1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * drivers/net/macsec.c - MACsec device 4 * 5 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net> 6 */ 7 8 #include <linux/types.h> 9 #include <linux/skbuff.h> 10 #include <linux/socket.h> 11 #include <linux/module.h> 12 #include <crypto/aead.h> 13 #include <linux/etherdevice.h> 14 #include <linux/rtnetlink.h> 15 #include <linux/refcount.h> 16 #include <net/genetlink.h> 17 #include <net/sock.h> 18 #include <net/gro_cells.h> 19 20 #include <uapi/linux/if_macsec.h> 21 22 typedef u64 __bitwise sci_t; 23 24 #define MACSEC_SCI_LEN 8 25 26 /* SecTAG length = macsec_eth_header without the optional SCI */ 27 #define MACSEC_TAG_LEN 6 28 29 struct macsec_eth_header { 30 struct ethhdr eth; 31 /* SecTAG */ 32 u8 tci_an; 33 #if defined(__LITTLE_ENDIAN_BITFIELD) 34 u8 short_length:6, 35 unused:2; 36 #elif defined(__BIG_ENDIAN_BITFIELD) 37 u8 unused:2, 38 short_length:6; 39 #else 40 #error "Please fix <asm/byteorder.h>" 41 #endif 42 __be32 packet_number; 43 u8 secure_channel_id[8]; /* optional */ 44 } __packed; 45 46 #define MACSEC_TCI_VERSION 0x80 47 #define MACSEC_TCI_ES 0x40 /* end station */ 48 #define MACSEC_TCI_SC 0x20 /* SCI present */ 49 #define MACSEC_TCI_SCB 0x10 /* epon */ 50 #define MACSEC_TCI_E 0x08 /* encryption */ 51 #define MACSEC_TCI_C 0x04 /* changed text */ 52 #define MACSEC_AN_MASK 0x03 /* association number */ 53 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C) 54 55 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */ 56 #define MIN_NON_SHORT_LEN 48 57 58 #define GCM_AES_IV_LEN 12 59 #define DEFAULT_ICV_LEN 16 60 61 #define MACSEC_NUM_AN 4 /* 2 bits for the association number */ 62 63 #define for_each_rxsc(secy, sc) \ 64 for (sc = rcu_dereference_bh(secy->rx_sc); \ 65 sc; \ 66 sc = rcu_dereference_bh(sc->next)) 67 #define for_each_rxsc_rtnl(secy, sc) \ 68 for (sc = rtnl_dereference(secy->rx_sc); \ 69 sc; \ 70 sc = rtnl_dereference(sc->next)) 71 72 struct gcm_iv { 73 union { 74 u8 secure_channel_id[8]; 75 sci_t sci; 76 }; 77 __be32 pn; 78 }; 79 80 /** 81 * struct macsec_key - SA key 82 * @id: user-provided key identifier 83 * @tfm: crypto struct, key storage 84 */ 85 struct macsec_key { 86 u8 id[MACSEC_KEYID_LEN]; 87 struct crypto_aead *tfm; 88 }; 89 90 struct macsec_rx_sc_stats { 91 __u64 InOctetsValidated; 92 __u64 InOctetsDecrypted; 93 __u64 InPktsUnchecked; 94 __u64 InPktsDelayed; 95 __u64 InPktsOK; 96 __u64 InPktsInvalid; 97 __u64 InPktsLate; 98 __u64 InPktsNotValid; 99 __u64 InPktsNotUsingSA; 100 __u64 InPktsUnusedSA; 101 }; 102 103 struct macsec_rx_sa_stats { 104 __u32 InPktsOK; 105 __u32 InPktsInvalid; 106 __u32 InPktsNotValid; 107 __u32 InPktsNotUsingSA; 108 __u32 InPktsUnusedSA; 109 }; 110 111 struct macsec_tx_sa_stats { 112 __u32 OutPktsProtected; 113 __u32 OutPktsEncrypted; 114 }; 115 116 struct macsec_tx_sc_stats { 117 __u64 OutPktsProtected; 118 __u64 OutPktsEncrypted; 119 __u64 OutOctetsProtected; 120 __u64 OutOctetsEncrypted; 121 }; 122 123 struct macsec_dev_stats { 124 __u64 OutPktsUntagged; 125 __u64 InPktsUntagged; 126 __u64 OutPktsTooLong; 127 __u64 InPktsNoTag; 128 __u64 InPktsBadTag; 129 __u64 InPktsUnknownSCI; 130 __u64 InPktsNoSCI; 131 __u64 InPktsOverrun; 132 }; 133 134 /** 135 * struct macsec_rx_sa - receive secure association 136 * @active: 137 * @next_pn: packet number expected for the next packet 138 * @lock: protects next_pn manipulations 139 * @key: key structure 140 * @stats: per-SA stats 141 */ 142 struct macsec_rx_sa { 143 struct macsec_key key; 144 spinlock_t lock; 145 u32 next_pn; 146 refcount_t refcnt; 147 bool active; 148 struct macsec_rx_sa_stats __percpu *stats; 149 struct macsec_rx_sc *sc; 150 struct rcu_head rcu; 151 }; 152 153 struct pcpu_rx_sc_stats { 154 struct macsec_rx_sc_stats stats; 155 struct u64_stats_sync syncp; 156 }; 157 158 /** 159 * struct macsec_rx_sc - receive secure channel 160 * @sci: secure channel identifier for this SC 161 * @active: channel is active 162 * @sa: array of secure associations 163 * @stats: per-SC stats 164 */ 165 struct macsec_rx_sc { 166 struct macsec_rx_sc __rcu *next; 167 sci_t sci; 168 bool active; 169 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN]; 170 struct pcpu_rx_sc_stats __percpu *stats; 171 refcount_t refcnt; 172 struct rcu_head rcu_head; 173 }; 174 175 /** 176 * struct macsec_tx_sa - transmit secure association 177 * @active: 178 * @next_pn: packet number to use for the next packet 179 * @lock: protects next_pn manipulations 180 * @key: key structure 181 * @stats: per-SA stats 182 */ 183 struct macsec_tx_sa { 184 struct macsec_key key; 185 spinlock_t lock; 186 u32 next_pn; 187 refcount_t refcnt; 188 bool active; 189 struct macsec_tx_sa_stats __percpu *stats; 190 struct rcu_head rcu; 191 }; 192 193 struct pcpu_tx_sc_stats { 194 struct macsec_tx_sc_stats stats; 195 struct u64_stats_sync syncp; 196 }; 197 198 /** 199 * struct macsec_tx_sc - transmit secure channel 200 * @active: 201 * @encoding_sa: association number of the SA currently in use 202 * @encrypt: encrypt packets on transmit, or authenticate only 203 * @send_sci: always include the SCI in the SecTAG 204 * @end_station: 205 * @scb: single copy broadcast flag 206 * @sa: array of secure associations 207 * @stats: stats for this TXSC 208 */ 209 struct macsec_tx_sc { 210 bool active; 211 u8 encoding_sa; 212 bool encrypt; 213 bool send_sci; 214 bool end_station; 215 bool scb; 216 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN]; 217 struct pcpu_tx_sc_stats __percpu *stats; 218 }; 219 220 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT 221 222 /** 223 * struct macsec_secy - MACsec Security Entity 224 * @netdev: netdevice for this SecY 225 * @n_rx_sc: number of receive secure channels configured on this SecY 226 * @sci: secure channel identifier used for tx 227 * @key_len: length of keys used by the cipher suite 228 * @icv_len: length of ICV used by the cipher suite 229 * @validate_frames: validation mode 230 * @operational: MAC_Operational flag 231 * @protect_frames: enable protection for this SecY 232 * @replay_protect: enable packet number checks on receive 233 * @replay_window: size of the replay window 234 * @tx_sc: transmit secure channel 235 * @rx_sc: linked list of receive secure channels 236 */ 237 struct macsec_secy { 238 struct net_device *netdev; 239 unsigned int n_rx_sc; 240 sci_t sci; 241 u16 key_len; 242 u16 icv_len; 243 enum macsec_validation_type validate_frames; 244 bool operational; 245 bool protect_frames; 246 bool replay_protect; 247 u32 replay_window; 248 struct macsec_tx_sc tx_sc; 249 struct macsec_rx_sc __rcu *rx_sc; 250 }; 251 252 struct pcpu_secy_stats { 253 struct macsec_dev_stats stats; 254 struct u64_stats_sync syncp; 255 }; 256 257 /** 258 * struct macsec_dev - private data 259 * @secy: SecY config 260 * @real_dev: pointer to underlying netdevice 261 * @stats: MACsec device stats 262 * @secys: linked list of SecY's on the underlying device 263 */ 264 struct macsec_dev { 265 struct macsec_secy secy; 266 struct net_device *real_dev; 267 struct pcpu_secy_stats __percpu *stats; 268 struct list_head secys; 269 struct gro_cells gro_cells; 270 }; 271 272 /** 273 * struct macsec_rxh_data - rx_handler private argument 274 * @secys: linked list of SecY's on this underlying device 275 */ 276 struct macsec_rxh_data { 277 struct list_head secys; 278 }; 279 280 static struct macsec_dev *macsec_priv(const struct net_device *dev) 281 { 282 return (struct macsec_dev *)netdev_priv(dev); 283 } 284 285 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev) 286 { 287 return rcu_dereference_bh(dev->rx_handler_data); 288 } 289 290 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev) 291 { 292 return rtnl_dereference(dev->rx_handler_data); 293 } 294 295 struct macsec_cb { 296 struct aead_request *req; 297 union { 298 struct macsec_tx_sa *tx_sa; 299 struct macsec_rx_sa *rx_sa; 300 }; 301 u8 assoc_num; 302 bool valid; 303 bool has_sci; 304 }; 305 306 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr) 307 { 308 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr); 309 310 if (!sa || !sa->active) 311 return NULL; 312 313 if (!refcount_inc_not_zero(&sa->refcnt)) 314 return NULL; 315 316 return sa; 317 } 318 319 static void free_rx_sc_rcu(struct rcu_head *head) 320 { 321 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head); 322 323 free_percpu(rx_sc->stats); 324 kfree(rx_sc); 325 } 326 327 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc) 328 { 329 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL; 330 } 331 332 static void macsec_rxsc_put(struct macsec_rx_sc *sc) 333 { 334 if (refcount_dec_and_test(&sc->refcnt)) 335 call_rcu(&sc->rcu_head, free_rx_sc_rcu); 336 } 337 338 static void free_rxsa(struct rcu_head *head) 339 { 340 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu); 341 342 crypto_free_aead(sa->key.tfm); 343 free_percpu(sa->stats); 344 kfree(sa); 345 } 346 347 static void macsec_rxsa_put(struct macsec_rx_sa *sa) 348 { 349 if (refcount_dec_and_test(&sa->refcnt)) 350 call_rcu(&sa->rcu, free_rxsa); 351 } 352 353 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr) 354 { 355 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr); 356 357 if (!sa || !sa->active) 358 return NULL; 359 360 if (!refcount_inc_not_zero(&sa->refcnt)) 361 return NULL; 362 363 return sa; 364 } 365 366 static void free_txsa(struct rcu_head *head) 367 { 368 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu); 369 370 crypto_free_aead(sa->key.tfm); 371 free_percpu(sa->stats); 372 kfree(sa); 373 } 374 375 static void macsec_txsa_put(struct macsec_tx_sa *sa) 376 { 377 if (refcount_dec_and_test(&sa->refcnt)) 378 call_rcu(&sa->rcu, free_txsa); 379 } 380 381 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) 382 { 383 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); 384 return (struct macsec_cb *)skb->cb; 385 } 386 387 #define MACSEC_PORT_ES (htons(0x0001)) 388 #define MACSEC_PORT_SCB (0x0000) 389 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL) 390 391 #define MACSEC_GCM_AES_128_SAK_LEN 16 392 #define MACSEC_GCM_AES_256_SAK_LEN 32 393 394 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN 395 #define DEFAULT_SEND_SCI true 396 #define DEFAULT_ENCRYPT false 397 #define DEFAULT_ENCODING_SA 0 398 399 static bool send_sci(const struct macsec_secy *secy) 400 { 401 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 402 403 return tx_sc->send_sci || 404 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb); 405 } 406 407 static sci_t make_sci(u8 *addr, __be16 port) 408 { 409 sci_t sci; 410 411 memcpy(&sci, addr, ETH_ALEN); 412 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); 413 414 return sci; 415 } 416 417 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present) 418 { 419 sci_t sci; 420 421 if (sci_present) 422 memcpy(&sci, hdr->secure_channel_id, 423 sizeof(hdr->secure_channel_id)); 424 else 425 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); 426 427 return sci; 