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 u8 id[MACSEC_KEYID_LEN]; 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_BINARY, 1533 .len = MACSEC_KEYID_LEN, }, 1534 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1535 .len = MACSEC_MAX_KEY_LEN, }, 1536 }; 1537 1538 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1539 { 1540 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1541 return -EINVAL; 1542 1543 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], 1544 macsec_genl_sa_policy)) 1545 return -EINVAL; 1546 1547 return 0; 1548 } 1549 1550 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1551 { 1552 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1553 return -EINVAL; 1554 1555 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], 1556 macsec_genl_rxsc_policy)) 1557 return -EINVAL; 1558 1559 return 0; 1560 } 1561 1562 static bool validate_add_rxsa(struct nlattr **attrs) 1563 { 1564 if (!attrs[MACSEC_SA_ATTR_AN] || 1565 !attrs[MACSEC_SA_ATTR_KEY] || 1566 !attrs[MACSEC_SA_ATTR_KEYID]) 1567 return false; 1568 1569 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1570 return false; 1571 1572 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1573 return false; 1574 1575 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1576 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1577 return false; 1578 } 1579 1580 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1581 return false; 1582 1583 return true; 1584 } 1585 1586 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1587 { 1588 struct net_device *dev; 1589 struct nlattr **attrs = info->attrs; 1590 struct macsec_secy *secy; 1591 struct macsec_rx_sc *rx_sc; 1592 struct macsec_rx_sa *rx_sa; 1593 unsigned char assoc_num; 1594 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1595 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1596 1597 if (!attrs[MACSEC_ATTR_IFINDEX]) 1598 return -EINVAL; 1599 1600 if (parse_sa_config(attrs, tb_sa)) 1601 return -EINVAL; 1602 1603 if (parse_rxsc_config(attrs, tb_rxsc)) 1604 return -EINVAL; 1605 1606 if (!validate_add_rxsa(tb_sa)) 1607 return -EINVAL; 1608 1609 rtnl_lock(); 1610 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1611 if (IS_ERR(rx_sc) || !macsec_rxsc_get(rx_sc)) { 1612 rtnl_unlock(); 1613 return PTR_ERR(rx_sc); 1614 } 1615 1616 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1617 1618 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1619 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1620 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1621 rtnl_unlock(); 1622 return -EINVAL; 1623 } 1624 1625 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1626 if (rx_sa) { 1627 rtnl_unlock(); 1628 return -EBUSY; 1629 } 1630 1631 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1632 if (!rx_sa || init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1633 secy->key_len, secy->icv_len)) { 1634 kfree(rx_sa); 1635 rtnl_unlock(); 1636 return -ENOMEM; 1637 } 1638 1639 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1640 spin_lock_bh(&rx_sa->lock); 1641 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1642 spin_unlock_bh(&rx_sa->lock); 1643 } 1644 1645 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1646 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1647 1648 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEY], MACSEC_KEYID_LEN); 1649 rx_sa->sc = rx_sc; 1650 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1651 1652 rtnl_unlock(); 1653 1654 return 0; 1655 } 1656 1657 static bool validate_add_rxsc(struct nlattr **attrs) 1658 { 1659 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1660 return false; 1661 1662 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1663 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1664 return false; 1665 } 1666 1667 return true; 1668 } 1669 1670 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1671 { 1672 struct net_device *dev; 1673 sci_t sci = MACSEC_UNDEF_SCI; 1674 struct nlattr **attrs = info->attrs; 1675 struct macsec_rx_sc *rx_sc; 1676 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1677 1678 if (!attrs[MACSEC_ATTR_IFINDEX]) 1679 return -EINVAL; 1680 1681 if (parse_rxsc_config(attrs, tb_rxsc)) 1682 return -EINVAL; 1683 1684 if (!validate_add_rxsc(tb_rxsc)) 1685 return -EINVAL; 1686 1687 rtnl_lock(); 1688 dev = get_dev_from_nl(genl_info_net(info), attrs); 1689 if (IS_ERR(dev)) { 1690 rtnl_unlock(); 1691 return PTR_ERR(dev); 1692 } 1693 1694 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1695 1696 rx_sc = create_rx_sc(dev, sci); 1697 if (IS_ERR(rx_sc)) { 1698 rtnl_unlock(); 1699 return PTR_ERR(rx_sc); 1700 } 1701 1702 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1703 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1704 1705 rtnl_unlock(); 1706 1707 return 0; 1708 } 1709 1710 static bool validate_add_txsa(struct nlattr **attrs) 1711 { 1712 if (!attrs[MACSEC_SA_ATTR_AN] || 1713 !attrs[MACSEC_SA_ATTR_PN] || 1714 !attrs[MACSEC_SA_ATTR_KEY] || 1715 !attrs[MACSEC_SA_ATTR_KEYID]) 1716 return false; 1717 1718 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1719 return false; 1720 1721 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1722 return false; 1723 1724 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1725 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1726 return false; 1727 } 1728 1729 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1730 return false; 1731 1732 return true; 1733 } 1734 1735 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1736 { 1737 struct net_device *dev; 1738 struct nlattr **attrs = info->attrs; 1739 struct macsec_secy *secy; 1740 struct macsec_tx_sc *tx_sc; 1741 struct macsec_tx_sa *tx_sa; 1742 unsigned char assoc_num; 1743 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1744 1745 if (!attrs[MACSEC_ATTR_IFINDEX]) 1746 return -EINVAL; 1747 1748 if (parse_sa_config(attrs, tb_sa)) 1749 return -EINVAL; 1750 1751 if (!validate_add_txsa(tb_sa)) 1752 return -EINVAL; 1753 1754 rtnl_lock(); 1755 dev = get_dev_from_nl(genl_info_net(info), attrs); 1756 if (IS_ERR(dev)) { 1757 rtnl_unlock(); 1758 return PTR_ERR(dev); 1759 } 1760 1761 secy = &macsec_priv(dev)->secy; 1762 tx_sc = &secy->tx_sc; 1763 1764 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1765 