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(sizeof(*rx_sc), GFP_KERNEL); 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 if (*assoc_num >= MACSEC_NUM_AN) 1587 return ERR_PTR(-EINVAL); 1588 1589 secy = &macsec_priv(dev)->secy; 1590 tx_sc = &secy->tx_sc; 1591 1592 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1593 if (!tx_sa) 1594 return ERR_PTR(-ENODEV); 1595 1596 *devp = dev; 1597 *scp = tx_sc; 1598 *secyp = secy; 1599 return tx_sa; 1600 } 1601 1602 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1603 struct nlattr **attrs, 1604 struct nlattr **tb_rxsc, 1605 struct net_device **devp, 1606 struct macsec_secy **secyp) 1607 { 1608 struct net_device *dev; 1609 struct macsec_secy *secy; 1610 struct macsec_rx_sc *rx_sc; 1611 sci_t sci; 1612 1613 dev = get_dev_from_nl(net, attrs); 1614 if (IS_ERR(dev)) 1615 return ERR_CAST(dev); 1616 1617 secy = &macsec_priv(dev)->secy; 1618 1619 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1620 return ERR_PTR(-EINVAL); 1621 1622 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1623 rx_sc = find_rx_sc_rtnl(secy, sci); 1624 if (!rx_sc) 1625 return ERR_PTR(-ENODEV); 1626 1627 *secyp = secy; 1628 *devp = dev; 1629 1630 return rx_sc; 1631 } 1632 1633 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1634 struct nlattr **attrs, 1635 struct nlattr **tb_rxsc, 1636 struct nlattr **tb_sa, 1637 struct net_device **devp, 1638 struct macsec_secy **secyp, 1639 struct macsec_rx_sc **scp, 1640 u8 *assoc_num) 1641 { 1642 struct macsec_rx_sc *rx_sc; 1643 struct macsec_rx_sa *rx_sa; 1644 1645 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1646 return ERR_PTR(-EINVAL); 1647 1648 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1649 if (*assoc_num >= MACSEC_NUM_AN) 1650 return ERR_PTR(-EINVAL); 1651 1652 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1653 if (IS_ERR(rx_sc)) 1654 return ERR_CAST(rx_sc); 1655 1656 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1657 if (!rx_sa) 1658 return ERR_PTR(-ENODEV); 1659 1660 *scp = rx_sc; 1661 return rx_sa; 1662 } 1663 1664 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1665 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1666 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1667 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1668 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED }, 1669 }; 1670 1671 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1672 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1673 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, 1674 }; 1675 1676 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1677 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, 1678 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, 1679 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4), 1680 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY, 1681 .len = MACSEC_KEYID_LEN, }, 1682 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1683 .len = MACSEC_MAX_KEY_LEN, }, 1684 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 }, 1685 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY, 1686 .len = MACSEC_SALT_LEN, }, 1687 }; 1688 1689 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = { 1690 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 }, 1691 }; 1692 1693 /* Offloads an operation to a device driver */ 1694 static int macsec_offload(int (* const func)(struct macsec_context *), 1695 struct macsec_context *ctx) 1696 { 1697 int ret; 1698 1699 if (unlikely(!func)) 1700 return 0; 1701 1702 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1703 mutex_lock(&ctx->phydev->lock); 1704 1705 ret = (*func)(ctx); 1706 1707 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1708 mutex_unlock(&ctx->phydev->lock); 1709 1710 return ret; 1711 } 1712 1713 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1714 { 1715 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1716 return -EINVAL; 1717 1718 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL)) 1719 return -EINVAL; 1720 1721 return 0; 1722 } 1723 1724 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1725 { 1726 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1727 return -EINVAL; 1728 1729 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL)) 1730 return -EINVAL; 1731 1732 return 0; 1733 } 1734 1735 static bool validate_add_rxsa(struct nlattr **attrs) 1736 { 1737 if (!attrs[MACSEC_SA_ATTR_AN] || 1738 !attrs[MACSEC_SA_ATTR_KEY] || 1739 !attrs[MACSEC_SA_ATTR_KEYID]) 1740 return false; 1741 1742 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1743 return false; 1744 1745 if (attrs[MACSEC_SA_ATTR_PN] && 1746 nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 1747 return false; 1748 1749 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1750 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1751 return false; 1752 } 1753 1754 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1755 return false; 1756 1757 return true; 1758 } 1759 1760 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1761 { 1762 struct net_device *dev; 1763 struct nlattr **attrs = info->attrs; 1764 struct macsec_secy *secy; 1765 struct macsec_rx_sc *rx_sc; 1766 struct macsec_rx_sa *rx_sa; 1767 unsigned char assoc_num; 1768 int pn_len; 1769 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1770 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1771 int err; 1772 1773 if (!attrs[MACSEC_ATTR_IFINDEX]) 1774 return -EINVAL; 1775 1776 if (parse_sa_config(attrs, tb_sa)) 1777 return -EINVAL; 1778 1779 if (parse_rxsc_config(attrs, tb_rxsc)) 1780 return -EINVAL; 1781 1782 if (!validate_add_rxsa(tb_sa)) 1783 return -EINVAL; 1784 1785 rtnl_lock(); 1786 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1787 if (IS_ERR(rx_sc)) { 1788 rtnl_unlock(); 1789 return PTR_ERR(rx_sc); 1790 } 1791 1792 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1793 1794 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1795 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1796 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1797 rtnl_unlock(); 1798 return -EINVAL; 1799 } 1800 1801 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1802 if (tb_sa[MACSEC_SA_ATTR_PN] && 1803 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1804 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n", 1805 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1806 rtnl_unlock(); 1807 return -EINVAL; 1808 } 1809 1810 if (secy->xpn) { 1811 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 1812 rtnl_unlock(); 1813 return -EINVAL; 1814 } 1815 1816 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 1817 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n", 1818 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 1819 MACSEC_SALT_LEN); 1820 rtnl_unlock(); 1821 return -EINVAL; 1822 } 1823 } 1824 1825 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1826 if (rx_sa) { 1827 rtnl_unlock(); 1828 return -EBUSY; 1829 } 1830 1831 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1832 if (!rx_sa) { 1833 rtnl_unlock(); 1834 return -ENOMEM; 1835 } 1836 1837 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1838 secy->key_len, secy->icv_len); 1839 if (err < 0) { 1840 kfree(rx_sa); 1841 rtnl_unlock(); 1842 return err; 1843 } 1844 1845 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1846 spin_lock_bh(&rx_sa->lock); 1847 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 1848 spin_unlock_bh(&rx_sa->lock); 1849 } 1850 1851 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1852 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1853 1854 rx_sa->sc = rx_sc; 1855 1856 if (secy->xpn) { 1857 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 1858 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 1859 MACSEC_SALT_LEN); 1860 } 1861 1862 /* If h/w offloading is available, propagate to the device */ 1863 if (macsec_is_offloaded(netdev_priv(dev))) { 1864 const struct macsec_ops *ops; 1865 struct macsec_context ctx; 1866 1867 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1868 if (!ops) { 1869 err = -EOPNOTSUPP; 1870 goto cleanup; 1871 } 1872 1873 ctx.sa.assoc_num = assoc_num; 1874 ctx.sa.rx_sa = rx_sa; 1875 ctx.secy = secy; 1876 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1877 secy->key_len); 1878 1879 err = macsec_offload(ops->mdo_add_rxsa, &ctx); 1880 memzero_explicit(ctx.sa.key, secy->key_len); 1881 if (err) 1882 goto cleanup; 1883 } 1884 1885 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1886 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1887 1888 rtnl_unlock(); 1889 1890 return 0; 1891 1892 cleanup: 1893 macsec_rxsa_put(rx_sa); 1894 rtnl_unlock(); 1895 return err; 1896 } 1897 1898 static bool validate_add_rxsc(struct nlattr **attrs) 1899 { 1900 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1901 return false; 1902 1903 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1904 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1905 return false; 1906 } 1907 1908 return true; 1909 } 1910 1911 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1912 { 1913 struct net_device *dev; 1914 sci_t sci = MACSEC_UNDEF_SCI; 1915 struct nlattr **attrs = info->attrs; 1916 struct macsec_rx_sc *rx_sc; 1917 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1918 struct macsec_secy *secy; 1919 bool active = true; 1920 int ret; 1921 1922 if (!attrs[MACSEC_ATTR_IFINDEX]) 1923 return -EINVAL; 1924 1925 if (parse_rxsc_config(attrs, tb_rxsc)) 1926 return -EINVAL; 1927 1928 if (!validate_add_rxsc(tb_rxsc)) 1929 return -EINVAL; 1930 1931 rtnl_lock(); 1932 dev = get_dev_from_nl(genl_info_net(info), attrs); 1933 if (IS_ERR(dev)) { 1934 rtnl_unlock(); 1935 return PTR_ERR(dev); 1936 } 1937 1938 secy = &macsec_priv(dev)->secy; 1939 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1940 1941 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1942 active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1943 1944 rx_sc = create_rx_sc(dev, sci, active); 1945 if (IS_ERR(rx_sc)) { 1946 rtnl_unlock(); 1947 return PTR_ERR(rx_sc); 1948 } 1949 1950 if (macsec_is_offloaded(netdev_priv(dev))) { 1951 const struct macsec_ops *ops; 1952 struct macsec_context ctx; 1953 1954 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1955 if (!ops) { 1956 ret = -EOPNOTSUPP; 1957 goto cleanup; 1958 } 1959 1960 ctx.rx_sc = rx_sc; 1961 ctx.secy = secy; 1962 1963 ret = macsec_offload(ops->mdo_add_rxsc, &ctx); 1964 if (ret) 1965 goto cleanup; 1966 } 1967 1968 rtnl_unlock(); 1969 1970 return 0; 1971 1972 cleanup: 1973 del_rx_sc(secy, sci); 