428 } 429 430 static unsigned int macsec_sectag_len(bool sci_present) 431 { 432 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); 433 } 434 435 static unsigned int macsec_hdr_len(bool sci_present) 436 { 437 return macsec_sectag_len(sci_present) + ETH_HLEN; 438 } 439 440 static unsigned int macsec_extra_len(bool sci_present) 441 { 442 return macsec_sectag_len(sci_present) + sizeof(__be16); 443 } 444 445 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ 446 static void macsec_fill_sectag(struct macsec_eth_header *h, 447 const struct macsec_secy *secy, u32 pn, 448 bool sci_present) 449 { 450 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 451 452 memset(&h->tci_an, 0, macsec_sectag_len(sci_present)); 453 h->eth.h_proto = htons(ETH_P_MACSEC); 454 455 if (sci_present) { 456 h->tci_an |= MACSEC_TCI_SC; 457 memcpy(&h->secure_channel_id, &secy->sci, 458 sizeof(h->secure_channel_id)); 459 } else { 460 if (tx_sc->end_station) 461 h->tci_an |= MACSEC_TCI_ES; 462 if (tx_sc->scb) 463 h->tci_an |= MACSEC_TCI_SCB; 464 } 465 466 h->packet_number = htonl(pn); 467 468 /* with GCM, C/E clear for !encrypt, both set for encrypt */ 469 if (tx_sc->encrypt) 470 h->tci_an |= MACSEC_TCI_CONFID; 471 else if (secy->icv_len != DEFAULT_ICV_LEN) 472 h->tci_an |= MACSEC_TCI_C; 473 474 h->tci_an |= tx_sc->encoding_sa; 475 } 476 477 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) 478 { 479 if (data_len < MIN_NON_SHORT_LEN) 480 h->short_length = data_len; 481 } 482 483 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */ 484 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len) 485 { 486 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; 487 int len = skb->len - 2 * ETH_ALEN; 488 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; 489 490 /* a) It comprises at least 17 octets */ 491 if (skb->len <= 16) 492 return false; 493 494 /* b) MACsec EtherType: already checked */ 495 496 /* c) V bit is clear */ 497 if (h->tci_an & MACSEC_TCI_VERSION) 498 return false; 499 500 /* d) ES or SCB => !SC */ 501 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && 502 (h->tci_an & MACSEC_TCI_SC)) 503 return false; 504 505 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ 506 if (h->unused) 507 return false; 508 509 /* rx.pn != 0 (figure 10-5) */ 510 if (!h->packet_number) 511 return false; 512 513 /* length check, f) g) h) i) */ 514 if (h->short_length) 515 return len == extra_len + h->short_length; 516 return len >= extra_len + MIN_NON_SHORT_LEN; 517 } 518 519 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) 520 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN 521 522 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) 523 { 524 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; 525 526 gcm_iv->sci = sci; 527 gcm_iv->pn = htonl(pn); 528 } 529 530 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) 531 { 532 return (struct macsec_eth_header *)skb_mac_header(skb); 533 } 534 535 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy) 536 { 537 u32 pn; 538 539 spin_lock_bh(&tx_sa->lock); 540 pn = tx_sa->next_pn; 541 542 tx_sa->next_pn++; 543 if (tx_sa->next_pn == 0) { 544 pr_debug("PN wrapped, transitioning to !oper\n"); 545 tx_sa->active = false; 546 if (secy->protect_frames) 547 secy->operational = false; 548 } 549 spin_unlock_bh(&tx_sa->lock); 550 551 return pn; 552 } 553 554 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) 555 { 556 struct macsec_dev *macsec = netdev_priv(dev); 557 558 skb->dev = macsec->real_dev; 559 skb_reset_mac_header(skb); 560 skb->protocol = eth_hdr(skb)->h_proto; 561 } 562 563 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, 564 struct macsec_tx_sa *tx_sa) 565 { 566 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); 567 568 u64_stats_update_begin(&txsc_stats->syncp); 569 if (tx_sc->encrypt) { 570 txsc_stats->stats.OutOctetsEncrypted += skb->len; 571 txsc_stats->stats.OutPktsEncrypted++; 572 this_cpu_inc(tx_sa->stats->OutPktsEncrypted); 573 } else { 574 txsc_stats->stats.OutOctetsProtected += skb->len; 575 txsc_stats->stats.OutPktsProtected++; 576 this_cpu_inc(tx_sa->stats->OutPktsProtected); 577 } 578 u64_stats_update_end(&txsc_stats->syncp); 579 } 580 581 static void count_tx(struct net_device *dev, int ret, int len) 582 { 583 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 584 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 585 586 u64_stats_update_begin(&stats->syncp); 587 stats->tx_packets++; 588 stats->tx_bytes += len; 589 u64_stats_update_end(&stats->syncp); 590 } 591 } 592 593 static void macsec_encrypt_done(struct crypto_async_request *base, int err) 594 { 595 struct sk_buff *skb = base->data; 596 struct net_device *dev = skb->dev; 597 struct macsec_dev *macsec = macsec_priv(dev); 598 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 599 int len, ret; 600 601 aead_request_free(macsec_skb_cb(skb)->req); 602 603 rcu_read_lock_bh(); 604 macsec_encrypt_finish(skb, dev); 605 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 606 len = skb->len; 607 ret = dev_queue_xmit(skb); 608 count_tx(dev, ret, len); 609 rcu_read_unlock_bh(); 610 611 macsec_txsa_put(sa); 612 dev_put(dev); 613 } 614 615 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, 616 unsigned char **iv, 617 struct scatterlist **sg, 618 int num_frags) 619 { 620 size_t size, iv_offset, sg_offset; 621 struct aead_request *req; 622 void *tmp; 623 624 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); 625 iv_offset = size; 626 size += GCM_AES_IV_LEN; 627 628 size = ALIGN(size, __alignof__(struct scatterlist)); 629 sg_offset = size; 630 size += sizeof(struct scatterlist) * num_frags; 631 632 tmp = kmalloc(size, GFP_ATOMIC); 633 if (!tmp) 634 return NULL; 635 636 *iv = (unsigned char *)(tmp + iv_offset); 637 *sg = (struct scatterlist *)(tmp + sg_offset); 638 req = tmp; 639 640 aead_request_set_tfm(req, tfm); 641 642 return req; 643 } 644 645 static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 646 struct net_device *dev) 647 { 648 int ret; 649 struct scatterlist *sg; 650 struct sk_buff *trailer; 651 unsigned char *iv; 652 struct ethhdr *eth; 653 struct macsec_eth_header *hh; 654 size_t unprotected_len; 655 struct aead_request *req; 656 struct macsec_secy *secy; 657 struct macsec_tx_sc *tx_sc; 658 struct macsec_tx_sa *tx_sa; 659 struct macsec_dev *macsec = macsec_priv(dev); 660 bool sci_present; 661 u32 pn; 662 663 secy = &macsec->secy; 664 tx_sc = &secy->tx_sc; 665 666 /* 10.5.1 TX SA assignment */ 667 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); 668 if (!tx_sa) { 669 secy->operational = false; 670 kfree_skb(skb); 671 return ERR_PTR(-EINVAL); 672 } 673 674 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || 675 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { 676 struct sk_buff *nskb = skb_copy_expand(skb, 677 MACSEC_NEEDED_HEADROOM, 678 MACSEC_NEEDED_TAILROOM, 679 GFP_ATOMIC); 680 if (likely(nskb)) { 681 consume_skb(skb); 682 skb = nskb; 683 } else { 684 macsec_txsa_put(tx_sa); 685 kfree_skb(skb); 686 return ERR_PTR(-ENOMEM); 687 } 688 } else { 689 skb = skb_unshare(skb, GFP_ATOMIC); 690 if (!skb) { 691 macsec_txsa_put(tx_sa); 692 return ERR_PTR(-ENOMEM); 693 } 694 } 695 696 unprotected_len = skb->len; 697 eth = eth_hdr(skb); 698 sci_present = send_sci(secy); 699 hh = skb_push(skb, macsec_extra_len(sci_present)); 700 memmove(hh, eth, 2 * ETH_ALEN); 701 702 pn = tx_sa_update_pn(tx_sa, secy); 703 if (pn == 0) { 704 macsec_txsa_put(tx_sa); 705 kfree_skb(skb); 706 return ERR_PTR(-ENOLINK); 707 } 708 macsec_fill_sectag(hh, secy, pn, sci_present); 709 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); 710 711 skb_put(skb, secy->icv_len); 712 713 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { 714 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 715 716 u64_stats_update_begin(&secy_stats->syncp); 717 secy_stats->stats.OutPktsTooLong++; 718 u64_stats_update_end(&secy_stats->syncp); 719 720 macsec_txsa_put(tx_sa); 721 kfree_skb(skb); 722 return ERR_PTR(-EINVAL); 723 } 724 725 ret = skb_cow_data(skb, 0, &trailer); 726 if (unlikely(ret < 0)) { 727 macsec_txsa_put(tx_sa); 728 kfree_skb(skb); 729 return ERR_PTR(ret); 730 } 731 732 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret); 733 if (!req) { 734 macsec_txsa_put(tx_sa); 735 kfree_skb(skb); 736 return ERR_PTR(-ENOMEM); 737 } 738 739 macsec_fill_iv(iv, secy->sci, pn); 740 741 sg_init_table(sg, ret); 742 ret = skb_to_sgvec(skb, sg, 0, skb->len); 743 if (unlikely(ret < 0)) { 744 aead_request_free(req); 745 macsec_txsa_put(tx_sa); 746 kfree_skb(skb); 747 return ERR_PTR(ret); 748 } 749 750 if (tx_sc->encrypt) { 751 int len = skb->len - macsec_hdr_len(sci_present) - 752 secy->icv_len; 753 aead_request_set_crypt(req, sg, sg, len, iv); 754 aead_request_set_ad(req, macsec_hdr_len(sci_present)); 755 } else { 756 aead_request_set_crypt(req, sg, sg, 0, iv); 757 aead_request_set_ad(req, skb->len - secy->icv_len); 758 } 759 760 macsec_skb_cb(skb)->req = req; 761 macsec_skb_cb(skb)->tx_sa = tx_sa; 762 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 763 764 dev_hold(skb->dev); 765 ret = crypto_aead_encrypt(req); 766 if (ret == -EINPROGRESS) { 767 return ERR_PTR(ret); 768 } else if (ret != 0) { 769 dev_put(skb->dev); 770 kfree_skb(skb); 771 aead_request_free(req); 772 macsec_txsa_put(tx_sa); 773 return ERR_PTR(-EINVAL); 774 } 775 776 dev_put(skb->dev); 777 aead_request_free(req); 778 macsec_txsa_put(tx_sa); 779 780 return skb; 781 } 782 783 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 784 { 785 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 786 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 787 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 788 u32 lowest_pn = 0; 789 790 spin_lock(&rx_sa->lock); 791 if (rx_sa->next_pn >= secy->replay_window) 792 lowest_pn = rx_sa->next_pn - secy->replay_window; 793 794 /* Now perform replay protection check again 795 * (see IEEE 802.1AE-2006 figure 10-5) 796 */ 797 if (secy->replay_protect && pn < lowest_pn) { 798 spin_unlock(&rx_sa->lock); 799 u64_stats_update_begin(&rxsc_stats->syncp); 800 rxsc_stats->stats.InPktsLate++; 801 u64_stats_update_end(&rxsc_stats->syncp); 802 return false; 803 } 804 805 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 806 u64_stats_update_begin(&rxsc_stats->syncp); 807 if (hdr->tci_an & MACSEC_TCI_E) 808 rxsc_stats->stats.InOctetsDecrypted += skb->len; 809 else 810 rxsc_stats->stats.InOctetsValidated += skb->len; 811 u64_stats_update_end(&rxsc_stats->syncp); 812 } 813 814 if (!macsec_skb_cb(skb)->valid) { 815 spin_unlock(&rx_sa->lock); 816 817 /* 10.6.5 */ 818 if (hdr->tci_an & MACSEC_TCI_C || 819 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 820 u64_stats_update_begin(&rxsc_stats->syncp); 821 rxsc_stats->stats.InPktsNotValid++; 822 u64_stats_update_end(&rxsc_stats->syncp); 823 return false; 824 } 825 826 u64_stats_update_begin(&rxsc_stats->syncp); 827 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 828 