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 #include <net/gro_cells.h> 22 23 #include <uapi/linux/if_macsec.h> 24 25 typedef u64 __bitwise sci_t; 26 27 #define MACSEC_SCI_LEN 8 28 29 /* SecTAG length = macsec_eth_header without the optional SCI */ 30 #define MACSEC_TAG_LEN 6 31 32 struct macsec_eth_header { 33 struct ethhdr eth; 34 /* SecTAG */ 35 u8 tci_an; 36 #if defined(__LITTLE_ENDIAN_BITFIELD) 37 u8 short_length:6, 38 unused:2; 39 #elif defined(__BIG_ENDIAN_BITFIELD) 40 u8 unused:2, 41 short_length:6; 42 #else 43 #error "Please fix <asm/byteorder.h>" 44 #endif 45 __be32 packet_number; 46 u8 secure_channel_id[8]; /* optional */ 47 } __packed; 48 49 #define MACSEC_TCI_VERSION 0x80 50 #define MACSEC_TCI_ES 0x40 /* end station */ 51 #define MACSEC_TCI_SC 0x20 /* SCI present */ 52 #define MACSEC_TCI_SCB 0x10 /* epon */ 53 #define MACSEC_TCI_E 0x08 /* encryption */ 54 #define MACSEC_TCI_C 0x04 /* changed text */ 55 #define MACSEC_AN_MASK 0x03 /* association number */ 56 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C) 57 58 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */ 59 #define MIN_NON_SHORT_LEN 48 60 61 #define GCM_AES_IV_LEN 12 62 #define DEFAULT_ICV_LEN 16 63 64 #define MACSEC_NUM_AN 4 /* 2 bits for the association number */ 65 66 #define for_each_rxsc(secy, sc) \ 67 for (sc = rcu_dereference_bh(secy->rx_sc); \ 68 sc; \ 69 sc = rcu_dereference_bh(sc->next)) 70 #define for_each_rxsc_rtnl(secy, sc) \ 71 for (sc = rtnl_dereference(secy->rx_sc); \ 72 sc; \ 73 sc = rtnl_dereference(sc->next)) 74 75 struct gcm_iv { 76 union { 77 u8 secure_channel_id[8]; 78 sci_t sci; 79 }; 80 __be32 pn; 81 }; 82 83 /** 84 * struct macsec_key - SA key 85 * @id: user-provided key identifier 86 * @tfm: crypto struct, key storage 87 */ 88 struct macsec_key { 89 u8 id[MACSEC_KEYID_LEN]; 90 struct crypto_aead *tfm; 91 }; 92 93 struct macsec_rx_sc_stats { 94 __u64 InOctetsValidated; 95 __u64 InOctetsDecrypted; 96 __u64 InPktsUnchecked; 97 __u64 InPktsDelayed; 98 __u64 InPktsOK; 99 __u64 InPktsInvalid; 100 __u64 InPktsLate; 101 __u64 InPktsNotValid; 102 __u64 InPktsNotUsingSA; 103 __u64 InPktsUnusedSA; 104 }; 105 106 struct macsec_rx_sa_stats { 107 __u32 InPktsOK; 108 __u32 InPktsInvalid; 109 __u32 InPktsNotValid; 110 __u32 InPktsNotUsingSA; 111 __u32 InPktsUnusedSA; 112 }; 113 114 struct macsec_tx_sa_stats { 115 __u32 OutPktsProtected; 116 __u32 OutPktsEncrypted; 117 }; 118 119 struct macsec_tx_sc_stats { 120 __u64 OutPktsProtected; 121 __u64 OutPktsEncrypted; 122 __u64 OutOctetsProtected; 123 __u64 OutOctetsEncrypted; 124 }; 125 126 struct macsec_dev_stats { 127 __u64 OutPktsUntagged; 128 __u64 InPktsUntagged; 129 __u64 OutPktsTooLong; 130 __u64 InPktsNoTag; 131 __u64 InPktsBadTag; 132 __u64 InPktsUnknownSCI; 133 __u64 InPktsNoSCI; 134 __u64 InPktsOverrun; 135 }; 136 137 /** 138 * struct macsec_rx_sa - receive secure association 139 * @active: 140 * @next_pn: packet number expected for the next packet 141 * @lock: protects next_pn manipulations 142 * @key: key structure 143 * @stats: per-SA stats 144 */ 145 struct macsec_rx_sa { 146 struct macsec_key key; 147 spinlock_t lock; 148 u32 next_pn; 149 atomic_t refcnt; 150 bool active; 151 struct macsec_rx_sa_stats __percpu *stats; 152 struct macsec_rx_sc *sc; 153 struct rcu_head rcu; 154 }; 155 156 struct pcpu_rx_sc_stats { 157 struct macsec_rx_sc_stats stats; 158 struct u64_stats_sync syncp; 159 }; 160 161 /** 162 * struct macsec_rx_sc - receive secure channel 163 * @sci: secure channel identifier for this SC 164 * @active: channel is active 165 * @sa: array of secure associations 166 * @stats: per-SC stats 167 */ 168 struct macsec_rx_sc { 169 struct macsec_rx_sc __rcu *next; 170 sci_t sci; 171 bool active; 172 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN]; 173 struct pcpu_rx_sc_stats __percpu *stats; 174 atomic_t refcnt; 175 struct rcu_head rcu_head; 176 }; 177 178 /** 179 * struct macsec_tx_sa - transmit secure association 180 * @active: 181 * @next_pn: packet number to use for the next packet 182 * @lock: protects next_pn manipulations 183 * @key: key structure 184 * @stats: per-SA stats 185 */ 186 struct macsec_tx_sa { 187 struct macsec_key key; 188 spinlock_t lock; 189 u32 next_pn; 190 atomic_t refcnt; 191 bool active; 192 struct macsec_tx_sa_stats __percpu *stats; 193 struct rcu_head rcu; 194 }; 195 196 struct pcpu_tx_sc_stats { 197 struct macsec_tx_sc_stats stats; 198 struct u64_stats_sync syncp; 199 }; 200 201 /** 202 * struct macsec_tx_sc - transmit secure channel 203 * @active: 204 * @encoding_sa: association number of the SA currently in use 205 * @encrypt: encrypt packets on transmit, or authenticate only 206 * @send_sci: always include the SCI in the SecTAG 207 * @end_station: 208 * @scb: single copy broadcast flag 209 * @sa: array of secure associations 210 * @stats: stats for this TXSC 211 */ 212 struct macsec_tx_sc { 213 bool active; 214 u8 encoding_sa; 215 bool encrypt; 216 bool send_sci; 217 bool end_station; 218 bool scb; 219 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN]; 220 struct pcpu_tx_sc_stats __percpu *stats; 221 }; 222 223 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT 224 225 /** 226 * struct macsec_secy - MACsec Security Entity 227 * @netdev: netdevice for this SecY 228 * @n_rx_sc: number of receive secure channels configured on this SecY 229 * @sci: secure channel identifier used for tx 230 * @key_len: length of keys used by the cipher suite 231 * @icv_len: length of ICV used by the cipher suite 232 * @validate_frames: validation mode 233 * @operational: MAC_Operational flag 234 * @protect_frames: enable protection for this SecY 235 * @replay_protect: enable packet number checks on receive 236 * @replay_window: size of the replay window 237 * @tx_sc: transmit secure channel 238 * @rx_sc: linked list of receive secure channels 239 */ 240 struct macsec_secy { 241 struct net_device *netdev; 242 unsigned int n_rx_sc; 243 sci_t sci; 244 u16 key_len; 245 u16 icv_len; 246 enum macsec_validation_type validate_frames; 247 bool operational; 248 bool protect_frames; 249 bool replay_protect; 250 u32 replay_window; 251 struct macsec_tx_sc tx_sc; 252 struct macsec_rx_sc __rcu *rx_sc; 253 }; 254 255 struct pcpu_secy_stats { 256 struct macsec_dev_stats stats; 257 struct u64_stats_sync syncp; 258 }; 259 260 /** 261 * struct macsec_dev - private data 262 * @secy: SecY config 263 * @real_dev: pointer to underlying netdevice 264 * @stats: MACsec device stats 265 * @secys: linked list of SecY's on the underlying device 266 */ 267 struct macsec_dev { 268 struct macsec_secy secy; 269 struct net_device *real_dev; 270 struct pcpu_secy_stats __percpu *stats; 271 struct list_head secys; 272 struct gro_cells gro_cells; 273 unsigned int nest_level; 274 }; 275 276 /** 277 * struct macsec_rxh_data - rx_handler private argument 278 * @secys: linked list of SecY's on this underlying device 279 */ 280 struct macsec_rxh_data { 281 struct list_head secys; 282 }; 283 284 static struct macsec_dev *macsec_priv(const struct net_device *dev) 285 { 286 return (struct macsec_dev *)netdev_priv(dev); 287 } 288 289 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev) 290 { 291 return rcu_dereference_bh(dev->rx_handler_data); 292 } 293 294 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev) 295 { 296 return rtnl_dereference(dev->rx_handler_data); 297 } 298 299 struct macsec_cb { 300 struct aead_request *req; 301 union { 302 struct macsec_tx_sa *tx_sa; 303 struct macsec_rx_sa *rx_sa; 304 }; 305 u8 assoc_num; 306 bool valid; 307 bool has_sci; 308 }; 309 310 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr) 311 { 312 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr); 313 314 if (!sa || !sa->active) 315 return NULL; 316 317 if (!atomic_inc_not_zero(&sa->refcnt)) 318 return NULL; 319 320 return sa; 321 } 322 323 static void free_rx_sc_rcu(struct rcu_head *head) 324 { 325 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head); 326 327 free_percpu(rx_sc->stats); 328 kfree(rx_sc); 329 } 330 331 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc) 332 { 333 return atomic_inc_not_zero(&sc->refcnt) ? sc : NULL; 334 } 335 336 static void macsec_rxsc_put(struct macsec_rx_sc *sc) 337 { 338 if (atomic_dec_and_test(&sc->refcnt)) 339 call_rcu(&sc->rcu_head, free_rx_sc_rcu); 340 } 341 342 static void free_rxsa(struct rcu_head *head) 343 { 344 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu); 345 346 crypto_free_aead(sa->key.tfm); 347 free_percpu(sa->stats); 348 kfree(sa); 349 } 350 351 static void macsec_rxsa_put(struct macsec_rx_sa *sa) 352 { 353 if (atomic_dec_and_test(&sa->refcnt)) 354 call_rcu(&sa->rcu, free_rxsa); 355 } 356 357 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr) 358 { 359 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr); 360 361 if (!sa || !sa->active) 362 return NULL; 363 364 if (!atomic_inc_not_zero(&sa->refcnt)) 365 return NULL; 366 367 return sa; 368 } 369 370 static void free_txsa(struct rcu_head *head) 371 { 372 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu); 373 374 crypto_free_aead(sa->key.tfm); 375 free_percpu(sa->stats); 376 kfree(sa); 377 } 378 379 static void macsec_txsa_put(struct macsec_tx_sa *sa) 380 { 381 if (atomic_dec_and_test(&sa->refcnt)) 382 call_rcu(&sa->rcu, free_txsa); 383 } 384 385 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) 386 { 387 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); 388 return (struct macsec_cb *)skb->cb; 389 } 390 391 #define MACSEC_PORT_ES (htons(0x0001)) 392 #define MACSEC_PORT_SCB (0x0000) 393 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL) 394 395 #define DEFAULT_SAK_LEN 16 396 #define DEFAULT_SEND_SCI true 397 #define DEFAULT_ENCRYPT false 398 #define DEFAULT_ENCODING_SA 0 399 400 static sci_t make_sci(u8 *addr, __be16 port) 401 { 402 sci_t sci; 403 404 memcpy(&sci, addr, ETH_ALEN); 405 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); 406 407 return sci; 408 } 409 410 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present) 411 { 412 sci_t sci; 413 414 if (sci_present) 415 memcpy(&sci, hdr->secure_channel_id, 416 sizeof(hdr->secure_channel_id)); 417 else 418 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); 419 420 return sci; 421 } 422 423 static unsigned int macsec_sectag_len(bool sci_present) 424 { 425 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); 426 } 427 428 static unsigned int macsec_hdr_len(bool sci_present) 429 { 430 return macsec_sectag_len(sci_present) + ETH_HLEN; 431 } 432 433 static unsigned int macsec_extra_len(bool sci_present) 434 { 435 return macsec_sectag_len(sci_present) + sizeof(__be16); 436 } 437 438 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ 439 static void macsec_fill_sectag(struct macsec_eth_header *h, 440 const struct macsec_secy *secy, u32 pn) 441 { 442 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 443 444 memset(&h->tci_an, 0, macsec_sectag_len(tx_sc->send_sci)); 445 h->eth.h_proto = htons(ETH_P_MACSEC); 446 447 if (tx_sc->send_sci || 448 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb)) { 449 h->tci_an |= MACSEC_TCI_SC; 450 memcpy(&h->secure_channel_id, &secy->sci, 451 sizeof(h->secure_channel_id)); 452 } else { 453 if (tx_sc->end_station) 454 h->tci_an |= MACSEC_TCI_ES; 455 if (tx_sc->scb) 456 h->tci_an |= MACSEC_TCI_SCB; 457 } 458 459 h->packet_number = htonl(pn); 460 461 /* with GCM, C/E clear for !encrypt, both set for encrypt */ 462 if (tx_sc->encrypt) 463 h->tci_an |= MACSEC_TCI_CONFID; 464 else if (secy->icv_len != DEFAULT_ICV_LEN) 465 h->tci_an |= MACSEC_TCI_C; 466 467 h->tci_an |= tx_sc->encoding_sa; 468 } 469 470 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) 471 { 472 if (data_len < MIN_NON_SHORT_LEN) 473 h->short_length = data_len; 474 } 475 476 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */ 477 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len) 478 { 479 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; 480 int len = skb->len - 2 * ETH_ALEN; 481 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; 482 483 /* a) It comprises at least 17 octets */ 484 if (skb->len <= 16) 485 return false; 486 487 /* b) MACsec EtherType: already checked */ 488 489 /* c) V bit is clear */ 490 if (h->tci_an & MACSEC_TCI_VERSION) 491 return false; 492 493 /* d) ES or SCB => !SC */ 494 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && 495 (h->tci_an & MACSEC_TCI_SC)) 496 return false; 497 498 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ 499 if (h->unused) 500 return false; 501 502 /* rx.pn != 0 (figure 10-5) */ 503 if (!h->packet_number) 504 return false; 505 506 /* length check, f) g) h) i) */ 507 if (h->short_length) 508 return len == extra_len + h->short_length; 509 return len >= extra_len + MIN_NON_SHORT_LEN; 510 } 511 512 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) 513 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN 514 515 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) 516 { 517 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; 518 519 gcm_iv->sci = sci; 520 gcm_iv->pn = htonl(pn); 521 } 522 523 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) 524 { 525 return (struct macsec_eth_header *)skb_mac_header(skb); 526 } 527 528 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy) 529 { 530 u32 pn; 531 532 spin_lock_bh(&tx_sa->lock); 533 pn = tx_sa->next_pn; 534 535 tx_sa->next_pn++; 536 if (tx_sa->next_pn == 0) { 537 pr_debug("PN wrapped, transitioning to !oper\n"); 538 tx_sa->active = false; 539 if (secy->protect_frames) 540 secy->operational = false; 541 } 542 spin_unlock_bh(&tx_sa->lock); 543 544 return pn; 545 } 546 547 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) 548 { 549 struct macsec_dev *macsec = netdev_priv(dev); 550 551 skb->dev = macsec->real_dev; 552 skb_reset_mac_header(skb); 553 skb->protocol = eth_hdr(skb)->h_proto; 554 } 555 556 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, 557 struct macsec_tx_sa *tx_sa) 558 { 559 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); 560 561 u64_stats_update_begin(&txsc_stats->syncp); 562 if (tx_sc->encrypt) { 563 txsc_stats->stats.OutOctetsEncrypted += skb->len; 564 txsc_stats->stats.OutPktsEncrypted++; 565 this_cpu_inc(tx_sa->stats->OutPktsEncrypted); 566 } else { 567 txsc_stats->stats.OutOctetsProtected += skb->len; 568 txsc_stats->stats.OutPktsProtected++; 569 this_cpu_inc(tx_sa->stats->OutPktsProtected); 570 } 571 u64_stats_update_end(&txsc_stats->syncp); 572 } 573 574 static void count_tx(struct net_device *dev, int ret, int len) 575 { 576 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 577 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 578 579 u64_stats_update_begin(&stats->syncp); 580 stats->tx_packets++; 581 stats->tx_bytes += len; 582 u64_stats_update_end(&stats->syncp); 583 } else { 584 dev->stats.tx_dropped++; 585 } 586 } 587 588 static void macsec_encrypt_done(struct crypto_async_request *base, int err) 589 { 590 struct sk_buff *skb = base->data; 591 struct net_device *dev = skb->dev; 592 struct macsec_dev *macsec = macsec_priv(dev); 593 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 594 int len, ret; 595 596 aead_request_free(macsec_skb_cb(skb)->req); 597 598 rcu_read_lock_bh(); 599 macsec_encrypt_finish(skb, dev); 600 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 601 len = skb->len; 602 ret = dev_queue_xmit(skb); 603 count_tx(dev, ret, len); 604 rcu_read_unlock_bh(); 605 606 macsec_txsa_put(sa); 607 dev_put(dev); 608 } 609 610 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, 611 unsigned char **iv, 612 struct scatterlist **sg) 613 { 614 size_t size, iv_offset, sg_offset; 615 struct aead_request *req; 616 void *tmp; 617 618 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); 619 iv_offset = size; 620 size += GCM_AES_IV_LEN; 621 622 size = ALIGN(size, __alignof__(struct scatterlist)); 623 sg_offset = size; 624 size += sizeof(struct scatterlist) * (MAX_SKB_FRAGS + 1); 625 626 tmp = kmalloc(size, GFP_ATOMIC); 627 if (!tmp) 628 return NULL; 629 630 *iv = (unsigned char *)(tmp + iv_offset); 631 *sg = (struct scatterlist *)(tmp + sg_offset); 632 req = tmp; 633 634 aead_request_set_tfm(req, tfm); 635 636 return req; 637 } 638 639 static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 640 struct net_device *dev) 641 { 642 int ret; 643 struct scatterlist *sg; 644 unsigned char *iv; 645 struct ethhdr *eth; 646 struct macsec_eth_header *hh; 647 size_t unprotected_len; 648 struct aead_request *req; 649 struct macsec_secy *secy; 650 struct macsec_tx_sc *tx_sc; 651 struct macsec_tx_sa *tx_sa; 652 struct macsec_dev *macsec = macsec_priv(dev); 653 u32 pn; 654 655 secy = &macsec->secy; 656 tx_sc = &secy->tx_sc; 657 658 /* 10.5.1 TX SA assignment */ 659 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); 660 if (!tx_sa) { 661 secy->operational = false; 662 kfree_skb(skb); 663 return ERR_PTR(-EINVAL); 664 } 665 666 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || 667 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { 668 struct sk_buff *nskb = skb_copy_expand(skb, 669 MACSEC_NEEDED_HEADROOM, 670 MACSEC_NEEDED_TAILROOM, 671 GFP_ATOMIC); 672 if (likely(nskb)) { 673 consume_skb(skb); 674 skb = nskb; 675 } else { 676 macsec_txsa_put(tx_sa); 677 kfree_skb(skb); 678 return ERR_PTR(-ENOMEM); 679 } 680 } else { 681 skb = skb_unshare(skb, GFP_ATOMIC); 682 if (!skb) { 683 macsec_txsa_put(tx_sa); 684 return ERR_PTR(-ENOMEM); 685 } 686 } 687 688 unprotected_len = skb->len; 689 eth = eth_hdr(skb); 690 hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(tx_sc->send_sci)); 691 memmove(hh, eth, 2 * ETH_ALEN); 692 693 pn = tx_sa_update_pn(tx_sa, secy); 694 if (pn == 0) { 695 macsec_txsa_put(tx_sa); 696 kfree_skb(skb); 697 return ERR_PTR(-ENOLINK); 698 } 699 macsec_fill_sectag(hh, secy, pn); 700 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); 701 702 skb_put(skb, secy->icv_len); 703 704 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { 705 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 706 707 u64_stats_update_begin(&secy_stats->syncp); 708 secy_stats->stats.OutPktsTooLong++; 709 u64_stats_update_end(&secy_stats->syncp); 710 711 macsec_txsa_put(tx_sa); 712 kfree_skb(skb); 713 return ERR_PTR(-EINVAL); 714 } 715 716 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg); 717 if (!req) { 718 macsec_txsa_put(tx_sa); 719 kfree_skb(skb); 720 return ERR_PTR(-ENOMEM); 721 } 722 723 macsec_fill_iv(iv, secy->sci, pn); 724 725 sg_init_table(sg, MAX_SKB_FRAGS + 1); 726 skb_to_sgvec(skb, sg, 0, skb->len); 727 728 if (tx_sc->encrypt) { 729 int len = skb->len - macsec_hdr_len(tx_sc->send_sci) - 730 secy->icv_len; 731 aead_request_set_crypt(req, sg, sg, len, iv); 732 aead_request_set_ad(req, macsec_hdr_len(tx_sc->send_sci)); 733 } else { 734 aead_request_set_crypt(req, sg, sg, 0, iv); 735 aead_request_set_ad(req, skb->len - secy->icv_len); 736 } 737 738 macsec_skb_cb(skb)->req = req; 739 macsec_skb_cb(skb)->tx_sa = tx_sa; 740 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 741 742 dev_hold(skb->dev); 743 ret = crypto_aead_encrypt(req); 744 if (ret == -EINPROGRESS) { 745 return ERR_PTR(ret); 746 } else if (ret != 0) { 747 dev_put(skb->dev); 748 kfree_skb(skb); 749 aead_request_free(req); 750 macsec_txsa_put(tx_sa); 751 return ERR_PTR(-EINVAL); 752 } 753 754 dev_put(skb->dev); 755 aead_request_free(req); 756 macsec_txsa_put(tx_sa); 757 758 return skb; 759 } 760 761 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 762 { 763 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 764 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 765 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 766 u32 lowest_pn = 0; 767 768 spin_lock(&rx_sa->lock); 769 if (rx_sa->next_pn >= secy->replay_window) 770 lowest_pn = rx_sa->next_pn - secy->replay_window; 771 772 /* Now perform replay protection check again 773 * (see IEEE 802.1AE-2006 figure 10-5) 774 */ 775 if (secy->replay_protect && pn < lowest_pn) { 776 spin_unlock(&rx_sa->lock); 777 u64_stats_update_begin(&rxsc_stats->syncp); 778 rxsc_stats->stats.InPktsLate++; 779 u64_stats_update_end(&rxsc_stats->syncp); 780 return false; 781 } 782 783 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 784 u64_stats_update_begin(&rxsc_stats->syncp); 785 if (hdr->tci_an & MACSEC_TCI_E) 786 rxsc_stats->stats.InOctetsDecrypted += skb->len; 787 else 788 rxsc_stats->stats.InOctetsValidated += skb->len; 789 u64_stats_update_end(&rxsc_stats->syncp); 790 } 791 792 if (!macsec_skb_cb(skb)->valid) { 793 spin_unlock(&rx_sa->lock); 794 795 /* 10.6.5 */ 796 if (hdr->tci_an & MACSEC_TCI_C || 797 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 798 u64_stats_update_begin(&rxsc_stats->syncp); 799 rxsc_stats->stats.InPktsNotValid++; 800 u64_stats_update_end(&rxsc_stats->syncp); 801 return false; 802 } 803 804 u64_stats_update_begin(&rxsc_stats->syncp); 805 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 806 rxsc_stats->stats.InPktsInvalid++; 807 this_cpu_inc(rx_sa->stats->InPktsInvalid); 808 } else if (pn < lowest_pn) { 809 rxsc_stats->stats.InPktsDelayed++; 810 } else { 811 rxsc_stats->stats.InPktsUnchecked++; 812 } 813 u64_stats_update_end(&rxsc_stats->syncp); 814 } else { 815 u64_stats_update_begin(&rxsc_stats->syncp); 816 if (pn < lowest_pn) { 817 rxsc_stats->stats.InPktsDelayed++; 818 } else { 819 rxsc_stats->stats.InPktsOK++; 820 this_cpu_inc(rx_sa->stats->InPktsOK); 821 } 822 u64_stats_update_end(&rxsc_stats->syncp); 823 824 if (pn >= rx_sa->next_pn) 825 rx_sa->next_pn = pn + 1; 826 spin_unlock(&rx_sa->lock); 827 } 828 829 return true; 830 } 831 832 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 833 { 834 skb->pkt_type = PACKET_HOST; 835 skb->protocol = eth_type_trans(skb, dev); 836 837 skb_reset_network_header(skb); 838 if (!skb_transport_header_was_set(skb)) 839 skb_reset_transport_header(skb); 840 skb_reset_mac_len(skb); 841 } 842 843 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 844 { 845 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 846 skb_pull(skb, hdr_len); 847 pskb_trim_unique(skb, skb->len - icv_len); 848 } 849 850 static void count_rx(struct net_device *dev, int len) 851 { 852 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 853 854 u64_stats_update_begin(&stats->syncp); 855 stats->rx_packets++; 856 stats->rx_bytes += len; 857 u64_stats_update_end(&stats->syncp); 858 } 859 860 static void macsec_decrypt_done(struct crypto_async_request *base, int err) 861 { 862 struct sk_buff *skb = base->data; 863 struct net_device *dev = skb->dev; 864 struct macsec_dev *macsec = macsec_priv(dev); 865 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 866 struct macsec_rx_sc *rx_sc = rx_sa->sc; 867 int len, ret; 868 u32 pn; 869 870 aead_request_free(macsec_skb_cb(skb)->req); 871 872 rcu_read_lock_bh(); 873 pn = ntohl(macsec_ethhdr(skb)->packet_number); 874 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 875 rcu_read_unlock_bh(); 876 kfree_skb(skb); 877 goto out; 878 } 879 880 macsec_finalize_skb(skb, macsec->secy.icv_len, 881 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 882 macsec_reset_skb(skb, macsec->secy.netdev); 883 884 len = skb->len; 885 ret = gro_cells_receive(&macsec->gro_cells, skb); 886 if (ret == NET_RX_SUCCESS) 887 count_rx(dev, len); 888 else 889 macsec->secy.netdev->stats.rx_dropped++; 890 891 rcu_read_unlock_bh(); 892 893 out: 894 macsec_rxsa_put(rx_sa); 895 macsec_rxsc_put(rx_sc); 896 dev_put(dev); 897 } 898 899 static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 900 struct net_device *dev, 901 struct macsec_rx_sa *rx_sa, 902 sci_t sci, 903 struct macsec_secy *secy) 904 { 905 int ret; 906 struct scatterlist *sg; 907 unsigned char *iv; 908 struct aead_request *req; 909 struct macsec_eth_header *hdr; 910 u16 icv_len = secy->icv_len; 911 912 macsec_skb_cb(skb)->valid = false; 913 skb = skb_share_check(skb, GFP_ATOMIC); 914 if (!skb) 915 return ERR_PTR(-ENOMEM); 916 917 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg); 918 if (!req) { 919 kfree_skb(skb); 920 return ERR_PTR(-ENOMEM); 921 } 922 923 hdr = (struct macsec_eth_header *)skb->data; 924 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number)); 925 926 sg_init_table(sg, MAX_SKB_FRAGS + 1); 927 skb_to_sgvec(skb, sg, 0, skb->len); 928 929 if (hdr->tci_an & MACSEC_TCI_E) { 930 /* confidentiality: ethernet + macsec header 931 * authenticated, encrypted payload 932 */ 933 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 934 935 aead_request_set_crypt(req, sg, sg, len, iv); 936 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 937 skb = skb_unshare(skb, GFP_ATOMIC); 938 if (!skb) { 939 aead_request_free(req); 940 return ERR_PTR(-ENOMEM); 941 } 942 } else { 943 /* integrity only: all headers + data authenticated */ 944 aead_request_set_crypt(req, sg, sg, icv_len, iv); 945 aead_request_set_ad(req, skb->len - icv_len); 946 } 947 948 macsec_skb_cb(skb)->req = req; 949 skb->dev = dev; 950 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 951 952 dev_hold(dev); 953 ret = crypto_aead_decrypt(req); 954 if (ret == -EINPROGRESS) { 955 return ERR_PTR(ret); 956 } else if (ret != 0) { 957 /* decryption/authentication failed 958 * 10.6 if validateFrames is disabled, deliver anyway 959 */ 960 if (ret != -EBADMSG) { 961 kfree_skb(skb); 962 skb = ERR_PTR(ret); 963 } 964 } else { 965 macsec_skb_cb(skb)->valid = true; 966 } 967 dev_put(dev); 968 969 aead_request_free(req); 970 971 return skb; 972 } 973 974 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 975 { 976 struct macsec_rx_sc *rx_sc; 977 978 for_each_rxsc(secy, rx_sc) { 979 if (rx_sc->sci == sci) 980 return rx_sc; 981 } 982 983 return NULL; 984 } 985 986 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 987 { 988 struct macsec_rx_sc *rx_sc; 989 990 for_each_rxsc_rtnl(secy, rx_sc) { 991 if (rx_sc->sci == sci) 992 return rx_sc; 993 } 994 995 return NULL; 996 } 997 998 static void handle_not_macsec(struct sk_buff *skb) 999 { 1000 struct macsec_rxh_data *rxd; 1001 struct macsec_dev *macsec; 1002 1003 rcu_read_lock(); 1004 rxd = macsec_data_rcu(skb->dev); 1005 1006 /* 10.6 If the management control validateFrames is not 1007 * Strict, frames without a SecTAG are received, counted, and 1008 * delivered to the Controlled Port 1009 */ 1010 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1011 struct sk_buff *nskb; 1012 int ret; 1013 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 1014 1015 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1016 u64_stats_update_begin(&secy_stats->syncp); 1017 secy_stats->stats.InPktsNoTag++; 1018 u64_stats_update_end(&secy_stats->syncp); 1019 continue; 1020 } 1021 1022 /* deliver on this port */ 1023 nskb = skb_clone(skb, GFP_ATOMIC); 1024 if (!nskb) 1025 break; 1026 1027 nskb->dev = macsec->secy.netdev; 1028 1029 ret = netif_rx(nskb); 1030 if (ret == NET_RX_SUCCESS) { 1031 u64_stats_update_begin(&secy_stats->syncp); 1032 secy_stats->stats.InPktsUntagged++; 1033 u64_stats_update_end(&secy_stats->syncp); 1034 } else { 1035 macsec->secy.netdev->stats.rx_dropped++; 1036 } 1037 } 1038 1039 rcu_read_unlock(); 1040 } 1041 1042 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 1043 { 1044 struct sk_buff *skb = *pskb; 1045 struct net_device *dev = skb->dev; 1046 struct macsec_eth_header *hdr; 1047 struct macsec_secy *secy = NULL; 1048 struct macsec_rx_sc *rx_sc; 1049 struct macsec_rx_sa *rx_sa; 1050 struct macsec_rxh_data *rxd; 1051 struct macsec_dev *macsec; 1052 sci_t sci; 1053 u32 pn; 1054 bool cbit; 1055 struct pcpu_rx_sc_stats *rxsc_stats; 1056 struct pcpu_secy_stats *secy_stats; 1057 bool pulled_sci; 1058 int ret; 1059 1060 if (skb_headroom(skb) < ETH_HLEN) 1061 goto drop_direct; 1062 1063 hdr = macsec_ethhdr(skb); 1064 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) { 1065 handle_not_macsec(skb); 1066 1067 /* and deliver to the uncontrolled port */ 1068 return RX_HANDLER_PASS; 1069 } 1070 1071 skb = skb_unshare(skb, GFP_ATOMIC); 1072 if (!skb) { 1073 *pskb = NULL; 1074 return RX_HANDLER_CONSUMED; 1075 } 1076 1077 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1078 if (!pulled_sci) { 1079 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1080 goto drop_direct; 1081 } 1082 1083 hdr = macsec_ethhdr(skb); 1084 1085 /* Frames with a SecTAG that has the TCI E bit set but the C 1086 * bit clear are discarded, as this reserved encoding is used 1087 * to identify frames with a SecTAG that are not to be 1088 * delivered to the Controlled Port. 1089 */ 1090 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1091 return RX_HANDLER_PASS; 1092 1093 /* now, pull the extra length */ 1094 if (hdr->tci_an & MACSEC_TCI_SC) { 1095 if (!pulled_sci) 1096 goto drop_direct; 1097 } 1098 1099 /* ethernet header is part of crypto processing */ 1100 skb_push(skb, ETH_HLEN); 1101 1102 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1103 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1104 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci); 1105 1106 rcu_read_lock(); 1107 rxd = macsec_data_rcu(skb->dev); 1108 1109 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1110 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1111 sc = sc ? macsec_rxsc_get(sc) : NULL; 1112 1113 if (sc) { 1114 secy = &macsec->secy; 1115 rx_sc = sc; 1116 break; 1117 } 1118 } 1119 1120 if (!secy) 1121 goto nosci; 1122 1123 dev = secy->netdev; 1124 macsec = macsec_priv(dev); 1125 secy_stats = this_cpu_ptr(macsec->stats); 1126 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1127 1128 if (!macsec_validate_skb(skb, secy->icv_len)) { 1129 u64_stats_update_begin(&secy_stats->syncp); 1130 secy_stats->stats.InPktsBadTag++; 1131 u64_stats_update_end(&secy_stats->syncp); 1132 goto drop_nosa; 1133 } 1134 1135 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1136 if (!rx_sa) { 1137 /* 10.6.1 if the SA is not in use */ 1138 1139 /* If validateFrames is Strict or the C bit in the 1140 * SecTAG is set, discard 1141 */ 1142 if (hdr->tci_an & MACSEC_TCI_C || 1143 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1144 u64_stats_update_begin(&rxsc_stats->syncp); 1145 rxsc_stats->stats.InPktsNotUsingSA++; 1146 u64_stats_update_end(&rxsc_stats->syncp); 1147 goto drop_nosa; 1148 } 1149 1150 /* not Strict, the frame (with the SecTAG and ICV 1151 * removed) is delivered to the Controlled Port. 1152 */ 1153 u64_stats_update_begin(&rxsc_stats->syncp); 1154 rxsc_stats->stats.InPktsUnusedSA++; 1155 u64_stats_update_end(&rxsc_stats->syncp); 1156 goto deliver; 1157 } 1158 1159 /* First, PN check to avoid decrypting obviously wrong packets */ 1160 pn = ntohl(hdr->packet_number); 1161 if (secy->replay_protect) { 1162 bool late; 1163 1164 spin_lock(&rx_sa->lock); 1165 late = rx_sa->next_pn >= secy->replay_window && 1166 pn < (rx_sa->next_pn - secy->replay_window); 1167 spin_unlock(&rx_sa->lock); 1168 1169 if (late) { 1170 u64_stats_update_begin(&rxsc_stats->syncp); 1171 rxsc_stats->stats.InPktsLate++; 1172 u64_stats_update_end(&rxsc_stats->syncp); 1173 goto drop; 1174 } 1175 } 1176 1177 macsec_skb_cb(skb)->rx_sa = rx_sa; 1178 1179 /* Disabled && !changed text => skip validation */ 1180 if (hdr->tci_an & MACSEC_TCI_C || 1181 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1182 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1183 1184 if (IS_ERR(skb)) { 1185 /* the decrypt callback needs the reference */ 1186 if (PTR_ERR(skb) != -EINPROGRESS) { 1187 macsec_rxsa_put(rx_sa); 1188 macsec_rxsc_put(rx_sc); 1189 } 1190 rcu_read_unlock(); 1191 *pskb = NULL; 1192 return RX_HANDLER_CONSUMED; 1193 } 1194 1195 if (!macsec_post_decrypt(skb, secy, pn)) 1196 goto drop; 1197 1198 deliver: 1199 macsec_finalize_skb(skb, secy->icv_len, 1200 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1201 macsec_reset_skb(skb, secy->netdev); 1202 1203 if (rx_sa) 1204 macsec_rxsa_put(rx_sa); 1205 macsec_rxsc_put(rx_sc); 1206 1207 ret = gro_cells_receive(&macsec->gro_cells, skb); 1208 if (ret == NET_RX_SUCCESS) 1209 count_rx(dev, skb->len); 1210 else 1211 macsec->secy.netdev->stats.rx_dropped++; 1212 1213 rcu_read_unlock(); 1214 1215 *pskb = NULL; 1216 return RX_HANDLER_CONSUMED; 1217 1218 drop: 1219 macsec_rxsa_put(rx_sa); 1220 drop_nosa: 1221 macsec_rxsc_put(rx_sc); 1222 rcu_read_unlock(); 1223 drop_direct: 1224 kfree_skb(skb); 1225 *pskb = NULL; 1226 return RX_HANDLER_CONSUMED; 1227 1228 nosci: 1229 /* 10.6.1 if the SC is not found */ 1230 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1231 if (!cbit) 1232 macsec_finalize_skb(skb, DEFAULT_ICV_LEN, 1233 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1234 1235 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1236 struct sk_buff *nskb; 1237 1238 secy_stats = this_cpu_ptr(macsec->stats); 1239 1240 /* If validateFrames is Strict or the C bit in the 1241 * SecTAG is set, discard 1242 */ 1243 if (cbit || 1244 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1245 u64_stats_update_begin(&secy_stats->syncp); 1246 secy_stats->stats.InPktsNoSCI++; 1247 u64_stats_update_end(&secy_stats->syncp); 1248 continue; 1249 } 1250 1251 /* not strict, the frame (with the SecTAG and ICV 1252 * removed) is delivered to the Controlled Port. 1253 */ 1254 nskb = skb_clone(skb, GFP_ATOMIC); 1255 if (!nskb) 1256 break; 1257 1258 macsec_reset_skb(nskb, macsec->secy.netdev); 1259 1260 ret = netif_rx(nskb); 1261 if (ret == NET_RX_SUCCESS) { 1262 u64_stats_update_begin(&secy_stats->syncp); 1263 secy_stats->stats.InPktsUnknownSCI++; 1264 u64_stats_update_end(&secy_stats->syncp); 1265 } else { 1266 macsec->secy.netdev->stats.rx_dropped++; 1267 } 1268 } 1269 1270 rcu_read_unlock(); 1271 *pskb = skb; 1272 return RX_HANDLER_PASS; 1273 } 1274 1275 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1276 { 1277 struct crypto_aead *tfm; 1278 int ret; 1279 1280 tfm = crypto_alloc_aead("gcm(aes)", 0, 0); 1281 1282 if (IS_ERR(tfm)) 1283 return tfm; 1284 1285 ret = crypto_aead_setkey(tfm, key, key_len); 1286 if (ret < 0) 1287 goto fail; 1288 1289 ret = crypto_aead_setauthsize(tfm, icv_len); 1290 if (ret < 0) 1291 goto fail; 1292 1293 return tfm; 1294 fail: 1295 crypto_free_aead(tfm); 1296 return ERR_PTR(ret); 1297 } 1298 1299 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1300 int icv_len) 1301 { 1302 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1303 if (!rx_sa->stats) 1304 return -ENOMEM; 1305 1306 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1307 if (IS_ERR(rx_sa->key.tfm)) { 1308 free_percpu(rx_sa->stats); 1309 return PTR_ERR(rx_sa->key.tfm); 1310 } 1311 1312 rx_sa->active = false; 1313 rx_sa->next_pn = 1; 1314 atomic_set(&rx_sa->refcnt, 1); 1315 spin_lock_init(&rx_sa->lock); 1316 1317 return 0; 1318 } 1319 1320 static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1321 { 1322 rx_sa->active = false; 1323 1324 macsec_rxsa_put(rx_sa); 1325 } 1326 1327 static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1328 { 1329 int i; 1330 1331 for (i = 0; i < MACSEC_NUM_AN; i++) { 1332 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1333 1334 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1335 if (sa) 1336 clear_rx_sa(sa); 1337 } 1338 1339 macsec_rxsc_put(rx_sc); 1340 } 1341 1342 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1343 { 1344 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1345 1346 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1347 