tx_sa *tx_sa;
2239 u8 assoc_num;
2240 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2241 int ret;
2242
2243 if (!attrs[MACSEC_ATTR_IFINDEX])
2244 return -EINVAL;
2245
2246 if (parse_sa_config(attrs, tb_sa))
2247 return -EINVAL;
2248
2249 rtnl_lock();
2250 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2251 &dev, &secy, &tx_sc, &assoc_num);
2252 if (IS_ERR(tx_sa)) {
2253 rtnl_unlock();
2254 return PTR_ERR(tx_sa);
2255 }
2256
2257 if (tx_sa->active) {
2258 rtnl_unlock();
2259 return -EBUSY;
2260 }
2261
2262 /* If h/w offloading is available, propagate to the device */
2263 if (macsec_is_offloaded(netdev_priv(dev))) {
2264 const struct macsec_ops *ops;
2265 struct macsec_context ctx;
2266
2267 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2268 if (!ops) {
2269 ret = -EOPNOTSUPP;
2270 goto cleanup;
2271 }
2272
2273 ctx.sa.assoc_num = assoc_num;
2274 ctx.sa.tx_sa = tx_sa;
2275 ctx.secy = secy;
2276
2277 ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2278 if (ret)
2279 goto cleanup;
2280 }
2281
2282 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2283 clear_tx_sa(tx_sa);
2284
2285 rtnl_unlock();
2286
2287 return 0;
2288
2289 cleanup:
2290 rtnl_unlock();
2291 return ret;
2292 }
2293
validate_upd_sa(struct nlattr ** attrs)2294 static bool validate_upd_sa(struct nlattr **attrs)
2295 {
2296 if (!attrs[MACSEC_SA_ATTR_AN] ||
2297 attrs[MACSEC_SA_ATTR_KEY] ||
2298 attrs[MACSEC_SA_ATTR_KEYID] ||
2299 attrs[MACSEC_SA_ATTR_SSCI] ||
2300 attrs[MACSEC_SA_ATTR_SALT])
2301 return false;
2302
2303 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2304 return false;
2305
2306 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
2307 return false;
2308
2309 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2310 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2311 return false;
2312 }
2313
2314 return true;
2315 }
2316
macsec_upd_txsa(struct sk_buff * skb,struct genl_info * info)2317 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2318 {
2319 struct nlattr **attrs = info->attrs;
2320 struct net_device *dev;
2321 struct macsec_secy *secy;
2322 struct macsec_tx_sc *tx_sc;
2323 struct macsec_tx_sa *tx_sa;
2324 u8 assoc_num;
2325 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2326 bool was_operational, was_active;
2327 pn_t prev_pn;
2328 int ret = 0;
2329
2330 prev_pn.full64 = 0;
2331
2332 if (!attrs[MACSEC_ATTR_IFINDEX])
2333 return -EINVAL;
2334
2335 if (parse_sa_config(attrs, tb_sa))
2336 return -EINVAL;
2337
2338 if (!validate_upd_sa(tb_sa))
2339 return -EINVAL;
2340
2341 rtnl_lock();
2342 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2343 &dev, &secy, &tx_sc, &assoc_num);
2344 if (IS_ERR(tx_sa)) {
2345 rtnl_unlock();
2346 return PTR_ERR(tx_sa);
2347 }
2348
2349 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2350 int pn_len;
2351
2352 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2353 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2354 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
2355 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2356 rtnl_unlock();
2357 return -EINVAL;
2358 }
2359
2360 spin_lock_bh(&tx_sa->lock);
2361 prev_pn = tx_sa->next_pn_halves;
2362 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2363 spin_unlock_bh(&tx_sa->lock);
2364 }
2365
2366 was_active = tx_sa->active;
2367 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2368 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2369
2370 was_operational = secy->operational;
2371 if (assoc_num == tx_sc->encoding_sa)
2372 secy->operational = tx_sa->active;
2373
2374 /* If h/w offloading is available, propagate to the device */
2375 if (macsec_is_offloaded(netdev_priv(dev))) {
2376 const struct macsec_ops *ops;
2377 struct macsec_context ctx;
2378
2379 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2380 if (!ops) {
2381 ret = -EOPNOTSUPP;
2382 goto cleanup;
2383 }
2384
2385 ctx.sa.assoc_num = assoc_num;
2386 ctx.sa.tx_sa = tx_sa;
2387 ctx.secy = secy;
2388
2389 ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
2390 if (ret)
2391 goto cleanup;
2392 }
2393
2394 rtnl_unlock();
2395
2396 return 0;
2397
2398 cleanup:
2399 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2400 spin_lock_bh(&tx_sa->lock);
2401 tx_sa->next_pn_halves = prev_pn;
2402 spin_unlock_bh(&tx_sa->lock);
2403 }
2404 tx_sa->active = was_active;
2405 secy->operational = was_operational;
2406 rtnl_unlock();
2407 return ret;
2408 }
2409
macsec_upd_rxsa(struct sk_buff * skb,struct genl_info * info)2410 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2411 {
2412 struct nlattr **attrs = info->attrs;
2413 struct net_device *dev;
2414 struct macsec_secy *secy;
2415 struct macsec_rx_sc *rx_sc;
2416 struct macsec_rx_sa *rx_sa;
2417 u8 assoc_num;
2418 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2419 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2420 bool was_active;
2421 pn_t prev_pn;
2422 int ret = 0;
2423
2424 prev_pn.full64 = 0;
2425
2426 if (!attrs[MACSEC_ATTR_IFINDEX])
2427 return -EINVAL;
2428
2429 if (parse_rxsc_config(attrs, tb_rxsc))
2430 return -EINVAL;
2431
2432 if (parse_sa_config(attrs, tb_sa))
2433 return -EINVAL;
2434
2435 if (!validate_upd_sa(tb_sa))
2436 return -EINVAL;
2437
2438 rtnl_lock();
2439 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2440 &dev, &secy, &rx_sc, &assoc_num);
2441 if (IS_ERR(rx_sa)) {
2442 rtnl_unlock();
2443 return PTR_ERR(rx_sa);
2444 }
2445
2446 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2447 int pn_len;
2448
2449 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2450 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2451 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
2452 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2453 rtnl_unlock();
2454 return -EINVAL;
2455 }
2456
2457 spin_lock_bh(&rx_sa->lock);
2458 prev_pn = rx_sa->next_pn_halves;
2459 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2460 spin_unlock_bh(&rx_sa->lock);
2461 }
2462
2463 was_active = rx_sa->active;
2464 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2465 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2466
2467 /* If h/w offloading is available, propagate to the device */
2468 if (macsec_is_offloaded(netdev_priv(dev))) {
2469 const struct macsec_ops *ops;
2470 struct macsec_context ctx;
2471
2472 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2473 if (!ops) {
2474 ret = -EOPNOTSUPP;
2475 goto cleanup;
2476 }
2477
2478 ctx.sa.assoc_num = assoc_num;
2479 ctx.sa.rx_sa = rx_sa;
2480 ctx.secy = secy;
2481
2482 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2483 if (ret)
2484 goto cleanup;
2485 }
2486
2487 rtnl_unlock();
2488 return 0;
2489
2490 cleanup:
2491 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2492 spin_lock_bh(&rx_sa->lock);
2493 rx_sa->next_pn_halves = prev_pn;
2494 spin_unlock_bh(&rx_sa->lock);
2495 }
2496 rx_sa->active = was_active;
2497 rtnl_unlock();
2498 return ret;
2499 }
2500
macsec_upd_rxsc(struct sk_buff * skb,struct genl_info * info)2501 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2502 {
2503 struct nlattr **attrs = info->attrs;
2504 struct net_device *dev;
2505 struct macsec_secy *secy;
2506 struct macsec_rx_sc *rx_sc;
2507 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2508 unsigned int prev_n_rx_sc;
2509 bool was_active;
2510 int ret;
2511
2512 if (!attrs[MACSEC_ATTR_IFINDEX])
2513 return -EINVAL;
2514
2515 if (parse_rxsc_config(attrs, tb_rxsc))
2516 return -EINVAL;
2517
2518 if (!validate_add_rxsc(tb_rxsc))
2519 return -EINVAL;
2520
2521 rtnl_lock();
2522 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2523 if (IS_ERR(rx_sc)) {
2524 rtnl_unlock();
2525 return PTR_ERR(rx_sc);
2526 }
2527
2528 was_active = rx_sc->active;
2529 prev_n_rx_sc = secy->n_rx_sc;
2530 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2531 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2532
2533 if (rx_sc->active != new)
2534 secy->n_rx_sc += new ? 1 : -1;
2535
