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[2][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 > AF_INET6)) 57 return -EAFNOSUPPORT; 58 59 spin_lock_bh(&xfrm_input_afinfo_lock); 60 if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family])) 61 err = -EEXIST; 62 else 63 rcu_assign_pointer(xfrm_input_afinfo[afinfo->is_ipip][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->is_ipip][afinfo->family])) { 75 if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family] != afinfo)) 76 err = -EINVAL; 77 else 78 RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->is_ipip][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(u8 family, bool is_ipip) 87 { 88 const struct xfrm_input_afinfo *afinfo; 89 90 if (WARN_ON_ONCE(family > AF_INET6)) 91 return NULL; 92 93 rcu_read_lock(); 94 afinfo = rcu_dereference(xfrm_input_afinfo[is_ipip][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 bool is_ipip = (protocol == IPPROTO_IPIP || protocol == IPPROTO_IPV6); 104 const struct xfrm_input_afinfo *afinfo; 105 int ret; 106 107 afinfo = xfrm_input_get_afinfo(family, is_ipip); 108 if (!afinfo) 109 return -EAFNOSUPPORT; 110 111 ret = afinfo->callback(skb, protocol, err); 112 rcu_read_unlock(); 113 114 return ret; 115 } 116 117 struct sec_path *secpath_set(struct sk_buff *skb) 118 { 119 struct sec_path *sp, *tmp = skb_ext_find(skb, SKB_EXT_SEC_PATH); 120 121 sp = skb_ext_add(skb, SKB_EXT_SEC_PATH); 122 if (!sp) 123 return NULL; 124 125 if (tmp) /* reused existing one (was COW'd if needed) */ 126 return sp; 127 128 /* allocated new secpath */ 129 memset(sp->ovec, 0, sizeof(sp->ovec)); 130 sp->olen = 0; 131 sp->len = 0; 132 133 return sp; 134 } 135 EXPORT_SYMBOL(secpath_set); 136 137 /* Fetch spi and seq from ipsec header */ 138 139 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq) 140 { 141 int offset, offset_seq; 142 int hlen; 143 144 switch (nexthdr) { 145 case IPPROTO_AH: 146 hlen = sizeof(struct ip_auth_hdr); 147 offset = offsetof(struct ip_auth_hdr, spi); 148 offset_seq = offsetof(struct ip_auth_hdr, seq_no); 149 break; 150 case IPPROTO_ESP: 151 hlen = sizeof(struct ip_esp_hdr); 152 offset = offsetof(struct ip_esp_hdr, spi); 153 offset_seq = offsetof(struct ip_esp_hdr, seq_no); 154 break; 155 case IPPROTO_COMP: 156 if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr))) 157 return -EINVAL; 158 *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2))); 159 *seq = 0; 160 return 0; 161 default: 162 return 1; 163 } 164 165 if (!pskb_may_pull(skb, hlen)) 166 return -EINVAL; 167 168 *spi = *(__be32 *)(skb_transport_header(skb) + offset); 169 *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq); 170 return 0; 171 } 172 EXPORT_SYMBOL(xfrm_parse_spi); 173 174 static int xfrm4_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb) 175 { 176 struct iphdr *iph; 177 int optlen = 0; 178 int err = -EINVAL; 179 180 if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) { 181 struct ip_beet_phdr *ph; 182 int phlen; 183 184 if (!pskb_may_pull(skb, sizeof(*ph))) 185 goto out; 186 187 ph = (struct ip_beet_phdr *)skb->data; 188 189 phlen = sizeof(*ph) + ph->padlen; 190 optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen); 191 if (optlen < 0 || optlen & 3 || optlen > 250) 192 goto out; 193 194 XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr; 195 196 if (!pskb_may_pull(skb, phlen)) 197 goto out; 198 __skb_pull(skb, phlen); 199 } 200 201 skb_push(skb, sizeof(*iph)); 202 skb_reset_network_header(skb); 203 skb_mac_header_rebuild(skb); 204 205 xfrm4_beet_make_header(skb); 206 207 iph = ip_hdr(skb); 208 209 iph->ihl += optlen / 4; 210 iph->tot_len = htons(skb->len); 211 iph->daddr = x->sel.daddr.a4; 212 iph->saddr = x->sel.saddr.a4; 213 iph->check = 0; 214 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); 215 err = 0; 216 out: 217 return err; 218 } 219 220 static void