rxsc_stats->stats.InPktsInvalid++; 829 this_cpu_inc(rx_sa->stats->InPktsInvalid); 830 } else if (pn < lowest_pn) { 831 rxsc_stats->stats.InPktsDelayed++; 832 } else { 833 rxsc_stats->stats.InPktsUnchecked++; 834 } 835 u64_stats_update_end(&rxsc_stats->syncp); 836 } else { 837 u64_stats_update_begin(&rxsc_stats->syncp); 838 if (pn < lowest_pn) { 839 rxsc_stats->stats.InPktsDelayed++; 840 } else { 841 rxsc_stats->stats.InPktsOK++; 842 this_cpu_inc(rx_sa->stats->InPktsOK); 843 } 844 u64_stats_update_end(&rxsc_stats->syncp); 845 846 if (pn >= rx_sa->next_pn) 847 rx_sa->next_pn = pn + 1; 848 spin_unlock(&rx_sa->lock); 849 } 850 851 return true; 852 } 853 854 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 855 { 856 skb->pkt_type = PACKET_HOST; 857 skb->protocol = eth_type_trans(skb, dev); 858 859 skb_reset_network_header(skb); 860 if (!skb_transport_header_was_set(skb)) 861 skb_reset_transport_header(skb); 862 skb_reset_mac_len(skb); 863 } 864 865 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 866 { 867 skb->ip_summed = CHECKSUM_NONE; 868 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 869 skb_pull(skb, hdr_len); 870 pskb_trim_unique(skb, skb->len - icv_len); 871 } 872 873 static void count_rx(struct net_device *dev, int len) 874 { 875 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 876 877 u64_stats_update_begin(&stats->syncp); 878 stats->rx_packets++; 879 stats->rx_bytes += len; 880 u64_stats_update_end(&stats->syncp); 881 } 882 883 static void macsec_decrypt_done(struct crypto_async_request *base, int err) 884 { 885 struct sk_buff *skb = base->data; 886 struct net_device *dev = skb->dev; 887 struct macsec_dev *macsec = macsec_priv(dev); 888 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 889 struct macsec_rx_sc *rx_sc = rx_sa->sc; 890 int len; 891 u32 pn; 892 893 aead_request_free(macsec_skb_cb(skb)->req); 894 895 if (!err) 896 macsec_skb_cb(skb)->valid = true; 897 898 rcu_read_lock_bh(); 899 pn = ntohl(macsec_ethhdr(skb)->packet_number); 900 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 901 rcu_read_unlock_bh(); 902 kfree_skb(skb); 903 goto out; 904 } 905 906 macsec_finalize_skb(skb, macsec->secy.icv_len, 907 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 908 macsec_reset_skb(skb, macsec->secy.netdev); 909 910 len = skb->len; 911 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS) 912 count_rx(dev, len); 913 914 rcu_read_unlock_bh(); 915 916 out: 917 macsec_rxsa_put(rx_sa); 918 macsec_rxsc_put(rx_sc); 919 dev_put(dev); 920 } 921 922 static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 923 struct net_device *dev, 924 struct macsec_rx_sa *rx_sa, 925 sci_t sci, 926 struct macsec_secy *secy) 927 { 928 int ret; 929 struct scatterlist *sg; 930 struct sk_buff *trailer; 931 unsigned char *iv; 932 struct aead_request *req; 933 struct macsec_eth_header *hdr; 934 u16 icv_len = secy->icv_len; 935 936 macsec_skb_cb(skb)->valid = false; 937 skb = skb_share_check(skb, GFP_ATOMIC); 938 if (!skb) 939 return ERR_PTR(-ENOMEM); 940 941 ret = skb_cow_data(skb, 0, &trailer); 942 if (unlikely(ret < 0)) { 943 kfree_skb(skb); 944 return ERR_PTR(ret); 945 } 946 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret); 947 if (!req) { 948 kfree_skb(skb); 949 return ERR_PTR(-ENOMEM); 950 } 951 952 hdr = (struct macsec_eth_header *)skb->data; 953 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number)); 954 955 sg_init_table(sg, ret); 956 ret = skb_to_sgvec(skb, sg, 0, skb->len); 957 if (unlikely(ret < 0)) { 958 aead_request_free(req); 959 kfree_skb(skb); 960 return ERR_PTR(ret); 961 } 962 963 if (hdr->tci_an & MACSEC_TCI_E) { 964 /* confidentiality: ethernet + macsec header 965 * authenticated, encrypted payload 966 */ 967 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 968 969 aead_request_set_crypt(req, sg, sg, len, iv); 970 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 971 skb = skb_unshare(skb, GFP_ATOMIC); 972 if (!skb) { 973 aead_request_free(req); 974 return ERR_PTR(-ENOMEM); 975 } 976 } else { 977 /* integrity only: all headers + data authenticated */ 978 aead_request_set_crypt(req, sg, sg, icv_len, iv); 979 aead_request_set_ad(req, skb->len - icv_len); 980 } 981 982 macsec_skb_cb(skb)->req = req; 983 skb->dev = dev; 984 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 985 986 dev_hold(dev); 987 ret = crypto_aead_decrypt(req); 988 if (ret == -EINPROGRESS) { 989 return ERR_PTR(ret); 990 } else if (ret != 0) { 991 /* decryption/authentication failed 992 * 10.6 if validateFrames is disabled, deliver anyway 993 */ 994 if (ret != -EBADMSG) { 995 kfree_skb(skb); 996 skb = ERR_PTR(ret); 997 } 998 } else { 999 macsec_skb_cb(skb)->valid = true; 1000 } 1001 dev_put(dev); 1002 1003 aead_request_free(req); 1004 1005 return skb; 1006 } 1007 1008 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 1009 { 1010 struct macsec_rx_sc *rx_sc; 1011 1012 for_each_rxsc(secy, rx_sc) { 1013 if (rx_sc->sci == sci) 1014 return rx_sc; 1015 } 1016 1017 return NULL; 1018 } 1019 1020 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 1021 { 1022 struct macsec_rx_sc *rx_sc; 1023 1024 for_each_rxsc_rtnl(secy, rx_sc) { 1025 if (rx_sc->sci == sci) 1026 return rx_sc; 1027 } 1028 1029 return NULL; 1030 } 1031 1032 static void handle_not_macsec(struct sk_buff *skb) 1033 { 1034 struct macsec_rxh_data *rxd; 1035 struct macsec_dev *macsec; 1036 1037 rcu_read_lock(); 1038 rxd = macsec_data_rcu(skb->dev); 1039 1040 /* 10.6 If the management control validateFrames is not 1041 * Strict, frames without a SecTAG are received, counted, and 1042 * delivered to the Controlled Port 1043 */ 1044 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1045 struct sk_buff *nskb; 1046 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 1047 1048 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1049 u64_stats_update_begin(&secy_stats->syncp); 1050 secy_stats->stats.InPktsNoTag++; 1051 u64_stats_update_end(&secy_stats->syncp); 1052 continue; 1053 } 1054 1055 /* deliver on this port */ 1056 nskb = skb_clone(skb, GFP_ATOMIC); 1057 if (!nskb) 1058 break; 1059 1060 nskb->dev = macsec->secy.netdev; 1061 1062 if (netif_rx(nskb) == NET_RX_SUCCESS) { 1063 u64_stats_update_begin(&secy_stats->syncp); 1064 secy_stats->stats.InPktsUntagged++; 1065 u64_stats_update_end(&secy_stats->syncp); 1066 } 1067 } 1068 1069 rcu_read_unlock(); 1070 } 1071 1072 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 1073 { 1074 struct sk_buff *skb = *pskb; 1075 struct net_device *dev = skb->dev; 1076 struct macsec_eth_header *hdr; 1077 struct macsec_secy *secy = NULL; 1078 struct macsec_rx_sc *rx_sc; 1079 struct macsec_rx_sa *rx_sa; 1080 struct macsec_rxh_data *rxd; 1081 struct macsec_dev *macsec; 1082 sci_t sci; 1083 u32 pn; 1084 bool cbit; 1085 struct pcpu_rx_sc_stats *rxsc_stats; 1086 struct pcpu_secy_stats *secy_stats; 1087 bool pulled_sci; 1088 int ret; 1089 1090 if (skb_headroom(skb) < ETH_HLEN) 1091 goto drop_direct; 1092 1093 hdr = macsec_ethhdr(skb); 1094 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) { 1095 handle_not_macsec(skb); 1096 1097 /* and deliver to the uncontrolled port */ 1098 return RX_HANDLER_PASS; 1099 } 1100 1101 skb = skb_unshare(skb, GFP_ATOMIC); 1102 *pskb = skb; 1103 if (!skb) 1104 return RX_HANDLER_CONSUMED; 1105 1106 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1107 if (!pulled_sci) { 1108 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1109 goto drop_direct; 1110 } 1111 1112 hdr = macsec_ethhdr(skb); 1113 1114 /* Frames with a SecTAG that has the TCI E bit set but the C 1115 * bit clear are discarded, as this reserved encoding is used 1116 * to identify frames with a SecTAG that are not to be 1117 * delivered to the Controlled Port. 1118 */ 1119 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1120 return RX_HANDLER_PASS; 1121 1122 /* now, pull the extra length */ 1123 if (hdr->tci_an & MACSEC_TCI_SC) { 1124 if (!pulled_sci) 1125 goto drop_direct; 1126 } 1127 1128 /* ethernet header is part of crypto processing */ 1129 skb_push(skb, ETH_HLEN); 1130 1131 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1132 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1133 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci); 1134 1135 rcu_read_lock(); 1136 rxd = macsec_data_rcu(skb->dev); 1137 1138 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1139 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1140 1141 sc = sc ? macsec_rxsc_get(sc) : NULL; 1142 1143 if (sc) { 1144 secy = &macsec->secy; 1145 rx_sc = sc; 1146 break; 1147 } 1148 } 1149 1150 if (!secy) 1151 goto nosci; 1152 1153 dev = secy->netdev; 1154 macsec = macsec_priv(dev); 1155 secy_stats = this_cpu_ptr(macsec->stats); 1156 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1157 1158 if (!macsec_validate_skb(skb, secy->icv_len)) { 1159 u64_stats_update_begin(&secy_stats->syncp); 1160 secy_stats->stats.InPktsBadTag++; 1161 u64_stats_update_end(&secy_stats->syncp); 1162 goto drop_nosa; 1163 } 1164 1165 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1166 if (!rx_sa) { 1167 /* 10.6.1 if the SA is not in use */ 1168 1169 /* If validateFrames is Strict or the C bit in the 1170 * SecTAG is set, discard 1171 */ 1172 if (hdr->tci_an & MACSEC_TCI_C || 1173 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1174 u64_stats_update_begin(&rxsc_stats->syncp); 1175 rxsc_stats->stats.InPktsNotUsingSA++; 1176 u64_stats_update_end(&rxsc_stats->syncp); 1177 goto drop_nosa; 1178 } 1179 1180 /* not Strict, the frame (with the SecTAG and ICV 1181 * removed) is delivered to the Controlled Port. 1182 */ 1183 u64_stats_update_begin(&rxsc_stats->syncp); 1184 rxsc_stats->stats.InPktsUnusedSA++; 1185 u64_stats_update_end(&rxsc_stats->syncp); 1186 goto deliver; 1187 } 1188 1189 /* First, PN check to avoid decrypting obviously wrong packets */ 1190 pn = ntohl(hdr->packet_number); 1191 if (secy->replay_protect) { 1192 bool late; 1193 1194 spin_lock(&rx_sa->lock); 1195 late = rx_sa->next_pn >= secy->replay_window && 1196 pn < (rx_sa->next_pn - secy->replay_window); 1197 spin_unlock(&rx_sa->lock); 1198 1199 if (late) { 1200 u64_stats_update_begin(&rxsc_stats->syncp); 1201 rxsc_stats->stats.InPktsLate++; 1202 u64_stats_update_end(&rxsc_stats->syncp); 1203 goto drop; 1204 } 1205 } 1206 1207 macsec_skb_cb(skb)->rx_sa = rx_sa; 1208 1209 /* Disabled && !changed text => skip validation */ 1210 if (hdr->tci_an & MACSEC_TCI_C || 1211 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1212 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1213 1214 if (IS_ERR(skb)) { 1215 /* the decrypt callback needs the reference */ 1216 if (PTR_ERR(skb) != -EINPROGRESS) { 1217 macsec_rxsa_put(rx_sa); 1218 macsec_rxsc_put(rx_sc); 1219 } 1220 rcu_read_unlock(); 1221 *pskb = NULL; 1222 return RX_HANDLER_CONSUMED; 1223 } 1224 1225 if (!macsec_post_decrypt(skb, secy, pn)) 1226 goto drop; 1227 1228 deliver: 1229 macsec_finalize_skb(skb, secy->icv_len, 1230 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1231 