1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * drivers/net/macsec.c - MACsec device
4 *
5 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
6 */
7
8 #include <linux/types.h>
9 #include <linux/skbuff.h>
10 #include <linux/socket.h>
11 #include <linux/module.h>
12 #include <crypto/aead.h>
13 #include <linux/etherdevice.h>
14 #include <linux/netdevice.h>
15 #include <linux/rtnetlink.h>
16 #include <linux/refcount.h>
17 #include <net/genetlink.h>
18 #include <net/sock.h>
19 #include <net/gro_cells.h>
20 #include <net/macsec.h>
21 #include <linux/phy.h>
22 #include <linux/byteorder/generic.h>
23 #include <linux/if_arp.h>
24
25 #include <uapi/linux/if_macsec.h>
26
27 #define MACSEC_SCI_LEN 8
28
29 /* SecTAG length = macsec_eth_header without the optional SCI */
30 #define MACSEC_TAG_LEN 6
31
32 struct macsec_eth_header {
33 struct ethhdr eth;
34 /* SecTAG */
35 u8 tci_an;
36 #if defined(__LITTLE_ENDIAN_BITFIELD)
37 u8 short_length:6,
38 unused:2;
39 #elif defined(__BIG_ENDIAN_BITFIELD)
40 u8 unused:2,
41 short_length:6;
42 #else
43 #error "Please fix <asm/byteorder.h>"
44 #endif
45 __be32 packet_number;
46 u8 secure_channel_id[8]; /* optional */
47 } __packed;
48
49 #define MACSEC_TCI_VERSION 0x80
50 #define MACSEC_TCI_ES 0x40 /* end station */
51 #define MACSEC_TCI_SC 0x20 /* SCI present */
52 #define MACSEC_TCI_SCB 0x10 /* epon */
53 #define MACSEC_TCI_E 0x08 /* encryption */
54 #define MACSEC_TCI_C 0x04 /* changed text */
55 #define MACSEC_AN_MASK 0x03 /* association number */
56 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
57
58 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
59 #define MIN_NON_SHORT_LEN 48
60
61 #define GCM_AES_IV_LEN 12
62 #define DEFAULT_ICV_LEN 16
63
64 #define for_each_rxsc(secy, sc) \
65 for (sc = rcu_dereference_bh(secy->rx_sc); \
66 sc; \
67 sc = rcu_dereference_bh(sc->next))
68 #define for_each_rxsc_rtnl(secy, sc) \
69 for (sc = rtnl_dereference(secy->rx_sc); \
70 sc; \
71 sc = rtnl_dereference(sc->next))
72
73 #define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31)))
74
75 struct gcm_iv_xpn {
76 union {
77 u8 short_secure_channel_id[4];
78 ssci_t ssci;
79 };
80 __be64 pn;
81 } __packed;
82
83 struct gcm_iv {
84 union {
85 u8 secure_channel_id[8];
86 sci_t sci;
87 };
88 __be32 pn;
89 };
90
91 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
92
93 struct pcpu_secy_stats {
94 struct macsec_dev_stats stats;
95 struct u64_stats_sync syncp;
96 };
97
98 /**
99 * struct macsec_dev - private data
100 * @secy: SecY config
101 * @real_dev: pointer to underlying netdevice
102 * @stats: MACsec device stats
103 * @secys: linked list of SecY's on the underlying device
104 * @gro_cells: pointer to the Generic Receive Offload cell
105 * @offload: status of offloading on the MACsec device
106 */
107 struct macsec_dev {
108 struct macsec_secy secy;
109 struct net_device *real_dev;
110 struct pcpu_secy_stats __percpu *stats;
111 struct list_head secys;
112 struct gro_cells gro_cells;
113 enum macsec_offload offload;
114 };
115
116 /**
117 * struct macsec_rxh_data - rx_handler private argument
118 * @secys: linked list of SecY's on this underlying device
119 */
120 struct macsec_rxh_data {
121 struct list_head secys;
122 };
123
macsec_priv(const struct net_device * dev)124 static struct macsec_dev *macsec_priv(const struct net_device *dev)
125 {
126 return (struct macsec_dev *)netdev_priv(dev);
127 }
128
macsec_data_rcu(const struct net_device * dev)129 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
130 {
131 return rcu_dereference_bh(dev->rx_handler_data);
132 }
133
macsec_data_rtnl(const struct net_device * dev)134 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
135 {
136 return rtnl_dereference(dev->rx_handler_data);
137 }
138
139 struct macsec_cb {
140 struct aead_request *req;
141 union {
142 struct macsec_tx_sa *tx_sa;
143 struct macsec_rx_sa *rx_sa;
144 };
145 u8 assoc_num;
146 bool valid;
147 bool has_sci;
148 };
149
macsec_rxsa_get(struct macsec_rx_sa __rcu * ptr)150 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
151 {
152 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
153
154 if (!sa || !sa->active)
155 return NULL;
156
157 if (!refcount_inc_not_zero(&sa->refcnt))
158 return NULL;
159
160 return sa;
161 }
162
free_rx_sc_rcu(struct rcu_head * head)163 static void free_rx_sc_rcu(struct rcu_head *head)
164 {
165 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
166
167 free_percpu(rx_sc->stats);
168 kfree(rx_sc);
169 }
170
macsec_rxsc_get(struct macsec_rx_sc * sc)171 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
172 {
173 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
174 }
175
macsec_rxsc_put(struct macsec_rx_sc * sc)176 static void macsec_rxsc_put(struct macsec_rx_sc *sc)
177 {
178 if (refcount_dec_and_test(&sc->refcnt))
179 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
180 }
181
free_rxsa(struct rcu_head * head)182 static void free_rxsa(struct rcu_head *head)
183 {
184 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
185
186 crypto_free_aead(sa->key.tfm);
187 free_percpu(sa->stats);
188 kfree(sa);
189 }
190
macsec_rxsa_put(struct macsec_rx_sa * sa)191 static void macsec_rxsa_put(struct macsec_rx_sa *sa)
192 {
193 if (refcount_dec_and_test(&sa->refcnt))
194 call_rcu(&sa->rcu, free_rxsa);
195 }
196
macsec_txsa_get(struct macsec_tx_sa __rcu * ptr)197 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
198 {
199 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
200
201 if (!sa || !sa->active)
202 return NULL;
203
204 if (!refcount_inc_not_zero(&sa->refcnt))
205 return NULL;
206
207 return sa;
208 }
209
free_txsa(struct rcu_head * head)210 static void free_txsa(struct rcu_head *head)
211 {
212 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
213
214 crypto_free_aead(sa->key.tfm);
215 free_percpu(sa->stats);
216 kfree(sa);
217 }
218
macsec_txsa_put(struct macsec_tx_sa * sa)219 static void macsec_txsa_put(struct macsec_tx_sa *sa)
220 {
221 if (refcount_dec_and_test(&sa->refcnt))
222 call_rcu(&sa->rcu, free_txsa);
223 }
224
macsec_skb_cb(struct sk_buff * skb)225 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
226 {
227 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
228 return (struct macsec_cb *)skb->cb;
229 }
230
231 #define MACSEC_PORT_ES (htons(0x0001))
232 #define MACSEC_PORT_SCB (0x0000)
233 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
234 #define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
235
236 #define MACSEC_GCM_AES_128_SAK_LEN 16
237 #define MACSEC_GCM_AES_256_SAK_LEN 32
238
239 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
240 #define DEFAULT_XPN false
241 #define DEFAULT_SEND_SCI true
242 #define DEFAULT_ENCRYPT false
243 #define DEFAULT_ENCODING_SA 0
244 #define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1))
245
send_sci(const struct macsec_secy * secy)246 static bool send_sci(const struct macsec_secy *secy)
247 {
248 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
249
250 return tx_sc->send_sci ||
251 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
252 }
253
make_sci(u8 * addr,__be16 port)254 static sci_t make_sci(u8 *addr, __be16 port)
255 {
256 sci_t sci;
257
258 memcpy(&sci, addr, ETH_ALEN);
259 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
260
261 return sci;
262 }
263
macsec_frame_sci(struct macsec_eth_header * hdr,bool sci_present)264 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
265 {
266 sci_t sci;
267
268 if (sci_present)
269 memcpy(&sci, hdr->secure_channel_id,
270 sizeof(hdr->secure_channel_id));
271 else
272 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
273
274 return sci;
275 }
276
macsec_sectag_len(bool sci_present)277 static unsigned int macsec_sectag_len(bool sci_present)
278 {
279 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
280 }
281
macsec_hdr_len(bool sci_present)282 static unsigned int macsec_hdr_len(bool sci_present)
283 {
284 return macsec_sectag_len(sci_present) + ETH_HLEN;
285 }
286
macsec_extra_len(bool sci_present)287 static unsigned int macsec_extra_len(bool sci_present)
288 {
289 return macsec_sectag_len(sci_present) + sizeof(__be16);
290 }
291
292 /* 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)293 static void macsec_fill_sectag(struct macsec_eth_header *h,
294 const struct macsec_secy *secy, u32 pn,
295 bool sci_present)
296 {
297 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
298
299 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
300 h->eth.h_proto = htons(ETH_P_MACSEC);
301
302 if (sci_present) {
303 h->tci_an |= MACSEC_TCI_SC;
304 memcpy(&h->secure_channel_id, &secy->sci,
305 sizeof(h->secure_channel_id));
306 } else {
307 if (tx_sc->end_station)
308 h->tci_an |= MACSEC_TCI_ES;
309 if (tx_sc->scb)
310 h->tci_an |= MACSEC_TCI_SCB;
311 }
312
313 h->packet_number = htonl(pn);
314
315 /* with GCM, C/E clear for !encrypt, both set for encrypt */
316 if (tx_sc->encrypt)
317 h->tci_an |= MACSEC_TCI_CONFID;
318 else if (secy->icv_len != DEFAULT_ICV_LEN)
319 h->tci_an |= MACSEC_TCI_C;
320
321 h->tci_an |= tx_sc->encoding_sa;
322 }
323
macsec_set_shortlen(struct macsec_eth_header * h,size_t data_len)324 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
325 {
326 if (data_len < MIN_NON_SHORT_LEN)
327 h->short_length = data_len;
328 }
329
330 /* Checks if a MACsec interface is being offloaded to an hardware engine */
macsec_is_offloaded(struct macsec_dev * macsec)331 static bool macsec_is_offloaded(struct macsec_dev *macsec)
332 {
333 if (macsec->offload == MACSEC_OFFLOAD_MAC ||
334 macsec->offload == MACSEC_OFFLOAD_PHY)
335 return true;
336
337 return false;
338 }
339
340 /* Checks if underlying layers implement MACsec offloading functions. */
macsec_check_offload(enum macsec_offload offload,struct macsec_dev * macsec)341 static bool macsec_check_offload(enum macsec_offload offload,
342 struct macsec_dev *macsec)
343 {
344 if (!macsec || !macsec->real_dev)
345 return false;
346
347 if (offload == MACSEC_OFFLOAD_PHY)
348 return macsec->real_dev->phydev &&
349 macsec->real_dev->phydev->macsec_ops;
350 else if (offload == MACSEC_OFFLOAD_MAC)
351 return macsec->real_dev->features & NETIF_F_HW_MACSEC &&
352 macsec->real_dev->macsec_ops;
353
354 return false;
355 }
356
__macsec_get_ops(enum macsec_offload offload,struct macsec_dev * macsec,struct macsec_context * ctx)357 static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload,
358 struct macsec_dev *macsec,
359 struct macsec_context *ctx)
360 {
361 if (ctx) {
362 memset(ctx, 0, sizeof(*ctx));
363 ctx->offload = offload;
364
365 if (offload == MACSEC_OFFLOAD_PHY)
366 ctx->phydev = macsec->real_dev->phydev;
367 else if (offload == MACSEC_OFFLOAD_MAC)
368 ctx->netdev = macsec->real_dev;
369 }
370
371 if (offload == MACSEC_OFFLOAD_PHY)
372 return macsec->real_dev->phydev->macsec_ops;
373 else
374 return macsec->real_dev->macsec_ops;
375 }
376
377 /* Returns a pointer to the MACsec ops struct if any and updates the MACsec
378 * context device reference if provided.