ipip_ecn_decapsulate(struct sk_buff *skb) 221 { 222 struct iphdr *inner_iph = ipip_hdr(skb); 223 224 if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos)) 225 IP_ECN_set_ce(inner_iph); 226 } 227 228 static int xfrm4_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb) 229 { 230 int err = -EINVAL; 231 232 if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPIP) 233 goto out; 234 235 if (!pskb_may_pull(skb, sizeof(struct iphdr))) 236 goto out; 237 238 err = skb_unclone(skb, GFP_ATOMIC); 239 if (err) 240 goto out; 241 242 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 243 ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb)); 244 if (!(x->props.flags & XFRM_STATE_NOECN)) 245 ipip_ecn_decapsulate(skb); 246 247 skb_reset_network_header(skb); 248 skb_mac_header_rebuild(skb); 249 if (skb->mac_len) 250 eth_hdr(skb)->h_proto = skb->protocol; 251 252 err = 0; 253 254 out: 255 return err; 256 } 257 258 static void ipip6_ecn_decapsulate(struct sk_buff *skb) 259 { 260 struct ipv6hdr *inner_iph = ipipv6_hdr(skb); 261 262 if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos)) 263 IP6_ECN_set_ce(skb, inner_iph); 264 } 265 266 static int xfrm6_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb) 267 { 268 int err = -EINVAL; 269 270 if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6) 271 goto out; 272 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 273 goto out; 274 275 err = skb_unclone(skb, GFP_ATOMIC); 276 if (err) 277 goto out; 278 279 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 280 ipv6_copy_dscp(ipv6_get_dsfield(ipv6_hdr(skb)), 281 ipipv6_hdr(skb)); 282 if (!(x->props.flags & XFRM_STATE_NOECN)) 283 ipip6_ecn_decapsulate(skb); 284 285 skb_reset_network_header(skb); 286 skb_mac_header_rebuild(skb); 287 if (skb->mac_len) 288 eth_hdr(skb)->h_proto = skb->protocol; 289 290 err = 0; 291 292 out: 293 return err; 294 } 295 296 static int xfrm6_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb) 297 { 298 struct ipv6hdr *ip6h; 299 int size = sizeof(struct ipv6hdr); 300 int err; 301 302 err = skb_cow_head(skb, size + skb->mac_len); 303 if (err) 304 goto out; 305 306 __skb_push(skb, size); 307 skb_reset_network_header(skb); 308 skb_mac_header_rebuild(skb); 309 310 xfrm6_beet_make_header(skb); 311 312 ip6h = ipv6_hdr(skb); 313 ip6h->payload_len = htons(skb->len - size); 314 ip6h->daddr = x->sel.daddr.in6; 315 ip6h->saddr = x->sel.saddr.in6; 316 err = 0; 317 out: 318 return err; 319 } 320 321 /* Remove encapsulation header. 322 * 323 * The IP header will be moved over the top of the encapsulation 324 * header. 325 * 326 * On entry, the transport header shall point to where the IP header 327 * should be and the network header shall be set to where the IP 328 * header currently is. skb->data shall point to the start of the 329 * payload. 330 */ 331 static int 332 xfrm_inner_mode_encap_remove(struct xfrm_state *x, 333 const struct xfrm_mode *inner_mode, 334 struct sk_buff *skb) 335 { 336 switch (inner_mode->encap) { 337 case XFRM_MODE_BEET: 338 if (inner_mode->family == AF_INET) 339 return xfrm4_remove_beet_encap(x, skb); 340 if (inner_mode->family == AF_INET6) 341 return xfrm6_remove_beet_encap(x, skb); 342 break; 343 case XFRM_MODE_TUNNEL: 344 if (inner_mode->family == AF_INET) 345 return xfrm4_remove_tunnel_encap(x, skb); 346 if (inner_mode->family == AF_INET6) 347 return xfrm6_remove_tunnel_encap(x, skb); 348 break; 349 } 350 351 WARN_ON_ONCE(1); 352 return -EOPNOTSUPP; 353 } 354 355 static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb) 356 { 357 const struct xfrm_mode *inner_mode = &x->inner_mode; 358 359 switch (x->outer_mode.family) { 360 case AF_INET: 361 xfrm4_extract_header(skb); 362 break; 363 case AF_INET6: 364 xfrm6_extract_header(skb); 365 break; 366 default: 367 WARN_ON_ONCE(1); 368 return -EAFNOSUPPORT; 369 } 370 371 if (x->sel.family == AF_UNSPEC) { 372 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); 373 if (!inner_mode) 374 return -EAFNOSUPPORT; 375 } 376 377 switch (inner_mode->family) { 378 case AF_INET: 379 skb->protocol = htons(ETH_P_IP); 380 break; 381 case AF_INET6: 382 skb->protocol = htons(ETH_P_IPV6); 383 break; 384 default: 385 WARN_ON_ONCE(1); 386 break; 387 } 388 389 return xfrm_inner_mode_encap_remove(x, inner_mode, skb); 390 } 391 392 /* Remove encapsulation header. 