1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * drivers/net/macsec.c - MACsec device 4 * 5 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net> 6 */ 7 8#include <linux/types.h> 9#include <linux/skbuff.h> 10#include <linux/socket.h> 11#include <linux/module.h> 12#include <crypto/aead.h> 13#include <linux/etherdevice.h> 14#include <linux/netdevice.h> 15#include <linux/rtnetlink.h> 16#include <linux/refcount.h> 17#include <net/genetlink.h> 18#include <net/sock.h> 19#include <net/gro_cells.h> 20#include <net/macsec.h> 21#include <net/dst_metadata.h> 22#include <linux/phy.h> 23#include <linux/byteorder/generic.h> 24#include <linux/if_arp.h> 25 26#include <uapi/linux/if_macsec.h> 27 28/* SecTAG length = macsec_eth_header without the optional SCI */ 29#define MACSEC_TAG_LEN 6 30 31struct macsec_eth_header { 32 struct ethhdr eth; 33 /* SecTAG */ 34 u8 tci_an; 35#if defined(__LITTLE_ENDIAN_BITFIELD) 36 u8 short_length:6, 37 unused:2; 38#elif defined(__BIG_ENDIAN_BITFIELD) 39 u8 unused:2, 40 short_length:6; 41#else 42#error "Please fix <asm/byteorder.h>" 43#endif 44 __be32 packet_number; 45 u8 secure_channel_id[8]; /* optional */ 46} __packed; 47 48/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */ 49#define MIN_NON_SHORT_LEN 48 50 51#define GCM_AES_IV_LEN 12 52 53#define for_each_rxsc(secy, sc) \ 54 for (sc = rcu_dereference_bh(secy->rx_sc); \ 55 sc; \ 56 sc = rcu_dereference_bh(sc->next)) 57#define for_each_rxsc_rtnl(secy, sc) \ 58 for (sc = rtnl_dereference(secy->rx_sc); \ 59 sc; \ 60 sc = rtnl_dereference(sc->next)) 61 62#define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31))) 63 64struct gcm_iv_xpn { 65 union { 66 u8 short_secure_channel_id[4]; 67 ssci_t ssci; 68 }; 69 __be64 pn; 70} __packed; 71 72struct gcm_iv { 73 union { 74 u8 secure_channel_id[8]; 75 sci_t sci; 76 }; 77 __be32 pn; 78}; 79 80#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT 81 82struct pcpu_secy_stats { 83 struct macsec_dev_stats stats; 84 struct u64_stats_sync syncp; 85}; 86 87/** 88 * struct macsec_dev - private data 89 * @secy: SecY config 90 * @real_dev: pointer to underlying netdevice 91 * @dev_tracker: refcount tracker for @real_dev reference 92 * @stats: MACsec device stats 93 * @secys: linked list of SecY's on the underlying device 94 * @gro_cells: pointer to the Generic Receive Offload cell 95 * @offload: status of offloading on the MACsec device 96 * @insert_tx_tag: when offloading, device requires to insert an 97 * additional tag 98 */ 99struct macsec_dev { 100 struct macsec_secy secy; 101 struct net_device *real_dev; 102 netdevice_tracker dev_tracker; 103 struct pcpu_secy_stats __percpu *stats; 104 struct list_head secys; 105 struct gro_cells gro_cells; 106 enum macsec_offload offload; 107 bool insert_tx_tag; 108}; 109 110/** 111 * struct macsec_rxh_data - rx_handler private argument 112 * @secys: linked list of SecY's on this underlying device 113 */ 114struct macsec_rxh_data { 115 struct list_head secys; 116}; 117 118static struct macsec_dev *macsec_priv(const struct net_device *dev) 119{ 120 return (struct macsec_dev *)netdev_priv(dev); 121} 122 123static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev) 124{ 125 return rcu_dereference_bh(dev->rx_handler_data); 126} 127 128static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev) 129{ 130 return rtnl_dereference(dev->rx_handler_data); 131} 132 133struct macsec_cb { 134 struct aead_request *req; 135 union { 136 struct macsec_tx_sa *tx_sa; 137 struct macsec_rx_sa *rx_sa; 138 }; 139 u8 assoc_num; 140 bool valid; 141 bool has_sci; 142}; 143 144static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr) 145{ 146 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr); 147 148 if (!sa || !sa->active) 149 return NULL; 150 151 if (!refcount_inc_not_zero(&sa->refcnt)) 152 return NULL; 153 154 return sa; 155} 156 157static struct macsec_rx_sa *macsec_active_rxsa_get(struct macsec_rx_sc *rx_sc) 158{ 159 struct macsec_rx_sa *sa = NULL; 160 int an; 161 162 for (an = 0; an < MACSEC_NUM_AN; an++) { 163 sa = macsec_rxsa_get(rx_sc->sa[an]); 164 if (sa) 165 break; 166 } 167 return sa; 168} 169 170static void free_rx_sc_rcu(struct rcu_head *head) 171{ 172 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head); 173 174 free_percpu(rx_sc->stats); 175 kfree(rx_sc); 176} 177 178static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc) 179{ 180 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL; 181} 182 183static void macsec_rxsc_put(struct macsec_rx_sc *sc) 184{ 185 if (refcount_dec_and_test(&sc->refcnt)) 186 call_rcu(&sc->rcu_head, free_rx_sc_rcu); 187} 188 189static void free_rxsa(struct rcu_head *head) 190{ 191 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu); 192 193 crypto_free_aead(sa->key.tfm); 194 free_percpu(sa->stats); 195 kfree(sa); 196} 197 198static void macsec_rxsa_put(struct macsec_rx_sa *sa) 199{ 200 if (refcount_dec_and_test(&sa->refcnt)) 201 call_rcu(&sa->rcu, free_rxsa); 202} 203 204static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr) 205{ 206 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr); 207 208 if (!sa || !sa->active) 209 return NULL; 210 211 if (!refcount_inc_not_zero(&sa->refcnt)) 212 return NULL; 213 214 return sa; 215} 216 217static void free_txsa(struct rcu_head *head) 218{ 219 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu); 220 221 crypto_free_aead(sa->key.tfm); 222 free_percpu(sa->stats); 223 kfree(sa); 224} 225 226static void macsec_txsa_put(struct macsec_tx_sa *sa) 227{ 228 if (refcount_dec_and_test(&sa->refcnt)) 229 call_rcu(&sa->rcu, free_txsa); 230} 231 232static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) 233{ 234 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); 235 return (struct macsec_cb *)skb->cb; 236} 237 238#define MACSEC_PORT_SCB (0x0000) 239#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL) 240#define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff) 241 242#define MACSEC_GCM_AES_128_SAK_LEN 16 243#define MACSEC_GCM_AES_256_SAK_LEN 32 244 245#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN 246#define DEFAULT_XPN false 247#define DEFAULT_SEND_SCI true 248#define DEFAULT_ENCRYPT false 249#define DEFAULT_ENCODING_SA 0 250#define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1)) 251 252static sci_t make_sci(const u8 *addr, __be16 port) 253{ 254 sci_t sci; 255 256 memcpy(&sci, addr, ETH_ALEN); 257 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); 258 259 return sci; 260} 261 262static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present) 263{ 264 sci_t sci; 265 266 if (sci_present) 267 memcpy(&sci, hdr->secure_channel_id, 268 sizeof(hdr->secure_channel_id)); 269 else 270 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); 271 272 return sci; 273} 274 275static unsigned int macsec_sectag_len(bool sci_present) 276{ 277 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); 278} 279 280static unsigned int macsec_hdr_len(bool sci_present) 281{ 282 return macsec_sectag_len(sci_present) + ETH_HLEN; 283} 284 285static unsigned int macsec_extra_len(bool sci_present) 286{ 287 return macsec_sectag_len(sci_present) + sizeof(__be16); 288} 289 290/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ 291static void macsec_fill_sectag(struct macsec_eth_header *h, 292 const struct macsec_secy *secy, u32 pn, 293 bool sci_present) 294{ 295 const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 296 297 memset(&h->tci_an, 0, macsec_sectag_len(sci_present)); 298 h->eth.h_proto = htons(ETH_P_MACSEC); 299 300 if (sci_present) { 301 h->tci_an |= MACSEC_TCI_SC; 302 memcpy(&h->secure_channel_id, &secy->sci, 303 sizeof(h->secure_channel_id)); 304 } else { 305 if (tx_sc->end_station) 306 h->tci_an |= MACSEC_TCI_ES; 307 if (tx_sc->scb) 308 h->tci_an |= MACSEC_TCI_SCB; 309 } 310 311 h->packet_number = htonl(pn); 312 313 /* with GCM, C/E clear for !encrypt, both set for encrypt */ 314 if (tx_sc->encrypt) 315 h->tci_an |= MACSEC_TCI_CONFID; 316 else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN) 317 h->tci_an |= MACSEC_TCI_C; 318 319 h->tci_an |= tx_sc->encoding_sa; 320} 321 322static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) 323{ 324 if (data_len < MIN_NON_SHORT_LEN) 325 h->short_length = data_len; 326} 327 328/* Checks if a MACsec interface is being offloaded to an hardware engine */ 329static bool macsec_is_offloaded(struct macsec_dev *macsec) 330{ 331 if (macsec->offload == MACSEC_OFFLOAD_MAC || 332 macsec->offload == MACSEC_OFFLOAD_PHY) 333 return true; 334 335 return false; 336} 337 338/* Checks if underlying layers implement MACsec offloading functions. */ 339static bool macsec_check_offload(enum macsec_offload offload, 340 struct macsec_dev *macsec) 341{ 342 if (!macsec || !macsec->real_dev) 343 return false; 344 345 if (offload == MACSEC_OFFLOAD_PHY) 346 return macsec->real_dev->phydev && 347 macsec->real_dev->phydev->macsec_ops; 348 else if (offload == MACSEC_OFFLOAD_MAC) 349 return macsec->real_dev->features & NETIF_F_HW_MACSEC && 350 macsec->real_dev->macsec_ops; 351 352 return false; 353} 354 355static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload, 356 struct macsec_dev *macsec, 357 struct macsec_context *ctx) 358{ 359 if (ctx) { 360 memset(ctx, 0, sizeof(*ctx)); 361 ctx->offload = offload; 362 363 if (offload == MACSEC_OFFLOAD_PHY) 364 ctx->phydev = macsec->real_dev->phydev; 365 else if (offload == MACSEC_OFFLOAD_MAC) 366 ctx->netdev = macsec->real_dev; 367 } 368 369 if (offload == MACSEC_OFFLOAD_PHY) 370 return macsec->real_dev->phydev->macsec_ops; 371 else 372 return macsec->real_dev->macsec_ops; 373} 374 375/* Returns a pointer to the MACsec ops struct if any and updates the MACsec 376 * context device reference if provided. 377 */ 378static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec, 379 struct macsec_context *ctx) 380{ 381 if (!macsec_check_offload(macsec->offload, macsec)) 382 return NULL; 383 384 return __macsec_get_ops(macsec->offload, macsec, ctx); 385} 386 387/* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */ 388static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn) 389{ 390 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; 391 int len = skb->len - 2 * ETH_ALEN; 392 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; 393 394 /* a) It comprises at least 17 octets */ 395 if (skb->len <= 16) 396 return false; 397 398 /* b) MACsec EtherType: already checked */ 399 400 /* c) V bit is clear */ 401 if (h->tci_an & MACSEC_TCI_VERSION) 402 return false; 403 404 /* d) ES or SCB => !SC */ 405 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && 406 (h->tci_an & MACSEC_TCI_SC)) 407 return false; 408 409 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ 410 if (h->unused) 411 return false; 412 413 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */ 414 if (!h->packet_number && !xpn) 415 return false; 416 417 /* length check, f) g) h) i) */ 418 if (h->short_length) 419 return len == extra_len + h->short_length; 420 return len >= extra_len + MIN_NON_SHORT_LEN; 421} 422 423#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) 424#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN 425 426static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn, 427 salt_t salt) 428{ 429 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv; 430 431 gcm_iv->ssci = ssci ^ salt.ssci; 432 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn; 433} 434 435static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) 436{ 437 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; 438 439 gcm_iv->sci = sci; 440 gcm_iv->pn = htonl(pn); 441} 442 443static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) 444{ 445 return (struct macsec_eth_header *)skb_mac_header(skb); 446} 447 448static void __macsec_pn_wrapped(struct macsec_secy *secy, 449 struct macsec_tx_sa *tx_sa) 450{ 451 pr_debug("PN wrapped, transitioning to !oper\n"); 452 tx_sa->active = false; 453 if (secy->protect_frames) 454 secy->operational = false; 455} 456 457void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa) 458{ 459 spin_lock_bh(&tx_sa->lock); 460 __macsec_pn_wrapped(secy, tx_sa); 461 spin_unlock_bh(&tx_sa->lock); 462} 463EXPORT_SYMBOL_GPL(macsec_pn_wrapped); 464 465static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa, 466 struct macsec_secy *secy) 467{ 468 pn_t pn; 469 470 spin_lock_bh(&tx_sa->lock); 471 472 pn = tx_sa->next_pn_halves; 473 if (secy->xpn) 474 tx_sa->next_pn++; 475 else 476 tx_sa->next_pn_halves.lower++; 477 478 if (tx_sa->next_pn == 0) 479 __macsec_pn_wrapped(secy, tx_sa); 480 spin_unlock_bh(&tx_sa->lock); 481 482 return pn; 483} 484 485static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) 486{ 487 struct macsec_dev *macsec = netdev_priv(dev); 488 489 skb->dev = macsec->real_dev; 490 skb_reset_mac_header(skb); 491 skb->protocol = eth_hdr(skb)->h_proto; 492} 493 494static unsigned int macsec_msdu_len(struct sk_buff *skb) 495{ 496 struct macsec_dev *macsec = macsec_priv(skb->dev); 497 struct macsec_secy *secy = &macsec->secy; 498 bool sci_present = macsec_skb_cb(skb)->has_sci; 499 500 return skb->len - macsec_hdr_len(sci_present) - secy->icv_len; 501} 502 503static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, 504 struct macsec_tx_sa *tx_sa) 505{ 506 unsigned int msdu_len = macsec_msdu_len(skb); 507 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); 508 509 u64_stats_update_begin(&txsc_stats->syncp); 510 if (tx_sc->encrypt) { 511 txsc_stats->stats.OutOctetsEncrypted += msdu_len; 512 txsc_stats->stats.OutPktsEncrypted++; 513 this_cpu_inc(tx_sa->stats->OutPktsEncrypted); 514 } else { 515 txsc_stats->stats.OutOctetsProtected += msdu_len; 516 txsc_stats->stats.OutPktsProtected++; 517 this_cpu_inc(tx_sa->stats->OutPktsProtected); 518 } 519 u64_stats_update_end(&txsc_stats->syncp); 520} 521 522static void count_tx(struct net_device *dev, int ret, int len) 523{ 524 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) 525 dev_sw_netstats_tx_add(dev, 1, len); 526} 527 528static void macsec_encrypt_done(void *data, int err) 529{ 530 struct sk_buff *skb = data; 531 struct net_device *dev = skb->dev; 532 struct macsec_dev *macsec = macsec_priv(dev); 533 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; 534 int len, ret; 535 536 aead_request_free(macsec_skb_cb(skb)->req); 537 538 rcu_read_lock_bh(); 539 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 540 /* packet is encrypted/protected so tx_bytes must be calculated */ 541 len = macsec_msdu_len(skb) + 2 * ETH_ALEN; 542 macsec_encrypt_finish(skb, dev); 543 ret = dev_queue_xmit(skb); 544 count_tx(dev, ret, len); 545 rcu_read_unlock_bh(); 546 547 macsec_txsa_put(sa); 548 dev_put(dev); 549} 550 551static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, 552 unsigned char **iv, 553 struct scatterlist **sg, 554 int num_frags) 555{ 556 size_t size, iv_offset, sg_offset; 557 struct aead_request *req; 558 void *tmp; 559 560 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); 561 iv_offset = size; 562 size += GCM_AES_IV_LEN; 563 564 size = ALIGN(size, __alignof__(struct scatterlist)); 565 sg_offset = size; 566 size += sizeof(struct scatterlist) * num_frags; 567 568 tmp = kmalloc(size, GFP_ATOMIC); 569 if (!tmp) 570 return NULL; 571 572 *iv = (unsigned char *)(tmp + iv_offset); 573 *sg = (struct scatterlist *)(tmp + sg_offset); 574 req = tmp; 575 576 aead_request_set_tfm(req, tfm); 577 578 return req; 579} 580 581static struct sk_buff *macsec_encrypt(struct sk_buff *skb, 582 struct net_device *dev) 583{ 584 int ret; 585 struct scatterlist *sg; 586 struct sk_buff *trailer; 587 unsigned char *iv; 588 struct ethhdr *eth; 589 struct