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 #include <linux/errno.h>
  18 #include <linux/types.h>
  19 #include <linux/string.h>
  20 #include <linux/socket.h>
  21 #include <linux/sockios.h>
  22 #include <linux/jiffies.h>
  23 #include <linux/net.h>
  24 #include <linux/list.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/in6.h>
  27 #include <linux/ipv6.h>
  28 #include <linux/icmpv6.h>
  29 #include <linux/random.h>
  30 #include <linux/slab.h>
  31
  32 #include <net/sock.h>
  33 #include <net/snmp.h>
  34 #include <net/inet_frag.h>
  35
  36 #include <net/ipv6.h>
  37 #include <net/protocol.h>
  38 #include <net/transp_v6.h>
  39 #include <net/rawv6.h>
  40 #include <net/ndisc.h>
  41 #include <net/addrconf.h>
  42 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
  43 #include <linux/sysctl.h>
  44 #include <linux/netfilter.h>
  45 #include <linux/netfilter_ipv6.h>
  46 #include <linux/kernel.h>
  47 #include <linux/module.h>
  48
  49
  50 struct nf_ct_frag6_skb_cb
  51 {
  52         struct inet6_skb_parm   h;
  53         int                     offset;
  54         struct sk_buff          *orig;
  55 };
  56
  57 #define NFCT_FRAG6_CB(skb)      ((struct nf_ct_frag6_skb_cb*)((skb)->cb))
  58
  59 struct nf_ct_frag6_queue
  60 {
  61         struct inet_frag_queue  q;
  62
  63         __be32                  id;             /* fragment id          */
  64         u32                     user;
  65         struct in6_addr         saddr;
  66         struct in6_addr         daddr;
  67
  68         unsigned int            csum;
  69         __u16                   nhoffset;
  70 };
  71
  72 static struct inet_frags nf_frags;
  73 static struct netns_frags nf_init_frags;
  74
  75 #ifdef CONFIG_SYSCTL
  76 struct ctl_table nf_ct_ipv6_sysctl_table[] = {
  77         {
  78                 .procname       = "nf_conntrack_frag6_timeout",
  79                 .data           = &nf_init_frags.timeout,
  80                 .maxlen         = sizeof(unsigned int),
  81                 .mode           = 0644,
  82                 .proc_handler   = proc_dointvec_jiffies,
  83         },
  84         {
  85                 .procname       = "nf_conntrack_frag6_low_thresh",
  86                 .data           = &nf_init_frags.low_thresh,
  87                 .maxlen         = sizeof(unsigned int),
  88                 .mode           = 0644,
  89                 .proc_handler   = proc_dointvec,
  90         },
  91         {
  92                 .procname       = "nf_conntrack_frag6_high_thresh",
  93                 .data           = &nf_init_frags.high_thresh,
  94                 .maxlen         = sizeof(unsigned int),
  95                 .mode           = 0644,
  96                 .proc_handler   = proc_dointvec,
  97         },
  98         { }
  99 };
 100 #endif
 101
 102 static unsigned int nf_hashfn(struct inet_frag_queue *q)
 103 {
 104         const struct nf_ct_frag6_queue *nq;
 105
 106         nq = container_of(q, struct nf_ct_frag6_queue, q);
 107         return inet6_hash_frag(nq->id, &nq->saddr, &nq->daddr, nf_frags.rnd);
 108 }
 109
 110 static void nf_skb_free(struct sk_buff *skb)
 111 {
 112         if (NFCT_FRAG6_CB(skb)->orig)
 113                 kfree_skb(NFCT_FRAG6_CB(skb)->orig);
 114 }
 115
 116 /* Memory Tracking Functions. */
 117 static void frag_kfree_skb(struct sk_buff *skb)
 118 {
 119         atomic_sub(skb->truesize, &nf_init_frags.mem);
 120         nf_skb_free(skb);
 121         kfree_skb(skb);
 122 }
 123
 124 /* Destruction primitives. */
 125
 126 static __inline__ void fq_put(struct nf_ct_frag6_queue *fq)
 127 {
 128         inet_frag_put(&fq->q, &nf_frags);
 129 }
 130
 131 /* Kill fq entry. It is not destroyed immediately,
 132  * because caller (and someone more) holds reference count.