2536 rx_sc->active = new;
2537 }
2538
2539 /* If h/w offloading is available, propagate to the device */
2540 if (macsec_is_offloaded(netdev_priv(dev))) {
2541 const struct macsec_ops *ops;
2542 struct macsec_context ctx;
2543
2544 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2545 if (!ops) {
2546 ret = -EOPNOTSUPP;
2547 goto cleanup;
2548 }
2549
2550 ctx.rx_sc = rx_sc;
2551 ctx.secy = secy;
2552
2553 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2554 if (ret)
2555 goto cleanup;
2556 }
2557
2558 rtnl_unlock();
2559
2560 return 0;
2561
2562 cleanup:
2563 secy->n_rx_sc = prev_n_rx_sc;
2564 rx_sc->active = was_active;
2565 rtnl_unlock();
2566 return ret;
2567 }
2568
macsec_is_configured(struct macsec_dev * macsec)2569 static bool macsec_is_configured(struct macsec_dev *macsec)
2570 {
2571 struct macsec_secy *secy = &macsec->secy;
2572 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2573 int i;
2574
2575 if (secy->rx_sc)
2576 return true;
2577
2578 for (i = 0; i < MACSEC_NUM_AN; i++)
2579 if (tx_sc->sa[i])
2580 return true;
2581
2582 return false;
2583 }
2584
macsec_upd_offload(struct sk_buff * skb,struct genl_info * info)2585 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2586 {
2587 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2588 enum macsec_offload offload, prev_offload;
2589 int (*func)(struct macsec_context *ctx);
2590 struct nlattr **attrs = info->attrs;
2591 struct net_device *dev;
2592 const struct macsec_ops *ops;
2593 struct macsec_context ctx;
2594 struct macsec_dev *macsec;
2595 int ret = 0;
2596
2597 if (!attrs[MACSEC_ATTR_IFINDEX])
2598 return -EINVAL;
2599
2600 if (!attrs[MACSEC_ATTR_OFFLOAD])
2601 return -EINVAL;
2602
2603 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2604 attrs[MACSEC_ATTR_OFFLOAD],
2605 macsec_genl_offload_policy, NULL))
2606 return -EINVAL;
2607
2608 rtnl_lock();
2609
2610 dev = get_dev_from_nl(genl_info_net(info), attrs);
2611 if (IS_ERR(dev)) {
2612 ret = PTR_ERR(dev);
2613 goto out;
2614 }
2615 macsec = macsec_priv(dev);
2616
2617 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) {
2618 ret = -EINVAL;
2619 goto out;
2620 }
2621
2622 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2623 if (macsec->offload == offload)
2624 goto out;
2625
2626 /* Check if the offloading mode is supported by the underlying layers */
2627 if (offload != MACSEC_OFFLOAD_OFF &&
2628 !macsec_check_offload(offload, macsec)) {
2629 ret = -EOPNOTSUPP;
2630 goto out;
2631 }
2632
2633 /* Check if the net device is busy. */
2634 if (netif_running(dev)) {
2635 ret = -EBUSY;
2636 goto out;
2637 }
2638
2639 prev_offload = macsec->offload;
2640 macsec->offload = offload;
2641
2642 /* Check if the device already has rules configured: we do not support
2643 * rules migration.
2644 */
2645 if (macsec_is_configured(macsec)) {
2646 ret = -EBUSY;
2647 goto rollback;
2648 }
2649
2650 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2651 macsec, &ctx);
2652 if (!ops) {
2653 ret = -EOPNOTSUPP;
2654 goto rollback;
2655 }
2656
2657 if (prev_offload == MACSEC_OFFLOAD_OFF)
2658 func = ops->mdo_add_secy;
2659 else
2660 func = ops->mdo_del_secy;
2661
2662 ctx.secy = &macsec->secy;
2663 ret = macsec_offload(func, &ctx);
2664 if (ret)
2665 goto rollback;
2666
2667 rtnl_unlock();
2668 return 0;
2669
2670 rollback:
2671 macsec->offload = prev_offload;
2672 out:
2673 rtnl_unlock();
2674 return ret;
2675 }
2676
get_tx_sa_stats(struct net_device * dev,int an,struct macsec_tx_sa * tx_sa,struct macsec_tx_sa_stats * sum)2677 static void get_tx_sa_stats(struct net_device *dev, int an,
2678 struct macsec_tx_sa *tx_sa,
2679 struct macsec_tx_sa_stats *sum)
2680 {
2681 struct macsec_dev *macsec = macsec_priv(dev);
2682 int cpu;
2683
2684 /* If h/w offloading is available, propagate to the device */
2685 if (macsec_is_offloaded(macsec)) {
2686 const struct macsec_ops *ops;
2687 struct macsec_context ctx;
2688
2689 ops = macsec_get_ops(macsec, &ctx);
2690 if (ops) {
2691 ctx.sa.assoc_num = an;
2692 ctx.sa.tx_sa = tx_sa;
2693 ctx.stats.tx_sa_stats = sum;
2694 ctx.secy = &macsec_priv(dev)->secy;
2695 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
2696 }
2697 return;
2698 }
2699
2700 for_each_possible_cpu(cpu) {
2701 const struct macsec_tx_sa_stats *stats =
2702 per_cpu_ptr(tx_sa->stats, cpu);
2703
2704 sum->OutPktsProtected += stats->OutPktsProtected;
2705 sum->OutPktsEncrypted += stats->OutPktsEncrypted;
2706 }
2707 }
2708
copy_tx_sa_stats(struct sk_buff * skb,struct macsec_tx_sa_stats * sum)2709 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
2710 {
2711 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
2712 sum->OutPktsProtected) ||
2713 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2714 sum->OutPktsEncrypted))
2715 return -EMSGSIZE;
2716
2717 return 0;
2718 }
2719
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)2720 static void get_rx_sa_stats(struct net_device *dev,
2721 struct macsec_rx_sc *rx_sc, int an,
2722 struct macsec_rx_sa *rx_sa,
2723 struct macsec_rx_sa_stats *sum)
2724 {
2725 struct macsec_dev *macsec = macsec_priv(dev);
2726 int cpu;
2727
2728 /* If h/w offloading is available, propagate to the device */
2729 if (macsec_is_offloaded(macsec)) {
2730 const struct macsec_ops *ops;
2731 struct macsec_context ctx;
2732
2733 ops = macsec_get_ops(macsec, &ctx);
2734 if (ops) {
2735 ctx.sa.assoc_num = an;
2736 ctx.sa.rx_sa = rx_sa;
2737 ctx.stats.rx_sa_stats = sum;
2738 ctx.secy = &macsec_priv(dev)->secy;
2739 ctx.rx_sc = rx_sc;
2740 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
2741 }
2742 return;
2743 }
2744
2745 for_each_possible_cpu(cpu) {
2746 const struct macsec_rx_sa_stats *stats =
2747 per_cpu_ptr(rx_sa->stats, cpu);
2748
2749 sum->InPktsOK += stats->InPktsOK;
2750 sum->InPktsInvalid += stats->InPktsInvalid;
2751 sum->InPktsNotValid += stats->InPktsNotValid;
2752 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
2753 sum->InPktsUnusedSA += stats->InPktsUnusedSA;
2754 }
2755 }
2756
copy_rx_sa_stats(struct sk_buff * skb,struct macsec_rx_sa_stats * sum)2757 static int copy_rx_sa_stats(struct sk_buff *skb,
2758 struct macsec_rx_sa_stats *sum)
2759 {
2760 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
2761 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
2762 sum->InPktsInvalid) ||
2763 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
2764 sum->InPktsNotValid) ||
2765 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2766 sum->InPktsNotUsingSA) ||
2767 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
2768 sum->InPktsUnusedSA))
2769 return -EMSGSIZE;
2770
2771 return 0;
2772 }
2773
get_rx_sc_stats(struct net_device * dev,struct macsec_rx_sc * rx_sc,struct macsec_rx_sc_stats * sum)2774 static void get_rx_sc_stats(struct net_device *dev,
2775 struct macsec_rx_sc *rx_sc,
2776 struct macsec_rx_sc_stats *sum)
2777 {
2778 struct macsec_dev *macsec = macsec_priv(dev);
2779 int cpu;
2780
2781 /* If h/w offloading is available, propagate to the device */
2782 if (macsec_is_offloaded(macsec)) {
2783 const struct macsec_ops *ops;
2784 struct macsec_context ctx;
2785
2786 ops = macsec_get_ops(macsec, &ctx);
2787 if (ops) {
2788 ctx.stats.rx_sc_stats = sum;
2789 ctx.secy = &macsec_priv(dev)->secy;
2790 ctx.rx_sc = rx_sc;
2791 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
2792 }
2793 return;
2794 }
2795
2796 for_each_possible_cpu(cpu) {
2797 const struct pcpu_rx_sc_stats *stats;
2798 struct macsec_rx_sc_stats tmp;
2799 unsigned int start;
2800
2801 stats = per_cpu_ptr(rx_sc->stats, cpu);
2802 do {
2803 start = u64_stats_fetch_begin_irq(&stats->syncp);
2804 memcpy(&tmp, &stats->stats, sizeof(tmp));
2805 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2806
2807 sum->InOctetsValidated += tmp.InOctetsValidated;
2808 sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
2809 sum->InPktsUnchecked += tmp.InPktsUnchecked;
2810 sum->InPktsDelayed += tmp.InPktsDelayed;
2811 sum->InPktsOK += tmp.InPktsOK;