393 * 394 * The IP header will be moved over the top of the encapsulation header. 395 * 396 * On entry, skb_transport_header() shall point to where the IP header 397 * should be and skb_network_header() shall be set to where the IP header 398 * currently is. skb->data shall point to the start of the payload. 399 */ 400 static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb) 401 { 402 int ihl = skb->data - skb_transport_header(skb); 403 404 if (skb->transport_header != skb->network_header) { 405 memmove(skb_transport_header(skb), 406 skb_network_header(skb), ihl); 407 skb->network_header = skb->transport_header; 408 } 409 ip_hdr(skb)->tot_len = htons(skb->len + ihl); 410 skb_reset_transport_header(skb); 411 return 0; 412 } 413 414 static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb) 415 { 416 #if IS_ENABLED(CONFIG_IPV6) 417 int ihl = skb->data - skb_transport_header(skb); 418 419 if (skb->transport_header != skb->network_header) { 420 memmove(skb_transport_header(skb), 421 skb_network_header(skb), ihl); 422 skb->network_header = skb->transport_header; 423 } 424 ipv6_hdr(skb)->payload_len = htons(skb->len + ihl - 425 sizeof(struct ipv6hdr)); 426 skb_reset_transport_header(skb); 427 return 0; 428 #else 429 WARN_ON_ONCE(1); 430 return -EAFNOSUPPORT; 431 #endif 432 } 433 434 static int xfrm_inner_mode_input(struct xfrm_state *x, 435 const struct xfrm_mode *inner_mode, 436 struct sk_buff *skb) 437 { 438 switch (inner_mode->encap) { 439 case XFRM_MODE_BEET: 440 case XFRM_MODE_TUNNEL: 441 return xfrm_prepare_input(x, skb); 442 case XFRM_MODE_TRANSPORT: 443 if (inner_mode->family == AF_INET) 444 return xfrm4_transport_input(x, skb); 445 if (inner_mode->family == AF_INET6) 446 return xfrm6_transport_input(x, skb); 447 break; 448 case XFRM_MODE_ROUTEOPTIMIZATION: 449 WARN_ON_ONCE(1); 450 break; 451 default: 452 WARN_ON_ONCE(1); 453 break; 454 } 455 456 return -EOPNOTSUPP; 457 } 458 459 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) 460 { 461 const struct xfrm_state_afinfo *afinfo; 462 struct net *net = dev_net(skb->dev); 463 const struct xfrm_mode *inner_mode; 464 int err; 465 __be32 seq; 466 __be32 seq_hi; 467 struct xfrm_state *x = NULL; 468 xfrm_address_t *daddr; 469 u32 mark = skb->mark; 470 unsigned int family = AF_UNSPEC; 471 int decaps = 0; 472 int async = 0; 473 bool xfrm_gro = false; 474 bool crypto_done = false; 475 struct xfrm_offload *xo = xfrm_offload(skb); 476 struct sec_path *sp; 477 478 if (encap_type < 0) { 479 x = xfrm_input_state(skb); 480 481 if (unlikely(x->km.state != XFRM_STATE_VALID)) { 482 if (x->km.state == XFRM_STATE_ACQ) 483 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); 484 else 485 XFRM_INC_STATS(net, 486 LINUX_MIB_XFRMINSTATEINVALID); 487 488 if (encap_type == -1) 489 dev_put(skb->dev); 490 goto drop; 491 } 492 493 family = x->outer_mode.family; 494 495 /* An encap_type of -1 indicates async resumption. */ 496 if (encap_type == -1) { 497 async = 1; 498 seq = XFRM_SKB_CB(skb)->seq.input.low; 499 goto resume; 500 } 501 502 /* encap_type < -1 indicates a GRO call. */ 503 encap_type = 0; 504 seq = XFRM_SPI_SKB_CB(skb)->seq; 505 506 if (xo && (xo->flags & CRYPTO_DONE)) { 507 crypto_done = true; 508 family = XFRM_SPI_SKB_CB(skb)->family; 509 510 if (!