1766 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1767 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 1768 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1769 rtnl_unlock(); 1770 return -EINVAL; 1771 } 1772 1773 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 1774 if (tx_sa) { 1775 rtnl_unlock(); 1776 return -EBUSY; 1777 } 1778 1779 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 1780 if (!tx_sa || init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1781 secy->key_len, secy->icv_len)) { 1782 kfree(tx_sa); 1783 rtnl_unlock(); 1784 return -ENOMEM; 1785 } 1786 1787 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEY], MACSEC_KEYID_LEN); 1788 1789 spin_lock_bh(&tx_sa->lock); 1790 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1791 spin_unlock_bh(&tx_sa->lock); 1792 1793 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1794 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1795 1796 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 1797 secy->operational = true; 1798 1799 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 1800 1801 rtnl_unlock(); 1802 1803 return 0; 1804 } 1805 1806 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 1807 { 1808 struct nlattr **attrs = info->attrs; 1809 struct net_device *dev; 1810 struct macsec_secy *secy; 1811 struct macsec_rx_sc *rx_sc; 1812 struct macsec_rx_sa *rx_sa; 1813 u8 assoc_num; 1814 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1815 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1816 1817 if (!attrs[MACSEC_ATTR_IFINDEX]) 1818 return -EINVAL; 1819 1820 if (parse_sa_config(attrs, tb_sa)) 1821 return -EINVAL; 1822 1823 if (parse_rxsc_config(attrs, tb_rxsc)) 1824 return -EINVAL; 1825 1826 rtnl_lock(); 1827 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 1828 &dev, &secy, &rx_sc, &assoc_num); 1829 if (IS_ERR(rx_sa)) { 1830 rtnl_unlock(); 1831 return PTR_ERR(rx_sa); 1832 } 1833 1834 if (rx_sa->active) { 1835 rtnl_unlock(); 1836 return -EBUSY; 1837 } 1838 1839 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 1840 clear_rx_sa(rx_sa); 1841 1842 rtnl_unlock(); 1843 1844 return 0; 1845 } 1846 1847 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 1848 { 1849 struct nlattr **attrs = info->attrs; 1850 struct net_device *dev; 1851 struct macsec_secy *secy; 1852 struct macsec_rx_sc *rx_sc; 1853 sci_t sci; 1854 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1855 1856 if (!attrs[MACSEC_ATTR_IFINDEX]) 1857 return -EINVAL; 1858 1859 if (parse_rxsc_config(attrs, tb_rxsc)) 1860 return -EINVAL; 1861 1862 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1863 return -EINVAL; 1864 1865 rtnl_lock(); 1866 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 1867 if (IS_ERR(dev)) { 1868 rtnl_unlock(); 1869 return PTR_ERR(dev); 1870 } 1871 1872 secy = &macsec_priv(dev)->secy; 1873 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1874 1875 rx_sc = del_rx_sc(secy, sci); 1876 if (!rx_sc) { 1877 rtnl_unlock(); 1878 return -ENODEV; 1879 } 1880 1881 free_rx_sc(rx_sc); 1882 rtnl_unlock(); 1883 1884 return 0; 1885 } 1886 1887 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 1888 { 1889 struct nlattr **attrs = info->attrs; 1890 struct net_device *dev; 1891 struct macsec_secy *secy; 1892 struct macsec_tx_sc *tx_sc; 1893 struct macsec_tx_sa *tx_sa; 1894 u8 assoc_num; 1895 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1896 1897 if (!attrs[MACSEC_ATTR_IFINDEX]) 1898 return -EINVAL; 1899 1900 if (parse_sa_config(attrs, tb_sa)) 1901 return -EINVAL; 1902 1903 rtnl_lock(); 1904 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 1905 &dev, &secy, &tx_sc, &assoc_num); 1906 if (IS_ERR(tx_sa)) { 1907 rtnl_unlock(); 1908 return PTR_ERR(tx_sa); 1909 } 1910 1911 if (tx_sa->active) { 1912 rtnl_unlock(); 1913 return -EBUSY; 1914 } 1915 1916 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 1917 clear_tx_sa(tx_sa); 1918 1919 rtnl_unlock(); 1920 1921 return 0; 1922 } 1923 1924 static bool validate_upd_sa(struct nlattr **attrs) 1925 { 1926 if (!attrs[MACSEC_SA_ATTR_AN] || 1927 attrs[MACSEC_SA_ATTR_KEY] || 1928 attrs[MACSEC_SA_ATTR_KEYID]) 1929 return false; 1930 1931 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1932 return false; 1933 1934 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1935 return false; 1936 1937 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1938 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1939 return false; 1940 } 1941 1942 return true; 1943 } 1944 1945 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 1946 { 1947 struct nlattr **attrs = info->attrs; 1948 struct net_device *dev; 1949 struct macsec_secy *secy; 1950 struct macsec_tx_sc *tx_sc; 1951 struct macsec_tx_sa *tx_sa; 1952 u8 assoc_num; 1953 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1954 1955 if (!attrs[MACSEC_ATTR_IFINDEX]) 1956 return -EINVAL; 1957 1958 if (parse_sa_config(attrs, tb_sa)) 1959 return -EINVAL; 1960 1961 if (!validate_upd_sa(tb_sa)) 1962 return -EINVAL; 1963 1964 rtnl_lock(); 1965 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 1966 &dev, &secy, &tx_sc, &assoc_num); 1967 if (IS_ERR(tx_sa)) { 1968 rtnl_unlock(); 1969 return PTR_ERR(tx_sa); 1970 } 1971 1972 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1973 spin_lock_bh(&tx_sa->lock); 1974 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1975 spin_unlock_bh(&tx_sa->lock); 1976 } 1977 1978 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1979 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1980 1981 if (assoc_num == tx_sc->encoding_sa) 1982 secy->operational = tx_sa->active; 1983 1984 rtnl_unlock(); 1985 1986 return 0; 1987 } 1988 1989 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 1990 { 1991 struct nlattr **attrs = info->attrs; 1992 struct net_device *dev; 1993 struct macsec_secy *secy; 1994 struct macsec_rx_sc *rx_sc; 1995 struct macsec_rx_sa *rx_sa; 1996 u8 assoc_num; 1997 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1998 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1999 2000 if (!attrs[MACSEC_ATTR_IFINDEX]) 2001 return -EINVAL; 2002 2003 if (parse_rxsc_config(attrs, tb_rxsc)) 2004 return -EINVAL; 2005 2006 if (parse_sa_config(attrs, tb_sa)) 2007 return -EINVAL; 2008 2009 if (!validate_upd_sa(tb_sa)) 2010 return -EINVAL; 