1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * drivers/net/macsec.c - MACsec device 4 * 5 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net> 6 */ 7 8 #include <linux/types.h> 9 #include <linux/skbuff.h> 10 #include <linux/socket.h> 11 #include <linux/module.h> 12 #include <crypto/aead.h> 13 #include <linux/etherdevice.h> 14 #include <linux/netdevice.h> 15 #include <linux/rtnetlink.h> 16 #include <linux/refcount.h> 17 #include <net/genetlink.h> 18 #include <net/sock.h> 19 #include <net/gro_cells.h> 20 #include <net/macsec.h> 21 #include <linux/phy.h> 22 23 #include <uapi/linux/if_macsec.h> 24 25 #define MACSEC_SCI_LEN 8 26 27 /* SecTAG length = macsec_eth_header without the optional SCI */ 28 #define MACSEC_TAG_LEN 6 29 30 struct macsec_eth_header { 31 struct ethhdr eth; 32 /* SecTAG */ 33 u8 tci_an; 34 #if defined(__LITTLE_ENDIAN_BITFIELD) 35 u8 short_length:6, 36 unused:2; 37 #elif defined(__BIG_ENDIAN_BITFIELD) 38 u8 unused:2, 39 short_length:6; 40 #else 41 #error "Please fix <asm/byteorder.h>" 42 #endif 43 __be32 packet_number; 44 u8 secure_channel_id[8]; /* optional */ 45 } __packed; 46 47 #define MACSEC_TCI_VERSION 0x80 48 #define MACSEC_TCI_ES 0x40 /* end station */ 49 #define MACSEC_TCI_SC 0x20 /* SCI present */ 50 #define MACSEC_TCI_SCB 0x10 /* epon */ 51 #define MACSEC_TCI_E 0x08 /* encryption */ 52 #define MACSEC_TCI_C 0x04 /* changed text */ 53 #define MACSEC_AN_MASK 0x03 /* association number */ 54 #define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C) 55 56 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */ 57 #define MIN_NON_SHORT_LEN 48 58 59 #define GCM_AES_IV_LEN 12 60 #define DEFAULT_ICV_LEN 16 61 62 #define for_each_rxsc(secy, sc) \ 63 for (sc = rcu_dereference_bh(secy->rx_sc); \ 64 sc; \ 65 sc = rcu_dereference_bh(sc->next)) 66 #define for_each_rxsc_rtnl(secy, sc) \ 67 for (sc = rtnl_dereference(secy->rx_sc); \ 68 sc; \ 69 sc = rtnl_dereference(sc->next)) 70 71 struct gcm_iv { 72 union { 73 u8 secure_channel_id[8]; 74 sci_t sci; 75 }; 76 __be32 pn; 77 }; 78 79 struct macsec_dev_stats { 80 __u64 OutPktsUntagged; 81 __u64 InPktsUntagged; 82 __u64 OutPktsTooLong; 83 __u64 InPktsNoTag; 84 __u64 InPktsBadTag; 85 __u64 InPktsUnknownSCI; 86 __u64 InPktsNoSCI; 87 __u64 InPktsOverrun; 88 }; 89 90 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT 91 92 struct pcpu_secy_stats { 93 struct macsec_dev_stats stats; 94 struct u64_stats_sync syncp; 95 }; 96 97 /** 98 * struct macsec_dev - private data 99 * @secy: SecY config 100 * @real_dev: pointer to underlying netdevice 101 * @stats: MACsec device stats 102 * @secys: linked list of SecY's on the underlying device 103 * @offload: status of offloading on the MACsec device 104 */ 105 struct macsec_dev { 106 struct macsec_secy secy; 107 struct net_device *real_dev; 108 struct pcpu_secy_stats __percpu *stats; 109 struct list_head secys; 110 struct gro_cells gro_cells; 111 enum macsec_offload offload; 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(struct rcu_head *head) 181 { 182 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu); 183 184 crypto_free_aead(sa->key.tfm); 185 free_percpu(sa->stats); 186 kfree(sa); 187 } 188 189 static void macsec_rxsa_put(struct macsec_rx_sa *sa) 190 { 191 if (refcount_dec_and_test(&sa->refcnt)) 192 call_rcu(&sa->rcu, free_rxsa); 193 } 194 195 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr) 196 { 197 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr); 198 199 if (!sa || !sa->active) 200 return NULL; 201 202 if (!refcount_inc_not_zero(&sa->refcnt)) 203 return NULL; 204 205 return sa; 206 } 207 208 static void free_txsa(struct rcu_head *head) 209 { 210 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu); 211 212 crypto_free_aead(sa->key.tfm); 213 free_percpu(sa->stats); 214 kfree(sa); 215 } 216 217 static void macsec_txsa_put(struct macsec_tx_sa *sa) 218 { 219 if (refcount_dec_and_test(&sa->refcnt)) 220 call_rcu(&sa->rcu, free_txsa); 221 } 222 223 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) 224 { 225 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); 226 return (struct macsec_cb *)skb->cb; 227 } 228 229 #define MACSEC_PORT_ES (htons(0x0001)) 230 #define MACSEC_PORT_SCB (0x0000) 231 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL) 232 233 #define MACSEC_GCM_AES_128_SAK_LEN 16 234 #define MACSEC_GCM_AES_256_SAK_LEN 32 235 236 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN 237 #define DEFAULT_SEND_SCI true 238 #define DEFAULT_ENCRYPT false 239 #define DEFAULT_ENCODING_SA 0 240 241 static bool send_sci(const struct macsec_secy *secy) 242 { 243 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 244 245 return tx_sc->send_sci || 246 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb); 247 } 248 249 static sci_t make_sci(u8 *addr, __be16 port) 250 { 251 sci_t sci; 252 253 memcpy(&sci, addr, ETH_ALEN); 254 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); 255 256 return sci; 257 } 258 259 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present) 260 { 261 sci_t sci; 262 263 if (sci_present) 264 memcpy(&sci, hdr->secure_channel_id, 265 sizeof(hdr->secure_channel_id)); 266 else 267 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); 268 269 return sci; 270 } 271 272 static unsigned int macsec_sectag_len(bool sci_present) 273 { 274 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); 275 } 276 277 static unsigned int macsec_hdr_len(bool sci_present) 278 { 279 return macsec_sectag_len(sci_present) + ETH_HLEN; 280 } 281 282 static unsigned int macsec_extra_len(bool sci_present) 283 { 284 return macsec_sectag_len(sci_present) + sizeof(__be16); 285 } 286 287 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ 288 static void macsec_fill_sectag(struct macsec_eth_header *h, 289 const struct macsec_secy *secy, u32 pn, 290 bool sci_present) 291 { 292 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 293 294 memset(&h->tci_an, 0, macsec_sectag_len(sci_present)); 295 h->eth.h_proto = htons(ETH_P_MACSEC); 296 297 if (sci_present) { 298 h->tci_an |= MACSEC_TCI_SC; 299 memcpy(&h->secure_channel_id, &secy->sci, 300 sizeof(h->secure_channel_id)); 301 } else { 302 if (tx_sc->end_station) 303 h->tci_an |= MACSEC_TCI_ES; 304 if (tx_sc->scb) 305 h->tci_an |= MACSEC_TCI_SCB; 306 } 307 308 h->packet_number = htonl(pn); 309 310 /* with GCM, C/E clear for !encrypt, both set for encrypt */ 311 if (tx_sc->encrypt) 312 h->tci_an |= MACSEC_TCI_CONFID; 313 else if (secy->icv_len != DEFAULT_ICV_LEN) 314 h->tci_an |= MACSEC_TCI_C; 315 316 h->tci_an |= tx_sc->encoding_sa; 317 } 318 319 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) 320 { 321 if (data_len < MIN_NON_SHORT_LEN) 322 h->short_length = data_len; 323 } 324 325 /* Checks if a MACsec interface is being offloaded to an hardware engine */ 326 static bool macsec_is_offloaded(struct macsec_dev *macsec) 327 { 328 if (macsec->offload == MACSEC_OFFLOAD_PHY) 329 return true; 330 331 return false; 332 } 333 334 /* Checks if underlying layers implement MACsec offloading functions. */ 335 static bool macsec_check_offload(enum macsec_offload offload, 336 struct macsec_dev *macsec) 337 { 338 if (!macsec || !macsec->real_dev) 339 return false; 340 341 if (offload == MACSEC_OFFLOAD_PHY) 342 return macsec->real_dev->phydev && 343 macsec->real_dev->phydev->macsec_ops; 344 345 return false; 346 } 347 348 static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload, 349 struct macsec_dev *macsec, 350 struct macsec_context *ctx) 351 { 352 if (ctx) { 353 memset(ctx, 0, sizeof(*ctx)); 354 ctx->offload = offload; 355 356 if (offload == MACSEC_OFFLOAD_PHY) 357 ctx->phydev = macsec->real_dev->phydev; 358 } 359 360 return macsec->real_dev->phydev->macsec_ops; 361 } 362 363 /* Returns a pointer to the MACsec ops struct if any and updates the MACsec 364 * context device reference if provided. 365 */ 366 static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec, 367 struct macsec_context *ctx) 368 { 369 if (!macsec_check_offload(macsec->offload, macsec)) 370 return NULL; 371 372 return __macsec_get_ops(macsec->offload, macsec, ctx); 373 } 374 375 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */ 376 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len) 377 { 378 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; 379 int len = skb->len - 2 * ETH_ALEN; 380 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; 381 382 /* a) It comprises at least 17 octets */ 383 if (skb->len <= 16) 384 return false; 385 386 /* b) MACsec EtherType: already checked */ 387 388 /* c) V bit is clear */ 389 if (h->tci_an & MACSEC_TCI_VERSION) 390 return false; 391 392 /* d) ES or SCB => !SC */ 393 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && 394 (h->tci_an & MACSEC_TCI_SC)) 395 return false; 396 397 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ 398 if (h->unused) 399 return false; 400 401 /* rx.pn != 0 (figure 10-5) */ 402 if (!h->packet_number) 403 return false; 404 405 /* length check, f) g) h) i) */ 406 if (h->short_length) 407 return len == extra_len + h->short_length; 408 return len >= extra_len + MIN_NON_SHORT_LEN; 409 } 410 411 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) 412 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN 413 414 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) 415 { 416 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; 417 418 gcm_iv->sci = sci; 419 gcm_iv->pn = htonl(pn); 420 } 421 422 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) 423 { 424 return (struct macsec_eth_header *)skb_mac_header(skb); 425 } 426 427 static void __macsec_pn_wrapped(struct macsec_secy *secy, 428 struct macsec_tx_sa *tx_sa) 429 { 430 pr_debug("PN wrapped, transitioning to !oper\n"); 431 tx_sa->active = false; 432 if (secy->protect_frames) 433 secy->operational = false; 434 } 435 436 void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa) 437 { 438 spin_lock_bh(&tx_sa->lock); 439 __macsec_pn_wrapped(secy, tx_sa); 440 spin_unlock_bh(&tx_sa->lock); 441 } 442 EXPORT_SYMBOL_GPL(macsec_pn_wrapped); 443 444 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy) 445 { 446 u32 pn; 447 448 spin_lock_bh(&tx_sa->lock); 449 pn = tx_sa->next_pn; 450 451 tx_sa->next_pn++; 452 if (tx_sa->next_pn == 0) 453 __macsec_pn_wrapped(secy, tx_sa); 454 spin_unlock_bh(&tx_sa->lock); 455 456 return pn; 457 } 458 459 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) 460 { 461 struct macsec_dev *macsec = netdev_priv(dev); 462 463 skb->dev = macsec->real_dev; 464 skb_reset_mac_header(skb); 465 skb->protocol = eth_hdr(skb)->h_proto; 466 } 467 468 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, 469 struct macsec_tx_sa *tx_sa) 470 { 471 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); 472 473 u64_stats_update_begin(&txsc_stats->syncp); 474 if (tx_sc->encrypt) { 475 txsc_stats->stats.OutOctetsEncrypted += skb->len; 476 txsc_stats->stats.OutPktsEncrypted++; 477 this_cpu_inc(tx_sa->stats->OutPktsEncrypted); 478 } else { 479 txsc_stats->stats.OutOctetsProtected += skb->len; 480 txsc_stats->stats.OutPktsProtected++; 481 this_cpu_inc(tx_sa->stats->OutPktsProtected); 482 } 483 u64_stats_update_end(&txsc_stats->syncp); 484 } 485 486 static void count_tx(struct net_device *dev, int ret, int len) 487 { 488 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 489 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 490 491 u64_stats_update_begin(&stats->syncp); 492 stats->tx_packets++; 493 stats->tx_bytes += len; 494 u64_stats_update_end(&stats->syncp); 495 } 496 } 497 498 static void macsec_encrypt_done(struct crypto_async_request *base, int err) 499 { 500 struct sk_buff *skb = base->data; 501 struct net_device *dev = skb->dev; 502 struct macsec_dev *macsec = macsec_priv(dev); 503 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 504 int len, ret; 505 506 aead_request_free(macsec_skb_cb(skb)->req); 507 508 rcu_read_lock_bh(); 509 macsec_encrypt_finish(skb, dev); 510 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 511 len = skb->len; 512 ret = dev_queue_xmit(skb); 513 count_tx(dev, ret, len); 514 rcu_read_unlock_bh(); 515 516 macsec_txsa_put(sa); 517 dev_put(dev); 518 } 519 520 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, 521 unsigned char **iv, 522 struct scatterlist **sg, 523 int num_frags) 524 { 525 size_t size, iv_offset, sg_offset; 526 struct aead_request *req; 527 void *tmp; 528 529 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); 530 iv_offset = size; 531 size += GCM_AES_IV_LEN; 532 533 size = ALIGN(size, __alignof__(struct scatterlist)); 534 sg_offset = size; 535 size += sizeof(struct scatterlist) * num_frags; 536 537 tmp = kmalloc(size, GFP_ATOMIC); 538 if (!tmp) 539 return NULL; 540 541 *iv = (unsigned char *)(tmp + iv_offset); 542 *sg = (struct scatterlist *)(tmp + sg_offset); 543 req = tmp; 544 545 aead_request_set_tfm(req, tfm); 546 547 return req; 548 } 549 550 static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 551 struct net_device *dev) 552 { 553 int ret; 554 struct scatterlist *sg; 555 struct sk_buff *trailer; 556 unsigned char *iv; 557 struct ethhdr *eth; 558 struct macsec_eth_header *hh; 559 size_t unprotected_len; 560 struct aead_request *req; 561 struct macsec_secy *secy; 562 struct macsec_tx_sc *tx_sc; 563 struct macsec_tx_sa *tx_sa; 564 struct macsec_dev *macsec = macsec_priv(dev); 