macsec_eth_header *hh; 590 size_t unprotected_len; 591 struct aead_request *req; 592 struct macsec_secy *secy; 593 struct macsec_tx_sc *tx_sc; 594 struct macsec_tx_sa *tx_sa; 595 struct macsec_dev *macsec = macsec_priv(dev); 596 bool sci_present; 597 pn_t pn; 598 599 secy = &macsec->secy; 600 tx_sc = &secy->tx_sc; 601 602 /* 10.5.1 TX SA assignment */ 603 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); 604 if (!tx_sa) { 605 secy->operational = false; 606 kfree_skb(skb); 607 return ERR_PTR(-EINVAL); 608 } 609 610 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || 611 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { 612 struct sk_buff *nskb = skb_copy_expand(skb, 613 MACSEC_NEEDED_HEADROOM, 614 MACSEC_NEEDED_TAILROOM, 615 GFP_ATOMIC); 616 if (likely(nskb)) { 617 consume_skb(skb); 618 skb = nskb; 619 } else { 620 macsec_txsa_put(tx_sa); 621 kfree_skb(skb); 622 return ERR_PTR(-ENOMEM); 623 } 624 } else { 625 skb = skb_unshare(skb, GFP_ATOMIC); 626 if (!skb) { 627 macsec_txsa_put(tx_sa); 628 return ERR_PTR(-ENOMEM); 629 } 630 } 631 632 unprotected_len = skb->len; 633 eth = eth_hdr(skb); 634 sci_present = macsec_send_sci(secy); 635 hh = skb_push(skb, macsec_extra_len(sci_present)); 636 memmove(hh, eth, 2 * ETH_ALEN); 637 638 pn = tx_sa_update_pn(tx_sa, secy); 639 if (pn.full64 == 0) { 640 macsec_txsa_put(tx_sa); 641 kfree_skb(skb); 642 return ERR_PTR(-ENOLINK); 643 } 644 macsec_fill_sectag(hh, secy, pn.lower, sci_present); 645 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); 646 647 skb_put(skb, secy->icv_len); 648 649 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { 650 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 651 652 u64_stats_update_begin(&secy_stats->syncp); 653 secy_stats->stats.OutPktsTooLong++; 654 u64_stats_update_end(&secy_stats->syncp); 655 656 macsec_txsa_put(tx_sa); 657 kfree_skb(skb); 658 return ERR_PTR(-EINVAL); 659 } 660 661 ret = skb_cow_data(skb, 0, &trailer); 662 if (unlikely(ret < 0)) { 663 macsec_txsa_put(tx_sa); 664 kfree_skb(skb); 665 return ERR_PTR(ret); 666 } 667 668 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret); 669 if (!req) { 670 macsec_txsa_put(tx_sa); 671 kfree_skb(skb); 672 return ERR_PTR(-ENOMEM); 673 } 674 675 if (secy->xpn) 676 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt); 677 else 678 macsec_fill_iv(iv, secy->sci, pn.lower); 679 680 sg_init_table(sg, ret); 681 ret = skb_to_sgvec(skb, sg, 0, skb->len); 682 if (unlikely(ret < 0)) { 683 aead_request_free(req); 684 macsec_txsa_put(tx_sa); 685 kfree_skb(skb); 686 return ERR_PTR(ret); 687 } 688 689 if (tx_sc->encrypt) { 690 int len = skb->len - macsec_hdr_len(sci_present) - 691 secy->icv_len; 692 aead_request_set_crypt(req, sg, sg, len, iv); 693 aead_request_set_ad(req, macsec_hdr_len(sci_present)); 694 } else { 695 aead_request_set_crypt(req, sg, sg, 0, iv); 696 aead_request_set_ad(req, skb->len - secy->icv_len); 697 } 698 699 macsec_skb_cb(skb)->req = req; 700 macsec_skb_cb(skb)->tx_sa = tx_sa; 701 macsec_skb_cb(skb)->has_sci = sci_present; 702 aead_request_set_callback(req, 0, macsec_encrypt_done, skb); 703 704 dev_hold(skb->dev); 705 ret = crypto_aead_encrypt(req); 706 if (ret == -EINPROGRESS) { 707 return ERR_PTR(ret); 708 } else if (ret != 0) { 709 dev_put(skb->dev); 710 kfree_skb(skb); 711 aead_request_free(req); 712 macsec_txsa_put(tx_sa); 713 return ERR_PTR(-EINVAL); 714 } 715 716 dev_put(skb->dev); 717 aead_request_free(req); 718 macsec_txsa_put(tx_sa); 719 720 return skb; 721} 722 723static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) 724{ 725 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 726 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); 727 struct macsec_eth_header *hdr = macsec_ethhdr(skb); 728 u32 lowest_pn = 0; 729 730 spin_lock(&rx_sa->lock); 731 if (rx_sa->next_pn_halves.lower >= secy->replay_window) 732 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window; 733 734 /* Now perform replay protection check again 735 * (see IEEE 802.1AE-2006 figure 10-5) 736 */ 737 if (secy->replay_protect && pn < lowest_pn && 738 (!secy->xpn || pn_same_half(pn, lowest_pn))) { 739 spin_unlock(&rx_sa->lock); 740 u64_stats_update_begin(&rxsc_stats->syncp); 741 rxsc_stats->stats.InPktsLate++; 742 u64_stats_update_end(&rxsc_stats->syncp); 743 DEV_STATS_INC(secy->netdev, rx_dropped); 744 return false; 745 } 746 747 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { 748 unsigned int msdu_len = macsec_msdu_len(skb); 749 u64_stats_update_begin(&rxsc_stats->syncp); 750 if (hdr->tci_an & MACSEC_TCI_E) 751 rxsc_stats->stats.InOctetsDecrypted += msdu_len; 752 else 753 rxsc_stats->stats.InOctetsValidated += msdu_len; 754 u64_stats_update_end(&rxsc_stats->syncp); 755 } 756 757 if (!macsec_skb_cb(skb)->valid) { 758 spin_unlock(&rx_sa->lock); 759 760 /* 10.6.5 */ 761 if (hdr->tci_an & MACSEC_TCI_C || 762 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 763 u64_stats_update_begin(&rxsc_stats->syncp); 764 rxsc_stats->stats.InPktsNotValid++; 765 u64_stats_update_end(&rxsc_stats->syncp); 766 this_cpu_inc(rx_sa->stats->InPktsNotValid); 767 DEV_STATS_INC(secy->netdev, rx_errors); 768 return false; 769 } 770 771 u64_stats_update_begin(&rxsc_stats->syncp); 772 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { 773 rxsc_stats->stats.InPktsInvalid++; 774 this_cpu_inc(rx_sa->stats->InPktsInvalid); 775 } else if (pn < lowest_pn) { 776 rxsc_stats->stats.InPktsDelayed++; 777 } else { 778 rxsc_stats->stats.InPktsUnchecked++; 779 } 780 u64_stats_update_end(&rxsc_stats->syncp); 781 } else { 782 u64_stats_update_begin(&rxsc_stats->syncp); 783 if (pn < lowest_pn) { 784 rxsc_stats->stats.InPktsDelayed++; 785 } else { 786 rxsc_stats->stats.InPktsOK++; 787 this_cpu_inc(rx_sa->stats->InPktsOK); 788 } 789 u64_stats_update_end(&rxsc_stats->syncp); 790 791 // Instead of "pn >=" - to support pn overflow in xpn 792 if (pn + 1 > rx_sa->next_pn_halves.lower) { 793 rx_sa->next_pn_halves.lower = pn + 1; 794 } else if (secy->xpn && 795 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) { 796 rx_sa->next_pn_halves.upper++; 797 rx_sa->next_pn_halves.lower = pn + 1; 798 } 799 800 spin_unlock(&rx_sa->lock); 801 } 802 803 return true; 804} 805 806static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) 807{ 808 skb->pkt_type = PACKET_HOST; 809 skb->protocol = eth_type_trans(skb, dev); 810 811 skb_reset_network_header(skb); 812 if (!skb_transport_header_was_set(skb)) 813 skb_reset_transport_header(skb); 814 skb_reset_mac_len(skb); 815} 816 817static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) 818{ 819 skb->ip_summed = CHECKSUM_NONE; 820 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); 821 skb_pull(skb, hdr_len); 822 pskb_trim_unique(skb, skb->len - icv_len); 823} 824 825static void count_rx(struct net_device *dev, int len) 826{ 827 dev_sw_netstats_rx_add(dev, len); 828} 829 830static void macsec_decrypt_done(void *data, int err) 831{ 832 struct sk_buff *skb = data; 833 struct net_device *dev = skb->dev; 834 struct macsec_dev *macsec = macsec_priv(dev); 835 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; 836 struct macsec_rx_sc *rx_sc = rx_sa->sc; 837 int len; 838 u32 pn; 839 840 aead_request_free(macsec_skb_cb(skb)->req); 841 842 if (!err) 843 macsec_skb_cb(skb)->valid = true; 844 845 rcu_read_lock_bh(); 846 pn = ntohl(macsec_ethhdr(skb)->packet_number); 847 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { 848 rcu_read_unlock_bh(); 849 kfree_skb(skb); 850 goto out; 851 } 852 853 macsec_finalize_skb(skb, macsec->secy.icv_len, 854 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 855 len = skb->len; 856 macsec_reset_skb(skb, macsec->secy.netdev); 857 858 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS) 859 count_rx(dev, len); 860 861 rcu_read_unlock_bh(); 862 863out: 864 macsec_rxsa_put(rx_sa); 865 macsec_rxsc_put(rx_sc); 866 dev_put(dev); 867} 868 869static struct sk_buff *macsec_decrypt(struct sk_buff *skb, 870 struct net_device *dev, 871 struct macsec_rx_sa *rx_sa, 872 sci_t sci, 873 struct macsec_secy *secy) 874{ 875 int ret; 876 struct scatterlist *sg; 877 struct sk_buff *trailer; 878 unsigned char *iv; 879 struct aead_request *req; 880 struct macsec_eth_header *hdr; 881 u32 hdr_pn; 882 u16 icv_len = secy->icv_len; 883 884 macsec_skb_cb(skb)->valid = false; 885 skb = skb_share_check(skb, GFP_ATOMIC); 886 if (!skb) 887 return ERR_PTR(-ENOMEM); 888 889 ret = skb_cow_data(skb, 0, &trailer); 890 if (unlikely(ret < 0)) { 891 kfree_skb(skb); 892 return ERR_PTR(ret); 893 } 894 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret); 895 if (!req) { 896 kfree_skb(skb); 897 return ERR_PTR(-ENOMEM); 898 } 899 900 hdr = (struct macsec_eth_header *)skb->data; 901 hdr_pn = ntohl(hdr->packet_number); 902 903 if (secy->xpn) { 904 pn_t recovered_pn = rx_sa->next_pn_halves; 905 906 recovered_pn.lower = hdr_pn; 907 if (hdr_pn < rx_sa->next_pn_halves.lower && 908 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower)) 909 recovered_pn.upper++; 910 911 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64, 912 rx_sa->key.salt); 913 } else { 914 macsec_fill_iv(iv, sci, hdr_pn); 915 } 916 917 sg_init_table(sg, ret); 918 ret = skb_to_sgvec(skb, sg, 0, skb->len); 919 if (unlikely(ret < 0)) { 920 aead_request_free(req); 921 kfree_skb(skb); 922 return ERR_PTR(ret); 923 } 924 925 if (hdr->tci_an & MACSEC_TCI_E) { 926 /* confidentiality: ethernet + macsec header 927 * authenticated, encrypted payload 928 */ 929 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); 930 931 aead_request_set_crypt(req, sg, sg, len, iv); 932 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); 933 skb = skb_unshare(skb, GFP_ATOMIC); 934 if (!skb) { 935 aead_request_free(req); 936 return ERR_PTR(-ENOMEM); 937 } 938 } else { 939 /* integrity only: all headers + data authenticated */ 940 aead_request_set_crypt(req, sg, sg, icv_len, iv); 941 aead_request_set_ad(req, skb->len - icv_len); 942 } 943 944 macsec_skb_cb(skb)->req = req; 945 skb->dev = dev; 946 aead_request_set_callback(req, 0, macsec_decrypt_done, skb); 947 948 dev_hold(dev); 949 ret = crypto_aead_decrypt(req); 950 if (ret == -EINPROGRESS) { 951 return ERR_PTR(ret); 952 } else if (ret != 0) { 953 /* decryption/authentication failed 954 * 10.6 if validateFrames is disabled, deliver anyway 955 */ 956 if (ret != -EBADMSG) { 957 kfree_skb(skb); 958 skb = ERR_PTR(ret); 959 } 960 } else { 961 macsec_skb_cb(skb)->valid = true; 962 } 963 dev_put(dev); 964 965 aead_request_free(req); 966 967 return skb; 968} 969 970static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) 971{ 972 struct macsec_rx_sc *rx_sc; 973 974 for_each_rxsc(secy, rx_sc) { 975 if (rx_sc->sci == sci) 976 return rx_sc; 977 } 978 979 return NULL; 980} 981 982static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) 983{ 984 struct macsec_rx_sc *rx_sc; 985 986 for_each_rxsc_rtnl(secy, rx_sc) { 987 if (rx_sc->sci == sci) 988 return rx_sc; 989 } 990 991 return NULL; 992} 993 994static enum rx_handler_result handle_not_macsec(struct sk_buff *skb) 995{ 996 /* Deliver to the uncontrolled port by default */ 997 enum rx_handler_result ret = RX_HANDLER_PASS; 998 struct ethhdr *hdr = eth_hdr(skb); 999 struct metadata_dst *md_dst; 1000 struct macsec_rxh_data *rxd; 1001 struct macsec_dev *macsec; 1002 1003 rcu_read_lock(); 1004 rxd = macsec_data_rcu(skb->dev); 1005 md_dst = skb_metadata_dst(skb); 1006 1007 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1008 struct sk_buff *nskb; 1009 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); 1010 struct net_device *ndev = macsec->secy.netdev; 1011 1012 /* If h/w offloading is enabled, HW decodes frames and strips 1013 * the SecTAG, so we have to deduce which port to deliver to. 1014 */ 1015 if (macsec_is_offloaded(macsec) && netif_running(ndev)) { 1016 struct macsec_rx_sc *rx_sc = NULL; 1017 1018 if (md_dst && md_dst->type == METADATA_MACSEC) 1019 rx_sc = find_rx_sc(&macsec->secy, md_dst->u.macsec_info.sci); 1020 1021 if (md_dst && md_dst->type == METADATA_MACSEC && !rx_sc) 1022 continue; 1023 1024 if (ether_addr_equal_64bits(hdr->h_dest, 1025 ndev->dev_addr)) { 1026 /* exact match, divert skb to this port */ 1027 skb->dev = ndev; 1028 skb->pkt_type = PACKET_HOST; 1029 ret = RX_HANDLER_ANOTHER; 1030 goto out; 1031 } else if (is_multicast_ether_addr_64bits( 1032 hdr->h_dest)) { 1033 /* multicast frame, deliver on this port too */ 1034 nskb = skb_clone(skb, GFP_ATOMIC); 1035 if (!nskb) 1036 break; 1037 1038 nskb->dev = ndev; 1039 if (ether_addr_equal_64bits(hdr->h_dest, 1040 ndev->broadcast)) 1041 nskb->pkt_type = PACKET_BROADCAST; 1042 else 1043 nskb->pkt_type = PACKET_MULTICAST; 1044 1045 __netif_rx(nskb); 1046 } else if (rx_sc || ndev->flags & IFF_PROMISC) { 1047 skb->dev = ndev; 1048 skb->pkt_type = PACKET_HOST; 1049 ret = RX_HANDLER_ANOTHER; 1050 goto out; 1051 } 1052 1053 continue; 1054 } 1055 1056 /* 10.6 If the management control validateFrames is not 1057 * Strict, frames without a SecTAG are received, counted, and 1058 * delivered to the Controlled Port 1059 */ 1060 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1061 u64_stats_update_begin(&secy_stats->syncp); 1062 secy_stats->stats.InPktsNoTag++; 1063 u64_stats_update_end(&secy_stats->syncp); 1064 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1065 continue; 1066 } 1067 1068 /* deliver on this port */ 1069 nskb = skb_clone(skb, GFP_ATOMIC); 1070 if (!nskb) 1071 break; 1072 1073 nskb->dev = ndev; 1074 1075 if (__netif_rx(nskb) == NET_RX_SUCCESS) { 1076 u64_stats_update_begin(&secy_stats->syncp); 1077 secy_stats->stats.InPktsUntagged++; 1078 u64_stats_update_end(&secy_stats->syncp); 1079 } 1080 } 1081 1082out: 1083 rcu_read_unlock(); 1084 return ret; 1085} 1086 1087static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) 1088{ 1089 struct sk_buff *skb = *pskb; 1090 struct net_device *dev = skb->dev; 1091 struct macsec_eth_header *hdr; 1092 struct macsec_secy *secy = NULL; 1093 struct macsec_rx_sc *rx_sc; 1094 struct macsec_rx_sa *rx_sa; 1095 struct macsec_rxh_data *rxd; 1096 struct macsec_dev *macsec; 1097 unsigned int len; 1098 sci_t sci; 1099 u32 hdr_pn; 1100 bool cbit; 1101 struct pcpu_rx_sc_stats *rxsc_stats; 1102 struct pcpu_secy_stats *secy_stats; 1103 bool pulled_sci; 1104 int ret; 1105 1106 if (skb_headroom(skb) < ETH_HLEN) 1107 goto drop_direct; 1108 1109 hdr = macsec_ethhdr(skb); 1110 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) 1111 return handle_not_macsec(skb); 1112 1113 skb = skb_unshare(skb, GFP_ATOMIC); 1114 *pskb = skb; 1115 if (!skb) 1116 return RX_HANDLER_CONSUMED; 1117 1118 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); 1119 if (!pulled_sci) { 1120 if (!pskb_may_pull(skb, macsec_extra_len(false))) 1121 goto drop_direct; 1122 } 1123 1124 hdr = macsec_ethhdr(skb); 1125 1126 /* Frames with a SecTAG that has the TCI E bit set but the C 1127 * bit clear are discarded, as this reserved encoding is used 1128 * to identify frames with a SecTAG that are not to be 1129 * delivered to the Controlled Port. 1130 */ 1131 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) 1132 return RX_HANDLER_PASS; 1133 1134 /* now, pull the extra length */ 1135 if (hdr->tci_an & MACSEC_TCI_SC) { 1136 if (!pulled_sci) 1137 goto drop_direct; 1138 } 1139 1140 /* ethernet header is part of crypto processing */ 1141 skb_push(skb, ETH_HLEN); 1142 1143 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); 1144 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; 1145 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci); 1146 1147 rcu_read_lock(); 1148 rxd = macsec_data_rcu(skb->dev); 1149 1150 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1151 