1 /* 2 * drivers/net/macsec.c - MACsec device 3 * 4 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 */ 11 12 #include <linux/types.h> 13 #include <linux/skbuff.h> 14 #include <linux/socket.h> 15 #include <linux/module.h> 16 #include <crypto/aead.h> 17 #include <linux/etherdevice.h> 18 #include <linux/rtnetlink.h> 19 #include <net/genetlink.h> 20 #include <net/sock.h> 21 22 #include <uapi/linux/if_macsec.h> 23 24 typedef u64 __bitwise sci_t; 25 26 #define MACSEC_SCI_LEN 8 27 28 /* SecTAG length = macsec_eth_header without the optional SCI */ 29 #define MACSEC_TAG_LEN 6 30 31 struct macsec_eth_header { 32 struct ethhdr eth; 33 /* SecTAG */ 34 u8 tci_an; 35 #if defined(__LITTLE_ENDIAN_BITFIELD) 36 u8 short_length:6, 37 unused:2; 38 #elif defined(__BIG_ENDIAN_BITFIELD) 39 u8 unused:2, 40 short_length:6; 41 #else 42 #error "Please fix <asm/byteorder.h>" 43 #endif 44 __be32 packet_number; 45 u8 secure_channel_id[8]; /* optional */ 46 } __packed; 47 48 #define MACSEC_TCI_VERSION 0x80 49 #define MACSEC_TCI_ES 0x40 /* end station */ 50 #define MACSEC_TCI_SC 0x20 /* SCI present */ 51 #define MACSEC_TCI_SCB 0x10 /* epon */ 52 #define MACSEC_TCI_E 0x08 /* encryption */ 53 #define MACSEC_TCI_C 0x04 /* changed text */ 54 #define MACSEC_AN_MASK 0x03 /* association number */ 55 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C) 56 57 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */ 58 #define MIN_NON_SHORT_LEN 48 59 60 #define GCM_AES_IV_LEN 12 61 #define DEFAULT_ICV_LEN 16 62 63 #define MACSEC_NUM_AN 4 /* 2 bits for the association number */ 64 65 #define for_each_rxsc(secy, sc) \ 66 for (sc = rcu_dereference_bh(secy->rx_sc); \ 67 sc; \ 68 sc = rcu_dereference_bh(sc->next)) 69 #define for_each_rxsc_rtnl(secy, sc) \ 70 for (sc = rtnl_dereference(secy->rx_sc); \ 71 sc; \ 72 sc = rtnl_dereference(sc->next)) 73 74 struct gcm_iv { 75 union { 76 u8 secure_channel_id[8]; 77 sci_t sci; 78 }; 79 __be32 pn; 80 }; 81 82 /** 83 * struct macsec_key - SA key 84 * @id: user-provided key identifier 85 * @tfm: crypto struct, key storage 86 */ 87 struct macsec_key { 88 u64 id; 89 struct crypto_aead *tfm; 90 }; 91 92 struct macsec_rx_sc_stats { 93 __u64 InOctetsValidated; 94 __u64 InOctetsDecrypted; 95 __u64 InPktsUnchecked; 96 __u64 InPktsDelayed; 97 __u64 InPktsOK; 98 __u64 InPktsInvalid; 99 __u64 InPktsLate; 100 __u64 InPktsNotValid; 101 __u64 InPktsNotUsingSA; 102 __u64 InPktsUnusedSA; 103 }; 104 105 struct macsec_rx_sa_stats { 106 __u32 InPktsOK; 107 __u32 InPktsInvalid; 108 __u32 InPktsNotValid; 109 __u32 InPktsNotUsingSA; 110 __u32 InPktsUnusedSA; 111 }; 112 113 struct macsec_tx_sa_stats { 114 __u32 OutPktsProtected; 115 __u32 OutPktsEncrypted; 116 }; 117 118 struct macsec_tx_sc_stats { 119 __u64 OutPktsProtected; 120 __u64 OutPktsEncrypted; 121 __u64 OutOctetsProtected; 122 __u64 OutOctetsEncrypted; 123 }; 124 125 struct macsec_dev_stats { 126 __u64 OutPktsUntagged; 127 __u64 InPktsUntagged; 128 __u64 OutPktsTooLong; 129 __u64 InPktsNoTag; 130 __u64 InPktsBadTag; 131 __u64 InPktsUnknownSCI; 132 __u64 InPktsNoSCI; 133 __u64 InPktsOverrun; 134 }; 135 136 /** 137 * struct macsec_rx_sa - receive secure association 138 * @active: 139 * @next_pn: packet number expected for the next packet 140 * @lock: protects next_pn manipulations 141 * @key: key structure 142 * @stats: per-SA stats 143 */ 144 struct macsec_rx_sa { 145 struct macsec_key key; 146 spinlock_t lock; 147 u32 next_pn; 148 atomic_t refcnt; 149 bool active; 150 struct macsec_rx_sa_stats __percpu *stats; 151 struct macsec_rx_sc *sc; 152 struct rcu_head rcu; 153 }; 154 155 struct pcpu_rx_sc_stats { 156 struct macsec_rx_sc_stats stats; 157 struct u64_stats_sync syncp; 158 }; 159 160 /** 161 * struct macsec_rx_sc - receive secure channel 162 * @sci: secure channel identifier for this SC 163 * @active: channel is active 164 * @sa: array of secure associations 165 * @stats: per-SC stats 166 */ 167 struct macsec_rx_sc { 168 struct macsec_rx_sc __rcu *next; 169 sci_t sci; 170 bool active; 171 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN]; 172 struct pcpu_rx_sc_stats __percpu *stats; 173 atomic_t refcnt; 174 struct rcu_head rcu_head; 175 }; 176 177 /** 178 * struct macsec_tx_sa - transmit secure association 179 * @active: 180 * @next_pn: packet number to use for the next packet 181 * @lock: protects next_pn manipulations 182 * @key: key structure 183 * @stats: per-SA stats 184 */ 185 struct macsec_tx_sa { 186 struct macsec_key key; 187 spinlock_t lock; 188 u32 next_pn; 189 atomic_t refcnt; 190 bool active; 191 struct macsec_tx_sa_stats __percpu *stats; 192 struct rcu_head rcu; 193 }; 194 195 struct pcpu_tx_sc_stats { 196 struct macsec_tx_sc_stats stats; 197 struct u64_stats_sync syncp; 198 }; 199 200 /** 201 * struct macsec_tx_sc - transmit secure channel 202 * @active: 203 * @encoding_sa: association number of the SA currently in use 204 * @encrypt: encrypt packets on transmit, or authenticate only 205 * @send_sci: always include the SCI in the SecTAG 206 * @end_station: 207 * @scb: single copy broadcast flag 208 * @sa: array of secure associations 209 * @stats: stats for this TXSC 210 */ 211 struct macsec_tx_sc { 212 bool active; 213 u8 encoding_sa; 214 bool encrypt; 215 bool send_sci; 216 bool end_station; 217 bool scb; 218 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN]; 219 struct pcpu_tx_sc_stats __percpu *stats; 220 }; 221 222 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT 223 224 /** 225 * struct macsec_secy - MACsec Security Entity 226 * @netdev: netdevice for this SecY 227 * @n_rx_sc: number of receive secure channels configured on this SecY 228 * @sci: secure channel identifier used for tx 229 * @key_len: length of keys used by the cipher suite 230 * @icv_len: length of ICV used by the cipher suite 231 * @validate_frames: validation mode 232 * @operational: MAC_Operational flag 233 * @protect_frames: enable protection for this SecY 234 * @replay_protect: enable packet number checks on receive 235 * @replay_window: size of the replay window 236 * @tx_sc: transmit secure channel 237 * @rx_sc: linked list of receive secure channels 238 */ 239 struct macsec_secy { 240 struct net_device *netdev; 241 unsigned int n_rx_sc; 242 sci_t sci; 243 u16 key_len; 244 u16 icv_len; 245 enum macsec_validation_type validate_frames; 246 bool operational; 247 bool protect_frames; 248 bool replay_protect; 249 u32 replay_window; 250 struct macsec_tx_sc tx_sc; 251 struct macsec_rx_sc __rcu *rx_sc; 252 }; 253 254 struct pcpu_secy_stats { 255 struct macsec_dev_stats stats; 256 struct u64_stats_sync syncp; 257 }; 258 259 /** 260 * struct macsec_dev - private data 261 * @secy: SecY config 262 * @real_dev: pointer to underlying netdevice 263 * @stats: MACsec device stats 264 * @secys: linked list of SecY's on the underlying device 265 */ 266 struct macsec_dev { 267 struct macsec_secy secy; 268 struct net_device *real_dev; 269 struct pcpu_secy_stats __percpu *stats; 270 struct list_head secys; 271 }; 272 273 /** 274 * struct macsec_rxh_data - rx_handler private argument 275 * @secys: linked list of SecY's on this underlying device 276 */ 277 struct macsec_rxh_data { 278 struct list_head secys; 279 }; 280 281 static struct macsec_dev *macsec_priv(const struct net_device *dev) 282 { 283 return (struct macsec_dev *)netdev_priv(dev); 284 } 285 286 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev) 287 { 288 return rcu_dereference_bh(dev->rx_handler_data); 289 } 290 291 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev) 292 { 293 return rtnl_dereference(dev->rx_handler_data); 294 } 295 296 struct macsec_cb { 297 struct aead_request *req; 298 union { 299 struct macsec_tx_sa *tx_sa; 300 struct macsec_rx_sa *rx_sa; 301 }; 302 u8 assoc_num; 303 bool valid; 304 bool has_sci; 305 }; 306 307 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr) 308 { 309 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr); 310 311 if (!sa || !sa->active) 312 return NULL; 313 314 if (!atomic_inc_not_zero(&sa->refcnt)) 315 return NULL; 316 317 return sa; 318 } 319 320 static void free_rx_sc_rcu(struct rcu_head *head) 321 { 322 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head); 323 324 free_percpu(rx_sc->stats); 325 kfree(rx_sc); 326 } 327 328 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc) 329 { 330 return atomic_inc_not_zero(&sc->refcnt) ? sc : NULL; 331 } 332 333 static void macsec_rxsc_put(struct macsec_rx_sc *sc) 334 { 335 if (atomic_dec_and_test(&sc->refcnt)) 336 call_rcu(&sc->rcu_head, free_rx_sc_rcu); 337 } 338 339 static void free_rxsa(struct rcu_head *head) 340 { 341 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu); 342 343 crypto_free_aead(sa->key.tfm); 344 free_percpu(sa->stats); 345 macsec_rxsc_put(sa->sc); 346 kfree(sa); 347 } 348 349 static void macsec_rxsa_put(struct macsec_rx_sa *sa) 350 { 351 if (atomic_dec_and_test(&sa->refcnt)) 352 call_rcu(&sa->rcu, free_rxsa); 353 } 354 355 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr) 356 { 357 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr); 358 359 if (!sa || !sa->active) 360 return NULL; 361 362 if (!atomic_inc_not_zero(&sa->refcnt)) 363 return NULL; 364 365 return sa; 366 } 367 368 static void free_txsa(struct rcu_head *head) 369 { 370 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu); 371 372 crypto_free_aead(sa->key.tfm); 373 free_percpu(sa->stats); 374 kfree(sa); 375 } 376 377 static void macsec_txsa_put(struct macsec_tx_sa *sa) 378 { 379 if (atomic_dec_and_test(&sa->refcnt)) 380 call_rcu(&sa->rcu, free_txsa); 381 } 382 383 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) 384 { 385 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); 386 return (struct macsec_cb *)skb->cb; 387 } 388 389 #define MACSEC_PORT_ES (htons(0x0001)) 390 #define MACSEC_PORT_SCB (0x0000) 391 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL) 392 393 #define DEFAULT_SAK_LEN 16 394 #define DEFAULT_SEND_SCI true 395 #define DEFAULT_ENCRYPT false 396 #define DEFAULT_ENCODING_SA 0 397 398 static sci_t make_sci(u8 *addr, __be16 port) 399 { 400 sci_t sci; 401 402 memcpy(&sci, addr, ETH_ALEN); 403 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); 404 405 return sci; 406 } 407 408 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present) 409 { 410 sci_t sci; 411 412 if (sci_present) 413 memcpy(&sci, hdr->secure_channel_id, 414 sizeof(hdr->secure_channel_id)); 415 else 416 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); 417 418 return sci; 419 } 420 421 static unsigned int macsec_sectag_len(bool sci_present) 422 { 423 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); 424 } 425 426 static unsigned int macsec_hdr_len(bool sci_present) 427 { 428 return macsec_sectag_len(sci_present) + ETH_HLEN; 429 } 430 431 static unsigned int macsec_extra_len(bool sci_present) 432 { 433 return macsec_sectag_len(sci_present) + sizeof(__be16); 434 } 435 436 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ 437 static void macsec_fill_sectag(struct macsec_eth_header *h, 438 const struct macsec_secy *secy, u32 pn) 439 { 440 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 441 442 memset(&h->tci_an, 0, macsec_sectag_len(tx_sc->send_sci)); 443 h->eth.h_proto = htons(ETH_P_MACSEC); 444 445 if (tx_sc->send_sci || 446 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb)) { 