379 */
macsec_get_ops(struct macsec_dev * macsec,struct macsec_context * ctx)380 static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
381 struct macsec_context *ctx)
382 {
383 if (!macsec_check_offload(macsec->offload, macsec))
384 return NULL;
385
386 return __macsec_get_ops(macsec->offload, macsec, ctx);
387 }
388
389 /* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */
macsec_validate_skb(struct sk_buff * skb,u16 icv_len,bool xpn)390 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn)
391 {
392 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
393 int len = skb->len - 2 * ETH_ALEN;
394 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
395
396 /* a) It comprises at least 17 octets */
397 if (skb->len <= 16)
398 return false;
399
400 /* b) MACsec EtherType: already checked */
401
402 /* c) V bit is clear */
403 if (h->tci_an & MACSEC_TCI_VERSION)
404 return false;
405
406 /* d) ES or SCB => !SC */
407 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
408 (h->tci_an & MACSEC_TCI_SC))
409 return false;
410
411 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
412 if (h->unused)
413 return false;
414
415 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */
416 if (!h->packet_number && !xpn)
417 return false;
418
419 /* length check, f) g) h) i) */
420 if (h->short_length)
421 return len == extra_len + h->short_length;
422 return len >= extra_len + MIN_NON_SHORT_LEN;
423 }
424
425 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
426 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
427
macsec_fill_iv_xpn(unsigned char * iv,ssci_t ssci,u64 pn,salt_t salt)428 static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn,
429 salt_t salt)
430 {
431 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv;
432
433 gcm_iv->ssci = ssci ^ salt.ssci;
434 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn;
435 }
436
macsec_fill_iv(unsigned char * iv,sci_t sci,u32 pn)437 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
438 {
439 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
440
441 gcm_iv->sci = sci;
442 gcm_iv->pn = htonl(pn);
443 }
444
macsec_ethhdr(struct sk_buff * skb)445 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
446 {
447 return (struct macsec_eth_header *)skb_mac_header(skb);
448 }
449
__macsec_pn_wrapped(struct macsec_secy * secy,struct macsec_tx_sa * tx_sa)450 static void __macsec_pn_wrapped(struct macsec_secy *secy,
451 struct macsec_tx_sa *tx_sa)
452 {
453 pr_debug("PN wrapped, transitioning to !oper\n");
454 tx_sa->active = false;
455 if (secy->protect_frames)
456 secy->operational = false;
457 }
458
macsec_pn_wrapped(struct macsec_secy * secy,struct macsec_tx_sa * tx_sa)459 void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
460 {
461 spin_lock_bh(&tx_sa->lock);
462 __macsec_pn_wrapped(secy, tx_sa);
463 spin_unlock_bh(&tx_sa->lock);
464 }
465 EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
466
tx_sa_update_pn(struct macsec_tx_sa * tx_sa,struct macsec_secy * secy)467 static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
468 struct macsec_secy *secy)
469 {
470 pn_t pn;
471
472 spin_lock_bh(&tx_sa->lock);
473
474 pn = tx_sa->next_pn_halves;
475 if (secy->xpn)
476 tx_sa->next_pn++;
477 else
478 tx_sa->next_pn_halves.lower++;
479
480 if (tx_sa->next_pn == 0)
481 __macsec_pn_wrapped(secy, tx_sa);
482 spin_unlock_bh(&tx_sa->lock);
483
484 return pn;
485 }
486
macsec_encrypt_finish(struct sk_buff * skb,struct net_device * dev)487 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
488 {
489 struct macsec_dev *macsec = netdev_priv(dev);
490
491 skb->dev = macsec->real_dev;
492 skb_reset_mac_header(skb);
493 skb->protocol = eth_hdr(skb)->h_proto;
494 }
495
macsec_count_tx(struct sk_buff * skb,struct macsec_tx_sc * tx_sc,struct macsec_tx_sa * tx_sa)496 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
497 struct macsec_tx_sa *tx_sa)
498 {
499 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
500
501 u64_stats_update_begin(&txsc_stats->syncp);
502 if (tx_sc->encrypt) {
503 txsc_stats->stats.OutOctetsEncrypted += skb->len;
504 txsc_stats->stats.OutPktsEncrypted++;
505 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
506 } else {
507 txsc_stats->stats.OutOctetsProtected += skb->len;
508 txsc_stats->stats.OutPktsProtected++;
509 this_cpu_inc(tx_sa->stats->OutPktsProtected);
510 }
511 u64_stats_update_end(&txsc_stats->syncp);
512 }
513
count_tx(struct net_device * dev,int ret,int len)514 static void count_tx(struct net_device *dev, int ret, int len)
515 {
516 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
517 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
518
519 u64_stats_update_begin(&stats->syncp);
520 stats->tx_packets++;
521 stats->tx_bytes += len;
522 u64_stats_update_end(&stats->syncp);
523 }
524 }
525
macsec_encrypt_done(struct crypto_async_request * base,int err)526 static void macsec_encrypt_done(struct crypto_async_request *base, int err)
527 {
528 struct sk_buff *skb = base->data;
529 struct net_device *dev = skb->dev;
530 struct macsec_dev *macsec = macsec_priv(dev);
531 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
532 int len, ret;
533
534 aead_request_free(macsec_skb_cb(skb)->req);
535
536 rcu_read_lock_bh();
537 macsec_encrypt_finish(skb, dev);
538 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
539 len = skb->len;
540 ret = dev_queue_xmit(skb);
541 count_tx(dev, ret, len);
542 rcu_read_unlock_bh();
543
544 macsec_txsa_put(sa);
545 dev_put(dev);
546 }
547
macsec_alloc_req(struct crypto_aead * tfm,unsigned char ** iv,struct scatterlist ** sg,int num_frags)548 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
549 unsigned char **iv,
550 struct scatterlist **sg,
551 int num_frags)
552 {
553 size_t size, iv_offset, sg_offset;
554 struct aead_request *req;
555 void *tmp;
556
557 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
558 iv_offset = size;
559 size += GCM_AES_IV_LEN;
560
561 size = ALIGN(size, __alignof__(struct scatterlist));
562 sg_offset = size;
563 size += sizeof(struct scatterlist) * num_frags;
564
565 tmp = kmalloc(size, GFP_ATOMIC);
566 if (!tmp)
567 return NULL;
568
569 *iv = (unsigned char *)(tmp + iv_offset);
570 *sg = (struct scatterlist *)(tmp + sg_offset);
571 req = tmp;
572
573 aead_request_set_tfm(req, tfm);
574
575 return req;
576 }
577
macsec_encrypt(struct sk_buff * skb,struct net_device * dev)578 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
579 struct net_device *dev)
580 {
581 int ret;
582 struct scatterlist *sg;
583 struct sk_buff *trailer;
584 unsigned char *iv;
585 struct ethhdr *eth;
586 struct macsec_eth_header *hh;
587 size_t unprotected_len;
588 struct aead_request *req;
589 struct macsec_secy *secy;
590 struct macsec_tx_sc *tx_sc;
591 struct macsec_tx_sa *tx_sa;
592 struct macsec_dev *macsec = macsec_priv(dev);
593 bool sci_present;
594 pn_t pn;
595
596 secy = &macsec->secy;
597 tx_sc = &secy->tx_sc;
598
599 /* 10.5.1 TX SA assignment */
600 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
601 if (!tx_sa) {
602 secy->operational = false;
603 kfree_skb(skb);
604 return ERR_PTR(-EINVAL);
605 }
606
607 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
608 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
609 struct sk_buff *nskb = skb_copy_expand(skb,
610 MACSEC_NEEDED_HEADROOM,
611 MACSEC_NEEDED_TAILROOM,
612 GFP_ATOMIC);
613 if (likely(nskb)) {
614 consume_skb(skb);
615 skb = nskb;
616 } else {
617 macsec_txsa_put(tx_sa);
618 kfree_skb(skb);
619 return ERR_PTR(-ENOMEM);
620 }
621 } else {
622 skb = skb_unshare(skb, GFP_ATOMIC);
623 if (!skb) {
624 macsec_txsa_put(tx_sa);
625 return ERR_PTR(-ENOMEM);
626 }
627 }
628
629 unprotected_len = skb->len;
630 eth = eth_hdr(skb);
631 sci_present = send_sci(secy);
632 hh = skb_push(skb, macsec_extra_len(sci_present));
633 memmove(hh, eth, 2 * ETH_ALEN);
634
635 pn = tx_sa_update_pn(tx_sa, secy);
636 if (pn.full64 == 0) {
637 macsec_txsa_put(tx_sa);
638 kfree_skb(skb);
639 return ERR_PTR(-ENOLINK);
640 }
641 macsec_fill_sectag(hh, secy, pn.lower, sci_present);
642 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
643
644 skb_put(skb, secy->icv_len);
645
646 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
647 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
648
649 u64_stats_update_begin(&secy_stats->syncp);
650 secy_stats->stats.OutPktsTooLong++;
651 u64_stats_update_end(&secy_stats->syncp);
652
653 macsec_txsa_put(tx_sa);
654 kfree_skb(skb);
655 return ERR_PTR(-EINVAL);
656 }
657
658 ret = skb_cow_data(skb, 0, &trailer);
659 if (unlikely(ret < 0)) {
660 macsec_txsa_put(tx_sa);
661 kfree_skb(skb);
662 return ERR_PTR(ret);
663 }
664
665 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
666 if (!req) {
667 macsec_txsa_put(tx_sa);
668 kfree_skb(skb);
669 return ERR_PTR(-ENOMEM);
670 }
671
672 if (secy->xpn)
673 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt);
674 else
675 macsec_fill_iv(iv, secy->sci, pn.lower);
676
677 sg_init_table(sg, ret);
678 ret = skb_to_sgvec(skb, sg, 0, skb->len);
679 if (unlikely(ret < 0)) {
680 aead_request_free(req);
681 macsec_txsa_put(tx_sa);
682 kfree_skb(skb);
683 return ERR_PTR(ret);
684 }
685
686 if (tx_sc->encrypt) {
687 int len = skb->len - macsec_hdr_len(sci_present) -
688 secy->icv_len;
689 aead_request_set_crypt(req, sg, sg, len, iv);
690 aead_request_set_ad(req, macsec_hdr_len(sci_present));
691 } else {
692 aead_request_set_crypt(req, sg, sg, 0, iv);
693 aead_request_set_ad(req, skb->len - secy->icv_len);
694 }
695
696 macsec_skb_cb(skb)->req = req;
697 macsec_skb_cb(skb)->tx_sa = tx_sa;
698 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
699
700 dev_hold(skb->dev);
701 ret = crypto_aead_encrypt(req);
702 if (ret == -EINPROGRESS) {
703 return ERR_PTR(ret);
704 } else if (ret != 0) {
705 dev_put(skb->dev);
706 kfree_skb(skb);
707 aead_request_free(req);
708 macsec_txsa_put(tx_sa);
709 return ERR_PTR(-EINVAL);
710 }
711
712 dev_put(skb->dev);
713 aead_request_free(req);
714 macsec_txsa_put(tx_sa);
715
716 return skb;
717 }
718
macsec_post_decrypt(struct sk_buff * skb,struct macsec_secy * secy,u32 pn)719 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
720 {
721 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
722 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
723 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
724 u32 lowest_pn = 0;
725
726 spin_lock(&rx_sa->lock);
727 if (rx_sa->next_pn_halves.lower >= secy->replay_window)
728 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
729
730 /* Now perform replay protection check again
731 * (see IEEE 802.1AE-2006 figure 10-5)
732 */
733 if (secy->replay_protect && pn < lowest_pn &&
734 (!secy->xpn || pn_same_half(pn, lowest_pn))) {
735 spin_unlock(&rx_sa->lock);
736 u64_stats_update_begin(&rxsc_stats->syncp);
737 rxsc_stats->stats.InPktsLate++;
738 u64_stats_update_end(&rxsc_stats->syncp);
739 return false;
740 }
741
742 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
743 u64_stats_update_begin(&rxsc_stats->syncp);
744 if (hdr->tci_an & MACSEC_TCI_E)
745 rxsc_stats->stats.InOctetsDecrypted += skb->len;
746 else
747 rxsc_stats->stats.InOctetsValidated += skb->len;
748 u64_stats_update_end(&rxsc_stats->syncp);
749 }
750
751 if (!macsec_skb_cb(skb)->valid) {
752 spin_unlock(&rx_sa->lock);
753
754 /* 10.6.5 */
755 if (hdr->tci_an & MACSEC_TCI_C ||
756 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
757 u64_stats_update_begin(&rxsc_stats->syncp);
758 rxsc_stats->stats.InPktsNotValid++;
759 u64_stats_update_end(&rxsc_stats->syncp);
760 return false;
761 }
762
763 u64_stats_update_begin(&rxsc_stats->syncp);
764 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
765 rxsc_stats->stats.InPktsInvalid++;
766 this_cpu_inc(rx_sa->stats->InPktsInvalid);
767 } else if (pn < lowest_pn) {
768 rxsc_stats->stats.InPktsDelayed++;
769 } else {
770 rxsc_stats->stats.InPktsUnchecked++;
771 }
772 u64_stats_update_end(&rxsc_stats->syncp);
773 } else {
774 u64_stats_update_begin(&rxsc_stats->syncp);
775 if (pn < lowest_pn) {
776 rxsc_stats->stats.InPktsDelayed++;
777 } else {
778 rxsc_stats->stats.InPktsOK++;
779 this_cpu_inc(rx_sa->stats->InPktsOK);
780 }
781 u64_stats_update_end(&rxsc_stats->syncp);
782
783 // Instead of "pn >=" - to support pn overflow in xpn
784 if (pn + 1 > rx_sa->next_pn_halves.lower) {
785 rx_sa->next_pn_halves.lower = pn + 1;
786 } else if (secy->xpn &&
787 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
788 rx_sa->next_pn_halves.upper++;
789 rx_sa->next_pn_halves.lower = pn + 1;
790 }
791
792 spin_unlock(&rx_sa->lock);
793 }
794
795 return true;
796 }
797
macsec_reset_skb(struct sk_buff * skb,struct net_device * dev)798 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
799 {
800 skb->pkt_type = PACKET_HOST;
801 skb->protocol = eth_type_trans(skb, dev);
802
803 skb_reset_network_header(skb);
804 if (!skb_transport_header_was_set(skb))
805 skb_reset_transport_header(skb);
806 skb_reset_mac_len(skb);
807 }
808
macsec_finalize_skb(struct sk_buff * skb,u8 icv_len,u8 hdr_len)809 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
810 {
811 skb->ip_summed = CHECKSUM_NONE;
812 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
813 skb_pull(skb, hdr_len);
814 pskb_trim_unique(skb, skb->len - icv_len);
815 }
816
count_rx(struct net_device * dev,int len)817 static void count_rx(struct net_device *dev, int len)
818 {
819 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
820
821 u64_stats_update_begin(&stats->syncp);
822 stats->rx_packets++;
823 stats->rx_bytes += len;
824 u64_stats_update_end(&stats->syncp);
825 }
826
macsec_decrypt_done(struct crypto_async_request * base,int err)827 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
828 {
829 struct sk_buff *skb = base->data;
830 struct net_device *dev = skb->dev;
831 struct macsec_dev *macsec = macsec_priv(dev);
832 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
833 struct macsec_rx_sc *rx_sc = rx_sa->sc;
834 int len;
835 u32 pn;
836
837 aead_request_free(macsec_skb_cb(skb)->req);
838
839 if (!err)
840 macsec_skb_cb(skb)->valid = true;
841
842 rcu_read_lock_bh();
843 pn = ntohl(macsec_ethhdr(skb)->packet_number);
844 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
845 rcu_read_unlock_bh();
846 kfree_skb(skb);
847 goto out;
848 }
849
850 macsec_finalize_skb(skb, macsec->secy.icv_len,
851 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
852 macsec_reset_skb(skb, macsec->secy.netdev);
853
854 len = skb->len;
855 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
856 count_rx(dev, len);
857
858 rcu_read_unlock_bh();
859
860 out:
861 macsec_rxsa_put(rx_sa);
862 macsec_rxsc_put(rx_sc);
863 dev_put(dev);
864 }
865
macsec_decrypt(struct sk_buff * skb,struct net_device * dev,struct macsec_rx_sa * rx_sa,sci_t sci,struct macsec_secy * secy)866 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
867 struct net_device *dev,
868 struct macsec_rx_sa *rx_sa,
869 sci_t sci,
870 struct macsec_secy *secy)
871 {
872 int ret;
873 struct scatterlist *sg;
874 struct sk_buff *trailer;
875 unsigned char *iv;
876 struct aead_request *req;
877 struct macsec_eth_header *hdr;
878 u32 hdr_pn;
879 u16 icv_len = secy->icv_len;
880
881 macsec_skb_cb(skb)->valid = false;
882 skb = skb_share_check(skb, GFP_ATOMIC);
883 if (!skb)
884 return ERR_PTR(-ENOMEM);
885
886 ret = skb_cow_data(skb, 0, &trailer);
887 if (unlikely(ret < 0)) {
888 kfree_skb(skb);
889 return ERR_PTR(ret);
890 }
891 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
892 if (!req) {
893 kfree_skb(skb);
894 return ERR_PTR(-ENOMEM);
895 }
896
897 hdr = (struct macsec_eth_header *)skb->data;
898 hdr_pn = ntohl(hdr->packet_number);
899
900 if (secy->xpn) {
901 pn_t recovered_pn = rx_sa->next_pn_halves;
902
903 recovered_pn.lower = hdr_pn;
904 if (hdr_pn < rx_sa->next_pn_halves.lower &&
905 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
906 recovered_pn.upper++;
907
908 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
909 rx_sa->key.salt);
910 } else {
911 macsec_fill_iv(iv, sci, hdr_pn);
912 }
913
914 sg_init_table(sg, ret);
915 ret = skb_to_sgvec(skb, sg, 0, skb->len);
916 if (unlikely(ret < 0)) {
917 aead_request_free(req);
918 kfree_skb(skb);
919 return ERR_PTR(ret);
920 }
921
922 if (hdr->tci_an & MACSEC_TCI_E) {
923 /* confidentiality: ethernet + macsec header
924 * authenticated, encrypted payload
925 */
926 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
927
928 aead_request_set_crypt(req, sg, sg, len, iv);
929 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
930 skb = skb_unshare(skb, GFP_ATOMIC);
931 if (!skb) {
932 aead_request_free(req);
933 return ERR_PTR(-ENOMEM);
934 }
935 } else {
936 /* integrity only: all headers + data authenticated */
937 aead_request_set_crypt(req, sg, sg, icv_len, iv);
938 aead_request_set_ad(req, skb->len - icv_len);
939 }
940
941 macsec_skb_cb(skb)->req = req;
942 skb->dev = dev;
943 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
944
945 dev_hold(dev);
946 ret = crypto_aead_decrypt(req);
947 if (ret == -EINPROGRESS) {
948 return ERR_PTR(ret);
949 } else if (ret != 0) {
950 /* decryption/authentication failed
951 * 10.6 if validateFrames is disabled, deliver anyway
952 */
953 if (ret != -EBADMSG) {
954 kfree_skb(skb);
955 skb = ERR_PTR(ret);
956 }
957 } else {
958 macsec_skb_cb(skb)->valid = true;
959 }
960 dev_put(dev);
961
962 aead_request_free(req);
963
964 return skb;
965 }
966
find_rx_sc(struct macsec_secy * secy,sci_t sci)967 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
968 {
969 struct macsec_rx_sc *rx_sc;
970
971 for_each_rxsc(secy, rx_sc) {
972 if (rx_sc->sci == sci)
973 return rx_sc;
974 }
975
976 return NULL;
977 }
978
find_rx_sc_rtnl(struct macsec_secy * secy,sci_t sci)979 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
980 {
981 struct macsec_rx_sc *rx_sc;
982
983 for_each_rxsc_rtnl(secy, rx_sc) {
984 if (rx_sc->sci == sci)
985 return rx_sc;
986 }
987
988 return NULL;
989 }
990
handle_not_macsec(struct sk_buff * skb)991 static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
992 {
993 /* Deliver to the uncontrolled port by default */
994 enum rx_handler_result ret = RX_HANDLER_PASS;
995 struct ethhdr *hdr = eth_hdr(skb);
996 struct macsec_rxh_data *rxd;
997 struct macsec_dev *macsec;
998
999 rcu_read_lock();
1000 rxd = macsec_data_rcu(skb->dev);
1001
1002 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1003 struct sk_buff *nskb;
1004 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1005 struct net_device *ndev = macsec->secy.netdev;
1006
1007 /* If h/w offloading is enabled, HW decodes frames and strips
1008 * the SecTAG, so we have to deduce which port to deliver to.