2011 2012 rtnl_lock(); 2013 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2014 &dev, &secy, &rx_sc, &assoc_num); 2015 if (IS_ERR(rx_sa)) { 2016 rtnl_unlock(); 2017 return PTR_ERR(rx_sa); 2018 } 2019 2020 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2021 spin_lock_bh(&rx_sa->lock); 2022 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 2023 spin_unlock_bh(&rx_sa->lock); 2024 } 2025 2026 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2027 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2028 2029 rtnl_unlock(); 2030 return 0; 2031 } 2032 2033 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2034 { 2035 struct nlattr **attrs = info->attrs; 2036 struct net_device *dev; 2037 struct macsec_secy *secy; 2038 struct macsec_rx_sc *rx_sc; 2039 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2040 2041 if (!attrs[MACSEC_ATTR_IFINDEX]) 2042 return -EINVAL; 2043 2044 if (parse_rxsc_config(attrs, tb_rxsc)) 2045 return -EINVAL; 2046 2047 if (!validate_add_rxsc(tb_rxsc)) 2048 return -EINVAL; 2049 2050 rtnl_lock(); 2051 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2052 if (IS_ERR(rx_sc)) { 2053 rtnl_unlock(); 2054 return PTR_ERR(rx_sc); 2055 } 2056 2057 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2058 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2059 2060 if (rx_sc->active != new) 2061 secy->n_rx_sc += new ? 1 : -1; 2062 2063 rx_sc->active = new; 2064 } 2065 2066 rtnl_unlock(); 2067 2068 return 0; 2069 } 2070 2071 static int copy_tx_sa_stats(struct sk_buff *skb, 2072 struct macsec_tx_sa_stats __percpu *pstats) 2073 { 2074 struct macsec_tx_sa_stats sum = {0, }; 2075 int cpu; 2076 2077 for_each_possible_cpu(cpu) { 2078 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2079 2080 sum.OutPktsProtected += stats->OutPktsProtected; 2081 sum.OutPktsEncrypted += stats->OutPktsEncrypted; 2082 } 2083 2084 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) || 2085 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted)) 2086 return -EMSGSIZE; 2087 2088 return 0; 2089 } 2090 2091 static int copy_rx_sa_stats(struct sk_buff *skb, 2092 struct macsec_rx_sa_stats __percpu *pstats) 2093 { 2094 struct macsec_rx_sa_stats sum = {0, }; 2095 int cpu; 2096 2097 for_each_possible_cpu(cpu) { 2098 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2099 2100 sum.InPktsOK += stats->InPktsOK; 2101 sum.InPktsInvalid += stats->InPktsInvalid; 2102 sum.InPktsNotValid += stats->InPktsNotValid; 2103 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA; 2104 sum.InPktsUnusedSA += stats->InPktsUnusedSA; 2105 } 2106 2107 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) || 2108 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) || 2109 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) || 2110 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) || 2111 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA)) 2112 return -EMSGSIZE; 2113 2114 return 0; 2115 } 2116 2117 static int copy_rx_sc_stats(struct sk_buff *skb, 2118 struct pcpu_rx_sc_stats __percpu *pstats) 2119 { 2120 struct macsec_rx_sc_stats sum = {0, }; 2121 int cpu; 2122 2123 for_each_possible_cpu(cpu) { 2124 const struct pcpu_rx_sc_stats *stats; 2125 struct macsec_rx_sc_stats tmp; 2126 unsigned int start; 2127 2128 stats = per_cpu_ptr(pstats, cpu); 2129 do { 2130 start = u64_stats_fetch_begin_irq(&stats->syncp); 2131 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2132 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2133 2134 sum.InOctetsValidated += tmp.InOctetsValidated; 2135 sum.InOctetsDecrypted += tmp.InOctetsDecrypted; 2136 sum.InPktsUnchecked += tmp.InPktsUnchecked; 2137 sum.InPktsDelayed += tmp.InPktsDelayed; 2138 sum.InPktsOK += tmp.InPktsOK; 2139 sum.InPktsInvalid += tmp.InPktsInvalid; 2140 sum.InPktsLate += tmp.InPktsLate; 2141 sum.InPktsNotValid += tmp.InPktsNotValid; 2142 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2143 sum.InPktsUnusedSA += tmp.InPktsUnusedSA; 2144 } 2145 2146 if (nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, sum.InOctetsValidated) || 2147 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, sum.InOctetsDecrypted) || 2148 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, sum.InPktsUnchecked) || 2149 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, sum.InPktsDelayed) || 2150 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) || 2151 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) || 2152 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, sum.InPktsLate) || 2153 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) || 2154 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) || 2155 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA)) 2156 return -EMSGSIZE; 2157 2158 return 0; 2159 } 2160 2161 static int copy_tx_sc_stats(struct sk_buff *skb, 2162 struct pcpu_tx_sc_stats __percpu *pstats) 2163 { 2164 struct macsec_tx_sc_stats sum = {0, }; 2165 int cpu; 2166 2167 for_each_possible_cpu(cpu) { 2168 const struct pcpu_tx_sc_stats *stats; 2169 struct macsec_tx_sc_stats tmp; 2170 unsigned int start; 2171 2172 stats = per_cpu_ptr(pstats, cpu); 2173 do { 2174 start = u64_stats_fetch_begin_irq(&stats->syncp); 2175 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2176 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2177 2178 sum.OutPktsProtected += tmp.OutPktsProtected; 2179 sum.OutPktsEncrypted += tmp.OutPktsEncrypted; 2180 sum.OutOctetsProtected += tmp.OutOctetsProtected; 2181 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2182 } 2183 2184 if (nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) || 2185 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted) || 2186 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, sum.OutOctetsProtected) || 2187 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, sum.OutOctetsEncrypted)) 2188 return -EMSGSIZE; 2189 2190 return 0; 2191 } 2192 2193 static int copy_secy_stats(struct sk_buff *skb, 2194 struct pcpu_secy_stats __percpu *pstats) 2195 { 2196 struct macsec_dev_stats sum = {0, }; 2197 int cpu; 2198 2199 for_each_possible_cpu(cpu) { 2200 const struct pcpu_secy_stats *stats; 2201 struct macsec_dev_stats tmp; 2202 unsigned int start; 2203 2204 stats = per_cpu_ptr(pstats, cpu); 2205 do { 2206 start = u64_stats_fetch_begin_irq(&stats->syncp); 