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   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
  31 #include <net/sock.h>
  32 #include <net/snmp.h>
  33 #include <net/inet_frag.h>
  34
  35 #include <net/ipv6.h>
  36 #include <net/protocol.h>
  37 #include <net/transp_v6.h>
  38 #include <net/rawv6.h>
  39 #include <net/ndisc.h>
  40 #include <net/addrconf.h>
  41 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
  42 #include <linux/sysctl.h>
  43 #include <linux/netfilter.h>
  44 #include <linux/netfilter_ipv6.h>
  45 #include <linux/kernel.h>
  46 #include <linux/module.h>
  47
  48 #define NF_CT_FRAG6_HIGH_THRESH 262144 /* == 256*1024 */
  49 #define NF_CT_FRAG6_LOW_THRESH 196608  /* == 192*1024 */
  50 #define NF_CT_FRAG6_TIMEOUT IPV6_FRAG_TIMEOUT
  51
  52 struct nf_ct_frag6_skb_cb
  53 {
  54         struct inet6_skb_parm   h;
  55         int                     offset;
  56         struct sk_buff          *orig;
  57 };
  58
  59 #define NFCT_FRAG6_CB(skb)      ((struct nf_ct_frag6_skb_cb*)((skb)->cb))
  60
  61 struct nf_ct_frag6_queue
  62 {
  63         struct inet_frag_queue  q;
  64
  65         __be32                  id;             /* fragment id          */
  66         u32                     user;
  67         struct in6_addr         saddr;
  68         struct in6_addr         daddr;
  69
  70         unsigned int            csum;
  71         __u16                   nhoffset;
  72 };
  73
  74 static struct inet_frags nf_frags;
  75 static struct netns_frags nf_init_frags;
  76
  77 #ifdef CONFIG_SYSCTL
  78 struct ctl_table nf_ct_ipv6_sysctl_table[] = {
  79         {
  80                 .procname       = "nf_conntrack_frag6_timeout",
  81                 .data           = &nf_init_frags.timeout,
  82                 .maxlen         = sizeof(unsigned int),
  83                 .mode           = 0644,
  84                 .proc_handler   = proc_dointvec_jiffies,
  85         },
  86         {
  87                 .procname       = "nf_conntrack_frag6_low_thresh",
  88                 .data           = &nf_init_frags.low_thresh,
  89                 .maxlen         = sizeof(unsigned int),
  90                 .mode           = 0644,
  91                 .proc_handler   = proc_dointvec,
  92         },
  93         {
  94                 .procname       = "nf_conntrack_frag6_high_thresh",
  95                 .data           = &nf_init_frags.high_thresh,
  96                 .maxlen         = sizeof(unsigned int),
  97                 .mode           = 0644,
  98                 .proc_handler   = proc_dointvec,
  99         },
 100         { }
 101 };
 102 #endif
 103
 104 static unsigned int nf_hashfn(struct inet_frag_queue *q)
 105 {
 106         const struct nf_ct_frag6_queue *nq;
 107
 108         nq = container_of(q, struct nf_ct_frag6_queue, q);
 109         return inet6_hash_frag(nq->id, &nq->saddr, &nq->daddr, nf_frags.rnd);
 110 }
 111
 112 static void nf_skb_free(struct sk_buff *skb)
 113 {
 114         if (NFCT_FRAG6_CB(skb)->orig)
 115                 kfree_skb(NFCT_FRAG6_CB(skb)->orig);
 116 }
 117
 118 /* Memory Tracking Functions. */
 119 static inline void frag_kfree_skb(struct sk_buff *skb, unsigned int *work)
 120 {
 121         if (work)
 122                 *work -= skb->truesize;
 123         atomic_sub(skb->truesize, &nf_init_frags.mem);
 124         nf_skb_free(skb);
 125         kfree_skb(skb);
 126 }
 127
 128 /* Destruction primitives. */
 129
 130 static __inline__ void fq_put(struct nf_ct_frag6_queue *fq)
 131 {
 132         inet_frag_put(&fq->q, &nf_frags);
 133 }
 134
 135 /* Kill fq entry. It is not destroyed immediately,
 136  * because caller (and someone more) holds reference count.