2812 sum->InPktsInvalid += tmp.InPktsInvalid;
2813 sum->InPktsLate += tmp.InPktsLate;
2814 sum->InPktsNotValid += tmp.InPktsNotValid;
2815 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2816 sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
2817 }
2818 }
2819
copy_rx_sc_stats(struct sk_buff * skb,struct macsec_rx_sc_stats * sum)2820 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
2821 {
2822 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2823 sum->InOctetsValidated,
2824 MACSEC_RXSC_STATS_ATTR_PAD) ||
2825 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2826 sum->InOctetsDecrypted,
2827 MACSEC_RXSC_STATS_ATTR_PAD) ||
2828 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2829 sum->InPktsUnchecked,
2830 MACSEC_RXSC_STATS_ATTR_PAD) ||
2831 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2832 sum->InPktsDelayed,
2833 MACSEC_RXSC_STATS_ATTR_PAD) ||
2834 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2835 sum->InPktsOK,
2836 MACSEC_RXSC_STATS_ATTR_PAD) ||
2837 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2838 sum->InPktsInvalid,
2839 MACSEC_RXSC_STATS_ATTR_PAD) ||
2840 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2841 sum->InPktsLate,
2842 MACSEC_RXSC_STATS_ATTR_PAD) ||
2843 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2844 sum->InPktsNotValid,
2845 MACSEC_RXSC_STATS_ATTR_PAD) ||
2846 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2847 sum->InPktsNotUsingSA,
2848 MACSEC_RXSC_STATS_ATTR_PAD) ||
2849 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2850 sum->InPktsUnusedSA,
2851 MACSEC_RXSC_STATS_ATTR_PAD))
2852 return -EMSGSIZE;
2853
2854 return 0;
2855 }
2856
get_tx_sc_stats(struct net_device * dev,struct macsec_tx_sc_stats * sum)2857 static void get_tx_sc_stats(struct net_device *dev,
2858 struct macsec_tx_sc_stats *sum)
2859 {
2860 struct macsec_dev *macsec = macsec_priv(dev);
2861 int cpu;
2862
2863 /* If h/w offloading is available, propagate to the device */
2864 if (macsec_is_offloaded(macsec)) {
2865 const struct macsec_ops *ops;
2866 struct macsec_context ctx;
2867
2868 ops = macsec_get_ops(macsec, &ctx);
2869 if (ops) {
2870 ctx.stats.tx_sc_stats = sum;
2871 ctx.secy = &macsec_priv(dev)->secy;
2872 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
2873 }
2874 return;
2875 }
2876
2877 for_each_possible_cpu(cpu) {
2878 const struct pcpu_tx_sc_stats *stats;
2879 struct macsec_tx_sc_stats tmp;
2880 unsigned int start;
2881
2882 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
2883 do {
2884 start = u64_stats_fetch_begin_irq(&stats->syncp);
2885 memcpy(&tmp, &stats->stats, sizeof(tmp));
2886 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2887
2888 sum->OutPktsProtected += tmp.OutPktsProtected;
2889 sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
2890 sum->OutOctetsProtected += tmp.OutOctetsProtected;
2891 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2892 }
2893 }
2894
copy_tx_sc_stats(struct sk_buff * skb,struct macsec_tx_sc_stats * sum)2895 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
2896 {
2897 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2898 sum->OutPktsProtected,
2899 MACSEC_TXSC_STATS_ATTR_PAD) ||
2900 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2901 sum->OutPktsEncrypted,
2902 MACSEC_TXSC_STATS_ATTR_PAD) ||
2903 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2904 sum->OutOctetsProtected,
2905 MACSEC_TXSC_STATS_ATTR_PAD) ||
2906 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2907 sum->OutOctetsEncrypted,
2908 MACSEC_TXSC_STATS_ATTR_PAD))
2909 return -EMSGSIZE;
2910
2911 return 0;
2912 }
2913
get_secy_stats(struct net_device * dev,struct macsec_dev_stats * sum)2914 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
2915 {
2916 struct macsec_dev *macsec = macsec_priv(dev);
2917 int cpu;
2918
2919 /* If h/w offloading is available, propagate to the device */
2920 if (macsec_is_offloaded(macsec)) {
2921 const struct macsec_ops *ops;
2922 struct macsec_context ctx;
2923
2924 ops = macsec_get_ops(macsec, &ctx);
2925 if (ops) {
2926 ctx.stats.dev_stats = sum;
2927 ctx.secy = &macsec_priv(dev)->secy;
2928 macsec_offload(ops->mdo_get_dev_stats, &ctx);
2929 }
2930 return;
2931 }
2932
2933 for_each_possible_cpu(cpu) {
2934 const struct pcpu_secy_stats *stats;
2935 struct macsec_dev_stats tmp;
2936 unsigned int start;
2937
2938 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
2939 do {
2940 start = u64_stats_fetch_begin_irq(&stats->syncp);
2941 memcpy(&tmp, &stats->stats, sizeof(tmp));
2942 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2943
2944 sum->OutPktsUntagged += tmp.OutPktsUntagged;
2945 sum->InPktsUntagged += tmp.InPktsUntagged;
2946 sum->OutPktsTooLong += tmp.OutPktsTooLong;
2947 sum->InPktsNoTag += tmp.InPktsNoTag;
2948 sum->InPktsBadTag += tmp.InPktsBadTag;
2949 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2950 sum->InPktsNoSCI += tmp.InPktsNoSCI;
2951 sum->InPktsOverrun += tmp.InPktsOverrun;
2952 }
2953 }
2954
copy_secy_stats(struct sk_buff * skb,struct macsec_dev_stats * sum)2955 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
2956 {
2957 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2958 sum->OutPktsUntagged,
2959 MACSEC_SECY_STATS_ATTR_PAD) ||
2960 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2961 sum->InPktsUntagged,
2962 MACSEC_SECY_STATS_ATTR_PAD) ||
2963 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2964 sum->OutPktsTooLong,
2965 MACSEC_SECY_STATS_ATTR_PAD) ||
2966 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2967 sum->InPktsNoTag,
2968 MACSEC_SECY_STATS_ATTR_PAD) ||
2969 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2970 sum->InPktsBadTag,
2971 MACSEC_SECY_STATS_ATTR_PAD) ||
2972 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2973 sum->InPktsUnknownSCI,
2974 MACSEC_SECY_STATS_ATTR_PAD) ||
2975 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2976 sum->InPktsNoSCI,
2977 MACSEC_SECY_STATS_ATTR_PAD) ||
2978 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2979 sum->InPktsOverrun,
2980 MACSEC_SECY_STATS_ATTR_PAD))
2981 return -EMSGSIZE;
2982
2983 return 0;
2984 }
2985
nla_put_secy(struct macsec_secy * secy,struct sk_buff * skb)2986 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2987 {
2988 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2989 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
2990 MACSEC_ATTR_SECY);
2991 u64 csid;
2992
2993 if (!secy_nest)
2994 return 1;
2995
2996 switch (secy->key_len) {
2997 case MACSEC_GCM_AES_128_SAK_LEN:
2998 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
2999 break;
3000 case MACSEC_GCM_AES_256_SAK_LEN:
3001 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
3002 break;
3003 default:
3004 goto cancel;
3005 }
3006
3007 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
3008 MACSEC_SECY_ATTR_PAD) ||
3009 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
3010 csid, MACSEC_SECY_ATTR_PAD) ||
3011 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
3012 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
3013 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
3014 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
3015 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
3016 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
3017 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
3018 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
3019 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
3020 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
3021 goto cancel;
3022
3023 if (secy->replay_protect) {
3024 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
3025 goto cancel;
3026 }
3027
3028 nla_nest_end(skb, secy_nest);
3029 return 0;
3030
3031 cancel:
3032 nla_nest_cancel(skb, secy_nest);
3033 return 1;
3034 }
3035
3036 static noinline_for_stack int
dump_secy(struct macsec_secy * secy,struct net_device * dev,struct sk_buff * skb,struct netlink_callback * cb)3037 dump_secy(struct macsec_secy *secy, struct net_device *dev,