2207 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2208 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2209 2210 sum.OutPktsUntagged += tmp.OutPktsUntagged; 2211 sum.InPktsUntagged += tmp.InPktsUntagged; 2212 sum.OutPktsTooLong += tmp.OutPktsTooLong; 2213 sum.InPktsNoTag += tmp.InPktsNoTag; 2214 sum.InPktsBadTag += tmp.InPktsBadTag; 2215 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2216 sum.InPktsNoSCI += tmp.InPktsNoSCI; 2217 sum.InPktsOverrun += tmp.InPktsOverrun; 2218 } 2219 2220 if (nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, sum.OutPktsUntagged) || 2221 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, sum.InPktsUntagged) || 2222 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, sum.OutPktsTooLong) || 2223 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, sum.InPktsNoTag) || 2224 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, sum.InPktsBadTag) || 2225 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, sum.InPktsUnknownSCI) || 2226 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, sum.InPktsNoSCI) || 2227 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, sum.InPktsOverrun)) 2228 return -EMSGSIZE; 2229 2230 return 0; 2231 } 2232 2233 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 2234 { 2235 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2236 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY); 2237 2238 if (!secy_nest) 2239 return 1; 2240 2241 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci) || 2242 nla_put_u64(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 2243 MACSEC_DEFAULT_CIPHER_ID) || 2244 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 2245 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 2246 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 2247 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 2248 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 2249 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 2250 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 2251 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 2252 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 2253 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 2254 goto cancel; 2255 2256 if (secy->replay_protect) { 2257 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 2258 goto cancel; 2259 } 2260 2261 nla_nest_end(skb, secy_nest); 2262 return 0; 2263 2264 cancel: 2265 nla_nest_cancel(skb, secy_nest); 2266 return 1; 2267 } 2268 2269 static int dump_secy(struct macsec_secy *secy, struct net_device *dev, 2270 struct sk_buff *skb, struct netlink_callback *cb) 2271 { 2272 struct macsec_rx_sc *rx_sc; 2273 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2274 struct nlattr *txsa_list, *rxsc_list; 2275 int i, j; 2276 void *hdr; 2277 struct nlattr *attr; 2278 2279 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 2280 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 2281 if (!hdr) 2282 return -EMSGSIZE; 2283 2284 genl_dump_check_consistent(cb, hdr, &macsec_fam); 2285 2286 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 2287 goto nla_put_failure; 2288 2289 if (nla_put_secy(secy, skb)) 2290 goto nla_put_failure; 2291 2292 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS); 2293 if (!attr) 2294 goto nla_put_failure; 2295 if (copy_tx_sc_stats(skb, tx_sc->stats)) { 2296 nla_nest_cancel(skb, attr); 2297 goto nla_put_failure; 2298 } 2299 nla_nest_end(skb, attr); 2300 2301 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS); 2302 if (!attr) 2303 goto nla_put_failure; 2304 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) { 2305 nla_nest_cancel(skb, attr); 2306 goto nla_put_failure; 2307 } 2308 nla_nest_end(skb, attr); 2309 2310 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST); 2311 if (!txsa_list) 2312 goto nla_put_failure; 2313 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 2314 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 2315 struct nlattr *txsa_nest; 2316 2317 if (!tx_sa) 2318 continue; 2319 2320 txsa_nest = nla_nest_start(skb, j++); 2321 if (!txsa_nest) { 2322 nla_nest_cancel(skb, txsa_list); 2323 goto nla_put_failure; 2324 } 2325 2326 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2327 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) || 2328 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 2329 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 2330 nla_nest_cancel(skb, txsa_nest); 2331 nla_nest_cancel(skb, txsa_list); 2332 goto nla_put_failure; 2333 } 2334 2335 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS); 2336 if (!attr) { 2337 nla_nest_cancel(skb, txsa_nest); 2338 nla_nest_cancel(skb, txsa_list); 2339 goto nla_put_failure; 2340 } 2341 if (copy_tx_sa_stats(skb, tx_sa->stats)) { 2342 nla_nest_cancel(skb, attr); 2343 nla_nest_cancel(skb, txsa_nest); 2344 nla_nest_cancel(skb, txsa_list); 2345 goto nla_put_failure; 2346 } 2347 nla_nest_end(skb, attr); 2348 2349 nla_nest_end(skb, txsa_nest); 2350 } 2351 nla_nest_end(skb, txsa_list); 2352 2353 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST); 2354 if (!rxsc_list) 2355 goto nla_put_failure; 2356 2357 j = 1; 2358 for_each_rxsc_rtnl(secy, rx_sc) { 2359 int k; 2360 struct nlattr *rxsa_list; 2361 struct nlattr *rxsc_nest = nla_nest_start(skb, j++); 2362 2363 if (!rxsc_nest) { 2364 nla_nest_cancel(skb, rxsc_list); 2365 goto nla_put_failure; 2366 } 2367 2368 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 2369 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci)) { 2370 nla_nest_cancel(skb, rxsc_nest); 2371 nla_nest_cancel(skb, rxsc_list); 2372 goto nla_put_failure; 2373 } 2374 2375 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS); 2376 if (!attr) { 2377 nla_nest_cancel(skb, rxsc_nest); 2378 nla_nest_cancel(skb, rxsc_list); 2379 goto nla_put_failure; 2380 } 2381 if (copy_rx_sc_stats(skb, rx_sc->stats)) { 2382 nla_nest_cancel(skb, attr); 2383 nla_nest_cancel(skb, rxsc_nest); 2384 nla_nest_cancel(skb, rxsc_list); 2385 goto nla_put_failure; 2386 } 2387 nla_nest_end(skb, attr); 2388 2389 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST); 2390 if (!rxsa_list) { 2391 nla_nest_cancel(skb, rxsc_nest); 2392 nla_nest_cancel(skb, rxsc_list); 2393 goto nla_put_failure; 2394 } 2395 2396 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 2397 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 2398 struct nlattr *rxsa_nest; 2399 2400 if (!rx_sa) 2401 continue; 2402 2403 rxsa_nest = nla_nest_start(skb, k++); 2404 if (!rxsa_nest) { 2405 nla_nest_cancel(skb, rxsa_list); 2406 nla_nest_cancel(skb, rxsc_nest); 2407 nla_nest_cancel(skb, rxsc_list); 2408 goto nla_put_failure; 2409 } 2410 2411 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS); 2412 if (!