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 * @offload: status of offloading on the MACsec device 105 */ 106 struct macsec_dev { 107 struct macsec_secy secy; 108 struct net_device *real_dev; 109 struct pcpu_secy_stats __percpu *stats; 110 struct list_head secys; 111 struct gro_cells gro_cells; 112 enum macsec_offload offload; 113 }; 114 115 /** 116 * struct macsec_rxh_data - rx_handler private argument 117 * @secys: linked list of SecY's on this underlying device 118 */ 119 struct macsec_rxh_data { 120 struct list_head secys; 121 }; 122 123 static struct macsec_dev *macsec_priv(const struct net_device *dev) 124 { 125 return (struct macsec_dev *)netdev_priv(dev); 126 } 127 128 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev) 129 { 130 return rcu_dereference_bh(dev->rx_handler_data); 131 } 132 133 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev) 134 { 135 return rtnl_dereference(dev->rx_handler_data); 136 } 137 138 struct macsec_cb { 139 struct aead_request *req; 140 union { 141 struct macsec_tx_sa *tx_sa; 142 struct macsec_rx_sa *rx_sa; 143 }; 144 u8 assoc_num; 145 bool valid; 146 bool has_sci; 147 }; 148 149 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr) 150 { 151 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr); 152 153 if (!sa || !sa->active) 154 return NULL; 155 156 if (!refcount_inc_not_zero(&sa->refcnt)) 157 return NULL; 158 159 return sa; 160 } 161 162 static void free_rx_sc_rcu(struct rcu_head *head) 163 { 164 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head); 165 166 free_percpu(rx_sc->stats); 167 kfree(rx_sc); 168 } 169 170 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc) 171 { 172 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL; 173 } 174 175 static void macsec_rxsc_put(struct macsec_rx_sc *sc) 176 { 177 if (refcount_dec_and_test(&sc->refcnt)) 178 call_rcu(&sc->rcu_head, free_rx_sc_rcu); 179 } 180 181 static void free_rxsa(struct rcu_head *head) 182 { 183 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu); 184 185 crypto_free_aead(sa->key.tfm); 186 free_percpu(sa->stats); 187 kfree(sa); 188 } 189 190 static void macsec_rxsa_put(struct macsec_rx_sa *sa) 191 { 192 if (refcount_dec_and_test(&sa->refcnt)) 193 call_rcu(&sa->rcu, free_rxsa); 194 } 195 196 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr) 197 { 198 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr); 199 200 if (!sa || !sa->active) 201 return NULL; 202 203 if (!refcount_inc_not_zero(&sa->refcnt)) 204 return NULL; 205 206 return sa; 207 } 208 209 static void free_txsa(struct rcu_head *head) 210 { 211 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu); 212 213 crypto_free_aead(sa->key.tfm); 214 free_percpu(sa->stats); 215 kfree(sa); 216 } 217 218 static void macsec_txsa_put(struct macsec_tx_sa *sa) 219 { 220 if (refcount_dec_and_test(&sa->refcnt)) 221 call_rcu(&sa->rcu, free_txsa); 222 } 223 224 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) 225 { 226 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); 227 return (struct macsec_cb *)skb->cb; 228 } 229 230 #define MACSEC_PORT_ES (htons(0x0001)) 231 #define MACSEC_PORT_SCB (0x0000) 232 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL) 233 #define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff) 234 235 #define MACSEC_GCM_AES_128_SAK_LEN 16 236 #define MACSEC_GCM_AES_256_SAK_LEN 32 237 238 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN 239 #define DEFAULT_XPN false 240 #define DEFAULT_SEND_SCI true 241 #define DEFAULT_ENCRYPT false 242 #define DEFAULT_ENCODING_SA 0 243 244 static bool send_sci(const struct macsec_secy *secy) 245 { 246 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 247 248 return tx_sc->send_sci || 249 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb); 250 } 251 252 static sci_t make_sci(u8 *addr, __be16 port) 253 { 254 sci_t sci; 255 256 memcpy(&sci, addr, ETH_ALEN); 257 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); 258 259 return sci; 260 } 261 262 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present) 263 { 264 sci_t sci; 265 266 if (sci_present) 267 memcpy(&sci, hdr->secure_channel_id, 268 sizeof(hdr->secure_channel_id)); 269 else 270 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); 271 272 return sci; 273 } 274 275 static unsigned int macsec_sectag_len(bool sci_present) 276 { 277 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); 278 } 279 280 static unsigned int macsec_hdr_len(bool sci_present) 281 { 282 return macsec_sectag_len(sci_present) + ETH_HLEN; 283 } 284 285 static unsigned int macsec_extra_len(bool sci_present) 286 { 287 return macsec_sectag_len(sci_present) + sizeof(__be16); 288 } 289 290 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ 291 static void macsec_fill_sectag(struct macsec_eth_header *h, 292 const struct macsec_secy *secy, u32 pn, 293 bool sci_present) 294 { 295 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 296 297 memset(&h->tci_an, 0, macsec_sectag_len(sci_present)); 298 h->eth.h_proto = htons(ETH_P_MACSEC); 299 300 if (sci_present) { 301 h->tci_an |= MACSEC_TCI_SC; 302 memcpy(&h->secure_channel_id, &secy->sci, 303 sizeof(h->secure_channel_id)); 304 } else { 305 if (tx_sc->end_station) 306 h->tci_an |= MACSEC_TCI_ES; 307 if (tx_sc->scb) 308 h->tci_an |= MACSEC_TCI_SCB; 309 } 310 311 h->packet_number = htonl(pn); 312 313 /* with GCM, C/E clear for !encrypt, both set for encrypt */ 314 if (tx_sc->encrypt) 315 h->tci_an |= MACSEC_TCI_CONFID; 316 else if (secy->icv_len != DEFAULT_ICV_LEN) 317 h->tci_an |= MACSEC_TCI_C; 318 319 h->tci_an |= tx_sc->encoding_sa; 320 } 321 322 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) 323 { 324 if (data_len < MIN_NON_SHORT_LEN) 325 h->short_length = data_len; 326 } 327 328 /* Checks if a MACsec interface is being offloaded to an hardware engine */ 329 static bool macsec_is_offloaded(struct macsec_dev *macsec) 330 { 331 if (macsec->offload == MACSEC_OFFLOAD_MAC || 332 macsec->offload == MACSEC_OFFLOAD_PHY) 333 return true; 334 335 return false; 336 } 337 338 /* Checks if underlying layers implement MACsec offloading functions. */ 339 static bool macsec_check_offload(enum macsec_offload offload, 340 struct macsec_dev *macsec) 341 { 342 if (!macsec || !macsec->real_dev) 343 return false; 344 345 if (offload == MACSEC_OFFLOAD_PHY) 346 return macsec->real_dev->phydev && 347 macsec->real_dev->phydev->macsec_ops; 348 else if (offload == MACSEC_OFFLOAD_MAC) 349 return macsec->real_dev->features & NETIF_F_HW_MACSEC && 350 macsec->real_dev->macsec_ops; 351 352 return false; 353 } 354 355 static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload, 356 struct macsec_dev *macsec, 357 struct macsec_context *ctx) 358 { 359 if (ctx) { 360 memset(ctx, 0, sizeof(*ctx)); 361 ctx->offload = offload; 362 363 if (offload == MACSEC_OFFLOAD_PHY) 364 ctx->phydev = macsec->real_dev->phydev; 365 else if (offload == MACSEC_OFFLOAD_MAC) 366 ctx->netdev = macsec->real_dev; 367 } 368 369 if (offload == MACSEC_OFFLOAD_PHY) 370 return macsec->real_dev->phydev->macsec_ops; 371 else 372 return macsec->real_dev->macsec_ops; 373 } 374 375 /* Returns a pointer to the MACsec ops struct if any and updates the MACsec 376 * context device reference if provided. 377 */ 378 static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec, 379 struct macsec_context *ctx) 380 { 381 if (!macsec_check_offload(macsec->offload, macsec)) 382 return NULL; 383 384 return __macsec_get_ops(macsec->offload, macsec, ctx); 385 } 386 387 /* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */ 388 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn) 389 { 390 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; 391 int len = skb->len - 2 * ETH_ALEN; 392 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; 393 394 /* a) It comprises at least 17 octets */ 395 if (skb->len <= 16) 396 return false; 397 398 /* b) MACsec EtherType: already checked */ 399 400 /* c) V bit is clear */ 401 if (h->tci_an & MACSEC_TCI_VERSION) 402 return false; 403 404 /* d) ES or SCB => !SC */ 405 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && 406 (h->tci_an & MACSEC_TCI_SC)) 407 return false; 408 409 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ 410 if (h->unused) 411 return false; 412 413 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */ 414 if (!h->packet_number && !xpn) 415 return false; 416 417 /* length check, f) g) h) i) */ 418 if (h->short_length) 419 return len == extra_len + h->short_length; 420 return len >= extra_len + MIN_NON_SHORT_LEN; 421 } 422 423 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) 424 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN 425 426 static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn, 427 salt_t salt) 428 { 429 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv; 430 431 gcm_iv->ssci = ssci ^ salt.ssci; 432 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn; 433 } 434 435 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) 436 { 437 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; 438 439 gcm_iv->sci = sci; 440 gcm_iv->pn = htonl(pn); 441 } 442 443 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) 444 { 445 return (struct macsec_eth_header *)skb_mac_header(skb); 446 } 447 448 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 449 { 450 return make_sci(dev->dev_addr, port); 451 } 452 453 static void __macsec_pn_wrapped(struct macsec_secy *secy, 454 struct macsec_tx_sa *tx_sa) 455 { 456 pr_debug("PN wrapped, transitioning to !oper\n"); 457 tx_sa->active = false; 458 if (secy->protect_frames) 459 secy->operational = false; 460 } 461 462 void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa) 463 { 464 spin_lock_bh(&tx_sa->lock); 465 __macsec_pn_wrapped(secy, tx_sa); 466 spin_unlock_bh(&tx_sa->lock); 467 } 468 EXPORT_SYMBOL_GPL(macsec_pn_wrapped); 469 470 static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa, 471 struct macsec_secy *secy) 472 { 473 pn_t pn; 474 475 spin_lock_bh(&tx_sa->lock); 476 477 pn = tx_sa->next_pn_halves; 478 if (secy->xpn) 479 tx_sa->next_pn++; 480 else 481 tx_sa->next_pn_halves.lower++; 482 483 if (tx_sa->next_pn == 0) 484 __macsec_pn_wrapped(secy, tx_sa); 485 spin_unlock_bh(&tx_sa->lock); 486 487 return pn; 488 } 489 490 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) 491 { 492 struct macsec_dev *macsec = netdev_priv(dev); 493 494 skb->dev = macsec->real_dev; 495 skb_reset_mac_header(skb); 496 skb->protocol = eth_hdr(skb)->h_proto; 497 } 498 499 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, 500 struct macsec_tx_sa *tx_sa) 501 { 502 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); 503 504 u64_stats_update_begin(&txsc_stats->syncp); 505 if (tx_sc->encrypt) { 506 txsc_stats->stats.OutOctetsEncrypted += skb->len; 507 txsc_stats->stats.OutPktsEncrypted++; 508 this_cpu_inc(tx_sa->stats->OutPktsEncrypted); 509 } else { 510 txsc_stats->stats.OutOctetsProtected += skb->len; 511 txsc_stats->stats.OutPktsProtected++; 512 this_cpu_inc(tx_sa->stats->OutPktsProtected); 513 } 514 u64_stats_update_end(&txsc_stats->syncp); 515 } 516 517 static void count_tx(struct net_device *dev, int ret, int len) 518 { 519 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 520 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 521 522 u64_stats_update_begin(&stats->syncp); 523 stats->tx_packets++; 524 stats->tx_bytes += len; 525 u64_stats_update_end(&stats->syncp); 526 } 527 } 528 529 static void macsec_encrypt_done(struct crypto_async_request *base, int err) 530 { 531 struct sk_buff *skb = base->data; 532 struct net_device *dev = skb->dev; 533 struct macsec_dev *macsec = macsec_priv(dev); 534 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 535 int len, ret; 536 537 aead_request_free(macsec_skb_cb(skb)->req); 538 539 rcu_read_lock_bh(); 540 macsec_encrypt_finish(skb, dev); 541 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 542 len = skb->len; 543 ret = dev_queue_xmit(skb); 544 count_tx(dev, ret, len); 545 rcu_read_unlock_bh(); 546 547 macsec_txsa_put(sa); 548 dev_put(dev); 549 } 550 551 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, 552 unsigned char **iv, 553 struct scatterlist **sg, 554 int num_frags) 555 { 556 size_t size, iv_offset, sg_offset; 557 struct aead_request *req; 558 void *tmp; 559 560 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); 561 iv_offset = size; 562 size += GCM_AES_IV_LEN; 563 564 size = ALIGN(size, __alignof__(struct scatterlist)); 565 sg_offset = size; 566 size += sizeof(struct scatterlist) * num_frags; 567 568 tmp = kmalloc(size, GFP_ATOMIC); 569 if (!tmp) 570 return NULL; 571 572 *iv = (unsigned char *)(tmp + iv_offset); 573 *sg = (struct scatterlist *)(tmp + sg_offset); 574 req = tmp; 575 576 aead_request_set_tfm(req, tfm); 577 578 return req; 579 } 580 581 static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 582 struct net_device *dev) 583 { 584 int ret; 585 struct scatterlist *sg; 586 struct sk_buff *trailer; 587 unsigned char *iv; 588 struct ethhdr *eth; 589 struct macsec_eth_header *hh; 590 size_t unprotected_len; 591 struct aead_request *req; 592 struct macsec_secy *secy; 593 struct macsec_tx_sc *tx_sc; 594 struct macsec_tx_sa *tx_sa; 595 struct macsec_dev *macsec = macsec_priv(dev); 596 bool sci_present; 597 pn_t pn; 598 599 secy = &macsec->secy; 600 tx_sc = &secy->tx_sc; 601 602 /* 10.5.1 TX SA assignment */ 603 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); 604 if (!tx_sa) { 605 secy->operational = false; 606 kfree_skb(skb); 607 return ERR_PTR(-EINVAL); 608 } 609 610 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || 611 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { 612 struct sk_buff *nskb = skb_copy_expand(skb, 613 MACSEC_NEEDED_HEADROOM, 614 MACSEC_NEEDED_TAILROOM, 615 GFP_ATOMIC); 616 if (likely(nskb)) { 617 consume_skb(skb); 618 skb = nskb; 619 } else { 620 macsec_txsa_put(tx_sa); 621 kfree_skb(skb); 622 return ERR_PTR(-ENOMEM); 623 } 624 } else { 625 skb = skb_unshare(skb, GFP_ATOMIC); 626 if (!skb) { 627 macsec_txsa_put(tx_sa); 628 return ERR_PTR(-ENOMEM); 629 } 630 } 631 632 unprotected_len = skb->len; 633 eth = eth_hdr(skb); 634 sci_present = send_sci(secy); 635 hh = skb_push(skb, macsec_extra_len(sci_present)); 636 memmove(hh, eth, 2 * ETH_ALEN); 637 638 pn = tx_sa_update_pn(tx_sa, secy); 639 if (pn.full64 == 0) { 640 macsec_txsa_put(tx_sa); 641 kfree_skb(skb); 642 return ERR_PTR(-ENOLINK); 643 } 644 macsec_fill_sectag(hh, secy, pn.lower, sci_present); 645 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); 646 647 skb_put(skb, secy->icv_len); 648 649 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { 650 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 651 652 