1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * xfrm_input.c 4 * 5 * Changes: 6 * YOSHIFUJI Hideaki @USAGI 7 * Split up af-specific portion 8 * 9 */ 10 11 #include <linux/bottom_half.h> 12 #include <linux/cache.h> 13 #include <linux/interrupt.h> 14 #include <linux/slab.h> 15 #include <linux/module.h> 16 #include <linux/netdevice.h> 17 #include <linux/percpu.h> 18 #include <net/dst.h> 19 #include <net/ip.h> 20 #include <net/xfrm.h> 21 #include <net/ip_tunnels.h> 22 #include <net/ip6_tunnel.h> 23 24 #include "xfrm_inout.h" 25 26 struct xfrm_trans_tasklet { 27 struct tasklet_struct tasklet; 28 struct sk_buff_head queue; 29 }; 30 31 struct xfrm_trans_cb { 32 union { 33 struct inet_skb_parm h4; 34 #if IS_ENABLED(CONFIG_IPV6) 35 struct inet6_skb_parm h6; 36 #endif 37 } header; 38 int (*finish)(struct net *net, struct sock *sk, struct sk_buff *skb); 39 struct net *net; 40 }; 41 42 #define XFRM_TRANS_SKB_CB(__skb) ((struct xfrm_trans_cb *)&((__skb)->cb[0])) 43 44 static DEFINE_SPINLOCK(xfrm_input_afinfo_lock); 45 static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[AF_INET6 + 1]; 46 47 static struct gro_cells gro_cells; 48 static struct net_device xfrm_napi_dev; 49 50 static DEFINE_PER_CPU(struct xfrm_trans_tasklet, xfrm_trans_tasklet); 51 52 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo) 53 { 54 int err = 0; 55 56 if (WARN_ON(afinfo->family >= ARRAY_SIZE(xfrm_input_afinfo))) 57 return -EAFNOSUPPORT; 58 59 spin_lock_bh(&xfrm_input_afinfo_lock); 60 if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL)) 61 err = -EEXIST; 62 else 63 rcu_assign_pointer(xfrm_input_afinfo[afinfo->family], afinfo); 64 spin_unlock_bh(&xfrm_input_afinfo_lock); 65 return err; 66 } 67 EXPORT_SYMBOL(xfrm_input_register_afinfo); 68 69 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo) 70 { 71 int err = 0; 72 73 spin_lock_bh(&xfrm_input_afinfo_lock); 74 if (likely(xfrm_input_afinfo[afinfo->family] != NULL)) { 75 if (unlikely(xfrm_input_afinfo[afinfo->family] != afinfo)) 76 err = -EINVAL; 77 else 78 RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->family], NULL); 79 } 80 spin_unlock_bh(&xfrm_input_afinfo_lock); 81 synchronize_rcu(); 82 return err; 83 } 84 EXPORT_SYMBOL(xfrm_input_unregister_afinfo); 85 86 static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family) 87 { 88 const struct xfrm_input_afinfo *afinfo; 89 90 if (WARN_ON_ONCE(family >= ARRAY_SIZE(xfrm_input_afinfo))) 91 return NULL; 92 93 rcu_read_lock(); 94 afinfo = rcu_dereference(xfrm_input_afinfo[family]); 95 if (unlikely(!afinfo)) 96 rcu_read_unlock(); 97 return afinfo; 98 } 99 100 static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol, 101 int err) 102 { 103 int ret; 104 const struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family); 105 106 if (!afinfo) 107 return -EAFNOSUPPORT; 108 109 ret = afinfo->callback(skb, protocol, err); 110 rcu_read_unlock(); 111 112 return ret; 113 } 114 115 struct sec_path *secpath_set(struct sk_buff *skb) 116 { 117 struct sec_path *sp, *tmp = skb_ext_find(skb, SKB_EXT_SEC_PATH); 118 119 sp = skb_ext_add(skb, SKB_EXT_SEC_PATH); 120 if (!sp) 121 return NULL; 122 123 if (tmp) /* reused existing one (was COW'd if needed) */ 124 return sp; 125 126 /* allocated new secpath */ 127 memset(sp->ovec, 0, sizeof(sp->ovec)); 128 sp->olen = 0; 129 sp->len = 0; 130 131 return sp; 132 } 133 EXPORT_SYMBOL(secpath_set); 134 135 /* Fetch spi and seq from ipsec header */ 136 137 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq) 138 { 139 int