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
free_rx_sc_rcu(struct rcu_head * head)154 static void free_rx_sc_rcu(struct rcu_head *head)
155 {
156 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
157
158 free_percpu(rx_sc->stats);
159 kfree(rx_sc);
160 }
161
macsec_rxsc_get(struct macsec_rx_sc * sc)162 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
163 {
164 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
165 }
166
macsec_rxsc_put(struct macsec_rx_sc * sc)167 static void macsec_rxsc_put(struct macsec_rx_sc *sc)
168 {
169 if (refcount_dec_and_test(&sc->refcnt))
170 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
171 }
172
free_rxsa(struct rcu_head * head)173 static void free_rxsa(struct rcu_head *head)
174 {
175 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
176
177 crypto_free_aead(sa->key.tfm);
178 free_percpu(sa->stats);
179 kfree(sa);
180 }
181
macsec_rxsa_put(struct macsec_rx_sa * sa)182 static void macsec_rxsa_put(struct macsec_rx_sa *sa)
183 {
184 if (refcount_dec_and_test(&sa->refcnt))
185 call_rcu(&sa->rcu, free_rxsa);
186 }
187
macsec_txsa_get(struct macsec_tx_sa __rcu * ptr)188 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
189 {
190 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
191
192 if (!sa || !sa->active)
193 return NULL;
194
195 if (!refcount_inc_not_zero(&sa->refcnt))
196 return NULL;
197
198 return sa;
199 }
200
free_txsa(struct rcu_head * head)201 static void free_txsa(struct rcu_head *head)
202 {
203 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
204
205 crypto_free_aead(sa->key.tfm);
206 free_percpu(sa->stats);
207 kfree(sa);
208 }
209
macsec_txsa_put(struct macsec_tx_sa * sa)210 static void macsec_txsa_put(struct macsec_tx_sa *sa)
211 {
212 if (refcount_dec_and_test(&sa->refcnt))
213 call_rcu(&sa->rcu, free_txsa);
214 }
215
macsec_skb_cb(struct sk_buff * skb)216 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
217 {
218 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
219 return (struct macsec_cb *)skb->cb;
220 }
221
222 #define MACSEC_PORT_SCB (0x0000)
223 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
224 #define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
225
226 #define MACSEC_GCM_AES_128_SAK_LEN 16
227 #define MACSEC_GCM_AES_256_SAK_LEN 32
228
229 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
230 #define DEFAULT_XPN false
231 #define DEFAULT_SEND_SCI true
232 #define DEFAULT_ENCRYPT false
233 #define DEFAULT_ENCODING_SA 0
234 #define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1))
235
make_sci(const u8 * addr,__be16 port)236 static sci_t make_sci(const u8 *addr, __be16 port)
237 {
238 sci_t sci;
239
240 memcpy(&sci, addr, ETH_ALEN);
241 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
242
243 return sci;
244 }
245
macsec_frame_sci(struct macsec_eth_header * hdr,bool sci_present)246 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
247 {
248 sci_t sci;
249
250 if (sci_present)
251 memcpy(&sci, hdr->secure_channel_id,
252 sizeof(hdr->secure_channel_id));
253 else
254 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
255
256 return sci;
257 }
258
macsec_sectag_len(bool sci_present)259 static unsigned int macsec_sectag_len(bool sci_present)
260 {
261 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
262 }
263
macsec_hdr_len(bool sci_present)264 static unsigned int macsec_hdr_len(bool sci_present)
265 {
266 return macsec_sectag_len(sci_present) + ETH_HLEN;
267 }
268
macsec_extra_len(bool sci_present)269 static unsigned int macsec_extra_len(bool sci_present)
270 {
271 return macsec_sectag_len(sci_present) + sizeof(__be16);
272 }
273
274 /* 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)275 static void macsec_fill_sectag(struct macsec_eth_header *h,
276 const struct macsec_secy *secy, u32 pn,
277 bool sci_present)
278 {
279 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
280
281 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
282 h->eth.h_proto = htons(ETH_P_MACSEC);
283
284 if (sci_present) {
285 h->tci_an |= MACSEC_TCI_SC;
286 memcpy(&h->secure_channel_id, &secy->sci,
287 sizeof(h->secure_channel_id));
288 } else {
289 if (tx_sc->end_station)
290 h->tci_an |= MACSEC_TCI_ES;
291 if (tx_sc->scb)
292 h->tci_an |= MACSEC_TCI_SCB;
293 }
294
295 h->packet_number = htonl(pn);
296
297 /* with GCM, C/E clear for !encrypt, both set for encrypt */
298 if (tx_sc->encrypt)
299 h->tci_an |= MACSEC_TCI_CONFID;
300 else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN)
301 h->tci_an |= MACSEC_TCI_C;
302
303 h->tci_an |= tx_sc->encoding_sa;
304 }
305
macsec_set_shortlen(struct macsec_eth_header * h,size_t data_len)306 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
307 {
308 if (data_len < MIN_NON_SHORT_LEN)
309 h->short_length = data_len;
310 }
311
312 /* Checks if a MACsec interface is being offloaded to an hardware engine */
macsec_is_offloaded(struct macsec_dev * macsec)313 static bool macsec_is_offloaded(struct macsec_dev *macsec)
314 {
315 if (macsec->offload == MACSEC_OFFLOAD_MAC ||
316 macsec->offload == MACSEC_OFFLOAD_PHY)
317 return true;
318
319 return false;
320 }
321
322 /* Checks if underlying layers implement MACsec offloading functions. */
macsec_check_offload(enum macsec_offload offload,struct macsec_dev * macsec)323 static bool macsec_check_offload(enum macsec_offload offload,
324 struct macsec_dev *macsec)
325 {
326 if (!macsec || !macsec->real_dev)
327 return false;
328
329 if (offload == MACSEC_OFFLOAD_PHY)
330 return macsec->real_dev->phydev &&
331 macsec->real_dev->phydev->macsec_ops;
332 else if (offload == MACSEC_OFFLOAD_MAC)
333 return macsec->real_dev->features & NETIF_F_HW_MACSEC &&
334 macsec->real_dev->macsec_ops;
335
336 return false;
337 }
338
__macsec_get_ops(enum macsec_offload offload,struct macsec_dev * macsec,struct macsec_context * ctx)339 static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload,
340 struct macsec_dev *macsec,
341 struct macsec_context *ctx)
342 {
343 if (ctx) {
344 memset(ctx, 0, sizeof(*ctx));
345 ctx->offload = offload;
346
347 if (offload == MACSEC_OFFLOAD_PHY)
348 ctx->phydev = macsec->real_dev->phydev;
349 else if (offload == MACSEC_OFFLOAD_MAC)
350 ctx->netdev = macsec->real_dev;
351 }
352
353 if (offload == MACSEC_OFFLOAD_PHY)
354 return macsec->real_dev->phydev->macsec_ops;
355 else
356 return macsec->real_dev->macsec_ops;
357 }
358
359 /* Returns a pointer to the MACsec ops struct if any and updates the MACsec
360 * context device reference if provided.
361 */
macsec_get_ops(struct macsec_dev * macsec,struct macsec_context * ctx)362 static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
363 struct macsec_context *ctx)
364 {
365 if (!macsec_check_offload(macsec->offload, macsec))
366 return NULL;
367
368 return __macsec_get_ops(macsec->offload, macsec, ctx);
369 }
370
371 /* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */
macsec_validate_skb(struct sk_buff * skb,u16 icv_len,bool xpn)372 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn)
373 {
374 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
375 int len = skb->len - 2 * ETH_ALEN;
376 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
377
378 /* a) It comprises at least 17 octets */
379 if (skb->len <= 16)
380 return false;
381
382 /* b) MACsec EtherType: already checked */
383
384 /* c) V bit is clear */
385 if (h->tci_an & MACSEC_TCI_VERSION)
386 return false;
387
388 /* d) ES or SCB => !SC */
389 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
390 (h->tci_an & MACSEC_TCI_SC))
391 return false;
392
393 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
394 if (h->unused)
395 return false;
396
397 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */
398 if (!h->packet_number && !xpn)
399 return false;
400
401 /* length check, f) g) h) i) */
402 if (h->short_length)
403 return len == extra_len + h->short_length;
404 return len >= extra_len + MIN_NON_SHORT_LEN;
405 }
406
407 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
408 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
409
macsec_fill_iv_xpn(unsigned char * iv,ssci_t ssci,u64 pn,salt_t salt)410 static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn,
411 salt_t salt)
412 {
413 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv;
414
415 gcm_iv->ssci = ssci ^ salt.ssci;
416 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn;
417 }
418
macsec_fill_iv(unsigned char * iv,sci_t sci,u32 pn)419 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
420 {
421 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
422
423 gcm_iv->sci = sci;
424 gcm_iv->pn = htonl(pn);
425 }
426
macsec_ethhdr(struct sk_buff * skb)427 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
428 {
429 return (struct macsec_eth_header *)skb_mac_header(skb);
430 }
431
__macsec_pn_wrapped(struct macsec_secy * secy,struct macsec_tx_sa * tx_sa)432 static void __macsec_pn_wrapped(struct macsec_secy *secy,
433 struct macsec_tx_sa *tx_sa)
434 {
435 pr_debug("PN wrapped, transitioning to !oper\n");
436 tx_sa->active = false;
437 if (secy->protect_frames)
438 secy->operational = false;
439 }
440
macsec_pn_wrapped(struct macsec_secy * secy,struct macsec_tx_sa * tx_sa)441 void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
442 {
443 spin_lock_bh(&tx_sa->lock);
444 __macsec_pn_wrapped(secy, tx_sa);
445 spin_unlock_bh(&tx_sa->lock);
446 }
447 EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
448
tx_sa_update_pn(struct macsec_tx_sa * tx_sa,struct macsec_secy * secy)449 static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
450 struct macsec_secy *secy)
451 {
452 pn_t pn;
453
454 spin_lock_bh(&tx_sa->lock);
455
456 pn = tx_sa->next_pn_halves;
457 if (secy->xpn)
458 tx_sa->next_pn++;
459 else
460 tx_sa->next_pn_halves.lower++;
461
462 if (tx_sa->next_pn == 0)
463 __macsec_pn_wrapped(secy, tx_sa);
464 spin_unlock_bh(&tx_sa->lock);
465
466 return pn;
467 }
468
macsec_encrypt_finish(struct sk_buff * skb,struct net_device * dev)469 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
470 {
471 struct macsec_dev *macsec = netdev_priv(dev);
472
473 skb->dev = macsec->real_dev;
474 skb_reset_mac_header(skb);
475 skb->protocol = eth_hdr(skb)->h_proto;
476 }
477
macsec_msdu_len(struct sk_buff * skb)478 static unsigned int macsec_msdu_len(struct sk_buff *skb)
479 {
480 struct macsec_dev *macsec = macsec_priv(skb->dev);
481 struct macsec_secy *secy = &macsec->secy;
482 bool sci_present = macsec_skb_cb(skb)->has_sci;
483
484 return skb->len - macsec_hdr_len(sci_present) - secy->icv_len;
485 }
486
macsec_count_tx(struct sk_buff * skb,struct macsec_tx_sc * tx_sc,struct macsec_tx_sa * tx_sa)487 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
488 struct macsec_tx_sa *tx_sa)
489 {
490 unsigned int msdu_len = macsec_msdu_len(skb);
491 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
492
493 u64_stats_update_begin(&txsc_stats->syncp);
494 if (tx_sc->encrypt) {
495 txsc_stats->stats.OutOctetsEncrypted += msdu_len;
496 txsc_stats->stats.OutPktsEncrypted++;
497 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
498 } else {
499 txsc_stats->stats.OutOctetsProtected += msdu_len;
500 txsc_stats->stats.OutPktsProtected++;
501 this_cpu_inc(tx_sa->stats->OutPktsProtected);
502 }
503 u64_stats_update_end(&txsc_stats->syncp);
504 }
505
count_tx(struct net_device * dev,int ret,int len)506 static void count_tx(struct net_device *dev, int ret, int len)
507 {
508 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN))
509 dev_sw_netstats_tx_add(dev, 1, len);
510 }
511
macsec_encrypt_done(void * data,int err)512 static void macsec_encrypt_done(void *data, int err)
513 {
514 struct sk_buff *skb = data;
515 struct net_device *dev = skb->dev;
516 struct macsec_dev *macsec = macsec_priv(dev);
517 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
518 int len, ret;
519
520 aead_request_free(macsec_skb_cb(skb)->req);
521
522 rcu_read_lock_bh();
523 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
524 /* packet is encrypted/protected so tx_bytes must be calculated */
525 len = macsec_msdu_len(skb) + 2 * ETH_ALEN;
526 macsec_encrypt_finish(skb, dev);
527 ret = dev_queue_xmit(skb);
528 count_tx(dev, ret, len);
529 rcu_read_unlock_bh();
530
531 macsec_txsa_put(sa);
532 dev_put(dev);
533 }
534
macsec_alloc_req(struct crypto_aead * tfm,unsigned char ** iv,struct scatterlist ** sg,int num_frags)535 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
536 unsigned char **iv,
537 struct scatterlist **sg,
538 int num_frags)
539 {
540 size_t size, iv_offset, sg_offset;
541 struct aead_request *req;
542 void *tmp;
543
544 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
545 iv_offset = size;
546 size += GCM_AES_IV_LEN;
547
548 size = ALIGN(size, __alignof__(struct scatterlist));
549 sg_offset = size;
550 size += sizeof(struct scatterlist) * num_frags;
551
552 tmp = kmalloc(size, GFP_ATOMIC);
553 if (!tmp)
554 return NULL;
555
556 *iv = (unsigned char *)(tmp + iv_offset);
557 *sg = (struct scatterlist *)(tmp + sg_offset);
558 req = tmp;
559
560 aead_request_set_tfm(req, tfm);
561
562 return req;
563 }
564
macsec_encrypt(struct sk_buff * skb,struct net_device * dev)565 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
566 struct net_device *dev)
567 {
568 int ret;
569 struct scatterlist *sg;
570 struct sk_buff *trailer;
571 unsigned char *iv;
572 struct ethhdr *eth;
573 struct macsec_eth_header *hh;
574 size_t unprotected_len;
575 struct aead_request *req;
576 struct macsec_secy *secy;
577 struct macsec_tx_sc *tx_sc;
578 struct macsec_tx_sa *tx_sa;
579 struct macsec_dev *macsec = macsec_priv(dev);
580 bool sci_present;
581 pn_t pn;
582
583 secy = &macsec->secy;
584 tx_sc = &secy->tx_sc;
585
586 /* 10.5.1 TX SA assignment */
587 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
588 if (!tx_sa) {
589 secy->operational = false;
590 kfree_skb(skb);
591 return ERR_PTR(-EINVAL);
592 }
593
594 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
595 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
596 struct sk_buff *nskb = skb_copy_expand(skb,
597 MACSEC_NEEDED_HEADROOM,
598 MACSEC_NEEDED_TAILROOM,
599 GFP_ATOMIC);
600 if (likely(nskb)) {
601 consume_skb(skb);
602 skb = nskb;
603 } else {
604 macsec_txsa_put(tx_sa);
605 kfree_skb(skb);
606 return ERR_PTR(-ENOMEM);
607 }
608 } else {
609 skb = skb_unshare(skb, GFP_ATOMIC);
610 if (!skb) {
611 macsec_txsa_put(tx_sa);
612 return ERR_PTR(-ENOMEM);
613 }
614 }
615
616 unprotected_len = skb->len;
617 eth = eth_hdr(skb);
618 sci_present = macsec_send_sci(secy);
619 hh = skb_push(skb, macsec_extra_len(sci_present));
620 memmove(hh, eth, 2 * ETH_ALEN);
621
622 pn = tx_sa_update_pn(tx_sa, secy);
623 if (pn.full64 == 0) {
624 macsec_txsa_put(tx_sa);
625 kfree_skb(skb);
626 return ERR_PTR(-ENOLINK);
627 }
628 macsec_fill_sectag(hh, secy, pn.lower, sci_present);
629 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