rx_sc; 1348 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1349 if (rx_sc->sci == sci) { 1350 if (rx_sc->active) 1351 secy->n_rx_sc--; 1352 rcu_assign_pointer(*rx_scp, rx_sc->next); 1353 return rx_sc; 1354 } 1355 } 1356 1357 return NULL; 1358 } 1359 1360 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci) 1361 { 1362 struct macsec_rx_sc *rx_sc; 1363 struct macsec_dev *macsec; 1364 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1365 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1366 struct macsec_secy *secy; 1367 1368 list_for_each_entry(macsec, &rxd->secys, secys) { 1369 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1370 return ERR_PTR(-EEXIST); 1371 } 1372 1373 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL); 1374 if (!rx_sc) 1375 return ERR_PTR(-ENOMEM); 1376 1377 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1378 if (!rx_sc->stats) { 1379 kfree(rx_sc); 1380 return ERR_PTR(-ENOMEM); 1381 } 1382 1383 rx_sc->sci = sci; 1384 rx_sc->active = true; 1385 atomic_set(&rx_sc->refcnt, 1); 1386 1387 secy = &macsec_priv(dev)->secy; 1388 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1389 rcu_assign_pointer(secy->rx_sc, rx_sc); 1390 1391 if (rx_sc->active) 1392 secy->n_rx_sc++; 1393 1394 return rx_sc; 1395 } 1396 1397 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1398 int icv_len) 1399 { 1400 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1401 if (!tx_sa->stats) 1402 return -ENOMEM; 1403 1404 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1405 if (IS_ERR(tx_sa->key.tfm)) { 1406 free_percpu(tx_sa->stats); 1407 return PTR_ERR(tx_sa->key.tfm); 1408 } 1409 1410 tx_sa->active = false; 1411 atomic_set(&tx_sa->refcnt, 1); 1412 spin_lock_init(&tx_sa->lock); 1413 1414 return 0; 1415 } 1416 1417 static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1418 { 1419 tx_sa->active = false; 1420 1421 macsec_txsa_put(tx_sa); 1422 } 1423 1424 static struct genl_family macsec_fam = { 1425 .id = GENL_ID_GENERATE, 1426 .name = MACSEC_GENL_NAME, 1427 .hdrsize = 0, 1428 .version = MACSEC_GENL_VERSION, 1429 .maxattr = MACSEC_ATTR_MAX, 1430 .netnsok = true, 1431 }; 1432 1433 static struct net_device *get_dev_from_nl(struct net *net, 1434 struct nlattr **attrs) 1435 { 1436 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1437 struct net_device *dev; 1438 1439 dev = __dev_get_by_index(net, ifindex); 1440 if (!dev) 1441 return ERR_PTR(-ENODEV); 1442 1443 if (!netif_is_macsec(dev)) 1444 return ERR_PTR(-ENODEV); 1445 1446 return dev; 1447 } 1448 1449 static sci_t nla_get_sci(const struct nlattr *nla) 1450 { 1451 return (__force sci_t)nla_get_u64(nla); 1452 } 1453 1454 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, 1455 int padattr) 1456 { 1457 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); 1458 } 1459 1460 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1461 struct nlattr **attrs, 1462 struct nlattr **tb_sa, 1463 struct net_device **devp, 1464 struct macsec_secy **secyp, 1465 struct macsec_tx_sc **scp, 1466 u8 *assoc_num) 1467 { 1468 struct net_device *dev; 1469 struct macsec_secy *secy; 1470 struct macsec_tx_sc *tx_sc; 1471 struct macsec_tx_sa *tx_sa; 1472 1473 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1474 return ERR_PTR(-EINVAL); 1475 1476 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1477 1478 dev = get_dev_from_nl(net, attrs); 1479 if (IS_ERR(dev)) 1480 return ERR_CAST(dev); 1481 1482 if (*assoc_num >= MACSEC_NUM_AN) 1483 return ERR_PTR(-EINVAL); 1484 1485 secy = &macsec_priv(dev)->secy; 1486 tx_sc = &secy->tx_sc; 1487 1488 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1489 if (!tx_sa) 1490 return ERR_PTR(-ENODEV); 1491 1492 *devp = dev; 1493 *scp = tx_sc; 1494 *secyp = secy; 1495 return tx_sa; 1496 } 1497 1498 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1499 struct nlattr **attrs, 1500 struct nlattr **tb_rxsc, 1501 struct net_device **devp, 1502 struct macsec_secy **secyp) 1503 { 1504 struct net_device *dev; 1505 struct macsec_secy *secy; 1506 struct macsec_rx_sc *rx_sc; 1507 sci_t sci; 1508 1509 dev = get_dev_from_nl(net, attrs); 1510 if (IS_ERR(dev)) 1511 return ERR_CAST(dev); 1512 1513 secy = &macsec_priv(dev)->secy; 1514 1515 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1516 return ERR_PTR(-EINVAL); 1517 1518 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1519 rx_sc = find_rx_sc_rtnl(secy, sci); 1520 if (!rx_sc) 1521 return ERR_PTR(-ENODEV); 1522 1523 *secyp = secy; 1524 *devp = dev; 1525 1526 return rx_sc; 1527 } 1528 1529 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1530 struct nlattr **attrs, 1531 struct nlattr **tb_rxsc, 1532 struct nlattr **tb_sa, 1533 struct net_device **devp, 1534 struct macsec_secy **secyp, 1535 struct macsec_rx_sc **scp, 1536 u8 *assoc_num) 1537 { 1538 struct macsec_rx_sc *rx_sc; 1539 struct macsec_rx_sa *rx_sa; 1540 1541 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1542 return ERR_PTR(-EINVAL); 1543 1544 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1545 if (*assoc_num >= MACSEC_NUM_AN) 1546 return ERR_PTR(-EINVAL); 1547 1548 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1549 if (IS_ERR(rx_sc)) 1550 return ERR_CAST(rx_sc); 1551 1552 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1553 if (!rx_sa) 1554 return ERR_PTR(-ENODEV); 1555 1556 *scp = rx_sc; 1557 return rx_sa; 1558 } 1559 1560 1561 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1562 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1563 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1564 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1565 }; 1566 1567 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1568 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1569 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, 1570 }; 1571 1572 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1573 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, 1574 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, 1575 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 }, 1576 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY, 1577 .len = MACSEC_KEYID_LEN, }, 1578 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1579 .len = MACSEC_MAX_KEY_LEN, }, 1580 }; 1581 1582 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1583 { 1584 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1585 return -EINVAL; 1586 1587 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], 1588 macsec_genl_sa_policy)) 1589 return -EINVAL; 1590 1591 return 0; 1592 } 1593 1594 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1595 { 1596 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1597 return -EINVAL; 1598 1599 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], 1600 macsec_genl_rxsc_policy)) 1601 return -EINVAL; 1602 1603 return 0; 1604 } 1605 1606 static bool validate_add_rxsa(struct nlattr **attrs) 1607 { 1608 if (!attrs[MACSEC_SA_ATTR_AN] || 1609 !attrs[MACSEC_SA_ATTR_KEY] || 1610 !attrs[MACSEC_SA_ATTR_KEYID]) 1611 return false; 1612 1613 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1614 return false; 1615 1616 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1617 return false; 1618 1619 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1620 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1621 return false; 1622 } 1623 1624 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1625 return false; 1626 1627 return true; 1628 } 1629 1630 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1631 { 1632 struct net_device *dev; 1633 struct nlattr **attrs = info->attrs; 1634 struct macsec_secy *secy; 1635 struct macsec_rx_sc *rx_sc; 1636 struct macsec_rx_sa *rx_sa; 1637 unsigned char assoc_num; 1638 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1639 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1640 int err; 1641 1642 if (!attrs[MACSEC_ATTR_IFINDEX]) 1643 return -EINVAL; 1644 1645 if (parse_sa_config(attrs, tb_sa)) 1646 return -EINVAL; 1647 1648 if (parse_rxsc_config(attrs, tb_rxsc)) 1649 return -EINVAL; 1650 1651 if (!validate_add_rxsa(tb_sa)) 1652 return -EINVAL; 1653 1654 rtnl_lock(); 1655 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1656 if (IS_ERR(rx_sc)) { 1657 rtnl_unlock(); 1658 return PTR_ERR(rx_sc); 1659 } 1660 1661 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1662 1663 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1664 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1665 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1666 rtnl_unlock(); 1667 return -EINVAL; 1668 } 1669 1670 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1671 if (rx_sa) { 1672 rtnl_unlock(); 1673 return -EBUSY; 1674 } 1675 1676 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1677 if (!rx_sa) { 1678 rtnl_unlock(); 1679 return -ENOMEM; 1680 } 1681 1682 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1683 secy->key_len, secy->icv_len); 1684 if (err < 0) { 1685 kfree(rx_sa); 1686 rtnl_unlock(); 1687 return err; 1688 } 1689 1690 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1691 spin_lock_bh(&rx_sa->lock); 1692 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1693 spin_unlock_bh(&rx_sa->lock); 1694 } 1695 1696 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1697 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1698 1699 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1700 rx_sa->sc = rx_sc; 1701 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1702 1703 rtnl_unlock(); 1704 1705 return 0; 1706 } 1707 1708 static bool validate_add_rxsc(struct nlattr **attrs) 1709 { 1710 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1711 return false; 1712 1713 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1714 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1715 return false; 1716 } 1717 1718 return true; 1719 } 1720 1721 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1722 { 1723 struct net_device *dev; 1724 sci_t sci = MACSEC_UNDEF_SCI; 1725 struct nlattr **attrs = info->attrs; 1726 struct macsec_rx_sc *rx_sc; 1727 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1728 1729 if (!attrs[MACSEC_ATTR_IFINDEX]) 1730 return -EINVAL; 1731 1732 if (parse_rxsc_config(attrs, tb_rxsc)) 1733 return -EINVAL; 1734 1735 if (!validate_add_rxsc(tb_rxsc)) 1736 return -EINVAL; 1737 1738 rtnl_lock(); 1739 dev = get_dev_from_nl(genl_info_net(info), attrs); 1740 if (IS_ERR(dev)) { 1741 rtnl_unlock(); 1742 return PTR_ERR(dev); 1743 } 1744 1745 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1746 1747 rx_sc = create_rx_sc(dev, sci); 1748 if (IS_ERR(rx_sc)) { 1749 rtnl_unlock(); 1750 return PTR_ERR(rx_sc); 1751 } 1752 1753 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1754 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1755 1756 rtnl_unlock(); 1757 1758 return 0; 1759 } 1760 1761 static bool validate_add_txsa(struct nlattr **attrs) 1762 { 1763 if (!attrs[MACSEC_SA_ATTR_AN] || 1764 !attrs[MACSEC_SA_ATTR_PN] || 1765 !attrs[MACSEC_SA_ATTR_KEY] || 1766 !attrs[MACSEC_SA_ATTR_KEYID]) 1767 return false; 1768 1769 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1770 return false; 1771 1772 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1773 return false; 1774 1775 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1776 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1777 return false; 1778 } 1779 1780 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1781 return false; 1782 1783 return true; 1784 } 1785 1786 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1787 { 1788 struct net_device *dev; 1789 struct nlattr **attrs = info->attrs; 1790 struct macsec_secy *secy; 1791 struct macsec_tx_sc *tx_sc; 1792 struct macsec_tx_sa *tx_sa; 1793 unsigned char assoc_num; 