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 dev_sw_netstats_tx_add(dev, 1, len);
523 }
524
macsec_encrypt_done(void * data,int err)525 static void macsec_encrypt_done(void *data, int err)
526 {
527 struct sk_buff *skb = data;
528 struct net_device *dev = skb->dev;
529 struct macsec_dev *macsec = macsec_priv(dev);
530 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
531 int len, ret;
532
533 aead_request_free(macsec_skb_cb(skb)->req);
534
535 rcu_read_lock_bh();
536 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
537 /* packet is encrypted/protected so tx_bytes must be calculated */
538 len = macsec_msdu_len(skb) + 2 * ETH_ALEN;
539 macsec_encrypt_finish(skb, dev);
540 ret = dev_queue_xmit(skb);
541 count_tx(dev, ret, len);
542 rcu_read_unlock_bh();
543
544 macsec_txsa_put(sa);
545 dev_put(dev);
546 }
547
macsec_alloc_req(struct crypto_aead * tfm,unsigned char ** iv,struct scatterlist ** sg,int num_frags)548 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
549 unsigned char **iv,
550 struct scatterlist **sg,
551 int num_frags)
552 {
553 size_t size, iv_offset, sg_offset;
554 struct aead_request *req;
555 void *tmp;
556
557 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
558 iv_offset = size;
559 size += GCM_AES_IV_LEN;
560
561 size = ALIGN(size, __alignof__(struct scatterlist));
562 sg_offset = size;
563 size += sizeof(struct scatterlist) * num_frags;
564
565 tmp = kmalloc(size, GFP_ATOMIC);
566 if (!tmp)
567 return NULL;
568
569 *iv = (unsigned char *)(tmp + iv_offset);
570 *sg = (struct scatterlist *)(tmp + sg_offset);
571 req = tmp;
572
573 aead_request_set_tfm(req, tfm);
574
575 return req;
576 }
577
macsec_encrypt(struct sk_buff * skb,struct net_device * dev)578 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
579 struct net_device *dev)
580 {
581 int ret;
582 struct scatterlist *sg;
583 struct sk_buff *trailer;
584 unsigned char *iv;
585 struct ethhdr *eth;
586 struct macsec_eth_header *hh;
587 size_t unprotected_len;
588 struct aead_request *req;
589 struct macsec_secy *secy;
590 struct macsec_tx_sc *tx_sc;
591 struct macsec_tx_sa *tx_sa;
592 struct macsec_dev *macsec = macsec_priv(dev);
593 bool sci_present;
594 pn_t pn;
595
596 secy = &macsec->secy;
597 tx_sc = &secy->tx_sc;
598
599 /* 10.5.1 TX SA assignment */
600 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
601 if (!tx_sa) {
602 secy->operational = false;
603 kfree_skb(skb);
604 return ERR_PTR(-EINVAL);
605 }
606
607 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
608 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
609 struct sk_buff *nskb = skb_copy_expand(skb,
610 MACSEC_NEEDED_HEADROOM,
611 MACSEC_NEEDED_TAILROOM,
612 GFP_ATOMIC);
613 if (likely(nskb)) {
614 consume_skb(skb);
615 skb = nskb;
616 } else {
617 macsec_txsa_put(tx_sa);
618 kfree_skb(skb);
619 return ERR_PTR(-ENOMEM);
620 }
621 } else {
622 skb = skb_unshare(skb, GFP_ATOMIC);
623 if (!skb) {
624 macsec_txsa_put(tx_sa);
625 return ERR_PTR(-ENOMEM);
626 }
627 }
628
629 unprotected_len = skb->len;
630 eth = eth_hdr(skb);
631 sci_present = macsec_send_sci(secy);
632 hh = skb_push(skb, macsec_extra_len(sci_present));
633 memmove(hh, eth, 2 * ETH_ALEN);
634
635 pn = tx_sa_update_pn(tx_sa, secy);
636 if (pn.full64 == 0) {
637 macsec_txsa_put(tx_sa);
638 kfree_skb(skb);
639 return ERR_PTR(-ENOLINK);
640 }
641 macsec_fill_sectag(hh, secy, pn.lower, sci_present);
642 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
643
644 skb_put(skb, secy->icv_len);
645
646 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
647 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
648
649 u64_stats_update_begin(&secy_stats->syncp);
650 secy_stats->stats.OutPktsTooLong++;
651 u64_stats_update_end(&secy_stats->syncp);
652
653 macsec_txsa_put(tx_sa);
654 kfree_skb(skb);
655 return ERR_PTR(-EINVAL);
656 }
657
658 ret = skb_cow_data(skb, 0, &trailer);
659 if (unlikely(ret < 0)) {
660 macsec_txsa_put(tx_sa);
661 kfree_skb(skb);
662 return ERR_PTR(ret);
663 }
664
665 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
666 if (!req) {
667 macsec_txsa_put(tx_sa);
668 kfree_skb(skb);
669 return ERR_PTR(-ENOMEM);
670 }
671
672 if (secy->xpn)
673 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt);
674 else
675 macsec_fill_iv(iv, secy->sci, pn.lower);
676
677 sg_init_table(sg, ret);
678 ret = skb_to_sgvec(skb, sg, 0, skb->len);
679 if (unlikely(ret < 0)) {
680 aead_request_free(req);
681 macsec_txsa_put(tx_sa);
682 kfree_skb(skb);
683 return ERR_PTR(ret);
684 }
685
686 if (tx_sc->encrypt) {
687 int len = skb->len - macsec_hdr_len(sci_present) -
688 secy->icv_len;
689 aead_request_set_crypt(req, sg, sg, len, iv);
690 aead_request_set_ad(req, macsec_hdr_len(sci_present));
691 } else {
692 aead_request_set_crypt(req, sg, sg, 0, iv);
693 aead_request_set_ad(req, skb->len - secy->icv_len);
694 }
695
696 macsec_skb_cb(skb)->req = req;
697 macsec_skb_cb(skb)->tx_sa = tx_sa;
698 macsec_skb_cb(skb)->has_sci = sci_present;
699 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
700
701 dev_hold(skb->dev);
702 ret = crypto_aead_encrypt(req);
703 if (ret == -EINPROGRESS) {
704 return ERR_PTR(ret);
705 } else if (ret != 0) {
706 dev_put(skb->dev);
707 kfree_skb(skb);
708 aead_request_free(req);
709 macsec_txsa_put(tx_sa);
710 return ERR_PTR(-EINVAL);
711 }
712
713 dev_put(skb->dev);
714 aead_request_free(req);
715 macsec_txsa_put(tx_sa);
716
717 return skb;
718 }
719
macsec_post_decrypt(struct sk_buff * skb,struct macsec_secy * secy,u32 pn)720 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
721 {
722 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
723 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
724 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
725 u32 lowest_pn = 0;
726
727 spin_lock(&rx_sa->lock);
728 if (rx_sa->next_pn_halves.lower >= secy->replay_window)
729 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
730
731 /* Now perform replay protection check again
732 * (see IEEE 802.1AE-2006 figure 10-5)
733 */
734 if (secy->replay_protect && pn < lowest_pn &&
735 (!secy->xpn || pn_same_half(pn, lowest_pn))) {
736 spin_unlock(&rx_sa->lock);
737 u64_stats_update_begin(&rxsc_stats->syncp);
738 rxsc_stats->stats.InPktsLate++;
739 u64_stats_update_end(&rxsc_stats->syncp);
740 DEV_STATS_INC(secy->netdev, rx_dropped);
741 return false;
742 }
743
744 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
745 unsigned int msdu_len = macsec_msdu_len(skb);
746 u64_stats_update_begin(&rxsc_stats->syncp);
747 if (hdr->tci_an & MACSEC_TCI_E)
748 rxsc_stats->stats.InOctetsDecrypted += msdu_len;
749 else
750 rxsc_stats->stats.InOctetsValidated += msdu_len;
751 u64_stats_update_end(&rxsc_stats->syncp);
752 }
753
754 if (!macsec_skb_cb(skb)->valid) {
755 spin_unlock(&rx_sa->lock);
756
757 /* 10.6.5 */
758 if (hdr->tci_an & MACSEC_TCI_C ||
759 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
760 u64_stats_update_begin(&rxsc_stats->syncp);
761 rxsc_stats->stats.InPktsNotValid++;
762 u64_stats_update_end(&rxsc_stats->syncp);
763 this_cpu_inc(rx_sa->stats->InPktsNotValid);
764 DEV_STATS_INC(secy->netdev, rx_errors);
765 return false;
766 }
767
768 u64_stats_update_begin(&rxsc_stats->syncp);
769 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
770 rxsc_stats->stats.InPktsInvalid++;
771 this_cpu_inc(rx_sa->stats->InPktsInvalid);
772 } else if (pn < lowest_pn) {
773 rxsc_stats->stats.InPktsDelayed++;
774 } else {
775 rxsc_stats->stats.InPktsUnchecked++;
776 }
777 u64_stats_update_end(&rxsc_stats->syncp);
778 } else {
779 u64_stats_update_begin(&rxsc_stats->syncp);
780 if (pn < lowest_pn) {
781 rxsc_stats->stats.InPktsDelayed++;
782 } else {
783 rxsc_stats->stats.InPktsOK++;
784 this_cpu_inc(rx_sa->stats->InPktsOK);
785 }
786 u64_stats_update_end(&rxsc_stats->syncp);
787
788 // Instead of "pn >=" - to support pn overflow in xpn
789 if (pn + 1 > rx_sa->next_pn_halves.lower) {
790 rx_sa->next_pn_halves.lower = pn + 1;
791 } else if (secy->xpn &&
792 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
793 rx_sa->next_pn_halves.upper++;
794 rx_sa->next_pn_halves.lower = pn + 1;
795 }
796
797 spin_unlock(&rx_sa->lock);
798 }
799
800 return true;
801 }
802
macsec_reset_skb(struct sk_buff * skb,struct net_device * dev)803 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
804 {
805 skb->pkt_type = PACKET_HOST;
806 skb->protocol = eth_type_trans(skb, dev);
807
808 skb_reset_network_header(skb);
809 if (!skb_transport_header_was_set(skb))
810 skb_reset_transport_header(skb);
811 skb_reset_mac_len(skb);
812 }
813
macsec_finalize_skb(struct sk_buff * skb,u8 icv_len,u8 hdr_len)814 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
815 {
816 skb->ip_summed = CHECKSUM_NONE;
817 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
818 skb_pull(skb, hdr_len);
819 pskb_trim_unique(skb, skb->len - icv_len);
820 }
821
count_rx(struct net_device * dev,int len)822 static void count_rx(struct net_device *dev, int len)
823 {
824 dev_sw_netstats_rx_add(dev, len);
825 }
826
macsec_decrypt_done(void * data,int err)827 static void macsec_decrypt_done(void *data, int err)
828 {
829 struct sk_buff *skb = data;
830 struct net_device *dev = skb->dev;
831 struct macsec_dev *macsec = macsec_priv(dev);
832 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
833 struct macsec_rx_sc *rx_sc = rx_sa->sc;
834 int len;
835 u32 pn;
836
837 aead_request_free(macsec_skb_cb(skb)->req);
838
839 if (!err)
840 macsec_skb_cb(skb)->valid = true;
841
842 rcu_read_lock_bh();
843 pn = ntohl(macsec_ethhdr(skb)->packet_number);
844 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
845 rcu_read_unlock_bh();
846 kfree_skb(skb);
847 goto out;
848 }
849
850 macsec_finalize_skb(skb, macsec->secy.icv_len,
851 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
852 len = skb->len;
853 macsec_reset_skb(skb, macsec->secy.netdev);
854
855 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
856 count_rx(dev, len);
857
858 rcu_read_unlock_bh();
859
860 out:
861 macsec_rxsa_put(rx_sa);
862 macsec_rxsc_put(rx_sc);
863 dev_put(dev);
864 }
865
macsec_decrypt(struct sk_buff * skb,struct net_device * dev,struct macsec_rx_sa * rx_sa,sci_t sci,struct macsec_secy * secy)866 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
867 struct net_device *dev,
868 struct macsec_rx_sa *rx_sa,
869 sci_t sci,
870 struct macsec_secy *secy)
871 {
872 int ret;
873 struct scatterlist *sg;
874 struct sk_buff *trailer;
875 unsigned char *iv;
876 struct aead_request *req;
877 struct macsec_eth_header *hdr;
878 u32 hdr_pn;
879 u16 icv_len = secy->icv_len;
880
881 macsec_skb_cb(skb)->valid = false;
882 skb = skb_share_check(skb, GFP_ATOMIC);
883 if (!skb)
884 return ERR_PTR(-ENOMEM);
885
886 ret = skb_cow_data(skb, 0, &trailer);
887 if (unlikely(ret < 0)) {
888 kfree_skb(skb);
889 return ERR_PTR(ret);
890 }
891 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
892 if (!req) {
893 kfree_skb(skb);
894 return ERR_PTR(-ENOMEM);
895 }
896
897 hdr = (struct macsec_eth_header *)skb->data;
898 hdr_pn = ntohl(hdr->packet_number);
899
900 if (secy->xpn) {
901 pn_t recovered_pn = rx_sa->next_pn_halves;
902
903 recovered_pn.lower = hdr_pn;
904 if (hdr_pn < rx_sa->next_pn_halves.lower &&
905 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
906 recovered_pn.upper++;
907
908 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
909 rx_sa->key.salt);
910 } else {
911 macsec_fill_iv(iv, sci, hdr_pn);
912 }
913
914 sg_init_table(sg, ret);
915 ret = skb_to_sgvec(skb, sg, 0, skb->len);
916 if (unlikely(ret < 0)) {
917 aead_request_free(req);
918 kfree_skb(skb);
919 return ERR_PTR(ret);
920 }
921
922 if (hdr->tci_an & MACSEC_TCI_E) {
923 /* confidentiality: ethernet + macsec header
924 * authenticated, encrypted payload
925 */
926 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
927
928 aead_request_set_crypt(req, sg, sg, len, iv);
929 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
930 skb = skb_unshare(skb, GFP_ATOMIC);
931 if (!skb) {
932 aead_request_free(req);
933 return ERR_PTR(-ENOMEM);
934 }
935 } else {
936 /* integrity only: all headers + data authenticated */
937 aead_request_set_crypt(req, sg, sg, icv_len, iv);
938 aead_request_set_ad(req, skb->len - icv_len);
939 }
940
941 macsec_skb_cb(skb)->req = req;
942 skb->dev = dev;
943 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
944
945 dev_hold(dev);
946 ret = crypto_aead_decrypt(req);
947 if (ret == -EINPROGRESS) {
948 return ERR_PTR(ret);
949 } else if (ret != 0) {
950 /* decryption/authentication failed
951 * 10.6 if validateFrames is disabled, deliver anyway
952 */
953 if (ret != -EBADMSG) {
954 kfree_skb(skb);
955 skb = ERR_PTR(ret);
956 }
957 } else {
958 macsec_skb_cb(skb)->valid = true;
959 }
960 dev_put(dev);
961
962 aead_request_free(req);
963
964 return skb;
965 }
966
find_rx_sc(struct macsec_secy * secy,sci_t sci)967 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
968 {
969 struct macsec_rx_sc *rx_sc;
970
971 for_each_rxsc(secy, rx_sc) {
972 if (rx_sc->sci == sci)
973 return rx_sc;
974 }
975
976 return NULL;
977 }
978
find_rx_sc_rtnl(struct macsec_secy * secy,sci_t sci)979 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
980 {
981 struct macsec_rx_sc *rx_sc;
982
983 for_each_rxsc_rtnl(secy, rx_sc) {
984 if (rx_sc->sci == sci)
985 return rx_sc;
986 }
987
988 return NULL;
989 }
990
handle_not_macsec(struct sk_buff * skb)991 static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
992 {
993 /* Deliver to the uncontrolled port by default */
994 enum rx_handler_result ret = RX_HANDLER_PASS;
995 struct ethhdr *hdr = eth_hdr(skb);
996 struct metadata_dst *md_dst;
997 struct macsec_rxh_data *rxd;
998 struct macsec_dev *macsec;
999
1000 rcu_read_lock();
1001 rxd = macsec_data_rcu(skb->dev);
1002 md_dst = skb_metadata_dst(skb);
1003
1004 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1005 struct sk_buff *nskb;
1006 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1007 struct net_device *ndev = macsec->secy.netdev;
1008
1009 /* If h/w offloading is enabled, HW decodes frames and strips
1010 * the SecTAG, so we have to deduce which port to deliver to.