u64_stats_update_begin(&secy_stats->syncp); 653 secy_stats->stats.OutPktsTooLong++; 654 u64_stats_update_end(&secy_stats->syncp); 655 656 macsec_txsa_put(tx_sa); 657 kfree_skb(skb); 658 return ERR_PTR(-EINVAL); 659 } 660 661 ret = skb_cow_data(skb, 0, &trailer); 662 if (unlikely(ret < 0)) { 663 macsec_txsa_put(tx_sa); 664 kfree_skb(skb); 665 return ERR_PTR(ret); 666 } 667 668 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret); 669 if (!req) { 670 macsec_txsa_put(tx_sa); 671 kfree_skb(skb); 672 return ERR_PTR(-ENOMEM); 673 } 674 675 if (secy->xpn) 676 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt); 677 else 678 macsec_fill_iv(iv, secy->sci, pn.lower); 679 680 sg_init_table(sg, ret); 681 ret = skb_to_sgvec(skb, sg, 0, skb->len); 682 if (unlikely(ret < 0)) { 683 aead_request_free(req); 684 macsec_txsa_put(tx_sa); 685 kfree_skb(skb); 686 return ERR_PTR(ret); 687 } 688 689 if (tx_sc->encrypt) { 690 int len = skb->len - macsec_hdr_len(sci_present) - 691 secy->icv_len; 692 aead_request_set_crypt(req, sg, sg, len, iv); 693 aead_request_set_ad(req, macsec_hdr_len(sci_present)); 694 } else { 695 aead_request_set_crypt(req, sg, sg, 0, iv); 696 aead_request_set_ad(req, skb->len - secy->icv_len); 697 } 698 699 macsec_skb_cb(skb)->req = req; 700 macsec_skb_cb(skb)->tx_sa = tx_sa; 701 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 702 703 dev_hold(skb->dev); 704 ret = crypto_aead_encrypt(req); 705 if (ret == -EINPROGRESS) { 706 return ERR_PTR(ret); 707 } else if (ret != 0) { 708 dev_put(skb->dev); 709 kfree_skb(skb); 710 aead_request_free(req); 711 macsec_txsa_put(tx_sa); 712 return ERR_PTR(-EINVAL); 713 } 714 715 dev_put(skb->dev); 716 aead_request_free(req); 717 macsec_txsa_put(tx_sa); 718 719 return skb; 720 } 721 722 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 723 { 724 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 725 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 726 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 727 u32 lowest_pn = 0; 728 729 spin_lock(&rx_sa->lock); 730 if (rx_sa->next_pn_halves.lower >= secy->replay_window) 731 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window; 732 733 /* Now perform replay protection check again 734 * (see IEEE 802.1AE-2006 figure 10-5) 735 */ 736 if (secy->replay_protect && pn < lowest_pn && 737 (!secy->xpn || pn_same_half(pn, lowest_pn))) { 738 spin_unlock(&rx_sa->lock); 739 u64_stats_update_begin(&rxsc_stats->syncp); 740 rxsc_stats->stats.InPktsLate++; 741 u64_stats_update_end(&rxsc_stats->syncp); 742 return false; 743 } 744 745 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 746 u64_stats_update_begin(&rxsc_stats->syncp); 747 if (hdr->tci_an & MACSEC_TCI_E) 748 rxsc_stats->stats.InOctetsDecrypted += skb->len; 749 else 750 rxsc_stats->stats.InOctetsValidated += skb->len; 751 u64_stats_update_end(&rxsc_stats->syncp); 752 } 753 754 if (!macsec_skb_cb(skb)->valid) { 755 spin_unlock(&rx_sa->lock); 756 757 /* 10.6.5 */ 758 if (hdr->tci_an & MACSEC_TCI_C || 759 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 760 u64_stats_update_begin(&rxsc_stats->syncp); 761 rxsc_stats->stats.InPktsNotValid++; 762 u64_stats_update_end(&rxsc_stats->syncp); 763 return false; 764 } 765 766 u64_stats_update_begin(&rxsc_stats->syncp); 767 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 768 rxsc_stats->stats.InPktsInvalid++; 769 this_cpu_inc(rx_sa->stats->InPktsInvalid); 770 } else if (pn < lowest_pn) { 771 rxsc_stats->stats.InPktsDelayed++; 772 } else { 773 rxsc_stats->stats.InPktsUnchecked++; 774 } 775 u64_stats_update_end(&rxsc_stats->syncp); 776 } else { 777 u64_stats_update_begin(&rxsc_stats->syncp); 778 if (pn < lowest_pn) { 779 rxsc_stats->stats.InPktsDelayed++; 780 } else { 781 rxsc_stats->stats.InPktsOK++; 782 this_cpu_inc(rx_sa->stats->InPktsOK); 783 } 784 u64_stats_update_end(&rxsc_stats->syncp); 785 786 // Instead of "pn >=" - to support pn overflow in xpn 787 if (pn + 1 > rx_sa->next_pn_halves.lower) { 788 rx_sa->next_pn_halves.lower = pn + 1; 789 } else if (secy->xpn && 790 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) { 791 rx_sa->next_pn_halves.upper++; 792 rx_sa->next_pn_halves.lower = pn + 1; 793 } 794 795 spin_unlock(&rx_sa->lock); 796 } 797 798 return true; 799 } 800 801 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 802 { 803 skb->pkt_type = PACKET_HOST; 804 skb->protocol = eth_type_trans(skb, dev); 805 806 skb_reset_network_header(skb); 807 if (!skb_transport_header_was_set(skb)) 808 skb_reset_transport_header(skb); 809 skb_reset_mac_len(skb); 810 } 811 812 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 813 { 814 skb->ip_summed = CHECKSUM_NONE; 815 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 816 skb_pull(skb, hdr_len); 817 pskb_trim_unique(skb, skb->len - icv_len); 818 } 819 820 static void count_rx(struct net_device *dev, int len) 821 { 822 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 823 824 u64_stats_update_begin(&stats->syncp); 825 stats->rx_packets++; 826 stats->rx_bytes += len; 827 u64_stats_update_end(&stats->syncp); 828 } 829 830 static void macsec_decrypt_done(struct crypto_async_request *base, int err) 831 { 832 struct sk_buff *skb = base->data; 833 struct net_device *dev = skb->dev; 834 struct macsec_dev *macsec = macsec_priv(dev); 835 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 836 struct macsec_rx_sc *rx_sc = rx_sa->sc; 837 int len; 838 u32 pn; 839 840 aead_request_free(macsec_skb_cb(skb)->req); 841 842 if (!err) 843 macsec_skb_cb(skb)->valid = true; 844 845 rcu_read_lock_bh(); 846 pn = ntohl(macsec_ethhdr(skb)->packet_number); 847 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 848 rcu_read_unlock_bh(); 849 kfree_skb(skb); 850 goto out; 851 } 852 853 macsec_finalize_skb(skb, macsec->secy.icv_len, 854 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 855 macsec_reset_skb(skb, macsec->secy.netdev); 856 857 len = skb->len; 858 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS) 859 count_rx(dev, len); 860 861 rcu_read_unlock_bh(); 862 863 out: 864 macsec_rxsa_put(rx_sa); 865 macsec_rxsc_put(rx_sc); 866 dev_put(dev); 867 } 868 869 static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 870 struct net_device *dev, 871 struct macsec_rx_sa *rx_sa, 872 sci_t sci, 873 struct macsec_secy *secy) 874 { 875 int ret; 876 struct scatterlist *sg; 877 struct sk_buff *trailer; 878 unsigned char *iv; 879 struct aead_request *req; 880 struct macsec_eth_header *hdr; 881 u32 hdr_pn; 882 u16 icv_len = secy->icv_len; 883 884 macsec_skb_cb(skb)->valid = false; 885 skb = skb_share_check(skb, GFP_ATOMIC); 886 if (!skb) 887 return ERR_PTR(-ENOMEM); 888 889 ret = skb_cow_data(skb, 0, &trailer); 890 if (unlikely(ret < 0)) { 891 kfree_skb(skb); 892 return ERR_PTR(ret); 893 } 894 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret); 895 if (!req) { 896 kfree_skb(skb); 897 return ERR_PTR(-ENOMEM); 898 } 899 900 hdr = (struct macsec_eth_header *)skb->data; 901 hdr_pn = ntohl(hdr->packet_number); 902 903 if (secy->xpn) { 904 pn_t recovered_pn = rx_sa->next_pn_halves; 905 906 recovered_pn.lower = hdr_pn; 907 if (hdr_pn < rx_sa->next_pn_halves.lower && 908 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower)) 909 recovered_pn.upper++; 910 911 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64, 912 rx_sa->key.salt); 913 } else { 914 macsec_fill_iv(iv, sci, hdr_pn); 915 } 916 917 sg_init_table(sg, ret); 918 ret = skb_to_sgvec(skb, sg, 0, skb->len); 919 if (unlikely(ret < 0)) { 920 aead_request_free(req); 921 kfree_skb(skb); 922 return ERR_PTR(ret); 923 } 924 925 if (hdr->tci_an & MACSEC_TCI_E) { 926 /* confidentiality: ethernet + macsec header 927 * authenticated, encrypted payload 928 */ 929 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 930 931 aead_request_set_crypt(req, sg, sg, len, iv); 932 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 933 skb = skb_unshare(skb, GFP_ATOMIC); 934 if (!skb) { 935 aead_request_free(req); 936 return ERR_PTR(-ENOMEM); 937 } 938 } else { 939 /* integrity only: all headers + data authenticated */ 940 aead_request_set_crypt(req, sg, sg, icv_len, iv); 941 aead_request_set_ad(req, skb->len - icv_len); 942 } 943 944 macsec_skb_cb(skb)->req = req; 945 skb->dev = dev; 946 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 947 948 dev_hold(dev); 949 ret = crypto_aead_decrypt(req); 950 if (ret == -EINPROGRESS) { 951 return ERR_PTR(ret); 952 } else if (ret != 0) { 953 /* decryption/authentication failed 954 * 10.6 if validateFrames is disabled, deliver anyway 955 */ 956 if (ret != -EBADMSG) { 957 kfree_skb(skb); 958 skb = ERR_PTR(ret); 959 } 960 } else { 961 macsec_skb_cb(skb)->valid = true; 962 } 963 dev_put(dev); 964 965 aead_request_free(req); 966 967 return skb; 968 } 969 970 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 971 { 972 struct macsec_rx_sc *rx_sc; 973 974 for_each_rxsc(secy, rx_sc) { 975 if (rx_sc->sci == sci) 976 return rx_sc; 977 } 978 979 return NULL; 980 } 981 982 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 983 { 984 struct macsec_rx_sc *rx_sc; 985 986 for_each_rxsc_rtnl(secy, rx_sc) { 987 if (rx_sc->sci == sci) 988 return rx_sc; 989 } 990 991 return NULL; 992 } 993 994 static enum rx_handler_result handle_not_macsec(struct sk_buff *skb) 995 { 996 /* Deliver to the uncontrolled port by default */ 997 enum rx_handler_result ret = RX_HANDLER_PASS; 998 struct ethhdr *hdr = eth_hdr(skb); 999 struct macsec_rxh_data *rxd; 1000 struct macsec_dev *macsec; 1001 1002 rcu_read_lock(); 1003 rxd = macsec_data_rcu(skb->dev); 1004 1005 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1006 struct sk_buff *nskb; 1007 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 1008 struct net_device *ndev = macsec->secy.netdev; 1009 1010 /* If h/w offloading is enabled, HW decodes frames and strips 1011 * the SecTAG, so we have to deduce which port to deliver to. 1012 */ 1013 if (macsec_is_offloaded(macsec) && netif_running(ndev)) { 1014 if (ether_addr_equal_64bits(hdr->h_dest, 1015 ndev->dev_addr)) { 1016 /* exact match, divert skb to this port */ 1017 skb->dev = ndev; 1018 skb->pkt_type = PACKET_HOST; 1019 ret = RX_HANDLER_ANOTHER; 1020 goto out; 1021 } else if (is_multicast_ether_addr_64bits( 1022 hdr->h_dest)) { 1023 /* multicast frame, deliver on this port too */ 1024 nskb = skb_clone(skb, GFP_ATOMIC); 1025 if (!nskb) 1026 break; 1027 1028 nskb->dev = ndev; 1029 if (ether_addr_equal_64bits(hdr->h_dest, 1030 ndev->broadcast)) 1031 nskb->pkt_type = PACKET_BROADCAST; 1032 else 1033 nskb->pkt_type = PACKET_MULTICAST; 1034 1035 netif_rx(nskb); 1036 } 1037 continue; 1038 } 1039 1040 /* 10.6 If the management control validateFrames is not 1041 * Strict, frames without a SecTAG are received, counted, and 1042 * delivered to the Controlled Port 1043 */ 1044 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1045 u64_stats_update_begin(&secy_stats->syncp); 1046 secy_stats->stats.InPktsNoTag++; 1047 u64_stats_update_end(&secy_stats->syncp); 1048 continue; 1049 } 1050 1051 /* deliver on this port */ 1052 nskb = skb_clone(skb, GFP_ATOMIC); 1053 if (!nskb) 1054 break; 1055 1056 nskb->dev = ndev; 1057 1058 if (netif_rx(nskb) == NET_RX_SUCCESS) { 1059 u64_stats_update_begin(&secy_stats->syncp); 1060 secy_stats->stats.InPktsUntagged++; 1061 u64_stats_update_end(&secy_stats->syncp); 1062 } 1063 } 1064 1065 out: 1066 rcu_read_unlock(); 1067 return ret; 1068 } 1069 1070 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 1071 { 1072 struct sk_buff *skb = *pskb; 1073 struct net_device *dev = skb->dev; 1074 struct macsec_eth_header *hdr; 1075 struct macsec_secy *secy = NULL; 1076 struct macsec_rx_sc *rx_sc; 1077 struct macsec_rx_sa *rx_sa; 1078 struct macsec_rxh_data *rxd; 1079 struct macsec_dev *macsec; 1080 unsigned int len; 1081 sci_t sci; 1082 u32 hdr_pn; 1083 bool cbit; 1084 struct pcpu_rx_sc_stats *rxsc_stats; 1085 struct pcpu_secy_stats *secy_stats; 1086 bool pulled_sci; 1087 int ret; 1088 1089 if (skb_headroom(skb) < ETH_HLEN) 1090 goto drop_direct; 1091 1092 hdr = macsec_ethhdr(skb); 1093 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) 1094 return handle_not_macsec(skb); 1095 1096 skb = skb_unshare(skb, GFP_ATOMIC); 1097 *pskb = skb; 1098 if (!skb) 1099 return RX_HANDLER_CONSUMED; 1100 1101 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1102 if (!pulled_sci) { 1103 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1104 goto drop_direct; 1105 } 1106 1107 hdr = macsec_ethhdr(skb); 1108 1109 /* Frames with a SecTAG that has the TCI E bit set but the C 1110 * bit clear are discarded, as this reserved encoding is used 1111 * to identify frames with a SecTAG that are not to be 1112 * delivered to the Controlled Port. 1113 */ 1114 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1115 return RX_HANDLER_PASS; 1116 1117 /* now, pull the extra length */ 1118 if (hdr->tci_an & MACSEC_TCI_SC) { 1119 if (!pulled_sci) 1120 goto drop_direct; 1121 } 1122 1123 /* ethernet header is part of crypto processing */ 1124 skb_push(skb, ETH_HLEN); 1125 1126 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1127 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1128 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci); 1129 1130 rcu_read_lock(); 1131 rxd = macsec_data_rcu(skb->dev); 1132 1133 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1134 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1135 1136 sc = sc ? macsec_rxsc_get(sc) : NULL; 1137 1138 if (sc) { 1139 secy = &macsec->secy; 1140 rx_sc = sc; 1141 break; 1142 } 1143 } 1144 1145 if (!secy) 1146 goto nosci; 1147 1148 dev = secy->netdev; 1149 macsec = macsec_priv(dev); 1150 secy_stats = this_cpu_ptr(macsec->stats); 1151 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1152 1153 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) { 1154 u64_stats_update_begin(&secy_stats->syncp); 1155 secy_stats->stats.InPktsBadTag++; 1156 u64_stats_update_end(&secy_stats->syncp); 1157 goto drop_nosa; 1158 } 1159 1160 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1161 if (!rx_sa) { 1162 /* 10.6.1 if the SA is not in use */ 1163 1164 /* If validateFrames is Strict or the C bit in the 1165 * SecTAG is set, discard 1166 */ 1167 if (hdr->tci_an & MACSEC_TCI_C || 1168 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1169 u64_stats_update_begin(&rxsc_stats->syncp); 1170 rxsc_stats->stats.InPktsNotUsingSA++; 1171 u64_stats_update_end(&rxsc_stats->syncp); 1172 goto drop_nosa; 1173 } 1174 1175 /* not Strict, the frame (with the SecTAG and ICV 1176 * removed) is delivered to the Controlled Port. 1177 */ 1178 u64_stats_update_begin(&rxsc_stats->syncp); 1179 rxsc_stats->stats.InPktsUnusedSA++; 1180 u64_stats_update_end(&rxsc_stats->syncp); 1181 goto