1974 free_rx_sc(rx_sc); 1975 rtnl_unlock(); 1976 return ret; 1977 } 1978 1979 static bool validate_add_txsa(struct nlattr **attrs) 1980 { 1981 if (!attrs[MACSEC_SA_ATTR_AN] || 1982 !attrs[MACSEC_SA_ATTR_PN] || 1983 !attrs[MACSEC_SA_ATTR_KEY] || 1984 !attrs[MACSEC_SA_ATTR_KEYID]) 1985 return false; 1986 1987 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1988 return false; 1989 1990 if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 1991 return false; 1992 1993 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1994 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1995 return false; 1996 } 1997 1998 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1999 return false; 2000 2001 return true; 2002 } 2003 2004 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 2005 { 2006 struct net_device *dev; 2007 struct nlattr **attrs = info->attrs; 2008 struct macsec_secy *secy; 2009 struct macsec_tx_sc *tx_sc; 2010 struct macsec_tx_sa *tx_sa; 2011 unsigned char assoc_num; 2012 int pn_len; 2013 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2014 bool was_operational; 2015 int err; 2016 2017 if (!attrs[MACSEC_ATTR_IFINDEX]) 2018 return -EINVAL; 2019 2020 if (parse_sa_config(attrs, tb_sa)) 2021 return -EINVAL; 2022 2023 if (!validate_add_txsa(tb_sa)) 2024 return -EINVAL; 2025 2026 rtnl_lock(); 2027 dev = get_dev_from_nl(genl_info_net(info), attrs); 2028 if (IS_ERR(dev)) { 2029 rtnl_unlock(); 2030 return PTR_ERR(dev); 2031 } 2032 2033 secy = &macsec_priv(dev)->secy; 2034 tx_sc = &secy->tx_sc; 2035 2036 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 2037 2038 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 2039 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 2040 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 2041 rtnl_unlock(); 2042 return -EINVAL; 2043 } 2044 2045 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2046 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2047 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n", 2048 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2049 rtnl_unlock(); 2050 return -EINVAL; 2051 } 2052 2053 if (secy->xpn) { 2054 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 2055 rtnl_unlock(); 2056 return -EINVAL; 2057 } 2058 2059 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 2060 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n", 2061 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 2062 MACSEC_SALT_LEN); 2063 rtnl_unlock(); 2064 return -EINVAL; 2065 } 2066 } 2067 2068 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 2069 if (tx_sa) { 2070 rtnl_unlock(); 2071 return -EBUSY; 2072 } 2073 2074 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 2075 if (!tx_sa) { 2076 rtnl_unlock(); 2077 return -ENOMEM; 2078 } 2079 2080 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2081 secy->key_len, secy->icv_len); 2082 if (err < 0) { 2083 kfree(tx_sa); 2084 rtnl_unlock(); 2085 return err; 2086 } 2087 2088 spin_lock_bh(&tx_sa->lock); 2089 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2090 spin_unlock_bh(&tx_sa->lock); 2091 2092 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2093 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2094 2095 was_operational = secy->operational; 2096 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 2097 secy->operational = true; 2098 2099 if (secy->xpn) { 2100 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 2101 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 2102 MACSEC_SALT_LEN); 2103 } 2104 2105 /* If h/w offloading is available, propagate to the device */ 2106 if (macsec_is_offloaded(netdev_priv(dev))) { 2107 const struct macsec_ops *ops; 2108 struct macsec_context ctx; 2109 2110 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2111 if (!ops) { 2112 err = -EOPNOTSUPP; 2113 goto cleanup; 2114 } 2115 2116 ctx.sa.assoc_num = assoc_num; 2117 ctx.sa.tx_sa = tx_sa; 2118 ctx.secy = secy; 2119 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2120 secy->key_len); 2121 2122 err = macsec_offload(ops->mdo_add_txsa, &ctx); 2123 memzero_explicit(ctx.sa.key, secy->key_len); 2124 if (err) 2125 goto cleanup; 2126 } 2127 2128 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 2129 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 2130 2131 rtnl_unlock(); 2132 2133 return 0; 2134 2135 cleanup: 2136 secy->operational = was_operational; 2137 macsec_txsa_put(tx_sa); 2138 rtnl_unlock(); 2139 return err; 2140 } 2141 2142 static int macsec_del_rxsa(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 struct macsec_rx_sa *rx_sa; 2149 u8 assoc_num; 2150 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2151 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2152 int ret; 2153 2154 if (!attrs[MACSEC_ATTR_IFINDEX]) 2155 return -EINVAL; 2156 2157 if (parse_sa_config(attrs, tb_sa)) 2158 return -EINVAL; 2159 2160 if (parse_rxsc_config(attrs, tb_rxsc)) 2161 return -EINVAL; 2162 2163 rtnl_lock(); 2164 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2165 &dev, &secy, &rx_sc, &assoc_num); 2166 if (IS_ERR(rx_sa)) { 2167 rtnl_unlock(); 2168 return PTR_ERR(rx_sa); 2169 } 2170 2171 if (rx_sa->active) { 2172 rtnl_unlock(); 2173 return -EBUSY; 2174 } 2175 2176 /* If h/w offloading is available, propagate to the device */ 2177 if (macsec_is_offloaded(netdev_priv(dev))) { 2178 const struct macsec_ops *ops; 2179 struct macsec_context ctx; 2180 2181 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2182 if (!ops) { 2183 ret = -EOPNOTSUPP; 2184 goto cleanup; 2185 } 2186 2187 ctx.sa.assoc_num = assoc_num; 2188 ctx.sa.rx_sa = rx_sa; 2189 ctx.secy = secy; 2190 2191 ret = macsec_offload(ops->mdo_del_rxsa, &ctx); 2192 if (ret) 2193 goto cleanup; 2194 } 2195 2196 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 2197 clear_rx_sa(rx_sa); 2198 2199 rtnl_unlock(); 2200 2201 return 0; 2202 2203 cleanup: 2204 rtnl_unlock(); 2205 return ret; 2206 } 2207 2208 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 2209 { 2210 struct nlattr **attrs = info->attrs; 2211 struct net_device *dev; 2212 struct macsec_secy *secy; 2213 struct macsec_rx_sc *rx_sc; 2214 sci_t sci; 2215 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2216 int ret; 2217 2218 if (!attrs[MACSEC_ATTR_IFINDEX]) 2219 return -EINVAL; 2220 2221 if (parse_rxsc_config(attrs, tb_rxsc)) 2222 return -EINVAL; 2223 2224 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 2225 return -EINVAL; 2226 2227 rtnl_lock(); 2228 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 2229 if (IS_ERR(dev)) { 2230 rtnl_unlock(); 2231 return PTR_ERR(dev); 2232 } 2233 2234 secy = &macsec_priv(dev)->secy; 2235 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 2236 2237 rx_sc = del_rx_sc(secy, sci); 2238 if (!rx_sc) { 2239 rtnl_unlock(); 2240 return -ENODEV; 2241 } 2242 2243 /* If h/w offloading is available, propagate to the device */ 2244 if (macsec_is_offloaded(netdev_priv(dev))) { 2245 const struct macsec_ops *ops; 2246 struct macsec_context ctx; 2247 2248 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2249 if (!ops) { 2250 ret = -EOPNOTSUPP; 2251 goto cleanup; 2252 } 2253 2254 ctx.rx_sc = rx_sc; 2255 ctx.secy = secy; 2256 ret = macsec_offload(ops->mdo_del_rxsc, &ctx); 2257 if (ret) 2258 goto cleanup; 2259 } 2260 2261 free_rx_sc(rx_sc); 2262 rtnl_unlock(); 2263 2264 return 0; 2265 2266 cleanup: 2267 rtnl_unlock(); 2268 return ret; 2269 } 2270 2271 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 2272 { 2273 struct nlattr **attrs = info->attrs; 2274 struct net_device *dev; 2275 struct macsec_secy *secy; 2276 struct macsec_tx_sc *tx_sc; 2277 struct macsec_tx_sa *tx_sa; 2278 u8 assoc_num; 2279 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2280 int ret; 2281 2282 if (!attrs[MACSEC_ATTR_IFINDEX]) 2283 return -EINVAL; 2284 2285 if (parse_sa_config(attrs, tb_sa)) 2286 return -EINVAL; 2287 2288 rtnl_lock(); 2289 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2290 &dev, &secy, &tx_sc, &assoc_num); 2291 if (IS_ERR(tx_sa)) { 2292 rtnl_unlock(); 2293 return PTR_ERR(tx_sa); 2294 } 2295 2296 if (tx_sa->active) { 2297 rtnl_unlock(); 2298 return -EBUSY; 2299 } 2300 2301 /* If h/w offloading is available, propagate to the device */ 2302 if (macsec_is_offloaded(netdev_priv(dev))) { 2303 const struct macsec_ops *ops; 2304 struct macsec_context ctx; 2305 2306 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2307 if (!ops) { 2308 ret = -EOPNOTSUPP; 2309 goto cleanup; 2310 } 2311 2312 ctx.sa.assoc_num = assoc_num; 2313 ctx.sa.tx_sa = tx_sa; 2314 ctx.secy = secy; 2315 2316 ret = macsec_offload(ops->mdo_del_txsa, &ctx); 2317 if (ret) 2318 goto cleanup; 2319 } 2320 2321 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 2322 clear_tx_sa(tx_sa); 2323 2324 rtnl_unlock(); 2325 2326 return 0; 2327 2328 cleanup: 2329 rtnl_unlock(); 2330 return ret; 2331 } 2332 2333 static bool validate_upd_sa(struct nlattr **attrs) 2334 { 2335 if (!attrs[MACSEC_SA_ATTR_AN] || 2336 attrs[MACSEC_SA_ATTR_KEY] || 2337 attrs[MACSEC_SA_ATTR_KEYID] || 2338 attrs[MACSEC_SA_ATTR_SSCI] || 2339 attrs[MACSEC_SA_ATTR_SALT]) 2340 return false; 2341 2342 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 2343 return false; 2344 2345 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 2346 return false; 2347 2348 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 2349 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 2350 return false; 2351 } 2352 2353 return true; 2354 } 2355 2356 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2357 { 2358 struct nlattr **attrs = info->attrs; 2359 struct net_device *dev; 2360 struct macsec_secy *secy; 2361 struct macsec_tx_sc *tx_sc; 2362 struct macsec_tx_sa *tx_sa; 2363 u8 assoc_num; 2364 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2365 bool was_operational, was_active; 2366 pn_t prev_pn; 2367 int ret = 0; 2368 2369 prev_pn.full64 = 0; 2370 2371 if (!attrs[MACSEC_ATTR_IFINDEX]) 2372 return -EINVAL; 2373 2374 if (parse_sa_config(attrs, tb_sa)) 2375 return -EINVAL; 2376 2377 if (!validate_upd_sa(tb_sa)) 2378 return -EINVAL; 2379 2380 rtnl_lock(); 2381 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2382 &dev, &secy, &tx_sc, &assoc_num); 2383 if (IS_ERR(tx_sa)) { 2384 rtnl_unlock(); 2385 return PTR_ERR(tx_sa); 2386 } 2387 2388 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2389 int pn_len; 2390 2391 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2392 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2393 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n", 2394 