447 h->tci_an |= MACSEC_TCI_SC; 448 memcpy(&h->secure_channel_id, &secy->sci, 449 sizeof(h->secure_channel_id)); 450 } else { 451 if (tx_sc->end_station) 452 h->tci_an |= MACSEC_TCI_ES; 453 if (tx_sc->scb) 454 h->tci_an |= MACSEC_TCI_SCB; 455 } 456 457 h->packet_number = htonl(pn); 458 459 /* with GCM, C/E clear for !encrypt, both set for encrypt */ 460 if (tx_sc->encrypt) 461 h->tci_an |= MACSEC_TCI_CONFID; 462 else if (secy->icv_len != DEFAULT_ICV_LEN) 463 h->tci_an |= MACSEC_TCI_C; 464 465 h->tci_an |= tx_sc->encoding_sa; 466 } 467 468 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) 469 { 470 if (data_len < MIN_NON_SHORT_LEN) 471 h->short_length = data_len; 472 } 473 474 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */ 475 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len) 476 { 477 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; 478 int len = skb->len - 2 * ETH_ALEN; 479 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; 480 481 /* a) It comprises at least 17 octets */ 482 if (skb->len <= 16) 483 return false; 484 485 /* b) MACsec EtherType: already checked */ 486 487 /* c) V bit is clear */ 488 if (h->tci_an & MACSEC_TCI_VERSION) 489 return false; 490 491 /* d) ES or SCB => !SC */ 492 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && 493 (h->tci_an & MACSEC_TCI_SC)) 494 return false; 495 496 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ 497 if (h->unused) 498 return false; 499 500 /* rx.pn != 0 (figure 10-5) */ 501 if (!h->packet_number) 502 return false; 503 504 /* length check, f) g) h) i) */ 505 if (h->short_length) 506 return len == extra_len + h->short_length; 507 return len >= extra_len + MIN_NON_SHORT_LEN; 508 } 509 510 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) 511 #define MACSEC_NEEDED_TAILROOM MACSEC_MAX_ICV_LEN 512 513 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) 514 { 515 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; 516 517 gcm_iv->sci = sci; 518 gcm_iv->pn = htonl(pn); 519 } 520 521 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) 522 { 523 return (struct macsec_eth_header *)skb_mac_header(skb); 524 } 525 526 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy) 527 { 528 u32 pn; 529 530 spin_lock_bh(&tx_sa->lock); 531 pn = tx_sa->next_pn; 532 533 tx_sa->next_pn++; 534 if (tx_sa->next_pn == 0) { 535 pr_debug("PN wrapped, transitioning to !oper\n"); 536 tx_sa->active = false; 537 if (secy->protect_frames) 538 secy->operational = false; 539 } 540 spin_unlock_bh(&tx_sa->lock); 541 542 return pn; 543 } 544 545 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) 546 { 547 struct macsec_dev *macsec = netdev_priv(dev); 548 549 skb->dev = macsec->real_dev; 550 skb_reset_mac_header(skb); 551 skb->protocol = eth_hdr(skb)->h_proto; 552 } 553 554 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, 555 struct macsec_tx_sa *tx_sa) 556 { 557 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); 558 559 u64_stats_update_begin(&txsc_stats->syncp); 560 if (tx_sc->encrypt) { 561 txsc_stats->stats.OutOctetsEncrypted += skb->len; 562 txsc_stats->stats.OutPktsEncrypted++; 563 this_cpu_inc(tx_sa->stats->OutPktsEncrypted); 564 } else { 565 txsc_stats->stats.OutOctetsProtected += skb->len; 566 txsc_stats->stats.OutPktsProtected++; 567 this_cpu_inc(tx_sa->stats->OutPktsProtected); 568 } 569 u64_stats_update_end(&txsc_stats->syncp); 570 } 571 572 static void count_tx(struct net_device *dev, int ret, int len) 573 { 574 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 575 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 576 577 u64_stats_update_begin(&stats->syncp); 578 stats->tx_packets++; 579 stats->tx_bytes += len; 580 u64_stats_update_end(&stats->syncp); 581 } else { 582 dev->stats.tx_dropped++; 583 } 584 } 585 586 static void macsec_encrypt_done(struct crypto_async_request *base, int err) 587 { 588 struct sk_buff *skb = base->data; 589 struct net_device *dev = skb->dev; 590 struct macsec_dev *macsec = macsec_priv(dev); 591 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 592 int len, ret; 593 594 aead_request_free(macsec_skb_cb(skb)->req); 595 596 rcu_read_lock_bh(); 597 macsec_encrypt_finish(skb, dev); 598 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 599 len = skb->len; 600 ret = dev_queue_xmit(skb); 601 count_tx(dev, ret, len); 602 rcu_read_unlock_bh(); 603 604 macsec_txsa_put(sa); 605 dev_put(dev); 606 } 607 608 static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 609 struct net_device *dev) 610 { 611 int ret; 612 struct scatterlist sg[MAX_SKB_FRAGS + 1]; 613 unsigned char iv[GCM_AES_IV_LEN]; 614 struct ethhdr *eth; 615 struct macsec_eth_header *hh; 616 size_t unprotected_len; 617 struct aead_request *req; 618 struct macsec_secy *secy; 619 struct macsec_tx_sc *tx_sc; 620 struct macsec_tx_sa *tx_sa; 621 struct macsec_dev *macsec = macsec_priv(dev); 622 u32 pn; 623 624 secy = &macsec->secy; 625 tx_sc = &secy->tx_sc; 626 627 /* 10.5.1 TX SA assignment */ 628 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); 629 if (!tx_sa) { 630 secy->operational = false; 631 kfree_skb(skb); 632 return ERR_PTR(-EINVAL); 633 } 634 635 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || 636 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { 637 struct sk_buff *nskb = skb_copy_expand(skb, 638 MACSEC_NEEDED_HEADROOM, 639 MACSEC_NEEDED_TAILROOM, 640 GFP_ATOMIC); 641 if (likely(nskb)) { 642 consume_skb(skb); 643 skb = nskb; 644 } else { 645 macsec_txsa_put(tx_sa); 646 kfree_skb(skb); 647 return ERR_PTR(-ENOMEM); 648 } 649 } else { 650 skb = skb_unshare(skb, GFP_ATOMIC); 651 if (!skb) { 652 macsec_txsa_put(tx_sa); 653 return ERR_PTR(-ENOMEM); 654 } 655 } 656 657 unprotected_len = skb->len; 658 eth = eth_hdr(skb); 659 hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(tx_sc->send_sci)); 660 memmove(hh, eth, 2 * ETH_ALEN); 661 662 pn = tx_sa_update_pn(tx_sa, secy); 663 if (pn == 0) { 664 macsec_txsa_put(tx_sa); 665 kfree_skb(skb); 666 return ERR_PTR(-ENOLINK); 667 } 668 macsec_fill_sectag(hh, secy, pn); 669 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); 670 671 macsec_fill_iv(iv, secy->sci, pn); 672 673 skb_put(skb, secy->icv_len); 674 675 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { 676 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 677 678 u64_stats_update_begin(&secy_stats->syncp); 679 secy_stats->stats.OutPktsTooLong++; 680 u64_stats_update_end(&secy_stats->syncp); 681 682 macsec_txsa_put(tx_sa); 683 kfree_skb(skb); 684 return ERR_PTR(-EINVAL); 685 } 686 687 req = aead_request_alloc(tx_sa->key.tfm, GFP_ATOMIC); 688 if (!req) { 689 macsec_txsa_put(tx_sa); 690 kfree_skb(skb); 691 return ERR_PTR(-ENOMEM); 692 } 693 694 sg_init_table(sg, MAX_SKB_FRAGS + 1); 695 skb_to_sgvec(skb, sg, 0, skb->len); 696 697 if (tx_sc->encrypt) { 698 int len = skb->len - macsec_hdr_len(tx_sc->send_sci) - 699 secy->icv_len; 700 aead_request_set_crypt(req, sg, sg, len, iv); 701 aead_request_set_ad(req, macsec_hdr_len(tx_sc->send_sci)); 702 } else { 703 aead_request_set_crypt(req, sg, sg, 0, iv); 704 aead_request_set_ad(req, skb->len - secy->icv_len); 705 } 706 707 macsec_skb_cb(skb)->req = req; 708 macsec_skb_cb(skb)->tx_sa = tx_sa; 709 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 710 711 dev_hold(skb->dev); 712 ret = crypto_aead_encrypt(req); 713 if (ret == -EINPROGRESS) { 714 return ERR_PTR(ret); 715 } else if (ret != 0) { 716 dev_put(skb->dev); 717 kfree_skb(skb); 718 aead_request_free(req); 719 macsec_txsa_put(tx_sa); 720 return ERR_PTR(-EINVAL); 721 } 722 723 dev_put(skb->dev); 724 aead_request_free(req); 725 macsec_txsa_put(tx_sa); 726 727 return skb; 728 } 729 730 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 731 { 732 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 733 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 734 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 735 u32 lowest_pn = 0; 736 737 spin_lock(&rx_sa->lock); 738 if (rx_sa->next_pn >= secy->replay_window) 739 lowest_pn = rx_sa->next_pn - secy->replay_window; 740 741 /* Now perform replay protection check again 742 * (see IEEE 802.1AE-2006 figure 10-5) 743 */ 744 if (secy->replay_protect && pn < lowest_pn) { 745 spin_unlock(&rx_sa->lock); 746 u64_stats_update_begin(&rxsc_stats->syncp); 747 rxsc_stats->stats.InPktsLate++; 748 u64_stats_update_end(&rxsc_stats->syncp); 749 return false; 750 } 751 752 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 753 u64_stats_update_begin(&rxsc_stats->syncp); 754 if (hdr->tci_an & MACSEC_TCI_E) 755 rxsc_stats->stats.InOctetsDecrypted += skb->len; 756 else 757 rxsc_stats->stats.InOctetsValidated += skb->len; 758 u64_stats_update_end(&rxsc_stats->syncp); 759 } 760 761 if (!macsec_skb_cb(skb)->valid) { 762 spin_unlock(&rx_sa->lock); 763 764 /* 10.6.5 */ 765 if (hdr->tci_an & MACSEC_TCI_C || 766 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 767 u64_stats_update_begin(&rxsc_stats->syncp); 768 rxsc_stats->stats.InPktsNotValid++; 769 u64_stats_update_end(&rxsc_stats->syncp); 770 return false; 771 } 772 773 u64_stats_update_begin(&rxsc_stats->syncp); 774 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 775 rxsc_stats->stats.InPktsInvalid++; 776 this_cpu_inc(rx_sa->stats->InPktsInvalid); 777 } else if (pn < lowest_pn) { 778 rxsc_stats->stats.InPktsDelayed++; 779 } else { 780 rxsc_stats->stats.InPktsUnchecked++; 781 } 782 u64_stats_update_end(&rxsc_stats->syncp); 783 } else { 784 u64_stats_update_begin(&rxsc_stats->syncp); 785 if (pn < lowest_pn) { 786 rxsc_stats->stats.InPktsDelayed++; 787 } else { 788 rxsc_stats->stats.InPktsOK++; 789 this_cpu_inc(rx_sa->stats->InPktsOK); 790 } 791 u64_stats_update_end(&rxsc_stats->syncp); 792 793 if (pn >= rx_sa->next_pn) 794 rx_sa->next_pn = pn + 1; 795 spin_unlock(&rx_sa->lock); 796 } 797 798 return true; 799 } 800 801 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 802 { 803 skb->pkt_type = PACKET_HOST; 804 skb->protocol = eth_type_trans(skb, dev); 805 806 skb_reset_network_header(skb); 807 if (!skb_transport_header_was_set(skb)) 808 skb_reset_transport_header(skb); 809 skb_reset_mac_len(skb); 810 } 811 812 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 813 { 814 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 815 skb_pull(skb, hdr_len); 816 pskb_trim_unique(skb, skb->len - icv_len); 817 } 818 819 static void count_rx(struct net_device *dev, int len) 820 { 821 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 822 823 u64_stats_update_begin(&stats->syncp); 824 stats->rx_packets++; 825 stats->rx_bytes += len; 826 u64_stats_update_end(&stats->syncp); 827 } 828 829 static void macsec_decrypt_done(struct crypto_async_request *base, int err) 830 { 831 struct sk_buff *skb = base->data; 832 struct net_device *dev = skb->dev; 833 struct macsec_dev *macsec = macsec_priv(dev); 834 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 835 int len, ret; 836 u32 pn; 837 838 aead_request_free(macsec_skb_cb(skb)->req); 839 840 rcu_read_lock_bh(); 841 pn = ntohl(macsec_ethhdr(skb)->packet_number); 842 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 843 rcu_read_unlock_bh(); 844 kfree_skb(skb); 845 goto out; 846 } 847 848 macsec_finalize_skb(skb, macsec->secy.icv_len, 849 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 850 macsec_reset_skb(skb, macsec->secy.netdev); 851 852 len = skb->len; 853 ret = netif_rx(skb); 854 if (ret == NET_RX_SUCCESS) 855 count_rx(dev, len); 856 else 857 macsec->secy.netdev->stats.rx_dropped++; 858 859 rcu_read_unlock_bh(); 860 861 out: 862 macsec_rxsa_put(rx_sa); 863 dev_put(dev); 864 return; 865 } 866 867 static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 868 struct net_device *dev, 869 struct macsec_rx_sa *rx_sa, 870 sci_t sci, 871 struct macsec_secy *secy) 872 { 873 int ret; 874 struct scatterlist sg[MAX_SKB_FRAGS + 1]; 875 unsigned char iv[GCM_AES_IV_LEN]; 876 struct aead_request *req; 877 struct macsec_eth_header *hdr; 878 u16 icv_len = secy->icv_len; 879 880 macsec_skb_cb(skb)->valid = false; 881 skb = skb_share_check(skb, GFP_ATOMIC); 882 if (!skb) 883 return ERR_PTR(-ENOMEM); 884 885 req = aead_request_alloc(rx_sa->key.tfm, GFP_ATOMIC); 886 if (!req) { 887 kfree_skb(skb); 888 return ERR_PTR(-ENOMEM); 889 } 890 891 hdr = (struct macsec_eth_header *)skb->data; 892 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number)); 893 894 sg_init_table(sg, MAX_SKB_FRAGS + 1); 895 skb_to_sgvec(skb, sg, 0, skb->len); 896 897 if (hdr->tci_an & MACSEC_TCI_E) { 898 /* confidentiality: ethernet + macsec header 899 * authenticated, encrypted payload 900 */ 901 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 902 903 aead_request_set_crypt(req, sg, sg, len, iv); 904 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 905 skb = skb_unshare(skb, GFP_ATOMIC); 906 if (!skb) { 907 aead_request_free(req); 908 return ERR_PTR(-ENOMEM); 909 } 910 } else { 911 /* integrity only: all headers + data authenticated */ 912 aead_request_set_crypt(req, sg, sg, icv_len, iv); 913 aead_request_set_ad(req, skb->len - icv_len); 914 } 915 916 macsec_skb_cb(skb)->req = req; 917 macsec_skb_cb(skb)->rx_sa = rx_sa; 918 skb->dev = dev; 919 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 920 921 dev_hold(dev); 922 ret = crypto_aead_decrypt(req); 923 if (ret == -EINPROGRESS) { 924 return ERR_PTR(ret); 925 } else if (ret != 0) { 926 /* decryption/authentication failed 927 * 10.6 if validateFrames is disabled, deliver anyway 928 */ 929 if (ret != -EBADMSG) { 930 kfree_skb(skb); 931 skb = ERR_PTR(ret); 932 } 933 } else { 934 macsec_skb_cb(skb)->valid = true; 935 } 936 dev_put(dev); 937 938 aead_request_free(req); 939 940 return skb; 941 } 942 943 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 944 { 945 struct macsec_rx_sc *rx_sc; 946 947 for_each_rxsc(secy, rx_sc) { 948 if (rx_sc->sci == sci) 949 return rx_sc; 950 } 951 952 return NULL; 953 } 954 955 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 956 { 957 struct macsec_rx_sc *rx_sc; 958 959 for_each_rxsc_rtnl(secy, rx_sc) { 960 if (rx_sc->sci == sci) 961 return rx_sc; 962 } 963 964 return NULL; 965 } 966 967 static void handle_not_macsec(struct sk_buff *skb) 968 { 969 struct macsec_rxh_data *rxd; 970 struct macsec_dev *macsec; 971 972 rcu_read_lock(); 973 rxd = macsec_data_rcu(skb->dev); 974 975 /* 10.6 If the management control validateFrames is not 976 * Strict, frames without a SecTAG are received, counted, and 977 * delivered to the Controlled Port 978 */ 979 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 980 struct sk_buff *nskb; 981 int ret; 982 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 983 984 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 985 u64_stats_update_begin(&secy_stats->syncp); 986 secy_stats->stats.InPktsNoTag++; 987 u64_stats_update_end(&secy_stats->syncp); 988 continue; 989 } 990 991 /* deliver on this port */ 992 nskb = skb_clone(skb, GFP_ATOMIC); 993 if (!nskb) 994 break; 995 996 nskb->dev = macsec->secy.netdev; 997 998 ret = netif_rx(nskb); 999 if (ret == NET_RX_SUCCESS) { 1000 u64_stats_update_begin(&secy_stats->syncp); 1001 secy_stats->stats.InPktsUntagged++; 1002 u64_stats_update_end(&secy_stats->syncp); 1003 } else { 1004 macsec->secy.netdev->stats.rx_dropped++; 1005 } 1006 } 1007 1008 rcu_read_unlock(); 1009 } 1010 1011 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 1012 { 1013 struct sk_buff *skb = *pskb; 1014 struct net_device *dev = skb->dev; 1015 struct macsec_eth_header *hdr; 1016 struct macsec_secy *secy = NULL; 1017 struct macsec_rx_sc *rx_sc; 1018 struct macsec_rx_sa *rx_sa; 1019 struct macsec_rxh_data *rxd; 1020 struct macsec_dev *macsec; 1021 sci_t sci; 1022 u32 pn; 1023 bool cbit; 1024 struct pcpu_rx_sc_stats *rxsc_stats; 1025 struct pcpu_secy_stats *secy_stats; 1026 bool pulled_sci; 1027 1028 if (skb_headroom(skb) < ETH_HLEN) 1029 goto drop_direct; 1030 1031 hdr = macsec_ethhdr(skb); 1032 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) { 1033 handle_not_macsec(skb); 1034 1035 /* and deliver to the uncontrolled port */ 1036 return RX_HANDLER_PASS; 1037 } 1038 1039 skb = skb_unshare(skb, GFP_ATOMIC); 1040 if (!skb) { 1041 *pskb = NULL; 1042 return RX_HANDLER_CONSUMED; 1043 } 1044 1045 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1046 if (!pulled_sci) { 1047 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1048 goto drop_direct; 1049 } 1050 1051 hdr = macsec_ethhdr(skb); 1052 1053 /* Frames with a SecTAG that has the TCI E bit set but the C 1054 * bit clear are discarded, as this reserved encoding is used 1055 * to identify frames with a SecTAG that are not to be 1056 * delivered to the Controlled Port. 1057 */ 1058 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1059 return RX_HANDLER_PASS; 1060 1061 /* now, pull the extra length */ 1062 if (hdr->tci_an & MACSEC_TCI_SC) { 1063 if (!pulled_sci) 1064 goto drop_direct; 1065 } 1066 1067 /* ethernet header is part of crypto processing */ 1068 skb_push(skb, ETH_HLEN); 1069 1070 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1071 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1072 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci); 1073 1074 rcu_read_lock(); 1075 rxd = macsec_data_rcu(skb->dev); 1076 1077 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1078 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1079 1080 if (sc) { 1081 secy = &macsec->secy; 1082 rx_sc = sc; 1083 break; 1084 } 1085 } 1086 1087 if (!secy) 1088 goto nosci; 1089 1090 dev = secy->netdev; 1091 macsec = macsec_priv(dev); 1092 secy_stats = this_cpu_ptr(macsec->stats); 1093 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1094 1095 if (!macsec_validate_skb(skb, secy->icv_len)) { 1096 u64_stats_update_begin(&secy_stats->syncp); 1097 secy_stats->stats.InPktsBadTag++; 1098 u64_stats_update_end(&secy_stats->syncp); 1099 goto drop_nosa; 1100 } 1101 1102 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1103 if (!rx_sa) { 1104 /* 10.6.1 if the SA is not in use */ 1105 1106 /* If validateFrames is Strict or the C bit in the 1107 * SecTAG is set, discard 1108 */ 1109 if (hdr->tci_an & MACSEC_TCI_C || 1110 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1111 u64_stats_update_begin(&rxsc_stats->syncp); 1112 rxsc_stats->stats.InPktsNotUsingSA++; 1113 u64_stats_update_end(&rxsc_stats->syncp); 1114 goto drop_nosa; 1115 } 1116 1117 /* not Strict, the frame (with the SecTAG and ICV 1118 * removed) is delivered to the Controlled Port. 1119 */ 1120 u64_stats_update_begin(&rxsc_stats->syncp); 1121 rxsc_stats->stats.InPktsUnusedSA++; 1122 u64_stats_update_end(&rxsc_stats->syncp); 1123 goto deliver; 1124 } 1125 1126 /* First, PN check to avoid decrypting obviously wrong packets */ 1127 pn = ntohl(hdr->packet_number); 1128 if (secy->replay_protect) { 1129 bool late; 1130 1131 spin_lock(&rx_sa->lock); 1132 late = rx_sa->next_pn >= secy->replay_window && 1133 pn < (rx_sa->next_pn - secy->replay_window); 1134 spin_unlock(&rx_sa->lock); 1135 1136 if (late) { 1137 u64_stats_update_begin(&rxsc_stats->syncp); 1138 rxsc_stats->stats.InPktsLate++; 1139 u64_stats_update_end(&rxsc_stats->syncp); 1140 goto drop; 1141 } 1142 } 1143 1144 /* Disabled && !changed text => skip validation */ 1145 if (hdr->tci_an & MACSEC_TCI_C || 1146 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1147 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1148 1149 if (IS_ERR(skb)) { 1150 /* the decrypt callback needs the reference */ 1151 if (PTR_ERR(skb) != -EINPROGRESS) 1152 macsec_rxsa_put(rx_sa); 1153 rcu_read_unlock(); 1154 *pskb = NULL; 1155 return RX_HANDLER_CONSUMED; 1156 } 1157 1158 if (!macsec_post_decrypt(skb, secy, pn)) 1159 goto drop; 1160 1161 deliver: 1162 macsec_finalize_skb(skb, secy->icv_len, 1163 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1164 macsec_reset_skb(skb, secy->netdev); 1165 1166 if (rx_sa) 1167 macsec_rxsa_put(rx_sa); 1168 count_rx(dev, skb->len); 1169 1170 rcu_read_unlock(); 1171 1172 *pskb = skb; 1173 return RX_HANDLER_ANOTHER; 1174 1175 drop: 1176 macsec_rxsa_put(rx_sa); 1177 drop_nosa: 1178 rcu_read_unlock(); 1179 drop_direct: 1180 kfree_skb(skb); 1181 *pskb = NULL; 1182 return RX_HANDLER_CONSUMED; 1183 1184 nosci: 1185 /* 10.6.1 if the SC is not found */ 1186 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1187 if (!cbit) 1188 macsec_finalize_skb(skb, DEFAULT_ICV_LEN, 1189 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1190 1191 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1192 struct sk_buff *nskb; 1193 int ret; 1194 1195 secy_stats = this_cpu_ptr(macsec->stats); 1196 1197 /* If validateFrames is Strict or the C bit in the 1198 * SecTAG is set, discard 1199 */ 1200 if (cbit || 1201 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1202 u64_stats_update_begin(&secy_stats->syncp); 1203 secy_stats->stats.InPktsNoSCI++; 1204 u64_stats_update_end(&secy_stats->syncp); 1205 continue; 1206 } 1207 1208 /* not strict, the frame (with the SecTAG and ICV 1209 * removed) is delivered to the Controlled Port. 1210 */ 1211 nskb = skb_clone(skb, GFP_ATOMIC); 1212 if (!nskb) 1213 break; 1214 1215 macsec_reset_skb(nskb, macsec->secy.netdev); 1216 1217 ret = netif_rx(nskb); 1218 if (ret == NET_RX_SUCCESS) { 1219 u64_stats_update_begin(&secy_stats->syncp); 1220 secy_stats->stats.InPktsUnknownSCI++; 1221 u64_stats_update_end(&secy_stats->syncp); 1222 } else { 1223 macsec->secy.netdev->stats.rx_dropped++; 1224 } 1225 } 1226 1227 rcu_read_unlock(); 1228 *pskb = skb; 1229 return RX_HANDLER_PASS; 1230 } 1231 1232 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1233 { 1234 struct crypto_aead *tfm; 1235 int ret; 1236 1237 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC); 1238 if (!tfm || IS_ERR(tfm)) 1239 return NULL; 1240 1241 ret = crypto_aead_setkey(tfm, key, key_len); 1242 if (ret < 0) { 1243 crypto_free_aead(tfm); 1244 return NULL; 1245 } 1246 1247 ret = crypto_aead_setauthsize(tfm, icv_len); 1248 if (ret < 0) { 1249 crypto_free_aead(tfm); 1250 return NULL; 1251 } 1252 1253 return tfm; 1254 } 1255 1256 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1257 int icv_len) 1258 { 1259 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1260 if (!rx_sa->stats) 1261 return -1; 1262 1263 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1264 if (!rx_sa->key.tfm) { 1265 free_percpu(rx_sa->stats); 1266 return -1; 1267 } 1268 1269 rx_sa->active = false; 1270 rx_sa->next_pn = 1; 1271 atomic_set(&rx_sa->refcnt, 1); 1272 spin_lock_init(&rx_sa->lock); 1273 1274 return 0; 1275 } 1276 1277 static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1278 { 1279 rx_sa->active = false; 1280 1281 macsec_rxsa_put(rx_sa); 1282 } 1283 1284 