1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * drivers/net/macsec.c - MACsec device 4 * 5 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net> 6 */ 7 8 #include <linux/types.h> 9 #include <linux/skbuff.h> 10 #include <linux/socket.h> 11 #include <linux/module.h> 12 #include <crypto/aead.h> 13 #include <linux/etherdevice.h> 14 #include <linux/netdevice.h> 15 #include <linux/rtnetlink.h> 16 #include <linux/refcount.h> 17 #include <net/genetlink.h> 18 #include <net/sock.h> 19 #include <net/gro_cells.h> 20 #include <net/macsec.h> 21 #include <net/dst_metadata.h> 22 #include <net/rtnetlink.h> 23 #include <net/netdev_lock.h> 24 #include <linux/phy.h> 25 #include <linux/byteorder/generic.h> 26 #include <linux/if_arp.h> 27 28 #include <uapi/linux/if_macsec.h> 29 30 static struct workqueue_struct *macsec_wq; 31 32 /* SecTAG length = macsec_eth_header without the optional SCI */ 33 #define MACSEC_TAG_LEN 6 34 35 struct macsec_eth_header { 36 struct ethhdr eth; 37 /* SecTAG */ 38 u8 tci_an; 39 #if defined(__LITTLE_ENDIAN_BITFIELD) 40 u8 short_length:6, 41 unused:2; 42 #elif defined(__BIG_ENDIAN_BITFIELD) 43 u8 unused:2, 44 short_length:6; 45 #else 46 #error "Please fix <asm/byteorder.h>" 47 #endif 48 __be32 packet_number; 49 u8 secure_channel_id[8]; /* optional */ 50 } __packed; 51 52 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */ 53 #define MIN_NON_SHORT_LEN 48 54 55 #define GCM_AES_IV_LEN 12 56 57 #define for_each_rxsc(secy, sc) \ 58 for (sc = rcu_dereference_bh(secy->rx_sc); \ 59 sc; \ 60 sc = rcu_dereference_bh(sc->next)) 61 #define for_each_rxsc_rtnl(secy, sc) \ 62 for (sc = rtnl_dereference(secy->rx_sc); \ 63 sc; \ 64 sc = rtnl_dereference(sc->next)) 65 66 #define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31))) 67 68 struct gcm_iv_xpn { 69 union { 70 u8 short_secure_channel_id[4]; 71 ssci_t ssci; 72 }; 73 __be64 pn; 74 } __packed; 75 76 struct gcm_iv { 77 union { 78 u8 secure_channel_id[8]; 79 sci_t sci; 80 }; 81 __be32 pn; 82 }; 83 84 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT 85 86 struct pcpu_secy_stats { 87 struct macsec_dev_stats stats; 88 struct u64_stats_sync syncp; 89 }; 90 91 /** 92 * struct macsec_dev - private data 93 * @secy: SecY config 94 * @real_dev: pointer to underlying netdevice 95 * @dev_tracker: refcount tracker for @real_dev reference 96 * @stats: MACsec device stats 97 * @secys: linked list of SecY's on the underlying device 98 * @gro_cells: pointer to the Generic Receive Offload cell 99 * @offload: status of offloading on the MACsec device 100 * @insert_tx_tag: when offloading, device requires to insert an 101 * additional tag 102 */ 103 struct macsec_dev { 104 struct macsec_secy secy; 105 struct net_device *real_dev; 106 netdevice_tracker dev_tracker; 107 struct pcpu_secy_stats __percpu *stats; 108 struct list_head secys; 109 struct gro_cells gro_cells; 110 enum macsec_offload offload; 111 bool insert_tx_tag; 112 }; 113 114 /** 115 * struct macsec_rxh_data - rx_handler private argument 116 * @secys: linked list of SecY's on this underlying device 117 */ 118 struct macsec_rxh_data { 119 struct list_head secys; 120 }; 121 122 static struct macsec_dev *macsec_priv(const struct net_device *dev) 123 { 124 return (struct macsec_dev *)netdev_priv(dev); 125 } 126 127 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev) 128 { 129 return rcu_dereference_bh(dev->rx_handler_data); 130 } 131 132 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev) 133 { 134 return rtnl_dereference(dev->rx_handler_data); 135 } 136 137 struct macsec_cb { 138 struct aead_request *req; 139 union { 140 struct macsec_tx_sa *tx_sa; 141 struct macsec_rx_sa *rx_sa; 142 }; 143 u8 assoc_num; 144 bool valid; 145 bool has_sci; 146 }; 147 148 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr) 149 { 150 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr); 151 152 if (!sa || !sa->active) 153 return NULL; 154 155 if (!refcount_inc_not_zero(&sa->refcnt)) 156 return NULL; 157 158 return sa; 159 } 160 161 static void free_rx_sc_rcu(struct rcu_head *head) 162 { 163 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head); 164 165 free_percpu(rx_sc->stats); 166 kfree(rx_sc); 167 } 168 169 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc) 170 { 171 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL; 172 } 173 174 static void macsec_rxsc_put(struct macsec_rx_sc *sc) 175 { 176 if (refcount_dec_and_test(&sc->refcnt)) 177 call_rcu(&sc->rcu_head, free_rx_sc_rcu); 178 } 179 180 static void free_rxsa_work(struct work_struct *work) 181 { 182 struct macsec_rx_sa *sa = 183 container_of(to_rcu_work(work), struct macsec_rx_sa, destroy_work); 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 queue_rcu_work(macsec_wq, &sa->destroy_work); 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_work(struct work_struct *work) 210 { 211 struct macsec_tx_sa *sa = 212 container_of(to_rcu_work(work), struct macsec_tx_sa, destroy_work); 213 214 crypto_free_aead(sa->key.tfm); 215 free_percpu(sa->stats); 216 kfree(sa); 217 } 218 219 static void macsec_txsa_put(struct macsec_tx_sa *sa) 220 { 221 if (refcount_dec_and_test(&sa->refcnt)) 222 queue_rcu_work(macsec_wq, &sa->destroy_work); 223 } 224 225 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) 226 { 227 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); 228 return (struct macsec_cb *)skb->cb; 229 } 230 231 #define MACSEC_PORT_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 #define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1)) 244 245 static sci_t make_sci(const u8 *addr, __be16 port) 246 { 247 sci_t sci; 248 249 memcpy(&sci, addr, ETH_ALEN); 250 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); 251 252 return sci; 253 } 254 255 static sci_t macsec_active_sci(struct macsec_secy *secy) 256 { 257 struct macsec_rx_sc *rx_sc = rcu_dereference_bh(secy->rx_sc); 258 259 /* Case single RX SC */ 260 if (rx_sc && !rcu_dereference_bh(rx_sc->next)) 261 return (rx_sc->active) ? rx_sc->sci : 0; 262 /* Case no RX SC or multiple */ 263 else 264 return 0; 265 } 266 267 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present, 268 struct macsec_rxh_data *rxd) 269 { 270 struct macsec_dev *macsec; 271 sci_t sci = 0; 272 273 /* SC = 1 */ 274 if (sci_present) { 275 memcpy(&sci, hdr->secure_channel_id, 276 sizeof(hdr->secure_channel_id)); 277 /* SC = 0; ES = 0 */ 278 } else if ((!(hdr->tci_an & (MACSEC_TCI_ES | MACSEC_TCI_SC))) && 279 (list_is_singular(&rxd->secys))) { 280 /* Only one SECY should exist on this scenario */ 281 macsec = list_first_or_null_rcu(&rxd->secys, struct macsec_dev, 282 secys); 283 if (macsec) 284 return macsec_active_sci(&macsec->secy); 285 } else { 286 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); 287 } 288 289 return sci; 290 } 291 292 static unsigned int macsec_sectag_len(bool sci_present) 293 { 294 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); 295 } 296 297 static unsigned int macsec_hdr_len(bool sci_present) 298 { 299 return macsec_sectag_len(sci_present) + ETH_HLEN; 300 } 301 302 static unsigned int macsec_extra_len(bool sci_present) 303 { 304 return macsec_sectag_len(sci_present) + sizeof(__be16); 305 } 306 307 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ 308 static void macsec_fill_sectag(struct macsec_eth_header *h, 309 const struct macsec_secy *secy, u32 pn, 310 bool sci_present) 311 { 312 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 313 314 memset(&h->tci_an, 0, macsec_sectag_len(sci_present)); 315 h->eth.h_proto = htons(ETH_P_MACSEC); 316 317 if (sci_present) { 318 h->tci_an |= MACSEC_TCI_SC; 319 memcpy(&h->secure_channel_id, &secy->sci, 320 sizeof(h->secure_channel_id)); 321 } else { 322 if (tx_sc->end_station) 323 h->tci_an |= MACSEC_TCI_ES; 324 if (tx_sc->scb) 325 h->tci_an |= MACSEC_TCI_SCB; 326 } 327 328 h->packet_number = htonl(pn); 329 330 /* with GCM, C/E clear for !encrypt, both set for encrypt */ 331 if (tx_sc->encrypt) 332 h->tci_an |= MACSEC_TCI_CONFID; 333 else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN) 334 h->tci_an |= MACSEC_TCI_C; 335 336 h->tci_an |= tx_sc->encoding_sa; 337 } 338 339 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) 340 { 341 if (data_len < MIN_NON_SHORT_LEN) 342 h->short_length = data_len; 343 } 344 345 /* Checks if a MACsec interface is being offloaded to an hardware engine */ 346 static bool macsec_is_offloaded(struct macsec_dev *macsec) 347 { 348 if (macsec->offload == MACSEC_OFFLOAD_MAC || 349 macsec->offload == MACSEC_OFFLOAD_PHY) 350 return true; 351 352 return false; 353 } 354 355 /* Checks if underlying layers implement MACsec offloading functions. */ 356 static bool macsec_check_offload(enum macsec_offload offload, 357 struct macsec_dev *macsec) 358 { 359 if (!macsec || !macsec->real_dev) 360 return false; 361 362 if (offload == MACSEC_OFFLOAD_PHY) 363 return macsec->real_dev->phydev && 364 macsec->real_dev->phydev->macsec_ops; 365 else if (offload == MACSEC_OFFLOAD_MAC) 366 return macsec->real_dev->features & NETIF_F_HW_MACSEC && 367 macsec->real_dev->macsec_ops; 368 369 return false; 370 } 371 372 static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload, 373 struct macsec_dev *macsec, 374 struct macsec_context *ctx) 375 { 376 if (ctx) { 377 memset(ctx, 0, sizeof(*ctx)); 378 ctx->offload = offload; 379 380 if (offload == MACSEC_OFFLOAD_PHY) 381 ctx->phydev = macsec->real_dev->phydev; 382 else if (offload == MACSEC_OFFLOAD_MAC) 383 ctx->netdev = macsec->real_dev; 384 } 385 386 if (offload == MACSEC_OFFLOAD_PHY) 387 return macsec->real_dev->phydev->macsec_ops; 388 else 389 return macsec->real_dev->macsec_ops; 390 } 391 392 /* Returns a pointer to the MACsec ops struct if any and updates the MACsec 393 * context device reference if provided. 394 */ 395 static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec, 396 struct macsec_context *ctx) 397 { 398 if (!macsec_check_offload(macsec->offload, macsec)) 399 return NULL; 400 401 return __macsec_get_ops(macsec->offload, macsec, ctx); 402 } 403 404 /* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */ 405 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn) 406 { 407 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; 408 int len = skb->len - 2 * ETH_ALEN; 409 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; 410 411 /* a) It comprises at least 17 octets */ 412 if (skb->len <= 16) 413 return false; 414 415 /* b) MACsec EtherType: already checked */ 416 417 /* c) V bit is clear */ 418 if (h->tci_an & MACSEC_TCI_VERSION) 419 return false; 420 421 /* d) ES or SCB => !SC */ 422 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && 423 (h->tci_an & MACSEC_TCI_SC)) 424 return false; 425 426 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ 427 if (h->unused) 428 return false; 429 430 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */ 431 if (!h->packet_number && !xpn) 432 return false; 433 434 /* length check, f) g) h) i) */ 435 if (h->short_length) 436 return len == extra_len + h->short_length; 437 return len >= extra_len + MIN_NON_SHORT_LEN; 438 } 439 440 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) 441 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN 442 443 static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn, 444 salt_t salt) 445 { 446 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv; 447 448 gcm_iv->ssci = ssci ^ salt.ssci; 449 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn; 450 } 451 452 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) 453 { 454 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; 455 456 gcm_iv->sci = sci; 457 gcm_iv->pn = htonl(pn); 458 } 459 460 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) 461 { 462 return (struct macsec_eth_header *)skb_mac_header(skb); 463 } 464 465 static void __macsec_pn_wrapped(struct macsec_secy *secy, 466 struct macsec_tx_sa *tx_sa) 467 { 468 pr_debug("PN wrapped, transitioning to !oper\n"); 469 tx_sa->active = false; 470 if (secy->protect_frames) 471 secy->operational = false; 472 } 473 474 void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa) 475 { 476 spin_lock_bh(&tx_sa->lock); 477 __macsec_pn_wrapped(secy, tx_sa); 478 spin_unlock_bh(&tx_sa->lock); 479 } 480 EXPORT_SYMBOL_GPL(macsec_pn_wrapped); 481 482 static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa, 483 struct macsec_secy *secy) 484 { 485 pn_t pn; 486 487 spin_lock_bh(&tx_sa->lock); 488 489 pn = tx_sa->next_pn_halves; 490 if (secy->xpn) 491 tx_sa->next_pn++; 492 else 493 tx_sa->next_pn_halves.lower++; 494 495 if (tx_sa->next_pn == 0) 496 __macsec_pn_wrapped(secy, tx_sa); 497 spin_unlock_bh(&tx_sa->lock); 498 499 return pn; 500 } 501 502 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) 503 { 504 struct macsec_dev *macsec = netdev_priv(dev); 505 506 skb->dev = macsec->real_dev; 507 skb_reset_mac_header(skb); 508 skb->protocol = eth_hdr(skb)->h_proto; 509 } 510 511 static unsigned int macsec_msdu_len(struct sk_buff *skb) 512 { 513 struct macsec_dev *macsec = macsec_priv(skb->dev); 514 struct macsec_secy *secy = &macsec->secy; 515 bool sci_present = macsec_skb_cb(skb)->has_sci; 516 517 return skb->len - macsec_hdr_len(sci_present) - secy->icv_len; 518 } 519 520 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, 521 struct macsec_tx_sa *tx_sa) 522 { 523 unsigned int msdu_len = macsec_msdu_len(skb); 524 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); 525 526 u64_stats_update_begin(&txsc_stats->syncp); 527 if (tx_sc->encrypt) { 528 txsc_stats->stats.OutOctetsEncrypted += msdu_len; 529 txsc_stats->stats.OutPktsEncrypted++; 530 this_cpu_inc(tx_sa->stats->OutPktsEncrypted); 531 } else { 532 txsc_stats->stats.OutOctetsProtected += msdu_len; 533 txsc_stats->stats.OutPktsProtected++; 534 this_cpu_inc(tx_sa->stats->OutPktsProtected); 535 } 536 u64_stats_update_end(&txsc_stats->syncp); 537 } 538 539 static void count_tx(struct net_device *dev, int ret, int len) 540 { 541 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) 542 dev_sw_netstats_tx_add(dev, 1, len); 543 } 544 545 static void macsec_encrypt_done(void *data, int err) 546 { 547 struct sk_buff *skb = data; 548 struct net_device *dev = skb->dev; 549 struct macsec_dev *macsec = macsec_priv(dev); 550 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 551 int len, ret; 552 553 aead_request_free(macsec_skb_cb(skb)->req); 554 555 rcu_read_lock_bh(); 556 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 557 /* packet is encrypted/protected so tx_bytes must be calculated */ 558 len = macsec_msdu_len(skb) + 2 * ETH_ALEN; 559 macsec_encrypt_finish(skb, dev); 560 ret = dev_queue_xmit(skb); 561 count_tx(dev, ret, len); 562 rcu_read_unlock_bh(); 563 564 macsec_txsa_put(sa); 565 dev_put(dev); 566 } 567 568 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, 569 unsigned char **iv, 570 struct scatterlist **sg, 571 int num_frags) 572 { 573 size_t size, iv_offset, sg_offset; 574 struct aead_request *req; 575 void *tmp; 576 577 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); 578 iv_offset = size; 579 size += GCM_AES_IV_LEN; 580 581 size = ALIGN(size, __alignof__(struct scatterlist)); 582 sg_offset = size; 583 size += sizeof(struct scatterlist) * num_frags; 584 585 tmp = kmalloc(size, GFP_ATOMIC); 586 if (!tmp) 587 return NULL; 588 589 *iv = (unsigned char *)(tmp + iv_offset); 590 *sg = (struct scatterlist *)(tmp + sg_offset); 591 req = tmp; 592 593 aead_request_set_tfm(req, tfm); 594 595 return req; 596 } 597 598 static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 599 struct net_device *dev) 600 { 601 int ret; 602 struct scatterlist *sg; 603 struct sk_buff *trailer; 604 unsigned char *iv; 605 struct ethhdr *eth; 606 struct macsec_eth_header *hh; 607 size_t unprotected_len; 608 struct aead_request *req; 609 struct macsec_secy *secy; 610 struct macsec_tx_sc *tx_sc; 611 struct macsec_tx_sa *tx_sa; 612 struct macsec_dev *macsec = macsec_priv(dev); 613 bool sci_present; 614 pn_t pn; 615 616 secy = &macsec->secy; 617 tx_sc = &secy->tx_sc; 618 619 /* 10.5.1 TX SA assignment */ 620 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); 