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 }; 274 275 /** 276 * struct macsec_rxh_data - rx_handler private argument 277 * @secys: linked list of SecY's on this underlying device 278 */ 279 struct macsec_rxh_data { 280 struct list_head secys; 281 }; 282 283 static struct macsec_dev *macsec_priv(const struct net_device *dev) 284 { 285 return (struct macsec_dev *)netdev_priv(dev); 286 } 287 288 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev) 289 { 290 return rcu_dereference_bh(dev->rx_handler_data); 291 } 292 293 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev) 294 { 295 return rtnl_dereference(dev->rx_handler_data); 296 } 297 298 struct macsec_cb { 299 struct aead_request *req; 300 union { 301 struct macsec_tx_sa *tx_sa; 302 struct macsec_rx_sa *rx_sa; 303 }; 304 u8 assoc_num; 305 bool valid; 306 bool has_sci; 307 }; 308 309 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr) 310 { 311 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr); 312 313 if (!sa || !sa->active) 314 return NULL; 315 316 if (!atomic_inc_not_zero(&sa->refcnt)) 317 return NULL; 318 319 return sa; 320 } 321 322 static void free_rx_sc_rcu(struct rcu_head *head) 323 { 324 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head); 325 326 free_percpu(rx_sc->stats); 327 kfree(rx_sc); 328 } 329 330 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc) 331 { 332 return atomic_inc_not_zero(&sc->refcnt) ? sc : NULL; 333 } 334 335 static void macsec_rxsc_put(struct macsec_rx_sc *sc) 336 { 337 if (atomic_dec_and_test(&sc->refcnt)) 338 call_rcu(&sc->rcu_head, free_rx_sc_rcu); 339 } 340 341 static void free_rxsa(struct rcu_head *head) 342 { 343 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu); 344 345 crypto_free_aead(sa->key.tfm); 346 free_percpu(sa->stats); 347 kfree(sa); 348 } 349 350 static void macsec_rxsa_put(struct macsec_rx_sa *sa) 351 { 352 if (atomic_dec_and_test(&sa->refcnt)) 353 call_rcu(&sa->rcu, free_rxsa); 354 } 355 356 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr) 357 { 358 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr); 359 360 if (!sa || !sa->active) 361 return NULL; 362 363 if (!atomic_inc_not_zero(&sa->refcnt)) 364 return NULL; 365 366 return sa; 367 } 368 369 static void free_txsa(struct rcu_head *head) 370 { 371 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu); 372 373 crypto_free_aead(sa->key.tfm); 374 free_percpu(sa->stats); 375 kfree(sa); 376 } 377 378 static void macsec_txsa_put(struct macsec_tx_sa *sa) 379 { 380 if (atomic_dec_and_test(&sa->refcnt)) 381 call_rcu(&sa->rcu, free_txsa); 382 } 383 384 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) 385 { 386 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); 387 return (struct macsec_cb *)skb->cb; 388 } 389 390 #define MACSEC_PORT_ES (htons(0x0001)) 391 #define MACSEC_PORT_SCB (0x0000) 392 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL) 393 394 #define DEFAULT_SAK_LEN 16 395 #define DEFAULT_SEND_SCI true 396 #define DEFAULT_ENCRYPT false 397 #define DEFAULT_ENCODING_SA 0 398 399 static sci_t make_sci(u8 *addr, __be16 port) 400 { 401 sci_t sci; 402 403 memcpy(&sci, addr, ETH_ALEN); 404 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); 405 406 return sci; 407 } 408 409 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present) 410 { 411 sci_t sci; 412 413 if (sci_present) 414 memcpy(&sci, hdr->secure_channel_id, 415 sizeof(hdr->secure_channel_id)); 416 else 417 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); 418 419 return sci; 420 } 421 422 static unsigned int macsec_sectag_len(bool sci_present) 423 { 424 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); 425 } 426 427 static unsigned int macsec_hdr_len(bool sci_present) 428 { 429 return macsec_sectag_len(sci_present) + ETH_HLEN; 430 } 431 432 static unsigned int macsec_extra_len(bool sci_present) 433 { 434 return macsec_sectag_len(sci_present) + sizeof(__be16); 435 } 436 437 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ 438 static void macsec_fill_sectag(struct macsec_eth_header *h, 439 const struct macsec_secy *secy, u32 pn) 440 { 441 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 442 443 memset(&h->tci_an, 0, macsec_sectag_len(tx_sc->send_sci)); 444 h->eth.h_proto = htons(ETH_P_MACSEC); 445 446 if (tx_sc->send_sci || 447 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb)) { 448 h->tci_an |= MACSEC_TCI_SC; 449 memcpy(&h->secure_channel_id, &secy->sci, 450 sizeof(h->secure_channel_id)); 451 } else { 452 if (tx_sc->end_station) 453 h->tci_an |= MACSEC_TCI_ES; 454 if (tx_sc->scb) 455 h->tci_an |= MACSEC_TCI_SCB; 456 } 457 458 h->packet_number = htonl(pn); 459 460 /* with GCM, C/E clear for !encrypt, both set for encrypt */ 461 if (tx_sc->encrypt) 462 h->tci_an |= MACSEC_TCI_CONFID; 463 else if (secy->icv_len != DEFAULT_ICV_LEN) 464 h->tci_an |= MACSEC_TCI_C; 465 466 h->tci_an |= tx_sc->encoding_sa; 467 } 468 469 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) 470 { 471 if (data_len < MIN_NON_SHORT_LEN) 472 h->short_length = data_len; 473 } 474 475 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */ 476 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len) 477 { 478 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; 479 int len = skb->len - 2 * ETH_ALEN; 480 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; 481 482 /* a) It comprises at least 17 octets */ 483 if (skb->len <= 16) 484 return false; 485 486 /* b) MACsec EtherType: already checked */ 487 488 /* c) V bit is clear */ 489 if (h->tci_an & MACSEC_TCI_VERSION) 490 return false; 491 492 /* d) ES or SCB => !SC */ 493 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && 494 (h->tci_an & MACSEC_TCI_SC)) 495 return false; 496 497 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ 498 if (h->unused) 499 return false; 500 501 /* rx.pn != 0 (figure 10-5) */ 502 if (!h->packet_number) 503 return false; 504 505 /* length check, f) g) h) i) */ 506 if (h->short_length) 507 return len == extra_len + h->short_length; 508 return len >= extra_len + MIN_NON_SHORT_LEN; 509 } 510 511 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) 512 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN 513 514 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) 515 { 516 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; 517 518 gcm_iv->sci = sci; 519 gcm_iv->pn = htonl(pn); 520 } 521 522 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) 523 { 524 return (struct macsec_eth_header *)skb_mac_header(skb); 525 } 526 527 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy) 528 { 529 u32 pn; 530 531 spin_lock_bh(&tx_sa->lock); 532 pn = tx_sa->next_pn; 533 534 tx_sa->next_pn++; 535 if (tx_sa->next_pn == 0) { 536 pr_debug("PN wrapped, transitioning to !oper\n"); 537 tx_sa->active = false; 538 if (secy->protect_frames) 539 secy->operational = false; 540 } 541 spin_unlock_bh(&tx_sa->lock); 542 543 return pn; 544 } 545 546 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) 547 { 548 struct macsec_dev *macsec = netdev_priv(dev); 549 550 skb->dev = macsec->real_dev; 551 skb_reset_mac_header(skb); 552 skb->protocol = eth_hdr(skb)->h_proto; 553 } 554 555 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, 556 struct macsec_tx_sa *tx_sa) 557 { 558 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); 559 560 u64_stats_update_begin(&txsc_stats->syncp); 561 if (tx_sc->encrypt) { 562 txsc_stats->stats.OutOctetsEncrypted += skb->len; 563 txsc_stats->stats.OutPktsEncrypted++; 564 this_cpu_inc(tx_sa->stats->OutPktsEncrypted); 565 } else { 566 txsc_stats->stats.OutOctetsProtected += skb->len; 567 txsc_stats->stats.OutPktsProtected++; 568 this_cpu_inc(tx_sa->stats->OutPktsProtected); 569 } 570 u64_stats_update_end(&txsc_stats->syncp); 571 } 572 573 static void count_tx(struct net_device *dev, int ret, int len) 574 { 575 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 576 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 577 578 u64_stats_update_begin(&stats->syncp); 579 stats->tx_packets++; 580 stats->tx_bytes += len; 581 u64_stats_update_end(&stats->syncp); 582 } else { 583 dev->stats.tx_dropped++; 584 } 585 } 586 587 static void macsec_encrypt_done(struct crypto_async_request *base, int err) 588 { 589 struct sk_buff *skb = base->data; 590 struct net_device *dev = skb->dev; 591 struct macsec_dev *macsec = macsec_priv(dev); 592 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 593 int len, ret; 594 595 aead_request_free(macsec_skb_cb(skb)->req); 596 597 rcu_read_lock_bh(); 598 macsec_encrypt_finish(skb, dev); 599 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 600 len = skb->len; 601 ret = dev_queue_xmit(skb); 602 count_tx(dev, ret, len); 603 rcu_read_unlock_bh(); 604 605 macsec_txsa_put(sa); 606 dev_put(dev); 607 } 608 609 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, 610 unsigned char **iv, 611 struct scatterlist **sg) 612 { 613 size_t size, iv_offset, sg_offset; 614 struct aead_request *req; 615 void *tmp; 616 617 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); 618 iv_offset = size; 619 size += GCM_AES_IV_LEN; 620 621 size = ALIGN(size, __alignof__(struct scatterlist)); 622 sg_offset = size; 623 size += sizeof(struct scatterlist) * (MAX_SKB_FRAGS + 1); 624 625 tmp = kmalloc(size, GFP_ATOMIC); 626 if (!tmp) 627 return NULL; 628 629 *iv = (unsigned char *)(tmp + iv_offset); 630 *sg = (struct scatterlist *)(tmp + sg_offset); 631 req = tmp; 632 633 aead_request_set_tfm(req, tfm); 634 635 return req; 636 } 637 638 static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 639 struct net_device *dev) 640 { 641 int ret; 642 struct scatterlist *sg; 643 unsigned char *iv; 644 struct ethhdr *eth; 645 struct macsec_eth_header *hh; 646 size_t unprotected_len; 647 struct aead_request *req; 648 struct macsec_secy *secy; 649 struct macsec_tx_sc *tx_sc; 650 struct macsec_tx_sa *tx_sa; 651 struct macsec_dev *macsec = macsec_priv(dev); 652 u32 pn; 653 654 secy = &macsec->secy; 655 tx_sc = &secy->tx_sc; 656 657 /* 10.5.1 TX SA assignment */ 658 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); 659 if (!tx_sa) { 660 secy->operational = false; 661 kfree_skb(skb); 662 return ERR_PTR(-EINVAL); 663 } 664 665 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || 666 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { 667 struct sk_buff *nskb = skb_copy_expand(skb, 668 MACSEC_NEEDED_HEADROOM, 669 MACSEC_NEEDED_TAILROOM, 670 GFP_ATOMIC); 671 if (likely(nskb)) { 672 consume_skb(skb); 673 skb = nskb; 674 } else { 675 macsec_txsa_put(tx_sa); 676 kfree_skb(skb); 677 return ERR_PTR(-ENOMEM); 678 } 679 } else { 680 skb = skb_unshare(skb, GFP_ATOMIC); 681 if (!skb) { 682 macsec_txsa_put(tx_sa); 683 return ERR_PTR(-ENOMEM); 684 } 685 } 686 687 unprotected_len = skb->len; 688 eth = eth_hdr(skb); 689 hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(tx_sc->send_sci)); 