565 bool sci_present; 566 u32 pn; 567 568 secy = &macsec->secy; 569 tx_sc = &secy->tx_sc; 570 571 /* 10.5.1 TX SA assignment */ 572 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); 573 if (!tx_sa) { 574 secy->operational = false; 575 kfree_skb(skb); 576 return ERR_PTR(-EINVAL); 577 } 578 579 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || 580 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { 581 struct sk_buff *nskb = skb_copy_expand(skb, 582 MACSEC_NEEDED_HEADROOM, 583 MACSEC_NEEDED_TAILROOM, 584 GFP_ATOMIC); 585 if (likely(nskb)) { 586 consume_skb(skb); 587 skb = nskb; 588 } else { 589 macsec_txsa_put(tx_sa); 590 kfree_skb(skb); 591 return ERR_PTR(-ENOMEM); 592 } 593 } else { 594 skb = skb_unshare(skb, GFP_ATOMIC); 595 if (!skb) { 596 macsec_txsa_put(tx_sa); 597 return ERR_PTR(-ENOMEM); 598 } 599 } 600 601 unprotected_len = skb->len; 602 eth = eth_hdr(skb); 603 sci_present = send_sci(secy); 604 hh = skb_push(skb, macsec_extra_len(sci_present)); 605 memmove(hh, eth, 2 * ETH_ALEN); 606 607 pn = tx_sa_update_pn(tx_sa, secy); 608 if (pn == 0) { 609 macsec_txsa_put(tx_sa); 610 kfree_skb(skb); 611 return ERR_PTR(-ENOLINK); 612 } 613 macsec_fill_sectag(hh, secy, pn, sci_present); 614 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); 615 616 skb_put(skb, secy->icv_len); 617 618 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { 619 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 620 621 u64_stats_update_begin(&secy_stats->syncp); 622 secy_stats->stats.OutPktsTooLong++; 623 u64_stats_update_end(&secy_stats->syncp); 624 625 macsec_txsa_put(tx_sa); 626 kfree_skb(skb); 627 return ERR_PTR(-EINVAL); 628 } 629 630 ret = skb_cow_data(skb, 0, &trailer); 631 if (unlikely(ret < 0)) { 632 macsec_txsa_put(tx_sa); 633 kfree_skb(skb); 634 return ERR_PTR(ret); 635 } 636 637 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret); 638 if (!req) { 639 macsec_txsa_put(tx_sa); 640 kfree_skb(skb); 641 return ERR_PTR(-ENOMEM); 642 } 643 644 macsec_fill_iv(iv, secy->sci, pn); 645 646 sg_init_table(sg, ret); 647 ret = skb_to_sgvec(skb, sg, 0, skb->len); 648 if (unlikely(ret < 0)) { 649 aead_request_free(req); 650 macsec_txsa_put(tx_sa); 651 kfree_skb(skb); 652 return ERR_PTR(ret); 653 } 654 655 if (tx_sc->encrypt) { 656 int len = skb->len - macsec_hdr_len(sci_present) - 657 secy->icv_len; 658 aead_request_set_crypt(req, sg, sg, len, iv); 659 aead_request_set_ad(req, macsec_hdr_len(sci_present)); 660 } else { 661 aead_request_set_crypt(req, sg, sg, 0, iv); 662 aead_request_set_ad(req, skb->len - secy->icv_len); 663 } 664 665 macsec_skb_cb(skb)->req = req; 666 macsec_skb_cb(skb)->tx_sa = tx_sa; 667 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 668 669 dev_hold(skb->dev); 670 ret = crypto_aead_encrypt(req); 671 if (ret == -EINPROGRESS) { 672 return ERR_PTR(ret); 673 } else if (ret != 0) { 674 dev_put(skb->dev); 675 kfree_skb(skb); 676 aead_request_free(req); 677 macsec_txsa_put(tx_sa); 678 return ERR_PTR(-EINVAL); 679 } 680 681 dev_put(skb->dev); 682 aead_request_free(req); 683 macsec_txsa_put(tx_sa); 684 685 return skb; 686 } 687 688 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 689 { 690 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 691 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 692 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 693 u32 lowest_pn = 0; 694 695 spin_lock(&rx_sa->lock); 696 if (rx_sa->next_pn >= secy->replay_window) 697 lowest_pn = rx_sa->next_pn - secy->replay_window; 698 699 /* Now perform replay protection check again 700 * (see IEEE 802.1AE-2006 figure 10-5) 701 */ 702 if (secy->replay_protect && pn < lowest_pn) { 703 spin_unlock(&rx_sa->lock); 704 u64_stats_update_begin(&rxsc_stats->syncp); 705 rxsc_stats->stats.InPktsLate++; 706 u64_stats_update_end(&rxsc_stats->syncp); 707 return false; 708 } 709 710 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 711 u64_stats_update_begin(&rxsc_stats->syncp); 712 if (hdr->tci_an & MACSEC_TCI_E) 713 rxsc_stats->stats.InOctetsDecrypted += skb->len; 714 else 715 rxsc_stats->stats.InOctetsValidated += skb->len; 716 u64_stats_update_end(&rxsc_stats->syncp); 717 } 718 719 if (!macsec_skb_cb(skb)->valid) { 720 spin_unlock(&rx_sa->lock); 721 722 /* 10.6.5 */ 723 if (hdr->tci_an & MACSEC_TCI_C || 724 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 725 u64_stats_update_begin(&rxsc_stats->syncp); 726 rxsc_stats->stats.InPktsNotValid++; 727 u64_stats_update_end(&rxsc_stats->syncp); 728 return false; 729 } 730 731 u64_stats_update_begin(&rxsc_stats->syncp); 732 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 733 rxsc_stats->stats.InPktsInvalid++; 734 this_cpu_inc(rx_sa->stats->InPktsInvalid); 735 } else if (pn < lowest_pn) { 736 rxsc_stats->stats.InPktsDelayed++; 737 } else { 738 rxsc_stats->stats.InPktsUnchecked++; 739 } 740 u64_stats_update_end(&rxsc_stats->syncp); 741 } else { 742 u64_stats_update_begin(&rxsc_stats->syncp); 743 if (pn < lowest_pn) { 744 rxsc_stats->stats.InPktsDelayed++; 745 } else { 746 rxsc_stats->stats.InPktsOK++; 747 this_cpu_inc(rx_sa->stats->InPktsOK); 748 } 749 u64_stats_update_end(&rxsc_stats->syncp); 750 751 if (pn >= rx_sa->next_pn) 752 rx_sa->next_pn = pn + 1; 753 spin_unlock(&rx_sa->lock); 754 } 755 756 return true; 757 } 758 759 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 760 { 761 skb->pkt_type = PACKET_HOST; 762 skb->protocol = eth_type_trans(skb, dev); 763 764 skb_reset_network_header(skb); 765 if (!skb_transport_header_was_set(skb)) 766 skb_reset_transport_header(skb); 767 skb_reset_mac_len(skb); 768 } 769 770 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 771 { 772 skb->ip_summed = CHECKSUM_NONE; 773 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 774 skb_pull(skb, hdr_len); 775 pskb_trim_unique(skb, skb->len - icv_len); 776 } 777 778 static void count_rx(struct net_device *dev, int len) 779 { 780 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); 781 782 u64_stats_update_begin(&stats->syncp); 783 stats->rx_packets++; 784 stats->rx_bytes += len; 785 u64_stats_update_end(&stats->syncp); 786 } 787 788 static void macsec_decrypt_done(struct crypto_async_request *base, int err) 789 { 790 struct sk_buff *skb = base->data; 791 struct net_device *dev = skb->dev; 792 struct macsec_dev *macsec = macsec_priv(dev); 793 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 794 struct macsec_rx_sc *rx_sc = rx_sa->sc; 795 int len; 796 u32 pn; 797 798 aead_request_free(macsec_skb_cb(skb)->req); 799 800 if (!err) 801 macsec_skb_cb(skb)->valid = true; 802 803 rcu_read_lock_bh(); 804 pn = ntohl(macsec_ethhdr(skb)->packet_number); 805 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 806 rcu_read_unlock_bh(); 807 kfree_skb(skb); 808 goto out; 809 } 810 811 macsec_finalize_skb(skb, macsec->secy.icv_len, 812 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 813 macsec_reset_skb(skb, macsec->secy.netdev); 814 815 len = skb->len; 816 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS) 817 count_rx(dev, len); 818 819 rcu_read_unlock_bh(); 820 821 out: 822 macsec_rxsa_put(rx_sa); 823 macsec_rxsc_put(rx_sc); 824 dev_put(dev); 825 } 826 827 static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 828 struct net_device *dev, 829 struct macsec_rx_sa *rx_sa, 830 sci_t sci, 831 struct macsec_secy *secy) 832 { 833 int ret; 834 struct scatterlist *sg; 835 struct sk_buff *trailer; 836 unsigned char *iv; 837 struct aead_request *req; 838 struct macsec_eth_header *hdr; 839 u16 icv_len = secy->icv_len; 840 841 macsec_skb_cb(skb)->valid = false; 842 skb = skb_share_check(skb, GFP_ATOMIC); 843 if (!skb) 844 return ERR_PTR(-ENOMEM); 845 846 ret = skb_cow_data(skb, 0, &trailer); 847 if (unlikely(ret < 0)) { 848 kfree_skb(skb); 849 return ERR_PTR(ret); 850 } 851 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret); 852 if (!req) { 853 kfree_skb(skb); 854 return ERR_PTR(-ENOMEM); 855 } 856 857 hdr = (struct macsec_eth_header *)skb->data; 858 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number)); 859 860 sg_init_table(sg, ret); 861 ret = skb_to_sgvec(skb, sg, 0, skb->len); 862 if (unlikely(ret < 0)) { 863 aead_request_free(req); 864 kfree_skb(skb); 865 return ERR_PTR(ret); 866 } 867 868 if (hdr->tci_an & MACSEC_TCI_E) { 869 /* confidentiality: ethernet + macsec header 870 * authenticated, encrypted payload 871 */ 872 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 873 874 aead_request_set_crypt(req, sg, sg, len, iv); 875 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 876 skb = skb_unshare(skb, GFP_ATOMIC); 877 if (!skb) { 878 aead_request_free(req); 879 return ERR_PTR(-ENOMEM); 880 } 881 } else { 882 /* integrity only: all headers + data authenticated */ 883 aead_request_set_crypt(req, sg, sg, icv_len, iv); 884 aead_request_set_ad(req, skb->len - icv_len); 885 } 886 887 macsec_skb_cb(skb)->req = req; 888 skb->dev = dev; 889 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 890 891 dev_hold(dev); 892 ret = crypto_aead_decrypt(req); 893 if (ret == -EINPROGRESS) { 894 return ERR_PTR(ret); 895 } else if (ret != 0) { 896 /* decryption/authentication failed 897 * 10.6 if validateFrames is disabled, deliver anyway 898 */ 899 if (ret != -EBADMSG) { 900 kfree_skb(skb); 901 skb = ERR_PTR(ret); 902 } 903 } else { 904 macsec_skb_cb(skb)->valid = true; 905 } 906 dev_put(dev); 907 908 aead_request_free(req); 909 910 return skb; 911 } 912 913 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 914 { 915 struct macsec_rx_sc *rx_sc; 916 917 for_each_rxsc(secy, rx_sc) { 918 if (rx_sc->sci == sci) 919 return rx_sc; 920 } 921 922 return NULL; 923 } 924 925 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 926 { 927 struct macsec_rx_sc *rx_sc; 928 929 for_each_rxsc_rtnl(secy, rx_sc) { 930 if (rx_sc->sci == sci) 931 return rx_sc; 932 } 933 934 return NULL; 935 } 936 937 static enum rx_handler_result handle_not_macsec(struct sk_buff *skb) 938 { 939 /* Deliver to the uncontrolled port by default */ 940 enum rx_handler_result ret = RX_HANDLER_PASS; 941 struct macsec_rxh_data *rxd; 942 struct macsec_dev *macsec; 943 944 rcu_read_lock(); 945 rxd = macsec_data_rcu(skb->dev); 946 947 /* 10.6 If the management control validateFrames is not 948 * Strict, frames without a SecTAG are received, counted, and 949 * delivered to the Controlled Port 950 */ 951 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 952 struct sk_buff *nskb; 953 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 954 955 if (!macsec_is_offloaded(macsec) && 956 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 957 u64_stats_update_begin(&secy_stats->syncp); 958 secy_stats->stats.InPktsNoTag++; 959 u64_stats_update_end(&secy_stats->syncp); 960 continue; 961 } 962 963 /* deliver on this port */ 964 nskb = skb_clone(skb, GFP_ATOMIC); 965 if (!nskb) 966 break; 967 968 nskb->dev = macsec->secy.netdev; 969 970 if (netif_rx(nskb) == NET_RX_SUCCESS) { 971 u64_stats_update_begin(&secy_stats->syncp); 972 secy_stats->stats.InPktsUntagged++; 973 u64_stats_update_end(&secy_stats->syncp); 974 } 975 976 if (netif_running(macsec->secy.netdev) && 977 macsec_is_offloaded(macsec)) { 978 ret = RX_HANDLER_EXACT; 979 goto out; 980 } 981 } 982 983 out: 984 rcu_read_unlock(); 985 return ret; 986 } 987 988 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 989 { 990 struct sk_buff *skb = *pskb; 991 struct net_device *dev = skb->dev; 992 struct macsec_eth_header *hdr; 993 struct macsec_secy *secy = NULL; 994 struct macsec_rx_sc *rx_sc; 995 struct macsec_rx_sa *rx_sa; 996 struct macsec_rxh_data *rxd; 997 struct macsec_dev *macsec; 998 sci_t sci; 999 u32 pn; 1000 bool cbit; 1001 struct pcpu_rx_sc_stats *rxsc_stats; 1002 struct pcpu_secy_stats *secy_stats; 1003 bool pulled_sci; 1004 int ret; 1005 1006 if (skb_headroom(skb) < ETH_HLEN) 1007 goto drop_direct; 1008 1009 hdr = macsec_ethhdr(skb); 1010 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) 1011 return handle_not_macsec(skb); 1012 1013 skb = skb_unshare(skb, GFP_ATOMIC); 1014 *pskb = skb; 1015 if (!skb) 1016 return RX_HANDLER_CONSUMED; 1017 1018 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1019 if (!pulled_sci) { 1020 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1021 goto drop_direct; 1022 } 1023 1024 hdr = macsec_ethhdr(skb); 1025 1026 /* Frames with a SecTAG that has the TCI E bit set but the C 1027 * bit clear are discarded, as this reserved encoding is used 1028 * to identify frames with a SecTAG that are not to be 1029 * delivered to the Controlled Port. 1030 */ 1031 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1032 return RX_HANDLER_PASS; 1033 1034 /* now, pull the extra length */ 1035 if (hdr->tci_an & MACSEC_TCI_SC) { 1036 if (!pulled_sci) 1037 goto drop_direct; 1038 } 1039 1040 /* ethernet header is part of crypto processing */ 1041 skb_push(skb, ETH_HLEN); 1042 1043 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1044 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1045 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci); 1046 1047 rcu_read_lock(); 1048 rxd = macsec_data_rcu(skb->dev); 1049 1050 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1051 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1052 1053 sc = sc ? macsec_rxsc_get(sc) : NULL; 1054 1055 if (sc) { 1056 secy = &macsec->secy; 1057 rx_sc = sc; 1058 break; 1059 } 1060 } 1061 1062 if (!secy) 1063 goto nosci; 1064 1065 dev = secy->netdev; 1066 macsec = macsec_priv(dev); 1067 secy_stats = this_cpu_ptr(macsec->stats); 1068 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1069 1070 if (!macsec_validate_skb(skb, secy->icv_len)) { 1071 u64_stats_update_begin(&secy_stats->syncp); 1072 secy_stats->stats.InPktsBadTag++; 1073 u64_stats_update_end(&secy_stats->syncp); 1074 goto drop_nosa; 1075 } 1076 1077 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1078 if (!rx_sa) { 1079 /* 10.6.1 if the SA is not in use */ 1080 1081 /* If validateFrames is Strict or the C bit in the 1082 * SecTAG is set, discard 1083 */ 1084 if (hdr->tci_an & MACSEC_TCI_C || 1085 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1086 u64_stats_update_begin(&rxsc_stats->syncp); 1087 rxsc_stats->stats.InPktsNotUsingSA++; 1088 u64_stats_update_end(&rxsc_stats->syncp); 1089 goto drop_nosa; 1090 } 1091 1092 /* not Strict, the frame (with the SecTAG and ICV 1093 * removed) is delivered to the Controlled Port. 1094 */ 1095 u64_stats_update_begin(&rxsc_stats->syncp); 1096 rxsc_stats->stats.InPktsUnusedSA++; 1097 u64_stats_update_end(&rxsc_stats->syncp); 1098 goto deliver; 1099 } 1100 1101 /* First, PN check to avoid decrypting obviously wrong packets */ 1102 pn = ntohl(hdr->packet_number); 1103 if (secy->replay_protect) { 1104 bool late; 1105 1106 spin_lock(&rx_sa->lock); 1107 late = rx_sa->next_pn >= secy->replay_window && 1108 pn < (rx_sa->next_pn - secy->replay_window); 1109 spin_unlock(&rx_sa->lock); 1110 1111 if (late) { 1112 u64_stats_update_begin(&rxsc_stats->syncp); 1113 rxsc_stats->stats.InPktsLate++; 1114 u64_stats_update_end(&rxsc_stats->syncp); 1115 goto drop; 1116 } 1117 } 1118 1119 macsec_skb_cb(skb)->rx_sa = rx_sa; 1120 1121 /* Disabled && !changed text => skip validation */ 1122 if (hdr->tci_an & MACSEC_TCI_C || 1123 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1124 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1125 1126 if (IS_ERR(skb)) { 1127 /* the decrypt callback needs the reference */ 1128 if (PTR_ERR(skb) != -EINPROGRESS) { 1129 macsec_rxsa_put(rx_sa); 1130 macsec_rxsc_put(rx_sc); 1131 } 1132 rcu_read_unlock(); 1133 *pskb = NULL; 1134 return RX_HANDLER_CONSUMED; 1135 } 1136 1137 if (!macsec_post_decrypt(skb, secy, pn)) 1138 goto drop; 1139 1140 deliver: 1141 macsec_finalize_skb(skb, secy->icv_len, 1142 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1143 macsec_reset_skb(skb, secy->netdev); 1144 1145 if (rx_sa) 1146 macsec_rxsa_put(rx_sa); 1147 macsec_rxsc_put(rx_sc); 1148 1149 skb_orphan(skb); 1150 ret = gro_cells_receive(&macsec->gro_cells, skb); 1151 if (ret == NET_RX_SUCCESS) 1152 count_rx(dev, skb->len); 1153 else 1154 macsec->secy.netdev->stats.rx_dropped++; 1155 1156 rcu_read_unlock(); 1157 1158 *pskb = NULL; 1159 return RX_HANDLER_CONSUMED; 1160 1161 drop: 1162 macsec_rxsa_put(rx_sa); 1163 drop_nosa: 1164 macsec_rxsc_put(rx_sc); 1165 rcu_read_unlock(); 1166 drop_direct: 1167 kfree_skb(skb); 1168 *pskb = NULL; 1169 return RX_HANDLER_CONSUMED; 1170 1171 nosci: 1172 /* 10.6.1 if the SC is not found */ 1173 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1174 if (!cbit) 1175 macsec_finalize_skb(skb, DEFAULT_ICV_LEN, 1176 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1177 1178 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1179 struct sk_buff *nskb; 1180 1181 secy_stats = this_cpu_ptr(macsec->stats); 1182 1183 /* If validateFrames is Strict or the C bit in the 1184 * SecTAG is set, discard 1185 */ 1186 if (cbit || 1187 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1188 u64_stats_update_begin(&secy_stats->syncp); 1189 secy_stats->stats.InPktsNoSCI++; 1190 u64_stats_update_end(&secy_stats->syncp); 1191 continue; 1192 } 1193 1194 /* not strict, the frame (with the SecTAG and ICV 1195 * removed) is delivered to the Controlled Port. 1196 */ 1197 nskb = skb_clone(skb, GFP_ATOMIC); 1198 if (!nskb) 1199 break; 1200 1201 macsec_reset_skb(nskb, macsec->secy.netdev); 1202 1203 ret = netif_rx(nskb); 1204 if (ret == NET_RX_SUCCESS) { 1205 u64_stats_update_begin(&secy_stats->syncp); 1206 secy_stats->stats.InPktsUnknownSCI++; 1207 u64_stats_update_end(&secy_stats->syncp); 1208 } else { 1209 macsec->secy.netdev->stats.rx_dropped++; 1210 } 1211 } 1212 1213 rcu_read_unlock(); 1214 *pskb = skb; 1215 return RX_HANDLER_PASS; 1216 } 1217 1218 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1219 { 1220 struct crypto_aead *tfm; 1221 int ret; 1222 1223 tfm = crypto_alloc_aead("gcm(aes)", 0, 0); 1224 1225 if (IS_ERR(tfm)) 1226 return tfm; 1227 1228 ret = crypto_aead_setkey(tfm, key, key_len); 1229 if (ret < 0) 1230 goto fail; 1231 1232 ret = crypto_aead_setauthsize(tfm, icv_len); 1233 if (ret < 0) 1234 goto fail; 1235 1236 return tfm; 1237 fail: 1238 crypto_free_aead(tfm); 1239 return ERR_PTR(ret); 1240 } 1241 1242 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1243 int icv_len) 1244 { 1245 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1246 if (!rx_sa->stats) 1247 return -ENOMEM; 1248 1249 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1250 if (IS_ERR(rx_sa->key.tfm)) { 1251 free_percpu(rx_sa->stats); 1252 return PTR_ERR(rx_sa->key.tfm); 1253 } 1254 1255 rx_sa->active = false; 1256 rx_sa->next_pn = 1; 1257 refcount_set(&rx_sa->refcnt, 1); 1258 spin_lock_init(&rx_sa->lock); 1259 1260 return 0; 1261 } 1262 1263 static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1264 { 1265 rx_sa->active = false; 1266 1267 macsec_rxsa_put(rx_sa); 1268 } 1269 1270 static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1271 { 1272 int i; 1273 1274 for (i = 0; i < MACSEC_NUM_AN; i++) { 1275 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1276 1277 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1278 if (sa) 1279 clear_rx_sa(sa); 1280 } 1281 1282 macsec_rxsc_put(rx_sc); 1283 } 1284 1285 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1286 { 1287 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1288 1289 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1290 rx_sc; 1291 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1292 if (rx_sc->sci == sci) { 1293 if (rx_sc->active) 1294 secy->n_rx_sc--; 1295 rcu_assign_pointer(*rx_scp, rx_sc->next); 1296 return rx_sc; 1297 } 1298 } 1299 1300 return NULL; 1301 } 1302 1303 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci) 1304 { 1305 struct macsec_rx_sc *rx_sc; 1306 struct macsec_dev *macsec; 1307 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1308 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1309 struct macsec_secy *secy; 1310 1311 list_for_each_entry(macsec, &rxd->secys, secys) { 1312 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1313 return ERR_PTR(-EEXIST); 1314 } 1315 1316 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL); 1317 if (!rx_sc) 1318 return ERR_PTR(-ENOMEM); 1319 1320 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1321 if (!rx_sc->stats) { 1322 kfree(rx_sc); 1323 return ERR_PTR(-ENOMEM); 1324 } 1325 1326 rx_sc->sci = sci; 1327 rx_sc->active = true; 1328 refcount_set(&rx_sc->refcnt, 1); 1329 1330 secy = &macsec_priv(dev)->secy; 1331 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1332 rcu_assign_pointer(secy->rx_sc, rx_sc); 1333 1334 if (rx_sc->active) 1335 secy->n_rx_sc++; 1336 1337 return rx_sc; 1338 } 1339 1340 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1341 int icv_len) 1342 { 1343 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1344 if (!tx_sa->stats) 1345 return -ENOMEM; 1346 1347 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1348 if (IS_ERR(tx_sa->key.tfm)) { 1349 free_percpu(tx_sa->stats); 1350 return PTR_ERR(tx_sa->key.tfm); 1351 } 1352 1353 tx_sa->active = false; 1354 refcount_set(&tx_sa->refcnt, 1); 1355 spin_lock_init(&tx_sa->lock); 1356 1357 return 0; 1358 } 1359 1360 static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1361 { 1362 tx_sa->active = false; 1363 1364 macsec_txsa_put(tx_sa); 1365 } 1366 1367 static struct genl_family macsec_fam; 1368 1369 static struct net_device *get_dev_from_nl(struct net *net, 1370 struct nlattr **attrs) 1371 { 1372 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1373 struct net_device *dev; 1374 1375 dev = __dev_get_by_index(net, ifindex); 1376 if (!dev) 1377 return ERR_PTR(-ENODEV); 1378 1379 if (!netif_is_macsec(dev)) 1380 return ERR_PTR(-ENODEV); 1381 1382 return dev; 1383 } 1384 1385 static sci_t nla_get_sci(const struct nlattr *nla) 1386 { 1387 return (__force sci_t)nla_get_u64(nla); 1388 } 1389 1390 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, 1391 int padattr) 1392 { 1393 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); 1394 } 1395 1396 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1397 struct nlattr **attrs, 1398 struct nlattr **tb_sa, 1399 struct net_device **devp, 1400 struct macsec_secy **secyp, 1401 struct macsec_tx_sc **scp, 1402 u8 *assoc_num) 1403 { 1404 struct net_device *dev; 1405 struct macsec_secy *secy; 1406 struct macsec_tx_sc *tx_sc; 1407 struct macsec_tx_sa *tx_sa; 1408 1409 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1410 return ERR_PTR(-EINVAL); 1411 1412 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1413 1414 dev = get_dev_from_nl(net, attrs); 1415 if (IS_ERR(dev)) 1416 return ERR_CAST(dev); 1417 1418 if (*assoc_num >= MACSEC_NUM_AN) 1419 return ERR_PTR(-EINVAL); 1420 1421 secy = &macsec_priv(dev)->secy; 1422 tx_sc = &secy->tx_sc; 1423 1424 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1425 if (!tx_sa) 1426 return ERR_PTR(-ENODEV); 1427 1428 *devp = dev; 1429 *scp = tx_sc; 1430 *secyp = secy; 1431 return tx_sa; 1432 } 1433 1434 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1435 struct nlattr **attrs, 1436 struct nlattr **tb_rxsc, 1437 struct net_device **devp, 1438 struct macsec_secy **secyp) 1439 { 1440 struct net_device *dev; 1441 struct macsec_secy *secy; 1442 struct macsec_rx_sc *rx_sc; 1443 sci_t sci; 1444 1445 dev = get_dev_from_nl(net, attrs); 1446 if (IS_ERR(dev)) 1447 return ERR_CAST(dev); 1448 1449 secy = &macsec_priv(dev)->secy; 1450 1451 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1452 return ERR_PTR(-EINVAL); 1453 1454 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1455 rx_sc = find_rx_sc_rtnl(secy, sci); 1456 if (!rx_sc) 1457 return ERR_PTR(-ENODEV); 1458 1459 *secyp = secy; 1460 *devp = dev; 1461 1462 return rx_sc; 1463 } 1464 1465 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1466 struct nlattr **attrs, 1467 struct nlattr **tb_rxsc, 1468 struct nlattr **tb_sa, 1469 struct net_device **devp, 1470 struct macsec_secy **secyp, 1471 struct macsec_rx_sc **scp, 1472 u8 *assoc_num) 1473 { 1474 struct macsec_rx_sc *rx_sc; 1475 struct macsec_rx_sa *rx_sa; 1476 1477 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1478 return ERR_PTR(-EINVAL); 1479 1480 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1481 if (*assoc_num >= MACSEC_NUM_AN) 1482 return ERR_PTR(-EINVAL); 1483 1484 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1485 if (IS_ERR(rx_sc)) 1486 return ERR_CAST(rx_sc); 1487 1488 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1489 if (!rx_sa) 1490 return ERR_PTR(-ENODEV); 1491 1492 *scp = rx_sc; 1493 return rx_sa; 1494 } 1495 1496 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1497 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1498 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1499 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1500 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED }, 1501 }; 1502 1503 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1504 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1505 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, 1506 }; 1507 1508 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1509 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, 1510 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, 1511 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 }, 1512 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY, 1513 .len = MACSEC_KEYID_LEN, }, 1514 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1515 .len = MACSEC_MAX_KEY_LEN, }, 1516 }; 1517 1518 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = { 1519 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 }, 1520 }; 1521 1522 /* Offloads an operation to a device driver */ 1523 static int macsec_offload(int (* const func)(struct macsec_context *), 1524 struct macsec_context *ctx) 1525 { 1526 int ret; 1527 1528 if (unlikely(!func)) 1529 return 0; 1530 1531 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1532 mutex_lock(&ctx->phydev->lock); 1533 1534 /* Phase I: prepare. The drive should fail here if there are going to be 1535 * issues in the commit phase. 