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 sci_t sci; 1081 u32 hdr_pn; 1082 bool cbit; 1083 struct pcpu_rx_sc_stats *rxsc_stats; 1084 struct pcpu_secy_stats *secy_stats; 1085 bool pulled_sci; 1086 int ret; 1087 1088 if (skb_headroom(skb) < ETH_HLEN) 1089 goto drop_direct; 1090 1091 hdr = macsec_ethhdr(skb); 1092 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) 1093 return handle_not_macsec(skb); 1094 1095 skb = skb_unshare(skb, GFP_ATOMIC); 1096 *pskb = skb; 1097 if (!skb) 1098 return RX_HANDLER_CONSUMED; 1099 1100 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1101 if (!pulled_sci) { 1102 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1103 goto drop_direct; 1104 } 1105 1106 hdr = macsec_ethhdr(skb); 1107 1108 /* Frames with a SecTAG that has the TCI E bit set but the C 1109 * bit clear are discarded, as this reserved encoding is used 1110 * to identify frames with a SecTAG that are not to be 1111 * delivered to the Controlled Port. 1112 */ 1113 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1114 return RX_HANDLER_PASS; 1115 1116 /* now, pull the extra length */ 1117 if (hdr->tci_an & MACSEC_TCI_SC) { 1118 if (!pulled_sci) 1119 goto drop_direct; 1120 } 1121 1122 /* ethernet header is part of crypto processing */ 1123 skb_push(skb, ETH_HLEN); 1124 1125 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1126 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1127 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci); 1128 1129 rcu_read_lock(); 1130 rxd = macsec_data_rcu(skb->dev); 1131 1132 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1133 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1134 1135 sc = sc ? macsec_rxsc_get(sc) : NULL; 1136 1137 if (sc) { 1138 secy = &macsec->secy; 1139 rx_sc = sc; 1140 break; 1141 } 1142 } 1143 1144 if (!secy) 1145 goto nosci; 1146 1147 dev = secy->netdev; 1148 macsec = macsec_priv(dev); 1149 secy_stats = this_cpu_ptr(macsec->stats); 1150 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1151 1152 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) { 1153 u64_stats_update_begin(&secy_stats->syncp); 1154 secy_stats->stats.InPktsBadTag++; 1155 u64_stats_update_end(&secy_stats->syncp); 1156 goto drop_nosa; 1157 } 1158 1159 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1160 if (!rx_sa) { 1161 /* 10.6.1 if the SA is not in use */ 1162 1163 /* If validateFrames is Strict or the C bit in the 1164 * SecTAG is set, discard 1165 */ 1166 if (hdr->tci_an & MACSEC_TCI_C || 1167 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1168 u64_stats_update_begin(&rxsc_stats->syncp); 1169 rxsc_stats->stats.InPktsNotUsingSA++; 1170 u64_stats_update_end(&rxsc_stats->syncp); 1171 goto drop_nosa; 1172 } 1173 1174 /* not Strict, the frame (with the SecTAG and ICV 1175 * removed) is delivered to the Controlled Port. 1176 */ 1177 u64_stats_update_begin(&rxsc_stats->syncp); 1178 rxsc_stats->stats.InPktsUnusedSA++; 1179 u64_stats_update_end(&rxsc_stats->syncp); 1180 goto deliver; 1181 } 1182 1183 /* First, PN check to avoid decrypting obviously wrong packets */ 1184 hdr_pn = ntohl(hdr->packet_number); 1185 if (secy->replay_protect) { 1186 bool late; 1187 1188 spin_lock(&rx_sa->lock); 1189 late = rx_sa->next_pn_halves.lower >= secy->replay_window && 1190 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window); 1191 1192 if (secy->xpn) 1193 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn); 1194 spin_unlock(&rx_sa->lock); 1195 1196 if (late) { 1197 u64_stats_update_begin(&rxsc_stats->syncp); 1198 rxsc_stats->stats.InPktsLate++; 1199 u64_stats_update_end(&rxsc_stats->syncp); 1200 goto drop; 1201 } 1202 } 1203 1204 macsec_skb_cb(skb)->rx_sa = rx_sa; 1205 1206 /* Disabled && !changed text => skip validation */ 1207 if (hdr->tci_an & MACSEC_TCI_C || 1208 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1209 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1210 1211 if (IS_ERR(skb)) { 1212 /* the decrypt callback needs the reference */ 1213 if (PTR_ERR(skb) != -EINPROGRESS) { 1214 macsec_rxsa_put(rx_sa); 1215 macsec_rxsc_put(rx_sc); 1216 } 1217 rcu_read_unlock(); 1218 *pskb = NULL; 1219 return RX_HANDLER_CONSUMED; 1220 } 1221 1222 if (!macsec_post_decrypt(skb, secy, hdr_pn)) 1223 goto drop; 1224 1225 deliver: 1226 macsec_finalize_skb(skb, secy->icv_len, 1227 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1228 macsec_reset_skb(skb, secy->netdev); 1229 1230 if (rx_sa) 1231 macsec_rxsa_put(rx_sa); 1232 macsec_rxsc_put(rx_sc); 1233 1234 skb_orphan(skb); 1235 ret = gro_cells_receive(&macsec->gro_cells, skb); 1236 if (ret == NET_RX_SUCCESS) 1237 count_rx(dev, skb->len); 1238 else 1239 macsec->secy.netdev->stats.rx_dropped++; 1240 1241 rcu_read_unlock(); 1242 1243 *pskb = NULL; 1244 return RX_HANDLER_CONSUMED; 1245 1246 drop: 1247 macsec_rxsa_put(rx_sa); 1248 drop_nosa: 1249 macsec_rxsc_put(rx_sc); 1250 rcu_read_unlock(); 1251 drop_direct: 1252 kfree_skb(skb); 1253 *pskb = NULL; 1254 return RX_HANDLER_CONSUMED; 1255 1256 nosci: 1257 /* 10.6.1 if the SC is not found */ 1258 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1259 if (!cbit) 1260 macsec_finalize_skb(skb, DEFAULT_ICV_LEN, 1261 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1262 1263 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1264 struct sk_buff *nskb; 1265 1266 secy_stats = this_cpu_ptr(macsec->stats); 1267 1268 /* If validateFrames is Strict or the C bit in the 1269 * SecTAG is set, discard 1270 */ 1271 if (cbit || 1272 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1273 u64_stats_update_begin(&secy_stats->syncp); 1274 secy_stats->stats.InPktsNoSCI++; 1275 u64_stats_update_end(&secy_stats->syncp); 1276 continue; 1277 } 1278 1279 /* not strict, the frame (with the SecTAG and ICV 1280 * removed) is delivered to the Controlled Port. 1281 */ 1282 nskb = skb_clone(skb, GFP_ATOMIC); 1283 if (!nskb) 1284 break; 1285 1286 macsec_reset_skb(nskb, macsec->secy.netdev); 1287 1288 ret = netif_rx(nskb); 1289 if (ret == NET_RX_SUCCESS) { 1290 u64_stats_update_begin(&secy_stats->syncp); 1291 secy_stats->stats.InPktsUnknownSCI++; 1292 u64_stats_update_end(&secy_stats->syncp); 1293 } else { 1294 macsec->secy.netdev->stats.rx_dropped++; 1295 } 1296 } 1297 1298 rcu_read_unlock(); 1299 *pskb = skb; 1300 return RX_HANDLER_PASS; 1301 } 1302 1303 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1304 { 1305 struct crypto_aead *tfm; 1306 int ret; 1307 1308 /* Pick a sync gcm(aes) cipher to ensure order is preserved. */ 1309 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC); 1310 1311 if (IS_ERR(tfm)) 1312 return tfm; 1313 1314 ret = crypto_aead_setkey(tfm, key, key_len); 1315 if (ret < 0) 1316 goto fail; 1317 1318 ret = crypto_aead_setauthsize(tfm, icv_len); 1319 if (ret < 0) 1320 goto fail; 1321 1322 return tfm; 1323 fail: 1324 crypto_free_aead(tfm); 1325 return ERR_PTR(ret); 1326 } 1327 1328 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1329 int icv_len) 1330 { 1331 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1332 if (!rx_sa->stats) 1333 return -ENOMEM; 1334 1335 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1336 if (IS_ERR(rx_sa->key.tfm)) { 1337 free_percpu(rx_sa->stats); 1338 return PTR_ERR(rx_sa->key.tfm); 1339 } 1340 1341 rx_sa->ssci = MACSEC_UNDEF_SSCI; 1342 rx_sa->active = false; 1343 rx_sa->next_pn = 1; 1344 refcount_set(&rx_sa->refcnt, 1); 1345 spin_lock_init(&rx_sa->lock); 1346 1347 return 0; 1348 } 1349 1350 static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1351 { 1352 rx_sa->active = false; 1353 1354 macsec_rxsa_put(rx_sa); 1355 } 1356 1357 static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1358 { 1359 int i; 1360 1361 for (i = 0; i < MACSEC_NUM_AN; i++) { 1362 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1363 1364 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1365 if (sa) 1366 clear_rx_sa(sa); 1367 } 1368 1369 macsec_rxsc_put(rx_sc); 1370 } 1371 1372 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1373 { 1374 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1375 1376 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1377 rx_sc; 1378 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1379 if (rx_sc->sci == sci) { 1380 if (rx_sc->active) 1381 secy->n_rx_sc--; 1382 rcu_assign_pointer(*rx_scp, rx_sc->next); 1383 return rx_sc; 1384 } 1385 } 1386 1387 return NULL; 1388 } 1389 1390 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci) 1391 { 1392 struct macsec_rx_sc *rx_sc; 1393 struct macsec_dev *macsec; 1394 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1395 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1396 struct macsec_secy *secy; 1397 1398 list_for_each_entry(macsec, &rxd->secys, secys) { 1399 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1400 return ERR_PTR(-EEXIST); 1401 } 1402 1403 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL); 1404 if (!rx_sc) 1405 return ERR_PTR(-ENOMEM); 1406 1407 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1408 if (!rx_sc->stats) { 1409 kfree(rx_sc); 1410 return ERR_PTR(-ENOMEM); 1411 } 1412 1413 rx_sc->sci = sci; 1414 rx_sc->active = true; 1415 refcount_set(&rx_sc->refcnt, 1); 1416 1417 secy = &macsec_priv(dev)->secy; 1418 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1419 rcu_assign_pointer(secy->rx_sc, rx_sc); 1420 1421 if (rx_sc->active) 1422 secy->n_rx_sc++; 1423 1424 return rx_sc; 1425 } 1426 1427 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1428 int icv_len) 1429 { 1430 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1431 if (!tx_sa->stats) 1432 return -ENOMEM; 1433 1434 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1435 if (IS_ERR(tx_sa->key.tfm)) { 1436 free_percpu(tx_sa->stats); 1437 return PTR_ERR(tx_sa->key.tfm); 1438 } 1439 1440 tx_sa->ssci = MACSEC_UNDEF_SSCI; 1441 tx_sa->active = false; 1442 refcount_set(&tx_sa->refcnt, 1); 1443 spin_lock_init(&tx_sa->lock); 1444 1445 return 0; 1446 } 1447 1448 static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1449 { 1450 tx_sa->active = false; 1451 1452 macsec_txsa_put(tx_sa); 1453 } 1454 1455 static struct genl_family macsec_fam; 1456 1457 static struct net_device *get_dev_from_nl(struct net *net, 1458 struct nlattr **attrs) 1459 { 1460 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1461 struct net_device *dev; 1462 1463 dev = __dev_get_by_index(net, ifindex); 1464 if (!dev) 1465 return ERR_PTR(-ENODEV); 1466 1467 if (!netif_is_macsec(dev)) 1468 return ERR_PTR(-ENODEV); 1469 1470 return dev; 1471 } 1472 1473 static enum macsec_offload nla_get_offload(const struct nlattr *nla) 1474 { 1475 return (__force enum macsec_offload)nla_get_u8(nla); 1476 } 1477 1478 static sci_t nla_get_sci(const struct nlattr *nla) 1479 { 1480 return (__force sci_t)nla_get_u64(nla); 1481 } 1482 1483 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, 1484 int padattr) 1485 { 1486 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); 1487 } 1488 1489 static ssci_t nla_get_ssci(const struct nlattr *nla) 1490 { 1491 return (__force ssci_t)nla_get_u32(nla); 1492 } 1493 1494 static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value) 1495 { 1496 return nla_put_u32(skb, attrtype, (__force u64)value); 1497 } 1498 1499 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1500 struct nlattr **attrs, 1501 struct nlattr **tb_sa, 1502 struct net_device **devp, 1503 struct macsec_secy **secyp, 1504 struct macsec_tx_sc **scp, 1505 u8 *assoc_num) 1506 { 1507 struct net_device *dev; 1508 