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2395 rtnl_unlock(); 2396 return -EINVAL; 2397 } 2398 2399 spin_lock_bh(&tx_sa->lock); 2400 prev_pn = tx_sa->next_pn_halves; 2401 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2402 spin_unlock_bh(&tx_sa->lock); 2403 } 2404 2405 was_active = tx_sa->active; 2406 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2407 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2408 2409 was_operational = secy->operational; 2410 if (assoc_num == tx_sc->encoding_sa) 2411 secy->operational = tx_sa->active; 2412 2413 /* If h/w offloading is available, propagate to the device */ 2414 if (macsec_is_offloaded(netdev_priv(dev))) { 2415 const struct macsec_ops *ops; 2416 struct macsec_context ctx; 2417 2418 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2419 if (!ops) { 2420 ret = -EOPNOTSUPP; 2421 goto cleanup; 2422 } 2423 2424 ctx.sa.assoc_num = assoc_num; 2425 ctx.sa.tx_sa = tx_sa; 2426 ctx.sa.update_pn = !!prev_pn.full64; 2427 ctx.secy = secy; 2428 2429 ret = macsec_offload(ops->mdo_upd_txsa, &ctx); 2430 if (ret) 2431 goto cleanup; 2432 } 2433 2434 rtnl_unlock(); 2435 2436 return 0; 2437 2438 cleanup: 2439 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2440 spin_lock_bh(&tx_sa->lock); 2441 tx_sa->next_pn_halves = prev_pn; 2442 spin_unlock_bh(&tx_sa->lock); 2443 } 2444 tx_sa->active = was_active; 2445 secy->operational = was_operational; 2446 rtnl_unlock(); 2447 return ret; 2448 } 2449 2450 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2451 { 2452 struct nlattr **attrs = info->attrs; 2453 struct net_device *dev; 2454 struct macsec_secy *secy; 2455 struct macsec_rx_sc *rx_sc; 2456 struct macsec_rx_sa *rx_sa; 2457 u8 assoc_num; 2458 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2459 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2460 bool was_active; 2461 pn_t prev_pn; 2462 int ret = 0; 2463 2464 prev_pn.full64 = 0; 2465 2466 if (!attrs[MACSEC_ATTR_IFINDEX]) 2467 return -EINVAL; 2468 2469 if (parse_rxsc_config(attrs, tb_rxsc)) 2470 return -EINVAL; 2471 2472 if (parse_sa_config(attrs, tb_sa)) 2473 return -EINVAL; 2474 2475 if (!validate_upd_sa(tb_sa)) 2476 return -EINVAL; 2477 2478 rtnl_lock(); 2479 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2480 &dev, &secy, &rx_sc, &assoc_num); 2481 if (IS_ERR(rx_sa)) { 2482 rtnl_unlock(); 2483 return PTR_ERR(rx_sa); 2484 } 2485 2486 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2487 int pn_len; 2488 2489 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2490 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2491 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n", 2492 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2493 rtnl_unlock(); 2494 return -EINVAL; 2495 } 2496 2497 spin_lock_bh(&rx_sa->lock); 2498 prev_pn = rx_sa->next_pn_halves; 2499 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2500 spin_unlock_bh(&rx_sa->lock); 2501 } 2502 2503 was_active = rx_sa->active; 2504 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2505 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2506 2507 /* If h/w offloading is available, propagate to the device */ 2508 if (macsec_is_offloaded(netdev_priv(dev))) { 2509 const struct macsec_ops *ops; 2510 struct macsec_context ctx; 2511 2512 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2513 if (!ops) { 2514 ret = -EOPNOTSUPP; 2515 goto cleanup; 2516 } 2517 2518 ctx.sa.assoc_num = assoc_num; 2519 ctx.sa.rx_sa = rx_sa; 2520 ctx.sa.update_pn = !!prev_pn.full64; 2521 ctx.secy = secy; 2522 2523 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx); 2524 if (ret) 2525 goto cleanup; 2526 } 2527 2528 rtnl_unlock(); 2529 return 0; 2530 2531 cleanup: 2532 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2533 spin_lock_bh(&rx_sa->lock); 2534 rx_sa->next_pn_halves = prev_pn; 2535 spin_unlock_bh(&rx_sa->lock); 2536 } 2537 rx_sa->active = was_active; 2538 rtnl_unlock(); 2539 return ret; 2540 } 2541 2542 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2543 { 2544 struct nlattr **attrs = info->attrs; 2545 struct net_device *dev; 2546 struct macsec_secy *secy; 2547 struct macsec_rx_sc *rx_sc; 2548 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2549 unsigned int prev_n_rx_sc; 2550 bool was_active; 2551 int ret; 2552 2553 if (!attrs[MACSEC_ATTR_IFINDEX]) 2554 return -EINVAL; 2555 2556 if (parse_rxsc_config(attrs, tb_rxsc)) 2557 return -EINVAL; 2558 2559 if (!validate_add_rxsc(tb_rxsc)) 2560 return -EINVAL; 2561 2562 rtnl_lock(); 2563 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2564 if (IS_ERR(rx_sc)) { 2565 rtnl_unlock(); 2566 return PTR_ERR(rx_sc); 2567 } 2568 2569 was_active = rx_sc->active; 2570 prev_n_rx_sc = secy->n_rx_sc; 2571 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2572 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2573 2574 if (rx_sc->active != new) 2575 secy->n_rx_sc += new ? 1 : -1; 2576 2577 rx_sc->active = new; 2578 } 2579 2580 /* If h/w offloading is available, propagate to the device */ 2581 if (macsec_is_offloaded(netdev_priv(dev))) { 2582 const struct macsec_ops *ops; 2583 struct macsec_context ctx; 2584 2585 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2586 if (!ops) { 2587 ret = -EOPNOTSUPP; 2588 goto cleanup; 2589 } 2590 2591 ctx.rx_sc = rx_sc; 2592 ctx.secy = secy; 2593 2594 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx); 2595 if (ret) 2596 goto cleanup; 2597 } 2598 2599 rtnl_unlock(); 2600 2601 return 0; 2602 2603 cleanup: 2604 secy->n_rx_sc = prev_n_rx_sc; 2605 rx_sc->active = was_active; 2606 rtnl_unlock(); 2607 return ret; 2608 } 2609 2610 static bool macsec_is_configured(struct macsec_dev *macsec) 2611 { 2612 struct macsec_secy *secy = &macsec->secy; 2613 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2614 int i; 2615 2616 if (secy->rx_sc) 2617 return true; 2618 2619 for (i = 0; i < MACSEC_NUM_AN; i++) 2620 if (tx_sc->sa[i]) 2621 return true; 2622 2623 return false; 2624 } 2625 2626 static bool macsec_needs_tx_tag(struct macsec_dev *macsec, 2627 const struct macsec_ops *ops) 2628 { 2629 return macsec->offload == MACSEC_OFFLOAD_PHY && 2630 ops->mdo_insert_tx_tag; 2631 } 2632 2633 static void macsec_set_head_tail_room(struct net_device *dev) 2634 { 2635 struct macsec_dev *macsec = macsec_priv(dev); 2636 struct net_device *real_dev = macsec->real_dev; 2637 int needed_headroom, needed_tailroom; 2638 const struct macsec_ops *ops; 2639 2640 ops = macsec_get_ops(macsec, NULL); 2641 if (ops) { 2642 needed_headroom = ops->needed_headroom; 2643 needed_tailroom = ops->needed_tailroom; 2644 } else { 2645 needed_headroom = MACSEC_NEEDED_HEADROOM; 2646 needed_tailroom = MACSEC_NEEDED_TAILROOM; 2647 } 2648 2649 dev->needed_headroom = real_dev->needed_headroom + needed_headroom; 2650 dev->needed_tailroom = real_dev->needed_tailroom + needed_tailroom; 2651 } 2652 2653 static void macsec_inherit_tso_max(struct net_device *dev) 2654 { 2655 struct macsec_dev *macsec = macsec_priv(dev); 2656 2657 /* if macsec is offloaded, we need to follow the lower 2658 * device's capabilities. otherwise, we can ignore them. 2659 */ 2660 if (macsec_is_offloaded(macsec)) 2661 netif_inherit_tso_max(dev, macsec->real_dev); 2662 } 2663 2664 static int macsec_update_offload(struct net_device *dev, enum macsec_offload offload) 2665 { 2666 enum macsec_offload prev_offload; 2667 const struct macsec_ops *ops; 2668 struct macsec_context ctx; 2669 struct macsec_dev *macsec; 2670 int ret = 0; 2671 2672 macsec = macsec_priv(dev); 2673 2674 /* Check if the offloading mode is supported by the underlying layers */ 2675 if (offload != MACSEC_OFFLOAD_OFF && 2676 !macsec_check_offload(offload, macsec)) 2677 return -EOPNOTSUPP; 2678 2679 /* Check if the net device is busy. */ 2680 if (netif_running(dev)) 2681 return -EBUSY; 2682 2683 /* Check if the device already has rules configured: we do not support 2684 * rules migration. 2685 */ 2686 if (macsec_is_configured(macsec)) 2687 return -EBUSY; 2688 2689 prev_offload = macsec->offload; 2690 2691 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload, 2692 macsec, &ctx); 2693 if (!ops) 2694 return -EOPNOTSUPP; 2695 2696 macsec->offload = offload; 2697 2698 ctx.secy = &macsec->secy; 2699 ret = offload == MACSEC_OFFLOAD_OFF ? macsec_offload(ops->mdo_del_secy, &ctx) 2700 : macsec_offload(ops->mdo_add_secy, &ctx); 2701 if (ret) { 2702 macsec->offload = prev_offload; 2703 return ret; 2704 } 2705 2706 macsec_set_head_tail_room(dev); 2707 macsec->insert_tx_tag = macsec_needs_tx_tag(macsec, ops); 2708 2709 macsec_inherit_tso_max(dev); 2710 2711 netdev_update_features(dev); 2712 2713 return ret; 2714 } 2715 2716 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info) 2717 { 2718 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1]; 2719 struct nlattr **attrs = info->attrs; 2720 enum macsec_offload offload; 2721 struct macsec_dev *macsec; 2722 struct net_device *dev; 2723 int ret = 0; 2724 2725 if (!attrs[MACSEC_ATTR_IFINDEX]) 2726 return -EINVAL; 2727 2728 if (!attrs[MACSEC_ATTR_OFFLOAD]) 2729 return -EINVAL; 2730 2731 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX, 2732 attrs[MACSEC_ATTR_OFFLOAD], 2733 macsec_genl_offload_policy, NULL)) 2734 return -EINVAL; 2735 2736 rtnl_lock(); 2737 2738 dev = get_dev_from_nl(genl_info_net(info), attrs); 2739 if (IS_ERR(dev)) { 2740 ret = PTR_ERR(dev); 2741 goto out; 2742 } 2743 macsec = macsec_priv(dev); 2744 2745 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) { 2746 ret = -EINVAL; 2747 goto out; 2748 } 2749 2750 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]); 2751 2752 if (macsec->offload != offload) 2753 ret = macsec_update_offload(dev, offload); 2754 out: 2755 rtnl_unlock(); 2756 return ret; 2757 } 2758 2759 static void get_tx_sa_stats(struct net_device *dev, int an, 2760 struct macsec_tx_sa *tx_sa, 2761 struct macsec_tx_sa_stats *sum) 2762 { 2763 struct macsec_dev *macsec = macsec_priv(dev); 2764 int cpu; 2765 2766 /* If h/w offloading is available, propagate to the device */ 2767 if (macsec_is_offloaded(macsec)) { 2768 const struct macsec_ops *ops; 2769 struct macsec_context ctx; 2770 2771 ops = macsec_get_ops(macsec, &ctx); 2772 if (ops) { 2773 ctx.sa.assoc_num = an; 2774 ctx.sa.tx_sa = tx_sa; 2775 ctx.stats.tx_sa_stats = sum; 2776 ctx.secy = &macsec_priv(dev)->secy; 2777 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx); 2778 } 2779 return; 2780 } 2781 2782 for_each_possible_cpu(cpu) { 2783 const struct macsec_tx_sa_stats *stats = 2784 per_cpu_ptr(tx_sa->stats, cpu); 2785 2786 sum->OutPktsProtected += stats->OutPktsProtected; 2787 