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 <net/netdev_lock.h> 23 #include <linux/phy.h> 24 #include <linux/byteorder/generic.h> 25 #include <linux/if_arp.h> 26 27 #include <uapi/linux/if_macsec.h> 28 29 /* SecTAG length = macsec_eth_header without the optional SCI */ 30 #define MACSEC_TAG_LEN 6 31 32 struct macsec_eth_header { 33 struct ethhdr eth; 34 /* SecTAG */ 35 u8 tci_an; 36 #if defined(__LITTLE_ENDIAN_BITFIELD) 37 u8 short_length:6, 38 unused:2; 39 #elif defined(__BIG_ENDIAN_BITFIELD) 40 u8 unused:2, 41 short_length:6; 42 #else 43 #error "Please fix <asm/byteorder.h>" 44 #endif 45 __be32 packet_number; 46 u8 secure_channel_id[8]; /* optional */ 47 } __packed; 48 49 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */ 50 #define MIN_NON_SHORT_LEN 48 51 52 #define GCM_AES_IV_LEN 12 53 54 #define for_each_rxsc(secy, sc) \ 55 for (sc = rcu_dereference_bh(secy->rx_sc); \ 56 sc; \ 57 sc = rcu_dereference_bh(sc->next)) 58 #define for_each_rxsc_rtnl(secy, sc) \ 59 for (sc = rtnl_dereference(secy->rx_sc); \ 60 sc; \ 61 sc = rtnl_dereference(sc->next)) 62 63 #define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31))) 64 65 struct gcm_iv_xpn { 66 union { 67 u8 short_secure_channel_id[4]; 68 ssci_t ssci; 69 }; 70 __be64 pn; 71 } __packed; 72 73 struct gcm_iv { 74 union { 75 u8 secure_channel_id[8]; 76 sci_t sci; 77 }; 78 __be32 pn; 79 }; 80 81 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT 82 83 struct pcpu_secy_stats { 84 struct macsec_dev_stats stats; 85 struct u64_stats_sync syncp; 86 }; 87 88 /** 89 * struct macsec_dev - private data 90 * @secy: SecY config 91 * @real_dev: pointer to underlying netdevice 92 * @dev_tracker: refcount tracker for @real_dev reference 93 * @stats: MACsec device stats 94 * @secys: linked list of SecY's on the underlying device 95 * @gro_cells: pointer to the Generic Receive Offload cell 96 * @offload: status of offloading on the MACsec device 97 * @insert_tx_tag: when offloading, device requires to insert an 98 * additional tag 99 */ 100 struct macsec_dev { 101 struct macsec_secy secy; 102 struct net_device *real_dev; 103 netdevice_tracker dev_tracker; 104 struct pcpu_secy_stats __percpu *stats; 105 struct list_head secys; 106 struct gro_cells gro_cells; 107 enum macsec_offload offload; 108 bool insert_tx_tag; 109 }; 110 111 /** 112 * struct macsec_rxh_data - rx_handler private argument 113 * @secys: linked list of SecY's on this underlying device 114 */ 115 struct macsec_rxh_data { 116 struct list_head secys; 117 }; 118 119 static struct macsec_dev *macsec_priv(const struct net_device *dev) 120 { 121 return (struct macsec_dev *)netdev_priv(dev); 122 } 123 124 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev) 125 { 126 return rcu_dereference_bh(dev->rx_handler_data); 127 } 128 129 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev) 130 { 131 return rtnl_dereference(dev->rx_handler_data); 132 } 133 134 struct macsec_cb { 135 struct aead_request *req; 136 union { 137 struct macsec_tx_sa *tx_sa; 138 struct macsec_rx_sa *rx_sa; 139 }; 140 u8 assoc_num; 141 bool valid; 142 bool has_sci; 143 }; 144 145 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr) 146 { 147 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr); 148 149 if (!sa || !sa->active) 150 return NULL; 151 152 if (!refcount_inc_not_zero(&sa->refcnt)) 153 return NULL; 154 155 return sa; 156 } 157 158 static void free_rx_sc_rcu(struct rcu_head *head) 159 { 160 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head); 161 162 free_percpu(rx_sc->stats); 163 kfree(rx_sc); 164 } 165 166 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc) 167 { 168 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL; 169 } 170 171 static void macsec_rxsc_put(struct macsec_rx_sc *sc) 172 { 173 if (refcount_dec_and_test(&sc->refcnt)) 174 call_rcu(&sc->rcu_head, free_rx_sc_rcu); 175 } 176 177 static void free_rxsa(struct rcu_head *head) 178 { 179 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu); 180 181 crypto_free_aead(sa->key.tfm); 182 free_percpu(sa->stats); 183 kfree(sa); 184 } 185 186 static void macsec_rxsa_put(struct macsec_rx_sa *sa) 187 { 188 if (refcount_dec_and_test(&sa->refcnt)) 189 call_rcu(&sa->rcu, free_rxsa); 190 } 191 192 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr) 193 { 194 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr); 195 196 if (!sa || !sa->active) 197 return NULL; 198 199 if (!refcount_inc_not_zero(&sa->refcnt)) 200 return NULL; 201 202 return sa; 203 } 204 205 static void free_txsa(struct rcu_head *head) 206 { 207 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu); 208 209 crypto_free_aead(sa->key.tfm); 210 free_percpu(sa->stats); 211 kfree(sa); 212 } 213 214 static void macsec_txsa_put(struct macsec_tx_sa *sa) 215 { 216 if (refcount_dec_and_test(&sa->refcnt)) 217 call_rcu(&sa->rcu, free_txsa); 218 } 219 220 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) 221 { 222 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); 223 return (struct macsec_cb *)skb->cb; 224 } 225 226 #define MACSEC_PORT_SCB (0x0000) 227 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL) 228 #define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff) 229 230 #define MACSEC_GCM_AES_128_SAK_LEN 16 231 #define MACSEC_GCM_AES_256_SAK_LEN 32 232 233 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN 234 #define DEFAULT_XPN false 235 #define DEFAULT_SEND_SCI true 236 #define DEFAULT_ENCRYPT false 237 #define DEFAULT_ENCODING_SA 0 238 #define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1)) 239 240 static sci_t make_sci(const u8 *addr, __be16 port) 241 { 242 sci_t sci; 243 244 memcpy(&sci, addr, ETH_ALEN); 245 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); 246 247 return sci; 248 } 249 250 static sci_t macsec_active_sci(struct macsec_secy *secy) 251 { 252 struct macsec_rx_sc *rx_sc = rcu_dereference_bh(secy->rx_sc); 253 254 /* Case single RX SC */ 255 if (rx_sc && !rcu_dereference_bh(rx_sc->next)) 256 return (rx_sc->active) ? rx_sc->sci : 0; 257 /* Case no RX SC or multiple */ 258 else 259 return 0; 260 } 261 262 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present, 263 struct macsec_rxh_data *rxd) 264 { 265 struct macsec_dev *macsec; 266 sci_t sci = 0; 267 268 /* SC = 1 */ 269 if (sci_present) { 270 memcpy(&sci, hdr->secure_channel_id, 271 sizeof(hdr->secure_channel_id)); 272 /* SC = 0; ES = 0 */ 273 } else if ((!(hdr->tci_an & (MACSEC_TCI_ES | MACSEC_TCI_SC))) && 274 (list_is_singular(&rxd->secys))) { 275 /* Only one SECY should exist on this scenario */ 276 macsec = list_first_or_null_rcu(&rxd->secys, struct macsec_dev, 277 secys); 278 if (macsec) 279 return macsec_active_sci(&macsec->secy); 280 } else { 281 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); 282 } 283 284 return sci; 285 } 286 287 static unsigned int macsec_sectag_len(bool sci_present) 288 { 289 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); 290 } 291 292 static unsigned int macsec_hdr_len(bool sci_present) 293 { 294 return macsec_sectag_len(sci_present) + ETH_HLEN; 295 } 296 297 static unsigned int macsec_extra_len(bool sci_present) 298 { 299 return macsec_sectag_len(sci_present) + sizeof(__be16); 300 } 301 302 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ 303 static void macsec_fill_sectag(struct macsec_eth_header *h, 304 const struct macsec_secy *secy, u32 pn, 305 bool sci_present) 306 { 307 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 308 309 memset(&h->tci_an, 0, macsec_sectag_len(sci_present)); 310 h->eth.h_proto = htons(ETH_P_MACSEC); 311 312 if (sci_present) { 313 h->tci_an |= MACSEC_TCI_SC; 314 memcpy(&h->secure_channel_id, &secy->sci, 315 sizeof(h->secure_channel_id)); 316 } else { 317 if (tx_sc->end_station) 318 h->tci_an |= MACSEC_TCI_ES; 319 if (tx_sc->scb) 320 h->tci_an |= MACSEC_TCI_SCB; 321 } 322 323 h->packet_number = htonl(pn); 324 325 /* with GCM, C/E clear for !encrypt, both set for encrypt */ 326 if (tx_sc->encrypt) 327 h->tci_an |= MACSEC_TCI_CONFID; 328 else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN) 329 h->tci_an |= MACSEC_TCI_C; 330 331 h->tci_an |= tx_sc->encoding_sa; 332 } 333 334 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) 335 { 336 if (data_len < MIN_NON_SHORT_LEN) 337 h->short_length = data_len; 338 } 339 340 /* Checks if a MACsec interface is being offloaded to an hardware engine */ 341 static bool macsec_is_offloaded(struct macsec_dev *macsec) 342 { 343 if (macsec->offload == MACSEC_OFFLOAD_MAC || 344 macsec->offload == MACSEC_OFFLOAD_PHY) 345 return true; 346 347 return false; 348 } 349 350 /* Checks if underlying layers implement MACsec offloading functions. */ 351 static bool macsec_check_offload(enum macsec_offload offload, 352 struct macsec_dev *macsec) 353 { 354 if (!macsec || !macsec->real_dev) 355 return false; 356 357 if (offload == MACSEC_OFFLOAD_PHY) 358 return macsec->real_dev->phydev && 359 macsec->real_dev->phydev->macsec_ops; 360 else if (offload == MACSEC_OFFLOAD_MAC) 361 return macsec->real_dev->features & NETIF_F_HW_MACSEC && 362 macsec->real_dev->macsec_ops; 363 364 return false; 365 } 366 367 static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload, 368 struct macsec_dev *macsec, 369 struct macsec_context *ctx) 370 { 371 if (ctx) { 372 memset(ctx, 0, sizeof(*ctx)); 373 ctx->offload = offload; 374 375 if (offload == MACSEC_OFFLOAD_PHY) 376 ctx->phydev = macsec->real_dev->phydev; 377 else if (offload == MACSEC_OFFLOAD_MAC) 378 ctx->netdev = macsec->real_dev; 379 } 380 381 if (offload == MACSEC_OFFLOAD_PHY) 382 return macsec->real_dev->phydev->macsec_ops; 383 else 384 return macsec->real_dev->macsec_ops; 385 } 386 387 /* Returns a pointer to the MACsec ops struct if any and updates the MACsec 388 * context device reference if provided. 389 */ 390 static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec, 391 struct macsec_context *ctx) 392 { 393 if (!macsec_check_offload(macsec->offload, macsec)) 394 return NULL; 395 396 return __macsec_get_ops(macsec->offload, macsec, ctx); 397 } 398 399 /* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */ 400 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn) 401 { 402 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; 403 int len = skb->len - 2 * ETH_ALEN; 404 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; 405 406 /* a) It comprises at least 17 octets */ 407 if (skb->len <= 16) 408 return false; 409 410 /* b) MACsec EtherType: already checked */ 411 412 /* c) V bit is clear */ 413 if (h->tci_an & MACSEC_TCI_VERSION) 414 return false; 415 416 /* d) ES or SCB => !SC */ 417 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && 418 (h->tci_an & MACSEC_TCI_SC)) 419 return false; 420 421 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ 422 if (h->unused) 423 return false; 424 425 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */ 426 if (!h->packet_number && !xpn) 427 return false; 428 429 /* length check, f) g) h) i) */ 430 if (h->short_length) 431 return len == extra_len + h->short_length; 432 return len >= extra_len + MIN_NON_SHORT_LEN; 433 } 434 435 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) 436 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN 437 438 static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn, 439 salt_t salt) 440 { 441 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv; 442 443 gcm_iv->ssci = ssci ^ salt.ssci; 444 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn; 445 } 446 447 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) 448 { 449 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; 450 451 gcm_iv->sci = sci; 452 gcm_iv->pn = htonl(pn); 453 } 454 455 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) 456 { 457 return (struct macsec_eth_header *)skb_mac_header(skb); 458 } 459 460 static void __macsec_pn_wrapped(struct macsec_secy *secy, 461 struct macsec_tx_sa *tx_sa) 462 { 463 pr_debug("PN wrapped, transitioning to !oper\n"); 464 tx_sa->active = false; 465 if (secy->protect_frames) 466 secy->operational = false; 467 } 468 469 void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa) 470 { 471 spin_lock_bh(&tx_sa->lock); 472 __macsec_pn_wrapped(secy, tx_sa); 473 spin_unlock_bh(&tx_sa->lock); 474 } 475 EXPORT_SYMBOL_GPL(macsec_pn_wrapped); 476 477 static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa, 478 struct macsec_secy *secy) 479 { 480 pn_t pn; 481 482 spin_lock_bh(&tx_sa->lock); 483 484 pn = tx_sa->next_pn_halves; 485 if (secy->xpn) 486 tx_sa->next_pn++; 487 else 488 tx_sa->next_pn_halves.lower++; 489 490 if (tx_sa->next_pn == 0) 491 __macsec_pn_wrapped(secy, tx_sa); 492 spin_unlock_bh(&tx_sa->lock); 493 494 return pn; 495 } 496 497 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) 498 { 499 struct macsec_dev *macsec = netdev_priv(dev); 500 501 skb->dev = macsec->real_dev; 502 skb_reset_mac_header(skb); 503 skb->protocol = eth_hdr(skb)->h_proto; 504 } 505 506 static unsigned int macsec_msdu_len(struct sk_buff *skb) 507 { 508 struct macsec_dev *macsec = macsec_priv(skb->dev); 509 struct macsec_secy *secy = &macsec->secy; 510 bool sci_present = macsec_skb_cb(skb)->has_sci; 511 512 return skb->len - macsec_hdr_len(sci_present) - secy->icv_len; 513 } 514 515 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, 516 struct macsec_tx_sa *tx_sa) 517 { 518 unsigned int msdu_len = macsec_msdu_len(skb); 519 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); 520 521 u64_stats_update_begin(&txsc_stats->syncp); 522 if (tx_sc->encrypt) { 523 txsc_stats->stats.OutOctetsEncrypted += msdu_len; 524 txsc_stats->stats.OutPktsEncrypted++; 525 this_cpu_inc(tx_sa->stats->OutPktsEncrypted); 526 } else { 527 txsc_stats->stats.OutOctetsProtected += msdu_len; 528 txsc_stats->stats.OutPktsProtected++; 529 this_cpu_inc(tx_sa->stats->OutPktsProtected); 530 } 531 u64_stats_update_end(&txsc_stats->syncp); 532 } 533 534 static void count_tx(struct net_device *dev, int ret, int len) 535 { 536 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) 537 dev_sw_netstats_tx_add(dev, 1, len); 538 } 539 540 static void macsec_encrypt_done(void *data, int err) 541 { 542 struct sk_buff *skb = data; 543 struct net_device *dev = skb->dev; 544 struct macsec_dev *macsec = macsec_priv(dev); 545 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 546 int len, ret; 547 548 aead_request_free(macsec_skb_cb(skb)->req); 549 550 rcu_read_lock_bh(); 551 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 552 /* packet is encrypted/protected so tx_bytes must be calculated */ 553 len = macsec_msdu_len(skb) + 2 * ETH_ALEN; 554 macsec_encrypt_finish(skb, dev); 555 ret = dev_queue_xmit(skb); 556 count_tx(dev, ret, len); 557 rcu_read_unlock_bh(); 558 559 macsec_txsa_put(sa); 560 dev_put(dev); 561 } 562 563 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, 564 unsigned char **iv, 565 struct scatterlist **sg, 566 int num_frags) 567 { 568 size_t size, iv_offset, sg_offset; 569 struct aead_request *req; 570 void *tmp; 571 572 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); 573 iv_offset = size; 574 size += GCM_AES_IV_LEN; 575 576 size = ALIGN(size, __alignof__(struct scatterlist)); 577 sg_offset = size; 578 size += sizeof(struct scatterlist) * num_frags; 579 580 tmp = kmalloc(size, GFP_ATOMIC); 