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 <linux/phy.h> 22 #include <linux/byteorder/generic.h> 23 #include <linux/if_arp.h> 24 25 #include <uapi/linux/if_macsec.h> 26 27 #define MACSEC_SCI_LEN 8 28 29 /* SecTAG length = macsec_eth_header without the optional SCI */ 30 #define MACSEC_TAG_LEN 6 31 32 struct macsec_eth_header { 33 struct ethhdr eth; 34 /* SecTAG */ 35 u8 tci_an; 36 #if defined(__LITTLE_ENDIAN_BITFIELD) 37 u8 short_length:6, 38 unused:2; 39 #elif defined(__BIG_ENDIAN_BITFIELD) 40 u8 unused:2, 41 short_length:6; 42 #else 43 #error "Please fix <asm/byteorder.h>" 44 #endif 45 __be32 packet_number; 46 u8 secure_channel_id[8]; /* optional */ 47 } __packed; 48 49 #define MACSEC_TCI_VERSION 0x80 50 #define MACSEC_TCI_ES 0x40 /* end station */ 51 #define MACSEC_TCI_SC 0x20 /* SCI present */ 52 #define MACSEC_TCI_SCB 0x10 /* epon */ 53 #define MACSEC_TCI_E 0x08 /* encryption */ 54 #define MACSEC_TCI_C 0x04 /* changed text */ 55 #define MACSEC_AN_MASK 0x03 /* association number */ 56 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C) 57 58 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */ 59 #define MIN_NON_SHORT_LEN 48 60 61 #define GCM_AES_IV_LEN 12 62 #define DEFAULT_ICV_LEN 16 63 64 #define for_each_rxsc(secy, sc) \ 65 for (sc = rcu_dereference_bh(secy->rx_sc); \ 66 sc; \ 67 sc = rcu_dereference_bh(sc->next)) 68 #define for_each_rxsc_rtnl(secy, sc) \ 69 for (sc = rtnl_dereference(secy->rx_sc); \ 70 sc; \ 71 sc = rtnl_dereference(sc->next)) 72 73 #define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31))) 74 75 struct gcm_iv_xpn { 76 union { 77 u8 short_secure_channel_id[4]; 78 ssci_t ssci; 79 }; 80 __be64 pn; 81 } __packed; 82 83 struct gcm_iv { 84 union { 85 u8 secure_channel_id[8]; 86 sci_t sci; 87 }; 88 __be32 pn; 89 }; 90 91 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT 92 93 struct pcpu_secy_stats { 94 struct macsec_dev_stats stats; 95 struct u64_stats_sync syncp; 96 }; 97 98 /** 99 * struct macsec_dev - private data 100 * @secy: SecY config 101 * @real_dev: pointer to underlying netdevice 102 * @stats: MACsec device stats 103 * @secys: linked list of SecY's on the underlying device 104 * @gro_cells: pointer to the Generic Receive Offload cell 105 * @offload: status of offloading on the MACsec device 106 */ 107 struct macsec_dev { 108 struct macsec_secy secy; 109 struct net_device *real_dev; 110 struct pcpu_secy_stats __percpu *stats; 111 struct list_head secys; 112 struct gro_cells gro_cells; 113 enum macsec_offload offload; 114 }; 115 116 /** 117 * struct macsec_rxh_data - rx_handler private argument 118 * @secys: linked list of SecY's on this underlying device 119 */ 120 struct macsec_rxh_data { 121 struct list_head secys; 122 }; 123 124 static struct macsec_dev *macsec_priv(const struct net_device *dev) 125 { 126 return (struct macsec_dev *)netdev_priv(dev); 127 } 128 129 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev) 130 { 131 return rcu_dereference_bh(dev->rx_handler_data); 132 } 133 134 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev) 135 { 136 return rtnl_dereference(dev->rx_handler_data); 137 } 138 139 struct macsec_cb { 140 struct aead_request *req; 141 union { 142 struct macsec_tx_sa *tx_sa; 143 struct macsec_rx_sa *rx_sa; 144 }; 145 u8 assoc_num; 146 bool valid; 147 bool has_sci; 148 }; 149 150 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr) 151 { 152 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr); 153 154 if (!sa || !sa->active) 155 return NULL; 156 157 if (!refcount_inc_not_zero(&sa->refcnt)) 158 return NULL; 159 160 return sa; 161 } 162 163 static void free_rx_sc_rcu(struct rcu_head *head) 164 { 165 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head); 166 167 free_percpu(rx_sc->stats); 168 kfree(rx_sc); 169 } 170 171 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc) 172 { 173 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL; 174 } 175 176 static void macsec_rxsc_put(struct macsec_rx_sc *sc) 177 { 178 if (refcount_dec_and_test(&sc->refcnt)) 179 call_rcu(&sc->rcu_head, free_rx_sc_rcu); 180 } 181 182 static void free_rxsa(struct rcu_head *head) 183 { 184 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu); 185 186 crypto_free_aead(sa->key.tfm); 187 free_percpu(sa->stats); 188 kfree(sa); 189 } 190 191 static void macsec_rxsa_put(struct macsec_rx_sa *sa) 192 { 193 if (refcount_dec_and_test(&sa->refcnt)) 194 call_rcu(&sa->rcu, free_rxsa); 195 } 196 197 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr) 198 { 199 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr); 200 201 if (!sa || !sa->active) 202 return NULL; 203 204 if (!refcount_inc_not_zero(&sa->refcnt)) 205 return NULL; 206 207 return sa; 208 } 209 210 static void free_txsa(struct rcu_head *head) 211 { 212 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu); 213 214 crypto_free_aead(sa->key.tfm); 215 free_percpu(sa->stats); 216 kfree(sa); 217 } 218 219 static void macsec_txsa_put(struct macsec_tx_sa *sa) 220 { 221 if (refcount_dec_and_test(&sa->refcnt)) 222 call_rcu(&sa->rcu, free_txsa); 223 } 224 225 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) 226 { 227 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); 228 return (struct macsec_cb *)skb->cb; 229 } 230 231 #define MACSEC_PORT_ES (htons(0x0001)) 232 #define MACSEC_PORT_SCB (0x0000) 233 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL) 234 #define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff) 235 236 #define MACSEC_GCM_AES_128_SAK_LEN 16 237 #define MACSEC_GCM_AES_256_SAK_LEN 32 238 239 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN 240 #define DEFAULT_XPN false 241 #define DEFAULT_SEND_SCI true 242 #define DEFAULT_ENCRYPT false 243 #define DEFAULT_ENCODING_SA 0 244 245 static bool send_sci(const struct macsec_secy *secy) 246 { 247 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 248 249 return tx_sc->send_sci || 250 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb); 251 } 252 253 static sci_t make_sci(const u8 *addr, __be16 port) 254 { 255 sci_t sci; 256 257 memcpy(&sci, addr, ETH_ALEN); 258 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); 259 260 return sci; 261 } 262 263 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present) 264 { 265 sci_t sci; 266 267 if (sci_present) 268 memcpy(&sci, hdr->secure_channel_id, 269 sizeof(hdr->secure_channel_id)); 270 else 271 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); 272 273 return sci; 274 } 275 276 static unsigned int macsec_sectag_len(bool sci_present) 277 { 278 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); 279 } 280 281 static unsigned int macsec_hdr_len(bool sci_present) 282 { 283 return macsec_sectag_len(sci_present) + ETH_HLEN; 284 } 285 286 static unsigned int macsec_extra_len(bool sci_present) 287 { 288 return macsec_sectag_len(sci_present) + sizeof(__be16); 289 } 290 291 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ 292 static void macsec_fill_sectag(struct macsec_eth_header *h, 293 const struct macsec_secy *secy, u32 pn, 294 bool sci_present) 295 { 296 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 297 298 memset(&h->tci_an, 0, macsec_sectag_len(sci_present)); 299 h->eth.h_proto = htons(ETH_P_MACSEC); 300 301 if (sci_present) { 302 h->tci_an |= MACSEC_TCI_SC; 303 memcpy(&h->secure_channel_id, &secy->sci, 304 sizeof(h->secure_channel_id)); 305 } else { 306 if (tx_sc->end_station) 307 h->tci_an |= MACSEC_TCI_ES; 308 if (tx_sc->scb) 309 h->tci_an |= MACSEC_TCI_SCB; 310 } 311 312 h->packet_number = htonl(pn); 313 314 /* with GCM, C/E clear for !encrypt, both set for encrypt */ 315 if (tx_sc->encrypt) 316 h->tci_an |= MACSEC_TCI_CONFID; 317 else if (secy->icv_len != DEFAULT_ICV_LEN) 318 h->tci_an |= MACSEC_TCI_C; 319 320 h->tci_an |= tx_sc->encoding_sa; 321 } 322 323 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) 324 { 325 if (data_len < MIN_NON_SHORT_LEN) 326 h->short_length = data_len; 327 } 328 329 /* Checks if a MACsec interface is being offloaded to an hardware engine */ 330 static bool macsec_is_offloaded(struct macsec_dev *macsec) 331 { 332 if (macsec->offload == MACSEC_OFFLOAD_MAC || 333 macsec->offload == MACSEC_OFFLOAD_PHY) 334 return true; 335 336 return false; 337 } 338 339 /* Checks if underlying layers implement MACsec offloading functions. */ 340 static bool macsec_check_offload(enum macsec_offload offload, 341 struct macsec_dev *macsec) 342 { 343 if (!macsec || !macsec->real_dev) 344 return false; 345 346 if (offload == MACSEC_OFFLOAD_PHY) 347 return macsec->real_dev->phydev && 348 macsec->real_dev->phydev->macsec_ops; 349 else if (offload == MACSEC_OFFLOAD_MAC) 350 return macsec->real_dev->features & NETIF_F_HW_MACSEC && 351 macsec->real_dev->macsec_ops; 352 353 return false; 354 } 355 356 static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload, 357 struct macsec_dev *macsec, 358 struct macsec_context *ctx) 359 { 360 if (ctx) { 361 memset(ctx, 0, sizeof(*ctx)); 362 ctx->offload = offload; 363 364 if (offload == MACSEC_OFFLOAD_PHY) 365 ctx->phydev = macsec->real_dev->phydev; 366 else if (offload == MACSEC_OFFLOAD_MAC) 367 ctx->netdev = macsec->real_dev; 368 } 369 370 if (offload == MACSEC_OFFLOAD_PHY) 371 return macsec->real_dev->phydev->macsec_ops; 372 else 373 return macsec->real_dev->macsec_ops; 374 } 375 376 /* Returns a pointer to the MACsec ops struct if any and updates the MACsec 377 * context device reference if provided. 378 */ 379 static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec, 380 struct macsec_context *ctx) 381 { 382 if (!macsec_check_offload(macsec->offload, macsec)) 383 return NULL; 384 385 return __macsec_get_ops(macsec->offload, macsec, ctx); 386 } 387 388 /* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */ 389 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn) 390 { 391 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; 392 int len = skb->len - 2 * ETH_ALEN; 393 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; 394 395 /* a) It comprises at least 17 octets */ 396 if (skb->len <= 16) 397 return false; 398 399 /* b) MACsec EtherType: already checked */ 400 401 /* c) V bit is clear */ 402 if (h->tci_an & MACSEC_TCI_VERSION) 403 return false; 404 405 /* d) ES or SCB => !SC */ 406 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && 407 (h->tci_an & MACSEC_TCI_SC)) 408 return false; 409 410 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ 411 if (h->unused) 412 return false; 413 414 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */ 415 if (!h->packet_number && !xpn) 416 return false; 417 418 /* length check, f) g) h) i) */ 419 if (h->short_length) 420 return len == extra_len + h->short_length; 421 return len >= extra_len + MIN_NON_SHORT_LEN; 422 } 423 424 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) 425 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN 426 427 static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn, 428 salt_t salt) 429 { 430 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv; 431 432 gcm_iv->ssci = ssci ^ salt.ssci; 433 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn; 434 } 435 436 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) 437 { 438 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; 439 440 gcm_iv->sci = sci; 441 gcm_iv->pn = htonl(pn); 442 } 443 444 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) 445 { 446 return (struct macsec_eth_header *)skb_mac_header(skb); 447 } 448 449 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 450 { 451 return make_sci(dev->dev_addr, port); 452 } 453 454 static void __macsec_pn_wrapped(struct macsec_secy *secy, 455 struct macsec_tx_sa *tx_sa) 456 { 457 pr_debug("PN wrapped, transitioning to !oper\n"); 458 tx_sa->active = false; 459 if (secy->protect_frames) 460 secy->operational = false; 461 } 462 463 void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa) 464 { 465 spin_lock_bh(&tx_sa->lock); 466 __macsec_pn_wrapped(secy, tx_sa); 467 spin_unlock_bh(&tx_sa->lock); 468 } 469 EXPORT_SYMBOL_GPL(macsec_pn_wrapped); 470 471 static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa, 472 struct macsec_secy *secy) 473 { 474 pn_t pn; 475 476 spin_lock_bh(&tx_sa->lock); 477 478 pn = tx_sa->next_pn_halves; 479 if (secy->xpn) 480 tx_sa->next_pn++; 481 else 482 tx_sa->next_pn_halves.lower++; 483 484 if (tx_sa->next_pn == 0) 485 __macsec_pn_wrapped(secy, tx_sa); 486 spin_unlock_bh(&tx_sa->lock); 487 488 return pn; 489 } 490 491 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) 492 { 493 struct macsec_dev *macsec = netdev_priv(dev); 494 495 skb->dev = macsec->real_dev; 496 skb_reset_mac_header(skb); 497 skb->protocol = eth_hdr(skb)->h_proto; 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 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); 504 505 u64_stats_update_begin(&txsc_stats->syncp); 506 if (tx_sc->encrypt) { 507 txsc_stats->stats.OutOctetsEncrypted += skb->len; 508 txsc_stats->stats.OutPktsEncrypted++; 509 this_cpu_inc(tx_sa->stats->OutPktsEncrypted); 510 } else { 511 txsc_stats->stats.OutOctetsProtected += skb->len; 512 txsc_stats->stats.OutPktsProtected++; 513 this_cpu_inc(tx_sa->stats->OutPktsProtected); 514 } 515 u64_stats_update_end(&txsc_stats->syncp); 516 } 517 518 static void count_tx(struct net_device *dev, int ret, int len) 519 { 520 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 521 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 522 523 u64_stats_update_begin(&stats->syncp); 524 stats->tx_packets++; 525 stats->tx_bytes += len; 526 u64_stats_update_end(&stats->syncp); 527 } 528 } 529 530 static void macsec_encrypt_done(struct crypto_async_request *base, int err) 531 { 532 struct sk_buff *skb = base->data; 533 struct net_device *dev = skb->dev; 534 struct macsec_dev *macsec = macsec_priv(dev); 535 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 536 int len, ret; 537 538 aead_request_free(macsec_skb_cb(skb)->req); 539 540 rcu_read_lock_bh(); 541 macsec_encrypt_finish(skb, dev); 542 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 543 len = skb->len; 544 ret = dev_queue_xmit(skb); 545 count_tx(dev, ret, len); 546 rcu_read_unlock_bh(); 547 548 macsec_txsa_put(sa); 549 dev_put(dev); 550 } 551 552 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, 553 unsigned char **iv, 554 struct scatterlist **sg, 555 int num_frags) 556 { 557 size_t size, iv_offset, sg_offset; 558 struct aead_request *req; 559 void *tmp; 560 561 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); 562 iv_offset = size; 563 size += GCM_AES_IV_LEN; 564 565 size = ALIGN(size, __alignof__(struct scatterlist)); 566 sg_offset = size; 567 size += sizeof(struct scatterlist) * num_frags; 568 569 tmp = kmalloc(size, GFP_ATOMIC); 570 if (!tmp) 571 return NULL; 572 573 *iv = (unsigned char *)(tmp + iv_offset); 574 *sg = (struct scatterlist *)(tmp + sg_offset); 575 req = tmp; 576 577 aead_request_set_tfm(req, tfm); 578 579 return req; 580 } 581 582 static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 