sum->OutPktsEncrypted += stats->OutPktsEncrypted; 2788 } 2789 } 2790 2791 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum) 2792 { 2793 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, 2794 sum->OutPktsProtected) || 2795 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2796 sum->OutPktsEncrypted)) 2797 return -EMSGSIZE; 2798 2799 return 0; 2800 } 2801 2802 static void get_rx_sa_stats(struct net_device *dev, 2803 struct macsec_rx_sc *rx_sc, int an, 2804 struct macsec_rx_sa *rx_sa, 2805 struct macsec_rx_sa_stats *sum) 2806 { 2807 struct macsec_dev *macsec = macsec_priv(dev); 2808 int cpu; 2809 2810 /* If h/w offloading is available, propagate to the device */ 2811 if (macsec_is_offloaded(macsec)) { 2812 const struct macsec_ops *ops; 2813 struct macsec_context ctx; 2814 2815 ops = macsec_get_ops(macsec, &ctx); 2816 if (ops) { 2817 ctx.sa.assoc_num = an; 2818 ctx.sa.rx_sa = rx_sa; 2819 ctx.stats.rx_sa_stats = sum; 2820 ctx.secy = &macsec_priv(dev)->secy; 2821 ctx.rx_sc = rx_sc; 2822 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx); 2823 } 2824 return; 2825 } 2826 2827 for_each_possible_cpu(cpu) { 2828 const struct macsec_rx_sa_stats *stats = 2829 per_cpu_ptr(rx_sa->stats, cpu); 2830 2831 sum->InPktsOK += stats->InPktsOK; 2832 sum->InPktsInvalid += stats->InPktsInvalid; 2833 sum->InPktsNotValid += stats->InPktsNotValid; 2834 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA; 2835 sum->InPktsUnusedSA += stats->InPktsUnusedSA; 2836 } 2837 } 2838 2839 static int copy_rx_sa_stats(struct sk_buff *skb, 2840 struct macsec_rx_sa_stats *sum) 2841 { 2842 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) || 2843 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, 2844 sum->InPktsInvalid) || 2845 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, 2846 sum->InPktsNotValid) || 2847 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2848 sum->InPktsNotUsingSA) || 2849 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, 2850 sum->InPktsUnusedSA)) 2851 return -EMSGSIZE; 2852 2853 return 0; 2854 } 2855 2856 static void get_rx_sc_stats(struct net_device *dev, 2857 struct macsec_rx_sc *rx_sc, 2858 struct macsec_rx_sc_stats *sum) 2859 { 2860 struct macsec_dev *macsec = macsec_priv(dev); 2861 int cpu; 2862 2863 /* If h/w offloading is available, propagate to the device */ 2864 if (macsec_is_offloaded(macsec)) { 2865 const struct macsec_ops *ops; 2866 struct macsec_context ctx; 2867 2868 ops = macsec_get_ops(macsec, &ctx); 2869 if (ops) { 2870 ctx.stats.rx_sc_stats = sum; 2871 ctx.secy = &macsec_priv(dev)->secy; 2872 ctx.rx_sc = rx_sc; 2873 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx); 2874 } 2875 return; 2876 } 2877 2878 for_each_possible_cpu(cpu) { 2879 const struct pcpu_rx_sc_stats *stats; 2880 struct macsec_rx_sc_stats tmp; 2881 unsigned int start; 2882 2883 stats = per_cpu_ptr(rx_sc->stats, cpu); 2884 do { 2885 start = u64_stats_fetch_begin(&stats->syncp); 2886 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2887 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2888 2889 sum->InOctetsValidated += tmp.InOctetsValidated; 2890 sum->InOctetsDecrypted += tmp.InOctetsDecrypted; 2891 sum->InPktsUnchecked += tmp.InPktsUnchecked; 2892 sum->InPktsDelayed += tmp.InPktsDelayed; 2893 sum->InPktsOK += tmp.InPktsOK; 2894 sum->InPktsInvalid += tmp.InPktsInvalid; 2895 sum->InPktsLate += tmp.InPktsLate; 2896 sum->InPktsNotValid += tmp.InPktsNotValid; 2897 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2898 sum->InPktsUnusedSA += tmp.InPktsUnusedSA; 2899 } 2900 } 2901 2902 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum) 2903 { 2904 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2905 sum->InOctetsValidated, 2906 MACSEC_RXSC_STATS_ATTR_PAD) || 2907 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2908 sum->InOctetsDecrypted, 2909 MACSEC_RXSC_STATS_ATTR_PAD) || 2910 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2911 sum->InPktsUnchecked, 2912 MACSEC_RXSC_STATS_ATTR_PAD) || 2913 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2914 sum->InPktsDelayed, 2915 MACSEC_RXSC_STATS_ATTR_PAD) || 2916 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2917 sum->InPktsOK, 2918 MACSEC_RXSC_STATS_ATTR_PAD) || 2919 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2920 sum->InPktsInvalid, 2921 MACSEC_RXSC_STATS_ATTR_PAD) || 2922 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2923 sum->InPktsLate, 2924 MACSEC_RXSC_STATS_ATTR_PAD) || 2925 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2926 sum->InPktsNotValid, 2927 MACSEC_RXSC_STATS_ATTR_PAD) || 2928 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2929 sum->InPktsNotUsingSA, 2930 MACSEC_RXSC_STATS_ATTR_PAD) || 2931 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2932 sum->InPktsUnusedSA, 2933 MACSEC_RXSC_STATS_ATTR_PAD)) 2934 return -EMSGSIZE; 2935 2936 return 0; 2937 } 2938 2939 static void get_tx_sc_stats(struct net_device *dev, 2940 struct macsec_tx_sc_stats *sum) 2941 { 2942 struct macsec_dev *macsec = macsec_priv(dev); 2943 int cpu; 2944 2945 /* If h/w offloading is available, propagate to the device */ 2946 if (macsec_is_offloaded(macsec)) { 2947 const struct macsec_ops *ops; 2948 struct macsec_context ctx; 2949 2950 ops = macsec_get_ops(macsec, &ctx); 2951 if (ops) { 2952 ctx.stats.tx_sc_stats = sum; 2953 ctx.secy = &macsec_priv(dev)->secy; 2954 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx); 2955 } 2956 return; 2957 } 2958 2959 for_each_possible_cpu(cpu) { 2960 const struct pcpu_tx_sc_stats *stats; 2961 struct macsec_tx_sc_stats tmp; 2962 unsigned int start; 2963 2964 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu); 2965 do { 2966 start = u64_stats_fetch_begin(&stats->syncp); 2967 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2968 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2969 2970 sum->OutPktsProtected += tmp.OutPktsProtected; 2971 sum->OutPktsEncrypted += tmp.OutPktsEncrypted; 2972 sum->OutOctetsProtected += tmp.OutOctetsProtected; 2973 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2974 } 2975 } 2976 2977 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum) 2978 { 2979 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2980 sum->OutPktsProtected, 2981 MACSEC_TXSC_STATS_ATTR_PAD) || 2982 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2983 sum->OutPktsEncrypted, 2984 MACSEC_TXSC_STATS_ATTR_PAD) || 2985 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2986 sum->OutOctetsProtected, 2987 MACSEC_TXSC_STATS_ATTR_PAD) || 2988 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2989 sum->OutOctetsEncrypted, 2990 MACSEC_TXSC_STATS_ATTR_PAD)) 2991 return -EMSGSIZE; 2992 2993 return 0; 2994 } 2995 2996 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum) 2997 { 2998 struct macsec_dev *macsec = macsec_priv(dev); 2999 int cpu; 3000 3001 /* If h/w offloading is available, propagate to the device */ 3002 if (macsec_is_offloaded(macsec)) { 3003 const struct macsec_ops *ops; 3004 struct macsec_context ctx; 3005 3006 ops = macsec_get_ops(macsec, &ctx); 3007 if (ops) { 3008 ctx.stats.dev_stats = sum; 3009 ctx.secy = &macsec_priv(dev)->secy; 3010 macsec_offload(ops->mdo_get_dev_stats, &ctx); 3011 } 3012 return; 3013 } 3014 3015 for_each_possible_cpu(cpu) { 3016 const struct pcpu_secy_stats *stats; 3017 struct macsec_dev_stats tmp; 3018 unsigned int start; 3019 3020 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu); 3021 do { 3022 start = u64_stats_fetch_begin(&stats->syncp); 3023 memcpy(&tmp, &stats->stats, sizeof(tmp)); 3024 } while (u64_stats_fetch_retry(&stats->syncp, start)); 3025 3026 sum->OutPktsUntagged += tmp.OutPktsUntagged; 3027 sum->InPktsUntagged += tmp.InPktsUntagged; 3028 sum->OutPktsTooLong += tmp.OutPktsTooLong; 3029 sum->InPktsNoTag += tmp.InPktsNoTag; 3030 sum->InPktsBadTag += tmp.InPktsBadTag; 3031 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI; 3032 sum->InPktsNoSCI += tmp.InPktsNoSCI; 3033 sum->InPktsOverrun += tmp.InPktsOverrun; 3034 } 3035 } 3036 3037 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum) 3038 { 3039 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 3040 sum->OutPktsUntagged, 3041 MACSEC_SECY_STATS_ATTR_PAD) || 3042 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 3043 sum->InPktsUntagged, 3044 MACSEC_SECY_STATS_ATTR_PAD) || 3045 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 3046 sum->OutPktsTooLong, 3047 MACSEC_SECY_STATS_ATTR_PAD) || 3048 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 3049 sum->InPktsNoTag, 3050 MACSEC_SECY_STATS_ATTR_PAD) || 3051 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 3052 sum->InPktsBadTag, 3053 MACSEC_SECY_STATS_ATTR_PAD) || 3054 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 3055 sum->InPktsUnknownSCI, 3056 MACSEC_SECY_STATS_ATTR_PAD) || 3057 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 3058 sum->InPktsNoSCI, 3059 MACSEC_SECY_STATS_ATTR_PAD) || 3060 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 3061 sum->InPktsOverrun, 3062 MACSEC_SECY_STATS_ATTR_PAD)) 3063 return -EMSGSIZE; 3064 3065 return 0; 3066 } 3067 3068 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 3069 { 3070 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3071 struct nlattr *secy_nest = nla_nest_start_noflag(skb, 3072 MACSEC_ATTR_SECY); 3073 u64 csid; 3074 3075 if (!secy_nest) 3076 return 1; 3077 3078 switch (secy->key_len) { 3079 case MACSEC_GCM_AES_128_SAK_LEN: 3080 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 3081 break; 3082 case MACSEC_GCM_AES_256_SAK_LEN: 3083 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 3084 break; 3085 default: 3086 goto cancel; 3087 } 3088 3089 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 3090 MACSEC_SECY_ATTR_PAD) || 3091 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 3092 csid, MACSEC_SECY_ATTR_PAD) || 3093 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 3094 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 3095 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 3096 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 3097 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 3098 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 3099 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 3100 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 3101 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 3102 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 3103 goto cancel; 3104 3105 if (secy->replay_protect) { 3106 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 3107 