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 if (copy_rx_sa_stats(skb, rx_sa->stats)) { 2419 nla_nest_cancel(skb, attr); 2420 nla_nest_cancel(skb, rxsa_list); 2421 nla_nest_cancel(skb, rxsc_nest); 2422 nla_nest_cancel(skb, rxsc_list); 2423 goto nla_put_failure; 2424 } 2425 nla_nest_end(skb, attr); 2426 2427 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2428 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) || 2429 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 2430 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 2431 nla_nest_cancel(skb, rxsa_nest); 2432 nla_nest_cancel(skb, rxsc_nest); 2433 nla_nest_cancel(skb, rxsc_list); 2434 goto nla_put_failure; 2435 } 2436 nla_nest_end(skb, rxsa_nest); 2437 } 2438 2439 nla_nest_end(skb, rxsa_list); 2440 nla_nest_end(skb, rxsc_nest); 2441 } 2442 2443 nla_nest_end(skb, rxsc_list); 2444 2445 genlmsg_end(skb, hdr); 2446 2447 return 0; 2448 2449 nla_put_failure: 2450 genlmsg_cancel(skb, hdr); 2451 return -EMSGSIZE; 2452 } 2453 2454 static int macsec_generation = 1; /* protected by RTNL */ 2455 2456 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 2457 { 2458 struct net *net = sock_net(skb->sk); 2459 struct net_device *dev; 2460 int dev_idx, d; 2461 2462 dev_idx = cb->args[0]; 2463 2464 d = 0; 2465 rtnl_lock(); 2466 2467 cb->seq = macsec_generation; 2468 2469 for_each_netdev(net, dev) { 2470 struct macsec_secy *secy; 2471 2472 if (d < dev_idx) 2473 goto next; 2474 2475 if (!netif_is_macsec(dev)) 2476 goto next; 2477 2478 secy = &macsec_priv(dev)->secy; 2479 if (dump_secy(secy, dev, skb, cb) < 0) 2480 goto done; 2481 next: 2482 d++; 2483 } 2484 2485 done: 2486 rtnl_unlock(); 2487 cb->args[0] = d; 2488 return skb->len; 2489 } 2490 2491 static const struct genl_ops macsec_genl_ops[] = { 2492 { 2493 .cmd = MACSEC_CMD_GET_TXSC, 2494 .dumpit = macsec_dump_txsc, 2495 .policy = macsec_genl_policy, 2496 }, 2497 { 2498 .cmd = MACSEC_CMD_ADD_RXSC, 2499 .doit = macsec_add_rxsc, 2500 .policy = macsec_genl_policy, 2501 .flags = GENL_ADMIN_PERM, 2502 }, 2503 { 2504 .cmd = MACSEC_CMD_DEL_RXSC, 2505 .doit = macsec_del_rxsc, 2506 .policy = macsec_genl_policy, 2507 .flags = GENL_ADMIN_PERM, 2508 }, 2509 { 2510 .cmd = MACSEC_CMD_UPD_RXSC, 2511 .doit = macsec_upd_rxsc, 2512 .policy = macsec_genl_policy, 2513 .flags = GENL_ADMIN_PERM, 2514 }, 2515 { 2516 .cmd = MACSEC_CMD_ADD_TXSA, 2517 .doit = macsec_add_txsa, 2518 .policy = macsec_genl_policy, 2519 .flags = GENL_ADMIN_PERM, 2520 }, 2521 { 2522 .cmd = MACSEC_CMD_DEL_TXSA, 2523 .doit = macsec_del_txsa, 2524 .policy = macsec_genl_policy, 2525 .flags = GENL_ADMIN_PERM, 2526 }, 2527 { 2528 .cmd = MACSEC_CMD_UPD_TXSA, 2529 .doit = macsec_upd_txsa, 2530 .policy = macsec_genl_policy, 2531 .flags = GENL_ADMIN_PERM, 2532 }, 2533 { 2534 .cmd = MACSEC_CMD_ADD_RXSA, 2535 .doit = macsec_add_rxsa, 2536 .policy = macsec_genl_policy, 2537 .flags = GENL_ADMIN_PERM, 2538 }, 2539 { 2540 .cmd = MACSEC_CMD_DEL_RXSA, 2541 .doit = macsec_del_rxsa, 2542 .policy = macsec_genl_policy, 2543 .flags = GENL_ADMIN_PERM, 2544 }, 2545 { 2546 .cmd = MACSEC_CMD_UPD_RXSA, 2547 .doit = macsec_upd_rxsa, 2548 .policy = macsec_genl_policy, 2549 .flags = GENL_ADMIN_PERM, 2550 }, 2551 }; 2552 2553 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 2554 struct net_device *dev) 2555 { 2556 struct macsec_dev *macsec = netdev_priv(dev); 2557 struct macsec_secy *secy = &macsec->secy; 2558 struct pcpu_secy_stats *secy_stats; 2559 int ret, len; 2560 2561 /* 10.5 */ 2562 if (!secy->protect_frames) { 2563 secy_stats = this_cpu_ptr(macsec->stats); 2564 u64_stats_update_begin(&secy_stats->syncp); 2565 secy_stats->stats.OutPktsUntagged++; 2566 u64_stats_update_end(&secy_stats->syncp); 2567 len = skb->len; 2568 ret = dev_queue_xmit(skb); 2569 count_tx(dev, ret, len); 2570 return ret; 2571 } 2572 2573 if (!secy->operational) { 2574 kfree_skb(skb); 2575 dev->stats.tx_dropped++; 2576 return NETDEV_TX_OK; 2577 } 2578 2579 skb = macsec_encrypt(skb, dev); 2580 if (IS_ERR(skb)) { 2581 if (PTR_ERR(skb) != -EINPROGRESS) 2582 dev->stats.tx_dropped++; 2583 return NETDEV_TX_OK; 2584 } 2585 2586 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 2587 2588 macsec_encrypt_finish(skb, dev); 2589 len = skb->len; 2590 ret = dev_queue_xmit(skb); 2591 count_tx(dev, ret, len); 2592 return ret; 2593 } 2594 2595 #define MACSEC_FEATURES \ 2596 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 2597 static int macsec_dev_init(struct net_device *dev) 2598 { 2599 struct macsec_dev *macsec = macsec_priv(dev); 2600 struct net_device *real_dev = macsec->real_dev; 2601 2602 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2603 if (!dev->tstats) 2604 return -ENOMEM; 2605 2606 dev->features = real_dev->features & MACSEC_FEATURES; 2607 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 2608 2609 dev->needed_headroom = real_dev->needed_headroom + 2610 MACSEC_NEEDED_HEADROOM; 2611 dev->needed_tailroom = real_dev->needed_tailroom + 2612 MACSEC_NEEDED_TAILROOM; 2613 2614 if (is_zero_ether_addr(dev->dev_addr)) 2615 eth_hw_addr_inherit(dev, real_dev); 2616 if (is_zero_ether_addr(dev->broadcast)) 2617 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 2618 2619 return 0; 2620 } 2621 2622 static void macsec_dev_uninit(struct net_device *dev) 2623 { 2624 free_percpu(dev->tstats); 2625 } 2626 2627 static netdev_features_t macsec_fix_features(struct net_device *dev, 2628 netdev_features_t features) 2629 { 2630 struct macsec_dev *macsec = macsec_priv(dev); 2631 struct net_device *real_dev = macsec->real_dev; 2632 2633 features &= real_dev->features & MACSEC_FEATURES; 2634 features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 2635 2636 return features; 2637 } 2638 2639 static int macsec_dev_open(struct net_device *dev) 2640 { 2641 struct macsec_dev *macsec = macsec_priv(dev); 2642 struct net_device *real_dev = macsec->real_dev; 2643 int err; 2644 2645 if (!