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); 1152 1153 sc = sc ? macsec_rxsc_get(sc) : NULL; 1154 1155 if (sc) { 1156 secy = &macsec->secy; 1157 rx_sc = sc; 1158 break; 1159 } 1160 } 1161 1162 if (!secy) 1163 goto nosci; 1164 1165 dev = secy->netdev; 1166 macsec = macsec_priv(dev); 1167 secy_stats = this_cpu_ptr(macsec->stats); 1168 rxsc_stats = this_cpu_ptr(rx_sc->stats); 1169 1170 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) { 1171 u64_stats_update_begin(&secy_stats->syncp); 1172 secy_stats->stats.InPktsBadTag++; 1173 u64_stats_update_end(&secy_stats->syncp); 1174 DEV_STATS_INC(secy->netdev, rx_errors); 1175 goto drop_nosa; 1176 } 1177 1178 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); 1179 if (!rx_sa) { 1180 /* 10.6.1 if the SA is not in use */ 1181 1182 /* If validateFrames is Strict or the C bit in the 1183 * SecTAG is set, discard 1184 */ 1185 struct macsec_rx_sa *active_rx_sa = macsec_active_rxsa_get(rx_sc); 1186 if (hdr->tci_an & MACSEC_TCI_C || 1187 secy->validate_frames == MACSEC_VALIDATE_STRICT) { 1188 u64_stats_update_begin(&rxsc_stats->syncp); 1189 rxsc_stats->stats.InPktsNotUsingSA++; 1190 u64_stats_update_end(&rxsc_stats->syncp); 1191 DEV_STATS_INC(secy->netdev, rx_errors); 1192 if (active_rx_sa) 1193 this_cpu_inc(active_rx_sa->stats->InPktsNotUsingSA); 1194 goto drop_nosa; 1195 } 1196 1197 /* not Strict, the frame (with the SecTAG and ICV 1198 * removed) is delivered to the Controlled Port. 1199 */ 1200 u64_stats_update_begin(&rxsc_stats->syncp); 1201 rxsc_stats->stats.InPktsUnusedSA++; 1202 u64_stats_update_end(&rxsc_stats->syncp); 1203 if (active_rx_sa) 1204 this_cpu_inc(active_rx_sa->stats->InPktsUnusedSA); 1205 goto deliver; 1206 } 1207 1208 /* First, PN check to avoid decrypting obviously wrong packets */ 1209 hdr_pn = ntohl(hdr->packet_number); 1210 if (secy->replay_protect) { 1211 bool late; 1212 1213 spin_lock(&rx_sa->lock); 1214 late = rx_sa->next_pn_halves.lower >= secy->replay_window && 1215 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window); 1216 1217 if (secy->xpn) 1218 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn); 1219 spin_unlock(&rx_sa->lock); 1220 1221 if (late) { 1222 u64_stats_update_begin(&rxsc_stats->syncp); 1223 rxsc_stats->stats.InPktsLate++; 1224 u64_stats_update_end(&rxsc_stats->syncp); 1225 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1226 goto drop; 1227 } 1228 } 1229 1230 macsec_skb_cb(skb)->rx_sa = rx_sa; 1231 1232 /* Disabled && !changed text => skip validation */ 1233 if (hdr->tci_an & MACSEC_TCI_C || 1234 secy->validate_frames != MACSEC_VALIDATE_DISABLED) 1235 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); 1236 1237 if (IS_ERR(skb)) { 1238 /* the decrypt callback needs the reference */ 1239 if (PTR_ERR(skb) != -EINPROGRESS) { 1240 macsec_rxsa_put(rx_sa); 1241 macsec_rxsc_put(rx_sc); 1242 } 1243 rcu_read_unlock(); 1244 *pskb = NULL; 1245 return RX_HANDLER_CONSUMED; 1246 } 1247 1248 if (!macsec_post_decrypt(skb, secy, hdr_pn)) 1249 goto drop; 1250 1251deliver: 1252 macsec_finalize_skb(skb, secy->icv_len, 1253 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1254 len = skb->len; 1255 macsec_reset_skb(skb, secy->netdev); 1256 1257 if (rx_sa) 1258 macsec_rxsa_put(rx_sa); 1259 macsec_rxsc_put(rx_sc); 1260 1261 skb_orphan(skb); 1262 ret = gro_cells_receive(&macsec->gro_cells, skb); 1263 if (ret == NET_RX_SUCCESS) 1264 count_rx(dev, len); 1265 else 1266 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1267 1268 rcu_read_unlock(); 1269 1270 *pskb = NULL; 1271 return RX_HANDLER_CONSUMED; 1272 1273drop: 1274 macsec_rxsa_put(rx_sa); 1275drop_nosa: 1276 macsec_rxsc_put(rx_sc); 1277 rcu_read_unlock(); 1278drop_direct: 1279 kfree_skb(skb); 1280 *pskb = NULL; 1281 return RX_HANDLER_CONSUMED; 1282 1283nosci: 1284 /* 10.6.1 if the SC is not found */ 1285 cbit = !!(hdr->tci_an & MACSEC_TCI_C); 1286 if (!cbit) 1287 macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN, 1288 macsec_extra_len(macsec_skb_cb(skb)->has_sci)); 1289 1290 list_for_each_entry_rcu(macsec, &rxd->secys, secys) { 1291 struct sk_buff *nskb; 1292 1293 secy_stats = this_cpu_ptr(macsec->stats); 1294 1295 /* If validateFrames is Strict or the C bit in the 1296 * SecTAG is set, discard 1297 */ 1298 if (cbit || 1299 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { 1300 u64_stats_update_begin(&secy_stats->syncp); 1301 secy_stats->stats.InPktsNoSCI++; 1302 u64_stats_update_end(&secy_stats->syncp); 1303 DEV_STATS_INC(macsec->secy.netdev, rx_errors); 1304 continue; 1305 } 1306 1307 /* not strict, the frame (with the SecTAG and ICV 1308 * removed) is delivered to the Controlled Port. 1309 */ 1310 nskb = skb_clone(skb, GFP_ATOMIC); 1311 if (!nskb) 1312 break; 1313 1314 macsec_reset_skb(nskb, macsec->secy.netdev); 1315 1316 ret = __netif_rx(nskb); 1317 if (ret == NET_RX_SUCCESS) { 1318 u64_stats_update_begin(&secy_stats->syncp); 1319 secy_stats->stats.InPktsUnknownSCI++; 1320 u64_stats_update_end(&secy_stats->syncp); 1321 } else { 1322 DEV_STATS_INC(macsec->secy.netdev, rx_dropped); 1323 } 1324 } 1325 1326 rcu_read_unlock(); 1327 *pskb = skb; 1328 return RX_HANDLER_PASS; 1329} 1330 1331static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) 1332{ 1333 struct crypto_aead *tfm; 1334 int ret; 1335 1336 tfm = crypto_alloc_aead("gcm(aes)", 0, 0); 1337 1338 if (IS_ERR(tfm)) 1339 return tfm; 1340 1341 ret = crypto_aead_setkey(tfm, key, key_len); 1342 if (ret < 0) 1343 goto fail; 1344 1345 ret = crypto_aead_setauthsize(tfm, icv_len); 1346 if (ret < 0) 1347 goto fail; 1348 1349 return tfm; 1350fail: 1351 crypto_free_aead(tfm); 1352 return ERR_PTR(ret); 1353} 1354 1355static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, 1356 int icv_len) 1357{ 1358 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); 1359 if (!rx_sa->stats) 1360 return -ENOMEM; 1361 1362 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1363 if (IS_ERR(rx_sa->key.tfm)) { 1364 free_percpu(rx_sa->stats); 1365 return PTR_ERR(rx_sa->key.tfm); 1366 } 1367 1368 rx_sa->ssci = MACSEC_UNDEF_SSCI; 1369 rx_sa->active = false; 1370 rx_sa->next_pn = 1; 1371 refcount_set(&rx_sa->refcnt, 1); 1372 spin_lock_init(&rx_sa->lock); 1373 1374 return 0; 1375} 1376 1377static void clear_rx_sa(struct macsec_rx_sa *rx_sa) 1378{ 1379 rx_sa->active = false; 1380 1381 macsec_rxsa_put(rx_sa); 1382} 1383 1384static void free_rx_sc(struct macsec_rx_sc *rx_sc) 1385{ 1386 int i; 1387 1388 for (i = 0; i < MACSEC_NUM_AN; i++) { 1389 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); 1390 1391 RCU_INIT_POINTER(rx_sc->sa[i], NULL); 1392 if (sa) 1393 clear_rx_sa(sa); 1394 } 1395 1396 macsec_rxsc_put(rx_sc); 1397} 1398 1399static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) 1400{ 1401 struct macsec_rx_sc *rx_sc, __rcu **rx_scp; 1402 1403 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); 1404 rx_sc; 1405 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { 1406 if (rx_sc->sci == sci) { 1407 if (rx_sc->active) 1408 secy->n_rx_sc--; 1409 rcu_assign_pointer(*rx_scp, rx_sc->next); 1410 return rx_sc; 1411 } 1412 } 1413 1414 return NULL; 1415} 1416 1417static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci, 1418 bool active) 1419{ 1420 struct macsec_rx_sc *rx_sc; 1421 struct macsec_dev *macsec; 1422 struct net_device *real_dev = macsec_priv(dev)->real_dev; 1423 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 1424 struct macsec_secy *secy; 1425 1426 list_for_each_entry(macsec, &rxd->secys, secys) { 1427 if (find_rx_sc_rtnl(&macsec->secy, sci)) 1428 return ERR_PTR(-EEXIST); 1429 } 1430 1431 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL); 1432 if (!rx_sc) 1433 return ERR_PTR(-ENOMEM); 1434 1435 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); 1436 if (!rx_sc->stats) { 1437 kfree(rx_sc); 1438 return ERR_PTR(-ENOMEM); 1439 } 1440 1441 rx_sc->sci = sci; 1442 rx_sc->active = active; 1443 refcount_set(&rx_sc->refcnt, 1); 1444 1445 secy = &macsec_priv(dev)->secy; 1446 rcu_assign_pointer(rx_sc->next, secy->rx_sc); 1447 rcu_assign_pointer(secy->rx_sc, rx_sc); 1448 1449 if (rx_sc->active) 1450 secy->n_rx_sc++; 1451 1452 return rx_sc; 1453} 1454 1455static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, 1456 int icv_len) 1457{ 1458 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); 1459 if (!tx_sa->stats) 1460 return -ENOMEM; 1461 1462 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); 1463 if (IS_ERR(tx_sa->key.tfm)) { 1464 free_percpu(tx_sa->stats); 1465 return PTR_ERR(tx_sa->key.tfm); 1466 } 1467 1468 tx_sa->ssci = MACSEC_UNDEF_SSCI; 1469 tx_sa->active = false; 1470 refcount_set(&tx_sa->refcnt, 1); 1471 spin_lock_init(&tx_sa->lock); 1472 1473 return 0; 1474} 1475 1476static void clear_tx_sa(struct macsec_tx_sa *tx_sa) 1477{ 1478 tx_sa->active = false; 1479 1480 macsec_txsa_put(tx_sa); 1481} 1482 1483static struct genl_family macsec_fam; 1484 1485static struct net_device *get_dev_from_nl(struct net *net, 1486 struct nlattr **attrs) 1487{ 1488 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); 1489 struct net_device *dev; 1490 1491 dev = __dev_get_by_index(net, ifindex); 1492 if (!dev) 1493 return ERR_PTR(-ENODEV); 1494 1495 if (!netif_is_macsec(dev)) 1496 return ERR_PTR(-ENODEV); 1497 1498 return dev; 1499} 1500 1501static enum macsec_offload nla_get_offload(const struct nlattr *nla) 1502{ 1503 return (__force enum macsec_offload)nla_get_u8(nla); 1504} 1505 1506static sci_t nla_get_sci(const struct nlattr *nla) 1507{ 1508 return (__force sci_t)nla_get_u64(nla); 1509} 1510 1511static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, 1512 int padattr) 1513{ 1514 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); 1515} 1516 1517static ssci_t nla_get_ssci(const struct nlattr *nla) 1518{ 1519 return (__force ssci_t)nla_get_u32(nla); 1520} 1521 1522static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value) 1523{ 1524 return nla_put_u32(skb, attrtype, (__force u64)value); 1525} 1526 1527static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, 1528 struct nlattr **attrs, 1529 struct nlattr **tb_sa, 1530 struct net_device **devp, 1531 struct macsec_secy **secyp, 1532 struct macsec_tx_sc **scp, 1533 u8 *assoc_num) 1534{ 1535 struct net_device *dev; 1536 struct macsec_secy *secy; 1537 struct macsec_tx_sc *tx_sc; 1538 struct macsec_tx_sa *tx_sa; 1539 1540 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1541 return ERR_PTR(-EINVAL); 1542 1543 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1544 1545 dev = get_dev_from_nl(net, attrs); 1546 if (IS_ERR(dev)) 1547 return ERR_CAST(dev); 1548 1549 if (*assoc_num >= MACSEC_NUM_AN) 1550 return ERR_PTR(-EINVAL); 1551 1552 secy = &macsec_priv(dev)->secy; 1553 tx_sc = &secy->tx_sc; 1554 1555 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); 1556 if (!tx_sa) 1557 return ERR_PTR(-ENODEV); 1558 1559 *devp = dev; 1560 *scp = tx_sc; 1561 *secyp = secy; 1562 return tx_sa; 1563} 1564 1565static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, 1566 struct nlattr **attrs, 1567 struct nlattr **tb_rxsc, 1568 struct net_device **devp, 1569 struct macsec_secy **secyp) 1570{ 1571 struct net_device *dev; 1572 struct macsec_secy *secy; 1573 struct macsec_rx_sc *rx_sc; 1574 sci_t sci; 1575 1576 dev = get_dev_from_nl(net, attrs); 1577 if (IS_ERR(dev)) 1578 return ERR_CAST(dev); 1579 1580 secy = &macsec_priv(dev)->secy; 1581 1582 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 1583 return ERR_PTR(-EINVAL); 1584 1585 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1586 rx_sc = find_rx_sc_rtnl(secy, sci); 1587 if (!rx_sc) 1588 return ERR_PTR(-ENODEV); 1589 1590 *secyp = secy; 1591 *devp = dev; 1592 1593 return rx_sc; 1594} 1595 1596static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, 1597 struct nlattr **attrs, 1598 struct nlattr **tb_rxsc, 1599 struct nlattr **tb_sa, 1600 struct net_device **devp, 1601 struct macsec_secy **secyp, 1602 struct macsec_rx_sc **scp, 1603 u8 *assoc_num) 1604{ 1605 struct macsec_rx_sc *rx_sc; 1606 struct macsec_rx_sa *rx_sa; 1607 1608 if (!tb_sa[MACSEC_SA_ATTR_AN]) 1609 return ERR_PTR(-EINVAL); 1610 1611 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1612 if (*assoc_num >= MACSEC_NUM_AN) 1613 return ERR_PTR(-EINVAL); 1614 1615 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); 1616 if (IS_ERR(rx_sc)) 1617 return ERR_CAST(rx_sc); 1618 1619 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); 1620 if (!rx_sa) 1621 return ERR_PTR(-ENODEV); 1622 1623 *scp = rx_sc; 1624 return rx_sa; 1625} 1626 1627static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { 1628 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, 1629 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, 1630 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, 1631 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED }, 1632}; 1633 1634static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { 1635 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, 1636 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, 1637}; 1638 1639static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { 1640 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, 1641 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, 1642 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4), 1643 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY, 1644 .len = MACSEC_KEYID_LEN, }, 1645 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, 1646 .len = MACSEC_MAX_KEY_LEN, }, 1647 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 }, 1648 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY, 1649 .len = MACSEC_SALT_LEN, }, 1650}; 1651 1652static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = { 1653 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 }, 1654}; 1655 1656/* Offloads an operation to a device driver */ 1657static int macsec_offload(int (* const func)(struct macsec_context *), 1658 struct macsec_context *ctx) 1659{ 1660 int ret; 1661 1662 if (unlikely(!func)) 1663 return 0; 1664 1665 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1666 mutex_lock(&ctx->phydev->lock); 1667 1668 ret = (*func)(ctx); 1669 1670 if (ctx->offload == MACSEC_OFFLOAD_PHY) 1671 mutex_unlock(&ctx->phydev->lock); 1672 1673 return ret; 1674} 1675 1676static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) 1677{ 1678 if (!attrs[MACSEC_ATTR_SA_CONFIG]) 1679 return -EINVAL; 1680 1681 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL)) 1682 return -EINVAL; 1683 1684 return 0; 1685} 1686 1687static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) 1688{ 1689 if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) 1690 return -EINVAL; 1691 1692 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL)) 1693 return -EINVAL; 1694 1695 return 0; 1696} 1697 1698static bool validate_add_rxsa(struct nlattr **attrs) 1699{ 1700 if (!attrs[MACSEC_SA_ATTR_AN] || 1701 !attrs[MACSEC_SA_ATTR_KEY] || 1702 !attrs[MACSEC_SA_ATTR_KEYID]) 1703 return false; 1704 1705 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1706 return false; 1707 1708 if (attrs[MACSEC_SA_ATTR_PN] && 1709 nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 1710 return false; 1711 1712 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1713 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1714 return false; 1715 } 1716 1717 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1718 return false; 1719 1720 return true; 1721} 1722 1723static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) 1724{ 1725 struct net_device *dev; 1726 struct nlattr **attrs = info->attrs; 1727 struct macsec_secy *secy; 1728 struct macsec_rx_sc *rx_sc; 1729 struct macsec_rx_sa *rx_sa; 