static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1285 { 1286 int i; 1287 1288 for (i = 0; i < MACSEC_NUM_AN; i++) { 1289 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1290 1291 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1292 if (sa) 1293 clear_rx_sa(sa); 1294 } 1295 1296 macsec_rxsc_put(rx_sc); 1297 } 1298 1299 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1300 { 1301 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1302 1303 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1304 rx_sc; 1305 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1306 if (rx_sc->sci == sci) { 1307 if (rx_sc->active) 1308 secy->n_rx_sc--; 1309 rcu_assign_pointer(*rx_scp, rx_sc->next); 1310 return rx_sc; 1311 } 1312 } 1313 1314 return NULL; 1315 } 1316 1317 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci) 1318 { 1319 struct macsec_rx_sc *rx_sc; 1320 struct macsec_dev *macsec; 1321 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1322 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1323 struct macsec_secy *secy; 1324 1325 list_for_each_entry(macsec, &rxd->secys, secys) { 1326 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1327 return ERR_PTR(-EEXIST); 1328 } 1329 1330 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL); 1331 if (!rx_sc) 1332 return ERR_PTR(-ENOMEM); 1333 1334 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1335 if (!rx_sc->stats) { 1336 kfree(rx_sc); 1337 return ERR_PTR(-ENOMEM); 1338 } 1339 1340 rx_sc->sci = sci; 1341 rx_sc->active = true; 1342 atomic_set(&rx_sc->refcnt, 1); 1343 1344 secy = &macsec_priv(dev)->secy; 1345 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1346 rcu_assign_pointer(secy->rx_sc, rx_sc); 1347 1348 if (rx_sc->active) 1349 secy->n_rx_sc++; 1350 1351 return rx_sc; 1352 } 1353 1354 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1355 int icv_len) 1356 { 1357 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1358 if (!tx_sa->stats) 1359 return -1; 1360 1361 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1362 if (!tx_sa->key.tfm) { 1363 free_percpu(tx_sa->stats); 1364 return -1; 1365 } 1366 1367 tx_sa->active = false; 1368 atomic_set(&tx_sa->refcnt, 1); 1369 spin_lock_init(&tx_sa->lock); 1370 1371 return 0; 1372 } 1373 1374 static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1375 { 1376 tx_sa->active = false; 1377 1378 macsec_txsa_put(tx_sa); 1379 } 1380 1381 static struct genl_family macsec_fam = { 1382 .id = GENL_ID_GENERATE, 1383 .name = MACSEC_GENL_NAME, 1384 .hdrsize = 0, 1385 .version = MACSEC_GENL_VERSION, 1386 .maxattr = MACSEC_ATTR_MAX, 1387 .netnsok = true, 1388 }; 1389 1390 static struct net_device *get_dev_from_nl(struct net *net, 1391 struct nlattr **attrs) 1392 { 1393 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1394 struct net_device *dev; 1395 1396 dev = __dev_get_by_index(net, ifindex); 1397 if (!dev) 1398 return ERR_PTR(-ENODEV); 1399 1400 if (!netif_is_macsec(dev)) 1401 return ERR_PTR(-ENODEV); 1402 1403 return dev; 1404 } 1405 1406 static sci_t nla_get_sci(const struct nlattr *nla) 1407 { 1408 return (__force sci_t)nla_get_u64(nla); 1409 } 1410 1411 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value) 1412 { 1413 return nla_put_u64(skb, attrtype, (__force u64)value); 1414 } 1415 1416 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1417 struct nlattr **attrs, 1418 struct nlattr **tb_sa, 1419 struct net_device **devp, 1420 struct macsec_secy **secyp, 1421 struct macsec_tx_sc **scp, 1422 u8 *assoc_num) 1423 { 1424 struct net_device *dev; 1425 struct macsec_secy *secy; 1426 struct macsec_tx_sc *tx_sc; 1427 struct macsec_tx_sa *tx_sa; 1428 1429 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1430 return ERR_PTR(-EINVAL); 1431 1432 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1433 1434 dev = get_dev_from_nl(net, attrs); 1435 if (IS_ERR(dev)) 1436 return ERR_CAST(dev); 1437 1438 if (*assoc_num >= MACSEC_NUM_AN) 1439 return ERR_PTR(-EINVAL); 1440 1441 secy = &macsec_priv(dev)->secy; 1442 tx_sc = &secy->tx_sc; 1443 1444 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1445 if (!tx_sa) 1446 return ERR_PTR(-ENODEV); 1447 1448 *devp = dev; 1449 *scp = tx_sc; 1450 *secyp = secy; 1451 return tx_sa; 1452 } 1453 1454 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1455 struct nlattr **attrs, 1456 struct nlattr **tb_rxsc, 1457 struct net_device **devp, 1458 struct macsec_secy **secyp) 1459 { 1460 struct net_device *dev; 1461 struct macsec_secy *secy; 1462 struct macsec_rx_sc *rx_sc; 1463 sci_t sci; 1464 1465 dev = get_dev_from_nl(net, attrs); 1466 if (IS_ERR(dev)) 1467 return ERR_CAST(dev); 1468 1469 secy = &macsec_priv(dev)->secy; 1470 1471 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1472 return ERR_PTR(-EINVAL); 1473 1474 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1475 rx_sc = find_rx_sc_rtnl(secy, sci); 1476 if (!rx_sc) 1477 return ERR_PTR(-ENODEV); 1478 1479 *secyp = secy; 1480 *devp = dev; 1481 1482 return rx_sc; 1483 } 1484 1485 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1486 struct nlattr **attrs, 1487 struct nlattr **tb_rxsc, 1488 struct nlattr **tb_sa, 1489 struct net_device **devp, 1490 struct macsec_secy **secyp, 1491 struct macsec_rx_sc **scp, 1492 u8 *assoc_num) 1493 { 1494 struct macsec_rx_sc *rx_sc; 1495 struct macsec_rx_sa *rx_sa; 1496 1497 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1498 return ERR_PTR(-EINVAL); 1499 1500 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1501 if (*assoc_num >= MACSEC_NUM_AN) 1502 return ERR_PTR(-EINVAL); 1503 1504 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1505 if (IS_ERR(rx_sc)) 1506 return ERR_CAST(rx_sc); 1507 1508 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1509 if (!rx_sa) 1510 return ERR_PTR(-ENODEV); 1511 1512 *scp = rx_sc; 1513 return rx_sa; 1514 } 1515 1516 1517 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1518 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1519 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1520 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1521 }; 1522 1523 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1524 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1525 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, 1526 }; 1527 1528 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1529 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, 1530 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, 1531 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 }, 1532 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_U64 }, 1533 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1534 .len = MACSEC_MAX_KEY_LEN, }, 1535 }; 1536 1537 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1538 { 1539 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1540 return -EINVAL; 1541 1542 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], 1543 macsec_genl_sa_policy)) 1544 return -EINVAL; 1545 1546 return 0; 1547 } 1548 1549 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1550 { 1551 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1552 return -EINVAL; 1553 1554 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], 1555 macsec_genl_rxsc_policy)) 1556 return -EINVAL; 1557 1558 return 0; 1559 } 1560 1561 static bool validate_add_rxsa(struct nlattr **attrs) 1562 { 1563 if (!attrs[MACSEC_SA_ATTR_AN] || 1564 !attrs[MACSEC_SA_ATTR_KEY] || 1565 !attrs[MACSEC_SA_ATTR_KEYID]) 1566 return false; 1567 1568 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1569 return false; 1570 1571 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1572 return false; 1573 1574 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1575 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1576 return false; 1577 } 1578 1579 return true; 1580 } 1581 1582 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1583 { 1584 struct net_device *dev; 1585 struct nlattr **attrs = info->attrs; 1586 struct macsec_secy *secy; 1587 struct macsec_rx_sc *rx_sc; 1588 struct macsec_rx_sa *rx_sa; 1589 unsigned char assoc_num; 1590 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1591 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1592 1593 if (!attrs[MACSEC_ATTR_IFINDEX]) 1594 return -EINVAL; 1595 1596 if (parse_sa_config(attrs, tb_sa)) 1597 return -EINVAL; 1598 1599 if (parse_rxsc_config(attrs, tb_rxsc)) 1600 return -EINVAL; 1601 1602 if (!validate_add_rxsa(tb_sa)) 1603 return -EINVAL; 1604 1605 rtnl_lock(); 1606 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1607 if (IS_ERR(rx_sc) || !macsec_rxsc_get(rx_sc)) { 1608 rtnl_unlock(); 1609 return PTR_ERR(rx_sc); 1610 } 1611 1612 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1613 1614 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1615 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1616 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1617 rtnl_unlock(); 1618 return -EINVAL; 1619 } 1620 1621 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1622 if (rx_sa) { 1623 rtnl_unlock(); 1624 return -EBUSY; 1625 } 1626 1627 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1628 if (!rx_sa || init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1629 secy->key_len, secy->icv_len)) { 1630 kfree(rx_sa); 1631 rtnl_unlock(); 1632 return -ENOMEM; 1633 } 1634 1635 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1636 spin_lock_bh(&rx_sa->lock); 1637 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1638 spin_unlock_bh(&rx_sa->lock); 1639 } 1640 1641 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1642 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1643 1644 rx_sa->key.id = nla_get_u64(tb_sa[MACSEC_SA_ATTR_KEYID]); 1645 rx_sa->sc = rx_sc; 1646 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1647 1648 rtnl_unlock(); 1649 1650 return 0; 1651 } 1652 1653 static bool validate_add_rxsc(struct nlattr **attrs) 1654 { 1655 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1656 return false; 1657 1658 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1659 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1660 return false; 1661 } 1662 1663 return true; 1664 } 1665 1666 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1667 { 1668 struct net_device *dev; 1669 sci_t sci = MACSEC_UNDEF_SCI; 1670 struct nlattr **attrs = info->attrs; 1671 struct macsec_rx_sc *rx_sc; 1672 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1673 1674 if (!attrs[MACSEC_ATTR_IFINDEX]) 1675 return -EINVAL; 1676 1677 if (parse_rxsc_config(attrs, tb_rxsc)) 1678 return -EINVAL; 1679 1680 if (!validate_add_rxsc(tb_rxsc)) 1681 return -EINVAL; 1682 1683 rtnl_lock(); 1684 dev = get_dev_from_nl(genl_info_net(info), attrs); 1685 if (IS_ERR(dev)) { 1686 rtnl_unlock(); 1687 return PTR_ERR(dev); 1688 } 1689 1690 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1691 1692 rx_sc = create_rx_sc(dev, sci); 1693 if (IS_ERR(rx_sc)) { 1694 rtnl_unlock(); 1695 return PTR_ERR(rx_sc); 1696 } 1697 1698 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1699 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1700 1701 rtnl_unlock(); 1702 1703 return 0; 1704 } 1705 1706 static bool validate_add_txsa(struct nlattr **attrs) 1707 { 1708 if (!attrs[MACSEC_SA_ATTR_AN] || 1709 !attrs[MACSEC_SA_ATTR_PN] || 1710 !attrs[MACSEC_SA_ATTR_KEY] || 1711 !attrs[MACSEC_SA_ATTR_KEYID]) 