(xo->status & CRYPTO_SUCCESS)) { 511 if (xo->status & 512 (CRYPTO_TRANSPORT_AH_AUTH_FAILED | 513 CRYPTO_TRANSPORT_ESP_AUTH_FAILED | 514 CRYPTO_TUNNEL_AH_AUTH_FAILED | 515 CRYPTO_TUNNEL_ESP_AUTH_FAILED)) { 516 517 xfrm_audit_state_icvfail(x, skb, 518 x->type->proto); 519 x->stats.integrity_failed++; 520 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); 521 goto drop; 522 } 523 524 if (xo->status & CRYPTO_INVALID_PROTOCOL) { 525 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); 526 goto drop; 527 } 528 529 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); 530 goto drop; 531 } 532 533 if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) { 534 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); 535 goto drop; 536 } 537 } 538 539 goto lock; 540 } 541 542 family = XFRM_SPI_SKB_CB(skb)->family; 543 544 /* if tunnel is present override skb->mark value with tunnel i_key */ 545 switch (family) { 546 case AF_INET: 547 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 548 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key); 549 break; 550 case AF_INET6: 551 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 552 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key); 553 break; 554 } 555 556 sp = secpath_set(skb); 557 if (!sp) { 558 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); 559 goto drop; 560 } 561 562 seq = 0; 563 if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) { 564 secpath_reset(skb); 565 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); 566 goto drop; 567 } 568 569 daddr = (xfrm_address_t *)(skb_network_header(skb) + 570 XFRM_SPI_SKB_CB(skb)->daddroff); 571 do { 572 sp = skb_sec_path(skb); 573 574 if (sp->len == XFRM_MAX_DEPTH) { 575 secpath_reset(skb); 576 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); 577 goto drop; 578 } 579 580 x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family); 581 if (x == NULL) { 582 secpath_reset(skb); 583 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); 584 xfrm_audit_state_notfound(skb, family, spi, seq); 585 goto drop; 586 } 587 588 skb->mark = xfrm_smark_get(skb->mark, x); 589 590 sp->xvec[sp->len++] = x; 591 592 skb_dst_force(skb); 593 if (!skb_dst(skb)) { 594 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); 595 goto drop; 596 } 597 598 lock: 599 spin_lock(&x->lock); 600 601 if (unlikely(x->km.state != XFRM_STATE_VALID)) { 602 if (x->km.state == XFRM_STATE_ACQ) 603 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); 604 else 605 XFRM_INC_STATS(net, 606 LINUX_MIB_XFRMINSTATEINVALID); 607 goto drop_unlock; 608 } 609 610 if ((x->encap ? x->encap->encap_type : 0) != encap_type) { 611 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); 612 goto drop_unlock; 613 } 614 615 if (x->repl->check(x, skb, seq)) { 616 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); 617 goto drop_unlock; 618 } 619 620 if (xfrm_state_check_expire(x)) { 621 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED); 622 goto drop_unlock; 623 } 624 625 spin_unlock(&x->lock); 626 627 if (xfrm_tunnel_check(skb, x, family)) { 628 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); 629 goto drop; 630 } 631 632 seq_hi = htonl(xfrm_replay_seqhi(x, seq)); 633 634 XFRM_SKB_CB(skb)->seq.input.low = seq; 635 XFRM_SKB_CB(skb)->seq.input.hi = seq_hi; 636 637 dev_hold(skb->dev); 638 639 if (crypto_done) 640 nexthdr = x->type_offload->input_tail(x, skb); 641 else 642 nexthdr = x->type->input(x, skb); 643 644 if (nexthdr == -EINPROGRESS) 645 return 0; 646 resume: 647 dev_put(skb->dev); 648 649 spin_lock(&x->lock); 650 if (nexthdr < 0) { 651 if (nexthdr == -EBADMSG) { 652 xfrm_audit_state_icvfail(x, skb, 653 x->type->proto); 654 x->stats.integrity_failed++; 655 } 656 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); 657 goto drop_unlock; 658 } 659 660 /* only the first xfrm gets the encap type */ 661 encap_type = 0; 662 663 if (x->repl->recheck(x, skb, seq)) { 664 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); 665 goto drop_unlock; 666 } 667 668 x->repl->advance(x, seq); 669 670 