1009 */
1010 if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
1011 if (ether_addr_equal_64bits(hdr->h_dest,
1012 ndev->dev_addr)) {
1013 /* exact match, divert skb to this port */
1014 skb->dev = ndev;
1015 skb->pkt_type = PACKET_HOST;
1016 ret = RX_HANDLER_ANOTHER;
1017 goto out;
1018 } else if (is_multicast_ether_addr_64bits(
1019 hdr->h_dest)) {
1020 /* multicast frame, deliver on this port too */
1021 nskb = skb_clone(skb, GFP_ATOMIC);
1022 if (!nskb)
1023 break;
1024
1025 nskb->dev = ndev;
1026 if (ether_addr_equal_64bits(hdr->h_dest,
1027 ndev->broadcast))
1028 nskb->pkt_type = PACKET_BROADCAST;
1029 else
1030 nskb->pkt_type = PACKET_MULTICAST;
1031
1032 netif_rx(nskb);
1033 }
1034 continue;
1035 }
1036
1037 /* 10.6 If the management control validateFrames is not
1038 * Strict, frames without a SecTAG are received, counted, and
1039 * delivered to the Controlled Port
1040 */
1041 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1042 u64_stats_update_begin(&secy_stats->syncp);
1043 secy_stats->stats.InPktsNoTag++;
1044 u64_stats_update_end(&secy_stats->syncp);
1045 continue;
1046 }
1047
1048 /* deliver on this port */
1049 nskb = skb_clone(skb, GFP_ATOMIC);
1050 if (!nskb)
1051 break;
1052
1053 nskb->dev = ndev;
1054
1055 if (netif_rx(nskb) == NET_RX_SUCCESS) {
1056 u64_stats_update_begin(&secy_stats->syncp);
1057 secy_stats->stats.InPktsUntagged++;
1058 u64_stats_update_end(&secy_stats->syncp);
1059 }
1060 }
1061
1062 out:
1063 rcu_read_unlock();
1064 return ret;
1065 }
1066
macsec_handle_frame(struct sk_buff ** pskb)1067 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1068 {
1069 struct sk_buff *skb = *pskb;
1070 struct net_device *dev = skb->dev;
1071 struct macsec_eth_header *hdr;
1072 struct macsec_secy *secy = NULL;
1073 struct macsec_rx_sc *rx_sc;
1074 struct macsec_rx_sa *rx_sa;
1075 struct macsec_rxh_data *rxd;
1076 struct macsec_dev *macsec;
1077 unsigned int len;
1078 sci_t sci;
1079 u32 hdr_pn;
1080 bool cbit;
1081 struct pcpu_rx_sc_stats *rxsc_stats;
1082 struct pcpu_secy_stats *secy_stats;
1083 bool pulled_sci;
1084 int ret;
1085
1086 if (skb_headroom(skb) < ETH_HLEN)
1087 goto drop_direct;
1088
1089 hdr = macsec_ethhdr(skb);
1090 if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
1091 return handle_not_macsec(skb);
1092
1093 skb = skb_unshare(skb, GFP_ATOMIC);
1094 *pskb = skb;
1095 if (!skb)
1096 return RX_HANDLER_CONSUMED;
1097
1098 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1099 if (!pulled_sci) {
1100 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1101 goto drop_direct;
1102 }
1103
1104 hdr = macsec_ethhdr(skb);
1105
1106 /* Frames with a SecTAG that has the TCI E bit set but the C
1107 * bit clear are discarded, as this reserved encoding is used
1108 * to identify frames with a SecTAG that are not to be
1109 * delivered to the Controlled Port.
1110 */
1111 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1112 return RX_HANDLER_PASS;
1113
1114 /* now, pull the extra length */
1115 if (hdr->tci_an & MACSEC_TCI_SC) {
1116 if (!pulled_sci)
1117 goto drop_direct;
1118 }
1119
1120 /* ethernet header is part of crypto processing */
1121 skb_push(skb, ETH_HLEN);
1122
1123 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1124 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1125 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1126
1127 rcu_read_lock();
1128 rxd = macsec_data_rcu(skb->dev);
1129
1130 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1131 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1132
1133 sc = sc ? macsec_rxsc_get(sc) : NULL;
1134
1135 if (sc) {
1136 secy = &macsec->secy;
1137 rx_sc = sc;
1138 break;
1139 }
1140 }
1141
1142 if (!secy)
1143 goto nosci;
1144
1145 dev = secy->netdev;
1146 macsec = macsec_priv(dev);
1147 secy_stats = this_cpu_ptr(macsec->stats);
1148 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1149
1150 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
1151 u64_stats_update_begin(&secy_stats->syncp);
1152 secy_stats->stats.InPktsBadTag++;
1153 u64_stats_update_end(&secy_stats->syncp);
1154 goto drop_nosa;
1155 }
1156
1157 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1158 if (!rx_sa) {
1159 /* 10.6.1 if the SA is not in use */
1160
1161 /* If validateFrames is Strict or the C bit in the
1162 * SecTAG is set, discard
1163 */
1164 if (hdr->tci_an & MACSEC_TCI_C ||
1165 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1166 u64_stats_update_begin(&rxsc_stats->syncp);
1167 rxsc_stats->stats.InPktsNotUsingSA++;
1168 u64_stats_update_end(&rxsc_stats->syncp);
1169 goto drop_nosa;
1170 }
1171
1172 /* not Strict, the frame (with the SecTAG and ICV
1173 * removed) is delivered to the Controlled Port.
1174 */
1175 u64_stats_update_begin(&rxsc_stats->syncp);
1176 rxsc_stats->stats.InPktsUnusedSA++;
1177 u64_stats_update_end(&rxsc_stats->syncp);
1178 goto deliver;
1179 }
1180
1181 /* First, PN check to avoid decrypting obviously wrong packets */
1182 hdr_pn = ntohl(hdr->packet_number);
1183 if (secy->replay_protect) {
1184 bool late;
1185
1186 spin_lock(&rx_sa->lock);
1187 late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
1188 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
1189
1190 if (secy->xpn)
1191 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
1192 spin_unlock(&rx_sa->lock);
1193
1194 if (late) {
1195 u64_stats_update_begin(&rxsc_stats->syncp);
1196 rxsc_stats->stats.InPktsLate++;
1197 u64_stats_update_end(&rxsc_stats->syncp);
1198 goto drop;
1199 }
1200 }
1201
1202 macsec_skb_cb(skb)->rx_sa = rx_sa;
1203
1204 /* Disabled && !changed text => skip validation */
1205 if (hdr->tci_an & MACSEC_TCI_C ||
1206 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1207 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1208
1209 if (IS_ERR(skb)) {
1210 /* the decrypt callback needs the reference */
1211 if (PTR_ERR(skb) != -EINPROGRESS) {
1212 macsec_rxsa_put(rx_sa);
1213 macsec_rxsc_put(rx_sc);
1214 }
1215 rcu_read_unlock();
1216 *pskb = NULL;
1217 return RX_HANDLER_CONSUMED;
1218 }
1219
1220 if (!macsec_post_decrypt(skb, secy, hdr_pn))
1221 goto drop;
1222
1223 deliver:
1224 macsec_finalize_skb(skb, secy->icv_len,
1225 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1226 macsec_reset_skb(skb, secy->netdev);
1227
1228 if (rx_sa)
1229 macsec_rxsa_put(rx_sa);
1230 macsec_rxsc_put(rx_sc);
1231
1232 skb_orphan(skb);
1233 len = skb->len;
1234 ret = gro_cells_receive(&macsec->gro_cells, skb);
1235 if (ret == NET_RX_SUCCESS)
1236 count_rx(dev, len);
1237 else
1238 macsec->secy.netdev->stats.rx_dropped++;
1239
1240 rcu_read_unlock();
1241
1242 *pskb = NULL;
1243 return RX_HANDLER_CONSUMED;
1244
1245 drop:
1246 macsec_rxsa_put(rx_sa);
1247 drop_nosa:
1248 macsec_rxsc_put(rx_sc);
1249 rcu_read_unlock();
1250 drop_direct:
1251 kfree_skb(skb);
1252 *pskb = NULL;
1253 return RX_HANDLER_CONSUMED;
1254
1255 nosci:
1256 /* 10.6.1 if the SC is not found */
1257 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1258 if (!cbit)
1259 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1260 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1261
1262 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1263 struct sk_buff *nskb;
1264
1265 secy_stats = this_cpu_ptr(macsec->stats);
1266
1267 /* If validateFrames is Strict or the C bit in the
1268 * SecTAG is set, discard
1269 */
1270 if (cbit ||
1271 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1272 u64_stats_update_begin(&secy_stats->syncp);
1273 secy_stats->stats.InPktsNoSCI++;
1274 u64_stats_update_end(&secy_stats->syncp);
1275 continue;
1276 }
1277
1278 /* not strict, the frame (with the SecTAG and ICV
1279 * removed) is delivered to the Controlled Port.
1280 */
1281 nskb = skb_clone(skb, GFP_ATOMIC);
1282 if (!nskb)
1283 break;
1284
1285 macsec_reset_skb(nskb, macsec->secy.netdev);
1286
1287 ret = netif_rx(nskb);
1288 if (ret == NET_RX_SUCCESS) {
1289 u64_stats_update_begin(&secy_stats->syncp);
1290 secy_stats->stats.InPktsUnknownSCI++;
1291 u64_stats_update_end(&secy_stats->syncp);
1292 } else {
1293 macsec->secy.netdev->stats.rx_dropped++;
1294 }
1295 }
1296
1297 rcu_read_unlock();
1298 *pskb = skb;
1299 return RX_HANDLER_PASS;
1300 }
1301
macsec_alloc_tfm(char * key,int key_len,int icv_len)1302 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1303 {
1304 struct crypto_aead *tfm;
1305 int ret;
1306
1307 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1308
1309 if (IS_ERR(tfm))
1310 return tfm;
1311
1312 ret = crypto_aead_setkey(tfm, key, key_len);
1313 if (ret < 0)
1314 goto fail;
1315
1316 ret = crypto_aead_setauthsize(tfm, icv_len);
1317 if (ret < 0)
1318 goto fail;
1319
1320 return tfm;
1321 fail:
1322 crypto_free_aead(tfm);
1323 return ERR_PTR(ret);
1324 }
1325
init_rx_sa(struct macsec_rx_sa * rx_sa,char * sak,int key_len,int icv_len)1326 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1327 int icv_len)
1328 {
1329 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1330 if (!rx_sa->stats)
1331 return -ENOMEM;
1332
1333 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1334 if (IS_ERR(rx_sa->key.tfm)) {
1335 free_percpu(rx_sa->stats);
1336 return PTR_ERR(rx_sa->key.tfm);
1337 }
1338
1339 rx_sa->ssci = MACSEC_UNDEF_SSCI;
1340 rx_sa->active = false;
1341 rx_sa->next_pn = 1;
1342 refcount_set(&rx_sa->refcnt, 1);
1343 spin_lock_init(&rx_sa->lock);
1344
1345 return 0;
1346 }
1347
clear_rx_sa(struct macsec_rx_sa * rx_sa)1348 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1349 {
1350 rx_sa->active = false;
1351
1352 macsec_rxsa_put(rx_sa);
1353 }
1354
free_rx_sc(struct macsec_rx_sc * rx_sc)1355 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1356 {
1357 int i;
1358
1359 for (i = 0; i < MACSEC_NUM_AN; i++) {
1360 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1361
1362 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1363 if (sa)
1364 clear_rx_sa(sa);
1365 }
1366
1367 macsec_rxsc_put(rx_sc);
1368 }
1369
del_rx_sc(struct macsec_secy * secy,sci_t sci)1370 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1371 {
1372 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1373
1374 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1375 rx_sc;
1376 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1377 if (rx_sc->sci == sci) {
1378 if (rx_sc->active)
1379 secy->n_rx_sc--;
1380 rcu_assign_pointer(*rx_scp, rx_sc->next);
1381 return rx_sc;
1382 }
1383 }
1384
1385 return NULL;
1386 }
1387
create_rx_sc(struct net_device * dev,sci_t sci,bool active)1388 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci,
1389 bool active)
1390 {
1391 struct macsec_rx_sc *rx_sc;
1392 struct macsec_dev *macsec;
1393 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1394 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1395 struct macsec_secy *secy;
1396
1397 list_for_each_entry(macsec, &rxd->secys, secys) {
1398 if (find_rx_sc_rtnl(&macsec->secy, sci))
1399 return ERR_PTR(-EEXIST);
1400 }
1401
1402 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1403 if (!rx_sc)
1404 return ERR_PTR(-ENOMEM);
1405
1406 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1407 if (!rx_sc->stats) {
1408 kfree(rx_sc);
1409 return ERR_PTR(-ENOMEM);
1410 }
1411
1412 rx_sc->sci = sci;
1413 rx_sc->active = active;
1414 refcount_set(&rx_sc->refcnt, 1);
1415
1416 secy = &macsec_priv(dev)->secy;
1417 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1418 rcu_assign_pointer(secy->rx_sc, rx_sc);
1419
1420 if (rx_sc->active)
1421 secy->n_rx_sc++;
1422
1423 return rx_sc;
1424 }
1425
init_tx_sa(struct macsec_tx_sa * tx_sa,char * sak,int key_len,int icv_len)1426 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1427 int icv_len)
1428 {
1429 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1430 if (!tx_sa->stats)
1431 return -ENOMEM;
1432
1433 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1434 if (IS_ERR(tx_sa->key.tfm)) {
1435 free_percpu(tx_sa->stats);
1436 return PTR_ERR(tx_sa->key.tfm);
1437 }
1438
1439 tx_sa->ssci = MACSEC_UNDEF_SSCI;
1440 tx_sa->active = false;
1441 refcount_set(&tx_sa->refcnt, 1);
1442 spin_lock_init(&tx_sa->lock);
1443
1444 return 0;
1445 }
1446
clear_tx_sa(struct macsec_tx_sa * tx_sa)1447 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1448 {
1449 tx_sa->active = false;
1450
1451 macsec_txsa_put(tx_sa);
1452 }
1453
1454 static struct genl_family macsec_fam;
1455
get_dev_from_nl(struct net * net,struct nlattr ** attrs)1456 static struct net_device *get_dev_from_nl(struct net *net,
1457 struct nlattr **attrs)
1458 {
1459 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1460 struct net_device *dev;
1461
1462 dev = __dev_get_by_index(net, ifindex);
1463 if (!dev)
1464 return ERR_PTR(-ENODEV);
1465
1466 if (!netif_is_macsec(dev))
1467 return ERR_PTR(-ENODEV);
1468
1469 return dev;
1470 }
1471
nla_get_offload(const struct nlattr * nla)1472 static enum macsec_offload nla_get_offload(const struct nlattr *nla)
1473 {
1474 return (__force enum macsec_offload)nla_get_u8(nla);
1475 }
1476
nla_get_sci(const struct nlattr * nla)1477 static sci_t nla_get_sci(const struct nlattr *nla)
1478 {
1479 return (__force sci_t)nla_get_u64(nla);
1480 }
1481
nla_put_sci(struct sk_buff * skb,int attrtype,sci_t value,int padattr)1482 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1483 int padattr)
1484 {
1485 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1486 }
1487
nla_get_ssci(const struct nlattr * nla)1488 static ssci_t nla_get_ssci(const struct nlattr *nla)
1489 {
1490 return (__force ssci_t)nla_get_u32(nla);
1491 }
1492
nla_put_ssci(struct sk_buff * skb,int attrtype,ssci_t value)1493 static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
1494 {
1495 return nla_put_u32(skb, attrtype, (__force u64)value);
1496 }
1497
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)1498 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1499 struct nlattr **attrs,
1500 struct nlattr **tb_sa,
1501 struct net_device **devp,
1502 struct macsec_secy **secyp,
1503 struct macsec_tx_sc **scp,
1504 u8 *assoc_num)
1505 {
1506 struct net_device *dev;
1507 struct macsec_secy *secy;
1508 struct macsec_tx_sc *tx_sc;
1509 struct macsec_tx_sa *tx_sa;
1510
1511 if (!tb_sa[MACSEC_SA_ATTR_AN])
1512 return ERR_PTR(-EINVAL);
1513
1514 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1515
1516 dev = get_dev_from_nl(net, attrs);
1517 if (IS_ERR(dev))
1518 return ERR_CAST(dev);
1519
1520 if (*assoc_num >= MACSEC_NUM_AN)
1521 return ERR_PTR(-EINVAL);
1522
1523 secy = &macsec_priv(dev)->secy;
1524 tx_sc = &secy->tx_sc;
1525
1526 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1527 if (!tx_sa)
1528 return ERR_PTR(-ENODEV);
1529
1530 *devp = dev;
1531 *scp = tx_sc;
1532 *secyp = secy;
1533 return tx_sa;
1534 }
1535
get_rxsc_from_nl(struct net * net,struct nlattr ** attrs,struct nlattr ** tb_rxsc,struct net_device ** devp,struct macsec_secy ** secyp)1536 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1537 struct nlattr **attrs,
1538 struct nlattr **tb_rxsc,
1539 struct net_device **devp,
1540 struct macsec_secy **secyp)
1541 {
1542 struct net_device *dev;
1543 struct macsec_secy *secy;
1544 struct macsec_rx_sc *rx_sc;
1545 sci_t sci;
1546
1547 dev = get_dev_from_nl(net, attrs);
1548 if (IS_ERR(dev))
1549 return ERR_CAST(dev);
1550
1551 secy = &macsec_priv(dev)->secy;
1552
1553 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1554 return ERR_PTR(-EINVAL);
1555
1556 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1557 rx_sc = find_rx_sc_rtnl(secy, sci);
1558 if (!rx_sc)
1559 return ERR_PTR(-ENODEV);
1560
1561 *secyp = secy;
1562 *devp = dev;
1563
1564 return rx_sc;
1565 }
1566
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)1567 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1568 struct nlattr **attrs,
1569 struct nlattr **tb_rxsc,
1570 struct nlattr **tb_sa,
1571 struct net_device **devp,
1572 struct macsec_secy **secyp,
1573 struct macsec_rx_sc **scp,
1574 u8 *assoc_num)
1575 {
1576 struct macsec_rx_sc *rx_sc;
1577 struct macsec_rx_sa *rx_sa;
1578
1579 if (!tb_sa[MACSEC_SA_ATTR_AN])
1580 return ERR_PTR(-EINVAL);
1581
1582 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1583 if (*assoc_num >= MACSEC_NUM_AN)
1584 return ERR_PTR(-EINVAL);
1585
1586 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1587 if (IS_ERR(rx_sc))
1588 return ERR_CAST(rx_sc);
1589
1590 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1591 if (!rx_sa)
1592 return ERR_PTR(-ENODEV);
1593
1594 *scp = rx_sc;
1595 return rx_sa;
1596 }
1597
1598 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1599 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1600 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1601 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1602 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1603 };
1604
1605 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1606 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1607 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1608 };
1609
1610 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1611 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1612 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1613 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4),
1614 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1615 .len = MACSEC_KEYID_LEN, },
1616 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1617 .len = MACSEC_MAX_KEY_LEN, },
1618 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
1619 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
1620 .len = MACSEC_SALT_LEN, },
1621 };
1622
1623 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
1624 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
1625 };
1626
1627 /* Offloads an operation to a device driver */
macsec_offload(int (* const func)(struct macsec_context *),struct macsec_context * ctx)1628 static int macsec_offload(int (* const func)(struct macsec_context *),
1629 struct macsec_context *ctx)
1630 {
1631 int ret;
1632
1633 if (unlikely(!func))
1634 return 0;
1635
1636 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1637 mutex_lock(&ctx->phydev->lock);
1638
1639 /* Phase I: prepare. The drive should fail here if there are going to be
1640 * issues in the commit phase.