 133  */
 134 static __inline__ void fq_kill(struct nf_ct_frag6_queue *fq)
 135 {
 136         inet_frag_kill(&fq->q, &nf_frags);
 137 }
 138
 139 static void nf_ct_frag6_evictor(void)
 140 {
 141         local_bh_disable();
 142         inet_frag_evictor(&nf_init_frags, &nf_frags);
 143         local_bh_enable();
 144 }
 145
 146 static void nf_ct_frag6_expire(unsigned long data)
 147 {
 148         struct nf_ct_frag6_queue *fq;
 149
 150         fq = container_of((struct inet_frag_queue *)data,
 151                         struct nf_ct_frag6_queue, q);
 152
 153         spin_lock(&fq->q.lock);
 154
 155         if (fq->q.last_in & INET_FRAG_COMPLETE)
 156                 goto out;
 157
 158         fq_kill(fq);
 159
 160 out:
 161         spin_unlock(&fq->q.lock);
 162         fq_put(fq);
 163 }
 164
 165 /* Creation primitives. */
 166
 167 static __inline__ struct nf_ct_frag6_queue *
 168 fq_find(__be32 id, u32 user, struct in6_addr *src, struct in6_addr *dst)
 169 {
 170         struct inet_frag_queue *q;
 171         struct ip6_create_arg arg;
 172         unsigned int hash;
 173
 174         arg.id = id;
 175         arg.user = user;
 176         arg.src = src;
 177         arg.dst = dst;
 178
 179         read_lock_bh(&nf_frags.lock);
 180         hash = inet6_hash_frag(id, src, dst, nf_frags.rnd);
 181
 182         q = inet_frag_find(&nf_init_frags, &nf_frags, &arg, hash);
 183         local_bh_enable();
 184         if (q == NULL)
 185                 goto oom;
 186
 187         return container_of(q, struct nf_ct_frag6_queue, q);
 188
 189 oom:
 190         pr_debug("Can't alloc new queue\n");
 191         return NULL;
 192 }
 193
 194
 195 static int nf_ct_frag6_queue(struct nf_ct_frag6_queue *fq, struct sk_buff *skb,
 196                              const struct frag_hdr *fhdr, int nhoff)
 197 {
 198         struct sk_buff *prev, *next;
 199         int offset, end;
 200
 201         if (fq->q.last_in & INET_FRAG_COMPLETE) {
 202                 pr_debug("Already completed\n");
 203                 goto err;
 204         }
 205
 206         offset = ntohs(fhdr->frag_off) & ~0x7;
 207         end = offset + (ntohs(ipv6_hdr(skb)->payload_len) -
 208                         ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
 209
 210         if ((unsigned int)end > IPV6_MAXPLEN) {
 211                 pr_debug("offset is too large.\n");
 212                 return -1;
 213         }
 214
 215         if (skb->ip_summed == CHECKSUM_COMPLETE) {
 216                 const unsigned char *nh = skb_network_header(skb);
 217                 skb->csum = csum_sub(skb->csum,
 218                                      csum_partial(nh, (u8 *)(fhdr + 1) - nh,
 219                                                   0));
 220         }
 221
 222         /* Is this the final fragment? */
 223         if (!(fhdr->frag_off & htons(IP6_MF))) {
 224                 /* If we already have some bits beyond end
 225                  * or have different end, the segment is corrupted.
 226                  */
 227                 if (end < fq->q.len ||
 228                     ((fq->q.last_in & INET_FRAG_LAST_IN) && end != fq->q.len)) {
 229                         pr_debug("already received last fragment\n");
 230                         goto err;
 231                 }
 232                 fq->q.last_in |= INET_FRAG_LAST_IN;
 233                 fq->q.len = end;
 234         } else {
 235                 /* Check if the fragment is rounded to 8 bytes.
 236                  * Required by the RFC.