deliver; 1182 } 1183 1184 /* First, PN check to avoid decrypting obviously wrong packets */ 1185 hdr_pn = ntohl(hdr->packet_number); 1186 if (secy->replay_protect) { 1187 bool late; 1188 1189 spin_lock(&rx_sa->lock); 1190 late = rx_sa->next_pn_halves.lower >= secy->replay_window && 1191 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window); 1192 1193 if (secy->xpn) 1194 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn); 1195 spin_unlock(&rx_sa->lock); 1196 1197 if (late) { 1198 u64_stats_update_begin(&rxsc_stats->syncp); 1199 rxsc_stats->stats.InPktsLate++; 1200 u64_stats_update_end(&rxsc_stats->syncp); 1201 goto drop; 1202 } 1203 } 1204 1205 macsec_skb_cb(skb)->rx_sa = rx_sa; 1206 1207 /* Disabled && !changed text => skip validation */ 1208 if (hdr->tci_an & MACSEC_TCI_C || 1209 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1210 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1211 1212 if (IS_ERR(skb)) { 1213 /* the decrypt callback needs the reference */ 1214 if (PTR_ERR(skb) != -EINPROGRESS) { 1215 macsec_rxsa_put(rx_sa); 1216 macsec_rxsc_put(rx_sc); 1217 } 1218 rcu_read_unlock(); 1219 *pskb = NULL; 1220 return RX_HANDLER_CONSUMED; 1221 } 1222 1223 if (!macsec_post_decrypt(skb, secy, hdr_pn)) 1224 goto drop; 1225 1226 deliver: 1227 macsec_finalize_skb(skb, secy->icv_len, 1228 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1229 macsec_reset_skb(skb, secy->netdev); 1230 1231 if (rx_sa) 1232 macsec_rxsa_put(rx_sa); 1233 macsec_rxsc_put(rx_sc); 1234 1235 skb_orphan(skb); 1236 len = skb->len; 1237 ret = gro_cells_receive(&macsec->gro_cells, skb); 1238 if (ret == NET_RX_SUCCESS) 1239 count_rx(dev, len); 1240 else 1241 macsec->secy.netdev->stats.rx_dropped++; 1242 1243 rcu_read_unlock(); 1244 1245 *pskb = NULL; 1246 return RX_HANDLER_CONSUMED; 1247 1248 drop: 1249 macsec_rxsa_put(rx_sa); 1250 drop_nosa: 1251 macsec_rxsc_put(rx_sc); 1252 rcu_read_unlock(); 1253 drop_direct: 1254 kfree_skb(skb); 1255 *pskb = NULL; 1256 return RX_HANDLER_CONSUMED; 1257 1258 nosci: 1259 /* 10.6.1 if the SC is not found */ 1260 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1261 if (!cbit) 1262 macsec_finalize_skb(skb, DEFAULT_ICV_LEN, 1263 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1264 1265 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1266 struct sk_buff *nskb; 1267 1268 secy_stats = this_cpu_ptr(macsec->stats); 1269 1270 /* If validateFrames is Strict or the C bit in the 1271 * SecTAG is set, discard 1272 */ 1273 if (cbit || 1274 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1275 u64_stats_update_begin(&secy_stats->syncp); 1276 secy_stats->stats.InPktsNoSCI++; 1277 u64_stats_update_end(&secy_stats->syncp); 1278 continue; 1279 } 1280 1281 /* not strict, the frame (with the SecTAG and ICV 1282 * removed) is delivered to the Controlled Port. 1283 */ 1284 nskb = skb_clone(skb, GFP_ATOMIC); 1285 if (!nskb) 1286 break; 1287 1288 macsec_reset_skb(nskb, macsec->secy.netdev); 1289 1290 ret = netif_rx(nskb); 1291 if (ret == NET_RX_SUCCESS) { 1292 u64_stats_update_begin(&secy_stats->syncp); 1293 secy_stats->stats.InPktsUnknownSCI++; 1294 u64_stats_update_end(&secy_stats->syncp); 1295 } else { 1296 macsec->secy.netdev->stats.rx_dropped++; 1297 } 1298 } 1299 1300 rcu_read_unlock(); 1301 *pskb = skb; 1302 return RX_HANDLER_PASS; 1303 } 1304 1305 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1306 { 1307 struct crypto_aead *tfm; 1308 int ret; 1309 1310 /* Pick a sync gcm(aes) cipher to ensure order is preserved. */ 1311 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC); 1312 1313 if (IS_ERR(tfm)) 1314 return tfm; 1315 1316 ret = crypto_aead_setkey(tfm, key, key_len); 1317 if (ret < 0) 1318 goto fail; 1319 1320 ret = crypto_aead_setauthsize(tfm, icv_len); 1321 if (ret < 0) 1322 goto fail; 1323 1324 return tfm; 1325 fail: 1326 crypto_free_aead(tfm); 1327 return ERR_PTR(ret); 1328 } 1329 1330 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1331 int icv_len) 1332 { 1333 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1334 if (!rx_sa->stats) 1335 return -ENOMEM; 1336 1337 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1338 if (IS_ERR(rx_sa->key.tfm)) { 1339 free_percpu(rx_sa->stats); 1340 return PTR_ERR(rx_sa->key.tfm); 1341 } 1342 1343 rx_sa->ssci = MACSEC_UNDEF_SSCI; 1344 rx_sa->active = false; 1345 rx_sa->next_pn = 1; 1346 refcount_set(&rx_sa->refcnt, 1); 1347 spin_lock_init(&rx_sa->lock); 1348 1349 return 0; 1350 } 1351 1352 static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1353 { 1354 rx_sa->active = false; 1355 1356 macsec_rxsa_put(rx_sa); 1357 } 1358 1359 static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1360 { 1361 int i; 1362 1363 for (i = 0; i < MACSEC_NUM_AN; i++) { 1364 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1365 1366 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1367 if (sa) 1368 clear_rx_sa(sa); 1369 } 1370 1371 macsec_rxsc_put(rx_sc); 1372 } 1373 1374 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1375 { 1376 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1377 1378 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1379 rx_sc; 1380 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1381 if (rx_sc->sci == sci) { 1382 if (rx_sc->active) 1383 secy->n_rx_sc--; 1384 rcu_assign_pointer(*rx_scp, rx_sc->next); 1385 return rx_sc; 1386 } 1387 } 1388 1389 return NULL; 1390 } 1391 1392 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci) 1393 { 1394 struct macsec_rx_sc *rx_sc; 1395 struct macsec_dev *macsec; 1396 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1397 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1398 struct macsec_secy *secy; 1399 1400 list_for_each_entry(macsec, &rxd->secys, secys) { 1401 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1402 return ERR_PTR(-EEXIST); 1403 } 1404 1405 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL); 1406 if (!rx_sc) 1407 return ERR_PTR(-ENOMEM); 1408 1409 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1410 if (!rx_sc->stats) { 1411 kfree(rx_sc); 1412 return ERR_PTR(-ENOMEM); 1413 } 1414 1415 rx_sc->sci = sci; 1416 rx_sc->active = true; 1417 refcount_set(&rx_sc->refcnt, 1); 1418 1419 secy = &macsec_priv(dev)->secy; 1420 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1421 rcu_assign_pointer(secy->rx_sc, rx_sc); 1422 1423 if (rx_sc->active) 1424 secy->n_rx_sc++; 1425 1426 return rx_sc; 1427 } 1428 1429 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1430 int icv_len) 1431 { 1432 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1433 if (!tx_sa->stats) 1434 return -ENOMEM; 1435 1436 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1437 if (IS_ERR(tx_sa->key.tfm)) { 1438 free_percpu(tx_sa->stats); 1439 return PTR_ERR(tx_sa->key.tfm); 1440 } 1441 1442 tx_sa->ssci = MACSEC_UNDEF_SSCI; 1443 tx_sa->active = false; 1444 refcount_set(&tx_sa->refcnt, 1); 1445 spin_lock_init(&tx_sa->lock); 1446 1447 return 0; 1448 } 1449 1450 static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1451 { 1452 tx_sa->active = false; 1453 1454 macsec_txsa_put(tx_sa); 1455 } 1456 1457 static struct genl_family macsec_fam; 1458 1459 static struct net_device *get_dev_from_nl(struct net *net, 1460 struct nlattr **attrs) 1461 { 1462 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1463 struct net_device *dev; 1464 1465 dev = __dev_get_by_index(net, ifindex); 1466 if (!dev) 1467 return ERR_PTR(-ENODEV); 1468 1469 if (!netif_is_macsec(dev)) 1470 return ERR_PTR(-ENODEV); 1471 1472 return dev; 1473 } 1474 1475 static enum macsec_offload nla_get_offload(const struct nlattr *nla) 1476 { 1477 return (__force enum macsec_offload)nla_get_u8(nla); 1478 } 1479 1480 static sci_t nla_get_sci(const struct nlattr *nla) 1481 { 1482 return (__force sci_t)nla_get_u64(nla); 1483 } 1484 1485 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, 1486 int padattr) 1487 { 1488 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); 1489 } 1490 1491 static ssci_t nla_get_ssci(const struct nlattr *nla) 1492 { 1493 return (__force ssci_t)nla_get_u32(nla); 1494 } 1495 1496 static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value) 1497 { 1498 return nla_put_u32(skb, attrtype, (__force u64)value); 1499 } 1500 1501 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1502 struct nlattr **attrs, 1503 struct nlattr **tb_sa, 1504 struct net_device **devp, 1505 struct macsec_secy **secyp, 1506 struct macsec_tx_sc **scp, 1507 u8 *assoc_num) 1508 { 1509 struct net_device *dev; 1510 struct macsec_secy *secy; 1511 struct macsec_tx_sc *tx_sc; 1512 struct macsec_tx_sa *tx_sa; 1513 1514 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1515 return ERR_PTR(-EINVAL); 1516 1517 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1518 1519 dev = get_dev_from_nl(net, attrs); 1520 if (IS_ERR(dev)) 1521 return ERR_CAST(dev); 1522 1523 if (*assoc_num >= MACSEC_NUM_AN) 1524 return ERR_PTR(-EINVAL); 1525 1526 secy = &macsec_priv(dev)->secy; 1527 tx_sc = &secy->tx_sc; 1528 1529 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1530 if (!tx_sa) 1531 return ERR_PTR(-ENODEV); 1532 1533 *devp = dev; 1534 *scp = tx_sc; 1535 *secyp = secy; 1536 return tx_sa; 1537 } 1538 1539 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1540 struct nlattr **attrs, 1541 struct nlattr **tb_rxsc, 1542 struct net_device **devp, 1543 struct macsec_secy **secyp) 1544 { 1545 struct net_device *dev; 1546 struct macsec_secy *secy; 1547 struct macsec_rx_sc *rx_sc; 1548 sci_t sci; 1549 1550 dev = get_dev_from_nl(net, attrs); 1551 if (IS_ERR(dev)) 1552 return ERR_CAST(dev); 1553 1554 secy = &macsec_priv(dev)->secy; 1555 1556 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1557 return ERR_PTR(-EINVAL); 1558 1559 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1560 rx_sc = find_rx_sc_rtnl(secy, sci); 1561 if (!rx_sc) 1562 return ERR_PTR(-ENODEV); 1563 1564 *secyp = secy; 1565 *devp = dev; 1566 1567 return rx_sc; 1568 } 1569 1570 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1571 struct nlattr **attrs, 1572 struct nlattr **tb_rxsc, 1573 struct nlattr **tb_sa, 1574 struct net_device **devp, 1575 struct macsec_secy **secyp, 1576 struct macsec_rx_sc **scp, 1577 u8 *assoc_num) 1578 { 1579 struct macsec_rx_sc *rx_sc; 1580 struct macsec_rx_sa *rx_sa; 1581 1582 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1583 return ERR_PTR(-EINVAL); 1584 1585 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1586 if (*assoc_num >= MACSEC_NUM_AN) 1587 return ERR_PTR(-EINVAL); 1588 1589 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1590 if (IS_ERR(rx_sc)) 1591 return ERR_CAST(rx_sc); 1592 1593 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1594 if (!rx_sa) 1595 return ERR_PTR(-ENODEV); 1596 1597 *scp = rx_sc; 1598 return rx_sa; 1599 } 1600 1601 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1602 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1603 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1604 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1605 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED }, 1606 }; 1607 1608 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1609 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1610 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, 1611 }; 1612 1613 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1614 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, 1615 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, 1616 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4), 1617 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY, 1618 .len = MACSEC_KEYID_LEN, }, 1619 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1620 .len = MACSEC_MAX_KEY_LEN, }, 1621 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 }, 1622 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY, 1623 .len = MACSEC_SALT_LEN, }, 1624 }; 1625 1626 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = { 1627 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 }, 1628 }; 1629 1630 /* Offloads an operation to a device driver */ 1631 static int macsec_offload(int (* const func)(struct macsec_context *), 1632 struct macsec_context *ctx) 1633 { 1634 int ret; 1635 1636 if (unlikely(!func)) 1637 return 0; 1638 1639 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1640 mutex_lock(&ctx->phydev->lock); 1641 1642 /* Phase I: prepare. The drive should fail here if there are going to be 1643 * issues in the commit phase. 1644 */ 1645 ctx->prepare = true; 1646 ret = (*func)(ctx); 1647 if (ret) 1648 goto phy_unlock; 1649 1650 /* Phase II: commit. This step cannot fail. */ 1651 ctx->prepare = false; 1652 ret = (*func)(ctx); 1653 /* This should never happen: commit is not allowed to fail */ 1654 if (unlikely(ret)) 1655 WARN(1, "MACsec offloading commit failed (%d)\n", ret); 1656 1657 phy_unlock: 1658 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1659 mutex_unlock(&ctx->phydev->lock); 1660 1661 return ret; 1662 } 1663 1664 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1665 { 1666 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1667 return -EINVAL; 1668 1669 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL)) 1670 return -EINVAL; 1671 1672 return 0; 1673 } 1674 1675 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1676 { 1677 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1678 return -EINVAL; 1679 1680 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL)) 1681 return -EINVAL; 1682 1683 return 0; 1684 } 1685 1686 static bool validate_add_rxsa(struct nlattr **attrs) 1687 { 1688 if (!attrs[MACSEC_SA_ATTR_AN] || 1689 !attrs[MACSEC_SA_ATTR_KEY] || 1690 !attrs[MACSEC_SA_ATTR_KEYID]) 1691 return false; 1692 1693 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1694 return false; 1695 1696 if (attrs[MACSEC_SA_ATTR_PN] && 1697 *(u64 *)nla_data(attrs[MACSEC_SA_ATTR_PN]) == 0) 1698 return false; 1699 1700 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1701 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1702 return false; 1703 } 1704 1705 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1706 return false; 1707 1708 return true; 1709 } 1710 1711 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1712 { 1713 struct net_device *dev; 1714 struct nlattr **attrs = info->attrs; 1715 struct macsec_secy *secy; 1716 struct macsec_rx_sc *rx_sc; 1717 struct macsec_rx_sa *rx_sa; 1718 unsigned char assoc_num; 1719 int pn_len; 1720 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1721 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1722 int err; 1723 1724 if (!attrs[MACSEC_ATTR_IFINDEX]) 1725 return -EINVAL; 1726 1727 if (parse_sa_config(attrs, tb_sa)) 1728 return -EINVAL; 1729 1730 if (parse_rxsc_config(attrs, tb_rxsc)) 1731 return -EINVAL; 1732 1733 if (!validate_add_rxsa(tb_sa)) 1734 return -EINVAL; 1735 1736 rtnl_lock(); 1737 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1738 if (IS_ERR(rx_sc)) { 1739 rtnl_unlock(); 1740 return PTR_ERR(rx_sc); 1741 } 1742 1743 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1744 1745 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1746 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1747 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1748 rtnl_unlock(); 1749 return -EINVAL; 1750 } 1751 1752 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1753 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1754 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n", 1755 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1756 rtnl_unlock(); 1757 return -EINVAL; 1758 } 1759 1760 if (secy->xpn) { 1761 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 1762 rtnl_unlock(); 1763 return -EINVAL; 1764 } 1765 1766 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 1767 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n", 1768 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 1769 MACSEC_SA_ATTR_SALT); 1770 rtnl_unlock(); 1771 return -EINVAL; 1772 } 1773 } 1774 1775 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1776 if (rx_sa) { 1777 rtnl_unlock(); 1778 return -EBUSY; 1779 } 1780 1781 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1782 if (!rx_sa) { 1783 rtnl_unlock(); 1784 return -ENOMEM; 1785 } 1786 1787 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1788 secy->key_len, secy->icv_len); 1789 if (err < 0) { 1790 kfree(rx_sa); 1791 rtnl_unlock(); 1792 return err; 1793 } 1794 1795 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1796 spin_lock_bh(&rx_sa->lock); 1797 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 1798 spin_unlock_bh(&rx_sa->lock); 1799 } 1800 1801 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1802 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1803 1804 rx_sa->sc = rx_sc; 1805 1806 /* If h/w offloading is available, propagate to the device */ 1807 if (macsec_is_offloaded(netdev_priv(dev))) { 1808 const struct macsec_ops *ops; 1809 struct macsec_context ctx; 1810 1811 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1812 if (!ops) { 1813 err = -EOPNOTSUPP; 1814 goto cleanup; 1815 } 1816 1817 ctx.sa.assoc_num = assoc_num; 1818 ctx.sa.rx_sa = rx_sa; 1819 ctx.secy = secy; 1820 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1821 MACSEC_KEYID_LEN); 1822 1823 err = macsec_offload(ops->mdo_add_rxsa, &ctx); 1824 if (err) 1825 goto cleanup; 1826 } 1827 1828 if (secy->xpn) { 1829 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 1830 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 1831 MACSEC_SALT_LEN); 1832 } 1833 1834 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1835 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1836 1837 rtnl_unlock(); 1838 1839 return 0; 1840 1841 cleanup: 1842 kfree(rx_sa); 1843 rtnl_unlock(); 1844 return err; 1845 } 1846 1847 static bool validate_add_rxsc(struct nlattr **attrs) 1848 { 1849 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1850 return false; 1851 1852 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1853 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1854 return false; 1855 } 1856 1857 return true; 1858 } 1859 1860 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1861 { 1862 struct net_device *dev; 1863 sci_t sci = MACSEC_UNDEF_SCI; 1864 struct nlattr **attrs = info->attrs; 1865 struct macsec_rx_sc *rx_sc; 1866 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1867 struct macsec_secy *secy; 1868 bool was_active; 1869 int ret; 1870 1871 if (!attrs[MACSEC_ATTR_IFINDEX]) 1872 return -EINVAL; 1873 1874 if (parse_rxsc_config(attrs, tb_rxsc)) 1875 return -EINVAL; 1876 1877 if (!validate_add_rxsc(tb_rxsc)) 1878 return -EINVAL; 1879 1880 rtnl_lock(); 1881 dev = get_dev_from_nl(genl_info_net(info), attrs); 1882 if (IS_ERR(dev)) { 1883 rtnl_unlock(); 1884 return PTR_ERR(dev); 1885 } 1886 1887 secy = &macsec_priv(dev)->secy; 1888 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1889 1890 rx_sc = create_rx_sc(dev, sci); 1891 if (IS_ERR(rx_sc)) { 1892 rtnl_unlock(); 1893 return PTR_ERR(rx_sc); 1894 } 1895 1896 was_active = rx_sc->active; 1897 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1898 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1899 1900 if (macsec_is_offloaded(netdev_priv(dev))) { 1901 const struct macsec_ops *ops; 1902 struct macsec_context ctx; 1903 1904 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1905 if (!ops) { 1906 ret = -EOPNOTSUPP; 1907 goto cleanup; 1908 } 1909 1910 ctx.rx_sc = rx_sc; 1911 ctx.secy = secy; 1912 1913 ret = macsec_offload(ops->mdo_add_rxsc, &ctx); 1914 if (ret) 1915 goto cleanup; 1916 } 1917 1918 rtnl_unlock(); 1919 1920 return 0; 1921 1922 cleanup: 1923 rx_sc->active = was_active; 1924 rtnl_unlock(); 1925 return ret; 1926 } 1927 1928 static bool validate_add_txsa(struct nlattr **attrs) 1929 { 1930 if (!attrs[MACSEC_SA_ATTR_AN] || 1931 !attrs[MACSEC_SA_ATTR_PN] || 1932 !attrs[MACSEC_SA_ATTR_KEY] || 1933 !attrs[MACSEC_SA_ATTR_KEYID]) 1934 return false; 1935 1936 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1937 return false; 1938 1939 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1940 return false; 1941 1942 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1943 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1944 return false; 1945 } 1946 1947 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1948 return false; 1949 1950 return true; 1951 } 1952 1953 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1954 { 1955 struct net_device *dev; 1956 struct nlattr **attrs = info->attrs; 1957 struct macsec_secy *secy; 1958 struct macsec_tx_sc *tx_sc; 1959 struct macsec_tx_sa *tx_sa; 1960 unsigned char assoc_num; 1961 int pn_len; 1962 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1963 bool was_operational; 1964 int err; 1965 1966 if (!attrs[MACSEC_ATTR_IFINDEX]) 1967 return -EINVAL; 1968 1969 if (parse_sa_config(attrs, tb_sa)) 1970 return -EINVAL; 1971 1972 if (!validate_add_txsa(tb_sa)) 1973 return -EINVAL; 1974 1975 rtnl_lock(); 1976 dev = get_dev_from_nl(genl_info_net(info), attrs); 1977 if (IS_ERR(dev)) { 1978 rtnl_unlock(); 1979 return PTR_ERR(dev); 1980 } 1981 1982 secy = &macsec_priv(dev)->secy; 1983 tx_sc = &secy->tx_sc; 1984 1985 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1986 1987 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1988 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 1989 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1990 rtnl_unlock(); 1991 return -EINVAL; 1992 } 1993 1994 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1995 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1996 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n", 1997 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1998 rtnl_unlock(); 1999 return -EINVAL; 2000 } 2001 2002 if (secy->xpn) { 2003 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 2004 rtnl_unlock(); 2005 return -EINVAL; 2006 } 2007 2008 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 2009 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n", 2010 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 2011 MACSEC_SA_ATTR_SALT); 2012 rtnl_unlock(); 2013 return -EINVAL; 2014 } 2015 } 2016 2017 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 2018 if (tx_sa) { 2019 rtnl_unlock(); 2020 return -EBUSY; 2021 } 2022 2023 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 2024 if (!tx_sa) { 2025 rtnl_unlock(); 2026 return -ENOMEM; 2027 } 2028 2029 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2030 secy->key_len, secy->icv_len); 2031 if (err < 0) { 2032 kfree(tx_sa); 2033 rtnl_unlock(); 2034 return err; 2035 } 2036 2037 spin_lock_bh(&tx_sa->lock); 2038 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2039 spin_unlock_bh(&tx_sa->lock); 2040 2041 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2042 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2043 2044 was_operational = secy->operational; 2045 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 2046 secy->operational = true; 2047 2048 /* If h/w offloading is available, propagate to the device */ 2049 if (macsec_is_offloaded(netdev_priv(dev))) { 2050 const struct macsec_ops *ops; 2051 struct macsec_context ctx; 2052 2053 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2054 if (!ops) { 2055 err = -EOPNOTSUPP; 2056 goto cleanup; 2057 } 2058 2059 ctx.sa.assoc_num = assoc_num; 2060 ctx.sa.tx_sa = tx_sa; 2061 ctx.secy = secy; 2062 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2063 MACSEC_KEYID_LEN); 2064 2065 err = macsec_offload(ops->mdo_add_txsa, &ctx); 2066 if (err) 2067 goto cleanup; 2068 } 2069 2070 if (secy->xpn) { 2071 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 2072 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 2073 MACSEC_SALT_LEN); 2074 } 2075 2076 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 2077 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 2078 2079 rtnl_unlock(); 2080 2081 return 0; 2082 2083 cleanup: 2084 secy->operational = was_operational; 2085 kfree(tx_sa); 2086 rtnl_unlock(); 2087 return err; 2088 } 2089 2090 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 2091 { 2092 struct nlattr **attrs = info->attrs; 2093 struct net_device *dev; 2094 struct macsec_secy *secy; 2095 struct macsec_rx_sc *rx_sc; 2096 struct macsec_rx_sa *rx_sa; 2097 u8 assoc_num; 2098 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2099 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2100 int ret; 2101 2102 if (!attrs[MACSEC_ATTR_IFINDEX]) 2103 return -EINVAL; 2104 2105 if (parse_sa_config(attrs, tb_sa)) 2106 return -EINVAL; 2107 2108 if (parse_rxsc_config(attrs, tb_rxsc)) 2109 return -EINVAL; 2110 2111 rtnl_lock(); 2112 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2113 &dev, &secy, &rx_sc, &assoc_num); 2114 if (IS_ERR(rx_sa)) { 2115 rtnl_unlock(); 2116 return PTR_ERR(rx_sa); 2117 } 2118 2119 if (rx_sa->active) { 2120 rtnl_unlock(); 2121 return -EBUSY; 2122 } 2123 2124 /* If h/w offloading is available, propagate to the device */ 2125 if (macsec_is_offloaded(netdev_priv(dev))) { 2126 const struct macsec_ops *ops; 2127 struct macsec_context ctx; 2128 2129 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2130 if (!ops) { 2131 ret = -EOPNOTSUPP; 2132 goto cleanup; 2133 } 2134 2135 ctx.sa.assoc_num = assoc_num; 2136 ctx.sa.rx_sa = rx_sa; 2137 ctx.secy = secy; 2138 2139 ret = macsec_offload(ops->mdo_del_rxsa, &ctx); 2140 if (ret) 2141 goto cleanup; 2142 } 2143 2144 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 2145 clear_rx_sa(rx_sa); 2146 2147 rtnl_unlock(); 2148 2149 return 0; 2150 2151 cleanup: 2152 rtnl_unlock(); 2153 return ret; 2154 } 2155 2156 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 2157 { 2158 struct nlattr **attrs = info->attrs; 2159 struct net_device *dev; 2160 struct macsec_secy *secy; 2161 struct macsec_rx_sc *rx_sc; 2162 sci_t sci; 2163 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2164 int ret; 2165 2166 if (!attrs[MACSEC_ATTR_IFINDEX]) 2167 return -EINVAL; 2168 2169 if (parse_rxsc_config(attrs, tb_rxsc)) 2170 return -EINVAL; 2171 2172 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 2173 return -EINVAL; 2174 2175 rtnl_lock(); 2176 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 2177 if (IS_ERR(dev)) { 2178 rtnl_unlock(); 2179 return PTR_ERR(dev); 2180 } 2181 2182 secy = &macsec_priv(dev)->secy; 2183 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 2184 2185 rx_sc = del_rx_sc(secy, sci); 2186 if (!rx_sc) { 2187 rtnl_unlock(); 2188 return -ENODEV; 2189 } 2190 2191 /* If h/w offloading is available, propagate to the device */ 2192 if (macsec_is_offloaded(netdev_priv(dev))) { 2193 const struct macsec_ops *ops; 2194 struct macsec_context ctx; 2195 2196 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2197 if (!ops) { 2198 ret = -EOPNOTSUPP; 2199 goto cleanup; 2200 } 2201 2202 ctx.rx_sc = rx_sc; 2203 ctx.secy = secy; 2204 ret = macsec_offload(ops->mdo_del_rxsc, &ctx); 2205 if (ret) 2206 goto cleanup; 2207 } 2208 2209 free_rx_sc(rx_sc); 2210 rtnl_unlock(); 2211 2212 return 0; 2213 2214 cleanup: 2215 rtnl_unlock(); 2216 return ret; 2217 } 2218 2219 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 2220 { 2221 struct nlattr **attrs = info->attrs; 2222 struct net_device *dev; 2223 struct macsec_secy *secy; 2224 struct macsec_tx_sc *tx_sc; 2225 struct macsec_tx_sa *tx_sa; 2226 u8 assoc_num; 2227 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2228 int ret; 2229 2230 if (!attrs[MACSEC_ATTR_IFINDEX]) 2231 return -EINVAL; 2232 2233 if (parse_sa_config(attrs, tb_sa)) 2234 return -EINVAL; 2235 2236 rtnl_lock(); 2237 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2238 &dev, &secy, &tx_sc, &assoc_num); 2239 if (IS_ERR(tx_sa)) { 2240 rtnl_unlock(); 2241 return PTR_ERR(tx_sa); 2242 } 2243 2244 if (tx_sa->active) { 2245 rtnl_unlock(); 2246 return -EBUSY; 2247 } 2248 2249 /* If h/w offloading is available, propagate to the device */ 2250 if (macsec_is_offloaded(netdev_priv(dev))) { 2251 const struct macsec_ops *ops; 2252 struct macsec_context ctx; 2253 2254 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2255 if (!ops) { 2256 ret = -EOPNOTSUPP; 2257 goto cleanup; 2258 } 2259 2260 ctx.sa.assoc_num = assoc_num; 2261 ctx.sa.tx_sa = tx_sa; 2262 ctx.secy = secy; 2263 2264 ret = macsec_offload(ops->mdo_del_txsa, &ctx); 2265 if (ret) 2266 goto cleanup; 2267 } 2268 2269 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 2270 clear_tx_sa(tx_sa); 2271 2272 rtnl_unlock(); 2273 2274 return 0; 2275 2276 cleanup: 2277 rtnl_unlock(); 2278 return ret; 2279 } 2280 2281 static bool validate_upd_sa(struct nlattr **attrs) 2282 { 2283 if (!attrs[MACSEC_SA_ATTR_AN] || 2284 attrs[MACSEC_SA_ATTR_KEY] || 2285 attrs[MACSEC_SA_ATTR_KEYID] || 2286 attrs[MACSEC_SA_ATTR_SSCI] || 2287 attrs[MACSEC_SA_ATTR_SALT]) 2288 return false; 2289 2290 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 2291 return false; 2292 2293 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 2294 return false; 2295 2296 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 2297 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 2298 return false; 2299 } 2300 2301 return true; 2302 } 2303 2304 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2305 { 2306 struct nlattr **attrs = info->attrs; 2307 struct net_device *dev; 2308 struct macsec_secy *secy; 2309 struct macsec_tx_sc *tx_sc; 2310 struct macsec_tx_sa *tx_sa; 2311 u8 assoc_num; 2312 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2313 