macsec_reset_skb(skb, secy->netdev); 1232 1233 if (rx_sa) 1234 macsec_rxsa_put(rx_sa); 1235 macsec_rxsc_put(rx_sc); 1236 1237 skb_orphan(skb); 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 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1585 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1586 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1587 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1588 }; 1589 1590 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1591 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1592 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, 1593 }; 1594 1595 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1596 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, 1597 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, 1598 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 }, 1599 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY, 1600 .len = MACSEC_KEYID_LEN, }, 1601 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1602 .len = MACSEC_MAX_KEY_LEN, }, 1603 }; 1604 1605 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1606 { 1607 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1608 return -EINVAL; 1609 1610 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL)) 1611 return -EINVAL; 1612 1613 return 0; 1614 } 1615 1616 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1617 { 1618 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1619 return -EINVAL; 1620 1621 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL)) 1622 return -EINVAL; 1623 1624 return 0; 1625 } 1626 1627 static bool validate_add_rxsa(struct nlattr **attrs) 1628 { 1629 if (!attrs[MACSEC_SA_ATTR_AN] || 1630 !attrs[MACSEC_SA_ATTR_KEY] || 1631 !attrs[MACSEC_SA_ATTR_KEYID]) 1632 return false; 1633 1634 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1635 return false; 1636 1637 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1638 return false; 1639 1640 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1641 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1642 return false; 1643 } 1644 1645 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1646 return false; 1647 1648 return true; 1649 } 1650 1651 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1652 { 1653 struct net_device *dev; 1654 struct nlattr **attrs = info->attrs; 1655 struct macsec_secy *secy; 1656 struct macsec_rx_sc *rx_sc; 1657 struct macsec_rx_sa *rx_sa; 1658 unsigned char assoc_num; 1659 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1660 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1661 int err; 1662 1663 if (!attrs[MACSEC_ATTR_IFINDEX]) 1664 return -EINVAL; 1665 1666 if (parse_sa_config(attrs, tb_sa)) 1667 return -EINVAL; 1668 1669 if (parse_rxsc_config(attrs, tb_rxsc)) 1670 return -EINVAL; 1671 1672 if (!validate_add_rxsa(tb_sa)) 1673 return -EINVAL; 1674 1675 rtnl_lock(); 1676 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1677 if (IS_ERR(rx_sc)) { 1678 rtnl_unlock(); 1679 return PTR_ERR(rx_sc); 1680 } 1681 1682 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1683 1684 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1685 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1686 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1687 rtnl_unlock(); 1688 return -EINVAL; 1689 } 1690 1691 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1692 if (rx_sa) { 1693 rtnl_unlock(); 1694 return -EBUSY; 1695 } 1696 1697 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1698 if (!rx_sa) { 1699 rtnl_unlock(); 1700 return -ENOMEM; 1701 } 1702 1703 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1704 secy->key_len, secy->icv_len); 1705 if (err < 0) { 1706 kfree(rx_sa); 1707 rtnl_unlock(); 1708 return err; 1709 } 1710 1711 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1712 spin_lock_bh(&rx_sa->lock); 1713 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1714 spin_unlock_bh(&rx_sa->lock); 1715 } 1716 1717 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1718 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1719 1720 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1721 rx_sa->sc = rx_sc; 1722 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1723 1724 rtnl_unlock(); 1725 1726 return 0; 1727 } 1728 1729 static bool validate_add_rxsc(struct nlattr **attrs) 1730 { 1731 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1732 return false; 1733 1734 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1735 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1736 return false; 1737 } 1738 1739 return true; 1740 } 1741 1742 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1743 { 1744 struct net_device *dev; 1745 sci_t sci = MACSEC_UNDEF_SCI; 1746 struct nlattr **attrs = info->attrs; 1747 struct macsec_rx_sc *rx_sc; 1748 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1749 1750 if (!attrs[MACSEC_ATTR_IFINDEX]) 1751 return -EINVAL; 1752 1753 if (parse_rxsc_config(attrs, tb_rxsc)) 1754 return -EINVAL; 1755 1756 if (!validate_add_rxsc(tb_rxsc)) 1757 return -EINVAL; 1758 1759 rtnl_lock(); 1760 dev = get_dev_from_nl(genl_info_net(info), attrs); 1761 if (IS_ERR(dev)) { 1762 rtnl_unlock(); 1763 return PTR_ERR(dev); 1764 } 1765 1766 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1767 1768 rx_sc = create_rx_sc(dev, sci); 1769 if (IS_ERR(rx_sc)) { 1770 rtnl_unlock(); 1771 return PTR_ERR(rx_sc); 1772 } 1773 1774 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1775 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1776 1777 rtnl_unlock(); 1778 1779 return 0; 1780 } 1781 1782 static bool validate_add_txsa(struct nlattr **attrs) 1783 { 1784 if (!attrs[MACSEC_SA_ATTR_AN] || 1785 !attrs[MACSEC_SA_ATTR_PN] || 1786 !attrs[MACSEC_SA_ATTR_KEY] || 1787 !attrs[MACSEC_SA_ATTR_KEYID]) 1788 return false; 1789 1790 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1791 return false; 1792 1793 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1794 return false; 1795 1796 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1797 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1798 return false; 1799 } 1800 1801 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1802 return false; 1803 1804 return true; 1805 } 1806 1807 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1808 { 1809 struct net_device *dev; 1810 struct nlattr **attrs = info->attrs; 1811 struct macsec_secy *secy; 1812 struct macsec_tx_sc *tx_sc; 1813 struct macsec_tx_sa *tx_sa; 1814 unsigned char assoc_num; 1815 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1816 int err; 1817 1818 if (!attrs[MACSEC_ATTR_IFINDEX]) 1819 return -EINVAL; 1820 1821 if (parse_sa_config(attrs, tb_sa)) 1822 return -EINVAL; 1823 1824 if (!validate_add_txsa(tb_sa)) 1825 return -EINVAL; 1826 1827 rtnl_lock(); 1828 dev = get_dev_from_nl(genl_info_net(info), attrs); 1829 if (IS_ERR(dev)) { 1830 rtnl_unlock(); 1831 return PTR_ERR(dev); 1832 } 1833 1834 secy = &macsec_priv(dev)->secy; 1835 tx_sc = &secy->tx_sc; 1836 1837 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1838 1839 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1840 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 1841 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1842 rtnl_unlock(); 1843 return -EINVAL; 1844 } 1845 1846 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 1847 if (tx_sa) { 1848 rtnl_unlock(); 1849 return -EBUSY; 1850 } 1851 1852 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 1853 if (!tx_sa) { 1854 rtnl_unlock(); 1855 return -ENOMEM; 1856 } 1857 1858 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1859 secy->key_len, secy->icv_len); 1860 if (err < 0) { 1861 kfree(tx_sa); 1862 rtnl_unlock(); 1863 return err; 1864 } 1865 1866 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1867 1868 spin_lock_bh(&tx_sa->lock); 1869 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1870 spin_unlock_bh(&tx_sa->lock); 1871 1872 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1873 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1874 1875 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 1876 secy->operational = true; 1877 1878 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 1879 1880 rtnl_unlock(); 1881 1882 return 0; 1883 } 1884 1885 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 1886 { 1887 struct nlattr **attrs = info->attrs; 1888 struct net_device *dev; 1889 struct macsec_secy *secy; 1890 struct macsec_rx_sc *rx_sc; 1891 struct macsec_rx_sa *rx_sa; 1892 u8 assoc_num; 1893 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1894 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1895 1896 if (!attrs[MACSEC_ATTR_IFINDEX]) 1897 return -EINVAL; 1898 1899 if (parse_sa_config(attrs, tb_sa)) 1900 return -EINVAL; 1901 1902 if (parse_rxsc_config(attrs, tb_rxsc)) 1903 return -EINVAL; 1904 1905 rtnl_lock(); 1906 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 1907 &dev, &secy, &rx_sc, &assoc_num); 1908 if (IS_ERR(rx_sa)) { 1909 rtnl_unlock(); 1910 return PTR_ERR(rx_sa); 1911 } 1912 1913 if (rx_sa->active) { 1914 rtnl_unlock(); 1915 return -EBUSY; 1916 } 1917 1918 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 1919 clear_rx_sa(rx_sa); 1920 1921 rtnl_unlock(); 1922 1923 return 0; 1924 } 1925 1926 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 1927 { 1928 struct nlattr **attrs = info->attrs; 1929 struct net_device *dev; 1930 struct macsec_secy *secy; 1931 struct macsec_rx_sc *rx_sc; 1932 sci_t sci; 1933 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1934 1935 if (!attrs[MACSEC_ATTR_IFINDEX]) 1936 return -EINVAL; 1937 1938 if (parse_rxsc_config(attrs, tb_rxsc)) 1939 return -EINVAL; 1940 1941 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1942 return -EINVAL; 1943 1944 rtnl_lock(); 1945 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 1946 if (IS_ERR(dev)) { 1947 rtnl_unlock(); 1948 return PTR_ERR(dev); 1949 } 1950 1951 secy = &macsec_priv(dev)->secy; 1952 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1953 1954 rx_sc = del_rx_sc(secy, sci); 1955 if (!rx_sc) { 1956 rtnl_unlock(); 1957 return -ENODEV; 1958 } 1959 1960 free_rx_sc(rx_sc); 1961 rtnl_unlock(); 1962 1963 return 0; 1964 } 1965 1966 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 1967 { 1968 struct nlattr **attrs = info->attrs; 1969 struct net_device *dev; 1970 struct macsec_secy *secy; 1971 struct macsec_tx_sc *tx_sc; 1972 struct macsec_tx_sa *tx_sa; 1973 u8 assoc_num; 1974 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1975 1976 if (!attrs[MACSEC_ATTR_IFINDEX]) 1977 return -EINVAL; 1978 1979 if (parse_sa_config(attrs, tb_sa)) 1980 return -EINVAL; 1981 1982 rtnl_lock(); 1983 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 1984 &dev, &secy, &tx_sc, &assoc_num); 1985 if (IS_ERR(tx_sa)) { 1986 rtnl_unlock(); 1987 return PTR_ERR(tx_sa); 1988 } 1989 1990 if (tx_sa->active) { 1991 rtnl_unlock(); 1992 return -EBUSY; 1993 } 1994 1995 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 