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 } 592 } 593 594 static void macsec_encrypt_done(struct crypto_async_request *base, int err) 595 { 596 struct sk_buff *skb = base->data; 597 struct net_device *dev = skb->dev; 598 struct macsec_dev *macsec = macsec_priv(dev); 599 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 600 int len, ret; 601 602 aead_request_free(macsec_skb_cb(skb)->req); 603 604 rcu_read_lock_bh(); 605 macsec_encrypt_finish(skb, dev); 606 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 607 len = skb->len; 608 ret = dev_queue_xmit(skb); 609 count_tx(dev, ret, len); 610 rcu_read_unlock_bh(); 611 612 macsec_txsa_put(sa); 613 dev_put(dev); 614 } 615 616 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, 617 unsigned char **iv, 618 struct scatterlist **sg, 619 int num_frags) 620 { 621 size_t size, iv_offset, sg_offset; 622 struct aead_request *req; 623 void *tmp; 624 625 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); 626 iv_offset = size; 627 size += GCM_AES_IV_LEN; 628 629 size = ALIGN(size, __alignof__(struct scatterlist)); 630 sg_offset = size; 631 size += sizeof(struct scatterlist) * num_frags; 632 633 tmp = kmalloc(size, GFP_ATOMIC); 634 if (!tmp) 635 return NULL; 636 637 *iv = (unsigned char *)(tmp + iv_offset); 638 *sg = (struct scatterlist *)(tmp + sg_offset); 639 req = tmp; 640 641 aead_request_set_tfm(req, tfm); 642 643 return req; 644 } 645 646 static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 647 struct net_device *dev) 648 { 649 int ret; 650 struct scatterlist *sg; 651 struct sk_buff *trailer; 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 = 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 ret = skb_cow_data(skb, 0, &trailer); 727 if (unlikely(ret < 0)) { 728 macsec_txsa_put(tx_sa); 729 kfree_skb(skb); 730 return ERR_PTR(ret); 731 } 732 733 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret); 734 if (!req) { 735 macsec_txsa_put(tx_sa); 736 kfree_skb(skb); 737 return ERR_PTR(-ENOMEM); 738 } 739 740 macsec_fill_iv(iv, secy->sci, pn); 741 742 sg_init_table(sg, ret); 743 ret = skb_to_sgvec(skb, sg, 0, skb->len); 744 if (unlikely(ret < 0)) { 745 aead_request_free(req); 746 macsec_txsa_put(tx_sa); 747 kfree_skb(skb); 748 return ERR_PTR(ret); 749 } 750 751 if (tx_sc->encrypt) { 752 int len = skb->len - macsec_hdr_len(sci_present) - 753 secy->icv_len; 754 aead_request_set_crypt(req, sg, sg, len, iv); 755 aead_request_set_ad(req, macsec_hdr_len(sci_present)); 756 } else { 757 aead_request_set_crypt(req, sg, sg, 0, iv); 758 aead_request_set_ad(req, skb->len - secy->icv_len); 759 } 760 761 macsec_skb_cb(skb)->req = req; 762 macsec_skb_cb(skb)->tx_sa = tx_sa; 763 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 764 765 dev_hold(skb->dev); 766 ret = crypto_aead_encrypt(req); 767 if (ret == -EINPROGRESS) { 768 return ERR_PTR(ret); 769 } else if (ret != 0) { 770 dev_put(skb->dev); 771 kfree_skb(skb); 772 aead_request_free(req); 773 macsec_txsa_put(tx_sa); 774 return ERR_PTR(-EINVAL); 775 } 776 777 dev_put(skb->dev); 778 aead_request_free(req); 779 macsec_txsa_put(tx_sa); 780 781 return skb; 782 } 783 784 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 785 { 786 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 787 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 788 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 789 u32 lowest_pn = 0; 790 791 spin_lock(&rx_sa->lock); 792 if (rx_sa->next_pn >= secy->replay_window) 793 lowest_pn = rx_sa->next_pn - secy->replay_window; 794 795 /* Now perform replay protection check again 796 * (see IEEE 802.1AE-2006 figure 10-5) 797 */ 798 if (secy->replay_protect && pn < lowest_pn) { 799 spin_unlock(&rx_sa->lock); 800 u64_stats_update_begin(&rxsc_stats->syncp); 801 rxsc_stats->stats.InPktsLate++; 802 u64_stats_update_end(&rxsc_stats->syncp); 803 return false; 804 } 805 806 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 807 u64_stats_update_begin(&rxsc_stats->syncp); 808 if (hdr->tci_an & MACSEC_TCI_E) 809 rxsc_stats->stats.InOctetsDecrypted += skb->len; 810 else 811 rxsc_stats->stats.InOctetsValidated += skb->len; 812 u64_stats_update_end(&rxsc_stats->syncp); 813 } 814 815 if (!macsec_skb_cb(skb)->valid) { 816 spin_unlock(&rx_sa->lock); 817 818 /* 10.6.5 */ 819 if (hdr->tci_an & MACSEC_TCI_C || 820 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 821 u64_stats_update_begin(&rxsc_stats->syncp); 822 rxsc_stats->stats.InPktsNotValid++; 823 u64_stats_update_end(&rxsc_stats->syncp); 824 return false; 825 } 826 827 u64_stats_update_begin(&rxsc_stats->syncp); 828 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 829 rxsc_stats->stats.InPktsInvalid++; 830 this_cpu_inc(rx_sa->stats->InPktsInvalid); 831 } else if (pn < lowest_pn) { 832 rxsc_stats->stats.InPktsDelayed++; 833 } else { 834 rxsc_stats->stats.InPktsUnchecked++; 835 } 836 u64_stats_update_end(&rxsc_stats->syncp); 837 } else { 838 u64_stats_update_begin(&rxsc_stats->syncp); 839 if (pn < lowest_pn) { 840 rxsc_stats->stats.InPktsDelayed++; 841 } else { 842 rxsc_stats->stats.InPktsOK++; 843 this_cpu_inc(rx_sa->stats->InPktsOK); 844 } 845 u64_stats_update_end(&rxsc_stats->syncp); 846 847 if (pn >= rx_sa->next_pn) 848 rx_sa->next_pn = pn + 1; 849 spin_unlock(&rx_sa->lock); 850 } 851 852 return true; 853 } 854 855 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 856 { 857 skb->pkt_type = PACKET_HOST; 858 skb->protocol = eth_type_trans(skb, dev); 859 860 skb_reset_network_header(skb); 861 if (!skb_transport_header_was_set(skb)) 862 skb_reset_transport_header(skb); 863 skb_reset_mac_len(skb); 864 } 865 866 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 867 { 868 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 869 skb_pull(skb, hdr_len); 870 pskb_trim_unique(skb, skb->len - icv_len); 871 } 872 873 static void count_rx(struct net_device *dev, int len) 874 { 875 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 876 877 u64_stats_update_begin(&stats->syncp); 878 stats->rx_packets++; 879 stats->rx_bytes += len; 880 u64_stats_update_end(&stats->syncp); 881 } 882 883 static void macsec_decrypt_done(struct crypto_async_request *base, int err) 884 { 885 struct sk_buff *skb = base->data; 886 struct net_device *dev = skb->dev; 887 struct macsec_dev *macsec = macsec_priv(dev); 888 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 889 struct macsec_rx_sc *rx_sc = rx_sa->sc; 890 int len; 891 u32 pn; 892 893 aead_request_free(macsec_skb_cb(skb)->req); 894 895 if (!err) 896 macsec_skb_cb(skb)->valid = true; 897 898 rcu_read_lock_bh(); 899 pn = ntohl(macsec_ethhdr(skb)->packet_number); 900 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 901 rcu_read_unlock_bh(); 902 kfree_skb(skb); 903 goto out; 904 } 905 906 macsec_finalize_skb(skb, macsec->secy.icv_len, 907 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 908 macsec_reset_skb(skb, macsec->secy.netdev); 909 910 len = skb->len; 911 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS) 912 count_rx(dev, len); 913 914 rcu_read_unlock_bh(); 915 916 out: 917 macsec_rxsa_put(rx_sa); 918 macsec_rxsc_put(rx_sc); 919 dev_put(dev); 920 } 921 922 static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 923 struct net_device *dev, 924 struct macsec_rx_sa *rx_sa, 925 sci_t sci, 926 struct macsec_secy *secy) 927 { 928 int ret; 929 struct scatterlist *sg; 930 struct sk_buff *trailer; 931 unsigned char *iv; 932 struct aead_request *req; 933 struct macsec_eth_header *hdr; 934 u16 icv_len = secy->icv_len; 935 936 macsec_skb_cb(skb)->valid = false; 937 skb = skb_share_check(skb, GFP_ATOMIC); 938 if (!skb) 939 return ERR_PTR(-ENOMEM); 940 941 ret = skb_cow_data(skb, 0, &trailer); 942 if (unlikely(ret < 0)) { 943 kfree_skb(skb); 944 return ERR_PTR(ret); 945 } 946 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret); 947 if (!req) { 948 kfree_skb(skb); 949 return ERR_PTR(-ENOMEM); 950 } 951 952 hdr = (struct macsec_eth_header *)skb->data; 953 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number)); 954 955 sg_init_table(sg, ret); 956 ret = skb_to_sgvec(skb, sg, 0, skb->len); 957 if (unlikely(ret < 0)) { 958 aead_request_free(req); 959 kfree_skb(skb); 960 return ERR_PTR(ret); 961 } 962 963 if (hdr->tci_an & MACSEC_TCI_E) { 964 /* confidentiality: ethernet + macsec header 965 * authenticated, encrypted payload 966 */ 967 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 968 969 aead_request_set_crypt(req, sg, sg, len, iv); 970 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 971 skb = skb_unshare(skb, GFP_ATOMIC); 972 if (!skb) { 973 aead_request_free(req); 974 return ERR_PTR(-ENOMEM); 975 } 976 } else { 977 /* integrity only: all headers + data authenticated */ 978 aead_request_set_crypt(req, sg, sg, icv_len, iv); 979 aead_request_set_ad(req, skb->len - icv_len); 980 } 981 982 macsec_skb_cb(skb)->req = req; 983 skb->dev = dev; 984 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 985 986 dev_hold(dev); 987 ret = crypto_aead_decrypt(req); 988 if (ret == -EINPROGRESS) { 989 return ERR_PTR(ret); 990 } else if (ret != 0) { 991 /* decryption/authentication failed 992 * 10.6 if validateFrames is disabled, deliver anyway 993 */ 994 if (ret != -EBADMSG) { 995 kfree_skb(skb); 996 skb = ERR_PTR(ret); 997 } 998 } else { 999 macsec_skb_cb(skb)->valid = true; 1000 } 1001 dev_put(dev); 1002 1003 aead_request_free(req); 1004 1005 return skb; 1006 } 1007 1008 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 1009 { 1010 struct macsec_rx_sc *rx_sc; 1011 1012 for_each_rxsc(secy, rx_sc) { 1013 if (rx_sc->sci == sci) 1014 return rx_sc; 1015 } 1016 1017 return NULL; 1018 } 1019 1020 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 1021 { 1022 struct macsec_rx_sc *rx_sc; 1023 1024 for_each_rxsc_rtnl(secy, rx_sc) { 1025 if (rx_sc->sci == sci) 1026 return rx_sc; 1027 } 1028 1029 return NULL; 1030 } 1031 1032 static void