1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * drivers/net/macsec.c - MACsec device 4 * 5 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net> 6 */ 7 8 #include <linux/types.h> 9 #include <linux/skbuff.h> 10 #include <linux/socket.h> 11 #include <linux/module.h> 12 #include <crypto/aead.h> 13 #include <linux/etherdevice.h> 14 #include <linux/netdevice.h> 15 #include <linux/rtnetlink.h> 16 #include <linux/refcount.h> 17 #include <net/genetlink.h> 18 #include <net/sock.h> 19 #include <net/gro_cells.h> 20 #include <net/macsec.h> 21 #include <net/dst_metadata.h> 22 #include <linux/phy.h> 23 #include <linux/byteorder/generic.h> 24 #include <linux/if_arp.h> 25 26 #include <uapi/linux/if_macsec.h> 27 28 /* SecTAG length = macsec_eth_header without the optional SCI */ 29 #define MACSEC_TAG_LEN 6 30 31 struct macsec_eth_header { 32 struct ethhdr eth; 33 /* SecTAG */ 34 u8 tci_an; 35 #if defined(__LITTLE_ENDIAN_BITFIELD) 36 u8 short_length:6, 37 unused:2; 38 #elif defined(__BIG_ENDIAN_BITFIELD) 39 u8 unused:2, 40 short_length:6; 41 #else 42 #error "Please fix <asm/byteorder.h>" 43 #endif 44 __be32 packet_number; 45 u8 secure_channel_id[8]; /* optional */ 46 } __packed; 47 48 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */ 49 #define MIN_NON_SHORT_LEN 48 50 51 #define GCM_AES_IV_LEN 12 52 53 #define for_each_rxsc(secy, sc) \ 54 for (sc = rcu_dereference_bh(secy->rx_sc); \ 55 sc; \ 56 sc = rcu_dereference_bh(sc->next)) 57 #define for_each_rxsc_rtnl(secy, sc) \ 58 for (sc = rtnl_dereference(secy->rx_sc); \ 59 sc; \ 60 sc = rtnl_dereference(sc->next)) 61 62 #define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31))) 63 64 struct gcm_iv_xpn { 65 union { 66 u8 short_secure_channel_id[4]; 67 ssci_t ssci; 68 }; 69 __be64 pn; 70 } __packed; 71 72 struct gcm_iv { 73 union { 74 u8 secure_channel_id[8]; 75 sci_t sci; 76 }; 77 __be32 pn; 78 }; 79 80 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT 81 82 struct pcpu_secy_stats { 83 struct macsec_dev_stats stats; 84 struct u64_stats_sync syncp; 85 }; 86 87 /** 88 * struct macsec_dev - private data 89 * @secy: SecY config 90 * @real_dev: pointer to underlying netdevice 91 * @dev_tracker: refcount tracker for @real_dev reference 92 * @stats: MACsec device stats 93 * @secys: linked list of SecY's on the underlying device 94 * @gro_cells: pointer to the Generic Receive Offload cell 95 * @offload: status of offloading on the MACsec device 96 */ 97 struct macsec_dev { 98 struct macsec_secy secy; 99 struct net_device *real_dev; 100 netdevice_tracker dev_tracker; 101 struct pcpu_secy_stats __percpu *stats; 102 struct list_head secys; 103 struct gro_cells gro_cells; 104 enum macsec_offload offload; 105 }; 106 107 /** 108 * struct macsec_rxh_data - rx_handler private argument 109 * @secys: linked list of SecY's on this underlying device 110 */ 111 struct macsec_rxh_data { 112 struct list_head secys; 113 }; 114 115 static struct macsec_dev *macsec_priv(const struct net_device *dev) 116 { 117 return (struct macsec_dev *)netdev_priv(dev); 118 } 119 120 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev) 121 { 122 return rcu_dereference_bh(dev->rx_handler_data); 123 } 124 125 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev) 126 { 127 return rtnl_dereference(dev->rx_handler_data); 128 } 129 130 struct macsec_cb { 131 struct aead_request *req; 132 union { 133 struct macsec_tx_sa *tx_sa; 134 struct macsec_rx_sa *rx_sa; 135 }; 136 u8 assoc_num; 137 bool valid; 138 bool has_sci; 139 }; 140 141 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr) 142 { 143 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr); 144 145 if (!sa || !sa->active) 146 return NULL; 147 148 if (!refcount_inc_not_zero(&sa->refcnt)) 149 return NULL; 150 151 return sa; 152 } 153 154 static struct macsec_rx_sa *macsec_active_rxsa_get(struct macsec_rx_sc *rx_sc) 155 { 156 struct macsec_rx_sa *sa = NULL; 157 int an; 158 159 for (an = 0; an < MACSEC_NUM_AN; an++) { 160 sa = macsec_rxsa_get(rx_sc->sa[an]); 161 if (sa) 162 break; 163 } 164 return sa; 165 } 166 167 static void free_rx_sc_rcu(struct rcu_head *head) 168 { 169 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head); 170 171 free_percpu(rx_sc->stats); 172 kfree(rx_sc); 173 } 174 175 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc) 176 { 177 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL; 178 } 179 180 static void macsec_rxsc_put(struct macsec_rx_sc *sc) 181 { 182 if (refcount_dec_and_test(&sc->refcnt)) 183 call_rcu(&sc->rcu_head, free_rx_sc_rcu); 184 } 185 186 static void free_rxsa(struct rcu_head *head) 187 { 188 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu); 189 190 crypto_free_aead(sa->key.tfm); 191 free_percpu(sa->stats); 192 kfree(sa); 193 } 194 195 static void macsec_rxsa_put(struct macsec_rx_sa *sa) 196 { 197 if (refcount_dec_and_test(&sa->refcnt)) 198 call_rcu(&sa->rcu, free_rxsa); 199 } 200 201 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr) 202 { 203 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr); 204 205 if (!sa || !sa->active) 206 return NULL; 207 208 if (!refcount_inc_not_zero(&sa->refcnt)) 209 return NULL; 210 211 return sa; 212 } 213 214 static void free_txsa(struct rcu_head *head) 215 { 216 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu); 217 218 crypto_free_aead(sa->key.tfm); 219 free_percpu(sa->stats); 220 kfree(sa); 221 } 222 223 static void macsec_txsa_put(struct macsec_tx_sa *sa) 224 { 225 if (refcount_dec_and_test(&sa->refcnt)) 226 call_rcu(&sa->rcu, free_txsa); 227 } 228 229 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) 230 { 231 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); 232 return (struct macsec_cb *)skb->cb; 233 } 234 235 #define MACSEC_PORT_SCB (0x0000) 236 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL) 237 #define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff) 238 239 #define MACSEC_GCM_AES_128_SAK_LEN 16 240 #define MACSEC_GCM_AES_256_SAK_LEN 32 241 242 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN 243 #define DEFAULT_XPN false 244 #define DEFAULT_SEND_SCI true 245 #define DEFAULT_ENCRYPT false 246 #define DEFAULT_ENCODING_SA 0 247 #define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1)) 248 249 static sci_t make_sci(const u8 *addr, __be16 port) 250 { 251 sci_t sci; 252 253 memcpy(&sci, addr, ETH_ALEN); 254 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); 255 256 return sci; 257 } 258 259 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present) 260 { 261 sci_t sci; 262 263 if (sci_present) 264 memcpy(&sci, hdr->secure_channel_id, 265 sizeof(hdr->secure_channel_id)); 266 else 267 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); 268 269 return sci; 270 } 271 272 static unsigned int macsec_sectag_len(bool sci_present) 273 { 274 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); 275 } 276 277 static unsigned int macsec_hdr_len(bool sci_present) 278 { 279 return macsec_sectag_len(sci_present) + ETH_HLEN; 280 } 281 282 static unsigned int macsec_extra_len(bool sci_present) 283 { 284 return macsec_sectag_len(sci_present) + sizeof(__be16); 285 } 286 287 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ 288 static void macsec_fill_sectag(struct macsec_eth_header *h, 289 const struct macsec_secy *secy, u32 pn, 290 bool sci_present) 291 { 292 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 293 294 memset(&h->tci_an, 0, macsec_sectag_len(sci_present)); 295 h->eth.h_proto = htons(ETH_P_MACSEC); 296 297 if (sci_present) { 298 h->tci_an |= MACSEC_TCI_SC; 299 memcpy(&h->secure_channel_id, &secy->sci, 300 sizeof(h->secure_channel_id)); 301 } else { 302 if (tx_sc->end_station) 303 h->tci_an |= MACSEC_TCI_ES; 304 if (tx_sc->scb) 305 h->tci_an |= MACSEC_TCI_SCB; 306 } 307 308 h->packet_number = htonl(pn); 309 310 /* with GCM, C/E clear for !encrypt, both set for encrypt */ 311 if (tx_sc->encrypt) 312 h->tci_an |= MACSEC_TCI_CONFID; 313 else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN) 314 h->tci_an |= MACSEC_TCI_C; 315 316 h->tci_an |= tx_sc->encoding_sa; 317 } 318 319 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) 320 { 321 if (data_len < MIN_NON_SHORT_LEN) 322 h->short_length = data_len; 323 } 324 325 /* Checks if a MACsec interface is being offloaded to an hardware engine */ 326 static bool macsec_is_offloaded(struct macsec_dev *macsec) 327 { 328 if (macsec->offload == MACSEC_OFFLOAD_MAC || 329 macsec->offload == MACSEC_OFFLOAD_PHY) 330 return true; 331 332 return false; 333 } 334 335 /* Checks if underlying layers implement MACsec offloading functions. */ 336 static bool macsec_check_offload(enum macsec_offload offload, 337 struct macsec_dev *macsec) 338 { 339 if (!macsec || !macsec->real_dev) 340 return false; 341 342 if (offload == MACSEC_OFFLOAD_PHY) 343 return macsec->real_dev->phydev && 344 macsec->real_dev->phydev->macsec_ops; 345 else if (offload == MACSEC_OFFLOAD_MAC) 346 return macsec->real_dev->features & NETIF_F_HW_MACSEC && 347 macsec->real_dev->macsec_ops; 348 349 return false; 350 } 351 352 static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload, 353 struct macsec_dev *macsec, 354 struct macsec_context *ctx) 355 { 356 if (ctx) { 357 memset(ctx, 0, sizeof(*ctx)); 358 ctx->offload = offload; 359 360 if (offload == MACSEC_OFFLOAD_PHY) 361 ctx->phydev = macsec->real_dev->phydev; 362 else if (offload == MACSEC_OFFLOAD_MAC) 363 ctx->netdev = macsec->real_dev; 364 } 365 366 if (offload == MACSEC_OFFLOAD_PHY) 367 return macsec->real_dev->phydev->macsec_ops; 368 else 369 return macsec->real_dev->macsec_ops; 370 } 371 372 /* Returns a pointer to the MACsec ops struct if any and updates the MACsec 373 * context device reference if provided. 374 */ 375 static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec, 376 struct macsec_context *ctx) 377 { 378 if (!macsec_check_offload(macsec->offload, macsec)) 379 return NULL; 380 381 return __macsec_get_ops(macsec->offload, macsec, ctx); 382 } 383 384 /* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */ 385 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn) 386 { 387 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; 388 int len = skb->len - 2 * ETH_ALEN; 389 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; 390 391 /* a) It comprises at least 17 octets */ 392 if (skb->len <= 16) 393 return false; 394 395 /* b) MACsec EtherType: already checked */ 396 397 /* c) V bit is clear */ 398 if (h->tci_an & MACSEC_TCI_VERSION) 399 return false; 400 401 /* d) ES or SCB => !SC */ 402 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && 403 (h->tci_an & MACSEC_TCI_SC)) 404 return false; 405 406 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ 407 if (h->unused) 408 return false; 409 410 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */ 411 if (!h->packet_number && !xpn) 412 return false; 413 414 /* length check, f) g) h) i) */ 415 if (h->short_length) 416 return len == extra_len + h->short_length; 417 return len >= extra_len + MIN_NON_SHORT_LEN; 418 } 419 420 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) 421 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN 422 423 static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn, 424 salt_t salt) 425 { 426 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv; 427 428 gcm_iv->ssci = ssci ^ salt.ssci; 429 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn; 430 } 431 432 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) 433 { 434 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; 435 436 gcm_iv->sci = sci; 437 gcm_iv->pn = htonl(pn); 438 } 439 440 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) 441 { 442 return (struct macsec_eth_header *)skb_mac_header(skb); 443 } 444 445 static void __macsec_pn_wrapped(struct macsec_secy *secy, 446 struct macsec_tx_sa *tx_sa) 447 { 448 pr_debug("PN wrapped, transitioning to !oper\n"); 449 tx_sa->active = false; 450 if (secy->protect_frames) 451 secy->operational = false; 452 } 453 454 void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa) 455 { 456 spin_lock_bh(&tx_sa->lock); 457 __macsec_pn_wrapped(secy, tx_sa); 458 spin_unlock_bh(&tx_sa->lock); 459 } 460 EXPORT_SYMBOL_GPL(macsec_pn_wrapped); 461 462 static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa, 463 struct macsec_secy *secy) 464 { 465 pn_t pn; 466 467 spin_lock_bh(&tx_sa->lock); 468 469 pn = tx_sa->next_pn_halves; 470 if (secy->xpn) 471 tx_sa->next_pn++; 472 else 473 tx_sa->next_pn_halves.lower++; 474 475 if (tx_sa->next_pn == 0) 476 __macsec_pn_wrapped(secy, tx_sa); 477 spin_unlock_bh(&tx_sa->lock); 478 479 return pn; 480 } 481 482 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) 483 { 484 struct macsec_dev *macsec = netdev_priv(dev); 485 486 skb->dev = macsec->real_dev; 487 skb_reset_mac_header(skb); 488 skb->protocol = eth_hdr(skb)->h_proto; 489 } 490 491 static unsigned int macsec_msdu_len(struct sk_buff *skb) 492 { 493 struct macsec_dev *macsec = macsec_priv(skb->dev); 494 struct macsec_secy *secy = &macsec->secy; 495 bool sci_present = macsec_skb_cb(skb)->has_sci; 496 497 return skb->len - macsec_hdr_len(sci_present) - secy->icv_len; 498 } 499 500 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, 501 struct macsec_tx_sa *tx_sa) 502 { 503 unsigned int msdu_len = macsec_msdu_len(skb); 504 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); 505 506 u64_stats_update_begin(&txsc_stats->syncp); 507 if (tx_sc->encrypt) { 508 txsc_stats->stats.OutOctetsEncrypted += msdu_len; 509 txsc_stats->stats.OutPktsEncrypted++; 510 this_cpu_inc(tx_sa->stats->OutPktsEncrypted); 511 } else { 512 txsc_stats->stats.OutOctetsProtected += msdu_len; 513 txsc_stats->stats.OutPktsProtected++; 514 this_cpu_inc(tx_sa->stats->OutPktsProtected); 515 } 516 u64_stats_update_end(&txsc_stats->syncp); 517 } 518 519 static void count_tx(struct net_device *dev, int ret, int len) 520 { 521 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 522 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 523 524 u64_stats_update_begin(&stats->syncp); 525 u64_stats_inc(&stats->tx_packets); 526 u64_stats_add(&stats->tx_bytes, len); 527 u64_stats_update_end(&stats->syncp); 528 } 529 } 530 531 static void macsec_encrypt_done(struct crypto_async_request *base, int err) 532 { 533 struct sk_buff *skb = base->data; 534 struct net_device *dev = skb->dev; 535 struct macsec_dev *macsec = macsec_priv(dev); 536 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 537 int len, ret; 538 539 aead_request_free(macsec_skb_cb(skb)->req); 540 541 rcu_read_lock_bh(); 542 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 543 /* packet is encrypted/protected so tx_bytes must be calculated */ 544 len = macsec_msdu_len(skb) + 2 * ETH_ALEN; 545 macsec_encrypt_finish(skb, dev); 546 ret = dev_queue_xmit(skb); 547 count_tx(dev, ret, len); 548 rcu_read_unlock_bh(); 549 550 macsec_txsa_put(sa); 551 dev_put(dev); 552 } 553 554 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, 555 unsigned char **iv, 556 struct scatterlist **sg, 557 int num_frags) 558 { 559 size_t size, iv_offset, sg_offset; 560 struct aead_request *req; 561 void *tmp; 562 563 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); 564 iv_offset = size; 565 size += GCM_AES_IV_LEN; 566 567 size = ALIGN(size, __alignof__(struct scatterlist)); 568 sg_offset = size; 