blob: 89184b576e2377f1190c69a36476d320e263c265 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * IPv6 fragment reassembly
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003 * Linux INET6 implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Pedro Roque <roque@di.fc.ul.pt>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * Based on: net/ipv4/ip_fragment.c
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090016/*
17 * Fixes:
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 * Andi Kleen Make it work with multiple hosts.
19 * More RFC compliance.
20 *
21 * Horst von Brand Add missing #include <linux/string.h>
22 * Alexey Kuznetsov SMP races, threading, cleanup.
23 * Patrick McHardy LRU queue of frag heads for evictor.
24 * Mitsuru KANDA @USAGI Register inet6_protocol{}.
25 * David Stevens and
26 * YOSHIFUJI,H. @USAGI Always remove fragment header to
27 * calculate ICV correctly.
28 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/errno.h>
30#include <linux/types.h>
31#include <linux/string.h>
32#include <linux/socket.h>
33#include <linux/sockios.h>
34#include <linux/jiffies.h>
35#include <linux/net.h>
36#include <linux/list.h>
37#include <linux/netdevice.h>
38#include <linux/in6.h>
39#include <linux/ipv6.h>
40#include <linux/icmpv6.h>
41#include <linux/random.h>
42#include <linux/jhash.h>
Herbert Xuf61944e2007-10-15 01:28:47 -070043#include <linux/skbuff.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45#include <net/sock.h>
46#include <net/snmp.h>
47
48#include <net/ipv6.h>
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +090049#include <net/ip6_route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <net/protocol.h>
51#include <net/transp_v6.h>
52#include <net/rawv6.h>
53#include <net/ndisc.h>
54#include <net/addrconf.h>
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -070055#include <net/inet_frag.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Linus Torvalds1da177e2005-04-16 15:20:36 -070057struct ip6frag_skb_cb
58{
59 struct inet6_skb_parm h;
60 int offset;
61};
62
63#define FRAG6_CB(skb) ((struct ip6frag_skb_cb*)((skb)->cb))
64
65
66/*
67 * Equivalent of ipv4 struct ipq
68 */
69
70struct frag_queue
71{
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -070072 struct inet_frag_queue q;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Al Viroe69a4ad2006-11-14 20:56:00 -080074 __be32 id; /* fragment id */
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 struct in6_addr saddr;
76 struct in6_addr daddr;
77
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 int iif;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 unsigned int csum;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 __u16 nhoffset;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081};
82
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070083static struct inet_frags ip6_frags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
Pavel Emelyanove5a2bb8422008-01-22 06:06:23 -080085int ip6_frag_nqueues(struct net *net)
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070086{
Pavel Emelyanove5a2bb8422008-01-22 06:06:23 -080087 return net->ipv6.frags.nqueues;
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070088}
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -080090int ip6_frag_mem(struct net *net)
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070091{
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -080092 return atomic_read(&net->ipv6.frags.mem);
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070093}
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Herbert Xuf61944e2007-10-15 01:28:47 -070095static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
96 struct net_device *dev);
97
Zach Brownf6596f92006-04-10 16:05:34 -070098/*
99 * callers should be careful not to use the hash value outside the ipfrag_lock
100 * as doing so could race with ipfrag_hash_rnd being recalculated.