581 if (!tmp) 582 return NULL; 583 584 *iv = (unsigned char *)(tmp + iv_offset); 585 *sg = (struct scatterlist *)(tmp + sg_offset); 586 req = tmp; 587 588 aead_request_set_tfm(req, tfm); 589 590 return req; 591 } 592 593 static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 594 struct net_device *dev) 595 { 596 int ret; 597 struct scatterlist *sg; 598 struct sk_buff *trailer; 599 unsigned char *iv; 600 struct ethhdr *eth; 601 struct macsec_eth_header *hh; 602 size_t unprotected_len; 603 struct aead_request *req; 604 struct macsec_secy *secy; 605 struct macsec_tx_sc *tx_sc; 606 struct macsec_tx_sa *tx_sa; 607 struct macsec_dev *macsec = macsec_priv(dev); 608 bool sci_present; 609 pn_t pn; 610 611 secy = &macsec->secy; 612 tx_sc = &secy->tx_sc; 613 614 /* 10.5.1 TX SA assignment */ 615 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); 616 if (!tx_sa) { 617 secy->operational = false; 618 kfree_skb(skb); 619 return ERR_PTR(-EINVAL); 620 } 621 622 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || 623 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { 624 struct sk_buff *nskb = skb_copy_expand(skb, 625 MACSEC_NEEDED_HEADROOM, 626 MACSEC_NEEDED_TAILROOM, 627 GFP_ATOMIC); 628 if (likely(nskb)) { 629 consume_skb(skb); 630 skb = nskb; 631 } else { 632 macsec_txsa_put(tx_sa); 633 kfree_skb(skb); 634 return ERR_PTR(-ENOMEM); 635 } 636 } else { 637 skb = skb_unshare(skb, GFP_ATOMIC); 638 if (!skb) { 639 macsec_txsa_put(tx_sa); 640 return ERR_PTR(-ENOMEM); 641 } 642 } 643 644 unprotected_len = skb->len; 645 eth = eth_hdr(skb); 646 sci_present = macsec_send_sci(secy); 647 hh = skb_push(skb, macsec_extra_len(sci_present)); 648 memmove(hh, eth, 2 * ETH_ALEN); 649 650 pn = tx_sa_update_pn(tx_sa, secy); 651 if (pn.full64 == 0) { 652 macsec_txsa_put(tx_sa); 653 kfree_skb(skb); 654 return ERR_PTR(-ENOLINK); 655 } 656 macsec_fill_sectag(hh, secy, pn.lower, sci_present); 657 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); 658 659 skb_put(skb, secy->icv_len); 660 661 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { 662 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 663 664 u64_stats_update_begin(&secy_stats->syncp); 665 secy_stats->stats.OutPktsTooLong++; 666 u64_stats_update_end(&secy_stats->syncp); 667 668 macsec_txsa_put(tx_sa); 669 kfree_skb(skb); 670 return ERR_PTR(-EINVAL); 671 } 672 673 ret = skb_cow_data(skb, 0, &trailer); 674 if (unlikely(ret < 0)) { 675 macsec_txsa_put(tx_sa); 676 kfree_skb(skb); 677 return ERR_PTR(ret); 678 } 679 680 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret); 681 if (!req) { 682 macsec_txsa_put(tx_sa); 683 kfree_skb(skb); 684 return ERR_PTR(-ENOMEM); 685 } 686 687 if (secy->xpn) 688 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt); 689 else 690 macsec_fill_iv(iv, secy->sci, pn.lower); 691 692 sg_init_table(sg, ret); 693 ret = skb_to_sgvec(skb, sg, 0, skb->len); 694 if (unlikely(ret < 0)) { 695 aead_request_free(req); 696 macsec_txsa_put(tx_sa); 697 kfree_skb(skb); 698 return ERR_PTR(ret); 699 } 700 701 if (tx_sc->encrypt) { 702 int len = skb->len - macsec_hdr_len(sci_present) - 703 secy->icv_len; 704 aead_request_set_crypt(req, sg, sg, len, iv); 705 aead_request_set_ad(req, macsec_hdr_len(sci_present)); 706 } else { 707 aead_request_set_crypt(req, sg, sg, 0, iv); 708 aead_request_set_ad(req, skb->len - secy->icv_len); 709 } 710 711 macsec_skb_cb(skb)->req = req; 712 macsec_skb_cb(skb)->tx_sa = tx_sa; 713 macsec_skb_cb(skb)->has_sci = sci_present; 714 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 715 716 dev_hold(skb->dev); 717 ret = crypto_aead_encrypt(req); 718 if (ret == -EINPROGRESS) { 719 return ERR_PTR(ret); 720 } else if (ret != 0) { 721 dev_put(skb->dev); 722 kfree_skb(skb); 723 aead_request_free(req); 724 macsec_txsa_put(tx_sa); 725 return ERR_PTR(-EINVAL); 726 } 727 728 dev_put(skb->dev); 729 aead_request_free(req); 730 macsec_txsa_put(tx_sa); 731 732 return skb; 733 } 734 735 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 736 { 737 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 738 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 739 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 740 u32 lowest_pn = 0; 741 742 spin_lock(&rx_sa->lock); 743 if (rx_sa->next_pn_halves.lower >= secy->replay_window) 744 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window; 745 746 /* Now perform replay protection check again 747 * (see IEEE 802.1AE-2006 figure 10-5) 748 */ 749 if (secy->replay_protect && pn < lowest_pn && 750 (!secy->xpn || pn_same_half(pn, lowest_pn))) { 751 spin_unlock(&rx_sa->lock); 752 u64_stats_update_begin(&rxsc_stats->syncp); 753 rxsc_stats->stats.InPktsLate++; 754 u64_stats_update_end(&rxsc_stats->syncp); 755 DEV_STATS_INC(secy->netdev, rx_dropped); 756 return false; 757 } 758 759 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 760 unsigned int msdu_len = macsec_msdu_len(skb); 761 u64_stats_update_begin(&rxsc_stats->syncp); 762 if (hdr->tci_an & MACSEC_TCI_E) 763 rxsc_stats->stats.InOctetsDecrypted += msdu_len; 764 else 765 rxsc_stats->stats.InOctetsValidated += msdu_len; 766 u64_stats_update_end(&rxsc_stats->syncp); 767 } 768 769 if (!macsec_skb_cb(skb)->valid) { 770 spin_unlock(&rx_sa->lock); 771 772 /* 10.6.5 */ 773 if (hdr->tci_an & MACSEC_TCI_C || 774 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 775 u64_stats_update_begin(&rxsc_stats->syncp); 776 rxsc_stats->stats.InPktsNotValid++; 777 u64_stats_update_end(&rxsc_stats->syncp); 778 this_cpu_inc(rx_sa->stats->InPktsNotValid); 779 DEV_STATS_INC(secy->netdev, rx_errors); 780 return false; 781 } 782 783 u64_stats_update_begin(&rxsc_stats->syncp); 784 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 785 rxsc_stats->stats.InPktsInvalid++; 786 this_cpu_inc(rx_sa->stats->InPktsInvalid); 787 } else if (pn < lowest_pn) { 788 rxsc_stats->stats.InPktsDelayed++; 789 } else { 790 rxsc_stats->stats.InPktsUnchecked++; 791 } 792 u64_stats_update_end(&rxsc_stats->syncp); 793 } else { 794 u64_stats_update_begin(&rxsc_stats->syncp); 795 if (pn < lowest_pn) { 796 rxsc_stats->stats.InPktsDelayed++; 797 } else { 798 rxsc_stats->stats.InPktsOK++; 799 this_cpu_inc(rx_sa->stats->InPktsOK); 800 } 801 u64_stats_update_end(&rxsc_stats->syncp); 802 803 // Instead of "pn >=" - to support pn overflow in xpn 804 if (pn + 1 > rx_sa->next_pn_halves.lower) { 805 rx_sa->next_pn_halves.lower = pn + 1; 806 } else if (secy->xpn && 807 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) { 808 rx_sa->next_pn_halves.upper++; 809 rx_sa->next_pn_halves.lower = pn + 1; 810 } 811 812 spin_unlock(&rx_sa->lock); 813 } 814 815 return true; 816 } 817 818 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 819 { 820 skb->pkt_type = PACKET_HOST; 821 skb->protocol = eth_type_trans(skb, dev); 822 823 skb_reset_network_header(skb); 824 if (!skb_transport_header_was_set(skb)) 825 skb_reset_transport_header(skb); 826 skb_reset_mac_len(skb); 827 } 828 829 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 830 { 831 skb->ip_summed = CHECKSUM_NONE; 832 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 833 skb_pull(skb, hdr_len); 834 pskb_trim_unique(skb, skb->len - icv_len); 835 } 836 837 static void count_rx(struct net_device *dev, int len) 838 { 839 dev_sw_netstats_rx_add(dev, len); 840 } 841 842 static void macsec_decrypt_done(void *data, int err) 843 { 844 struct sk_buff *skb = data; 845 struct net_device *dev = skb->dev; 846 struct macsec_dev *macsec = macsec_priv(dev); 847 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 848 struct macsec_rx_sc *rx_sc = rx_sa->sc; 849 int len; 850 u32 pn; 851 852 aead_request_free(macsec_skb_cb(skb)->req); 853 854 if (!err) 855 macsec_skb_cb(skb)->valid = true; 856 857 rcu_read_lock_bh(); 858 pn = ntohl(macsec_ethhdr(skb)->packet_number); 859 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 860 rcu_read_unlock_bh(); 861 kfree_skb(skb); 862 goto out; 863 } 864 865 macsec_finalize_skb(skb, macsec->secy.icv_len, 866 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 867 len = skb->len; 868 macsec_reset_skb(skb, macsec->secy.netdev); 869 870 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS) 871 count_rx(dev, len); 872 873 rcu_read_unlock_bh(); 874 875 out: 876 macsec_rxsa_put(rx_sa); 877 macsec_rxsc_put(rx_sc); 878 dev_put(dev); 879 } 880 881 static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 882 struct net_device *dev, 883 struct macsec_rx_sa *rx_sa, 884 sci_t sci, 885 struct macsec_secy *secy) 886 { 887 int ret; 888 struct scatterlist *sg; 889 struct sk_buff *trailer; 890 unsigned char *iv; 891 struct aead_request *req; 892 struct macsec_eth_header *hdr; 893 u32 hdr_pn; 894 u16 icv_len = secy->icv_len; 895 896 macsec_skb_cb(skb)->valid = false; 897 skb = skb_share_check(skb, GFP_ATOMIC); 898 if (!skb) 899 return ERR_PTR(-ENOMEM); 900 901 ret = skb_cow_data(skb, 0, &trailer); 902 if (unlikely(ret < 0)) { 903 kfree_skb(skb); 904 return ERR_PTR(ret); 905 } 906 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret); 907 if (!req) { 908 kfree_skb(skb); 909 return ERR_PTR(-ENOMEM); 910 } 911 912 hdr = (struct macsec_eth_header *)skb->data; 913 hdr_pn = ntohl(hdr->packet_number); 914 915 if (secy->xpn) { 916 pn_t recovered_pn = rx_sa->next_pn_halves; 917 918 recovered_pn.lower = hdr_pn; 919 if (hdr_pn < rx_sa->next_pn_halves.lower && 920 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower)) 921 recovered_pn.upper++; 922 923 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64, 924 rx_sa->key.salt); 925 } else { 926 macsec_fill_iv(iv, sci, hdr_pn); 927 } 928 929 sg_init_table(sg, ret); 930 ret = skb_to_sgvec(skb, sg, 0, skb->len); 931 if (unlikely(ret < 0)) { 932 aead_request_free(req); 933 kfree_skb(skb); 934 return ERR_PTR(ret); 935 } 936 937 if (hdr->tci_an & MACSEC_TCI_E) { 938 /* confidentiality: ethernet + macsec header 939 * authenticated, encrypted payload 940 */ 941 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 942 943 aead_request_set_crypt(req, sg, sg, len, iv); 944 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 945 skb = skb_unshare(skb, GFP_ATOMIC); 946 if (!skb) { 947 aead_request_free(req); 948 return ERR_PTR(-ENOMEM); 949 } 950 } else { 951 /* integrity only: all headers + data authenticated */ 952 aead_request_set_crypt(req, sg, sg, icv_len, iv); 953 aead_request_set_ad(req, skb->len - icv_len); 954 } 955 956 macsec_skb_cb(skb)->req = req; 957 skb->dev = dev; 958 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 959 960 dev_hold(dev); 961 ret = crypto_aead_decrypt(req); 962 if (ret == -EINPROGRESS) { 963 return ERR_PTR(ret); 964 } else if (ret != 0) { 965 /* decryption/authentication failed 966 * 10.6 if validateFrames is disabled, deliver anyway 967 */ 968 if (ret != -EBADMSG) { 969 kfree_skb(skb); 970 skb = ERR_PTR(ret); 971 } 972 } else { 973 macsec_skb_cb(skb)->valid = true; 974 } 975 dev_put(dev); 976 977 aead_request_free(req); 978 979 return skb; 980 } 981 982 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 983 { 984 struct macsec_rx_sc *rx_sc; 985 986 for_each_rxsc(secy, rx_sc) { 987 if (rx_sc->sci == sci) 988 return rx_sc; 989 } 990 991 return NULL; 992 } 993 994 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 995 { 996 struct macsec_rx_sc *rx_sc; 997 998 for_each_rxsc_rtnl(secy, rx_sc) { 999 if (rx_sc->sci == sci) 1000 return rx_sc; 1001 } 1002 1003 return NULL; 1004 } 1005 1006 static enum rx_handler_result handle_not_macsec(struct sk_buff *skb) 1007 { 1008 /* Deliver to the uncontrolled port by default */ 1009 enum rx_handler_result ret = RX_HANDLER_PASS; 1010 struct ethhdr *hdr = eth_hdr(skb); 1011 struct metadata_dst *md_dst; 1012 struct macsec_rxh_data *rxd; 1013 struct macsec_dev *macsec; 1014 bool is_macsec_md_dst; 1015 1016 rcu_read_lock(); 1017 rxd = macsec_data_rcu(skb->dev); 1018 md_dst = skb_metadata_dst(skb); 1019 is_macsec_md_dst = md_dst && md_dst->type == METADATA_MACSEC; 1020 1021 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1022 struct sk_buff *nskb; 1023 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 1024 struct net_device *ndev = macsec->secy.netdev; 1025 1026 /* If h/w offloading is enabled, HW decodes frames and strips 1027 * the SecTAG, so we have to deduce which port to deliver to. 1028 */ 1029 if (macsec_is_offloaded(macsec) && netif_running(ndev)) { 1030 const struct macsec_ops *ops; 1031 1032 ops = macsec_get_ops(macsec, NULL); 1033 1034 if (ops->rx_uses_md_dst && !is_macsec_md_dst) 1035 continue; 1036 1037 if (is_macsec_md_dst) { 1038 struct macsec_rx_sc *rx_sc; 1039 1040 /* All drivers that implement MACsec offload 1041 * support using skb metadata destinations must 1042 * indicate that they do so. 1043 */ 1044 DEBUG_NET_WARN_ON_ONCE(!ops->rx_uses_md_dst); 1045 rx_sc = find_rx_sc(&macsec->secy, 1046 md_dst->u.macsec_info.sci); 1047 if (!rx_sc) 1048 continue; 1049 /* device indicated macsec offload occurred */ 1050 skb->dev = ndev; 1051 skb->pkt_type = PACKET_HOST; 1052 eth_skb_pkt_type(skb, ndev); 1053 ret = RX_HANDLER_ANOTHER; 1054 goto out; 1055 } 1056 1057 /* This datapath is insecure because it is unable to 1058 * enforce isolation of broadcast/multicast traffic and 1059 * unicast traffic with promiscuous mode on the macsec 1060 * netdev. Since the core stack has no mechanism to 1061 * check that the hardware did indeed receive MACsec 1062 * traffic, it is possible that the response handling 1063 * done by the MACsec port was to a plaintext packet. 1064 * This violates the MACsec protocol standard. 