1011 */
1012 if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
1013 struct macsec_rx_sc *rx_sc = NULL;
1014
1015 if (md_dst && md_dst->type == METADATA_MACSEC)
1016 rx_sc = find_rx_sc(&macsec->secy, md_dst->u.macsec_info.sci);
1017
1018 if (md_dst && md_dst->type == METADATA_MACSEC && !rx_sc)
1019 continue;
1020
1021 if (ether_addr_equal_64bits(hdr->h_dest,
1022 ndev->dev_addr)) {
1023 /* exact match, divert skb to this port */
1024 skb->dev = ndev;
1025 skb->pkt_type = PACKET_HOST;
1026 ret = RX_HANDLER_ANOTHER;
1027 goto out;
1028 } else if (is_multicast_ether_addr_64bits(
1029 hdr->h_dest)) {
1030 /* multicast frame, deliver on this port too */
1031 nskb = skb_clone(skb, GFP_ATOMIC);
1032 if (!nskb)
1033 break;
1034
1035 nskb->dev = ndev;
1036 if (ether_addr_equal_64bits(hdr->h_dest,
1037 ndev->broadcast))
1038 nskb->pkt_type = PACKET_BROADCAST;
1039 else
1040 nskb->pkt_type = PACKET_MULTICAST;
1041
1042 __netif_rx(nskb);
1043 } else if (rx_sc || ndev->flags & IFF_PROMISC) {
1044 skb->dev = ndev;
1045 skb->pkt_type = PACKET_HOST;
1046 ret = RX_HANDLER_ANOTHER;
1047 goto out;
1048 }
1049
1050 continue;
1051 }
1052
1053 /* 10.6 If the management control validateFrames is not
1054 * Strict, frames without a SecTAG are received, counted, and
1055 * delivered to the Controlled Port
1056 */
1057 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1058 u64_stats_update_begin(&secy_stats->syncp);
1059 secy_stats->stats.InPktsNoTag++;
1060 u64_stats_update_end(&secy_stats->syncp);
1061 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1062 continue;
1063 }
1064
1065 /* deliver on this port */
1066 nskb = skb_clone(skb, GFP_ATOMIC);
1067 if (!nskb)
1068 break;
1069
1070 nskb->dev = ndev;
1071
1072 if (__netif_rx(nskb) == NET_RX_SUCCESS) {
1073 u64_stats_update_begin(&secy_stats->syncp);
1074 secy_stats->stats.InPktsUntagged++;
1075 u64_stats_update_end(&secy_stats->syncp);
1076 }
1077 }
1078
1079 out:
1080 rcu_read_unlock();
1081 return ret;
1082 }
1083
macsec_handle_frame(struct sk_buff ** pskb)1084 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1085 {
1086 struct sk_buff *skb = *pskb;
1087 struct net_device *dev = skb->dev;
1088 struct macsec_eth_header *hdr;
1089 struct macsec_secy *secy = NULL;
1090 struct macsec_rx_sc *rx_sc;
1091 struct macsec_rx_sa *rx_sa;
1092 struct macsec_rxh_data *rxd;
1093 struct macsec_dev *macsec;
1094 unsigned int len;
1095 sci_t sci;
1096 u32 hdr_pn;
1097 bool cbit;
1098 struct pcpu_rx_sc_stats *rxsc_stats;
1099 struct pcpu_secy_stats *secy_stats;
1100 bool pulled_sci;
1101 int ret;
1102
1103 if (skb_headroom(skb) < ETH_HLEN)
1104 goto drop_direct;
1105
1106 hdr = macsec_ethhdr(skb);
1107 if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
1108 return handle_not_macsec(skb);
1109
1110 skb = skb_unshare(skb, GFP_ATOMIC);
1111 *pskb = skb;
1112 if (!skb)
1113 return RX_HANDLER_CONSUMED;
1114
1115 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1116 if (!pulled_sci) {
1117 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1118 goto drop_direct;
1119 }
1120
1121 hdr = macsec_ethhdr(skb);
1122
1123 /* Frames with a SecTAG that has the TCI E bit set but the C
1124 * bit clear are discarded, as this reserved encoding is used
1125 * to identify frames with a SecTAG that are not to be
1126 * delivered to the Controlled Port.
1127 */
1128 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1129 return RX_HANDLER_PASS;
1130
1131 /* now, pull the extra length */
1132 if (hdr->tci_an & MACSEC_TCI_SC) {
1133 if (!pulled_sci)
1134 goto drop_direct;
1135 }
1136
1137 /* ethernet header is part of crypto processing */
1138 skb_push(skb, ETH_HLEN);
1139
1140 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1141 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1142 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1143
1144 rcu_read_lock();
1145 rxd = macsec_data_rcu(skb->dev);
1146
1147 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1148 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1149
1150 sc = sc ? macsec_rxsc_get(sc) : NULL;
1151
1152 if (sc) {
1153 secy = &macsec->secy;
1154 rx_sc = sc;
1155 break;
1156 }
1157 }
1158
1159 if (!secy)
1160 goto nosci;
1161
1162 dev = secy->netdev;
1163 macsec = macsec_priv(dev);
1164 secy_stats = this_cpu_ptr(macsec->stats);
1165 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1166
1167 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
1168 u64_stats_update_begin(&secy_stats->syncp);
1169 secy_stats->stats.InPktsBadTag++;
1170 u64_stats_update_end(&secy_stats->syncp);
1171 DEV_STATS_INC(secy->netdev, rx_errors);
1172 goto drop_nosa;
1173 }
1174
1175 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1176 if (!rx_sa) {
1177 /* 10.6.1 if the SA is not in use */
1178
1179 /* If validateFrames is Strict or the C bit in the
1180 * SecTAG is set, discard
1181 */
1182 struct macsec_rx_sa *active_rx_sa = macsec_active_rxsa_get(rx_sc);
1183 if (hdr->tci_an & MACSEC_TCI_C ||
1184 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1185 u64_stats_update_begin(&rxsc_stats->syncp);
1186 rxsc_stats->stats.InPktsNotUsingSA++;
1187 u64_stats_update_end(&rxsc_stats->syncp);
1188 DEV_STATS_INC(secy->netdev, rx_errors);
1189 if (active_rx_sa)
1190 this_cpu_inc(active_rx_sa->stats->InPktsNotUsingSA);
1191 goto drop_nosa;
1192 }
1193
1194 /* not Strict, the frame (with the SecTAG and ICV
1195 * removed) is delivered to the Controlled Port.
1196 */
1197 u64_stats_update_begin(&rxsc_stats->syncp);
1198 rxsc_stats->stats.InPktsUnusedSA++;
1199 u64_stats_update_end(&rxsc_stats->syncp);
1200 if (active_rx_sa)
1201 this_cpu_inc(active_rx_sa->stats->InPktsUnusedSA);
1202 goto deliver;
1203 }
1204
1205 /* First, PN check to avoid decrypting obviously wrong packets */
1206 hdr_pn = ntohl(hdr->packet_number);
1207 if (secy->replay_protect) {
1208 bool late;
1209
1210 spin_lock(&rx_sa->lock);
1211 late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
1212 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
1213
1214 if (secy->xpn)
1215 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
1216 spin_unlock(&rx_sa->lock);
1217
1218 if (late) {
1219 u64_stats_update_begin(&rxsc_stats->syncp);
1220 rxsc_stats->stats.InPktsLate++;
1221 u64_stats_update_end(&rxsc_stats->syncp);
1222 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1223 goto drop;
1224 }
1225 }
1226
1227 macsec_skb_cb(skb)->rx_sa = rx_sa;
1228
1229 /* Disabled && !changed text => skip validation */
1230 if (hdr->tci_an & MACSEC_TCI_C ||
1231 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1232 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1233
1234 if (IS_ERR(skb)) {
1235 /* the decrypt callback needs the reference */
1236 if (PTR_ERR(skb) != -EINPROGRESS) {
1237 macsec_rxsa_put(rx_sa);
1238 macsec_rxsc_put(rx_sc);
1239 }
1240 rcu_read_unlock();
1241 *pskb = NULL;
1242 return RX_HANDLER_CONSUMED;
1243 }
1244
1245 if (!macsec_post_decrypt(skb, secy, hdr_pn))
1246 goto drop;
1247
1248 deliver:
1249 macsec_finalize_skb(skb, secy->icv_len,
1250 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1251 len = skb->len;
1252 macsec_reset_skb(skb, secy->netdev);
1253
1254 if (rx_sa)
1255 macsec_rxsa_put(rx_sa);
1256 macsec_rxsc_put(rx_sc);
1257
1258 skb_orphan(skb);
1259 ret = gro_cells_receive(&macsec->gro_cells, skb);
1260 if (ret == NET_RX_SUCCESS)
1261 count_rx(dev, len);
1262 else
1263 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1264
1265 rcu_read_unlock();
1266
1267 *pskb = NULL;
1268 return RX_HANDLER_CONSUMED;
1269
1270 drop:
1271 macsec_rxsa_put(rx_sa);
1272 drop_nosa:
1273 macsec_rxsc_put(rx_sc);
1274 rcu_read_unlock();
1275 drop_direct:
1276 kfree_skb(skb);
1277 *pskb = NULL;
1278 return RX_HANDLER_CONSUMED;
1279
1280 nosci:
1281 /* 10.6.1 if the SC is not found */
1282 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1283 if (!cbit)
1284 macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN,
1285 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1286
1287 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1288 struct sk_buff *nskb;
1289
1290 secy_stats = this_cpu_ptr(macsec->stats);
1291
1292 /* If validateFrames is Strict or the C bit in the
1293 * SecTAG is set, discard
1294 */
1295 if (cbit ||
1296 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1297 u64_stats_update_begin(&secy_stats->syncp);
1298 secy_stats->stats.InPktsNoSCI++;
1299 u64_stats_update_end(&secy_stats->syncp);
1300 DEV_STATS_INC(macsec->secy.netdev, rx_errors);
1301 continue;
1302 }
1303
1304 /* not strict, the frame (with the SecTAG and ICV
1305 * removed) is delivered to the Controlled Port.