1641 */
1642 ctx->prepare = true;
1643 ret = (*func)(ctx);
1644 if (ret)
1645 goto phy_unlock;
1646
1647 /* Phase II: commit. This step cannot fail. */
1648 ctx->prepare = false;
1649 ret = (*func)(ctx);
1650 /* This should never happen: commit is not allowed to fail */
1651 if (unlikely(ret))
1652 WARN(1, "MACsec offloading commit failed (%d)\n", ret);
1653
1654 phy_unlock:
1655 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1656 mutex_unlock(&ctx->phydev->lock);
1657
1658 return ret;
1659 }
1660
parse_sa_config(struct nlattr ** attrs,struct nlattr ** tb_sa)1661 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1662 {
1663 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1664 return -EINVAL;
1665
1666 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1667 return -EINVAL;
1668
1669 return 0;
1670 }
1671
parse_rxsc_config(struct nlattr ** attrs,struct nlattr ** tb_rxsc)1672 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1673 {
1674 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1675 return -EINVAL;
1676
1677 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1678 return -EINVAL;
1679
1680 return 0;
1681 }
1682
validate_add_rxsa(struct nlattr ** attrs)1683 static bool validate_add_rxsa(struct nlattr **attrs)
1684 {
1685 if (!attrs[MACSEC_SA_ATTR_AN] ||
1686 !attrs[MACSEC_SA_ATTR_KEY] ||
1687 !attrs[MACSEC_SA_ATTR_KEYID])
1688 return false;
1689
1690 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1691 return false;
1692
1693 if (attrs[MACSEC_SA_ATTR_PN] &&
1694 nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1695 return false;
1696
1697 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1698 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1699 return false;
1700 }
1701
1702 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1703 return false;
1704
1705 return true;
1706 }
1707
macsec_add_rxsa(struct sk_buff * skb,struct genl_info * info)1708 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1709 {
1710 struct net_device *dev;
1711 struct nlattr **attrs = info->attrs;
1712 struct macsec_secy *secy;
1713 struct macsec_rx_sc *rx_sc;
1714 struct macsec_rx_sa *rx_sa;
1715 unsigned char assoc_num;
1716 int pn_len;
1717 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1718 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1719 int err;
1720
1721 if (!attrs[MACSEC_ATTR_IFINDEX])
1722 return -EINVAL;
1723
1724 if (parse_sa_config(attrs, tb_sa))
1725 return -EINVAL;
1726
1727 if (parse_rxsc_config(attrs, tb_rxsc))
1728 return -EINVAL;
1729
1730 if (!validate_add_rxsa(tb_sa))
1731 return -EINVAL;
1732
1733 rtnl_lock();
1734 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1735 if (IS_ERR(rx_sc)) {
1736 rtnl_unlock();
1737 return PTR_ERR(rx_sc);
1738 }
1739
1740 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1741
1742 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1743 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1744 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1745 rtnl_unlock();
1746 return -EINVAL;
1747 }
1748
1749 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1750 if (tb_sa[MACSEC_SA_ATTR_PN] &&
1751 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1752 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
1753 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1754 rtnl_unlock();
1755 return -EINVAL;
1756 }
1757
1758 if (secy->xpn) {
1759 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
1760 rtnl_unlock();
1761 return -EINVAL;
1762 }
1763
1764 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
1765 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
1766 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
1767 MACSEC_SALT_LEN);
1768 rtnl_unlock();
1769 return -EINVAL;
1770 }
1771 }
1772
1773 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1774 if (rx_sa) {
1775 rtnl_unlock();
1776 return -EBUSY;
1777 }
1778
1779 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1780 if (!rx_sa) {
1781 rtnl_unlock();
1782 return -ENOMEM;
1783 }
1784
1785 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1786 secy->key_len, secy->icv_len);
1787 if (err < 0) {
1788 kfree(rx_sa);
1789 rtnl_unlock();
1790 return err;
1791 }
1792
1793 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1794 spin_lock_bh(&rx_sa->lock);
1795 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
1796 spin_unlock_bh(&rx_sa->lock);
1797 }
1798
1799 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1800 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1801
1802 rx_sa->sc = rx_sc;
1803
1804 /* If h/w offloading is available, propagate to the device */
1805 if (macsec_is_offloaded(netdev_priv(dev))) {
1806 const struct macsec_ops *ops;
1807 struct macsec_context ctx;
1808
1809 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1810 if (!ops) {
1811 err = -EOPNOTSUPP;
1812 goto cleanup;
1813 }
1814
1815 ctx.sa.assoc_num = assoc_num;
1816 ctx.sa.rx_sa = rx_sa;
1817 ctx.secy = secy;
1818 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1819 secy->key_len);
1820
1821 err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1822 memzero_explicit(ctx.sa.key, secy->key_len);
1823 if (err)
1824 goto cleanup;
1825 }
1826
1827 if (secy->xpn) {
1828 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
1829 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
1830 MACSEC_SALT_LEN);
1831 }
1832
1833 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1834 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1835
1836 rtnl_unlock();
1837
1838 return 0;
1839
1840 cleanup:
1841 macsec_rxsa_put(rx_sa);
1842 rtnl_unlock();
1843 return err;
1844 }
1845
validate_add_rxsc(struct nlattr ** attrs)1846 static bool validate_add_rxsc(struct nlattr **attrs)
1847 {
1848 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1849 return false;
1850
1851 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1852 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1853 return false;
1854 }
1855
1856 return true;
1857 }
1858
macsec_add_rxsc(struct sk_buff * skb,struct genl_info * info)1859 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1860 {
1861 struct net_device *dev;
1862 sci_t sci = MACSEC_UNDEF_SCI;
1863 struct nlattr **attrs = info->attrs;
1864 struct macsec_rx_sc *rx_sc;
1865 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1866 struct macsec_secy *secy;
1867 bool active = true;
1868 int ret;
1869
1870 if (!attrs[MACSEC_ATTR_IFINDEX])
1871 return -EINVAL;
1872
1873 if (parse_rxsc_config(attrs, tb_rxsc))
1874 return -EINVAL;
1875
1876 if (!validate_add_rxsc(tb_rxsc))
1877 return -EINVAL;
1878
1879 rtnl_lock();
1880 dev = get_dev_from_nl(genl_info_net(info), attrs);
1881 if (IS_ERR(dev)) {
1882 rtnl_unlock();
1883 return PTR_ERR(dev);
1884 }
1885
1886 secy = &macsec_priv(dev)->secy;
1887 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1888
1889 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1890 active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1891
1892 rx_sc = create_rx_sc(dev, sci, active);
1893 if (IS_ERR(rx_sc)) {
1894 rtnl_unlock();
1895 return PTR_ERR(rx_sc);
1896 }
1897
1898 if (macsec_is_offloaded(netdev_priv(dev))) {
1899 const struct macsec_ops *ops;
1900 struct macsec_context ctx;
1901
1902 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1903 if (!ops) {
1904 ret = -EOPNOTSUPP;
1905 goto cleanup;
1906 }
1907
1908 ctx.rx_sc = rx_sc;
1909 ctx.secy = secy;
1910
1911 ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1912 if (ret)
1913 goto cleanup;
1914 }
1915
1916 rtnl_unlock();
1917
1918 return 0;
1919
1920 cleanup:
1921 del_rx_sc(secy, sci);
1922 free_rx_sc(rx_sc);
1923 rtnl_unlock();
1924 return ret;
1925 }
1926
validate_add_txsa(struct nlattr ** attrs)1927 static bool validate_add_txsa(struct nlattr **attrs)
1928 {
1929 if (!attrs[MACSEC_SA_ATTR_AN] ||
1930 !attrs[MACSEC_SA_ATTR_PN] ||
1931 !attrs[MACSEC_SA_ATTR_KEY] ||
1932 !attrs[MACSEC_SA_ATTR_KEYID])
1933 return false;
1934
1935 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1936 return false;
1937
1938 if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1939 return false;
1940
1941 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1942 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1943 return false;
1944 }
1945
1946 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1947 return false;
1948
1949 return true;
1950 }
1951
macsec_add_txsa(struct sk_buff * skb,struct genl_info * info)1952 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1953 {
1954 struct net_device *dev;
1955 struct nlattr **attrs = info->attrs;
1956 struct macsec_secy *secy;
1957 struct macsec_tx_sc *tx_sc;
1958 struct macsec_tx_sa *tx_sa;
1959 unsigned char assoc_num;
1960 int pn_len;
1961 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1962 bool was_operational;
1963 int err;
1964
1965 if (!attrs[MACSEC_ATTR_IFINDEX])
1966 return -EINVAL;
1967
1968 if (parse_sa_config(attrs, tb_sa))
1969 return -EINVAL;
1970
1971 if (!validate_add_txsa(tb_sa))
1972 return -EINVAL;
1973
1974 rtnl_lock();
1975 dev = get_dev_from_nl(genl_info_net(info), attrs);
1976 if (IS_ERR(dev)) {
1977 rtnl_unlock();
1978 return PTR_ERR(dev);
1979 }
1980
1981 secy = &macsec_priv(dev)->secy;
1982 tx_sc = &secy->tx_sc;
1983
1984 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1985
1986 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1987 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1988 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1989 rtnl_unlock();
1990 return -EINVAL;
1991 }
1992
1993 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1994 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1995 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
1996 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1997 rtnl_unlock();
1998 return -EINVAL;
1999 }
2000
2001 if (secy->xpn) {
2002 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
2003 rtnl_unlock();
2004 return -EINVAL;
2005 }
2006
2007 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
2008 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
2009 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
2010 MACSEC_SALT_LEN);
2011 rtnl_unlock();
2012 return -EINVAL;
2013 }
2014 }
2015
2016 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
2017 if (tx_sa) {
2018 rtnl_unlock();
2019 return -EBUSY;
2020 }
2021
2022 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
2023 if (!tx_sa) {
2024 rtnl_unlock();
2025 return -ENOMEM;
2026 }
2027
2028 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2029 secy->key_len, secy->icv_len);
2030 if (err < 0) {
2031 kfree(tx_sa);
2032 rtnl_unlock();
2033 return err;
2034 }
2035
2036 spin_lock_bh(&tx_sa->lock);
2037 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2038 spin_unlock_bh(&tx_sa->lock);
2039
2040 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2041 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2042
2043 was_operational = secy->operational;
2044 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
2045 secy->operational = true;
2046
2047 /* If h/w offloading is available, propagate to the device */
2048 if (macsec_is_offloaded(netdev_priv(dev))) {
2049 const struct macsec_ops *ops;
2050 struct macsec_context ctx;
2051
2052 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2053 if (!ops) {
2054 err = -EOPNOTSUPP;
2055 goto cleanup;
2056 }
2057
2058 ctx.sa.assoc_num = assoc_num;
2059 ctx.sa.tx_sa = tx_sa;
2060 ctx.secy = secy;
2061 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2062 secy->key_len);
2063
2064 err = macsec_offload(ops->mdo_add_txsa, &ctx);
2065 memzero_explicit(ctx.sa.key, secy->key_len);
2066 if (err)
2067 goto cleanup;
2068 }
2069
2070 if (secy->xpn) {
2071 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
2072 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
2073 MACSEC_SALT_LEN);
2074 }
2075
2076 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
2077 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
2078
2079 rtnl_unlock();
2080
2081 return 0;
2082
2083 cleanup:
2084 secy->operational = was_operational;
2085 macsec_txsa_put(tx_sa);
2086 rtnl_unlock();
2087 return err;
2088 }
2089
macsec_del_rxsa(struct sk_buff * skb,struct genl_info * info)2090 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
2091 {
2092 struct nlattr **attrs = info->attrs;
2093 struct net_device *dev;
2094 struct macsec_secy *secy;
2095 struct macsec_rx_sc *rx_sc;
2096 struct macsec_rx_sa *rx_sa;
2097 u8 assoc_num;
2098 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2099 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2100 int ret;
2101
2102 if (!attrs[MACSEC_ATTR_IFINDEX])
2103 return -EINVAL;
2104
2105 if (parse_sa_config(attrs, tb_sa))
2106 return -EINVAL;
2107
2108 if (parse_rxsc_config(attrs, tb_rxsc))
2109 return -EINVAL;
2110
2111 rtnl_lock();
2112 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2113 &dev, &secy, &rx_sc, &assoc_num);
2114 if (IS_ERR(rx_sa)) {
2115 rtnl_unlock();
2116 return PTR_ERR(rx_sa);
2117 }
2118
2119 if (rx_sa->active) {
2120 rtnl_unlock();
2121 return -EBUSY;
2122 }
2123
2124 /* If h/w offloading is available, propagate to the device */
2125 if (macsec_is_offloaded(netdev_priv(dev))) {
2126 const struct macsec_ops *ops;
2127 struct macsec_context ctx;
2128
2129 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2130 if (!ops) {
2131 ret = -EOPNOTSUPP;
2132 goto cleanup;
2133 }
2134
2135 ctx.sa.assoc_num = assoc_num;
2136 ctx.sa.rx_sa = rx_sa;
2137 ctx.secy = secy;
2138
2139 ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
2140 if (ret)
2141 goto cleanup;
2142 }
2143
2144 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
2145 clear_rx_sa(rx_sa);
2146
2147 rtnl_unlock();
2148
2149 return 0;
2150
2151 cleanup:
2152 rtnl_unlock();
2153 return ret;
2154 }
2155
macsec_del_rxsc(struct sk_buff * skb,struct genl_info * info)2156 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
2157 {
2158 struct nlattr **attrs = info->attrs;
2159 struct net_device *dev;
2160 struct macsec_secy *secy;
2161 struct macsec_rx_sc *rx_sc;
2162 sci_t sci;
2163 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2164 int ret;
2165
2166 if (!attrs[MACSEC_ATTR_IFINDEX])
2167 return -EINVAL;
2168
2169 if (parse_rxsc_config(attrs, tb_rxsc))
2170 return -EINVAL;
2171
2172 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
2173 return -EINVAL;
2174
2175 rtnl_lock();
2176 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2177 if (IS_ERR(dev)) {
2178 rtnl_unlock();
2179 return PTR_ERR(dev);
2180 }
2181
2182 secy = &macsec_priv(dev)->secy;
2183 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2184
2185 rx_sc = del_rx_sc(secy, sci);
2186 if (!rx_sc) {
2187 rtnl_unlock();
2188 return -ENODEV;
2189 }
2190
2191 /* If h/w offloading is available, propagate to the device */
2192 if (macsec_is_offloaded(netdev_priv(dev))) {
2193 const struct macsec_ops *ops;
2194 struct macsec_context ctx;
2195
2196 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2197 if (!ops) {
2198 ret = -EOPNOTSUPP;
2199 goto cleanup;
2200 }
2201
2202 ctx.rx_sc = rx_sc;
2203 ctx.secy = secy;
2204 ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2205 if (ret)
2206 goto cleanup;
2207 }
2208
2209 free_rx_sc(rx_sc);
2210 rtnl_unlock();
2211
2212 return 0;
2213
2214 cleanup:
2215 rtnl_unlock();
2216 return ret;
2217 }
2218
macsec_del_txsa(struct sk_buff * skb,struct genl_info * info)2219 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2220 {
2221 struct nlattr **attrs = info->attrs;
2222 struct net_device *dev;
2223 struct macsec_secy *secy;
2224 struct macsec_tx_sc *tx_sc;
2225 struct macsec_tx_sa *tx_sa;
2226 u8 assoc_num;
