net/xfrm/xfrm_input.c

   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) {
 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
 585 lock:
 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;
 633 resume:
 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
 728 drop_unlock:
 729         spin_unlock(&x->lock);
 730 drop:
 731         xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
 732         kfree_skb(skb);
 733         return 0;
 734 }
 735 EXPORT_SYMBOL(xfrm_input);
 736
 737 int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
 738 {
 739         return xfrm_input(skb, nexthdr, 0, -1);
 740 }
 741 EXPORT_SYMBOL(xfrm_input_resume);
 742
 743 static 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
 761 int 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 }
 782 EXPORT_SYMBOL(xfrm_trans_queue_net);
 783
 784 int 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 }
 790 EXPORT_SYMBOL(xfrm_trans_queue);
 791
 792 void __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 }