621 if (!tx_sa) { 622 secy->operational = false; 623 kfree_skb(skb); 624 return ERR_PTR(-EINVAL); 625 } 626 627 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || 628 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { 629 struct sk_buff *nskb = skb_copy_expand(skb, 630 MACSEC_NEEDED_HEADROOM, 631 MACSEC_NEEDED_TAILROOM, 632 GFP_ATOMIC); 633 if (likely(nskb)) { 634 consume_skb(skb); 635 skb = nskb; 636 } else { 637 macsec_txsa_put(tx_sa); 638 kfree_skb(skb); 639 return ERR_PTR(-ENOMEM); 640 } 641 } else { 642 skb = skb_unshare(skb, GFP_ATOMIC); 643 if (!skb) { 644 macsec_txsa_put(tx_sa); 645 return ERR_PTR(-ENOMEM); 646 } 647 } 648 649 unprotected_len = skb->len; 650 eth = skb_eth_hdr(skb); 651 sci_present = macsec_send_sci(secy); 652 hh = skb_push(skb, macsec_extra_len(sci_present)); 653 memmove(hh, eth, 2 * ETH_ALEN); 654 655 pn = tx_sa_update_pn(tx_sa, secy); 656 if (pn.full64 == 0) { 657 macsec_txsa_put(tx_sa); 658 kfree_skb(skb); 659 return ERR_PTR(-ENOLINK); 660 } 661 macsec_fill_sectag(hh, secy, pn.lower, sci_present); 662 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); 663 664 skb_put(skb, secy->icv_len); 665 666 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { 667 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 668 669 u64_stats_update_begin(&secy_stats->syncp); 670 secy_stats->stats.OutPktsTooLong++; 671 u64_stats_update_end(&secy_stats->syncp); 672 673 macsec_txsa_put(tx_sa); 674 kfree_skb(skb); 675 return ERR_PTR(-EINVAL); 676 } 677 678 ret = skb_cow_data(skb, 0, &trailer); 679 if (unlikely(ret < 0)) { 680 macsec_txsa_put(tx_sa); 681 kfree_skb(skb); 682 return ERR_PTR(ret); 683 } 684 685 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret); 686 if (!req) { 687 macsec_txsa_put(tx_sa); 688 kfree_skb(skb); 689 return ERR_PTR(-ENOMEM); 690 } 691 692 if (secy->xpn) 693 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt); 694 else 695 macsec_fill_iv(iv, secy->sci, pn.lower); 696 697 sg_init_table(sg, ret); 698 ret = skb_to_sgvec(skb, sg, 0, skb->len); 699 if (unlikely(ret < 0)) { 700 aead_request_free(req); 701 macsec_txsa_put(tx_sa); 702 kfree_skb(skb); 703 return ERR_PTR(ret); 704 } 705 706 if (tx_sc->encrypt) { 707 int len = skb->len - macsec_hdr_len(sci_present) - 708 secy->icv_len; 709 aead_request_set_crypt(req, sg, sg, len, iv); 710 aead_request_set_ad(req, macsec_hdr_len(sci_present)); 711 } else { 712 aead_request_set_crypt(req, sg, sg, 0, iv); 713 aead_request_set_ad(req, skb->len - secy->icv_len); 714 } 715 716 macsec_skb_cb(skb)->req = req; 717 macsec_skb_cb(skb)->tx_sa = tx_sa; 718 macsec_skb_cb(skb)->has_sci = sci_present; 719 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 720 721 dev_hold(skb->dev); 722 ret = crypto_aead_encrypt(req); 723 if (ret == -EINPROGRESS) { 724 return ERR_PTR(ret); 725 } else if (ret != 0) { 726 dev_put(skb->dev); 727 kfree_skb(skb); 728 aead_request_free(req); 729 macsec_txsa_put(tx_sa); 730 return ERR_PTR(-EINVAL); 731 } 732 733 dev_put(skb->dev); 734 aead_request_free(req); 735 macsec_txsa_put(tx_sa); 736 737 return skb; 738 } 739 740 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 741 { 742 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 743 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 744 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 745 u32 lowest_pn = 0; 746 747 spin_lock(&rx_sa->lock); 748 if (rx_sa->next_pn_halves.lower >= secy->replay_window) 749 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window; 750 751 /* Now perform replay protection check again 752 * (see IEEE 802.1AE-2006 figure 10-5) 753 */ 754 if (secy->replay_protect && pn < lowest_pn && 755 (!secy->xpn || pn_same_half(pn, lowest_pn))) { 756 spin_unlock(&rx_sa->lock); 757 u64_stats_update_begin(&rxsc_stats->syncp); 758 rxsc_stats->stats.InPktsLate++; 759 u64_stats_update_end(&rxsc_stats->syncp); 760 DEV_STATS_INC(secy->netdev, rx_dropped); 761 return false; 762 } 763 764 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 765 unsigned int msdu_len = macsec_msdu_len(skb); 766 u64_stats_update_begin(&rxsc_stats->syncp); 767 if (hdr->tci_an & MACSEC_TCI_E) 768 rxsc_stats->stats.InOctetsDecrypted += msdu_len; 769 else 770 rxsc_stats->stats.InOctetsValidated += msdu_len; 771 u64_stats_update_end(&rxsc_stats->syncp); 772 } 773 774 if (!macsec_skb_cb(skb)->valid) { 775 spin_unlock(&rx_sa->lock); 776 777 /* 10.6.5 */ 778 if (hdr->tci_an & MACSEC_TCI_C || 779 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 780 u64_stats_update_begin(&rxsc_stats->syncp); 781 rxsc_stats->stats.InPktsNotValid++; 782 u64_stats_update_end(&rxsc_stats->syncp); 783 this_cpu_inc(rx_sa->stats->InPktsNotValid); 784 DEV_STATS_INC(secy->netdev, rx_errors); 785 return false; 786 } 787 788 u64_stats_update_begin(&rxsc_stats->syncp); 789 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 790 rxsc_stats->stats.InPktsInvalid++; 791 this_cpu_inc(rx_sa->stats->InPktsInvalid); 792 } else if (pn < lowest_pn) { 793 rxsc_stats->stats.InPktsDelayed++; 794 } else { 795 rxsc_stats->stats.InPktsUnchecked++; 796 } 797 u64_stats_update_end(&rxsc_stats->syncp); 798 } else { 799 u64_stats_update_begin(&rxsc_stats->syncp); 800 if (pn < lowest_pn) { 801 rxsc_stats->stats.InPktsDelayed++; 802 } else { 803 rxsc_stats->stats.InPktsOK++; 804 this_cpu_inc(rx_sa->stats->InPktsOK); 805 } 806 u64_stats_update_end(&rxsc_stats->syncp); 807 808 // Instead of "pn >=" - to support pn overflow in xpn 809 if (pn + 1 > rx_sa->next_pn_halves.lower) { 810 rx_sa->next_pn_halves.lower = pn + 1; 811 } else if (secy->xpn && 812 (pn + 1 == 0 || 813 !pn_same_half(pn, rx_sa->next_pn_halves.lower))) { 814 rx_sa->next_pn_halves.upper++; 815 rx_sa->next_pn_halves.lower = pn + 1; 816 } 817 818 spin_unlock(&rx_sa->lock); 819 } 820 821 return true; 822 } 823 824 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 825 { 826 skb->pkt_type = PACKET_HOST; 827 skb->protocol = eth_type_trans(skb, dev); 828 829 skb_reset_network_header(skb); 830 if (!skb_transport_header_was_set(skb)) 831 skb_reset_transport_header(skb); 832 skb_reset_mac_len(skb); 833 } 834 835 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 836 { 837 skb->ip_summed = CHECKSUM_NONE; 838 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 839 skb_pull(skb, hdr_len); 840 pskb_trim_unique(skb, skb->len - icv_len); 841 } 842 843 static void count_rx(struct net_device *dev, int len) 844 { 845 dev_sw_netstats_rx_add(dev, len); 846 } 847 848 static void macsec_decrypt_done(void *data, int err) 849 { 850 struct sk_buff *skb = data; 851 struct net_device *dev = skb->dev; 852 struct macsec_dev *macsec = macsec_priv(dev); 853 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 854 struct macsec_rx_sc *rx_sc = rx_sa->sc; 855 int len; 856 u32 pn; 857 858 aead_request_free(macsec_skb_cb(skb)->req); 859 860 if (!err) 861 macsec_skb_cb(skb)->valid = true; 862 863 rcu_read_lock_bh(); 864 pn = ntohl(macsec_ethhdr(skb)->packet_number); 865 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 866 rcu_read_unlock_bh(); 867 kfree_skb(skb); 868 goto out; 869 } 870 871 macsec_finalize_skb(skb, macsec->secy.icv_len, 872 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 873 len = skb->len; 874 macsec_reset_skb(skb, macsec->secy.netdev); 875 876 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS) 877 count_rx(dev, len); 878 879 rcu_read_unlock_bh(); 880 881 out: 882 macsec_rxsa_put(rx_sa); 883 macsec_rxsc_put(rx_sc); 884 dev_put(dev); 885 } 886 887 static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 888 struct net_device *dev, 889 struct macsec_rx_sa *rx_sa, 890 sci_t sci, 891 struct macsec_secy *secy) 892 { 893 int ret; 894 struct scatterlist *sg; 895 struct sk_buff *trailer; 896 unsigned char *iv; 897 struct aead_request *req; 898 struct macsec_eth_header *hdr; 899 u32 hdr_pn; 900 u16 icv_len = secy->icv_len; 901 902 macsec_skb_cb(skb)->valid = false; 903 skb = skb_share_check(skb, GFP_ATOMIC); 904 if (!skb) 905 return ERR_PTR(-ENOMEM); 906 907 ret = skb_cow_data(skb, 0, &trailer); 908 if (unlikely(ret < 0)) { 909 kfree_skb(skb); 910 return ERR_PTR(ret); 911 } 912 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret); 913 if (!req) { 914 kfree_skb(skb); 915 return ERR_PTR(-ENOMEM); 916 } 917 918 hdr = (struct macsec_eth_header *)skb->data; 919 hdr_pn = ntohl(hdr->packet_number); 920 921 if (secy->xpn) { 922 pn_t recovered_pn = rx_sa->next_pn_halves; 923 924 recovered_pn.lower = hdr_pn; 925 if (hdr_pn < rx_sa->next_pn_halves.lower && 926 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower)) 927 recovered_pn.upper++; 928 929 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64, 930 rx_sa->key.salt); 931 } else { 932 macsec_fill_iv(iv, sci, hdr_pn); 933 } 934 935 sg_init_table(sg, ret); 936 ret = skb_to_sgvec(skb, sg, 0, skb->len); 937 if (unlikely(ret < 0)) { 938 aead_request_free(req); 939 kfree_skb(skb); 940 return ERR_PTR(ret); 941 } 942 943 if (hdr->tci_an & MACSEC_TCI_E) { 944 /* confidentiality: ethernet + macsec header 945 * authenticated, encrypted payload 946 */ 947 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 948 949 aead_request_set_crypt(req, sg, sg, len, iv); 950 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 951 skb = skb_unshare(skb, GFP_ATOMIC); 952 if (!skb) { 953 aead_request_free(req); 954 return ERR_PTR(-ENOMEM); 955 } 956 } else { 957 /* integrity only: all headers + data authenticated */ 958 aead_request_set_crypt(req, sg, sg, icv_len, iv); 959 aead_request_set_ad(req, skb->len - icv_len); 960 } 961 962 macsec_skb_cb(skb)->req = req; 963 skb->dev = dev; 964 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 965 966 dev_hold(dev); 967 ret = crypto_aead_decrypt(req); 968 if (ret == -EINPROGRESS) { 969 return ERR_PTR(ret); 970 } else if (ret != 0) { 971 /* decryption/authentication failed 972 * 10.6 if validateFrames is disabled, deliver anyway 973 */ 974 if (ret != -EBADMSG) { 975 kfree_skb(skb); 976 skb = ERR_PTR(ret); 977 } 978 } else { 979 macsec_skb_cb(skb)->valid = true; 980 } 981 dev_put(dev); 982 983 aead_request_free(req); 984 985 return skb; 986 } 987 988 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 989 { 990 struct macsec_rx_sc *rx_sc; 991 992 for_each_rxsc(secy, rx_sc) { 993 if (rx_sc->sci == sci) 994 return rx_sc; 995 } 996 997 return NULL; 998 } 999 1000 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 1001 { 1002 struct macsec_rx_sc *rx_sc; 1003 1004 for_each_rxsc_rtnl(secy, rx_sc) { 1005 if (rx_sc->sci == sci) 1006 return rx_sc; 1007 } 1008 1009 return NULL; 1010 } 1011 1012 static enum rx_handler_result handle_not_macsec(struct sk_buff *skb) 1013 { 1014 /* Deliver to the uncontrolled port by default */ 1015 enum rx_handler_result ret = RX_HANDLER_PASS; 1016 struct ethhdr *hdr = eth_hdr(skb); 1017 struct metadata_dst *md_dst; 1018 struct macsec_rxh_data *rxd; 1019 struct macsec_dev *macsec; 1020 bool is_macsec_md_dst; 1021 1022 rcu_read_lock(); 1023 rxd = macsec_data_rcu(skb->dev); 1024 md_dst = skb_metadata_dst(skb); 1025 is_macsec_md_dst = md_dst && md_dst->type == METADATA_MACSEC; 1026 1027 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1028 struct sk_buff *nskb; 1029 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 1030 struct net_device *ndev = macsec->secy.netdev; 1031 1032 /* If h/w offloading is enabled, HW decodes frames and strips 1033 * the SecTAG, so we have to deduce which port to deliver to. 1034 */ 1035 if (macsec_is_offloaded(macsec) && netif_running(ndev)) { 1036 const struct macsec_ops *ops; 1037 1038 ops = macsec_get_ops(macsec, NULL); 1039 1040 if (ops->rx_uses_md_dst && !is_macsec_md_dst) 1041 continue; 1042 1043 if (is_macsec_md_dst) { 1044 struct macsec_rx_sc *rx_sc; 1045 1046 /* All drivers that implement MACsec offload 1047 * support using skb metadata destinations must 1048 * indicate that they do so. 1049 */ 1050 DEBUG_NET_WARN_ON_ONCE(!ops->rx_uses_md_dst); 1051 rx_sc = find_rx_sc(&macsec->secy, 1052 md_dst->u.macsec_info.sci); 1053 if (!rx_sc) 1054 continue; 1055 /* device indicated macsec offload occurred */ 1056 skb->dev = ndev; 1057 skb->pkt_type = PACKET_HOST; 1058 eth_skb_pkt_type(skb, ndev); 1059 ret = RX_HANDLER_ANOTHER; 1060 goto out; 1061 } 1062 1063 /* This datapath is insecure because it is unable to 1064 * enforce isolation of broadcast/multicast traffic and 1065 * unicast traffic with promiscuous mode on the macsec 1066 * netdev. Since the core stack has no mechanism to 1067 * check that the hardware did indeed receive MACsec 1068 * traffic, it is possible that the response handling 1069 * done by the MACsec port was to a plaintext packet. 1070 * This violates the MACsec protocol standard. 1071 */ 1072 if (ether_addr_equal_64bits(hdr->h_dest, 1073 ndev->dev_addr)) { 1074 /* exact match, divert skb to this port */ 1075 skb->dev = ndev; 1076 skb->pkt_type = PACKET_HOST; 1077 ret = RX_HANDLER_ANOTHER; 1078 goto out; 1079 } else if (is_multicast_ether_addr_64bits( 1080 hdr->h_dest)) { 1081 /* multicast frame, deliver on this port too */ 1082 nskb = skb_clone(skb, GFP_ATOMIC); 1083 if (!nskb) 1084 break; 1085 1086 nskb->dev = ndev; 1087 eth_skb_pkt_type(nskb, ndev); 1088 1089 __netif_rx(nskb); 1090 } else if (ndev->flags & IFF_PROMISC) { 1091 skb->dev = ndev; 1092 skb->pkt_type = PACKET_HOST; 1093 ret = RX_HANDLER_ANOTHER; 1094 goto out; 1095 } 1096 1097 continue; 1098 } 1099 1100 /* 10.6 If the management control validateFrames is not 1101 * Strict, frames without a SecTAG are received, counted, and 1102 * delivered to the Controlled Port 1103 */ 1104 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1105 u64_stats_update_begin(&secy_stats->syncp); 1106 secy_stats->stats.InPktsNoTag++; 1107 u64_stats_update_end(&secy_stats->syncp); 1108 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1109 continue; 1110 } 1111 1112 /* deliver on this port */ 1113 nskb = skb_clone(skb, GFP_ATOMIC); 1114 if (!nskb) 1115 break; 1116 1117 nskb->dev = ndev; 1118 1119 if (__netif_rx(nskb) == NET_RX_SUCCESS) { 1120 u64_stats_update_begin(&secy_stats->syncp); 1121 secy_stats->stats.InPktsUntagged++; 1122 u64_stats_update_end(&secy_stats->syncp); 1123 } 1124 } 1125 1126 out: 1127 rcu_read_unlock(); 1128 return ret; 1129 } 1130 1131 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 1132 { 1133 struct sk_buff *skb = *pskb; 1134 struct net_device *dev = skb->dev; 1135 struct macsec_eth_header *hdr; 1136 struct macsec_secy *secy = NULL; 1137 struct macsec_rx_sc *rx_sc; 1138 struct macsec_rx_sa *rx_sa; 1139 struct macsec_rxh_data *rxd; 1140 struct macsec_dev *macsec; 1141 unsigned int len; 1142 sci_t sci = 0; 1143 u32 hdr_pn; 1144 bool cbit; 1145 struct pcpu_rx_sc_stats *rxsc_stats; 1146 struct pcpu_secy_stats *secy_stats; 1147 bool pulled_sci; 1148 int ret; 1149 1150 if (skb_headroom(skb) < ETH_HLEN) 1151 goto drop_direct; 1152 1153 hdr = macsec_ethhdr(skb); 1154 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) 1155 return handle_not_macsec(skb); 1156 1157 skb = skb_unshare(skb, GFP_ATOMIC); 1158 *pskb = skb; 1159 if (!skb) 1160 return RX_HANDLER_CONSUMED; 1161 1162 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1163 if (!pulled_sci) { 1164 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1165 goto drop_direct; 1166 } 1167 1168 hdr = macsec_ethhdr(skb); 1169 1170 /* Frames with a SecTAG that has the TCI E bit set but the C 1171 * bit clear are discarded, as this reserved encoding is used 1172 * to identify frames with a SecTAG that are not to be 1173 * delivered to the Controlled Port. 1174 */ 1175 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1176 return RX_HANDLER_PASS; 1177 1178 /* now, pull the extra length */ 1179 if (hdr->tci_an & MACSEC_TCI_SC) { 1180 if (!pulled_sci) 1181 goto drop_direct; 1182 } 1183 1184 /* ethernet header is part of crypto processing */ 1185 skb_push(skb, ETH_HLEN); 1186 1187 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1188 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1189 1190 rcu_read_lock(); 1191 rxd = macsec_data_rcu(skb->dev); 1192 1193 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci, rxd); 1194 if (!sci) 