1 /* 2 * drivers/net/macsec.c - MACsec device 3 * 4 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 */ 11 12 #include <linux/types.h> 13 #include <linux/skbuff.h> 14 #include <linux/socket.h> 15 #include <linux/module.h> 16 #include <crypto/aead.h> 17 #include <linux/etherdevice.h> 18 #include <linux/rtnetlink.h> 19 #include <net/genetlink.h> 20 #include <net/sock.h> 21 #include <net/gro_cells.h> 22 23 #include <uapi/linux/if_macsec.h> 24 25 typedef u64 __bitwise sci_t; 26 27 #define MACSEC_SCI_LEN 8 28 29 /* SecTAG length = macsec_eth_header without the optional SCI */ 30 #define MACSEC_TAG_LEN 6 31 32 struct macsec_eth_header { 33 struct ethhdr eth; 34 /* SecTAG */ 35 u8 tci_an; 36 #if defined(__LITTLE_ENDIAN_BITFIELD) 37 u8 short_length:6, 38 unused:2; 39 #elif defined(__BIG_ENDIAN_BITFIELD) 40 u8 unused:2, 41 short_length:6; 42 #else 43 #error "Please fix <asm/byteorder.h>" 44 #endif 45 __be32 packet_number; 46 u8 secure_channel_id[8]; /* optional */ 47 } __packed; 48 49 #define MACSEC_TCI_VERSION 0x80 50 #define MACSEC_TCI_ES 0x40 /* end station */ 51 #define MACSEC_TCI_SC 0x20 /* SCI present */ 52 #define MACSEC_TCI_SCB 0x10 /* epon */ 53 #define MACSEC_TCI_E 0x08 /* encryption */ 54 #define MACSEC_TCI_C 0x04 /* changed text */ 55 #define MACSEC_AN_MASK 0x03 /* association number */ 56 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C) 57 58 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */ 59 #define MIN_NON_SHORT_LEN 48 60 61 #define GCM_AES_IV_LEN 12 62 #define DEFAULT_ICV_LEN 16 63 64 #define MACSEC_NUM_AN 4 /* 2 bits for the association number */ 65 66 #define for_each_rxsc(secy, sc) \ 67 for (sc = rcu_dereference_bh(secy->rx_sc); \ 68 sc; \ 69 sc = rcu_dereference_bh(sc->next)) 70 #define for_each_rxsc_rtnl(secy, sc) \ 71 for (sc = rtnl_dereference(secy->rx_sc); \ 72 sc; \ 73 sc = rtnl_dereference(sc->next)) 74 75 struct gcm_iv { 76 union { 77 u8 secure_channel_id[8]; 78 sci_t sci; 79 }; 80 __be32 pn; 81 }; 82 83 /** 84 * struct macsec_key - SA key 85 * @id: user-provided key identifier 86 * @tfm: crypto struct, key storage 87 */ 88 struct macsec_key { 89 u8 id[MACSEC_KEYID_LEN]; 90 struct crypto_aead *tfm; 91 }; 92 93 struct macsec_rx_sc_stats { 94 __u64 InOctetsValidated; 95 __u64 InOctetsDecrypted; 96 __u64 InPktsUnchecked; 97 __u64 InPktsDelayed; 98 __u64 InPktsOK; 99 __u64 InPktsInvalid; 100 __u64 InPktsLate; 101 __u64 InPktsNotValid; 102 __u64 InPktsNotUsingSA; 103 __u64 InPktsUnusedSA; 104 }; 105 106 struct macsec_rx_sa_stats { 107 __u32 InPktsOK; 108 __u32 InPktsInvalid; 109 __u32 InPktsNotValid; 110 __u32 InPktsNotUsingSA; 111 __u32 InPktsUnusedSA; 112 }; 113 114 struct macsec_tx_sa_stats { 115 __u32 OutPktsProtected; 116 __u32 OutPktsEncrypted; 117 }; 118 119 struct macsec_tx_sc_stats { 120 __u64 OutPktsProtected; 121 __u64 OutPktsEncrypted; 122 __u64 OutOctetsProtected; 123 __u64 OutOctetsEncrypted; 124 }; 125 126 struct macsec_dev_stats { 127 __u64 OutPktsUntagged; 128 __u64 InPktsUntagged; 129 __u64 OutPktsTooLong; 130 __u64 InPktsNoTag; 131 __u64 InPktsBadTag; 132 __u64 InPktsUnknownSCI; 133 __u64 InPktsNoSCI; 134 __u64 InPktsOverrun; 135 }; 136 137 /** 138 * struct macsec_rx_sa - receive secure association 139 * @active: 140 * @next_pn: packet number expected for the next packet 141 * @lock: protects next_pn manipulations 142 * @key: key structure 143 * @stats: per-SA stats 144 */ 145 struct macsec_rx_sa { 146 struct macsec_key key; 147 spinlock_t lock; 148 u32 next_pn; 149 atomic_t refcnt; 150 bool active; 151 struct macsec_rx_sa_stats __percpu *stats; 152 struct macsec_rx_sc *sc; 153 struct rcu_head rcu; 154 }; 155 156 struct pcpu_rx_sc_stats { 157 struct macsec_rx_sc_stats stats; 158 struct u64_stats_sync syncp; 159 }; 160 161 /** 162 * struct macsec_rx_sc - receive secure channel 163 * @sci: secure channel identifier for this SC 164 * @active: channel is active 165 * @sa: array of secure associations 166 * @stats: per-SC stats 167 */ 168 struct macsec_rx_sc { 169 struct macsec_rx_sc __rcu *next; 170 sci_t sci; 171 bool active; 172 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN]; 173 struct pcpu_rx_sc_stats __percpu *stats; 174 atomic_t refcnt; 175 struct rcu_head rcu_head; 176 }; 177 178 /** 179 * struct macsec_tx_sa - transmit secure association 180 * @active: 181 * @next_pn: packet number to use for the next packet 182 * @lock: protects next_pn manipulations 183 * @key: key structure 184 * @stats: per-SA stats 185 */ 186 struct macsec_tx_sa { 187 struct macsec_key key; 188 spinlock_t lock; 189 u32 next_pn; 190 atomic_t refcnt; 191 bool active; 192 struct macsec_tx_sa_stats __percpu *stats; 193 struct rcu_head rcu; 194 }; 195 196 struct pcpu_tx_sc_stats { 197 struct macsec_tx_sc_stats stats; 198 struct u64_stats_sync syncp; 199 }; 200 201 /** 202 * struct macsec_tx_sc - transmit secure channel 203 * @active: 204 * @encoding_sa: association number of the SA currently in use 205 * @encrypt: encrypt packets on transmit, or authenticate only 206 * @send_sci: always include the SCI in the SecTAG 207 * @end_station: 208 * @scb: single copy broadcast flag 209 * @sa: array of secure associations 210 * @stats: stats for this TXSC 211 */ 212 struct macsec_tx_sc { 213 bool active; 214 u8 encoding_sa; 215 bool encrypt; 216 bool send_sci; 217 bool end_station; 218 bool scb; 219 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN]; 220 struct pcpu_tx_sc_stats __percpu *stats; 221 }; 222 223 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT 224 225 /** 226 * struct macsec_secy - MACsec Security Entity 227 * @netdev: netdevice for this SecY 228 * @n_rx_sc: number of receive secure channels configured on this SecY 229 * @sci: secure channel identifier used for tx 230 * @key_len: length of keys used by the cipher suite 231 * @icv_len: length of ICV used by the cipher suite 232 * @validate_frames: validation mode 233 * @operational: MAC_Operational flag 234 * @protect_frames: enable protection for this SecY 235 * @replay_protect: enable packet number checks on receive 236 * @replay_window: size of the replay window 237 * @tx_sc: transmit secure channel 238 * @rx_sc: linked list of receive secure channels 239 */ 240 struct macsec_secy { 241 struct net_device *netdev; 242 unsigned int n_rx_sc; 243 sci_t sci; 244 u16 key_len; 245 u16 icv_len; 246 enum macsec_validation_type validate_frames; 247 bool operational; 248 bool protect_frames; 249 bool replay_protect; 250 u32 replay_window; 251 struct macsec_tx_sc tx_sc; 252 struct macsec_rx_sc __rcu *rx_sc; 253 }; 254 255 struct pcpu_secy_stats { 256 struct macsec_dev_stats stats; 257 struct u64_stats_sync syncp; 258 }; 259 260 /** 261 * struct macsec_dev - private data 262 * @secy: SecY config 263 * @real_dev: pointer to underlying netdevice 264 * @stats: MACsec device stats 265 * @secys: linked list of SecY's on the underlying device 266 */ 267 struct macsec_dev { 268 struct macsec_secy secy; 269 struct net_device *real_dev; 270 struct pcpu_secy_stats __percpu *stats; 271 struct list_head secys; 272 struct gro_cells gro_cells; 273 unsigned int nest_level; 274 }; 275 276 /** 277 * struct macsec_rxh_data - rx_handler private argument 278 * @secys: linked list of SecY's on this underlying device 279 */ 280 struct macsec_rxh_data { 281 struct list_head secys; 282 }; 283 284 static struct macsec_dev *macsec_priv(const struct net_device *dev) 285 { 286 return (struct macsec_dev *)netdev_priv(dev); 287 } 288 289 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev) 290 { 291 return rcu_dereference_bh(dev->rx_handler_data); 292 } 293 294 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev) 295 { 296 return rtnl_dereference(dev->rx_handler_data); 297 } 298 299 struct macsec_cb { 300 struct aead_request *req; 301 union { 302 struct macsec_tx_sa *tx_sa; 303 struct macsec_rx_sa *rx_sa; 304 }; 305 u8 assoc_num; 306 bool valid; 307 bool has_sci; 308 }; 309 310 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr) 311 { 312 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr); 313 314 if (!sa || !sa->active) 315 return NULL; 316 317 if (!atomic_inc_not_zero(&sa->refcnt)) 318 return NULL; 319 320 return sa; 321 } 322 323 static void free_rx_sc_rcu(struct rcu_head *head) 324 { 325 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head); 326 327 free_percpu(rx_sc->stats); 328 kfree(rx_sc); 329 } 330 331 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc) 332 { 333 return atomic_inc_not_zero(&sc->refcnt) ? sc : NULL; 334 } 335 336 static void macsec_rxsc_put(struct macsec_rx_sc *sc) 337 { 338 if (atomic_dec_and_test(&sc->refcnt)) 339 call_rcu(&sc->rcu_head, free_rx_sc_rcu); 340 } 341 342 static void free_rxsa(struct rcu_head *head) 343 { 344 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu); 345 346 crypto_free_aead(sa->key.tfm); 347 free_percpu(sa->stats); 348 kfree(sa); 349 } 350 351 static void macsec_rxsa_put(struct macsec_rx_sa *sa) 352 { 353 if (atomic_dec_and_test(&sa->refcnt)) 354 call_rcu(&sa->rcu, free_rxsa); 355 } 356 357 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr) 358 { 359 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr); 360 361 if (!sa || !sa->active) 362 return NULL; 363 364 if (!atomic_inc_not_zero(&sa->refcnt)) 365 return NULL; 366 367 return sa; 368 } 369 370 static void free_txsa(struct rcu_head *head) 371 { 372 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu); 373 374 crypto_free_aead(sa->key.tfm); 375 free_percpu(sa->stats); 376 kfree(sa); 377 } 378 379 static void macsec_txsa_put(struct macsec_tx_sa *sa) 380 { 381 if (atomic_dec_and_test(&sa->refcnt)) 382 call_rcu(&sa->rcu, free_txsa); 383 } 384 385 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) 386 { 387 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); 388 return (struct macsec_cb *)skb->cb; 389 } 390 391 #define MACSEC_PORT_ES (htons(0x0001)) 392 #define MACSEC_PORT_SCB (0x0000) 393 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL) 394 395 #define DEFAULT_SAK_LEN 16 396 #define DEFAULT_SEND_SCI true 397 #define DEFAULT_ENCRYPT false 398 #define DEFAULT_ENCODING_SA 0 399 400 static bool send_sci(const struct macsec_secy *secy) 401 { 402 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 403 404 return tx_sc->send_sci || 405 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb); 406 } 407 408 static sci_t make_sci(u8 *addr, __be16 port) 409 { 410 sci_t sci; 411 412 memcpy(&sci, addr, ETH_ALEN); 413 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); 414 415 return sci; 416 } 417 418 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present) 419 { 420 sci_t sci; 421 422 if (sci_present) 423 memcpy(&sci, hdr->secure_channel_id, 424 sizeof(hdr->secure_channel_id)); 425 else 426 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); 427 428 return sci; 429 } 430 431 static unsigned int macsec_sectag_len(bool sci_present) 432 { 433 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); 434 } 435 436 static unsigned int macsec_hdr_len(bool sci_present) 437 { 438 return macsec_sectag_len(sci_present) + ETH_HLEN; 439 } 440 441 static unsigned int macsec_extra_len(bool sci_present) 442 { 443 return macsec_sectag_len(sci_present) + sizeof(__be16); 444 } 445 446 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ 447 static void macsec_fill_sectag(struct macsec_eth_header *h, 448 const struct macsec_secy *secy, u32 pn, 449 bool sci_present) 450 { 451 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 452 453 memset(&h->tci_an, 0, macsec_sectag_len(sci_present)); 454 h->eth.h_proto = htons(ETH_P_MACSEC); 455 456 if (sci_present) { 457 h->tci_an |= MACSEC_TCI_SC; 458 memcpy(&h->secure_channel_id, &secy->sci, 459 sizeof(h->secure_channel_id)); 460 } else { 461 if (tx_sc->end_station) 462 h->tci_an |= MACSEC_TCI_ES; 463 if (tx_sc->scb) 464 h->tci_an |= MACSEC_TCI_SCB; 465 } 466 467 h->packet_number = htonl(pn); 468 469 /* with GCM, C/E clear for !encrypt, both set for encrypt */ 470 if (tx_sc->encrypt) 471 h->tci_an |= MACSEC_TCI_CONFID; 472 else if (secy->icv_len != DEFAULT_ICV_LEN) 473 h->tci_an |= MACSEC_TCI_C; 474 475 h->tci_an |= tx_sc->encoding_sa; 476 } 477 478 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) 479 { 480 if (data_len < MIN_NON_SHORT_LEN) 481 h->short_length = data_len; 482 } 483 484 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */ 485 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len) 486 { 487 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; 488 int len = skb->len - 2 * ETH_ALEN; 489 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; 490 491 /* a) It comprises at least 17 octets */ 492 if (skb->len <= 16) 493 return false; 494 495 /* b) MACsec EtherType: already checked */ 496 497 /* c) V bit is clear */ 498 if (h->tci_an & MACSEC_TCI_VERSION) 499 return false; 500 501 /* d) ES or SCB => !SC */ 502 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && 503 (h->tci_an & MACSEC_TCI_SC)) 504 return false; 505 506 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ 507 if (h->unused) 508 return false; 509 510 /* rx.pn != 0 (figure 10-5) */ 511 if (!h->packet_number) 512 return false; 513 514 /* length check, f) g) h) i) */ 515 if (h->short_length) 516 return len == extra_len + h->short_length; 517 return len >= extra_len + MIN_NON_SHORT_LEN; 518 } 519 520 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) 521 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN 522 523 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) 524 { 525 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; 526 527 gcm_iv->sci = sci; 528 gcm_iv->pn = htonl(pn); 529 } 530 531 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) 532 { 533 return (struct macsec_eth_header *)skb_mac_header(skb); 534 } 535 536 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy) 537 { 538 u32 pn; 539 540 spin_lock_bh(&tx_sa->lock); 541 pn = tx_sa->next_pn; 542 543 tx_sa->next_pn++; 544 if (tx_sa->next_pn == 0) { 545 pr_debug("PN wrapped, transitioning to !oper\n"); 546 tx_sa->active = false; 547 if (secy->protect_frames) 548 secy->operational = false; 549 } 550 spin_unlock_bh(&tx_sa->lock); 551 552 return pn; 553 } 554 555 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) 556 { 557 struct macsec_dev *macsec = netdev_priv(dev); 558 559 skb->dev = macsec->real_dev; 560 skb_reset_mac_header(skb); 561 skb->protocol = eth_hdr(skb)->h_proto; 562 } 563 564 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, 565 struct macsec_tx_sa *tx_sa) 566 { 567 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); 568 569 u64_stats_update_begin(&txsc_stats->syncp); 570 if (tx_sc->encrypt) { 571 txsc_stats->stats.OutOctetsEncrypted += skb->len; 572 txsc_stats->stats.OutPktsEncrypted++; 573 this_cpu_inc(tx_sa->stats->OutPktsEncrypted); 574 } else { 575 txsc_stats->stats.OutOctetsProtected += skb->len; 576 txsc_stats->stats.OutPktsProtected++; 577 this_cpu_inc(tx_sa->stats->OutPktsProtected); 578 } 579 u64_stats_update_end(&txsc_stats->syncp); 580 } 581 582 static void count_tx(struct net_device *dev, int ret, int len) 583 { 584 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 585 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 586 587 u64_stats_update_begin(&stats->syncp); 588 stats->tx_packets++; 589 stats->tx_bytes += len; 590 u64_stats_update_end(&stats->syncp); 591 } else { 592 dev->stats.tx_dropped++; 593 } 594 } 595 596 static void macsec_encrypt_done(struct crypto_async_request *base, int err) 597 { 598 struct sk_buff *skb = base->data; 599 struct net_device *dev = skb->dev; 600 struct macsec_dev *macsec = macsec_priv(dev); 601 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 602 int len, ret; 603 604 aead_request_free(macsec_skb_cb(skb)->req); 605 606 rcu_read_lock_bh(); 607 macsec_encrypt_finish(skb, dev); 608 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 609 len = skb->len; 610 ret = dev_queue_xmit(skb); 611 count_tx(dev, ret, len); 612 rcu_read_unlock_bh(); 613 614 macsec_txsa_put(sa); 615 dev_put(dev); 616 } 617 618 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, 619 unsigned char **iv, 620 struct scatterlist **sg) 621 { 622 size_t size, iv_offset, sg_offset; 623 struct aead_request *req; 624 void *tmp; 625 626 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); 627 iv_offset = size; 628 size += GCM_AES_IV_LEN; 629 630 size = ALIGN(size, __alignof__(struct scatterlist)); 631 sg_offset = size; 632 size += sizeof(struct scatterlist) * (MAX_SKB_FRAGS + 1); 633 634 tmp = kmalloc(size, GFP_ATOMIC); 635 if (!tmp) 636 return NULL; 637 638 *iv = (unsigned char *)(tmp + iv_offset); 639 *sg = (struct scatterlist *)(tmp + sg_offset); 640 req = tmp; 641 642 aead_request_set_tfm(req, tfm); 643 644 return req; 645 } 646 647 static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 648 struct net_device *dev) 649 { 650 int ret; 651 struct scatterlist *sg; 652 unsigned char *iv; 653 struct ethhdr *eth; 654 struct macsec_eth_header *hh; 655 size_t unprotected_len; 656 struct aead_request *req; 657 struct macsec_secy *secy; 658 struct macsec_tx_sc *tx_sc; 659 struct macsec_tx_sa *tx_sa; 660 struct macsec_dev *macsec = macsec_priv(dev); 661 bool sci_present; 662 u32 pn; 663 664 secy = &macsec->secy; 665 tx_sc = &secy->tx_sc; 666 667 /* 10.5.1 TX SA assignment */ 668 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); 669 if (!tx_sa) { 670 secy->operational = false; 671 kfree_skb(skb); 672 return ERR_PTR(-EINVAL); 673 } 674 675 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || 676 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { 677 struct sk_buff *nskb = skb_copy_expand(skb, 678 MACSEC_NEEDED_HEADROOM, 679 MACSEC_NEEDED_TAILROOM, 680 GFP_ATOMIC); 681 if (likely(nskb)) { 682 consume_skb(skb); 683 skb = nskb; 684 } else { 685 macsec_txsa_put(tx_sa); 686 kfree_skb(skb); 687 return ERR_PTR(-ENOMEM); 688 } 689 } else { 690 skb = skb_unshare(skb, GFP_ATOMIC); 691 if (!skb) { 692 macsec_txsa_put(tx_sa); 693 return ERR_PTR(-ENOMEM); 694 } 695 } 696 697 unprotected_len = skb->len; 698 eth = eth_hdr(skb); 699 sci_present = send_sci(secy); 700 hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(sci_present)); 701 memmove(hh, eth, 2 * ETH_ALEN); 702 703 pn = tx_sa_update_pn(tx_sa, secy); 704 if (pn == 0) { 705 macsec_txsa_put(tx_sa); 706 kfree_skb(skb); 707 return ERR_PTR(-ENOLINK); 708 } 709 macsec_fill_sectag(hh, secy, pn, sci_present); 710 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); 711 712 skb_put(skb, secy->icv_len); 713 714 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { 715 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 716 717 u64_stats_update_begin(&secy_stats->syncp); 718 secy_stats->stats.OutPktsTooLong++; 719 u64_stats_update_end(&secy_stats->syncp); 720 721 macsec_txsa_put(tx_sa); 722 kfree_skb(skb); 723 return ERR_PTR(-EINVAL); 724 } 725 726 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg); 727 if (!req) { 728 macsec_txsa_put(tx_sa); 729 kfree_skb(skb); 730 return ERR_PTR(-ENOMEM); 731 } 732 733 macsec_fill_iv(iv, secy->sci, pn); 734 735 sg_init_table(sg, MAX_SKB_FRAGS + 1); 736 skb_to_sgvec(skb, sg, 0, skb->len); 737 738 if (tx_sc->encrypt) { 739 int len = skb->len - macsec_hdr_len(sci_present) - 740 secy->icv_len; 741 aead_request_set_crypt(req, sg, sg, len, iv); 742 aead_request_set_ad(req, macsec_hdr_len(sci_present)); 743 } else { 744 aead_request_set_crypt(req, sg, sg, 0, iv); 745 aead_request_set_ad(req, skb->len - secy->icv_len); 746 } 747 748 macsec_skb_cb(skb)->req = req; 749 macsec_skb_cb(skb)->tx_sa = tx_sa; 750 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 751 752 dev_hold(skb->dev); 753 ret = crypto_aead_encrypt(req); 754 if (ret == -EINPROGRESS) { 755 return ERR_PTR(ret); 756 } else if (ret != 0) { 757 dev_put(skb->dev); 758 kfree_skb(skb); 759 aead_request_free(req); 760 macsec_txsa_put(tx_sa); 761 return ERR_PTR(-EINVAL); 762 } 763 764 dev_put(skb->dev); 765 aead_request_free(req); 766 macsec_txsa_put(tx_sa); 767 768 return skb; 769 } 770 771 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 772 { 773 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 774 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 775 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 776 u32 lowest_pn = 0; 777 778 spin_lock(&rx_sa->lock); 779 if (rx_sa->next_pn >= secy->replay_window) 780 lowest_pn = rx_sa->next_pn - secy->replay_window; 781 782 /* Now perform replay protection check again 783 * (see IEEE 802.1AE-2006 figure 10-5) 784 */ 785 if (secy->replay_protect && pn < lowest_pn) { 786 spin_unlock(&rx_sa->lock); 787 u64_stats_update_begin(&rxsc_stats->syncp); 788 rxsc_stats->stats.InPktsLate++; 789 u64_stats_update_end(&rxsc_stats->syncp); 790 return false; 791 } 792 793 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 794 u64_stats_update_begin(&rxsc_stats->syncp); 795 if (hdr->tci_an & MACSEC_TCI_E) 796 rxsc_stats->stats.InOctetsDecrypted += skb->len; 797 else 798 rxsc_stats->stats.InOctetsValidated += skb->len; 799 u64_stats_update_end(&rxsc_stats->syncp); 800 } 801 802 if (!macsec_skb_cb(skb)->valid) { 803 spin_unlock(&rx_sa->lock); 804 805 /* 10.6.5 */ 806 if (hdr->tci_an & MACSEC_TCI_C || 807 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 808 u64_stats_update_begin(&rxsc_stats->syncp); 809 rxsc_stats->stats.InPktsNotValid++; 810 u64_stats_update_end(&rxsc_stats->syncp); 811 return false; 812 } 813 814 u64_stats_update_begin(&rxsc_stats->syncp); 815 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 816 rxsc_stats->stats.InPktsInvalid++; 817 this_cpu_inc(rx_sa->stats->InPktsInvalid); 818 } else if (pn < lowest_pn) { 819 rxsc_stats->stats.InPktsDelayed++; 820 } else { 821 rxsc_stats->stats.InPktsUnchecked++; 822 } 823 u64_stats_update_end(&rxsc_stats->syncp); 824 } else { 825 u64_stats_update_begin(&rxsc_stats->syncp); 826 if (pn < lowest_pn) { 827 rxsc_stats->stats.InPktsDelayed++; 828 } else { 829 rxsc_stats->stats.InPktsOK++; 830 this_cpu_inc(rx_sa->stats->InPktsOK); 831 } 832 u64_stats_update_end(&rxsc_stats->syncp); 833 834 if (pn >= rx_sa->next_pn) 835 rx_sa->next_pn = pn + 1; 836 spin_unlock(&rx_sa->lock); 837 } 838 839 return true; 840 } 841 842 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 843 { 844 skb->pkt_type = PACKET_HOST; 845 skb->protocol = eth_type_trans(skb, dev); 846 847 skb_reset_network_header(skb); 848 if (!skb_transport_header_was_set(skb)) 849 skb_reset_transport_header(skb); 850 skb_reset_mac_len(skb); 851 } 852 853 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 854 { 855 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 856 skb_pull(skb, hdr_len); 857 pskb_trim_unique(skb, skb->len - icv_len); 858 } 859 860 static void count_rx(struct net_device *dev, int len) 861 { 862 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 863 864 u64_stats_update_begin(&stats->syncp); 865 stats->rx_packets++; 866 stats->rx_bytes += len; 867 u64_stats_update_end(&stats->syncp); 868 } 869 870 static void macsec_decrypt_done(struct crypto_async_request *base, int err) 871 { 872 struct sk_buff *skb = base->data; 873 struct net_device *dev = skb->dev; 874 struct macsec_dev *macsec = macsec_priv(dev); 875 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 876 struct macsec_rx_sc *rx_sc = rx_sa->sc; 877 int len, ret; 878 u32 pn; 879 880 aead_request_free(macsec_skb_cb(skb)->req); 881 882 if (!err) 883 macsec_skb_cb(skb)->valid = true; 884 885 rcu_read_lock_bh(); 886 pn = ntohl(macsec_ethhdr(skb)->packet_number); 887 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 888 rcu_read_unlock_bh(); 889 kfree_skb(skb); 890 goto out; 891 } 892 893 macsec_finalize_skb(skb, macsec->secy.icv_len, 894 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 895 macsec_reset_skb(skb, macsec->secy.netdev); 896 897 len = skb->len; 898 ret = gro_cells_receive(&macsec->gro_cells, skb); 899 if (ret == NET_RX_SUCCESS) 900 count_rx(dev, len); 901 else 