101 */
Al Viroe69a4ad2006-11-14 20:56:00 -0800102static unsigned int ip6qhashfn(__be32 id, struct in6_addr *saddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 struct in6_addr *daddr)
104{
105 u32 a, b, c;
106
Al Viroe69a4ad2006-11-14 20:56:00 -0800107 a = (__force u32)saddr->s6_addr32[0];
108 b = (__force u32)saddr->s6_addr32[1];
109 c = (__force u32)saddr->s6_addr32[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
111 a += JHASH_GOLDEN_RATIO;
112 b += JHASH_GOLDEN_RATIO;
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700113 c += ip6_frags.rnd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 __jhash_mix(a, b, c);
115
Al Viroe69a4ad2006-11-14 20:56:00 -0800116 a += (__force u32)saddr->s6_addr32[3];
117 b += (__force u32)daddr->s6_addr32[0];
118 c += (__force u32)daddr->s6_addr32[1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 __jhash_mix(a, b, c);
120
Al Viroe69a4ad2006-11-14 20:56:00 -0800121 a += (__force u32)daddr->s6_addr32[2];
122 b += (__force u32)daddr->s6_addr32[3];
123 c += (__force u32)id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 __jhash_mix(a, b, c);
125
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700126 return c & (INETFRAGS_HASHSZ - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127}
128
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700129static unsigned int ip6_hashfn(struct inet_frag_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700131 struct frag_queue *fq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700133 fq = container_of(q, struct frag_queue, q);
134 return ip6qhashfn(fq->id, &fq->saddr, &fq->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135}
136
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700137int ip6_frag_match(struct inet_frag_queue *q, void *a)
138{
139 struct frag_queue *fq;
140 struct ip6_create_arg *arg = a;
141
142 fq = container_of(q, struct frag_queue, q);
143 return (fq->id == arg->id &&
144 ipv6_addr_equal(&fq->saddr, arg->src) &&
145 ipv6_addr_equal(&fq->daddr, arg->dst));
146}
147EXPORT_SYMBOL(ip6_frag_match);
148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149/* Memory Tracking Functions. */
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800150static inline void frag_kfree_skb(struct netns_frags *nf,
151 struct sk_buff *skb, int *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
153 if (work)
154 *work -= skb->truesize;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800155 atomic_sub(skb->truesize, &nf->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 kfree_skb(skb);
157}
158
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700159void ip6_frag_init(struct inet_frag_queue *q, void *a)
160{
161 struct frag_queue *fq = container_of(q, struct frag_queue, q);
162 struct ip6_create_arg *arg = a;
163
164 fq->id = arg->id;
165 ipv6_addr_copy(&fq->saddr, arg->src);
166 ipv6_addr_copy(&fq->daddr, arg->dst);
167}
168EXPORT_SYMBOL(ip6_frag_init);
169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170/* Destruction primitives. */
171
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700172static __inline__ void fq_put(struct frag_queue *fq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173{
Pavel Emelyanov762cc402007-10-15 02:41:56 -0700174 inet_frag_put(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175}
176
177/* Kill fq entry. It is not destroyed immediately,
178 * because caller (and someone more) holds reference count.
179 */
180static __inline__ void fq_kill(struct frag_queue *fq)
181{
Pavel Emelyanov277e6502007-10-15 02:37:18 -0700182 inet_frag_kill(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
184
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800185static void ip6_evictor(struct net *net, struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186{
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700187 int evicted;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800189 evicted = inet_frag_evictor(&net->ipv6.frags, &ip6_frags);
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700190 if (evicted)
191 IP6_ADD_STATS_BH(idev, IPSTATS_MIB_REASMFAILS, evicted);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192}
193
194static void ip6_frag_expire(unsigned long data)
195{
Pavel Emelyanove521db92007-10-17 19:45:23 -0700196 struct frag_queue *fq;
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900197 struct net_device *dev = NULL;
Daniel Lezcano4ac2ccd2008-05-02 17:02:03 -0700198 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
Pavel Emelyanove521db92007-10-17 19:45:23 -0700200 fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
201
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700202 spin_lock(&fq->q.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Joe Perchesbc578a52008-03-28 16:35:27 -0700204 if (fq->q.last_in & INET_FRAG_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 goto out;
206
207 fq_kill(fq);
208
Daniel Lezcano4ac2ccd2008-05-02 17:02:03 -0700209 net = container_of(fq->q.net, struct net, ipv6.frags);
210 dev = dev_get_by_index(net, fq->iif);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900211 if (!dev)
212 goto out;
213
214 rcu_read_lock();
215 IP6_INC_STATS_BH(__in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
216 IP6_INC_STATS_BH(__in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
217 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
Ingo Oeser78c784c2006-03-20 23:01:17 -0800219 /* Don't send error if the first segment did not arrive. */
Joe Perchesbc578a52008-03-28 16:35:27 -0700220 if (!(fq->q.last_in & INET_FRAG_FIRST_IN) || !fq->q.fragments)
Ingo Oeser78c784c2006-03-20 23:01:17 -0800221 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
Ingo Oeser78c784c2006-03-20 23:01:17 -0800223 /*
224 But use as source device on which LAST ARRIVED
225 segment was received. And do not use fq->dev
226 pointer directly, device might already disappeared.
