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 int ret; 1880 1881 if (!attrs[MACSEC_ATTR_IFINDEX]) 1882 return -EINVAL; 1883 1884 if (parse_rxsc_config(attrs, tb_rxsc)) 1885 return -EINVAL; 1886 1887 if (!validate_add_rxsc(tb_rxsc)) 1888 return -EINVAL; 1889 1890 rtnl_lock(); 1891 dev = get_dev_from_nl(genl_info_net(info), attrs); 1892 if (IS_ERR(dev)) { 1893 rtnl_unlock(); 1894 return PTR_ERR(dev); 1895 } 1896 1897 secy = &macsec_priv(dev)->secy; 1898 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1899 1900 rx_sc = create_rx_sc(dev, sci); 1901 if (IS_ERR(rx_sc)) { 1902 rtnl_unlock(); 1903 return PTR_ERR(rx_sc); 1904 } 1905 1906 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1907 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1908 1909 if (macsec_is_offloaded(netdev_priv(dev))) { 1910 const struct macsec_ops *ops; 1911 struct macsec_context ctx; 1912 1913 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1914 if (!ops) { 1915 ret = -EOPNOTSUPP; 1916 goto cleanup; 1917 } 1918 1919 ctx.rx_sc = rx_sc; 1920 ctx.secy = secy; 1921 1922 ret = macsec_offload(ops->mdo_add_rxsc, &ctx); 1923 if (ret) 1924 goto cleanup; 1925 } 1926 1927 rtnl_unlock(); 1928 1929 return 0; 1930 1931 cleanup: 1932 del_rx_sc(secy, sci); 1933 free_rx_sc(rx_sc); 1934 rtnl_unlock(); 1935 return ret; 1936 } 1937 1938 static bool validate_add_txsa(struct nlattr **attrs) 1939 { 1940 if (!attrs[MACSEC_SA_ATTR_AN] || 1941 !attrs[MACSEC_SA_ATTR_PN] || 1942 !attrs[MACSEC_SA_ATTR_KEY] || 1943 !attrs[MACSEC_SA_ATTR_KEYID]) 1944 return false; 1945 1946 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1947 return false; 1948 1949 if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 1950 return false; 1951 1952 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1953 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1954 return false; 1955 } 1956 1957 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1958 return false; 1959 1960 return true; 1961 } 1962 1963 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1964 { 1965 struct net_device *dev; 1966 struct nlattr **attrs = info->attrs; 1967 struct macsec_secy *secy; 1968 struct macsec_tx_sc *tx_sc; 1969 struct macsec_tx_sa *tx_sa; 1970 unsigned char assoc_num; 1971 int pn_len; 1972 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1973 bool was_operational; 1974 int err; 1975 1976 if (!attrs[MACSEC_ATTR_IFINDEX]) 1977 return -EINVAL; 1978 1979 if (parse_sa_config(attrs, tb_sa)) 1980 return -EINVAL; 1981 1982 if (!validate_add_txsa(tb_sa)) 1983 return -EINVAL; 1984 1985 rtnl_lock(); 1986 dev = get_dev_from_nl(genl_info_net(info), attrs); 1987 if (IS_ERR(dev)) { 1988 rtnl_unlock(); 1989 return PTR_ERR(dev); 1990 } 1991 1992 secy = &macsec_priv(dev)->secy; 1993 tx_sc = &secy->tx_sc; 1994 1995 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1996 1997 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1998 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 1999 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 2000 rtnl_unlock(); 2001 return -EINVAL; 2002 } 2003 2004 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2005 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2006 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n", 2007 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2008 rtnl_unlock(); 2009 return -EINVAL; 2010 } 2011 2012 if (secy->xpn) { 2013 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 2014 rtnl_unlock(); 2015 return -EINVAL; 2016 } 2017 2018 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 2019 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n", 2020 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 2021 MACSEC_SALT_LEN); 2022 rtnl_unlock(); 2023 return -EINVAL; 2024 } 2025 } 2026 2027 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 2028 if (tx_sa) { 2029 rtnl_unlock(); 2030 return -EBUSY; 2031 } 2032 2033 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 2034 if (!tx_sa) { 2035 rtnl_unlock(); 2036 return -ENOMEM; 2037 } 2038 2039 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2040 secy->key_len, secy->icv_len); 2041 if (err < 0) { 2042 kfree(tx_sa); 2043 rtnl_unlock(); 2044 return err; 2045 } 2046 2047 spin_lock_bh(&tx_sa->lock); 2048 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2049 spin_unlock_bh(&tx_sa->lock); 2050 2051 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2052 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2053 2054 was_operational = secy->operational; 2055 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 2056 secy->operational = true; 2057 2058 if (secy->xpn) { 2059 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 2060 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 2061 MACSEC_SALT_LEN); 2062 } 2063 2064 /* If h/w offloading is available, propagate to the device */ 2065 if (macsec_is_offloaded(netdev_priv(dev))) { 2066 const struct macsec_ops *ops; 2067 struct macsec_context ctx; 2068 2069 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2070 if (!ops) { 2071 err = -EOPNOTSUPP; 2072 goto cleanup; 2073 } 2074 2075 ctx.sa.assoc_num = assoc_num; 2076 ctx.sa.tx_sa = tx_sa; 2077 ctx.secy = secy; 2078 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2079 secy->key_len); 2080 2081 err = macsec_offload(ops->mdo_add_txsa, &ctx); 2082 if (err) 2083 goto cleanup; 2084 } 2085 2086 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 2087 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 2088 2089 rtnl_unlock(); 2090 2091 return 0; 2092 2093 cleanup: 2094 secy->operational = was_operational; 2095 macsec_txsa_put(tx_sa); 2096 rtnl_unlock(); 2097 return err; 2098 } 2099 2100 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 2101 { 2102 struct nlattr **attrs = info->attrs; 2103 struct net_device *dev; 2104 struct macsec_secy *secy; 2105 struct macsec_rx_sc *rx_sc; 2106 struct macsec_rx_sa *rx_sa; 2107 u8 assoc_num; 2108 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2109 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2110 int ret; 2111 2112 if (!attrs[MACSEC_ATTR_IFINDEX]) 2113 return -EINVAL; 2114 2115 if (parse_sa_config(attrs, tb_sa)) 2116 return -EINVAL; 2117 2118 if (parse_rxsc_config(attrs, tb_rxsc)) 2119 return -EINVAL; 2120 2121 rtnl_lock(); 2122 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2123 &dev, &secy, &rx_sc, &assoc_num); 2124 if (IS_ERR(rx_sa)) { 2125 rtnl_unlock(); 2126 return PTR_ERR(rx_sa); 2127 } 2128 2129 if (rx_sa->active) { 2130 rtnl_unlock(); 2131 return -EBUSY; 2132 } 2133 2134 /* If h/w offloading is available, propagate to the device */ 2135 if (macsec_is_offloaded(netdev_priv(dev))) { 2136 const struct macsec_ops *ops; 2137 struct macsec_context ctx; 2138 2139 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2140 if (!ops) { 2141 ret = -EOPNOTSUPP; 2142 goto cleanup; 2143 } 2144 2145 ctx.sa.assoc_num = assoc_num; 2146 ctx.sa.rx_sa = rx_sa; 2147 ctx.secy = secy; 2148 2149 ret = macsec_offload(ops->mdo_del_rxsa, &ctx); 2150 if (ret) 2151 goto cleanup; 2152 } 2153 2154 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 2155 clear_rx_sa(rx_sa); 2156 2157 rtnl_unlock(); 2158 2159 return 0; 2160 2161 cleanup: 2162 rtnl_unlock(); 2163 return ret; 2164 } 2165 2166 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 2167 { 2168 struct nlattr **attrs = info->attrs; 2169 struct net_device *dev; 2170 struct macsec_secy *secy; 2171 struct macsec_rx_sc *rx_sc; 2172 sci_t sci; 2173 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2174 int ret; 2175 2176 if (!attrs[MACSEC_ATTR_IFINDEX]) 2177 return -EINVAL; 2178 2179 if (parse_rxsc_config(attrs, tb_rxsc)) 2180 return -EINVAL; 2181 2182 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 2183 return -EINVAL; 2184 2185 rtnl_lock(); 2186 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 2187 if (IS_ERR(dev)) { 2188 rtnl_unlock(); 2189 return PTR_ERR(dev); 2190 } 2191 2192 secy = &macsec_priv(dev)->secy; 2193 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 2194 2195 rx_sc = del_rx_sc(secy, sci); 2196 if (!rx_sc) { 2197 rtnl_unlock(); 2198 return -ENODEV; 2199 } 2200 2201 /* If h/w offloading is available, propagate to the device */ 2202 if (macsec_is_offloaded(netdev_priv(dev))) { 2203 const struct macsec_ops *ops; 2204 struct macsec_context ctx; 2205 2206 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2207 if (!ops) { 2208 ret = -EOPNOTSUPP; 2209 goto cleanup; 2210 } 2211 2212 ctx.rx_sc = rx_sc; 2213 ctx.secy = secy; 2214 ret = macsec_offload(ops->mdo_del_rxsc, &ctx); 2215 if (ret) 2216 goto cleanup; 2217 } 2218 2219 free_rx_sc(rx_sc); 2220 rtnl_unlock(); 2221 2222 return 0; 2223 2224 cleanup: 2225 rtnl_unlock(); 2226 return ret; 2227 } 2228 2229 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 2230 { 2231 struct nlattr **attrs = info->attrs; 2232 struct net_device *dev; 2233 struct macsec_secy *secy; 2234 struct macsec_tx_sc *tx_sc; 2235 struct macsec_tx_sa *tx_sa; 2236 u8 assoc_num; 2237 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2238 int ret; 2239 2240 if (!attrs[MACSEC_ATTR_IFINDEX]) 2241 return -EINVAL; 2242 2243 if (parse_sa_config(attrs, tb_sa)) 2244 return -EINVAL; 2245 2246 rtnl_lock(); 2247 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2248 &dev, &secy, &tx_sc, &assoc_num); 2249 if (IS_ERR(tx_sa)) { 2250 rtnl_unlock(); 2251 return PTR_ERR(tx_sa); 2252 } 2253 2254 if (tx_sa->active) { 2255 rtnl_unlock(); 2256 return -EBUSY; 2257 } 2258 2259 /* If h/w offloading is available, propagate to the device */ 2260 if (macsec_is_offloaded(netdev_priv(dev))) { 2261 const struct macsec_ops *ops; 2262 struct macsec_context ctx; 2263 2264 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2265 if (!ops) { 2266 ret = -EOPNOTSUPP; 2267 goto cleanup; 2268 } 2269 2270 ctx.sa.assoc_num = assoc_num; 2271 ctx.sa.tx_sa = tx_sa; 2272 ctx.secy = secy; 2273 2274 ret = macsec_offload(ops->mdo_del_txsa, &ctx); 2275 if (ret) 2276 goto cleanup; 2277 } 2278 2279 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 2280 clear_tx_sa(tx_sa); 2281 2282 rtnl_unlock(); 2283 2284 return 0; 2285 2286 cleanup: 2287 rtnl_unlock(); 2288 return ret; 2289 } 2290 2291 static bool validate_upd_sa(struct nlattr **attrs) 2292 { 2293 if (!attrs[MACSEC_SA_ATTR_AN] || 2294 attrs[MACSEC_SA_ATTR_KEY] || 2295 attrs[MACSEC_SA_ATTR_KEYID] || 2296 attrs[MACSEC_SA_ATTR_SSCI] || 2297 attrs[MACSEC_SA_ATTR_SALT]) 2298 return false; 2299 2300 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 2301 return false; 2302 2303 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 2304 return false; 2305 2306 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 2307 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 2308 return false; 2309 } 2310 2311 return true; 2312 } 2313 2314 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2315 { 2316 struct nlattr **attrs = info->attrs; 2317 struct net_device *dev; 2318 struct macsec_secy *secy; 2319 struct macsec_tx_sc *tx_sc; 2320 struct macsec_tx_sa *tx_sa; 2321 u8 assoc_num; 2322 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2323 bool was_operational, was_active; 2324 pn_t prev_pn; 2325 int ret = 0; 2326 2327 prev_pn.full64 = 0; 2328 2329 if (!attrs[MACSEC_ATTR_IFINDEX]) 2330 return -EINVAL; 2331 2332 if (parse_sa_config(attrs, tb_sa)) 2333 return -EINVAL; 2334 2335 if (!validate_upd_sa(tb_sa)) 2336 return -EINVAL; 2337 2338 rtnl_lock(); 2339 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2340 &dev, &secy, &tx_sc, &assoc_num); 2341 if (IS_ERR(tx_sa)) { 2342 rtnl_unlock(); 2343 return PTR_ERR(tx_sa); 2344 } 2345 2346 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2347 int pn_len; 2348 2349 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2350 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2351 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n", 2352 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2353 rtnl_unlock(); 2354 return -EINVAL; 2355 } 2356 2357 spin_lock_bh(&tx_sa->lock); 2358 prev_pn = tx_sa->next_pn_halves; 2359 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2360 spin_unlock_bh(&tx_sa->lock); 2361 } 2362 2363 was_active = tx_sa->active; 2364 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2365 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2366 2367 was_operational = secy->operational; 2368 if (assoc_num == tx_sc->encoding_sa) 2369 secy->operational = tx_sa->active; 2370 2371 /* If h/w offloading is available, propagate to the device */ 2372 if (macsec_is_offloaded(netdev_priv(dev))) { 2373 const struct macsec_ops *ops; 2374 struct macsec_context ctx; 2375 2376 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2377 if (!ops) { 2378 ret = -EOPNOTSUPP; 2379 goto cleanup; 2380 } 2381 2382 ctx.sa.assoc_num = assoc_num; 2383 ctx.sa.tx_sa = tx_sa; 2384 ctx.secy = secy; 2385 2386 ret = macsec_offload(ops->mdo_upd_txsa, &ctx); 2387 if (ret) 2388 goto cleanup; 2389 } 2390 2391 rtnl_unlock(); 2392 2393 return 0; 2394 2395 cleanup: 2396 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2397 spin_lock_bh(&tx_sa->lock); 2398 tx_sa->next_pn_halves = prev_pn; 2399 spin_unlock_bh(&tx_sa->lock); 2400 } 2401 tx_sa->active = was_active; 2402 secy->operational = was_operational; 2403 rtnl_unlock(); 2404 return ret; 2405 } 2406 2407 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2408 { 2409 struct nlattr **attrs = info->attrs; 2410 struct net_device *dev; 2411 struct macsec_secy *secy; 2412 struct macsec_rx_sc *rx_sc; 2413 struct macsec_rx_sa *rx_sa; 2414 u8 assoc_num; 2415 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2416 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2417 bool was_active; 2418 pn_t prev_pn; 2419 int ret = 0; 2420 2421 prev_pn.full64 = 0; 2422 2423 if (!attrs[MACSEC_ATTR_IFINDEX]) 2424 return -EINVAL; 2425 2426 if (parse_rxsc_config(attrs, tb_rxsc)) 2427 return -EINVAL; 2428 2429 if (parse_sa_config(attrs, tb_sa)) 2430 return -EINVAL; 2431 2432 if (!validate_upd_sa(tb_sa)) 2433 return -EINVAL; 2434 2435 rtnl_lock(); 2436 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2437 &dev, &secy, &rx_sc, &assoc_num); 2438 if (IS_ERR(rx_sa)) { 2439 rtnl_unlock(); 2440 return PTR_ERR(rx_sa); 2441 } 2442 2443 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2444 int pn_len; 2445 2446 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2447 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2448 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n", 2449 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2450 rtnl_unlock(); 2451 return -EINVAL; 2452 } 2453 2454 spin_lock_bh(&rx_sa->lock); 2455 prev_pn = rx_sa->next_pn_halves; 2456 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2457 spin_unlock_bh(&rx_sa->lock); 2458 } 2459 2460 was_active = rx_sa->active; 2461 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2462 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2463 2464 /* If h/w offloading is available, propagate to the device */ 2465 if (macsec_is_offloaded(netdev_priv(dev))) { 2466 const struct macsec_ops *ops; 2467 struct macsec_context ctx; 2468 2469 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2470 if (!ops) { 2471 ret = -EOPNOTSUPP; 2472 goto cleanup; 2473 } 2474 2475 ctx.sa.assoc_num = assoc_num; 2476 ctx.sa.rx_sa = rx_sa; 2477 ctx.secy = secy; 2478 2479 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx); 2480 if (ret) 2481 goto cleanup; 2482 } 2483 2484 rtnl_unlock(); 2485 return 0; 2486 2487 cleanup: 2488 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2489 spin_lock_bh(&rx_sa->lock); 2490 rx_sa->next_pn_halves = prev_pn; 2491 spin_unlock_bh(&rx_sa->lock); 2492 } 2493 rx_sa->active = was_active; 2494 rtnl_unlock(); 2495 return ret; 2496 } 2497 2498 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2499 { 2500 struct nlattr **attrs = info->attrs; 2501 struct net_device *dev; 2502 struct macsec_secy *secy; 2503 struct macsec_rx_sc *rx_sc; 2504 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2505 unsigned int prev_n_rx_sc; 2506 bool was_active; 2507 int ret; 2508 2509 if (!attrs[MACSEC_ATTR_IFINDEX]) 2510 return -EINVAL; 2511 2512 if (parse_rxsc_config(attrs, tb_rxsc)) 2513 return -EINVAL; 2514 2515 if (!validate_add_rxsc(tb_rxsc)) 2516 return -EINVAL; 2517 2518 rtnl_lock(); 2519 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2520 if (IS_ERR(rx_sc)) { 2521 rtnl_unlock(); 2522 return PTR_ERR(rx_sc); 2523 } 2524 2525 was_active = rx_sc->active; 2526 prev_n_rx_sc = secy->n_rx_sc; 2527 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2528 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2529 2530 if (rx_sc->active != new) 2531 secy->n_rx_sc += new ? 