690 memmove(hh, eth, 2 * ETH_ALEN); 691 692 pn = tx_sa_update_pn(tx_sa, secy); 693 if (pn == 0) { 694 macsec_txsa_put(tx_sa); 695 kfree_skb(skb); 696 return ERR_PTR(-ENOLINK); 697 } 698 macsec_fill_sectag(hh, secy, pn); 699 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); 700 701 skb_put(skb, secy->icv_len); 702 703 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { 704 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 705 706 u64_stats_update_begin(&secy_stats->syncp); 707 secy_stats->stats.OutPktsTooLong++; 708 u64_stats_update_end(&secy_stats->syncp); 709 710 macsec_txsa_put(tx_sa); 711 kfree_skb(skb); 712 return ERR_PTR(-EINVAL); 713 } 714 715 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg); 716 if (!req) { 717 macsec_txsa_put(tx_sa); 718 kfree_skb(skb); 719 return ERR_PTR(-ENOMEM); 720 } 721 722 macsec_fill_iv(iv, secy->sci, pn); 723 724 sg_init_table(sg, MAX_SKB_FRAGS + 1); 725 skb_to_sgvec(skb, sg, 0, skb->len); 726 727 if (tx_sc->encrypt) { 728 int len = skb->len - macsec_hdr_len(tx_sc->send_sci) - 729 secy->icv_len; 730 aead_request_set_crypt(req, sg, sg, len, iv); 731 aead_request_set_ad(req, macsec_hdr_len(tx_sc->send_sci)); 732 } else { 733 aead_request_set_crypt(req, sg, sg, 0, iv); 734 aead_request_set_ad(req, skb->len - secy->icv_len); 735 } 736 737 macsec_skb_cb(skb)->req = req; 738 macsec_skb_cb(skb)->tx_sa = tx_sa; 739 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 740 741 dev_hold(skb->dev); 742 ret = crypto_aead_encrypt(req); 743 if (ret == -EINPROGRESS) { 744 return ERR_PTR(ret); 745 } else if (ret != 0) { 746 dev_put(skb->dev); 747 kfree_skb(skb); 748 aead_request_free(req); 749 macsec_txsa_put(tx_sa); 750 return ERR_PTR(-EINVAL); 751 } 752 753 dev_put(skb->dev); 754 aead_request_free(req); 755 macsec_txsa_put(tx_sa); 756 757 return skb; 758 } 759 760 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 761 { 762 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 763 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 764 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 765 u32 lowest_pn = 0; 766 767 spin_lock(&rx_sa->lock); 768 if (rx_sa->next_pn >= secy->replay_window) 769 lowest_pn = rx_sa->next_pn - secy->replay_window; 770 771 /* Now perform replay protection check again 772 * (see IEEE 802.1AE-2006 figure 10-5) 773 */ 774 if (secy->replay_protect && pn < lowest_pn) { 775 spin_unlock(&rx_sa->lock); 776 u64_stats_update_begin(&rxsc_stats->syncp); 777 rxsc_stats->stats.InPktsLate++; 778 u64_stats_update_end(&rxsc_stats->syncp); 779 return false; 780 } 781 782 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 783 u64_stats_update_begin(&rxsc_stats->syncp); 784 if (hdr->tci_an & MACSEC_TCI_E) 785 rxsc_stats->stats.InOctetsDecrypted += skb->len; 786 else 787 rxsc_stats->stats.InOctetsValidated += skb->len; 788 u64_stats_update_end(&rxsc_stats->syncp); 789 } 790 791 if (!macsec_skb_cb(skb)->valid) { 792 spin_unlock(&rx_sa->lock); 793 794 /* 10.6.5 */ 795 if (hdr->tci_an & MACSEC_TCI_C || 796 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 797 u64_stats_update_begin(&rxsc_stats->syncp); 798 rxsc_stats->stats.InPktsNotValid++; 799 u64_stats_update_end(&rxsc_stats->syncp); 800 return false; 801 } 802 803 u64_stats_update_begin(&rxsc_stats->syncp); 804 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 805 rxsc_stats->stats.InPktsInvalid++; 806 this_cpu_inc(rx_sa->stats->InPktsInvalid); 807 } else if (pn < lowest_pn) { 808 rxsc_stats->stats.InPktsDelayed++; 809 } else { 810 rxsc_stats->stats.InPktsUnchecked++; 811 } 812 u64_stats_update_end(&rxsc_stats->syncp); 813 } else { 814 u64_stats_update_begin(&rxsc_stats->syncp); 815 if (pn < lowest_pn) { 816 rxsc_stats->stats.InPktsDelayed++; 817 } else { 818 rxsc_stats->stats.InPktsOK++; 819 this_cpu_inc(rx_sa->stats->InPktsOK); 820 } 821 u64_stats_update_end(&rxsc_stats->syncp); 822 823 if (pn >= rx_sa->next_pn) 824 rx_sa->next_pn = pn + 1; 825 spin_unlock(&rx_sa->lock); 826 } 827 828 return true; 829 } 830 831 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 832 { 833 skb->pkt_type = PACKET_HOST; 834 skb->protocol = eth_type_trans(skb, dev); 835 836 skb_reset_network_header(skb); 837 if (!skb_transport_header_was_set(skb)) 838 skb_reset_transport_header(skb); 839 skb_reset_mac_len(skb); 840 } 841 842 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 843 { 844 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 845 skb_pull(skb, hdr_len); 846 pskb_trim_unique(skb, skb->len - icv_len); 847 } 848 849 static void count_rx(struct net_device *dev, int len) 850 { 851 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 852 853 u64_stats_update_begin(&stats->syncp); 854 stats->rx_packets++; 855 stats->rx_bytes += len; 856 u64_stats_update_end(&stats->syncp); 857 } 858 859 static void macsec_decrypt_done(struct crypto_async_request *base, int err) 860 { 861 struct sk_buff *skb = base->data; 862 struct net_device *dev = skb->dev; 863 struct macsec_dev *macsec = macsec_priv(dev); 864 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 865 struct macsec_rx_sc *rx_sc = rx_sa->sc; 866 int len, ret; 867 u32 pn; 868 869 aead_request_free(macsec_skb_cb(skb)->req); 870 871 rcu_read_lock_bh(); 872 pn = ntohl(macsec_ethhdr(skb)->packet_number); 873 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 874 rcu_read_unlock_bh(); 875 kfree_skb(skb); 876 goto out; 877 } 878 879 macsec_finalize_skb(skb, macsec->secy.icv_len, 880 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 881 macsec_reset_skb(skb, macsec->secy.netdev); 882 883 len = skb->len; 884 ret = gro_cells_receive(&macsec->gro_cells, skb); 885 if (ret == NET_RX_SUCCESS) 886 count_rx(dev, len); 887 else 888 macsec->secy.netdev->stats.rx_dropped++; 889 890 rcu_read_unlock_bh(); 891 892 out: 893 macsec_rxsa_put(rx_sa); 894 macsec_rxsc_put(rx_sc); 895 dev_put(dev); 896 } 897 898 static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 899 struct net_device *dev, 900 struct macsec_rx_sa *rx_sa, 901 sci_t sci, 902 struct macsec_secy *secy) 903 { 904 int ret; 905 struct scatterlist *sg; 906 unsigned char *iv; 907 struct aead_request *req; 908 struct macsec_eth_header *hdr; 909 u16 icv_len = secy->icv_len; 910 911 macsec_skb_cb(skb)->valid = false; 912 skb = skb_share_check(skb, GFP_ATOMIC); 913 if (!skb) 914 return ERR_PTR(-ENOMEM); 915 916 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg); 917 if (!req) { 918 kfree_skb(skb); 919 return ERR_PTR(-ENOMEM); 920 } 921 922 hdr = (struct macsec_eth_header *)skb->data; 923 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number)); 924 925 sg_init_table(sg, MAX_SKB_FRAGS + 1); 926 skb_to_sgvec(skb, sg, 0, skb->len); 927 928 if (hdr->tci_an & MACSEC_TCI_E) { 929 /* confidentiality: ethernet + macsec header 930 * authenticated, encrypted payload 931 */ 932 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 933 934 aead_request_set_crypt(req, sg, sg, len, iv); 935 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 936 skb = skb_unshare(skb, GFP_ATOMIC); 937 if (!skb) { 938 aead_request_free(req); 939 return ERR_PTR(-ENOMEM); 940 } 941 } else { 942 /* integrity only: all headers + data authenticated */ 943 aead_request_set_crypt(req, sg, sg, icv_len, iv); 944 aead_request_set_ad(req, skb->len - icv_len); 945 } 946 947 macsec_skb_cb(skb)->req = req; 948 skb->dev = dev; 949 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 950 951 dev_hold(dev); 952 ret = crypto_aead_decrypt(req); 953 if (ret == -EINPROGRESS) { 954 return ERR_PTR(ret); 955 } else if (ret != 0) { 956 /* decryption/authentication failed 957 * 10.6 if validateFrames is disabled, deliver anyway 958 */ 959 if (ret != -EBADMSG) { 960 kfree_skb(skb); 961 skb = ERR_PTR(ret); 962 } 963 } else { 964 macsec_skb_cb(skb)->valid = true; 965 } 966 dev_put(dev); 967 968 aead_request_free(req); 969 970 return skb; 971 } 972 973 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 974 { 975 struct macsec_rx_sc *rx_sc; 976 977 for_each_rxsc(secy, rx_sc) { 978 if (rx_sc->sci == sci) 979 return rx_sc; 980 } 981 982 return NULL; 983 } 984 985 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 986 { 987 struct macsec_rx_sc *rx_sc; 988 989 for_each_rxsc_rtnl(secy, rx_sc) { 990 if (rx_sc->sci == sci) 991 return rx_sc; 992 } 993 994 return NULL; 995 } 996 997 static void handle_not_macsec(struct sk_buff *skb) 998 { 999 struct macsec_rxh_data *rxd; 1000 struct macsec_dev *macsec; 1001 1002 rcu_read_lock(); 1003 rxd = macsec_data_rcu(skb->dev); 1004 1005 /* 10.6 If the management control validateFrames is not 1006 * Strict, frames without a SecTAG are received, counted, and 1007 * delivered to the Controlled Port 1008 */ 1009 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1010 struct sk_buff *nskb; 1011 int ret; 1012 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 1013 1014 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1015 u64_stats_update_begin(&secy_stats->syncp); 1016 secy_stats->stats.InPktsNoTag++; 1017 u64_stats_update_end(&secy_stats->syncp); 1018 continue; 1019 } 1020 1021 /* deliver on this port */ 1022 nskb = skb_clone(skb, GFP_ATOMIC); 1023 if (!nskb) 1024 break; 1025 1026 nskb->dev = macsec->secy.netdev; 1027 1028 ret = netif_rx(nskb); 1029 if (ret == NET_RX_SUCCESS) { 1030 u64_stats_update_begin(&secy_stats->syncp); 1031 secy_stats->stats.InPktsUntagged++; 1032 u64_stats_update_end(&secy_stats->syncp); 1033 } else { 1034 macsec->secy.netdev->stats.rx_dropped++; 1035 } 1036 } 1037 1038 rcu_read_unlock(); 1039 } 1040 1041 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 1042 { 1043 struct sk_buff *skb = *pskb; 1044 struct net_device *dev = skb->dev; 1045 struct macsec_eth_header *hdr; 1046 struct macsec_secy *secy = NULL; 1047 struct macsec_rx_sc *rx_sc; 1048 struct macsec_rx_sa *rx_sa; 1049 struct macsec_rxh_data *rxd; 1050 struct macsec_dev *macsec; 1051 sci_t sci; 1052 u32 pn; 1053 bool cbit; 1054 struct pcpu_rx_sc_stats *rxsc_stats; 1055 struct pcpu_secy_stats *secy_stats; 1056 bool pulled_sci; 1057 int ret; 1058 1059 if (skb_headroom(skb) < ETH_HLEN) 1060 goto drop_direct; 1061 1062 hdr = macsec_ethhdr(skb); 1063 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) { 1064 handle_not_macsec(skb); 1065 1066 /* and deliver to the uncontrolled port */ 1067 return RX_HANDLER_PASS; 1068 } 1069 1070 skb = skb_unshare(skb, GFP_ATOMIC); 1071 if (!skb) { 1072 *pskb = NULL; 1073 return RX_HANDLER_CONSUMED; 1074 } 1075 1076 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1077 if (!pulled_sci) { 1078 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1079 goto drop_direct; 1080 } 1081 1082 hdr = macsec_ethhdr(skb); 1083 1084 /* Frames with a SecTAG that has the TCI E bit set but the C 1085 * bit clear are discarded, as this reserved encoding is used 1086 * to identify frames with a SecTAG that are not