net/ipv6/netfilter/nf_conntrack_reasm.c

   1 /*
   2  * IPv6 fragment reassembly for connection tracking
   3  *
   4  * Copyright (C)2004 USAGI/WIDE Project
   5  *
   6  * Author:
   7  *      Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
   8  *
   9  * Based on: net/ipv6/reassembly.c
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version
  14  * 2 of the License, or (at your option) any later version.
  15  */
  16
  17 #define pr_fmt(fmt) "IPv6-nf: " fmt
  18
  19 #include <linux/errno.h>
  20 #include <linux/types.h>
  21 #include <linux/string.h>
  22 #include <linux/socket.h>
  23 #include <linux/sockios.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/net.h>
  26 #include <linux/list.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/in6.h>
  29 #include <linux/ipv6.h>
  30 #include <linux/icmpv6.h>
  31 #include <linux/random.h>
  32 #include <linux/slab.h>
  33
  34 #include <net/sock.h>
  35 #include <net/snmp.h>
  36 #include <net/inet_frag.h>
  37
  38 #include <net/ipv6.h>
  39 #include <net/protocol.h>
  40 #include <net/transp_v6.h>
  41 #include <net/rawv6.h>
  42 #include <net/ndisc.h>
  43 #include <net/addrconf.h>
  44 #include <net/inet_ecn.h>
  45 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
  46 #include <linux/sysctl.h>
  47 #include <linux/netfilter.h>
  48 #include <linux/netfilter_ipv6.h>
  49 #include <linux/kernel.h>
  50 #include <linux/module.h>
  51 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
  52
  53
  54 struct nf_ct_frag6_skb_cb
  55 {
  56         struct inet6_skb_parm   h;
  57         int                     offset;
  58         struct sk_buff          *orig;
  59 };
  60
  61 #define NFCT_FRAG6_CB(skb)      ((struct nf_ct_frag6_skb_cb*)((skb)->cb))
  62
  63 static struct inet_frags nf_frags;
  64
  65 #ifdef CONFIG_SYSCTL
  66 static int zero;
  67
  68 static struct ctl_table nf_ct_frag6_sysctl_table[] = {
  69         {
  70                 .procname       = "nf_conntrack_frag6_timeout",
  71                 .data           = &init_net.nf_frag.frags.timeout,
  72                 .maxlen         = sizeof(unsigned int),
  73                 .mode           = 0644,
  74                 .proc_handler   = proc_dointvec_jiffies,
  75         },
  76         {
  77                 .procname       = "nf_conntrack_frag6_low_thresh",
  78                 .data           = &init_net.nf_frag.frags.low_thresh,
  79                 .maxlen         = sizeof(unsigned int),
  80                 .mode           = 0644,
  81                 .proc_handler   = proc_dointvec_minmax,
  82                 .extra1         = &zero,
  83                 .extra2         = &init_net.nf_frag.frags.high_thresh
  84         },
  85         {
  86                 .procname       = "nf_conntrack_frag6_high_thresh",
  87                 .data           = &init_net.nf_frag.frags.high_thresh,
  88                 .maxlen         = sizeof(unsigned int),
  89                 .mode           = 0644,
  90                 .proc_handler   = proc_dointvec_minmax,
  91                 .extra1         = &init_net.nf_frag.frags.low_thresh
  92         },
  93         { }
  94 };
  95
  96 static int nf_ct_frag6_sysctl_register(struct net *net)
  97 {
  98         struct ctl_table *table;
  99         struct ctl_table_header *hdr;
 100
 101         table = nf_ct_frag6_sysctl_table;
 102         if (!net_eq(net, &init_net)) {
 103                 table = kmemdup(table, sizeof(nf_ct_frag6_sysctl_table),
 104                                 GFP_KERNEL);
 105                 if (table == NULL)
 106                         goto err_alloc;
 107
 108                 table[0].data = &net->nf_frag.frags.timeout;
 109                 table[1].data = &net->nf_frag.frags.low_thresh;
 110                 table[1].extra2 = &net->nf_frag.frags.high_thresh;
 111                 table[2].data = &net->nf_frag.frags.high_thresh;
 112                 table[2].extra1 = &net->nf_frag.frags.low_thresh;
 113                 table[2].extra2 = &init_net.nf_frag.frags.high_thresh;
 114         }
 115
 116         hdr = register_net_sysctl(net, "net/netfilter", table);
 117         if (hdr == NULL)
 118                 goto err_reg;
 119
 120         net->nf_frag.sysctl.frags_hdr = hdr;
 121         return 0;
 122
 123 err_reg:
 124         if (!net_eq(net, &init_net))
 125                 kfree(table);
