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 const struct xfrm_state_afinfo *afinfo; 357 int err = -EAFNOSUPPORT; 358 359 rcu_read_lock(); 360 afinfo = xfrm_state_afinfo_get_rcu(x->outer_mode.family); 361 if (likely(afinfo)) 362 err = afinfo->extract_input(x, skb); 363 rcu_read_unlock(); 364 365 if (err) 366 return err; 367 368 if (x->sel.family == AF_UNSPEC) { 369 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); 370 if (!inner_mode) 371 return -EAFNOSUPPORT; 372 } 373 374 switch (inner_mode->family) { 375 case AF_INET: 376 skb->protocol = htons(ETH_P_IP); 377 break; 378 case AF_INET6: 379 skb->protocol = htons(ETH_P_IPV6); 380 break; 381 default: 382 WARN_ON_ONCE(1); 383 break; 384 } 385 386 return xfrm_inner_mode_encap_remove(x, inner_mode, skb); 387 } 388 389 /* Remove encapsulation header. 390 * 391 * The IP header will be moved over the top of the encapsulation header. 392 * 393 * On entry, skb_transport_header() shall point to where the IP header 394 * should be and skb_network_header() shall be set to where the IP header 395 * currently is. skb->data shall point to the start of the payload. 396 */ 397 static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb) 398 { 399 int ihl = skb->data - skb_transport_header(skb); 400 401 if (skb->transport_header != skb->network_header) { 402 memmove(skb_transport_header(skb), 403 skb_network_header(skb), ihl); 404 skb->network_header = skb->transport_header; 405 } 406 ip_hdr(skb)->tot_len = htons(skb->len + ihl); 407 skb_reset_transport_header(skb); 408 return 0; 409 } 410 411 static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb) 412 { 413 #if IS_ENABLED(CONFIG_IPV6) 414 int ihl = skb->data - skb_transport_header(skb); 415 416 if (skb->transport_header != skb->network_header) { 417 memmove(skb_transport_header(skb), 418 skb_network_header(skb), ihl); 419 skb->network_header = skb->transport_header; 420 } 421 ipv6_hdr(skb)->payload_len = htons(skb->len + ihl - 422 sizeof(struct ipv6hdr)); 423 skb_reset_transport_header(skb); 424 return 0; 425 #else 426 WARN_ON_ONCE(1); 427 return -EAFNOSUPPORT; 428 #endif 429 } 430 431 static int xfrm_inner_mode_input(struct xfrm_state *x, 432 const struct xfrm_mode *inner_mode, 433 struct sk_buff *skb) 434 { 435 switch (inner_mode->encap) { 436 case XFRM_MODE_BEET: 437 case XFRM_MODE_TUNNEL: 438 return xfrm_prepare_input(x, skb); 439 case XFRM_MODE_TRANSPORT: 440 if (inner_mode->family == AF_INET) 441 return xfrm4_transport_input(x, skb); 442 if (inner_mode->family == AF_INET6) 443 return xfrm6_transport_input(x, skb); 444 break; 445 case XFRM_MODE_ROUTEOPTIMIZATION: 446 WARN_ON_ONCE(1); 447 break; 448 default: 449 WARN_ON_ONCE(1); 450 break; 451 } 452 453 return -EOPNOTSUPP; 454 } 455 456 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) 457 { 458 const struct xfrm_state_afinfo *afinfo; 459 struct net *net = dev_net(skb->dev); 460 const struct xfrm_mode *inner_mode; 461 int err; 462 __be32 seq; 463 __be32 seq_hi; 464 struct xfrm_state *x = NULL; 465 xfrm_address_t *daddr; 466 u32 mark = skb->mark; 467 unsigned int family = AF_UNSPEC; 468 int decaps = 0; 469 int async = 0; 470 bool xfrm_gro = false; 471 bool crypto_done = false; 472 struct xfrm_offload *xo = xfrm_offload(skb); 473 struct sec_path *sp; 474 475 if (encap_type < 0) { 476 x = xfrm_input_state(skb); 477 478 if (unlikely(x->km.state != XFRM_STATE_VALID)) { 479 if (x->km.state == XFRM_STATE_ACQ) 480 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); 481 else 482 XFRM_INC_STATS(net, 483 LINUX_MIB_XFRMINSTATEINVALID); 484 485 if (encap_type == -1) 486 dev_put(skb->dev); 487 goto drop; 488 } 489 490 family = x->outer_mode.family; 491 492 /* An encap_type of -1 indicates async resumption. */ 493 if (encap_type == -1) { 494 async = 1; 495 seq = XFRM_SKB_CB(skb)->seq.input.low; 496 goto resume; 497 } 498 499 /* encap_type < -1 indicates a GRO call. */ 500 encap_type = 0; 501 seq = XFRM_SPI_SKB_CB(skb)->seq; 502 503 if (xo && (xo->flags & CRYPTO_DONE)) { 504 crypto_done = true; 505 family = XFRM_SPI_SKB_CB(skb)->family; 506 507 if (!