struct macsec_secy *secy; 1509 struct macsec_tx_sc *tx_sc; 1510 struct macsec_tx_sa *tx_sa; 1511 1512 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1513 return ERR_PTR(-EINVAL); 1514 1515 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1516 1517 dev = get_dev_from_nl(net, attrs); 1518 if (IS_ERR(dev)) 1519 return ERR_CAST(dev); 1520 1521 if (*assoc_num >= MACSEC_NUM_AN) 1522 return ERR_PTR(-EINVAL); 1523 1524 secy = &macsec_priv(dev)->secy; 1525 tx_sc = &secy->tx_sc; 1526 1527 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1528 if (!tx_sa) 1529 return ERR_PTR(-ENODEV); 1530 1531 *devp = dev; 1532 *scp = tx_sc; 1533 *secyp = secy; 1534 return tx_sa; 1535 } 1536 1537 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1538 struct nlattr **attrs, 1539 struct nlattr **tb_rxsc, 1540 struct net_device **devp, 1541 struct macsec_secy **secyp) 1542 { 1543 struct net_device *dev; 1544 struct macsec_secy *secy; 1545 struct macsec_rx_sc *rx_sc; 1546 sci_t sci; 1547 1548 dev = get_dev_from_nl(net, attrs); 1549 if (IS_ERR(dev)) 1550 return ERR_CAST(dev); 1551 1552 secy = &macsec_priv(dev)->secy; 1553 1554 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1555 return ERR_PTR(-EINVAL); 1556 1557 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1558 rx_sc = find_rx_sc_rtnl(secy, sci); 1559 if (!rx_sc) 1560 return ERR_PTR(-ENODEV); 1561 1562 *secyp = secy; 1563 *devp = dev; 1564 1565 return rx_sc; 1566 } 1567 1568 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1569 struct nlattr **attrs, 1570 struct nlattr **tb_rxsc, 1571 struct nlattr **tb_sa, 1572 struct net_device **devp, 1573 struct macsec_secy **secyp, 1574 struct macsec_rx_sc **scp, 1575 u8 *assoc_num) 1576 { 1577 struct macsec_rx_sc *rx_sc; 1578 struct macsec_rx_sa *rx_sa; 1579 1580 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1581 return ERR_PTR(-EINVAL); 1582 1583 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1584 if (*assoc_num >= MACSEC_NUM_AN) 1585 return ERR_PTR(-EINVAL); 1586 1587 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1588 if (IS_ERR(rx_sc)) 1589 return ERR_CAST(rx_sc); 1590 1591 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1592 if (!rx_sa) 1593 return ERR_PTR(-ENODEV); 1594 1595 *scp = rx_sc; 1596 return rx_sa; 1597 } 1598 1599 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1600 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1601 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1602 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1603 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED }, 1604 }; 1605 1606 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1607 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1608 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, 1609 }; 1610 1611 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1612 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, 1613 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, 1614 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4), 1615 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY, 1616 .len = MACSEC_KEYID_LEN, }, 1617 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1618 .len = MACSEC_MAX_KEY_LEN, }, 1619 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 }, 1620 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY, 1621 .len = MACSEC_SALT_LEN, }, 1622 }; 1623 1624 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = { 1625 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 }, 1626 }; 1627 1628 /* Offloads an operation to a device driver */ 1629 static int macsec_offload(int (* const func)(struct macsec_context *), 1630 struct macsec_context *ctx) 1631 { 1632 int ret; 1633 1634 if (unlikely(!func)) 1635 return 0; 1636 1637 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1638 mutex_lock(&ctx->phydev->lock); 1639 1640 /* Phase I: prepare. The drive should fail here if there are going to be 1641 * issues in the commit phase. 1642 */ 1643 ctx->prepare = true; 1644 ret = (*func)(ctx); 1645 if (ret) 1646 goto phy_unlock; 1647 1648 /* Phase II: commit. This step cannot fail. */ 1649 ctx->prepare = false; 1650 ret = (*func)(ctx); 1651 /* This should never happen: commit is not allowed to fail */ 1652 if (unlikely(ret)) 1653 WARN(1, "MACsec offloading commit failed (%d)\n", ret); 1654 1655 phy_unlock: 1656 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1657 mutex_unlock(&ctx->phydev->lock); 1658 1659 return ret; 1660 } 1661 1662 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1663 { 1664 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1665 return -EINVAL; 1666 1667 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL)) 1668 return -EINVAL; 1669 1670 return 0; 1671 } 1672 1673 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1674 { 1675 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1676 return -EINVAL; 1677 1678 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL)) 1679 return -EINVAL; 1680 1681 return 0; 1682 } 1683 1684 static bool validate_add_rxsa(struct nlattr **attrs) 1685 { 1686 if (!attrs[MACSEC_SA_ATTR_AN] || 1687 !attrs[MACSEC_SA_ATTR_KEY] || 1688 !attrs[MACSEC_SA_ATTR_KEYID]) 1689 return false; 1690 1691 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1692 return false; 1693 1694 if (attrs[MACSEC_SA_ATTR_PN] && 1695 *(u64 *)nla_data(attrs[MACSEC_SA_ATTR_PN]) == 0) 1696 return false; 1697 1698 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1699 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1700 return false; 1701 } 1702 1703 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1704 return false; 1705 1706 return true; 1707 } 1708 1709 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1710 { 1711 struct net_device *dev; 1712 struct nlattr **attrs = info->attrs; 1713 struct macsec_secy *secy; 1714 struct macsec_rx_sc *rx_sc; 1715 struct macsec_rx_sa *rx_sa; 1716 unsigned char assoc_num; 1717 int pn_len; 1718 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1719 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1720 int err; 1721 1722 if (!attrs[MACSEC_ATTR_IFINDEX]) 1723 return -EINVAL; 1724 1725 if (parse_sa_config(attrs, tb_sa)) 1726 return -EINVAL; 1727 1728 if (parse_rxsc_config(attrs, tb_rxsc)) 1729 return -EINVAL; 1730 1731 if (!validate_add_rxsa(tb_sa)) 1732 return -EINVAL; 1733 1734 rtnl_lock(); 1735 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1736 if (IS_ERR(rx_sc)) { 1737 rtnl_unlock(); 1738 return PTR_ERR(rx_sc); 1739 } 1740 1741 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1742 1743 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1744 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1745 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1746 rtnl_unlock(); 1747 return -EINVAL; 1748 } 1749 1750 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1751 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1752 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n", 1753 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1754 rtnl_unlock(); 1755 return -EINVAL; 1756 } 1757 1758 if (secy->xpn) { 1759 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 1760 rtnl_unlock(); 1761 return -EINVAL; 1762 } 1763 1764 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 1765 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n", 1766 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 1767 MACSEC_SA_ATTR_SALT); 1768 rtnl_unlock(); 1769 return -EINVAL; 1770 } 1771 } 1772 1773 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1774 if (rx_sa) { 1775 rtnl_unlock(); 1776 return -EBUSY; 1777 } 1778 1779 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1780 if (!rx_sa) { 1781 rtnl_unlock(); 1782 return -ENOMEM; 1783 } 1784 1785 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1786 secy->key_len, secy->icv_len); 1787 if (err < 0) { 1788 kfree(rx_sa); 1789 rtnl_unlock(); 1790 return err; 1791 } 1792 1793 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1794 spin_lock_bh(&rx_sa->lock); 1795 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 1796 spin_unlock_bh(&rx_sa->lock); 1797 } 1798 1799 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1800 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1801 1802 rx_sa->sc = rx_sc; 1803 1804 /* If h/w offloading is available, propagate to the device */ 1805 if (macsec_is_offloaded(netdev_priv(dev))) { 1806 const struct macsec_ops *ops; 1807 struct macsec_context ctx; 1808 1809 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1810 if (!ops) { 1811 err = -EOPNOTSUPP; 1812 goto cleanup; 1813 } 1814 1815 ctx.sa.assoc_num = assoc_num; 1816 ctx.sa.rx_sa = rx_sa; 1817 ctx.secy = secy; 1818 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1819 MACSEC_KEYID_LEN); 1820 1821 err = macsec_offload(ops->mdo_add_rxsa, &ctx); 1822 if (err) 1823 goto cleanup; 1824 } 1825 1826 if (secy->xpn) { 1827 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 1828 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 1829 MACSEC_SALT_LEN); 1830 } 1831 1832 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1833 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1834 1835 rtnl_unlock(); 1836 1837 return 0; 1838 1839 cleanup: 1840 kfree(rx_sa); 1841 rtnl_unlock(); 1842 return err; 1843 } 1844 1845 static bool validate_add_rxsc(struct nlattr **attrs) 1846 { 1847 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1848 return false; 1849 1850 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1851 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1852 return false; 1853 } 1854 1855 return true; 1856 } 1857 1858 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1859 { 1860 struct net_device *dev; 1861 sci_t sci = MACSEC_UNDEF_SCI; 1862 struct nlattr **attrs = info->attrs; 1863 struct macsec_rx_sc *rx_sc; 1864 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1865 struct macsec_secy *secy; 1866 bool was_active; 1867 int ret; 1868 1869 if (!attrs[MACSEC_ATTR_IFINDEX]) 1870 return -EINVAL; 1871 1872 if (parse_rxsc_config(attrs, tb_rxsc)) 1873 return -EINVAL; 1874 1875 if (!validate_add_rxsc(tb_rxsc)) 1876 return -EINVAL; 1877 1878 rtnl_lock(); 1879 dev = get_dev_from_nl(genl_info_net(info), attrs); 1880 if (IS_ERR(dev)) { 1881 rtnl_unlock(); 1882 return PTR_ERR(dev); 1883 } 1884 1885 secy = &macsec_priv(dev)->secy; 1886 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1887 1888 rx_sc = create_rx_sc(dev, sci); 1889 if (IS_ERR(rx_sc)) { 1890 rtnl_unlock(); 1891 return PTR_ERR(rx_sc); 1892 } 1893 1894 was_active = rx_sc->active; 1895 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1896 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1897 1898 if (macsec_is_offloaded(netdev_priv(dev))) { 1899 const struct macsec_ops *ops; 1900 struct macsec_context ctx; 1901 1902 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1903 if (!ops) { 1904 ret = -EOPNOTSUPP; 1905 goto cleanup; 1906 } 1907 1908 ctx.rx_sc = rx_sc; 1909 ctx.secy = secy; 1910 1911 ret = macsec_offload(ops->mdo_add_rxsc, &ctx); 1912 if (ret) 1913 goto cleanup; 1914 } 1915 1916 rtnl_unlock(); 1917 1918 return 0; 1919 1920 cleanup: 1921 rx_sc->active = was_active; 1922 rtnl_unlock(); 1923 return ret; 1924 } 1925 1926 static bool validate_add_txsa(struct nlattr **attrs) 1927 { 1928 if (!attrs[MACSEC_SA_ATTR_AN] || 1929 !attrs[MACSEC_SA_ATTR_PN] || 1930 !attrs[MACSEC_SA_ATTR_KEY] || 1931 !attrs[MACSEC_SA_ATTR_KEYID]) 1932 return false; 1933 1934 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1935 