1712 return false; 1713 1714 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1715 return false; 1716 1717 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1718 return false; 1719 1720 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1721 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1722 return false; 1723 } 1724 1725 return true; 1726 } 1727 1728 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1729 { 1730 struct net_device *dev; 1731 struct nlattr **attrs = info->attrs; 1732 struct macsec_secy *secy; 1733 struct macsec_tx_sc *tx_sc; 1734 struct macsec_tx_sa *tx_sa; 1735 unsigned char assoc_num; 1736 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1737 1738 if (!attrs[MACSEC_ATTR_IFINDEX]) 1739 return -EINVAL; 1740 1741 if (parse_sa_config(attrs, tb_sa)) 1742 return -EINVAL; 1743 1744 if (!validate_add_txsa(tb_sa)) 1745 return -EINVAL; 1746 1747 rtnl_lock(); 1748 dev = get_dev_from_nl(genl_info_net(info), attrs); 1749 if (IS_ERR(dev)) { 1750 rtnl_unlock(); 1751 return PTR_ERR(dev); 1752 } 1753 1754 secy = &macsec_priv(dev)->secy; 1755 tx_sc = &secy->tx_sc; 1756 1757 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1758 1759 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1760 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 1761 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1762 rtnl_unlock(); 1763 return -EINVAL; 1764 } 1765 1766 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 1767 if (tx_sa) { 1768 rtnl_unlock(); 1769 return -EBUSY; 1770 } 1771 1772 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 1773 if (!tx_sa || init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1774 secy->key_len, secy->icv_len)) { 1775 kfree(tx_sa); 1776 rtnl_unlock(); 1777 return -ENOMEM; 1778 } 1779 1780 tx_sa->key.id = nla_get_u64(tb_sa[MACSEC_SA_ATTR_KEYID]); 1781 1782 spin_lock_bh(&tx_sa->lock); 1783 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1784 spin_unlock_bh(&tx_sa->lock); 1785 1786 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1787 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1788 1789 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 1790 secy->operational = true; 1791 1792 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 1793 1794 rtnl_unlock(); 1795 1796 return 0; 1797 } 1798 1799 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 1800 { 1801 struct nlattr **attrs = info->attrs; 1802 struct net_device *dev; 1803 struct macsec_secy *secy; 1804 struct macsec_rx_sc *rx_sc; 1805 struct macsec_rx_sa *rx_sa; 1806 u8 assoc_num; 1807 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1808 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1809 1810 if (!attrs[MACSEC_ATTR_IFINDEX]) 1811 return -EINVAL; 1812 1813 if (parse_sa_config(attrs, tb_sa)) 1814 return -EINVAL; 1815 1816 if (parse_rxsc_config(attrs, tb_rxsc)) 1817 return -EINVAL; 1818 1819 rtnl_lock(); 1820 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 1821 &dev, &secy, &rx_sc, &assoc_num); 1822 if (IS_ERR(rx_sa)) { 1823 rtnl_unlock(); 1824 return PTR_ERR(rx_sa); 1825 } 1826 1827 if (rx_sa->active) { 1828 rtnl_unlock(); 1829 return -EBUSY; 1830 } 1831 1832 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 1833 clear_rx_sa(rx_sa); 1834 1835 rtnl_unlock(); 1836 1837 return 0; 1838 } 1839 1840 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 1841 { 1842 struct nlattr **attrs = info->attrs; 1843 struct net_device *dev; 1844 struct macsec_secy *secy; 1845 struct macsec_rx_sc *rx_sc; 1846 sci_t sci; 1847 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1848 1849 if (!attrs[MACSEC_ATTR_IFINDEX]) 1850 return -EINVAL; 1851 1852 if (parse_rxsc_config(attrs, tb_rxsc)) 1853 return -EINVAL; 1854 1855 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1856 return -EINVAL; 1857 1858 rtnl_lock(); 1859 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 1860 if (IS_ERR(dev)) { 1861 rtnl_unlock(); 1862 return PTR_ERR(dev); 1863 } 1864 1865 secy = &macsec_priv(dev)->secy; 1866 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1867 1868 rx_sc = del_rx_sc(secy, sci); 1869 if (!rx_sc) { 1870 rtnl_unlock(); 1871 return -ENODEV; 1872 } 1873 1874 free_rx_sc(rx_sc); 1875 rtnl_unlock(); 1876 1877 return 0; 1878 } 1879 1880 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 1881 { 1882 struct nlattr **attrs = info->attrs; 1883 struct net_device *dev; 1884 struct macsec_secy *secy; 1885 struct macsec_tx_sc *tx_sc; 1886 struct macsec_tx_sa *tx_sa; 1887 u8 assoc_num; 1888 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1889 1890 if (!attrs[MACSEC_ATTR_IFINDEX]) 1891 return -EINVAL; 1892 1893 if (parse_sa_config(attrs, tb_sa)) 1894 return -EINVAL; 1895 1896 rtnl_lock(); 1897 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 1898 &dev, &secy, &tx_sc, &assoc_num); 1899 if (IS_ERR(tx_sa)) { 1900 rtnl_unlock(); 1901 return PTR_ERR(tx_sa); 1902 } 1903 1904 if (tx_sa->active) { 1905 rtnl_unlock(); 1906 return -EBUSY; 1907 } 1908 1909 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 1910 clear_tx_sa(tx_sa); 1911 1912 rtnl_unlock(); 1913 1914 return 0; 1915 } 1916 1917 static bool validate_upd_sa(struct nlattr **attrs) 1918 { 1919 if (!attrs[MACSEC_SA_ATTR_AN] || 1920 attrs[MACSEC_SA_ATTR_KEY] || 1921 attrs[MACSEC_SA_ATTR_KEYID]) 1922 return false; 1923 1924 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1925 return false; 1926 1927 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1928 return false; 1929 1930 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1931 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1932 return false; 1933 } 1934 1935 return true; 1936 } 1937 1938 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 1939 { 1940 struct nlattr **attrs = info->attrs; 1941 struct net_device *dev; 1942 struct macsec_secy *secy; 1943 struct macsec_tx_sc *tx_sc; 1944 struct macsec_tx_sa *tx_sa; 1945 u8 assoc_num; 1946 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1947 1948 if (!attrs[MACSEC_ATTR_IFINDEX]) 1949 return -EINVAL; 1950 1951 if (parse_sa_config(attrs, tb_sa)) 1952 return -EINVAL; 1953 1954 if (!validate_upd_sa(tb_sa)) 1955 return -EINVAL; 1956 1957 rtnl_lock(); 1958 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 1959 &dev, &secy, &tx_sc, &assoc_num); 1960 if (IS_ERR(tx_sa)) { 1961 rtnl_unlock(); 1962 return PTR_ERR(tx_sa); 1963 } 1964 1965 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1966 spin_lock_bh(&tx_sa->lock); 1967 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1968 spin_unlock_bh(&tx_sa->lock); 1969 } 1970 1971 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1972 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1973 1974 if (assoc_num == tx_sc->encoding_sa) 1975 secy->operational = tx_sa->active; 1976 1977 rtnl_unlock(); 1978 1979 return 0; 1980 } 1981 1982 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 1983 { 1984 struct nlattr **attrs = info->attrs; 1985 struct net_device *dev; 1986 struct macsec_secy *secy; 1987 struct macsec_rx_sc *rx_sc; 1988 struct macsec_rx_sa *rx_sa; 1989 u8 assoc_num; 1990 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1991 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1992 1993 if (!attrs[MACSEC_ATTR_IFINDEX]) 1994 return -EINVAL; 1995 1996 if (parse_rxsc_config(attrs, tb_rxsc)) 1997 return -EINVAL; 1998 1999 if (parse_sa_config(attrs, tb_sa)) 2000 return -EINVAL; 2001 2002 if (!validate_upd_sa(tb_sa)) 2003 return -EINVAL; 2004 2005 rtnl_lock(); 2006 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2007 &dev, &secy, &rx_sc, &assoc_num); 2008 if (IS_ERR(rx_sa)) { 2009 rtnl_unlock(); 2010 return PTR_ERR(rx_sa); 2011 } 2012 2013 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2014 spin_lock_bh(&rx_sa->lock); 2015 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 2016 spin_unlock_bh(&rx_sa->lock); 2017 } 2018 2019 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2020 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2021 2022 rtnl_unlock(); 2023 return 0; 2024 } 2025 2026 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2027 { 2028 struct nlattr **attrs = info->attrs; 2029 struct net_device *dev; 2030 struct macsec_secy *secy; 2031 struct macsec_rx_sc *rx_sc; 2032 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2033 2034 if (!attrs[MACSEC_ATTR_IFINDEX]) 2035 return -EINVAL; 2036 2037 if (parse_rxsc_config(attrs, tb_rxsc)) 2038 return -EINVAL; 2039 2040 if (!validate_add_rxsc(tb_rxsc)) 2041 return -EINVAL; 2042 2043 rtnl_lock(); 2044 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2045 if (IS_ERR(rx_sc)) { 2046 rtnl_unlock(); 2047 return PTR_ERR(rx_sc); 2048 } 2049 2050 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2051 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2052 2053 if (rx_sc->active != new) 2054 secy->n_rx_sc += new ? 1 : -1; 2055 2056 rx_sc->active = new; 2057 } 2058 2059 rtnl_unlock(); 2060 2061 return 0; 2062 } 2063 2064 static int copy_tx_sa_stats(struct sk_buff *skb, 2065 struct macsec_tx_sa_stats __percpu *pstats) 2066 { 2067 struct macsec_tx_sa_stats sum = {0, }; 2068 int cpu; 2069 2070 for_each_possible_cpu(cpu) { 2071 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2072 2073 sum.OutPktsProtected += stats->OutPktsProtected; 2074 sum.OutPktsEncrypted += stats->OutPktsEncrypted; 2075 } 2076 2077 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) || 2078 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted)) 2079 return -EMSGSIZE; 2080 2081 return 0; 2082 } 2083 2084 static int copy_rx_sa_stats(struct sk_buff *skb, 2085 struct macsec_rx_sa_stats __percpu *pstats) 2086 { 2087 struct macsec_rx_sa_stats sum = {0, }; 2088 int cpu; 2089 2090 for_each_possible_cpu(cpu) { 2091 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2092 2093 sum.InPktsOK += stats->InPktsOK; 2094 sum.InPktsInvalid += stats->InPktsInvalid; 2095 sum.InPktsNotValid += stats->InPktsNotValid; 2096 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA; 2097 sum.InPktsUnusedSA += stats->InPktsUnusedSA; 2098 } 2099 2100 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) || 2101 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) || 2102 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) || 2103 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) || 2104 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA)) 2105 return -EMSGSIZE; 2106 2107 return 0; 2108 } 2109 2110 static int copy_rx_sc_stats(struct sk_buff *skb, 2111 struct pcpu_rx_sc_stats __percpu *pstats) 2112 { 2113 struct macsec_rx_sc_stats sum = {0, }; 2114 int cpu; 2115 2116 for_each_possible_cpu(cpu) { 2117 const struct pcpu_rx_sc_stats *stats; 2118 struct macsec_rx_sc_stats tmp; 2119 unsigned int start; 2120 2121 stats = per_cpu_ptr(pstats, cpu); 2122 do { 2123 start = u64_stats_fetch_begin_irq(&stats->syncp); 2124 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2125 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2126 2127 sum.InOctetsValidated += tmp.InOctetsValidated; 2128 sum.InOctetsDecrypted += tmp.InOctetsDecrypted; 2129 sum.InPktsUnchecked += tmp.InPktsUnchecked; 2130 sum.InPktsDelayed += tmp.InPktsDelayed; 2131 sum.InPktsOK += tmp.InPktsOK; 2132 sum.InPktsInvalid += tmp.InPktsInvalid; 2133 sum.InPktsLate += tmp.InPktsLate; 2134 sum.InPktsNotValid += tmp.InPktsNotValid; 2135 