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 <linux/refcount.h> 20 #include <net/genetlink.h> 21 #include <net/sock.h> 22 #include <net/gro_cells.h> 23 24 #include <uapi/linux/if_macsec.h> 25 26 typedef u64 __bitwise sci_t; 27 28 #define MACSEC_SCI_LEN 8 29 30 /* SecTAG length = macsec_eth_header without the optional SCI */ 31 #define MACSEC_TAG_LEN 6 32 33 struct macsec_eth_header { 34 struct ethhdr eth; 35 /* SecTAG */ 36 u8 tci_an; 37 #if defined(__LITTLE_ENDIAN_BITFIELD) 38 u8 short_length:6, 39 unused:2; 40 #elif defined(__BIG_ENDIAN_BITFIELD) 41 u8 unused:2, 42 short_length:6; 43 #else 44 #error "Please fix <asm/byteorder.h>" 45 #endif 46 __be32 packet_number; 47 u8 secure_channel_id[8]; /* optional */ 48 } __packed; 49 50 #define MACSEC_TCI_VERSION 0x80 51 #define MACSEC_TCI_ES 0x40 /* end station */ 52 #define MACSEC_TCI_SC 0x20 /* SCI present */ 53 #define MACSEC_TCI_SCB 0x10 /* epon */ 54 #define MACSEC_TCI_E 0x08 /* encryption */ 55 #define MACSEC_TCI_C 0x04 /* changed text */ 56 #define MACSEC_AN_MASK 0x03 /* association number */ 57 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C) 58 59 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */ 60 #define MIN_NON_SHORT_LEN 48 61 62 #define GCM_AES_IV_LEN 12 63 #define DEFAULT_ICV_LEN 16 64 65 #define MACSEC_NUM_AN 4 /* 2 bits for the association number */ 66 67 #define for_each_rxsc(secy, sc) \ 68 for (sc = rcu_dereference_bh(secy->rx_sc); \ 69 sc; \ 70 sc = rcu_dereference_bh(sc->next)) 71 #define for_each_rxsc_rtnl(secy, sc) \ 72 for (sc = rtnl_dereference(secy->rx_sc); \ 73 sc; \ 74 sc = rtnl_dereference(sc->next)) 75 76 struct gcm_iv { 77 union { 78 u8 secure_channel_id[8]; 79 sci_t sci; 80 }; 81 __be32 pn; 82 }; 83 84 /** 85 * struct macsec_key - SA key 86 * @id: user-provided key identifier 87 * @tfm: crypto struct, key storage 88 */ 89 struct macsec_key { 90 u8 id[MACSEC_KEYID_LEN]; 91 struct crypto_aead *tfm; 92 }; 93 94 struct macsec_rx_sc_stats { 95 __u64 InOctetsValidated; 96 __u64 InOctetsDecrypted; 97 __u64 InPktsUnchecked; 98 __u64 InPktsDelayed; 99 __u64 InPktsOK; 100 __u64 InPktsInvalid; 101 __u64 InPktsLate; 102 __u64 InPktsNotValid; 103 __u64 InPktsNotUsingSA; 104 __u64 InPktsUnusedSA; 105 }; 106 107 struct macsec_rx_sa_stats { 108 __u32 InPktsOK; 109 __u32 InPktsInvalid; 110 __u32 InPktsNotValid; 111 __u32 InPktsNotUsingSA; 112 __u32 InPktsUnusedSA; 113 }; 114 115 struct macsec_tx_sa_stats { 116 __u32 OutPktsProtected; 117 __u32 OutPktsEncrypted; 118 }; 119 120 struct macsec_tx_sc_stats { 121 __u64 OutPktsProtected; 122 __u64 OutPktsEncrypted; 123 __u64 OutOctetsProtected; 124 __u64 OutOctetsEncrypted; 125 }; 126 127 struct macsec_dev_stats { 128 __u64 OutPktsUntagged; 129 __u64 InPktsUntagged; 130 __u64 OutPktsTooLong; 131 __u64 InPktsNoTag; 132 __u64 InPktsBadTag; 133 __u64 InPktsUnknownSCI; 134 __u64 InPktsNoSCI; 135 __u64 InPktsOverrun; 136 }; 137 138 /** 139 * struct macsec_rx_sa - receive secure association 140 * @active: 141 * @next_pn: packet number expected for the next packet 142 * @lock: protects next_pn manipulations 143 * @key: key structure 144 * @stats: per-SA stats 145 */ 146 struct macsec_rx_sa { 147 struct macsec_key key; 148 spinlock_t lock; 149 u32 next_pn; 150 refcount_t refcnt; 151 bool active; 152 struct macsec_rx_sa_stats __percpu *stats; 153 struct macsec_rx_sc *sc; 154 struct rcu_head rcu; 155 }; 156 157 struct pcpu_rx_sc_stats { 158 struct macsec_rx_sc_stats stats; 159 struct u64_stats_sync syncp; 160 }; 161 162 /** 163 * struct macsec_rx_sc - receive secure channel 164 * @sci: secure channel identifier for this SC 165 * @active: channel is active 166 * @sa: array of secure associations 167 * @stats: per-SC stats 168 */ 169 struct macsec_rx_sc { 170 struct macsec_rx_sc __rcu *next; 171 sci_t sci; 172 bool active; 173 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN]; 174 struct pcpu_rx_sc_stats __percpu *stats; 175 refcount_t refcnt; 176 struct rcu_head rcu_head; 177 }; 178 179 /** 180 * struct macsec_tx_sa - transmit secure association 181 * @active: 182 * @next_pn: packet number to use for the next packet 183 * @lock: protects next_pn manipulations 184 * @key: key structure 185 * @stats: per-SA stats 186 */ 187 struct macsec_tx_sa { 188 struct macsec_key key; 189 spinlock_t lock; 190 u32 next_pn; 191 refcount_t refcnt; 192 bool active; 193 struct macsec_tx_sa_stats __percpu *stats; 194 struct rcu_head rcu; 195 }; 196 197 struct pcpu_tx_sc_stats { 198 struct macsec_tx_sc_stats stats; 199 struct u64_stats_sync syncp; 200 }; 201 202 /** 203 * struct macsec_tx_sc - transmit secure channel 204 * @active: 205 * @encoding_sa: association number of the SA currently in use 206 * @encrypt: encrypt packets on transmit, or authenticate only 207 * @send_sci: always include the SCI in the SecTAG 208 * @end_station: 209 * @scb: single copy broadcast flag 210 * @sa: array of secure associations 211 * @stats: stats for this TXSC 212 */ 213 struct macsec_tx_sc { 214 bool active; 215 u8 encoding_sa; 216 bool encrypt; 217 bool send_sci; 218 bool end_station; 219 bool scb; 220 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN]; 221 struct pcpu_tx_sc_stats __percpu *stats; 222 }; 223 224 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT 225 226 /** 227 * struct macsec_secy - MACsec Security Entity 228 * @netdev: netdevice for this SecY 229 * @n_rx_sc: number of receive secure channels configured on this SecY 230 * @sci: secure channel identifier used for tx 231 * @key_len: length of keys used by the cipher suite 232 * @icv_len: length of ICV used by the cipher suite 233 * @validate_frames: validation mode 234 * @operational: MAC_Operational flag 235 * @protect_frames: enable protection for this SecY 236 * @replay_protect: enable packet number checks on receive 237 * @replay_window: size of the replay window 238 * @tx_sc: transmit secure channel 239 * @rx_sc: linked list of receive secure channels 240 */ 241 struct macsec_secy { 242 struct net_device *netdev; 243 unsigned int n_rx_sc; 244 sci_t sci; 245 u16 key_len; 246 u16 icv_len; 247 enum macsec_validation_type validate_frames; 248 bool operational; 249 bool protect_frames; 250 bool replay_protect; 251 u32 replay_window; 252 struct macsec_tx_sc tx_sc; 253 struct macsec_rx_sc __rcu *rx_sc; 254 }; 255 256 struct pcpu_secy_stats { 257 struct macsec_dev_stats stats; 258 struct u64_stats_sync syncp; 259 }; 260 261 /** 262 * struct macsec_dev - private data 263 * @secy: SecY config 264 * @real_dev: pointer to underlying netdevice 265 * @stats: MACsec device stats 266 * @secys: linked list of SecY's on the underlying device 267 */ 268 struct macsec_dev { 269 struct macsec_secy secy; 270 struct net_device *real_dev; 271 struct pcpu_secy_stats __percpu *stats; 272 struct list_head secys; 273 struct gro_cells gro_cells; 274 unsigned int nest_level; 275 }; 276 277 /** 278 * struct macsec_rxh_data - rx_handler private argument 279 * @secys: linked list of SecY's on this underlying device 280 */ 281 struct macsec_rxh_data { 282 struct list_head secys; 283 }; 284 285 static struct macsec_dev *macsec_priv(const struct net_device *dev) 286 { 287 return (struct macsec_dev *)netdev_priv(dev); 288 } 289 290 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev) 291 { 292 return rcu_dereference_bh(dev->rx_handler_data); 293 } 294 295 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev) 296 { 297 return rtnl_dereference(dev->rx_handler_data); 298 } 299 300 struct macsec_cb { 301 struct aead_request *req; 302 union { 303 struct macsec_tx_sa *tx_sa; 304 struct macsec_rx_sa *rx_sa; 305 }; 306 u8 assoc_num; 307 bool valid; 308 bool has_sci; 309 }; 310 311 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr) 312 { 313 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr); 314 315 if (!sa || !sa->active) 316 return NULL; 317 318 if (!refcount_inc_not_zero(&sa->refcnt)) 319 return NULL; 320 321 return sa; 322 } 323 324 static void free_rx_sc_rcu(struct rcu_head *head) 325 { 326 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head); 327 328 free_percpu(rx_sc->stats); 329 kfree(rx_sc); 330 } 331 332 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc) 333 { 334 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL; 335 } 336 337 static void macsec_rxsc_put(struct macsec_rx_sc *sc) 338 { 339 if (refcount_dec_and_test(&sc->refcnt)) 340 call_rcu(&sc->rcu_head, free_rx_sc_rcu); 341 } 342 343 static void free_rxsa(struct rcu_head *head) 344 { 345 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu); 346 347 crypto_free_aead(sa->key.tfm); 348 free_percpu(sa->stats); 349 kfree(sa); 350 } 351 352 static void macsec_rxsa_put(struct macsec_rx_sa *sa) 353 { 354 if (refcount_dec_and_test(&sa->refcnt)) 355 call_rcu(&sa->rcu, free_rxsa); 356 } 357 358 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr) 359 { 360 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr); 361 362 if (!sa || !sa->active) 363 return NULL; 364 365 if (!refcount_inc_not_zero(&sa->refcnt)) 366 return NULL; 367 368 return sa; 369 } 370 371 static void free_txsa(struct rcu_head *head) 372 { 373 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu); 374 375 crypto_free_aead(sa->key.tfm); 376 free_percpu(sa->stats); 377 kfree(sa); 378 } 379 380 static void macsec_txsa_put(struct macsec_tx_sa *sa) 381 { 382 if (refcount_dec_and_test(&sa->refcnt)) 383 call_rcu(&sa->rcu, free_txsa); 384 } 385 386 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) 387 { 388 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); 389 return (struct macsec_cb *)skb->cb; 390 } 391 392 #define MACSEC_PORT_ES (htons(0x0001)) 393 #define MACSEC_PORT_SCB (0x0000) 394 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL) 395 396 #define MACSEC_GCM_AES_128_SAK_LEN 16 397 #define MACSEC_GCM_AES_256_SAK_LEN 32 398 399 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN 400 #define DEFAULT_SEND_SCI true 401 #define DEFAULT_ENCRYPT false 402 #define DEFAULT_ENCODING_SA 0 403 404 static bool send_sci(const struct macsec_secy *secy) 405 { 406 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 407 408 return tx_sc->send_sci || 409 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb); 410 } 411 412 static sci_t make_sci(u8 *addr, __be16 port) 413 { 414 sci_t sci; 415 416 memcpy(&sci, addr, ETH_ALEN); 417 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); 418 419 return sci; 420 } 421 422 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present) 423 { 424 sci_t sci; 425 426 if (sci_present) 427 memcpy(&sci, hdr->secure_channel_id, 428 sizeof(hdr->secure_channel_id)); 429 else 430 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); 431 432 return sci; 433 } 434 435 static unsigned int macsec_sectag_len(bool sci_present) 436 { 437 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); 438 } 439 440 static unsigned int macsec_hdr_len(bool sci_present) 441 { 442 return macsec_sectag_len(sci_present) + ETH_HLEN; 443 } 444 445 static unsigned int macsec_extra_len(bool sci_present) 446 { 447 return macsec_sectag_len(sci_present) + sizeof(__be16); 448 } 449 450 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ 451 static void macsec_fill_sectag(struct macsec_eth_header *h, 452 const struct macsec_secy *secy, u32 pn, 453 bool sci_present) 454 { 455 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 456 457 memset(&h->tci_an, 0, macsec_sectag_len(sci_present)); 458 h->eth.h_proto = htons(ETH_P_MACSEC); 459 460 if (sci_present) { 461 h->tci_an |= MACSEC_TCI_SC; 462 memcpy(&h->secure_channel_id, &secy->sci, 463 sizeof(h->secure_channel_id)); 464 } else { 465 if (tx_sc->end_station) 466 h->tci_an |= MACSEC_TCI_ES; 467 if (tx_sc->scb) 468 h->tci_an |= MACSEC_TCI_SCB; 469 } 470 471 h->packet_number = htonl(pn); 472 473 /* with GCM, C/E clear for !encrypt, both set for encrypt */ 474 if (tx_sc->encrypt) 475 h->tci_an |= MACSEC_TCI_CONFID; 476 else if (secy->icv_len != DEFAULT_ICV_LEN) 477 h->tci_an |= MACSEC_TCI_C; 478 479 h->tci_an |= tx_sc->encoding_sa; 480 } 481 482 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) 483 { 484 if (data_len < MIN_NON_SHORT_LEN) 485 