583 struct net_device *dev) 584 { 585 int ret; 586 struct scatterlist *sg; 587 struct sk_buff *trailer; 588 unsigned char *iv; 589 struct ethhdr *eth; 590 struct macsec_eth_header *hh; 591 size_t unprotected_len; 592 struct aead_request *req; 593 struct macsec_secy *secy; 594 struct macsec_tx_sc *tx_sc; 595 struct macsec_tx_sa *tx_sa; 596 struct macsec_dev *macsec = macsec_priv(dev); 597 bool sci_present; 598 pn_t pn; 599 600 secy = &macsec->secy; 601 tx_sc = &secy->tx_sc; 602 603 /* 10.5.1 TX SA assignment */ 604 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); 605 if (!tx_sa) { 606 secy->operational = false; 607 kfree_skb(skb); 608 return ERR_PTR(-EINVAL); 609 } 610 611 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || 612 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { 613 struct sk_buff *nskb = skb_copy_expand(skb, 614 MACSEC_NEEDED_HEADROOM, 615 MACSEC_NEEDED_TAILROOM, 616 GFP_ATOMIC); 617 if (likely(nskb)) { 618 consume_skb(skb); 619 skb = nskb; 620 } else { 621 macsec_txsa_put(tx_sa); 622 kfree_skb(skb); 623 return ERR_PTR(-ENOMEM); 624 } 625 } else { 626 skb = skb_unshare(skb, GFP_ATOMIC); 627 if (!skb) { 628 macsec_txsa_put(tx_sa); 629 return ERR_PTR(-ENOMEM); 630 } 631 } 632 633 unprotected_len = skb->len; 634 eth = eth_hdr(skb); 635 sci_present = send_sci(secy); 636 hh = skb_push(skb, macsec_extra_len(sci_present)); 637 memmove(hh, eth, 2 * ETH_ALEN); 638 639 pn = tx_sa_update_pn(tx_sa, secy); 640 if (pn.full64 == 0) { 641 macsec_txsa_put(tx_sa); 642 kfree_skb(skb); 643 return ERR_PTR(-ENOLINK); 644 } 645 macsec_fill_sectag(hh, secy, pn.lower, sci_present); 646 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); 647 648 skb_put(skb, secy->icv_len); 649 650 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { 651 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 652 653 u64_stats_update_begin(&secy_stats->syncp); 654 secy_stats->stats.OutPktsTooLong++; 655 u64_stats_update_end(&secy_stats->syncp); 656 657 macsec_txsa_put(tx_sa); 658 kfree_skb(skb); 659 return ERR_PTR(-EINVAL); 660 } 661 662 ret = skb_cow_data(skb, 0, &trailer); 663 if (unlikely(ret < 0)) { 664 macsec_txsa_put(tx_sa); 665 kfree_skb(skb); 666 return ERR_PTR(ret); 667 } 668 669 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret); 670 if (!req) { 671 macsec_txsa_put(tx_sa); 672 kfree_skb(skb); 673 return ERR_PTR(-ENOMEM); 674 } 675 676 if (secy->xpn) 677 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt); 678 else 679 macsec_fill_iv(iv, secy->sci, pn.lower); 680 681 sg_init_table(sg, ret); 682 ret = skb_to_sgvec(skb, sg, 0, skb->len); 683 if (unlikely(ret < 0)) { 684 aead_request_free(req); 685 macsec_txsa_put(tx_sa); 686 kfree_skb(skb); 687 return ERR_PTR(ret); 688 } 689 690 if (tx_sc->encrypt) { 691 int len = skb->len - macsec_hdr_len(sci_present) - 692 secy->icv_len; 693 aead_request_set_crypt(req, sg, sg, len, iv); 694 aead_request_set_ad(req, macsec_hdr_len(sci_present)); 695 } else { 696 aead_request_set_crypt(req, sg, sg, 0, iv); 697 aead_request_set_ad(req, skb->len - secy->icv_len); 698 } 699 700 macsec_skb_cb(skb)->req = req; 701 macsec_skb_cb(skb)->tx_sa = tx_sa; 702 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 703 704 dev_hold(skb->dev); 705 ret = crypto_aead_encrypt(req); 706 if (ret == -EINPROGRESS) { 707 return ERR_PTR(ret); 708 } else if (ret != 0) { 709 dev_put(skb->dev); 710 kfree_skb(skb); 711 aead_request_free(req); 712 macsec_txsa_put(tx_sa); 713 return ERR_PTR(-EINVAL); 714 } 715 716 dev_put(skb->dev); 717 aead_request_free(req); 718 macsec_txsa_put(tx_sa); 719 720 return skb; 721 } 722 723 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 724 { 725 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 726 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 727 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 728 u32 lowest_pn = 0; 729 730 spin_lock(&rx_sa->lock); 731 if (rx_sa->next_pn_halves.lower >= secy->replay_window) 732 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window; 733 734 /* Now perform replay protection check again 735 * (see IEEE 802.1AE-2006 figure 10-5) 736 */ 737 if (secy->replay_protect && pn < lowest_pn && 738 (!secy->xpn || pn_same_half(pn, lowest_pn))) { 739 spin_unlock(&rx_sa->lock); 740 u64_stats_update_begin(&rxsc_stats->syncp); 741 rxsc_stats->stats.InPktsLate++; 742 u64_stats_update_end(&rxsc_stats->syncp); 743 return false; 744 } 745 746 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 747 u64_stats_update_begin(&rxsc_stats->syncp); 748 if (hdr->tci_an & MACSEC_TCI_E) 749 rxsc_stats->stats.InOctetsDecrypted += skb->len; 750 else 751 rxsc_stats->stats.InOctetsValidated += skb->len; 752 u64_stats_update_end(&rxsc_stats->syncp); 753 } 754 755 if (!macsec_skb_cb(skb)->valid) { 756 spin_unlock(&rx_sa->lock); 757 758 /* 10.6.5 */ 759 if (hdr->tci_an & MACSEC_TCI_C || 760 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 761 u64_stats_update_begin(&rxsc_stats->syncp); 762 rxsc_stats->stats.InPktsNotValid++; 763 u64_stats_update_end(&rxsc_stats->syncp); 764 return false; 765 } 766 767 u64_stats_update_begin(&rxsc_stats->syncp); 768 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 769 rxsc_stats->stats.InPktsInvalid++; 770 this_cpu_inc(rx_sa->stats->InPktsInvalid); 771 } else if (pn < lowest_pn) { 772 rxsc_stats->stats.InPktsDelayed++; 773 } else { 774 rxsc_stats->stats.InPktsUnchecked++; 775 } 776 u64_stats_update_end(&rxsc_stats->syncp); 777 } else { 778 u64_stats_update_begin(&rxsc_stats->syncp); 779 if (pn < lowest_pn) { 780 rxsc_stats->stats.InPktsDelayed++; 781 } else { 782 rxsc_stats->stats.InPktsOK++; 783 this_cpu_inc(rx_sa->stats->InPktsOK); 784 } 785 u64_stats_update_end(&rxsc_stats->syncp); 786 787 // Instead of "pn >=" - to support pn overflow in xpn 788 if (pn + 1 > rx_sa->next_pn_halves.lower) { 789 rx_sa->next_pn_halves.lower = pn + 1; 790 } else if (secy->xpn && 791 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) { 792 rx_sa->next_pn_halves.upper++; 793 rx_sa->next_pn_halves.lower = pn + 1; 794 } 795 796 spin_unlock(&rx_sa->lock); 797 } 798 799 return true; 800 } 801 802 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 803 { 804 skb->pkt_type = PACKET_HOST; 805 skb->protocol = eth_type_trans(skb, dev); 806 807 skb_reset_network_header(skb); 808 if (!skb_transport_header_was_set(skb)) 809 skb_reset_transport_header(skb); 810 skb_reset_mac_len(skb); 811 } 812 813 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 814 { 815 skb->ip_summed = CHECKSUM_NONE; 816 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 817 skb_pull(skb, hdr_len); 818 pskb_trim_unique(skb, skb->len - icv_len); 819 } 820 821 static void count_rx(struct net_device *dev, int len) 822 { 823 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 824 825 u64_stats_update_begin(&stats->syncp); 826 stats->rx_packets++; 827 stats->rx_bytes += len; 828 u64_stats_update_end(&stats->syncp); 829 } 830 831 static void macsec_decrypt_done(struct crypto_async_request *base, int err) 832 { 833 struct sk_buff *skb = base->data; 834 struct net_device *dev = skb->dev; 835 struct macsec_dev *macsec = macsec_priv(dev); 836 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 837 struct macsec_rx_sc *rx_sc = rx_sa->sc; 838 int len; 839 u32 pn; 840 841 aead_request_free(macsec_skb_cb(skb)->req); 842 843 if (!err) 844 macsec_skb_cb(skb)->valid = true; 845 846 rcu_read_lock_bh(); 847 pn = ntohl(macsec_ethhdr(skb)->packet_number); 848 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 849 rcu_read_unlock_bh(); 850 kfree_skb(skb); 851 goto out; 852 } 853 854 macsec_finalize_skb(skb, macsec->secy.icv_len, 855 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 856 macsec_reset_skb(skb, macsec->secy.netdev); 857 858 len = skb->len; 859 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS) 860 count_rx(dev, len); 861 862 rcu_read_unlock_bh(); 863 864 out: 865 macsec_rxsa_put(rx_sa); 866 macsec_rxsc_put(rx_sc); 867 dev_put(dev); 868 } 869 870 static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 871 struct net_device *dev, 872 struct macsec_rx_sa *rx_sa, 873 sci_t sci, 874 struct macsec_secy *secy) 875 { 876 int ret; 877 struct scatterlist *sg; 878 struct sk_buff *trailer; 879 unsigned char *iv; 880 struct aead_request *req; 881 struct macsec_eth_header *hdr; 882 u32 hdr_pn; 883 u16 icv_len = secy->icv_len; 884 885 macsec_skb_cb(skb)->valid = false; 886 skb = skb_share_check(skb, GFP_ATOMIC); 887 if (!skb) 888 return ERR_PTR(-ENOMEM); 889 890 ret = skb_cow_data(skb, 0, &trailer); 891 if (unlikely(ret < 0)) { 892 kfree_skb(skb); 893 return ERR_PTR(ret); 894 } 895 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret); 896 if (!req) { 897 kfree_skb(skb); 898 return ERR_PTR(-ENOMEM); 899 } 900 901 hdr = (struct macsec_eth_header *)skb->data; 902 hdr_pn = ntohl(hdr->packet_number); 903 904 if (secy->xpn) { 905 pn_t recovered_pn = rx_sa->next_pn_halves; 906 907 recovered_pn.lower = hdr_pn; 908 if (hdr_pn < rx_sa->next_pn_halves.lower && 909 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower)) 910 recovered_pn.upper++; 911 912 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64, 913 rx_sa->key.salt); 914 } else { 915 macsec_fill_iv(iv, sci, hdr_pn); 916 } 917 918 sg_init_table(sg, ret); 919 ret = skb_to_sgvec(skb, sg, 0, skb->len); 920 if (unlikely(ret < 0)) { 921 aead_request_free(req); 922 kfree_skb(skb); 923 return ERR_PTR(ret); 924 } 925 926 if (hdr->tci_an & MACSEC_TCI_E) { 927 /* confidentiality: ethernet + macsec header 928 * authenticated, encrypted payload 929 */ 930 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 931 932 aead_request_set_crypt(req, sg, sg, len, iv); 933 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 934 skb = skb_unshare(skb, GFP_ATOMIC); 935 if (!skb) { 936 aead_request_free(req); 937 return ERR_PTR(-ENOMEM); 938 } 939 } else { 940 /* integrity only: all headers + data authenticated */ 941 aead_request_set_crypt(req, sg, sg, icv_len, iv); 942 aead_request_set_ad(req, skb->len - icv_len); 943 } 944 945 macsec_skb_cb(skb)->req = req; 946 skb->dev = dev; 947 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 948 949 dev_hold(dev); 950 ret = crypto_aead_decrypt(req); 951 if (ret == -EINPROGRESS) { 952 return ERR_PTR(ret); 953 } else if (ret != 0) { 954 /* decryption/authentication failed 955 * 10.6 if validateFrames is disabled, deliver anyway 956 */ 957 if (ret != -EBADMSG) { 958 kfree_skb(skb); 959 skb = ERR_PTR(ret); 960 } 961 } else { 962 macsec_skb_cb(skb)->valid = true; 963 } 964 dev_put(dev); 965 966 aead_request_free(req); 967 968 return skb; 969 } 970 971 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 972 { 973 struct macsec_rx_sc *rx_sc; 974 975 for_each_rxsc(secy, rx_sc) { 976 if (rx_sc->sci == sci) 977 return rx_sc; 978 } 979 980 return NULL; 981 } 982 983 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 984 { 985 struct macsec_rx_sc *rx_sc; 986 987 for_each_rxsc_rtnl(secy, rx_sc) { 988 if (rx_sc->sci == sci) 989 return rx_sc; 990 } 991 992 return NULL; 993 } 994 995 static enum rx_handler_result handle_not_macsec(struct sk_buff *skb) 996 { 997 /* Deliver to the uncontrolled port by default */ 998 enum rx_handler_result ret = RX_HANDLER_PASS; 999 struct ethhdr *hdr = eth_hdr(skb); 1000 struct macsec_rxh_data *rxd; 1001 struct macsec_dev *macsec; 1002 1003 rcu_read_lock(); 1004 rxd = macsec_data_rcu(skb->dev); 1005 1006 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1007 struct sk_buff *nskb; 1008 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 1009 struct net_device *ndev = macsec->secy.netdev; 1010 1011 /* If h/w offloading is enabled, HW decodes frames and strips 1012 * the SecTAG, so we have to deduce which port to deliver to. 1013 */ 1014 if (macsec_is_offloaded(macsec) && netif_running(ndev)) { 1015 if (ether_addr_equal_64bits(hdr->h_dest, 1016 ndev->dev_addr)) { 1017 /* exact match, divert skb to this port */ 1018 skb->dev = ndev; 1019 skb->pkt_type = PACKET_HOST; 1020 ret = RX_HANDLER_ANOTHER; 1021 goto out; 1022 } else if (is_multicast_ether_addr_64bits( 1023 hdr->h_dest)) { 1024 /* multicast frame, deliver on this port too */ 1025 nskb = skb_clone(skb, GFP_ATOMIC); 1026 if (!nskb) 1027 break; 1028 1029 nskb->dev = ndev; 1030 if (ether_addr_equal_64bits(hdr->h_dest, 1031 ndev->broadcast)) 1032 nskb->pkt_type = PACKET_BROADCAST; 1033 else 1034 nskb->pkt_type = PACKET_MULTICAST; 1035 1036 netif_rx(nskb); 1037 } 1038 continue; 1039 } 1040 1041 /* 10.6 If the management control validateFrames is not 1042 * Strict, frames without a SecTAG are received, counted, and 1043 * delivered to the Controlled Port 1044 */ 1045 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1046 u64_stats_update_begin(&secy_stats->syncp); 1047 secy_stats->stats.InPktsNoTag++; 1048 u64_stats_update_end(&secy_stats->syncp); 1049 continue; 1050 } 1051 1052 /* deliver on this port */ 1053 nskb = skb_clone(skb, GFP_ATOMIC); 1054 if (!nskb) 1055 break; 1056 1057 nskb->dev = ndev; 1058 1059 if (netif_rx(nskb) == NET_RX_SUCCESS) { 1060 u64_stats_update_begin(&secy_stats->syncp); 1061 secy_stats->stats.InPktsUntagged++; 1062 u64_stats_update_end(&secy_stats->syncp); 1063 } 1064 } 1065 1066 out: 1067 rcu_read_unlock(); 1068 return ret; 1069 } 1070 1071 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 1072 { 1073 struct sk_buff *skb = *pskb; 1074 struct net_device *dev = skb->dev; 1075 struct macsec_eth_header *hdr; 1076 struct macsec_secy *secy = NULL; 1077 struct macsec_rx_sc *rx_sc; 1078 struct macsec_rx_sa *rx_sa; 1079 struct macsec_rxh_data *rxd; 1080 struct macsec_dev *macsec; 1081 unsigned int len; 1082 sci_t sci; 1083 u32 hdr_pn; 1084 bool cbit; 1085 struct pcpu_rx_sc_stats *rxsc_stats; 1086 struct pcpu_secy_stats *secy_stats; 1087 bool pulled_sci; 1088 int ret; 1089 1090 if (skb_headroom(skb) < ETH_HLEN) 1091 goto drop_direct; 1092 1093 hdr = macsec_ethhdr(skb); 1094 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) 1095 return handle_not_macsec(skb); 1096 1097 skb = skb_unshare(skb, GFP_ATOMIC); 1098 *pskb = skb; 1099 if (!skb) 1100 return RX_HANDLER_CONSUMED; 1101 1102 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1103 if (!pulled_sci) { 1104 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1105 goto drop_direct; 1106 } 1107 1108 hdr = macsec_ethhdr(skb); 1109 1110 /* Frames with a SecTAG that has the TCI E bit set but the C 1111 * bit clear are discarded, as this reserved encoding is used 1112 * to identify frames with a SecTAG that are not to be 1113 * delivered to the Controlled Port. 1114 */ 1115 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1116 return RX_HANDLER_PASS; 1117 1118 /* now, pull the extra length */ 1119 if (hdr->tci_an & MACSEC_TCI_SC) { 1120 if (!pulled_sci) 1121 goto drop_direct; 1122 } 1123 1124 /* ethernet header is part of crypto processing */ 1125 skb_push(skb, ETH_HLEN); 1126 1127 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1128 