1 : -1; 2532 2533 rx_sc->active = new; 2534 } 2535 2536 /* If h/w offloading is available, propagate to the device */ 2537 if (macsec_is_offloaded(netdev_priv(dev))) { 2538 const struct macsec_ops *ops; 2539 struct macsec_context ctx; 2540 2541 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2542 if (!ops) { 2543 ret = -EOPNOTSUPP; 2544 goto cleanup; 2545 } 2546 2547 ctx.rx_sc = rx_sc; 2548 ctx.secy = secy; 2549 2550 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx); 2551 if (ret) 2552 goto cleanup; 2553 } 2554 2555 rtnl_unlock(); 2556 2557 return 0; 2558 2559 cleanup: 2560 secy->n_rx_sc = prev_n_rx_sc; 2561 rx_sc->active = was_active; 2562 rtnl_unlock(); 2563 return ret; 2564 } 2565 2566 static bool macsec_is_configured(struct macsec_dev *macsec) 2567 { 2568 struct macsec_secy *secy = &macsec->secy; 2569 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2570 int i; 2571 2572 if (secy->n_rx_sc > 0) 2573 return true; 2574 2575 for (i = 0; i < MACSEC_NUM_AN; i++) 2576 if (tx_sc->sa[i]) 2577 return true; 2578 2579 return false; 2580 } 2581 2582 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info) 2583 { 2584 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1]; 2585 enum macsec_offload offload, prev_offload; 2586 int (*func)(struct macsec_context *ctx); 2587 struct nlattr **attrs = info->attrs; 2588 struct net_device *dev; 2589 const struct macsec_ops *ops; 2590 struct macsec_context ctx; 2591 struct macsec_dev *macsec; 2592 int ret; 2593 2594 if (!attrs[MACSEC_ATTR_IFINDEX]) 2595 return -EINVAL; 2596 2597 if (!attrs[MACSEC_ATTR_OFFLOAD]) 2598 return -EINVAL; 2599 2600 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX, 2601 attrs[MACSEC_ATTR_OFFLOAD], 2602 macsec_genl_offload_policy, NULL)) 2603 return -EINVAL; 2604 2605 dev = get_dev_from_nl(genl_info_net(info), attrs); 2606 if (IS_ERR(dev)) 2607 return PTR_ERR(dev); 2608 macsec = macsec_priv(dev); 2609 2610 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) 2611 return -EINVAL; 2612 2613 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]); 2614 if (macsec->offload == offload) 2615 return 0; 2616 2617 /* Check if the offloading mode is supported by the underlying layers */ 2618 if (offload != MACSEC_OFFLOAD_OFF && 2619 !macsec_check_offload(offload, macsec)) 2620 return -EOPNOTSUPP; 2621 2622 /* Check if the net device is busy. */ 2623 if (netif_running(dev)) 2624 return -EBUSY; 2625 2626 rtnl_lock(); 2627 2628 prev_offload = macsec->offload; 2629 macsec->offload = offload; 2630 2631 /* Check if the device already has rules configured: we do not support 2632 * rules migration. 2633 */ 2634 if (macsec_is_configured(macsec)) { 2635 ret = -EBUSY; 2636 goto rollback; 2637 } 2638 2639 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload, 2640 macsec, &ctx); 2641 if (!ops) { 2642 ret = -EOPNOTSUPP; 2643 goto rollback; 2644 } 2645 2646 if (prev_offload == MACSEC_OFFLOAD_OFF) 2647 func = ops->mdo_add_secy; 2648 else 2649 func = ops->mdo_del_secy; 2650 2651 ctx.secy = &macsec->secy; 2652 ret = macsec_offload(func, &ctx); 2653 if (ret) 2654 goto rollback; 2655 2656 rtnl_unlock(); 2657 return 0; 2658 2659 rollback: 2660 macsec->offload = prev_offload; 2661 2662 rtnl_unlock(); 2663 return ret; 2664 } 2665 2666 static void get_tx_sa_stats(struct net_device *dev, int an, 2667 struct macsec_tx_sa *tx_sa, 2668 struct macsec_tx_sa_stats *sum) 2669 { 2670 struct macsec_dev *macsec = macsec_priv(dev); 2671 int cpu; 2672 2673 /* If h/w offloading is available, propagate to the device */ 2674 if (macsec_is_offloaded(macsec)) { 2675 const struct macsec_ops *ops; 2676 struct macsec_context ctx; 2677 2678 ops = macsec_get_ops(macsec, &ctx); 2679 if (ops) { 2680 ctx.sa.assoc_num = an; 2681 ctx.sa.tx_sa = tx_sa; 2682 ctx.stats.tx_sa_stats = sum; 2683 ctx.secy = &macsec_priv(dev)->secy; 2684 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx); 2685 } 2686 return; 2687 } 2688 2689 for_each_possible_cpu(cpu) { 2690 const struct macsec_tx_sa_stats *stats = 2691 per_cpu_ptr(tx_sa->stats, cpu); 2692 2693 sum->OutPktsProtected += stats->OutPktsProtected; 2694 sum->OutPktsEncrypted += stats->OutPktsEncrypted; 2695 } 2696 } 2697 2698 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum) 2699 { 2700 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, 2701 sum->OutPktsProtected) || 2702 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2703 sum->OutPktsEncrypted)) 2704 return -EMSGSIZE; 2705 2706 return 0; 2707 } 2708 2709 static void get_rx_sa_stats(struct net_device *dev, 2710 struct macsec_rx_sc *rx_sc, int an, 2711 struct macsec_rx_sa *rx_sa, 2712 struct macsec_rx_sa_stats *sum) 2713 { 2714 struct macsec_dev *macsec = macsec_priv(dev); 2715 int cpu; 2716 2717 /* If h/w offloading is available, propagate to the device */ 2718 if (macsec_is_offloaded(macsec)) { 2719 const struct macsec_ops *ops; 2720 struct macsec_context ctx; 2721 2722 ops = macsec_get_ops(macsec, &ctx); 2723 if (ops) { 2724 ctx.sa.assoc_num = an; 2725 ctx.sa.rx_sa = rx_sa; 2726 ctx.stats.rx_sa_stats = sum; 2727 ctx.secy = &macsec_priv(dev)->secy; 2728 ctx.rx_sc = rx_sc; 2729 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx); 2730 } 2731 return; 2732 } 2733 2734 for_each_possible_cpu(cpu) { 2735 const struct macsec_rx_sa_stats *stats = 2736 per_cpu_ptr(rx_sa->stats, cpu); 2737 2738 sum->InPktsOK += stats->InPktsOK; 2739 sum->InPktsInvalid += stats->InPktsInvalid; 2740 sum->InPktsNotValid += stats->InPktsNotValid; 2741 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA; 2742 sum->InPktsUnusedSA += stats->InPktsUnusedSA; 2743 } 2744 } 2745 2746 static int copy_rx_sa_stats(struct sk_buff *skb, 2747 struct macsec_rx_sa_stats *sum) 2748 { 2749 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) || 2750 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, 2751 sum->InPktsInvalid) || 2752 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, 2753 sum->InPktsNotValid) || 2754 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2755 sum->InPktsNotUsingSA) || 2756 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, 2757 sum->InPktsUnusedSA)) 2758 return -EMSGSIZE; 2759 2760 return 0; 2761 } 2762 2763 static void get_rx_sc_stats(struct net_device *dev, 2764 struct macsec_rx_sc *rx_sc, 2765 struct macsec_rx_sc_stats *sum) 2766 { 2767 struct macsec_dev *macsec = macsec_priv(dev); 2768 int cpu; 2769 2770 /* If h/w offloading is available, propagate to the device */ 2771 if (macsec_is_offloaded(macsec)) { 2772 const struct macsec_ops *ops; 2773 struct macsec_context ctx; 2774 2775 ops = macsec_get_ops(macsec, &ctx); 2776 if (ops) { 2777 ctx.stats.rx_sc_stats = sum; 2778 ctx.secy = &macsec_priv(dev)->secy; 2779 ctx.rx_sc = rx_sc; 2780 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx); 2781 } 2782 return; 2783 } 2784 2785 for_each_possible_cpu(cpu) { 2786 const struct pcpu_rx_sc_stats *stats; 2787 struct macsec_rx_sc_stats tmp; 2788 unsigned int start; 2789 2790 stats = per_cpu_ptr(rx_sc->stats, cpu); 2791 do { 2792 start = u64_stats_fetch_begin_irq(&stats->syncp); 2793 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2794 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2795 2796 sum->InOctetsValidated += tmp.InOctetsValidated; 2797 sum->InOctetsDecrypted += tmp.InOctetsDecrypted; 2798 sum->InPktsUnchecked += tmp.InPktsUnchecked; 2799 sum->InPktsDelayed += tmp.InPktsDelayed; 2800 sum->InPktsOK += tmp.InPktsOK; 2801 sum->InPktsInvalid += tmp.InPktsInvalid; 2802 sum->InPktsLate += tmp.InPktsLate; 2803 sum->InPktsNotValid += tmp.InPktsNotValid; 2804 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2805 sum->InPktsUnusedSA += tmp.InPktsUnusedSA; 2806 } 2807 } 2808 2809 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum) 2810 { 2811 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2812 sum->InOctetsValidated, 2813 MACSEC_RXSC_STATS_ATTR_PAD) || 2814 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2815 sum->InOctetsDecrypted, 2816 MACSEC_RXSC_STATS_ATTR_PAD) || 2817 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2818 sum->InPktsUnchecked, 2819 MACSEC_RXSC_STATS_ATTR_PAD) || 2820 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2821 sum->InPktsDelayed, 2822 MACSEC_RXSC_STATS_ATTR_PAD) || 2823 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2824 sum->InPktsOK, 2825 MACSEC_RXSC_STATS_ATTR_PAD) || 2826 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2827 sum->InPktsInvalid, 2828 MACSEC_RXSC_STATS_ATTR_PAD) || 2829 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2830 sum->InPktsLate, 2831 MACSEC_RXSC_STATS_ATTR_PAD) || 2832 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2833 sum->InPktsNotValid, 2834 MACSEC_RXSC_STATS_ATTR_PAD) || 2835 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2836 sum->InPktsNotUsingSA, 2837 MACSEC_RXSC_STATS_ATTR_PAD) || 2838 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2839 sum->InPktsUnusedSA, 2840 MACSEC_RXSC_STATS_ATTR_PAD)) 2841 return -EMSGSIZE; 2842 2843 return 0; 2844 } 2845 2846 static void get_tx_sc_stats(struct net_device *dev, 2847 struct macsec_tx_sc_stats *sum) 2848 { 2849 struct macsec_dev *macsec = macsec_priv(dev); 2850 int cpu; 2851 2852 /* If h/w offloading is available, propagate to the device */ 2853 if (macsec_is_offloaded(macsec)) { 2854 const struct macsec_ops *ops; 2855 struct macsec_context ctx; 2856 2857 ops = macsec_get_ops(macsec, &ctx); 2858 if (ops) { 2859 ctx.stats.tx_sc_stats = sum; 2860 ctx.secy = &macsec_priv(dev)->secy; 2861 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx); 2862 } 2863 return; 2864 } 2865 2866 for_each_possible_cpu(cpu) { 2867 const struct pcpu_tx_sc_stats *stats; 2868 struct macsec_tx_sc_stats tmp; 2869 unsigned int start; 2870 2871 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu); 2872 do { 2873 start = u64_stats_fetch_begin_irq(&stats->syncp); 2874 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2875 