h->short_length = data_len; 486 } 487 488 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */ 489 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len) 490 { 491 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; 492 int len = skb->len - 2 * ETH_ALEN; 493 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; 494 495 /* a) It comprises at least 17 octets */ 496 if (skb->len <= 16) 497 return false; 498 499 /* b) MACsec EtherType: already checked */ 500 501 /* c) V bit is clear */ 502 if (h->tci_an & MACSEC_TCI_VERSION) 503 return false; 504 505 /* d) ES or SCB => !SC */ 506 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && 507 (h->tci_an & MACSEC_TCI_SC)) 508 return false; 509 510 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ 511 if (h->unused) 512 return false; 513 514 /* rx.pn != 0 (figure 10-5) */ 515 if (!h->packet_number) 516 return false; 517 518 /* length check, f) g) h) i) */ 519 if (h->short_length) 520 return len == extra_len + h->short_length; 521 return len >= extra_len + MIN_NON_SHORT_LEN; 522 } 523 524 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) 525 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN 526 527 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) 528 { 529 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; 530 531 gcm_iv->sci = sci; 532 gcm_iv->pn = htonl(pn); 533 } 534 535 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) 536 { 537 return (struct macsec_eth_header *)skb_mac_header(skb); 538 } 539 540 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy) 541 { 542 u32 pn; 543 544 spin_lock_bh(&tx_sa->lock); 545 pn = tx_sa->next_pn; 546 547 tx_sa->next_pn++; 548 if (tx_sa->next_pn == 0) { 549 pr_debug("PN wrapped, transitioning to !oper\n"); 550 tx_sa->active = false; 551 if (secy->protect_frames) 552 secy->operational = false; 553 } 554 spin_unlock_bh(&tx_sa->lock); 555 556 return pn; 557 } 558 559 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) 560 { 561 struct macsec_dev *macsec = netdev_priv(dev); 562 563 skb->dev = macsec->real_dev; 564 skb_reset_mac_header(skb); 565 skb->protocol = eth_hdr(skb)->h_proto; 566 } 567 568 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, 569 struct macsec_tx_sa *tx_sa) 570 { 571 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); 572 573 u64_stats_update_begin(&txsc_stats->syncp); 574 if (tx_sc->encrypt) { 575 txsc_stats->stats.OutOctetsEncrypted += skb->len; 576 txsc_stats->stats.OutPktsEncrypted++; 577 this_cpu_inc(tx_sa->stats->OutPktsEncrypted); 578 } else { 579 txsc_stats->stats.OutOctetsProtected += skb->len; 580 txsc_stats->stats.OutPktsProtected++; 581 this_cpu_inc(tx_sa->stats->OutPktsProtected); 582 } 583 u64_stats_update_end(&txsc_stats->syncp); 584 } 585 586 static void count_tx(struct net_device *dev, int ret, int len) 587 { 588 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 589 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 590 591 u64_stats_update_begin(&stats->syncp); 592 stats->tx_packets++; 593 stats->tx_bytes += len; 594 u64_stats_update_end(&stats->syncp); 595 } 596 } 597 598 static void macsec_encrypt_done(struct crypto_async_request *base, int err) 599 { 600 struct sk_buff *skb = base->data; 601 struct net_device *dev = skb->dev; 602 struct macsec_dev *macsec = macsec_priv(dev); 603 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 604 int len, ret; 605 606 aead_request_free(macsec_skb_cb(skb)->req); 607 608 rcu_read_lock_bh(); 609 macsec_encrypt_finish(skb, dev); 610 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 611 len = skb->len; 612 ret = dev_queue_xmit(skb); 613 count_tx(dev, ret, len); 614 rcu_read_unlock_bh(); 615 616 macsec_txsa_put(sa); 617 dev_put(dev); 618 } 619 620 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, 621 unsigned char **iv, 622 struct scatterlist **sg, 623 int num_frags) 624 { 625 size_t size, iv_offset, sg_offset; 626 struct aead_request *req; 627 void *tmp; 628 629 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); 630 iv_offset = size; 631 size += GCM_AES_IV_LEN; 632 633 size = ALIGN(size, __alignof__(struct scatterlist)); 634 sg_offset = size; 635 size += sizeof(struct scatterlist) * num_frags; 636 637 tmp = kmalloc(size, GFP_ATOMIC); 638 if (!tmp) 639 return NULL; 640 641 *iv = (unsigned char *)(tmp + iv_offset); 642 *sg = (struct scatterlist *)(tmp + sg_offset); 643 req = tmp; 644 645 aead_request_set_tfm(req, tfm); 646 647 return req; 648 } 649 650 static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 651 struct net_device *dev) 652 { 653 int ret; 654 struct scatterlist *sg; 655 struct sk_buff *trailer; 656 unsigned char *iv; 657 struct ethhdr *eth; 658 struct macsec_eth_header *hh; 659 size_t unprotected_len; 660 struct aead_request *req; 661 struct macsec_secy *secy; 662 struct macsec_tx_sc *tx_sc; 663 struct macsec_tx_sa *tx_sa; 664 struct macsec_dev *macsec = macsec_priv(dev); 665 bool sci_present; 666 u32 pn; 667 668 secy = &macsec->secy; 669 tx_sc = &secy->tx_sc; 670 671 /* 10.5.1 TX SA assignment */ 672 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); 673 if (!tx_sa) { 674 secy->operational = false; 675 kfree_skb(skb); 676 return ERR_PTR(-EINVAL); 677 } 678 679 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || 680 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { 681 struct sk_buff *nskb = skb_copy_expand(skb, 682 MACSEC_NEEDED_HEADROOM, 683 MACSEC_NEEDED_TAILROOM, 684 GFP_ATOMIC); 685 if (likely(nskb)) { 686 consume_skb(skb); 687 skb = nskb; 688 } else { 689 macsec_txsa_put(tx_sa); 690 kfree_skb(skb); 691 return ERR_PTR(-ENOMEM); 692 } 693 } else { 694 skb = skb_unshare(skb, GFP_ATOMIC); 695 if (!skb) { 696 macsec_txsa_put(tx_sa); 697 return ERR_PTR(-ENOMEM); 698 } 699 } 700 701 unprotected_len = skb->len; 702 eth = eth_hdr(skb); 703 sci_present = send_sci(secy); 704 hh = skb_push(skb, macsec_extra_len(sci_present)); 705 memmove(hh, eth, 2 * ETH_ALEN); 706 707 pn = tx_sa_update_pn(tx_sa, secy); 708 if (pn == 0) { 709 macsec_txsa_put(tx_sa); 710 kfree_skb(skb); 711 return ERR_PTR(-ENOLINK); 712 } 713 macsec_fill_sectag(hh, secy, pn, sci_present); 714 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); 715 716 skb_put(skb, secy->icv_len); 717 718 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { 719 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 720 721 u64_stats_update_begin(&secy_stats->syncp); 722 secy_stats->stats.OutPktsTooLong++; 723 u64_stats_update_end(&secy_stats->syncp); 724 725 macsec_txsa_put(tx_sa); 726 kfree_skb(skb); 727 return ERR_PTR(-EINVAL); 728 } 729 730 ret = skb_cow_data(skb, 0, &trailer); 731 if (unlikely(ret < 0)) { 732 macsec_txsa_put(tx_sa); 733 kfree_skb(skb); 734 return ERR_PTR(ret); 735 } 736 737 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret); 738 if (!req) { 739 macsec_txsa_put(tx_sa); 740 kfree_skb(skb); 741 return ERR_PTR(-ENOMEM); 742 } 743 744 macsec_fill_iv(iv, secy->sci, pn); 745 746 sg_init_table(sg, ret); 747 ret = skb_to_sgvec(skb, sg, 0, skb->len); 748 if (unlikely(ret < 0)) { 749 aead_request_free(req); 750 macsec_txsa_put(tx_sa); 751 kfree_skb(skb); 752 return ERR_PTR(ret); 753 } 754 755 if (tx_sc->encrypt) { 756 int len = skb->len - macsec_hdr_len(sci_present) - 757 secy->icv_len; 758 aead_request_set_crypt(req, sg, sg, len, iv); 759 aead_request_set_ad(req, macsec_hdr_len(sci_present)); 760 } else { 761 aead_request_set_crypt(req, sg, sg, 0, iv); 762 aead_request_set_ad(req, skb->len - secy->icv_len); 763 } 764 765 macsec_skb_cb(skb)->req = req; 766 macsec_skb_cb(skb)->tx_sa = tx_sa; 767 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 768 769 dev_hold(skb->dev); 770 ret = crypto_aead_encrypt(req); 771 if (ret == -EINPROGRESS) { 772 return ERR_PTR(ret); 773 } else if (ret != 0) { 774 dev_put(skb->dev); 775 kfree_skb(skb); 776 aead_request_free(req); 777 macsec_txsa_put(tx_sa); 778 return ERR_PTR(-EINVAL); 779 } 780 781 dev_put(skb->dev); 782 aead_request_free(req); 783 macsec_txsa_put(tx_sa); 784 785 return skb; 786 } 787 788 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 789 { 790 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 791 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 792 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 793 u32 lowest_pn = 0; 794 795 spin_lock(&rx_sa->lock); 796 if (rx_sa->next_pn >= secy->replay_window) 797 lowest_pn = rx_sa->next_pn - secy->replay_window; 798 799 /* Now perform replay protection check again 800 * (see IEEE 802.1AE-2006 figure 10-5) 801 */ 802 if (secy->replay_protect && pn < lowest_pn) { 803 spin_unlock(&rx_sa->lock); 804 u64_stats_update_begin(&rxsc_stats->syncp); 805 rxsc_stats->stats.InPktsLate++; 806 u64_stats_update_end(&rxsc_stats->syncp); 807 return false; 808 } 809 810 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 811 u64_stats_update_begin(&rxsc_stats->syncp); 812 if (hdr->tci_an & MACSEC_TCI_E) 813 rxsc_stats->stats.InOctetsDecrypted += skb->len; 814 else 815 rxsc_stats->stats.InOctetsValidated += skb->len; 816 u64_stats_update_end(&rxsc_stats->syncp); 817 } 818 819 if (!macsec_skb_cb(skb)->valid) { 820 spin_unlock(&rx_sa->lock); 821 822 /* 10.6.5 */ 823 if (hdr->tci_an & MACSEC_TCI_C || 824 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 825 u64_stats_update_begin(&rxsc_stats->syncp); 826 rxsc_stats->stats.InPktsNotValid++; 827 u64_stats_update_end(&rxsc_stats->syncp); 828 return false; 829 } 830 831 u64_stats_update_begin(&rxsc_stats->syncp); 832 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 833 rxsc_stats->stats.InPktsInvalid++; 834 this_cpu_inc(rx_sa->stats->InPktsInvalid); 835 } else if (pn < lowest_pn) { 836 rxsc_stats->stats.InPktsDelayed++; 837 } else { 838 rxsc_stats->stats.InPktsUnchecked++; 839 } 840 u64_stats_update_end(&rxsc_stats->syncp); 841 } else { 842 u64_stats_update_begin(&rxsc_stats->syncp); 843 if (pn < lowest_pn) { 844 rxsc_stats->stats.InPktsDelayed++; 845 } else { 846 rxsc_stats->stats.InPktsOK++; 847 this_cpu_inc(rx_sa->stats->InPktsOK); 848 } 849 u64_stats_update_end(&rxsc_stats->syncp); 850 851 if (pn >= rx_sa->next_pn) 852 rx_sa->next_pn = pn + 1; 853 spin_unlock(&rx_sa->lock); 854 } 855 856 return true; 857 } 858 859 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 860 { 861 skb->pkt_type = PACKET_HOST; 862 skb->protocol = eth_type_trans(skb, dev); 863 864 skb_reset_network_header(skb); 865 if (!skb_transport_header_was_set(skb)) 866 skb_reset_transport_header(skb); 867 skb_reset_mac_len(skb); 868 } 869 870 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 871 { 872 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 873 skb_pull(skb, hdr_len); 874 pskb_trim_unique(skb, skb->len - icv_len); 875 } 876 877 static void count_rx(struct net_device *dev, int len) 878 { 879 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 880 881 u64_stats_update_begin(&stats->syncp); 882 stats->rx_packets++; 883 stats->rx_bytes += len; 884 u64_stats_update_end(&stats->syncp); 885 } 886 887 static void macsec_decrypt_done(struct crypto_async_request *base, int err) 888 { 889 struct sk_buff *skb = base->data; 890 struct net_device *dev = skb->dev; 891 struct macsec_dev *macsec = macsec_priv(dev); 892 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 893 struct macsec_rx_sc *rx_sc = rx_sa->sc; 894 int len; 895 u32 pn; 896 897 aead_request_free(macsec_skb_cb(skb)->req); 898 899 if (!err) 900 macsec_skb_cb(skb)->valid = true; 901 902 rcu_read_lock_bh(); 903 pn = ntohl(macsec_ethhdr(skb)->packet_number); 904 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 905 rcu_read_unlock_bh(); 906 kfree_skb(skb); 907 goto out; 908 } 909 910 macsec_finalize_skb(skb, macsec->secy.icv_len, 911 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 912 macsec_reset_skb(skb, macsec->secy.netdev); 913 914 len = skb->len; 915 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS) 916 count_rx(dev, len); 917 918 rcu_read_unlock_bh(); 919 920 out: 921 macsec_rxsa_put(rx_sa); 922 macsec_rxsc_put(rx_sc); 923 dev_put(dev); 924 } 925 926 static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 927 struct net_device *dev, 928 struct macsec_rx_sa *rx_sa, 929 