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1129 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci); 1130 1131 rcu_read_lock(); 1132 rxd = macsec_data_rcu(skb->dev); 1133 1134 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1135 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1136 1137 sc = sc ? macsec_rxsc_get(sc) : NULL; 1138 1139 if (sc) { 1140 secy = &macsec->secy; 1141 rx_sc = sc; 1142 break; 1143 } 1144 } 1145 1146 if (!secy) 1147 goto nosci; 1148 1149 dev = secy->netdev; 1150 macsec = macsec_priv(dev); 1151 secy_stats = this_cpu_ptr(macsec->stats); 1152 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1153 1154 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) { 1155 u64_stats_update_begin(&secy_stats->syncp); 1156 secy_stats->stats.InPktsBadTag++; 1157 u64_stats_update_end(&secy_stats->syncp); 1158 goto drop_nosa; 1159 } 1160 1161 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1162 if (!rx_sa) { 1163 /* 10.6.1 if the SA is not in use */ 1164 1165 /* If validateFrames is Strict or the C bit in the 1166 * SecTAG is set, discard 1167 */ 1168 if (hdr->tci_an & MACSEC_TCI_C || 1169 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1170 u64_stats_update_begin(&rxsc_stats->syncp); 1171 rxsc_stats->stats.InPktsNotUsingSA++; 1172 u64_stats_update_end(&rxsc_stats->syncp); 1173 goto drop_nosa; 1174 } 1175 1176 /* not Strict, the frame (with the SecTAG and ICV 1177 * removed) is delivered to the Controlled Port. 1178 */ 1179 u64_stats_update_begin(&rxsc_stats->syncp); 1180 rxsc_stats->stats.InPktsUnusedSA++; 1181 u64_stats_update_end(&rxsc_stats->syncp); 1182 goto deliver; 1183 } 1184 1185 /* First, PN check to avoid decrypting obviously wrong packets */ 1186 hdr_pn = ntohl(hdr->packet_number); 1187 if (secy->replay_protect) { 1188 bool late; 1189 1190 spin_lock(&rx_sa->lock); 1191 late = rx_sa->next_pn_halves.lower >= secy->replay_window && 1192 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window); 1193 1194 if (secy->xpn) 1195 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn); 1196 spin_unlock(&rx_sa->lock); 1197 1198 if (late) { 1199 u64_stats_update_begin(&rxsc_stats->syncp); 1200 rxsc_stats->stats.InPktsLate++; 1201 u64_stats_update_end(&rxsc_stats->syncp); 1202 goto drop; 1203 } 1204 } 1205 1206 macsec_skb_cb(skb)->rx_sa = rx_sa; 1207 1208 /* Disabled && !changed text => skip validation */ 1209 if (hdr->tci_an & MACSEC_TCI_C || 1210 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1211 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1212 1213 if (IS_ERR(skb)) { 1214 /* the decrypt callback needs the reference */ 1215 if (PTR_ERR(skb) != -EINPROGRESS) { 1216 macsec_rxsa_put(rx_sa); 1217 macsec_rxsc_put(rx_sc); 1218 } 1219 rcu_read_unlock(); 1220 *pskb = NULL; 1221 return RX_HANDLER_CONSUMED; 1222 } 1223 1224 if (!macsec_post_decrypt(skb, secy, hdr_pn)) 1225 goto drop; 1226 1227 deliver: 1228 macsec_finalize_skb(skb, secy->icv_len, 1229 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1230 macsec_reset_skb(skb, secy->netdev); 1231 1232 if (rx_sa) 1233 macsec_rxsa_put(rx_sa); 1234 macsec_rxsc_put(rx_sc); 1235 1236 skb_orphan(skb); 1237 len = skb->len; 1238 ret = gro_cells_receive(&macsec->gro_cells, skb); 1239 if (ret == NET_RX_SUCCESS) 1240 count_rx(dev, len); 1241 else 1242 macsec->secy.netdev->stats.rx_dropped++; 1243 1244 rcu_read_unlock(); 1245 1246 *pskb = NULL; 1247 return RX_HANDLER_CONSUMED; 1248 1249 drop: 1250 macsec_rxsa_put(rx_sa); 1251 drop_nosa: 1252 macsec_rxsc_put(rx_sc); 1253 rcu_read_unlock(); 1254 drop_direct: 1255 kfree_skb(skb); 1256 *pskb = NULL; 1257 return RX_HANDLER_CONSUMED; 1258 1259 nosci: 1260 /* 10.6.1 if the SC is not found */ 1261 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1262 if (!cbit) 1263 macsec_finalize_skb(skb, DEFAULT_ICV_LEN, 1264 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1265 1266 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1267 struct sk_buff *nskb; 1268 1269 secy_stats = this_cpu_ptr(macsec->stats); 1270 1271 /* If validateFrames is Strict or the C bit in the 1272 * SecTAG is set, discard 1273 */ 1274 if (cbit || 1275 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1276 u64_stats_update_begin(&secy_stats->syncp); 1277 secy_stats->stats.InPktsNoSCI++; 1278 u64_stats_update_end(&secy_stats->syncp); 1279 continue; 1280 } 1281 1282 /* not strict, the frame (with the SecTAG and ICV 1283 * removed) is delivered to the Controlled Port. 1284 */ 1285 nskb = skb_clone(skb, GFP_ATOMIC); 1286 if (!nskb) 1287 break; 1288 1289 macsec_reset_skb(nskb, macsec->secy.netdev); 1290 1291 ret = netif_rx(nskb); 1292 if (ret == NET_RX_SUCCESS) { 1293 u64_stats_update_begin(&secy_stats->syncp); 1294 secy_stats->stats.InPktsUnknownSCI++; 1295 u64_stats_update_end(&secy_stats->syncp); 1296 } else { 1297 macsec->secy.netdev->stats.rx_dropped++; 1298 } 1299 } 1300 1301 rcu_read_unlock(); 1302 *pskb = skb; 1303 return RX_HANDLER_PASS; 1304 } 1305 1306 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1307 { 1308 struct crypto_aead *tfm; 1309 int ret; 1310 1311 /* Pick a sync gcm(aes) cipher to ensure order is preserved. */ 1312 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC); 1313 1314 if (IS_ERR(tfm)) 1315 return tfm; 1316 1317 ret = crypto_aead_setkey(tfm, key, key_len); 1318 if (ret < 0) 1319 goto fail; 1320 1321 ret = crypto_aead_setauthsize(tfm, icv_len); 1322 if (ret < 0) 1323 goto fail; 1324 1325 return tfm; 1326 fail: 1327 crypto_free_aead(tfm); 1328 return ERR_PTR(ret); 1329 } 1330 1331 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1332 int icv_len) 1333 { 1334 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1335 if (!rx_sa->stats) 1336 return -ENOMEM; 1337 1338 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1339 if (IS_ERR(rx_sa->key.tfm)) { 1340 free_percpu(rx_sa->stats); 1341 return PTR_ERR(rx_sa->key.tfm); 1342 } 1343 1344 rx_sa->ssci = MACSEC_UNDEF_SSCI; 1345 rx_sa->active = false; 1346 rx_sa->next_pn = 1; 1347 refcount_set(&rx_sa->refcnt, 1); 1348 spin_lock_init(&rx_sa->lock); 1349 1350 return 0; 1351 } 1352 1353 static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1354 { 1355 rx_sa->active = false; 1356 1357 macsec_rxsa_put(rx_sa); 1358 } 1359 1360 static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1361 { 1362 int i; 1363 1364 for (i = 0; i < MACSEC_NUM_AN; i++) { 1365 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1366 1367 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1368 if (sa) 1369 clear_rx_sa(sa); 1370 } 1371 1372 macsec_rxsc_put(rx_sc); 1373 } 1374 1375 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1376 { 1377 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1378 1379 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1380 rx_sc; 1381 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1382 if (rx_sc->sci == sci) { 1383 if (rx_sc->active) 1384 secy->n_rx_sc--; 1385 rcu_assign_pointer(*rx_scp, rx_sc->next); 1386 return rx_sc; 1387 } 1388 } 1389 1390 return NULL; 1391 } 1392 1393 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci) 1394 { 1395 struct macsec_rx_sc *rx_sc; 1396 struct macsec_dev *macsec; 1397 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1398 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1399 struct macsec_secy *secy; 1400 1401 list_for_each_entry(macsec, &rxd->secys, secys) { 1402 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1403 return ERR_PTR(-EEXIST); 1404 } 1405 1406 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL); 1407 if (!rx_sc) 1408 return ERR_PTR(-ENOMEM); 1409 1410 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1411 if (!rx_sc->stats) { 1412 kfree(rx_sc); 1413 return ERR_PTR(-ENOMEM); 1414 } 1415 1416 rx_sc->sci = sci; 1417 rx_sc->active = true; 1418 refcount_set(&rx_sc->refcnt, 1); 1419 1420 secy = &macsec_priv(dev)->secy; 1421 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1422 rcu_assign_pointer(secy->rx_sc, rx_sc); 1423 1424 if (rx_sc->active) 1425 secy->n_rx_sc++; 1426 1427 return rx_sc; 1428 } 1429 1430 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1431 int icv_len) 1432 { 1433 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1434 if (!tx_sa->stats) 1435 return -ENOMEM; 1436 1437 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1438 if (IS_ERR(tx_sa->key.tfm)) { 1439 free_percpu(tx_sa->stats); 1440 return PTR_ERR(tx_sa->key.tfm); 1441 } 1442 1443 tx_sa->ssci = MACSEC_UNDEF_SSCI; 1444 tx_sa->active = false; 1445 refcount_set(&tx_sa->refcnt, 1); 1446 spin_lock_init(&tx_sa->lock); 1447 1448 return 0; 1449 } 1450 1451 static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1452 { 1453 tx_sa->active = false; 1454 1455 macsec_txsa_put(tx_sa); 1456 } 1457 1458 static struct genl_family macsec_fam; 1459 1460 static struct net_device *get_dev_from_nl(struct net *net, 1461 struct nlattr **attrs) 1462 { 1463 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1464 struct net_device *dev; 1465 1466 dev = __dev_get_by_index(net, ifindex); 1467 if (!dev) 1468 return ERR_PTR(-ENODEV); 1469 1470 if (!netif_is_macsec(dev)) 1471 return ERR_PTR(-ENODEV); 1472 1473 return dev; 1474 } 1475 1476 static enum macsec_offload nla_get_offload(const struct nlattr *nla) 1477 { 1478 return (__force enum macsec_offload)nla_get_u8(nla); 1479 } 1480 1481 static sci_t nla_get_sci(const struct nlattr *nla) 1482 { 1483 return (__force sci_t)nla_get_u64(nla); 1484 } 1485 1486 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, 1487 int padattr) 1488 { 1489 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); 1490 } 1491 1492 static ssci_t nla_get_ssci(const struct nlattr *nla) 1493 { 1494 return (__force ssci_t)nla_get_u32(nla); 1495 } 1496 1497 static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value) 1498 { 1499 return nla_put_u32(skb, attrtype, (__force u64)value); 1500 } 1501 1502 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1503 struct nlattr **attrs, 1504 struct nlattr **tb_sa, 1505 struct net_device **devp, 1506 struct macsec_secy **secyp, 1507 struct macsec_tx_sc **scp, 1508 u8 *assoc_num) 1509 { 1510 struct net_device *dev; 1511 struct macsec_secy *secy; 1512 struct macsec_tx_sc *tx_sc; 1513 struct macsec_tx_sa *tx_sa; 1514 1515 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1516 return ERR_PTR(-EINVAL); 1517 1518 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1519 1520 dev = get_dev_from_nl(net, attrs); 1521 if (IS_ERR(dev)) 1522 return ERR_CAST(dev); 1523 1524 if (*assoc_num >= MACSEC_NUM_AN) 1525 return ERR_PTR(-EINVAL); 1526 1527 secy = &macsec_priv(dev)->secy; 1528 tx_sc = &secy->tx_sc; 1529 1530 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1531 if (!tx_sa) 1532 return ERR_PTR(-ENODEV); 1533 1534 *devp = dev; 1535 *scp = tx_sc; 1536 *secyp = secy; 1537 return tx_sa; 1538 } 1539 1540 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1541 struct nlattr **attrs, 1542 struct nlattr **tb_rxsc, 1543 struct net_device **devp, 1544 struct macsec_secy **secyp) 1545 { 1546 struct net_device *dev; 1547 struct macsec_secy *secy; 1548 struct macsec_rx_sc *rx_sc; 1549 sci_t sci; 1550 1551 dev = get_dev_from_nl(net, attrs); 1552 if (IS_ERR(dev)) 1553 return ERR_CAST(dev); 1554 1555 secy = &macsec_priv(dev)->secy; 1556 1557 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1558 return ERR_PTR(-EINVAL); 1559 1560 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1561 rx_sc = find_rx_sc_rtnl(secy, sci); 1562 if (!rx_sc) 1563 return ERR_PTR(-ENODEV); 1564 1565 *secyp = secy; 1566 *devp = dev; 1567 1568 return rx_sc; 1569 } 1570 1571 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1572 struct nlattr **attrs, 1573 struct nlattr **tb_rxsc, 1574 struct nlattr **tb_sa, 1575 struct net_device **devp, 1576 struct macsec_secy **secyp, 1577 struct macsec_rx_sc **scp, 1578 u8 *assoc_num) 1579 { 1580 struct macsec_rx_sc *rx_sc; 1581 struct macsec_rx_sa *rx_sa; 1582 1583 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1584 return ERR_PTR(-EINVAL); 1585 1586 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1587 if (*assoc_num >= MACSEC_NUM_AN) 1588 return ERR_PTR(-EINVAL); 1589 1590 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1591 if (IS_ERR(rx_sc)) 1592 return ERR_CAST(rx_sc); 1593 1594 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1595 if (!rx_sa) 1596 return ERR_PTR(-ENODEV); 1597 1598 *scp = rx_sc; 1599 return rx_sa; 1600 } 1601 1602 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1603 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1604 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1605 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1606 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED }, 1607 }; 1608 1609 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1610 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1611 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, 1612 }; 1613 1614 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1615 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, 1616 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, 1617 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4), 1618 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY, 1619 .len = MACSEC_KEYID_LEN, }, 1620 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1621 .len = MACSEC_MAX_KEY_LEN, }, 1622 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 }, 1623 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY, 1624 .len = MACSEC_SALT_LEN, }, 1625 }; 1626 1627 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = { 1628 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 }, 1629 }; 1630 1631 /* Offloads an operation to a device driver */ 1632 static int macsec_offload(int (* const func)(struct macsec_context *), 1633 struct macsec_context *ctx) 1634 { 1635 int ret; 1636 1637 if (unlikely(!func)) 1638 return 0; 1639 1640 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1641 mutex_lock(&ctx->phydev->lock); 1642 1643 /* Phase I: prepare. The drive should fail here if there are going to be 1644 * issues in the commit phase. 