1794 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1795 int err; 1796 1797 if (!attrs[MACSEC_ATTR_IFINDEX]) 1798 return -EINVAL; 1799 1800 if (parse_sa_config(attrs, tb_sa)) 1801 return -EINVAL; 1802 1803 if (!validate_add_txsa(tb_sa)) 1804 return -EINVAL; 1805 1806 rtnl_lock(); 1807 dev = get_dev_from_nl(genl_info_net(info), attrs); 1808 if (IS_ERR(dev)) { 1809 rtnl_unlock(); 1810 return PTR_ERR(dev); 1811 } 1812 1813 secy = &macsec_priv(dev)->secy; 1814 tx_sc = &secy->tx_sc; 1815 1816 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1817 1818 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1819 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 1820 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1821 rtnl_unlock(); 1822 return -EINVAL; 1823 } 1824 1825 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 1826 if (tx_sa) { 1827 rtnl_unlock(); 1828 return -EBUSY; 1829 } 1830 1831 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 1832 if (!tx_sa) { 1833 rtnl_unlock(); 1834 return -ENOMEM; 1835 } 1836 1837 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1838 secy->key_len, secy->icv_len); 1839 if (err < 0) { 1840 kfree(tx_sa); 1841 rtnl_unlock(); 1842 return err; 1843 } 1844 1845 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1846 1847 spin_lock_bh(&tx_sa->lock); 1848 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1849 spin_unlock_bh(&tx_sa->lock); 1850 1851 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1852 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1853 1854 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 1855 secy->operational = true; 1856 1857 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 1858 1859 rtnl_unlock(); 1860 1861 return 0; 1862 } 1863 1864 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 1865 { 1866 struct nlattr **attrs = info->attrs; 1867 struct net_device *dev; 1868 struct macsec_secy *secy; 1869 struct macsec_rx_sc *rx_sc; 1870 struct macsec_rx_sa *rx_sa; 1871 u8 assoc_num; 1872 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1873 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1874 1875 if (!attrs[MACSEC_ATTR_IFINDEX]) 1876 return -EINVAL; 1877 1878 if (parse_sa_config(attrs, tb_sa)) 1879 return -EINVAL; 1880 1881 if (parse_rxsc_config(attrs, tb_rxsc)) 1882 return -EINVAL; 1883 1884 rtnl_lock(); 1885 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 1886 &dev, &secy, &rx_sc, &assoc_num); 1887 if (IS_ERR(rx_sa)) { 1888 rtnl_unlock(); 1889 return PTR_ERR(rx_sa); 1890 } 1891 1892 if (rx_sa->active) { 1893 rtnl_unlock(); 1894 return -EBUSY; 1895 } 1896 1897 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 1898 clear_rx_sa(rx_sa); 1899 1900 rtnl_unlock(); 1901 1902 return 0; 1903 } 1904 1905 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 1906 { 1907 struct nlattr **attrs = info->attrs; 1908 struct net_device *dev; 1909 struct macsec_secy *secy; 1910 struct macsec_rx_sc *rx_sc; 1911 sci_t sci; 1912 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1913 1914 if (!attrs[MACSEC_ATTR_IFINDEX]) 1915 return -EINVAL; 1916 1917 if (parse_rxsc_config(attrs, tb_rxsc)) 1918 return -EINVAL; 1919 1920 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1921 return -EINVAL; 1922 1923 rtnl_lock(); 1924 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 1925 if (IS_ERR(dev)) { 1926 rtnl_unlock(); 1927 return PTR_ERR(dev); 1928 } 1929 1930 secy = &macsec_priv(dev)->secy; 1931 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1932 1933 rx_sc = del_rx_sc(secy, sci); 1934 if (!rx_sc) { 1935 rtnl_unlock(); 1936 return -ENODEV; 1937 } 1938 1939 free_rx_sc(rx_sc); 1940 rtnl_unlock(); 1941 1942 return 0; 1943 } 1944 1945 static int macsec_del_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 rtnl_lock(); 1962 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 1963 &dev, &secy, &tx_sc, &assoc_num); 1964 if (IS_ERR(tx_sa)) { 1965 rtnl_unlock(); 1966 return PTR_ERR(tx_sa); 1967 } 1968 1969 if (tx_sa->active) { 1970 rtnl_unlock(); 1971 return -EBUSY; 1972 } 1973 1974 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 1975 clear_tx_sa(tx_sa); 1976 1977 rtnl_unlock(); 1978 1979 return 0; 1980 } 1981 1982 static bool validate_upd_sa(struct nlattr **attrs) 1983 { 1984 if (!attrs[MACSEC_SA_ATTR_AN] || 1985 attrs[MACSEC_SA_ATTR_KEY] || 1986 attrs[MACSEC_SA_ATTR_KEYID]) 1987 return false; 1988 1989 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1990 return false; 1991 1992 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1993 return false; 1994 1995 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1996 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1997 return false; 1998 } 1999 2000 return true; 2001 } 2002 2003 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2004 { 2005 struct nlattr **attrs = info->attrs; 2006 struct net_device *dev; 2007 struct macsec_secy *secy; 2008 struct macsec_tx_sc *tx_sc; 2009 struct macsec_tx_sa *tx_sa; 2010 u8 assoc_num; 2011 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2012 2013 if (!attrs[MACSEC_ATTR_IFINDEX]) 2014 return -EINVAL; 2015 2016 if (parse_sa_config(attrs, tb_sa)) 2017 return -EINVAL; 2018 2019 if (!validate_upd_sa(tb_sa)) 2020 return -EINVAL; 2021 2022 rtnl_lock(); 2023 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2024 &dev, &secy, &tx_sc, &assoc_num); 2025 if (IS_ERR(tx_sa)) { 2026 rtnl_unlock(); 2027 return PTR_ERR(tx_sa); 2028 } 2029 2030 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2031 spin_lock_bh(&tx_sa->lock); 2032 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 2033 spin_unlock_bh(&tx_sa->lock); 2034 } 2035 2036 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2037 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2038 2039 if (assoc_num == tx_sc->encoding_sa) 2040 secy->operational = tx_sa->active; 2041 2042 rtnl_unlock(); 2043 2044 return 0; 2045 } 2046 2047 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2048 { 2049 struct nlattr **attrs = info->attrs; 2050 struct net_device *dev; 2051 struct macsec_secy *secy; 2052 struct macsec_rx_sc *rx_sc; 2053 struct macsec_rx_sa *rx_sa; 2054 u8 assoc_num; 2055 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2056 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2057 2058 if (!attrs[MACSEC_ATTR_IFINDEX]) 2059 return -EINVAL; 2060 2061 if (parse_rxsc_config(attrs, tb_rxsc)) 2062 return -EINVAL; 2063 2064 if (parse_sa_config(attrs, tb_sa)) 2065 return -EINVAL; 2066 2067 if (!validate_upd_sa(tb_sa)) 2068 return -EINVAL; 2069 2070 rtnl_lock(); 2071 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2072 &dev, &secy, &rx_sc, &assoc_num); 2073 if (IS_ERR(rx_sa)) { 2074 rtnl_unlock(); 2075 return PTR_ERR(rx_sa); 2076 } 2077 2078 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2079 spin_lock_bh(&rx_sa->lock); 2080 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 2081 spin_unlock_bh(&rx_sa->lock); 2082 } 2083 2084 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2085 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2086 2087 rtnl_unlock(); 2088 return 0; 2089 } 2090 2091 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2092 { 2093 struct nlattr **attrs = info->attrs; 2094 struct net_device *dev; 2095 struct macsec_secy *secy; 2096 struct macsec_rx_sc *rx_sc; 2097 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2098 2099 if (!attrs[MACSEC_ATTR_IFINDEX]) 2100 return -EINVAL; 2101 2102 if (parse_rxsc_config(attrs, tb_rxsc)) 2103 return -EINVAL; 2104 2105 if (!validate_add_rxsc(tb_rxsc)) 2106 return -EINVAL; 2107 2108 rtnl_lock(); 2109 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2110 if (IS_ERR(rx_sc)) { 2111 rtnl_unlock(); 2112 return PTR_ERR(rx_sc); 2113 } 2114 2115 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2116 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2117 2118 if (rx_sc->active != new) 2119 secy->n_rx_sc += new ? 1 : -1; 2120 2121 rx_sc->active = new; 2122 } 2123 2124 rtnl_unlock(); 2125 2126 return 0; 2127 } 2128 2129 static int copy_tx_sa_stats(struct sk_buff *skb, 2130 struct macsec_tx_sa_stats __percpu *pstats) 2131 { 2132 struct macsec_tx_sa_stats sum = {0, }; 2133 int cpu; 2134 2135 for_each_possible_cpu(cpu) { 2136 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2137 2138 sum.OutPktsProtected += stats->OutPktsProtected; 2139 sum.OutPktsEncrypted += stats->OutPktsEncrypted; 2140 } 2141 2142 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) || 2143 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted)) 2144 return -EMSGSIZE; 2145 2146 return 0; 2147 } 2148 2149 static int copy_rx_sa_stats(struct sk_buff *skb, 2150 struct macsec_rx_sa_stats __percpu *pstats) 2151 { 2152 struct macsec_rx_sa_stats sum = {0, }; 2153 int cpu; 2154 2155 for_each_possible_cpu(cpu) { 2156 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2157 2158 sum.InPktsOK += stats->InPktsOK; 2159 sum.InPktsInvalid += stats->InPktsInvalid; 2160 sum.InPktsNotValid += stats->InPktsNotValid; 2161 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA; 2162 sum.InPktsUnusedSA += stats->InPktsUnusedSA; 2163 } 2164 2165 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) || 2166 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) || 2167 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) || 2168 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) || 2169 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA)) 2170 return -EMSGSIZE; 2171 2172 return 0; 2173 } 2174 2175 static int copy_rx_sc_stats(struct sk_buff *skb, 2176 struct pcpu_rx_sc_stats __percpu *pstats) 2177 { 2178 struct macsec_rx_sc_stats sum = {0, }; 2179 int cpu; 2180 2181 for_each_possible_cpu(cpu) { 2182 const struct pcpu_rx_sc_stats *stats; 2183 struct macsec_rx_sc_stats tmp; 2184 unsigned int start; 2185 2186 stats = per_cpu_ptr(pstats, cpu); 2187 do { 2188 start = u64_stats_fetch_begin_irq(&stats->syncp); 2189 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2190 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2191 2192 sum.InOctetsValidated += tmp.InOctetsValidated; 2193 sum.InOctetsDecrypted += tmp.InOctetsDecrypted; 2194 sum.InPktsUnchecked += tmp.InPktsUnchecked; 2195 sum.InPktsDelayed += tmp.InPktsDelayed; 2196 sum.InPktsOK += tmp.InPktsOK; 2197 sum.InPktsInvalid += tmp.InPktsInvalid; 2198 sum.InPktsLate += tmp.InPktsLate; 2199 sum.InPktsNotValid += tmp.InPktsNotValid; 2200 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2201 sum.InPktsUnusedSA += tmp.InPktsUnusedSA; 2202 } 2203 2204 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2205 sum.InOctetsValidated, 2206 MACSEC_RXSC_STATS_ATTR_PAD) || 2207 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2208 sum.InOctetsDecrypted, 2209 MACSEC_RXSC_STATS_ATTR_PAD) || 2210 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2211 sum.InPktsUnchecked, 2212 MACSEC_RXSC_STATS_ATTR_PAD) || 2213 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2214 sum.InPktsDelayed, 2215 MACSEC_RXSC_STATS_ATTR_PAD) || 2216 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2217 sum.InPktsOK, 2218 MACSEC_RXSC_STATS_ATTR_PAD) || 2219 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2220 sum.InPktsInvalid, 2221 MACSEC_RXSC_STATS_ATTR_PAD) || 2222 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2223 sum.InPktsLate, 2224 MACSEC_RXSC_STATS_ATTR_PAD) || 2225 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2226 sum.InPktsNotValid, 2227 MACSEC_RXSC_STATS_ATTR_PAD) || 2228 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2229 sum.InPktsNotUsingSA, 2230 MACSEC_RXSC_STATS_ATTR_PAD) || 2231 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2232 sum.InPktsUnusedSA, 2233 MACSEC_RXSC_STATS_ATTR_PAD)) 2234 return -EMSGSIZE; 2235 2236 return 0; 2237 } 2238 2239 static int copy_tx_sc_stats(struct