handle_not_macsec(struct sk_buff *skb) 1033 { 1034 struct macsec_rxh_data *rxd; 1035 struct macsec_dev *macsec; 1036 1037 rcu_read_lock(); 1038 rxd = macsec_data_rcu(skb->dev); 1039 1040 /* 10.6 If the management control validateFrames is not 1041 * Strict, frames without a SecTAG are received, counted, and 1042 * delivered to the Controlled Port 1043 */ 1044 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1045 struct sk_buff *nskb; 1046 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 1047 1048 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1049 u64_stats_update_begin(&secy_stats->syncp); 1050 secy_stats->stats.InPktsNoTag++; 1051 u64_stats_update_end(&secy_stats->syncp); 1052 continue; 1053 } 1054 1055 /* deliver on this port */ 1056 nskb = skb_clone(skb, GFP_ATOMIC); 1057 if (!nskb) 1058 break; 1059 1060 nskb->dev = macsec->secy.netdev; 1061 1062 if (netif_rx(nskb) == NET_RX_SUCCESS) { 1063 u64_stats_update_begin(&secy_stats->syncp); 1064 secy_stats->stats.InPktsUntagged++; 1065 u64_stats_update_end(&secy_stats->syncp); 1066 } 1067 } 1068 1069 rcu_read_unlock(); 1070 } 1071 1072 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 1073 { 1074 struct sk_buff *skb = *pskb; 1075 struct net_device *dev = skb->dev; 1076 struct macsec_eth_header *hdr; 1077 struct macsec_secy *secy = NULL; 1078 struct macsec_rx_sc *rx_sc; 1079 struct macsec_rx_sa *rx_sa; 1080 struct macsec_rxh_data *rxd; 1081 struct macsec_dev *macsec; 1082 sci_t sci; 1083 u32 pn; 1084 bool cbit; 1085 struct pcpu_rx_sc_stats *rxsc_stats; 1086 struct pcpu_secy_stats *secy_stats; 1087 bool pulled_sci; 1088 int ret; 1089 1090 if (skb_headroom(skb) < ETH_HLEN) 1091 goto drop_direct; 1092 1093 hdr = macsec_ethhdr(skb); 1094 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) { 1095 handle_not_macsec(skb); 1096 1097 /* and deliver to the uncontrolled port */ 1098 return RX_HANDLER_PASS; 1099 } 1100 1101 skb = skb_unshare(skb, GFP_ATOMIC); 1102 if (!skb) { 1103 *pskb = NULL; 1104 return RX_HANDLER_CONSUMED; 1105 } 1106 1107 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1108 if (!pulled_sci) { 1109 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1110 goto drop_direct; 1111 } 1112 1113 hdr = macsec_ethhdr(skb); 1114 1115 /* Frames with a SecTAG that has the TCI E bit set but the C 1116 * bit clear are discarded, as this reserved encoding is used 1117 * to identify frames with a SecTAG that are not to be 1118 * delivered to the Controlled Port. 1119 */ 1120 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1121 return RX_HANDLER_PASS; 1122 1123 /* now, pull the extra length */ 1124 if (hdr->tci_an & MACSEC_TCI_SC) { 1125 if (!pulled_sci) 1126 goto drop_direct; 1127 } 1128 1129 /* ethernet header is part of crypto processing */ 1130 skb_push(skb, ETH_HLEN); 1131 1132 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1133 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1134 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci); 1135 1136 rcu_read_lock(); 1137 rxd = macsec_data_rcu(skb->dev); 1138 1139 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1140 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1141 sc = sc ? macsec_rxsc_get(sc) : NULL; 1142 1143 if (sc) { 1144 secy = &macsec->secy; 1145 rx_sc = sc; 1146 break; 1147 } 1148 } 1149 1150 if (!secy) 1151 goto nosci; 1152 1153 dev = secy->netdev; 1154 macsec = macsec_priv(dev); 1155 secy_stats = this_cpu_ptr(macsec->stats); 1156 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1157 1158 if (!macsec_validate_skb(skb, secy->icv_len)) { 1159 u64_stats_update_begin(&secy_stats->syncp); 1160 secy_stats->stats.InPktsBadTag++; 1161 u64_stats_update_end(&secy_stats->syncp); 1162 goto drop_nosa; 1163 } 1164 1165 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1166 if (!rx_sa) { 1167 /* 10.6.1 if the SA is not in use */ 1168 1169 /* If validateFrames is Strict or the C bit in the 1170 * SecTAG is set, discard 1171 */ 1172 if (hdr->tci_an & MACSEC_TCI_C || 1173 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1174 u64_stats_update_begin(&rxsc_stats->syncp); 1175 rxsc_stats->stats.InPktsNotUsingSA++; 1176 u64_stats_update_end(&rxsc_stats->syncp); 1177 goto drop_nosa; 1178 } 1179 1180 /* not Strict, the frame (with the SecTAG and ICV 1181 * removed) is delivered to the Controlled Port. 1182 */ 1183 u64_stats_update_begin(&rxsc_stats->syncp); 1184 rxsc_stats->stats.InPktsUnusedSA++; 1185 u64_stats_update_end(&rxsc_stats->syncp); 1186 goto deliver; 1187 } 1188 1189 /* First, PN check to avoid decrypting obviously wrong packets */ 1190 pn = ntohl(hdr->packet_number); 1191 if (secy->replay_protect) { 1192 bool late; 1193 1194 spin_lock(&rx_sa->lock); 1195 late = rx_sa->next_pn >= secy->replay_window && 1196 pn < (rx_sa->next_pn - secy->replay_window); 1197 spin_unlock(&rx_sa->lock); 1198 1199 if (late) { 1200 u64_stats_update_begin(&rxsc_stats->syncp); 1201 rxsc_stats->stats.InPktsLate++; 1202 u64_stats_update_end(&rxsc_stats->syncp); 1203 goto drop; 1204 } 1205 } 1206 1207 macsec_skb_cb(skb)->rx_sa = rx_sa; 1208 1209 /* Disabled && !changed text => skip validation */ 1210 if (hdr->tci_an & MACSEC_TCI_C || 1211 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1212 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1213 1214 if (IS_ERR(skb)) { 1215 /* the decrypt callback needs the reference */ 1216 if (PTR_ERR(skb) != -EINPROGRESS) { 1217 macsec_rxsa_put(rx_sa); 1218 macsec_rxsc_put(rx_sc); 1219 } 1220 rcu_read_unlock(); 1221 *pskb = NULL; 1222 return RX_HANDLER_CONSUMED; 1223 } 1224 1225 if (!macsec_post_decrypt(skb, secy, pn)) 1226 goto drop; 1227 1228 deliver: 1229 macsec_finalize_skb(skb, secy->icv_len, 1230 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1231 macsec_reset_skb(skb, secy->netdev); 1232 1233 if (rx_sa) 1234 macsec_rxsa_put(rx_sa); 1235 macsec_rxsc_put(rx_sc); 1236 1237 ret = gro_cells_receive(&macsec->gro_cells, skb); 1238 if (ret == NET_RX_SUCCESS) 1239 count_rx(dev, skb->len); 1240 else 1241 macsec->secy.netdev->stats.rx_dropped++; 1242 1243 rcu_read_unlock(); 1244 1245 *pskb = NULL; 1246 return RX_HANDLER_CONSUMED; 1247 1248 drop: 1249 macsec_rxsa_put(rx_sa); 1250 drop_nosa: 1251 macsec_rxsc_put(rx_sc); 1252 rcu_read_unlock(); 1253 drop_direct: 1254 kfree_skb(skb); 1255 *pskb = NULL; 1256 return RX_HANDLER_CONSUMED; 1257 1258 nosci: 1259 /* 10.6.1 if the SC is not found */ 1260 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1261 if (!cbit) 1262 macsec_finalize_skb(skb, DEFAULT_ICV_LEN, 1263 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1264 1265 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1266 struct sk_buff *nskb; 1267 1268 secy_stats = this_cpu_ptr(macsec->stats); 1269 1270 /* If validateFrames is Strict or the C bit in the 1271 * SecTAG is set, discard 1272 */ 1273 if (cbit || 1274 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1275 u64_stats_update_begin(&secy_stats->syncp); 1276 secy_stats->stats.InPktsNoSCI++; 1277 u64_stats_update_end(&secy_stats->syncp); 1278 continue; 1279 } 1280 1281 /* not strict, the frame (with the SecTAG and ICV 1282 * removed) is delivered to the Controlled Port. 1283 */ 1284 nskb = skb_clone(skb, GFP_ATOMIC); 1285 if (!nskb) 1286 break; 1287 1288 macsec_reset_skb(nskb, macsec->secy.netdev); 1289 1290 ret = netif_rx(nskb); 1291 if (ret == NET_RX_SUCCESS) { 1292 u64_stats_update_begin(&secy_stats->syncp); 1293 secy_stats->stats.InPktsUnknownSCI++; 1294 u64_stats_update_end(&secy_stats->syncp); 1295 } else { 1296 macsec->secy.netdev->stats.rx_dropped++; 1297 } 1298 } 1299 1300 rcu_read_unlock(); 1301 *pskb = skb; 1302 return RX_HANDLER_PASS; 1303 } 1304 1305 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1306 { 1307 struct crypto_aead *tfm; 1308 int ret; 1309 1310 tfm = crypto_alloc_aead("gcm(aes)", 0, 0); 1311 1312 if (IS_ERR(tfm)) 1313 return tfm; 1314 1315 ret = crypto_aead_setkey(tfm, key, key_len); 1316 if (ret < 0) 1317 goto fail; 1318 1319 ret = crypto_aead_setauthsize(tfm, icv_len); 1320 if (ret < 0) 1321 goto fail; 1322 1323 return tfm; 1324 fail: 1325 crypto_free_aead(tfm); 1326 return ERR_PTR(ret); 1327 } 1328 1329 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1330 int icv_len) 1331 { 1332 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1333 if (!rx_sa->stats) 1334 return -ENOMEM; 1335 1336 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1337 if (IS_ERR(rx_sa->key.tfm)) { 1338 free_percpu(rx_sa->stats); 1339 return PTR_ERR(rx_sa->key.tfm); 1340 } 1341 1342 rx_sa->active = false; 1343 rx_sa->next_pn = 1; 1344 atomic_set(&rx_sa->refcnt, 1); 1345 spin_lock_init(&rx_sa->lock); 1346 1347 return 0; 1348 } 1349 1350 static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1351 { 1352 rx_sa->active = false; 1353 1354 macsec_rxsa_put(rx_sa); 1355 } 1356 1357 static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1358 { 1359 int i; 1360 1361 for (i = 0; i < MACSEC_NUM_AN; i++) { 1362 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1363 1364 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1365 if (sa) 1366 clear_rx_sa(sa); 1367 } 1368 1369 macsec_rxsc_put(rx_sc); 1370 } 1371 1372 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1373 { 1374 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1375 1376 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1377 rx_sc; 1378 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1379 if (rx_sc->sci == sci) { 1380 if (rx_sc->active) 1381 secy->n_rx_sc--; 1382 rcu_assign_pointer(*rx_scp, rx_sc->next); 1383 return rx_sc; 1384 } 1385 } 1386 1387 return NULL; 1388 } 1389 1390 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci) 1391 { 1392 struct macsec_rx_sc *rx_sc; 1393 struct macsec_dev *macsec; 1394 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1395 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1396 struct macsec_secy *secy; 1397 1398 