1730 unsigned char assoc_num; 1731 int pn_len; 1732 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1733 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1734 int err; 1735 1736 if (!attrs[MACSEC_ATTR_IFINDEX]) 1737 return -EINVAL; 1738 1739 if (parse_sa_config(attrs, tb_sa)) 1740 return -EINVAL; 1741 1742 if (parse_rxsc_config(attrs, tb_rxsc)) 1743 return -EINVAL; 1744 1745 if (!validate_add_rxsa(tb_sa)) 1746 return -EINVAL; 1747 1748 rtnl_lock(); 1749 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 1750 if (IS_ERR(rx_sc)) { 1751 rtnl_unlock(); 1752 return PTR_ERR(rx_sc); 1753 } 1754 1755 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 1756 1757 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 1758 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", 1759 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 1760 rtnl_unlock(); 1761 return -EINVAL; 1762 } 1763 1764 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 1765 if (tb_sa[MACSEC_SA_ATTR_PN] && 1766 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 1767 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n", 1768 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 1769 rtnl_unlock(); 1770 return -EINVAL; 1771 } 1772 1773 if (secy->xpn) { 1774 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 1775 rtnl_unlock(); 1776 return -EINVAL; 1777 } 1778 1779 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 1780 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n", 1781 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 1782 MACSEC_SALT_LEN); 1783 rtnl_unlock(); 1784 return -EINVAL; 1785 } 1786 } 1787 1788 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); 1789 if (rx_sa) { 1790 rtnl_unlock(); 1791 return -EBUSY; 1792 } 1793 1794 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); 1795 if (!rx_sa) { 1796 rtnl_unlock(); 1797 return -ENOMEM; 1798 } 1799 1800 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1801 secy->key_len, secy->icv_len); 1802 if (err < 0) { 1803 kfree(rx_sa); 1804 rtnl_unlock(); 1805 return err; 1806 } 1807 1808 if (tb_sa[MACSEC_SA_ATTR_PN]) { 1809 spin_lock_bh(&rx_sa->lock); 1810 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 1811 spin_unlock_bh(&rx_sa->lock); 1812 } 1813 1814 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 1815 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 1816 1817 rx_sa->sc = rx_sc; 1818 1819 if (secy->xpn) { 1820 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 1821 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 1822 MACSEC_SALT_LEN); 1823 } 1824 1825 /* If h/w offloading is available, propagate to the device */ 1826 if (macsec_is_offloaded(netdev_priv(dev))) { 1827 const struct macsec_ops *ops; 1828 struct macsec_context ctx; 1829 1830 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1831 if (!ops) { 1832 err = -EOPNOTSUPP; 1833 goto cleanup; 1834 } 1835 1836 ctx.sa.assoc_num = assoc_num; 1837 ctx.sa.rx_sa = rx_sa; 1838 ctx.secy = secy; 1839 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 1840 secy->key_len); 1841 1842 err = macsec_offload(ops->mdo_add_rxsa, &ctx); 1843 memzero_explicit(ctx.sa.key, secy->key_len); 1844 if (err) 1845 goto cleanup; 1846 } 1847 1848 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 1849 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); 1850 1851 rtnl_unlock(); 1852 1853 return 0; 1854 1855cleanup: 1856 macsec_rxsa_put(rx_sa); 1857 rtnl_unlock(); 1858 return err; 1859} 1860 1861static bool validate_add_rxsc(struct nlattr **attrs) 1862{ 1863 if (!attrs[MACSEC_RXSC_ATTR_SCI]) 1864 return false; 1865 1866 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { 1867 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) 1868 return false; 1869 } 1870 1871 return true; 1872} 1873 1874static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) 1875{ 1876 struct net_device *dev; 1877 sci_t sci = MACSEC_UNDEF_SCI; 1878 struct nlattr **attrs = info->attrs; 1879 struct macsec_rx_sc *rx_sc; 1880 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 1881 struct macsec_secy *secy; 1882 bool active = true; 1883 int ret; 1884 1885 if (!attrs[MACSEC_ATTR_IFINDEX]) 1886 return -EINVAL; 1887 1888 if (parse_rxsc_config(attrs, tb_rxsc)) 1889 return -EINVAL; 1890 1891 if (!validate_add_rxsc(tb_rxsc)) 1892 return -EINVAL; 1893 1894 rtnl_lock(); 1895 dev = get_dev_from_nl(genl_info_net(info), attrs); 1896 if (IS_ERR(dev)) { 1897 rtnl_unlock(); 1898 return PTR_ERR(dev); 1899 } 1900 1901 secy = &macsec_priv(dev)->secy; 1902 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 1903 1904 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) 1905 active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 1906 1907 rx_sc = create_rx_sc(dev, sci, active); 1908 if (IS_ERR(rx_sc)) { 1909 rtnl_unlock(); 1910 return PTR_ERR(rx_sc); 1911 } 1912 1913 if (macsec_is_offloaded(netdev_priv(dev))) { 1914 const struct macsec_ops *ops; 1915 struct macsec_context ctx; 1916 1917 ops = macsec_get_ops(netdev_priv(dev), &ctx); 1918 if (!ops) { 1919 ret = -EOPNOTSUPP; 1920 goto cleanup; 1921 } 1922 1923 ctx.rx_sc = rx_sc; 1924 ctx.secy = secy; 1925 1926 ret = macsec_offload(ops->mdo_add_rxsc, &ctx); 1927 if (ret) 1928 goto cleanup; 1929 } 1930 1931 rtnl_unlock(); 1932 1933 return 0; 1934 1935cleanup: 1936 del_rx_sc(secy, sci); 1937 free_rx_sc(rx_sc); 1938 rtnl_unlock(); 1939 return ret; 1940} 1941 1942static bool validate_add_txsa(struct nlattr **attrs) 1943{ 1944 if (!attrs[MACSEC_SA_ATTR_AN] || 1945 !attrs[MACSEC_SA_ATTR_PN] || 1946 !attrs[MACSEC_SA_ATTR_KEY] || 1947 !attrs[MACSEC_SA_ATTR_KEYID]) 1948 return false; 1949 1950 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 1951 return false; 1952 1953 if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 1954 return false; 1955 1956 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 1957 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 1958 return false; 1959 } 1960 1961 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) 1962 return false; 1963 1964 return true; 1965} 1966 1967static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) 1968{ 1969 struct net_device *dev; 1970 struct nlattr **attrs = info->attrs; 1971 struct macsec_secy *secy; 1972 struct macsec_tx_sc *tx_sc; 1973 struct macsec_tx_sa *tx_sa; 1974 unsigned char assoc_num; 1975 int pn_len; 1976 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 1977 bool was_operational; 1978 int err; 1979 1980 if (!attrs[MACSEC_ATTR_IFINDEX]) 1981 return -EINVAL; 1982 1983 if (parse_sa_config(attrs, tb_sa)) 1984 return -EINVAL; 1985 1986 if (!validate_add_txsa(tb_sa)) 1987 return -EINVAL; 1988 1989 rtnl_lock(); 1990 dev = get_dev_from_nl(genl_info_net(info), attrs); 1991 if (IS_ERR(dev)) { 1992 rtnl_unlock(); 1993 return PTR_ERR(dev); 1994 } 1995 1996 secy = &macsec_priv(dev)->secy; 1997 tx_sc = &secy->tx_sc; 1998 1999 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); 2000 2001 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { 2002 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", 2003 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); 2004 rtnl_unlock(); 2005 return -EINVAL; 2006 } 2007 2008 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2009 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2010 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n", 2011 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2012 rtnl_unlock(); 2013 return -EINVAL; 2014 } 2015 2016 if (secy->xpn) { 2017 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { 2018 rtnl_unlock(); 2019 return -EINVAL; 2020 } 2021 2022 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) { 2023 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n", 2024 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]), 2025 MACSEC_SALT_LEN); 2026 rtnl_unlock(); 2027 return -EINVAL; 2028 } 2029 } 2030 2031 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); 2032 if (tx_sa) { 2033 rtnl_unlock(); 2034 return -EBUSY; 2035 } 2036 2037 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); 2038 if (!tx_sa) { 2039 rtnl_unlock(); 2040 return -ENOMEM; 2041 } 2042 2043 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2044 secy->key_len, secy->icv_len); 2045 if (err < 0) { 2046 kfree(tx_sa); 2047 rtnl_unlock(); 2048 return err; 2049 } 2050 2051 spin_lock_bh(&tx_sa->lock); 2052 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2053 spin_unlock_bh(&tx_sa->lock); 2054 2055 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2056 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2057 2058 was_operational = secy->operational; 2059 if (assoc_num == tx_sc->encoding_sa && tx_sa->active) 2060 secy->operational = true; 2061 2062 if (secy->xpn) { 2063 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); 2064 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], 2065 MACSEC_SALT_LEN); 2066 } 2067 2068 /* If h/w offloading is available, propagate to the device */ 2069 if (macsec_is_offloaded(netdev_priv(dev))) { 2070 const struct macsec_ops *ops; 2071 struct macsec_context ctx; 2072 2073 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2074 if (!ops) { 2075 err = -EOPNOTSUPP; 2076 goto cleanup; 2077 } 2078 2079 ctx.sa.assoc_num = assoc_num; 2080 ctx.sa.tx_sa = tx_sa; 2081 ctx.secy = secy; 2082 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), 2083 secy->key_len); 2084 2085 err = macsec_offload(ops->mdo_add_txsa, &ctx); 2086 memzero_explicit(ctx.sa.key, secy->key_len); 2087 if (err) 2088 goto cleanup; 2089 } 2090 2091 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); 2092 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); 2093 2094 rtnl_unlock(); 2095 2096 return 0; 2097 2098cleanup: 2099 secy->operational = was_operational; 2100 macsec_txsa_put(tx_sa); 2101 rtnl_unlock(); 2102 return err; 2103} 2104 2105static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) 2106{ 2107 struct nlattr **attrs = info->attrs; 2108 struct net_device *dev; 2109 struct macsec_secy *secy; 2110 struct macsec_rx_sc *rx_sc; 2111 struct macsec_rx_sa *rx_sa; 2112 u8 assoc_num; 2113 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2114 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2115 int ret; 2116 2117 if (!attrs[MACSEC_ATTR_IFINDEX]) 2118 return -EINVAL; 2119 2120 if (parse_sa_config(attrs, tb_sa)) 2121 return -EINVAL; 2122 2123 if (parse_rxsc_config(attrs, tb_rxsc)) 2124 return -EINVAL; 2125 2126 rtnl_lock(); 2127 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2128 &dev, &secy, &rx_sc, &assoc_num); 2129 if (IS_ERR(rx_sa)) { 2130 rtnl_unlock(); 2131 return PTR_ERR(rx_sa); 2132 } 2133 2134 if (rx_sa->active) { 2135 rtnl_unlock(); 2136 return -EBUSY; 2137 } 2138 2139 /* If h/w offloading is available, propagate to the device */ 2140 if (macsec_is_offloaded(netdev_priv(dev))) { 2141 const struct macsec_ops *ops; 2142 struct macsec_context ctx; 2143 2144 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2145 if (!ops) { 2146 ret = -EOPNOTSUPP; 2147 goto cleanup; 2148 } 2149 2150 ctx.sa.assoc_num = assoc_num; 2151 ctx.sa.rx_sa = rx_sa; 2152 ctx.secy = secy; 2153 2154 ret = macsec_offload(ops->mdo_del_rxsa, &ctx); 2155 if (ret) 2156 goto cleanup; 2157 } 2158 2159 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); 2160 clear_rx_sa(rx_sa); 2161 2162 rtnl_unlock(); 2163 2164 return 0; 2165 2166cleanup: 2167 rtnl_unlock(); 2168 return ret; 2169} 2170 2171static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) 2172{ 2173 struct nlattr **attrs = info->attrs; 2174 struct net_device *dev; 2175 struct macsec_secy *secy; 2176 struct macsec_rx_sc *rx_sc; 2177 sci_t sci; 2178 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2179 int ret; 2180 2181 if (!attrs[MACSEC_ATTR_IFINDEX]) 2182 return -EINVAL; 2183 2184 if (parse_rxsc_config(attrs, tb_rxsc)) 2185 return -EINVAL; 2186 2187 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) 2188 return -EINVAL; 2189 2190 rtnl_lock(); 2191 dev = get_dev_from_nl(genl_info_net(info), info->attrs); 2192 if (IS_ERR(dev)) { 2193 rtnl_unlock(); 2194 return PTR_ERR(dev); 2195 } 2196 2197 secy = &macsec_priv(dev)->secy; 2198 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); 2199 2200 rx_sc = del_rx_sc(secy, sci); 2201 if (!rx_sc) { 2202 rtnl_unlock(); 2203 return -ENODEV; 2204 } 2205 2206 /* If h/w offloading is available, propagate to the device */ 2207 if (macsec_is_offloaded(netdev_priv(dev))) { 2208 const struct macsec_ops *ops; 2209 struct macsec_context ctx; 2210 2211 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2212 if (!ops) { 2213 ret = -EOPNOTSUPP; 2214 goto cleanup; 2215 } 2216 2217 ctx.rx_sc = rx_sc; 2218 ctx.secy = secy; 2219 ret = macsec_offload(ops->mdo_del_rxsc, &ctx); 2220 if (ret) 2221 goto cleanup; 2222 } 2223 2224 free_rx_sc(rx_sc); 2225 rtnl_unlock(); 2226 2227 return 0; 2228 2229cleanup: 2230 rtnl_unlock(); 2231 return ret; 2232} 2233 2234static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) 2235{ 2236 struct nlattr **attrs = info->attrs; 2237 struct net_device *dev; 2238 struct macsec_secy *secy; 2239 struct macsec_tx_sc *tx_sc; 2240 struct macsec_tx_sa *tx_sa; 2241 u8 assoc_num; 2242 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2243 int ret; 2244 2245 if (!attrs[MACSEC_ATTR_IFINDEX]) 2246 return -EINVAL; 2247 2248 if (parse_sa_config(attrs, tb_sa)) 2249 return -EINVAL; 2250 2251 rtnl_lock(); 2252 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2253 &dev, &secy, &tx_sc, &assoc_num); 2254 if (IS_ERR(tx_sa)) { 2255 rtnl_unlock(); 2256 return PTR_ERR(tx_sa); 2257 } 2258 2259 if (tx_sa->active) { 2260 rtnl_unlock(); 2261 return -EBUSY; 2262 } 2263 2264 /* If h/w offloading is available, propagate to the device */ 2265 if (macsec_is_offloaded(netdev_priv(dev))) { 2266 const struct macsec_ops *ops; 2267 struct macsec_context ctx; 2268 2269 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2270 if (!ops) { 2271 ret = -EOPNOTSUPP; 2272 goto cleanup; 2273 } 2274 2275 ctx.sa.assoc_num = assoc_num; 2276 ctx.sa.tx_sa = tx_sa; 2277 ctx.secy = secy; 2278 2279 ret = macsec_offload(ops->mdo_del_txsa, &ctx); 2280 if (ret) 2281 goto cleanup; 2282 } 2283 2284 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); 2285 clear_tx_sa(tx_sa); 2286 2287 rtnl_unlock(); 2288 2289 return 0; 2290 2291cleanup: 2292 rtnl_unlock(); 2293 return ret; 2294} 2295 2296static bool validate_upd_sa(struct nlattr **attrs) 2297{ 2298 if (!attrs[MACSEC_SA_ATTR_AN] || 2299 attrs[MACSEC_SA_ATTR_KEY] || 2300 attrs[MACSEC_SA_ATTR_KEYID] || 2301 attrs[MACSEC_SA_ATTR_SSCI] || 2302 attrs[MACSEC_SA_ATTR_SALT]) 2303 return false; 2304 2305 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) 2306 return false; 2307 2308 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) 2309 return false; 2310 2311 if (attrs[MACSEC_SA_ATTR_ACTIVE]) { 2312 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) 2313 return false; 2314 } 2315 2316 return true; 2317} 2318 2319static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) 2320{ 2321 struct nlattr **attrs = info->attrs; 2322 struct net_device *dev; 2323 struct macsec_secy *secy; 2324 struct macsec_tx_sc *tx_sc; 2325 struct macsec_tx_sa *tx_sa; 2326 u8 assoc_num; 2327 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2328 bool was_operational, was_active; 2329 pn_t prev_pn; 2330 int ret = 0; 2331 2332 prev_pn.full64 = 0; 2333 2334 if (!attrs[MACSEC_ATTR_IFINDEX]) 2335 return -EINVAL; 2336 2337 if (parse_sa_config(attrs, tb_sa)) 2338 return -EINVAL; 2339 2340 if (!validate_upd_sa(tb_sa)) 2341 return -EINVAL; 2342 2343 rtnl_lock(); 2344 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, 2345 &dev, &secy, &tx_sc, &assoc_num); 2346 if (IS_ERR(tx_sa)) { 2347 rtnl_unlock(); 2348 return PTR_ERR(tx_sa); 2349 } 2350 2351 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2352 int pn_len; 2353 2354 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2355 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2356 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n", 2357 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2358 rtnl_unlock(); 2359 return -EINVAL; 2360 } 2361 2362 spin_lock_bh(&tx_sa->lock); 2363 prev_pn = tx_sa->next_pn_halves; 2364 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2365 spin_unlock_bh(&tx_sa->lock); 2366 } 2367 2368 was_active = tx_sa->active; 2369 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2370 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2371 2372 was_operational = secy->operational; 2373 if (assoc_num == tx_sc->encoding_sa) 2374 secy->operational = tx_sa->active; 2375 2376 /* If h/w offloading is available, propagate to the device */ 2377 if (macsec_is_offloaded(netdev_priv(dev))) { 2378 const struct macsec_ops *ops; 2379 struct macsec_context ctx; 2380 2381 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2382 if (!ops) { 2383 ret = -EOPNOTSUPP; 2384 goto cleanup; 2385 } 2386 2387 ctx.sa.assoc_num = assoc_num; 2388 ctx.sa.tx_sa = tx_sa; 2389 ctx.sa.update_pn = !!prev_pn.full64; 2390 ctx.secy = secy; 2391 2392 ret = macsec_offload(ops->mdo_upd_txsa, &ctx); 2393 if (ret) 2394 goto cleanup; 2395 } 2396 2397 rtnl_unlock(); 2398 2399 return 0; 2400 2401cleanup: 2402 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2403 spin_lock_bh(&tx_sa->lock); 2404 tx_sa->next_pn_halves = prev_pn; 2405 spin_unlock_bh(&tx_sa->lock); 2406 } 2407 tx_sa->active = was_active; 2408 secy->operational = was_operational; 2409 rtnl_unlock(); 2410 return ret; 2411} 2412 2413static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) 2414{ 2415 struct nlattr **attrs = info->attrs; 2416 struct net_device *dev; 2417 struct macsec_secy *secy; 2418 struct macsec_rx_sc *rx_sc; 2419 struct macsec_rx_sa *rx_sa; 2420 u8 assoc_num; 2421 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2422 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; 2423 bool was_active; 2424 pn_t prev_pn; 2425 int ret = 0; 2426 2427 prev_pn.full64 = 0; 2428 2429 if (!attrs[MACSEC_ATTR_IFINDEX]) 2430 return -EINVAL; 2431 2432 if (parse_rxsc_config(attrs, tb_rxsc)) 2433 return -EINVAL; 2434 2435 if (parse_sa_config(attrs, tb_sa)) 2436 return -EINVAL; 2437 2438 if (!validate_upd_sa(tb_sa)) 2439 return -EINVAL; 2440 2441 rtnl_lock(); 2442 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, 2443 &dev, &secy, &rx_sc, &assoc_num); 2444 if (IS_ERR(rx_sa)) { 2445 rtnl_unlock(); 2446 return PTR_ERR(rx_sa); 2447 } 2448 2449 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2450 int pn_len; 2451 2452 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; 2453 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { 2454 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n", 2455 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); 2456 rtnl_unlock(); 2457 return -EINVAL; 2458 } 2459 2460 spin_lock_bh(&rx_sa->lock); 2461 prev_pn = rx_sa->next_pn_halves; 2462 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]); 2463 spin_unlock_bh(&rx_sa->lock); 2464 } 2465 2466 was_active = rx_sa->active; 2467 if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) 2468 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); 2469 2470 /* If h/w offloading is available, propagate to the device */ 2471 if (macsec_is_offloaded(netdev_priv(dev))) { 2472 const struct macsec_ops *ops; 2473 struct macsec_context ctx; 2474 2475 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2476 if (!ops) { 2477 ret = -EOPNOTSUPP; 2478 goto cleanup; 2479 } 2480 2481 ctx.sa.assoc_num = assoc_num; 2482 ctx.sa.rx_sa = rx_sa; 2483 ctx.sa.update_pn = !!prev_pn.full64; 2484 ctx.secy = secy; 2485 2486 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx); 2487 if (ret) 2488 goto cleanup; 2489 } 2490 2491 rtnl_unlock(); 2492 return 0; 2493 2494cleanup: 2495 if (tb_sa[MACSEC_SA_ATTR_PN]) { 2496 spin_lock_bh(&rx_sa->lock); 2497 rx_sa->next_pn_halves = prev_pn; 2498 spin_unlock_bh(&rx_sa->lock); 2499 } 2500 rx_sa->active = was_active; 2501 rtnl_unlock(); 2502 return ret; 2503} 2504 2505static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) 2506{ 2507 struct nlattr **attrs = info->attrs; 2508 struct net_device *dev; 2509 struct macsec_secy *secy; 2510 struct macsec_rx_sc *rx_sc; 2511 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; 2512 unsigned int prev_n_rx_sc; 2513 bool was_active; 2514 int ret; 2515 2516 if (!attrs[MACSEC_ATTR_IFINDEX]) 2517 return -EINVAL; 2518 2519 if (parse_rxsc_config(attrs, tb_rxsc)) 2520 return -EINVAL; 2521 2522 if (!validate_add_rxsc(tb_rxsc)) 2523 return -EINVAL; 2524 2525 rtnl_lock(); 2526 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); 2527 if (IS_ERR(rx_sc)) { 2528 rtnl_unlock(); 2529 return PTR_ERR(rx_sc); 2530 } 2531 2532 was_active = rx_sc->active; 2533 prev_n_rx_sc = secy->n_rx_sc; 2534 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { 2535 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); 2536 2537 if (rx_sc->active != new) 2538 secy->n_rx_sc += new ? 1 : -1; 2539 2540 rx_sc->active = new; 2541 } 2542 2543 /* If h/w offloading is available, propagate to the device */ 2544 if (macsec_is_offloaded(netdev_priv(dev))) { 2545 const struct macsec_ops *ops; 2546 struct macsec_context ctx; 2547 2548 ops = macsec_get_ops(netdev_priv(dev), &ctx); 2549 if (!ops) { 2550 ret = -EOPNOTSUPP; 2551 goto cleanup; 2552 } 2553 2554 ctx.rx_sc = rx_sc; 2555 ctx.secy = secy; 2556 2557 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx); 2558 if (ret) 2559 goto cleanup; 2560 } 2561 2562 rtnl_unlock(); 2563 2564 return 0; 2565 2566cleanup: 2567 secy->n_rx_sc = prev_n_rx_sc; 2568 rx_sc->active = was_active; 2569 rtnl_unlock(); 2570 return ret; 2571} 2572 2573static bool macsec_is_configured(struct macsec_dev *macsec) 2574{ 2575 struct macsec_secy *secy = &macsec->secy; 2576 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 2577 int i; 2578 2579 if (secy->rx_sc) 2580 return true; 2581 2582 for (i = 0; i < MACSEC_NUM_AN; i++) 2583 if (tx_sc->sa[i]) 2584 return true; 2585 2586 return false; 2587} 2588 2589static bool macsec_needs_tx_tag(struct macsec_dev *macsec, 2590 const struct macsec_ops *ops) 2591{ 2592 return macsec->offload == MACSEC_OFFLOAD_PHY && 2593 ops->mdo_insert_tx_tag; 2594} 2595 2596static void macsec_set_head_tail_room(struct net_device *dev) 2597{ 2598 struct macsec_dev *macsec = macsec_priv(dev); 2599 struct net_device *real_dev = macsec->real_dev; 2600 int needed_headroom, needed_tailroom; 2601 const struct macsec_ops *ops; 2602 2603 ops = macsec_get_ops(macsec, NULL); 2604 if (ops) { 2605 needed_headroom = ops->needed_headroom; 2606 needed_tailroom = ops->needed_tailroom; 2607 } else { 2608 needed_headroom = MACSEC_NEEDED_HEADROOM; 2609 needed_tailroom = MACSEC_NEEDED_TAILROOM; 2610 } 2611 2612 dev->needed_headroom = real_dev->needed_headroom + needed_headroom; 2613 dev->needed_tailroom = real_dev->needed_tailroom + needed_tailroom; 2614} 2615 2616static int macsec_update_offload(struct net_device *dev, enum macsec_offload offload) 2617{ 2618 enum macsec_offload prev_offload; 2619 const struct macsec_ops *ops; 2620 struct macsec_context ctx; 2621 struct macsec_dev *macsec; 2622 int ret = 0; 2623 2624 macsec = macsec_priv(dev); 2625 2626 /* Check if the offloading mode is supported by the underlying layers */ 2627 if (offload != MACSEC_OFFLOAD_OFF && 2628 !macsec_check_offload(offload, macsec)) 2629 return -EOPNOTSUPP; 2630 2631 /* Check if the net device is busy. */ 2632 if (netif_running(dev)) 2633 return -EBUSY; 2634 2635 /* Check if the device already has rules configured: we do not support 2636 * rules migration. 2637 */ 2638 if (macsec_is_configured(macsec)) 2639 return -EBUSY; 2640 2641 prev_offload = macsec->offload; 2642 2643 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload, 2644 macsec, &ctx); 2645 if (!ops) 2646 return -EOPNOTSUPP; 2647 2648 macsec->offload = offload; 2649 2650 ctx.secy = &macsec->secy; 2651 ret = offload == MACSEC_OFFLOAD_OFF ? macsec_offload(ops->mdo_del_secy, &ctx) 2652 : macsec_offload(ops->mdo_add_secy, &ctx); 2653 if (ret) { 2654 macsec->offload = prev_offload; 2655 return ret; 2656 } 2657 2658 macsec_set_head_tail_room(dev); 2659 macsec->insert_tx_tag = macsec_needs_tx_tag(macsec, ops); 2660 2661 return ret; 2662} 2663 2664static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info) 2665{ 2666 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1]; 2667 struct nlattr **attrs = info->attrs; 2668 enum macsec_offload offload; 2669 struct macsec_dev *macsec; 2670 struct net_device *dev; 2671 int ret = 0; 2672 2673 if (!attrs[MACSEC_ATTR_IFINDEX]) 2674 return -EINVAL; 2675 2676 if (!attrs[MACSEC_ATTR_OFFLOAD]) 2677 return -EINVAL; 2678 2679 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX, 2680 attrs[MACSEC_ATTR_OFFLOAD], 2681 macsec_genl_offload_policy, NULL)) 2682 return -EINVAL; 2683 2684 rtnl_lock(); 2685 2686 dev = get_dev_from_nl(genl_info_net(info), attrs); 2687 if (IS_ERR(dev)) { 2688 ret = PTR_ERR(dev); 2689 goto out; 2690 } 2691 macsec = macsec_priv(dev); 2692 2693 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) { 2694 ret = -EINVAL; 2695 goto out; 2696 } 2697 2698 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]); 2699 2700 if (macsec->offload != offload) 2701 ret = macsec_update_offload(dev, offload); 2702out: 2703 rtnl_unlock(); 2704 return ret; 2705} 2706 2707static void get_tx_sa_stats(struct net_device *dev, int an, 2708 struct macsec_tx_sa *tx_sa, 2709 struct macsec_tx_sa_stats *sum) 2710{ 2711 struct macsec_dev *macsec = macsec_priv(dev); 2712 int cpu; 2713 2714 /* If h/w offloading is available, propagate to the device */ 2715 if (macsec_is_offloaded(macsec)) { 2716 const struct macsec_ops *ops; 2717 struct macsec_context ctx; 2718 2719 ops = macsec_get_ops(macsec, &ctx); 2720 if (ops) { 2721 ctx.sa.assoc_num = an; 2722 ctx.sa.tx_sa = tx_sa; 2723 ctx.stats.tx_sa_stats = sum; 2724 ctx.secy = &macsec_priv(dev)->secy; 2725 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx); 2726 } 2727 return; 2728 } 2729 2730 for_each_possible_cpu(cpu) { 2731 const struct macsec_tx_sa_stats *stats = 2732 per_cpu_ptr(tx_sa->stats, cpu); 2733 2734 sum->OutPktsProtected += stats->OutPktsProtected; 2735 sum->OutPktsEncrypted += stats->OutPktsEncrypted; 2736 } 2737} 2738 2739static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum) 2740{ 2741 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, 2742 sum->OutPktsProtected) || 2743 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2744 sum->OutPktsEncrypted)) 2745 return -EMSGSIZE; 2746 2747 return 0; 2748} 2749 2750static void get_rx_sa_stats(struct net_device *dev, 2751 struct macsec_rx_sc *rx_sc, int an, 2752 struct macsec_rx_sa *rx_sa, 2753 struct macsec_rx_sa_stats *sum) 2754{ 2755 struct macsec_dev *macsec = macsec_priv(dev); 2756 int cpu; 2757 2758 /* If h/w offloading is available, propagate to the device */ 2759 if (macsec_is_offloaded(macsec)) { 2760 const struct macsec_ops *ops; 2761 struct macsec_context ctx; 2762 2763 ops = macsec_get_ops(macsec, &ctx); 2764 if (ops) { 2765 ctx.sa.assoc_num = an; 2766 ctx.sa.rx_sa = rx_sa; 2767 ctx.stats.rx_sa_stats = sum; 2768 ctx.secy = &macsec_priv(dev)->secy; 2769 ctx.rx_sc = rx_sc; 2770 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx); 2771 } 2772 return; 2773 } 2774 2775 for_each_possible_cpu(cpu) { 2776 const struct macsec_rx_sa_stats *stats = 2777 per_cpu_ptr(rx_sa->stats, cpu); 2778 2779 sum->InPktsOK += stats->InPktsOK; 2780 sum->InPktsInvalid += stats->InPktsInvalid; 2781 sum->InPktsNotValid += stats->InPktsNotValid; 2782 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA; 2783 sum->InPktsUnusedSA += stats->InPktsUnusedSA; 2784 } 2785} 2786 2787static int copy_rx_sa_stats(struct sk_buff *skb, 2788 struct macsec_rx_sa_stats *sum) 2789{ 2790 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) || 2791 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, 2792 sum->InPktsInvalid) || 2793 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, 2794 sum->InPktsNotValid) || 2795 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2796 sum->InPktsNotUsingSA) || 2797 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, 2798 sum->InPktsUnusedSA)) 2799 return -EMSGSIZE; 2800 2801 return 0; 2802} 2803 2804static void get_rx_sc_stats(struct net_device *dev, 2805 struct macsec_rx_sc *rx_sc, 2806 struct macsec_rx_sc_stats *sum) 2807{ 2808 struct macsec_dev *macsec = macsec_priv(dev); 2809 int cpu; 2810 2811 /* If h/w offloading is available, propagate to the device */ 2812 if (macsec_is_offloaded(macsec)) { 2813 const struct macsec_ops *ops; 2814 struct macsec_context ctx; 2815 2816 ops = macsec_get_ops(macsec, &ctx); 2817 if (ops) { 2818 ctx.stats.rx_sc_stats = sum; 2819 ctx.secy = &macsec_priv(dev)->secy; 2820 ctx.rx_sc = rx_sc; 2821 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx); 2822 } 2823 return; 2824 } 2825 2826 for_each_possible_cpu(cpu) { 2827 const struct pcpu_rx_sc_stats *stats; 2828 struct macsec_rx_sc_stats tmp; 2829 unsigned int start; 2830 2831 stats = per_cpu_ptr(rx_sc->stats, cpu); 2832 do { 2833 start = u64_stats_fetch_begin(&stats->syncp); 2834 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2835 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2836 2837 sum->InOctetsValidated += tmp.InOctetsValidated; 2838 sum->InOctetsDecrypted += tmp.InOctetsDecrypted; 2839 sum->InPktsUnchecked += tmp.InPktsUnchecked; 2840 sum->InPktsDelayed += tmp.InPktsDelayed; 2841 sum->InPktsOK += tmp.InPktsOK; 2842 sum->InPktsInvalid += tmp.InPktsInvalid; 2843 sum->InPktsLate += tmp.InPktsLate; 2844 sum->InPktsNotValid += tmp.InPktsNotValid; 2845 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA; 2846 sum->InPktsUnusedSA += tmp.InPktsUnusedSA; 2847 } 2848} 2849 2850static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum) 2851{ 2852 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, 2853 sum->InOctetsValidated, 2854 MACSEC_RXSC_STATS_ATTR_PAD) || 2855 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, 2856 sum->InOctetsDecrypted, 2857 MACSEC_RXSC_STATS_ATTR_PAD) || 2858 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, 2859 sum->InPktsUnchecked, 2860 MACSEC_RXSC_STATS_ATTR_PAD) || 2861 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, 2862 sum->InPktsDelayed, 2863 MACSEC_RXSC_STATS_ATTR_PAD) || 2864 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, 2865 sum->InPktsOK, 2866 MACSEC_RXSC_STATS_ATTR_PAD) || 2867 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, 2868 sum->InPktsInvalid, 2869 MACSEC_RXSC_STATS_ATTR_PAD) || 2870 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, 2871 sum->InPktsLate, 2872 MACSEC_RXSC_STATS_ATTR_PAD) || 2873 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, 2874 sum->InPktsNotValid, 2875 MACSEC_RXSC_STATS_ATTR_PAD) || 2876 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, 2877 sum->InPktsNotUsingSA, 2878 MACSEC_RXSC_STATS_ATTR_PAD) || 2879 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, 2880 sum->InPktsUnusedSA, 2881 MACSEC_RXSC_STATS_ATTR_PAD)) 2882 return -EMSGSIZE; 2883 2884 return 0; 2885} 2886 2887static void get_tx_sc_stats(struct net_device *dev, 2888 struct macsec_tx_sc_stats *sum) 2889{ 2890 struct macsec_dev *macsec = macsec_priv(dev); 2891 int cpu; 2892 2893 /* If h/w offloading is available, propagate to the device */ 2894 if (macsec_is_offloaded(macsec)) { 