902 macsec->secy.netdev->stats.rx_dropped++; 903 904 rcu_read_unlock_bh(); 905 906 out: 907 macsec_rxsa_put(rx_sa); 908 macsec_rxsc_put(rx_sc); 909 dev_put(dev); 910 } 911 912 static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 913 struct net_device *dev, 914 struct macsec_rx_sa *rx_sa, 915 sci_t sci, 916 struct macsec_secy *secy) 917 { 918 int ret; 919 struct scatterlist *sg; 920 unsigned char *iv; 921 struct aead_request *req; 922 struct macsec_eth_header *hdr; 923 u16 icv_len = secy->icv_len; 924 925 macsec_skb_cb(skb)->valid = false; 926 skb = skb_share_check(skb, GFP_ATOMIC); 927 if (!skb) 928 return ERR_PTR(-ENOMEM); 929 930 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg); 931 if (!req) { 932 kfree_skb(skb); 933 return ERR_PTR(-ENOMEM); 934 } 935 936 hdr = (struct macsec_eth_header *)skb->data; 937 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number)); 938 939 sg_init_table(sg, MAX_SKB_FRAGS + 1); 940 skb_to_sgvec(skb, sg, 0, skb->len); 941 942 if (hdr->tci_an & MACSEC_TCI_E) { 943 /* confidentiality: ethernet + macsec header 944 * authenticated, encrypted payload 945 */ 946 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 947 948 aead_request_set_crypt(req, sg, sg, len, iv); 949 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 950 skb = skb_unshare(skb, GFP_ATOMIC); 951 if (!skb) { 952 aead_request_free(req); 953 return ERR_PTR(-ENOMEM); 954 } 955 } else { 956 /* integrity only: all headers + data authenticated */ 957 aead_request_set_crypt(req, sg, sg, icv_len, iv); 958 aead_request_set_ad(req, skb->len - icv_len); 959 } 960 961 macsec_skb_cb(skb)->req = req; 962 skb->dev = dev; 963 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 964 965 dev_hold(dev); 966 ret = crypto_aead_decrypt(req); 967 if (ret == -EINPROGRESS) { 968 return ERR_PTR(ret); 969 } else if (ret != 0) { 970 /* decryption/authentication failed 971 * 10.6 if validateFrames is disabled, deliver anyway 972 */ 973 if (ret != -EBADMSG) { 974 kfree_skb(skb); 975 skb = ERR_PTR(ret); 976 } 977 } else { 978 macsec_skb_cb(skb)->valid = true; 979 } 980 dev_put(dev); 981 982 aead_request_free(req); 983 984 return skb; 985 } 986 987 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 988 { 989 struct macsec_rx_sc *rx_sc; 990 991 for_each_rxsc(secy, rx_sc) { 992 if (rx_sc->sci == sci) 993 return rx_sc; 994 } 995 996 return NULL; 997 } 998 999 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 1000 { 1001 struct macsec_rx_sc *rx_sc; 1002 1003 for_each_rxsc_rtnl(secy, rx_sc) { 1004 if (rx_sc->sci == sci) 1005 return rx_sc; 1006 } 1007 1008 return NULL; 1009 } 1010 1011 static void handle_not_macsec(struct sk_buff *skb) 1012 { 1013 struct macsec_rxh_data *rxd; 1014 struct macsec_dev *macsec; 1015 1016 rcu_read_lock(); 1017 rxd = macsec_data_rcu(skb->dev); 1018 1019 /* 10.6 If the management control validateFrames is not 1020 * Strict, frames without a SecTAG are received, counted, and 1021 * delivered to the Controlled Port 1022 */ 1023 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1024 struct sk_buff *nskb; 1025 int ret; 1026 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 1027 1028 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1029 u64_stats_update_begin(&secy_stats->syncp); 1030 secy_stats->stats.InPktsNoTag++; 1031 u64_stats_update_end(&secy_stats->syncp); 1032 continue; 1033 } 1034 1035 /* deliver on this port */ 1036 nskb = skb_clone(skb, GFP_ATOMIC); 1037 if (!nskb) 1038 break; 1039 1040 nskb->dev = macsec->secy.netdev; 1041 1042 ret = netif_rx(nskb); 1043 if (ret == NET_RX_SUCCESS) { 1044 u64_stats_update_begin(&secy_stats->syncp); 1045 secy_stats->stats.InPktsUntagged++; 1046 u64_stats_update_end(&secy_stats->syncp); 1047 } else { 1048 macsec->secy.netdev->stats.rx_dropped++; 1049 } 1050 } 1051 1052 rcu_read_unlock(); 1053 } 1054 1055 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 1056 { 1057 struct sk_buff *skb = *pskb; 1058 struct net_device *dev = skb->dev; 1059 struct macsec_eth_header *hdr; 1060 struct macsec_secy *secy = NULL; 1061 struct macsec_rx_sc *rx_sc; 1062 struct macsec_rx_sa *rx_sa; 1063 struct macsec_rxh_data *rxd; 1064 struct macsec_dev *macsec; 1065 sci_t sci; 1066 u32 pn; 1067 bool cbit; 1068 struct pcpu_rx_sc_stats *rxsc_stats; 1069 struct pcpu_secy_stats *secy_stats; 1070 bool pulled_sci; 1071 int ret; 1072 1073 if (skb_headroom(skb) < ETH_HLEN) 1074 goto drop_direct; 1075 1076 hdr = macsec_ethhdr(skb); 1077 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) { 1078 handle_not_macsec(skb); 1079 1080 /* and deliver to the uncontrolled port */ 1081 return RX_HANDLER_PASS; 1082 } 1083 1084 skb = skb_unshare(skb, GFP_ATOMIC); 1085 if (!skb) { 1086 *pskb = NULL; 1087 return RX_HANDLER_CONSUMED; 1088 } 1089 1090 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1091 if (!pulled_sci) { 1092 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1093 goto drop_direct; 1094 } 1095 1096 hdr = macsec_ethhdr(skb); 1097 1098 /* Frames with a SecTAG that has the TCI E bit set but the C 1099 * bit clear are discarded, as this reserved encoding is used 1100 * to identify frames with a SecTAG that are not to be 1101 * delivered to the Controlled Port. 1102 */ 1103 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1104 return RX_HANDLER_PASS; 1105 1106 /* now, pull the extra length */ 1107 if (hdr->tci_an & MACSEC_TCI_SC) { 1108 if (!pulled_sci) 1109 goto drop_direct; 1110 } 1111 1112 /* ethernet header is part of crypto processing */ 1113 skb_push(skb, ETH_HLEN); 1114 1115 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1116 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1117 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci); 1118 1119 rcu_read_lock(); 1120 rxd = macsec_data_rcu(skb->dev); 1121 1122 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1123 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1124 sc = sc ? macsec_rxsc_get(sc) : NULL; 1125 1126 if (sc) { 1127 secy = &macsec->secy; 1128 rx_sc = sc; 1129 break; 1130 } 1131 } 1132 1133 if (!secy) 1134 goto nosci; 1135 1136 dev = secy->netdev; 1137 macsec = macsec_priv(dev); 1138 secy_stats = this_cpu_ptr(macsec->stats); 1139 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1140 1141 if (!macsec_validate_skb(skb, secy->icv_len)) { 1142 u64_stats_update_begin(&secy_stats->syncp); 1143 secy_stats->stats.InPktsBadTag++; 1144 u64_stats_update_end(&secy_stats->syncp); 1145 goto drop_nosa; 1146 } 1147 1148 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1149 if (!rx_sa) { 1150 /* 10.6.1 if the SA is not in use */ 1151 1152 /* If validateFrames is Strict or the C bit in the 1153 * SecTAG is set, discard 1154 */ 1155 if (hdr->tci_an & MACSEC_TCI_C || 1156 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1157 u64_stats_update_begin(&rxsc_stats->syncp); 1158 rxsc_stats->stats.InPktsNotUsingSA++; 1159 u64_stats_update_end(&rxsc_stats->syncp); 1160 goto drop_nosa; 1161 } 1162 1163 /* not Strict, the frame (with the SecTAG and ICV 1164 * removed) is delivered to the Controlled Port. 1165 */ 1166 u64_stats_update_begin(&rxsc_stats->syncp); 1167 rxsc_stats->stats.InPktsUnusedSA++; 1168 u64_stats_update_end(&rxsc_stats->syncp); 1169 goto deliver; 1170 } 1171 1172 /* First, PN check to avoid decrypting obviously wrong packets */ 1173 pn = ntohl(hdr->packet_number); 1174 if (secy->replay_protect) { 1175 bool late; 1176 1177 spin_lock(&rx_sa->lock); 1178 late = rx_sa->next_pn >= secy->replay_window && 1179 pn < (rx_sa->next_pn - secy->replay_window); 1180 spin_unlock(&rx_sa->lock); 1181 1182 if (late) { 1183 u64_stats_update_begin(&rxsc_stats->syncp); 1184 rxsc_stats->stats.InPktsLate++; 1185 u64_stats_update_end(&rxsc_stats->syncp); 1186 goto drop; 1187 } 1188 } 1189 1190 macsec_skb_cb(skb)->rx_sa = rx_sa; 1191 1192 /* Disabled && !changed text => skip validation */ 1193 if (hdr->tci_an & MACSEC_TCI_C || 1194 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1195 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1196 1197 if (IS_ERR(skb)) { 1198 /* the decrypt callback needs the reference */ 1199 if (PTR_ERR(skb) != -EINPROGRESS) { 1200 macsec_rxsa_put(rx_sa); 1201 macsec_rxsc_put(rx_sc); 1202 } 1203 rcu_read_unlock(); 1204 *pskb = NULL; 1205 return RX_HANDLER_CONSUMED; 1206 } 1207 1208 if (!macsec_post_decrypt(skb, secy, pn)) 1209 goto drop; 1210 1211 deliver: 1212 macsec_finalize_skb(skb, secy->icv_len, 1213 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1214 macsec_reset_skb(skb, secy->netdev); 1215 1216 if (rx_sa) 1217 macsec_rxsa_put(rx_sa); 1218 macsec_rxsc_put(rx_sc); 1219 1220 ret = gro_cells_receive(&macsec->gro_cells, skb); 1221 if (ret == NET_RX_SUCCESS) 1222 count_rx(dev, skb->len); 1223 else 1224 macsec->secy.netdev->stats.rx_dropped++; 1225 1226 rcu_read_unlock(); 1227 1228 *pskb = NULL; 1229 return RX_HANDLER_CONSUMED; 1230 1231 drop: 1232 macsec_rxsa_put(rx_sa); 1233 drop_nosa: 1234 macsec_rxsc_put(rx_sc); 1235 rcu_read_unlock(); 1236 drop_direct: 1237 kfree_skb(skb); 1238 *pskb = NULL; 1239 return RX_HANDLER_CONSUMED; 1240 1241 nosci: 1242 /* 10.6.1 if the SC is not found */ 1243 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1244 if (!cbit) 1245 macsec_finalize_skb(skb, DEFAULT_ICV_LEN, 1246 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1247 1248 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1249 struct sk_buff *nskb; 1250 1251 secy_stats = this_cpu_ptr(macsec->stats); 1252 1253 /* If validateFrames is Strict or the C bit in the 1254 * SecTAG is set, discard 1255 */ 1256 if (cbit || 1257 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1258 u64_stats_update_begin(&secy_stats->syncp); 1259 secy_stats->stats.InPktsNoSCI++; 1260 u64_stats_update_end(&secy_stats->syncp); 1261 continue; 1262 } 1263 1264 /* not strict, the frame (with the SecTAG and ICV 1265 * removed) is delivered to the Controlled Port. 1266 */ 1267 nskb = skb_clone(skb, GFP_ATOMIC); 1268 if (!nskb) 1269 break; 1270 1271 macsec_reset_skb(nskb, macsec->secy.netdev); 1272 1273 ret = netif_rx(nskb); 1274 if (ret == NET_RX_SUCCESS) { 1275 u64_stats_update_begin(&secy_stats->syncp); 1276 secy_stats->stats.InPktsUnknownSCI++; 1277 u64_stats_update_end(&secy_stats->syncp); 1278 } else { 1279 macsec->secy.netdev->stats.rx_dropped++; 1280 } 1281 } 1282 1283 rcu_read_unlock(); 1284 *pskb = skb; 1285 return RX_HANDLER_PASS; 1286 } 1287 1288 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1289 { 1290 struct crypto_aead *tfm; 1291 int ret; 1292 1293 tfm = crypto_alloc_aead("gcm(aes)", 0, 0); 1294 1295 if (IS_ERR(tfm)) 1296 return tfm; 1297 1298 ret = crypto_aead_setkey(tfm, key, key_len); 1299 if (ret < 0) 1300 goto fail; 1301 1302 ret = crypto_aead_setauthsize(tfm, icv_len); 1303 if (ret < 0) 1304 goto fail; 1305 1306 return tfm; 1307 fail: 1308 crypto_free_aead(tfm); 1309 return ERR_PTR(ret); 1310 } 1311 1312 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1313 int icv_len) 1314 { 1315 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1316 if (!rx_sa->stats) 1317 return -ENOMEM; 1318 1319 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1320 if (IS_ERR(rx_sa->key.tfm)) { 1321 free_percpu(rx_sa->stats); 1322 return PTR_ERR(rx_sa->key.tfm); 1323 } 1324 1325 rx_sa->active = false; 1326 rx_sa->next_pn = 1; 1327 atomic_set(&rx_sa->refcnt, 1); 1328 spin_lock_init(&rx_sa->lock); 1329 1330 return 0; 1331 } 1332 1333 static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1334 { 1335 rx_sa->active = false; 1336 1337 macsec_rxsa_put(rx_sa); 1338 } 1339 1340 static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1341 { 1342 int i; 1343 1344 for (i = 0; i < MACSEC_NUM_AN; i++) { 1345 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1346 1347 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1348 if (sa) 1349 clear_rx_sa(sa); 1350 } 1351 1352 macsec_rxsc_put(rx_sc); 1353 } 1354 1355 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1356 { 1357 