x->curlft.bytes += skb->len; 671 x->curlft.packets++; 672 673 spin_unlock(&x->lock); 674 675 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr; 676 677 inner_mode = &x->inner_mode; 678 679 if (x->sel.family == AF_UNSPEC) { 680 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); 681 if (inner_mode == NULL) { 682 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); 683 goto drop; 684 } 685 } 686 687 if (xfrm_inner_mode_input(x, inner_mode, skb)) { 688 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); 689 goto drop; 690 } 691 692 if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) { 693 decaps = 1; 694 break; 695 } 696 697 /* 698 * We need the inner address. However, we only get here for 699 * transport mode so the outer address is identical. 700 */ 701 daddr = &x->id.daddr; 702 family = x->outer_mode.family; 703 704 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq); 705 if (err < 0) { 706 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); 707 goto drop; 708 } 709 crypto_done = false; 710 } while (!err); 711 712 err = xfrm_rcv_cb(skb, family, x->type->proto, 0); 713 if (err) 714 goto drop; 715 716 nf_reset_ct(skb); 717 718 if (decaps) { 719 sp = skb_sec_path(skb); 720 if (sp) 721 sp->olen = 0; 722 skb_dst_drop(skb); 723 gro_cells_receive(&gro_cells, skb); 724 return 0; 725 } else { 726 xo = xfrm_offload(skb); 727 if (xo) 728 xfrm_gro = xo->flags & XFRM_GRO; 729 730 err = -EAFNOSUPPORT; 731 rcu_read_lock(); 732 afinfo = xfrm_state_afinfo_get_rcu(x->inner_mode.family); 733 if (likely(afinfo)) 734 err = afinfo->transport_finish(skb, xfrm_gro || async); 735 rcu_read_unlock(); 736 if (xfrm_gro) { 737 sp = skb_sec_path(skb); 738 if (sp) 739 sp->olen = 0; 740 skb_dst_drop(skb); 741 gro_cells_receive(&gro_cells, skb); 742 return err; 743 } 744 745 return err; 746 } 747 748 drop_unlock: 749 spin_unlock(&x->lock); 750 drop: 751 xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1); 752 kfree_skb(skb); 753 return 0; 754 } 755 EXPORT_SYMBOL(xfrm_input); 756 757 int xfrm_input_resume(struct sk_buff *skb, int nexthdr) 758 { 759 return xfrm_input(skb, nexthdr, 0, -1); 760 } 761 EXPORT_SYMBOL(xfrm_input_resume); 762 763 static void xfrm_trans_reinject(struct tasklet_struct *t) 764 { 765 struct xfrm_trans_tasklet *trans = from_tasklet(trans, t, tasklet); 766 struct sk_buff_head queue; 767 struct sk_buff *skb; 768 769 __skb_queue_head_init(&queue); 770 skb_queue_splice_init(&trans->queue, &queue); 771 772 while ((skb = __skb_dequeue(&queue))) 773 XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net, 774 NULL, skb); 775 } 776 777 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 778 int (*finish)(struct net *, struct sock *, 779 struct sk_buff *)) 780 { 781 struct xfrm_trans_tasklet *trans; 782 783 trans = this_cpu_ptr(&xfrm_trans_tasklet); 784 785 if (skb_queue_len(&trans->queue) >= netdev_max_backlog) 786 return -ENOBUFS; 787 788 BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb)); 789 790 XFRM_TRANS_SKB_CB(skb)->finish = finish; 791 XFRM_TRANS_SKB_CB(skb)->net = net; 792 __skb_queue_tail(&trans->queue, skb); 793 tasklet_schedule(&trans->tasklet); 794 return 0; 795 } 796 EXPORT_SYMBOL(xfrm_trans_queue_net); 797 798 int xfrm_trans_queue(struct sk_buff *skb, 799 int (*finish)(struct net *, struct sock *, 800 struct sk_buff *)) 801 { 802 return xfrm_trans_queue_net(dev_net(skb->dev), skb, finish); 803 } 804 EXPORT_SYMBOL(xfrm_trans_queue); 805 806 void __init xfrm_input_init(void) 807 { 808 int err; 809 int i; 810 811 init_dummy_netdev(&xfrm_napi_dev); 812 err = gro_cells_init(&gro_cells, &xfrm_napi_dev); 813 if (err) 814 gro_cells.cells = NULL; 815 816 for_each_possible_cpu(i) { 817 struct xfrm_trans_tasklet *trans; 818 819 trans = &per_cpu(xfrm_trans_tasklet, i); 820 __skb_queue_head_init(&trans->queue); 821 tasklet_setup(&trans->tasklet, xfrm_trans_reinject); 822 } 823 } 824