1065 */ 1066 if (ether_addr_equal_64bits(hdr->h_dest, 1067 ndev->dev_addr)) { 1068 /* exact match, divert skb to this port */ 1069 skb->dev = ndev; 1070 skb->pkt_type = PACKET_HOST; 1071 ret = RX_HANDLER_ANOTHER; 1072 goto out; 1073 } else if (is_multicast_ether_addr_64bits( 1074 hdr->h_dest)) { 1075 /* multicast frame, deliver on this port too */ 1076 nskb = skb_clone(skb, GFP_ATOMIC); 1077 if (!nskb) 1078 break; 1079 1080 nskb->dev = ndev; 1081 eth_skb_pkt_type(nskb, ndev); 1082 1083 __netif_rx(nskb); 1084 } else if (ndev->flags & IFF_PROMISC) { 1085 skb->dev = ndev; 1086 skb->pkt_type = PACKET_HOST; 1087 ret = RX_HANDLER_ANOTHER; 1088 goto out; 1089 } 1090 1091 continue; 1092 } 1093 1094 /* 10.6 If the management control validateFrames is not 1095 * Strict, frames without a SecTAG are received, counted, and 1096 * delivered to the Controlled Port 1097 */ 1098 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1099 u64_stats_update_begin(&secy_stats->syncp); 1100 secy_stats->stats.InPktsNoTag++; 1101 u64_stats_update_end(&secy_stats->syncp); 1102 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1103 continue; 1104 } 1105 1106 /* deliver on this port */ 1107 nskb = skb_clone(skb, GFP_ATOMIC); 1108 if (!nskb) 1109 break; 1110 1111 nskb->dev = ndev; 1112 1113 if (__netif_rx(nskb) == NET_RX_SUCCESS) { 1114 u64_stats_update_begin(&secy_stats->syncp); 1115 secy_stats->stats.InPktsUntagged++; 1116 u64_stats_update_end(&secy_stats->syncp); 1117 } 1118 } 1119 1120 out: 1121 rcu_read_unlock(); 1122 return ret; 1123 } 1124 1125 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 1126 { 1127 struct sk_buff *skb = *pskb; 1128 struct net_device *dev = skb->dev; 1129 struct macsec_eth_header *hdr; 1130 struct macsec_secy *secy = NULL; 1131 struct macsec_rx_sc *rx_sc; 1132 struct macsec_rx_sa *rx_sa; 1133 struct macsec_rxh_data *rxd; 1134 struct macsec_dev *macsec; 1135 unsigned int len; 1136 sci_t sci = 0; 1137 u32 hdr_pn; 1138 bool cbit; 1139 struct pcpu_rx_sc_stats *rxsc_stats; 1140 struct pcpu_secy_stats *secy_stats; 1141 bool pulled_sci; 1142 int ret; 1143 1144 if (skb_headroom(skb) < ETH_HLEN) 1145 goto drop_direct; 1146 1147 hdr = macsec_ethhdr(skb); 1148 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) 1149 return handle_not_macsec(skb); 1150 1151 skb = skb_unshare(skb, GFP_ATOMIC); 1152 *pskb = skb; 1153 if (!skb) 1154 return RX_HANDLER_CONSUMED; 1155 1156 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1157 if (!pulled_sci) { 1158 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1159 goto drop_direct; 1160 } 1161 1162 hdr = macsec_ethhdr(skb); 1163 1164 /* Frames with a SecTAG that has the TCI E bit set but the C 1165 * bit clear are discarded, as this reserved encoding is used 1166 * to identify frames with a SecTAG that are not to be 1167 * delivered to the Controlled Port. 1168 */ 1169 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1170 return RX_HANDLER_PASS; 1171 1172 /* now, pull the extra length */ 1173 if (hdr->tci_an & MACSEC_TCI_SC) { 1174 if (!pulled_sci) 1175 goto drop_direct; 1176 } 1177 1178 /* ethernet header is part of crypto processing */ 1179 skb_push(skb, ETH_HLEN); 1180 1181 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1182 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1183 1184 rcu_read_lock(); 1185 rxd = macsec_data_rcu(skb->dev); 1186 1187 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci, rxd); 1188 if (!sci) 1189 goto drop_nosc; 1190 1191 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1192 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1193 1194 sc = sc ? macsec_rxsc_get(sc) : NULL; 1195 1196 if (sc) { 1197 secy = &macsec->secy; 1198 rx_sc = sc; 1199 break; 1200 } 1201 } 1202 1203 if (!secy) 1204 goto nosci; 1205 1206 dev = secy->netdev; 1207 macsec = macsec_priv(dev); 1208 secy_stats = this_cpu_ptr(macsec->stats); 1209 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1210 1211 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) { 1212 u64_stats_update_begin(&secy_stats->syncp); 1213 secy_stats->stats.InPktsBadTag++; 1214 u64_stats_update_end(&secy_stats->syncp); 1215 DEV_STATS_INC(secy->netdev, rx_errors); 1216 goto drop_nosa; 1217 } 1218 1219 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1220 if (!rx_sa) { 1221 /* 10.6.1 if the SA is not in use */ 1222 1223 /* If validateFrames is Strict or the C bit in the 1224 * SecTAG is set, discard 1225 */ 1226 if (hdr->tci_an & MACSEC_TCI_C || 1227 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1228 u64_stats_update_begin(&rxsc_stats->syncp); 1229 rxsc_stats->stats.InPktsNotUsingSA++; 1230 u64_stats_update_end(&rxsc_stats->syncp); 1231 DEV_STATS_INC(secy->netdev, rx_errors); 1232 goto drop_nosa; 1233 } 1234 1235 /* not Strict, the frame (with the SecTAG and ICV 1236 * removed) is delivered to the Controlled Port. 1237 */ 1238 u64_stats_update_begin(&rxsc_stats->syncp); 1239 rxsc_stats->stats.InPktsUnusedSA++; 1240 u64_stats_update_end(&rxsc_stats->syncp); 1241 goto deliver; 1242 } 1243 1244 /* First, PN check to avoid decrypting obviously wrong packets */ 1245 hdr_pn = ntohl(hdr->packet_number); 1246 if (secy->replay_protect) { 1247 bool late; 1248 1249 spin_lock(&rx_sa->lock); 1250 late = rx_sa->next_pn_halves.lower >= secy->replay_window && 1251 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window); 1252 1253 if (secy->xpn) 1254 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn); 1255 spin_unlock(&rx_sa->lock); 1256 1257 if (late) { 1258 u64_stats_update_begin(&rxsc_stats->syncp); 1259 rxsc_stats->stats.InPktsLate++; 1260 u64_stats_update_end(&rxsc_stats->syncp); 1261 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1262 goto drop; 1263 } 1264 } 1265 1266 macsec_skb_cb(skb)->rx_sa = rx_sa; 1267 1268 /* Disabled && !changed text => skip validation */ 1269 if (hdr->tci_an & MACSEC_TCI_C || 1270 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1271 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1272 1273 if (IS_ERR(skb)) { 1274 /* the decrypt callback needs the reference */ 1275 if (PTR_ERR(skb) != -EINPROGRESS) { 1276 macsec_rxsa_put(rx_sa); 1277 macsec_rxsc_put(rx_sc); 1278 } 1279 rcu_read_unlock(); 1280 *pskb = NULL; 1281 return RX_HANDLER_CONSUMED; 1282 } 1283 1284 if (!macsec_post_decrypt(skb, secy, hdr_pn)) 1285 goto drop; 1286 1287 deliver: 1288 macsec_finalize_skb(skb, secy->icv_len, 1289 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1290 len = skb->len; 1291 macsec_reset_skb(skb, secy->netdev); 1292 1293 if (rx_sa) 1294 macsec_rxsa_put(rx_sa); 1295 macsec_rxsc_put(rx_sc); 1296 1297 skb_orphan(skb); 1298 ret = gro_cells_receive(&macsec->gro_cells, skb); 1299 if (ret == NET_RX_SUCCESS) 1300 count_rx(dev, len); 1301 else 1302 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1303 1304 rcu_read_unlock(); 1305 1306 *pskb = NULL; 1307 return RX_HANDLER_CONSUMED; 1308 1309 drop: 1310 macsec_rxsa_put(rx_sa); 1311 drop_nosa: 1312 macsec_rxsc_put(rx_sc); 1313 drop_nosc: 1314 rcu_read_unlock(); 1315 drop_direct: 1316 kfree_skb(skb); 1317 *pskb = NULL; 1318 return RX_HANDLER_CONSUMED; 1319 1320 nosci: 1321 /* 10.6.1 if the SC is not found */ 1322 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1323 if (!cbit) 1324 macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN, 1325 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1326 1327 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1328 struct sk_buff *nskb; 1329 1330 secy_stats = this_cpu_ptr(macsec->stats); 1331 1332 /* If validateFrames is Strict or the C bit in the 1333 * SecTAG is set, discard 1334 */ 1335 if (cbit || 1336 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1337 u64_stats_update_begin(&secy_stats->syncp); 1338 secy_stats->stats.InPktsNoSCI++; 1339 u64_stats_update_end(&secy_stats->syncp); 1340 DEV_STATS_INC(macsec->secy.netdev, rx_errors); 1341 continue; 1342 } 1343 1344 /* not strict, the frame (with the SecTAG and ICV 1345 * removed) is delivered to the Controlled Port. 1346 */ 1347 nskb = skb_clone(skb, GFP_ATOMIC); 1348 if (!nskb) 1349 break; 1350 1351 macsec_reset_skb(nskb, macsec->secy.netdev); 1352 1353 ret = __netif_rx(nskb); 1354 if (ret == NET_RX_SUCCESS) { 1355 u64_stats_update_begin(&secy_stats->syncp); 1356 secy_stats->stats.InPktsUnknownSCI++; 1357 u64_stats_update_end(&secy_stats->syncp); 1358 } else { 1359 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1360 } 1361 } 1362 1363 rcu_read_unlock(); 1364 *pskb = skb; 1365 return RX_HANDLER_PASS; 1366 } 1367 1368 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1369 { 1370 struct crypto_aead *tfm; 1371 int ret; 1372 1373 tfm = crypto_alloc_aead("gcm(aes)", 0, 0); 1374 1375 if (IS_ERR(tfm)) 1376 return tfm; 1377 1378 ret = crypto_aead_setkey(tfm, key, key_len); 1379 if (ret < 0) 1380 goto fail; 1381 1382 ret = crypto_aead_setauthsize(tfm, icv_len); 1383 if (ret < 0) 1384 goto fail; 1385 1386 return tfm; 1387 fail: 1388 crypto_free_aead(tfm); 1389 return ERR_PTR(ret); 1390 } 1391 1392 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1393 int icv_len) 1394 { 1395 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1396 if (!rx_sa->stats) 1397 return -ENOMEM; 1398 1399 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1400 if (IS_ERR(rx_sa->key.tfm)) { 1401 free_percpu(rx_sa->stats); 1402 return PTR_ERR(rx_sa->key.tfm); 1403 } 1404 1405 rx_sa->ssci = MACSEC_UNDEF_SSCI; 1406 rx_sa->active = false; 1407 rx_sa->next_pn = 1; 1408 refcount_set(&rx_sa->refcnt, 1); 1409 spin_lock_init(&rx_sa->lock); 1410 1411 return 0; 1412 } 1413 1414 static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1415 { 1416 rx_sa->active = false; 1417 1418 macsec_rxsa_put(rx_sa); 1419 } 1420 1421 static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1422 { 1423 int i; 1424 1425 for (i = 0; i < MACSEC_NUM_AN; i++) { 1426 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1427 1428 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1429 if (sa) 1430 clear_rx_sa(sa); 1431 } 1432 1433 macsec_rxsc_put(rx_sc); 1434 } 1435 1436 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1437 { 1438 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1439 1440 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1441 rx_sc; 1442 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1443 if (rx_sc->sci == sci) { 1444 if (rx_sc->active) 1445 secy->n_rx_sc--; 1446 rcu_assign_pointer(*rx_scp, rx_sc->next); 1447 return rx_sc; 1448 } 1449 } 1450 1451 return NULL; 1452 } 1453 1454 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci, 1455 bool active) 1456 { 1457 struct macsec_rx_sc *rx_sc; 1458 struct macsec_dev *macsec; 1459 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1460 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1461 struct macsec_secy *secy; 1462 1463 list_for_each_entry(macsec, &rxd->secys, secys) { 1464 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1465 return ERR_PTR(-EEXIST); 1466 } 1467 1468 rx_sc = kzalloc_obj(*rx_sc); 1469 if (!rx_sc) 1470 return ERR_PTR(-ENOMEM); 1471 1472 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1473 if (!rx_sc->stats) { 1474 kfree(rx_sc); 1475 return ERR_PTR(-ENOMEM); 1476 } 1477 1478 rx_sc->sci = sci; 1479 rx_sc->active = active; 1480 refcount_set(&rx_sc->refcnt, 1); 1481 1482 secy = &macsec_priv(dev)->secy; 1483 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1484 rcu_assign_pointer(secy->rx_sc, rx_sc); 1485 1486 if (rx_sc->active) 1487 secy->n_rx_sc++; 1488 1489 return rx_sc; 1490 } 1491 1492 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1493 int icv_len) 1494 { 1495 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1496 if (!tx_sa->stats) 1497 return -ENOMEM; 1498 1499 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1500 if (IS_ERR(tx_sa->key.tfm)) { 1501 free_percpu(tx_sa->stats); 1502 return PTR_ERR(tx_sa->key.tfm); 1503 } 1504 1505 tx_sa->ssci = MACSEC_UNDEF_SSCI; 1506 tx_sa->active = false; 1507 refcount_set(&tx_sa->refcnt, 1); 1508 spin_lock_init(&tx_sa->lock); 1509 1510 return 0; 1511 } 1512 1513 static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1514 { 1515 tx_sa->active = false; 1516 1517 macsec_txsa_put(tx_sa); 1518 } 1519 1520 static struct genl_family macsec_fam; 1521 1522 static struct net_device *get_dev_from_nl(struct net *net, 1523 struct nlattr **attrs) 1524 { 1525 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1526 struct net_device *dev; 1527 1528 dev = __dev_get_by_index(net, ifindex); 1529 if (!dev) 1530 return ERR_PTR(-ENODEV); 1531 1532 if (!netif_is_macsec(dev)) 1533 return ERR_PTR(-ENODEV); 1534 1535 return dev; 1536 } 1537 1538 static enum macsec_offload nla_get_offload(const struct nlattr *nla) 1539 { 1540 return (__force enum macsec_offload)nla_get_u8(nla); 1541 } 1542 1543 static sci_t nla_get_sci(const struct nlattr *nla) 1544 { 1545 return (__force sci_t)nla_get_u64(nla); 1546 } 1547 1548 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, 1549 int padattr) 1550 { 1551 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); 1552 } 1553 1554 static ssci_t nla_get_ssci(const struct nlattr *nla) 1555 { 1556 return (__force ssci_t)nla_get_u32(nla); 1557 } 1558 1559 static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value) 1560 { 1561 return nla_put_u32(skb, attrtype, (__force u64)value); 1562 } 1563 1564 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1565 struct nlattr **attrs, 1566 struct nlattr **tb_sa, 1567 struct net_device **devp, 1568 struct macsec_secy **secyp, 1569 struct macsec_tx_sc **scp, 1570 u8 *assoc_num) 1571 { 1572 struct net_device *dev; 1573 struct macsec_secy *secy; 1574 struct macsec_tx_sc *tx_sc; 1575 struct macsec_tx_sa *tx_sa; 1576 1577 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1578 return ERR_PTR(-EINVAL); 1579 1580 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1581 1582 dev = get_dev_from_nl(net, attrs); 1583 if (IS_ERR(dev)) 1584 return ERR_CAST(dev); 1585 1586 secy = &macsec_priv(dev)->secy; 1587 tx_sc = &secy->tx_sc; 1588 1589 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1590 if (!tx_sa) 1591 return ERR_PTR(-ENODEV); 1592 1593 *devp = dev; 1594 *scp = tx_sc; 1595 *secyp = secy; 1596 return tx_sa; 1597 } 1598 1599 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1600 struct nlattr **attrs, 1601 struct nlattr **tb_rxsc, 1602 struct net_device **devp, 1603 struct macsec_secy **secyp) 1604 { 1605 struct net_device *dev; 1606 struct macsec_secy *secy; 1607 struct macsec_rx_sc *rx_sc; 1608 sci_t sci; 1609 1610 dev = get_dev_from_nl(net, attrs); 1611 if (IS_ERR(dev)) 1612 return ERR_CAST(dev); 1613 1614 secy = &macsec_priv(dev)->secy; 1615 1616 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1617 return ERR_PTR(-EINVAL); 1618 1619 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1620 rx_sc = find_rx_sc_rtnl(secy, sci); 1621 if (!rx_sc) 1622 return ERR_PTR(-ENODEV); 1623 1624 *secyp = secy; 1625 *devp = dev; 1626 1627 return rx_sc; 1628 } 1629 1630 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1631 struct nlattr **attrs, 1632 struct nlattr **tb_rxsc, 1633 struct nlattr **tb_sa, 1634 struct net_device **devp, 1635 struct macsec_secy **secyp, 1636 struct macsec_rx_sc **scp, 1637 u8 *assoc_num) 1638 { 1639 struct macsec_rx_sc *rx_sc; 1640 struct macsec_rx_sa *rx_sa; 1641 1642 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1643 return ERR_PTR(-EINVAL); 1644 1645 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1646 1647 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1648 if (IS_ERR(rx_sc)) 1649 return ERR_CAST(rx_sc); 1650 1651 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1652 if (!rx_sa) 1653 return ERR_PTR(-ENODEV); 1654 1655 *scp = rx_sc; 1656 return rx_sa; 1657 } 1658 1659 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1660 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1661 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1662 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1663 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED }, 1664 }; 1665 1666 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1667 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1668 [MACSEC_RXSC_ATTR_ACTIVE] = NLA_POLICY_MAX(NLA_U8, 1), 1669 }; 1670 1671 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1672 [MACSEC_SA_ATTR_AN] = NLA_POLICY_MAX(NLA_U8, MACSEC_NUM_AN - 1), 1673 [MACSEC_SA_ATTR_ACTIVE] = NLA_POLICY_MAX(NLA_U8, 1), 1674 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN(NLA_UINT, 1), 1675 [MACSEC_SA_ATTR_KEYID] = NLA_POLICY_EXACT_LEN(MACSEC_KEYID_LEN), 1676 [MACSEC_SA_ATTR_KEY] = NLA_POLICY_MAX_LEN(MACSEC_MAX_KEY_LEN), 1677 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 }, 1678 [MACSEC_SA_ATTR_SALT] = NLA_POLICY_EXACT_LEN(MACSEC_SALT_LEN), 1679 }; 1680 1681 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = { 1682 [MACSEC_OFFLOAD_ATTR_TYPE] = NLA_POLICY_MAX(NLA_U8, MACSEC_OFFLOAD_MAX), 1683 }; 1684 1685 /* Offloads an operation to a device driver */ 1686 static int macsec_offload(int (* const