630
631 skb_put(skb, secy->icv_len);
632
633 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
634 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
635
636 u64_stats_update_begin(&secy_stats->syncp);
637 secy_stats->stats.OutPktsTooLong++;
638 u64_stats_update_end(&secy_stats->syncp);
639
640 macsec_txsa_put(tx_sa);
641 kfree_skb(skb);
642 return ERR_PTR(-EINVAL);
643 }
644
645 ret = skb_cow_data(skb, 0, &trailer);
646 if (unlikely(ret < 0)) {
647 macsec_txsa_put(tx_sa);
648 kfree_skb(skb);
649 return ERR_PTR(ret);
650 }
651
652 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
653 if (!req) {
654 macsec_txsa_put(tx_sa);
655 kfree_skb(skb);
656 return ERR_PTR(-ENOMEM);
657 }
658
659 if (secy->xpn)
660 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt);
661 else
662 macsec_fill_iv(iv, secy->sci, pn.lower);
663
664 sg_init_table(sg, ret);
665 ret = skb_to_sgvec(skb, sg, 0, skb->len);
666 if (unlikely(ret < 0)) {
667 aead_request_free(req);
668 macsec_txsa_put(tx_sa);
669 kfree_skb(skb);
670 return ERR_PTR(ret);
671 }
672
673 if (tx_sc->encrypt) {
674 int len = skb->len - macsec_hdr_len(sci_present) -
675 secy->icv_len;
676 aead_request_set_crypt(req, sg, sg, len, iv);
677 aead_request_set_ad(req, macsec_hdr_len(sci_present));
678 } else {
679 aead_request_set_crypt(req, sg, sg, 0, iv);
680 aead_request_set_ad(req, skb->len - secy->icv_len);
681 }
682
683 macsec_skb_cb(skb)->req = req;
684 macsec_skb_cb(skb)->tx_sa = tx_sa;
685 macsec_skb_cb(skb)->has_sci = sci_present;
686 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
687
688 dev_hold(skb->dev);
689 ret = crypto_aead_encrypt(req);
690 if (ret == -EINPROGRESS) {
691 return ERR_PTR(ret);
692 } else if (ret != 0) {
693 dev_put(skb->dev);
694 kfree_skb(skb);
695 aead_request_free(req);
696 macsec_txsa_put(tx_sa);
697 return ERR_PTR(-EINVAL);
698 }
699
700 dev_put(skb->dev);
701 aead_request_free(req);
702 macsec_txsa_put(tx_sa);
703
704 return skb;
705 }
706
macsec_post_decrypt(struct sk_buff * skb,struct macsec_secy * secy,u32 pn)707 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
708 {
709 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
710 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
711 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
712 u32 lowest_pn = 0;
713
714 spin_lock(&rx_sa->lock);
715 if (rx_sa->next_pn_halves.lower >= secy->replay_window)
716 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
717
718 /* Now perform replay protection check again
719 * (see IEEE 802.1AE-2006 figure 10-5)
720 */
721 if (secy->replay_protect && pn < lowest_pn &&
722 (!secy->xpn || pn_same_half(pn, lowest_pn))) {
723 spin_unlock(&rx_sa->lock);
724 u64_stats_update_begin(&rxsc_stats->syncp);
725 rxsc_stats->stats.InPktsLate++;
726 u64_stats_update_end(&rxsc_stats->syncp);
727 DEV_STATS_INC(secy->netdev, rx_dropped);
728 return false;
729 }
730
731 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
732 unsigned int msdu_len = macsec_msdu_len(skb);
733 u64_stats_update_begin(&rxsc_stats->syncp);
734 if (hdr->tci_an & MACSEC_TCI_E)
735 rxsc_stats->stats.InOctetsDecrypted += msdu_len;
736 else
737 rxsc_stats->stats.InOctetsValidated += msdu_len;
738 u64_stats_update_end(&rxsc_stats->syncp);
739 }
740
741 if (!macsec_skb_cb(skb)->valid) {
742 spin_unlock(&rx_sa->lock);
743
744 /* 10.6.5 */
745 if (hdr->tci_an & MACSEC_TCI_C ||
746 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
747 u64_stats_update_begin(&rxsc_stats->syncp);
748 rxsc_stats->stats.InPktsNotValid++;
749 u64_stats_update_end(&rxsc_stats->syncp);
750 this_cpu_inc(rx_sa->stats->InPktsNotValid);
751 DEV_STATS_INC(secy->netdev, rx_errors);
752 return false;
753 }
754
755 u64_stats_update_begin(&rxsc_stats->syncp);
756 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
757 rxsc_stats->stats.InPktsInvalid++;
758 this_cpu_inc(rx_sa->stats->InPktsInvalid);
759 } else if (pn < lowest_pn) {
760 rxsc_stats->stats.InPktsDelayed++;
761 } else {
762 rxsc_stats->stats.InPktsUnchecked++;
763 }
764 u64_stats_update_end(&rxsc_stats->syncp);
765 } else {
766 u64_stats_update_begin(&rxsc_stats->syncp);
767 if (pn < lowest_pn) {
768 rxsc_stats->stats.InPktsDelayed++;
769 } else {
770 rxsc_stats->stats.InPktsOK++;
771 this_cpu_inc(rx_sa->stats->InPktsOK);
772 }
773 u64_stats_update_end(&rxsc_stats->syncp);
774
775 // Instead of "pn >=" - to support pn overflow in xpn
776 if (pn + 1 > rx_sa->next_pn_halves.lower) {
777 rx_sa->next_pn_halves.lower = pn + 1;
778 } else if (secy->xpn &&
779 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
780 rx_sa->next_pn_halves.upper++;
781 rx_sa->next_pn_halves.lower = pn + 1;
782 }
783
784 spin_unlock(&rx_sa->lock);
785 }
786
787 return true;
788 }
789
macsec_reset_skb(struct sk_buff * skb,struct net_device * dev)790 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
791 {
792 skb->pkt_type = PACKET_HOST;
793 skb->protocol = eth_type_trans(skb, dev);
794
795 skb_reset_network_header(skb);
796 if (!skb_transport_header_was_set(skb))
797 skb_reset_transport_header(skb);
798 skb_reset_mac_len(skb);
799 }
800
macsec_finalize_skb(struct sk_buff * skb,u8 icv_len,u8 hdr_len)801 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
802 {
803 skb->ip_summed = CHECKSUM_NONE;
804 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
805 skb_pull(skb, hdr_len);
806 pskb_trim_unique(skb, skb->len - icv_len);
807 }
808
count_rx(struct net_device * dev,int len)809 static void count_rx(struct net_device *dev, int len)
810 {
811 dev_sw_netstats_rx_add(dev, len);
812 }
813
macsec_decrypt_done(void * data,int err)814 static void macsec_decrypt_done(void *data, int err)
815 {
816 struct sk_buff *skb = data;
817 struct net_device *dev = skb->dev;
818 struct macsec_dev *macsec = macsec_priv(dev);
819 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
820 struct macsec_rx_sc *rx_sc = rx_sa->sc;
821 int len;
822 u32 pn;
823
824 aead_request_free(macsec_skb_cb(skb)->req);
825
826 if (!err)
827 macsec_skb_cb(skb)->valid = true;
828
829 rcu_read_lock_bh();
830 pn = ntohl(macsec_ethhdr(skb)->packet_number);
831 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
832 rcu_read_unlock_bh();
833 kfree_skb(skb);
834 goto out;
835 }
836
837 macsec_finalize_skb(skb, macsec->secy.icv_len,
838 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
839 len = skb->len;
840 macsec_reset_skb(skb, macsec->secy.netdev);
841
842 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
843 count_rx(dev, len);
844
845 rcu_read_unlock_bh();
846
847 out:
848 macsec_rxsa_put(rx_sa);
849 macsec_rxsc_put(rx_sc);
850 dev_put(dev);
851 }
852
macsec_decrypt(struct sk_buff * skb,struct net_device * dev,struct macsec_rx_sa * rx_sa,sci_t sci,struct macsec_secy * secy)853 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
854 struct net_device *dev,
855 struct macsec_rx_sa *rx_sa,
856 sci_t sci,
857 struct macsec_secy *secy)
858 {
859 int ret;
860 struct scatterlist *sg;
861 struct sk_buff *trailer;
862 unsigned char *iv;
863 struct aead_request *req;
864 struct macsec_eth_header *hdr;
865 u32 hdr_pn;
866 u16 icv_len = secy->icv_len;
867
868 macsec_skb_cb(skb)->valid = false;
869 skb = skb_share_check(skb, GFP_ATOMIC);
870 if (!skb)
871 return ERR_PTR(-ENOMEM);
872
873 ret = skb_cow_data(skb, 0, &trailer);
874 if (unlikely(ret < 0)) {
875 kfree_skb(skb);
876 return ERR_PTR(ret);
877 }
878 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
879 if (!req) {
880 kfree_skb(skb);
881 return ERR_PTR(-ENOMEM);
882 }
883
884 hdr = (struct macsec_eth_header *)skb->data;
885 hdr_pn = ntohl(hdr->packet_number);
886
887 if (secy->xpn) {
888 pn_t recovered_pn = rx_sa->next_pn_halves;
889
890 recovered_pn.lower = hdr_pn;
891 if (hdr_pn < rx_sa->next_pn_halves.lower &&
892 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
893 recovered_pn.upper++;
894
895 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
896 rx_sa->key.salt);
897 } else {
898 macsec_fill_iv(iv, sci, hdr_pn);
899 }
900
901 sg_init_table(sg, ret);
902 ret = skb_to_sgvec(skb, sg, 0, skb->len);
903 if (unlikely(ret < 0)) {
904 aead_request_free(req);
905 kfree_skb(skb);
906 return ERR_PTR(ret);
907 }
908
909 if (hdr->tci_an & MACSEC_TCI_E) {
910 /* confidentiality: ethernet + macsec header
911 * authenticated, encrypted payload
912 */
913 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
914
915 aead_request_set_crypt(req, sg, sg, len, iv);
916 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
917 skb = skb_unshare(skb, GFP_ATOMIC);
918 if (!skb) {
919 aead_request_free(req);
920 return ERR_PTR(-ENOMEM);
921 }
922 } else {
923 /* integrity only: all headers + data authenticated */
924 aead_request_set_crypt(req, sg, sg, icv_len, iv);
925 aead_request_set_ad(req, skb->len - icv_len);
926 }
927
928 macsec_skb_cb(skb)->req = req;
929 skb->dev = dev;
930 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
931
932 dev_hold(dev);
933 ret = crypto_aead_decrypt(req);
934 if (ret == -EINPROGRESS) {
935 return ERR_PTR(ret);
936 } else if (ret != 0) {
937 /* decryption/authentication failed
938 * 10.6 if validateFrames is disabled, deliver anyway
939 */
940 if (ret != -EBADMSG) {
941 kfree_skb(skb);
942 skb = ERR_PTR(ret);
943 }
944 } else {
945 macsec_skb_cb(skb)->valid = true;
946 }
947 dev_put(dev);
948
949 aead_request_free(req);
950
951 return skb;
952 }
953
find_rx_sc(struct macsec_secy * secy,sci_t sci)954 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
955 {
956 struct macsec_rx_sc *rx_sc;
957
958 for_each_rxsc(secy, rx_sc) {
959 if (rx_sc->sci == sci)
960 return rx_sc;
961 }
962
963 return NULL;
964 }
965
find_rx_sc_rtnl(struct macsec_secy * secy,sci_t sci)966 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
967 {
968 struct macsec_rx_sc *rx_sc;
969
970 for_each_rxsc_rtnl(secy, rx_sc) {
971 if (rx_sc->sci == sci)
972 return rx_sc;
973 }
974
975 return NULL;
976 }
977
handle_not_macsec(struct sk_buff * skb)978 static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
979 {
980 /* Deliver to the uncontrolled port by default */
981 enum rx_handler_result ret = RX_HANDLER_PASS;
982 struct ethhdr *hdr = eth_hdr(skb);
983 struct metadata_dst *md_dst;
984 struct macsec_rxh_data *rxd;
985 struct macsec_dev *macsec;
986 bool is_macsec_md_dst;
987
988 rcu_read_lock();
989 rxd = macsec_data_rcu(skb->dev);
990 md_dst = skb_metadata_dst(skb);
991 is_macsec_md_dst = md_dst && md_dst->type == METADATA_MACSEC;
992
993 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
994 struct sk_buff *nskb;
995 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
996 struct net_device *ndev = macsec->secy.netdev;
997
998 /* If h/w offloading is enabled, HW decodes frames and strips
999 * the SecTAG, so we have to deduce which port to deliver to.
1000 */
1001 if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
1002 const struct macsec_ops *ops;
1003
1004 ops = macsec_get_ops(macsec, NULL);
1005
1006 if (ops->rx_uses_md_dst && !is_macsec_md_dst)
1007 continue;
1008
1009 if (is_macsec_md_dst) {
1010 struct macsec_rx_sc *rx_sc;
1011
1012 /* All drivers that implement MACsec offload
1013 * support using skb metadata destinations must
1014 * indicate that they do so.
1015 */
1016 DEBUG_NET_WARN_ON_ONCE(!ops->rx_uses_md_dst);
1017 rx_sc = find_rx_sc(&macsec->secy,
1018 md_dst->u.macsec_info.sci);
1019 if (!rx_sc)
1020 continue;
1021 /* device indicated macsec offload occurred */
1022 skb->dev = ndev;
1023 skb->pkt_type = PACKET_HOST;
1024 eth_skb_pkt_type(skb, ndev);
1025 ret = RX_HANDLER_ANOTHER;
1026 goto out;
1027 }
1028
1029 /* This datapath is insecure because it is unable to
1030 * enforce isolation of broadcast/multicast traffic and
1031 * unicast traffic with promiscuous mode on the macsec
1032 * netdev. Since the core stack has no mechanism to
1033 * check that the hardware did indeed receive MACsec
1034 * traffic, it is possible that the response handling
1035 * done by the MACsec port was to a plaintext packet.
1036 * This violates the MACsec protocol standard.
1037 */
1038 if (ether_addr_equal_64bits(hdr->h_dest,
1039 ndev->dev_addr)) {
1040 /* exact match, divert skb to this port */
1041 skb->dev = ndev;
1042 skb->pkt_type = PACKET_HOST;
1043 ret = RX_HANDLER_ANOTHER;
1044 goto out;
1045 } else if (is_multicast_ether_addr_64bits(
1046 hdr->h_dest)) {
1047 /* multicast frame, deliver on this port too */
1048 nskb = skb_clone(skb, GFP_ATOMIC);
1049 if (!nskb)
1050 break;
1051
1052 nskb->dev = ndev;
1053 eth_skb_pkt_type(nskb, ndev);
1054
1055 __netif_rx(nskb);
1056 } else if (ndev->flags & IFF_PROMISC) {
1057 skb->dev = ndev;
1058 skb->pkt_type = PACKET_HOST;
1059 ret = RX_HANDLER_ANOTHER;
1060 goto out;
1061 }
1062
1063 continue;
1064 }
1065
1066 /* 10.6 If the management control validateFrames is not
1067 * Strict, frames without a SecTAG are received, counted, and
1068 * delivered to the Controlled Port
1069 */
1070 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1071 u64_stats_update_begin(&secy_stats->syncp);
1072 secy_stats->stats.InPktsNoTag++;
1073 u64_stats_update_end(&secy_stats->syncp);
1074 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1075 continue;
1076 }
1077
1078 /* deliver on this port */
1079 nskb = skb_clone(skb, GFP_ATOMIC);
1080 if (!nskb)
1081 break;
1082
1083 nskb->dev = ndev;
1084
1085 if (__netif_rx(nskb) == NET_RX_SUCCESS) {
1086 u64_stats_update_begin(&secy_stats->syncp);
1087 secy_stats->stats.InPktsUntagged++;
1088 u64_stats_update_end(&secy_stats->syncp);
1089 }
1090 }
1091
1092 out:
1093 rcu_read_unlock();
1094 return ret;
1095 }
1096
macsec_handle_frame(struct sk_buff ** pskb)1097 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1098 {
1099 struct sk_buff *skb = *pskb;
1100 struct net_device *dev = skb->dev;
1101 struct macsec_eth_header *hdr;
1102 struct macsec_secy *secy = NULL;
1103 struct macsec_rx_sc *rx_sc;
1104 struct macsec_rx_sa *rx_sa;
1105 struct macsec_rxh_data *rxd;
1106 struct macsec_dev *macsec;
1107 unsigned int len;
1108 sci_t sci;
1109 u32 hdr_pn;
1110 bool cbit;
1111 struct pcpu_rx_sc_stats *rxsc_stats;
1112 struct pcpu_secy_stats *secy_stats;
1113 bool pulled_sci;
1114 int ret;
1115
1116 if (skb_headroom(skb) < ETH_HLEN)
1117 goto drop_direct;
1118
1119 hdr = macsec_ethhdr(skb);
1120 if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
1121 return handle_not_macsec(skb);
1122
1123 skb = skb_unshare(skb, GFP_ATOMIC);
1124 *pskb = skb;
1125 if (!skb)
1126 return RX_HANDLER_CONSUMED;
1127
1128 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1129 if (!pulled_sci) {
1130 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1131 goto drop_direct;
1132 }
1133
1134 hdr = macsec_ethhdr(skb);
1135
1136 /* Frames with a SecTAG that has the TCI E bit set but the C
1137 * bit clear are discarded, as this reserved encoding is used
1138 * to identify frames with a SecTAG that are not to be
1139 * delivered to the Controlled Port.
