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/netdevice.h> 15 #include <linux/rtnetlink.h> 16 #include <linux/refcount.h> 17 #include <net/genetlink.h> 18 #include <net/sock.h> 19 #include <net/gro_cells.h> 20 #include <net/macsec.h> 21 #include <net/dst_metadata.h> 22 #include <linux/phy.h> 23 #include <linux/byteorder/generic.h> 24 #include <linux/if_arp.h> 25 26 #include <uapi/linux/if_macsec.h> 27 28 /* SecTAG length = macsec_eth_header without the optional SCI */ 29 #define MACSEC_TAG_LEN 6 30 31 struct macsec_eth_header { 32 struct ethhdr eth; 33 /* SecTAG */ 34 u8 tci_an; 35 #if defined(__LITTLE_ENDIAN_BITFIELD) 36 u8 short_length:6, 37 unused:2; 38 #elif defined(__BIG_ENDIAN_BITFIELD) 39 u8 unused:2, 40 short_length:6; 41 #else 42 #error "Please fix <asm/byteorder.h>" 43 #endif 44 __be32 packet_number; 45 u8 secure_channel_id[8]; /* optional */ 46 } __packed; 47 48 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */ 49 #define MIN_NON_SHORT_LEN 48 50 51 #define GCM_AES_IV_LEN 12 52 53 #define for_each_rxsc(secy, sc) \ 54 for (sc = rcu_dereference_bh(secy->rx_sc); \ 55 sc; \ 56 sc = rcu_dereference_bh(sc->next)) 57 #define for_each_rxsc_rtnl(secy, sc) \ 58 for (sc = rtnl_dereference(secy->rx_sc); \ 59 sc; \ 60 sc = rtnl_dereference(sc->next)) 61 62 #define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31))) 63 64 struct gcm_iv_xpn { 65 union { 66 u8 short_secure_channel_id[4]; 67 ssci_t ssci; 68 }; 69 __be64 pn; 70 } __packed; 71 72 struct gcm_iv { 73 union { 74 u8 secure_channel_id[8]; 75 sci_t sci; 76 }; 77 __be32 pn; 78 }; 79 80 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT 81 82 struct pcpu_secy_stats { 83 struct macsec_dev_stats stats; 84 struct u64_stats_sync syncp; 85 }; 86 87 /** 88 * struct macsec_dev - private data 89 * @secy: SecY config 90 * @real_dev: pointer to underlying netdevice 91 * @dev_tracker: refcount tracker for @real_dev reference 92 * @stats: MACsec device stats 93 * @secys: linked list of SecY's on the underlying device 94 * @gro_cells: pointer to the Generic Receive Offload cell 95 * @offload: status of offloading on the MACsec device 96 * @insert_tx_tag: when offloading, device requires to insert an 97 * additional tag 98 */ 99 struct macsec_dev { 100 struct macsec_secy secy; 101 struct net_device *real_dev; 102 netdevice_tracker dev_tracker; 103 struct pcpu_secy_stats __percpu *stats; 104 struct list_head secys; 105 struct gro_cells gro_cells; 106 enum macsec_offload offload; 107 bool insert_tx_tag; 108 }; 109 110 /** 111 * struct macsec_rxh_data - rx_handler private argument 112 * @secys: linked list of SecY's on this underlying device 113 */ 114 struct macsec_rxh_data { 115 struct list_head secys; 116 }; 117 118 static struct macsec_dev *macsec_priv(const struct net_device *dev) 119 { 120 return (struct macsec_dev *)netdev_priv(dev); 121 } 122 123 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev) 124 { 125 return rcu_dereference_bh(dev->rx_handler_data); 126 } 127 128 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev) 129 { 130 return rtnl_dereference(dev->rx_handler_data); 131 } 132 133 struct macsec_cb { 134 struct aead_request *req; 135 union { 136 struct macsec_tx_sa *tx_sa; 137 struct macsec_rx_sa *rx_sa; 138 }; 139 u8 assoc_num; 140 bool valid; 141 bool has_sci; 142 }; 143 144 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr) 145 { 146 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr); 147 148 if (!sa || !sa->active) 149 return NULL; 150 151 if (!refcount_inc_not_zero(&sa->refcnt)) 152 return NULL; 153 154 return sa; 155 } 156 157 static struct macsec_rx_sa *macsec_active_rxsa_get(struct macsec_rx_sc *rx_sc) 158 { 159 struct macsec_rx_sa *sa = NULL; 160 int an; 161 162 for (an = 0; an < MACSEC_NUM_AN; an++) { 163 sa = macsec_rxsa_get(rx_sc->sa[an]); 164 if (sa) 165 break; 166 } 167 return sa; 168 } 169 170 static void free_rx_sc_rcu(struct rcu_head *head) 171 { 172 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head); 173 174 free_percpu(rx_sc->stats); 175 kfree(rx_sc); 176 } 177 178 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc) 179 { 180 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL; 181 } 182 183 static void macsec_rxsc_put(struct macsec_rx_sc *sc) 184 { 185 if (refcount_dec_and_test(&sc->refcnt)) 186 call_rcu(&sc->rcu_head, free_rx_sc_rcu); 187 } 188 189 static void free_rxsa(struct rcu_head *head) 190 { 191 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu); 192 193 crypto_free_aead(sa->key.tfm); 194 free_percpu(sa->stats); 195 kfree(sa); 196 } 197 198 static void macsec_rxsa_put(struct macsec_rx_sa *sa) 199 { 200 if (refcount_dec_and_test(&sa->refcnt)) 201 call_rcu(&sa->rcu, free_rxsa); 202 } 203 204 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr) 205 { 206 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr); 207 208 if (!sa || !sa->active) 209 return NULL; 210 211 if (!refcount_inc_not_zero(&sa->refcnt)) 212 return NULL; 213 214 return sa; 215 } 216 217 static void free_txsa(struct rcu_head *head) 218 { 219 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu); 220 221 crypto_free_aead(sa->key.tfm); 222 free_percpu(sa->stats); 223 kfree(sa); 224 } 225 226 static void macsec_txsa_put(struct macsec_tx_sa *sa) 227 { 228 if (refcount_dec_and_test(&sa->refcnt)) 229 call_rcu(&sa->rcu, free_txsa); 230 } 231 232 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) 233 { 234 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); 235 return (struct macsec_cb *)skb->cb; 236 } 237 238 #define MACSEC_PORT_SCB (0x0000) 239 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL) 240 #define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff) 241 242 #define MACSEC_GCM_AES_128_SAK_LEN 16 243 #define MACSEC_GCM_AES_256_SAK_LEN 32 244 245 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN 246 #define DEFAULT_XPN false 247 #define DEFAULT_SEND_SCI true 248 #define DEFAULT_ENCRYPT false 249 #define DEFAULT_ENCODING_SA 0 250 #define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1)) 251 252 static sci_t make_sci(const u8 *addr, __be16 port) 253 { 254 sci_t sci; 255 256 memcpy(&sci, addr, ETH_ALEN); 257 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); 258 259 return sci; 260 } 261 262 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present) 263 { 264 sci_t sci; 265 266 if (sci_present) 267 memcpy(&sci, hdr->secure_channel_id, 268 sizeof(hdr->secure_channel_id)); 269 else 270 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); 271 272 return sci; 273 } 274 275 static unsigned int macsec_sectag_len(bool sci_present) 276 { 277 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); 278 } 279 280 static unsigned int macsec_hdr_len(bool sci_present) 281 { 282 return macsec_sectag_len(sci_present) + ETH_HLEN; 283 } 284 285 static unsigned int macsec_extra_len(bool sci_present) 286 { 287 return macsec_sectag_len(sci_present) + sizeof(__be16); 288 } 289 290 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ 291 static void macsec_fill_sectag(struct macsec_eth_header *h, 292 const struct macsec_secy *secy, u32 pn, 293 bool sci_present) 294 { 295 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 296 297 memset(&h->tci_an, 0, macsec_sectag_len(sci_present)); 298 h->eth.h_proto = htons(ETH_P_MACSEC); 299 300 if (sci_present) { 301 h->tci_an |= MACSEC_TCI_SC; 302 memcpy(&h->secure_channel_id, &secy->sci, 303 sizeof(h->secure_channel_id)); 304 } else { 305 if (tx_sc->end_station) 306 h->tci_an |= MACSEC_TCI_ES; 307 if (tx_sc->scb) 308 h->tci_an |= MACSEC_TCI_SCB; 309 } 310 311 h->packet_number = htonl(pn); 312 313 /* with GCM, C/E clear for !encrypt, both set for encrypt */ 314 if (tx_sc->encrypt) 315 h->tci_an |= MACSEC_TCI_CONFID; 316 else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN) 317 h->tci_an |= MACSEC_TCI_C; 318 319 h->tci_an |= tx_sc->encoding_sa; 320 } 321 322 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) 323 { 324 if (data_len < MIN_NON_SHORT_LEN) 325 h->short_length = data_len; 326 } 327 328 /* Checks if a MACsec interface is being offloaded to an hardware engine */ 329 static bool macsec_is_offloaded(struct macsec_dev *macsec) 330 { 331 if (macsec->offload == MACSEC_OFFLOAD_MAC || 332 macsec->offload == MACSEC_OFFLOAD_PHY) 333 return true; 334 335 return false; 336 } 337 338 /* Checks if underlying layers implement MACsec offloading functions. */ 339 static bool macsec_check_offload(enum macsec_offload offload, 340 struct macsec_dev *macsec) 341 { 342 if (!macsec || !macsec->real_dev) 343 return false; 344 345 if (offload == MACSEC_OFFLOAD_PHY) 346 return macsec->real_dev->phydev && 347 macsec->real_dev->phydev->macsec_ops; 348 else if (offload == MACSEC_OFFLOAD_MAC) 349 return macsec->real_dev->features & NETIF_F_HW_MACSEC && 350 macsec->real_dev->macsec_ops; 351 352 return false; 353 } 354 355 static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload, 356 struct macsec_dev *macsec, 357 struct macsec_context *ctx) 358 { 359 if (ctx) { 360 memset(ctx, 0, sizeof(*ctx)); 361 ctx->offload = offload; 362 363 if (offload == MACSEC_OFFLOAD_PHY) 364 ctx->phydev = macsec->real_dev->phydev; 365 else if (offload == MACSEC_OFFLOAD_MAC) 366 ctx->netdev = macsec->real_dev; 367 } 368 369 if (offload == MACSEC_OFFLOAD_PHY) 370 return macsec->real_dev->phydev->macsec_ops; 371 else 372 return macsec->real_dev->macsec_ops; 373 } 374 375 /* Returns a pointer to the MACsec ops struct if any and updates the MACsec 376 * context device reference if provided. 377 */ 378 static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec, 379 struct macsec_context *ctx) 380 { 381 if (!macsec_check_offload(macsec->offload, macsec)) 382 return NULL; 383 384 return __macsec_get_ops(macsec->offload, macsec, ctx); 385 } 386 387 /* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */ 388 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn) 389 { 390 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; 391 int len = skb->len - 2 * ETH_ALEN; 392 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; 393 394 /* a) It comprises at least 17 octets */ 395 if (skb->len <= 16) 396 return false; 397 398 /* b) MACsec EtherType: already checked */ 399 400 /* c) V bit is clear */ 401 if (h->tci_an & MACSEC_TCI_VERSION) 402 return false; 403 404 /* d) ES or SCB => !SC */ 405 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && 406 (h->tci_an & MACSEC_TCI_SC)) 407 return false; 408 409 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ 410 if (h->unused) 411 return false; 412 413 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */ 414 if (!h->packet_number && !xpn) 415 return false; 416 417 /* length check, f) g) h) i) */ 418 if (h->short_length) 419 return len == extra_len + h->short_length; 420 return len >= extra_len + MIN_NON_SHORT_LEN; 421 } 422 423 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) 424 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN 425 426 static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn, 427 salt_t salt) 428 { 429 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv; 430 431 gcm_iv->ssci = ssci ^ salt.ssci; 432 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn; 433 } 434 435 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) 436 { 437 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; 438 439 gcm_iv->sci = sci; 440 gcm_iv->pn = htonl(pn); 441 } 442 443 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) 444 { 445 return (struct macsec_eth_header *)skb_mac_header(skb); 446 } 447 448 static void __macsec_pn_wrapped(struct macsec_secy *secy, 449 struct macsec_tx_sa *tx_sa) 450 { 451 pr_debug("PN wrapped, transitioning to !oper\n"); 452 tx_sa->active = false; 453 if (secy->protect_frames) 454 secy->operational = false; 455 } 456 457 void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa) 458 { 459 spin_lock_bh(&tx_sa->lock); 460 __macsec_pn_wrapped(secy, tx_sa); 461 spin_unlock_bh(&tx_sa->lock); 462 } 463 EXPORT_SYMBOL_GPL(macsec_pn_wrapped); 464 465 static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa, 466 struct macsec_secy *secy) 467 { 468 pn_t pn; 469 470 spin_lock_bh(&tx_sa->lock); 471 472 pn = tx_sa->next_pn_halves; 473 if (secy->xpn) 474 tx_sa->next_pn++; 475 else 476 tx_sa->next_pn_halves.lower++; 477 478 if (tx_sa->next_pn == 0) 479 __macsec_pn_wrapped(secy, tx_sa); 480 spin_unlock_bh(&tx_sa->lock); 481 482 return pn; 483 } 484 485 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) 486 { 487 struct macsec_dev *macsec = netdev_priv(dev); 488 489 skb->dev = macsec->real_dev; 490 skb_reset_mac_header(skb); 491 skb->protocol = eth_hdr(skb)->h_proto; 492 } 493 494 static unsigned int macsec_msdu_len(struct sk_buff *skb) 495 { 496 struct macsec_dev *macsec = macsec_priv(skb->dev); 497 struct macsec_secy *secy = &macsec->secy; 498 bool sci_present = macsec_skb_cb(skb)->has_sci; 499 500 return skb->len - macsec_hdr_len(sci_present) - secy->icv_len; 501 } 502 503 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, 504 struct macsec_tx_sa *tx_sa) 505 { 506 unsigned int msdu_len = macsec_msdu_len(skb); 507 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); 508 509 u64_stats_update_begin(&txsc_stats->syncp); 510 if (tx_sc->encrypt) { 511 txsc_stats->stats.OutOctetsEncrypted += msdu_len; 512 txsc_stats->stats.OutPktsEncrypted++; 513 this_cpu_inc(tx_sa->stats->OutPktsEncrypted); 514 } else { 515 txsc_stats->stats.OutOctetsProtected += msdu_len; 516 txsc_stats->stats.OutPktsProtected++; 517 this_cpu_inc(tx_sa->stats->OutPktsProtected); 518 } 519 u64_stats_update_end(&txsc_stats->syncp); 520 } 521 522 static void count_tx(struct net_device *dev, int ret, int len) 523 { 524 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) 525 dev_sw_netstats_tx_add(dev, 1, len); 526 } 527 528 static void macsec_encrypt_done(void *data, int err) 529 { 530 struct sk_buff *skb = data; 531 struct net_device *dev = skb->dev; 532 struct macsec_dev *macsec = macsec_priv(dev); 533 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 534 int len, ret; 535 536 aead_request_free(macsec_skb_cb(skb)->req); 537 538 rcu_read_lock_bh(); 539 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 540 /* packet is encrypted/protected so tx_bytes must be calculated */ 541 len = macsec_msdu_len(skb) + 2 * ETH_ALEN; 542 macsec_encrypt_finish(skb, dev); 543 ret = dev_queue_xmit(skb); 544 count_tx(dev, ret, len); 545 rcu_read_unlock_bh(); 546 547 macsec_txsa_put(sa); 548 dev_put(dev); 549 } 550 551 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, 552 unsigned char **iv, 553 struct scatterlist **sg, 554 int num_frags) 555 { 556 size_t size, iv_offset, sg_offset; 557 struct aead_request *req; 558 void *tmp; 559 560 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); 561 iv_offset = size; 562 size += GCM_AES_IV_LEN; 563 564 size = ALIGN(size, __alignof__(struct scatterlist)); 565 sg_offset = size; 566 size += sizeof(struct scatterlist) * num_frags; 567 568 tmp = kmalloc(size, GFP_ATOMIC); 569 if (!tmp) 570 return NULL; 571 572 *iv = (unsigned char *)(tmp + iv_offset); 573 *sg = (struct scatterlist *)(tmp + sg_offset); 574 req = tmp; 575 576 aead_request_set_tfm(req, tfm); 577 578 return req; 579 } 580 581 static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 582 struct net_device *dev) 583 { 584 int ret; 585 struct scatterlist *sg; 586 struct sk_buff *trailer; 587 unsigned char *iv; 588 struct ethhdr *eth; 589 struct macsec_eth_header *hh; 590 size_t unprotected_len; 591 struct aead_request *req; 592 struct macsec_secy *secy; 593 struct macsec_tx_sc *tx_sc; 594 struct macsec_tx_sa *tx_sa; 595 struct macsec_dev *macsec = macsec_priv(dev); 596 bool sci_present; 597 pn_t pn; 598 599 secy = &macsec->secy; 600 tx_sc = &secy->tx_sc; 