 137  */
 138 static __inline__ void fq_kill(struct nf_ct_frag6_queue *fq)
 139 {
 140         inet_frag_kill(&fq->q, &nf_frags);
 141 }
 142
 143 static void nf_ct_frag6_evictor(void)
 144 {
 145         local_bh_disable();
 146         inet_frag_evictor(&nf_init_frags, &nf_frags);
 147         local_bh_enable();
 148 }
 149
 150 static void nf_ct_frag6_expire(unsigned long data)
 151 {
 152         struct nf_ct_frag6_queue *fq;
 153
 154         fq = container_of((struct inet_frag_queue *)data,
 155                         struct nf_ct_frag6_queue, q);
 156
 157         spin_lock(&fq->q.lock);
 158
 159         if (fq->q.last_in & INET_FRAG_COMPLETE)
 160                 goto out;
 161
 162         fq_kill(fq);
 163
 164 out:
 165         spin_unlock(&fq->q.lock);
 166         fq_put(fq);
 167 }
 168
 169 /* Creation primitives. */
 170
 171 static __inline__ struct nf_ct_frag6_queue *
 172 fq_find(__be32 id, u32 user, struct in6_addr *src, struct in6_addr *dst)
 173 {
 174         struct inet_frag_queue *q;
 175         struct ip6_create_arg arg;
 176         unsigned int hash;
 177
 178         arg.id = id;
 179         arg.user = user;
 180         arg.src = src;
 181         arg.dst = dst;
 182
 183         read_lock_bh(&nf_frags.lock);
 184         hash = inet6_hash_frag(id, src, dst, nf_frags.rnd);
 185
 186         q = inet_frag_find(&nf_init_frags, &nf_frags, &arg, hash);
 187         local_bh_enable();
 188         if (q == NULL)
 189                 goto oom;
 190
 191         return container_of(q, struct nf_ct_frag6_queue, q);
 192
 193 oom:
 194         pr_debug("Can't alloc new queue\n");
 195         return NULL;
 196 }
 197
 198
 199 static int nf_ct_frag6_queue(struct nf_ct_frag6_queue *fq, struct sk_buff *skb,
 200                              const struct frag_hdr *fhdr, int nhoff)
 201 {
 202         struct sk_buff *prev, *next;
 203         int offset, end;
 204
 205         if (fq->q.last_in & INET_FRAG_COMPLETE) {
 206                 pr_debug("Allready completed\n");
 207                 goto err;
 208         }
 209
 210         offset = ntohs(fhdr->frag_off) & ~0x7;
 211         end = offset + (ntohs(ipv6_hdr(skb)->payload_len) -
 212                         ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
 213
 214         if ((unsigned int)end > IPV6_MAXPLEN) {
 215                 pr_debug("offset is too large.\n");
 216                 return -1;
 217         }
 218
 219         if (skb->ip_summed == CHECKSUM_COMPLETE) {
 220                 const unsigned char *nh = skb_network_header(skb);
 221                 skb->csum = csum_sub(skb->csum,
 222                                      csum_partial(nh, (u8 *)(fhdr + 1) - nh,
 223                                                   0));
 224         }
 225
 226         /* Is this the final fragment? */
 227         if (!(fhdr->frag_off & htons(IP6_MF))) {
 228                 /* If we already have some bits beyond end
 229                  * or have different end, the segment is corrupted.
 230                  */
 231                 if (end < fq->q.len ||
 232                     ((fq->q.last_in & INET_FRAG_LAST_IN) && end != fq->q.len)) {
 233                         pr_debug("already received last fragment\n");
 234                         goto err;
 235                 }
 236                 fq->q.last_in |= INET_FRAG_LAST_IN;
 237                 fq->q.len = end;
 238         } else {
 239                 /* Check if the fragment is rounded to 8 bytes.
 240                  * Required by the RFC.
 241                  */
 242                 if (end & 0x7) {
 243                         /* RFC2460 says always send parameter problem in
 244                          * this case. -DaveM
 245                          */
 246                         pr_debug("end of fragment not rounded to 8 bytes.\n");
 247                         return -1;
 248                 }
 249                 if (end > fq->q.len) {
 250                         /* Some bits beyond end -> corruption. */
 251                         if (fq->q.last_in & INET_FRAG_LAST_IN) {
 252                                 pr_debug("last packet already reached.\n");
 253                                 goto err;
 254                         }
 255                         fq->q.len = end;
 256                 }
 257         }
 258
 259         if (end == offset)
 260                 goto err;
 261
 262         /* Point into the IP datagram 'data' part. */
 263         if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data)) {
 264                 pr_debug("queue: message is too short.\n");
 265                 goto err;
 266         }
 267         if (pskb_trim_rcsum(skb, end - offset)) {
 268                 pr_debug("Can't trim\n");
 269                 goto err;
 270         }
 271
 272         /* Find out which fragments are in front and at the back of us
 273          * in the chain of fragments so far.  We must know where to put
 274          * this fragment, right?