list_for_each_entry(macsec, &rxd->secys, secys) { 1399 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1400 return ERR_PTR(-EEXIST); 1401 } 1402 1403 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL); 1404 if (!rx_sc) 1405 return ERR_PTR(-ENOMEM); 1406 1407 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1408 if (!rx_sc->stats) { 1409 kfree(rx_sc); 1410 return ERR_PTR(-ENOMEM); 1411 } 1412 1413 rx_sc->sci = sci; 1414 rx_sc->active = true; 1415 atomic_set(&rx_sc->refcnt, 1); 1416 1417 secy = &macsec_priv(dev)->secy; 1418 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1419 rcu_assign_pointer(secy->rx_sc, rx_sc); 1420 1421 if (rx_sc->active) 1422 secy->n_rx_sc++; 1423 1424 return rx_sc; 1425 } 1426 1427 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1428 int icv_len) 1429 { 1430 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1431 if (!tx_sa->stats) 1432 return -ENOMEM; 1433 1434 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1435 if (IS_ERR(tx_sa->key.tfm)) { 1436 free_percpu(tx_sa->stats); 1437 return PTR_ERR(tx_sa->key.tfm); 1438 } 1439 1440 tx_sa->active = false; 1441 atomic_set(&tx_sa->refcnt, 1); 1442 spin_lock_init(&tx_sa->lock); 1443 1444 return 0; 1445 } 1446 1447 static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1448 { 1449 tx_sa->active = false; 1450 1451 macsec_txsa_put(tx_sa); 1452 } 1453 1454 static struct genl_family macsec_fam; 1455 1456 static struct net_device *get_dev_from_nl(struct net *net, 1457 struct nlattr **attrs) 1458 { 1459 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1460 struct net_device *dev; 1461 1462 dev = __dev_get_by_index(net, ifindex); 1463 if (!dev) 1464 return ERR_PTR(-ENODEV); 1465 1466 if (!netif_is_macsec(dev)) 1467 return ERR_PTR(-ENODEV); 1468 1469 return dev; 1470 } 1471 1472 static sci_t nla_get_sci(const struct nlattr *nla) 1473 { 1474 return (__force sci_t)nla_get_u64(nla); 1475 } 1476 1477 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, 1478 int padattr) 1479 { 1480 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); 1481 } 1482 1483 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1484 struct nlattr **attrs, 1485 struct nlattr **tb_sa, 1486 struct net_device **devp, 1487 struct macsec_secy **secyp, 1488 struct macsec_tx_sc **scp, 1489 u8 *assoc_num) 1490 { 1491 struct net_device *dev; 1492 struct macsec_secy *secy; 1493 struct macsec_tx_sc *tx_sc; 1494 struct macsec_tx_sa *tx_sa; 1495 1496 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1497 return ERR_PTR(-EINVAL); 1498 1499 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1500 1501 dev = get_dev_from_nl(net, attrs); 1502 if (IS_ERR(dev)) 1503 return ERR_CAST(dev); 1504 1505 if (*assoc_num >= MACSEC_NUM_AN) 1506 return ERR_PTR(-EINVAL); 1507 1508 secy = &macsec_priv(dev)->secy; 1509 tx_sc = &secy->tx_sc; 1510 1511 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1512 if (!tx_sa) 1513 return ERR_PTR(-ENODEV); 1514 1515 *devp = dev; 1516 *scp = tx_sc; 1517 *secyp = secy; 1518 return tx_sa; 1519 } 1520 1521 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1522 struct nlattr **attrs, 1523 struct nlattr **tb_rxsc, 1524 struct net_device **devp, 1525 struct macsec_secy **secyp) 1526 { 1527 struct net_device *dev; 1528 struct macsec_secy *secy; 1529 struct macsec_rx_sc *rx_sc; 1530 sci_t sci; 1531 1532 dev = get_dev_from_nl(net, attrs); 1533 if (IS_ERR(dev)) 1534 return ERR_CAST(dev); 1535 1536 secy = &macsec_priv(dev)->secy; 1537 1538 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1539 return ERR_PTR(-EINVAL); 1540 1541 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1542 rx_sc = find_rx_sc_rtnl(secy, sci); 1543 if (!rx_sc) 1544 return ERR_PTR(-ENODEV); 1545 1546 *secyp = secy; 1547 *devp = dev; 1548 1549 return rx_sc; 1550 } 1551 1552 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1553 struct nlattr **attrs, 1554 struct nlattr **tb_rxsc, 1555 struct nlattr **tb_sa, 1556 struct net_device **devp, 1557 struct macsec_secy **secyp, 1558 struct macsec_rx_sc **scp, 1559 u8 *assoc_num) 1560 { 1561 struct macsec_rx_sc *rx_sc; 1562 struct macsec_rx_sa *rx_sa; 1563 1564 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1565 return ERR_PTR(-EINVAL); 1566 1567 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1568 if (*assoc_num >= MACSEC_NUM_AN) 1569 return ERR_PTR(-EINVAL); 1570 1571 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1572 if (IS_ERR(rx_sc)) 1573 return ERR_CAST(rx_sc); 1574 1575 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1576 if (!rx_sa) 1577 return ERR_PTR(-ENODEV); 1578 1579 *scp = rx_sc; 1580 return rx_sa; 1581 } 1582 1583 1584 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1585 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1586 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1587 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1588 }; 1589 1590 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1591 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1592 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, 1593 }; 1594 1595 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1596 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, 1597 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, 1598 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 }, 1599 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY, 1600 .len = MACSEC_KEYID_LEN, }, 1601 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1602 .len = MACSEC_MAX_KEY_LEN, }, 1603 }; 1604 1605 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1606 { 1607 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1608 return -EINVAL; 1609 1610 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, 1611 attrs[MACSEC_ATTR_SA_CONFIG], 1612 macsec_genl_sa_policy, NULL)) 1613 return -EINVAL; 1614 1615 return 0; 1616 } 1617 1618 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1619 { 1620 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1621 return -EINVAL; 1622 1623 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, 1624 attrs[MACSEC_ATTR_RXSC_CONFIG], 1625 macsec_genl_rxsc_policy, NULL)) 1626 return -EINVAL; 1627 1628 return 0; 1629 } 1630 1631 static bool validate_add_rxsa(struct nlattr **attrs) 1632 { 1633 if (!attrs[MACSEC_SA_ATTR_AN] || 1634 !attrs[MACSEC_SA_ATTR_KEY] || 1635 !attrs[MACSEC_SA_ATTR_KEYID]) 1636 return false; 1637 1638 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1639 return false; 1640 1641 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1642 return false; 1643 1644 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1645 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1646 return false; 1647 } 1648 1649 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1650 return false; 1651 1652 return true; 1653 } 1654 1655 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1656 { 1657 struct net_device *dev; 1658 struct nlattr **attrs = info->attrs; 1659 struct macsec_secy *secy; 1660 struct macsec_rx_sc *rx_sc; 1661 struct macsec_rx_sa *rx_sa; 1662 unsigned char assoc_num; 1663 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1664 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1665 int err; 1666 1667 if (!attrs[MACSEC_ATTR_IFINDEX]) 1668 return -EINVAL; 1669 1670 if (parse_sa_config(attrs, tb_sa)) 1671 return -EINVAL; 1672 1673 if (parse_rxsc_config(attrs, tb_rxsc)) 1674 return -EINVAL; 1675 1676 if (!validate_add_rxsa(tb_sa)) 1677 return -EINVAL; 1678 1679 rtnl_lock(); 1680 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1681 if (IS_ERR(rx_sc)) { 1682 rtnl_unlock(); 1683 return PTR_ERR(rx_sc); 1684 } 1685 1686 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1687 1688 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1689 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1690 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1691 rtnl_unlock(); 1692 return -EINVAL; 1693 } 1694 1695 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1696 if (rx_sa) { 1697 rtnl_unlock(); 1698 return -EBUSY; 1699 } 1700 1701 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1702 if (!rx_sa) { 1703 rtnl_unlock(); 1704 return -ENOMEM; 1705 } 1706 1707 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1708 secy->key_len, secy->icv_len); 1709 if (err < 0) { 1710 kfree(rx_sa); 1711 rtnl_unlock(); 1712 return err; 1713 } 1714 1715 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1716 spin_lock_bh(&rx_sa->lock); 1717 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1718 spin_unlock_bh(&rx_sa->lock); 1719 } 1720 1721 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1722 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1723 1724 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1725 rx_sa->sc = rx_sc; 1726 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1727 1728 rtnl_unlock(); 1729 1730 return 0; 1731 } 1732 1733 static bool validate_add_rxsc(struct nlattr **attrs) 1734 { 1735 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1736 return false; 1737 1738 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1739 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1740 return false; 1741 } 1742 1743 return true; 1744 } 1745 1746 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1747 { 1748 struct net_device *dev; 1749 sci_t sci = MACSEC_UNDEF_SCI; 1750 struct nlattr **attrs = info->attrs; 1751 struct macsec_rx_sc *rx_sc; 1752 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1753 1754 if (!attrs[MACSEC_ATTR_IFINDEX]) 1755 return -EINVAL; 1756 1757 if (parse_rxsc_config(attrs, tb_rxsc)) 1758 return -EINVAL; 1759 1760 if (!validate_add_rxsc(tb_rxsc)) 1761 return -EINVAL; 1762 1763 rtnl_lock(); 1764 dev = get_dev_from_nl(genl_info_net(info), attrs); 1765 if (IS_ERR(dev)) { 1766 rtnl_unlock(); 1767 return PTR_ERR(dev); 1768 } 1769 1770 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1771 