1195 goto drop_nosc; 1196 1197 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1198 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1199 1200 sc = sc ? macsec_rxsc_get(sc) : NULL; 1201 1202 if (sc) { 1203 secy = &macsec->secy; 1204 rx_sc = sc; 1205 break; 1206 } 1207 } 1208 1209 if (!secy) 1210 goto nosci; 1211 1212 dev = secy->netdev; 1213 macsec = macsec_priv(dev); 1214 secy_stats = this_cpu_ptr(macsec->stats); 1215 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1216 1217 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) { 1218 u64_stats_update_begin(&secy_stats->syncp); 1219 secy_stats->stats.InPktsBadTag++; 1220 u64_stats_update_end(&secy_stats->syncp); 1221 DEV_STATS_INC(secy->netdev, rx_errors); 1222 goto drop_nosa; 1223 } 1224 1225 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1226 if (!rx_sa) { 1227 /* 10.6.1 if the SA is not in use */ 1228 1229 /* If validateFrames is Strict or the C bit in the 1230 * SecTAG is set, discard 1231 */ 1232 if (hdr->tci_an & MACSEC_TCI_C || 1233 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1234 u64_stats_update_begin(&rxsc_stats->syncp); 1235 rxsc_stats->stats.InPktsNotUsingSA++; 1236 u64_stats_update_end(&rxsc_stats->syncp); 1237 DEV_STATS_INC(secy->netdev, rx_errors); 1238 goto drop_nosa; 1239 } 1240 1241 /* not Strict, the frame (with the SecTAG and ICV 1242 * removed) is delivered to the Controlled Port. 1243 */ 1244 u64_stats_update_begin(&rxsc_stats->syncp); 1245 rxsc_stats->stats.InPktsUnusedSA++; 1246 u64_stats_update_end(&rxsc_stats->syncp); 1247 goto deliver; 1248 } 1249 1250 /* First, PN check to avoid decrypting obviously wrong packets */ 1251 hdr_pn = ntohl(hdr->packet_number); 1252 if (secy->replay_protect) { 1253 bool late; 1254 1255 spin_lock(&rx_sa->lock); 1256 late = rx_sa->next_pn_halves.lower >= secy->replay_window && 1257 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window); 1258 1259 if (secy->xpn) 1260 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn); 1261 spin_unlock(&rx_sa->lock); 1262 1263 if (late) { 1264 u64_stats_update_begin(&rxsc_stats->syncp); 1265 rxsc_stats->stats.InPktsLate++; 1266 u64_stats_update_end(&rxsc_stats->syncp); 1267 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1268 goto drop; 1269 } 1270 } 1271 1272 macsec_skb_cb(skb)->rx_sa = rx_sa; 1273 1274 /* Disabled && !changed text => skip validation */ 1275 if (hdr->tci_an & MACSEC_TCI_C || 1276 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1277 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1278 1279 if (IS_ERR(skb)) { 1280 /* the decrypt callback needs the reference */ 1281 if (PTR_ERR(skb) != -EINPROGRESS) { 1282 macsec_rxsa_put(rx_sa); 1283 macsec_rxsc_put(rx_sc); 1284 } 1285 rcu_read_unlock(); 1286 *pskb = NULL; 1287 return RX_HANDLER_CONSUMED; 1288 } 1289 1290 if (!macsec_post_decrypt(skb, secy, hdr_pn)) 1291 goto drop; 1292 1293 deliver: 1294 macsec_finalize_skb(skb, secy->icv_len, 1295 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1296 len = skb->len; 1297 macsec_reset_skb(skb, secy->netdev); 1298 1299 if (rx_sa) 1300 macsec_rxsa_put(rx_sa); 1301 macsec_rxsc_put(rx_sc); 1302 1303 skb_orphan(skb); 1304 ret = gro_cells_receive(&macsec->gro_cells, skb); 1305 if (ret == NET_RX_SUCCESS) 1306 count_rx(dev, len); 1307 else 1308 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1309 1310 rcu_read_unlock(); 1311 1312 *pskb = NULL; 1313 return RX_HANDLER_CONSUMED; 1314 1315 drop: 1316 macsec_rxsa_put(rx_sa); 1317 drop_nosa: 1318 macsec_rxsc_put(rx_sc); 1319 drop_nosc: 1320 rcu_read_unlock(); 1321 drop_direct: 1322 kfree_skb(skb); 1323 *pskb = NULL; 1324 return RX_HANDLER_CONSUMED; 1325 1326 nosci: 1327 /* 10.6.1 if the SC is not found */ 1328 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1329 if (!cbit) 1330 macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN, 1331 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1332 1333 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1334 struct sk_buff *nskb; 1335 1336 secy_stats = this_cpu_ptr(macsec->stats); 1337 1338 /* If validateFrames is Strict or the C bit in the 1339 * SecTAG is set, discard 1340 */ 1341 if (cbit || 1342 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1343 u64_stats_update_begin(&secy_stats->syncp); 1344 secy_stats->stats.InPktsNoSCI++; 1345 u64_stats_update_end(&secy_stats->syncp); 1346 DEV_STATS_INC(macsec->secy.netdev, rx_errors); 1347 continue; 1348 } 1349 1350 /* not strict, the frame (with the SecTAG and ICV 1351 * removed) is delivered to the Controlled Port. 1352 */ 1353 nskb = skb_clone(skb, GFP_ATOMIC); 1354 if (!nskb) 1355 break; 1356 1357 macsec_reset_skb(nskb, macsec->secy.netdev); 1358 1359 ret = __netif_rx(nskb); 1360 if (ret == NET_RX_SUCCESS) { 1361 u64_stats_update_begin(&secy_stats->syncp); 1362 secy_stats->stats.InPktsUnknownSCI++; 1363 u64_stats_update_end(&secy_stats->syncp); 1364 } else { 1365 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1366 } 1367 } 1368 1369 rcu_read_unlock(); 1370 *pskb = skb; 1371 return RX_HANDLER_PASS; 1372 } 1373 1374 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1375 { 1376 struct crypto_aead *tfm; 1377 int ret; 1378 1379 tfm = crypto_alloc_aead("gcm(aes)", 0, 0); 1380 1381 if (IS_ERR(tfm)) 1382 return tfm; 1383 1384 ret = crypto_aead_setkey(tfm, key, key_len); 1385 if (ret < 0) 1386 goto fail; 1387 1388 ret = crypto_aead_setauthsize(tfm, icv_len); 1389 if (ret < 0) 1390 goto fail; 1391 1392 return tfm; 1393 fail: 1394 crypto_free_aead(tfm); 1395 return ERR_PTR(ret); 1396 } 1397 1398 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1399 int icv_len) 1400 { 1401 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1402 if (!rx_sa->stats) 1403 return -ENOMEM; 1404 1405 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1406 if (IS_ERR(rx_sa->key.tfm)) { 1407 free_percpu(rx_sa->stats); 1408 return PTR_ERR(rx_sa->key.tfm); 1409 } 1410 1411 rx_sa->ssci = MACSEC_UNDEF_SSCI; 1412 rx_sa->active = false; 1413 rx_sa->next_pn = 1; 1414 refcount_set(&rx_sa->refcnt, 1); 1415 spin_lock_init(&rx_sa->lock); 1416 INIT_RCU_WORK(&rx_sa->destroy_work, free_rxsa_work); 1417 1418 return 0; 1419 } 1420 1421 static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1422 { 1423 rx_sa->active = false; 1424 1425 macsec_rxsa_put(rx_sa); 1426 } 1427 1428 static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1429 { 1430 int i; 1431 1432 for (i = 0; i < MACSEC_NUM_AN; i++) { 1433 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1434 1435 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1436 if (sa) 1437 clear_rx_sa(sa); 1438 } 1439 1440 macsec_rxsc_put(rx_sc); 1441 } 1442 1443 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1444 { 1445 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1446 1447 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1448 rx_sc; 1449 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1450 if (rx_sc->sci == sci) { 1451 if (rx_sc->active) 1452 secy->n_rx_sc--; 1453 rcu_assign_pointer(*rx_scp, rx_sc->next); 1454 return rx_sc; 1455 } 1456 } 1457 1458 return NULL; 1459 } 1460 1461 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci, 1462 bool active) 1463 { 1464 struct macsec_rx_sc *rx_sc; 1465 struct macsec_dev *macsec; 1466 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1467 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1468 struct macsec_secy *secy; 1469 1470 list_for_each_entry(macsec, &rxd->secys, secys) { 1471 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1472 return ERR_PTR(-EEXIST); 1473 } 1474 1475 rx_sc = kzalloc_obj(*rx_sc); 1476 if (!rx_sc) 1477 return ERR_PTR(-ENOMEM); 1478 1479 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1480 if (!rx_sc->stats) { 1481 kfree(rx_sc); 1482 return ERR_PTR(-ENOMEM); 1483 } 1484 1485 rx_sc->sci = sci; 1486 rx_sc->active = active; 1487 refcount_set(&rx_sc->refcnt, 1); 1488 1489 secy = &macsec_priv(dev)->secy; 1490 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1491 rcu_assign_pointer(secy->rx_sc, rx_sc); 1492 1493 if (rx_sc->active) 1494 secy->n_rx_sc++; 1495 1496 return rx_sc; 1497 } 1498 1499 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1500 int icv_len) 1501 { 1502 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1503 if (!tx_sa->stats) 1504 return -ENOMEM; 1505 1506 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1507 if (IS_ERR(tx_sa->key.tfm)) { 1508 free_percpu(tx_sa->stats); 1509 return PTR_ERR(tx_sa->key.tfm); 1510 } 1511 1512 tx_sa->ssci = MACSEC_UNDEF_SSCI; 1513 tx_sa->active = false; 1514 refcount_set(&tx_sa->refcnt, 1); 1515 spin_lock_init(&tx_sa->lock); 1516 INIT_RCU_WORK(&tx_sa->destroy_work, free_txsa_work); 1517 1518 return 0; 1519 } 1520 1521 static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1522 { 1523 tx_sa->active = false; 1524 1525 macsec_txsa_put(tx_sa); 1526 } 1527 1528 static struct genl_family macsec_fam; 1529 1530 static struct net_device *get_dev_from_nl(struct net *net, 1531 struct nlattr **attrs) 1532 { 1533 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1534 struct net_device *dev; 1535 1536 dev = __dev_get_by_index(net, ifindex); 1537 if (!dev) 1538 return ERR_PTR(-ENODEV); 1539 1540 if (!netif_is_macsec(dev)) 1541 return ERR_PTR(-ENODEV); 1542 1543 return dev; 1544 } 1545 1546 static enum macsec_offload nla_get_offload(const struct nlattr *nla) 1547 { 1548 return (__force enum macsec_offload)nla_get_u8(nla); 1549 } 1550 1551 static sci_t nla_get_sci(const struct nlattr *nla) 1552 { 1553 return (__force sci_t)nla_get_u64(nla); 1554 } 1555 1556 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, 1557 int padattr) 1558 { 1559 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); 1560 } 1561 1562 static ssci_t nla_get_ssci(const struct nlattr *nla) 1563 { 1564 return (__force ssci_t)nla_get_u32(nla); 1565 } 1566 1567 static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value) 1568 { 1569 return nla_put_u32(skb, attrtype, (__force u64)value); 1570 } 1571 1572 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1573 struct nlattr **attrs, 1574 struct nlattr **tb_sa, 1575 struct net_device **devp, 1576 struct macsec_secy **secyp, 1577 struct macsec_tx_sc **scp, 1578 u8 *assoc_num) 1579 { 1580 struct net_device *dev; 1581 struct macsec_secy *secy; 1582 struct macsec_tx_sc *tx_sc; 1583 struct macsec_tx_sa *tx_sa; 1584 1585 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1586 return ERR_PTR(-EINVAL); 1587 1588 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1589 1590 dev = get_dev_from_nl(net, attrs); 1591 if (IS_ERR(dev)) 1592 return ERR_CAST(dev); 1593 1594 secy = &macsec_priv(dev)->secy; 1595 tx_sc = &secy->tx_sc; 1596 1597 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1598 if (!tx_sa) 1599 return ERR_PTR(-ENODEV); 1600 1601 *devp = dev; 1602 *scp = tx_sc; 1603 *secyp = secy; 1604 return tx_sa; 1605 } 1606 1607 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1608 struct nlattr **attrs, 1609 struct nlattr **tb_rxsc, 1610 struct net_device **devp, 1611 struct macsec_secy **secyp) 1612 { 1613 struct net_device *dev; 1614 struct macsec_secy *secy; 1615 struct macsec_rx_sc *rx_sc; 1616 sci_t sci; 1617 1618 dev = get_dev_from_nl(net, attrs); 1619 if (IS_ERR(dev)) 1620 return ERR_CAST(dev); 1621 1622 secy = &macsec_priv(dev)->secy; 1623 1624 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1625 return ERR_PTR(-EINVAL); 1626 1627 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1628 rx_sc = find_rx_sc_rtnl(secy, sci); 1629 if (!rx_sc) 1630 return ERR_PTR(-ENODEV); 1631 1632 *secyp = secy; 1633 *devp = dev; 1634 1635 return rx_sc; 1636 } 1637 1638 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1639 struct nlattr **attrs, 1640 struct nlattr **tb_rxsc, 1641 struct nlattr **tb_sa, 1642 struct net_device **devp, 1643 struct macsec_secy **secyp, 1644 struct macsec_rx_sc **scp, 1645 u8 *assoc_num) 1646 { 1647 struct macsec_rx_sc *rx_sc; 1648 struct macsec_rx_sa *rx_sa; 1649 1650 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1651 return ERR_PTR(-EINVAL); 1652 1653 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1654 1655 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1656 if (IS_ERR(rx_sc)) 1657 return ERR_CAST(rx_sc); 1658 1659 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1660 if (!rx_sa) 1661 return ERR_PTR(-ENODEV); 1662 1663 *scp = rx_sc; 1664 return rx_sa; 1665 } 1666 1667 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1668 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1669 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1670 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1671 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED }, 1672 }; 1673 1674 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1675 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1676 [MACSEC_RXSC_ATTR_ACTIVE] = NLA_POLICY_MAX(NLA_U8, 1), 1677 }; 1678 1679 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1680 [MACSEC_SA_ATTR_AN] = NLA_POLICY_MAX(NLA_U8, MACSEC_NUM_AN - 1), 1681 [MACSEC_SA_ATTR_ACTIVE] = NLA_POLICY_MAX(NLA_U8, 1), 1682 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN(NLA_UINT, 1), 1683 [MACSEC_SA_ATTR_KEYID] = NLA_POLICY_EXACT_LEN(MACSEC_KEYID_LEN), 1684 [MACSEC_SA_ATTR_KEY] = NLA_POLICY_MAX_LEN(MACSEC_MAX_KEY_LEN), 1685 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 }, 1686 [MACSEC_SA_ATTR_SALT] = NLA_POLICY_EXACT_LEN(MACSEC_SALT_LEN), 1687 }; 1688 1689 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = { 1690 [MACSEC_OFFLOAD_ATTR_TYPE] = NLA_POLICY_MAX(NLA_U8, MACSEC_OFFLOAD_MAX), 1691 }; 1692 1693 /* Offloads an operation to a device driver */ 1694 static int macsec_offload(int (* const func)(struct macsec_context *), 1695 struct macsec_context *ctx) 1696 { 1697 int ret; 1698 1699 if (unlikely(!func)) 1700 return 0; 1701 1702 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1703 mutex_lock(&ctx->phydev->lock); 1704 1705 ret = (*func)(ctx); 1706 1707 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1708 mutex_unlock(&ctx->phydev->lock); 1709 1710 return ret; 1711 } 1712 1713 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1714 { 1715 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1716 return -EINVAL; 1717 1718 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL)) 1719 return -EINVAL; 1720 1721 return 0; 1722 } 1723 1724 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1725 { 1726 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1727 return -EINVAL; 1728 1729 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL)) 1730 return -EINVAL; 1731 1732 return 0; 1733 } 1734 1735 static bool validate_add_rxsa(struct nlattr **attrs) 1736 { 1737 if (!attrs[MACSEC_SA_ATTR_AN] || 1738 !attrs[MACSEC_SA_ATTR_KEY] || 1739 !attrs[MACSEC_SA_ATTR_KEYID]) 1740 return false; 1741 1742 return true; 1743 } 1744 1745 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1746 { 1747 struct net_device *dev; 1748 struct nlattr **attrs = info->attrs; 1749 struct macsec_secy *secy; 1750 struct macsec_rx_sc *rx_sc; 1751 struct macsec_rx_sa *rx_sa; 1752 unsigned char assoc_num; 1753 int pn_len; 1754 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1755 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1756 int err; 1757 1758 if (!attrs[MACSEC_ATTR_IFINDEX]) 1759 return -EINVAL; 1760 1761 if (parse_sa_config(attrs, tb_sa)) 1762 return -EINVAL; 1763 1764 if (parse_rxsc_config(attrs, tb_rxsc)) 1765 return -EINVAL; 1766 1767 if (!validate_add_rxsa(tb_sa)) 1768 return -EINVAL; 1769 1770 rtnl_lock(); 1771 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1772 if (IS_ERR(rx_sc)) { 1773 rtnl_unlock(); 1774 return PTR_ERR(rx_sc); 1775 } 1776 1777 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1778 1779 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1780 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1781 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1782 rtnl_unlock(); 1783 return -EINVAL; 1784 } 1785 1786 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1787 if (tb_sa[MACSEC_SA_ATTR_PN] && 1788 