2227 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2228 int ret;
2229
2230 if (!attrs[MACSEC_ATTR_IFINDEX])
2231 return -EINVAL;
2232
2233 if (parse_sa_config(attrs, tb_sa))
2234 return -EINVAL;
2235
2236 rtnl_lock();
2237 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2238 &dev, &secy, &tx_sc, &assoc_num);
2239 if (IS_ERR(tx_sa)) {
2240 rtnl_unlock();
2241 return PTR_ERR(tx_sa);
2242 }
2243
2244 if (tx_sa->active) {
2245 rtnl_unlock();
2246 return -EBUSY;
2247 }
2248
2249 /* If h/w offloading is available, propagate to the device */
2250 if (macsec_is_offloaded(netdev_priv(dev))) {
2251 const struct macsec_ops *ops;
2252 struct macsec_context ctx;
2253
2254 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2255 if (!ops) {
2256 ret = -EOPNOTSUPP;
2257 goto cleanup;
2258 }
2259
2260 ctx.sa.assoc_num = assoc_num;
2261 ctx.sa.tx_sa = tx_sa;
2262 ctx.secy = secy;
2263
2264 ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2265 if (ret)
2266 goto cleanup;
2267 }
2268
2269 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2270 clear_tx_sa(tx_sa);
2271
2272 rtnl_unlock();
2273
2274 return 0;
2275
2276 cleanup:
2277 rtnl_unlock();
2278 return ret;
2279 }
2280
validate_upd_sa(struct nlattr ** attrs)2281 static bool validate_upd_sa(struct nlattr **attrs)
2282 {
2283 if (!attrs[MACSEC_SA_ATTR_AN] ||
2284 attrs[MACSEC_SA_ATTR_KEY] ||
2285 attrs[MACSEC_SA_ATTR_KEYID] ||
2286 attrs[MACSEC_SA_ATTR_SSCI] ||
2287 attrs[MACSEC_SA_ATTR_SALT])
2288 return false;
2289
2290 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2291 return false;
2292
2293 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
2294 return false;
2295
2296 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2297 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2298 return false;
2299 }
2300
2301 return true;
2302 }
2303
macsec_upd_txsa(struct sk_buff * skb,struct genl_info * info)2304 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2305 {
2306 struct nlattr **attrs = info->attrs;
2307 struct net_device *dev;
2308 struct macsec_secy *secy;
2309 struct macsec_tx_sc *tx_sc;
2310 struct macsec_tx_sa *tx_sa;
2311 u8 assoc_num;
2312 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2313 bool was_operational, was_active;
2314 pn_t prev_pn;
2315 int ret = 0;
2316
2317 prev_pn.full64 = 0;
2318
2319 if (!attrs[MACSEC_ATTR_IFINDEX])
2320 return -EINVAL;
2321
2322 if (parse_sa_config(attrs, tb_sa))
2323 return -EINVAL;
2324
2325 if (!validate_upd_sa(tb_sa))
2326 return -EINVAL;
2327
2328 rtnl_lock();
2329 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2330 &dev, &secy, &tx_sc, &assoc_num);
2331 if (IS_ERR(tx_sa)) {
2332 rtnl_unlock();
2333 return PTR_ERR(tx_sa);
2334 }
2335
2336 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2337 int pn_len;
2338
2339 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2340 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2341 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
2342 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2343 rtnl_unlock();
2344 return -EINVAL;
2345 }
2346
2347 spin_lock_bh(&tx_sa->lock);
2348 prev_pn = tx_sa->next_pn_halves;
2349 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2350 spin_unlock_bh(&tx_sa->lock);
2351 }
2352
2353 was_active = tx_sa->active;
2354 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2355 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2356
2357 was_operational = secy->operational;
2358 if (assoc_num == tx_sc->encoding_sa)
2359 secy->operational = tx_sa->active;
2360
2361 /* If h/w offloading is available, propagate to the device */
2362 if (macsec_is_offloaded(netdev_priv(dev))) {
2363 const struct macsec_ops *ops;
2364 struct macsec_context ctx;
2365
2366 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2367 if (!ops) {
2368 ret = -EOPNOTSUPP;
2369 goto cleanup;
2370 }
2371
2372 ctx.sa.assoc_num = assoc_num;
2373 ctx.sa.tx_sa = tx_sa;
2374 ctx.secy = secy;
2375
2376 ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
2377 if (ret)
2378 goto cleanup;
2379 }
2380
2381 rtnl_unlock();
2382
2383 return 0;
2384
2385 cleanup:
2386 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2387 spin_lock_bh(&tx_sa->lock);
2388 tx_sa->next_pn_halves = prev_pn;
2389 spin_unlock_bh(&tx_sa->lock);
2390 }
2391 tx_sa->active = was_active;
2392 secy->operational = was_operational;
2393 rtnl_unlock();
2394 return ret;
2395 }
2396
macsec_upd_rxsa(struct sk_buff * skb,struct genl_info * info)2397 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2398 {
2399 struct nlattr **attrs = info->attrs;
2400 struct net_device *dev;
2401 struct macsec_secy *secy;
2402 struct macsec_rx_sc *rx_sc;
2403 struct macsec_rx_sa *rx_sa;
2404 u8 assoc_num;
2405 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2406 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2407 bool was_active;
2408 pn_t prev_pn;
2409 int ret = 0;
2410
2411 prev_pn.full64 = 0;
2412
2413 if (!attrs[MACSEC_ATTR_IFINDEX])
2414 return -EINVAL;
2415
2416 if (parse_rxsc_config(attrs, tb_rxsc))
2417 return -EINVAL;
2418
2419 if (parse_sa_config(attrs, tb_sa))
2420 return -EINVAL;
2421
2422 if (!validate_upd_sa(tb_sa))
2423 return -EINVAL;
2424
2425 rtnl_lock();
2426 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2427 &dev, &secy, &rx_sc, &assoc_num);
2428 if (IS_ERR(rx_sa)) {
2429 rtnl_unlock();
2430 return PTR_ERR(rx_sa);
2431 }
2432
2433 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2434 int pn_len;
2435
2436 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2437 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2438 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
2439 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2440 rtnl_unlock();
2441 return -EINVAL;
2442 }
2443
2444 spin_lock_bh(&rx_sa->lock);
2445 prev_pn = rx_sa->next_pn_halves;
2446 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2447 spin_unlock_bh(&rx_sa->lock);
2448 }
2449
2450 was_active = rx_sa->active;
2451 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2452 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2453
2454 /* If h/w offloading is available, propagate to the device */
2455 if (macsec_is_offloaded(netdev_priv(dev))) {
2456 const struct macsec_ops *ops;
2457 struct macsec_context ctx;
2458
2459 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2460 if (!ops) {
2461 ret = -EOPNOTSUPP;
2462 goto cleanup;
2463 }
2464
2465 ctx.sa.assoc_num = assoc_num;
2466 ctx.sa.rx_sa = rx_sa;
2467 ctx.secy = secy;
2468
2469 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2470 if (ret)
2471 goto cleanup;
2472 }
2473
2474 rtnl_unlock();
2475 return 0;
2476
2477 cleanup:
2478 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2479 spin_lock_bh(&rx_sa->lock);
2480 rx_sa->next_pn_halves = prev_pn;
2481 spin_unlock_bh(&rx_sa->lock);
2482 }
2483 rx_sa->active = was_active;
2484 rtnl_unlock();
2485 return ret;
2486 }
2487
macsec_upd_rxsc(struct sk_buff * skb,struct genl_info * info)2488 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2489 {
2490 struct nlattr **attrs = info->attrs;
2491 struct net_device *dev;
2492 struct macsec_secy *secy;
2493 struct macsec_rx_sc *rx_sc;
2494 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2495 unsigned int prev_n_rx_sc;
2496 bool was_active;
2497 int ret;
2498
2499 if (!attrs[MACSEC_ATTR_IFINDEX])
2500 return -EINVAL;
2501
2502 if (parse_rxsc_config(attrs, tb_rxsc))
2503 return -EINVAL;
2504
2505 if (!validate_add_rxsc(tb_rxsc))
2506 return -EINVAL;
2507
2508 rtnl_lock();
2509 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2510 if (IS_ERR(rx_sc)) {
2511 rtnl_unlock();
2512 return PTR_ERR(rx_sc);
2513 }
2514
2515 was_active = rx_sc->active;
2516 prev_n_rx_sc = secy->n_rx_sc;
2517 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2518 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2519
2520 if (rx_sc->active != new)
2521 secy->n_rx_sc += new ? 1 : -1;
2522
2523 rx_sc->active = new;
2524 }
2525
2526 /* If h/w offloading is available, propagate to the device */
2527 if (macsec_is_offloaded(netdev_priv(dev))) {
2528 const struct macsec_ops *ops;
2529 struct macsec_context ctx;
2530
2531 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2532 if (!ops) {
2533 ret = -EOPNOTSUPP;
2534 goto cleanup;
2535 }
2536
2537 ctx.rx_sc = rx_sc;
2538 ctx.secy = secy;
2539
2540 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2541 if (ret)
2542 goto cleanup;
2543 }
2544
2545 rtnl_unlock();
2546
2547 return 0;
2548
2549 cleanup:
2550 secy->n_rx_sc = prev_n_rx_sc;
2551 rx_sc->active = was_active;
2552 rtnl_unlock();
2553 return ret;
2554 }
2555
macsec_is_configured(struct macsec_dev * macsec)2556 static bool macsec_is_configured(struct macsec_dev *macsec)
2557 {
2558 struct macsec_secy *secy = &macsec->secy;
2559 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2560 int i;
2561
2562 if (secy->rx_sc)
2563 return true;
2564
2565 for (i = 0; i < MACSEC_NUM_AN; i++)
2566 if (tx_sc->sa[i])
2567 return true;
2568
2569 return false;
2570 }
2571
macsec_upd_offload(struct sk_buff * skb,struct genl_info * info)2572 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2573 {
2574 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2575 enum macsec_offload offload, prev_offload;
2576 int (*func)(struct macsec_context *ctx);
2577 struct nlattr **attrs = info->attrs;
2578 struct net_device *dev;
2579 const struct macsec_ops *ops;
2580 struct macsec_context ctx;
2581 struct macsec_dev *macsec;
2582 int ret = 0;
2583
2584 if (!attrs[MACSEC_ATTR_IFINDEX])
2585 return -EINVAL;
2586
2587 if (!attrs[MACSEC_ATTR_OFFLOAD])
2588 return -EINVAL;
2589
2590 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2591 attrs[MACSEC_ATTR_OFFLOAD],
2592 macsec_genl_offload_policy, NULL))
2593 return -EINVAL;
2594
2595 rtnl_lock();
2596
2597 dev = get_dev_from_nl(genl_info_net(info), attrs);
2598 if (IS_ERR(dev)) {
2599 ret = PTR_ERR(dev);
2600 goto out;
2601 }
2602 macsec = macsec_priv(dev);
2603
2604 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) {
2605 ret = -EINVAL;
2606 goto out;
2607 }
2608
2609 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2610 if (macsec->offload == offload)
2611 goto out;
2612
2613 /* Check if the offloading mode is supported by the underlying layers */
2614 if (offload != MACSEC_OFFLOAD_OFF &&
2615 !macsec_check_offload(offload, macsec)) {
2616 ret = -EOPNOTSUPP;
2617 goto out;
2618 }
2619
2620 /* Check if the net device is busy. */
2621 if (netif_running(dev)) {
2622 ret = -EBUSY;
2623 goto out;
2624 }
2625
2626 prev_offload = macsec->offload;
2627 macsec->offload = offload;
2628
2629 /* Check if the device already has rules configured: we do not support
2630 * rules migration.
2631 */
2632 if (macsec_is_configured(macsec)) {
2633 ret = -EBUSY;
2634 goto rollback;
2635 }
2636
2637 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2638 macsec, &ctx);
2639 if (!ops) {
2640 ret = -EOPNOTSUPP;
2641 goto rollback;
2642 }
2643
2644 if (prev_offload == MACSEC_OFFLOAD_OFF)
2645 func = ops->mdo_add_secy;
2646 else
2647 func = ops->mdo_del_secy;
2648
2649 ctx.secy = &macsec->secy;
2650 ret = macsec_offload(func, &ctx);
2651 if (ret)
2652 goto rollback;
2653
2654 rtnl_unlock();
2655 return 0;
2656
2657 rollback:
2658 macsec->offload = prev_offload;
2659 out:
2660 rtnl_unlock();
2661 return ret;
2662 }
2663
get_tx_sa_stats(struct net_device * dev,int an,struct macsec_tx_sa * tx_sa,struct macsec_tx_sa_stats * sum)2664 static void get_tx_sa_stats(struct net_device *dev, int an,
2665 struct macsec_tx_sa *tx_sa,
2666 struct macsec_tx_sa_stats *sum)
2667 {
2668 struct macsec_dev *macsec = macsec_priv(dev);
2669 int cpu;
2670
2671 /* If h/w offloading is available, propagate to the device */
2672 if (macsec_is_offloaded(macsec)) {
2673 const struct macsec_ops *ops;
2674 struct macsec_context ctx;
2675
2676 ops = macsec_get_ops(macsec, &ctx);
2677 if (ops) {
2678 ctx.sa.assoc_num = an;
2679 ctx.sa.tx_sa = tx_sa;
2680 ctx.stats.tx_sa_stats = sum;
2681 ctx.secy = &macsec_priv(dev)->secy;
2682 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
2683 }
2684 return;
2685 }
2686
2687 for_each_possible_cpu(cpu) {
2688 const struct macsec_tx_sa_stats *stats =
2689 per_cpu_ptr(tx_sa->stats, cpu);
2690
2691 sum->OutPktsProtected += stats->OutPktsProtected;
2692 sum->OutPktsEncrypted += stats->OutPktsEncrypted;
2693 }
2694 }
2695
copy_tx_sa_stats(struct sk_buff * skb,struct macsec_tx_sa_stats * sum)2696 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
2697 {
2698 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
2699 sum->OutPktsProtected) ||
2700 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2701 sum->OutPktsEncrypted))
2702 return -EMSGSIZE;
2703
2704 return 0;
2705 }
2706
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)2707 static void get_rx_sa_stats(struct net_device *dev,
2708 struct macsec_rx_sc *rx_sc, int an,
2709 struct macsec_rx_sa *rx_sa,
2710 struct macsec_rx_sa_stats *sum)
2711 {
2712 struct macsec_dev *macsec = macsec_priv(dev);
2713 int cpu;
2714
2715 /* If h/w offloading is available, propagate to the device */
2716 if (macsec_is_offloaded(macsec)) {
2717 const struct macsec_ops *ops;
2718 struct macsec_context ctx;
2719
2720 ops = macsec_get_ops(macsec, &ctx);
2721 if (ops) {
2722 ctx.sa.assoc_num = an;
2723 ctx.sa.rx_sa = rx_sa;
2724 ctx.stats.rx_sa_stats = sum;
2725 ctx.secy = &macsec_priv(dev)->secy;
2726 ctx.rx_sc = rx_sc;
2727 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
2728 }
2729 return;
2730 }
2731
2732 for_each_possible_cpu(cpu) {
2733 const struct macsec_rx_sa_stats *stats =
2734 per_cpu_ptr(rx_sa->stats, cpu);
2735
2736 sum->InPktsOK += stats->InPktsOK;
2737 sum->InPktsInvalid += stats->InPktsInvalid;
2738 sum->InPktsNotValid += stats->InPktsNotValid;
2739 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
2740 sum->InPktsUnusedSA += stats->InPktsUnusedSA;
2741 }
2742 }
2743
copy_rx_sa_stats(struct sk_buff * skb,struct macsec_rx_sa_stats * sum)2744 static int copy_rx_sa_stats(struct sk_buff *skb,
2745 struct macsec_rx_sa_stats *sum)
2746 {
2747 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
2748 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
2749 sum->InPktsInvalid) ||
2750 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
2751 sum->InPktsNotValid) ||
2752 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2753 sum->InPktsNotUsingSA) ||
2754 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
2755 sum->InPktsUnusedSA))
2756 return -EMSGSIZE;
2757
2758 return 0;
2759 }
2760
get_rx_sc_stats(struct net_device * dev,struct macsec_rx_sc * rx_sc,struct macsec_rx_sc_stats * sum)2761 static void get_rx_sc_stats(struct net_device *dev,
2762 struct macsec_rx_sc *rx_sc,
2763 struct macsec_rx_sc_stats *sum)
2764 {
2765 struct macsec_dev *macsec = macsec_priv(dev);
2766 int cpu;
2767
2768 /* If h/w offloading is available, propagate to the device */
2769 if (macsec_is_offloaded(macsec)) {
2770 const struct macsec_ops *ops;
2771 struct macsec_context ctx;
2772
2773 ops = macsec_get_ops(macsec, &ctx);
2774 if (ops) {
2775 ctx.stats.rx_sc_stats = sum;
2776 ctx.secy = &macsec_priv(dev)->secy;
2777 ctx.rx_sc = rx_sc;
2778 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
2779 }
2780 return;
2781 }
2782
2783 for_each_possible_cpu(cpu) {
2784 const struct pcpu_rx_sc_stats *stats;
2785 struct macsec_rx_sc_stats tmp;
2786 unsigned int start;
2787
2788 stats = per_cpu_ptr(rx_sc->stats, cpu);
2789 do {
2790 start = u64_stats_fetch_begin_irq(&stats->syncp);
2791 memcpy(&tmp, &stats->stats, sizeof(tmp));
2792 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2793
2794 sum->InOctetsValidated += tmp.InOctetsValidated;
2795 sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