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1358 1359 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1360 rx_sc; 1361 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1362 if (rx_sc->sci == sci) { 1363 if (rx_sc->active) 1364 secy->n_rx_sc--; 1365 rcu_assign_pointer(*rx_scp, rx_sc->next); 1366 return rx_sc; 1367 } 1368 } 1369 1370 return NULL; 1371 } 1372 1373 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci) 1374 { 1375 struct macsec_rx_sc *rx_sc; 1376 struct macsec_dev *macsec; 1377 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1378 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1379 struct macsec_secy *secy; 1380 1381 list_for_each_entry(macsec, &rxd->secys, secys) { 1382 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1383 return ERR_PTR(-EEXIST); 1384 } 1385 1386 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL); 1387 if (!rx_sc) 1388 return ERR_PTR(-ENOMEM); 1389 1390 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1391 if (!rx_sc->stats) { 1392 kfree(rx_sc); 1393 return ERR_PTR(-ENOMEM); 1394 } 1395 1396 rx_sc->sci = sci; 1397 rx_sc->active = true; 1398 atomic_set(&rx_sc->refcnt, 1); 1399 1400 secy = &macsec_priv(dev)->secy; 1401 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1402 rcu_assign_pointer(secy->rx_sc, rx_sc); 1403 1404 if (rx_sc->active) 1405 secy->n_rx_sc++; 1406 1407 return rx_sc; 1408 } 1409 1410 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1411 int icv_len) 1412 { 1413 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1414 if (!tx_sa->stats) 1415 return -ENOMEM; 1416 1417 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1418 if (IS_ERR(tx_sa->key.tfm)) { 1419 free_percpu(tx_sa->stats); 1420 return PTR_ERR(tx_sa->key.tfm); 1421 } 1422 1423 tx_sa->active = false; 1424 atomic_set(&tx_sa->refcnt, 1); 1425 spin_lock_init(&tx_sa->lock); 1426 1427 return 0; 1428 } 1429 1430 static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1431 { 1432 tx_sa->active = false; 1433 1434 macsec_txsa_put(tx_sa); 1435 } 1436 1437 static struct genl_family macsec_fam; 1438 1439 static struct net_device *get_dev_from_nl(struct net *net, 1440 struct nlattr **attrs) 1441 { 1442 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1443 struct net_device *dev; 1444 1445 dev = __dev_get_by_index(net, ifindex); 1446 if (!dev) 1447 return ERR_PTR(-ENODEV); 1448 1449 if (!netif_is_macsec(dev)) 1450 return ERR_PTR(-ENODEV); 1451 1452 return dev; 1453 } 1454 1455 static sci_t nla_get_sci(const struct nlattr *nla) 1456 { 1457 return (__force sci_t)nla_get_u64(nla); 1458 } 1459 1460 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, 1461 int padattr) 1462 { 1463 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); 1464 } 1465 1466 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1467 struct nlattr **attrs, 1468 struct nlattr **tb_sa, 1469 struct net_device **devp, 1470 struct macsec_secy **secyp, 1471 struct macsec_tx_sc **scp, 1472 u8 *assoc_num) 1473 { 1474 struct net_device *dev; 1475 struct macsec_secy *secy; 1476 struct macsec_tx_sc *tx_sc; 1477 struct macsec_tx_sa *tx_sa; 1478 1479 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1480 return ERR_PTR(-EINVAL); 1481 1482 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1483 1484 dev = get_dev_from_nl(net, attrs); 1485 if (IS_ERR(dev)) 1486 return ERR_CAST(dev); 1487 1488 if (*assoc_num >= MACSEC_NUM_AN) 1489 return ERR_PTR(-EINVAL); 1490 1491 secy = &macsec_priv(dev)->secy; 1492 tx_sc = &secy->tx_sc; 1493 1494 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1495 if (!tx_sa) 1496 return ERR_PTR(-ENODEV); 1497 1498 *devp = dev; 1499 *scp = tx_sc; 1500 *secyp = secy; 1501 return tx_sa; 1502 } 1503 1504 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1505 struct nlattr **attrs, 1506 struct nlattr **tb_rxsc, 1507 struct net_device **devp, 1508 struct macsec_secy **secyp) 1509 { 1510 struct net_device *dev; 1511 struct macsec_secy *secy; 1512 struct macsec_rx_sc *rx_sc; 1513 sci_t sci; 1514 1515 dev = get_dev_from_nl(net, attrs); 1516 if (IS_ERR(dev)) 1517 return ERR_CAST(dev); 1518 1519 secy = &macsec_priv(dev)->secy; 1520 1521 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1522 return ERR_PTR(-EINVAL); 1523 1524 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1525 rx_sc = find_rx_sc_rtnl(secy, sci); 1526 if (!rx_sc) 1527 return ERR_PTR(-ENODEV); 1528 1529 *secyp = secy; 1530 *devp = dev; 1531 1532 return rx_sc; 1533 } 1534 1535 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1536 struct nlattr **attrs, 1537 struct nlattr **tb_rxsc, 1538 struct nlattr **tb_sa, 1539 struct net_device **devp, 1540 struct macsec_secy **secyp, 1541 struct macsec_rx_sc **scp, 1542 u8 *assoc_num) 1543 { 1544 struct macsec_rx_sc *rx_sc; 1545 struct macsec_rx_sa *rx_sa; 1546 1547 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1548 return ERR_PTR(-EINVAL); 1549 1550 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1551 if (*assoc_num >= MACSEC_NUM_AN) 1552 return ERR_PTR(-EINVAL); 1553 1554 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1555 if (IS_ERR(rx_sc)) 1556 return ERR_CAST(rx_sc); 1557 1558 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1559 if (!rx_sa) 1560 return ERR_PTR(-ENODEV); 1561 1562 *scp = rx_sc; 1563 return rx_sa; 1564 } 1565 1566 1567 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1568 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1569 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1570 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1571 }; 1572 1573 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1574 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1575 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, 1576 }; 1577 1578 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1579 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, 1580 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, 1581 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 }, 1582 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY, 1583 .len = MACSEC_KEYID_LEN, }, 1584 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1585 .len = MACSEC_MAX_KEY_LEN, }, 1586 }; 1587 1588 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1589 { 1590 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1591 return -EINVAL; 1592 1593 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, 1594 attrs[MACSEC_ATTR_SA_CONFIG], 1595 macsec_genl_sa_policy, NULL)) 1596 return -EINVAL; 1597 1598 return 0; 1599 } 1600 1601 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1602 { 1603 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1604 return -EINVAL; 1605 1606 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, 1607 attrs[MACSEC_ATTR_RXSC_CONFIG], 1608 macsec_genl_rxsc_policy, NULL)) 1609 return -EINVAL; 1610 1611 return 0; 1612 } 1613 1614 static bool validate_add_rxsa(struct nlattr **attrs) 1615 { 1616 if (!attrs[MACSEC_SA_ATTR_AN] || 1617 !attrs[MACSEC_SA_ATTR_KEY] || 1618 !attrs[MACSEC_SA_ATTR_KEYID]) 1619 return false; 1620 1621 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1622 return false; 1623 1624 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1625 return false; 1626 1627 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1628 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1629 return false; 1630 } 1631 1632 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1633 return false; 1634 1635 return true; 1636 } 1637 1638 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1639 { 1640 struct net_device *dev; 1641 struct nlattr **attrs = info->attrs; 1642 struct macsec_secy *secy; 1643 struct macsec_rx_sc *rx_sc; 1644 struct macsec_rx_sa *rx_sa; 1645 unsigned char assoc_num; 1646 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1647 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1648 int err; 1649 1650 if (!attrs[MACSEC_ATTR_IFINDEX]) 1651 return -EINVAL; 1652 1653 if (parse_sa_config(attrs, tb_sa)) 1654 return -EINVAL; 1655 1656 if (parse_rxsc_config(attrs, tb_rxsc)) 1657 return -EINVAL; 1658 1659 if (!validate_add_rxsa(tb_sa)) 1660 return -EINVAL; 1661 1662 rtnl_lock(); 1663 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1664 if (IS_ERR(rx_sc)) { 1665 rtnl_unlock(); 1666 return PTR_ERR(rx_sc); 1667 } 1668 1669 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1670 1671 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1672 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1673 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1674 rtnl_unlock(); 1675 return -EINVAL; 1676 } 1677 1678 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1679 if (rx_sa) { 1680 rtnl_unlock(); 1681 return -EBUSY; 1682 } 1683 1684 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1685 if (!rx_sa) { 1686 rtnl_unlock(); 1687 return -ENOMEM; 1688 } 1689 1690 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1691 secy->key_len, secy->icv_len); 1692 if (err < 0) { 1693 kfree(rx_sa); 1694 rtnl_unlock(); 1695 return err; 1696 } 1697 1698 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1699 spin_lock_bh(&rx_sa->lock); 1700 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1701 spin_unlock_bh(&rx_sa->lock); 1702 } 1703 1704 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1705 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1706 1707 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1708 rx_sa->sc = rx_sc; 1709 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1710 1711 rtnl_unlock(); 1712 1713 return 0; 1714 } 1715 1716 static bool validate_add_rxsc(struct nlattr **attrs) 1717 { 1718 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1719 return false; 1720 1721 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1722 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1723 return false; 1724 } 1725 1726 return true; 1727 } 1728 1729 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1730 { 1731 struct net_device *dev; 1732 sci_t sci = MACSEC_UNDEF_SCI; 1733 struct nlattr **attrs = info->attrs; 1734 struct macsec_rx_sc *rx_sc; 1735 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1736 1737 if (!attrs[MACSEC_ATTR_IFINDEX]) 1738 return -EINVAL; 1739 1740 if (parse_rxsc_config(attrs, tb_rxsc)) 1741 return -EINVAL; 1742 1743 if (!validate_add_rxsc(tb_rxsc)) 1744 return -EINVAL; 1745 1746 rtnl_lock(); 1747 dev = get_dev_from_nl(genl_info_net(info), attrs); 1748 if (IS_ERR(dev)) { 1749 rtnl_unlock(); 1750 return PTR_ERR(dev); 1751 } 1752 1753 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1754 1755 rx_sc = create_rx_sc(dev, sci); 1756 if (IS_ERR(rx_sc)) { 1757 rtnl_unlock(); 1758 return PTR_ERR(rx_sc); 1759 } 1760 1761 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1762 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1763 1764 rtnl_unlock(); 1765 1766 return 0; 1767 } 1768 1769 static bool validate_add_txsa(struct nlattr **attrs) 1770 { 1771 if (!attrs[MACSEC_SA_ATTR_AN] || 1772 !attrs[MACSEC_SA_ATTR_PN] || 1773 !attrs[MACSEC_SA_ATTR_KEY] || 1774 !attrs[MACSEC_SA_ATTR_KEYID]) 1775 return false; 1776 1777 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1778 return false; 1779 1780 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1781 return false; 1782 1783 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1784 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1785 return false; 1786 } 1787 1788 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1789 return false; 1790 1791 return true; 1792 } 1793 1794 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1795 { 1796 struct net_device *dev; 1797 struct nlattr **attrs = info->attrs; 1798 struct macsec_secy *secy; 1799 struct macsec_tx_sc *tx_sc; 1800 struct macsec_tx_sa *tx_sa; 1801 unsigned char assoc_num; 1802 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1803 int err; 1804 1805 if (!attrs[MACSEC_ATTR_IFINDEX]) 1806 return -EINVAL; 1807 1808 if (parse_sa_config(attrs, tb_sa)) 1809 return -EINVAL; 1810 1811 if (!validate_add_txsa(tb_sa)) 1812 return -EINVAL; 1813 1814 rtnl_lock(); 1815 dev = get_dev_from_nl(genl_info_net(info), attrs); 1816 if (IS_ERR(dev)) { 1817 rtnl_unlock(); 1818 return PTR_ERR(dev); 1819 } 1820 1821 secy = &macsec_priv(dev)->secy; 1822 tx_sc = &secy->tx_sc; 1823 1824 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1825 1826 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1827 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 1828 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1829 rtnl_unlock(); 1830 return -EINVAL; 1831 } 1832 1833 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 1834 if (tx_sa) { 1835 rtnl_unlock(); 1836 return -EBUSY; 1837 } 1838 1839 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 1840 if (!tx_sa) { 1841 rtnl_unlock(); 1842 return -ENOMEM; 1843 } 1844 1845 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1846 secy->key_len, secy->icv_len); 1847 if (err < 0) { 1848 kfree(tx_sa); 1849 rtnl_unlock(); 1850 return err; 1851 } 1852 1853 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1854 1855 spin_lock_bh(&tx_sa->lock); 1856 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1857 spin_unlock_bh(&tx_sa->lock); 1858 1859 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1860 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1861 1862 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 1863 secy->operational = true; 1864 1865 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 1866 1867 rtnl_unlock(); 1868 1869 return 0; 1870 } 1871 1872 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 1873 { 1874 struct nlattr **attrs = info->attrs; 1875 struct net_device *dev; 1876 struct macsec_secy *secy; 1877 struct macsec_rx_sc *rx_sc; 1878 struct macsec_rx_sa *rx_sa; 1879 u8 assoc_num; 1880 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1881 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1882 1883 if (!attrs[MACSEC_ATTR_IFINDEX]) 1884 return -EINVAL; 1885 1886 if (parse_sa_config(attrs, tb_sa)) 1887 return -EINVAL; 1888 1889 if (parse_rxsc_config(attrs, tb_rxsc)) 1890 return -EINVAL; 1891 1892 rtnl_lock(); 1893 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 1894 &dev, &secy, &rx_sc, &assoc_num); 1895 if (IS_ERR(rx_sa)) { 1896 rtnl_unlock(); 1897 return PTR_ERR(rx_sa); 1898 } 1899 1900 if (rx_sa->active) { 1901 rtnl_unlock(); 1902 return -EBUSY; 1903 } 1904 1905 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 1906 clear_rx_sa(rx_sa); 1907 1908 rtnl_unlock(); 1909 1910 return 0; 1911 } 1912 1913 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 1914 { 1915 struct nlattr **attrs = info->attrs; 1916 struct net_device *dev; 1917 struct macsec_secy *secy; 1918 struct macsec_rx_sc *rx_sc; 1919 sci_t sci; 1920 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1921 1922 if (!attrs[MACSEC_ATTR_IFINDEX]) 1923 return -EINVAL; 1924 1925 if (parse_rxsc_config(attrs, tb_rxsc)) 1926 return -EINVAL; 1927 1928 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1929 return -EINVAL; 1930 1931 rtnl_lock(); 1932 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 1933 if (IS_ERR(dev)) { 1934 rtnl_unlock(); 1935 return PTR_ERR(dev); 1936 } 1937 1938 secy = &macsec_priv(dev)->secy; 1939 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1940 1941 rx_sc = del_rx_sc(secy, sci); 1942 if (!rx_sc) { 1943 rtnl_unlock(); 1944 return -ENODEV; 1945 } 1946 1947 free_rx_sc(rx_sc); 1948 rtnl_unlock(); 1949 1950 return 0; 1951 } 1952 1953 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 1954 { 1955 struct nlattr **attrs = info->attrs; 1956 struct net_device *dev; 1957 struct macsec_secy *secy; 1958 struct macsec_tx_sc *tx_sc; 1959 struct macsec_tx_sa *tx_sa; 1960 u8 assoc_num; 1961 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1962 1963 if (!attrs[MACSEC_ATTR_IFINDEX]) 1964 return -EINVAL; 1965 1966 if (parse_sa_config(attrs, tb_sa)) 1967 return -EINVAL; 1968 1969 rtnl_lock(); 1970 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 1971 &dev, &secy, &tx_sc, &assoc_num); 1972 if (IS_ERR(tx_sa)) { 1973 rtnl_unlock(); 1974 return PTR_ERR(tx_sa); 1975 } 1976 1977 if (tx_sa->active) { 1978 rtnl_unlock(); 1979 return -EBUSY; 1980 } 1981 1982 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 1983 clear_tx_sa(tx_sa); 1984 1985 rtnl_unlock(); 1986 1987 return 0; 1988 } 1989 1990 static bool validate_upd_sa(struct nlattr **attrs) 1991 { 1992 if (!attrs[MACSEC_SA_ATTR_AN] || 1993 attrs[MACSEC_SA_ATTR_KEY] || 1994 attrs[MACSEC_SA_ATTR_KEYID]) 1995 return false; 1996 1997 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1998 return false; 1999 2000 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 2001 return false; 2002 2003 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 2004 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 2005 return false; 2006 } 2007 2008 return true; 2009 } 2010 2011 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2012 { 2013 struct nlattr **attrs = info->attrs; 2014 struct net_device *dev; 2015 struct macsec_secy *secy; 2016 struct macsec_tx_sc *tx_sc; 2017 struct macsec_tx_sa *tx_sa; 2018 u8 assoc_num; 2019 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2020 2021 if (!attrs[MACSEC_ATTR_IFINDEX]) 2022 return -EINVAL; 2023 2024 if (parse_sa_config(attrs, tb_sa)) 2025 return -EINVAL; 2026 2027 if (!validate_upd_sa(tb_sa)) 2028 return -EINVAL; 2029 2030 rtnl_lock(); 2031 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2032 &dev, &secy, &tx_sc, &assoc_num); 2033 if (IS_ERR(tx_sa)) { 2034 rtnl_unlock(); 2035 return PTR_ERR(tx_sa); 2036 } 2037 2038 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2039 spin_lock_bh(&tx_sa->lock); 2040 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 2041 spin_unlock_bh(&tx_sa->lock); 2042 } 2043 2044 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2045 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2046 2047 if (assoc_num == tx_sc->encoding_sa) 2048 secy->operational = tx_sa->active; 2049 2050 rtnl_unlock(); 2051 2052 return 0; 2053 } 2054 2055 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2056 { 2057 struct nlattr **attrs = info->attrs; 2058 struct net_device *dev; 2059 struct macsec_secy *secy; 2060 struct macsec_rx_sc *rx_sc; 2061 struct macsec_rx_sa *rx_sa; 2062 u8 assoc_num; 2063 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2064 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2065 2066 if (!attrs[MACSEC_ATTR_IFINDEX]) 2067 return -EINVAL; 2068 2069 if (parse_rxsc_config(attrs, tb_rxsc)) 2070 return -EINVAL; 2071 2072 if (parse_sa_config(attrs, tb_sa)) 2073 return -EINVAL; 2074 2075 if (!validate_upd_sa(tb_sa)) 2076 return -EINVAL; 2077 2078 rtnl_lock(); 2079 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2080 &dev, &secy, &rx_sc, &assoc_num); 2081 if (IS_ERR(rx_sa)) { 2082 rtnl_unlock(); 2083 return PTR_ERR(rx_sa); 2084 } 2085 2086 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2087 spin_lock_bh(&rx_sa->lock); 2088 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 2089 spin_unlock_bh(&rx_sa->lock); 2090 } 2091 2092 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2093 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2094 2095 rtnl_unlock(); 2096 return 0; 2097 } 2098 2099 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2100 { 2101 struct nlattr **attrs = info->attrs; 2102 struct net_device *dev; 2103 struct macsec_secy *secy; 2104 struct macsec_rx_sc *rx_sc; 2105 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2106 2107 if (!attrs[MACSEC_ATTR_IFINDEX]) 2108 return -EINVAL; 2109 2110 if (parse_rxsc_config(attrs, tb_rxsc)) 2111 return -EINVAL; 2112 2113 if (!validate_add_rxsc(tb_rxsc)) 2114 return -EINVAL; 2115 2116 rtnl_lock(); 2117 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2118 if (IS_ERR(rx_sc)) { 2119 rtnl_unlock(); 2120 return PTR_ERR(rx_sc); 2121 } 2122 2123 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2124 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2125 2126 if (rx_sc->active != new) 2127 secy->n_rx_sc += new ? 1 : -1; 2128 2129 rx_sc->active = new; 2130 } 2131 2132 rtnl_unlock(); 2133 2134 return 0; 2135 } 2136 2137 static int copy_tx_sa_stats(struct sk_buff *skb, 2138 struct macsec_tx_sa_stats __percpu *pstats) 2139 { 2140 struct macsec_tx_sa_stats sum = {0, }; 2141 int cpu; 2142 2143 for_each_possible_cpu(cpu) { 2144 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2145 2146 sum.OutPktsProtected += stats->OutPktsProtected; 2147 sum.OutPktsEncrypted += stats->OutPktsEncrypted; 2148 } 2149 2150 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) || 2151 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted)) 2152 return -EMSGSIZE; 2153 2154 return 0; 2155 } 2156 2157 static int copy_rx_sa_stats(struct sk_buff *skb, 2158 struct macsec_rx_sa_stats __percpu *pstats) 2159 { 2160 struct macsec_rx_sa_stats sum = {0, }; 2161 int cpu; 2162 2163 for_each_possible_cpu(cpu) { 2164 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2165 2166 sum.InPktsOK += stats->InPktsOK; 2167 sum.InPktsInvalid += stats->InPktsInvalid; 2168 sum.InPktsNotValid += stats->InPktsNotValid; 2169 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA; 2170 sum.InPktsUnusedSA += stats->InPktsUnusedSA; 2171 } 2172 2173 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) || 2174 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) || 2175 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) || 2176 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) || 2177 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA)) 2178 return -EMSGSIZE; 2179 2180 return 0; 2181 } 2182 2183 static int copy_rx_sc_stats(struct sk_buff *skb, 2184 struct pcpu_rx_sc_stats __percpu *pstats) 2185 { 2186 struct macsec_rx_sc_stats sum = {0, }; 2187 int cpu; 2188 2189 for_each_possible_cpu(cpu) { 2190 const struct pcpu_rx_sc_stats *stats; 2191 struct macsec_rx_sc_stats tmp; 2192 unsigned int start; 2193 2194 stats = per_cpu_ptr(pstats, cpu); 2195 do { 2196 start = u64_stats_fetch_begin_irq(&stats->syncp); 2197 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2198 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2199 2200 sum.InOctetsValidated += tmp.InOctetsValidated; 2201 sum.InOctetsDecrypted += tmp.InOctetsDecrypted; 2202 sum.InPktsUnchecked += tmp.InPktsUnchecked; 2203 sum.InPktsDelayed += tmp.InPktsDelayed; 2204 sum.InPktsOK += tmp.InPktsOK; 2205 sum.InPktsInvalid += tmp.InPktsInvalid; 2206 sum.InPktsLate += tmp.InPktsLate; 2207 sum.InPktsNotValid += tmp.InPktsNotValid; 2208 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2209 sum.InPktsUnusedSA += tmp.InPktsUnusedSA; 2210 } 2211 2212 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2213 sum.InOctetsValidated, 2214 MACSEC_RXSC_STATS_ATTR_PAD) || 2215 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2216 sum.InOctetsDecrypted, 2217 MACSEC_RXSC_STATS_ATTR_PAD) || 2218 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2219 sum.InPktsUnchecked, 2220 MACSEC_RXSC_STATS_ATTR_PAD) || 2221 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2222 sum.InPktsDelayed, 2223 MACSEC_RXSC_STATS_ATTR_PAD) || 2224 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2225 sum.InPktsOK, 2226 MACSEC_RXSC_STATS_ATTR_PAD) || 2227 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2228 sum.InPktsInvalid, 2229 MACSEC_RXSC_STATS_ATTR_PAD) || 2230 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2231 sum.InPktsLate, 2232 MACSEC_RXSC_STATS_ATTR_PAD) || 2233 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2234 sum.InPktsNotValid, 2235 MACSEC_RXSC_STATS_ATTR_PAD) || 2236 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2237 sum.InPktsNotUsingSA, 2238 MACSEC_RXSC_STATS_ATTR_PAD) || 2239 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2240 sum.InPktsUnusedSA, 2241 MACSEC_RXSC_STATS_ATTR_PAD)) 2242 return -EMSGSIZE; 2243 2244 return 0; 2245 } 2246 2247 static int copy_tx_sc_stats(struct