1306 */
1307 nskb = skb_clone(skb, GFP_ATOMIC);
1308 if (!nskb)
1309 break;
1310
1311 macsec_reset_skb(nskb, macsec->secy.netdev);
1312
1313 ret = __netif_rx(nskb);
1314 if (ret == NET_RX_SUCCESS) {
1315 u64_stats_update_begin(&secy_stats->syncp);
1316 secy_stats->stats.InPktsUnknownSCI++;
1317 u64_stats_update_end(&secy_stats->syncp);
1318 } else {
1319 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1320 }
1321 }
1322
1323 rcu_read_unlock();
1324 *pskb = skb;
1325 return RX_HANDLER_PASS;
1326 }
1327
macsec_alloc_tfm(char * key,int key_len,int icv_len)1328 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1329 {
1330 struct crypto_aead *tfm;
1331 int ret;
1332
1333 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1334
1335 if (IS_ERR(tfm))
1336 return tfm;
1337
1338 ret = crypto_aead_setkey(tfm, key, key_len);
1339 if (ret < 0)
1340 goto fail;
1341
1342 ret = crypto_aead_setauthsize(tfm, icv_len);
1343 if (ret < 0)
1344 goto fail;
1345
1346 return tfm;
1347 fail:
1348 crypto_free_aead(tfm);
1349 return ERR_PTR(ret);
1350 }
1351
init_rx_sa(struct macsec_rx_sa * rx_sa,char * sak,int key_len,int icv_len)1352 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1353 int icv_len)
1354 {
1355 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1356 if (!rx_sa->stats)
1357 return -ENOMEM;
1358
1359 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1360 if (IS_ERR(rx_sa->key.tfm)) {
1361 free_percpu(rx_sa->stats);
1362 return PTR_ERR(rx_sa->key.tfm);
1363 }
1364
1365 rx_sa->ssci = MACSEC_UNDEF_SSCI;
1366 rx_sa->active = false;
1367 rx_sa->next_pn = 1;
1368 refcount_set(&rx_sa->refcnt, 1);
1369 spin_lock_init(&rx_sa->lock);
1370
1371 return 0;
1372 }
1373
clear_rx_sa(struct macsec_rx_sa * rx_sa)1374 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1375 {
1376 rx_sa->active = false;
1377
1378 macsec_rxsa_put(rx_sa);
1379 }
1380
free_rx_sc(struct macsec_rx_sc * rx_sc)1381 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1382 {
1383 int i;
1384
1385 for (i = 0; i < MACSEC_NUM_AN; i++) {
1386 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1387
1388 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1389 if (sa)
1390 clear_rx_sa(sa);
1391 }
1392
1393 macsec_rxsc_put(rx_sc);
1394 }
1395
del_rx_sc(struct macsec_secy * secy,sci_t sci)1396 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1397 {
1398 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1399
1400 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1401 rx_sc;
1402 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1403 if (rx_sc->sci == sci) {
1404 if (rx_sc->active)
1405 secy->n_rx_sc--;
1406 rcu_assign_pointer(*rx_scp, rx_sc->next);
1407 return rx_sc;
1408 }
1409 }
1410
1411 return NULL;
1412 }
1413
create_rx_sc(struct net_device * dev,sci_t sci,bool active)1414 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci,
1415 bool active)
1416 {
1417 struct macsec_rx_sc *rx_sc;
1418 struct macsec_dev *macsec;
1419 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1420 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1421 struct macsec_secy *secy;
1422
1423 list_for_each_entry(macsec, &rxd->secys, secys) {
1424 if (find_rx_sc_rtnl(&macsec->secy, sci))
1425 return ERR_PTR(-EEXIST);
1426 }
1427
1428 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1429 if (!rx_sc)
1430 return ERR_PTR(-ENOMEM);
1431
1432 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1433 if (!rx_sc->stats) {
1434 kfree(rx_sc);
1435 return ERR_PTR(-ENOMEM);
1436 }
1437
1438 rx_sc->sci = sci;
1439 rx_sc->active = active;
1440 refcount_set(&rx_sc->refcnt, 1);
1441
1442 secy = &macsec_priv(dev)->secy;
1443 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1444 rcu_assign_pointer(secy->rx_sc, rx_sc);
1445
1446 if (rx_sc->active)
1447 secy->n_rx_sc++;
1448
1449 return rx_sc;
1450 }
1451
init_tx_sa(struct macsec_tx_sa * tx_sa,char * sak,int key_len,int icv_len)1452 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1453 int icv_len)
1454 {
1455 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1456 if (!tx_sa->stats)
1457 return -ENOMEM;
1458
1459 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1460 if (IS_ERR(tx_sa->key.tfm)) {
1461 free_percpu(tx_sa->stats);
1462 return PTR_ERR(tx_sa->key.tfm);
1463 }
1464
1465 tx_sa->ssci = MACSEC_UNDEF_SSCI;
1466 tx_sa->active = false;
1467 refcount_set(&tx_sa->refcnt, 1);
1468 spin_lock_init(&tx_sa->lock);
1469
1470 return 0;
1471 }
1472
clear_tx_sa(struct macsec_tx_sa * tx_sa)1473 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1474 {
1475 tx_sa->active = false;
1476
1477 macsec_txsa_put(tx_sa);
1478 }
1479
1480 static struct genl_family macsec_fam;
1481
get_dev_from_nl(struct net * net,struct nlattr ** attrs)1482 static struct net_device *get_dev_from_nl(struct net *net,
1483 struct nlattr **attrs)
1484 {
1485 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1486 struct net_device *dev;
1487
1488 dev = __dev_get_by_index(net, ifindex);
1489 if (!dev)
1490 return ERR_PTR(-ENODEV);
1491
1492 if (!netif_is_macsec(dev))
1493 return ERR_PTR(-ENODEV);
1494
1495 return dev;
1496 }
1497
nla_get_offload(const struct nlattr * nla)1498 static enum macsec_offload nla_get_offload(const struct nlattr *nla)
1499 {
1500 return (__force enum macsec_offload)nla_get_u8(nla);
1501 }
1502
nla_get_sci(const struct nlattr * nla)1503 static sci_t nla_get_sci(const struct nlattr *nla)
1504 {
1505 return (__force sci_t)nla_get_u64(nla);
1506 }
1507
nla_put_sci(struct sk_buff * skb,int attrtype,sci_t value,int padattr)1508 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1509 int padattr)
1510 {
1511 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1512 }
1513
nla_get_ssci(const struct nlattr * nla)1514 static ssci_t nla_get_ssci(const struct nlattr *nla)
1515 {
1516 return (__force ssci_t)nla_get_u32(nla);
1517 }
1518
nla_put_ssci(struct sk_buff * skb,int attrtype,ssci_t value)1519 static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
1520 {
1521 return nla_put_u32(skb, attrtype, (__force u64)value);
1522 }
1523
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)1524 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1525 struct nlattr **attrs,
1526 struct nlattr **tb_sa,
1527 struct net_device **devp,
1528 struct macsec_secy **secyp,
1529 struct macsec_tx_sc **scp,
1530 u8 *assoc_num)
1531 {
1532 struct net_device *dev;
1533 struct macsec_secy *secy;
1534 struct macsec_tx_sc *tx_sc;
1535 struct macsec_tx_sa *tx_sa;
1536
1537 if (!tb_sa[MACSEC_SA_ATTR_AN])
1538 return ERR_PTR(-EINVAL);
1539
1540 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1541
1542 dev = get_dev_from_nl(net, attrs);
1543 if (IS_ERR(dev))
1544 return ERR_CAST(dev);
1545
1546 if (*assoc_num >= MACSEC_NUM_AN)
1547 return ERR_PTR(-EINVAL);
1548
1549 secy = &macsec_priv(dev)->secy;
1550 tx_sc = &secy->tx_sc;
1551
1552 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1553 if (!tx_sa)
1554 return ERR_PTR(-ENODEV);
1555
1556 *devp = dev;
1557 *scp = tx_sc;
1558 *secyp = secy;
1559 return tx_sa;
1560 }
1561
get_rxsc_from_nl(struct net * net,struct nlattr ** attrs,struct nlattr ** tb_rxsc,struct net_device ** devp,struct macsec_secy ** secyp)1562 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1563 struct nlattr **attrs,
1564 struct nlattr **tb_rxsc,
1565 struct net_device **devp,
1566 struct macsec_secy **secyp)
1567 {
1568 struct net_device *dev;
1569 struct macsec_secy *secy;
1570 struct macsec_rx_sc *rx_sc;
1571 sci_t sci;
1572
1573 dev = get_dev_from_nl(net, attrs);
1574 if (IS_ERR(dev))
1575 return ERR_CAST(dev);
1576
1577 secy = &macsec_priv(dev)->secy;
1578
1579 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1580 return ERR_PTR(-EINVAL);
1581
1582 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1583 rx_sc = find_rx_sc_rtnl(secy, sci);
1584 if (!rx_sc)
1585 return ERR_PTR(-ENODEV);
1586
1587 *secyp = secy;
1588 *devp = dev;
1589
1590 return rx_sc;
1591 }
1592
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)1593 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1594 struct nlattr **attrs,
1595 struct nlattr **tb_rxsc,
1596 struct nlattr **tb_sa,
1597 struct net_device **devp,
1598 struct macsec_secy **secyp,
1599 struct macsec_rx_sc **scp,
1600 u8 *assoc_num)
1601 {
1602 struct macsec_rx_sc *rx_sc;
1603 struct macsec_rx_sa *rx_sa;
1604
1605 if (!tb_sa[MACSEC_SA_ATTR_AN])
1606 return ERR_PTR(-EINVAL);
1607
1608 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1609 if (*assoc_num >= MACSEC_NUM_AN)
1610 return ERR_PTR(-EINVAL);
1611
1612 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1613 if (IS_ERR(rx_sc))
1614 return ERR_CAST(rx_sc);
1615
1616 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1617 if (!rx_sa)
1618 return ERR_PTR(-ENODEV);
1619
1620 *scp = rx_sc;
1621 return rx_sa;
1622 }
1623
1624 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1625 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1626 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1627 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1628 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1629 };
1630
1631 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1632 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1633 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1634 };
1635
1636 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1637 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1638 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1639 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4),
1640 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1641 .len = MACSEC_KEYID_LEN, },
1642 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1643 .len = MACSEC_MAX_KEY_LEN, },
1644 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
1645 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
1646 .len = MACSEC_SALT_LEN, },
1647 };
1648
1649 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
1650 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
1651 };
1652
1653 /* Offloads an operation to a device driver */
macsec_offload(int (* const func)(struct macsec_context *),struct macsec_context * ctx)1654 static int macsec_offload(int (* const func)(struct macsec_context *),
1655 struct macsec_context *ctx)
1656 {
1657 int ret;
1658
1659 if (unlikely(!func))
1660 return 0;
1661
1662 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1663 mutex_lock(&ctx->phydev->lock);
1664
1665 ret = (*func)(ctx);
1666
1667 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1668 mutex_unlock(&ctx->phydev->lock);
1669
1670 return ret;
1671 }
1672
parse_sa_config(struct nlattr ** attrs,struct nlattr ** tb_sa)1673 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1674 {
1675 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1676 return -EINVAL;
1677
1678 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1679 return -EINVAL;
1680
1681 return 0;
1682 }
1683
parse_rxsc_config(struct nlattr ** attrs,struct nlattr ** tb_rxsc)1684 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1685 {
1686 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1687 return -EINVAL;
1688
1689 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1690 return -EINVAL;
1691
1692 return 0;
1693 }
1694
validate_add_rxsa(struct nlattr ** attrs)1695 static bool validate_add_rxsa(struct nlattr **attrs)
1696 {
1697 if (!attrs[MACSEC_SA_ATTR_AN] ||
1698 !attrs[MACSEC_SA_ATTR_KEY] ||
1699 !attrs[MACSEC_SA_ATTR_KEYID])
1700 return false;
1701
1702 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1703 return false;
1704
1705 if (attrs[MACSEC_SA_ATTR_PN] &&
1706 nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1707 return false;
1708
1709 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1710 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1711 return false;
1712 }
1713
1714 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1715 return false;
1716
1717 return true;
1718 }
1719
macsec_add_rxsa(struct sk_buff * skb,struct genl_info * info)1720 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1721 {
1722 struct net_device *dev;
1723 struct nlattr **attrs = info->attrs;
1724 struct macsec_secy *secy;
1725 struct macsec_rx_sc *rx_sc;
1726 struct macsec_rx_sa *rx_sa;
1727 unsigned char assoc_num;
1728 int pn_len;
1729 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1730 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1731 int err;
1732
1733 if (!attrs[MACSEC_ATTR_IFINDEX])
1734 return -EINVAL;
1735
1736 if (parse_sa_config(attrs, tb_sa))
1737 return -EINVAL;
1738
1739 if (parse_rxsc_config(attrs, tb_rxsc))
1740 return -EINVAL;
1741
1742 if (!validate_add_rxsa(tb_sa))
1743 return -EINVAL;
1744
1745 rtnl_lock();
1746 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1747 if (IS_ERR(rx_sc)) {
1748 rtnl_unlock();
1749 return PTR_ERR(rx_sc);
1750 }
1751
1752 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1753
1754 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1755 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1756 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1757 rtnl_unlock();
1758 return -EINVAL;
1759 }
1760
1761 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1762 if (tb_sa[MACSEC_SA_ATTR_PN] &&
1763 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1764 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
1765 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1766 rtnl_unlock();
1767 return -EINVAL;
1768 }
1769
1770 if (secy->xpn) {
1771 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
1772 rtnl_unlock();
1773 return -EINVAL;
1774 }
1775
1776 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
1777 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
1778 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
1779 MACSEC_SALT_LEN);
1780 rtnl_unlock();
1781 return -EINVAL;
1782 }
1783 }
1784
1785 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1786 if (rx_sa) {
1787 rtnl_unlock();
1788 return -EBUSY;
1789 }
1790
1791 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1792 if (!rx_sa) {
1793 rtnl_unlock();
1794 return -ENOMEM;
1795 }
1796
1797 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1798 secy->key_len, secy->icv_len);
1799 if (err < 0) {
1800 kfree(rx_sa);
1801 rtnl_unlock();
1802 return err;
1803 }
1804
1805 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1806 spin_lock_bh(&rx_sa->lock);
1807 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
1808 spin_unlock_bh(&rx_sa->lock);
1809 }
1810
1811 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1812 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1813
1814 rx_sa->sc = rx_sc;
1815
1816 if (secy->xpn) {
1817 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
1818 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
1819 MACSEC_SALT_LEN);
1820 }
1821
1822 /* If h/w offloading is available, propagate to the device */
1823 if (macsec_is_offloaded(netdev_priv(dev))) {
1824 const struct macsec_ops *ops;
1825 struct macsec_context ctx;
1826
1827 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1828 if (!ops) {
1829 err = -EOPNOTSUPP;
1830 goto cleanup;
1831 }
1832
1833 ctx.sa.assoc_num = assoc_num;
1834 ctx.sa.rx_sa = rx_sa;
1835 ctx.secy = secy;
1836 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1837 secy->key_len);
1838
1839 err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1840 memzero_explicit(ctx.sa.key, secy->key_len);
1841 if (err)
1842 goto cleanup;
1843 }
1844
1845 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1846 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1847
1848 rtnl_unlock();
1849
1850 return 0;
1851
1852 cleanup:
1853 macsec_rxsa_put(rx_sa);
1854 rtnl_unlock();
1855 return err;
1856 }
1857
validate_add_rxsc(struct nlattr ** attrs)1858 static bool validate_add_rxsc(struct nlattr **attrs)
1859 {
1860 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1861 return false;
1862
1863 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1864 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1865 return false;
1866 }
1867
1868 return true;
1869 }
1870
macsec_add_rxsc(struct sk_buff * skb,struct genl_info * info)1871 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1872 {
1873 struct net_device *dev;
1874 sci_t sci = MACSEC_UNDEF_SCI;
1875 struct nlattr **attrs = info->attrs;
1876 struct macsec_rx_sc *rx_sc;
1877 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1878 struct macsec_secy *secy;
1879 bool active = true;
1880 int ret;
1881
1882 if (!attrs[MACSEC_ATTR_IFINDEX])
1883 return -EINVAL;
1884