(real_dev->flags & IFF_UP)) 2646 return -ENETDOWN; 2647 2648 err = dev_uc_add(real_dev, dev->dev_addr); 2649 if (err < 0) 2650 return err; 2651 2652 if (dev->flags & IFF_ALLMULTI) { 2653 err = dev_set_allmulti(real_dev, 1); 2654 if (err < 0) 2655 goto del_unicast; 2656 } 2657 2658 if (dev->flags & IFF_PROMISC) { 2659 err = dev_set_promiscuity(real_dev, 1); 2660 if (err < 0) 2661 goto clear_allmulti; 2662 } 2663 2664 if (netif_carrier_ok(real_dev)) 2665 netif_carrier_on(dev); 2666 2667 return 0; 2668 clear_allmulti: 2669 if (dev->flags & IFF_ALLMULTI) 2670 dev_set_allmulti(real_dev, -1); 2671 del_unicast: 2672 dev_uc_del(real_dev, dev->dev_addr); 2673 netif_carrier_off(dev); 2674 return err; 2675 } 2676 2677 static int macsec_dev_stop(struct net_device *dev) 2678 { 2679 struct macsec_dev *macsec = macsec_priv(dev); 2680 struct net_device *real_dev = macsec->real_dev; 2681 2682 netif_carrier_off(dev); 2683 2684 dev_mc_unsync(real_dev, dev); 2685 dev_uc_unsync(real_dev, dev); 2686 2687 if (dev->flags & IFF_ALLMULTI) 2688 dev_set_allmulti(real_dev, -1); 2689 2690 if (dev->flags & IFF_PROMISC) 2691 dev_set_promiscuity(real_dev, -1); 2692 2693 dev_uc_del(real_dev, dev->dev_addr); 2694 2695 return 0; 2696 } 2697 2698 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 2699 { 2700 struct net_device *real_dev = macsec_priv(dev)->real_dev; 2701 2702 if (!(dev->flags & IFF_UP)) 2703 return; 2704 2705 if (change & IFF_ALLMULTI) 2706 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 2707 2708 if (change & IFF_PROMISC) 2709 dev_set_promiscuity(real_dev, 2710 dev->flags & IFF_PROMISC ? 1 : -1); 2711 } 2712 2713 static void macsec_dev_set_rx_mode(struct net_device *dev) 2714 { 2715 struct net_device *real_dev = macsec_priv(dev)->real_dev; 2716 2717 dev_mc_sync(real_dev, dev); 2718 dev_uc_sync(real_dev, dev); 2719 } 2720 2721 static int macsec_set_mac_address(struct net_device *dev, void *p) 2722 { 2723 struct macsec_dev *macsec = macsec_priv(dev); 2724 struct net_device *real_dev = macsec->real_dev; 2725 struct sockaddr *addr = p; 2726 int err; 2727 2728 if (!is_valid_ether_addr(addr->sa_data)) 2729 return -EADDRNOTAVAIL; 2730 2731 if (!(dev->flags & IFF_UP)) 2732 goto out; 2733 2734 err = dev_uc_add(real_dev, addr->sa_data); 2735 if (err < 0) 2736 return err; 2737 2738 dev_uc_del(real_dev, dev->dev_addr); 2739 2740 out: 2741 ether_addr_copy(dev->dev_addr, addr->sa_data); 2742 return 0; 2743 } 2744 2745 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 2746 { 2747 struct macsec_dev *macsec = macsec_priv(dev); 2748 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 2749 2750 if (macsec->real_dev->mtu - extra < new_mtu) 2751 return -ERANGE; 2752 2753 dev->mtu = new_mtu; 2754 2755 return 0; 2756 } 2757 2758 static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev, 2759 struct rtnl_link_stats64 *s) 2760 { 2761 int cpu; 2762 2763 if (!dev->tstats) 2764 return s; 2765 2766 for_each_possible_cpu(cpu) { 2767 struct pcpu_sw_netstats *stats; 2768 struct pcpu_sw_netstats tmp; 2769 int start; 2770 2771 stats = per_cpu_ptr(dev->tstats, cpu); 2772 do { 2773 start = u64_stats_fetch_begin_irq(&stats->syncp); 2774 tmp.rx_packets = stats->rx_packets; 2775 tmp.rx_bytes = stats->rx_bytes; 2776 tmp.tx_packets = stats->tx_packets; 2777 tmp.tx_bytes = stats->tx_bytes; 2778 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2779 2780 s->rx_packets += tmp.rx_packets; 2781 s->rx_bytes += tmp.rx_bytes; 2782 s->tx_packets += tmp.tx_packets; 2783 s->tx_bytes += tmp.tx_bytes; 2784 } 2785 2786 s->rx_dropped = dev->stats.rx_dropped; 2787 s->tx_dropped = dev->stats.tx_dropped; 2788 2789 return s; 2790 } 2791 2792 static int macsec_get_iflink(const struct net_device *dev) 2793 { 2794 return macsec_priv(dev)->real_dev->ifindex; 2795 } 2796 2797 static const struct net_device_ops macsec_netdev_ops = { 2798 .ndo_init = macsec_dev_init, 2799 .ndo_uninit = macsec_dev_uninit, 2800 .ndo_open = macsec_dev_open, 2801 .ndo_stop = macsec_dev_stop, 2802 .ndo_fix_features = macsec_fix_features, 2803 .ndo_change_mtu = macsec_change_mtu, 2804 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 2805 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 2806 .ndo_set_mac_address = macsec_set_mac_address, 2807 .ndo_start_xmit = macsec_start_xmit, 2808 .ndo_get_stats64 = macsec_get_stats64, 2809 .ndo_get_iflink = macsec_get_iflink, 2810 }; 2811 2812 static const struct device_type macsec_type = { 2813 .name = "macsec", 2814 }; 2815 2816 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 2817 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 2818 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 2819 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 2820 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 2821 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 2822 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 2823 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 2824 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 2825 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 2826 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 2827 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 2828 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 2829 }; 2830 2831 static void macsec_free_netdev(struct net_device *dev) 2832 { 2833 struct macsec_dev *macsec = macsec_priv(dev); 2834 struct net_device *real_dev = macsec->real_dev; 2835 2836 free_percpu(macsec->stats); 2837 free_percpu(macsec->secy.tx_sc.stats); 2838 2839 dev_put(real_dev); 2840 free_netdev(dev); 2841 } 2842 2843 static void macsec_setup(struct net_device *dev) 2844 { 2845 ether_setup(dev); 2846 dev->tx_queue_len = 0; 2847 dev->netdev_ops = &macsec_netdev_ops; 2848 dev->destructor = macsec_free_netdev; 2849 2850 eth_zero_addr(dev->broadcast); 2851 } 2852 2853 static void macsec_changelink_common(struct net_device *dev, 2854 struct nlattr *data[]) 2855 { 2856 struct macsec_secy *secy; 2857 struct macsec_tx_sc *tx_sc; 2858 2859 secy = &macsec_priv(dev)->secy; 2860 tx_sc = &secy->tx_sc; 2861 2862 if (data[IFLA_MACSEC_ENCODING_SA]) { 2863 struct macsec_tx_sa *tx_sa; 2864 2865 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 2866 