601 602 /* 10.5.1 TX SA assignment */ 603 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); 604 if (!tx_sa) { 605 secy->operational = false; 606 kfree_skb(skb); 607 return ERR_PTR(-EINVAL); 608 } 609 610 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || 611 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { 612 struct sk_buff *nskb = skb_copy_expand(skb, 613 MACSEC_NEEDED_HEADROOM, 614 MACSEC_NEEDED_TAILROOM, 615 GFP_ATOMIC); 616 if (likely(nskb)) { 617 consume_skb(skb); 618 skb = nskb; 619 } else { 620 macsec_txsa_put(tx_sa); 621 kfree_skb(skb); 622 return ERR_PTR(-ENOMEM); 623 } 624 } else { 625 skb = skb_unshare(skb, GFP_ATOMIC); 626 if (!skb) { 627 macsec_txsa_put(tx_sa); 628 return ERR_PTR(-ENOMEM); 629 } 630 } 631 632 unprotected_len = skb->len; 633 eth = eth_hdr(skb); 634 sci_present = macsec_send_sci(secy); 635 hh = skb_push(skb, macsec_extra_len(sci_present)); 636 memmove(hh, eth, 2 * ETH_ALEN); 637 638 pn = tx_sa_update_pn(tx_sa, secy); 639 if (pn.full64 == 0) { 640 macsec_txsa_put(tx_sa); 641 kfree_skb(skb); 642 return ERR_PTR(-ENOLINK); 643 } 644 macsec_fill_sectag(hh, secy, pn.lower, sci_present); 645 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); 646 647 skb_put(skb, secy->icv_len); 648 649 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { 650 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 651 652 u64_stats_update_begin(&secy_stats->syncp); 653 secy_stats->stats.OutPktsTooLong++; 654 u64_stats_update_end(&secy_stats->syncp); 655 656 macsec_txsa_put(tx_sa); 657 kfree_skb(skb); 658 return ERR_PTR(-EINVAL); 659 } 660 661 ret = skb_cow_data(skb, 0, &trailer); 662 if (unlikely(ret < 0)) { 663 macsec_txsa_put(tx_sa); 664 kfree_skb(skb); 665 return ERR_PTR(ret); 666 } 667 668 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret); 669 if (!req) { 670 macsec_txsa_put(tx_sa); 671 kfree_skb(skb); 672 return ERR_PTR(-ENOMEM); 673 } 674 675 if (secy->xpn) 676 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt); 677 else 678 macsec_fill_iv(iv, secy->sci, pn.lower); 679 680 sg_init_table(sg, ret); 681 ret = skb_to_sgvec(skb, sg, 0, skb->len); 682 if (unlikely(ret < 0)) { 683 aead_request_free(req); 684 macsec_txsa_put(tx_sa); 685 kfree_skb(skb); 686 return ERR_PTR(ret); 687 } 688 689 if (tx_sc->encrypt) { 690 int len = skb->len - macsec_hdr_len(sci_present) - 691 secy->icv_len; 692 aead_request_set_crypt(req, sg, sg, len, iv); 693 aead_request_set_ad(req, macsec_hdr_len(sci_present)); 694 } else { 695 aead_request_set_crypt(req, sg, sg, 0, iv); 696 aead_request_set_ad(req, skb->len - secy->icv_len); 697 } 698 699 macsec_skb_cb(skb)->req = req; 700 macsec_skb_cb(skb)->tx_sa = tx_sa; 701 macsec_skb_cb(skb)->has_sci = sci_present; 702 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 703 704 dev_hold(skb->dev); 705 ret = crypto_aead_encrypt(req); 706 if (ret == -EINPROGRESS) { 707 return ERR_PTR(ret); 708 } else if (ret != 0) { 709 dev_put(skb->dev); 710 kfree_skb(skb); 711 aead_request_free(req); 712 macsec_txsa_put(tx_sa); 713 return ERR_PTR(-EINVAL); 714 } 715 716 dev_put(skb->dev); 717 aead_request_free(req); 718 macsec_txsa_put(tx_sa); 719 720 return skb; 721 } 722 723 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 724 { 725 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 726 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 727 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 728 u32 lowest_pn = 0; 729 730 spin_lock(&rx_sa->lock); 731 if (rx_sa->next_pn_halves.lower >= secy->replay_window) 732 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window; 733 734 /* Now perform replay protection check again 735 * (see IEEE 802.1AE-2006 figure 10-5) 736 */ 737 if (secy->replay_protect && pn < lowest_pn && 738 (!secy->xpn || pn_same_half(pn, lowest_pn))) { 739 spin_unlock(&rx_sa->lock); 740 u64_stats_update_begin(&rxsc_stats->syncp); 741 rxsc_stats->stats.InPktsLate++; 742 u64_stats_update_end(&rxsc_stats->syncp); 743 DEV_STATS_INC(secy->netdev, rx_dropped); 744 return false; 745 } 746 747 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 748 unsigned int msdu_len = macsec_msdu_len(skb); 749 u64_stats_update_begin(&rxsc_stats->syncp); 750 if (hdr->tci_an & MACSEC_TCI_E) 751 rxsc_stats->stats.InOctetsDecrypted += msdu_len; 752 else 753 rxsc_stats->stats.InOctetsValidated += msdu_len; 754 u64_stats_update_end(&rxsc_stats->syncp); 755 } 756 757 if (!macsec_skb_cb(skb)->valid) { 758 spin_unlock(&rx_sa->lock); 759 760 /* 10.6.5 */ 761 if (hdr->tci_an & MACSEC_TCI_C || 762 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 763 u64_stats_update_begin(&rxsc_stats->syncp); 764 rxsc_stats->stats.InPktsNotValid++; 765 u64_stats_update_end(&rxsc_stats->syncp); 766 this_cpu_inc(rx_sa->stats->InPktsNotValid); 767 DEV_STATS_INC(secy->netdev, rx_errors); 768 return false; 769 } 770 771 u64_stats_update_begin(&rxsc_stats->syncp); 772 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 773 rxsc_stats->stats.InPktsInvalid++; 774 this_cpu_inc(rx_sa->stats->InPktsInvalid); 775 } else if (pn < lowest_pn) { 776 rxsc_stats->stats.InPktsDelayed++; 777 } else { 778 rxsc_stats->stats.InPktsUnchecked++; 779 } 780 u64_stats_update_end(&rxsc_stats->syncp); 781 } else { 782 u64_stats_update_begin(&rxsc_stats->syncp); 783 if (pn < lowest_pn) { 784 rxsc_stats->stats.InPktsDelayed++; 785 } else { 786 rxsc_stats->stats.InPktsOK++; 787 this_cpu_inc(rx_sa->stats->InPktsOK); 788 } 789 u64_stats_update_end(&rxsc_stats->syncp); 790 791 // Instead of "pn >=" - to support pn overflow in xpn 792 if (pn + 1 > rx_sa->next_pn_halves.lower) { 793 rx_sa->next_pn_halves.lower = pn + 1; 794 } else if (secy->xpn && 795 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) { 796 rx_sa->next_pn_halves.upper++; 797 rx_sa->next_pn_halves.lower = pn + 1; 798 } 799 800 spin_unlock(&rx_sa->lock); 801 } 802 803 return true; 804 } 805 806 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 807 { 808 skb->pkt_type = PACKET_HOST; 809 skb->protocol = eth_type_trans(skb, dev); 810 811 skb_reset_network_header(skb); 812 if (!skb_transport_header_was_set(skb)) 813 skb_reset_transport_header(skb); 814 skb_reset_mac_len(skb); 815 } 816 817 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 818 { 819 skb->ip_summed = CHECKSUM_NONE; 820 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 821 skb_pull(skb, hdr_len); 822 pskb_trim_unique(skb, skb->len - icv_len); 823 } 824 825 static void count_rx(struct net_device *dev, int len) 826 { 827 dev_sw_netstats_rx_add(dev, len); 828 } 829 830 static void macsec_decrypt_done(void *data, int err) 831 { 832 struct sk_buff *skb = data; 833 struct net_device *dev = skb->dev; 834 struct macsec_dev *macsec = macsec_priv(dev); 835 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 836 struct macsec_rx_sc *rx_sc = rx_sa->sc; 837 int len; 838 u32 pn; 839 840 aead_request_free(macsec_skb_cb(skb)->req); 841 842 if (!err) 843 macsec_skb_cb(skb)->valid = true; 844 845 rcu_read_lock_bh(); 846 pn = ntohl(macsec_ethhdr(skb)->packet_number); 847 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 848 rcu_read_unlock_bh(); 849 kfree_skb(skb); 850 goto out; 851 } 852 853 macsec_finalize_skb(skb, macsec->secy.icv_len, 854 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 855 len = skb->len; 856 macsec_reset_skb(skb, macsec->secy.netdev); 857 858 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS) 859 count_rx(dev, len); 860 861 rcu_read_unlock_bh(); 862 863 out: 864 macsec_rxsa_put(rx_sa); 865 macsec_rxsc_put(rx_sc); 866 dev_put(dev); 867 } 868 869 static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 870 struct net_device *dev, 871 struct macsec_rx_sa *rx_sa, 872 sci_t sci, 873 struct macsec_secy *secy) 874 { 875 int ret; 876 struct scatterlist *sg; 877 struct sk_buff *trailer; 878 unsigned char *iv; 879 struct aead_request *req; 880 struct macsec_eth_header *hdr; 881 u32 hdr_pn; 882 u16 icv_len = secy->icv_len; 883 884 macsec_skb_cb(skb)->valid = false; 885 skb = skb_share_check(skb, GFP_ATOMIC); 886 if (!skb) 887 return ERR_PTR(-ENOMEM); 888 889 ret = skb_cow_data(skb, 0, &trailer); 890 if (unlikely(ret < 0)) { 891 kfree_skb(skb); 892 return ERR_PTR(ret); 893 } 894 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret); 895 if (!req) { 896 kfree_skb(skb); 897 return ERR_PTR(-ENOMEM); 898 } 899 900 hdr = (struct macsec_eth_header *)skb->data; 901 hdr_pn = ntohl(hdr->packet_number); 902 903 if (secy->xpn) { 904 pn_t recovered_pn = rx_sa->next_pn_halves; 905 906 recovered_pn.lower = hdr_pn; 907 if (hdr_pn < rx_sa->next_pn_halves.lower && 908 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower)) 909 recovered_pn.upper++; 910 911 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64, 912 rx_sa->key.salt); 913 } else { 914 macsec_fill_iv(iv, sci, hdr_pn); 915 } 916 917 sg_init_table(sg, ret); 918 ret = skb_to_sgvec(skb, sg, 0, skb->len); 919 if (unlikely(ret < 0)) { 920 aead_request_free(req); 921 kfree_skb(skb); 922 return ERR_PTR(ret); 923 } 924 925 if (hdr->tci_an & MACSEC_TCI_E) { 926 /* confidentiality: ethernet + macsec header 927 * authenticated, encrypted payload 928 */ 929 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 930 931 aead_request_set_crypt(req, sg, sg, len, iv); 932 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 933 skb = skb_unshare(skb, GFP_ATOMIC); 934 if (!skb) { 935 aead_request_free(req); 936 return ERR_PTR(-ENOMEM); 937 } 938 } else { 939 /* integrity only: all headers + data authenticated */ 940 aead_request_set_crypt(req, sg, sg, icv_len, iv); 941 aead_request_set_ad(req, skb->len - icv_len); 942 } 943 944 macsec_skb_cb(skb)->req = req; 945 skb->dev = dev; 946 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 947 948 dev_hold(dev); 949 ret = crypto_aead_decrypt(req); 950 if (ret == -EINPROGRESS) { 951 return ERR_PTR(ret); 952 } else if (ret != 0) { 953 /* decryption/authentication failed 954 * 10.6 if validateFrames is disabled, deliver anyway 955 */ 956 if (ret != -EBADMSG) { 957 kfree_skb(skb); 958 skb = ERR_PTR(ret); 959 } 960 } else { 961 macsec_skb_cb(skb)->valid = true; 962 } 963 dev_put(dev); 964 965 aead_request_free(req); 966 967 return skb; 968 } 969 970 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 971 { 972 struct macsec_rx_sc *rx_sc; 973 974 for_each_rxsc(secy, rx_sc) { 975 if (rx_sc->sci == sci) 976 return rx_sc; 977 } 978 979 return NULL; 980 } 981 982 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 983 { 984 struct macsec_rx_sc *rx_sc; 985 986 for_each_rxsc_rtnl(secy, rx_sc) { 987 if (rx_sc->sci == sci) 988 return rx_sc; 989 } 990 991 return NULL; 992 } 993 994 static enum rx_handler_result handle_not_macsec(struct sk_buff *skb) 995 { 996 /* Deliver to the uncontrolled port by default */ 997 enum rx_handler_result ret = RX_HANDLER_PASS; 998 struct ethhdr *hdr = eth_hdr(skb); 999 struct metadata_dst *md_dst; 1000 struct macsec_rxh_data *rxd; 1001 struct macsec_dev *macsec; 1002 bool is_macsec_md_dst; 1003 1004 rcu_read_lock(); 1005 rxd = macsec_data_rcu(skb->dev); 1006 md_dst = skb_metadata_dst(skb); 1007 is_macsec_md_dst = md_dst && md_dst->type == METADATA_MACSEC; 1008 1009 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1010 struct sk_buff *nskb; 1011 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 1012 struct net_device *ndev = macsec->secy.netdev; 1013 1014 /* If h/w offloading is enabled, HW decodes frames and strips 1015 * the SecTAG, so we have to deduce which port to deliver to. 1016 */ 1017 if (macsec_is_offloaded(macsec) && netif_running(ndev)) { 1018 const struct macsec_ops *ops; 1019 1020 ops = macsec_get_ops(macsec, NULL); 1021 1022 if (ops->rx_uses_md_dst && !is_macsec_md_dst) 1023 continue; 1024 1025 if (is_macsec_md_dst) { 1026 struct macsec_rx_sc *rx_sc; 1027 1028 /* All drivers that implement MACsec offload 1029 * support using skb metadata destinations must 1030 * indicate that they do so. 1031 */ 1032 DEBUG_NET_WARN_ON_ONCE(!ops->rx_uses_md_dst); 1033 rx_sc = find_rx_sc(&macsec->secy, 1034 md_dst->u.macsec_info.sci); 1035 if (!rx_sc) 1036 continue; 1037 /* device indicated macsec offload occurred */ 1038 skb->dev = ndev; 1039 skb->pkt_type = PACKET_HOST; 1040 eth_skb_pkt_type(skb, ndev); 1041 ret = RX_HANDLER_ANOTHER; 1042 goto out; 1043 } 1044 1045 /* This datapath is insecure because it is unable to 1046 * enforce isolation of broadcast/multicast traffic and 1047 * unicast traffic with promiscuous mode on the macsec 1048 * netdev. Since the core stack has no mechanism to 1049 * check that the hardware did indeed receive MACsec 1050 * traffic, it is possible that the response handling 1051 * done by the MACsec port was to a plaintext packet. 1052 * This violates the MACsec protocol standard. 1053 */ 1054 if (ether_addr_equal_64bits(hdr->h_dest, 1055 ndev->dev_addr)) { 1056 /* exact match, divert skb to this port */ 1057 skb->dev = ndev; 1058 skb->pkt_type = PACKET_HOST; 1059 ret = RX_HANDLER_ANOTHER; 1060 goto out; 1061 } else if (is_multicast_ether_addr_64bits( 1062 hdr->h_dest)) { 1063 /* multicast frame, deliver on this port too */ 1064 nskb = skb_clone(skb, GFP_ATOMIC); 1065 if (!nskb) 1066 break; 1067 1068 nskb->dev = ndev; 1069 eth_skb_pkt_type(nskb, ndev); 1070 1071 __netif_rx(nskb); 1072 } else if (ndev->flags & IFF_PROMISC) { 1073 skb->dev = ndev; 1074 skb->pkt_type = PACKET_HOST; 1075 ret = RX_HANDLER_ANOTHER; 1076 goto out; 1077 } 1078 1079 continue; 1080 } 1081 1082 /* 10.6 If the management control validateFrames is not 1083 * Strict, frames without a SecTAG are received, counted, and 1084 * delivered to the Controlled Port 1085 */ 1086 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1087 u64_stats_update_begin(&secy_stats->syncp); 1088 secy_stats->stats.InPktsNoTag++; 1089 u64_stats_update_end(&secy_stats->syncp); 1090 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1091 continue; 1092 } 1093 1094 /* deliver on this port */ 1095 nskb = skb_clone(skb, GFP_ATOMIC); 1096 if (!nskb) 1097 break; 1098 1099 nskb->dev = ndev; 1100 1101 if (__netif_rx(nskb) == NET_RX_SUCCESS) { 1102 u64_stats_update_begin(&secy_stats->syncp); 1103 secy_stats->stats.InPktsUntagged++; 1104 u64_stats_update_end(&secy_stats->syncp); 1105 } 1106 } 1107 1108 out: 1109 rcu_read_unlock(); 1110 return ret; 1111 } 1112 1113 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 1114 { 1115 struct sk_buff *skb = *pskb; 1116 struct net_device *dev = skb->dev; 1117 struct macsec_eth_header *hdr; 1118 struct macsec_secy *secy = NULL; 1119 struct macsec_rx_sc *rx_sc; 1120 struct macsec_rx_sa *rx_sa; 1121 struct macsec_rxh_data *rxd; 1122 struct macsec_dev *macsec; 1123 unsigned int len; 1124 sci_t sci; 1125 u32 hdr_pn; 1126 bool cbit; 1127 struct pcpu_rx_sc_stats *rxsc_stats; 1128 struct pcpu_secy_stats *secy_stats; 1129 bool pulled_sci; 1130 int ret; 1131 1132 if (skb_headroom(skb) < ETH_HLEN) 1133 goto drop_direct; 1134 1135 hdr = macsec_ethhdr(skb); 1136 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) 1137 return handle_not_macsec(skb); 1138 1139 skb = skb_unshare(skb, GFP_ATOMIC); 1140 *pskb = skb; 1141 if (!skb) 1142 return RX_HANDLER_CONSUMED; 1143 1144 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1145 if (!pulled_sci) { 1146 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1147 goto drop_direct; 1148 } 1149 1150 hdr = macsec_ethhdr(skb); 1151 1152 /* Frames with a SecTAG that has the TCI E bit set but the C 1153 * bit clear are discarded, as this reserved encoding is used 1154 * to identify frames with a SecTAG that are not to be 1155 * delivered to the Controlled Port. 1156 */ 1157 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1158 return RX_HANDLER_PASS; 1159 1160 /* now, pull the extra length */ 1161 if (hdr->tci_an & MACSEC_TCI_SC) { 1162 