1645 */ 1646 ctx->prepare = true; 1647 ret = (*func)(ctx); 1648 if (ret) 1649 goto phy_unlock; 1650 1651 /* Phase II: commit. This step cannot fail. */ 1652 ctx->prepare = false; 1653 ret = (*func)(ctx); 1654 /* This should never happen: commit is not allowed to fail */ 1655 if (unlikely(ret)) 1656 WARN(1, "MACsec offloading commit failed (%d)\n", ret); 1657 1658 phy_unlock: 1659 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1660 mutex_unlock(&ctx->phydev->lock); 1661 1662 return ret; 1663 } 1664 1665 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1666 { 1667 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1668 return -EINVAL; 1669 1670 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL)) 1671 return -EINVAL; 1672 1673 return 0; 1674 } 1675 1676 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1677 { 1678 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1679 return -EINVAL; 1680 1681 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL)) 1682 return -EINVAL; 1683 1684 return 0; 1685 } 1686 1687 static bool validate_add_rxsa(struct nlattr **attrs) 1688 { 1689 if (!attrs[MACSEC_SA_ATTR_AN] || 1690 !attrs[MACSEC_SA_ATTR_KEY] || 1691 !attrs[MACSEC_SA_ATTR_KEYID]) 1692 return false; 1693 1694 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1695 return false; 1696 1697 if (attrs[MACSEC_SA_ATTR_PN] && 1698 *(u64 *)nla_data(attrs[MACSEC_SA_ATTR_PN]) == 0) 1699 return false; 1700 1701 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1702 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1703 return false; 1704 } 1705 1706 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1707 return false; 1708 1709 return true; 1710 } 1711 1712 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1713 { 1714 struct net_device *dev; 1715 struct nlattr **attrs = info->attrs; 1716 struct macsec_secy *secy; 1717 struct macsec_rx_sc *rx_sc; 1718 struct macsec_rx_sa *rx_sa; 1719 unsigned char assoc_num; 1720 int pn_len; 1721 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1722 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1723 int err; 1724 1725 if (!attrs[MACSEC_ATTR_IFINDEX]) 1726 return -EINVAL; 1727 1728 if (parse_sa_config(attrs, tb_sa)) 1729 return -EINVAL; 1730 1731 if (parse_rxsc_config(attrs, tb_rxsc)) 1732 return -EINVAL; 1733 1734 if (!validate_add_rxsa(tb_sa)) 1735 return -EINVAL; 1736 1737 rtnl_lock(); 1738 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1739 if (IS_ERR(rx_sc)) { 1740 rtnl_unlock(); 1741 return PTR_ERR(rx_sc); 1742 } 1743 1744 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1745 1746 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1747 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1748 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1749 rtnl_unlock(); 1750 return -EINVAL; 1751 } 1752 1753 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1754 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1755 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n", 1756 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1757 rtnl_unlock(); 1758 return -EINVAL; 1759 } 1760 1761 if (secy->xpn) { 1762 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 1763 rtnl_unlock(); 1764 return -EINVAL; 1765 } 1766 1767 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 1768 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n", 1769 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 1770 MACSEC_SA_ATTR_SALT); 1771 rtnl_unlock(); 1772 return -EINVAL; 1773 } 1774 } 1775 1776 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1777 if (rx_sa) { 1778 rtnl_unlock(); 1779 return -EBUSY; 1780 } 1781 1782 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1783 if (!rx_sa) { 1784 rtnl_unlock(); 1785 return -ENOMEM; 1786 } 1787 1788 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1789 secy->key_len, secy->icv_len); 1790 if (err < 0) { 1791 kfree(rx_sa); 1792 rtnl_unlock(); 1793 return err; 1794 } 1795 1796 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1797 spin_lock_bh(&rx_sa->lock); 1798 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 1799 spin_unlock_bh(&rx_sa->lock); 1800 } 1801 1802 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1803 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1804 1805 rx_sa->sc = rx_sc; 1806 1807 /* If h/w offloading is available, propagate to the device */ 1808 if (macsec_is_offloaded(netdev_priv(dev))) { 1809 const struct macsec_ops *ops; 1810 struct macsec_context ctx; 1811 1812 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1813 if (!ops) { 1814 err = -EOPNOTSUPP; 1815 goto cleanup; 1816 } 1817 1818 ctx.sa.assoc_num = assoc_num; 1819 ctx.sa.rx_sa = rx_sa; 1820 ctx.secy = secy; 1821 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1822 secy->key_len); 1823 1824 err = macsec_offload(ops->mdo_add_rxsa, &ctx); 1825 if (err) 1826 goto cleanup; 1827 } 1828 1829 if (secy->xpn) { 1830 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 1831 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 1832 MACSEC_SALT_LEN); 1833 } 1834 1835 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1836 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1837 1838 rtnl_unlock(); 1839 1840 return 0; 1841 1842 cleanup: 1843 kfree(rx_sa); 1844 rtnl_unlock(); 1845 return err; 1846 } 1847 1848 static bool validate_add_rxsc(struct nlattr **attrs) 1849 { 1850 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1851 return false; 1852 1853 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1854 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1855 return false; 1856 } 1857 1858 return true; 1859 } 1860 1861 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1862 { 1863 struct net_device *dev; 1864 sci_t sci = MACSEC_UNDEF_SCI; 1865 struct nlattr **attrs = info->attrs; 1866 struct macsec_rx_sc *rx_sc; 1867 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1868 struct macsec_secy *secy; 1869 bool was_active; 1870 int ret; 1871 1872 if (!attrs[MACSEC_ATTR_IFINDEX]) 1873 return -EINVAL; 1874 1875 if (parse_rxsc_config(attrs, tb_rxsc)) 1876 return -EINVAL; 1877 1878 if (!validate_add_rxsc(tb_rxsc)) 1879 return -EINVAL; 1880 1881 rtnl_lock(); 1882 dev = get_dev_from_nl(genl_info_net(info), attrs); 1883 if (IS_ERR(dev)) { 1884 rtnl_unlock(); 1885 return PTR_ERR(dev); 1886 } 1887 1888 secy = &macsec_priv(dev)->secy; 1889 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1890 1891 rx_sc = create_rx_sc(dev, sci); 1892 if (IS_ERR(rx_sc)) { 1893 rtnl_unlock(); 1894 return PTR_ERR(rx_sc); 1895 } 1896 1897 was_active = rx_sc->active; 1898 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1899 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1900 1901 if (macsec_is_offloaded(netdev_priv(dev))) { 1902 const struct macsec_ops *ops; 1903 struct macsec_context ctx; 1904 1905 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1906 if (!ops) { 1907 ret = -EOPNOTSUPP; 1908 goto cleanup; 1909 } 1910 1911 ctx.rx_sc = rx_sc; 1912 ctx.secy = secy; 1913 1914 ret = macsec_offload(ops->mdo_add_rxsc, &ctx); 1915 if (ret) 1916 goto cleanup; 1917 } 1918 1919 rtnl_unlock(); 1920 1921 return 0; 1922 1923 cleanup: 1924 rx_sc->active = was_active; 1925 rtnl_unlock(); 1926 return ret; 1927 } 1928 1929 static bool validate_add_txsa(struct nlattr **attrs) 1930 { 1931 if (!attrs[MACSEC_SA_ATTR_AN] || 1932 !attrs[MACSEC_SA_ATTR_PN] || 1933 !attrs[MACSEC_SA_ATTR_KEY] || 1934 !attrs[MACSEC_SA_ATTR_KEYID]) 1935 return false; 1936 1937 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1938 return false; 1939 1940 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1941 return false; 1942 1943 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1944 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1945 return false; 1946 } 1947 1948 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1949 return false; 1950 1951 return true; 1952 } 1953 1954 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1955 { 1956 struct net_device *dev; 1957 struct nlattr **attrs = info->attrs; 1958 struct macsec_secy *secy; 1959 struct macsec_tx_sc *tx_sc; 1960 struct macsec_tx_sa *tx_sa; 1961 unsigned char assoc_num; 1962 int pn_len; 1963 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1964 bool was_operational; 1965 int err; 1966 1967 if (!attrs[MACSEC_ATTR_IFINDEX]) 1968 return -EINVAL; 1969 1970 if (parse_sa_config(attrs, tb_sa)) 1971 return -EINVAL; 1972 1973 if (!validate_add_txsa(tb_sa)) 1974 return -EINVAL; 1975 1976 rtnl_lock(); 1977 dev = get_dev_from_nl(genl_info_net(info), attrs); 1978 if (IS_ERR(dev)) { 1979 rtnl_unlock(); 1980 return PTR_ERR(dev); 1981 } 1982 1983 secy = &macsec_priv(dev)->secy; 1984 tx_sc = &secy->tx_sc; 1985 1986 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1987 1988 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1989 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 1990 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1991 rtnl_unlock(); 1992 return -EINVAL; 1993 } 1994 1995 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1996 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1997 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n", 1998 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1999 rtnl_unlock(); 2000 return -EINVAL; 2001 } 2002 2003 if (secy->xpn) { 2004 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 2005 rtnl_unlock(); 2006 return -EINVAL; 2007 } 2008 2009 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 2010 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n", 2011 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 2012 MACSEC_SA_ATTR_SALT); 2013 rtnl_unlock(); 2014 return -EINVAL; 2015 } 2016 } 2017 2018 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 2019 if (tx_sa) { 2020 rtnl_unlock(); 2021 return -EBUSY; 2022 } 2023 2024 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 2025 if (!tx_sa) { 2026 rtnl_unlock(); 2027 return -ENOMEM; 2028 } 2029 2030 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2031 secy->key_len, secy->icv_len); 2032 if (err < 0) { 2033 kfree(tx_sa); 2034 rtnl_unlock(); 2035 return err; 2036 } 2037 2038 spin_lock_bh(&tx_sa->lock); 2039 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2040 spin_unlock_bh(&tx_sa->lock); 2041 2042 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2043 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2044 2045 was_operational = secy->operational; 2046 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 2047 secy->operational = true; 2048 2049 /* If h/w offloading is available, propagate to the device */ 2050 if (macsec_is_offloaded(netdev_priv(dev))) { 2051 const struct macsec_ops *ops; 2052 struct macsec_context ctx; 2053 2054 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2055 if (!ops) { 2056 err = -EOPNOTSUPP; 2057 goto cleanup; 2058 } 2059 2060 ctx.sa.assoc_num = assoc_num; 2061 ctx.sa.tx_sa = tx_sa; 2062 ctx.secy = secy; 2063 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2064 secy->key_len); 2065 2066 err = macsec_offload(ops->mdo_add_txsa, &ctx); 2067 if (err) 2068 goto cleanup; 2069 } 2070 2071 if (secy->xpn) { 2072 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 2073 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 2074 MACSEC_SALT_LEN); 2075 } 2076 2077 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 2078 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 2079 2080 rtnl_unlock(); 2081 2082 return 0; 2083 2084 cleanup: 2085 secy->operational = was_operational; 2086 kfree(tx_sa); 2087 rtnl_unlock(); 2088 return err; 2089 } 2090 2091 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 2092 { 2093 struct nlattr **attrs = info->attrs; 2094 struct net_device *dev; 2095 struct macsec_secy *secy; 2096 struct macsec_rx_sc *rx_sc; 2097 struct macsec_rx_sa *rx_sa; 2098 u8 assoc_num; 2099 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2100 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2101 int ret; 2102 2103 if (!attrs[MACSEC_ATTR_IFINDEX]) 2104 return -EINVAL; 2105 2106 if (parse_sa_config(attrs, tb_sa)) 2107 return -EINVAL; 2108 2109 if (parse_rxsc_config(attrs, tb_rxsc)) 2110 return -EINVAL; 2111 2112 rtnl_lock(); 2113 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2114 &dev, &secy, &rx_sc, &assoc_num); 2115 if (IS_ERR(rx_sa)) { 2116 rtnl_unlock(); 2117 return PTR_ERR(rx_sa); 2118 } 2119 2120 if (rx_sa->active) { 2121 rtnl_unlock(); 2122 return -EBUSY; 2123 } 2124 2125 /* If h/w offloading is available, propagate to the device */ 2126 if (macsec_is_offloaded(netdev_priv(dev))) { 2127 const struct macsec_ops *ops; 2128 struct macsec_context ctx; 2129 2130 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2131 if (!ops) { 2132 ret = -EOPNOTSUPP; 2133 goto cleanup; 2134 } 2135 2136 ctx.sa.assoc_num = assoc_num; 2137 ctx.sa.rx_sa = rx_sa; 2138 ctx.secy = secy; 2139 2140 ret = macsec_offload(ops->mdo_del_rxsa, &ctx); 2141 if (ret) 2142 goto cleanup; 2143 } 2144 2145 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 2146 clear_rx_sa(rx_sa); 2147 2148 rtnl_unlock(); 2149 2150 return 0; 2151 2152 cleanup: 2153 rtnl_unlock(); 2154 return ret; 2155 } 2156 2157 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 2158 { 2159 struct nlattr **attrs = info->attrs; 2160 struct net_device *dev; 2161 struct macsec_secy *secy; 2162 struct macsec_rx_sc *rx_sc; 2163 sci_t sci; 2164 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2165 int ret; 2166 2167 if (!attrs[MACSEC_ATTR_IFINDEX]) 2168 return -EINVAL; 2169 2170 if (parse_rxsc_config(attrs, tb_rxsc)) 2171 return -EINVAL; 2172 2173 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 2174 return -EINVAL; 2175 2176 rtnl_lock(); 2177 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 2178 if (IS_ERR(dev)) { 2179 rtnl_unlock(); 2180 return PTR_ERR(dev); 2181 } 2182 2183 secy = &macsec_priv(dev)->secy; 2184 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 2185 2186 rx_sc = del_rx_sc(secy, sci); 2187 if (!rx_sc) { 2188 rtnl_unlock(); 2189 return -ENODEV; 2190 } 2191 2192 /* If h/w offloading is available, propagate to the device */ 2193 if (macsec_is_offloaded(netdev_priv(dev))) { 2194 const struct macsec_ops *ops; 2195 struct macsec_context ctx; 2196 2197 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2198 if (!ops) { 2199 ret = -EOPNOTSUPP; 2200 goto cleanup; 2201 } 2202 2203 ctx.rx_sc = rx_sc; 2204 ctx.secy = secy; 2205 ret = macsec_offload(ops->mdo_del_rxsc, &ctx); 2206 if (ret) 2207 goto cleanup; 2208 } 2209 2210 free_rx_sc(rx_sc); 2211 rtnl_unlock(); 2212 2213 return 0; 2214 2215 cleanup: 2216 rtnl_unlock(); 2217 return ret; 2218 } 2219 2220 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 2221 { 2222 struct nlattr **attrs = info->attrs; 2223 struct net_device *dev; 2224 struct macsec_secy *secy; 2225 struct macsec_tx_sc *tx_sc; 2226 struct macsec_tx_sa *tx_sa; 2227 u8 assoc_num; 2228 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2229 int ret; 2230 2231 if (!attrs[MACSEC_ATTR_IFINDEX]) 2232 return -EINVAL; 2233 2234 if (parse_sa_config(attrs, tb_sa)) 2235 return -EINVAL; 2236 2237 rtnl_lock(); 2238 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2239 &dev, &secy, &tx_sc, &assoc_num); 2240 if (IS_ERR(tx_sa)) { 2241 rtnl_unlock(); 2242 return PTR_ERR(tx_sa); 2243 } 2244 2245 if (tx_sa->active) { 2246 rtnl_unlock(); 2247 return -EBUSY; 2248 } 2249 2250 /* If h/w offloading is available, propagate to the device */ 2251 if (macsec_is_offloaded(netdev_priv(dev))) { 2252 const struct macsec_ops *ops; 2253 struct macsec_context ctx; 2254 2255 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2256 if (!ops) { 2257 ret = -EOPNOTSUPP; 2258 goto cleanup; 2259 } 2260 2261 ctx.sa.assoc_num = assoc_num; 2262 ctx.sa.tx_sa = tx_sa; 2263 ctx.secy = secy; 2264 2265 ret = macsec_offload(ops->mdo_del_txsa, &ctx); 2266 if (ret) 2267 goto cleanup; 2268 } 2269 2270 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 