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