569 size += sizeof(struct scatterlist) * num_frags; 570 571 tmp = kmalloc(size, GFP_ATOMIC); 572 if (!tmp) 573 return NULL; 574 575 *iv = (unsigned char *)(tmp + iv_offset); 576 *sg = (struct scatterlist *)(tmp + sg_offset); 577 req = tmp; 578 579 aead_request_set_tfm(req, tfm); 580 581 return req; 582 } 583 584 static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 585 struct net_device *dev) 586 { 587 int ret; 588 struct scatterlist *sg; 589 struct sk_buff *trailer; 590 unsigned char *iv; 591 struct ethhdr *eth; 592 struct macsec_eth_header *hh; 593 size_t unprotected_len; 594 struct aead_request *req; 595 struct macsec_secy *secy; 596 struct macsec_tx_sc *tx_sc; 597 struct macsec_tx_sa *tx_sa; 598 struct macsec_dev *macsec = macsec_priv(dev); 599 bool sci_present; 600 pn_t pn; 601 602 secy = &macsec->secy; 603 tx_sc = &secy->tx_sc; 604 605 /* 10.5.1 TX SA assignment */ 606 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); 607 if (!tx_sa) { 608 secy->operational = false; 609 kfree_skb(skb); 610 return ERR_PTR(-EINVAL); 611 } 612 613 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || 614 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { 615 struct sk_buff *nskb = skb_copy_expand(skb, 616 MACSEC_NEEDED_HEADROOM, 617 MACSEC_NEEDED_TAILROOM, 618 GFP_ATOMIC); 619 if (likely(nskb)) { 620 consume_skb(skb); 621 skb = nskb; 622 } else { 623 macsec_txsa_put(tx_sa); 624 kfree_skb(skb); 625 return ERR_PTR(-ENOMEM); 626 } 627 } else { 628 skb = skb_unshare(skb, GFP_ATOMIC); 629 if (!skb) { 630 macsec_txsa_put(tx_sa); 631 return ERR_PTR(-ENOMEM); 632 } 633 } 634 635 unprotected_len = skb->len; 636 eth = eth_hdr(skb); 637 sci_present = macsec_send_sci(secy); 638 hh = skb_push(skb, macsec_extra_len(sci_present)); 639 memmove(hh, eth, 2 * ETH_ALEN); 640 641 pn = tx_sa_update_pn(tx_sa, secy); 642 if (pn.full64 == 0) { 643 macsec_txsa_put(tx_sa); 644 kfree_skb(skb); 645 return ERR_PTR(-ENOLINK); 646 } 647 macsec_fill_sectag(hh, secy, pn.lower, sci_present); 648 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); 649 650 skb_put(skb, secy->icv_len); 651 652 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { 653 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 654 655 u64_stats_update_begin(&secy_stats->syncp); 656 secy_stats->stats.OutPktsTooLong++; 657 u64_stats_update_end(&secy_stats->syncp); 658 659 macsec_txsa_put(tx_sa); 660 kfree_skb(skb); 661 return ERR_PTR(-EINVAL); 662 } 663 664 ret = skb_cow_data(skb, 0, &trailer); 665 if (unlikely(ret < 0)) { 666 macsec_txsa_put(tx_sa); 667 kfree_skb(skb); 668 return ERR_PTR(ret); 669 } 670 671 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret); 672 if (!req) { 673 macsec_txsa_put(tx_sa); 674 kfree_skb(skb); 675 return ERR_PTR(-ENOMEM); 676 } 677 678 if (secy->xpn) 679 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt); 680 else 681 macsec_fill_iv(iv, secy->sci, pn.lower); 682 683 sg_init_table(sg, ret); 684 ret = skb_to_sgvec(skb, sg, 0, skb->len); 685 if (unlikely(ret < 0)) { 686 aead_request_free(req); 687 macsec_txsa_put(tx_sa); 688 kfree_skb(skb); 689 return ERR_PTR(ret); 690 } 691 692 if (tx_sc->encrypt) { 693 int len = skb->len - macsec_hdr_len(sci_present) - 694 secy->icv_len; 695 aead_request_set_crypt(req, sg, sg, len, iv); 696 aead_request_set_ad(req, macsec_hdr_len(sci_present)); 697 } else { 698 aead_request_set_crypt(req, sg, sg, 0, iv); 699 aead_request_set_ad(req, skb->len - secy->icv_len); 700 } 701 702 macsec_skb_cb(skb)->req = req; 703 macsec_skb_cb(skb)->tx_sa = tx_sa; 704 macsec_skb_cb(skb)->has_sci = sci_present; 705 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 706 707 dev_hold(skb->dev); 708 ret = crypto_aead_encrypt(req); 709 if (ret == -EINPROGRESS) { 710 return ERR_PTR(ret); 711 } else if (ret != 0) { 712 dev_put(skb->dev); 713 kfree_skb(skb); 714 aead_request_free(req); 715 macsec_txsa_put(tx_sa); 716 return ERR_PTR(-EINVAL); 717 } 718 719 dev_put(skb->dev); 720 aead_request_free(req); 721 macsec_txsa_put(tx_sa); 722 723 return skb; 724 } 725 726 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 727 { 728 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 729 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 730 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 731 u32 lowest_pn = 0; 732 733 spin_lock(&rx_sa->lock); 734 if (rx_sa->next_pn_halves.lower >= secy->replay_window) 735 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window; 736 737 /* Now perform replay protection check again 738 * (see IEEE 802.1AE-2006 figure 10-5) 739 */ 740 if (secy->replay_protect && pn < lowest_pn && 741 (!secy->xpn || pn_same_half(pn, lowest_pn))) { 742 spin_unlock(&rx_sa->lock); 743 u64_stats_update_begin(&rxsc_stats->syncp); 744 rxsc_stats->stats.InPktsLate++; 745 u64_stats_update_end(&rxsc_stats->syncp); 746 secy->netdev->stats.rx_dropped++; 747 return false; 748 } 749 750 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 751 unsigned int msdu_len = macsec_msdu_len(skb); 752 u64_stats_update_begin(&rxsc_stats->syncp); 753 if (hdr->tci_an & MACSEC_TCI_E) 754 rxsc_stats->stats.InOctetsDecrypted += msdu_len; 755 else 756 rxsc_stats->stats.InOctetsValidated += msdu_len; 757 u64_stats_update_end(&rxsc_stats->syncp); 758 } 759 760 if (!macsec_skb_cb(skb)->valid) { 761 spin_unlock(&rx_sa->lock); 762 763 /* 10.6.5 */ 764 if (hdr->tci_an & MACSEC_TCI_C || 765 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 766 u64_stats_update_begin(&rxsc_stats->syncp); 767 rxsc_stats->stats.InPktsNotValid++; 768 u64_stats_update_end(&rxsc_stats->syncp); 769 this_cpu_inc(rx_sa->stats->InPktsNotValid); 770 secy->netdev->stats.rx_errors++; 771 return false; 772 } 773 774 u64_stats_update_begin(&rxsc_stats->syncp); 775 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 776 rxsc_stats->stats.InPktsInvalid++; 777 this_cpu_inc(rx_sa->stats->InPktsInvalid); 778 } else if (pn < lowest_pn) { 779 rxsc_stats->stats.InPktsDelayed++; 780 } else { 781 rxsc_stats->stats.InPktsUnchecked++; 782 } 783 u64_stats_update_end(&rxsc_stats->syncp); 784 } else { 785 u64_stats_update_begin(&rxsc_stats->syncp); 786 if (pn < lowest_pn) { 787 rxsc_stats->stats.InPktsDelayed++; 788 } else { 789 rxsc_stats->stats.InPktsOK++; 790 this_cpu_inc(rx_sa->stats->InPktsOK); 791 } 792 u64_stats_update_end(&rxsc_stats->syncp); 793 794 // Instead of "pn >=" - to support pn overflow in xpn 795 if (pn + 1 > rx_sa->next_pn_halves.lower) { 796 rx_sa->next_pn_halves.lower = pn + 1; 797 } else if (secy->xpn && 798 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) { 799 rx_sa->next_pn_halves.upper++; 800 rx_sa->next_pn_halves.lower = pn + 1; 801 } 802 803 spin_unlock(&rx_sa->lock); 804 } 805 806 return true; 807 } 808 809 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 810 { 811 skb->pkt_type = PACKET_HOST; 812 skb->protocol = eth_type_trans(skb, dev); 813 814 skb_reset_network_header(skb); 815 if (!skb_transport_header_was_set(skb)) 816 skb_reset_transport_header(skb); 817 skb_reset_mac_len(skb); 818 } 819 820 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 821 { 822 skb->ip_summed = CHECKSUM_NONE; 823 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 824 skb_pull(skb, hdr_len); 825 pskb_trim_unique(skb, skb->len - icv_len); 826 } 827 828 static void count_rx(struct net_device *dev, int len) 829 { 830 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 831 832 u64_stats_update_begin(&stats->syncp); 833 u64_stats_inc(&stats->rx_packets); 834 u64_stats_add(&stats->rx_bytes, len); 835 u64_stats_update_end(&stats->syncp); 836 } 837 838 static void macsec_decrypt_done(struct crypto_async_request *base, int err) 839 { 840 struct sk_buff *skb = base->data; 841 struct net_device *dev = skb->dev; 842 struct macsec_dev *macsec = macsec_priv(dev); 843 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 844 struct macsec_rx_sc *rx_sc = rx_sa->sc; 845 int len; 846 u32 pn; 847 848 aead_request_free(macsec_skb_cb(skb)->req); 849 850 if (!err) 851 macsec_skb_cb(skb)->valid = true; 852 853 rcu_read_lock_bh(); 854 pn = ntohl(macsec_ethhdr(skb)->packet_number); 855 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 856 rcu_read_unlock_bh(); 857 kfree_skb(skb); 858 goto out; 859 } 860 861 macsec_finalize_skb(skb, macsec->secy.icv_len, 862 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 863 len = skb->len; 864 macsec_reset_skb(skb, macsec->secy.netdev); 865 866 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS) 867 count_rx(dev, len); 868 869 rcu_read_unlock_bh(); 870 871 out: 872 macsec_rxsa_put(rx_sa); 873 macsec_rxsc_put(rx_sc); 874 dev_put(dev); 875 } 876 877 static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 878 struct net_device *dev, 879 struct macsec_rx_sa *rx_sa, 880 sci_t sci, 881 struct macsec_secy *secy) 882 { 883 int ret; 884 struct scatterlist *sg; 885 struct sk_buff *trailer; 886 unsigned char *iv; 887 struct aead_request *req; 888 struct macsec_eth_header *hdr; 889 u32 hdr_pn; 890 u16 icv_len = secy->icv_len; 891 892 macsec_skb_cb(skb)->valid = false; 893 skb = skb_share_check(skb, GFP_ATOMIC); 894 if (!skb) 895 return ERR_PTR(-ENOMEM); 896 897 ret = skb_cow_data(skb, 0, &trailer); 898 if (unlikely(ret < 0)) { 899 kfree_skb(skb); 900 return ERR_PTR(ret); 901 } 902 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret); 903 if (!req) { 904 kfree_skb(skb); 905 return ERR_PTR(-ENOMEM); 906 } 907 908 hdr = (struct macsec_eth_header *)skb->data; 909 hdr_pn = ntohl(hdr->packet_number); 910 911 if (secy->xpn) { 912 pn_t recovered_pn = rx_sa->next_pn_halves; 913 914 recovered_pn.lower = hdr_pn; 915 if (hdr_pn < rx_sa->next_pn_halves.lower && 916 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower)) 917 recovered_pn.upper++; 918 919 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64, 920 rx_sa->key.salt); 921 } else { 922 macsec_fill_iv(iv, sci, hdr_pn); 923 } 924 925 sg_init_table(sg, ret); 926 ret = skb_to_sgvec(skb, sg, 0, skb->len); 927 if (unlikely(ret < 0)) { 928 aead_request_free(req); 929 kfree_skb(skb); 930 return ERR_PTR(ret); 931 } 932 933 if (hdr->tci_an & MACSEC_TCI_E) { 934 /* confidentiality: ethernet + macsec header 935 * authenticated, encrypted payload 936 */ 937 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 938 939 aead_request_set_crypt(req, sg, sg, len, iv); 940 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 941 skb = skb_unshare(skb, GFP_ATOMIC); 942 if (!skb) { 943 aead_request_free(req); 944 return ERR_PTR(-ENOMEM); 945 } 946 } else { 947 /* integrity only: all headers + data authenticated */ 948 aead_request_set_crypt(req, sg, sg, icv_len, iv); 949 aead_request_set_ad(req, skb->len - icv_len); 950 } 951 952 macsec_skb_cb(skb)->req = req; 953 skb->dev = dev; 954 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 955 956 dev_hold(dev); 957 ret = crypto_aead_decrypt(req); 958 if (ret == -EINPROGRESS) { 959 return ERR_PTR(ret); 960 } else if (ret != 0) { 961 /* decryption/authentication failed 962 * 10.6 if validateFrames is disabled, deliver anyway 963 */ 964 if (ret != -EBADMSG) { 965 kfree_skb(skb); 966 skb = ERR_PTR(ret); 967 } 968 } else { 969 macsec_skb_cb(skb)->valid = true; 970 } 971 dev_put(dev); 972 973 aead_request_free(req); 974 975 return skb; 976 } 977 978 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 979 { 980 struct macsec_rx_sc *rx_sc; 981 982 for_each_rxsc(secy, rx_sc) { 983 if (rx_sc->sci == sci) 984 return rx_sc; 985 } 986 987 return NULL; 988 } 989 990 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 991 { 992 struct macsec_rx_sc *rx_sc; 993 994 for_each_rxsc_rtnl(secy, rx_sc) { 995 if (rx_sc->sci == sci) 996 return rx_sc; 997 } 998 999 return NULL; 1000 } 1001 1002 static enum rx_handler_result handle_not_macsec(struct sk_buff *skb) 1003 { 1004 /* Deliver to the uncontrolled port by default */ 1005 enum rx_handler_result ret = RX_HANDLER_PASS; 1006 struct ethhdr *hdr = eth_hdr(skb); 1007 struct metadata_dst *md_dst; 1008 struct macsec_rxh_data *rxd; 1009 struct macsec_dev *macsec; 1010 1011 rcu_read_lock(); 1012 rxd = macsec_data_rcu(skb->dev); 1013 md_dst = skb_metadata_dst(skb); 1014 1015 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1016 struct sk_buff *nskb; 1017 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 1018 struct net_device *ndev = macsec->secy.netdev; 1019 1020 /* If h/w offloading is enabled, HW decodes frames and strips 1021 * the SecTAG, so we have to deduce which port to deliver to. 1022 */ 1023 if (macsec_is_offloaded(macsec) && netif_running(ndev)) { 1024 if (md_dst && md_dst->type == METADATA_MACSEC && 1025 (!find_rx_sc(&macsec->secy, md_dst->u.macsec_info.sci))) 1026 continue; 1027 1028 if (ether_addr_equal_64bits(hdr->h_dest, 1029 ndev->dev_addr)) { 1030 /* exact match, divert skb to this port */ 1031 skb->dev = ndev; 1032 skb->pkt_type = PACKET_HOST; 1033 ret = RX_HANDLER_ANOTHER; 1034 goto out; 1035 } else if (is_multicast_ether_addr_64bits( 1036 hdr->h_dest)) { 1037 /* multicast frame, deliver on this port too */ 1038 nskb = skb_clone(skb, GFP_ATOMIC); 1039 if (!nskb) 1040 break; 1041 1042 nskb->dev = ndev; 1043 if (ether_addr_equal_64bits(hdr->h_dest, 1044 ndev->broadcast)) 1045 nskb->pkt_type = PACKET_BROADCAST; 1046 else 1047 nskb->pkt_type = PACKET_MULTICAST; 1048 1049 __netif_rx(nskb); 1050 } 1051 continue; 1052 } 1053 1054 /* 10.6 If the management control validateFrames is not 1055 * Strict, frames without a SecTAG are received, counted, and 1056 * delivered to the Controlled Port 1057 */ 1058 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1059 u64_stats_update_begin(&secy_stats->syncp); 1060 secy_stats->stats.InPktsNoTag++; 1061 u64_stats_update_end(&secy_stats->syncp); 1062 macsec->secy.netdev->stats.rx_dropped++; 1063 continue; 1064 } 1065 1066 /* deliver on this port */ 1067 nskb = skb_clone(skb, GFP_ATOMIC); 1068 if (!nskb) 1069 break; 1070 1071 nskb->dev = ndev; 1072 1073 if (__netif_rx(nskb) == NET_RX_SUCCESS) { 1074 u64_stats_update_begin(&secy_stats->syncp); 1075 secy_stats->stats.InPktsUntagged++; 1076 u64_stats_update_end(&secy_stats->syncp); 1077 } 1078 } 1079 1080 out: 1081 rcu_read_unlock(); 1082 return ret; 1083 } 1084 1085 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 1086 { 1087 struct sk_buff *skb = *pskb; 1088 struct net_device *dev = skb->dev; 1089 struct macsec_eth_header *hdr; 1090 struct macsec_secy *secy = NULL; 1091 struct macsec_rx_sc *rx_sc; 1092 struct macsec_rx_sa *rx_sa; 1093 struct macsec_rxh_data *rxd; 1094 struct macsec_dev *macsec; 1095 unsigned int len; 1096 sci_t sci; 1097 u32 hdr_pn; 1098 bool cbit; 1099 struct pcpu_rx_sc_stats *rxsc_stats; 1100 struct pcpu_secy_stats *secy_stats; 1101 bool pulled_sci; 1102 int ret; 1103 1104 if (skb_headroom(skb) < ETH_HLEN) 1105 goto drop_direct; 1106 1107 hdr = macsec_ethhdr(skb); 1108 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) 1109 return handle_not_macsec(skb); 1110 1111 skb = skb_unshare(skb, GFP_ATOMIC); 1112 *pskb = skb; 1113 if (!skb) 1114 return RX_HANDLER_CONSUMED; 1115 1116 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1117 if (!pulled_sci) { 1118 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1119 goto drop_direct; 1120 } 1121 1122 hdr = macsec_ethhdr(skb); 1123 1124 /* Frames with a SecTAG that has the TCI E bit set but the C 1125 * bit clear are discarded, as