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