offset, offset_seq; 140 int hlen; 141 142 switch (nexthdr) { 143 case IPPROTO_AH: 144 hlen = sizeof(struct ip_auth_hdr); 145 offset = offsetof(struct ip_auth_hdr, spi); 146 offset_seq = offsetof(struct ip_auth_hdr, seq_no); 147 break; 148 case IPPROTO_ESP: 149 hlen = sizeof(struct ip_esp_hdr); 150 offset = offsetof(struct ip_esp_hdr, spi); 151 offset_seq = offsetof(struct ip_esp_hdr, seq_no); 152 break; 153 case IPPROTO_COMP: 154 if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr))) 155 return -EINVAL; 156 *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2))); 157 *seq = 0; 158 return 0; 159 default: 160 return 1; 161 } 162 163 if (!pskb_may_pull(skb, hlen)) 164 return -EINVAL; 165 166 *spi = *(__be32 *)(skb_transport_header(skb) + offset); 167 *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq); 168 return 0; 169 } 170 EXPORT_SYMBOL(xfrm_parse_spi); 171 172 static int xfrm4_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb) 173 { 174 struct iphdr *iph; 175 int optlen = 0; 176 int err = -EINVAL; 177 178 if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) { 179 struct ip_beet_phdr *ph; 180 int phlen; 181 182 if (!pskb_may_pull(skb, sizeof(*ph))) 183 goto out; 184 185 ph = (struct ip_beet_phdr *)skb->data; 186 187 phlen = sizeof(*ph) + ph->padlen; 188 optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen); 189 if (optlen < 0 || optlen & 3 || optlen > 250) 190 goto out; 191 192 XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr; 193 194 if (!pskb_may_pull(skb, phlen)) 195 goto out; 196 __skb_pull(skb, phlen); 197 } 198 199 skb_push(skb, sizeof(*iph)); 200 skb_reset_network_header(skb); 201 skb_mac_header_rebuild(skb); 202 203 xfrm4_beet_make_header(skb); 204 205 iph = ip_hdr(skb); 206 207 iph->ihl += optlen / 4; 208 iph->tot_len = htons(skb->len); 209 iph->daddr = x->sel.daddr.a4; 210 iph->saddr = x->sel.saddr.a4; 211 iph->check = 0; 212 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 213 err = 0; 214 out: 215 return err; 216 } 217 218 static void ipip_ecn_decapsulate(struct sk_buff *skb) 219 { 220 struct iphdr *inner_iph = ipip_hdr(skb); 221 222 if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos)) 223 IP_ECN_set_ce(inner_iph); 224 } 225 226 static int xfrm4_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb) 227 { 228 int err = -EINVAL; 229 230 if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPIP) 231 goto out; 232 233 if (!pskb_may_pull(skb, sizeof(struct iphdr))) 234 goto out; 235 236 err = skb_unclone(skb, GFP_ATOMIC); 237 if (err) 238 goto out; 239 240 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 241 ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb)); 242 if (!(x->props.flags & XFRM_STATE_NOECN)) 243 ipip_ecn_decapsulate(skb); 244 245 skb_reset_network_header(skb); 246 skb_mac_header_rebuild(skb); 247 if (skb->mac_len) 248 eth_hdr(skb)->h_proto = skb->protocol; 249 250 err = 0; 251 252 out: 253 return err; 254 } 255 256 static void ipip6_ecn_decapsulate(struct sk_buff *skb) 257 { 258 struct ipv6hdr *inner_iph = ipipv6_hdr(skb); 259 260 if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos)) 261 IP6_ECN_set_ce(skb, inner_iph); 262 } 263 264 static int xfrm6_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb) 265 { 266 int err = -EINVAL; 267 268 if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6) 269 goto out; 270 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 271 goto out; 272 273 err = skb_unclone(skb, GFP_ATOMIC); 274 if (err) 275 goto out; 276 277 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 278 ipv6_copy_dscp(ipv6_get_dsfield(ipv6_hdr(skb)), 279 ipipv6_hdr(skb)); 280 if (!