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