1536 */ 1537 ctx->prepare = true; 1538 ret = (*func)(ctx); 1539 if (ret) 1540 goto phy_unlock; 1541 1542 /* Phase II: commit. This step cannot fail. */ 1543 ctx->prepare = false; 1544 ret = (*func)(ctx); 1545 /* This should never happen: commit is not allowed to fail */ 1546 if (unlikely(ret)) 1547 WARN(1, "MACsec offloading commit failed (%d)\n", ret); 1548 1549 phy_unlock: 1550 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1551 mutex_unlock(&ctx->phydev->lock); 1552 1553 return ret; 1554 } 1555 1556 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1557 { 1558 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1559 return -EINVAL; 1560 1561 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL)) 1562 return -EINVAL; 1563 1564 return 0; 1565 } 1566 1567 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1568 { 1569 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1570 return -EINVAL; 1571 1572 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL)) 1573 return -EINVAL; 1574 1575 return 0; 1576 } 1577 1578 static bool validate_add_rxsa(struct nlattr **attrs) 1579 { 1580 if (!attrs[MACSEC_SA_ATTR_AN] || 1581 !attrs[MACSEC_SA_ATTR_KEY] || 1582 !attrs[MACSEC_SA_ATTR_KEYID]) 1583 return false; 1584 1585 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1586 return false; 1587 1588 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1589 return false; 1590 1591 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1592 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1593 return false; 1594 } 1595 1596 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1597 return false; 1598 1599 return true; 1600 } 1601 1602 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1603 { 1604 struct net_device *dev; 1605 struct nlattr **attrs = info->attrs; 1606 struct macsec_secy *secy; 1607 struct macsec_rx_sc *rx_sc; 1608 struct macsec_rx_sa *rx_sa; 1609 unsigned char assoc_num; 1610 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1611 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1612 int err; 1613 1614 if (!attrs[MACSEC_ATTR_IFINDEX]) 1615 return -EINVAL; 1616 1617 if (parse_sa_config(attrs, tb_sa)) 1618 return -EINVAL; 1619 1620 if (parse_rxsc_config(attrs, tb_rxsc)) 1621 return -EINVAL; 1622 1623 if (!validate_add_rxsa(tb_sa)) 1624 return -EINVAL; 1625 1626 rtnl_lock(); 1627 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1628 if (IS_ERR(rx_sc)) { 1629 rtnl_unlock(); 1630 return PTR_ERR(rx_sc); 1631 } 1632 1633 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1634 1635 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1636 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1637 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1638 rtnl_unlock(); 1639 return -EINVAL; 1640 } 1641 1642 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1643 if (rx_sa) { 1644 rtnl_unlock(); 1645 return -EBUSY; 1646 } 1647 1648 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1649 if (!rx_sa) { 1650 rtnl_unlock(); 1651 return -ENOMEM; 1652 } 1653 1654 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1655 secy->key_len, secy->icv_len); 1656 if (err < 0) { 1657 kfree(rx_sa); 1658 rtnl_unlock(); 1659 return err; 1660 } 1661 1662 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1663 spin_lock_bh(&rx_sa->lock); 1664 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1665 spin_unlock_bh(&rx_sa->lock); 1666 } 1667 1668 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1669 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1670 1671 rx_sa->sc = rx_sc; 1672 1673 /* If h/w offloading is available, propagate to the device */ 1674 if (macsec_is_offloaded(netdev_priv(dev))) { 1675 const struct macsec_ops *ops; 1676 struct macsec_context ctx; 1677 1678 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1679 if (!ops) { 1680 err = -EOPNOTSUPP; 1681 goto cleanup; 1682 } 1683 1684 ctx.sa.assoc_num = assoc_num; 1685 ctx.sa.rx_sa = rx_sa; 1686 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1687 MACSEC_KEYID_LEN); 1688 1689 err = macsec_offload(ops->mdo_add_rxsa, &ctx); 1690 if (err) 1691 goto cleanup; 1692 } 1693 1694 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1695 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1696 1697 rtnl_unlock(); 1698 1699 return 0; 1700 1701 cleanup: 1702 kfree(rx_sa); 1703 rtnl_unlock(); 1704 return err; 1705 } 1706 1707 static bool validate_add_rxsc(struct nlattr **attrs) 1708 { 1709 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1710 return false; 1711 1712 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1713 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1714 return false; 1715 } 1716 1717 return true; 1718 } 1719 1720 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1721 { 1722 struct net_device *dev; 1723 sci_t sci = MACSEC_UNDEF_SCI; 1724 struct nlattr **attrs = info->attrs; 1725 struct macsec_rx_sc *rx_sc; 1726 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1727 bool was_active; 1728 int ret; 1729 1730 if (!attrs[MACSEC_ATTR_IFINDEX]) 1731 return -EINVAL; 1732 1733 if (parse_rxsc_config(attrs, tb_rxsc)) 1734 return -EINVAL; 1735 1736 if (!validate_add_rxsc(tb_rxsc)) 1737 return -EINVAL; 1738 1739 rtnl_lock(); 1740 dev = get_dev_from_nl(genl_info_net(info), attrs); 1741 if (IS_ERR(dev)) { 1742 rtnl_unlock(); 1743 return PTR_ERR(dev); 1744 } 1745 1746 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1747 1748 rx_sc = create_rx_sc(dev, sci); 1749 if (IS_ERR(rx_sc)) { 1750 rtnl_unlock(); 1751 return PTR_ERR(rx_sc); 1752 } 1753 1754 was_active = rx_sc->active; 1755 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1756 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1757 1758 if (macsec_is_offloaded(netdev_priv(dev))) { 1759 const struct macsec_ops *ops; 1760 struct macsec_context ctx; 1761 1762 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1763 if (!ops) { 1764 ret = -EOPNOTSUPP; 1765 goto cleanup; 1766 } 1767 1768 ctx.rx_sc = rx_sc; 1769 1770 ret = macsec_offload(ops->mdo_add_rxsc, &ctx); 1771 if (ret) 1772 goto cleanup; 1773 } 1774 1775 rtnl_unlock(); 1776 1777 return 0; 1778 1779 cleanup: 1780 rx_sc->active = was_active; 1781 rtnl_unlock(); 1782 return ret; 1783 } 1784 1785 static bool validate_add_txsa(struct nlattr **attrs) 1786 { 1787 if (!attrs[MACSEC_SA_ATTR_AN] || 1788 !attrs[MACSEC_SA_ATTR_PN] || 1789 !attrs[MACSEC_SA_ATTR_KEY] || 1790 !attrs[MACSEC_SA_ATTR_KEYID]) 1791 return false; 1792 1793 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1794 return false; 1795 1796 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 1797 return false; 1798 1799 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1800 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1801 return false; 1802 } 1803 1804 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1805 return false; 1806 1807 return true; 1808 } 1809 1810 static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1811 { 1812 struct net_device *dev; 1813 struct nlattr **attrs = info->attrs; 1814 struct macsec_secy *secy; 1815 struct macsec_tx_sc *tx_sc; 1816 struct macsec_tx_sa *tx_sa; 1817 unsigned char assoc_num; 1818 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1819 bool was_operational; 1820 int err; 1821 1822 if (!attrs[MACSEC_ATTR_IFINDEX]) 1823 return -EINVAL; 1824 1825 if (parse_sa_config(attrs, tb_sa)) 1826 return -EINVAL; 1827 1828 if (!validate_add_txsa(tb_sa)) 1829 return -EINVAL; 1830 1831 rtnl_lock(); 1832 dev = get_dev_from_nl(genl_info_net(info), attrs); 1833 if (IS_ERR(dev)) { 1834 rtnl_unlock(); 1835 return PTR_ERR(dev); 1836 } 1837 1838 secy = &macsec_priv(dev)->secy; 1839 tx_sc = &secy->tx_sc; 1840 1841 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1842 1843 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1844 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 1845 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1846 rtnl_unlock(); 1847 return -EINVAL; 1848 } 1849 1850 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 1851 if (tx_sa) { 1852 rtnl_unlock(); 1853 return -EBUSY; 1854 } 1855 1856 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 1857 if (!tx_sa) { 1858 rtnl_unlock(); 1859 return -ENOMEM; 1860 } 1861 1862 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1863 secy->key_len, secy->icv_len); 1864 if (err < 0) { 1865 kfree(tx_sa); 1866 rtnl_unlock(); 1867 return err; 1868 } 1869 1870 spin_lock_bh(&tx_sa->lock); 1871 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 1872 spin_unlock_bh(&tx_sa->lock); 1873 1874 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1875 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1876 1877 was_operational = secy->operational; 1878 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 1879 secy->operational = true; 1880 1881 /* If h/w offloading is available, propagate to the device */ 1882 if (macsec_is_offloaded(netdev_priv(dev))) { 1883 const struct macsec_ops *ops; 1884 struct macsec_context ctx; 1885 1886 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1887 if (!ops) { 1888 err = -EOPNOTSUPP; 1889 goto cleanup; 1890 } 1891 1892 ctx.sa.assoc_num = assoc_num; 1893 ctx.sa.tx_sa = tx_sa; 1894 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1895 MACSEC_KEYID_LEN); 1896 1897 err = macsec_offload(ops->mdo_add_txsa, &ctx); 1898 if (err) 1899 goto cleanup; 1900 } 1901 1902 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1903 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 1904 1905 rtnl_unlock(); 1906 1907 return 0; 1908 1909 cleanup: 1910 secy->operational = was_operational; 1911 kfree(tx_sa); 1912 rtnl_unlock(); 1913 return err; 1914 } 1915 1916 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 1917 { 1918 struct nlattr **attrs = info->attrs; 1919 struct net_device *dev; 1920 struct macsec_secy *secy; 1921 struct macsec_rx_sc *rx_sc; 1922 struct macsec_rx_sa *rx_sa; 1923 u8 assoc_num; 1924 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1925 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1926 int ret; 1927 1928 if (!attrs[MACSEC_ATTR_IFINDEX]) 1929 return -EINVAL; 1930 1931 if (parse_sa_config(attrs, tb_sa)) 1932 return -EINVAL; 1933 1934 if (parse_rxsc_config(attrs, tb_rxsc)) 1935 return -EINVAL; 1936 1937 rtnl_lock(); 1938 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 1939 &dev, &secy, &rx_sc, &assoc_num); 1940 if (IS_ERR(rx_sa)) { 1941 rtnl_unlock(); 1942 return PTR_ERR(rx_sa); 1943 } 1944 1945 if (rx_sa->active) { 1946 rtnl_unlock(); 1947 return -EBUSY; 1948 } 1949 1950 /* If h/w offloading is available, propagate to the device */ 1951 if (macsec_is_offloaded(netdev_priv(dev))) { 1952 const struct macsec_ops *ops; 1953 struct macsec_context ctx; 1954 1955 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1956 if (!ops) { 1957 ret = -EOPNOTSUPP; 1958 goto cleanup; 1959 } 1960 1961 ctx.sa.assoc_num = assoc_num; 1962 ctx.sa.rx_sa = rx_sa; 1963 1964 ret = macsec_offload(ops->mdo_del_rxsa, &ctx); 1965 if (ret) 1966 goto cleanup; 1967 } 1968 1969 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 1970 clear_rx_sa(rx_sa); 1971 1972 rtnl_unlock(); 1973 1974 return 0; 1975 1976 cleanup: 1977 rtnl_unlock(); 1978 return ret; 1979 } 1980 1981 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 1982 { 1983 struct nlattr **attrs = info->attrs; 1984 struct net_device *dev; 1985 struct macsec_secy *secy; 1986 struct macsec_rx_sc *rx_sc; 1987 sci_t sci; 1988 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1989 int ret; 1990 1991 if (!attrs[MACSEC_ATTR_IFINDEX]) 1992 return -EINVAL; 1993 1994 if (parse_rxsc_config(attrs, tb_rxsc)) 1995 return -EINVAL; 1996 1997 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1998 return -EINVAL; 1999 2000 rtnl_lock(); 2001 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 2002 if (IS_ERR(dev)) { 2003 rtnl_unlock(); 2004 return PTR_ERR(dev); 2005 } 2006 2007 secy = &macsec_priv(dev)->secy; 2008 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 2009 2010 rx_sc = del_rx_sc(secy, sci); 2011 if (!rx_sc) { 2012 rtnl_unlock(); 2013 return -ENODEV; 2014 } 2015 2016 /* If h/w offloading is available, propagate to the device */ 2017 if (macsec_is_offloaded(netdev_priv(dev))) { 2018 const struct macsec_ops *ops; 2019 struct macsec_context ctx; 2020 2021 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2022 if (!ops) { 2023 ret = -EOPNOTSUPP; 2024 goto cleanup; 2025 } 2026 2027 ctx.rx_sc = rx_sc; 2028 ret = macsec_offload(ops->mdo_del_rxsc, &ctx); 2029 if (ret) 2030 goto cleanup; 2031 } 2032 2033 free_rx_sc(rx_sc); 2034 rtnl_unlock(); 2035 2036 return 0; 2037 2038 cleanup: 2039 rtnl_unlock(); 2040 return ret; 2041 } 2042 2043 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 2044 { 2045 struct nlattr **attrs = info->attrs; 2046 struct net_device *dev; 2047 struct macsec_secy *secy; 2048 struct macsec_tx_sc *tx_sc; 2049 struct macsec_tx_sa *tx_sa; 2050 u8 assoc_num; 2051 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2052 int ret; 2053 2054 if (!attrs[MACSEC_ATTR_IFINDEX]) 2055 return -EINVAL; 2056 2057 if (parse_sa_config(attrs, tb_sa)) 2058 return -EINVAL; 2059 2060 rtnl_lock(); 2061 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2062 &dev, &secy, &tx_sc, &assoc_num); 2063 if (IS_ERR(tx_sa)) { 2064 rtnl_unlock(); 2065 return PTR_ERR(tx_sa); 2066 } 2067 2068 if (tx_sa->active) { 2069 rtnl_unlock(); 2070 return -EBUSY; 2071 } 2072 2073 /* If h/w offloading is available, propagate to the device */ 2074 if (macsec_is_offloaded(netdev_priv(dev))) { 2075 const struct macsec_ops *ops; 2076 struct macsec_context ctx; 2077 2078 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2079 if (!ops) { 2080 ret = -EOPNOTSUPP; 2081 goto cleanup; 2082 } 2083 2084 ctx.sa.assoc_num = assoc_num; 2085 ctx.sa.tx_sa = tx_sa; 2086 2087 ret = macsec_offload(ops->mdo_del_txsa, &ctx); 2088 if (ret) 2089 goto cleanup; 2090 } 2091 2092 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 