 126 err_alloc:
 127         return -ENOMEM;
 128 }
 129
 130 static void __net_exit nf_ct_frags6_sysctl_unregister(struct net *net)
 131 {
 132         struct ctl_table *table;
 133
 134         table = net->nf_frag.sysctl.frags_hdr->ctl_table_arg;
 135         unregister_net_sysctl_table(net->nf_frag.sysctl.frags_hdr);
 136         if (!net_eq(net, &init_net))
 137                 kfree(table);
 138 }
 139
 140 #else
 141 static int nf_ct_frag6_sysctl_register(struct net *net)
 142 {
 143         return 0;
 144 }
 145 static void __net_exit nf_ct_frags6_sysctl_unregister(struct net *net)
 146 {
 147 }
 148 #endif
 149
 150 static inline u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h)
 151 {
 152         return 1 << (ipv6_get_dsfield(ipv6h) & INET_ECN_MASK);
 153 }
 154
 155 static unsigned int nf_hash_frag(__be32 id, const struct in6_addr *saddr,
 156                                  const struct in6_addr *daddr)
 157 {
 158         net_get_random_once(&nf_frags.rnd, sizeof(nf_frags.rnd));
 159         return jhash_3words(ipv6_addr_hash(saddr), ipv6_addr_hash(daddr),
 160                             (__force u32)id, nf_frags.rnd);
 161 }
 162
 163
 164 static unsigned int nf_hashfn(const struct inet_frag_queue *q)
 165 {
 166         const struct frag_queue *nq;
 167
 168         nq = container_of(q, struct frag_queue, q);
 169         return nf_hash_frag(nq->id, &nq->saddr, &nq->daddr);
 170 }
 171
 172 static void nf_skb_free(struct sk_buff *skb)
 173 {
 174         if (NFCT_FRAG6_CB(skb)->orig)
 175                 kfree_skb(NFCT_FRAG6_CB(skb)->orig);
 176 }
 177
 178 static void nf_ct_frag6_expire(unsigned long data)
 179 {
 180         struct frag_queue *fq;
 181         struct net *net;
 182
 183         fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
 184         net = container_of(fq->q.net, struct net, nf_frag.frags);
 185
 186         ip6_expire_frag_queue(net, fq, &nf_frags);
 187 }
 188
 189 /* Creation primitives. */
 190 static inline struct frag_queue *fq_find(struct net *net, __be32 id,
 191                                          u32 user, struct in6_addr *src,
 192                                          struct in6_addr *dst, u8 ecn)
 193 {
 194         struct inet_frag_queue *q;
 195         struct ip6_create_arg arg;
 196         unsigned int hash;
 197
 198         arg.id = id;
 199         arg.user = user;
 200         arg.src = src;
 201         arg.dst = dst;
 202         arg.ecn = ecn;
 203
 204         local_bh_disable();
 205         hash = nf_hash_frag(id, src, dst);
 206
 207         q = inet_frag_find(&net->nf_frag.frags, &nf_frags, &arg, hash);
 208         local_bh_enable();
 209         if (IS_ERR_OR_NULL(q)) {
 210                 inet_frag_maybe_warn_overflow(q, pr_fmt());
 211                 return NULL;
 212         }
 213         return container_of(q, struct frag_queue, q);
 214 }
 215
 216
 217 static int nf_ct_frag6_queue(struct frag_queue *fq, struct sk_buff *skb,
 218                              const struct frag_hdr *fhdr, int nhoff)
 219 {
 220         struct sk_buff *prev, *next;
 221         unsigned int payload_len;
 222         int offset, end;
 223         u8 ecn;
 224
 225         if (fq->q.last_in & INET_FRAG_COMPLETE) {
 226                 pr_debug("Already completed\n");
 227                 goto err;
 228         }
 229
 230         payload_len = ntohs(ipv6_hdr(skb)->payload_len);
 231
 232         offset = ntohs(fhdr->frag_off) & ~0x7;
 233         end = offset + (payload_len -
 234                         ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
 235
 236         if ((unsigned int)end > IPV6_MAXPLEN) {
 237                 pr_debug("offset is too large.\n");
 238                 return -1;
 239         }
 240
 241         ecn = ip6_frag_ecn(ipv6_hdr(skb));
 242
 243         if (skb->ip_summed == CHECKSUM_COMPLETE) {
 244                 const unsigned char *nh = skb_network_header(skb);
 245                 skb->csum = csum_sub(skb->csum,
 246                                      csum_partial(nh, (u8 *)(fhdr + 1) - nh,
 247                                                   0));
 248         }
 249
 250         /* Is this the final fragment? */
 251         if (!(fhdr->frag_off & htons(IP6_MF))) {
 252                 /* If we already have some bits beyond end
 253                  * or have different end, the segment is corrupted.