func)(struct macsec_context *), 1687 struct macsec_context *ctx) 1688 { 1689 int ret; 1690 1691 if (unlikely(!func)) 1692 return 0; 1693 1694 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1695 mutex_lock(&ctx->phydev->lock); 1696 1697 ret = (*func)(ctx); 1698 1699 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1700 mutex_unlock(&ctx->phydev->lock); 1701 1702 return ret; 1703 } 1704 1705 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1706 { 1707 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1708 return -EINVAL; 1709 1710 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL)) 1711 return -EINVAL; 1712 1713 return 0; 1714 } 1715 1716 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1717 { 1718 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1719 return -EINVAL; 1720 1721 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL)) 1722 return -EINVAL; 1723 1724 return 0; 1725 } 1726 1727 static bool validate_add_rxsa(struct nlattr **attrs) 1728 { 1729 if (!attrs[MACSEC_SA_ATTR_AN] || 1730 !attrs[MACSEC_SA_ATTR_KEY] || 1731 !attrs[MACSEC_SA_ATTR_KEYID]) 1732 return false; 1733 1734 return true; 1735 } 1736 1737 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1738 { 1739 struct net_device *dev; 1740 struct nlattr **attrs = info->attrs; 1741 struct macsec_secy *secy; 1742 struct macsec_rx_sc *rx_sc; 1743 struct macsec_rx_sa *rx_sa; 1744 unsigned char assoc_num; 1745 int pn_len; 1746 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1747 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1748 int err; 1749 1750 if (!attrs[MACSEC_ATTR_IFINDEX]) 1751 return -EINVAL; 1752 1753 if (parse_sa_config(attrs, tb_sa)) 1754 return -EINVAL; 1755 1756 if (parse_rxsc_config(attrs, tb_rxsc)) 1757 return -EINVAL; 1758 1759 if (!validate_add_rxsa(tb_sa)) 1760 return -EINVAL; 1761 1762 rtnl_lock(); 1763 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1764 if (IS_ERR(rx_sc)) { 1765 rtnl_unlock(); 1766 return PTR_ERR(rx_sc); 1767 } 1768 1769 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1770 1771 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1772 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1773 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1774 rtnl_unlock(); 1775 return -EINVAL; 1776 } 1777 1778 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1779 if (tb_sa[MACSEC_SA_ATTR_PN] && 1780 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1781 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n", 1782 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1783 rtnl_unlock(); 1784 return -EINVAL; 1785 } 1786 1787 if (secy->xpn) { 1788 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 1789 rtnl_unlock(); 1790 return -EINVAL; 1791 } 1792 } 1793 1794 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1795 if (rx_sa) { 1796 rtnl_unlock(); 1797 return -EBUSY; 1798 } 1799 1800 rx_sa = kmalloc_obj(*rx_sa); 1801 if (!rx_sa) { 1802 rtnl_unlock(); 1803 return -ENOMEM; 1804 } 1805 1806 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1807 secy->key_len, secy->icv_len); 1808 if (err < 0) { 1809 kfree(rx_sa); 1810 rtnl_unlock(); 1811 return err; 1812 } 1813 1814 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1815 spin_lock_bh(&rx_sa->lock); 1816 rx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]); 1817 spin_unlock_bh(&rx_sa->lock); 1818 } 1819 1820 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1821 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1822 1823 rx_sa->sc = rx_sc; 1824 1825 if (secy->xpn) { 1826 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 1827 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 1828 MACSEC_SALT_LEN); 1829 } 1830 1831 /* If h/w offloading is available, propagate to the device */ 1832 if (macsec_is_offloaded(netdev_priv(dev))) { 1833 const struct macsec_ops *ops; 1834 struct macsec_context ctx; 1835 1836 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1837 if (!ops) { 1838 err = -EOPNOTSUPP; 1839 goto cleanup; 1840 } 1841 1842 ctx.sa.assoc_num = assoc_num; 1843 ctx.sa.rx_sa = rx_sa; 1844 ctx.secy = secy; 1845 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1846 secy->key_len); 1847 1848 err = macsec_offload(ops->mdo_add_rxsa, &ctx); 1849 memzero_explicit(ctx.sa.key, secy->key_len); 1850 if (err) 1851 goto cleanup; 1852 } 1853 1854 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1855 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1856 1857 rtnl_unlock(); 1858 1859 return 0; 1860 1861 cleanup: 1862 macsec_rxsa_put(rx_sa); 1863 rtnl_unlock(); 1864 return err; 1865 } 1866 1867 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1868 { 1869 struct net_device *dev; 1870 sci_t sci = MACSEC_UNDEF_SCI; 1871 struct nlattr **attrs = info->attrs; 1872 struct macsec_rx_sc *rx_sc; 1873 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1874 struct macsec_secy *secy; 1875 bool active = true; 1876 int ret; 1877 1878 if (!attrs[MACSEC_ATTR_IFINDEX]) 1879 return -EINVAL; 1880 1881 if (parse_rxsc_config(attrs, tb_rxsc)) 1882 return -EINVAL; 1883 1884 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1885 return -EINVAL; 1886 1887 rtnl_lock(); 1888 dev = get_dev_from_nl(genl_info_net(info), attrs); 1889 if (IS_ERR(dev)) { 1890 rtnl_unlock(); 1891 return PTR_ERR(dev); 1892 } 1893 1894 secy = &macsec_priv(dev)->secy; 1895 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1896 1897 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1898 active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1899 1900 rx_sc = create_rx_sc(dev, sci, active); 1901 if (IS_ERR(rx_sc)) { 1902 rtnl_unlock(); 1903 return PTR_ERR(rx_sc); 1904 } 1905 1906 if (macsec_is_offloaded(netdev_priv(dev))) { 1907 const struct macsec_ops *ops; 1908 struct macsec_context ctx; 1909 1910 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1911 if (!ops) { 1912 ret = -EOPNOTSUPP; 1913 goto cleanup; 1914 } 1915 1916 ctx.rx_sc = rx_sc; 1917 ctx.secy = secy; 1918 1919 ret = macsec_offload(ops->mdo_add_rxsc, &ctx); 1920 if (ret) 1921 goto cleanup; 1922 } 1923 1924 rtnl_unlock(); 1925 1926 return 0; 1927 1928 cleanup: 1929 del_rx_sc(secy, sci); 1930 free_rx_sc(rx_sc); 1931 rtnl_unlock(); 1932 return ret; 1933 } 1934 1935 static bool validate_add_txsa(struct nlattr **attrs) 1936 { 1937 if (!attrs[MACSEC_SA_ATTR_AN] || 1938 !attrs[MACSEC_SA_ATTR_PN] || 1939 !attrs[MACSEC_SA_ATTR_KEY] || 1940 !attrs[MACSEC_SA_ATTR_KEYID]) 1941 return false; 1942 1943 return true; 1944 } 1945 1946 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1947 { 1948 struct net_device *dev; 1949 struct nlattr **attrs = info->attrs; 1950 struct macsec_secy *secy; 1951 struct macsec_tx_sc *tx_sc; 1952 struct macsec_tx_sa *tx_sa; 1953 unsigned char assoc_num; 1954 int pn_len; 1955 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1956 bool was_operational; 1957 int err; 1958 1959 if (!attrs[MACSEC_ATTR_IFINDEX]) 1960 return -EINVAL; 1961 1962 if (parse_sa_config(attrs, tb_sa)) 1963 return -EINVAL; 1964 1965 if (!validate_add_txsa(tb_sa)) 1966 return -EINVAL; 1967 1968 rtnl_lock(); 1969 dev = get_dev_from_nl(genl_info_net(info), attrs); 1970 if (IS_ERR(dev)) { 1971 rtnl_unlock(); 1972 return PTR_ERR(dev); 1973 } 1974 1975 secy = &macsec_priv(dev)->secy; 1976 tx_sc = &secy->tx_sc; 1977 1978 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1979 1980 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1981 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 1982 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1983 rtnl_unlock(); 1984 return -EINVAL; 1985 } 1986 1987 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1988 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1989 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n", 1990 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1991 rtnl_unlock(); 1992 return -EINVAL; 1993 } 1994 1995 if (secy->xpn) { 1996 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 1997 rtnl_unlock(); 1998 return -EINVAL; 1999 } 2000 } 2001 2002 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 2003 if (tx_sa) { 2004 rtnl_unlock(); 2005 return -EBUSY; 2006 } 2007 2008 tx_sa = kmalloc_obj(*tx_sa); 2009 if (!tx_sa) { 2010 rtnl_unlock(); 2011 return -ENOMEM; 2012 } 2013 2014 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2015 secy->key_len, secy->icv_len); 2016 if (err < 0) { 2017 kfree(tx_sa); 2018 rtnl_unlock(); 2019 return err; 2020 } 2021 2022 spin_lock_bh(&tx_sa->lock); 2023 tx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]); 2024 spin_unlock_bh(&tx_sa->lock); 2025 2026 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2027 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2028 2029 was_operational = secy->operational; 2030 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 2031 secy->operational = true; 2032 2033 if (secy->xpn) { 2034 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 2035 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 2036 MACSEC_SALT_LEN); 2037 } 2038 2039 /* If h/w offloading is available, propagate to the device */ 2040 if (macsec_is_offloaded(netdev_priv(dev))) { 2041 const struct macsec_ops *ops; 2042 struct macsec_context ctx; 2043 2044 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2045 if (!ops) { 2046 err = -EOPNOTSUPP; 2047 goto cleanup; 2048 } 2049 2050 ctx.sa.assoc_num = assoc_num; 2051 ctx.sa.tx_sa = tx_sa; 2052 ctx.secy = secy; 2053 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2054 secy->key_len); 2055 2056 err = macsec_offload(ops->mdo_add_txsa, &ctx); 2057 memzero_explicit(ctx.sa.key, secy->key_len); 2058 if (err) 2059 goto cleanup; 2060 } 2061 2062 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 2063 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 2064 2065 rtnl_unlock(); 2066 2067 return 0; 2068 2069 cleanup: 2070 secy->operational = was_operational; 2071 macsec_txsa_put(tx_sa); 2072 rtnl_unlock(); 2073 return err; 2074 } 2075 2076 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 2077 { 2078 struct nlattr **attrs = info->attrs; 2079 struct net_device *dev; 2080 struct macsec_secy *secy; 2081 struct macsec_rx_sc *rx_sc; 2082 struct macsec_rx_sa *rx_sa; 2083 u8 assoc_num; 2084 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2085 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2086 int ret; 2087 2088 if (!attrs[MACSEC_ATTR_IFINDEX]) 2089 return -EINVAL; 2090 2091 if (parse_sa_config(attrs, tb_sa)) 2092 return -EINVAL; 2093 2094 if (parse_rxsc_config(attrs, tb_rxsc)) 2095 return -EINVAL; 2096 2097 rtnl_lock(); 2098 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2099 &dev, &secy, &rx_sc, &assoc_num); 2100 if (IS_ERR(rx_sa)) { 2101 rtnl_unlock(); 2102 return PTR_ERR(rx_sa); 2103 } 2104 2105 if (rx_sa->active) { 2106 rtnl_unlock(); 2107 return -EBUSY; 2108 } 2109 2110 /* If h/w offloading is available, propagate to the device */ 2111 if (macsec_is_offloaded(netdev_priv(dev))) { 2112 const struct macsec_ops *ops; 2113 struct macsec_context ctx; 2114 2115 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2116 if (!ops) { 2117 ret = -EOPNOTSUPP; 2118 goto cleanup; 2119 } 2120 2121 ctx.sa.assoc_num = assoc_num; 2122 ctx.sa.rx_sa = rx_sa; 2123 ctx.secy = secy; 2124 2125 ret = macsec_offload(ops->mdo_del_rxsa, &ctx); 2126 if (ret) 2127 goto cleanup; 2128 } 2129 2130 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 2131 clear_rx_sa(rx_sa); 2132 2133 rtnl_unlock(); 2134 2135 return 0; 2136 2137 cleanup: 2138 rtnl_unlock(); 2139 return ret; 2140 } 2141 2142 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 2143 { 2144 struct nlattr **attrs = info->attrs; 2145 struct net_device *dev; 2146 struct macsec_secy *secy; 2147 struct macsec_rx_sc *rx_sc; 2148 sci_t sci; 2149 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2150 int ret; 2151 2152 if (!attrs[MACSEC_ATTR_IFINDEX]) 2153 return -EINVAL; 2154 2155 if (parse_rxsc_config(attrs, tb_rxsc)) 2156 return -EINVAL; 2157 2158 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 2159 return -EINVAL; 2160 2161 rtnl_lock(); 2162 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 2163 if (IS_ERR(dev)) { 2164 rtnl_unlock(); 2165 return PTR_ERR(dev); 2166 } 2167 2168 secy = &macsec_priv(dev)->secy; 2169 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 2170 2171 rx_sc = del_rx_sc(secy, sci); 2172 if (!rx_sc) { 2173 rtnl_unlock(); 2174 return -ENODEV; 2175 } 2176 2177 /* If h/w offloading is available, propagate to the device */ 2178 if (macsec_is_offloaded(netdev_priv(dev))) { 2179 const struct macsec_ops *ops; 2180 struct macsec_context ctx; 2181 2182 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2183 if (!ops) { 2184 ret = -EOPNOTSUPP; 2185 goto cleanup; 2186 } 2187 2188 ctx.rx_sc = rx_sc; 2189 ctx.secy = secy; 2190 ret = macsec_offload(ops->mdo_del_rxsc, &ctx); 2191 if (ret) 2192 goto cleanup; 2193 } 2194 2195 free_rx_sc(rx_sc); 2196 rtnl_unlock(); 2197 2198 return 0; 2199 2200 cleanup: 2201 rtnl_unlock(); 2202 return ret; 2203 } 2204 2205 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 2206 { 2207 struct nlattr **attrs = info->attrs; 2208 struct net_device *dev; 2209 struct macsec_secy *secy; 2210 struct macsec_tx_sc *tx_sc; 2211 struct macsec_tx_sa *tx_sa; 2212 u8 assoc_num; 2213 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2214 int ret; 2215 2216 if (!attrs[MACSEC_ATTR_IFINDEX]) 2217 return -EINVAL; 2218 2219 if (parse_sa_config(attrs, tb_sa)) 2220 return -EINVAL; 2221 2222 rtnl_lock(); 2223 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2224 &dev, &secy, &tx_sc, &assoc_num); 2225 if (IS_ERR(tx_sa)) { 2226 rtnl_unlock(); 2227 return PTR_ERR(tx_sa); 2228 } 2229 2230 if (tx_sa->active) { 2231 rtnl_unlock(); 2232 return -EBUSY; 2233 } 2234 2235 /* If h/w offloading is available, propagate to the device */ 2236 if (macsec_is_offloaded(netdev_priv(dev))) { 2237 const struct macsec_ops *ops; 2238 struct macsec_context ctx; 2239 2240 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2241 if (!ops) { 2242 ret = -EOPNOTSUPP; 2243 goto cleanup; 2244 } 2245 2246 ctx.sa.assoc_num = assoc_num; 2247 ctx.sa.tx_sa = tx_sa; 2248 ctx.secy = secy; 2249 2250 ret = macsec_offload(ops->mdo_del_txsa, &ctx); 2251 if (ret) 2252 goto cleanup; 2253 } 2254 2255 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 2256 clear_tx_sa(tx_sa); 2257 2258 rtnl_unlock(); 2259 2260 return 0; 2261 2262 cleanup: 2263 rtnl_unlock(); 2264 return ret; 2265 } 2266 2267 static bool validate_upd_sa(struct nlattr **attrs) 2268 { 2269 if (!attrs[MACSEC_SA_ATTR_AN] || 2270 attrs[MACSEC_SA_ATTR_KEY] || 2271 attrs[MACSEC_SA_ATTR_KEYID] || 2272 attrs[MACSEC_SA_ATTR_SSCI] || 2273 attrs[MACSEC_SA_ATTR_SALT]) 2274 return false; 2275 2276 return true; 2277 } 2278 2279 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2280 { 2281 struct nlattr **attrs = info->attrs; 2282 struct net_device *dev; 2283 struct macsec_secy *secy; 2284 struct macsec_tx_sc *tx_sc; 2285 struct macsec_tx_sa *tx_sa; 2286 u8 assoc_num; 2287 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2288 bool was_operational, was_active; 2289 pn_t prev_pn; 2290 int ret = 0; 2291 2292 prev_pn.full64 = 0; 2293 2294 if (!attrs[MACSEC_ATTR_IFINDEX]) 2295 return -EINVAL; 2296 2297 if (parse_sa_config(attrs, tb_sa)) 2298 return -EINVAL; 2299 