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1789 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n", 1790 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1791 rtnl_unlock(); 1792 return -EINVAL; 1793 } 1794 1795 if (secy->xpn) { 1796 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 1797 rtnl_unlock(); 1798 return -EINVAL; 1799 } 1800 } 1801 1802 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1803 if (rx_sa) { 1804 rtnl_unlock(); 1805 return -EBUSY; 1806 } 1807 1808 rx_sa = kmalloc_obj(*rx_sa); 1809 if (!rx_sa) { 1810 rtnl_unlock(); 1811 return -ENOMEM; 1812 } 1813 1814 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1815 secy->key_len, secy->icv_len); 1816 if (err < 0) { 1817 kfree(rx_sa); 1818 rtnl_unlock(); 1819 return err; 1820 } 1821 1822 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1823 spin_lock_bh(&rx_sa->lock); 1824 rx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]); 1825 spin_unlock_bh(&rx_sa->lock); 1826 } 1827 1828 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1829 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1830 1831 rx_sa->sc = rx_sc; 1832 1833 if (secy->xpn) { 1834 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 1835 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 1836 MACSEC_SALT_LEN); 1837 } 1838 1839 /* If h/w offloading is available, propagate to the device */ 1840 if (macsec_is_offloaded(netdev_priv(dev))) { 1841 const struct macsec_ops *ops; 1842 struct macsec_context ctx; 1843 1844 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1845 if (!ops) { 1846 err = -EOPNOTSUPP; 1847 goto cleanup; 1848 } 1849 1850 ctx.sa.assoc_num = assoc_num; 1851 ctx.sa.rx_sa = rx_sa; 1852 ctx.secy = secy; 1853 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1854 secy->key_len); 1855 1856 err = macsec_offload(ops->mdo_add_rxsa, &ctx); 1857 memzero_explicit(ctx.sa.key, secy->key_len); 1858 if (err) 1859 goto cleanup; 1860 } 1861 1862 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1863 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1864 1865 rtnl_unlock(); 1866 1867 return 0; 1868 1869 cleanup: 1870 macsec_rxsa_put(rx_sa); 1871 rtnl_unlock(); 1872 return err; 1873 } 1874 1875 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1876 { 1877 struct net_device *dev; 1878 sci_t sci = MACSEC_UNDEF_SCI; 1879 struct nlattr **attrs = info->attrs; 1880 struct macsec_rx_sc *rx_sc; 1881 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1882 struct macsec_secy *secy; 1883 bool active = true; 1884 int ret; 1885 1886 if (!attrs[MACSEC_ATTR_IFINDEX]) 1887 return -EINVAL; 1888 1889 if (parse_rxsc_config(attrs, tb_rxsc)) 1890 return -EINVAL; 1891 1892 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1893 return -EINVAL; 1894 1895 rtnl_lock(); 1896 dev = get_dev_from_nl(genl_info_net(info), attrs); 1897 if (IS_ERR(dev)) { 1898 rtnl_unlock(); 1899 return PTR_ERR(dev); 1900 } 1901 1902 secy = &macsec_priv(dev)->secy; 1903 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1904 1905 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1906 active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1907 1908 rx_sc = create_rx_sc(dev, sci, active); 1909 if (IS_ERR(rx_sc)) { 1910 rtnl_unlock(); 1911 return PTR_ERR(rx_sc); 1912 } 1913 1914 if (macsec_is_offloaded(netdev_priv(dev))) { 1915 const struct macsec_ops *ops; 1916 struct macsec_context ctx; 1917 1918 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1919 if (!ops) { 1920 ret = -EOPNOTSUPP; 1921 goto cleanup; 1922 } 1923 1924 ctx.rx_sc = rx_sc; 1925 ctx.secy = secy; 1926 1927 ret = macsec_offload(ops->mdo_add_rxsc, &ctx); 1928 if (ret) 1929 goto cleanup; 1930 } 1931 1932 rtnl_unlock(); 1933 1934 return 0; 1935 1936 cleanup: 1937 del_rx_sc(secy, sci); 1938 free_rx_sc(rx_sc); 1939 rtnl_unlock(); 1940 return ret; 1941 } 1942 1943 static bool validate_add_txsa(struct nlattr **attrs) 1944 { 1945 if (!attrs[MACSEC_SA_ATTR_AN] || 1946 !attrs[MACSEC_SA_ATTR_PN] || 1947 !attrs[MACSEC_SA_ATTR_KEY] || 1948 !attrs[MACSEC_SA_ATTR_KEYID]) 1949 return false; 1950 1951 return true; 1952 } 1953 1954 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1955 { 1956 struct net_device *dev; 1957 struct nlattr **attrs = info->attrs; 1958 struct macsec_secy *secy; 1959 struct macsec_tx_sc *tx_sc; 1960 struct macsec_tx_sa *tx_sa; 1961 unsigned char assoc_num; 1962 int pn_len; 1963 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1964 bool was_operational; 1965 int err; 1966 1967 if (!attrs[MACSEC_ATTR_IFINDEX]) 1968 return -EINVAL; 1969 1970 if (parse_sa_config(attrs, tb_sa)) 1971 return -EINVAL; 1972 1973 if (!validate_add_txsa(tb_sa)) 1974 return -EINVAL; 1975 1976 rtnl_lock(); 1977 dev = get_dev_from_nl(genl_info_net(info), attrs); 1978 if (IS_ERR(dev)) { 1979 rtnl_unlock(); 1980 return PTR_ERR(dev); 1981 } 1982 1983 secy = &macsec_priv(dev)->secy; 1984 tx_sc = &secy->tx_sc; 1985 1986 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1987 1988 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1989 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 1990 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1991 rtnl_unlock(); 1992 return -EINVAL; 1993 } 1994 1995 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1996 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1997 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n", 1998 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1999 rtnl_unlock(); 2000 return -EINVAL; 2001 } 2002 2003 if (secy->xpn) { 2004 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 2005 rtnl_unlock(); 2006 return -EINVAL; 2007 } 2008 } 2009 2010 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 2011 if (tx_sa) { 2012 rtnl_unlock(); 2013 return -EBUSY; 2014 } 2015 2016 tx_sa = kmalloc_obj(*tx_sa); 2017 if (!tx_sa) { 2018 rtnl_unlock(); 2019 return -ENOMEM; 2020 } 2021 2022 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2023 secy->key_len, secy->icv_len); 2024 if (err < 0) { 2025 kfree(tx_sa); 2026 rtnl_unlock(); 2027 return err; 2028 } 2029 2030 spin_lock_bh(&tx_sa->lock); 2031 tx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]); 2032 spin_unlock_bh(&tx_sa->lock); 2033 2034 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2035 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2036 2037 was_operational = secy->operational; 2038 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 2039 secy->operational = true; 2040 2041 if (secy->xpn) { 2042 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 2043 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 2044 MACSEC_SALT_LEN); 2045 } 2046 2047 /* If h/w offloading is available, propagate to the device */ 2048 if (macsec_is_offloaded(netdev_priv(dev))) { 2049 const struct macsec_ops *ops; 2050 struct macsec_context ctx; 2051 2052 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2053 if (!ops) { 2054 err = -EOPNOTSUPP; 2055 goto cleanup; 2056 } 2057 2058 ctx.sa.assoc_num = assoc_num; 2059 ctx.sa.tx_sa = tx_sa; 2060 ctx.secy = secy; 2061 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2062 secy->key_len); 2063 2064 err = macsec_offload(ops->mdo_add_txsa, &ctx); 2065 memzero_explicit(ctx.sa.key, secy->key_len); 2066 if (err) 2067 goto cleanup; 2068 } 2069 2070 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 2071 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 2072 2073 rtnl_unlock(); 2074 2075 return 0; 2076 2077 cleanup: 2078 secy->operational = was_operational; 2079 macsec_txsa_put(tx_sa); 2080 rtnl_unlock(); 2081 return err; 2082 } 2083 2084 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 2085 { 2086 struct nlattr **attrs = info->attrs; 2087 struct net_device *dev; 2088 struct macsec_secy *secy; 2089 struct macsec_rx_sc *rx_sc; 2090 struct macsec_rx_sa *rx_sa; 2091 u8 assoc_num; 2092 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2093 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2094 int ret; 2095 2096 if (!attrs[MACSEC_ATTR_IFINDEX]) 2097 return -EINVAL; 2098 2099 if (parse_sa_config(attrs, tb_sa)) 2100 return -EINVAL; 2101 2102 if (parse_rxsc_config(attrs, tb_rxsc)) 2103 return -EINVAL; 2104 2105 rtnl_lock(); 2106 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2107 &dev, &secy, &rx_sc, &assoc_num); 2108 if (IS_ERR(rx_sa)) { 2109 rtnl_unlock(); 2110 return PTR_ERR(rx_sa); 2111 } 2112 2113 if (rx_sa->active) { 2114 rtnl_unlock(); 2115 return -EBUSY; 2116 } 2117 2118 /* If h/w offloading is available, propagate to the device */ 2119 if (macsec_is_offloaded(netdev_priv(dev))) { 2120 const struct macsec_ops *ops; 2121 struct macsec_context ctx; 2122 2123 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2124 if (!ops) { 2125 ret = -EOPNOTSUPP; 2126 goto cleanup; 2127 } 2128 2129 ctx.sa.assoc_num = assoc_num; 2130 ctx.sa.rx_sa = rx_sa; 2131 ctx.secy = secy; 2132 2133 ret = macsec_offload(ops->mdo_del_rxsa, &ctx); 2134 if (ret) 2135 goto cleanup; 2136 } 2137 2138 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 2139 clear_rx_sa(rx_sa); 2140 2141 rtnl_unlock(); 2142 2143 return 0; 2144 2145 cleanup: 2146 rtnl_unlock(); 2147 return ret; 2148 } 2149 2150 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 2151 { 2152 struct nlattr **attrs = info->attrs; 2153 struct net_device *dev; 2154 struct macsec_secy *secy; 2155 struct macsec_rx_sc *rx_sc; 2156 sci_t sci; 2157 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2158 int ret; 2159 2160 if (!attrs[MACSEC_ATTR_IFINDEX]) 2161 return -EINVAL; 2162 2163 if (parse_rxsc_config(attrs, tb_rxsc)) 2164 return -EINVAL; 2165 2166 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 2167 return -EINVAL; 2168 2169 rtnl_lock(); 2170 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 2171 if (IS_ERR(dev)) { 2172 rtnl_unlock(); 2173 return PTR_ERR(dev); 2174 } 2175 2176 secy = &macsec_priv(dev)->secy; 2177 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 2178 2179 rx_sc = del_rx_sc(secy, sci); 2180 if (!rx_sc) { 2181 rtnl_unlock(); 2182 return -ENODEV; 2183 } 2184 2185 /* If h/w offloading is available, propagate to the device */ 2186 if (macsec_is_offloaded(netdev_priv(dev))) { 2187 const struct macsec_ops *ops; 2188 struct macsec_context ctx; 2189 2190 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2191 if (!ops) { 2192 ret = -EOPNOTSUPP; 2193 goto cleanup; 2194 } 2195 2196 ctx.rx_sc = rx_sc; 2197 ctx.secy = secy; 2198 ret = macsec_offload(ops->mdo_del_rxsc, &ctx); 2199 if (ret) 2200 goto cleanup; 2201 } 2202 2203 free_rx_sc(rx_sc); 2204 rtnl_unlock(); 2205 2206 return 0; 2207 2208 cleanup: 2209 rtnl_unlock(); 2210 return ret; 2211 } 2212 2213 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 2214 { 2215 struct nlattr **attrs = info->attrs; 2216 struct net_device *dev; 2217 struct macsec_secy *secy; 2218 struct macsec_tx_sc *tx_sc; 2219 struct macsec_tx_sa *tx_sa; 2220 u8 assoc_num; 2221 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2222 int ret; 2223 2224 if (!attrs[MACSEC_ATTR_IFINDEX]) 2225 return -EINVAL; 2226 2227 if (parse_sa_config(attrs, tb_sa)) 2228 return -EINVAL; 2229 2230 rtnl_lock(); 2231 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2232 &dev, &secy, &tx_sc, &assoc_num); 2233 if (IS_ERR(tx_sa)) { 2234 rtnl_unlock(); 2235 return PTR_ERR(tx_sa); 2236 } 2237 2238 if (tx_sa->active) { 2239 rtnl_unlock(); 2240 return -EBUSY; 2241 } 2242 2243 /* If h/w offloading is available, propagate to the device */ 2244 if (macsec_is_offloaded(netdev_priv(dev))) { 2245 const struct macsec_ops *ops; 2246 struct macsec_context ctx; 2247 2248 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2249 if (!ops) { 2250 ret = -EOPNOTSUPP; 2251 goto cleanup; 2252 } 2253 2254 ctx.sa.assoc_num = assoc_num; 2255 ctx.sa.tx_sa = tx_sa; 2256 ctx.secy = secy; 2257 2258 ret = macsec_offload(ops->mdo_del_txsa, &ctx); 2259 if (ret) 2260 goto cleanup; 2261 } 2262 2263 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 2264 clear_tx_sa(tx_sa); 2265 2266 rtnl_unlock(); 2267 2268 return 0; 2269 2270 cleanup: 2271 rtnl_unlock(); 2272 return ret; 2273 } 2274 2275 static bool validate_upd_sa(struct nlattr **attrs) 2276 { 2277 if (!attrs[MACSEC_SA_ATTR_AN] || 2278 attrs[MACSEC_SA_ATTR_KEY] || 2279 attrs[MACSEC_SA_ATTR_KEYID] || 2280 attrs[MACSEC_SA_ATTR_SSCI] || 2281 attrs[MACSEC_SA_ATTR_SALT]) 2282 return false; 2283 2284 return true; 2285 } 2286 2287 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2288 { 2289 struct nlattr **attrs = info->attrs; 2290 struct net_device *dev; 2291 struct macsec_secy *secy; 2292 struct macsec_tx_sc *tx_sc; 2293 struct macsec_tx_sa *tx_sa; 2294 u8 assoc_num; 2295 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2296 bool was_operational, was_active; 2297 pn_t prev_pn; 2298 int ret = 0; 2299 2300 prev_pn.full64 = 0; 2301 2302 if (!attrs[MACSEC_ATTR_IFINDEX]) 2303 return -EINVAL; 2304 2305 if (parse_sa_config(attrs, tb_sa)) 2306 return -EINVAL; 2307 2308 if (!validate_upd_sa(tb_sa)) 2309 return -EINVAL; 2310 2311 rtnl_lock(); 2312 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2313 &dev, &secy, &tx_sc, &assoc_num); 2314 if (IS_ERR(tx_sa)) { 2315 rtnl_unlock(); 2316 return PTR_ERR(tx_sa); 2317 } 2318 2319 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2320 int pn_len; 2321 2322 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2323 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2324 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n", 2325 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2326 rtnl_unlock(); 2327 return -EINVAL; 2328 } 2329 2330 spin_lock_bh(&tx_sa->lock); 2331 prev_pn = tx_sa->next_pn_halves; 2332 tx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]); 2333 spin_unlock_bh(&tx_sa->lock); 2334 } 2335 2336 was_active = tx_sa->active; 2337 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2338 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2339 2340 was_operational = secy->operational; 2341 if (assoc_num == tx_sc->encoding_sa) 2342 secy->operational = tx_sa->active; 2343 2344 /* If h/w offloading is available, propagate to the device */ 2345 if (macsec_is_offloaded(netdev_priv(dev))) { 2346 const struct macsec_ops *ops; 2347 struct macsec_context ctx; 2348 2349 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2350 if (!ops) { 2351 ret = -EOPNOTSUPP; 2352 goto cleanup; 2353 } 2354 2355 ctx.sa.assoc_num = assoc_num; 2356 ctx.sa.tx_sa = tx_sa; 2357 ctx.sa.update_pn = !!prev_pn.full64; 2358 ctx.secy = secy; 2359 2360 ret = macsec_offload(ops->mdo_upd_txsa, &ctx); 2361 if (ret) 2362 goto cleanup; 2363 } 2364 2365 rtnl_unlock(); 2366 2367 return 0; 2368 2369 cleanup: 2370 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2371 spin_lock_bh(&tx_sa->lock); 2372 tx_sa->next_pn_halves = prev_pn; 2373 spin_unlock_bh(&tx_sa->lock); 2374 } 2375 tx_sa->active = was_active; 2376 secy->operational = was_operational; 2377 rtnl_unlock(); 2378 return ret; 2379 } 2380 2381 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2382 { 2383 struct nlattr **attrs = info->attrs; 2384 struct net_device *dev; 2385 struct macsec_secy *secy; 2386 struct macsec_rx_sc *rx_sc; 2387 struct macsec_rx_sa *rx_sa; 2388 u8 assoc_num; 2389 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2390 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2391 bool was_active; 2392 pn_t prev_pn; 2393 int ret = 0; 2394 2395 prev_pn.full64 = 0; 2396 2397 if (!attrs[MACSEC_ATTR_IFINDEX]) 2398 return -EINVAL; 2399 2400 if (parse_rxsc_config(attrs, tb_rxsc)) 2401 return -EINVAL; 2402 2403 if (parse_sa_config(attrs, tb_sa)) 2404 return -EINVAL; 2405 2406 if (!validate_upd_sa(tb_sa)) 2407 return -EINVAL; 2408 2409 rtnl_lock(); 2410 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2411 &dev, &secy, &rx_sc, &assoc_num); 2412 if (IS_ERR(rx_sa)) { 2413 rtnl_unlock(); 2414 return PTR_ERR(rx_sa); 2415 } 2416 2417 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2418 int pn_len; 2419 2420 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2421 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2422 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n", 2423 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2424 rtnl_unlock(); 2425 return -EINVAL; 2426 } 2427 2428 spin_lock_bh(&rx_sa->lock); 2429 prev_pn = rx_sa->next_pn_halves; 2430 rx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]); 2431 spin_unlock_bh(&rx_sa->lock); 2432 } 2433 2434 was_active = rx_sa->active; 2435 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2436 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2437 2438 /* If h/w offloading is available, propagate to the device */ 2439 if (macsec_is_offloaded(netdev_priv(dev))) { 2440 const struct macsec_ops *ops; 2441 struct macsec_context ctx; 2442 2443 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2444 if (!ops) { 2445 ret = -EOPNOTSUPP; 2446 goto cleanup; 2447 } 2448 2449 ctx.sa.assoc_num = assoc_num; 2450 ctx.sa.rx_sa = rx_sa; 2451 ctx.sa.update_pn = !!prev_pn.full64; 2452 ctx.secy = secy; 2453 2454 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx); 2455 if (ret) 2456 goto cleanup; 2457 } 2458 2459 rtnl_unlock(); 2460 return 0; 2461 2462 cleanup: 2463 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2464 spin_lock_bh(&rx_sa->lock); 2465 rx_sa->next_pn_halves = prev_pn; 2466 spin_unlock_bh(&rx_sa->lock); 2467 } 2468 rx_sa->active = was_active; 2469 rtnl_unlock(); 2470 return ret; 2471 } 2472 2473 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2474 { 2475 struct nlattr **attrs = info->attrs; 2476 struct net_device *dev; 2477 struct macsec_secy *secy; 2478 struct macsec_rx_sc *rx_sc; 2479 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2480 unsigned int prev_n_rx_sc; 2481 bool was_active; 2482 int ret; 2483 2484 if (!attrs[MACSEC_ATTR_IFINDEX]) 2485 return -EINVAL; 2486 2487 if (parse_rxsc_config(attrs, tb_rxsc)) 2488 return -EINVAL; 2489 2490 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 2491 return -EINVAL; 2492 2493 rtnl_lock(); 2494 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2495 if (IS_ERR(rx_sc)) { 2496 rtnl_unlock(); 2497 return PTR_ERR(rx_sc); 2498 } 2499 2500 was_active = rx_sc->active; 2501 prev_n_rx_sc = secy->n_rx_sc; 2502 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2503 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2504 2505 if (rx_sc->active != new) 2506 secy->n_rx_sc += new ? 