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