blob: 3c575118fca51d05d73c35968a0960b1b92a6005 [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 */
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700102unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
103 const struct in6_addr *daddr, u32 rnd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
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;
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700113 c += 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}
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700128EXPORT_SYMBOL_GPL(inet6_hash_frag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700130static unsigned int ip6_hashfn(struct inet_frag_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131{
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700132 struct frag_queue *fq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700134 fq = container_of(q, struct frag_queue, q);
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700135 return inet6_hash_frag(fq->id, &fq->saddr, &fq->daddr, ip6_frags.rnd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136}
137
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700138int ip6_frag_match(struct inet_frag_queue *q, void *a)
139{
140 struct frag_queue *fq;
141 struct ip6_create_arg *arg = a;
142
143 fq = container_of(q, struct frag_queue, q);
144 return (fq->id == arg->id &&
145 ipv6_addr_equal(&fq->saddr, arg->src) &&
146 ipv6_addr_equal(&fq->daddr, arg->dst));
147}
148EXPORT_SYMBOL(ip6_frag_match);
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150/* Memory Tracking Functions. */
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800151static inline void frag_kfree_skb(struct netns_frags *nf,
152 struct sk_buff *skb, int *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153{
154 if (work)
155 *work -= skb->truesize;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800156 atomic_sub(skb->truesize, &nf->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 kfree_skb(skb);
158}
159
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700160void ip6_frag_init(struct inet_frag_queue *q, void *a)
161{
162 struct frag_queue *fq = container_of(q, struct frag_queue, q);
163 struct ip6_create_arg *arg = a;
164
165 fq->id = arg->id;
166 ipv6_addr_copy(&fq->saddr, arg->src);
167 ipv6_addr_copy(&fq->daddr, arg->dst);
168}
169EXPORT_SYMBOL(ip6_frag_init);
170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171/* Destruction primitives. */
172
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700173static __inline__ void fq_put(struct frag_queue *fq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174{
Pavel Emelyanov762cc402007-10-15 02:41:56 -0700175 inet_frag_put(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176}
177
178/* Kill fq entry. It is not destroyed immediately,
179 * because caller (and someone more) holds reference count.
180 */
181static __inline__ void fq_kill(struct frag_queue *fq)
182{
Pavel Emelyanov277e6502007-10-15 02:37:18 -0700183 inet_frag_kill(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184}
185
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800186static void ip6_evictor(struct net *net, struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187{
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700188 int evicted;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800190 evicted = inet_frag_evictor(&net->ipv6.frags, &ip6_frags);
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700191 if (evicted)
Denis V. Lunev821d5772008-10-08 10:32:43 -0700192 IP6_ADD_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS, evicted);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193}
194
195static void ip6_frag_expire(unsigned long data)
196{
Pavel Emelyanove521db92007-10-17 19:45:23 -0700197 struct frag_queue *fq;
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900198 struct net_device *dev = NULL;
Daniel Lezcano4ac2ccd2008-05-02 17:02:03 -0700199 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
Pavel Emelyanove521db92007-10-17 19:45:23 -0700201 fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
202
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700203 spin_lock(&fq->q.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
Joe Perchesbc578a52008-03-28 16:35:27 -0700205 if (fq->q.last_in & INET_FRAG_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 goto out;
207
208 fq_kill(fq);
209
Daniel Lezcano4ac2ccd2008-05-02 17:02:03 -0700210 net = container_of(fq->q.net, struct net, ipv6.frags);
211 dev = dev_get_by_index(net, fq->iif);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900212 if (!dev)
213 goto out;
214
215 rcu_read_lock();
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700216 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
217 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900218 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
Ingo Oeser78c784c2006-03-20 23:01:17 -0800220 /* Don't send error if the first segment did not arrive. */
Joe Perchesbc578a52008-03-28 16:35:27 -0700221 if (!(fq->q.last_in & INET_FRAG_FIRST_IN) || !fq->q.fragments)
Ingo Oeser78c784c2006-03-20 23:01:17 -0800222 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
Ingo Oeser78c784c2006-03-20 23:01:17 -0800224 /*
225 But use as source device on which LAST ARRIVED
226 segment was received. And do not use fq->dev
227 pointer directly, device might already disappeared.