1 : -1; 2507 2508 rx_sc->active = new; 2509 } 2510 2511 /* If h/w offloading is available, propagate to the device */ 2512 if (macsec_is_offloaded(netdev_priv(dev))) { 2513 const struct macsec_ops *ops; 2514 struct macsec_context ctx; 2515 2516 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2517 if (!ops) { 2518 ret = -EOPNOTSUPP; 2519 goto cleanup; 2520 } 2521 2522 ctx.rx_sc = rx_sc; 2523 ctx.secy = secy; 2524 2525 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx); 2526 if (ret) 2527 goto cleanup; 2528 } 2529 2530 rtnl_unlock(); 2531 2532 return 0; 2533 2534 cleanup: 2535 secy->n_rx_sc = prev_n_rx_sc; 2536 rx_sc->active = was_active; 2537 rtnl_unlock(); 2538 return ret; 2539 } 2540 2541 static bool macsec_is_configured(struct macsec_dev *macsec) 2542 { 2543 struct macsec_secy *secy = &macsec->secy; 2544 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2545 int i; 2546 2547 if (secy->rx_sc) 2548 return true; 2549 2550 for (i = 0; i < MACSEC_NUM_AN; i++) 2551 if (tx_sc->sa[i]) 2552 return true; 2553 2554 return false; 2555 } 2556 2557 static bool macsec_needs_tx_tag(struct macsec_dev *macsec, 2558 const struct macsec_ops *ops) 2559 { 2560 return macsec->offload == MACSEC_OFFLOAD_PHY && 2561 ops->mdo_insert_tx_tag; 2562 } 2563 2564 static void macsec_set_head_tail_room(struct net_device *dev) 2565 { 2566 struct macsec_dev *macsec = macsec_priv(dev); 2567 struct net_device *real_dev = macsec->real_dev; 2568 int needed_headroom, needed_tailroom; 2569 const struct macsec_ops *ops; 2570 2571 ops = macsec_get_ops(macsec, NULL); 2572 if (ops) { 2573 needed_headroom = ops->needed_headroom; 2574 needed_tailroom = ops->needed_tailroom; 2575 } else { 2576 needed_headroom = MACSEC_NEEDED_HEADROOM; 2577 needed_tailroom = MACSEC_NEEDED_TAILROOM; 2578 } 2579 2580 dev->needed_headroom = real_dev->needed_headroom + needed_headroom; 2581 dev->needed_tailroom = real_dev->needed_tailroom + needed_tailroom; 2582 } 2583 2584 static void macsec_inherit_tso_max(struct net_device *dev) 2585 { 2586 struct macsec_dev *macsec = macsec_priv(dev); 2587 2588 /* if macsec is offloaded, we need to follow the lower 2589 * device's capabilities. otherwise, we can ignore them. 2590 */ 2591 if (macsec_is_offloaded(macsec)) 2592 netif_inherit_tso_max(dev, macsec->real_dev); 2593 } 2594 2595 static int macsec_update_offload(struct net_device *dev, 2596 enum macsec_offload offload, 2597 struct netlink_ext_ack *extack) 2598 { 2599 enum macsec_offload prev_offload; 2600 const struct macsec_ops *ops; 2601 struct macsec_context ctx; 2602 struct macsec_dev *macsec; 2603 int ret = 0; 2604 2605 macsec = macsec_priv(dev); 2606 2607 /* Check if the offloading mode is supported by the underlying layers */ 2608 if (offload != MACSEC_OFFLOAD_OFF && 2609 !macsec_check_offload(offload, macsec)) 2610 return -EOPNOTSUPP; 2611 2612 /* Check if the net device is busy. */ 2613 if (netif_running(dev)) 2614 return -EBUSY; 2615 2616 /* Check if the device already has rules configured: we do not support 2617 * rules migration. 2618 */ 2619 if (macsec_is_configured(macsec)) 2620 return -EBUSY; 2621 2622 prev_offload = macsec->offload; 2623 2624 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload, 2625 macsec, &ctx); 2626 if (!ops) 2627 return -EOPNOTSUPP; 2628 2629 ctx.secy = &macsec->secy; 2630 ret = offload == MACSEC_OFFLOAD_OFF ? macsec_offload(ops->mdo_del_secy, &ctx) 2631 : macsec_offload(ops->mdo_add_secy, &ctx); 2632 if (ret) 2633 return ret; 2634 2635 /* Remove VLAN filters when disabling offload. */ 2636 if (offload == MACSEC_OFFLOAD_OFF) { 2637 vlan_drop_rx_ctag_filter_info(dev); 2638 vlan_drop_rx_stag_filter_info(dev); 2639 } 2640 WRITE_ONCE(macsec->offload, offload); 2641 /* Add VLAN filters when enabling offload. */ 2642 if (prev_offload == MACSEC_OFFLOAD_OFF) { 2643 ret = vlan_get_rx_ctag_filter_info(dev); 2644 if (ret) { 2645 NL_SET_ERR_MSG_FMT(extack, 2646 "adding ctag VLAN filters failed, err %d", 2647 ret); 2648 goto rollback_offload; 2649 } 2650 ret = vlan_get_rx_stag_filter_info(dev); 2651 if (ret) { 2652 NL_SET_ERR_MSG_FMT(extack, 2653 "adding stag VLAN filters failed, err %d", 2654 ret); 2655 vlan_drop_rx_ctag_filter_info(dev); 2656 goto rollback_offload; 2657 } 2658 } 2659 2660 macsec_set_head_tail_room(dev); 2661 macsec->insert_tx_tag = macsec_needs_tx_tag(macsec, ops); 2662 2663 macsec_inherit_tso_max(dev); 2664 2665 netdev_update_features(dev); 2666 2667 return 0; 2668 2669 rollback_offload: 2670 WRITE_ONCE(macsec->offload, prev_offload); 2671 macsec_offload(ops->mdo_del_secy, &ctx); 2672 2673 return ret; 2674 } 2675 2676 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info) 2677 { 2678 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1]; 2679 struct nlattr **attrs = info->attrs; 2680 enum macsec_offload offload; 2681 struct macsec_dev *macsec; 2682 struct net_device *dev; 2683 int ret = 0; 2684 2685 if (!attrs[MACSEC_ATTR_IFINDEX]) 2686 return -EINVAL; 2687 2688 if (!attrs[MACSEC_ATTR_OFFLOAD]) 2689 return -EINVAL; 2690 2691 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX, 2692 attrs[MACSEC_ATTR_OFFLOAD], 2693 macsec_genl_offload_policy, NULL)) 2694 return -EINVAL; 2695 2696 rtnl_lock(); 2697 2698 dev = get_dev_from_nl(genl_info_net(info), attrs); 2699 if (IS_ERR(dev)) { 2700 ret = PTR_ERR(dev); 2701 goto out; 2702 } 2703 macsec = macsec_priv(dev); 2704 2705 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) { 2706 ret = -EINVAL; 2707 goto out; 2708 } 2709 2710 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]); 2711 2712 if (macsec->offload != offload) 2713 ret = macsec_update_offload(dev, offload, info->extack); 2714 out: 2715 rtnl_unlock(); 2716 return ret; 2717 } 2718 2719 static void get_tx_sa_stats(struct net_device *dev, int an, 2720 struct macsec_tx_sa *tx_sa, 2721 struct macsec_tx_sa_stats *sum) 2722 { 2723 struct macsec_dev *macsec = macsec_priv(dev); 2724 int cpu; 2725 2726 /* If h/w offloading is available, propagate to the device */ 2727 if (macsec_is_offloaded(macsec)) { 2728 const struct macsec_ops *ops; 2729 struct macsec_context ctx; 2730 2731 ops = macsec_get_ops(macsec, &ctx); 2732 if (ops) { 2733 ctx.sa.assoc_num = an; 2734 ctx.sa.tx_sa = tx_sa; 2735 ctx.stats.tx_sa_stats = sum; 2736 ctx.secy = &macsec_priv(dev)->secy; 2737 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx); 2738 } 2739 return; 2740 } 2741 2742 for_each_possible_cpu(cpu) { 2743 const struct macsec_tx_sa_stats *stats = 2744 per_cpu_ptr(tx_sa->stats, cpu); 2745 2746 sum->OutPktsProtected += stats->OutPktsProtected; 2747 sum->OutPktsEncrypted += stats->OutPktsEncrypted; 2748 } 2749 } 2750 2751 static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum) 2752 { 2753 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, 2754 sum->OutPktsProtected) || 2755 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2756 sum->OutPktsEncrypted)) 2757 return -EMSGSIZE; 2758 2759 return 0; 2760 } 2761 2762 static void get_rx_sa_stats(struct net_device *dev, 2763 struct macsec_rx_sc *rx_sc, int an, 2764 struct macsec_rx_sa *rx_sa, 2765 struct macsec_rx_sa_stats *sum) 2766 { 2767 struct macsec_dev *macsec = macsec_priv(dev); 2768 int cpu; 2769 2770 /* If h/w offloading is available, propagate to the device */ 2771 if (macsec_is_offloaded(macsec)) { 2772 const struct macsec_ops *ops; 2773 struct macsec_context ctx; 2774 2775 ops = macsec_get_ops(macsec, &ctx); 2776 if (ops) { 2777 ctx.sa.assoc_num = an; 2778 ctx.sa.rx_sa = rx_sa; 2779 ctx.stats.rx_sa_stats = sum; 2780 ctx.secy = &macsec_priv(dev)->secy; 2781 ctx.rx_sc = rx_sc; 2782 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx); 2783 } 2784 return; 2785 } 2786 2787 for_each_possible_cpu(cpu) { 2788 const struct macsec_rx_sa_stats *stats = 2789 per_cpu_ptr(rx_sa->stats, cpu); 2790 2791 sum->InPktsOK += stats->InPktsOK; 2792 sum->InPktsInvalid += stats->InPktsInvalid; 2793 sum->InPktsNotValid += stats->InPktsNotValid; 2794 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA; 2795 sum->InPktsUnusedSA += stats->InPktsUnusedSA; 2796 } 2797 } 2798 2799 static int copy_rx_sa_stats(struct sk_buff *skb, 2800 struct macsec_rx_sa_stats *sum) 2801 { 2802 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) || 2803 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, 2804 sum->InPktsInvalid) || 2805 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, 2806 sum->InPktsNotValid) || 2807 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2808 sum->InPktsNotUsingSA) || 2809 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, 2810 sum->InPktsUnusedSA)) 2811 return -EMSGSIZE; 2812 2813 return 0; 2814 } 2815 2816 static void get_rx_sc_stats(struct net_device *dev, 2817 struct macsec_rx_sc *rx_sc, 2818 struct macsec_rx_sc_stats *sum) 2819 { 2820 struct macsec_dev *macsec = macsec_priv(dev); 2821 int cpu; 2822 2823 /* If h/w offloading is available, propagate to the device */ 2824 if (macsec_is_offloaded(macsec)) { 2825 const struct macsec_ops *ops; 2826 struct macsec_context ctx; 2827 2828 ops = macsec_get_ops(macsec, &ctx); 2829 if (ops) { 2830 ctx.stats.rx_sc_stats = sum; 2831 ctx.secy = &macsec_priv(dev)->secy; 2832 ctx.rx_sc = rx_sc; 2833 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx); 2834 } 2835 return; 2836 } 2837 2838 for_each_possible_cpu(cpu) { 2839 const struct pcpu_rx_sc_stats *stats; 2840 struct macsec_rx_sc_stats tmp; 2841 unsigned int start; 2842 2843 stats = per_cpu_ptr(rx_sc->stats, cpu); 2844 do { 2845 start = u64_stats_fetch_begin(&stats->syncp); 2846 u64_stats_copy(&tmp, &stats->stats, sizeof(tmp)); 2847 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2848 2849 sum->InOctetsValidated += tmp.InOctetsValidated; 2850 sum->InOctetsDecrypted += tmp.InOctetsDecrypted; 2851 sum->InPktsUnchecked += tmp.InPktsUnchecked; 2852 sum->InPktsDelayed += tmp.InPktsDelayed; 2853 sum->InPktsOK += tmp.InPktsOK; 2854 sum->InPktsInvalid += tmp.InPktsInvalid; 2855 sum->InPktsLate += tmp.InPktsLate; 2856 sum->InPktsNotValid += tmp.InPktsNotValid; 2857 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2858 sum->InPktsUnusedSA += tmp.InPktsUnusedSA; 2859 } 2860 } 2861 2862 static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum) 2863 { 2864 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2865 sum->InOctetsValidated, 2866 MACSEC_RXSC_STATS_ATTR_PAD) || 2867 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2868 sum->InOctetsDecrypted, 2869 MACSEC_RXSC_STATS_ATTR_PAD) || 2870 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2871 sum->InPktsUnchecked, 2872 MACSEC_RXSC_STATS_ATTR_PAD) || 2873 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2874 sum->InPktsDelayed, 2875 MACSEC_RXSC_STATS_ATTR_PAD) || 2876 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2877 sum->InPktsOK, 2878 MACSEC_RXSC_STATS_ATTR_PAD) || 2879 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2880 sum->InPktsInvalid, 2881 MACSEC_RXSC_STATS_ATTR_PAD) || 2882 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2883 sum->InPktsLate, 2884 MACSEC_RXSC_STATS_ATTR_PAD) || 2885 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2886 sum->InPktsNotValid, 2887 MACSEC_RXSC_STATS_ATTR_PAD) || 2888 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2889 sum->InPktsNotUsingSA, 2890 MACSEC_RXSC_STATS_ATTR_PAD) || 2891 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2892 sum->InPktsUnusedSA, 2893 MACSEC_RXSC_STATS_ATTR_PAD)) 2894 return -EMSGSIZE; 2895 2896 return 0; 2897 } 2898 2899 static void get_tx_sc_stats(struct net_device *dev, 2900 struct macsec_tx_sc_stats *sum) 2901 { 2902 struct macsec_dev *macsec = macsec_priv(dev); 2903 int cpu; 2904 2905 /* If h/w offloading is available, propagate to the device */ 2906 if (macsec_is_offloaded(macsec)) { 2907 const struct macsec_ops *ops; 2908 struct macsec_context ctx; 2909 2910 ops = macsec_get_ops(macsec, &ctx); 2911 if (ops) { 2912 ctx.stats.tx_sc_stats = sum; 2913 ctx.secy = &macsec_priv(dev)->secy; 2914 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx); 2915 } 2916 return; 2917 } 2918 2919 for_each_possible_cpu(cpu) { 2920 const struct pcpu_tx_sc_stats *stats; 2921 struct macsec_tx_sc_stats tmp; 2922 unsigned int start; 2923 2924 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu); 2925 do { 2926 start = u64_stats_fetch_begin(&stats->syncp); 2927 u64_stats_copy(&tmp, &stats->stats, sizeof(tmp)); 2928 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2929 2930 sum->OutPktsProtected += tmp.OutPktsProtected; 2931 sum->OutPktsEncrypted += tmp.OutPktsEncrypted; 2932 sum->OutOctetsProtected += tmp.OutOctetsProtected; 2933 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2934 } 2935 } 2936 2937 static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum) 2938 { 2939 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2940 sum->OutPktsProtected, 2941 MACSEC_TXSC_STATS_ATTR_PAD) || 2942 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2943 sum->OutPktsEncrypted, 2944 MACSEC_TXSC_STATS_ATTR_PAD) || 2945 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2946 sum->OutOctetsProtected, 2947 MACSEC_TXSC_STATS_ATTR_PAD) || 2948 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2949 sum->OutOctetsEncrypted, 2950 MACSEC_TXSC_STATS_ATTR_PAD)) 2951 return -EMSGSIZE; 2952 2953 return 0; 2954 } 2955 2956 static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum) 2957 { 2958 struct macsec_dev *macsec = macsec_priv(dev); 2959 int cpu; 2960 2961 /* If h/w offloading is available, propagate to the device */ 2962 if (macsec_is_offloaded(macsec)) { 2963 const struct macsec_ops *ops; 2964 struct macsec_context ctx; 2965 2966 ops = macsec_get_ops(macsec, &ctx); 2967 if (ops) { 2968 ctx.stats.dev_stats = sum; 2969 ctx.secy = &macsec_priv(dev)->secy; 2970 macsec_offload(ops->mdo_get_dev_stats, &ctx); 2971 } 2972 return; 2973 } 2974 2975 for_each_possible_cpu(cpu) { 2976 const struct pcpu_secy_stats *stats; 2977 struct