if (!pulled_sci) 1163 goto drop_direct; 1164 } 1165 1166 /* ethernet header is part of crypto processing */ 1167 skb_push(skb, ETH_HLEN); 1168 1169 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1170 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1171 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci); 1172 1173 rcu_read_lock(); 1174 rxd = macsec_data_rcu(skb->dev); 1175 1176 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1177 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1178 1179 sc = sc ? macsec_rxsc_get(sc) : NULL; 1180 1181 if (sc) { 1182 secy = &macsec->secy; 1183 rx_sc = sc; 1184 break; 1185 } 1186 } 1187 1188 if (!secy) 1189 goto nosci; 1190 1191 dev = secy->netdev; 1192 macsec = macsec_priv(dev); 1193 secy_stats = this_cpu_ptr(macsec->stats); 1194 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1195 1196 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) { 1197 u64_stats_update_begin(&secy_stats->syncp); 1198 secy_stats->stats.InPktsBadTag++; 1199 u64_stats_update_end(&secy_stats->syncp); 1200 DEV_STATS_INC(secy->netdev, rx_errors); 1201 goto drop_nosa; 1202 } 1203 1204 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1205 if (!rx_sa) { 1206 /* 10.6.1 if the SA is not in use */ 1207 1208 /* If validateFrames is Strict or the C bit in the 1209 * SecTAG is set, discard 1210 */ 1211 struct macsec_rx_sa *active_rx_sa = macsec_active_rxsa_get(rx_sc); 1212 if (hdr->tci_an & MACSEC_TCI_C || 1213 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1214 u64_stats_update_begin(&rxsc_stats->syncp); 1215 rxsc_stats->stats.InPktsNotUsingSA++; 1216 u64_stats_update_end(&rxsc_stats->syncp); 1217 DEV_STATS_INC(secy->netdev, rx_errors); 1218 if (active_rx_sa) 1219 this_cpu_inc(active_rx_sa->stats->InPktsNotUsingSA); 1220 goto drop_nosa; 1221 } 1222 1223 /* not Strict, the frame (with the SecTAG and ICV 1224 * removed) is delivered to the Controlled Port. 1225 */ 1226 u64_stats_update_begin(&rxsc_stats->syncp); 1227 rxsc_stats->stats.InPktsUnusedSA++; 1228 u64_stats_update_end(&rxsc_stats->syncp); 1229 if (active_rx_sa) 1230 this_cpu_inc(active_rx_sa->stats->InPktsUnusedSA); 1231 goto deliver; 1232 } 1233 1234 /* First, PN check to avoid decrypting obviously wrong packets */ 1235 hdr_pn = ntohl(hdr->packet_number); 1236 if (secy->replay_protect) { 1237 bool late; 1238 1239 spin_lock(&rx_sa->lock); 1240 late = rx_sa->next_pn_halves.lower >= secy->replay_window && 1241 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window); 1242 1243 if (secy->xpn) 1244 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn); 1245 spin_unlock(&rx_sa->lock); 1246 1247 if (late) { 1248 u64_stats_update_begin(&rxsc_stats->syncp); 1249 rxsc_stats->stats.InPktsLate++; 1250 u64_stats_update_end(&rxsc_stats->syncp); 1251 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1252 goto drop; 1253 } 1254 } 1255 1256 macsec_skb_cb(skb)->rx_sa = rx_sa; 1257 1258 /* Disabled && !changed text => skip validation */ 1259 if (hdr->tci_an & MACSEC_TCI_C || 1260 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1261 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1262 1263 if (IS_ERR(skb)) { 1264 /* the decrypt callback needs the reference */ 1265 if (PTR_ERR(skb) != -EINPROGRESS) { 1266 macsec_rxsa_put(rx_sa); 1267 macsec_rxsc_put(rx_sc); 1268 } 1269 rcu_read_unlock(); 1270 *pskb = NULL; 1271 return RX_HANDLER_CONSUMED; 1272 } 1273 1274 if (!macsec_post_decrypt(skb, secy, hdr_pn)) 1275 goto drop; 1276 1277 deliver: 1278 macsec_finalize_skb(skb, secy->icv_len, 1279 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1280 len = skb->len; 1281 macsec_reset_skb(skb, secy->netdev); 1282 1283 if (rx_sa) 1284 macsec_rxsa_put(rx_sa); 1285 macsec_rxsc_put(rx_sc); 1286 1287 skb_orphan(skb); 1288 ret = gro_cells_receive(&macsec->gro_cells, skb); 1289 if (ret == NET_RX_SUCCESS) 1290 count_rx(dev, len); 1291 else 1292 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1293 1294 rcu_read_unlock(); 1295 1296 *pskb = NULL; 1297 return RX_HANDLER_CONSUMED; 1298 1299 drop: 1300 macsec_rxsa_put(rx_sa); 1301 drop_nosa: 1302 macsec_rxsc_put(rx_sc); 1303 rcu_read_unlock(); 1304 drop_direct: 1305 kfree_skb(skb); 1306 *pskb = NULL; 1307 return RX_HANDLER_CONSUMED; 1308 1309 nosci: 1310 /* 10.6.1 if the SC is not found */ 1311 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1312 if (!cbit) 1313 macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN, 1314 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1315 1316 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1317 struct sk_buff *nskb; 1318 1319 secy_stats = this_cpu_ptr(macsec->stats); 1320 1321 /* If validateFrames is Strict or the C bit in the 1322 * SecTAG is set, discard 1323 */ 1324 if (cbit || 1325 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1326 u64_stats_update_begin(&secy_stats->syncp); 1327 secy_stats->stats.InPktsNoSCI++; 1328 u64_stats_update_end(&secy_stats->syncp); 1329 DEV_STATS_INC(macsec->secy.netdev, rx_errors); 1330 continue; 1331 } 1332 1333 /* not strict, the frame (with the SecTAG and ICV 1334 * removed) is delivered to the Controlled Port. 1335 */ 1336 nskb = skb_clone(skb, GFP_ATOMIC); 1337 if (!nskb) 1338 break; 1339 1340 macsec_reset_skb(nskb, macsec->secy.netdev); 1341 1342 ret = __netif_rx(nskb); 1343 if (ret == NET_RX_SUCCESS) { 1344 u64_stats_update_begin(&secy_stats->syncp); 1345 secy_stats->stats.InPktsUnknownSCI++; 1346 u64_stats_update_end(&secy_stats->syncp); 1347 } else { 1348 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1349 } 1350 } 1351 1352 rcu_read_unlock(); 1353 *pskb = skb; 1354 return RX_HANDLER_PASS; 1355 } 1356 1357 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1358 { 1359 struct crypto_aead *tfm; 1360 int ret; 1361 1362 tfm = crypto_alloc_aead("gcm(aes)", 0, 0); 1363 1364 if (IS_ERR(tfm)) 1365 return tfm; 1366 1367 ret = crypto_aead_setkey(tfm, key, key_len); 1368 if (ret < 0) 1369 goto fail; 1370 1371 ret = crypto_aead_setauthsize(tfm, icv_len); 1372 if (ret < 0) 1373 goto fail; 1374 1375 return tfm; 1376 fail: 1377 crypto_free_aead(tfm); 1378 return ERR_PTR(ret); 1379 } 1380 1381 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1382 int icv_len) 1383 { 1384 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1385 if (!rx_sa->stats) 1386 return -ENOMEM; 1387 1388 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1389 if (IS_ERR(rx_sa->key.tfm)) { 1390 free_percpu(rx_sa->stats); 1391 return PTR_ERR(rx_sa->key.tfm); 1392 } 1393 1394 rx_sa->ssci = MACSEC_UNDEF_SSCI; 1395 rx_sa->active = false; 1396 rx_sa->next_pn = 1; 1397 refcount_set(&rx_sa->refcnt, 1); 1398 spin_lock_init(&rx_sa->lock); 1399 1400 return 0; 1401 } 1402 1403 static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1404 { 1405 rx_sa->active = false; 1406 1407 macsec_rxsa_put(rx_sa); 1408 } 1409 1410 static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1411 { 1412 int i; 1413 1414 for (i = 0; i < MACSEC_NUM_AN; i++) { 1415 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1416 1417 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1418 if (sa) 1419 clear_rx_sa(sa); 1420 } 1421 1422 macsec_rxsc_put(rx_sc); 1423 } 1424 1425 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1426 { 1427 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1428 1429 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1430 rx_sc; 1431 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1432 if (rx_sc->sci == sci) { 1433 if (rx_sc->active) 1434 secy->n_rx_sc--; 1435 rcu_assign_pointer(*rx_scp, rx_sc->next); 1436 return rx_sc; 1437 } 1438 } 1439 1440 return NULL; 1441 } 1442 1443 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci, 1444 bool active) 1445 { 1446 struct macsec_rx_sc *rx_sc; 1447 struct macsec_dev *macsec; 1448 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1449 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1450 struct macsec_secy *secy; 1451 1452 list_for_each_entry(macsec, &rxd->secys, secys) { 1453 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1454 return ERR_PTR(-EEXIST); 1455 } 1456 1457 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL); 1458 if (!rx_sc) 1459 return ERR_PTR(-ENOMEM); 1460 1461 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1462 if (!rx_sc->stats) { 1463 kfree(rx_sc); 1464 return ERR_PTR(-ENOMEM); 1465 } 1466 1467 rx_sc->sci = sci; 1468 rx_sc->active = active; 1469 refcount_set(&rx_sc->refcnt, 1); 1470 1471 secy = &macsec_priv(dev)->secy; 1472 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1473 rcu_assign_pointer(secy->rx_sc, rx_sc); 1474 1475 if (rx_sc->active) 1476 secy->n_rx_sc++; 1477 1478 return rx_sc; 1479 } 1480 1481 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1482 int icv_len) 1483 { 1484 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1485 if (!tx_sa->stats) 1486 return -ENOMEM; 1487 1488 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1489 if (IS_ERR(tx_sa->key.tfm)) { 1490 free_percpu(tx_sa->stats); 1491 return PTR_ERR(tx_sa->key.tfm); 1492 } 1493 1494 tx_sa->ssci = MACSEC_UNDEF_SSCI; 1495 tx_sa->active = false; 1496 refcount_set(&tx_sa->refcnt, 1); 1497 spin_lock_init(&tx_sa->lock); 1498 1499 return 0; 1500 } 1501 1502 static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1503 { 1504 tx_sa->active = false; 1505 1506 macsec_txsa_put(tx_sa); 1507 } 1508 1509 static struct genl_family macsec_fam; 1510 1511 static struct net_device *get_dev_from_nl(struct net *net, 1512 struct nlattr **attrs) 1513 { 1514 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1515 struct net_device *dev; 1516 1517 dev = __dev_get_by_index(net, ifindex); 1518 if (!dev) 1519 return ERR_PTR(-ENODEV); 1520 1521 if (!netif_is_macsec(dev)) 1522 return ERR_PTR(-ENODEV); 1523 1524 return dev; 1525 } 1526 1527 static enum macsec_offload nla_get_offload(const struct nlattr *nla) 1528 { 1529 return (__force enum macsec_offload)nla_get_u8(nla); 1530 } 1531 1532 static sci_t nla_get_sci(const struct nlattr *nla) 1533 { 1534 return (__force sci_t)nla_get_u64(nla); 1535 } 1536 1537 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, 1538 int padattr) 1539 { 1540 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); 1541 } 1542 1543 static ssci_t nla_get_ssci(const struct nlattr *nla) 1544 { 1545 return (__force ssci_t)nla_get_u32(nla); 1546 } 1547 1548 static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value) 1549 { 1550 return nla_put_u32(skb, attrtype, (__force u64)value); 1551 } 1552 1553 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1554 struct nlattr **attrs, 1555 struct nlattr **tb_sa, 1556 struct net_device **devp, 1557 struct macsec_secy **secyp, 1558 struct macsec_tx_sc **scp, 1559 u8 *assoc_num) 1560 { 1561 struct net_device *dev; 1562 struct macsec_secy *secy; 1563 struct macsec_tx_sc *tx_sc; 1564 struct macsec_tx_sa *tx_sa; 1565 1566 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1567 return ERR_PTR(-EINVAL); 1568 1569 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1570 1571 dev = get_dev_from_nl(net, attrs); 1572 if (IS_ERR(dev)) 1573 return ERR_CAST(dev); 1574 1575 if (*assoc_num >= MACSEC_NUM_AN) 1576 return ERR_PTR(-EINVAL); 1577 1578 secy = &macsec_priv(dev)->secy; 1579 tx_sc = &secy->tx_sc; 1580 1581 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1582 if (!tx_sa) 1583 return ERR_PTR(-ENODEV); 1584 1585 *devp = dev; 1586 *scp = tx_sc; 1587 *secyp = secy; 1588 return tx_sa; 1589 } 1590 1591 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1592 struct nlattr **attrs, 1593 struct nlattr **tb_rxsc, 1594 struct net_device **devp, 1595 struct macsec_secy **secyp) 1596 { 1597 struct net_device *dev; 1598 struct macsec_secy *secy; 1599 struct macsec_rx_sc *rx_sc; 1600 sci_t sci; 1601 1602 dev = get_dev_from_nl(net, attrs); 1603 if (IS_ERR(dev)) 1604 return ERR_CAST(dev); 1605 1606 secy = &macsec_priv(dev)->secy; 1607 1608 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1609 return ERR_PTR(-EINVAL); 1610 1611 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1612 rx_sc = find_rx_sc_rtnl(secy, sci); 1613 if (!rx_sc) 1614 return ERR_PTR(-ENODEV); 1615 1616 *secyp = secy; 1617 *devp = dev; 1618 1619 return rx_sc; 1620 } 1621 1622 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1623 struct nlattr **attrs, 1624 struct nlattr **tb_rxsc, 1625 struct nlattr **tb_sa, 1626 struct net_device **devp, 1627 struct macsec_secy **secyp, 1628 struct macsec_rx_sc **scp, 1629 u8 *assoc_num) 1630 { 1631 struct macsec_rx_sc *rx_sc; 1632 struct macsec_rx_sa *rx_sa; 1633 1634 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1635 return ERR_PTR(-EINVAL); 1636 1637 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1638 if (*assoc_num >= MACSEC_NUM_AN) 1639 return ERR_PTR(-EINVAL); 1640 1641 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1642 if (IS_ERR(rx_sc)) 1643 return ERR_CAST(rx_sc); 1644 1645 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1646 if (!rx_sa) 1647 return ERR_PTR(-ENODEV); 1648 1649 *scp = rx_sc; 1650 return rx_sa; 1651 } 1652 1653 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1654 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1655 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1656 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1657 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED }, 1658 }; 1659 1660 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1661 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1662 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, 1663 }; 1664 1665 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1666 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, 1667 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, 1668 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4), 1669 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY, 1670 .len = MACSEC_KEYID_LEN, }, 1671 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1672 .len = MACSEC_MAX_KEY_LEN, }, 1673 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 }, 1674 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY, 1675 .len = MACSEC_SALT_LEN, }, 1676 }; 1677 1678 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = { 1679 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 }, 1680 }; 1681 1682 /* Offloads an operation to a device driver */ 1683 static int macsec_offload(int (* const func)(struct macsec_context *), 1684 struct macsec_context *ctx) 1685 { 1686 int ret; 1687 1688 if (unlikely(!func)) 1689 return 0; 1690 1691 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1692 mutex_lock(&ctx->phydev->lock); 1693 1694 ret = (*func)(ctx); 1695 1696 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1697 mutex_unlock(&ctx->phydev->lock); 1698 1699 return ret; 1700 } 1701 1702 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1703 { 1704 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1705 return -EINVAL; 1706 1707 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL)) 1708 return -EINVAL; 1709 1710 return 0; 1711 } 1712 1713 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1714 { 1715 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1716 return -EINVAL; 1717 1718 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL)) 1719 return -EINVAL; 1720 1721 return 0; 1722 } 1723 1724 static bool validate_add_rxsa(struct nlattr **attrs) 1725 { 1726 if (!attrs[MACSEC_SA_ATTR_AN] || 1727 !attrs[MACSEC_SA_ATTR_KEY] || 1728 !attrs[MACSEC_SA_ATTR_KEYID]) 1729 return false; 1730 1731 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1732 return false; 1733 1734 if (attrs[MACSEC_SA_ATTR_PN] && 1735 nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 1736 return false; 1737 1738 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1739 