(x->props.flags & XFRM_STATE_NOECN)) 281 ipip6_ecn_decapsulate(skb); 282 283 skb_reset_network_header(skb); 284 skb_mac_header_rebuild(skb); 285 if (skb->mac_len) 286 eth_hdr(skb)->h_proto = skb->protocol; 287 288 err = 0; 289 290 out: 291 return err; 292 } 293 294 static int xfrm6_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb) 295 { 296 struct ipv6hdr *ip6h; 297 int size = sizeof(struct ipv6hdr); 298 int err; 299 300 err = skb_cow_head(skb, size + skb->mac_len); 301 if (err) 302 goto out; 303 304 __skb_push(skb, size); 305 skb_reset_network_header(skb); 306 skb_mac_header_rebuild(skb); 307 308 xfrm6_beet_make_header(skb); 309 310 ip6h = ipv6_hdr(skb); 311 ip6h->payload_len = htons(skb->len - size); 312 ip6h->daddr = x->sel.daddr.in6; 313 ip6h->saddr = x->sel.saddr.in6; 314 err = 0; 315 out: 316 return err; 317 } 318 319 /* Remove encapsulation header. 320 * 321 * The IP header will be moved over the top of the encapsulation 322 * header. 323 * 324 * On entry, the transport header shall point to where the IP header 325 * should be and the network header shall be set to where the IP 326 * header currently is. skb->data shall point to the start of the 327 * payload. 328 */ 329 static int 330 xfrm_inner_mode_encap_remove(struct xfrm_state *x, 331 const struct xfrm_mode *inner_mode, 332 struct sk_buff *skb) 333 { 334 switch (inner_mode->encap) { 335 case XFRM_MODE_BEET: 336 if (inner_mode->family == AF_INET) 337 return xfrm4_remove_beet_encap(x, skb); 338 if (inner_mode->family == AF_INET6) 339 return xfrm6_remove_beet_encap(x, skb); 340 break; 341 case XFRM_MODE_TUNNEL: 342 if (inner_mode->family == AF_INET) 343 return xfrm4_remove_tunnel_encap(x, skb); 344 if (inner_mode->family == AF_INET6) 345 return xfrm6_remove_tunnel_encap(x, skb); 346 break; 347 } 348 349 WARN_ON_ONCE(1); 350 return -EOPNOTSUPP; 351 } 352 353 static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb) 354 { 355 const struct xfrm_mode *inner_mode = &x->inner_mode; 356 357 switch (x->outer_mode.family) { 358 case AF_INET: 359 xfrm4_extract_header(skb); 360 break; 361 case AF_INET6: 362 xfrm6_extract_header(skb); 363 break; 364 default: 365 WARN_ON_ONCE(1); 366 return -EAFNOSUPPORT; 367 } 368 369 if (x->sel.family == AF_UNSPEC) { 370 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); 371 if (!inner_mode) 372 return -EAFNOSUPPORT; 373 } 374 375 switch (inner_mode->family) { 376 case AF_INET: 377 skb->protocol = htons(ETH_P_IP); 378 break; 379 case AF_INET6: 380 skb->protocol = htons(ETH_P_IPV6); 381 break; 382 default: 383 WARN_ON_ONCE(1); 384 break; 385 } 386 387 return xfrm_inner_mode_encap_remove(x, inner_mode, skb); 388 } 389 390 /* Remove encapsulation header. 391 * 392 * The IP header will be moved over the top of the encapsulation header. 393 * 394 * On entry, skb_transport_header() shall point to where the IP header 395 * should be and skb_network_header() shall be set to where the IP header 396 * currently is. skb->data shall point to the start of the payload. 