2093 clear_tx_sa(tx_sa); 2094 2095 rtnl_unlock(); 2096 2097 return 0; 2098 2099 cleanup: 2100 rtnl_unlock(); 2101 return ret; 2102 } 2103 2104 static bool validate_upd_sa(struct nlattr **attrs) 2105 { 2106 if (!attrs[MACSEC_SA_ATTR_AN] || 2107 attrs[MACSEC_SA_ATTR_KEY] || 2108 attrs[MACSEC_SA_ATTR_KEYID]) 2109 return false; 2110 2111 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 2112 return false; 2113 2114 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) 2115 return false; 2116 2117 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 2118 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 2119 return false; 2120 } 2121 2122 return true; 2123 } 2124 2125 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2126 { 2127 struct nlattr **attrs = info->attrs; 2128 struct net_device *dev; 2129 struct macsec_secy *secy; 2130 struct macsec_tx_sc *tx_sc; 2131 struct macsec_tx_sa *tx_sa; 2132 u8 assoc_num; 2133 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2134 bool was_operational, was_active; 2135 u32 prev_pn = 0; 2136 int ret = 0; 2137 2138 if (!attrs[MACSEC_ATTR_IFINDEX]) 2139 return -EINVAL; 2140 2141 if (parse_sa_config(attrs, tb_sa)) 2142 return -EINVAL; 2143 2144 if (!validate_upd_sa(tb_sa)) 2145 return -EINVAL; 2146 2147 rtnl_lock(); 2148 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2149 &dev, &secy, &tx_sc, &assoc_num); 2150 if (IS_ERR(tx_sa)) { 2151 rtnl_unlock(); 2152 return PTR_ERR(tx_sa); 2153 } 2154 2155 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2156 spin_lock_bh(&tx_sa->lock); 2157 prev_pn = tx_sa->next_pn; 2158 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 2159 spin_unlock_bh(&tx_sa->lock); 2160 } 2161 2162 was_active = tx_sa->active; 2163 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2164 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2165 2166 was_operational = secy->operational; 2167 if (assoc_num == tx_sc->encoding_sa) 2168 secy->operational = tx_sa->active; 2169 2170 /* If h/w offloading is available, propagate to the device */ 2171 if (macsec_is_offloaded(netdev_priv(dev))) { 2172 const struct macsec_ops *ops; 2173 struct macsec_context ctx; 2174 2175 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2176 if (!ops) { 2177 ret = -EOPNOTSUPP; 2178 goto cleanup; 2179 } 2180 2181 ctx.sa.assoc_num = assoc_num; 2182 ctx.sa.tx_sa = tx_sa; 2183 2184 ret = macsec_offload(ops->mdo_upd_txsa, &ctx); 2185 if (ret) 2186 goto cleanup; 2187 } 2188 2189 rtnl_unlock(); 2190 2191 return 0; 2192 2193 cleanup: 2194 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2195 spin_lock_bh(&tx_sa->lock); 2196 tx_sa->next_pn = prev_pn; 2197 spin_unlock_bh(&tx_sa->lock); 2198 } 2199 tx_sa->active = was_active; 2200 secy->operational = was_operational; 2201 rtnl_unlock(); 2202 return ret; 2203 } 2204 2205 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2206 { 2207 struct nlattr **attrs = info->attrs; 2208 struct net_device *dev; 2209 struct macsec_secy *secy; 2210 struct macsec_rx_sc *rx_sc; 2211 struct macsec_rx_sa *rx_sa; 2212 u8 assoc_num; 2213 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2214 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2215 bool was_active; 2216 u32 prev_pn = 0; 2217 int ret = 0; 2218 2219 if (!attrs[MACSEC_ATTR_IFINDEX]) 2220 return -EINVAL; 2221 2222 if (parse_rxsc_config(attrs, tb_rxsc)) 2223 return -EINVAL; 2224 2225 if (parse_sa_config(attrs, tb_sa)) 2226 return -EINVAL; 2227 2228 if (!validate_upd_sa(tb_sa)) 2229 return -EINVAL; 2230 2231 rtnl_lock(); 2232 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2233 &dev, &secy, &rx_sc, &assoc_num); 2234 if (IS_ERR(rx_sa)) { 2235 rtnl_unlock(); 2236 return PTR_ERR(rx_sa); 2237 } 2238 2239 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2240 spin_lock_bh(&rx_sa->lock); 2241 prev_pn = rx_sa->next_pn; 2242 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); 2243 spin_unlock_bh(&rx_sa->lock); 2244 } 2245 2246 was_active = rx_sa->active; 2247 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2248 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2249 2250 /* If h/w offloading is available, propagate to the device */ 2251 if (macsec_is_offloaded(netdev_priv(dev))) { 2252 const struct macsec_ops *ops; 2253 struct macsec_context ctx; 2254 2255 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2256 if (!ops) { 2257 ret = -EOPNOTSUPP; 2258 goto cleanup; 2259 } 2260 2261 ctx.sa.assoc_num = assoc_num; 2262 ctx.sa.rx_sa = rx_sa; 2263 2264 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx); 2265 if (ret) 2266 goto cleanup; 2267 } 2268 2269 rtnl_unlock(); 2270 return 0; 2271 2272 cleanup: 2273 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2274 spin_lock_bh(&rx_sa->lock); 2275 rx_sa->next_pn = prev_pn; 2276 spin_unlock_bh(&rx_sa->lock); 2277 } 2278 rx_sa->active = was_active; 2279 rtnl_unlock(); 2280 return ret; 2281 } 2282 2283 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2284 { 2285 struct nlattr **attrs = info->attrs; 2286 struct net_device *dev; 2287 struct macsec_secy *secy; 2288 struct macsec_rx_sc *rx_sc; 2289 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2290 unsigned int prev_n_rx_sc; 2291 bool was_active; 2292 int ret; 2293 2294 if (!attrs[MACSEC_ATTR_IFINDEX]) 2295 return -EINVAL; 2296 2297 if (parse_rxsc_config(attrs, tb_rxsc)) 2298 return -EINVAL; 2299 2300 if (!validate_add_rxsc(tb_rxsc)) 2301 return -EINVAL; 2302 2303 rtnl_lock(); 2304 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2305 if (IS_ERR(rx_sc)) { 2306 rtnl_unlock(); 2307 return PTR_ERR(rx_sc); 2308 } 2309 2310 was_active = rx_sc->active; 2311 prev_n_rx_sc = secy->n_rx_sc; 2312 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2313 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2314 2315 if (rx_sc->active != new) 2316 secy->n_rx_sc += new ? 1 : -1; 2317 2318 rx_sc->active = new; 2319 } 2320 2321 /* If h/w offloading is available, propagate to the device */ 2322 if (macsec_is_offloaded(netdev_priv(dev))) { 2323 const struct macsec_ops *ops; 2324 struct macsec_context ctx; 2325 2326 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2327 if (!ops) { 2328 ret = -EOPNOTSUPP; 2329 goto cleanup; 2330 } 2331 2332 ctx.rx_sc = rx_sc; 2333 2334 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx); 2335 if (ret) 2336 goto cleanup; 2337 } 2338 2339 rtnl_unlock(); 2340 2341 return 0; 2342 2343 cleanup: 2344 secy->n_rx_sc = prev_n_rx_sc; 2345 rx_sc->active = was_active; 2346 rtnl_unlock(); 2347 return ret; 2348 } 2349 2350 static bool macsec_is_configured(struct macsec_dev *macsec) 2351 { 2352 struct macsec_secy *secy = &macsec->secy; 2353 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2354 int i; 2355 2356 if (secy->n_rx_sc > 0) 2357 return true; 2358 2359 for (i = 0; i < MACSEC_NUM_AN; i++) 2360 if (tx_sc->sa[i]) 2361 return true; 2362 2363 return false; 2364 } 2365 2366 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info) 2367 { 2368 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1]; 2369 enum macsec_offload offload, prev_offload; 2370 int (*func)(struct macsec_context *ctx); 2371 struct nlattr **attrs = info->attrs; 2372 struct net_device *dev, *loop_dev; 2373 const struct macsec_ops *ops; 2374 struct macsec_context ctx; 2375 struct macsec_dev *macsec; 2376 struct net *loop_net; 2377 int ret; 2378 2379 if (!attrs[MACSEC_ATTR_IFINDEX]) 2380 return -EINVAL; 2381 2382 if (!attrs[MACSEC_ATTR_OFFLOAD]) 2383 return -EINVAL; 2384 2385 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX, 2386 attrs[MACSEC_ATTR_OFFLOAD], 2387 macsec_genl_offload_policy, NULL)) 2388 return -EINVAL; 2389 2390 dev = get_dev_from_nl(genl_info_net(info), attrs); 2391 if (IS_ERR(dev)) 2392 return PTR_ERR(dev); 2393 macsec = macsec_priv(dev); 2394 2395 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]); 2396 if (macsec->offload == offload) 2397 return 0; 2398 2399 /* Check if the offloading mode is supported by the underlying layers */ 2400 if (offload != MACSEC_OFFLOAD_OFF && 2401 !macsec_check_offload(offload, macsec)) 2402 return -EOPNOTSUPP; 2403 2404 if (offload == MACSEC_OFFLOAD_OFF) 2405 goto skip_limitation; 2406 2407 /* Check the physical interface isn't offloading another interface 2408 * first. 2409 */ 2410 for_each_net(loop_net) { 2411 for_each_netdev(loop_net, loop_dev) { 2412 struct macsec_dev *priv; 2413 2414 if (!netif_is_macsec(loop_dev)) 2415 continue; 2416 2417 priv = macsec_priv(loop_dev); 2418 2419 if (priv->real_dev == macsec->real_dev && 2420 priv->offload != MACSEC_OFFLOAD_OFF) 2421 return -EBUSY; 2422 } 2423 } 2424 2425 skip_limitation: 2426 /* Check if the net device is busy. */ 2427 if (netif_running(dev)) 2428 return -EBUSY; 2429 2430 rtnl_lock(); 2431 2432 prev_offload = macsec->offload; 2433 macsec->offload = offload; 2434 2435 /* Check if the device already has rules configured: we do not support 2436 * rules migration. 2437 */ 2438 if (macsec_is_configured(macsec)) { 2439 ret = -EBUSY; 2440 goto rollback; 2441 } 2442 2443 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload, 2444 macsec, &ctx); 2445 if (!ops) { 2446 ret = -EOPNOTSUPP; 2447 goto rollback; 2448 } 2449 2450 if (prev_offload == MACSEC_OFFLOAD_OFF) 2451 func = ops->mdo_add_secy; 2452 else 2453 func = ops->mdo_del_secy; 2454 2455 ctx.secy = &macsec->secy; 2456 ret = macsec_offload(func, &ctx); 2457 if (ret) 2458 goto rollback; 2459 2460 rtnl_unlock(); 2461 return 0; 2462 2463 rollback: 2464 macsec->offload = prev_offload; 2465 2466 rtnl_unlock(); 2467 return ret; 2468 } 2469 2470 static int copy_tx_sa_stats(struct sk_buff *skb, 2471 struct macsec_tx_sa_stats __percpu *pstats) 2472 { 2473 struct macsec_tx_sa_stats sum = {0, }; 2474 int cpu; 2475 2476 for_each_possible_cpu(cpu) { 2477 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2478 2479 sum.OutPktsProtected += stats->OutPktsProtected; 2480 sum.OutPktsEncrypted += stats->OutPktsEncrypted; 2481 } 2482 2483 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) || 2484 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted)) 2485 return -EMSGSIZE; 2486 2487 return 0; 2488 } 2489 2490 static noinline_for_stack int 2491 copy_rx_sa_stats(struct sk_buff *skb, 2492 struct macsec_rx_sa_stats __percpu *pstats) 2493 { 2494 struct macsec_rx_sa_stats sum = {0, }; 2495 int cpu; 2496 2497 for_each_possible_cpu(cpu) { 2498 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu); 2499 2500 sum.InPktsOK += stats->InPktsOK; 2501 sum.InPktsInvalid += stats->InPktsInvalid; 2502 sum.InPktsNotValid += stats->InPktsNotValid; 2503 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA; 2504 sum.InPktsUnusedSA += stats->InPktsUnusedSA; 2505 } 2506 2507 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) || 2508 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) || 2509 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) || 2510 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) || 2511 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA)) 2512 return -EMSGSIZE; 2513 2514 return 0; 2515 } 2516 2517 static noinline_for_stack int 2518 copy_rx_sc_stats(struct sk_buff *skb, struct pcpu_rx_sc_stats __percpu *pstats) 2519 { 2520 struct macsec_rx_sc_stats sum = {0, }; 2521 int cpu; 2522 2523 for_each_possible_cpu(cpu) { 2524 const struct pcpu_rx_sc_stats *stats; 2525 struct macsec_rx_sc_stats tmp; 2526 unsigned int start; 2527 2528 stats = per_cpu_ptr(pstats, cpu); 2529 do { 2530 start = u64_stats_fetch_begin_irq(&stats->syncp); 2531 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2532 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2533 2534 sum.InOctetsValidated += tmp.InOctetsValidated; 2535 sum.InOctetsDecrypted += tmp.InOctetsDecrypted; 2536 sum.InPktsUnchecked += tmp.InPktsUnchecked; 2537 sum.InPktsDelayed += tmp.InPktsDelayed; 2538 sum.InPktsOK += tmp.InPktsOK; 2539 sum.InPktsInvalid += tmp.InPktsInvalid; 2540 sum.InPktsLate += tmp.InPktsLate; 2541 sum.InPktsNotValid += tmp.InPktsNotValid; 2542 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2543 sum.InPktsUnusedSA += tmp.InPktsUnusedSA; 2544 } 2545 2546 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2547 sum.InOctetsValidated, 2548 MACSEC_RXSC_STATS_ATTR_PAD) || 2549 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2550 sum.InOctetsDecrypted, 2551 MACSEC_RXSC_STATS_ATTR_PAD) || 2552 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2553 sum.InPktsUnchecked, 2554 MACSEC_RXSC_STATS_ATTR_PAD) || 2555 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2556 sum.InPktsDelayed, 2557 MACSEC_RXSC_STATS_ATTR_PAD) || 2558 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2559 sum.InPktsOK, 2560 MACSEC_RXSC_STATS_ATTR_PAD) || 2561 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2562 sum.InPktsInvalid, 2563 MACSEC_RXSC_STATS_ATTR_PAD) || 2564 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2565 sum.InPktsLate, 2566 MACSEC_RXSC_STATS_ATTR_PAD) || 2567 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2568 sum.InPktsNotValid, 2569 MACSEC_RXSC_STATS_ATTR_PAD) || 2570 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2571 sum.InPktsNotUsingSA, 2572 MACSEC_RXSC_STATS_ATTR_PAD) || 2573 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2574 sum.InPktsUnusedSA, 2575 MACSEC_RXSC_STATS_ATTR_PAD)) 2576 return -EMSGSIZE; 2577 2578 return 0; 2579 } 2580 2581 static noinline_for_stack int 2582 