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2136 sum.InPktsUnusedSA += tmp.InPktsUnusedSA; 2137 } 2138 2139 if (nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, sum.InOctetsValidated) || 2140 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, sum.InOctetsDecrypted) || 2141 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, sum.InPktsUnchecked) || 2142 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, sum.InPktsDelayed) || 2143 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) || 2144 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) || 2145 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, sum.InPktsLate) || 2146 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) || 2147 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) || 2148 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA)) 2149 return -EMSGSIZE; 2150 2151 return 0; 2152 } 2153 2154 static int copy_tx_sc_stats(struct sk_buff *skb, 2155 struct pcpu_tx_sc_stats __percpu *pstats) 2156 { 2157 struct macsec_tx_sc_stats sum = {0, }; 2158 int cpu; 2159 2160 for_each_possible_cpu(cpu) { 2161 const struct pcpu_tx_sc_stats *stats; 2162 struct macsec_tx_sc_stats tmp; 2163 unsigned int start; 2164 2165 stats = per_cpu_ptr(pstats, cpu); 2166 do { 2167 start = u64_stats_fetch_begin_irq(&stats->syncp); 2168 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2169 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2170 2171 sum.OutPktsProtected += tmp.OutPktsProtected; 2172 sum.OutPktsEncrypted += tmp.OutPktsEncrypted; 2173 sum.OutOctetsProtected += tmp.OutOctetsProtected; 2174 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2175 } 2176 2177 if (nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) || 2178 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted) || 2179 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, sum.OutOctetsProtected) || 2180 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, sum.OutOctetsEncrypted)) 2181 return -EMSGSIZE; 2182 2183 return 0; 2184 } 2185 2186 static int copy_secy_stats(struct sk_buff *skb, 2187 struct pcpu_secy_stats __percpu *pstats) 2188 { 2189 struct macsec_dev_stats sum = {0, }; 2190 int cpu; 2191 2192 for_each_possible_cpu(cpu) { 2193 const struct pcpu_secy_stats *stats; 2194 struct macsec_dev_stats tmp; 2195 unsigned int start; 2196 2197 stats = per_cpu_ptr(pstats, cpu); 2198 do { 2199 start = u64_stats_fetch_begin_irq(&stats->syncp); 2200 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2201 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2202 2203 sum.OutPktsUntagged += tmp.OutPktsUntagged; 2204 sum.InPktsUntagged += tmp.InPktsUntagged; 2205 sum.OutPktsTooLong += tmp.OutPktsTooLong; 2206 sum.InPktsNoTag += tmp.InPktsNoTag; 2207 sum.InPktsBadTag += tmp.InPktsBadTag; 2208 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2209 sum.InPktsNoSCI += tmp.InPktsNoSCI; 2210 sum.InPktsOverrun += tmp.InPktsOverrun; 2211 } 2212 2213 if (nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, sum.OutPktsUntagged) || 2214 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, sum.InPktsUntagged) || 2215 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, sum.OutPktsTooLong) || 2216 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, sum.InPktsNoTag) || 2217 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, sum.InPktsBadTag) || 2218 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, sum.InPktsUnknownSCI) || 2219 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, sum.InPktsNoSCI) || 2220 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, sum.InPktsOverrun)) 2221 return -EMSGSIZE; 2222 2223 return 0; 2224 } 2225 2226 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 2227 { 2228 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2229 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY); 2230 2231 if (!secy_nest) 2232 return 1; 2233 2234 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci) || 2235 nla_put_u64(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 2236 MACSEC_DEFAULT_CIPHER_ID) || 2237 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 2238 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 2239 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 2240 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 2241 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 2242 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 2243 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 2244 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 2245 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 2246 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 2247 goto cancel; 2248 2249 if (secy->replay_protect) { 2250 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 2251 goto cancel; 2252 } 2253 2254 nla_nest_end(skb, secy_nest); 2255 return 0; 2256 2257 cancel: 2258 nla_nest_cancel(skb, secy_nest); 2259 return 1; 2260 } 2261 2262 static int dump_secy(struct macsec_secy *secy, struct net_device *dev, 2263 struct sk_buff *skb, struct netlink_callback *cb) 2264 { 2265 struct macsec_rx_sc *rx_sc; 2266 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2267 struct nlattr *txsa_list, *rxsc_list; 2268 int i, j; 2269 void *hdr; 2270 struct nlattr *attr; 2271 2272 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 2273 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 2274 if (!hdr) 2275 return -EMSGSIZE; 2276 2277 genl_dump_check_consistent(cb, hdr, &macsec_fam); 2278 2279 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 2280 goto nla_put_failure; 2281 2282 if (nla_put_secy(secy, skb)) 2283 goto nla_put_failure; 2284 2285 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS); 2286 if (!attr) 2287 goto nla_put_failure; 2288 if (copy_tx_sc_stats(skb, tx_sc->stats)) { 2289 nla_nest_cancel(skb, attr); 2290 goto nla_put_failure; 2291 } 2292 nla_nest_end(skb, attr); 2293 2294 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS); 2295 if (!attr) 2296 goto nla_put_failure; 2297 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) { 2298 nla_nest_cancel(skb, attr); 2299 goto nla_put_failure; 2300 } 2301 nla_nest_end(skb, attr); 2302 2303 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST); 2304 if (!txsa_list) 2305 goto nla_put_failure; 2306 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 2307 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 2308 struct nlattr *txsa_nest; 2309 2310 if (!tx_sa) 2311 continue; 2312 2313 txsa_nest = nla_nest_start(skb, j++); 2314 if (!txsa_nest) { 2315 nla_nest_cancel(skb, txsa_list); 2316 goto nla_put_failure; 2317 } 2318 2319 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2320 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) || 2321 nla_put_u64(skb, MACSEC_SA_ATTR_KEYID, tx_sa->key.id) || 2322 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 2323 nla_nest_cancel(skb, txsa_nest); 2324 nla_nest_cancel(skb, txsa_list); 2325 goto nla_put_failure; 2326 } 2327 2328 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS); 2329 if (!attr) { 2330 nla_nest_cancel(skb, txsa_nest); 2331 nla_nest_cancel(skb, txsa_list); 2332 goto nla_put_failure; 2333 } 2334 if (copy_tx_sa_stats(skb, tx_sa->stats)) { 2335 nla_nest_cancel(skb, attr); 2336 nla_nest_cancel(skb, txsa_nest); 2337 nla_nest_cancel(skb, txsa_list); 2338 goto nla_put_failure; 2339 } 2340 nla_nest_end(skb, attr); 2341 2342 nla_nest_end(skb, txsa_nest); 2343 } 2344 nla_nest_end(skb, txsa_list); 2345 2346 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST); 2347 if (!rxsc_list) 2348 goto nla_put_failure; 2349 2350 j = 1; 2351 for_each_rxsc_rtnl(secy, rx_sc) { 2352 int k; 2353 struct nlattr *rxsa_list; 2354 struct nlattr *rxsc_nest = nla_nest_start(skb, j++); 2355 2356 if (!rxsc_nest) { 2357 nla_nest_cancel(skb, rxsc_list); 2358 goto nla_put_failure; 2359 } 2360 2361 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 2362 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci)) { 2363 nla_nest_cancel(skb, rxsc_nest); 2364 nla_nest_cancel(skb, rxsc_list); 2365 goto nla_put_failure; 2366 } 2367 2368 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS); 2369 if (!attr) { 2370 nla_nest_cancel(skb, rxsc_nest); 2371 nla_nest_cancel(skb, rxsc_list); 2372 goto nla_put_failure; 2373 } 2374 if (copy_rx_sc_stats(skb, rx_sc->stats)) { 2375 nla_nest_cancel(skb, attr); 2376 nla_nest_cancel(skb, rxsc_nest); 2377 nla_nest_cancel(skb, rxsc_list); 2378 goto nla_put_failure; 2379 } 2380 nla_nest_end(skb, attr); 2381 2382 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST); 2383 if (!rxsa_list) { 2384 nla_nest_cancel(skb, rxsc_nest); 2385 nla_nest_cancel(skb, rxsc_list); 2386 goto nla_put_failure; 2387 } 2388 2389 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 2390 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 2391 struct nlattr *rxsa_nest; 2392 2393 if (!rx_sa) 2394 continue; 2395 2396 rxsa_nest = nla_nest_start(skb, k++); 2397 if (!rxsa_nest) { 2398 nla_nest_cancel(skb, rxsa_list); 2399 nla_nest_cancel(skb, rxsc_nest); 2400 nla_nest_cancel(skb, rxsc_list); 2401 goto nla_put_failure; 2402 } 2403 2404 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS); 2405 if (!attr) { 2406 nla_nest_cancel(skb, rxsa_list); 2407 nla_nest_cancel(skb, rxsc_nest); 2408 nla_nest_cancel(skb, rxsc_list); 2409 goto nla_put_failure; 2410 } 2411 if (copy_rx_sa_stats(skb, rx_sa->stats)) { 2412 nla_nest_cancel(skb, attr); 2413 nla_nest_cancel(skb, rxsa_list); 2414 nla_nest_cancel(skb, rxsc_nest); 2415 nla_nest_cancel(skb, rxsc_list); 2416 goto nla_put_failure; 2417 } 2418 nla_nest_end(skb, attr); 2419 2420 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2421 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) || 2422 nla_put_u64(skb, MACSEC_SA_ATTR_KEYID, rx_sa->key.id) || 2423 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 2424 nla_nest_cancel(skb, rxsa_nest); 2425 nla_nest_cancel(skb, rxsc_nest); 2426 nla_nest_cancel(skb, rxsc_list); 2427 goto nla_put_failure; 2428 } 2429 nla_nest_end(skb, rxsa_nest); 2430 } 2431 2432 nla_nest_end(skb, rxsa_list); 2433 nla_nest_end(skb, rxsc_nest); 2434 } 2435 2436 nla_nest_end(skb, rxsc_list); 2437 2438 genlmsg_end(skb, hdr); 2439 2440 return 0; 2441 2442 nla_put_failure: 2443 genlmsg_cancel(skb, hdr); 2444 return -EMSGSIZE; 2445 } 2446 2447 static int macsec_generation = 1; /* protected by RTNL */ 2448 2449 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 2450 { 2451 struct net *net = sock_net(skb->sk); 2452 struct net_device *dev; 2453 int dev_idx, d; 2454 2455 dev_idx = cb->args[0]; 2456 2457 d = 0; 2458 rtnl_lock(); 2459 2460 cb->seq = macsec_generation; 2461 2462 for_each_netdev(net, dev) { 2463 struct macsec_secy *secy; 2464 2465 if (d < dev_idx) 2466 goto next; 2467 2468 if (!netif_is_macsec(dev)) 2469 goto next; 2470 2471 secy = &macsec_priv(dev)->secy; 2472 if (dump_secy(secy, dev, skb, cb) < 0) 2473 goto done; 2474 next: 2475 d++; 2476 } 2477 2478 done: 2479 rtnl_unlock(); 2480 cb->args[0] = d; 2481 return skb->len; 2482 } 2483 2484 static const struct genl_ops macsec_genl_ops[] = { 2485 { 2486 .cmd = MACSEC_CMD_GET_TXSC, 2487 .dumpit = macsec_dump_txsc, 2488 .policy = macsec_genl_policy, 2489 }, 2490 { 2491 .cmd = MACSEC_CMD_ADD_RXSC, 2492 .doit = macsec_add_rxsc, 2493 .policy = macsec_genl_policy, 2494 .flags = GENL_ADMIN_PERM, 2495 }, 