bool was_operational, was_active; 2314 pn_t prev_pn; 2315 int ret = 0; 2316 2317 prev_pn.full64 = 0; 2318 2319 if (!attrs[MACSEC_ATTR_IFINDEX]) 2320 return -EINVAL; 2321 2322 if (parse_sa_config(attrs, tb_sa)) 2323 return -EINVAL; 2324 2325 if (!validate_upd_sa(tb_sa)) 2326 return -EINVAL; 2327 2328 rtnl_lock(); 2329 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2330 &dev, &secy, &tx_sc, &assoc_num); 2331 if (IS_ERR(tx_sa)) { 2332 rtnl_unlock(); 2333 return PTR_ERR(tx_sa); 2334 } 2335 2336 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2337 int pn_len; 2338 2339 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2340 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2341 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n", 2342 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2343 rtnl_unlock(); 2344 return -EINVAL; 2345 } 2346 2347 spin_lock_bh(&tx_sa->lock); 2348 prev_pn = tx_sa->next_pn_halves; 2349 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2350 spin_unlock_bh(&tx_sa->lock); 2351 } 2352 2353 was_active = tx_sa->active; 2354 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2355 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2356 2357 was_operational = secy->operational; 2358 if (assoc_num == tx_sc->encoding_sa) 2359 secy->operational = tx_sa->active; 2360 2361 /* If h/w offloading is available, propagate to the device */ 2362 if (macsec_is_offloaded(netdev_priv(dev))) { 2363 const struct macsec_ops *ops; 2364 struct macsec_context ctx; 2365 2366 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2367 if (!ops) { 2368 ret = -EOPNOTSUPP; 2369 goto cleanup; 2370 } 2371 2372 ctx.sa.assoc_num = assoc_num; 2373 ctx.sa.tx_sa = tx_sa; 2374 ctx.secy = secy; 2375 2376 ret = macsec_offload(ops->mdo_upd_txsa, &ctx); 2377 if (ret) 2378 goto cleanup; 2379 } 2380 2381 rtnl_unlock(); 2382 2383 return 0; 2384 2385 cleanup: 2386 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2387 spin_lock_bh(&tx_sa->lock); 2388 tx_sa->next_pn_halves = prev_pn; 2389 spin_unlock_bh(&tx_sa->lock); 2390 } 2391 tx_sa->active = was_active; 2392 secy->operational = was_operational; 2393 rtnl_unlock(); 2394 return ret; 2395 } 2396 2397 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2398 { 2399 struct nlattr **attrs = info->attrs; 2400 struct net_device *dev; 2401 struct macsec_secy *secy; 2402 struct macsec_rx_sc *rx_sc; 2403 struct macsec_rx_sa *rx_sa; 2404 u8 assoc_num; 2405 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2406 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2407 bool was_active; 2408 pn_t prev_pn; 2409 int ret = 0; 2410 2411 prev_pn.full64 = 0; 2412 2413 if (!attrs[MACSEC_ATTR_IFINDEX]) 2414 return -EINVAL; 2415 2416 if (parse_rxsc_config(attrs, tb_rxsc)) 2417 return -EINVAL; 2418 2419 if (parse_sa_config(attrs, tb_sa)) 2420 return -EINVAL; 2421 2422 if (!validate_upd_sa(tb_sa)) 2423 return -EINVAL; 2424 2425 rtnl_lock(); 2426 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2427 &dev, &secy, &rx_sc, &assoc_num); 2428 if (IS_ERR(rx_sa)) { 2429 rtnl_unlock(); 2430 return PTR_ERR(rx_sa); 2431 } 2432 2433 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2434 int pn_len; 2435 2436 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2437 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2438 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n", 2439 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2440 rtnl_unlock(); 2441 return -EINVAL; 2442 } 2443 2444 spin_lock_bh(&rx_sa->lock); 2445 prev_pn = rx_sa->next_pn_halves; 2446 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2447 spin_unlock_bh(&rx_sa->lock); 2448 } 2449 2450 was_active = rx_sa->active; 2451 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2452 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2453 2454 /* If h/w offloading is available, propagate to the device */ 2455 if (macsec_is_offloaded(netdev_priv(dev))) { 2456 const struct macsec_ops *ops; 2457 struct macsec_context ctx; 2458 2459 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2460 if (!ops) { 2461 ret = -EOPNOTSUPP; 2462 goto cleanup; 2463 } 2464 2465 ctx.sa.assoc_num = assoc_num; 2466 ctx.sa.rx_sa = rx_sa; 2467 ctx.secy = secy; 2468 2469 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx); 2470 if (ret) 2471 goto cleanup; 2472 } 2473 2474 rtnl_unlock(); 2475 return 0; 2476 2477 cleanup: 2478 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2479 spin_lock_bh(&rx_sa->lock); 2480 rx_sa->next_pn_halves = prev_pn; 2481 spin_unlock_bh(&rx_sa->lock); 2482 } 2483 rx_sa->active = was_active; 2484 rtnl_unlock(); 2485 return ret; 2486 } 2487 2488 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2489 { 2490 struct nlattr **attrs = info->attrs; 2491 struct net_device *dev; 2492 struct macsec_secy *secy; 2493 struct macsec_rx_sc *rx_sc; 2494 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2495 unsigned int prev_n_rx_sc; 2496 bool was_active; 2497 int ret; 2498 2499 if (!attrs[MACSEC_ATTR_IFINDEX]) 2500 return -EINVAL; 2501 2502 if (parse_rxsc_config(attrs, tb_rxsc)) 2503 return -EINVAL; 2504 2505 if (!validate_add_rxsc(tb_rxsc)) 2506 return -EINVAL; 2507 2508 rtnl_lock(); 2509 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2510 if (IS_ERR(rx_sc)) { 2511 rtnl_unlock(); 2512 return PTR_ERR(rx_sc); 2513 } 2514 2515 was_active = rx_sc->active; 2516 prev_n_rx_sc = secy->n_rx_sc; 2517 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2518 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2519 2520 if (rx_sc->active != new) 2521 secy->n_rx_sc += new ? 1 : -1; 2522 2523 rx_sc->active = new; 2524 } 2525 2526 /* If h/w offloading is available, propagate to the device */ 2527 if (macsec_is_offloaded(netdev_priv(dev))) { 2528 const struct macsec_ops *ops; 2529 struct macsec_context ctx; 2530 2531 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2532 if (!ops) { 2533 ret = -EOPNOTSUPP; 2534 goto cleanup; 2535 } 2536 2537 ctx.rx_sc = rx_sc; 2538 ctx.secy = secy; 2539 2540 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx); 2541 if (ret) 2542 goto cleanup; 2543 } 2544 2545 rtnl_unlock(); 2546 2547 return 0; 2548 2549 cleanup: 2550 secy->n_rx_sc = prev_n_rx_sc; 2551 rx_sc->active = was_active; 2552 rtnl_unlock(); 2553 return ret; 2554 } 2555 2556 static bool macsec_is_configured(struct macsec_dev *macsec) 2557 { 2558 struct macsec_secy *secy = &macsec->secy; 2559 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2560 int i; 2561 2562 if (secy->n_rx_sc > 0) 2563 return true; 2564 2565 for (i = 0; i < MACSEC_NUM_AN; i++) 2566 if (tx_sc->sa[i]) 2567 return true; 2568 2569 return false; 2570 } 2571 2572 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info) 2573 { 2574 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1]; 2575 enum macsec_offload offload, prev_offload; 2576 int (*func)(struct macsec_context *ctx); 2577 struct nlattr **attrs = info->attrs; 2578 struct net_device *dev; 2579 const struct macsec_ops *ops; 2580 struct macsec_context ctx; 2581 struct macsec_dev *macsec; 2582 int ret; 2583 2584 if (!attrs[MACSEC_ATTR_IFINDEX]) 2585 return -EINVAL; 2586 2587 if (!attrs[MACSEC_ATTR_OFFLOAD]) 2588 return -EINVAL; 2589 2590 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX, 2591 attrs[MACSEC_ATTR_OFFLOAD], 2592 macsec_genl_offload_policy, NULL)) 2593 return -EINVAL; 2594 2595 dev = get_dev_from_nl(genl_info_net(info), attrs); 2596 if (IS_ERR(dev)) 2597 return PTR_ERR(dev); 2598 macsec = macsec_priv(dev); 2599 2600 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) 2601 return -EINVAL; 2602 2603 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]); 2604 if (macsec->offload == offload) 2605 return 0; 2606 2607 /* Check if the offloading mode is supported by the underlying layers */ 2608 if (offload != MACSEC_OFFLOAD_OFF && 2609 !macsec_check_offload(offload, macsec)) 2610 return -EOPNOTSUPP; 2611 2612 /* Check if the net device is busy. */ 2613 if (netif_running(dev)) 2614 return -EBUSY; 2615 2616 rtnl_lock(); 2617 2618 prev_offload = macsec->offload; 2619 macsec->offload = offload; 2620 2621 /* Check if the device already has rules configured: we do not support 2622 * rules migration. 2623 */ 2624 if (macsec_is_configured(macsec)) { 2625 ret = -EBUSY; 2626 goto rollback; 2627 } 2628 2629 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload, 2630 macsec, &ctx); 2631 if (!ops) { 2632 ret = -EOPNOTSUPP; 2633 goto rollback; 2634 } 2635 2636 if (prev_offload == MACSEC_OFFLOAD_OFF) 2637 func = ops->mdo_add_secy; 2638 else 2639 func = ops->mdo_del_secy; 2640 2641 ctx.secy = &macsec->secy; 2642 ret = macsec_offload(func, &ctx); 2643 if (ret) 2644 goto rollback; 2645 2646 /* Force features update, since they are different for SW MACSec and 2647 * HW offloading cases. 2648 */ 2649 netdev_update_features(dev); 2650 2651 rtnl_unlock(); 2652 return 0; 2653 2654 rollback: 2655 macsec->offload = prev_offload; 2656 2657 rtnl_unlock(); 2658 return ret; 2659 } 2660 2661 static void get_tx_sa_stats(struct net_device *dev, int an, 2662 struct macsec_tx_sa *tx_sa, 2663 struct macsec_tx_sa_stats *sum) 2664 { 2665 struct macsec_dev *macsec = macsec_priv(dev); 2666 int cpu; 2667 2668 /* If h/w offloading is available, propagate to the device */ 2669 if (macsec_is_offloaded(macsec)) { 2670 const struct macsec_ops *ops; 2671 struct macsec_context ctx; 2672 2673 ops = macsec_get_ops(macsec, &ctx); 2674 if (ops) { 2675 ctx.sa.assoc_num = an; 2676 ctx.sa.tx_sa = tx_sa; 2677 ctx.stats.tx_sa_stats = sum; 2678 ctx.secy = &macsec_priv(dev)->secy; 2679 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx); 2680 } 2681 return; 2682 } 2683 2684 for_each_possible_cpu(cpu) { 2685 const struct macsec_tx_sa_stats *stats = 2686 per_cpu_ptr(tx_sa->stats, cpu); 2687 2688 sum->OutPktsProtected += stats->OutPktsProtected; 2689 sum->OutPktsEncrypted += stats->OutPktsEncrypted; 2690 } 2691 } 2692 2693 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum) 2694 { 2695 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, 2696 sum->OutPktsProtected) || 2697 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2698 sum->OutPktsEncrypted)) 2699 return -EMSGSIZE; 2700 2701 return 0; 2702 } 2703 2704 static void get_rx_sa_stats(struct net_device *dev, 2705 struct macsec_rx_sc *rx_sc, int an, 2706 struct macsec_rx_sa *rx_sa, 2707 struct macsec_rx_sa_stats *sum) 2708 { 2709 struct macsec_dev *macsec = macsec_priv(dev); 2710 int cpu; 2711 2712 /* If h/w offloading is available, propagate to the device */ 2713 if (macsec_is_offloaded(macsec)) { 2714 const struct macsec_ops *ops; 2715 struct macsec_context ctx; 2716 2717 ops = macsec_get_ops(macsec, &ctx); 2718 if (ops) { 2719 ctx.sa.assoc_num = an; 2720 ctx.sa.rx_sa = rx_sa; 2721 ctx.stats.rx_sa_stats = sum; 2722 ctx.secy = &macsec_priv(dev)->secy; 2723 ctx.rx_sc = rx_sc; 2724 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx); 2725 } 2726 return; 2727 } 2728 2729 for_each_possible_cpu(cpu) { 2730 const struct macsec_rx_sa_stats *stats = 2731 per_cpu_ptr(rx_sa->stats, cpu); 2732 2733 sum->InPktsOK += stats->InPktsOK; 2734 sum->InPktsInvalid += stats->InPktsInvalid; 2735 sum->InPktsNotValid += stats->InPktsNotValid; 2736 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA; 2737 sum->InPktsUnusedSA += stats->InPktsUnusedSA; 2738 } 2739 } 2740 2741 static int copy_rx_sa_stats(struct sk_buff *skb, 2742 struct macsec_rx_sa_stats *sum) 2743 { 2744 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) || 2745 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, 2746 sum->InPktsInvalid) || 2747 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, 2748 sum->InPktsNotValid) || 2749 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2750 sum->InPktsNotUsingSA) || 2751 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, 2752 sum->InPktsUnusedSA)) 2753 return -EMSGSIZE; 2754 2755 return 0; 2756 } 2757 2758 static void get_rx_sc_stats(struct net_device *dev, 2759 struct macsec_rx_sc *rx_sc, 2760 struct macsec_rx_sc_stats *sum) 2761 { 2762 struct macsec_dev *macsec = macsec_priv(dev); 2763 int cpu; 2764 2765 /* If h/w offloading is available, propagate to the device */ 2766 if (macsec_is_offloaded(macsec)) { 2767 const struct macsec_ops *ops; 2768 struct macsec_context ctx; 2769 2770 ops = macsec_get_ops(macsec, &ctx); 2771 if (ops) { 2772 ctx.stats.rx_sc_stats = sum; 2773 ctx.secy = &macsec_priv(dev)->secy; 2774 ctx.rx_sc = rx_sc; 2775 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx); 2776 } 2777 return; 2778 } 2779 2780 for_each_possible_cpu(cpu) { 2781 const struct pcpu_rx_sc_stats *stats; 2782 struct macsec_rx_sc_stats tmp; 2783 unsigned int start; 2784 2785 stats = per_cpu_ptr(rx_sc->stats, cpu); 2786 do { 2787 start = u64_stats_fetch_begin_irq(&stats->syncp); 2788 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2789 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2790 2791 sum->InOctetsValidated += tmp.InOctetsValidated; 2792 sum->InOctetsDecrypted += tmp.InOctetsDecrypted; 2793 sum->InPktsUnchecked += tmp.InPktsUnchecked; 2794 sum->InPktsDelayed += tmp.InPktsDelayed; 2795 sum->InPktsOK += tmp.InPktsOK; 2796 sum->InPktsInvalid += tmp.InPktsInvalid; 2797 sum->InPktsLate += tmp.InPktsLate; 2798 sum->InPktsNotValid += tmp.InPktsNotValid; 2799 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2800 sum->InPktsUnusedSA += tmp.InPktsUnusedSA; 2801 } 2802 } 2803 2804 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum) 2805 { 2806 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2807 sum->InOctetsValidated, 2808 MACSEC_RXSC_STATS_ATTR_PAD) || 2809 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2810 sum->InOctetsDecrypted, 2811 MACSEC_RXSC_STATS_ATTR_PAD) || 2812 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2813 sum->InPktsUnchecked, 2814 MACSEC_RXSC_STATS_ATTR_PAD) || 2815 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2816 sum->InPktsDelayed, 2817 MACSEC_RXSC_STATS_ATTR_PAD) || 2818 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2819 sum->InPktsOK, 2820 MACSEC_RXSC_STATS_ATTR_PAD) || 2821 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2822 sum->InPktsInvalid, 2823 MACSEC_RXSC_STATS_ATTR_PAD) || 2824 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2825 sum->InPktsLate, 2826 MACSEC_RXSC_STATS_ATTR_PAD) || 2827 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2828 sum->InPktsNotValid, 2829 MACSEC_RXSC_STATS_ATTR_PAD) || 2830 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2831 sum->InPktsNotUsingSA, 2832 MACSEC_RXSC_STATS_ATTR_PAD) || 2833 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2834 sum->InPktsUnusedSA, 2835 MACSEC_RXSC_STATS_ATTR_PAD)) 2836 return -EMSGSIZE; 2837 2838 return 0; 2839 } 