this reserved encoding is used 1126 * to identify frames with a SecTAG that are not to be 1127 * delivered to the Controlled Port. 1128 */ 1129 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1130 return RX_HANDLER_PASS; 1131 1132 /* now, pull the extra length */ 1133 if (hdr->tci_an & MACSEC_TCI_SC) { 1134 if (!pulled_sci) 1135 goto drop_direct; 1136 } 1137 1138 /* ethernet header is part of crypto processing */ 1139 skb_push(skb, ETH_HLEN); 1140 1141 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1142 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1143 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci); 1144 1145 rcu_read_lock(); 1146 rxd = macsec_data_rcu(skb->dev); 1147 1148 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1149 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1150 1151 sc = sc ? macsec_rxsc_get(sc) : NULL; 1152 1153 if (sc) { 1154 secy = &macsec->secy; 1155 rx_sc = sc; 1156 break; 1157 } 1158 } 1159 1160 if (!secy) 1161 goto nosci; 1162 1163 dev = secy->netdev; 1164 macsec = macsec_priv(dev); 1165 secy_stats = this_cpu_ptr(macsec->stats); 1166 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1167 1168 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) { 1169 u64_stats_update_begin(&secy_stats->syncp); 1170 secy_stats->stats.InPktsBadTag++; 1171 u64_stats_update_end(&secy_stats->syncp); 1172 secy->netdev->stats.rx_errors++; 1173 goto drop_nosa; 1174 } 1175 1176 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1177 if (!rx_sa) { 1178 /* 10.6.1 if the SA is not in use */ 1179 1180 /* If validateFrames is Strict or the C bit in the 1181 * SecTAG is set, discard 1182 */ 1183 struct macsec_rx_sa *active_rx_sa = macsec_active_rxsa_get(rx_sc); 1184 if (hdr->tci_an & MACSEC_TCI_C || 1185 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1186 u64_stats_update_begin(&rxsc_stats->syncp); 1187 rxsc_stats->stats.InPktsNotUsingSA++; 1188 u64_stats_update_end(&rxsc_stats->syncp); 1189 secy->netdev->stats.rx_errors++; 1190 if (active_rx_sa) 1191 this_cpu_inc(active_rx_sa->stats->InPktsNotUsingSA); 1192 goto drop_nosa; 1193 } 1194 1195 /* not Strict, the frame (with the SecTAG and ICV 1196 * removed) is delivered to the Controlled Port. 1197 */ 1198 u64_stats_update_begin(&rxsc_stats->syncp); 1199 rxsc_stats->stats.InPktsUnusedSA++; 1200 u64_stats_update_end(&rxsc_stats->syncp); 1201 if (active_rx_sa) 1202 this_cpu_inc(active_rx_sa->stats->InPktsUnusedSA); 1203 goto deliver; 1204 } 1205 1206 /* First, PN check to avoid decrypting obviously wrong packets */ 1207 hdr_pn = ntohl(hdr->packet_number); 1208 if (secy->replay_protect) { 1209 bool late; 1210 1211 spin_lock(&rx_sa->lock); 1212 late = rx_sa->next_pn_halves.lower >= secy->replay_window && 1213 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window); 1214 1215 if (secy->xpn) 1216 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn); 1217 spin_unlock(&rx_sa->lock); 1218 1219 if (late) { 1220 u64_stats_update_begin(&rxsc_stats->syncp); 1221 rxsc_stats->stats.InPktsLate++; 1222 u64_stats_update_end(&rxsc_stats->syncp); 1223 macsec->secy.netdev->stats.rx_dropped++; 1224 goto drop; 1225 } 1226 } 1227 1228 macsec_skb_cb(skb)->rx_sa = rx_sa; 1229 1230 /* Disabled && !changed text => skip validation */ 1231 if (hdr->tci_an & MACSEC_TCI_C || 1232 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1233 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1234 1235 if (IS_ERR(skb)) { 1236 /* the decrypt callback needs the reference */ 1237 if (PTR_ERR(skb) != -EINPROGRESS) { 1238 macsec_rxsa_put(rx_sa); 1239 macsec_rxsc_put(rx_sc); 1240 } 1241 rcu_read_unlock(); 1242 *pskb = NULL; 1243 return RX_HANDLER_CONSUMED; 1244 } 1245 1246 if (!macsec_post_decrypt(skb, secy, hdr_pn)) 1247 goto drop; 1248 1249 deliver: 1250 macsec_finalize_skb(skb, secy->icv_len, 1251 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1252 len = skb->len; 1253 macsec_reset_skb(skb, secy->netdev); 1254 1255 if (rx_sa) 1256 macsec_rxsa_put(rx_sa); 1257 macsec_rxsc_put(rx_sc); 1258 1259 skb_orphan(skb); 1260 ret = gro_cells_receive(&macsec->gro_cells, skb); 1261 if (ret == NET_RX_SUCCESS) 1262 count_rx(dev, len); 1263 else 1264 macsec->secy.netdev->stats.rx_dropped++; 1265 1266 rcu_read_unlock(); 1267 1268 *pskb = NULL; 1269 return RX_HANDLER_CONSUMED; 1270 1271 drop: 1272 macsec_rxsa_put(rx_sa); 1273 drop_nosa: 1274 macsec_rxsc_put(rx_sc); 1275 rcu_read_unlock(); 1276 drop_direct: 1277 kfree_skb(skb); 1278 *pskb = NULL; 1279 return RX_HANDLER_CONSUMED; 1280 1281 nosci: 1282 /* 10.6.1 if the SC is not found */ 1283 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1284 if (!cbit) 1285 macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN, 1286 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1287 1288 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1289 struct sk_buff *nskb; 1290 1291 secy_stats = this_cpu_ptr(macsec->stats); 1292 1293 /* If validateFrames is Strict or the C bit in the 1294 * SecTAG is set, discard 1295 */ 1296 if (cbit || 1297 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1298 u64_stats_update_begin(&secy_stats->syncp); 1299 secy_stats->stats.InPktsNoSCI++; 1300 u64_stats_update_end(&secy_stats->syncp); 1301 macsec->secy.netdev->stats.rx_errors++; 1302 continue; 1303 } 1304 1305 /* not strict, the frame (with the SecTAG and ICV 1306 * removed) is delivered to the Controlled Port. 1307 */ 1308 nskb = skb_clone(skb, GFP_ATOMIC); 1309 if (!nskb) 1310 break; 1311 1312 macsec_reset_skb(nskb, macsec->secy.netdev); 1313 1314 ret = __netif_rx(nskb); 1315 if (ret == NET_RX_SUCCESS) { 1316 u64_stats_update_begin(&secy_stats->syncp); 1317 secy_stats->stats.InPktsUnknownSCI++; 1318 u64_stats_update_end(&secy_stats->syncp); 1319 } else { 1320 macsec->secy.netdev->stats.rx_dropped++; 1321 } 1322 } 1323 1324 rcu_read_unlock(); 1325 *pskb = skb; 1326 return RX_HANDLER_PASS; 1327 } 1328 1329 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1330 { 1331 struct crypto_aead *tfm; 1332 int ret; 1333 1334 /* Pick a sync gcm(aes) cipher to ensure order is preserved. */ 1335 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC); 1336 1337 if (IS_ERR(tfm)) 1338 return tfm; 1339 1340 ret = crypto_aead_setkey(tfm, key, key_len); 1341 if (ret < 0) 1342 goto fail; 1343 1344 ret = crypto_aead_setauthsize(tfm, icv_len); 1345 if (ret < 0) 1346 goto fail; 1347 1348 return tfm; 1349 fail: 1350 crypto_free_aead(tfm); 1351 return ERR_PTR(ret); 1352 } 1353 1354 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1355 int icv_len) 1356 { 1357 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1358 if (!rx_sa->stats) 1359 return -ENOMEM; 1360 1361 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1362 if (IS_ERR(rx_sa->key.tfm)) { 1363 free_percpu(rx_sa->stats); 1364 return PTR_ERR(rx_sa->key.tfm); 1365 } 1366 1367 rx_sa->ssci = MACSEC_UNDEF_SSCI; 1368 rx_sa->active = false; 1369 rx_sa->next_pn = 1; 1370 refcount_set(&rx_sa->refcnt, 1); 1371 spin_lock_init(&rx_sa->lock); 1372 1373 return 0; 1374 } 1375 1376 static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1377 { 1378 rx_sa->active = false; 1379 1380 macsec_rxsa_put(rx_sa); 1381 } 1382 1383 static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1384 { 1385 int i; 1386 1387 for (i = 0; i < MACSEC_NUM_AN; i++) { 1388 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1389 1390 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1391 if (sa) 1392 clear_rx_sa(sa); 1393 } 1394 1395 macsec_rxsc_put(rx_sc); 1396 } 1397 1398 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1399 { 1400 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1401 1402 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1403 rx_sc; 1404 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1405 if (rx_sc->sci == sci) { 1406 if (rx_sc->active) 1407 secy->n_rx_sc--; 1408 rcu_assign_pointer(*rx_scp, rx_sc->next); 1409 return rx_sc; 1410 } 1411 } 1412 1413 return NULL; 1414 } 1415 1416 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci) 1417 { 1418 struct macsec_rx_sc *rx_sc; 1419 struct macsec_dev *macsec; 1420 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1421 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1422 struct macsec_secy *secy; 1423 1424 list_for_each_entry(macsec, &rxd->secys, secys) { 1425 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1426 return ERR_PTR(-EEXIST); 1427 } 1428 1429 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL); 1430 if (!rx_sc) 1431 return ERR_PTR(-ENOMEM); 1432 1433 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1434 if (!rx_sc->stats) { 1435 kfree(rx_sc); 1436 return ERR_PTR(-ENOMEM); 1437 } 1438 1439 rx_sc->sci = sci; 1440 rx_sc->active = true; 1441 refcount_set(&rx_sc->refcnt, 1); 1442 1443 secy = &macsec_priv(dev)->secy; 1444 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1445 rcu_assign_pointer(secy->rx_sc, rx_sc); 1446 1447 if (rx_sc->active) 1448 secy->n_rx_sc++; 1449 1450 return rx_sc; 1451 } 1452 1453 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1454 int icv_len) 1455 { 1456 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1457 if (!tx_sa->stats) 1458 return -ENOMEM; 1459 1460 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1461 if (IS_ERR(tx_sa->key.tfm)) { 1462 free_percpu(tx_sa->stats); 1463 return PTR_ERR(tx_sa->key.tfm); 1464 } 1465 1466 tx_sa->ssci = MACSEC_UNDEF_SSCI; 1467 tx_sa->active = false; 1468 refcount_set(&tx_sa->refcnt, 1); 1469 spin_lock_init(&tx_sa->lock); 1470 1471 return 0; 1472 } 1473 1474 static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1475 { 1476 tx_sa->active = false; 1477 1478 macsec_txsa_put(tx_sa); 1479 } 1480 1481 static struct genl_family macsec_fam; 1482 1483 static struct net_device *get_dev_from_nl(struct net *net, 1484 struct nlattr **attrs) 1485 { 1486 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1487 struct net_device *dev; 1488 1489 dev = __dev_get_by_index(net, ifindex); 1490 if (!dev) 1491 return ERR_PTR(-ENODEV); 1492 1493 if (!netif_is_macsec(dev)) 1494 return ERR_PTR(-ENODEV); 1495 1496 return dev; 1497 } 1498 1499 static enum macsec_offload nla_get_offload(const struct nlattr *nla) 1500 { 1501 return (__force enum macsec_offload)nla_get_u8(nla); 1502 } 1503 1504 static sci_t nla_get_sci(const struct nlattr *nla) 1505 { 1506 return (__force sci_t)nla_get_u64(nla); 1507 } 1508 1509 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, 1510 int padattr) 1511 { 1512 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); 1513 } 1514 1515 static ssci_t nla_get_ssci(const struct nlattr *nla) 1516 { 1517 return (__force ssci_t)nla_get_u32(nla); 1518 } 1519 1520 static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value) 1521 { 1522 return nla_put_u32(skb, attrtype, (__force u64)value); 1523 } 1524 1525 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1526 struct nlattr **attrs, 1527 struct nlattr **tb_sa, 1528 struct net_device **devp, 1529 struct macsec_secy **secyp, 1530 struct macsec_tx_sc **scp, 1531 u8 *assoc_num) 1532 { 1533 struct net_device *dev; 1534 struct macsec_secy *secy; 1535 struct macsec_tx_sc *tx_sc; 1536 struct macsec_tx_sa *tx_sa; 1537 1538 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1539 return ERR_PTR(-EINVAL); 1540 1541 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1542 1543 dev = get_dev_from_nl(net, attrs); 1544 if (IS_ERR(dev)) 1545 return ERR_CAST(dev); 1546 1547 if (*assoc_num >= MACSEC_NUM_AN) 1548 return ERR_PTR(-EINVAL); 1549 1550 secy = &macsec_priv(dev)->secy; 1551 tx_sc = &secy->tx_sc; 1552 1553 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1554 if (!tx_sa) 1555 return ERR_PTR(-ENODEV); 1556 1557 *devp = dev; 1558 *scp = tx_sc; 1559 *secyp = secy; 1560 return tx_sa; 1561 } 1562 1563 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1564 struct nlattr **attrs, 1565 struct nlattr **tb_rxsc, 1566 struct net_device **devp, 1567 struct macsec_secy **secyp) 1568 { 1569 struct net_device *dev; 1570 struct macsec_secy *secy; 1571 struct macsec_rx_sc *rx_sc; 1572 sci_t sci; 1573 1574 dev = get_dev_from_nl(net, attrs); 1575 if (IS_ERR(dev)) 1576 return ERR_CAST(dev); 1577 1578 secy = &macsec_priv(dev)->secy; 1579 1580 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1581 return ERR_PTR(-EINVAL); 1582 1583 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1584 rx_sc = find_rx_sc_rtnl(secy, sci); 1585 if (!rx_sc) 1586 return ERR_PTR(-ENODEV); 1587 1588 *secyp = secy; 1589 *devp = dev; 1590 1591 return rx_sc; 1592 } 1593 1594 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1595 struct nlattr **attrs, 1596 struct nlattr **tb_rxsc, 1597 struct nlattr **tb_sa, 1598 struct net_device **devp, 1599 struct macsec_secy **secyp, 1600 struct macsec_rx_sc **scp, 1601 u8 *assoc_num) 1602 { 1603 struct macsec_rx_sc *rx_sc; 1604 struct macsec_rx_sa *rx_sa; 1605 1606 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1607 return ERR_PTR(-EINVAL); 1608 1609 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1610 if (*assoc_num >= MACSEC_NUM_AN) 1611 return ERR_PTR(-EINVAL); 1612 1613 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1614 if (IS_ERR(rx_sc)) 1615 return ERR_CAST(rx_sc); 1616 1617 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1618 if (!rx_sa) 1619 return ERR_PTR(-ENODEV); 1620 1621 *scp = rx_sc; 1622 return rx_sa; 1623 } 1624 1625 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1626 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1627 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1628 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1629 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED }, 1630 }; 1631 1632 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1633 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1634 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, 1635 }; 1636 1637 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1638 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, 1639 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, 1640 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4), 1641 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY, 1642 .len = MACSEC_KEYID_LEN, }, 1643 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1644 .len = MACSEC_MAX_KEY_LEN, }, 1645 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 }, 1646 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY, 1647 .len = MACSEC_SALT_LEN, }, 1648 }; 1649 1650 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = { 1651 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 }, 1652 }; 1653 1654 /* Offloads an operation to a device driver */ 1655 static int macsec_offload(int (* const func)(struct macsec_context *), 1656 struct macsec_context *ctx) 1657 { 1658 int ret; 1659 1660 if (unlikely(!func)) 1661 return 0; 1662 1663 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1664 mutex_lock(&ctx->phydev->lock); 1665 1666 ret = (*func)(ctx); 1667 1668 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1669 mutex_unlock(&ctx->phydev->lock); 1670 1671 return ret; 1672 } 1673 1674 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1675 { 1676 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1677 return -EINVAL; 1678 1679 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL)) 1680 return -EINVAL; 1681 