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 2867 2868 secy->operational = tx_sa && tx_sa->active; 2869 } 2870 2871 if (data[IFLA_MACSEC_WINDOW]) 2872 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 2873 2874 if (data[IFLA_MACSEC_ENCRYPT]) 2875 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 2876 2877 if (data[IFLA_MACSEC_PROTECT]) 2878 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 2879 2880 if (data[IFLA_MACSEC_INC_SCI]) 2881 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 2882 2883 if (data[IFLA_MACSEC_ES]) 2884 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 2885 2886 if (data[IFLA_MACSEC_SCB]) 2887 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 2888 2889 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 2890 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 2891 2892 if (data[IFLA_MACSEC_VALIDATION]) 2893 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 2894 } 2895 2896 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 2897 struct nlattr *data[]) 2898 { 2899 if (!data) 2900 return 0; 2901 2902 if (data[IFLA_MACSEC_CIPHER_SUITE] || 2903 data[IFLA_MACSEC_ICV_LEN] || 2904 data[IFLA_MACSEC_SCI] || 2905 data[IFLA_MACSEC_PORT]) 2906 return -EINVAL; 2907 2908 macsec_changelink_common(dev, data); 2909 2910 return 0; 2911 } 2912 2913 static void macsec_del_dev(struct macsec_dev *macsec) 2914 { 2915 int i; 2916 2917 while (macsec->secy.rx_sc) { 2918 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 2919 2920 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 2921 free_rx_sc(rx_sc); 2922 } 2923 2924 for (i = 0; i < MACSEC_NUM_AN; i++) { 2925 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 2926 2927 if (sa) { 2928 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 2929 clear_tx_sa(sa); 2930 } 2931 } 2932 } 2933 2934 static void macsec_dellink(struct net_device *dev, struct list_head *head) 2935 { 2936 struct macsec_dev *macsec = macsec_priv(dev); 2937 struct net_device *real_dev = macsec->real_dev; 2938 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 2939 2940 macsec_generation++; 2941 2942 unregister_netdevice_queue(dev, head); 2943 list_del_rcu(&macsec->secys); 2944 if (list_empty(&rxd->secys)) { 2945 netdev_rx_handler_unregister(real_dev); 2946 kfree(rxd); 2947 } 2948 2949 macsec_del_dev(macsec); 2950 } 2951 2952 static int register_macsec_dev(struct net_device *real_dev, 2953 struct net_device *dev) 2954 { 2955 struct macsec_dev *macsec = macsec_priv(dev); 2956 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 2957 2958 if (!rxd) { 2959 int err; 2960 2961 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 2962 if (!rxd) 2963 return -ENOMEM; 2964 2965 INIT_LIST_HEAD(&rxd->secys); 2966 2967 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 2968 rxd); 2969 if (err < 0) { 2970 kfree(rxd); 2971 return err; 2972 } 2973 } 2974 2975 list_add_tail_rcu(&macsec->secys, &rxd->secys); 2976 return 0; 2977 } 2978 2979 static bool sci_exists(struct net_device *dev, sci_t sci) 2980 { 2981 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 2982 struct macsec_dev *macsec; 2983 2984 list_for_each_entry(macsec, &rxd->secys, secys) { 2985 if (macsec->secy.sci == sci) 2986 return true; 2987 } 2988 2989 return false; 2990 } 2991 2992 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 2993 { 2994 return make_sci(dev->dev_addr, port); 2995 } 2996 2997 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 2998 { 2999 struct macsec_dev *macsec = macsec_priv(dev); 3000 struct macsec_secy *secy = &macsec->secy; 3001 3002 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 3003 if (!macsec->stats) 3004 return -ENOMEM; 3005 3006 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 3007 if (!secy->tx_sc.stats) { 3008 free_percpu(macsec->stats); 3009 return -ENOMEM; 3010 } 3011 3012 if (sci == MACSEC_UNDEF_SCI) 3013 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3014 3015 secy->netdev = dev; 3016 secy->operational = true; 3017 secy->key_len = DEFAULT_SAK_LEN; 3018 secy->icv_len = icv_len; 3019 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 3020 secy->protect_frames = true; 3021 secy->replay_protect = false; 3022 3023 secy->sci = sci; 3024 secy->tx_sc.active = true; 3025 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 3026 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 3027 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 3028 secy->tx_sc.end_station = false; 3029 secy->tx_sc.scb = false; 3030 3031 return 0; 3032 } 3033 3034 static int macsec_newlink(struct net *net, struct net_device *dev, 3035 struct nlattr *tb[], struct nlattr *data[]) 3036 { 3037 struct macsec_dev *macsec = macsec_priv(dev); 3038 struct net_device *real_dev; 3039 int err; 3040 sci_t sci; 3041 u8 icv_len = DEFAULT_ICV_LEN; 3042 rx_handler_func_t *rx_handler; 3043 3044 if (!tb[IFLA_LINK]) 3045 return -EINVAL; 3046 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 3047 if (!real_dev) 3048 return -ENODEV; 3049 3050 dev->priv_flags |= IFF_MACSEC; 3051 3052 macsec->real_dev = real_dev; 3053 3054 if (data && data[IFLA_MACSEC_ICV_LEN]) 3055 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3056 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 3057 3058 rx_handler = rtnl_dereference(real_dev->rx_handler); 3059 if (rx_handler && rx_handler != macsec_handle_frame) 3060 return -EBUSY; 3061 3062 err = register_netdevice(dev); 3063 if (err < 0) 3064 return err; 3065 3066 /* need to be already registered so that ->init has run and 3067 * the MAC addr is set 3068 */ 3069 if (data && data[IFLA_MACSEC_SCI]) 3070 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 3071 else if (data && data[IFLA_MACSEC_PORT]) 3072 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 3073 else 3074 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3075 3076 if (rx_handler && sci_exists(real_dev, sci)) { 3077 err = -EBUSY; 3078 goto unregister; 3079 } 3080 3081 err = macsec_add_dev(dev, sci, icv_len); 3082 if (err) 3083 goto unregister; 3084 3085 if (data) 3086 macsec_changelink_common(dev, data); 3087 3088 err = register_macsec_dev(real_dev, dev); 3089 if (err < 0) 3090 goto del_dev; 3091 3092 macsec_generation++; 3093 3094 dev_hold(real_dev); 3095 3096 return 0; 3097 3098 del_dev: 3099 macsec_del_dev(macsec); 3100 unregister: 