1996 clear_tx_sa(tx_sa); 1997 1998 rtnl_unlock(); 1999 2000 return 0; 2001 } 2002 2003 static bool validate_upd_sa(struct nlattr **attrs) 2004 { 2005 if (!attrs[MACSEC_SA_ATTR_AN] || 2006 attrs[MACSEC_SA_ATTR_KEY] || 2007 attrs[MACSEC_SA_ATTR_KEYID]) 2008 return false; 2009 2010 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 2011 return false; 2012 2013 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 2014 return false; 2015 2016 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 2017 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 2018 return false; 2019 } 2020 2021 return true; 2022 } 2023 2024 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2025 { 2026 struct nlattr **attrs = info->attrs; 2027 struct net_device *dev; 2028 struct macsec_secy *secy; 2029 struct macsec_tx_sc *tx_sc; 2030 struct macsec_tx_sa *tx_sa; 2031 u8 assoc_num; 2032 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2033 2034 if (!attrs[MACSEC_ATTR_IFINDEX]) 2035 return -EINVAL; 2036 2037 if (parse_sa_config(attrs, tb_sa)) 2038 return -EINVAL; 2039 2040 if (!validate_upd_sa(tb_sa)) 2041 return -EINVAL; 2042 2043 rtnl_lock(); 2044 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2045 &dev, &secy, &tx_sc, &assoc_num); 2046 if (IS_ERR(tx_sa)) { 2047 rtnl_unlock(); 2048 return PTR_ERR(tx_sa); 2049 } 2050 2051 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2052 spin_lock_bh(&tx_sa->lock); 2053 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 2054 spin_unlock_bh(&tx_sa->lock); 2055 } 2056 2057 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2058 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2059 2060 if (assoc_num == tx_sc->encoding_sa) 2061 secy->operational = tx_sa->active; 2062 2063 rtnl_unlock(); 2064 2065 return 0; 2066 } 2067 2068 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2069 { 2070 struct nlattr **attrs = info->attrs; 2071 struct net_device *dev; 2072 struct macsec_secy *secy; 2073 struct macsec_rx_sc *rx_sc; 2074 struct macsec_rx_sa *rx_sa; 2075 u8 assoc_num; 2076 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2077 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2078 2079 if (!attrs[MACSEC_ATTR_IFINDEX]) 2080 return -EINVAL; 2081 2082 if (parse_rxsc_config(attrs, tb_rxsc)) 2083 return -EINVAL; 2084 2085 if (parse_sa_config(attrs, tb_sa)) 2086 return -EINVAL; 2087 2088 if (!validate_upd_sa(tb_sa)) 2089 return -EINVAL; 2090 2091 rtnl_lock(); 2092 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2093 &dev, &secy, &rx_sc, &assoc_num); 2094 if (IS_ERR(rx_sa)) { 2095 rtnl_unlock(); 2096 return PTR_ERR(rx_sa); 2097 } 2098 2099 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2100 spin_lock_bh(&rx_sa->lock); 2101 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 2102 spin_unlock_bh(&rx_sa->lock); 2103 } 2104 2105 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2106 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2107 2108 rtnl_unlock(); 2109 return 0; 2110 } 2111 2112 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2113 { 2114 struct nlattr **attrs = info->attrs; 2115 struct net_device *dev; 2116 struct macsec_secy *secy; 2117 struct macsec_rx_sc *rx_sc; 2118 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2119 2120 if (!attrs[MACSEC_ATTR_IFINDEX]) 2121 return -EINVAL; 2122 2123 if (parse_rxsc_config(attrs, tb_rxsc)) 2124 return -EINVAL; 2125 2126 if (!validate_add_rxsc(tb_rxsc)) 2127 return -EINVAL; 2128 2129 rtnl_lock(); 2130 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2131 if (IS_ERR(rx_sc)) { 2132 rtnl_unlock(); 2133 return PTR_ERR(rx_sc); 2134 } 2135 2136 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2137 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2138 2139 if (rx_sc->active != new) 2140 secy->n_rx_sc += new ? 1 : -1; 2141 2142 rx_sc->active = new; 2143 } 2144 2145 rtnl_unlock(); 2146 2147 return 0; 2148 } 2149 2150 static int copy_tx_sa_stats(struct sk_buff *skb, 2151 struct macsec_tx_sa_stats __percpu *pstats) 2152 { 2153 struct macsec_tx_sa_stats sum = {0, }; 2154 int cpu; 2155 2156 for_each_possible_cpu(cpu) { 2157 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2158 2159 sum.OutPktsProtected += stats->OutPktsProtected; 2160 sum.OutPktsEncrypted += stats->OutPktsEncrypted; 2161 } 2162 2163 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) || 2164 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted)) 2165 return -EMSGSIZE; 2166 2167 return 0; 2168 } 2169 2170 static noinline_for_stack int 2171 copy_rx_sa_stats(struct sk_buff *skb, 2172 struct macsec_rx_sa_stats __percpu *pstats) 2173 { 2174 struct macsec_rx_sa_stats sum = {0, }; 2175 int cpu; 2176 2177 for_each_possible_cpu(cpu) { 2178 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2179 2180 sum.InPktsOK += stats->InPktsOK; 2181 sum.InPktsInvalid += stats->InPktsInvalid; 2182 sum.InPktsNotValid += stats->InPktsNotValid; 2183 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA; 2184 sum.InPktsUnusedSA += stats->InPktsUnusedSA; 2185 } 2186 2187 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) || 2188 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) || 2189 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) || 2190 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) || 2191 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA)) 2192 return -EMSGSIZE; 2193 2194 return 0; 2195 } 2196 2197 static noinline_for_stack int 2198 copy_rx_sc_stats(struct sk_buff *skb, struct pcpu_rx_sc_stats __percpu *pstats) 2199 { 2200 struct macsec_rx_sc_stats sum = {0, }; 2201 int cpu; 2202 2203 for_each_possible_cpu(cpu) { 2204 const struct pcpu_rx_sc_stats *stats; 2205 struct macsec_rx_sc_stats tmp; 2206 unsigned int start; 2207 2208 stats = per_cpu_ptr(pstats, cpu); 2209 do { 2210 start = u64_stats_fetch_begin_irq(&stats->syncp); 2211 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2212 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2213 2214 sum.InOctetsValidated += tmp.InOctetsValidated; 2215 sum.InOctetsDecrypted += tmp.InOctetsDecrypted; 2216 sum.InPktsUnchecked += tmp.InPktsUnchecked; 2217 sum.InPktsDelayed += tmp.InPktsDelayed; 2218 sum.InPktsOK += tmp.InPktsOK; 2219 sum.InPktsInvalid += tmp.InPktsInvalid; 2220 sum.InPktsLate += tmp.InPktsLate; 2221 sum.InPktsNotValid += tmp.InPktsNotValid; 2222 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2223 sum.InPktsUnusedSA += tmp.InPktsUnusedSA; 2224 } 2225 2226 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2227 sum.InOctetsValidated, 2228 MACSEC_RXSC_STATS_ATTR_PAD) || 2229 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2230 sum.InOctetsDecrypted, 2231 MACSEC_RXSC_STATS_ATTR_PAD) || 2232 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2233 sum.InPktsUnchecked, 2234 MACSEC_RXSC_STATS_ATTR_PAD) || 2235 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2236 sum.InPktsDelayed, 2237 MACSEC_RXSC_STATS_ATTR_PAD) || 2238 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2239 sum.InPktsOK, 2240 MACSEC_RXSC_STATS_ATTR_PAD) || 2241 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2242 sum.InPktsInvalid, 2243 MACSEC_RXSC_STATS_ATTR_PAD) || 2244 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2245 sum.InPktsLate, 2246 MACSEC_RXSC_STATS_ATTR_PAD) || 2247 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2248 sum.InPktsNotValid, 2249 MACSEC_RXSC_STATS_ATTR_PAD) || 2250 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2251 sum.InPktsNotUsingSA, 2252 MACSEC_RXSC_STATS_ATTR_PAD) || 2253 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2254 sum.InPktsUnusedSA, 2255 MACSEC_RXSC_STATS_ATTR_PAD)) 2256 return -EMSGSIZE; 2257 2258 return 0; 2259 } 2260 2261 static noinline_for_stack int 2262 copy_tx_sc_stats(struct sk_buff *skb, struct pcpu_tx_sc_stats __percpu *pstats) 2263 { 2264 struct macsec_tx_sc_stats sum = {0, }; 2265 int cpu; 2266 2267 for_each_possible_cpu(cpu) { 2268 const struct pcpu_tx_sc_stats *stats; 2269 struct macsec_tx_sc_stats tmp; 2270 unsigned int start; 2271 2272 stats = per_cpu_ptr(pstats, cpu); 2273 do { 2274 start = u64_stats_fetch_begin_irq(&stats->syncp); 2275 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2276 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2277 2278 sum.OutPktsProtected += tmp.OutPktsProtected; 2279 sum.OutPktsEncrypted += tmp.OutPktsEncrypted; 2280 sum.OutOctetsProtected += tmp.OutOctetsProtected; 2281 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2282 } 2283 2284 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2285 sum.OutPktsProtected, 2286 MACSEC_TXSC_STATS_ATTR_PAD) || 2287 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2288 sum.OutPktsEncrypted, 2289 MACSEC_TXSC_STATS_ATTR_PAD) || 2290 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2291 sum.OutOctetsProtected, 2292 MACSEC_TXSC_STATS_ATTR_PAD) || 2293 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2294 sum.OutOctetsEncrypted, 2295 MACSEC_TXSC_STATS_ATTR_PAD)) 2296 return -EMSGSIZE; 2297 2298 return 0; 2299 } 2300 2301 static noinline_for_stack int 2302 copy_secy_stats(struct sk_buff *skb, struct pcpu_secy_stats __percpu *pstats) 2303 { 2304 struct macsec_dev_stats sum = {0, }; 2305 int cpu; 2306 2307 for_each_possible_cpu(cpu) { 2308 const struct pcpu_secy_stats *stats; 2309 struct macsec_dev_stats tmp; 2310 unsigned int start; 2311 2312 stats = per_cpu_ptr(pstats, cpu); 2313 do { 2314 start = u64_stats_fetch_begin_irq(&stats->syncp); 2315 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2316 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2317 2318 sum.OutPktsUntagged += tmp.OutPktsUntagged; 2319 sum.InPktsUntagged += tmp.InPktsUntagged; 2320 sum.OutPktsTooLong += tmp.OutPktsTooLong; 2321 sum.InPktsNoTag += tmp.InPktsNoTag; 2322 sum.InPktsBadTag += tmp.InPktsBadTag; 2323 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2324 sum.InPktsNoSCI += tmp.InPktsNoSCI; 2325 sum.InPktsOverrun += tmp.InPktsOverrun; 2326 } 2327 2328 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 2329 sum.OutPktsUntagged, 2330 MACSEC_SECY_STATS_ATTR_PAD) || 2331 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 2332 sum.InPktsUntagged, 2333 MACSEC_SECY_STATS_ATTR_PAD) || 2334 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 2335 sum.OutPktsTooLong, 2336 MACSEC_SECY_STATS_ATTR_PAD) || 2337 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 2338 sum.InPktsNoTag, 2339 MACSEC_SECY_STATS_ATTR_PAD) || 2340 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 2341 sum.InPktsBadTag, 2342 MACSEC_SECY_STATS_ATTR_PAD) || 2343 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 2344 sum.InPktsUnknownSCI, 2345 MACSEC_SECY_STATS_ATTR_PAD) || 2346 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 2347 sum.InPktsNoSCI, 2348 MACSEC_SECY_STATS_ATTR_PAD) || 2349 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 2350 sum.InPktsOverrun, 2351 MACSEC_SECY_STATS_ATTR_PAD)) 2352 return -EMSGSIZE; 2353 2354 return 0; 2355 } 2356 2357 