2271 clear_tx_sa(tx_sa); 2272 2273 rtnl_unlock(); 2274 2275 return 0; 2276 2277 cleanup: 2278 rtnl_unlock(); 2279 return ret; 2280 } 2281 2282 static bool validate_upd_sa(struct nlattr **attrs) 2283 { 2284 if (!attrs[MACSEC_SA_ATTR_AN] || 2285 attrs[MACSEC_SA_ATTR_KEY] || 2286 attrs[MACSEC_SA_ATTR_KEYID] || 2287 attrs[MACSEC_SA_ATTR_SSCI] || 2288 attrs[MACSEC_SA_ATTR_SALT]) 2289 return false; 2290 2291 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 2292 return false; 2293 2294 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 2295 return false; 2296 2297 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 2298 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 2299 return false; 2300 } 2301 2302 return true; 2303 } 2304 2305 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2306 { 2307 struct nlattr **attrs = info->attrs; 2308 struct net_device *dev; 2309 struct macsec_secy *secy; 2310 struct macsec_tx_sc *tx_sc; 2311 struct macsec_tx_sa *tx_sa; 2312 u8 assoc_num; 2313 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2314 bool was_operational, was_active; 2315 pn_t prev_pn; 2316 int ret = 0; 2317 2318 prev_pn.full64 = 0; 2319 2320 if (!attrs[MACSEC_ATTR_IFINDEX]) 2321 return -EINVAL; 2322 2323 if (parse_sa_config(attrs, tb_sa)) 2324 return -EINVAL; 2325 2326 if (!validate_upd_sa(tb_sa)) 2327 return -EINVAL; 2328 2329 rtnl_lock(); 2330 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2331 &dev, &secy, &tx_sc, &assoc_num); 2332 if (IS_ERR(tx_sa)) { 2333 rtnl_unlock(); 2334 return PTR_ERR(tx_sa); 2335 } 2336 2337 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2338 int pn_len; 2339 2340 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2341 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2342 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n", 2343 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2344 rtnl_unlock(); 2345 return -EINVAL; 2346 } 2347 2348 spin_lock_bh(&tx_sa->lock); 2349 prev_pn = tx_sa->next_pn_halves; 2350 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2351 spin_unlock_bh(&tx_sa->lock); 2352 } 2353 2354 was_active = tx_sa->active; 2355 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2356 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2357 2358 was_operational = secy->operational; 2359 if (assoc_num == tx_sc->encoding_sa) 2360 secy->operational = tx_sa->active; 2361 2362 /* If h/w offloading is available, propagate to the device */ 2363 if (macsec_is_offloaded(netdev_priv(dev))) { 2364 const struct macsec_ops *ops; 2365 struct macsec_context ctx; 2366 2367 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2368 if (!ops) { 2369 ret = -EOPNOTSUPP; 2370 goto cleanup; 2371 } 2372 2373 ctx.sa.assoc_num = assoc_num; 2374 ctx.sa.tx_sa = tx_sa; 2375 ctx.secy = secy; 2376 2377 ret = macsec_offload(ops->mdo_upd_txsa, &ctx); 2378 if (ret) 2379 goto cleanup; 2380 } 2381 2382 rtnl_unlock(); 2383 2384 return 0; 2385 2386 cleanup: 2387 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2388 spin_lock_bh(&tx_sa->lock); 2389 tx_sa->next_pn_halves = prev_pn; 2390 spin_unlock_bh(&tx_sa->lock); 2391 } 2392 tx_sa->active = was_active; 2393 secy->operational = was_operational; 2394 rtnl_unlock(); 2395 return ret; 2396 } 2397 2398 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2399 { 2400 struct nlattr **attrs = info->attrs; 2401 struct net_device *dev; 2402 struct macsec_secy *secy; 2403 struct macsec_rx_sc *rx_sc; 2404 struct macsec_rx_sa *rx_sa; 2405 u8 assoc_num; 2406 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2407 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2408 bool was_active; 2409 pn_t prev_pn; 2410 int ret = 0; 2411 2412 prev_pn.full64 = 0; 2413 2414 if (!attrs[MACSEC_ATTR_IFINDEX]) 2415 return -EINVAL; 2416 2417 if (parse_rxsc_config(attrs, tb_rxsc)) 2418 return -EINVAL; 2419 2420 if (parse_sa_config(attrs, tb_sa)) 2421 return -EINVAL; 2422 2423 if (!validate_upd_sa(tb_sa)) 2424 return -EINVAL; 2425 2426 rtnl_lock(); 2427 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2428 &dev, &secy, &rx_sc, &assoc_num); 2429 if (IS_ERR(rx_sa)) { 2430 rtnl_unlock(); 2431 return PTR_ERR(rx_sa); 2432 } 2433 2434 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2435 int pn_len; 2436 2437 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2438 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2439 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n", 2440 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2441 rtnl_unlock(); 2442 return -EINVAL; 2443 } 2444 2445 spin_lock_bh(&rx_sa->lock); 2446 prev_pn = rx_sa->next_pn_halves; 2447 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2448 spin_unlock_bh(&rx_sa->lock); 2449 } 2450 2451 was_active = rx_sa->active; 2452 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2453 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2454 2455 /* If h/w offloading is available, propagate to the device */ 2456 if (macsec_is_offloaded(netdev_priv(dev))) { 2457 const struct macsec_ops *ops; 2458 struct macsec_context ctx; 2459 2460 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2461 if (!ops) { 2462 ret = -EOPNOTSUPP; 2463 goto cleanup; 2464 } 2465 2466 ctx.sa.assoc_num = assoc_num; 2467 ctx.sa.rx_sa = rx_sa; 2468 ctx.secy = secy; 2469 2470 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx); 2471 if (ret) 2472 goto cleanup; 2473 } 2474 2475 rtnl_unlock(); 2476 return 0; 2477 2478 cleanup: 2479 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2480 spin_lock_bh(&rx_sa->lock); 2481 rx_sa->next_pn_halves = prev_pn; 2482 spin_unlock_bh(&rx_sa->lock); 2483 } 2484 rx_sa->active = was_active; 2485 rtnl_unlock(); 2486 return ret; 2487 } 2488 2489 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2490 { 2491 struct nlattr **attrs = info->attrs; 2492 struct net_device *dev; 2493 struct macsec_secy *secy; 2494 struct macsec_rx_sc *rx_sc; 2495 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2496 unsigned int prev_n_rx_sc; 2497 bool was_active; 2498 int ret; 2499 2500 if (!attrs[MACSEC_ATTR_IFINDEX]) 2501 return -EINVAL; 2502 2503 if (parse_rxsc_config(attrs, tb_rxsc)) 2504 return -EINVAL; 2505 2506 if (!validate_add_rxsc(tb_rxsc)) 2507 return -EINVAL; 2508 2509 rtnl_lock(); 2510 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2511 if (IS_ERR(rx_sc)) { 2512 rtnl_unlock(); 2513 return PTR_ERR(rx_sc); 2514 } 2515 2516 was_active = rx_sc->active; 2517 prev_n_rx_sc = secy->n_rx_sc; 2518 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2519 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2520 2521 if (rx_sc->active != new) 2522 secy->n_rx_sc += new ? 1 : -1; 2523 2524 rx_sc->active = new; 2525 } 2526 2527 /* If h/w offloading is available, propagate to the device */ 2528 if (macsec_is_offloaded(netdev_priv(dev))) { 2529 const struct macsec_ops *ops; 2530 struct macsec_context ctx; 2531 2532 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2533 if (!ops) { 2534 ret = -EOPNOTSUPP; 2535 goto cleanup; 2536 } 2537 2538 ctx.rx_sc = rx_sc; 2539 ctx.secy = secy; 2540 2541 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx); 2542 if (ret) 2543 goto cleanup; 2544 } 2545 2546 rtnl_unlock(); 2547 2548 return 0; 2549 2550 cleanup: 2551 secy->n_rx_sc = prev_n_rx_sc; 2552 rx_sc->active = was_active; 2553 rtnl_unlock(); 2554 return ret; 2555 } 2556 2557 static bool macsec_is_configured(struct macsec_dev *macsec) 2558 { 2559 struct macsec_secy *secy = &macsec->secy; 2560 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2561 int i; 2562 2563 if (secy->n_rx_sc > 0) 2564 return true; 2565 2566 for (i = 0; i < MACSEC_NUM_AN; i++) 2567 if (tx_sc->sa[i]) 2568 return true; 2569 2570 return false; 2571 } 2572 2573 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info) 2574 { 2575 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1]; 2576 enum macsec_offload offload, prev_offload; 2577 int (*func)(struct macsec_context *ctx); 2578 struct nlattr **attrs = info->attrs; 2579 struct net_device *dev; 2580 const struct macsec_ops *ops; 2581 struct macsec_context ctx; 2582 struct macsec_dev *macsec; 2583 int ret; 2584 2585 if (!attrs[MACSEC_ATTR_IFINDEX]) 2586 return -EINVAL; 2587 2588 if (!attrs[MACSEC_ATTR_OFFLOAD]) 2589 return -EINVAL; 2590 2591 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX, 2592 attrs[MACSEC_ATTR_OFFLOAD], 2593 macsec_genl_offload_policy, NULL)) 2594 return -EINVAL; 2595 2596 dev = get_dev_from_nl(genl_info_net(info), attrs); 2597 if (IS_ERR(dev)) 2598 return PTR_ERR(dev); 2599 macsec = macsec_priv(dev); 2600 2601 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) 2602 return -EINVAL; 2603 2604 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]); 2605 if (macsec->offload == offload) 2606 return 0; 2607 2608 /* Check if the offloading mode is supported by the underlying layers */ 2609 if (offload != MACSEC_OFFLOAD_OFF && 2610 !macsec_check_offload(offload, macsec)) 2611 return -EOPNOTSUPP; 2612 2613 /* Check if the net device is busy. */ 2614 if (netif_running(dev)) 2615 return -EBUSY; 2616 2617 rtnl_lock(); 2618 2619 prev_offload = macsec->offload; 2620 macsec->offload = offload; 2621 2622 /* Check if the device already has rules configured: we do not support 2623 * rules migration. 2624 */ 2625 if (macsec_is_configured(macsec)) { 2626 ret = -EBUSY; 2627 goto rollback; 2628 } 2629 2630 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload, 2631 macsec, &ctx); 2632 if (!ops) { 2633 ret = -EOPNOTSUPP; 2634 goto rollback; 2635 } 2636 2637 if (prev_offload == MACSEC_OFFLOAD_OFF) 2638 func = ops->mdo_add_secy; 2639 else 2640 func = ops->mdo_del_secy; 2641 2642 ctx.secy = &macsec->secy; 2643 ret = macsec_offload(func, &ctx); 2644 if (ret) 2645 goto rollback; 2646 2647 /* Force features update, since they are different for SW MACSec and 2648 * HW offloading cases. 2649 */ 2650 netdev_update_features(dev); 2651 2652 rtnl_unlock(); 2653 return 0; 2654 2655 rollback: 2656 macsec->offload = prev_offload; 2657 2658 rtnl_unlock(); 2659 return ret; 2660 } 2661 2662 static void get_tx_sa_stats(struct net_device *dev, int an, 2663 struct macsec_tx_sa *tx_sa, 2664 struct macsec_tx_sa_stats *sum) 2665 { 2666 struct macsec_dev *macsec = macsec_priv(dev); 2667 int cpu; 2668 2669 /* If h/w offloading is available, propagate to the device */ 2670 if (macsec_is_offloaded(macsec)) { 2671 const struct macsec_ops *ops; 2672 struct macsec_context ctx; 2673 2674 ops = macsec_get_ops(macsec, &ctx); 2675 if (ops) { 2676 ctx.sa.assoc_num = an; 2677 ctx.sa.tx_sa = tx_sa; 2678 ctx.stats.tx_sa_stats = sum; 2679 ctx.secy = &macsec_priv(dev)->secy; 2680 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx); 2681 } 2682 return; 2683 } 2684 2685 for_each_possible_cpu(cpu) { 2686 const struct macsec_tx_sa_stats *stats = 2687 per_cpu_ptr(tx_sa->stats, cpu); 2688 2689 sum->OutPktsProtected += stats->OutPktsProtected; 2690 sum->OutPktsEncrypted += stats->OutPktsEncrypted; 2691 } 2692 } 2693 2694 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum) 2695 { 2696 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, 2697 sum->OutPktsProtected) || 2698 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2699 sum->OutPktsEncrypted)) 2700 return -EMSGSIZE; 2701 2702 return 0; 2703 } 2704 2705 static void get_rx_sa_stats(struct net_device *dev, 2706 struct macsec_rx_sc *rx_sc, int an, 2707 struct macsec_rx_sa *rx_sa, 2708 struct macsec_rx_sa_stats *sum) 2709 { 2710 struct macsec_dev *macsec = macsec_priv(dev); 2711 int cpu; 2712 2713 /* If h/w offloading is available, propagate to the device */ 2714 if (macsec_is_offloaded(macsec)) { 2715 const struct macsec_ops *ops; 2716 struct macsec_context ctx; 2717 2718 ops = macsec_get_ops(macsec, &ctx); 2719 if (ops) { 2720 ctx.sa.assoc_num = an; 2721 ctx.sa.rx_sa = rx_sa; 2722 ctx.stats.rx_sa_stats = sum; 2723 ctx.secy = &macsec_priv(dev)->secy; 2724 ctx.rx_sc = rx_sc; 2725 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx); 2726 } 2727 return; 2728 } 2729 2730 for_each_possible_cpu(cpu) { 2731 const struct macsec_rx_sa_stats *stats = 2732 per_cpu_ptr(rx_sa->stats, cpu); 2733 2734 sum->InPktsOK += stats->InPktsOK; 2735 sum->InPktsInvalid += stats->InPktsInvalid; 2736 sum->InPktsNotValid += stats->InPktsNotValid; 2737 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA; 2738 sum->InPktsUnusedSA += stats->InPktsUnusedSA; 2739 } 2740 } 2741 2742 static int copy_rx_sa_stats(struct sk_buff *skb, 2743 struct macsec_rx_sa_stats *sum) 2744 { 2745 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) || 2746 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, 2747 sum->InPktsInvalid) || 2748 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, 2749 sum->InPktsNotValid) || 2750 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2751 sum->InPktsNotUsingSA) || 2752 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, 2753 sum->InPktsUnusedSA)) 2754 return -EMSGSIZE; 2755 2756 return 0; 2757 } 2758 2759 static void get_rx_sc_stats(struct net_device *dev, 2760 struct macsec_rx_sc *rx_sc, 2761 struct macsec_rx_sc_stats *sum) 2762 { 2763 struct macsec_dev *macsec = macsec_priv(dev); 2764 int cpu; 2765 2766 /* If h/w offloading is available, propagate to the device */ 2767 if (macsec_is_offloaded(macsec)) { 2768 const struct macsec_ops *ops; 2769 struct macsec_context ctx; 2770 2771 ops = macsec_get_ops(macsec, &ctx); 2772 if (ops) { 2773 ctx.stats.rx_sc_stats = sum; 2774 ctx.secy = &macsec_priv(dev)->secy; 2775 ctx.rx_sc = rx_sc; 2776 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx); 2777 } 2778 return; 2779 } 2780 2781 for_each_possible_cpu(cpu) { 2782 const struct pcpu_rx_sc_stats *stats; 2783 struct macsec_rx_sc_stats tmp; 2784 unsigned int start; 2785 2786 stats = per_cpu_ptr(rx_sc->stats, cpu); 2787 do { 2788 start = u64_stats_fetch_begin_irq(&stats->syncp); 2789 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2790 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2791 2792 sum->InOctetsValidated += tmp.InOctetsValidated; 2793 sum->InOctetsDecrypted += tmp.InOctetsDecrypted; 2794 sum->InPktsUnchecked += tmp.InPktsUnchecked; 2795 sum->InPktsDelayed += tmp.InPktsDelayed; 2796 sum->InPktsOK += tmp.InPktsOK; 2797 sum->InPktsInvalid += tmp.InPktsInvalid; 2798 sum->InPktsLate += tmp.InPktsLate; 2799 sum->InPktsNotValid += tmp.InPktsNotValid; 2800 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2801 sum->InPktsUnusedSA += tmp.InPktsUnusedSA; 2802 } 2803 } 2804 2805 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum) 2806 { 2807 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2808 sum->InOctetsValidated, 2809 MACSEC_RXSC_STATS_ATTR_PAD) || 2810 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2811 sum->InOctetsDecrypted, 2812 MACSEC_RXSC_STATS_ATTR_PAD) || 2813 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2814 sum->InPktsUnchecked, 2815 MACSEC_RXSC_STATS_ATTR_PAD) || 2816 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2817 sum->InPktsDelayed, 