1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * drivers/net/macsec.c - MACsec device 4 * 5 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net> 6 */ 7 8 #include <linux/types.h> 9 #include <linux/skbuff.h> 10 #include <linux/socket.h> 11 #include <linux/module.h> 12 #include <crypto/aead.h> 13 #include <linux/etherdevice.h> 14 #include <linux/netdevice.h> 15 #include <linux/rtnetlink.h> 16 #include <linux/refcount.h> 17 #include <net/genetlink.h> 18 #include <net/sock.h> 19 #include <net/gro_cells.h> 20 #include <net/macsec.h> 21 #include <net/dst_metadata.h> 22 #include <net/netdev_lock.h> 23 #include <linux/phy.h> 24 #include <linux/byteorder/generic.h> 25 #include <linux/if_arp.h> 26 27 #include <uapi/linux/if_macsec.h> 28 29 /* SecTAG length = macsec_eth_header without the optional SCI */ 30 #define MACSEC_TAG_LEN 6 31 32 struct macsec_eth_header { 33 struct ethhdr eth; 34 /* SecTAG */ 35 u8 tci_an; 36 #if defined(__LITTLE_ENDIAN_BITFIELD) 37 u8 short_length:6, 38 unused:2; 39 #elif defined(__BIG_ENDIAN_BITFIELD) 40 u8 unused:2, 41 short_length:6; 42 #else 43 #error "Please fix <asm/byteorder.h>" 44 #endif 45 __be32 packet_number; 46 u8 secure_channel_id[8]; /* optional */ 47 } __packed; 48 49 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */ 50 #define MIN_NON_SHORT_LEN 48 51 52 #define GCM_AES_IV_LEN 12 53 54 #define for_each_rxsc(secy, sc) \ 55 for (sc = rcu_dereference_bh(secy->rx_sc); \ 56 sc; \ 57 sc = rcu_dereference_bh(sc->next)) 58 #define for_each_rxsc_rtnl(secy, sc) \ 59 for (sc = rtnl_dereference(secy->rx_sc); \ 60 sc; \ 61 sc = rtnl_dereference(sc->next)) 62 63 #define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31))) 64 65 struct gcm_iv_xpn { 66 union { 67 u8 short_secure_channel_id[4]; 68 ssci_t ssci; 69 }; 70 __be64 pn; 71 } __packed; 72 73 struct gcm_iv { 74 union { 75 u8 secure_channel_id[8]; 76 sci_t sci; 77 }; 78 __be32 pn; 79 }; 80 81 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT 82 83 struct pcpu_secy_stats { 84 struct macsec_dev_stats stats; 85 struct u64_stats_sync syncp; 86 }; 87 88 /** 89 * struct macsec_dev - private data 90 * @secy: SecY config 91 * @real_dev: pointer to underlying netdevice 92 * @dev_tracker: refcount tracker for @real_dev reference 93 * @stats: MACsec device stats 94 * @secys: linked list of SecY's on the underlying device 95 * @gro_cells: pointer to the Generic Receive Offload cell 96 * @offload: status of offloading on the MACsec device 97 * @insert_tx_tag: when offloading, device requires to insert an 98 * additional tag 99 */ 100 struct macsec_dev { 101 struct macsec_secy secy; 102 struct net_device *real_dev; 103 netdevice_tracker dev_tracker; 104 struct pcpu_secy_stats __percpu *stats; 105 struct list_head secys; 106 struct gro_cells gro_cells; 107 enum macsec_offload offload; 108 bool insert_tx_tag; 109 }; 110 111 /** 112 * struct macsec_rxh_data - rx_handler private argument 113 * @secys: linked list of SecY's on this underlying device 114 */ 115 struct macsec_rxh_data { 116 struct list_head secys; 117 }; 118 119 static struct macsec_dev *macsec_priv(const struct net_device *dev) 120 { 121 return (struct macsec_dev *)netdev_priv(dev); 122 } 123 124 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev) 125 { 126 return rcu_dereference_bh(dev->rx_handler_data); 127 } 128 129 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev) 130 { 131 return rtnl_dereference(dev->rx_handler_data); 132 } 133 134 struct macsec_cb { 135 struct aead_request *req; 136 union { 137 struct macsec_tx_sa *tx_sa; 138 struct macsec_rx_sa *rx_sa; 139 }; 140 u8 assoc_num; 141 bool valid; 142 bool has_sci; 143 }; 144 145 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr) 146 { 147 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr); 148 149 if (!sa || !sa->active) 150 return NULL; 151 152 if (!refcount_inc_not_zero(&sa->refcnt)) 153 return NULL; 154 155 return sa; 156 } 157 158 static void free_rx_sc_rcu(struct rcu_head *head) 159 { 160 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head); 161 162 free_percpu(rx_sc->stats); 163 kfree(rx_sc); 164 } 165 166 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc) 167 { 168 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL; 169 } 170 171 static void macsec_rxsc_put(struct macsec_rx_sc *sc) 172 { 173 if (refcount_dec_and_test(&sc->refcnt)) 174 call_rcu(&sc->rcu_head, free_rx_sc_rcu); 175 } 176 177 static void free_rxsa(struct rcu_head *head) 178 { 179 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu); 180 181 crypto_free_aead(sa->key.tfm); 182 free_percpu(sa->stats); 183 kfree(sa); 184 } 185 186 static void macsec_rxsa_put(struct macsec_rx_sa *sa) 187 { 188 if (refcount_dec_and_test(&sa->refcnt)) 189 call_rcu(&sa->rcu, free_rxsa); 190 } 191 192 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr) 193 { 194 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr); 195 196 if (!sa || !sa->active) 197 return NULL; 198 199 if (!refcount_inc_not_zero(&sa->refcnt)) 200 return NULL; 201 202 return sa; 203 } 204 205 static void free_txsa(struct rcu_head *head) 206 { 207 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu); 208 209 crypto_free_aead(sa->key.tfm); 210 free_percpu(sa->stats); 211 kfree(sa); 212 } 213 214 static void macsec_txsa_put(struct macsec_tx_sa *sa) 215 { 216 if (refcount_dec_and_test(&sa->refcnt)) 217 call_rcu(&sa->rcu, free_txsa); 218 } 219 220 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) 221 { 222 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); 223 return (struct macsec_cb *)skb->cb; 224 } 225 226 #define MACSEC_PORT_SCB (0x0000) 227 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL) 228 #define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff) 229 230 #define MACSEC_GCM_AES_128_SAK_LEN 16 231 #define MACSEC_GCM_AES_256_SAK_LEN 32 232 233 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN 234 #define DEFAULT_XPN false 235 #define DEFAULT_SEND_SCI true 236 #define DEFAULT_ENCRYPT false 237 #define DEFAULT_ENCODING_SA 0 238 #define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1)) 239 240 static sci_t make_sci(const u8 *addr, __be16 port) 241 { 242 sci_t sci; 243 244 memcpy(&sci, addr, ETH_ALEN); 245 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); 246 247 return sci; 248 } 249 250 static sci_t macsec_active_sci(struct macsec_secy *secy) 251 { 252 struct macsec_rx_sc *rx_sc = rcu_dereference_bh(secy->rx_sc); 253 254 /* Case single RX SC */ 255 if (rx_sc && !rcu_dereference_bh(rx_sc->next)) 256 return (rx_sc->active) ? rx_sc->sci : 0; 257 /* Case no RX SC or multiple */ 258 else 259 return 0; 260 } 261 262 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present, 263 struct macsec_rxh_data *rxd) 264 { 265 struct macsec_dev *macsec; 266 sci_t sci = 0; 267 268 /* SC = 1 */ 269 if (sci_present) { 270 memcpy(&sci, hdr->secure_channel_id, 271 sizeof(hdr->secure_channel_id)); 272 /* SC = 0; ES = 0 */ 273 } else if ((!(hdr->tci_an & (MACSEC_TCI_ES | MACSEC_TCI_SC))) && 274 (list_is_singular(&rxd->secys))) { 275 /* Only one SECY should exist on this scenario */ 276 macsec = list_first_or_null_rcu(&rxd->secys, struct macsec_dev, 277 secys); 278 if (macsec) 279 return macsec_active_sci(&macsec->secy); 280 } else { 281 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); 282 } 283 284 return sci; 285 } 286 287 static unsigned int macsec_sectag_len(bool sci_present) 288 { 289 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); 290 } 291 292 static unsigned int macsec_hdr_len(bool sci_present) 293 { 294 return macsec_sectag_len(sci_present) + ETH_HLEN; 295 } 296 297 static unsigned int macsec_extra_len(bool sci_present) 298 { 299 return macsec_sectag_len(sci_present) + sizeof(__be16); 300 } 301 302 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ 303 static void macsec_fill_sectag(struct macsec_eth_header *h, 304 const struct macsec_secy *secy, u32 pn, 305 bool sci_present) 306 { 307 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 308 309 memset(&h->tci_an, 0, macsec_sectag_len(sci_present)); 310 h->eth.h_proto = htons(ETH_P_MACSEC); 311 312 if (sci_present) { 313 h->tci_an |= MACSEC_TCI_SC; 314 memcpy(&h->secure_channel_id, &secy->sci, 315 sizeof(h->secure_channel_id)); 316 } else { 317 if (tx_sc->end_station) 318 h->tci_an |= MACSEC_TCI_ES; 319 if (tx_sc->scb) 320 h->tci_an |= MACSEC_TCI_SCB; 321 } 322 323 h->packet_number = htonl(pn); 324 325 /* with GCM, C/E clear for !encrypt, both set for encrypt */ 326 if (tx_sc->encrypt) 327 h->tci_an |= MACSEC_TCI_CONFID; 328 else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN) 329 h->tci_an |= MACSEC_TCI_C; 330 331 h->tci_an |= tx_sc->encoding_sa; 332 } 333 334 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) 335 { 336 if (data_len < MIN_NON_SHORT_LEN) 337 h->short_length = data_len; 338 } 339 340 /* Checks if a MACsec interface is being offloaded to an hardware engine */ 341 static bool macsec_is_offloaded(struct macsec_dev *macsec) 342 { 343 if (macsec->offload == MACSEC_OFFLOAD_MAC || 344 macsec->offload == MACSEC_OFFLOAD_PHY) 345 return true; 346 347 return false; 348 } 349 350 /* Checks if underlying layers implement MACsec offloading functions. */ 351 static bool macsec_check_offload(enum macsec_offload offload, 352 struct macsec_dev *macsec) 353 { 354 if (!macsec || !macsec->real_dev) 355 return false; 356 357 if (offload == MACSEC_OFFLOAD_PHY) 358 return macsec->real_dev->phydev && 359 macsec->real_dev->phydev->macsec_ops; 360 else if (offload == MACSEC_OFFLOAD_MAC) 361 return macsec->real_dev->features & NETIF_F_HW_MACSEC && 362 macsec->real_dev->macsec_ops; 363 364 return false; 365 } 366 367 static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload, 368 struct macsec_dev *macsec, 369 struct macsec_context *ctx) 370 { 371 if (ctx) { 372 memset(ctx, 0, sizeof(*ctx)); 373 ctx->offload = offload; 374 375 if (offload == MACSEC_OFFLOAD_PHY) 376 ctx->phydev = macsec->real_dev->phydev; 377 else if (offload == MACSEC_OFFLOAD_MAC) 378 ctx->netdev = macsec->real_dev; 379 } 380 381 if (offload == MACSEC_OFFLOAD_PHY) 382 return macsec->real_dev->phydev->macsec_ops; 383 else 384 return macsec->real_dev->macsec_ops; 385 } 386 387 /* Returns a pointer to the MACsec ops struct if any and updates the MACsec 388 * context device reference if provided. 389 */ 390 static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec, 391 struct macsec_context *ctx) 392 { 393 if (!macsec_check_offload(macsec->offload, macsec)) 394 return NULL; 395 396 return __macsec_get_ops(macsec->offload, macsec, ctx); 397 } 398 399 /* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */ 400 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn) 401 { 402 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; 403 int len = skb->len - 2 * ETH_ALEN; 404 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; 405 406 /* a) It comprises at least 17 octets */ 407 if (skb->len <= 16) 408 return false; 409 410 /* b) MACsec EtherType: already checked */ 411 412 /* c) V bit is clear */ 413 if (h->tci_an & MACSEC_TCI_VERSION) 414 return false; 415 416 /* d) ES or SCB => !SC */ 417 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && 418 (h->tci_an & MACSEC_TCI_SC)) 419 return false; 420 421 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ 422 if (h->unused) 423 return false; 424 425 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */ 426 if (!h->packet_number && !xpn) 427 return false; 428 429 /* length check, f) g) h) i) */ 430 if (h->short_length) 431 return len == extra_len + h->short_length; 432 return len >= extra_len + MIN_NON_SHORT_LEN; 433 } 434 435 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) 436 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN 437 438 static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn, 439 salt_t salt) 440 { 441 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv; 442 443 gcm_iv->ssci = ssci ^ salt.ssci; 444 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn; 445 } 446 447 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) 448 { 449 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; 450 451 gcm_iv->sci = sci; 452 gcm_iv->pn = htonl(pn); 453 } 454 455 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) 456 { 457 return (struct macsec_eth_header *)skb_mac_header(skb); 458 } 459 460 static void __macsec_pn_wrapped(struct macsec_secy *secy, 461 struct macsec_tx_sa *tx_sa) 462 { 463 pr_debug("PN wrapped, transitioning to !oper\n"); 464 tx_sa->active = false; 465 if (secy->protect_frames) 466 secy->operational = false; 467 } 468 469 void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa) 470 { 471 spin_lock_bh(&tx_sa->lock); 472 __macsec_pn_wrapped(secy, tx_sa); 473 spin_unlock_bh(&tx_sa->lock); 474 } 475 EXPORT_SYMBOL_GPL(macsec_pn_wrapped); 476 477 static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa, 478 struct macsec_secy *secy) 479 { 480 pn_t pn; 481 482 spin_lock_bh(&tx_sa->lock); 483 484 pn = tx_sa->next_pn_halves; 485 if (secy->xpn) 486 tx_sa->next_pn++; 487 else 488 tx_sa->next_pn_halves.lower++; 489 490 if (tx_sa->next_pn == 0) 491 __macsec_pn_wrapped(secy, tx_sa); 492 spin_unlock_bh(&tx_sa->lock); 493 494 return pn; 495 } 496 497 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) 498 { 499 struct macsec_dev *macsec = netdev_priv(dev); 500 501 skb->dev = macsec->real_dev; 502 skb_reset_mac_header(skb); 503 skb->protocol = eth_hdr(skb)->h_proto; 504 } 505 506 static unsigned int macsec_msdu_len(struct sk_buff *skb) 507 { 508 struct macsec_dev *macsec = macsec_priv(skb->dev); 509 struct macsec_secy *secy = &macsec->secy; 510 bool sci_present = macsec_skb_cb(skb)->has_sci; 511 512 return skb->len - macsec_hdr_len(sci_present) - secy->icv_len; 513 } 514 515 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, 516 struct macsec_tx_sa *tx_sa) 517 { 518 unsigned int msdu_len = macsec_msdu_len(skb); 519 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); 520 521 u64_stats_update_begin(&txsc_stats->syncp); 522 if (tx_sc->encrypt) { 523 txsc_stats->stats.OutOctetsEncrypted += msdu_len; 524 txsc_stats->stats.OutPktsEncrypted++; 525 this_cpu_inc(tx_sa->stats->OutPktsEncrypted); 526 } else { 527 txsc_stats->stats.OutOctetsProtected += msdu_len; 528 txsc_stats->stats.OutPktsProtected++; 529 this_cpu_inc(tx_sa->stats->OutPktsProtected); 530 } 531 u64_stats_update_end(&txsc_stats->syncp); 532 } 533 534 static void count_tx(struct net_device *dev, int ret, int len) 535 { 536 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) 537 dev_sw_netstats_tx_add(dev, 1, len); 538 } 539 540 static void macsec_encrypt_done(void *data, int err) 541 { 542 struct sk_buff *skb = data; 543 struct net_device *dev = skb->dev; 544 struct macsec_dev *macsec = macsec_priv(dev); 545 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 546 int len, ret; 547 548 aead_request_free(macsec_skb_cb(skb)->req); 549 550 rcu_read_lock_bh(); 551 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 552 /* packet is encrypted/protected so tx_bytes must be calculated */ 553 len = macsec_msdu_len(skb) + 2 * ETH_ALEN; 554 macsec_encrypt_finish(skb, dev); 555 ret = dev_queue_xmit(skb); 556 count_tx(dev, ret, len); 557 rcu_read_unlock_bh(); 558 559 macsec_txsa_put(sa); 560 dev_put(dev); 561 } 562 563 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, 564 unsigned char **iv, 565 struct scatterlist **sg, 566 int num_frags) 567 { 568 size_t size, iv_offset, sg_offset; 569 struct aead_request *req; 570 void *tmp; 571 572 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); 573 iv_offset = size; 574 size += GCM_AES_IV_LEN; 575 576 size = ALIGN(size, __alignof__(struct scatterlist)); 577 sg_offset = size; 578 size += sizeof(struct scatterlist) * num_frags; 579 580 tmp = kmalloc(size, GFP_ATOMIC); 581 if (!tmp) 582 return NULL; 583 584 *iv = (unsigned char *)(tmp + iv_offset); 585 *sg = (struct scatterlist *)(tmp + sg_offset); 586 req = tmp; 587 588 aead_request_set_tfm(req, tfm); 589 590 return req; 591 } 592 593 static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 594 struct net_device *dev) 595 { 596 int ret; 597 struct scatterlist *sg; 598 struct sk_buff *trailer; 599 unsigned char *iv; 600 struct ethhdr *eth; 601 struct macsec_eth_header *hh; 602 size_t unprotected_len; 603 struct aead_request *req; 604 struct macsec_secy *secy; 605 struct macsec_tx_sc *tx_sc; 606 struct macsec_tx_sa *tx_sa; 607 struct macsec_dev *macsec = macsec_priv(dev); 608 bool sci_present; 609 pn_t pn; 610 611 secy = &macsec->secy; 612 tx_sc = &secy->tx_sc; 613 614 /* 10.5.1 TX SA assignment */ 615 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); 616 if (!tx_sa) { 617 secy->operational = false; 618 kfree_skb(skb); 619 return ERR_PTR(-EINVAL); 620 } 621 622 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || 623 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { 624 struct sk_buff *nskb = skb_copy_expand(skb, 625 MACSEC_NEEDED_HEADROOM, 626 MACSEC_NEEDED_TAILROOM, 627 GFP_ATOMIC); 628 if (likely(nskb)) { 629 consume_skb(skb); 630 skb = nskb; 631 } else { 632 macsec_txsa_put(tx_sa); 633 kfree_skb(skb); 634 return ERR_PTR(-ENOMEM); 635 } 636 } else { 637 skb = skb_unshare(skb, GFP_ATOMIC); 638 if (!skb) { 639 macsec_txsa_put(tx_sa); 640 return ERR_PTR(-ENOMEM); 641 } 642 } 643 644 unprotected_len = skb->len; 645 eth = eth_hdr(skb); 646 sci_present = macsec_send_sci(secy); 647 hh = skb_push(skb, macsec_extra_len(sci_present)); 648 memmove(hh, eth, 2 * ETH_ALEN); 649 650 pn = tx_sa_update_pn(tx_sa, secy); 651 if (pn.full64 == 0) { 652 macsec_txsa_put(tx_sa); 653 kfree_skb(skb); 654 return ERR_PTR(-ENOLINK); 655 } 656 macsec_fill_sectag(hh, secy, pn.lower, sci_present); 657 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); 658 659 skb_put(skb, secy->icv_len); 660 661 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { 662 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 663 664 u64_stats_update_begin(&secy_stats->syncp); 665 secy_stats->stats.OutPktsTooLong++; 666 u64_stats_update_end(&secy_stats->syncp); 667 668 macsec_txsa_put(tx_sa); 669 kfree_skb(skb); 670 return ERR_PTR(-EINVAL); 671 } 672 673 ret = skb_cow_data(skb, 0, &trailer); 674 if (unlikely(ret < 0)) { 675 macsec_txsa_put(tx_sa); 676 kfree_skb(skb); 677 return ERR_PTR(ret); 678 } 679 680 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret); 681 if (!req) { 682 macsec_txsa_put(tx_sa); 683 kfree_skb(skb); 684 return ERR_PTR(-ENOMEM); 685 } 686 687 if (secy->xpn) 688 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt); 689 else 690 macsec_fill_iv(iv, secy->sci, pn.lower); 691 692 sg_init_table(sg, ret); 693 ret = skb_to_sgvec(skb, sg, 0, skb->len); 694 if (unlikely(ret < 0)) { 695 aead_request_free(req); 696 macsec_txsa_put(tx_sa); 697 kfree_skb(skb); 698 return ERR_PTR(ret); 699 } 700 701 if (tx_sc->encrypt) { 702 int len = skb->len - macsec_hdr_len(sci_present) - 703 secy->icv_len; 704 aead_request_set_crypt(req, sg, sg, len, iv); 705 aead_request_set_ad(req, macsec_hdr_len(sci_present)); 706 } else { 707 aead_request_set_crypt(req, sg, sg, 0, iv); 708 aead_request_set_ad(req, skb->len - secy->icv_len); 709 } 710 711 macsec_skb_cb(skb)->req = req; 712 macsec_skb_cb(skb)->tx_sa = tx_sa; 713 macsec_skb_cb(skb)->has_sci = sci_present; 714 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 715 716 dev_hold(skb->dev); 717 ret = crypto_aead_encrypt(req); 718 if (ret == -EINPROGRESS) { 719 return ERR_PTR(ret); 720 } else if (ret != 0) { 721 dev_put(skb->dev); 722 kfree_skb(skb); 723 aead_request_free(req); 724 macsec_txsa_put(tx_sa); 725 return ERR_PTR(-EINVAL); 726 } 727 728 dev_put(skb->dev); 729 aead_request_free(req); 730 macsec_txsa_put(tx_sa); 731 732 return skb; 733 } 734 735 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 736 { 737 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 738 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 739 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 740 u32 lowest_pn = 0; 741 742 spin_lock(&rx_sa->lock); 743 if (rx_sa->next_pn_halves.lower >= secy->replay_window) 744 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window; 745 746 /* Now perform replay protection check again 747 * (see IEEE 802.1AE-2006 figure 10-5) 748 */ 749 if (secy->replay_protect && pn < lowest_pn && 750 (!secy->xpn || pn_same_half(pn, lowest_pn))) { 751 spin_unlock(&rx_sa->lock); 752 u64_stats_update_begin(&rxsc_stats->syncp); 753 rxsc_stats->stats.InPktsLate++; 754 u64_stats_update_end(&rxsc_stats->syncp); 755 DEV_STATS_INC(secy->netdev, rx_dropped); 756 return false; 757 } 758 759 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 760 unsigned int msdu_len = macsec_msdu_len(skb); 761 u64_stats_update_begin(&rxsc_stats->syncp); 762 if (hdr->tci_an & MACSEC_TCI_E) 763 rxsc_stats->stats.InOctetsDecrypted += msdu_len; 764 else 765 rxsc_stats->stats.InOctetsValidated += msdu_len; 766 u64_stats_update_end(&rxsc_stats->syncp); 767 } 768 769 if (!macsec_skb_cb(skb)->valid) { 770 spin_unlock(&rx_sa->lock); 771 772 /* 10.6.5 */ 773 if (hdr->tci_an & MACSEC_TCI_C || 774 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 775 u64_stats_update_begin(&rxsc_stats->syncp); 776 rxsc_stats->stats.InPktsNotValid++; 777 u64_stats_update_end(&rxsc_stats->syncp); 778 this_cpu_inc(rx_sa->stats->InPktsNotValid); 779 DEV_STATS_INC(secy->netdev, rx_errors); 780 return false; 781 } 782 783 u64_stats_update_begin(&rxsc_stats->syncp); 784 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 785 rxsc_stats->stats.InPktsInvalid++; 786 this_cpu_inc(rx_sa->stats->InPktsInvalid); 787 } else if (pn < lowest_pn) { 788 rxsc_stats->stats.InPktsDelayed++; 789 } else { 790 rxsc_stats->stats.InPktsUnchecked++; 791 } 792 u64_stats_update_end(&rxsc_stats->syncp); 793 } else { 794 u64_stats_update_begin(&rxsc_stats->syncp); 795 if (pn < lowest_pn) { 796 rxsc_stats->stats.InPktsDelayed++; 797 } else { 798 rxsc_stats->stats.InPktsOK++; 799 this_cpu_inc(rx_sa->stats->InPktsOK); 800 } 801 u64_stats_update_end(&rxsc_stats->syncp); 802 803 // Instead of "pn >=" - to support pn overflow in xpn 804 if (pn + 1 > rx_sa->next_pn_halves.lower) { 805 rx_sa->next_pn_halves.lower = pn + 1; 806 } else if (secy->xpn && 807 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) { 808 rx_sa->next_pn_halves.upper++; 809 rx_sa->next_pn_halves.lower = pn + 1; 810 } 811 812 spin_unlock(&rx_sa->lock); 813 } 814 815 return true; 816 } 817 818 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 819 { 820 skb->pkt_type = PACKET_HOST; 821 skb->protocol = eth_type_trans(skb, dev); 822 823 skb_reset_network_header(skb); 824 if (!skb_transport_header_was_set(skb)) 825 skb_reset_transport_header(skb); 826 skb_reset_mac_len(skb); 827 } 828 829 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 830 { 831 skb->ip_summed = CHECKSUM_NONE; 832 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 833 skb_pull(skb, hdr_len); 834 pskb_trim_unique(skb, skb->len - icv_len); 835 } 836 837 static void count_rx(struct net_device *dev, int len) 838 { 839 dev_sw_netstats_rx_add(dev, len); 840 } 841 842 static void macsec_decrypt_done(void *data, int err) 843 { 844 struct sk_buff *skb = data; 845 struct net_device *dev = skb->dev; 846 struct macsec_dev *macsec = macsec_priv(dev); 847 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 848 struct macsec_rx_sc *rx_sc = rx_sa->sc; 849 int len; 850 u32 pn; 851 852 aead_request_free(macsec_skb_cb(skb)->req); 853 854 if (!err) 855 macsec_skb_cb(skb)->valid = true; 856 857 rcu_read_lock_bh(); 858 pn = ntohl(macsec_ethhdr(skb)->packet_number); 859 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 860 rcu_read_unlock_bh(); 861 kfree_skb(skb); 862 goto out; 863 } 864 865 macsec_finalize_skb(skb, macsec->secy.icv_len, 866 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 867 len = skb->len; 868 macsec_reset_skb(skb, macsec->secy.netdev); 869 870 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS) 871 count_rx(dev, len); 872 873 rcu_read_unlock_bh(); 874 875 out: 876 macsec_rxsa_put(rx_sa); 877 macsec_rxsc_put(rx_sc); 878 dev_put(dev); 879 } 880 881 static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 882 struct net_device *dev, 883 struct macsec_rx_sa *rx_sa, 884 sci_t sci, 885 struct macsec_secy *secy) 886 { 887 int ret; 888 struct scatterlist *sg; 889 struct sk_buff *trailer; 890 unsigned char *iv; 891 struct aead_request *req; 892 struct macsec_eth_header *hdr; 893 u32 hdr_pn; 894 u16 icv_len = secy->icv_len; 895 896 macsec_skb_cb(skb)->valid = false; 897 skb = skb_share_check(skb, GFP_ATOMIC); 898 if (!skb) 899 return ERR_PTR(-ENOMEM); 900 901 ret = skb_cow_data(skb, 0, &trailer); 902 if (unlikely(ret < 0)) { 903 kfree_skb(skb); 904 return ERR_PTR(ret); 905 } 906 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret); 907 if (!req) { 908 kfree_skb(skb); 909 return ERR_PTR(-ENOMEM); 910 } 911 912 hdr = (struct macsec_eth_header *)skb->data; 913 hdr_pn = ntohl(hdr->packet_number); 914 915 if (secy->xpn) { 916 pn_t recovered_pn = rx_sa->next_pn_halves; 917 918 recovered_pn.lower = hdr_pn; 919 if (hdr_pn < rx_sa->next_pn_halves.lower && 920 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower)) 921 recovered_pn.upper++; 922 923 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64, 924 rx_sa->key.salt); 925 } else { 926 macsec_fill_iv(iv, sci, hdr_pn); 927 } 928 929 sg_init_table(sg, ret); 930 ret = skb_to_sgvec(skb, sg, 0, skb->len); 931 if (unlikely(ret < 0)) { 932 aead_request_free(req); 933 kfree_skb(skb); 934 return ERR_PTR(ret); 935 } 936 937 if (hdr->tci_an & MACSEC_TCI_E) { 938 /* confidentiality: ethernet + macsec header 939 * authenticated, encrypted payload 940 */ 941 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 942 943 aead_request_set_crypt(req, sg, sg, len, iv); 944 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 945 skb = skb_unshare(skb, GFP_ATOMIC); 946 if (!skb) { 947 aead_request_free(req); 948 return ERR_PTR(-ENOMEM); 949 } 950 } else { 951 /* integrity only: all headers + data authenticated */ 952 aead_request_set_crypt(req, sg, sg, icv_len, iv); 953 aead_request_set_ad(req, skb->len - icv_len); 954 } 955 956 macsec_skb_cb(skb)->req = req; 957 skb->dev = dev; 958 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 959 960 dev_hold(dev); 961 ret = crypto_aead_decrypt(req); 962 if (ret == -EINPROGRESS) { 963 return ERR_PTR(ret); 964 } else if (ret != 0) { 965 /* decryption/authentication failed 966 * 10.6 if validateFrames is disabled, deliver anyway 967 */ 968 if (ret != -EBADMSG) { 969 kfree_skb(skb); 970 skb = ERR_PTR(ret); 971 } 972 } else { 973 macsec_skb_cb(skb)->valid = true; 974 } 975 dev_put(dev); 976 977 aead_request_free(req); 978 979 return skb; 980 } 981 982 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 983 { 984 struct macsec_rx_sc *rx_sc; 985 986 for_each_rxsc(secy, rx_sc) { 987 if (rx_sc->sci == sci) 988 return rx_sc; 989 } 990 991 return NULL; 992 } 993 994 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 995 { 996 struct macsec_rx_sc *rx_sc; 997 998 for_each_rxsc_rtnl(secy, rx_sc) { 999 if (rx_sc->sci == sci) 1000 return rx_sc; 1001 } 1002 1003 return NULL; 1004 } 1005 1006 static enum rx_handler_result handle_not_macsec(struct sk_buff *skb) 1007 { 1008 /* Deliver to the uncontrolled port by default */ 1009 enum rx_handler_result ret = RX_HANDLER_PASS; 1010 struct ethhdr *hdr = eth_hdr(skb); 1011 struct metadata_dst *md_dst; 1012 struct macsec_rxh_data *rxd; 1013 struct macsec_dev *macsec; 1014 bool is_macsec_md_dst; 1015 1016 rcu_read_lock(); 1017 rxd = macsec_data_rcu(skb->dev); 1018 md_dst = skb_metadata_dst(skb); 1019 is_macsec_md_dst = md_dst && md_dst->type == METADATA_MACSEC; 1020 1021 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1022 struct sk_buff *nskb; 1023 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 1024 struct net_device *ndev = macsec->secy.netdev; 1025 1026 /* If h/w offloading is enabled, HW decodes frames and strips 1027 * the SecTAG, so we have to deduce which port to deliver to. 1028 */ 1029 if (macsec_is_offloaded(macsec) && netif_running(ndev)) { 1030 const struct macsec_ops *ops; 1031 1032 ops = macsec_get_ops(macsec, NULL); 1033 1034 if (ops->rx_uses_md_dst && !is_macsec_md_dst) 1035 continue; 1036 1037 if (is_macsec_md_dst) { 1038 struct macsec_rx_sc *rx_sc; 1039 1040 /* All drivers that implement MACsec offload 1041 * support using skb metadata destinations must 1042 * indicate that they do so. 1043 */ 1044 DEBUG_NET_WARN_ON_ONCE(!ops->rx_uses_md_dst); 1045 rx_sc = find_rx_sc(&macsec->secy, 1046 md_dst->u.macsec_info.sci); 1047 if (!rx_sc) 1048 continue; 1049 /* device indicated macsec offload occurred */ 1050 skb->dev = ndev; 1051 skb->pkt_type = PACKET_HOST; 1052 eth_skb_pkt_type(skb, ndev); 1053 ret = RX_HANDLER_ANOTHER; 1054 goto out; 1055 } 1056 1057 /* This datapath is insecure because it is unable to 1058 * enforce isolation of broadcast/multicast traffic and 1059 * unicast traffic with promiscuous mode on the macsec 1060 * netdev. Since the core stack has no mechanism to 1061 * check that the hardware did indeed receive MACsec 1062 * traffic, it is possible that the response handling 1063 * done by the MACsec port was to a plaintext packet. 1064 * This violates the MACsec protocol standard. 