1772 rx_sc = create_rx_sc(dev, sci); 1773 if (IS_ERR(rx_sc)) { 1774 rtnl_unlock(); 1775 return PTR_ERR(rx_sc); 1776 } 1777 1778 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1779 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1780 1781 rtnl_unlock(); 1782 1783 return 0; 1784 } 1785 1786 static bool validate_add_txsa(struct nlattr **attrs) 1787 { 1788 if (!attrs[MACSEC_SA_ATTR_AN] || 1789 !attrs[MACSEC_SA_ATTR_PN] || 1790 !attrs[MACSEC_SA_ATTR_KEY] || 1791 !attrs[MACSEC_SA_ATTR_KEYID]) 1792 return false; 1793 1794 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1795 return false; 1796 1797 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1798 return false; 1799 1800 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1801 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1802 return false; 1803 } 1804 1805 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1806 return false; 1807 1808 return true; 1809 } 1810 1811 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1812 { 1813 struct net_device *dev; 1814 struct nlattr **attrs = info->attrs; 1815 struct macsec_secy *secy; 1816 struct macsec_tx_sc *tx_sc; 1817 struct macsec_tx_sa *tx_sa; 1818 unsigned char assoc_num; 1819 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1820 int err; 1821 1822 if (!attrs[MACSEC_ATTR_IFINDEX]) 1823 return -EINVAL; 1824 1825 if (parse_sa_config(attrs, tb_sa)) 1826 return -EINVAL; 1827 1828 if (!validate_add_txsa(tb_sa)) 1829 return -EINVAL; 1830 1831 rtnl_lock(); 1832 dev = get_dev_from_nl(genl_info_net(info), attrs); 1833 if (IS_ERR(dev)) { 1834 rtnl_unlock(); 1835 return PTR_ERR(dev); 1836 } 1837 1838 secy = &macsec_priv(dev)->secy; 1839 tx_sc = &secy->tx_sc; 1840 1841 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1842 1843 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1844 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 1845 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1846 rtnl_unlock(); 1847 return -EINVAL; 1848 } 1849 1850 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 1851 if (tx_sa) { 1852 rtnl_unlock(); 1853 return -EBUSY; 1854 } 1855 1856 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 1857 if (!tx_sa) { 1858 rtnl_unlock(); 1859 return -ENOMEM; 1860 } 1861 1862 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1863 secy->key_len, secy->icv_len); 1864 if (err < 0) { 1865 kfree(tx_sa); 1866 rtnl_unlock(); 1867 return err; 1868 } 1869 1870 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1871 1872 spin_lock_bh(&tx_sa->lock); 1873 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1874 spin_unlock_bh(&tx_sa->lock); 1875 1876 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1877 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1878 1879 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 1880 secy->operational = true; 1881 1882 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 1883 1884 rtnl_unlock(); 1885 1886 return 0; 1887 } 1888 1889 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 1890 { 1891 struct nlattr **attrs = info->attrs; 1892 struct net_device *dev; 1893 struct macsec_secy *secy; 1894 struct macsec_rx_sc *rx_sc; 1895 struct macsec_rx_sa *rx_sa; 1896 u8 assoc_num; 1897 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1898 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1899 1900 if (!attrs[MACSEC_ATTR_IFINDEX]) 1901 return -EINVAL; 1902 1903 if (parse_sa_config(attrs, tb_sa)) 1904 return -EINVAL; 1905 1906 if (parse_rxsc_config(attrs, tb_rxsc)) 1907 return -EINVAL; 1908 1909 rtnl_lock(); 1910 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 1911 &dev, &secy, &rx_sc, &assoc_num); 1912 if (IS_ERR(rx_sa)) { 1913 rtnl_unlock(); 1914 return PTR_ERR(rx_sa); 1915 } 1916 1917 if (rx_sa->active) { 1918 rtnl_unlock(); 1919 return -EBUSY; 1920 } 1921 1922 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 1923 clear_rx_sa(rx_sa); 1924 1925 rtnl_unlock(); 1926 1927 return 0; 1928 } 1929 1930 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 1931 { 1932 struct nlattr **attrs = info->attrs; 1933 struct net_device *dev; 1934 struct macsec_secy *secy; 1935 struct macsec_rx_sc *rx_sc; 1936 sci_t sci; 1937 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1938 1939 if (!attrs[MACSEC_ATTR_IFINDEX]) 1940 return -EINVAL; 1941 1942 if (parse_rxsc_config(attrs, tb_rxsc)) 1943 return -EINVAL; 1944 1945 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1946 return -EINVAL; 1947 1948 rtnl_lock(); 1949 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 1950 if (IS_ERR(dev)) { 1951 rtnl_unlock(); 1952 return PTR_ERR(dev); 1953 } 1954 1955 secy = &macsec_priv(dev)->secy; 1956 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1957 1958 rx_sc = del_rx_sc(secy, sci); 1959 if (!rx_sc) { 1960 rtnl_unlock(); 1961 return -ENODEV; 1962 } 1963 1964 free_rx_sc(rx_sc); 1965 rtnl_unlock(); 1966 1967 return 0; 1968 } 1969 1970 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 1971 { 1972 struct nlattr **attrs = info->attrs; 1973 struct net_device *dev; 1974 struct macsec_secy *secy; 1975 struct macsec_tx_sc *tx_sc; 1976 struct macsec_tx_sa *tx_sa; 1977 u8 assoc_num; 1978 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1979 1980 if (!attrs[MACSEC_ATTR_IFINDEX]) 1981 return -EINVAL; 1982 1983 if (parse_sa_config(attrs, tb_sa)) 1984 return -EINVAL; 1985 1986 rtnl_lock(); 1987 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 1988 &dev, &secy, &tx_sc, &assoc_num); 1989 if (IS_ERR(tx_sa)) { 1990 rtnl_unlock(); 1991 return PTR_ERR(tx_sa); 1992 } 1993 1994 if (tx_sa->active) { 1995 rtnl_unlock(); 1996 return -EBUSY; 1997 } 1998 1999 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 2000 clear_tx_sa(tx_sa); 2001 2002 rtnl_unlock(); 2003 2004 return 0; 2005 } 2006 2007 static bool validate_upd_sa(struct nlattr **attrs) 2008 { 2009 if (!attrs[MACSEC_SA_ATTR_AN] || 2010 attrs[MACSEC_SA_ATTR_KEY] || 2011 attrs[MACSEC_SA_ATTR_KEYID]) 2012 return false; 2013 2014 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 2015 return false; 2016 2017 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 2018 return false; 2019 2020 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 2021 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 2022 return false; 2023 } 2024 2025 return true; 2026 } 2027 2028 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2029 { 2030 struct nlattr **attrs = info->attrs; 2031 struct net_device *dev; 2032 struct macsec_secy *secy; 2033 struct macsec_tx_sc *tx_sc; 2034 struct macsec_tx_sa *tx_sa; 2035 u8 assoc_num; 2036 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2037 2038 if (!attrs[MACSEC_ATTR_IFINDEX]) 2039 return -EINVAL; 2040 2041 if (parse_sa_config(attrs, tb_sa)) 2042 return -EINVAL; 2043 2044 if (!validate_upd_sa(tb_sa)) 2045 return -EINVAL; 2046 2047 rtnl_lock(); 2048 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2049 &dev, &secy, &tx_sc, &assoc_num); 2050 if (IS_ERR(tx_sa)) { 2051 rtnl_unlock(); 2052 return PTR_ERR(tx_sa); 2053 } 2054 2055 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2056 spin_lock_bh(&tx_sa->lock); 2057 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 2058 spin_unlock_bh(&tx_sa->lock); 2059 } 2060 2061 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2062 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2063 2064 if (assoc_num == tx_sc->encoding_sa) 2065 secy->operational = tx_sa->active; 2066 2067 rtnl_unlock(); 2068 2069 return 0; 2070 } 2071 2072 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2073 { 2074 struct nlattr **attrs = info->attrs; 2075 struct net_device *dev; 2076 struct macsec_secy *secy; 2077 struct macsec_rx_sc *rx_sc; 2078 struct macsec_rx_sa *rx_sa; 2079 u8 assoc_num; 2080 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2081 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2082 2083 if (!attrs[MACSEC_ATTR_IFINDEX]) 2084 return -EINVAL; 2085 2086 if (parse_rxsc_config(attrs, tb_rxsc)) 2087 return -EINVAL; 2088 2089 if (parse_sa_config(attrs, tb_sa)) 2090 return -EINVAL; 2091 2092 if (!validate_upd_sa(tb_sa)) 2093 return -EINVAL; 2094 2095 rtnl_lock(); 2096 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2097 &dev, &secy, &rx_sc, &assoc_num); 2098 if (IS_ERR(rx_sa)) { 2099 rtnl_unlock(); 2100 return PTR_ERR(rx_sa); 2101 } 2102 2103 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2104 spin_lock_bh(&rx_sa->lock); 2105 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 2106 spin_unlock_bh(&rx_sa->lock); 2107 } 2108 2109 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2110 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2111 2112 rtnl_unlock(); 2113 return 0; 2114 } 2115 2116 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2117 { 2118 struct nlattr **attrs = info->attrs; 2119 struct net_device *dev; 2120 struct macsec_secy *secy; 2121 struct macsec_rx_sc *rx_sc; 2122 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2123 2124 if (!attrs[MACSEC_ATTR_IFINDEX]) 2125 return -EINVAL; 2126 2127 if (parse_rxsc_config(attrs, tb_rxsc)) 2128 return -EINVAL; 2129 2130 if (!validate_add_rxsc(tb_rxsc)) 2131 return -EINVAL; 2132 2133 rtnl_lock(); 2134 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2135 if (IS_ERR(rx_sc)) { 2136 rtnl_unlock(); 2137 return PTR_ERR(rx_sc); 2138 } 2139 2140 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2141 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2142 2143 if (rx_sc->active != new) 2144 secy->n_rx_sc += new ? 