1140 */
1141 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1142 return RX_HANDLER_PASS;
1143
1144 /* now, pull the extra length */
1145 if (hdr->tci_an & MACSEC_TCI_SC) {
1146 if (!pulled_sci)
1147 goto drop_direct;
1148 }
1149
1150 /* ethernet header is part of crypto processing */
1151 skb_push(skb, ETH_HLEN);
1152
1153 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1154 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1155 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1156
1157 rcu_read_lock();
1158 rxd = macsec_data_rcu(skb->dev);
1159
1160 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1161 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1162
1163 sc = sc ? macsec_rxsc_get(sc) : NULL;
1164
1165 if (sc) {
1166 secy = &macsec->secy;
1167 rx_sc = sc;
1168 break;
1169 }
1170 }
1171
1172 if (!secy)
1173 goto nosci;
1174
1175 dev = secy->netdev;
1176 macsec = macsec_priv(dev);
1177 secy_stats = this_cpu_ptr(macsec->stats);
1178 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1179
1180 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
1181 u64_stats_update_begin(&secy_stats->syncp);
1182 secy_stats->stats.InPktsBadTag++;
1183 u64_stats_update_end(&secy_stats->syncp);
1184 DEV_STATS_INC(secy->netdev, rx_errors);
1185 goto drop_nosa;
1186 }
1187
1188 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1189 if (!rx_sa) {
1190 /* 10.6.1 if the SA is not in use */
1191
1192 /* If validateFrames is Strict or the C bit in the
1193 * SecTAG is set, discard
1194 */
1195 if (hdr->tci_an & MACSEC_TCI_C ||
1196 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1197 u64_stats_update_begin(&rxsc_stats->syncp);
1198 rxsc_stats->stats.InPktsNotUsingSA++;
1199 u64_stats_update_end(&rxsc_stats->syncp);
1200 DEV_STATS_INC(secy->netdev, rx_errors);
1201 goto drop_nosa;
1202 }
1203
1204 /* not Strict, the frame (with the SecTAG and ICV
1205 * removed) is delivered to the Controlled Port.
1206 */
1207 u64_stats_update_begin(&rxsc_stats->syncp);
1208 rxsc_stats->stats.InPktsUnusedSA++;
1209 u64_stats_update_end(&rxsc_stats->syncp);
1210 goto deliver;
1211 }
1212
1213 /* First, PN check to avoid decrypting obviously wrong packets */
1214 hdr_pn = ntohl(hdr->packet_number);
1215 if (secy->replay_protect) {
1216 bool late;
1217
1218 spin_lock(&rx_sa->lock);
1219 late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
1220 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
1221
1222 if (secy->xpn)
1223 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
1224 spin_unlock(&rx_sa->lock);
1225
1226 if (late) {
1227 u64_stats_update_begin(&rxsc_stats->syncp);
1228 rxsc_stats->stats.InPktsLate++;
1229 u64_stats_update_end(&rxsc_stats->syncp);
1230 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1231 goto drop;
1232 }
1233 }
1234
1235 macsec_skb_cb(skb)->rx_sa = rx_sa;
1236
1237 /* Disabled && !changed text => skip validation */
1238 if (hdr->tci_an & MACSEC_TCI_C ||
1239 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1240 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1241
1242 if (IS_ERR(skb)) {
1243 /* the decrypt callback needs the reference */
1244 if (PTR_ERR(skb) != -EINPROGRESS) {
1245 macsec_rxsa_put(rx_sa);
1246 macsec_rxsc_put(rx_sc);
1247 }
1248 rcu_read_unlock();
1249 *pskb = NULL;
1250 return RX_HANDLER_CONSUMED;
1251 }
1252
1253 if (!macsec_post_decrypt(skb, secy, hdr_pn))
1254 goto drop;
1255
1256 deliver:
1257 macsec_finalize_skb(skb, secy->icv_len,
1258 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1259 len = skb->len;
1260 macsec_reset_skb(skb, secy->netdev);
1261
1262 if (rx_sa)
1263 macsec_rxsa_put(rx_sa);
1264 macsec_rxsc_put(rx_sc);
1265
1266 skb_orphan(skb);
1267 ret = gro_cells_receive(&macsec->gro_cells, skb);
1268 if (ret == NET_RX_SUCCESS)
1269 count_rx(dev, len);
1270 else
1271 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1272
1273 rcu_read_unlock();
1274
1275 *pskb = NULL;
1276 return RX_HANDLER_CONSUMED;
1277
1278 drop:
1279 macsec_rxsa_put(rx_sa);
1280 drop_nosa:
1281 macsec_rxsc_put(rx_sc);
1282 rcu_read_unlock();
1283 drop_direct:
1284 kfree_skb(skb);
1285 *pskb = NULL;
1286 return RX_HANDLER_CONSUMED;
1287
1288 nosci:
1289 /* 10.6.1 if the SC is not found */
1290 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1291 if (!cbit)
1292 macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN,
1293 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1294
1295 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1296 struct sk_buff *nskb;
1297
1298 secy_stats = this_cpu_ptr(macsec->stats);
1299
1300 /* If validateFrames is Strict or the C bit in the
1301 * SecTAG is set, discard
1302 */
1303 if (cbit ||
1304 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1305 u64_stats_update_begin(&secy_stats->syncp);
1306 secy_stats->stats.InPktsNoSCI++;
1307 u64_stats_update_end(&secy_stats->syncp);
1308 DEV_STATS_INC(macsec->secy.netdev, rx_errors);
1309 continue;
1310 }
1311
1312 /* not strict, the frame (with the SecTAG and ICV
1313 * removed) is delivered to the Controlled Port.
1314 */
1315 nskb = skb_clone(skb, GFP_ATOMIC);
1316 if (!nskb)
1317 break;
1318
1319 macsec_reset_skb(nskb, macsec->secy.netdev);
1320
1321 ret = __netif_rx(nskb);
1322 if (ret == NET_RX_SUCCESS) {
1323 u64_stats_update_begin(&secy_stats->syncp);
1324 secy_stats->stats.InPktsUnknownSCI++;
1325 u64_stats_update_end(&secy_stats->syncp);
1326 } else {
1327 DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
1328 }
1329 }
1330
1331 rcu_read_unlock();
1332 *pskb = skb;
1333 return RX_HANDLER_PASS;
1334 }
1335
macsec_alloc_tfm(char * key,int key_len,int icv_len)1336 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1337 {
1338 struct crypto_aead *tfm;
1339 int ret;
1340
1341 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1342
1343 if (IS_ERR(tfm))
1344 return tfm;
1345
1346 ret = crypto_aead_setkey(tfm, key, key_len);
1347 if (ret < 0)
1348 goto fail;
1349
1350 ret = crypto_aead_setauthsize(tfm, icv_len);
1351 if (ret < 0)
1352 goto fail;
1353
1354 return tfm;
1355 fail:
1356 crypto_free_aead(tfm);
1357 return ERR_PTR(ret);
1358 }
1359
init_rx_sa(struct macsec_rx_sa * rx_sa,char * sak,int key_len,int icv_len)1360 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1361 int icv_len)
1362 {
1363 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1364 if (!rx_sa->stats)
1365 return -ENOMEM;
1366
1367 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1368 if (IS_ERR(rx_sa->key.tfm)) {
1369 free_percpu(rx_sa->stats);
1370 return PTR_ERR(rx_sa->key.tfm);
1371 }
1372
1373 rx_sa->ssci = MACSEC_UNDEF_SSCI;
1374 rx_sa->active = false;
1375 rx_sa->next_pn = 1;
1376 refcount_set(&rx_sa->refcnt, 1);
1377 spin_lock_init(&rx_sa->lock);
1378
1379 return 0;
1380 }
1381
clear_rx_sa(struct macsec_rx_sa * rx_sa)1382 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1383 {
1384 rx_sa->active = false;
1385
1386 macsec_rxsa_put(rx_sa);
1387 }
1388
free_rx_sc(struct macsec_rx_sc * rx_sc)1389 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1390 {
1391 int i;
1392
1393 for (i = 0; i < MACSEC_NUM_AN; i++) {
1394 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1395
1396 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1397 if (sa)
1398 clear_rx_sa(sa);
1399 }
1400
1401 macsec_rxsc_put(rx_sc);
1402 }
1403
del_rx_sc(struct macsec_secy * secy,sci_t sci)1404 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1405 {
1406 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1407
1408 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1409 rx_sc;
1410 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1411 if (rx_sc->sci == sci) {
1412 if (rx_sc->active)
1413 secy->n_rx_sc--;
1414 rcu_assign_pointer(*rx_scp, rx_sc->next);
1415 return rx_sc;
1416 }
1417 }
1418
1419 return NULL;
1420 }
1421
create_rx_sc(struct net_device * dev,sci_t sci,bool active)1422 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci,
1423 bool active)
1424 {
1425 struct macsec_rx_sc *rx_sc;
1426 struct macsec_dev *macsec;
1427 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1428 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1429 struct macsec_secy *secy;
1430
1431 list_for_each_entry(macsec, &rxd->secys, secys) {
1432 if (find_rx_sc_rtnl(&macsec->secy, sci))
1433 return ERR_PTR(-EEXIST);
1434 }
1435
1436 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1437 if (!rx_sc)
1438 return ERR_PTR(-ENOMEM);
1439
1440 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1441 if (!rx_sc->stats) {
1442 kfree(rx_sc);
1443 return ERR_PTR(-ENOMEM);
1444 }
1445
1446 rx_sc->sci = sci;
1447 rx_sc->active = active;
1448 refcount_set(&rx_sc->refcnt, 1);
1449
1450 secy = &macsec_priv(dev)->secy;
1451 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1452 rcu_assign_pointer(secy->rx_sc, rx_sc);
1453
1454 if (rx_sc->active)
1455 secy->n_rx_sc++;
1456
1457 return rx_sc;
1458 }
1459
init_tx_sa(struct macsec_tx_sa * tx_sa,char * sak,int key_len,int icv_len)1460 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1461 int icv_len)
1462 {
1463 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1464 if (!tx_sa->stats)
1465 return -ENOMEM;
1466
1467 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1468 if (IS_ERR(tx_sa->key.tfm)) {
1469 free_percpu(tx_sa->stats);
1470 return PTR_ERR(tx_sa->key.tfm);
1471 }
1472
1473 tx_sa->ssci = MACSEC_UNDEF_SSCI;
1474 tx_sa->active = false;
1475 refcount_set(&tx_sa->refcnt, 1);
1476 spin_lock_init(&tx_sa->lock);
1477
1478 return 0;
1479 }
1480
clear_tx_sa(struct macsec_tx_sa * tx_sa)1481 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1482 {
1483 tx_sa->active = false;
1484
1485 macsec_txsa_put(tx_sa);
1486 }
1487
1488 static struct genl_family macsec_fam;
1489
get_dev_from_nl(struct net * net,struct nlattr ** attrs)1490 static struct net_device *get_dev_from_nl(struct net *net,
1491 struct nlattr **attrs)
1492 {
1493 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1494 struct net_device *dev;
1495
1496 dev = __dev_get_by_index(net, ifindex);
1497 if (!dev)
1498 return ERR_PTR(-ENODEV);
1499
1500 if (!netif_is_macsec(dev))
1501 return ERR_PTR(-ENODEV);
1502
1503 return dev;
1504 }
1505
nla_get_offload(const struct nlattr * nla)1506 static enum macsec_offload nla_get_offload(const struct nlattr *nla)
1507 {
1508 return (__force enum macsec_offload)nla_get_u8(nla);
1509 }
1510
nla_get_sci(const struct nlattr * nla)1511 static sci_t nla_get_sci(const struct nlattr *nla)
1512 {
1513 return (__force sci_t)nla_get_u64(nla);
1514 }
1515
nla_put_sci(struct sk_buff * skb,int attrtype,sci_t value,int padattr)1516 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1517 int padattr)
1518 {
1519 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1520 }
1521
nla_get_ssci(const struct nlattr * nla)1522 static ssci_t nla_get_ssci(const struct nlattr *nla)
1523 {
1524 return (__force ssci_t)nla_get_u32(nla);
1525 }
1526
nla_put_ssci(struct sk_buff * skb,int attrtype,ssci_t value)1527 static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
1528 {
1529 return nla_put_u32(skb, attrtype, (__force u64)value);
1530 }
1531
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)1532 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1533 struct nlattr **attrs,
1534 struct nlattr **tb_sa,
1535 struct net_device **devp,
1536 struct macsec_secy **secyp,
1537 struct macsec_tx_sc **scp,
1538 u8 *assoc_num)
1539 {
1540 struct net_device *dev;
1541 struct macsec_secy *secy;
1542 struct macsec_tx_sc *tx_sc;
1543 struct macsec_tx_sa *tx_sa;
1544
1545 if (!tb_sa[MACSEC_SA_ATTR_AN])
1546 return ERR_PTR(-EINVAL);
1547
1548 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1549
1550 dev = get_dev_from_nl(net, attrs);
1551 if (IS_ERR(dev))
1552 return ERR_CAST(dev);
1553
1554 if (*assoc_num >= MACSEC_NUM_AN)
1555 return ERR_PTR(-EINVAL);
1556
1557 secy = &macsec_priv(dev)->secy;
1558 tx_sc = &secy->tx_sc;
1559
1560 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1561 if (!tx_sa)
1562 return ERR_PTR(-ENODEV);
1563
1564 *devp = dev;
1565 *scp = tx_sc;
1566 *secyp = secy;
1567 return tx_sa;
1568 }
1569
get_rxsc_from_nl(struct net * net,struct nlattr ** attrs,struct nlattr ** tb_rxsc,struct net_device ** devp,struct macsec_secy ** secyp)1570 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1571 struct nlattr **attrs,
1572 struct nlattr **tb_rxsc,
1573 struct net_device **devp,
1574 struct macsec_secy **secyp)
1575 {
1576 struct net_device *dev;
1577 struct macsec_secy *secy;
1578 struct macsec_rx_sc *rx_sc;
1579 sci_t sci;
1580
1581 dev = get_dev_from_nl(net, attrs);
1582 if (IS_ERR(dev))
1583 return ERR_CAST(dev);
1584
1585 secy = &macsec_priv(dev)->secy;
1586
1587 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1588 return ERR_PTR(-EINVAL);
1589
1590 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1591 rx_sc = find_rx_sc_rtnl(secy, sci);
1592 if (!rx_sc)
1593 return ERR_PTR(-ENODEV);
1594
1595 *secyp = secy;
1596 *devp = dev;
1597
1598 return rx_sc;
1599 }
1600
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)1601 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1602 struct nlattr **attrs,
1603 struct nlattr **tb_rxsc,
1604 struct nlattr **tb_sa,
1605 struct net_device **devp,
1606 struct macsec_secy **secyp,
1607 struct macsec_rx_sc **scp,
1608 u8 *assoc_num)
1609 {
1610 struct macsec_rx_sc *rx_sc;
1611 struct macsec_rx_sa *rx_sa;
1612
1613 if (!tb_sa[MACSEC_SA_ATTR_AN])
1614 return ERR_PTR(-EINVAL);
1615
1616 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1617 if (*assoc_num >= MACSEC_NUM_AN)
1618 return ERR_PTR(-EINVAL);
1619
1620 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1621 if (IS_ERR(rx_sc))
1622 return ERR_CAST(rx_sc);
1623
1624 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1625 if (!rx_sa)
1626 return ERR_PTR(-ENODEV);
1627
1628 *scp = rx_sc;
1629 return rx_sa;
1630 }
1631
1632 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1633 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1634 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1635 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1636 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1637 };
1638
1639 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1640 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1641 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1642 };
1643
1644 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1645 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1646 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1647 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4),
1648 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1649 .len = MACSEC_KEYID_LEN, },
1650 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1651 .len = MACSEC_MAX_KEY_LEN, },
1652 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
1653 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
1654 .len = MACSEC_SALT_LEN, },
1655 };
1656
1657 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
1658 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
1659 };
1660
1661 /* Offloads an operation to a device driver */
macsec_offload(int (* const func)(struct macsec_context *),struct macsec_context * ctx)1662 static int macsec_offload(int (* const func)(struct macsec_context *),
1663 struct macsec_context *ctx)
1664 {
1665 int ret;
1666
1667 if (unlikely(!func))
1668 return 0;
1669
1670 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1671 mutex_lock(&ctx->phydev->lock);
1672
1673 ret = (*func)(ctx);
1674
1675 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1676 mutex_unlock(&ctx->phydev->lock);
1677
1678 return ret;
1679 }
1680
parse_sa_config(struct nlattr ** attrs,struct nlattr ** tb_sa)1681 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1682 {