to be 1087 * delivered to the Controlled Port. 1088 */ 1089 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1090 return RX_HANDLER_PASS; 1091 1092 /* now, pull the extra length */ 1093 if (hdr->tci_an & MACSEC_TCI_SC) { 1094 if (!pulled_sci) 1095 goto drop_direct; 1096 } 1097 1098 /* ethernet header is part of crypto processing */ 1099 skb_push(skb, ETH_HLEN); 1100 1101 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1102 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1103 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci); 1104 1105 rcu_read_lock(); 1106 rxd = macsec_data_rcu(skb->dev); 1107 1108 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1109 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1110 sc = sc ? macsec_rxsc_get(sc) : NULL; 1111 1112 if (sc) { 1113 secy = &macsec->secy; 1114 rx_sc = sc; 1115 break; 1116 } 1117 } 1118 1119 if (!secy) 1120 goto nosci; 1121 1122 dev = secy->netdev; 1123 macsec = macsec_priv(dev); 1124 secy_stats = this_cpu_ptr(macsec->stats); 1125 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1126 1127 if (!macsec_validate_skb(skb, secy->icv_len)) { 1128 u64_stats_update_begin(&secy_stats->syncp); 1129 secy_stats->stats.InPktsBadTag++; 1130 u64_stats_update_end(&secy_stats->syncp); 1131 goto drop_nosa; 1132 } 1133 1134 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1135 if (!rx_sa) { 1136 /* 10.6.1 if the SA is not in use */ 1137 1138 /* If validateFrames is Strict or the C bit in the 1139 * SecTAG is set, discard 1140 */ 1141 if (hdr->tci_an & MACSEC_TCI_C || 1142 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1143 u64_stats_update_begin(&rxsc_stats->syncp); 1144 rxsc_stats->stats.InPktsNotUsingSA++; 1145 u64_stats_update_end(&rxsc_stats->syncp); 1146 goto drop_nosa; 1147 } 1148 1149 /* not Strict, the frame (with the SecTAG and ICV 1150 * removed) is delivered to the Controlled Port. 1151 */ 1152 u64_stats_update_begin(&rxsc_stats->syncp); 1153 rxsc_stats->stats.InPktsUnusedSA++; 1154 u64_stats_update_end(&rxsc_stats->syncp); 1155 goto deliver; 1156 } 1157 1158 /* First, PN check to avoid decrypting obviously wrong packets */ 1159 pn = ntohl(hdr->packet_number); 1160 if (secy->replay_protect) { 1161 bool late; 1162 1163 spin_lock(&rx_sa->lock); 1164 late = rx_sa->next_pn >= secy->replay_window && 1165 pn < (rx_sa->next_pn - secy->replay_window); 1166 spin_unlock(&rx_sa->lock); 1167 1168 if (late) { 1169 u64_stats_update_begin(&rxsc_stats->syncp); 1170 rxsc_stats->stats.InPktsLate++; 1171 u64_stats_update_end(&rxsc_stats->syncp); 1172 goto drop; 1173 } 1174 } 1175 1176 macsec_skb_cb(skb)->rx_sa = rx_sa; 1177 1178 /* Disabled && !changed text => skip validation */ 1179 if (hdr->tci_an & MACSEC_TCI_C || 1180 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1181 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1182 1183 if (IS_ERR(skb)) { 1184 /* the decrypt callback needs the reference */ 1185 if (PTR_ERR(skb) != -EINPROGRESS) { 1186 macsec_rxsa_put(rx_sa); 1187 macsec_rxsc_put(rx_sc); 1188 } 1189 rcu_read_unlock(); 1190 *pskb = NULL; 1191 return RX_HANDLER_CONSUMED; 1192 } 1193 1194 if (!macsec_post_decrypt(skb, secy, pn)) 1195 goto drop; 1196 1197 deliver: 1198 macsec_finalize_skb(skb, secy->icv_len, 1199 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1200 macsec_reset_skb(skb, secy->netdev); 1201 1202 if (rx_sa) 1203 macsec_rxsa_put(rx_sa); 1204 macsec_rxsc_put(rx_sc); 1205 1206 ret = gro_cells_receive(&macsec->gro_cells, skb); 1207 if (ret == NET_RX_SUCCESS) 1208 count_rx(dev, skb->len); 1209 else 1210 macsec->secy.netdev->stats.rx_dropped++; 1211 1212 rcu_read_unlock(); 1213 1214 *pskb = NULL; 1215 return RX_HANDLER_CONSUMED; 1216 1217 drop: 1218 macsec_rxsa_put(rx_sa); 1219 drop_nosa: 1220 macsec_rxsc_put(rx_sc); 1221 rcu_read_unlock(); 1222 drop_direct: 1223 kfree_skb(skb); 1224 *pskb = NULL; 1225 return RX_HANDLER_CONSUMED; 1226 1227 nosci: 1228 /* 10.6.1 if the SC is not found */ 1229 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1230 if (!cbit) 1231 macsec_finalize_skb(skb, DEFAULT_ICV_LEN, 1232 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1233 1234 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1235 struct sk_buff *nskb; 1236 1237 secy_stats = this_cpu_ptr(macsec->stats); 1238 1239 /* If validateFrames is Strict or the C bit in the 1240 * SecTAG is set, discard 1241 */ 1242 if (cbit || 1243 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1244 u64_stats_update_begin(&secy_stats->syncp); 1245 secy_stats->stats.InPktsNoSCI++; 1246 u64_stats_update_end(&secy_stats->syncp); 1247 continue; 1248 } 1249 1250 /* not strict, the frame (with the SecTAG and ICV 1251 * removed) is delivered to the Controlled Port. 1252 */ 1253 nskb = skb_clone(skb, GFP_ATOMIC); 1254 if (!nskb) 1255 break; 1256 1257 macsec_reset_skb(nskb, macsec->secy.netdev); 1258 1259 ret = netif_rx(nskb); 1260 if (ret == NET_RX_SUCCESS) { 1261 u64_stats_update_begin(&secy_stats->syncp); 1262 secy_stats->stats.InPktsUnknownSCI++; 1263 u64_stats_update_end(&secy_stats->syncp); 1264 } else { 1265 macsec->secy.netdev->stats.rx_dropped++; 1266 } 1267 } 1268 1269 rcu_read_unlock(); 1270 *pskb = skb; 1271 return RX_HANDLER_PASS; 1272 } 1273 1274 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1275 { 1276 struct crypto_aead *tfm; 1277 int ret; 1278 1279 tfm = crypto_alloc_aead("gcm(aes)", 0, 0); 1280 1281 if (IS_ERR(tfm)) 1282 return tfm; 1283 1284 ret = crypto_aead_setkey(tfm, key, key_len); 1285 if (ret < 0) 1286 goto fail; 1287 1288 ret = crypto_aead_setauthsize(tfm, icv_len); 1289 if (ret < 0) 1290 goto fail; 1291 1292 return tfm; 1293 fail: 1294 crypto_free_aead(tfm); 1295 return ERR_PTR(ret); 1296 } 1297 1298 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1299 int icv_len) 1300 { 1301 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1302 if (!rx_sa->stats) 1303 return -ENOMEM; 1304 1305 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1306 if (IS_ERR(rx_sa->key.tfm)) { 1307 free_percpu(rx_sa->stats); 1308 return PTR_ERR(rx_sa->key.tfm); 1309 } 1310 1311 rx_sa->active = false; 1312 rx_sa->next_pn = 1; 1313 atomic_set(&rx_sa->refcnt, 1); 1314 spin_lock_init(&rx_sa->lock); 1315 1316 return 0; 1317 } 1318 1319 static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1320 { 1321 rx_sa->active = false; 1322 1323 macsec_rxsa_put(rx_sa); 1324 } 1325 1326 static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1327 { 1328 int i; 1329 1330 for (i = 0; i < MACSEC_NUM_AN; i++) { 1331 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1332 1333 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1334 if (sa) 1335 clear_rx_sa(sa); 1336 } 1337 1338 macsec_rxsc_put(rx_sc); 1339 } 1340 1341 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1342 { 1343 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1344 1345 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1346 rx_sc; 1347 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1348 if (rx_sc->sci == sci) { 1349 if (rx_sc->active) 1350 secy->n_rx_sc--; 1351 rcu_assign_pointer(*rx_scp, rx_sc->next); 1352 return rx_sc; 1353 } 1354 } 1355 1356 return NULL; 1357 } 1358 1359 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci) 1360 { 1361 struct macsec_rx_sc *rx_sc; 1362 struct macsec_dev *macsec; 1363 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1364 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1365 struct macsec_secy *secy; 1366 1367 list_for_each_entry(macsec, &rxd->secys, secys) { 1368 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1369 return ERR_PTR(-EEXIST); 1370 } 1371 1372 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL); 1373 if (!rx_sc) 1374 return ERR_PTR(-ENOMEM); 1375 1376 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1377 if (!rx_sc->stats) { 1378 kfree(rx_sc); 1379 return ERR_PTR(-ENOMEM); 1380 } 1381 1382 rx_sc->sci = sci; 1383 rx_sc->active = true; 1384 atomic_set(&rx_sc->refcnt, 1); 1385 1386 secy = &macsec_priv(dev)->secy; 1387 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1388 rcu_assign_pointer(secy->rx_sc, rx_sc); 1389 1390 if (rx_sc->active) 1391 secy->n_rx_sc++; 1392 1393 return rx_sc; 1394 } 1395 1396 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1397 int icv_len) 1398 { 1399 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1400 if (!tx_sa->stats) 1401 return -ENOMEM; 1402 1403 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1404 if (IS_ERR(tx_sa->key.tfm)) { 1405 free_percpu(tx_sa->stats); 1406 return PTR_ERR(tx_sa->key.tfm); 1407 } 1408 1409 tx_sa->active = false; 1410 atomic_set(&tx_sa->refcnt, 1); 1411 spin_lock_init(&tx_sa->lock); 1412 1413 return 0; 1414 } 1415 1416 static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1417 { 1418 tx_sa->active = false; 1419 1420 macsec_txsa_put(tx_sa); 1421 } 1422 1423 static struct genl_family macsec_fam = { 1424 .id = GENL_ID_GENERATE, 1425 .name = MACSEC_GENL_NAME, 1426 .hdrsize = 0, 1427 .version = MACSEC_GENL_VERSION, 1428 .maxattr = MACSEC_ATTR_MAX, 1429 .netnsok = true, 1430 }; 1431 1432 static struct net_device *get_dev_from_nl(struct net *net, 1433 struct nlattr **attrs) 1434 { 1435 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1436 struct net_device *dev; 1437 1438 dev = __dev_get_by_index(net, ifindex); 1439 if (!dev) 1440 return ERR_PTR(-ENODEV); 1441 1442 if (!netif_is_macsec(dev)) 1443 return ERR_PTR(-ENODEV); 1444 1445 return dev; 1446 } 1447 1448 static sci_t nla_get_sci(const struct nlattr *nla) 1449 { 1450 return (__force sci_t)nla_get_u64(nla); 1451 } 1452 1453 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, 1454 int padattr) 1455 { 1456 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); 1457 } 1458 1459 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1460 struct nlattr **attrs, 1461 struct nlattr **tb_sa, 1462 struct net_device **devp, 1463 struct macsec_secy **secyp, 1464 struct macsec_tx_sc **scp, 1465 u8 *assoc_num) 1466 { 1467 struct net_device *dev; 1468 struct macsec_secy *secy; 1469 struct macsec_tx_sc *tx_sc; 1470 struct macsec_tx_sa *tx_sa; 1471 1472 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1473 return ERR_PTR(-EINVAL); 1474 1475 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1476 1477 dev = get_dev_from_nl(net, attrs); 1478 if (IS_ERR(dev)) 1479 return ERR_CAST(dev); 1480 1481 if (*assoc_num >= MACSEC_NUM_AN) 1482 return ERR_PTR(-EINVAL); 1483 1484 secy = &macsec_priv(dev)->secy; 1485 tx_sc = &secy->tx_sc; 1486 1487 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1488 if (!tx_sa) 1489 return ERR_PTR(-ENODEV); 1490 1491 *devp = dev; 1492 *scp = tx_sc; 1493 *secyp = secy; 1494 return tx_sa; 1495 } 1496 1497 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1498 struct nlattr **attrs, 1499 struct nlattr **tb_rxsc, 1500 struct net_device **devp, 1501 struct macsec_secy **secyp) 