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1740 return false; 1741 } 1742 1743 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1744 return false; 1745 1746 return true; 1747 } 1748 1749 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1750 { 1751 struct net_device *dev; 1752 struct nlattr **attrs = info->attrs; 1753 struct macsec_secy *secy; 1754 struct macsec_rx_sc *rx_sc; 1755 struct macsec_rx_sa *rx_sa; 1756 unsigned char assoc_num; 1757 int pn_len; 1758 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1759 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1760 int err; 1761 1762 if (!attrs[MACSEC_ATTR_IFINDEX]) 1763 return -EINVAL; 1764 1765 if (parse_sa_config(attrs, tb_sa)) 1766 return -EINVAL; 1767 1768 if (parse_rxsc_config(attrs, tb_rxsc)) 1769 return -EINVAL; 1770 1771 if (!validate_add_rxsa(tb_sa)) 1772 return -EINVAL; 1773 1774 rtnl_lock(); 1775 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1776 if (IS_ERR(rx_sc)) { 1777 rtnl_unlock(); 1778 return PTR_ERR(rx_sc); 1779 } 1780 1781 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1782 1783 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1784 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1785 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1786 rtnl_unlock(); 1787 return -EINVAL; 1788 } 1789 1790 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1791 if (tb_sa[MACSEC_SA_ATTR_PN] && 1792 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1793 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n", 1794 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1795 rtnl_unlock(); 1796 return -EINVAL; 1797 } 1798 1799 if (secy->xpn) { 1800 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 1801 rtnl_unlock(); 1802 return -EINVAL; 1803 } 1804 1805 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 1806 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n", 1807 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 1808 MACSEC_SALT_LEN); 1809 rtnl_unlock(); 1810 return -EINVAL; 1811 } 1812 } 1813 1814 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1815 if (rx_sa) { 1816 rtnl_unlock(); 1817 return -EBUSY; 1818 } 1819 1820 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1821 if (!rx_sa) { 1822 rtnl_unlock(); 1823 return -ENOMEM; 1824 } 1825 1826 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1827 secy->key_len, secy->icv_len); 1828 if (err < 0) { 1829 kfree(rx_sa); 1830 rtnl_unlock(); 1831 return err; 1832 } 1833 1834 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1835 spin_lock_bh(&rx_sa->lock); 1836 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 1837 spin_unlock_bh(&rx_sa->lock); 1838 } 1839 1840 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1841 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1842 1843 rx_sa->sc = rx_sc; 1844 1845 if (secy->xpn) { 1846 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 1847 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 1848 MACSEC_SALT_LEN); 1849 } 1850 1851 /* If h/w offloading is available, propagate to the device */ 1852 if (macsec_is_offloaded(netdev_priv(dev))) { 1853 const struct macsec_ops *ops; 1854 struct macsec_context ctx; 1855 1856 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1857 if (!ops) { 1858 err = -EOPNOTSUPP; 1859 goto cleanup; 1860 } 1861 1862 ctx.sa.assoc_num = assoc_num; 1863 ctx.sa.rx_sa = rx_sa; 1864 ctx.secy = secy; 1865 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1866 secy->key_len); 1867 1868 err = macsec_offload(ops->mdo_add_rxsa, &ctx); 1869 memzero_explicit(ctx.sa.key, secy->key_len); 1870 if (err) 1871 goto cleanup; 1872 } 1873 1874 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1875 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1876 1877 rtnl_unlock(); 1878 1879 return 0; 1880 1881 cleanup: 1882 macsec_rxsa_put(rx_sa); 1883 rtnl_unlock(); 1884 return err; 1885 } 1886 1887 static bool validate_add_rxsc(struct nlattr **attrs) 1888 { 1889 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1890 return false; 1891 1892 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1893 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1894 return false; 1895 } 1896 1897 return true; 1898 } 1899 1900 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1901 { 1902 struct net_device *dev; 1903 sci_t sci = MACSEC_UNDEF_SCI; 1904 struct nlattr **attrs = info->attrs; 1905 struct macsec_rx_sc *rx_sc; 1906 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1907 struct macsec_secy *secy; 1908 bool active = true; 1909 int ret; 1910 1911 if (!attrs[MACSEC_ATTR_IFINDEX]) 1912 return -EINVAL; 1913 1914 if (parse_rxsc_config(attrs, tb_rxsc)) 1915 return -EINVAL; 1916 1917 if (!validate_add_rxsc(tb_rxsc)) 1918 return -EINVAL; 1919 1920 rtnl_lock(); 1921 dev = get_dev_from_nl(genl_info_net(info), attrs); 1922 if (IS_ERR(dev)) { 1923 rtnl_unlock(); 1924 return PTR_ERR(dev); 1925 } 1926 1927 secy = &macsec_priv(dev)->secy; 1928 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1929 1930 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1931 active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1932 1933 rx_sc = create_rx_sc(dev, sci, active); 1934 if (IS_ERR(rx_sc)) { 1935 rtnl_unlock(); 1936 return PTR_ERR(rx_sc); 1937 } 1938 1939 if (macsec_is_offloaded(netdev_priv(dev))) { 1940 const struct macsec_ops *ops; 1941 struct macsec_context ctx; 1942 1943 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1944 if (!ops) { 1945 ret = -EOPNOTSUPP; 1946 goto cleanup; 1947 } 1948 1949 ctx.rx_sc = rx_sc; 1950 ctx.secy = secy; 1951 1952 ret = macsec_offload(ops->mdo_add_rxsc, &ctx); 1953 if (ret) 1954 goto cleanup; 1955 } 1956 1957 rtnl_unlock(); 1958 1959 return 0; 1960 1961 cleanup: 1962 del_rx_sc(secy, sci); 1963 free_rx_sc(rx_sc); 1964 rtnl_unlock(); 1965 return ret; 1966 } 1967 1968 static bool validate_add_txsa(struct nlattr **attrs) 1969 { 1970 if (!attrs[MACSEC_SA_ATTR_AN] || 1971 !attrs[MACSEC_SA_ATTR_PN] || 1972 !attrs[MACSEC_SA_ATTR_KEY] || 1973 !attrs[MACSEC_SA_ATTR_KEYID]) 1974 return false; 1975 1976 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1977 return false; 1978 1979 if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 1980 return false; 1981 1982 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1983 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1984 return false; 1985 } 1986 1987 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1988 return false; 1989 1990 return true; 1991 } 1992 1993 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1994 { 1995 struct net_device *dev; 1996 struct nlattr **attrs = info->attrs; 1997 struct macsec_secy *secy; 1998 struct macsec_tx_sc *tx_sc; 1999 struct macsec_tx_sa *tx_sa; 2000 unsigned char assoc_num; 2001 int pn_len; 2002 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2003 bool was_operational; 2004 int err; 2005 2006 if (!attrs[MACSEC_ATTR_IFINDEX]) 2007 return -EINVAL; 2008 2009 if (parse_sa_config(attrs, tb_sa)) 2010 return -EINVAL; 2011 2012 if (!validate_add_txsa(tb_sa)) 2013 return -EINVAL; 2014 2015 rtnl_lock(); 2016 dev = get_dev_from_nl(genl_info_net(info), attrs); 2017 if (IS_ERR(dev)) { 2018 rtnl_unlock(); 2019 return PTR_ERR(dev); 2020 } 2021 2022 secy = &macsec_priv(dev)->secy; 2023 tx_sc = &secy->tx_sc; 2024 2025 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 2026 2027 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 2028 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 2029 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 2030 rtnl_unlock(); 2031 return -EINVAL; 2032 } 2033 2034 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2035 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2036 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n", 2037 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2038 rtnl_unlock(); 2039 return -EINVAL; 2040 } 2041 2042 if (secy->xpn) { 2043 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 2044 rtnl_unlock(); 2045 return -EINVAL; 2046 } 2047 2048 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 2049 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n", 2050 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 2051 MACSEC_SALT_LEN); 2052 rtnl_unlock(); 2053 return -EINVAL; 2054 } 2055 } 2056 2057 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 2058 if (tx_sa) { 2059 rtnl_unlock(); 2060 return -EBUSY; 2061 } 2062 2063 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 2064 if (!tx_sa) { 2065 rtnl_unlock(); 2066 return -ENOMEM; 2067 } 2068 2069 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2070 secy->key_len, secy->icv_len); 2071 if (err < 0) { 2072 kfree(tx_sa); 2073 rtnl_unlock(); 2074 return err; 2075 } 2076 2077 spin_lock_bh(&tx_sa->lock); 2078 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2079 spin_unlock_bh(&tx_sa->lock); 2080 2081 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2082 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2083 2084 was_operational = secy->operational; 2085 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 2086 secy->operational = true; 2087 2088 if (secy->xpn) { 2089 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 2090 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 2091 MACSEC_SALT_LEN); 2092 } 2093 2094 /* If h/w offloading is available, propagate to the device */ 2095 if (macsec_is_offloaded(netdev_priv(dev))) { 2096 const struct macsec_ops *ops; 2097 struct macsec_context ctx; 2098 2099 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2100 if (!ops) { 2101 err = -EOPNOTSUPP; 2102 goto cleanup; 2103 } 2104 2105 ctx.sa.assoc_num = assoc_num; 2106 ctx.sa.tx_sa = tx_sa; 2107 ctx.secy = secy; 2108 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2109 secy->key_len); 2110 2111 err = macsec_offload(ops->mdo_add_txsa, &ctx); 2112 memzero_explicit(ctx.sa.key, secy->key_len); 2113 if (err) 2114 goto cleanup; 2115 } 2116 2117 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 2118 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 2119 2120 rtnl_unlock(); 2121 2122 return 0; 2123 2124 cleanup: 2125 secy->operational = was_operational; 2126 macsec_txsa_put(tx_sa); 2127 rtnl_unlock(); 2128 return err; 2129 } 2130 2131 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 2132 { 2133 struct nlattr **attrs = info->attrs; 2134 struct net_device *dev; 2135 struct macsec_secy *secy; 2136 struct macsec_rx_sc *rx_sc; 2137 struct macsec_rx_sa *rx_sa; 2138 u8 assoc_num; 2139 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2140 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2141 int ret; 2142 2143 if (!attrs[MACSEC_ATTR_IFINDEX]) 2144 return -EINVAL; 2145 2146 if (parse_sa_config(attrs, tb_sa)) 2147 return -EINVAL; 2148 2149 if (parse_rxsc_config(attrs, tb_rxsc)) 2150 return -EINVAL; 2151 2152 rtnl_lock(); 2153 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2154 &dev, &secy, &rx_sc, &assoc_num); 2155 if (IS_ERR(rx_sa)) { 2156 rtnl_unlock(); 2157 return PTR_ERR(rx_sa); 2158 } 2159 2160 if (rx_sa->active) { 2161 rtnl_unlock(); 2162 return -EBUSY; 2163 } 2164 2165 /* If h/w offloading is available, propagate to the device */ 2166 if (macsec_is_offloaded(netdev_priv(dev))) { 2167 const struct macsec_ops *ops; 2168 struct macsec_context ctx; 2169 2170 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2171 if (!ops) { 2172 ret = -EOPNOTSUPP; 2173 goto cleanup; 2174 } 2175 2176 ctx.sa.assoc_num = assoc_num; 2177 ctx.sa.rx_sa = rx_sa; 2178 ctx.secy = secy; 2179 2180 ret = macsec_offload(ops->mdo_del_rxsa, &ctx); 2181 if (ret) 2182 goto cleanup; 2183 } 2184 2185 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 2186 clear_rx_sa(rx_sa); 2187 2188 rtnl_unlock(); 2189 2190 return 0; 2191 2192 cleanup: 2193 rtnl_unlock(); 2194 return ret; 2195 } 2196 2197 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 2198 { 2199 struct nlattr **attrs = info->attrs; 2200 struct net_device *dev; 2201 struct macsec_secy *secy; 2202 struct macsec_rx_sc *rx_sc; 2203 sci_t sci; 2204 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2205 int ret; 2206 2207 if (!attrs[MACSEC_ATTR_IFINDEX]) 2208 return -EINVAL; 2209 2210 if (parse_rxsc_config(attrs, tb_rxsc)) 2211 return -EINVAL; 2212 2213 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 2214 return -EINVAL; 2215 2216 rtnl_lock(); 2217 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 2218 if (IS_ERR(dev)) { 2219 rtnl_unlock(); 2220 return PTR_ERR(dev); 2221 } 2222 2223 secy = &macsec_priv(dev)->secy; 2224 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 2225 2226 rx_sc = del_rx_sc(secy, sci); 2227 if (!rx_sc) { 2228 rtnl_unlock(); 2229 return -ENODEV; 2230 } 2231 2232 /* If h/w offloading is available, propagate to the device */ 2233 if (macsec_is_offloaded(netdev_priv(dev))) { 2234 const struct macsec_ops *ops; 2235 struct macsec_context ctx; 2236 2237 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2238 if (!ops) { 2239 ret = -EOPNOTSUPP; 2240 goto cleanup; 2241 } 2242 2243 ctx.rx_sc = rx_sc; 2244 ctx.secy = secy; 2245 ret = macsec_offload(ops->mdo_del_rxsc, &ctx); 2246 if (ret) 2247 goto cleanup; 2248 } 2249 2250 free_rx_sc(rx_sc); 2251 rtnl_unlock(); 2252 2253 return 0; 2254 2255 cleanup: 2256 rtnl_unlock(); 2257 return ret; 2258 } 2259 2260 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 2261 { 2262 struct nlattr **attrs = info->attrs; 2263 struct net_device *dev; 2264 struct macsec_secy *secy; 2265 struct macsec_tx_sc *tx_sc; 2266 struct macsec_tx_sa *tx_sa; 2267 u8 assoc_num; 2268 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2269 int ret; 2270 2271 if (!attrs[MACSEC_ATTR_IFINDEX]) 2272 return -EINVAL; 2273 2274 if (parse_sa_config(attrs, tb_sa)) 2275 return -EINVAL; 2276 2277 rtnl_lock(); 2278 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2279 &dev, &secy, &tx_sc, &assoc_num); 2280 if (IS_ERR(tx_sa)) { 2281 rtnl_unlock(); 2282 return PTR_ERR(tx_sa); 2283 } 2284 2285 if (tx_sa->active) { 2286 rtnl_unlock(); 2287 return -EBUSY; 2288 } 2289 2290 /* If h/w offloading is available, propagate to the device */ 2291 if (macsec_is_offloaded(netdev_priv(dev))) { 2292 const struct macsec_ops *ops; 2293 struct macsec_context ctx; 2294 2295 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2296 if (!ops) { 2297 ret = -EOPNOTSUPP; 2298 goto cleanup; 2299 } 2300 2301 ctx.sa.assoc_num = assoc_num; 2302 ctx.sa.tx_sa = tx_sa; 2303 ctx.secy = secy; 2304 2305 ret = macsec_offload(ops->mdo_del_txsa, &ctx); 2306 if (ret) 2307 goto cleanup; 2308 } 2309 2310 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 2311 clear_tx_sa(tx_sa); 2312 2313 rtnl_unlock(); 2314 2315 return 0; 2316 2317 cleanup: 2318 rtnl_unlock(); 2319 return ret; 2320 } 2321 2322 static bool validate_upd_sa(struct nlattr **attrs) 2323 { 2324 if (!attrs[MACSEC_SA_ATTR_AN] || 2325 attrs[MACSEC_SA_ATTR_KEY] || 2326 attrs[MACSEC_SA_ATTR_KEYID] || 2327 attrs[MACSEC_SA_ATTR_SSCI] || 2328 attrs[MACSEC_SA_ATTR_SALT]) 2329 return false; 2330 2331 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 2332 return false; 2333 2334 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 2335 return false; 2336 2337 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 2338 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 2339 return false; 2340 } 2341 2342 return true; 2343 } 2344 2345 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2346 { 2347 struct nlattr **attrs = info->attrs; 2348 struct net_device *dev; 2349 struct macsec_secy *secy; 2350 struct macsec_tx_sc *tx_sc; 2351 struct macsec_tx_sa *tx_sa; 2352 u8 assoc_num; 2353 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2354 bool was_operational, was_active; 2355 pn_t prev_pn; 2356 int ret = 0; 2357 2358 prev_pn.full64 = 0; 2359 2360 if (!attrs[MACSEC_ATTR_IFINDEX]) 2361 return -EINVAL; 2362 2363 if (parse_sa_config(attrs, tb_sa)) 2364 return -EINVAL; 2365 2366 if (!validate_upd_sa(tb_sa)) 2367 return -EINVAL; 2368 2369 rtnl_lock(); 2370 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2371 &dev, &secy, &tx_sc, &assoc_num); 2372 if (IS_ERR(tx_sa)) { 2373 rtnl_unlock(); 2374 return PTR_ERR(tx_sa); 2375 } 2376 2377 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2378 int pn_len; 2379 2380 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2381 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2382 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n", 2383 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2384 rtnl_unlock(); 2385 return -EINVAL; 2386 } 2387 2388 spin_lock_bh(&tx_sa->lock); 2389 prev_pn = tx_sa->next_pn_halves; 2390 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2391 spin_unlock_bh(&tx_sa->lock); 2392 } 2393 2394 was_active = tx_sa->active; 2395 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2396 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2397 2398 was_operational = secy->operational; 2399 if (assoc_num == tx_sc->encoding_sa) 2400 secy->operational = tx_sa->active; 2401 2402 /* If h/w offloading is available, propagate to the device */ 2403 if (macsec_is_offloaded(netdev_priv(dev))) { 2404 const struct macsec_ops *ops; 2405 struct macsec_context ctx; 2406 2407 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2408 if (!ops) { 2409 ret = -EOPNOTSUPP; 2410 goto cleanup; 2411 } 2412 2413 ctx.sa.assoc_num = assoc_num; 2414 ctx.sa.tx_sa = tx_sa; 2415 ctx.sa.update_pn = !!prev_pn.full64; 2416 ctx.secy = secy; 2417 2418 ret = macsec_offload(ops->mdo_upd_txsa, &ctx); 2419 if (ret) 2420 goto cleanup; 2421 } 2422 2423 rtnl_unlock(); 2424 2425 return 0; 2426 2427 cleanup: 2428 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2429 spin_lock_bh(&tx_sa->lock); 2430 tx_sa->next_pn_halves = prev_pn; 2431 spin_unlock_bh(&tx_sa->lock); 2432 } 2433 tx_sa->active = was_active; 2434 secy->operational = was_operational; 2435 rtnl_unlock(); 2436 return ret; 2437 } 2438 2439 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2440 { 2441 struct nlattr **attrs = info->attrs; 2442 struct net_device *dev; 2443 struct macsec_secy *secy; 2444 struct macsec_rx_sc *rx_sc; 2445 struct macsec_rx_sa *rx_sa; 2446 u8 assoc_num; 2447 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2448 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2449 bool was_active; 2450 pn_t prev_pn; 2451 int ret = 0; 2452 2453 prev_pn.full64 = 0; 2454 2455 if (!attrs[MACSEC_ATTR_IFINDEX]) 2456 return -EINVAL; 2457 2458 if (parse_rxsc_config(attrs, tb_rxsc)) 2459 return -EINVAL; 2460 2461 if (parse_sa_config(attrs, tb_sa)) 2462 return -EINVAL; 2463 2464 if (!validate_upd_sa(tb_sa)) 2465 return -EINVAL; 2466 2467 rtnl_lock(); 2468 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2469 &dev, &secy, &rx_sc, &assoc_num); 2470 if (IS_ERR(rx_sa)) { 2471 rtnl_unlock(); 2472 return PTR_ERR(rx_sa); 2473 } 2474 2475 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2476 int pn_len; 2477 2478 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2479 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2480 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n", 2481 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2482 rtnl_unlock(); 2483 return -EINVAL; 2484 } 2485 2486 spin_lock_bh(&rx_sa->lock); 2487 prev_pn = rx_sa->next_pn_halves; 2488 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2489 spin_unlock_bh(&rx_sa->lock); 2490 } 2491 2492 was_active = rx_sa->active; 2493 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2494 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2495 2496 /* If h/w offloading is available, propagate to the device */ 2497 if (macsec_is_offloaded(netdev_priv(dev))) { 2498 const struct macsec_ops *ops; 2499 struct macsec_context ctx; 2500 2501 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2502 if (!ops) { 2503 ret = -EOPNOTSUPP; 2504 goto cleanup; 2505 } 2506 2507 ctx.sa.assoc_num = assoc_num; 2508 ctx.sa.rx_sa = rx_sa; 2509 ctx.sa.update_pn = !!prev_pn.full64; 2510 ctx.secy = secy; 2511 2512 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx); 2513 if (ret) 2514 goto cleanup; 2515 } 2516 2517 rtnl_unlock(); 2518 return 0; 2519 2520 cleanup: 2521 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2522 spin_lock_bh(&rx_sa->lock); 2523 rx_sa->next_pn_halves = prev_pn; 2524 spin_unlock_bh(&rx_sa->lock); 2525 } 2526 rx_sa->active = was_active; 2527 rtnl_unlock(); 2528 return ret; 2529 } 2530 2531 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2532 { 2533 struct nlattr **attrs = info->attrs; 2534 struct net_device *dev; 2535 struct macsec_secy *secy; 2536 struct macsec_rx_sc *rx_sc; 2537 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2538 unsigned int prev_n_rx_sc; 2539 bool was_active; 2540 int ret; 2541 2542 if (!attrs[MACSEC_ATTR_IFINDEX]) 2543 return -EINVAL; 2544 2545 if (parse_rxsc_config(attrs, tb_rxsc)) 2546 return -EINVAL; 2547 2548 if (!validate_add_rxsc(tb_rxsc)) 2549 return -EINVAL; 2550 2551 rtnl_lock(); 2552 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2553 if (IS_ERR(rx_sc)) { 2554 rtnl_unlock(); 2555 return PTR_ERR(rx_sc); 2556 } 2557 2558 was_active = rx_sc->active; 2559 prev_n_rx_sc = secy->n_rx_sc; 2560 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2561 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2562 2563 if (rx_sc->active != new) 2564 secy->n_rx_sc += new ? 1 : -1; 2565 2566 rx_sc->active = new; 2567 } 2568 2569 /* If h/w offloading is available, propagate to the device */ 2570 if (macsec_is_offloaded(netdev_priv(dev))) { 2571 const struct macsec_ops *ops; 2572 struct macsec_context ctx; 2573 2574 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2575 if (!ops) { 2576 ret = -EOPNOTSUPP; 2577 goto cleanup; 2578 } 2579 2580 ctx.rx_sc = rx_sc; 2581 ctx.secy = secy; 2582 2583 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx); 2584 if (ret) 2585 goto cleanup; 2586 } 2587 2588 rtnl_unlock(); 2589 2590 return 0; 2591 2592 cleanup: 2593 secy->n_rx_sc = prev_n_rx_sc; 2594 rx_sc->active = was_active; 2595 rtnl_unlock(); 2596 return ret; 2597 } 2598 2599 static bool macsec_is_configured(struct macsec_dev *macsec) 2600 { 2601 struct macsec_secy *secy = &macsec->secy; 2602 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2603 int i; 2604 2605 if (secy->rx_sc) 2606 return true; 2607 2608 for (i = 0; i < MACSEC_NUM_AN; i++) 2609 if (tx_sc->sa[i]) 2610 return true; 2611 2612 return false; 2613 } 2614 2615 static bool macsec_needs_tx_tag(struct macsec_dev *macsec, 2616 const struct macsec_ops *ops) 2617 { 2618 return macsec->offload == MACSEC_OFFLOAD_PHY && 2619 ops->mdo_insert_tx_tag; 2620 } 2621 2622 static void macsec_set_head_tail_room(struct net_device *dev) 2623 { 2624 struct macsec_dev *macsec = macsec_priv(dev); 2625 struct net_device *real_dev = macsec->real_dev; 2626 int needed_headroom, needed_tailroom; 2627 const struct macsec_ops *ops; 2628 2629 ops = macsec_get_ops(macsec, NULL); 2630 if (ops) { 2631 needed_headroom = ops->needed_headroom; 2632 needed_tailroom = ops->needed_tailroom; 2633 } else { 2634 needed_headroom = MACSEC_NEEDED_HEADROOM; 2635 needed_tailroom = MACSEC_NEEDED_TAILROOM; 2636 } 2637 2638 dev->needed_headroom = real_dev->needed_headroom + needed_headroom; 2639 dev->needed_tailroom = real_dev->needed_tailroom + needed_tailroom; 2640 } 2641 2642 static int macsec_update_offload(struct net_device *dev, enum macsec_offload offload) 2643 { 2644 enum macsec_offload prev_offload; 2645 const struct macsec_ops *ops; 2646 struct macsec_context ctx; 2647 struct macsec_dev *macsec; 2648 int ret = 0; 2649 2650 macsec = macsec_priv(dev); 2651 2652 /* Check if the offloading mode is supported by the underlying layers */ 2653 if (offload != MACSEC_OFFLOAD_OFF && 2654 !macsec_check_offload(offload, macsec)) 2655 return -EOPNOTSUPP; 2656 2657 /* Check if the net device is busy. */ 2658 if (netif_running(dev)) 2659 return -EBUSY; 2660 2661 /* Check if the device already has rules configured: we do not support 2662 * rules migration. 2663 */ 2664 if (macsec_is_configured(macsec)) 2665 return -EBUSY; 2666 2667 prev_offload = macsec->offload; 2668 2669 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload, 2670 macsec, &ctx); 2671 if (!ops) 2672 return -EOPNOTSUPP; 2673 2674 macsec->offload = offload; 2675 2676 ctx.secy = &macsec->secy; 2677 ret = offload == MACSEC_OFFLOAD_OFF ? macsec_offload(ops->mdo_del_secy, &ctx) 2678 : macsec_offload(ops->mdo_add_secy, &ctx); 2679 if (ret) { 2680 macsec->offload = prev_offload; 2681 return ret; 2682 } 2683 2684 macsec_set_head_tail_room(dev); 2685 macsec->insert_tx_tag = macsec_needs_tx_tag(macsec, ops); 2686 2687 return ret; 2688 } 2689 2690 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info) 2691 { 2692 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1]; 2693 struct nlattr **attrs = info->attrs; 2694 enum macsec_offload offload; 2695 struct macsec_dev *macsec; 2696 struct net_device *dev; 2697 int ret = 0; 2698 2699 if (!attrs[MACSEC_ATTR_IFINDEX]) 2700 return -EINVAL; 2701 2702 if (!attrs[MACSEC_ATTR_OFFLOAD]) 2703 return -EINVAL; 2704 2705 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX, 2706 attrs[MACSEC_ATTR_OFFLOAD], 2707 macsec_genl_offload_policy, NULL)) 2708 return -EINVAL; 2709 2710 rtnl_lock(); 2711 2712 dev = get_dev_from_nl(genl_info_net(info), attrs); 2713 if (IS_ERR(dev)) { 2714 ret = PTR_ERR(dev); 2715 goto out; 2716 } 2717 macsec = macsec_priv(dev); 2718 2719 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) { 2720 ret = -EINVAL; 2721 goto out; 2722 } 2723 2724 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]); 2725 2726 if (macsec->offload != offload) 2727 ret = macsec_update_offload(dev, offload); 2728 out: 2729 rtnl_unlock(); 2730 return ret; 2731 } 2732 2733 static void get_tx_sa_stats(struct net_device *dev, int an, 2734 struct macsec_tx_sa *tx_sa, 2735 struct macsec_tx_sa_stats *sum) 2736 { 2737 struct macsec_dev *macsec = macsec_priv(dev); 2738 int cpu; 2739 2740 /* If h/w offloading is available, propagate to the device */ 2741 if (macsec_is_offloaded(macsec)) { 2742 const struct macsec_ops *ops; 2743 struct macsec_context ctx; 2744 2745 ops = macsec_get_ops(macsec, &ctx); 2746 if (ops) { 2747 ctx.sa.assoc_num = an; 2748 ctx.sa.tx_sa = tx_sa; 2749 ctx.stats.tx_sa_stats = sum; 2750 ctx.secy = &macsec_priv(dev)->secy; 2751 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx); 2752 } 2753 return; 2754 } 2755 2756 for_each_possible_cpu(cpu) { 2757 const struct macsec_tx_sa_stats *stats = 2758 per_cpu_ptr(tx_sa->stats, cpu); 2759 2760 sum->OutPktsProtected += stats->OutPktsProtected; 2761 sum->OutPktsEncrypted += stats->OutPktsEncrypted; 2762 } 2763 } 2764 2765 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum) 2766 { 2767 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, 2768 sum->OutPktsProtected) || 2769 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2770 sum->OutPktsEncrypted)) 2771 return -EMSGSIZE; 2772 2773 return 0; 2774 } 2775 2776 static void get_rx_sa_stats(struct net_device *dev, 2777 struct macsec_rx_sc *rx_sc, int an, 2778 struct macsec_rx_sa *rx_sa, 2779 struct macsec_rx_sa_stats *sum) 2780 { 2781 struct macsec_dev *macsec = macsec_priv(dev); 2782 int cpu; 2783 2784 /* If h/w offloading is available, propagate to the device */ 2785 if (macsec_is_offloaded(macsec)) { 2786 const struct macsec_ops *ops; 2787 struct macsec_context ctx; 2788 2789 ops = macsec_get_ops(macsec, &ctx); 2790 if (ops) { 2791 ctx.sa.assoc_num = an; 2792 ctx.sa.rx_sa = rx_sa; 2793 ctx.stats.rx_sa_stats = sum; 2794 ctx.secy = &macsec_priv(dev)->secy; 2795 ctx.rx_sc = rx_sc; 2796 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx); 2797 } 2798 return; 2799 } 2800 2801 for_each_possible_cpu(cpu) { 2802 const struct macsec_rx_sa_stats *stats = 2803 per_cpu_ptr(rx_sa->stats, cpu); 2804 2805 sum->InPktsOK += stats->InPktsOK; 2806 sum->InPktsInvalid += stats->InPktsInvalid; 2807 sum->InPktsNotValid += stats->InPktsNotValid; 2808 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA; 2809 sum->InPktsUnusedSA += stats->InPktsUnusedSA; 2810 } 2811 } 2812 2813 static int copy_rx_sa_stats(struct sk_buff *skb, 2814 struct macsec_rx_sa_stats *sum) 2815 { 2816 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) || 2817 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, 2818 sum->InPktsInvalid) || 2819 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, 2820 sum->InPktsNotValid) || 2821 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2822 sum->InPktsNotUsingSA) || 2823 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, 2824 sum->InPktsUnusedSA)) 2825 return -EMSGSIZE; 2826 2827 return 0; 2828 } 2829 2830 static void get_rx_sc_stats(struct net_device *dev, 2831 struct macsec_rx_sc *rx_sc, 2832 struct macsec_rx_sc_stats *sum) 2833 { 2834 struct macsec_dev *macsec = macsec_priv(dev); 2835 int cpu; 2836 2837 /* If h/w offloading is available, propagate to the device */ 2838 if (macsec_is_offloaded(macsec)) { 2839 const struct macsec_ops *ops; 2840 struct macsec_context ctx; 2841 2842 ops = macsec_get_ops(macsec, &ctx); 2843 if (ops) { 2844 ctx.stats.rx_sc_stats = sum; 2845 ctx.secy = &macsec_priv(dev)->secy; 2846 ctx.rx_sc = rx_sc; 2847 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx); 2848 } 2849 return; 2850 } 2851 2852 for_each_possible_cpu(cpu) { 2853 const struct pcpu_rx_sc_stats *stats; 2854 struct macsec_rx_sc_stats tmp; 2855 unsigned int start; 2856 2857 stats = per_cpu_ptr(rx_sc->stats, cpu); 2858 do { 2859 start = u64_stats_fetch_begin(&stats->syncp); 2860 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2861 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2862 2863 sum->InOctetsValidated += tmp.InOctetsValidated; 2864 sum->InOctetsDecrypted += tmp.InOctetsDecrypted; 2865 sum->InPktsUnchecked += tmp.InPktsUnchecked; 2866 sum->InPktsDelayed += tmp.InPktsDelayed; 2867 sum->InPktsOK += tmp.InPktsOK; 2868 sum->InPktsInvalid += tmp.InPktsInvalid; 2869 sum->InPktsLate += tmp.InPktsLate; 2870 sum->InPktsNotValid += tmp.InPktsNotValid; 2871 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2872 sum->InPktsUnusedSA += tmp.InPktsUnusedSA; 2873 } 2874 } 2875 2876 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum) 2877 { 2878 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2879 sum->InOctetsValidated, 2880 MACSEC_RXSC_STATS_ATTR_PAD) || 2881 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2882 sum->InOctetsDecrypted, 2883 MACSEC_RXSC_STATS_ATTR_PAD) || 2884 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2885 sum->InPktsUnchecked, 2886 MACSEC_RXSC_STATS_ATTR_PAD) || 2887 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2888 sum->InPktsDelayed, 2889 MACSEC_RXSC_STATS_ATTR_PAD) || 2890 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2891 sum->InPktsOK, 2892 MACSEC_RXSC_STATS_ATTR_PAD) || 2893 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2894 sum->InPktsInvalid, 2895 MACSEC_RXSC_STATS_ATTR_PAD) || 2896 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2897 sum->InPktsLate, 2898 MACSEC_RXSC_STATS_ATTR_PAD) || 2899 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2900 sum->InPktsNotValid, 2901 MACSEC_RXSC_STATS_ATTR_PAD) || 2902 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2903 sum->InPktsNotUsingSA, 2904 MACSEC_RXSC_STATS_ATTR_PAD) || 2905 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2906 sum->InPktsUnusedSA, 2907 MACSEC_RXSC_STATS_ATTR_PAD)) 2908 return -EMSGSIZE; 2909 2910 return 0; 2911 } 2912 2913 static void get_tx_sc_stats(struct net_device *dev, 2914 struct macsec_tx_sc_stats *sum) 2915 { 2916 struct macsec_dev *macsec = macsec_priv(dev); 2917 int cpu; 2918 2919 /* If h/w offloading is available, propagate to the device */ 2920 if (macsec_is_offloaded(macsec)) { 2921 const struct macsec_ops *ops; 2922 struct macsec_context ctx; 2923 2924 ops = macsec_get_ops(macsec, &ctx); 2925 if (ops) { 2926 ctx.stats.tx_sc_stats = sum; 2927 ctx.secy = &macsec_priv(dev)->secy; 2928 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx); 2929 } 2930 return; 2931 } 2932 2933 for_each_possible_cpu(cpu) { 2934 const struct pcpu_tx_sc_stats *stats; 2935 struct macsec_tx_sc_stats tmp; 2936 unsigned int start; 2937 2938 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu); 2939 do { 2940 start = u64_stats_fetch_begin(&stats->syncp); 2941 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2942 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2943 2944 sum->OutPktsProtected += tmp.OutPktsProtected; 2945 sum->OutPktsEncrypted += tmp.OutPktsEncrypted; 2946 sum->OutOctetsProtected += tmp.OutOctetsProtected; 2947 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2948 } 2949 } 2950 2951 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum) 2952 { 2953 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2954 sum->OutPktsProtected, 2955 MACSEC_TXSC_STATS_ATTR_PAD) || 2956 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2957 sum->OutPktsEncrypted, 2958 MACSEC_TXSC_STATS_ATTR_PAD) || 2959 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2960 sum->OutOctetsProtected, 2961 MACSEC_TXSC_STATS_ATTR_PAD) || 2962 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2963 sum->OutOctetsEncrypted, 2964 MACSEC_TXSC_STATS_ATTR_PAD)) 2965 return -EMSGSIZE; 2966 2967 return 0; 2968 } 2969 2970 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum) 2971 { 2972 struct macsec_dev *macsec = macsec_priv(dev); 2973 int cpu; 2974 2975 /* If h/w offloading is available, propagate to the device */ 2976 if (macsec_is_offloaded(macsec)) { 2977 const struct macsec_ops *ops; 2978 struct macsec_context ctx; 2979 2980 ops = macsec_get_ops(macsec, &ctx); 2981 if (ops) { 2982 ctx.stats.dev_stats = sum; 2983 ctx.secy = &macsec_priv(dev)->secy; 2984 macsec_offload(ops->mdo_get_dev_stats, &ctx); 2985 } 2986 return; 2987 } 2988 2989 for_each_possible_cpu(cpu) { 2990 const struct pcpu_secy_stats *stats; 2991 struct macsec_dev_stats tmp; 2992 unsigned int start; 2993 2994 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu); 2995 do { 2996 start = u64_stats_fetch_begin(&stats->syncp); 2997 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2998 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2999 3000 sum->OutPktsUntagged += tmp.OutPktsUntagged; 3001 sum->InPktsUntagged += tmp.InPktsUntagged; 3002 sum->OutPktsTooLong += tmp.OutPktsTooLong; 3003 sum->InPktsNoTag += tmp.InPktsNoTag; 3004 sum->InPktsBadTag += tmp.InPktsBadTag; 3005 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI; 3006 sum->InPktsNoSCI += tmp.InPktsNoSCI; 3007 sum->InPktsOverrun += tmp.InPktsOverrun; 3008 } 3009 } 3010 3011 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum) 3012 { 3013 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 3014 sum->OutPktsUntagged, 3015 MACSEC_SECY_STATS_ATTR_PAD) || 3016 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 3017 sum->InPktsUntagged, 3018 MACSEC_SECY_STATS_ATTR_PAD) || 3019 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 3020 sum->OutPktsTooLong, 3021 MACSEC_SECY_STATS_ATTR_PAD) || 3022 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 3023 sum->InPktsNoTag, 3024 MACSEC_SECY_STATS_ATTR_PAD) || 3025 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 3026 sum->InPktsBadTag, 3027 MACSEC_SECY_STATS_ATTR_PAD) || 3028 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 3029 sum->InPktsUnknownSCI, 3030 MACSEC_SECY_STATS_ATTR_PAD) || 3031 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 3032 sum->InPktsNoSCI, 3033 MACSEC_SECY_STATS_ATTR_PAD) || 3034 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 3035 sum->InPktsOverrun, 3036 MACSEC_SECY_STATS_ATTR_PAD)) 3037 return -EMSGSIZE; 3038 3039 return 0; 3040 } 3041 3042 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 3043 { 3044 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3045 struct nlattr *secy_nest = nla_nest_start_noflag(skb, 3046 MACSEC_ATTR_SECY); 3047 u64 csid; 3048 3049 if (!secy_nest) 3050 return 1; 3051 3052 switch (secy->key_len) { 3053 case MACSEC_GCM_AES_128_SAK_LEN: 3054 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 3055 break; 3056 case MACSEC_GCM_AES_256_SAK_LEN: 3057 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 3058 break; 3059 default: 3060 goto cancel; 3061 } 3062 3063 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 3064 MACSEC_SECY_ATTR_PAD) || 3065 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 3066 csid, MACSEC_SECY_ATTR_PAD) || 3067 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 3068 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 3069 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 3070 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 3071 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 3072 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 3073 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 3074 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 3075 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 3076 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 3077 goto cancel; 3078 3079 if (secy->replay_protect) { 3080 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 3081 goto cancel; 3082 } 3083 3084 nla_nest_end(skb, secy_nest); 3085 return 0; 3086 3087 cancel: 3088 nla_nest_cancel(skb, secy_nest); 3089 return 1; 3090 } 3091 3092 static noinline_for_stack int 3093 dump_secy(struct macsec_secy *secy, struct net_device *dev, 3094 struct sk_buff *skb, struct netlink_callback *cb) 3095 { 3096 struct macsec_tx_sc_stats tx_sc_stats = {0, }; 3097 struct macsec_tx_sa_stats tx_sa_stats = {0, }; 3098 struct macsec_rx_sc_stats rx_sc_stats = {0, }; 3099 struct macsec_rx_sa_stats rx_sa_stats = {0, }; 3100 struct macsec_dev *macsec = netdev_priv(dev); 3101 struct macsec_dev_stats dev_stats = {0, }; 3102 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3103 struct nlattr *txsa_list, *rxsc_list; 3104 struct macsec_rx_sc *rx_sc; 3105 struct nlattr *attr; 3106 void *hdr; 3107 int i, j; 3108 3109 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3110 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 3111 if (!hdr) 3112 return -EMSGSIZE; 3113 3114 genl_dump_check_consistent(cb, hdr); 3115 3116 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 3117 goto nla_put_failure; 3118 3119 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD); 3120 if (!attr) 3121 goto nla_put_failure; 3122 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload)) 3123 goto nla_put_failure; 3124 nla_nest_end(skb, attr); 3125 3126 if (nla_put_secy(secy, skb)) 3127 goto nla_put_failure; 3128 3129 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS); 3130 if (!attr) 3131 goto nla_put_failure; 3132 3133 get_tx_sc_stats(dev, &tx_sc_stats); 3134 if (copy_tx_sc_stats(skb, &tx_sc_stats)) { 3135 nla_nest_cancel(skb, attr); 3136 goto nla_put_failure; 3137 } 3138 nla_nest_end(skb, attr); 3139 3140 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS); 3141 if (!attr) 3142 goto nla_put_failure; 3143 get_secy_stats(dev, &dev_stats); 3144 if (copy_secy_stats(skb, &dev_stats)) { 3145 nla_nest_cancel(skb, attr); 3146 goto nla_put_failure; 3147 } 3148 nla_nest_end(skb, attr); 3149 3150 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST); 3151 if (!txsa_list) 3152 goto nla_put_failure; 3153 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 3154 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 3155 struct nlattr *txsa_nest; 3156 u64 pn; 3157 int pn_len; 3158 3159 if (!tx_sa) 3160 continue; 3161 3162 txsa_nest = nla_nest_start_noflag(skb, j++); 3163 if (!txsa_nest) { 3164 nla_nest_cancel(skb, txsa_list); 3165 goto nla_put_failure; 3166 } 3167 3168 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS); 3169 if (!attr) { 3170 nla_nest_cancel(skb, txsa_nest); 3171 nla_nest_cancel(skb, txsa_list); 3172 goto nla_put_failure; 3173 } 3174 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats)); 3175 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats); 3176 if (copy_tx_sa_stats(skb, &tx_sa_stats)) { 3177 nla_nest_cancel(skb, attr); 3178 nla_nest_cancel(skb, txsa_nest); 3179 nla_nest_cancel(skb, txsa_list); 3180 goto nla_put_failure; 3181 } 3182 nla_nest_end(skb, attr); 3183 3184 if (secy->xpn) { 3185 pn = tx_sa->next_pn; 3186 pn_len = MACSEC_XPN_PN_LEN; 3187 } else { 3188 pn = tx_sa->next_pn_halves.lower; 3189 pn_len = MACSEC_DEFAULT_PN_LEN; 3190 } 3191 3192 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3193 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3194 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 3195 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) || 3196 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 3197 nla_nest_cancel(skb, txsa_nest); 3198 nla_nest_cancel(skb, txsa_list); 3199 goto nla_put_failure; 3200 } 3201 3202 nla_nest_end(skb, txsa_nest); 3203 } 3204 nla_nest_end(skb, txsa_list); 3205 3206 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST); 3207 if (!rxsc_list) 3208 goto nla_put_failure; 3209 3210 j = 1; 3211 for_each_rxsc_rtnl(secy, rx_sc) { 3212 int k; 3213 struct nlattr *rxsa_list; 3214 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++); 3215 3216 if (!rxsc_nest) { 3217 nla_nest_cancel(skb, rxsc_list); 3218 goto nla_put_failure; 3219 } 3220 3221 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 3222 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 3223 MACSEC_RXSC_ATTR_PAD)) { 3224 nla_nest_cancel(skb, rxsc_nest); 3225 nla_nest_cancel(skb, rxsc_list); 3226 goto nla_put_failure; 3227 } 3228 3229 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS); 3230 if (!attr) { 3231 nla_nest_cancel(skb, rxsc_nest); 3232 nla_nest_cancel(skb, rxsc_list); 3233 goto nla_put_failure; 3234 } 3235 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats)); 3236 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats); 3237 if (copy_rx_sc_stats(skb, &rx_sc_stats)) { 3238 nla_nest_cancel(skb, attr); 3239 nla_nest_cancel(skb, rxsc_nest); 3240 nla_nest_cancel(skb, rxsc_list); 3241 goto nla_put_failure; 3242 } 3243 nla_nest_end(skb, attr); 3244 3245 rxsa_list = nla_nest_start_noflag(skb, 3246 MACSEC_RXSC_ATTR_SA_LIST); 3247 if (!rxsa_list) { 3248 nla_nest_cancel(skb, rxsc_nest); 3249 nla_nest_cancel(skb, rxsc_list); 3250 goto nla_put_failure; 3251 } 3252 3253 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 3254 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 3255 struct nlattr *rxsa_nest; 3256 u64 pn; 3257 int pn_len; 3258 3259 if (!rx_sa) 3260 continue; 3261 3262 rxsa_nest = nla_nest_start_noflag(skb, k++); 3263 if (!rxsa_nest) { 3264 nla_nest_cancel(skb, rxsa_list); 3265 nla_nest_cancel(skb, rxsc_nest); 3266 nla_nest_cancel(skb, rxsc_list); 3267 goto nla_put_failure; 3268 } 3269 3270 attr = nla_nest_start_noflag(skb, 3271 MACSEC_SA_ATTR_STATS); 3272 if (!attr) { 3273 nla_nest_cancel(skb, rxsa_list); 3274 nla_nest_cancel(skb, rxsc_nest); 3275 nla_nest_cancel(skb, rxsc_list); 3276 goto nla_put_failure; 3277 } 3278 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats)); 3279 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats); 3280 if (copy_rx_sa_stats(skb, &rx_sa_stats)) { 3281 nla_nest_cancel(skb, attr); 3282 nla_nest_cancel(skb, rxsa_list); 3283 nla_nest_cancel(skb, rxsc_nest); 3284 nla_nest_cancel(skb, rxsc_list); 3285 goto nla_put_failure; 3286 } 3287 nla_nest_end(skb, attr); 3288 3289 if (secy->xpn) { 3290 pn = rx_sa->next_pn; 3291 pn_len = MACSEC_XPN_PN_LEN; 3292 } else { 3293 pn = rx_sa->next_pn_halves.lower; 3294 pn_len = MACSEC_DEFAULT_PN_LEN; 3295 } 3296 3297 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3298 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3299 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 3300 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) || 3301 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 3302 nla_nest_cancel(skb, rxsa_nest); 3303 nla_nest_cancel(skb, rxsc_nest); 3304 nla_nest_cancel(skb, rxsc_list); 3305 goto nla_put_failure; 3306 } 3307 nla_nest_end(skb, rxsa_nest); 3308 } 3309 3310 nla_nest_end(skb, rxsa_list); 3311 nla_nest_end(skb, rxsc_nest); 3312 } 3313 3314 nla_nest_end(skb, rxsc_list); 3315 3316 genlmsg_end(skb, hdr); 3317 3318 return 0; 3319 3320 nla_put_failure: 3321 genlmsg_cancel(skb, hdr); 3322 return -EMSGSIZE; 3323 } 3324 3325 static int macsec_generation = 1; /* protected by RTNL */ 3326 3327 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 3328 { 3329 struct net *net = sock_net(skb->sk); 3330 struct net_device *dev; 3331 int dev_idx, d; 3332 3333 dev_idx = cb->args[0]; 3334 3335 d = 0; 3336 rtnl_lock(); 3337 3338 cb->seq = macsec_generation; 3339 3340 for_each_netdev(net, dev) { 3341 struct macsec_secy *secy; 3342 3343 if (d < dev_idx) 3344 goto next; 3345 3346 if (!netif_is_macsec(dev)) 3347 goto next; 3348 3349 secy = &macsec_priv(dev)->secy; 3350 if (dump_secy(secy, dev, skb, cb) < 0) 3351 goto done; 3352 next: 3353 d++; 3354 } 3355 3356 done: 3357 rtnl_unlock(); 3358 cb->args[0] = d; 3359 return skb->len; 3360 } 3361 3362 static const struct genl_small_ops macsec_genl_ops[] = { 3363 { 3364 .cmd = MACSEC_CMD_GET_TXSC, 3365 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3366 .dumpit = macsec_dump_txsc, 3367 }, 3368 { 3369 .cmd = MACSEC_CMD_ADD_RXSC, 3370 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3371 .doit = macsec_add_rxsc, 3372 .flags = GENL_ADMIN_PERM, 3373 }, 3374 { 3375 .cmd = MACSEC_CMD_DEL_RXSC, 3376 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3377 .doit = macsec_del_rxsc, 3378 .flags = GENL_ADMIN_PERM, 3379 }, 3380 { 3381 .cmd = MACSEC_CMD_UPD_RXSC, 3382 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3383 .doit = macsec_upd_rxsc, 3384 .flags = GENL_ADMIN_PERM, 3385 }, 3386 { 3387 .cmd = MACSEC_CMD_ADD_TXSA, 3388 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3389 .doit = macsec_add_txsa, 3390 .flags = GENL_ADMIN_PERM, 3391 }, 3392 { 3393 .cmd = MACSEC_CMD_DEL_TXSA, 3394 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3395 .doit = macsec_del_txsa, 3396 .flags = GENL_ADMIN_PERM, 3397 }, 3398 { 3399 .cmd = MACSEC_CMD_UPD_TXSA, 3400 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3401 .doit = macsec_upd_txsa, 3402 .flags = GENL_ADMIN_PERM, 3403 }, 3404 { 3405 .cmd = MACSEC_CMD_ADD_RXSA, 3406 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3407 .doit = macsec_add_rxsa, 3408 .flags = GENL_ADMIN_PERM, 3409 }, 3410 { 3411 .cmd = MACSEC_CMD_DEL_RXSA, 3412 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3413 .doit = macsec_del_rxsa, 3414 .flags = GENL_ADMIN_PERM, 3415 }, 3416 { 3417 .cmd = MACSEC_CMD_UPD_RXSA, 3418 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3419 .doit = macsec_upd_rxsa, 3420 .flags = GENL_ADMIN_PERM, 3421 }, 3422 { 3423 .cmd = MACSEC_CMD_UPD_OFFLOAD, 3424 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3425 .doit = macsec_upd_offload, 3426 .flags = GENL_ADMIN_PERM, 3427 }, 3428 }; 3429 3430 static struct genl_family macsec_fam __ro_after_init = { 3431 .name = MACSEC_GENL_NAME, 3432 .hdrsize = 0, 3433 .version = MACSEC_GENL_VERSION, 3434 .maxattr = MACSEC_ATTR_MAX, 3435 .policy = macsec_genl_policy, 3436 .netnsok = true, 3437 .module = THIS_MODULE, 3438 .small_ops = macsec_genl_ops, 3439 .n_small_ops = ARRAY_SIZE(macsec_genl_ops), 3440 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1, 