return false; 1936 1937 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1938 return false; 1939 1940 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1941 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1942 return false; 1943 } 1944 1945 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1946 return false; 1947 1948 return true; 1949 } 1950 1951 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1952 { 1953 struct net_device *dev; 1954 struct nlattr **attrs = info->attrs; 1955 struct macsec_secy *secy; 1956 struct macsec_tx_sc *tx_sc; 1957 struct macsec_tx_sa *tx_sa; 1958 unsigned char assoc_num; 1959 int pn_len; 1960 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1961 bool was_operational; 1962 int err; 1963 1964 if (!attrs[MACSEC_ATTR_IFINDEX]) 1965 return -EINVAL; 1966 1967 if (parse_sa_config(attrs, tb_sa)) 1968 return -EINVAL; 1969 1970 if (!validate_add_txsa(tb_sa)) 1971 return -EINVAL; 1972 1973 rtnl_lock(); 1974 dev = get_dev_from_nl(genl_info_net(info), attrs); 1975 if (IS_ERR(dev)) { 1976 rtnl_unlock(); 1977 return PTR_ERR(dev); 1978 } 1979 1980 secy = &macsec_priv(dev)->secy; 1981 tx_sc = &secy->tx_sc; 1982 1983 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1984 1985 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1986 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 1987 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1988 rtnl_unlock(); 1989 return -EINVAL; 1990 } 1991 1992 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1993 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1994 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n", 1995 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1996 rtnl_unlock(); 1997 return -EINVAL; 1998 } 1999 2000 if (secy->xpn) { 2001 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 2002 rtnl_unlock(); 2003 return -EINVAL; 2004 } 2005 2006 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 2007 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n", 2008 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 2009 MACSEC_SA_ATTR_SALT); 2010 rtnl_unlock(); 2011 return -EINVAL; 2012 } 2013 } 2014 2015 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 2016 if (tx_sa) { 2017 rtnl_unlock(); 2018 return -EBUSY; 2019 } 2020 2021 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 2022 if (!tx_sa) { 2023 rtnl_unlock(); 2024 return -ENOMEM; 2025 } 2026 2027 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2028 secy->key_len, secy->icv_len); 2029 if (err < 0) { 2030 kfree(tx_sa); 2031 rtnl_unlock(); 2032 return err; 2033 } 2034 2035 spin_lock_bh(&tx_sa->lock); 2036 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2037 spin_unlock_bh(&tx_sa->lock); 2038 2039 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2040 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2041 2042 was_operational = secy->operational; 2043 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 2044 secy->operational = true; 2045 2046 /* If h/w offloading is available, propagate to the device */ 2047 if (macsec_is_offloaded(netdev_priv(dev))) { 2048 const struct macsec_ops *ops; 2049 struct macsec_context ctx; 2050 2051 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2052 if (!ops) { 2053 err = -EOPNOTSUPP; 2054 goto cleanup; 2055 } 2056 2057 ctx.sa.assoc_num = assoc_num; 2058 ctx.sa.tx_sa = tx_sa; 2059 ctx.secy = secy; 2060 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2061 MACSEC_KEYID_LEN); 2062 2063 err = macsec_offload(ops->mdo_add_txsa, &ctx); 2064 if (err) 2065 goto cleanup; 2066 } 2067 2068 if (secy->xpn) { 2069 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 2070 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 2071 MACSEC_SALT_LEN); 2072 } 2073 2074 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 2075 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 2076 2077 rtnl_unlock(); 2078 2079 return 0; 2080 2081 cleanup: 2082 secy->operational = was_operational; 2083 kfree(tx_sa); 2084 rtnl_unlock(); 2085 return err; 2086 } 2087 2088 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 2089 { 2090 struct nlattr **attrs = info->attrs; 2091 struct net_device *dev; 2092 struct macsec_secy *secy; 2093 struct macsec_rx_sc *rx_sc; 2094 struct macsec_rx_sa *rx_sa; 2095 u8 assoc_num; 2096 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2097 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2098 int ret; 2099 2100 if (!attrs[MACSEC_ATTR_IFINDEX]) 2101 return -EINVAL; 2102 2103 if (parse_sa_config(attrs, tb_sa)) 2104 return -EINVAL; 2105 2106 if (parse_rxsc_config(attrs, tb_rxsc)) 2107 return -EINVAL; 2108 2109 rtnl_lock(); 2110 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2111 &dev, &secy, &rx_sc, &assoc_num); 2112 if (IS_ERR(rx_sa)) { 2113 rtnl_unlock(); 2114 return PTR_ERR(rx_sa); 2115 } 2116 2117 if (rx_sa->active) { 2118 rtnl_unlock(); 2119 return -EBUSY; 2120 } 2121 2122 /* If h/w offloading is available, propagate to the device */ 2123 if (macsec_is_offloaded(netdev_priv(dev))) { 2124 const struct macsec_ops *ops; 2125 struct macsec_context ctx; 2126 2127 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2128 if (!ops) { 2129 ret = -EOPNOTSUPP; 2130 goto cleanup; 2131 } 2132 2133 ctx.sa.assoc_num = assoc_num; 2134 ctx.sa.rx_sa = rx_sa; 2135 ctx.secy = secy; 2136 2137 ret = macsec_offload(ops->mdo_del_rxsa, &ctx); 2138 if (ret) 2139 goto cleanup; 2140 } 2141 2142 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 2143 clear_rx_sa(rx_sa); 2144 2145 rtnl_unlock(); 2146 2147 return 0; 2148 2149 cleanup: 2150 rtnl_unlock(); 2151 return ret; 2152 } 2153 2154 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 2155 { 2156 struct nlattr **attrs = info->attrs; 2157 struct net_device *dev; 2158 struct macsec_secy *secy; 2159 struct macsec_rx_sc *rx_sc; 2160 sci_t sci; 2161 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2162 int ret; 2163 2164 if (!attrs[MACSEC_ATTR_IFINDEX]) 2165 return -EINVAL; 2166 2167 if (parse_rxsc_config(attrs, tb_rxsc)) 2168 return -EINVAL; 2169 2170 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 2171 return -EINVAL; 2172 2173 rtnl_lock(); 2174 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 2175 if (IS_ERR(dev)) { 2176 rtnl_unlock(); 2177 return PTR_ERR(dev); 2178 } 2179 2180 secy = &macsec_priv(dev)->secy; 2181 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 2182 2183 rx_sc = del_rx_sc(secy, sci); 2184 if (!rx_sc) { 2185 rtnl_unlock(); 2186 return -ENODEV; 2187 } 2188 2189 /* If h/w offloading is available, propagate to the device */ 2190 if (macsec_is_offloaded(netdev_priv(dev))) { 2191 const struct macsec_ops *ops; 2192 struct macsec_context ctx; 2193 2194 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2195 if (!ops) { 2196 ret = -EOPNOTSUPP; 2197 goto cleanup; 2198 } 2199 2200 ctx.rx_sc = rx_sc; 2201 ctx.secy = secy; 2202 ret = macsec_offload(ops->mdo_del_rxsc, &ctx); 2203 if (ret) 2204 goto cleanup; 2205 } 2206 2207 free_rx_sc(rx_sc); 2208 rtnl_unlock(); 2209 2210 return 0; 2211 2212 cleanup: 2213 rtnl_unlock(); 2214 return ret; 2215 } 2216 2217 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 2218 { 2219 struct nlattr **attrs = info->attrs; 2220 struct net_device *dev; 2221 struct macsec_secy *secy; 2222 struct macsec_tx_sc *tx_sc; 2223 struct macsec_tx_sa *tx_sa; 2224 u8 assoc_num; 2225 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2226 int ret; 2227 2228 if (!attrs[MACSEC_ATTR_IFINDEX]) 2229 return -EINVAL; 2230 2231 if (parse_sa_config(attrs, tb_sa)) 2232 return -EINVAL; 2233 2234 rtnl_lock(); 2235 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2236 &dev, &secy, &tx_sc, &assoc_num); 2237 if (IS_ERR(tx_sa)) { 2238 rtnl_unlock(); 2239 return PTR_ERR(tx_sa); 2240 } 2241 2242 if (tx_sa->active) { 2243 rtnl_unlock(); 2244 return -EBUSY; 2245 } 2246 2247 /* If h/w offloading is available, propagate to the device */ 2248 if (macsec_is_offloaded(netdev_priv(dev))) { 2249 const struct macsec_ops *ops; 2250 struct macsec_context ctx; 2251 2252 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2253 if (!ops) { 2254 ret = -EOPNOTSUPP; 2255 goto cleanup; 2256 } 2257 2258 ctx.sa.assoc_num = assoc_num; 2259 ctx.sa.tx_sa = tx_sa; 2260 ctx.secy = secy; 2261 2262 ret = macsec_offload(ops->mdo_del_txsa, &ctx); 2263 if (ret) 2264 goto cleanup; 2265 } 2266 2267 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 2268 clear_tx_sa(tx_sa); 2269 2270 rtnl_unlock(); 2271 2272 return 0; 2273 2274 cleanup: 2275 rtnl_unlock(); 2276 return ret; 2277 } 2278 2279 static bool validate_upd_sa(struct nlattr **attrs) 2280 { 2281 if (!attrs[MACSEC_SA_ATTR_AN] || 2282 attrs[MACSEC_SA_ATTR_KEY] || 2283 attrs[MACSEC_SA_ATTR_KEYID] || 2284 attrs[MACSEC_SA_ATTR_SSCI] || 2285 attrs[MACSEC_SA_ATTR_SALT]) 2286 return false; 2287 2288 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 2289 return false; 2290 2291 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 2292 return false; 2293 2294 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 2295 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 2296 return false; 2297 } 2298 2299 return true; 2300 } 2301 2302 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2303 { 2304 struct nlattr **attrs = info->attrs; 2305 struct net_device *dev; 2306 struct macsec_secy *secy; 2307 struct macsec_tx_sc *tx_sc; 2308 struct macsec_tx_sa *tx_sa; 2309 u8 assoc_num; 2310 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2311 bool was_operational, was_active; 2312 pn_t prev_pn; 2313 int ret = 0; 2314 2315 prev_pn.full64 = 0; 2316 2317 if (!attrs[MACSEC_ATTR_IFINDEX]) 2318 return -EINVAL; 2319 2320 if (parse_sa_config(attrs, tb_sa)) 2321 return -EINVAL; 2322 2323 if (!validate_upd_sa(tb_sa)) 2324 return -EINVAL; 2325 2326 rtnl_lock(); 2327 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2328 &dev, &secy, &tx_sc, &assoc_num); 2329 if (IS_ERR(tx_sa)) { 2330 rtnl_unlock(); 2331 return PTR_ERR(tx_sa); 2332 } 2333 2334 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2335 int pn_len; 2336 2337 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2338 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2339 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n", 2340 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2341 rtnl_unlock(); 2342 return -EINVAL; 2343 } 2344 2345 spin_lock_bh(&tx_sa->lock); 2346 prev_pn = tx_sa->next_pn_halves; 2347 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2348 spin_unlock_bh(&tx_sa->lock); 2349 } 2350 2351 was_active = tx_sa->active; 2352 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2353 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2354 2355 was_operational = secy->operational; 2356 if (assoc_num == tx_sc->encoding_sa) 2357 secy->operational = tx_sa->active; 2358 2359 /* If h/w offloading is available, propagate to the device */ 2360 if (macsec_is_offloaded(netdev_priv(dev))) { 2361 const struct macsec_ops *ops; 2362 struct macsec_context ctx; 2363 2364 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2365 if (!ops) { 2366 ret = -EOPNOTSUPP; 2367 goto cleanup; 2368 } 2369 2370 ctx.sa.assoc_num = assoc_num; 2371 ctx.sa.tx_sa = tx_sa; 2372 ctx.secy = secy; 2373 2374 ret = macsec_offload(ops->mdo_upd_txsa, &ctx); 2375 if (ret) 2376 goto cleanup; 2377 } 2378 2379 rtnl_unlock(); 2380 2381 return 0; 2382 2383 cleanup: 2384 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2385 spin_lock_bh(&tx_sa->lock); 2386 tx_sa->next_pn_halves = prev_pn; 