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 2358 { 2359 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2360 struct nlattr *secy_nest = nla_nest_start_noflag(skb, 2361 MACSEC_ATTR_SECY); 2362 u64 csid; 2363 2364 if (!secy_nest) 2365 return 1; 2366 2367 switch (secy->key_len) { 2368 case MACSEC_GCM_AES_128_SAK_LEN: 2369 csid = MACSEC_DEFAULT_CIPHER_ID; 2370 break; 2371 case MACSEC_GCM_AES_256_SAK_LEN: 2372 csid = MACSEC_CIPHER_ID_GCM_AES_256; 2373 break; 2374 default: 2375 goto cancel; 2376 } 2377 2378 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 2379 MACSEC_SECY_ATTR_PAD) || 2380 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 2381 csid, MACSEC_SECY_ATTR_PAD) || 2382 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 2383 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 2384 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 2385 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 2386 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 2387 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 2388 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 2389 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 2390 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 2391 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 2392 goto cancel; 2393 2394 if (secy->replay_protect) { 2395 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 2396 goto cancel; 2397 } 2398 2399 nla_nest_end(skb, secy_nest); 2400 return 0; 2401 2402 cancel: 2403 nla_nest_cancel(skb, secy_nest); 2404 return 1; 2405 } 2406 2407 static noinline_for_stack int 2408 dump_secy(struct macsec_secy *secy, struct net_device *dev, 2409 struct sk_buff *skb, struct netlink_callback *cb) 2410 { 2411 struct macsec_rx_sc *rx_sc; 2412 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2413 struct nlattr *txsa_list, *rxsc_list; 2414 int i, j; 2415 void *hdr; 2416 struct nlattr *attr; 2417 2418 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 2419 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 2420 if (!hdr) 2421 return -EMSGSIZE; 2422 2423 genl_dump_check_consistent(cb, hdr); 2424 2425 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 2426 goto nla_put_failure; 2427 2428 if (nla_put_secy(secy, skb)) 2429 goto nla_put_failure; 2430 2431 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS); 2432 if (!attr) 2433 goto nla_put_failure; 2434 if (copy_tx_sc_stats(skb, tx_sc->stats)) { 2435 nla_nest_cancel(skb, attr); 2436 goto nla_put_failure; 2437 } 2438 nla_nest_end(skb, attr); 2439 2440 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS); 2441 if (!attr) 2442 goto nla_put_failure; 2443 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) { 2444 nla_nest_cancel(skb, attr); 2445 goto nla_put_failure; 2446 } 2447 nla_nest_end(skb, attr); 2448 2449 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST); 2450 if (!txsa_list) 2451 goto nla_put_failure; 2452 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 2453 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 2454 struct nlattr *txsa_nest; 2455 2456 if (!tx_sa) 2457 continue; 2458 2459 txsa_nest = nla_nest_start_noflag(skb, j++); 2460 if (!txsa_nest) { 2461 nla_nest_cancel(skb, txsa_list); 2462 goto nla_put_failure; 2463 } 2464 2465 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2466 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) || 2467 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 2468 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 2469 nla_nest_cancel(skb, txsa_nest); 2470 nla_nest_cancel(skb, txsa_list); 2471 goto nla_put_failure; 2472 } 2473 2474 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS); 2475 if (!attr) { 2476 nla_nest_cancel(skb, txsa_nest); 2477 nla_nest_cancel(skb, txsa_list); 2478 goto nla_put_failure; 2479 } 2480 if (copy_tx_sa_stats(skb, tx_sa->stats)) { 2481 nla_nest_cancel(skb, attr); 2482 nla_nest_cancel(skb, txsa_nest); 2483 nla_nest_cancel(skb, txsa_list); 2484 goto nla_put_failure; 2485 } 2486 nla_nest_end(skb, attr); 2487 2488 nla_nest_end(skb, txsa_nest); 2489 } 2490 nla_nest_end(skb, txsa_list); 2491 2492 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST); 2493 if (!rxsc_list) 2494 goto nla_put_failure; 2495 2496 j = 1; 2497 for_each_rxsc_rtnl(secy, rx_sc) { 2498 int k; 2499 struct nlattr *rxsa_list; 2500 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++); 2501 2502 if (!rxsc_nest) { 2503 nla_nest_cancel(skb, rxsc_list); 2504 goto nla_put_failure; 2505 } 2506 2507 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 2508 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 2509 MACSEC_RXSC_ATTR_PAD)) { 2510 nla_nest_cancel(skb, rxsc_nest); 2511 nla_nest_cancel(skb, rxsc_list); 2512 goto nla_put_failure; 2513 } 2514 2515 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS); 2516 if (!attr) { 2517 nla_nest_cancel(skb, rxsc_nest); 2518 nla_nest_cancel(skb, rxsc_list); 2519 goto nla_put_failure; 2520 } 2521 if (copy_rx_sc_stats(skb, rx_sc->stats)) { 2522 nla_nest_cancel(skb, attr); 2523 nla_nest_cancel(skb, rxsc_nest); 2524 nla_nest_cancel(skb, rxsc_list); 2525 goto nla_put_failure; 2526 } 2527 nla_nest_end(skb, attr); 2528 2529 rxsa_list = nla_nest_start_noflag(skb, 2530 MACSEC_RXSC_ATTR_SA_LIST); 2531 if (!rxsa_list) { 2532 nla_nest_cancel(skb, rxsc_nest); 2533 nla_nest_cancel(skb, rxsc_list); 2534 goto nla_put_failure; 2535 } 2536 2537 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 2538 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 2539 struct nlattr *rxsa_nest; 2540 2541 if (!rx_sa) 2542 continue; 2543 2544 rxsa_nest = nla_nest_start_noflag(skb, k++); 2545 if (!rxsa_nest) { 2546 nla_nest_cancel(skb, rxsa_list); 2547 nla_nest_cancel(skb, rxsc_nest); 2548 nla_nest_cancel(skb, rxsc_list); 2549 goto nla_put_failure; 2550 } 2551 2552 attr = nla_nest_start_noflag(skb, 2553 MACSEC_SA_ATTR_STATS); 2554 if (!attr) { 2555 nla_nest_cancel(skb, rxsa_list); 2556 nla_nest_cancel(skb, rxsc_nest); 2557 nla_nest_cancel(skb, rxsc_list); 2558 goto nla_put_failure; 2559 } 2560 if (copy_rx_sa_stats(skb, rx_sa->stats)) { 2561 nla_nest_cancel(skb, attr); 2562 nla_nest_cancel(skb, rxsa_list); 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, attr); 2568 2569 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2570 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) || 2571 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 2572 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 2573 nla_nest_cancel(skb, rxsa_nest); 2574 nla_nest_cancel(skb, rxsc_nest); 2575 nla_nest_cancel(skb, rxsc_list); 2576 goto nla_put_failure; 2577 } 2578 nla_nest_end(skb, rxsa_nest); 2579 } 2580 2581 nla_nest_end(skb, rxsa_list); 2582 nla_nest_end(skb, rxsc_nest); 2583 } 2584 2585 nla_nest_end(skb, rxsc_list); 2586 2587 genlmsg_end(skb, hdr); 2588 2589 return 0; 2590 2591 nla_put_failure: 2592 genlmsg_cancel(skb, hdr); 2593 return -EMSGSIZE; 2594 } 2595 2596 static int macsec_generation = 1; /* protected by RTNL */ 2597 2598 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 2599 { 2600 struct net *net = sock_net(skb->sk); 2601 struct net_device *dev; 2602 int dev_idx, d; 2603 2604 dev_idx = cb->args[0]; 2605 2606 d = 0; 2607 rtnl_lock(); 2608 2609 cb->seq = macsec_generation; 2610 2611 for_each_netdev(net, dev) { 2612 struct macsec_secy *secy; 2613 2614 if (d < dev_idx) 2615 goto next; 2616 2617 if (!netif_is_macsec(dev)) 2618 goto next; 2619 2620 secy = &macsec_priv(dev)->secy; 2621 if (dump_secy(secy, dev, skb, cb) < 0) 2622 goto done; 2623 next: 2624 d++; 2625 } 2626 2627 done: 2628 rtnl_unlock(); 2629 cb->args[0] = d; 2630 return skb->len; 2631 } 2632 2633 static const struct genl_ops macsec_genl_ops[] = { 2634 { 2635 .cmd = MACSEC_CMD_GET_TXSC, 2636 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2637 .dumpit = macsec_dump_txsc, 2638 }, 2639 { 2640 .cmd = MACSEC_CMD_ADD_RXSC, 2641 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2642 .doit = macsec_add_rxsc, 2643 .flags = GENL_ADMIN_PERM, 2644 }, 2645 { 2646 .cmd = MACSEC_CMD_DEL_RXSC, 2647 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2648 .doit = macsec_del_rxsc, 2649 .flags = GENL_ADMIN_PERM, 2650 }, 2651 { 2652 .cmd = MACSEC_CMD_UPD_RXSC, 2653 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2654 .doit = macsec_upd_rxsc, 2655 .flags = GENL_ADMIN_PERM, 2656 }, 2657 { 2658 .cmd = MACSEC_CMD_ADD_TXSA, 2659 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2660 .doit = macsec_add_txsa, 2661 .flags = GENL_ADMIN_PERM, 2662 }, 2663 { 2664 .cmd = MACSEC_CMD_DEL_TXSA, 2665 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2666 .doit = macsec_del_txsa, 2667 .flags = GENL_ADMIN_PERM, 2668 }, 2669 { 2670 .cmd = MACSEC_CMD_UPD_TXSA, 2671 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2672 .doit = macsec_upd_txsa, 2673 .flags = GENL_ADMIN_PERM, 2674 }, 2675 { 2676 .cmd = MACSEC_CMD_ADD_RXSA, 2677 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2678 .doit = macsec_add_rxsa, 2679 .flags = GENL_ADMIN_PERM, 2680 }, 2681 { 2682 .cmd = MACSEC_CMD_DEL_RXSA, 2683 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2684 .doit = macsec_del_rxsa, 2685 .flags = GENL_ADMIN_PERM, 2686 }, 2687 { 2688 .cmd = MACSEC_CMD_UPD_RXSA, 2689 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2690 .doit = macsec_upd_rxsa, 2691 .flags = GENL_ADMIN_PERM, 2692 }, 2693 }; 2694 2695 static struct genl_family macsec_fam __ro_after_init = { 2696 .name = MACSEC_GENL_NAME, 2697 .hdrsize = 0, 2698 .version = MACSEC_GENL_VERSION, 2699 .maxattr = MACSEC_ATTR_MAX, 2700 .policy = macsec_genl_policy, 2701 .netnsok = true, 2702 .module = THIS_MODULE, 2703 .ops = macsec_genl_ops, 2704 .n_ops = ARRAY_SIZE(macsec_genl_ops), 2705 }; 2706 2707 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 2708 struct net_device *dev) 2709 { 2710 struct macsec_dev *macsec = netdev_priv(dev); 2711 struct macsec_secy *secy = &macsec->secy; 2712 struct pcpu_secy_stats *secy_stats; 2713 int ret, len; 2714 2715 /* 10.5 */ 2716 if (!secy->protect_frames) { 2717 secy_stats = this_cpu_ptr(macsec->stats); 2718 u64_stats_update_begin(&secy_stats->syncp); 2719 secy_stats->stats.OutPktsUntagged++; 2720 u64_stats_update_end(&secy_stats->syncp); 2721 skb->dev = macsec->real_dev; 2722 len = skb->len; 2723 ret = dev_queue_xmit(skb); 2724 count_tx(dev, ret, len); 2725 return ret; 2726 } 2727 2728 if (!secy->operational) { 2729 kfree_skb(skb); 2730 dev->stats.tx_dropped++; 2731 return NETDEV_TX_OK; 2732 } 2733 2734 skb = macsec_encrypt(skb, dev); 2735 if (IS_ERR(skb)) { 2736 if (PTR_ERR(skb) != -EINPROGRESS) 2737 dev->stats.tx_dropped++; 2738 return NETDEV_TX_OK; 2739 } 2740 2741 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 2742 2743 macsec_encrypt_finish(skb, dev); 2744 len = skb->len; 2745 ret = dev_queue_xmit(skb); 2746 count_tx(dev, ret, len); 2747 return ret; 2748 } 2749 2750 #define MACSEC_FEATURES \ 2751 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 2752 2753 static int macsec_dev_init(struct