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2876 2877 sum->OutPktsProtected += tmp.OutPktsProtected; 2878 sum->OutPktsEncrypted += tmp.OutPktsEncrypted; 2879 sum->OutOctetsProtected += tmp.OutOctetsProtected; 2880 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2881 } 2882 } 2883 2884 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum) 2885 { 2886 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2887 sum->OutPktsProtected, 2888 MACSEC_TXSC_STATS_ATTR_PAD) || 2889 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2890 sum->OutPktsEncrypted, 2891 MACSEC_TXSC_STATS_ATTR_PAD) || 2892 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2893 sum->OutOctetsProtected, 2894 MACSEC_TXSC_STATS_ATTR_PAD) || 2895 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2896 sum->OutOctetsEncrypted, 2897 MACSEC_TXSC_STATS_ATTR_PAD)) 2898 return -EMSGSIZE; 2899 2900 return 0; 2901 } 2902 2903 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum) 2904 { 2905 struct macsec_dev *macsec = macsec_priv(dev); 2906 int cpu; 2907 2908 /* If h/w offloading is available, propagate to the device */ 2909 if (macsec_is_offloaded(macsec)) { 2910 const struct macsec_ops *ops; 2911 struct macsec_context ctx; 2912 2913 ops = macsec_get_ops(macsec, &ctx); 2914 if (ops) { 2915 ctx.stats.dev_stats = sum; 2916 ctx.secy = &macsec_priv(dev)->secy; 2917 macsec_offload(ops->mdo_get_dev_stats, &ctx); 2918 } 2919 return; 2920 } 2921 2922 for_each_possible_cpu(cpu) { 2923 const struct pcpu_secy_stats *stats; 2924 struct macsec_dev_stats tmp; 2925 unsigned int start; 2926 2927 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu); 2928 do { 2929 start = u64_stats_fetch_begin_irq(&stats->syncp); 2930 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2931 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2932 2933 sum->OutPktsUntagged += tmp.OutPktsUntagged; 2934 sum->InPktsUntagged += tmp.InPktsUntagged; 2935 sum->OutPktsTooLong += tmp.OutPktsTooLong; 2936 sum->InPktsNoTag += tmp.InPktsNoTag; 2937 sum->InPktsBadTag += tmp.InPktsBadTag; 2938 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2939 sum->InPktsNoSCI += tmp.InPktsNoSCI; 2940 sum->InPktsOverrun += tmp.InPktsOverrun; 2941 } 2942 } 2943 2944 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum) 2945 { 2946 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 2947 sum->OutPktsUntagged, 2948 MACSEC_SECY_STATS_ATTR_PAD) || 2949 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 2950 sum->InPktsUntagged, 2951 MACSEC_SECY_STATS_ATTR_PAD) || 2952 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 2953 sum->OutPktsTooLong, 2954 MACSEC_SECY_STATS_ATTR_PAD) || 2955 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 2956 sum->InPktsNoTag, 2957 MACSEC_SECY_STATS_ATTR_PAD) || 2958 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 2959 sum->InPktsBadTag, 2960 MACSEC_SECY_STATS_ATTR_PAD) || 2961 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 2962 sum->InPktsUnknownSCI, 2963 MACSEC_SECY_STATS_ATTR_PAD) || 2964 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 2965 sum->InPktsNoSCI, 2966 MACSEC_SECY_STATS_ATTR_PAD) || 2967 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 2968 sum->InPktsOverrun, 2969 MACSEC_SECY_STATS_ATTR_PAD)) 2970 return -EMSGSIZE; 2971 2972 return 0; 2973 } 2974 2975 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 2976 { 2977 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2978 struct nlattr *secy_nest = nla_nest_start_noflag(skb, 2979 MACSEC_ATTR_SECY); 2980 u64 csid; 2981 2982 if (!secy_nest) 2983 return 1; 2984 2985 switch (secy->key_len) { 2986 case MACSEC_GCM_AES_128_SAK_LEN: 2987 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 2988 break; 2989 case MACSEC_GCM_AES_256_SAK_LEN: 2990 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 2991 break; 2992 default: 2993 goto cancel; 2994 } 2995 2996 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 2997 MACSEC_SECY_ATTR_PAD) || 2998 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 2999 csid, MACSEC_SECY_ATTR_PAD) || 3000 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 3001 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 3002 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 3003 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 3004 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 3005 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 3006 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 3007 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 3008 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 3009 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 3010 goto cancel; 3011 3012 if (secy->replay_protect) { 3013 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 3014 goto cancel; 3015 } 3016 3017 nla_nest_end(skb, secy_nest); 3018 return 0; 3019 3020 cancel: 3021 nla_nest_cancel(skb, secy_nest); 3022 return 1; 3023 } 3024 3025 static noinline_for_stack int 3026 dump_secy(struct macsec_secy *secy, struct net_device *dev, 3027 struct sk_buff *skb, struct netlink_callback *cb) 3028 { 3029 struct macsec_tx_sc_stats tx_sc_stats = {0, }; 3030 struct macsec_tx_sa_stats tx_sa_stats = {0, }; 3031 struct macsec_rx_sc_stats rx_sc_stats = {0, }; 3032 struct macsec_rx_sa_stats rx_sa_stats = {0, }; 3033 struct macsec_dev *macsec = netdev_priv(dev); 3034 struct macsec_dev_stats dev_stats = {0, }; 3035 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3036 struct nlattr *txsa_list, *rxsc_list; 3037 struct macsec_rx_sc *rx_sc; 3038 struct nlattr *attr; 3039 void *hdr; 3040 int i, j; 3041 3042 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3043 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 3044 if (!hdr) 3045 return -EMSGSIZE; 3046 3047 genl_dump_check_consistent(cb, hdr); 3048 3049 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 3050 goto nla_put_failure; 3051 3052 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD); 3053 if (!attr) 3054 goto nla_put_failure; 3055 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload)) 3056 goto nla_put_failure; 3057 nla_nest_end(skb, attr); 3058 3059 if (nla_put_secy(secy, skb)) 3060 goto nla_put_failure; 3061 3062 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS); 3063 if (!attr) 3064 goto nla_put_failure; 3065 3066 get_tx_sc_stats(dev, &tx_sc_stats); 3067 if (copy_tx_sc_stats(skb, &tx_sc_stats)) { 3068 nla_nest_cancel(skb, attr); 3069 goto nla_put_failure; 3070 } 3071 nla_nest_end(skb, attr); 3072 3073 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS); 3074 if (!attr) 3075 goto nla_put_failure; 3076 get_secy_stats(dev, &dev_stats); 3077 if (copy_secy_stats(skb, &dev_stats)) { 3078 nla_nest_cancel(skb, attr); 3079 goto nla_put_failure; 3080 } 3081 nla_nest_end(skb, attr); 3082 3083 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST); 3084 if (!txsa_list) 3085 goto nla_put_failure; 3086 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 3087 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 3088 struct nlattr *txsa_nest; 3089 u64 pn; 3090 int pn_len; 3091 3092 if (!tx_sa) 3093 continue; 3094 3095 txsa_nest = nla_nest_start_noflag(skb, j++); 3096 if (!txsa_nest) { 3097 nla_nest_cancel(skb, txsa_list); 3098 goto nla_put_failure; 3099 } 3100 3101 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS); 3102 if (!attr) { 3103 nla_nest_cancel(skb, txsa_nest); 3104 nla_nest_cancel(skb, txsa_list); 3105 goto nla_put_failure; 3106 } 3107 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats)); 3108 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats); 3109 if (copy_tx_sa_stats(skb, &tx_sa_stats)) { 3110 nla_nest_cancel(skb, attr); 3111 nla_nest_cancel(skb, txsa_nest); 3112 nla_nest_cancel(skb, txsa_list); 3113 goto nla_put_failure; 3114 } 3115 nla_nest_end(skb, attr); 3116 3117 if (secy->xpn) { 3118 pn = tx_sa->next_pn; 3119 pn_len = MACSEC_XPN_PN_LEN; 3120 } else { 3121 pn = tx_sa->next_pn_halves.lower; 3122 pn_len = MACSEC_DEFAULT_PN_LEN; 3123 } 3124 3125 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3126 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3127 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 3128 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) || 3129 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 3130 nla_nest_cancel(skb, txsa_nest); 3131 nla_nest_cancel(skb, txsa_list); 3132 goto nla_put_failure; 3133 } 3134 3135 nla_nest_end(skb, txsa_nest); 3136 } 3137 nla_nest_end(skb, txsa_list); 3138 3139 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST); 3140 if (!rxsc_list) 3141 goto nla_put_failure; 3142 3143 j = 1; 3144 for_each_rxsc_rtnl(secy, rx_sc) { 3145 int k; 3146 struct nlattr *rxsa_list; 3147 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++); 3148 3149 if (!rxsc_nest) { 3150 nla_nest_cancel(skb, rxsc_list); 