1065 */ 1066 if (ether_addr_equal_64bits(hdr->h_dest, 1067 ndev->dev_addr)) { 1068 /* exact match, divert skb to this port */ 1069 skb->dev = ndev; 1070 skb->pkt_type = PACKET_HOST; 1071 ret = RX_HANDLER_ANOTHER; 1072 goto out; 1073 } else if (is_multicast_ether_addr_64bits( 1074 hdr->h_dest)) { 1075 /* multicast frame, deliver on this port too */ 1076 nskb = skb_clone(skb, GFP_ATOMIC); 1077 if (!nskb) 1078 break; 1079 1080 nskb->dev = ndev; 1081 eth_skb_pkt_type(nskb, ndev); 1082 1083 __netif_rx(nskb); 1084 } else if (ndev->flags & IFF_PROMISC) { 1085 skb->dev = ndev; 1086 skb->pkt_type = PACKET_HOST; 1087 ret = RX_HANDLER_ANOTHER; 1088 goto out; 1089 } 1090 1091 continue; 1092 } 1093 1094 /* 10.6 If the management control validateFrames is not 1095 * Strict, frames without a SecTAG are received, counted, and 1096 * delivered to the Controlled Port 1097 */ 1098 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1099 u64_stats_update_begin(&secy_stats->syncp); 1100 secy_stats->stats.InPktsNoTag++; 1101 u64_stats_update_end(&secy_stats->syncp); 1102 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1103 continue; 1104 } 1105 1106 /* deliver on this port */ 1107 nskb = skb_clone(skb, GFP_ATOMIC); 1108 if (!nskb) 1109 break; 1110 1111 nskb->dev = ndev; 1112 1113 if (__netif_rx(nskb) == NET_RX_SUCCESS) { 1114 u64_stats_update_begin(&secy_stats->syncp); 1115 secy_stats->stats.InPktsUntagged++; 1116 u64_stats_update_end(&secy_stats->syncp); 1117 } 1118 } 1119 1120 out: 1121 rcu_read_unlock(); 1122 return ret; 1123 } 1124 1125 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 1126 { 1127 struct sk_buff *skb = *pskb; 1128 struct net_device *dev = skb->dev; 1129 struct macsec_eth_header *hdr; 1130 struct macsec_secy *secy = NULL; 1131 struct macsec_rx_sc *rx_sc; 1132 struct macsec_rx_sa *rx_sa; 1133 struct macsec_rxh_data *rxd; 1134 struct macsec_dev *macsec; 1135 unsigned int len; 1136 sci_t sci = 0; 1137 u32 hdr_pn; 1138 bool cbit; 1139 struct pcpu_rx_sc_stats *rxsc_stats; 1140 struct pcpu_secy_stats *secy_stats; 1141 bool pulled_sci; 1142 int ret; 1143 1144 if (skb_headroom(skb) < ETH_HLEN) 1145 goto drop_direct; 1146 1147 hdr = macsec_ethhdr(skb); 1148 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) 1149 return handle_not_macsec(skb); 1150 1151 skb = skb_unshare(skb, GFP_ATOMIC); 1152 *pskb = skb; 1153 if (!skb) 1154 return RX_HANDLER_CONSUMED; 1155 1156 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1157 if (!pulled_sci) { 1158 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1159 goto drop_direct; 1160 } 1161 1162 hdr = macsec_ethhdr(skb); 1163 1164 /* Frames with a SecTAG that has the TCI E bit set but the C 1165 * bit clear are discarded, as this reserved encoding is used 1166 * to identify frames with a SecTAG that are not to be 1167 * delivered to the Controlled Port. 1168 */ 1169 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1170 return RX_HANDLER_PASS; 1171 1172 /* now, pull the extra length */ 1173 if (hdr->tci_an & MACSEC_TCI_SC) { 1174 if (!pulled_sci) 1175 goto drop_direct; 1176 } 1177 1178 /* ethernet header is part of crypto processing */ 1179 skb_push(skb, ETH_HLEN); 1180 1181 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1182 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1183 1184 rcu_read_lock(); 1185 rxd = macsec_data_rcu(skb->dev); 1186 1187 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci, rxd); 1188 if (!sci) 1189 goto drop_nosc; 1190 1191 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1192 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1193 1194 sc = sc ? macsec_rxsc_get(sc) : NULL; 1195 1196 if (sc) { 1197 secy = &macsec->secy; 1198 rx_sc = sc; 1199 break; 1200 } 1201 } 1202 1203 if (!secy) 1204 goto nosci; 1205 1206 dev = secy->netdev; 1207 macsec = macsec_priv(dev); 1208 secy_stats = this_cpu_ptr(macsec->stats); 1209 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1210 1211 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) { 1212 u64_stats_update_begin(&secy_stats->syncp); 1213 secy_stats->stats.InPktsBadTag++; 1214 u64_stats_update_end(&secy_stats->syncp); 1215 DEV_STATS_INC(secy->netdev, rx_errors); 1216 goto drop_nosa; 1217 } 1218 1219 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1220 if (!rx_sa) { 1221 /* 10.6.1 if the SA is not in use */ 1222 1223 /* If validateFrames is Strict or the C bit in the 1224 * SecTAG is set, discard 1225 */ 1226 if (hdr->tci_an & MACSEC_TCI_C || 1227 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1228 u64_stats_update_begin(&rxsc_stats->syncp); 1229 rxsc_stats->stats.InPktsNotUsingSA++; 1230 u64_stats_update_end(&rxsc_stats->syncp); 1231 DEV_STATS_INC(secy->netdev, rx_errors); 1232 goto drop_nosa; 1233 } 1234 1235 /* not Strict, the frame (with the SecTAG and ICV 1236 * removed) is delivered to the Controlled Port. 1237 */ 1238 u64_stats_update_begin(&rxsc_stats->syncp); 1239 rxsc_stats->stats.InPktsUnusedSA++; 1240 u64_stats_update_end(&rxsc_stats->syncp); 1241 goto deliver; 1242 } 1243 1244 /* First, PN check to avoid decrypting obviously wrong packets */ 1245 hdr_pn = ntohl(hdr->packet_number); 1246 if (secy->replay_protect) { 1247 bool late; 1248 1249 spin_lock(&rx_sa->lock); 1250 late = rx_sa->next_pn_halves.lower >= secy->replay_window && 1251 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window); 1252 1253 if (secy->xpn) 1254 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn); 1255 spin_unlock(&rx_sa->lock); 1256 1257 if (late) { 1258 u64_stats_update_begin(&rxsc_stats->syncp); 1259 rxsc_stats->stats.InPktsLate++; 1260 u64_stats_update_end(&rxsc_stats->syncp); 1261 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1262 goto drop; 1263 } 1264 } 1265 1266 macsec_skb_cb(skb)->rx_sa = rx_sa; 1267 1268 /* Disabled && !changed text => skip validation */ 1269 if (hdr->tci_an & MACSEC_TCI_C || 1270 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1271 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1272 1273 if (IS_ERR(skb)) { 1274 /* the decrypt callback needs the reference */ 1275 if (PTR_ERR(skb) != -EINPROGRESS) { 1276 macsec_rxsa_put(rx_sa); 1277 macsec_rxsc_put(rx_sc); 1278 } 1279 rcu_read_unlock(); 1280 *pskb = NULL; 1281 return RX_HANDLER_CONSUMED; 1282 } 1283 1284 if (!macsec_post_decrypt(skb, secy, hdr_pn)) 1285 goto drop; 1286 1287 deliver: 1288 macsec_finalize_skb(skb, secy->icv_len, 1289 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1290 len = skb->len; 1291 macsec_reset_skb(skb, secy->netdev); 1292 1293 if (rx_sa) 1294 macsec_rxsa_put(rx_sa); 1295 macsec_rxsc_put(rx_sc); 1296 1297 skb_orphan(skb); 1298 ret = gro_cells_receive(&macsec->gro_cells, skb); 1299 if (ret == NET_RX_SUCCESS) 1300 count_rx(dev, len); 1301 else 1302 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1303 1304 rcu_read_unlock(); 1305 1306 *pskb = NULL; 1307 return RX_HANDLER_CONSUMED; 1308 1309 drop: 1310 macsec_rxsa_put(rx_sa); 1311 drop_nosa: 1312 macsec_rxsc_put(rx_sc); 1313 drop_nosc: 1314 rcu_read_unlock(); 1315 drop_direct: 1316 kfree_skb(skb); 1317 *pskb = NULL; 1318 return RX_HANDLER_CONSUMED; 1319 1320 nosci: 1321 /* 10.6.1 if the SC is not found */ 1322 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1323 if (!cbit) 1324 macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN, 1325 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1326 1327 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1328 struct sk_buff *nskb; 1329 1330 secy_stats = this_cpu_ptr(macsec->stats); 1331 1332 /* If validateFrames is Strict or the C bit in the 1333 * SecTAG is set, discard 1334 */ 1335 if (cbit || 1336 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1337 u64_stats_update_begin(&secy_stats->syncp); 1338 secy_stats->stats.InPktsNoSCI++; 1339 u64_stats_update_end(&secy_stats->syncp); 1340 DEV_STATS_INC(macsec->secy.netdev, rx_errors); 1341 continue; 1342 } 1343 1344 /* not strict, the frame (with the SecTAG and ICV 1345 * removed) is delivered to the Controlled Port. 1346 */ 1347 nskb = skb_clone(skb, GFP_ATOMIC); 1348 if (!nskb) 1349 break; 1350 1351 macsec_reset_skb(nskb, macsec->secy.netdev); 1352 1353 ret = __netif_rx(nskb); 1354 if (ret == NET_RX_SUCCESS) { 1355 u64_stats_update_begin(&secy_stats->syncp); 1356 secy_stats->stats.InPktsUnknownSCI++; 1357 u64_stats_update_end(&secy_stats->syncp); 1358 } else { 1359 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1360 } 1361 } 1362 1363 rcu_read_unlock(); 1364 *pskb = skb; 1365 return RX_HANDLER_PASS; 1366 } 1367 1368 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1369 { 1370 struct crypto_aead *tfm; 1371 int ret; 1372 1373 tfm = crypto_alloc_aead("gcm(aes)", 0, 0); 1374 1375 if (IS_ERR(tfm)) 1376 return tfm; 1377 1378 ret = crypto_aead_setkey(tfm, key, key_len); 1379 if (ret < 0) 1380 goto fail; 1381 1382 ret = crypto_aead_setauthsize(tfm, icv_len); 1383 if (ret < 0) 1384 goto fail; 1385 1386 return tfm; 1387 fail: 1388 crypto_free_aead(tfm); 1389 return ERR_PTR(ret); 1390 } 1391 1392 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1393 int icv_len) 1394 { 1395 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1396 if (!rx_sa->stats) 1397 return -ENOMEM; 1398 1399 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1400 if (IS_ERR(rx_sa->key.tfm)) { 1401 free_percpu(rx_sa->stats); 1402 return PTR_ERR(rx_sa->key.tfm); 1403 } 1404 1405 rx_sa->ssci = MACSEC_UNDEF_SSCI; 1406 rx_sa->active = false; 1407 rx_sa->next_pn = 1; 1408 refcount_set(&rx_sa->refcnt, 1); 1409 spin_lock_init(&rx_sa->lock); 1410 1411 return 0; 1412 } 1413 1414 static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1415 { 1416 rx_sa->active = false; 1417 1418 macsec_rxsa_put(rx_sa); 1419 } 1420 1421 static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1422 { 1423 int i; 1424 1425 for (i = 0; i < MACSEC_NUM_AN; i++) { 1426 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1427 1428 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1429 if (sa) 1430 clear_rx_sa(sa); 1431 } 1432 1433 macsec_rxsc_put(rx_sc); 1434 } 1435 1436 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1437 { 1438 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1439 1440 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1441 rx_sc; 1442 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1443 if (rx_sc->sci == sci) { 1444 if (rx_sc->active) 1445 secy->n_rx_sc--; 1446 rcu_assign_pointer(*rx_scp, rx_sc->next); 1447 return rx_sc; 1448 } 1449 } 1450 1451 return NULL; 1452 } 1453 1454 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci, 1455 bool active) 1456 { 1457 struct macsec_rx_sc *rx_sc; 1458 struct macsec_dev *macsec; 1459 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1460 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1461 struct macsec_secy *secy; 1462 1463 list_for_each_entry(macsec, &rxd->secys, secys) { 1464 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1465 return ERR_PTR(-EEXIST); 1466 } 1467 1468 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL); 1469 if (!rx_sc) 1470 return ERR_PTR(-ENOMEM); 1471 1472 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1473 if (!rx_sc->stats) { 1474 kfree(rx_sc); 1475 return ERR_PTR(-ENOMEM); 1476 } 1477 1478 rx_sc->sci = sci; 1479 rx_sc->active = active; 1480 refcount_set(&rx_sc->refcnt, 1); 1481 1482 secy = &macsec_priv(dev)->secy; 1483 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1484 rcu_assign_pointer(secy->rx_sc, rx_sc); 1485 1486 if (rx_sc->active) 1487 secy->n_rx_sc++; 1488 1489 return rx_sc; 1490 } 1491 1492 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1493 int icv_len) 1494 { 1495 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1496 if (!tx_sa->stats) 1497 return -ENOMEM; 1498 1499 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1500 if (IS_ERR(tx_sa->key.tfm)) { 1501 free_percpu(tx_sa->stats); 1502 return PTR_ERR(tx_sa->key.tfm); 1503 } 1504 1505 tx_sa->ssci = MACSEC_UNDEF_SSCI; 1506 tx_sa->active = false; 1507 refcount_set(&tx_sa->refcnt, 1); 1508 spin_lock_init(&tx_sa->lock); 1509 1510 return 0; 1511 } 1512 1513 static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1514 { 1515 tx_sa->active = false; 1516 1517 macsec_txsa_put(tx_sa); 1518 } 1519 1520 static struct genl_family macsec_fam; 1521 1522 static struct net_device *get_dev_from_nl(struct net *net, 1523 struct nlattr **attrs) 1524 { 1525 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1526 struct net_device *dev; 1527 1528 dev = __dev_get_by_index(net, ifindex); 1529 if (!dev) 1530 return ERR_PTR(-ENODEV); 1531 1532 if (!netif_is_macsec(dev)) 1533 return ERR_PTR(-ENODEV); 1534 1535 return dev; 1536 } 1537 1538 static enum macsec_offload nla_get_offload(const struct nlattr *nla) 1539 { 1540 return (__force enum macsec_offload)nla_get_u8(nla); 1541 } 1542 1543 static sci_t nla_get_sci(const struct nlattr *nla) 1544 { 1545 return (__force sci_t)nla_get_u64(nla); 1546 } 1547 1548 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, 1549 int padattr) 1550 { 1551 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); 1552 } 1553 1554 static ssci_t nla_get_ssci(const struct nlattr *nla) 1555 { 1556 return (__force ssci_t)nla_get_u32(nla); 1557 } 1558 1559 static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value) 1560 { 1561 return nla_put_u32(skb, attrtype, (__force u64)value); 1562 } 1563 1564 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1565 struct nlattr **attrs, 1566 struct nlattr **tb_sa, 1567 struct net_device **devp, 1568 struct macsec_secy **secyp, 1569 struct macsec_tx_sc **scp, 1570 u8 *assoc_num) 1571 { 1572 struct net_device *dev; 1573 struct macsec_secy *secy; 1574 struct macsec_tx_sc *tx_sc; 1575 struct macsec_tx_sa *tx_sa; 1576 1577 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1578 return ERR_PTR(-EINVAL); 1579 1580 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1581 1582 dev = get_dev_from_nl(net, attrs); 1583 if (IS_ERR(dev)) 1584 return ERR_CAST(dev); 1585 1586 secy = &macsec_priv(dev)->secy; 1587 tx_sc = &secy->tx_sc; 1588 1589 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1590 if (!tx_sa) 1591 return ERR_PTR(-ENODEV); 1592 1593 *devp = dev; 1594 *scp = tx_sc; 1595 *secyp = secy; 1596 return tx_sa; 1597 } 1598 1599 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1600 struct nlattr **attrs, 1601 struct nlattr **tb_rxsc, 1602 struct net_device **devp, 1603 struct macsec_secy **secyp) 1604 { 1605 struct net_device *dev; 1606 struct macsec_secy *secy; 1607 struct macsec_rx_sc *rx_sc; 1608 sci_t sci; 1609 1610 dev = get_dev_from_nl(net, attrs); 1611 if (IS_ERR(dev)) 1612 return ERR_CAST(dev); 1613 1614 secy = &macsec_priv(dev)->secy; 1615 1616 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1617 return ERR_PTR(-EINVAL); 1618 1619 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1620 rx_sc = find_rx_sc_rtnl(secy, sci); 1621 if (!rx_sc) 1622 return ERR_PTR(-ENODEV); 1623 1624 *secyp = secy; 1625 *devp = dev; 1626 1627 return rx_sc; 1628 } 1629 1630 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1631 struct nlattr **attrs, 1632 struct nlattr **tb_rxsc, 1633 struct nlattr **tb_sa, 1634 struct net_device **devp, 1635 struct macsec_secy **secyp, 1636 struct macsec_rx_sc **scp, 1637 u8 *assoc_num) 1638 { 1639 struct macsec_rx_sc *rx_sc; 1640 struct macsec_rx_sa *rx_sa; 1641 1642 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1643 return ERR_PTR(-EINVAL); 1644 1645 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1646 1647 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1648 if (IS_ERR(rx_sc)) 1649 return ERR_CAST(rx_sc); 1650 1651 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1652 if (!rx_sa) 1653 return ERR_PTR(-ENODEV); 1654 1655 *scp = rx_sc; 1656 return rx_sa; 1657 } 1658 1659 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1660 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1661 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1662 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1663 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED }, 1664 }; 1665 1666 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1667 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1668 [MACSEC_RXSC_ATTR_ACTIVE] = NLA_POLICY_MAX(NLA_U8, 1), 1669 }; 1670 1671 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1672 [MACSEC_SA_ATTR_AN] = NLA_POLICY_MAX(NLA_U8, MACSEC_NUM_AN - 1), 1673 [MACSEC_SA_ATTR_ACTIVE] = NLA_POLICY_MAX(NLA_U8, 1), 1674 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN(NLA_UINT, 1), 1675 [MACSEC_SA_ATTR_KEYID] = NLA_POLICY_EXACT_LEN(MACSEC_KEYID_LEN), 1676 [MACSEC_SA_ATTR_KEY] = NLA_POLICY_MAX_LEN(MACSEC_MAX_KEY_LEN), 1677 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 }, 1678 [MACSEC_SA_ATTR_SALT] = NLA_POLICY_EXACT_LEN(MACSEC_SALT_LEN), 1679 }; 1680 1681 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = { 1682 [MACSEC_OFFLOAD_ATTR_TYPE] = NLA_POLICY_MAX(NLA_U8, MACSEC_OFFLOAD_MAX), 1683 }; 1684 1685 /* Offloads an operation to a device driver */ 1686 static int macsec_offload(int (* const func)(struct macsec_context *), 1687 struct macsec_context *ctx) 1688 { 1689 int ret; 1690 1691 if (unlikely(!func)) 1692 return 0; 1693 1694 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1695 mutex_lock(&ctx->phydev->lock); 1696 1697 ret = (*func)(ctx); 1698 1699 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1700 mutex_unlock(&ctx->phydev->lock); 1701 1702 return ret; 1703 } 1704 1705 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1706 { 1707 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1708 return -EINVAL; 1709 1710 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL)) 