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 27struct xfrm_trans_tasklet { 28 struct work_struct work; 29 spinlock_t queue_lock; 30 struct sk_buff_head queue; 31}; 32 33struct 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 46static DEFINE_SPINLOCK(xfrm_input_afinfo_lock); 47static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[2][AF_INET6 + 1]; 48 49static struct gro_cells gro_cells; 50static struct net_device xfrm_napi_dev; 51 52static DEFINE_PER_CPU(struct xfrm_trans_tasklet, xfrm_trans_tasklet); 53 54int 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} 69EXPORT_SYMBOL(xfrm_input_register_afinfo); 70 71int 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} 86EXPORT_SYMBOL(xfrm_input_unregister_afinfo); 87 88static 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 102static 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 119struct 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} 138EXPORT_SYMBOL(secpath_set); 139 140/* Fetch spi and seq from ipsec header */ 141 142int 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} 175EXPORT_SYMBOL(xfrm_parse_spi); 176 177static 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; 221out: 222 return err; 223} 224 225static 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 233static 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 258out: 259 return err; 260} 261 262static 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 270static 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 295out: 296 return err; 297} 298 299static 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; 322out: 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 */ 336static int 337xfrm_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 364static 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 */ 389static 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 403static 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 423static 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 447int 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) { 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 } 488 489 /* encap_type < -1 indicates a GRO call. */ 490 encap_type = 0; 491 seq = XFRM_SPI_SKB_CB(skb)->seq; 492 493 if (xo && (xo->flags & CRYPTO_DONE)) { 494 crypto_done = true; 495 family = XFRM_SPI_SKB_CB(skb)->family; 496 497 if (!(xo->status & CRYPTO_SUCCESS)) { 498 if (xo->status & 499 (CRYPTO_TRANSPORT_AH_AUTH_FAILED | 500 CRYPTO_TRANSPORT_ESP_AUTH_FAILED | 501 CRYPTO_TUNNEL_AH_AUTH_FAILED | 502 CRYPTO_TUNNEL_ESP_AUTH_FAILED)) { 503 504 xfrm_audit_state_icvfail(x, skb, 505 x->type->proto); 506 x->stats.integrity_failed++; 507 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); 508 goto drop; 509 } 510 511 if (xo->status & CRYPTO_INVALID_PROTOCOL) { 512 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); 513 goto drop; 514 } 515 516 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); 517 goto drop; 518 } 519 520 if (xfrm_parse_spi(skb, nexthdr, &spi, &seq)) { 521 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); 522 goto drop; 523 } 524 } 525 526 goto lock; 527 } 528 529 family = XFRM_SPI_SKB_CB(skb)->family; 530 531 /* if tunnel is present override skb->mark value with tunnel i_key */ 532 switch (family) { 533 case AF_INET: 534 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) 535 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key); 536 break; 537 case AF_INET6: 538 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) 539 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key); 540 break; 541 } 542 543 sp = secpath_set(skb); 544 if (!sp) { 545 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); 546 goto drop; 547 } 548 549 seq = 0; 550 if (!spi && xfrm_parse_spi(skb, nexthdr, &spi, &seq)) { 551 secpath_reset(skb); 552 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); 553 goto drop; 554 } 555 556 daddr = (xfrm_address_t *)(skb_network_header(skb) + 557 XFRM_SPI_SKB_CB(skb)->daddroff); 558 do { 559 sp = skb_sec_path(skb); 560 561 if (sp->len == XFRM_MAX_DEPTH) { 562 secpath_reset(skb); 563 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); 564 goto drop; 565 } 566 567 x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family); 568 if (x == NULL) { 569 secpath_reset(skb); 570 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); 571 xfrm_audit_state_notfound(skb, family, spi, seq); 572 goto drop; 573 } 574 575 skb->mark = xfrm_smark_get(skb->mark, x); 576 577 sp->xvec[sp->len++] = x; 578 579 skb_dst_force(skb); 580 if (!skb_dst(skb)) { 581 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); 582 goto drop; 583 } 584 585lock: 586 spin_lock(&x->lock); 587 588 if (unlikely(x->km.state != XFRM_STATE_VALID)) { 589 if (x->km.state == XFRM_STATE_ACQ) 590 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); 591 else 592 XFRM_INC_STATS(net, 593 LINUX_MIB_XFRMINSTATEINVALID); 594 goto drop_unlock; 595 } 596 597 if ((x->encap ? x->encap->encap_type : 0) != encap_type) { 598 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); 599 goto drop_unlock; 600 } 601 602 if (xfrm_replay_check(x, skb, seq)) { 603 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); 