3151 goto nla_put_failure; 3152 } 3153 3154 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 3155 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 3156 MACSEC_RXSC_ATTR_PAD)) { 3157 nla_nest_cancel(skb, rxsc_nest); 3158 nla_nest_cancel(skb, rxsc_list); 3159 goto nla_put_failure; 3160 } 3161 3162 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS); 3163 if (!attr) { 3164 nla_nest_cancel(skb, rxsc_nest); 3165 nla_nest_cancel(skb, rxsc_list); 3166 goto nla_put_failure; 3167 } 3168 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats)); 3169 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats); 3170 if (copy_rx_sc_stats(skb, &rx_sc_stats)) { 3171 nla_nest_cancel(skb, attr); 3172 nla_nest_cancel(skb, rxsc_nest); 3173 nla_nest_cancel(skb, rxsc_list); 3174 goto nla_put_failure; 3175 } 3176 nla_nest_end(skb, attr); 3177 3178 rxsa_list = nla_nest_start_noflag(skb, 3179 MACSEC_RXSC_ATTR_SA_LIST); 3180 if (!rxsa_list) { 3181 nla_nest_cancel(skb, rxsc_nest); 3182 nla_nest_cancel(skb, rxsc_list); 3183 goto nla_put_failure; 3184 } 3185 3186 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 3187 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 3188 struct nlattr *rxsa_nest; 3189 u64 pn; 3190 int pn_len; 3191 3192 if (!rx_sa) 3193 continue; 3194 3195 rxsa_nest = nla_nest_start_noflag(skb, k++); 3196 if (!rxsa_nest) { 3197 nla_nest_cancel(skb, rxsa_list); 3198 nla_nest_cancel(skb, rxsc_nest); 3199 nla_nest_cancel(skb, rxsc_list); 3200 goto nla_put_failure; 3201 } 3202 3203 attr = nla_nest_start_noflag(skb, 3204 MACSEC_SA_ATTR_STATS); 3205 if (!attr) { 3206 nla_nest_cancel(skb, rxsa_list); 3207 nla_nest_cancel(skb, rxsc_nest); 3208 nla_nest_cancel(skb, rxsc_list); 3209 goto nla_put_failure; 3210 } 3211 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats)); 3212 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats); 3213 if (copy_rx_sa_stats(skb, &rx_sa_stats)) { 3214 nla_nest_cancel(skb, attr); 3215 nla_nest_cancel(skb, rxsa_list); 3216 nla_nest_cancel(skb, rxsc_nest); 3217 nla_nest_cancel(skb, rxsc_list); 3218 goto nla_put_failure; 3219 } 3220 nla_nest_end(skb, attr); 3221 3222 if (secy->xpn) { 3223 pn = rx_sa->next_pn; 3224 pn_len = MACSEC_XPN_PN_LEN; 3225 } else { 3226 pn = rx_sa->next_pn_halves.lower; 3227 pn_len = MACSEC_DEFAULT_PN_LEN; 3228 } 3229 3230 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3231 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3232 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 3233 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) || 3234 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 3235 nla_nest_cancel(skb, rxsa_nest); 3236 nla_nest_cancel(skb, rxsc_nest); 3237 nla_nest_cancel(skb, rxsc_list); 3238 goto nla_put_failure; 3239 } 3240 nla_nest_end(skb, rxsa_nest); 3241 } 3242 3243 nla_nest_end(skb, rxsa_list); 3244 nla_nest_end(skb, rxsc_nest); 3245 } 3246 3247 nla_nest_end(skb, rxsc_list); 3248 3249 genlmsg_end(skb, hdr); 3250 3251 return 0; 3252 3253 nla_put_failure: 3254 genlmsg_cancel(skb, hdr); 3255 return -EMSGSIZE; 3256 } 3257 3258 static int macsec_generation = 1; /* protected by RTNL */ 3259 3260 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 3261 { 3262 struct net *net = sock_net(skb->sk); 3263 struct net_device *dev; 3264 int dev_idx, d; 3265 3266 dev_idx = cb->args[0]; 3267 3268 d = 0; 3269 rtnl_lock(); 3270 3271 cb->seq = macsec_generation; 3272 3273 for_each_netdev(net, dev) { 3274 struct macsec_secy *secy; 3275 3276 if (d < dev_idx) 3277 goto next; 3278 3279 if (!netif_is_macsec(dev)) 3280 goto next; 3281 3282 secy = &macsec_priv(dev)->secy; 3283 if (dump_secy(secy, dev, skb, cb) < 0) 3284 goto done; 3285 next: 3286 d++; 3287 } 3288 3289 done: 3290 rtnl_unlock(); 3291 cb->args[0] = d; 3292 return skb->len; 3293 } 3294 3295 static const struct genl_small_ops macsec_genl_ops[] = { 3296 { 3297 .cmd = MACSEC_CMD_GET_TXSC, 3298 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3299 .dumpit = macsec_dump_txsc, 3300 }, 3301 { 3302 .cmd = MACSEC_CMD_ADD_RXSC, 3303 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3304 .doit = macsec_add_rxsc, 3305 .flags = GENL_ADMIN_PERM, 3306 }, 3307 { 3308 .cmd = MACSEC_CMD_DEL_RXSC, 3309 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3310 .doit = macsec_del_rxsc, 3311 .flags = GENL_ADMIN_PERM, 3312 }, 3313 { 3314 .cmd = MACSEC_CMD_UPD_RXSC, 3315 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3316 .doit = macsec_upd_rxsc, 3317 .flags = GENL_ADMIN_PERM, 3318 }, 3319 { 3320 .cmd = MACSEC_CMD_ADD_TXSA, 3321 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3322 .doit = macsec_add_txsa, 3323 .flags = GENL_ADMIN_PERM, 3324 }, 3325 { 3326 .cmd = MACSEC_CMD_DEL_TXSA, 3327 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3328 .doit = macsec_del_txsa, 3329 .flags = GENL_ADMIN_PERM, 3330 }, 3331 { 3332 .cmd = MACSEC_CMD_UPD_TXSA, 3333 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3334 .doit = macsec_upd_txsa, 3335 .flags = GENL_ADMIN_PERM, 3336 }, 3337 { 3338 .cmd = MACSEC_CMD_ADD_RXSA, 3339 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3340 .doit = macsec_add_rxsa, 3341 .flags = GENL_ADMIN_PERM, 3342 }, 3343 { 3344 .cmd = MACSEC_CMD_DEL_RXSA, 3345 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3346 .doit = macsec_del_rxsa, 3347 .flags = GENL_ADMIN_PERM, 3348 }, 3349 { 3350 .cmd = MACSEC_CMD_UPD_RXSA, 3351 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3352 .doit = macsec_upd_rxsa, 3353 .flags = GENL_ADMIN_PERM, 3354 }, 3355 { 3356 .cmd = MACSEC_CMD_UPD_OFFLOAD, 3357 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3358 .doit = macsec_upd_offload, 3359 .flags = GENL_ADMIN_PERM, 3360 }, 3361 }; 3362 3363 static struct genl_family macsec_fam __ro_after_init = { 3364 .name = MACSEC_GENL_NAME, 3365 .hdrsize = 0, 3366 .version = MACSEC_GENL_VERSION, 3367 .maxattr = MACSEC_ATTR_MAX, 3368 .policy = macsec_genl_policy, 3369 .netnsok = true, 3370 .module = THIS_MODULE, 3371 .small_ops = macsec_genl_ops, 3372 .n_small_ops = ARRAY_SIZE(macsec_genl_ops), 3373 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1, 3374 }; 3375 3376 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 3377 struct net_device *dev) 3378 { 3379 struct macsec_dev *macsec = netdev_priv(dev); 3380 struct macsec_secy *secy = &macsec->secy; 3381 struct pcpu_secy_stats *secy_stats; 3382 int ret, len; 3383 3384 if (macsec_is_offloaded(netdev_priv(dev))) { 3385 struct metadata_dst *md_dst = secy->tx_sc.md_dst; 3386 3387 skb_dst_drop(skb); 3388 dst_hold(&md_dst->dst); 3389 skb_dst_set(skb, &md_dst->dst); 3390 skb->dev = macsec->real_dev; 3391 return dev_queue_xmit(skb); 3392 } 3393 3394 /* 10.5 */ 3395 if (!secy->protect_frames) { 3396 secy_stats = this_cpu_ptr(macsec->stats); 3397 u64_stats_update_begin(&secy_stats->syncp); 3398 secy_stats->stats.OutPktsUntagged++; 3399 u64_stats_update_end(&secy_stats->syncp); 3400 skb->dev = macsec->real_dev; 3401 len = skb->len; 3402 ret = dev_queue_xmit(skb); 3403 count_tx(dev, ret, len); 3404 return ret; 3405 } 3406 3407 if (!secy->operational) { 3408 kfree_skb(skb); 3409 dev->stats.tx_dropped++; 3410 return NETDEV_TX_OK; 3411 } 3412 3413 len = skb->len; 3414 skb = macsec_encrypt(skb, dev); 3415 if (IS_ERR(skb)) { 3416 if (PTR_ERR(skb) != -EINPROGRESS) 3417 dev->stats.tx_dropped++; 3418 return NETDEV_TX_OK; 3419 } 3420 3421 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 3422 3423 macsec_encrypt_finish(skb, dev); 3424 ret = dev_queue_xmit(skb); 3425 count_tx(dev, ret, len); 3426 return ret; 3427 } 3428 3429 #define MACSEC_FEATURES \ 3430 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 3431 3432 static int macsec_dev_init(struct net_device *dev) 3433 { 3434 struct macsec_dev *macsec = macsec_priv(dev); 3435 struct net_device *real_dev = macsec->real_dev; 3436 int err; 3437 3438 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 3439 if (!dev->tstats) 3440 return -ENOMEM; 3441 3442 err = gro_cells_init(&macsec->gro_cells, dev); 3443 if (err) { 3444 free_percpu(dev->tstats); 3445 return err; 3446 } 3447 3448 dev->features = real_dev->features & MACSEC_FEATURES; 3449 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 3450 3451 dev->needed_headroom = real_dev->needed_headroom + 3452 MACSEC_NEEDED_HEADROOM; 3453 dev->needed_tailroom = real_dev->needed_tailroom + 3454 MACSEC_NEEDED_TAILROOM; 3455 3456 if (is_zero_ether_addr(dev->dev_addr)) 3457 eth_hw_addr_inherit(dev, real_dev); 3458 if (is_zero_ether_addr(dev->broadcast)) 3459 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 3460 3461 /* Get macsec's reference to real_dev */ 3462 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL); 3463 3464 return 0; 3465 } 3466 3467 static void macsec_dev_uninit(struct net_device *dev) 3468 { 3469 struct macsec_dev *macsec = macsec_priv(dev); 3470 3471 