227 */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700228 fq->q.fragments->dev = dev;
229 icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230out:
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900231 if (dev)
232 dev_put(dev);
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700233 spin_unlock(&fq->q.lock);
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700234 fq_put(fq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235}
236
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700237static __inline__ struct frag_queue *
Pavel Emelyanovac18e752008-01-22 06:02:14 -0800238fq_find(struct net *net, __be32 id, struct in6_addr *src, struct in6_addr *dst,
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700239 struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240{
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700241 struct inet_frag_queue *q;
242 struct ip6_create_arg arg;
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700243 unsigned int hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700245 arg.id = id;
246 arg.src = src;
247 arg.dst = dst;
Pavel Emelyanov9a375802008-06-27 20:06:08 -0700248
249 read_lock(&ip6_frags.lock);
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700250 hash = ip6qhashfn(id, src, dst);
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700251
Pavel Emelyanovac18e752008-01-22 06:02:14 -0800252 q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash);
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700253 if (q == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 goto oom;
255
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700256 return container_of(q, struct frag_queue, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258oom:
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900259 IP6_INC_STATS_BH(idev, IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 return NULL;
261}
262
Herbert Xuf61944e2007-10-15 01:28:47 -0700263static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 struct frag_hdr *fhdr, int nhoff)
265{
266 struct sk_buff *prev, *next;
Herbert Xuf61944e2007-10-15 01:28:47 -0700267 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 int offset, end;
269
Joe Perchesbc578a52008-03-28 16:35:27 -0700270 if (fq->q.last_in & INET_FRAG_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 goto err;
272
273 offset = ntohs(fhdr->frag_off) & ~0x7;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700274 end = offset + (ntohs(ipv6_hdr(skb)->payload_len) -
275 ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
277 if ((unsigned int)end > IPV6_MAXPLEN) {
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900278 IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
279 IPSTATS_MIB_INHDRERRORS);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700280 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
281 ((u8 *)&fhdr->frag_off -
282 skb_network_header(skb)));
Herbert Xuf61944e2007-10-15 01:28:47 -0700283 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 }
285
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700286 if (skb->ip_summed == CHECKSUM_COMPLETE) {
287 const unsigned char *nh = skb_network_header(skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900288 skb->csum = csum_sub(skb->csum,
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700289 csum_partial(nh, (u8 *)(fhdr + 1) - nh,
290 0));
291 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
293 /* Is this the final fragment? */
294 if (!(fhdr->frag_off & htons(IP6_MF))) {
295 /* If we already have some bits beyond end
296 * or have different end, the segment is corrupted.
297 */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700298 if (end < fq->q.len ||
Joe Perchesbc578a52008-03-28 16:35:27 -0700299 ((fq->q.last_in & INET_FRAG_LAST_IN) && end != fq->q.len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 goto err;
Joe Perchesbc578a52008-03-28 16:35:27 -0700301 fq->q.last_in |= INET_FRAG_LAST_IN;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700302 fq->q.len = end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 } else {
304 /* Check if the fragment is rounded to 8 bytes.
305 * Required by the RFC.
306 */
307 if (end & 0x7) {
308 /* RFC2460 says always send parameter problem in
309 * this case. -DaveM
310 */
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900311 IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
312 IPSTATS_MIB_INHDRERRORS);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900313 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 offsetof(struct ipv6hdr, payload_len));
Herbert Xuf61944e2007-10-15 01:28:47 -0700315 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 }
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700317 if (end > fq->q.len) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 /* Some bits beyond end -> corruption. */
Joe Perchesbc578a52008-03-28 16:35:27 -0700319 if (fq->q.last_in & INET_FRAG_LAST_IN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 goto err;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700321 fq->q.len = end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 }
323 }
324
325 if (end == offset)
326 goto err;
327
328 /* Point into the IP datagram 'data' part. */
329 if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data))
330 goto err;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900331
Stephen Hemminger42ca89c2005-09-08 12:57:43 -0700332 if (pskb_trim_rcsum(skb, end - offset))
333 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
335 /* Find out which fragments are in front and at the back of us
336 * in the chain of fragments so far. We must know where to put
337 * this fragment, right?
338 */
339 prev = NULL;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700340 for(next = fq->q.fragments; next != NULL; next = next->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 if (FRAG6_CB(next)->offset >= offset)
342 break; /* bingo! */
343 prev = next;
344 }
345
346 /* We found where to put this one. Check for overlap with
347 * preceding fragment, and, if needed, align things so that
348 * any overlaps are eliminated.