2818 MACSEC_RXSC_STATS_ATTR_PAD) || 2819 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2820 sum->InPktsOK, 2821 MACSEC_RXSC_STATS_ATTR_PAD) || 2822 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2823 sum->InPktsInvalid, 2824 MACSEC_RXSC_STATS_ATTR_PAD) || 2825 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2826 sum->InPktsLate, 2827 MACSEC_RXSC_STATS_ATTR_PAD) || 2828 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2829 sum->InPktsNotValid, 2830 MACSEC_RXSC_STATS_ATTR_PAD) || 2831 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2832 sum->InPktsNotUsingSA, 2833 MACSEC_RXSC_STATS_ATTR_PAD) || 2834 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2835 sum->InPktsUnusedSA, 2836 MACSEC_RXSC_STATS_ATTR_PAD)) 2837 return -EMSGSIZE; 2838 2839 return 0; 2840 } 2841 2842 static void get_tx_sc_stats(struct net_device *dev, 2843 struct macsec_tx_sc_stats *sum) 2844 { 2845 struct macsec_dev *macsec = macsec_priv(dev); 2846 int cpu; 2847 2848 /* If h/w offloading is available, propagate to the device */ 2849 if (macsec_is_offloaded(macsec)) { 2850 const struct macsec_ops *ops; 2851 struct macsec_context ctx; 2852 2853 ops = macsec_get_ops(macsec, &ctx); 2854 if (ops) { 2855 ctx.stats.tx_sc_stats = sum; 2856 ctx.secy = &macsec_priv(dev)->secy; 2857 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx); 2858 } 2859 return; 2860 } 2861 2862 for_each_possible_cpu(cpu) { 2863 const struct pcpu_tx_sc_stats *stats; 2864 struct macsec_tx_sc_stats tmp; 2865 unsigned int start; 2866 2867 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu); 2868 do { 2869 start = u64_stats_fetch_begin_irq(&stats->syncp); 2870 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2871 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2872 2873 sum->OutPktsProtected += tmp.OutPktsProtected; 2874 sum->OutPktsEncrypted += tmp.OutPktsEncrypted; 2875 sum->OutOctetsProtected += tmp.OutOctetsProtected; 2876 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2877 } 2878 } 2879 2880 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum) 2881 { 2882 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2883 sum->OutPktsProtected, 2884 MACSEC_TXSC_STATS_ATTR_PAD) || 2885 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2886 sum->OutPktsEncrypted, 2887 MACSEC_TXSC_STATS_ATTR_PAD) || 2888 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2889 sum->OutOctetsProtected, 2890 MACSEC_TXSC_STATS_ATTR_PAD) || 2891 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2892 sum->OutOctetsEncrypted, 2893 MACSEC_TXSC_STATS_ATTR_PAD)) 2894 return -EMSGSIZE; 2895 2896 return 0; 2897 } 2898 2899 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum) 2900 { 2901 struct macsec_dev *macsec = macsec_priv(dev); 2902 int cpu; 2903 2904 /* If h/w offloading is available, propagate to the device */ 2905 if (macsec_is_offloaded(macsec)) { 2906 const struct macsec_ops *ops; 2907 struct macsec_context ctx; 2908 2909 ops = macsec_get_ops(macsec, &ctx); 2910 if (ops) { 2911 ctx.stats.dev_stats = sum; 2912 ctx.secy = &macsec_priv(dev)->secy; 2913 macsec_offload(ops->mdo_get_dev_stats, &ctx); 2914 } 2915 return; 2916 } 2917 2918 for_each_possible_cpu(cpu) { 2919 const struct pcpu_secy_stats *stats; 2920 struct macsec_dev_stats tmp; 2921 unsigned int start; 2922 2923 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu); 2924 do { 2925 start = u64_stats_fetch_begin_irq(&stats->syncp); 2926 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2927 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2928 2929 sum->OutPktsUntagged += tmp.OutPktsUntagged; 2930 sum->InPktsUntagged += tmp.InPktsUntagged; 2931 sum->OutPktsTooLong += tmp.OutPktsTooLong; 2932 sum->InPktsNoTag += tmp.InPktsNoTag; 2933 sum->InPktsBadTag += tmp.InPktsBadTag; 2934 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2935 sum->InPktsNoSCI += tmp.InPktsNoSCI; 2936 sum->InPktsOverrun += tmp.InPktsOverrun; 2937 } 2938 } 2939 2940 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum) 2941 { 2942 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 2943 sum->OutPktsUntagged, 2944 MACSEC_SECY_STATS_ATTR_PAD) || 2945 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 2946 sum->InPktsUntagged, 2947 MACSEC_SECY_STATS_ATTR_PAD) || 2948 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 2949 sum->OutPktsTooLong, 2950 MACSEC_SECY_STATS_ATTR_PAD) || 2951 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 2952 sum->InPktsNoTag, 2953 MACSEC_SECY_STATS_ATTR_PAD) || 2954 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 2955 sum->InPktsBadTag, 2956 MACSEC_SECY_STATS_ATTR_PAD) || 2957 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 2958 sum->InPktsUnknownSCI, 2959 MACSEC_SECY_STATS_ATTR_PAD) || 2960 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 2961 sum->InPktsNoSCI, 2962 MACSEC_SECY_STATS_ATTR_PAD) || 2963 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 2964 sum->InPktsOverrun, 2965 MACSEC_SECY_STATS_ATTR_PAD)) 2966 return -EMSGSIZE; 2967 2968 return 0; 2969 } 2970 2971 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 2972 { 2973 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2974 struct nlattr *secy_nest = nla_nest_start_noflag(skb, 2975 MACSEC_ATTR_SECY); 2976 u64 csid; 2977 2978 if (!secy_nest) 2979 return 1; 2980 2981 switch (secy->key_len) { 2982 case MACSEC_GCM_AES_128_SAK_LEN: 2983 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 2984 break; 2985 case MACSEC_GCM_AES_256_SAK_LEN: 2986 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 2987 break; 2988 default: 2989 goto cancel; 2990 } 2991 2992 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 2993 MACSEC_SECY_ATTR_PAD) || 2994 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 2995 csid, MACSEC_SECY_ATTR_PAD) || 2996 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 2997 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 2998 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 2999 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 3000 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 3001 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 3002 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 3003 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 3004 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 3005 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 3006 goto cancel; 3007 3008 if (secy->replay_protect) { 3009 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 3010 goto cancel; 3011 } 3012 3013 nla_nest_end(skb, secy_nest); 3014 return 0; 3015 3016 cancel: 3017 nla_nest_cancel(skb, secy_nest); 3018 return 1; 3019 } 3020 3021 static noinline_for_stack int 3022 dump_secy(struct macsec_secy *secy, struct net_device *dev, 3023 struct sk_buff *skb, struct netlink_callback *cb) 3024 { 3025 struct macsec_tx_sc_stats tx_sc_stats = {0, }; 3026 struct macsec_tx_sa_stats tx_sa_stats = {0, }; 3027 struct macsec_rx_sc_stats rx_sc_stats = {0, }; 3028 struct macsec_rx_sa_stats rx_sa_stats = {0, }; 3029 struct macsec_dev *macsec = netdev_priv(dev); 3030 struct macsec_dev_stats dev_stats = {0, }; 3031 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3032 struct nlattr *txsa_list, *rxsc_list; 3033 struct macsec_rx_sc *rx_sc; 3034 struct nlattr *attr; 3035 void *hdr; 3036 int i, j; 3037 3038 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3039 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 3040 if (!hdr) 3041 return -EMSGSIZE; 3042 3043 genl_dump_check_consistent(cb, hdr); 3044 3045 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 3046 goto nla_put_failure; 3047 3048 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD); 3049 if (!attr) 3050 goto nla_put_failure; 3051 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload)) 3052 goto nla_put_failure; 3053 nla_nest_end(skb, attr); 3054 3055 if (nla_put_secy(secy, skb)) 3056 goto nla_put_failure; 3057 3058 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS); 3059 if (!attr) 3060 goto nla_put_failure; 3061 3062 get_tx_sc_stats(dev, &tx_sc_stats); 3063 if (copy_tx_sc_stats(skb, &tx_sc_stats)) { 3064 nla_nest_cancel(skb, attr); 3065 goto nla_put_failure; 3066 } 3067 nla_nest_end(skb, attr); 3068 3069 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS); 3070 if (!attr) 3071 goto nla_put_failure; 3072 get_secy_stats(dev, &dev_stats); 3073 if (copy_secy_stats(skb, &dev_stats)) { 3074 nla_nest_cancel(skb, attr); 3075 goto nla_put_failure; 3076 } 3077 nla_nest_end(skb, attr); 3078 3079 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST); 3080 if (!txsa_list) 3081 goto nla_put_failure; 3082 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 3083 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 3084 struct nlattr *txsa_nest; 3085 u64 pn; 3086 int pn_len; 3087 3088 if (!tx_sa) 3089 continue; 3090 3091 txsa_nest = nla_nest_start_noflag(skb, j++); 3092 if (!txsa_nest) { 3093 nla_nest_cancel(skb, txsa_list); 3094 goto nla_put_failure; 3095 } 3096 3097 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS); 3098 if (!attr) { 3099 nla_nest_cancel(skb, txsa_nest); 3100 nla_nest_cancel(skb, txsa_list); 3101 goto nla_put_failure; 3102 } 3103 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats)); 3104 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats); 3105 if (copy_tx_sa_stats(skb, &tx_sa_stats)) { 3106 nla_nest_cancel(skb, attr); 3107 nla_nest_cancel(skb, txsa_nest); 3108 nla_nest_cancel(skb, txsa_list); 3109 goto nla_put_failure; 3110 } 3111 nla_nest_end(skb, attr); 3112 3113 if (secy->xpn) { 3114 pn = tx_sa->next_pn; 3115 pn_len = MACSEC_XPN_PN_LEN; 3116 } else { 3117 pn = tx_sa->next_pn_halves.lower; 3118 pn_len = MACSEC_DEFAULT_PN_LEN; 3119 } 3120 3121 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3122 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3123 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 3124 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) || 3125 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 3126 nla_nest_cancel(skb, txsa_nest); 3127 nla_nest_cancel(skb, txsa_list); 3128 goto nla_put_failure; 3129 } 3130 3131 nla_nest_end(skb, txsa_nest); 3132 } 3133 nla_nest_end(skb, txsa_list); 3134 3135 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST); 3136 if (!rxsc_list) 3137 goto nla_put_failure; 3138 3139 j = 1; 3140 for_each_rxsc_rtnl(secy, rx_sc) { 3141 int k; 3142 struct nlattr *rxsa_list; 3143 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++); 3144 3145 if (!rxsc_nest) { 3146 nla_nest_cancel(skb, rxsc_list); 3147 goto nla_put_failure; 3148 } 3149 3150 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 3151 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 3152 MACSEC_RXSC_ATTR_PAD)) { 3153 nla_nest_cancel(skb, rxsc_nest); 3154 nla_nest_cancel(skb, rxsc_list); 3155 goto nla_put_failure; 3156 } 3157 3158 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS); 3159 if (!attr) { 3160 nla_nest_cancel(skb, rxsc_nest); 3161 nla_nest_cancel(skb, rxsc_list); 3162 goto nla_put_failure; 3163 } 3164 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats)); 3165 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats); 3166 if (copy_rx_sc_stats(skb, &rx_sc_stats)) { 3167 nla_nest_cancel(skb, attr); 3168 nla_nest_cancel(skb, rxsc_nest); 3169 nla_nest_cancel(skb, rxsc_list); 3170 goto nla_put_failure; 3171 } 3172 nla_nest_end(skb, attr); 3173 3174 rxsa_list = nla_nest_start_noflag(skb, 3175 MACSEC_RXSC_ATTR_SA_LIST); 3176 if (!rxsa_list) { 3177 nla_nest_cancel(skb, rxsc_nest); 3178 nla_nest_cancel(skb, rxsc_list); 3179 goto nla_put_failure; 3180 } 3181 3182 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 3183 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 3184 struct nlattr *rxsa_nest; 3185 u64 pn; 3186 int pn_len; 3187 3188 if (!rx_sa) 3189 continue; 3190 3191 rxsa_nest = nla_nest_start_noflag(skb, k++); 3192 if (!rxsa_nest) { 3193 nla_nest_cancel(skb, rxsa_list); 3194 nla_nest_cancel(skb, rxsc_nest); 3195 nla_nest_cancel(skb, rxsc_list); 3196 goto nla_put_failure; 3197 } 3198 3199 attr = nla_nest_start_noflag(skb, 3200 MACSEC_SA_ATTR_STATS); 3201 if (!attr) { 3202 nla_nest_cancel(skb, rxsa_list); 3203 nla_nest_cancel(skb, rxsc_nest); 3204 nla_nest_cancel(skb, rxsc_list); 3205 goto nla_put_failure; 3206 } 3207 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats)); 3208 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats); 3209 if (copy_rx_sa_stats(skb, &rx_sa_stats)) { 3210 nla_nest_cancel(skb, attr); 3211 nla_nest_cancel(skb, rxsa_list); 3212 nla_nest_cancel(skb, rxsc_nest); 3213 nla_nest_cancel(skb, rxsc_list); 3214 goto nla_put_failure; 3215 } 3216 nla_nest_end(skb, attr); 3217 3218 if (secy->xpn) { 3219 pn = rx_sa->next_pn; 3220 pn_len = MACSEC_XPN_PN_LEN; 3221 } else { 3222 pn = rx_sa->next_pn_halves.lower; 3223 pn_len = MACSEC_DEFAULT_PN_LEN; 3224 } 3225 3226 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3227 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3228 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 3229 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) || 3230 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 3231 nla_nest_cancel(skb, rxsa_nest); 3232 nla_nest_cancel(skb, rxsc_nest); 3233 nla_nest_cancel(skb, rxsc_list); 3234 goto nla_put_failure; 3235 } 3236 nla_nest_end(skb, rxsa_nest); 3237 } 3238 3239 nla_nest_end(skb, rxsa_list); 3240 nla_nest_end(skb, rxsc_nest); 3241 } 3242 3243 nla_nest_end(skb, rxsc_list); 3244 3245 genlmsg_end(skb, hdr); 3246 3247 return 0; 3248 3249 nla_put_failure: 3250 genlmsg_cancel(skb, hdr); 3251 return -EMSGSIZE; 3252 } 3253 3254 static int macsec_generation = 1; /* protected by RTNL */ 3255 3256 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 3257 { 3258 struct net *net = sock_net(skb->sk); 3259 struct net_device *dev; 3260 int dev_idx, d; 3261 3262 dev_idx = cb->args[0]; 3263 3264 d = 0; 3265 rtnl_lock(); 3266 3267 cb->seq = macsec_generation; 3268 3269 for_each_netdev(net, dev) { 3270 struct macsec_secy *secy; 3271 3272 if (d < dev_idx) 3273 goto next; 3274 3275 if (!netif_is_macsec(dev)) 3276 goto next; 3277 3278 secy = &macsec_priv(dev)->secy; 3279 if (dump_secy(secy, dev, skb, cb) < 0) 3280 goto done; 3281 next: 3282 d++; 3283 } 3284 3285 done: 3286 rtnl_unlock(); 3287 cb->args[0] = d; 3288 return skb->len; 3289 } 3290 3291 static const struct genl_small_ops macsec_genl_ops[] = { 3292 { 3293 .cmd = MACSEC_CMD_GET_TXSC, 3294 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3295 .dumpit = macsec_dump_txsc, 3296 }, 3297 { 3298 .cmd = MACSEC_CMD_ADD_RXSC, 3299 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3300 .doit = macsec_add_rxsc, 3301 .flags = GENL_ADMIN_PERM, 3302 }, 3303 { 3304 .cmd = MACSEC_CMD_DEL_RXSC, 3305 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3306 .doit = macsec_del_rxsc, 3307 .flags = GENL_ADMIN_PERM, 3308 }, 3309 { 3310 .cmd = MACSEC_CMD_UPD_RXSC, 3311 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3312 .doit = macsec_upd_rxsc, 3313 .flags = GENL_ADMIN_PERM, 3314 }, 3315 { 3316 .cmd = MACSEC_CMD_ADD_TXSA, 3317 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3318 .doit = macsec_add_txsa, 3319 .flags = GENL_ADMIN_PERM, 3320 }, 3321 { 3322 .cmd = MACSEC_CMD_DEL_TXSA, 3323 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3324 .doit = macsec_del_txsa, 3325 .flags = GENL_ADMIN_PERM, 3326 }, 3327 { 3328 .cmd = MACSEC_CMD_UPD_TXSA, 3329 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3330 .doit = macsec_upd_txsa, 3331 .flags = GENL_ADMIN_PERM, 3332 }, 3333 { 3334 .cmd = MACSEC_CMD_ADD_RXSA, 3335 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3336 .doit = macsec_add_rxsa, 3337 .flags = GENL_ADMIN_PERM, 3338 }, 3339 { 3340 .cmd = MACSEC_CMD_DEL_RXSA, 3341 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3342 .doit = macsec_del_rxsa, 3343 .flags = GENL_ADMIN_PERM, 3344 }, 3345 { 3346 .cmd = MACSEC_CMD_UPD_RXSA, 3347 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3348 .doit = macsec_upd_rxsa, 3349 .flags = GENL_ADMIN_PERM, 3350 }, 3351 { 3352 .cmd = MACSEC_CMD_UPD_OFFLOAD, 3353 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3354 .doit = macsec_upd_offload, 3355 .flags = GENL_ADMIN_PERM, 3356 }, 3357 }; 3358 3359 static struct genl_family macsec_fam __ro_after_init = { 3360 .name = MACSEC_GENL_NAME, 3361 .hdrsize = 0, 3362 .version = MACSEC_GENL_VERSION, 3363 .maxattr = MACSEC_ATTR_MAX, 3364 .policy = macsec_genl_policy, 3365 .netnsok = true, 3366 .module = THIS_MODULE, 3367 .small_ops = macsec_genl_ops, 3368 .n_small_ops = ARRAY_SIZE(macsec_genl_ops), 3369 }; 3370 3371 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 3372 struct net_device *dev) 3373 { 3374 struct macsec_dev *macsec = netdev_priv(dev); 3375 struct macsec_secy *secy = &macsec->secy; 3376 struct pcpu_secy_stats *secy_stats; 3377 int ret, len; 3378 3379 if (macsec_is_offloaded(netdev_priv(dev))) { 3380 skb->dev = macsec->real_dev; 3381 return dev_queue_xmit(skb); 3382 } 3383 3384 /* 10.5 */ 3385 if (!secy->protect_frames) { 3386 secy_stats = this_cpu_ptr(macsec->stats); 3387 u64_stats_update_begin(&secy_stats->syncp); 3388 secy_stats->stats.OutPktsUntagged++; 3389 u64_stats_update_end(&secy_stats->syncp); 3390 skb->dev = macsec->real_dev; 3391 len = skb->len; 3392 ret = dev_queue_xmit(skb); 3393 count_tx(dev, ret, len); 3394 return ret; 3395 } 3396 3397 if (!secy->operational) { 3398 kfree_skb(skb); 3399 dev->stats.tx_dropped++; 3400 return NETDEV_TX_OK; 3401 } 3402 3403 skb = macsec_encrypt(skb, dev); 3404 if (IS_ERR(skb)) { 3405 if (PTR_ERR(skb) != -EINPROGRESS) 3406 dev->stats.tx_dropped++; 3407 return NETDEV_TX_OK; 3408 } 3409 3410 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 3411 3412 macsec_encrypt_finish(skb, dev); 3413 len = skb->len; 3414 ret = dev_queue_xmit(skb); 3415 count_tx(dev, ret, len); 3416 return ret; 3417 } 3418 3419 #define SW_MACSEC_FEATURES \ 3420 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 3421 3422 /* If h/w offloading is enabled, use real device features save for 3423 * VLAN_FEATURES - they require additional ops 3424 * HW_MACSEC - no reason to report it 3425 */ 3426 #define REAL_DEV_FEATURES(dev) \ 3427 ((dev)->features & ~(NETIF_F_VLAN_FEATURES | NETIF_F_HW_MACSEC)) 3428 3429 static int macsec_dev_init(struct net_device *dev) 3430 { 3431 struct macsec_dev *macsec = macsec_priv(dev); 3432 struct net_device *real_dev = macsec->real_dev; 3433 int err; 3434 3435 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 3436 if (!dev->tstats) 3437 return -ENOMEM; 3438 3439 err = gro_cells_init(&macsec->gro_cells, dev); 3440 if (err) { 3441 free_percpu(dev->tstats); 3442 return err; 3443 } 3444 3445 if (macsec_is_offloaded(macsec)) { 3446 dev->features = REAL_DEV_FEATURES(real_dev); 3447 } else { 3448 dev->features = real_dev->features & SW_MACSEC_FEATURES; 3449 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 3450 } 3451 3452 dev->needed_headroom = real_dev->needed_headroom + 3453 MACSEC_NEEDED_HEADROOM; 3454 dev->needed_tailroom = real_dev->needed_tailroom + 3455 MACSEC_NEEDED_TAILROOM; 3456 3457 if (is_zero_ether_addr(dev->dev_addr)) 3458 eth_hw_addr_inherit(dev, real_dev); 3459 if (is_zero_ether_addr(dev->broadcast)) 3460 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 3461 3462 return 0; 3463 } 3464 3465 static void macsec_dev_uninit(struct net_device *dev) 3466 { 3467 struct macsec_dev *macsec = macsec_priv(dev); 3468 3469 gro_cells_destroy(&macsec->gro_cells); 3470 free_percpu(dev->tstats); 3471 } 3472 3473 static netdev_features_t macsec_fix_features(struct net_device *dev, 3474 netdev_features_t features) 3475 { 3476 struct macsec_dev *macsec = macsec_priv(dev); 3477 struct net_device *real_dev = macsec->real_dev; 3478 3479 if (macsec_is_offloaded(macsec)) 3480 return REAL_DEV_FEATURES(real_dev); 3481 3482 features &= (real_dev->features & SW_MACSEC_FEATURES) | 3483 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 3484 features |= NETIF_F_LLTX; 3485 3486 return features; 3487 } 3488 3489 static int macsec_dev_open(struct net_device *dev) 3490 { 3491 struct macsec_dev *macsec = macsec_priv(dev); 3492 struct net_device *real_dev = macsec->real_dev; 3493 int err; 3494 3495 err = dev_uc_add(real_dev, dev->dev_addr); 3496 if (err < 0) 3497 return err; 3498 3499 if (dev->flags & IFF_ALLMULTI) { 3500 err = dev_set_allmulti(real_dev, 1); 3501 if (err < 0) 3502 goto del_unicast; 3503 } 3504 3505 if (dev->flags & IFF_PROMISC) { 3506 err = dev_set_promiscuity(real_dev, 1); 3507 if (err < 0) 3508 goto clear_allmulti; 3509 } 3510 3511 /* If h/w offloading is available, propagate to the device */ 3512 if (macsec_is_offloaded(macsec)) { 3513 const struct macsec_ops *ops; 3514 struct macsec_context ctx; 3515 3516 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3517 if (!ops) { 3518 err = -EOPNOTSUPP; 3519 goto clear_allmulti; 3520 } 3521 3522 ctx.secy = &macsec->secy; 3523 err = macsec_offload(ops->mdo_dev_open, &ctx); 3524 if (err) 3525 goto clear_allmulti; 3526 } 3527 3528 if (netif_carrier_ok(real_dev)) 3529 netif_carrier_on(dev); 3530 3531 return 0; 3532 clear_allmulti: 3533 if (dev->flags & IFF_ALLMULTI) 3534 dev_set_allmulti(real_dev, -1); 3535 del_unicast: 3536 dev_uc_del(real_dev, dev->dev_addr); 3537 netif_carrier_off(dev); 3538 return err; 3539 } 3540 3541 static int macsec_dev_stop(struct net_device *dev) 3542 { 3543 struct macsec_dev *macsec = macsec_priv(dev); 3544 struct net_device *real_dev = macsec->real_dev; 3545 3546 netif_carrier_off(dev); 3547 3548 /* If h/w offloading is available, propagate to the device */ 3549 if (macsec_is_offloaded(macsec)) { 3550 const struct macsec_ops *ops; 3551 struct macsec_context ctx; 3552 3553 ops = macsec_get_ops(macsec, &ctx); 3554 if (ops) { 3555 ctx.secy = &macsec->secy; 3556 macsec_offload(ops->mdo_dev_stop, &ctx); 3557 } 3558 } 3559 3560 dev_mc_unsync(real_dev, dev); 3561 dev_uc_unsync(real_dev, dev); 3562 3563 if (dev->flags & IFF_ALLMULTI) 3564 dev_set_allmulti(real_dev, -1); 3565 3566 if (dev->flags & IFF_PROMISC) 3567 dev_set_promiscuity(real_dev, -1); 3568 3569 dev_uc_del(real_dev, dev->dev_addr); 3570 3571 return 0; 3572 } 3573 3574 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 3575 { 3576 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3577 3578 if (!(dev->flags & IFF_UP)) 3579 return; 3580 3581 if (change & IFF_ALLMULTI) 3582 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 3583 3584 if (change & IFF_PROMISC) 3585 dev_set_promiscuity(real_dev, 3586 dev->flags & IFF_PROMISC ? 1 : -1); 3587 } 3588 3589 static void macsec_dev_set_rx_mode(struct net_device *dev) 3590 { 3591 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3592 3593 dev_mc_sync(real_dev, dev); 3594 dev_uc_sync(real_dev, dev); 3595 } 3596 3597 static int macsec_set_mac_address(struct net_device *dev, void *p) 3598 { 3599 struct macsec_dev *macsec = macsec_priv(dev); 3600 struct net_device *real_dev = macsec->real_dev; 3601 struct sockaddr *addr = p; 3602 int err; 3603 3604 if (!is_valid_ether_addr(addr->sa_data)) 3605 return -EADDRNOTAVAIL; 3606 3607 if (!(dev->flags & IFF_UP)) 3608 goto out; 3609 3610 err = dev_uc_add(real_dev, addr->sa_data); 3611 if (err < 0) 3612 return err; 3613 3614 dev_uc_del(real_dev, dev->dev_addr); 3615 3616 out: 3617 eth_hw_addr_set(dev, addr->sa_data); 3618 macsec->secy.sci = dev_to_sci(dev, MACSEC_PORT_ES); 3619 3620 /* If h/w offloading is available, propagate to the device */ 3621 if (macsec_is_offloaded(macsec)) { 3622 const struct macsec_ops *ops; 3623 struct macsec_context ctx; 3624 3625 ops = macsec_get_ops(macsec, &ctx); 3626 if (ops) { 3627 ctx.secy = &macsec->secy; 3628 macsec_offload(ops->mdo_upd_secy, &ctx); 3629 } 3630 } 3631 3632 return 0; 3633 } 3634 3635 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 3636 { 3637 struct macsec_dev *macsec = macsec_priv(dev); 3638 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 3639 3640 if (macsec->real_dev->mtu - extra < new_mtu) 3641 return -ERANGE; 3642 3643 dev->mtu = new_mtu; 3644 3645 return 0; 3646 } 3647 3648 static void macsec_get_stats64(struct net_device *dev, 3649 struct rtnl_link_stats64 *s) 3650 { 3651 if (!dev->tstats) 3652 return; 3653 3654 dev_fetch_sw_netstats(s, dev->tstats); 3655 3656 s->rx_dropped = dev->stats.rx_dropped; 3657 s->tx_dropped = dev->stats.tx_dropped; 3658 } 3659 3660 static int macsec_get_iflink(const struct net_device *dev) 3661 { 3662 return macsec_priv(dev)->real_dev->ifindex; 3663 } 3664 3665 static const struct net_device_ops macsec_netdev_ops = { 3666 .ndo_init = macsec_dev_init, 3667 .ndo_uninit = macsec_dev_uninit, 3668 .ndo_open = macsec_dev_open, 3669 .ndo_stop = macsec_dev_stop, 3670 .ndo_fix_features = macsec_fix_features, 3671 .ndo_change_mtu = macsec_change_mtu, 3672 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 3673 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 3674 .ndo_set_mac_address = macsec_set_mac_address, 3675 .ndo_start_xmit = macsec_start_xmit, 3676 .ndo_get_stats64 = macsec_get_stats64, 3677 .ndo_get_iflink = macsec_get_iflink, 3678 }; 3679 3680 static const struct device_type macsec_type = { 3681 .name = "macsec", 3682 }; 3683 3684 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 3685 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 3686 [IFLA_MACSEC_PORT] = { .type = NLA_U16 }, 3687 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 3688 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 3689 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 3690 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 3691 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 3692 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 3693 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 3694 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 3695 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 3696 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 3697 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 3698 }; 3699 3700 static void macsec_free_netdev(struct net_device *dev) 3701 { 3702 struct macsec_dev *macsec = macsec_priv(dev); 3703 3704 free_percpu(macsec->stats); 3705 free_percpu(macsec->secy.tx_sc.stats); 3706 3707 } 3708 3709 static void macsec_setup(struct net_device *dev) 3710 { 3711 ether_setup(dev); 3712 dev->min_mtu = 0; 3713 dev->max_mtu = ETH_MAX_MTU; 3714 dev->priv_flags |= IFF_NO_QUEUE; 3715 dev->netdev_ops = &macsec_netdev_ops; 3716 dev->needs_free_netdev = true; 3717 dev->priv_destructor = macsec_free_netdev; 3718 SET_NETDEV_DEVTYPE(dev, &macsec_type); 3719 3720 eth_zero_addr(dev->broadcast); 3721 } 3722 3723 static int macsec_changelink_common(struct net_device *dev, 3724 struct nlattr *data[]) 3725 { 3726 struct macsec_secy *secy; 3727 struct macsec_tx_sc *tx_sc; 3728 3729 secy = &macsec_priv(dev)->secy; 3730 tx_sc = &secy->tx_sc; 3731 3732 if (data[IFLA_MACSEC_ENCODING_SA]) { 3733 struct macsec_tx_sa *tx_sa; 3734 3735 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3736 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 3737 3738 secy->operational = tx_sa && tx_sa->active; 3739 } 3740 3741 if (data[IFLA_MACSEC_WINDOW]) 3742 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3743 3744 if (data[IFLA_MACSEC_ENCRYPT]) 3745 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3746 3747 if (data[IFLA_MACSEC_PROTECT]) 3748 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3749 3750 if (data[IFLA_MACSEC_INC_SCI]) 3751 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3752 3753 if (data[IFLA_MACSEC_ES]) 3754 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3755 3756 if (data[IFLA_MACSEC_SCB]) 3757 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3758 3759 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3760 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3761 3762 if (data[IFLA_MACSEC_VALIDATION]) 3763 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3764 3765 if (data[IFLA_MACSEC_CIPHER_SUITE]) { 3766 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) { 3767 case MACSEC_CIPHER_ID_GCM_AES_128: 3768 case MACSEC_DEFAULT_CIPHER_ID: 3769 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3770 secy->xpn = false; 3771 break; 3772 case MACSEC_CIPHER_ID_GCM_AES_256: 3773 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3774 secy->xpn = false; 3775 break; 3776 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 3777 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3778 secy->xpn = true; 3779 break; 3780 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 3781 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3782 secy->xpn = true; 3783 break; 3784 default: 3785 return -EINVAL; 3786 } 3787 } 3788 3789 return 0; 3790 } 3791 3792 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3793 struct nlattr *data[], 3794 struct netlink_ext_ack *extack) 3795 { 3796 struct macsec_dev *macsec = macsec_priv(dev); 3797 struct macsec_tx_sc tx_sc; 3798 struct macsec_secy secy; 3799 int ret; 3800 3801 if (!data) 3802 return 0; 3803 3804 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3805 data[IFLA_MACSEC_ICV_LEN] || 3806 data[IFLA_MACSEC_SCI] || 3807 data[IFLA_MACSEC_PORT]) 3808 return -EINVAL; 3809 3810 /* Keep a copy of unmodified secy and tx_sc, in case the offload 3811 * propagation fails, to revert macsec_changelink_common. 