 237                  */
 238                 if (end & 0x7) {
 239                         /* RFC2460 says always send parameter problem in
 240                          * this case. -DaveM
 241                          */
 242                         pr_debug("end of fragment not rounded to 8 bytes.\n");
 243                         return -1;
 244                 }
 245                 if (end > fq->q.len) {
 246                         /* Some bits beyond end -> corruption. */
 247                         if (fq->q.last_in & INET_FRAG_LAST_IN) {
 248                                 pr_debug("last packet already reached.\n");
 249                                 goto err;
 250                         }
 251                         fq->q.len = end;
 252                 }
 253         }
 254
 255         if (end == offset)
 256                 goto err;
 257
 258         /* Point into the IP datagram 'data' part. */
 259         if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data)) {
 260                 pr_debug("queue: message is too short.\n");
 261                 goto err;
 262         }
 263         if (pskb_trim_rcsum(skb, end - offset)) {
 264                 pr_debug("Can't trim\n");
 265                 goto err;
 266         }
 267
 268         /* Find out which fragments are in front and at the back of us
 269          * in the chain of fragments so far.  We must know where to put
 270          * this fragment, right?
 271          */
 272         prev = fq->q.fragments_tail;
 273         if (!prev || NFCT_FRAG6_CB(prev)->offset < offset) {
 274                 next = NULL;
 275                 goto found;
 276         }
 277         prev = NULL;
 278         for (next = fq->q.fragments; next != NULL; next = next->next) {
 279                 if (NFCT_FRAG6_CB(next)->offset >= offset)
 280                         break;  /* bingo! */
 281                 prev = next;
 282         }
 283
 284 found:
 285         /* We found where to put this one.  Check for overlap with
 286          * preceding fragment, and, if needed, align things so that
 287          * any overlaps are eliminated.
 288          */
 289         if (prev) {
 290                 int i = (NFCT_FRAG6_CB(prev)->offset + prev->len) - offset;
 291
 292                 if (i > 0) {
 293                         offset += i;
 294                         if (end <= offset) {
 295                                 pr_debug("overlap\n");
 296                                 goto err;
 297                         }
 298                         if (!pskb_pull(skb, i)) {
 299                                 pr_debug("Can't pull\n");
 300                                 goto err;
 301                         }
 302                         if (skb->ip_summed != CHECKSUM_UNNECESSARY)
 303                                 skb->ip_summed = CHECKSUM_NONE;
 304                 }
 305         }
 306
 307         /* Look for overlap with succeeding segments.
 308          * If we can merge fragments, do it.
 309          */
 310         while (next && NFCT_FRAG6_CB(next)->offset < end) {
 311                 /* overlap is 'i' bytes */
 312                 int i = end - NFCT_FRAG6_CB(next)->offset;
 313
 314                 if (i < next->len) {
 315                         /* Eat head of the next overlapped fragment
 316                          * and leave the loop. The next ones cannot overlap.
 317                          */
 318                         pr_debug("Eat head of the overlapped parts.: %d", i);
 319                         if (!pskb_pull(next, i))
 320                                 goto err;
 321
 322                         /* next fragment */
 323                         NFCT_FRAG6_CB(next)->offset += i;
 324                         fq->q.meat -= i;
 325                         if (next->ip_summed != CHECKSUM_UNNECESSARY)
 326                                 next->ip_summed = CHECKSUM_NONE;
 327                         break;
 328                 } else {
 329                         struct sk_buff *free_it = next;
 330
 331                         /* Old fragmnet is completely overridden with
 332                          * new one drop it.
 333                          */
 334                         next = next->next;
 335
 336                         if (prev)
 337                                 prev->next = next;
 338                         else
 339                                 fq->q.fragments = next;
 340
 341                         fq->q.meat -= free_it->len;
 342                         frag_kfree_skb(free_it);
 343                 }
 344         }
 345
 346         NFCT_FRAG6_CB(skb)->offset = offset;
 347
 348         /* Insert this fragment in the chain of fragments. */
 349         skb->next = next;
 350         if (!next)
 351                 fq->q.fragments_tail = skb;
 352         if (prev)
 353                 prev->next = skb;
 354         else
 355                 fq->q.fragments = skb;
 356
 357         skb->dev = NULL;
 358         fq->q.stamp = skb->tstamp;
 359         fq->q.meat += skb->len;
 360         atomic_add(skb->truesize, &nf_init_frags.mem);
 361
 362         /* The first fragment.
 363          * nhoffset is obtained from the first fragment, of course.
 364          */
 365         if (offset == 0) {
 366                 fq->nhoffset = nhoff;
 367                 fq->q.last_in |= INET_FRAG_FIRST_IN;
 368         }
 369         write_lock(&nf_frags.lock);
 370         list_move_tail(&fq->q.lru_list, &nf_init_frags.lru_list);
 371         write_unlock(&nf_frags.lock);
 372         return 0;
 373
 374 err:
 375         return -1;
 376 }
 377
 378 /*
 379  *      Check if this packet is complete.