1 : -1; 2145 2146 rx_sc->active = new; 2147 } 2148 2149 rtnl_unlock(); 2150 2151 return 0; 2152 } 2153 2154 static int copy_tx_sa_stats(struct sk_buff *skb, 2155 struct macsec_tx_sa_stats __percpu *pstats) 2156 { 2157 struct macsec_tx_sa_stats sum = {0, }; 2158 int cpu; 2159 2160 for_each_possible_cpu(cpu) { 2161 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2162 2163 sum.OutPktsProtected += stats->OutPktsProtected; 2164 sum.OutPktsEncrypted += stats->OutPktsEncrypted; 2165 } 2166 2167 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) || 2168 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted)) 2169 return -EMSGSIZE; 2170 2171 return 0; 2172 } 2173 2174 static int copy_rx_sa_stats(struct sk_buff *skb, 2175 struct macsec_rx_sa_stats __percpu *pstats) 2176 { 2177 struct macsec_rx_sa_stats sum = {0, }; 2178 int cpu; 2179 2180 for_each_possible_cpu(cpu) { 2181 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2182 2183 sum.InPktsOK += stats->InPktsOK; 2184 sum.InPktsInvalid += stats->InPktsInvalid; 2185 sum.InPktsNotValid += stats->InPktsNotValid; 2186 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA; 2187 sum.InPktsUnusedSA += stats->InPktsUnusedSA; 2188 } 2189 2190 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) || 2191 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) || 2192 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) || 2193 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) || 2194 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA)) 2195 return -EMSGSIZE; 2196 2197 return 0; 2198 } 2199 2200 static int copy_rx_sc_stats(struct sk_buff *skb, 2201 struct pcpu_rx_sc_stats __percpu *pstats) 2202 { 2203 struct macsec_rx_sc_stats sum = {0, }; 2204 int cpu; 2205 2206 for_each_possible_cpu(cpu) { 2207 const struct pcpu_rx_sc_stats *stats; 2208 struct macsec_rx_sc_stats tmp; 2209 unsigned int start; 2210 2211 stats = per_cpu_ptr(pstats, cpu); 2212 do { 2213 start = u64_stats_fetch_begin_irq(&stats->syncp); 2214 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2215 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2216 2217 sum.InOctetsValidated += tmp.InOctetsValidated; 2218 sum.InOctetsDecrypted += tmp.InOctetsDecrypted; 2219 sum.InPktsUnchecked += tmp.InPktsUnchecked; 2220 sum.InPktsDelayed += tmp.InPktsDelayed; 2221 sum.InPktsOK += tmp.InPktsOK; 2222 sum.InPktsInvalid += tmp.InPktsInvalid; 2223 sum.InPktsLate += tmp.InPktsLate; 2224 sum.InPktsNotValid += tmp.InPktsNotValid; 2225 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2226 sum.InPktsUnusedSA += tmp.InPktsUnusedSA; 2227 } 2228 2229 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2230 sum.InOctetsValidated, 2231 MACSEC_RXSC_STATS_ATTR_PAD) || 2232 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2233 sum.InOctetsDecrypted, 2234 MACSEC_RXSC_STATS_ATTR_PAD) || 2235 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2236 sum.InPktsUnchecked, 2237 MACSEC_RXSC_STATS_ATTR_PAD) || 2238 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2239 sum.InPktsDelayed, 2240 MACSEC_RXSC_STATS_ATTR_PAD) || 2241 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2242 sum.InPktsOK, 2243 MACSEC_RXSC_STATS_ATTR_PAD) || 2244 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2245 sum.InPktsInvalid, 2246 MACSEC_RXSC_STATS_ATTR_PAD) || 2247 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2248 sum.InPktsLate, 2249 MACSEC_RXSC_STATS_ATTR_PAD) || 2250 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2251 sum.InPktsNotValid, 2252 MACSEC_RXSC_STATS_ATTR_PAD) || 2253 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2254 sum.InPktsNotUsingSA, 2255 MACSEC_RXSC_STATS_ATTR_PAD) || 2256 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2257 sum.InPktsUnusedSA, 2258 MACSEC_RXSC_STATS_ATTR_PAD)) 2259 return -EMSGSIZE; 2260 2261 return 0; 2262 } 2263 2264 static int copy_tx_sc_stats(struct sk_buff *skb, 2265 struct pcpu_tx_sc_stats __percpu *pstats) 2266 { 2267 struct macsec_tx_sc_stats sum = {0, }; 2268 int cpu; 2269 2270 for_each_possible_cpu(cpu) { 2271 const struct pcpu_tx_sc_stats *stats; 2272 struct macsec_tx_sc_stats tmp; 2273 unsigned int start; 2274 2275 stats = per_cpu_ptr(pstats, cpu); 2276 do { 2277 start = u64_stats_fetch_begin_irq(&stats->syncp); 2278 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2279 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2280 2281 sum.OutPktsProtected += tmp.OutPktsProtected; 2282 sum.OutPktsEncrypted += tmp.OutPktsEncrypted; 2283 sum.OutOctetsProtected += tmp.OutOctetsProtected; 2284 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2285 } 2286 2287 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2288 sum.OutPktsProtected, 2289 MACSEC_TXSC_STATS_ATTR_PAD) || 2290 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2291 sum.OutPktsEncrypted, 2292 MACSEC_TXSC_STATS_ATTR_PAD) || 2293 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2294 sum.OutOctetsProtected, 2295 MACSEC_TXSC_STATS_ATTR_PAD) || 2296 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2297 sum.OutOctetsEncrypted, 2298 MACSEC_TXSC_STATS_ATTR_PAD)) 2299 return -EMSGSIZE; 2300 2301 return 0; 2302 } 2303 2304 static int copy_secy_stats(struct sk_buff *skb, 2305 struct pcpu_secy_stats __percpu *pstats) 2306 { 2307 struct macsec_dev_stats sum = {0, }; 2308 int cpu; 2309 2310 for_each_possible_cpu(cpu) { 2311 const struct pcpu_secy_stats *stats; 2312 struct macsec_dev_stats tmp; 2313 unsigned int start; 2314 2315 stats = per_cpu_ptr(pstats, cpu); 2316 do { 2317 start = u64_stats_fetch_begin_irq(&stats->syncp); 2318 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2319 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2320 2321 sum.OutPktsUntagged += tmp.OutPktsUntagged; 2322 sum.InPktsUntagged += tmp.InPktsUntagged; 2323 sum.OutPktsTooLong += tmp.OutPktsTooLong; 2324 sum.InPktsNoTag += tmp.InPktsNoTag; 2325 sum.InPktsBadTag += tmp.InPktsBadTag; 2326 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2327 sum.InPktsNoSCI += tmp.InPktsNoSCI; 2328 sum.InPktsOverrun += tmp.InPktsOverrun; 2329 } 2330 2331 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 2332 sum.OutPktsUntagged, 2333 MACSEC_SECY_STATS_ATTR_PAD) || 2334 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 2335 sum.InPktsUntagged, 2336 MACSEC_SECY_STATS_ATTR_PAD) || 2337 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 2338 sum.OutPktsTooLong, 2339 MACSEC_SECY_STATS_ATTR_PAD) || 2340 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 2341 sum.InPktsNoTag, 2342 MACSEC_SECY_STATS_ATTR_PAD) || 2343 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 2344 sum.InPktsBadTag, 2345 MACSEC_SECY_STATS_ATTR_PAD) || 2346 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 2347 sum.InPktsUnknownSCI, 2348 MACSEC_SECY_STATS_ATTR_PAD) || 2349 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 2350 sum.InPktsNoSCI, 2351 MACSEC_SECY_STATS_ATTR_PAD) || 2352 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 2353 sum.InPktsOverrun, 2354 MACSEC_SECY_STATS_ATTR_PAD)) 2355 return -EMSGSIZE; 2356 2357 return 0; 2358 } 2359 2360 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 2361 { 2362 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2363 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY); 2364 2365 if (!secy_nest) 2366 return 1; 2367 2368 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 2369 MACSEC_SECY_ATTR_PAD) || 2370 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 2371 MACSEC_DEFAULT_CIPHER_ID, 2372 MACSEC_SECY_ATTR_PAD) || 2373 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 2374 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 2375 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 2376 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 2377 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 2378 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 2379 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 2380 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 2381 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 2382 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 2383 goto cancel; 2384 2385 if (secy->replay_protect) { 2386 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 2387 goto cancel; 2388 } 2389 2390 nla_nest_end(skb, secy_nest); 2391 return 0; 2392 2393 cancel: 2394 nla_nest_cancel(skb, secy_nest); 2395 return 1; 2396 } 2397 2398 static int dump_secy(struct macsec_secy *secy, struct net_device *dev, 2399 struct sk_buff *skb, struct netlink_callback *cb) 2400 { 2401 struct macsec_rx_sc *rx_sc; 2402 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2403 struct nlattr *txsa_list, *rxsc_list; 2404 int i, j; 2405 void *hdr; 2406 struct nlattr *attr; 2407 2408 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 2409 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 2410 if (!hdr) 2411 return -EMSGSIZE; 2412 2413 genl_dump_check_consistent(cb, hdr, &macsec_fam); 2414 2415 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 2416 goto nla_put_failure; 2417 2418 if (nla_put_secy(secy, skb)) 2419 goto nla_put_failure; 2420 2421 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS); 2422 if (!attr) 2423 goto nla_put_failure; 2424 if (copy_tx_sc_stats(skb, tx_sc->stats)) { 2425 nla_nest_cancel(skb, attr); 2426 goto nla_put_failure; 2427 } 2428 nla_nest_end(skb, attr); 2429 2430 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS); 2431 if (!attr) 2432 goto nla_put_failure; 2433 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) { 2434 nla_nest_cancel(skb, attr); 2435 goto nla_put_failure; 2436 } 2437 nla_nest_end(skb, attr); 2438 2439 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST); 2440 if (!txsa_list) 2441 goto nla_put_failure; 2442 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 2443 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 2444 struct nlattr *txsa_nest; 2445 2446 if (!tx_sa) 2447 continue; 2448 2449 txsa_nest = nla_nest_start(skb, j++); 2450 if (!txsa_nest) { 2451 nla_nest_cancel(skb, txsa_list); 2452 goto nla_put_failure; 2453 } 2454 2455 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2456 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) || 2457 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 2458 