2300 if (!validate_upd_sa(tb_sa)) 2301 return -EINVAL; 2302 2303 rtnl_lock(); 2304 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2305 &dev, &secy, &tx_sc, &assoc_num); 2306 if (IS_ERR(tx_sa)) { 2307 rtnl_unlock(); 2308 return PTR_ERR(tx_sa); 2309 } 2310 2311 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2312 int pn_len; 2313 2314 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2315 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2316 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n", 2317 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2318 rtnl_unlock(); 2319 return -EINVAL; 2320 } 2321 2322 spin_lock_bh(&tx_sa->lock); 2323 prev_pn = tx_sa->next_pn_halves; 2324 tx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]); 2325 spin_unlock_bh(&tx_sa->lock); 2326 } 2327 2328 was_active = tx_sa->active; 2329 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2330 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2331 2332 was_operational = secy->operational; 2333 if (assoc_num == tx_sc->encoding_sa) 2334 secy->operational = tx_sa->active; 2335 2336 /* If h/w offloading is available, propagate to the device */ 2337 if (macsec_is_offloaded(netdev_priv(dev))) { 2338 const struct macsec_ops *ops; 2339 struct macsec_context ctx; 2340 2341 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2342 if (!ops) { 2343 ret = -EOPNOTSUPP; 2344 goto cleanup; 2345 } 2346 2347 ctx.sa.assoc_num = assoc_num; 2348 ctx.sa.tx_sa = tx_sa; 2349 ctx.sa.update_pn = !!prev_pn.full64; 2350 ctx.secy = secy; 2351 2352 ret = macsec_offload(ops->mdo_upd_txsa, &ctx); 2353 if (ret) 2354 goto cleanup; 2355 } 2356 2357 rtnl_unlock(); 2358 2359 return 0; 2360 2361 cleanup: 2362 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2363 spin_lock_bh(&tx_sa->lock); 2364 tx_sa->next_pn_halves = prev_pn; 2365 spin_unlock_bh(&tx_sa->lock); 2366 } 2367 tx_sa->active = was_active; 2368 secy->operational = was_operational; 2369 rtnl_unlock(); 2370 return ret; 2371 } 2372 2373 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2374 { 2375 struct nlattr **attrs = info->attrs; 2376 struct net_device *dev; 2377 struct macsec_secy *secy; 2378 struct macsec_rx_sc *rx_sc; 2379 struct macsec_rx_sa *rx_sa; 2380 u8 assoc_num; 2381 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2382 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2383 bool was_active; 2384 pn_t prev_pn; 2385 int ret = 0; 2386 2387 prev_pn.full64 = 0; 2388 2389 if (!attrs[MACSEC_ATTR_IFINDEX]) 2390 return -EINVAL; 2391 2392 if (parse_rxsc_config(attrs, tb_rxsc)) 2393 return -EINVAL; 2394 2395 if (parse_sa_config(attrs, tb_sa)) 2396 return -EINVAL; 2397 2398 if (!validate_upd_sa(tb_sa)) 2399 return -EINVAL; 2400 2401 rtnl_lock(); 2402 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2403 &dev, &secy, &rx_sc, &assoc_num); 2404 if (IS_ERR(rx_sa)) { 2405 rtnl_unlock(); 2406 return PTR_ERR(rx_sa); 2407 } 2408 2409 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2410 int pn_len; 2411 2412 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2413 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2414 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n", 2415 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2416 rtnl_unlock(); 2417 return -EINVAL; 2418 } 2419 2420 spin_lock_bh(&rx_sa->lock); 2421 prev_pn = rx_sa->next_pn_halves; 2422 rx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]); 2423 spin_unlock_bh(&rx_sa->lock); 2424 } 2425 2426 was_active = rx_sa->active; 2427 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2428 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2429 2430 /* If h/w offloading is available, propagate to the device */ 2431 if (macsec_is_offloaded(netdev_priv(dev))) { 2432 const struct macsec_ops *ops; 2433 struct macsec_context ctx; 2434 2435 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2436 if (!ops) { 2437 ret = -EOPNOTSUPP; 2438 goto cleanup; 2439 } 2440 2441 ctx.sa.assoc_num = assoc_num; 2442 ctx.sa.rx_sa = rx_sa; 2443 ctx.sa.update_pn = !!prev_pn.full64; 2444 ctx.secy = secy; 2445 2446 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx); 2447 if (ret) 2448 goto cleanup; 2449 } 2450 2451 rtnl_unlock(); 2452 return 0; 2453 2454 cleanup: 2455 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2456 spin_lock_bh(&rx_sa->lock); 2457 rx_sa->next_pn_halves = prev_pn; 2458 spin_unlock_bh(&rx_sa->lock); 2459 } 2460 rx_sa->active = was_active; 2461 rtnl_unlock(); 2462 return ret; 2463 } 2464 2465 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2466 { 2467 struct nlattr **attrs = info->attrs; 2468 struct net_device *dev; 2469 struct macsec_secy *secy; 2470 struct macsec_rx_sc *rx_sc; 2471 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2472 unsigned int prev_n_rx_sc; 2473 bool was_active; 2474 int ret; 2475 2476 if (!attrs[MACSEC_ATTR_IFINDEX]) 2477 return -EINVAL; 2478 2479 if (parse_rxsc_config(attrs, tb_rxsc)) 2480 return -EINVAL; 2481 2482 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 2483 return -EINVAL; 2484 2485 rtnl_lock(); 2486 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2487 if (IS_ERR(rx_sc)) { 2488 rtnl_unlock(); 2489 return PTR_ERR(rx_sc); 2490 } 2491 2492 was_active = rx_sc->active; 2493 prev_n_rx_sc = secy->n_rx_sc; 2494 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2495 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2496 2497 if (rx_sc->active != new) 2498 secy->n_rx_sc += new ? 1 : -1; 2499 2500 rx_sc->active = new; 2501 } 2502 2503 /* If h/w offloading is available, propagate to the device */ 2504 if (macsec_is_offloaded(netdev_priv(dev))) { 2505 const struct macsec_ops *ops; 2506 struct macsec_context ctx; 2507 2508 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2509 if (!ops) { 2510 ret = -EOPNOTSUPP; 2511 goto cleanup; 2512 } 2513 2514 ctx.rx_sc = rx_sc; 2515 ctx.secy = secy; 2516 2517 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx); 2518 if (ret) 2519 goto cleanup; 2520 } 2521 2522 rtnl_unlock(); 2523 2524 return 0; 2525 2526 cleanup: 2527 secy->n_rx_sc = prev_n_rx_sc; 2528 rx_sc->active = was_active; 2529 rtnl_unlock(); 2530 return ret; 2531 } 2532 2533 static bool macsec_is_configured(struct macsec_dev *macsec) 2534 { 2535 struct macsec_secy *secy = &macsec->secy; 2536 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2537 int i; 2538 2539 if (secy->rx_sc) 2540 return true; 2541 2542 for (i = 0; i < MACSEC_NUM_AN; i++) 2543 if (tx_sc->sa[i]) 2544 return true; 2545 2546 return false; 2547 } 2548 2549 static bool macsec_needs_tx_tag(struct macsec_dev *macsec, 2550 const struct macsec_ops *ops) 2551 { 2552 return macsec->offload == MACSEC_OFFLOAD_PHY && 2553 ops->mdo_insert_tx_tag; 2554 } 2555 2556 static void macsec_set_head_tail_room(struct net_device *dev) 2557 { 2558 struct macsec_dev *macsec = macsec_priv(dev); 2559 struct net_device *real_dev = macsec->real_dev; 2560 int needed_headroom, needed_tailroom; 2561 const struct macsec_ops *ops; 2562 2563 ops = macsec_get_ops(macsec, NULL); 2564 if (ops) { 2565 needed_headroom = ops->needed_headroom; 2566 needed_tailroom = ops->needed_tailroom; 2567 } else { 2568 needed_headroom = MACSEC_NEEDED_HEADROOM; 2569 needed_tailroom = MACSEC_NEEDED_TAILROOM; 2570 } 2571 2572 dev->needed_headroom = real_dev->needed_headroom + needed_headroom; 2573 dev->needed_tailroom = real_dev->needed_tailroom + needed_tailroom; 2574 } 2575 2576 static void macsec_inherit_tso_max(struct net_device *dev) 2577 { 2578 struct macsec_dev *macsec = macsec_priv(dev); 2579 2580 /* if macsec is offloaded, we need to follow the lower 2581 * device's capabilities. otherwise, we can ignore them. 2582 */ 2583 if (macsec_is_offloaded(macsec)) 2584 netif_inherit_tso_max(dev, macsec->real_dev); 2585 } 2586 2587 static int macsec_update_offload(struct net_device *dev, 2588 enum macsec_offload offload, 2589 struct netlink_ext_ack *extack) 2590 { 2591 enum macsec_offload prev_offload; 2592 const struct macsec_ops *ops; 2593 struct macsec_context ctx; 2594 struct macsec_dev *macsec; 2595 int ret = 0; 2596 2597 macsec = macsec_priv(dev); 2598 2599 /* Check if the offloading mode is supported by the underlying layers */ 2600 if (offload != MACSEC_OFFLOAD_OFF && 2601 !macsec_check_offload(offload, macsec)) 2602 return -EOPNOTSUPP; 2603 2604 /* Check if the net device is busy. */ 2605 if (netif_running(dev)) 2606 return -EBUSY; 2607 2608 /* Check if the device already has rules configured: we do not support 2609 * rules migration. 2610 */ 2611 if (macsec_is_configured(macsec)) 2612 return -EBUSY; 2613 2614 prev_offload = macsec->offload; 2615 2616 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload, 2617 macsec, &ctx); 2618 if (!ops) 2619 return -EOPNOTSUPP; 2620 2621 ctx.secy = &macsec->secy; 2622 ret = offload == MACSEC_OFFLOAD_OFF ? macsec_offload(ops->mdo_del_secy, &ctx) 2623 : macsec_offload(ops->mdo_add_secy, &ctx); 2624 if (ret) 2625 return ret; 2626 2627 /* Remove VLAN filters when disabling offload. */ 2628 if (offload == MACSEC_OFFLOAD_OFF) { 2629 vlan_drop_rx_ctag_filter_info(dev); 2630 vlan_drop_rx_stag_filter_info(dev); 2631 } 2632 macsec->offload = offload; 2633 /* Add VLAN filters when enabling offload. */ 2634 if (prev_offload == MACSEC_OFFLOAD_OFF) { 2635 ret = vlan_get_rx_ctag_filter_info(dev); 2636 if (ret) { 2637 NL_SET_ERR_MSG_FMT(extack, 2638 "adding ctag VLAN filters failed, err %d", 2639 ret); 2640 goto rollback_offload; 2641 } 2642 ret = vlan_get_rx_stag_filter_info(dev); 2643 if (ret) { 2644 NL_SET_ERR_MSG_FMT(extack, 2645 "adding stag VLAN filters failed, err %d", 2646 ret); 2647 vlan_drop_rx_ctag_filter_info(dev); 2648 goto rollback_offload; 2649 } 2650 } 2651 2652 macsec_set_head_tail_room(dev); 2653 macsec->insert_tx_tag = macsec_needs_tx_tag(macsec, ops); 2654 2655 macsec_inherit_tso_max(dev); 2656 2657 netdev_update_features(dev); 2658 2659 return 0; 2660 2661 rollback_offload: 2662 macsec->offload = prev_offload; 2663 macsec_offload(ops->mdo_del_secy, &ctx); 2664 2665 return ret; 2666 } 2667 2668 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info) 2669 { 2670 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1]; 2671 struct nlattr **attrs = info->attrs; 2672 enum macsec_offload offload; 2673 struct macsec_dev *macsec; 2674 struct net_device *dev; 2675 int ret = 0; 2676 2677 if (!attrs[MACSEC_ATTR_IFINDEX]) 2678 return -EINVAL; 2679 2680 if (!attrs[MACSEC_ATTR_OFFLOAD]) 2681 return -EINVAL; 2682 2683 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX, 2684 attrs[MACSEC_ATTR_OFFLOAD], 2685 macsec_genl_offload_policy, NULL)) 2686 return -EINVAL; 2687 2688 rtnl_lock(); 2689 2690 dev = get_dev_from_nl(genl_info_net(info), attrs); 2691 if (IS_ERR(dev)) { 2692 ret = PTR_ERR(dev); 2693 goto out; 2694 } 2695 macsec = macsec_priv(dev); 2696 2697 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) { 2698 ret = -EINVAL; 2699 goto out; 2700 } 2701 2702 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]); 2703 2704 if (macsec->offload != offload) 2705 ret = macsec_update_offload(dev, offload, info->extack); 2706 out: 2707 rtnl_unlock(); 2708 return ret; 2709 } 2710 2711 static void get_tx_sa_stats(struct net_device *dev, int an, 2712 struct macsec_tx_sa *tx_sa, 2713 struct macsec_tx_sa_stats *sum) 2714 { 2715 struct macsec_dev *macsec = macsec_priv(dev); 2716 int cpu; 2717 2718 /* If h/w offloading is available, propagate to the device */ 2719 if (macsec_is_offloaded(macsec)) { 2720 const struct macsec_ops *ops; 2721 struct macsec_context ctx; 2722 2723 ops = macsec_get_ops(macsec, &ctx); 2724 if (ops) { 2725 ctx.sa.assoc_num = an; 2726 ctx.sa.tx_sa = tx_sa; 2727 ctx.stats.tx_sa_stats = sum; 2728 ctx.secy = &macsec_priv(dev)->secy; 2729 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx); 2730 } 2731 return; 2732 } 2733 2734 for_each_possible_cpu(cpu) { 2735 const struct macsec_tx_sa_stats *stats = 2736 per_cpu_ptr(tx_sa->stats, cpu); 2737 2738 sum->OutPktsProtected += stats->OutPktsProtected; 2739 sum->OutPktsEncrypted += stats->OutPktsEncrypted; 2740 } 2741 } 2742 2743 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum) 2744 { 2745 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, 2746 sum->OutPktsProtected) || 2747 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2748 sum->OutPktsEncrypted)) 2749 return -EMSGSIZE; 2750 2751 return 0; 2752 } 2753 2754 static void get_rx_sa_stats(struct net_device *dev, 2755 struct macsec_rx_sc *rx_sc, int an, 2756 struct macsec_rx_sa *rx_sa, 2757 struct macsec_rx_sa_stats *sum) 2758 { 2759 struct macsec_dev *macsec = macsec_priv(dev); 2760 int cpu; 2761 2762 /* If h/w offloading is available, propagate to the device */ 2763 if (macsec_is_offloaded(macsec)) { 2764 const struct macsec_ops *ops; 2765 struct macsec_context ctx; 2766 2767 ops = macsec_get_ops(macsec, &ctx); 2768 if (ops) { 2769 ctx.sa.assoc_num = an; 2770 ctx.sa.rx_sa = rx_sa; 2771 ctx.stats.rx_sa_stats = sum; 2772 ctx.secy = &macsec_priv(dev)->secy; 2773 ctx.rx_sc = rx_sc; 2774 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx); 2775 } 2776 return; 2777 } 2778 2779 for_each_possible_cpu(cpu) { 2780 const struct macsec_rx_sa_stats *stats = 2781 per_cpu_ptr(rx_sa->stats, cpu); 2782 2783 sum->InPktsOK += stats->InPktsOK; 2784 sum->InPktsInvalid += stats->InPktsInvalid; 2785 sum->InPktsNotValid += stats->InPktsNotValid; 2786 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA; 2787 sum->InPktsUnusedSA += stats->InPktsUnusedSA; 2788 } 2789 } 2790 2791 static int copy_rx_sa_stats(struct sk_buff *skb, 2792 struct macsec_rx_sa_stats *sum) 2793 { 2794 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) || 2795 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, 2796 sum->InPktsInvalid) || 2797 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, 2798 sum->InPktsNotValid) || 2799 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2800 sum->InPktsNotUsingSA) || 2801 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, 2802 sum->InPktsUnusedSA)) 2803 return -EMSGSIZE; 2804 2805 return 0; 2806 } 2807 2808 static void get_rx_sc_stats(struct net_device *dev, 2809 struct macsec_rx_sc *rx_sc, 2810 struct macsec_rx_sc_stats *sum) 2811 { 2812 struct macsec_dev *macsec = macsec_priv(dev); 2813 int cpu; 2814 2815 /* If h/w offloading is available, propagate to the device */ 2816 if (macsec_is_offloaded(macsec)) { 2817 const struct macsec_ops *ops; 2818 struct macsec_context ctx; 2819 2820 ops = macsec_get_ops(macsec, &ctx); 2821 if (ops) { 2822 ctx.stats.rx_sc_stats = sum; 2823 ctx.secy = &macsec_priv(dev)->secy; 2824 ctx.rx_sc = rx_sc; 2825 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx); 2826 } 2827 return; 2828 } 2829 2830 for_each_possible_cpu(cpu) { 2831 const struct pcpu_rx_sc_stats *stats; 2832 struct macsec_rx_sc_stats tmp; 2833 unsigned int start; 2834 2835 stats = per_cpu_ptr(rx_sc->stats, cpu); 2836 do { 2837 start = u64_stats_fetch_begin(&stats->syncp); 2838 u64_stats_copy(&tmp, &stats->stats, sizeof(tmp)); 2839 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2840 2841 sum->InOctetsValidated += tmp.InOctetsValidated; 2842 sum->InOctetsDecrypted += tmp.InOctetsDecrypted; 2843 sum->InPktsUnchecked += tmp.InPktsUnchecked; 2844 sum->InPktsDelayed += tmp.InPktsDelayed; 2845 