net_device *dev) 2754 { 2755 struct macsec_dev *macsec = macsec_priv(dev); 2756 struct net_device *real_dev = macsec->real_dev; 2757 int err; 2758 2759 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 2760 if (!dev->tstats) 2761 return -ENOMEM; 2762 2763 err = gro_cells_init(&macsec->gro_cells, dev); 2764 if (err) { 2765 free_percpu(dev->tstats); 2766 return err; 2767 } 2768 2769 dev->features = real_dev->features & MACSEC_FEATURES; 2770 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 2771 2772 dev->needed_headroom = real_dev->needed_headroom + 2773 MACSEC_NEEDED_HEADROOM; 2774 dev->needed_tailroom = real_dev->needed_tailroom + 2775 MACSEC_NEEDED_TAILROOM; 2776 2777 if (is_zero_ether_addr(dev->dev_addr)) 2778 eth_hw_addr_inherit(dev, real_dev); 2779 if (is_zero_ether_addr(dev->broadcast)) 2780 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 2781 2782 return 0; 2783 } 2784 2785 static void macsec_dev_uninit(struct net_device *dev) 2786 { 2787 struct macsec_dev *macsec = macsec_priv(dev); 2788 2789 gro_cells_destroy(&macsec->gro_cells); 2790 free_percpu(dev->tstats); 2791 } 2792 2793 static netdev_features_t macsec_fix_features(struct net_device *dev, 2794 netdev_features_t features) 2795 { 2796 struct macsec_dev *macsec = macsec_priv(dev); 2797 struct net_device *real_dev = macsec->real_dev; 2798 2799 features &= (real_dev->features & MACSEC_FEATURES) | 2800 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 2801 features |= NETIF_F_LLTX; 2802 2803 return features; 2804 } 2805 2806 static int macsec_dev_open(struct net_device *dev) 2807 { 2808 struct macsec_dev *macsec = macsec_priv(dev); 2809 struct net_device *real_dev = macsec->real_dev; 2810 int err; 2811 2812 err = dev_uc_add(real_dev, dev->dev_addr); 2813 if (err < 0) 2814 return err; 2815 2816 if (dev->flags & IFF_ALLMULTI) { 2817 err = dev_set_allmulti(real_dev, 1); 2818 if (err < 0) 2819 goto del_unicast; 2820 } 2821 2822 if (dev->flags & IFF_PROMISC) { 2823 err = dev_set_promiscuity(real_dev, 1); 2824 if (err < 0) 2825 goto clear_allmulti; 2826 } 2827 2828 if (netif_carrier_ok(real_dev)) 2829 netif_carrier_on(dev); 2830 2831 return 0; 2832 clear_allmulti: 2833 if (dev->flags & IFF_ALLMULTI) 2834 dev_set_allmulti(real_dev, -1); 2835 del_unicast: 2836 dev_uc_del(real_dev, dev->dev_addr); 2837 netif_carrier_off(dev); 2838 return err; 2839 } 2840 2841 static int macsec_dev_stop(struct net_device *dev) 2842 { 2843 struct macsec_dev *macsec = macsec_priv(dev); 2844 struct net_device *real_dev = macsec->real_dev; 2845 2846 netif_carrier_off(dev); 2847 2848 dev_mc_unsync(real_dev, dev); 2849 dev_uc_unsync(real_dev, dev); 2850 2851 if (dev->flags & IFF_ALLMULTI) 2852 dev_set_allmulti(real_dev, -1); 2853 2854 if (dev->flags & IFF_PROMISC) 2855 dev_set_promiscuity(real_dev, -1); 2856 2857 dev_uc_del(real_dev, dev->dev_addr); 2858 2859 return 0; 2860 } 2861 2862 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 2863 { 2864 struct net_device *real_dev = macsec_priv(dev)->real_dev; 2865 2866 if (!(dev->flags & IFF_UP)) 2867 return; 2868 2869 if (change & IFF_ALLMULTI) 2870 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 2871 2872 if (change & IFF_PROMISC) 2873 dev_set_promiscuity(real_dev, 2874 dev->flags & IFF_PROMISC ? 1 : -1); 2875 } 2876 2877 static void macsec_dev_set_rx_mode(struct net_device *dev) 2878 { 2879 struct net_device *real_dev = macsec_priv(dev)->real_dev; 2880 2881 dev_mc_sync(real_dev, dev); 2882 dev_uc_sync(real_dev, dev); 2883 } 2884 2885 static int macsec_set_mac_address(struct net_device *dev, void *p) 2886 { 2887 struct macsec_dev *macsec = macsec_priv(dev); 2888 struct net_device *real_dev = macsec->real_dev; 2889 struct sockaddr *addr = p; 2890 int err; 2891 2892 if (!is_valid_ether_addr(addr->sa_data)) 2893 return -EADDRNOTAVAIL; 2894 2895 if (!(dev->flags & IFF_UP)) 2896 goto out; 2897 2898 err = dev_uc_add(real_dev, addr->sa_data); 2899 if (err < 0) 2900 return err; 2901 2902 dev_uc_del(real_dev, dev->dev_addr); 2903 2904 out: 2905 ether_addr_copy(dev->dev_addr, addr->sa_data); 2906 return 0; 2907 } 2908 2909 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 2910 { 2911 struct macsec_dev *macsec = macsec_priv(dev); 2912 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 2913 2914 if (macsec->real_dev->mtu - extra < new_mtu) 2915 return -ERANGE; 2916 2917 dev->mtu = new_mtu; 2918 2919 return 0; 2920 } 2921 2922 static void macsec_get_stats64(struct net_device *dev, 2923 struct rtnl_link_stats64 *s) 2924 { 2925 int cpu; 2926 2927 if (!dev->tstats) 2928 return; 2929 2930 for_each_possible_cpu(cpu) { 2931 struct pcpu_sw_netstats *stats; 2932 struct pcpu_sw_netstats tmp; 2933 int start; 2934 2935 stats = per_cpu_ptr(dev->tstats, cpu); 2936 do { 2937 start = u64_stats_fetch_begin_irq(&stats->syncp); 2938 tmp.rx_packets = stats->rx_packets; 2939 tmp.rx_bytes = stats->rx_bytes; 2940 tmp.tx_packets = stats->tx_packets; 2941 tmp.tx_bytes = stats->tx_bytes; 2942 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2943 2944 s->rx_packets += tmp.rx_packets; 2945 s->rx_bytes += tmp.rx_bytes; 2946 s->tx_packets += tmp.tx_packets; 2947 s->tx_bytes += tmp.tx_bytes; 2948 } 2949 2950 s->rx_dropped = dev->stats.rx_dropped; 2951 s->tx_dropped = dev->stats.tx_dropped; 2952 } 2953 2954 static int macsec_get_iflink(const struct net_device *dev) 2955 { 2956 return macsec_priv(dev)->real_dev->ifindex; 2957 } 2958 2959 static const struct net_device_ops macsec_netdev_ops = { 2960 .ndo_init = macsec_dev_init, 2961 .ndo_uninit = macsec_dev_uninit, 2962 .ndo_open = macsec_dev_open, 2963 .ndo_stop = macsec_dev_stop, 2964 .ndo_fix_features = macsec_fix_features, 2965 .ndo_change_mtu = macsec_change_mtu, 2966 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 2967 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 2968 .ndo_set_mac_address = macsec_set_mac_address, 2969 .ndo_start_xmit = macsec_start_xmit, 2970 .ndo_get_stats64 = macsec_get_stats64, 2971 .ndo_get_iflink = macsec_get_iflink, 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 2997 free_percpu(macsec->stats); 2998 free_percpu(macsec->secy.tx_sc.stats); 2999 3000 } 3001 3002 static void macsec_setup(struct net_device *dev) 3003 { 3004 ether_setup(dev); 3005 dev->min_mtu = 0; 3006 dev->max_mtu = ETH_MAX_MTU; 3007 dev->priv_flags |= IFF_NO_QUEUE; 3008 dev->netdev_ops = &macsec_netdev_ops; 3009 dev->needs_free_netdev = true; 3010 dev->priv_destructor = macsec_free_netdev; 3011 SET_NETDEV_DEVTYPE(dev, &macsec_type); 3012 3013 eth_zero_addr(dev->broadcast); 3014 } 3015 3016 static int macsec_changelink_common(struct net_device *dev, 3017 struct nlattr *data[]) 3018 { 3019 struct macsec_secy *secy; 3020 struct macsec_tx_sc *tx_sc; 3021 3022 secy = &macsec_priv(dev)->secy; 3023 tx_sc = &secy->tx_sc; 3024 3025 if (data[IFLA_MACSEC_ENCODING_SA]) { 3026 struct macsec_tx_sa *tx_sa; 3027 3028 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3029 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 3030 3031 secy->operational = tx_sa && tx_sa->active; 3032 } 3033 3034 if (data[IFLA_MACSEC_WINDOW]) 3035 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3036 3037 if (data[IFLA_MACSEC_ENCRYPT]) 3038 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3039 3040 if (data[IFLA_MACSEC_PROTECT]) 3041 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3042 3043 if (data[IFLA_MACSEC_INC_SCI]) 3044 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3045 3046 if (data[IFLA_MACSEC_ES]) 3047 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3048 3049 if (data[IFLA_MACSEC_SCB]) 3050 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3051 3052 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3053 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3054 3055 if (data[IFLA_MACSEC_VALIDATION]) 3056 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3057 3058 if (data[IFLA_MACSEC_CIPHER_SUITE]) { 3059 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) { 3060 case MACSEC_CIPHER_ID_GCM_AES_128: 3061 case MACSEC_DEFAULT_CIPHER_ID: 3062 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3063 break; 3064 case MACSEC_CIPHER_ID_GCM_AES_256: 3065 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3066 break; 3067 default: 3068 return -EINVAL; 3069 } 3070 } 3071 3072 return 0; 3073 } 3074 3075 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3076 struct nlattr *data[], 3077 struct netlink_ext_ack *extack) 3078 { 3079 if (!data) 3080 return 0; 3081 3082 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3083 data[IFLA_MACSEC_ICV_LEN] || 3084 data[IFLA_MACSEC_SCI] || 3085 data[IFLA_MACSEC_PORT]) 3086 return -EINVAL; 3087 3088 return macsec_changelink_common(dev, data); 3089 } 3090 3091 static void macsec_del_dev(struct macsec_dev *macsec) 3092 { 3093 int i; 3094 3095 while (macsec->secy.rx_sc) { 3096 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 3097 3098 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 3099 free_rx_sc(rx_sc); 3100 } 3101 3102 for (i = 0; i < MACSEC_NUM_AN; i++) { 3103 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 3104 3105 if (sa) { 3106 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 3107 clear_tx_sa(sa); 3108 } 3109 } 3110 } 3111 3112 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 3113 { 3114 struct macsec_dev *macsec = macsec_priv(dev); 3115 struct net_device *real_dev = macsec->real_dev; 3116 3117 unregister_netdevice_queue(dev, head); 3118 list_del_rcu(&macsec->secys); 3119 macsec_del_dev(macsec); 3120 netdev_upper_dev_unlink(real_dev, dev); 3121 3122 macsec_generation++; 3123 } 3124 3125 static void macsec_dellink(struct net_device *dev, struct list_head *head) 3126 { 3127 struct macsec_dev *macsec = macsec_priv(dev); 3128 struct net_device *real_dev = macsec->real_dev; 3129 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3130 3131 macsec_common_dellink(dev, head); 3132 3133 if (list_empty(&rxd->secys)) { 3134 netdev_rx_handler_unregister(real_dev); 3135 kfree(rxd); 3136 } 3137 } 3138 3139 static int register_macsec_dev(struct net_device *real_dev, 3140 struct net_device *dev) 3141 { 3142 struct macsec_dev *macsec = macsec_priv(dev); 3143 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3144 3145 if (!rxd) { 3146 int err; 3147 3148 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 3149 if (!rxd) 3150 return -ENOMEM; 3151 3152 INIT_LIST_HEAD(&rxd->secys); 3153 3154 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 3155 rxd); 3156 if (err < 0) { 3157 kfree(rxd); 3158 return err; 3159 } 3160 } 3161 3162 list_add_tail_rcu(&macsec->secys, &rxd->secys); 3163 return 0; 3164 } 3165 3166 static bool sci_exists(struct net_device *dev, sci_t sci) 3167 { 3168 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 3169 struct macsec_dev *macsec; 3170 3171 list_for_each_entry(macsec, &rxd->secys, secys) { 3172 if (macsec->secy.sci == sci) 3173 return true; 3174 } 3175 3176 return false; 3177 } 3178 3179 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 