goto cancel; 3108 } 3109 3110 nla_nest_end(skb, secy_nest); 3111 return 0; 3112 3113 cancel: 3114 nla_nest_cancel(skb, secy_nest); 3115 return 1; 3116 } 3117 3118 static noinline_for_stack int 3119 dump_secy(struct macsec_secy *secy, struct net_device *dev, 3120 struct sk_buff *skb, struct netlink_callback *cb) 3121 { 3122 struct macsec_tx_sc_stats tx_sc_stats = {0, }; 3123 struct macsec_tx_sa_stats tx_sa_stats = {0, }; 3124 struct macsec_rx_sc_stats rx_sc_stats = {0, }; 3125 struct macsec_rx_sa_stats rx_sa_stats = {0, }; 3126 struct macsec_dev *macsec = netdev_priv(dev); 3127 struct macsec_dev_stats dev_stats = {0, }; 3128 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3129 struct nlattr *txsa_list, *rxsc_list; 3130 struct macsec_rx_sc *rx_sc; 3131 struct nlattr *attr; 3132 void *hdr; 3133 int i, j; 3134 3135 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3136 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 3137 if (!hdr) 3138 return -EMSGSIZE; 3139 3140 genl_dump_check_consistent(cb, hdr); 3141 3142 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 3143 goto nla_put_failure; 3144 3145 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD); 3146 if (!attr) 3147 goto nla_put_failure; 3148 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload)) 3149 goto nla_put_failure; 3150 nla_nest_end(skb, attr); 3151 3152 if (nla_put_secy(secy, skb)) 3153 goto nla_put_failure; 3154 3155 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS); 3156 if (!attr) 3157 goto nla_put_failure; 3158 3159 get_tx_sc_stats(dev, &tx_sc_stats); 3160 if (copy_tx_sc_stats(skb, &tx_sc_stats)) { 3161 nla_nest_cancel(skb, attr); 3162 goto nla_put_failure; 3163 } 3164 nla_nest_end(skb, attr); 3165 3166 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS); 3167 if (!attr) 3168 goto nla_put_failure; 3169 get_secy_stats(dev, &dev_stats); 3170 if (copy_secy_stats(skb, &dev_stats)) { 3171 nla_nest_cancel(skb, attr); 3172 goto nla_put_failure; 3173 } 3174 nla_nest_end(skb, attr); 3175 3176 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST); 3177 if (!txsa_list) 3178 goto nla_put_failure; 3179 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 3180 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 3181 struct nlattr *txsa_nest; 3182 u64 pn; 3183 int pn_len; 3184 3185 if (!tx_sa) 3186 continue; 3187 3188 txsa_nest = nla_nest_start_noflag(skb, j++); 3189 if (!txsa_nest) { 3190 nla_nest_cancel(skb, txsa_list); 3191 goto nla_put_failure; 3192 } 3193 3194 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS); 3195 if (!attr) { 3196 nla_nest_cancel(skb, txsa_nest); 3197 nla_nest_cancel(skb, txsa_list); 3198 goto nla_put_failure; 3199 } 3200 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats)); 3201 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats); 3202 if (copy_tx_sa_stats(skb, &tx_sa_stats)) { 3203 nla_nest_cancel(skb, attr); 3204 nla_nest_cancel(skb, txsa_nest); 3205 nla_nest_cancel(skb, txsa_list); 3206 goto nla_put_failure; 3207 } 3208 nla_nest_end(skb, attr); 3209 3210 if (secy->xpn) { 3211 pn = tx_sa->next_pn; 3212 pn_len = MACSEC_XPN_PN_LEN; 3213 } else { 3214 pn = tx_sa->next_pn_halves.lower; 3215 pn_len = MACSEC_DEFAULT_PN_LEN; 3216 } 3217 3218 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3219 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3220 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 3221 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) || 3222 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 3223 nla_nest_cancel(skb, txsa_nest); 3224 nla_nest_cancel(skb, txsa_list); 3225 goto nla_put_failure; 3226 } 3227 3228 nla_nest_end(skb, txsa_nest); 3229 } 3230 nla_nest_end(skb, txsa_list); 3231 3232 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST); 3233 if (!rxsc_list) 3234 goto nla_put_failure; 3235 3236 j = 1; 3237 for_each_rxsc_rtnl(secy, rx_sc) { 3238 int k; 3239 struct nlattr *rxsa_list; 3240 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++); 3241 3242 if (!rxsc_nest) { 3243 nla_nest_cancel(skb, rxsc_list); 3244 goto nla_put_failure; 3245 } 3246 3247 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 3248 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 3249 MACSEC_RXSC_ATTR_PAD)) { 3250 nla_nest_cancel(skb, rxsc_nest); 3251 nla_nest_cancel(skb, rxsc_list); 3252 goto nla_put_failure; 3253 } 3254 3255 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS); 3256 if (!attr) { 3257 nla_nest_cancel(skb, rxsc_nest); 3258 nla_nest_cancel(skb, rxsc_list); 3259 goto nla_put_failure; 3260 } 3261 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats)); 3262 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats); 3263 if (copy_rx_sc_stats(skb, &rx_sc_stats)) { 3264 nla_nest_cancel(skb, attr); 3265 nla_nest_cancel(skb, rxsc_nest); 3266 nla_nest_cancel(skb, rxsc_list); 3267 goto nla_put_failure; 3268 } 3269 nla_nest_end(skb, attr); 3270 3271 rxsa_list = nla_nest_start_noflag(skb, 3272 MACSEC_RXSC_ATTR_SA_LIST); 3273 if (!rxsa_list) { 3274 nla_nest_cancel(skb, rxsc_nest); 3275 nla_nest_cancel(skb, rxsc_list); 3276 goto nla_put_failure; 3277 } 3278 3279 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 3280 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 3281 struct nlattr *rxsa_nest; 3282 u64 pn; 3283 int pn_len; 3284 3285 if (!rx_sa) 3286 continue; 3287 3288 rxsa_nest = nla_nest_start_noflag(skb, k++); 3289 if (!rxsa_nest) { 3290 nla_nest_cancel(skb, rxsa_list); 3291 nla_nest_cancel(skb, rxsc_nest); 3292 nla_nest_cancel(skb, rxsc_list); 3293 goto nla_put_failure; 3294 } 3295 3296 attr = nla_nest_start_noflag(skb, 3297 MACSEC_SA_ATTR_STATS); 3298 if (!attr) { 3299 nla_nest_cancel(skb, rxsa_list); 3300 nla_nest_cancel(skb, rxsc_nest); 3301 nla_nest_cancel(skb, rxsc_list); 3302 goto nla_put_failure; 3303 } 3304 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats)); 3305 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats); 3306 if (copy_rx_sa_stats(skb, &rx_sa_stats)) { 3307 nla_nest_cancel(skb, attr); 3308 nla_nest_cancel(skb, rxsa_list); 3309 nla_nest_cancel(skb, rxsc_nest); 3310 nla_nest_cancel(skb, rxsc_list); 3311 goto nla_put_failure; 3312 } 3313 nla_nest_end(skb, attr); 3314 3315 if (secy->xpn) { 3316 pn = rx_sa->next_pn; 3317 pn_len = MACSEC_XPN_PN_LEN; 3318 } else { 3319 pn = rx_sa->next_pn_halves.lower; 3320 pn_len = MACSEC_DEFAULT_PN_LEN; 3321 } 3322 3323 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3324 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3325 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 3326 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) || 3327 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 3328 nla_nest_cancel(skb, rxsa_nest); 3329 nla_nest_cancel(skb, rxsc_nest); 3330 nla_nest_cancel(skb, rxsc_list); 3331 goto nla_put_failure; 3332 } 3333 nla_nest_end(skb, rxsa_nest); 3334 } 3335 3336 nla_nest_end(skb, rxsa_list); 3337 nla_nest_end(skb, rxsc_nest); 3338 } 3339 3340 nla_nest_end(skb, rxsc_list); 3341 3342 genlmsg_end(skb, hdr); 3343 3344 return 0; 3345 3346 nla_put_failure: 3347 genlmsg_cancel(skb, hdr); 3348 return -EMSGSIZE; 3349 } 3350 3351 static int macsec_generation = 1; /* protected by RTNL */ 3352 3353 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 3354 { 3355 struct net *net = sock_net(skb->sk); 3356 struct net_device *dev; 3357 int dev_idx, d; 3358 3359 dev_idx = cb->args[0]; 3360 3361 d = 0; 3362 rtnl_lock(); 3363 3364 cb->seq = macsec_generation; 3365 3366 for_each_netdev(net, dev) { 3367 struct macsec_secy *secy; 3368 3369 if (d < dev_idx) 3370 goto next; 3371 3372 if (!netif_is_macsec(dev)) 3373 goto next; 3374 3375 secy = &macsec_priv(dev)->secy; 3376 if (dump_secy(secy, dev, skb, cb) < 0) 3377 goto done; 3378 next: 3379 d++; 3380 } 3381 3382 done: 3383 rtnl_unlock(); 3384 cb->args[0] = d; 3385 return skb->len; 3386 } 3387 3388 static const struct genl_small_ops macsec_genl_ops[] = { 3389 { 3390 .cmd = MACSEC_CMD_GET_TXSC, 3391 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3392 .dumpit = macsec_dump_txsc, 3393 }, 3394 { 3395 .cmd = MACSEC_CMD_ADD_RXSC, 3396 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3397 .doit = macsec_add_rxsc, 3398 .flags = GENL_ADMIN_PERM, 3399 }, 3400 { 3401 .cmd = MACSEC_CMD_DEL_RXSC, 3402 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3403 .doit = macsec_del_rxsc, 3404 .flags = GENL_ADMIN_PERM, 3405 }, 3406 { 3407 .cmd = MACSEC_CMD_UPD_RXSC, 3408 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3409 .doit = macsec_upd_rxsc, 3410 .flags = GENL_ADMIN_PERM, 3411 }, 3412 { 3413 .cmd = MACSEC_CMD_ADD_TXSA, 3414 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3415 .doit = macsec_add_txsa, 3416 .flags = GENL_ADMIN_PERM, 3417 }, 3418 { 3419 .cmd = MACSEC_CMD_DEL_TXSA, 3420 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3421 .doit = macsec_del_txsa, 3422 .flags = GENL_ADMIN_PERM, 3423 }, 3424 { 3425 .cmd = MACSEC_CMD_UPD_TXSA, 3426 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3427 .doit = macsec_upd_txsa, 3428 .flags = GENL_ADMIN_PERM, 3429 }, 3430 { 3431 .cmd = MACSEC_CMD_ADD_RXSA, 3432 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3433 .doit = macsec_add_rxsa, 3434 .flags = GENL_ADMIN_PERM, 3435 }, 3436 { 3437 .cmd = MACSEC_CMD_DEL_RXSA, 3438 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3439 .doit = macsec_del_rxsa, 3440 .flags = GENL_ADMIN_PERM, 3441 }, 3442 { 3443 .cmd = MACSEC_CMD_UPD_RXSA, 3444 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3445 .doit = macsec_upd_rxsa, 3446 .flags = GENL_ADMIN_PERM, 3447 }, 3448 { 3449 .cmd = MACSEC_CMD_UPD_OFFLOAD, 3450 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3451 .doit = macsec_upd_offload, 3452 .flags = GENL_ADMIN_PERM, 3453 }, 3454 }; 3455 3456 static struct genl_family macsec_fam __ro_after_init = { 3457 .name = MACSEC_GENL_NAME, 3458 .hdrsize = 0, 3459 .version = MACSEC_GENL_VERSION, 3460 .maxattr = MACSEC_ATTR_MAX, 3461 .policy = macsec_genl_policy, 3462 .netnsok = true, 3463 .module = THIS_MODULE, 3464 .small_ops = macsec_genl_ops, 3465 .n_small_ops = ARRAY_SIZE(macsec_genl_ops), 3466 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1, 3467 }; 3468 3469 static struct sk_buff *macsec_insert_tx_tag(struct sk_buff *skb, 3470 struct net_device *dev) 3471 { 3472 struct macsec_dev *macsec = macsec_priv(dev); 3473 const struct macsec_ops *ops; 3474 struct phy_device *phydev; 3475 struct macsec_context ctx; 3476 int skb_final_len; 3477 int err; 3478 3479 ops = macsec_get_ops(macsec, &ctx); 3480 skb_final_len = skb->len - ETH_HLEN + ops->needed_headroom + 3481 ops->needed_tailroom; 3482 if (unlikely(skb_final_len > macsec->real_dev->mtu)) { 3483 err = -EINVAL; 3484 goto cleanup; 3485 } 3486 3487 phydev = macsec->real_dev->phydev; 3488 3489 err = skb_ensure_writable_head_tail(skb, dev); 3490 if (unlikely(err < 0)) 3491 goto cleanup; 3492 3493 err = ops->mdo_insert_tx_tag(phydev, skb); 3494 if (unlikely(err)) 3495 goto cleanup; 3496 3497 return skb; 3498 cleanup: 3499 kfree_skb(skb); 3500 return ERR_PTR(err); 3501 } 3502 3503 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 3504 struct net_device *dev) 3505 { 3506 struct macsec_dev *macsec = netdev_priv(dev); 3507 struct macsec_secy *secy = &macsec->secy; 3508 struct pcpu_secy_stats *secy_stats; 3509 int ret, len; 3510 3511 if (macsec_is_offloaded(netdev_priv(dev))) { 3512 struct metadata_dst *md_dst = secy->tx_sc.md_dst; 3513 3514 skb_dst_drop(skb); 3515 dst_hold(&md_dst->dst); 3516 skb_dst_set(skb, &md_dst->dst); 3517 3518 if (macsec->insert_tx_tag) { 3519 skb = macsec_insert_tx_tag(skb, dev); 3520 if (IS_ERR(skb)) { 3521 DEV_STATS_INC(dev, tx_dropped); 3522 return NETDEV_TX_OK; 3523 } 3524 } 3525 3526 skb->dev = macsec->real_dev; 3527 return dev_queue_xmit(skb); 3528 } 3529 3530 /* 10.5 */ 3531 if (!secy->protect_frames) { 3532 secy_stats = this_cpu_ptr(macsec->stats); 3533 u64_stats_update_begin(&secy_stats->syncp); 3534 secy_stats->stats.OutPktsUntagged++; 3535 u64_stats_update_end(&secy_stats->syncp); 3536 skb->dev = macsec->real_dev; 3537 len = skb->len; 3538 ret = dev_queue_xmit(skb); 3539 count_tx(dev, ret, len); 3540 return ret; 3541 } 3542 3543 if (!secy->operational) { 3544 kfree_skb(skb); 3545 DEV_STATS_INC(dev, tx_dropped); 3546 return NETDEV_TX_OK; 3547 } 3548 3549 len = skb->len; 3550 skb = macsec_encrypt(skb, dev); 3551 if (IS_ERR(skb)) { 3552 if (PTR_ERR(skb) != -EINPROGRESS) 3553 DEV_STATS_INC(dev, tx_dropped); 3554 return NETDEV_TX_OK; 3555 } 3556 3557 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 3558 3559 macsec_encrypt_finish(skb, dev); 3560 ret = dev_queue_xmit(skb); 3561 count_tx(dev, ret, len); 3562 return ret; 3563 } 3564 3565 #define MACSEC_FEATURES \ 3566 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 3567 3568 #define MACSEC_OFFLOAD_FEATURES \ 3569 (MACSEC_FEATURES | NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES | \ 3570 NETIF_F_LRO | NETIF_F_RXHASH | NETIF_F_CSUM_MASK | NETIF_F_RXCSUM) 3571 3572 static int macsec_dev_init(struct net_device *dev) 3573 { 3574 struct macsec_dev *macsec = macsec_priv(dev); 3575 struct net_device *real_dev = macsec->real_dev; 3576 int err; 3577 3578 err = gro_cells_init(&macsec->gro_cells, dev); 3579 if (err) 3580 return err; 3581 3582 macsec_inherit_tso_max(dev); 3583 3584 dev->hw_features = real_dev->hw_features & MACSEC_OFFLOAD_FEATURES; 3585 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 3586 3587 dev->features = real_dev->features & MACSEC_OFFLOAD_FEATURES; 3588 dev->features |= NETIF_F_GSO_SOFTWARE; 3589 dev->lltx = true; 3590 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 3591 3592 macsec_set_head_tail_room(dev); 3593 3594 if (is_zero_ether_addr(dev->dev_addr)) 3595 eth_hw_addr_inherit(dev, real_dev); 3596 if (is_zero_ether_addr(dev->broadcast)) 3597 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 3598 3599 /* Get macsec's reference to real_dev */ 3600 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL); 3601 3602 return 0; 3603 } 3604 3605 static void macsec_dev_uninit(struct net_device *dev) 3606 { 3607 struct macsec_dev *macsec = macsec_priv(dev); 3608 3609 gro_cells_destroy(&macsec->gro_cells); 3610 } 3611 3612 static netdev_features_t macsec_fix_features(struct net_device *dev, 3613 netdev_features_t features) 3614 { 3615 struct macsec_dev *macsec = macsec_priv(dev); 3616 struct net_device *real_dev = macsec->real_dev; 3617 netdev_features_t mask; 3618 3619 mask = macsec_is_offloaded(macsec) ? MACSEC_OFFLOAD_FEATURES 3620 : MACSEC_FEATURES; 3621 3622 features &= (real_dev->features & mask) | 3623 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 3624 3625 return features; 3626 } 3627 3628 static int macsec_dev_open(struct net_device *dev) 3629 { 3630 struct macsec_dev *macsec = macsec_priv(dev); 3631 struct net_device *real_dev = macsec->real_dev; 3632 int err; 3633 3634 err = dev_uc_add(real_dev, dev->dev_addr); 3635 if (err < 0) 3636 return err; 3637 3638 if (dev->flags & IFF_ALLMULTI) { 3639 err = dev_set_allmulti(real_dev, 1); 3640 if (err < 0) 3641 goto del_unicast; 3642 } 3643 3644 if (dev->flags & IFF_PROMISC) { 3645 err = dev_set_promiscuity(real_dev, 1); 3646 if (err < 0) 3647 goto clear_allmulti; 3648 } 3649 3650 /* If h/w offloading is available, propagate to the device */ 3651 if (macsec_is_offloaded(macsec)) { 3652 const struct macsec_ops *ops; 3653 struct macsec_context ctx; 3654 3655 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3656 if (!ops) { 3657 err = -EOPNOTSUPP; 3658 goto clear_allmulti; 3659 } 3660 3661 ctx.secy = &macsec->secy; 3662 err = macsec_offload(ops->mdo_dev_open, &ctx); 3663 if (err) 3664 goto clear_allmulti; 3665 } 3666 3667 if (netif_carrier_ok(real_dev)) 3668 netif_carrier_on(dev); 3669 3670 return 0; 3671 clear_allmulti: 3672 if (dev->flags & IFF_ALLMULTI) 3673 dev_set_allmulti(real_dev, -1); 3674 del_unicast: 3675 dev_uc_del(real_dev, dev->dev_addr); 3676 netif_carrier_off(dev); 3677 return err; 3678 } 3679 3680 static int macsec_dev_stop(struct net_device *dev) 3681 { 3682 struct macsec_dev *macsec = macsec_priv(dev); 3683 struct net_device *real_dev = macsec->real_dev; 3684 3685 netif_carrier_off(dev); 3686 3687 /* If h/w offloading is available, propagate to the device */ 3688 if (macsec_is_offloaded(macsec)) { 3689 const struct macsec_ops *ops; 3690 struct macsec_context ctx; 3691 3692 ops = macsec_get_ops(macsec, &ctx); 3693 if (ops) { 3694 ctx.secy = &macsec->secy; 3695 macsec_offload(ops->mdo_dev_stop, &ctx); 3696 } 3697 } 3698 3699 dev_mc_unsync(real_dev, dev); 3700 dev_uc_unsync(real_dev, dev); 3701 3702 if (dev->flags & IFF_ALLMULTI) 3703 dev_set_allmulti(real_dev, -1); 3704 3705 if (dev->flags & IFF_PROMISC) 3706 dev_set_promiscuity(real_dev, -1); 3707 3708 dev_uc_del(real_dev, dev->dev_addr); 3709 3710 return 0; 3711 } 3712 3713 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 3714 { 3715 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3716 3717 if (!(dev->flags & IFF_UP)) 3718 return; 3719 3720 if (change & IFF_ALLMULTI) 3721 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 3722 3723 if (change & IFF_PROMISC) 3724 dev_set_promiscuity(real_dev, 3725 dev->flags & IFF_PROMISC ? 1 : -1); 3726 } 3727 3728 static void macsec_dev_set_rx_mode(struct net_device *dev) 3729 { 3730 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3731 3732 dev_mc_sync(real_dev, dev); 3733 dev_uc_sync(real_dev, dev); 3734 } 3735 3736 static int macsec_set_mac_address(struct net_device *dev, void *p) 3737 { 3738 struct macsec_dev *macsec = macsec_priv(dev); 3739 struct net_device *real_dev = macsec->real_dev; 3740 struct sockaddr *addr = p; 3741 u8 old_addr[ETH_ALEN]; 3742 int err; 3743 3744 if (!is_valid_ether_addr(addr->sa_data)) 3745 return -EADDRNOTAVAIL; 3746 3747 if (dev->flags & IFF_UP) { 3748 err = dev_uc_add(real_dev, addr->sa_data); 3749 if (err < 0) 3750 return err; 3751 } 3752 3753 ether_addr_copy(old_addr, dev->dev_addr); 3754 eth_hw_addr_set(dev, addr->sa_data); 3755 3756 /* If h/w offloading is available, propagate to the device */ 3757 if (macsec_is_offloaded(macsec)) { 3758 const struct macsec_ops *ops; 3759 struct macsec_context ctx; 3760 3761 ops = macsec_get_ops(macsec, &ctx); 3762 if (!ops) { 3763 err = -EOPNOTSUPP; 3764 goto restore_old_addr; 3765 } 3766 3767 ctx.secy = &macsec->secy; 3768 err = macsec_offload(ops->mdo_upd_secy, &ctx); 3769 if (err) 3770 goto restore_old_addr; 3771 } 3772 3773 if (dev->flags & IFF_UP) 3774 dev_uc_del(real_dev, old_addr); 3775 3776 return 0; 3777 3778 restore_old_addr: 3779 if (dev->flags & IFF_UP) 3780 dev_uc_del(real_dev, addr->sa_data); 3781 3782 eth_hw_addr_set(dev, old_addr); 3783 3784 return err; 3785 } 3786 3787 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 3788 { 3789 struct macsec_dev *macsec = macsec_priv(dev); 3790 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 3791 3792 if (macsec->real_dev->mtu - extra < new_mtu) 3793 return -ERANGE; 3794 3795 WRITE_ONCE(dev->mtu, new_mtu); 3796 3797 return 0; 3798 } 3799 3800 static void macsec_get_stats64(struct net_device *dev, 3801 struct rtnl_link_stats64 *s) 3802 { 3803 if (!dev->tstats) 3804 return; 3805 3806 dev_fetch_sw_netstats(s, dev->tstats); 3807 3808 s->rx_dropped = DEV_STATS_READ(dev, rx_dropped); 3809 s->tx_dropped = DEV_STATS_READ(dev, tx_dropped); 3810 s->rx_errors = DEV_STATS_READ(dev, rx_errors); 3811 } 3812 3813 static int macsec_get_iflink(const struct net_device *dev) 3814 { 3815 return READ_ONCE(macsec_priv(dev)->real_dev->ifindex); 3816 } 3817 3818 static const struct net_device_ops macsec_netdev_ops = { 3819 .ndo_init = macsec_dev_init, 3820 .ndo_uninit = macsec_dev_uninit, 3821 .ndo_open = macsec_dev_open, 3822 .ndo_stop = macsec_dev_stop, 3823 .ndo_fix_features = macsec_fix_features, 3824 .ndo_change_mtu = macsec_change_mtu, 3825 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 3826 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 3827 .ndo_set_mac_address = macsec_set_mac_address, 3828 .ndo_start_xmit = macsec_start_xmit, 3829 .ndo_get_stats64 = macsec_get_stats64, 3830 .ndo_get_iflink = macsec_get_iflink, 3831 }; 3832 3833 static const struct device_type macsec_type = { 3834 .name = "macsec", 3835 }; 3836 3837 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 3838 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 3839 [IFLA_MACSEC_PORT] = { .type = NLA_U16 }, 3840 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 3841 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 3842 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 3843 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 3844 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 3845 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 3846 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 3847 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 3848 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 3849 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 3850 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 3851 [IFLA_MACSEC_OFFLOAD] = { .type = NLA_U8 }, 3852 }; 3853 3854 static