2387 spin_unlock_bh(&tx_sa->lock); 2388 } 2389 tx_sa->active = was_active; 2390 secy->operational = was_operational; 2391 rtnl_unlock(); 2392 return ret; 2393 } 2394 2395 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2396 { 2397 struct nlattr **attrs = info->attrs; 2398 struct net_device *dev; 2399 struct macsec_secy *secy; 2400 struct macsec_rx_sc *rx_sc; 2401 struct macsec_rx_sa *rx_sa; 2402 u8 assoc_num; 2403 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2404 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2405 bool was_active; 2406 pn_t prev_pn; 2407 int ret = 0; 2408 2409 prev_pn.full64 = 0; 2410 2411 if (!attrs[MACSEC_ATTR_IFINDEX]) 2412 return -EINVAL; 2413 2414 if (parse_rxsc_config(attrs, tb_rxsc)) 2415 return -EINVAL; 2416 2417 if (parse_sa_config(attrs, tb_sa)) 2418 return -EINVAL; 2419 2420 if (!validate_upd_sa(tb_sa)) 2421 return -EINVAL; 2422 2423 rtnl_lock(); 2424 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2425 &dev, &secy, &rx_sc, &assoc_num); 2426 if (IS_ERR(rx_sa)) { 2427 rtnl_unlock(); 2428 return PTR_ERR(rx_sa); 2429 } 2430 2431 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2432 int pn_len; 2433 2434 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2435 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2436 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n", 2437 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2438 rtnl_unlock(); 2439 return -EINVAL; 2440 } 2441 2442 spin_lock_bh(&rx_sa->lock); 2443 prev_pn = rx_sa->next_pn_halves; 2444 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2445 spin_unlock_bh(&rx_sa->lock); 2446 } 2447 2448 was_active = rx_sa->active; 2449 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2450 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2451 2452 /* If h/w offloading is available, propagate to the device */ 2453 if (macsec_is_offloaded(netdev_priv(dev))) { 2454 const struct macsec_ops *ops; 2455 struct macsec_context ctx; 2456 2457 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2458 if (!ops) { 2459 ret = -EOPNOTSUPP; 2460 goto cleanup; 2461 } 2462 2463 ctx.sa.assoc_num = assoc_num; 2464 ctx.sa.rx_sa = rx_sa; 2465 ctx.secy = secy; 2466 2467 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx); 2468 if (ret) 2469 goto cleanup; 2470 } 2471 2472 rtnl_unlock(); 2473 return 0; 2474 2475 cleanup: 2476 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2477 spin_lock_bh(&rx_sa->lock); 2478 rx_sa->next_pn_halves = prev_pn; 2479 spin_unlock_bh(&rx_sa->lock); 2480 } 2481 rx_sa->active = was_active; 2482 rtnl_unlock(); 2483 return ret; 2484 } 2485 2486 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2487 { 2488 struct nlattr **attrs = info->attrs; 2489 struct net_device *dev; 2490 struct macsec_secy *secy; 2491 struct macsec_rx_sc *rx_sc; 2492 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2493 unsigned int prev_n_rx_sc; 2494 bool was_active; 2495 int ret; 2496 2497 if (!attrs[MACSEC_ATTR_IFINDEX]) 2498 return -EINVAL; 2499 2500 if (parse_rxsc_config(attrs, tb_rxsc)) 2501 return -EINVAL; 2502 2503 if (!validate_add_rxsc(tb_rxsc)) 2504 return -EINVAL; 2505 2506 rtnl_lock(); 2507 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2508 if (IS_ERR(rx_sc)) { 2509 rtnl_unlock(); 2510 return PTR_ERR(rx_sc); 2511 } 2512 2513 was_active = rx_sc->active; 2514 prev_n_rx_sc = secy->n_rx_sc; 2515 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2516 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2517 2518 if (rx_sc->active != new) 2519 secy->n_rx_sc += new ? 1 : -1; 2520 2521 rx_sc->active = new; 2522 } 2523 2524 /* If h/w offloading is available, propagate to the device */ 2525 if (macsec_is_offloaded(netdev_priv(dev))) { 2526 const struct macsec_ops *ops; 2527 struct macsec_context ctx; 2528 2529 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2530 if (!ops) { 2531 ret = -EOPNOTSUPP; 2532 goto cleanup; 2533 } 2534 2535 ctx.rx_sc = rx_sc; 2536 ctx.secy = secy; 2537 2538 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx); 2539 if (ret) 2540 goto cleanup; 2541 } 2542 2543 rtnl_unlock(); 2544 2545 return 0; 2546 2547 cleanup: 2548 secy->n_rx_sc = prev_n_rx_sc; 2549 rx_sc->active = was_active; 2550 rtnl_unlock(); 2551 return ret; 2552 } 2553 2554 static bool macsec_is_configured(struct macsec_dev *macsec) 2555 { 2556 struct macsec_secy *secy = &macsec->secy; 2557 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2558 int i; 2559 2560 if (secy->n_rx_sc > 0) 2561 return true; 2562 2563 for (i = 0; i < MACSEC_NUM_AN; i++) 2564 if (tx_sc->sa[i]) 2565 return true; 2566 2567 return false; 2568 } 2569 2570 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info) 2571 { 2572 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1]; 2573 enum macsec_offload offload, prev_offload; 2574 int (*func)(struct macsec_context *ctx); 2575 struct nlattr **attrs = info->attrs; 2576 struct net_device *dev; 2577 const struct macsec_ops *ops; 2578 struct macsec_context ctx; 2579 struct macsec_dev *macsec; 2580 int ret; 2581 2582 if (!attrs[MACSEC_ATTR_IFINDEX]) 2583 return -EINVAL; 2584 2585 if (!attrs[MACSEC_ATTR_OFFLOAD]) 2586 return -EINVAL; 2587 2588 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX, 2589 attrs[MACSEC_ATTR_OFFLOAD], 2590 macsec_genl_offload_policy, NULL)) 2591 return -EINVAL; 2592 2593 dev = get_dev_from_nl(genl_info_net(info), attrs); 2594 if (IS_ERR(dev)) 2595 return PTR_ERR(dev); 2596 macsec = macsec_priv(dev); 2597 2598 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) 2599 return -EINVAL; 2600 2601 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]); 2602 if (macsec->offload == offload) 2603 return 0; 2604 2605 /* Check if the offloading mode is supported by the underlying layers */ 2606 if (offload != MACSEC_OFFLOAD_OFF && 2607 !macsec_check_offload(offload, macsec)) 2608 return -EOPNOTSUPP; 2609 2610 /* Check if the net device is busy. */ 2611 if (netif_running(dev)) 2612 return -EBUSY; 2613 2614 rtnl_lock(); 2615 2616 prev_offload = macsec->offload; 2617 macsec->offload = offload; 2618 2619 /* Check if the device already has rules configured: we do not support 2620 * rules migration. 2621 */ 2622 if (macsec_is_configured(macsec)) { 2623 ret = -EBUSY; 2624 goto rollback; 2625 } 2626 2627 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload, 2628 macsec, &ctx); 2629 if (!ops) { 2630 ret = -EOPNOTSUPP; 2631 goto rollback; 2632 } 2633 2634 if (prev_offload == MACSEC_OFFLOAD_OFF) 2635 func = ops->mdo_add_secy; 2636 else 2637 func = ops->mdo_del_secy; 2638 2639 ctx.secy = &macsec->secy; 2640 ret = macsec_offload(func, &ctx); 2641 if (ret) 2642 goto rollback; 2643 2644 /* Force features update, since they are different for SW MACSec and 2645 * HW offloading cases. 2646 */ 2647 netdev_update_features(dev); 2648 2649 rtnl_unlock(); 2650 return 0; 2651 2652 rollback: 2653 macsec->offload = prev_offload; 2654 2655 rtnl_unlock(); 2656 return ret; 2657 } 2658 2659 static void get_tx_sa_stats(struct net_device *dev, int an, 2660 struct macsec_tx_sa *tx_sa, 2661 struct macsec_tx_sa_stats *sum) 2662 { 2663 struct macsec_dev *macsec = macsec_priv(dev); 2664 int cpu; 2665 2666 /* If h/w offloading is available, propagate to the device */ 2667 if (macsec_is_offloaded(macsec)) { 2668 const struct macsec_ops *ops; 2669 struct macsec_context ctx; 2670 2671 ops = macsec_get_ops(macsec, &ctx); 2672 if (ops) { 2673 ctx.sa.assoc_num = an; 2674 ctx.sa.tx_sa = tx_sa; 2675 ctx.stats.tx_sa_stats = sum; 2676 ctx.secy = &macsec_priv(dev)->secy; 2677 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx); 2678 } 2679 return; 2680 } 2681 2682 for_each_possible_cpu(cpu) { 2683 const struct macsec_tx_sa_stats *stats = 2684 per_cpu_ptr(tx_sa->stats, cpu); 2685 2686 sum->OutPktsProtected += stats->OutPktsProtected; 2687 sum->OutPktsEncrypted += stats->OutPktsEncrypted; 2688 } 2689 } 2690 2691 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum) 2692 { 2693 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, 2694 sum->OutPktsProtected) || 2695 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2696 sum->OutPktsEncrypted)) 2697 return -EMSGSIZE; 2698 2699 return 0; 2700 } 2701 2702 static void get_rx_sa_stats(struct net_device *dev, 2703 struct macsec_rx_sc *rx_sc, int an, 2704 struct macsec_rx_sa *rx_sa, 2705 struct macsec_rx_sa_stats *sum) 2706 { 2707 struct macsec_dev *macsec = macsec_priv(dev); 2708 int cpu; 2709 2710 /* If h/w offloading is available, propagate to the device */ 2711 if (macsec_is_offloaded(macsec)) { 2712 const struct macsec_ops *ops; 2713 struct macsec_context ctx; 2714 2715 ops = macsec_get_ops(macsec, &ctx); 2716 if (ops) { 2717 ctx.sa.assoc_num = an; 2718 ctx.sa.rx_sa = rx_sa; 2719 ctx.stats.rx_sa_stats = sum; 2720 ctx.secy = &macsec_priv(dev)->secy; 2721 ctx.rx_sc = rx_sc; 2722 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx); 2723 } 2724 return; 2725 } 2726 2727 for_each_possible_cpu(cpu) { 2728 const struct macsec_rx_sa_stats *stats = 2729 per_cpu_ptr(rx_sa->stats, cpu); 2730 2731 sum->InPktsOK += stats->InPktsOK; 2732 sum->InPktsInvalid += stats->InPktsInvalid; 2733 sum->InPktsNotValid += stats->InPktsNotValid; 2734 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA; 2735 sum->InPktsUnusedSA += stats->InPktsUnusedSA; 2736 } 2737 } 2738 2739 static int copy_rx_sa_stats(struct sk_buff *skb, 2740 struct macsec_rx_sa_stats *sum) 2741 { 2742 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) || 2743 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, 2744 sum->InPktsInvalid) || 2745 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, 2746 sum->InPktsNotValid) || 2747 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2748 sum->InPktsNotUsingSA) || 2749 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, 2750 sum->InPktsUnusedSA)) 2751 return -EMSGSIZE; 2752 2753 return 0; 2754 } 2755 2756 static void get_rx_sc_stats(struct net_device *dev, 2757 struct macsec_rx_sc *rx_sc, 2758 struct macsec_rx_sc_stats *sum) 2759 { 2760 struct macsec_dev *macsec = macsec_priv(dev); 2761 int cpu; 2762 2763 /* If h/w offloading is available, propagate to the device */ 2764 if (macsec_is_offloaded(macsec)) { 2765 const struct macsec_ops *ops; 2766 struct macsec_context ctx; 2767 2768 ops = macsec_get_ops(macsec, &ctx); 2769 if (ops) { 2770 ctx.stats.rx_sc_stats = sum; 2771 ctx.secy = &macsec_priv(dev)->secy; 2772 ctx.rx_sc = rx_sc; 2773 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx); 2774 } 2775 return; 2776 } 2777 2778 for_each_possible_cpu(cpu) { 2779 const struct pcpu_rx_sc_stats *stats; 2780 struct macsec_rx_sc_stats tmp; 2781 unsigned int start; 2782 2783 stats = per_cpu_ptr(rx_sc->stats, cpu); 2784 do { 2785 start = u64_stats_fetch_begin_irq(&stats->syncp); 2786 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2787 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2788 2789 sum->InOctetsValidated += tmp.InOctetsValidated; 2790 sum->InOctetsDecrypted += tmp.InOctetsDecrypted; 2791 sum->InPktsUnchecked += tmp.InPktsUnchecked; 2792 sum->InPktsDelayed += tmp.InPktsDelayed; 2793 sum->InPktsOK += tmp.InPktsOK; 2794 sum->InPktsInvalid += tmp.InPktsInvalid; 2795 sum->InPktsLate += tmp.InPktsLate; 2796 sum->InPktsNotValid += tmp.InPktsNotValid; 2797 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2798 sum->InPktsUnusedSA += tmp.InPktsUnusedSA; 2799 } 2800 } 2801 2802 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum) 2803 { 2804 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2805 