1885 if (parse_rxsc_config(attrs, tb_rxsc))
1886 return -EINVAL;
1887
1888 if (!validate_add_rxsc(tb_rxsc))
1889 return -EINVAL;
1890
1891 rtnl_lock();
1892 dev = get_dev_from_nl(genl_info_net(info), attrs);
1893 if (IS_ERR(dev)) {
1894 rtnl_unlock();
1895 return PTR_ERR(dev);
1896 }
1897
1898 secy = &macsec_priv(dev)->secy;
1899 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1900
1901 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1902 active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1903
1904 rx_sc = create_rx_sc(dev, sci, active);
1905 if (IS_ERR(rx_sc)) {
1906 rtnl_unlock();
1907 return PTR_ERR(rx_sc);
1908 }
1909
1910 if (macsec_is_offloaded(netdev_priv(dev))) {
1911 const struct macsec_ops *ops;
1912 struct macsec_context ctx;
1913
1914 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1915 if (!ops) {
1916 ret = -EOPNOTSUPP;
1917 goto cleanup;
1918 }
1919
1920 ctx.rx_sc = rx_sc;
1921 ctx.secy = secy;
1922
1923 ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1924 if (ret)
1925 goto cleanup;
1926 }
1927
1928 rtnl_unlock();
1929
1930 return 0;
1931
1932 cleanup:
1933 del_rx_sc(secy, sci);
1934 free_rx_sc(rx_sc);
1935 rtnl_unlock();
1936 return ret;
1937 }
1938
validate_add_txsa(struct nlattr ** attrs)1939 static bool validate_add_txsa(struct nlattr **attrs)
1940 {
1941 if (!attrs[MACSEC_SA_ATTR_AN] ||
1942 !attrs[MACSEC_SA_ATTR_PN] ||
1943 !attrs[MACSEC_SA_ATTR_KEY] ||
1944 !attrs[MACSEC_SA_ATTR_KEYID])
1945 return false;
1946
1947 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1948 return false;
1949
1950 if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1951 return false;
1952
1953 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1954 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1955 return false;
1956 }
1957
1958 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1959 return false;
1960
1961 return true;
1962 }
1963
macsec_add_txsa(struct sk_buff * skb,struct genl_info * info)1964 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1965 {
1966 struct net_device *dev;
1967 struct nlattr **attrs = info->attrs;
1968 struct macsec_secy *secy;
1969 struct macsec_tx_sc *tx_sc;
1970 struct macsec_tx_sa *tx_sa;
1971 unsigned char assoc_num;
1972 int pn_len;
1973 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1974 bool was_operational;
1975 int err;
1976
1977 if (!attrs[MACSEC_ATTR_IFINDEX])
1978 return -EINVAL;
1979
1980 if (parse_sa_config(attrs, tb_sa))
1981 return -EINVAL;
1982
1983 if (!validate_add_txsa(tb_sa))
1984 return -EINVAL;
1985
1986 rtnl_lock();
1987 dev = get_dev_from_nl(genl_info_net(info), attrs);
1988 if (IS_ERR(dev)) {
1989 rtnl_unlock();
1990 return PTR_ERR(dev);
1991 }
1992
1993 secy = &macsec_priv(dev)->secy;
1994 tx_sc = &secy->tx_sc;
1995
1996 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1997
1998 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1999 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
2000 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
2001 rtnl_unlock();
2002 return -EINVAL;
2003 }
2004
2005 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2006 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2007 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
2008 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2009 rtnl_unlock();
2010 return -EINVAL;
2011 }
2012
2013 if (secy->xpn) {
2014 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
2015 rtnl_unlock();
2016 return -EINVAL;
2017 }
2018
2019 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
2020 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
2021 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
2022 MACSEC_SALT_LEN);
2023 rtnl_unlock();
2024 return -EINVAL;
2025 }
2026 }
2027
2028 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
2029 if (tx_sa) {
2030 rtnl_unlock();
2031 return -EBUSY;
2032 }
2033
2034 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
2035 if (!tx_sa) {
2036 rtnl_unlock();
2037 return -ENOMEM;
2038 }
2039
2040 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2041 secy->key_len, secy->icv_len);
2042 if (err < 0) {
2043 kfree(tx_sa);
2044 rtnl_unlock();
2045 return err;
2046 }
2047
2048 spin_lock_bh(&tx_sa->lock);
2049 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2050 spin_unlock_bh(&tx_sa->lock);
2051
2052 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2053 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2054
2055 was_operational = secy->operational;
2056 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
2057 secy->operational = true;
2058
2059 if (secy->xpn) {
2060 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
2061 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
2062 MACSEC_SALT_LEN);
2063 }
2064
2065 /* If h/w offloading is available, propagate to the device */
2066 if (macsec_is_offloaded(netdev_priv(dev))) {
2067 const struct macsec_ops *ops;
2068 struct macsec_context ctx;
2069
2070 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2071 if (!ops) {
2072 err = -EOPNOTSUPP;
2073 goto cleanup;
2074 }
2075
2076 ctx.sa.assoc_num = assoc_num;
2077 ctx.sa.tx_sa = tx_sa;
2078 ctx.secy = secy;
2079 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2080 secy->key_len);
2081
2082 err = macsec_offload(ops->mdo_add_txsa, &ctx);
2083 memzero_explicit(ctx.sa.key, secy->key_len);
2084 if (err)
2085 goto cleanup;
2086 }
2087
2088 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
2089 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
2090
2091 rtnl_unlock();
2092
2093 return 0;
2094
2095 cleanup:
2096 secy->operational = was_operational;
2097 macsec_txsa_put(tx_sa);
2098 rtnl_unlock();
2099 return err;
2100 }
2101
macsec_del_rxsa(struct sk_buff * skb,struct genl_info * info)2102 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
2103 {
2104 struct nlattr **attrs = info->attrs;
2105 struct net_device *dev;
2106 struct macsec_secy *secy;
2107 struct macsec_rx_sc *rx_sc;
2108 struct macsec_rx_sa *rx_sa;
2109 u8 assoc_num;
2110 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2111 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2112 int ret;
2113
2114 if (!attrs[MACSEC_ATTR_IFINDEX])
2115 return -EINVAL;
2116
2117 if (parse_sa_config(attrs, tb_sa))
2118 return -EINVAL;
2119
2120 if (parse_rxsc_config(attrs, tb_rxsc))
2121 return -EINVAL;
2122
2123 rtnl_lock();
2124 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2125 &dev, &secy, &rx_sc, &assoc_num);
2126 if (IS_ERR(rx_sa)) {
2127 rtnl_unlock();
2128 return PTR_ERR(rx_sa);
2129 }
2130
2131 if (rx_sa->active) {
2132 rtnl_unlock();
2133 return -EBUSY;
2134 }
2135
2136 /* If h/w offloading is available, propagate to the device */
2137 if (macsec_is_offloaded(netdev_priv(dev))) {
2138 const struct macsec_ops *ops;
2139 struct macsec_context ctx;
2140
2141 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2142 if (!ops) {
2143 ret = -EOPNOTSUPP;
2144 goto cleanup;
2145 }
2146
2147 ctx.sa.assoc_num = assoc_num;
2148 ctx.sa.rx_sa = rx_sa;
2149 ctx.secy = secy;
2150
2151 ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
2152 if (ret)
2153 goto cleanup;
2154 }
2155
2156 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
2157 clear_rx_sa(rx_sa);
2158
2159 rtnl_unlock();
2160
2161 return 0;
2162
2163 cleanup:
2164 rtnl_unlock();
2165 return ret;
2166 }
2167
macsec_del_rxsc(struct sk_buff * skb,struct genl_info * info)2168 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
2169 {
2170 struct nlattr **attrs = info->attrs;
2171 struct net_device *dev;
2172 struct macsec_secy *secy;
2173 struct macsec_rx_sc *rx_sc;
2174 sci_t sci;
2175 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2176 int ret;
2177
2178 if (!attrs[MACSEC_ATTR_IFINDEX])
2179 return -EINVAL;
2180
2181 if (parse_rxsc_config(attrs, tb_rxsc))
2182 return -EINVAL;
2183
2184 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
2185 return -EINVAL;
2186
2187 rtnl_lock();
2188 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2189 if (IS_ERR(dev)) {
2190 rtnl_unlock();
2191 return PTR_ERR(dev);
2192 }
2193
2194 secy = &macsec_priv(dev)->secy;
2195 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2196
2197 rx_sc = del_rx_sc(secy, sci);
2198 if (!rx_sc) {
2199 rtnl_unlock();
2200 return -ENODEV;
2201 }
2202
2203 /* If h/w offloading is available, propagate to the device */
2204 if (macsec_is_offloaded(netdev_priv(dev))) {
2205 const struct macsec_ops *ops;
2206 struct macsec_context ctx;
2207
2208 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2209 if (!ops) {
2210 ret = -EOPNOTSUPP;
2211 goto cleanup;
2212 }
2213
2214 ctx.rx_sc = rx_sc;
2215 ctx.secy = secy;
2216 ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2217 if (ret)
2218 goto cleanup;
2219 }
2220
2221 free_rx_sc(rx_sc);
2222 rtnl_unlock();
2223
2224 return 0;
2225
2226 cleanup:
2227 rtnl_unlock();
2228 return ret;
2229 }
2230
macsec_del_txsa(struct sk_buff * skb,struct genl_info * info)2231 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2232 {
2233 struct nlattr **attrs = info->attrs;
2234 struct net_device *dev;
2235 struct macsec_secy *secy;
2236 struct macsec_tx_sc *tx_sc;
2237 struct macsec_tx_sa *tx_sa;
2238 u8 assoc_num;
2239 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2240 int ret;
2241
2242 if (!attrs[MACSEC_ATTR_IFINDEX])
2243 return -EINVAL;
2244
2245 if (parse_sa_config(attrs, tb_sa))
2246 return -EINVAL;
2247
2248 rtnl_lock();
2249 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2250 &dev, &secy, &tx_sc, &assoc_num);
2251 if (IS_ERR(tx_sa)) {
2252 rtnl_unlock();
2253 return PTR_ERR(tx_sa);
2254 }
2255
2256 if (tx_sa->active) {
2257 rtnl_unlock();
2258 return -EBUSY;
2259 }
2260
2261 /* If h/w offloading is available, propagate to the device */
2262 if (macsec_is_offloaded(netdev_priv(dev))) {
2263 const struct macsec_ops *ops;
2264 struct macsec_context ctx;
2265
2266 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2267 if (!ops) {
2268 ret = -EOPNOTSUPP;
2269 goto cleanup;
2270 }
2271
2272 ctx.sa.assoc_num = assoc_num;
2273 ctx.sa.tx_sa = tx_sa;
2274 ctx.secy = secy;
2275
2276 ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2277 if (ret)
2278 goto cleanup;
2279 }
2280
2281 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2282 clear_tx_sa(tx_sa);
2283
2284 rtnl_unlock();
2285
2286 return 0;
2287
2288 cleanup:
2289 rtnl_unlock();
2290 return ret;
2291 }
2292
validate_upd_sa(struct nlattr ** attrs)2293 static bool validate_upd_sa(struct nlattr **attrs)
2294 {
2295 if (!attrs[MACSEC_SA_ATTR_AN] ||
2296 attrs[MACSEC_SA_ATTR_KEY] ||
2297 attrs[MACSEC_SA_ATTR_KEYID] ||
2298 attrs[MACSEC_SA_ATTR_SSCI] ||
2299 attrs[MACSEC_SA_ATTR_SALT])
2300 return false;
2301
2302 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2303 return false;
2304
2305 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
2306 return false;
2307
2308 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2309 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2310 return false;
2311 }
2312
2313 return true;
2314 }
2315
macsec_upd_txsa(struct sk_buff * skb,struct genl_info * info)2316 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2317 {
2318 struct nlattr **attrs = info->attrs;
2319 struct net_device *dev;
2320 struct macsec_secy *secy;
2321 struct macsec_tx_sc *tx_sc;
2322 struct macsec_tx_sa *tx_sa;
2323 u8 assoc_num;
2324 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2325 bool was_operational, was_active;
2326 pn_t prev_pn;
2327 int ret = 0;
2328
2329 prev_pn.full64 = 0;
2330
2331 if (!attrs[MACSEC_ATTR_IFINDEX])
2332 return -EINVAL;
2333
2334 if (parse_sa_config(attrs, tb_sa))
2335 return -EINVAL;
2336
2337 if (!validate_upd_sa(tb_sa))
2338 return -EINVAL;
2339
2340 rtnl_lock();
2341 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2342 &dev, &secy, &tx_sc, &assoc_num);
2343 if (IS_ERR(tx_sa)) {
2344 rtnl_unlock();
2345 return PTR_ERR(tx_sa);
2346 }
2347
2348 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2349 int pn_len;
2350
2351 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2352 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2353 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
2354 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2355 rtnl_unlock();
2356 return -EINVAL;
2357 }
2358
2359 spin_lock_bh(&tx_sa->lock);
2360 prev_pn = tx_sa->next_pn_halves;
2361 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2362 spin_unlock_bh(&tx_sa->lock);
2363 }
2364
2365 was_active = tx_sa->active;
2366 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2367 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2368
2369 was_operational = secy->operational;
2370 if (assoc_num == tx_sc->encoding_sa)
2371 secy->operational = tx_sa->active;
2372
2373 /* If h/w offloading is available, propagate to the device */
2374 if (macsec_is_offloaded(netdev_priv(dev))) {
2375 const struct macsec_ops *ops;
2376 struct macsec_context ctx;
2377
2378 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2379 if (!ops) {
2380 ret = -EOPNOTSUPP;
2381 goto cleanup;
2382 }
2383
2384 ctx.sa.assoc_num = assoc_num;
2385 ctx.sa.tx_sa = tx_sa;
2386 ctx.sa.update_pn = !!prev_pn.full64;
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.sa.update_pn = !!prev_pn.full64;
2481 ctx.secy = secy;
2482
2483 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2484 if (ret)
2485 goto cleanup;
2486 }
2487
2488 rtnl_unlock();
2489 return 0;
2490
2491 cleanup:
2492 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2493 spin_lock_bh(&rx_sa->lock);
2494 rx_sa->next_pn_halves = prev_pn;
2495 spin_unlock_bh(&rx_sa->lock);
2496 }
2497 rx_sa->active = was_active;
2498 rtnl_unlock();
2499 return ret;
2500 }
2501
macsec_upd_rxsc(struct sk_buff * skb,struct genl_info * info)2502 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2503 {
2504 struct nlattr **attrs = info->attrs;
2505 struct net_device *dev;
2506 struct macsec_secy *secy;
2507 struct macsec_rx_sc *rx_sc;
2508 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2509 unsigned int prev_n_rx_sc;
2510 bool was_active;
2511 int ret;
2512
2513 if (!attrs[MACSEC_ATTR_IFINDEX])
2514 return -EINVAL;
2515
2516 if (parse_rxsc_config(attrs, tb_rxsc))
2517 return -EINVAL;
2518
2519 if (!validate_add_rxsc(tb_rxsc))
2520 return -EINVAL;
2521
2522 rtnl_lock();
2523 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2524 if (IS_ERR(rx_sc)) {
2525 rtnl_unlock();
2526 return PTR_ERR(rx_sc);
2527 }
2528
2529 was_active = rx_sc->active;
2530 prev_n_rx_sc = secy->n_rx_sc;
2531 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2532 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2533
2534 if (rx_sc->active != new)
2535 secy->n_rx_sc += new ? 1 : -1;
2536
2537 rx_sc->active = new;
2538 }
2539
2540 /* If h/w offloading is available, propagate to the device */
2541 if (macsec_is_offloaded(netdev_priv(dev))) {
2542 const struct macsec_ops *ops;
2543 struct macsec_context ctx;
2544
2545 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2546 if (!ops) {
2547 ret = -EOPNOTSUPP;
2548 goto cleanup;
2549 }
2550
2551 ctx.rx_sc = rx_sc;
2552 ctx.secy = secy;
2553
2554 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2555 if (ret)
2556 goto cleanup;
2557 }
2558
2559 rtnl_unlock();
2560
2561 return 0;
2562
2563 cleanup:
2564 secy->n_rx_sc = prev_n_rx_sc;
2565 rx_sc->active = was_active;
2566 rtnl_unlock();
2567 return ret;
2568 }
2569
macsec_is_configured(struct macsec_dev * macsec)2570 static bool macsec_is_configured(struct macsec_dev *macsec)
2571 {
2572 struct macsec_secy *secy = &macsec->secy;
2573 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2574 int i;
2575
2576 if (secy->rx_sc)
2577 return true;
2578
2579 for (i = 0; i < MACSEC_NUM_AN; i++)
2580 if (tx_sc->sa[i])
2581 return true;
2582
2583 return false;
2584 }
2585
macsec_update_offload(struct net_device * dev,enum macsec_offload offload)2586 static int macsec_update_offload(struct net_device *dev, enum macsec_offload offload)
2587 {
2588 enum macsec_offload prev_offload;
2589 const struct macsec_ops *ops;
2590 struct macsec_context ctx;
2591 struct macsec_dev *macsec;
2592 int ret = 0;
2593
2594 macsec = macsec_priv(dev);
2595
2596 /* Check if the offloading mode is supported by the underlying layers */
2597 if (offload != MACSEC_OFFLOAD_OFF &&
2598 !macsec_check_offload(offload, macsec))
2599 return -EOPNOTSUPP;
2600
2601 /* Check if the net device is busy. */
2602 if (netif_running(dev))
2603 return -EBUSY;
2604
2605 /* Check if the device already has rules configured: we do not support
2606 * rules migration.