2895 const struct macsec_ops *ops; 2896 struct macsec_context ctx; 2897 2898 ops = macsec_get_ops(macsec, &ctx); 2899 if (ops) { 2900 ctx.stats.tx_sc_stats = sum; 2901 ctx.secy = &macsec_priv(dev)->secy; 2902 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx); 2903 } 2904 return; 2905 } 2906 2907 for_each_possible_cpu(cpu) { 2908 const struct pcpu_tx_sc_stats *stats; 2909 struct macsec_tx_sc_stats tmp; 2910 unsigned int start; 2911 2912 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu); 2913 do { 2914 start = u64_stats_fetch_begin(&stats->syncp); 2915 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2916 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2917 2918 sum->OutPktsProtected += tmp.OutPktsProtected; 2919 sum->OutPktsEncrypted += tmp.OutPktsEncrypted; 2920 sum->OutOctetsProtected += tmp.OutOctetsProtected; 2921 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted; 2922 } 2923} 2924 2925static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum) 2926{ 2927 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, 2928 sum->OutPktsProtected, 2929 MACSEC_TXSC_STATS_ATTR_PAD) || 2930 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, 2931 sum->OutPktsEncrypted, 2932 MACSEC_TXSC_STATS_ATTR_PAD) || 2933 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, 2934 sum->OutOctetsProtected, 2935 MACSEC_TXSC_STATS_ATTR_PAD) || 2936 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, 2937 sum->OutOctetsEncrypted, 2938 MACSEC_TXSC_STATS_ATTR_PAD)) 2939 return -EMSGSIZE; 2940 2941 return 0; 2942} 2943 2944static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum) 2945{ 2946 struct macsec_dev *macsec = macsec_priv(dev); 2947 int cpu; 2948 2949 /* If h/w offloading is available, propagate to the device */ 2950 if (macsec_is_offloaded(macsec)) { 2951 const struct macsec_ops *ops; 2952 struct macsec_context ctx; 2953 2954 ops = macsec_get_ops(macsec, &ctx); 2955 if (ops) { 2956 ctx.stats.dev_stats = sum; 2957 ctx.secy = &macsec_priv(dev)->secy; 2958 macsec_offload(ops->mdo_get_dev_stats, &ctx); 2959 } 2960 return; 2961 } 2962 2963 for_each_possible_cpu(cpu) { 2964 const struct pcpu_secy_stats *stats; 2965 struct macsec_dev_stats tmp; 2966 unsigned int start; 2967 2968 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu); 2969 do { 2970 start = u64_stats_fetch_begin(&stats->syncp); 2971 memcpy(&tmp, &stats->stats, sizeof(tmp)); 2972 } while (u64_stats_fetch_retry(&stats->syncp, start)); 2973 2974 sum->OutPktsUntagged += tmp.OutPktsUntagged; 2975 sum->InPktsUntagged += tmp.InPktsUntagged; 2976 sum->OutPktsTooLong += tmp.OutPktsTooLong; 2977 sum->InPktsNoTag += tmp.InPktsNoTag; 2978 sum->InPktsBadTag += tmp.InPktsBadTag; 2979 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI; 2980 sum->InPktsNoSCI += tmp.InPktsNoSCI; 2981 sum->InPktsOverrun += tmp.InPktsOverrun; 2982 } 2983} 2984 2985static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum) 2986{ 2987 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, 2988 sum->OutPktsUntagged, 2989 MACSEC_SECY_STATS_ATTR_PAD) || 2990 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, 2991 sum->InPktsUntagged, 2992 MACSEC_SECY_STATS_ATTR_PAD) || 2993 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, 2994 sum->OutPktsTooLong, 2995 MACSEC_SECY_STATS_ATTR_PAD) || 2996 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, 2997 sum->InPktsNoTag, 2998 MACSEC_SECY_STATS_ATTR_PAD) || 2999 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, 3000 sum->InPktsBadTag, 3001 MACSEC_SECY_STATS_ATTR_PAD) || 3002 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, 3003 sum->InPktsUnknownSCI, 3004 MACSEC_SECY_STATS_ATTR_PAD) || 3005 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, 3006 sum->InPktsNoSCI, 3007 MACSEC_SECY_STATS_ATTR_PAD) || 3008 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, 3009 sum->InPktsOverrun, 3010 MACSEC_SECY_STATS_ATTR_PAD)) 3011 return -EMSGSIZE; 3012 3013 return 0; 3014} 3015 3016static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) 3017{ 3018 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3019 struct nlattr *secy_nest = nla_nest_start_noflag(skb, 3020 MACSEC_ATTR_SECY); 3021 u64 csid; 3022 3023 if (!secy_nest) 3024 return 1; 3025 3026 switch (secy->key_len) { 3027 case MACSEC_GCM_AES_128_SAK_LEN: 3028 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 3029 break; 3030 case MACSEC_GCM_AES_256_SAK_LEN: 3031 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 3032 break; 3033 default: 3034 goto cancel; 3035 } 3036 3037 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, 3038 MACSEC_SECY_ATTR_PAD) || 3039 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, 3040 csid, MACSEC_SECY_ATTR_PAD) || 3041 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || 3042 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || 3043 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || 3044 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || 3045 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || 3046 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || 3047 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || 3048 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || 3049 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || 3050 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) 3051 goto cancel; 3052 3053 if (secy->replay_protect) { 3054 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) 3055 goto cancel; 3056 } 3057 3058 nla_nest_end(skb, secy_nest); 3059 return 0; 3060 3061cancel: 3062 nla_nest_cancel(skb, secy_nest); 3063 return 1; 3064} 3065 3066static noinline_for_stack int 3067dump_secy(struct macsec_secy *secy, struct net_device *dev, 3068 struct sk_buff *skb, struct netlink_callback *cb) 3069{ 3070 struct macsec_tx_sc_stats tx_sc_stats = {0, }; 3071 struct macsec_tx_sa_stats tx_sa_stats = {0, }; 3072 struct macsec_rx_sc_stats rx_sc_stats = {0, }; 3073 struct macsec_rx_sa_stats rx_sa_stats = {0, }; 3074 struct macsec_dev *macsec = netdev_priv(dev); 3075 struct macsec_dev_stats dev_stats = {0, }; 3076 struct macsec_tx_sc *tx_sc = &secy->tx_sc; 3077 struct nlattr *txsa_list, *rxsc_list; 3078 struct macsec_rx_sc *rx_sc; 3079 struct nlattr *attr; 3080 void *hdr; 3081 int i, j; 3082 3083 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3084 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); 3085 if (!hdr) 3086 return -EMSGSIZE; 3087 3088 genl_dump_check_consistent(cb, hdr); 3089 3090 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) 3091 goto nla_put_failure; 3092 3093 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD); 3094 if (!attr) 3095 goto nla_put_failure; 3096 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload)) 3097 goto nla_put_failure; 3098 nla_nest_end(skb, attr); 3099 3100 if (nla_put_secy(secy, skb)) 3101 goto nla_put_failure; 3102 3103 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS); 3104 if (!attr) 3105 goto nla_put_failure; 3106 3107 get_tx_sc_stats(dev, &tx_sc_stats); 3108 if (copy_tx_sc_stats(skb, &tx_sc_stats)) { 3109 nla_nest_cancel(skb, attr); 3110 goto nla_put_failure; 3111 } 3112 nla_nest_end(skb, attr); 3113 3114 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS); 3115 if (!attr) 3116 goto nla_put_failure; 3117 get_secy_stats(dev, &dev_stats); 3118 if (copy_secy_stats(skb, &dev_stats)) { 3119 nla_nest_cancel(skb, attr); 3120 goto nla_put_failure; 3121 } 3122 nla_nest_end(skb, attr); 3123 3124 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST); 3125 if (!txsa_list) 3126 goto nla_put_failure; 3127 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { 3128 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); 3129 struct nlattr *txsa_nest; 3130 u64 pn; 3131 int pn_len; 3132 3133 if (!tx_sa) 3134 continue; 3135 3136 txsa_nest = nla_nest_start_noflag(skb, j++); 3137 if (!txsa_nest) { 3138 nla_nest_cancel(skb, txsa_list); 3139 goto nla_put_failure; 3140 } 3141 3142 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS); 3143 if (!attr) { 3144 nla_nest_cancel(skb, txsa_nest); 3145 nla_nest_cancel(skb, txsa_list); 3146 goto nla_put_failure; 3147 } 3148 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats)); 3149 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats); 3150 if (copy_tx_sa_stats(skb, &tx_sa_stats)) { 3151 nla_nest_cancel(skb, attr); 3152 nla_nest_cancel(skb, txsa_nest); 3153 nla_nest_cancel(skb, txsa_list); 3154 goto nla_put_failure; 3155 } 3156 nla_nest_end(skb, attr); 3157 3158 if (secy->xpn) { 3159 pn = tx_sa->next_pn; 3160 pn_len = MACSEC_XPN_PN_LEN; 3161 } else { 3162 pn = tx_sa->next_pn_halves.lower; 3163 pn_len = MACSEC_DEFAULT_PN_LEN; 3164 } 3165 3166 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3167 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3168 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || 3169 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) || 3170 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { 3171 nla_nest_cancel(skb, txsa_nest); 3172 nla_nest_cancel(skb, txsa_list); 3173 goto nla_put_failure; 3174 } 3175 3176 nla_nest_end(skb, txsa_nest); 3177 } 3178 nla_nest_end(skb, txsa_list); 3179 3180 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST); 3181 if (!rxsc_list) 3182 goto nla_put_failure; 3183 3184 j = 1; 3185 for_each_rxsc_rtnl(secy, rx_sc) { 3186 int k; 3187 struct nlattr *rxsa_list; 3188 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++); 3189 3190 if (!rxsc_nest) { 3191 nla_nest_cancel(skb, rxsc_list); 3192 goto nla_put_failure; 3193 } 3194 3195 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || 3196 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, 3197 MACSEC_RXSC_ATTR_PAD)) { 3198 nla_nest_cancel(skb, rxsc_nest); 3199 nla_nest_cancel(skb, rxsc_list); 3200 goto nla_put_failure; 3201 } 3202 3203 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS); 3204 if (!attr) { 3205 nla_nest_cancel(skb, rxsc_nest); 3206 nla_nest_cancel(skb, rxsc_list); 3207 goto nla_put_failure; 3208 } 3209 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats)); 3210 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats); 3211 if (copy_rx_sc_stats(skb, &rx_sc_stats)) { 3212 nla_nest_cancel(skb, attr); 3213 nla_nest_cancel(skb, rxsc_nest); 3214 nla_nest_cancel(skb, rxsc_list); 3215 goto nla_put_failure; 3216 } 3217 nla_nest_end(skb, attr); 3218 3219 rxsa_list = nla_nest_start_noflag(skb, 3220 MACSEC_RXSC_ATTR_SA_LIST); 3221 if (!rxsa_list) { 3222 nla_nest_cancel(skb, rxsc_nest); 3223 nla_nest_cancel(skb, rxsc_list); 3224 goto nla_put_failure; 3225 } 3226 3227 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { 3228 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); 3229 struct nlattr *rxsa_nest; 3230 u64 pn; 3231 int pn_len; 3232 3233 if (!rx_sa) 3234 continue; 3235 3236 rxsa_nest = nla_nest_start_noflag(skb, k++); 3237 if (!rxsa_nest) { 3238 nla_nest_cancel(skb, rxsa_list); 3239 nla_nest_cancel(skb, rxsc_nest); 3240 nla_nest_cancel(skb, rxsc_list); 3241 goto nla_put_failure; 3242 } 3243 3244 attr = nla_nest_start_noflag(skb, 3245 MACSEC_SA_ATTR_STATS); 3246 if (!attr) { 3247 nla_nest_cancel(skb, rxsa_list); 3248 nla_nest_cancel(skb, rxsc_nest); 3249 nla_nest_cancel(skb, rxsc_list); 3250 goto nla_put_failure; 3251 } 3252 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats)); 3253 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats); 3254 if (copy_rx_sa_stats(skb, &rx_sa_stats)) { 3255 nla_nest_cancel(skb, attr); 3256 nla_nest_cancel(skb, rxsa_list); 3257 nla_nest_cancel(skb, rxsc_nest); 3258 nla_nest_cancel(skb, rxsc_list); 3259 goto nla_put_failure; 3260 } 3261 nla_nest_end(skb, attr); 3262 3263 if (secy->xpn) { 3264 pn = rx_sa->next_pn; 3265 pn_len = MACSEC_XPN_PN_LEN; 3266 } else { 3267 pn = rx_sa->next_pn_halves.lower; 3268 pn_len = MACSEC_DEFAULT_PN_LEN; 3269 } 3270 3271 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || 3272 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || 3273 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || 3274 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) || 3275 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { 3276 nla_nest_cancel(skb, rxsa_nest); 3277 nla_nest_cancel(skb, rxsc_nest); 3278 nla_nest_cancel(skb, rxsc_list); 3279 goto nla_put_failure; 3280 } 3281 nla_nest_end(skb, rxsa_nest); 3282 } 3283 3284 nla_nest_end(skb, rxsa_list); 3285 nla_nest_end(skb, rxsc_nest); 3286 } 3287 3288 nla_nest_end(skb, rxsc_list); 3289 3290 genlmsg_end(skb, hdr); 3291 3292 return 0; 3293 3294nla_put_failure: 3295 genlmsg_cancel(skb, hdr); 3296 return -EMSGSIZE; 3297} 3298 3299static int macsec_generation = 1; /* protected by RTNL */ 3300 3301static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) 3302{ 3303 struct net *net = sock_net(skb->sk); 3304 struct net_device *dev; 3305 int dev_idx, d; 3306 3307 dev_idx = cb->args[0]; 3308 3309 d = 0; 3310 rtnl_lock(); 3311 3312 cb->seq = macsec_generation; 3313 3314 for_each_netdev(net, dev) { 3315 struct macsec_secy *secy; 3316 3317 if (d < dev_idx) 3318 goto next; 3319 3320 if (!netif_is_macsec(dev)) 3321 goto next; 3322 3323 secy = &macsec_priv(dev)->secy; 3324 if (dump_secy(secy, dev, skb, cb) < 0) 3325 goto done; 3326next: 3327 d++; 3328 } 3329 3330done: 3331 rtnl_unlock(); 3332 cb->args[0] = d; 3333 return skb->len; 3334} 3335 3336static const struct genl_small_ops macsec_genl_ops[] = { 3337 { 3338 .cmd = MACSEC_CMD_GET_TXSC, 3339 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3340 .dumpit = macsec_dump_txsc, 3341 }, 3342 { 3343 .cmd = MACSEC_CMD_ADD_RXSC, 3344 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3345 .doit = macsec_add_rxsc, 3346 .flags = GENL_ADMIN_PERM, 3347 }, 3348 { 3349 .cmd = MACSEC_CMD_DEL_RXSC, 3350 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3351 .doit = macsec_del_rxsc, 3352 .flags = GENL_ADMIN_PERM, 3353 }, 3354 { 3355 .cmd = MACSEC_CMD_UPD_RXSC, 3356 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3357 .doit = macsec_upd_rxsc, 3358 .flags = GENL_ADMIN_PERM, 3359 }, 3360 { 3361 .cmd = MACSEC_CMD_ADD_TXSA, 3362 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3363 .doit = macsec_add_txsa, 3364 .flags = GENL_ADMIN_PERM, 3365 }, 3366 { 3367 .cmd = MACSEC_CMD_DEL_TXSA, 3368 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3369 .doit = macsec_del_txsa, 3370 .flags = GENL_ADMIN_PERM, 3371 }, 3372 { 3373 .cmd = MACSEC_CMD_UPD_TXSA, 3374 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3375 .doit = macsec_upd_txsa, 3376 .flags = GENL_ADMIN_PERM, 3377 }, 3378 { 3379 .cmd = MACSEC_CMD_ADD_RXSA, 3380 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3381 .doit = macsec_add_rxsa, 3382 .flags = GENL_ADMIN_PERM, 3383 }, 3384 { 3385 .cmd = MACSEC_CMD_DEL_RXSA, 3386 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3387 .doit = macsec_del_rxsa, 3388 .flags = GENL_ADMIN_PERM, 3389 }, 3390 { 3391 .cmd = MACSEC_CMD_UPD_RXSA, 3392 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3393 .doit = macsec_upd_rxsa, 3394 .flags = GENL_ADMIN_PERM, 3395 }, 3396 { 3397 .cmd = MACSEC_CMD_UPD_OFFLOAD, 3398 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 3399 .doit = macsec_upd_offload, 3400 .flags = GENL_ADMIN_PERM, 3401 }, 3402}; 3403 3404static struct genl_family macsec_fam __ro_after_init = { 3405 .name = MACSEC_GENL_NAME, 3406 .hdrsize = 0, 3407 .version = MACSEC_GENL_VERSION, 3408 .maxattr = MACSEC_ATTR_MAX, 3409 .policy = macsec_genl_policy, 3410 .netnsok = true, 3411 .module = THIS_MODULE, 3412 .small_ops = macsec_genl_ops, 3413 .n_small_ops = ARRAY_SIZE(macsec_genl_ops), 3414 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1, 3415}; 3416 3417static struct sk_buff *macsec_insert_tx_tag(struct