gro_cells_destroy(&macsec->gro_cells); 3472 free_percpu(dev->tstats); 3473 } 3474 3475 static netdev_features_t macsec_fix_features(struct net_device *dev, 3476 netdev_features_t features) 3477 { 3478 struct macsec_dev *macsec = macsec_priv(dev); 3479 struct net_device *real_dev = macsec->real_dev; 3480 3481 features &= (real_dev->features & MACSEC_FEATURES) | 3482 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 3483 features |= NETIF_F_LLTX; 3484 3485 return features; 3486 } 3487 3488 static int macsec_dev_open(struct net_device *dev) 3489 { 3490 struct macsec_dev *macsec = macsec_priv(dev); 3491 struct net_device *real_dev = macsec->real_dev; 3492 int err; 3493 3494 err = dev_uc_add(real_dev, dev->dev_addr); 3495 if (err < 0) 3496 return err; 3497 3498 if (dev->flags & IFF_ALLMULTI) { 3499 err = dev_set_allmulti(real_dev, 1); 3500 if (err < 0) 3501 goto del_unicast; 3502 } 3503 3504 if (dev->flags & IFF_PROMISC) { 3505 err = dev_set_promiscuity(real_dev, 1); 3506 if (err < 0) 3507 goto clear_allmulti; 3508 } 3509 3510 /* If h/w offloading is available, propagate to the device */ 3511 if (macsec_is_offloaded(macsec)) { 3512 const struct macsec_ops *ops; 3513 struct macsec_context ctx; 3514 3515 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3516 if (!ops) { 3517 err = -EOPNOTSUPP; 3518 goto clear_allmulti; 3519 } 3520 3521 ctx.secy = &macsec->secy; 3522 err = macsec_offload(ops->mdo_dev_open, &ctx); 3523 if (err) 3524 goto clear_allmulti; 3525 } 3526 3527 if (netif_carrier_ok(real_dev)) 3528 netif_carrier_on(dev); 3529 3530 return 0; 3531 clear_allmulti: 3532 if (dev->flags & IFF_ALLMULTI) 3533 dev_set_allmulti(real_dev, -1); 3534 del_unicast: 3535 dev_uc_del(real_dev, dev->dev_addr); 3536 netif_carrier_off(dev); 3537 return err; 3538 } 3539 3540 static int macsec_dev_stop(struct net_device *dev) 3541 { 3542 struct macsec_dev *macsec = macsec_priv(dev); 3543 struct net_device *real_dev = macsec->real_dev; 3544 3545 netif_carrier_off(dev); 3546 3547 /* If h/w offloading is available, propagate to the device */ 3548 if (macsec_is_offloaded(macsec)) { 3549 const struct macsec_ops *ops; 3550 struct macsec_context ctx; 3551 3552 ops = macsec_get_ops(macsec, &ctx); 3553 if (ops) { 3554 ctx.secy = &macsec->secy; 3555 macsec_offload(ops->mdo_dev_stop, &ctx); 3556 } 3557 } 3558 3559 dev_mc_unsync(real_dev, dev); 3560 dev_uc_unsync(real_dev, dev); 3561 3562 if (dev->flags & IFF_ALLMULTI) 3563 dev_set_allmulti(real_dev, -1); 3564 3565 if (dev->flags & IFF_PROMISC) 3566 dev_set_promiscuity(real_dev, -1); 3567 3568 dev_uc_del(real_dev, dev->dev_addr); 3569 3570 return 0; 3571 } 3572 3573 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 3574 { 3575 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3576 3577 if (!(dev->flags & IFF_UP)) 3578 return; 3579 3580 if (change & IFF_ALLMULTI) 3581 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 3582 3583 if (change & IFF_PROMISC) 3584 dev_set_promiscuity(real_dev, 3585 dev->flags & IFF_PROMISC ? 1 : -1); 3586 } 3587 3588 static void macsec_dev_set_rx_mode(struct net_device *dev) 3589 { 3590 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3591 3592 dev_mc_sync(real_dev, dev); 3593 dev_uc_sync(real_dev, dev); 3594 } 3595 3596 static int macsec_set_mac_address(struct net_device *dev, void *p) 3597 { 3598 struct macsec_dev *macsec = macsec_priv(dev); 3599 struct net_device *real_dev = macsec->real_dev; 3600 struct sockaddr *addr = p; 3601 int err; 3602 3603 if (!is_valid_ether_addr(addr->sa_data)) 3604 return -EADDRNOTAVAIL; 3605 3606 if (!(dev->flags & IFF_UP)) 3607 goto out; 3608 3609 err = dev_uc_add(real_dev, addr->sa_data); 3610 if (err < 0) 3611 return err; 3612 3613 dev_uc_del(real_dev, dev->dev_addr); 3614 3615 out: 3616 eth_hw_addr_set(dev, addr->sa_data); 3617 3618 /* If h/w offloading is available, propagate to the device */ 3619 if (macsec_is_offloaded(macsec)) { 3620 const struct macsec_ops *ops; 3621 struct macsec_context ctx; 3622 3623 ops = macsec_get_ops(macsec, &ctx); 3624 if (ops) { 3625 ctx.secy = &macsec->secy; 3626 macsec_offload(ops->mdo_upd_secy, &ctx); 3627 } 3628 } 3629 3630 return 0; 3631 } 3632 3633 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 3634 { 3635 struct macsec_dev *macsec = macsec_priv(dev); 3636 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 3637 3638 if (macsec->real_dev->mtu - extra < new_mtu) 3639 return -ERANGE; 3640 3641 dev->mtu = new_mtu; 3642 3643 return 0; 3644 } 3645 3646 static void macsec_get_stats64(struct net_device *dev, 3647 struct rtnl_link_stats64 *s) 3648 { 3649 if (!dev->tstats) 3650 return; 3651 3652 dev_fetch_sw_netstats(s, dev->tstats); 3653 3654 s->rx_dropped = dev->stats.rx_dropped; 3655 s->tx_dropped = dev->stats.tx_dropped; 3656 s->rx_errors = dev->stats.rx_errors; 3657 } 3658 3659 static int macsec_get_iflink(const struct net_device *dev) 3660 { 3661 return macsec_priv(dev)->real_dev->ifindex; 3662 } 3663 3664 static const struct net_device_ops macsec_netdev_ops = { 3665 .ndo_init = macsec_dev_init, 3666 .ndo_uninit = macsec_dev_uninit, 3667 .ndo_open = macsec_dev_open, 3668 .ndo_stop = macsec_dev_stop, 3669 .ndo_fix_features = macsec_fix_features, 3670 .ndo_change_mtu = macsec_change_mtu, 3671 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 3672 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 3673 .ndo_set_mac_address = macsec_set_mac_address, 3674 .ndo_start_xmit = macsec_start_xmit, 3675 .ndo_get_stats64 = macsec_get_stats64, 3676 .ndo_get_iflink = macsec_get_iflink, 3677 }; 3678 3679 static const struct device_type macsec_type = { 3680 .name = "macsec", 3681 }; 3682 3683 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 3684 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 3685 [IFLA_MACSEC_PORT] = { .type = NLA_U16 }, 3686 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 3687 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 3688 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 3689 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 3690 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 3691 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 3692 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 3693 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 3694 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 3695 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 3696 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 3697 }; 3698 3699 static void macsec_free_netdev(struct net_device *dev) 3700 { 3701 struct macsec_dev *macsec = macsec_priv(dev); 3702 3703 if (macsec->secy.tx_sc.md_dst) 3704 metadata_dst_free(macsec->secy.tx_sc.md_dst); 3705 free_percpu(macsec->stats); 3706 free_percpu(macsec->secy.tx_sc.stats); 3707 3708 /* Get rid of the macsec's reference to real_dev */ 3709 netdev_put(macsec->real_dev, &macsec->dev_tracker); 3710 } 3711 3712 static void macsec_setup(struct net_device *dev) 3713 { 3714 ether_setup(dev); 3715 dev->min_mtu = 0; 3716 dev->max_mtu = ETH_MAX_MTU; 3717 dev->priv_flags |= IFF_NO_QUEUE; 3718 dev->netdev_ops = &macsec_netdev_ops; 3719 dev->needs_free_netdev = true; 3720 dev->priv_destructor = macsec_free_netdev; 3721 SET_NETDEV_DEVTYPE(dev, &macsec_type); 3722 3723 eth_zero_addr(dev->broadcast); 3724 } 3725 3726 static int macsec_changelink_common(struct net_device *dev, 3727 struct nlattr *data[]) 3728 { 3729 struct macsec_secy *secy; 3730 struct macsec_tx_sc *tx_sc; 3731 3732 secy = &macsec_priv(dev)->secy; 3733 tx_sc = &secy->tx_sc; 3734 3735 if (data[IFLA_MACSEC_ENCODING_SA]) { 3736 struct macsec_tx_sa *tx_sa; 3737 3738 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3739 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 3740 3741 secy->operational = tx_sa && tx_sa->active; 3742 } 3743 3744 if (data[IFLA_MACSEC_ENCRYPT]) 3745 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3746 3747 if (data[IFLA_MACSEC_PROTECT]) 3748 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3749 3750 if (data[IFLA_MACSEC_INC_SCI]) 3751 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3752 3753 if (data[IFLA_MACSEC_ES]) 3754 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3755 3756 if (data[IFLA_MACSEC_SCB]) 3757 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3758 3759 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3760 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3761 3762 if (data[IFLA_MACSEC_VALIDATION]) 3763 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3764 3765 if (data[IFLA_MACSEC_CIPHER_SUITE]) { 3766 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) { 3767 case MACSEC_CIPHER_ID_GCM_AES_128: 3768 case MACSEC_DEFAULT_CIPHER_ID: 3769 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3770 secy->xpn = false; 3771 break; 3772 case MACSEC_CIPHER_ID_GCM_AES_256: 3773 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3774 