1683 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1684 return -EINVAL;
1685
1686 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1687 return -EINVAL;
1688
1689 return 0;
1690 }
1691
parse_rxsc_config(struct nlattr ** attrs,struct nlattr ** tb_rxsc)1692 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1693 {
1694 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1695 return -EINVAL;
1696
1697 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1698 return -EINVAL;
1699
1700 return 0;
1701 }
1702
validate_add_rxsa(struct nlattr ** attrs)1703 static bool validate_add_rxsa(struct nlattr **attrs)
1704 {
1705 if (!attrs[MACSEC_SA_ATTR_AN] ||
1706 !attrs[MACSEC_SA_ATTR_KEY] ||
1707 !attrs[MACSEC_SA_ATTR_KEYID])
1708 return false;
1709
1710 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1711 return false;
1712
1713 if (attrs[MACSEC_SA_ATTR_PN] &&
1714 nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1715 return false;
1716
1717 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1718 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1719 return false;
1720 }
1721
1722 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1723 return false;
1724
1725 return true;
1726 }
1727
macsec_add_rxsa(struct sk_buff * skb,struct genl_info * info)1728 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1729 {
1730 struct net_device *dev;
1731 struct nlattr **attrs = info->attrs;
1732 struct macsec_secy *secy;
1733 struct macsec_rx_sc *rx_sc;
1734 struct macsec_rx_sa *rx_sa;
1735 unsigned char assoc_num;
1736 int pn_len;
1737 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1738 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1739 int err;
1740
1741 if (!attrs[MACSEC_ATTR_IFINDEX])
1742 return -EINVAL;
1743
1744 if (parse_sa_config(attrs, tb_sa))
1745 return -EINVAL;
1746
1747 if (parse_rxsc_config(attrs, tb_rxsc))
1748 return -EINVAL;
1749
1750 if (!validate_add_rxsa(tb_sa))
1751 return -EINVAL;
1752
1753 rtnl_lock();
1754 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1755 if (IS_ERR(rx_sc)) {
1756 rtnl_unlock();
1757 return PTR_ERR(rx_sc);
1758 }
1759
1760 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1761
1762 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1763 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1764 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1765 rtnl_unlock();
1766 return -EINVAL;
1767 }
1768
1769 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1770 if (tb_sa[MACSEC_SA_ATTR_PN] &&
1771 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1772 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
1773 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1774 rtnl_unlock();
1775 return -EINVAL;
1776 }
1777
1778 if (secy->xpn) {
1779 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
1780 rtnl_unlock();
1781 return -EINVAL;
1782 }
1783
1784 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
1785 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
1786 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
1787 MACSEC_SALT_LEN);
1788 rtnl_unlock();
1789 return -EINVAL;
1790 }
1791 }
1792
1793 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1794 if (rx_sa) {
1795 rtnl_unlock();
1796 return -EBUSY;
1797 }
1798
1799 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1800 if (!rx_sa) {
1801 rtnl_unlock();
1802 return -ENOMEM;
1803 }
1804
1805 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1806 secy->key_len, secy->icv_len);
1807 if (err < 0) {
1808 kfree(rx_sa);
1809 rtnl_unlock();
1810 return err;
1811 }
1812
1813 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1814 spin_lock_bh(&rx_sa->lock);
1815 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
1816 spin_unlock_bh(&rx_sa->lock);
1817 }
1818
1819 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1820 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1821
1822 rx_sa->sc = rx_sc;
1823
1824 if (secy->xpn) {
1825 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
1826 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
1827 MACSEC_SALT_LEN);
1828 }
1829
1830 /* If h/w offloading is available, propagate to the device */
1831 if (macsec_is_offloaded(netdev_priv(dev))) {
1832 const struct macsec_ops *ops;
1833 struct macsec_context ctx;
1834
1835 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1836 if (!ops) {
1837 err = -EOPNOTSUPP;
1838 goto cleanup;
1839 }
1840
1841 ctx.sa.assoc_num = assoc_num;
1842 ctx.sa.rx_sa = rx_sa;
1843 ctx.secy = secy;
1844 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1845 secy->key_len);
1846
1847 err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1848 memzero_explicit(ctx.sa.key, secy->key_len);
1849 if (err)
1850 goto cleanup;
1851 }
1852
1853 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1854 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1855
1856 rtnl_unlock();
1857
1858 return 0;
1859
1860 cleanup:
1861 macsec_rxsa_put(rx_sa);
1862 rtnl_unlock();
1863 return err;
1864 }
1865
validate_add_rxsc(struct nlattr ** attrs)1866 static bool validate_add_rxsc(struct nlattr **attrs)
1867 {
1868 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1869 return false;
1870
1871 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1872 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1873 return false;
1874 }
1875
1876 return true;
1877 }
1878
macsec_add_rxsc(struct sk_buff * skb,struct genl_info * info)1879 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1880 {
1881 struct net_device *dev;
1882 sci_t sci = MACSEC_UNDEF_SCI;
1883 struct nlattr **attrs = info->attrs;
1884 struct macsec_rx_sc *rx_sc;
1885 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1886 struct macsec_secy *secy;
1887 bool active = true;
1888 int ret;
1889
1890 if (!attrs[MACSEC_ATTR_IFINDEX])
1891 return -EINVAL;
1892
1893 if (parse_rxsc_config(attrs, tb_rxsc))
1894 return -EINVAL;
1895
1896 if (!validate_add_rxsc(tb_rxsc))
1897 return -EINVAL;
1898
1899 rtnl_lock();
1900 dev = get_dev_from_nl(genl_info_net(info), attrs);
1901 if (IS_ERR(dev)) {
1902 rtnl_unlock();
1903 return PTR_ERR(dev);
1904 }
1905
1906 secy = &macsec_priv(dev)->secy;
1907 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1908
1909 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1910 active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1911
1912 rx_sc = create_rx_sc(dev, sci, active);
1913 if (IS_ERR(rx_sc)) {
1914 rtnl_unlock();
1915 return PTR_ERR(rx_sc);
1916 }
1917
1918 if (macsec_is_offloaded(netdev_priv(dev))) {
1919 const struct macsec_ops *ops;
1920 struct macsec_context ctx;
1921
1922 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1923 if (!ops) {
1924 ret = -EOPNOTSUPP;
1925 goto cleanup;
1926 }
1927
1928 ctx.rx_sc = rx_sc;
1929 ctx.secy = secy;
1930
1931 ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1932 if (ret)
1933 goto cleanup;
1934 }
1935
1936 rtnl_unlock();
1937
1938 return 0;
1939
1940 cleanup:
1941 del_rx_sc(secy, sci);
1942 free_rx_sc(rx_sc);
1943 rtnl_unlock();
1944 return ret;
1945 }
1946
validate_add_txsa(struct nlattr ** attrs)1947 static bool validate_add_txsa(struct nlattr **attrs)
1948 {
1949 if (!attrs[MACSEC_SA_ATTR_AN] ||
1950 !attrs[MACSEC_SA_ATTR_PN] ||
1951 !attrs[MACSEC_SA_ATTR_KEY] ||
1952 !attrs[MACSEC_SA_ATTR_KEYID])
1953 return false;
1954
1955 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1956 return false;
1957
1958 if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1959 return false;
1960
1961 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1962 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1963 return false;
1964 }
1965
1966 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1967 return false;
1968
1969 return true;
1970 }
1971
macsec_add_txsa(struct sk_buff * skb,struct genl_info * info)1972 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1973 {
1974 struct net_device *dev;
1975 struct nlattr **attrs = info->attrs;
1976 struct macsec_secy *secy;
1977 struct macsec_tx_sc *tx_sc;
1978 struct macsec_tx_sa *tx_sa;
1979 unsigned char assoc_num;
1980 int pn_len;
1981 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1982 bool was_operational;
1983 int err;
1984
1985 if (!attrs[MACSEC_ATTR_IFINDEX])
1986 return -EINVAL;
1987
1988 if (parse_sa_config(attrs, tb_sa))
1989 return -EINVAL;
1990
1991 if (!validate_add_txsa(tb_sa))
1992 return -EINVAL;
1993
1994 rtnl_lock();
1995 dev = get_dev_from_nl(genl_info_net(info), attrs);
1996 if (IS_ERR(dev)) {
1997 rtnl_unlock();
1998 return PTR_ERR(dev);
1999 }
2000
2001 secy = &macsec_priv(dev)->secy;
2002 tx_sc = &secy->tx_sc;
2003
2004 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
2005
2006 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
2007 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
2008 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
2009 rtnl_unlock();
2010 return -EINVAL;
2011 }
2012
2013 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2014 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2015 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
2016 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2017 rtnl_unlock();
2018 return -EINVAL;
2019 }
2020
2021 if (secy->xpn) {
2022 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
2023 rtnl_unlock();
2024 return -EINVAL;
2025 }
2026
2027 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
2028 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
2029 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
2030 MACSEC_SALT_LEN);
2031 rtnl_unlock();
2032 return -EINVAL;
2033 }
2034 }
2035
2036 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
2037 if (tx_sa) {
2038 rtnl_unlock();
2039 return -EBUSY;
2040 }
2041
2042 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
2043 if (!tx_sa) {
2044 rtnl_unlock();
2045 return -ENOMEM;
2046 }
2047
2048 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2049 secy->key_len, secy->icv_len);
2050 if (err < 0) {
2051 kfree(tx_sa);
2052 rtnl_unlock();
2053 return err;
2054 }
2055
2056 spin_lock_bh(&tx_sa->lock);
2057 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2058 spin_unlock_bh(&tx_sa->lock);
2059
2060 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2061 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2062
2063 was_operational = secy->operational;
2064 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
2065 secy->operational = true;
2066
2067 if (secy->xpn) {
2068 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
2069 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
2070 MACSEC_SALT_LEN);
2071 }
2072
2073 /* If h/w offloading is available, propagate to the device */
2074 if (macsec_is_offloaded(netdev_priv(dev))) {
2075 const struct macsec_ops *ops;
2076 struct macsec_context ctx;
2077
2078 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2079 if (!ops) {
2080 err = -EOPNOTSUPP;
2081 goto cleanup;
2082 }
2083
2084 ctx.sa.assoc_num = assoc_num;
2085 ctx.sa.tx_sa = tx_sa;
2086 ctx.secy = secy;
2087 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2088 secy->key_len);
2089
2090 err = macsec_offload(ops->mdo_add_txsa, &ctx);
2091 memzero_explicit(ctx.sa.key, secy->key_len);
2092 if (err)
2093 goto cleanup;
2094 }
2095
2096 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
2097 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
2098
2099 rtnl_unlock();
2100
2101 return 0;
2102
2103 cleanup:
2104 secy->operational = was_operational;
2105 macsec_txsa_put(tx_sa);
2106 rtnl_unlock();
2107 return err;
2108 }
2109
macsec_del_rxsa(struct sk_buff * skb,struct genl_info * info)2110 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
2111 {
2112 struct nlattr **attrs = info->attrs;
2113 struct net_device *dev;
2114 struct macsec_secy *secy;
2115 struct macsec_rx_sc *rx_sc;
2116 struct macsec_rx_sa *rx_sa;
2117 u8 assoc_num;
2118 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2119 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2120 int ret;
2121
2122 if (!attrs[MACSEC_ATTR_IFINDEX])
2123 return -EINVAL;
2124
2125 if (parse_sa_config(attrs, tb_sa))
2126 return -EINVAL;
2127
2128 if (parse_rxsc_config(attrs, tb_rxsc))
2129 return -EINVAL;
2130
2131 rtnl_lock();
2132 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2133 &dev, &secy, &rx_sc, &assoc_num);
2134 if (IS_ERR(rx_sa)) {
2135 rtnl_unlock();
2136 return PTR_ERR(rx_sa);
2137 }
2138
2139 if (rx_sa->active) {
2140 rtnl_unlock();
2141 return -EBUSY;
2142 }
2143
2144 /* If h/w offloading is available, propagate to the device */
2145 if (macsec_is_offloaded(netdev_priv(dev))) {
2146 const struct macsec_ops *ops;
2147 struct macsec_context ctx;
2148
2149 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2150 if (!ops) {
2151 ret = -EOPNOTSUPP;
2152 goto cleanup;
2153 }
2154
2155 ctx.sa.assoc_num = assoc_num;
2156 ctx.sa.rx_sa = rx_sa;
2157 ctx.secy = secy;
2158
2159 ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
2160 if (ret)
2161 goto cleanup;
2162 }
2163
2164 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
2165 clear_rx_sa(rx_sa);
2166
2167 rtnl_unlock();
2168
2169 return 0;
2170
2171 cleanup:
2172 rtnl_unlock();
2173 return ret;
2174 }
2175
macsec_del_rxsc(struct sk_buff * skb,struct genl_info * info)2176 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
2177 {
2178 struct nlattr **attrs = info->attrs;
2179 struct net_device *dev;
2180 struct macsec_secy *secy;
2181 struct macsec_rx_sc *rx_sc;
2182 sci_t sci;
2183 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2184 int ret;
2185
2186 if (!attrs[MACSEC_ATTR_IFINDEX])
2187 return -EINVAL;
2188
2189 if (parse_rxsc_config(attrs, tb_rxsc))
2190 return -EINVAL;
2191
2192 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
2193 return -EINVAL;
2194
2195 rtnl_lock();
2196 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2197 if (IS_ERR(dev)) {
2198 rtnl_unlock();
2199 return PTR_ERR(dev);
2200 }
2201
2202 secy = &macsec_priv(dev)->secy;
2203 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2204
2205 rx_sc = del_rx_sc(secy, sci);
2206 if (!rx_sc) {
2207 rtnl_unlock();
2208 return -ENODEV;
2209 }
2210
2211 /* If h/w offloading is available, propagate to the device */
2212 if (macsec_is_offloaded(netdev_priv(dev))) {
2213 const struct macsec_ops *ops;
2214 struct macsec_context ctx;
2215
2216 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2217 if (!ops) {
2218 ret = -EOPNOTSUPP;
2219 goto cleanup;
2220 }
2221
2222 ctx.rx_sc = rx_sc;
2223 ctx.secy = secy;
2224 ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2225 if (ret)
2226 goto cleanup;
2227 }
2228
2229 free_rx_sc(rx_sc);
2230 rtnl_unlock();
2231
2232 return 0;
2233
2234 cleanup:
2235 rtnl_unlock();
2236 return ret;
2237 }
2238
macsec_del_txsa(struct sk_buff * skb,struct genl_info * info)2239 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2240 {
2241 struct nlattr **attrs = info->attrs;
2242 struct net_device *dev;
2243 struct macsec_secy *secy;
2244 struct macsec_tx_sc *tx_sc;
2245 struct macsec_tx_sa *tx_sa;
2246 u8 assoc_num;
2247 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2248 int ret;
2249
2250 if (!attrs[MACSEC_ATTR_IFINDEX])
2251 return -EINVAL;
2252
2253 if (parse_sa_config(attrs, tb_sa))
2254 return -EINVAL;
2255
2256 rtnl_lock();
2257 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2258 &dev, &secy, &tx_sc, &assoc_num);
2259 if (IS_ERR(tx_sa)) {
2260 rtnl_unlock();
2261 return PTR_ERR(tx_sa);
2262 }
2263
2264 if (tx_sa->active) {
2265 rtnl_unlock();
2266 return -EBUSY;
2267 }
2268
2269 /* If h/w offloading is available, propagate to the device */
2270 if (macsec_is_offloaded(netdev_priv(dev))) {
2271 const struct macsec_ops *ops;
2272 struct macsec_context ctx;
2273