sk_buff *skb, 3418 struct net_device *dev) 3419{ 3420 struct macsec_dev *macsec = macsec_priv(dev); 3421 const struct macsec_ops *ops; 3422 struct phy_device *phydev; 3423 struct macsec_context ctx; 3424 int skb_final_len; 3425 int err; 3426 3427 ops = macsec_get_ops(macsec, &ctx); 3428 skb_final_len = skb->len - ETH_HLEN + ops->needed_headroom + 3429 ops->needed_tailroom; 3430 if (unlikely(skb_final_len > macsec->real_dev->mtu)) { 3431 err = -EINVAL; 3432 goto cleanup; 3433 } 3434 3435 phydev = macsec->real_dev->phydev; 3436 3437 err = skb_ensure_writable_head_tail(skb, dev); 3438 if (unlikely(err < 0)) 3439 goto cleanup; 3440 3441 err = ops->mdo_insert_tx_tag(phydev, skb); 3442 if (unlikely(err)) 3443 goto cleanup; 3444 3445 return skb; 3446cleanup: 3447 kfree_skb(skb); 3448 return ERR_PTR(err); 3449} 3450 3451static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, 3452 struct net_device *dev) 3453{ 3454 struct macsec_dev *macsec = netdev_priv(dev); 3455 struct macsec_secy *secy = &macsec->secy; 3456 struct pcpu_secy_stats *secy_stats; 3457 int ret, len; 3458 3459 if (macsec_is_offloaded(netdev_priv(dev))) { 3460 struct metadata_dst *md_dst = secy->tx_sc.md_dst; 3461 3462 skb_dst_drop(skb); 3463 dst_hold(&md_dst->dst); 3464 skb_dst_set(skb, &md_dst->dst); 3465 3466 if (macsec->insert_tx_tag) { 3467 skb = macsec_insert_tx_tag(skb, dev); 3468 if (IS_ERR(skb)) { 3469 DEV_STATS_INC(dev, tx_dropped); 3470 return NETDEV_TX_OK; 3471 } 3472 } 3473 3474 skb->dev = macsec->real_dev; 3475 return dev_queue_xmit(skb); 3476 } 3477 3478 /* 10.5 */ 3479 if (!secy->protect_frames) { 3480 secy_stats = this_cpu_ptr(macsec->stats); 3481 u64_stats_update_begin(&secy_stats->syncp); 3482 secy_stats->stats.OutPktsUntagged++; 3483 u64_stats_update_end(&secy_stats->syncp); 3484 skb->dev = macsec->real_dev; 3485 len = skb->len; 3486 ret = dev_queue_xmit(skb); 3487 count_tx(dev, ret, len); 3488 return ret; 3489 } 3490 3491 if (!secy->operational) { 3492 kfree_skb(skb); 3493 DEV_STATS_INC(dev, tx_dropped); 3494 return NETDEV_TX_OK; 3495 } 3496 3497 len = skb->len; 3498 skb = macsec_encrypt(skb, dev); 3499 if (IS_ERR(skb)) { 3500 if (PTR_ERR(skb) != -EINPROGRESS) 3501 DEV_STATS_INC(dev, tx_dropped); 3502 return NETDEV_TX_OK; 3503 } 3504 3505 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); 3506 3507 macsec_encrypt_finish(skb, dev); 3508 ret = dev_queue_xmit(skb); 3509 count_tx(dev, ret, len); 3510 return ret; 3511} 3512 3513#define MACSEC_FEATURES \ 3514 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) 3515 3516static int macsec_dev_init(struct net_device *dev) 3517{ 3518 struct macsec_dev *macsec = macsec_priv(dev); 3519 struct net_device *real_dev = macsec->real_dev; 3520 int err; 3521 3522 err = gro_cells_init(&macsec->gro_cells, dev); 3523 if (err) 3524 return err; 3525 3526 dev->features = real_dev->features & MACSEC_FEATURES; 3527 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; 3528 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 3529 3530 macsec_set_head_tail_room(dev); 3531 3532 if (is_zero_ether_addr(dev->dev_addr)) 3533 eth_hw_addr_inherit(dev, real_dev); 3534 if (is_zero_ether_addr(dev->broadcast)) 3535 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 3536 3537 /* Get macsec's reference to real_dev */ 3538 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL); 3539 3540 return 0; 3541} 3542 3543static void macsec_dev_uninit(struct net_device *dev) 3544{ 3545 struct macsec_dev *macsec = macsec_priv(dev); 3546 3547 gro_cells_destroy(&macsec->gro_cells); 3548} 3549 3550static netdev_features_t macsec_fix_features(struct net_device *dev, 3551 netdev_features_t features) 3552{ 3553 struct macsec_dev *macsec = macsec_priv(dev); 3554 struct net_device *real_dev = macsec->real_dev; 3555 3556 features &= (real_dev->features & MACSEC_FEATURES) | 3557 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; 3558 features |= NETIF_F_LLTX; 3559 3560 return features; 3561} 3562 3563static int macsec_dev_open(struct net_device *dev) 3564{ 3565 struct macsec_dev *macsec = macsec_priv(dev); 3566 struct net_device *real_dev = macsec->real_dev; 3567 int err; 3568 3569 err = dev_uc_add(real_dev, dev->dev_addr); 3570 if (err < 0) 3571 return err; 3572 3573 if (dev->flags & IFF_ALLMULTI) { 3574 err = dev_set_allmulti(real_dev, 1); 3575 if (err < 0) 3576 goto del_unicast; 3577 } 3578 3579 if (dev->flags & IFF_PROMISC) { 3580 err = dev_set_promiscuity(real_dev, 1); 3581 if (err < 0) 3582 goto clear_allmulti; 3583 } 3584 3585 /* If h/w offloading is available, propagate to the device */ 3586 if (macsec_is_offloaded(macsec)) { 3587 const struct macsec_ops *ops; 3588 struct macsec_context ctx; 3589 3590 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3591 if (!ops) { 3592 err = -EOPNOTSUPP; 3593 goto clear_allmulti; 3594 } 3595 3596 ctx.secy = &macsec->secy; 3597 err = macsec_offload(ops->mdo_dev_open, &ctx); 3598 if (err) 3599 goto clear_allmulti; 3600 } 3601 3602 if (netif_carrier_ok(real_dev)) 3603 netif_carrier_on(dev); 3604 3605 return 0; 3606clear_allmulti: 3607 if (dev->flags & IFF_ALLMULTI) 3608 dev_set_allmulti(real_dev, -1); 3609del_unicast: 3610 dev_uc_del(real_dev, dev->dev_addr); 3611 netif_carrier_off(dev); 3612 return err; 3613} 3614 3615static int macsec_dev_stop(struct net_device *dev) 3616{ 3617 struct macsec_dev *macsec = macsec_priv(dev); 3618 struct net_device *real_dev = macsec->real_dev; 3619 3620 netif_carrier_off(dev); 3621 3622 /* If h/w offloading is available, propagate to the device */ 3623 if (macsec_is_offloaded(macsec)) { 3624 const struct macsec_ops *ops; 3625 struct macsec_context ctx; 3626 3627 ops = macsec_get_ops(macsec, &ctx); 3628 if (ops) { 3629 ctx.secy = &macsec->secy; 3630 macsec_offload(ops->mdo_dev_stop, &ctx); 3631 } 3632 } 3633 3634 dev_mc_unsync(real_dev, dev); 3635 dev_uc_unsync(real_dev, dev); 3636 3637 if (dev->flags & IFF_ALLMULTI) 3638 dev_set_allmulti(real_dev, -1); 3639 3640 if (dev->flags & IFF_PROMISC) 3641 dev_set_promiscuity(real_dev, -1); 3642 3643 dev_uc_del(real_dev, dev->dev_addr); 3644 3645 return 0; 3646} 3647 3648static void macsec_dev_change_rx_flags(struct net_device *dev, int change) 3649{ 3650 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3651 3652 if (!(dev->flags & IFF_UP)) 3653 return; 3654 3655 if (change & IFF_ALLMULTI) 3656 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 3657 3658 if (change & IFF_PROMISC) 3659 dev_set_promiscuity(real_dev, 3660 dev->flags & IFF_PROMISC ? 1 : -1); 3661} 3662 3663static void macsec_dev_set_rx_mode(struct net_device *dev) 3664{ 3665 struct net_device *real_dev = macsec_priv(dev)->real_dev; 3666 3667 dev_mc_sync(real_dev, dev); 3668 dev_uc_sync(real_dev, dev); 3669} 3670 3671static int macsec_set_mac_address(struct net_device *dev, void *p) 3672{ 3673 struct macsec_dev *macsec = macsec_priv(dev); 3674 struct net_device *real_dev = macsec->real_dev; 3675 struct sockaddr *addr = p; 3676 u8 old_addr[ETH_ALEN]; 3677 int err; 3678 3679 if (!is_valid_ether_addr(addr->sa_data)) 3680 return -EADDRNOTAVAIL; 3681 3682 if (dev->flags & IFF_UP) { 3683 err = dev_uc_add(real_dev, addr->sa_data); 3684 if (err < 0) 3685 return err; 3686 } 3687 3688 ether_addr_copy(old_addr, dev->dev_addr); 3689 eth_hw_addr_set(dev, addr->sa_data); 3690 3691 /* If h/w offloading is available, propagate to the device */ 3692 if (macsec_is_offloaded(macsec)) { 3693 const struct macsec_ops *ops; 3694 struct macsec_context ctx; 3695 3696 ops = macsec_get_ops(macsec, &ctx); 3697 if (!ops) { 3698 err = -EOPNOTSUPP; 3699 goto restore_old_addr; 3700 } 3701 3702 ctx.secy = &macsec->secy; 3703 err = macsec_offload(ops->mdo_upd_secy, &ctx); 3704 if (err) 3705 goto restore_old_addr; 3706 } 3707 3708 if (dev->flags & IFF_UP) 3709 dev_uc_del(real_dev, old_addr); 3710 3711 return 0; 3712 3713restore_old_addr: 3714 if (dev->flags & IFF_UP) 3715 dev_uc_del(real_dev, addr->sa_data); 3716 3717 eth_hw_addr_set(dev, old_addr); 3718 3719 return err; 3720} 3721 3722static int macsec_change_mtu(struct net_device *dev, int new_mtu) 3723{ 3724 struct macsec_dev *macsec = macsec_priv(dev); 3725 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); 3726 3727 if (macsec->real_dev->mtu - extra < new_mtu) 3728 return -ERANGE; 3729 3730 dev->mtu = new_mtu; 3731 3732 return 0; 3733} 3734 3735static void macsec_get_stats64(struct net_device *dev, 3736 struct rtnl_link_stats64 *s) 3737{ 3738 if (!dev->tstats) 3739 return; 3740 3741 dev_fetch_sw_netstats(s, dev->tstats); 3742 3743 s->rx_dropped = DEV_STATS_READ(dev, rx_dropped); 3744 s->tx_dropped = DEV_STATS_READ(dev, tx_dropped); 3745 s->rx_errors = DEV_STATS_READ(dev, rx_errors); 3746} 3747 3748static int macsec_get_iflink(const struct net_device *dev) 3749{ 3750 return READ_ONCE(macsec_priv(dev)->real_dev->ifindex); 3751} 3752 3753static const struct net_device_ops macsec_netdev_ops = { 3754 .ndo_init = macsec_dev_init, 3755 .ndo_uninit = macsec_dev_uninit, 3756 .ndo_open = macsec_dev_open, 3757 .ndo_stop = macsec_dev_stop, 3758 .ndo_fix_features = macsec_fix_features, 3759 .ndo_change_mtu = macsec_change_mtu, 3760 .ndo_set_rx_mode = macsec_dev_set_rx_mode, 3761 .ndo_change_rx_flags = macsec_dev_change_rx_flags, 3762 .ndo_set_mac_address = macsec_set_mac_address, 3763 .ndo_start_xmit = macsec_start_xmit, 3764 .ndo_get_stats64 = macsec_get_stats64, 3765 .ndo_get_iflink = macsec_get_iflink, 3766}; 3767 3768static const struct device_type macsec_type = { 3769 .name = "macsec", 3770}; 3771 3772static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { 3773 [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, 3774 [IFLA_MACSEC_PORT] = { .type = NLA_U16 }, 3775 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, 3776 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, 3777 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, 3778 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, 3779 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, 3780 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, 3781 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, 3782 [IFLA_MACSEC_ES] = { .type = NLA_U8 }, 3783 [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, 3784 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, 3785 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, 3786 [IFLA_MACSEC_OFFLOAD] = { .type = NLA_U8 }, 3787}; 3788 3789static void macsec_free_netdev(struct net_device *dev) 3790{ 3791 struct macsec_dev *macsec = macsec_priv(dev); 3792 3793 if (macsec->secy.tx_sc.md_dst) 3794 metadata_dst_free(macsec->secy.tx_sc.md_dst); 3795 free_percpu(macsec->stats); 3796 free_percpu(macsec->secy.tx_sc.stats); 3797 3798 /* Get rid of the macsec's reference to real_dev */ 3799 netdev_put(macsec->real_dev, &macsec->dev_tracker); 3800} 3801 3802static void macsec_setup(struct net_device *dev) 3803{ 3804 ether_setup(dev); 3805 dev->min_mtu = 0; 3806 dev->max_mtu = ETH_MAX_MTU; 3807 dev->priv_flags |= IFF_NO_QUEUE; 3808 dev->netdev_ops = &macsec_netdev_ops; 3809 dev->needs_free_netdev = true; 3810 dev->priv_destructor = macsec_free_netdev; 3811 SET_NETDEV_DEVTYPE(dev, &macsec_type); 3812 3813 eth_zero_addr(dev->broadcast); 3814} 3815 3816static int macsec_changelink_common(struct net_device *dev, 3817 struct nlattr *data[]) 3818{ 3819 struct macsec_secy *secy; 3820 struct macsec_tx_sc *tx_sc; 3821 3822 secy = &macsec_priv(dev)->secy; 3823 tx_sc = &secy->tx_sc; 3824 3825 if (data[IFLA_MACSEC_ENCODING_SA]) { 3826 struct macsec_tx_sa *tx_sa; 3827 3828 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); 3829 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); 3830 3831 secy->operational = tx_sa && tx_sa->active; 3832 } 3833 3834 if (data[IFLA_MACSEC_ENCRYPT]) 3835 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); 3836 3837 if (data[IFLA_MACSEC_PROTECT]) 3838 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); 3839 3840 if (data[IFLA_MACSEC_INC_SCI]) 3841 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 3842 3843 if (data[IFLA_MACSEC_ES]) 3844 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); 3845 3846 if (data[IFLA_MACSEC_SCB]) 3847 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); 3848 3849 if (data[IFLA_MACSEC_REPLAY_PROTECT]) 3850 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); 3851 3852 if (data[IFLA_MACSEC_VALIDATION]) 3853 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); 3854 3855 if (data[IFLA_MACSEC_CIPHER_SUITE]) { 3856 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) { 3857 case MACSEC_CIPHER_ID_GCM_AES_128: 3858 case MACSEC_DEFAULT_CIPHER_ID: 3859 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3860 secy->xpn = false; 3861 break; 3862 case MACSEC_CIPHER_ID_GCM_AES_256: 3863 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3864 secy->xpn = false; 3865 break; 3866 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 3867 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN; 3868 secy->xpn = true; 3869 break; 3870 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 3871 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN; 3872 secy->xpn = true; 3873 break; 3874 default: 3875 return -EINVAL; 3876 } 3877 } 3878 3879 if (data[IFLA_MACSEC_WINDOW]) { 3880 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); 3881 3882 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window 3883 * for XPN cipher suites */ 3884 if (secy->xpn && 3885 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW) 3886 return -EINVAL; 3887 } 3888 3889 return 0; 3890} 3891 3892static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], 3893 struct nlattr *data[], 3894 struct netlink_ext_ack *extack) 3895{ 3896 struct macsec_dev *macsec = macsec_priv(dev); 3897 bool macsec_offload_state_change = false; 3898 enum macsec_offload offload; 3899 struct macsec_tx_sc tx_sc; 3900 struct macsec_secy secy; 3901 int ret; 3902 3903 if (!data) 3904 return 0; 3905 3906 if (data[IFLA_MACSEC_CIPHER_SUITE] || 3907 data[IFLA_MACSEC_ICV_LEN] || 3908 data[IFLA_MACSEC_SCI] || 3909 data[IFLA_MACSEC_PORT]) 3910 return -EINVAL; 3911 3912 /* Keep a copy of unmodified secy and tx_sc, in case the offload 3913 * propagation fails, to revert macsec_changelink_common. 