604 goto drop_unlock; 605 } 606 607 if (xfrm_state_check_expire(x)) { 608 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED); 609 goto drop_unlock; 610 } 611 612 spin_unlock(&x->lock); 613 614 if (xfrm_tunnel_check(skb, x, family)) { 615 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); 616 goto drop; 617 } 618 619 seq_hi = htonl(xfrm_replay_seqhi(x, seq)); 620 621 XFRM_SKB_CB(skb)->seq.input.low = seq; 622 XFRM_SKB_CB(skb)->seq.input.hi = seq_hi; 623 624 dev_hold(skb->dev); 625 626 if (crypto_done) 627 nexthdr = x->type_offload->input_tail(x, skb); 628 else 629 nexthdr = x->type->input(x, skb); 630 631 if (nexthdr == -EINPROGRESS) 632 return 0; 633resume: 634 dev_put(skb->dev); 635 636 spin_lock(&x->lock); 637 if (nexthdr < 0) { 638 if (nexthdr == -EBADMSG) { 639 xfrm_audit_state_icvfail(x, skb, 640 x->type->proto); 641 x->stats.integrity_failed++; 642 } 643 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); 644 goto drop_unlock; 645 } 646 647 /* only the first xfrm gets the encap type */ 648 encap_type = 0; 649 650 if (xfrm_replay_recheck(x, skb, seq)) { 651 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); 652 goto drop_unlock; 653 } 654 655 xfrm_replay_advance(x, seq); 656 657 x->curlft.bytes += skb->len; 658 x->curlft.packets++; 659 x->lastused = ktime_get_real_seconds(); 660 661 spin_unlock(&x->lock); 662 663 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr; 664 665 if (xfrm_inner_mode_input(x, skb)) { 666 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); 667 goto drop; 668 } 669 670 if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) { 671 decaps = 1; 672 break; 673 } 674 675 /* 676 * We need the inner address. However, we only get here for 677 * transport mode so the outer address is identical. 678 */ 679 daddr = &x->id.daddr; 680 family = x->props.family; 681 682 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq); 683 if (err < 0) { 684 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); 685 goto drop; 686 } 687 crypto_done = false; 688 } while (!err); 689 690 err = xfrm_rcv_cb(skb, family, x->type->proto, 0); 691 if (err) 692 goto drop; 693 694 nf_reset_ct(skb); 695 696 if (decaps) { 697 sp = skb_sec_path(skb); 698 if (sp) 699 sp->olen = 0; 700 if (skb_valid_dst(skb)) 701 skb_dst_drop(skb); 702 gro_cells_receive(&gro_cells, skb); 703 return 0; 704 } else { 705 xo = xfrm_offload(skb); 706 if (xo) 707 xfrm_gro = xo->flags & XFRM_GRO; 708 709 err = -EAFNOSUPPORT; 710 rcu_read_lock(); 711 afinfo = xfrm_state_afinfo_get_rcu(x->props.family); 712 if (likely(afinfo)) 713 err = afinfo->transport_finish(skb, xfrm_gro || async); 714 rcu_read_unlock(); 715 if (xfrm_gro) { 716 sp = skb_sec_path(skb); 717 if (sp) 718 sp->olen = 0; 719 if (skb_valid_dst(skb)) 720 skb_dst_drop(skb); 721 gro_cells_receive(&gro_cells, skb); 722 return err; 723 } 724 725 return err; 726 } 727 728drop_unlock: 729 spin_unlock(&x->lock); 730drop: 731 xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1); 732 kfree_skb(skb); 733 return 0; 734} 735EXPORT_SYMBOL(xfrm_input); 736 737int xfrm_input_resume(struct sk_buff *skb, int nexthdr) 738{ 739 return xfrm_input(skb, nexthdr, 0, -1); 740} 741EXPORT_SYMBOL(xfrm_input_resume); 742 743static void xfrm_trans_reinject(struct work_struct *work) 744{ 745 struct xfrm_trans_tasklet *trans = container_of(work, struct xfrm_trans_tasklet, work); 746 struct sk_buff_head queue; 747 struct sk_buff *skb; 748 749 __skb_queue_head_init(&queue); 750 spin_lock_bh(&trans->queue_lock); 751 skb_queue_splice_init(&trans->queue, &queue); 752 spin_unlock_bh(&trans->queue_lock); 753 754 local_bh_disable(); 755 while ((skb = __skb_dequeue(&queue))) 756 XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net, 757 NULL, skb); 758 local_bh_enable(); 759} 760 761int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, 762 int (*finish)(struct net *, struct sock *, 763 struct sk_buff *)) 764{ 765 struct xfrm_trans_tasklet *trans; 766 767 trans = this_cpu_ptr(&xfrm_trans_tasklet); 768 769 if (skb_queue_len(&trans->queue) >= READ_ONCE(netdev_max_backlog)) 770 return -ENOBUFS; 771 772 BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb)); 773 774 XFRM_TRANS_SKB_CB(skb)->finish = finish; 775 XFRM_TRANS_SKB_CB(skb)->net = net; 776 spin_lock_bh(&trans->queue_lock); 777 __skb_queue_tail(&trans->queue, skb); 778 spin_unlock_bh(&trans->queue_lock); 779 schedule_work(&trans->work); 780 return 0; 781} 782EXPORT_SYMBOL(xfrm_trans_queue_net); 783 784int xfrm_trans_queue(struct sk_buff *skb, 785 int (*finish)(struct net *, struct sock *, 786 struct sk_buff *)) 787{ 788 return xfrm_trans_queue_net(dev_net(skb->dev), skb, finish); 789} 790EXPORT_SYMBOL(xfrm_trans_queue); 791 792void __init xfrm_input_init(void) 793{ 794 int err; 795 int i; 796 797 init_dummy_netdev(&xfrm_napi_dev); 798 err = gro_cells_init(&gro_cells, &xfrm_napi_dev); 799 if (err) 800 gro_cells.cells = NULL; 801 802 for_each_possible_cpu(i) { 803 struct xfrm_trans_tasklet *trans; 804 805 trans = &per_cpu(xfrm_trans_tasklet, i); 806 spin_lock_init(&trans->queue_lock); 807 __skb_queue_head_init(&trans->queue); 808 INIT_WORK(&trans->work, xfrm_trans_reinject); 809 } 810} 811