2796 sum->InPktsUnchecked += tmp.InPktsUnchecked;
2797 sum->InPktsDelayed += tmp.InPktsDelayed;
2798 sum->InPktsOK += tmp.InPktsOK;
2799 sum->InPktsInvalid += tmp.InPktsInvalid;
2800 sum->InPktsLate += tmp.InPktsLate;
2801 sum->InPktsNotValid += tmp.InPktsNotValid;
2802 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2803 sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
2804 }
2805 }
2806
copy_rx_sc_stats(struct sk_buff * skb,struct macsec_rx_sc_stats * sum)2807 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
2808 {
2809 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2810 sum->InOctetsValidated,
2811 MACSEC_RXSC_STATS_ATTR_PAD) ||
2812 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2813 sum->InOctetsDecrypted,
2814 MACSEC_RXSC_STATS_ATTR_PAD) ||
2815 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2816 sum->InPktsUnchecked,
2817 MACSEC_RXSC_STATS_ATTR_PAD) ||
2818 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2819 sum->InPktsDelayed,
2820 MACSEC_RXSC_STATS_ATTR_PAD) ||
2821 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2822 sum->InPktsOK,
2823 MACSEC_RXSC_STATS_ATTR_PAD) ||
2824 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2825 sum->InPktsInvalid,
2826 MACSEC_RXSC_STATS_ATTR_PAD) ||
2827 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2828 sum->InPktsLate,
2829 MACSEC_RXSC_STATS_ATTR_PAD) ||
2830 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2831 sum->InPktsNotValid,
2832 MACSEC_RXSC_STATS_ATTR_PAD) ||
2833 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2834 sum->InPktsNotUsingSA,
2835 MACSEC_RXSC_STATS_ATTR_PAD) ||
2836 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2837 sum->InPktsUnusedSA,
2838 MACSEC_RXSC_STATS_ATTR_PAD))
2839 return -EMSGSIZE;
2840
2841 return 0;
2842 }
2843
get_tx_sc_stats(struct net_device * dev,struct macsec_tx_sc_stats * sum)2844 static void get_tx_sc_stats(struct net_device *dev,
2845 struct macsec_tx_sc_stats *sum)
2846 {
2847 struct macsec_dev *macsec = macsec_priv(dev);
2848 int cpu;
2849
2850 /* If h/w offloading is available, propagate to the device */
2851 if (macsec_is_offloaded(macsec)) {
2852 const struct macsec_ops *ops;
2853 struct macsec_context ctx;
2854
2855 ops = macsec_get_ops(macsec, &ctx);
2856 if (ops) {
2857 ctx.stats.tx_sc_stats = sum;
2858 ctx.secy = &macsec_priv(dev)->secy;
2859 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
2860 }
2861 return;
2862 }
2863
2864 for_each_possible_cpu(cpu) {
2865 const struct pcpu_tx_sc_stats *stats;
2866 struct macsec_tx_sc_stats tmp;
2867 unsigned int start;
2868
2869 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
2870 do {
2871 start = u64_stats_fetch_begin_irq(&stats->syncp);
2872 memcpy(&tmp, &stats->stats, sizeof(tmp));
2873 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2874
2875 sum->OutPktsProtected += tmp.OutPktsProtected;
2876 sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
2877 sum->OutOctetsProtected += tmp.OutOctetsProtected;
2878 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2879 }
2880 }
2881
copy_tx_sc_stats(struct sk_buff * skb,struct macsec_tx_sc_stats * sum)2882 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
2883 {
2884 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2885 sum->OutPktsProtected,
2886 MACSEC_TXSC_STATS_ATTR_PAD) ||
2887 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2888 sum->OutPktsEncrypted,
2889 MACSEC_TXSC_STATS_ATTR_PAD) ||
2890 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2891 sum->OutOctetsProtected,
2892 MACSEC_TXSC_STATS_ATTR_PAD) ||
2893 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2894 sum->OutOctetsEncrypted,
2895 MACSEC_TXSC_STATS_ATTR_PAD))
2896 return -EMSGSIZE;
2897
2898 return 0;
2899 }
2900
get_secy_stats(struct net_device * dev,struct macsec_dev_stats * sum)2901 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
2902 {
2903 struct macsec_dev *macsec = macsec_priv(dev);
2904 int cpu;
2905
2906 /* If h/w offloading is available, propagate to the device */
2907 if (macsec_is_offloaded(macsec)) {
2908 const struct macsec_ops *ops;
2909 struct macsec_context ctx;
2910
2911 ops = macsec_get_ops(macsec, &ctx);
2912 if (ops) {
2913 ctx.stats.dev_stats = sum;
2914 ctx.secy = &macsec_priv(dev)->secy;
2915 macsec_offload(ops->mdo_get_dev_stats, &ctx);
2916 }
2917 return;
2918 }
2919
2920 for_each_possible_cpu(cpu) {
2921 const struct pcpu_secy_stats *stats;
2922 struct macsec_dev_stats tmp;
2923 unsigned int start;
2924
2925 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
2926 do {
2927 start = u64_stats_fetch_begin_irq(&stats->syncp);
2928 memcpy(&tmp, &stats->stats, sizeof(tmp));
2929 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2930
2931 sum->OutPktsUntagged += tmp.OutPktsUntagged;
2932 sum->InPktsUntagged += tmp.InPktsUntagged;
2933 sum->OutPktsTooLong += tmp.OutPktsTooLong;
2934 sum->InPktsNoTag += tmp.InPktsNoTag;
2935 sum->InPktsBadTag += tmp.InPktsBadTag;
2936 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2937 sum->InPktsNoSCI += tmp.InPktsNoSCI;
2938 sum->InPktsOverrun += tmp.InPktsOverrun;
2939 }
2940 }
2941
copy_secy_stats(struct sk_buff * skb,struct macsec_dev_stats * sum)2942 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
2943 {
2944 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2945 sum->OutPktsUntagged,
2946 MACSEC_SECY_STATS_ATTR_PAD) ||
2947 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2948 sum->InPktsUntagged,
2949 MACSEC_SECY_STATS_ATTR_PAD) ||
2950 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2951 sum->OutPktsTooLong,
2952 MACSEC_SECY_STATS_ATTR_PAD) ||
2953 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2954 sum->InPktsNoTag,
2955 MACSEC_SECY_STATS_ATTR_PAD) ||
2956 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2957 sum->InPktsBadTag,
2958 MACSEC_SECY_STATS_ATTR_PAD) ||
2959 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2960 sum->InPktsUnknownSCI,
2961 MACSEC_SECY_STATS_ATTR_PAD) ||
2962 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2963 sum->InPktsNoSCI,
2964 MACSEC_SECY_STATS_ATTR_PAD) ||
2965 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2966 sum->InPktsOverrun,
2967 MACSEC_SECY_STATS_ATTR_PAD))
2968 return -EMSGSIZE;
2969
2970 return 0;
2971 }
2972
nla_put_secy(struct macsec_secy * secy,struct sk_buff * skb)2973 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2974 {
2975 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2976 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
2977 MACSEC_ATTR_SECY);
2978 u64 csid;
2979
2980 if (!secy_nest)
2981 return 1;
2982
2983 switch (secy->key_len) {
2984 case MACSEC_GCM_AES_128_SAK_LEN:
2985 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
2986 break;
2987 case MACSEC_GCM_AES_256_SAK_LEN:
2988 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
2989 break;
2990 default:
2991 goto cancel;
2992 }
2993
2994 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2995 MACSEC_SECY_ATTR_PAD) ||
2996 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2997 csid, MACSEC_SECY_ATTR_PAD) ||
2998 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2999 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
3000 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
3001 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
3002 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
3003 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
3004 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
3005 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
3006 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
3007 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
3008 goto cancel;
3009
3010 if (secy->replay_protect) {
3011 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
3012 goto cancel;
3013 }
3014
3015 nla_nest_end(skb, secy_nest);
3016 return 0;
3017
3018 cancel:
3019 nla_nest_cancel(skb, secy_nest);
3020 return 1;
3021 }
3022
3023 static noinline_for_stack int
dump_secy(struct macsec_secy * secy,struct net_device * dev,struct sk_buff * skb,struct netlink_callback * cb)3024 dump_secy(struct macsec_secy *secy, struct net_device *dev,
3025 struct sk_buff *skb, struct netlink_callback *cb)
3026 {
3027 struct macsec_tx_sc_stats tx_sc_stats = {0, };
3028 struct macsec_tx_sa_stats tx_sa_stats = {0, };
3029 struct macsec_rx_sc_stats rx_sc_stats = {0, };
3030 struct macsec_rx_sa_stats rx_sa_stats = {0, };
3031 struct macsec_dev *macsec = netdev_priv(dev);
3032 struct macsec_dev_stats dev_stats = {0, };
3033 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3034 struct nlattr *txsa_list, *rxsc_list;
3035 struct macsec_rx_sc *rx_sc;
3036 struct nlattr *attr;
3037 void *hdr;
3038 int i, j;
3039
3040 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3041 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
3042 if (!hdr)
3043 return -EMSGSIZE;
3044
3045 genl_dump_check_consistent(cb, hdr);
3046
3047 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
3048 goto nla_put_failure;
3049
3050 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
3051 if (!attr)
3052 goto nla_put_failure;
3053 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
3054 goto nla_put_failure;
3055 nla_nest_end(skb, attr);
3056
3057 if (nla_put_secy(secy, skb))
3058 goto nla_put_failure;
3059
3060 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
3061 if (!attr)
3062 goto nla_put_failure;
3063
3064 get_tx_sc_stats(dev, &tx_sc_stats);
3065 if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
3066 nla_nest_cancel(skb, attr);
3067 goto nla_put_failure;
3068 }
3069 nla_nest_end(skb, attr);
3070
3071 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
3072 if (!attr)
3073 goto nla_put_failure;
3074 get_secy_stats(dev, &dev_stats);
3075 if (copy_secy_stats(skb, &dev_stats)) {
3076 nla_nest_cancel(skb, attr);
3077 goto nla_put_failure;
3078 }
3079 nla_nest_end(skb, attr);
3080
3081 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
3082 if (!txsa_list)
3083 goto nla_put_failure;
3084 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
3085 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
3086 struct nlattr *txsa_nest;
3087 u64 pn;
3088 int pn_len;
3089
3090 if (!tx_sa)
3091 continue;
3092
3093 txsa_nest = nla_nest_start_noflag(skb, j++);
3094 if (!txsa_nest) {
3095 nla_nest_cancel(skb, txsa_list);
3096 goto nla_put_failure;
3097 }
3098
3099 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
3100 if (!attr) {
3101 nla_nest_cancel(skb, txsa_nest);
3102 nla_nest_cancel(skb, txsa_list);
3103 goto nla_put_failure;
3104 }
3105 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
3106 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
3107 if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
3108 nla_nest_cancel(skb, attr);
3109 nla_nest_cancel(skb, txsa_nest);
3110 nla_nest_cancel(skb, txsa_list);
3111 goto nla_put_failure;
3112 }
3113 nla_nest_end(skb, attr);
3114
3115 if (secy->xpn) {
3116 pn = tx_sa->next_pn;
3117 pn_len = MACSEC_XPN_PN_LEN;
3118 } else {
3119 pn = tx_sa->next_pn_halves.lower;
3120 pn_len = MACSEC_DEFAULT_PN_LEN;
3121 }
3122
3123 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3124 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3125 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
3126 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
3127 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
3128 nla_nest_cancel(skb, txsa_nest);
3129 nla_nest_cancel(skb, txsa_list);
3130 goto nla_put_failure;
3131 }
3132
3133 nla_nest_end(skb, txsa_nest);
3134 }
3135 nla_nest_end(skb, txsa_list);
3136
3137 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
3138 if (!rxsc_list)
3139 goto nla_put_failure;
3140
3141 j = 1;
3142 for_each_rxsc_rtnl(secy, rx_sc) {
3143 int k;
3144 struct nlattr *rxsa_list;
3145 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
3146
3147 if (!rxsc_nest) {
3148 nla_nest_cancel(skb, rxsc_list);
3149 goto nla_put_failure;
3150 }
3151
3152 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
3153 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
3154 MACSEC_RXSC_ATTR_PAD)) {
3155 nla_nest_cancel(skb, rxsc_nest);
3156 nla_nest_cancel(skb, rxsc_list);
3157 goto nla_put_failure;
3158 }
3159
3160 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
3161 if (!attr) {
3162 nla_nest_cancel(skb, rxsc_nest);
3163 nla_nest_cancel(skb, rxsc_list);
3164 goto nla_put_failure;
3165 }
3166 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
3167 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
3168 if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
3169 nla_nest_cancel(skb, attr);
3170 nla_nest_cancel(skb, rxsc_nest);
3171 nla_nest_cancel(skb, rxsc_list);
3172 goto nla_put_failure;
3173 }
3174 nla_nest_end(skb, attr);
3175
3176 rxsa_list = nla_nest_start_noflag(skb,
3177 MACSEC_RXSC_ATTR_SA_LIST);
3178 if (!rxsa_list) {
3179 nla_nest_cancel(skb, rxsc_nest);
3180 nla_nest_cancel(skb, rxsc_list);
3181 goto nla_put_failure;
3182 }
3183
3184 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
3185 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
3186 struct nlattr *rxsa_nest;
3187 u64 pn;
3188 int pn_len;
3189
3190 if (!rx_sa)
3191 continue;
3192
3193 rxsa_nest = nla_nest_start_noflag(skb, k++);
3194 if (!rxsa_nest) {
3195 nla_nest_cancel(skb, rxsa_list);
3196 nla_nest_cancel(skb, rxsc_nest);
3197 nla_nest_cancel(skb, rxsc_list);
3198 goto nla_put_failure;
3199 }
3200
3201 attr = nla_nest_start_noflag(skb,
3202 MACSEC_SA_ATTR_STATS);
3203 if (!attr) {
3204 nla_nest_cancel(skb, rxsa_list);
3205 nla_nest_cancel(skb, rxsc_nest);
3206 nla_nest_cancel(skb, rxsc_list);
3207 goto nla_put_failure;
3208 }
3209 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
3210 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
3211 if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
3212 nla_nest_cancel(skb, attr);
3213 nla_nest_cancel(skb, rxsa_list);
3214 nla_nest_cancel(skb, rxsc_nest);
3215 nla_nest_cancel(skb, rxsc_list);
3216 goto nla_put_failure;
3217 }
3218 nla_nest_end(skb, attr);
3219
3220 if (secy->xpn) {
3221 pn = rx_sa->next_pn;
3222 pn_len = MACSEC_XPN_PN_LEN;
3223 } else {
3224 pn = rx_sa->next_pn_halves.lower;
3225 pn_len = MACSEC_DEFAULT_PN_LEN;
3226 }
3227
3228 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3229 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3230 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
3231 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
3232 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
3233 nla_nest_cancel(skb, rxsa_nest);
3234 nla_nest_cancel(skb, rxsc_nest);
3235 nla_nest_cancel(skb, rxsc_list);
3236 goto nla_put_failure;
3237 }
3238 nla_nest_end(skb, rxsa_nest);
3239 }
3240
3241 nla_nest_end(skb, rxsa_list);
3242 nla_nest_end(skb, rxsc_nest);
3243 }
3244
3245 nla_nest_end(skb, rxsc_list);
3246
3247 genlmsg_end(skb, hdr);
3248
3249 return 0;
3250
3251 nla_put_failure:
3252 genlmsg_cancel(skb, hdr);
3253 return -EMSGSIZE;
3254 }
3255
3256 static int macsec_generation = 1; /* protected by RTNL */
3257
macsec_dump_txsc(struct sk_buff * skb,struct netlink_callback * cb)3258 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
3259 {
3260 struct net *net = sock_net(skb->sk);
3261 struct net_device *dev;
3262 int dev_idx, d;
3263
3264 dev_idx = cb->args[0];
3265
3266 d = 0;
3267 rtnl_lock();
3268
3269 cb->seq = macsec_generation;
3270
3271 for_each_netdev(net, dev) {
3272 struct macsec_secy *secy;
3273
3274 if (d < dev_idx)
3275 goto next;
3276
3277 if (!netif_is_macsec(dev))
3278 goto next;
3279
3280 secy = &macsec_priv(dev)->secy;
3281 if (dump_secy(secy, dev, skb, cb) < 0)
3282 goto done;