1682 return 0; 1683 } 1684 1685 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1686 { 1687 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1688 return -EINVAL; 1689 1690 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL)) 1691 return -EINVAL; 1692 1693 return 0; 1694 } 1695 1696 static bool validate_add_rxsa(struct nlattr **attrs) 1697 { 1698 if (!attrs[MACSEC_SA_ATTR_AN] || 1699 !attrs[MACSEC_SA_ATTR_KEY] || 1700 !attrs[MACSEC_SA_ATTR_KEYID]) 1701 return false; 1702 1703 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1704 return false; 1705 1706 if (attrs[MACSEC_SA_ATTR_PN] && 1707 nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 1708 return false; 1709 1710 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1711 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1712 return false; 1713 } 1714 1715 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1716 return false; 1717 1718 return true; 1719 } 1720 1721 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1722 { 1723 struct net_device *dev; 1724 struct nlattr **attrs = info->attrs; 1725 struct macsec_secy *secy; 1726 struct macsec_rx_sc *rx_sc; 1727 struct macsec_rx_sa *rx_sa; 1728 unsigned char assoc_num; 1729 int pn_len; 1730 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1731 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1732 int err; 1733 1734 if (!attrs[MACSEC_ATTR_IFINDEX]) 1735 return -EINVAL; 1736 1737 if (parse_sa_config(attrs, tb_sa)) 1738 return -EINVAL; 1739 1740 if (parse_rxsc_config(attrs, tb_rxsc)) 1741 return -EINVAL; 1742 1743 if (!validate_add_rxsa(tb_sa)) 1744 return -EINVAL; 1745 1746 rtnl_lock(); 1747 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1748 if (IS_ERR(rx_sc)) { 1749 rtnl_unlock(); 1750 return PTR_ERR(rx_sc); 1751 } 1752 1753 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1754 1755 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1756 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1757 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1758 rtnl_unlock(); 1759 return -EINVAL; 1760 } 1761 1762 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1763 if (tb_sa[MACSEC_SA_ATTR_PN] && 1764 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1765 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n", 1766 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1767 rtnl_unlock(); 1768 return -EINVAL; 1769 } 1770 1771 if (secy->xpn) { 1772 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 1773 rtnl_unlock(); 1774 return -EINVAL; 1775 } 1776 1777 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 1778 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n", 1779 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 1780 MACSEC_SALT_LEN); 1781 rtnl_unlock(); 1782 return -EINVAL; 1783 } 1784 } 1785 1786 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1787 if (rx_sa) { 1788 rtnl_unlock(); 1789 return -EBUSY; 1790 } 1791 1792 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1793 if (!rx_sa) { 1794 rtnl_unlock(); 1795 return -ENOMEM; 1796 } 1797 1798 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1799 secy->key_len, secy->icv_len); 1800 if (err < 0) { 1801 kfree(rx_sa); 1802 rtnl_unlock(); 1803 return err; 1804 } 1805 1806 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1807 spin_lock_bh(&rx_sa->lock); 1808 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 1809 spin_unlock_bh(&rx_sa->lock); 1810 } 1811 1812 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1813 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1814 1815 rx_sa->sc = rx_sc; 1816 1817 if (secy->xpn) { 1818 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 1819 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 1820 MACSEC_SALT_LEN); 1821 } 1822 1823 /* If h/w offloading is available, propagate to the device */ 1824 if (macsec_is_offloaded(netdev_priv(dev))) { 1825 const struct macsec_ops *ops; 1826 struct macsec_context ctx; 1827 1828 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1829 if (!ops) { 1830 err = -EOPNOTSUPP; 1831 goto cleanup; 1832 } 1833 1834 ctx.sa.assoc_num = assoc_num; 1835 ctx.sa.rx_sa = rx_sa; 1836 ctx.secy = secy; 1837 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1838 secy->key_len); 1839 1840 err = macsec_offload(ops->mdo_add_rxsa, &ctx); 1841 if (err) 1842 goto cleanup; 1843 } 1844 1845 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1846 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1847 1848 rtnl_unlock(); 1849 1850 return 0; 1851 1852 cleanup: 1853 macsec_rxsa_put(rx_sa); 1854 rtnl_unlock(); 1855 return err; 1856 } 1857 1858 static bool validate_add_rxsc(struct nlattr **attrs) 1859 { 1860 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1861 return false; 1862 1863 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1864 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1865 return false; 1866 } 1867 1868 return true; 1869 } 1870 1871 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1872 { 1873 struct net_device *dev; 1874 sci_t sci = MACSEC_UNDEF_SCI; 1875 struct nlattr **attrs = info->attrs; 1876 struct macsec_rx_sc *rx_sc; 1877 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1878 struct macsec_secy *secy; 1879 bool was_active; 1880 int ret; 1881 1882 if (!attrs[MACSEC_ATTR_IFINDEX]) 1883 return -EINVAL; 1884 1885 if (parse_rxsc_config(attrs, tb_rxsc)) 1886 return -EINVAL; 1887 1888 if (!validate_add_rxsc(tb_rxsc)) 1889 return -EINVAL; 1890 1891 rtnl_lock(); 1892 dev = get_dev_from_nl(genl_info_net(info), attrs); 1893 if (IS_ERR(dev)) { 1894 rtnl_unlock(); 1895 return PTR_ERR(dev); 1896 } 1897 1898 secy = &macsec_priv(dev)->secy; 1899 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1900 1901 rx_sc = create_rx_sc(dev, sci); 1902 if (IS_ERR(rx_sc)) { 1903 rtnl_unlock(); 1904 return PTR_ERR(rx_sc); 1905 } 1906 1907 was_active = rx_sc->active; 1908 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1909 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1910 1911 if (macsec_is_offloaded(netdev_priv(dev))) { 1912 const struct macsec_ops *ops; 1913 struct macsec_context ctx; 1914 1915 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1916 if (!ops) { 1917 ret = -EOPNOTSUPP; 1918 goto cleanup; 1919 } 1920 1921 ctx.rx_sc = rx_sc; 1922 ctx.secy = secy; 1923 1924 ret = macsec_offload(ops->mdo_add_rxsc, &ctx); 1925 if (ret) 1926 goto cleanup; 1927 } 1928 1929 rtnl_unlock(); 1930 1931 return 0; 1932 1933 cleanup: 1934 rx_sc->active = was_active; 1935 rtnl_unlock(); 1936 return ret; 1937 } 1938 1939 static bool validate_add_txsa(struct nlattr **attrs) 1940 { 1941 if (!attrs[MACSEC_SA_ATTR_AN] || 1942 !attrs[MACSEC_SA_ATTR_PN] || 1943 !attrs[MACSEC_SA_ATTR_KEY] || 1944 !attrs[MACSEC_SA_ATTR_KEYID]) 1945 return false; 1946 1947 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1948 return false; 1949 1950 if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 1951 return false; 1952 1953 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1954 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1955 return false; 1956 } 1957 1958 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1959 return false; 1960 1961 return true; 1962 } 1963 1964 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1965 { 1966 struct net_device *dev; 1967 struct nlattr **attrs = info->attrs; 1968 struct macsec_secy *secy; 1969 struct macsec_tx_sc *tx_sc; 1970 struct macsec_tx_sa *tx_sa; 1971 unsigned char assoc_num; 1972 int pn_len; 1973 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1974 bool was_operational; 1975 int err; 1976 1977 if (!attrs[MACSEC_ATTR_IFINDEX]) 1978 return -EINVAL; 1979 1980 if (parse_sa_config(attrs, tb_sa)) 1981 return -EINVAL; 1982 1983 if (!validate_add_txsa(tb_sa)) 1984 return -EINVAL; 1985 1986 rtnl_lock(); 1987 dev = get_dev_from_nl(genl_info_net(info), attrs); 1988 if (IS_ERR(dev)) { 1989 rtnl_unlock(); 1990 return PTR_ERR(dev); 1991 } 1992 1993 secy = &macsec_priv(dev)->secy; 1994 tx_sc = &secy->tx_sc; 1995 1996 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1997 1998 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1999 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 2000 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 2001 rtnl_unlock(); 2002 return -EINVAL; 2003 } 2004 2005 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2006 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2007 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n", 2008 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2009 rtnl_unlock(); 2010 return -EINVAL; 2011 } 2012 2013 if (secy->xpn) { 2014 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 2015 rtnl_unlock(); 2016 return -EINVAL; 2017 } 2018 2019 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 2020 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n", 2021 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 2022 MACSEC_SALT_LEN); 2023 rtnl_unlock(); 2024 return -EINVAL; 2025 } 2026 } 2027 2028 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 2029 if (tx_sa) { 2030 rtnl_unlock(); 2031 return -EBUSY; 2032 } 2033 2034 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 2035 if (!tx_sa) { 2036 rtnl_unlock(); 2037 return -ENOMEM; 2038 } 2039 2040 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2041 secy->key_len, secy->icv_len); 2042 if (err < 0) { 2043 kfree(tx_sa); 2044 rtnl_unlock(); 2045 return err; 2046 } 2047 2048 spin_lock_bh(&tx_sa->lock); 2049 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2050 spin_unlock_bh(&tx_sa->lock); 2051 2052 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2053 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2054 2055 was_operational = secy->operational; 2056 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 2057 secy->operational = true; 2058 2059 if (secy->xpn) { 2060 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 2061 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 2062 MACSEC_SALT_LEN); 2063 } 2064 2065 /* If h/w offloading is available, propagate to the device */ 2066 if (macsec_is_offloaded(netdev_priv(dev))) { 2067 const struct macsec_ops *ops; 2068 struct macsec_context ctx; 2069 2070 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2071 if (!ops) { 2072 err = -EOPNOTSUPP; 2073 goto cleanup; 2074 } 2075 2076 ctx.sa.assoc_num = assoc_num; 2077 ctx.sa.tx_sa = tx_sa; 2078 ctx.secy = secy; 2079 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2080 secy->key_len); 2081 2082 err = macsec_offload(ops->mdo_add_txsa, &ctx); 2083 if (err) 2084 goto cleanup; 2085 } 2086 2087 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 2088 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 2089 2090 rtnl_unlock(); 2091 2092 return 0; 2093 2094 cleanup: 2095 secy->operational = was_operational; 2096 macsec_txsa_put(tx_sa); 2097 rtnl_unlock(); 2098 return err; 2099 } 2100 2101 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 2102 { 2103 struct nlattr **attrs = info->attrs; 2104 struct net_device *dev; 2105 struct macsec_secy *secy; 2106 struct macsec_rx_sc *rx_sc; 2107 struct macsec_rx_sa *rx_sa; 2108 u8 assoc_num; 2109 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2110 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2111 int ret; 2112 2113 if (!attrs[MACSEC_ATTR_IFINDEX]) 2114 return -EINVAL; 2115 2116 if (parse_sa_config(attrs, tb_sa)) 2117 return -EINVAL; 2118 2119 if (parse_rxsc_config(attrs, tb_rxsc)) 2120 return -EINVAL; 2121 2122 rtnl_lock(); 2123 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2124 &dev, &secy, &rx_sc, &assoc_num); 2125 if (IS_ERR(rx_sa)) { 2126 rtnl_unlock(); 2127 return PTR_ERR(rx_sa); 2128 } 2129 2130 if (rx_sa->active) { 2131 rtnl_unlock(); 2132 return -EBUSY; 2133 } 2134 2135 /* If h/w offloading is available, propagate to the device */ 2136 if (macsec_is_offloaded(netdev_priv(dev))) { 2137 const struct macsec_ops *ops; 2138 struct macsec_context ctx; 2139 2140 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2141 if (!ops) { 2142 ret = -EOPNOTSUPP; 2143 goto cleanup; 2144 } 2145 2146 ctx.sa.assoc_num = assoc_num; 2147 ctx.sa.rx_sa = rx_sa; 2148 ctx.secy = secy; 2149 2150 ret = macsec_offload(ops->mdo_del_rxsa, &ctx); 2151 if (ret) 2152 goto cleanup; 2153 } 2154 2155 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 2156 clear_rx_sa(rx_sa); 2157 2158 rtnl_unlock(); 2159 2160 return 0; 2161 2162 cleanup: 2163 rtnl_unlock(); 2164 return ret; 2165 } 2166 2167 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 2168 { 2169 struct nlattr **attrs = info->attrs; 2170 struct net_device *dev; 2171 struct macsec_secy *secy; 2172 struct macsec_rx_sc *rx_sc; 2173 sci_t sci; 2174 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2175 int ret; 2176 2177 if (!attrs[MACSEC_ATTR_IFINDEX]) 2178 return -EINVAL; 2179 2180 if (parse_rxsc_config(attrs, tb_rxsc)) 2181 return -EINVAL; 2182 2183 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 2184 return -EINVAL; 2185 2186 rtnl_lock(); 2187 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 2188 if (IS_ERR(dev)) { 2189 rtnl_unlock(); 2190 return PTR_ERR(dev); 2191 } 2192 2193 secy = &macsec_priv(dev)->secy; 2194 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 2195 2196 rx_sc = del_rx_sc(secy, sci); 2197 if (!rx_sc) { 2198 rtnl_unlock(); 2199 return -ENODEV; 2200 } 2201 2202 /* If h/w offloading is available, propagate to the device */ 2203 if (macsec_is_offloaded(netdev_priv(dev))) { 2204 const struct macsec_ops *ops; 2205 struct macsec_context ctx; 2206 2207 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2208 if (!ops) { 2209 ret = -EOPNOTSUPP; 2210 goto cleanup; 2211 } 2212 2213 ctx.rx_sc = rx_sc; 2214 ctx.secy = secy; 2215 ret = macsec_offload(ops->mdo_del_rxsc, &ctx); 2216 if (ret) 2217 goto cleanup; 2218 } 2219 2220 free_rx_sc(rx_sc); 2221 rtnl_unlock(); 2222 2223 return 0; 2224 2225 cleanup: 2226 rtnl_unlock(); 2227 return ret; 2228 } 2229 2230 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 2231 { 2232 struct nlattr **attrs = info->attrs; 2233 struct net_device *dev; 2234 struct macsec_secy *secy; 2235 struct macsec_tx_sc *tx_sc; 2236 struct macsec_tx_sa *tx_sa; 2237 u8 assoc_num; 2238 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2239 int ret; 2240 2241 if (!attrs[MACSEC_ATTR_IFINDEX]) 2242 return -EINVAL; 2243 2244 if (parse_sa_config(attrs, tb_sa)) 2245 return -EINVAL; 2246 2247 rtnl_lock(); 2248 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2249 &dev, &secy, &tx_sc, &assoc_num); 2250 if (IS_ERR(tx_sa)) { 2251 rtnl_unlock(); 2252 return PTR_ERR(tx_sa); 2253 } 2254 2255 if (tx_sa->active) { 2256 rtnl_unlock(); 2257 return -EBUSY; 2258 } 2259 2260 /* If h/w offloading is available, propagate to the device */ 2261 if (macsec_is_offloaded(netdev_priv(dev))) { 2262 const struct macsec_ops *ops; 2263 struct macsec_context ctx; 2264 2265 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2266 if (!ops) { 2267 ret = -EOPNOTSUPP; 2268 goto cleanup; 2269 } 2270 2271 ctx.sa.assoc_num = assoc_num; 2272 ctx.sa.tx_sa = tx_sa; 2273 ctx.secy = secy; 2274 2275 ret = macsec_offload(ops->mdo_del_txsa, &ctx); 2276 if (ret) 2277 goto cleanup; 2278 } 2279 2280 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 2281 clear_tx_sa(tx_sa); 2282 2283 rtnl_unlock(); 2284 2285 return 0; 2286 2287 cleanup: 