 275          */
 276         prev = NULL;
 277         for (next = fq->q.fragments; next != NULL; next = next->next) {
 278                 if (NFCT_FRAG6_CB(next)->offset >= offset)
 279                         break;  /* bingo! */
 280                 prev = next;
 281         }
 282
 283         /* We found where to put this one.  Check for overlap with
 284          * preceding fragment, and, if needed, align things so that
 285          * any overlaps are eliminated.
 286          */
 287         if (prev) {
 288                 int i = (NFCT_FRAG6_CB(prev)->offset + prev->len) - offset;
 289
 290                 if (i > 0) {
 291                         offset += i;
 292                         if (end <= offset) {
 293                                 pr_debug("overlap\n");
 294                                 goto err;
 295                         }
 296                         if (!pskb_pull(skb, i)) {
 297                                 pr_debug("Can't pull\n");
 298                                 goto err;
 299                         }
 300                         if (skb->ip_summed != CHECKSUM_UNNECESSARY)
 301                                 skb->ip_summed = CHECKSUM_NONE;
 302                 }
 303         }
 304
 305         /* Look for overlap with succeeding segments.
 306          * If we can merge fragments, do it.
 307          */
 308         while (next && NFCT_FRAG6_CB(next)->offset < end) {
 309                 /* overlap is 'i' bytes */
 310                 int i = end - NFCT_FRAG6_CB(next)->offset;
 311
 312                 if (i < next->len) {
 313                         /* Eat head of the next overlapped fragment
 314                          * and leave the loop. The next ones cannot overlap.
 315                          */
 316                         pr_debug("Eat head of the overlapped parts.: %d", i);
 317                         if (!pskb_pull(next, i))
 318                                 goto err;
 319
 320                         /* next fragment */
 321                         NFCT_FRAG6_CB(next)->offset += i;
 322                         fq->q.meat -= i;
 323                         if (next->ip_summed != CHECKSUM_UNNECESSARY)
 324                                 next->ip_summed = CHECKSUM_NONE;
 325                         break;
 326                 } else {
 327                         struct sk_buff *free_it = next;
 328
 329                         /* Old fragmnet is completely overridden with
 330                          * new one drop it.
 331                          */
 332                         next = next->next;
 333
 334                         if (prev)
 335                                 prev->next = next;
 336                         else
 337                                 fq->q.fragments = next;
 338
 339                         fq->q.meat -= free_it->len;
 340                         frag_kfree_skb(free_it, NULL);
 341                 }
 342         }
 343
 344         NFCT_FRAG6_CB(skb)->offset = offset;
 345
 346         /* Insert this fragment in the chain of fragments. */
 347         skb->next = next;
 348         if (prev)
 349                 prev->next = skb;
 350         else
 351                 fq->q.fragments = skb;
 352
 353         skb->dev = NULL;
 354         fq->q.stamp = skb->tstamp;
 355         fq->q.meat += skb->len;
 356         atomic_add(skb->truesize, &nf_init_frags.mem);
 357
 358         /* The first fragment.
 359          * nhoffset is obtained from the first fragment, of course.
 360          */
 361         if (offset == 0) {
 362                 fq->nhoffset = nhoff;
 363                 fq->q.last_in |= INET_FRAG_FIRST_IN;
 364         }
 365         write_lock(&nf_frags.lock);
 366         list_move_tail(&fq->q.lru_list, &nf_init_frags.lru_list);
 367         write_unlock(&nf_frags.lock);
 368         return 0;
 369
 370 err:
 371         return -1;
 372 }
 373
 374 /*
 375  *      Check if this packet is complete.
 376  *      Returns NULL on failure by any reason, and pointer
 377  *      to current nexthdr field in reassembled frame.