 380  *      Returns NULL on failure by any reason, and pointer
 381  *      to current nexthdr field in reassembled frame.
 382  *
 383  *      It is called with locked fq, and caller must check that
 384  *      queue is eligible for reassembly i.e. it is not COMPLETE,
 385  *      the last and the first frames arrived and all the bits are here.
 386  */
 387 static struct sk_buff *
 388 nf_ct_frag6_reasm(struct nf_ct_frag6_queue *fq, struct net_device *dev)
 389 {
 390         struct sk_buff *fp, *op, *head = fq->q.fragments;
 391         int    payload_len;
 392
 393         fq_kill(fq);
 394
 395         WARN_ON(head == NULL);
 396         WARN_ON(NFCT_FRAG6_CB(head)->offset != 0);
 397
 398         /* Unfragmented part is taken from the first segment. */
 399         payload_len = ((head->data - skb_network_header(head)) -
 400                        sizeof(struct ipv6hdr) + fq->q.len -
 401                        sizeof(struct frag_hdr));
 402         if (payload_len > IPV6_MAXPLEN) {
 403                 pr_debug("payload len is too large.\n");
 404                 goto out_oversize;
 405         }
 406
 407         /* Head of list must not be cloned. */
 408         if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC)) {
 409                 pr_debug("skb is cloned but can't expand head");
 410                 goto out_oom;
 411         }
 412
 413         /* If the first fragment is fragmented itself, we split
 414          * it to two chunks: the first with data and paged part
 415          * and the second, holding only fragments. */
 416         if (skb_has_frags(head)) {
 417                 struct sk_buff *clone;
 418                 int i, plen = 0;
 419
 420                 if ((clone = alloc_skb(0, GFP_ATOMIC)) == NULL) {
 421                         pr_debug("Can't alloc skb\n");
 422                         goto out_oom;
 423                 }
 424                 clone->next = head->next;
 425                 head->next = clone;
 426                 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
 427                 skb_frag_list_init(head);
 428                 for (i=0; i<skb_shinfo(head)->nr_frags; i++)
 429                         plen += skb_shinfo(head)->frags[i].size;
 430                 clone->len = clone->data_len = head->data_len - plen;
 431                 head->data_len -= clone->len;
 432                 head->len -= clone->len;
 433                 clone->csum = 0;
 434                 clone->ip_summed = head->ip_summed;
 435
 436                 NFCT_FRAG6_CB(clone)->orig = NULL;
 437                 atomic_add(clone->truesize, &nf_init_frags.mem);
 438         }
 439
 440         /* We have to remove fragment header from datagram and to relocate
 441          * header in order to calculate ICV correctly. */
 442         skb_network_header(head)[fq->nhoffset] = skb_transport_header(head)[0];
 443         memmove(head->head + sizeof(struct frag_hdr), head->head,
 444                 (head->data - head->head) - sizeof(struct frag_hdr));
 445         head->mac_header += sizeof(struct frag_hdr);
 446         head->network_header += sizeof(struct frag_hdr);
 447
 448         skb_shinfo(head)->frag_list = head->next;
 449         skb_reset_transport_header(head);
 450         skb_push(head, head->data - skb_network_header(head));
 451
 452         for (fp=head->next; fp; fp = fp->next) {
 453                 head->data_len += fp->len;
 454                 head->len += fp->len;
 455                 if (head->ip_summed != fp->ip_summed)
 456                         head->ip_summed = CHECKSUM_NONE;
 457                 else if (head->ip_summed == CHECKSUM_COMPLETE)
 458                         head->csum = csum_add(head->csum, fp->csum);
 459                 head->truesize += fp->truesize;
 460         }
 461         atomic_sub(head->truesize, &nf_init_frags.mem);
 462
 463         head->next = NULL;
 464         head->dev = dev;
 465         head->tstamp = fq->q.stamp;