349 */
350 if (prev) {
351 int i = (FRAG6_CB(prev)->offset + prev->len) - offset;
352
353 if (i > 0) {
354 offset += i;
355 if (end <= offset)
356 goto err;
357 if (!pskb_pull(skb, i))
358 goto err;
359 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
360 skb->ip_summed = CHECKSUM_NONE;
361 }
362 }
363
364 /* Look for overlap with succeeding segments.
365 * If we can merge fragments, do it.
366 */
367 while (next && FRAG6_CB(next)->offset < end) {
368 int i = end - FRAG6_CB(next)->offset; /* overlap is 'i' bytes */
369
370 if (i < next->len) {
371 /* Eat head of the next overlapped fragment
372 * and leave the loop. The next ones cannot overlap.
373 */
374 if (!pskb_pull(next, i))
375 goto err;
376 FRAG6_CB(next)->offset += i; /* next fragment */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700377 fq->q.meat -= i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 if (next->ip_summed != CHECKSUM_UNNECESSARY)
379 next->ip_summed = CHECKSUM_NONE;
380 break;
381 } else {
382 struct sk_buff *free_it = next;
383
384 /* Old fragment is completely overridden with
385 * new one drop it.
386 */
387 next = next->next;
388
389 if (prev)
390 prev->next = next;
391 else
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700392 fq->q.fragments = next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700394 fq->q.meat -= free_it->len;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800395 frag_kfree_skb(fq->q.net, free_it, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 }
397 }
398
399 FRAG6_CB(skb)->offset = offset;
400
401 /* Insert this fragment in the chain of fragments. */
402 skb->next = next;
403 if (prev)
404 prev->next = skb;
405 else
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700406 fq->q.fragments = skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
Herbert Xuf61944e2007-10-15 01:28:47 -0700408 dev = skb->dev;
409 if (dev) {
410 fq->iif = dev->ifindex;
411 skb->dev = NULL;
412 }
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700413 fq->q.stamp = skb->tstamp;
414 fq->q.meat += skb->len;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800415 atomic_add(skb->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
417 /* The first fragment.
418 * nhoffset is obtained from the first fragment, of course.
419 */
420 if (offset == 0) {
421 fq->nhoffset = nhoff;
Joe Perchesbc578a52008-03-28 16:35:27 -0700422 fq->q.last_in |= INET_FRAG_FIRST_IN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 }
Herbert Xuf61944e2007-10-15 01:28:47 -0700424
Joe Perchesbc578a52008-03-28 16:35:27 -0700425 if (fq->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
426 fq->q.meat == fq->q.len)
Herbert Xuf61944e2007-10-15 01:28:47 -0700427 return ip6_frag_reasm(fq, prev, dev);
428
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700429 write_lock(&ip6_frags.lock);
Pavel Emelyanov3140c252008-01-22 06:11:48 -0800430 list_move_tail(&fq->q.lru_list, &fq->q.net->lru_list);
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700431 write_unlock(&ip6_frags.lock);
Herbert Xuf61944e2007-10-15 01:28:47 -0700432 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
434err:
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900435 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 kfree_skb(skb);
Herbert Xuf61944e2007-10-15 01:28:47 -0700437 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438}
439
440/*
441 * Check if this packet is complete.
442 * Returns NULL on failure by any reason, and pointer
443 * to current nexthdr field in reassembled frame.
444 *
445 * It is called with locked fq, and caller must check that
446 * queue is eligible for reassembly i.e. it is not COMPLETE,
447 * the last and the first frames arrived and all the bits are here.