sci_t sci, 930 struct macsec_secy *secy) 931 { 932 int ret; 933 struct scatterlist *sg; 934 struct sk_buff *trailer; 935 unsigned char *iv; 936 struct aead_request *req; 937 struct macsec_eth_header *hdr; 938 u16 icv_len = secy->icv_len; 939 940 macsec_skb_cb(skb)->valid = false; 941 skb = skb_share_check(skb, GFP_ATOMIC); 942 if (!skb) 943 return ERR_PTR(-ENOMEM); 944 945 ret = skb_cow_data(skb, 0, &trailer); 946 if (unlikely(ret < 0)) { 947 kfree_skb(skb); 948 return ERR_PTR(ret); 949 } 950 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret); 951 if (!req) { 952 kfree_skb(skb); 953 return ERR_PTR(-ENOMEM); 954 } 955 956 hdr = (struct macsec_eth_header *)skb->data; 957 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number)); 958 959 sg_init_table(sg, ret); 960 ret = skb_to_sgvec(skb, sg, 0, skb->len); 961 if (unlikely(ret < 0)) { 962 aead_request_free(req); 963 kfree_skb(skb); 964 return ERR_PTR(ret); 965 } 966 967 if (hdr->tci_an & MACSEC_TCI_E) { 968 /* confidentiality: ethernet + macsec header 969 * authenticated, encrypted payload 970 */ 971 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 972 973 aead_request_set_crypt(req, sg, sg, len, iv); 974 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 975 skb = skb_unshare(skb, GFP_ATOMIC); 976 if (!skb) { 977 aead_request_free(req); 978 return ERR_PTR(-ENOMEM); 979 } 980 } else { 981 /* integrity only: all headers + data authenticated */ 982 aead_request_set_crypt(req, sg, sg, icv_len, iv); 983 aead_request_set_ad(req, skb->len - icv_len); 984 } 985 986 macsec_skb_cb(skb)->req = req; 987 skb->dev = dev; 988 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 989 990 dev_hold(dev); 991 ret = crypto_aead_decrypt(req); 992 if (ret == -EINPROGRESS) { 993 return ERR_PTR(ret); 994 } else if (ret != 0) { 995 /* decryption/authentication failed 996 * 10.6 if validateFrames is disabled, deliver anyway 997 */ 998 if (ret != -EBADMSG) { 999 kfree_skb(skb); 1000 skb = ERR_PTR(ret); 1001 } 1002 } else { 1003 macsec_skb_cb(skb)->valid = true; 1004 } 1005 dev_put(dev); 1006 1007 aead_request_free(req); 1008 1009 return skb; 1010 } 1011 1012 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 1013 { 1014 struct macsec_rx_sc *rx_sc; 1015 1016 for_each_rxsc(secy, rx_sc) { 1017 if (rx_sc->sci == sci) 1018 return rx_sc; 1019 } 1020 1021 return NULL; 1022 } 1023 1024 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 1025 { 1026 struct macsec_rx_sc *rx_sc; 1027 1028 for_each_rxsc_rtnl(secy, rx_sc) { 1029 if (rx_sc->sci == sci) 1030 return rx_sc; 1031 } 1032 1033 return NULL; 1034 } 1035 1036 static void handle_not_macsec(struct sk_buff *skb) 1037 { 1038 struct macsec_rxh_data *rxd; 1039 struct macsec_dev *macsec; 1040 1041 rcu_read_lock(); 1042 rxd = macsec_data_rcu(skb->dev); 1043 1044 /* 10.6 If the management control validateFrames is not 1045 * Strict, frames without a SecTAG are received, counted, and 1046 * delivered to the Controlled Port 1047 */ 1048 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1049 struct sk_buff *nskb; 1050 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 1051 1052 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1053 u64_stats_update_begin(&secy_stats->syncp); 1054 secy_stats->stats.InPktsNoTag++; 1055 u64_stats_update_end(&secy_stats->syncp); 1056 continue; 1057 } 1058 1059 /* deliver on this port */ 1060 nskb = skb_clone(skb, GFP_ATOMIC); 1061 if (!nskb) 1062 break; 1063 1064 nskb->dev = macsec->secy.netdev; 1065 1066 if (netif_rx(nskb) == NET_RX_SUCCESS) { 1067 u64_stats_update_begin(&secy_stats->syncp); 1068 secy_stats->stats.InPktsUntagged++; 1069 u64_stats_update_end(&secy_stats->syncp); 1070 } 1071 } 1072 1073 rcu_read_unlock(); 1074 } 1075 1076 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 1077 { 1078 struct sk_buff *skb = *pskb; 1079 struct net_device *dev = skb->dev; 1080 struct macsec_eth_header *hdr; 1081 struct macsec_secy *secy = NULL; 1082 struct macsec_rx_sc *rx_sc; 1083 struct macsec_rx_sa *rx_sa; 1084 struct macsec_rxh_data *rxd; 1085 struct macsec_dev *macsec; 1086 sci_t sci; 1087 u32 pn; 1088 bool cbit; 1089 struct pcpu_rx_sc_stats *rxsc_stats; 1090 struct pcpu_secy_stats *secy_stats; 1091 bool pulled_sci; 1092 int ret; 1093 1094 if (skb_headroom(skb) < ETH_HLEN) 1095 goto drop_direct; 1096 1097 hdr = macsec_ethhdr(skb); 1098 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) { 1099 handle_not_macsec(skb); 1100 1101 /* and deliver to the uncontrolled port */ 1102 return RX_HANDLER_PASS; 1103 } 1104 1105 skb = skb_unshare(skb, GFP_ATOMIC); 1106 if (!skb) { 1107 *pskb = NULL; 1108 return RX_HANDLER_CONSUMED; 1109 } 1110 1111 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1112 if (!pulled_sci) { 1113 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1114 goto drop_direct; 1115 } 1116 1117 hdr = macsec_ethhdr(skb); 1118 1119 /* Frames with a SecTAG that has the TCI E bit set but the C 1120 * bit clear are discarded, as this reserved encoding is used 1121 * to identify frames with a SecTAG that are not to be 1122 * delivered to the Controlled Port. 1123 */ 1124 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1125 return RX_HANDLER_PASS; 1126 1127 /* now, pull the extra length */ 1128 if (hdr->tci_an & MACSEC_TCI_SC) { 1129 if (!pulled_sci) 1130 goto drop_direct; 1131 } 1132 1133 /* ethernet header is part of crypto processing */ 1134 skb_push(skb, ETH_HLEN); 1135 1136 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1137 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1138 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci); 1139 1140 rcu_read_lock(); 1141 rxd = macsec_data_rcu(skb->dev); 1142 1143 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1144 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1145 sc = sc ? macsec_rxsc_get(sc) : NULL; 1146 1147 if (sc) { 1148 secy = &macsec->secy; 1149 rx_sc = sc; 1150 break; 1151 } 1152 } 1153 1154 if (!secy) 1155 goto nosci; 1156 1157 dev = secy->netdev; 1158 macsec = macsec_priv(dev); 1159 secy_stats = this_cpu_ptr(macsec->stats); 1160 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1161 1162 if (!macsec_validate_skb(skb, secy->icv_len)) { 1163 u64_stats_update_begin(&secy_stats->syncp); 1164 secy_stats->stats.InPktsBadTag++; 1165 u64_stats_update_end(&secy_stats->syncp); 1166 goto drop_nosa; 1167 } 1168 1169 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1170 if (!rx_sa) { 1171 /* 10.6.1 if the SA is not in use */ 1172 1173 /* If validateFrames is Strict or the C bit in the 1174 * SecTAG is set, discard 1175 */ 1176 if (hdr->tci_an & MACSEC_TCI_C || 1177 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1178 u64_stats_update_begin(&rxsc_stats->syncp); 1179 rxsc_stats->stats.InPktsNotUsingSA++; 1180 u64_stats_update_end(&rxsc_stats->syncp); 1181 goto drop_nosa; 1182 } 1183 1184 /* not Strict, the frame (with the SecTAG and ICV 1185 * removed) is delivered to the Controlled Port. 1186 */ 1187 u64_stats_update_begin(&rxsc_stats->syncp); 1188 rxsc_stats->stats.InPktsUnusedSA++; 1189 u64_stats_update_end(&rxsc_stats->syncp); 1190 goto deliver; 1191 } 1192 1193 /* First, PN check to avoid decrypting obviously wrong packets */ 1194 pn = ntohl(hdr->packet_number); 1195 if (secy->replay_protect) { 1196 bool late; 1197 1198 spin_lock(&rx_sa->lock); 1199 late = rx_sa->next_pn >= secy->replay_window && 1200 pn < (rx_sa->next_pn - secy->replay_window); 1201 spin_unlock(&rx_sa->lock); 1202 1203 if (late) { 1204 u64_stats_update_begin(&rxsc_stats->syncp); 1205 rxsc_stats->stats.InPktsLate++; 1206 u64_stats_update_end(&rxsc_stats->syncp); 1207 goto drop; 1208 } 1209 } 1210 1211 macsec_skb_cb(skb)->rx_sa = rx_sa; 1212 1213 /* Disabled && !changed text => skip validation */ 1214 if (hdr->tci_an & MACSEC_TCI_C || 1215 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1216 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1217 1218 if (IS_ERR(skb)) { 1219 /* the decrypt callback needs the reference */ 1220 if (PTR_ERR(skb) != -EINPROGRESS) { 1221 macsec_rxsa_put(rx_sa); 1222 macsec_rxsc_put(rx_sc); 1223 } 1224 rcu_read_unlock(); 1225 *pskb = NULL; 1226 return RX_HANDLER_CONSUMED; 1227 } 1228 1229 if (!macsec_post_decrypt(skb, secy, pn)) 1230 goto drop; 1231 1232 deliver: 1233 macsec_finalize_skb(skb, secy->icv_len, 1234 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1235 macsec_reset_skb(skb, secy->netdev); 1236 1237 if (rx_sa) 1238 macsec_rxsa_put(rx_sa); 1239 macsec_rxsc_put(rx_sc); 1240 1241 ret = gro_cells_receive(&macsec->gro_cells, skb); 1242 if (ret == NET_RX_SUCCESS) 1243 count_rx(dev, skb->len); 1244 else 1245 macsec->secy.netdev->stats.rx_dropped++; 1246 1247 rcu_read_unlock(); 1248 1249 *pskb = NULL; 1250 return RX_HANDLER_CONSUMED; 1251 1252 drop: 1253 macsec_rxsa_put(rx_sa); 1254 drop_nosa: 1255 macsec_rxsc_put(rx_sc); 1256 rcu_read_unlock(); 1257 drop_direct: 1258 kfree_skb(skb); 1259 *pskb = NULL; 1260 return RX_HANDLER_CONSUMED; 1261 1262 nosci: 1263 /* 10.6.1 if the SC is not found */ 1264 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1265 if (!cbit) 1266 macsec_finalize_skb(skb, DEFAULT_ICV_LEN, 1267 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1268 1269 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1270 struct sk_buff *nskb; 1271 1272 secy_stats = this_cpu_ptr(macsec->stats); 1273 1274 /* If validateFrames is Strict or the C bit in the 1275 * SecTAG is set, discard 1276 */ 1277 if (cbit || 1278 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1279 u64_stats_update_begin(&secy_stats->syncp); 1280 secy_stats->stats.InPktsNoSCI++; 1281 u64_stats_update_end(&secy_stats->syncp); 1282 continue; 1283 } 1284 1285 /* not strict, the frame (with the SecTAG and ICV 1286 * removed) is delivered to the Controlled Port. 1287 */ 1288 nskb = skb_clone(skb, GFP_ATOMIC); 1289 if (!nskb) 1290 break; 1291 1292 macsec_reset_skb(nskb, macsec->secy.netdev); 1293 1294 ret = netif_rx(nskb); 1295 if (ret == NET_RX_SUCCESS) { 1296 u64_stats_update_begin(&secy_stats->syncp); 1297 secy_stats->stats.InPktsUnknownSCI++; 1298 u64_stats_update_end(&secy_stats->syncp); 1299 } else { 1300 macsec->secy.netdev->stats.rx_dropped++; 1301 } 1302 } 1303 1304 rcu_read_unlock(); 1305 *pskb = skb; 1306 return RX_HANDLER_PASS; 1307 } 1308 1309 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1310 { 1311 struct crypto_aead *tfm; 1312 int ret; 1313 1314 tfm = crypto_alloc_aead("gcm(aes)", 0, 0); 1315 1316 if (IS_ERR(tfm)) 1317 return tfm; 1318 1319 ret = crypto_aead_setkey(tfm, key, key_len); 1320 if (ret < 0) 1321 goto fail; 1322 1323 ret = crypto_aead_setauthsize(tfm, icv_len); 1324 if (ret < 0) 1325 goto fail; 1326 1327 return tfm; 1328 fail: 1329 crypto_free_aead(tfm); 1330 return ERR_PTR(ret); 1331 } 1332 1333 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1334 int icv_len) 1335 { 1336 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1337 if (!rx_sa->stats) 1338 return -ENOMEM; 1339 1340 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1341 if (IS_ERR(rx_sa->key.tfm)) { 1342 free_percpu(rx_sa->stats); 1343 return PTR_ERR(rx_sa->key.tfm); 1344 } 1345 1346 rx_sa->active = false; 1347 rx_sa->next_pn = 1; 1348 refcount_set(&rx_sa->refcnt, 1); 1349 spin_lock_init(&rx_sa->lock); 1350 1351 return 0; 1352 } 1353 1354 static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1355 { 1356 rx_sa->active = false; 1357 1358 macsec_rxsa_put(rx_sa); 1359 } 1360 1361 static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1362 { 1363 int i; 1364 1365 for (i = 0; i < MACSEC_NUM_AN; i++) { 1366 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1367 1368 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1369 if (sa) 1370 clear_rx_sa(sa); 1371 } 1372 1373 macsec_rxsc_put(rx_sc); 1374 } 1375 1376 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1377 { 1378 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1379 1380 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1381 rx_sc; 1382 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1383 if (rx_sc->sci == sci) { 1384 if (rx_sc->active) 1385 secy->n_rx_sc--; 1386 rcu_assign_pointer(*rx_scp, rx_sc->next); 