3283 next:
3284 d++;
3285 }
3286
3287 done:
3288 rtnl_unlock();
3289 cb->args[0] = d;
3290 return skb->len;
3291 }
3292
3293 static const struct genl_small_ops macsec_genl_ops[] = {
3294 {
3295 .cmd = MACSEC_CMD_GET_TXSC,
3296 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3297 .dumpit = macsec_dump_txsc,
3298 },
3299 {
3300 .cmd = MACSEC_CMD_ADD_RXSC,
3301 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3302 .doit = macsec_add_rxsc,
3303 .flags = GENL_ADMIN_PERM,
3304 },
3305 {
3306 .cmd = MACSEC_CMD_DEL_RXSC,
3307 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3308 .doit = macsec_del_rxsc,
3309 .flags = GENL_ADMIN_PERM,
3310 },
3311 {
3312 .cmd = MACSEC_CMD_UPD_RXSC,
3313 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3314 .doit = macsec_upd_rxsc,
3315 .flags = GENL_ADMIN_PERM,
3316 },
3317 {
3318 .cmd = MACSEC_CMD_ADD_TXSA,
3319 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3320 .doit = macsec_add_txsa,
3321 .flags = GENL_ADMIN_PERM,
3322 },
3323 {
3324 .cmd = MACSEC_CMD_DEL_TXSA,
3325 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3326 .doit = macsec_del_txsa,
3327 .flags = GENL_ADMIN_PERM,
3328 },
3329 {
3330 .cmd = MACSEC_CMD_UPD_TXSA,
3331 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3332 .doit = macsec_upd_txsa,
3333 .flags = GENL_ADMIN_PERM,
3334 },
3335 {
3336 .cmd = MACSEC_CMD_ADD_RXSA,
3337 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3338 .doit = macsec_add_rxsa,
3339 .flags = GENL_ADMIN_PERM,
3340 },
3341 {
3342 .cmd = MACSEC_CMD_DEL_RXSA,
3343 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3344 .doit = macsec_del_rxsa,
3345 .flags = GENL_ADMIN_PERM,
3346 },
3347 {
3348 .cmd = MACSEC_CMD_UPD_RXSA,
3349 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3350 .doit = macsec_upd_rxsa,
3351 .flags = GENL_ADMIN_PERM,
3352 },
3353 {
3354 .cmd = MACSEC_CMD_UPD_OFFLOAD,
3355 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3356 .doit = macsec_upd_offload,
3357 .flags = GENL_ADMIN_PERM,
3358 },
3359 };
3360
3361 static struct genl_family macsec_fam __ro_after_init = {
3362 .name = MACSEC_GENL_NAME,
3363 .hdrsize = 0,
3364 .version = MACSEC_GENL_VERSION,
3365 .maxattr = MACSEC_ATTR_MAX,
3366 .policy = macsec_genl_policy,
3367 .netnsok = true,
3368 .module = THIS_MODULE,
3369 .small_ops = macsec_genl_ops,
3370 .n_small_ops = ARRAY_SIZE(macsec_genl_ops),
3371 };
3372
macsec_start_xmit(struct sk_buff * skb,struct net_device * dev)3373 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3374 struct net_device *dev)
3375 {
3376 struct macsec_dev *macsec = netdev_priv(dev);
3377 struct macsec_secy *secy = &macsec->secy;
3378 struct pcpu_secy_stats *secy_stats;
3379 int ret, len;
3380
3381 if (macsec_is_offloaded(netdev_priv(dev))) {
3382 skb->dev = macsec->real_dev;
3383 return dev_queue_xmit(skb);
3384 }
3385
3386 /* 10.5 */
3387 if (!secy->protect_frames) {
3388 secy_stats = this_cpu_ptr(macsec->stats);
3389 u64_stats_update_begin(&secy_stats->syncp);
3390 secy_stats->stats.OutPktsUntagged++;
3391 u64_stats_update_end(&secy_stats->syncp);
3392 skb->dev = macsec->real_dev;
3393 len = skb->len;
3394 ret = dev_queue_xmit(skb);
3395 count_tx(dev, ret, len);
3396 return ret;
3397 }
3398
3399 if (!secy->operational) {
3400 kfree_skb(skb);
3401 dev->stats.tx_dropped++;
3402 return NETDEV_TX_OK;
3403 }
3404
3405 skb = macsec_encrypt(skb, dev);
3406 if (IS_ERR(skb)) {
3407 if (PTR_ERR(skb) != -EINPROGRESS)
3408 dev->stats.tx_dropped++;
3409 return NETDEV_TX_OK;
3410 }
3411
3412 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3413
3414 macsec_encrypt_finish(skb, dev);
3415 len = skb->len;
3416 ret = dev_queue_xmit(skb);
3417 count_tx(dev, ret, len);
3418 return ret;
3419 }
3420
3421 #define MACSEC_FEATURES \
3422 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3423
macsec_dev_init(struct net_device * dev)3424 static int macsec_dev_init(struct net_device *dev)
3425 {
3426 struct macsec_dev *macsec = macsec_priv(dev);
3427 struct net_device *real_dev = macsec->real_dev;
3428 int err;
3429
3430 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3431 if (!dev->tstats)
3432 return -ENOMEM;
3433
3434 err = gro_cells_init(&macsec->gro_cells, dev);
3435 if (err) {
3436 free_percpu(dev->tstats);
3437 return err;
3438 }
3439
3440 dev->features = real_dev->features & MACSEC_FEATURES;
3441 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
3442
3443 dev->needed_headroom = real_dev->needed_headroom +
3444 MACSEC_NEEDED_HEADROOM;
3445 dev->needed_tailroom = real_dev->needed_tailroom +
3446 MACSEC_NEEDED_TAILROOM;
3447
3448 if (is_zero_ether_addr(dev->dev_addr))
3449 eth_hw_addr_inherit(dev, real_dev);
3450 if (is_zero_ether_addr(dev->broadcast))
3451 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3452
3453 return 0;
3454 }
3455
macsec_dev_uninit(struct net_device * dev)3456 static void macsec_dev_uninit(struct net_device *dev)
3457 {
3458 struct macsec_dev *macsec = macsec_priv(dev);
3459
3460 gro_cells_destroy(&macsec->gro_cells);
3461 free_percpu(dev->tstats);
3462 }
3463
macsec_fix_features(struct net_device * dev,netdev_features_t features)3464 static netdev_features_t macsec_fix_features(struct net_device *dev,
3465 netdev_features_t features)
3466 {
3467 struct macsec_dev *macsec = macsec_priv(dev);
3468 struct net_device *real_dev = macsec->real_dev;
3469
3470 features &= (real_dev->features & MACSEC_FEATURES) |
3471 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3472 features |= NETIF_F_LLTX;
3473
3474 return features;
3475 }
3476
macsec_dev_open(struct net_device * dev)3477 static int macsec_dev_open(struct net_device *dev)
3478 {
3479 struct macsec_dev *macsec = macsec_priv(dev);
3480 struct net_device *real_dev = macsec->real_dev;
3481 int err;
3482
3483 err = dev_uc_add(real_dev, dev->dev_addr);
3484 if (err < 0)
3485 return err;
3486
3487 if (dev->flags & IFF_ALLMULTI) {
3488 err = dev_set_allmulti(real_dev, 1);
3489 if (err < 0)
3490 goto del_unicast;
3491 }
3492
3493 if (dev->flags & IFF_PROMISC) {
3494 err = dev_set_promiscuity(real_dev, 1);
3495 if (err < 0)
3496 goto clear_allmulti;
3497 }
3498
3499 /* If h/w offloading is available, propagate to the device */
3500 if (macsec_is_offloaded(macsec)) {
3501 const struct macsec_ops *ops;
3502 struct macsec_context ctx;
3503
3504 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3505 if (!ops) {
3506 err = -EOPNOTSUPP;
3507 goto clear_allmulti;
3508 }
3509
3510 ctx.secy = &macsec->secy;
3511 err = macsec_offload(ops->mdo_dev_open, &ctx);
3512 if (err)
3513 goto clear_allmulti;
3514 }
3515
3516 if (netif_carrier_ok(real_dev))
3517 netif_carrier_on(dev);
3518
3519 return 0;
3520 clear_allmulti:
3521 if (dev->flags & IFF_ALLMULTI)
3522 dev_set_allmulti(real_dev, -1);
3523 del_unicast:
3524 dev_uc_del(real_dev, dev->dev_addr);
3525 netif_carrier_off(dev);
3526 return err;
3527 }
3528
macsec_dev_stop(struct net_device * dev)3529 static int macsec_dev_stop(struct net_device *dev)
3530 {
3531 struct macsec_dev *macsec = macsec_priv(dev);
3532 struct net_device *real_dev = macsec->real_dev;
3533
3534 netif_carrier_off(dev);
3535
3536 /* If h/w offloading is available, propagate to the device */
3537 if (macsec_is_offloaded(macsec)) {
3538 const struct macsec_ops *ops;
3539 struct macsec_context ctx;
3540
3541 ops = macsec_get_ops(macsec, &ctx);
3542 if (ops) {
3543 ctx.secy = &macsec->secy;
3544 macsec_offload(ops->mdo_dev_stop, &ctx);
3545 }
3546 }
3547
3548 dev_mc_unsync(real_dev, dev);
3549 dev_uc_unsync(real_dev, dev);
3550
3551 if (dev->flags & IFF_ALLMULTI)
3552 dev_set_allmulti(real_dev, -1);
3553
3554 if (dev->flags & IFF_PROMISC)
3555 dev_set_promiscuity(real_dev, -1);
3556
3557 dev_uc_del(real_dev, dev->dev_addr);
3558
3559 return 0;
3560 }
3561
macsec_dev_change_rx_flags(struct net_device * dev,int change)3562 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3563 {
3564 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3565
3566 if (!(dev->flags & IFF_UP))
3567 return;
3568
3569 if (change & IFF_ALLMULTI)
3570 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3571
3572 if (change & IFF_PROMISC)
3573 dev_set_promiscuity(real_dev,
3574 dev->flags & IFF_PROMISC ? 1 : -1);
3575 }
3576
macsec_dev_set_rx_mode(struct net_device * dev)3577 static void macsec_dev_set_rx_mode(struct net_device *dev)
3578 {
3579 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3580
3581 dev_mc_sync(real_dev, dev);
3582 dev_uc_sync(real_dev, dev);
3583 }
3584
macsec_set_mac_address(struct net_device * dev,void * p)3585 static int macsec_set_mac_address(struct net_device *dev, void *p)
3586 {
3587 struct macsec_dev *macsec = macsec_priv(dev);
3588 struct net_device *real_dev = macsec->real_dev;
3589 struct sockaddr *addr = p;
3590 int err;
3591
3592 if (!is_valid_ether_addr(addr->sa_data))
3593 return -EADDRNOTAVAIL;
3594
3595 if (!(dev->flags & IFF_UP))
3596 goto out;
3597
3598 err = dev_uc_add(real_dev, addr->sa_data);
3599 if (err < 0)
3600 return err;
3601
3602 dev_uc_del(real_dev, dev->dev_addr);
3603
3604 out:
3605 eth_hw_addr_set(dev, addr->sa_data);
3606
3607 /* If h/w offloading is available, propagate to the device */
3608 if (macsec_is_offloaded(macsec)) {
3609 const struct macsec_ops *ops;
3610 struct macsec_context ctx;
3611
3612 ops = macsec_get_ops(macsec, &ctx);
3613 if (ops) {
3614 ctx.secy = &macsec->secy;
3615 macsec_offload(ops->mdo_upd_secy, &ctx);
3616 }
3617 }
3618
3619 return 0;
3620 }
3621
macsec_change_mtu(struct net_device * dev,int new_mtu)3622 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3623 {
3624 struct macsec_dev *macsec = macsec_priv(dev);
3625 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3626
3627 if (macsec->real_dev->mtu - extra < new_mtu)
3628 return -ERANGE;
3629
3630 dev->mtu = new_mtu;
3631
3632 return 0;
3633 }
3634
macsec_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * s)3635 static void macsec_get_stats64(struct net_device *dev,
3636 struct rtnl_link_stats64 *s)
3637 {
3638 if (!dev->tstats)
3639 return;
3640
3641 dev_fetch_sw_netstats(s, dev->tstats);
3642
3643 s->rx_dropped = dev->stats.rx_dropped;
3644 s->tx_dropped = dev->stats.tx_dropped;
3645 }
3646
macsec_get_iflink(const struct net_device * dev)3647 static int macsec_get_iflink(const struct net_device *dev)
3648 {
3649 return macsec_priv(dev)->real_dev->ifindex;
3650 }
3651
3652 static const struct net_device_ops macsec_netdev_ops = {
3653 .ndo_init = macsec_dev_init,
3654 .ndo_uninit = macsec_dev_uninit,
3655 .ndo_open = macsec_dev_open,
3656 .ndo_stop = macsec_dev_stop,
3657 .ndo_fix_features = macsec_fix_features,
3658 .ndo_change_mtu = macsec_change_mtu,
3659 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
3660 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
3661 .ndo_set_mac_address = macsec_set_mac_address,
3662 .ndo_start_xmit = macsec_start_xmit,
3663 .ndo_get_stats64 = macsec_get_stats64,
3664 .ndo_get_iflink = macsec_get_iflink,
3665 };
3666
3667 static const struct device_type macsec_type = {
3668 .name = "macsec",
3669 };
3670
3671 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3672 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3673 [IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3674 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3675 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3676 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3677 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3678 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3679 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3680 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3681 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3682 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3683 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3684 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3685 [IFLA_MACSEC_OFFLOAD] = { .type = NLA_U8 },
3686 };
3687
macsec_free_netdev(struct net_device * dev)3688 static void macsec_free_netdev(struct net_device *dev)
3689 {
3690 struct macsec_dev *macsec = macsec_priv(dev);
3691
3692 free_percpu(macsec->stats);
3693 free_percpu(macsec->secy.tx_sc.stats);
3694
3695 }
3696
macsec_setup(struct net_device * dev)3697 static void macsec_setup(struct net_device *dev)
3698 {
3699 ether_setup(dev);
3700 dev->min_mtu = 0;
3701 dev->max_mtu = ETH_MAX_MTU;
3702 dev->priv_flags |= IFF_NO_QUEUE;
3703 dev->netdev_ops = &macsec_netdev_ops;
3704 dev->needs_free_netdev = true;
3705 dev->priv_destructor = macsec_free_netdev;
3706 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3707
3708 eth_zero_addr(dev->broadcast);
3709 }
3710
macsec_changelink_common(struct net_device * dev,struct nlattr * data[])3711 static int macsec_changelink_common(struct net_device *dev,
3712 struct nlattr *data[])
3713 {
3714 struct macsec_secy *secy;
3715 struct macsec_tx_sc *tx_sc;
3716
3717 secy = &macsec_priv(dev)->secy;
3718 tx_sc = &secy->tx_sc;
3719
3720 if (data[IFLA_MACSEC_ENCODING_SA]) {
3721 struct macsec_tx_sa *tx_sa;
3722
3723 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3724 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3725
3726 secy->operational = tx_sa && tx_sa->active;
3727 }
3728
3729 if (data[IFLA_MACSEC_ENCRYPT])
3730 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3731
3732 if (data[IFLA_MACSEC_PROTECT])
3733 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3734
3735 if (data[IFLA_MACSEC_INC_SCI])
3736 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3737
3738 if (data[IFLA_MACSEC_ES])
3739 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3740
3741 if (data[IFLA_MACSEC_SCB])
3742 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3743
3744 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3745 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3746
3747 if (data[IFLA_MACSEC_VALIDATION])
3748 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3749
3750 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3751 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3752 case MACSEC_CIPHER_ID_GCM_AES_128:
3753 case MACSEC_DEFAULT_CIPHER_ID:
3754 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3755 secy->xpn = false;
3756 break;
3757 case MACSEC_CIPHER_ID_GCM_AES_256:
3758 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3759 secy->xpn = false;
3760 break;
3761 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
3762 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3763 secy->xpn = true;
3764 break;
3765 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
3766 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3767 secy->xpn = true;
3768 break;
3769 default:
3770 return -EINVAL;
3771 }
3772 }
3773
3774 if (data[IFLA_MACSEC_WINDOW]) {
3775 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3776
3777 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window
3778 * for XPN cipher suites */
3779 if (secy->xpn &&
3780 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW)
3781 return -EINVAL;
3782 }
3783
3784 return 0;
3785 }
3786
macsec_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)3787 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3788 struct nlattr *data[],
3789 struct netlink_ext_ack *extack)
3790 {
3791 struct macsec_dev *macsec = macsec_priv(dev);
3792 struct macsec_tx_sc tx_sc;
3793 struct macsec_secy secy;
3794 int ret;
3795
3796 if (!data)
3797 return 0;
3798
3799 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3800 data[IFLA_MACSEC_ICV_LEN] ||
3801 data[IFLA_MACSEC_SCI] ||
3802 data[IFLA_MACSEC_PORT])
3803 return -EINVAL;
3804
3805 /* Keep a copy of unmodified secy and tx_sc, in case the offload
3806 * propagation fails, to revert macsec_changelink_common.