macsec_dev_stats tmp; 2978 unsigned int start; 2979 2980 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu); 2981 do { 2982 start = u64_stats_fetch_begin(&stats->syncp); 2983 u64_stats_copy(&tmp, &stats->stats, sizeof(tmp)); 2984 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2985 2986 sum->OutPktsUntagged += tmp.OutPktsUntagged; 2987 sum->InPktsUntagged += tmp.InPktsUntagged; 2988 sum->OutPktsTooLong += tmp.OutPktsTooLong; 2989 sum->InPktsNoTag += tmp.InPktsNoTag; 2990 sum->InPktsBadTag += tmp.InPktsBadTag; 2991 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2992 sum->InPktsNoSCI += tmp.InPktsNoSCI; 2993 sum->InPktsOverrun += tmp.InPktsOverrun; 2994 } 2995 } 2996 2997 static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum) 2998 { 2999 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 3000 sum->OutPktsUntagged, 3001 MACSEC_SECY_STATS_ATTR_PAD) || 3002 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 3003 sum->InPktsUntagged, 3004 MACSEC_SECY_STATS_ATTR_PAD) || 3005 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 3006 sum->OutPktsTooLong, 3007 MACSEC_SECY_STATS_ATTR_PAD) || 3008 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 3009 sum->InPktsNoTag, 3010 MACSEC_SECY_STATS_ATTR_PAD) || 3011 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 3012 sum->InPktsBadTag, 3013 MACSEC_SECY_STATS_ATTR_PAD) || 3014 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 3015 sum->InPktsUnknownSCI, 3016 MACSEC_SECY_STATS_ATTR_PAD) || 3017 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 3018 sum->InPktsNoSCI, 3019 MACSEC_SECY_STATS_ATTR_PAD) || 3020 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 3021 sum->InPktsOverrun, 3022 MACSEC_SECY_STATS_ATTR_PAD)) 3023 return -EMSGSIZE; 3024 3025 return 0; 3026 } 3027 3028 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 3029 { 3030 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3031 struct nlattr *secy_nest = nla_nest_start_noflag(skb, 3032 MACSEC_ATTR_SECY); 3033 u64 csid; 3034 3035 if (!secy_nest) 3036 return 1; 3037 3038 switch (secy->key_len) { 3039 case MACSEC_GCM_AES_128_SAK_LEN: 3040 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 3041 break; 3042 case MACSEC_GCM_AES_256_SAK_LEN: 3043 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 3044 break; 3045 default: 3046 goto cancel; 3047 } 3048 3049 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 3050 MACSEC_SECY_ATTR_PAD) || 3051 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 3052 csid, MACSEC_SECY_ATTR_PAD) || 3053 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 3054 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 3055 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 3056 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 3057 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 3058 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 3059 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 3060 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 3061 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 3062 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 3063 goto cancel; 3064 3065 if (secy->replay_protect) { 3066 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 3067 goto cancel; 3068 } 3069 3070 nla_nest_end(skb, secy_nest); 3071 return 0; 3072 3073 cancel: 3074 nla_nest_cancel(skb, secy_nest); 3075 return 1; 3076 } 3077 3078 static noinline_for_stack int 3079 dump_secy(struct macsec_secy *secy, struct net_device *dev, 3080 struct sk_buff *skb, struct netlink_callback *cb) 3081 { 3082 struct macsec_tx_sc_stats tx_sc_stats = {0, }; 3083 struct macsec_tx_sa_stats tx_sa_stats = {0, }; 3084 struct macsec_rx_sc_stats rx_sc_stats = {0, }; 3085 struct macsec_rx_sa_stats rx_sa_stats = {0, }; 3086 struct macsec_dev *macsec = netdev_priv(dev); 3087 struct macsec_dev_stats dev_stats = {0, }; 3088 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3089 struct nlattr *txsa_list, *rxsc_list; 3090 struct macsec_rx_sc *rx_sc; 3091 struct nlattr *attr; 3092 void *hdr; 3093 int i, j; 3094 3095 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3096 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 3097 if (!hdr) 3098 return -EMSGSIZE; 3099 3100 genl_dump_check_consistent(cb, hdr); 3101 3102 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 3103 goto nla_put_failure; 3104 3105 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD); 3106 if (!attr) 3107 goto nla_put_failure; 3108 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload)) 3109 goto nla_put_failure; 3110 nla_nest_end(skb, attr); 3111 3112 if (nla_put_secy(secy, skb)) 3113 goto nla_put_failure; 3114 3115 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS); 3116 if (!attr) 3117 goto nla_put_failure; 3118 3119 get_tx_sc_stats(dev, &tx_sc_stats); 3120 if (copy_tx_sc_stats(skb, &tx_sc_stats)) { 3121 nla_nest_cancel(skb, attr); 3122 goto nla_put_failure; 3123 } 3124 nla_nest_end(skb, attr); 3125 3126 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS); 3127 if (!attr) 3128 goto nla_put_failure; 3129 get_secy_stats(dev, &dev_stats); 3130 if (copy_secy_stats(skb, &dev_stats)) { 3131 nla_nest_cancel(skb, attr); 3132 goto nla_put_failure; 3133 } 3134 nla_nest_end(skb, attr); 3135 3136 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST); 3137 if (!txsa_list) 3138 goto nla_put_failure; 3139 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 3140 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 3141 struct nlattr *txsa_nest; 3142 u64 pn; 3143 int pn_len; 3144 3145 if (!tx_sa) 3146 continue; 3147 3148 txsa_nest = nla_nest_start_noflag(skb, j++); 3149 if (!txsa_nest) { 3150 nla_nest_cancel(skb, txsa_list); 3151 goto nla_put_failure; 3152 } 3153 3154 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS); 3155 if (!attr) { 3156 nla_nest_cancel(skb, txsa_nest); 3157 nla_nest_cancel(skb, txsa_list); 3158 goto nla_put_failure; 3159 } 3160 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats)); 3161 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats); 3162 if (copy_tx_sa_stats(skb, &tx_sa_stats)) { 3163 nla_nest_cancel(skb, attr); 3164 nla_nest_cancel(skb, txsa_nest); 3165 nla_nest_cancel(skb, txsa_list); 3166 goto nla_put_failure; 3167 } 3168 nla_nest_end(skb, attr); 3169 3170 if (secy->xpn) { 3171 pn = tx_sa->next_pn; 3172 pn_len = MACSEC_XPN_PN_LEN; 3173 } else { 3174 pn = tx_sa->next_pn_halves.lower; 3175 pn_len = MACSEC_DEFAULT_PN_LEN; 3176 } 3177 3178 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3179 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3180 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 3181 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) || 3182 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 3183 nla_nest_cancel(skb, txsa_nest); 3184 nla_nest_cancel(skb, txsa_list); 3185 goto nla_put_failure; 3186 } 3187 3188 nla_nest_end(skb, txsa_nest); 3189 } 3190 nla_nest_end(skb, txsa_list); 3191 3192 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST); 3193 if (!rxsc_list) 3194 goto nla_put_failure; 3195 3196 j = 1; 3197 for_each_rxsc_rtnl(secy, rx_sc) { 3198 int k; 3199 struct nlattr *rxsa_list; 3200 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++); 3201 3202 if (!rxsc_nest) { 3203 nla_nest_cancel(skb, rxsc_list); 3204 goto nla_put_failure; 3205 } 3206 3207 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 3208 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 3209 MACSEC_RXSC_ATTR_PAD)) { 3210 nla_nest_cancel(skb, rxsc_nest); 3211 nla_nest_cancel(skb, rxsc_list); 3212 goto nla_put_failure; 3213 } 3214 3215 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS); 3216 if (!attr) { 3217 nla_nest_cancel(skb, rxsc_nest); 3218 nla_nest_cancel(skb, rxsc_list); 3219 goto nla_put_failure; 3220 } 3221 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats)); 3222 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats); 3223 if (copy_rx_sc_stats(skb, &rx_sc_stats)) { 3224 nla_nest_cancel(skb, attr); 3225 nla_nest_cancel(skb, rxsc_nest); 3226 nla_nest_cancel(skb, rxsc_list); 3227 goto nla_put_failure; 3228 } 3229 nla_nest_end(skb, attr); 3230 3231 rxsa_list = nla_nest_start_noflag(skb, 3232 MACSEC_RXSC_ATTR_SA_LIST); 3233 if (!rxsa_list) { 3234 nla_nest_cancel(skb, rxsc_nest); 3235 nla_nest_cancel(skb, rxsc_list); 3236 goto nla_put_failure; 3237 } 3238 3239 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 3240 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 3241 struct nlattr *rxsa_nest; 3242 u64 pn; 3243 int pn_len; 3244 3245 if (!rx_sa) 3246 continue; 3247 3248 rxsa_nest = nla_nest_start_noflag(skb, k++); 3249 if (!rxsa_nest) { 3250 nla_nest_cancel(skb, rxsa_list); 3251 nla_nest_cancel(skb, rxsc_nest); 3252 nla_nest_cancel(skb, rxsc_list); 3253 goto nla_put_failure; 3254 } 3255 3256 attr = nla_nest_start_noflag(skb, 3257 MACSEC_SA_ATTR_STATS); 3258 if (!attr) { 3259 nla_nest_cancel(skb, rxsa_list); 3260 nla_nest_cancel(skb, rxsc_nest); 3261 nla_nest_cancel(skb, rxsc_list); 3262 goto nla_put_failure; 3263 } 3264 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats)); 3265 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats); 3266 if (copy_rx_sa_stats(skb, &rx_sa_stats)) { 3267 nla_nest_cancel(skb, attr); 3268 nla_nest_cancel(skb, rxsa_list); 3269 nla_nest_cancel(skb, rxsc_nest); 3270 nla_nest_cancel(skb, rxsc_list); 3271 goto nla_put_failure; 3272 } 3273 nla_nest_end(skb, attr); 3274 3275 if (secy->xpn) { 3276 pn = rx_sa->next_pn; 3277 pn_len = MACSEC_XPN_PN_LEN; 3278 } else { 3279 pn = rx_sa->next_pn_halves.lower; 3280 pn_len = MACSEC_DEFAULT_PN_LEN; 3281 } 3282 3283 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3284 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3285 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 3286 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) || 3287 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 3288 nla_nest_cancel(skb, rxsa_nest); 3289 nla_nest_cancel(skb, rxsc_nest); 3290 nla_nest_cancel(skb, rxsc_list); 3291 goto nla_put_failure; 3292 } 3293 nla_nest_end(skb, rxsa_nest); 3294 } 3295 3296 nla_nest_end(skb, rxsa_list); 3297 nla_nest_end(skb, rxsc_nest); 3298 } 3299 3300 nla_nest_end(skb, rxsc_list); 3301 3302 genlmsg_end(skb, hdr); 3303 3304 return 0; 3305 3306 nla_put_failure: 3307 genlmsg_cancel(skb, hdr); 3308 return -EMSGSIZE; 3309 } 3310 3311 static int macsec_generation = 1; /* protected by RTNL */ 3312 3313 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 3314 { 3315 struct net *net = sock_net(skb->sk); 3316 struct net_device *dev; 3317 int dev_idx, d; 3318 3319 dev_idx = cb->args[0]; 3320 3321 d = 0; 3322 rtnl_lock(); 3323 3324 cb->seq = macsec_generation; 3325 3326 for_each_netdev(net, dev) { 3327 struct macsec_secy *secy; 3328 3329 if (d < dev_idx) 3330 goto next; 3331 3332 if (!netif_is_macsec(dev)) 3333 goto next; 3334 3335 secy = &macsec_priv(dev)->secy; 3336 if (dump_secy(secy, dev, skb, cb) < 0) 3337 goto done; 3338 next: 3339 d++; 3340 } 3341 3342 done: 3343 rtnl_unlock(); 3344 cb->args[0] = d; 3345 return skb->len; 3346 } 3347 3348 static const struct genl_small_ops macsec_genl_ops[] = { 3349 { 3350 .cmd = MACSEC_CMD_GET_TXSC, 3351 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3352 .dumpit = macsec_dump_txsc, 3353 }, 3354 { 3355 .cmd = MACSEC_CMD_ADD_RXSC, 3356 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3357 .doit = macsec_add_rxsc, 3358 .flags = GENL_ADMIN_PERM, 3359 }, 3360 { 3361 .cmd = MACSEC_CMD_DEL_RXSC, 3362 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3363 .doit = macsec_del_rxsc, 3364 .flags = GENL_ADMIN_PERM, 3365 }, 3366 { 3367 .cmd = MACSEC_CMD_UPD_RXSC, 3368 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3369 .doit = macsec_upd_rxsc, 3370 .flags = GENL_ADMIN_PERM, 3371 }, 3372 { 3373 .cmd = MACSEC_CMD_ADD_TXSA, 3374 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3375 .doit = macsec_add_txsa, 3376 .flags = GENL_ADMIN_PERM, 3377 }, 3378 { 3379 .cmd = MACSEC_CMD_DEL_TXSA, 3380 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3381 .doit = macsec_del_txsa, 3382 .flags = GENL_ADMIN_PERM, 3383 }, 3384 { 3385 .cmd = MACSEC_CMD_UPD_TXSA, 3386 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3387 .doit = macsec_upd_txsa, 3388 .flags = GENL_ADMIN_PERM, 3389 }, 3390 { 3391 .cmd = MACSEC_CMD_ADD_RXSA, 3392 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3393 .doit = macsec_add_rxsa, 3394 .flags = GENL_ADMIN_PERM, 3395 }, 3396 { 3397 .cmd = MACSEC_CMD_DEL_RXSA, 3398 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3399 .doit = macsec_del_rxsa, 3400 .flags = GENL_ADMIN_PERM, 3401 }, 3402 { 3403 .cmd = MACSEC_CMD_UPD_RXSA, 3404 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3405 .doit = macsec_upd_rxsa, 3406 .flags = GENL_ADMIN_PERM, 3407 }, 3408 { 3409 .cmd = MACSEC_CMD_UPD_OFFLOAD, 3410 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3411 .doit = macsec_upd_offload, 3412 .flags = GENL_ADMIN_PERM, 3413 }, 3414 }; 3415 3416 static struct genl_family macsec_fam __ro_after_init = { 3417 .name = MACSEC_GENL_NAME, 3418 .hdrsize = 0, 3419 .version = MACSEC_GENL_VERSION, 3420 .maxattr = MACSEC_ATTR_MAX, 3421 .policy = macsec_genl_policy, 3422 .netnsok = true, 3423 .module = THIS_MODULE, 3424 .small_ops = macsec_genl_ops, 3425 .n_small_ops = ARRAY_SIZE(macsec_genl_ops), 3426 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1, 3427 }; 3428 3429 static struct sk_buff *macsec_insert_tx_tag(struct sk_buff *skb, 3430 struct net_device *dev) 3431 { 3432 struct macsec_dev *macsec = macsec_priv(dev); 3433 const struct macsec_ops *ops; 3434 struct phy_device *phydev; 3435 struct macsec_context ctx; 3436 int skb_final_len; 3437 int err; 3438 3439 ops = macsec_get_ops(macsec, &ctx); 3440 skb_final_len = skb->len - ETH_HLEN + ops->needed_headroom + 3441 ops->needed_tailroom; 3442 if (unlikely(skb_final_len > macsec->real_dev->mtu)) { 3443 err = -EINVAL; 3444 goto cleanup; 3445 } 3446 3447 phydev = macsec->real_dev->phydev; 3448 3449 err = skb_ensure_writable_head_tail(skb, dev); 3450 if (unlikely(err < 0)) 3451 goto cleanup; 3452 3453 err = ops->mdo_insert_tx_tag(phydev, skb); 3454 if (unlikely(err)) 3455 goto cleanup; 3456 3457 return skb; 3458 cleanup: 3459 kfree_skb(skb); 3460 return ERR_PTR(err); 3461 } 3462 3463 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 3464 struct net_device *dev) 3465 { 3466 struct macsec_dev *macsec = netdev_priv(dev); 3467 struct macsec_secy *secy = &macsec->secy; 3468 struct pcpu_secy_stats *secy_stats; 3469 int ret, len; 3470 3471 if (macsec_is_offloaded(netdev_priv(dev))) { 3472 struct metadata_dst *md_dst = secy->tx_sc.md_dst; 3473 3474 skb_dst_drop(skb); 3475 dst_hold(&md_dst->dst); 3476 skb_dst_set(skb, &md_dst->dst); 3477 3478 if (macsec->insert_tx_tag) { 3479 skb = macsec_insert_tx_tag(skb, dev); 3480 if (IS_ERR(skb)) { 3481 DEV_STATS_INC(dev, tx_dropped); 3482 return NETDEV_TX_OK; 3483 } 3484 } 3485 3486 skb->dev = macsec->real_dev; 3487 return dev_queue_xmit(skb); 3488 } 3489 3490 /* 10.5 */ 3491 if (!secy->protect_frames) { 3492 secy_stats = this_cpu_ptr(macsec->stats); 3493 u64_stats_update_begin(&secy_stats->syncp); 3494 secy_stats->stats.OutPktsUntagged++; 3495 u64_stats_update_end(&secy_stats->syncp); 3496 skb->dev = macsec->real_dev; 3497 len = skb->len; 3498 ret = dev_queue_xmit(skb); 3499 count_tx(dev, ret, len); 3500 return ret; 3501 } 3502 3503 if (!secy->operational) { 3504 kfree_skb(skb); 3505 DEV_STATS_INC(dev, tx_dropped); 3506 return NETDEV_TX_OK; 3507 } 3508 3509 len = skb->len; 3510 skb = macsec_encrypt(skb, dev); 3511 if (IS_ERR(skb)) { 3512 if (PTR_ERR(skb) != -EINPROGRESS) 3513 DEV_STATS_INC(dev, tx_dropped); 3514 return NETDEV_TX_OK; 3515 } 3516 3517 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 3518 3519 macsec_encrypt_finish(skb, dev); 3520 ret = dev_queue_xmit(skb); 3521 count_tx(dev, ret, len); 3522 return ret; 3523 } 3524 3525 #define MACSEC_FEATURES \ 3526 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 3527 NETIF_F_HW_VLAN_STAG_FILTER | NETIF_F_HW_VLAN_CTAG_FILTER) 3528 3529 #define MACSEC_OFFLOAD_FEATURES \ 3530 (MACSEC_FEATURES | NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES | \ 3531 NETIF_F_LRO | NETIF_F_RXHASH | NETIF_F_CSUM_MASK | NETIF_F_RXCSUM) 3532 3533 static int macsec_dev_init(struct net_device *dev) 3534 { 3535 struct macsec_dev *macsec = macsec_priv(dev); 3536 struct net_device *real_dev = macsec->real_dev; 3537 int err; 3538 3539 err = gro_cells_init(&macsec->gro_cells, dev); 3540 if (err) 3541 return err; 3542 3543 err = -ENOMEM; 3544 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 3545 if (!macsec->stats) 3546 goto destroy_gro_cells; 3547 3548 macsec->secy.tx_sc.stats = 3549 netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 3550 if (!macsec->secy.tx_sc.stats) 3551 goto free_secy_stats; 3552 3553 macsec->secy.tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, 3554 GFP_KERNEL); 3555 if (!macsec->secy.tx_sc.md_dst) 3556 goto free_tx_sc_stats; 3557 macsec->secy.tx_sc.md_dst->u.macsec_info.sci = macsec->secy.sci; 3558 3559 macsec_inherit_tso_max(dev); 3560 3561 dev->hw_features = real_dev->hw_features & MACSEC_OFFLOAD_FEATURES; 3562 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 3563 3564 dev->features = real_dev->features & MACSEC_OFFLOAD_FEATURES; 3565 dev->features |= NETIF_F_GSO_SOFTWARE; 3566 dev->lltx = true; 3567 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 3568 3569 macsec_set_head_tail_room(dev); 3570 3571 if (is_zero_ether_addr(dev->broadcast)) 3572 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 3573 3574 /* Get macsec's reference to real_dev */ 3575 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL); 3576 3577 return 0; 3578 3579 free_tx_sc_stats: 3580 free_percpu(macsec->secy.tx_sc.stats); 3581 free_secy_stats: 3582 free_percpu(macsec->stats); 3583 destroy_gro_cells: 3584 gro_cells_destroy(&macsec->gro_cells); 3585 return err; 3586 } 3587 3588 static void macsec_dev_uninit(struct net_device *dev) 3589 { 3590 struct macsec_dev *macsec = macsec_priv(dev); 3591 3592 gro_cells_destroy(&macsec->gro_cells); 3593 } 3594 3595 static netdev_features_t macsec_fix_features(struct net_device *dev, 3596 netdev_features_t features) 3597 { 3598 struct macsec_dev *macsec = macsec_priv(dev); 3599 struct net_device *real_dev = macsec->real_dev; 3600 netdev_features_t mask; 3601 3602 mask = macsec_is_offloaded(macsec) ? MACSEC_OFFLOAD_FEATURES 3603 : MACSEC_FEATURES; 3604 3605 features &= (real_dev->features & mask) | 3606 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 3607 3608 return features; 3609 } 3610 3611 static int macsec_dev_open(struct net_device *dev) 3612 { 3613 struct macsec_dev *macsec = macsec_priv(dev); 3614 struct net_device *real_dev = macsec->real_dev; 3615 int err; 3616 3617 err = dev_uc_add(real_dev, dev->dev_addr); 3618 if (err < 0) 3619 return err; 3620 3621 if (dev->flags & IFF_ALLMULTI) { 3622 err = dev_set_allmulti(real_dev, 1); 3623 if (err < 0) 3624 goto del_unicast; 3625 } 3626 3627 if (dev->flags & IFF_PROMISC) { 3628 err = dev_set_promiscuity(real_dev, 1); 3629 if (err < 0) 3630 goto clear_allmulti; 3631 } 3632 3633 /* If h/w offloading is available, propagate to the device */ 3634 if (macsec_is_offloaded(macsec)) { 3635 const struct macsec_ops *ops; 3636 struct macsec_context ctx; 3637 3638 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3639 if (!ops) { 3640 err = -EOPNOTSUPP; 3641 goto clear_promisc; 3642 } 3643 3644 ctx.secy = &macsec->secy; 3645 err = macsec_offload(ops->mdo_dev_open, &ctx); 3646 if (err) 3647 goto clear_promisc; 3648 } 3649 3650 if (netif_carrier_ok(real_dev)) 3651 netif_carrier_on(dev); 3652 3653 return 0; 3654 clear_promisc: 3655 if (dev->flags & IFF_PROMISC) 3656 dev_set_promiscuity(real_dev, -1); 3657 clear_allmulti: 3658 if (dev->flags & IFF_ALLMULTI) 3659 dev_set_allmulti(real_dev, -1); 3660 del_unicast: 3661 dev_uc_del(real_dev, dev->dev_addr); 3662 netif_carrier_off(dev); 3663 return err; 3664 } 3665 3666 static int macsec_dev_stop(struct net_device *dev) 3667 { 3668 struct macsec_dev *macsec = macsec_priv(dev); 3669 struct net_device *real_dev = macsec->real_dev; 3670 3671 netif_carrier_off(dev); 3672 3673 /* If h/w offloading is available, propagate to the device */ 3674 if (macsec_is_offloaded(macsec)) { 3675 const struct macsec_ops *ops; 3676 struct macsec_context ctx; 3677 3678 ops = macsec_get_ops(macsec, &ctx); 3679 if (ops) { 3680 ctx.secy = &macsec->secy; 3681 macsec_offload(ops->mdo_dev_stop, &ctx); 3682 } 3683 } 3684 3685 dev_mc_unsync(real_dev, dev); 3686 dev_uc_unsync(real_dev, dev); 3687 3688 if (dev->flags & IFF_ALLMULTI) 3689 dev_set_allmulti(real_dev, -1); 3690 3691 if (dev->flags & IFF_PROMISC) 3692 dev_set_promiscuity(real_dev, -1); 3693 3694 dev_uc_del(real_dev, dev->dev_addr); 3695 3696 return 0; 3697 } 3698 3699 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 3700 { 3701 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3702 3703 if (!(dev->flags & IFF_UP)) 3704 return; 3705 3706 if (change & IFF_ALLMULTI) 3707 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 3708 3709 if (change & IFF_PROMISC) 3710 dev_set_promiscuity(real_dev, 3711 dev->flags & IFF_PROMISC ? 1 : -1); 3712 } 3713 3714 static void macsec_dev_set_rx_mode(struct net_device *dev) 3715 { 3716 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3717 3718 dev_mc_sync(real_dev, dev); 3719 dev_uc_sync(real_dev, dev); 3720 } 3721 3722 static int macsec_set_mac_address(struct net_device *dev, void *p) 3723 { 3724 struct macsec_dev *macsec = macsec_priv(dev); 3725 struct net_device *real_dev = macsec->real_dev; 3726 struct sockaddr *addr = p; 3727 u8 old_addr[ETH_ALEN]; 3728 int err; 3729 3730 if (!is_valid_ether_addr(addr->sa_data)) 3731 return -EADDRNOTAVAIL; 3732 3733 if (dev->flags & IFF_UP) { 3734 err = dev_uc_add(real_dev, addr->sa_data); 3735 if (err < 0) 3736 return err; 3737 } 3738 3739 ether_addr_copy(old_addr, dev->dev_addr); 3740 eth_hw_addr_set(dev, addr->sa_data); 3741 3742 /* If h/w offloading is available, propagate to the device */ 3743 if (macsec_is_offloaded(macsec)) { 3744 const struct macsec_ops *ops; 3745 struct macsec_context ctx; 3746 3747 ops = macsec_get_ops(macsec, &ctx); 3748 if (!ops) { 3749 err = -EOPNOTSUPP; 3750 goto restore_old_addr; 3751 } 3752 3753 ctx.secy = &macsec->secy; 3754 err = macsec_offload(ops->mdo_upd_secy, &ctx); 3755 if (err) 3756 goto restore_old_addr; 3757 } 3758 3759 if (dev->flags & IFF_UP) 3760 dev_uc_del(real_dev, old_addr); 3761 3762 return 0; 3763 3764 restore_old_addr: 3765 if (dev->flags & IFF_UP) 3766 dev_uc_del(real_dev, addr->sa_data); 3767 3768 eth_hw_addr_set(dev, old_addr); 3769 3770 return err; 3771 } 3772 3773 static int macsec_vlan_rx_add_vid(struct net_device *dev, 3774 __be16 proto, u16 vid) 3775 { 3776 struct macsec_dev *macsec = netdev_priv(dev); 3777 3778 if (!macsec_is_offloaded(macsec)) 3779 return 0; 3780 3781 return vlan_vid_add(macsec->real_dev, proto, vid); 3782 } 3783 3784 static int macsec_vlan_rx_kill_vid(struct net_device *dev, 3785 __be16 proto, u16 vid) 3786 { 3787 struct macsec_dev *macsec = netdev_priv(dev); 3788 3789 if (!macsec_is_offloaded(macsec)) 3790 return 0; 3791 3792 vlan_vid_del(macsec->real_dev, proto, vid); 3793 return 0; 3794 } 3795 3796 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 3797 { 3798 struct macsec_dev *macsec = macsec_priv(dev); 3799 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 3800 3801 if (macsec->real_dev->mtu - extra < new_mtu) 3802 return -ERANGE; 3803 3804 WRITE_ONCE(dev->mtu, new_mtu); 3805 3806 return 0; 3807 } 3808 3809 static void macsec_get_stats64(struct net_device *dev, 3810 struct rtnl_link_stats64 *s) 3811 { 3812 if (!dev->tstats) 3813 return; 3814 3815 dev_fetch_sw_netstats(s, dev->tstats); 3816 3817 s->rx_dropped = DEV_STATS_READ(dev, rx_dropped); 3818 s->tx_dropped = DEV_STATS_READ(dev, tx_dropped); 3819 s->rx_errors = DEV_STATS_READ(dev, rx_errors); 3820 } 3821 3822 static int macsec_get_iflink(const struct net_device *dev) 3823 { 3824 return READ_ONCE(macsec_priv(dev)->real_dev->ifindex); 3825 } 3826 3827 static const struct net_device_ops macsec_netdev_ops = { 3828 .ndo_init = macsec_dev_init, 3829 .ndo_uninit = macsec_dev_uninit, 3830 .ndo_open = macsec_dev_open, 3831 .ndo_stop = macsec_dev_stop, 3832 .ndo_fix_features = macsec_fix_features, 3833 .ndo_change_mtu = macsec_change_mtu, 3834 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 3835 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 3836 .ndo_set_mac_address = macsec_set_mac_address, 3837 .ndo_vlan_rx_add_vid = macsec_vlan_rx_add_vid, 3838 .ndo_vlan_rx_kill_vid = macsec_vlan_rx_kill_vid, 3839 .ndo_start_xmit = macsec_start_xmit, 3840 .ndo_get_stats64 = macsec_get_stats64, 3841 .ndo_get_iflink = macsec_get_iflink, 3842 }; 3843 3844 static const struct device_type macsec_type = { 3845 .name = "macsec", 3846 }; 3847 3848 static int validate_cipher_suite(const struct nlattr *attr, 3849 struct netlink_ext_ack *extack); 3850 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 3851 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 3852 [IFLA_MACSEC_PORT] = { .type = NLA_U16 }, 3853 [IFLA_MACSEC_ICV_LEN] = NLA_POLICY_RANGE(NLA_U8, MACSEC_MIN_ICV_LEN, MACSEC_STD_ICV_LEN), 3854 [IFLA_MACSEC_CIPHER_SUITE] = NLA_POLICY_VALIDATE_FN(NLA_U64, validate_cipher_suite), 3855 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 3856 [IFLA_MACSEC_ENCODING_SA] = NLA_POLICY_MAX(NLA_U8, MACSEC_NUM_AN - 1), 3857 [IFLA_MACSEC_ENCRYPT] = NLA_POLICY_MAX(NLA_U8, 1), 3858 [IFLA_MACSEC_PROTECT] = NLA_POLICY_MAX(NLA_U8, 1), 3859 [IFLA_MACSEC_INC_SCI] = NLA_POLICY_MAX(NLA_U8, 1), 3860 [IFLA_MACSEC_ES] = NLA_POLICY_MAX(NLA_U8, 1), 3861 [IFLA_MACSEC_SCB] = NLA_POLICY_MAX(NLA_U8, 1), 3862 [IFLA_MACSEC_REPLAY_PROTECT] = NLA_POLICY_MAX(NLA_U8, 1), 3863 [IFLA_MACSEC_VALIDATION] = NLA_POLICY_MAX(NLA_U8, MACSEC_VALIDATE_MAX), 3864 [IFLA_MACSEC_OFFLOAD] = NLA_POLICY_MAX(NLA_U8, MACSEC_OFFLOAD_MAX), 3865 }; 3866 3867 static void macsec_free_netdev(struct net_device *dev) 3868 { 3869 struct macsec_dev *macsec = macsec_priv(dev); 3870 3871 dst_release(&macsec->secy.tx_sc.md_dst->dst); 3872 free_percpu(macsec->stats); 3873 free_percpu(macsec->secy.tx_sc.stats); 3874 3875 /* Get rid of the macsec's reference to real_dev */ 3876 netdev_put(macsec->real_dev, &macsec->dev_tracker); 3877 } 3878 3879 static void macsec_setup(struct net_device *dev) 3880 { 3881 ether_setup(dev); 3882 dev->min_mtu = 0; 3883 dev->max_mtu = ETH_MAX_MTU; 3884 dev->priv_flags |= IFF_NO_QUEUE | IFF_UNICAST_FLT; 3885 dev->netdev_ops = &macsec_netdev_ops; 3886 dev->needs_free_netdev = true; 3887 dev->priv_destructor = macsec_free_netdev; 3888 SET_NETDEV_DEVTYPE(dev, &macsec_type); 3889 3890 eth_zero_addr(dev->broadcast); 3891 } 3892 3893 static int macsec_changelink_common(struct net_device *dev, 3894 struct nlattr *data[]) 3895 { 3896 struct macsec_secy *secy; 3897 struct macsec_tx_sc *tx_sc; 3898 3899 secy = &macsec_priv(dev)->secy; 3900 tx_sc = &secy->tx_sc; 3901 3902 if (data[IFLA_MACSEC_ENCODING_SA]) { 3903 struct macsec_tx_sa *tx_sa; 3904 u8 encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3905 3906 WRITE_ONCE(tx_sc->encoding_sa, encoding_sa); 3907 tx_sa = rtnl_dereference(tx_sc->sa[encoding_sa]); 3908 3909 secy->operational = tx_sa && tx_sa->active; 3910 } 3911 3912 if (data[IFLA_MACSEC_ENCRYPT]) 3913 WRITE_ONCE(tx_sc->encrypt, !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT])); 3914 3915 if (data[IFLA_MACSEC_PROTECT]) 3916 WRITE_ONCE(secy->protect_frames, !!nla_get_u8(data[IFLA_MACSEC_PROTECT])); 3917 3918 if (data[IFLA_MACSEC_INC_SCI]) 3919 WRITE_ONCE(tx_sc->send_sci, !!nla_get_u8(data[IFLA_MACSEC_INC_SCI])); 3920 3921 if (data[IFLA_MACSEC_ES]) 3922 WRITE_ONCE(tx_sc->end_station, !!nla_get_u8(data[IFLA_MACSEC_ES])); 3923 3924 if (data[IFLA_MACSEC_SCB]) 3925 WRITE_ONCE(tx_sc->scb, !!nla_get_u8(data[IFLA_MACSEC_SCB])); 3926 3927 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3928 WRITE_ONCE(secy->replay_protect, !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])); 3929 3930 if (data[IFLA_MACSEC_VALIDATION]) 3931 WRITE_ONCE(secy->validate_frames, nla_get_u8(data[IFLA_MACSEC_VALIDATION])); 3932 3933 if (data[IFLA_MACSEC_CIPHER_SUITE]) { 3934 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) { 3935 case MACSEC_CIPHER_ID_GCM_AES_128: 3936 case MACSEC_DEFAULT_CIPHER_ID: 3937 WRITE_ONCE(secy->key_len, MACSEC_GCM_AES_128_SAK_LEN); 3938 WRITE_ONCE(secy->xpn, false); 3939 break; 3940 case MACSEC_CIPHER_ID_GCM_AES_256: 3941 WRITE_ONCE(secy->key_len, MACSEC_GCM_AES_256_SAK_LEN); 3942 WRITE_ONCE(secy->xpn, false); 3943 break; 3944 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 3945 WRITE_ONCE(secy->key_len, MACSEC_GCM_AES_128_SAK_LEN); 3946 WRITE_ONCE(secy->xpn, true); 3947 break; 3948 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 3949 WRITE_ONCE(secy->key_len, MACSEC_GCM_AES_256_SAK_LEN); 3950 WRITE_ONCE(secy->xpn, true); 3951 break; 3952 default: 3953 return -EINVAL; 3954 } 3955 } 3956 3957 if (data[IFLA_MACSEC_WINDOW]) { 3958 u32 replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3959 3960 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window 3961 * for XPN cipher suites */ 3962 if (secy->xpn && 3963 replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW) 3964 return -EINVAL; 3965 WRITE_ONCE(secy->replay_window, replay_window); 3966 } 3967 3968 return 0; 3969 } 3970 3971 /* Both a change of the offload state (mdo_add_secy()/mdo_del_secy()) and 3972 * any request against an already offloaded device (mdo_upd_secy()) reach 3973 * the driver of real_dev, which may live in a different network namespace 3974 * from the macsec device. Require CAP_NET_ADMIN over real_dev's namespace 3975 * for those; local attributes of a non-offloaded device are unaffected. 3976 */ 3977 static int macsec_changelink_check_netns(struct net_device *dev, 3978 struct nlattr *data[], 3979 struct netlink_ext_ack *extack) 3980 { 3981 struct macsec_dev *macsec = macsec_priv(dev); 3982 bool reaches_real_dev; 3983 3984 reaches_real_dev = macsec_is_offloaded(macsec); 3985 if (data[IFLA_MACSEC_OFFLOAD] && 3986 nla_get_u8(data[IFLA_MACSEC_OFFLOAD]) != macsec->offload) 3987 reaches_real_dev = true; 3988 3989 if (!reaches_real_dev || 3990 rtnl_dev_link_net_capable(dev, dev_net(macsec->real_dev))) 3991 return 0; 3992 3993 NL_SET_ERR_MSG(extack, 3994 "Changing a MACsec device whose real device is in another network namespace requires CAP_NET_ADMIN in that namespace"); 3995 return -EPERM; 3996 } 3997 3998 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3999 struct nlattr *data[], 4000 struct netlink_ext_ack *extack) 4001 { 4002 struct macsec_dev *macsec = macsec_priv(dev); 4003 bool macsec_offload_state_change = false; 4004 enum macsec_offload offload; 4005 struct macsec_tx_sc tx_sc; 4006 struct macsec_secy secy; 4007 int ret; 4008 4009 if (!data) 4010 return 0; 4011 4012 ret = macsec_changelink_check_netns(dev, data, extack); 4013 if (ret) 4014 return ret; 4015 4016 if (data[IFLA_MACSEC_CIPHER_SUITE] || 4017 data[IFLA_MACSEC_ICV_LEN] || 4018 data[IFLA_MACSEC_SCI] || 4019 data[IFLA_MACSEC_PORT]) 4020 return -EINVAL; 4021 4022 /* Keep a copy of unmodified secy and tx_sc, in case the offload 4023 * propagation fails, to revert macsec_changelink_common. 