sk_buff *skb, 2248 struct pcpu_tx_sc_stats __percpu *pstats) 2249 { 2250 struct macsec_tx_sc_stats sum = {0, }; 2251 int cpu; 2252 2253 for_each_possible_cpu(cpu) { 2254 const struct pcpu_tx_sc_stats *stats; 2255 struct macsec_tx_sc_stats tmp; 2256 unsigned int start; 2257 2258 stats = per_cpu_ptr(pstats, cpu); 2259 do { 2260 start = u64_stats_fetch_begin_irq(&stats->syncp); 2261 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2262 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2263 2264 sum.OutPktsProtected += tmp.OutPktsProtected; 2265 sum.OutPktsEncrypted += tmp.OutPktsEncrypted; 2266 sum.OutOctetsProtected += tmp.OutOctetsProtected; 2267 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2268 } 2269 2270 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2271 sum.OutPktsProtected, 2272 MACSEC_TXSC_STATS_ATTR_PAD) || 2273 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2274 sum.OutPktsEncrypted, 2275 MACSEC_TXSC_STATS_ATTR_PAD) || 2276 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2277 sum.OutOctetsProtected, 2278 MACSEC_TXSC_STATS_ATTR_PAD) || 2279 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2280 sum.OutOctetsEncrypted, 2281 MACSEC_TXSC_STATS_ATTR_PAD)) 2282 return -EMSGSIZE; 2283 2284 return 0; 2285 } 2286 2287 static int copy_secy_stats(struct sk_buff *skb, 2288 struct pcpu_secy_stats __percpu *pstats) 2289 { 2290 struct macsec_dev_stats sum = {0, }; 2291 int cpu; 2292 2293 for_each_possible_cpu(cpu) { 2294 const struct pcpu_secy_stats *stats; 2295 struct macsec_dev_stats tmp; 2296 unsigned int start; 2297 2298 stats = per_cpu_ptr(pstats, cpu); 2299 do { 2300 start = u64_stats_fetch_begin_irq(&stats->syncp); 2301 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2302 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2303 2304 sum.OutPktsUntagged += tmp.OutPktsUntagged; 2305 sum.InPktsUntagged += tmp.InPktsUntagged; 2306 sum.OutPktsTooLong += tmp.OutPktsTooLong; 2307 sum.InPktsNoTag += tmp.InPktsNoTag; 2308 sum.InPktsBadTag += tmp.InPktsBadTag; 2309 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2310 sum.InPktsNoSCI += tmp.InPktsNoSCI; 2311 sum.InPktsOverrun += tmp.InPktsOverrun; 2312 } 2313 2314 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 2315 sum.OutPktsUntagged, 2316 MACSEC_SECY_STATS_ATTR_PAD) || 2317 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 2318 sum.InPktsUntagged, 2319 MACSEC_SECY_STATS_ATTR_PAD) || 2320 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 2321 sum.OutPktsTooLong, 2322 MACSEC_SECY_STATS_ATTR_PAD) || 2323 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 2324 sum.InPktsNoTag, 2325 MACSEC_SECY_STATS_ATTR_PAD) || 2326 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 2327 sum.InPktsBadTag, 2328 MACSEC_SECY_STATS_ATTR_PAD) || 2329 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 2330 sum.InPktsUnknownSCI, 2331 MACSEC_SECY_STATS_ATTR_PAD) || 2332 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 2333 sum.InPktsNoSCI, 2334 MACSEC_SECY_STATS_ATTR_PAD) || 2335 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 2336 sum.InPktsOverrun, 2337 MACSEC_SECY_STATS_ATTR_PAD)) 2338 return -EMSGSIZE; 2339 2340 return 0; 2341 } 2342 2343 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 2344 { 2345 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2346 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY); 2347 2348 if (!secy_nest) 2349 return 1; 2350 2351 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 2352 MACSEC_SECY_ATTR_PAD) || 2353 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 2354 MACSEC_DEFAULT_CIPHER_ID, 2355 MACSEC_SECY_ATTR_PAD) || 2356 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 2357 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 2358 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 2359 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 2360 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 2361 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 2362 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 2363 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 2364 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 2365 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 2366 goto cancel; 2367 2368 if (secy->replay_protect) { 2369 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 2370 goto cancel; 2371 } 2372 2373 nla_nest_end(skb, secy_nest); 2374 return 0; 2375 2376 cancel: 2377 nla_nest_cancel(skb, secy_nest); 2378 return 1; 2379 } 2380 2381 static int dump_secy(struct macsec_secy *secy, struct net_device *dev, 2382 struct sk_buff *skb, struct netlink_callback *cb) 2383 { 2384 struct macsec_rx_sc *rx_sc; 2385 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2386 struct nlattr *txsa_list, *rxsc_list; 2387 int i, j; 2388 void *hdr; 2389 struct nlattr *attr; 2390 2391 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 2392 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 2393 if (!hdr) 2394 return -EMSGSIZE; 2395 2396 genl_dump_check_consistent(cb, hdr, &macsec_fam); 2397 2398 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 2399 goto nla_put_failure; 2400 2401 if (nla_put_secy(secy, skb)) 2402 goto nla_put_failure; 2403 2404 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS); 2405 if (!attr) 2406 goto nla_put_failure; 2407 if (copy_tx_sc_stats(skb, tx_sc->stats)) { 2408 nla_nest_cancel(skb, attr); 2409 goto nla_put_failure; 2410 } 2411 nla_nest_end(skb, attr); 2412 2413 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS); 2414 if (!attr) 2415 goto nla_put_failure; 2416 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) { 2417 nla_nest_cancel(skb, attr); 2418 goto nla_put_failure; 2419 } 2420 nla_nest_end(skb, attr); 2421 2422 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST); 2423 if (!txsa_list) 2424 goto nla_put_failure; 2425 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 2426 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 2427 struct nlattr *txsa_nest; 2428 2429 if (!tx_sa) 2430 continue; 2431 2432 txsa_nest = nla_nest_start(skb, j++); 2433 if (!txsa_nest) { 2434 nla_nest_cancel(skb, txsa_list); 2435 goto nla_put_failure; 2436 } 2437 2438 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2439 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) || 2440 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 2441 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 2442 nla_nest_cancel(skb, txsa_nest); 2443 nla_nest_cancel(skb, txsa_list); 2444 goto nla_put_failure; 2445 } 2446 2447 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS); 2448 if (!attr) { 2449 nla_nest_cancel(skb, txsa_nest); 2450 nla_nest_cancel(skb, txsa_list); 2451 goto nla_put_failure; 2452 } 2453 if (copy_tx_sa_stats(skb, tx_sa->stats)) { 2454 nla_nest_cancel(skb, attr); 2455 nla_nest_cancel(skb, txsa_nest); 2456 nla_nest_cancel(skb, txsa_list); 2457 goto nla_put_failure; 2458 } 2459 nla_nest_end(skb, attr); 2460 2461 nla_nest_end(skb, txsa_nest); 2462 } 2463 nla_nest_end(skb, txsa_list); 2464 2465 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST); 2466 if (!rxsc_list) 2467 goto nla_put_failure; 2468 2469 j = 1; 2470 for_each_rxsc_rtnl(secy, rx_sc) { 2471 int k; 2472 struct nlattr *rxsa_list; 2473 struct nlattr *rxsc_nest = nla_nest_start(skb, j++); 2474 2475 if (!rxsc_nest) { 2476 nla_nest_cancel(skb, rxsc_list); 2477 goto nla_put_failure; 2478 } 2479 2480 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 2481 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 2482 MACSEC_RXSC_ATTR_PAD)) { 2483 nla_nest_cancel(skb, rxsc_nest); 2484 nla_nest_cancel(skb, rxsc_list); 2485 goto nla_put_failure; 2486 } 2487 2488 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS); 2489 if (!attr) { 2490 nla_nest_cancel(skb, rxsc_nest); 2491 nla_nest_cancel(skb, rxsc_list); 2492 goto nla_put_failure; 2493 } 2494 if (copy_rx_sc_stats(skb, rx_sc->stats)) { 2495 nla_nest_cancel(skb, attr); 2496 nla_nest_cancel(skb, rxsc_nest); 2497 nla_nest_cancel(skb, rxsc_list); 2498 goto nla_put_failure; 2499 } 2500 nla_nest_end(skb, attr); 2501 2502 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST); 2503 if (!rxsa_list) { 2504 nla_nest_cancel(skb, rxsc_nest); 2505 nla_nest_cancel(skb, rxsc_list); 2506 goto nla_put_failure; 2507 } 2508 2509 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 2510 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 2511 struct nlattr *rxsa_nest; 2512 2513 if (!rx_sa) 2514 continue; 2515 2516 rxsa_nest = nla_nest_start(skb, k++); 2517 if (!rxsa_nest) { 2518 nla_nest_cancel(skb, rxsa_list); 2519 nla_nest_cancel(skb, rxsc_nest); 2520 nla_nest_cancel(skb, rxsc_list); 2521 goto nla_put_failure; 2522 } 2523 2524 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS); 2525 if (!attr) { 2526 nla_nest_cancel(skb, rxsa_list); 2527 nla_nest_cancel(skb, rxsc_nest); 2528 nla_nest_cancel(skb, rxsc_list); 2529 goto nla_put_failure; 2530 } 2531 if (copy_rx_sa_stats(skb, rx_sa->stats)) { 2532 nla_nest_cancel(skb, attr); 2533 nla_nest_cancel(skb, rxsa_list); 2534 nla_nest_cancel(skb, rxsc_nest); 2535 nla_nest_cancel(skb, rxsc_list); 2536 goto nla_put_failure; 2537 } 2538 nla_nest_end(skb, attr); 2539 2540 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2541 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) || 2542 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 2543 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 2544 nla_nest_cancel(skb, rxsa_nest); 2545 nla_nest_cancel(skb, rxsc_nest); 2546 nla_nest_cancel(skb, rxsc_list); 2547 goto nla_put_failure; 2548 } 2549 nla_nest_end(skb, rxsa_nest); 2550 } 2551 2552 nla_nest_end(skb, rxsa_list); 2553 nla_nest_end(skb, rxsc_nest); 2554 } 2555 2556 nla_nest_end(skb, rxsc_list); 2557 2558 genlmsg_end(skb, hdr); 2559 2560 return 0; 2561 2562 nla_put_failure: 2563 genlmsg_cancel(skb, hdr); 2564 return -EMSGSIZE; 2565 } 2566 2567 static int macsec_generation = 1; /* protected by RTNL */ 2568 2569 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 2570 { 2571 struct net *net = sock_net(skb->sk); 2572 struct net_device *dev; 2573 int dev_idx, d; 2574 2575 dev_idx = cb->args[0]; 2576 2577 d = 0; 2578 rtnl_lock(); 2579 2580 cb->seq = macsec_generation; 2581 2582 for_each_netdev(net, dev) { 2583 struct macsec_secy *secy; 2584 2585 if (d < dev_idx) 2586 goto next; 2587 2588 if (!netif_is_macsec(dev)) 2589 goto next; 2590 2591 secy = &macsec_priv(dev)->secy; 2592 if (dump_secy(secy, dev, skb, cb) < 0) 2593 goto done; 2594 next: 2595 d++; 2596 } 2597 2598 done: 2599 rtnl_unlock(); 2600 cb->args[0] = d; 2601 return skb->len; 2602 } 2603 2604 static const struct genl_ops macsec_genl_ops[] = { 2605 { 2606 .cmd = MACSEC_CMD_GET_TXSC, 2607 .dumpit = macsec_dump_txsc, 2608 .policy = macsec_genl_policy, 2609 }, 2610 { 2611 .cmd = MACSEC_CMD_ADD_RXSC, 2612 .doit = macsec_add_rxsc, 2613 .policy = macsec_genl_policy, 2614 .flags = GENL_ADMIN_PERM, 2615 }, 2616 { 2617 .cmd = MACSEC_CMD_DEL_RXSC, 2618 .doit = macsec_del_rxsc, 2619 .policy = macsec_genl_policy, 2620 .flags = GENL_ADMIN_PERM, 2621 }, 2622 { 2623 .cmd = MACSEC_CMD_UPD_RXSC, 2624 .doit = macsec_upd_rxsc, 2625 .policy = macsec_genl_policy, 2626 .flags = GENL_ADMIN_PERM, 2627 }, 2628 { 2629 .cmd = MACSEC_CMD_ADD_TXSA, 2630 .doit = macsec_add_txsa, 2631 .policy = macsec_genl_policy, 2632 .flags = GENL_ADMIN_PERM, 2633 }, 2634 { 2635 .cmd = MACSEC_CMD_DEL_TXSA, 2636 .doit = macsec_del_txsa, 2637 .policy = macsec_genl_policy, 2638 .flags = GENL_ADMIN_PERM, 2639 }, 2640 { 2641 .cmd = MACSEC_CMD_UPD_TXSA, 2642 .doit = macsec_upd_txsa, 2643 .policy = macsec_genl_policy, 2644 .flags = GENL_ADMIN_PERM, 2645 }, 2646 { 2647 .cmd = MACSEC_CMD_ADD_RXSA, 2648 .doit = macsec_add_rxsa, 2649 .policy = macsec_genl_policy, 2650 .flags = GENL_ADMIN_PERM, 2651 }, 2652 { 2653 .cmd = MACSEC_CMD_DEL_RXSA, 2654 .doit = macsec_del_rxsa, 2655 .policy = macsec_genl_policy, 2656 .flags = GENL_ADMIN_PERM, 2657 }, 