1502 { 1503 struct net_device *dev; 1504 struct macsec_secy *secy; 1505 struct macsec_rx_sc *rx_sc; 1506 sci_t sci; 1507 1508 dev = get_dev_from_nl(net, attrs); 1509 if (IS_ERR(dev)) 1510 return ERR_CAST(dev); 1511 1512 secy = &macsec_priv(dev)->secy; 1513 1514 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1515 return ERR_PTR(-EINVAL); 1516 1517 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1518 rx_sc = find_rx_sc_rtnl(secy, sci); 1519 if (!rx_sc) 1520 return ERR_PTR(-ENODEV); 1521 1522 *secyp = secy; 1523 *devp = dev; 1524 1525 return rx_sc; 1526 } 1527 1528 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1529 struct nlattr **attrs, 1530 struct nlattr **tb_rxsc, 1531 struct nlattr **tb_sa, 1532 struct net_device **devp, 1533 struct macsec_secy **secyp, 1534 struct macsec_rx_sc **scp, 1535 u8 *assoc_num) 1536 { 1537 struct macsec_rx_sc *rx_sc; 1538 struct macsec_rx_sa *rx_sa; 1539 1540 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1541 return ERR_PTR(-EINVAL); 1542 1543 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1544 if (*assoc_num >= MACSEC_NUM_AN) 1545 return ERR_PTR(-EINVAL); 1546 1547 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1548 if (IS_ERR(rx_sc)) 1549 return ERR_CAST(rx_sc); 1550 1551 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1552 if (!rx_sa) 1553 return ERR_PTR(-ENODEV); 1554 1555 *scp = rx_sc; 1556 return rx_sa; 1557 } 1558 1559 1560 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1561 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1562 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1563 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1564 }; 1565 1566 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1567 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1568 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, 1569 }; 1570 1571 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1572 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, 1573 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, 1574 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 }, 1575 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY, 1576 .len = MACSEC_KEYID_LEN, }, 1577 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1578 .len = MACSEC_MAX_KEY_LEN, }, 1579 }; 1580 1581 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1582 { 1583 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1584 return -EINVAL; 1585 1586 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], 1587 macsec_genl_sa_policy)) 1588 return -EINVAL; 1589 1590 return 0; 1591 } 1592 1593 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1594 { 1595 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1596 return -EINVAL; 1597 1598 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], 1599 macsec_genl_rxsc_policy)) 1600 return -EINVAL; 1601 1602 return 0; 1603 } 1604 1605 static bool validate_add_rxsa(struct nlattr **attrs) 1606 { 1607 if (!attrs[MACSEC_SA_ATTR_AN] || 1608 !attrs[MACSEC_SA_ATTR_KEY] || 1609 !attrs[MACSEC_SA_ATTR_KEYID]) 1610 return false; 1611 1612 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1613 return false; 1614 1615 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1616 return false; 1617 1618 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1619 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1620 return false; 1621 } 1622 1623 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1624 return false; 1625 1626 return true; 1627 } 1628 1629 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1630 { 1631 struct net_device *dev; 1632 struct nlattr **attrs = info->attrs; 1633 struct macsec_secy *secy; 1634 struct macsec_rx_sc *rx_sc; 1635 struct macsec_rx_sa *rx_sa; 1636 unsigned char assoc_num; 1637 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1638 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1639 int err; 1640 1641 if (!attrs[MACSEC_ATTR_IFINDEX]) 1642 return -EINVAL; 1643 1644 if (parse_sa_config(attrs, tb_sa)) 1645 return -EINVAL; 1646 1647 if (parse_rxsc_config(attrs, tb_rxsc)) 1648 return -EINVAL; 1649 1650 if (!validate_add_rxsa(tb_sa)) 1651 return -EINVAL; 1652 1653 rtnl_lock(); 1654 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1655 if (IS_ERR(rx_sc)) { 1656 rtnl_unlock(); 1657 return PTR_ERR(rx_sc); 1658 } 1659 1660 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1661 1662 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1663 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1664 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1665 rtnl_unlock(); 1666 return -EINVAL; 1667 } 1668 1669 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1670 if (rx_sa) { 1671 rtnl_unlock(); 1672 return -EBUSY; 1673 } 1674 1675 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1676 if (!rx_sa) { 1677 rtnl_unlock(); 1678 return -ENOMEM; 1679 } 1680 1681 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1682 secy->key_len, secy->icv_len); 1683 if (err < 0) { 1684 kfree(rx_sa); 1685 rtnl_unlock(); 1686 return err; 1687 } 1688 1689 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1690 spin_lock_bh(&rx_sa->lock); 1691 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1692 spin_unlock_bh(&rx_sa->lock); 1693 } 1694 1695 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1696 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1697 1698 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1699 rx_sa->sc = rx_sc; 1700 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1701 1702 rtnl_unlock(); 1703 1704 return 0; 1705 } 1706 1707 static bool validate_add_rxsc(struct nlattr **attrs) 1708 { 1709 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1710 return false; 1711 1712 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1713 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1714 return false; 1715 } 1716 1717 return true; 1718 } 1719 1720 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1721 { 1722 struct net_device *dev; 1723 sci_t sci = MACSEC_UNDEF_SCI; 1724 struct nlattr **attrs = info->attrs; 1725 struct macsec_rx_sc *rx_sc; 1726 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1727 1728 if (!attrs[MACSEC_ATTR_IFINDEX]) 1729 return -EINVAL; 1730 1731 if (parse_rxsc_config(attrs, tb_rxsc)) 1732 return -EINVAL; 1733 1734 if (!validate_add_rxsc(tb_rxsc)) 1735 return -EINVAL; 1736 1737 rtnl_lock(); 1738 dev = get_dev_from_nl(genl_info_net(info), attrs); 1739 if (IS_ERR(dev)) { 1740 rtnl_unlock(); 1741 return PTR_ERR(dev); 1742 } 1743 1744 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1745 1746 rx_sc = create_rx_sc(dev, sci); 1747 if (IS_ERR(rx_sc)) { 1748 rtnl_unlock(); 1749 return PTR_ERR(rx_sc); 1750 } 1751 1752 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1753 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1754 1755 rtnl_unlock(); 1756 1757 return 0; 1758 } 1759 1760 static bool validate_add_txsa(struct nlattr **attrs) 1761 { 1762 if (!attrs[MACSEC_SA_ATTR_AN] || 1763 !attrs[MACSEC_SA_ATTR_PN] || 1764 !attrs[MACSEC_SA_ATTR_KEY] || 1765 !attrs[MACSEC_SA_ATTR_KEYID]) 1766 return false; 1767 1768 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1769 return false; 1770 1771 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1772 return false; 1773 1774 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1775 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1776 return false; 1777 } 1778 1779 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1780 return false; 1781 1782 return true; 1783 } 1784 1785 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1786 { 1787 struct net_device *dev; 1788 struct nlattr **attrs = info->attrs; 1789 struct macsec_secy *secy; 1790 struct macsec_tx_sc *tx_sc; 1791 struct macsec_tx_sa *tx_sa; 1792 unsigned char assoc_num; 1793 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1794 int err; 1795 1796 if (!attrs[MACSEC_ATTR_IFINDEX]) 1797 return -EINVAL; 1798 1799 if (parse_sa_config(attrs, tb_sa)) 1800 return -EINVAL; 1801 1802 if (!validate_add_txsa(tb_sa)) 1803 return -EINVAL; 1804 1805 rtnl_lock(); 1806 dev = get_dev_from_nl(genl_info_net(info), attrs); 1807 if (IS_ERR(dev)) { 1808 rtnl_unlock(); 1809 return PTR_ERR(dev); 1810 } 1811 1812 secy = &macsec_priv(dev)->secy; 1813 tx_sc = &secy->tx_sc; 1814 1815 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1816 1817 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1818 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 1819 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1820 rtnl_unlock(); 1821 return -EINVAL; 1822 } 1823 1824 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 1825 if (tx_sa) { 1826 rtnl_unlock(); 1827 return -EBUSY; 1828 } 1829 1830 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 1831 if (!tx_sa) { 1832 rtnl_unlock(); 1833 return -ENOMEM; 1834 } 1835 1836 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1837 secy->key_len, secy->icv_len); 1838 if (err < 0) { 1839 kfree(tx_sa); 1840 rtnl_unlock(); 1841 return err; 1842 } 1843 1844 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1845 1846 spin_lock_bh(&tx_sa->lock); 1847 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1848 spin_unlock_bh(&tx_sa->lock); 1849 1850 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1851 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1852 1853 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 1854 secy->operational = true; 1855 1856 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 1857 1858 rtnl_unlock(); 1859 1860 return 0; 1861 } 1862 1863 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 1864 { 1865 struct nlattr **attrs = info->attrs; 1866 struct net_device *dev; 1867 struct macsec_secy *secy; 1868 struct macsec_rx_sc *rx_sc; 1869 struct macsec_rx_sa *rx_sa; 1870 u8 assoc_num; 1871 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1872 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1873 1874 if (!attrs[MACSEC_ATTR_IFINDEX]) 1875 return -EINVAL; 1876 1877 if (parse_sa_config(attrs, tb_sa)) 1878 return -EINVAL; 1879 1880 if (parse_rxsc_config(attrs, tb_rxsc)) 1881 return -EINVAL; 1882 1883 rtnl_lock(); 1884 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 1885 &dev, &secy, &rx_sc, &assoc_num); 1886 if (IS_ERR(rx_sa)) { 1887 rtnl_unlock(); 1888 return PTR_ERR(rx_sa); 1889 } 1890 1891 if (rx_sa->active) { 1892 rtnl_unlock(); 1893 return -EBUSY; 1894 } 1895 1896 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 1897 clear_rx_sa(rx_sa); 1898 1899 rtnl_unlock(); 1900 1901 return 0; 1902 } 1903 1904 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 1905 { 1906 struct nlattr **attrs = info->attrs; 1907 struct net_device *dev; 1908 struct macsec_secy *secy; 1909 struct macsec_rx_sc *rx_sc; 1910 sci_t sci; 1911 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1912 1913 if (!attrs[MACSEC_ATTR_IFINDEX]) 