2288 rtnl_unlock(); 2289 return ret; 2290 } 2291 2292 static bool validate_upd_sa(struct nlattr **attrs) 2293 { 2294 if (!attrs[MACSEC_SA_ATTR_AN] || 2295 attrs[MACSEC_SA_ATTR_KEY] || 2296 attrs[MACSEC_SA_ATTR_KEYID] || 2297 attrs[MACSEC_SA_ATTR_SSCI] || 2298 attrs[MACSEC_SA_ATTR_SALT]) 2299 return false; 2300 2301 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 2302 return false; 2303 2304 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 2305 return false; 2306 2307 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 2308 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 2309 return false; 2310 } 2311 2312 return true; 2313 } 2314 2315 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2316 { 2317 struct nlattr **attrs = info->attrs; 2318 struct net_device *dev; 2319 struct macsec_secy *secy; 2320 struct macsec_tx_sc *tx_sc; 2321 struct macsec_tx_sa *tx_sa; 2322 u8 assoc_num; 2323 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2324 bool was_operational, was_active; 2325 pn_t prev_pn; 2326 int ret = 0; 2327 2328 prev_pn.full64 = 0; 2329 2330 if (!attrs[MACSEC_ATTR_IFINDEX]) 2331 return -EINVAL; 2332 2333 if (parse_sa_config(attrs, tb_sa)) 2334 return -EINVAL; 2335 2336 if (!validate_upd_sa(tb_sa)) 2337 return -EINVAL; 2338 2339 rtnl_lock(); 2340 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2341 &dev, &secy, &tx_sc, &assoc_num); 2342 if (IS_ERR(tx_sa)) { 2343 rtnl_unlock(); 2344 return PTR_ERR(tx_sa); 2345 } 2346 2347 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2348 int pn_len; 2349 2350 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2351 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2352 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n", 2353 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2354 rtnl_unlock(); 2355 return -EINVAL; 2356 } 2357 2358 spin_lock_bh(&tx_sa->lock); 2359 prev_pn = tx_sa->next_pn_halves; 2360 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2361 spin_unlock_bh(&tx_sa->lock); 2362 } 2363 2364 was_active = tx_sa->active; 2365 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2366 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2367 2368 was_operational = secy->operational; 2369 if (assoc_num == tx_sc->encoding_sa) 2370 secy->operational = tx_sa->active; 2371 2372 /* If h/w offloading is available, propagate to the device */ 2373 if (macsec_is_offloaded(netdev_priv(dev))) { 2374 const struct macsec_ops *ops; 2375 struct macsec_context ctx; 2376 2377 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2378 if (!ops) { 2379 ret = -EOPNOTSUPP; 2380 goto cleanup; 2381 } 2382 2383 ctx.sa.assoc_num = assoc_num; 2384 ctx.sa.tx_sa = tx_sa; 2385 ctx.secy = secy; 2386 2387 ret = macsec_offload(ops->mdo_upd_txsa, &ctx); 2388 if (ret) 2389 goto cleanup; 2390 } 2391 2392 rtnl_unlock(); 2393 2394 return 0; 2395 2396 cleanup: 2397 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2398 spin_lock_bh(&tx_sa->lock); 2399 tx_sa->next_pn_halves = prev_pn; 2400 spin_unlock_bh(&tx_sa->lock); 2401 } 2402 tx_sa->active = was_active; 2403 secy->operational = was_operational; 2404 rtnl_unlock(); 2405 return ret; 2406 } 2407 2408 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2409 { 2410 struct nlattr **attrs = info->attrs; 2411 struct net_device *dev; 2412 struct macsec_secy *secy; 2413 struct macsec_rx_sc *rx_sc; 2414 struct macsec_rx_sa *rx_sa; 2415 u8 assoc_num; 2416 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2417 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2418 bool was_active; 2419 pn_t prev_pn; 2420 int ret = 0; 2421 2422 prev_pn.full64 = 0; 2423 2424 if (!attrs[MACSEC_ATTR_IFINDEX]) 2425 return -EINVAL; 2426 2427 if (parse_rxsc_config(attrs, tb_rxsc)) 2428 return -EINVAL; 2429 2430 if (parse_sa_config(attrs, tb_sa)) 2431 return -EINVAL; 2432 2433 if (!validate_upd_sa(tb_sa)) 2434 return -EINVAL; 2435 2436 rtnl_lock(); 2437 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2438 &dev, &secy, &rx_sc, &assoc_num); 2439 if (IS_ERR(rx_sa)) { 2440 rtnl_unlock(); 2441 return PTR_ERR(rx_sa); 2442 } 2443 2444 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2445 int pn_len; 2446 2447 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2448 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2449 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n", 2450 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2451 rtnl_unlock(); 2452 return -EINVAL; 2453 } 2454 2455 spin_lock_bh(&rx_sa->lock); 2456 prev_pn = rx_sa->next_pn_halves; 2457 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2458 spin_unlock_bh(&rx_sa->lock); 2459 } 2460 2461 was_active = rx_sa->active; 2462 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2463 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2464 2465 /* If h/w offloading is available, propagate to the device */ 2466 if (macsec_is_offloaded(netdev_priv(dev))) { 2467 const struct macsec_ops *ops; 2468 struct macsec_context ctx; 2469 2470 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2471 if (!ops) { 2472 ret = -EOPNOTSUPP; 2473 goto cleanup; 2474 } 2475 2476 ctx.sa.assoc_num = assoc_num; 2477 ctx.sa.rx_sa = rx_sa; 2478 ctx.secy = secy; 2479 2480 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx); 2481 if (ret) 2482 goto cleanup; 2483 } 2484 2485 rtnl_unlock(); 2486 return 0; 2487 2488 cleanup: 2489 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2490 spin_lock_bh(&rx_sa->lock); 2491 rx_sa->next_pn_halves = prev_pn; 2492 spin_unlock_bh(&rx_sa->lock); 2493 } 2494 rx_sa->active = was_active; 2495 rtnl_unlock(); 2496 return ret; 2497 } 2498 2499 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2500 { 2501 struct nlattr **attrs = info->attrs; 2502 struct net_device *dev; 2503 struct macsec_secy *secy; 2504 struct macsec_rx_sc *rx_sc; 2505 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2506 unsigned int prev_n_rx_sc; 2507 bool was_active; 2508 int ret; 2509 2510 if (!attrs[MACSEC_ATTR_IFINDEX]) 2511 return -EINVAL; 2512 2513 if (parse_rxsc_config(attrs, tb_rxsc)) 2514 return -EINVAL; 2515 2516 if (!validate_add_rxsc(tb_rxsc)) 2517 return -EINVAL; 2518 2519 rtnl_lock(); 2520 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2521 if (IS_ERR(rx_sc)) { 2522 rtnl_unlock(); 2523 return PTR_ERR(rx_sc); 2524 } 2525 2526 was_active = rx_sc->active; 2527 prev_n_rx_sc = secy->n_rx_sc; 2528 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2529 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2530 2531 if (rx_sc->active != new) 2532 secy->n_rx_sc += new ? 1 : -1; 2533 2534 rx_sc->active = new; 2535 } 2536 2537 /* If h/w offloading is available, propagate to the device */ 2538 if (macsec_is_offloaded(netdev_priv(dev))) { 2539 const struct macsec_ops *ops; 2540 struct macsec_context ctx; 2541 2542 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2543 if (!ops) { 2544 ret = -EOPNOTSUPP; 2545 goto cleanup; 2546 } 2547 2548 ctx.rx_sc = rx_sc; 2549 ctx.secy = secy; 2550 2551 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx); 2552 if (ret) 2553 goto cleanup; 2554 } 2555 2556 rtnl_unlock(); 2557 2558 return 0; 2559 2560 cleanup: 2561 secy->n_rx_sc = prev_n_rx_sc; 2562 rx_sc->active = was_active; 2563 rtnl_unlock(); 2564 return ret; 2565 } 2566 2567 static bool macsec_is_configured(struct macsec_dev *macsec) 2568 { 2569 struct macsec_secy *secy = &macsec->secy; 2570 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2571 int i; 2572 2573 if (secy->n_rx_sc > 0) 2574 return true; 2575 2576 for (i = 0; i < MACSEC_NUM_AN; i++) 2577 if (tx_sc->sa[i]) 2578 return true; 2579 2580 return false; 2581 } 2582 2583 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info) 2584 { 2585 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1]; 2586 enum macsec_offload offload, prev_offload; 2587 int (*func)(struct macsec_context *ctx); 2588 struct nlattr **attrs = info->attrs; 2589 struct net_device *dev; 2590 const struct macsec_ops *ops; 2591 struct macsec_context ctx; 2592 struct macsec_dev *macsec; 2593 int ret; 2594 2595 if (!attrs[MACSEC_ATTR_IFINDEX]) 2596 return -EINVAL; 2597 2598 if (!attrs[MACSEC_ATTR_OFFLOAD]) 2599 return -EINVAL; 2600 2601 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX, 2602 attrs[MACSEC_ATTR_OFFLOAD], 2603 macsec_genl_offload_policy, NULL)) 2604 return -EINVAL; 2605 2606 dev = get_dev_from_nl(genl_info_net(info), attrs); 2607 if (IS_ERR(dev)) 2608 return PTR_ERR(dev); 2609 macsec = macsec_priv(dev); 2610 2611 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) 2612 return -EINVAL; 2613 2614 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]); 2615 if (macsec->offload == offload) 2616 return 0; 2617 2618 /* Check if the offloading mode is supported by the underlying layers */ 2619 if (offload != MACSEC_OFFLOAD_OFF && 2620 !macsec_check_offload(offload, macsec)) 2621 return -EOPNOTSUPP; 2622 2623 /* Check if the net device is busy. */ 2624 if (netif_running(dev)) 2625 return -EBUSY; 2626 2627 rtnl_lock(); 2628 2629 prev_offload = macsec->offload; 2630 macsec->offload = offload; 2631 2632 /* Check if the device already has rules configured: we do not support 2633 * rules migration. 2634 */ 2635 if (macsec_is_configured(macsec)) { 2636 ret = -EBUSY; 2637 goto rollback; 2638 } 2639 2640 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload, 2641 macsec, &ctx); 2642 if (!ops) { 2643 ret = -EOPNOTSUPP; 2644 goto rollback; 2645 } 2646 2647 if (prev_offload == MACSEC_OFFLOAD_OFF) 2648 func = ops->mdo_add_secy; 2649 else 2650 func = ops->mdo_del_secy; 2651 2652 ctx.secy = &macsec->secy; 2653 ret = macsec_offload(func, &ctx); 2654 if (ret) 2655 goto rollback; 2656 2657 /* Force features update, since they are different for SW MACSec and 2658 * HW offloading cases. 2659 */ 2660 netdev_update_features(dev); 2661 2662 rtnl_unlock(); 2663 return 0; 2664 2665 rollback: 2666 macsec->offload = prev_offload; 2667 2668 rtnl_unlock(); 2669 return ret; 2670 } 2671 2672 static void get_tx_sa_stats(struct net_device *dev, int an, 2673 struct macsec_tx_sa *tx_sa, 2674 struct macsec_tx_sa_stats *sum) 2675 { 2676 struct macsec_dev *macsec = macsec_priv(dev); 2677 int cpu; 2678 2679 /* If h/w offloading is available, propagate to the device */ 2680 if (macsec_is_offloaded(macsec)) { 2681 const struct macsec_ops *ops; 2682 struct macsec_context ctx; 2683 2684 ops = macsec_get_ops(macsec, &ctx); 2685 if (ops) { 2686 ctx.sa.assoc_num = an; 2687 ctx.sa.tx_sa = tx_sa; 2688 ctx.stats.tx_sa_stats = sum; 2689 ctx.secy = &macsec_priv(dev)->secy; 2690 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx); 2691 } 2692 return; 2693 } 2694 2695 for_each_possible_cpu(cpu) { 2696 const struct macsec_tx_sa_stats *stats = 2697 per_cpu_ptr(tx_sa->stats, cpu); 2698 2699 sum->OutPktsProtected += stats->OutPktsProtected; 2700 sum->OutPktsEncrypted += stats->OutPktsEncrypted; 2701 } 2702 } 2703 2704 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum) 2705 { 2706 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, 2707 sum->OutPktsProtected) || 2708 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2709 sum->OutPktsEncrypted)) 2710 return -EMSGSIZE; 2711 2712 return 0; 2713 } 2714 2715 static void get_rx_sa_stats(struct net_device *dev, 2716 struct macsec_rx_sc *rx_sc, int an, 2717 struct macsec_rx_sa *rx_sa, 2718 struct macsec_rx_sa_stats *sum) 2719 { 2720 struct macsec_dev *macsec = macsec_priv(dev); 2721 int cpu; 2722 2723 /* If h/w offloading is available, propagate to the device */ 2724 if (macsec_is_offloaded(macsec)) { 2725 const struct macsec_ops *ops; 2726 struct macsec_context ctx; 2727 2728 ops = macsec_get_ops(macsec, &ctx); 2729 if (ops) { 2730 ctx.sa.assoc_num = an; 2731 ctx.sa.rx_sa = rx_sa; 2732 ctx.stats.rx_sa_stats = sum; 2733 ctx.secy = &macsec_priv(dev)->secy; 2734 ctx.rx_sc = rx_sc; 2735 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx); 2736 } 2737 return; 2738 } 2739 2740 for_each_possible_cpu(cpu) { 2741 const struct macsec_rx_sa_stats *stats = 2742 per_cpu_ptr(rx_sa->stats, cpu); 2743 2744 sum->InPktsOK += stats->InPktsOK; 2745 sum->InPktsInvalid += stats->InPktsInvalid; 2746 sum->InPktsNotValid += stats->InPktsNotValid; 2747 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA; 2748 sum->InPktsUnusedSA += stats->InPktsUnusedSA; 2749 } 2750 } 2751 2752 static int copy_rx_sa_stats(struct sk_buff *skb, 2753 struct macsec_rx_sa_stats *sum) 2754 { 2755 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) || 2756 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, 2757 sum->InPktsInvalid) || 2758 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, 2759 sum->InPktsNotValid) || 2760 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2761 sum->InPktsNotUsingSA) || 2762 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, 2763 sum->InPktsUnusedSA)) 2764 return -EMSGSIZE; 2765 2766 return 0; 2767 } 2768 2769 static void get_rx_sc_stats(struct net_device *dev, 2770 struct macsec_rx_sc *rx_sc, 2771 struct macsec_rx_sc_stats *sum) 2772 { 2773 struct macsec_dev *macsec = macsec_priv(dev); 2774 int cpu; 2775 2776 /* If h/w offloading is available, propagate to the device */ 2777 if (macsec_is_offloaded(macsec)) { 2778 const struct macsec_ops *ops; 2779 struct macsec_context ctx; 2780 2781 ops = macsec_get_ops(macsec, &ctx); 2782 if (ops) { 2783 ctx.stats.rx_sc_stats = sum; 2784 ctx.secy = &macsec_priv(dev)->secy; 2785 ctx.rx_sc = rx_sc; 2786 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx); 2787 } 2788 return; 2789 } 2790 2791 for_each_possible_cpu(cpu) { 2792 const struct pcpu_rx_sc_stats *stats; 2793 struct macsec_rx_sc_stats tmp; 2794 unsigned int start; 2795 2796 stats = per_cpu_ptr(rx_sc->stats, cpu); 2797 do { 2798 start = u64_stats_fetch_begin_irq(&stats->syncp); 2799 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2800 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2801 2802 sum->InOctetsValidated += tmp.InOctetsValidated; 2803 sum->InOctetsDecrypted += tmp.InOctetsDecrypted; 2804 sum->InPktsUnchecked += tmp.InPktsUnchecked; 2805 sum->InPktsDelayed += tmp.InPktsDelayed; 2806 sum->InPktsOK += tmp.InPktsOK; 2807 sum->InPktsInvalid += tmp.InPktsInvalid; 2808 sum->InPktsLate += tmp.InPktsLate; 2809 sum->InPktsNotValid += tmp.InPktsNotValid; 2810 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2811 sum->InPktsUnusedSA += tmp.InPktsUnusedSA; 2812 } 2813 } 2814 2815 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum) 2816 { 2817 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2818 sum->InOctetsValidated, 2819 MACSEC_RXSC_STATS_ATTR_PAD) || 2820 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2821 sum->InOctetsDecrypted, 2822 MACSEC_RXSC_STATS_ATTR_PAD) || 2823 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2824 sum->InPktsUnchecked, 2825 MACSEC_RXSC_STATS_ATTR_PAD) || 2826 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2827 sum->InPktsDelayed, 2828 MACSEC_RXSC_STATS_ATTR_PAD) || 2829 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2830 sum->InPktsOK, 2831 MACSEC_RXSC_STATS_ATTR_PAD) || 2832 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2833 sum->InPktsInvalid, 2834 MACSEC_RXSC_STATS_ATTR_PAD) || 2835 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2836 sum->InPktsLate, 2837 MACSEC_RXSC_STATS_ATTR_PAD) || 2838 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2839 