228 */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700229 fq->q.fragments->dev = dev;
230 icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231out:
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900232 if (dev)
233 dev_put(dev);
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700234 spin_unlock(&fq->q.lock);
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700235 fq_put(fq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236}
237
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700238static __inline__ struct frag_queue *
Pavel Emelyanovac18e752008-01-22 06:02:14 -0800239fq_find(struct net *net, __be32 id, struct in6_addr *src, struct in6_addr *dst,
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700240 struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241{
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700242 struct inet_frag_queue *q;
243 struct ip6_create_arg arg;
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700244 unsigned int hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700246 arg.id = id;
247 arg.src = src;
248 arg.dst = dst;
Pavel Emelyanov9a375802008-06-27 20:06:08 -0700249
250 read_lock(&ip6_frags.lock);
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700251 hash = inet6_hash_frag(id, src, dst, ip6_frags.rnd);
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700252
Pavel Emelyanovac18e752008-01-22 06:02:14 -0800253 q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash);
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700254 if (q == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 goto oom;
256
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700257 return container_of(q, struct frag_queue, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
259oom:
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700260 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 return NULL;
262}
263
Herbert Xuf61944e2007-10-15 01:28:47 -0700264static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 struct frag_hdr *fhdr, int nhoff)
266{
267 struct sk_buff *prev, *next;
Herbert Xuf61944e2007-10-15 01:28:47 -0700268 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 int offset, end;
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700270 struct net *net = dev_net(skb->dst->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Joe Perchesbc578a52008-03-28 16:35:27 -0700272 if (fq->q.last_in & INET_FRAG_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 goto err;
274
275 offset = ntohs(fhdr->frag_off) & ~0x7;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700276 end = offset + (ntohs(ipv6_hdr(skb)->payload_len) -
277 ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
279 if ((unsigned int)end > IPV6_MAXPLEN) {
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700280 IP6_INC_STATS_BH(net, ip6_dst_idev(skb->dst),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900281 IPSTATS_MIB_INHDRERRORS);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700282 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
283 ((u8 *)&fhdr->frag_off -
284 skb_network_header(skb)));
Herbert Xuf61944e2007-10-15 01:28:47 -0700285 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 }
287
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700288 if (skb->ip_summed == CHECKSUM_COMPLETE) {
289 const unsigned char *nh = skb_network_header(skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900290 skb->csum = csum_sub(skb->csum,
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700291 csum_partial(nh, (u8 *)(fhdr + 1) - nh,
292 0));
293 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295 /* Is this the final fragment? */
296 if (!(fhdr->frag_off & htons(IP6_MF))) {
297 /* If we already have some bits beyond end
298 * or have different end, the segment is corrupted.
299 */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700300 if (end < fq->q.len ||
Joe Perchesbc578a52008-03-28 16:35:27 -0700301 ((fq->q.last_in & INET_FRAG_LAST_IN) && end != fq->q.len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 goto err;
Joe Perchesbc578a52008-03-28 16:35:27 -0700303 fq->q.last_in |= INET_FRAG_LAST_IN;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700304 fq->q.len = end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 } else {
306 /* Check if the fragment is rounded to 8 bytes.
307 * Required by the RFC.
308 */
309 if (end & 0x7) {
310 /* RFC2460 says always send parameter problem in
311 * this case. -DaveM
312 */
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700313 IP6_INC_STATS_BH(net, ip6_dst_idev(skb->dst),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900314 IPSTATS_MIB_INHDRERRORS);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900315 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 offsetof(struct ipv6hdr, payload_len));
Herbert Xuf61944e2007-10-15 01:28:47 -0700317 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 }
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700319 if (end > fq->q.len) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 /* Some bits beyond end -> corruption. */
Joe Perchesbc578a52008-03-28 16:35:27 -0700321 if (fq->q.last_in & INET_FRAG_LAST_IN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 goto err;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700323 fq->q.len = end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 }
325 }
326
327 if (end == offset)
328 goto err;
329
330 /* Point into the IP datagram 'data' part. */
331 if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data))
332 goto err;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900333
Stephen Hemminger42ca89c2005-09-08 12:57:43 -0700334 if (pskb_trim_rcsum(skb, end - offset))
335 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337 /* Find out which fragments are in front and at the back of us
338 * in the chain of fragments so far. We must know where to put
339 * this fragment, right?
340 */
341 prev = NULL;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700342 for(next = fq->q.fragments; next != NULL; next = next->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 if (FRAG6_CB(next)->offset >= offset)
344 break; /* bingo! */
345 prev = next;
346 }
347
348 /* We found where to put this one. Check for overlap with
349 * preceding fragment, and, if needed, align things so that
350 * any overlaps are eliminated.