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 2459 nla_nest_cancel(skb, txsa_nest); 2460 nla_nest_cancel(skb, txsa_list); 2461 goto nla_put_failure; 2462 } 2463 2464 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS); 2465 if (!attr) { 2466 nla_nest_cancel(skb, txsa_nest); 2467 nla_nest_cancel(skb, txsa_list); 2468 goto nla_put_failure; 2469 } 2470 if (copy_tx_sa_stats(skb, tx_sa->stats)) { 2471 nla_nest_cancel(skb, attr); 2472 nla_nest_cancel(skb, txsa_nest); 2473 nla_nest_cancel(skb, txsa_list); 2474 goto nla_put_failure; 2475 } 2476 nla_nest_end(skb, attr); 2477 2478 nla_nest_end(skb, txsa_nest); 2479 } 2480 nla_nest_end(skb, txsa_list); 2481 2482 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST); 2483 if (!rxsc_list) 2484 goto nla_put_failure; 2485 2486 j = 1; 2487 for_each_rxsc_rtnl(secy, rx_sc) { 2488 int k; 2489 struct nlattr *rxsa_list; 2490 struct nlattr *rxsc_nest = nla_nest_start(skb, j++); 2491 2492 if (!rxsc_nest) { 2493 nla_nest_cancel(skb, rxsc_list); 2494 goto nla_put_failure; 2495 } 2496 2497 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 2498 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 2499 MACSEC_RXSC_ATTR_PAD)) { 2500 nla_nest_cancel(skb, rxsc_nest); 2501 nla_nest_cancel(skb, rxsc_list); 2502 goto nla_put_failure; 2503 } 2504 2505 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS); 2506 if (!attr) { 2507 nla_nest_cancel(skb, rxsc_nest); 2508 nla_nest_cancel(skb, rxsc_list); 2509 goto nla_put_failure; 2510 } 2511 if (copy_rx_sc_stats(skb, rx_sc->stats)) { 2512 nla_nest_cancel(skb, attr); 2513 nla_nest_cancel(skb, rxsc_nest); 2514 nla_nest_cancel(skb, rxsc_list); 2515 goto nla_put_failure; 2516 } 2517 nla_nest_end(skb, attr); 2518 2519 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST); 2520 if (!rxsa_list) { 2521 nla_nest_cancel(skb, rxsc_nest); 2522 nla_nest_cancel(skb, rxsc_list); 2523 goto nla_put_failure; 2524 } 2525 2526 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 2527 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 2528 struct nlattr *rxsa_nest; 2529 2530 if (!rx_sa) 2531 continue; 2532 2533 rxsa_nest = nla_nest_start(skb, k++); 2534 if (!rxsa_nest) { 2535 nla_nest_cancel(skb, rxsa_list); 2536 nla_nest_cancel(skb, rxsc_nest); 2537 nla_nest_cancel(skb, rxsc_list); 2538 goto nla_put_failure; 2539 } 2540 2541 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS); 2542 if (!attr) { 2543 nla_nest_cancel(skb, rxsa_list); 2544 nla_nest_cancel(skb, rxsc_nest); 2545 nla_nest_cancel(skb, rxsc_list); 2546 goto nla_put_failure; 2547 } 2548 if (copy_rx_sa_stats(skb, rx_sa->stats)) { 2549 nla_nest_cancel(skb, attr); 2550 nla_nest_cancel(skb, rxsa_list); 2551 nla_nest_cancel(skb, rxsc_nest); 2552 nla_nest_cancel(skb, rxsc_list); 2553 goto nla_put_failure; 2554 } 2555 nla_nest_end(skb, attr); 2556 2557 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2558 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) || 2559 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 2560 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 2561 nla_nest_cancel(skb, rxsa_nest); 2562 nla_nest_cancel(skb, rxsc_nest); 2563 nla_nest_cancel(skb, rxsc_list); 2564 goto nla_put_failure; 2565 } 2566 nla_nest_end(skb, rxsa_nest); 2567 } 2568 2569 nla_nest_end(skb, rxsa_list); 2570 nla_nest_end(skb, rxsc_nest); 2571 } 2572 2573 nla_nest_end(skb, rxsc_list); 2574 2575 genlmsg_end(skb, hdr); 2576 2577 return 0; 2578 2579 nla_put_failure: 2580 genlmsg_cancel(skb, hdr); 2581 return -EMSGSIZE; 2582 } 2583 2584 static int macsec_generation = 1; /* protected by RTNL */ 2585 2586 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 2587 { 2588 struct net *net = sock_net(skb->sk); 2589 struct net_device *dev; 2590 int dev_idx, d; 2591 2592 dev_idx = cb->args[0]; 2593 2594 d = 0; 2595 rtnl_lock(); 2596 2597 cb->seq = macsec_generation; 2598 2599 for_each_netdev(net, dev) { 2600 struct macsec_secy *secy; 2601 2602 if (d < dev_idx) 2603 goto next; 2604 2605 if (!netif_is_macsec(dev)) 2606 goto next; 2607 2608 secy = &macsec_priv(dev)->secy; 2609 if (dump_secy(secy, dev, skb, cb) < 0) 2610 goto done; 2611 next: 2612 d++; 2613 } 2614 2615 done: 2616 rtnl_unlock(); 2617 cb->args[0] = d; 2618 return skb->len; 2619 } 2620 2621 static const struct genl_ops macsec_genl_ops[] = { 2622 { 2623 .cmd = MACSEC_CMD_GET_TXSC, 2624 .dumpit = macsec_dump_txsc, 2625 .policy = macsec_genl_policy, 2626 }, 2627 { 2628 .cmd = MACSEC_CMD_ADD_RXSC, 2629 .doit = macsec_add_rxsc, 2630 .policy = macsec_genl_policy, 2631 .flags = GENL_ADMIN_PERM, 2632 }, 2633 { 2634 .cmd = MACSEC_CMD_DEL_RXSC, 2635 .doit = macsec_del_rxsc, 2636 .policy = macsec_genl_policy, 2637 .flags = GENL_ADMIN_PERM, 2638 }, 2639 { 2640 .cmd = MACSEC_CMD_UPD_RXSC, 2641 .doit = macsec_upd_rxsc, 2642 .policy = macsec_genl_policy, 2643 .flags = GENL_ADMIN_PERM, 2644 }, 2645 { 2646 .cmd = MACSEC_CMD_ADD_TXSA, 2647 .doit = macsec_add_txsa, 2648 .policy = macsec_genl_policy, 2649 .flags = GENL_ADMIN_PERM, 2650 }, 2651 { 2652 .cmd = MACSEC_CMD_DEL_TXSA, 2653 .doit = macsec_del_txsa, 2654 .policy = macsec_genl_policy, 2655 .flags = GENL_ADMIN_PERM, 2656 }, 2657 { 2658 .cmd = MACSEC_CMD_UPD_TXSA, 2659 .doit = macsec_upd_txsa, 2660 .policy = macsec_genl_policy, 2661 .flags = GENL_ADMIN_PERM, 2662 }, 2663 { 2664 .cmd = MACSEC_CMD_ADD_RXSA, 2665 .doit = macsec_add_rxsa, 2666 .policy = macsec_genl_policy, 2667 .flags = GENL_ADMIN_PERM, 2668 }, 2669 { 2670 .cmd = MACSEC_CMD_DEL_RXSA, 2671 .doit = macsec_del_rxsa, 2672 .policy = macsec_genl_policy, 2673 .flags = GENL_ADMIN_PERM, 2674 }, 2675 { 2676 .cmd = MACSEC_CMD_UPD_RXSA, 2677 .doit = macsec_upd_rxsa, 2678 .policy = macsec_genl_policy, 2679 .flags = GENL_ADMIN_PERM, 2680 }, 2681 }; 2682 2683 static struct genl_family macsec_fam __ro_after_init = { 2684 .name = MACSEC_GENL_NAME, 2685 .hdrsize = 0, 2686 .version = MACSEC_GENL_VERSION, 2687 .maxattr = MACSEC_ATTR_MAX, 2688 .netnsok = true, 2689 .module = THIS_MODULE, 2690 .ops = macsec_genl_ops, 2691 .n_ops = ARRAY_SIZE(macsec_genl_ops), 2692 }; 2693 2694 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 2695 struct net_device *dev) 2696 { 2697 struct macsec_dev *macsec = netdev_priv(dev); 2698 struct macsec_secy *secy = &macsec->secy; 2699 struct pcpu_secy_stats *secy_stats; 2700 int ret, len; 2701 2702 /* 10.5 */ 2703 if (!secy->protect_frames) { 2704 secy_stats = this_cpu_ptr(macsec->stats); 2705 u64_stats_update_begin(&secy_stats->syncp); 2706 secy_stats->stats.OutPktsUntagged++; 2707 u64_stats_update_end(&secy_stats->syncp); 2708 skb->dev = macsec->real_dev; 2709 len = skb->len; 2710 ret = dev_queue_xmit(skb); 2711 count_tx(dev, ret, len); 2712 return ret; 2713 } 2714 2715 if (!secy->operational) { 2716 kfree_skb(skb); 2717 dev->stats.tx_dropped++; 2718 return NETDEV_TX_OK; 2719 } 2720 2721 skb = macsec_encrypt(skb, dev); 2722 if (IS_ERR(skb)) { 2723 if (PTR_ERR(skb) != -EINPROGRESS) 2724 dev->stats.tx_dropped++; 2725 return NETDEV_TX_OK; 2726 } 2727 2728 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 2729 2730 macsec_encrypt_finish(skb, dev); 2731 len = skb->len; 2732 ret = dev_queue_xmit(skb); 2733 count_tx(dev, ret, len); 2734 return ret; 2735 } 2736 2737 #define MACSEC_FEATURES \ 2738 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 2739 static struct lock_class_key macsec_netdev_addr_lock_key; 2740 2741 static int macsec_dev_init(struct net_device *dev) 2742 { 2743 struct macsec_dev *macsec = macsec_priv(dev); 2744 struct net_device *real_dev = macsec->real_dev; 2745 int err; 2746 2747 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2748 if (!dev->tstats) 2749 return -ENOMEM; 2750 2751 err = gro_cells_init(&macsec->gro_cells, dev); 2752 if (err) { 2753 free_percpu(dev->tstats); 2754 return err; 2755 } 2756 2757 dev->features = real_dev->features & MACSEC_FEATURES; 2758 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 2759 2760 dev->needed_headroom = real_dev->needed_headroom + 2761 MACSEC_NEEDED_HEADROOM; 2762 dev->needed_tailroom = real_dev->needed_tailroom + 2763 MACSEC_NEEDED_TAILROOM; 2764 2765 if (is_zero_ether_addr(dev->dev_addr)) 2766 eth_hw_addr_inherit(dev, real_dev); 2767 if (is_zero_ether_addr(dev->broadcast)) 2768 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 2769 2770 return 0; 2771 } 2772 2773 static void macsec_dev_uninit(struct net_device *dev) 2774 { 2775 struct macsec_dev *macsec = macsec_priv(dev); 2776 2777 gro_cells_destroy(&macsec->gro_cells); 2778 free_percpu(dev->tstats); 2779 } 2780 2781 static netdev_features_t macsec_fix_features(struct net_device *dev, 2782 netdev_features_t features) 2783 { 2784 struct macsec_dev *macsec = macsec_priv(dev); 2785 struct net_device *real_dev = macsec->real_dev; 2786 2787 features &= (real_dev->features & MACSEC_FEATURES) | 2788 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 2789 features |= NETIF_F_LLTX; 2790 2791 return features; 2792 } 2793 2794 static int macsec_dev_open(struct net_device *dev) 2795 { 2796 struct macsec_dev *macsec = macsec_priv(dev); 2797 struct net_device *real_dev = macsec->real_dev; 2798 int err; 2799 2800 if (!(real_dev->flags & IFF_UP)) 2801 return -ENETDOWN; 2802 2803 err = dev_uc_add(real_dev, dev->dev_addr); 2804 if (err < 0) 2805 return err; 2806 2807 if (dev->flags & IFF_ALLMULTI) { 2808 err = dev_set_allmulti(real_dev, 1); 2809 if (err < 0) 2810 goto del_unicast; 2811 } 2812 2813 if (dev->flags & IFF_PROMISC) { 2814 err = dev_set_promiscuity(real_dev, 1); 2815 if (err < 0) 2816 goto clear_allmulti; 2817 } 2818 2819 if (netif_carrier_ok(real_dev)) 2820 netif_carrier_on(dev); 2821 2822 return 0; 2823 clear_allmulti: 2824 if (dev->flags & IFF_ALLMULTI) 2825 dev_set_allmulti(real_dev, -1); 2826 del_unicast: 2827 dev_uc_del(real_dev, dev->dev_addr); 2828 netif_carrier_off(dev); 2829 return err; 2830 } 2831 2832 static int macsec_dev_stop(struct net_device *dev) 2833 { 2834 struct macsec_dev *macsec = macsec_priv(dev); 2835 struct net_device *real_dev = macsec->real_dev; 2836 2837 netif_carrier_off(dev); 2838 2839 dev_mc_unsync(real_dev, dev); 2840 dev_uc_unsync(real_dev, dev); 2841 2842 if (dev->flags & IFF_ALLMULTI) 2843 dev_set_allmulti(real_dev, -1); 2844 2845 if (dev->flags & IFF_PROMISC) 2846 dev_set_promiscuity(real_dev, -1); 2847 2848 dev_uc_del(real_dev, dev->dev_addr); 2849 2850 return 0; 2851 } 2852 2853 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 2854 { 2855 struct net_device *real_dev = macsec_priv(dev)->real_dev; 2856 2857 if (!