(xo->status & CRYPTO_SUCCESS)) { 508 if (xo->status & 509 (CRYPTO_TRANSPORT_AH_AUTH_FAILED | 510 CRYPTO_TRANSPORT_ESP_AUTH_FAILED | 511 CRYPTO_TUNNEL_AH_AUTH_FAILED | 512 CRYPTO_TUNNEL_ESP_AUTH_FAILED)) { 513 514 xfrm_audit_state_icvfail(x, skb, 515 x->type->proto); 516 x->stats.integrity_failed++; 517 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); 518 goto drop; 519 } 520 521 if (xo->status & CRYPTO_INVALID_PROTOCOL) { 522 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); 523 goto drop; 524 } 525 526 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); 527 goto drop; 528 } 529 530 if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) { 531 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); 532 goto drop; 533 } 534 } 535 536 goto lock; 537 } 538 539 family = XFRM_SPI_SKB_CB(skb)->family; 540 541 /* if tunnel is present override skb->mark value with tunnel i_key */ 542 switch (family) { 543 case AF_INET: 544 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 545 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key); 546 break; 547 case AF_INET6: 548 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 549 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key); 550 break; 551 } 552 553 sp = secpath_set(skb); 554 if (!sp) { 555 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); 556 goto drop; 557 } 558 559 seq = 0; 560 if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) { 561 secpath_reset(skb); 562 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); 563 goto drop; 564 } 565 566 daddr = (xfrm_address_t *)(skb_network_header(skb) + 567 XFRM_SPI_SKB_CB(skb)->daddroff); 568 do { 569 sp = skb_sec_path(skb); 570 571 if (sp->len == XFRM_MAX_DEPTH) { 572 secpath_reset(skb); 573 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); 574 goto drop; 575 } 576 577 x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family); 578 if (x == NULL) { 579 secpath_reset(skb); 580 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); 581 xfrm_audit_state_notfound(skb, family, spi, seq); 582 goto drop; 583 } 584 585 skb->mark = xfrm_smark_get(skb->mark, x); 586 587 sp->xvec[sp->len++] = x; 588 589 skb_dst_force(skb); 590 if (!skb_dst(skb)) { 591 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); 592 goto drop; 593 } 594 595 lock: 596 spin_lock(&x->lock); 597 598 if (unlikely(x->km.state != XFRM_STATE_VALID)) { 599 if (x->km.state == XFRM_STATE_ACQ) 600 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); 601 else 602 XFRM_INC_STATS(net, 603 LINUX_MIB_XFRMINSTATEINVALID); 604 goto drop_unlock; 605 } 606 607 if ((x->encap ? x->encap->encap_type : 0) != encap_type) { 608 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); 609 goto drop_unlock; 610 } 611 612 if (x->repl->check(x, skb, seq)) { 613 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); 614 goto drop_unlock; 615 } 616 617 if (xfrm_state_check_expire(x)) { 618 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED); 619 goto drop_unlock; 620 } 621 622 spin_unlock(&x->lock); 623 624 if (xfrm_tunnel_check(skb, x, family)) { 625 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); 626 goto drop; 627 } 628 629 seq_hi = htonl(xfrm_replay_seqhi(x, seq)); 630 631 XFRM_SKB_CB(skb)->seq.input.low = seq; 632 XFRM_SKB_CB(skb)->seq.input.hi = seq_hi; 633 634 dev_hold(skb->dev); 635 636 if (crypto_done) 637 nexthdr = x->type_offload->input_tail(x, skb); 638 else 639 nexthdr = x->type->input(x, skb); 640 641 if (nexthdr == -EINPROGRESS) 642 return 0; 643 resume: 644 dev_put(skb->dev); 645 646 spin_lock(&x->lock); 647 if (nexthdr <= 0) { 648 if (nexthdr == -EBADMSG) { 649 xfrm_audit_state_icvfail(x, skb, 650 x->type->proto); 651 x->stats.integrity_failed++; 652 } 653 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); 654 goto drop_unlock; 655 } 656 657 /* only the first xfrm gets the encap type */ 658 encap_type = 0; 659 660 if (async && x->repl->recheck(x, skb, seq)) { 