sum->InOctetsValidated, 2806 MACSEC_RXSC_STATS_ATTR_PAD) || 2807 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2808 sum->InOctetsDecrypted, 2809 MACSEC_RXSC_STATS_ATTR_PAD) || 2810 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2811 sum->InPktsUnchecked, 2812 MACSEC_RXSC_STATS_ATTR_PAD) || 2813 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2814 sum->InPktsDelayed, 2815 MACSEC_RXSC_STATS_ATTR_PAD) || 2816 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2817 sum->InPktsOK, 2818 MACSEC_RXSC_STATS_ATTR_PAD) || 2819 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2820 sum->InPktsInvalid, 2821 MACSEC_RXSC_STATS_ATTR_PAD) || 2822 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2823 sum->InPktsLate, 2824 MACSEC_RXSC_STATS_ATTR_PAD) || 2825 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2826 sum->InPktsNotValid, 2827 MACSEC_RXSC_STATS_ATTR_PAD) || 2828 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2829 sum->InPktsNotUsingSA, 2830 MACSEC_RXSC_STATS_ATTR_PAD) || 2831 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2832 sum->InPktsUnusedSA, 2833 MACSEC_RXSC_STATS_ATTR_PAD)) 2834 return -EMSGSIZE; 2835 2836 return 0; 2837 } 2838 2839 static void get_tx_sc_stats(struct net_device *dev, 2840 struct macsec_tx_sc_stats *sum) 2841 { 2842 struct macsec_dev *macsec = macsec_priv(dev); 2843 int cpu; 2844 2845 /* If h/w offloading is available, propagate to the device */ 2846 if (macsec_is_offloaded(macsec)) { 2847 const struct macsec_ops *ops; 2848 struct macsec_context ctx; 2849 2850 ops = macsec_get_ops(macsec, &ctx); 2851 if (ops) { 2852 ctx.stats.tx_sc_stats = sum; 2853 ctx.secy = &macsec_priv(dev)->secy; 2854 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx); 2855 } 2856 return; 2857 } 2858 2859 for_each_possible_cpu(cpu) { 2860 const struct pcpu_tx_sc_stats *stats; 2861 struct macsec_tx_sc_stats tmp; 2862 unsigned int start; 2863 2864 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu); 2865 do { 2866 start = u64_stats_fetch_begin_irq(&stats->syncp); 2867 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2868 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2869 2870 sum->OutPktsProtected += tmp.OutPktsProtected; 2871 sum->OutPktsEncrypted += tmp.OutPktsEncrypted; 2872 sum->OutOctetsProtected += tmp.OutOctetsProtected; 2873 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2874 } 2875 } 2876 2877 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum) 2878 { 2879 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2880 sum->OutPktsProtected, 2881 MACSEC_TXSC_STATS_ATTR_PAD) || 2882 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2883 sum->OutPktsEncrypted, 2884 MACSEC_TXSC_STATS_ATTR_PAD) || 2885 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2886 sum->OutOctetsProtected, 2887 MACSEC_TXSC_STATS_ATTR_PAD) || 2888 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2889 sum->OutOctetsEncrypted, 2890 MACSEC_TXSC_STATS_ATTR_PAD)) 2891 return -EMSGSIZE; 2892 2893 return 0; 2894 } 2895 2896 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum) 2897 { 2898 struct macsec_dev *macsec = macsec_priv(dev); 2899 int cpu; 2900 2901 /* If h/w offloading is available, propagate to the device */ 2902 if (macsec_is_offloaded(macsec)) { 2903 const struct macsec_ops *ops; 2904 struct macsec_context ctx; 2905 2906 ops = macsec_get_ops(macsec, &ctx); 2907 if (ops) { 2908 ctx.stats.dev_stats = sum; 2909 ctx.secy = &macsec_priv(dev)->secy; 2910 macsec_offload(ops->mdo_get_dev_stats, &ctx); 2911 } 2912 return; 2913 } 2914 2915 for_each_possible_cpu(cpu) { 2916 const struct pcpu_secy_stats *stats; 2917 struct macsec_dev_stats tmp; 2918 unsigned int start; 2919 2920 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu); 2921 do { 2922 start = u64_stats_fetch_begin_irq(&stats->syncp); 2923 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2924 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2925 2926 sum->OutPktsUntagged += tmp.OutPktsUntagged; 2927 sum->InPktsUntagged += tmp.InPktsUntagged; 2928 sum->OutPktsTooLong += tmp.OutPktsTooLong; 2929 sum->InPktsNoTag += tmp.InPktsNoTag; 2930 sum->InPktsBadTag += tmp.InPktsBadTag; 2931 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2932 sum->InPktsNoSCI += tmp.InPktsNoSCI; 2933 sum->InPktsOverrun += tmp.InPktsOverrun; 2934 } 2935 } 2936 2937 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum) 2938 { 2939 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 2940 sum->OutPktsUntagged, 2941 MACSEC_SECY_STATS_ATTR_PAD) || 2942 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 2943 sum->InPktsUntagged, 2944 MACSEC_SECY_STATS_ATTR_PAD) || 2945 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 2946 sum->OutPktsTooLong, 2947 MACSEC_SECY_STATS_ATTR_PAD) || 2948 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 2949 sum->InPktsNoTag, 2950 MACSEC_SECY_STATS_ATTR_PAD) || 2951 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 2952 sum->InPktsBadTag, 2953 MACSEC_SECY_STATS_ATTR_PAD) || 2954 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 2955 sum->InPktsUnknownSCI, 2956 MACSEC_SECY_STATS_ATTR_PAD) || 2957 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 2958 sum->InPktsNoSCI, 2959 MACSEC_SECY_STATS_ATTR_PAD) || 2960 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 2961 sum->InPktsOverrun, 2962 MACSEC_SECY_STATS_ATTR_PAD)) 2963 return -EMSGSIZE; 2964 2965 return 0; 2966 } 2967 2968 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 2969 { 2970 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2971 struct nlattr *secy_nest = nla_nest_start_noflag(skb, 2972 MACSEC_ATTR_SECY); 2973 u64 csid; 2974 2975 if (!secy_nest) 2976 return 1; 2977 2978 switch (secy->key_len) { 2979 case MACSEC_GCM_AES_128_SAK_LEN: 2980 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 2981 break; 2982 case MACSEC_GCM_AES_256_SAK_LEN: 2983 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 2984 break; 2985 default: 2986 goto cancel; 2987 } 2988 2989 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 2990 MACSEC_SECY_ATTR_PAD) || 2991 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 2992 csid, MACSEC_SECY_ATTR_PAD) || 2993 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 2994 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 2995 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 2996 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 2997 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 2998 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 2999 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 3000 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 3001 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 3002 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 3003 goto cancel; 3004 3005 if (secy->replay_protect) { 3006 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 3007 goto cancel; 3008 } 3009 3010 nla_nest_end(skb, secy_nest); 3011 return 0; 3012 3013 cancel: 3014 nla_nest_cancel(skb, secy_nest); 3015 return 1; 3016 } 3017 3018 static noinline_for_stack int 3019 dump_secy(struct macsec_secy *secy, struct net_device *dev, 3020 struct sk_buff *skb, struct netlink_callback *cb) 3021 { 3022 struct macsec_tx_sc_stats tx_sc_stats = {0, }; 3023 struct macsec_tx_sa_stats tx_sa_stats = {0, }; 3024 struct macsec_rx_sc_stats rx_sc_stats = {0, }; 3025 struct macsec_rx_sa_stats rx_sa_stats = {0, }; 3026 struct macsec_dev *macsec = netdev_priv(dev); 3027 struct macsec_dev_stats dev_stats = {0, }; 3028 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3029 struct nlattr *txsa_list, *rxsc_list; 3030 struct macsec_rx_sc *rx_sc; 3031 struct nlattr *attr; 3032 void *hdr; 3033 int i, j; 3034 3035 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3036 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 3037 if (!hdr) 3038 return -EMSGSIZE; 3039 3040 genl_dump_check_consistent(cb, hdr); 3041 3042 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 3043 goto nla_put_failure; 3044 3045 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD); 3046 if (!attr) 3047 goto nla_put_failure; 3048 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload)) 3049 goto nla_put_failure; 3050 nla_nest_end(skb, attr); 3051 3052 if (nla_put_secy(secy, skb)) 3053 goto nla_put_failure; 3054 3055 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS); 3056 if (!attr) 3057 goto nla_put_failure; 3058 3059 get_tx_sc_stats(dev, &tx_sc_stats); 3060 if (copy_tx_sc_stats(skb, &tx_sc_stats)) { 3061 nla_nest_cancel(skb, attr); 3062 goto nla_put_failure; 3063 } 3064 nla_nest_end(skb, attr); 3065 3066 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS); 3067 if (!attr) 3068 goto nla_put_failure; 3069 get_secy_stats(dev, &dev_stats); 3070 if (copy_secy_stats(skb, &dev_stats)) { 3071 nla_nest_cancel(skb, attr); 3072 goto nla_put_failure; 3073 } 3074 nla_nest_end(skb, attr); 3075 3076 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST); 3077 if (!txsa_list) 3078 goto nla_put_failure; 3079 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 3080 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 3081 struct nlattr *txsa_nest; 3082 u64 pn; 3083 int pn_len; 3084 3085 if (!tx_sa) 3086 continue; 3087 3088 txsa_nest = nla_nest_start_noflag(skb, j++); 3089 if (!txsa_nest) { 3090 nla_nest_cancel(skb, txsa_list); 3091 goto nla_put_failure; 3092 } 3093 3094 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS); 3095 if (!attr) { 3096 nla_nest_cancel(skb, txsa_nest); 3097 nla_nest_cancel(skb, txsa_list); 3098 goto nla_put_failure; 3099 } 3100 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats)); 3101 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats); 3102 if (copy_tx_sa_stats(skb, &tx_sa_stats)) { 3103 nla_nest_cancel(skb, attr); 3104 nla_nest_cancel(skb, txsa_nest); 3105 nla_nest_cancel(skb, txsa_list); 3106 goto nla_put_failure; 3107 } 3108 nla_nest_end(skb, attr); 3109 3110 if (secy->xpn) { 3111 pn = tx_sa->next_pn; 3112 pn_len = MACSEC_XPN_PN_LEN; 3113 } else { 3114 pn = tx_sa->next_pn_halves.lower; 3115 pn_len = MACSEC_DEFAULT_PN_LEN; 3116 } 3117 3118 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3119 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3120 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 3121 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) || 3122 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 3123 nla_nest_cancel(skb, txsa_nest); 3124 nla_nest_cancel(skb, txsa_list); 3125 goto nla_put_failure; 3126 } 3127 3128 nla_nest_end(skb, txsa_nest); 3129 } 3130 nla_nest_end(skb, txsa_list); 3131 3132 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST); 3133 if (!rxsc_list) 3134 goto nla_put_failure; 3135 3136 j = 1; 3137 for_each_rxsc_rtnl(secy, rx_sc) { 3138 int k; 3139 struct nlattr *rxsa_list; 3140 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++); 3141 3142 if (!rxsc_nest) { 3143 nla_nest_cancel(skb, rxsc_list); 3144 goto nla_put_failure; 3145 } 3146 3147 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 3148 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 3149 MACSEC_RXSC_ATTR_PAD)) { 3150 nla_nest_cancel(skb, rxsc_nest); 3151 nla_nest_cancel(skb, rxsc_list); 3152 goto nla_put_failure; 3153 } 3154 3155 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS); 3156 if (!attr) { 3157 nla_nest_cancel(skb, rxsc_nest); 3158 nla_nest_cancel(skb, rxsc_list); 3159 goto nla_put_failure; 3160 } 3161 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats)); 