4024 */ 4025 memcpy(&secy, &macsec->secy, sizeof(secy)); 4026 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc)); 4027 4028 ret = macsec_changelink_common(dev, data); 4029 if (ret) 4030 goto cleanup; 4031 4032 if (data[IFLA_MACSEC_OFFLOAD]) { 4033 offload = nla_get_u8(data[IFLA_MACSEC_OFFLOAD]); 4034 if (macsec->offload != offload) { 4035 macsec_offload_state_change = true; 4036 ret = macsec_update_offload(dev, offload, extack); 4037 if (ret) 4038 goto cleanup; 4039 } 4040 } 4041 4042 /* If h/w offloading is available, propagate to the device */ 4043 if (!macsec_offload_state_change && macsec_is_offloaded(macsec)) { 4044 const struct macsec_ops *ops; 4045 struct macsec_context ctx; 4046 4047 ops = macsec_get_ops(netdev_priv(dev), &ctx); 4048 if (!ops) { 4049 ret = -EOPNOTSUPP; 4050 goto cleanup; 4051 } 4052 4053 ctx.secy = &macsec->secy; 4054 ret = macsec_offload(ops->mdo_upd_secy, &ctx); 4055 if (ret) 4056 goto cleanup; 4057 } 4058 4059 return 0; 4060 4061 cleanup: 4062 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc)); 4063 memcpy(&macsec->secy, &secy, sizeof(secy)); 4064 4065 return ret; 4066 } 4067 4068 static void macsec_del_dev(struct macsec_dev *macsec) 4069 { 4070 int i; 4071 4072 while (macsec->secy.rx_sc) { 4073 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 4074 4075 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 4076 free_rx_sc(rx_sc); 4077 } 4078 4079 for (i = 0; i < MACSEC_NUM_AN; i++) { 4080 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 4081 4082 if (sa) { 4083 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 4084 clear_tx_sa(sa); 4085 } 4086 } 4087 } 4088 4089 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 4090 { 4091 struct macsec_dev *macsec = macsec_priv(dev); 4092 struct net_device *real_dev = macsec->real_dev; 4093 4094 /* If h/w offloading is available, propagate to the device */ 4095 if (macsec_is_offloaded(macsec)) { 4096 const struct macsec_ops *ops; 4097 struct macsec_context ctx; 4098 4099 ops = macsec_get_ops(netdev_priv(dev), &ctx); 4100 if (ops) { 4101 ctx.secy = &macsec->secy; 4102 macsec_offload(ops->mdo_del_secy, &ctx); 4103 } 4104 } 4105 4106 unregister_netdevice_queue(dev, head); 4107 list_del_rcu(&macsec->secys); 4108 macsec_del_dev(macsec); 4109 netdev_upper_dev_unlink(real_dev, dev); 4110 4111 macsec_generation++; 4112 } 4113 4114 static void macsec_dellink(struct net_device *dev, struct list_head *head) 4115 { 4116 struct macsec_dev *macsec = macsec_priv(dev); 4117 struct net_device *real_dev = macsec->real_dev; 4118 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 4119 4120 macsec_common_dellink(dev, head); 4121 4122 if (list_empty(&rxd->secys)) { 4123 netdev_rx_handler_unregister(real_dev); 4124 kfree(rxd); 4125 } 4126 } 4127 4128 static int register_macsec_dev(struct net_device *real_dev, 4129 struct net_device *dev) 4130 { 4131 struct macsec_dev *macsec = macsec_priv(dev); 4132 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 4133 4134 if (!rxd) { 4135 int err; 4136 4137 rxd = kmalloc_obj(*rxd); 4138 if (!rxd) 4139 return -ENOMEM; 4140 4141 INIT_LIST_HEAD(&rxd->secys); 4142 4143 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 4144 rxd); 4145 if (err < 0) { 4146 kfree(rxd); 4147 return err; 4148 } 4149 } 4150 4151 list_add_tail_rcu(&macsec->secys, &rxd->secys); 4152 return 0; 4153 } 4154 4155 static bool sci_exists(struct net_device *dev, sci_t sci) 4156 { 4157 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 4158 struct macsec_dev *macsec; 4159 4160 list_for_each_entry(macsec, &rxd->secys, secys) { 4161 if (macsec->secy.sci == sci) 4162 return true; 4163 } 4164 4165 return false; 4166 } 4167 4168 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 4169 { 4170 return make_sci(dev->dev_addr, port); 4171 } 4172 4173 static void macsec_init_secy(struct net_device *dev, sci_t sci, u8 icv_len) 4174 { 4175 struct macsec_dev *macsec = macsec_priv(dev); 4176 struct macsec_secy *secy = &macsec->secy; 4177 4178 if (sci == MACSEC_UNDEF_SCI) 4179 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4180 4181 secy->netdev = dev; 4182 secy->operational = true; 4183 secy->key_len = DEFAULT_SAK_LEN; 4184 secy->icv_len = icv_len; 4185 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 4186 secy->protect_frames = true; 4187 secy->replay_protect = false; 4188 secy->xpn = DEFAULT_XPN; 4189 4190 secy->sci = sci; 4191 secy->tx_sc.active = true; 4192 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 4193 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 4194 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 4195 secy->tx_sc.end_station = false; 4196 secy->tx_sc.scb = false; 4197 } 4198 4199 static struct lock_class_key macsec_netdev_addr_lock_key; 4200 4201 static int macsec_newlink(struct net_device *dev, 4202 struct rtnl_newlink_params *params, 4203 struct netlink_ext_ack *extack) 4204 { 4205 struct net *link_net = rtnl_newlink_link_net(params); 4206 struct macsec_dev *macsec = macsec_priv(dev); 4207 struct nlattr **data = params->data; 4208 struct nlattr **tb = params->tb; 4209 rx_handler_func_t *rx_handler; 4210 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4211 struct net_device *real_dev; 4212 int err, mtu; 4213 sci_t sci; 4214 4215 if (!tb[IFLA_LINK]) 4216 return -EINVAL; 4217 real_dev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK])); 4218 if (!real_dev) 4219 return -ENODEV; 4220 if (real_dev->type != ARPHRD_ETHER) 4221 return -EINVAL; 4222 4223 dev->priv_flags |= IFF_MACSEC; 4224 4225 macsec->real_dev = real_dev; 4226 4227 if (data && data[IFLA_MACSEC_OFFLOAD]) 4228 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]); 4229 else 4230 /* MACsec offloading is off by default */ 4231 macsec->offload = MACSEC_OFFLOAD_OFF; 4232 4233 /* Check if the offloading mode is supported by the underlying layers */ 4234 if (macsec->offload != MACSEC_OFFLOAD_OFF && 4235 !macsec_check_offload(macsec->offload, macsec)) 4236 return -EOPNOTSUPP; 4237 4238 /* send_sci must be set to true when transmit sci explicitly is set */ 4239 if ((data && data[IFLA_MACSEC_SCI]) && 4240 (data && data[IFLA_MACSEC_INC_SCI])) { 4241 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 4242 4243 if (!send_sci) 4244 return -EINVAL; 4245 } 4246 4247 if (data && data[IFLA_MACSEC_ICV_LEN]) 4248 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4249 mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 4250 if (mtu < 0) 4251 dev->mtu = 0; 4252 else 4253 dev->mtu = mtu; 4254 4255 rx_handler = rtnl_dereference(real_dev->rx_handler); 4256 if (rx_handler && rx_handler != macsec_handle_frame) 4257 return -EBUSY; 4258 4259 if (is_zero_ether_addr(dev->dev_addr)) 4260 eth_hw_addr_inherit(dev, real_dev); 4261 4262 if (data && data[IFLA_MACSEC_SCI]) 4263 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 4264 else if (data && data[IFLA_MACSEC_PORT]) 4265 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 4266 else 4267 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4268 4269 /* Registration can notify listeners before returning. */ 4270 macsec_init_secy(dev, sci, icv_len); 4271 if (data) { 4272 err = macsec_changelink_common(dev, data); 4273 if (err) 4274 return err; 4275 } 4276 4277 err = register_netdevice(dev); 4278 if (err < 0) 4279 return err; 4280 4281 netdev_lockdep_set_classes(dev); 4282 lockdep_set_class(&dev->addr_list_lock, 4283 &macsec_netdev_addr_lock_key); 4284 4285 err = netdev_upper_dev_link(real_dev, dev, extack); 4286 if (err < 0) 4287 goto unregister; 4288 4289 if (rx_handler && sci_exists(real_dev, sci)) { 4290 err = -EBUSY; 4291 goto unlink; 4292 } 4293 4294 /* If h/w offloading is available, propagate to the device */ 4295 if (macsec_is_offloaded(macsec)) { 4296 const struct macsec_ops *ops; 4297 struct macsec_context ctx; 4298 4299 ops = macsec_get_ops(macsec, &ctx); 4300 if (ops) { 4301 ctx.secy = &macsec->secy; 4302 err = macsec_offload(ops->mdo_add_secy, &ctx); 4303 if (err) 4304 goto del_dev; 4305 4306 macsec->insert_tx_tag = 4307 macsec_needs_tx_tag(macsec, ops); 4308 } 4309 } 4310 4311 err = register_macsec_dev(real_dev, dev); 4312 if (err < 0) 4313 goto del_dev; 4314 4315 netdev_update_features(dev); 4316 netif_stacked_transfer_operstate(real_dev, dev); 4317 linkwatch_fire_event(dev); 4318 4319 macsec_generation++; 4320 4321 return 0; 4322 4323 del_dev: 4324 macsec_del_dev(macsec); 4325 unlink: 4326 netdev_upper_dev_unlink(real_dev, dev); 4327 unregister: 4328 unregister_netdevice(dev); 4329 return err; 4330 } 4331 4332 static int validate_cipher_suite(const struct nlattr *attr, 4333 struct netlink_ext_ack *extack) 4334 { 4335 switch (nla_get_u64(attr)) { 4336 case MACSEC_CIPHER_ID_GCM_AES_128: 4337 case MACSEC_CIPHER_ID_GCM_AES_256: 4338 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 4339 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 4340 case MACSEC_DEFAULT_CIPHER_ID: 4341 return 0; 4342 default: 4343 return -EINVAL; 4344 } 4345 } 4346 4347 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], 4348 struct netlink_ext_ack *extack) 4349 { 4350 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4351 bool es, scb, sci; 4352 4353 if (!data) 4354 return 0; 4355 4356 if (data[IFLA_MACSEC_ICV_LEN]) { 4357 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4358 if (icv_len != MACSEC_DEFAULT_ICV_LEN) { 4359 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 4360 struct crypto_aead *dummy_tfm; 4361 4362 dummy_tfm = macsec_alloc_tfm(dummy_key, 4363 DEFAULT_SAK_LEN, 4364 icv_len); 4365 if (IS_ERR(dummy_tfm)) 4366 return PTR_ERR(dummy_tfm); 4367 crypto_free_aead(dummy_tfm); 4368 } 4369 } 4370 4371 es = nla_get_u8_default(data[IFLA_MACSEC_ES], false); 4372 sci = nla_get_u8_default(data[IFLA_MACSEC_INC_SCI], false); 4373 scb = nla_get_u8_default(data[IFLA_MACSEC_SCB], false); 4374 4375 if ((sci && (scb || es)) || (scb && es)) 4376 return -EINVAL; 4377 4378 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 4379 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 4380 !data[IFLA_MACSEC_WINDOW]) 4381 return -EINVAL; 4382 4383 return 0; 4384 } 4385 4386 static struct net *macsec_get_link_net(const struct net_device *dev) 4387 { 4388 return dev_net(macsec_priv(dev)->real_dev); 4389 } 4390 4391 struct net_device *macsec_get_real_dev(const struct net_device *dev) 4392 { 4393 return macsec_priv(dev)->real_dev; 4394 } 4395 EXPORT_SYMBOL_GPL(macsec_get_real_dev); 4396 4397 bool macsec_netdev_is_offloaded(struct net_device *dev) 4398 { 4399 return macsec_is_offloaded(macsec_priv(dev)); 4400 } 4401 EXPORT_SYMBOL_GPL(macsec_netdev_is_offloaded); 4402 4403 static size_t macsec_get_size(const struct net_device *dev) 4404 { 4405 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ 4406 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ 4407 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ 4408 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ 4409 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ 4410 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ 4411 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ 4412 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ 4413 nla_total_size(1) + /* IFLA_MACSEC_ES */ 4414 nla_total_size(1) + /* IFLA_MACSEC_SCB */ 4415 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ 4416 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ 4417 nla_total_size(1) + /* IFLA_MACSEC_OFFLOAD */ 4418 0; 4419 } 4420 4421 static int macsec_fill_info(struct sk_buff *skb, 4422 const struct net_device *dev) 4423 { 4424 const struct macsec_tx_sc *tx_sc; 4425 const struct macsec_dev *macsec; 4426 const struct macsec_secy *secy; 4427 u64 csid; 4428 4429 macsec = macsec_priv(dev); 4430 secy = &macsec->secy; 4431 tx_sc = &secy->tx_sc; 4432 4433 switch (READ_ONCE(secy->key_len)) { 4434 case MACSEC_GCM_AES_128_SAK_LEN: 4435 csid = READ_ONCE(secy->xpn) ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 4436 break; 4437 case MACSEC_GCM_AES_256_SAK_LEN: 4438 csid = READ_ONCE(secy->xpn) ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 4439 break; 4440 default: 4441 goto nla_put_failure; 4442 } 4443 4444 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 4445 IFLA_MACSEC_PAD) || 4446 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 4447 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 4448 csid, IFLA_MACSEC_PAD) || 4449 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, READ_ONCE(tx_sc->encoding_sa)) || 4450 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, READ_ONCE(tx_sc->encrypt)) || 4451 nla_put_u8(skb, IFLA_MACSEC_PROTECT, READ_ONCE(secy->protect_frames)) || 4452 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, READ_ONCE(tx_sc->send_sci)) || 4453 nla_put_u8(skb, IFLA_MACSEC_ES, READ_ONCE(tx_sc->end_station)) || 4454 nla_put_u8(skb, IFLA_MACSEC_SCB, READ_ONCE(tx_sc->scb)) || 4455 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, READ_ONCE(secy->replay_protect)) || 4456 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, READ_ONCE(secy->validate_frames)) || 4457 nla_put_u8(skb, IFLA_MACSEC_OFFLOAD, READ_ONCE(macsec->offload)) || 4458 0) 4459 goto nla_put_failure; 4460 4461 if (READ_ONCE(secy->replay_protect)) { 4462 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, READ_ONCE(secy->replay_window))) 4463 goto nla_put_failure; 4464 } 4465 4466 return 0; 4467 4468 nla_put_failure: 4469 return -EMSGSIZE; 4470 } 4471 4472 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 4473 .kind = "macsec", 4474 .priv_size = sizeof(struct macsec_dev), 4475 .maxtype = IFLA_MACSEC_MAX, 4476 .policy = macsec_rtnl_policy, 4477 .setup = macsec_setup, 4478 .validate = macsec_validate_attr, 4479 .newlink = macsec_newlink, 4480 .changelink = macsec_changelink, 4481 .dellink = macsec_dellink, 4482 .get_size = macsec_get_size, 4483 .fill_info = macsec_fill_info, 4484 .get_link_net = macsec_get_link_net, 4485 }; 4486 4487 static bool is_macsec_master(struct net_device *dev) 4488 { 4489 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 4490 } 4491 4492 static int macsec_notify(struct notifier_block *this, unsigned long event, 4493 void *ptr) 4494 { 4495 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 4496 struct macsec_rxh_data *rxd; 4497 struct macsec_dev *m, *n; 4498 LIST_HEAD(head); 4499 4500 if (!is_macsec_master(real_dev)) 4501 return NOTIFY_DONE; 4502 4503 rxd = macsec_data_rtnl(real_dev); 4504 4505 switch (event) { 4506 case NETDEV_DOWN: 4507 case NETDEV_UP: 4508 case NETDEV_CHANGE: 4509 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4510 struct net_device *dev = m->secy.netdev; 4511 4512 netif_stacked_transfer_operstate(real_dev, dev); 4513 } 4514 break; 4515 case NETDEV_UNREGISTER: 4516 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4517 macsec_common_dellink(m->secy.netdev, &head); 4518 } 4519 4520 netdev_rx_handler_unregister(real_dev); 4521 kfree(rxd); 4522 4523 unregister_netdevice_many(&head); 4524 break; 4525 case NETDEV_CHANGEMTU: 4526 list_for_each_entry(m, &rxd->secys, secys) { 4527 struct net_device *dev = m->secy.netdev; 4528 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 4529 macsec_extra_len(true)); 4530 4531 if (dev->mtu > mtu) 4532 dev_set_mtu(dev, mtu); 4533 } 4534 break; 4535 case NETDEV_FEAT_CHANGE: 4536 list_for_each_entry(m, &rxd->secys, secys) { 4537 macsec_inherit_tso_max(m->secy.netdev); 4538 netdev_update_features(m->secy.netdev); 4539 } 4540 break; 4541 } 4542 4543 return NOTIFY_OK; 4544 } 4545 4546 static struct notifier_block macsec_notifier = { 4547 .notifier_call = macsec_notify, 4548 }; 4549 4550 static int __init macsec_init(void) 4551 { 4552 int err; 4553 4554 macsec_wq = alloc_workqueue("macsec", WQ_UNBOUND, 0); 4555 if (!macsec_wq) 4556 return -ENOMEM; 4557 4558 pr_info("MACsec IEEE 802.1AE\n"); 4559 err = register_netdevice_notifier(&macsec_notifier); 4560 if (err) 4561 goto err_destroy_wq; 4562 4563 err = rtnl_link_register(&macsec_link_ops); 4564 if (err) 4565 goto err_notifier; 4566 4567 err = genl_register_family(&macsec_fam); 4568 if (err) 4569 goto err_rtnl; 4570 4571 return 0; 4572 4573 err_rtnl: 4574 rtnl_link_unregister(&macsec_link_ops); 4575 err_notifier: 4576 unregister_netdevice_notifier(&macsec_notifier); 4577 err_destroy_wq: 4578 /* Precautionary, mirrors macsec_exit() to stay safe if work 4579 * ever becomes queueable before this point in the future. 4580 */ 4581 rcu_barrier(); 4582 destroy_workqueue(macsec_wq); 4583 return err; 4584 } 4585 4586 static void __exit macsec_exit(void) 4587 { 4588 genl_unregister_family(&macsec_fam); 4589 rtnl_link_unregister(&macsec_link_ops); 4590 unregister_netdevice_notifier(&macsec_notifier); 4591 rcu_barrier(); 4592 destroy_workqueue(macsec_wq); 4593 } 4594 4595 module_init(macsec_init); 4596 module_exit(macsec_exit); 4597 4598 MODULE_ALIAS_RTNL_LINK("macsec"); 4599 MODULE_ALIAS_GENL_FAMILY("macsec"); 4600 4601 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 4602 MODULE_LICENSE("GPL v2"); 4603