2840 2841 static void get_tx_sc_stats(struct net_device *dev, 2842 struct macsec_tx_sc_stats *sum) 2843 { 2844 struct macsec_dev *macsec = macsec_priv(dev); 2845 int cpu; 2846 2847 /* If h/w offloading is available, propagate to the device */ 2848 if (macsec_is_offloaded(macsec)) { 2849 const struct macsec_ops *ops; 2850 struct macsec_context ctx; 2851 2852 ops = macsec_get_ops(macsec, &ctx); 2853 if (ops) { 2854 ctx.stats.tx_sc_stats = sum; 2855 ctx.secy = &macsec_priv(dev)->secy; 2856 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx); 2857 } 2858 return; 2859 } 2860 2861 for_each_possible_cpu(cpu) { 2862 const struct pcpu_tx_sc_stats *stats; 2863 struct macsec_tx_sc_stats tmp; 2864 unsigned int start; 2865 2866 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu); 2867 do { 2868 start = u64_stats_fetch_begin_irq(&stats->syncp); 2869 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2870 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2871 2872 sum->OutPktsProtected += tmp.OutPktsProtected; 2873 sum->OutPktsEncrypted += tmp.OutPktsEncrypted; 2874 sum->OutOctetsProtected += tmp.OutOctetsProtected; 2875 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2876 } 2877 } 2878 2879 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum) 2880 { 2881 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2882 sum->OutPktsProtected, 2883 MACSEC_TXSC_STATS_ATTR_PAD) || 2884 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2885 sum->OutPktsEncrypted, 2886 MACSEC_TXSC_STATS_ATTR_PAD) || 2887 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2888 sum->OutOctetsProtected, 2889 MACSEC_TXSC_STATS_ATTR_PAD) || 2890 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2891 sum->OutOctetsEncrypted, 2892 MACSEC_TXSC_STATS_ATTR_PAD)) 2893 return -EMSGSIZE; 2894 2895 return 0; 2896 } 2897 2898 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum) 2899 { 2900 struct macsec_dev *macsec = macsec_priv(dev); 2901 int cpu; 2902 2903 /* If h/w offloading is available, propagate to the device */ 2904 if (macsec_is_offloaded(macsec)) { 2905 const struct macsec_ops *ops; 2906 struct macsec_context ctx; 2907 2908 ops = macsec_get_ops(macsec, &ctx); 2909 if (ops) { 2910 ctx.stats.dev_stats = sum; 2911 ctx.secy = &macsec_priv(dev)->secy; 2912 macsec_offload(ops->mdo_get_dev_stats, &ctx); 2913 } 2914 return; 2915 } 2916 2917 for_each_possible_cpu(cpu) { 2918 const struct pcpu_secy_stats *stats; 2919 struct macsec_dev_stats tmp; 2920 unsigned int start; 2921 2922 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu); 2923 do { 2924 start = u64_stats_fetch_begin_irq(&stats->syncp); 2925 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2926 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2927 2928 sum->OutPktsUntagged += tmp.OutPktsUntagged; 2929 sum->InPktsUntagged += tmp.InPktsUntagged; 2930 sum->OutPktsTooLong += tmp.OutPktsTooLong; 2931 sum->InPktsNoTag += tmp.InPktsNoTag; 2932 sum->InPktsBadTag += tmp.InPktsBadTag; 2933 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2934 sum->InPktsNoSCI += tmp.InPktsNoSCI; 2935 sum->InPktsOverrun += tmp.InPktsOverrun; 2936 } 2937 } 2938 2939 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum) 2940 { 2941 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 2942 sum->OutPktsUntagged, 2943 MACSEC_SECY_STATS_ATTR_PAD) || 2944 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 2945 sum->InPktsUntagged, 2946 MACSEC_SECY_STATS_ATTR_PAD) || 2947 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 2948 sum->OutPktsTooLong, 2949 MACSEC_SECY_STATS_ATTR_PAD) || 2950 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 2951 sum->InPktsNoTag, 2952 MACSEC_SECY_STATS_ATTR_PAD) || 2953 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 2954 sum->InPktsBadTag, 2955 MACSEC_SECY_STATS_ATTR_PAD) || 2956 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 2957 sum->InPktsUnknownSCI, 2958 MACSEC_SECY_STATS_ATTR_PAD) || 2959 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 2960 sum->InPktsNoSCI, 2961 MACSEC_SECY_STATS_ATTR_PAD) || 2962 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 2963 sum->InPktsOverrun, 2964 MACSEC_SECY_STATS_ATTR_PAD)) 2965 return -EMSGSIZE; 2966 2967 return 0; 2968 } 2969 2970 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 2971 { 2972 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2973 struct nlattr *secy_nest = nla_nest_start_noflag(skb, 2974 MACSEC_ATTR_SECY); 2975 u64 csid; 2976 2977 if (!secy_nest) 2978 return 1; 2979 2980 switch (secy->key_len) { 2981 case MACSEC_GCM_AES_128_SAK_LEN: 2982 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 2983 break; 2984 case MACSEC_GCM_AES_256_SAK_LEN: 2985 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 2986 break; 2987 default: 2988 goto cancel; 2989 } 2990 2991 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 2992 MACSEC_SECY_ATTR_PAD) || 2993 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 2994 csid, MACSEC_SECY_ATTR_PAD) || 2995 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 2996 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 2997 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 2998 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 2999 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 3000 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 3001 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 3002 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 3003 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 3004 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 3005 goto cancel; 3006 3007 if (secy->replay_protect) { 3008 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 3009 goto cancel; 3010 } 3011 3012 nla_nest_end(skb, secy_nest); 3013 return 0; 3014 3015 cancel: 3016 nla_nest_cancel(skb, secy_nest); 3017 return 1; 3018 } 3019 3020 static noinline_for_stack int 3021 dump_secy(struct macsec_secy *secy, struct net_device *dev, 3022 struct sk_buff *skb, struct netlink_callback *cb) 3023 { 3024 struct macsec_tx_sc_stats tx_sc_stats = {0, }; 3025 struct macsec_tx_sa_stats tx_sa_stats = {0, }; 3026 struct macsec_rx_sc_stats rx_sc_stats = {0, }; 3027 struct macsec_rx_sa_stats rx_sa_stats = {0, }; 3028 struct macsec_dev *macsec = netdev_priv(dev); 3029 struct macsec_dev_stats dev_stats = {0, }; 3030 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3031 struct nlattr *txsa_list, *rxsc_list; 3032 struct macsec_rx_sc *rx_sc; 3033 struct nlattr *attr; 3034 void *hdr; 3035 int i, j; 3036 3037 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3038 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 3039 if (!hdr) 3040 return -EMSGSIZE; 3041 3042 genl_dump_check_consistent(cb, hdr); 3043 3044 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 3045 goto nla_put_failure; 3046 3047 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD); 3048 if (!attr) 3049 goto nla_put_failure; 3050 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload)) 3051 goto nla_put_failure; 3052 nla_nest_end(skb, attr); 3053 3054 if (nla_put_secy(secy, skb)) 3055 goto nla_put_failure; 3056 3057 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS); 3058 if (!attr) 3059 goto nla_put_failure; 3060 3061 get_tx_sc_stats(dev, &tx_sc_stats); 3062 if (copy_tx_sc_stats(skb, &tx_sc_stats)) { 3063 nla_nest_cancel(skb, attr); 3064 goto nla_put_failure; 3065 } 3066 nla_nest_end(skb, attr); 3067 3068 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS); 3069 if (!attr) 3070 goto nla_put_failure; 3071 get_secy_stats(dev, &dev_stats); 3072 if (copy_secy_stats(skb, &dev_stats)) { 3073 nla_nest_cancel(skb, attr); 3074 goto nla_put_failure; 3075 } 3076 nla_nest_end(skb, attr); 3077 3078 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST); 3079 if (!txsa_list) 3080 goto nla_put_failure; 3081 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 3082 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 3083 struct nlattr *txsa_nest; 3084 u64 pn; 3085 int pn_len; 3086 3087 if (!tx_sa) 3088 continue; 3089 3090 txsa_nest = nla_nest_start_noflag(skb, j++); 3091 if (!txsa_nest) { 3092 nla_nest_cancel(skb, txsa_list); 3093 goto nla_put_failure; 3094 } 3095 3096 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS); 3097 if (!attr) { 3098 nla_nest_cancel(skb, txsa_nest); 3099 nla_nest_cancel(skb, txsa_list); 3100 goto nla_put_failure; 3101 } 3102 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats)); 3103 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats); 3104 if (copy_tx_sa_stats(skb, &tx_sa_stats)) { 3105 nla_nest_cancel(skb, attr); 3106 nla_nest_cancel(skb, txsa_nest); 3107 nla_nest_cancel(skb, txsa_list); 3108 goto nla_put_failure; 3109 } 3110 nla_nest_end(skb, attr); 3111 3112 if (secy->xpn) { 3113 pn = tx_sa->next_pn; 3114 pn_len = MACSEC_XPN_PN_LEN; 3115 } else { 3116 pn = tx_sa->next_pn_halves.lower; 3117 pn_len = MACSEC_DEFAULT_PN_LEN; 3118 } 3119 3120 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3121 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3122 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 3123 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) || 3124 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 3125 nla_nest_cancel(skb, txsa_nest); 3126 nla_nest_cancel(skb, txsa_list); 3127 goto nla_put_failure; 3128 } 3129 3130 nla_nest_end(skb, txsa_nest); 3131 } 3132 nla_nest_end(skb, txsa_list); 3133 3134 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST); 3135 if (!rxsc_list) 3136 goto nla_put_failure; 3137 3138 j = 1; 3139 for_each_rxsc_rtnl(secy, rx_sc) { 3140 int k; 3141 struct nlattr *rxsa_list; 3142 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++); 3143 3144 if (!rxsc_nest) { 3145 nla_nest_cancel(skb, rxsc_list); 3146 goto nla_put_failure; 3147 } 3148 3149 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 3150 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 3151 MACSEC_RXSC_ATTR_PAD)) { 3152 nla_nest_cancel(skb, rxsc_nest); 3153 nla_nest_cancel(skb, rxsc_list); 3154 goto nla_put_failure; 3155 } 3156 3157 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS); 3158 if (!attr) { 3159 nla_nest_cancel(skb, rxsc_nest); 3160 nla_nest_cancel(skb, rxsc_list); 3161 goto nla_put_failure; 3162 } 3163 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats)); 3164 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats); 3165 if (copy_rx_sc_stats(skb, &rx_sc_stats)) { 3166 nla_nest_cancel(skb, attr); 3167 nla_nest_cancel(skb, rxsc_nest); 3168 nla_nest_cancel(skb, rxsc_list); 3169 goto nla_put_failure; 3170 } 3171 nla_nest_end(skb, attr); 3172 3173 rxsa_list = nla_nest_start_noflag(skb, 3174 MACSEC_RXSC_ATTR_SA_LIST); 3175 if (!rxsa_list) { 3176 nla_nest_cancel(skb, rxsc_nest); 3177 nla_nest_cancel(skb, rxsc_list); 3178 goto nla_put_failure; 3179 } 3180 3181 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 3182 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 3183 struct nlattr *rxsa_nest; 3184 u64 pn; 3185 int pn_len; 3186 3187 if (!rx_sa) 3188 continue; 3189 3190 rxsa_nest = nla_nest_start_noflag(skb, k++); 3191 if (!rxsa_nest) { 3192 nla_nest_cancel(skb, rxsa_list); 3193 nla_nest_cancel(skb, rxsc_nest); 3194 nla_nest_cancel(skb, rxsc_list); 3195 goto nla_put_failure; 3196 } 3197 3198 attr = nla_nest_start_noflag(skb, 3199 MACSEC_SA_ATTR_STATS); 3200 if (!attr) { 3201 nla_nest_cancel(skb, rxsa_list); 3202 nla_nest_cancel(skb, rxsc_nest); 3203 nla_nest_cancel(skb, rxsc_list); 3204 goto nla_put_failure; 3205 } 3206 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats)); 3207 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats); 3208 if (copy_rx_sa_stats(skb, &rx_sa_stats)) { 3209 nla_nest_cancel(skb, attr); 3210 nla_nest_cancel(skb, rxsa_list); 3211 nla_nest_cancel(skb, rxsc_nest); 3212 nla_nest_cancel(skb, rxsc_list); 3213 goto nla_put_failure; 3214 } 3215 nla_nest_end(skb, attr); 3216 3217 if (secy->xpn) { 3218 pn = rx_sa->next_pn; 3219 pn_len = MACSEC_XPN_PN_LEN; 3220 } else { 3221 pn = rx_sa->next_pn_halves.lower; 3222 pn_len = MACSEC_DEFAULT_PN_LEN; 3223 } 3224 3225 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3226 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3227 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 3228 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) || 3229 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 3230 nla_nest_cancel(skb, rxsa_nest); 3231 nla_nest_cancel(skb, rxsc_nest); 3232 nla_nest_cancel(skb, rxsc_list); 3233 goto nla_put_failure; 3234 } 3235 nla_nest_end(skb, rxsa_nest); 3236 } 3237 3238 nla_nest_end(skb, rxsa_list); 3239 nla_nest_end(skb, rxsc_nest); 3240 } 3241 3242 nla_nest_end(skb, rxsc_list); 3243 3244 genlmsg_end(skb, hdr); 3245 3246 return 0; 3247 3248 nla_put_failure: 3249 genlmsg_cancel(skb, hdr); 3250 return -EMSGSIZE; 3251 } 3252 3253 static int macsec_generation = 1; /* protected by RTNL */ 3254 3255 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 3256 { 3257 struct net *net = sock_net(skb->sk); 3258 struct net_device *dev; 3259 int dev_idx, d; 3260 3261 dev_idx = cb->args[0]; 3262 3263 d = 0; 3264 rtnl_lock(); 3265 3266 cb->seq = macsec_generation; 3267 3268 for_each_netdev(net, dev) { 3269 struct macsec_secy *secy; 3270 3271 if (d < dev_idx) 3272 goto next; 3273 3274 if (!netif_is_macsec(dev)) 3275 goto next; 3276 3277 secy = &macsec_priv(dev)->secy; 3278 if (dump_secy(secy, dev, skb, cb) < 0) 3279 goto done; 3280 next: 3281 d++; 3282 } 3283 3284 done: 3285 rtnl_unlock(); 3286 cb->args[0] = d; 3287 return skb->len; 3288 } 3289 3290 static const struct genl_small_ops macsec_genl_ops[] = { 3291 { 3292 .cmd = MACSEC_CMD_GET_TXSC, 3293 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3294 .dumpit = macsec_dump_txsc, 3295 }, 3296 { 3297 .cmd = MACSEC_CMD_ADD_RXSC, 3298 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3299 .doit = macsec_add_rxsc, 3300 .flags = GENL_ADMIN_PERM, 3301 }, 3302 { 3303 .cmd = MACSEC_CMD_DEL_RXSC, 3304 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3305 .doit = macsec_del_rxsc, 3306 .flags = GENL_ADMIN_PERM, 3307 }, 3308 { 3309 .cmd = MACSEC_CMD_UPD_RXSC, 3310 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3311 .doit = macsec_upd_rxsc, 3312 .flags = GENL_ADMIN_PERM, 3313 }, 3314 { 3315 .cmd = MACSEC_CMD_ADD_TXSA, 3316 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3317 .doit = macsec_add_txsa, 3318 .flags = GENL_ADMIN_PERM, 3319 }, 3320 { 3321 .cmd = MACSEC_CMD_DEL_TXSA, 3322 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3323 .doit = macsec_del_txsa, 3324 .flags = GENL_ADMIN_PERM, 3325 }, 3326 { 3327 .cmd = MACSEC_CMD_UPD_TXSA, 3328 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3329 .doit = macsec_upd_txsa, 3330 .flags = GENL_ADMIN_PERM, 3331 }, 3332 { 3333 .cmd = MACSEC_CMD_ADD_RXSA, 3334 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3335 .doit = macsec_add_rxsa, 3336 .flags = GENL_ADMIN_PERM, 3337 }, 3338 { 3339 .cmd = MACSEC_CMD_DEL_RXSA, 3340 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3341 .doit = macsec_del_rxsa, 3342 .flags = GENL_ADMIN_PERM, 3343 }, 3344 { 3345 .cmd = MACSEC_CMD_UPD_RXSA, 3346 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3347 .doit = macsec_upd_rxsa, 3348 .flags = GENL_ADMIN_PERM, 3349 }, 3350 { 3351 .cmd = MACSEC_CMD_UPD_OFFLOAD, 3352 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3353 .doit = macsec_upd_offload, 3354 .flags = GENL_ADMIN_PERM, 3355 }, 3356 }; 3357 3358 static struct genl_family macsec_fam __ro_after_init = { 3359 .name = MACSEC_GENL_NAME, 3360 .hdrsize = 0, 3361 .version = MACSEC_GENL_VERSION, 3362 .maxattr = MACSEC_ATTR_MAX, 3363 .policy = macsec_genl_policy, 3364 .netnsok = true, 3365 .module = THIS_MODULE, 3366 .small_ops = macsec_genl_ops, 3367 .n_small_ops = ARRAY_SIZE(macsec_genl_ops), 3368 }; 3369 3370 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 3371 struct net_device *dev) 3372 { 3373 struct macsec_dev *macsec = netdev_priv(dev); 3374 struct macsec_secy *secy = &macsec->secy; 3375 struct pcpu_secy_stats *secy_stats; 3376 int ret, len; 3377 3378 if (macsec_is_offloaded(netdev_priv(dev))) { 3379 skb->dev = macsec->real_dev; 3380 return dev_queue_xmit(skb); 3381 } 3382 3383 /* 10.5 */ 3384 if (!secy->protect_frames) { 3385 secy_stats = this_cpu_ptr(macsec->stats); 3386 u64_stats_update_begin(&secy_stats->syncp); 3387 secy_stats->stats.OutPktsUntagged++; 3388 u64_stats_update_end(&secy_stats->syncp); 3389 skb->dev = macsec->real_dev; 3390 len = skb->len; 3391 ret = dev_queue_xmit(skb); 3392 count_tx(dev, ret, len); 3393 return ret; 3394 } 3395 3396 if (!secy->operational) { 3397 kfree_skb(skb); 3398 dev->stats.tx_dropped++; 3399 return NETDEV_TX_OK; 3400 } 3401 3402 skb = macsec_encrypt(skb, dev); 3403 if (IS_ERR(skb)) { 3404 if (PTR_ERR(skb) != -EINPROGRESS) 3405 dev->stats.tx_dropped++; 3406 return NETDEV_TX_OK; 3407 } 3408 3409 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 3410 3411 macsec_encrypt_finish(skb, dev); 3412 len = skb->len; 3413 ret = dev_queue_xmit(skb); 3414 count_tx(dev, ret, len); 3415 return ret; 3416 } 3417 3418 #define SW_MACSEC_FEATURES \ 3419 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 3420 3421 /* If h/w offloading is enabled, use real device features save for 3422 * VLAN_FEATURES - they require additional ops 3423 * HW_MACSEC - no reason to report it 3424 */ 3425 #define REAL_DEV_FEATURES(dev) \ 3426 ((dev)->features & ~(NETIF_F_VLAN_FEATURES | NETIF_F_HW_MACSEC)) 3427 3428 static int macsec_dev_init(struct net_device *dev) 3429 { 3430 struct macsec_dev *macsec = macsec_priv(dev); 3431 struct net_device *real_dev = macsec->real_dev; 3432 int err; 3433 3434 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 3435 if (!dev->tstats) 3436 return -ENOMEM; 3437 3438 err = gro_cells_init(&macsec->gro_cells, dev); 3439 if (err) { 3440 free_percpu(dev->tstats); 3441 return err; 3442 } 3443 3444 if (macsec_is_offloaded(macsec)) { 3445 dev->features = REAL_DEV_FEATURES(real_dev); 3446 } else { 3447 dev->features = real_dev->features & SW_MACSEC_FEATURES; 3448 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 3449 } 3450 3451 dev->needed_headroom = real_dev->needed_headroom + 3452 MACSEC_NEEDED_HEADROOM; 3453 dev->needed_tailroom = real_dev->needed_tailroom + 3454 MACSEC_NEEDED_TAILROOM; 3455 3456 if (is_zero_ether_addr(dev->dev_addr)) 3457 eth_hw_addr_inherit(dev, real_dev); 3458 if (is_zero_ether_addr(dev->broadcast)) 3459 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 3460 3461 return 0; 3462 } 3463 3464 static void macsec_dev_uninit(struct net_device *dev) 3465 { 3466 struct macsec_dev *macsec = macsec_priv(dev); 3467 3468 gro_cells_destroy(&macsec->gro_cells); 3469 free_percpu(dev->tstats); 3470 } 3471 3472 static netdev_features_t macsec_fix_features(struct net_device *dev, 3473 netdev_features_t features) 3474 { 3475 struct macsec_dev *macsec = macsec_priv(dev); 3476 struct net_device *real_dev = macsec->real_dev; 3477 3478 if (macsec_is_offloaded(macsec)) 3479 return REAL_DEV_FEATURES(real_dev); 3480 3481 features &= (real_dev->features & SW_MACSEC_FEATURES) | 3482 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 3483 features |= NETIF_F_LLTX; 3484 3485 return features; 3486 } 3487 3488 static int macsec_dev_open(struct net_device *dev) 3489 { 3490 struct macsec_dev *macsec = macsec_priv(dev); 3491 struct net_device *real_dev = macsec->real_dev; 3492 int err; 3493 3494 err = dev_uc_add(real_dev, dev->dev_addr); 3495 if (err < 0) 3496 return err; 3497 3498 if (dev->flags & IFF_ALLMULTI) { 3499 err = dev_set_allmulti(real_dev, 1); 3500 if (err < 0) 3501 goto del_unicast; 3502 } 3503 3504 if (dev->flags & IFF_PROMISC) { 3505 err = dev_set_promiscuity(real_dev, 1); 3506 if (err < 0) 3507 goto clear_allmulti; 3508 } 3509 3510 /* If h/w offloading is available, propagate to the device */ 3511 if (macsec_is_offloaded(macsec)) { 3512 const struct macsec_ops *ops; 3513 struct macsec_context ctx; 3514 3515 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3516 if (!ops) { 3517 err = -EOPNOTSUPP; 3518 goto clear_allmulti; 3519 } 3520 3521 ctx.secy = &macsec->secy; 3522 err = macsec_offload(ops->mdo_dev_open, &ctx); 3523 if (err) 3524 goto clear_allmulti; 3525 } 3526 3527 if (netif_carrier_ok(real_dev)) 3528 netif_carrier_on(dev); 3529 3530 return 0; 3531 clear_allmulti: 3532 if (dev->flags & IFF_ALLMULTI) 3533 dev_set_allmulti(real_dev, -1); 3534 del_unicast: 3535 dev_uc_del(real_dev, dev->dev_addr); 3536 netif_carrier_off(dev); 3537 return err; 3538 } 3539 3540 static int macsec_dev_stop(struct net_device *dev) 3541 { 3542 struct macsec_dev *macsec = macsec_priv(dev); 3543 struct net_device *real_dev = macsec->real_dev; 3544 3545 netif_carrier_off(dev); 3546 3547 /* If h/w offloading is available, propagate to the device */ 3548 if (macsec_is_offloaded(macsec)) { 3549 const struct macsec_ops *ops; 3550 struct macsec_context ctx; 3551 3552 ops = macsec_get_ops(macsec, &ctx); 3553 if (ops) { 3554 ctx.secy = &macsec->secy; 3555 macsec_offload(ops->mdo_dev_stop, &ctx); 3556 } 3557 } 3558 3559 dev_mc_unsync(real_dev, dev); 3560 dev_uc_unsync(real_dev, dev); 3561 3562 if (dev->flags & IFF_ALLMULTI) 3563 dev_set_allmulti(real_dev, -1); 3564 3565 if (dev->flags & IFF_PROMISC) 3566 dev_set_promiscuity(real_dev, -1); 3567 3568 dev_uc_del(real_dev, dev->dev_addr); 3569 3570 return 0; 3571 } 3572 3573 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 3574 { 3575 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3576 3577 if (!(dev->flags & IFF_UP)) 3578 return; 3579 3580 if (change & IFF_ALLMULTI) 3581 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 3582 3583 if (change & IFF_PROMISC) 3584 dev_set_promiscuity(real_dev, 3585 dev->flags & IFF_PROMISC ? 1 : -1); 3586 } 3587 3588 static void macsec_dev_set_rx_mode(struct net_device *dev) 3589 { 3590 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3591 3592 dev_mc_sync(real_dev, dev); 3593 dev_uc_sync(real_dev, dev); 3594 } 3595 3596 static int macsec_set_mac_address(struct net_device *dev, void *p) 3597 { 3598 struct macsec_dev *macsec = macsec_priv(dev); 3599 struct net_device *real_dev = macsec->real_dev; 3600 struct sockaddr *addr = p; 3601 int err; 3602 3603 if (!is_valid_ether_addr(addr->sa_data)) 3604 return -EADDRNOTAVAIL; 3605 3606 if (!(dev->flags & IFF_UP)) 3607 goto out; 3608 3609 err = dev_uc_add(real_dev, addr->sa_data); 3610 if (err < 0) 3611 return err; 3612 3613 dev_uc_del(real_dev, dev->dev_addr); 3614 3615 out: 3616 ether_addr_copy(dev->dev_addr, addr->sa_data); 3617 macsec->secy.sci = dev_to_sci(dev, MACSEC_PORT_ES); 3618 3619 /* If h/w offloading is available, propagate to the device */ 3620 if (macsec_is_offloaded(macsec)) { 3621 const struct macsec_ops *ops; 3622 struct macsec_context ctx; 3623 3624 ops = macsec_get_ops(macsec, &ctx); 3625 if (ops) { 3626 ctx.secy = &macsec->secy; 3627 macsec_offload(ops->mdo_upd_secy, &ctx); 3628 } 3629 } 3630 3631 return 0; 3632 } 3633 3634 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 3635 { 3636 struct macsec_dev *macsec = macsec_priv(dev); 3637 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 3638 3639 if (macsec->real_dev->mtu - extra < new_mtu) 3640 return -ERANGE; 3641 3642 dev->mtu = new_mtu; 3643 3644 return 0; 3645 } 3646 3647 static void macsec_get_stats64(struct net_device *dev, 3648 struct rtnl_link_stats64 *s) 3649 { 3650 if (!dev->tstats) 3651 return; 3652 3653 dev_fetch_sw_netstats(s, dev->tstats); 3654 3655 s->rx_dropped = dev->stats.rx_dropped; 3656 s->tx_dropped = dev->stats.tx_dropped; 3657 } 3658 3659 static int macsec_get_iflink(const struct net_device *dev) 3660 { 3661 return macsec_priv(dev)->real_dev->ifindex; 3662 } 3663 3664 static const struct net_device_ops macsec_netdev_ops = { 3665 .ndo_init = macsec_dev_init, 3666 .ndo_uninit = macsec_dev_uninit, 3667 .ndo_open = macsec_dev_open, 3668 .ndo_stop = macsec_dev_stop, 3669 .ndo_fix_features = macsec_fix_features, 3670 .ndo_change_mtu = macsec_change_mtu, 3671 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 3672 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 3673 .ndo_set_mac_address = macsec_set_mac_address, 3674 .ndo_start_xmit = macsec_start_xmit, 3675 .ndo_get_stats64 = macsec_get_stats64, 3676 .ndo_get_iflink = macsec_get_iflink, 3677 }; 3678 3679 static const struct device_type macsec_type = { 3680 .name = "macsec", 3681 }; 3682 3683 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 3684 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 3685 [IFLA_MACSEC_PORT] = { .type = NLA_U16 }, 3686 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 3687 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 3688 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 3689 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 3690 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 3691 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 3692 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 3693 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 3694 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 3695 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 3696 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 3697 }; 3698 3699 static void macsec_free_netdev(struct net_device *dev) 3700 { 3701 struct macsec_dev *macsec = macsec_priv(dev); 3702 3703 free_percpu(macsec->stats); 3704 free_percpu(macsec->secy.tx_sc.stats); 3705 3706 } 3707 3708 static void macsec_setup(struct net_device *dev) 3709 { 3710 ether_setup(dev); 3711 dev->min_mtu = 0; 3712 dev->max_mtu = ETH_MAX_MTU; 3713 dev->priv_flags |= IFF_NO_QUEUE; 3714 dev->netdev_ops = &macsec_netdev_ops; 3715 dev->needs_free_netdev = true; 3716 dev->priv_destructor = macsec_free_netdev; 3717 SET_NETDEV_DEVTYPE(dev, &macsec_type); 3718 3719 eth_zero_addr(dev->broadcast); 3720 } 3721 3722 static int macsec_changelink_common(struct net_device *dev, 3723 struct nlattr *data[]) 3724 { 3725 struct macsec_secy *secy; 3726 struct macsec_tx_sc *tx_sc; 3727 3728 secy = &macsec_priv(dev)->secy; 3729 tx_sc = &secy->tx_sc; 3730 3731 if (data[IFLA_MACSEC_ENCODING_SA]) { 3732 struct macsec_tx_sa *tx_sa; 3733 3734 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3735 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 3736 3737 secy->operational = tx_sa && tx_sa->active; 3738 } 3739 3740 if (data[IFLA_MACSEC_WINDOW]) 3741 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3742 3743 if (data[IFLA_MACSEC_ENCRYPT]) 3744 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3745 3746 if (data[IFLA_MACSEC_PROTECT]) 3747 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3748 3749 if (data[IFLA_MACSEC_INC_SCI]) 3750 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3751 3752 if (data[IFLA_MACSEC_ES]) 3753 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3754 3755 if (data[IFLA_MACSEC_SCB]) 3756 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3757 3758 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3759 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3760 3761 if (data[IFLA_MACSEC_VALIDATION]) 3762 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3763 3764 if (data[IFLA_MACSEC_CIPHER_SUITE]) { 3765 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) { 3766 case MACSEC_CIPHER_ID_GCM_AES_128: 3767 case MACSEC_DEFAULT_CIPHER_ID: 3768 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3769 secy->xpn = false; 3770 break; 3771 case MACSEC_CIPHER_ID_GCM_AES_256: 3772 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3773 secy->xpn = false; 3774 break; 3775 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 3776 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3777 secy->xpn = true; 3778 break; 3779 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 3780 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3781 secy->xpn = true; 3782 break; 3783 default: 3784 return -EINVAL; 3785 } 3786 } 3787 3788 return 0; 3789 } 3790 3791 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3792 struct nlattr *data[], 3793 struct netlink_ext_ack *extack) 3794 { 3795 struct macsec_dev *macsec = macsec_priv(dev); 3796 struct macsec_tx_sc tx_sc; 3797 struct macsec_secy secy; 3798 int ret; 3799 3800 if (!data) 3801 return 0; 3802 3803 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3804 data[IFLA_MACSEC_ICV_LEN] || 3805 data[IFLA_MACSEC_SCI] || 3806 data[IFLA_MACSEC_PORT]) 3807 return -EINVAL; 3808 3809 /* Keep a copy of unmodified secy and tx_sc, in case the offload 3810 * propagation fails, to revert macsec_changelink_common. 