3038 struct sk_buff *skb, struct netlink_callback *cb)
3039 {
3040 struct macsec_tx_sc_stats tx_sc_stats = {0, };
3041 struct macsec_tx_sa_stats tx_sa_stats = {0, };
3042 struct macsec_rx_sc_stats rx_sc_stats = {0, };
3043 struct macsec_rx_sa_stats rx_sa_stats = {0, };
3044 struct macsec_dev *macsec = netdev_priv(dev);
3045 struct macsec_dev_stats dev_stats = {0, };
3046 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3047 struct nlattr *txsa_list, *rxsc_list;
3048 struct macsec_rx_sc *rx_sc;
3049 struct nlattr *attr;
3050 void *hdr;
3051 int i, j;
3052
3053 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3054 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
3055 if (!hdr)
3056 return -EMSGSIZE;
3057
3058 genl_dump_check_consistent(cb, hdr);
3059
3060 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
3061 goto nla_put_failure;
3062
3063 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
3064 if (!attr)
3065 goto nla_put_failure;
3066 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
3067 goto nla_put_failure;
3068 nla_nest_end(skb, attr);
3069
3070 if (nla_put_secy(secy, skb))
3071 goto nla_put_failure;
3072
3073 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
3074 if (!attr)
3075 goto nla_put_failure;
3076
3077 get_tx_sc_stats(dev, &tx_sc_stats);
3078 if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
3079 nla_nest_cancel(skb, attr);
3080 goto nla_put_failure;
3081 }
3082 nla_nest_end(skb, attr);
3083
3084 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
3085 if (!attr)
3086 goto nla_put_failure;
3087 get_secy_stats(dev, &dev_stats);
3088 if (copy_secy_stats(skb, &dev_stats)) {
3089 nla_nest_cancel(skb, attr);
3090 goto nla_put_failure;
3091 }
3092 nla_nest_end(skb, attr);
3093
3094 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
3095 if (!txsa_list)
3096 goto nla_put_failure;
3097 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
3098 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
3099 struct nlattr *txsa_nest;
3100 u64 pn;
3101 int pn_len;
3102
3103 if (!tx_sa)
3104 continue;
3105
3106 txsa_nest = nla_nest_start_noflag(skb, j++);
3107 if (!txsa_nest) {
3108 nla_nest_cancel(skb, txsa_list);
3109 goto nla_put_failure;
3110 }
3111
3112 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
3113 if (!attr) {
3114 nla_nest_cancel(skb, txsa_nest);
3115 nla_nest_cancel(skb, txsa_list);
3116 goto nla_put_failure;
3117 }
3118 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
3119 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
3120 if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
3121 nla_nest_cancel(skb, attr);
3122 nla_nest_cancel(skb, txsa_nest);
3123 nla_nest_cancel(skb, txsa_list);
3124 goto nla_put_failure;
3125 }
3126 nla_nest_end(skb, attr);
3127
3128 if (secy->xpn) {
3129 pn = tx_sa->next_pn;
3130 pn_len = MACSEC_XPN_PN_LEN;
3131 } else {
3132 pn = tx_sa->next_pn_halves.lower;
3133 pn_len = MACSEC_DEFAULT_PN_LEN;
3134 }
3135
3136 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3137 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3138 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
3139 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
3140 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
3141 nla_nest_cancel(skb, txsa_nest);
3142 nla_nest_cancel(skb, txsa_list);
3143 goto nla_put_failure;
3144 }
3145
3146 nla_nest_end(skb, txsa_nest);
3147 }
3148 nla_nest_end(skb, txsa_list);
3149
3150 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
3151 if (!rxsc_list)
3152 goto nla_put_failure;
3153
3154 j = 1;
3155 for_each_rxsc_rtnl(secy, rx_sc) {
3156 int k;
3157 struct nlattr *rxsa_list;
3158 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
3159
3160 if (!rxsc_nest) {
3161 nla_nest_cancel(skb, rxsc_list);
3162 goto nla_put_failure;
3163 }
3164
3165 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
3166 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
3167 MACSEC_RXSC_ATTR_PAD)) {
3168 nla_nest_cancel(skb, rxsc_nest);
3169 nla_nest_cancel(skb, rxsc_list);
3170 goto nla_put_failure;
3171 }
3172
3173 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
3174 if (!attr) {
3175 nla_nest_cancel(skb, rxsc_nest);
3176 nla_nest_cancel(skb, rxsc_list);
3177 goto nla_put_failure;
3178 }
3179 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
3180 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
3181 if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
3182 nla_nest_cancel(skb, attr);
3183 nla_nest_cancel(skb, rxsc_nest);
3184 nla_nest_cancel(skb, rxsc_list);
3185 goto nla_put_failure;
3186 }
3187 nla_nest_end(skb, attr);
3188
3189 rxsa_list = nla_nest_start_noflag(skb,
3190 MACSEC_RXSC_ATTR_SA_LIST);
3191 if (!rxsa_list) {
3192 nla_nest_cancel(skb, rxsc_nest);
3193 nla_nest_cancel(skb, rxsc_list);
3194 goto nla_put_failure;
3195 }
3196
3197 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
3198 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
3199 struct nlattr *rxsa_nest;
3200 u64 pn;
3201 int pn_len;
3202
3203 if (!rx_sa)
3204 continue;
3205
3206 rxsa_nest = nla_nest_start_noflag(skb, k++);
3207 if (!rxsa_nest) {
3208 nla_nest_cancel(skb, rxsa_list);
3209 nla_nest_cancel(skb, rxsc_nest);
3210 nla_nest_cancel(skb, rxsc_list);
3211 goto nla_put_failure;
3212 }
3213
3214 attr = nla_nest_start_noflag(skb,
3215 MACSEC_SA_ATTR_STATS);
3216 if (!attr) {
3217 nla_nest_cancel(skb, rxsa_list);
3218 nla_nest_cancel(skb, rxsc_nest);
3219 nla_nest_cancel(skb, rxsc_list);
3220 goto nla_put_failure;
3221 }
3222 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
3223 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
3224 if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
3225 nla_nest_cancel(skb, attr);
3226 nla_nest_cancel(skb, rxsa_list);
3227 nla_nest_cancel(skb, rxsc_nest);
3228 nla_nest_cancel(skb, rxsc_list);
3229 goto nla_put_failure;
3230 }
3231 nla_nest_end(skb, attr);
3232
3233 if (secy->xpn) {
3234 pn = rx_sa->next_pn;
3235 pn_len = MACSEC_XPN_PN_LEN;
3236 } else {
3237 pn = rx_sa->next_pn_halves.lower;
3238 pn_len = MACSEC_DEFAULT_PN_LEN;
3239 }
3240
3241 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3242 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3243 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
3244 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
3245 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
3246 nla_nest_cancel(skb, rxsa_nest);
3247 nla_nest_cancel(skb, rxsc_nest);
3248 nla_nest_cancel(skb, rxsc_list);
3249 goto nla_put_failure;
3250 }
3251 nla_nest_end(skb, rxsa_nest);
3252 }
3253
3254 nla_nest_end(skb, rxsa_list);
3255 nla_nest_end(skb, rxsc_nest);
3256 }
3257
3258 nla_nest_end(skb, rxsc_list);
3259
3260 genlmsg_end(skb, hdr);
3261
3262 return 0;
3263
3264 nla_put_failure:
3265 genlmsg_cancel(skb, hdr);
3266 return -EMSGSIZE;
3267 }
3268
3269 static int macsec_generation = 1; /* protected by RTNL */
3270
macsec_dump_txsc(struct sk_buff * skb,struct netlink_callback * cb)3271 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
3272 {
3273 struct net *net = sock_net(skb->sk);
3274 struct net_device *dev;
3275 int dev_idx, d;
3276
3277 dev_idx = cb->args[0];
3278
3279 d = 0;
3280 rtnl_lock();
3281
3282 cb->seq = macsec_generation;
3283
3284 for_each_netdev(net, dev) {
3285 struct macsec_secy *secy;
3286
3287 if (d < dev_idx)
3288 goto next;
3289
3290 if (!netif_is_macsec(dev))
3291 goto next;
3292
3293 secy = &macsec_priv(dev)->secy;
3294 if (dump_secy(secy, dev, skb, cb) < 0)
3295 goto done;
3296 next:
3297 d++;
3298 }
3299
3300 done:
3301 rtnl_unlock();
3302 cb->args[0] = d;
3303 return skb->len;
3304 }
3305
3306 static const struct genl_small_ops macsec_genl_ops[] = {
3307 {
3308 .cmd = MACSEC_CMD_GET_TXSC,
3309 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3310 .dumpit = macsec_dump_txsc,
3311 },
3312 {
3313 .cmd = MACSEC_CMD_ADD_RXSC,