sum->InPktsOK += tmp.InPktsOK; 2846 sum->InPktsInvalid += tmp.InPktsInvalid; 2847 sum->InPktsLate += tmp.InPktsLate; 2848 sum->InPktsNotValid += tmp.InPktsNotValid; 2849 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2850 sum->InPktsUnusedSA += tmp.InPktsUnusedSA; 2851 } 2852 } 2853 2854 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum) 2855 { 2856 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2857 sum->InOctetsValidated, 2858 MACSEC_RXSC_STATS_ATTR_PAD) || 2859 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2860 sum->InOctetsDecrypted, 2861 MACSEC_RXSC_STATS_ATTR_PAD) || 2862 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2863 sum->InPktsUnchecked, 2864 MACSEC_RXSC_STATS_ATTR_PAD) || 2865 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2866 sum->InPktsDelayed, 2867 MACSEC_RXSC_STATS_ATTR_PAD) || 2868 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2869 sum->InPktsOK, 2870 MACSEC_RXSC_STATS_ATTR_PAD) || 2871 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2872 sum->InPktsInvalid, 2873 MACSEC_RXSC_STATS_ATTR_PAD) || 2874 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2875 sum->InPktsLate, 2876 MACSEC_RXSC_STATS_ATTR_PAD) || 2877 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2878 sum->InPktsNotValid, 2879 MACSEC_RXSC_STATS_ATTR_PAD) || 2880 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2881 sum->InPktsNotUsingSA, 2882 MACSEC_RXSC_STATS_ATTR_PAD) || 2883 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2884 sum->InPktsUnusedSA, 2885 MACSEC_RXSC_STATS_ATTR_PAD)) 2886 return -EMSGSIZE; 2887 2888 return 0; 2889 } 2890 2891 static void get_tx_sc_stats(struct net_device *dev, 2892 struct macsec_tx_sc_stats *sum) 2893 { 2894 struct macsec_dev *macsec = macsec_priv(dev); 2895 int cpu; 2896 2897 /* If h/w offloading is available, propagate to the device */ 2898 if (macsec_is_offloaded(macsec)) { 2899 const struct macsec_ops *ops; 2900 struct macsec_context ctx; 2901 2902 ops = macsec_get_ops(macsec, &ctx); 2903 if (ops) { 2904 ctx.stats.tx_sc_stats = sum; 2905 ctx.secy = &macsec_priv(dev)->secy; 2906 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx); 2907 } 2908 return; 2909 } 2910 2911 for_each_possible_cpu(cpu) { 2912 const struct pcpu_tx_sc_stats *stats; 2913 struct macsec_tx_sc_stats tmp; 2914 unsigned int start; 2915 2916 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu); 2917 do { 2918 start = u64_stats_fetch_begin(&stats->syncp); 2919 u64_stats_copy(&tmp, &stats->stats, sizeof(tmp)); 2920 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2921 2922 sum->OutPktsProtected += tmp.OutPktsProtected; 2923 sum->OutPktsEncrypted += tmp.OutPktsEncrypted; 2924 sum->OutOctetsProtected += tmp.OutOctetsProtected; 2925 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2926 } 2927 } 2928 2929 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum) 2930 { 2931 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2932 sum->OutPktsProtected, 2933 MACSEC_TXSC_STATS_ATTR_PAD) || 2934 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2935 sum->OutPktsEncrypted, 2936 MACSEC_TXSC_STATS_ATTR_PAD) || 2937 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2938 sum->OutOctetsProtected, 2939 MACSEC_TXSC_STATS_ATTR_PAD) || 2940 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2941 sum->OutOctetsEncrypted, 2942 MACSEC_TXSC_STATS_ATTR_PAD)) 2943 return -EMSGSIZE; 2944 2945 return 0; 2946 } 2947 2948 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum) 2949 { 2950 struct macsec_dev *macsec = macsec_priv(dev); 2951 int cpu; 2952 2953 /* If h/w offloading is available, propagate to the device */ 2954 if (macsec_is_offloaded(macsec)) { 2955 const struct macsec_ops *ops; 2956 struct macsec_context ctx; 2957 2958 ops = macsec_get_ops(macsec, &ctx); 2959 if (ops) { 2960 ctx.stats.dev_stats = sum; 2961 ctx.secy = &macsec_priv(dev)->secy; 2962 macsec_offload(ops->mdo_get_dev_stats, &ctx); 2963 } 2964 return; 2965 } 2966 2967 for_each_possible_cpu(cpu) { 2968 const struct pcpu_secy_stats *stats; 2969 struct macsec_dev_stats tmp; 2970 unsigned int start; 2971 2972 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu); 2973 do { 2974 start = u64_stats_fetch_begin(&stats->syncp); 2975 u64_stats_copy(&tmp, &stats->stats, sizeof(tmp)); 2976 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2977 2978 sum->OutPktsUntagged += tmp.OutPktsUntagged; 2979 sum->InPktsUntagged += tmp.InPktsUntagged; 2980 sum->OutPktsTooLong += tmp.OutPktsTooLong; 2981 sum->InPktsNoTag += tmp.InPktsNoTag; 2982 sum->InPktsBadTag += tmp.InPktsBadTag; 2983 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2984 sum->InPktsNoSCI += tmp.InPktsNoSCI; 2985 sum->InPktsOverrun += tmp.InPktsOverrun; 2986 } 2987 } 2988 2989 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum) 2990 { 2991 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 2992 sum->OutPktsUntagged, 2993 MACSEC_SECY_STATS_ATTR_PAD) || 2994 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 2995 sum->InPktsUntagged, 2996 MACSEC_SECY_STATS_ATTR_PAD) || 2997 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 2998 sum->OutPktsTooLong, 2999 MACSEC_SECY_STATS_ATTR_PAD) || 3000 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 3001 sum->InPktsNoTag, 3002 MACSEC_SECY_STATS_ATTR_PAD) || 3003 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 3004 sum->InPktsBadTag, 3005 MACSEC_SECY_STATS_ATTR_PAD) || 3006 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 3007 sum->InPktsUnknownSCI, 3008 MACSEC_SECY_STATS_ATTR_PAD) || 3009 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 3010 sum->InPktsNoSCI, 3011 MACSEC_SECY_STATS_ATTR_PAD) || 3012 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 3013 sum->InPktsOverrun, 3014 MACSEC_SECY_STATS_ATTR_PAD)) 3015 return -EMSGSIZE; 3016 3017 return 0; 3018 } 3019 3020 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 3021 { 3022 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3023 struct nlattr *secy_nest = nla_nest_start_noflag(skb, 3024 MACSEC_ATTR_SECY); 3025 u64 csid; 3026 3027 if (!secy_nest) 3028 return 1; 3029 3030 switch (secy->key_len) { 3031 case MACSEC_GCM_AES_128_SAK_LEN: 3032 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 3033 break; 3034 case MACSEC_GCM_AES_256_SAK_LEN: 3035 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 3036 break; 3037 default: 3038 goto cancel; 3039 } 3040 3041 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 3042 MACSEC_SECY_ATTR_PAD) || 3043 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 3044 csid, MACSEC_SECY_ATTR_PAD) || 3045 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 3046 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 3047 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 3048 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 3049 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 3050 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 3051 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 3052 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 3053 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 3054 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 3055 goto cancel; 3056 3057 if (secy->replay_protect) { 3058 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 3059 goto cancel; 3060 } 3061 3062 nla_nest_end(skb, secy_nest); 3063 return 0; 3064 3065 cancel: 3066 nla_nest_cancel(skb, secy_nest); 3067 return 1; 3068 } 3069 3070 static noinline_for_stack int 3071 dump_secy(struct macsec_secy *secy, struct net_device *dev, 3072 struct sk_buff *skb, struct netlink_callback *cb) 3073 { 3074 struct macsec_tx_sc_stats tx_sc_stats = {0, }; 3075 struct macsec_tx_sa_stats tx_sa_stats = {0, }; 3076 struct macsec_rx_sc_stats rx_sc_stats = {0, }; 3077 struct macsec_rx_sa_stats rx_sa_stats = {0, }; 3078 struct macsec_dev *macsec = netdev_priv(dev); 3079 struct macsec_dev_stats dev_stats = {0, }; 3080 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3081 struct nlattr *txsa_list, *rxsc_list; 3082 struct macsec_rx_sc *rx_sc; 3083 struct nlattr *attr; 3084 void *hdr; 3085 int i, j; 3086 3087 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3088 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 3089 if (!hdr) 3090 return -EMSGSIZE; 3091 3092 genl_dump_check_consistent(cb, hdr); 3093 3094 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 3095 goto nla_put_failure; 3096 3097 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD); 3098 if (!attr) 3099 goto nla_put_failure; 3100 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload)) 3101 goto nla_put_failure; 3102 nla_nest_end(skb, attr); 3103 3104 if (nla_put_secy(secy, skb)) 3105 goto nla_put_failure; 3106 3107 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS); 3108 if (!attr) 3109 goto nla_put_failure; 3110 3111 get_tx_sc_stats(dev, &tx_sc_stats); 3112 if (copy_tx_sc_stats(skb, &tx_sc_stats)) { 3113 nla_nest_cancel(skb, attr); 3114 goto nla_put_failure; 3115 } 3116 nla_nest_end(skb, attr); 3117 3118 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS); 3119 if (!attr) 3120 goto nla_put_failure; 3121 get_secy_stats(dev, &dev_stats); 3122 if (copy_secy_stats(skb, &dev_stats)) { 3123 nla_nest_cancel(skb, attr); 3124 goto nla_put_failure; 3125 } 3126 nla_nest_end(skb, attr); 3127 3128 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST); 3129 if (!txsa_list) 3130 goto nla_put_failure; 3131 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 3132 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 3133 struct nlattr *txsa_nest; 3134 u64 pn; 3135 int pn_len; 3136 3137 if (!tx_sa) 3138 continue; 3139 3140 txsa_nest = nla_nest_start_noflag(skb, j++); 3141 if (!txsa_nest) { 3142 nla_nest_cancel(skb, txsa_list); 3143 goto nla_put_failure; 3144 } 3145 3146 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS); 3147 if (!attr) { 3148 nla_nest_cancel(skb, txsa_nest); 3149 nla_nest_cancel(skb, txsa_list); 3150 goto nla_put_failure; 3151 } 3152 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats)); 3153 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats); 3154 if (copy_tx_sa_stats(skb, &tx_sa_stats)) { 3155 nla_nest_cancel(skb, attr); 3156 nla_nest_cancel(skb, txsa_nest); 3157 nla_nest_cancel(skb, txsa_list); 3158 goto nla_put_failure; 3159 } 3160 nla_nest_end(skb, attr); 3161 3162 if (secy->xpn) { 3163 pn = tx_sa->next_pn; 3164 pn_len = MACSEC_XPN_PN_LEN; 3165 } else { 3166 pn = tx_sa->next_pn_halves.lower; 3167 pn_len = MACSEC_DEFAULT_PN_LEN; 3168 } 3169 3170 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3171 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3172 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 3173 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) || 3174 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 3175 nla_nest_cancel(skb, txsa_nest); 3176 nla_nest_cancel(skb, txsa_list); 3177 goto nla_put_failure; 3178 } 3179 3180 nla_nest_end(skb, txsa_nest); 3181 } 3182 nla_nest_end(skb, txsa_list); 3183 3184 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST); 3185 if (!rxsc_list) 3186 goto nla_put_failure; 3187 3188 j = 1; 3189 for_each_rxsc_rtnl(secy, rx_sc) { 3190 int k; 3191 struct nlattr *rxsa_list; 3192 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++); 3193 3194 if (!rxsc_nest) { 3195 nla_nest_cancel(skb, rxsc_list); 3196 goto nla_put_failure; 3197 } 3198 3199 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 3200 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 3201 MACSEC_RXSC_ATTR_PAD)) { 3202 nla_nest_cancel(skb, rxsc_nest); 3203 nla_nest_cancel(skb, rxsc_list); 3204 goto nla_put_failure; 3205 } 3206 3207 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS); 3208 if (!attr) { 3209 nla_nest_cancel(skb, rxsc_nest); 3210 nla_nest_cancel(skb, rxsc_list); 3211 goto nla_put_failure; 3212 } 3213 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats)); 3214 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats); 3215 if (copy_rx_sc_stats(skb, &rx_sc_stats)) { 3216 nla_nest_cancel(skb, attr); 3217 nla_nest_cancel(skb, rxsc_nest); 3218 nla_nest_cancel(skb, rxsc_list); 3219 goto nla_put_failure; 3220 } 3221 nla_nest_end(skb, attr); 3222 3223 rxsa_list = nla_nest_start_noflag(skb, 3224 MACSEC_RXSC_ATTR_SA_LIST); 3225 if (!rxsa_list) { 3226 nla_nest_cancel(skb, rxsc_nest); 3227 nla_nest_cancel(skb, rxsc_list); 3228 goto nla_put_failure; 3229 } 3230 3231 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 3232 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 3233 struct nlattr *rxsa_nest; 3234 u64 pn; 3235 int pn_len; 3236 3237 if (!rx_sa) 3238 continue; 3239 3240 rxsa_nest = nla_nest_start_noflag(skb, k++); 3241 if (!rxsa_nest) { 3242 nla_nest_cancel(skb, rxsa_list); 3243 nla_nest_cancel(skb, rxsc_nest); 3244 nla_nest_cancel(skb, rxsc_list); 3245 goto nla_put_failure; 3246 } 3247 3248 attr = nla_nest_start_noflag(skb, 3249 MACSEC_SA_ATTR_STATS); 3250 if (!attr) { 3251 nla_nest_cancel(skb, rxsa_list); 3252 nla_nest_cancel(skb, rxsc_nest); 3253 nla_nest_cancel(skb, rxsc_list); 3254 goto nla_put_failure; 3255 } 3256 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats)); 3257 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats); 3258 if (copy_rx_sa_stats(skb, &rx_sa_stats)) { 3259 nla_nest_cancel(skb, attr); 3260 nla_nest_cancel(skb, rxsa_list); 3261 nla_nest_cancel(skb, rxsc_nest); 3262 nla_nest_cancel(skb, rxsc_list); 3263 goto nla_put_failure; 3264 } 3265 nla_nest_end(skb, attr); 3266 3267 if (secy->xpn) { 3268 pn = rx_sa->next_pn; 3269 pn_len = MACSEC_XPN_PN_LEN; 3270 } else { 3271 pn = rx_sa->next_pn_halves.lower; 3272 pn_len = MACSEC_DEFAULT_PN_LEN; 3273 } 3274 3275 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3276 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3277 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 3278 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) || 3279 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 3280 nla_nest_cancel(skb, rxsa_nest); 3281 nla_nest_cancel(skb, rxsc_nest); 3282 nla_nest_cancel(skb, rxsc_list); 3283 goto nla_put_failure; 3284 } 3285 nla_nest_end(skb, rxsa_nest); 3286 } 3287 3288 nla_nest_end(skb, rxsa_list); 3289 nla_nest_end(skb, rxsc_nest); 3290 } 3291 3292 nla_nest_end(skb, rxsc_list); 3293 3294 genlmsg_end(skb, hdr); 3295 3296 return 0; 3297 3298 nla_put_failure: 3299 genlmsg_cancel(skb, hdr); 3300 return -EMSGSIZE; 3301 } 3302 3303 static int macsec_generation = 1; /* protected by RTNL */ 3304 3305 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 3306 { 3307 struct net *net = sock_net(skb->sk); 3308 struct net_device *dev; 3309 int dev_idx, d; 3310 3311 dev_idx = cb->args[0]; 3312 3313 d = 0; 3314 rtnl_lock(); 3315 3316 cb->seq = macsec_generation; 3317 3318 for_each_netdev(net, dev) { 3319 struct macsec_secy *secy; 3320 3321 if (d < dev_idx) 3322 goto next; 3323 3324 if (!netif_is_macsec(dev)) 3325 goto next; 3326 3327 secy = &macsec_priv(dev)->secy; 3328 if (dump_secy(secy, dev, skb, cb) < 0) 3329 goto done; 3330 next: 3331 d++; 3332 } 3333 3334 done: 3335 rtnl_unlock(); 3336 cb->args[0] = d; 3337 return skb->len; 3338 } 3339 3340 static const struct genl_small_ops macsec_genl_ops[] = { 3341 { 3342 .cmd = MACSEC_CMD_GET_TXSC, 3343 