2496 { 2497 .cmd = MACSEC_CMD_DEL_RXSC, 2498 .doit = macsec_del_rxsc, 2499 .policy = macsec_genl_policy, 2500 .flags = GENL_ADMIN_PERM, 2501 }, 2502 { 2503 .cmd = MACSEC_CMD_UPD_RXSC, 2504 .doit = macsec_upd_rxsc, 2505 .policy = macsec_genl_policy, 2506 .flags = GENL_ADMIN_PERM, 2507 }, 2508 { 2509 .cmd = MACSEC_CMD_ADD_TXSA, 2510 .doit = macsec_add_txsa, 2511 .policy = macsec_genl_policy, 2512 .flags = GENL_ADMIN_PERM, 2513 }, 2514 { 2515 .cmd = MACSEC_CMD_DEL_TXSA, 2516 .doit = macsec_del_txsa, 2517 .policy = macsec_genl_policy, 2518 .flags = GENL_ADMIN_PERM, 2519 }, 2520 { 2521 .cmd = MACSEC_CMD_UPD_TXSA, 2522 .doit = macsec_upd_txsa, 2523 .policy = macsec_genl_policy, 2524 .flags = GENL_ADMIN_PERM, 2525 }, 2526 { 2527 .cmd = MACSEC_CMD_ADD_RXSA, 2528 .doit = macsec_add_rxsa, 2529 .policy = macsec_genl_policy, 2530 .flags = GENL_ADMIN_PERM, 2531 }, 2532 { 2533 .cmd = MACSEC_CMD_DEL_RXSA, 2534 .doit = macsec_del_rxsa, 2535 .policy = macsec_genl_policy, 2536 .flags = GENL_ADMIN_PERM, 2537 }, 2538 { 2539 .cmd = MACSEC_CMD_UPD_RXSA, 2540 .doit = macsec_upd_rxsa, 2541 .policy = macsec_genl_policy, 2542 .flags = GENL_ADMIN_PERM, 2543 }, 2544 }; 2545 2546 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 2547 struct net_device *dev) 2548 { 2549 struct macsec_dev *macsec = netdev_priv(dev); 2550 struct macsec_secy *secy = &macsec->secy; 2551 struct pcpu_secy_stats *secy_stats; 2552 int ret, len; 2553 2554 /* 10.5 */ 2555 if (!secy->protect_frames) { 2556 secy_stats = this_cpu_ptr(macsec->stats); 2557 u64_stats_update_begin(&secy_stats->syncp); 2558 secy_stats->stats.OutPktsUntagged++; 2559 u64_stats_update_end(&secy_stats->syncp); 2560 len = skb->len; 2561 ret = dev_queue_xmit(skb); 2562 count_tx(dev, ret, len); 2563 return ret; 2564 } 2565 2566 if (!secy->operational) { 2567 kfree_skb(skb); 2568 dev->stats.tx_dropped++; 2569 return NETDEV_TX_OK; 2570 } 2571 2572 skb = macsec_encrypt(skb, dev); 2573 if (IS_ERR(skb)) { 2574 if (PTR_ERR(skb) != -EINPROGRESS) 2575 dev->stats.tx_dropped++; 2576 return NETDEV_TX_OK; 2577 } 2578 2579 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 2580 2581 macsec_encrypt_finish(skb, dev); 2582 len = skb->len; 2583 ret = dev_queue_xmit(skb); 2584 count_tx(dev, ret, len); 2585 return ret; 2586 } 2587 2588 #define MACSEC_FEATURES \ 2589 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 2590 static int macsec_dev_init(struct net_device *dev) 2591 { 2592 struct macsec_dev *macsec = macsec_priv(dev); 2593 struct net_device *real_dev = macsec->real_dev; 2594 2595 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2596 if (!dev->tstats) 2597 return -ENOMEM; 2598 2599 dev->features = real_dev->features & MACSEC_FEATURES; 2600 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 2601 2602 dev->needed_headroom = real_dev->needed_headroom + 2603 MACSEC_NEEDED_HEADROOM; 2604 dev->needed_tailroom = real_dev->needed_tailroom + 2605 MACSEC_NEEDED_TAILROOM; 2606 2607 if (is_zero_ether_addr(dev->dev_addr)) 2608 eth_hw_addr_inherit(dev, real_dev); 2609 if (is_zero_ether_addr(dev->broadcast)) 2610 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 2611 2612 return 0; 2613 } 2614 2615 static void macsec_dev_uninit(struct net_device *dev) 2616 { 2617 free_percpu(dev->tstats); 2618 } 2619 2620 static netdev_features_t macsec_fix_features(struct net_device *dev, 2621 netdev_features_t features) 2622 { 2623 struct macsec_dev *macsec = macsec_priv(dev); 2624 struct net_device *real_dev = macsec->real_dev; 2625 2626 features &= real_dev->features & MACSEC_FEATURES; 2627 features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 2628 2629 return features; 2630 } 2631 2632 static int macsec_dev_open(struct net_device *dev) 2633 { 2634 struct macsec_dev *macsec = macsec_priv(dev); 2635 struct net_device *real_dev = macsec->real_dev; 2636 int err; 2637 2638 if (!(real_dev->flags & IFF_UP)) 2639 return -ENETDOWN; 2640 2641 err = dev_uc_add(real_dev, dev->dev_addr); 2642 if (err < 0) 2643 return err; 2644 2645 if (dev->flags & IFF_ALLMULTI) { 2646 err = dev_set_allmulti(real_dev, 1); 2647 if (err < 0) 2648 goto del_unicast; 2649 } 2650 2651 if (dev->flags & IFF_PROMISC) { 2652 err = dev_set_promiscuity(real_dev, 1); 2653 if (err < 0) 2654 goto clear_allmulti; 2655 } 2656 2657 if (netif_carrier_ok(real_dev)) 2658 netif_carrier_on(dev); 2659 2660 return 0; 2661 clear_allmulti: 2662 if (dev->flags & IFF_ALLMULTI) 2663 dev_set_allmulti(real_dev, -1); 2664 del_unicast: 2665 dev_uc_del(real_dev, dev->dev_addr); 2666 netif_carrier_off(dev); 2667 return err; 2668 } 2669 2670 static int macsec_dev_stop(struct net_device *dev) 2671 { 2672 struct macsec_dev *macsec = macsec_priv(dev); 2673 struct net_device *real_dev = macsec->real_dev; 2674 2675 netif_carrier_off(dev); 2676 2677 dev_mc_unsync(real_dev, dev); 2678 dev_uc_unsync(real_dev, dev); 2679 2680 if (dev->flags & IFF_ALLMULTI) 2681 dev_set_allmulti(real_dev, -1); 2682 2683 if (dev->flags & IFF_PROMISC) 2684 dev_set_promiscuity(real_dev, -1); 2685 2686 dev_uc_del(real_dev, dev->dev_addr); 2687 2688 return 0; 2689 } 2690 2691 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 2692 { 2693 struct net_device *real_dev = macsec_priv(dev)->real_dev; 2694 2695 if (!(dev->flags & IFF_UP)) 2696 return; 2697 2698 if (change & IFF_ALLMULTI) 2699 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 2700 2701 if (change & IFF_PROMISC) 2702 dev_set_promiscuity(real_dev, 2703 dev->flags & IFF_PROMISC ? 1 : -1); 2704 } 2705 2706 static void macsec_dev_set_rx_mode(struct net_device *dev) 2707 { 2708 struct net_device *real_dev = macsec_priv(dev)->real_dev; 2709 2710 dev_mc_sync(real_dev, dev); 2711 dev_uc_sync(real_dev, dev); 2712 } 2713 2714 static int macsec_set_mac_address(struct net_device *dev, void *p) 2715 { 2716 struct macsec_dev *macsec = macsec_priv(dev); 2717 struct net_device *real_dev = macsec->real_dev; 2718 struct sockaddr *addr = p; 2719 int err; 2720 2721 if (!is_valid_ether_addr(addr->sa_data)) 2722 return -EADDRNOTAVAIL; 2723 2724 if (!(dev->flags & IFF_UP)) 2725 goto out; 2726 2727 err = dev_uc_add(real_dev, addr->sa_data); 2728 if (err < 0) 2729 return err; 2730 2731 dev_uc_del(real_dev, dev->dev_addr); 2732 2733 out: 2734 ether_addr_copy(dev->dev_addr, addr->sa_data); 2735 return 0; 2736 } 2737 2738 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 2739 { 2740 struct macsec_dev *macsec = macsec_priv(dev); 2741 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 2742 2743 if (macsec->real_dev->mtu - extra < new_mtu) 2744 return -ERANGE; 2745 2746 dev->mtu = new_mtu; 2747 2748 return 0; 2749 } 2750 2751 static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev, 2752 struct rtnl_link_stats64 *s) 2753 { 2754 int cpu; 2755 2756 if (!dev->tstats) 2757 return s; 2758 2759 for_each_possible_cpu(cpu) { 2760 struct pcpu_sw_netstats *stats; 2761 struct pcpu_sw_netstats tmp; 2762 int start; 2763 2764 stats = per_cpu_ptr(dev->tstats, cpu); 2765 do { 2766 start = u64_stats_fetch_begin_irq(&stats->syncp); 2767 tmp.rx_packets = stats->rx_packets; 2768 tmp.rx_bytes = stats->rx_bytes; 2769 tmp.tx_packets = stats->tx_packets; 2770 tmp.tx_bytes = stats->tx_bytes; 2771 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2772 2773 s->rx_packets += tmp.rx_packets; 2774 s->rx_bytes += tmp.rx_bytes; 2775 s->tx_packets += tmp.tx_packets; 2776 s->tx_bytes += tmp.tx_bytes; 2777 } 2778 2779 s->rx_dropped = dev->stats.rx_dropped; 2780 s->tx_dropped = dev->stats.tx_dropped; 2781 2782 return s; 2783 } 2784 2785 static int macsec_get_iflink(const struct net_device *dev) 2786 { 2787 return macsec_priv(dev)->real_dev->ifindex; 2788 } 2789 2790 static const struct net_device_ops macsec_netdev_ops = { 2791 .ndo_init = macsec_dev_init, 2792 .ndo_uninit = macsec_dev_uninit, 2793 .ndo_open = macsec_dev_open, 2794 .ndo_stop = macsec_dev_stop, 2795 .ndo_fix_features = macsec_fix_features, 2796 .ndo_change_mtu = macsec_change_mtu, 2797 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 2798 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 2799 .ndo_set_mac_address = macsec_set_mac_address, 2800 .ndo_start_xmit = macsec_start_xmit, 2801 .ndo_get_stats64 = macsec_get_stats64, 2802 .ndo_get_iflink = macsec_get_iflink, 2803 }; 2804 2805 static const struct device_type macsec_type = { 2806 .name = "macsec", 2807 }; 2808 2809 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 2810 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 2811 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 2812 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 2813 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 2814 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 2815 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 2816 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 2817 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 2818 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 2819 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 2820 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 2821 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 2822 }; 2823 2824 static void macsec_free_netdev(struct net_device *dev) 2825 { 2826 struct macsec_dev *macsec = macsec_priv(dev); 2827 struct net_device *real_dev = macsec->real_dev; 2828 2829 free_percpu(macsec->stats); 2830 free_percpu(macsec->secy.tx_sc.stats); 2831 2832 dev_put(real_dev); 2833 free_netdev(dev); 2834 } 2835 2836 static void macsec_setup(struct net_device *dev) 2837 { 2838 ether_setup(dev); 2839 dev->tx_queue_len = 0; 2840 dev->netdev_ops = &macsec_netdev_ops; 2841 dev->destructor = macsec_free_netdev; 2842 2843 eth_zero_addr(dev->broadcast); 2844 } 2845 2846 static void macsec_changelink_common(struct net_device *dev, 2847 struct nlattr *data[]) 2848 { 2849 struct macsec_secy *secy; 2850 struct macsec_tx_sc *tx_sc; 2851 2852 secy = &macsec_priv(dev)->secy; 2853 tx_sc = &secy->tx_sc; 2854 2855 if (data[IFLA_MACSEC_ENCODING_SA]) { 2856 struct macsec_tx_sa *tx_sa; 2857 2858 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 2859 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 2860 2861 secy->operational = tx_sa && tx_sa->active; 2862 } 2863 2864 if (data[IFLA_MACSEC_WINDOW]) 2865 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 2866 2867 if (data[IFLA_MACSEC_ENCRYPT]) 2868 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 2869 2870 if (data[IFLA_MACSEC_PROTECT]) 2871 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 2872 2873 if (data[IFLA_MACSEC_INC_SCI]) 2874 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 2875 2876 if (data[IFLA_MACSEC_ES]) 2877 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 2878 2879 if (data[IFLA_MACSEC_SCB]) 2880 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 2881 2882 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 2883 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 2884 2885 if (data[IFLA_MACSEC_VALIDATION]) 2886 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 2887 } 2888 2889 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 2890 struct nlattr *data[]) 2891 { 2892 if (!data) 2893 return 0; 2894 2895 if (data[IFLA_MACSEC_CIPHER_SUITE] || 2896 data[IFLA_MACSEC_ICV_LEN] || 2897 data[IFLA_MACSEC_SCI] || 2898 data[IFLA_MACSEC_PORT]) 2899 return -EINVAL; 2900 2901 macsec_changelink_common(dev, data); 