351 */
352 if (prev) {
353 int i = (FRAG6_CB(prev)->offset + prev->len) - offset;
354
355 if (i > 0) {
356 offset += i;
357 if (end <= offset)
358 goto err;
359 if (!pskb_pull(skb, i))
360 goto err;
361 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
362 skb->ip_summed = CHECKSUM_NONE;
363 }
364 }
365
366 /* Look for overlap with succeeding segments.
367 * If we can merge fragments, do it.
368 */
369 while (next && FRAG6_CB(next)->offset < end) {
370 int i = end - FRAG6_CB(next)->offset; /* overlap is 'i' bytes */
371
372 if (i < next->len) {
373 /* Eat head of the next overlapped fragment
374 * and leave the loop. The next ones cannot overlap.
375 */
376 if (!pskb_pull(next, i))
377 goto err;
378 FRAG6_CB(next)->offset += i; /* next fragment */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700379 fq->q.meat -= i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 if (next->ip_summed != CHECKSUM_UNNECESSARY)
381 next->ip_summed = CHECKSUM_NONE;
382 break;
383 } else {
384 struct sk_buff *free_it = next;
385
386 /* Old fragment is completely overridden with
387 * new one drop it.
388 */
389 next = next->next;
390
391 if (prev)
392 prev->next = next;
393 else
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700394 fq->q.fragments = next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700396 fq->q.meat -= free_it->len;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800397 frag_kfree_skb(fq->q.net, free_it, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 }
399 }
400
401 FRAG6_CB(skb)->offset = offset;
402
403 /* Insert this fragment in the chain of fragments. */
404 skb->next = next;
405 if (prev)
406 prev->next = skb;
407 else
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700408 fq->q.fragments = skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
Herbert Xuf61944e2007-10-15 01:28:47 -0700410 dev = skb->dev;
411 if (dev) {
412 fq->iif = dev->ifindex;
413 skb->dev = NULL;
414 }
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700415 fq->q.stamp = skb->tstamp;
416 fq->q.meat += skb->len;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800417 atomic_add(skb->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
419 /* The first fragment.
420 * nhoffset is obtained from the first fragment, of course.
421 */
422 if (offset == 0) {
423 fq->nhoffset = nhoff;
Joe Perchesbc578a52008-03-28 16:35:27 -0700424 fq->q.last_in |= INET_FRAG_FIRST_IN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 }
Herbert Xuf61944e2007-10-15 01:28:47 -0700426
Joe Perchesbc578a52008-03-28 16:35:27 -0700427 if (fq->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
428 fq->q.meat == fq->q.len)
Herbert Xuf61944e2007-10-15 01:28:47 -0700429 return ip6_frag_reasm(fq, prev, dev);
430
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700431 write_lock(&ip6_frags.lock);
Pavel Emelyanov3140c252008-01-22 06:11:48 -0800432 list_move_tail(&fq->q.lru_list, &fq->q.net->lru_list);
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700433 write_unlock(&ip6_frags.lock);
Herbert Xuf61944e2007-10-15 01:28:47 -0700434 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436err:
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700437 IP6_INC_STATS(net, ip6_dst_idev(skb->dst),
Denis V. Lunev3bd653c2008-10-08 10:54:51 -0700438 IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 kfree_skb(skb);
Herbert Xuf61944e2007-10-15 01:28:47 -0700440 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441}
442
443/*
444 * Check if this packet is complete.
445 * Returns NULL on failure by any reason, and pointer
446 * to current nexthdr field in reassembled frame.
447 *
448 * It is called with locked fq, and caller must check that
449 * queue is eligible for reassembly i.e. it is not COMPLETE,
450 * the last and the first frames arrived and all the bits are here.