 254                  */
 255                 if (end < fq->q.len ||
 256                     ((fq->q.last_in & INET_FRAG_LAST_IN) && end != fq->q.len)) {
 257                         pr_debug("already received last fragment\n");
 258                         goto err;
 259                 }
 260                 fq->q.last_in |= INET_FRAG_LAST_IN;
 261                 fq->q.len = end;
 262         } else {
 263                 /* Check if the fragment is rounded to 8 bytes.
 264                  * Required by the RFC.
 265                  */
 266                 if (end & 0x7) {
 267                         /* RFC2460 says always send parameter problem in
 268                          * this case. -DaveM
 269                          */
 270                         pr_debug("end of fragment not rounded to 8 bytes.\n");
 271                         return -1;
 272                 }
 273                 if (end > fq->q.len) {
 274                         /* Some bits beyond end -> corruption. */
 275                         if (fq->q.last_in & INET_FRAG_LAST_IN) {
 276                                 pr_debug("last packet already reached.\n");
 277                                 goto err;
 278                         }
 279                         fq->q.len = end;
 280                 }
 281         }
 282
 283         if (end == offset)
 284                 goto err;
 285
 286         /* Point into the IP datagram 'data' part. */
 287         if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data)) {
 288                 pr_debug("queue: message is too short.\n");
 289                 goto err;
 290         }
 291         if (pskb_trim_rcsum(skb, end - offset)) {
 292                 pr_debug("Can't trim\n");
 293                 goto err;
 294         }
 295
 296         /* Find out which fragments are in front and at the back of us
 297          * in the chain of fragments so far.  We must know where to put
 298          * this fragment, right?
 299          */
 300         prev = fq->q.fragments_tail;
 301         if (!prev || NFCT_FRAG6_CB(prev)->offset < offset) {
 302                 next = NULL;
 303                 goto found;
 304         }
 305         prev = NULL;
 306         for (next = fq->q.fragments; next != NULL; next = next->next) {
 307                 if (NFCT_FRAG6_CB(next)->offset >= offset)
 308                         break;  /* bingo! */
 309                 prev = next;
 310         }
 311
 312 found:
 313         /* RFC5722, Section 4:
 314          *                                  When reassembling an IPv6 datagram, if
 315          *   one or more its constituent fragments is determined to be an
 316          *   overlapping fragment, the entire datagram (and any constituent
 317          *   fragments, including those not yet received) MUST be silently
 318          *   discarded.
 319          */
 320
 321         /* Check for overlap with preceding fragment. */
 322         if (prev &&
 323             (NFCT_FRAG6_CB(prev)->offset + prev->len) > offset)
 324                 goto discard_fq;
 325
 326         /* Look for overlap with succeeding segment. */
 327         if (next && NFCT_FRAG6_CB(next)->offset < end)
 328                 goto discard_fq;
 329
 330         NFCT_FRAG6_CB(skb)->offset = offset;
 331
 332         /* Insert this fragment in the chain of fragments. */
 333         skb->next = next;
 334         if (!next)
 335                 fq->q.fragments_tail = skb;
 336         if (prev)
 337                 prev->next = skb;
 338         else
 339                 fq->q.fragments = skb;
 340
 341         if (skb->dev) {
 342                 fq->iif = skb->dev->ifindex;
 343                 skb->dev = NULL;
 344         }
 345         fq->q.stamp = skb->tstamp;
 346         fq->q.meat += skb->len;
 347         fq->ecn |= ecn;
 348         if (payload_len > fq->q.max_size)
 349                 fq->q.max_size = payload_len;
 350         add_frag_mem_limit(&fq->q, skb->truesize);
 351
 352         /* The first fragment.
 353          * nhoffset is obtained from the first fragment, of course.
 354          */
 355         if (offset == 0) {
 356                 fq->nhoffset = nhoff;
 357                 fq->q.last_in |= INET_FRAG_FIRST_IN;
 358         }
 359
 360         return 0;
 361
 362 discard_fq:
 363         inet_frag_kill(&fq->q, &nf_frags);
 364 err:
 365         return -1;
 366 }
 367
 368 /*
 369  *      Check if this packet is complete.