1914 return -EINVAL; 1915 1916 if (parse_rxsc_config(attrs, tb_rxsc)) 1917 return -EINVAL; 1918 1919 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1920 return -EINVAL; 1921 1922 rtnl_lock(); 1923 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 1924 if (IS_ERR(dev)) { 1925 rtnl_unlock(); 1926 return PTR_ERR(dev); 1927 } 1928 1929 secy = &macsec_priv(dev)->secy; 1930 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1931 1932 rx_sc = del_rx_sc(secy, sci); 1933 if (!rx_sc) { 1934 rtnl_unlock(); 1935 return -ENODEV; 1936 } 1937 1938 free_rx_sc(rx_sc); 1939 rtnl_unlock(); 1940 1941 return 0; 1942 } 1943 1944 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 1945 { 1946 struct nlattr **attrs = info->attrs; 1947 struct net_device *dev; 1948 struct macsec_secy *secy; 1949 struct macsec_tx_sc *tx_sc; 1950 struct macsec_tx_sa *tx_sa; 1951 u8 assoc_num; 1952 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1953 1954 if (!attrs[MACSEC_ATTR_IFINDEX]) 1955 return -EINVAL; 1956 1957 if (parse_sa_config(attrs, tb_sa)) 1958 return -EINVAL; 1959 1960 rtnl_lock(); 1961 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 1962 &dev, &secy, &tx_sc, &assoc_num); 1963 if (IS_ERR(tx_sa)) { 1964 rtnl_unlock(); 1965 return PTR_ERR(tx_sa); 1966 } 1967 1968 if (tx_sa->active) { 1969 rtnl_unlock(); 1970 return -EBUSY; 1971 } 1972 1973 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 1974 clear_tx_sa(tx_sa); 1975 1976 rtnl_unlock(); 1977 1978 return 0; 1979 } 1980 1981 static bool validate_upd_sa(struct nlattr **attrs) 1982 { 1983 if (!attrs[MACSEC_SA_ATTR_AN] || 1984 attrs[MACSEC_SA_ATTR_KEY] || 1985 attrs[MACSEC_SA_ATTR_KEYID]) 1986 return false; 1987 1988 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1989 return false; 1990 1991 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1992 return false; 1993 1994 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1995 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1996 return false; 1997 } 1998 1999 return true; 2000 } 2001 2002 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2003 { 2004 struct nlattr **attrs = info->attrs; 2005 struct net_device *dev; 2006 struct macsec_secy *secy; 2007 struct macsec_tx_sc *tx_sc; 2008 struct macsec_tx_sa *tx_sa; 2009 u8 assoc_num; 2010 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2011 2012 if (!attrs[MACSEC_ATTR_IFINDEX]) 2013 return -EINVAL; 2014 2015 if (parse_sa_config(attrs, tb_sa)) 2016 return -EINVAL; 2017 2018 if (!validate_upd_sa(tb_sa)) 2019 return -EINVAL; 2020 2021 rtnl_lock(); 2022 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2023 &dev, &secy, &tx_sc, &assoc_num); 2024 if (IS_ERR(tx_sa)) { 2025 rtnl_unlock(); 2026 return PTR_ERR(tx_sa); 2027 } 2028 2029 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2030 spin_lock_bh(&tx_sa->lock); 2031 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 2032 spin_unlock_bh(&tx_sa->lock); 2033 } 2034 2035 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2036 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2037 2038 if (assoc_num == tx_sc->encoding_sa) 2039 secy->operational = tx_sa->active; 2040 2041 rtnl_unlock(); 2042 2043 return 0; 2044 } 2045 2046 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2047 { 2048 struct nlattr **attrs = info->attrs; 2049 struct net_device *dev; 2050 struct macsec_secy *secy; 2051 struct macsec_rx_sc *rx_sc; 2052 struct macsec_rx_sa *rx_sa; 2053 u8 assoc_num; 2054 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2055 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2056 2057 if (!attrs[MACSEC_ATTR_IFINDEX]) 2058 return -EINVAL; 2059 2060 if (parse_rxsc_config(attrs, tb_rxsc)) 2061 return -EINVAL; 2062 2063 if (parse_sa_config(attrs, tb_sa)) 2064 return -EINVAL; 2065 2066 if (!validate_upd_sa(tb_sa)) 2067 return -EINVAL; 2068 2069 rtnl_lock(); 2070 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2071 &dev, &secy, &rx_sc, &assoc_num); 2072 if (IS_ERR(rx_sa)) { 2073 rtnl_unlock(); 2074 return PTR_ERR(rx_sa); 2075 } 2076 2077 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2078 spin_lock_bh(&rx_sa->lock); 2079 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 2080 spin_unlock_bh(&rx_sa->lock); 2081 } 2082 2083 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2084 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2085 2086 rtnl_unlock(); 2087 return 0; 2088 } 2089 2090 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2091 { 2092 struct nlattr **attrs = info->attrs; 2093 struct net_device *dev; 2094 struct macsec_secy *secy; 2095 struct macsec_rx_sc *rx_sc; 2096 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2097 2098 if (!attrs[MACSEC_ATTR_IFINDEX]) 2099 return -EINVAL; 2100 2101 if (parse_rxsc_config(attrs, tb_rxsc)) 2102 return -EINVAL; 2103 2104 if (!validate_add_rxsc(tb_rxsc)) 2105 return -EINVAL; 2106 2107 rtnl_lock(); 2108 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2109 if (IS_ERR(rx_sc)) { 2110 rtnl_unlock(); 2111 return PTR_ERR(rx_sc); 2112 } 2113 2114 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2115 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2116 2117 if (rx_sc->active != new) 2118 secy->n_rx_sc += new ? 1 : -1; 2119 2120 rx_sc->active = new; 2121 } 2122 2123 rtnl_unlock(); 2124 2125 return 0; 2126 } 2127 2128 static int copy_tx_sa_stats(struct sk_buff *skb, 2129 struct macsec_tx_sa_stats __percpu *pstats) 2130 { 2131 struct macsec_tx_sa_stats sum = {0, }; 2132 int cpu; 2133 2134 for_each_possible_cpu(cpu) { 2135 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2136 2137 sum.OutPktsProtected += stats->OutPktsProtected; 2138 sum.OutPktsEncrypted += stats->OutPktsEncrypted; 2139 } 2140 2141 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) || 2142 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted)) 2143 return -EMSGSIZE; 2144 2145 return 0; 2146 } 2147 2148 static int copy_rx_sa_stats(struct sk_buff *skb, 2149 struct macsec_rx_sa_stats __percpu *pstats) 2150 { 2151 struct macsec_rx_sa_stats sum = {0, }; 2152 int cpu; 2153 2154 for_each_possible_cpu(cpu) { 2155 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2156 2157 sum.InPktsOK += stats->InPktsOK; 2158 sum.InPktsInvalid += stats->InPktsInvalid; 2159 sum.InPktsNotValid += stats->InPktsNotValid; 2160 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA; 2161 sum.InPktsUnusedSA += stats->InPktsUnusedSA; 2162 } 2163 2164 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) || 2165 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) || 2166 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) || 2167 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) || 2168 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA)) 2169 return -EMSGSIZE; 2170 2171 return 0; 2172 } 2173 2174 static int copy_rx_sc_stats(struct sk_buff *skb, 2175 struct pcpu_rx_sc_stats __percpu *pstats) 2176 { 2177 struct macsec_rx_sc_stats sum = {0, }; 2178 int cpu; 2179 2180 for_each_possible_cpu(cpu) { 2181 const struct pcpu_rx_sc_stats *stats; 2182 struct macsec_rx_sc_stats tmp; 2183 unsigned int start; 2184 2185 stats = per_cpu_ptr(pstats, cpu); 2186 do { 2187 start = u64_stats_fetch_begin_irq(&stats->syncp); 2188 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2189 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2190 2191 sum.InOctetsValidated += tmp.InOctetsValidated; 2192 sum.InOctetsDecrypted += tmp.InOctetsDecrypted; 2193 sum.InPktsUnchecked += tmp.InPktsUnchecked; 2194 sum.InPktsDelayed += tmp.InPktsDelayed; 2195 sum.InPktsOK += tmp.InPktsOK; 2196 sum.InPktsInvalid += tmp.InPktsInvalid; 2197 sum.InPktsLate += tmp.InPktsLate; 2198 sum.InPktsNotValid += tmp.InPktsNotValid; 2199 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2200 sum.InPktsUnusedSA += tmp.InPktsUnusedSA; 2201 } 2202 2203 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2204 sum.InOctetsValidated, 2205 MACSEC_RXSC_STATS_ATTR_PAD) || 2206 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2207 sum.InOctetsDecrypted, 2208 MACSEC_RXSC_STATS_ATTR_PAD) || 2209 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2210 sum.InPktsUnchecked, 2211 MACSEC_RXSC_STATS_ATTR_PAD) || 2212 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2213 sum.InPktsDelayed, 2214 MACSEC_RXSC_STATS_ATTR_PAD) || 2215 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2216 sum.InPktsOK, 2217 MACSEC_RXSC_STATS_ATTR_PAD) || 2218 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2219 sum.InPktsInvalid, 2220 MACSEC_RXSC_STATS_ATTR_PAD) || 2221 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2222 sum.InPktsLate, 2223 MACSEC_RXSC_STATS_ATTR_PAD) || 2224 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2225 sum.InPktsNotValid, 2226 MACSEC_RXSC_STATS_ATTR_PAD) || 2227 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2228 sum.InPktsNotUsingSA, 2229 MACSEC_RXSC_STATS_ATTR_PAD) || 2230 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2231 sum.InPktsUnusedSA, 2232 MACSEC_RXSC_STATS_ATTR_PAD)) 2233 return -EMSGSIZE; 2234 2235 return 0; 2236 } 2237 2238 static int copy_tx_sc_stats(struct sk_buff *skb, 2239 struct pcpu_tx_sc_stats __percpu *pstats) 2240 { 2241 struct macsec_tx_sc_stats sum = {0, }; 2242 int cpu; 2243 2244 for_each_possible_cpu(cpu) { 2245 const struct pcpu_tx_sc_stats *stats; 2246 struct macsec_tx_sc_stats tmp; 2247 unsigned int start; 2248 2249 stats = per_cpu_ptr(pstats, cpu); 2250 do { 2251 start = u64_stats_fetch_begin_irq(&stats->syncp); 2252 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2253 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2254 2255 sum.OutPktsProtected += tmp.OutPktsProtected; 2256 sum.OutPktsEncrypted += tmp.OutPktsEncrypted; 2257 sum.OutOctetsProtected += tmp.OutOctetsProtected; 2258 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2259 } 2260 2261 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2262 sum.OutPktsProtected, 2263 MACSEC_TXSC_STATS_ATTR_PAD) || 2264 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2265 sum.OutPktsEncrypted, 2266 MACSEC_TXSC_STATS_ATTR_PAD) || 2267 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2268 sum.OutOctetsProtected, 2269 MACSEC_TXSC_STATS_ATTR_PAD) || 2270 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2271 sum.OutOctetsEncrypted, 2272 MACSEC_TXSC_STATS_ATTR_PAD)) 2273 return -EMSGSIZE; 2274 2275 return 0; 2276 } 2277 2278 static int copy_secy_stats(struct sk_buff *skb, 2279 struct pcpu_secy_stats __percpu *pstats) 2280 { 2281 struct macsec_dev_stats sum = {0, }; 2282 int cpu; 2283 2284 for_each_possible_cpu(cpu) { 2285 const struct pcpu_secy_stats *stats; 2286 struct macsec_dev_stats tmp; 2287 unsigned int start; 2288 2289 stats = per_cpu_ptr(pstats, cpu); 2290 do { 2291 start = u64_stats_fetch_begin_irq(&stats->syncp); 2292 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2293 