3101 unregister_netdevice(dev); 3102 return err; 3103 } 3104 3105 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[]) 3106 { 3107 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 3108 u8 icv_len = DEFAULT_ICV_LEN; 3109 int flag; 3110 bool es, scb, sci; 3111 3112 if (!data) 3113 return 0; 3114 3115 if (data[IFLA_MACSEC_CIPHER_SUITE]) 3116 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 3117 3118 if (data[IFLA_MACSEC_ICV_LEN]) 3119 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3120 3121 switch (csid) { 3122 case MACSEC_DEFAULT_CIPHER_ID: 3123 case MACSEC_DEFAULT_CIPHER_ALT: 3124 if (icv_len < MACSEC_MIN_ICV_LEN || 3125 icv_len > MACSEC_MAX_ICV_LEN) 3126 return -EINVAL; 3127 break; 3128 default: 3129 return -EINVAL; 3130 } 3131 3132 if (data[IFLA_MACSEC_ENCODING_SA]) { 3133 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 3134 return -EINVAL; 3135 } 3136 3137 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 3138 flag < IFLA_MACSEC_VALIDATION; 3139 flag++) { 3140 if (data[flag]) { 3141 if (nla_get_u8(data[flag]) > 1) 3142 return -EINVAL; 3143 } 3144 } 3145 3146 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 3147 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 3148 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 3149 3150 if ((sci && (scb || es)) || (scb && es)) 3151 return -EINVAL; 3152 3153 if (data[IFLA_MACSEC_VALIDATION] && 3154 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 3155 return -EINVAL; 3156 3157 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 3158 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 3159 !data[IFLA_MACSEC_WINDOW]) 3160 return -EINVAL; 3161 3162 return 0; 3163 } 3164 3165 static struct net *macsec_get_link_net(const struct net_device *dev) 3166 { 3167 return dev_net(macsec_priv(dev)->real_dev); 3168 } 3169 3170 static size_t macsec_get_size(const struct net_device *dev) 3171 { 3172 return 0 + 3173 nla_total_size(8) + /* SCI */ 3174 nla_total_size(1) + /* ICV_LEN */ 3175 nla_total_size(8) + /* CIPHER_SUITE */ 3176 nla_total_size(4) + /* WINDOW */ 3177 nla_total_size(1) + /* ENCODING_SA */ 3178 nla_total_size(1) + /* ENCRYPT */ 3179 nla_total_size(1) + /* PROTECT */ 3180 nla_total_size(1) + /* INC_SCI */ 3181 nla_total_size(1) + /* ES */ 3182 nla_total_size(1) + /* SCB */ 3183 nla_total_size(1) + /* REPLAY_PROTECT */ 3184 nla_total_size(1) + /* VALIDATION */ 3185 0; 3186 } 3187 3188 static int macsec_fill_info(struct sk_buff *skb, 3189 const struct net_device *dev) 3190 { 3191 struct macsec_secy *secy = &macsec_priv(dev)->secy; 3192 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3193 3194 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci) || 3195 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 3196 nla_put_u64(skb, IFLA_MACSEC_CIPHER_SUITE, 3197 MACSEC_DEFAULT_CIPHER_ID) || 3198 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 3199 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 3200 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 3201 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 3202 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 3203 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 3204 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 3205 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 3206 0) 3207 goto nla_put_failure; 3208 3209 if (secy->replay_protect) { 3210 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 3211 goto nla_put_failure; 3212 } 3213 3214 return 0; 3215 3216 nla_put_failure: 3217 return -EMSGSIZE; 3218 } 3219 3220 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 3221 .kind = "macsec", 3222 .priv_size = sizeof(struct macsec_dev), 3223 .maxtype = IFLA_MACSEC_MAX, 3224 .policy = macsec_rtnl_policy, 3225 .setup = macsec_setup, 3226 .validate = macsec_validate_attr, 3227 .newlink = macsec_newlink, 3228 .changelink = macsec_changelink, 3229 .dellink = macsec_dellink, 3230 .get_size = macsec_get_size, 3231 .fill_info = macsec_fill_info, 3232 .get_link_net = macsec_get_link_net, 3233 }; 3234 3235 static bool is_macsec_master(struct net_device *dev) 3236 { 3237 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 3238 } 3239 3240 static int macsec_notify(struct notifier_block *this, unsigned long event, 3241 void *ptr) 3242 { 3243 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 3244 LIST_HEAD(head); 3245 3246 if (!is_macsec_master(real_dev)) 3247 return NOTIFY_DONE; 3248 3249 switch (event) { 3250 case NETDEV_UNREGISTER: { 3251 struct macsec_dev *m, *n; 3252 struct macsec_rxh_data *rxd; 3253 3254 rxd = macsec_data_rtnl(real_dev); 3255 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 3256 macsec_dellink(m->secy.netdev, &head); 3257 } 3258 unregister_netdevice_many(&head); 3259 break; 3260 } 3261 case NETDEV_CHANGEMTU: { 3262 struct macsec_dev *m; 3263 struct macsec_rxh_data *rxd; 3264 3265 rxd = macsec_data_rtnl(real_dev); 3266 list_for_each_entry(m, &rxd->secys, secys) { 3267 struct net_device *dev = m->secy.netdev; 3268 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 3269 macsec_extra_len(true)); 3270 3271 if (dev->mtu > mtu) 3272 dev_set_mtu(dev, mtu); 3273 } 3274 } 3275 } 3276 3277 return NOTIFY_OK; 3278 } 3279 3280 static struct notifier_block macsec_notifier = { 3281 .notifier_call = macsec_notify, 3282 }; 3283 3284 static int __init macsec_init(void) 3285 { 3286 int err; 3287 3288 pr_info("MACsec IEEE 802.1AE\n"); 3289 err = register_netdevice_notifier(&macsec_notifier); 3290 if (err) 3291 return err; 3292 3293 err = rtnl_link_register(&macsec_link_ops); 3294 if (err) 3295 goto notifier; 3296 3297 err = genl_register_family_with_ops(&macsec_fam, macsec_genl_ops); 3298 if (err) 3299 goto rtnl; 3300 3301 return 0; 3302 3303 rtnl: 3304 rtnl_link_unregister(&macsec_link_ops); 3305 notifier: 3306 unregister_netdevice_notifier(&macsec_notifier); 3307 return err; 3308 } 3309 3310 static void __exit macsec_exit(void) 3311 { 3312 genl_unregister_family(&macsec_fam); 3313 rtnl_link_unregister(&macsec_link_ops); 3314 unregister_netdevice_notifier(&macsec_notifier); 3315 } 3316 3317 module_init(macsec_init); 3318 module_exit(macsec_exit); 3319 3320 MODULE_ALIAS_RTNL_LINK("macsec"); 3321 3322 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 3323 MODULE_LICENSE("GPL v2"); 3324