1711 return -EINVAL; 1712 1713 return 0; 1714 } 1715 1716 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1717 { 1718 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1719 return -EINVAL; 1720 1721 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL)) 1722 return -EINVAL; 1723 1724 return 0; 1725 } 1726 1727 static bool validate_add_rxsa(struct nlattr **attrs) 1728 { 1729 if (!attrs[MACSEC_SA_ATTR_AN] || 1730 !attrs[MACSEC_SA_ATTR_KEY] || 1731 !attrs[MACSEC_SA_ATTR_KEYID]) 1732 return false; 1733 1734 return true; 1735 } 1736 1737 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1738 { 1739 struct net_device *dev; 1740 struct nlattr **attrs = info->attrs; 1741 struct macsec_secy *secy; 1742 struct macsec_rx_sc *rx_sc; 1743 struct macsec_rx_sa *rx_sa; 1744 unsigned char assoc_num; 1745 int pn_len; 1746 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1747 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1748 int err; 1749 1750 if (!attrs[MACSEC_ATTR_IFINDEX]) 1751 return -EINVAL; 1752 1753 if (parse_sa_config(attrs, tb_sa)) 1754 return -EINVAL; 1755 1756 if (parse_rxsc_config(attrs, tb_rxsc)) 1757 return -EINVAL; 1758 1759 if (!validate_add_rxsa(tb_sa)) 1760 return -EINVAL; 1761 1762 rtnl_lock(); 1763 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1764 if (IS_ERR(rx_sc)) { 1765 rtnl_unlock(); 1766 return PTR_ERR(rx_sc); 1767 } 1768 1769 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1770 1771 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1772 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1773 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1774 rtnl_unlock(); 1775 return -EINVAL; 1776 } 1777 1778 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1779 if (tb_sa[MACSEC_SA_ATTR_PN] && 1780 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1781 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n", 1782 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1783 rtnl_unlock(); 1784 return -EINVAL; 1785 } 1786 1787 if (secy->xpn) { 1788 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 1789 rtnl_unlock(); 1790 return -EINVAL; 1791 } 1792 } 1793 1794 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1795 if (rx_sa) { 1796 rtnl_unlock(); 1797 return -EBUSY; 1798 } 1799 1800 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1801 if (!rx_sa) { 1802 rtnl_unlock(); 1803 return -ENOMEM; 1804 } 1805 1806 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1807 secy->key_len, secy->icv_len); 1808 if (err < 0) { 1809 kfree(rx_sa); 1810 rtnl_unlock(); 1811 return err; 1812 } 1813 1814 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1815 spin_lock_bh(&rx_sa->lock); 1816 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 1817 spin_unlock_bh(&rx_sa->lock); 1818 } 1819 1820 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1821 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1822 1823 rx_sa->sc = rx_sc; 1824 1825 if (secy->xpn) { 1826 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 1827 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 1828 MACSEC_SALT_LEN); 1829 } 1830 1831 /* If h/w offloading is available, propagate to the device */ 1832 if (macsec_is_offloaded(netdev_priv(dev))) { 1833 const struct macsec_ops *ops; 1834 struct macsec_context ctx; 1835 1836 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1837 if (!ops) { 1838 err = -EOPNOTSUPP; 1839 goto cleanup; 1840 } 1841 1842 ctx.sa.assoc_num = assoc_num; 1843 ctx.sa.rx_sa = rx_sa; 1844 ctx.secy = secy; 1845 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1846 secy->key_len); 1847 1848 err = macsec_offload(ops->mdo_add_rxsa, &ctx); 1849 memzero_explicit(ctx.sa.key, secy->key_len); 1850 if (err) 1851 goto cleanup; 1852 } 1853 1854 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1855 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1856 1857 rtnl_unlock(); 1858 1859 return 0; 1860 1861 cleanup: 1862 macsec_rxsa_put(rx_sa); 1863 rtnl_unlock(); 1864 return err; 1865 } 1866 1867 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1868 { 1869 struct net_device *dev; 1870 sci_t sci = MACSEC_UNDEF_SCI; 1871 struct nlattr **attrs = info->attrs; 1872 struct macsec_rx_sc *rx_sc; 1873 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1874 struct macsec_secy *secy; 1875 bool active = true; 1876 int ret; 1877 1878 if (!attrs[MACSEC_ATTR_IFINDEX]) 1879 return -EINVAL; 1880 1881 if (parse_rxsc_config(attrs, tb_rxsc)) 1882 return -EINVAL; 1883 1884 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1885 return -EINVAL; 1886 1887 rtnl_lock(); 1888 dev = get_dev_from_nl(genl_info_net(info), attrs); 1889 if (IS_ERR(dev)) { 1890 rtnl_unlock(); 1891 return PTR_ERR(dev); 1892 } 1893 1894 secy = &macsec_priv(dev)->secy; 1895 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1896 1897 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1898 active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1899 1900 rx_sc = create_rx_sc(dev, sci, active); 1901 if (IS_ERR(rx_sc)) { 1902 rtnl_unlock(); 1903 return PTR_ERR(rx_sc); 1904 } 1905 1906 if (macsec_is_offloaded(netdev_priv(dev))) { 1907 const struct macsec_ops *ops; 1908 struct macsec_context ctx; 1909 1910 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1911 if (!ops) { 1912 ret = -EOPNOTSUPP; 1913 goto cleanup; 1914 } 1915 1916 ctx.rx_sc = rx_sc; 1917 ctx.secy = secy; 1918 1919 ret = macsec_offload(ops->mdo_add_rxsc, &ctx); 1920 if (ret) 1921 goto cleanup; 1922 } 1923 1924 rtnl_unlock(); 1925 1926 return 0; 1927 1928 cleanup: 1929 del_rx_sc(secy, sci); 1930 free_rx_sc(rx_sc); 1931 rtnl_unlock(); 1932 return ret; 1933 } 1934 1935 static bool validate_add_txsa(struct nlattr **attrs) 1936 { 1937 if (!attrs[MACSEC_SA_ATTR_AN] || 1938 !attrs[MACSEC_SA_ATTR_PN] || 1939 !attrs[MACSEC_SA_ATTR_KEY] || 1940 !attrs[MACSEC_SA_ATTR_KEYID]) 1941 return false; 1942 1943 return true; 1944 } 1945 1946 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1947 { 1948 struct net_device *dev; 1949 struct nlattr **attrs = info->attrs; 1950 struct macsec_secy *secy; 1951 struct macsec_tx_sc *tx_sc; 1952 struct macsec_tx_sa *tx_sa; 1953 unsigned char assoc_num; 1954 int pn_len; 1955 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1956 bool was_operational; 1957 int err; 1958 1959 if (!attrs[MACSEC_ATTR_IFINDEX]) 1960 return -EINVAL; 1961 1962 if (parse_sa_config(attrs, tb_sa)) 1963 return -EINVAL; 1964 1965 if (!validate_add_txsa(tb_sa)) 1966 return -EINVAL; 1967 1968 rtnl_lock(); 1969 dev = get_dev_from_nl(genl_info_net(info), attrs); 1970 if (IS_ERR(dev)) { 1971 rtnl_unlock(); 1972 return PTR_ERR(dev); 1973 } 1974 1975 secy = &macsec_priv(dev)->secy; 1976 tx_sc = &secy->tx_sc; 1977 1978 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1979 1980 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1981 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 1982 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1983 rtnl_unlock(); 1984 return -EINVAL; 1985 } 1986 1987 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1988 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1989 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n", 1990 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1991 rtnl_unlock(); 1992 return -EINVAL; 1993 } 1994 1995 if (secy->xpn) { 1996 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 1997 rtnl_unlock(); 1998 return -EINVAL; 1999 } 2000 } 2001 2002 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 2003 if (tx_sa) { 2004 rtnl_unlock(); 2005 return -EBUSY; 2006 } 2007 2008 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 2009 if (!tx_sa) { 2010 rtnl_unlock(); 2011 return -ENOMEM; 2012 } 2013 2014 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2015 secy->key_len, secy->icv_len); 2016 if (err < 0) { 2017 kfree(tx_sa); 2018 rtnl_unlock(); 2019 return err; 2020 } 2021 2022 spin_lock_bh(&tx_sa->lock); 2023 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2024 spin_unlock_bh(&tx_sa->lock); 2025 2026 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2027 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2028 2029 was_operational = secy->operational; 2030 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 2031 secy->operational = true; 2032 2033 if (secy->xpn) { 2034 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 2035 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 2036 MACSEC_SALT_LEN); 2037 } 2038 2039 /* If h/w offloading is available, propagate to the device */ 2040 if (macsec_is_offloaded(netdev_priv(dev))) { 2041 const struct macsec_ops *ops; 2042 struct macsec_context ctx; 2043 2044 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2045 if (!ops) { 2046 err = -EOPNOTSUPP; 2047 goto cleanup; 2048 } 2049 2050 ctx.sa.assoc_num = assoc_num; 2051 ctx.sa.tx_sa = tx_sa; 2052 ctx.secy = secy; 2053 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2054 secy->key_len); 2055 2056 err = macsec_offload(ops->mdo_add_txsa, &ctx); 2057 memzero_explicit(ctx.sa.key, secy->key_len); 2058 if (err) 2059 goto cleanup; 2060 } 2061 2062 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 2063 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 2064 2065 rtnl_unlock(); 2066 2067 return 0; 2068 2069 cleanup: 2070 secy->operational = was_operational; 2071 macsec_txsa_put(tx_sa); 2072 rtnl_unlock(); 2073 return err; 2074 } 2075 2076 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 2077 { 2078 struct nlattr **attrs = info->attrs; 2079 struct net_device *dev; 2080 struct macsec_secy *secy; 2081 struct macsec_rx_sc *rx_sc; 2082 struct macsec_rx_sa *rx_sa; 2083 u8 assoc_num; 2084 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2085 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2086 int ret; 2087 2088 if (!attrs[MACSEC_ATTR_IFINDEX]) 2089 return -EINVAL; 2090 2091 if (parse_sa_config(attrs, tb_sa)) 2092 return -EINVAL; 2093 2094 if (parse_rxsc_config(attrs, tb_rxsc)) 2095 return -EINVAL; 2096 2097 rtnl_lock(); 2098 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2099 &dev, &secy, &rx_sc, &assoc_num); 2100 if (IS_ERR(rx_sa)) { 2101 rtnl_unlock(); 2102 return PTR_ERR(rx_sa); 2103 } 2104 2105 if (rx_sa->active) { 2106 rtnl_unlock(); 2107 return -EBUSY; 2108 } 2109 2110 /* If h/w offloading is available, propagate to the device */ 2111 if (macsec_is_offloaded(netdev_priv(dev))) { 2112 const struct macsec_ops *ops; 2113 struct macsec_context ctx; 2114 2115 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2116 if (!ops) { 2117 ret = -EOPNOTSUPP; 2118 goto cleanup; 2119 } 2120 2121 ctx.sa.assoc_num = assoc_num; 2122 ctx.sa.rx_sa = rx_sa; 2123 ctx.secy = secy; 2124 2125 ret = macsec_offload(ops->mdo_del_rxsa, &ctx); 2126 if (ret) 2127 goto cleanup; 2128 } 2129 2130 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 2131 clear_rx_sa(rx_sa); 2132 2133 rtnl_unlock(); 2134 2135 return 0; 2136 2137 cleanup: 2138 rtnl_unlock(); 2139 return ret; 2140 } 2141 2142 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 2143 { 2144 struct nlattr **attrs = info->attrs; 2145 struct net_device *dev; 2146 struct macsec_secy *secy; 2147 struct macsec_rx_sc *rx_sc; 2148 sci_t sci; 2149 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2150 int ret; 2151 2152 if (!attrs[MACSEC_ATTR_IFINDEX]) 2153 return -EINVAL; 2154 2155 if (parse_rxsc_config(attrs, tb_rxsc)) 2156 return -EINVAL; 2157 2158 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 2159 return -EINVAL; 2160 2161 rtnl_lock(); 2162 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 2163 if (IS_ERR(dev)) { 2164 rtnl_unlock(); 2165 return PTR_ERR(dev); 2166 } 2167 2168 secy = &macsec_priv(dev)->secy; 2169 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 2170 2171 rx_sc = del_rx_sc(secy, sci); 2172 if (!rx_sc) { 2173 rtnl_unlock(); 2174 return -ENODEV; 2175 } 2176 2177 /* If h/w offloading is available, propagate to the device */ 2178 if (macsec_is_offloaded(netdev_priv(dev))) { 2179 const struct macsec_ops *ops; 2180 struct macsec_context ctx; 2181 2182 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2183 if (!ops) { 2184 ret = -EOPNOTSUPP; 2185 goto cleanup; 2186 } 2187 2188 ctx.rx_sc = rx_sc; 2189 ctx.secy = secy; 2190 ret = macsec_offload(ops->mdo_del_rxsc, &ctx); 2191 if (ret) 2192 goto cleanup; 2193 } 2194 2195 free_rx_sc(rx_sc); 2196 rtnl_unlock(); 2197 2198 return 0; 2199 2200 cleanup: 2201 rtnl_unlock(); 2202 return ret; 2203 } 2204 2205 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 2206 { 2207 struct nlattr **attrs = info->attrs; 2208 struct net_device *dev; 2209 struct macsec_secy *secy; 2210 struct macsec_tx_sc *tx_sc; 2211 struct macsec_tx_sa *tx_sa; 2212 u8 assoc_num; 2213 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2214 int ret; 2215 2216 if (!attrs[MACSEC_ATTR_IFINDEX]) 2217 return -EINVAL; 2218 2219 if (parse_sa_config(attrs, tb_sa)) 2220 return -EINVAL; 2221 2222 rtnl_lock(); 2223 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2224 &dev, &secy, &tx_sc, &assoc_num); 2225 if (IS_ERR(tx_sa)) { 2226 rtnl_unlock(); 2227 return PTR_ERR(tx_sa); 2228 } 2229 2230 if (tx_sa->active) { 2231 rtnl_unlock(); 2232 return -EBUSY; 2233 } 2234 2235 /* If h/w offloading is available, propagate to the device */ 2236 if (macsec_is_offloaded(netdev_priv(dev))) { 2237 const struct macsec_ops *ops; 2238 struct macsec_context ctx; 2239 2240 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2241 if (!ops) { 2242 ret = -EOPNOTSUPP; 2243 goto cleanup; 2244 } 2245 2246 ctx.sa.assoc_num = assoc_num; 2247 ctx.sa.tx_sa = tx_sa; 2248 ctx.secy = secy; 2249 2250 ret = macsec_offload(ops->mdo_del_txsa, &ctx); 2251 if (ret) 2252 goto cleanup; 2253 } 2254 2255 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 2256 clear_tx_sa(tx_sa); 2257 2258 rtnl_unlock(); 2259 2260 return 0; 2261 2262 cleanup: 2263 rtnl_unlock(); 2264 return ret; 2265 } 2266 2267 static bool validate_upd_sa(struct nlattr **attrs) 2268 { 2269 if (!attrs[MACSEC_SA_ATTR_AN] || 2270 attrs[MACSEC_SA_ATTR_KEY] || 2271 attrs[MACSEC_SA_ATTR_KEYID] || 2272 attrs[MACSEC_SA_ATTR_SSCI] || 2273 attrs[MACSEC_SA_ATTR_SALT]) 2274 return false; 2275 2276 return true; 2277 } 2278 2279 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2280 { 2281 struct nlattr **attrs = info->attrs; 2282 struct net_device *dev; 2283 struct macsec_secy *secy; 2284 struct macsec_tx_sc *tx_sc; 2285 struct macsec_tx_sa *tx_sa; 2286 u8 assoc_num; 2287 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2288 bool was_operational, was_active; 2289 pn_t prev_pn; 2290 int ret = 0; 2291 2292 prev_pn.full64 = 0; 2293 2294 if (!attrs[MACSEC_ATTR_IFINDEX]) 2295 return -EINVAL; 2296 2297 if (parse_sa_config(attrs, tb_sa)) 2298 return -EINVAL; 2299 2300 if (!validate_upd_sa(tb_sa)) 2301 return -EINVAL; 2302 2303 rtnl_lock(); 2304 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2305 &dev, &secy, &tx_sc, &assoc_num); 2306 if (IS_ERR(tx_sa)) { 2307 rtnl_unlock(); 2308 return PTR_ERR(tx_sa); 2309 } 2310 2311 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2312 int pn_len; 2313 2314 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2315 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2316 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n", 2317 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2318 rtnl_unlock(); 2319 return -EINVAL; 2320 } 2321 2322 spin_lock_bh(&tx_sa->lock); 2323 prev_pn = tx_sa->next_pn_halves; 2324 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2325 spin_unlock_bh(&tx_sa->lock); 2326 } 2327 2328 was_active = tx_sa->active; 2329 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2330 