3807 */
3808 memcpy(&secy, &macsec->secy, sizeof(secy));
3809 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3810
3811 ret = macsec_changelink_common(dev, data);
3812 if (ret)
3813 goto cleanup;
3814
3815 /* If h/w offloading is available, propagate to the device */
3816 if (macsec_is_offloaded(macsec)) {
3817 const struct macsec_ops *ops;
3818 struct macsec_context ctx;
3819
3820 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3821 if (!ops) {
3822 ret = -EOPNOTSUPP;
3823 goto cleanup;
3824 }
3825
3826 ctx.secy = &macsec->secy;
3827 ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3828 if (ret)
3829 goto cleanup;
3830 }
3831
3832 return 0;
3833
3834 cleanup:
3835 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3836 memcpy(&macsec->secy, &secy, sizeof(secy));
3837
3838 return ret;
3839 }
3840
macsec_del_dev(struct macsec_dev * macsec)3841 static void macsec_del_dev(struct macsec_dev *macsec)
3842 {
3843 int i;
3844
3845 while (macsec->secy.rx_sc) {
3846 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3847
3848 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3849 free_rx_sc(rx_sc);
3850 }
3851
3852 for (i = 0; i < MACSEC_NUM_AN; i++) {
3853 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3854
3855 if (sa) {
3856 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3857 clear_tx_sa(sa);
3858 }
3859 }
3860 }
3861
macsec_common_dellink(struct net_device * dev,struct list_head * head)3862 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3863 {
3864 struct macsec_dev *macsec = macsec_priv(dev);
3865 struct net_device *real_dev = macsec->real_dev;
3866
3867 /* If h/w offloading is available, propagate to the device */
3868 if (macsec_is_offloaded(macsec)) {
3869 const struct macsec_ops *ops;
3870 struct macsec_context ctx;
3871
3872 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3873 if (ops) {
3874 ctx.secy = &macsec->secy;
3875 macsec_offload(ops->mdo_del_secy, &ctx);
3876 }
3877 }
3878
3879 unregister_netdevice_queue(dev, head);
3880 list_del_rcu(&macsec->secys);
3881 macsec_del_dev(macsec);
3882 netdev_upper_dev_unlink(real_dev, dev);
3883
3884 macsec_generation++;
3885 }
3886
macsec_dellink(struct net_device * dev,struct list_head * head)3887 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3888 {
3889 struct macsec_dev *macsec = macsec_priv(dev);
3890 struct net_device *real_dev = macsec->real_dev;
3891 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3892
3893 macsec_common_dellink(dev, head);
3894
3895 if (list_empty(&rxd->secys)) {
3896 netdev_rx_handler_unregister(real_dev);
3897 kfree(rxd);
3898 }
3899 }
3900
register_macsec_dev(struct net_device * real_dev,struct net_device * dev)3901 static int register_macsec_dev(struct net_device *real_dev,
3902 struct net_device *dev)
3903 {
3904 struct macsec_dev *macsec = macsec_priv(dev);
3905 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3906
3907 if (!rxd) {
3908 int err;
3909
3910 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3911 if (!rxd)
3912 return -ENOMEM;
3913
3914 INIT_LIST_HEAD(&rxd->secys);
3915
3916 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3917 rxd);
3918 if (err < 0) {
3919 kfree(rxd);
3920 return err;
3921 }
3922 }
3923
3924 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3925 return 0;
3926 }
3927
sci_exists(struct net_device * dev,sci_t sci)3928 static bool sci_exists(struct net_device *dev, sci_t sci)
3929 {
3930 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3931 struct macsec_dev *macsec;
3932
3933 list_for_each_entry(macsec, &rxd->secys, secys) {
3934 if (macsec->secy.sci == sci)
3935 return true;
3936 }
3937
3938 return false;
3939 }
3940
dev_to_sci(struct net_device * dev,__be16 port)3941 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3942 {
3943 return make_sci(dev->dev_addr, port);
3944 }
3945
macsec_add_dev(struct net_device * dev,sci_t sci,u8 icv_len)3946 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3947 {
3948 struct macsec_dev *macsec = macsec_priv(dev);
3949 struct macsec_secy *secy = &macsec->secy;
3950
3951 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3952 if (!macsec->stats)
3953 return -ENOMEM;
3954
3955 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3956 if (!secy->tx_sc.stats) {
3957 free_percpu(macsec->stats);
3958 return -ENOMEM;
3959 }
3960
3961 if (sci == MACSEC_UNDEF_SCI)
3962 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3963
3964 secy->netdev = dev;
3965 secy->operational = true;
3966 secy->key_len = DEFAULT_SAK_LEN;
3967 secy->icv_len = icv_len;
3968 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3969 secy->protect_frames = true;
3970 secy->replay_protect = false;
3971 secy->xpn = DEFAULT_XPN;
3972
3973 secy->sci = sci;
3974 secy->tx_sc.active = true;
3975 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3976 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3977 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3978 secy->tx_sc.end_station = false;
3979 secy->tx_sc.scb = false;
3980
3981 return 0;
3982 }
3983
3984 static struct lock_class_key macsec_netdev_addr_lock_key;
3985
macsec_newlink(struct net * net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)3986 static int macsec_newlink(struct net *net, struct net_device *dev,
3987 struct nlattr *tb[], struct nlattr *data[],
3988 struct netlink_ext_ack *extack)
3989 {
3990 struct macsec_dev *macsec = macsec_priv(dev);
3991 rx_handler_func_t *rx_handler;
3992 u8 icv_len = DEFAULT_ICV_LEN;
3993 struct net_device *real_dev;
3994 int err, mtu;
3995 sci_t sci;
3996
3997 if (!tb[IFLA_LINK])
3998 return -EINVAL;
3999 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
4000 if (!real_dev)
4001 return -ENODEV;
4002 if (real_dev->type != ARPHRD_ETHER)
4003 return -EINVAL;
4004
4005 dev->priv_flags |= IFF_MACSEC;
4006
4007 macsec->real_dev = real_dev;
4008
4009 if (data && data[IFLA_MACSEC_OFFLOAD])
4010 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
4011 else
4012 /* MACsec offloading is off by default */
4013 macsec->offload = MACSEC_OFFLOAD_OFF;
4014
4015 /* Check if the offloading mode is supported by the underlying layers */
4016 if (macsec->offload != MACSEC_OFFLOAD_OFF &&
4017 !macsec_check_offload(macsec->offload, macsec))
4018 return -EOPNOTSUPP;
4019
4020 /* send_sci must be set to true when transmit sci explicitly is set */
4021 if ((data && data[IFLA_MACSEC_SCI]) &&
4022 (data && data[IFLA_MACSEC_INC_SCI])) {
4023 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
4024
4025 if (!send_sci)
4026 return -EINVAL;
4027 }
4028
4029 if (data && data[IFLA_MACSEC_ICV_LEN])
4030 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4031 mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
4032 if (mtu < 0)
4033 dev->mtu = 0;
4034 else
4035 dev->mtu = mtu;
4036
4037 rx_handler = rtnl_dereference(real_dev->rx_handler);
4038 if (rx_handler && rx_handler != macsec_handle_frame)
4039 return -EBUSY;
4040
4041 err = register_netdevice(dev);
4042 if (err < 0)
4043 return err;
4044
4045 netdev_lockdep_set_classes(dev);
4046 lockdep_set_class(&dev->addr_list_lock,
4047 &macsec_netdev_addr_lock_key);
4048
4049 err = netdev_upper_dev_link(real_dev, dev, extack);
4050 if (err < 0)
4051 goto unregister;
4052
4053 /* need to be already registered so that ->init has run and
4054 * the MAC addr is set
4055 */
4056 if (data && data[IFLA_MACSEC_SCI])
4057 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
4058 else if (data && data[IFLA_MACSEC_PORT])
4059 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
4060 else
4061 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4062
4063 if (rx_handler && sci_exists(real_dev, sci)) {
4064 err = -EBUSY;
4065 goto unlink;
4066 }
4067
4068 err = macsec_add_dev(dev, sci, icv_len);
4069 if (err)
4070 goto unlink;
4071
4072 if (data) {
4073 err = macsec_changelink_common(dev, data);
4074 if (err)
4075 goto del_dev;
4076 }
4077
4078 /* If h/w offloading is available, propagate to the device */
4079 if (macsec_is_offloaded(macsec)) {
4080 const struct macsec_ops *ops;
4081 struct macsec_context ctx;
4082
4083 ops = macsec_get_ops(macsec, &ctx);
4084 if (ops) {
4085 ctx.secy = &macsec->secy;
4086 err = macsec_offload(ops->mdo_add_secy, &ctx);
4087 if (err)
4088 goto del_dev;
4089 }
4090 }
4091
4092 err = register_macsec_dev(real_dev, dev);
4093 if (err < 0)
4094 goto del_dev;
4095
4096 netif_stacked_transfer_operstate(real_dev, dev);
4097 linkwatch_fire_event(dev);
4098
4099 macsec_generation++;
4100
4101 return 0;
4102
4103 del_dev:
4104 macsec_del_dev(macsec);
4105 unlink:
4106 netdev_upper_dev_unlink(real_dev, dev);
4107 unregister:
4108 unregister_netdevice(dev);
4109 return err;
4110 }
4111
macsec_validate_attr(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)4112 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
4113 struct netlink_ext_ack *extack)
4114 {
4115 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
4116 u8 icv_len = DEFAULT_ICV_LEN;
4117 int flag;
4118 bool es, scb, sci;
4119
4120 if (!data)
4121 return 0;
4122
4123 if (data[IFLA_MACSEC_CIPHER_SUITE])
4124 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
4125
4126 if (data[IFLA_MACSEC_ICV_LEN]) {
4127 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4128 if (icv_len != DEFAULT_ICV_LEN) {
4129 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
4130 struct crypto_aead *dummy_tfm;
4131
4132 dummy_tfm = macsec_alloc_tfm(dummy_key,
4133 DEFAULT_SAK_LEN,
4134 icv_len);
4135 if (IS_ERR(dummy_tfm))
4136 return PTR_ERR(dummy_tfm);
4137 crypto_free_aead(dummy_tfm);
4138 }
4139 }
4140
4141 switch (csid) {
4142 case MACSEC_CIPHER_ID_GCM_AES_128:
4143 case MACSEC_CIPHER_ID_GCM_AES_256:
4144 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
4145 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
4146 case MACSEC_DEFAULT_CIPHER_ID:
4147 if (icv_len < MACSEC_MIN_ICV_LEN ||
4148 icv_len > MACSEC_STD_ICV_LEN)
4149 return -EINVAL;
4150 break;
4151 default:
4152 return -EINVAL;
4153 }
4154
4155 if (data[IFLA_MACSEC_ENCODING_SA]) {
4156 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
4157 return -EINVAL;
4158 }
4159
4160 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
4161 flag < IFLA_MACSEC_VALIDATION;
4162 flag++) {
4163 if (data[flag]) {
4164 if (nla_get_u8(data[flag]) > 1)
4165 return -EINVAL;
4166 }
4167 }
4168
4169 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
4170 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
4171 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
4172
4173 if ((sci && (scb || es)) || (scb && es))
4174 return -EINVAL;
4175
4176 if (data[IFLA_MACSEC_VALIDATION] &&
4177 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
4178 return -EINVAL;
4179
4180 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
4181 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
4182 !data[IFLA_MACSEC_WINDOW])
4183 return -EINVAL;
4184
4185 return 0;
4186 }
4187
macsec_get_link_net(const struct net_device * dev)4188 static struct net *macsec_get_link_net(const struct net_device *dev)
4189 {
4190 return dev_net(macsec_priv(dev)->real_dev);
4191 }
4192
macsec_get_size(const struct net_device * dev)4193 static size_t macsec_get_size(const struct net_device *dev)
4194 {
4195 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
4196 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
4197 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
4198 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
4199 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
4200 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
4201 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
4202 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
4203 nla_total_size(1) + /* IFLA_MACSEC_ES */
4204 nla_total_size(1) + /* IFLA_MACSEC_SCB */
4205 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
4206 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
4207 0;
4208 }
4209
macsec_fill_info(struct sk_buff * skb,const struct net_device * dev)4210 static int macsec_fill_info(struct sk_buff *skb,
4211 const struct net_device *dev)
4212 {
4213 struct macsec_secy *secy = &macsec_priv(dev)->secy;
4214 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
4215 u64 csid;
4216
4217 switch (secy->key_len) {
4218 case MACSEC_GCM_AES_128_SAK_LEN:
4219 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
4220 break;
4221 case MACSEC_GCM_AES_256_SAK_LEN:
4222 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
4223 break;
4224 default:
4225 goto nla_put_failure;
4226 }
4227
4228 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
4229 IFLA_MACSEC_PAD) ||
4230 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
4231 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
4232 csid, IFLA_MACSEC_PAD) ||
4233 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
4234 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
4235 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
4236 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
4237 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
4238 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
4239 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
4240 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
4241 0)
4242 goto nla_put_failure;
4243
4244 if (secy->replay_protect) {
4245 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
4246 goto nla_put_failure;
4247 }
4248
4249 return 0;
4250
4251 nla_put_failure:
4252 return -EMSGSIZE;
4253 }
4254
4255 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
4256 .kind = "macsec",
4257 .priv_size = sizeof(struct macsec_dev),
4258 .maxtype = IFLA_MACSEC_MAX,
4259 .policy = macsec_rtnl_policy,
4260 .setup = macsec_setup,
4261 .validate = macsec_validate_attr,
4262 .newlink = macsec_newlink,
4263 .changelink = macsec_changelink,
4264 .dellink = macsec_dellink,
4265 .get_size = macsec_get_size,
4266 .fill_info = macsec_fill_info,
4267 .get_link_net = macsec_get_link_net,
4268 };
4269
is_macsec_master(struct net_device * dev)4270 static bool is_macsec_master(struct net_device *dev)
4271 {
4272 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
4273 }
4274
macsec_notify(struct notifier_block * this,unsigned long event,void * ptr)4275 static int macsec_notify(struct notifier_block *this, unsigned long event,
4276 void *ptr)
4277 {
4278 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
4279 LIST_HEAD(head);
4280
4281 if (!is_macsec_master(real_dev))
4282 return NOTIFY_DONE;
4283
4284 switch (event) {
4285 case NETDEV_DOWN:
4286 case NETDEV_UP:
4287 case NETDEV_CHANGE: {
4288 struct macsec_dev *m, *n;
4289 struct macsec_rxh_data *rxd;
4290
4291 rxd = macsec_data_rtnl(real_dev);
4292 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4293 struct net_device *dev = m->secy.netdev;
4294
4295 netif_stacked_transfer_operstate(real_dev, dev);
4296 }
4297 break;
4298 }
4299 case NETDEV_UNREGISTER: {
4300 struct macsec_dev *m, *n;
4301 struct macsec_rxh_data *rxd;
4302
4303 rxd = macsec_data_rtnl(real_dev);
4304 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4305 macsec_common_dellink(m->secy.netdev, &head);
4306 }
4307
4308 netdev_rx_handler_unregister(real_dev);
4309 kfree(rxd);
4310
4311 unregister_netdevice_many(&head);
4312 break;
4313 }
4314 case NETDEV_CHANGEMTU: {
4315 struct macsec_dev *m;
4316 struct macsec_rxh_data *rxd;
4317
4318 rxd = macsec_data_rtnl(real_dev);
4319 list_for_each_entry(m, &rxd->secys, secys) {
4320 struct net_device *dev = m->secy.netdev;
4321 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
4322 macsec_extra_len(true));
4323
4324 if (dev->mtu > mtu)
4325 dev_set_mtu(dev, mtu);
4326 }
4327 }
4328 }
4329
4330 return NOTIFY_OK;
4331 }
4332
4333 static struct notifier_block macsec_notifier = {
4334 .notifier_call = macsec_notify,
4335 };
4336
macsec_init(void)4337 static int __init macsec_init(void)
4338 {
4339 int err;
4340
4341 pr_info("MACsec IEEE 802.1AE\n");
4342 err = register_netdevice_notifier(&macsec_notifier);
4343 if (err)
4344 return err;
4345
4346 err = rtnl_link_register(&macsec_link_ops);
4347 if (err)
4348 goto notifier;
4349
4350 err = genl_register_family(&macsec_fam);
4351 if (err)
4352 goto rtnl;
4353
4354 return 0;
4355
4356 rtnl:
4357 rtnl_link_unregister(&macsec_link_ops);
4358 notifier:
4359 unregister_netdevice_notifier(&macsec_notifier);
4360 return err;
4361 }
4362
macsec_exit(void)4363 static void __exit macsec_exit(void)
4364 {
4365 genl_unregister_family(&macsec_fam);
4366 rtnl_link_unregister(&macsec_link_ops);
4367 unregister_netdevice_notifier(&macsec_notifier);
4368 rcu_barrier();
4369 }
4370
4371 module_init(macsec_init);
4372 module_exit(macsec_exit);
4373
4374 MODULE_ALIAS_RTNL_LINK("macsec");
4375 MODULE_ALIAS_GENL_FAMILY("macsec");
4376
4377 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
4378 MODULE_LICENSE("GPL v2");
4379