secy->xpn = false; 3775 break; 3776 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 3777 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3778 secy->xpn = true; 3779 break; 3780 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 3781 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3782 secy->xpn = true; 3783 break; 3784 default: 3785 return -EINVAL; 3786 } 3787 } 3788 3789 if (data[IFLA_MACSEC_WINDOW]) { 3790 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3791 3792 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window 3793 * for XPN cipher suites */ 3794 if (secy->xpn && 3795 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW) 3796 return -EINVAL; 3797 } 3798 3799 return 0; 3800 } 3801 3802 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3803 struct nlattr *data[], 3804 struct netlink_ext_ack *extack) 3805 { 3806 struct macsec_dev *macsec = macsec_priv(dev); 3807 struct macsec_tx_sc tx_sc; 3808 struct macsec_secy secy; 3809 int ret; 3810 3811 if (!data) 3812 return 0; 3813 3814 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3815 data[IFLA_MACSEC_ICV_LEN] || 3816 data[IFLA_MACSEC_SCI] || 3817 data[IFLA_MACSEC_PORT]) 3818 return -EINVAL; 3819 3820 /* Keep a copy of unmodified secy and tx_sc, in case the offload 3821 * propagation fails, to revert macsec_changelink_common. 3822 */ 3823 memcpy(&secy, &macsec->secy, sizeof(secy)); 3824 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc)); 3825 3826 ret = macsec_changelink_common(dev, data); 3827 if (ret) 3828 goto cleanup; 3829 3830 /* If h/w offloading is available, propagate to the device */ 3831 if (macsec_is_offloaded(macsec)) { 3832 const struct macsec_ops *ops; 3833 struct macsec_context ctx; 3834 int ret; 3835 3836 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3837 if (!ops) { 3838 ret = -EOPNOTSUPP; 3839 goto cleanup; 3840 } 3841 3842 ctx.secy = &macsec->secy; 3843 ret = macsec_offload(ops->mdo_upd_secy, &ctx); 3844 if (ret) 3845 goto cleanup; 3846 } 3847 3848 return 0; 3849 3850 cleanup: 3851 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc)); 3852 memcpy(&macsec->secy, &secy, sizeof(secy)); 3853 3854 return ret; 3855 } 3856 3857 static void macsec_del_dev(struct macsec_dev *macsec) 3858 { 3859 int i; 3860 3861 while (macsec->secy.rx_sc) { 3862 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 3863 3864 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 3865 free_rx_sc(rx_sc); 3866 } 3867 3868 for (i = 0; i < MACSEC_NUM_AN; i++) { 3869 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 3870 3871 if (sa) { 3872 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 3873 clear_tx_sa(sa); 3874 } 3875 } 3876 } 3877 3878 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 3879 { 3880 struct macsec_dev *macsec = macsec_priv(dev); 3881 struct net_device *real_dev = macsec->real_dev; 3882 3883 /* If h/w offloading is available, propagate to the device */ 3884 if (macsec_is_offloaded(macsec)) { 3885 const struct macsec_ops *ops; 3886 struct macsec_context ctx; 3887 3888 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3889 if (ops) { 3890 ctx.secy = &macsec->secy; 3891 macsec_offload(ops->mdo_del_secy, &ctx); 3892 } 3893 } 3894 3895 unregister_netdevice_queue(dev, head); 3896 list_del_rcu(&macsec->secys); 3897 macsec_del_dev(macsec); 3898 netdev_upper_dev_unlink(real_dev, dev); 3899 3900 macsec_generation++; 3901 } 3902 3903 static void macsec_dellink(struct net_device *dev, struct list_head *head) 3904 { 3905 struct macsec_dev *macsec = macsec_priv(dev); 3906 struct net_device *real_dev = macsec->real_dev; 3907 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3908 3909 macsec_common_dellink(dev, head); 3910 3911 if (list_empty(&rxd->secys)) { 3912 netdev_rx_handler_unregister(real_dev); 3913 kfree(rxd); 3914 } 3915 } 3916 3917 static int register_macsec_dev(struct net_device *real_dev, 3918 struct net_device *dev) 3919 { 3920 struct macsec_dev *macsec = macsec_priv(dev); 3921 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3922 3923 if (!rxd) { 3924 int err; 3925 3926 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 3927 if (!rxd) 3928 return -ENOMEM; 3929 3930 INIT_LIST_HEAD(&rxd->secys); 3931 3932 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 3933 rxd); 3934 if (err < 0) { 3935 kfree(rxd); 3936 return err; 3937 } 3938 } 3939 3940 list_add_tail_rcu(&macsec->secys, &rxd->secys); 3941 return 0; 3942 } 3943 3944 static bool sci_exists(struct net_device *dev, sci_t sci) 3945 { 3946 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 3947 struct macsec_dev *macsec; 3948 3949 list_for_each_entry(macsec, &rxd->secys, secys) { 3950 if (macsec->secy.sci == sci) 3951 return true; 3952 } 3953 3954 return false; 3955 } 3956 3957 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 3958 { 3959 return make_sci(dev->dev_addr, port); 3960 } 3961 3962 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 3963 { 3964 struct macsec_dev *macsec = macsec_priv(dev); 3965 struct macsec_secy *secy = &macsec->secy; 3966 3967 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 3968 if (!macsec->stats) 3969 return -ENOMEM; 3970 3971 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 3972 if (!secy->tx_sc.stats) { 3973 free_percpu(macsec->stats); 3974 return -ENOMEM; 3975 } 3976 3977 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL); 3978 if (!secy->tx_sc.md_dst) { 3979 free_percpu(secy->tx_sc.stats); 3980 free_percpu(macsec->stats); 3981 return -ENOMEM; 3982 } 3983 3984 if (sci == MACSEC_UNDEF_SCI) 3985 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3986 3987 secy->netdev = dev; 3988 secy->operational = true; 3989 secy->key_len = DEFAULT_SAK_LEN; 3990 secy->icv_len = icv_len; 3991 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 3992 secy->protect_frames = true; 3993 secy->replay_protect = false; 3994 secy->xpn = DEFAULT_XPN; 3995 3996 secy->sci = sci; 3997 secy->tx_sc.md_dst->u.macsec_info.sci = sci; 3998 secy->tx_sc.active = true; 3999 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 4000 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 4001 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 4002 secy->tx_sc.end_station = false; 4003 secy->tx_sc.scb = false; 4004 4005 return 0; 4006 } 4007 4008 static struct lock_class_key macsec_netdev_addr_lock_key; 4009 4010 static int macsec_newlink(struct net *net, struct net_device *dev, 4011 struct nlattr *tb[], struct nlattr *data[], 4012 struct netlink_ext_ack *extack) 4013 { 4014 struct macsec_dev *macsec = macsec_priv(dev); 4015 rx_handler_func_t *rx_handler; 4016 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4017 struct net_device *real_dev; 4018 int err, mtu; 4019 sci_t sci; 4020 4021 if (!tb[IFLA_LINK]) 4022 return -EINVAL; 4023 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 4024 if (!real_dev) 4025 return -ENODEV; 4026 if (real_dev->type != ARPHRD_ETHER) 4027 return -EINVAL; 4028 4029 dev->priv_flags |= IFF_MACSEC; 4030 4031 macsec->real_dev = real_dev; 4032 4033 if (data && data[IFLA_MACSEC_OFFLOAD]) 4034 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]); 4035 else 4036 /* MACsec offloading is off by default */ 4037 macsec->offload = MACSEC_OFFLOAD_OFF; 4038 4039 /* Check if the offloading mode is supported by the underlying layers */ 4040 if (macsec->offload != MACSEC_OFFLOAD_OFF && 4041 !macsec_check_offload(macsec->offload, macsec)) 4042 return -EOPNOTSUPP; 4043 4044 /* send_sci must be set to true when transmit sci explicitly is set */ 4045 if ((data && data[IFLA_MACSEC_SCI]) && 4046 (data && data[IFLA_MACSEC_INC_SCI])) { 4047 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 4048 4049 if (!send_sci) 4050 return -EINVAL; 4051 } 4052 4053 if (data && data[IFLA_MACSEC_ICV_LEN]) 4054 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4055 mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 4056 if (mtu < 0) 4057 dev->mtu = 0; 4058 else 4059 dev->mtu = mtu; 4060 4061 rx_handler = rtnl_dereference(real_dev->rx_handler); 4062 if (rx_handler && rx_handler != macsec_handle_frame) 4063 return -EBUSY; 4064 4065 err = register_netdevice(dev); 4066 if (err < 0) 4067 return err; 4068 4069 netdev_lockdep_set_classes(dev); 4070 lockdep_set_class(&dev->addr_list_lock, 4071 &macsec_netdev_addr_lock_key); 4072 4073 err = netdev_upper_dev_link(real_dev, dev, extack); 4074 if (err < 0) 4075 goto unregister; 4076 4077 /* need to be already registered so that ->init has run and 4078 * the MAC addr is set 4079 */ 4080 if (data && data[IFLA_MACSEC_SCI]) 4081 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 4082 else if (data && data[IFLA_MACSEC_PORT]) 4083 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 4084 else 4085 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4086 4087 if (rx_handler && sci_exists(real_dev, sci)) { 