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2331 2332 was_operational = secy->operational; 2333 if (assoc_num == tx_sc->encoding_sa) 2334 secy->operational = tx_sa->active; 2335 2336 /* If h/w offloading is available, propagate to the device */ 2337 if (macsec_is_offloaded(netdev_priv(dev))) { 2338 const struct macsec_ops *ops; 2339 struct macsec_context ctx; 2340 2341 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2342 if (!ops) { 2343 ret = -EOPNOTSUPP; 2344 goto cleanup; 2345 } 2346 2347 ctx.sa.assoc_num = assoc_num; 2348 ctx.sa.tx_sa = tx_sa; 2349 ctx.sa.update_pn = !!prev_pn.full64; 2350 ctx.secy = secy; 2351 2352 ret = macsec_offload(ops->mdo_upd_txsa, &ctx); 2353 if (ret) 2354 goto cleanup; 2355 } 2356 2357 rtnl_unlock(); 2358 2359 return 0; 2360 2361 cleanup: 2362 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2363 spin_lock_bh(&tx_sa->lock); 2364 tx_sa->next_pn_halves = prev_pn; 2365 spin_unlock_bh(&tx_sa->lock); 2366 } 2367 tx_sa->active = was_active; 2368 secy->operational = was_operational; 2369 rtnl_unlock(); 2370 return ret; 2371 } 2372 2373 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2374 { 2375 struct nlattr **attrs = info->attrs; 2376 struct net_device *dev; 2377 struct macsec_secy *secy; 2378 struct macsec_rx_sc *rx_sc; 2379 struct macsec_rx_sa *rx_sa; 2380 u8 assoc_num; 2381 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2382 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2383 bool was_active; 2384 pn_t prev_pn; 2385 int ret = 0; 2386 2387 prev_pn.full64 = 0; 2388 2389 if (!attrs[MACSEC_ATTR_IFINDEX]) 2390 return -EINVAL; 2391 2392 if (parse_rxsc_config(attrs, tb_rxsc)) 2393 return -EINVAL; 2394 2395 if (parse_sa_config(attrs, tb_sa)) 2396 return -EINVAL; 2397 2398 if (!validate_upd_sa(tb_sa)) 2399 return -EINVAL; 2400 2401 rtnl_lock(); 2402 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2403 &dev, &secy, &rx_sc, &assoc_num); 2404 if (IS_ERR(rx_sa)) { 2405 rtnl_unlock(); 2406 return PTR_ERR(rx_sa); 2407 } 2408 2409 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2410 int pn_len; 2411 2412 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2413 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2414 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n", 2415 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2416 rtnl_unlock(); 2417 return -EINVAL; 2418 } 2419 2420 spin_lock_bh(&rx_sa->lock); 2421 prev_pn = rx_sa->next_pn_halves; 2422 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2423 spin_unlock_bh(&rx_sa->lock); 2424 } 2425 2426 was_active = rx_sa->active; 2427 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2428 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2429 2430 /* If h/w offloading is available, propagate to the device */ 2431 if (macsec_is_offloaded(netdev_priv(dev))) { 2432 const struct macsec_ops *ops; 2433 struct macsec_context ctx; 2434 2435 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2436 if (!ops) { 2437 ret = -EOPNOTSUPP; 2438 goto cleanup; 2439 } 2440 2441 ctx.sa.assoc_num = assoc_num; 2442 ctx.sa.rx_sa = rx_sa; 2443 ctx.sa.update_pn = !!prev_pn.full64; 2444 ctx.secy = secy; 2445 2446 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx); 2447 if (ret) 2448 goto cleanup; 2449 } 2450 2451 rtnl_unlock(); 2452 return 0; 2453 2454 cleanup: 2455 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2456 spin_lock_bh(&rx_sa->lock); 2457 rx_sa->next_pn_halves = prev_pn; 2458 spin_unlock_bh(&rx_sa->lock); 2459 } 2460 rx_sa->active = was_active; 2461 rtnl_unlock(); 2462 return ret; 2463 } 2464 2465 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2466 { 2467 struct nlattr **attrs = info->attrs; 2468 struct net_device *dev; 2469 struct macsec_secy *secy; 2470 struct macsec_rx_sc *rx_sc; 2471 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2472 unsigned int prev_n_rx_sc; 2473 bool was_active; 2474 int ret; 2475 2476 if (!attrs[MACSEC_ATTR_IFINDEX]) 2477 return -EINVAL; 2478 2479 if (parse_rxsc_config(attrs, tb_rxsc)) 2480 return -EINVAL; 2481 2482 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 2483 return -EINVAL; 2484 2485 rtnl_lock(); 2486 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2487 if (IS_ERR(rx_sc)) { 2488 rtnl_unlock(); 2489 return PTR_ERR(rx_sc); 2490 } 2491 2492 was_active = rx_sc->active; 2493 prev_n_rx_sc = secy->n_rx_sc; 2494 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2495 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2496 2497 if (rx_sc->active != new) 2498 secy->n_rx_sc += new ? 1 : -1; 2499 2500 rx_sc->active = new; 2501 } 2502 2503 /* If h/w offloading is available, propagate to the device */ 2504 if (macsec_is_offloaded(netdev_priv(dev))) { 2505 const struct macsec_ops *ops; 2506 struct macsec_context ctx; 2507 2508 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2509 if (!ops) { 2510 ret = -EOPNOTSUPP; 2511 goto cleanup; 2512 } 2513 2514 ctx.rx_sc = rx_sc; 2515 ctx.secy = secy; 2516 2517 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx); 2518 if (ret) 2519 goto cleanup; 2520 } 2521 2522 rtnl_unlock(); 2523 2524 return 0; 2525 2526 cleanup: 2527 secy->n_rx_sc = prev_n_rx_sc; 2528 rx_sc->active = was_active; 2529 rtnl_unlock(); 2530 return ret; 2531 } 2532 2533 static bool macsec_is_configured(struct macsec_dev *macsec) 2534 { 2535 struct macsec_secy *secy = &macsec->secy; 2536 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2537 int i; 2538 2539 if (secy->rx_sc) 2540 return true; 2541 2542 for (i = 0; i < MACSEC_NUM_AN; i++) 2543 if (tx_sc->sa[i]) 2544 return true; 2545 2546 return false; 2547 } 2548 2549 static bool macsec_needs_tx_tag(struct macsec_dev *macsec, 2550 const struct macsec_ops *ops) 2551 { 2552 return macsec->offload == MACSEC_OFFLOAD_PHY && 2553 ops->mdo_insert_tx_tag; 2554 } 2555 2556 static void macsec_set_head_tail_room(struct net_device *dev) 2557 { 2558 struct macsec_dev *macsec = macsec_priv(dev); 2559 struct net_device *real_dev = macsec->real_dev; 2560 int needed_headroom, needed_tailroom; 2561 const struct macsec_ops *ops; 2562 2563 ops = macsec_get_ops(macsec, NULL); 2564 if (ops) { 2565 needed_headroom = ops->needed_headroom; 2566 needed_tailroom = ops->needed_tailroom; 2567 } else { 2568 needed_headroom = MACSEC_NEEDED_HEADROOM; 2569 needed_tailroom = MACSEC_NEEDED_TAILROOM; 2570 } 2571 2572 dev->needed_headroom = real_dev->needed_headroom + needed_headroom; 2573 dev->needed_tailroom = real_dev->needed_tailroom + needed_tailroom; 2574 } 2575 2576 static void macsec_inherit_tso_max(struct net_device *dev) 2577 { 2578 struct macsec_dev *macsec = macsec_priv(dev); 2579 2580 /* if macsec is offloaded, we need to follow the lower 2581 * device's capabilities. otherwise, we can ignore them. 2582 */ 2583 if (macsec_is_offloaded(macsec)) 2584 netif_inherit_tso_max(dev, macsec->real_dev); 2585 } 2586 2587 static int macsec_update_offload(struct net_device *dev, enum macsec_offload offload) 2588 { 2589 enum macsec_offload prev_offload; 2590 const struct macsec_ops *ops; 2591 struct macsec_context ctx; 2592 struct macsec_dev *macsec; 2593 int ret = 0; 2594 2595 macsec = macsec_priv(dev); 2596 2597 /* Check if the offloading mode is supported by the underlying layers */ 2598 if (offload != MACSEC_OFFLOAD_OFF && 2599 !macsec_check_offload(offload, macsec)) 2600 return -EOPNOTSUPP; 2601 2602 /* Check if the net device is busy. */ 2603 if (netif_running(dev)) 2604 return -EBUSY; 2605 2606 /* Check if the device already has rules configured: we do not support 2607 * rules migration. 2608 */ 2609 if (macsec_is_configured(macsec)) 2610 return -EBUSY; 2611 2612 prev_offload = macsec->offload; 2613 2614 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload, 2615 macsec, &ctx); 2616 if (!ops) 2617 return -EOPNOTSUPP; 2618 2619 macsec->offload = offload; 2620 2621 ctx.secy = &macsec->secy; 2622 ret = offload == MACSEC_OFFLOAD_OFF ? macsec_offload(ops->mdo_del_secy, &ctx) 2623 : macsec_offload(ops->mdo_add_secy, &ctx); 2624 if (ret) { 2625 macsec->offload = prev_offload; 2626 return ret; 2627 } 2628 2629 macsec_set_head_tail_room(dev); 2630 macsec->insert_tx_tag = macsec_needs_tx_tag(macsec, ops); 2631 2632 macsec_inherit_tso_max(dev); 2633 2634 netdev_update_features(dev); 2635 2636 return ret; 2637 } 2638 2639 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info) 2640 { 2641 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1]; 2642 struct nlattr **attrs = info->attrs; 2643 enum macsec_offload offload; 2644 struct macsec_dev *macsec; 2645 struct net_device *dev; 2646 int ret = 0; 2647 2648 if (!attrs[MACSEC_ATTR_IFINDEX]) 2649 return -EINVAL; 2650 2651 if (!attrs[MACSEC_ATTR_OFFLOAD]) 2652 return -EINVAL; 2653 2654 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX, 2655 attrs[MACSEC_ATTR_OFFLOAD], 2656 macsec_genl_offload_policy, NULL)) 2657 return -EINVAL; 2658 2659 rtnl_lock(); 2660 2661 dev = get_dev_from_nl(genl_info_net(info), attrs); 2662 if (IS_ERR(dev)) { 2663 ret = PTR_ERR(dev); 2664 goto out; 2665 } 2666 macsec = macsec_priv(dev); 2667 2668 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) { 2669 ret = -EINVAL; 2670 goto out; 2671 } 2672 2673 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]); 2674 2675 if (macsec->offload != offload) 2676 ret = macsec_update_offload(dev, offload); 2677 out: 2678 rtnl_unlock(); 2679 return ret; 2680 } 2681 2682 static void get_tx_sa_stats(struct net_device *dev, int an, 2683 struct macsec_tx_sa *tx_sa, 2684 struct macsec_tx_sa_stats *sum) 2685 { 2686 struct macsec_dev *macsec = macsec_priv(dev); 2687 int cpu; 2688 2689 /* If h/w offloading is available, propagate to the device */ 2690 if (macsec_is_offloaded(macsec)) { 2691 const struct macsec_ops *ops; 2692 struct macsec_context ctx; 2693 2694 ops = macsec_get_ops(macsec, &ctx); 2695 if (ops) { 2696 ctx.sa.assoc_num = an; 2697 ctx.sa.tx_sa = tx_sa; 2698 ctx.stats.tx_sa_stats = sum; 2699 ctx.secy = &macsec_priv(dev)->secy; 2700 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx); 2701 } 2702 return; 2703 } 2704 2705 for_each_possible_cpu(cpu) { 2706 const struct macsec_tx_sa_stats *stats = 2707 per_cpu_ptr(tx_sa->stats, cpu); 2708 2709 sum->OutPktsProtected += stats->OutPktsProtected; 2710 sum->OutPktsEncrypted += stats->OutPktsEncrypted; 2711 } 2712 } 2713 2714 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum) 2715 { 2716 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, 2717 sum->OutPktsProtected) || 2718 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2719 sum->OutPktsEncrypted)) 2720 return -EMSGSIZE; 2721 2722 return 0; 2723 } 2724 2725 static void get_rx_sa_stats(struct net_device *dev, 2726 struct macsec_rx_sc *rx_sc, int an, 2727 struct macsec_rx_sa *rx_sa, 2728 struct macsec_rx_sa_stats *sum) 2729 { 2730 struct macsec_dev *macsec = macsec_priv(dev); 2731 int cpu; 2732 2733 /* If h/w offloading is available, propagate to the device */ 2734 if (macsec_is_offloaded(macsec)) { 2735 const struct macsec_ops *ops; 2736 struct macsec_context ctx; 2737 2738 ops = macsec_get_ops(macsec, &ctx); 2739 if (ops) { 2740 ctx.sa.assoc_num = an; 2741 ctx.sa.rx_sa = rx_sa; 2742 ctx.stats.rx_sa_stats = sum; 2743 ctx.secy = &macsec_priv(dev)->secy; 2744 ctx.rx_sc = rx_sc; 2745 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx); 2746 } 2747 return; 2748 } 2749 2750 for_each_possible_cpu(cpu) { 2751 const struct macsec_rx_sa_stats *stats = 2752 per_cpu_ptr(rx_sa->stats, cpu); 2753 2754 sum->InPktsOK += stats->InPktsOK; 2755 sum->InPktsInvalid += stats->InPktsInvalid; 2756 sum->InPktsNotValid += stats->InPktsNotValid; 2757 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA; 2758 sum->InPktsUnusedSA += stats->InPktsUnusedSA; 2759 } 2760 } 2761 2762 static int copy_rx_sa_stats(struct sk_buff *skb, 2763 struct macsec_rx_sa_stats *sum) 2764 { 2765 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) || 2766 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, 2767 sum->InPktsInvalid) || 2768 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, 2769 sum->InPktsNotValid) || 2770 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2771 sum->InPktsNotUsingSA) || 2772 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, 2773 sum->InPktsUnusedSA)) 2774 return -EMSGSIZE; 2775 2776 return 0; 2777 } 2778 2779 static void get_rx_sc_stats(struct net_device *dev, 2780 struct macsec_rx_sc *rx_sc, 2781 struct macsec_rx_sc_stats *sum) 2782 { 2783 struct macsec_dev *macsec = macsec_priv(dev); 2784 int cpu; 2785 2786 /* If h/w offloading is available, propagate to the device */ 2787 if (macsec_is_offloaded(macsec)) { 2788 const struct macsec_ops *ops; 2789 struct macsec_context ctx; 2790 2791 ops = macsec_get_ops(macsec, &ctx); 2792 if (ops) { 2793 ctx.stats.rx_sc_stats = sum; 2794 ctx.secy = &macsec_priv(dev)->secy; 2795 ctx.rx_sc = rx_sc; 2796 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx); 2797 } 2798 return; 2799 } 2800 2801 for_each_possible_cpu(cpu) { 2802 const struct pcpu_rx_sc_stats *stats; 2803 struct macsec_rx_sc_stats tmp; 2804 unsigned int start; 2805 2806 stats = per_cpu_ptr(rx_sc->stats, cpu); 2807 do { 2808 start = u64_stats_fetch_begin(&stats->syncp); 2809 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2810 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2811 2812 sum->InOctetsValidated += tmp.InOctetsValidated; 2813 sum->InOctetsDecrypted += tmp.InOctetsDecrypted; 2814 sum->InPktsUnchecked += tmp.InPktsUnchecked; 2815 sum->InPktsDelayed += tmp.InPktsDelayed; 2816 sum->InPktsOK += tmp.InPktsOK; 2817 sum->InPktsInvalid += tmp.InPktsInvalid; 2818 sum->InPktsLate += tmp.InPktsLate; 2819 sum->InPktsNotValid += tmp.InPktsNotValid; 2820 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2821 sum->InPktsUnusedSA += tmp.InPktsUnusedSA; 2822 } 2823 } 2824 2825 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum) 2826 { 2827 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2828 sum->InOctetsValidated, 2829 MACSEC_RXSC_STATS_ATTR_PAD) || 2830 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2831 sum->InOctetsDecrypted, 2832 MACSEC_RXSC_STATS_ATTR_PAD) || 2833 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2834 sum->InPktsUnchecked, 2835 MACSEC_RXSC_STATS_ATTR_PAD) || 2836 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2837 sum->InPktsDelayed, 2838 MACSEC_RXSC_STATS_ATTR_PAD) || 2839 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2840 sum->InPktsOK, 2841 MACSEC_RXSC_STATS_ATTR_PAD) || 2842 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2843 sum->InPktsInvalid, 2844 MACSEC_RXSC_STATS_ATTR_PAD) || 2845 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2846 sum->InPktsLate, 2847 MACSEC_RXSC_STATS_ATTR_PAD) || 2848 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2849 sum->InPktsNotValid, 2850 MACSEC_RXSC_STATS_ATTR_PAD) || 2851 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2852 sum->InPktsNotUsingSA, 2853 MACSEC_RXSC_STATS_ATTR_PAD) || 2854 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2855 sum->InPktsUnusedSA, 2856 MACSEC_RXSC_STATS_ATTR_PAD)) 2857 return -EMSGSIZE; 2858 2859 return 0; 2860 } 2861 2862 static void get_tx_sc_stats(struct net_device *dev, 2863 struct macsec_tx_sc_stats *sum) 2864 { 2865 struct macsec_dev *macsec = macsec_priv(dev); 2866 int cpu; 2867 2868 /* If h/w offloading is available, propagate to the device */ 2869 if (macsec_is_offloaded(macsec)) { 2870 const struct macsec_ops *ops; 2871 struct macsec_context ctx; 2872 2873 ops = macsec_get_ops(macsec, &ctx); 2874 if (ops) { 2875 ctx.stats.tx_sc_stats = sum; 2876 ctx.secy = &macsec_priv(dev)->secy; 2877 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx); 2878 } 2879 