661 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); 662 goto drop_unlock; 663 } 664 665 x->repl->advance(x, seq); 666 667 x->curlft.bytes += skb->len; 668 x->curlft.packets++; 669 670 spin_unlock(&x->lock); 671 672 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr; 673 674 inner_mode = &x->inner_mode; 675 676 if (x->sel.family == AF_UNSPEC) { 677 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); 678 if (inner_mode == NULL) { 679 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); 680 goto drop; 681 } 682 } 683 684 if (xfrm_inner_mode_input(x, inner_mode, skb)) { 685 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); 686 goto drop; 687 } 688 689 if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) { 690 decaps = 1; 691 break; 692 } 693 694 /* 695 * We need the inner address. However, we only get here for 696 * transport mode so the outer address is identical. 697 */ 698 daddr = &x->id.daddr; 699 family = x->outer_mode.family; 700 701 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq); 702 if (err < 0) { 703 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); 704 goto drop; 705 } 706 crypto_done = false; 707 } while (!err); 708 709 err = xfrm_rcv_cb(skb, family, x->type->proto, 0); 710 if (err) 711 goto drop; 712 713 nf_reset_ct(skb); 714 715 if (decaps) { 716 sp = skb_sec_path(skb); 717 if (sp) 718 sp->olen = 0; 719 skb_dst_drop(skb); 720 gro_cells_receive(&gro_cells, skb); 721 return 0; 722 } else { 723 xo = xfrm_offload(skb); 724 if (xo) 725 xfrm_gro = xo->flags & XFRM_GRO; 726 727 err = -EAFNOSUPPORT; 728 rcu_read_lock(); 729 afinfo = xfrm_state_afinfo_get_rcu(x->inner_mode.family); 730 if (likely(afinfo)) 731 err = afinfo->transport_finish(skb, xfrm_gro || async); 732 rcu_read_unlock(); 733 if (xfrm_gro) { 734 sp = skb_sec_path(skb); 735 if (sp) 736 sp->olen = 0; 737 skb_dst_drop(skb); 738 gro_cells_receive(&gro_cells, skb); 739 return err; 740 } 741 742 return err; 743 } 744 745 drop_unlock: 746 spin_unlock(&x->lock); 747 drop: 748 xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1); 749 kfree_skb(skb); 750 return 0; 751 } 752 EXPORT_SYMBOL(xfrm_input); 753 754 int xfrm_input_resume(struct sk_buff *skb, int nexthdr) 755 { 756 return xfrm_input(skb, nexthdr, 0, -1); 757 } 758 EXPORT_SYMBOL(xfrm_input_resume); 759 760 static void xfrm_trans_reinject(unsigned long data) 761 { 762 struct xfrm_trans_tasklet *trans = (void *)data; 763 struct sk_buff_head queue; 764 struct sk_buff *skb; 765 766 __skb_queue_head_init(&queue); 767 skb_queue_splice_init(&trans->queue, &queue); 768 769 while ((skb = __skb_dequeue(&queue))) 770 XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net, 771 NULL, skb); 772 } 773 774 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 775 int (*finish)(struct net *, struct sock *, 776 struct sk_buff *)) 777 { 778 struct xfrm_trans_tasklet *trans; 779 780 trans = this_cpu_ptr(&xfrm_trans_tasklet); 781 782 if (skb_queue_len(&trans->queue) >= netdev_max_backlog) 783 return -ENOBUFS; 784 785 BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb)); 786 787 XFRM_TRANS_SKB_CB(skb)->finish = finish; 788 XFRM_TRANS_SKB_CB(skb)->net = net; 789 __skb_queue_tail(&trans->queue, skb); 790 tasklet_schedule(&trans->tasklet); 791 return 0; 792 } 793 EXPORT_SYMBOL(xfrm_trans_queue_net); 794 795 int xfrm_trans_queue(struct sk_buff *skb, 796 int (*finish)(struct net *, struct sock *, 797 struct sk_buff *)) 798 { 799 return xfrm_trans_queue_net(dev_net(skb->dev), skb, finish); 800 } 801 EXPORT_SYMBOL(xfrm_trans_queue); 802 803 void __init xfrm_input_init(void) 804 { 805 int err; 806 int i; 807 808 init_dummy_netdev(&xfrm_napi_dev); 809 err = gro_cells_init(&gro_cells, &xfrm_napi_dev); 810 if (err) 811 gro_cells.cells = NULL; 812 813 for_each_possible_cpu(i) { 814 struct xfrm_trans_tasklet *trans; 815 816 trans = &per_cpu(xfrm_trans_tasklet, i); 817 __skb_queue_head_init(&trans->queue); 818 tasklet_init(&trans->tasklet, xfrm_trans_reinject, 819 (unsigned long)trans); 820 } 821 } 822