2274 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2275 if (!ops) {
2276 ret = -EOPNOTSUPP;
2277 goto cleanup;
2278 }
2279
2280 ctx.sa.assoc_num = assoc_num;
2281 ctx.sa.tx_sa = tx_sa;
2282 ctx.secy = secy;
2283
2284 ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2285 if (ret)
2286 goto cleanup;
2287 }
2288
2289 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2290 clear_tx_sa(tx_sa);
2291
2292 rtnl_unlock();
2293
2294 return 0;
2295
2296 cleanup:
2297 rtnl_unlock();
2298 return ret;
2299 }
2300
validate_upd_sa(struct nlattr ** attrs)2301 static bool validate_upd_sa(struct nlattr **attrs)
2302 {
2303 if (!attrs[MACSEC_SA_ATTR_AN] ||
2304 attrs[MACSEC_SA_ATTR_KEY] ||
2305 attrs[MACSEC_SA_ATTR_KEYID] ||
2306 attrs[MACSEC_SA_ATTR_SSCI] ||
2307 attrs[MACSEC_SA_ATTR_SALT])
2308 return false;
2309
2310 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2311 return false;
2312
2313 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
2314 return false;
2315
2316 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2317 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2318 return false;
2319 }
2320
2321 return true;
2322 }
2323
macsec_upd_txsa(struct sk_buff * skb,struct genl_info * info)2324 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2325 {
2326 struct nlattr **attrs = info->attrs;
2327 struct net_device *dev;
2328 struct macsec_secy *secy;
2329 struct macsec_tx_sc *tx_sc;
2330 struct macsec_tx_sa *tx_sa;
2331 u8 assoc_num;
2332 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2333 bool was_operational, was_active;
2334 pn_t prev_pn;
2335 int ret = 0;
2336
2337 prev_pn.full64 = 0;
2338
2339 if (!attrs[MACSEC_ATTR_IFINDEX])
2340 return -EINVAL;
2341
2342 if (parse_sa_config(attrs, tb_sa))
2343 return -EINVAL;
2344
2345 if (!validate_upd_sa(tb_sa))
2346 return -EINVAL;
2347
2348 rtnl_lock();
2349 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2350 &dev, &secy, &tx_sc, &assoc_num);
2351 if (IS_ERR(tx_sa)) {
2352 rtnl_unlock();
2353 return PTR_ERR(tx_sa);
2354 }
2355
2356 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2357 int pn_len;
2358
2359 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2360 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2361 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
2362 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2363 rtnl_unlock();
2364 return -EINVAL;
2365 }
2366
2367 spin_lock_bh(&tx_sa->lock);
2368 prev_pn = tx_sa->next_pn_halves;
2369 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2370 spin_unlock_bh(&tx_sa->lock);
2371 }
2372
2373 was_active = tx_sa->active;
2374 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2375 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2376
2377 was_operational = secy->operational;
2378 if (assoc_num == tx_sc->encoding_sa)
2379 secy->operational = tx_sa->active;
2380
2381 /* If h/w offloading is available, propagate to the device */
2382 if (macsec_is_offloaded(netdev_priv(dev))) {
2383 const struct macsec_ops *ops;
2384 struct macsec_context ctx;
2385
2386 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2387 if (!ops) {
2388 ret = -EOPNOTSUPP;
2389 goto cleanup;
2390 }
2391
2392 ctx.sa.assoc_num = assoc_num;
2393 ctx.sa.tx_sa = tx_sa;
2394 ctx.sa.update_pn = !!prev_pn.full64;
2395 ctx.secy = secy;
2396
2397 ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
2398 if (ret)
2399 goto cleanup;
2400 }
2401
2402 rtnl_unlock();
2403
2404 return 0;
2405
2406 cleanup:
2407 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2408 spin_lock_bh(&tx_sa->lock);
2409 tx_sa->next_pn_halves = prev_pn;
2410 spin_unlock_bh(&tx_sa->lock);
2411 }
2412 tx_sa->active = was_active;
2413 secy->operational = was_operational;
2414 rtnl_unlock();
2415 return ret;
2416 }
2417
macsec_upd_rxsa(struct sk_buff * skb,struct genl_info * info)2418 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2419 {
2420 struct nlattr **attrs = info->attrs;
2421 struct net_device *dev;
2422 struct macsec_secy *secy;
2423 struct macsec_rx_sc *rx_sc;
2424 struct macsec_rx_sa *rx_sa;
2425 u8 assoc_num;
2426 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2427 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2428 bool was_active;
2429 pn_t prev_pn;
2430 int ret = 0;
2431
2432 prev_pn.full64 = 0;
2433
2434 if (!attrs[MACSEC_ATTR_IFINDEX])
2435 return -EINVAL;
2436
2437 if (parse_rxsc_config(attrs, tb_rxsc))
2438 return -EINVAL;
2439
2440 if (parse_sa_config(attrs, tb_sa))
2441 return -EINVAL;
2442
2443 if (!validate_upd_sa(tb_sa))
2444 return -EINVAL;
2445
2446 rtnl_lock();
2447 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2448 &dev, &secy, &rx_sc, &assoc_num);
2449 if (IS_ERR(rx_sa)) {
2450 rtnl_unlock();
2451 return PTR_ERR(rx_sa);
2452 }
2453
2454 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2455 int pn_len;
2456
2457 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2458 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2459 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
2460 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2461 rtnl_unlock();
2462 return -EINVAL;
2463 }
2464
2465 spin_lock_bh(&rx_sa->lock);
2466 prev_pn = rx_sa->next_pn_halves;
2467 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2468 spin_unlock_bh(&rx_sa->lock);
2469 }
2470
2471 was_active = rx_sa->active;
2472 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2473 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2474
2475 /* If h/w offloading is available, propagate to the device */
2476 if (macsec_is_offloaded(netdev_priv(dev))) {
2477 const struct macsec_ops *ops;
2478 struct macsec_context ctx;
2479
2480 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2481 if (!ops) {
2482 ret = -EOPNOTSUPP;
2483 goto cleanup;
2484 }
2485
2486 ctx.sa.assoc_num = assoc_num;
2487 ctx.sa.rx_sa = rx_sa;
2488 ctx.sa.update_pn = !!prev_pn.full64;
2489 ctx.secy = secy;
2490
2491 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2492 if (ret)
2493 goto cleanup;
2494 }
2495
2496 rtnl_unlock();
2497 return 0;
2498
2499 cleanup:
2500 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2501 spin_lock_bh(&rx_sa->lock);
2502 rx_sa->next_pn_halves = prev_pn;
2503 spin_unlock_bh(&rx_sa->lock);
2504 }
2505 rx_sa->active = was_active;
2506 rtnl_unlock();
2507 return ret;
2508 }
2509
macsec_upd_rxsc(struct sk_buff * skb,struct genl_info * info)2510 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2511 {
2512 struct nlattr **attrs = info->attrs;
2513 struct net_device *dev;
2514 struct macsec_secy *secy;
2515 struct macsec_rx_sc *rx_sc;
2516 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2517 unsigned int prev_n_rx_sc;
2518 bool was_active;
2519 int ret;
2520
2521 if (!attrs[MACSEC_ATTR_IFINDEX])
2522 return -EINVAL;
2523
2524 if (parse_rxsc_config(attrs, tb_rxsc))
2525 return -EINVAL;
2526
2527 if (!validate_add_rxsc(tb_rxsc))
2528 return -EINVAL;
2529
2530 rtnl_lock();
2531 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2532 if (IS_ERR(rx_sc)) {
2533 rtnl_unlock();
2534 return PTR_ERR(rx_sc);
2535 }
2536
2537 was_active = rx_sc->active;
2538 prev_n_rx_sc = secy->n_rx_sc;
2539 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2540 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2541
2542 if (rx_sc->active != new)
2543 secy->n_rx_sc += new ? 1 : -1;
2544
2545 rx_sc->active = new;
2546 }
2547
2548 /* If h/w offloading is available, propagate to the device */
2549 if (macsec_is_offloaded(netdev_priv(dev))) {
2550 const struct macsec_ops *ops;
2551 struct macsec_context ctx;
2552
2553 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2554 if (!ops) {
2555 ret = -EOPNOTSUPP;
2556 goto cleanup;
2557 }
2558
2559 ctx.rx_sc = rx_sc;
2560 ctx.secy = secy;
2561
2562 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2563 if (ret)
2564 goto cleanup;
2565 }
2566
2567 rtnl_unlock();
2568
2569 return 0;
2570
2571 cleanup:
2572 secy->n_rx_sc = prev_n_rx_sc;
2573 rx_sc->active = was_active;
2574 rtnl_unlock();
2575 return ret;
2576 }
2577
macsec_is_configured(struct macsec_dev * macsec)2578 static bool macsec_is_configured(struct macsec_dev *macsec)
2579 {
2580 struct macsec_secy *secy = &macsec->secy;
2581 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2582 int i;
2583
2584 if (secy->rx_sc)
2585 return true;
2586
2587 for (i = 0; i < MACSEC_NUM_AN; i++)
2588 if (tx_sc->sa[i])
2589 return true;
2590
2591 return false;
2592 }
2593
macsec_update_offload(struct net_device * dev,enum macsec_offload offload)2594 static int macsec_update_offload(struct net_device *dev, enum macsec_offload offload)
2595 {
2596 enum macsec_offload prev_offload;
2597 const struct macsec_ops *ops;
2598 struct macsec_context ctx;
2599 struct macsec_dev *macsec;
2600 int ret = 0;
2601
2602 macsec = macsec_priv(dev);
2603
2604 /* Check if the offloading mode is supported by the underlying layers */
2605 if (offload != MACSEC_OFFLOAD_OFF &&
2606 !macsec_check_offload(offload, macsec))
2607 return -EOPNOTSUPP;
2608
2609 /* Check if the net device is busy. */
2610 if (netif_running(dev))
2611 return -EBUSY;
2612
2613 /* Check if the device already has rules configured: we do not support
2614 * rules migration.
2615 */
2616 if (macsec_is_configured(macsec))
2617 return -EBUSY;
2618
2619 prev_offload = macsec->offload;
2620
2621 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2622 macsec, &ctx);
2623 if (!ops)
2624 return -EOPNOTSUPP;
2625
2626 macsec->offload = offload;
2627
2628 ctx.secy = &macsec->secy;
2629 ret = offload == MACSEC_OFFLOAD_OFF ? macsec_offload(ops->mdo_del_secy, &ctx)
2630 : macsec_offload(ops->mdo_add_secy, &ctx);
2631 if (ret)
2632 macsec->offload = prev_offload;
2633
2634 return ret;
2635 }
2636
macsec_upd_offload(struct sk_buff * skb,struct genl_info * info)2637 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2638 {
2639 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2640 struct nlattr **attrs = info->attrs;
2641 enum macsec_offload offload;
2642 struct macsec_dev *macsec;
2643 struct net_device *dev;
2644 int ret = 0;
2645
2646 if (!attrs[MACSEC_ATTR_IFINDEX])
2647 return -EINVAL;
2648
2649 if (!attrs[MACSEC_ATTR_OFFLOAD])
2650 return -EINVAL;
2651
2652 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2653 attrs[MACSEC_ATTR_OFFLOAD],
2654 macsec_genl_offload_policy, NULL))
2655 return -EINVAL;
2656
2657 rtnl_lock();
2658
2659 dev = get_dev_from_nl(genl_info_net(info), attrs);
2660 if (IS_ERR(dev)) {
2661 ret = PTR_ERR(dev);
2662 goto out;
2663 }
2664 macsec = macsec_priv(dev);
2665
2666 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) {
2667 ret = -EINVAL;
2668 goto out;
2669 }
2670
2671 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2672
2673 if (macsec->offload != offload)
2674 ret = macsec_update_offload(dev, offload);
2675 out:
2676 rtnl_unlock();
2677 return ret;
2678 }
2679
get_tx_sa_stats(struct net_device * dev,int an,struct macsec_tx_sa * tx_sa,struct macsec_tx_sa_stats * sum)2680 static void get_tx_sa_stats(struct net_device *dev, int an,
2681 struct macsec_tx_sa *tx_sa,
2682 struct macsec_tx_sa_stats *sum)
2683 {
2684 struct macsec_dev *macsec = macsec_priv(dev);
2685 int cpu;
2686
2687 /* If h/w offloading is available, propagate to the device */
2688 if (macsec_is_offloaded(macsec)) {
2689 const struct macsec_ops *ops;
2690 struct macsec_context ctx;
2691
2692 ops = macsec_get_ops(macsec, &ctx);
2693 if (ops) {
2694 ctx.sa.assoc_num = an;
2695 ctx.sa.tx_sa = tx_sa;
2696 ctx.stats.tx_sa_stats = sum;
2697 ctx.secy = &macsec_priv(dev)->secy;
2698 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
2699 }
2700 return;
2701 }
2702
2703 for_each_possible_cpu(cpu) {
2704 const struct macsec_tx_sa_stats *stats =
2705 per_cpu_ptr(tx_sa->stats, cpu);
2706
2707 sum->OutPktsProtected += stats->OutPktsProtected;
2708 sum->OutPktsEncrypted += stats->OutPktsEncrypted;
2709 }
2710 }
2711
copy_tx_sa_stats(struct sk_buff * skb,struct macsec_tx_sa_stats * sum)2712 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
2713 {
2714 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
2715 sum->OutPktsProtected) ||
2716 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2717 sum->OutPktsEncrypted))
2718 return -EMSGSIZE;
2719
2720 return 0;
2721 }
2722
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)2723 static void get_rx_sa_stats(struct net_device *dev,
2724 struct macsec_rx_sc *rx_sc, int an,
2725 struct macsec_rx_sa *rx_sa,
2726 struct macsec_rx_sa_stats *sum)
2727 {
2728 struct macsec_dev *macsec = macsec_priv(dev);
2729 int cpu;
2730
2731 /* If h/w offloading is available, propagate to the device */
2732 if (macsec_is_offloaded(macsec)) {
2733 const struct macsec_ops *ops;
2734 struct macsec_context ctx;
2735
2736 ops = macsec_get_ops(macsec, &ctx);
2737 if (ops) {
2738 ctx.sa.assoc_num = an;
2739 ctx.sa.rx_sa = rx_sa;
2740 ctx.stats.rx_sa_stats = sum;
2741 ctx.secy = &macsec_priv(dev)->secy;
2742 ctx.rx_sc = rx_sc;
2743 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
2744 }
2745 return;
2746 }
2747
2748 for_each_possible_cpu(cpu) {
2749 const struct macsec_rx_sa_stats *stats =
2750 per_cpu_ptr(rx_sa->stats, cpu);
2751
2752 sum->InPktsOK += stats->InPktsOK;
2753 sum->InPktsInvalid += stats->InPktsInvalid;
2754 sum->InPktsNotValid += stats->InPktsNotValid;
2755 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
2756 sum->InPktsUnusedSA += stats->InPktsUnusedSA;
2757 }
2758 }
2759
copy_rx_sa_stats(struct sk_buff * skb,struct macsec_rx_sa_stats * sum)2760 static int copy_rx_sa_stats(struct sk_buff *skb,
2761 struct macsec_rx_sa_stats *sum)
2762 {
2763 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
2764 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
2765 sum->InPktsInvalid) ||
2766 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
2767 sum->InPktsNotValid) ||
2768 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2769 sum->InPktsNotUsingSA) ||
2770 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
2771 sum->InPktsUnusedSA))
2772 return -EMSGSIZE;
2773
2774 return 0;
2775 }
2776
get_rx_sc_stats(struct net_device * dev,struct macsec_rx_sc * rx_sc,struct macsec_rx_sc_stats * sum)2777 static void get_rx_sc_stats(struct net_device *dev,
2778 struct macsec_rx_sc *rx_sc,
2779 struct macsec_rx_sc_stats *sum)
2780 {
2781 struct macsec_dev *macsec = macsec_priv(dev);
2782 int cpu;
2783
2784 /* If h/w offloading is available, propagate to the device */
2785 if (macsec_is_offloaded(macsec)) {
2786 const struct macsec_ops *ops;
2787 struct macsec_context ctx;
2788
2789 ops = macsec_get_ops(macsec, &ctx);
2790 if (ops) {
2791 ctx.stats.rx_sc_stats = sum;
2792 ctx.secy = &macsec_priv(dev)->secy;
2793 ctx.rx_sc = rx_sc;
2794 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
2795 }
2796 return;
2797 }
2798
2799 for_each_possible_cpu(cpu) {
2800 const struct pcpu_rx_sc_stats *stats;
2801 struct macsec_rx_sc_stats tmp;
2802 unsigned int start;
2803
2804 stats = per_cpu_ptr(rx_sc->stats, cpu);
2805 do {
2806 start = u64_stats_fetch_begin(&stats->syncp);
2807 memcpy(&tmp, &stats->stats, sizeof(tmp));
2808 } while (u64_stats_fetch_retry(&stats->syncp, start));
2809
2810 sum->InOctetsValidated += tmp.InOctetsValidated;
2811 sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
2812 sum->InPktsUnchecked += tmp.InPktsUnchecked;
2813 sum->InPktsDelayed += tmp.InPktsDelayed;
2814 sum->InPktsOK += tmp.InPktsOK;
2815 sum->InPktsInvalid += tmp.InPktsInvalid;
2816 sum->InPktsLate += tmp.InPktsLate;
2817 sum->InPktsNotValid += tmp.InPktsNotValid;
2818 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2819 sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
2820 }
2821 }
2822
copy_rx_sc_stats(struct sk_buff * skb,struct macsec_rx_sc_stats * sum)2823 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