sum->InPktsNotValid, 2840 MACSEC_RXSC_STATS_ATTR_PAD) || 2841 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2842 sum->InPktsNotUsingSA, 2843 MACSEC_RXSC_STATS_ATTR_PAD) || 2844 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2845 sum->InPktsUnusedSA, 2846 MACSEC_RXSC_STATS_ATTR_PAD)) 2847 return -EMSGSIZE; 2848 2849 return 0; 2850 } 2851 2852 static void get_tx_sc_stats(struct net_device *dev, 2853 struct macsec_tx_sc_stats *sum) 2854 { 2855 struct macsec_dev *macsec = macsec_priv(dev); 2856 int cpu; 2857 2858 /* If h/w offloading is available, propagate to the device */ 2859 if (macsec_is_offloaded(macsec)) { 2860 const struct macsec_ops *ops; 2861 struct macsec_context ctx; 2862 2863 ops = macsec_get_ops(macsec, &ctx); 2864 if (ops) { 2865 ctx.stats.tx_sc_stats = sum; 2866 ctx.secy = &macsec_priv(dev)->secy; 2867 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx); 2868 } 2869 return; 2870 } 2871 2872 for_each_possible_cpu(cpu) { 2873 const struct pcpu_tx_sc_stats *stats; 2874 struct macsec_tx_sc_stats tmp; 2875 unsigned int start; 2876 2877 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu); 2878 do { 2879 start = u64_stats_fetch_begin_irq(&stats->syncp); 2880 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2881 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2882 2883 sum->OutPktsProtected += tmp.OutPktsProtected; 2884 sum->OutPktsEncrypted += tmp.OutPktsEncrypted; 2885 sum->OutOctetsProtected += tmp.OutOctetsProtected; 2886 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2887 } 2888 } 2889 2890 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum) 2891 { 2892 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2893 sum->OutPktsProtected, 2894 MACSEC_TXSC_STATS_ATTR_PAD) || 2895 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2896 sum->OutPktsEncrypted, 2897 MACSEC_TXSC_STATS_ATTR_PAD) || 2898 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2899 sum->OutOctetsProtected, 2900 MACSEC_TXSC_STATS_ATTR_PAD) || 2901 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2902 sum->OutOctetsEncrypted, 2903 MACSEC_TXSC_STATS_ATTR_PAD)) 2904 return -EMSGSIZE; 2905 2906 return 0; 2907 } 2908 2909 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum) 2910 { 2911 struct macsec_dev *macsec = macsec_priv(dev); 2912 int cpu; 2913 2914 /* If h/w offloading is available, propagate to the device */ 2915 if (macsec_is_offloaded(macsec)) { 2916 const struct macsec_ops *ops; 2917 struct macsec_context ctx; 2918 2919 ops = macsec_get_ops(macsec, &ctx); 2920 if (ops) { 2921 ctx.stats.dev_stats = sum; 2922 ctx.secy = &macsec_priv(dev)->secy; 2923 macsec_offload(ops->mdo_get_dev_stats, &ctx); 2924 } 2925 return; 2926 } 2927 2928 for_each_possible_cpu(cpu) { 2929 const struct pcpu_secy_stats *stats; 2930 struct macsec_dev_stats tmp; 2931 unsigned int start; 2932 2933 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu); 2934 do { 2935 start = u64_stats_fetch_begin_irq(&stats->syncp); 2936 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2937 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2938 2939 sum->OutPktsUntagged += tmp.OutPktsUntagged; 2940 sum->InPktsUntagged += tmp.InPktsUntagged; 2941 sum->OutPktsTooLong += tmp.OutPktsTooLong; 2942 sum->InPktsNoTag += tmp.InPktsNoTag; 2943 sum->InPktsBadTag += tmp.InPktsBadTag; 2944 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2945 sum->InPktsNoSCI += tmp.InPktsNoSCI; 2946 sum->InPktsOverrun += tmp.InPktsOverrun; 2947 } 2948 } 2949 2950 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum) 2951 { 2952 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 2953 sum->OutPktsUntagged, 2954 MACSEC_SECY_STATS_ATTR_PAD) || 2955 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 2956 sum->InPktsUntagged, 2957 MACSEC_SECY_STATS_ATTR_PAD) || 2958 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 2959 sum->OutPktsTooLong, 2960 MACSEC_SECY_STATS_ATTR_PAD) || 2961 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 2962 sum->InPktsNoTag, 2963 MACSEC_SECY_STATS_ATTR_PAD) || 2964 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 2965 sum->InPktsBadTag, 2966 MACSEC_SECY_STATS_ATTR_PAD) || 2967 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 2968 sum->InPktsUnknownSCI, 2969 MACSEC_SECY_STATS_ATTR_PAD) || 2970 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 2971 sum->InPktsNoSCI, 2972 MACSEC_SECY_STATS_ATTR_PAD) || 2973 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 2974 sum->InPktsOverrun, 2975 MACSEC_SECY_STATS_ATTR_PAD)) 2976 return -EMSGSIZE; 2977 2978 return 0; 2979 } 2980 2981 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 2982 { 2983 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2984 struct nlattr *secy_nest = nla_nest_start_noflag(skb, 2985 MACSEC_ATTR_SECY); 2986 u64 csid; 2987 2988 if (!secy_nest) 2989 return 1; 2990 2991 switch (secy->key_len) { 2992 case MACSEC_GCM_AES_128_SAK_LEN: 2993 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 2994 break; 2995 case MACSEC_GCM_AES_256_SAK_LEN: 2996 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 2997 break; 2998 default: 2999 goto cancel; 3000 } 3001 3002 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 3003 MACSEC_SECY_ATTR_PAD) || 3004 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 3005 csid, MACSEC_SECY_ATTR_PAD) || 3006 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 3007 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 3008 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 3009 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 3010 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 3011 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 3012 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 3013 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 3014 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 3015 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 3016 goto cancel; 3017 3018 if (secy->replay_protect) { 3019 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 3020 goto cancel; 3021 } 3022 3023 nla_nest_end(skb, secy_nest); 3024 return 0; 3025 3026 cancel: 3027 nla_nest_cancel(skb, secy_nest); 3028 return 1; 3029 } 3030 3031 static noinline_for_stack int 3032 dump_secy(struct macsec_secy *secy, struct net_device *dev, 3033 struct sk_buff *skb, struct netlink_callback *cb) 3034 { 3035 struct macsec_tx_sc_stats tx_sc_stats = {0, }; 3036 struct macsec_tx_sa_stats tx_sa_stats = {0, }; 3037 struct macsec_rx_sc_stats rx_sc_stats = {0, }; 3038 struct macsec_rx_sa_stats rx_sa_stats = {0, }; 3039 struct macsec_dev *macsec = netdev_priv(dev); 3040 struct macsec_dev_stats dev_stats = {0, }; 3041 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3042 struct nlattr *txsa_list, *rxsc_list; 3043 struct macsec_rx_sc *rx_sc; 3044 struct nlattr *attr; 3045 void *hdr; 3046 int i, j; 3047 3048 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3049 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 3050 if (!hdr) 3051 return -EMSGSIZE; 3052 3053 genl_dump_check_consistent(cb, hdr); 3054 3055 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 3056 goto nla_put_failure; 3057 3058 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD); 3059 if (!attr) 3060 goto nla_put_failure; 3061 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload)) 3062 goto nla_put_failure; 3063 nla_nest_end(skb, attr); 3064 3065 if (nla_put_secy(secy, skb)) 3066 goto nla_put_failure; 3067 3068 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS); 3069 if (!attr) 3070 goto nla_put_failure; 3071 3072 get_tx_sc_stats(dev, &tx_sc_stats); 3073 if (copy_tx_sc_stats(skb, &tx_sc_stats)) { 3074 nla_nest_cancel(skb, attr); 3075 goto nla_put_failure; 3076 } 3077 nla_nest_end(skb, attr); 3078 3079 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS); 3080 if (!attr) 3081 goto nla_put_failure; 3082 get_secy_stats(dev, &dev_stats); 3083 if (copy_secy_stats(skb, &dev_stats)) { 3084 nla_nest_cancel(skb, attr); 3085 goto nla_put_failure; 3086 } 3087 nla_nest_end(skb, attr); 3088 3089 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST); 3090 if (!txsa_list) 3091 goto nla_put_failure; 3092 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 3093 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 3094 struct nlattr *txsa_nest; 3095 u64 pn; 3096 int pn_len; 3097 3098 if (!tx_sa) 3099 continue; 3100 3101 txsa_nest = nla_nest_start_noflag(skb, j++); 3102 if (!txsa_nest) { 3103 nla_nest_cancel(skb, txsa_list); 3104 goto nla_put_failure; 3105 } 3106 3107 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS); 3108 if (!attr) { 3109 nla_nest_cancel(skb, txsa_nest); 3110 nla_nest_cancel(skb, txsa_list); 3111 goto nla_put_failure; 3112 } 3113 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats)); 3114 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats); 3115 if (copy_tx_sa_stats(skb, &tx_sa_stats)) { 3116 nla_nest_cancel(skb, attr); 3117 nla_nest_cancel(skb, txsa_nest); 3118 nla_nest_cancel(skb, txsa_list); 3119 goto nla_put_failure; 3120 } 3121 nla_nest_end(skb, attr); 3122 3123 if (secy->xpn) { 3124 pn = tx_sa->next_pn; 3125 pn_len = MACSEC_XPN_PN_LEN; 3126 } else { 3127 pn = tx_sa->next_pn_halves.lower; 3128 pn_len = MACSEC_DEFAULT_PN_LEN; 3129 } 3130 3131 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3132 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3133 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 3134 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) || 3135 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 3136 nla_nest_cancel(skb, txsa_nest); 3137 nla_nest_cancel(skb, txsa_list); 3138 goto nla_put_failure; 3139 } 3140 3141 nla_nest_end(skb, txsa_nest); 3142 } 3143 nla_nest_end(skb, txsa_list); 3144 3145 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST); 3146 if (!rxsc_list) 3147 goto nla_put_failure; 3148 3149 j = 1; 3150 for_each_rxsc_rtnl(secy, rx_sc) { 3151 int k; 3152 struct nlattr *rxsa_list; 3153 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++); 3154 3155 if (!rxsc_nest) { 3156 nla_nest_cancel(skb, rxsc_list); 3157 goto nla_put_failure; 3158 } 3159 3160 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 3161 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 3162 MACSEC_RXSC_ATTR_PAD)) { 3163 nla_nest_cancel(skb, rxsc_nest); 3164 nla_nest_cancel(skb, rxsc_list); 3165 goto nla_put_failure; 3166 } 3167 3168 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS); 3169 if (!attr) { 3170 nla_nest_cancel(skb, rxsc_nest); 3171 nla_nest_cancel(skb, rxsc_list); 3172 goto nla_put_failure; 3173 } 3174 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats)); 3175 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats); 3176 if (copy_rx_sc_stats(skb, &rx_sc_stats)) { 3177 nla_nest_cancel(skb, attr); 3178 nla_nest_cancel(skb, rxsc_nest); 3179 nla_nest_cancel(skb, rxsc_list); 3180 goto nla_put_failure; 3181 } 3182 nla_nest_end(skb, attr); 3183 3184 rxsa_list = nla_nest_start_noflag(skb, 3185 MACSEC_RXSC_ATTR_SA_LIST); 3186 if (!rxsa_list) { 3187 nla_nest_cancel(skb, rxsc_nest); 3188 nla_nest_cancel(skb, rxsc_list); 3189 goto nla_put_failure; 3190 } 3191 3192 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 3193 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 3194 struct nlattr *rxsa_nest; 3195 u64 pn; 3196 int pn_len; 3197 3198 if (!rx_sa) 3199 continue; 3200 3201 rxsa_nest = nla_nest_start_noflag(skb, k++); 3202 if (!rxsa_nest) { 3203 nla_nest_cancel(skb, rxsa_list); 3204 nla_nest_cancel(skb, rxsc_nest); 3205 nla_nest_cancel(skb, rxsc_list); 3206 goto nla_put_failure; 3207 } 3208 3209 attr = nla_nest_start_noflag(skb, 3210 MACSEC_SA_ATTR_STATS); 3211 if (!attr) { 3212 nla_nest_cancel(skb, rxsa_list); 3213 nla_nest_cancel(skb, rxsc_nest); 3214 nla_nest_cancel(skb, rxsc_list); 3215 goto nla_put_failure; 3216 } 3217 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats)); 3218 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats); 3219 if (copy_rx_sa_stats(skb, &rx_sa_stats)) { 3220 nla_nest_cancel(skb, attr); 3221 nla_nest_cancel(skb, rxsa_list); 3222 nla_nest_cancel(skb, rxsc_nest); 3223 nla_nest_cancel(skb, rxsc_list); 3224 goto nla_put_failure; 3225 } 3226 nla_nest_end(skb, attr); 3227 3228 if (secy->xpn) { 3229 pn = rx_sa->next_pn; 3230 pn_len = MACSEC_XPN_PN_LEN; 3231 } else { 3232 pn = rx_sa->next_pn_halves.lower; 3233 pn_len = MACSEC_DEFAULT_PN_LEN; 3234 } 3235 3236 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3237 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3238 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 3239 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) || 3240 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 3241 nla_nest_cancel(skb, rxsa_nest); 3242 nla_nest_cancel(skb, rxsc_nest); 3243 nla_nest_cancel(skb, rxsc_list); 3244 goto nla_put_failure; 3245 } 3246 nla_nest_end(skb, rxsa_nest); 3247 } 3248 3249 nla_nest_end(skb, rxsa_list); 3250 nla_nest_end(skb, rxsc_nest); 3251 } 3252 3253 nla_nest_end(skb, rxsc_list); 3254 3255 genlmsg_end(skb, hdr); 3256 3257 return 0; 3258 3259 nla_put_failure: 3260 genlmsg_cancel(skb, hdr); 3261 return -EMSGSIZE; 3262 } 3263 3264 static int macsec_generation = 1; /* protected by RTNL */ 3265 3266 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 3267 { 3268 struct net *net = sock_net(skb->sk); 3269 struct net_device *dev; 3270 int dev_idx, d; 3271 3272 dev_idx = cb->args[0]; 3273 3274 d = 0; 3275 rtnl_lock(); 3276 3277 cb->seq = macsec_generation; 3278 3279 for_each_netdev(net, dev) { 3280 struct macsec_secy *secy; 3281 3282 if (d < dev_idx) 3283 goto next; 3284 3285 if (!netif_is_macsec(dev)) 3286 goto next; 3287 3288 secy = &macsec_priv(dev)->secy; 3289 if (dump_secy(secy, dev, skb, cb) < 0) 3290 goto done; 3291 next: 3292 d++; 3293 } 3294 3295 done: 3296 rtnl_unlock(); 3297 cb->args[0] = d; 3298 return skb->len; 3299 } 3300 3301 static const struct genl_small_ops macsec_genl_ops[] = { 3302 { 3303 .cmd = MACSEC_CMD_GET_TXSC, 3304 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3305 .dumpit = macsec_dump_txsc, 3306 }, 3307 { 3308 .cmd = MACSEC_CMD_ADD_RXSC, 3309 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3310 .doit = macsec_add_rxsc, 3311 .flags = GENL_ADMIN_PERM, 3312 }, 3313 { 3314 .cmd = MACSEC_CMD_DEL_RXSC, 3315 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3316 .doit = macsec_del_rxsc, 3317 .flags = GENL_ADMIN_PERM, 3318 }, 3319 { 3320 .cmd = MACSEC_CMD_UPD_RXSC, 3321 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3322 .doit = macsec_upd_rxsc, 3323 .flags = GENL_ADMIN_PERM, 3324 }, 3325 { 3326 .cmd = MACSEC_CMD_ADD_TXSA, 3327 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3328 .doit = macsec_add_txsa, 3329 .flags = GENL_ADMIN_PERM, 3330 }, 3331 { 3332 .cmd = MACSEC_CMD_DEL_TXSA, 3333 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3334 .doit = macsec_del_txsa, 3335 .flags = GENL_ADMIN_PERM, 3336 }, 3337 { 3338 .cmd = MACSEC_CMD_UPD_TXSA, 3339 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3340 .doit = macsec_upd_txsa, 3341 .flags = GENL_ADMIN_PERM, 3342 }, 3343 { 3344 .cmd = MACSEC_CMD_ADD_RXSA, 3345 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3346 .doit = macsec_add_rxsa, 3347 .flags = GENL_ADMIN_PERM, 3348 }, 3349 { 3350 .cmd = MACSEC_CMD_DEL_RXSA, 