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2294 2295 sum.OutPktsUntagged += tmp.OutPktsUntagged; 2296 sum.InPktsUntagged += tmp.InPktsUntagged; 2297 sum.OutPktsTooLong += tmp.OutPktsTooLong; 2298 sum.InPktsNoTag += tmp.InPktsNoTag; 2299 sum.InPktsBadTag += tmp.InPktsBadTag; 2300 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2301 sum.InPktsNoSCI += tmp.InPktsNoSCI; 2302 sum.InPktsOverrun += tmp.InPktsOverrun; 2303 } 2304 2305 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 2306 sum.OutPktsUntagged, 2307 MACSEC_SECY_STATS_ATTR_PAD) || 2308 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 2309 sum.InPktsUntagged, 2310 MACSEC_SECY_STATS_ATTR_PAD) || 2311 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 2312 sum.OutPktsTooLong, 2313 MACSEC_SECY_STATS_ATTR_PAD) || 2314 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 2315 sum.InPktsNoTag, 2316 MACSEC_SECY_STATS_ATTR_PAD) || 2317 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 2318 sum.InPktsBadTag, 2319 MACSEC_SECY_STATS_ATTR_PAD) || 2320 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 2321 sum.InPktsUnknownSCI, 2322 MACSEC_SECY_STATS_ATTR_PAD) || 2323 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 2324 sum.InPktsNoSCI, 2325 MACSEC_SECY_STATS_ATTR_PAD) || 2326 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 2327 sum.InPktsOverrun, 2328 MACSEC_SECY_STATS_ATTR_PAD)) 2329 return -EMSGSIZE; 2330 2331 return 0; 2332 } 2333 2334 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 2335 { 2336 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2337 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY); 2338 2339 if (!secy_nest) 2340 return 1; 2341 2342 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 2343 MACSEC_SECY_ATTR_PAD) || 2344 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 2345 MACSEC_DEFAULT_CIPHER_ID, 2346 MACSEC_SECY_ATTR_PAD) || 2347 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 2348 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 2349 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 2350 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 2351 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 2352 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 2353 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 2354 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 2355 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 2356 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 2357 goto cancel; 2358 2359 if (secy->replay_protect) { 2360 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 2361 goto cancel; 2362 } 2363 2364 nla_nest_end(skb, secy_nest); 2365 return 0; 2366 2367 cancel: 2368 nla_nest_cancel(skb, secy_nest); 2369 return 1; 2370 } 2371 2372 static int dump_secy(struct macsec_secy *secy, struct net_device *dev, 2373 struct sk_buff *skb, struct netlink_callback *cb) 2374 { 2375 struct macsec_rx_sc *rx_sc; 2376 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2377 struct nlattr *txsa_list, *rxsc_list; 2378 int i, j; 2379 void *hdr; 2380 struct nlattr *attr; 2381 2382 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 2383 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 2384 if (!hdr) 2385 return -EMSGSIZE; 2386 2387 genl_dump_check_consistent(cb, hdr, &macsec_fam); 2388 2389 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 2390 goto nla_put_failure; 2391 2392 if (nla_put_secy(secy, skb)) 2393 goto nla_put_failure; 2394 2395 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS); 2396 if (!attr) 2397 goto nla_put_failure; 2398 if (copy_tx_sc_stats(skb, tx_sc->stats)) { 2399 nla_nest_cancel(skb, attr); 2400 goto nla_put_failure; 2401 } 2402 nla_nest_end(skb, attr); 2403 2404 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS); 2405 if (!attr) 2406 goto nla_put_failure; 2407 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) { 2408 nla_nest_cancel(skb, attr); 2409 goto nla_put_failure; 2410 } 2411 nla_nest_end(skb, attr); 2412 2413 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST); 2414 if (!txsa_list) 2415 goto nla_put_failure; 2416 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 2417 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 2418 struct nlattr *txsa_nest; 2419 2420 if (!tx_sa) 2421 continue; 2422 2423 txsa_nest = nla_nest_start(skb, j++); 2424 if (!txsa_nest) { 2425 nla_nest_cancel(skb, txsa_list); 2426 goto nla_put_failure; 2427 } 2428 2429 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2430 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) || 2431 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 2432 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 2433 nla_nest_cancel(skb, txsa_nest); 2434 nla_nest_cancel(skb, txsa_list); 2435 goto nla_put_failure; 2436 } 2437 2438 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS); 2439 if (!attr) { 2440 nla_nest_cancel(skb, txsa_nest); 2441 nla_nest_cancel(skb, txsa_list); 2442 goto nla_put_failure; 2443 } 2444 if (copy_tx_sa_stats(skb, tx_sa->stats)) { 2445 nla_nest_cancel(skb, attr); 2446 nla_nest_cancel(skb, txsa_nest); 2447 nla_nest_cancel(skb, txsa_list); 2448 goto nla_put_failure; 2449 } 2450 nla_nest_end(skb, attr); 2451 2452 nla_nest_end(skb, txsa_nest); 2453 } 2454 nla_nest_end(skb, txsa_list); 2455 2456 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST); 2457 if (!rxsc_list) 2458 goto nla_put_failure; 2459 2460 j = 1; 2461 for_each_rxsc_rtnl(secy, rx_sc) { 2462 int k; 2463 struct nlattr *rxsa_list; 2464 struct nlattr *rxsc_nest = nla_nest_start(skb, j++); 2465 2466 if (!rxsc_nest) { 2467 nla_nest_cancel(skb, rxsc_list); 2468 goto nla_put_failure; 2469 } 2470 2471 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 2472 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 2473 MACSEC_RXSC_ATTR_PAD)) { 2474 nla_nest_cancel(skb, rxsc_nest); 2475 nla_nest_cancel(skb, rxsc_list); 2476 goto nla_put_failure; 2477 } 2478 2479 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS); 2480 if (!attr) { 2481 nla_nest_cancel(skb, rxsc_nest); 2482 nla_nest_cancel(skb, rxsc_list); 2483 goto nla_put_failure; 2484 } 2485 if (copy_rx_sc_stats(skb, rx_sc->stats)) { 2486 nla_nest_cancel(skb, attr); 2487 nla_nest_cancel(skb, rxsc_nest); 2488 nla_nest_cancel(skb, rxsc_list); 2489 goto nla_put_failure; 2490 } 2491 nla_nest_end(skb, attr); 2492 2493 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST); 2494 if (!rxsa_list) { 2495 nla_nest_cancel(skb, rxsc_nest); 2496 nla_nest_cancel(skb, rxsc_list); 2497 goto nla_put_failure; 2498 } 2499 2500 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 2501 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 2502 struct nlattr *rxsa_nest; 2503 2504 if (!rx_sa) 2505 continue; 2506 2507 rxsa_nest = nla_nest_start(skb, k++); 2508 if (!rxsa_nest) { 2509 nla_nest_cancel(skb, rxsa_list); 2510 nla_nest_cancel(skb, rxsc_nest); 2511 nla_nest_cancel(skb, rxsc_list); 2512 goto nla_put_failure; 2513 } 2514 2515 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS); 2516 if (!attr) { 2517 nla_nest_cancel(skb, rxsa_list); 2518 nla_nest_cancel(skb, rxsc_nest); 2519 nla_nest_cancel(skb, rxsc_list); 2520 goto nla_put_failure; 2521 } 2522 if (copy_rx_sa_stats(skb, rx_sa->stats)) { 2523 nla_nest_cancel(skb, attr); 2524 nla_nest_cancel(skb, rxsa_list); 2525 nla_nest_cancel(skb, rxsc_nest); 2526 nla_nest_cancel(skb, rxsc_list); 2527 goto nla_put_failure; 2528 } 2529 nla_nest_end(skb, attr); 2530 2531 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2532 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) || 2533 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 2534 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 2535 nla_nest_cancel(skb, rxsa_nest); 2536 nla_nest_cancel(skb, rxsc_nest); 2537 nla_nest_cancel(skb, rxsc_list); 2538 goto nla_put_failure; 2539 } 2540 nla_nest_end(skb, rxsa_nest); 2541 } 2542 2543 nla_nest_end(skb, rxsa_list); 2544 nla_nest_end(skb, rxsc_nest); 2545 } 2546 2547 nla_nest_end(skb, rxsc_list); 2548 2549 genlmsg_end(skb, hdr); 2550 2551 return 0; 2552 2553 nla_put_failure: 2554 genlmsg_cancel(skb, hdr); 2555 return -EMSGSIZE; 2556 } 2557 2558 static int macsec_generation = 1; /* protected by RTNL */ 2559 2560 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 2561 { 2562 struct net *net = sock_net(skb->sk); 2563 struct net_device *dev; 2564 int dev_idx, d; 2565 2566 dev_idx = cb->args[0]; 2567 2568 d = 0; 2569 rtnl_lock(); 2570 2571 cb->seq = macsec_generation; 2572 2573 for_each_netdev(net, dev) { 2574 struct macsec_secy *secy; 2575 2576 if (d < dev_idx) 2577 goto next; 2578 2579 if (!netif_is_macsec(dev)) 2580 goto next; 2581 2582 secy = &macsec_priv(dev)->secy; 2583 if (dump_secy(secy, dev, skb, cb) < 0) 2584 goto done; 2585 next: 2586 d++; 2587 } 2588 2589 done: 2590 rtnl_unlock(); 2591 cb->args[0] = d; 2592 return skb->len; 2593 } 2594 2595 static const struct genl_ops macsec_genl_ops[] = { 2596 { 2597 .cmd = MACSEC_CMD_GET_TXSC, 2598 .dumpit = macsec_dump_txsc, 2599 .policy = macsec_genl_policy, 2600 }, 2601 { 2602 .cmd = MACSEC_CMD_ADD_RXSC, 2603 .doit = macsec_add_rxsc, 2604 .policy = macsec_genl_policy, 2605 .flags = GENL_ADMIN_PERM, 2606 }, 2607 { 2608 .cmd = MACSEC_CMD_DEL_RXSC, 2609 .doit = macsec_del_rxsc, 2610 .policy = macsec_genl_policy, 2611 .flags = GENL_ADMIN_PERM, 2612 }, 2613 { 2614 .cmd = MACSEC_CMD_UPD_RXSC, 2615 .doit = macsec_upd_rxsc, 2616 .policy = macsec_genl_policy, 2617 .flags = GENL_ADMIN_PERM, 2618 }, 2619 { 2620 .cmd = MACSEC_CMD_ADD_TXSA, 2621 .doit = macsec_add_txsa, 2622 .policy = macsec_genl_policy, 2623 .flags = GENL_ADMIN_PERM, 2624 }, 2625 { 2626 .cmd = MACSEC_CMD_DEL_TXSA, 2627 .doit = macsec_del_txsa, 2628 .policy = macsec_genl_policy, 2629 .flags = GENL_ADMIN_PERM, 2630 }, 2631 { 2632 .cmd = MACSEC_CMD_UPD_TXSA, 2633 .doit = macsec_upd_txsa, 2634 .policy = macsec_genl_policy, 2635 .flags = GENL_ADMIN_PERM, 2636 }, 2637 { 2638 .cmd = MACSEC_CMD_ADD_RXSA, 2639 .doit = macsec_add_rxsa, 2640 .policy = macsec_genl_policy, 2641 .flags = GENL_ADMIN_PERM, 2642 }, 2643 { 2644 .cmd = MACSEC_CMD_DEL_RXSA, 2645 .doit = macsec_del_rxsa, 2646 .policy = macsec_genl_policy, 2647 .flags = GENL_ADMIN_PERM, 2648 }, 2649 { 2650 .cmd = MACSEC_CMD_UPD_RXSA, 2651 .doit = macsec_upd_rxsa, 2652 .policy = macsec_genl_policy, 2653 .flags = GENL_ADMIN_PERM, 2654 }, 2655 }; 2656 2657 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 2658 struct net_device *dev) 2659 { 2660 struct macsec_dev *macsec = netdev_priv(dev); 2661 struct macsec_secy *secy = &macsec->secy; 2662 struct pcpu_secy_stats *secy_stats; 2663 int ret, len; 2664 2665 /* 10.5 */ 2666 if (!secy->protect_frames) { 2667 secy_stats = this_cpu_ptr(macsec->stats); 2668 u64_stats_update_begin(&secy_stats->syncp); 2669 secy_stats->stats.OutPktsUntagged++; 2670 u64_stats_update_end(&secy_stats->syncp); 2671 skb->dev = macsec->real_dev; 2672 len = skb->len; 2673 ret = dev_queue_xmit(skb); 2674 count_tx(dev, ret, len); 2675 return ret; 2676 } 2677 2678 if (!secy->operational) { 2679 kfree_skb(skb); 2680 dev->stats.tx_dropped++; 2681 return NETDEV_TX_OK; 2682 } 2683 2684 skb = macsec_encrypt(skb, dev); 2685 if (IS_ERR(skb)) { 2686 if (PTR_ERR(skb) != -EINPROGRESS) 2687 dev->stats.tx_dropped++; 2688 return NETDEV_TX_OK; 2689 } 2690 2691 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 2692 2693 macsec_encrypt_finish(skb, dev); 2694 len = skb->len; 2695 ret = dev_queue_xmit(skb); 2696 count_tx(dev, ret, len); 2697 return ret; 2698 } 2699 2700 #define MACSEC_FEATURES \ 2701 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 2702 static int macsec_dev_init(struct net_device *dev) 2703 { 2704 struct macsec_dev *macsec = macsec_priv(dev); 2705 struct net_device *real_dev = macsec->real_dev; 2706 int err; 2707 2708 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2709 if (!dev->tstats) 2710 return -ENOMEM; 2711 2712 err = gro_cells_init(&macsec->gro_cells, dev); 2713 if (err) { 2714 free_percpu(dev->tstats); 2715 return err; 2716 } 2717 2718 dev->features = real_dev->features & MACSEC_FEATURES; 2719 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 2720 2721 dev->needed_headroom = real_dev->needed_headroom + 2722 MACSEC_NEEDED_HEADROOM; 2723 dev->needed_tailroom = real_dev->needed_tailroom + 2724 MACSEC_NEEDED_TAILROOM; 2725 2726 if (is_zero_ether_addr(dev->dev_addr)) 2727 eth_hw_addr_inherit(dev, real_dev); 2728 if (is_zero_ether_addr(dev->broadcast)) 2729 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 2730 2731 return 0; 2732 } 2733 2734 static void macsec_dev_uninit(struct net_device *dev) 2735 { 2736 struct macsec_dev *macsec = macsec_priv(dev); 2737 2738 gro_cells_destroy(&macsec->gro_cells); 2739 free_percpu(dev->tstats); 2740 } 2741 2742 static netdev_features_t macsec_fix_features(struct net_device *dev, 2743 netdev_features_t features) 2744 { 2745 struct macsec_dev *macsec = macsec_priv(dev); 2746 struct net_device *real_dev = macsec->real_dev; 2747 2748 features &= (real_dev->features & MACSEC_FEATURES) | 2749 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 2750 features |= NETIF_F_LLTX; 2751 2752 return features; 2753 } 2754 2755 static int macsec_dev_open(struct net_device *dev) 2756 { 2757 struct macsec_dev *macsec = macsec_priv(dev); 2758 struct net_device *real_dev = macsec->real_dev; 2759 int err; 2760 2761 if (!(real_dev->flags & IFF_UP)) 2762 return -ENETDOWN; 2763 2764 err = dev_uc_add(real_dev, dev->dev_addr); 2765 if (err < 0) 2766 return err; 2767 2768 if (dev->flags & IFF_ALLMULTI) { 2769 err = dev_set_allmulti(real_dev, 1); 2770 if (err < 0) 2771 goto del_unicast; 2772 } 2773 2774 if (dev->flags & IFF_PROMISC) { 2775 err = dev_set_promiscuity(real_dev, 1); 2776 if (err < 0) 2777 goto clear_allmulti; 2778 } 2779 2780 if (netif_carrier_ok(real_dev)) 2781 netif_carrier_on(dev); 2782 2783 return 0; 2784 clear_allmulti: 2785 if (dev->flags & IFF_ALLMULTI) 2786 dev_set_allmulti(real_dev, -1); 2787 del_unicast: 2788 dev_uc_del(real_dev, dev->dev_addr); 2789 netif_carrier_off(dev); 2790 return err; 2791 } 2792 2793 static int macsec_dev_stop(struct net_device *dev) 2794 { 2795 struct macsec_dev *macsec = macsec_priv(dev); 2796 struct net_device *real_dev = macsec->real_dev; 2797 2798 netif_carrier_off(dev); 2799 2800 dev_mc_unsync(real_dev, dev); 2801 dev_uc_unsync(real_dev, dev); 2802 2803 if (dev->flags & IFF_ALLMULTI) 2804 dev_set_allmulti(real_dev, -1); 2805 2806 if (dev->flags & IFF_PROMISC) 2807 dev_set_promiscuity(real_dev, -1); 2808 2809 dev_uc_del(real_dev, dev->dev_addr); 2810 2811 return 0; 2812 } 2813 2814 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 2815 { 2816 struct net_device *real_dev = macsec_priv(dev)->real_dev; 2817 2818 if (!(dev->flags & IFF_UP)) 2819 return; 2820 2821 if (change & IFF_ALLMULTI) 2822 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 2823 2824 if (change & IFF_PROMISC) 2825 dev_set_promiscuity(real_dev, 2826 dev->flags & IFF_PROMISC ? 1 : -1); 2827 } 2828 2829 static void macsec_dev_set_rx_mode(struct net_device *dev) 2830 { 2831 struct net_device *real_dev = macsec_priv(dev)->real_dev; 2832 2833 dev_mc_sync(real_dev, dev); 2834 dev_uc_sync(real_dev, dev); 2835 } 2836 2837 static int macsec_set_mac_address(struct net_device *dev, void *p) 2838 { 2839 struct macsec_dev *macsec = macsec_priv(dev); 2840 struct net_device *real_dev = macsec->real_dev; 2841 struct sockaddr *addr = p; 2842 int err; 2843 2844 if (!is_valid_ether_addr(addr->sa_data)) 2845 return -EADDRNOTAVAIL; 2846 2847 if (!(dev->flags & IFF_UP)) 2848 goto out; 2849 2850 err = dev_uc_add(real_dev, addr->sa_data); 2851 if (err < 0) 2852 return err; 2853 2854 dev_uc_del(real_dev, dev->dev_addr); 2855 2856 out: 2857 ether_addr_copy(dev->dev_addr, addr->sa_data); 2858 return 0; 2859 } 2860 2861 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 2862 { 2863 struct macsec_dev *macsec = macsec_priv(dev); 2864 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 2865 2866 if (macsec->real_dev->mtu - extra < new_mtu) 2867 return -ERANGE; 2868 2869 dev->mtu = new_mtu; 2870 2871 return 0; 2872 } 2873 2874 static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev, 2875 struct rtnl_link_stats64 *s) 2876 { 2877 int cpu; 2878 2879 if (!dev->tstats) 2880 return s; 2881 2882 for_each_possible_cpu(cpu) { 2883 struct pcpu_sw_netstats *stats; 2884 struct pcpu_sw_netstats tmp; 2885 int start; 2886 2887 stats = per_cpu_ptr(dev->tstats, cpu); 2888 do { 2889 start = u64_stats_fetch_begin_irq(&stats->syncp); 2890 tmp.rx_packets = stats->rx_packets; 2891 tmp.rx_bytes = stats->rx_bytes; 2892 tmp.tx_packets = stats->tx_packets; 2893 tmp.tx_bytes = stats->tx_bytes; 2894 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2895 2896 s->rx_packets += tmp.rx_packets; 2897 s->rx_bytes += tmp.rx_bytes; 2898 s->tx_packets += tmp.tx_packets; 2899 s->tx_bytes += tmp.tx_bytes; 2900 } 2901 2902 s->rx_dropped = dev->stats.rx_dropped; 2903 s->tx_dropped = dev->stats.tx_dropped; 2904 2905 return s; 2906 } 2907 2908 static int macsec_get_iflink(const struct net_device *dev) 2909 { 2910 return macsec_priv(dev)->real_dev->ifindex; 2911 } 2912 2913 static const struct net_device_ops macsec_netdev_ops = { 2914 .ndo_init = macsec_dev_init, 2915 .ndo_uninit = macsec_dev_uninit, 2916 .ndo_open = macsec_dev_open, 2917 .ndo_stop = macsec_dev_stop, 2918 .ndo_fix_features = macsec_fix_features, 2919 .ndo_change_mtu = macsec_change_mtu, 2920 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 2921 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 2922 .ndo_set_mac_address = macsec_set_mac_address, 2923 .ndo_start_xmit = macsec_start_xmit, 2924 .ndo_get_stats64 = macsec_get_stats64, 2925 .ndo_get_iflink = macsec_get_iflink, 2926 }; 2927 2928 static const struct device_type macsec_type = { 2929 .name = "macsec", 2930 }; 2931 2932 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 2933 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 2934 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 2935 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 2936 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 2937 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 2938 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 2939 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 2940 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 2941 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 2942 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 2943 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 2944 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 2945 }; 2946 2947 static void macsec_free_netdev(struct net_device *dev) 2948 { 2949 struct macsec_dev *macsec = macsec_priv(dev); 2950 struct net_device *real_dev = macsec->real_dev; 2951 2952 free_percpu(macsec->stats); 2953 free_percpu(macsec->secy.tx_sc.stats); 2954 2955 dev_put(real_dev); 2956 free_netdev(dev); 2957 } 2958 2959 static void macsec_setup(struct net_device *dev) 2960 { 2961 ether_setup(dev); 2962 dev->priv_flags |= IFF_NO_QUEUE; 2963 dev->netdev_ops = &macsec_netdev_ops; 2964 dev->destructor = macsec_free_netdev; 2965 2966 eth_zero_addr(dev->broadcast); 2967 } 2968 2969 static void macsec_changelink_common(struct net_device *dev, 2970 struct nlattr *data[]) 2971 { 2972 struct macsec_secy *secy; 2973 struct macsec_tx_sc *tx_sc; 2974 2975 secy = &macsec_priv(dev)->secy; 2976 tx_sc = &secy->tx_sc; 2977 2978 if (data[IFLA_MACSEC_ENCODING_SA]) { 2979 struct macsec_tx_sa *tx_sa; 2980 2981 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 2982 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 2983 2984 secy->operational = tx_sa && tx_sa->active; 2985 } 2986 2987 if (data[IFLA_MACSEC_WINDOW]) 2988 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 2989 2990 if (data[IFLA_MACSEC_ENCRYPT]) 2991 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 2992 2993 if (data[IFLA_MACSEC_PROTECT]) 2994 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 2995 2996 if (data[IFLA_MACSEC_INC_SCI]) 2997 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 2998 2999 if (data[IFLA_MACSEC_ES]) 3000 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3001 3002 if (data[IFLA_MACSEC_SCB]) 3003 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3004 3005 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3006 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3007 3008 if (data[IFLA_MACSEC_VALIDATION]) 3009 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3010 } 3011 3012 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3013 struct nlattr *data[]) 3014 { 3015 if (!data) 3016 return 0; 3017 3018 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3019 data[IFLA_MACSEC_ICV_LEN] || 3020 data[IFLA_MACSEC_SCI] || 3021 data[IFLA_MACSEC_PORT]) 3022 return -EINVAL; 3023 3024 macsec_changelink_common(dev, data); 3025 3026 return 0; 3027 } 3028 3029 static void macsec_del_dev(struct macsec_dev *macsec) 3030 { 3031 int i; 3032 3033 while (macsec->secy.rx_sc) { 3034 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 3035 3036 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 3037 free_rx_sc(rx_sc); 3038 } 3039 3040 for (i = 0; i < MACSEC_NUM_AN; i++) { 3041 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 3042 3043 if (sa) { 3044 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 3045 clear_tx_sa(sa); 3046 } 3047 } 3048 } 3049 3050 static void macsec_dellink(struct net_device *dev, struct list_head *head) 3051 { 3052 struct macsec_dev *macsec = macsec_priv(dev); 3053 struct net_device *real_dev = macsec->real_dev; 3054 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3055 3056 macsec_generation++; 3057 3058 unregister_netdevice_queue(dev, head); 3059 