397 */ 398 static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb) 399 { 400 int ihl = skb->data - skb_transport_header(skb); 401 402 if (skb->transport_header != skb->network_header) { 403 memmove(skb_transport_header(skb), 404 skb_network_header(skb), ihl); 405 skb->network_header = skb->transport_header; 406 } 407 ip_hdr(skb)->tot_len = htons(skb->len + ihl); 408 skb_reset_transport_header(skb); 409 return 0; 410 } 411 412 static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb) 413 { 414 #if IS_ENABLED(CONFIG_IPV6) 415 int ihl = skb->data - skb_transport_header(skb); 416 417 if (skb->transport_header != skb->network_header) { 418 memmove(skb_transport_header(skb), 419 skb_network_header(skb), ihl); 420 skb->network_header = skb->transport_header; 421 } 422 ipv6_hdr(skb)->payload_len = htons(skb->len + ihl - 423 sizeof(struct ipv6hdr)); 424 skb_reset_transport_header(skb); 425 return 0; 426 #else 427 WARN_ON_ONCE(1); 428 return -EAFNOSUPPORT; 429 #endif 430 } 431 432 static int xfrm_inner_mode_input(struct xfrm_state *x, 433 const struct xfrm_mode *inner_mode, 434 struct sk_buff *skb) 435 { 436 switch (inner_mode->encap) { 437 case XFRM_MODE_BEET: 438 case XFRM_MODE_TUNNEL: 439 return xfrm_prepare_input(x, skb); 440 case XFRM_MODE_TRANSPORT: 441 if (inner_mode->family == AF_INET) 442 return xfrm4_transport_input(x, skb); 443 if (inner_mode->family == AF_INET6) 444 return xfrm6_transport_input(x, skb); 445 break; 446 case XFRM_MODE_ROUTEOPTIMIZATION: 447 WARN_ON_ONCE(1); 448 break; 449 default: 450 WARN_ON_ONCE(1); 451 break; 452 } 453 454 return -EOPNOTSUPP; 455 } 456 457 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) 458 { 459 const struct xfrm_state_afinfo *afinfo; 460 struct net *net = dev_net(skb->dev); 461 const struct xfrm_mode *inner_mode; 462 int err; 463 __be32 seq; 464 __be32 seq_hi; 465 struct xfrm_state *x = NULL; 466 xfrm_address_t *daddr; 467 u32 mark = skb->mark; 468 unsigned int family = AF_UNSPEC; 469 int decaps = 0; 470 int async = 0; 471 bool xfrm_gro = false; 472 bool crypto_done = false; 473 struct xfrm_offload *xo = xfrm_offload(skb); 474 struct sec_path *sp; 475 476 if (encap_type < 0) { 477 x = xfrm_input_state(skb); 478 479 if (unlikely(x->km.state != XFRM_STATE_VALID)) { 480 if (x->km.state == XFRM_STATE_ACQ) 481 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); 482 else 483 XFRM_INC_STATS(net, 484 LINUX_MIB_XFRMINSTATEINVALID); 485 486 if (encap_type == -1) 487 dev_put(skb->dev); 488 goto drop; 489 } 490 491 family = x->outer_mode.family; 492 493 /* An encap_type of -1 indicates async resumption. */ 494 if (encap_type == -1) { 495 async = 1; 496 seq = XFRM_SKB_CB(skb)->seq.input.low; 497 goto resume; 498 } 499 500 /* encap_type < -1 indicates a GRO call. */ 501 encap_type = 0; 502 seq = XFRM_SPI_SKB_CB(skb)->seq; 503 504 if (xo && (xo->flags & CRYPTO_DONE)) { 505 crypto_done = true; 506 family = XFRM_SPI_SKB_CB(skb)->family; 507 508 if (!(xo->status & CRYPTO_SUCCESS)) { 509 if (xo->status & 510 (CRYPTO_TRANSPORT_AH_AUTH_FAILED | 511 CRYPTO_TRANSPORT_ESP_AUTH_FAILED | 512 CRYPTO_TUNNEL_AH_AUTH_FAILED | 513 CRYPTO_TUNNEL_ESP_AUTH_FAILED)) { 514 515 xfrm_audit_state_icvfail(x, skb, 516 x->type->proto); 517 x->stats.integrity_failed++; 518 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); 519 goto drop; 520 } 521 522 if (xo->status & CRYPTO_INVALID_PROTOCOL) { 523 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); 524 goto drop; 525 } 526 527 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); 528 goto drop; 529 } 530 531 if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) { 532 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); 533 goto drop; 534 } 535 } 536 537 goto lock; 538 } 539 540 family = XFRM_SPI_SKB_CB(skb)->family; 541 542 /* if tunnel is present override skb->mark value with tunnel i_key */ 543 switch (family) { 544 