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