return; 2880 } 2881 2882 for_each_possible_cpu(cpu) { 2883 const struct pcpu_tx_sc_stats *stats; 2884 struct macsec_tx_sc_stats tmp; 2885 unsigned int start; 2886 2887 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu); 2888 do { 2889 start = u64_stats_fetch_begin(&stats->syncp); 2890 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2891 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2892 2893 sum->OutPktsProtected += tmp.OutPktsProtected; 2894 sum->OutPktsEncrypted += tmp.OutPktsEncrypted; 2895 sum->OutOctetsProtected += tmp.OutOctetsProtected; 2896 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2897 } 2898 } 2899 2900 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum) 2901 { 2902 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2903 sum->OutPktsProtected, 2904 MACSEC_TXSC_STATS_ATTR_PAD) || 2905 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2906 sum->OutPktsEncrypted, 2907 MACSEC_TXSC_STATS_ATTR_PAD) || 2908 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2909 sum->OutOctetsProtected, 2910 MACSEC_TXSC_STATS_ATTR_PAD) || 2911 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2912 sum->OutOctetsEncrypted, 2913 MACSEC_TXSC_STATS_ATTR_PAD)) 2914 return -EMSGSIZE; 2915 2916 return 0; 2917 } 2918 2919 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum) 2920 { 2921 struct macsec_dev *macsec = macsec_priv(dev); 2922 int cpu; 2923 2924 /* If h/w offloading is available, propagate to the device */ 2925 if (macsec_is_offloaded(macsec)) { 2926 const struct macsec_ops *ops; 2927 struct macsec_context ctx; 2928 2929 ops = macsec_get_ops(macsec, &ctx); 2930 if (ops) { 2931 ctx.stats.dev_stats = sum; 2932 ctx.secy = &macsec_priv(dev)->secy; 2933 macsec_offload(ops->mdo_get_dev_stats, &ctx); 2934 } 2935 return; 2936 } 2937 2938 for_each_possible_cpu(cpu) { 2939 const struct pcpu_secy_stats *stats; 2940 struct macsec_dev_stats tmp; 2941 unsigned int start; 2942 2943 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu); 2944 do { 2945 start = u64_stats_fetch_begin(&stats->syncp); 2946 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2947 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2948 2949 sum->OutPktsUntagged += tmp.OutPktsUntagged; 2950 sum->InPktsUntagged += tmp.InPktsUntagged; 2951 sum->OutPktsTooLong += tmp.OutPktsTooLong; 2952 sum->InPktsNoTag += tmp.InPktsNoTag; 2953 sum->InPktsBadTag += tmp.InPktsBadTag; 2954 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2955 sum->InPktsNoSCI += tmp.InPktsNoSCI; 2956 sum->InPktsOverrun += tmp.InPktsOverrun; 2957 } 2958 } 2959 2960 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum) 2961 { 2962 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 2963 sum->OutPktsUntagged, 2964 MACSEC_SECY_STATS_ATTR_PAD) || 2965 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 2966 sum->InPktsUntagged, 2967 MACSEC_SECY_STATS_ATTR_PAD) || 2968 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 2969 sum->OutPktsTooLong, 2970 MACSEC_SECY_STATS_ATTR_PAD) || 2971 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 2972 sum->InPktsNoTag, 2973 MACSEC_SECY_STATS_ATTR_PAD) || 2974 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 2975 sum->InPktsBadTag, 2976 MACSEC_SECY_STATS_ATTR_PAD) || 2977 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 2978 sum->InPktsUnknownSCI, 2979 MACSEC_SECY_STATS_ATTR_PAD) || 2980 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 2981 sum->InPktsNoSCI, 2982 MACSEC_SECY_STATS_ATTR_PAD) || 2983 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 2984 sum->InPktsOverrun, 2985 MACSEC_SECY_STATS_ATTR_PAD)) 2986 return -EMSGSIZE; 2987 2988 return 0; 2989 } 2990 2991 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 2992 { 2993 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2994 struct nlattr *secy_nest = nla_nest_start_noflag(skb, 2995 MACSEC_ATTR_SECY); 2996 u64 csid; 2997 2998 if (!secy_nest) 2999 return 1; 3000 3001 switch (secy->key_len) { 3002 case MACSEC_GCM_AES_128_SAK_LEN: 3003 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 3004 break; 3005 case MACSEC_GCM_AES_256_SAK_LEN: 3006 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 3007 break; 3008 default: 3009 goto cancel; 3010 } 3011 3012 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 3013 MACSEC_SECY_ATTR_PAD) || 3014 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 3015 csid, MACSEC_SECY_ATTR_PAD) || 3016 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 3017 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 3018 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 3019 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 3020 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 3021 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 3022 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 3023 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 3024 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 3025 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 3026 goto cancel; 3027 3028 if (secy->replay_protect) { 3029 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 3030 goto cancel; 3031 } 3032 3033 nla_nest_end(skb, secy_nest); 3034 return 0; 3035 3036 cancel: 3037 nla_nest_cancel(skb, secy_nest); 3038 return 1; 3039 } 3040 3041 static noinline_for_stack int 3042 dump_secy(struct macsec_secy *secy, struct net_device *dev, 3043 struct sk_buff *skb, struct netlink_callback *cb) 3044 { 3045 struct macsec_tx_sc_stats tx_sc_stats = {0, }; 3046 struct macsec_tx_sa_stats tx_sa_stats = {0, }; 3047 struct macsec_rx_sc_stats rx_sc_stats = {0, }; 3048 struct macsec_rx_sa_stats rx_sa_stats = {0, }; 3049 struct macsec_dev *macsec = netdev_priv(dev); 3050 struct macsec_dev_stats dev_stats = {0, }; 3051 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3052 struct nlattr *txsa_list, *rxsc_list; 3053 struct macsec_rx_sc *rx_sc; 3054 struct nlattr *attr; 3055 void *hdr; 3056 int i, j; 3057 3058 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3059 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 3060 if (!hdr) 3061 return -EMSGSIZE; 3062 3063 genl_dump_check_consistent(cb, hdr); 3064 3065 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 3066 goto nla_put_failure; 3067 3068 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD); 3069 if (!attr) 3070 goto nla_put_failure; 3071 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload)) 3072 goto nla_put_failure; 3073 nla_nest_end(skb, attr); 3074 3075 if (nla_put_secy(secy, skb)) 3076 goto nla_put_failure; 3077 3078 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS); 3079 if (!attr) 3080 goto nla_put_failure; 3081 3082 get_tx_sc_stats(dev, &tx_sc_stats); 3083 if (copy_tx_sc_stats(skb, &tx_sc_stats)) { 3084 nla_nest_cancel(skb, attr); 3085 goto nla_put_failure; 3086 } 3087 nla_nest_end(skb, attr); 3088 3089 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS); 3090 if (!attr) 3091 goto nla_put_failure; 3092 get_secy_stats(dev, &dev_stats); 3093 if (copy_secy_stats(skb, &dev_stats)) { 3094 nla_nest_cancel(skb, attr); 3095 goto nla_put_failure; 3096 } 3097 nla_nest_end(skb, attr); 3098 3099 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST); 3100 if (!txsa_list) 3101 goto nla_put_failure; 3102 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 3103 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 3104 struct nlattr *txsa_nest; 3105 u64 pn; 3106 int pn_len; 3107 3108 if (!tx_sa) 3109 continue; 3110 3111 txsa_nest = nla_nest_start_noflag(skb, j++); 3112 if (!txsa_nest) { 3113 nla_nest_cancel(skb, txsa_list); 3114 goto nla_put_failure; 3115 } 3116 3117 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS); 3118 if (!attr) { 3119 nla_nest_cancel(skb, txsa_nest); 3120 nla_nest_cancel(skb, txsa_list); 3121 goto nla_put_failure; 3122 } 3123 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats)); 3124 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats); 3125 if (copy_tx_sa_stats(skb, &tx_sa_stats)) { 3126 nla_nest_cancel(skb, attr); 3127 nla_nest_cancel(skb, txsa_nest); 3128 nla_nest_cancel(skb, txsa_list); 3129 goto nla_put_failure; 3130 } 3131 nla_nest_end(skb, attr); 3132 3133 if (secy->xpn) { 3134 pn = tx_sa->next_pn; 3135 pn_len = MACSEC_XPN_PN_LEN; 3136 } else { 3137 pn = tx_sa->next_pn_halves.lower; 3138 pn_len = MACSEC_DEFAULT_PN_LEN; 3139 } 3140 3141 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3142 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3143 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 3144 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) || 3145 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 3146 nla_nest_cancel(skb, txsa_nest); 3147 nla_nest_cancel(skb, txsa_list); 3148 goto nla_put_failure; 3149 } 3150 3151 nla_nest_end(skb, txsa_nest); 3152 } 3153 nla_nest_end(skb, txsa_list); 3154 3155 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST); 3156 if (!rxsc_list) 3157 goto nla_put_failure; 3158 3159 j = 1; 3160 for_each_rxsc_rtnl(secy, rx_sc) { 3161 int k; 3162 struct nlattr *rxsa_list; 3163 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++); 3164 3165 if (!rxsc_nest) { 3166 nla_nest_cancel(skb, rxsc_list); 3167 goto nla_put_failure; 3168 } 3169 3170 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 3171 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 3172 MACSEC_RXSC_ATTR_PAD)) { 3173 nla_nest_cancel(skb, rxsc_nest); 3174 nla_nest_cancel(skb, rxsc_list); 3175 goto nla_put_failure; 3176 } 3177 3178 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS); 3179 if (!attr) { 3180 nla_nest_cancel(skb, rxsc_nest); 3181 nla_nest_cancel(skb, rxsc_list); 3182 goto nla_put_failure; 3183 } 3184 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats)); 3185 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats); 3186 if (copy_rx_sc_stats(skb, &rx_sc_stats)) { 3187 nla_nest_cancel(skb, attr); 3188 nla_nest_cancel(skb, rxsc_nest); 3189 nla_nest_cancel(skb, rxsc_list); 3190 goto nla_put_failure; 3191 } 3192 nla_nest_end(skb, attr); 3193 3194 rxsa_list = nla_nest_start_noflag(skb, 3195 MACSEC_RXSC_ATTR_SA_LIST); 3196 if (!rxsa_list) { 3197 nla_nest_cancel(skb, rxsc_nest); 3198 nla_nest_cancel(skb, rxsc_list); 3199 goto nla_put_failure; 3200 } 3201 3202 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 3203 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 3204 struct nlattr *rxsa_nest; 3205 u64 pn; 3206 int pn_len; 3207 3208 if (!rx_sa) 3209 continue; 3210 3211 rxsa_nest = nla_nest_start_noflag(skb, k++); 3212 if (!rxsa_nest) { 3213 nla_nest_cancel(skb, rxsa_list); 3214 nla_nest_cancel(skb, rxsc_nest); 3215 nla_nest_cancel(skb, rxsc_list); 3216 goto nla_put_failure; 3217 } 3218 3219 attr = nla_nest_start_noflag(skb, 3220 MACSEC_SA_ATTR_STATS); 3221 if (!attr) { 3222 nla_nest_cancel(skb, rxsa_list); 3223 nla_nest_cancel(skb, rxsc_nest); 3224 nla_nest_cancel(skb, rxsc_list); 3225 goto nla_put_failure; 3226 } 3227 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats)); 3228 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats); 3229 if (copy_rx_sa_stats(skb, &rx_sa_stats)) { 3230 nla_nest_cancel(skb, attr); 3231 nla_nest_cancel(skb, rxsa_list); 3232 nla_nest_cancel(skb, rxsc_nest); 3233 nla_nest_cancel(skb, rxsc_list); 3234 goto nla_put_failure; 3235 } 3236 nla_nest_end(skb, attr); 3237 3238 if (secy->xpn) { 3239 pn = rx_sa->next_pn; 3240 pn_len = MACSEC_XPN_PN_LEN; 3241 } else { 3242 pn = rx_sa->next_pn_halves.lower; 3243 pn_len = MACSEC_DEFAULT_PN_LEN; 3244 } 3245 3246 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3247 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3248 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 3249 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) || 3250 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 3251 nla_nest_cancel(skb, rxsa_nest); 3252 nla_nest_cancel(skb, rxsc_nest); 3253 nla_nest_cancel(skb, rxsc_list); 3254 goto nla_put_failure; 3255 } 3256 nla_nest_end(skb, rxsa_nest); 3257 } 3258 3259 nla_nest_end(skb, rxsa_list); 3260 nla_nest_end(skb, rxsc_nest); 3261 } 3262 3263 nla_nest_end(skb, rxsc_list); 3264 3265 genlmsg_end(skb, hdr); 3266 3267 return 0; 3268 3269 nla_put_failure: 3270 genlmsg_cancel(skb, hdr); 3271 return -EMSGSIZE; 3272 } 3273 3274 static int macsec_generation = 1; /* protected by RTNL */ 3275 3276 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 3277 { 3278 struct net *net = sock_net(skb->sk); 3279 struct net_device *dev; 3280 int dev_idx, d; 3281 3282 dev_idx = cb->args[0]; 3283 3284 d = 0; 3285 rtnl_lock(); 3286 3287 cb->seq = macsec_generation; 3288 3289 for_each_netdev(net, dev) { 3290 struct macsec_secy *secy; 3291 3292 if (d < dev_idx) 3293 goto next; 3294 3295 if (!netif_is_macsec(dev)) 3296 goto next; 3297 3298 secy = &macsec_priv(dev)->secy; 3299 if (dump_secy(secy, dev, skb, cb) < 0) 3300 goto done; 3301 next: 3302 d++; 3303 } 3304 3305 done: 3306 rtnl_unlock(); 3307 cb->args[0] = d; 3308 return skb->len; 3309 } 3310 3311 static const struct genl_small_ops macsec_genl_ops[] = { 3312 { 3313 .cmd = MACSEC_CMD_GET_TXSC, 3314 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3315 .dumpit = macsec_dump_txsc, 3316 }, 3317 { 3318 .cmd = MACSEC_CMD_ADD_RXSC, 3319 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3320 .doit = macsec_add_rxsc, 3321 .flags = GENL_ADMIN_PERM, 3322 }, 3323 { 3324 .cmd = MACSEC_CMD_DEL_RXSC, 3325 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3326 .doit = macsec_del_rxsc, 3327 .flags = GENL_ADMIN_PERM, 3328 }, 3329 { 3330 .cmd = MACSEC_CMD_UPD_RXSC, 3331 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3332 .doit = macsec_upd_rxsc, 3333 .flags = GENL_ADMIN_PERM, 3334 }, 3335 { 3336 .cmd = MACSEC_CMD_ADD_TXSA, 3337 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3338 .doit = macsec_add_txsa, 3339 .flags = GENL_ADMIN_PERM, 3340 }, 3341 { 3342 .cmd = MACSEC_CMD_DEL_TXSA, 3343 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3344 .doit = macsec_del_txsa, 3345 .flags = GENL_ADMIN_PERM, 3346 }, 3347 { 3348 .cmd = MACSEC_CMD_UPD_TXSA, 3349 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3350 .doit = macsec_upd_txsa, 3351 .flags = GENL_ADMIN_PERM, 3352 }, 3353 { 3354 .cmd = MACSEC_CMD_ADD_RXSA, 3355 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3356 .doit = macsec_add_rxsa, 3357 .flags = GENL_ADMIN_PERM, 3358 }, 3359 { 3360 .cmd = MACSEC_CMD_DEL_RXSA, 3361 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3362 .doit = macsec_del_rxsa, 3363 .flags = GENL_ADMIN_PERM, 3364 }, 3365 { 3366 .cmd = MACSEC_CMD_UPD_RXSA, 3367 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3368 .doit = macsec_upd_rxsa, 3369 .flags = GENL_ADMIN_PERM, 3370 }, 3371 { 3372 .cmd = MACSEC_CMD_UPD_OFFLOAD, 3373 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3374 .doit = macsec_upd_offload, 3375 .flags = GENL_ADMIN_PERM, 3376 }, 3377 }; 3378 3379 static struct genl_family macsec_fam __ro_after_init = { 3380 .name = MACSEC_GENL_NAME, 3381 .hdrsize = 0, 3382 .version = MACSEC_GENL_VERSION, 3383 .maxattr = MACSEC_ATTR_MAX, 3384 .policy = macsec_genl_policy, 3385 .netnsok = true, 3386 .module = THIS_MODULE, 3387 .small_ops = macsec_genl_ops, 3388 .n_small_ops = ARRAY_SIZE(macsec_genl_ops), 3389 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1, 3390 }; 3391 3392 static struct sk_buff *macsec_insert_tx_tag(struct sk_buff *skb, 3393 struct net_device *dev) 3394 { 3395 struct macsec_dev *macsec = macsec_priv(dev); 3396 const struct macsec_ops *ops; 3397 struct phy_device *phydev; 3398 struct macsec_context ctx; 3399 int skb_final_len; 3400 int err; 3401 3402 ops = macsec_get_ops(macsec, &ctx); 3403 skb_final_len = skb->len - ETH_HLEN + ops->needed_headroom + 3404 ops->needed_tailroom; 3405 if (unlikely(skb_final_len > macsec->real_dev->mtu)) { 3406 err = -EINVAL; 3407 goto cleanup; 3408 } 3409 3410 phydev = macsec->real_dev->phydev; 3411 3412 err = skb_ensure_writable_head_tail(skb, dev); 3413 if (unlikely(err < 0)) 3414 goto cleanup; 3415 3416 err = ops->mdo_insert_tx_tag(phydev, skb); 3417 if (unlikely(err)) 3418 goto cleanup; 3419 3420 return skb; 3421 cleanup: 3422 kfree_skb(skb); 3423 return ERR_PTR(err); 3424 } 3425 3426 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 3427 struct net_device *dev) 3428 { 3429 struct macsec_dev *macsec = netdev_priv(dev); 3430 struct macsec_secy *secy = &macsec->secy; 3431 struct pcpu_secy_stats *secy_stats; 3432 int ret, len; 3433 3434 if (macsec_is_offloaded(netdev_priv(dev))) { 3435 struct metadata_dst *md_dst = secy->tx_sc.md_dst; 3436 3437 skb_dst_drop(skb); 3438 dst_hold(&md_dst->dst); 3439 skb_dst_set(skb, &md_dst->dst); 3440 3441 if (macsec->insert_tx_tag) { 3442 skb = macsec_insert_tx_tag(skb, dev); 3443 if (IS_ERR(skb)) { 3444 DEV_STATS_INC(dev, tx_dropped); 3445 return NETDEV_TX_OK; 3446 } 3447 } 3448 3449 skb->dev = macsec->real_dev; 3450 return dev_queue_xmit(skb); 3451 } 3452 3453 /* 10.5 */ 3454 if (!secy->protect_frames) { 3455 secy_stats = this_cpu_ptr(macsec->stats); 3456 u64_stats_update_begin(&secy_stats->syncp); 3457 secy_stats->stats.OutPktsUntagged++; 3458 u64_stats_update_end(&secy_stats->syncp); 3459 skb->dev = macsec->real_dev; 3460 len = skb->len; 3461 ret = dev_queue_xmit(skb); 3462 count_tx(dev, ret, len); 3463 return ret; 3464 } 3465 3466 if (!secy->operational) { 3467 kfree_skb(skb); 3468 DEV_STATS_INC(dev, tx_dropped); 3469 return NETDEV_TX_OK; 3470 } 3471 3472 len = skb->len; 3473 skb = macsec_encrypt(skb, dev); 3474 if (IS_ERR(skb)) { 3475 if (PTR_ERR(skb) != -EINPROGRESS) 3476 DEV_STATS_INC(dev, tx_dropped); 3477 return NETDEV_TX_OK; 3478 } 3479 3480 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 3481 3482 macsec_encrypt_finish(skb, dev); 3483 ret = dev_queue_xmit(skb); 3484 count_tx(dev, ret, len); 3485 return ret; 3486 } 3487 3488 #define MACSEC_FEATURES \ 3489 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 3490 3491 #define MACSEC_OFFLOAD_FEATURES \ 3492 (MACSEC_FEATURES | NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES | \ 3493 NETIF_F_LRO | NETIF_F_RXHASH | NETIF_F_CSUM_MASK | NETIF_F_RXCSUM) 3494 3495 static int macsec_dev_init(struct net_device *dev) 3496 { 3497 struct macsec_dev *macsec = macsec_priv(dev); 3498 struct net_device *real_dev = macsec->real_dev; 3499 int err; 3500 3501 err = gro_cells_init(&macsec->gro_cells, dev); 3502 if (err) 3503 return err; 3504 3505 macsec_inherit_tso_max(dev); 3506 3507 dev->hw_features = real_dev->hw_features & MACSEC_OFFLOAD_FEATURES; 3508 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 3509 3510 dev->features = real_dev->features & MACSEC_OFFLOAD_FEATURES; 3511 dev->features |= NETIF_F_GSO_SOFTWARE; 3512 dev->lltx = true; 3513 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 3514 3515 macsec_set_head_tail_room(dev); 3516 3517 if (is_zero_ether_addr(dev->dev_addr)) 3518 eth_hw_addr_inherit(dev, real_dev); 3519 if (is_zero_ether_addr(dev->broadcast)) 3520 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 3521 3522 /* Get macsec's reference to real_dev */ 3523 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL); 3524 3525 return 0; 3526 } 3527 3528 static void macsec_dev_uninit(struct net_device *dev) 3529 { 3530 struct macsec_dev *macsec = macsec_priv(dev); 3531 3532 gro_cells_destroy(&macsec->gro_cells); 3533 } 3534 3535 static netdev_features_t macsec_fix_features(struct net_device *dev, 3536 netdev_features_t features) 3537 { 3538 struct macsec_dev *macsec = macsec_priv(dev); 3539 struct net_device *real_dev = macsec->real_dev; 3540 netdev_features_t mask; 3541 3542 mask = macsec_is_offloaded(macsec) ? MACSEC_OFFLOAD_FEATURES 3543 : MACSEC_FEATURES; 3544 3545 features &= (real_dev->features & mask) | 3546 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 3547 3548 return features; 3549 } 3550 3551 static int macsec_dev_open(struct net_device *dev) 3552 { 3553 struct macsec_dev *macsec = macsec_priv(dev); 3554 struct net_device *real_dev = macsec->real_dev; 3555 int err; 3556 3557 err = dev_uc_add(real_dev, dev->dev_addr); 3558 if (err < 0) 3559 return err; 3560 3561 if (dev->flags & IFF_ALLMULTI) { 3562 err = dev_set_allmulti(real_dev, 1); 3563 if (err < 0) 3564 goto del_unicast; 3565 } 3566 3567 if (dev->flags & IFF_PROMISC) { 3568 err = dev_set_promiscuity(real_dev, 1); 3569 if (err < 0) 3570 goto clear_allmulti; 3571 } 3572 3573 /* If h/w offloading is available, propagate to the device */ 3574 if (macsec_is_offloaded(macsec)) { 3575 const struct macsec_ops *ops; 3576 struct macsec_context ctx; 3577 3578 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3579 if (!ops) { 3580 err = -EOPNOTSUPP; 3581 goto clear_allmulti; 3582 } 3583 3584 ctx.secy = &macsec->secy; 3585 err = macsec_offload(ops->mdo_dev_open, &ctx); 3586 if (err) 3587 goto clear_allmulti; 3588 } 3589 3590 if (netif_carrier_ok(real_dev)) 3591 netif_carrier_on(dev); 3592 3593 return 0; 3594 clear_allmulti: 3595 if (dev->flags & IFF_ALLMULTI) 3596 dev_set_allmulti(real_dev, -1); 3597 del_unicast: 3598 dev_uc_del(real_dev, dev->dev_addr); 3599 netif_carrier_off(dev); 3600 return err; 3601 } 3602 3603 static int macsec_dev_stop(struct net_device *dev) 3604 { 3605 struct macsec_dev *macsec = macsec_priv(dev); 3606 struct net_device *real_dev = macsec->real_dev; 3607 3608 netif_carrier_off(dev); 3609 3610 /* If h/w offloading is available, propagate to the device */ 3611 if (macsec_is_offloaded(macsec)) { 3612 const struct macsec_ops *ops; 3613 struct macsec_context ctx; 3614 3615 ops = macsec_get_ops(macsec, &ctx); 3616 if (ops) { 3617 ctx.secy = &macsec->secy; 3618 macsec_offload(ops->mdo_dev_stop, &ctx); 3619 } 3620 } 3621 3622 dev_mc_unsync(real_dev, dev); 3623 dev_uc_unsync(real_dev, dev); 3624 3625 if (dev->flags & IFF_ALLMULTI) 3626 dev_set_allmulti(real_dev, -1); 3627 3628 if (dev->flags & IFF_PROMISC) 3629 dev_set_promiscuity(real_dev, -1); 3630 3631 dev_uc_del(real_dev, dev->dev_addr); 3632 3633 return 0; 3634 } 3635 3636 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 3637 { 3638 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3639 3640 if (!(dev->flags & IFF_UP)) 3641 return; 3642 3643 if (change & IFF_ALLMULTI) 3644 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 3645 3646 if (change & IFF_PROMISC) 3647 dev_set_promiscuity(real_dev, 3648 dev->flags & IFF_PROMISC ? 1 : -1); 3649 } 3650 3651 static void macsec_dev_set_rx_mode(struct net_device *dev) 3652 { 3653 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3654 3655 dev_mc_sync(real_dev, dev); 3656 dev_uc_sync(real_dev, dev); 3657 } 3658 3659 static int macsec_set_mac_address(struct net_device *dev, void *p) 3660 { 3661 struct macsec_dev *macsec = macsec_priv(dev); 3662 struct net_device *real_dev = macsec->real_dev; 3663 struct sockaddr *addr = p; 3664 u8 old_addr[ETH_ALEN]; 3665 int err; 3666 3667 if (!is_valid_ether_addr(addr->sa_data)) 3668 return -EADDRNOTAVAIL; 3669 3670 if (dev->flags & IFF_UP) { 3671 err = dev_uc_add(real_dev, addr->sa_data); 3672 if (err < 0) 3673 return err; 3674 } 3675 3676 ether_addr_copy(old_addr, dev->dev_addr); 3677 eth_hw_addr_set(dev, addr->sa_data); 3678 3679 /* If h/w offloading is available, propagate to the device */ 3680 if (macsec_is_offloaded(macsec)) { 3681 const struct macsec_ops *ops; 3682 struct macsec_context ctx; 3683 3684 ops = macsec_get_ops(macsec, &ctx); 3685 if (!ops) { 3686 err = -EOPNOTSUPP; 3687 goto restore_old_addr; 3688 } 3689 3690 ctx.secy = &macsec->secy; 3691 err = macsec_offload(ops->mdo_upd_secy, &ctx); 3692 if (err) 3693 goto restore_old_addr; 3694 } 3695 3696 if (dev->flags & IFF_UP) 3697 dev_uc_del(real_dev, old_addr); 3698 3699 return 0; 3700 3701 restore_old_addr: 3702 if (dev->flags & IFF_UP) 3703 dev_uc_del(real_dev, addr->sa_data); 3704 3705 eth_hw_addr_set(dev, old_addr); 3706 3707 return err; 3708 } 3709 3710 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 3711 { 3712 struct macsec_dev *macsec = macsec_priv(dev); 3713 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 3714 3715 if (macsec->real_dev->mtu - extra < new_mtu) 3716 return -ERANGE; 3717 3718 WRITE_ONCE(dev->mtu, new_mtu); 3719 3720 return 0; 3721 } 3722 3723 static void macsec_get_stats64(struct net_device *dev, 3724 struct rtnl_link_stats64 *s) 3725 { 3726 if (!dev->tstats) 3727 return; 3728 3729 dev_fetch_sw_netstats(s, dev->tstats); 3730 3731 s->rx_dropped = DEV_STATS_READ(dev, rx_dropped); 3732 s->tx_dropped = DEV_STATS_READ(dev, tx_dropped); 3733 s->rx_errors = DEV_STATS_READ(dev, rx_errors); 3734 } 3735 3736 static int macsec_get_iflink(const struct net_device *dev) 3737 { 3738 return READ_ONCE(macsec_priv(dev)->real_dev->ifindex); 3739 } 3740 3741 static const struct net_device_ops macsec_netdev_ops = { 3742 .ndo_init = macsec_dev_init, 3743 .ndo_uninit = macsec_dev_uninit, 3744 .ndo_open = macsec_dev_open, 3745 .ndo_stop = macsec_dev_stop, 3746 .ndo_fix_features = macsec_fix_features, 3747 .ndo_change_mtu = macsec_change_mtu, 3748 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 3749 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 3750 .ndo_set_mac_address = macsec_set_mac_address, 3751 .ndo_start_xmit = macsec_start_xmit, 3752 .ndo_get_stats64 = macsec_get_stats64, 3753 .ndo_get_iflink = macsec_get_iflink, 3754 }; 3755 3756 static const struct device_type macsec_type = { 3757 .name = "macsec", 3758 }; 3759 3760 static int validate_cipher_suite(const struct nlattr *attr, 3761 struct netlink_ext_ack *extack); 3762 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 3763 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 3764 [IFLA_MACSEC_PORT] = { .type = NLA_U16 }, 3765 [IFLA_MACSEC_ICV_LEN] = NLA_POLICY_RANGE(NLA_U8, MACSEC_MIN_ICV_LEN, MACSEC_STD_ICV_LEN), 3766 [IFLA_MACSEC_CIPHER_SUITE] = NLA_POLICY_VALIDATE_FN(NLA_U64, validate_cipher_suite), 3767 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 3768 [IFLA_MACSEC_ENCODING_SA] = NLA_POLICY_MAX(NLA_U8, MACSEC_NUM_AN - 1), 3769 [IFLA_MACSEC_ENCRYPT] = NLA_POLICY_MAX(NLA_U8, 1), 3770 [IFLA_MACSEC_PROTECT] = NLA_POLICY_MAX(NLA_U8, 1), 3771 [IFLA_MACSEC_INC_SCI] = NLA_POLICY_MAX(NLA_U8, 1), 3772 [IFLA_MACSEC_ES] = NLA_POLICY_MAX(NLA_U8, 1), 3773 [IFLA_MACSEC_SCB] = NLA_POLICY_MAX(NLA_U8, 1), 3774 [IFLA_MACSEC_REPLAY_PROTECT] = NLA_POLICY_MAX(NLA_U8, 1), 3775 [IFLA_MACSEC_VALIDATION] = NLA_POLICY_MAX(NLA_U8, MACSEC_VALIDATE_MAX), 3776 [IFLA_MACSEC_OFFLOAD] = NLA_POLICY_MAX(NLA_U8, MACSEC_OFFLOAD_MAX), 3777 }; 3778 3779 static void macsec_free_netdev(struct net_device *dev) 3780 { 3781 struct macsec_dev *macsec = macsec_priv(dev); 3782 3783 dst_release(&macsec->secy.tx_sc.md_dst->dst); 3784 free_percpu(macsec->stats); 3785 free_percpu(macsec->secy.tx_sc.stats); 3786 3787 /* Get rid of the macsec's reference to real_dev */ 3788 netdev_put(macsec->real_dev, &macsec->dev_tracker); 3789 } 3790 3791 static void macsec_setup(struct net_device *dev) 3792 { 3793 ether_setup(dev); 3794 dev->min_mtu = 0; 3795 dev->max_mtu = ETH_MAX_MTU; 3796 dev->priv_flags |= IFF_NO_QUEUE | IFF_UNICAST_FLT; 3797 dev->netdev_ops = &macsec_netdev_ops; 3798 dev->needs_free_netdev = true; 3799 dev->priv_destructor = macsec_free_netdev; 3800 SET_NETDEV_DEVTYPE(dev, &macsec_type); 3801 3802 eth_zero_addr(dev->broadcast); 3803 } 3804 3805 static int macsec_changelink_common(struct net_device *dev, 3806 struct nlattr *data[]) 3807 { 3808 struct macsec_secy *secy; 3809 struct macsec_tx_sc *tx_sc; 3810 3811 secy = &macsec_priv(dev)->secy; 3812 tx_sc = &secy->tx_sc; 3813 3814 if (data[IFLA_MACSEC_ENCODING_SA]) { 3815 struct macsec_tx_sa *tx_sa; 3816 3817 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3818 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 3819 3820 secy->operational = tx_sa && tx_sa->active; 3821 } 3822 3823 if (data[IFLA_MACSEC_ENCRYPT]) 3824 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3825 3826 if (data[IFLA_MACSEC_PROTECT]) 3827 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3828 3829 if (data[IFLA_MACSEC_INC_SCI]) 3830 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3831 3832 if (data[IFLA_MACSEC_ES]) 3833 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3834 3835 if (data[IFLA_MACSEC_SCB]) 3836 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3837 3838 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3839 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3840 3841 if (data[IFLA_MACSEC_VALIDATION]) 3842 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3843 3844 if (data[IFLA_MACSEC_CIPHER_SUITE]) { 3845 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) { 3846 case MACSEC_CIPHER_ID_GCM_AES_128: 3847 case MACSEC_DEFAULT_CIPHER_ID: 3848 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3849 secy->xpn = false; 3850 break; 3851 case MACSEC_CIPHER_ID_GCM_AES_256: 3852 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3853 secy->xpn = false; 3854 break; 3855 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 3856 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3857 secy->xpn = true; 3858 break; 3859 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 3860 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3861 secy->xpn = true; 3862 break; 3863 default: 3864 return -EINVAL; 3865 } 3866 } 3867 3868 if (data[IFLA_MACSEC_WINDOW]) { 3869 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3870 3871 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window 3872 * for XPN cipher suites */ 3873 if (secy->xpn && 3874 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW) 3875 return -EINVAL; 3876 } 3877 3878 return 0; 3879 } 3880 3881 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3882 struct nlattr *data[], 3883 struct netlink_ext_ack *extack) 3884 { 3885 struct macsec_dev *macsec = macsec_priv(dev); 3886 bool macsec_offload_state_change = false; 3887 enum macsec_offload offload; 3888 struct macsec_tx_sc tx_sc; 3889 struct macsec_secy secy; 3890 int ret; 3891 3892 if (!data) 3893 return 0; 3894 3895 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3896 data[IFLA_MACSEC_ICV_LEN] || 3897 data[IFLA_MACSEC_SCI] || 3898 data[IFLA_MACSEC_PORT]) 3899 return -EINVAL; 3900 3901 /* Keep a copy of unmodified secy and tx_sc, in case the offload 3902 * propagation fails, to revert macsec_changelink_common. 