2824 {
2825 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2826 sum->InOctetsValidated,
2827 MACSEC_RXSC_STATS_ATTR_PAD) ||
2828 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2829 sum->InOctetsDecrypted,
2830 MACSEC_RXSC_STATS_ATTR_PAD) ||
2831 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2832 sum->InPktsUnchecked,
2833 MACSEC_RXSC_STATS_ATTR_PAD) ||
2834 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2835 sum->InPktsDelayed,
2836 MACSEC_RXSC_STATS_ATTR_PAD) ||
2837 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2838 sum->InPktsOK,
2839 MACSEC_RXSC_STATS_ATTR_PAD) ||
2840 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2841 sum->InPktsInvalid,
2842 MACSEC_RXSC_STATS_ATTR_PAD) ||
2843 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2844 sum->InPktsLate,
2845 MACSEC_RXSC_STATS_ATTR_PAD) ||
2846 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2847 sum->InPktsNotValid,
2848 MACSEC_RXSC_STATS_ATTR_PAD) ||
2849 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2850 sum->InPktsNotUsingSA,
2851 MACSEC_RXSC_STATS_ATTR_PAD) ||
2852 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2853 sum->InPktsUnusedSA,
2854 MACSEC_RXSC_STATS_ATTR_PAD))
2855 return -EMSGSIZE;
2856
2857 return 0;
2858 }
2859
get_tx_sc_stats(struct net_device * dev,struct macsec_tx_sc_stats * sum)2860 static void get_tx_sc_stats(struct net_device *dev,
2861 struct macsec_tx_sc_stats *sum)
2862 {
2863 struct macsec_dev *macsec = macsec_priv(dev);
2864 int cpu;
2865
2866 /* If h/w offloading is available, propagate to the device */
2867 if (macsec_is_offloaded(macsec)) {
2868 const struct macsec_ops *ops;
2869 struct macsec_context ctx;
2870
2871 ops = macsec_get_ops(macsec, &ctx);
2872 if (ops) {
2873 ctx.stats.tx_sc_stats = sum;
2874 ctx.secy = &macsec_priv(dev)->secy;
2875 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
2876 }
2877 return;
2878 }
2879
2880 for_each_possible_cpu(cpu) {
2881 const struct pcpu_tx_sc_stats *stats;
2882 struct macsec_tx_sc_stats tmp;
2883 unsigned int start;
2884
2885 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
2886 do {
2887 start = u64_stats_fetch_begin(&stats->syncp);
2888 memcpy(&tmp, &stats->stats, sizeof(tmp));
2889 } while (u64_stats_fetch_retry(&stats->syncp, start));
2890
2891 sum->OutPktsProtected += tmp.OutPktsProtected;
2892 sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
2893 sum->OutOctetsProtected += tmp.OutOctetsProtected;
2894 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2895 }
2896 }
2897
copy_tx_sc_stats(struct sk_buff * skb,struct macsec_tx_sc_stats * sum)2898 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
2899 {
2900 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2901 sum->OutPktsProtected,
2902 MACSEC_TXSC_STATS_ATTR_PAD) ||
2903 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2904 sum->OutPktsEncrypted,
2905 MACSEC_TXSC_STATS_ATTR_PAD) ||
2906 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2907 sum->OutOctetsProtected,
2908 MACSEC_TXSC_STATS_ATTR_PAD) ||
2909 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2910 sum->OutOctetsEncrypted,
2911 MACSEC_TXSC_STATS_ATTR_PAD))
2912 return -EMSGSIZE;
2913
2914 return 0;
2915 }
2916
get_secy_stats(struct net_device * dev,struct macsec_dev_stats * sum)2917 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
2918 {
2919 struct macsec_dev *macsec = macsec_priv(dev);
2920 int cpu;
2921
2922 /* If h/w offloading is available, propagate to the device */
2923 if (macsec_is_offloaded(macsec)) {
2924 const struct macsec_ops *ops;
2925 struct macsec_context ctx;
2926
2927 ops = macsec_get_ops(macsec, &ctx);
2928 if (ops) {
2929 ctx.stats.dev_stats = sum;
2930 ctx.secy = &macsec_priv(dev)->secy;
2931 macsec_offload(ops->mdo_get_dev_stats, &ctx);
2932 }
2933 return;
2934 }
2935
2936 for_each_possible_cpu(cpu) {
2937 const struct pcpu_secy_stats *stats;
2938 struct macsec_dev_stats tmp;
2939 unsigned int start;
2940
2941 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
2942 do {
2943 start = u64_stats_fetch_begin(&stats->syncp);
2944 memcpy(&tmp, &stats->stats, sizeof(tmp));
2945 } while (u64_stats_fetch_retry(&stats->syncp, start));
2946
2947 sum->OutPktsUntagged += tmp.OutPktsUntagged;
2948 sum->InPktsUntagged += tmp.InPktsUntagged;
2949 sum->OutPktsTooLong += tmp.OutPktsTooLong;
2950 sum->InPktsNoTag += tmp.InPktsNoTag;
2951 sum->InPktsBadTag += tmp.InPktsBadTag;
2952 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2953 sum->InPktsNoSCI += tmp.InPktsNoSCI;
2954 sum->InPktsOverrun += tmp.InPktsOverrun;
2955 }
2956 }
2957
copy_secy_stats(struct sk_buff * skb,struct macsec_dev_stats * sum)2958 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
2959 {
2960 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2961 sum->OutPktsUntagged,
2962 MACSEC_SECY_STATS_ATTR_PAD) ||
2963 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2964 sum->InPktsUntagged,
2965 MACSEC_SECY_STATS_ATTR_PAD) ||
2966 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2967 sum->OutPktsTooLong,
2968 MACSEC_SECY_STATS_ATTR_PAD) ||
2969 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2970 sum->InPktsNoTag,
2971 MACSEC_SECY_STATS_ATTR_PAD) ||
2972 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2973 sum->InPktsBadTag,
2974 MACSEC_SECY_STATS_ATTR_PAD) ||
2975 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2976 sum->InPktsUnknownSCI,
2977 MACSEC_SECY_STATS_ATTR_PAD) ||
2978 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2979 sum->InPktsNoSCI,
2980 MACSEC_SECY_STATS_ATTR_PAD) ||
2981 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2982 sum->InPktsOverrun,
2983 MACSEC_SECY_STATS_ATTR_PAD))
2984 return -EMSGSIZE;
2985
2986 return 0;
2987 }
2988
nla_put_secy(struct macsec_secy * secy,struct sk_buff * skb)2989 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2990 {
2991 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2992 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
2993 MACSEC_ATTR_SECY);
2994 u64 csid;
2995
2996 if (!secy_nest)
2997 return 1;
2998
2999 switch (secy->key_len) {
3000 case MACSEC_GCM_AES_128_SAK_LEN:
3001 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
3002 break;
3003 case MACSEC_GCM_AES_256_SAK_LEN:
3004 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
3005 break;
3006 default:
3007 goto cancel;
3008 }
3009
3010 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
3011 MACSEC_SECY_ATTR_PAD) ||
3012 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
3013 csid, MACSEC_SECY_ATTR_PAD) ||
3014 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
3015 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
3016 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
3017 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
3018 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
3019 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
3020 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
3021 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
3022 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
3023 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
3024 goto cancel;
3025
3026 if (secy->replay_protect) {
3027 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
3028 goto cancel;
3029 }
3030
3031 nla_nest_end(skb, secy_nest);
3032 return 0;
3033
3034 cancel:
3035 nla_nest_cancel(skb, secy_nest);
3036 return 1;
3037 }
3038
3039 static noinline_for_stack int
dump_secy(struct macsec_secy * secy,struct net_device * dev,struct sk_buff * skb,struct netlink_callback * cb)3040 dump_secy(struct macsec_secy *secy, struct net_device *dev,
3041 struct sk_buff *skb, struct netlink_callback *cb)
3042 {
3043 struct macsec_tx_sc_stats tx_sc_stats = {0, };
3044 struct macsec_tx_sa_stats tx_sa_stats = {0, };
3045 struct macsec_rx_sc_stats rx_sc_stats = {0, };
3046 struct macsec_rx_sa_stats rx_sa_stats = {0, };
3047 struct macsec_dev *macsec = netdev_priv(dev);
3048 struct macsec_dev_stats dev_stats = {0, };
3049 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3050 struct nlattr *txsa_list, *rxsc_list;
3051 struct macsec_rx_sc *rx_sc;
3052 struct nlattr *attr;
3053 void *hdr;
3054 int i, j;
3055
3056 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3057 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
3058 if (!hdr)
3059 return -EMSGSIZE;
3060
3061 genl_dump_check_consistent(cb, hdr);
3062
3063 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
3064 goto nla_put_failure;
3065
3066 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
3067 if (!attr)
3068 goto nla_put_failure;
3069 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
3070 goto nla_put_failure;
3071 nla_nest_end(skb, attr);
3072
3073 if (nla_put_secy(secy, skb))
3074 goto nla_put_failure;
3075
3076 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
3077 if (!attr)
3078 goto nla_put_failure;
3079
3080 get_tx_sc_stats(dev, &tx_sc_stats);
3081 if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
3082 nla_nest_cancel(skb, attr);
3083 goto nla_put_failure;
3084 }
3085 nla_nest_end(skb, attr);
3086
3087 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
3088 if (!attr)
3089 goto nla_put_failure;
3090 get_secy_stats(dev, &dev_stats);
3091 if (copy_secy_stats(skb, &dev_stats)) {
3092 nla_nest_cancel(skb, attr);
3093 goto nla_put_failure;
3094 }
3095 nla_nest_end(skb, attr);
3096
3097 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
3098 if (!txsa_list)
3099 goto nla_put_failure;
3100 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
3101 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
3102 struct nlattr *txsa_nest;
3103 u64 pn;
3104 int pn_len;
3105
3106 if (!tx_sa)
3107 continue;
3108
3109 txsa_nest = nla_nest_start_noflag(skb, j++);
3110 if (!txsa_nest) {
3111 nla_nest_cancel(skb, txsa_list);
3112 goto nla_put_failure;
3113 }
3114
3115 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
3116 if (!attr) {
3117 nla_nest_cancel(skb, txsa_nest);
3118 nla_nest_cancel(skb, txsa_list);
3119 goto nla_put_failure;
3120 }
3121 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
3122 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
3123 if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
3124 nla_nest_cancel(skb, attr);
3125 nla_nest_cancel(skb, txsa_nest);
3126 nla_nest_cancel(skb, txsa_list);
3127 goto nla_put_failure;
3128 }
3129 nla_nest_end(skb, attr);
3130
3131 if (secy->xpn) {
3132 pn = tx_sa->next_pn;
3133 pn_len = MACSEC_XPN_PN_LEN;
3134 } else {
3135 pn = tx_sa->next_pn_halves.lower;
3136 pn_len = MACSEC_DEFAULT_PN_LEN;
3137 }
3138
3139 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3140 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3141 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
3142 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
3143 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
3144 nla_nest_cancel(skb, txsa_nest);
3145 nla_nest_cancel(skb, txsa_list);
3146 goto nla_put_failure;
3147 }
3148
3149 nla_nest_end(skb, txsa_nest);
3150 }
3151 nla_nest_end(skb, txsa_list);
3152
3153 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
3154 if (!rxsc_list)
3155 goto nla_put_failure;
3156
3157 j = 1;
3158 for_each_rxsc_rtnl(secy, rx_sc) {
3159 int k;
3160 struct nlattr *rxsa_list;
3161 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
3162
3163 if (!rxsc_nest) {
3164 nla_nest_cancel(skb, rxsc_list);
3165 goto nla_put_failure;
3166 }
3167
3168 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
3169 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
3170 MACSEC_RXSC_ATTR_PAD)) {
3171 nla_nest_cancel(skb, rxsc_nest);
3172 nla_nest_cancel(skb, rxsc_list);
3173 goto nla_put_failure;
3174 }
3175
3176 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
3177 if (!attr) {
3178 nla_nest_cancel(skb, rxsc_nest);
3179 nla_nest_cancel(skb, rxsc_list);
3180 goto nla_put_failure;
3181 }
3182 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
3183 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
3184 if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
3185 nla_nest_cancel(skb, attr);
3186 nla_nest_cancel(skb, rxsc_nest);
3187 nla_nest_cancel(skb, rxsc_list);
3188 goto nla_put_failure;
3189 }
3190 nla_nest_end(skb, attr);
3191
3192 rxsa_list = nla_nest_start_noflag(skb,
3193 MACSEC_RXSC_ATTR_SA_LIST);
3194 if (!rxsa_list) {
3195 nla_nest_cancel(skb, rxsc_nest);
3196 nla_nest_cancel(skb, rxsc_list);
3197 goto nla_put_failure;
3198 }
3199
3200 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
3201 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
3202 struct nlattr *rxsa_nest;
3203 u64 pn;
3204 int pn_len;
3205
3206 if (!rx_sa)
3207 continue;
3208
3209 rxsa_nest = nla_nest_start_noflag(skb, k++);
3210 if (!rxsa_nest) {
3211 nla_nest_cancel(skb, rxsa_list);
3212 nla_nest_cancel(skb, rxsc_nest);
3213 nla_nest_cancel(skb, rxsc_list);
3214 goto nla_put_failure;
3215 }
3216
3217 attr = nla_nest_start_noflag(skb,
3218 MACSEC_SA_ATTR_STATS);
3219 if (!attr) {
3220 nla_nest_cancel(skb, rxsa_list);
3221 nla_nest_cancel(skb, rxsc_nest);
3222 nla_nest_cancel(skb, rxsc_list);
3223 goto nla_put_failure;
3224 }
3225 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
3226 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
3227 if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
3228 nla_nest_cancel(skb, attr);
3229 nla_nest_cancel(skb, rxsa_list);
3230 nla_nest_cancel(skb, rxsc_nest);
3231 nla_nest_cancel(skb, rxsc_list);
3232 goto nla_put_failure;
3233 }
3234 nla_nest_end(skb, attr);
3235
3236 if (secy->xpn) {
3237 pn = rx_sa->next_pn;
3238 pn_len = MACSEC_XPN_PN_LEN;
3239 } else {
3240 pn = rx_sa->next_pn_halves.lower;
3241 pn_len = MACSEC_DEFAULT_PN_LEN;
3242 }
3243
3244 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3245 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3246 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
3247 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
3248 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
3249 nla_nest_cancel(skb, rxsa_nest);
3250 nla_nest_cancel(skb, rxsc_nest);
3251 nla_nest_cancel(skb, rxsc_list);
3252 goto nla_put_failure;
3253 }
3254 nla_nest_end(skb, rxsa_nest);
3255 }
3256
3257 nla_nest_end(skb, rxsa_list);
3258 nla_nest_end(skb, rxsc_nest);
3259 }
3260
3261 nla_nest_end(skb, rxsc_list);
3262
3263 genlmsg_end(skb, hdr);
3264
3265 return 0;
3266
3267 nla_put_failure:
3268 genlmsg_cancel(skb, hdr);
3269 return -EMSGSIZE;
3270 }
3271
3272 static int macsec_generation = 1; /* protected by RTNL */
3273
macsec_dump_txsc(struct sk_buff * skb,struct netlink_callback * cb)3274 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
3275 {
3276 struct net *net = sock_net(skb->sk);
3277 struct net_device *dev;
3278 int dev_idx, d;
3279
3280 dev_idx = cb->args[0];
3281
3282 d = 0;
3283 rtnl_lock();
3284
3285 cb->seq = macsec_generation;
3286
3287 for_each_netdev(net, dev) {
3288 struct macsec_secy *secy;
3289
3290 if (d < dev_idx)
3291 goto next;
3292
3293 if (!netif_is_macsec(dev))
3294 goto next;
3295
3296 secy = &macsec_priv(dev)->secy;
3297 if (dump_secy(secy, dev, skb, cb) < 0)
3298 goto done;
3299 next:
3300 d++;
3301 }
3302
3303 done:
3304 rtnl_unlock();
3305 cb->args[0] = d;
3306 return skb->len;
3307 }
3308
3309 static const struct genl_small_ops macsec_genl_ops[] = {
3310 {
3311 .cmd = MACSEC_CMD_GET_TXSC,
3312 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3313 .dumpit = macsec_dump_txsc,
3314 },
3315 {
3316 .cmd = MACSEC_CMD_ADD_RXSC,
3317 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3318 .doit = macsec_add_rxsc,
3319 .flags = GENL_ADMIN_PERM,
3320 },
3321 {
3322 .cmd = MACSEC_CMD_DEL_RXSC,
3323 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3324 .doit = macsec_del_rxsc,