2658 { 2659 .cmd = MACSEC_CMD_UPD_RXSA, 2660 .doit = macsec_upd_rxsa, 2661 .policy = macsec_genl_policy, 2662 .flags = GENL_ADMIN_PERM, 2663 }, 2664 }; 2665 2666 static struct genl_family macsec_fam __ro_after_init = { 2667 .name = MACSEC_GENL_NAME, 2668 .hdrsize = 0, 2669 .version = MACSEC_GENL_VERSION, 2670 .maxattr = MACSEC_ATTR_MAX, 2671 .netnsok = true, 2672 .module = THIS_MODULE, 2673 .ops = macsec_genl_ops, 2674 .n_ops = ARRAY_SIZE(macsec_genl_ops), 2675 }; 2676 2677 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 2678 struct net_device *dev) 2679 { 2680 struct macsec_dev *macsec = netdev_priv(dev); 2681 struct macsec_secy *secy = &macsec->secy; 2682 struct pcpu_secy_stats *secy_stats; 2683 int ret, len; 2684 2685 /* 10.5 */ 2686 if (!secy->protect_frames) { 2687 secy_stats = this_cpu_ptr(macsec->stats); 2688 u64_stats_update_begin(&secy_stats->syncp); 2689 secy_stats->stats.OutPktsUntagged++; 2690 u64_stats_update_end(&secy_stats->syncp); 2691 skb->dev = macsec->real_dev; 2692 len = skb->len; 2693 ret = dev_queue_xmit(skb); 2694 count_tx(dev, ret, len); 2695 return ret; 2696 } 2697 2698 if (!secy->operational) { 2699 kfree_skb(skb); 2700 dev->stats.tx_dropped++; 2701 return NETDEV_TX_OK; 2702 } 2703 2704 skb = macsec_encrypt(skb, dev); 2705 if (IS_ERR(skb)) { 2706 if (PTR_ERR(skb) != -EINPROGRESS) 2707 dev->stats.tx_dropped++; 2708 return NETDEV_TX_OK; 2709 } 2710 2711 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 2712 2713 macsec_encrypt_finish(skb, dev); 2714 len = skb->len; 2715 ret = dev_queue_xmit(skb); 2716 count_tx(dev, ret, len); 2717 return ret; 2718 } 2719 2720 #define MACSEC_FEATURES \ 2721 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 2722 static struct lock_class_key macsec_netdev_addr_lock_key; 2723 2724 static int macsec_dev_init(struct net_device *dev) 2725 { 2726 struct macsec_dev *macsec = macsec_priv(dev); 2727 struct net_device *real_dev = macsec->real_dev; 2728 int err; 2729 2730 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2731 if (!dev->tstats) 2732 return -ENOMEM; 2733 2734 err = gro_cells_init(&macsec->gro_cells, dev); 2735 if (err) { 2736 free_percpu(dev->tstats); 2737 return err; 2738 } 2739 2740 dev->features = real_dev->features & MACSEC_FEATURES; 2741 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 2742 2743 dev->needed_headroom = real_dev->needed_headroom + 2744 MACSEC_NEEDED_HEADROOM; 2745 dev->needed_tailroom = real_dev->needed_tailroom + 2746 MACSEC_NEEDED_TAILROOM; 2747 2748 if (is_zero_ether_addr(dev->dev_addr)) 2749 eth_hw_addr_inherit(dev, real_dev); 2750 if (is_zero_ether_addr(dev->broadcast)) 2751 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 2752 2753 return 0; 2754 } 2755 2756 static void macsec_dev_uninit(struct net_device *dev) 2757 { 2758 struct macsec_dev *macsec = macsec_priv(dev); 2759 2760 gro_cells_destroy(&macsec->gro_cells); 2761 free_percpu(dev->tstats); 2762 } 2763 2764 static netdev_features_t macsec_fix_features(struct net_device *dev, 2765 netdev_features_t features) 2766 { 2767 struct macsec_dev *macsec = macsec_priv(dev); 2768 struct net_device *real_dev = macsec->real_dev; 2769 2770 features &= (real_dev->features & MACSEC_FEATURES) | 2771 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 2772 features |= NETIF_F_LLTX; 2773 2774 return features; 2775 } 2776 2777 static int macsec_dev_open(struct net_device *dev) 2778 { 2779 struct macsec_dev *macsec = macsec_priv(dev); 2780 struct net_device *real_dev = macsec->real_dev; 2781 int err; 2782 2783 if (!(real_dev->flags & IFF_UP)) 2784 return -ENETDOWN; 2785 2786 err = dev_uc_add(real_dev, dev->dev_addr); 2787 if (err < 0) 2788 return err; 2789 2790 if (dev->flags & IFF_ALLMULTI) { 2791 err = dev_set_allmulti(real_dev, 1); 2792 if (err < 0) 2793 goto del_unicast; 2794 } 2795 2796 if (dev->flags & IFF_PROMISC) { 2797 err = dev_set_promiscuity(real_dev, 1); 2798 if (err < 0) 2799 goto clear_allmulti; 2800 } 2801 2802 if (netif_carrier_ok(real_dev)) 2803 netif_carrier_on(dev); 2804 2805 return 0; 2806 clear_allmulti: 2807 if (dev->flags & IFF_ALLMULTI) 2808 dev_set_allmulti(real_dev, -1); 2809 del_unicast: 2810 dev_uc_del(real_dev, dev->dev_addr); 2811 netif_carrier_off(dev); 2812 return err; 2813 } 2814 2815 static int macsec_dev_stop(struct net_device *dev) 2816 { 2817 struct macsec_dev *macsec = macsec_priv(dev); 2818 struct net_device *real_dev = macsec->real_dev; 2819 2820 netif_carrier_off(dev); 2821 2822 dev_mc_unsync(real_dev, dev); 2823 dev_uc_unsync(real_dev, dev); 2824 2825 if (dev->flags & IFF_ALLMULTI) 2826 dev_set_allmulti(real_dev, -1); 2827 2828 if (dev->flags & IFF_PROMISC) 2829 dev_set_promiscuity(real_dev, -1); 2830 2831 dev_uc_del(real_dev, dev->dev_addr); 2832 2833 return 0; 2834 } 2835 2836 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 2837 { 2838 struct net_device *real_dev = macsec_priv(dev)->real_dev; 2839 2840 if (!(dev->flags & IFF_UP)) 2841 return; 2842 2843 if (change & IFF_ALLMULTI) 2844 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 2845 2846 if (change & IFF_PROMISC) 2847 dev_set_promiscuity(real_dev, 2848 dev->flags & IFF_PROMISC ? 1 : -1); 2849 } 2850 2851 static void macsec_dev_set_rx_mode(struct net_device *dev) 2852 { 2853 struct net_device *real_dev = macsec_priv(dev)->real_dev; 2854 2855 dev_mc_sync(real_dev, dev); 2856 dev_uc_sync(real_dev, dev); 2857 } 2858 2859 static int macsec_set_mac_address(struct net_device *dev, void *p) 2860 { 2861 struct macsec_dev *macsec = macsec_priv(dev); 2862 struct net_device *real_dev = macsec->real_dev; 2863 struct sockaddr *addr = p; 2864 int err; 2865 2866 if (!is_valid_ether_addr(addr->sa_data)) 2867 return -EADDRNOTAVAIL; 2868 2869 if (!(dev->flags & IFF_UP)) 2870 goto out; 2871 2872 err = dev_uc_add(real_dev, addr->sa_data); 2873 if (err < 0) 2874 return err; 2875 2876 dev_uc_del(real_dev, dev->dev_addr); 2877 2878 out: 2879 ether_addr_copy(dev->dev_addr, addr->sa_data); 2880 return 0; 2881 } 2882 2883 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 2884 { 2885 struct macsec_dev *macsec = macsec_priv(dev); 2886 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 2887 2888 if (macsec->real_dev->mtu - extra < new_mtu) 2889 return -ERANGE; 2890 2891 dev->mtu = new_mtu; 2892 2893 return 0; 2894 } 2895 2896 static void macsec_get_stats64(struct net_device *dev, 2897 struct rtnl_link_stats64 *s) 2898 { 2899 int cpu; 2900 2901 if (!dev->tstats) 2902 return; 2903 2904 for_each_possible_cpu(cpu) { 2905 struct pcpu_sw_netstats *stats; 2906 struct pcpu_sw_netstats tmp; 2907 int start; 2908 2909 stats = per_cpu_ptr(dev->tstats, cpu); 2910 do { 2911 start = u64_stats_fetch_begin_irq(&stats->syncp); 2912 tmp.rx_packets = stats->rx_packets; 2913 tmp.rx_bytes = stats->rx_bytes; 2914 tmp.tx_packets = stats->tx_packets; 2915 tmp.tx_bytes = stats->tx_bytes; 2916 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2917 2918 s->rx_packets += tmp.rx_packets; 2919 s->rx_bytes += tmp.rx_bytes; 2920 s->tx_packets += tmp.tx_packets; 2921 s->tx_bytes += tmp.tx_bytes; 2922 } 2923 2924 s->rx_dropped = dev->stats.rx_dropped; 2925 s->tx_dropped = dev->stats.tx_dropped; 2926 } 2927 2928 static int macsec_get_iflink(const struct net_device *dev) 2929 { 2930 return macsec_priv(dev)->real_dev->ifindex; 2931 } 2932 2933 2934 static int macsec_get_nest_level(struct net_device *dev) 2935 { 2936 return macsec_priv(dev)->nest_level; 2937 } 2938 2939 2940 static const struct net_device_ops macsec_netdev_ops = { 2941 .ndo_init = macsec_dev_init, 2942 .ndo_uninit = macsec_dev_uninit, 2943 .ndo_open = macsec_dev_open, 2944 .ndo_stop = macsec_dev_stop, 2945 .ndo_fix_features = macsec_fix_features, 2946 .ndo_change_mtu = macsec_change_mtu, 2947 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 2948 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 2949 .ndo_set_mac_address = macsec_set_mac_address, 2950 .ndo_start_xmit = macsec_start_xmit, 2951 .ndo_get_stats64 = macsec_get_stats64, 2952 .ndo_get_iflink = macsec_get_iflink, 2953 .ndo_get_lock_subclass = macsec_get_nest_level, 2954 }; 2955 2956 static const struct device_type macsec_type = { 2957 .name = "macsec", 2958 }; 2959 2960 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 2961 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 2962 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 2963 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 2964 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 2965 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 2966 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 2967 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 2968 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 2969 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 2970 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 2971 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 2972 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 2973 }; 2974 2975 static void macsec_free_netdev(struct net_device *dev) 2976 { 2977 struct macsec_dev *macsec = macsec_priv(dev); 2978 struct net_device *real_dev = macsec->real_dev; 2979 2980 free_percpu(macsec->stats); 2981 free_percpu(macsec->secy.tx_sc.stats); 2982 2983 dev_put(real_dev); 2984 free_netdev(dev); 2985 } 2986 2987 static void macsec_setup(struct net_device *dev) 2988 { 2989 ether_setup(dev); 2990 dev->min_mtu = 0; 2991 dev->max_mtu = ETH_MAX_MTU; 2992 dev->priv_flags |= IFF_NO_QUEUE; 2993 dev->netdev_ops = &macsec_netdev_ops; 2994 dev->destructor = macsec_free_netdev; 2995 SET_NETDEV_DEVTYPE(dev, &macsec_type); 2996 2997 eth_zero_addr(dev->broadcast); 2998 } 2999 3000 static void macsec_changelink_common(struct net_device *dev, 3001 struct nlattr *data[]) 3002 { 3003 struct macsec_secy *secy; 3004 struct macsec_tx_sc *tx_sc; 3005 3006 secy = &macsec_priv(dev)->secy; 3007 tx_sc = &secy->tx_sc; 3008 3009 if (data[IFLA_MACSEC_ENCODING_SA]) { 3010 struct macsec_tx_sa *tx_sa; 3011 3012 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3013 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 3014 3015 secy->operational = tx_sa && tx_sa->active; 3016 } 3017 3018 if (data[IFLA_MACSEC_WINDOW]) 3019 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3020 3021 if (data[IFLA_MACSEC_ENCRYPT]) 3022 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3023 3024 if (data[IFLA_MACSEC_PROTECT]) 3025 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3026 3027 if (data[IFLA_MACSEC_INC_SCI]) 3028 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3029 3030 if (data[IFLA_MACSEC_ES]) 3031 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3032 3033 if (data[IFLA_MACSEC_SCB]) 3034 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3035 3036 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3037 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3038 3039 if (data[IFLA_MACSEC_VALIDATION]) 3040 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3041 } 3042 3043 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3044 struct nlattr *data[]) 3045 { 3046 if (!data) 3047 return 0; 3048 3049 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3050 data[IFLA_MACSEC_ICV_LEN] || 3051 data[IFLA_MACSEC_SCI] || 3052 data[IFLA_MACSEC_PORT]) 3053 return -EINVAL; 3054 3055 macsec_changelink_common(dev, data); 3056 3057 return 0; 3058 } 3059 3060 static void macsec_del_dev(struct macsec_dev *macsec) 3061 { 3062 int i; 3063 3064 while (macsec->secy.rx_sc) { 3065 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 3066 3067 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 3068 free_rx_sc(rx_sc); 3069 } 3070 3071 for (i = 0; i < MACSEC_NUM_AN; i++) { 3072 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 3073 3074 if (sa) { 3075 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 3076 clear_tx_sa(sa); 3077 } 3078 } 3079 } 3080 3081 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 3082 { 3083 struct macsec_dev *macsec = macsec_priv(dev); 