3903 */ 3904 memcpy(&secy, &macsec->secy, sizeof(secy)); 3905 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc)); 3906 3907 ret = macsec_changelink_common(dev, data); 3908 if (ret) 3909 goto cleanup; 3910 3911 if (data[IFLA_MACSEC_OFFLOAD]) { 3912 offload = nla_get_u8(data[IFLA_MACSEC_OFFLOAD]); 3913 if (macsec->offload != offload) { 3914 macsec_offload_state_change = true; 3915 ret = macsec_update_offload(dev, offload); 3916 if (ret) 3917 goto cleanup; 3918 } 3919 } 3920 3921 /* If h/w offloading is available, propagate to the device */ 3922 if (!macsec_offload_state_change && macsec_is_offloaded(macsec)) { 3923 const struct macsec_ops *ops; 3924 struct macsec_context ctx; 3925 3926 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3927 if (!ops) { 3928 ret = -EOPNOTSUPP; 3929 goto cleanup; 3930 } 3931 3932 ctx.secy = &macsec->secy; 3933 ret = macsec_offload(ops->mdo_upd_secy, &ctx); 3934 if (ret) 3935 goto cleanup; 3936 } 3937 3938 return 0; 3939 3940 cleanup: 3941 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc)); 3942 memcpy(&macsec->secy, &secy, sizeof(secy)); 3943 3944 return ret; 3945 } 3946 3947 static void macsec_del_dev(struct macsec_dev *macsec) 3948 { 3949 int i; 3950 3951 while (macsec->secy.rx_sc) { 3952 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 3953 3954 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 3955 free_rx_sc(rx_sc); 3956 } 3957 3958 for (i = 0; i < MACSEC_NUM_AN; i++) { 3959 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 3960 3961 if (sa) { 3962 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 3963 clear_tx_sa(sa); 3964 } 3965 } 3966 } 3967 3968 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 3969 { 3970 struct macsec_dev *macsec = macsec_priv(dev); 3971 struct net_device *real_dev = macsec->real_dev; 3972 3973 /* If h/w offloading is available, propagate to the device */ 3974 if (macsec_is_offloaded(macsec)) { 3975 const struct macsec_ops *ops; 3976 struct macsec_context ctx; 3977 3978 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3979 if (ops) { 3980 ctx.secy = &macsec->secy; 3981 macsec_offload(ops->mdo_del_secy, &ctx); 3982 } 3983 } 3984 3985 unregister_netdevice_queue(dev, head); 3986 list_del_rcu(&macsec->secys); 3987 macsec_del_dev(macsec); 3988 netdev_upper_dev_unlink(real_dev, dev); 3989 3990 macsec_generation++; 3991 } 3992 3993 static void macsec_dellink(struct net_device *dev, struct list_head *head) 3994 { 3995 struct macsec_dev *macsec = macsec_priv(dev); 3996 struct net_device *real_dev = macsec->real_dev; 3997 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3998 3999 macsec_common_dellink(dev, head); 4000 4001 if (list_empty(&rxd->secys)) { 4002 netdev_rx_handler_unregister(real_dev); 4003 kfree(rxd); 4004 } 4005 } 4006 4007 static int register_macsec_dev(struct net_device *real_dev, 4008 struct net_device *dev) 4009 { 4010 struct macsec_dev *macsec = macsec_priv(dev); 4011 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 4012 4013 if (!rxd) { 4014 int err; 4015 4016 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 4017 if (!rxd) 4018 return -ENOMEM; 4019 4020 INIT_LIST_HEAD(&rxd->secys); 4021 4022 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 4023 rxd); 4024 if (err < 0) { 4025 kfree(rxd); 4026 return err; 4027 } 4028 } 4029 4030 list_add_tail_rcu(&macsec->secys, &rxd->secys); 4031 return 0; 4032 } 4033 4034 static bool sci_exists(struct net_device *dev, sci_t sci) 4035 { 4036 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 4037 struct macsec_dev *macsec; 4038 4039 list_for_each_entry(macsec, &rxd->secys, secys) { 4040 if (macsec->secy.sci == sci) 4041 return true; 4042 } 4043 4044 return false; 4045 } 4046 4047 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 4048 { 4049 return make_sci(dev->dev_addr, port); 4050 } 4051 4052 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 4053 { 4054 struct macsec_dev *macsec = macsec_priv(dev); 4055 struct macsec_secy *secy = &macsec->secy; 4056 4057 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 4058 if (!macsec->stats) 4059 return -ENOMEM; 4060 4061 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 4062 if (!secy->tx_sc.stats) 4063 return -ENOMEM; 4064 4065 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL); 4066 if (!secy->tx_sc.md_dst) 4067 /* macsec and secy percpu stats will be freed when unregistering 4068 * net_device in macsec_free_netdev() 4069 */ 4070 return -ENOMEM; 4071 4072 if (sci == MACSEC_UNDEF_SCI) 4073 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4074 4075 secy->netdev = dev; 4076 secy->operational = true; 4077 secy->key_len = DEFAULT_SAK_LEN; 4078 secy->icv_len = icv_len; 4079 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 4080 secy->protect_frames = true; 4081 secy->replay_protect = false; 4082 secy->xpn = DEFAULT_XPN; 4083 4084 secy->sci = sci; 4085 secy->tx_sc.md_dst->u.macsec_info.sci = sci; 4086 secy->tx_sc.active = true; 4087 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 4088 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 4089 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 4090 secy->tx_sc.end_station = false; 4091 secy->tx_sc.scb = false; 4092 4093 return 0; 4094 } 4095 4096 static struct lock_class_key macsec_netdev_addr_lock_key; 4097 4098 static int macsec_newlink(struct net_device *dev, 4099 struct rtnl_newlink_params *params, 4100 struct netlink_ext_ack *extack) 4101 { 4102 struct net *link_net = rtnl_newlink_link_net(params); 4103 struct macsec_dev *macsec = macsec_priv(dev); 4104 struct nlattr **data = params->data; 4105 struct nlattr **tb = params->tb; 4106 rx_handler_func_t *rx_handler; 4107 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4108 struct net_device *real_dev; 4109 int err, mtu; 4110 sci_t sci; 4111 4112 if (!tb[IFLA_LINK]) 4113 return -EINVAL; 4114 real_dev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK])); 4115 if (!real_dev) 4116 return -ENODEV; 4117 if (real_dev->type != ARPHRD_ETHER) 4118 return -EINVAL; 4119 4120 dev->priv_flags |= IFF_MACSEC; 4121 4122 macsec->real_dev = real_dev; 4123 4124 if (data && data[IFLA_MACSEC_OFFLOAD]) 4125 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]); 4126 else 4127 /* MACsec offloading is off by default */ 4128 macsec->offload = MACSEC_OFFLOAD_OFF; 4129 4130 /* Check if the offloading mode is supported by the underlying layers */ 4131 if (macsec->offload != MACSEC_OFFLOAD_OFF && 4132 !macsec_check_offload(macsec->offload, macsec)) 4133 return -EOPNOTSUPP; 4134 4135 /* send_sci must be set to true when transmit sci explicitly is set */ 4136 if ((data && data[IFLA_MACSEC_SCI]) && 4137 (data && data[IFLA_MACSEC_INC_SCI])) { 4138 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 4139 4140 if (!send_sci) 4141 return -EINVAL; 4142 } 4143 4144 if (data && data[IFLA_MACSEC_ICV_LEN]) 4145 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4146 mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 4147 if (mtu < 0) 4148 dev->mtu = 0; 4149 else 4150 dev->mtu = mtu; 4151 4152 rx_handler = rtnl_dereference(real_dev->rx_handler); 4153 if (rx_handler && rx_handler != macsec_handle_frame) 4154 return -EBUSY; 4155 4156 err = register_netdevice(dev); 4157 if (err < 0) 4158 return err; 4159 4160 netdev_lockdep_set_classes(dev); 4161 lockdep_set_class(&dev->addr_list_lock, 4162 &macsec_netdev_addr_lock_key); 4163 4164 err = netdev_upper_dev_link(real_dev, dev, extack); 4165 if (err < 0) 4166 goto unregister; 4167 4168 /* need to be already registered so that ->init has run and 4169 * the MAC addr is set 4170 */ 4171 if (data && data[IFLA_MACSEC_SCI]) 4172 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 4173 else if (data && data[IFLA_MACSEC_PORT]) 4174 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 4175 else 4176 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4177 4178 if (rx_handler && sci_exists(real_dev, sci)) { 4179 err = -EBUSY; 4180 goto unlink; 4181 } 4182 4183 err = macsec_add_dev(dev, sci, icv_len); 4184 if (err) 4185 goto unlink; 4186 4187 if (data) { 4188 err = macsec_changelink_common(dev, data); 4189 if (err) 4190 goto del_dev; 4191 } 4192 4193 /* If h/w offloading is available, propagate to the device */ 4194 if (macsec_is_offloaded(macsec)) { 4195 const struct macsec_ops *ops; 4196 struct macsec_context ctx; 4197 4198 ops = macsec_get_ops(macsec, &ctx); 4199 if (ops) { 4200 ctx.secy = &macsec->secy; 4201 err = macsec_offload(ops->mdo_add_secy, &ctx); 4202 if (err) 4203 goto del_dev; 4204 4205 macsec->insert_tx_tag = 4206 macsec_needs_tx_tag(macsec, ops); 4207 } 4208 } 4209 4210 err = register_macsec_dev(real_dev, dev); 4211 if (err < 0) 4212 goto del_dev; 4213 4214 netif_stacked_transfer_operstate(real_dev, dev); 4215 linkwatch_fire_event(dev); 4216 4217 macsec_generation++; 4218 4219 return 0; 4220 4221 del_dev: 4222 macsec_del_dev(macsec); 4223 unlink: 4224 netdev_upper_dev_unlink(real_dev, dev); 4225 unregister: 4226 unregister_netdevice(dev); 4227 return err; 4228 } 4229 4230 static int validate_cipher_suite(const struct nlattr *attr, 4231 struct netlink_ext_ack *extack) 4232 { 4233 switch (nla_get_u64(attr)) { 4234 case MACSEC_CIPHER_ID_GCM_AES_128: 4235 case MACSEC_CIPHER_ID_GCM_AES_256: 4236 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 4237 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 4238 case MACSEC_DEFAULT_CIPHER_ID: 4239 return 0; 4240 default: 4241 return -EINVAL; 4242 } 4243 } 4244 4245 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], 4246 struct netlink_ext_ack *extack) 4247 { 4248 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4249 bool es, scb, sci; 4250 4251 if (!data) 4252 return 0; 4253 4254 if (data[IFLA_MACSEC_ICV_LEN]) { 4255 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4256 if (icv_len != MACSEC_DEFAULT_ICV_LEN) { 4257 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 4258 struct crypto_aead *dummy_tfm; 4259 4260 dummy_tfm = macsec_alloc_tfm(dummy_key, 4261 DEFAULT_SAK_LEN, 4262 icv_len); 4263 if (IS_ERR(dummy_tfm)) 4264 return PTR_ERR(dummy_tfm); 4265 crypto_free_aead(dummy_tfm); 4266 } 4267 } 4268 4269 es = nla_get_u8_default(data[IFLA_MACSEC_ES], false); 4270 sci = nla_get_u8_default(data[IFLA_MACSEC_INC_SCI], false); 4271 scb = nla_get_u8_default(data[IFLA_MACSEC_SCB], false); 4272 4273 if ((sci && (scb || es)) || (scb && es)) 4274 return -EINVAL; 4275 4276 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 4277 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 4278 !data[IFLA_MACSEC_WINDOW]) 4279 return -EINVAL; 4280 4281 return 0; 4282 } 4283 4284 static struct net *macsec_get_link_net(const struct net_device *dev) 4285 { 4286 return dev_net(macsec_priv(dev)->real_dev); 4287 } 4288 4289 struct net_device *macsec_get_real_dev(const struct net_device *dev) 4290 { 4291 return macsec_priv(dev)->real_dev; 4292 } 4293 EXPORT_SYMBOL_GPL(macsec_get_real_dev); 4294 4295 bool macsec_netdev_is_offloaded(struct net_device *dev) 4296 { 4297 return macsec_is_offloaded(macsec_priv(dev)); 4298 } 4299 EXPORT_SYMBOL_GPL(macsec_netdev_is_offloaded); 4300 4301 static size_t macsec_get_size(const struct net_device *dev) 4302 { 4303 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ 4304 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ 4305 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ 4306 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ 4307 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ 4308 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ 4309 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ 4310 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ 4311 nla_total_size(1) + /* IFLA_MACSEC_ES */ 4312 nla_total_size(1) + /* IFLA_MACSEC_SCB */ 4313 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ 4314 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ 4315 nla_total_size(1) + /* IFLA_MACSEC_OFFLOAD */ 4316 0; 4317 } 4318 4319 static int macsec_fill_info(struct sk_buff *skb, 4320 const struct net_device *dev) 4321 { 4322 struct macsec_tx_sc *tx_sc; 4323 struct macsec_dev *macsec; 4324 struct macsec_secy *secy; 4325 u64 csid; 4326 4327 macsec = macsec_priv(dev); 4328 secy = &macsec->secy; 4329 tx_sc = &secy->tx_sc; 4330 4331 switch (secy->key_len) { 4332 case MACSEC_GCM_AES_128_SAK_LEN: 4333 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 4334 break; 4335 case MACSEC_GCM_AES_256_SAK_LEN: 4336 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 4337 break; 4338 default: 4339 goto nla_put_failure; 4340 } 4341 4342 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 4343 IFLA_MACSEC_PAD) || 4344 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 4345 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 4346 csid, IFLA_MACSEC_PAD) || 4347 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 4348 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 4349 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 4350 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 4351 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 4352 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 4353 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 4354 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 4355 nla_put_u8(skb, IFLA_MACSEC_OFFLOAD, macsec->offload) || 4356 0) 4357 goto nla_put_failure; 4358 4359 if (secy->replay_protect) { 4360 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 4361 goto nla_put_failure; 4362 } 4363 4364 return 0; 4365 4366 nla_put_failure: 4367 return -EMSGSIZE; 4368 } 4369 4370 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 4371 .kind = "macsec", 4372 .priv_size = sizeof(struct macsec_dev), 4373 .maxtype = IFLA_MACSEC_MAX, 4374 .policy = macsec_rtnl_policy, 4375 .setup = macsec_setup, 4376 .validate = macsec_validate_attr, 4377 .newlink = macsec_newlink, 4378 .changelink = macsec_changelink, 4379 .dellink = macsec_dellink, 4380 .get_size = macsec_get_size, 4381 .fill_info = macsec_fill_info, 4382 .get_link_net = macsec_get_link_net, 4383 }; 4384 4385 static bool is_macsec_master(struct net_device *dev) 4386 { 4387 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 4388 } 4389 4390 static int macsec_notify(struct notifier_block *this, unsigned long event, 4391 void *ptr) 4392 { 4393 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 4394 struct macsec_rxh_data *rxd; 4395 struct macsec_dev *m, *n; 4396 LIST_HEAD(head); 4397 4398 if (!is_macsec_master(real_dev)) 4399 return NOTIFY_DONE; 4400 4401 rxd = macsec_data_rtnl(real_dev); 4402 4403 switch (event) { 4404 case NETDEV_DOWN: 4405 case NETDEV_UP: 4406 case NETDEV_CHANGE: 4407 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4408 struct net_device *dev = m->secy.netdev; 4409 4410 netif_stacked_transfer_operstate(real_dev, dev); 4411 } 4412 break; 4413 case NETDEV_UNREGISTER: 4414 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4415 macsec_common_dellink(m->secy.netdev, &head); 4416 } 4417 4418 netdev_rx_handler_unregister(real_dev); 4419 kfree(rxd); 4420 4421 unregister_netdevice_many(&head); 4422 break; 4423 case NETDEV_CHANGEMTU: 4424 list_for_each_entry(m, &rxd->secys, secys) { 4425 struct net_device *dev = m->secy.netdev; 4426 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 4427 macsec_extra_len(true)); 4428 4429 if (dev->mtu > mtu) 4430 dev_set_mtu(dev, mtu); 4431 } 4432 break; 4433 case NETDEV_FEAT_CHANGE: 4434 list_for_each_entry(m, &rxd->secys, secys) { 4435 macsec_inherit_tso_max(m->secy.netdev); 4436 netdev_update_features(m->secy.netdev); 4437 } 4438 break; 4439 } 4440 4441 return NOTIFY_OK; 4442 } 4443 4444 static struct notifier_block macsec_notifier = { 4445 .notifier_call = macsec_notify, 4446 }; 4447 4448 static int __init macsec_init(void) 4449 { 4450 int err; 4451 4452 pr_info("MACsec IEEE 802.1AE\n"); 4453 err = register_netdevice_notifier(&macsec_notifier); 4454 if (err) 4455 return err; 4456 4457 err = rtnl_link_register(&macsec_link_ops); 4458 if (err) 4459 goto notifier; 4460 4461 err = genl_register_family(&macsec_fam); 4462 if (err) 4463 goto rtnl; 4464 4465 return 0; 4466 4467 rtnl: 4468 rtnl_link_unregister(&macsec_link_ops); 4469 notifier: 4470 unregister_netdevice_notifier(&macsec_notifier); 4471 return err; 4472 } 4473 4474 static void __exit macsec_exit(void) 4475 { 4476 genl_unregister_family(&macsec_fam); 4477 rtnl_link_unregister(&macsec_link_ops); 4478 unregister_netdevice_notifier(&macsec_notifier); 4479 rcu_barrier(); 4480 } 4481 4482 module_init(macsec_init); 4483 module_exit(macsec_exit); 4484 4485 MODULE_ALIAS_RTNL_LINK("macsec"); 4486 MODULE_ALIAS_GENL_FAMILY("macsec"); 4487 4488 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 4489 MODULE_LICENSE("GPL v2"); 4490