451 */
Herbert Xuf61944e2007-10-15 01:28:47 -0700452static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 struct net_device *dev)
454{
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700455 struct sk_buff *fp, *head = fq->q.fragments;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 int payload_len;
457 unsigned int nhoff;
458
459 fq_kill(fq);
460
Herbert Xuf61944e2007-10-15 01:28:47 -0700461 /* Make the one we just received the head. */
462 if (prev) {
463 head = prev->next;
464 fp = skb_clone(head, GFP_ATOMIC);
465
466 if (!fp)
467 goto out_oom;
468
469 fp->next = head->next;
470 prev->next = fp;
471
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700472 skb_morph(head, fq->q.fragments);
473 head->next = fq->q.fragments->next;
Herbert Xuf61944e2007-10-15 01:28:47 -0700474
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700475 kfree_skb(fq->q.fragments);
476 fq->q.fragments = head;
Herbert Xuf61944e2007-10-15 01:28:47 -0700477 }
478
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700479 WARN_ON(head == NULL);
480 WARN_ON(FRAG6_CB(head)->offset != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
482 /* Unfragmented part is taken from the first segment. */
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700483 payload_len = ((head->data - skb_network_header(head)) -
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700484 sizeof(struct ipv6hdr) + fq->q.len -
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700485 sizeof(struct frag_hdr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 if (payload_len > IPV6_MAXPLEN)
487 goto out_oversize;
488
489 /* Head of list must not be cloned. */
490 if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC))
491 goto out_oom;
492
493 /* If the first fragment is fragmented itself, we split
494 * it to two chunks: the first with data and paged part
495 * and the second, holding only fragments. */
496 if (skb_shinfo(head)->frag_list) {
497 struct sk_buff *clone;
498 int i, plen = 0;
499
500 if ((clone = alloc_skb(0, GFP_ATOMIC)) == NULL)
501 goto out_oom;
502 clone->next = head->next;
503 head->next = clone;
504 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
505 skb_shinfo(head)->frag_list = NULL;
506 for (i=0; i<skb_shinfo(head)->nr_frags; i++)
507 plen += skb_shinfo(head)->frags[i].size;
508 clone->len = clone->data_len = head->data_len - plen;
509 head->data_len -= clone->len;
510 head->len -= clone->len;
511 clone->csum = 0;
512 clone->ip_summed = head->ip_summed;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800513 atomic_add(clone->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 }
515
516 /* We have to remove fragment header from datagram and to relocate
517 * header in order to calculate ICV correctly. */
518 nhoff = fq->nhoffset;
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700519 skb_network_header(head)[nhoff] = skb_transport_header(head)[0];
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900520 memmove(head->head + sizeof(struct frag_hdr), head->head,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 (head->data - head->head) - sizeof(struct frag_hdr));
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700522 head->mac_header += sizeof(struct frag_hdr);
523 head->network_header += sizeof(struct frag_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
525 skb_shinfo(head)->frag_list = head->next;
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300526 skb_reset_transport_header(head);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700527 skb_push(head, head->data - skb_network_header(head));
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800528 atomic_sub(head->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
530 for (fp=head->next; fp; fp = fp->next) {
531 head->data_len += fp->len;
532 head->len += fp->len;
533 if (head->ip_summed != fp->ip_summed)
534 head->ip_summed = CHECKSUM_NONE;
Patrick McHardy84fa7932006-08-29 16:44:56 -0700535 else if (head->ip_summed == CHECKSUM_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 head->csum = csum_add(head->csum, fp->csum);
537 head->truesize += fp->truesize;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800538 atomic_sub(fp->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 }
540
541 head->next = NULL;
542 head->dev = dev;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700543 head->tstamp = fq->q.stamp;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700544 ipv6_hdr(head)->payload_len = htons(payload_len);
Patrick McHardy951dbc82006-01-06 23:02:34 -0800545 IP6CB(head)->nhoff = nhoff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 /* Yes, and fold redundant checksum back. 8) */
Patrick McHardy84fa7932006-08-29 16:44:56 -0700548 if (head->ip_summed == CHECKSUM_COMPLETE)
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700549 head->csum = csum_partial(skb_network_header(head),
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300550 skb_network_header_len(head),
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700551 head->csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900553 rcu_read_lock();
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700554 IP6_INC_STATS_BH(dev_net(dev),
555 __in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900556 rcu_read_unlock();
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700557 fq->q.fragments = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 return 1;
559
560out_oversize:
561 if (net_ratelimit())
562 printk(KERN_DEBUG "ip6_frag_reasm: payload len = %d\n", payload_len);
563 goto out_fail;
564out_oom:
565 if (net_ratelimit())
566 printk(KERN_DEBUG "ip6_frag_reasm: no memory for reassembly\n");
567out_fail:
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900568 rcu_read_lock();
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700569 IP6_INC_STATS_BH(dev_net(dev),