3441 }; 3442 3443 static struct sk_buff *macsec_insert_tx_tag(struct sk_buff *skb, 3444 struct net_device *dev) 3445 { 3446 struct macsec_dev *macsec = macsec_priv(dev); 3447 const struct macsec_ops *ops; 3448 struct phy_device *phydev; 3449 struct macsec_context ctx; 3450 int skb_final_len; 3451 int err; 3452 3453 ops = macsec_get_ops(macsec, &ctx); 3454 skb_final_len = skb->len - ETH_HLEN + ops->needed_headroom + 3455 ops->needed_tailroom; 3456 if (unlikely(skb_final_len > macsec->real_dev->mtu)) { 3457 err = -EINVAL; 3458 goto cleanup; 3459 } 3460 3461 phydev = macsec->real_dev->phydev; 3462 3463 err = skb_ensure_writable_head_tail(skb, dev); 3464 if (unlikely(err < 0)) 3465 goto cleanup; 3466 3467 err = ops->mdo_insert_tx_tag(phydev, skb); 3468 if (unlikely(err)) 3469 goto cleanup; 3470 3471 return skb; 3472 cleanup: 3473 kfree_skb(skb); 3474 return ERR_PTR(err); 3475 } 3476 3477 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 3478 struct net_device *dev) 3479 { 3480 struct macsec_dev *macsec = netdev_priv(dev); 3481 struct macsec_secy *secy = &macsec->secy; 3482 struct pcpu_secy_stats *secy_stats; 3483 int ret, len; 3484 3485 if (macsec_is_offloaded(netdev_priv(dev))) { 3486 struct metadata_dst *md_dst = secy->tx_sc.md_dst; 3487 3488 skb_dst_drop(skb); 3489 dst_hold(&md_dst->dst); 3490 skb_dst_set(skb, &md_dst->dst); 3491 3492 if (macsec->insert_tx_tag) { 3493 skb = macsec_insert_tx_tag(skb, dev); 3494 if (IS_ERR(skb)) { 3495 DEV_STATS_INC(dev, tx_dropped); 3496 return NETDEV_TX_OK; 3497 } 3498 } 3499 3500 skb->dev = macsec->real_dev; 3501 return dev_queue_xmit(skb); 3502 } 3503 3504 /* 10.5 */ 3505 if (!secy->protect_frames) { 3506 secy_stats = this_cpu_ptr(macsec->stats); 3507 u64_stats_update_begin(&secy_stats->syncp); 3508 secy_stats->stats.OutPktsUntagged++; 3509 u64_stats_update_end(&secy_stats->syncp); 3510 skb->dev = macsec->real_dev; 3511 len = skb->len; 3512 ret = dev_queue_xmit(skb); 3513 count_tx(dev, ret, len); 3514 return ret; 3515 } 3516 3517 if (!secy->operational) { 3518 kfree_skb(skb); 3519 DEV_STATS_INC(dev, tx_dropped); 3520 return NETDEV_TX_OK; 3521 } 3522 3523 len = skb->len; 3524 skb = macsec_encrypt(skb, dev); 3525 if (IS_ERR(skb)) { 3526 if (PTR_ERR(skb) != -EINPROGRESS) 3527 DEV_STATS_INC(dev, tx_dropped); 3528 return NETDEV_TX_OK; 3529 } 3530 3531 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 3532 3533 macsec_encrypt_finish(skb, dev); 3534 ret = dev_queue_xmit(skb); 3535 count_tx(dev, ret, len); 3536 return ret; 3537 } 3538 3539 #define MACSEC_FEATURES \ 3540 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 3541 3542 static int macsec_dev_init(struct net_device *dev) 3543 { 3544 struct macsec_dev *macsec = macsec_priv(dev); 3545 struct net_device *real_dev = macsec->real_dev; 3546 int err; 3547 3548 err = gro_cells_init(&macsec->gro_cells, dev); 3549 if (err) 3550 return err; 3551 3552 dev->features = real_dev->features & MACSEC_FEATURES; 3553 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 3554 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 3555 3556 macsec_set_head_tail_room(dev); 3557 3558 if (is_zero_ether_addr(dev->dev_addr)) 3559 eth_hw_addr_inherit(dev, real_dev); 3560 if (is_zero_ether_addr(dev->broadcast)) 3561 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 3562 3563 /* Get macsec's reference to real_dev */ 3564 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL); 3565 3566 return 0; 3567 } 3568 3569 static void macsec_dev_uninit(struct net_device *dev) 3570 { 3571 struct macsec_dev *macsec = macsec_priv(dev); 3572 3573 gro_cells_destroy(&macsec->gro_cells); 3574 } 3575 3576 static netdev_features_t macsec_fix_features(struct net_device *dev, 3577 netdev_features_t features) 3578 { 3579 struct macsec_dev *macsec = macsec_priv(dev); 3580 struct net_device *real_dev = macsec->real_dev; 3581 3582 features &= (real_dev->features & MACSEC_FEATURES) | 3583 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 3584 features |= NETIF_F_LLTX; 3585 3586 return features; 3587 } 3588 3589 static int macsec_dev_open(struct net_device *dev) 3590 { 3591 struct macsec_dev *macsec = macsec_priv(dev); 3592 struct net_device *real_dev = macsec->real_dev; 3593 int err; 3594 3595 err = dev_uc_add(real_dev, dev->dev_addr); 3596 if (err < 0) 3597 return err; 3598 3599 if (dev->flags & IFF_ALLMULTI) { 3600 err = dev_set_allmulti(real_dev, 1); 3601 if (err < 0) 3602 goto del_unicast; 3603 } 3604 3605 if (dev->flags & IFF_PROMISC) { 3606 err = dev_set_promiscuity(real_dev, 1); 3607 if (err < 0) 3608 goto clear_allmulti; 3609 } 3610 3611 /* If h/w offloading is available, propagate to the device */ 3612 if (macsec_is_offloaded(macsec)) { 3613 const struct macsec_ops *ops; 3614 struct macsec_context ctx; 3615 3616 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3617 if (!ops) { 3618 err = -EOPNOTSUPP; 3619 goto clear_allmulti; 3620 } 3621 3622 ctx.secy = &macsec->secy; 3623 err = macsec_offload(ops->mdo_dev_open, &ctx); 3624 if (err) 3625 goto clear_allmulti; 3626 } 3627 3628 if (netif_carrier_ok(real_dev)) 3629 netif_carrier_on(dev); 3630 3631 return 0; 3632 clear_allmulti: 3633 if (dev->flags & IFF_ALLMULTI) 3634 dev_set_allmulti(real_dev, -1); 3635 del_unicast: 3636 dev_uc_del(real_dev, dev->dev_addr); 3637 netif_carrier_off(dev); 3638 return err; 3639 } 3640 3641 static int macsec_dev_stop(struct net_device *dev) 3642 { 3643 struct macsec_dev *macsec = macsec_priv(dev); 3644 struct net_device *real_dev = macsec->real_dev; 3645 3646 netif_carrier_off(dev); 3647 3648 /* If h/w offloading is available, propagate to the device */ 3649 if (macsec_is_offloaded(macsec)) { 3650 const struct macsec_ops *ops; 3651 struct macsec_context ctx; 3652 3653 ops = macsec_get_ops(macsec, &ctx); 3654 if (ops) { 3655 ctx.secy = &macsec->secy; 3656 macsec_offload(ops->mdo_dev_stop, &ctx); 3657 } 3658 } 3659 3660 dev_mc_unsync(real_dev, dev); 3661 dev_uc_unsync(real_dev, dev); 3662 3663 if (dev->flags & IFF_ALLMULTI) 3664 dev_set_allmulti(real_dev, -1); 3665 3666 if (dev->flags & IFF_PROMISC) 3667 dev_set_promiscuity(real_dev, -1); 3668 3669 dev_uc_del(real_dev, dev->dev_addr); 3670 3671 return 0; 3672 } 3673 3674 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 3675 { 3676 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3677 3678 if (!(dev->flags & IFF_UP)) 3679 return; 3680 3681 if (change & IFF_ALLMULTI) 3682 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 3683 3684 if (change & IFF_PROMISC) 3685 dev_set_promiscuity(real_dev, 3686 dev->flags & IFF_PROMISC ? 1 : -1); 3687 } 3688 3689 static void macsec_dev_set_rx_mode(struct net_device *dev) 3690 { 3691 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3692 3693 dev_mc_sync(real_dev, dev); 3694 dev_uc_sync(real_dev, dev); 3695 } 3696 3697 static int macsec_set_mac_address(struct net_device *dev, void *p) 3698 { 3699 struct macsec_dev *macsec = macsec_priv(dev); 3700 struct net_device *real_dev = macsec->real_dev; 3701 struct sockaddr *addr = p; 3702 u8 old_addr[ETH_ALEN]; 3703 int err; 3704 3705 if (!is_valid_ether_addr(addr->sa_data)) 3706 return -EADDRNOTAVAIL; 3707 3708 if (dev->flags & IFF_UP) { 3709 err = dev_uc_add(real_dev, addr->sa_data); 3710 if (err < 0) 3711 return err; 3712 } 3713 3714 ether_addr_copy(old_addr, dev->dev_addr); 3715 eth_hw_addr_set(dev, addr->sa_data); 3716 3717 /* If h/w offloading is available, propagate to the device */ 3718 if (macsec_is_offloaded(macsec)) { 3719 const struct macsec_ops *ops; 3720 struct macsec_context ctx; 3721 3722 ops = macsec_get_ops(macsec, &ctx); 3723 if (!ops) { 3724 err = -EOPNOTSUPP; 3725 goto restore_old_addr; 3726 } 3727 3728 ctx.secy = &macsec->secy; 3729 err = macsec_offload(ops->mdo_upd_secy, &ctx); 3730 if (err) 3731 goto restore_old_addr; 3732 } 3733 3734 if (dev->flags & IFF_UP) 3735 dev_uc_del(real_dev, old_addr); 3736 3737 return 0; 3738 3739 restore_old_addr: 3740 if (dev->flags & IFF_UP) 3741 dev_uc_del(real_dev, addr->sa_data); 3742 3743 eth_hw_addr_set(dev, old_addr); 3744 3745 return err; 3746 } 3747 3748 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 3749 { 3750 struct macsec_dev *macsec = macsec_priv(dev); 3751 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 3752 3753 if (macsec->real_dev->mtu - extra < new_mtu) 3754 return -ERANGE; 3755 3756 WRITE_ONCE(dev->mtu, new_mtu); 3757 3758 return 0; 3759 } 3760 3761 static void macsec_get_stats64(struct net_device *dev, 3762 struct rtnl_link_stats64 *s) 3763 { 3764 if (!dev->tstats) 3765 return; 3766 3767 dev_fetch_sw_netstats(s, dev->tstats); 3768 3769 s->rx_dropped = DEV_STATS_READ(dev, rx_dropped); 3770 s->tx_dropped = DEV_STATS_READ(dev, tx_dropped); 3771 s->rx_errors = DEV_STATS_READ(dev, rx_errors); 3772 } 3773 3774 static int macsec_get_iflink(const struct net_device *dev) 3775 { 3776 return READ_ONCE(macsec_priv(dev)->real_dev->ifindex); 3777 } 3778 3779 static const struct net_device_ops macsec_netdev_ops = { 3780 .ndo_init = macsec_dev_init, 3781 .ndo_uninit = macsec_dev_uninit, 3782 .ndo_open = macsec_dev_open, 3783 .ndo_stop = macsec_dev_stop, 3784 .ndo_fix_features = macsec_fix_features, 3785 .ndo_change_mtu = macsec_change_mtu, 3786 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 3787 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 3788 .ndo_set_mac_address = macsec_set_mac_address, 3789 .ndo_start_xmit = macsec_start_xmit, 3790 .ndo_get_stats64 = macsec_get_stats64, 3791 .ndo_get_iflink = macsec_get_iflink, 3792 }; 3793 3794 static const struct device_type macsec_type = { 3795 .name = "macsec", 3796 }; 3797 3798 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 3799 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 3800 [IFLA_MACSEC_PORT] = { .type = NLA_U16 }, 3801 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 3802 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 3803 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 3804 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 3805 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 3806 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 3807 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 3808 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 3809 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 3810 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 3811 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 3812 [IFLA_MACSEC_OFFLOAD] = { .type = NLA_U8 }, 3813 }; 3814 3815 static void macsec_free_netdev(struct net_device *dev) 3816 { 3817 struct macsec_dev *macsec = macsec_priv(dev); 3818 3819 if (macsec->secy.tx_sc.md_dst) 3820 metadata_dst_free(macsec->secy.tx_sc.md_dst); 3821 free_percpu(macsec->stats); 3822 free_percpu(macsec->secy.tx_sc.stats); 3823 3824 /* Get rid of the macsec's reference to real_dev */ 3825 netdev_put(macsec->real_dev, &macsec->dev_tracker); 3826 } 3827 3828 static void macsec_setup(struct net_device *dev) 3829 { 3830 ether_setup(dev); 3831 dev->min_mtu = 0; 3832 dev->max_mtu = ETH_MAX_MTU; 3833 dev->priv_flags |= IFF_NO_QUEUE; 3834 dev->netdev_ops = &macsec_netdev_ops; 3835 dev->needs_free_netdev = true; 3836 dev->priv_destructor = macsec_free_netdev; 3837 SET_NETDEV_DEVTYPE(dev, &macsec_type); 3838 3839 eth_zero_addr(dev->broadcast); 3840 } 3841 3842 static int macsec_changelink_common(struct net_device *dev, 3843 struct nlattr *data[]) 3844 { 3845 struct macsec_secy *secy; 3846 struct macsec_tx_sc *tx_sc; 3847 3848 secy = &macsec_priv(dev)->secy; 3849 tx_sc = &secy->tx_sc; 3850 3851 if (data[IFLA_MACSEC_ENCODING_SA]) { 3852 struct macsec_tx_sa *tx_sa; 3853 3854 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3855 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 3856 3857 secy->operational = tx_sa && tx_sa->active; 3858 } 3859 3860 if (data[IFLA_MACSEC_ENCRYPT]) 3861 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3862 3863 if (data[IFLA_MACSEC_PROTECT]) 3864 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3865 3866 if (data[IFLA_MACSEC_INC_SCI]) 3867 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3868 3869 if (data[IFLA_MACSEC_ES]) 3870 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3871 3872 if (data[IFLA_MACSEC_SCB]) 3873 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3874 3875 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3876 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3877 3878 if (data[IFLA_MACSEC_VALIDATION]) 3879 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3880 3881 if (data[IFLA_MACSEC_CIPHER_SUITE]) { 3882 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) { 3883 case MACSEC_CIPHER_ID_GCM_AES_128: 3884 case MACSEC_DEFAULT_CIPHER_ID: 3885 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3886 secy->xpn = false; 3887 break; 3888 case MACSEC_CIPHER_ID_GCM_AES_256: 3889 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3890 secy->xpn = false; 3891 break; 3892 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 3893 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3894 secy->xpn = true; 3895 break; 3896 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 3897 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3898 secy->xpn = true; 3899 break; 3900 default: 3901 return -EINVAL; 3902 } 3903 } 3904 3905 if (data[IFLA_MACSEC_WINDOW]) { 3906 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3907 3908 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window 3909 * for XPN cipher suites */ 3910 if (secy->xpn && 3911 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW) 3912 return -EINVAL; 3913 } 3914 3915 return 0; 3916 } 3917 3918 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3919 struct nlattr *data[], 3920 struct netlink_ext_ack *extack) 3921 { 3922 struct macsec_dev *macsec = macsec_priv(dev); 3923 bool macsec_offload_state_change = false; 3924 enum macsec_offload offload; 3925 struct macsec_tx_sc tx_sc; 3926 struct macsec_secy secy; 3927 int ret; 3928 3929 if (!data) 3930 return 0; 3931 3932 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3933 data[IFLA_MACSEC_ICV_LEN] || 3934 data[IFLA_MACSEC_SCI] || 3935 data[IFLA_MACSEC_PORT]) 3936 return -EINVAL; 3937 3938 /* Keep a copy of unmodified secy and tx_sc, in case the offload 3939 * propagation fails, to revert macsec_changelink_common. 