448 */
Herbert Xuf61944e2007-10-15 01:28:47 -0700449static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 struct net_device *dev)
451{
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700452 struct sk_buff *fp, *head = fq->q.fragments;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 int payload_len;
454 unsigned int nhoff;
455
456 fq_kill(fq);
457
Herbert Xuf61944e2007-10-15 01:28:47 -0700458 /* Make the one we just received the head. */
459 if (prev) {
460 head = prev->next;
461 fp = skb_clone(head, GFP_ATOMIC);
462
463 if (!fp)
464 goto out_oom;
465
466 fp->next = head->next;
467 prev->next = fp;
468
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700469 skb_morph(head, fq->q.fragments);
470 head->next = fq->q.fragments->next;
Herbert Xuf61944e2007-10-15 01:28:47 -0700471
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700472 kfree_skb(fq->q.fragments);
473 fq->q.fragments = head;
Herbert Xuf61944e2007-10-15 01:28:47 -0700474 }
475
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700476 WARN_ON(head == NULL);
477 WARN_ON(FRAG6_CB(head)->offset != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
479 /* Unfragmented part is taken from the first segment. */
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700480 payload_len = ((head->data - skb_network_header(head)) -
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700481 sizeof(struct ipv6hdr) + fq->q.len -
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700482 sizeof(struct frag_hdr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 if (payload_len > IPV6_MAXPLEN)
484 goto out_oversize;
485
486 /* Head of list must not be cloned. */
487 if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC))
488 goto out_oom;
489
490 /* If the first fragment is fragmented itself, we split
491 * it to two chunks: the first with data and paged part
492 * and the second, holding only fragments. */
493 if (skb_shinfo(head)->frag_list) {
494 struct sk_buff *clone;
495 int i, plen = 0;
496
497 if ((clone = alloc_skb(0, GFP_ATOMIC)) == NULL)
498 goto out_oom;
499 clone->next = head->next;
500 head->next = clone;
501 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
502 skb_shinfo(head)->frag_list = NULL;
503 for (i=0; i<skb_shinfo(head)->nr_frags; i++)
504 plen += skb_shinfo(head)->frags[i].size;
505 clone->len = clone->data_len = head->data_len - plen;
506 head->data_len -= clone->len;
507 head->len -= clone->len;
508 clone->csum = 0;
509 clone->ip_summed = head->ip_summed;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800510 atomic_add(clone->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 }
512
513 /* We have to remove fragment header from datagram and to relocate
514 * header in order to calculate ICV correctly. */
515 nhoff = fq->nhoffset;
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700516 skb_network_header(head)[nhoff] = skb_transport_header(head)[0];
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900517 memmove(head->head + sizeof(struct frag_hdr), head->head,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 (head->data - head->head) - sizeof(struct frag_hdr));
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700519 head->mac_header += sizeof(struct frag_hdr);
520 head->network_header += sizeof(struct frag_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
522 skb_shinfo(head)->frag_list = head->next;
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300523 skb_reset_transport_header(head);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700524 skb_push(head, head->data - skb_network_header(head));
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800525 atomic_sub(head->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
527 for (fp=head->next; fp; fp = fp->next) {
528 head->data_len += fp->len;
529 head->len += fp->len;
530 if (head->ip_summed != fp->ip_summed)
531 head->ip_summed = CHECKSUM_NONE;
Patrick McHardy84fa7932006-08-29 16:44:56 -0700532 else if (head->ip_summed == CHECKSUM_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 head->csum = csum_add(head->csum, fp->csum);
534 head->truesize += fp->truesize;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800535 atomic_sub(fp->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 }
537
538 head->next = NULL;
539 head->dev = dev;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700540 head->tstamp = fq->q.stamp;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700541 ipv6_hdr(head)->payload_len = htons(payload_len);
Patrick McHardy951dbc82006-01-06 23:02:34 -0800542 IP6CB(head)->nhoff = nhoff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 /* Yes, and fold redundant checksum back. 8) */
Patrick McHardy84fa7932006-08-29 16:44:56 -0700545 if (head->ip_summed == CHECKSUM_COMPLETE)
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700546 head->csum = csum_partial(skb_network_header(head),
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300547 skb_network_header_len(head),
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700548 head->csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900550 rcu_read_lock();
551 IP6_INC_STATS_BH(__in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
552 rcu_read_unlock();
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700553 fq->q.fragments = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 return 1;
555
556out_oversize:
557 if (net_ratelimit())
558 printk(KERN_DEBUG "ip6_frag_reasm: payload len = %d\n", payload_len);
559 goto out_fail;
560out_oom:
561 if (net_ratelimit())
562 printk(KERN_DEBUG "ip6_frag_reasm: no memory for reassembly\n");
563out_fail:
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900564 rcu_read_lock();
565 IP6_INC_STATS_BH(__in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