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3344 .dumpit = macsec_dump_txsc, 3345 }, 3346 { 3347 .cmd = MACSEC_CMD_ADD_RXSC, 3348 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3349 .doit = macsec_add_rxsc, 3350 .flags = GENL_ADMIN_PERM, 3351 }, 3352 { 3353 .cmd = MACSEC_CMD_DEL_RXSC, 3354 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3355 .doit = macsec_del_rxsc, 3356 .flags = GENL_ADMIN_PERM, 3357 }, 3358 { 3359 .cmd = MACSEC_CMD_UPD_RXSC, 3360 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3361 .doit = macsec_upd_rxsc, 3362 .flags = GENL_ADMIN_PERM, 3363 }, 3364 { 3365 .cmd = MACSEC_CMD_ADD_TXSA, 3366 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3367 .doit = macsec_add_txsa, 3368 .flags = GENL_ADMIN_PERM, 3369 }, 3370 { 3371 .cmd = MACSEC_CMD_DEL_TXSA, 3372 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3373 .doit = macsec_del_txsa, 3374 .flags = GENL_ADMIN_PERM, 3375 }, 3376 { 3377 .cmd = MACSEC_CMD_UPD_TXSA, 3378 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3379 .doit = macsec_upd_txsa, 3380 .flags = GENL_ADMIN_PERM, 3381 }, 3382 { 3383 .cmd = MACSEC_CMD_ADD_RXSA, 3384 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3385 .doit = macsec_add_rxsa, 3386 .flags = GENL_ADMIN_PERM, 3387 }, 3388 { 3389 .cmd = MACSEC_CMD_DEL_RXSA, 3390 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3391 .doit = macsec_del_rxsa, 3392 .flags = GENL_ADMIN_PERM, 3393 }, 3394 { 3395 .cmd = MACSEC_CMD_UPD_RXSA, 3396 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3397 .doit = macsec_upd_rxsa, 3398 .flags = GENL_ADMIN_PERM, 3399 }, 3400 { 3401 .cmd = MACSEC_CMD_UPD_OFFLOAD, 3402 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3403 .doit = macsec_upd_offload, 3404 .flags = GENL_ADMIN_PERM, 3405 }, 3406 }; 3407 3408 static struct genl_family macsec_fam __ro_after_init = { 3409 .name = MACSEC_GENL_NAME, 3410 .hdrsize = 0, 3411 .version = MACSEC_GENL_VERSION, 3412 .maxattr = MACSEC_ATTR_MAX, 3413 .policy = macsec_genl_policy, 3414 .netnsok = true, 3415 .module = THIS_MODULE, 3416 .small_ops = macsec_genl_ops, 3417 .n_small_ops = ARRAY_SIZE(macsec_genl_ops), 3418 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1, 3419 }; 3420 3421 static struct sk_buff *macsec_insert_tx_tag(struct sk_buff *skb, 3422 struct net_device *dev) 3423 { 3424 struct macsec_dev *macsec = macsec_priv(dev); 3425 const struct macsec_ops *ops; 3426 struct phy_device *phydev; 3427 struct macsec_context ctx; 3428 int skb_final_len; 3429 int err; 3430 3431 ops = macsec_get_ops(macsec, &ctx); 3432 skb_final_len = skb->len - ETH_HLEN + ops->needed_headroom + 3433 ops->needed_tailroom; 3434 if (unlikely(skb_final_len > macsec->real_dev->mtu)) { 3435 err = -EINVAL; 3436 goto cleanup; 3437 } 3438 3439 phydev = macsec->real_dev->phydev; 3440 3441 err = skb_ensure_writable_head_tail(skb, dev); 3442 if (unlikely(err < 0)) 3443 goto cleanup; 3444 3445 err = ops->mdo_insert_tx_tag(phydev, skb); 3446 if (unlikely(err)) 3447 goto cleanup; 3448 3449 return skb; 3450 cleanup: 3451 kfree_skb(skb); 3452 return ERR_PTR(err); 3453 } 3454 3455 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 3456 struct net_device *dev) 3457 { 3458 struct macsec_dev *macsec = netdev_priv(dev); 3459 struct macsec_secy *secy = &macsec->secy; 3460 struct pcpu_secy_stats *secy_stats; 3461 int ret, len; 3462 3463 if (macsec_is_offloaded(netdev_priv(dev))) { 3464 struct metadata_dst *md_dst = secy->tx_sc.md_dst; 3465 3466 skb_dst_drop(skb); 3467 dst_hold(&md_dst->dst); 3468 skb_dst_set(skb, &md_dst->dst); 3469 3470 if (macsec->insert_tx_tag) { 3471 skb = macsec_insert_tx_tag(skb, dev); 3472 if (IS_ERR(skb)) { 3473 DEV_STATS_INC(dev, tx_dropped); 3474 return NETDEV_TX_OK; 3475 } 3476 } 3477 3478 skb->dev = macsec->real_dev; 3479 return dev_queue_xmit(skb); 3480 } 3481 3482 /* 10.5 */ 3483 if (!secy->protect_frames) { 3484 secy_stats = this_cpu_ptr(macsec->stats); 3485 u64_stats_update_begin(&secy_stats->syncp); 3486 secy_stats->stats.OutPktsUntagged++; 3487 u64_stats_update_end(&secy_stats->syncp); 3488 skb->dev = macsec->real_dev; 3489 len = skb->len; 3490 ret = dev_queue_xmit(skb); 3491 count_tx(dev, ret, len); 3492 return ret; 3493 } 3494 3495 if (!secy->operational) { 3496 kfree_skb(skb); 3497 DEV_STATS_INC(dev, tx_dropped); 3498 return NETDEV_TX_OK; 3499 } 3500 3501 len = skb->len; 3502 skb = macsec_encrypt(skb, dev); 3503 if (IS_ERR(skb)) { 3504 if (PTR_ERR(skb) != -EINPROGRESS) 3505 DEV_STATS_INC(dev, tx_dropped); 3506 return NETDEV_TX_OK; 3507 } 3508 3509 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 3510 3511 macsec_encrypt_finish(skb, dev); 3512 ret = dev_queue_xmit(skb); 3513 count_tx(dev, ret, len); 3514 return ret; 3515 } 3516 3517 #define MACSEC_FEATURES \ 3518 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 3519 NETIF_F_HW_VLAN_STAG_FILTER | NETIF_F_HW_VLAN_CTAG_FILTER) 3520 3521 #define MACSEC_OFFLOAD_FEATURES \ 3522 (MACSEC_FEATURES | NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES | \ 3523 NETIF_F_LRO | NETIF_F_RXHASH | NETIF_F_CSUM_MASK | NETIF_F_RXCSUM) 3524 3525 static int macsec_dev_init(struct net_device *dev) 3526 { 3527 struct macsec_dev *macsec = macsec_priv(dev); 3528 struct net_device *real_dev = macsec->real_dev; 3529 int err; 3530 3531 err = gro_cells_init(&macsec->gro_cells, dev); 3532 if (err) 3533 return err; 3534 3535 macsec_inherit_tso_max(dev); 3536 3537 dev->hw_features = real_dev->hw_features & MACSEC_OFFLOAD_FEATURES; 3538 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 3539 3540 dev->features = real_dev->features & MACSEC_OFFLOAD_FEATURES; 3541 dev->features |= NETIF_F_GSO_SOFTWARE; 3542 dev->lltx = true; 3543 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 3544 3545 macsec_set_head_tail_room(dev); 3546 3547 if (is_zero_ether_addr(dev->dev_addr)) 3548 eth_hw_addr_inherit(dev, real_dev); 3549 if (is_zero_ether_addr(dev->broadcast)) 3550 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 3551 3552 /* Get macsec's reference to real_dev */ 3553 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL); 3554 3555 return 0; 3556 } 3557 3558 static void macsec_dev_uninit(struct net_device *dev) 3559 { 3560 struct macsec_dev *macsec = macsec_priv(dev); 3561 3562 gro_cells_destroy(&macsec->gro_cells); 3563 } 3564 3565 static netdev_features_t macsec_fix_features(struct net_device *dev, 3566 netdev_features_t features) 3567 { 3568 struct macsec_dev *macsec = macsec_priv(dev); 3569 struct net_device *real_dev = macsec->real_dev; 3570 netdev_features_t mask; 3571 3572 mask = macsec_is_offloaded(macsec) ? MACSEC_OFFLOAD_FEATURES 3573 : MACSEC_FEATURES; 3574 3575 features &= (real_dev->features & mask) | 3576 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 3577 3578 return features; 3579 } 3580 3581 static int macsec_dev_open(struct net_device *dev) 3582 { 3583 struct macsec_dev *macsec = macsec_priv(dev); 3584 struct net_device *real_dev = macsec->real_dev; 3585 int err; 3586 3587 err = dev_uc_add(real_dev, dev->dev_addr); 3588 if (err < 0) 3589 return err; 3590 3591 if (dev->flags & IFF_ALLMULTI) { 3592 err = dev_set_allmulti(real_dev, 1); 3593 if (err < 0) 3594 goto del_unicast; 3595 } 3596 3597 if (dev->flags & IFF_PROMISC) { 3598 err = dev_set_promiscuity(real_dev, 1); 3599 if (err < 0) 3600 goto clear_allmulti; 3601 } 3602 3603 /* If h/w offloading is available, propagate to the device */ 3604 if (macsec_is_offloaded(macsec)) { 3605 const struct macsec_ops *ops; 3606 struct macsec_context ctx; 3607 3608 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3609 if (!ops) { 3610 err = -EOPNOTSUPP; 3611 goto clear_allmulti; 3612 } 3613 3614 ctx.secy = &macsec->secy; 3615 err = macsec_offload(ops->mdo_dev_open, &ctx); 3616 if (err) 3617 goto clear_allmulti; 3618 } 3619 3620 if (netif_carrier_ok(real_dev)) 3621 netif_carrier_on(dev); 3622 3623 return 0; 3624 clear_allmulti: 3625 if (dev->flags & IFF_ALLMULTI) 3626 dev_set_allmulti(real_dev, -1); 3627 del_unicast: 3628 dev_uc_del(real_dev, dev->dev_addr); 3629 netif_carrier_off(dev); 3630 return err; 3631 } 3632 3633 static int macsec_dev_stop(struct net_device *dev) 3634 { 3635 struct macsec_dev *macsec = macsec_priv(dev); 3636 struct net_device *real_dev = macsec->real_dev; 3637 3638 netif_carrier_off(dev); 3639 3640 /* If h/w offloading is available, propagate to the device */ 3641 if (macsec_is_offloaded(macsec)) { 3642 const struct macsec_ops *ops; 3643 struct macsec_context ctx; 3644 3645 ops = macsec_get_ops(macsec, &ctx); 3646 if (ops) { 3647 ctx.secy = &macsec->secy; 3648 macsec_offload(ops->mdo_dev_stop, &ctx); 3649 } 3650 } 3651 3652 dev_mc_unsync(real_dev, dev); 3653 dev_uc_unsync(real_dev, dev); 3654 3655 if (dev->flags & IFF_ALLMULTI) 3656 dev_set_allmulti(real_dev, -1); 3657 3658 if (dev->flags & IFF_PROMISC) 3659 dev_set_promiscuity(real_dev, -1); 3660 3661 dev_uc_del(real_dev, dev->dev_addr); 3662 3663 return 0; 3664 } 3665 3666 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 3667 { 3668 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3669 3670 if (!(dev->flags & IFF_UP)) 3671 return; 3672 3673 if (change & IFF_ALLMULTI) 3674 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 3675 3676 if (change & IFF_PROMISC) 3677 dev_set_promiscuity(real_dev, 3678 dev->flags & IFF_PROMISC ? 1 : -1); 3679 } 3680 3681 static void macsec_dev_set_rx_mode(struct net_device *dev) 3682 { 3683 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3684 3685 dev_mc_sync(real_dev, dev); 3686 dev_uc_sync(real_dev, dev); 3687 } 3688 3689 static int macsec_set_mac_address(struct net_device *dev, void *p) 3690 { 3691 struct macsec_dev *macsec = macsec_priv(dev); 3692 struct net_device *real_dev = macsec->real_dev; 3693 struct sockaddr *addr = p; 3694 u8 old_addr[ETH_ALEN]; 3695 int err; 3696 3697 if (!is_valid_ether_addr(addr->sa_data)) 3698 return -EADDRNOTAVAIL; 3699 3700 if (dev->flags & IFF_UP) { 3701 err = dev_uc_add(real_dev, addr->sa_data); 3702 if (err < 0) 3703 return err; 3704 } 3705 3706 ether_addr_copy(old_addr, dev->dev_addr); 3707 eth_hw_addr_set(dev, addr->sa_data); 3708 3709 /* If h/w offloading is available, propagate to the device */ 3710 if (macsec_is_offloaded(macsec)) { 3711 const struct macsec_ops *ops; 3712 struct macsec_context ctx; 3713 3714 ops = macsec_get_ops(macsec, &ctx); 3715 if (!ops) { 3716 err = -EOPNOTSUPP; 3717 goto restore_old_addr; 3718 } 3719 3720 ctx.secy = &macsec->secy; 3721 err = macsec_offload(ops->mdo_upd_secy, &ctx); 3722 if (err) 3723 goto restore_old_addr; 3724 } 3725 3726 if (dev->flags & IFF_UP) 3727 dev_uc_del(real_dev, old_addr); 3728 3729 return 0; 3730 3731 restore_old_addr: 3732 if (dev->flags & IFF_UP) 3733 dev_uc_del(real_dev, addr->sa_data); 3734 3735 eth_hw_addr_set(dev, old_addr); 3736 3737 return err; 3738 } 3739 3740 static int macsec_vlan_rx_add_vid(struct net_device *dev, 3741 __be16 proto, u16 vid) 3742 { 3743 struct macsec_dev *macsec = netdev_priv(dev); 3744 3745 if (!macsec_is_offloaded(macsec)) 3746 return 0; 3747 3748 return vlan_vid_add(macsec->real_dev, proto, vid); 3749 } 3750 3751 static int macsec_vlan_rx_kill_vid(struct net_device *dev, 3752 __be16 proto, u16 vid) 3753 { 3754 struct macsec_dev *macsec = netdev_priv(dev); 3755 3756 if (!macsec_is_offloaded(macsec)) 3757 return 0; 3758 3759 vlan_vid_del(macsec->real_dev, proto, vid); 3760 return 0; 3761 } 3762 3763 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 3764 { 3765 struct macsec_dev *macsec = macsec_priv(dev); 3766 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 3767 3768 if (macsec->real_dev->mtu - extra < new_mtu) 3769 return -ERANGE; 3770 3771 WRITE_ONCE(dev->mtu, new_mtu); 3772 3773 return 0; 3774 } 3775 3776 static void macsec_get_stats64(struct net_device *dev, 3777 struct rtnl_link_stats64 *s) 3778 { 3779 if (!dev->tstats) 3780 return; 3781 3782 dev_fetch_sw_netstats(s, dev->tstats); 3783 3784 s->rx_dropped = DEV_STATS_READ(dev, rx_dropped); 3785 s->tx_dropped = DEV_STATS_READ(dev, tx_dropped); 3786 s->rx_errors = DEV_STATS_READ(dev, rx_errors); 3787 } 3788 3789 static int macsec_get_iflink(const struct net_device *dev) 3790 { 3791 return READ_ONCE(macsec_priv(dev)->real_dev->ifindex); 3792 } 3793 3794 static const struct net_device_ops macsec_netdev_ops = { 3795 .ndo_init = macsec_dev_init, 3796 .ndo_uninit = macsec_dev_uninit, 3797 .ndo_open = macsec_dev_open, 3798 .ndo_stop = macsec_dev_stop, 3799 .ndo_fix_features = macsec_fix_features, 3800 .ndo_change_mtu = macsec_change_mtu, 3801 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 3802 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 3803 .ndo_set_mac_address = macsec_set_mac_address, 3804 .ndo_vlan_rx_add_vid = macsec_vlan_rx_add_vid, 3805 .ndo_vlan_rx_kill_vid = macsec_vlan_rx_kill_vid, 3806 .ndo_start_xmit = macsec_start_xmit, 3807 .ndo_get_stats64 = macsec_get_stats64, 3808 .ndo_get_iflink = macsec_get_iflink, 3809 }; 3810 3811 static const struct device_type macsec_type = { 3812 .name = "macsec", 3813 }; 3814 3815 static int validate_cipher_suite(const struct nlattr *attr, 3816 struct netlink_ext_ack *extack); 3817 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 3818 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 3819 [IFLA_MACSEC_PORT] = { .type = NLA_U16 }, 3820 [IFLA_MACSEC_ICV_LEN] = NLA_POLICY_RANGE(NLA_U8, MACSEC_MIN_ICV_LEN, MACSEC_STD_ICV_LEN), 3821 [IFLA_MACSEC_CIPHER_SUITE] = NLA_POLICY_VALIDATE_FN(NLA_U64, validate_cipher_suite), 3822 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 3823 [IFLA_MACSEC_ENCODING_SA] = NLA_POLICY_MAX(NLA_U8, MACSEC_NUM_AN - 1), 3824 [IFLA_MACSEC_ENCRYPT] = NLA_POLICY_MAX(NLA_U8, 1), 3825 [IFLA_MACSEC_PROTECT] = NLA_POLICY_MAX(NLA_U8, 1), 3826 [IFLA_MACSEC_INC_SCI] = NLA_POLICY_MAX(NLA_U8, 1), 3827 [IFLA_MACSEC_ES] = NLA_POLICY_MAX(NLA_U8, 1), 3828 [IFLA_MACSEC_SCB] = NLA_POLICY_MAX(NLA_U8, 1), 3829 [IFLA_MACSEC_REPLAY_PROTECT] = NLA_POLICY_MAX(NLA_U8, 1), 3830 [IFLA_MACSEC_VALIDATION] = NLA_POLICY_MAX(NLA_U8, MACSEC_VALIDATE_MAX), 3831 [IFLA_MACSEC_OFFLOAD] = NLA_POLICY_MAX(NLA_U8, MACSEC_OFFLOAD_MAX), 3832 }; 3833 3834 static void macsec_free_netdev(struct net_device *dev) 3835 { 3836 struct macsec_dev *macsec = macsec_priv(dev); 3837 3838 dst_release(&macsec->secy.tx_sc.md_dst->dst); 3839 free_percpu(macsec->stats); 3840 free_percpu(macsec->secy.tx_sc.stats); 3841 3842 /* Get rid of the macsec's reference to real_dev */ 3843 netdev_put(macsec->real_dev, &macsec->dev_tracker); 3844 } 3845 3846 static void macsec_setup(struct net_device *dev) 3847 { 3848 ether_setup(dev); 3849 dev->min_mtu = 0; 3850 dev->max_mtu = ETH_MAX_MTU; 3851 dev->priv_flags |= IFF_NO_QUEUE | IFF_UNICAST_FLT; 3852 dev->netdev_ops = &macsec_netdev_ops; 3853 dev->needs_free_netdev = true; 3854 dev->priv_destructor = macsec_free_netdev; 3855 SET_NETDEV_DEVTYPE(dev, &macsec_type); 3856 3857 eth_zero_addr(dev->broadcast); 3858 } 3859 3860 static int macsec_changelink_common(struct net_device *dev, 3861 struct nlattr *data[]) 3862 { 3863 struct macsec_secy *secy; 3864 struct macsec_tx_sc *tx_sc; 3865 3866 secy = &macsec_priv(dev)->secy; 3867 tx_sc = &secy->tx_sc; 3868 3869 if (data[IFLA_MACSEC_ENCODING_SA]) { 3870 struct macsec_tx_sa *tx_sa; 3871 3872 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3873 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 