3325 .flags = GENL_ADMIN_PERM,
3326 },
3327 {
3328 .cmd = MACSEC_CMD_UPD_RXSC,
3329 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3330 .doit = macsec_upd_rxsc,
3331 .flags = GENL_ADMIN_PERM,
3332 },
3333 {
3334 .cmd = MACSEC_CMD_ADD_TXSA,
3335 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3336 .doit = macsec_add_txsa,
3337 .flags = GENL_ADMIN_PERM,
3338 },
3339 {
3340 .cmd = MACSEC_CMD_DEL_TXSA,
3341 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3342 .doit = macsec_del_txsa,
3343 .flags = GENL_ADMIN_PERM,
3344 },
3345 {
3346 .cmd = MACSEC_CMD_UPD_TXSA,
3347 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3348 .doit = macsec_upd_txsa,
3349 .flags = GENL_ADMIN_PERM,
3350 },
3351 {
3352 .cmd = MACSEC_CMD_ADD_RXSA,
3353 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3354 .doit = macsec_add_rxsa,
3355 .flags = GENL_ADMIN_PERM,
3356 },
3357 {
3358 .cmd = MACSEC_CMD_DEL_RXSA,
3359 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3360 .doit = macsec_del_rxsa,
3361 .flags = GENL_ADMIN_PERM,
3362 },
3363 {
3364 .cmd = MACSEC_CMD_UPD_RXSA,
3365 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3366 .doit = macsec_upd_rxsa,
3367 .flags = GENL_ADMIN_PERM,
3368 },
3369 {
3370 .cmd = MACSEC_CMD_UPD_OFFLOAD,
3371 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3372 .doit = macsec_upd_offload,
3373 .flags = GENL_ADMIN_PERM,
3374 },
3375 };
3376
3377 static struct genl_family macsec_fam __ro_after_init = {
3378 .name = MACSEC_GENL_NAME,
3379 .hdrsize = 0,
3380 .version = MACSEC_GENL_VERSION,
3381 .maxattr = MACSEC_ATTR_MAX,
3382 .policy = macsec_genl_policy,
3383 .netnsok = true,
3384 .module = THIS_MODULE,
3385 .small_ops = macsec_genl_ops,
3386 .n_small_ops = ARRAY_SIZE(macsec_genl_ops),
3387 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1,
3388 };
3389
macsec_start_xmit(struct sk_buff * skb,struct net_device * dev)3390 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3391 struct net_device *dev)
3392 {
3393 struct macsec_dev *macsec = netdev_priv(dev);
3394 struct macsec_secy *secy = &macsec->secy;
3395 struct pcpu_secy_stats *secy_stats;
3396 int ret, len;
3397
3398 if (macsec_is_offloaded(netdev_priv(dev))) {
3399 struct metadata_dst *md_dst = secy->tx_sc.md_dst;
3400
3401 skb_dst_drop(skb);
3402 dst_hold(&md_dst->dst);
3403 skb_dst_set(skb, &md_dst->dst);
3404 skb->dev = macsec->real_dev;
3405 return dev_queue_xmit(skb);
3406 }
3407
3408 /* 10.5 */
3409 if (!secy->protect_frames) {
3410 secy_stats = this_cpu_ptr(macsec->stats);
3411 u64_stats_update_begin(&secy_stats->syncp);
3412 secy_stats->stats.OutPktsUntagged++;
3413 u64_stats_update_end(&secy_stats->syncp);
3414 skb->dev = macsec->real_dev;
3415 len = skb->len;
3416 ret = dev_queue_xmit(skb);
3417 count_tx(dev, ret, len);
3418 return ret;
3419 }
3420
3421 if (!secy->operational) {
3422 kfree_skb(skb);
3423 DEV_STATS_INC(dev, tx_dropped);
3424 return NETDEV_TX_OK;
3425 }
3426
3427 len = skb->len;
3428 skb = macsec_encrypt(skb, dev);
3429 if (IS_ERR(skb)) {
3430 if (PTR_ERR(skb) != -EINPROGRESS)
3431 DEV_STATS_INC(dev, tx_dropped);
3432 return NETDEV_TX_OK;
3433 }
3434
3435 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3436
3437 macsec_encrypt_finish(skb, dev);
3438 ret = dev_queue_xmit(skb);
3439 count_tx(dev, ret, len);
3440 return ret;
3441 }
3442
3443 #define MACSEC_FEATURES \
3444 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3445
macsec_dev_init(struct net_device * dev)3446 static int macsec_dev_init(struct net_device *dev)
3447 {
3448 struct macsec_dev *macsec = macsec_priv(dev);
3449 struct net_device *real_dev = macsec->real_dev;
3450 int err;
3451
3452 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3453 if (!dev->tstats)
3454 return -ENOMEM;
3455
3456 err = gro_cells_init(&macsec->gro_cells, dev);
3457 if (err) {
3458 free_percpu(dev->tstats);
3459 return err;
3460 }
3461
3462 dev->features = real_dev->features & MACSEC_FEATURES;
3463 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
3464
3465 dev->needed_headroom = real_dev->needed_headroom +
3466 MACSEC_NEEDED_HEADROOM;
3467 dev->needed_tailroom = real_dev->needed_tailroom +
3468 MACSEC_NEEDED_TAILROOM;
3469
3470 if (is_zero_ether_addr(dev->dev_addr))
3471 eth_hw_addr_inherit(dev, real_dev);
3472 if (is_zero_ether_addr(dev->broadcast))
3473 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3474
3475 /* Get macsec's reference to real_dev */
3476 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL);
3477
3478 return 0;
3479 }
3480
macsec_dev_uninit(struct net_device * dev)3481 static void macsec_dev_uninit(struct net_device *dev)
3482 {
3483 struct macsec_dev *macsec = macsec_priv(dev);
3484
3485 gro_cells_destroy(&macsec->gro_cells);
3486 free_percpu(dev->tstats);
3487 }
3488
macsec_fix_features(struct net_device * dev,netdev_features_t features)3489 static netdev_features_t macsec_fix_features(struct net_device *dev,
3490 netdev_features_t features)
3491 {
3492 struct macsec_dev *macsec = macsec_priv(dev);
3493 struct net_device *real_dev = macsec->real_dev;
3494
3495 features &= (real_dev->features & MACSEC_FEATURES) |
3496 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3497 features |= NETIF_F_LLTX;
3498
3499 return features;
3500 }
3501
macsec_dev_open(struct net_device * dev)3502 static int macsec_dev_open(struct net_device *dev)
3503 {
3504 struct macsec_dev *macsec = macsec_priv(dev);
3505 struct net_device *real_dev = macsec->real_dev;
3506 int err;
3507
3508 err = dev_uc_add(real_dev, dev->dev_addr);
3509 if (err < 0)
3510 return err;
3511
3512 if (dev->flags & IFF_ALLMULTI) {
3513 err = dev_set_allmulti(real_dev, 1);
3514 if (err < 0)
3515 goto del_unicast;
3516 }
3517
3518 if (dev->flags & IFF_PROMISC) {
3519 err = dev_set_promiscuity(real_dev, 1);
3520 if (err < 0)
3521 goto clear_allmulti;
3522 }
3523
3524 /* If h/w offloading is available, propagate to the device */
3525 if (macsec_is_offloaded(macsec)) {
3526 const struct macsec_ops *ops;
3527 struct macsec_context ctx;
3528
3529 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3530 if (!ops) {
3531 err = -EOPNOTSUPP;
3532 goto clear_allmulti;
3533 }
3534
3535 ctx.secy = &macsec->secy;
3536 err = macsec_offload(ops->mdo_dev_open, &ctx);
3537 if (err)
3538 goto clear_allmulti;
3539 }
3540
3541 if (netif_carrier_ok(real_dev))
3542 netif_carrier_on(dev);
3543
3544 return 0;
3545 clear_allmulti:
3546 if (dev->flags & IFF_ALLMULTI)
3547 dev_set_allmulti(real_dev, -1);
3548 del_unicast:
3549 dev_uc_del(real_dev, dev->dev_addr);
3550 netif_carrier_off(dev);
3551 return err;
3552 }
3553
macsec_dev_stop(struct net_device * dev)3554 static int macsec_dev_stop(struct net_device *dev)
3555 {
3556 struct macsec_dev *macsec = macsec_priv(dev);
3557 struct net_device *real_dev = macsec->real_dev;
3558
3559 netif_carrier_off(dev);
3560
3561 /* If h/w offloading is available, propagate to the device */
3562 if (macsec_is_offloaded(macsec)) {
3563 const struct macsec_ops *ops;
3564 struct macsec_context ctx;
3565
3566 ops = macsec_get_ops(macsec, &ctx);
3567 if (ops) {
3568 ctx.secy = &macsec->secy;
3569 macsec_offload(ops->mdo_dev_stop, &ctx);
3570 }
3571 }
3572
3573 dev_mc_unsync(real_dev, dev);
3574 dev_uc_unsync(real_dev, dev);
3575
3576 if (dev->flags & IFF_ALLMULTI)
3577 dev_set_allmulti(real_dev, -1);
3578
3579 if (dev->flags & IFF_PROMISC)
3580 dev_set_promiscuity(real_dev, -1);
3581
3582 dev_uc_del(real_dev, dev->dev_addr);
3583
3584 return 0;
3585 }
3586
macsec_dev_change_rx_flags(struct net_device * dev,int change)3587 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3588 {
3589 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3590
3591 if (!(dev->flags & IFF_UP))
3592 return;
3593
3594 if (change & IFF_ALLMULTI)
3595 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3596
3597 if (change & IFF_PROMISC)
3598 dev_set_promiscuity(real_dev,
3599 dev->flags & IFF_PROMISC ? 1 : -1);
3600 }
3601
macsec_dev_set_rx_mode(struct net_device * dev)3602 static void macsec_dev_set_rx_mode(struct net_device *dev)
3603 {
3604 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3605
3606 dev_mc_sync(real_dev, dev);
3607 dev_uc_sync(real_dev, dev);
3608 }
3609
macsec_set_mac_address(struct net_device * dev,void * p)3610 static int macsec_set_mac_address(struct net_device *dev, void *p)
3611 {
3612 struct macsec_dev *macsec = macsec_priv(dev);
3613 struct net_device *real_dev = macsec->real_dev;
3614 struct sockaddr *addr = p;
3615 int err;
3616
3617 if (!is_valid_ether_addr(addr->sa_data))
3618 return -EADDRNOTAVAIL;
3619
3620 if (!(dev->flags & IFF_UP))
3621 goto out;
3622
3623 err = dev_uc_add(real_dev, addr->sa_data);
3624 if (err < 0)
3625 return err;
3626
3627 dev_uc_del(real_dev, dev->dev_addr);
3628
3629 out:
3630 eth_hw_addr_set(dev, addr->sa_data);
3631
3632 /* If h/w offloading is available, propagate to the device */
3633 if (macsec_is_offloaded(macsec)) {
3634 const struct macsec_ops *ops;
3635 struct macsec_context ctx;
3636
3637 ops = macsec_get_ops(macsec, &ctx);
3638 if (ops) {
3639 ctx.secy = &macsec->secy;
3640 macsec_offload(ops->mdo_upd_secy, &ctx);
3641 }
3642 }
3643
3644 return 0;
3645 }
3646
macsec_change_mtu(struct net_device * dev,int new_mtu)3647 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3648 {
3649 struct macsec_dev *macsec = macsec_priv(dev);
3650 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3651
3652 if (macsec->real_dev->mtu - extra < new_mtu)
3653 return -ERANGE;
3654
3655 dev->mtu = new_mtu;
3656
3657 return 0;
3658 }
3659
macsec_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * s)3660 static void macsec_get_stats64(struct net_device *dev,
3661 struct rtnl_link_stats64 *s)
3662 {
3663 if (!dev->tstats)
3664 return;
3665
3666 dev_fetch_sw_netstats(s, dev->tstats);
3667
3668 s->rx_dropped = DEV_STATS_READ(dev, rx_dropped);
3669 s->tx_dropped = DEV_STATS_READ(dev, tx_dropped);
3670 s->rx_errors = DEV_STATS_READ(dev, rx_errors);
3671 }
3672
macsec_get_iflink(const struct net_device * dev)3673 static int macsec_get_iflink(const struct net_device *dev)
3674 {
3675 return macsec_priv(dev)->real_dev->ifindex;
3676 }
3677
3678 static const struct net_device_ops macsec_netdev_ops = {
3679 .ndo_init = macsec_dev_init,
3680 .ndo_uninit = macsec_dev_uninit,
3681 .ndo_open = macsec_dev_open,
3682 .ndo_stop = macsec_dev_stop,
3683 .ndo_fix_features = macsec_fix_features,
3684 .ndo_change_mtu = macsec_change_mtu,
3685 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
3686 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
3687 .ndo_set_mac_address = macsec_set_mac_address,
3688 .ndo_start_xmit = macsec_start_xmit,
3689 .ndo_get_stats64 = macsec_get_stats64,
3690 .ndo_get_iflink = macsec_get_iflink,
3691 };
3692
3693 static const struct device_type macsec_type = {
3694 .name = "macsec",
3695 };
3696
3697 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3698 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3699 [IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3700 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3701 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3702 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3703 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3704 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3705 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3706 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3707 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3708 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3709 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3710 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3711 [IFLA_MACSEC_OFFLOAD] = { .type = NLA_U8 },
3712 };
3713
macsec_free_netdev(struct net_device * dev)3714 static void macsec_free_netdev(struct net_device *dev)
3715 {
3716 struct macsec_dev *macsec = macsec_priv(dev);
3717
3718 dst_release(&macsec->secy.tx_sc.md_dst->dst);
3719 free_percpu(macsec->stats);
3720 free_percpu(macsec->secy.tx_sc.stats);
3721
3722 /* Get rid of the macsec's reference to real_dev */
3723 netdev_put(macsec->real_dev, &macsec->dev_tracker);
3724 }
3725
macsec_setup(struct net_device * dev)3726 static void macsec_setup(struct net_device *dev)
3727 {
3728 ether_setup(dev);
3729 dev->min_mtu = 0;
3730 dev->max_mtu = ETH_MAX_MTU;
3731 dev->priv_flags |= IFF_NO_QUEUE;
3732 dev->netdev_ops = &macsec_netdev_ops;
3733 dev->needs_free_netdev = true;
3734 dev->priv_destructor = macsec_free_netdev;
3735 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3736
3737 eth_zero_addr(dev->broadcast);
3738 }
3739
macsec_changelink_common(struct net_device * dev,struct nlattr * data[])3740 static int macsec_changelink_common(struct net_device *dev,
3741 struct nlattr *data[])
3742 {
3743 struct macsec_secy *secy;
3744 struct macsec_tx_sc *tx_sc;
3745
3746 secy = &macsec_priv(dev)->secy;
3747 tx_sc = &secy->tx_sc;
3748
3749 if (data[IFLA_MACSEC_ENCODING_SA]) {
3750 struct macsec_tx_sa *tx_sa;
3751
3752 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3753 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3754
3755 secy->operational = tx_sa && tx_sa->active;
3756 }
3757
3758 if (data[IFLA_MACSEC_ENCRYPT])
3759 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3760
3761 if (data[IFLA_MACSEC_PROTECT])
3762 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3763
3764 if (data[IFLA_MACSEC_INC_SCI])
3765 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3766
3767 if (data[IFLA_MACSEC_ES])
3768 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3769
3770 if (data[IFLA_MACSEC_SCB])
3771 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3772
3773 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3774 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3775
3776 if (data[IFLA_MACSEC_VALIDATION])
3777 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3778
3779 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3780 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3781 case MACSEC_CIPHER_ID_GCM_AES_128:
3782 case MACSEC_DEFAULT_CIPHER_ID:
3783 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3784 secy->xpn = false;
3785 break;
3786 case MACSEC_CIPHER_ID_GCM_AES_256:
3787 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3788 secy->xpn = false;
3789 break;
3790 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
3791 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3792 secy->xpn = true;
3793 break;
3794 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
3795 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3796 secy->xpn = true;
3797 break;
3798 default:
3799 return -EINVAL;
3800 }
3801 }
3802
3803 if (data[IFLA_MACSEC_WINDOW]) {
3804 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3805
3806 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window
3807 * for XPN cipher suites */
3808 if (secy->xpn &&
3809 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW)
3810 return -EINVAL;
3811 }
3812
3813 return 0;
3814 }
3815
macsec_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)3816 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3817 struct nlattr *data[],
3818 struct netlink_ext_ack *extack)
3819 {
3820 struct macsec_dev *macsec = macsec_priv(dev);
3821 bool macsec_offload_state_change = false;
3822 enum macsec_offload offload;
3823 struct macsec_tx_sc tx_sc;
3824 struct macsec_secy secy;
3825 int ret;
3826
3827 if (!data)
3828 return 0;
3829
3830 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3831 data[IFLA_MACSEC_ICV_LEN] ||
3832 data[IFLA_MACSEC_SCI] ||
3833 data[IFLA_MACSEC_PORT])
3834 return -EINVAL;
3835
3836 /* Keep a copy of unmodified secy and tx_sc, in case the offload
3837 * propagation fails, to revert macsec_changelink_common.