 378  *
 379  *      It is called with locked fq, and caller must check that
 380  *      queue is eligible for reassembly i.e. it is not COMPLETE,
 381  *      the last and the first frames arrived and all the bits are here.
 382  */
 383 static struct sk_buff *
 384 nf_ct_frag6_reasm(struct nf_ct_frag6_queue *fq, struct net_device *dev)
 385 {
 386         struct sk_buff *fp, *op, *head = fq->q.fragments;
 387         int    payload_len;
 388
 389         fq_kill(fq);
 390
 391         WARN_ON(head == NULL);
 392         WARN_ON(NFCT_FRAG6_CB(head)->offset != 0);
 393
 394         /* Unfragmented part is taken from the first segment. */
 395         payload_len = ((head->data - skb_network_header(head)) -
 396                        sizeof(struct ipv6hdr) + fq->q.len -
 397                        sizeof(struct frag_hdr));
 398         if (payload_len > IPV6_MAXPLEN) {
 399                 pr_debug("payload len is too large.\n");
 400                 goto out_oversize;
 401         }
 402
 403         /* Head of list must not be cloned. */
 404         if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC)) {
 405                 pr_debug("skb is cloned but can't expand head");
 406                 goto out_oom;
 407         }
 408
 409         /* If the first fragment is fragmented itself, we split
 410          * it to two chunks: the first with data and paged part
 411          * and the second, holding only fragments. */
 412         if (skb_has_frags(head)) {
 413                 struct sk_buff *clone;
 414                 int i, plen = 0;
 415
 416                 if ((clone = alloc_skb(0, GFP_ATOMIC)) == NULL) {
 417                         pr_debug("Can't alloc skb\n");
 418                         goto out_oom;
 419                 }
 420                 clone->next = head->next;
 421                 head->next = clone;
 422                 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
 423                 skb_frag_list_init(head);
 424                 for (i=0; i<skb_shinfo(head)->nr_frags; i++)
 425                         plen += skb_shinfo(head)->frags[i].size;
 426                 clone->len = clone->data_len = head->data_len - plen;
 427                 head->data_len -= clone->len;
 428                 head->len -= clone->len;
 429                 clone->csum = 0;
 430                 clone->ip_summed = head->ip_summed;
 431
 432                 NFCT_FRAG6_CB(clone)->orig = NULL;
 433                 atomic_add(clone->truesize, &nf_init_frags.mem);
 434         }
 435
 436         /* We have to remove fragment header from datagram and to relocate
 437          * header in order to calculate ICV correctly. */
 438         skb_network_header(head)[fq->nhoffset] = skb_transport_header(head)[0];
 439         memmove(head->head + sizeof(struct frag_hdr), head->head,
 440                 (head->data - head->head) - sizeof(struct frag_hdr));
 441         head->mac_header += sizeof(struct frag_hdr);
 442         head->network_header += sizeof(struct frag_hdr);
 443
 444         skb_shinfo(head)->frag_list = head->next;
 445         skb_reset_transport_header(head);
 446         skb_push(head, head->data - skb_network_header(head));
 447         atomic_sub(head->truesize, &nf_init_frags.mem);
 448
 449         for (fp=head->next; fp; fp = fp->next) {
 450                 head->data_len += fp->len;
 451                 head->len += fp->len;
 452                 if (head->ip_summed != fp->ip_summed)
 453                         head->ip_summed = CHECKSUM_NONE;
 454                 else if (head->ip_summed == CHECKSUM_COMPLETE)
 455                         head->csum = csum_add(head->csum, fp->csum);
 456                 head->truesize += fp->truesize;
 457                 atomic_sub(fp->truesize, &nf_init_frags.mem);
 458         }
 459
 460         head->next = NULL;
 461         head->dev = dev;
 462         head->tstamp = fq->q.stamp;
 463         ipv6_hdr(head)->payload_len = htons(payload_len);
 464
 465         /* Yes, and fold redundant checksum back. 8) */
 466         if (head->ip_summed == CHECKSUM_COMPLETE)
 467                 head->csum = csum_partial(skb_network_header(head),
 468                                           skb_network_header_len(head),
 469                                           head->csum);
 470
 471         fq->q.fragments = NULL;
 472
 473         /* all original skbs are linked into the NFCT_FRAG6_CB(head).orig */
 474         fp = skb_shinfo(head)->frag_list;
 475         if (NFCT_FRAG6_CB(fp)->orig == NULL)
 476                 /* at above code, head skb is divided into two skbs. */
 477                 fp = fp->next;
 478
 479         op = NFCT_FRAG6_CB(head)->orig;
 480         for (; fp; fp = fp->next) {
 481                 struct sk_buff *orig = NFCT_FRAG6_CB(fp)->orig;
 482
 483                 op->next = orig;
 484                 op = orig;
 485                 NFCT_FRAG6_CB(fp)->orig = NULL;
 486         }
 487
 488         return head;
 489
 490 out_oversize:
 491         if (net_ratelimit())
 492                 printk(KERN_DEBUG "nf_ct_frag6_reasm: payload len = %d\n", payload_len);
 493         goto out_fail;
 494 out_oom:
 495         if (net_ratelimit())
 496                 printk(KERN_DEBUG "nf_ct_frag6_reasm: no memory for reassembly\n");
 497 out_fail:
 498         return NULL;
 499 }
 500
 501 /*
 502  * find the header just before Fragment Header.