3874 3875 secy->operational = tx_sa && tx_sa->active; 3876 } 3877 3878 if (data[IFLA_MACSEC_ENCRYPT]) 3879 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3880 3881 if (data[IFLA_MACSEC_PROTECT]) 3882 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3883 3884 if (data[IFLA_MACSEC_INC_SCI]) 3885 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3886 3887 if (data[IFLA_MACSEC_ES]) 3888 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3889 3890 if (data[IFLA_MACSEC_SCB]) 3891 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3892 3893 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3894 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3895 3896 if (data[IFLA_MACSEC_VALIDATION]) 3897 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3898 3899 if (data[IFLA_MACSEC_CIPHER_SUITE]) { 3900 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) { 3901 case MACSEC_CIPHER_ID_GCM_AES_128: 3902 case MACSEC_DEFAULT_CIPHER_ID: 3903 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3904 secy->xpn = false; 3905 break; 3906 case MACSEC_CIPHER_ID_GCM_AES_256: 3907 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3908 secy->xpn = false; 3909 break; 3910 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 3911 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3912 secy->xpn = true; 3913 break; 3914 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 3915 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3916 secy->xpn = true; 3917 break; 3918 default: 3919 return -EINVAL; 3920 } 3921 } 3922 3923 if (data[IFLA_MACSEC_WINDOW]) { 3924 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3925 3926 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window 3927 * for XPN cipher suites */ 3928 if (secy->xpn && 3929 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW) 3930 return -EINVAL; 3931 } 3932 3933 return 0; 3934 } 3935 3936 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3937 struct nlattr *data[], 3938 struct netlink_ext_ack *extack) 3939 { 3940 struct macsec_dev *macsec = macsec_priv(dev); 3941 bool macsec_offload_state_change = false; 3942 enum macsec_offload offload; 3943 struct macsec_tx_sc tx_sc; 3944 struct macsec_secy secy; 3945 int ret; 3946 3947 if (!data) 3948 return 0; 3949 3950 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3951 data[IFLA_MACSEC_ICV_LEN] || 3952 data[IFLA_MACSEC_SCI] || 3953 data[IFLA_MACSEC_PORT]) 3954 return -EINVAL; 3955 3956 /* Keep a copy of unmodified secy and tx_sc, in case the offload 3957 * propagation fails, to revert macsec_changelink_common. 3958 */ 3959 memcpy(&secy, &macsec->secy, sizeof(secy)); 3960 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc)); 3961 3962 ret = macsec_changelink_common(dev, data); 3963 if (ret) 3964 goto cleanup; 3965 3966 if (data[IFLA_MACSEC_OFFLOAD]) { 3967 offload = nla_get_u8(data[IFLA_MACSEC_OFFLOAD]); 3968 if (macsec->offload != offload) { 3969 macsec_offload_state_change = true; 3970 ret = macsec_update_offload(dev, offload, extack); 3971 if (ret) 3972 goto cleanup; 3973 } 3974 } 3975 3976 /* If h/w offloading is available, propagate to the device */ 3977 if (!macsec_offload_state_change && macsec_is_offloaded(macsec)) { 3978 const struct macsec_ops *ops; 3979 struct macsec_context ctx; 3980 3981 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3982 if (!ops) { 3983 ret = -EOPNOTSUPP; 3984 goto cleanup; 3985 } 3986 3987 ctx.secy = &macsec->secy; 3988 ret = macsec_offload(ops->mdo_upd_secy, &ctx); 3989 if (ret) 3990 goto cleanup; 3991 } 3992 3993 return 0; 3994 3995 cleanup: 3996 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc)); 3997 memcpy(&macsec->secy, &secy, sizeof(secy)); 3998 3999 return ret; 4000 } 4001 4002 static void macsec_del_dev(struct macsec_dev *macsec) 4003 { 4004 int i; 4005 4006 while (macsec->secy.rx_sc) { 4007 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 4008 4009 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 4010 free_rx_sc(rx_sc); 4011 } 4012 4013 for (i = 0; i < MACSEC_NUM_AN; i++) { 4014 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 4015 4016 if (sa) { 4017 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 4018 clear_tx_sa(sa); 4019 } 4020 } 4021 } 4022 4023 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 4024 { 4025 struct macsec_dev *macsec = macsec_priv(dev); 4026 struct net_device *real_dev = macsec->real_dev; 4027 4028 /* If h/w offloading is available, propagate to the device */ 4029 if (macsec_is_offloaded(macsec)) { 4030 const struct macsec_ops *ops; 4031 struct macsec_context ctx; 4032 4033 ops = macsec_get_ops(netdev_priv(dev), &ctx); 4034 if (ops) { 4035 ctx.secy = &macsec->secy; 4036 macsec_offload(ops->mdo_del_secy, &ctx); 4037 } 4038 } 4039 4040 unregister_netdevice_queue(dev, head); 4041 list_del_rcu(&macsec->secys); 4042 macsec_del_dev(macsec); 4043 netdev_upper_dev_unlink(real_dev, dev); 4044 4045 macsec_generation++; 4046 } 4047 4048 static void macsec_dellink(struct net_device *dev, struct list_head *head) 4049 { 4050 struct macsec_dev *macsec = macsec_priv(dev); 4051 struct net_device *real_dev = macsec->real_dev; 4052 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 4053 4054 macsec_common_dellink(dev, head); 4055 4056 if (list_empty(&rxd->secys)) { 4057 netdev_rx_handler_unregister(real_dev); 4058 kfree(rxd); 4059 } 4060 } 4061 4062 static int register_macsec_dev(struct net_device *real_dev, 4063 struct net_device *dev) 4064 { 4065 struct macsec_dev *macsec = macsec_priv(dev); 4066 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 4067 4068 if (!rxd) { 4069 int err; 4070 4071 rxd = kmalloc_obj(*rxd); 4072 if (!rxd) 4073 return -ENOMEM; 4074 4075 INIT_LIST_HEAD(&rxd->secys); 4076 4077 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 4078 rxd); 4079 if (err < 0) { 4080 kfree(rxd); 4081 return err; 4082 } 4083 } 4084 4085 list_add_tail_rcu(&macsec->secys, &rxd->secys); 4086 return 0; 4087 } 4088 4089 static bool sci_exists(struct net_device *dev, sci_t sci) 4090 { 4091 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 4092 struct macsec_dev *macsec; 4093 4094 list_for_each_entry(macsec, &rxd->secys, secys) { 4095 if (macsec->secy.sci == sci) 4096 return true; 4097 } 4098 4099 return false; 4100 } 4101 4102 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 4103 { 4104 return make_sci(dev->dev_addr, port); 4105 } 4106 4107 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 4108 { 4109 struct macsec_dev *macsec = macsec_priv(dev); 4110 struct macsec_secy *secy = &macsec->secy; 4111 4112 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 4113 if (!macsec->stats) 4114 return -ENOMEM; 4115 4116 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 4117 if (!secy->tx_sc.stats) 4118 return -ENOMEM; 4119 4120 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL); 4121 if (!secy->tx_sc.md_dst) 4122 /* macsec and secy percpu stats will be freed when unregistering 4123 * net_device in macsec_free_netdev() 4124 */ 4125 return -ENOMEM; 4126 4127 if (sci == MACSEC_UNDEF_SCI) 4128 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4129 4130 secy->netdev = dev; 4131 secy->operational = true; 4132 secy->key_len = DEFAULT_SAK_LEN; 4133 secy->icv_len = icv_len; 4134 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 4135 secy->protect_frames = true; 4136 secy->replay_protect = false; 4137 secy->xpn = DEFAULT_XPN; 4138 4139 secy->sci = sci; 4140 secy->tx_sc.md_dst->u.macsec_info.sci = sci; 4141 secy->tx_sc.active = true; 4142 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 4143 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 4144 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 4145 secy->tx_sc.end_station = false; 4146 secy->tx_sc.scb = false; 4147 4148 return 0; 4149 } 4150 4151 static struct lock_class_key macsec_netdev_addr_lock_key; 4152 4153 static int macsec_newlink(struct net_device *dev, 4154 struct rtnl_newlink_params *params, 4155 struct netlink_ext_ack *extack) 4156 { 4157 struct net *link_net = rtnl_newlink_link_net(params); 4158 struct macsec_dev *macsec = macsec_priv(dev); 4159 struct nlattr **data = params->data; 4160 struct nlattr **tb = params->tb; 4161 rx_handler_func_t *rx_handler; 4162 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4163 struct net_device *real_dev; 4164 int err, mtu; 4165 sci_t sci; 4166 4167 if (!tb[IFLA_LINK]) 4168 return -EINVAL; 4169 real_dev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK])); 4170 if (!real_dev) 4171 return -ENODEV; 4172 if (real_dev->type != ARPHRD_ETHER) 4173 return -EINVAL; 4174 4175 dev->priv_flags |= IFF_MACSEC; 4176 4177 macsec->real_dev = real_dev; 4178 4179 if (data && data[IFLA_MACSEC_OFFLOAD]) 4180 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]); 4181 else 4182 /* MACsec offloading is off by default */ 4183 macsec->offload = MACSEC_OFFLOAD_OFF; 4184 4185 /* Check if the offloading mode is supported by the underlying layers */ 4186 if (macsec->offload != MACSEC_OFFLOAD_OFF && 4187 !macsec_check_offload(macsec->offload, macsec)) 4188 return -EOPNOTSUPP; 4189 4190 /* send_sci must be set to true when transmit sci explicitly is set */ 4191 if ((data && data[IFLA_MACSEC_SCI]) && 4192 (data && data[IFLA_MACSEC_INC_SCI])) { 4193 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 4194 4195 if (!send_sci) 4196 return -EINVAL; 4197 } 4198 4199 if (data && data[IFLA_MACSEC_ICV_LEN]) 4200 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4201 mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 4202 if (mtu < 0) 4203 dev->mtu = 0; 4204 else 4205 dev->mtu = mtu; 4206 4207 rx_handler = rtnl_dereference(real_dev->rx_handler); 4208 if (rx_handler && rx_handler != macsec_handle_frame) 4209 return -EBUSY; 4210 4211 err = register_netdevice(dev); 4212 if (err < 0) 4213 return err; 4214 4215 netdev_lockdep_set_classes(dev); 4216 lockdep_set_class(&dev->addr_list_lock, 4217 &macsec_netdev_addr_lock_key); 4218 4219 err = netdev_upper_dev_link(real_dev, dev, extack); 4220 if (err < 0) 4221 goto unregister; 4222 4223 /* need to be already registered so that ->init has run and 4224 * the MAC addr is set 4225 */ 4226 if (data && data[IFLA_MACSEC_SCI]) 4227 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 4228 else if (data && data[IFLA_MACSEC_PORT]) 4229 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 4230 else 4231 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4232 4233 if (rx_handler && sci_exists(real_dev, sci)) { 4234 err = -EBUSY; 4235 goto unlink; 4236 } 4237 4238 err = macsec_add_dev(dev, sci, icv_len); 4239 if (err) 4240 goto unlink; 4241 4242 if (data) { 4243 err = macsec_changelink_common(dev, data); 4244 if (err) 4245 goto del_dev; 4246 } 4247 4248 /* If h/w offloading is available, propagate to the device */ 4249 if (macsec_is_offloaded(macsec)) { 4250 const struct macsec_ops *ops; 4251 struct macsec_context ctx; 4252 4253 ops = macsec_get_ops(macsec, &ctx); 4254 if (ops) { 4255 ctx.secy = &macsec->secy; 4256 err = macsec_offload(ops->mdo_add_secy, &ctx); 4257 if (err) 4258 goto del_dev; 4259 4260 macsec->insert_tx_tag = 4261 macsec_needs_tx_tag(macsec, ops); 4262 } 4263 } 4264 4265 err = register_macsec_dev(real_dev, dev); 4266 if (err < 0) 4267 goto del_dev; 4268 4269 netdev_update_features(dev); 4270 netif_stacked_transfer_operstate(real_dev, dev); 4271 linkwatch_fire_event(dev); 4272 4273 macsec_generation++; 4274 4275 return 0; 4276 4277 del_dev: 4278 macsec_del_dev(macsec); 4279 unlink: 4280 netdev_upper_dev_unlink(real_dev, dev); 4281 unregister: 4282 unregister_netdevice(dev); 4283 return err; 4284 } 4285 4286 static int validate_cipher_suite(const struct nlattr *attr, 4287 struct netlink_ext_ack *extack) 4288 { 4289 switch (nla_get_u64(attr)) { 4290 case MACSEC_CIPHER_ID_GCM_AES_128: 4291 case MACSEC_CIPHER_ID_GCM_AES_256: 4292 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 4293 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 4294 case MACSEC_DEFAULT_CIPHER_ID: 4295 return 0; 4296 default: 4297 return -EINVAL; 4298 } 4299 } 4300 4301 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], 4302 struct netlink_ext_ack *extack) 4303 { 4304 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4305 bool es, scb, sci; 4306 4307 if (!data) 4308 return 0; 4309 4310 if (data[IFLA_MACSEC_ICV_LEN]) { 4311 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4312 if (icv_len != MACSEC_DEFAULT_ICV_LEN) { 4313 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 4314 struct crypto_aead *dummy_tfm; 4315 4316 dummy_tfm = macsec_alloc_tfm(dummy_key, 4317 DEFAULT_SAK_LEN, 4318 icv_len); 4319 if (IS_ERR(dummy_tfm)) 4320 return PTR_ERR(dummy_tfm); 4321 crypto_free_aead(dummy_tfm); 4322 } 4323 } 4324 4325 es = nla_get_u8_default(data[IFLA_MACSEC_ES], false); 4326 sci = nla_get_u8_default(data[IFLA_MACSEC_INC_SCI], false); 4327 scb = nla_get_u8_default(data[IFLA_MACSEC_SCB], false); 4328 4329 if ((sci && (scb || es)) || (scb && es)) 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 struct macsec_rxh_data *rxd; 4451 struct macsec_dev *m, *n; 4452 LIST_HEAD(head); 4453 4454 if (!is_macsec_master(real_dev)) 4455 return NOTIFY_DONE; 4456 4457 rxd = macsec_data_rtnl(real_dev); 4458 4459 switch (event) { 4460 case NETDEV_DOWN: 4461 case NETDEV_UP: 4462 case NETDEV_CHANGE: 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 case NETDEV_UNREGISTER: 4470 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4471 macsec_common_dellink(m->secy.netdev, &head); 4472 } 4473 4474 netdev_rx_handler_unregister(real_dev); 4475 kfree(rxd); 4476 4477 unregister_netdevice_many(&head); 4478 break; 4479 case NETDEV_CHANGEMTU: 4480 list_for_each_entry(m, &rxd->secys, secys) { 4481 struct net_device *dev = m->secy.netdev; 4482 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 4483 macsec_extra_len(true)); 4484 4485 if (dev->mtu > mtu) 4486 dev_set_mtu(dev, mtu); 4487 } 4488 break; 4489 case NETDEV_FEAT_CHANGE: 4490 list_for_each_entry(m, &rxd->secys, secys) { 4491 macsec_inherit_tso_max(m->secy.netdev); 4492 netdev_update_features(m->secy.netdev); 4493 } 4494 break; 4495 } 4496 4497 return NOTIFY_OK; 4498 } 4499 4500 static struct notifier_block macsec_notifier = { 4501 .notifier_call = macsec_notify, 4502 }; 4503 4504 static int __init macsec_init(void) 4505 { 4506 int err; 4507 4508 pr_info("MACsec IEEE 802.1AE\n"); 4509 err = register_netdevice_notifier(&macsec_notifier); 4510 if (err) 4511 return err; 4512 4513 err = rtnl_link_register(&macsec_link_ops); 4514 if (err) 4515 goto notifier; 4516 4517 err = genl_register_family(&macsec_fam); 4518 if (err) 4519 goto rtnl; 4520 4521 return 0; 4522 4523 rtnl: 4524 rtnl_link_unregister(&macsec_link_ops); 4525 notifier: 4526 unregister_netdevice_notifier(&macsec_notifier); 4527 return err; 4528 } 4529 4530 static void __exit macsec_exit(void) 4531 { 4532 genl_unregister_family(&macsec_fam); 4533 rtnl_link_unregister(&macsec_link_ops); 4534 unregister_netdevice_notifier(&macsec_notifier); 4535 rcu_barrier(); 4536 } 4537 4538 module_init(macsec_init); 4539 module_exit(macsec_exit); 4540 4541 MODULE_ALIAS_RTNL_LINK("macsec"); 4542 MODULE_ALIAS_GENL_FAMILY("macsec"); 4543 4544 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 4545 MODULE_LICENSE("GPL v2"); 4546