sk_buff *skb, 2240 struct pcpu_tx_sc_stats __percpu *pstats) 2241 { 2242 struct macsec_tx_sc_stats sum = {0, }; 2243 int cpu; 2244 2245 for_each_possible_cpu(cpu) { 2246 const struct pcpu_tx_sc_stats *stats; 2247 struct macsec_tx_sc_stats tmp; 2248 unsigned int start; 2249 2250 stats = per_cpu_ptr(pstats, cpu); 2251 do { 2252 start = u64_stats_fetch_begin_irq(&stats->syncp); 2253 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2254 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2255 2256 sum.OutPktsProtected += tmp.OutPktsProtected; 2257 sum.OutPktsEncrypted += tmp.OutPktsEncrypted; 2258 sum.OutOctetsProtected += tmp.OutOctetsProtected; 2259 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2260 } 2261 2262 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2263 sum.OutPktsProtected, 2264 MACSEC_TXSC_STATS_ATTR_PAD) || 2265 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2266 sum.OutPktsEncrypted, 2267 MACSEC_TXSC_STATS_ATTR_PAD) || 2268 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2269 sum.OutOctetsProtected, 2270 MACSEC_TXSC_STATS_ATTR_PAD) || 2271 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2272 sum.OutOctetsEncrypted, 2273 MACSEC_TXSC_STATS_ATTR_PAD)) 2274 return -EMSGSIZE; 2275 2276 return 0; 2277 } 2278 2279 static int copy_secy_stats(struct sk_buff *skb, 2280 struct pcpu_secy_stats __percpu *pstats) 2281 { 2282 struct macsec_dev_stats sum = {0, }; 2283 int cpu; 2284 2285 for_each_possible_cpu(cpu) { 2286 const struct pcpu_secy_stats *stats; 2287 struct macsec_dev_stats tmp; 2288 unsigned int start; 2289 2290 stats = per_cpu_ptr(pstats, cpu); 2291 do { 2292 start = u64_stats_fetch_begin_irq(&stats->syncp); 2293 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2294 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2295 2296 sum.OutPktsUntagged += tmp.OutPktsUntagged; 2297 sum.InPktsUntagged += tmp.InPktsUntagged; 2298 sum.OutPktsTooLong += tmp.OutPktsTooLong; 2299 sum.InPktsNoTag += tmp.InPktsNoTag; 2300 sum.InPktsBadTag += tmp.InPktsBadTag; 2301 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2302 sum.InPktsNoSCI += tmp.InPktsNoSCI; 2303 sum.InPktsOverrun += tmp.InPktsOverrun; 2304 } 2305 2306 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 2307 sum.OutPktsUntagged, 2308 MACSEC_SECY_STATS_ATTR_PAD) || 2309 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 2310 sum.InPktsUntagged, 2311 MACSEC_SECY_STATS_ATTR_PAD) || 2312 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 2313 sum.OutPktsTooLong, 2314 MACSEC_SECY_STATS_ATTR_PAD) || 2315 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 2316 sum.InPktsNoTag, 2317 MACSEC_SECY_STATS_ATTR_PAD) || 2318 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 2319 sum.InPktsBadTag, 2320 MACSEC_SECY_STATS_ATTR_PAD) || 2321 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 2322 sum.InPktsUnknownSCI, 2323 MACSEC_SECY_STATS_ATTR_PAD) || 2324 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 2325 sum.InPktsNoSCI, 2326 MACSEC_SECY_STATS_ATTR_PAD) || 2327 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 2328 sum.InPktsOverrun, 2329 MACSEC_SECY_STATS_ATTR_PAD)) 2330 return -EMSGSIZE; 2331 2332 return 0; 2333 } 2334 2335 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 2336 { 2337 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2338 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY); 2339 2340 if (!secy_nest) 2341 return 1; 2342 2343 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 2344 MACSEC_SECY_ATTR_PAD) || 2345 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 2346 MACSEC_DEFAULT_CIPHER_ID, 2347 MACSEC_SECY_ATTR_PAD) || 2348 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 2349 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 2350 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 2351 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 2352 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 2353 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 2354 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 2355 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 2356 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 2357 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 2358 goto cancel; 2359 2360 if (secy->replay_protect) { 2361 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 2362 goto cancel; 2363 } 2364 2365 nla_nest_end(skb, secy_nest); 2366 return 0; 2367 2368 cancel: 2369 nla_nest_cancel(skb, secy_nest); 2370 return 1; 2371 } 2372 2373 static int dump_secy(struct macsec_secy *secy, struct net_device *dev, 2374 struct sk_buff *skb, struct netlink_callback *cb) 2375 { 2376 struct macsec_rx_sc *rx_sc; 2377 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2378 struct nlattr *txsa_list, *rxsc_list; 2379 int i, j; 2380 void *hdr; 2381 struct nlattr *attr; 2382 2383 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 2384 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 2385 if (!hdr) 2386 return -EMSGSIZE; 2387 2388 genl_dump_check_consistent(cb, hdr, &macsec_fam); 2389 2390 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 2391 goto nla_put_failure; 2392 2393 if (nla_put_secy(secy, skb)) 2394 goto nla_put_failure; 2395 2396 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS); 2397 if (!attr) 2398 goto nla_put_failure; 2399 if (copy_tx_sc_stats(skb, tx_sc->stats)) { 2400 nla_nest_cancel(skb, attr); 2401 goto nla_put_failure; 2402 } 2403 nla_nest_end(skb, attr); 2404 2405 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS); 2406 if (!attr) 2407 goto nla_put_failure; 2408 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) { 2409 nla_nest_cancel(skb, attr); 2410 goto nla_put_failure; 2411 } 2412 nla_nest_end(skb, attr); 2413 2414 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST); 2415 if (!txsa_list) 2416 goto nla_put_failure; 2417 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 2418 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 2419 struct nlattr *txsa_nest; 2420 2421 if (!tx_sa) 2422 continue; 2423 2424 txsa_nest = nla_nest_start(skb, j++); 2425 if (!txsa_nest) { 2426 nla_nest_cancel(skb, txsa_list); 2427 goto nla_put_failure; 2428 } 2429 2430 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2431 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) || 2432 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 2433 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 2434 nla_nest_cancel(skb, txsa_nest); 2435 nla_nest_cancel(skb, txsa_list); 2436 goto nla_put_failure; 2437 } 2438 2439 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS); 2440 if (!attr) { 2441 nla_nest_cancel(skb, txsa_nest); 2442 nla_nest_cancel(skb, txsa_list); 2443 goto nla_put_failure; 2444 } 2445 if (copy_tx_sa_stats(skb, tx_sa->stats)) { 2446 nla_nest_cancel(skb, attr); 2447 nla_nest_cancel(skb, txsa_nest); 2448 nla_nest_cancel(skb, txsa_list); 2449 goto nla_put_failure; 2450 } 2451 nla_nest_end(skb, attr); 2452 2453 nla_nest_end(skb, txsa_nest); 2454 } 2455 nla_nest_end(skb, txsa_list); 2456 2457 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST); 2458 if (!rxsc_list) 2459 goto nla_put_failure; 2460 2461 j = 1; 2462 for_each_rxsc_rtnl(secy, rx_sc) { 2463 int k; 2464 struct nlattr *rxsa_list; 2465 struct nlattr *rxsc_nest = nla_nest_start(skb, j++); 2466 2467 if (!rxsc_nest) { 2468 nla_nest_cancel(skb, rxsc_list); 2469 goto nla_put_failure; 2470 } 2471 2472 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 2473 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 2474 MACSEC_RXSC_ATTR_PAD)) { 2475 nla_nest_cancel(skb, rxsc_nest); 2476 nla_nest_cancel(skb, rxsc_list); 2477 goto nla_put_failure; 2478 } 2479 2480 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS); 2481 if (!attr) { 2482 nla_nest_cancel(skb, rxsc_nest); 2483 nla_nest_cancel(skb, rxsc_list); 2484 goto nla_put_failure; 2485 } 2486 if (copy_rx_sc_stats(skb, rx_sc->stats)) { 2487 nla_nest_cancel(skb, attr); 2488 nla_nest_cancel(skb, rxsc_nest); 2489 nla_nest_cancel(skb, rxsc_list); 2490 goto nla_put_failure; 2491 } 2492 nla_nest_end(skb, attr); 2493 2494 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST); 2495 if (!rxsa_list) { 2496 nla_nest_cancel(skb, rxsc_nest); 2497 nla_nest_cancel(skb, rxsc_list); 2498 goto nla_put_failure; 2499 } 2500 2501 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 2502 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 2503 struct nlattr *rxsa_nest; 2504 2505 if (!rx_sa) 2506 continue; 2507 2508 rxsa_nest = nla_nest_start(skb, k++); 2509 if (!rxsa_nest) { 2510 nla_nest_cancel(skb, rxsa_list); 2511 nla_nest_cancel(skb, rxsc_nest); 2512 nla_nest_cancel(skb, rxsc_list); 2513 goto nla_put_failure; 2514 } 2515 2516 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS); 2517 if (!attr) { 2518 nla_nest_cancel(skb, rxsa_list); 2519 nla_nest_cancel(skb, rxsc_nest); 2520 nla_nest_cancel(skb, rxsc_list); 2521 goto nla_put_failure; 2522 } 2523 if (copy_rx_sa_stats(skb, rx_sa->stats)) { 2524 nla_nest_cancel(skb, attr); 2525 nla_nest_cancel(skb, rxsa_list); 2526 nla_nest_cancel(skb, rxsc_nest); 2527 nla_nest_cancel(skb, rxsc_list); 2528 goto nla_put_failure; 2529 } 2530 nla_nest_end(skb, attr); 2531 2532 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2533 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) || 2534 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 2535 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 2536 nla_nest_cancel(skb, rxsa_nest); 2537 nla_nest_cancel(skb, rxsc_nest); 2538 nla_nest_cancel(skb, rxsc_list); 2539 goto nla_put_failure; 2540 } 2541 nla_nest_end(skb, rxsa_nest); 2542 } 2543 2544 nla_nest_end(skb, rxsa_list); 2545 nla_nest_end(skb, rxsc_nest); 2546 } 2547 2548 nla_nest_end(skb, rxsc_list); 2549 2550 genlmsg_end(skb, hdr); 2551 2552 return 0; 2553 2554 nla_put_failure: 2555 genlmsg_cancel(skb, hdr); 2556 return -EMSGSIZE; 2557 } 2558 2559 static int macsec_generation = 1; /* protected by RTNL */ 2560 2561 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 2562 { 2563 struct net *net = sock_net(skb->sk); 2564 struct net_device *dev; 2565 int dev_idx, d; 2566 2567 dev_idx = cb->args[0]; 2568 2569 d = 0; 2570 rtnl_lock(); 2571 2572 cb->seq = macsec_generation; 2573 2574 for_each_netdev(net, dev) { 2575 struct macsec_secy *secy; 2576 2577 if (d < dev_idx) 2578 goto next; 2579 2580 if (!netif_is_macsec(dev)) 2581 goto next; 2582 2583 secy = &macsec_priv(dev)->secy; 2584 if (dump_secy(secy, dev, skb, cb) < 0) 2585 goto done; 2586 next: 2587 d++; 2588 } 2589 2590 done: 2591 rtnl_unlock(); 2592 cb->args[0] = d; 2593 return skb->len; 2594 } 2595 2596 static const struct genl_ops macsec_genl_ops[] = { 2597 { 2598 .cmd = MACSEC_CMD_GET_TXSC, 2599 .dumpit = macsec_dump_txsc, 2600 .policy = macsec_genl_policy, 2601 }, 2602 { 2603 .cmd = MACSEC_CMD_ADD_RXSC, 2604 .doit = macsec_add_rxsc, 2605 .policy = macsec_genl_policy, 2606 .flags = GENL_ADMIN_PERM, 2607 }, 2608 { 2609 .cmd = MACSEC_CMD_DEL_RXSC, 2610 .doit = macsec_del_rxsc, 2611 .policy = macsec_genl_policy, 2612 .flags = GENL_ADMIN_PERM, 2613 }, 2614 { 2615 .cmd = MACSEC_CMD_UPD_RXSC, 2616 .doit = macsec_upd_rxsc, 2617 .policy = macsec_genl_policy, 2618 .flags = GENL_ADMIN_PERM, 2619 }, 2620 { 2621 .cmd = MACSEC_CMD_ADD_TXSA, 2622 .doit = macsec_add_txsa, 2623 .policy = macsec_genl_policy, 2624 .flags = GENL_ADMIN_PERM, 2625 }, 2626 { 2627 .cmd = MACSEC_CMD_DEL_TXSA, 2628 .doit = macsec_del_txsa, 2629 .policy = macsec_genl_policy, 2630 .flags = GENL_ADMIN_PERM, 2631 }, 2632 { 2633 .cmd = MACSEC_CMD_UPD_TXSA, 2634 .doit = macsec_upd_txsa, 2635 .policy = macsec_genl_policy, 2636 .flags = GENL_ADMIN_PERM, 2637 }, 2638 { 2639 .cmd = MACSEC_CMD_ADD_RXSA, 2640 .doit = macsec_add_rxsa, 2641 .policy = macsec_genl_policy, 