3351 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3352 .doit = macsec_del_rxsa, 3353 .flags = GENL_ADMIN_PERM, 3354 }, 3355 { 3356 .cmd = MACSEC_CMD_UPD_RXSA, 3357 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3358 .doit = macsec_upd_rxsa, 3359 .flags = GENL_ADMIN_PERM, 3360 }, 3361 { 3362 .cmd = MACSEC_CMD_UPD_OFFLOAD, 3363 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3364 .doit = macsec_upd_offload, 3365 .flags = GENL_ADMIN_PERM, 3366 }, 3367 }; 3368 3369 static struct genl_family macsec_fam __ro_after_init = { 3370 .name = MACSEC_GENL_NAME, 3371 .hdrsize = 0, 3372 .version = MACSEC_GENL_VERSION, 3373 .maxattr = MACSEC_ATTR_MAX, 3374 .policy = macsec_genl_policy, 3375 .netnsok = true, 3376 .module = THIS_MODULE, 3377 .small_ops = macsec_genl_ops, 3378 .n_small_ops = ARRAY_SIZE(macsec_genl_ops), 3379 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1, 3380 }; 3381 3382 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 3383 struct net_device *dev) 3384 { 3385 struct macsec_dev *macsec = netdev_priv(dev); 3386 struct macsec_secy *secy = &macsec->secy; 3387 struct pcpu_secy_stats *secy_stats; 3388 int ret, len; 3389 3390 if (macsec_is_offloaded(netdev_priv(dev))) { 3391 struct metadata_dst *md_dst = secy->tx_sc.md_dst; 3392 3393 skb_dst_drop(skb); 3394 dst_hold(&md_dst->dst); 3395 skb_dst_set(skb, &md_dst->dst); 3396 skb->dev = macsec->real_dev; 3397 return dev_queue_xmit(skb); 3398 } 3399 3400 /* 10.5 */ 3401 if (!secy->protect_frames) { 3402 secy_stats = this_cpu_ptr(macsec->stats); 3403 u64_stats_update_begin(&secy_stats->syncp); 3404 secy_stats->stats.OutPktsUntagged++; 3405 u64_stats_update_end(&secy_stats->syncp); 3406 skb->dev = macsec->real_dev; 3407 len = skb->len; 3408 ret = dev_queue_xmit(skb); 3409 count_tx(dev, ret, len); 3410 return ret; 3411 } 3412 3413 if (!secy->operational) { 3414 kfree_skb(skb); 3415 dev->stats.tx_dropped++; 3416 return NETDEV_TX_OK; 3417 } 3418 3419 len = skb->len; 3420 skb = macsec_encrypt(skb, dev); 3421 if (IS_ERR(skb)) { 3422 if (PTR_ERR(skb) != -EINPROGRESS) 3423 dev->stats.tx_dropped++; 3424 return NETDEV_TX_OK; 3425 } 3426 3427 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 3428 3429 macsec_encrypt_finish(skb, dev); 3430 ret = dev_queue_xmit(skb); 3431 count_tx(dev, ret, len); 3432 return ret; 3433 } 3434 3435 #define SW_MACSEC_FEATURES \ 3436 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 3437 3438 /* If h/w offloading is enabled, use real device features save for 3439 * VLAN_FEATURES - they require additional ops 3440 * HW_MACSEC - no reason to report it 3441 */ 3442 #define REAL_DEV_FEATURES(dev) \ 3443 ((dev)->features & ~(NETIF_F_VLAN_FEATURES | NETIF_F_HW_MACSEC)) 3444 3445 static int macsec_dev_init(struct net_device *dev) 3446 { 3447 struct macsec_dev *macsec = macsec_priv(dev); 3448 struct net_device *real_dev = macsec->real_dev; 3449 int err; 3450 3451 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 3452 if (!dev->tstats) 3453 return -ENOMEM; 3454 3455 err = gro_cells_init(&macsec->gro_cells, dev); 3456 if (err) { 3457 free_percpu(dev->tstats); 3458 return err; 3459 } 3460 3461 if (macsec_is_offloaded(macsec)) { 3462 dev->features = REAL_DEV_FEATURES(real_dev); 3463 } else { 3464 dev->features = real_dev->features & SW_MACSEC_FEATURES; 3465 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 3466 } 3467 3468 dev->needed_headroom = real_dev->needed_headroom + 3469 MACSEC_NEEDED_HEADROOM; 3470 dev->needed_tailroom = real_dev->needed_tailroom + 3471 MACSEC_NEEDED_TAILROOM; 3472 3473 if (is_zero_ether_addr(dev->dev_addr)) 3474 eth_hw_addr_inherit(dev, real_dev); 3475 if (is_zero_ether_addr(dev->broadcast)) 3476 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 3477 3478 /* Get macsec's reference to real_dev */ 3479 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL); 3480 3481 return 0; 3482 } 3483 3484 static void macsec_dev_uninit(struct net_device *dev) 3485 { 3486 struct macsec_dev *macsec = macsec_priv(dev); 3487 3488 gro_cells_destroy(&macsec->gro_cells); 3489 free_percpu(dev->tstats); 3490 } 3491 3492 static netdev_features_t macsec_fix_features(struct net_device *dev, 3493 netdev_features_t features) 3494 { 3495 struct macsec_dev *macsec = macsec_priv(dev); 3496 struct net_device *real_dev = macsec->real_dev; 3497 3498 if (macsec_is_offloaded(macsec)) 3499 return REAL_DEV_FEATURES(real_dev); 3500 3501 features &= (real_dev->features & SW_MACSEC_FEATURES) | 3502 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 3503 features |= NETIF_F_LLTX; 3504 3505 return features; 3506 } 3507 3508 static int macsec_dev_open(struct net_device *dev) 3509 { 3510 struct macsec_dev *macsec = macsec_priv(dev); 3511 struct net_device *real_dev = macsec->real_dev; 3512 int err; 3513 3514 err = dev_uc_add(real_dev, dev->dev_addr); 3515 if (err < 0) 3516 return err; 3517 3518 if (dev->flags & IFF_ALLMULTI) { 3519 err = dev_set_allmulti(real_dev, 1); 3520 if (err < 0) 3521 goto del_unicast; 3522 } 3523 3524 if (dev->flags & IFF_PROMISC) { 3525 err = dev_set_promiscuity(real_dev, 1); 3526 if (err < 0) 3527 goto clear_allmulti; 3528 } 3529 3530 /* If h/w offloading is available, propagate to the device */ 3531 if (macsec_is_offloaded(macsec)) { 3532 const struct macsec_ops *ops; 3533 struct macsec_context ctx; 3534 3535 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3536 if (!ops) { 3537 err = -EOPNOTSUPP; 3538 goto clear_allmulti; 3539 } 3540 3541 ctx.secy = &macsec->secy; 3542 err = macsec_offload(ops->mdo_dev_open, &ctx); 3543 if (err) 3544 goto clear_allmulti; 3545 } 3546 3547 if (netif_carrier_ok(real_dev)) 3548 netif_carrier_on(dev); 3549 3550 return 0; 3551 clear_allmulti: 3552 if (dev->flags & IFF_ALLMULTI) 3553 dev_set_allmulti(real_dev, -1); 3554 del_unicast: 3555 dev_uc_del(real_dev, dev->dev_addr); 3556 netif_carrier_off(dev); 3557 return err; 3558 } 3559 3560 static int macsec_dev_stop(struct net_device *dev) 3561 { 3562 struct macsec_dev *macsec = macsec_priv(dev); 3563 struct net_device *real_dev = macsec->real_dev; 3564 3565 netif_carrier_off(dev); 3566 3567 /* If h/w offloading is available, propagate to the device */ 3568 if (macsec_is_offloaded(macsec)) { 3569 const struct macsec_ops *ops; 3570 struct macsec_context ctx; 3571 3572 ops = macsec_get_ops(macsec, &ctx); 3573 if (ops) { 3574 ctx.secy = &macsec->secy; 3575 macsec_offload(ops->mdo_dev_stop, &ctx); 3576 } 3577 } 3578 3579 dev_mc_unsync(real_dev, dev); 3580 dev_uc_unsync(real_dev, dev); 3581 3582 if (dev->flags & IFF_ALLMULTI) 3583 dev_set_allmulti(real_dev, -1); 3584 3585 if (dev->flags & IFF_PROMISC) 3586 dev_set_promiscuity(real_dev, -1); 3587 3588 dev_uc_del(real_dev, dev->dev_addr); 3589 3590 return 0; 3591 } 3592 3593 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 3594 { 3595 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3596 3597 if (!(dev->flags & IFF_UP)) 3598 return; 3599 3600 if (change & IFF_ALLMULTI) 3601 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 3602 3603 if (change & IFF_PROMISC) 3604 dev_set_promiscuity(real_dev, 3605 dev->flags & IFF_PROMISC ? 1 : -1); 3606 } 3607 3608 static void macsec_dev_set_rx_mode(struct net_device *dev) 3609 { 3610 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3611 3612 dev_mc_sync(real_dev, dev); 3613 dev_uc_sync(real_dev, dev); 3614 } 3615 3616 static int macsec_set_mac_address(struct net_device *dev, void *p) 3617 { 3618 struct macsec_dev *macsec = macsec_priv(dev); 3619 struct net_device *real_dev = macsec->real_dev; 3620 struct sockaddr *addr = p; 3621 int err; 3622 3623 if (!is_valid_ether_addr(addr->sa_data)) 3624 return -EADDRNOTAVAIL; 3625 3626 if (!(dev->flags & IFF_UP)) 3627 goto out; 3628 3629 err = dev_uc_add(real_dev, addr->sa_data); 3630 if (err < 0) 3631 return err; 3632 3633 dev_uc_del(real_dev, dev->dev_addr); 3634 3635 out: 3636 eth_hw_addr_set(dev, addr->sa_data); 3637 3638 /* If h/w offloading is available, propagate to the device */ 3639 if (macsec_is_offloaded(macsec)) { 3640 const struct macsec_ops *ops; 3641 struct macsec_context ctx; 3642 3643 ops = macsec_get_ops(macsec, &ctx); 3644 if (ops) { 3645 ctx.secy = &macsec->secy; 3646 macsec_offload(ops->mdo_upd_secy, &ctx); 3647 } 3648 } 3649 3650 return 0; 3651 } 3652 3653 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 3654 { 3655 struct macsec_dev *macsec = macsec_priv(dev); 3656 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 3657 3658 if (macsec->real_dev->mtu - extra < new_mtu) 3659 return -ERANGE; 3660 3661 dev->mtu = new_mtu; 3662 3663 return 0; 3664 } 3665 3666 static void macsec_get_stats64(struct net_device *dev, 3667 struct rtnl_link_stats64 *s) 3668 { 3669 if (!dev->tstats) 3670 return; 3671 3672 dev_fetch_sw_netstats(s, dev->tstats); 3673 3674 s->rx_dropped = dev->stats.rx_dropped; 3675 s->tx_dropped = dev->stats.tx_dropped; 3676 s->rx_errors = dev->stats.rx_errors; 3677 } 3678 3679 static int macsec_get_iflink(const struct net_device *dev) 3680 { 3681 return macsec_priv(dev)->real_dev->ifindex; 3682 } 3683 3684 static const struct net_device_ops macsec_netdev_ops = { 3685 .ndo_init = macsec_dev_init, 3686 .ndo_uninit = macsec_dev_uninit, 3687 .ndo_open = macsec_dev_open, 3688 .ndo_stop = macsec_dev_stop, 3689 .ndo_fix_features = macsec_fix_features, 3690 .ndo_change_mtu = macsec_change_mtu, 3691 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 3692 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 3693 .ndo_set_mac_address = macsec_set_mac_address, 3694 .ndo_start_xmit = macsec_start_xmit, 3695 .ndo_get_stats64 = macsec_get_stats64, 3696 .ndo_get_iflink = macsec_get_iflink, 3697 }; 3698 3699 static const struct device_type macsec_type = { 3700 .name = "macsec", 3701 }; 3702 3703 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 3704 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 3705 [IFLA_MACSEC_PORT] = { .type = NLA_U16 }, 3706 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 3707 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 3708 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 3709 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 3710 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 3711 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 3712 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 3713 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 3714 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 3715 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 3716 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 3717 }; 3718 3719 static void macsec_free_netdev(struct net_device *dev) 3720 { 3721 struct macsec_dev *macsec = macsec_priv(dev); 3722 3723 if (macsec->secy.tx_sc.md_dst) 3724 metadata_dst_free(macsec->secy.tx_sc.md_dst); 3725 free_percpu(macsec->stats); 3726 free_percpu(macsec->secy.tx_sc.stats); 3727 3728 /* Get rid of the macsec's reference to real_dev */ 3729 netdev_put(macsec->real_dev, &macsec->dev_tracker); 3730 } 3731 3732 static void macsec_setup(struct net_device *dev) 3733 { 3734 ether_setup(dev); 3735 dev->min_mtu = 0; 3736 dev->max_mtu = ETH_MAX_MTU; 3737 dev->priv_flags |= IFF_NO_QUEUE; 3738 dev->netdev_ops = &macsec_netdev_ops; 3739 dev->needs_free_netdev = true; 3740 dev->priv_destructor = macsec_free_netdev; 3741 SET_NETDEV_DEVTYPE(dev, &macsec_type); 3742 3743 eth_zero_addr(dev->broadcast); 3744 } 3745 3746 static int macsec_changelink_common(struct net_device *dev, 3747 struct nlattr *data[]) 3748 { 3749 struct macsec_secy *secy; 3750 struct macsec_tx_sc *tx_sc; 3751 3752 secy = &macsec_priv(dev)->secy; 3753 tx_sc = &secy->tx_sc; 3754 3755 if (data[IFLA_MACSEC_ENCODING_SA]) { 3756 struct macsec_tx_sa *tx_sa; 3757 3758 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3759 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 3760 3761 secy->operational = tx_sa && tx_sa->active; 3762 } 3763 3764 if (data[IFLA_MACSEC_ENCRYPT]) 3765 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3766 3767 if (data[IFLA_MACSEC_PROTECT]) 3768 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3769 3770 if (data[IFLA_MACSEC_INC_SCI]) 3771 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3772 3773 if (data[IFLA_MACSEC_ES]) 3774 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3775 3776 if (data[IFLA_MACSEC_SCB]) 3777 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3778 3779 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3780 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3781 3782 if (data[IFLA_MACSEC_VALIDATION]) 3783 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3784 3785 if (data[IFLA_MACSEC_CIPHER_SUITE]) { 3786 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) { 3787 case MACSEC_CIPHER_ID_GCM_AES_128: 3788 case MACSEC_DEFAULT_CIPHER_ID: 3789 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3790 secy->xpn = false; 3791 break; 3792 case MACSEC_CIPHER_ID_GCM_AES_256: 3793 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3794 secy->xpn = false; 3795 break; 3796 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 3797 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3798 secy->xpn = true; 3799 break; 3800 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 3801 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3802 secy->xpn = true; 3803 break; 3804 default: 3805 return -EINVAL; 3806 } 3807 } 3808 3809 if (data[IFLA_MACSEC_WINDOW]) { 3810 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3811 3812 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window 3813 * for XPN cipher suites */ 3814 if (secy->xpn && 3815 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW) 3816 return -EINVAL; 3817 } 3818 3819 return 0; 3820 } 3821 3822 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3823 struct nlattr *data[], 3824 struct netlink_ext_ack *extack) 3825 { 3826 struct macsec_dev *macsec = macsec_priv(dev); 3827 struct macsec_tx_sc tx_sc; 3828 struct macsec_secy secy; 3829 int ret; 3830 3831 if (!data) 3832 return 0; 3833 3834 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3835 data[IFLA_MACSEC_ICV_LEN] || 3836 data[IFLA_MACSEC_SCI] || 3837 data[IFLA_MACSEC_PORT]) 3838 return -EINVAL; 3839 3840 /* Keep a copy of unmodified secy and tx_sc, in case the offload 3841 * propagation fails, to revert macsec_changelink_common. 