 503  *
 504  * if success return 0 and set ...
 505  * (*prevhdrp): the value of "Next Header Field" in the header
 506  *              just before Fragment Header.
 507  * (*prevhoff): the offset of "Next Header Field" in the header
 508  *              just before Fragment Header.
 509  * (*fhoff)   : the offset of Fragment Header.
 510  *
 511  * Based on ipv6_skip_hdr() in net/ipv6/exthdr.c
 512  *
 513  */
 514 static int
 515 find_prev_fhdr(struct sk_buff *skb, u8 *prevhdrp, int *prevhoff, int *fhoff)
 516 {
 517         u8 nexthdr = ipv6_hdr(skb)->nexthdr;
 518         const int netoff = skb_network_offset(skb);
 519         u8 prev_nhoff = netoff + offsetof(struct ipv6hdr, nexthdr);
 520         int start = netoff + sizeof(struct ipv6hdr);
 521         int len = skb->len - start;
 522         u8 prevhdr = NEXTHDR_IPV6;
 523
 524         while (nexthdr != NEXTHDR_FRAGMENT) {
 525                 struct ipv6_opt_hdr hdr;
 526                 int hdrlen;
 527
 528                 if (!ipv6_ext_hdr(nexthdr)) {
 529                         return -1;
 530                 }
 531                 if (nexthdr == NEXTHDR_NONE) {
 532                         pr_debug("next header is none\n");
 533                         return -1;
 534                 }
 535                 if (len < (int)sizeof(struct ipv6_opt_hdr)) {
 536                         pr_debug("too short\n");
 537                         return -1;
 538                 }
 539                 if (skb_copy_bits(skb, start, &hdr, sizeof(hdr)))
 540                         BUG();
 541                 if (nexthdr == NEXTHDR_AUTH)
 542                         hdrlen = (hdr.hdrlen+2)<<2;
 543                 else
 544                         hdrlen = ipv6_optlen(&hdr);
 545
 546                 prevhdr = nexthdr;
 547                 prev_nhoff = start;
 548
 549                 nexthdr = hdr.nexthdr;
 550                 len -= hdrlen;
 551                 start += hdrlen;
 552         }
 553
 554         if (len < 0)
 555                 return -1;
 556
 557         *prevhdrp = prevhdr;
 558         *prevhoff = prev_nhoff;
 559         *fhoff = start;
 560
 561         return 0;
 562 }
 563
 564 struct sk_buff *nf_ct_frag6_gather(struct sk_buff *skb, u32 user)
 565 {
 566         struct sk_buff *clone;
 567         struct net_device *dev = skb->dev;
 568         struct frag_hdr *fhdr;
 569         struct nf_ct_frag6_queue *fq;
 570         struct ipv6hdr *hdr;
 571         int fhoff, nhoff;
 572         u8 prevhdr;
 573         struct sk_buff *ret_skb = NULL;
 574
 575         /* Jumbo payload inhibits frag. header */
 576         if (ipv6_hdr(skb)->payload_len == 0) {
 577                 pr_debug("payload len = 0\n");
 578                 return skb;
 579         }
 580
 581         if (find_prev_fhdr(skb, &prevhdr, &nhoff, &fhoff) < 0)
 582                 return skb;
 583
 584         clone = skb_clone(skb, GFP_ATOMIC);
 585         if (clone == NULL) {
 586                 pr_debug("Can't clone skb\n");
 587                 return skb;
 588         }
 589
 590         NFCT_FRAG6_CB(clone)->orig = skb;
 591
 592         if (!pskb_may_pull(clone, fhoff + sizeof(*fhdr))) {
 593                 pr_debug("message is too short.\n");
 594                 goto ret_orig;