3180 { 3181 return make_sci(dev->dev_addr, port); 3182 } 3183 3184 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 3185 { 3186 struct macsec_dev *macsec = macsec_priv(dev); 3187 struct macsec_secy *secy = &macsec->secy; 3188 3189 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 3190 if (!macsec->stats) 3191 return -ENOMEM; 3192 3193 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 3194 if (!secy->tx_sc.stats) { 3195 free_percpu(macsec->stats); 3196 return -ENOMEM; 3197 } 3198 3199 if (sci == MACSEC_UNDEF_SCI) 3200 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3201 3202 secy->netdev = dev; 3203 secy->operational = true; 3204 secy->key_len = DEFAULT_SAK_LEN; 3205 secy->icv_len = icv_len; 3206 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 3207 secy->protect_frames = true; 3208 secy->replay_protect = false; 3209 3210 secy->sci = sci; 3211 secy->tx_sc.active = true; 3212 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 3213 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 3214 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 3215 secy->tx_sc.end_station = false; 3216 secy->tx_sc.scb = false; 3217 3218 return 0; 3219 } 3220 3221 static int macsec_newlink(struct net *net, struct net_device *dev, 3222 struct nlattr *tb[], struct nlattr *data[], 3223 struct netlink_ext_ack *extack) 3224 { 3225 struct macsec_dev *macsec = macsec_priv(dev); 3226 struct net_device *real_dev; 3227 int err; 3228 sci_t sci; 3229 u8 icv_len = DEFAULT_ICV_LEN; 3230 rx_handler_func_t *rx_handler; 3231 3232 if (!tb[IFLA_LINK]) 3233 return -EINVAL; 3234 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 3235 if (!real_dev) 3236 return -ENODEV; 3237 3238 dev->priv_flags |= IFF_MACSEC; 3239 3240 macsec->real_dev = real_dev; 3241 3242 if (data && data[IFLA_MACSEC_ICV_LEN]) 3243 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3244 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 3245 3246 rx_handler = rtnl_dereference(real_dev->rx_handler); 3247 if (rx_handler && rx_handler != macsec_handle_frame) 3248 return -EBUSY; 3249 3250 err = register_netdevice(dev); 3251 if (err < 0) 3252 return err; 3253 3254 err = netdev_upper_dev_link(real_dev, dev, extack); 3255 if (err < 0) 3256 goto unregister; 3257 3258 /* need to be already registered so that ->init has run and 3259 * the MAC addr is set 3260 */ 3261 if (data && data[IFLA_MACSEC_SCI]) 3262 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 3263 else if (data && data[IFLA_MACSEC_PORT]) 3264 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 3265 else 3266 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3267 3268 if (rx_handler && sci_exists(real_dev, sci)) { 3269 err = -EBUSY; 3270 goto unlink; 3271 } 3272 3273 err = macsec_add_dev(dev, sci, icv_len); 3274 if (err) 3275 goto unlink; 3276 3277 if (data) { 3278 err = macsec_changelink_common(dev, data); 3279 if (err) 3280 goto del_dev; 3281 } 3282 3283 err = register_macsec_dev(real_dev, dev); 3284 if (err < 0) 3285 goto del_dev; 3286 3287 netif_stacked_transfer_operstate(real_dev, dev); 3288 linkwatch_fire_event(dev); 3289 3290 macsec_generation++; 3291 3292 return 0; 3293 3294 del_dev: 3295 macsec_del_dev(macsec); 3296 unlink: 3297 netdev_upper_dev_unlink(real_dev, dev); 3298 unregister: 3299 unregister_netdevice(dev); 3300 return err; 3301 } 3302 3303 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], 3304 struct netlink_ext_ack *extack) 3305 { 3306 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 3307 u8 icv_len = DEFAULT_ICV_LEN; 3308 int flag; 3309 bool es, scb, sci; 3310 3311 if (!data) 3312 return 0; 3313 3314 if (data[IFLA_MACSEC_CIPHER_SUITE]) 3315 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 3316 3317 if (data[IFLA_MACSEC_ICV_LEN]) { 3318 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3319 if (icv_len != DEFAULT_ICV_LEN) { 3320 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 3321 struct crypto_aead *dummy_tfm; 3322 3323 dummy_tfm = macsec_alloc_tfm(dummy_key, 3324 DEFAULT_SAK_LEN, 3325 icv_len); 3326 if (IS_ERR(dummy_tfm)) 3327 return PTR_ERR(dummy_tfm); 3328 crypto_free_aead(dummy_tfm); 3329 } 3330 } 3331 3332 switch (csid) { 3333 case MACSEC_CIPHER_ID_GCM_AES_128: 3334 case MACSEC_CIPHER_ID_GCM_AES_256: 3335 case MACSEC_DEFAULT_CIPHER_ID: 3336 if (icv_len < MACSEC_MIN_ICV_LEN || 3337 icv_len > MACSEC_STD_ICV_LEN) 3338 return -EINVAL; 3339 break; 3340 default: 3341 return -EINVAL; 3342 } 3343 3344 if (data[IFLA_MACSEC_ENCODING_SA]) { 3345 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 3346 return -EINVAL; 3347 } 3348 3349 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 3350 flag < IFLA_MACSEC_VALIDATION; 3351 flag++) { 3352 if (data[flag]) { 3353 if (nla_get_u8(data[flag]) > 1) 3354 return -EINVAL; 3355 } 3356 } 3357 3358 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 3359 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 3360 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 3361 3362 if ((sci && (scb || es)) || (scb && es)) 3363 return -EINVAL; 3364 3365 if (data[IFLA_MACSEC_VALIDATION] && 3366 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 3367 return -EINVAL; 3368 3369 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 3370 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 3371 !data[IFLA_MACSEC_WINDOW]) 3372 return -EINVAL; 3373 3374 return 0; 3375 } 3376 3377 static struct net *macsec_get_link_net(const struct net_device *dev) 3378 { 3379 return dev_net(macsec_priv(dev)->real_dev); 3380 } 3381 3382 static size_t macsec_get_size(const struct net_device *dev) 3383 { 3384 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ 3385 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ 3386 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ 3387 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ 3388 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ 3389 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ 3390 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ 3391 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ 3392 nla_total_size(1) + /* IFLA_MACSEC_ES */ 3393 nla_total_size(1) + /* IFLA_MACSEC_SCB */ 3394 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ 3395 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ 3396 0; 3397 } 3398 3399 static int macsec_fill_info(struct sk_buff *skb, 3400 const struct net_device *dev) 3401 { 3402 struct macsec_secy *secy = &macsec_priv(dev)->secy; 3403 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3404 u64 csid; 3405 3406 switch (secy->key_len) { 3407 case MACSEC_GCM_AES_128_SAK_LEN: 3408 csid = MACSEC_DEFAULT_CIPHER_ID; 3409 break; 3410 case MACSEC_GCM_AES_256_SAK_LEN: 3411 csid = MACSEC_CIPHER_ID_GCM_AES_256; 3412 break; 3413 default: 3414 goto nla_put_failure; 3415 } 3416 3417 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 3418 IFLA_MACSEC_PAD) || 3419 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 3420 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 3421 csid, IFLA_MACSEC_PAD) || 3422 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 3423 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 3424 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 3425 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 3426 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 3427 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 3428 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 3429 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 3430 0) 3431 goto nla_put_failure; 3432 3433 if (secy->replay_protect) { 3434 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 3435 goto nla_put_failure; 3436 } 3437 3438 return 0; 3439 3440 nla_put_failure: 3441 return -EMSGSIZE; 3442 } 3443 3444 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 3445 .kind = "macsec", 3446 .priv_size = sizeof(struct macsec_dev), 3447 .maxtype = IFLA_MACSEC_MAX, 3448 .policy = macsec_rtnl_policy, 3449 .setup = macsec_setup, 3450 .validate = macsec_validate_attr, 3451 .newlink = macsec_newlink, 3452 .changelink = macsec_changelink, 3453 .dellink = macsec_dellink, 3454 .get_size = macsec_get_size, 3455 .fill_info = macsec_fill_info, 3456 .get_link_net = macsec_get_link_net, 3457 }; 3458 3459 static bool is_macsec_master(struct net_device *dev) 3460 { 3461 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 3462 } 3463 3464 static int macsec_notify(struct notifier_block *this, unsigned long event, 3465 void *ptr) 3466 { 3467 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 3468 LIST_HEAD(head); 3469 3470 if (!is_macsec_master(real_dev)) 3471 return NOTIFY_DONE; 3472 3473 switch (event) { 3474 case NETDEV_DOWN: 3475 case NETDEV_UP: 3476 case NETDEV_CHANGE: { 3477 struct macsec_dev *m, *n; 3478 struct macsec_rxh_data *rxd; 3479 3480 rxd = macsec_data_rtnl(real_dev); 3481 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 3482 struct net_device *dev = m->secy.netdev; 3483 3484 netif_stacked_transfer_operstate(real_dev, dev); 3485 } 3486 break; 3487 } 3488 case NETDEV_UNREGISTER: { 3489 struct macsec_dev *m, *n; 3490 struct macsec_rxh_data *rxd; 3491 3492 rxd = macsec_data_rtnl(real_dev); 3493 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 3494 macsec_common_dellink(m->secy.netdev, &head); 3495 } 3496 3497 netdev_rx_handler_unregister(real_dev); 3498 kfree(rxd); 3499 3500 unregister_netdevice_many(&head); 3501 break; 3502 } 3503 case NETDEV_CHANGEMTU: { 3504 struct macsec_dev *m; 3505 struct macsec_rxh_data *rxd; 3506 3507 rxd = macsec_data_rtnl(real_dev); 3508 list_for_each_entry(m, &rxd->secys, secys) { 3509 struct net_device *dev = m->secy.netdev; 3510 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 3511 macsec_extra_len(true)); 3512 3513 if (dev->mtu > mtu) 3514 dev_set_mtu(dev, mtu); 3515 } 3516 } 3517 } 3518 3519 return NOTIFY_OK; 3520 } 3521 3522 static struct notifier_block macsec_notifier = { 3523 .notifier_call = macsec_notify, 3524 }; 3525 3526 static int __init macsec_init(void) 3527 { 3528 int err; 3529 3530 pr_info("MACsec IEEE 802.1AE\n"); 3531 err = register_netdevice_notifier(&macsec_notifier); 3532 if (err) 3533 return err; 3534 3535 err = rtnl_link_register(&macsec_link_ops); 3536 if (err) 3537 goto notifier; 3538 3539 err = genl_register_family(&macsec_fam); 3540 if (err) 3541 goto rtnl; 3542 3543 return 0; 3544 3545 rtnl: 3546 rtnl_link_unregister(&macsec_link_ops); 3547 notifier: 3548 unregister_netdevice_notifier(&macsec_notifier); 3549 return err; 3550 } 3551 3552 static void __exit macsec_exit(void) 3553 { 3554 genl_unregister_family(&macsec_fam); 3555 rtnl_link_unregister(&macsec_link_ops); 3556 unregister_netdevice_notifier(&macsec_notifier); 3557 rcu_barrier(); 3558 } 3559 3560 module_init(macsec_init); 3561 module_exit(macsec_exit); 3562 3563 MODULE_ALIAS_RTNL_LINK("macsec"); 3564 MODULE_ALIAS_GENL_FAMILY("macsec"); 3565 3566 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 3567 MODULE_LICENSE("GPL v2"); 3568