2607 */
2608 if (macsec_is_configured(macsec))
2609 return -EBUSY;
2610
2611 prev_offload = macsec->offload;
2612
2613 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2614 macsec, &ctx);
2615 if (!ops)
2616 return -EOPNOTSUPP;
2617
2618 macsec->offload = offload;
2619
2620 ctx.secy = &macsec->secy;
2621 ret = offload == MACSEC_OFFLOAD_OFF ? macsec_offload(ops->mdo_del_secy, &ctx)
2622 : macsec_offload(ops->mdo_add_secy, &ctx);
2623 if (ret)
2624 macsec->offload = prev_offload;
2625
2626 return ret;
2627 }
2628
macsec_upd_offload(struct sk_buff * skb,struct genl_info * info)2629 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2630 {
2631 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2632 struct nlattr **attrs = info->attrs;
2633 enum macsec_offload offload;
2634 struct macsec_dev *macsec;
2635 struct net_device *dev;
2636 int ret = 0;
2637
2638 if (!attrs[MACSEC_ATTR_IFINDEX])
2639 return -EINVAL;
2640
2641 if (!attrs[MACSEC_ATTR_OFFLOAD])
2642 return -EINVAL;
2643
2644 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2645 attrs[MACSEC_ATTR_OFFLOAD],
2646 macsec_genl_offload_policy, NULL))
2647 return -EINVAL;
2648
2649 rtnl_lock();
2650
2651 dev = get_dev_from_nl(genl_info_net(info), attrs);
2652 if (IS_ERR(dev)) {
2653 ret = PTR_ERR(dev);
2654 goto out;
2655 }
2656 macsec = macsec_priv(dev);
2657
2658 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) {
2659 ret = -EINVAL;
2660 goto out;
2661 }
2662
2663 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2664
2665 if (macsec->offload != offload)
2666 ret = macsec_update_offload(dev, offload);
2667 out:
2668 rtnl_unlock();
2669 return ret;
2670 }
2671
get_tx_sa_stats(struct net_device * dev,int an,struct macsec_tx_sa * tx_sa,struct macsec_tx_sa_stats * sum)2672 static void get_tx_sa_stats(struct net_device *dev, int an,
2673 struct macsec_tx_sa *tx_sa,
2674 struct macsec_tx_sa_stats *sum)
2675 {
2676 struct macsec_dev *macsec = macsec_priv(dev);
2677 int cpu;
2678
2679 /* If h/w offloading is available, propagate to the device */
2680 if (macsec_is_offloaded(macsec)) {
2681 const struct macsec_ops *ops;
2682 struct macsec_context ctx;
2683
2684 ops = macsec_get_ops(macsec, &ctx);
2685 if (ops) {
2686 ctx.sa.assoc_num = an;
2687 ctx.sa.tx_sa = tx_sa;
2688 ctx.stats.tx_sa_stats = sum;
2689 ctx.secy = &macsec_priv(dev)->secy;
2690 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
2691 }
2692 return;
2693 }
2694
2695 for_each_possible_cpu(cpu) {
2696 const struct macsec_tx_sa_stats *stats =
2697 per_cpu_ptr(tx_sa->stats, cpu);
2698
2699 sum->OutPktsProtected += stats->OutPktsProtected;
2700 sum->OutPktsEncrypted += stats->OutPktsEncrypted;
2701 }
2702 }
2703
copy_tx_sa_stats(struct sk_buff * skb,struct macsec_tx_sa_stats * sum)2704 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
2705 {
2706 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
2707 sum->OutPktsProtected) ||
2708 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2709 sum->OutPktsEncrypted))
2710 return -EMSGSIZE;
2711
2712 return 0;
2713 }
2714
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)2715 static void get_rx_sa_stats(struct net_device *dev,
2716 struct macsec_rx_sc *rx_sc, int an,
2717 struct macsec_rx_sa *rx_sa,
2718 struct macsec_rx_sa_stats *sum)
2719 {
2720 struct macsec_dev *macsec = macsec_priv(dev);
2721 int cpu;
2722
2723 /* If h/w offloading is available, propagate to the device */
2724 if (macsec_is_offloaded(macsec)) {
2725 const struct macsec_ops *ops;
2726 struct macsec_context ctx;
2727
2728 ops = macsec_get_ops(macsec, &ctx);
2729 if (ops) {
2730 ctx.sa.assoc_num = an;
2731 ctx.sa.rx_sa = rx_sa;
2732 ctx.stats.rx_sa_stats = sum;
2733 ctx.secy = &macsec_priv(dev)->secy;
2734 ctx.rx_sc = rx_sc;
2735 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
2736 }
2737 return;
2738 }
2739
2740 for_each_possible_cpu(cpu) {
2741 const struct macsec_rx_sa_stats *stats =
2742 per_cpu_ptr(rx_sa->stats, cpu);
2743
2744 sum->InPktsOK += stats->InPktsOK;
2745 sum->InPktsInvalid += stats->InPktsInvalid;
2746 sum->InPktsNotValid += stats->InPktsNotValid;
2747 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
2748 sum->InPktsUnusedSA += stats->InPktsUnusedSA;
2749 }
2750 }
2751
copy_rx_sa_stats(struct sk_buff * skb,struct macsec_rx_sa_stats * sum)2752 static int copy_rx_sa_stats(struct sk_buff *skb,
2753 struct macsec_rx_sa_stats *sum)
2754 {
2755 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
2756 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
2757 sum->InPktsInvalid) ||
2758 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
2759 sum->InPktsNotValid) ||
2760 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2761 sum->InPktsNotUsingSA) ||
2762 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
2763 sum->InPktsUnusedSA))
2764 return -EMSGSIZE;
2765
2766 return 0;
2767 }
2768
get_rx_sc_stats(struct net_device * dev,struct macsec_rx_sc * rx_sc,struct macsec_rx_sc_stats * sum)2769 static void get_rx_sc_stats(struct net_device *dev,
2770 struct macsec_rx_sc *rx_sc,
2771 struct macsec_rx_sc_stats *sum)
2772 {
2773 struct macsec_dev *macsec = macsec_priv(dev);
2774 int cpu;
2775
2776 /* If h/w offloading is available, propagate to the device */
2777 if (macsec_is_offloaded(macsec)) {
2778 const struct macsec_ops *ops;
2779 struct macsec_context ctx;
2780
2781 ops = macsec_get_ops(macsec, &ctx);
2782 if (ops) {
2783 ctx.stats.rx_sc_stats = sum;
2784 ctx.secy = &macsec_priv(dev)->secy;
2785 ctx.rx_sc = rx_sc;
2786 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
2787 }
2788 return;
2789 }
2790
2791 for_each_possible_cpu(cpu) {
2792 const struct pcpu_rx_sc_stats *stats;
2793 struct macsec_rx_sc_stats tmp;
2794 unsigned int start;
2795
2796 stats = per_cpu_ptr(rx_sc->stats, cpu);
2797 do {
2798 start = u64_stats_fetch_begin(&stats->syncp);
2799 memcpy(&tmp, &stats->stats, sizeof(tmp));
2800 } while (u64_stats_fetch_retry(&stats->syncp, start));
2801
2802 sum->InOctetsValidated += tmp.InOctetsValidated;
2803 sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
2804 sum->InPktsUnchecked += tmp.InPktsUnchecked;
2805 sum->InPktsDelayed += tmp.InPktsDelayed;
2806 sum->InPktsOK += tmp.InPktsOK;
2807 sum->InPktsInvalid += tmp.InPktsInvalid;
2808 sum->InPktsLate += tmp.InPktsLate;
2809 sum->InPktsNotValid += tmp.InPktsNotValid;
2810 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2811 sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
2812 }
2813 }
2814
copy_rx_sc_stats(struct sk_buff * skb,struct macsec_rx_sc_stats * sum)2815 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
2816 {
2817 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2818 sum->InOctetsValidated,
2819 MACSEC_RXSC_STATS_ATTR_PAD) ||
2820 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2821 sum->InOctetsDecrypted,
2822 MACSEC_RXSC_STATS_ATTR_PAD) ||
2823 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2824 sum->InPktsUnchecked,
2825 MACSEC_RXSC_STATS_ATTR_PAD) ||
2826 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2827 sum->InPktsDelayed,
2828 MACSEC_RXSC_STATS_ATTR_PAD) ||
2829 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2830 sum->InPktsOK,
2831 MACSEC_RXSC_STATS_ATTR_PAD) ||
2832 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2833 sum->InPktsInvalid,
2834 MACSEC_RXSC_STATS_ATTR_PAD) ||
2835 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2836 sum->InPktsLate,
2837 MACSEC_RXSC_STATS_ATTR_PAD) ||
2838 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2839 sum->InPktsNotValid,
2840 MACSEC_RXSC_STATS_ATTR_PAD) ||
2841 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2842 sum->InPktsNotUsingSA,
2843 MACSEC_RXSC_STATS_ATTR_PAD) ||
2844 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2845 sum->InPktsUnusedSA,
2846 MACSEC_RXSC_STATS_ATTR_PAD))
2847 return -EMSGSIZE;
2848
2849 return 0;
2850 }
2851
get_tx_sc_stats(struct net_device * dev,struct macsec_tx_sc_stats * sum)2852 static void get_tx_sc_stats(struct net_device *dev,
2853 struct macsec_tx_sc_stats *sum)
2854 {
2855 struct macsec_dev *macsec = macsec_priv(dev);
2856 int cpu;
2857
2858 /* If h/w offloading is available, propagate to the device */
2859 if (macsec_is_offloaded(macsec)) {
2860 const struct macsec_ops *ops;
2861 struct macsec_context ctx;
2862
2863 ops = macsec_get_ops(macsec, &ctx);
2864 if (ops) {
2865 ctx.stats.tx_sc_stats = sum;
2866 ctx.secy = &macsec_priv(dev)->secy;
2867 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
2868 }
2869 return;
2870 }
2871
2872 for_each_possible_cpu(cpu) {
2873 const struct pcpu_tx_sc_stats *stats;
2874 struct macsec_tx_sc_stats tmp;
2875 unsigned int start;
2876
2877 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
2878 do {
2879 start = u64_stats_fetch_begin(&stats->syncp);
2880 memcpy(&tmp, &stats->stats, sizeof(tmp));
2881 } while (u64_stats_fetch_retry(&stats->syncp, start));
2882
2883 sum->OutPktsProtected += tmp.OutPktsProtected;
2884 sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
2885 sum->OutOctetsProtected += tmp.OutOctetsProtected;
2886 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2887 }
2888 }
2889
copy_tx_sc_stats(struct sk_buff * skb,struct macsec_tx_sc_stats * sum)2890 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
2891 {
2892 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2893 sum->OutPktsProtected,
2894 MACSEC_TXSC_STATS_ATTR_PAD) ||
2895 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2896 sum->OutPktsEncrypted,
2897 MACSEC_TXSC_STATS_ATTR_PAD) ||
2898 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2899 sum->OutOctetsProtected,
2900 MACSEC_TXSC_STATS_ATTR_PAD) ||
2901 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2902 sum->OutOctetsEncrypted,
2903 MACSEC_TXSC_STATS_ATTR_PAD))
2904 return -EMSGSIZE;
2905
2906 return 0;
2907 }
2908
get_secy_stats(struct net_device * dev,struct macsec_dev_stats * sum)2909 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
2910 {
2911 struct macsec_dev *macsec = macsec_priv(dev);
2912 int cpu;
2913
2914 /* If h/w offloading is available, propagate to the device */
2915 if (macsec_is_offloaded(macsec)) {
2916 const struct macsec_ops *ops;
2917 struct macsec_context ctx;
2918
2919 ops = macsec_get_ops(macsec, &ctx);
2920 if (ops) {
2921 ctx.stats.dev_stats = sum;
2922 ctx.secy = &macsec_priv(dev)->secy;
2923 macsec_offload(ops->mdo_get_dev_stats, &ctx);
2924 }
2925 return;
2926 }
2927
2928 for_each_possible_cpu(cpu) {
2929 const struct pcpu_secy_stats *stats;
2930 struct macsec_dev_stats tmp;
2931 unsigned int start;
2932
2933 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
2934 do {
2935 start = u64_stats_fetch_begin(&stats->syncp);
2936 memcpy(&tmp, &stats->stats, sizeof(tmp));
2937 } while (u64_stats_fetch_retry(&stats->syncp, start));
2938
2939 sum->OutPktsUntagged += tmp.OutPktsUntagged;
2940 sum->InPktsUntagged += tmp.InPktsUntagged;
2941 sum->OutPktsTooLong += tmp.OutPktsTooLong;
2942 sum->InPktsNoTag += tmp.InPktsNoTag;
2943 sum->InPktsBadTag += tmp.InPktsBadTag;
2944 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2945 sum->InPktsNoSCI += tmp.InPktsNoSCI;
2946 sum->InPktsOverrun += tmp.InPktsOverrun;
2947 }
2948 }
2949
copy_secy_stats(struct sk_buff * skb,struct macsec_dev_stats * sum)2950 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
2951 {
2952 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2953 sum->OutPktsUntagged,
2954 MACSEC_SECY_STATS_ATTR_PAD) ||
2955 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2956 sum->InPktsUntagged,
2957 MACSEC_SECY_STATS_ATTR_PAD) ||
2958 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2959 sum->OutPktsTooLong,
2960 MACSEC_SECY_STATS_ATTR_PAD) ||
2961 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2962 sum->InPktsNoTag,
2963 MACSEC_SECY_STATS_ATTR_PAD) ||
2964 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2965 sum->InPktsBadTag,
2966 MACSEC_SECY_STATS_ATTR_PAD) ||
2967 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2968 sum->InPktsUnknownSCI,
2969 MACSEC_SECY_STATS_ATTR_PAD) ||
2970 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2971 sum->InPktsNoSCI,
2972 MACSEC_SECY_STATS_ATTR_PAD) ||
2973 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2974 sum->InPktsOverrun,
2975 MACSEC_SECY_STATS_ATTR_PAD))
2976 return -EMSGSIZE;
2977
2978 return 0;
2979 }
2980
nla_put_secy(struct macsec_secy * secy,struct sk_buff * skb)2981 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2982 {
2983 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2984 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
2985 MACSEC_ATTR_SECY);
2986 u64 csid;
2987
2988 if (!secy_nest)
2989 return 1;
2990
2991 switch (secy->key_len) {
2992 case MACSEC_GCM_AES_128_SAK_LEN:
2993 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
2994 break;
2995 case MACSEC_GCM_AES_256_SAK_LEN:
2996 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
2997 break;
2998 default:
2999 goto cancel;
3000 }
3001
3002 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
3003 MACSEC_SECY_ATTR_PAD) ||
3004 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
3005 csid, MACSEC_SECY_ATTR_PAD) ||
3006 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
3007 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
3008 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
3009 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
3010 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
3011 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
3012 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
3013 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
3014 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
3015 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
3016 goto cancel;
3017
3018 if (secy->replay_protect) {
3019 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
3020 goto cancel;
3021 }
3022
3023 nla_nest_end(skb, secy_nest);
3024 return 0;
3025
3026 cancel:
3027 nla_nest_cancel(skb, secy_nest);
3028 return 1;
3029 }
3030
3031 static noinline_for_stack int
dump_secy(struct macsec_secy * secy,struct net_device * dev,struct sk_buff * skb,struct netlink_callback * cb)3032 dump_secy(struct macsec_secy *secy, struct net_device *dev,
3033 struct sk_buff *skb, struct netlink_callback *cb)
3034 {
3035 struct macsec_tx_sc_stats tx_sc_stats = {0, };
3036 struct macsec_tx_sa_stats tx_sa_stats = {0, };
3037 struct macsec_rx_sc_stats rx_sc_stats = {0, };
3038 struct macsec_rx_sa_stats rx_sa_stats = {0, };
3039 struct macsec_dev *macsec = netdev_priv(dev);
3040 struct macsec_dev_stats dev_stats = {0, };
3041 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3042 struct nlattr *txsa_list, *rxsc_list;
3043 struct macsec_rx_sc *rx_sc;
3044 struct nlattr *attr;
3045 void *hdr;
3046 int i, j;
3047
3048 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3049 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
3050 if (!hdr)
3051 return -EMSGSIZE;
3052
3053 genl_dump_check_consistent(cb, hdr);
3054
3055 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
3056 goto nla_put_failure;
3057
3058 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
3059 if (!attr)
3060 goto nla_put_failure;
3061 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
3062 goto nla_put_failure;
3063 nla_nest_end(skb, attr);
3064
3065 if (nla_put_secy(secy, skb))
3066 goto nla_put_failure;
3067
3068 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
3069 if (!attr)
3070 goto nla_put_failure;
3071
3072 get_tx_sc_stats(dev, &tx_sc_stats);
3073 if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
3074 nla_nest_cancel(skb, attr);
3075 goto nla_put_failure;
3076 }
3077 nla_nest_end(skb, attr);
3078
3079 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
3080 if (!attr)
3081 goto nla_put_failure;
3082 get_secy_stats(dev, &dev_stats);
3083 if (copy_secy_stats(skb, &dev_stats)) {
3084 nla_nest_cancel(skb, attr);
3085 goto nla_put_failure;
3086 }
3087 nla_nest_end(skb, attr);
3088
3089 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
3090 if (!txsa_list)
3091 goto nla_put_failure;
3092 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
3093 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
3094 struct nlattr *txsa_nest;
3095 u64 pn;
3096 int pn_len;
3097
3098 if (!tx_sa)
3099 continue;
3100
3101 txsa_nest = nla_nest_start_noflag(skb, j++);
3102 if (!txsa_nest) {
3103 nla_nest_cancel(skb, txsa_list);
3104 goto nla_put_failure;
3105 }
3106
3107 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
3108 if (!attr) {
3109 nla_nest_cancel(skb, txsa_nest);
3110 nla_nest_cancel(skb, txsa_list);
3111 goto nla_put_failure;
3112 }
3113 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
3114 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
3115 if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
3116 nla_nest_cancel(skb, attr);
3117 nla_nest_cancel(skb, txsa_nest);
3118 nla_nest_cancel(skb, txsa_list);
3119 goto nla_put_failure;
3120 }
3121 nla_nest_end(skb, attr);
3122
3123 if (secy->xpn) {
3124 pn = tx_sa->next_pn;
3125 pn_len = MACSEC_XPN_PN_LEN;
3126 } else {
3127 pn = tx_sa->next_pn_halves.lower;
3128 pn_len = MACSEC_DEFAULT_PN_LEN;
3129 }
3130
3131 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3132 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3133 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
3134 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
3135 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
3136 nla_nest_cancel(skb, txsa_nest);
3137 nla_nest_cancel(skb, txsa_list);
3138 goto nla_put_failure;
3139 }
3140
3141 nla_nest_end(skb, txsa_nest);
3142 }
3143 nla_nest_end(skb, txsa_list);
3144
3145 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
3146 if (!rxsc_list)
3147 goto nla_put_failure;
3148
3149 j = 1;
3150 for_each_rxsc_rtnl(secy, rx_sc) {
3151 int k;
3152 struct nlattr *rxsa_list;
3153 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
3154
3155 if (!rxsc_nest) {
3156 nla_nest_cancel(skb, rxsc_list);
3157 goto nla_put_failure;
3158 }
3159
3160 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
3161 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
3162 MACSEC_RXSC_ATTR_PAD)) {
3163 nla_nest_cancel(skb, rxsc_nest);
3164 nla_nest_cancel(skb, rxsc_list);
3165 goto nla_put_failure;
3166 }
3167
3168 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
3169 if (!attr) {
3170 nla_nest_cancel(skb, rxsc_nest);
3171 nla_nest_cancel(skb, rxsc_list);
3172 goto nla_put_failure;
3173 }
3174 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
3175 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
3176 if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
3177 nla_nest_cancel(skb, attr);
3178 nla_nest_cancel(skb, rxsc_nest);
3179 nla_nest_cancel(skb, rxsc_list);
3180 goto nla_put_failure;
3181 }
3182 nla_nest_end(skb, attr);
3183
3184 rxsa_list = nla_nest_start_noflag(skb,
3185 MACSEC_RXSC_ATTR_SA_LIST);
3186 if (!rxsa_list) {
3187 nla_nest_cancel(skb, rxsc_nest);
3188 nla_nest_cancel(skb, rxsc_list);
3189 goto nla_put_failure;
3190 }
3191
3192 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
3193 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
3194 struct nlattr *rxsa_nest;
3195 u64 pn;
3196 int pn_len;
3197
3198 if (!rx_sa)
3199 continue;
3200
3201 rxsa_nest = nla_nest_start_noflag(skb, k++);
3202 if (!rxsa_nest) {
3203 nla_nest_cancel(skb, rxsa_list);
3204 nla_nest_cancel(skb, rxsc_nest);
3205 nla_nest_cancel(skb, rxsc_list);
3206 goto nla_put_failure;
3207 }
3208
3209 attr = nla_nest_start_noflag(skb,
3210 MACSEC_SA_ATTR_STATS);
3211 if (!attr) {
3212 nla_nest_cancel(skb, rxsa_list);
3213 nla_nest_cancel(skb, rxsc_nest);
3214 nla_nest_cancel(skb, rxsc_list);
3215 goto nla_put_failure;
3216 }
3217 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
3218 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
3219 if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
3220 nla_nest_cancel(skb, attr);
3221 nla_nest_cancel(skb, rxsa_list);
3222 nla_nest_cancel(skb, rxsc_nest);
3223 nla_nest_cancel(skb, rxsc_list);
3224 goto nla_put_failure;
3225 }
3226 nla_nest_end(skb, attr);
3227
3228 if (secy->xpn) {
3229 pn = rx_sa->next_pn;
3230 pn_len = MACSEC_XPN_PN_LEN;
3231 } else {
3232 pn = rx_sa->next_pn_halves.lower;
3233 pn_len = MACSEC_DEFAULT_PN_LEN;
3234 }
3235
3236 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3237 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3238 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
3239 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
3240 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
3241 nla_nest_cancel(skb, rxsa_nest);
3242 nla_nest_cancel(skb, rxsc_nest);
3243 nla_nest_cancel(skb, rxsc_list);
3244 goto nla_put_failure;
3245 }
3246 nla_nest_end(skb, rxsa_nest);
3247 }
3248
3249 nla_nest_end(skb, rxsa_list);
3250 nla_nest_end(skb, rxsc_nest);
3251 }
3252
3253 nla_nest_end(skb, rxsc_list);
3254
3255 genlmsg_end(skb, hdr);
3256
3257 return 0;
3258
3259 nla_put_failure:
3260 genlmsg_cancel(skb, hdr);
3261 return -EMSGSIZE;
3262 }
3263
3264 static int macsec_generation = 1; /* protected by RTNL */
3265
macsec_dump_txsc(struct sk_buff * skb,struct netlink_callback * cb)3266 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
3267 {
3268 struct net *net = sock_net(skb->sk);
3269 struct net_device *dev;
3270 int dev_idx, d;
3271
3272 dev_idx = cb->args[0];
3273
3274 d = 0;
3275 rtnl_lock();
3276
3277 cb->seq = macsec_generation;
3278
3279 for_each_netdev(net, dev) {
3280 struct macsec_secy *secy;
3281
3282 if (d < dev_idx)
3283 goto next;
3284
3285 if (!netif_is_macsec(dev))
3286 goto next;
3287
3288 secy = &macsec_priv(dev)->secy;
3289 if (dump_secy(secy, dev, skb, cb) < 0)
3290 goto done;
3291 next:
3292 d++;
3293 }
3294
3295 done:
3296 rtnl_unlock();
3297 cb->args[0] = d;
3298 return skb->len;
3299 }
3300
3301 static const struct genl_small_ops macsec_genl_ops[] = {
3302 {
3303 .cmd = MACSEC_CMD_GET_TXSC,
3304 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3305 .dumpit = macsec_dump_txsc,
3306 },
3307 {
3308 .cmd = MACSEC_CMD_ADD_RXSC,
3309 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3310 .doit = macsec_add_rxsc,
3311 .flags = GENL_ADMIN_PERM,
3312 },
3313 {
3314 .cmd = MACSEC_CMD_DEL_RXSC,
3315 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3316 .doit = macsec_del_rxsc,
3317 .flags = GENL_ADMIN_PERM,
3318 },
3319 {
3320 .cmd = MACSEC_CMD_UPD_RXSC,
3321 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3322 .doit = macsec_upd_rxsc,
3323 .flags = GENL_ADMIN_PERM,
3324 },
3325 {
3326 .cmd = MACSEC_CMD_ADD_TXSA,
3327 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3328 .doit = macsec_add_txsa,
3329 .flags = GENL_ADMIN_PERM,
3330 },
3331 {
3332 .cmd = MACSEC_CMD_DEL_TXSA,
3333 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3334 .doit = macsec_del_txsa,
3335 .flags = GENL_ADMIN_PERM,
3336 },
3337 {
3338 .cmd = MACSEC_CMD_UPD_TXSA,
3339 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3340 .doit = macsec_upd_txsa,
3341 .flags = GENL_ADMIN_PERM,
3342 },
3343 {
3344 .cmd = MACSEC_CMD_ADD_RXSA,
3345 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3346 .doit = macsec_add_rxsa,
3347 .flags = GENL_ADMIN_PERM,
3348 },
3349 {
3350 .cmd = MACSEC_CMD_DEL_RXSA,
3351 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3352 .doit = macsec_del_rxsa,
3353 .flags = GENL_ADMIN_PERM,
3354 },
3355 {
3356 .cmd = MACSEC_CMD_UPD_RXSA,
3357 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3358 .doit = macsec_upd_rxsa,
3359 .flags = GENL_ADMIN_PERM,
3360 },
3361 {
3362 .cmd = MACSEC_CMD_UPD_OFFLOAD,
3363 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3364 .doit = macsec_upd_offload,
3365 .flags = GENL_ADMIN_PERM,
3366 },
3367 };
3368
3369 static struct genl_family macsec_fam __ro_after_init = {
3370 .name = MACSEC_GENL_NAME,
3371 .hdrsize = 0,
3372 .version = MACSEC_GENL_VERSION,
3373 .maxattr = MACSEC_ATTR_MAX,
3374 .policy = macsec_genl_policy,
3375 .netnsok = true,
3376 .module = THIS_MODULE,
3377 .small_ops = macsec_genl_ops,
3378 .n_small_ops = ARRAY_SIZE(macsec_genl_ops),
3379 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1,
3380 };
3381
macsec_start_xmit(struct sk_buff * skb,struct net_device * dev)3382 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3383 struct net_device *dev)
3384 {
3385 struct macsec_dev *macsec = netdev_priv(dev);
3386 struct macsec_secy *secy = &macsec->secy;
3387 struct pcpu_secy_stats *secy_stats;
3388 int ret, len;
3389
3390 if (macsec_is_offloaded(netdev_priv(dev))) {
3391 struct metadata_dst *md_dst = secy->tx_sc.md_dst;
3392
3393 skb_dst_drop(skb);
3394 dst_hold(&md_dst->dst);
3395 skb_dst_set(skb, &md_dst->dst);
3396 skb->dev = macsec->real_dev;
3397 return dev_queue_xmit(skb);
3398 }
3399
3400 /* 10.5 */
3401 if (!secy->protect_frames) {
3402 secy_stats = this_cpu_ptr(macsec->stats);
3403 u64_stats_update_begin(&secy_stats->syncp);
3404 secy_stats->stats.OutPktsUntagged++;
3405 u64_stats_update_end(&secy_stats->syncp);
3406 skb->dev = macsec->real_dev;
3407 len = skb->len;
3408 ret = dev_queue_xmit(skb);
3409 count_tx(dev, ret, len);
3410 return ret;
3411 }
3412
3413 if (!secy->operational) {
3414 kfree_skb(skb);
3415 DEV_STATS_INC(dev, tx_dropped);
3416 return NETDEV_TX_OK;
3417 }
3418
3419 len = skb->len;
3420 skb = macsec_encrypt(skb, dev);
3421 if (IS_ERR(skb)) {
3422 if (PTR_ERR(skb) != -EINPROGRESS)