 370  *      Returns NULL on failure by any reason, and pointer
 371  *      to current nexthdr field in reassembled frame.
 372  *
 373  *      It is called with locked fq, and caller must check that
 374  *      queue is eligible for reassembly i.e. it is not COMPLETE,
 375  *      the last and the first frames arrived and all the bits are here.
 376  */
 377 static struct sk_buff *
 378 nf_ct_frag6_reasm(struct frag_queue *fq, struct net_device *dev)
 379 {
 380         struct sk_buff *fp, *op, *head = fq->q.fragments;
 381         int    payload_len;
 382         u8 ecn;
 383
 384         inet_frag_kill(&fq->q, &nf_frags);
 385
 386         WARN_ON(head == NULL);
 387         WARN_ON(NFCT_FRAG6_CB(head)->offset != 0);
 388
 389         ecn = ip_frag_ecn_table[fq->ecn];
 390         if (unlikely(ecn == 0xff))
 391                 goto out_fail;
 392
 393         /* Unfragmented part is taken from the first segment. */
 394         payload_len = ((head->data - skb_network_header(head)) -
 395                        sizeof(struct ipv6hdr) + fq->q.len -
 396                        sizeof(struct frag_hdr));
 397         if (payload_len > IPV6_MAXPLEN) {
 398                 pr_debug("payload len is too large.\n");
 399                 goto out_oversize;
 400         }
 401
 402         /* Head of list must not be cloned. */
 403         if (skb_unclone(head, GFP_ATOMIC)) {
 404                 pr_debug("skb is cloned but can't expand head");
 405                 goto out_oom;
 406         }
 407
 408         /* If the first fragment is fragmented itself, we split
 409          * it to two chunks: the first with data and paged part
 410          * and the second, holding only fragments. */
 411         if (skb_has_frag_list(head)) {
 412                 struct sk_buff *clone;
 413                 int i, plen = 0;
 414
 415                 clone = alloc_skb(0, GFP_ATOMIC);
 416                 if (clone == NULL)
 417                         goto out_oom;
 418
 419                 clone->next = head->next;
 420                 head->next = clone;
 421                 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
 422                 skb_frag_list_init(head);
 423                 for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
 424                         plen += skb_frag_size(&skb_shinfo(head)->frags[i]);
 425                 clone->len = clone->data_len = head->data_len - plen;
 426                 head->data_len -= clone->len;
 427                 head->len -= clone->len;
 428                 clone->csum = 0;
 429                 clone->ip_summed = head->ip_summed;
 430
 431                 NFCT_FRAG6_CB(clone)->orig = NULL;
 432                 add_frag_mem_limit(&fq->q, clone->truesize);
 433         }
 434
 435         /* We have to remove fragment header from datagram and to relocate
 436          * header in order to calculate ICV correctly. */
 437         skb_network_header(head)[fq->nhoffset] = skb_transport_header(head)[0];
 438         memmove(head->head + sizeof(struct frag_hdr), head->head,
 439                 (head->data - head->head) - sizeof(struct frag_hdr));
 440         head->mac_header += sizeof(struct frag_hdr);
 441         head->network_header += sizeof(struct frag_hdr);
 442
 443         skb_shinfo(head)->frag_list = head->next;
 444         skb_reset_transport_header(head);
 445         skb_push(head, head->data - skb_network_header(head));
 446
 447         for (fp=head->next; fp; fp = fp->next) {
 448                 head->data_len += fp->len;
 449                 head->len += fp->len;
 450                 if (head->ip_summed != fp->ip_summed)
 451                         head->ip_summed = CHECKSUM_NONE;
 452                 else if (head->ip_summed == CHECKSUM_COMPLETE)
 453                         head->csum = csum_add(head->csum, fp->csum);
 454                 head->truesize += fp->truesize;
 455         }
 456         sub_frag_mem_limit(&fq->q, head->truesize);
 457
 458         head->ignore_df = 1;
 459         head->next = NULL;
 460         head->dev = dev;
 461         head->tstamp = fq->q.stamp;