3084 struct net_device *real_dev = macsec->real_dev; 3085 3086 unregister_netdevice_queue(dev, head); 3087 list_del_rcu(&macsec->secys); 3088 macsec_del_dev(macsec); 3089 netdev_upper_dev_unlink(real_dev, dev); 3090 3091 macsec_generation++; 3092 } 3093 3094 static void macsec_dellink(struct net_device *dev, struct list_head *head) 3095 { 3096 struct macsec_dev *macsec = macsec_priv(dev); 3097 struct net_device *real_dev = macsec->real_dev; 3098 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3099 3100 macsec_common_dellink(dev, head); 3101 3102 if (list_empty(&rxd->secys)) { 3103 netdev_rx_handler_unregister(real_dev); 3104 kfree(rxd); 3105 } 3106 } 3107 3108 static int register_macsec_dev(struct net_device *real_dev, 3109 struct net_device *dev) 3110 { 3111 struct macsec_dev *macsec = macsec_priv(dev); 3112 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3113 3114 if (!rxd) { 3115 int err; 3116 3117 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 3118 if (!rxd) 3119 return -ENOMEM; 3120 3121 INIT_LIST_HEAD(&rxd->secys); 3122 3123 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 3124 rxd); 3125 if (err < 0) { 3126 kfree(rxd); 3127 return err; 3128 } 3129 } 3130 3131 list_add_tail_rcu(&macsec->secys, &rxd->secys); 3132 return 0; 3133 } 3134 3135 static bool sci_exists(struct net_device *dev, sci_t sci) 3136 { 3137 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 3138 struct macsec_dev *macsec; 3139 3140 list_for_each_entry(macsec, &rxd->secys, secys) { 3141 if (macsec->secy.sci == sci) 3142 return true; 3143 } 3144 3145 return false; 3146 } 3147 3148 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 3149 { 3150 return make_sci(dev->dev_addr, port); 3151 } 3152 3153 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 3154 { 3155 struct macsec_dev *macsec = macsec_priv(dev); 3156 struct macsec_secy *secy = &macsec->secy; 3157 3158 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 3159 if (!macsec->stats) 3160 return -ENOMEM; 3161 3162 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 3163 if (!secy->tx_sc.stats) { 3164 free_percpu(macsec->stats); 3165 return -ENOMEM; 3166 } 3167 3168 if (sci == MACSEC_UNDEF_SCI) 3169 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3170 3171 secy->netdev = dev; 3172 secy->operational = true; 3173 secy->key_len = DEFAULT_SAK_LEN; 3174 secy->icv_len = icv_len; 3175 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 3176 secy->protect_frames = true; 3177 secy->replay_protect = false; 3178 3179 secy->sci = sci; 3180 secy->tx_sc.active = true; 3181 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 3182 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 3183 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 3184 secy->tx_sc.end_station = false; 3185 secy->tx_sc.scb = false; 3186 3187 return 0; 3188 } 3189 3190 static int macsec_newlink(struct net *net, struct net_device *dev, 3191 struct nlattr *tb[], struct nlattr *data[]) 3192 { 3193 struct macsec_dev *macsec = macsec_priv(dev); 3194 struct net_device *real_dev; 3195 int err; 3196 sci_t sci; 3197 u8 icv_len = DEFAULT_ICV_LEN; 3198 rx_handler_func_t *rx_handler; 3199 3200 if (!tb[IFLA_LINK]) 3201 return -EINVAL; 3202 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 3203 if (!real_dev) 3204 return -ENODEV; 3205 3206 dev->priv_flags |= IFF_MACSEC; 3207 3208 macsec->real_dev = real_dev; 3209 3210 if (data && data[IFLA_MACSEC_ICV_LEN]) 3211 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3212 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 3213 3214 rx_handler = rtnl_dereference(real_dev->rx_handler); 3215 if (rx_handler && rx_handler != macsec_handle_frame) 3216 return -EBUSY; 3217 3218 err = register_netdevice(dev); 3219 if (err < 0) 3220 return err; 3221 3222 dev_hold(real_dev); 3223 3224 macsec->nest_level = dev_get_nest_level(real_dev) + 1; 3225 netdev_lockdep_set_classes(dev); 3226 lockdep_set_class_and_subclass(&dev->addr_list_lock, 3227 &macsec_netdev_addr_lock_key, 3228 macsec_get_nest_level(dev)); 3229 3230 err = netdev_upper_dev_link(real_dev, dev); 3231 if (err < 0) 3232 goto unregister; 3233 3234 /* need to be already registered so that ->init has run and 3235 * the MAC addr is set 3236 */ 3237 if (data && data[IFLA_MACSEC_SCI]) 3238 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 3239 else if (data && data[IFLA_MACSEC_PORT]) 3240 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 3241 else 3242 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3243 3244 if (rx_handler && sci_exists(real_dev, sci)) { 3245 err = -EBUSY; 3246 goto unlink; 3247 } 3248 3249 err = macsec_add_dev(dev, sci, icv_len); 3250 if (err) 3251 goto unlink; 3252 3253 if (data) 3254 macsec_changelink_common(dev, data); 3255 3256 err = register_macsec_dev(real_dev, dev); 3257 if (err < 0) 3258 goto del_dev; 3259 3260 macsec_generation++; 3261 3262 return 0; 3263 3264 del_dev: 3265 macsec_del_dev(macsec); 3266 unlink: 3267 netdev_upper_dev_unlink(real_dev, dev); 3268 unregister: 3269 unregister_netdevice(dev); 3270 return err; 3271 } 3272 3273 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[]) 3274 { 3275 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 3276 u8 icv_len = DEFAULT_ICV_LEN; 3277 int flag; 3278 bool es, scb, sci; 3279 3280 if (!data) 3281 return 0; 3282 3283 if (data[IFLA_MACSEC_CIPHER_SUITE]) 3284 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 3285 3286 if (data[IFLA_MACSEC_ICV_LEN]) { 3287 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3288 if (icv_len != DEFAULT_ICV_LEN) { 3289 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 3290 struct crypto_aead *dummy_tfm; 3291 3292 dummy_tfm = macsec_alloc_tfm(dummy_key, 3293 DEFAULT_SAK_LEN, 3294 icv_len); 3295 if (IS_ERR(dummy_tfm)) 3296 return PTR_ERR(dummy_tfm); 3297 crypto_free_aead(dummy_tfm); 3298 } 3299 } 3300 3301 switch (csid) { 3302 case MACSEC_DEFAULT_CIPHER_ID: 3303 case MACSEC_DEFAULT_CIPHER_ALT: 3304 if (icv_len < MACSEC_MIN_ICV_LEN || 3305 icv_len > MACSEC_STD_ICV_LEN) 3306 return -EINVAL; 3307 break; 3308 default: 3309 return -EINVAL; 3310 } 3311 3312 if (data[IFLA_MACSEC_ENCODING_SA]) { 3313 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 3314 return -EINVAL; 3315 } 3316 3317 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 3318 flag < IFLA_MACSEC_VALIDATION; 3319 flag++) { 3320 if (data[flag]) { 3321 if (nla_get_u8(data[flag]) > 1) 3322 return -EINVAL; 3323 } 3324 } 3325 3326 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 3327 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 3328 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 3329 3330 if ((sci && (scb || es)) || (scb && es)) 3331 return -EINVAL; 3332 3333 if (data[IFLA_MACSEC_VALIDATION] && 3334 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 3335 return -EINVAL; 3336 3337 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 3338 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 3339 !data[IFLA_MACSEC_WINDOW]) 3340 return -EINVAL; 3341 3342 return 0; 3343 } 3344 3345 static struct net *macsec_get_link_net(const struct net_device *dev) 3346 { 3347 return dev_net(macsec_priv(dev)->real_dev); 3348 } 3349 3350 static size_t macsec_get_size(const struct net_device *dev) 3351 { 3352 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ 3353 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ 3354 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ 3355 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ 3356 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ 3357 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ 3358 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ 3359 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ 3360 nla_total_size(1) + /* IFLA_MACSEC_ES */ 3361 nla_total_size(1) + /* IFLA_MACSEC_SCB */ 3362 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ 3363 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ 3364 0; 3365 } 3366 3367 static int macsec_fill_info(struct sk_buff *skb, 3368 const struct net_device *dev) 3369 { 3370 struct macsec_secy *secy = &macsec_priv(dev)->secy; 3371 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3372 3373 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 3374 IFLA_MACSEC_PAD) || 3375 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 3376 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 3377 MACSEC_DEFAULT_CIPHER_ID, IFLA_MACSEC_PAD) || 3378 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 3379 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 3380 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 3381 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 3382 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 3383 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 3384 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 3385 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 3386 0) 3387 goto nla_put_failure; 3388 3389 if (secy->replay_protect) { 3390 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 3391 goto nla_put_failure; 3392 } 3393 3394 return 0; 3395 3396 nla_put_failure: 3397 return -EMSGSIZE; 3398 } 3399 3400 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 3401 .kind = "macsec", 3402 .priv_size = sizeof(struct macsec_dev), 3403 .maxtype = IFLA_MACSEC_MAX, 3404 .policy = macsec_rtnl_policy, 3405 .setup = macsec_setup, 3406 .validate = macsec_validate_attr, 3407 .newlink = macsec_newlink, 3408 .changelink = macsec_changelink, 3409 .dellink = macsec_dellink, 3410 .get_size = macsec_get_size, 3411 .fill_info = macsec_fill_info, 3412 .get_link_net = macsec_get_link_net, 3413 }; 3414 3415 static bool is_macsec_master(struct net_device *dev) 3416 { 3417 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 3418 } 3419 3420 static int macsec_notify(struct notifier_block *this, unsigned long event, 3421 void *ptr) 3422 { 3423 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 3424 LIST_HEAD(head); 3425 3426 if (!is_macsec_master(real_dev)) 3427 return NOTIFY_DONE; 3428 3429 switch (event) { 3430 case NETDEV_UNREGISTER: { 3431 struct macsec_dev *m, *n; 3432 struct macsec_rxh_data *rxd; 3433 3434 rxd = macsec_data_rtnl(real_dev); 3435 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 3436 macsec_common_dellink(m->secy.netdev, &head); 3437 } 3438 3439 netdev_rx_handler_unregister(real_dev); 3440 kfree(rxd); 3441 3442 unregister_netdevice_many(&head); 3443 break; 3444 } 3445 case NETDEV_CHANGEMTU: { 3446 struct macsec_dev *m; 3447 struct macsec_rxh_data *rxd; 3448 3449 rxd = macsec_data_rtnl(real_dev); 3450 list_for_each_entry(m, &rxd->secys, secys) { 3451 struct net_device *dev = m->secy.netdev; 3452 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 3453 macsec_extra_len(true)); 3454 3455 if (dev->mtu > mtu) 3456 dev_set_mtu(dev, mtu); 3457 } 3458 } 3459 } 3460 3461 return NOTIFY_OK; 3462 } 3463 3464 static struct notifier_block macsec_notifier = { 3465 .notifier_call = macsec_notify, 3466 }; 3467 3468 static int __init macsec_init(void) 3469 { 3470 int err; 3471 3472 pr_info("MACsec IEEE 802.1AE\n"); 3473 err = register_netdevice_notifier(&macsec_notifier); 3474 if (err) 3475 return err; 3476 3477 err = rtnl_link_register(&macsec_link_ops); 3478 if (err) 3479 goto notifier; 3480 3481 err = genl_register_family(&macsec_fam); 3482 if (err) 3483 goto rtnl; 3484 3485 return 0; 3486 3487 rtnl: 3488 rtnl_link_unregister(&macsec_link_ops); 3489 notifier: 3490 unregister_netdevice_notifier(&macsec_notifier); 3491 return err; 3492 } 3493 3494 static void __exit macsec_exit(void) 3495 { 3496 genl_unregister_family(&macsec_fam); 3497 rtnl_link_unregister(&macsec_link_ops); 3498 unregister_netdevice_notifier(&macsec_notifier); 3499 rcu_barrier(); 3500 } 3501 3502 module_init(macsec_init); 3503 module_exit(macsec_exit); 3504 3505 MODULE_ALIAS_RTNL_LINK("macsec"); 3506 3507 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 3508 MODULE_LICENSE("GPL v2"); 3509