3423 DEV_STATS_INC(dev, tx_dropped);
3424 return NETDEV_TX_OK;
3425 }
3426
3427 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3428
3429 macsec_encrypt_finish(skb, dev);
3430 ret = dev_queue_xmit(skb);
3431 count_tx(dev, ret, len);
3432 return ret;
3433 }
3434
3435 #define MACSEC_FEATURES \
3436 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3437
macsec_dev_init(struct net_device * dev)3438 static int macsec_dev_init(struct net_device *dev)
3439 {
3440 struct macsec_dev *macsec = macsec_priv(dev);
3441 struct net_device *real_dev = macsec->real_dev;
3442 int err;
3443
3444 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3445 if (!dev->tstats)
3446 return -ENOMEM;
3447
3448 err = gro_cells_init(&macsec->gro_cells, dev);
3449 if (err) {
3450 free_percpu(dev->tstats);
3451 return err;
3452 }
3453
3454 dev->features = real_dev->features & MACSEC_FEATURES;
3455 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
3456
3457 dev->needed_headroom = real_dev->needed_headroom +
3458 MACSEC_NEEDED_HEADROOM;
3459 dev->needed_tailroom = real_dev->needed_tailroom +
3460 MACSEC_NEEDED_TAILROOM;
3461
3462 if (is_zero_ether_addr(dev->dev_addr))
3463 eth_hw_addr_inherit(dev, real_dev);
3464 if (is_zero_ether_addr(dev->broadcast))
3465 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3466
3467 /* Get macsec's reference to real_dev */
3468 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL);
3469
3470 return 0;
3471 }
3472
macsec_dev_uninit(struct net_device * dev)3473 static void macsec_dev_uninit(struct net_device *dev)
3474 {
3475 struct macsec_dev *macsec = macsec_priv(dev);
3476
3477 gro_cells_destroy(&macsec->gro_cells);
3478 free_percpu(dev->tstats);
3479 }
3480
macsec_fix_features(struct net_device * dev,netdev_features_t features)3481 static netdev_features_t macsec_fix_features(struct net_device *dev,
3482 netdev_features_t features)
3483 {
3484 struct macsec_dev *macsec = macsec_priv(dev);
3485 struct net_device *real_dev = macsec->real_dev;
3486
3487 features &= (real_dev->features & MACSEC_FEATURES) |
3488 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3489 features |= NETIF_F_LLTX;
3490
3491 return features;
3492 }
3493
macsec_dev_open(struct net_device * dev)3494 static int macsec_dev_open(struct net_device *dev)
3495 {
3496 struct macsec_dev *macsec = macsec_priv(dev);
3497 struct net_device *real_dev = macsec->real_dev;
3498 int err;
3499
3500 err = dev_uc_add(real_dev, dev->dev_addr);
3501 if (err < 0)
3502 return err;
3503
3504 if (dev->flags & IFF_ALLMULTI) {
3505 err = dev_set_allmulti(real_dev, 1);
3506 if (err < 0)
3507 goto del_unicast;
3508 }
3509
3510 if (dev->flags & IFF_PROMISC) {
3511 err = dev_set_promiscuity(real_dev, 1);
3512 if (err < 0)
3513 goto clear_allmulti;
3514 }
3515
3516 /* If h/w offloading is available, propagate to the device */
3517 if (macsec_is_offloaded(macsec)) {
3518 const struct macsec_ops *ops;
3519 struct macsec_context ctx;
3520
3521 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3522 if (!ops) {
3523 err = -EOPNOTSUPP;
3524 goto clear_allmulti;
3525 }
3526
3527 ctx.secy = &macsec->secy;
3528 err = macsec_offload(ops->mdo_dev_open, &ctx);
3529 if (err)
3530 goto clear_allmulti;
3531 }
3532
3533 if (netif_carrier_ok(real_dev))
3534 netif_carrier_on(dev);
3535
3536 return 0;
3537 clear_allmulti:
3538 if (dev->flags & IFF_ALLMULTI)
3539 dev_set_allmulti(real_dev, -1);
3540 del_unicast:
3541 dev_uc_del(real_dev, dev->dev_addr);
3542 netif_carrier_off(dev);
3543 return err;
3544 }
3545
macsec_dev_stop(struct net_device * dev)3546 static int macsec_dev_stop(struct net_device *dev)
3547 {
3548 struct macsec_dev *macsec = macsec_priv(dev);
3549 struct net_device *real_dev = macsec->real_dev;
3550
3551 netif_carrier_off(dev);
3552
3553 /* If h/w offloading is available, propagate to the device */
3554 if (macsec_is_offloaded(macsec)) {
3555 const struct macsec_ops *ops;
3556 struct macsec_context ctx;
3557
3558 ops = macsec_get_ops(macsec, &ctx);
3559 if (ops) {
3560 ctx.secy = &macsec->secy;
3561 macsec_offload(ops->mdo_dev_stop, &ctx);
3562 }
3563 }
3564
3565 dev_mc_unsync(real_dev, dev);
3566 dev_uc_unsync(real_dev, dev);
3567
3568 if (dev->flags & IFF_ALLMULTI)
3569 dev_set_allmulti(real_dev, -1);
3570
3571 if (dev->flags & IFF_PROMISC)
3572 dev_set_promiscuity(real_dev, -1);
3573
3574 dev_uc_del(real_dev, dev->dev_addr);
3575
3576 return 0;
3577 }
3578
macsec_dev_change_rx_flags(struct net_device * dev,int change)3579 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3580 {
3581 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3582
3583 if (!(dev->flags & IFF_UP))
3584 return;
3585
3586 if (change & IFF_ALLMULTI)
3587 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3588
3589 if (change & IFF_PROMISC)
3590 dev_set_promiscuity(real_dev,
3591 dev->flags & IFF_PROMISC ? 1 : -1);
3592 }
3593
macsec_dev_set_rx_mode(struct net_device * dev)3594 static void macsec_dev_set_rx_mode(struct net_device *dev)
3595 {
3596 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3597
3598 dev_mc_sync(real_dev, dev);
3599 dev_uc_sync(real_dev, dev);
3600 }
3601
macsec_set_mac_address(struct net_device * dev,void * p)3602 static int macsec_set_mac_address(struct net_device *dev, void *p)
3603 {
3604 struct macsec_dev *macsec = macsec_priv(dev);
3605 struct net_device *real_dev = macsec->real_dev;
3606 struct sockaddr *addr = p;
3607 int err;
3608
3609 if (!is_valid_ether_addr(addr->sa_data))
3610 return -EADDRNOTAVAIL;
3611
3612 if (!(dev->flags & IFF_UP))
3613 goto out;
3614
3615 err = dev_uc_add(real_dev, addr->sa_data);
3616 if (err < 0)
3617 return err;
3618
3619 dev_uc_del(real_dev, dev->dev_addr);
3620
3621 out:
3622 eth_hw_addr_set(dev, addr->sa_data);
3623
3624 /* If h/w offloading is available, propagate to the device */
3625 if (macsec_is_offloaded(macsec)) {
3626 const struct macsec_ops *ops;
3627 struct macsec_context ctx;
3628
3629 ops = macsec_get_ops(macsec, &ctx);
3630 if (ops) {
3631 ctx.secy = &macsec->secy;
3632 macsec_offload(ops->mdo_upd_secy, &ctx);
3633 }
3634 }
3635
3636 return 0;
3637 }
3638
macsec_change_mtu(struct net_device * dev,int new_mtu)3639 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3640 {
3641 struct macsec_dev *macsec = macsec_priv(dev);
3642 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3643
3644 if (macsec->real_dev->mtu - extra < new_mtu)
3645 return -ERANGE;
3646
3647 dev->mtu = new_mtu;
3648
3649 return 0;
3650 }
3651
macsec_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * s)3652 static void macsec_get_stats64(struct net_device *dev,
3653 struct rtnl_link_stats64 *s)
3654 {
3655 if (!dev->tstats)
3656 return;
3657
3658 dev_fetch_sw_netstats(s, dev->tstats);
3659
3660 s->rx_dropped = DEV_STATS_READ(dev, rx_dropped);
3661 s->tx_dropped = DEV_STATS_READ(dev, tx_dropped);
3662 s->rx_errors = DEV_STATS_READ(dev, rx_errors);
3663 }
3664
macsec_get_iflink(const struct net_device * dev)3665 static int macsec_get_iflink(const struct net_device *dev)
3666 {
3667 return macsec_priv(dev)->real_dev->ifindex;
3668 }
3669
3670 static const struct net_device_ops macsec_netdev_ops = {
3671 .ndo_init = macsec_dev_init,
3672 .ndo_uninit = macsec_dev_uninit,
3673 .ndo_open = macsec_dev_open,
3674 .ndo_stop = macsec_dev_stop,
3675 .ndo_fix_features = macsec_fix_features,
3676 .ndo_change_mtu = macsec_change_mtu,
3677 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
3678 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
3679 .ndo_set_mac_address = macsec_set_mac_address,
3680 .ndo_start_xmit = macsec_start_xmit,
3681 .ndo_get_stats64 = macsec_get_stats64,
3682 .ndo_get_iflink = macsec_get_iflink,
3683 };
3684
3685 static const struct device_type macsec_type = {
3686 .name = "macsec",
3687 };
3688
3689 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3690 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3691 [IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3692 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3693 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3694 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3695 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3696 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3697 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3698 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3699 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3700 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3701 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3702 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3703 [IFLA_MACSEC_OFFLOAD] = { .type = NLA_U8 },
3704 };
3705
macsec_free_netdev(struct net_device * dev)3706 static void macsec_free_netdev(struct net_device *dev)
3707 {
3708 struct macsec_dev *macsec = macsec_priv(dev);
3709
3710 if (macsec->secy.tx_sc.md_dst)
3711 metadata_dst_free(macsec->secy.tx_sc.md_dst);
3712 free_percpu(macsec->stats);
3713 free_percpu(macsec->secy.tx_sc.stats);
3714
3715 /* Get rid of the macsec's reference to real_dev */
3716 netdev_put(macsec->real_dev, &macsec->dev_tracker);
3717 }
3718
macsec_setup(struct net_device * dev)3719 static void macsec_setup(struct net_device *dev)
3720 {
3721 ether_setup(dev);
3722 dev->min_mtu = 0;
3723 dev->max_mtu = ETH_MAX_MTU;
3724 dev->priv_flags |= IFF_NO_QUEUE;
3725 dev->netdev_ops = &macsec_netdev_ops;
3726 dev->needs_free_netdev = true;
3727 dev->priv_destructor = macsec_free_netdev;
3728 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3729
3730 eth_zero_addr(dev->broadcast);
3731 }
3732
macsec_changelink_common(struct net_device * dev,struct nlattr * data[])3733 static int macsec_changelink_common(struct net_device *dev,
3734 struct nlattr *data[])
3735 {
3736 struct macsec_secy *secy;
3737 struct macsec_tx_sc *tx_sc;
3738
3739 secy = &macsec_priv(dev)->secy;
3740 tx_sc = &secy->tx_sc;
3741
3742 if (data[IFLA_MACSEC_ENCODING_SA]) {
3743 struct macsec_tx_sa *tx_sa;
3744
3745 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3746 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3747
3748 secy->operational = tx_sa && tx_sa->active;
3749 }
3750
3751 if (data[IFLA_MACSEC_ENCRYPT])
3752 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3753
3754 if (data[IFLA_MACSEC_PROTECT])
3755 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3756
3757 if (data[IFLA_MACSEC_INC_SCI])
3758 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3759
3760 if (data[IFLA_MACSEC_ES])
3761 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3762
3763 if (data[IFLA_MACSEC_SCB])
3764 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3765
3766 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3767 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3768
3769 if (data[IFLA_MACSEC_VALIDATION])
3770 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3771
3772 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3773 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3774 case MACSEC_CIPHER_ID_GCM_AES_128:
3775 case MACSEC_DEFAULT_CIPHER_ID:
3776 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3777 secy->xpn = false;
3778 break;
3779 case MACSEC_CIPHER_ID_GCM_AES_256:
3780 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3781 secy->xpn = false;
3782 break;
3783 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
3784 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3785 secy->xpn = true;
3786 break;
3787 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
3788 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3789 secy->xpn = true;
3790 break;
3791 default:
3792 return -EINVAL;
3793 }
3794 }
3795
3796 if (data[IFLA_MACSEC_WINDOW]) {
3797 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3798
3799 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window
3800 * for XPN cipher suites */
3801 if (secy->xpn &&
3802 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW)
3803 return -EINVAL;
3804 }
3805
3806 return 0;
3807 }
3808
macsec_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)3809 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3810 struct nlattr *data[],
3811 struct netlink_ext_ack *extack)
3812 {
3813 struct macsec_dev *macsec = macsec_priv(dev);
3814 bool macsec_offload_state_change = false;
3815 enum macsec_offload offload;
3816 struct macsec_tx_sc tx_sc;
3817 struct macsec_secy secy;
3818 int ret;
3819
3820 if (!data)
3821 return 0;
3822
3823 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3824 data[IFLA_MACSEC_ICV_LEN] ||
3825 data[IFLA_MACSEC_SCI] ||
3826 data[IFLA_MACSEC_PORT])
3827 return -EINVAL;
3828
3829 /* Keep a copy of unmodified secy and tx_sc, in case the offload
3830 * propagation fails, to revert macsec_changelink_common.