570 __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900571 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 return -1;
573}
574
Herbert Xue5bbef22007-10-15 12:50:28 -0700575static int ipv6_frag_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 struct frag_hdr *fhdr;
578 struct frag_queue *fq;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700579 struct ipv6hdr *hdr = ipv6_hdr(skb);
Denis V. Lunev3bd653c2008-10-08 10:54:51 -0700580 struct net *net = dev_net(skb->dst->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700582 IP6_INC_STATS_BH(net, ip6_dst_idev(skb->dst), IPSTATS_MIB_REASMREQDS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
584 /* Jumbo payload inhibits frag. header */
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700585 if (hdr->payload_len==0)
586 goto fail_hdr;
587
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700588 if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700589 sizeof(struct frag_hdr))))
590 goto fail_hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700592 hdr = ipv6_hdr(skb);
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700593 fhdr = (struct frag_hdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
595 if (!(fhdr->frag_off & htons(0xFFF9))) {
596 /* It is not a fragmented frame */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700597 skb->transport_header += sizeof(struct frag_hdr);
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700598 IP6_INC_STATS_BH(net,
599 ip6_dst_idev(skb->dst), IPSTATS_MIB_REASMOKS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700601 IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 return 1;
603 }
604
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800605 if (atomic_read(&net->ipv6.frags.mem) > net->ipv6.frags.high_thresh)
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800606 ip6_evictor(net, ip6_dst_idev(skb->dst));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
Pavel Emelyanovac18e752008-01-22 06:02:14 -0800608 if ((fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr,
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900609 ip6_dst_idev(skb->dst))) != NULL) {
Herbert Xuf61944e2007-10-15 01:28:47 -0700610 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700612 spin_lock(&fq->q.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
Herbert Xuf61944e2007-10-15 01:28:47 -0700614 ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700616 spin_unlock(&fq->q.lock);
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700617 fq_put(fq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 return ret;
619 }
620
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700621 IP6_INC_STATS_BH(net, ip6_dst_idev(skb->dst), IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 kfree_skb(skb);
623 return -1;
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700624
625fail_hdr:
Denis V. Lunev3bd653c2008-10-08 10:54:51 -0700626 IP6_INC_STATS(net, ip6_dst_idev(skb->dst), IPSTATS_MIB_INHDRERRORS);
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700627 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
628 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629}
630
631static struct inet6_protocol frag_protocol =
632{
633 .handler = ipv6_frag_rcv,
634 .flags = INET6_PROTO_NOPOLICY,
635};
636
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800637#ifdef CONFIG_SYSCTL
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700638static struct ctl_table ip6_frags_ns_ctl_table[] = {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800639 {
640 .ctl_name = NET_IPV6_IP6FRAG_HIGH_THRESH,
641 .procname = "ip6frag_high_thresh",
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800642 .data = &init_net.ipv6.frags.high_thresh,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800643 .maxlen = sizeof(int),
644 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800645 .proc_handler = proc_dointvec
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800646 },
647 {
648 .ctl_name = NET_IPV6_IP6FRAG_LOW_THRESH,
649 .procname = "ip6frag_low_thresh",
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800650 .data = &init_net.ipv6.frags.low_thresh,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800651 .maxlen = sizeof(int),
652 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800653 .proc_handler = proc_dointvec
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800654 },
655 {
656 .ctl_name = NET_IPV6_IP6FRAG_TIME,
657 .procname = "ip6frag_time",
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800658 .data = &init_net.ipv6.frags.timeout,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800659 .maxlen = sizeof(int),
660 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800661 .proc_handler = proc_dointvec_jiffies,
662 .strategy = sysctl_jiffies,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800663 },
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700664 { }
665};
666
667static struct ctl_table ip6_frags_ctl_table[] = {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800668 {
669 .ctl_name = NET_IPV6_IP6FRAG_SECRET_INTERVAL,
670 .procname = "ip6frag_secret_interval",
Pavel Emelyanov3b4bc4a2008-01-22 06:11:04 -0800671 .data = &ip6_frags.secret_interval,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800672 .maxlen = sizeof(int),
673 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800674 .proc_handler = proc_dointvec_jiffies,
675 .strategy = sysctl_jiffies
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800676 },
677 { }
678};
Daniel Lezcano7d460db2008-01-18 23:52:35 -0800679
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700680static int ip6_frags_ns_sysctl_register(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800681{
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800682 struct ctl_table *table;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800683 struct ctl_table_header *hdr;
684