list_del_rcu(&macsec->secys); 3060 if (list_empty(&rxd->secys)) { 3061 netdev_rx_handler_unregister(real_dev); 3062 kfree(rxd); 3063 } 3064 3065 macsec_del_dev(macsec); 3066 } 3067 3068 static int register_macsec_dev(struct net_device *real_dev, 3069 struct net_device *dev) 3070 { 3071 struct macsec_dev *macsec = macsec_priv(dev); 3072 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3073 3074 if (!rxd) { 3075 int err; 3076 3077 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 3078 if (!rxd) 3079 return -ENOMEM; 3080 3081 INIT_LIST_HEAD(&rxd->secys); 3082 3083 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 3084 rxd); 3085 if (err < 0) { 3086 kfree(rxd); 3087 return err; 3088 } 3089 } 3090 3091 list_add_tail_rcu(&macsec->secys, &rxd->secys); 3092 return 0; 3093 } 3094 3095 static bool sci_exists(struct net_device *dev, sci_t sci) 3096 { 3097 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 3098 struct macsec_dev *macsec; 3099 3100 list_for_each_entry(macsec, &rxd->secys, secys) { 3101 if (macsec->secy.sci == sci) 3102 return true; 3103 } 3104 3105 return false; 3106 } 3107 3108 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 3109 { 3110 return make_sci(dev->dev_addr, port); 3111 } 3112 3113 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 3114 { 3115 struct macsec_dev *macsec = macsec_priv(dev); 3116 struct macsec_secy *secy = &macsec->secy; 3117 3118 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 3119 if (!macsec->stats) 3120 return -ENOMEM; 3121 3122 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 3123 if (!secy->tx_sc.stats) { 3124 free_percpu(macsec->stats); 3125 return -ENOMEM; 3126 } 3127 3128 if (sci == MACSEC_UNDEF_SCI) 3129 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3130 3131 secy->netdev = dev; 3132 secy->operational = true; 3133 secy->key_len = DEFAULT_SAK_LEN; 3134 secy->icv_len = icv_len; 3135 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 3136 secy->protect_frames = true; 3137 secy->replay_protect = false; 3138 3139 secy->sci = sci; 3140 secy->tx_sc.active = true; 3141 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 3142 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 3143 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 3144 secy->tx_sc.end_station = false; 3145 secy->tx_sc.scb = false; 3146 3147 return 0; 3148 } 3149 3150 static int macsec_newlink(struct net *net, struct net_device *dev, 3151 struct nlattr *tb[], struct nlattr *data[]) 3152 { 3153 struct macsec_dev *macsec = macsec_priv(dev); 3154 struct net_device *real_dev; 3155 int err; 3156 sci_t sci; 3157 u8 icv_len = DEFAULT_ICV_LEN; 3158 rx_handler_func_t *rx_handler; 3159 3160 if (!tb[IFLA_LINK]) 3161 return -EINVAL; 3162 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 3163 if (!real_dev) 3164 return -ENODEV; 3165 3166 dev->priv_flags |= IFF_MACSEC; 3167 3168 macsec->real_dev = real_dev; 3169 3170 if (data && data[IFLA_MACSEC_ICV_LEN]) 3171 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3172 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 3173 3174 rx_handler = rtnl_dereference(real_dev->rx_handler); 3175 if (rx_handler && rx_handler != macsec_handle_frame) 3176 return -EBUSY; 3177 3178 err = register_netdevice(dev); 3179 if (err < 0) 3180 return err; 3181 3182 dev_hold(real_dev); 3183 3184 /* need to be already registered so that ->init has run and 3185 * the MAC addr is set 3186 */ 3187 if (data && data[IFLA_MACSEC_SCI]) 3188 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 3189 else if (data && data[IFLA_MACSEC_PORT]) 3190 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 3191 else 3192 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3193 3194 if (rx_handler && sci_exists(real_dev, sci)) { 3195 err = -EBUSY; 3196 goto unregister; 3197 } 3198 3199 err = macsec_add_dev(dev, sci, icv_len); 3200 if (err) 3201 goto unregister; 3202 3203 if (data) 3204 macsec_changelink_common(dev, data); 3205 3206 err = register_macsec_dev(real_dev, dev); 3207 if (err < 0) 3208 goto del_dev; 3209 3210 macsec_generation++; 3211 3212 return 0; 3213 3214 del_dev: 3215 macsec_del_dev(macsec); 3216 unregister: 3217 unregister_netdevice(dev); 3218 return err; 3219 } 3220 3221 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[]) 3222 { 3223 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 3224 u8 icv_len = DEFAULT_ICV_LEN; 3225 int flag; 3226 bool es, scb, sci; 3227 3228 if (!data) 3229 return 0; 3230 3231 if (data[IFLA_MACSEC_CIPHER_SUITE]) 3232 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 3233 3234 if (data[IFLA_MACSEC_ICV_LEN]) { 3235 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3236 if (icv_len != DEFAULT_ICV_LEN) { 3237 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 3238 struct crypto_aead *dummy_tfm; 3239 3240 dummy_tfm = macsec_alloc_tfm(dummy_key, 3241 DEFAULT_SAK_LEN, 3242 icv_len); 3243 if (IS_ERR(dummy_tfm)) 3244 return PTR_ERR(dummy_tfm); 3245 crypto_free_aead(dummy_tfm); 3246 } 3247 } 3248 3249 switch (csid) { 3250 case MACSEC_DEFAULT_CIPHER_ID: 3251 case MACSEC_DEFAULT_CIPHER_ALT: 3252 if (icv_len < MACSEC_MIN_ICV_LEN || 3253 icv_len > MACSEC_STD_ICV_LEN) 3254 return -EINVAL; 3255 break; 3256 default: 3257 return -EINVAL; 3258 } 3259 3260 if (data[IFLA_MACSEC_ENCODING_SA]) { 3261 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 3262 return -EINVAL; 3263 } 3264 3265 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 3266 flag < IFLA_MACSEC_VALIDATION; 3267 flag++) { 3268 if (data[flag]) { 3269 if (nla_get_u8(data[flag]) > 1) 3270 return -EINVAL; 3271 } 3272 } 3273 3274 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 3275 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 3276 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 3277 3278 if ((sci && (scb || es)) || (scb && es)) 3279 return -EINVAL; 3280 3281 if (data[IFLA_MACSEC_VALIDATION] && 3282 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 3283 return -EINVAL; 3284 3285 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 3286 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 3287 !data[IFLA_MACSEC_WINDOW]) 3288 return -EINVAL; 3289 3290 return 0; 3291 } 3292 3293 static struct net *macsec_get_link_net(const struct net_device *dev) 3294 { 3295 return dev_net(macsec_priv(dev)->real_dev); 3296 } 3297 3298 static size_t macsec_get_size(const struct net_device *dev) 3299 { 3300 return 0 + 3301 nla_total_size_64bit(8) + /* SCI */ 3302 nla_total_size(1) + /* ICV_LEN */ 3303 nla_total_size_64bit(8) + /* CIPHER_SUITE */ 3304 nla_total_size(4) + /* WINDOW */ 3305 nla_total_size(1) + /* ENCODING_SA */ 3306 nla_total_size(1) + /* ENCRYPT */ 3307 nla_total_size(1) + /* PROTECT */ 3308 nla_total_size(1) + /* INC_SCI */ 3309 nla_total_size(1) + /* ES */ 3310 nla_total_size(1) + /* SCB */ 3311 nla_total_size(1) + /* REPLAY_PROTECT */ 3312 nla_total_size(1) + /* VALIDATION */ 3313 0; 3314 } 3315 3316 static int macsec_fill_info(struct sk_buff *skb, 3317 const struct net_device *dev) 3318 { 3319 struct macsec_secy *secy = &macsec_priv(dev)->secy; 3320 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3321 3322 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 3323 IFLA_MACSEC_PAD) || 3324 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 3325 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 3326 MACSEC_DEFAULT_CIPHER_ID, IFLA_MACSEC_PAD) || 3327 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 3328 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 3329 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 3330 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 3331 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 3332 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 3333 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 3334 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 3335 0) 3336 goto nla_put_failure; 3337 3338 if (secy->replay_protect) { 3339 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 3340 goto nla_put_failure; 3341 } 3342 3343 return 0; 3344 3345 nla_put_failure: 3346 return -EMSGSIZE; 3347 } 3348 3349 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 3350 .kind = "macsec", 3351 .priv_size = sizeof(struct macsec_dev), 3352 .maxtype = IFLA_MACSEC_MAX, 3353 .policy = macsec_rtnl_policy, 3354 .setup = macsec_setup, 3355 .validate = macsec_validate_attr, 3356 .newlink = macsec_newlink, 3357 .changelink = macsec_changelink, 3358 .dellink = macsec_dellink, 3359 .get_size = macsec_get_size, 3360 .fill_info = macsec_fill_info, 3361 .get_link_net = macsec_get_link_net, 3362 }; 3363 3364 static bool is_macsec_master(struct net_device *dev) 3365 { 3366 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 3367 } 3368 3369 static int macsec_notify(struct notifier_block *this, unsigned long event, 3370 void *ptr) 3371 { 3372 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 3373 LIST_HEAD(head); 3374 3375 if (!is_macsec_master(real_dev)) 3376 return NOTIFY_DONE; 3377 3378 switch (event) { 3379 case NETDEV_UNREGISTER: { 3380 struct macsec_dev *m, *n; 3381 struct macsec_rxh_data *rxd; 3382 3383 rxd = macsec_data_rtnl(real_dev); 3384 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 3385 macsec_dellink(m->secy.netdev, &head); 3386 } 3387 unregister_netdevice_many(&head); 3388 break; 3389 } 3390 case NETDEV_CHANGEMTU: { 3391 struct macsec_dev *m; 3392 struct macsec_rxh_data *rxd; 3393 3394 rxd = macsec_data_rtnl(real_dev); 3395 list_for_each_entry(m, &rxd->secys, secys) { 3396 struct net_device *dev = m->secy.netdev; 3397 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 3398 macsec_extra_len(true)); 3399 3400 if (dev->mtu > mtu) 3401 dev_set_mtu(dev, mtu); 3402 } 3403 } 3404 } 3405 3406 return NOTIFY_OK; 3407 } 3408 3409 static struct notifier_block macsec_notifier = { 3410 .notifier_call = macsec_notify, 3411 }; 3412 3413 static int __init macsec_init(void) 3414 { 3415 int err; 3416 3417 pr_info("MACsec IEEE 802.1AE\n"); 3418 err = register_netdevice_notifier(&macsec_notifier); 3419 if (err) 3420 return err; 3421 3422 err = rtnl_link_register(&macsec_link_ops); 3423 if (err) 3424 goto notifier; 3425 3426 err = genl_register_family_with_ops(&macsec_fam, macsec_genl_ops); 3427 if (err) 3428 goto rtnl; 3429 3430 return 0; 3431 3432 rtnl: 3433 rtnl_link_unregister(&macsec_link_ops); 3434 notifier: 3435 unregister_netdevice_notifier(&macsec_notifier); 3436 return err; 3437 } 3438 3439 static void __exit macsec_exit(void) 3440 { 3441 genl_unregister_family(&macsec_fam); 3442 rtnl_link_unregister(&macsec_link_ops); 3443 unregister_netdevice_notifier(&macsec_notifier); 3444 rcu_barrier(); 3445 } 3446 3447 module_init(macsec_init); 3448 module_exit(macsec_exit); 3449 3450 MODULE_ALIAS_RTNL_LINK("macsec"); 3451 3452 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 3453 MODULE_LICENSE("GPL v2"); 3454