3842 */ 3843 memcpy(&secy, &macsec->secy, sizeof(secy)); 3844 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc)); 3845 3846 ret = macsec_changelink_common(dev, data); 3847 if (ret) 3848 goto cleanup; 3849 3850 /* If h/w offloading is available, propagate to the device */ 3851 if (macsec_is_offloaded(macsec)) { 3852 const struct macsec_ops *ops; 3853 struct macsec_context ctx; 3854 int ret; 3855 3856 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3857 if (!ops) { 3858 ret = -EOPNOTSUPP; 3859 goto cleanup; 3860 } 3861 3862 ctx.secy = &macsec->secy; 3863 ret = macsec_offload(ops->mdo_upd_secy, &ctx); 3864 if (ret) 3865 goto cleanup; 3866 } 3867 3868 return 0; 3869 3870 cleanup: 3871 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc)); 3872 memcpy(&macsec->secy, &secy, sizeof(secy)); 3873 3874 return ret; 3875 } 3876 3877 static void macsec_del_dev(struct macsec_dev *macsec) 3878 { 3879 int i; 3880 3881 while (macsec->secy.rx_sc) { 3882 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 3883 3884 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 3885 free_rx_sc(rx_sc); 3886 } 3887 3888 for (i = 0; i < MACSEC_NUM_AN; i++) { 3889 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 3890 3891 if (sa) { 3892 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 3893 clear_tx_sa(sa); 3894 } 3895 } 3896 } 3897 3898 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 3899 { 3900 struct macsec_dev *macsec = macsec_priv(dev); 3901 struct net_device *real_dev = macsec->real_dev; 3902 3903 /* If h/w offloading is available, propagate to the device */ 3904 if (macsec_is_offloaded(macsec)) { 3905 const struct macsec_ops *ops; 3906 struct macsec_context ctx; 3907 3908 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3909 if (ops) { 3910 ctx.secy = &macsec->secy; 3911 macsec_offload(ops->mdo_del_secy, &ctx); 3912 } 3913 } 3914 3915 unregister_netdevice_queue(dev, head); 3916 list_del_rcu(&macsec->secys); 3917 macsec_del_dev(macsec); 3918 netdev_upper_dev_unlink(real_dev, dev); 3919 3920 macsec_generation++; 3921 } 3922 3923 static void macsec_dellink(struct net_device *dev, struct list_head *head) 3924 { 3925 struct macsec_dev *macsec = macsec_priv(dev); 3926 struct net_device *real_dev = macsec->real_dev; 3927 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3928 3929 macsec_common_dellink(dev, head); 3930 3931 if (list_empty(&rxd->secys)) { 3932 netdev_rx_handler_unregister(real_dev); 3933 kfree(rxd); 3934 } 3935 } 3936 3937 static int register_macsec_dev(struct net_device *real_dev, 3938 struct net_device *dev) 3939 { 3940 struct macsec_dev *macsec = macsec_priv(dev); 3941 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3942 3943 if (!rxd) { 3944 int err; 3945 3946 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 3947 if (!rxd) 3948 return -ENOMEM; 3949 3950 INIT_LIST_HEAD(&rxd->secys); 3951 3952 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 3953 rxd); 3954 if (err < 0) { 3955 kfree(rxd); 3956 return err; 3957 } 3958 } 3959 3960 list_add_tail_rcu(&macsec->secys, &rxd->secys); 3961 return 0; 3962 } 3963 3964 static bool sci_exists(struct net_device *dev, sci_t sci) 3965 { 3966 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 3967 struct macsec_dev *macsec; 3968 3969 list_for_each_entry(macsec, &rxd->secys, secys) { 3970 if (macsec->secy.sci == sci) 3971 return true; 3972 } 3973 3974 return false; 3975 } 3976 3977 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 3978 { 3979 return make_sci(dev->dev_addr, port); 3980 } 3981 3982 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 3983 { 3984 struct macsec_dev *macsec = macsec_priv(dev); 3985 struct macsec_secy *secy = &macsec->secy; 3986 3987 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 3988 if (!macsec->stats) 3989 return -ENOMEM; 3990 3991 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 3992 if (!secy->tx_sc.stats) { 3993 free_percpu(macsec->stats); 3994 return -ENOMEM; 3995 } 3996 3997 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL); 3998 if (!secy->tx_sc.md_dst) { 3999 free_percpu(secy->tx_sc.stats); 4000 free_percpu(macsec->stats); 4001 return -ENOMEM; 4002 } 4003 4004 if (sci == MACSEC_UNDEF_SCI) 4005 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4006 4007 secy->netdev = dev; 4008 secy->operational = true; 4009 secy->key_len = DEFAULT_SAK_LEN; 4010 secy->icv_len = icv_len; 4011 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 4012 secy->protect_frames = true; 4013 secy->replay_protect = false; 4014 secy->xpn = DEFAULT_XPN; 4015 4016 secy->sci = sci; 4017 secy->tx_sc.md_dst->u.macsec_info.sci = sci; 4018 secy->tx_sc.active = true; 4019 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 4020 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 4021 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 4022 secy->tx_sc.end_station = false; 4023 secy->tx_sc.scb = false; 4024 4025 return 0; 4026 } 4027 4028 static struct lock_class_key macsec_netdev_addr_lock_key; 4029 4030 static int macsec_newlink(struct net *net, struct net_device *dev, 4031 struct nlattr *tb[], struct nlattr *data[], 4032 struct netlink_ext_ack *extack) 4033 { 4034 struct macsec_dev *macsec = macsec_priv(dev); 4035 rx_handler_func_t *rx_handler; 4036 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4037 struct net_device *real_dev; 4038 int err, mtu; 4039 sci_t sci; 4040 4041 if (!tb[IFLA_LINK]) 4042 return -EINVAL; 4043 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 4044 if (!real_dev) 4045 return -ENODEV; 4046 if (real_dev->type != ARPHRD_ETHER) 4047 return -EINVAL; 4048 4049 dev->priv_flags |= IFF_MACSEC; 4050 4051 macsec->real_dev = real_dev; 4052 4053 if (data && data[IFLA_MACSEC_OFFLOAD]) 4054 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]); 4055 else 4056 /* MACsec offloading is off by default */ 4057 macsec->offload = MACSEC_OFFLOAD_OFF; 4058 4059 /* Check if the offloading mode is supported by the underlying layers */ 4060 if (macsec->offload != MACSEC_OFFLOAD_OFF && 4061 !macsec_check_offload(macsec->offload, macsec)) 4062 return -EOPNOTSUPP; 4063 4064 /* send_sci must be set to true when transmit sci explicitly is set */ 4065 if ((data && data[IFLA_MACSEC_SCI]) && 4066 (data && data[IFLA_MACSEC_INC_SCI])) { 4067 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 4068 4069 if (!send_sci) 4070 return -EINVAL; 4071 } 4072 4073 if (data && data[IFLA_MACSEC_ICV_LEN]) 4074 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4075 mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 4076 if (mtu < 0) 4077 dev->mtu = 0; 4078 else 4079 dev->mtu = mtu; 4080 4081 rx_handler = rtnl_dereference(real_dev->rx_handler); 4082 if (rx_handler && rx_handler != macsec_handle_frame) 4083 return -EBUSY; 4084 4085 err = register_netdevice(dev); 4086 if (err < 0) 4087 return err; 4088 4089 netdev_lockdep_set_classes(dev); 4090 lockdep_set_class(&dev->addr_list_lock, 4091 &macsec_netdev_addr_lock_key); 4092 4093 err = netdev_upper_dev_link(real_dev, dev, extack); 4094 if (err < 0) 4095 goto unregister; 4096 4097 /* need to be already registered so that ->init has run and 4098 * the MAC addr is set 4099 */ 4100 if (data && data[IFLA_MACSEC_SCI]) 4101 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 4102 else if (data && data[IFLA_MACSEC_PORT]) 4103 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 4104 else 4105 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4106 4107 if (rx_handler && sci_exists(real_dev, sci)) { 4108 err = -EBUSY; 4109 goto unlink; 4110 } 4111 4112 err = macsec_add_dev(dev, sci, icv_len); 4113 if (err) 4114 goto unlink; 4115 4116 if (data) { 4117 err = macsec_changelink_common(dev, data); 4118 if (err) 4119 goto del_dev; 4120 } 4121 4122 /* If h/w offloading is available, propagate to the device */ 4123 if (macsec_is_offloaded(macsec)) { 4124 const struct macsec_ops *ops; 4125 struct macsec_context ctx; 4126 4127 ops = macsec_get_ops(macsec, &ctx); 4128 if (ops) { 4129 ctx.secy = &macsec->secy; 4130 err = macsec_offload(ops->mdo_add_secy, &ctx); 4131 if (err) 4132 goto del_dev; 4133 } 4134 } 4135 4136 err = register_macsec_dev(real_dev, dev); 4137 if (err < 0) 4138 goto del_dev; 4139 4140 netif_stacked_transfer_operstate(real_dev, dev); 4141 linkwatch_fire_event(dev); 4142 4143 macsec_generation++; 4144 4145 return 0; 4146 4147 del_dev: 4148 macsec_del_dev(macsec); 4149 unlink: 4150 netdev_upper_dev_unlink(real_dev, dev); 4151 unregister: 4152 unregister_netdevice(dev); 4153 return err; 4154 } 4155 4156 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], 4157 struct netlink_ext_ack *extack) 4158 { 4159 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 4160 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4161 int flag; 4162 bool es, scb, sci; 4163 4164 if (!data) 4165 return 0; 4166 4167 if (data[IFLA_MACSEC_CIPHER_SUITE]) 4168 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 4169 4170 if (data[IFLA_MACSEC_ICV_LEN]) { 4171 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4172 if (icv_len != MACSEC_DEFAULT_ICV_LEN) { 4173 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 4174 struct crypto_aead *dummy_tfm; 4175 4176 dummy_tfm = macsec_alloc_tfm(dummy_key, 4177 DEFAULT_SAK_LEN, 4178 icv_len); 4179 if (IS_ERR(dummy_tfm)) 4180 return PTR_ERR(dummy_tfm); 4181 crypto_free_aead(dummy_tfm); 4182 } 4183 } 4184 4185 switch (csid) { 4186 case MACSEC_CIPHER_ID_GCM_AES_128: 4187 case MACSEC_CIPHER_ID_GCM_AES_256: 4188 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 4189 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 4190 case MACSEC_DEFAULT_CIPHER_ID: 4191 if (icv_len < MACSEC_MIN_ICV_LEN || 4192 icv_len > MACSEC_STD_ICV_LEN) 4193 return -EINVAL; 4194 break; 4195 default: 4196 return -EINVAL; 4197 } 4198 4199 if (data[IFLA_MACSEC_ENCODING_SA]) { 4200 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 4201 return -EINVAL; 4202 } 4203 4204 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 4205 flag < IFLA_MACSEC_VALIDATION; 4206 flag++) { 4207 if (data[flag]) { 4208 if (nla_get_u8(data[flag]) > 1) 4209 return -EINVAL; 4210 } 4211 } 4212 4213 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 4214 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 4215 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 4216 4217 if ((sci && (scb || es)) || (scb && es)) 4218 return -EINVAL; 4219 4220 if (data[IFLA_MACSEC_VALIDATION] && 4221 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 4222 return -EINVAL; 4223 4224 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 4225 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 4226 !data[IFLA_MACSEC_WINDOW]) 4227 return -EINVAL; 4228 4229 return 0; 4230 } 4231 4232 static struct net *macsec_get_link_net(const struct net_device *dev) 4233 { 4234 return dev_net(macsec_priv(dev)->real_dev); 4235 } 4236 4237 static size_t macsec_get_size(const struct net_device *dev) 4238 { 4239 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ 4240 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ 4241 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ 4242 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ 4243 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ 4244 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ 4245 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ 4246 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ 4247 nla_total_size(1) + /* IFLA_MACSEC_ES */ 4248 nla_total_size(1) + /* IFLA_MACSEC_SCB */ 4249 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ 4250 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ 4251 0; 4252 } 4253 4254 static int macsec_fill_info(struct sk_buff *skb, 4255 const struct net_device *dev) 4256 { 4257 struct macsec_secy *secy = &macsec_priv(dev)->secy; 4258 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 4259 u64 csid; 4260 4261 switch (secy->key_len) { 4262 case MACSEC_GCM_AES_128_SAK_LEN: 4263 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 4264 break; 4265 case MACSEC_GCM_AES_256_SAK_LEN: 4266 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 4267 break; 4268 default: 4269 goto nla_put_failure; 4270 } 4271 4272 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 4273 IFLA_MACSEC_PAD) || 4274 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 4275 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 4276 csid, IFLA_MACSEC_PAD) || 4277 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 4278 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 4279 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 4280 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 4281 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 4282 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 4283 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 4284 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 4285 0) 4286 goto nla_put_failure; 4287 4288 if (secy->replay_protect) { 4289 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 4290 goto nla_put_failure; 4291 } 4292 4293 return 0; 4294 4295 nla_put_failure: 4296 return -EMSGSIZE; 4297 } 4298 4299 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 4300 .kind = "macsec", 4301 .priv_size = sizeof(struct macsec_dev), 4302 .maxtype = IFLA_MACSEC_MAX, 4303 .policy = macsec_rtnl_policy, 4304 .setup = macsec_setup, 4305 .validate = macsec_validate_attr, 4306 .newlink = macsec_newlink, 4307 .changelink = macsec_changelink, 4308 .dellink = macsec_dellink, 4309 .get_size = macsec_get_size, 4310 .fill_info = macsec_fill_info, 4311 .get_link_net = macsec_get_link_net, 4312 }; 4313 4314 static bool is_macsec_master(struct net_device *dev) 4315 { 4316 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 4317 } 4318 4319 static int macsec_notify(struct notifier_block *this, unsigned long event, 4320 void *ptr) 4321 { 4322 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 4323 LIST_HEAD(head); 4324 4325 if (!is_macsec_master(real_dev)) 4326 return NOTIFY_DONE; 4327 4328 switch (event) { 4329 case NETDEV_DOWN: 4330 case NETDEV_UP: 4331 case NETDEV_CHANGE: { 4332 struct macsec_dev *m, *n; 4333 struct macsec_rxh_data *rxd; 4334 4335 rxd = macsec_data_rtnl(real_dev); 4336 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4337 struct net_device *dev = m->secy.netdev; 4338 4339 netif_stacked_transfer_operstate(real_dev, dev); 4340 } 4341 break; 4342 } 4343 case NETDEV_UNREGISTER: { 4344 struct macsec_dev *m, *n; 4345 struct macsec_rxh_data *rxd; 4346 4347 rxd = macsec_data_rtnl(real_dev); 4348 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4349 macsec_common_dellink(m->secy.netdev, &head); 4350 } 4351 4352 netdev_rx_handler_unregister(real_dev); 4353 kfree(rxd); 4354 4355 unregister_netdevice_many(&head); 4356 break; 4357 } 4358 case NETDEV_CHANGEMTU: { 4359 struct macsec_dev *m; 4360 struct macsec_rxh_data *rxd; 4361 4362 rxd = macsec_data_rtnl(real_dev); 4363 list_for_each_entry(m, &rxd->secys, secys) { 4364 struct net_device *dev = m->secy.netdev; 4365 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 4366 macsec_extra_len(true)); 4367 4368 if (dev->mtu > mtu) 4369 dev_set_mtu(dev, mtu); 4370 } 4371 } 4372 } 4373 4374 return NOTIFY_OK; 4375 } 4376 4377 static struct notifier_block macsec_notifier = { 4378 .notifier_call = macsec_notify, 4379 }; 4380 4381 static int __init macsec_init(void) 4382 { 4383 int err; 4384 4385 pr_info("MACsec IEEE 802.1AE\n"); 4386 err = register_netdevice_notifier(&macsec_notifier); 4387 if (err) 4388 return err; 4389 4390 err = rtnl_link_register(&macsec_link_ops); 4391 if (err) 4392 goto notifier; 4393 4394 err = genl_register_family(&macsec_fam); 4395 if (err) 4396 goto rtnl; 4397 4398 return 0; 4399 4400 rtnl: 4401 rtnl_link_unregister(&macsec_link_ops); 4402 notifier: 4403 unregister_netdevice_notifier(&macsec_notifier); 4404 return err; 4405 } 4406 4407 static void __exit macsec_exit(void) 4408 { 4409 genl_unregister_family(&macsec_fam); 4410 rtnl_link_unregister(&macsec_link_ops); 4411 unregister_netdevice_notifier(&macsec_notifier); 4412 rcu_barrier(); 4413 } 4414 4415 module_init(macsec_init); 4416 module_exit(macsec_exit); 4417 4418 MODULE_ALIAS_RTNL_LINK("macsec"); 4419 MODULE_ALIAS_GENL_FAMILY("macsec"); 4420 4421 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 4422 MODULE_LICENSE("GPL v2"); 4423