 466         ipv6_hdr(head)->payload_len = htons(payload_len);
 467
 468         /* Yes, and fold redundant checksum back. 8) */
 469         if (head->ip_summed == CHECKSUM_COMPLETE)
 470                 head->csum = csum_partial(skb_network_header(head),
 471                                           skb_network_header_len(head),
 472                                           head->csum);
 473
 474         fq->q.fragments = NULL;
 475         fq->q.fragments_tail = NULL;
 476
 477         /* all original skbs are linked into the NFCT_FRAG6_CB(head).orig */
 478         fp = skb_shinfo(head)->frag_list;
 479         if (fp && NFCT_FRAG6_CB(fp)->orig == NULL)
 480                 /* at above code, head skb is divided into two skbs. */
 481                 fp = fp->next;
 482
 483         op = NFCT_FRAG6_CB(head)->orig;
 484         for (; fp; fp = fp->next) {
 485                 struct sk_buff *orig = NFCT_FRAG6_CB(fp)->orig;
 486
 487                 op->next = orig;
 488                 op = orig;
 489                 NFCT_FRAG6_CB(fp)->orig = NULL;
 490         }
 491
 492         return head;
 493
 494 out_oversize:
 495         if (net_ratelimit())
 496                 printk(KERN_DEBUG "nf_ct_frag6_reasm: payload len = %d\n", payload_len);
 497         goto out_fail;
 498 out_oom:
 499         if (net_ratelimit())
 500                 printk(KERN_DEBUG "nf_ct_frag6_reasm: no memory for reassembly\n");
 501 out_fail:
 502         return NULL;
 503 }
 504
 505 /*
 506  * find the header just before Fragment Header.
 507  *
 508  * if success return 0 and set ...
 509  * (*prevhdrp): the value of "Next Header Field" in the header
 510  *              just before Fragment Header.
 511  * (*prevhoff): the offset of "Next Header Field" in the header
 512  *              just before Fragment Header.
 513  * (*fhoff)   : the offset of Fragment Header.
 514  *
 515  * Based on ipv6_skip_hdr() in net/ipv6/exthdr.c
 516  *
 517  */
 518 static int
 519 find_prev_fhdr(struct sk_buff *skb, u8 *prevhdrp, int *prevhoff, int *fhoff)
 520 {
 521         u8 nexthdr = ipv6_hdr(skb)->nexthdr;
 522         const int netoff = skb_network_offset(skb);
 523         u8 prev_nhoff = netoff + offsetof(struct ipv6hdr, nexthdr);
 524         int start = netoff + sizeof(struct ipv6hdr);
 525         int len = skb->len - start;
 526         u8 prevhdr = NEXTHDR_IPV6;
 527
 528         while (nexthdr != NEXTHDR_FRAGMENT) {
 529                 struct ipv6_opt_hdr hdr;
 530                 int hdrlen;
 531
 532                 if (!ipv6_ext_hdr(nexthdr)) {
 533                         return -1;
 534                 }
 535                 if (nexthdr == NEXTHDR_NONE) {
 536                         pr_debug("next header is none\n");
 537                         return -1;
 538                 }
 539                 if (len < (int)sizeof(struct ipv6_opt_hdr)) {
 540                         pr_debug("too short\n");
 541                         return -1;
 542                 }
 543                 if (skb_copy_bits(skb, start, &hdr, sizeof(hdr)))
 544                         BUG();
 545                 if (nexthdr == NEXTHDR_AUTH)
 546                         hdrlen = (hdr.hdrlen+2)<<2;
 547                 else
 548                         hdrlen = ipv6_optlen(&hdr);
 549
 550                 prevhdr = nexthdr;
 551                 prev_nhoff = start;
 552
 553                 nexthdr = hdr.nexthdr;
 554                 len -= hdrlen;
 555                 start += hdrlen;
 556         }
 557
 558         if (len < 0)
 559                 return -1;
 560
 561         *prevhdrp = prevhdr;
 562         *prevhoff = prev_nhoff;
 563         *fhoff = start;
 564
 565         return 0;
 566 }
 567
 568 struct sk_buff *nf_ct_frag6_gather(struct sk_buff *skb, u32 user)
 569 {
 570         struct sk_buff *clone;
 571         struct net_device *dev = skb->dev;
 572         struct frag_hdr *fhdr;
 573         struct nf_ct_frag6_queue *fq;