3314 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3315 .doit = macsec_add_rxsc,
3316 .flags = GENL_ADMIN_PERM,
3317 },
3318 {
3319 .cmd = MACSEC_CMD_DEL_RXSC,
3320 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3321 .doit = macsec_del_rxsc,
3322 .flags = GENL_ADMIN_PERM,
3323 },
3324 {
3325 .cmd = MACSEC_CMD_UPD_RXSC,
3326 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3327 .doit = macsec_upd_rxsc,
3328 .flags = GENL_ADMIN_PERM,
3329 },
3330 {
3331 .cmd = MACSEC_CMD_ADD_TXSA,
3332 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3333 .doit = macsec_add_txsa,
3334 .flags = GENL_ADMIN_PERM,
3335 },
3336 {
3337 .cmd = MACSEC_CMD_DEL_TXSA,
3338 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3339 .doit = macsec_del_txsa,
3340 .flags = GENL_ADMIN_PERM,
3341 },
3342 {
3343 .cmd = MACSEC_CMD_UPD_TXSA,
3344 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3345 .doit = macsec_upd_txsa,
3346 .flags = GENL_ADMIN_PERM,
3347 },
3348 {
3349 .cmd = MACSEC_CMD_ADD_RXSA,
3350 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3351 .doit = macsec_add_rxsa,
3352 .flags = GENL_ADMIN_PERM,
3353 },
3354 {
3355 .cmd = MACSEC_CMD_DEL_RXSA,
3356 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3357 .doit = macsec_del_rxsa,
3358 .flags = GENL_ADMIN_PERM,
3359 },
3360 {
3361 .cmd = MACSEC_CMD_UPD_RXSA,
3362 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3363 .doit = macsec_upd_rxsa,
3364 .flags = GENL_ADMIN_PERM,
3365 },
3366 {
3367 .cmd = MACSEC_CMD_UPD_OFFLOAD,
3368 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3369 .doit = macsec_upd_offload,
3370 .flags = GENL_ADMIN_PERM,
3371 },
3372 };
3373
3374 static struct genl_family macsec_fam __ro_after_init = {
3375 .name = MACSEC_GENL_NAME,
3376 .hdrsize = 0,
3377 .version = MACSEC_GENL_VERSION,
3378 .maxattr = MACSEC_ATTR_MAX,
3379 .policy = macsec_genl_policy,
3380 .netnsok = true,
3381 .module = THIS_MODULE,
3382 .small_ops = macsec_genl_ops,
3383 .n_small_ops = ARRAY_SIZE(macsec_genl_ops),
3384 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1,
3385 };
3386
macsec_start_xmit(struct sk_buff * skb,struct net_device * dev)3387 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3388 struct net_device *dev)
3389 {
3390 struct macsec_dev *macsec = netdev_priv(dev);
3391 struct macsec_secy *secy = &macsec->secy;
3392 struct pcpu_secy_stats *secy_stats;
3393 int ret, len;
3394
3395 if (macsec_is_offloaded(netdev_priv(dev))) {
3396 struct metadata_dst *md_dst = secy->tx_sc.md_dst;
3397
3398 skb_dst_drop(skb);
3399 dst_hold(&md_dst->dst);
3400 skb_dst_set(skb, &md_dst->dst);
3401 skb->dev = macsec->real_dev;
3402 return dev_queue_xmit(skb);
3403 }
3404
3405 /* 10.5 */
3406 if (!secy->protect_frames) {
3407 secy_stats = this_cpu_ptr(macsec->stats);
3408 u64_stats_update_begin(&secy_stats->syncp);
3409 secy_stats->stats.OutPktsUntagged++;
3410 u64_stats_update_end(&secy_stats->syncp);
3411 skb->dev = macsec->real_dev;
3412 len = skb->len;
3413 ret = dev_queue_xmit(skb);
3414 count_tx(dev, ret, len);
3415 return ret;
3416 }
3417
3418 if (!secy->operational) {
3419 kfree_skb(skb);
3420 DEV_STATS_INC(dev, tx_dropped);
3421 return NETDEV_TX_OK;
3422 }
3423
3424 len = skb->len;
3425 skb = macsec_encrypt(skb, dev);
3426 if (IS_ERR(skb)) {
3427 if (PTR_ERR(skb) != -EINPROGRESS)
3428 DEV_STATS_INC(dev, tx_dropped);
3429 return NETDEV_TX_OK;
3430 }
3431
3432 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3433
3434 macsec_encrypt_finish(skb, dev);
3435 ret = dev_queue_xmit(skb);
3436 count_tx(dev, ret, len);
3437 return ret;
3438 }
3439
3440 #define MACSEC_FEATURES \
3441 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3442
macsec_dev_init(struct net_device * dev)3443 static int macsec_dev_init(struct net_device *dev)
3444 {
3445 struct macsec_dev *macsec = macsec_priv(dev);
3446 struct net_device *real_dev = macsec->real_dev;
3447 int err;
3448
3449 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3450 if (!dev->tstats)
3451 return -ENOMEM;
3452
3453 err = gro_cells_init(&macsec->gro_cells, dev);
3454 if (err) {
3455 free_percpu(dev->tstats);
3456 return err;
3457 }
3458
3459 dev->features = real_dev->features & MACSEC_FEATURES;
3460 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
3461
3462 dev->needed_headroom = real_dev->needed_headroom +
3463 MACSEC_NEEDED_HEADROOM;
3464 dev->needed_tailroom = real_dev->needed_tailroom +
3465 MACSEC_NEEDED_TAILROOM;
3466
3467 if (is_zero_ether_addr(dev->dev_addr))
3468 eth_hw_addr_inherit(dev, real_dev);
3469 if (is_zero_ether_addr(dev->broadcast))
3470 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3471
3472 /* Get macsec's reference to real_dev */
3473 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL);
3474
3475 return 0;
3476 }
3477
macsec_dev_uninit(struct net_device * dev)3478 static void macsec_dev_uninit(struct net_device *dev)
3479 {
3480 struct macsec_dev *macsec = macsec_priv(dev);
3481
3482 gro_cells_destroy(&macsec->gro_cells);
3483 free_percpu(dev->tstats);
3484 }
3485
macsec_fix_features(struct net_device * dev,netdev_features_t features)3486 static netdev_features_t macsec_fix_features(struct net_device *dev,
3487 netdev_features_t features)
3488 {
3489 struct macsec_dev *macsec = macsec_priv(dev);
3490 struct net_device *real_dev = macsec->real_dev;
3491
3492 features &= (real_dev->features & MACSEC_FEATURES) |
3493 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3494 features |= NETIF_F_LLTX;
3495
3496 return features;
3497 }
3498
macsec_dev_open(struct net_device * dev)3499 static int macsec_dev_open(struct net_device *dev)
3500 {
3501 struct macsec_dev *macsec = macsec_priv(dev);
3502 struct net_device *real_dev = macsec->real_dev;
3503 int err;
3504
3505 err = dev_uc_add(real_dev, dev->dev_addr);
3506 if (err < 0)
3507 return err;
3508
3509 if (dev->flags & IFF_ALLMULTI) {
3510 err = dev_set_allmulti(real_dev, 1);
3511 if (err < 0)
3512 goto del_unicast;
3513 }
3514
3515 if (dev->flags & IFF_PROMISC) {
3516 err = dev_set_promiscuity(real_dev, 1);
3517 if (err < 0)
3518 goto clear_allmulti;
3519 }
3520
3521 /* If h/w offloading is available, propagate to the device */
3522 if (macsec_is_offloaded(macsec)) {
3523 const struct macsec_ops *ops;
3524 struct macsec_context ctx;
3525
3526 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3527 if (!ops) {
3528 err = -EOPNOTSUPP;
3529 goto clear_allmulti;
3530 }
3531
3532 ctx.secy = &macsec->secy;
3533 err = macsec_offload(ops->mdo_dev_open, &ctx);
3534 if (err)
3535 goto clear_allmulti;
3536 }
3537
3538 if (netif_carrier_ok(real_dev))
3539 netif_carrier_on(dev);
3540
3541 return 0;
3542 clear_allmulti:
3543 if (dev->flags & IFF_ALLMULTI)
3544 dev_set_allmulti(real_dev, -1);
3545 del_unicast:
3546 dev_uc_del(real_dev, dev->dev_addr);
3547 netif_carrier_off(dev);
3548 return err;
3549 }
3550
macsec_dev_stop(struct net_device * dev)3551 static int macsec_dev_stop(struct net_device *dev)
3552 {
3553 struct macsec_dev *macsec = macsec_priv(dev);
3554 struct net_device *real_dev = macsec->real_dev;
3555
3556 netif_carrier_off(dev);
3557
3558 /* If h/w offloading is available, propagate to the device */
3559 if (macsec_is_offloaded(macsec)) {
3560 const struct macsec_ops *ops;
3561 struct macsec_context ctx;
3562
3563 ops = macsec_get_ops(macsec, &ctx);
3564 if (ops) {
3565 ctx.secy = &macsec->secy;
3566 macsec_offload(ops->mdo_dev_stop, &ctx);
3567 }
3568 }
3569
3570 dev_mc_unsync(real_dev, dev);
3571 dev_uc_unsync(real_dev, dev);
3572
3573 if (dev->flags & IFF_ALLMULTI)
3574 dev_set_allmulti(real_dev, -1);
3575
3576 if (dev->flags & IFF_PROMISC)
3577 dev_set_promiscuity(real_dev, -1);
3578
3579 dev_uc_del(real_dev, dev->dev_addr);
3580
3581 return 0;
3582 }
3583
macsec_dev_change_rx_flags(struct net_device * dev,int change)3584 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3585 {
3586 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3587
3588 if (!(dev->flags & IFF_UP))
3589 return;
3590
3591 if (change & IFF_ALLMULTI)