1387 return rx_sc; 1388 } 1389 } 1390 1391 return NULL; 1392 } 1393 1394 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci) 1395 { 1396 struct macsec_rx_sc *rx_sc; 1397 struct macsec_dev *macsec; 1398 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1399 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1400 struct macsec_secy *secy; 1401 1402 list_for_each_entry(macsec, &rxd->secys, secys) { 1403 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1404 return ERR_PTR(-EEXIST); 1405 } 1406 1407 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL); 1408 if (!rx_sc) 1409 return ERR_PTR(-ENOMEM); 1410 1411 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1412 if (!rx_sc->stats) { 1413 kfree(rx_sc); 1414 return ERR_PTR(-ENOMEM); 1415 } 1416 1417 rx_sc->sci = sci; 1418 rx_sc->active = true; 1419 refcount_set(&rx_sc->refcnt, 1); 1420 1421 secy = &macsec_priv(dev)->secy; 1422 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1423 rcu_assign_pointer(secy->rx_sc, rx_sc); 1424 1425 if (rx_sc->active) 1426 secy->n_rx_sc++; 1427 1428 return rx_sc; 1429 } 1430 1431 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1432 int icv_len) 1433 { 1434 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1435 if (!tx_sa->stats) 1436 return -ENOMEM; 1437 1438 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1439 if (IS_ERR(tx_sa->key.tfm)) { 1440 free_percpu(tx_sa->stats); 1441 return PTR_ERR(tx_sa->key.tfm); 1442 } 1443 1444 tx_sa->active = false; 1445 refcount_set(&tx_sa->refcnt, 1); 1446 spin_lock_init(&tx_sa->lock); 1447 1448 return 0; 1449 } 1450 1451 static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1452 { 1453 tx_sa->active = false; 1454 1455 macsec_txsa_put(tx_sa); 1456 } 1457 1458 static struct genl_family macsec_fam; 1459 1460 static struct net_device *get_dev_from_nl(struct net *net, 1461 struct nlattr **attrs) 1462 { 1463 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1464 struct net_device *dev; 1465 1466 dev = __dev_get_by_index(net, ifindex); 1467 if (!dev) 1468 return ERR_PTR(-ENODEV); 1469 1470 if (!netif_is_macsec(dev)) 1471 return ERR_PTR(-ENODEV); 1472 1473 return dev; 1474 } 1475 1476 static sci_t nla_get_sci(const struct nlattr *nla) 1477 { 1478 return (__force sci_t)nla_get_u64(nla); 1479 } 1480 1481 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, 1482 int padattr) 1483 { 1484 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); 1485 } 1486 1487 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1488 struct nlattr **attrs, 1489 struct nlattr **tb_sa, 1490 struct net_device **devp, 1491 struct macsec_secy **secyp, 1492 struct macsec_tx_sc **scp, 1493 u8 *assoc_num) 1494 { 1495 struct net_device *dev; 1496 struct macsec_secy *secy; 1497 struct macsec_tx_sc *tx_sc; 1498 struct macsec_tx_sa *tx_sa; 1499 1500 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1501 return ERR_PTR(-EINVAL); 1502 1503 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1504 1505 dev = get_dev_from_nl(net, attrs); 1506 if (IS_ERR(dev)) 1507 return ERR_CAST(dev); 1508 1509 if (*assoc_num >= MACSEC_NUM_AN) 1510 return ERR_PTR(-EINVAL); 1511 1512 secy = &macsec_priv(dev)->secy; 1513 tx_sc = &secy->tx_sc; 1514 1515 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1516 if (!tx_sa) 1517 return ERR_PTR(-ENODEV); 1518 1519 *devp = dev; 1520 *scp = tx_sc; 1521 *secyp = secy; 1522 return tx_sa; 1523 } 1524 1525 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1526 struct nlattr **attrs, 1527 struct nlattr **tb_rxsc, 1528 struct net_device **devp, 1529 struct macsec_secy **secyp) 1530 { 1531 struct net_device *dev; 1532 struct macsec_secy *secy; 1533 struct macsec_rx_sc *rx_sc; 1534 sci_t sci; 1535 1536 dev = get_dev_from_nl(net, attrs); 1537 if (IS_ERR(dev)) 1538 return ERR_CAST(dev); 1539 1540 secy = &macsec_priv(dev)->secy; 1541 1542 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1543 return ERR_PTR(-EINVAL); 1544 1545 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1546 rx_sc = find_rx_sc_rtnl(secy, sci); 1547 if (!rx_sc) 1548 return ERR_PTR(-ENODEV); 1549 1550 *secyp = secy; 1551 *devp = dev; 1552 1553 return rx_sc; 1554 } 1555 1556 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1557 struct nlattr **attrs, 1558 struct nlattr **tb_rxsc, 1559 struct nlattr **tb_sa, 1560 struct net_device **devp, 1561 struct macsec_secy **secyp, 1562 struct macsec_rx_sc **scp, 1563 u8 *assoc_num) 1564 { 1565 struct macsec_rx_sc *rx_sc; 1566 struct macsec_rx_sa *rx_sa; 1567 1568 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1569 return ERR_PTR(-EINVAL); 1570 1571 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1572 if (*assoc_num >= MACSEC_NUM_AN) 1573 return ERR_PTR(-EINVAL); 1574 1575 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1576 if (IS_ERR(rx_sc)) 1577 return ERR_CAST(rx_sc); 1578 1579 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1580 if (!rx_sa) 1581 return ERR_PTR(-ENODEV); 1582 1583 *scp = rx_sc; 1584 return rx_sa; 1585 } 1586 1587 1588 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1589 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1590 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1591 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1592 }; 1593 1594 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1595 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1596 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, 1597 }; 1598 1599 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1600 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, 1601 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, 1602 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 }, 1603 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY, 1604 .len = MACSEC_KEYID_LEN, }, 1605 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1606 .len = MACSEC_MAX_KEY_LEN, }, 1607 }; 1608 1609 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1610 { 1611 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1612 return -EINVAL; 1613 1614 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, 1615 attrs[MACSEC_ATTR_SA_CONFIG], 1616 macsec_genl_sa_policy, NULL)) 1617 return -EINVAL; 1618 1619 return 0; 1620 } 1621 1622 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1623 { 1624 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1625 return -EINVAL; 1626 1627 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, 1628 attrs[MACSEC_ATTR_RXSC_CONFIG], 1629 macsec_genl_rxsc_policy, NULL)) 1630 return -EINVAL; 1631 1632 return 0; 1633 } 1634 1635 static bool validate_add_rxsa(struct nlattr **attrs) 1636 { 1637 if (!attrs[MACSEC_SA_ATTR_AN] || 1638 !attrs[MACSEC_SA_ATTR_KEY] || 1639 !attrs[MACSEC_SA_ATTR_KEYID]) 1640 return false; 1641 1642 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1643 return false; 1644 1645 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1646 return false; 1647 1648 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1649 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1650 return false; 1651 } 1652 1653 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1654 return false; 1655 1656 return true; 1657 } 1658 1659 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1660 { 1661 struct net_device *dev; 1662 struct nlattr **attrs = info->attrs; 1663 struct macsec_secy *secy; 1664 struct macsec_rx_sc *rx_sc; 1665 struct macsec_rx_sa *rx_sa; 1666 unsigned char assoc_num; 1667 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1668 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1669 int err; 1670 1671 if (!attrs[MACSEC_ATTR_IFINDEX]) 1672 return -EINVAL; 1673 1674 if (parse_sa_config(attrs, tb_sa)) 1675 return -EINVAL; 1676 1677 if (parse_rxsc_config(attrs, tb_rxsc)) 1678 return -EINVAL; 1679 1680 if (!validate_add_rxsa(tb_sa)) 1681 return -EINVAL; 1682 1683 rtnl_lock(); 1684 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1685 if (IS_ERR(rx_sc)) { 1686 rtnl_unlock(); 1687 return PTR_ERR(rx_sc); 1688 } 1689 1690 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1691 1692 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1693 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1694 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1695 rtnl_unlock(); 1696 return -EINVAL; 1697 } 1698 1699 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1700 if (rx_sa) { 1701 rtnl_unlock(); 1702 return -EBUSY; 1703 } 1704 1705 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1706 if (!rx_sa) { 1707 rtnl_unlock(); 1708 return -ENOMEM; 1709 } 1710 1711 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1712 secy->key_len, secy->icv_len); 1713 if (err < 0) { 1714 kfree(rx_sa); 1715 rtnl_unlock(); 1716 return err; 1717 } 1718 1719 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1720 spin_lock_bh(&rx_sa->lock); 1721 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1722 spin_unlock_bh(&rx_sa->lock); 1723 } 1724 1725 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1726 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1727 1728 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1729 rx_sa->sc = rx_sc; 1730 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1731 1732 rtnl_unlock(); 1733 1734 return 0; 1735 } 1736 1737 static bool validate_add_rxsc(struct nlattr **attrs) 1738 { 1739 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1740 return false; 1741 1742 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1743 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1744 return false; 1745 } 1746 1747 return true; 1748 } 1749 1750 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1751 { 1752 struct net_device *dev; 1753 sci_t sci = MACSEC_UNDEF_SCI; 1754 struct nlattr **attrs = info->attrs; 1755 struct macsec_rx_sc *rx_sc; 1756 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1757 1758 if (!attrs[MACSEC_ATTR_IFINDEX]) 1759 return -EINVAL; 1760 1761 if (parse_rxsc_config(attrs, tb_rxsc)) 1762 return -EINVAL; 1763 1764 if (!validate_add_rxsc(tb_rxsc)) 1765 return -EINVAL; 1766 1767 rtnl_lock(); 1768 dev = get_dev_from_nl(genl_info_net(info), attrs); 1769 if (IS_ERR(dev)) { 1770 rtnl_unlock(); 1771 return PTR_ERR(dev); 1772 } 1773 1774 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1775 1776 rx_sc = create_rx_sc(dev, sci); 1777 if (IS_ERR(rx_sc)) { 1778 rtnl_unlock(); 1779 return PTR_ERR(rx_sc); 1780 } 1781 1782 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1783 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1784 1785 rtnl_unlock(); 1786 1787 return 0; 1788 } 1789 1790 static bool validate_add_txsa(struct nlattr **attrs) 1791 { 1792 if (!attrs[MACSEC_SA_ATTR_AN] || 1793 !attrs[MACSEC_SA_ATTR_PN] || 1794 !attrs[MACSEC_SA_ATTR_KEY] || 1795 !attrs[MACSEC_SA_ATTR_KEYID]) 1796 return false; 1797 1798 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1799 return false; 1800 1801 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1802 return false; 1803 1804 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1805 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1806 return false; 1807 } 1808 1809 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1810 return false; 1811 1812 return true; 1813 } 1814 1815 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1816 { 1817 struct net_device *dev; 1818 struct nlattr **attrs = info->attrs; 1819 struct macsec_secy *secy; 1820 struct macsec_tx_sc *tx_sc; 1821 struct macsec_tx_sa *tx_sa; 1822 unsigned char assoc_num; 1823 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1824 int err; 1825 1826 if (!attrs[MACSEC_ATTR_IFINDEX]) 1827 return -EINVAL; 1828 1829 if (parse_sa_config(attrs, tb_sa)) 1830 return -EINVAL; 1831 1832 if (!validate_add_txsa(tb_sa)) 1833 return -EINVAL; 1834 1835 rtnl_lock(); 1836 dev = get_dev_from_nl(genl_info_net(info), attrs); 1837 if (IS_ERR(dev)) { 1838 rtnl_unlock(); 1839 return PTR_ERR(dev); 1840 } 1841 1842 secy = &macsec_priv(dev)->secy; 1843 tx_sc = &secy->tx_sc; 1844 1845 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1846 1847 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1848 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 