3812 */ 3813 memcpy(&secy, &macsec->secy, sizeof(secy)); 3814 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc)); 3815 3816 ret = macsec_changelink_common(dev, data); 3817 if (ret) 3818 return ret; 3819 3820 /* If h/w offloading is available, propagate to the device */ 3821 if (macsec_is_offloaded(macsec)) { 3822 const struct macsec_ops *ops; 3823 struct macsec_context ctx; 3824 int ret; 3825 3826 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3827 if (!ops) { 3828 ret = -EOPNOTSUPP; 3829 goto cleanup; 3830 } 3831 3832 ctx.secy = &macsec->secy; 3833 ret = macsec_offload(ops->mdo_upd_secy, &ctx); 3834 if (ret) 3835 goto cleanup; 3836 } 3837 3838 return 0; 3839 3840 cleanup: 3841 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc)); 3842 memcpy(&macsec->secy, &secy, sizeof(secy)); 3843 3844 return ret; 3845 } 3846 3847 static void macsec_del_dev(struct macsec_dev *macsec) 3848 { 3849 int i; 3850 3851 while (macsec->secy.rx_sc) { 3852 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 3853 3854 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 3855 free_rx_sc(rx_sc); 3856 } 3857 3858 for (i = 0; i < MACSEC_NUM_AN; i++) { 3859 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 3860 3861 if (sa) { 3862 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 3863 clear_tx_sa(sa); 3864 } 3865 } 3866 } 3867 3868 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 3869 { 3870 struct macsec_dev *macsec = macsec_priv(dev); 3871 struct net_device *real_dev = macsec->real_dev; 3872 3873 unregister_netdevice_queue(dev, head); 3874 list_del_rcu(&macsec->secys); 3875 macsec_del_dev(macsec); 3876 netdev_upper_dev_unlink(real_dev, dev); 3877 3878 macsec_generation++; 3879 } 3880 3881 static void macsec_dellink(struct net_device *dev, struct list_head *head) 3882 { 3883 struct macsec_dev *macsec = macsec_priv(dev); 3884 struct net_device *real_dev = macsec->real_dev; 3885 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3886 3887 /* If h/w offloading is available, propagate to the device */ 3888 if (macsec_is_offloaded(macsec)) { 3889 const struct macsec_ops *ops; 3890 struct macsec_context ctx; 3891 3892 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3893 if (ops) { 3894 ctx.secy = &macsec->secy; 3895 macsec_offload(ops->mdo_del_secy, &ctx); 3896 } 3897 } 3898 3899 macsec_common_dellink(dev, head); 3900 3901 if (list_empty(&rxd->secys)) { 3902 netdev_rx_handler_unregister(real_dev); 3903 kfree(rxd); 3904 } 3905 } 3906 3907 static int register_macsec_dev(struct net_device *real_dev, 3908 struct net_device *dev) 3909 { 3910 struct macsec_dev *macsec = macsec_priv(dev); 3911 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3912 3913 if (!rxd) { 3914 int err; 3915 3916 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 3917 if (!rxd) 3918 return -ENOMEM; 3919 3920 INIT_LIST_HEAD(&rxd->secys); 3921 3922 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 3923 rxd); 3924 if (err < 0) { 3925 kfree(rxd); 3926 return err; 3927 } 3928 } 3929 3930 list_add_tail_rcu(&macsec->secys, &rxd->secys); 3931 return 0; 3932 } 3933 3934 static bool sci_exists(struct net_device *dev, sci_t sci) 3935 { 3936 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 3937 struct macsec_dev *macsec; 3938 3939 list_for_each_entry(macsec, &rxd->secys, secys) { 3940 if (macsec->secy.sci == sci) 3941 return true; 3942 } 3943 3944 return false; 3945 } 3946 3947 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 3948 { 3949 struct macsec_dev *macsec = macsec_priv(dev); 3950 struct macsec_secy *secy = &macsec->secy; 3951 3952 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 3953 if (!macsec->stats) 3954 return -ENOMEM; 3955 3956 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 3957 if (!secy->tx_sc.stats) { 3958 free_percpu(macsec->stats); 3959 return -ENOMEM; 3960 } 3961 3962 if (sci == MACSEC_UNDEF_SCI) 3963 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3964 3965 secy->netdev = dev; 3966 secy->operational = true; 3967 secy->key_len = DEFAULT_SAK_LEN; 3968 secy->icv_len = icv_len; 3969 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 3970 secy->protect_frames = true; 3971 secy->replay_protect = false; 3972 secy->xpn = DEFAULT_XPN; 3973 3974 secy->sci = sci; 3975 secy->tx_sc.active = true; 3976 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 3977 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 3978 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 3979 secy->tx_sc.end_station = false; 3980 secy->tx_sc.scb = false; 3981 3982 return 0; 3983 } 3984 3985 static struct lock_class_key macsec_netdev_addr_lock_key; 3986 3987 static int macsec_newlink(struct net *net, struct net_device *dev, 3988 struct nlattr *tb[], struct nlattr *data[], 3989 struct netlink_ext_ack *extack) 3990 { 3991 struct macsec_dev *macsec = macsec_priv(dev); 3992 rx_handler_func_t *rx_handler; 3993 u8 icv_len = DEFAULT_ICV_LEN; 3994 struct net_device *real_dev; 3995 int err, mtu; 3996 sci_t sci; 3997 3998 if (!tb[IFLA_LINK]) 3999 return -EINVAL; 4000 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 4001 if (!real_dev) 4002 return -ENODEV; 4003 if (real_dev->type != ARPHRD_ETHER) 4004 return -EINVAL; 4005 4006 dev->priv_flags |= IFF_MACSEC; 4007 4008 macsec->real_dev = real_dev; 4009 4010 if (data && data[IFLA_MACSEC_OFFLOAD]) 4011 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]); 4012 else 4013 /* MACsec offloading is off by default */ 4014 macsec->offload = MACSEC_OFFLOAD_OFF; 4015 4016 /* Check if the offloading mode is supported by the underlying layers */ 4017 if (macsec->offload != MACSEC_OFFLOAD_OFF && 4018 !macsec_check_offload(macsec->offload, macsec)) 4019 return -EOPNOTSUPP; 4020 4021 if (data && data[IFLA_MACSEC_ICV_LEN]) 4022 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4023 mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 4024 if (mtu < 0) 4025 dev->mtu = 0; 4026 else 4027 dev->mtu = mtu; 4028 4029 rx_handler = rtnl_dereference(real_dev->rx_handler); 4030 if (rx_handler && rx_handler != macsec_handle_frame) 4031 return -EBUSY; 4032 4033 err = register_netdevice(dev); 4034 if (err < 0) 4035 return err; 4036 4037 netdev_lockdep_set_classes(dev); 4038 lockdep_set_class(&dev->addr_list_lock, 4039 &macsec_netdev_addr_lock_key); 4040 4041 err = netdev_upper_dev_link(real_dev, dev, extack); 4042 if (err < 0) 4043 goto unregister; 4044 4045 /* need to be already registered so that ->init has run and 4046 * the MAC addr is set 4047 */ 4048 if (data && data[IFLA_MACSEC_SCI]) 4049 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 4050 else if (data && data[IFLA_MACSEC_PORT]) 4051 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 4052 else 4053 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4054 4055 if (rx_handler && sci_exists(real_dev, sci)) { 4056 err = -EBUSY; 4057 goto unlink; 4058 } 4059 4060 err = macsec_add_dev(dev, sci, icv_len); 4061 if (err) 4062 goto unlink; 4063 4064 if (data) { 4065 err = macsec_changelink_common(dev, data); 4066 if (err) 4067 goto del_dev; 4068 } 4069 4070 /* If h/w offloading is available, propagate to the device */ 4071 if (macsec_is_offloaded(macsec)) { 4072 const struct macsec_ops *ops; 4073 struct macsec_context ctx; 4074 4075 ops = macsec_get_ops(macsec, &ctx); 4076 if (ops) { 4077 ctx.secy = &macsec->secy; 4078 err = macsec_offload(ops->mdo_add_secy, &ctx); 4079 if (err) 4080 goto del_dev; 4081 } 4082 } 4083 4084 err = register_macsec_dev(real_dev, dev); 4085 if (err < 0) 4086 goto del_dev; 4087 4088 netif_stacked_transfer_operstate(real_dev, dev); 4089 linkwatch_fire_event(dev); 4090 4091 macsec_generation++; 4092 4093 return 0; 4094 4095 del_dev: 4096 macsec_del_dev(macsec); 4097 unlink: 4098 netdev_upper_dev_unlink(real_dev, dev); 4099 unregister: 4100 unregister_netdevice(dev); 4101 return err; 4102 } 4103 4104 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], 4105 struct netlink_ext_ack *extack) 4106 { 4107 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 4108 u8 icv_len = DEFAULT_ICV_LEN; 4109 int flag; 4110 bool es, scb, sci; 4111 4112 if (!data) 4113 return 0; 4114 4115 if (data[IFLA_MACSEC_CIPHER_SUITE]) 4116 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 4117 4118 if (data[IFLA_MACSEC_ICV_LEN]) { 4119 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4120 if (icv_len != DEFAULT_ICV_LEN) { 4121 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 4122 struct crypto_aead *dummy_tfm; 4123 4124 dummy_tfm = macsec_alloc_tfm(dummy_key, 4125 DEFAULT_SAK_LEN, 4126 icv_len); 4127 if (IS_ERR(dummy_tfm)) 4128 return PTR_ERR(dummy_tfm); 4129 crypto_free_aead(dummy_tfm); 4130 } 4131 } 4132 4133 switch (csid) { 4134 case MACSEC_CIPHER_ID_GCM_AES_128: 4135 case MACSEC_CIPHER_ID_GCM_AES_256: 4136 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 4137 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 4138 case MACSEC_DEFAULT_CIPHER_ID: 4139 if (icv_len < MACSEC_MIN_ICV_LEN || 4140 icv_len > MACSEC_STD_ICV_LEN) 4141 return -EINVAL; 4142 break; 4143 default: 4144 return -EINVAL; 4145 } 4146 4147 if (data[IFLA_MACSEC_ENCODING_SA]) { 4148 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 4149 return -EINVAL; 4150 } 4151 4152 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 4153 flag < IFLA_MACSEC_VALIDATION; 4154 flag++) { 4155 if (data[flag]) { 4156 if (nla_get_u8(data[flag]) > 1) 4157 return -EINVAL; 4158 } 4159 } 4160 4161 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 4162 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 4163 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 4164 4165 if ((sci && (scb || es)) || (scb && es)) 4166 return -EINVAL; 4167 4168 if (data[IFLA_MACSEC_VALIDATION] && 4169 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 4170 return -EINVAL; 4171 4172 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 4173 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 4174 !data[IFLA_MACSEC_WINDOW]) 4175 return -EINVAL; 4176 4177 return 0; 4178 } 4179 4180 static struct net *macsec_get_link_net(const struct net_device *dev) 4181 { 4182 return dev_net(macsec_priv(dev)->real_dev); 4183 } 4184 4185 static size_t macsec_get_size(const struct net_device *dev) 4186 { 4187 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ 4188 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ 4189 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ 4190 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ 4191 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ 4192 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ 4193 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ 4194 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ 4195 nla_total_size(1) + /* IFLA_MACSEC_ES */ 4196 nla_total_size(1) + /* IFLA_MACSEC_SCB */ 4197 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ 4198 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ 4199 0; 4200 } 4201 4202 static int macsec_fill_info(struct sk_buff *skb, 4203 const struct net_device *dev) 4204 { 4205 struct macsec_secy *secy = &macsec_priv(dev)->secy; 4206 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 4207 u64 csid; 4208 4209 switch (secy->key_len) { 4210 case MACSEC_GCM_AES_128_SAK_LEN: 4211 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 4212 break; 4213 case MACSEC_GCM_AES_256_SAK_LEN: 4214 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 4215 break; 4216 default: 4217 goto nla_put_failure; 4218 } 4219 4220 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 4221 IFLA_MACSEC_PAD) || 4222 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 4223 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 4224 csid, IFLA_MACSEC_PAD) || 4225 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 4226 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 4227 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 4228 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 4229 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 4230 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 4231 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 4232 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 4233 0) 4234 goto nla_put_failure; 4235 4236 if (secy->replay_protect) { 4237 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 4238 goto nla_put_failure; 4239 } 4240 4241 return 0; 4242 4243 nla_put_failure: 4244 return -EMSGSIZE; 4245 } 4246 4247 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 4248 .kind = "macsec", 4249 .priv_size = sizeof(struct macsec_dev), 4250 .maxtype = IFLA_MACSEC_MAX, 4251 .policy = macsec_rtnl_policy, 4252 .setup = macsec_setup, 4253 .validate = macsec_validate_attr, 4254 .newlink = macsec_newlink, 4255 .changelink = macsec_changelink, 4256 .dellink = macsec_dellink, 4257 .get_size = macsec_get_size, 4258 .fill_info = macsec_fill_info, 4259 .get_link_net = macsec_get_link_net, 4260 }; 4261 4262 static bool is_macsec_master(struct net_device *dev) 4263 { 4264 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 4265 } 4266 4267 static int macsec_notify(struct notifier_block *this, unsigned long event, 4268 void *ptr) 4269 { 4270 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 4271 LIST_HEAD(head); 4272 4273 if (!is_macsec_master(real_dev)) 4274 return NOTIFY_DONE; 4275 4276 switch (event) { 4277 case NETDEV_DOWN: 4278 case NETDEV_UP: 4279 case NETDEV_CHANGE: { 4280 struct macsec_dev *m, *n; 4281 struct macsec_rxh_data *rxd; 4282 4283 rxd = macsec_data_rtnl(real_dev); 4284 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4285 struct net_device *dev = m->secy.netdev; 4286 4287 netif_stacked_transfer_operstate(real_dev, dev); 4288 } 4289 break; 4290 } 4291 case NETDEV_UNREGISTER: { 4292 struct macsec_dev *m, *n; 4293 struct macsec_rxh_data *rxd; 4294 4295 rxd = macsec_data_rtnl(real_dev); 4296 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4297 macsec_common_dellink(m->secy.netdev, &head); 4298 } 4299 4300 netdev_rx_handler_unregister(real_dev); 4301 kfree(rxd); 4302 4303 unregister_netdevice_many(&head); 4304 break; 4305 } 4306 case NETDEV_CHANGEMTU: { 4307 struct macsec_dev *m; 4308 struct macsec_rxh_data *rxd; 4309 4310 rxd = macsec_data_rtnl(real_dev); 4311 list_for_each_entry(m, &rxd->secys, secys) { 4312 struct net_device *dev = m->secy.netdev; 4313 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 4314 macsec_extra_len(true)); 4315 4316 if (dev->mtu > mtu) 4317 dev_set_mtu(dev, mtu); 4318 } 4319 } 4320 } 4321 4322 return NOTIFY_OK; 4323 } 4324 4325 static struct notifier_block macsec_notifier = { 4326 .notifier_call = macsec_notify, 4327 }; 4328 4329 static int __init macsec_init(void) 4330 { 4331 int err; 4332 4333 pr_info("MACsec IEEE 802.1AE\n"); 4334 err = register_netdevice_notifier(&macsec_notifier); 4335 if (err) 4336 return err; 4337 4338 err = rtnl_link_register(&macsec_link_ops); 4339 if (err) 4340 goto notifier; 4341 4342 err = genl_register_family(&macsec_fam); 4343 if (err) 4344 goto rtnl; 4345 4346 return 0; 4347 4348 rtnl: 4349 rtnl_link_unregister(&macsec_link_ops); 4350 notifier: 4351 unregister_netdevice_notifier(&macsec_notifier); 4352 return err; 4353 } 4354 4355 static void __exit macsec_exit(void) 4356 { 4357 genl_unregister_family(&macsec_fam); 4358 rtnl_link_unregister(&macsec_link_ops); 4359 unregister_netdevice_notifier(&macsec_notifier); 4360 rcu_barrier(); 4361 } 4362 4363 module_init(macsec_init); 4364 module_exit(macsec_exit); 4365 4366 MODULE_ALIAS_RTNL_LINK("macsec"); 4367 MODULE_ALIAS_GENL_FAMILY("macsec"); 4368 4369 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 4370 MODULE_LICENSE("GPL v2"); 4371