3838 */
3839 memcpy(&secy, &macsec->secy, sizeof(secy));
3840 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3841
3842 ret = macsec_changelink_common(dev, data);
3843 if (ret)
3844 goto cleanup;
3845
3846 if (data[IFLA_MACSEC_OFFLOAD]) {
3847 offload = nla_get_u8(data[IFLA_MACSEC_OFFLOAD]);
3848 if (macsec->offload != offload) {
3849 macsec_offload_state_change = true;
3850 ret = macsec_update_offload(dev, offload);
3851 if (ret)
3852 goto cleanup;
3853 }
3854 }
3855
3856 /* If h/w offloading is available, propagate to the device */
3857 if (!macsec_offload_state_change && macsec_is_offloaded(macsec)) {
3858 const struct macsec_ops *ops;
3859 struct macsec_context ctx;
3860
3861 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3862 if (!ops) {
3863 ret = -EOPNOTSUPP;
3864 goto cleanup;
3865 }
3866
3867 ctx.secy = &macsec->secy;
3868 ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3869 if (ret)
3870 goto cleanup;
3871 }
3872
3873 return 0;
3874
3875 cleanup:
3876 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3877 memcpy(&macsec->secy, &secy, sizeof(secy));
3878
3879 return ret;
3880 }
3881
macsec_del_dev(struct macsec_dev * macsec)3882 static void macsec_del_dev(struct macsec_dev *macsec)
3883 {
3884 int i;
3885
3886 while (macsec->secy.rx_sc) {
3887 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3888
3889 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3890 free_rx_sc(rx_sc);
3891 }
3892
3893 for (i = 0; i < MACSEC_NUM_AN; i++) {
3894 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3895
3896 if (sa) {
3897 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3898 clear_tx_sa(sa);
3899 }
3900 }
3901 }
3902
macsec_common_dellink(struct net_device * dev,struct list_head * head)3903 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3904 {
3905 struct macsec_dev *macsec = macsec_priv(dev);
3906 struct net_device *real_dev = macsec->real_dev;
3907
3908 /* If h/w offloading is available, propagate to the device */
3909 if (macsec_is_offloaded(macsec)) {
3910 const struct macsec_ops *ops;
3911 struct macsec_context ctx;
3912
3913 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3914 if (ops) {
3915 ctx.secy = &macsec->secy;
3916 macsec_offload(ops->mdo_del_secy, &ctx);
3917 }
3918 }
3919
3920 unregister_netdevice_queue(dev, head);
3921 list_del_rcu(&macsec->secys);
3922 macsec_del_dev(macsec);
3923 netdev_upper_dev_unlink(real_dev, dev);
3924
3925 macsec_generation++;
3926 }
3927
macsec_dellink(struct net_device * dev,struct list_head * head)3928 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3929 {
3930 struct macsec_dev *macsec = macsec_priv(dev);
3931 struct net_device *real_dev = macsec->real_dev;
3932 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3933
3934 macsec_common_dellink(dev, head);
3935
3936 if (list_empty(&rxd->secys)) {
3937 netdev_rx_handler_unregister(real_dev);
3938 kfree(rxd);
3939 }
3940 }
3941
register_macsec_dev(struct net_device * real_dev,struct net_device * dev)3942 static int register_macsec_dev(struct net_device *real_dev,
3943 struct net_device *dev)
3944 {
3945 struct macsec_dev *macsec = macsec_priv(dev);
3946 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3947
3948 if (!rxd) {
3949 int err;
3950
3951 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3952 if (!rxd)
3953 return -ENOMEM;
3954
3955 INIT_LIST_HEAD(&rxd->secys);
3956
3957 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3958 rxd);
3959 if (err < 0) {
3960 kfree(rxd);
3961 return err;
3962 }
3963 }
3964
3965 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3966 return 0;
3967 }
3968
sci_exists(struct net_device * dev,sci_t sci)3969 static bool sci_exists(struct net_device *dev, sci_t sci)
3970 {
3971 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3972 struct macsec_dev *macsec;
3973
3974 list_for_each_entry(macsec, &rxd->secys, secys) {
3975 if (macsec->secy.sci == sci)
3976 return true;
3977 }
3978
3979 return false;
3980 }
3981
dev_to_sci(struct net_device * dev,__be16 port)3982 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3983 {
3984 return make_sci(dev->dev_addr, port);
3985 }
3986
macsec_add_dev(struct net_device * dev,sci_t sci,u8 icv_len)3987 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3988 {
3989 struct macsec_dev *macsec = macsec_priv(dev);
3990 struct macsec_secy *secy = &macsec->secy;
3991
3992 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3993 if (!macsec->stats)
3994 return -ENOMEM;
3995
3996 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3997 if (!secy->tx_sc.stats)
3998 return -ENOMEM;
3999
4000 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL);
4001 if (!secy->tx_sc.md_dst)
4002 /* macsec and secy percpu stats will be freed when unregistering
4003 * net_device in macsec_free_netdev()
4004 */
4005 return -ENOMEM;
4006
4007 if (sci == MACSEC_UNDEF_SCI)
4008 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4009
4010 secy->netdev = dev;
4011 secy->operational = true;
4012 secy->key_len = DEFAULT_SAK_LEN;
4013 secy->icv_len = icv_len;
4014 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
4015 secy->protect_frames = true;
4016 secy->replay_protect = false;
4017 secy->xpn = DEFAULT_XPN;
4018
4019 secy->sci = sci;
4020 secy->tx_sc.md_dst->u.macsec_info.sci = sci;
4021 secy->tx_sc.active = true;
4022 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
4023 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
4024 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
4025 secy->tx_sc.end_station = false;
4026 secy->tx_sc.scb = false;
4027
4028 return 0;
4029 }
4030
4031 static struct lock_class_key macsec_netdev_addr_lock_key;
4032
macsec_newlink(struct net * net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)4033 static int macsec_newlink(struct net *net, struct net_device *dev,
4034 struct nlattr *tb[], struct nlattr *data[],
4035 struct netlink_ext_ack *extack)
4036 {
4037 struct macsec_dev *macsec = macsec_priv(dev);
4038 rx_handler_func_t *rx_handler;
4039 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4040 struct net_device *real_dev;
4041 int err, mtu;
4042 sci_t sci;
4043
4044 if (!tb[IFLA_LINK])
4045 return -EINVAL;
4046 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
4047 if (!real_dev)
4048 return -ENODEV;
4049 if (real_dev->type != ARPHRD_ETHER)
4050 return -EINVAL;
4051
4052 dev->priv_flags |= IFF_MACSEC;
4053
4054 macsec->real_dev = real_dev;
4055
4056 if (data && data[IFLA_MACSEC_OFFLOAD])
4057 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
4058 else
4059 /* MACsec offloading is off by default */
4060 macsec->offload = MACSEC_OFFLOAD_OFF;
4061
4062 /* Check if the offloading mode is supported by the underlying layers */
4063 if (macsec->offload != MACSEC_OFFLOAD_OFF &&
4064 !macsec_check_offload(macsec->offload, macsec))
4065 return -EOPNOTSUPP;
4066
4067 /* send_sci must be set to true when transmit sci explicitly is set */
4068 if ((data && data[IFLA_MACSEC_SCI]) &&
4069 (data && data[IFLA_MACSEC_INC_SCI])) {
4070 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
4071
4072 if (!send_sci)
4073 return -EINVAL;
4074 }
4075
4076 if (data && data[IFLA_MACSEC_ICV_LEN])
4077 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4078 mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
4079 if (mtu < 0)
4080 dev->mtu = 0;
4081 else
4082 dev->mtu = mtu;
4083
4084 rx_handler = rtnl_dereference(real_dev->rx_handler);
4085 if (rx_handler && rx_handler != macsec_handle_frame)
4086 return -EBUSY;
4087
4088 err = register_netdevice(dev);
4089 if (err < 0)
4090 return err;
4091
4092 netdev_lockdep_set_classes(dev);
4093 lockdep_set_class(&dev->addr_list_lock,
4094 &macsec_netdev_addr_lock_key);
4095
4096 err = netdev_upper_dev_link(real_dev, dev, extack);
4097 if (err < 0)
4098 goto unregister;
4099
4100 /* need to be already registered so that ->init has run and
4101 * the MAC addr is set
4102 */
4103 if (data && data[IFLA_MACSEC_SCI])
4104 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
4105 else if (data && data[IFLA_MACSEC_PORT])
4106 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
4107 else
4108 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4109
4110 if (rx_handler && sci_exists(real_dev, sci)) {
4111 err = -EBUSY;
4112 goto unlink;
4113 }
4114
4115 err = macsec_add_dev(dev, sci, icv_len);
4116 if (err)
4117 goto unlink;
4118
4119 if (data) {
4120 err = macsec_changelink_common(dev, data);
4121 if (err)
4122 goto del_dev;
4123 }
4124
4125 /* If h/w offloading is available, propagate to the device */
4126 if (macsec_is_offloaded(macsec)) {
4127 const struct macsec_ops *ops;
4128 struct macsec_context ctx;
4129
4130 ops = macsec_get_ops(macsec, &ctx);
4131 if (ops) {
4132 ctx.secy = &macsec->secy;
4133 err = macsec_offload(ops->mdo_add_secy, &ctx);
4134 if (err)
4135 goto del_dev;
4136 }
4137 }
4138
4139 err = register_macsec_dev(real_dev, dev);
4140 if (err < 0)
4141 goto del_dev;
4142
4143 netif_stacked_transfer_operstate(real_dev, dev);
4144 linkwatch_fire_event(dev);
4145
4146 macsec_generation++;
4147
4148 return 0;
4149
4150 del_dev:
4151 macsec_del_dev(macsec);
4152 unlink:
4153 netdev_upper_dev_unlink(real_dev, dev);
4154 unregister:
4155 unregister_netdevice(dev);
4156 return err;
4157 }
4158
macsec_validate_attr(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)4159 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
4160 struct netlink_ext_ack *extack)
4161 {
4162 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
4163 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4164 int flag;
4165 bool es, scb, sci;
4166
4167 if (!data)
4168 return 0;
4169
4170 if (data[IFLA_MACSEC_CIPHER_SUITE])
4171 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
4172
4173 if (data[IFLA_MACSEC_ICV_LEN]) {
4174 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4175 if (icv_len != MACSEC_DEFAULT_ICV_LEN) {
4176 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
4177 struct crypto_aead *dummy_tfm;
4178
4179 dummy_tfm = macsec_alloc_tfm(dummy_key,
4180 DEFAULT_SAK_LEN,
4181 icv_len);
4182 if (IS_ERR(dummy_tfm))
4183 return PTR_ERR(dummy_tfm);
4184 crypto_free_aead(dummy_tfm);
4185 }
4186 }
4187
4188 switch (csid) {
4189 case MACSEC_CIPHER_ID_GCM_AES_128:
4190 case MACSEC_CIPHER_ID_GCM_AES_256:
4191 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
4192 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
4193 case MACSEC_DEFAULT_CIPHER_ID:
4194 if (icv_len < MACSEC_MIN_ICV_LEN ||
4195 icv_len > MACSEC_STD_ICV_LEN)
4196 return -EINVAL;
4197 break;
4198 default:
4199 return -EINVAL;
4200 }
4201
4202 if (data[IFLA_MACSEC_ENCODING_SA]) {
4203 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
4204 return -EINVAL;
4205 }
4206
4207 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
4208 flag < IFLA_MACSEC_VALIDATION;
4209 flag++) {
4210 if (data[flag]) {
4211 if (nla_get_u8(data[flag]) > 1)
4212 return -EINVAL;
4213 }
4214 }
4215
4216 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
4217 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
4218 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
4219
4220 if ((sci && (scb || es)) || (scb && es))
4221 return -EINVAL;
4222
4223 if (data[IFLA_MACSEC_VALIDATION] &&
4224 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
4225 return -EINVAL;
4226
4227 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
4228 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
4229 !data[IFLA_MACSEC_WINDOW])
4230 return -EINVAL;
4231
4232 return 0;
4233 }
4234
macsec_get_link_net(const struct net_device * dev)4235 static struct net *macsec_get_link_net(const struct net_device *dev)
4236 {
4237 return dev_net(macsec_priv(dev)->real_dev);
4238 }
4239
macsec_get_real_dev(const struct net_device * dev)4240 struct net_device *macsec_get_real_dev(const struct net_device *dev)
4241 {
4242 return macsec_priv(dev)->real_dev;
4243 }
4244 EXPORT_SYMBOL_GPL(macsec_get_real_dev);
4245
macsec_netdev_is_offloaded(struct net_device * dev)4246 bool macsec_netdev_is_offloaded(struct net_device *dev)
4247 {
4248 return macsec_is_offloaded(macsec_priv(dev));
4249 }
4250 EXPORT_SYMBOL_GPL(macsec_netdev_is_offloaded);
4251
macsec_get_size(const struct net_device * dev)4252 static size_t macsec_get_size(const struct net_device *dev)
4253 {
4254 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
4255 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
4256 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
4257 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
4258 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
4259 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
4260 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
4261 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
4262 nla_total_size(1) + /* IFLA_MACSEC_ES */
4263 nla_total_size(1) + /* IFLA_MACSEC_SCB */
4264 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
4265 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
4266 nla_total_size(1) + /* IFLA_MACSEC_OFFLOAD */
4267 0;
4268 }
4269
macsec_fill_info(struct sk_buff * skb,const struct net_device * dev)4270 static int macsec_fill_info(struct sk_buff *skb,
4271 const struct net_device *dev)
4272 {
4273 struct macsec_tx_sc *tx_sc;
4274 struct macsec_dev *macsec;
4275 struct macsec_secy *secy;
4276 u64 csid;
4277
4278 macsec = macsec_priv(dev);
4279 secy = &macsec->secy;
4280 tx_sc = &secy->tx_sc;
4281
4282 switch (secy->key_len) {
4283 case MACSEC_GCM_AES_128_SAK_LEN:
4284 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
4285 break;
4286 case MACSEC_GCM_AES_256_SAK_LEN:
4287 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
4288 break;
4289 default:
4290 goto nla_put_failure;
4291 }
4292
4293 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
4294 IFLA_MACSEC_PAD) ||
4295 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
4296 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
4297 csid, IFLA_MACSEC_PAD) ||
4298 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
4299 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
4300 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
4301 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
4302 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
4303 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
4304 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
4305 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
4306 nla_put_u8(skb, IFLA_MACSEC_OFFLOAD, macsec->offload) ||
4307 0)
4308 goto nla_put_failure;
4309
4310 if (secy->replay_protect) {
4311 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
4312 goto nla_put_failure;
4313 }
4314
4315 return 0;
4316
4317 nla_put_failure:
4318 return -EMSGSIZE;
4319 }
4320
4321 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
4322 .kind = "macsec",
4323 .priv_size = sizeof(struct macsec_dev),
4324 .maxtype = IFLA_MACSEC_MAX,
4325 .policy = macsec_rtnl_policy,
4326 .setup = macsec_setup,
4327 .validate = macsec_validate_attr,
4328 .newlink = macsec_newlink,
4329 .changelink = macsec_changelink,
4330 .dellink = macsec_dellink,
4331 .get_size = macsec_get_size,
4332 .fill_info = macsec_fill_info,
4333 .get_link_net = macsec_get_link_net,
4334 };
4335
is_macsec_master(struct net_device * dev)4336 static bool is_macsec_master(struct net_device *dev)
4337 {
4338 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
4339 }
4340
macsec_notify(struct notifier_block * this,unsigned long event,void * ptr)4341 static int macsec_notify(struct notifier_block *this, unsigned long event,
4342 void *ptr)
4343 {
4344 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
4345 LIST_HEAD(head);
4346
4347 if (!is_macsec_master(real_dev))
4348 return NOTIFY_DONE;
4349
4350 switch (event) {
4351 case NETDEV_DOWN:
4352 case NETDEV_UP:
4353 case NETDEV_CHANGE: {
4354 struct macsec_dev *m, *n;
4355 struct macsec_rxh_data *rxd;
4356
4357 rxd = macsec_data_rtnl(real_dev);
4358 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4359 struct net_device *dev = m->secy.netdev;
4360
4361 netif_stacked_transfer_operstate(real_dev, dev);
4362 }
4363 break;
4364 }
4365 case NETDEV_UNREGISTER: {
4366 struct macsec_dev *m, *n;
4367 struct macsec_rxh_data *rxd;
4368
4369 rxd = macsec_data_rtnl(real_dev);
4370 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4371 macsec_common_dellink(m->secy.netdev, &head);
4372 }
4373
4374 netdev_rx_handler_unregister(real_dev);
4375 kfree(rxd);
4376
4377 unregister_netdevice_many(&head);
4378 break;
4379 }
4380 case NETDEV_CHANGEMTU: {
4381 struct macsec_dev *m;
4382 struct macsec_rxh_data *rxd;
4383
4384 rxd = macsec_data_rtnl(real_dev);
4385 list_for_each_entry(m, &rxd->secys, secys) {
4386 struct net_device *dev = m->secy.netdev;
4387 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
4388 macsec_extra_len(true));
4389
4390 if (dev->mtu > mtu)
4391 dev_set_mtu(dev, mtu);
4392 }
4393 }
4394 }
4395
4396 return NOTIFY_OK;
4397 }
4398
4399 static struct notifier_block macsec_notifier = {
4400 .notifier_call = macsec_notify,
4401 };
4402
macsec_init(void)4403 static int __init macsec_init(void)
4404 {
4405 int err;
4406
4407 pr_info("MACsec IEEE 802.1AE\n");
4408 err = register_netdevice_notifier(&macsec_notifier);
4409 if (err)
4410 return err;
4411
4412 err = rtnl_link_register(&macsec_link_ops);
4413 if (err)
4414 goto notifier;
4415
4416 err = genl_register_family(&macsec_fam);
4417 if (err)
4418 goto rtnl;
4419
4420 return 0;
4421
4422 rtnl:
4423 rtnl_link_unregister(&macsec_link_ops);
4424 notifier:
4425 unregister_netdevice_notifier(&macsec_notifier);
4426 return err;
4427 }
4428
macsec_exit(void)4429 static void __exit macsec_exit(void)
4430 {
4431 genl_unregister_family(&macsec_fam);
4432 rtnl_link_unregister(&macsec_link_ops);
4433 unregister_netdevice_notifier(&macsec_notifier);
4434 rcu_barrier();
4435 }
4436
4437 module_init(macsec_init);
4438 module_exit(macsec_exit);
4439
4440 MODULE_ALIAS_RTNL_LINK("macsec");
4441 MODULE_ALIAS_GENL_FAMILY("macsec");
4442
4443 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
4444 MODULE_LICENSE("GPL v2");
4445