1849 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1850 rtnl_unlock(); 1851 return -EINVAL; 1852 } 1853 1854 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 1855 if (tx_sa) { 1856 rtnl_unlock(); 1857 return -EBUSY; 1858 } 1859 1860 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 1861 if (!tx_sa) { 1862 rtnl_unlock(); 1863 return -ENOMEM; 1864 } 1865 1866 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1867 secy->key_len, secy->icv_len); 1868 if (err < 0) { 1869 kfree(tx_sa); 1870 rtnl_unlock(); 1871 return err; 1872 } 1873 1874 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1875 1876 spin_lock_bh(&tx_sa->lock); 1877 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1878 spin_unlock_bh(&tx_sa->lock); 1879 1880 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1881 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1882 1883 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 1884 secy->operational = true; 1885 1886 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 1887 1888 rtnl_unlock(); 1889 1890 return 0; 1891 } 1892 1893 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 1894 { 1895 struct nlattr **attrs = info->attrs; 1896 struct net_device *dev; 1897 struct macsec_secy *secy; 1898 struct macsec_rx_sc *rx_sc; 1899 struct macsec_rx_sa *rx_sa; 1900 u8 assoc_num; 1901 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1902 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1903 1904 if (!attrs[MACSEC_ATTR_IFINDEX]) 1905 return -EINVAL; 1906 1907 if (parse_sa_config(attrs, tb_sa)) 1908 return -EINVAL; 1909 1910 if (parse_rxsc_config(attrs, tb_rxsc)) 1911 return -EINVAL; 1912 1913 rtnl_lock(); 1914 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 1915 &dev, &secy, &rx_sc, &assoc_num); 1916 if (IS_ERR(rx_sa)) { 1917 rtnl_unlock(); 1918 return PTR_ERR(rx_sa); 1919 } 1920 1921 if (rx_sa->active) { 1922 rtnl_unlock(); 1923 return -EBUSY; 1924 } 1925 1926 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 1927 clear_rx_sa(rx_sa); 1928 1929 rtnl_unlock(); 1930 1931 return 0; 1932 } 1933 1934 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 1935 { 1936 struct nlattr **attrs = info->attrs; 1937 struct net_device *dev; 1938 struct macsec_secy *secy; 1939 struct macsec_rx_sc *rx_sc; 1940 sci_t sci; 1941 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1942 1943 if (!attrs[MACSEC_ATTR_IFINDEX]) 1944 return -EINVAL; 1945 1946 if (parse_rxsc_config(attrs, tb_rxsc)) 1947 return -EINVAL; 1948 1949 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1950 return -EINVAL; 1951 1952 rtnl_lock(); 1953 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 1954 if (IS_ERR(dev)) { 1955 rtnl_unlock(); 1956 return PTR_ERR(dev); 1957 } 1958 1959 secy = &macsec_priv(dev)->secy; 1960 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1961 1962 rx_sc = del_rx_sc(secy, sci); 1963 if (!rx_sc) { 1964 rtnl_unlock(); 1965 return -ENODEV; 1966 } 1967 1968 free_rx_sc(rx_sc); 1969 rtnl_unlock(); 1970 1971 return 0; 1972 } 1973 1974 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 1975 { 1976 struct nlattr **attrs = info->attrs; 1977 struct net_device *dev; 1978 struct macsec_secy *secy; 1979 struct macsec_tx_sc *tx_sc; 1980 struct macsec_tx_sa *tx_sa; 1981 u8 assoc_num; 1982 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1983 1984 if (!attrs[MACSEC_ATTR_IFINDEX]) 1985 return -EINVAL; 1986 1987 if (parse_sa_config(attrs, tb_sa)) 1988 return -EINVAL; 1989 1990 rtnl_lock(); 1991 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 1992 &dev, &secy, &tx_sc, &assoc_num); 1993 if (IS_ERR(tx_sa)) { 1994 rtnl_unlock(); 1995 return PTR_ERR(tx_sa); 1996 } 1997 1998 if (tx_sa->active) { 1999 rtnl_unlock(); 2000 return -EBUSY; 2001 } 2002 2003 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 2004 clear_tx_sa(tx_sa); 2005 2006 rtnl_unlock(); 2007 2008 return 0; 2009 } 2010 2011 static bool validate_upd_sa(struct nlattr **attrs) 2012 { 2013 if (!attrs[MACSEC_SA_ATTR_AN] || 2014 attrs[MACSEC_SA_ATTR_KEY] || 2015 attrs[MACSEC_SA_ATTR_KEYID]) 2016 return false; 2017 2018 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 2019 return false; 2020 2021 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 2022 return false; 2023 2024 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 2025 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 2026 return false; 2027 } 2028 2029 return true; 2030 } 2031 2032 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2033 { 2034 struct nlattr **attrs = info->attrs; 2035 struct net_device *dev; 2036 struct macsec_secy *secy; 2037 struct macsec_tx_sc *tx_sc; 2038 struct macsec_tx_sa *tx_sa; 2039 u8 assoc_num; 2040 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2041 2042 if (!attrs[MACSEC_ATTR_IFINDEX]) 2043 return -EINVAL; 2044 2045 if (parse_sa_config(attrs, tb_sa)) 2046 return -EINVAL; 2047 2048 if (!validate_upd_sa(tb_sa)) 2049 return -EINVAL; 2050 2051 rtnl_lock(); 2052 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2053 &dev, &secy, &tx_sc, &assoc_num); 2054 if (IS_ERR(tx_sa)) { 2055 rtnl_unlock(); 2056 return PTR_ERR(tx_sa); 2057 } 2058 2059 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2060 spin_lock_bh(&tx_sa->lock); 2061 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 2062 spin_unlock_bh(&tx_sa->lock); 2063 } 2064 2065 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2066 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2067 2068 if (assoc_num == tx_sc->encoding_sa) 2069 secy->operational = tx_sa->active; 2070 2071 rtnl_unlock(); 2072 2073 return 0; 2074 } 2075 2076 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2077 { 2078 struct nlattr **attrs = info->attrs; 2079 struct net_device *dev; 2080 struct macsec_secy *secy; 2081 struct macsec_rx_sc *rx_sc; 2082 struct macsec_rx_sa *rx_sa; 2083 u8 assoc_num; 2084 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2085 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2086 2087 if (!attrs[MACSEC_ATTR_IFINDEX]) 2088 return -EINVAL; 2089 2090 if (parse_rxsc_config(attrs, tb_rxsc)) 2091 return -EINVAL; 2092 2093 if (parse_sa_config(attrs, tb_sa)) 2094 return -EINVAL; 2095 2096 if (!validate_upd_sa(tb_sa)) 2097 return -EINVAL; 2098 2099 rtnl_lock(); 2100 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2101 &dev, &secy, &rx_sc, &assoc_num); 2102 if (IS_ERR(rx_sa)) { 2103 rtnl_unlock(); 2104 return PTR_ERR(rx_sa); 2105 } 2106 2107 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2108 spin_lock_bh(&rx_sa->lock); 2109 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 2110 spin_unlock_bh(&rx_sa->lock); 2111 } 2112 2113 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2114 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2115 2116 rtnl_unlock(); 2117 return 0; 2118 } 2119 2120 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2121 { 2122 struct nlattr **attrs = info->attrs; 2123 struct net_device *dev; 2124 struct macsec_secy *secy; 2125 struct macsec_rx_sc *rx_sc; 2126 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2127 2128 if (!attrs[MACSEC_ATTR_IFINDEX]) 2129 return -EINVAL; 2130 2131 if (parse_rxsc_config(attrs, tb_rxsc)) 2132 return -EINVAL; 2133 2134 if (!validate_add_rxsc(tb_rxsc)) 2135 return -EINVAL; 2136 2137 rtnl_lock(); 2138 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2139 if (IS_ERR(rx_sc)) { 2140 rtnl_unlock(); 2141 return PTR_ERR(rx_sc); 2142 } 2143 2144 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2145 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2146 2147 if (rx_sc->active != new) 2148 secy->n_rx_sc += new ? 1 : -1; 2149 2150 rx_sc->active = new; 2151 } 2152 2153 rtnl_unlock(); 2154 2155 return 0; 2156 } 2157 2158 static int copy_tx_sa_stats(struct sk_buff *skb, 2159 struct macsec_tx_sa_stats __percpu *pstats) 2160 { 2161 struct macsec_tx_sa_stats sum = {0, }; 2162 int cpu; 2163 2164 for_each_possible_cpu(cpu) { 2165 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2166 2167 sum.OutPktsProtected += stats->OutPktsProtected; 2168 sum.OutPktsEncrypted += stats->OutPktsEncrypted; 2169 } 2170 2171 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) || 2172 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted)) 2173 return -EMSGSIZE; 2174 2175 return 0; 2176 } 2177 2178 static int copy_rx_sa_stats(struct sk_buff *skb, 2179 struct macsec_rx_sa_stats __percpu *pstats) 2180 { 2181 struct macsec_rx_sa_stats sum = {0, }; 2182 int cpu; 2183 2184 for_each_possible_cpu(cpu) { 2185 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2186 2187 sum.InPktsOK += stats->InPktsOK; 2188 sum.InPktsInvalid += stats->InPktsInvalid; 2189 sum.InPktsNotValid += stats->InPktsNotValid; 2190 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA; 2191 sum.InPktsUnusedSA += stats->InPktsUnusedSA; 2192 } 2193 2194 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) || 2195 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) || 2196 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) || 2197 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) || 2198 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA)) 2199 return -EMSGSIZE; 2200 2201 return 0; 2202 } 2203 2204 static int copy_rx_sc_stats(struct sk_buff *skb, 2205 struct pcpu_rx_sc_stats __percpu *pstats) 2206 { 2207 struct macsec_rx_sc_stats sum = {0, }; 2208 int cpu; 2209 2210 for_each_possible_cpu(cpu) { 2211 const struct pcpu_rx_sc_stats *stats; 2212 struct macsec_rx_sc_stats tmp; 2213 unsigned int start; 2214 2215 stats = per_cpu_ptr(pstats, cpu); 2216 do { 2217 start = u64_stats_fetch_begin_irq(&stats->syncp); 2218 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2219 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2220 2221 sum.InOctetsValidated += tmp.InOctetsValidated; 2222 sum.InOctetsDecrypted += tmp.InOctetsDecrypted; 2223 sum.InPktsUnchecked += tmp.InPktsUnchecked; 2224 sum.InPktsDelayed += tmp.InPktsDelayed; 2225 sum.InPktsOK += tmp.InPktsOK; 2226 sum.InPktsInvalid += tmp.InPktsInvalid; 2227 sum.InPktsLate += tmp.InPktsLate; 2228 sum.InPktsNotValid += tmp.InPktsNotValid; 2229 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2230 sum.InPktsUnusedSA += tmp.InPktsUnusedSA; 2231 } 2232 2233 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2234 sum.InOctetsValidated, 2235 MACSEC_RXSC_STATS_ATTR_PAD) || 2236 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2237 sum.InOctetsDecrypted, 2238 MACSEC_RXSC_STATS_ATTR_PAD) || 2239 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2240 sum.InPktsUnchecked, 2241 MACSEC_RXSC_STATS_ATTR_PAD) || 2242 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2243 sum.InPktsDelayed, 2244 MACSEC_RXSC_STATS_ATTR_PAD) || 2245 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2246 sum.InPktsOK, 2247 MACSEC_RXSC_STATS_ATTR_PAD) || 2248 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2249 sum.InPktsInvalid, 2250 MACSEC_RXSC_STATS_ATTR_PAD) || 2251 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2252 sum.InPktsLate, 2253 MACSEC_RXSC_STATS_ATTR_PAD) || 2254 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2255 sum.InPktsNotValid, 2256 MACSEC_RXSC_STATS_ATTR_PAD) || 2257 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2258 sum.InPktsNotUsingSA, 2259 MACSEC_RXSC_STATS_ATTR_PAD) || 2260 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2261 sum.InPktsUnusedSA, 2262 MACSEC_RXSC_STATS_ATTR_PAD)) 2263 return -EMSGSIZE; 2264 2265 return 0; 2266 } 2267 2268 static int copy_tx_sc_stats(struct sk_buff *skb, 2269 struct pcpu_tx_sc_stats __percpu *pstats) 2270 { 2271 struct macsec_tx_sc_stats sum = {0, }; 2272 int cpu; 2273 2274 for_each_possible_cpu(cpu) { 2275 const struct pcpu_tx_sc_stats *stats; 2276 struct macsec_tx_sc_stats tmp; 2277 unsigned int start; 2278 2279 stats = per_cpu_ptr(pstats, cpu); 2280 do { 2281 start = u64_stats_fetch_begin_irq(&stats->syncp); 2282 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2283 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2284 2285 sum.OutPktsProtected += tmp.OutPktsProtected; 2286 sum.OutPktsEncrypted += tmp.OutPktsEncrypted; 2287 sum.OutOctetsProtected += tmp.OutOctetsProtected; 