 462         ipv6_hdr(head)->payload_len = htons(payload_len);
 463         ipv6_change_dsfield(ipv6_hdr(head), 0xff, ecn);
 464         IP6CB(head)->frag_max_size = sizeof(struct ipv6hdr) + fq->q.max_size;
 465
 466         /* Yes, and fold redundant checksum back. 8) */
 467         if (head->ip_summed == CHECKSUM_COMPLETE)
 468                 head->csum = csum_partial(skb_network_header(head),
 469                                           skb_network_header_len(head),
 470                                           head->csum);
 471
 472         fq->q.fragments = NULL;
 473         fq->q.fragments_tail = NULL;
 474
 475         /* all original skbs are linked into the NFCT_FRAG6_CB(head).orig */
 476         fp = skb_shinfo(head)->frag_list;
 477         if (fp && NFCT_FRAG6_CB(fp)->orig == NULL)
 478                 /* at above code, head skb is divided into two skbs. */
 479                 fp = fp->next;
 480
 481         op = NFCT_FRAG6_CB(head)->orig;
 482         for (; fp; fp = fp->next) {
 483                 struct sk_buff *orig = NFCT_FRAG6_CB(fp)->orig;
 484
 485                 op->next = orig;
 486                 op = orig;
 487                 NFCT_FRAG6_CB(fp)->orig = NULL;
 488         }
 489
 490         return head;
 491
 492 out_oversize:
 493         net_dbg_ratelimited("nf_ct_frag6_reasm: payload len = %d\n",
 494                             payload_len);
 495         goto out_fail;
 496 out_oom:
 497         net_dbg_ratelimited("nf_ct_frag6_reasm: no memory for reassembly\n");
 498 out_fail:
 499         return NULL;
 500 }
 501
 502 /*
 503  * find the header just before Fragment Header.
 504  *
 505  * if success return 0 and set ...
 506  * (*prevhdrp): the value of "Next Header Field" in the header
 507  *              just before Fragment Header.
 508  * (*prevhoff): the offset of "Next Header Field" in the header
 509  *              just before Fragment Header.
 510  * (*fhoff)   : the offset of Fragment Header.
 511  *
 512  * Based on ipv6_skip_hdr() in net/ipv6/exthdr.c
 513  *
 514  */
 515 static int
 516 find_prev_fhdr(struct sk_buff *skb, u8 *prevhdrp, int *prevhoff, int *fhoff)
 517 {
 518         u8 nexthdr = ipv6_hdr(skb)->nexthdr;
 519         const int netoff = skb_network_offset(skb);
 520         u8 prev_nhoff = netoff + offsetof(struct ipv6hdr, nexthdr);
 521         int start = netoff + sizeof(struct ipv6hdr);
 522         int len = skb->len - start;
 523         u8 prevhdr = NEXTHDR_IPV6;
 524
 525         while (nexthdr != NEXTHDR_FRAGMENT) {
 526                 struct ipv6_opt_hdr hdr;
 527                 int hdrlen;
 528
 529                 if (!ipv6_ext_hdr(nexthdr)) {
 530                         return -1;
 531                 }
 532                 if (nexthdr == NEXTHDR_NONE) {
 533                         pr_debug("next header is none\n");
 534                         return -1;
 535                 }
 536                 if (len < (int)sizeof(struct ipv6_opt_hdr)) {
 537                         pr_debug("too short\n");
 538                         return -1;
 539                 }
 540                 if (skb_copy_bits(skb, start, &hdr, sizeof(hdr)))
 541                         BUG();
 542                 if (nexthdr == NEXTHDR_AUTH)
 543                         hdrlen = (hdr.hdrlen+2)<<2;
 544                 else
 545                         hdrlen = ipv6_optlen(&hdr);
 546
 547                 prevhdr = nexthdr;
 548                 prev_nhoff = start;
 549
 550                 nexthdr = hdr.nexthdr;
 551                 len -= hdrlen;
 552                 start += hdrlen;
 553         }
 554
 555         if (len < 0)
 556                 return -1;
 557
 558         *prevhdrp = prevhdr;
 559         *prevhoff = prev_nhoff;
 560         *fhoff = start;
 561
 562         return 0;
 563 }
 564
 565 struct sk_buff *nf_ct_frag6_gather(struct sk_buff *skb, u32 user)
 566 {
 567         struct sk_buff *clone;
 568         struct net_device *dev = skb->dev;
 569         struct net *net = skb_dst(skb) ? dev_net(skb_dst(skb)->dev)
 570                                        : dev_net(skb->dev);