 595         }
 596
 597         skb_set_transport_header(clone, fhoff);
 598         hdr = ipv6_hdr(clone);
 599         fhdr = (struct frag_hdr *)skb_transport_header(clone);
 600
 601         if (!(fhdr->frag_off & htons(0xFFF9))) {
 602                 pr_debug("Invalid fragment offset\n");
 603                 /* It is not a fragmented frame */
 604                 goto ret_orig;
 605         }
 606
 607         if (atomic_read(&nf_init_frags.mem) > nf_init_frags.high_thresh)
 608                 nf_ct_frag6_evictor();
 609
 610         fq = fq_find(fhdr->identification, user, &hdr->saddr, &hdr->daddr);
 611         if (fq == NULL) {
 612                 pr_debug("Can't find and can't create new queue\n");
 613                 goto ret_orig;
 614         }
 615
 616         spin_lock_bh(&fq->q.lock);
 617
 618         if (nf_ct_frag6_queue(fq, clone, fhdr, nhoff) < 0) {
 619                 spin_unlock_bh(&fq->q.lock);
 620                 pr_debug("Can't insert skb to queue\n");
 621                 fq_put(fq);
 622                 goto ret_orig;
 623         }
 624
 625         if (fq->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
 626             fq->q.meat == fq->q.len) {
 627                 ret_skb = nf_ct_frag6_reasm(fq, dev);
 628                 if (ret_skb == NULL)
 629                         pr_debug("Can't reassemble fragmented packets\n");
 630         }
 631         spin_unlock_bh(&fq->q.lock);
 632
 633         fq_put(fq);
 634         return ret_skb;
 635
 636 ret_orig:
 637         kfree_skb(clone);
 638         return skb;
 639 }
 640
 641 void nf_ct_frag6_output(unsigned int hooknum, struct sk_buff *skb,
 642                         struct net_device *in, struct net_device *out,
 643                         int (*okfn)(struct sk_buff *))
 644 {
 645         struct sk_buff *s, *s2;
 646
 647         for (s = NFCT_FRAG6_CB(skb)->orig; s;) {
 648                 nf_conntrack_put_reasm(s->nfct_reasm);
 649                 nf_conntrack_get_reasm(skb);
 650                 s->nfct_reasm = skb;
 651
 652                 s2 = s->next;
 653                 s->next = NULL;
 654
 655                 NF_HOOK_THRESH(PF_INET6, hooknum, s, in, out, okfn,
 656                                NF_IP6_PRI_CONNTRACK_DEFRAG + 1);
 657                 s = s2;
 658         }
 659         nf_conntrack_put_reasm(skb);
 660 }
 661
 662 int nf_ct_frag6_init(void)
 663 {
 664         nf_frags.hashfn = nf_hashfn;
 665         nf_frags.constructor = ip6_frag_init;
 666         nf_frags.destructor = NULL;
 667         nf_frags.skb_free = nf_skb_free;
 668         nf_frags.qsize = sizeof(struct nf_ct_frag6_queue);
 669         nf_frags.match = ip6_frag_match;
 670         nf_frags.frag_expire = nf_ct_frag6_expire;
 671         nf_frags.secret_interval = 10 * 60 * HZ;
 672         nf_init_frags.timeout = IPV6_FRAG_TIMEOUT;
 673         nf_init_frags.high_thresh = 256 * 1024;
 674         nf_init_frags.low_thresh = 192 * 1024;
 675         inet_frags_init_net(&nf_init_frags);
 676         inet_frags_init(&nf_frags);
 677
 678         return 0;
 679 }
 680
 681 void nf_ct_frag6_cleanup(void)
 682 {
 683         inet_frags_fini(&nf_frags);
 684
 685         nf_init_frags.low_thresh = 0;
 686         nf_ct_frag6_evictor();
 687 }