copy_tx_sc_stats(struct sk_buff *skb, struct pcpu_tx_sc_stats __percpu *pstats) 2583 { 2584 struct macsec_tx_sc_stats sum = {0, }; 2585 int cpu; 2586 2587 for_each_possible_cpu(cpu) { 2588 const struct pcpu_tx_sc_stats *stats; 2589 struct macsec_tx_sc_stats tmp; 2590 unsigned int start; 2591 2592 stats = per_cpu_ptr(pstats, cpu); 2593 do { 2594 start = u64_stats_fetch_begin_irq(&stats->syncp); 2595 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2596 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2597 2598 sum.OutPktsProtected += tmp.OutPktsProtected; 2599 sum.OutPktsEncrypted += tmp.OutPktsEncrypted; 2600 sum.OutOctetsProtected += tmp.OutOctetsProtected; 2601 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2602 } 2603 2604 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2605 sum.OutPktsProtected, 2606 MACSEC_TXSC_STATS_ATTR_PAD) || 2607 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2608 sum.OutPktsEncrypted, 2609 MACSEC_TXSC_STATS_ATTR_PAD) || 2610 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2611 sum.OutOctetsProtected, 2612 MACSEC_TXSC_STATS_ATTR_PAD) || 2613 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2614 sum.OutOctetsEncrypted, 2615 MACSEC_TXSC_STATS_ATTR_PAD)) 2616 return -EMSGSIZE; 2617 2618 return 0; 2619 } 2620 2621 static noinline_for_stack int 2622 copy_secy_stats(struct sk_buff *skb, struct pcpu_secy_stats __percpu *pstats) 2623 { 2624 struct macsec_dev_stats sum = {0, }; 2625 int cpu; 2626 2627 for_each_possible_cpu(cpu) { 2628 const struct pcpu_secy_stats *stats; 2629 struct macsec_dev_stats tmp; 2630 unsigned int start; 2631 2632 stats = per_cpu_ptr(pstats, cpu); 2633 do { 2634 start = u64_stats_fetch_begin_irq(&stats->syncp); 2635 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2636 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 2637 2638 sum.OutPktsUntagged += tmp.OutPktsUntagged; 2639 sum.InPktsUntagged += tmp.InPktsUntagged; 2640 sum.OutPktsTooLong += tmp.OutPktsTooLong; 2641 sum.InPktsNoTag += tmp.InPktsNoTag; 2642 sum.InPktsBadTag += tmp.InPktsBadTag; 2643 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2644 sum.InPktsNoSCI += tmp.InPktsNoSCI; 2645 sum.InPktsOverrun += tmp.InPktsOverrun; 2646 } 2647 2648 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 2649 sum.OutPktsUntagged, 2650 MACSEC_SECY_STATS_ATTR_PAD) || 2651 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 2652 sum.InPktsUntagged, 2653 MACSEC_SECY_STATS_ATTR_PAD) || 2654 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 2655 sum.OutPktsTooLong, 2656 MACSEC_SECY_STATS_ATTR_PAD) || 2657 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 2658 sum.InPktsNoTag, 2659 MACSEC_SECY_STATS_ATTR_PAD) || 2660 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 2661 sum.InPktsBadTag, 2662 MACSEC_SECY_STATS_ATTR_PAD) || 2663 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 2664 sum.InPktsUnknownSCI, 2665 MACSEC_SECY_STATS_ATTR_PAD) || 2666 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 2667 sum.InPktsNoSCI, 2668 MACSEC_SECY_STATS_ATTR_PAD) || 2669 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 2670 sum.InPktsOverrun, 2671 MACSEC_SECY_STATS_ATTR_PAD)) 2672 return -EMSGSIZE; 2673 2674 return 0; 2675 } 2676 2677 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 2678 { 2679 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2680 struct nlattr *secy_nest = nla_nest_start_noflag(skb, 2681 MACSEC_ATTR_SECY); 2682 u64 csid; 2683 2684 if (!secy_nest) 2685 return 1; 2686 2687 switch (secy->key_len) { 2688 case MACSEC_GCM_AES_128_SAK_LEN: 2689 csid = MACSEC_DEFAULT_CIPHER_ID; 2690 break; 2691 case MACSEC_GCM_AES_256_SAK_LEN: 2692 csid = MACSEC_CIPHER_ID_GCM_AES_256; 2693 break; 2694 default: 2695 goto cancel; 2696 } 2697 2698 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 2699 MACSEC_SECY_ATTR_PAD) || 2700 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 2701 csid, MACSEC_SECY_ATTR_PAD) || 2702 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 2703 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 2704 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 2705 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 2706 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 2707 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 2708 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 2709 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 2710 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 2711 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 2712 goto cancel; 2713 2714 if (secy->replay_protect) { 2715 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 2716 goto cancel; 2717 } 2718 2719 nla_nest_end(skb, secy_nest); 2720 return 0; 2721 2722 cancel: 2723 nla_nest_cancel(skb, secy_nest); 2724 return 1; 2725 } 2726 2727 static noinline_for_stack int 2728 dump_secy(struct macsec_secy *secy, struct net_device *dev, 2729 struct sk_buff *skb, struct netlink_callback *cb) 2730 { 2731 struct macsec_dev *macsec = netdev_priv(dev); 2732 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2733 struct nlattr *txsa_list, *rxsc_list; 2734 struct macsec_rx_sc *rx_sc; 2735 struct nlattr *attr; 2736 void *hdr; 2737 int i, j; 2738 2739 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 2740 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 2741 if (!hdr) 2742 return -EMSGSIZE; 2743 2744 genl_dump_check_consistent(cb, hdr); 2745 2746 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 2747 goto nla_put_failure; 2748 2749 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD); 2750 if (!attr) 2751 goto nla_put_failure; 2752 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload)) 2753 goto nla_put_failure; 2754 nla_nest_end(skb, attr); 2755 2756 if (nla_put_secy(secy, skb)) 2757 goto nla_put_failure; 2758 2759 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS); 2760 if (!attr) 2761 goto nla_put_failure; 2762 if (copy_tx_sc_stats(skb, tx_sc->stats)) { 2763 nla_nest_cancel(skb, attr); 2764 goto nla_put_failure; 2765 } 2766 nla_nest_end(skb, attr); 2767 2768 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS); 2769 if (!attr) 2770 goto nla_put_failure; 2771 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) { 2772 nla_nest_cancel(skb, attr); 2773 goto nla_put_failure; 2774 } 2775 nla_nest_end(skb, attr); 2776 2777 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST); 2778 if (!txsa_list) 2779 goto nla_put_failure; 2780 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 2781 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 2782 struct nlattr *txsa_nest; 2783 2784 if (!tx_sa) 2785 continue; 2786 2787 txsa_nest = nla_nest_start_noflag(skb, j++); 2788 if (!txsa_nest) { 2789 nla_nest_cancel(skb, txsa_list); 2790 goto nla_put_failure; 2791 } 2792 2793 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2794 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) || 2795 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 2796 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 2797 nla_nest_cancel(skb, txsa_nest); 2798 nla_nest_cancel(skb, txsa_list); 2799 goto nla_put_failure; 2800 } 2801 2802 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS); 2803 if (!attr) { 2804 nla_nest_cancel(skb, txsa_nest); 2805 nla_nest_cancel(skb, txsa_list); 2806 goto nla_put_failure; 2807 } 2808 if (copy_tx_sa_stats(skb, tx_sa->stats)) { 2809 nla_nest_cancel(skb, attr); 2810 nla_nest_cancel(skb, txsa_nest); 2811 nla_nest_cancel(skb, txsa_list); 2812 goto nla_put_failure; 2813 } 2814 nla_nest_end(skb, attr); 2815 2816 nla_nest_end(skb, txsa_nest); 2817 } 2818 nla_nest_end(skb, txsa_list); 2819 2820 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST); 2821 if (!rxsc_list) 2822 goto nla_put_failure; 2823 2824 j = 1; 2825 for_each_rxsc_rtnl(secy, rx_sc) { 2826 int k; 2827 struct nlattr *rxsa_list; 2828 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++); 2829 2830 if (!rxsc_nest) { 2831 nla_nest_cancel(skb, rxsc_list); 2832 goto nla_put_failure; 2833 } 2834 2835 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 2836 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 2837 MACSEC_RXSC_ATTR_PAD)) { 2838 nla_nest_cancel(skb, rxsc_nest); 2839 nla_nest_cancel(skb, rxsc_list); 2840 goto nla_put_failure; 2841 } 2842 2843 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS); 2844 if (!attr) { 2845 nla_nest_cancel(skb, rxsc_nest); 2846 nla_nest_cancel(skb, rxsc_list); 2847 goto nla_put_failure; 2848 } 2849 if (copy_rx_sc_stats(skb, rx_sc->stats)) { 2850 nla_nest_cancel(skb, attr); 2851 nla_nest_cancel(skb, rxsc_nest); 2852 nla_nest_cancel(skb, rxsc_list); 2853 goto nla_put_failure; 2854 } 2855 nla_nest_end(skb, attr); 2856 2857 rxsa_list = nla_nest_start_noflag(skb, 2858 MACSEC_RXSC_ATTR_SA_LIST); 2859 if (!rxsa_list) { 2860 nla_nest_cancel(skb, rxsc_nest); 2861 nla_nest_cancel(skb, rxsc_list); 2862 goto nla_put_failure; 2863 } 2864 2865 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 2866 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 2867 struct nlattr *rxsa_nest; 2868 2869 if (!rx_sa) 2870 continue; 2871 2872 rxsa_nest = nla_nest_start_noflag(skb, k++); 2873 if (!rxsa_nest) { 2874 nla_nest_cancel(skb, rxsa_list); 2875 nla_nest_cancel(skb, rxsc_nest); 2876 nla_nest_cancel(skb, rxsc_list); 2877 goto nla_put_failure; 2878 } 2879 2880 attr = nla_nest_start_noflag(skb, 2881 MACSEC_SA_ATTR_STATS); 2882 if (!attr) { 2883 nla_nest_cancel(skb, rxsa_list); 2884 nla_nest_cancel(skb, rxsc_nest); 2885 nla_nest_cancel(skb, rxsc_list); 2886 goto nla_put_failure; 2887 } 2888 if (copy_rx_sa_stats(skb, rx_sa->stats)) { 2889 nla_nest_cancel(skb, attr); 2890 nla_nest_cancel(skb, rxsa_list); 2891 nla_nest_cancel(skb, rxsc_nest); 2892 nla_nest_cancel(skb, rxsc_list); 2893 goto nla_put_failure; 2894 } 2895 nla_nest_end(skb, attr); 2896 2897 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 2898 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) || 2899 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 2900 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 2901 nla_nest_cancel(skb, rxsa_nest); 2902 nla_nest_cancel(skb, rxsc_nest); 2903 nla_nest_cancel(skb, rxsc_list); 2904 goto nla_put_failure; 2905 } 2906 nla_nest_end(skb, rxsa_nest); 2907 } 2908 2909 nla_nest_end(skb, rxsa_list); 2910 nla_nest_end(skb, rxsc_nest); 2911 } 2912 2913 nla_nest_end(skb, rxsc_list); 2914 2915 genlmsg_end(skb, hdr); 2916 2917 return 0; 2918 2919 nla_put_failure: 2920 genlmsg_cancel(skb, hdr); 2921 return -EMSGSIZE; 2922 } 2923 2924 static int macsec_generation = 1; /* protected by RTNL */ 2925 2926 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 2927 { 2928 struct net *net = sock_net(skb->sk); 2929 struct net_device *dev; 2930 int dev_idx, d; 2931 2932 dev_idx = cb->args[0]; 2933 2934 d = 0; 2935 rtnl_lock(); 2936 2937 cb->seq = macsec_generation; 2938 2939 for_each_netdev(net, dev) { 2940 struct macsec_secy *secy; 2941 2942 if (d < dev_idx) 2943 goto next; 2944 2945 if (!netif_is_macsec(dev)) 2946 goto next; 2947 2948 secy = &macsec_priv(dev)->secy; 2949 if (dump_secy(secy, dev, skb, cb) < 0) 2950 goto done; 2951 next: 2952 d++; 2953 } 2954 2955 done: 2956 rtnl_unlock(); 2957 cb->args[0] = d; 2958 return skb->len; 2959 } 2960 2961 static const struct genl_ops macsec_genl_ops[] = { 2962 { 2963 .cmd = MACSEC_CMD_GET_TXSC, 2964 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2965 .dumpit = macsec_dump_txsc, 2966 }, 2967 { 2968 .cmd = MACSEC_CMD_ADD_RXSC, 2969 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2970 .doit = macsec_add_rxsc, 2971 .flags = GENL_ADMIN_PERM, 2972 }, 2973 { 2974 .cmd = MACSEC_CMD_DEL_RXSC, 2975 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2976 .doit = macsec_del_rxsc, 2977 .flags = GENL_ADMIN_PERM, 2978 }, 2979 { 2980 .cmd = MACSEC_CMD_UPD_RXSC, 2981 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2982 .doit = macsec_upd_rxsc, 2983 .flags = GENL_ADMIN_PERM, 2984 }, 2985 { 2986 .cmd = MACSEC_CMD_ADD_TXSA, 2987 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2988 .doit = macsec_add_txsa, 2989 .flags = GENL_ADMIN_PERM, 2990 }, 2991 { 2992 .cmd = MACSEC_CMD_DEL_TXSA, 2993 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 2994 .doit = macsec_del_txsa, 2995 .flags = GENL_ADMIN_PERM, 2996 }, 2997 { 2998 .cmd = MACSEC_CMD_UPD_TXSA, 2999 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3000 .doit = macsec_upd_txsa, 3001 .flags = GENL_ADMIN_PERM, 3002 }, 3003 { 3004 .cmd = MACSEC_CMD_ADD_RXSA, 3005 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3006 .doit = macsec_add_rxsa, 3007 .flags = GENL_ADMIN_PERM, 3008 }, 3009 { 3010 .cmd = MACSEC_CMD_DEL_RXSA, 3011 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3012 .doit = macsec_del_rxsa, 3013 .flags = GENL_ADMIN_PERM, 3014 }, 3015 { 3016 .cmd = MACSEC_CMD_UPD_RXSA, 3017 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3018 .doit = macsec_upd_rxsa, 3019 .flags = GENL_ADMIN_PERM, 3020 }, 3021 { 3022 .cmd = MACSEC_CMD_UPD_OFFLOAD, 3023 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3024 .doit = macsec_upd_offload, 3025 .flags = GENL_ADMIN_PERM, 3026 }, 3027 }; 3028 3029 static struct genl_family macsec_fam __ro_after_init = { 3030 .name = MACSEC_GENL_NAME, 3031 .hdrsize = 0, 3032 .version = MACSEC_GENL_VERSION, 3033 .maxattr = MACSEC_ATTR_MAX, 3034 .policy = macsec_genl_policy, 3035 .netnsok = true, 3036 .module = THIS_MODULE, 3037 .ops = macsec_genl_ops, 3038 .n_ops = ARRAY_SIZE(macsec_genl_ops), 3039 }; 3040 3041 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 3042 struct net_device *dev) 3043 { 3044 struct macsec_dev *macsec = netdev_priv(dev); 3045 struct macsec_secy *secy = &macsec->secy; 3046 struct pcpu_secy_stats *secy_stats; 3047 int ret, len; 3048 3049 if (macsec_is_offloaded(netdev_priv(dev))) { 3050 skb->dev = macsec->real_dev; 3051 return dev_queue_xmit(skb); 3052 } 3053 3054 /* 10.5 */ 3055 if (!secy->protect_frames) { 3056 secy_stats = this_cpu_ptr(macsec->stats); 3057 u64_stats_update_begin(&secy_stats->syncp); 3058 secy_stats->stats.OutPktsUntagged++; 3059 u64_stats_update_end(&secy_stats->syncp); 3060 skb->dev = macsec->real_dev; 3061 len = skb->len; 3062 ret = dev_queue_xmit(skb); 3063 count_tx(dev, ret, len); 3064 return ret; 3065 } 3066 3067 if (!secy->operational) { 3068 kfree_skb(skb); 3069 dev->stats.tx_dropped++; 3070 return NETDEV_TX_OK; 3071 } 3072 3073 skb = macsec_encrypt(skb, dev); 3074 if (IS_ERR(skb)) { 3075 if (PTR_ERR(skb) != -EINPROGRESS) 3076 dev->stats.tx_dropped++; 3077 return NETDEV_TX_OK; 3078 } 3079 3080 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 3081 3082 macsec_encrypt_finish(skb, dev); 3083 len = skb->len; 3084 ret = dev_queue_xmit(skb); 3085 count_tx(dev, ret, len); 3086 return ret; 3087 } 3088 3089 #define MACSEC_FEATURES \ 3090 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 3091 3092 static int macsec_dev_init(struct net_device *dev) 3093 { 3094 struct macsec_dev *macsec = macsec_priv(dev); 3095 struct net_device *real_dev = macsec->real_dev; 3096 int err; 3097 3098 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 3099 if (!dev->tstats) 3100 return -ENOMEM; 3101 3102 err = gro_cells_init(&macsec->gro_cells, dev); 3103 if (err) { 3104 free_percpu(dev->tstats); 3105 return err; 3106 } 3107 3108 dev->features = real_dev->features & MACSEC_FEATURES; 3109 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 3110 3111 dev->needed_headroom = real_dev->needed_headroom + 3112 MACSEC_NEEDED_HEADROOM; 3113 dev->needed_tailroom = real_dev->needed_tailroom + 3114 MACSEC_NEEDED_TAILROOM; 3115 3116 if (is_zero_ether_addr(dev->dev_addr)) 3117 eth_hw_addr_inherit(dev, real_dev); 3118 if (is_zero_ether_addr(dev->broadcast)) 3119 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 3120 3121 return 0; 3122 } 3123 3124 static void macsec_dev_uninit(struct net_device *dev) 3125 { 3126 struct macsec_dev *macsec = macsec_priv(dev); 3127 3128 gro_cells_destroy(&macsec->gro_cells); 3129 free_percpu(dev->tstats); 3130 } 3131 3132 static netdev_features_t macsec_fix_features(struct net_device *dev, 3133 netdev_features_t features) 3134 { 3135 struct macsec_dev *macsec = macsec_priv(dev); 3136 struct net_device *real_dev = macsec->real_dev; 3137 3138 features &= (real_dev->features & MACSEC_FEATURES) | 3139 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 3140 features |= NETIF_F_LLTX; 3141 3142 return features; 3143 } 3144 3145 static int macsec_dev_open(struct net_device *dev) 3146 { 3147 struct macsec_dev *macsec = macsec_priv(dev); 3148 struct net_device *real_dev = macsec->real_dev; 3149 int err; 3150 3151 err = dev_uc_add(real_dev, dev->dev_addr); 3152 if (err < 0) 3153 return err; 3154 3155 if (dev->flags & IFF_ALLMULTI) { 3156 err = dev_set_allmulti(real_dev, 1); 3157 if (err < 0) 3158 goto del_unicast; 3159 } 3160 3161 if (dev->flags & IFF_PROMISC) { 3162 err = dev_set_promiscuity(real_dev, 1); 3163 if (err < 0) 3164 goto clear_allmulti; 3165 } 3166 3167 /* If h/w offloading is available, propagate to the device */ 3168 if (macsec_is_offloaded(macsec)) { 3169 const struct macsec_ops *ops; 3170 struct macsec_context ctx; 3171 3172 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3173 if (!ops) { 3174 err = -EOPNOTSUPP; 3175 goto clear_allmulti; 3176 } 3177 3178 err = macsec_offload(ops->mdo_dev_open, &ctx); 3179 if (err) 3180 goto clear_allmulti; 3181 } 3182 3183 if (netif_carrier_ok(real_dev)) 3184 netif_carrier_on(dev); 3185 3186 return 0; 3187 clear_allmulti: 3188 if (dev->flags & IFF_ALLMULTI) 3189 dev_set_allmulti(real_dev, -1); 3190 del_unicast: 3191 dev_uc_del(real_dev, dev->dev_addr); 3192 netif_carrier_off(dev); 3193 return err; 3194 } 3195 3196 static int macsec_dev_stop(struct net_device *dev) 3197 { 3198 struct macsec_dev *macsec = macsec_priv(dev); 3199 struct net_device *real_dev = macsec->real_dev; 3200 3201 netif_carrier_off(dev); 3202 3203 /* If h/w offloading is available, propagate to the device */ 3204 if (macsec_is_offloaded(macsec)) { 3205 const struct macsec_ops *ops; 3206 struct macsec_context ctx; 3207 3208 ops = macsec_get_ops(macsec, &ctx); 3209 if (ops) 3210 macsec_offload(ops->mdo_dev_stop, &ctx); 3211 } 3212 3213 dev_mc_unsync(real_dev, dev); 3214 dev_uc_unsync(real_dev, dev); 3215 3216 if (dev->flags & IFF_ALLMULTI) 3217 dev_set_allmulti(real_dev, -1); 3218 3219 if (dev->flags & IFF_PROMISC) 3220 dev_set_promiscuity(real_dev, -1); 3221 3222 dev_uc_del(real_dev, dev->dev_addr); 3223 3224 return 0; 3225 } 3226 3227 static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 3228 { 3229 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3230 3231 if (!(dev->flags & IFF_UP)) 3232 return; 3233 3234 if (change & IFF_ALLMULTI) 3235 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 3236 3237 if (change & IFF_PROMISC) 3238 dev_set_promiscuity(real_dev, 3239 dev->flags & IFF_PROMISC ? 1 : -1); 3240 } 3241 3242 static void macsec_dev_set_rx_mode(struct net_device *dev) 3243 { 3244 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3245 3246 dev_mc_sync(real_dev, dev); 3247 dev_uc_sync(real_dev, dev); 3248 } 3249 3250 static int macsec_set_mac_address(struct net_device *dev, void *p) 3251 { 3252 struct macsec_dev *macsec = macsec_priv(dev); 3253 struct net_device *real_dev = macsec->real_dev; 3254 struct sockaddr *addr = p; 3255 int err; 3256 3257 if (!is_valid_ether_addr(addr->sa_data)) 3258 return -EADDRNOTAVAIL; 3259 3260 if (!(dev->flags & IFF_UP)) 3261 goto out; 3262 3263 err = dev_uc_add(real_dev, addr->sa_data); 3264 if (err < 0) 3265 return err; 3266 3267 dev_uc_del(real_dev, dev->dev_addr); 3268 3269 out: 3270 ether_addr_copy(dev->dev_addr, addr->sa_data); 3271 return 0; 3272 } 3273 3274 static int macsec_change_mtu(struct net_device *dev, int new_mtu) 3275 { 3276 struct macsec_dev *macsec = macsec_priv(dev); 3277 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 3278 3279 if (macsec->real_dev->mtu - extra < new_mtu) 3280 return -ERANGE; 3281 3282 dev->mtu = new_mtu; 3283 3284 return 0; 3285 } 3286 3287 static void macsec_get_stats64(struct net_device *dev, 3288 struct rtnl_link_stats64 *s) 3289 { 3290 int cpu; 3291 3292 if (!dev->tstats) 3293 return; 3294 3295 for_each_possible_cpu(cpu) { 3296 struct pcpu_sw_netstats *stats; 3297 struct pcpu_sw_netstats tmp; 3298 int start; 3299 3300 stats = per_cpu_ptr(dev->tstats, cpu); 3301 do { 3302 start = u64_stats_fetch_begin_irq(&stats->syncp); 3303 tmp.rx_packets = stats->rx_packets; 3304 tmp.rx_bytes = stats->rx_bytes; 3305 tmp.tx_packets = stats->tx_packets; 3306 tmp.tx_bytes = stats->tx_bytes; 3307 } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); 3308 3309 s->rx_packets += tmp.rx_packets; 3310 s->rx_bytes += tmp.rx_bytes; 3311 s->tx_packets += tmp.tx_packets; 3312 s->tx_bytes += tmp.tx_bytes; 3313 } 3314 3315 s->rx_dropped = dev->stats.rx_dropped; 3316 s->tx_dropped = dev->stats.tx_dropped; 3317 } 3318 3319 static int macsec_get_iflink(const struct net_device *dev) 3320 { 3321 return macsec_priv(dev)->real_dev->ifindex; 3322 } 3323 3324 static const struct net_device_ops macsec_netdev_ops = { 3325 .ndo_init = macsec_dev_init, 3326 .ndo_uninit = macsec_dev_uninit, 3327 .ndo_open = macsec_dev_open, 3328 .ndo_stop = macsec_dev_stop, 3329 .ndo_fix_features = macsec_fix_features, 3330 .ndo_change_mtu = macsec_change_mtu, 3331 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 3332 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 3333 .ndo_set_mac_address = macsec_set_mac_address, 3334 .ndo_start_xmit = macsec_start_xmit, 3335 .ndo_get_stats64 = macsec_get_stats64, 3336 .ndo_get_iflink = macsec_get_iflink, 3337 }; 3338 3339 static const struct device_type macsec_type = { 3340 .name = "macsec", 3341 }; 3342 3343 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 3344 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 3345 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 3346 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 3347 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 3348 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 3349 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 3350 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 3351 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 3352 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 3353 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 3354 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 3355 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 3356 }; 3357 3358 static void macsec_free_netdev(struct net_device *dev) 3359 { 3360 struct macsec_dev *macsec = macsec_priv(dev); 3361 3362 free_percpu(macsec->stats); 3363 free_percpu(macsec->secy.tx_sc.stats); 3364 3365 } 3366 3367 static void macsec_setup(struct net_device *dev) 3368 { 3369 ether_setup(dev); 3370 dev->min_mtu = 0; 3371 dev->max_mtu = ETH_MAX_MTU; 3372 dev->priv_flags |= IFF_NO_QUEUE; 3373 dev->netdev_ops = &macsec_netdev_ops; 3374 dev->needs_free_netdev = true; 3375 dev->priv_destructor = macsec_free_netdev; 3376 SET_NETDEV_DEVTYPE(dev, &macsec_type); 3377 3378 eth_zero_addr(dev->broadcast); 3379 } 3380 3381 static int macsec_changelink_common(struct net_device *dev, 3382 struct nlattr *data[]) 3383 { 3384 struct macsec_secy *secy; 3385 struct macsec_tx_sc *tx_sc; 3386 3387 secy = &macsec_priv(dev)->secy; 3388 tx_sc = &secy->tx_sc; 3389 3390 if (data[IFLA_MACSEC_ENCODING_SA]) { 3391 struct macsec_tx_sa *tx_sa; 3392 3393 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3394 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 3395 3396 secy->operational = tx_sa && tx_sa->active; 3397 } 3398 3399 if (data[IFLA_MACSEC_WINDOW]) 3400 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3401 3402 if (data[IFLA_MACSEC_ENCRYPT]) 3403 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3404 3405 if (data[IFLA_MACSEC_PROTECT]) 3406 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3407 3408 if (data[IFLA_MACSEC_INC_SCI]) 3409 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3410 3411 if (data[IFLA_MACSEC_ES]) 3412 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3413 3414 if (data[IFLA_MACSEC_SCB]) 3415 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3416 3417 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3418 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3419 3420 if (data[IFLA_MACSEC_VALIDATION]) 3421 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3422 3423 if (data[IFLA_MACSEC_CIPHER_SUITE]) { 3424 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) { 3425 case MACSEC_CIPHER_ID_GCM_AES_128: 3426 case MACSEC_DEFAULT_CIPHER_ID: 3427 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3428 break; 3429 case MACSEC_CIPHER_ID_GCM_AES_256: 3430 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3431 break; 3432 default: 3433 return -EINVAL; 3434 } 3435 } 3436 3437 return 0; 3438 } 3439 3440 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3441 struct nlattr *data[], 3442 struct netlink_ext_ack *extack) 3443 { 3444 struct macsec_dev *macsec = macsec_priv(dev); 3445 struct macsec_tx_sa tx_sc; 3446 struct macsec_secy secy; 3447 int ret; 3448 3449 if (!data) 3450 return 0; 3451 3452 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3453 data[IFLA_MACSEC_ICV_LEN] || 3454 data[IFLA_MACSEC_SCI] || 3455 data[IFLA_MACSEC_PORT]) 3456 return -EINVAL; 3457 3458 /* Keep a copy of unmodified secy and tx_sc, in case the offload 3459 * propagation fails, to revert macsec_changelink_common. 