4088 err = -EBUSY; 4089 goto unlink; 4090 } 4091 4092 err = macsec_add_dev(dev, sci, icv_len); 4093 if (err) 4094 goto unlink; 4095 4096 if (data) { 4097 err = macsec_changelink_common(dev, data); 4098 if (err) 4099 goto del_dev; 4100 } 4101 4102 /* If h/w offloading is available, propagate to the device */ 4103 if (macsec_is_offloaded(macsec)) { 4104 const struct macsec_ops *ops; 4105 struct macsec_context ctx; 4106 4107 ops = macsec_get_ops(macsec, &ctx); 4108 if (ops) { 4109 ctx.secy = &macsec->secy; 4110 err = macsec_offload(ops->mdo_add_secy, &ctx); 4111 if (err) 4112 goto del_dev; 4113 } 4114 } 4115 4116 err = register_macsec_dev(real_dev, dev); 4117 if (err < 0) 4118 goto del_dev; 4119 4120 netif_stacked_transfer_operstate(real_dev, dev); 4121 linkwatch_fire_event(dev); 4122 4123 macsec_generation++; 4124 4125 return 0; 4126 4127 del_dev: 4128 macsec_del_dev(macsec); 4129 unlink: 4130 netdev_upper_dev_unlink(real_dev, dev); 4131 unregister: 4132 unregister_netdevice(dev); 4133 return err; 4134 } 4135 4136 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], 4137 struct netlink_ext_ack *extack) 4138 { 4139 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 4140 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4141 int flag; 4142 bool es, scb, sci; 4143 4144 if (!data) 4145 return 0; 4146 4147 if (data[IFLA_MACSEC_CIPHER_SUITE]) 4148 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 4149 4150 if (data[IFLA_MACSEC_ICV_LEN]) { 4151 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4152 if (icv_len != MACSEC_DEFAULT_ICV_LEN) { 4153 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 4154 struct crypto_aead *dummy_tfm; 4155 4156 dummy_tfm = macsec_alloc_tfm(dummy_key, 4157 DEFAULT_SAK_LEN, 4158 icv_len); 4159 if (IS_ERR(dummy_tfm)) 4160 return PTR_ERR(dummy_tfm); 4161 crypto_free_aead(dummy_tfm); 4162 } 4163 } 4164 4165 switch (csid) { 4166 case MACSEC_CIPHER_ID_GCM_AES_128: 4167 case MACSEC_CIPHER_ID_GCM_AES_256: 4168 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 4169 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 4170 case MACSEC_DEFAULT_CIPHER_ID: 4171 if (icv_len < MACSEC_MIN_ICV_LEN || 4172 icv_len > MACSEC_STD_ICV_LEN) 4173 return -EINVAL; 4174 break; 4175 default: 4176 return -EINVAL; 4177 } 4178 4179 if (data[IFLA_MACSEC_ENCODING_SA]) { 4180 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 4181 return -EINVAL; 4182 } 4183 4184 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 4185 flag < IFLA_MACSEC_VALIDATION; 4186 flag++) { 4187 if (data[flag]) { 4188 if (nla_get_u8(data[flag]) > 1) 4189 return -EINVAL; 4190 } 4191 } 4192 4193 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 4194 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 4195 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 4196 4197 if ((sci && (scb || es)) || (scb && es)) 4198 return -EINVAL; 4199 4200 if (data[IFLA_MACSEC_VALIDATION] && 4201 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 4202 return -EINVAL; 4203 4204 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 4205 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 4206 !data[IFLA_MACSEC_WINDOW]) 4207 return -EINVAL; 4208 4209 return 0; 4210 } 4211 4212 static struct net *macsec_get_link_net(const struct net_device *dev) 4213 { 4214 return dev_net(macsec_priv(dev)->real_dev); 4215 } 4216 4217 static size_t macsec_get_size(const struct net_device *dev) 4218 { 4219 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ 4220 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ 4221 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ 4222 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ 4223 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ 4224 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ 4225 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ 4226 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ 4227 nla_total_size(1) + /* IFLA_MACSEC_ES */ 4228 nla_total_size(1) + /* IFLA_MACSEC_SCB */ 4229 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ 4230 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ 4231 0; 4232 } 4233 4234 static int macsec_fill_info(struct sk_buff *skb, 4235 const struct net_device *dev) 4236 { 4237 struct macsec_secy *secy = &macsec_priv(dev)->secy; 4238 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 4239 u64 csid; 4240 4241 switch (secy->key_len) { 4242 case MACSEC_GCM_AES_128_SAK_LEN: 4243 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 4244 break; 4245 case MACSEC_GCM_AES_256_SAK_LEN: 4246 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 4247 break; 4248 default: 4249 goto nla_put_failure; 4250 } 4251 4252 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 4253 IFLA_MACSEC_PAD) || 4254 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 4255 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 4256 csid, IFLA_MACSEC_PAD) || 4257 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 4258 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 4259 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 4260 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 4261 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 4262 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 4263 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 4264 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 4265 0) 4266 goto nla_put_failure; 4267 4268 if (secy->replay_protect) { 4269 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 4270 goto nla_put_failure; 4271 } 4272 4273 return 0; 4274 4275 nla_put_failure: 4276 return -EMSGSIZE; 4277 } 4278 4279 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 4280 .kind = "macsec", 4281 .priv_size = sizeof(struct macsec_dev), 4282 .maxtype = IFLA_MACSEC_MAX, 4283 .policy = macsec_rtnl_policy, 4284 .setup = macsec_setup, 4285 .validate = macsec_validate_attr, 4286 .newlink = macsec_newlink, 4287 .changelink = macsec_changelink, 4288 .dellink = macsec_dellink, 4289 .get_size = macsec_get_size, 4290 .fill_info = macsec_fill_info, 4291 .get_link_net = macsec_get_link_net, 4292 }; 4293 4294 static bool is_macsec_master(struct net_device *dev) 4295 { 4296 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 4297 } 4298 4299 static int macsec_notify(struct notifier_block *this, unsigned long event, 4300 void *ptr) 4301 { 4302 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 4303 LIST_HEAD(head); 4304 4305 if (!is_macsec_master(real_dev)) 4306 return NOTIFY_DONE; 4307 4308 switch (event) { 4309 case NETDEV_DOWN: 4310 case NETDEV_UP: 4311 case NETDEV_CHANGE: { 4312 struct macsec_dev *m, *n; 4313 struct macsec_rxh_data *rxd; 4314 4315 rxd = macsec_data_rtnl(real_dev); 4316 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4317 struct net_device *dev = m->secy.netdev; 4318 4319 netif_stacked_transfer_operstate(real_dev, dev); 4320 } 4321 break; 4322 } 4323 case NETDEV_UNREGISTER: { 4324 struct macsec_dev *m, *n; 4325 struct macsec_rxh_data *rxd; 4326 4327 rxd = macsec_data_rtnl(real_dev); 4328 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4329 macsec_common_dellink(m->secy.netdev, &head); 4330 } 4331 4332 netdev_rx_handler_unregister(real_dev); 4333 kfree(rxd); 4334 4335 unregister_netdevice_many(&head); 4336 break; 4337 } 4338 case NETDEV_CHANGEMTU: { 4339 struct macsec_dev *m; 4340 struct macsec_rxh_data *rxd; 4341 4342 rxd = macsec_data_rtnl(real_dev); 4343 list_for_each_entry(m, &rxd->secys, secys) { 4344 struct net_device *dev = m->secy.netdev; 4345 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 4346 macsec_extra_len(true)); 4347 4348 if (dev->mtu > mtu) 4349 dev_set_mtu(dev, mtu); 4350 } 4351 } 4352 } 4353 4354 return NOTIFY_OK; 4355 } 4356 4357 static struct notifier_block macsec_notifier = { 4358 .notifier_call = macsec_notify, 4359 }; 4360 4361 static int __init macsec_init(void) 4362 { 4363 int err; 4364 4365 pr_info("MACsec IEEE 802.1AE\n"); 4366 err = register_netdevice_notifier(&macsec_notifier); 4367 if (err) 4368 return err; 4369 4370 err = rtnl_link_register(&macsec_link_ops); 4371 if (err) 4372 goto notifier; 4373 4374 err = genl_register_family(&macsec_fam); 4375 if (err) 4376 goto rtnl; 4377 4378 return 0; 4379 4380 rtnl: 4381 rtnl_link_unregister(&macsec_link_ops); 4382 notifier: 4383 unregister_netdevice_notifier(&macsec_notifier); 4384 return err; 4385 } 4386 4387 static void __exit macsec_exit(void) 4388 { 4389 genl_unregister_family(&macsec_fam); 4390 rtnl_link_unregister(&macsec_link_ops); 4391 unregister_netdevice_notifier(&macsec_notifier); 4392 rcu_barrier(); 4393 } 4394 4395 module_init(macsec_init); 4396 module_exit(macsec_exit); 4397 4398 MODULE_ALIAS_RTNL_LINK("macsec"); 4399 MODULE_ALIAS_GENL_FAMILY("macsec"); 4400 4401 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 4402 MODULE_LICENSE("GPL v2"); 4403