3914 */ 3915 memcpy(&secy, &macsec->secy, sizeof(secy)); 3916 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc)); 3917 3918 ret = macsec_changelink_common(dev, data); 3919 if (ret) 3920 goto cleanup; 3921 3922 if (data[IFLA_MACSEC_OFFLOAD]) { 3923 offload = nla_get_u8(data[IFLA_MACSEC_OFFLOAD]); 3924 if (macsec->offload != offload) { 3925 macsec_offload_state_change = true; 3926 ret = macsec_update_offload(dev, offload); 3927 if (ret) 3928 goto cleanup; 3929 } 3930 } 3931 3932 /* If h/w offloading is available, propagate to the device */ 3933 if (!macsec_offload_state_change && macsec_is_offloaded(macsec)) { 3934 const struct macsec_ops *ops; 3935 struct macsec_context ctx; 3936 3937 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3938 if (!ops) { 3939 ret = -EOPNOTSUPP; 3940 goto cleanup; 3941 } 3942 3943 ctx.secy = &macsec->secy; 3944 ret = macsec_offload(ops->mdo_upd_secy, &ctx); 3945 if (ret) 3946 goto cleanup; 3947 } 3948 3949 return 0; 3950 3951cleanup: 3952 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc)); 3953 memcpy(&macsec->secy, &secy, sizeof(secy)); 3954 3955 return ret; 3956} 3957 3958static void macsec_del_dev(struct macsec_dev *macsec) 3959{ 3960 int i; 3961 3962 while (macsec->secy.rx_sc) { 3963 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); 3964 3965 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); 3966 free_rx_sc(rx_sc); 3967 } 3968 3969 for (i = 0; i < MACSEC_NUM_AN; i++) { 3970 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); 3971 3972 if (sa) { 3973 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); 3974 clear_tx_sa(sa); 3975 } 3976 } 3977} 3978 3979static void macsec_common_dellink(struct net_device *dev, struct list_head *head) 3980{ 3981 struct macsec_dev *macsec = macsec_priv(dev); 3982 struct net_device *real_dev = macsec->real_dev; 3983 3984 /* If h/w offloading is available, propagate to the device */ 3985 if (macsec_is_offloaded(macsec)) { 3986 const struct macsec_ops *ops; 3987 struct macsec_context ctx; 3988 3989 ops = macsec_get_ops(netdev_priv(dev), &ctx); 3990 if (ops) { 3991 ctx.secy = &macsec->secy; 3992 macsec_offload(ops->mdo_del_secy, &ctx); 3993 } 3994 } 3995 3996 unregister_netdevice_queue(dev, head); 3997 list_del_rcu(&macsec->secys); 3998 macsec_del_dev(macsec); 3999 netdev_upper_dev_unlink(real_dev, dev); 4000 4001 macsec_generation++; 4002} 4003 4004static void macsec_dellink(struct net_device *dev, struct list_head *head) 4005{ 4006 struct macsec_dev *macsec = macsec_priv(dev); 4007 struct net_device *real_dev = macsec->real_dev; 4008 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 4009 4010 macsec_common_dellink(dev, head); 4011 4012 if (list_empty(&rxd->secys)) { 4013 netdev_rx_handler_unregister(real_dev); 4014 kfree(rxd); 4015 } 4016} 4017 4018static int register_macsec_dev(struct net_device *real_dev, 4019 struct net_device *dev) 4020{ 4021 struct macsec_dev *macsec = macsec_priv(dev); 4022 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); 4023 4024 if (!rxd) { 4025 int err; 4026 4027 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); 4028 if (!rxd) 4029 return -ENOMEM; 4030 4031 INIT_LIST_HEAD(&rxd->secys); 4032 4033 err = netdev_rx_handler_register(real_dev, macsec_handle_frame, 4034 rxd); 4035 if (err < 0) { 4036 kfree(rxd); 4037 return err; 4038 } 4039 } 4040 4041 list_add_tail_rcu(&macsec->secys, &rxd->secys); 4042 return 0; 4043} 4044 4045static bool sci_exists(struct net_device *dev, sci_t sci) 4046{ 4047 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); 4048 struct macsec_dev *macsec; 4049 4050 list_for_each_entry(macsec, &rxd->secys, secys) { 4051 if (macsec->secy.sci == sci) 4052 return true; 4053 } 4054 4055 return false; 4056} 4057 4058static sci_t dev_to_sci(struct net_device *dev, __be16 port) 4059{ 4060 return make_sci(dev->dev_addr, port); 4061} 4062 4063static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) 4064{ 4065 struct macsec_dev *macsec = macsec_priv(dev); 4066 struct macsec_secy *secy = &macsec->secy; 4067 4068 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); 4069 if (!macsec->stats) 4070 return -ENOMEM; 4071 4072 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); 4073 if (!secy->tx_sc.stats) 4074 return -ENOMEM; 4075 4076 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL); 4077 if (!secy->tx_sc.md_dst) 4078 /* macsec and secy percpu stats will be freed when unregistering 4079 * net_device in macsec_free_netdev() 4080 */ 4081 return -ENOMEM; 4082 4083 if (sci == MACSEC_UNDEF_SCI) 4084 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4085 4086 secy->netdev = dev; 4087 secy->operational = true; 4088 secy->key_len = DEFAULT_SAK_LEN; 4089 secy->icv_len = icv_len; 4090 secy->validate_frames = MACSEC_VALIDATE_DEFAULT; 4091 secy->protect_frames = true; 4092 secy->replay_protect = false; 4093 secy->xpn = DEFAULT_XPN; 4094 4095 secy->sci = sci; 4096 secy->tx_sc.md_dst->u.macsec_info.sci = sci; 4097 secy->tx_sc.active = true; 4098 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; 4099 secy->tx_sc.encrypt = DEFAULT_ENCRYPT; 4100 secy->tx_sc.send_sci = DEFAULT_SEND_SCI; 4101 secy->tx_sc.end_station = false; 4102 secy->tx_sc.scb = false; 4103 4104 return 0; 4105} 4106 4107static struct lock_class_key macsec_netdev_addr_lock_key; 4108 4109static int macsec_newlink(struct net *net, struct net_device *dev, 4110 struct nlattr *tb[], struct nlattr *data[], 4111 struct netlink_ext_ack *extack) 4112{ 4113 struct macsec_dev *macsec = macsec_priv(dev); 4114 rx_handler_func_t *rx_handler; 4115 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4116 struct net_device *real_dev; 4117 int err, mtu; 4118 sci_t sci; 4119 4120 if (!tb[IFLA_LINK]) 4121 return -EINVAL; 4122 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); 4123 if (!real_dev) 4124 return -ENODEV; 4125 if (real_dev->type != ARPHRD_ETHER) 4126 return -EINVAL; 4127 4128 dev->priv_flags |= IFF_MACSEC; 4129 4130 macsec->real_dev = real_dev; 4131 4132 if (data && data[IFLA_MACSEC_OFFLOAD]) 4133 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]); 4134 else 4135 /* MACsec offloading is off by default */ 4136 macsec->offload = MACSEC_OFFLOAD_OFF; 4137 4138 /* Check if the offloading mode is supported by the underlying layers */ 4139 if (macsec->offload != MACSEC_OFFLOAD_OFF && 4140 !macsec_check_offload(macsec->offload, macsec)) 4141 return -EOPNOTSUPP; 4142 4143 /* send_sci must be set to true when transmit sci explicitly is set */ 4144 if ((data && data[IFLA_MACSEC_SCI]) && 4145 (data && data[IFLA_MACSEC_INC_SCI])) { 4146 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); 4147 4148 if (!send_sci) 4149 return -EINVAL; 4150 } 4151 4152 if (data && data[IFLA_MACSEC_ICV_LEN]) 4153 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4154 mtu = real_dev->mtu - icv_len - macsec_extra_len(true); 4155 if (mtu < 0) 4156 dev->mtu = 0; 4157 else 4158 dev->mtu = mtu; 4159 4160 rx_handler = rtnl_dereference(real_dev->rx_handler); 4161 if (rx_handler && rx_handler != macsec_handle_frame) 4162 return -EBUSY; 4163 4164 err = register_netdevice(dev); 4165 if (err < 0) 4166 return err; 4167 4168 netdev_lockdep_set_classes(dev); 4169 lockdep_set_class(&dev->addr_list_lock, 4170 &macsec_netdev_addr_lock_key); 4171 4172 err = netdev_upper_dev_link(real_dev, dev, extack); 4173 if (err < 0) 4174 goto unregister; 4175 4176 /* need to be already registered so that ->init has run and 4177 * the MAC addr is set 4178 */ 4179 if (data && data[IFLA_MACSEC_SCI]) 4180 sci = nla_get_sci(data[IFLA_MACSEC_SCI]); 4181 else if (data && data[IFLA_MACSEC_PORT]) 4182 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); 4183 else 4184 sci = dev_to_sci(dev, MACSEC_PORT_ES); 4185 4186 if (rx_handler && sci_exists(real_dev, sci)) { 4187 err = -EBUSY; 4188 goto unlink; 4189 } 4190 4191 err = macsec_add_dev(dev, sci, icv_len); 4192 if (err) 4193 goto unlink; 4194 4195 if (data) { 4196 err = macsec_changelink_common(dev, data); 4197 if (err) 4198 goto del_dev; 4199 } 4200 4201 /* If h/w offloading is available, propagate to the device */ 4202 if (macsec_is_offloaded(macsec)) { 4203 const struct macsec_ops *ops; 4204 struct macsec_context ctx; 4205 4206 ops = macsec_get_ops(macsec, &ctx); 4207 if (ops) { 4208 ctx.secy = &macsec->secy; 4209 err = macsec_offload(ops->mdo_add_secy, &ctx); 4210 if (err) 4211 goto del_dev; 4212 4213 macsec->insert_tx_tag = 4214 macsec_needs_tx_tag(macsec, ops); 4215 } 4216 } 4217 4218 err = register_macsec_dev(real_dev, dev); 4219 if (err < 0) 4220 goto del_dev; 4221 4222 netif_stacked_transfer_operstate(real_dev, dev); 4223 linkwatch_fire_event(dev); 4224 4225 macsec_generation++; 4226 4227 return 0; 4228 4229del_dev: 4230 macsec_del_dev(macsec); 4231unlink: 4232 netdev_upper_dev_unlink(real_dev, dev); 4233unregister: 4234 unregister_netdevice(dev); 4235 return err; 4236} 4237 4238static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], 4239 struct netlink_ext_ack *extack) 4240{ 4241 u64 csid = MACSEC_DEFAULT_CIPHER_ID; 4242 u8 icv_len = MACSEC_DEFAULT_ICV_LEN; 4243 int flag; 4244 bool es, scb, sci; 4245 4246 if (!data) 4247 return 0; 4248 4249 if (data[IFLA_MACSEC_CIPHER_SUITE]) 4250 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); 4251 4252 if (data[IFLA_MACSEC_ICV_LEN]) { 4253 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); 4254 if (icv_len != MACSEC_DEFAULT_ICV_LEN) { 4255 char dummy_key[DEFAULT_SAK_LEN] = { 0 }; 4256 struct crypto_aead *dummy_tfm; 4257 4258 dummy_tfm = macsec_alloc_tfm(dummy_key, 4259 DEFAULT_SAK_LEN, 4260 icv_len); 4261 if (IS_ERR(dummy_tfm)) 4262 return PTR_ERR(dummy_tfm); 4263 crypto_free_aead(dummy_tfm); 4264 } 4265 } 4266 4267 switch (csid) { 4268 case MACSEC_CIPHER_ID_GCM_AES_128: 4269 case MACSEC_CIPHER_ID_GCM_AES_256: 4270 case MACSEC_CIPHER_ID_GCM_AES_XPN_128: 4271 case MACSEC_CIPHER_ID_GCM_AES_XPN_256: 4272 case MACSEC_DEFAULT_CIPHER_ID: 4273 if (icv_len < MACSEC_MIN_ICV_LEN || 4274 icv_len > MACSEC_STD_ICV_LEN) 4275 return -EINVAL; 4276 break; 4277 default: 4278 return -EINVAL; 4279 } 4280 4281 if (data[IFLA_MACSEC_ENCODING_SA]) { 4282 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) 4283 return -EINVAL; 4284 } 4285 4286 for (flag = IFLA_MACSEC_ENCODING_SA + 1; 4287 flag < IFLA_MACSEC_VALIDATION; 4288 flag++) { 4289 if (data[flag]) { 4290 if (nla_get_u8(data[flag]) > 1) 4291 return -EINVAL; 4292 } 4293 } 4294 4295 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; 4296 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; 4297 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; 4298 4299 if ((sci && (scb || es)) || (scb && es)) 4300 return -EINVAL; 4301 4302 if (data[IFLA_MACSEC_VALIDATION] && 4303 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) 4304 return -EINVAL; 4305 4306 if ((data[IFLA_MACSEC_REPLAY_PROTECT] && 4307 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && 4308 !data[IFLA_MACSEC_WINDOW]) 4309 return -EINVAL; 4310 4311 return 0; 4312} 4313 4314static struct net *macsec_get_link_net(const struct net_device *dev) 4315{ 4316 return dev_net(macsec_priv(dev)->real_dev); 4317} 4318 4319struct net_device *macsec_get_real_dev(const struct net_device *dev) 4320{ 4321 return macsec_priv(dev)->real_dev; 4322} 4323EXPORT_SYMBOL_GPL(macsec_get_real_dev); 4324 4325bool macsec_netdev_is_offloaded(struct net_device *dev) 4326{ 4327 return macsec_is_offloaded(macsec_priv(dev)); 4328} 4329EXPORT_SYMBOL_GPL(macsec_netdev_is_offloaded); 4330 4331static size_t macsec_get_size(const struct net_device *dev) 4332{ 4333 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ 4334 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ 4335 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ 4336 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ 4337 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ 4338 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ 4339 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ 4340 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ 4341 nla_total_size(1) + /* IFLA_MACSEC_ES */ 4342 nla_total_size(1) + /* IFLA_MACSEC_SCB */ 4343 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ 4344 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ 4345 nla_total_size(1) + /* IFLA_MACSEC_OFFLOAD */ 4346 0; 4347} 4348 4349static int macsec_fill_info(struct sk_buff *skb, 4350 const struct net_device *dev) 4351{ 4352 struct macsec_tx_sc *tx_sc; 4353 struct macsec_dev *macsec; 4354 struct macsec_secy *secy; 4355 u64 csid; 4356 4357 macsec = macsec_priv(dev); 4358 secy = &macsec->secy; 4359 tx_sc = &secy->tx_sc; 4360 4361 switch (secy->key_len) { 4362 case MACSEC_GCM_AES_128_SAK_LEN: 4363 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; 4364 break; 4365 case MACSEC_GCM_AES_256_SAK_LEN: 4366 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; 4367 break; 4368 default: 4369 goto nla_put_failure; 4370 } 4371 4372 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, 4373 IFLA_MACSEC_PAD) || 4374 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || 4375 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, 4376 csid, IFLA_MACSEC_PAD) || 4377 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || 4378 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || 4379 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || 4380 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || 4381 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || 4382 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || 4383 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || 4384 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || 4385 nla_put_u8(skb, IFLA_MACSEC_OFFLOAD, macsec->offload) || 4386 0) 4387 goto nla_put_failure; 4388 4389 if (secy->replay_protect) { 4390 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) 4391 goto nla_put_failure; 4392 } 4393 4394 return 0; 4395 4396nla_put_failure: 4397 return -EMSGSIZE; 4398} 4399 4400static struct rtnl_link_ops macsec_link_ops __read_mostly = { 4401 .kind = "macsec", 4402 .priv_size = sizeof(struct macsec_dev), 4403 .maxtype = IFLA_MACSEC_MAX, 4404 .policy = macsec_rtnl_policy, 4405 .setup = macsec_setup, 4406 .validate = macsec_validate_attr, 4407 .newlink = macsec_newlink, 4408 .changelink = macsec_changelink, 4409 .dellink = macsec_dellink, 4410 .get_size = macsec_get_size, 4411 .fill_info = macsec_fill_info, 4412 .get_link_net = macsec_get_link_net, 4413}; 4414 4415static bool is_macsec_master(struct net_device *dev) 4416{ 4417 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; 4418} 4419 4420static int macsec_notify(struct notifier_block *this, unsigned long event, 4421 void *ptr) 4422{ 4423 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); 4424 LIST_HEAD(head); 4425 4426 if (!is_macsec_master(real_dev)) 4427 return NOTIFY_DONE; 4428 4429 switch (event) { 4430 case NETDEV_DOWN: 4431 case NETDEV_UP: 4432 case NETDEV_CHANGE: { 4433 struct macsec_dev *m, *n; 4434 struct macsec_rxh_data *rxd; 4435 4436 rxd = macsec_data_rtnl(real_dev); 4437 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4438 struct net_device *dev = m->secy.netdev; 4439 4440 netif_stacked_transfer_operstate(real_dev, dev); 4441 } 4442 break; 4443 } 4444 case NETDEV_UNREGISTER: { 4445 struct macsec_dev *m, *n; 4446 struct macsec_rxh_data *rxd; 4447 4448 rxd = macsec_data_rtnl(real_dev); 4449 list_for_each_entry_safe(m, n, &rxd->secys, secys) { 4450 macsec_common_dellink(m->secy.netdev, &head); 4451 } 4452 4453 netdev_rx_handler_unregister(real_dev); 4454 kfree(rxd); 4455 4456 unregister_netdevice_many(&head); 4457 break; 4458 } 4459 case NETDEV_CHANGEMTU: { 4460 struct macsec_dev *m; 4461 struct macsec_rxh_data *rxd; 4462 4463 rxd = macsec_data_rtnl(real_dev); 4464 list_for_each_entry(m, &rxd->secys, secys) { 4465 struct net_device *dev = m->secy.netdev; 4466 unsigned int mtu = real_dev->mtu - (m->secy.icv_len + 4467 macsec_extra_len(true)); 4468 4469 if (dev->mtu > mtu) 4470 dev_set_mtu(dev, mtu); 4471 } 4472 } 4473 } 4474 4475 return NOTIFY_OK; 4476} 4477 4478static struct notifier_block macsec_notifier = { 4479 .notifier_call = macsec_notify, 4480}; 4481 4482static int __init macsec_init(void) 4483{ 4484 int err; 4485 4486 pr_info("MACsec IEEE 802.1AE\n"); 4487 err = register_netdevice_notifier(&macsec_notifier); 4488 if (err) 4489 return err; 4490 4491 err = rtnl_link_register(&macsec_link_ops); 4492 if (err) 4493 goto notifier; 4494 4495 err = genl_register_family(&macsec_fam); 4496 if (err) 4497 goto rtnl; 4498 4499 return 0; 4500 4501rtnl: 4502 rtnl_link_unregister(&macsec_link_ops); 4503notifier: 4504 unregister_netdevice_notifier(&macsec_notifier); 4505 return err; 4506} 4507 4508static void __exit macsec_exit(void) 4509{ 4510 genl_unregister_family(&macsec_fam); 4511 rtnl_link_unregister(&macsec_link_ops); 4512 unregister_netdevice_notifier(&macsec_notifier); 4513 rcu_barrier(); 4514} 4515 4516module_init(macsec_init); 4517module_exit(macsec_exit); 4518 4519MODULE_ALIAS_RTNL_LINK("macsec"); 4520MODULE_ALIAS_GENL_FAMILY("macsec"); 4521 4522MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); 4523MODULE_LICENSE("GPL v2"); 4524