3460 */ 3461 memcpy(&secy, &macsec->secy, sizeof(secy)); 3462 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc)); 3463 3464 ret = macsec_changelink_common(dev, data); 3465 if (ret) 3466 return ret; 3467 3468 /* If h/w offloading is available, propagate to the device */ 3469 if (macsec_is_offloaded(macsec)) { 3470 const struct macsec_ops *ops; 3471 struct macsec_context ctx; 3472 int ret; 3473 3474 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3475 if (!ops) { 3476 ret = -EOPNOTSUPP; 3477 goto cleanup; 3478 } 3479 3480 ctx.secy = &macsec->secy; 3481 ret = macsec_offload(ops->mdo_upd_secy, &ctx); 3482 if (ret) 3483 goto cleanup; 3484 } 3485 3486 return 0; 3487 3488 cleanup: 3489 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc)); 3490 memcpy(&macsec->secy, &secy, sizeof(secy)); 3491 3492 return ret; 3493 } 3494 3495 static void macsec_del_dev(struct macsec_dev *macsec) 3496 { 3497 int i; 3498 3499 while (macsec->secy.rx_sc) { 3500 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 3501 3502 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 3503 free_rx_sc(rx_sc); 3504 } 3505 3506 for (i = 0; i < MACSEC_NUM_AN; i++) { 3507 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 3508 3509 if (sa) { 3510 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 3511 clear_tx_sa(sa); 3512 } 3513 } 3514 } 3515 3516 static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 3517 { 3518 struct macsec_dev *macsec = macsec_priv(dev); 3519 struct net_device *real_dev = macsec->real_dev; 3520 3521 unregister_netdevice_queue(dev, head); 3522 list_del_rcu(&macsec->secys); 3523 macsec_del_dev(macsec); 3524 netdev_upper_dev_unlink(real_dev, dev); 3525 3526 macsec_generation++; 3527 } 3528 3529 static void macsec_dellink(struct net_device *dev, struct list_head *head) 3530 { 3531 struct macsec_dev *macsec = macsec_priv(dev); 3532 struct net_device *real_dev = macsec->real_dev; 3533 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3534 3535 /* If h/w offloading is available, propagate to the device */ 3536 if (macsec_is_offloaded(macsec)) { 3537 const struct macsec_ops *ops; 3538 struct macsec_context ctx; 3539 3540 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3541 if (ops) { 3542 ctx.secy = &macsec->secy; 3543 macsec_offload(ops->mdo_del_secy, &ctx); 3544 } 3545 } 3546 3547 macsec_common_dellink(dev, head); 3548 3549 if (list_empty(&rxd->secys)) { 3550 netdev_rx_handler_unregister(real_dev); 3551 kfree(rxd); 3552 } 3553 } 3554 3555 static int register_macsec_dev(struct net_device *real_dev, 3556 struct net_device *dev) 3557 { 3558 struct macsec_dev *macsec = macsec_priv(dev); 3559 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 3560 3561 if (!rxd) { 3562 int err; 3563 3564 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 3565 if (!rxd) 3566 return -ENOMEM; 3567 3568 INIT_LIST_HEAD(&rxd->secys); 3569 3570 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 3571 rxd); 3572 if (err < 0) { 3573 kfree(rxd); 3574 return err; 3575 } 3576 } 3577 3578 list_add_tail_rcu(&macsec->secys, &rxd->secys); 3579 return 0; 3580 } 3581 3582 static bool sci_exists(struct net_device *dev, sci_t sci) 3583 { 3584 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 3585 struct macsec_dev *macsec; 3586 3587 list_for_each_entry(macsec, &rxd->secys, secys) { 3588 if (macsec->secy.sci == sci) 3589 return true; 3590 } 3591 3592 return false; 3593 } 3594 3595 static sci_t dev_to_sci(struct net_device *dev, __be16 port) 3596 { 3597 return make_sci(dev->dev_addr, port); 3598 } 3599 3600 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 3601 { 3602 struct macsec_dev *macsec = macsec_priv(dev); 3603 struct macsec_secy *secy = &macsec->secy; 3604 3605 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 3606 if (!macsec->stats) 3607 return -ENOMEM; 3608 3609 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 3610 if (!secy->tx_sc.stats) { 3611 free_percpu(macsec->stats); 3612 return -ENOMEM; 3613 } 3614 3615 if (sci == MACSEC_UNDEF_SCI) 3616 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3617 3618 secy->netdev = dev; 3619 secy->operational = true; 3620 secy->key_len = DEFAULT_SAK_LEN; 3621 secy->icv_len = icv_len; 3622 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 3623 secy->protect_frames = true; 3624 secy->replay_protect = false; 3625 3626 secy->sci = sci; 3627 secy->tx_sc.active = true; 3628 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 3629 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 3630 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 3631 secy->tx_sc.end_station = false; 3632 secy->tx_sc.scb = false; 3633 3634 return 0; 3635 } 3636 3637 static int macsec_newlink(struct net *net, struct net_device *dev, 3638 struct nlattr *tb[], struct nlattr *data[], 3639 struct netlink_ext_ack *extack) 3640 { 3641 struct macsec_dev *macsec = macsec_priv(dev); 3642 struct net_device *real_dev; 3643 int err; 3644 sci_t sci; 3645 u8 icv_len = DEFAULT_ICV_LEN; 3646 rx_handler_func_t *rx_handler; 3647 3648 if (!tb[IFLA_LINK]) 3649 return -EINVAL; 3650 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 3651 if (!real_dev) 3652 return -ENODEV; 3653 3654 dev->priv_flags |= IFF_MACSEC; 3655 3656 macsec->real_dev = real_dev; 3657 3658 /* MACsec offloading is off by default */ 3659 macsec->offload = MACSEC_OFFLOAD_OFF; 3660 3661 if (data && data[IFLA_MACSEC_ICV_LEN]) 3662 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3663 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 3664 3665 rx_handler = rtnl_dereference(real_dev->rx_handler); 3666 if (rx_handler && rx_handler != macsec_handle_frame) 3667 return -EBUSY; 3668 3669 err = register_netdevice(dev); 3670 if (err < 0) 3671 return err; 3672 3673 err = netdev_upper_dev_link(real_dev, dev, extack); 3674 if (err < 0) 3675 goto unregister; 3676 3677 /* need to be already registered so that ->init has run and 3678 * the MAC addr is set 3679 */ 3680 if (data && data[IFLA_MACSEC_SCI]) 3681 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 3682 else if (data && data[IFLA_MACSEC_PORT]) 3683 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 3684 else 3685 sci = dev_to_sci(dev, MACSEC_PORT_ES); 3686 3687 if (rx_handler && sci_exists(real_dev, sci)) { 3688 err = -EBUSY; 3689 goto unlink; 3690 } 3691 3692 err = macsec_add_dev(dev, sci, icv_len); 3693 if (err) 3694 goto unlink; 3695 3696 if (data) { 3697 err = macsec_changelink_common(dev, data); 3698 if (err) 3699 goto del_dev; 3700 } 3701 3702 err = register_macsec_dev(real_dev, dev); 3703 if (err < 0) 3704 goto del_dev; 3705 3706 netif_stacked_transfer_operstate(real_dev, dev); 3707 linkwatch_fire_event(dev); 3708 3709 macsec_generation++; 3710 3711 return 0; 3712 3713 del_dev: 3714 macsec_del_dev(macsec); 3715 unlink: 3716 netdev_upper_dev_unlink(real_dev, dev); 3717 unregister: 3718 unregister_netdevice(dev); 3719 return err; 3720 } 3721 3722 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], 3723 struct netlink_ext_ack *extack) 3724 { 3725 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 3726 u8 icv_len = DEFAULT_ICV_LEN; 3727 int flag; 3728 bool es, scb, sci; 3729 3730 if (!data) 3731 return 0; 3732 3733 if (data[IFLA_MACSEC_CIPHER_SUITE]) 3734 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 3735 3736 if (data[IFLA_MACSEC_ICV_LEN]) { 3737 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 3738 if (icv_len != DEFAULT_ICV_LEN) { 3739 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 3740 struct crypto_aead *dummy_tfm; 3741 3742 dummy_tfm = macsec_alloc_tfm(dummy_key, 3743 DEFAULT_SAK_LEN, 3744 icv_len); 3745 if (IS_ERR(dummy_tfm)) 3746 return PTR_ERR(dummy_tfm); 3747 crypto_free_aead(dummy_tfm); 3748 } 3749 } 3750 3751 switch (csid) { 3752 case MACSEC_CIPHER_ID_GCM_AES_128: 3753 case MACSEC_CIPHER_ID_GCM_AES_256: 3754 case MACSEC_DEFAULT_CIPHER_ID: 3755 if (icv_len < MACSEC_MIN_ICV_LEN || 3756 icv_len > MACSEC_STD_ICV_LEN) 3757 return -EINVAL; 3758 break; 3759 default: 3760 return -EINVAL; 3761 } 3762 3763 if (data[IFLA_MACSEC_ENCODING_SA]) { 3764 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 3765 return -EINVAL; 3766 } 3767 3768 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 3769 flag < IFLA_MACSEC_VALIDATION; 3770 flag++) { 3771 if (data[flag]) { 3772 if (nla_get_u8(data[flag]) > 1) 3773 return -EINVAL; 3774 } 3775 } 3776 3777 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 3778 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 3779 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 3780 3781 if ((sci && (scb || es)) || (scb && es)) 3782 return -EINVAL; 3783 3784 if (data[IFLA_MACSEC_VALIDATION] && 3785 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 3786 return -EINVAL; 3787 3788 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 3789 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 3790 !data[IFLA_MACSEC_WINDOW]) 3791 return -EINVAL; 3792 3793 return 0; 3794 } 3795 3796 static struct net *macsec_get_link_net(const struct net_device *dev) 3797 { 3798 return dev_net(macsec_priv(dev)->real_dev); 3799 } 3800 3801 static size_t macsec_get_size(const struct net_device *dev) 3802 { 3803 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ 3804 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ 3805 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ 3806 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ 3807 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ 3808 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ 3809 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ 3810 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ 3811 nla_total_size(1) + /* IFLA_MACSEC_ES */ 3812 nla_total_size(1) + /* IFLA_MACSEC_SCB */ 3813 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ 3814 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ 3815 0; 3816 } 3817 3818 static int macsec_fill_info(struct sk_buff *skb, 3819 const struct net_device *dev) 3820 { 3821 struct macsec_secy *secy = &macsec_priv(dev)->secy; 3822 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3823 u64 csid; 3824 3825 switch (secy->key_len) { 3826 case MACSEC_GCM_AES_128_SAK_LEN: 3827 csid = MACSEC_DEFAULT_CIPHER_ID; 3828 break; 3829 case MACSEC_GCM_AES_256_SAK_LEN: 3830 csid = MACSEC_CIPHER_ID_GCM_AES_256; 3831 break; 3832 default: 3833 goto nla_put_failure; 3834 } 3835 3836 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 3837 IFLA_MACSEC_PAD) || 3838 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 3839 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 3840 csid, IFLA_MACSEC_PAD) || 3841 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 3842 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 3843 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 3844 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 3845 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 3846 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 3847 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 3848 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 3849 0) 3850 goto nla_put_failure; 3851 3852 if (secy->replay_protect) { 3853 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 3854 goto nla_put_failure; 3855 } 3856 3857 return 0; 3858 3859 nla_put_failure: 3860 return -EMSGSIZE; 3861 } 3862 3863 static struct rtnl_link_ops macsec_link_ops __read_mostly = { 3864 .kind = "macsec", 3865 .priv_size = sizeof(struct macsec_dev), 3866 .maxtype = IFLA_MACSEC_MAX, 3867 .policy = macsec_rtnl_policy, 3868 .setup = macsec_setup, 3869 .validate = macsec_validate_attr, 3870 .newlink = macsec_newlink, 3871 .changelink = macsec_changelink, 3872 .dellink = macsec_dellink, 3873 .get_size = macsec_get_size, 3874 .fill_info = macsec_fill_info, 3875 .get_link_net = macsec_get_link_net, 3876 }; 3877 3878 static bool is_macsec_master(struct net_device *dev) 3879 { 3880 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 3881 } 3882 3883 static int macsec_notify(struct notifier_block *this, unsigned long event, 3884 void *ptr) 3885 { 3886 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 3887 LIST_HEAD(head); 3888 3889 if (!is_macsec_master(real_dev)) 3890 return NOTIFY_DONE; 3891 3892 switch (event) { 3893 case NETDEV_DOWN: 3894 case NETDEV_UP: 3895 case NETDEV_CHANGE: { 3896 struct macsec_dev *m, *n; 3897 struct macsec_rxh_data *rxd; 3898 3899 rxd = macsec_data_rtnl(real_dev); 3900 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 3901 struct net_device *dev = m->secy.netdev; 3902 3903 netif_stacked_transfer_operstate(real_dev, dev); 3904 } 3905 break; 3906 } 3907 case NETDEV_UNREGISTER: { 3908 struct macsec_dev *m, *n; 3909 struct macsec_rxh_data *rxd; 3910 3911 rxd = macsec_data_rtnl(real_dev); 3912 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 3913 macsec_common_dellink(m->secy.netdev, &head); 3914 } 3915 3916 netdev_rx_handler_unregister(real_dev); 3917 kfree(rxd); 3918 3919 unregister_netdevice_many(&head); 3920 break; 3921 } 3922 case NETDEV_CHANGEMTU: { 3923 struct macsec_dev *m; 3924 struct macsec_rxh_data *rxd; 3925 3926 rxd = macsec_data_rtnl(real_dev); 3927 list_for_each_entry(m, &rxd->secys, secys) { 3928 struct net_device *dev = m->secy.netdev; 3929 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 3930 macsec_extra_len(true)); 3931 3932 if (dev->mtu > mtu) 3933 dev_set_mtu(dev, mtu); 3934 } 3935 } 3936 } 3937 3938 return NOTIFY_OK; 3939 } 3940 3941 static struct notifier_block macsec_notifier = { 3942 .notifier_call = macsec_notify, 3943 }; 3944 3945 static int __init macsec_init(void) 3946 { 3947 int err; 3948 3949 pr_info("MACsec IEEE 802.1AE\n"); 3950 err = register_netdevice_notifier(&macsec_notifier); 3951 if (err) 3952 return err; 3953 3954 err = rtnl_link_register(&macsec_link_ops); 3955 if (err) 3956 goto notifier; 3957 3958 err = genl_register_family(&macsec_fam); 3959 if (err) 3960 goto rtnl; 3961 3962 return 0; 3963 3964 rtnl: 3965 rtnl_link_unregister(&macsec_link_ops); 3966 notifier: 3967 unregister_netdevice_notifier(&macsec_notifier); 3968 return err; 3969 } 3970 3971 static void __exit macsec_exit(void) 3972 { 3973 genl_unregister_family(&macsec_fam); 3974 rtnl_link_unregister(&macsec_link_ops); 3975 unregister_netdevice_notifier(&macsec_notifier); 3976 rcu_barrier(); 3977 } 3978 3979 module_init(macsec_init); 3980 module_exit(macsec_exit); 3981 3982 MODULE_ALIAS_RTNL_LINK("macsec"); 3983 MODULE_ALIAS_GENL_FAMILY("macsec"); 3984 3985 MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 3986 MODULE_LICENSE("GPL v2"); 3987