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