 574         struct ipv6hdr *hdr;
 575         int fhoff, nhoff;
 576         u8 prevhdr;
 577         struct sk_buff *ret_skb = NULL;
 578
 579         /* Jumbo payload inhibits frag. header */
 580         if (ipv6_hdr(skb)->payload_len == 0) {
 581                 pr_debug("payload len = 0\n");
 582                 return skb;
 583         }
 584
 585         if (find_prev_fhdr(skb, &prevhdr, &nhoff, &fhoff) < 0)
 586                 return skb;
 587
 588         clone = skb_clone(skb, GFP_ATOMIC);
 589         if (clone == NULL) {
 590                 pr_debug("Can't clone skb\n");
 591                 return skb;
 592         }
 593
 594         NFCT_FRAG6_CB(clone)->orig = skb;
 595
 596         if (!pskb_may_pull(clone, fhoff + sizeof(*fhdr))) {
 597                 pr_debug("message is too short.\n");
 598                 goto ret_orig;
 599         }
 600
 601         skb_set_transport_header(clone, fhoff);
 602         hdr = ipv6_hdr(clone);
 603         fhdr = (struct frag_hdr *)skb_transport_header(clone);
 604
 605         if (atomic_read(&nf_init_frags.mem) > nf_init_frags.high_thresh)
 606                 nf_ct_frag6_evictor();
 607
 608         fq = fq_find(fhdr->identification, user, &hdr->saddr, &hdr->daddr);
 609         if (fq == NULL) {
 610                 pr_debug("Can't find and can't create new queue\n");
 611                 goto ret_orig;
 612         }
 613
 614         spin_lock_bh(&fq->q.lock);
 615
 616         if (nf_ct_frag6_queue(fq, clone, fhdr, nhoff) < 0) {
 617                 spin_unlock_bh(&fq->q.lock);
 618                 pr_debug("Can't insert skb to queue\n");
 619                 fq_put(fq);
 620                 goto ret_orig;
 621         }
 622
 623         if (fq->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
 624             fq->q.meat == fq->q.len) {
 625                 ret_skb = nf_ct_frag6_reasm(fq, dev);
 626                 if (ret_skb == NULL)
 627                         pr_debug("Can't reassemble fragmented packets\n");
 628         }
 629         spin_unlock_bh(&fq->q.lock);
 630
 631         fq_put(fq);
 632         return ret_skb;
 633
 634 ret_orig:
 635         kfree_skb(clone);
 636         return skb;
 637 }
 638
 639 void nf_ct_frag6_output(unsigned int hooknum, struct sk_buff *skb,
 640                         struct net_device *in, struct net_device *out,
 641                         int (*okfn)(struct sk_buff *))
 642 {
 643         struct sk_buff *s, *s2;
 644
 645         for (s = NFCT_FRAG6_CB(skb)->orig; s;) {
 646                 nf_conntrack_put_reasm(s->nfct_reasm);
 647                 nf_conntrack_get_reasm(skb);
 648                 s->nfct_reasm = skb;
 649
 650                 s2 = s->next;
 651                 s->next = NULL;
 652
 653                 NF_HOOK_THRESH(NFPROTO_IPV6, hooknum, s, in, out, okfn,
 654                                NF_IP6_PRI_CONNTRACK_DEFRAG + 1);
 655                 s = s2;
 656         }
 657         nf_conntrack_put_reasm(skb);
 658 }
 659
 660 int nf_ct_frag6_init(void)
 661 {
 662         nf_frags.hashfn = nf_hashfn;
 663         nf_frags.constructor = ip6_frag_init;
 664         nf_frags.destructor = NULL;
 665         nf_frags.skb_free = nf_skb_free;
 666         nf_frags.qsize = sizeof(struct nf_ct_frag6_queue);
 667         nf_frags.match = ip6_frag_match;
 668         nf_frags.frag_expire = nf_ct_frag6_expire;
 669         nf_frags.secret_interval = 10 * 60 * HZ;
 670         nf_init_frags.timeout = IPV6_FRAG_TIMEOUT;
 671         nf_init_frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
 672         nf_init_frags.low_thresh = IPV6_FRAG_LOW_THRESH;
 673         inet_frags_init_net(&nf_init_frags);
 674         inet_frags_init(&nf_frags);
 675
 676         return 0;
 677 }
 678
 679 void nf_ct_frag6_cleanup(void)
 680 {
 681         inet_frags_fini(&nf_frags);
 682
 683         nf_init_frags.low_thresh = 0;
 684         nf_ct_frag6_evictor();
 685 }