3811 */ 3812 memcpy(&secy, &macsec->secy, sizeof(secy)); 3813 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc)); 3814 3815 ret = macsec_changelink_common(dev, data); 3816 if (ret) 3817 return ret; 3818 3819 /* If h/w offloading is available, propagate to the device */ 3820 if (macsec_is_offloaded(macsec)) { 3821 const struct macsec_ops *ops; 3822 struct macsec_context ctx; 3823 int ret; 3824 3825 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3826 if (!ops) { 3827 ret = -EOPNOTSUPP; 3828 goto cleanup; 3829 } 3830 3831 ctx.secy = &macsec->secy; 3832 ret = macsec_offload(ops->mdo_upd_secy, &ctx); 3833 if (ret) 3834 goto cleanup; 3835 } 3836 3837 return 0; 3838 3839 cleanup: 3840 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc)); 3841 memcpy(&macsec->secy, &secy, sizeof(secy)); 3842 3843 return ret; 3844 } 3845 3846 static void macsec_del_dev(struct macsec_dev *macsec) 3847 { 3848 int i; 3849 3850 while (macsec->secy.rx_sc) { 3851 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 3852 3853 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 3854 free_rx_sc(rx_sc); 3855 } 3856 3857 for (i = 0; i < MACSEC_NUM_AN; i++) { 3858 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 3859 3860 if (sa) { 3861 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 3862 clear_tx_sa(sa); 3863 } 3864 } 3865 } 3866 3867 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 3868 { 3869 struct macsec_dev *macsec = macsec_priv(dev); 3870 struct net_device *real_dev = macsec->real_dev; 3871 3872 unregister_netdevice_queue(dev, head); 3873 list_del_rcu(&macsec->secys); 3874 macsec_del_dev(macsec); 3875 netdev_upper_dev_unlink(real_dev, dev); 3876 3877 macsec_generation++; 3878 } 3879 3880 static void macsec_dellink(struct net_device *dev, struct list_head *head) 3881 { 3882 struct macsec_dev *macsec = macsec_priv(dev); 3883 struct net_device *real_dev = macsec->real_dev; 3884 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3885 3886 /* If h/w offloading is available, propagate to the device */ 3887 if (macsec_is_offloaded(macsec)) { 3888 const struct macsec_ops *ops; 3889 struct macsec_context ctx; 3890 3891 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3892 if (ops) { 3893 ctx.secy = &macsec->secy; 3894 macsec_offload(ops->mdo_del_secy, &ctx); 3895 } 3896 } 3897 3898 macsec_common_dellink(dev, head); 3899 3900 if (list_empty(&rxd->secys)) { 3901 netdev_rx_handler_unregister(real_dev); 3902 kfree(rxd); 3903 } 3904 } 3905 3906 static int register_macsec_dev(struct net_device *real_dev, 3907 struct net_device *dev) 3908 { 3909 struct macsec_dev *macsec = macsec_priv(dev); 3910 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3911 3912 if (!rxd) { 3913 int err; 3914 3915 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 3916 if (!rxd) 3917 return -ENOMEM; 3918 3919 INIT_LIST_HEAD(&rxd->secys); 3920 3921 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 3922 rxd); 3923 if (err < 0) { 3924 kfree(rxd); 3925 return err; 3926 } 3927 } 3928 3929 list_add_tail_rcu(&macsec->secys, &rxd->secys); 3930 return 0; 3931 } 3932 3933 static bool sci_exists(struct net_device *dev, sci_t sci) 3934 { 3935 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 3936 struct macsec_dev *macsec; 3937 3938 list_for_each_entry(macsec, &rxd->secys, secys) { 3939 if (macsec->secy.sci == sci) 3940 return true; 3941 } 3942 3943 return false; 3944 } 3945 3946 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 3947 { 3948 struct macsec_dev *macsec = macsec_priv(dev); 3949 struct macsec_secy *secy = &macsec->secy; 3950 3951 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 3952 if (!macsec->stats) 3953 return -ENOMEM; 3954 3955 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 3956 if (!secy->tx_sc.stats) { 3957 free_percpu(macsec->stats); 3958 return -ENOMEM; 3959 } 3960 3961 if (sci == MACSEC_UNDEF_SCI) 3962 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3963 3964 secy->netdev = dev; 3965 secy->operational = true; 3966 secy->key_len = DEFAULT_SAK_LEN; 3967 secy->icv_len = icv_len; 3968 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 3969 secy->protect_frames = true; 3970 secy->replay_protect = false; 3971 secy->xpn = DEFAULT_XPN; 3972 3973 secy->sci = sci; 3974 secy->tx_sc.active = true; 3975 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 3976 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 3977 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 3978 secy->tx_sc.end_station = false; 3979 secy->tx_sc.scb = false; 3980 3981 return 0; 3982 } 3983 3984 static struct lock_class_key macsec_netdev_addr_lock_key; 3985 3986 static int macsec_newlink(struct net *net, struct net_device *dev, 3987 struct nlattr *tb[], struct nlattr *data[], 3988 struct netlink_ext_ack *extack) 3989 { 3990 struct macsec_dev *macsec = macsec_priv(dev); 3991 rx_handler_func_t *rx_handler; 3992 u8 icv_len = DEFAULT_ICV_LEN; 3993 struct net_device *real_dev; 3994 int err, mtu; 3995 sci_t sci; 3996 3997 if (!tb[IFLA_LINK]) 3998 return -EINVAL; 3999 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 4000 if (!real_dev) 4001 return -ENODEV; 4002 if (real_dev->type != ARPHRD_ETHER) 4003 return -EINVAL; 4004 4005 dev->priv_flags |= IFF_MACSEC; 4006 4007 macsec->real_dev = real_dev; 4008 4009 if (data && data[IFLA_MACSEC_OFFLOAD]) 4010 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]); 4011 else 4012 /* MACsec offloading is off by default */ 4013 macsec->offload = MACSEC_OFFLOAD_OFF; 4014 4015 /* Check if the offloading mode is supported by the underlying layers */ 4016 if (macsec->offload != MACSEC_OFFLOAD_OFF && 4017 !macsec_check_offload(macsec->offload, macsec)) 4018 return -EOPNOTSUPP; 4019 4020 if (data && data[IFLA_MACSEC_ICV_LEN]) 4021 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4022 mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 4023 if (mtu < 0) 4024 dev->mtu = 0; 4025 else 4026 dev->mtu = mtu; 4027 4028 rx_handler = rtnl_dereference(real_dev->rx_handler); 4029 if (rx_handler && rx_handler != macsec_handle_frame) 4030 return -EBUSY; 4031 4032 err = register_netdevice(dev); 4033 if (err < 0) 4034 return err; 4035 4036 netdev_lockdep_set_classes(dev); 4037 lockdep_set_class(&dev->addr_list_lock, 4038 &macsec_netdev_addr_lock_key); 4039 4040 err = netdev_upper_dev_link(real_dev, dev, extack); 4041 if (err < 0) 4042 goto unregister; 4043 4044 /* need to be already registered so that ->init has run and 4045 * the MAC addr is set 4046 */ 4047 if (data && data[IFLA_MACSEC_SCI]) 4048 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 4049 else if (data && data[IFLA_MACSEC_PORT]) 4050 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 4051 else 4052 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4053 4054 if (rx_handler && sci_exists(real_dev, sci)) { 4055 err = -EBUSY; 4056 goto unlink; 4057 } 4058 4059 err = macsec_add_dev(dev, sci, icv_len); 4060 if (err) 4061 goto unlink; 4062 4063 if (data) { 4064 err = macsec_changelink_common(dev, data); 4065 if (err) 4066 goto del_dev; 4067 } 4068 4069 /* If h/w offloading is available, propagate to the device */ 4070 if (macsec_is_offloaded(macsec)) { 4071 const struct macsec_ops *ops; 4072 struct macsec_context ctx; 4073 4074 ops = macsec_get_ops(macsec, &ctx); 4075 if (ops) { 4076 ctx.secy = &macsec->secy; 4077 err = macsec_offload(ops->mdo_add_secy, &ctx); 4078 if (err) 4079 goto del_dev; 4080 } 4081 } 4082 4083 err = register_macsec_dev(real_dev, dev); 4084 if (err < 0) 4085 goto del_dev; 4086 4087 netif_stacked_transfer_operstate(real_dev, dev); 4088 linkwatch_fire_event(dev); 4089 4090 macsec_generation++; 4091 4092 return 0; 4093 4094 del_dev: 4095 macsec_del_dev(macsec); 4096 unlink: 4097 netdev_upper_dev_unlink(real_dev, dev); 4098 unregister: 4099 unregister_netdevice(dev); 4100 return err; 4101 } 4102 4103 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], 4104 struct netlink_ext_ack *extack) 4105 { 4106 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 4107 u8 icv_len = DEFAULT_ICV_LEN; 4108 int flag; 4109 bool es, scb, sci; 4110 4111 if (!data) 4112 return 0; 4113 4114 if (data[IFLA_MACSEC_CIPHER_SUITE]) 4115 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 4116 4117 if (data[IFLA_MACSEC_ICV_LEN]) { 4118 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4119 if (icv_len != DEFAULT_ICV_LEN) { 4120 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 4121 struct crypto_aead *dummy_tfm; 4122 4123 dummy_tfm = macsec_alloc_tfm(dummy_key, 4124 DEFAULT_SAK_LEN, 4125 icv_len); 4126 if (IS_ERR(dummy_tfm)) 4127 return PTR_ERR(dummy_tfm); 4128 crypto_free_aead(dummy_tfm); 4129 } 4130 } 4131 4132 switch (csid) { 4133 case MACSEC_CIPHER_ID_GCM_AES_128: 4134 case MACSEC_CIPHER_ID_GCM_AES_256: 4135 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 4136 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 4137 case MACSEC_DEFAULT_CIPHER_ID: 4138 if (icv_len < MACSEC_MIN_ICV_LEN || 4139 icv_len > MACSEC_STD_ICV_LEN) 4140 return -EINVAL; 4141 break; 4142 default: 4143 return -EINVAL; 4144 } 4145 4146 if (data[IFLA_MACSEC_ENCODING_SA]) { 4147 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 4148 return -EINVAL; 4149 } 4150 4151 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 4152 flag < IFLA_MACSEC_VALIDATION; 4153 flag++) { 4154 if (data[flag]) { 4155 if (nla_get_u8(data[flag]) > 1) 4156 return -EINVAL; 4157 } 4158 } 4159 4160 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 4161 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 4162 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 4163 4164 if ((sci && (scb || es)) || (scb && es)) 4165 return -EINVAL; 4166 4167 if (data[IFLA_MACSEC_VALIDATION] && 4168 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 4169 return -EINVAL; 4170 4171 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 4172 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 4173 !data[IFLA_MACSEC_WINDOW]) 4174 return -EINVAL; 4175 4176 return 0; 4177 } 4178 4179 static struct net *macsec_get_link_net(const struct net_device *dev) 4180 { 4181 return dev_net(macsec_priv(dev)->real_dev); 4182 } 4183 4184 static size_t macsec_get_size(const struct net_device *dev) 4185 { 4186 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ 4187 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ 4188 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ 4189 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ 4190 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ 4191 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ 4192 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ 4193 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ 4194 nla_total_size(1) + /* IFLA_MACSEC_ES */ 4195 nla_total_size(1) + /* IFLA_MACSEC_SCB */ 4196 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ 4197 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ 4198 0; 4199 } 4200 4201 static int macsec_fill_info(struct sk_buff *skb, 4202 const struct net_device *dev) 4203 { 4204 struct macsec_secy *secy = &macsec_priv(dev)->secy; 4205 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 4206 u64 csid; 4207 4208 switch (secy->key_len) { 4209 case MACSEC_GCM_AES_128_SAK_LEN: 4210 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 4211 break; 4212 case MACSEC_GCM_AES_256_SAK_LEN: 4213 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 4214 break; 4215 default: 4216 goto nla_put_failure; 4217 } 4218 4219 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 4220 IFLA_MACSEC_PAD) || 4221 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 4222 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 4223 csid, IFLA_MACSEC_PAD) || 4224 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 4225 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 4226 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 4227 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 4228 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 4229 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 4230 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 4231 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 4232 0) 4233 goto nla_put_failure; 4234 4235 if (secy->replay_protect) { 4236 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 4237 goto nla_put_failure; 4238 } 4239 4240 return 0; 4241 4242 nla_put_failure: 4243 return -EMSGSIZE; 4244 } 4245 4246 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 4247 .kind = "macsec", 4248 .priv_size = sizeof(struct macsec_dev), 4249 .maxtype = IFLA_MACSEC_MAX, 4250 .policy = macsec_rtnl_policy, 4251 .setup = macsec_setup, 4252 .validate = macsec_validate_attr, 4253 .newlink = macsec_newlink, 4254 .changelink = macsec_changelink, 4255 .dellink = macsec_dellink, 4256 .get_size = macsec_get_size, 4257 .fill_info = macsec_fill_info, 4258 .get_link_net = macsec_get_link_net, 4259 }; 4260 4261 static bool is_macsec_master(struct net_device *dev) 4262 { 4263 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 4264 } 4265 4266 static int macsec_notify(struct notifier_block *this, unsigned long event, 4267 void *ptr) 4268 { 4269 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 4270 LIST_HEAD(head); 4271 4272 if (!is_macsec_master(real_dev)) 4273 return NOTIFY_DONE; 4274 4275 switch (event) { 4276 case NETDEV_DOWN: 4277 case NETDEV_UP: 4278 case NETDEV_CHANGE: { 4279 struct macsec_dev *m, *n; 4280 struct macsec_rxh_data *rxd; 4281 4282 rxd = macsec_data_rtnl(real_dev); 4283 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4284 struct net_device *dev = m->secy.netdev; 4285 4286 netif_stacked_transfer_operstate(real_dev, dev); 4287 } 4288 break; 4289 } 4290 case NETDEV_UNREGISTER: { 4291 struct macsec_dev *m, *n; 4292 struct macsec_rxh_data *rxd; 4293 4294 rxd = macsec_data_rtnl(real_dev); 4295 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4296 macsec_common_dellink(m->secy.netdev, &head); 4297 } 4298 4299 netdev_rx_handler_unregister(real_dev); 4300 kfree(rxd); 4301 4302 unregister_netdevice_many(&head); 4303 break; 4304 } 4305 case NETDEV_CHANGEMTU: { 4306 struct macsec_dev *m; 4307 struct macsec_rxh_data *rxd; 4308 4309 rxd = macsec_data_rtnl(real_dev); 4310 list_for_each_entry(m, &rxd->secys, secys) { 4311 struct net_device *dev = m->secy.netdev; 4312 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 4313 macsec_extra_len(true)); 4314 4315 if (dev->mtu > mtu) 4316 dev_set_mtu(dev, mtu); 4317 } 4318 } 4319 } 4320 4321 return NOTIFY_OK; 4322 } 4323 4324 static struct notifier_block macsec_notifier = { 4325 .notifier_call = macsec_notify, 4326 }; 4327 4328 static int __init macsec_init(void) 4329 { 4330 int err; 4331 4332 pr_info("MACsec IEEE 802.1AE\n"); 4333 err = register_netdevice_notifier(&macsec_notifier); 4334 if (err) 4335 return err; 4336 4337 err = rtnl_link_register(&macsec_link_ops); 4338 if (err) 4339 goto notifier; 4340 4341 err = genl_register_family(&macsec_fam); 4342 if (err) 4343 goto rtnl; 4344 4345 return 0; 4346 4347 rtnl: 4348 rtnl_link_unregister(&macsec_link_ops); 4349 notifier: 4350 unregister_netdevice_notifier(&macsec_notifier); 4351 return err; 4352 } 4353 4354 static void __exit macsec_exit(void) 4355 { 4356 genl_unregister_family(&macsec_fam); 4357 rtnl_link_unregister(&macsec_link_ops); 4358 unregister_netdevice_notifier(&macsec_notifier); 4359 rcu_barrier(); 4360 } 4361 4362 module_init(macsec_init); 4363 module_exit(macsec_exit); 4364 4365 MODULE_ALIAS_RTNL_LINK("macsec"); 4366 MODULE_ALIAS_GENL_FAMILY("macsec"); 4367 4368 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 4369 MODULE_LICENSE("GPL v2"); 4370