(dev->flags & IFF_UP)) 2858 return; 2859 2860 if (change & IFF_ALLMULTI) 2861 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 2862 2863 if (change & IFF_PROMISC) 2864 dev_set_promiscuity(real_dev, 2865 dev->flags & IFF_PROMISC ? 1 : -1); 2866 } 2867 2868 static void macsec_dev_set_rx_mode(struct net_device *dev) 2869 { 2870 struct net_device *real_dev = macsec_priv(dev)->real_dev; 2871 2872 dev_mc_sync(real_dev, dev); 2873 dev_uc_sync(real_dev, dev); 2874 } 2875 2876 static int macsec_set_mac_address(struct net_device *dev, void *p) 2877 { 2878 struct macsec_dev *macsec = macsec_priv(dev); 2879 struct net_device *real_dev = macsec->real_dev; 2880 struct sockaddr *addr = p; 2881 int err; 2882 2883 if (!is_valid_ether_addr(addr->sa_data)) 2884 return -EADDRNOTAVAIL; 2885 2886 if (!(dev->flags & IFF_UP)) 2887 goto out; 2888 2889 err = dev_uc_add(real_dev, addr->sa_data); 2890 if (err < 0) 2891 return err; 2892 2893 dev_uc_del(real_dev, dev->dev_addr); 2894 2895 out: 2896 ether_addr_copy(dev->dev_addr, addr->sa_data); 2897 return 0; 2898 } 2899 2900 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 2901 { 2902 struct macsec_dev *macsec = macsec_priv(dev); 2903 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 2904 2905 if (macsec->real_dev->mtu - extra < new_mtu) 2906 return -ERANGE; 2907 2908 dev->mtu = new_mtu; 2909 2910 return 0; 2911 } 2912 2913 static void macsec_get_stats64(struct net_device *dev, 2914 struct rtnl_link_stats64 *s) 2915 { 2916 int cpu; 2917 2918 if (!dev->tstats) 2919 return; 2920 2921 for_each_possible_cpu(cpu) { 2922 struct pcpu_sw_netstats *stats; 2923 struct pcpu_sw_netstats tmp; 2924 int start; 2925 2926 stats = per_cpu_ptr(dev->tstats, cpu); 2927 do { 2928 start = u64_stats_fetch_begin_irq(&stats->syncp); 2929 tmp.rx_packets = stats->rx_packets; 2930 tmp.rx_bytes = stats->rx_bytes; 2931 tmp.tx_packets = stats->tx_packets; 2932 tmp.tx_bytes = stats->tx_bytes; 2933 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2934 2935 s->rx_packets += tmp.rx_packets; 2936 s->rx_bytes += tmp.rx_bytes; 2937 s->tx_packets += tmp.tx_packets; 2938 s->tx_bytes += tmp.tx_bytes; 2939 } 2940 2941 s->rx_dropped = dev->stats.rx_dropped; 2942 s->tx_dropped = dev->stats.tx_dropped; 2943 } 2944 2945 static int macsec_get_iflink(const struct net_device *dev) 2946 { 2947 return macsec_priv(dev)->real_dev->ifindex; 2948 } 2949 2950 2951 static int macsec_get_nest_level(struct net_device *dev) 2952 { 2953 return macsec_priv(dev)->nest_level; 2954 } 2955 2956 2957 static const struct net_device_ops macsec_netdev_ops = { 2958 .ndo_init = macsec_dev_init, 2959 .ndo_uninit = macsec_dev_uninit, 2960 .ndo_open = macsec_dev_open, 2961 .ndo_stop = macsec_dev_stop, 2962 .ndo_fix_features = macsec_fix_features, 2963 .ndo_change_mtu = macsec_change_mtu, 2964 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 2965 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 2966 .ndo_set_mac_address = macsec_set_mac_address, 2967 .ndo_start_xmit = macsec_start_xmit, 2968 .ndo_get_stats64 = macsec_get_stats64, 2969 .ndo_get_iflink = macsec_get_iflink, 2970 .ndo_get_lock_subclass = macsec_get_nest_level, 2971 }; 2972 2973 static const struct device_type macsec_type = { 2974 .name = "macsec", 2975 }; 2976 2977 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 2978 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 2979 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 2980 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 2981 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 2982 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 2983 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 2984 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 2985 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 2986 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 2987 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 2988 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 2989 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 2990 }; 2991 2992 static void macsec_free_netdev(struct net_device *dev) 2993 { 2994 struct macsec_dev *macsec = macsec_priv(dev); 2995 struct net_device *real_dev = macsec->real_dev; 2996 2997 free_percpu(macsec->stats); 2998 free_percpu(macsec->secy.tx_sc.stats); 2999 3000 dev_put(real_dev); 3001 } 3002 3003 static void macsec_setup(struct net_device *dev) 3004 { 3005 ether_setup(dev); 3006 dev->min_mtu = 0; 3007 dev->max_mtu = ETH_MAX_MTU; 3008 dev->priv_flags |= IFF_NO_QUEUE; 3009 dev->netdev_ops = &macsec_netdev_ops; 3010 dev->needs_free_netdev = true; 3011 dev->priv_destructor = macsec_free_netdev; 3012 SET_NETDEV_DEVTYPE(dev, &macsec_type); 3013 3014 eth_zero_addr(dev->broadcast); 3015 } 3016 3017 static void macsec_changelink_common(struct net_device *dev, 3018 struct nlattr *data[]) 3019 { 3020 struct macsec_secy *secy; 3021 struct macsec_tx_sc *tx_sc; 3022 3023 secy = &macsec_priv(dev)->secy; 3024 tx_sc = &secy->tx_sc; 3025 3026 if (data[IFLA_MACSEC_ENCODING_SA]) { 3027 struct macsec_tx_sa *tx_sa; 3028 3029 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3030 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 3031 3032 secy->operational = tx_sa && tx_sa->active; 3033 } 3034 3035 if (data[IFLA_MACSEC_WINDOW]) 3036 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3037 3038 if (data[IFLA_MACSEC_ENCRYPT]) 3039 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3040 3041 if (data[IFLA_MACSEC_PROTECT]) 3042 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3043 3044 if (data[IFLA_MACSEC_INC_SCI]) 3045 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3046 3047 if (data[IFLA_MACSEC_ES]) 3048 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3049 3050 if (data[IFLA_MACSEC_SCB]) 3051 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3052 3053 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3054 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3055 3056 if (data[IFLA_MACSEC_VALIDATION]) 3057 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3058 } 3059 3060 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3061 struct nlattr *data[], 3062 struct netlink_ext_ack *extack) 3063 { 3064 if (!data) 3065 return 0; 3066 3067 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3068 data[IFLA_MACSEC_ICV_LEN] || 3069 data[IFLA_MACSEC_SCI] || 3070 data[IFLA_MACSEC_PORT]) 3071 return -EINVAL; 3072 3073 macsec_changelink_common(dev, data); 3074 3075 return 0; 3076 } 3077 3078 static void macsec_del_dev(struct macsec_dev *macsec) 3079 { 3080 int i; 3081 3082 while (macsec->secy.rx_sc) { 3083 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 3084 3085 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 3086 free_rx_sc(rx_sc); 3087 } 3088 3089 for (i = 0; i < MACSEC_NUM_AN; i++) { 3090 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 3091 3092 if (sa) { 3093 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 3094 clear_tx_sa(sa); 3095 } 3096 } 3097 } 3098 3099 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 3100 { 3101 struct macsec_dev *macsec = macsec_priv(dev); 3102 struct net_device *real_dev = macsec->real_dev; 3103 3104 unregister_netdevice_queue(dev, head); 3105 list_del_rcu(&macsec->secys); 3106 macsec_del_dev(macsec); 3107 netdev_upper_dev_unlink(real_dev, dev); 3108 3109 macsec_generation++; 3110 } 3111 3112 static void macsec_dellink(struct net_device *dev, struct list_head *head) 3113 { 3114 struct macsec_dev *macsec = macsec_priv(dev); 3115 struct net_device *real_dev = macsec->real_dev; 3116 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3117 3118 macsec_common_dellink(dev, head); 3119 3120 if (list_empty(&rxd->secys)) { 3121 netdev_rx_handler_unregister(real_dev); 3122 kfree(rxd); 3123 } 3124 } 3125 3126 static int register_macsec_dev(struct net_device *real_dev, 3127 struct net_device *dev) 3128 { 3129 struct macsec_dev *macsec = macsec_priv(dev); 3130 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3131 3132 if (!rxd) { 3133 int err; 3134 3135 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 3136 if (!rxd) 3137 return -ENOMEM; 3138 3139 INIT_LIST_HEAD(&rxd->secys); 3140 3141 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 3142 rxd); 3143 if (err < 0) { 3144 kfree(rxd); 3145 return err; 3146 } 3147 } 3148 3149 list_add_tail_rcu(&macsec->secys, &rxd->secys); 3150 return 0; 3151 } 3152 3153 static bool sci_exists(struct net_device *dev, sci_t sci) 3154 { 3155 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 3156 struct macsec_dev *macsec; 3157 3158 list_for_each_entry(macsec, &rxd->secys, secys) { 3159 if (macsec->secy.sci == sci) 3160 return true; 3161 } 3162 3163 return false; 3164 } 3165 3166 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 3167 { 3168 return make_sci(dev->dev_addr, port); 3169 } 3170 3171 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 3172 { 3173 struct macsec_dev *macsec = macsec_priv(dev); 3174 struct macsec_secy *secy = &macsec->secy; 3175 3176 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 3177 if (!macsec->stats) 3178 return -ENOMEM; 3179 3180 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 3181 if (!secy->tx_sc.stats) { 3182 free_percpu(macsec->stats); 3183 return -ENOMEM; 3184 } 3185 3186 if (sci == MACSEC_UNDEF_SCI) 