2288 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2289 } 2290 2291 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2292 sum.OutPktsProtected, 2293 MACSEC_TXSC_STATS_ATTR_PAD) || 2294 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2295 sum.OutPktsEncrypted, 2296 MACSEC_TXSC_STATS_ATTR_PAD) || 2297 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2298 sum.OutOctetsProtected, 2299 MACSEC_TXSC_STATS_ATTR_PAD) || 2300 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2301 sum.OutOctetsEncrypted, 2302 MACSEC_TXSC_STATS_ATTR_PAD)) 2303 return -EMSGSIZE; 2304 2305 return 0; 2306 } 2307 2308 static int copy_secy_stats(struct sk_buff *skb, 2309 struct pcpu_secy_stats __percpu *pstats) 2310 { 2311 struct macsec_dev_stats sum = {0, }; 2312 int cpu; 2313 2314 for_each_possible_cpu(cpu) { 2315 const struct pcpu_secy_stats *stats; 2316 struct macsec_dev_stats tmp; 2317 unsigned int start; 2318 2319 stats = per_cpu_ptr(pstats, cpu); 2320 do { 2321 start = u64_stats_fetch_begin_irq(&stats->syncp); 2322 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2323 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2324 2325 sum.OutPktsUntagged += tmp.OutPktsUntagged; 2326 sum.InPktsUntagged += tmp.InPktsUntagged; 2327 sum.OutPktsTooLong += tmp.OutPktsTooLong; 2328 sum.InPktsNoTag += tmp.InPktsNoTag; 2329 sum.InPktsBadTag += tmp.InPktsBadTag; 2330 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2331 sum.InPktsNoSCI += tmp.InPktsNoSCI; 2332 sum.InPktsOverrun += tmp.InPktsOverrun; 2333 } 2334 2335 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 2336 sum.OutPktsUntagged, 2337 MACSEC_SECY_STATS_ATTR_PAD) || 2338 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 2339 sum.InPktsUntagged, 2340 MACSEC_SECY_STATS_ATTR_PAD) || 2341 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 2342 sum.OutPktsTooLong, 2343 MACSEC_SECY_STATS_ATTR_PAD) || 2344 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 2345 sum.InPktsNoTag, 2346 MACSEC_SECY_STATS_ATTR_PAD) || 2347 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 2348 sum.InPktsBadTag, 2349 MACSEC_SECY_STATS_ATTR_PAD) || 2350 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 2351 sum.InPktsUnknownSCI, 2352 MACSEC_SECY_STATS_ATTR_PAD) || 2353 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 2354 sum.InPktsNoSCI, 2355 MACSEC_SECY_STATS_ATTR_PAD) || 2356 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 2357 sum.InPktsOverrun, 2358 MACSEC_SECY_STATS_ATTR_PAD)) 2359 return -EMSGSIZE; 2360 2361 return 0; 2362 } 2363 2364 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 2365 { 2366 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2367 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY); 2368 u64 csid; 2369 2370 if (!secy_nest) 2371 return 1; 2372 2373 switch (secy->key_len) { 2374 case MACSEC_GCM_AES_128_SAK_LEN: 2375 csid = MACSEC_DEFAULT_CIPHER_ID; 2376 break; 2377 case MACSEC_GCM_AES_256_SAK_LEN: 2378 csid = MACSEC_CIPHER_ID_GCM_AES_256; 2379 break; 2380 default: 2381 goto cancel; 2382 } 2383 2384 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 2385 MACSEC_SECY_ATTR_PAD) || 2386 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 2387 csid, MACSEC_SECY_ATTR_PAD) || 2388 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 2389 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 2390 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 2391 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 2392 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 2393 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 2394 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 2395 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 2396 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 2397 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 2398 goto cancel; 2399 2400 if (secy->replay_protect) { 2401 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 2402 goto cancel; 2403 } 2404 2405 nla_nest_end(skb, secy_nest); 2406 return 0; 2407 2408 cancel: 2409 nla_nest_cancel(skb, secy_nest); 2410 return 1; 2411 } 2412 2413 static int dump_secy(struct macsec_secy *secy, struct net_device *dev, 2414 struct sk_buff *skb, struct netlink_callback *cb) 2415 { 2416 struct macsec_rx_sc *rx_sc; 2417 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2418 struct nlattr *txsa_list, *rxsc_list; 2419 int i, j; 2420 void *hdr; 2421 struct nlattr *attr; 2422 2423 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 2424 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 2425 if (!hdr) 2426 return -EMSGSIZE; 2427 2428 genl_dump_check_consistent(cb, hdr); 2429 2430 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 2431 goto nla_put_failure; 2432 2433 if (nla_put_secy(secy, skb)) 2434 goto nla_put_failure; 2435 2436 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS); 2437 if (!attr) 2438 goto nla_put_failure; 2439 if (copy_tx_sc_stats(skb, tx_sc->stats)) { 2440 nla_nest_cancel(skb, attr); 2441 goto nla_put_failure; 2442 } 2443 nla_nest_end(skb, attr); 2444 2445 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS); 2446 if (!attr) 2447 goto nla_put_failure; 2448 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) { 2449 nla_nest_cancel(skb, attr); 2450 goto nla_put_failure; 2451 } 2452 nla_nest_end(skb, attr); 2453 2454 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST); 2455 if (!txsa_list) 2456 goto nla_put_failure; 2457 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 2458 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 2459 struct nlattr *txsa_nest; 2460 2461 if (!tx_sa) 2462 continue; 2463 2464 txsa_nest = nla_nest_start(skb, j++); 2465 if (!txsa_nest) { 2466 nla_nest_cancel(skb, txsa_list); 2467 goto nla_put_failure; 2468 } 2469 2470 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2471 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) || 2472 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 2473 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 2474 nla_nest_cancel(skb, txsa_nest); 2475 nla_nest_cancel(skb, txsa_list); 2476 goto nla_put_failure; 2477 } 2478 2479 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS); 2480 if (!attr) { 2481 nla_nest_cancel(skb, txsa_nest); 2482 nla_nest_cancel(skb, txsa_list); 2483 goto nla_put_failure; 2484 } 2485 if (copy_tx_sa_stats(skb, tx_sa->stats)) { 2486 nla_nest_cancel(skb, attr); 2487 nla_nest_cancel(skb, txsa_nest); 2488 nla_nest_cancel(skb, txsa_list); 2489 goto nla_put_failure; 2490 } 2491 nla_nest_end(skb, attr); 2492 2493 nla_nest_end(skb, txsa_nest); 2494 } 2495 nla_nest_end(skb, txsa_list); 2496 2497 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST); 2498 if (!rxsc_list) 2499 goto nla_put_failure; 2500 2501 j = 1; 2502 for_each_rxsc_rtnl(secy, rx_sc) { 2503 int k; 2504 struct nlattr *rxsa_list; 2505 struct nlattr *rxsc_nest = nla_nest_start(skb, j++); 2506 2507 if (!rxsc_nest) { 2508 nla_nest_cancel(skb, rxsc_list); 2509 goto nla_put_failure; 2510 } 2511 2512 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 2513 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 2514 MACSEC_RXSC_ATTR_PAD)) { 2515 nla_nest_cancel(skb, rxsc_nest); 2516 nla_nest_cancel(skb, rxsc_list); 2517 goto nla_put_failure; 2518 } 2519 2520 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS); 2521 if (!attr) { 2522 nla_nest_cancel(skb, rxsc_nest); 2523 nla_nest_cancel(skb, rxsc_list); 2524 goto nla_put_failure; 2525 } 2526 if (copy_rx_sc_stats(skb, rx_sc->stats)) { 2527 nla_nest_cancel(skb, attr); 2528 nla_nest_cancel(skb, rxsc_nest); 2529 nla_nest_cancel(skb, rxsc_list); 2530 goto nla_put_failure; 2531 } 2532 nla_nest_end(skb, attr); 2533 2534 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST); 2535 if (!rxsa_list) { 2536 nla_nest_cancel(skb, rxsc_nest); 2537 nla_nest_cancel(skb, rxsc_list); 2538 goto nla_put_failure; 2539 } 2540 2541 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 2542 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 2543 struct nlattr *rxsa_nest; 2544 2545 if (!rx_sa) 2546 continue; 2547 2548 rxsa_nest = nla_nest_start(skb, k++); 2549 if (!rxsa_nest) { 2550 nla_nest_cancel(skb, rxsa_list); 2551 nla_nest_cancel(skb, rxsc_nest); 2552 nla_nest_cancel(skb, rxsc_list); 2553 goto nla_put_failure; 2554 } 2555 2556 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS); 2557 if (!attr) { 2558 nla_nest_cancel(skb, rxsa_list); 2559 nla_nest_cancel(skb, rxsc_nest); 2560 nla_nest_cancel(skb, rxsc_list); 2561 goto nla_put_failure; 2562 } 2563 if (copy_rx_sa_stats(skb, rx_sa->stats)) { 2564 nla_nest_cancel(skb, attr); 2565 nla_nest_cancel(skb, rxsa_list); 2566 nla_nest_cancel(skb, rxsc_nest); 2567 nla_nest_cancel(skb, rxsc_list); 2568 goto nla_put_failure; 2569 } 2570 nla_nest_end(skb, attr); 2571 2572 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2573 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) || 2574 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 2575 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 2576 nla_nest_cancel(skb, rxsa_nest); 2577 nla_nest_cancel(skb, rxsc_nest); 2578 nla_nest_cancel(skb, rxsc_list); 2579 goto nla_put_failure; 2580 } 2581 nla_nest_end(skb, rxsa_nest); 2582 } 2583 2584 nla_nest_end(skb, rxsa_list); 2585 nla_nest_end(skb, rxsc_nest); 2586 } 2587 2588 nla_nest_end(skb, rxsc_list); 2589 2590 genlmsg_end(skb, hdr); 2591 2592 return 0; 2593 2594 nla_put_failure: 2595 genlmsg_cancel(skb, hdr); 2596 return -EMSGSIZE; 2597 } 2598 2599 static int macsec_generation = 1; /* protected by RTNL */ 2600 2601 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 2602 { 2603 struct net *net = sock_net(skb->sk); 2604 struct net_device *dev; 2605 int dev_idx, d; 2606 2607 dev_idx = cb->args[0]; 2608 2609 d = 0; 2610 rtnl_lock(); 2611 2612 cb->seq = macsec_generation; 2613 2614 for_each_netdev(net, dev) { 2615 struct macsec_secy *secy; 2616 2617 if (d < dev_idx) 2618 goto next; 2619 2620 if (!netif_is_macsec(dev)) 2621 goto next; 2622 2623 secy = &macsec_priv(dev)->secy; 2624 if (dump_secy(secy, dev, skb, cb) < 0) 2625 goto done; 2626 next: 2627 d++; 2628 } 2629 2630 done: 2631 rtnl_unlock(); 2632 cb->args[0] = d; 2633 return skb->len; 2634 } 2635 2636 static const struct genl_ops macsec_genl_ops[] = { 2637 { 2638 .cmd = MACSEC_CMD_GET_TXSC, 2639 .dumpit = macsec_dump_txsc, 2640 .policy = macsec_genl_policy, 2641 }, 2642 { 2643 .cmd = MACSEC_CMD_ADD_RXSC, 2644 .doit = macsec_add_rxsc, 2645 .policy = macsec_genl_policy, 2646 .flags = GENL_ADMIN_PERM, 2647 }, 2648 { 2649 .cmd = MACSEC_CMD_DEL_RXSC, 2650 .doit = macsec_del_rxsc, 2651 .policy = macsec_genl_policy, 2652 .flags = GENL_ADMIN_PERM, 2653 }, 2654 { 2655 .cmd = MACSEC_CMD_UPD_RXSC, 2656 .doit = macsec_upd_rxsc, 2657 .policy = macsec_genl_policy, 2658 .flags = GENL_ADMIN_PERM, 2659 }, 2660 { 2661 .cmd = MACSEC_CMD_ADD_TXSA, 2662 .doit = macsec_add_txsa, 2663 .policy = macsec_genl_policy, 2664 .flags = GENL_ADMIN_PERM, 2665 }, 2666 { 2667 .cmd = MACSEC_CMD_DEL_TXSA, 2668 .doit = macsec_del_txsa, 2669 .policy = macsec_genl_policy, 2670 .flags = GENL_ADMIN_PERM, 2671 }, 2672 { 2673 .cmd = MACSEC_CMD_UPD_TXSA, 2674 .doit = macsec_upd_txsa, 2675 .policy = macsec_genl_policy, 2676 .flags = GENL_ADMIN_PERM, 2677 }, 2678 { 2679 .cmd = MACSEC_CMD_ADD_RXSA, 2680 .doit = macsec_add_rxsa, 2681 .policy = macsec_genl_policy, 2682 .flags = GENL_ADMIN_PERM, 2683 }, 2684 { 2685 .cmd = MACSEC_CMD_DEL_RXSA, 2686 .doit = macsec_del_rxsa, 2687 .policy = macsec_genl_policy, 2688 .flags = GENL_ADMIN_PERM, 2689 }, 2690 { 2691 .cmd = MACSEC_CMD_UPD_RXSA, 2692 .doit = macsec_upd_rxsa, 2693 .policy = macsec_genl_policy, 2694 .flags = GENL_ADMIN_PERM, 2695 }, 2696 }; 2697 2698 static struct genl_family macsec_fam __ro_after_init = { 2699 .name = MACSEC_GENL_NAME, 2700 .hdrsize = 0, 2701 .version = MACSEC_GENL_VERSION, 2702 .maxattr = MACSEC_ATTR_MAX, 2703 .netnsok = true, 2704 .module = THIS_MODULE, 2705 .ops = macsec_genl_ops, 2706 .n_ops = ARRAY_SIZE(macsec_genl_ops), 2707 }; 2708 2709 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 2710 struct net_device *dev) 2711 { 2712 struct macsec_dev *macsec = netdev_priv(dev); 2713 struct macsec_secy *secy = &macsec->secy; 2714 struct pcpu_secy_stats *secy_stats; 2715 int ret, len; 2716 2717 /* 10.5 */ 2718 if (!secy->protect_frames) { 2719 secy_stats = this_cpu_ptr(macsec->stats); 2720 u64_stats_update_begin(&secy_stats->syncp); 2721 secy_stats->stats.OutPktsUntagged++; 2722 u64_stats_update_end(&secy_stats->syncp); 2723 skb->dev = macsec->real_dev; 2724 len = skb->len; 2725 ret = dev_queue_xmit(skb); 2726 count_tx(dev, ret, len); 2727 return ret; 2728 } 2729 2730 if (!secy->operational) { 2731 kfree_skb(skb); 2732 dev->stats.tx_dropped++; 2733 return NETDEV_TX_OK; 2734 } 2735 2736 skb = macsec_encrypt(skb, dev); 2737 if (IS_ERR(skb)) { 2738 if (PTR_ERR(skb) != -EINPROGRESS) 2739 dev->stats.tx_dropped++; 2740 return NETDEV_TX_OK; 2741 } 2742 2743 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 2744 2745 macsec_encrypt_finish(skb, dev); 2746 len = skb->len; 2747 ret = dev_queue_xmit(skb); 2748 count_tx(dev, ret, len); 2749 return ret; 2750 } 2751 2752 #define MACSEC_FEATURES \ 2753 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 2754 static struct lock_class_key macsec_netdev_addr_lock_key; 2755 2756 static int macsec_dev_init(struct net_device *dev) 2757 { 2758 struct macsec_dev *macsec = macsec_priv(dev); 2759 struct net_device *real_dev = macsec->real_dev; 2760 int err; 2761 2762 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2763 if (!dev->tstats) 2764 return -ENOMEM; 2765 2766 err = gro_cells_init(&macsec->gro_cells, dev); 2767 if (err) { 2768 free_percpu(dev->tstats); 2769 return err; 2770 } 2771 2772 dev->features = real_dev->features & MACSEC_FEATURES; 2773 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 2774 2775 dev->needed_headroom = real_dev->needed_headroom + 2776 MACSEC_NEEDED_HEADROOM; 2777 dev->needed_tailroom = real_dev->needed_tailroom + 2778 MACSEC_NEEDED_TAILROOM; 2779 2780 if (is_zero_ether_addr(dev->dev_addr)) 2781 eth_hw_addr_inherit(dev, real_dev); 2782 if (is_zero_ether_addr(dev->broadcast)) 2783 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 2784 2785 return 0; 2786 } 2787 2788 static void macsec_dev_uninit(struct net_device *dev) 2789 { 2790 struct macsec_dev *macsec = macsec_priv(dev); 2791 2792 gro_cells_destroy(&macsec->gro_cells); 2793 free_percpu(dev->tstats); 2794 } 2795 2796 static netdev_features_t macsec_fix_features(struct net_device *dev, 2797 netdev_features_t features) 2798 { 2799 struct macsec_dev *macsec = macsec_priv(dev); 2800 struct net_device *real_dev = macsec->real_dev; 2801 2802 features &= (real_dev->features & MACSEC_FEATURES) | 2803 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 2804 features |= NETIF_F_LLTX; 2805 2806 return features; 2807 } 2808 2809 static int macsec_dev_open(struct net_device *dev) 2810 { 2811 struct macsec_dev *macsec = macsec_priv(dev); 2812 struct net_device *real_dev = macsec->real_dev; 2813 int err; 2814 2815 if (!(real_dev->flags & IFF_UP)) 2816 return -ENETDOWN; 2817 2818 err = dev_uc_add(real_dev, dev->dev_addr); 2819 if (err < 0) 2820 return err; 2821 2822 if (dev->flags & IFF_ALLMULTI) { 2823 err = dev_set_allmulti(real_dev, 1); 2824 if (err < 0) 2825 goto del_unicast; 2826 } 2827 2828 if (dev->flags & IFF_PROMISC) { 2829 err = dev_set_promiscuity(real_dev, 1); 2830 if (err < 0) 2831 goto clear_allmulti; 2832 } 2833 2834 if (netif_carrier_ok(real_dev)) 2835 netif_carrier_on(dev); 2836 2837 return 0; 2838 clear_allmulti: 2839 if (dev->flags & IFF_ALLMULTI) 2840 dev_set_allmulti(real_dev, -1); 2841 del_unicast: 2842 dev_uc_del(real_dev, dev->dev_addr); 2843 netif_carrier_off(dev); 2844 return err; 2845 } 2846 2847 static int macsec_dev_stop(struct net_device *dev) 2848 { 2849 struct macsec_dev *macsec = macsec_priv(dev); 2850 struct net_device *real_dev = macsec->real_dev; 2851 2852 netif_carrier_off(dev); 2853 2854 dev_mc_unsync(real_dev, dev); 2855 dev_uc_unsync(real_dev, dev); 2856 2857 if (dev->flags & IFF_ALLMULTI) 2858 dev_set_allmulti(real_dev, -1); 2859 2860 if (dev->flags & IFF_PROMISC) 2861 dev_set_promiscuity(real_dev, -1); 2862 2863 dev_uc_del(real_dev, dev->dev_addr); 2864 2865 return 0; 2866 } 2867 2868 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 2869 { 2870 struct net_device *real_dev = macsec_priv(dev)->real_dev; 2871 2872 if (!(dev->flags & IFF_UP)) 2873 return; 2874 2875 if (change & IFF_ALLMULTI) 2876 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 2877 2878 if (change & IFF_PROMISC) 2879 dev_set_promiscuity(real_dev, 2880 dev->flags & IFF_PROMISC ? 1 : -1); 2881 } 2882 2883 static void macsec_dev_set_rx_mode(struct net_device *dev) 2884 { 2885 struct net_device *real_dev = macsec_priv(dev)->real_dev; 2886 2887 dev_mc_sync(real_dev, dev); 2888 dev_uc_sync(real_dev, dev); 2889 } 2890 2891 static int macsec_set_mac_address(struct net_device *dev, void *p) 2892 { 2893 struct macsec_dev *macsec = macsec_priv(dev); 2894 struct net_device *real_dev = macsec->real_dev; 2895 struct sockaddr *addr = p; 2896 int err; 2897 2898 if (!is_valid_ether_addr(addr->sa_data)) 2899 return -EADDRNOTAVAIL; 2900 2901 if (!(dev->flags & IFF_UP)) 2902 goto out; 2903 2904 err = dev_uc_add(real_dev, addr->sa_data); 2905 if (err < 0) 2906 return err; 2907 2908 dev_uc_del(real_dev, dev->dev_addr); 2909 2910 out: 2911 ether_addr_copy(dev->dev_addr, addr->sa_data); 2912 return 0; 2913 } 2914 2915 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 2916 { 2917 struct macsec_dev *macsec = macsec_priv(dev); 2918 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 2919 2920 if (macsec->real_dev->mtu - extra < new_mtu) 2921 return -ERANGE; 2922 2923 dev->mtu = new_mtu; 2924 2925 return 0; 2926 } 2927 2928 static void macsec_get_stats64(struct net_device *dev, 2929 struct rtnl_link_stats64 *s) 2930 { 2931 int cpu; 2932 2933 if (!dev->tstats) 2934 return; 2935 2936 for_each_possible_cpu(cpu) { 2937 struct pcpu_sw_netstats *stats; 2938 struct pcpu_sw_netstats tmp; 2939 int start; 2940 2941 stats = per_cpu_ptr(dev->tstats, cpu); 2942 do { 2943 start = u64_stats_fetch_begin_irq(&stats->syncp); 2944 tmp.rx_packets = stats->rx_packets; 2945 tmp.rx_bytes = stats->rx_bytes; 2946 tmp.tx_packets = stats->tx_packets; 2947 tmp.tx_bytes = stats->tx_bytes; 2948 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2949 2950 s->rx_packets += tmp.rx_packets; 2951 s->rx_bytes += tmp.rx_bytes; 2952 s->tx_packets += tmp.tx_packets; 2953 s->tx_bytes += tmp.tx_bytes; 2954 } 2955 2956 s->rx_dropped = dev->stats.rx_dropped; 2957 s->tx_dropped = dev->stats.tx_dropped; 2958 } 2959 2960 static int macsec_get_iflink(const struct net_device *dev) 2961 { 2962 return macsec_priv(dev)->real_dev->ifindex; 2963 } 2964 2965 2966 static int macsec_get_nest_level(struct net_device *dev) 2967 { 2968 return macsec_priv(dev)->nest_level; 2969 } 2970 2971 2972 static const struct net_device_ops macsec_netdev_ops = { 2973 .ndo_init = macsec_dev_init, 2974 .ndo_uninit = macsec_dev_uninit, 2975 .ndo_open = macsec_dev_open, 2976 .ndo_stop = macsec_dev_stop, 2977 .ndo_fix_features = macsec_fix_features, 2978 .ndo_change_mtu = macsec_change_mtu, 2979 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 2980 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 2981 .ndo_set_mac_address = macsec_set_mac_address, 2982 .ndo_start_xmit = macsec_start_xmit, 2983 .ndo_get_stats64 = macsec_get_stats64, 2984 .ndo_get_iflink = macsec_get_iflink, 2985 .ndo_get_lock_subclass = macsec_get_nest_level, 2986 }; 2987 2988 static const struct device_type macsec_type = { 2989 .name = "macsec", 2990 }; 2991 2992 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 2993 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 2994 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 2995 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 2996 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 2997 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 2998 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 2999 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 3000 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 3001 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 3002 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 3003 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 3004 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 3005 }; 3006 3007 static void macsec_free_netdev(struct net_device *dev) 3008 { 3009 struct macsec_dev *macsec = macsec_priv(dev); 3010 struct net_device *real_dev = macsec->real_dev; 3011 3012 free_percpu(macsec->stats); 3013 free_percpu(macsec->secy.tx_sc.stats); 3014 3015 dev_put(real_dev); 3016 } 3017 3018 static void macsec_setup(struct net_device *dev) 3019 { 3020 ether_setup(dev); 3021 dev->min_mtu = 0; 3022 dev->max_mtu = ETH_MAX_MTU; 3023 dev->priv_flags |= IFF_NO_QUEUE; 3024 dev->netdev_ops = &macsec_netdev_ops; 3025 dev->needs_free_netdev = true; 3026 dev->priv_destructor = macsec_free_netdev; 3027 SET_NETDEV_DEVTYPE(dev, &macsec_type); 3028 3029 eth_zero_addr(dev->broadcast); 3030 } 3031 3032 static int macsec_changelink_common(struct net_device *dev, 3033 struct nlattr *data[]) 3034 { 3035 struct macsec_secy *secy; 3036 struct macsec_tx_sc *tx_sc; 3037 3038 secy = &macsec_priv(dev)->secy; 3039 tx_sc = &secy->tx_sc; 3040 3041 if (data[IFLA_MACSEC_ENCODING_SA]) { 3042 struct macsec_tx_sa *tx_sa; 3043 3044 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3045 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 3046 3047 secy->operational = tx_sa && tx_sa->active; 3048 } 3049 3050 if (data[IFLA_MACSEC_WINDOW]) 3051 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3052 3053 if (data[IFLA_MACSEC_ENCRYPT]) 3054 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3055 3056 if (data[IFLA_MACSEC_PROTECT]) 3057 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3058 3059 if (data[IFLA_MACSEC_INC_SCI]) 3060 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3061 3062 if (data[IFLA_MACSEC_ES]) 3063 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3064 3065 if (data[IFLA_MACSEC_SCB]) 3066 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3067 3068 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3069 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3070 3071 if (data[IFLA_MACSEC_VALIDATION]) 3072 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3073 3074 if (data[IFLA_MACSEC_CIPHER_SUITE]) { 3075 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) { 3076 case MACSEC_CIPHER_ID_GCM_AES_128: 3077 case MACSEC_DEFAULT_CIPHER_ID: 3078 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3079 break; 3080 case MACSEC_CIPHER_ID_GCM_AES_256: 3081 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3082 break; 3083 default: 3084 return -EINVAL; 3085 } 3086 } 3087 3088 return 0; 3089 } 3090 3091 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3092 struct nlattr *data[], 3093 struct netlink_ext_ack *extack) 3094 { 3095 if (!data) 3096 return 0; 3097 3098 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3099 data[IFLA_MACSEC_ICV_LEN] || 3100 data[IFLA_MACSEC_SCI] || 3101 data[IFLA_MACSEC_PORT]) 3102 return -EINVAL; 3103 3104 return macsec_changelink_common(dev, data); 3105 } 3106 3107 static void macsec_del_dev(struct macsec_dev *macsec) 3108 { 3109 int i; 3110 3111 while (macsec->secy.rx_sc) { 3112 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 3113 3114 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 3115 free_rx_sc(rx_sc); 3116 } 3117 3118 for (i = 0; i < MACSEC_NUM_AN; i++) { 3119 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 3120 3121 if (sa) { 3122 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 3123 clear_tx_sa(sa); 3124 } 3125 } 3126 } 3127 3128 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 3129 { 3130 struct macsec_dev *macsec = macsec_priv(dev); 3131 struct net_device *real_dev = macsec->real_dev; 3132 3133 unregister_netdevice_queue(dev, head); 3134 list_del_rcu(&macsec->secys); 3135 macsec_del_dev(macsec); 3136 netdev_upper_dev_unlink(real_dev, dev); 3137 3138 macsec_generation++; 3139 } 3140 3141 static void macsec_dellink(struct net_device *dev, struct list_head *head) 3142 { 3143 struct macsec_dev *macsec = macsec_priv(dev); 3144 struct net_device *real_dev = macsec->real_dev; 3145 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3146 3147 macsec_common_dellink(dev, head); 3148 3149 if (list_empty(&rxd->secys)) { 3150 netdev_rx_handler_unregister(real_dev); 3151 kfree(rxd); 3152 } 3153 } 3154 3155 static int register_macsec_dev(struct net_device *real_dev, 3156 struct net_device *dev) 3157 { 3158 struct macsec_dev *macsec = macsec_priv(dev); 3159 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3160 3161 if (!rxd) { 3162 int err; 3163 3164 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 3165 if (!rxd) 3166 return -ENOMEM; 3167 3168 INIT_LIST_HEAD(&rxd->secys); 3169 3170 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 3171 rxd); 3172 if (err < 0) { 3173 kfree(rxd); 3174 return err; 3175 } 3176 } 3177 3178 list_add_tail_rcu(&macsec->secys, &rxd->secys); 3179 return 0; 3180 } 3181 3182 static bool sci_exists(struct net_device *dev, sci_t sci) 3183 { 3184 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 3185 struct macsec_dev *macsec; 3186 3187 list_for_each_entry(macsec, &rxd->secys, secys) { 3188 if (macsec->secy.sci == sci) 3189 return true; 3190 } 3191 3192 return false; 3193 } 3194 3195 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 3196 { 3197 return make_sci(dev->dev_addr, port); 3198 } 3199 3200 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 3201 { 3202 struct macsec_dev *macsec = macsec_priv(dev); 3203 struct macsec_secy *secy = &macsec->secy; 3204 3205 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 3206 if (!macsec->stats) 3207 return -ENOMEM; 3208 3209 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 3210 if (!secy->tx_sc.stats) { 3211 free_percpu(macsec->stats); 3212 return -ENOMEM; 3213 } 3214 3215 if (sci == MACSEC_UNDEF_SCI) 3216 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3217 3218 secy->netdev = dev; 3219 secy->operational = true; 3220 secy->key_len = DEFAULT_SAK_LEN; 3221 secy->icv_len = icv_len; 3222 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 3223 secy->protect_frames = true; 3224 secy->replay_protect = false; 3225 3226 secy->sci = sci; 3227 secy->tx_sc.active = true; 3228 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 3229 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 3230 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 3231 secy->tx_sc.end_station = false; 3232 secy->tx_sc.scb = false; 3233 3234 return 0; 3235 } 3236 3237 static int macsec_newlink(struct net *net, struct net_device *dev, 3238 struct nlattr *tb[], struct nlattr *data[], 3239 struct netlink_ext_ack *extack) 3240 { 3241 struct macsec_dev *macsec = macsec_priv(dev); 3242 struct net_device *real_dev; 3243 int err; 3244 sci_t sci; 3245 u8 icv_len = DEFAULT_ICV_LEN; 3246 rx_handler_func_t *rx_handler; 3247 3248 if (!tb[IFLA_LINK]) 3249 return -EINVAL; 3250 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 3251 if (!real_dev) 3252 return -ENODEV; 3253 3254 dev->priv_flags |= IFF_MACSEC; 3255 3256 macsec->real_dev = real_dev; 3257 3258 if (data && data[IFLA_MACSEC_ICV_LEN]) 3259 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3260 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 3261 3262 rx_handler = rtnl_dereference(real_dev->rx_handler); 3263 if (rx_handler && rx_handler != macsec_handle_frame) 3264 return -EBUSY; 3265 3266 err = register_netdevice(dev); 3267 if (err < 0) 3268 return err; 3269 3270 dev_hold(real_dev); 3271 3272 macsec->nest_level = dev_get_nest_level(real_dev) + 1; 3273 netdev_lockdep_set_classes(dev); 3274 lockdep_set_class_and_subclass(&dev->addr_list_lock, 3275 &macsec_netdev_addr_lock_key, 3276 macsec_get_nest_level(dev)); 3277 3278 err = netdev_upper_dev_link(real_dev, dev, extack); 3279 if (err < 0) 3280 goto put_dev; 3281 3282 /* need to be already registered so that ->init has run and 3283 * the MAC addr is set 3284 */ 3285 if (data && data[IFLA_MACSEC_SCI]) 3286 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 3287 else if (data && data[IFLA_MACSEC_PORT]) 3288 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 3289 else 3290 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3291 3292 if (rx_handler && sci_exists(real_dev, sci)) { 3293 err = -EBUSY; 3294 goto unlink; 3295 } 3296 3297 err = macsec_add_dev(dev, sci, icv_len); 3298 if (err) 3299 goto unlink; 3300 3301 if (data) { 3302 err = macsec_changelink_common(dev, data); 3303 if (err) 3304 goto del_dev; 3305 } 3306 3307 err = register_macsec_dev(real_dev, dev); 3308 if (err < 0) 3309 goto del_dev; 3310 3311 macsec_generation++; 3312 3313 return 0; 3314 3315 del_dev: 3316 macsec_del_dev(macsec); 3317 unlink: 3318 netdev_upper_dev_unlink(real_dev, dev); 3319 put_dev: 3320 dev_put(real_dev); 3321 unregister_netdevice(dev); 3322 return err; 3323 } 3324 3325 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], 3326 struct netlink_ext_ack *extack) 3327 { 3328 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 3329 u8 icv_len = DEFAULT_ICV_LEN; 3330 int flag; 3331 bool es, scb, sci; 3332 3333 if (!data) 3334 return 0; 3335 3336 if (data[IFLA_MACSEC_CIPHER_SUITE]) 3337 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 3338 3339 if (data[IFLA_MACSEC_ICV_LEN]) { 3340 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3341 if (icv_len != DEFAULT_ICV_LEN) { 3342 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 3343 struct crypto_aead *dummy_tfm; 3344 3345 dummy_tfm = macsec_alloc_tfm(dummy_key, 3346 DEFAULT_SAK_LEN, 3347 icv_len); 3348 if (IS_ERR(dummy_tfm)) 3349 return PTR_ERR(dummy_tfm); 3350 crypto_free_aead(dummy_tfm); 3351 } 3352 } 3353 3354 switch (csid) { 3355 case MACSEC_CIPHER_ID_GCM_AES_128: 3356 case MACSEC_CIPHER_ID_GCM_AES_256: 3357 case MACSEC_DEFAULT_CIPHER_ID: 3358 if (icv_len < MACSEC_MIN_ICV_LEN || 3359 icv_len > MACSEC_STD_ICV_LEN) 3360 return -EINVAL; 3361 break; 3362 default: 3363 return -EINVAL; 3364 } 3365 3366 if (data[IFLA_MACSEC_ENCODING_SA]) { 3367 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 3368 return -EINVAL; 3369 } 3370 3371 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 3372 flag < IFLA_MACSEC_VALIDATION; 3373 flag++) { 3374 if (data[flag]) { 3375 if (nla_get_u8(data[flag]) > 1) 3376 return -EINVAL; 3377 } 3378 } 3379 3380 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 3381 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 3382 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 3383 3384 if ((sci && (scb || es)) || (scb && es)) 3385 return -EINVAL; 3386 3387 if (data[IFLA_MACSEC_VALIDATION] && 3388 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 3389 return -EINVAL; 3390 3391 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 3392 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 3393 !data[IFLA_MACSEC_WINDOW]) 3394 return -EINVAL; 3395 3396 return 0; 3397 } 3398 3399 static struct net *macsec_get_link_net(const struct net_device *dev) 3400 { 3401 return dev_net(macsec_priv(dev)->real_dev); 3402 } 3403 3404 static size_t macsec_get_size(const struct net_device *dev) 3405 { 3406 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ 3407 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ 3408 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ 3409 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ 3410 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ 3411 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ 3412 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ 3413 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ 3414 nla_total_size(1) + /* IFLA_MACSEC_ES */ 3415 nla_total_size(1) + /* IFLA_MACSEC_SCB */ 3416 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ 3417 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ 3418 0; 3419 } 3420 3421 static int macsec_fill_info(struct sk_buff *skb, 3422 const struct net_device *dev) 3423 { 3424 struct macsec_secy *secy = &macsec_priv(dev)->secy; 3425 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3426 u64 csid; 3427 3428 switch (secy->key_len) { 3429 case MACSEC_GCM_AES_128_SAK_LEN: 3430 csid = MACSEC_DEFAULT_CIPHER_ID; 3431 break; 3432 case MACSEC_GCM_AES_256_SAK_LEN: 3433 csid = MACSEC_CIPHER_ID_GCM_AES_256; 3434 break; 3435 default: 3436 goto nla_put_failure; 3437 } 3438 3439 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 3440 IFLA_MACSEC_PAD) || 3441 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 3442 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 3443 csid, IFLA_MACSEC_PAD) || 3444 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 3445 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 3446 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 3447 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 3448 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 3449 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 3450 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 3451 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 3452 0) 3453 goto nla_put_failure; 3454 3455 if (secy->replay_protect) { 3456 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 3457 goto nla_put_failure; 3458 } 3459 3460 return 0; 3461 3462 nla_put_failure: 3463 return -EMSGSIZE; 3464 } 3465 3466 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 3467 .kind = "macsec", 3468 .priv_size = sizeof(struct macsec_dev), 3469 .maxtype = IFLA_MACSEC_MAX, 3470 .policy = macsec_rtnl_policy, 3471 .setup = macsec_setup, 3472 .validate = macsec_validate_attr, 3473 .newlink = macsec_newlink, 3474 .changelink = macsec_changelink, 3475 .dellink = macsec_dellink, 3476 .get_size = macsec_get_size, 3477 .fill_info = macsec_fill_info, 3478 .get_link_net = macsec_get_link_net, 3479 }; 3480 3481 static bool is_macsec_master(struct net_device *dev) 3482 { 3483 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 3484 } 3485 3486 static int macsec_notify(struct notifier_block *this, unsigned long event, 3487 void *ptr) 3488 { 3489 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 3490 LIST_HEAD(head); 3491 3492 if (!is_macsec_master(real_dev)) 3493 return NOTIFY_DONE; 3494 3495 switch (event) { 3496 case NETDEV_UNREGISTER: { 3497 struct macsec_dev *m, *n; 3498 struct macsec_rxh_data *rxd; 3499 3500 rxd = macsec_data_rtnl(real_dev); 3501 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 3502 macsec_common_dellink(m->secy.netdev, &head); 3503 } 3504 3505 netdev_rx_handler_unregister(real_dev); 3506 kfree(rxd); 3507 3508 unregister_netdevice_many(&head); 3509 break; 3510 } 3511 case NETDEV_CHANGEMTU: { 3512 struct macsec_dev *m; 3513 struct macsec_rxh_data *rxd; 3514 3515 rxd = macsec_data_rtnl(real_dev); 3516 list_for_each_entry(m, &rxd->secys, secys) { 3517 struct net_device *dev = m->secy.netdev; 3518 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 3519 macsec_extra_len(true)); 3520 3521 if (dev->mtu > mtu) 3522 dev_set_mtu(dev, mtu); 3523 } 3524 } 3525 } 3526 3527 return NOTIFY_OK; 3528 } 3529 3530 static struct notifier_block macsec_notifier = { 3531 .notifier_call = macsec_notify, 3532 }; 3533 3534 static int __init macsec_init(void) 3535 { 3536 int err; 3537 3538 pr_info("MACsec IEEE 802.1AE\n"); 3539 err = register_netdevice_notifier(&macsec_notifier); 3540 if (err) 3541 return err; 3542 3543 err = rtnl_link_register(&macsec_link_ops); 3544 if (err) 3545 goto notifier; 3546 3547 err = genl_register_family(&macsec_fam); 3548 if (err) 3549 goto rtnl; 3550 3551 return 0; 3552 3553 rtnl: 3554 rtnl_link_unregister(&macsec_link_ops); 3555 notifier: 3556 unregister_netdevice_notifier(&macsec_notifier); 3557 return err; 3558 } 3559 3560 static void __exit macsec_exit(void) 3561 { 3562 genl_unregister_family(&macsec_fam); 3563 rtnl_link_unregister(&macsec_link_ops); 3564 unregister_netdevice_notifier(&macsec_notifier); 3565 rcu_barrier(); 3566 } 3567 3568 module_init(macsec_init); 3569 module_exit(macsec_exit); 3570 3571 MODULE_ALIAS_RTNL_LINK("macsec"); 3572 MODULE_ALIAS_GENL_FAMILY("macsec"); 3573 3574 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 3575 MODULE_LICENSE("GPL v2"); 3576