3162 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats); 3163 if (copy_rx_sc_stats(skb, &rx_sc_stats)) { 3164 nla_nest_cancel(skb, attr); 3165 nla_nest_cancel(skb, rxsc_nest); 3166 nla_nest_cancel(skb, rxsc_list); 3167 goto nla_put_failure; 3168 } 3169 nla_nest_end(skb, attr); 3170 3171 rxsa_list = nla_nest_start_noflag(skb, 3172 MACSEC_RXSC_ATTR_SA_LIST); 3173 if (!rxsa_list) { 3174 nla_nest_cancel(skb, rxsc_nest); 3175 nla_nest_cancel(skb, rxsc_list); 3176 goto nla_put_failure; 3177 } 3178 3179 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 3180 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 3181 struct nlattr *rxsa_nest; 3182 u64 pn; 3183 int pn_len; 3184 3185 if (!rx_sa) 3186 continue; 3187 3188 rxsa_nest = nla_nest_start_noflag(skb, k++); 3189 if (!rxsa_nest) { 3190 nla_nest_cancel(skb, rxsa_list); 3191 nla_nest_cancel(skb, rxsc_nest); 3192 nla_nest_cancel(skb, rxsc_list); 3193 goto nla_put_failure; 3194 } 3195 3196 attr = nla_nest_start_noflag(skb, 3197 MACSEC_SA_ATTR_STATS); 3198 if (!attr) { 3199 nla_nest_cancel(skb, rxsa_list); 3200 nla_nest_cancel(skb, rxsc_nest); 3201 nla_nest_cancel(skb, rxsc_list); 3202 goto nla_put_failure; 3203 } 3204 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats)); 3205 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats); 3206 if (copy_rx_sa_stats(skb, &rx_sa_stats)) { 3207 nla_nest_cancel(skb, attr); 3208 nla_nest_cancel(skb, rxsa_list); 3209 nla_nest_cancel(skb, rxsc_nest); 3210 nla_nest_cancel(skb, rxsc_list); 3211 goto nla_put_failure; 3212 } 3213 nla_nest_end(skb, attr); 3214 3215 if (secy->xpn) { 3216 pn = rx_sa->next_pn; 3217 pn_len = MACSEC_XPN_PN_LEN; 3218 } else { 3219 pn = rx_sa->next_pn_halves.lower; 3220 pn_len = MACSEC_DEFAULT_PN_LEN; 3221 } 3222 3223 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3224 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3225 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 3226 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) || 3227 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 3228 nla_nest_cancel(skb, rxsa_nest); 3229 nla_nest_cancel(skb, rxsc_nest); 3230 nla_nest_cancel(skb, rxsc_list); 3231 goto nla_put_failure; 3232 } 3233 nla_nest_end(skb, rxsa_nest); 3234 } 3235 3236 nla_nest_end(skb, rxsa_list); 3237 nla_nest_end(skb, rxsc_nest); 3238 } 3239 3240 nla_nest_end(skb, rxsc_list); 3241 3242 genlmsg_end(skb, hdr); 3243 3244 return 0; 3245 3246 nla_put_failure: 3247 genlmsg_cancel(skb, hdr); 3248 return -EMSGSIZE; 3249 } 3250 3251 static int macsec_generation = 1; /* protected by RTNL */ 3252 3253 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 3254 { 3255 struct net *net = sock_net(skb->sk); 3256 struct net_device *dev; 3257 int dev_idx, d; 3258 3259 dev_idx = cb->args[0]; 3260 3261 d = 0; 3262 rtnl_lock(); 3263 3264 cb->seq = macsec_generation; 3265 3266 for_each_netdev(net, dev) { 3267 struct macsec_secy *secy; 3268 3269 if (d < dev_idx) 3270 goto next; 3271 3272 if (!netif_is_macsec(dev)) 3273 goto next; 3274 3275 secy = &macsec_priv(dev)->secy; 3276 if (dump_secy(secy, dev, skb, cb) < 0) 3277 goto done; 3278 next: 3279 d++; 3280 } 3281 3282 done: 3283 rtnl_unlock(); 3284 cb->args[0] = d; 3285 return skb->len; 3286 } 3287 3288 static const struct genl_ops macsec_genl_ops[] = { 3289 { 3290 .cmd = MACSEC_CMD_GET_TXSC, 3291 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3292 .dumpit = macsec_dump_txsc, 3293 }, 3294 { 3295 .cmd = MACSEC_CMD_ADD_RXSC, 3296 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3297 .doit = macsec_add_rxsc, 3298 .flags = GENL_ADMIN_PERM, 3299 }, 3300 { 3301 .cmd = MACSEC_CMD_DEL_RXSC, 3302 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3303 .doit = macsec_del_rxsc, 3304 .flags = GENL_ADMIN_PERM, 3305 }, 3306 { 3307 .cmd = MACSEC_CMD_UPD_RXSC, 3308 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3309 .doit = macsec_upd_rxsc, 3310 .flags = GENL_ADMIN_PERM, 3311 }, 3312 { 3313 .cmd = MACSEC_CMD_ADD_TXSA, 3314 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3315 .doit = macsec_add_txsa, 3316 .flags = GENL_ADMIN_PERM, 3317 }, 3318 { 3319 .cmd = MACSEC_CMD_DEL_TXSA, 3320 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3321 .doit = macsec_del_txsa, 3322 .flags = GENL_ADMIN_PERM, 3323 }, 3324 { 3325 .cmd = MACSEC_CMD_UPD_TXSA, 3326 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3327 .doit = macsec_upd_txsa, 3328 .flags = GENL_ADMIN_PERM, 3329 }, 3330 { 3331 .cmd = MACSEC_CMD_ADD_RXSA, 3332 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3333 .doit = macsec_add_rxsa, 3334 .flags = GENL_ADMIN_PERM, 3335 }, 3336 { 3337 .cmd = MACSEC_CMD_DEL_RXSA, 3338 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3339 .doit = macsec_del_rxsa, 3340 .flags = GENL_ADMIN_PERM, 3341 }, 3342 { 3343 .cmd = MACSEC_CMD_UPD_RXSA, 3344 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3345 .doit = macsec_upd_rxsa, 3346 .flags = GENL_ADMIN_PERM, 3347 }, 3348 { 3349 .cmd = MACSEC_CMD_UPD_OFFLOAD, 3350 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3351 .doit = macsec_upd_offload, 3352 .flags = GENL_ADMIN_PERM, 3353 }, 3354 }; 3355 3356 static struct genl_family macsec_fam __ro_after_init = { 3357 .name = MACSEC_GENL_NAME, 3358 .hdrsize = 0, 3359 .version = MACSEC_GENL_VERSION, 3360 .maxattr = MACSEC_ATTR_MAX, 3361 .policy = macsec_genl_policy, 3362 .netnsok = true, 3363 .module = THIS_MODULE, 3364 .ops = macsec_genl_ops, 3365 .n_ops = ARRAY_SIZE(macsec_genl_ops), 3366 }; 3367 3368 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 3369 struct net_device *dev) 3370 { 3371 struct macsec_dev *macsec = netdev_priv(dev); 3372 struct macsec_secy *secy = &macsec->secy; 3373 struct pcpu_secy_stats *secy_stats; 3374 int ret, len; 3375 3376 if (macsec_is_offloaded(netdev_priv(dev))) { 3377 skb->dev = macsec->real_dev; 3378 return dev_queue_xmit(skb); 3379 } 3380 3381 /* 10.5 */ 3382 if (!secy->protect_frames) { 3383 secy_stats = this_cpu_ptr(macsec->stats); 3384 u64_stats_update_begin(&secy_stats->syncp); 3385 secy_stats->stats.OutPktsUntagged++; 3386 u64_stats_update_end(&secy_stats->syncp); 3387 skb->dev = macsec->real_dev; 3388 len = skb->len; 3389 ret = dev_queue_xmit(skb); 3390 count_tx(dev, ret, len); 3391 return ret; 3392 } 3393 3394 if (!secy->operational) { 3395 kfree_skb(skb); 3396 dev->stats.tx_dropped++; 3397 return NETDEV_TX_OK; 3398 } 3399 3400 skb = macsec_encrypt(skb, dev); 3401 if (IS_ERR(skb)) { 3402 if (PTR_ERR(skb) != -EINPROGRESS) 3403 dev->stats.tx_dropped++; 3404 return NETDEV_TX_OK; 3405 } 3406 3407 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 3408 3409 macsec_encrypt_finish(skb, dev); 3410 len = skb->len; 3411 ret = dev_queue_xmit(skb); 3412 count_tx(dev, ret, len); 3413 return ret; 3414 } 3415 3416 #define SW_MACSEC_FEATURES \ 3417 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 3418 3419 /* If h/w offloading is enabled, use real device features save for 3420 * VLAN_FEATURES - they require additional ops 3421 * HW_MACSEC - no reason to report it 3422 */ 3423 #define REAL_DEV_FEATURES(dev) \ 3424 ((dev)->features & ~(NETIF_F_VLAN_FEATURES | NETIF_F_HW_MACSEC)) 3425 3426 static int macsec_dev_init(struct net_device *dev) 3427 { 3428 struct macsec_dev *macsec = macsec_priv(dev); 3429 struct net_device *real_dev = macsec->real_dev; 3430 int err; 3431 3432 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 3433 if (!dev->tstats) 3434 return -ENOMEM; 3435 3436 err = gro_cells_init(&macsec->gro_cells, dev); 3437 if (err) { 3438 free_percpu(dev->tstats); 3439 return err; 3440 } 3441 3442 if (macsec_is_offloaded(macsec)) { 3443 dev->features = REAL_DEV_FEATURES(real_dev); 3444 } else { 3445 dev->features = real_dev->features & SW_MACSEC_FEATURES; 3446 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 3447 } 3448 3449 dev->needed_headroom = real_dev->needed_headroom + 3450 MACSEC_NEEDED_HEADROOM; 3451 dev->needed_tailroom = real_dev->needed_tailroom + 3452 MACSEC_NEEDED_TAILROOM; 3453 3454 if (is_zero_ether_addr(dev->dev_addr)) 3455 eth_hw_addr_inherit(dev, real_dev); 3456 if (is_zero_ether_addr(dev->broadcast)) 3457 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 3458 3459 return 0; 3460 } 3461 3462 static void macsec_dev_uninit(struct net_device *dev) 3463 { 3464 struct macsec_dev *macsec = macsec_priv(dev); 3465 3466 gro_cells_destroy(&macsec->gro_cells); 3467 free_percpu(dev->tstats); 3468 } 3469 3470 static netdev_features_t macsec_fix_features(struct net_device *dev, 3471 netdev_features_t features) 3472 { 3473 struct macsec_dev *macsec = macsec_priv(dev); 3474 struct net_device *real_dev = macsec->real_dev; 3475 3476 if (macsec_is_offloaded(macsec)) 3477 return REAL_DEV_FEATURES(real_dev); 3478 3479 features &= (real_dev->features & SW_MACSEC_FEATURES) | 3480 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 3481 features |= NETIF_F_LLTX; 3482 3483 return features; 3484 } 3485 3486 static int macsec_dev_open(struct net_device *dev) 3487 { 3488 struct macsec_dev *macsec = macsec_priv(dev); 3489 struct net_device *real_dev = macsec->real_dev; 3490 int err; 3491 3492 err = dev_uc_add(real_dev, dev->dev_addr); 3493 if (err < 0) 3494 return err; 3495 3496 if (dev->flags & IFF_ALLMULTI) { 3497 err = dev_set_allmulti(real_dev, 1); 3498 if (err < 0) 3499 goto del_unicast; 3500 } 3501 3502 if (dev->flags & IFF_PROMISC) { 3503 err = dev_set_promiscuity(real_dev, 1); 3504 if (err < 0) 3505 goto clear_allmulti; 3506 } 3507 3508 /* If h/w offloading is available, propagate to the device */ 3509 if (macsec_is_offloaded(macsec)) { 3510 const struct macsec_ops *ops; 3511 struct macsec_context ctx; 3512 3513 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3514 if (!ops) { 3515 err = -EOPNOTSUPP; 3516 goto clear_allmulti; 3517 } 3518 3519 ctx.secy = &macsec->secy; 3520 err = macsec_offload(ops->mdo_dev_open, &ctx); 3521 if (err) 3522 goto clear_allmulti; 3523 } 3524 3525 if (netif_carrier_ok(real_dev)) 3526 netif_carrier_on(dev); 3527 3528 return 0; 3529 clear_allmulti: 3530 if (dev->flags & IFF_ALLMULTI) 3531 dev_set_allmulti(real_dev, -1); 3532 del_unicast: 3533 dev_uc_del(real_dev, dev->dev_addr); 3534 netif_carrier_off(dev); 3535 return err; 3536 } 3537 3538 static int macsec_dev_stop(struct net_device *dev) 3539 { 3540 struct macsec_dev *macsec = macsec_priv(dev); 3541 struct net_device *real_dev = macsec->real_dev; 3542 3543 netif_carrier_off(dev); 3544 3545 /* If h/w offloading is available, propagate to the device */ 3546 if (macsec_is_offloaded(macsec)) { 3547 const struct macsec_ops *ops; 3548 struct macsec_context ctx; 3549 3550 ops = macsec_get_ops(macsec, &ctx); 3551 if (ops) { 3552 ctx.secy = &macsec->secy; 3553 macsec_offload(ops->mdo_dev_stop, &ctx); 3554 } 3555 } 3556 3557 dev_mc_unsync(real_dev, dev); 3558 dev_uc_unsync(real_dev, dev); 3559 3560 if (dev->flags & IFF_ALLMULTI) 3561 dev_set_allmulti(real_dev, -1); 3562 3563 if (dev->flags & IFF_PROMISC) 3564 dev_set_promiscuity(real_dev, -1); 3565 3566 dev_uc_del(real_dev, dev->dev_addr); 3567 3568 return 0; 3569 } 3570 3571 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 3572 { 3573 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3574 3575 if (!(dev->flags & IFF_UP)) 3576 return; 3577 3578 if (change & IFF_ALLMULTI) 3579 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 3580 3581 if (change & IFF_PROMISC) 3582 dev_set_promiscuity(real_dev, 3583 dev->flags & IFF_PROMISC ? 