3187 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3188 3189 secy->netdev = dev; 3190 secy->operational = true; 3191 secy->key_len = DEFAULT_SAK_LEN; 3192 secy->icv_len = icv_len; 3193 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 3194 secy->protect_frames = true; 3195 secy->replay_protect = false; 3196 3197 secy->sci = sci; 3198 secy->tx_sc.active = true; 3199 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 3200 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 3201 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 3202 secy->tx_sc.end_station = false; 3203 secy->tx_sc.scb = false; 3204 3205 return 0; 3206 } 3207 3208 static int macsec_newlink(struct net *net, struct net_device *dev, 3209 struct nlattr *tb[], struct nlattr *data[], 3210 struct netlink_ext_ack *extack) 3211 { 3212 struct macsec_dev *macsec = macsec_priv(dev); 3213 struct net_device *real_dev; 3214 int err; 3215 sci_t sci; 3216 u8 icv_len = DEFAULT_ICV_LEN; 3217 rx_handler_func_t *rx_handler; 3218 3219 if (!tb[IFLA_LINK]) 3220 return -EINVAL; 3221 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 3222 if (!real_dev) 3223 return -ENODEV; 3224 3225 dev->priv_flags |= IFF_MACSEC; 3226 3227 macsec->real_dev = real_dev; 3228 3229 if (data && data[IFLA_MACSEC_ICV_LEN]) 3230 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3231 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 3232 3233 rx_handler = rtnl_dereference(real_dev->rx_handler); 3234 if (rx_handler && rx_handler != macsec_handle_frame) 3235 return -EBUSY; 3236 3237 err = register_netdevice(dev); 3238 if (err < 0) 3239 return err; 3240 3241 dev_hold(real_dev); 3242 3243 macsec->nest_level = dev_get_nest_level(real_dev) + 1; 3244 netdev_lockdep_set_classes(dev); 3245 lockdep_set_class_and_subclass(&dev->addr_list_lock, 3246 &macsec_netdev_addr_lock_key, 3247 macsec_get_nest_level(dev)); 3248 3249 err = netdev_upper_dev_link(real_dev, dev); 3250 if (err < 0) 3251 goto unregister; 3252 3253 /* need to be already registered so that ->init has run and 3254 * the MAC addr is set 3255 */ 3256 if (data && data[IFLA_MACSEC_SCI]) 3257 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 3258 else if (data && data[IFLA_MACSEC_PORT]) 3259 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 3260 else 3261 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3262 3263 if (rx_handler && sci_exists(real_dev, sci)) { 3264 err = -EBUSY; 3265 goto unlink; 3266 } 3267 3268 err = macsec_add_dev(dev, sci, icv_len); 3269 if (err) 3270 goto unlink; 3271 3272 if (data) 3273 macsec_changelink_common(dev, data); 3274 3275 err = register_macsec_dev(real_dev, dev); 3276 if (err < 0) 3277 goto del_dev; 3278 3279 macsec_generation++; 3280 3281 return 0; 3282 3283 del_dev: 3284 macsec_del_dev(macsec); 3285 unlink: 3286 netdev_upper_dev_unlink(real_dev, dev); 3287 unregister: 3288 unregister_netdevice(dev); 3289 return err; 3290 } 3291 3292 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], 3293 struct netlink_ext_ack *extack) 3294 { 3295 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 3296 u8 icv_len = DEFAULT_ICV_LEN; 3297 int flag; 3298 bool es, scb, sci; 3299 3300 if (!data) 3301 return 0; 3302 3303 if (data[IFLA_MACSEC_CIPHER_SUITE]) 3304 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 3305 3306 if (data[IFLA_MACSEC_ICV_LEN]) { 3307 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3308 if (icv_len != DEFAULT_ICV_LEN) { 3309 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 3310 struct crypto_aead *dummy_tfm; 3311 3312 dummy_tfm = macsec_alloc_tfm(dummy_key, 3313 DEFAULT_SAK_LEN, 3314 icv_len); 3315 if (IS_ERR(dummy_tfm)) 3316 return PTR_ERR(dummy_tfm); 3317 crypto_free_aead(dummy_tfm); 3318 } 3319 } 3320 3321 switch (csid) { 3322 case MACSEC_DEFAULT_CIPHER_ID: 3323 case MACSEC_DEFAULT_CIPHER_ALT: 3324 if (icv_len < MACSEC_MIN_ICV_LEN || 3325 icv_len > MACSEC_STD_ICV_LEN) 3326 return -EINVAL; 3327 break; 3328 default: 3329 return -EINVAL; 3330 } 3331 3332 if (data[IFLA_MACSEC_ENCODING_SA]) { 3333 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 3334 return -EINVAL; 3335 } 3336 3337 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 3338 flag < IFLA_MACSEC_VALIDATION; 3339 flag++) { 3340 if (data[flag]) { 3341 if (nla_get_u8(data[flag]) > 1) 3342 return -EINVAL; 3343 } 3344 } 3345 3346 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 3347 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 3348 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 3349 3350 if ((sci && (scb || es)) || (scb && es)) 3351 return -EINVAL; 3352 3353 if (data[IFLA_MACSEC_VALIDATION] && 3354 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 3355 return -EINVAL; 3356 3357 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 3358 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 3359 !data[IFLA_MACSEC_WINDOW]) 3360 return -EINVAL; 3361 3362 return 0; 3363 } 3364 3365 static struct net *macsec_get_link_net(const struct net_device *dev) 3366 { 3367 return dev_net(macsec_priv(dev)->real_dev); 3368 } 3369 3370 static size_t macsec_get_size(const struct net_device *dev) 3371 { 3372 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ 3373 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ 3374 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ 3375 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ 3376 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ 3377 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ 3378 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ 3379 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ 3380 nla_total_size(1) + /* IFLA_MACSEC_ES */ 3381 nla_total_size(1) + /* IFLA_MACSEC_SCB */ 3382 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ 3383 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ 3384 0; 3385 } 3386 3387 static int macsec_fill_info(struct sk_buff *skb, 3388 const struct net_device *dev) 3389 { 3390 struct macsec_secy *secy = &macsec_priv(dev)->secy; 3391 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3392 3393 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 3394 IFLA_MACSEC_PAD) || 3395 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 3396 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 3397 MACSEC_DEFAULT_CIPHER_ID, IFLA_MACSEC_PAD) || 3398 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 3399 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 3400 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 3401 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 3402 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 3403 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 3404 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 3405 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 3406 0) 3407 goto nla_put_failure; 3408 3409 if (secy->replay_protect) { 3410 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 3411 goto nla_put_failure; 3412 } 3413 3414 return 0; 3415 3416 nla_put_failure: 3417 return -EMSGSIZE; 3418 } 3419 3420 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 3421 .kind = "macsec", 3422 .priv_size = sizeof(struct macsec_dev), 3423 .maxtype = IFLA_MACSEC_MAX, 3424 .policy = macsec_rtnl_policy, 3425 .setup = macsec_setup, 3426 .validate = macsec_validate_attr, 3427 .newlink = macsec_newlink, 3428 .changelink = macsec_changelink, 3429 .dellink = macsec_dellink, 3430 .get_size = macsec_get_size, 3431 .fill_info = macsec_fill_info, 3432 .get_link_net = macsec_get_link_net, 3433 }; 3434 3435 static bool is_macsec_master(struct net_device *dev) 3436 { 3437 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 3438 } 3439 3440 static int macsec_notify(struct notifier_block *this, unsigned long event, 3441 void *ptr) 3442 { 3443 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 3444 LIST_HEAD(head); 3445 3446 if (!is_macsec_master(real_dev)) 3447 return NOTIFY_DONE; 3448 3449 switch (event) { 3450 case NETDEV_UNREGISTER: { 3451 struct macsec_dev *m, *n; 3452 struct macsec_rxh_data *rxd; 3453 3454 rxd = macsec_data_rtnl(real_dev); 3455 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 3456 macsec_common_dellink(m->secy.netdev, &head); 3457 } 3458 3459 netdev_rx_handler_unregister(real_dev); 3460 kfree(rxd); 3461 3462 unregister_netdevice_many(&head); 3463 break; 3464 } 3465 case NETDEV_CHANGEMTU: { 3466 struct macsec_dev *m; 3467 struct macsec_rxh_data *rxd; 3468 3469 rxd = macsec_data_rtnl(real_dev); 3470 list_for_each_entry(m, &rxd->secys, secys) { 3471 struct net_device *dev = m->secy.netdev; 3472 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 3473 macsec_extra_len(true)); 3474 3475 if (dev->mtu > mtu) 3476 dev_set_mtu(dev, mtu); 3477 } 3478 } 3479 } 3480 3481 return NOTIFY_OK; 3482 } 3483 3484 static struct notifier_block macsec_notifier = { 3485 .notifier_call = macsec_notify, 3486 }; 3487 3488 static int __init macsec_init(void) 3489 { 3490 int err; 3491 3492 pr_info("MACsec IEEE 802.1AE\n"); 3493 err = register_netdevice_notifier(&macsec_notifier); 3494 if (err) 3495 return err; 3496 3497 err = rtnl_link_register(&macsec_link_ops); 3498 if (err) 3499 goto notifier; 3500 3501 err = genl_register_family(&macsec_fam); 3502 if (err) 3503 goto rtnl; 3504 3505 return 0; 3506 3507 rtnl: 3508 rtnl_link_unregister(&macsec_link_ops); 3509 notifier: 3510 unregister_netdevice_notifier(&macsec_notifier); 3511 return err; 3512 } 3513 3514 static void __exit macsec_exit(void) 3515 { 3516 genl_unregister_family(&macsec_fam); 3517 rtnl_link_unregister(&macsec_link_ops); 3518 unregister_netdevice_notifier(&macsec_notifier); 3519 rcu_barrier(); 3520 } 3521 3522 module_init(macsec_init); 3523 module_exit(macsec_exit); 3524 3525 MODULE_ALIAS_RTNL_LINK("macsec"); 3526 MODULE_ALIAS_GENL_FAMILY("macsec"); 3527 3528 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 3529 MODULE_LICENSE("GPL v2"); 3530