2902 2903 return 0; 2904 } 2905 2906 static void macsec_del_dev(struct macsec_dev *macsec) 2907 { 2908 int i; 2909 2910 while (macsec->secy.rx_sc) { 2911 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 2912 2913 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 2914 free_rx_sc(rx_sc); 2915 } 2916 2917 for (i = 0; i < MACSEC_NUM_AN; i++) { 2918 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 2919 2920 if (sa) { 2921 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 2922 clear_tx_sa(sa); 2923 } 2924 } 2925 } 2926 2927 static void macsec_dellink(struct net_device *dev, struct list_head *head) 2928 { 2929 struct macsec_dev *macsec = macsec_priv(dev); 2930 struct net_device *real_dev = macsec->real_dev; 2931 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 2932 2933 macsec_generation++; 2934 2935 unregister_netdevice_queue(dev, head); 2936 list_del_rcu(&macsec->secys); 2937 if (list_empty(&rxd->secys)) { 2938 netdev_rx_handler_unregister(real_dev); 2939 kfree(rxd); 2940 } 2941 2942 macsec_del_dev(macsec); 2943 } 2944 2945 static int register_macsec_dev(struct net_device *real_dev, 2946 struct net_device *dev) 2947 { 2948 struct macsec_dev *macsec = macsec_priv(dev); 2949 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 2950 2951 if (!rxd) { 2952 int err; 2953 2954 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 2955 if (!rxd) 2956 return -ENOMEM; 2957 2958 INIT_LIST_HEAD(&rxd->secys); 2959 2960 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 2961 rxd); 2962 if (err < 0) { 2963 kfree(rxd); 2964 return err; 2965 } 2966 } 2967 2968 list_add_tail_rcu(&macsec->secys, &rxd->secys); 2969 return 0; 2970 } 2971 2972 static bool sci_exists(struct net_device *dev, sci_t sci) 2973 { 2974 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 2975 struct macsec_dev *macsec; 2976 2977 list_for_each_entry(macsec, &rxd->secys, secys) { 2978 if (macsec->secy.sci == sci) 2979 return true; 2980 } 2981 2982 return false; 2983 } 2984 2985 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 2986 { 2987 return make_sci(dev->dev_addr, port); 2988 } 2989 2990 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 2991 { 2992 struct macsec_dev *macsec = macsec_priv(dev); 2993 struct macsec_secy *secy = &macsec->secy; 2994 2995 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 2996 if (!macsec->stats) 2997 return -ENOMEM; 2998 2999 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 3000 if (!secy->tx_sc.stats) { 3001 free_percpu(macsec->stats); 3002 return -ENOMEM; 3003 } 3004 3005 if (sci == MACSEC_UNDEF_SCI) 3006 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3007 3008 secy->netdev = dev; 3009 secy->operational = true; 3010 secy->key_len = DEFAULT_SAK_LEN; 3011 secy->icv_len = icv_len; 3012 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 3013 secy->protect_frames = true; 3014 secy->replay_protect = false; 3015 3016 secy->sci = sci; 3017 secy->tx_sc.active = true; 3018 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 3019 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 3020 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 3021 secy->tx_sc.end_station = false; 3022 secy->tx_sc.scb = false; 3023 3024 return 0; 3025 } 3026 3027 static int macsec_newlink(struct net *net, struct net_device *dev, 3028 struct nlattr *tb[], struct nlattr *data[]) 3029 { 3030 struct macsec_dev *macsec = macsec_priv(dev); 3031 struct net_device *real_dev; 3032 int err; 3033 sci_t sci; 3034 u8 icv_len = DEFAULT_ICV_LEN; 3035 rx_handler_func_t *rx_handler; 3036 3037 if (!tb[IFLA_LINK]) 3038 return -EINVAL; 3039 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 3040 if (!real_dev) 3041 return -ENODEV; 3042 3043 dev->priv_flags |= IFF_MACSEC; 3044 3045 macsec->real_dev = real_dev; 3046 3047 if (data && data[IFLA_MACSEC_ICV_LEN]) 3048 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3049 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 3050 3051 rx_handler = rtnl_dereference(real_dev->rx_handler); 3052 if (rx_handler && rx_handler != macsec_handle_frame) 3053 return -EBUSY; 3054 3055 err = register_netdevice(dev); 3056 if (err < 0) 3057 return err; 3058 3059 /* need to be already registered so that ->init has run and 3060 * the MAC addr is set 3061 */ 3062 if (data && data[IFLA_MACSEC_SCI]) 3063 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 3064 else if (data && data[IFLA_MACSEC_PORT]) 3065 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 3066 else 3067 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3068 3069 if (rx_handler && sci_exists(real_dev, sci)) { 3070 err = -EBUSY; 3071 goto unregister; 3072 } 3073 3074 err = macsec_add_dev(dev, sci, icv_len); 3075 if (err) 3076 goto unregister; 3077 3078 if (data) 3079 macsec_changelink_common(dev, data); 3080 3081 err = register_macsec_dev(real_dev, dev); 3082 if (err < 0) 3083 goto del_dev; 3084 3085 macsec_generation++; 3086 3087 dev_hold(real_dev); 3088 3089 return 0; 3090 3091 del_dev: 3092 macsec_del_dev(macsec); 3093 unregister: 3094 unregister_netdevice(dev); 3095 return err; 3096 } 3097 3098 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[]) 3099 { 3100 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 3101 u8 icv_len = DEFAULT_ICV_LEN; 3102 int flag; 3103 bool es, scb, sci; 3104 3105 if (!data) 3106 return 0; 3107 3108 if (data[IFLA_MACSEC_CIPHER_SUITE]) 3109 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 3110 3111 if (data[IFLA_MACSEC_ICV_LEN]) 3112 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3113 3114 switch (csid) { 3115 case MACSEC_DEFAULT_CIPHER_ID: 3116 case MACSEC_DEFAULT_CIPHER_ALT: 3117 if (icv_len < MACSEC_MIN_ICV_LEN || 3118 icv_len > MACSEC_MAX_ICV_LEN) 3119 return -EINVAL; 3120 break; 3121 default: 3122 return -EINVAL; 3123 } 3124 3125 if (data[IFLA_MACSEC_ENCODING_SA]) { 3126 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 3127 return -EINVAL; 3128 } 3129 3130 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 3131 flag < IFLA_MACSEC_VALIDATION; 3132 flag++) { 3133 if (data[flag]) { 3134 if (nla_get_u8(data[flag]) > 1) 3135 return -EINVAL; 3136 } 3137 } 3138 3139 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 3140 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 3141 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 3142 3143 if ((sci && (scb || es)) || (scb && es)) 3144 return -EINVAL; 3145 3146 if (data[IFLA_MACSEC_VALIDATION] && 3147 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 3148 return -EINVAL; 3149 3150 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 3151 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 3152 !data[IFLA_MACSEC_WINDOW]) 3153 return -EINVAL; 3154 3155 return 0; 3156 } 3157 3158 static struct net *macsec_get_link_net(const struct net_device *dev) 3159 { 3160 return dev_net(macsec_priv(dev)->real_dev); 3161 } 3162 3163 static size_t macsec_get_size(const struct net_device *dev) 3164 { 3165 return 0 + 3166 nla_total_size(8) + /* SCI */ 3167 nla_total_size(1) + /* ICV_LEN */ 3168 nla_total_size(8) + /* CIPHER_SUITE */ 3169 nla_total_size(4) + /* WINDOW */ 3170 nla_total_size(1) + /* ENCODING_SA */ 3171 nla_total_size(1) + /* ENCRYPT */ 3172 nla_total_size(1) + /* PROTECT */ 3173 nla_total_size(1) + /* INC_SCI */ 3174 nla_total_size(1) + /* ES */ 3175 nla_total_size(1) + /* SCB */ 3176 nla_total_size(1) + /* REPLAY_PROTECT */ 3177 nla_total_size(1) + /* VALIDATION */ 3178 0; 3179 } 3180 3181 static int macsec_fill_info(struct sk_buff *skb, 3182 const struct net_device *dev) 3183 { 3184 struct macsec_secy *secy = &macsec_priv(dev)->secy; 3185 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3186 3187 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci) || 3188 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 3189 nla_put_u64(skb, IFLA_MACSEC_CIPHER_SUITE, 3190 MACSEC_DEFAULT_CIPHER_ID) || 3191 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 3192 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 3193 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 3194 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 3195 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 3196 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 3197 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 3198 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 3199 0) 3200 goto nla_put_failure; 3201 3202 if (secy->replay_protect) { 3203 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 3204 goto nla_put_failure; 3205 } 3206 3207 return 0; 3208 3209 nla_put_failure: 3210 return -EMSGSIZE; 3211 } 3212 3213 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 3214 .kind = "macsec", 3215 .priv_size = sizeof(struct macsec_dev), 3216 .maxtype = IFLA_MACSEC_MAX, 3217 .policy = macsec_rtnl_policy, 3218 .setup = macsec_setup, 3219 .validate = macsec_validate_attr, 3220 .newlink = macsec_newlink, 3221 .changelink = macsec_changelink, 3222 .dellink = macsec_dellink, 3223 .get_size = macsec_get_size, 3224 .fill_info = macsec_fill_info, 3225 .get_link_net = macsec_get_link_net, 3226 }; 3227 3228 static bool is_macsec_master(struct net_device *dev) 3229 { 3230 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 3231 } 3232 3233 static int macsec_notify(struct notifier_block *this, unsigned long event, 3234 void *ptr) 3235 { 3236 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 3237 LIST_HEAD(head); 3238 3239 if (!is_macsec_master(real_dev)) 3240 return NOTIFY_DONE; 3241 3242 switch (event) { 3243 case NETDEV_UNREGISTER: { 3244 struct macsec_dev *m, *n; 3245 struct macsec_rxh_data *rxd; 3246 3247 rxd = macsec_data_rtnl(real_dev); 3248 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 3249 macsec_dellink(m->secy.netdev, &head); 3250 } 3251 unregister_netdevice_many(&head); 3252 break; 3253 } 3254 case NETDEV_CHANGEMTU: { 3255 struct macsec_dev *m; 3256 struct macsec_rxh_data *rxd; 3257 3258 rxd = macsec_data_rtnl(real_dev); 3259 list_for_each_entry(m, &rxd->secys, secys) { 3260 struct net_device *dev = m->secy.netdev; 3261 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 3262 macsec_extra_len(true)); 3263 3264 if (dev->mtu > mtu) 3265 dev_set_mtu(dev, mtu); 3266 } 3267 } 3268 } 3269 3270 return NOTIFY_OK; 3271 } 3272 3273 static struct notifier_block macsec_notifier = { 3274 .notifier_call = macsec_notify, 3275 }; 3276 3277 static int __init macsec_init(void) 3278 { 3279 int err; 3280 3281 pr_info("MACsec IEEE 802.1AE\n"); 3282 err = register_netdevice_notifier(&macsec_notifier); 3283 if (err) 3284 return err; 3285 3286 err = rtnl_link_register(&macsec_link_ops); 3287 if (err) 3288 goto notifier; 3289 3290 err = genl_register_family_with_ops(&macsec_fam, macsec_genl_ops); 3291 if (err) 3292 goto rtnl; 3293 3294 return 0; 3295 3296 rtnl: 3297 rtnl_link_unregister(&macsec_link_ops); 3298 notifier: 3299 unregister_netdevice_notifier(&macsec_notifier); 3300 return err; 3301 } 3302 3303 static void __exit macsec_exit(void) 3304 { 3305 genl_unregister_family(&macsec_fam); 3306 rtnl_link_unregister(&macsec_link_ops); 3307 unregister_netdevice_notifier(&macsec_notifier); 3308 } 3309 3310 module_init(macsec_init); 3311 module_exit(macsec_exit); 3312 3313 MODULE_ALIAS_RTNL_LINK("macsec"); 3314 3315 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 3316 MODULE_LICENSE("GPL v2"); 3317