case AF_INET: 545 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 546 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key); 547 break; 548 case AF_INET6: 549 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 550 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key); 551 break; 552 } 553 554 sp = secpath_set(skb); 555 if (!sp) { 556 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); 557 goto drop; 558 } 559 560 seq = 0; 561 if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) { 562 secpath_reset(skb); 563 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); 564 goto drop; 565 } 566 567 daddr = (xfrm_address_t *)(skb_network_header(skb) + 568 XFRM_SPI_SKB_CB(skb)->daddroff); 569 do { 570 sp = skb_sec_path(skb); 571 572 if (sp->len == XFRM_MAX_DEPTH) { 573 secpath_reset(skb); 574 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); 575 goto drop; 576 } 577 578 x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family); 579 if (x == NULL) { 580 secpath_reset(skb); 581 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); 582 xfrm_audit_state_notfound(skb, family, spi, seq); 583 goto drop; 584 } 585 586 skb->mark = xfrm_smark_get(skb->mark, x); 587 588 sp->xvec[sp->len++] = x; 589 590 skb_dst_force(skb); 591 if (!skb_dst(skb)) { 592 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); 593 goto drop; 594 } 595 596 lock: 597 spin_lock(&x->lock); 598 599 if (unlikely(x->km.state != XFRM_STATE_VALID)) { 600 if (x->km.state == XFRM_STATE_ACQ) 601 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); 602 else 603 XFRM_INC_STATS(net, 604 LINUX_MIB_XFRMINSTATEINVALID); 605 goto drop_unlock; 606 } 607 608 if ((x->encap ? x->encap->encap_type : 0) != encap_type) { 609 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); 610 goto drop_unlock; 611 } 612 613 if (x->repl->check(x, skb, seq)) { 614 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); 615 goto drop_unlock; 616 } 617 618 if (xfrm_state_check_expire(x)) { 619 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED); 620 goto drop_unlock; 621 } 622 623 spin_unlock(&x->lock); 624 625 if (xfrm_tunnel_check(skb, x, family)) { 626 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); 627 goto drop; 628 } 629 630 seq_hi = htonl(xfrm_replay_seqhi(x, seq)); 631 632 XFRM_SKB_CB(skb)->seq.input.low = seq; 633 XFRM_SKB_CB(skb)->seq.input.hi = seq_hi; 634 635 dev_hold(skb->dev); 636 637 if (crypto_done) 638 nexthdr = x->type_offload->input_tail(x, skb); 639 else 640 nexthdr = x->type->input(x, skb); 641 642 if (nexthdr == -EINPROGRESS) 643 return 0; 644 resume: 645 dev_put(skb->dev); 646 647 spin_lock(&x->lock); 648 if (nexthdr < 0) { 649 if (nexthdr == -EBADMSG) { 650 xfrm_audit_state_icvfail(x, skb, 651 x->type->proto); 652 x->stats.integrity_failed++; 653 } 654 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); 655 goto drop_unlock; 656 } 657 658 /* only the first xfrm gets the encap type */ 659 encap_type = 0; 660 661 if (async && x->repl->recheck(x, skb, seq)) { 662 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); 663 goto drop_unlock; 664 } 665 666 x->repl->advance(x, seq); 667 668 x->curlft.bytes += skb->len; 669 x->curlft.packets++; 670 671 spin_unlock(&x->lock); 672 673 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr; 674 675 inner_mode = &x->inner_mode; 676 677 if (x->sel.family == AF_UNSPEC) { 678 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); 679 if (inner_mode == NULL) { 680 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); 681 goto drop; 682 } 683 } 684 685 if (xfrm_inner_mode_input(x, inner_mode, skb)) { 686 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); 687 goto drop; 688 } 689 690 if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) { 691 decaps = 1; 692 break; 693 } 694 695 /* 696 * We need the inner address. However, we only get here for 697 * transport mode so the outer address is identical. 