566 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 return -1;
568}
569
Herbert Xue5bbef22007-10-15 12:50:28 -0700570static int ipv6_frag_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 struct frag_hdr *fhdr;
573 struct frag_queue *fq;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700574 struct ipv6hdr *hdr = ipv6_hdr(skb);
Pavel Emelyanovac18e752008-01-22 06:02:14 -0800575 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900577 IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_REASMREQDS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
579 /* Jumbo payload inhibits frag. header */
580 if (hdr->payload_len==0) {
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900581 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INHDRERRORS);
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300582 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
583 skb_network_header_len(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 return -1;
585 }
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700586 if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
587 sizeof(struct frag_hdr)))) {
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900588 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INHDRERRORS);
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300589 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
590 skb_network_header_len(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 return -1;
592 }
593
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700594 hdr = ipv6_hdr(skb);
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700595 fhdr = (struct frag_hdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
597 if (!(fhdr->frag_off & htons(0xFFF9))) {
598 /* It is not a fragmented frame */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700599 skb->transport_header += sizeof(struct frag_hdr);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900600 IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_REASMOKS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700602 IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 return 1;
604 }
605
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900606 net = dev_net(skb->dev);
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800607 if (atomic_read(&net->ipv6.frags.mem) > net->ipv6.frags.high_thresh)
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800608 ip6_evictor(net, ip6_dst_idev(skb->dst));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
Pavel Emelyanovac18e752008-01-22 06:02:14 -0800610 if ((fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr,
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900611 ip6_dst_idev(skb->dst))) != NULL) {
Herbert Xuf61944e2007-10-15 01:28:47 -0700612 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700614 spin_lock(&fq->q.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615
Herbert Xuf61944e2007-10-15 01:28:47 -0700616 ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700618 spin_unlock(&fq->q.lock);
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700619 fq_put(fq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 return ret;
621 }
622
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900623 IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 kfree_skb(skb);
625 return -1;
626}
627
628static struct inet6_protocol frag_protocol =
629{
630 .handler = ipv6_frag_rcv,
631 .flags = INET6_PROTO_NOPOLICY,
632};
633
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800634#ifdef CONFIG_SYSCTL
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700635static struct ctl_table ip6_frags_ns_ctl_table[] = {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800636 {
637 .ctl_name = NET_IPV6_IP6FRAG_HIGH_THRESH,
638 .procname = "ip6frag_high_thresh",
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800639 .data = &init_net.ipv6.frags.high_thresh,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800640 .maxlen = sizeof(int),
641 .mode = 0644,
642 .proc_handler = &proc_dointvec
643 },
644 {
645 .ctl_name = NET_IPV6_IP6FRAG_LOW_THRESH,
646 .procname = "ip6frag_low_thresh",
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800647 .data = &init_net.ipv6.frags.low_thresh,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800648 .maxlen = sizeof(int),
649 .mode = 0644,
650 .proc_handler = &proc_dointvec
651 },
652 {
653 .ctl_name = NET_IPV6_IP6FRAG_TIME,
654 .procname = "ip6frag_time",
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800655 .data = &init_net.ipv6.frags.timeout,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800656 .maxlen = sizeof(int),
657 .mode = 0644,
658 .proc_handler = &proc_dointvec_jiffies,
659 .strategy = &sysctl_jiffies,
660 },
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700661 { }
662};
663
664static struct ctl_table ip6_frags_ctl_table[] = {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800665 {
666 .ctl_name = NET_IPV6_IP6FRAG_SECRET_INTERVAL,
667 .procname = "ip6frag_secret_interval",
Pavel Emelyanov3b4bc4a2008-01-22 06:11:04 -0800668 .data = &ip6_frags.secret_interval,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800669 .maxlen = sizeof(int),
670 .mode = 0644,
671 .proc_handler = &proc_dointvec_jiffies,
672 .strategy = &sysctl_jiffies
673 },
674 { }
675};
Daniel Lezcano7d460db2008-01-18 23:52:35 -0800676
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700677static int ip6_frags_ns_sysctl_register(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800678{
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800679 struct ctl_table *table;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800680 struct ctl_table_header *hdr;
681
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700682 table = ip6_frags_ns_ctl_table;