3592 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3593
3594 if (change & IFF_PROMISC)
3595 dev_set_promiscuity(real_dev,
3596 dev->flags & IFF_PROMISC ? 1 : -1);
3597 }
3598
macsec_dev_set_rx_mode(struct net_device * dev)3599 static void macsec_dev_set_rx_mode(struct net_device *dev)
3600 {
3601 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3602
3603 dev_mc_sync(real_dev, dev);
3604 dev_uc_sync(real_dev, dev);
3605 }
3606
macsec_set_mac_address(struct net_device * dev,void * p)3607 static int macsec_set_mac_address(struct net_device *dev, void *p)
3608 {
3609 struct macsec_dev *macsec = macsec_priv(dev);
3610 struct net_device *real_dev = macsec->real_dev;
3611 struct sockaddr *addr = p;
3612 int err;
3613
3614 if (!is_valid_ether_addr(addr->sa_data))
3615 return -EADDRNOTAVAIL;
3616
3617 if (!(dev->flags & IFF_UP))
3618 goto out;
3619
3620 err = dev_uc_add(real_dev, addr->sa_data);
3621 if (err < 0)
3622 return err;
3623
3624 dev_uc_del(real_dev, dev->dev_addr);
3625
3626 out:
3627 eth_hw_addr_set(dev, addr->sa_data);
3628
3629 /* If h/w offloading is available, propagate to the device */
3630 if (macsec_is_offloaded(macsec)) {
3631 const struct macsec_ops *ops;
3632 struct macsec_context ctx;
3633
3634 ops = macsec_get_ops(macsec, &ctx);
3635 if (ops) {
3636 ctx.secy = &macsec->secy;
3637 macsec_offload(ops->mdo_upd_secy, &ctx);
3638 }
3639 }
3640
3641 return 0;
3642 }
3643
macsec_change_mtu(struct net_device * dev,int new_mtu)3644 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3645 {
3646 struct macsec_dev *macsec = macsec_priv(dev);
3647 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3648
3649 if (macsec->real_dev->mtu - extra < new_mtu)
3650 return -ERANGE;
3651
3652 dev->mtu = new_mtu;
3653
3654 return 0;
3655 }
3656
macsec_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * s)3657 static void macsec_get_stats64(struct net_device *dev,
3658 struct rtnl_link_stats64 *s)
3659 {
3660 if (!dev->tstats)
3661 return;
3662
3663 dev_fetch_sw_netstats(s, dev->tstats);
3664
3665 s->rx_dropped = DEV_STATS_READ(dev, rx_dropped);
3666 s->tx_dropped = DEV_STATS_READ(dev, tx_dropped);
3667 s->rx_errors = DEV_STATS_READ(dev, rx_errors);
3668 }
3669
macsec_get_iflink(const struct net_device * dev)3670 static int macsec_get_iflink(const struct net_device *dev)
3671 {
3672 return macsec_priv(dev)->real_dev->ifindex;
3673 }
3674
3675 static const struct net_device_ops macsec_netdev_ops = {
3676 .ndo_init = macsec_dev_init,
3677 .ndo_uninit = macsec_dev_uninit,
3678 .ndo_open = macsec_dev_open,
3679 .ndo_stop = macsec_dev_stop,
3680 .ndo_fix_features = macsec_fix_features,
3681 .ndo_change_mtu = macsec_change_mtu,
3682 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
3683 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
3684 .ndo_set_mac_address = macsec_set_mac_address,
3685 .ndo_start_xmit = macsec_start_xmit,
3686 .ndo_get_stats64 = macsec_get_stats64,
3687 .ndo_get_iflink = macsec_get_iflink,
3688 };
3689
3690 static const struct device_type macsec_type = {
3691 .name = "macsec",
3692 };
3693
3694 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3695 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3696 [IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3697 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3698 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3699 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3700 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3701 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3702 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3703 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3704 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3705 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3706 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3707 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3708 [IFLA_MACSEC_OFFLOAD] = { .type = NLA_U8 },
3709 };
3710
macsec_free_netdev(struct net_device * dev)3711 static void macsec_free_netdev(struct net_device *dev)
3712 {
3713 struct macsec_dev *macsec = macsec_priv(dev);
3714
3715 if (macsec->secy.tx_sc.md_dst)
3716 metadata_dst_free(macsec->secy.tx_sc.md_dst);
3717 free_percpu(macsec->stats);
3718 free_percpu(macsec->secy.tx_sc.stats);
3719
3720 /* Get rid of the macsec's reference to real_dev */
3721 netdev_put(macsec->real_dev, &macsec->dev_tracker);
3722 }
3723
macsec_setup(struct net_device * dev)3724 static void macsec_setup(struct net_device *dev)
3725 {
3726 ether_setup(dev);
3727 dev->min_mtu = 0;
3728 dev->max_mtu = ETH_MAX_MTU;
3729 dev->priv_flags |= IFF_NO_QUEUE;
3730 dev->netdev_ops = &macsec_netdev_ops;
3731 dev->needs_free_netdev = true;
3732 dev->priv_destructor = macsec_free_netdev;
3733 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3734
3735 eth_zero_addr(dev->broadcast);
3736 }
3737
macsec_changelink_common(struct net_device * dev,struct nlattr * data[])3738 static int macsec_changelink_common(struct net_device *dev,
3739 struct nlattr *data[])
3740 {
3741 struct macsec_secy *secy;
3742 struct macsec_tx_sc *tx_sc;
3743
3744 secy = &macsec_priv(dev)->secy;
3745 tx_sc = &secy->tx_sc;
3746
3747 if (data[IFLA_MACSEC_ENCODING_SA]) {
3748 struct macsec_tx_sa *tx_sa;
3749
3750 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3751 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3752
3753 secy->operational = tx_sa && tx_sa->active;
3754 }
3755
3756 if (data[IFLA_MACSEC_ENCRYPT])
3757 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3758
3759 if (data[IFLA_MACSEC_PROTECT])
3760 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3761
3762 if (data[IFLA_MACSEC_INC_SCI])
3763 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3764
3765 if (data[IFLA_MACSEC_ES])
3766 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3767
3768 if (data[IFLA_MACSEC_SCB])
3769 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3770
3771 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3772 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3773
3774 if (data[IFLA_MACSEC_VALIDATION])
3775 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3776
3777 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3778 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3779 case MACSEC_CIPHER_ID_GCM_AES_128:
3780 case MACSEC_DEFAULT_CIPHER_ID:
3781 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3782 secy->xpn = false;
3783 break;
3784 case MACSEC_CIPHER_ID_GCM_AES_256:
3785 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3786 secy->xpn = false;
3787 break;
3788 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
3789 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3790 secy->xpn = true;
3791 break;
3792 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
3793 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3794 secy->xpn = true;
3795 break;
3796 default:
3797 return -EINVAL;
3798 }
3799 }
3800
3801 if (data[IFLA_MACSEC_WINDOW]) {
3802 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3803
3804 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window
3805 * for XPN cipher suites */
3806 if (secy->xpn &&
3807 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW)
3808 return -EINVAL;
3809 }
3810
3811 return 0;
3812 }
3813
macsec_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)3814 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3815 struct nlattr *data[],
3816 struct netlink_ext_ack *extack)
3817 {
3818 struct macsec_dev *macsec = macsec_priv(dev);
3819 struct macsec_tx_sc tx_sc;
3820 struct macsec_secy secy;
3821 int ret;
3822
3823 if (!data)
3824 return 0;
3825
3826 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3827 data[IFLA_MACSEC_ICV_LEN] ||
3828 data[IFLA_MACSEC_SCI] ||
3829 data[IFLA_MACSEC_PORT])
3830 return -EINVAL;
3831
3832 /* Keep a copy of unmodified secy and tx_sc, in case the offload
3833 * propagation fails, to revert macsec_changelink_common.