1 : -1); 3584 } 3585 3586 static void macsec_dev_set_rx_mode(struct net_device *dev) 3587 { 3588 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3589 3590 dev_mc_sync(real_dev, dev); 3591 dev_uc_sync(real_dev, dev); 3592 } 3593 3594 static int macsec_set_mac_address(struct net_device *dev, void *p) 3595 { 3596 struct macsec_dev *macsec = macsec_priv(dev); 3597 struct net_device *real_dev = macsec->real_dev; 3598 struct sockaddr *addr = p; 3599 int err; 3600 3601 if (!is_valid_ether_addr(addr->sa_data)) 3602 return -EADDRNOTAVAIL; 3603 3604 if (!(dev->flags & IFF_UP)) 3605 goto out; 3606 3607 err = dev_uc_add(real_dev, addr->sa_data); 3608 if (err < 0) 3609 return err; 3610 3611 dev_uc_del(real_dev, dev->dev_addr); 3612 3613 out: 3614 ether_addr_copy(dev->dev_addr, addr->sa_data); 3615 macsec->secy.sci = dev_to_sci(dev, MACSEC_PORT_ES); 3616 3617 /* If h/w offloading is available, propagate to the device */ 3618 if (macsec_is_offloaded(macsec)) { 3619 const struct macsec_ops *ops; 3620 struct macsec_context ctx; 3621 3622 ops = macsec_get_ops(macsec, &ctx); 3623 if (ops) { 3624 ctx.secy = &macsec->secy; 3625 macsec_offload(ops->mdo_upd_secy, &ctx); 3626 } 3627 } 3628 3629 return 0; 3630 } 3631 3632 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 3633 { 3634 struct macsec_dev *macsec = macsec_priv(dev); 3635 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 3636 3637 if (macsec->real_dev->mtu - extra < new_mtu) 3638 return -ERANGE; 3639 3640 dev->mtu = new_mtu; 3641 3642 return 0; 3643 } 3644 3645 static void macsec_get_stats64(struct net_device *dev, 3646 struct rtnl_link_stats64 *s) 3647 { 3648 int cpu; 3649 3650 if (!dev->tstats) 3651 return; 3652 3653 for_each_possible_cpu(cpu) { 3654 struct pcpu_sw_netstats *stats; 3655 struct pcpu_sw_netstats tmp; 3656 int start; 3657 3658 stats = per_cpu_ptr(dev->tstats, cpu); 3659 do { 3660 start = u64_stats_fetch_begin_irq(&stats->syncp); 3661 tmp.rx_packets = stats->rx_packets; 3662 tmp.rx_bytes = stats->rx_bytes; 3663 tmp.tx_packets = stats->tx_packets; 3664 tmp.tx_bytes = stats->tx_bytes; 3665 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 3666 3667 s->rx_packets += tmp.rx_packets; 3668 s->rx_bytes += tmp.rx_bytes; 3669 s->tx_packets += tmp.tx_packets; 3670 s->tx_bytes += tmp.tx_bytes; 3671 } 3672 3673 s->rx_dropped = dev->stats.rx_dropped; 3674 s->tx_dropped = dev->stats.tx_dropped; 3675 } 3676 3677 static int macsec_get_iflink(const struct net_device *dev) 3678 { 3679 return macsec_priv(dev)->real_dev->ifindex; 3680 } 3681 3682 static const struct net_device_ops macsec_netdev_ops = { 3683 .ndo_init = macsec_dev_init, 3684 .ndo_uninit = macsec_dev_uninit, 3685 .ndo_open = macsec_dev_open, 3686 .ndo_stop = macsec_dev_stop, 3687 .ndo_fix_features = macsec_fix_features, 3688 .ndo_change_mtu = macsec_change_mtu, 3689 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 3690 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 3691 .ndo_set_mac_address = macsec_set_mac_address, 3692 .ndo_start_xmit = macsec_start_xmit, 3693 .ndo_get_stats64 = macsec_get_stats64, 3694 .ndo_get_iflink = macsec_get_iflink, 3695 }; 3696 3697 static const struct device_type macsec_type = { 3698 .name = "macsec", 3699 }; 3700 3701 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 3702 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 3703 [IFLA_MACSEC_PORT] = { .type = NLA_U16 }, 3704 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 3705 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 3706 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 3707 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 3708 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 3709 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 3710 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 3711 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 3712 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 3713 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 3714 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 3715 }; 3716 3717 static void macsec_free_netdev(struct net_device *dev) 3718 { 3719 struct macsec_dev *macsec = macsec_priv(dev); 3720 3721 free_percpu(macsec->stats); 3722 free_percpu(macsec->secy.tx_sc.stats); 3723 3724 } 3725 3726 static void macsec_setup(struct net_device *dev) 3727 { 3728 ether_setup(dev); 3729 dev->min_mtu = 0; 3730 dev->max_mtu = ETH_MAX_MTU; 3731 dev->priv_flags |= IFF_NO_QUEUE; 3732 dev->netdev_ops = &macsec_netdev_ops; 3733 dev->needs_free_netdev = true; 3734 dev->priv_destructor = macsec_free_netdev; 3735 SET_NETDEV_DEVTYPE(dev, &macsec_type); 3736 3737 eth_zero_addr(dev->broadcast); 3738 } 3739 3740 static int macsec_changelink_common(struct net_device *dev, 3741 struct nlattr *data[]) 3742 { 3743 struct macsec_secy *secy; 3744 struct macsec_tx_sc *tx_sc; 3745 3746 secy = &macsec_priv(dev)->secy; 3747 tx_sc = &secy->tx_sc; 3748 3749 if (data[IFLA_MACSEC_ENCODING_SA]) { 3750 struct macsec_tx_sa *tx_sa; 3751 3752 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3753 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 3754 3755 secy->operational = tx_sa && tx_sa->active; 3756 } 3757 3758 if (data[IFLA_MACSEC_WINDOW]) 3759 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3760 3761 if (data[IFLA_MACSEC_ENCRYPT]) 3762 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3763 3764 if (data[IFLA_MACSEC_PROTECT]) 3765 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3766 3767 if (data[IFLA_MACSEC_INC_SCI]) 3768 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3769 3770 if (data[IFLA_MACSEC_ES]) 3771 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3772 3773 if (data[IFLA_MACSEC_SCB]) 3774 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3775 3776 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3777 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3778 3779 if (data[IFLA_MACSEC_VALIDATION]) 3780 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3781 3782 if (data[IFLA_MACSEC_CIPHER_SUITE]) { 3783 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) { 3784 case MACSEC_CIPHER_ID_GCM_AES_128: 3785 case MACSEC_DEFAULT_CIPHER_ID: 3786 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3787 secy->xpn = false; 3788 break; 3789 case MACSEC_CIPHER_ID_GCM_AES_256: 3790 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3791 secy->xpn = false; 3792 break; 3793 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 3794 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3795 secy->xpn = true; 3796 break; 3797 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 3798 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3799 secy->xpn = true; 3800 break; 3801 default: 3802 return -EINVAL; 3803 } 3804 } 3805 3806 return 0; 3807 } 3808 3809 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3810 struct nlattr *data[], 3811 struct netlink_ext_ack *extack) 3812 { 3813 struct macsec_dev *macsec = macsec_priv(dev); 3814 struct macsec_tx_sc tx_sc; 3815 struct macsec_secy secy; 3816 int ret; 3817 3818 if (!data) 3819 return 0; 3820 3821 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3822 data[IFLA_MACSEC_ICV_LEN] || 3823 data[IFLA_MACSEC_SCI] || 3824 data[IFLA_MACSEC_PORT]) 3825 return -EINVAL; 3826 3827 /* Keep a copy of unmodified secy and tx_sc, in case the offload 3828 * propagation fails, to revert macsec_changelink_common. 3829 */ 3830 memcpy(&secy, &macsec->secy, sizeof(secy)); 3831 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc)); 3832 3833 ret = macsec_changelink_common(dev, data); 3834 if (ret) 3835 return ret; 3836 3837 /* If h/w offloading is available, propagate to the device */ 3838 if (macsec_is_offloaded(macsec)) { 3839 const struct macsec_ops *ops; 3840 struct macsec_context ctx; 3841 int ret; 3842 3843 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3844 if (!ops) { 3845 ret = -EOPNOTSUPP; 3846 goto cleanup; 3847 } 3848 3849 ctx.secy = &macsec->secy; 3850 ret = macsec_offload(ops->mdo_upd_secy, &ctx); 3851 if (ret) 3852 goto cleanup; 3853 } 3854 3855 return 0; 3856 3857 cleanup: 3858 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc)); 3859 memcpy(&macsec->secy, &secy, sizeof(secy)); 3860 3861 return ret; 3862 } 3863 3864 static void macsec_del_dev(struct macsec_dev *macsec) 3865 { 3866 int i; 3867 3868 while (macsec->secy.rx_sc) { 3869 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 3870 3871 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 3872 free_rx_sc(rx_sc); 3873 } 3874 3875 for (i = 0; i < MACSEC_NUM_AN; i++) { 3876 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 3877 3878 if (sa) { 3879 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 3880 clear_tx_sa(sa); 3881 } 3882 } 3883 } 3884 3885 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 3886 { 3887 struct macsec_dev *macsec = macsec_priv(dev); 3888 struct net_device *real_dev = macsec->real_dev; 3889 3890 unregister_netdevice_queue(dev, head); 3891 list_del_rcu(&macsec->secys); 3892 macsec_del_dev(macsec); 3893 netdev_upper_dev_unlink(real_dev, dev); 3894 3895 macsec_generation++; 3896 } 3897 3898 static void macsec_dellink(struct net_device *dev, struct list_head *head) 3899 { 3900 struct macsec_dev *macsec = macsec_priv(dev); 3901 struct net_device *real_dev = macsec->real_dev; 3902 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3903 3904 /* If h/w offloading is available, propagate to the device */ 3905 if (macsec_is_offloaded(macsec)) { 3906 const struct macsec_ops *ops; 3907 struct macsec_context ctx; 3908 3909 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3910 if (ops) { 3911 ctx.secy = &macsec->secy; 3912 macsec_offload(ops->mdo_del_secy, &ctx); 3913 } 3914 } 3915 3916 macsec_common_dellink(dev, head); 3917 3918 if (list_empty(&rxd->secys)) { 3919 netdev_rx_handler_unregister(real_dev); 3920 kfree(rxd); 3921 } 3922 } 3923 3924 static int register_macsec_dev(struct net_device *real_dev, 3925 struct net_device *dev) 3926 { 3927 struct macsec_dev *macsec = macsec_priv(dev); 3928 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3929 3930 if (!rxd) { 3931 int err; 3932 3933 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 3934 if (!rxd) 3935 return -ENOMEM; 3936 3937 INIT_LIST_HEAD(&rxd->secys); 3938 3939 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 3940 rxd); 3941 if (err < 0) { 3942 kfree(rxd); 3943 return err; 3944 } 3945 } 3946 3947 list_add_tail_rcu(&macsec->secys, &rxd->secys); 3948 return 0; 3949 } 3950 3951 static bool sci_exists(struct net_device *dev, sci_t sci) 3952 { 3953 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 3954 struct macsec_dev *macsec; 3955 3956 list_for_each_entry(macsec, &rxd->secys, secys) { 3957 if (macsec->secy.sci == sci) 3958 return true; 3959 } 3960 3961 return false; 3962 } 3963 3964 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 3965 { 3966 struct macsec_dev *macsec = macsec_priv(dev); 3967 struct macsec_secy *secy = &macsec->secy; 3968 3969 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 3970 if (!macsec->stats) 3971 return -ENOMEM; 3972 3973 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 3974 if (!secy->tx_sc.stats) { 3975 free_percpu(macsec->stats); 3976 return -ENOMEM; 3977 } 3978 3979 if (sci == MACSEC_UNDEF_SCI) 3980 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3981 3982 secy->netdev = dev; 3983 secy->operational = true; 3984 secy->key_len = DEFAULT_SAK_LEN; 3985 secy->icv_len = icv_len; 3986 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 3987 