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700685 table = ip6_frags_ns_ctl_table;
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800686 if (net != &init_net) {
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700687 table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800688 if (table == NULL)
689 goto err_alloc;
690
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800691 table[0].data = &net->ipv6.frags.high_thresh;
692 table[1].data = &net->ipv6.frags.low_thresh;
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800693 table[2].data = &net->ipv6.frags.timeout;
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800694 }
695
696 hdr = register_net_sysctl_table(net, net_ipv6_ctl_path, table);
697 if (hdr == NULL)
698 goto err_reg;
699
700 net->ipv6.sysctl.frags_hdr = hdr;
701 return 0;
702
703err_reg:
704 if (net != &init_net)
705 kfree(table);
706err_alloc:
707 return -ENOMEM;
708}
709
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700710static void ip6_frags_ns_sysctl_unregister(struct net *net)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800711{
712 struct ctl_table *table;
713
714 table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
715 unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
716 kfree(table);
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800717}
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700718
719static struct ctl_table_header *ip6_ctl_header;
720
721static int ip6_frags_sysctl_register(void)
722{
723 ip6_ctl_header = register_net_sysctl_rotable(net_ipv6_ctl_path,
724 ip6_frags_ctl_table);
725 return ip6_ctl_header == NULL ? -ENOMEM : 0;
726}
727
728static void ip6_frags_sysctl_unregister(void)
729{
730 unregister_net_sysctl_table(ip6_ctl_header);
731}
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800732#else
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700733static inline int ip6_frags_ns_sysctl_register(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800734{
735 return 0;
736}
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800737
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700738static inline void ip6_frags_ns_sysctl_unregister(struct net *net)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800739{
740}
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700741
742static inline int ip6_frags_sysctl_register(void)
743{
744 return 0;
745}
746
747static inline void ip6_frags_sysctl_unregister(void)
748{
749}
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800750#endif
751
752static int ipv6_frags_init_net(struct net *net)
753{
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800754 net->ipv6.frags.high_thresh = 256 * 1024;
755 net->ipv6.frags.low_thresh = 192 * 1024;
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800756 net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800757
Pavel Emelyanove5a2bb8422008-01-22 06:06:23 -0800758 inet_frags_init_net(&net->ipv6.frags);
759
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700760 return ip6_frags_ns_sysctl_register(net);
Daniel Lezcanoe71e0342008-01-10 02:56:03 -0800761}
762
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800763static void ipv6_frags_exit_net(struct net *net)
764{
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700765 ip6_frags_ns_sysctl_unregister(net);
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800766 inet_frags_exit_net(&net->ipv6.frags, &ip6_frags);
767}
768
769static struct pernet_operations ip6_frags_ops = {
770 .init = ipv6_frags_init_net,
771 .exit = ipv6_frags_exit_net,
772};
773
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800774int __init ipv6_frag_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775{
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800776 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800778 ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
779 if (ret)
780 goto out;
Daniel Lezcanoe71e0342008-01-10 02:56:03 -0800781
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700782 ret = ip6_frags_sysctl_register();
783 if (ret)
784 goto err_sysctl;
785
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700786 ret = register_pernet_subsys(&ip6_frags_ops);
787 if (ret)
788 goto err_pernet;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800789
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700790 ip6_frags.hashfn = ip6_hashfn;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700791 ip6_frags.constructor = ip6_frag_init;
Pavel Emelyanovc9547702007-10-17 19:48:26 -0700792 ip6_frags.destructor = NULL;
Pavel Emelyanov1e4b8282007-10-15 02:39:14 -0700793 ip6_frags.skb_free = NULL;
794 ip6_frags.qsize = sizeof(struct frag_queue);
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700795 ip6_frags.match = ip6_frag_match;
Pavel Emelyanove521db92007-10-17 19:45:23 -0700796 ip6_frags.frag_expire = ip6_frag_expire;
Pavel Emelyanov3b4bc4a2008-01-22 06:11:04 -0800797 ip6_frags.secret_interval = 10 * 60 * HZ;
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700798 inet_frags_init(&ip6_frags);
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800799out:
800 return ret;
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700801
802err_pernet:
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700803 ip6_frags_sysctl_unregister();
804err_sysctl:
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700805 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
806 goto out;
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800807}
808
809void ipv6_frag_exit(void)
810{
811 inet_frags_fini(&ip6_frags);
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700812 ip6_frags_sysctl_unregister();
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800813 unregister_pernet_subsys(&ip6_frags_ops);
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800814 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815}