3834 */
3835 memcpy(&secy, &macsec->secy, sizeof(secy));
3836 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3837
3838 ret = macsec_changelink_common(dev, data);
3839 if (ret)
3840 goto cleanup;
3841
3842 /* If h/w offloading is available, propagate to the device */
3843 if (macsec_is_offloaded(macsec)) {
3844 const struct macsec_ops *ops;
3845 struct macsec_context ctx;
3846
3847 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3848 if (!ops) {
3849 ret = -EOPNOTSUPP;
3850 goto cleanup;
3851 }
3852
3853 ctx.secy = &macsec->secy;
3854 ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3855 if (ret)
3856 goto cleanup;
3857 }
3858
3859 return 0;
3860
3861 cleanup:
3862 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3863 memcpy(&macsec->secy, &secy, sizeof(secy));
3864
3865 return ret;
3866 }
3867
macsec_del_dev(struct macsec_dev * macsec)3868 static void macsec_del_dev(struct macsec_dev *macsec)
3869 {
3870 int i;
3871
3872 while (macsec->secy.rx_sc) {
3873 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3874
3875 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3876 free_rx_sc(rx_sc);
3877 }
3878
3879 for (i = 0; i < MACSEC_NUM_AN; i++) {
3880 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3881
3882 if (sa) {
3883 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3884 clear_tx_sa(sa);
3885 }
3886 }
3887 }
3888
macsec_common_dellink(struct net_device * dev,struct list_head * head)3889 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3890 {
3891 struct macsec_dev *macsec = macsec_priv(dev);
3892 struct net_device *real_dev = macsec->real_dev;
3893
3894 /* If h/w offloading is available, propagate to the device */
3895 if (macsec_is_offloaded(macsec)) {
3896 const struct macsec_ops *ops;
3897 struct macsec_context ctx;
3898
3899 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3900 if (ops) {
3901 ctx.secy = &macsec->secy;
3902 macsec_offload(ops->mdo_del_secy, &ctx);
3903 }
3904 }
3905
3906 unregister_netdevice_queue(dev, head);
3907 list_del_rcu(&macsec->secys);
3908 macsec_del_dev(macsec);
3909 netdev_upper_dev_unlink(real_dev, dev);
3910
3911 macsec_generation++;
3912 }
3913
macsec_dellink(struct net_device * dev,struct list_head * head)3914 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3915 {
3916 struct macsec_dev *macsec = macsec_priv(dev);
3917 struct net_device *real_dev = macsec->real_dev;
3918 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3919
3920 macsec_common_dellink(dev, head);
3921
3922 if (list_empty(&rxd->secys)) {
3923 netdev_rx_handler_unregister(real_dev);
3924 kfree(rxd);
3925 }
3926 }
3927
register_macsec_dev(struct net_device * real_dev,struct net_device * dev)3928 static int register_macsec_dev(struct net_device *real_dev,
3929 struct net_device *dev)
3930 {
3931 struct macsec_dev *macsec = macsec_priv(dev);
3932 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3933
3934 if (!rxd) {
3935 int err;
3936
3937 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3938 if (!rxd)
3939 return -ENOMEM;
3940
3941 INIT_LIST_HEAD(&rxd->secys);
3942
3943 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3944 rxd);
3945 if (err < 0) {
3946 kfree(rxd);
3947 return err;
3948 }
3949 }
3950
3951 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3952 return 0;
3953 }
3954
sci_exists(struct net_device * dev,sci_t sci)3955 static bool sci_exists(struct net_device *dev, sci_t sci)
3956 {
3957 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3958 struct macsec_dev *macsec;
3959
3960 list_for_each_entry(macsec, &rxd->secys, secys) {
3961 if (macsec->secy.sci == sci)
3962 return true;
3963 }
3964
3965 return false;
3966 }
3967
dev_to_sci(struct net_device * dev,__be16 port)3968 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3969 {
3970 return make_sci(dev->dev_addr, port);
3971 }
3972
macsec_add_dev(struct net_device * dev,sci_t sci,u8 icv_len)3973 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3974 {
3975 struct macsec_dev *macsec = macsec_priv(dev);
3976 struct macsec_secy *secy = &macsec->secy;
3977
3978 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3979 if (!macsec->stats)
3980 return -ENOMEM;
3981
3982 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3983 if (!secy->tx_sc.stats)
3984 return -ENOMEM;
3985
3986 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL);
3987 if (!secy->tx_sc.md_dst)
3988 /* macsec and secy percpu stats will be freed when unregistering
3989 * net_device in macsec_free_netdev()
3990 */
3991 return -ENOMEM;
3992
3993 if (sci == MACSEC_UNDEF_SCI)
3994 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3995
3996 secy->netdev = dev;
3997 secy->operational = true;
3998 secy->key_len = DEFAULT_SAK_LEN;
3999 secy->icv_len = icv_len;
4000 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
4001 secy->protect_frames = true;
4002 secy->replay_protect = false;
4003 secy->xpn = DEFAULT_XPN;
4004
4005 secy->sci = sci;
4006 secy->tx_sc.md_dst->u.macsec_info.sci = sci;
4007 secy->tx_sc.active = true;
4008 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
4009 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
4010 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
4011 secy->tx_sc.end_station = false;
4012 secy->tx_sc.scb = false;
4013
4014 return 0;
4015 }
4016
4017 static struct lock_class_key macsec_netdev_addr_lock_key;
4018
macsec_newlink(struct net * net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)4019 static int macsec_newlink(struct net *net, struct net_device *dev,
4020 struct nlattr *tb[], struct nlattr *data[],
4021 struct netlink_ext_ack *extack)
4022 {
4023 struct macsec_dev *macsec = macsec_priv(dev);
4024 rx_handler_func_t *rx_handler;
4025 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4026 struct net_device *real_dev;
4027 int err, mtu;
4028 sci_t sci;
4029
4030 if (!tb[IFLA_LINK])
4031 return -EINVAL;
4032 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
4033 if (!real_dev)
4034 return -ENODEV;
4035 if (real_dev->type != ARPHRD_ETHER)
4036 return -EINVAL;
4037
4038 dev->priv_flags |= IFF_MACSEC;
4039
4040 macsec->real_dev = real_dev;
4041
4042 if (data && data[IFLA_MACSEC_OFFLOAD])
4043 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
4044 else
4045 /* MACsec offloading is off by default */
4046 macsec->offload = MACSEC_OFFLOAD_OFF;
4047
4048 /* Check if the offloading mode is supported by the underlying layers */
4049 if (macsec->offload != MACSEC_OFFLOAD_OFF &&
4050 !macsec_check_offload(macsec->offload, macsec))
4051 return -EOPNOTSUPP;
4052
4053 /* send_sci must be set to true when transmit sci explicitly is set */
4054 if ((data && data[IFLA_MACSEC_SCI]) &&
4055 (data && data[IFLA_MACSEC_INC_SCI])) {
4056 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
4057
4058 if (!send_sci)
4059 return -EINVAL;
4060 }
4061
4062 if (data && data[IFLA_MACSEC_ICV_LEN])
4063 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4064 mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
4065 if (mtu < 0)
4066 dev->mtu = 0;
4067 else
4068 dev->mtu = mtu;
4069
4070 rx_handler = rtnl_dereference(real_dev->rx_handler);
4071 if (rx_handler && rx_handler != macsec_handle_frame)
4072 return -EBUSY;
4073
4074 err = register_netdevice(dev);
4075 if (err < 0)
4076 return err;
4077
4078 netdev_lockdep_set_classes(dev);
4079 lockdep_set_class(&dev->addr_list_lock,
4080 &macsec_netdev_addr_lock_key);
4081
4082 err = netdev_upper_dev_link(real_dev, dev, extack);
4083 if (err < 0)
4084 goto unregister;
4085
4086 /* need to be already registered so that ->init has run and
4087 * the MAC addr is set
4088 */
4089 if (data && data[IFLA_MACSEC_SCI])
4090 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
4091 else if (data && data[IFLA_MACSEC_PORT])
4092 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
4093 else
4094 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4095
4096 if (rx_handler && sci_exists(real_dev, sci)) {
4097 err = -EBUSY;
4098 goto unlink;
4099 }
4100
4101 err = macsec_add_dev(dev, sci, icv_len);
4102 if (err)
4103 goto unlink;
4104
4105 if (data) {
4106 err = macsec_changelink_common(dev, data);
4107 if (err)
4108 goto del_dev;
4109 }
4110
4111 /* If h/w offloading is available, propagate to the device */
4112 if (macsec_is_offloaded(macsec)) {
4113 const struct macsec_ops *ops;
4114 struct macsec_context ctx;
4115
4116 ops = macsec_get_ops(macsec, &ctx);
4117 if (ops) {
4118 ctx.secy = &macsec->secy;
4119 err = macsec_offload(ops->mdo_add_secy, &ctx);
4120 if (err)
4121 goto del_dev;
4122 }
4123 }
4124
4125 err = register_macsec_dev(real_dev, dev);