void macsec_free_netdev(struct net_device *dev) 3855 { 3856 struct macsec_dev *macsec = macsec_priv(dev); 3857 3858 dst_release(&macsec->secy.tx_sc.md_dst->dst); 3859 free_percpu(macsec->stats); 3860 free_percpu(macsec->secy.tx_sc.stats); 3861 3862 /* Get rid of the macsec's reference to real_dev */ 3863 netdev_put(macsec->real_dev, &macsec->dev_tracker); 3864 } 3865 3866 static void macsec_setup(struct net_device *dev) 3867 { 3868 ether_setup(dev); 3869 dev->min_mtu = 0; 3870 dev->max_mtu = ETH_MAX_MTU; 3871 dev->priv_flags |= IFF_NO_QUEUE; 3872 dev->netdev_ops = &macsec_netdev_ops; 3873 dev->needs_free_netdev = true; 3874 dev->priv_destructor = macsec_free_netdev; 3875 SET_NETDEV_DEVTYPE(dev, &macsec_type); 3876 3877 eth_zero_addr(dev->broadcast); 3878 } 3879 3880 static int macsec_changelink_common(struct net_device *dev, 3881 struct nlattr *data[]) 3882 { 3883 struct macsec_secy *secy; 3884 struct macsec_tx_sc *tx_sc; 3885 3886 secy = &macsec_priv(dev)->secy; 3887 tx_sc = &secy->tx_sc; 3888 3889 if (data[IFLA_MACSEC_ENCODING_SA]) { 3890 struct macsec_tx_sa *tx_sa; 3891 3892 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3893 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 3894 3895 secy->operational = tx_sa && tx_sa->active; 3896 } 3897 3898 if (data[IFLA_MACSEC_ENCRYPT]) 3899 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3900 3901 if (data[IFLA_MACSEC_PROTECT]) 3902 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3903 3904 if (data[IFLA_MACSEC_INC_SCI]) 3905 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3906 3907 if (data[IFLA_MACSEC_ES]) 3908 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3909 3910 if (data[IFLA_MACSEC_SCB]) 3911 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3912 3913 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3914 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3915 3916 if (data[IFLA_MACSEC_VALIDATION]) 3917 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3918 3919 if (data[IFLA_MACSEC_CIPHER_SUITE]) { 3920 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) { 3921 case MACSEC_CIPHER_ID_GCM_AES_128: 3922 case MACSEC_DEFAULT_CIPHER_ID: 3923 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3924 secy->xpn = false; 3925 break; 3926 case MACSEC_CIPHER_ID_GCM_AES_256: 3927 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3928 secy->xpn = false; 3929 break; 3930 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 3931 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3932 secy->xpn = true; 3933 break; 3934 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 3935 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3936 secy->xpn = true; 3937 break; 3938 default: 3939 return -EINVAL; 3940 } 3941 } 3942 3943 if (data[IFLA_MACSEC_WINDOW]) { 3944 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3945 3946 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window 3947 * for XPN cipher suites */ 3948 if (secy->xpn && 3949 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW) 3950 return -EINVAL; 3951 } 3952 3953 return 0; 3954 } 3955 3956 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3957 struct nlattr *data[], 3958 struct netlink_ext_ack *extack) 3959 { 3960 struct macsec_dev *macsec = macsec_priv(dev); 3961 bool macsec_offload_state_change = false; 3962 enum macsec_offload offload; 3963 struct macsec_tx_sc tx_sc; 3964 struct macsec_secy secy; 3965 int ret; 3966 3967 if (!data) 3968 return 0; 3969 3970 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3971 data[IFLA_MACSEC_ICV_LEN] || 3972 data[IFLA_MACSEC_SCI] || 3973 data[IFLA_MACSEC_PORT]) 3974 return -EINVAL; 3975 3976 /* Keep a copy of unmodified secy and tx_sc, in case the offload 3977 * propagation fails, to revert macsec_changelink_common. 3978 */ 3979 memcpy(&secy, &macsec->secy, sizeof(secy)); 3980 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc)); 3981 3982 ret = macsec_changelink_common(dev, data); 3983 if (ret) 3984 goto cleanup; 3985 3986 if (data[IFLA_MACSEC_OFFLOAD]) { 3987 offload = nla_get_u8(data[IFLA_MACSEC_OFFLOAD]); 3988 if (macsec->offload != offload) { 3989 macsec_offload_state_change = true; 3990 ret = macsec_update_offload(dev, offload); 3991 if (ret) 3992 goto cleanup; 3993 } 3994 } 3995 3996 /* If h/w offloading is available, propagate to the device */ 3997 if (!macsec_offload_state_change && macsec_is_offloaded(macsec)) { 3998 const struct macsec_ops *ops; 3999 struct macsec_context ctx; 4000 4001 ops = macsec_get_ops(netdev_priv(dev), &ctx); 4002 if (!ops) { 4003 ret = -EOPNOTSUPP; 4004 goto cleanup; 4005 } 4006 4007 ctx.secy = &macsec->secy; 4008 ret = macsec_offload(ops->mdo_upd_secy, &ctx); 4009 if (ret) 4010 goto cleanup; 4011 } 4012 4013 return 0; 4014 4015 cleanup: 4016 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc)); 4017 memcpy(&macsec->secy, &secy, sizeof(secy)); 4018 4019 return ret; 4020 } 4021 4022 static void macsec_del_dev(struct macsec_dev *macsec) 4023 { 4024 int i; 4025 4026 while (macsec->secy.rx_sc) { 4027 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 4028 4029 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 4030 free_rx_sc(rx_sc); 4031 } 4032 4033 for (i = 0; i < MACSEC_NUM_AN; i++) { 4034 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 4035 4036 if (sa) { 4037 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 4038 clear_tx_sa(sa); 4039 } 4040 } 4041 } 4042 4043 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 4044 { 4045 struct macsec_dev *macsec = macsec_priv(dev); 4046 struct net_device *real_dev = macsec->real_dev; 4047 4048 /* If h/w offloading is available, propagate to the device */ 4049 if (macsec_is_offloaded(macsec)) { 4050 const struct macsec_ops *ops; 4051 struct macsec_context ctx; 4052 4053 ops = macsec_get_ops(netdev_priv(dev), &ctx); 4054 if (ops) { 4055 ctx.secy = &macsec->secy; 4056 macsec_offload(ops->mdo_del_secy, &ctx); 4057 } 4058 } 4059 4060 unregister_netdevice_queue(dev, head); 4061 list_del_rcu(&macsec->secys); 4062 macsec_del_dev(macsec); 4063 netdev_upper_dev_unlink(real_dev, dev); 4064 4065 macsec_generation++; 4066 } 4067 4068 static void macsec_dellink(struct net_device *dev, struct list_head *head) 4069 { 4070 struct macsec_dev *macsec = macsec_priv(dev); 4071 struct net_device *real_dev = macsec->real_dev; 4072 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 4073 4074 macsec_common_dellink(dev, head); 4075 4076 if (list_empty(&rxd->secys)) { 4077 netdev_rx_handler_unregister(real_dev); 4078 kfree(rxd); 4079 } 4080 } 4081 4082 static int register_macsec_dev(struct net_device *real_dev, 4083 struct net_device *dev) 4084 { 4085 struct macsec_dev *macsec = macsec_priv(dev); 4086 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 4087 4088 if (!rxd) { 4089 int err; 4090 4091 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 4092 if (!rxd) 4093 return -ENOMEM; 4094 4095 INIT_LIST_HEAD(&rxd->secys); 4096 4097 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 4098 rxd); 4099 if (err < 0) { 4100 kfree(rxd); 4101 return err; 4102 } 4103 } 4104 4105 list_add_tail_rcu(&macsec->secys, &rxd->secys); 4106 return 0; 4107 } 4108 4109 static bool sci_exists(struct net_device *dev, sci_t sci) 4110 { 4111 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 4112 struct macsec_dev *macsec; 4113 4114 list_for_each_entry(macsec, &rxd->secys, secys) { 4115 if (macsec->secy.sci == sci) 4116 return true; 4117 } 4118 4119 return false; 4120 } 4121 4122 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 4123 { 4124 return make_sci(dev->dev_addr, port); 4125 } 4126 4127 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 4128 { 4129 struct macsec_dev *macsec = macsec_priv(dev); 4130 struct macsec_secy *secy = &macsec->secy; 4131 4132 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 4133 if (!macsec->stats) 4134 return -ENOMEM; 4135 4136 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 4137 if (!secy->tx_sc.stats) 4138 return -ENOMEM; 4139 4140 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL); 4141 if (!secy->tx_sc.md_dst) 4142 /* macsec and secy percpu stats will be freed when unregistering 4143 * net_device in macsec_free_netdev() 4144 */ 4145 return -ENOMEM; 4146 4147 if (sci == MACSEC_UNDEF_SCI) 4148 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4149 4150 secy->netdev = dev; 4151 secy->operational = true; 4152 secy->key_len = DEFAULT_SAK_LEN; 4153 secy->icv_len = icv_len; 4154 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 4155 secy->protect_frames = true; 4156 secy->replay_protect = false; 4157 secy->xpn = DEFAULT_XPN; 4158 4159 secy->sci = sci; 4160 secy->tx_sc.md_dst->u.macsec_info.sci = sci; 4161 secy->tx_sc.active = true; 4162 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 4163 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 4164 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 4165 secy->tx_sc.end_station = false; 4166 secy->tx_sc.scb = false; 4167 4168 return 0; 4169 } 4170 4171 static struct lock_class_key macsec_netdev_addr_lock_key; 4172 4173 static int macsec_newlink(struct net_device *dev, 4174 struct rtnl_newlink_params *params, 4175 struct netlink_ext_ack *extack) 4176 { 4177 struct net *link_net = rtnl_newlink_link_net(params); 4178 struct macsec_dev *macsec = macsec_priv(dev); 4179 struct nlattr **data = params->data; 4180 struct nlattr **tb = params->tb; 4181 rx_handler_func_t *rx_handler; 4182 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4183 struct net_device *real_dev; 4184 int err, mtu; 4185 sci_t sci; 4186 4187 if (!tb[IFLA_LINK]) 4188 return -EINVAL; 4189 real_dev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK])); 4190 if (!real_dev) 4191 return -ENODEV; 4192 if (real_dev->type != ARPHRD_ETHER) 4193 return -EINVAL; 4194 4195 dev->priv_flags |= IFF_MACSEC; 4196 4197 macsec->real_dev = real_dev; 4198 4199 if (data && data[IFLA_MACSEC_OFFLOAD]) 4200 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]); 4201 else 4202 /* MACsec offloading is off by default */ 4203 macsec->offload = MACSEC_OFFLOAD_OFF; 4204 4205 /* Check if the offloading mode is supported by the underlying layers */ 4206 if (macsec->offload != MACSEC_OFFLOAD_OFF && 4207 !macsec_check_offload(macsec->offload, macsec)) 4208 return -EOPNOTSUPP; 4209 4210 /* send_sci must be set to true when transmit sci explicitly is set */ 4211 if ((data && data[IFLA_MACSEC_SCI]) && 4212 (data && data[IFLA_MACSEC_INC_SCI])) { 4213 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 4214 4215 if (!send_sci) 4216 return -EINVAL; 4217 } 4218 4219 if (data && data[IFLA_MACSEC_ICV_LEN]) 4220 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4221 mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 4222 if (mtu < 0) 4223 dev->mtu = 0; 4224 else 4225 dev->mtu = mtu; 4226 4227 rx_handler = rtnl_dereference(real_dev->rx_handler); 4228 if (rx_handler && rx_handler != macsec_handle_frame) 4229 return -EBUSY; 4230 4231 err = register_netdevice(dev); 4232 if (err < 0) 4233 return err; 4234 4235 netdev_lockdep_set_classes(dev); 4236 lockdep_set_class(&dev->addr_list_lock, 4237 &macsec_netdev_addr_lock_key); 4238 4239 err = netdev_upper_dev_link(real_dev, dev, extack); 4240 if (err < 0) 4241 goto unregister; 4242 4243 /* need to be already registered so that ->init has run and 4244 * the MAC addr is set 4245 */ 4246 if (data && data[IFLA_MACSEC_SCI]) 4247 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 4248 else if (data && data[IFLA_MACSEC_PORT]) 4249 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 4250 else 4251 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4252 4253 if (rx_handler && sci_exists(real_dev, sci)) { 4254 err = -EBUSY; 4255 goto unlink; 4256 } 4257 4258 err = macsec_add_dev(dev, sci, icv_len); 4259 if (err) 4260 goto unlink; 4261 4262 if (data) { 4263 err = macsec_changelink_common(dev, data); 4264 if (err) 4265 goto del_dev; 4266 } 4267 4268 /* If h/w offloading is available, propagate to the device */ 4269 if (macsec_is_offloaded(macsec)) { 4270 const struct macsec_ops *ops; 4271 struct macsec_context ctx; 4272 4273 ops = macsec_get_ops(macsec, &ctx); 4274 if (ops) { 4275 ctx.secy = &macsec->secy; 4276 err = macsec_offload(ops->mdo_add_secy, &ctx); 4277 if (err) 4278 goto del_dev; 4279 4280 macsec->insert_tx_tag = 4281 macsec_needs_tx_tag(macsec, ops); 4282 } 4283 } 4284 4285 err = register_macsec_dev(real_dev, dev); 4286 if (err < 0) 4287 goto del_dev; 4288 4289 netif_stacked_transfer_operstate(real_dev, dev); 4290 linkwatch_fire_event(dev); 4291 4292 macsec_generation++; 4293 4294 return 0; 4295 4296 del_dev: 4297 macsec_del_dev(macsec); 4298 unlink: 4299 netdev_upper_dev_unlink(real_dev, dev); 4300 unregister: 4301 unregister_netdevice(dev); 4302 return err; 4303 } 4304 4305 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], 4306 struct netlink_ext_ack *extack) 4307 { 4308 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 4309 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4310 int flag; 4311 bool es, scb, sci; 4312 4313 if (!data) 4314 return 0; 4315 4316 if (data[IFLA_MACSEC_CIPHER_SUITE]) 4317 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 4318 4319 if (data[IFLA_MACSEC_ICV_LEN]) { 4320 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4321 if (icv_len != MACSEC_DEFAULT_ICV_LEN) { 4322 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 4323 struct crypto_aead *dummy_tfm; 4324 4325 dummy_tfm = macsec_alloc_tfm(dummy_key, 4326 DEFAULT_SAK_LEN, 4327 icv_len); 4328 if (IS_ERR(dummy_tfm)) 4329 return PTR_ERR(dummy_tfm); 4330 crypto_free_aead(dummy_tfm); 4331 } 4332 } 4333 4334 switch (csid) { 4335 case MACSEC_CIPHER_ID_GCM_AES_128: 4336 case MACSEC_CIPHER_ID_GCM_AES_256: 4337 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 4338 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 4339 case MACSEC_DEFAULT_CIPHER_ID: 4340 if (icv_len < MACSEC_MIN_ICV_LEN || 4341 icv_len > MACSEC_STD_ICV_LEN) 4342 return -EINVAL; 4343 break; 4344 default: 4345 return -EINVAL; 4346 } 4347 4348 if (data[IFLA_MACSEC_ENCODING_SA]) { 4349 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 4350 return -EINVAL; 4351 } 4352 4353 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 4354 flag < IFLA_MACSEC_VALIDATION; 4355 flag++) { 4356 if (data[flag]) { 4357 if (nla_get_u8(data[flag]) > 1) 4358 return -EINVAL; 4359 } 4360 } 4361 4362 es = nla_get_u8_default(data[IFLA_MACSEC_ES], false); 4363 sci = nla_get_u8_default(data[IFLA_MACSEC_INC_SCI], false); 4364 scb = nla_get_u8_default(data[IFLA_MACSEC_SCB], false); 4365 4366 if ((sci && (scb || es)) || (scb && es)) 4367 return -EINVAL; 4368 4369 if (data[IFLA_MACSEC_VALIDATION] && 4370 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 4371 return -EINVAL; 4372 4373 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 4374 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 4375 !data[IFLA_MACSEC_WINDOW]) 4376 return -EINVAL; 4377 4378 return 0; 4379 } 4380 4381 static struct net *macsec_get_link_net(const struct net_device *dev) 4382 { 4383 return dev_net(macsec_priv(dev)->real_dev); 4384 } 4385 4386 struct net_device *macsec_get_real_dev(const struct net_device *dev) 4387 { 4388 return macsec_priv(dev)->real_dev; 4389 } 4390 EXPORT_SYMBOL_GPL(macsec_get_real_dev); 4391 4392 bool macsec_netdev_is_offloaded(struct net_device *dev) 4393 { 4394 return macsec_is_offloaded(macsec_priv(dev)); 4395 } 4396 EXPORT_SYMBOL_GPL(macsec_netdev_is_offloaded); 4397 4398 static size_t macsec_get_size(const struct net_device *dev) 4399 { 4400 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ 4401 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ 4402 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ 4403 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ 4404 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ 4405 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ 4406 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ 4407 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ 4408 nla_total_size(1) + /* IFLA_MACSEC_ES */ 4409 nla_total_size(1) + /* IFLA_MACSEC_SCB */ 4410 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ 4411 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ 4412 nla_total_size(1) + /* IFLA_MACSEC_OFFLOAD */ 4413 0; 4414 } 4415 4416 static int macsec_fill_info(struct sk_buff *skb, 4417 const struct net_device *dev) 4418 { 4419 struct macsec_tx_sc *tx_sc; 4420 struct macsec_dev *macsec; 4421 struct macsec_secy *secy; 4422 u64 csid; 4423 4424 macsec = macsec_priv(dev); 4425 secy = &macsec->secy; 4426 tx_sc = &secy->tx_sc; 4427 4428 switch (secy->key_len) { 4429 case MACSEC_GCM_AES_128_SAK_LEN: 4430 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 4431 break; 4432 case MACSEC_GCM_AES_256_SAK_LEN: 4433 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 4434 break; 4435 default: 4436 goto nla_put_failure; 4437 } 4438 4439 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 4440 IFLA_MACSEC_PAD) || 4441 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 4442 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 4443 csid, IFLA_MACSEC_PAD) || 4444 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 4445 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 4446 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 4447 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 4448 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 4449 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 4450 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 4451 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 4452 nla_put_u8(skb, IFLA_MACSEC_OFFLOAD, macsec->offload) || 4453 0) 4454 goto nla_put_failure; 4455 4456 if (secy->replay_protect) { 4457 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 4458 goto nla_put_failure; 4459 } 4460 4461 return 0; 4462 4463 nla_put_failure: 4464 return -EMSGSIZE; 4465 } 4466 4467 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 4468 .kind = "macsec", 4469 .priv_size = sizeof(struct macsec_dev), 4470 .maxtype = IFLA_MACSEC_MAX, 4471 .policy = macsec_rtnl_policy, 4472 .setup = macsec_setup, 4473 .validate = macsec_validate_attr, 4474 .newlink = macsec_newlink, 4475 .changelink = macsec_changelink, 4476 .dellink = macsec_dellink, 4477 .get_size = macsec_get_size, 4478 .fill_info = macsec_fill_info, 4479 .get_link_net = macsec_get_link_net, 4480 }; 4481 4482 static bool is_macsec_master(struct net_device *dev) 4483 { 4484 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 4485 } 4486 4487 static int macsec_notify(struct notifier_block *this, unsigned long event, 4488 void *ptr) 4489 { 4490 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 4491 struct macsec_rxh_data *rxd; 4492 struct macsec_dev *m, *n; 4493 LIST_HEAD(head); 4494 4495 if (!is_macsec_master(real_dev)) 4496 return NOTIFY_DONE; 4497 4498 rxd = macsec_data_rtnl(real_dev); 4499 4500 switch (event) { 4501 case NETDEV_DOWN: 4502 case NETDEV_UP: 4503 case NETDEV_CHANGE: 4504 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4505 struct net_device *dev = m->secy.netdev; 4506 4507 netif_stacked_transfer_operstate(real_dev, dev); 4508 } 4509 break; 4510 case NETDEV_UNREGISTER: 4511 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4512 macsec_common_dellink(m->secy.netdev, &head); 4513 } 4514 4515 netdev_rx_handler_unregister(real_dev); 4516 kfree(rxd); 4517 4518 unregister_netdevice_many(&head); 4519 break; 4520 case NETDEV_CHANGEMTU: 4521 list_for_each_entry(m, &rxd->secys, secys) { 4522 struct net_device *dev = m->secy.netdev; 4523 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 4524 macsec_extra_len(true)); 4525 4526 if (dev->mtu > mtu) 4527 dev_set_mtu(dev, mtu); 4528 } 4529 break; 4530 case NETDEV_FEAT_CHANGE: 4531 list_for_each_entry(m, &rxd->secys, secys) { 4532 macsec_inherit_tso_max(m->secy.netdev); 4533 netdev_update_features(m->secy.netdev); 4534 } 4535 break; 4536 } 4537 4538 return NOTIFY_OK; 4539 } 4540 4541 static struct notifier_block macsec_notifier = { 4542 .notifier_call = macsec_notify, 4543 }; 4544 4545 static int __init macsec_init(void) 4546 { 4547 int err; 4548 4549 pr_info("MACsec IEEE 802.1AE\n"); 4550 err = register_netdevice_notifier(&macsec_notifier); 4551 if (err) 4552 return err; 4553 4554 err = rtnl_link_register(&macsec_link_ops); 4555 if (err) 4556 goto notifier; 4557 4558 err = genl_register_family(&macsec_fam); 4559 if (err) 4560 goto rtnl; 4561 4562 return 0; 4563 4564 rtnl: 4565 rtnl_link_unregister(&macsec_link_ops); 4566 notifier: 4567 unregister_netdevice_notifier(&macsec_notifier); 4568 return err; 4569 } 4570 4571 static void __exit macsec_exit(void) 4572 { 4573 genl_unregister_family(&macsec_fam); 4574 rtnl_link_unregister(&macsec_link_ops); 4575 unregister_netdevice_notifier(&macsec_notifier); 4576 rcu_barrier(); 4577 } 4578 4579 module_init(macsec_init); 4580 module_exit(macsec_exit); 4581 4582 MODULE_ALIAS_RTNL_LINK("macsec"); 4583 MODULE_ALIAS_GENL_FAMILY("macsec"); 4584 4585 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 4586 MODULE_LICENSE("GPL v2"); 4587