secy->protect_frames = true; 3988 secy->replay_protect = false; 3989 secy->xpn = DEFAULT_XPN; 3990 3991 secy->sci = sci; 3992 secy->tx_sc.active = true; 3993 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 3994 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 3995 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 3996 secy->tx_sc.end_station = false; 3997 secy->tx_sc.scb = false; 3998 3999 return 0; 4000 } 4001 4002 static struct lock_class_key macsec_netdev_addr_lock_key; 4003 4004 static int macsec_newlink(struct net *net, struct net_device *dev, 4005 struct nlattr *tb[], struct nlattr *data[], 4006 struct netlink_ext_ack *extack) 4007 { 4008 struct macsec_dev *macsec = macsec_priv(dev); 4009 rx_handler_func_t *rx_handler; 4010 u8 icv_len = DEFAULT_ICV_LEN; 4011 struct net_device *real_dev; 4012 int err, mtu; 4013 sci_t sci; 4014 4015 if (!tb[IFLA_LINK]) 4016 return -EINVAL; 4017 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 4018 if (!real_dev) 4019 return -ENODEV; 4020 if (real_dev->type != ARPHRD_ETHER) 4021 return -EINVAL; 4022 4023 dev->priv_flags |= IFF_MACSEC; 4024 4025 macsec->real_dev = real_dev; 4026 4027 if (data && data[IFLA_MACSEC_OFFLOAD]) 4028 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]); 4029 else 4030 /* MACsec offloading is off by default */ 4031 macsec->offload = MACSEC_OFFLOAD_OFF; 4032 4033 /* Check if the offloading mode is supported by the underlying layers */ 4034 if (macsec->offload != MACSEC_OFFLOAD_OFF && 4035 !macsec_check_offload(macsec->offload, macsec)) 4036 return -EOPNOTSUPP; 4037 4038 if (data && data[IFLA_MACSEC_ICV_LEN]) 4039 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4040 mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 4041 if (mtu < 0) 4042 dev->mtu = 0; 4043 else 4044 dev->mtu = mtu; 4045 4046 rx_handler = rtnl_dereference(real_dev->rx_handler); 4047 if (rx_handler && rx_handler != macsec_handle_frame) 4048 return -EBUSY; 4049 4050 err = register_netdevice(dev); 4051 if (err < 0) 4052 return err; 4053 4054 netdev_lockdep_set_classes(dev); 4055 lockdep_set_class(&dev->addr_list_lock, 4056 &macsec_netdev_addr_lock_key); 4057 4058 err = netdev_upper_dev_link(real_dev, dev, extack); 4059 if (err < 0) 4060 goto unregister; 4061 4062 /* need to be already registered so that ->init has run and 4063 * the MAC addr is set 4064 */ 4065 if (data && data[IFLA_MACSEC_SCI]) 4066 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 4067 else if (data && data[IFLA_MACSEC_PORT]) 4068 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 4069 else 4070 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4071 4072 if (rx_handler && sci_exists(real_dev, sci)) { 4073 err = -EBUSY; 4074 goto unlink; 4075 } 4076 4077 err = macsec_add_dev(dev, sci, icv_len); 4078 if (err) 4079 goto unlink; 4080 4081 if (data) { 4082 err = macsec_changelink_common(dev, data); 4083 if (err) 4084 goto del_dev; 4085 } 4086 4087 /* If h/w offloading is available, propagate to the device */ 4088 if (macsec_is_offloaded(macsec)) { 4089 const struct macsec_ops *ops; 4090 struct macsec_context ctx; 4091 4092 ops = macsec_get_ops(macsec, &ctx); 4093 if (ops) { 4094 ctx.secy = &macsec->secy; 4095 err = macsec_offload(ops->mdo_add_secy, &ctx); 4096 if (err) 4097 goto del_dev; 4098 } 4099 } 4100 4101 err = register_macsec_dev(real_dev, dev); 4102 if (err < 0) 4103 goto del_dev; 4104 4105 netif_stacked_transfer_operstate(real_dev, dev); 4106 linkwatch_fire_event(dev); 4107 4108 macsec_generation++; 4109 4110 return 0; 4111 4112 del_dev: 4113 macsec_del_dev(macsec); 4114 unlink: 4115 netdev_upper_dev_unlink(real_dev, dev); 4116 unregister: 4117 unregister_netdevice(dev); 4118 return err; 4119 } 4120 4121 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], 4122 struct netlink_ext_ack *extack) 4123 { 4124 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 4125 u8 icv_len = DEFAULT_ICV_LEN; 4126 int flag; 4127 bool es, scb, sci; 4128 4129 if (!data) 4130 return 0; 4131 4132 if (data[IFLA_MACSEC_CIPHER_SUITE]) 4133 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 4134 4135 if (data[IFLA_MACSEC_ICV_LEN]) { 4136 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4137 if (icv_len != DEFAULT_ICV_LEN) { 4138 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 4139 struct crypto_aead *dummy_tfm; 4140 4141 dummy_tfm = macsec_alloc_tfm(dummy_key, 4142 DEFAULT_SAK_LEN, 4143 icv_len); 4144 if (IS_ERR(dummy_tfm)) 4145 return PTR_ERR(dummy_tfm); 4146 crypto_free_aead(dummy_tfm); 4147 } 4148 } 4149 4150 switch (csid) { 4151 case MACSEC_CIPHER_ID_GCM_AES_128: 4152 case MACSEC_CIPHER_ID_GCM_AES_256: 4153 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 4154 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 4155 case MACSEC_DEFAULT_CIPHER_ID: 4156 if (icv_len < MACSEC_MIN_ICV_LEN || 4157 icv_len > MACSEC_STD_ICV_LEN) 4158 return -EINVAL; 4159 break; 4160 default: 4161 return -EINVAL; 4162 } 4163 4164 if (data[IFLA_MACSEC_ENCODING_SA]) { 4165 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 4166 return -EINVAL; 4167 } 4168 4169 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 4170 flag < IFLA_MACSEC_VALIDATION; 4171 flag++) { 4172 if (data[flag]) { 4173 if (nla_get_u8(data[flag]) > 1) 4174 return -EINVAL; 4175 } 4176 } 4177 4178 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 4179 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 4180 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 4181 4182 if ((sci && (scb || es)) || (scb && es)) 4183 return -EINVAL; 4184 4185 if (data[IFLA_MACSEC_VALIDATION] && 4186 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 4187 return -EINVAL; 4188 4189 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 4190 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 4191 !data[IFLA_MACSEC_WINDOW]) 4192 return -EINVAL; 4193 4194 return 0; 4195 } 4196 4197 static struct net *macsec_get_link_net(const struct net_device *dev) 4198 { 4199 return dev_net(macsec_priv(dev)->real_dev); 4200 } 4201 4202 static size_t macsec_get_size(const struct net_device *dev) 4203 { 4204 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ 4205 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ 4206 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ 4207 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ 4208 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ 4209 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ 4210 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ 4211 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ 4212 nla_total_size(1) + /* IFLA_MACSEC_ES */ 4213 nla_total_size(1) + /* IFLA_MACSEC_SCB */ 4214 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ 4215 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ 4216 0; 4217 } 4218 4219 static int macsec_fill_info(struct sk_buff *skb, 4220 const struct net_device *dev) 4221 { 4222 struct macsec_secy *secy = &macsec_priv(dev)->secy; 4223 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 4224 u64 csid; 4225 4226 switch (secy->key_len) { 4227 case MACSEC_GCM_AES_128_SAK_LEN: 4228 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 4229 break; 4230 case MACSEC_GCM_AES_256_SAK_LEN: 4231 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 4232 break; 4233 default: 4234 goto nla_put_failure; 4235 } 4236 4237 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 4238 IFLA_MACSEC_PAD) || 4239 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 4240 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 4241 csid, IFLA_MACSEC_PAD) || 4242 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 4243 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 4244 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 4245 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 4246 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 4247 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 4248 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 4249 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 4250 0) 4251 goto nla_put_failure; 4252 4253 if (secy->replay_protect) { 4254 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 4255 goto nla_put_failure; 4256 } 4257 4258 return 0; 4259 4260 nla_put_failure: 4261 return -EMSGSIZE; 4262 } 4263 4264 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 4265 .kind = "macsec", 4266 .priv_size = sizeof(struct macsec_dev), 4267 .maxtype = IFLA_MACSEC_MAX, 4268 .policy = macsec_rtnl_policy, 4269 .setup = macsec_setup, 4270 .validate = macsec_validate_attr, 4271 .newlink = macsec_newlink, 4272 .changelink = macsec_changelink, 4273 .dellink = macsec_dellink, 4274 .get_size = macsec_get_size, 4275 .fill_info = macsec_fill_info, 4276 .get_link_net = macsec_get_link_net, 4277 }; 4278 4279 static bool is_macsec_master(struct net_device *dev) 4280 { 4281 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 4282 } 4283 4284 static int macsec_notify(struct notifier_block *this, unsigned long event, 4285 void *ptr) 4286 { 4287 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 4288 LIST_HEAD(head); 4289 4290 if (!is_macsec_master(real_dev)) 4291 return NOTIFY_DONE; 4292 4293 switch (event) { 4294 case NETDEV_DOWN: 4295 case NETDEV_UP: 4296 case NETDEV_CHANGE: { 4297 struct macsec_dev *m, *n; 4298 struct macsec_rxh_data *rxd; 4299 4300 rxd = macsec_data_rtnl(real_dev); 4301 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4302 struct net_device *dev = m->secy.netdev; 4303 4304 netif_stacked_transfer_operstate(real_dev, dev); 4305 } 4306 break; 4307 } 4308 case NETDEV_UNREGISTER: { 4309 struct macsec_dev *m, *n; 4310 struct macsec_rxh_data *rxd; 4311 4312 rxd = macsec_data_rtnl(real_dev); 4313 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4314 macsec_common_dellink(m->secy.netdev, &head); 4315 } 4316 4317 netdev_rx_handler_unregister(real_dev); 4318 kfree(rxd); 4319 4320 unregister_netdevice_many(&head); 4321 break; 4322 } 4323 case NETDEV_CHANGEMTU: { 4324 struct macsec_dev *m; 4325 struct macsec_rxh_data *rxd; 4326 4327 rxd = macsec_data_rtnl(real_dev); 4328 list_for_each_entry(m, &rxd->secys, secys) { 4329 struct net_device *dev = m->secy.netdev; 4330 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 4331 macsec_extra_len(true)); 4332 4333 if (dev->mtu > mtu) 4334 dev_set_mtu(dev, mtu); 4335 } 4336 } 4337 } 4338 4339 return NOTIFY_OK; 4340 } 4341 4342 static struct notifier_block macsec_notifier = { 4343 .notifier_call = macsec_notify, 4344 }; 4345 4346 static int __init macsec_init(void) 4347 { 4348 int err; 4349 4350 pr_info("MACsec IEEE 802.1AE\n"); 4351 err = register_netdevice_notifier(&macsec_notifier); 4352 if (err) 4353 return err; 4354 4355 err = rtnl_link_register(&macsec_link_ops); 4356 if (err) 4357 goto notifier; 4358 4359 err = genl_register_family(&macsec_fam); 4360 if (err) 4361 goto rtnl; 4362 4363 return 0; 4364 4365 rtnl: 4366 rtnl_link_unregister(&macsec_link_ops); 4367 notifier: 4368 unregister_netdevice_notifier(&macsec_notifier); 4369 return err; 4370 } 4371 4372 static void __exit macsec_exit(void) 4373 { 4374 genl_unregister_family(&macsec_fam); 4375 rtnl_link_unregister(&macsec_link_ops); 4376 unregister_netdevice_notifier(&macsec_notifier); 4377 rcu_barrier(); 4378 } 4379 4380 module_init(macsec_init); 4381 module_exit(macsec_exit); 4382 4383 MODULE_ALIAS_RTNL_LINK("macsec"); 4384 MODULE_ALIAS_GENL_FAMILY("macsec"); 4385 4386 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 4387 MODULE_LICENSE("GPL v2"); 4388