 571         struct frag_hdr *fhdr;
 572         struct frag_queue *fq;
 573         struct ipv6hdr *hdr;
 574         int fhoff, nhoff;
 575         u8 prevhdr;
 576         struct sk_buff *ret_skb = NULL;
 577
 578         /* Jumbo payload inhibits frag. header */
 579         if (ipv6_hdr(skb)->payload_len == 0) {
 580                 pr_debug("payload len = 0\n");
 581                 return skb;
 582         }
 583
 584         if (find_prev_fhdr(skb, &prevhdr, &nhoff, &fhoff) < 0)
 585                 return skb;
 586
 587         clone = skb_clone(skb, GFP_ATOMIC);
 588         if (clone == NULL) {
 589                 pr_debug("Can't clone skb\n");
 590                 return skb;
 591         }
 592
 593         NFCT_FRAG6_CB(clone)->orig = skb;
 594
 595         if (!pskb_may_pull(clone, fhoff + sizeof(*fhdr))) {
 596                 pr_debug("message is too short.\n");
 597                 goto ret_orig;
 598         }
 599
 600         skb_set_transport_header(clone, fhoff);
 601         hdr = ipv6_hdr(clone);
 602         fhdr = (struct frag_hdr *)skb_transport_header(clone);
 603
 604         fq = fq_find(net, fhdr->identification, user, &hdr->saddr, &hdr->daddr,
 605                      ip6_frag_ecn(hdr));
 606         if (fq == NULL) {
 607                 pr_debug("Can't find and can't create new queue\n");
 608                 goto ret_orig;
 609         }
 610
 611         spin_lock_bh(&fq->q.lock);
 612
 613         if (nf_ct_frag6_queue(fq, clone, fhdr, nhoff) < 0) {
 614                 spin_unlock_bh(&fq->q.lock);
 615                 pr_debug("Can't insert skb to queue\n");
 616                 inet_frag_put(&fq->q, &nf_frags);
 617                 goto ret_orig;
 618         }
 619
 620         if (fq->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
 621             fq->q.meat == fq->q.len) {
 622                 ret_skb = nf_ct_frag6_reasm(fq, dev);
 623                 if (ret_skb == NULL)
 624                         pr_debug("Can't reassemble fragmented packets\n");
 625         }
 626         spin_unlock_bh(&fq->q.lock);
 627
 628         inet_frag_put(&fq->q, &nf_frags);
 629         return ret_skb;
 630
 631 ret_orig:
 632         kfree_skb(clone);
 633         return skb;
 634 }
 635
 636 void nf_ct_frag6_consume_orig(struct sk_buff *skb)
 637 {
 638         struct sk_buff *s, *s2;
 639
 640         for (s = NFCT_FRAG6_CB(skb)->orig; s;) {
 641                 s2 = s->next;
 642                 s->next = NULL;
 643                 consume_skb(s);
 644                 s = s2;
 645         }
 646 }
 647
 648 static int nf_ct_net_init(struct net *net)
 649 {
 650         net->nf_frag.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
 651         net->nf_frag.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
 652         net->nf_frag.frags.timeout = IPV6_FRAG_TIMEOUT;
 653         inet_frags_init_net(&net->nf_frag.frags);
 654
 655         return nf_ct_frag6_sysctl_register(net);
 656 }
 657
 658 static void nf_ct_net_exit(struct net *net)
 659 {
 660         nf_ct_frags6_sysctl_unregister(net);
 661         inet_frags_exit_net(&net->nf_frag.frags, &nf_frags);
 662 }
 663
 664 static struct pernet_operations nf_ct_net_ops = {
 665         .init = nf_ct_net_init,
 666         .exit = nf_ct_net_exit,
 667 };
 668
 669 int nf_ct_frag6_init(void)
 670 {
 671         int ret = 0;
 672
 673         nf_frags.hashfn = nf_hashfn;
 674         nf_frags.constructor = ip6_frag_init;
 675         nf_frags.destructor = NULL;
 676         nf_frags.skb_free = nf_skb_free;
 677         nf_frags.qsize = sizeof(struct frag_queue);
 678         nf_frags.match = ip6_frag_match;
 679         nf_frags.frag_expire = nf_ct_frag6_expire;
 680         inet_frags_init(&nf_frags);
 681
 682         ret = register_pernet_subsys(&nf_ct_net_ops);
 683         if (ret)
 684                 inet_frags_fini(&nf_frags);
 685
 686         return ret;
 687 }
 688
 689 void nf_ct_frag6_cleanup(void)
 690 {
 691         unregister_pernet_subsys(&nf_ct_net_ops);
 692         inet_frags_fini(&nf_frags);
 693 }