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800683 if (net != &init_net) {
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700684 table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800685 if (table == NULL)
686 goto err_alloc;
687
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800688 table[0].data = &net->ipv6.frags.high_thresh;
689 table[1].data = &net->ipv6.frags.low_thresh;
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800690 table[2].data = &net->ipv6.frags.timeout;
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800691 }
692
693 hdr = register_net_sysctl_table(net, net_ipv6_ctl_path, table);
694 if (hdr == NULL)
695 goto err_reg;
696
697 net->ipv6.sysctl.frags_hdr = hdr;
698 return 0;
699
700err_reg:
701 if (net != &init_net)
702 kfree(table);
703err_alloc:
704 return -ENOMEM;
705}
706
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700707static void ip6_frags_ns_sysctl_unregister(struct net *net)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800708{
709 struct ctl_table *table;
710
711 table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
712 unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
713 kfree(table);
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800714}
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700715
716static struct ctl_table_header *ip6_ctl_header;
717
718static int ip6_frags_sysctl_register(void)
719{
720 ip6_ctl_header = register_net_sysctl_rotable(net_ipv6_ctl_path,
721 ip6_frags_ctl_table);
722 return ip6_ctl_header == NULL ? -ENOMEM : 0;
723}
724
725static void ip6_frags_sysctl_unregister(void)
726{
727 unregister_net_sysctl_table(ip6_ctl_header);
728}
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800729#else
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700730static inline int ip6_frags_ns_sysctl_register(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800731{
732 return 0;
733}
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800734
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700735static inline void ip6_frags_ns_sysctl_unregister(struct net *net)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800736{
737}
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700738
739static inline int ip6_frags_sysctl_register(void)
740{
741 return 0;
742}
743
744static inline void ip6_frags_sysctl_unregister(void)
745{
746}
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800747#endif
748
749static int ipv6_frags_init_net(struct net *net)
750{
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800751 net->ipv6.frags.high_thresh = 256 * 1024;
752 net->ipv6.frags.low_thresh = 192 * 1024;
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800753 net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800754
Pavel Emelyanove5a2bb8422008-01-22 06:06:23 -0800755 inet_frags_init_net(&net->ipv6.frags);
756
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700757 return ip6_frags_ns_sysctl_register(net);
Daniel Lezcanoe71e0342008-01-10 02:56:03 -0800758}
759
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800760static void ipv6_frags_exit_net(struct net *net)
761{
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700762 ip6_frags_ns_sysctl_unregister(net);
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800763 inet_frags_exit_net(&net->ipv6.frags, &ip6_frags);
764}
765
766static struct pernet_operations ip6_frags_ops = {
767 .init = ipv6_frags_init_net,
768 .exit = ipv6_frags_exit_net,
769};
770
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800771int __init ipv6_frag_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772{
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800773 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800775 ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
776 if (ret)
777 goto out;
Daniel Lezcanoe71e0342008-01-10 02:56:03 -0800778
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700779 ret = ip6_frags_sysctl_register();
780 if (ret)
781 goto err_sysctl;
782
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700783 ret = register_pernet_subsys(&ip6_frags_ops);
784 if (ret)
785 goto err_pernet;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800786
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700787 ip6_frags.hashfn = ip6_hashfn;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700788 ip6_frags.constructor = ip6_frag_init;
Pavel Emelyanovc9547702007-10-17 19:48:26 -0700789 ip6_frags.destructor = NULL;
Pavel Emelyanov1e4b8282007-10-15 02:39:14 -0700790 ip6_frags.skb_free = NULL;
791 ip6_frags.qsize = sizeof(struct frag_queue);
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700792 ip6_frags.match = ip6_frag_match;
Pavel Emelyanove521db92007-10-17 19:45:23 -0700793 ip6_frags.frag_expire = ip6_frag_expire;
Pavel Emelyanov3b4bc4a2008-01-22 06:11:04 -0800794 ip6_frags.secret_interval = 10 * 60 * HZ;
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700795 inet_frags_init(&ip6_frags);
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800796out:
797 return ret;
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700798
799err_pernet:
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700800 ip6_frags_sysctl_unregister();
801err_sysctl:
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700802 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
803 goto out;
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800804}
805
806void ipv6_frag_exit(void)
807{
808 inet_frags_fini(&ip6_frags);
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700809 ip6_frags_sysctl_unregister();
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800810 unregister_pernet_subsys(&ip6_frags_ops);
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800811 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812}