3831 */
3832 memcpy(&secy, &macsec->secy, sizeof(secy));
3833 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3834
3835 ret = macsec_changelink_common(dev, data);
3836 if (ret)
3837 goto cleanup;
3838
3839 if (data[IFLA_MACSEC_OFFLOAD]) {
3840 offload = nla_get_u8(data[IFLA_MACSEC_OFFLOAD]);
3841 if (macsec->offload != offload) {
3842 macsec_offload_state_change = true;
3843 ret = macsec_update_offload(dev, offload);
3844 if (ret)
3845 goto cleanup;
3846 }
3847 }
3848
3849 /* If h/w offloading is available, propagate to the device */
3850 if (!macsec_offload_state_change && macsec_is_offloaded(macsec)) {
3851 const struct macsec_ops *ops;
3852 struct macsec_context ctx;
3853
3854 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3855 if (!ops) {
3856 ret = -EOPNOTSUPP;
3857 goto cleanup;
3858 }
3859
3860 ctx.secy = &macsec->secy;
3861 ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3862 if (ret)
3863 goto cleanup;
3864 }
3865
3866 return 0;
3867
3868 cleanup:
3869 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3870 memcpy(&macsec->secy, &secy, sizeof(secy));
3871
3872 return ret;
3873 }
3874
macsec_del_dev(struct macsec_dev * macsec)3875 static void macsec_del_dev(struct macsec_dev *macsec)
3876 {
3877 int i;
3878
3879 while (macsec->secy.rx_sc) {
3880 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3881
3882 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3883 free_rx_sc(rx_sc);
3884 }
3885
3886 for (i = 0; i < MACSEC_NUM_AN; i++) {
3887 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3888
3889 if (sa) {
3890 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3891 clear_tx_sa(sa);
3892 }
3893 }
3894 }
3895
macsec_common_dellink(struct net_device * dev,struct list_head * head)3896 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3897 {
3898 struct macsec_dev *macsec = macsec_priv(dev);
3899 struct net_device *real_dev = macsec->real_dev;
3900
3901 /* If h/w offloading is available, propagate to the device */
3902 if (macsec_is_offloaded(macsec)) {
3903 const struct macsec_ops *ops;
3904 struct macsec_context ctx;
3905
3906 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3907 if (ops) {
3908 ctx.secy = &macsec->secy;
3909 macsec_offload(ops->mdo_del_secy, &ctx);
3910 }
3911 }
3912
3913 unregister_netdevice_queue(dev, head);
3914 list_del_rcu(&macsec->secys);
3915 macsec_del_dev(macsec);
3916 netdev_upper_dev_unlink(real_dev, dev);
3917
3918 macsec_generation++;
3919 }
3920
macsec_dellink(struct net_device * dev,struct list_head * head)3921 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3922 {
3923 struct macsec_dev *macsec = macsec_priv(dev);
3924 struct net_device *real_dev = macsec->real_dev;
3925 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3926
3927 macsec_common_dellink(dev, head);
3928
3929 if (list_empty(&rxd->secys)) {
3930 netdev_rx_handler_unregister(real_dev);
3931 kfree(rxd);
3932 }
3933 }
3934
register_macsec_dev(struct net_device * real_dev,struct net_device * dev)3935 static int register_macsec_dev(struct net_device *real_dev,
3936 struct net_device *dev)
3937 {
3938 struct macsec_dev *macsec = macsec_priv(dev);
3939 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3940
3941 if (!rxd) {
3942 int err;
3943
3944 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3945 if (!rxd)
3946 return -ENOMEM;
3947
3948 INIT_LIST_HEAD(&rxd->secys);
3949
3950 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3951 rxd);
3952 if (err < 0) {
3953 kfree(rxd);
3954 return err;
3955 }
3956 }
3957
3958 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3959 return 0;
3960 }
3961
sci_exists(struct net_device * dev,sci_t sci)3962 static bool sci_exists(struct net_device *dev, sci_t sci)
3963 {
3964 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3965 struct macsec_dev *macsec;
3966
3967 list_for_each_entry(macsec, &rxd->secys, secys) {
3968 if (macsec->secy.sci == sci)
3969 return true;
3970 }
3971
3972 return false;
3973 }
3974
dev_to_sci(struct net_device * dev,__be16 port)3975 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3976 {
3977 return make_sci(dev->dev_addr, port);
3978 }
3979
macsec_add_dev(struct net_device * dev,sci_t sci,u8 icv_len)3980 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3981 {
3982 struct macsec_dev *macsec = macsec_priv(dev);
3983 struct macsec_secy *secy = &macsec->secy;
3984
3985 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3986 if (!macsec->stats)
3987 return -ENOMEM;
3988
3989 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3990 if (!secy->tx_sc.stats)
3991 return -ENOMEM;
3992
3993 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL);
3994 if (!secy->tx_sc.md_dst)
3995 /* macsec and secy percpu stats will be freed when unregistering
3996 * net_device in macsec_free_netdev()
3997 */
3998 return -ENOMEM;
3999
4000 if (sci == MACSEC_UNDEF_SCI)
4001 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4002
4003 secy->netdev = dev;
4004 secy->operational = true;
4005 secy->key_len = DEFAULT_SAK_LEN;
4006 secy->icv_len = icv_len;
4007 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
4008 secy->protect_frames = true;
4009 secy->replay_protect = false;
4010 secy->xpn = DEFAULT_XPN;
4011
4012 secy->sci = sci;
4013 secy->tx_sc.md_dst->u.macsec_info.sci = sci;
4014 secy->tx_sc.active = true;
4015 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
4016 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
4017 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
4018 secy->tx_sc.end_station = false;
4019 secy->tx_sc.scb = false;
4020
4021 return 0;
4022 }
4023
4024 static struct lock_class_key macsec_netdev_addr_lock_key;
4025
macsec_newlink(struct net * net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)4026 static int macsec_newlink(struct net *net, struct net_device *dev,
4027 struct nlattr *tb[], struct nlattr *data[],
4028 struct netlink_ext_ack *extack)
4029 {
4030 struct macsec_dev *macsec = macsec_priv(dev);
4031 rx_handler_func_t *rx_handler;
4032 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4033 struct net_device *real_dev;
4034 int err, mtu;
4035 sci_t sci;
4036
4037 if (!tb[IFLA_LINK])
4038 return -EINVAL;
4039 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
4040 if (!real_dev)
4041 return -ENODEV;
4042 if (real_dev->type != ARPHRD_ETHER)
4043 return -EINVAL;
4044
4045 dev->priv_flags |= IFF_MACSEC;
4046
4047 macsec->real_dev = real_dev;
4048
4049 if (data && data[IFLA_MACSEC_OFFLOAD])
4050 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
4051 else
4052 /* MACsec offloading is off by default */
4053 macsec->offload = MACSEC_OFFLOAD_OFF;
4054
4055 /* Check if the offloading mode is supported by the underlying layers */
4056 if (macsec->offload != MACSEC_OFFLOAD_OFF &&
4057 !macsec_check_offload(macsec->offload, macsec))
4058 return -EOPNOTSUPP;
4059
4060 /* send_sci must be set to true when transmit sci explicitly is set */
4061 if ((data && data[IFLA_MACSEC_SCI]) &&
4062 (data && data[IFLA_MACSEC_INC_SCI])) {
4063 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
4064
4065 if (!send_sci)
4066 return -EINVAL;
4067 }
4068
4069 if (data && data[IFLA_MACSEC_ICV_LEN])
4070 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4071 mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
4072 if (mtu < 0)
4073 dev->mtu = 0;
4074 else
4075 dev->mtu = mtu;
4076
4077 rx_handler = rtnl_dereference(real_dev->rx_handler);
4078 if (rx_handler && rx_handler != macsec_handle_frame)
4079 return -EBUSY;
4080
4081 err = register_netdevice(dev);
4082 if (err < 0)
4083 return err;
4084
4085 netdev_lockdep_set_classes(dev);
4086 lockdep_set_class(&dev->addr_list_lock,
4087 &macsec_netdev_addr_lock_key);
4088
4089 err = netdev_upper_dev_link(real_dev, dev, extack);
4090 if (err < 0)
4091 goto unregister;
4092
4093 /* need to be already registered so that ->init has run and
4094 * the MAC addr is set
4095 */
4096 if (data && data[IFLA_MACSEC_SCI])
4097 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
4098 else if (data && data[IFLA_MACSEC_PORT])
4099 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
4100 else
4101 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4102
4103 if (rx_handler && sci_exists(real_dev, sci)) {
4104 err = -EBUSY;
4105 goto unlink;
4106 }
4107
4108 err = macsec_add_dev(dev, sci, icv_len);
4109 if (err)
4110 goto unlink;
4111
4112 if (data) {
4113 err = macsec_changelink_common(dev, data);
4114 if (err)
4115 goto del_dev;
4116 }
4117
4118 /* If h/w offloading is available, propagate to the device */
4119 if (macsec_is_offloaded(macsec)) {
4120 const struct macsec_ops *ops;
4121 struct macsec_context ctx;
4122
4123 ops = macsec_get_ops(macsec, &ctx);
4124 if (ops) {
4125 ctx.secy = &macsec->secy;
4126 err = macsec_offload(ops->mdo_add_secy, &ctx);
4127 if (err)
4128 goto del_dev;
4129 }
4130 }
4131
4132 err = register_macsec_dev(real_dev, dev);
4133 if (err < 0)
4134 goto del_dev;
4135
4136 netif_stacked_transfer_operstate(real_dev, dev);
4137 linkwatch_fire_event(dev);
4138
4139 macsec_generation++;
4140
4141 return 0;
4142
4143 del_dev:
4144 macsec_del_dev(macsec);
4145 unlink:
4146 netdev_upper_dev_unlink(real_dev, dev);
4147 unregister:
4148 unregister_netdevice(dev);
4149 return err;
4150 }
4151
macsec_validate_attr(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)4152 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
4153 struct netlink_ext_ack *extack)
4154 {
4155 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
4156 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4157 int flag;
4158 bool es, scb, sci;
4159
4160 if (!data)
4161 return 0;
4162
4163 if (data[IFLA_MACSEC_CIPHER_SUITE])
4164 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
4165
4166 if (data[IFLA_MACSEC_ICV_LEN]) {
4167 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4168 if (icv_len != MACSEC_DEFAULT_ICV_LEN) {
4169 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
4170 struct crypto_aead *dummy_tfm;
4171
4172 dummy_tfm = macsec_alloc_tfm(dummy_key,
4173 DEFAULT_SAK_LEN,
4174 icv_len);
4175 if (IS_ERR(dummy_tfm))
4176 return PTR_ERR(dummy_tfm);
4177 crypto_free_aead(dummy_tfm);
4178 }
4179 }
4180
4181 switch (csid) {
4182 case MACSEC_CIPHER_ID_GCM_AES_128:
4183 case MACSEC_CIPHER_ID_GCM_AES_256:
4184 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
4185 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
4186 case MACSEC_DEFAULT_CIPHER_ID:
4187 if (icv_len < MACSEC_MIN_ICV_LEN ||
4188 icv_len > MACSEC_STD_ICV_LEN)
4189 return -EINVAL;
4190 break;
4191 default:
4192 return -EINVAL;
4193 }
4194
4195 if (data[IFLA_MACSEC_ENCODING_SA]) {
4196 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
4197 return -EINVAL;
4198 }
4199
4200 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
4201 flag < IFLA_MACSEC_VALIDATION;
4202 flag++) {
4203 if (data[flag]) {
4204 if (nla_get_u8(data[flag]) > 1)
4205 return -EINVAL;
4206 }
4207 }
4208
4209 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
4210 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
4211 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
4212
4213 if ((sci && (scb || es)) || (scb && es))
4214 return -EINVAL;
4215
4216 if (data[IFLA_MACSEC_VALIDATION] &&
4217 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
4218 return -EINVAL;
4219
4220 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
4221 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
4222 !data[IFLA_MACSEC_WINDOW])
4223 return -EINVAL;
4224
4225 return 0;
4226 }
4227
macsec_get_link_net(const struct net_device * dev)4228 static struct net *macsec_get_link_net(const struct net_device *dev)
4229 {
4230 return dev_net(macsec_priv(dev)->real_dev);
4231 }
4232
macsec_get_real_dev(const struct net_device * dev)4233 struct net_device *macsec_get_real_dev(const struct net_device *dev)
4234 {
4235 return macsec_priv(dev)->real_dev;
4236 }
4237 EXPORT_SYMBOL_GPL(macsec_get_real_dev);
4238
macsec_netdev_is_offloaded(struct net_device * dev)4239 bool macsec_netdev_is_offloaded(struct net_device *dev)
4240 {
4241 return macsec_is_offloaded(macsec_priv(dev));
4242 }
4243 EXPORT_SYMBOL_GPL(macsec_netdev_is_offloaded);
4244
macsec_get_size(const struct net_device * dev)4245 static size_t macsec_get_size(const struct net_device *dev)
4246 {
4247 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
4248 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
4249 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
4250 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
4251 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
4252 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
4253 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
4254 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
4255 nla_total_size(1) + /* IFLA_MACSEC_ES */
4256 nla_total_size(1) + /* IFLA_MACSEC_SCB */
4257 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
4258 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
4259 nla_total_size(1) + /* IFLA_MACSEC_OFFLOAD */
4260 0;
4261 }
4262
macsec_fill_info(struct sk_buff * skb,const struct net_device * dev)4263 static int macsec_fill_info(struct sk_buff *skb,
4264 const struct net_device *dev)
4265 {
4266 struct macsec_tx_sc *tx_sc;
4267 struct macsec_dev *macsec;
4268 struct macsec_secy *secy;
4269 u64 csid;
4270
4271 macsec = macsec_priv(dev);
4272 secy = &macsec->secy;
4273 tx_sc = &secy->tx_sc;
4274
4275 switch (secy->key_len) {
4276 case MACSEC_GCM_AES_128_SAK_LEN:
4277 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
4278 break;
4279 case MACSEC_GCM_AES_256_SAK_LEN:
4280 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
4281 break;
4282 default:
4283 goto nla_put_failure;
4284 }
4285
4286 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
4287 IFLA_MACSEC_PAD) ||
4288 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
4289 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
4290 csid, IFLA_MACSEC_PAD) ||
4291 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
4292 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
4293 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
4294 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
4295 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
4296 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
4297 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
4298 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
4299 nla_put_u8(skb, IFLA_MACSEC_OFFLOAD, macsec->offload) ||
4300 0)
4301 goto nla_put_failure;
4302
4303 if (secy->replay_protect) {
4304 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
4305 goto nla_put_failure;
4306 }
4307
4308 return 0;
4309
4310 nla_put_failure:
4311 return -EMSGSIZE;
4312 }
4313
4314 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
4315 .kind = "macsec",
4316 .priv_size = sizeof(struct macsec_dev),
4317 .maxtype = IFLA_MACSEC_MAX,
4318 .policy = macsec_rtnl_policy,
4319 .setup = macsec_setup,
4320 .validate = macsec_validate_attr,
4321 .newlink = macsec_newlink,
4322 .changelink = macsec_changelink,
4323 .dellink = macsec_dellink,
4324 .get_size = macsec_get_size,
4325 .fill_info = macsec_fill_info,
4326 .get_link_net = macsec_get_link_net,
4327 };
4328
is_macsec_master(struct net_device * dev)4329 static bool is_macsec_master(struct net_device *dev)
4330 {
4331 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
4332 }
4333
macsec_notify(struct notifier_block * this,unsigned long event,void * ptr)4334 static int macsec_notify(struct notifier_block *this, unsigned long event,
4335 void *ptr)
4336 {
4337 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
4338 LIST_HEAD(head);
4339
4340 if (!is_macsec_master(real_dev))
4341 return NOTIFY_DONE;
4342
4343 switch (event) {
4344 case NETDEV_DOWN:
4345 case NETDEV_UP:
4346 case NETDEV_CHANGE: {
4347 struct macsec_dev *m, *n;
4348 struct macsec_rxh_data *rxd;
4349
4350 rxd = macsec_data_rtnl(real_dev);
4351 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4352 struct net_device *dev = m->secy.netdev;
4353
4354 netif_stacked_transfer_operstate(real_dev, dev);
4355 }
4356 break;
4357 }
4358 case NETDEV_UNREGISTER: {
4359 struct macsec_dev *m, *n;
4360 struct macsec_rxh_data *rxd;
4361
4362 rxd = macsec_data_rtnl(real_dev);
4363 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4364 macsec_common_dellink(m->secy.netdev, &head);
4365 }
4366
4367 netdev_rx_handler_unregister(real_dev);
4368 kfree(rxd);
4369
4370 unregister_netdevice_many(&head);
4371 break;
4372 }
4373 case NETDEV_CHANGEMTU: {
4374 struct macsec_dev *m;
4375 struct macsec_rxh_data *rxd;
4376
4377 rxd = macsec_data_rtnl(real_dev);
4378 list_for_each_entry(m, &rxd->secys, secys) {
4379 struct net_device *dev = m->secy.netdev;
4380 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
4381 macsec_extra_len(true));
4382
4383 if (dev->mtu > mtu)
4384 dev_set_mtu(dev, mtu);
4385 }
4386 }
4387 }
4388
4389 return NOTIFY_OK;
4390 }
4391
4392 static struct notifier_block macsec_notifier = {
4393 .notifier_call = macsec_notify,
4394 };
4395
macsec_init(void)4396 static int __init macsec_init(void)
4397 {
4398 int err;
4399
4400 pr_info("MACsec IEEE 802.1AE\n");
4401 err = register_netdevice_notifier(&macsec_notifier);
4402 if (err)
4403 return err;
4404
4405 err = rtnl_link_register(&macsec_link_ops);
4406 if (err)
4407 goto notifier;
4408
4409 err = genl_register_family(&macsec_fam);
4410 if (err)
4411 goto rtnl;
4412
4413 return 0;
4414
4415 rtnl:
4416 rtnl_link_unregister(&macsec_link_ops);
4417 notifier:
4418 unregister_netdevice_notifier(&macsec_notifier);
4419 return err;
4420 }
4421
macsec_exit(void)4422 static void __exit macsec_exit(void)
4423 {
4424 genl_unregister_family(&macsec_fam);
4425 rtnl_link_unregister(&macsec_link_ops);
4426 unregister_netdevice_notifier(&macsec_notifier);
4427 rcu_barrier();
4428 }
4429
4430 module_init(macsec_init);
4431 module_exit(macsec_exit);
4432
4433 MODULE_ALIAS_RTNL_LINK("macsec");
4434 MODULE_ALIAS_GENL_FAMILY("macsec");
4435
4436 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
4437 MODULE_LICENSE("GPL v2");
4438