698 */ 699 daddr = &x->id.daddr; 700 family = x->outer_mode.family; 701 702 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq); 703 if (err < 0) { 704 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); 705 goto drop; 706 } 707 crypto_done = false; 708 } while (!err); 709 710 err = xfrm_rcv_cb(skb, family, x->type->proto, 0); 711 if (err) 712 goto drop; 713 714 nf_reset_ct(skb); 715 716 if (decaps) { 717 sp = skb_sec_path(skb); 718 if (sp) 719 sp->olen = 0; 720 skb_dst_drop(skb); 721 gro_cells_receive(&gro_cells, skb); 722 return 0; 723 } else { 724 xo = xfrm_offload(skb); 725 if (xo) 726 xfrm_gro = xo->flags & XFRM_GRO; 727 728 err = -EAFNOSUPPORT; 729 rcu_read_lock(); 730 afinfo = xfrm_state_afinfo_get_rcu(x->inner_mode.family); 731 if (likely(afinfo)) 732 err = afinfo->transport_finish(skb, xfrm_gro || async); 733 rcu_read_unlock(); 734 if (xfrm_gro) { 735 sp = skb_sec_path(skb); 736 if (sp) 737 sp->olen = 0; 738 skb_dst_drop(skb); 739 gro_cells_receive(&gro_cells, skb); 740 return err; 741 } 742 743 return err; 744 } 745 746 drop_unlock: 747 spin_unlock(&x->lock); 748 drop: 749 xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1); 750 kfree_skb(skb); 751 return 0; 752 } 753 EXPORT_SYMBOL(xfrm_input); 754 755 int xfrm_input_resume(struct sk_buff *skb, int nexthdr) 756 { 757 return xfrm_input(skb, nexthdr, 0, -1); 758 } 759 EXPORT_SYMBOL(xfrm_input_resume); 760 761 static void xfrm_trans_reinject(unsigned long data) 762 { 763 struct xfrm_trans_tasklet *trans = (void *)data; 764 struct sk_buff_head queue; 765 struct sk_buff *skb; 766 767 __skb_queue_head_init(&queue); 768 skb_queue_splice_init(&trans->queue, &queue); 769 770 while ((skb = __skb_dequeue(&queue))) 771 XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net, 772 NULL, skb); 773 } 774 775 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 776 int (*finish)(struct net *, struct sock *, 777 struct sk_buff *)) 778 { 779 struct xfrm_trans_tasklet *trans; 780 781 trans = this_cpu_ptr(&xfrm_trans_tasklet); 782 783 if (skb_queue_len(&trans->queue) >= netdev_max_backlog) 784 return -ENOBUFS; 785 786 BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb)); 787 788 XFRM_TRANS_SKB_CB(skb)->finish = finish; 789 XFRM_TRANS_SKB_CB(skb)->net = net; 790 __skb_queue_tail(&trans->queue, skb); 791 tasklet_schedule(&trans->tasklet); 792 return 0; 793 } 794 EXPORT_SYMBOL(xfrm_trans_queue_net); 795 796 int xfrm_trans_queue(struct sk_buff *skb, 797 int (*finish)(struct net *, struct sock *, 798 struct sk_buff *)) 799 { 800 return xfrm_trans_queue_net(dev_net(skb->dev), skb, finish); 801 } 802 EXPORT_SYMBOL(xfrm_trans_queue); 803 804 void __init xfrm_input_init(void) 805 { 806 int err; 807 int i; 808 809 init_dummy_netdev(&xfrm_napi_dev); 810 err = gro_cells_init(&gro_cells, &xfrm_napi_dev); 811 if (err) 812 gro_cells.cells = NULL; 813 814 for_each_possible_cpu(i) { 815 struct xfrm_trans_tasklet *trans; 816 817 trans = &per_cpu(xfrm_trans_tasklet, i); 818 __skb_queue_head_init(&trans->queue); 819 tasklet_init(&trans->tasklet, xfrm_trans_reinject, 820 (unsigned long)trans); 821 } 822 } 823