3940 */ 3941 memcpy(&secy, &macsec->secy, sizeof(secy)); 3942 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc)); 3943 3944 ret = macsec_changelink_common(dev, data); 3945 if (ret) 3946 goto cleanup; 3947 3948 if (data[IFLA_MACSEC_OFFLOAD]) { 3949 offload = nla_get_u8(data[IFLA_MACSEC_OFFLOAD]); 3950 if (macsec->offload != offload) { 3951 macsec_offload_state_change = true; 3952 ret = macsec_update_offload(dev, offload); 3953 if (ret) 3954 goto cleanup; 3955 } 3956 } 3957 3958 /* If h/w offloading is available, propagate to the device */ 3959 if (!macsec_offload_state_change && macsec_is_offloaded(macsec)) { 3960 const struct macsec_ops *ops; 3961 struct macsec_context ctx; 3962 3963 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3964 if (!ops) { 3965 ret = -EOPNOTSUPP; 3966 goto cleanup; 3967 } 3968 3969 ctx.secy = &macsec->secy; 3970 ret = macsec_offload(ops->mdo_upd_secy, &ctx); 3971 if (ret) 3972 goto cleanup; 3973 } 3974 3975 return 0; 3976 3977 cleanup: 3978 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc)); 3979 memcpy(&macsec->secy, &secy, sizeof(secy)); 3980 3981 return ret; 3982 } 3983 3984 static void macsec_del_dev(struct macsec_dev *macsec) 3985 { 3986 int i; 3987 3988 while (macsec->secy.rx_sc) { 3989 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 3990 3991 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 3992 free_rx_sc(rx_sc); 3993 } 3994 3995 for (i = 0; i < MACSEC_NUM_AN; i++) { 3996 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 3997 3998 if (sa) { 3999 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 4000 clear_tx_sa(sa); 4001 } 4002 } 4003 } 4004 4005 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 4006 { 4007 struct macsec_dev *macsec = macsec_priv(dev); 4008 struct net_device *real_dev = macsec->real_dev; 4009 4010 /* If h/w offloading is available, propagate to the device */ 4011 if (macsec_is_offloaded(macsec)) { 4012 const struct macsec_ops *ops; 4013 struct macsec_context ctx; 4014 4015 ops = macsec_get_ops(netdev_priv(dev), &ctx); 4016 if (ops) { 4017 ctx.secy = &macsec->secy; 4018 macsec_offload(ops->mdo_del_secy, &ctx); 4019 } 4020 } 4021 4022 unregister_netdevice_queue(dev, head); 4023 list_del_rcu(&macsec->secys); 4024 macsec_del_dev(macsec); 4025 netdev_upper_dev_unlink(real_dev, dev); 4026 4027 macsec_generation++; 4028 } 4029 4030 static void macsec_dellink(struct net_device *dev, struct list_head *head) 4031 { 4032 struct macsec_dev *macsec = macsec_priv(dev); 4033 struct net_device *real_dev = macsec->real_dev; 4034 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 4035 4036 macsec_common_dellink(dev, head); 4037 4038 if (list_empty(&rxd->secys)) { 4039 netdev_rx_handler_unregister(real_dev); 4040 kfree(rxd); 4041 } 4042 } 4043 4044 static int register_macsec_dev(struct net_device *real_dev, 4045 struct net_device *dev) 4046 { 4047 struct macsec_dev *macsec = macsec_priv(dev); 4048 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 4049 4050 if (!rxd) { 4051 int err; 4052 4053 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 4054 if (!rxd) 4055 return -ENOMEM; 4056 4057 INIT_LIST_HEAD(&rxd->secys); 4058 4059 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 4060 rxd); 4061 if (err < 0) { 4062 kfree(rxd); 4063 return err; 4064 } 4065 } 4066 4067 list_add_tail_rcu(&macsec->secys, &rxd->secys); 4068 return 0; 4069 } 4070 4071 static bool sci_exists(struct net_device *dev, sci_t sci) 4072 { 4073 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 4074 struct macsec_dev *macsec; 4075 4076 list_for_each_entry(macsec, &rxd->secys, secys) { 4077 if (macsec->secy.sci == sci) 4078 return true; 4079 } 4080 4081 return false; 4082 } 4083 4084 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 4085 { 4086 return make_sci(dev->dev_addr, port); 4087 } 4088 4089 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 4090 { 4091 struct macsec_dev *macsec = macsec_priv(dev); 4092 struct macsec_secy *secy = &macsec->secy; 4093 4094 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 4095 if (!macsec->stats) 4096 return -ENOMEM; 4097 4098 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 4099 if (!secy->tx_sc.stats) 4100 return -ENOMEM; 4101 4102 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL); 4103 if (!secy->tx_sc.md_dst) 4104 /* macsec and secy percpu stats will be freed when unregistering 4105 * net_device in macsec_free_netdev() 4106 */ 4107 return -ENOMEM; 4108 4109 if (sci == MACSEC_UNDEF_SCI) 4110 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4111 4112 secy->netdev = dev; 4113 secy->operational = true; 4114 secy->key_len = DEFAULT_SAK_LEN; 4115 secy->icv_len = icv_len; 4116 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 4117 secy->protect_frames = true; 4118 secy->replay_protect = false; 4119 secy->xpn = DEFAULT_XPN; 4120 4121 secy->sci = sci; 4122 secy->tx_sc.md_dst->u.macsec_info.sci = sci; 4123 secy->tx_sc.active = true; 4124 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 4125 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 4126 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 4127 secy->tx_sc.end_station = false; 4128 secy->tx_sc.scb = false; 4129 4130 return 0; 4131 } 4132 4133 static struct lock_class_key macsec_netdev_addr_lock_key; 4134 4135 static int macsec_newlink(struct net *net, struct net_device *dev, 4136 struct nlattr *tb[], struct nlattr *data[], 4137 struct netlink_ext_ack *extack) 4138 { 4139 struct macsec_dev *macsec = macsec_priv(dev); 4140 rx_handler_func_t *rx_handler; 4141 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4142 struct net_device *real_dev; 4143 int err, mtu; 4144 sci_t sci; 4145 4146 if (!tb[IFLA_LINK]) 4147 return -EINVAL; 4148 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 4149 if (!real_dev) 4150 return -ENODEV; 4151 if (real_dev->type != ARPHRD_ETHER) 4152 return -EINVAL; 4153 4154 dev->priv_flags |= IFF_MACSEC; 4155 4156 macsec->real_dev = real_dev; 4157 4158 if (data && data[IFLA_MACSEC_OFFLOAD]) 4159 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]); 4160 else 4161 /* MACsec offloading is off by default */ 4162 macsec->offload = MACSEC_OFFLOAD_OFF; 4163 4164 /* Check if the offloading mode is supported by the underlying layers */ 4165 if (macsec->offload != MACSEC_OFFLOAD_OFF && 4166 !macsec_check_offload(macsec->offload, macsec)) 4167 return -EOPNOTSUPP; 4168 4169 /* send_sci must be set to true when transmit sci explicitly is set */ 4170 if ((data && data[IFLA_MACSEC_SCI]) && 4171 (data && data[IFLA_MACSEC_INC_SCI])) { 4172 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 4173 4174 if (!send_sci) 4175 return -EINVAL; 4176 } 4177 4178 if (data && data[IFLA_MACSEC_ICV_LEN]) 4179 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4180 mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 4181 if (mtu < 0) 4182 dev->mtu = 0; 4183 else 4184 dev->mtu = mtu; 4185 4186 rx_handler = rtnl_dereference(real_dev->rx_handler); 4187 if (rx_handler && rx_handler != macsec_handle_frame) 4188 return -EBUSY; 4189 4190 err = register_netdevice(dev); 4191 if (err < 0) 4192 return err; 4193 4194 netdev_lockdep_set_classes(dev); 4195 lockdep_set_class(&dev->addr_list_lock, 4196 &macsec_netdev_addr_lock_key); 4197 4198 err = netdev_upper_dev_link(real_dev, dev, extack); 4199 if (err < 0) 4200 goto unregister; 4201 4202 /* need to be already registered so that ->init has run and 4203 * the MAC addr is set 4204 */ 4205 if (data && data[IFLA_MACSEC_SCI]) 4206 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 4207 else if (data && data[IFLA_MACSEC_PORT]) 4208 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 4209 else 4210 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4211 4212 if (rx_handler && sci_exists(real_dev, sci)) { 4213 err = -EBUSY; 4214 goto unlink; 4215 } 4216 4217 err = macsec_add_dev(dev, sci, icv_len); 4218 if (err) 4219 goto unlink; 4220 4221 if (data) { 4222 err = macsec_changelink_common(dev, data); 4223 if (err) 4224 goto del_dev; 4225 } 4226 4227 /* If h/w offloading is available, propagate to the device */ 4228 if (macsec_is_offloaded(macsec)) { 4229 const struct macsec_ops *ops; 4230 struct macsec_context ctx; 4231 4232 ops = macsec_get_ops(macsec, &ctx); 4233 if (ops) { 4234 ctx.secy = &macsec->secy; 4235 err = macsec_offload(ops->mdo_add_secy, &ctx); 4236 if (err) 4237 goto del_dev; 4238 4239 macsec->insert_tx_tag = 4240 macsec_needs_tx_tag(macsec, ops); 4241 } 4242 } 4243 4244 err = register_macsec_dev(real_dev, dev); 4245 if (err < 0) 4246 goto del_dev; 4247 4248 netif_stacked_transfer_operstate(real_dev, dev); 4249 linkwatch_fire_event(dev); 4250 4251 macsec_generation++; 4252 4253 return 0; 4254 4255 del_dev: 4256 macsec_del_dev(macsec); 4257 unlink: 4258 netdev_upper_dev_unlink(real_dev, dev); 4259 unregister: 4260 unregister_netdevice(dev); 4261 return err; 4262 } 4263 4264 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], 4265 struct netlink_ext_ack *extack) 4266 { 4267 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 4268 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4269 int flag; 4270 bool es, scb, sci; 4271 4272 if (!data) 4273 return 0; 4274 4275 if (data[IFLA_MACSEC_CIPHER_SUITE]) 4276 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 4277 4278 if (data[IFLA_MACSEC_ICV_LEN]) { 4279 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4280 if (icv_len != MACSEC_DEFAULT_ICV_LEN) { 4281 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 4282 struct crypto_aead *dummy_tfm; 4283 4284 dummy_tfm = macsec_alloc_tfm(dummy_key, 4285 DEFAULT_SAK_LEN, 4286 icv_len); 4287 if (IS_ERR(dummy_tfm)) 4288 return PTR_ERR(dummy_tfm); 4289 crypto_free_aead(dummy_tfm); 4290 } 4291 } 4292 4293 switch (csid) { 4294 case MACSEC_CIPHER_ID_GCM_AES_128: 4295 case MACSEC_CIPHER_ID_GCM_AES_256: 4296 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 4297 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 4298 case MACSEC_DEFAULT_CIPHER_ID: 4299 if (icv_len < MACSEC_MIN_ICV_LEN || 4300 icv_len > MACSEC_STD_ICV_LEN) 4301 return -EINVAL; 4302 break; 4303 default: 4304 return -EINVAL; 4305 } 4306 4307 if (data[IFLA_MACSEC_ENCODING_SA]) { 4308 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 4309 return -EINVAL; 4310 } 4311 4312 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 4313 flag < IFLA_MACSEC_VALIDATION; 4314 flag++) { 4315 if (data[flag]) { 4316 if (nla_get_u8(data[flag]) > 1) 4317 return -EINVAL; 4318 } 4319 } 4320 4321 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 4322 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 4323 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 4324 4325 if ((sci && (scb || es)) || (scb && es)) 4326 return -EINVAL; 4327 4328 if (data[IFLA_MACSEC_VALIDATION] && 4329 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 4330 return -EINVAL; 4331 4332 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 4333 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 4334 !data[IFLA_MACSEC_WINDOW]) 4335 return -EINVAL; 4336 4337 return 0; 4338 } 4339 4340 static struct net *macsec_get_link_net(const struct net_device *dev) 4341 { 4342 return dev_net(macsec_priv(dev)->real_dev); 4343 } 4344 4345 struct net_device *macsec_get_real_dev(const struct net_device *dev) 4346 { 4347 return macsec_priv(dev)->real_dev; 4348 } 4349 EXPORT_SYMBOL_GPL(macsec_get_real_dev); 4350 4351 bool macsec_netdev_is_offloaded(struct net_device *dev) 4352 { 4353 return macsec_is_offloaded(macsec_priv(dev)); 4354 } 4355 EXPORT_SYMBOL_GPL(macsec_netdev_is_offloaded); 4356 4357 static size_t macsec_get_size(const struct net_device *dev) 4358 { 4359 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ 4360 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ 4361 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ 4362 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ 4363 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ 4364 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ 4365 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ 4366 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ 4367 nla_total_size(1) + /* IFLA_MACSEC_ES */ 4368 nla_total_size(1) + /* IFLA_MACSEC_SCB */ 4369 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ 4370 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ 4371 nla_total_size(1) + /* IFLA_MACSEC_OFFLOAD */ 4372 0; 4373 } 4374 4375 static int macsec_fill_info(struct sk_buff *skb, 4376 const struct net_device *dev) 4377 { 4378 struct macsec_tx_sc *tx_sc; 4379 struct macsec_dev *macsec; 4380 struct macsec_secy *secy; 4381 u64 csid; 4382 4383 macsec = macsec_priv(dev); 4384 secy = &macsec->secy; 4385 tx_sc = &secy->tx_sc; 4386 4387 switch (secy->key_len) { 4388 case MACSEC_GCM_AES_128_SAK_LEN: 4389 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 4390 break; 4391 case MACSEC_GCM_AES_256_SAK_LEN: 4392 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 4393 break; 4394 default: 4395 goto nla_put_failure; 4396 } 4397 4398 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 4399 IFLA_MACSEC_PAD) || 4400 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 4401 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 4402 csid, IFLA_MACSEC_PAD) || 4403 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 4404 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 4405 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 4406 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 4407 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 4408 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 4409 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 4410 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 4411 nla_put_u8(skb, IFLA_MACSEC_OFFLOAD, macsec->offload) || 4412 0) 4413 goto nla_put_failure; 4414 4415 if (secy->replay_protect) { 4416 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 4417 goto nla_put_failure; 4418 } 4419 4420 return 0; 4421 4422 nla_put_failure: 4423 return -EMSGSIZE; 4424 } 4425 4426 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 4427 .kind = "macsec", 4428 .priv_size = sizeof(struct macsec_dev), 4429 .maxtype = IFLA_MACSEC_MAX, 4430 .policy = macsec_rtnl_policy, 4431 .setup = macsec_setup, 4432 .validate = macsec_validate_attr, 4433 .newlink = macsec_newlink, 4434 .changelink = macsec_changelink, 4435 .dellink = macsec_dellink, 4436 .get_size = macsec_get_size, 4437 .fill_info = macsec_fill_info, 4438 .get_link_net = macsec_get_link_net, 4439 }; 4440 4441 static bool is_macsec_master(struct net_device *dev) 4442 { 4443 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 4444 } 4445 4446 static int macsec_notify(struct notifier_block *this, unsigned long event, 4447 void *ptr) 4448 { 4449 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 4450 LIST_HEAD(head); 4451 4452 if (!is_macsec_master(real_dev)) 4453 return NOTIFY_DONE; 4454 4455 switch (event) { 4456 case NETDEV_DOWN: 4457 case NETDEV_UP: 4458 case NETDEV_CHANGE: { 4459 struct macsec_dev *m, *n; 4460 struct macsec_rxh_data *rxd; 4461 4462 rxd = macsec_data_rtnl(real_dev); 4463 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4464 struct net_device *dev = m->secy.netdev; 4465 4466 netif_stacked_transfer_operstate(real_dev, dev); 4467 } 4468 break; 4469 } 4470 case NETDEV_UNREGISTER: { 4471 struct macsec_dev *m, *n; 4472 struct macsec_rxh_data *rxd; 4473 4474 rxd = macsec_data_rtnl(real_dev); 4475 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4476 macsec_common_dellink(m->secy.netdev, &head); 4477 } 4478 4479 netdev_rx_handler_unregister(real_dev); 4480 kfree(rxd); 4481 4482 unregister_netdevice_many(&head); 4483 break; 4484 } 4485 case NETDEV_CHANGEMTU: { 4486 struct macsec_dev *m; 4487 struct macsec_rxh_data *rxd; 4488 4489 rxd = macsec_data_rtnl(real_dev); 4490 list_for_each_entry(m, &rxd->secys, secys) { 4491 struct net_device *dev = m->secy.netdev; 4492 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 4493 macsec_extra_len(true)); 4494 4495 if (dev->mtu > mtu) 4496 dev_set_mtu(dev, mtu); 4497 } 4498 } 4499 } 4500 4501 return NOTIFY_OK; 4502 } 4503 4504 static struct notifier_block macsec_notifier = { 4505 .notifier_call = macsec_notify, 4506 }; 4507 4508 static int __init macsec_init(void) 4509 { 4510 int err; 4511 4512 pr_info("MACsec IEEE 802.1AE\n"); 4513 err = register_netdevice_notifier(&macsec_notifier); 4514 if (err) 4515 return err; 4516 4517 err = rtnl_link_register(&macsec_link_ops); 4518 if (err) 4519 goto notifier; 4520 4521 err = genl_register_family(&macsec_fam); 4522 if (err) 4523 goto rtnl; 4524 4525 return 0; 4526 4527 rtnl: 4528 rtnl_link_unregister(&macsec_link_ops); 4529 notifier: 4530 unregister_netdevice_notifier(&macsec_notifier); 4531 return err; 4532 } 4533 4534 static void __exit macsec_exit(void) 4535 { 4536 genl_unregister_family(&macsec_fam); 4537 rtnl_link_unregister(&macsec_link_ops); 4538 unregister_netdevice_notifier(&macsec_notifier); 4539 rcu_barrier(); 4540 } 4541 4542 module_init(macsec_init); 4543 module_exit(macsec_exit); 4544 4545 MODULE_ALIAS_RTNL_LINK("macsec"); 4546 MODULE_ALIAS_GENL_FAMILY("macsec"); 4547 4548 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 4549 MODULE_LICENSE("GPL v2"); 4550