2642 .flags = GENL_ADMIN_PERM, 2643 }, 2644 { 2645 .cmd = MACSEC_CMD_DEL_RXSA, 2646 .doit = macsec_del_rxsa, 2647 .policy = macsec_genl_policy, 2648 .flags = GENL_ADMIN_PERM, 2649 }, 2650 { 2651 .cmd = MACSEC_CMD_UPD_RXSA, 2652 .doit = macsec_upd_rxsa, 2653 .policy = macsec_genl_policy, 2654 .flags = GENL_ADMIN_PERM, 2655 }, 2656 }; 2657 2658 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 2659 struct net_device *dev) 2660 { 2661 struct macsec_dev *macsec = netdev_priv(dev); 2662 struct macsec_secy *secy = &macsec->secy; 2663 struct pcpu_secy_stats *secy_stats; 2664 int ret, len; 2665 2666 /* 10.5 */ 2667 if (!secy->protect_frames) { 2668 secy_stats = this_cpu_ptr(macsec->stats); 2669 u64_stats_update_begin(&secy_stats->syncp); 2670 secy_stats->stats.OutPktsUntagged++; 2671 u64_stats_update_end(&secy_stats->syncp); 2672 skb->dev = macsec->real_dev; 2673 len = skb->len; 2674 ret = dev_queue_xmit(skb); 2675 count_tx(dev, ret, len); 2676 return ret; 2677 } 2678 2679 if (!secy->operational) { 2680 kfree_skb(skb); 2681 dev->stats.tx_dropped++; 2682 return NETDEV_TX_OK; 2683 } 2684 2685 skb = macsec_encrypt(skb, dev); 2686 if (IS_ERR(skb)) { 2687 if (PTR_ERR(skb) != -EINPROGRESS) 2688 dev->stats.tx_dropped++; 2689 return NETDEV_TX_OK; 2690 } 2691 2692 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 2693 2694 macsec_encrypt_finish(skb, dev); 2695 len = skb->len; 2696 ret = dev_queue_xmit(skb); 2697 count_tx(dev, ret, len); 2698 return ret; 2699 } 2700 2701 #define MACSEC_FEATURES \ 2702 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 2703 static struct lock_class_key macsec_netdev_addr_lock_key; 2704 2705 static int macsec_dev_init(struct net_device *dev) 2706 { 2707 struct macsec_dev *macsec = macsec_priv(dev); 2708 struct net_device *real_dev = macsec->real_dev; 2709 int err; 2710 2711 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2712 if (!dev->tstats) 2713 return -ENOMEM; 2714 2715 err = gro_cells_init(&macsec->gro_cells, dev); 2716 if (err) { 2717 free_percpu(dev->tstats); 2718 return err; 2719 } 2720 2721 dev->features = real_dev->features & MACSEC_FEATURES; 2722 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 2723 2724 dev->needed_headroom = real_dev->needed_headroom + 2725 MACSEC_NEEDED_HEADROOM; 2726 dev->needed_tailroom = real_dev->needed_tailroom + 2727 MACSEC_NEEDED_TAILROOM; 2728 2729 if (is_zero_ether_addr(dev->dev_addr)) 2730 eth_hw_addr_inherit(dev, real_dev); 2731 if (is_zero_ether_addr(dev->broadcast)) 2732 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 2733 2734 return 0; 2735 } 2736 2737 static void macsec_dev_uninit(struct net_device *dev) 2738 { 2739 struct macsec_dev *macsec = macsec_priv(dev); 2740 2741 gro_cells_destroy(&macsec->gro_cells); 2742 free_percpu(dev->tstats); 2743 } 2744 2745 static netdev_features_t macsec_fix_features(struct net_device *dev, 2746 netdev_features_t features) 2747 { 2748 struct macsec_dev *macsec = macsec_priv(dev); 2749 struct net_device *real_dev = macsec->real_dev; 2750 2751 features &= (real_dev->features & MACSEC_FEATURES) | 2752 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 2753 features |= NETIF_F_LLTX; 2754 2755 return features; 2756 } 2757 2758 static int macsec_dev_open(struct net_device *dev) 2759 { 2760 struct macsec_dev *macsec = macsec_priv(dev); 2761 struct net_device *real_dev = macsec->real_dev; 2762 int err; 2763 2764 if (!(real_dev->flags & IFF_UP)) 2765 return -ENETDOWN; 2766 2767 err = dev_uc_add(real_dev, dev->dev_addr); 2768 if (err < 0) 2769 return err; 2770 2771 if (dev->flags & IFF_ALLMULTI) { 2772 err = dev_set_allmulti(real_dev, 1); 2773 if (err < 0) 2774 goto del_unicast; 2775 } 2776 2777 if (dev->flags & IFF_PROMISC) { 2778 err = dev_set_promiscuity(real_dev, 1); 2779 if (err < 0) 2780 goto clear_allmulti; 2781 } 2782 2783 if (netif_carrier_ok(real_dev)) 2784 netif_carrier_on(dev); 2785 2786 return 0; 2787 clear_allmulti: 2788 if (dev->flags & IFF_ALLMULTI) 2789 dev_set_allmulti(real_dev, -1); 2790 del_unicast: 2791 dev_uc_del(real_dev, dev->dev_addr); 2792 netif_carrier_off(dev); 2793 return err; 2794 } 2795 2796 static int macsec_dev_stop(struct net_device *dev) 2797 { 2798 struct macsec_dev *macsec = macsec_priv(dev); 2799 struct net_device *real_dev = macsec->real_dev; 2800 2801 netif_carrier_off(dev); 2802 2803 dev_mc_unsync(real_dev, dev); 2804 dev_uc_unsync(real_dev, dev); 2805 2806 if (dev->flags & IFF_ALLMULTI) 2807 dev_set_allmulti(real_dev, -1); 2808 2809 if (dev->flags & IFF_PROMISC) 2810 dev_set_promiscuity(real_dev, -1); 2811 2812 dev_uc_del(real_dev, dev->dev_addr); 2813 2814 return 0; 2815 } 2816 2817 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 2818 { 2819 struct net_device *real_dev = macsec_priv(dev)->real_dev; 2820 2821 if (!(dev->flags & IFF_UP)) 2822 return; 2823 2824 if (change & IFF_ALLMULTI) 2825 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 2826 2827 if (change & IFF_PROMISC) 2828 dev_set_promiscuity(real_dev, 2829 dev->flags & IFF_PROMISC ? 1 : -1); 2830 } 2831 2832 static void macsec_dev_set_rx_mode(struct net_device *dev) 2833 { 2834 struct net_device *real_dev = macsec_priv(dev)->real_dev; 2835 2836 dev_mc_sync(real_dev, dev); 2837 dev_uc_sync(real_dev, dev); 2838 } 2839 2840 static int macsec_set_mac_address(struct net_device *dev, void *p) 2841 { 2842 struct macsec_dev *macsec = macsec_priv(dev); 2843 struct net_device *real_dev = macsec->real_dev; 2844 struct sockaddr *addr = p; 2845 int err; 2846 2847 if (!is_valid_ether_addr(addr->sa_data)) 2848 return -EADDRNOTAVAIL; 2849 2850 if (!(dev->flags & IFF_UP)) 2851 goto out; 2852 2853 err = dev_uc_add(real_dev, addr->sa_data); 2854 if (err < 0) 2855 return err; 2856 2857 dev_uc_del(real_dev, dev->dev_addr); 2858 2859 out: 2860 ether_addr_copy(dev->dev_addr, addr->sa_data); 2861 return 0; 2862 } 2863 2864 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 2865 { 2866 struct macsec_dev *macsec = macsec_priv(dev); 2867 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 2868 2869 if (macsec->real_dev->mtu - extra < new_mtu) 2870 return -ERANGE; 2871 2872 dev->mtu = new_mtu; 2873 2874 return 0; 2875 } 2876 2877 static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev, 2878 struct rtnl_link_stats64 *s) 2879 { 2880 int cpu; 2881 2882 if (!dev->tstats) 2883 return s; 2884 2885 for_each_possible_cpu(cpu) { 2886 struct pcpu_sw_netstats *stats; 2887 struct pcpu_sw_netstats tmp; 2888 int start; 2889 2890 stats = per_cpu_ptr(dev->tstats, cpu); 2891 do { 2892 start = u64_stats_fetch_begin_irq(&stats->syncp); 2893 tmp.rx_packets = stats->rx_packets; 2894 tmp.rx_bytes = stats->rx_bytes; 2895 tmp.tx_packets = stats->tx_packets; 2896 tmp.tx_bytes = stats->tx_bytes; 2897 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2898 2899 s->rx_packets += tmp.rx_packets; 2900 s->rx_bytes += tmp.rx_bytes; 2901 s->tx_packets += tmp.tx_packets; 2902 s->tx_bytes += tmp.tx_bytes; 2903 } 2904 2905 s->rx_dropped = dev->stats.rx_dropped; 2906 s->tx_dropped = dev->stats.tx_dropped; 2907 2908 return s; 2909 } 2910 2911 static int macsec_get_iflink(const struct net_device *dev) 2912 { 2913 return macsec_priv(dev)->real_dev->ifindex; 2914 } 2915 2916 2917 static int macsec_get_nest_level(struct net_device *dev) 2918 { 2919 return macsec_priv(dev)->nest_level; 2920 } 2921 2922 2923 static const struct net_device_ops macsec_netdev_ops = { 2924 .ndo_init = macsec_dev_init, 2925 .ndo_uninit = macsec_dev_uninit, 2926 .ndo_open = macsec_dev_open, 2927 .ndo_stop = macsec_dev_stop, 2928 .ndo_fix_features = macsec_fix_features, 2929 .ndo_change_mtu = macsec_change_mtu, 2930 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 2931 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 2932 .ndo_set_mac_address = macsec_set_mac_address, 2933 .ndo_start_xmit = macsec_start_xmit, 2934 .ndo_get_stats64 = macsec_get_stats64, 2935 .ndo_get_iflink = macsec_get_iflink, 2936 .ndo_get_lock_subclass = macsec_get_nest_level, 2937 }; 2938 2939 static const struct device_type macsec_type = { 2940 .name = "macsec", 2941 }; 2942 2943 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 2944 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 2945 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 2946 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 2947 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 2948 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 2949 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 2950 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 2951 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 2952 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 2953 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 2954 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 2955 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 2956 }; 2957 2958 static void macsec_free_netdev(struct net_device *dev) 2959 { 2960 struct macsec_dev *macsec = macsec_priv(dev); 2961 struct net_device *real_dev = macsec->real_dev; 2962 2963 free_percpu(macsec->stats); 2964 free_percpu(macsec->secy.tx_sc.stats); 2965 2966 dev_put(real_dev); 2967 free_netdev(dev); 2968 } 2969 2970 static void macsec_setup(struct net_device *dev) 2971 { 2972 ether_setup(dev); 2973 dev->priv_flags |= IFF_NO_QUEUE; 2974 dev->netdev_ops = &macsec_netdev_ops; 2975 dev->destructor = macsec_free_netdev; 2976 2977 eth_zero_addr(dev->broadcast); 2978 } 2979 2980 static void macsec_changelink_common(struct net_device *dev, 2981 struct nlattr *data[]) 2982 { 2983 struct macsec_secy *secy; 2984 struct macsec_tx_sc *tx_sc; 2985 2986 secy = &macsec_priv(dev)->secy; 2987 tx_sc = &secy->tx_sc; 2988 2989 if (data[IFLA_MACSEC_ENCODING_SA]) { 2990 struct macsec_tx_sa *tx_sa; 2991 2992 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 2993 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 2994 2995 secy->operational = tx_sa && tx_sa->active; 2996 } 2997 2998 if (data[IFLA_MACSEC_WINDOW]) 2999 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3000 3001 if (data[IFLA_MACSEC_ENCRYPT]) 3002 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3003 3004 if (data[IFLA_MACSEC_PROTECT]) 3005 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3006 3007 if (data[IFLA_MACSEC_INC_SCI]) 3008 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3009 3010 if (data[IFLA_MACSEC_ES]) 3011 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3012 3013 if (data[IFLA_MACSEC_SCB]) 3014 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3015 3016 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3017 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3018 3019 if (data[IFLA_MACSEC_VALIDATION]) 3020 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3021 } 3022 3023 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3024 struct nlattr *data[]) 3025 { 3026 if (!data) 3027 return 0; 3028 3029 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3030 data[IFLA_MACSEC_ICV_LEN] || 3031 data[IFLA_MACSEC_SCI] || 3032 data[IFLA_MACSEC_PORT]) 3033 return -EINVAL; 3034 3035 macsec_changelink_common(dev, data); 3036 3037 return 0; 3038 } 3039 3040 static void macsec_del_dev(struct macsec_dev *macsec) 3041 { 3042 int i; 3043 3044 while (macsec->secy.rx_sc) { 3045 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 3046 3047 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 3048 free_rx_sc(rx_sc); 3049 } 3050 3051 for (i = 0; i < MACSEC_NUM_AN; i++) { 3052 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 3053 3054 if (sa) { 3055 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 3056 clear_tx_sa(sa); 3057 } 3058 } 3059 } 3060 3061 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 3062 { 3063 struct macsec_dev *macsec = macsec_priv(dev); 3064 struct net_device *real_dev = macsec->real_dev; 3065 3066 unregister_netdevice_queue(dev, head); 3067 list_del_rcu(&macsec->secys); 3068 macsec_del_dev(macsec); 3069 netdev_upper_dev_unlink(real_dev, dev); 3070 3071 macsec_generation++; 3072 } 3073 3074 static void macsec_dellink(struct net_device *dev, struct list_head *head) 3075 { 3076 struct macsec_dev *macsec = macsec_priv(dev); 3077 struct net_device *real_dev = macsec->real_dev; 3078 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3079 3080 macsec_common_dellink(dev, head); 3081 3082 if (list_empty(&rxd->secys)) { 3083 netdev_rx_handler_unregister(real_dev); 3084 kfree(rxd); 3085 } 3086 } 3087 3088 static int register_macsec_dev(struct net_device *real_dev, 3089 struct net_device *dev) 3090 { 3091 struct macsec_dev *macsec = macsec_priv(dev); 3092 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3093 3094 if (!rxd) { 3095 int err; 3096 3097 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 3098 if (!rxd) 3099 return -ENOMEM; 3100 3101 INIT_LIST_HEAD(&rxd->secys); 3102 3103 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 3104 rxd); 3105 if (err < 0) { 3106 kfree(rxd); 3107 return err; 3108 } 3109 } 3110 3111 list_add_tail_rcu(&macsec->secys, &rxd->secys); 3112 return 0; 3113 } 3114 3115 static bool sci_exists(struct net_device *dev, sci_t sci) 3116 { 3117 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 3118 struct macsec_dev *macsec; 3119 3120 list_for_each_entry(macsec, &rxd->secys, secys) { 3121 if (macsec->secy.sci == sci) 3122 return true; 3123 } 3124 3125 return false; 3126 } 3127 3128 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 3129 { 3130 return make_sci(dev->dev_addr, port); 3131 } 3132 3133 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 3134 { 3135 struct macsec_dev *macsec = macsec_priv(dev); 3136 struct macsec_secy *secy = &macsec->secy; 3137 3138 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 3139 if (!macsec->stats) 3140 return -ENOMEM; 3141 3142 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 3143 if (!secy->tx_sc.stats) { 3144 free_percpu(macsec->stats); 3145 return -ENOMEM; 3146 } 3147 3148 if (sci == MACSEC_UNDEF_SCI) 3149 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3150 3151 secy->netdev = dev; 3152 secy->operational = true; 3153 secy->key_len = DEFAULT_SAK_LEN; 3154 secy->icv_len = icv_len; 3155 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 3156 secy->protect_frames = true; 3157 secy->replay_protect = false; 3158 3159 secy->sci = sci; 3160 secy->tx_sc.active = true; 3161 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 3162 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 3163 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 3164 secy->tx_sc.end_station = false; 3165 secy->tx_sc.scb = false; 3166 3167 return 0; 3168 } 3169 3170 static int macsec_newlink(struct net *net, struct net_device *dev, 3171 struct nlattr *tb[], struct nlattr *data[]) 3172 { 3173 struct macsec_dev *macsec = macsec_priv(dev); 3174 struct net_device *real_dev; 3175 int err; 3176 sci_t sci; 3177 u8 icv_len = DEFAULT_ICV_LEN; 3178 rx_handler_func_t *rx_handler; 3179 3180 if (!tb[IFLA_LINK]) 3181 return -EINVAL; 3182 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 3183 if (!real_dev) 3184 return -ENODEV; 3185 3186 dev->priv_flags |= IFF_MACSEC; 3187 3188 macsec->real_dev = real_dev; 3189 3190 if (data && data[IFLA_MACSEC_ICV_LEN]) 3191 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3192 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 3193 3194 rx_handler = rtnl_dereference(real_dev->rx_handler); 3195 if (rx_handler && rx_handler != macsec_handle_frame) 3196 return -EBUSY; 3197 3198 err = register_netdevice(dev); 3199 if (err < 0) 3200 return err; 3201 3202 dev_hold(real_dev); 3203 3204 macsec->nest_level = dev_get_nest_level(real_dev) + 1; 3205 netdev_lockdep_set_classes(dev); 3206 lockdep_set_class_and_subclass(&dev->addr_list_lock, 3207 &macsec_netdev_addr_lock_key, 3208 macsec_get_nest_level(dev)); 3209 3210 err = netdev_upper_dev_link(real_dev, dev); 3211 if (err < 0) 3212 goto unregister; 3213 3214 /* need to be already registered so that ->init has run and 3215 * the MAC addr is set 3216 */ 3217 if (data && data[IFLA_MACSEC_SCI]) 3218 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 3219 else if (data && data[IFLA_MACSEC_PORT]) 3220 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 3221 else 3222 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3223 3224 if (rx_handler && sci_exists(real_dev, sci)) { 3225 err = -EBUSY; 3226 goto unlink; 3227 } 3228 3229 err = macsec_add_dev(dev, sci, icv_len); 3230 if (err) 3231 goto unlink; 3232 3233 if (data) 3234 macsec_changelink_common(dev, data); 3235 3236 err = register_macsec_dev(real_dev, dev); 3237 if (err < 0) 3238 goto del_dev; 3239 3240 macsec_generation++; 3241 3242 return 0; 3243 3244 del_dev: 3245 macsec_del_dev(macsec); 3246 unlink: 3247 netdev_upper_dev_unlink(real_dev, dev); 3248 unregister: 3249 unregister_netdevice(dev); 3250 return err; 3251 } 3252 3253 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[]) 3254 { 3255 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 3256 u8 icv_len = DEFAULT_ICV_LEN; 3257 int flag; 3258 bool es, scb, sci; 3259 3260 if (!data) 3261 return 0; 3262 3263 if (data[IFLA_MACSEC_CIPHER_SUITE]) 3264 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 3265 3266 if (data[IFLA_MACSEC_ICV_LEN]) { 3267 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3268 if (icv_len != DEFAULT_ICV_LEN) { 3269 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 3270 struct crypto_aead *dummy_tfm; 3271 3272 dummy_tfm = macsec_alloc_tfm(dummy_key, 3273 DEFAULT_SAK_LEN, 3274 icv_len); 3275 if (IS_ERR(dummy_tfm)) 3276 return PTR_ERR(dummy_tfm); 3277 crypto_free_aead(dummy_tfm); 3278 } 3279 } 3280 3281 switch (csid) { 3282 case MACSEC_DEFAULT_CIPHER_ID: 3283 case MACSEC_DEFAULT_CIPHER_ALT: 3284 if (icv_len < MACSEC_MIN_ICV_LEN || 3285 icv_len > MACSEC_STD_ICV_LEN) 3286 return -EINVAL; 3287 break; 3288 default: 3289 return -EINVAL; 3290 } 3291 3292 if (data[IFLA_MACSEC_ENCODING_SA]) { 3293 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 3294 return -EINVAL; 3295 } 3296 3297 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 3298 flag < IFLA_MACSEC_VALIDATION; 3299 flag++) { 3300 if (data[flag]) { 3301 if (nla_get_u8(data[flag]) > 1) 3302 return -EINVAL; 3303 } 3304 } 3305 3306 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 3307 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 3308 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 3309 3310 if ((sci && (scb || es)) || (scb && es)) 3311 return -EINVAL; 3312 3313 if (data[IFLA_MACSEC_VALIDATION] && 3314 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 3315 return -EINVAL; 3316 3317 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 3318 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 3319 !data[IFLA_MACSEC_WINDOW]) 3320 return -EINVAL; 3321 3322 return 0; 3323 } 3324 3325 static struct net *macsec_get_link_net(const struct net_device *dev) 3326 { 3327 return dev_net(macsec_priv(dev)->real_dev); 3328 } 3329 3330 static size_t macsec_get_size(const struct net_device *dev) 3331 { 3332 return 0 + 3333 nla_total_size_64bit(8) + /* SCI */ 3334 nla_total_size(1) + /* ICV_LEN */ 3335 nla_total_size_64bit(8) + /* CIPHER_SUITE */ 3336 nla_total_size(4) + /* WINDOW */ 3337 nla_total_size(1) + /* ENCODING_SA */ 3338 nla_total_size(1) + /* ENCRYPT */ 3339 nla_total_size(1) + /* PROTECT */ 3340 nla_total_size(1) + /* INC_SCI */ 3341 nla_total_size(1) + /* ES */ 3342 nla_total_size(1) + /* SCB */ 3343 nla_total_size(1) + /* REPLAY_PROTECT */ 3344 nla_total_size(1) + /* VALIDATION */ 3345 0; 3346 } 3347 3348 static int macsec_fill_info(struct sk_buff *skb, 3349 const struct net_device *dev) 3350 { 3351 struct macsec_secy *secy = &macsec_priv(dev)->secy; 3352 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3353 3354 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 3355 IFLA_MACSEC_PAD) || 3356 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 3357 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 3358 MACSEC_DEFAULT_CIPHER_ID, IFLA_MACSEC_PAD) || 3359 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 3360 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 3361 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 3362 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 3363 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 3364 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 3365 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 3366 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 3367 0) 3368 goto nla_put_failure; 3369 3370 if (secy->replay_protect) { 3371 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 3372 goto nla_put_failure; 3373 } 3374 3375 return 0; 3376 3377 nla_put_failure: 3378 return -EMSGSIZE; 3379 } 3380 3381 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 3382 .kind = "macsec", 3383 .priv_size = sizeof(struct macsec_dev), 3384 .maxtype = IFLA_MACSEC_MAX, 3385 .policy = macsec_rtnl_policy, 3386 .setup = macsec_setup, 3387 .validate = macsec_validate_attr, 3388 .newlink = macsec_newlink, 3389 .changelink = macsec_changelink, 3390 .dellink = macsec_dellink, 3391 .get_size = macsec_get_size, 3392 .fill_info = macsec_fill_info, 3393 .get_link_net = macsec_get_link_net, 3394 }; 3395 3396 static bool is_macsec_master(struct net_device *dev) 3397 { 3398 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 3399 } 3400 3401 static int macsec_notify(struct notifier_block *this, unsigned long event, 3402 void *ptr) 3403 { 3404 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 3405 LIST_HEAD(head); 3406 3407 if (!is_macsec_master(real_dev)) 3408 return NOTIFY_DONE; 3409 3410 switch (event) { 3411 case NETDEV_UNREGISTER: { 3412 struct macsec_dev *m, *n; 3413 struct macsec_rxh_data *rxd; 3414 3415 rxd = macsec_data_rtnl(real_dev); 3416 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 3417 macsec_common_dellink(m->secy.netdev, &head); 3418 } 3419 3420 netdev_rx_handler_unregister(real_dev); 3421 kfree(rxd); 3422 3423 unregister_netdevice_many(&head); 3424 break; 3425 } 3426 case NETDEV_CHANGEMTU: { 3427 struct macsec_dev *m; 3428 struct macsec_rxh_data *rxd; 3429 3430 rxd = macsec_data_rtnl(real_dev); 3431 list_for_each_entry(m, &rxd->secys, secys) { 3432 struct net_device *dev = m->secy.netdev; 3433 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 3434 macsec_extra_len(true)); 3435 3436 if (dev->mtu > mtu) 3437 dev_set_mtu(dev, mtu); 3438 } 3439 } 3440 } 3441 3442 return NOTIFY_OK; 3443 } 3444 3445 static struct notifier_block macsec_notifier = { 3446 .notifier_call = macsec_notify, 3447 }; 3448 3449 static int __init macsec_init(void) 3450 { 3451 int err; 3452 3453 pr_info("MACsec IEEE 802.1AE\n"); 3454 err = register_netdevice_notifier(&macsec_notifier); 3455 if (err) 3456 return err; 3457 3458 err = rtnl_link_register(&macsec_link_ops); 3459 if (err) 3460 goto notifier; 3461 3462 err = genl_register_family_with_ops(&macsec_fam, macsec_genl_ops); 3463 if (err) 3464 goto rtnl; 3465 3466 return 0; 3467 3468 rtnl: 3469 rtnl_link_unregister(&macsec_link_ops); 3470 notifier: 3471 unregister_netdevice_notifier(&macsec_notifier); 3472 return err; 3473 } 3474 3475 static void __exit macsec_exit(void) 3476 { 3477 genl_unregister_family(&macsec_fam); 3478 rtnl_link_unregister(&macsec_link_ops); 3479 unregister_netdevice_notifier(&macsec_notifier); 3480 rcu_barrier(); 3481 } 3482 3483 module_init(macsec_init); 3484 module_exit(macsec_exit); 3485 3486 MODULE_ALIAS_RTNL_LINK("macsec"); 3487 3488 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 3489 MODULE_LICENSE("GPL v2"); 3490