4126 if (err < 0)
4127 goto del_dev;
4128
4129 netif_stacked_transfer_operstate(real_dev, dev);
4130 linkwatch_fire_event(dev);
4131
4132 macsec_generation++;
4133
4134 return 0;
4135
4136 del_dev:
4137 macsec_del_dev(macsec);
4138 unlink:
4139 netdev_upper_dev_unlink(real_dev, dev);
4140 unregister:
4141 unregister_netdevice(dev);
4142 return err;
4143 }
4144
macsec_validate_attr(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)4145 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
4146 struct netlink_ext_ack *extack)
4147 {
4148 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
4149 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4150 int flag;
4151 bool es, scb, sci;
4152
4153 if (!data)
4154 return 0;
4155
4156 if (data[IFLA_MACSEC_CIPHER_SUITE])
4157 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
4158
4159 if (data[IFLA_MACSEC_ICV_LEN]) {
4160 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4161 if (icv_len != MACSEC_DEFAULT_ICV_LEN) {
4162 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
4163 struct crypto_aead *dummy_tfm;
4164
4165 dummy_tfm = macsec_alloc_tfm(dummy_key,
4166 DEFAULT_SAK_LEN,
4167 icv_len);
4168 if (IS_ERR(dummy_tfm))
4169 return PTR_ERR(dummy_tfm);
4170 crypto_free_aead(dummy_tfm);
4171 }
4172 }
4173
4174 switch (csid) {
4175 case MACSEC_CIPHER_ID_GCM_AES_128:
4176 case MACSEC_CIPHER_ID_GCM_AES_256:
4177 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
4178 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
4179 case MACSEC_DEFAULT_CIPHER_ID:
4180 if (icv_len < MACSEC_MIN_ICV_LEN ||
4181 icv_len > MACSEC_STD_ICV_LEN)
4182 return -EINVAL;
4183 break;
4184 default:
4185 return -EINVAL;
4186 }
4187
4188 if (data[IFLA_MACSEC_ENCODING_SA]) {
4189 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
4190 return -EINVAL;
4191 }
4192
4193 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
4194 flag < IFLA_MACSEC_VALIDATION;
4195 flag++) {
4196 if (data[flag]) {
4197 if (nla_get_u8(data[flag]) > 1)
4198 return -EINVAL;
4199 }
4200 }
4201
4202 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
4203 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
4204 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
4205
4206 if ((sci && (scb || es)) || (scb && es))
4207 return -EINVAL;
4208
4209 if (data[IFLA_MACSEC_VALIDATION] &&
4210 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
4211 return -EINVAL;
4212
4213 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
4214 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
4215 !data[IFLA_MACSEC_WINDOW])
4216 return -EINVAL;
4217
4218 return 0;
4219 }
4220
macsec_get_link_net(const struct net_device * dev)4221 static struct net *macsec_get_link_net(const struct net_device *dev)
4222 {
4223 return dev_net(macsec_priv(dev)->real_dev);
4224 }
4225
macsec_get_size(const struct net_device * dev)4226 static size_t macsec_get_size(const struct net_device *dev)
4227 {
4228 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
4229 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
4230 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
4231 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
4232 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
4233 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
4234 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
4235 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
4236 nla_total_size(1) + /* IFLA_MACSEC_ES */
4237 nla_total_size(1) + /* IFLA_MACSEC_SCB */
4238 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
4239 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
4240 0;
4241 }
4242
macsec_fill_info(struct sk_buff * skb,const struct net_device * dev)4243 static int macsec_fill_info(struct sk_buff *skb,
4244 const struct net_device *dev)
4245 {
4246 struct macsec_secy *secy = &macsec_priv(dev)->secy;
4247 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
4248 u64 csid;
4249
4250 switch (secy->key_len) {
4251 case MACSEC_GCM_AES_128_SAK_LEN:
4252 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
4253 break;
4254 case MACSEC_GCM_AES_256_SAK_LEN:
4255 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
4256 break;
4257 default:
4258 goto nla_put_failure;
4259 }
4260
4261 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
4262 IFLA_MACSEC_PAD) ||
4263 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
4264 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
4265 csid, IFLA_MACSEC_PAD) ||
4266 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
4267 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
4268 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
4269 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
4270 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
4271 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
4272 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
4273 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
4274 0)
4275 goto nla_put_failure;
4276
4277 if (secy->replay_protect) {
4278 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
4279 goto nla_put_failure;
4280 }
4281
4282 return 0;
4283
4284 nla_put_failure:
4285 return -EMSGSIZE;
4286 }
4287
4288 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
4289 .kind = "macsec",
4290 .priv_size = sizeof(struct macsec_dev),
4291 .maxtype = IFLA_MACSEC_MAX,
4292 .policy = macsec_rtnl_policy,
4293 .setup = macsec_setup,
4294 .validate = macsec_validate_attr,
4295 .newlink = macsec_newlink,
4296 .changelink = macsec_changelink,
4297 .dellink = macsec_dellink,
4298 .get_size = macsec_get_size,
4299 .fill_info = macsec_fill_info,
4300 .get_link_net = macsec_get_link_net,
4301 };
4302
is_macsec_master(struct net_device * dev)4303 static bool is_macsec_master(struct net_device *dev)
4304 {
4305 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
4306 }
4307
macsec_notify(struct notifier_block * this,unsigned long event,void * ptr)4308 static int macsec_notify(struct notifier_block *this, unsigned long event,
4309 void *ptr)
4310 {
4311 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
4312 LIST_HEAD(head);
4313
4314 if (!is_macsec_master(real_dev))
4315 return NOTIFY_DONE;
4316
4317 switch (event) {
4318 case NETDEV_DOWN:
4319 case NETDEV_UP:
4320 case NETDEV_CHANGE: {
4321 struct macsec_dev *m, *n;
4322 struct macsec_rxh_data *rxd;
4323
4324 rxd = macsec_data_rtnl(real_dev);
4325 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4326 struct net_device *dev = m->secy.netdev;
4327
4328 netif_stacked_transfer_operstate(real_dev, dev);
4329 }
4330 break;
4331 }
4332 case NETDEV_UNREGISTER: {
4333 struct macsec_dev *m, *n;
4334 struct macsec_rxh_data *rxd;
4335
4336 rxd = macsec_data_rtnl(real_dev);
4337 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4338 macsec_common_dellink(m->secy.netdev, &head);
4339 }
4340
4341 netdev_rx_handler_unregister(real_dev);
4342 kfree(rxd);
4343
4344 unregister_netdevice_many(&head);
4345 break;
4346 }
4347 case NETDEV_CHANGEMTU: {
4348 struct macsec_dev *m;
4349 struct macsec_rxh_data *rxd;
4350
4351 rxd = macsec_data_rtnl(real_dev);
4352 list_for_each_entry(m, &rxd->secys, secys) {
4353 struct net_device *dev = m->secy.netdev;
4354 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
4355 macsec_extra_len(true));
4356
4357 if (dev->mtu > mtu)
4358 dev_set_mtu(dev, mtu);
4359 }
4360 }
4361 }
4362
4363 return NOTIFY_OK;
4364 }
4365
4366 static struct notifier_block macsec_notifier = {
4367 .notifier_call = macsec_notify,
4368 };
4369
macsec_init(void)4370 static int __init macsec_init(void)
4371 {
4372 int err;
4373
4374 pr_info("MACsec IEEE 802.1AE\n");
4375 err = register_netdevice_notifier(&macsec_notifier);
4376 if (err)
4377 return err;
4378
4379 err = rtnl_link_register(&macsec_link_ops);
4380 if (err)
4381 goto notifier;
4382
4383 err = genl_register_family(&macsec_fam);
4384 if (err)
4385 goto rtnl;
4386
4387 return 0;
4388
4389 rtnl:
4390 rtnl_link_unregister(&macsec_link_ops);
4391 notifier:
4392 unregister_netdevice_notifier(&macsec_notifier);
4393 return err;
4394 }
4395
macsec_exit(void)4396 static void __exit macsec_exit(void)
4397 {
4398 genl_unregister_family(&macsec_fam);
4399 rtnl_link_unregister(&macsec_link_ops);
4400 unregister_netdevice_notifier(&macsec_notifier);
4401 rcu_barrier();
4402 }
4403
4404 module_init(macsec_init);
4405 module_exit(macsec_exit);
4406
4407 MODULE_ALIAS_RTNL_LINK("macsec");
4408 MODULE_ALIAS_GENL_FAMILY("macsec");
4409
4410 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
4411 MODULE_LICENSE("GPL v2");
4412