blob: 07beeb06f752da7cae16fb442d9d060624668275 [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090044#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46#include <net/sock.h>
47#include <net/snmp.h>
48
49#include <net/ipv6.h>
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +090050#include <net/ip6_route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <net/protocol.h>
52#include <net/transp_v6.h>
53#include <net/rawv6.h>
54#include <net/ndisc.h>
55#include <net/addrconf.h>
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -070056#include <net/inet_frag.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Linus Torvalds1da177e2005-04-16 15:20:36 -070058struct ip6frag_skb_cb
59{
60 struct inet6_skb_parm h;
61 int offset;
62};
63
64#define FRAG6_CB(skb) ((struct ip6frag_skb_cb*)((skb)->cb))
65
66
67/*
68 * Equivalent of ipv4 struct ipq
69 */
70
71struct frag_queue
72{
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -070073 struct inet_frag_queue q;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Al Viroe69a4adc2006-11-14 20:56:00 -080075 __be32 id; /* fragment id */
Patrick McHardy0b5ccb22009-12-15 16:59:18 +010076 u32 user;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 struct in6_addr saddr;
78 struct in6_addr daddr;
79
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 int iif;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 unsigned int csum;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 __u16 nhoffset;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083};
84
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070085static struct inet_frags ip6_frags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Pavel Emelyanove5a2bb82008-01-22 06:06:23 -080087int ip6_frag_nqueues(struct net *net)
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070088{
Pavel Emelyanove5a2bb82008-01-22 06:06:23 -080089 return net->ipv6.frags.nqueues;
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070090}
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -080092int ip6_frag_mem(struct net *net)
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070093{
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -080094 return atomic_read(&net->ipv6.frags.mem);
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070095}
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Herbert Xuf61944e2007-10-15 01:28:47 -070097static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
98 struct net_device *dev);
99
Zach Brownf6596f92006-04-10 16:05:34 -0700100/*
101 * callers should be careful not to use the hash value outside the ipfrag_lock
102 * as doing so could race with ipfrag_hash_rnd being recalculated.
103 */
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700104unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
105 const struct in6_addr *daddr, u32 rnd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106{
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +0000107 u32 c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +0000109 c = jhash_3words((__force u32)saddr->s6_addr32[0],
110 (__force u32)saddr->s6_addr32[1],
111 (__force u32)saddr->s6_addr32[2],
112 rnd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +0000114 c = jhash_3words((__force u32)saddr->s6_addr32[3],
115 (__force u32)daddr->s6_addr32[0],
116 (__force u32)daddr->s6_addr32[1],
117 c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +0000119 c = jhash_3words((__force u32)daddr->s6_addr32[2],
120 (__force u32)daddr->s6_addr32[3],
121 (__force u32)id,
122 c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700124 return c & (INETFRAGS_HASHSZ - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125}
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700126EXPORT_SYMBOL_GPL(inet6_hash_frag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700128static unsigned int ip6_hashfn(struct inet_frag_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129{
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700130 struct frag_queue *fq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700132 fq = container_of(q, struct frag_queue, q);
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700133 return inet6_hash_frag(fq->id, &fq->saddr, &fq->daddr, ip6_frags.rnd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134}
135
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700136int ip6_frag_match(struct inet_frag_queue *q, void *a)
137{
138 struct frag_queue *fq;
139 struct ip6_create_arg *arg = a;
140
141 fq = container_of(q, struct frag_queue, q);
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100142 return (fq->id == arg->id && fq->user == arg->user &&
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700143 ipv6_addr_equal(&fq->saddr, arg->src) &&
144 ipv6_addr_equal(&fq->daddr, arg->dst));
145}
146EXPORT_SYMBOL(ip6_frag_match);
147
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700148void ip6_frag_init(struct inet_frag_queue *q, void *a)
149{
150 struct frag_queue *fq = container_of(q, struct frag_queue, q);
151 struct ip6_create_arg *arg = a;
152
153 fq->id = arg->id;
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100154 fq->user = arg->user;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700155 ipv6_addr_copy(&fq->saddr, arg->src);
156 ipv6_addr_copy(&fq->daddr, arg->dst);
157}
158EXPORT_SYMBOL(ip6_frag_init);
159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160/* Destruction primitives. */
161
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700162static __inline__ void fq_put(struct frag_queue *fq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163{
Pavel Emelyanov762cc402007-10-15 02:41:56 -0700164 inet_frag_put(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165}
166
167/* Kill fq entry. It is not destroyed immediately,
168 * because caller (and someone more) holds reference count.
169 */
170static __inline__ void fq_kill(struct frag_queue *fq)
171{
Pavel Emelyanov277e6502007-10-15 02:37:18 -0700172 inet_frag_kill(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173}
174
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800175static void ip6_evictor(struct net *net, struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176{
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700177 int evicted;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800179 evicted = inet_frag_evictor(&net->ipv6.frags, &ip6_frags);
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700180 if (evicted)
Denis V. Lunev821d5772008-10-08 10:32:43 -0700181 IP6_ADD_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS, evicted);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182}
183
184static void ip6_frag_expire(unsigned long data)
185{
Pavel Emelyanove521db92007-10-17 19:45:23 -0700186 struct frag_queue *fq;
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900187 struct net_device *dev = NULL;
Daniel Lezcano4ac2ccd2008-05-02 17:02:03 -0700188 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
Pavel Emelyanove521db92007-10-17 19:45:23 -0700190 fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
191
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700192 spin_lock(&fq->q.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Joe Perchesbc578a52008-03-28 16:35:27 -0700194 if (fq->q.last_in & INET_FRAG_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 goto out;
196
197 fq_kill(fq);
198
Daniel Lezcano4ac2ccd2008-05-02 17:02:03 -0700199 net = container_of(fq->q.net, struct net, ipv6.frags);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900200 rcu_read_lock();
Eric Dumazet69df9d52009-11-05 20:59:47 -0800201 dev = dev_get_by_index_rcu(net, fq->iif);
202 if (!dev)
203 goto out_rcu_unlock;
204
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700205 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
206 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
Ingo Oeser78c784c2006-03-20 23:01:17 -0800208 /* Don't send error if the first segment did not arrive. */
Joe Perchesbc578a52008-03-28 16:35:27 -0700209 if (!(fq->q.last_in & INET_FRAG_FIRST_IN) || !fq->q.fragments)
Eric Dumazet69df9d52009-11-05 20:59:47 -0800210 goto out_rcu_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
Ingo Oeser78c784c2006-03-20 23:01:17 -0800212 /*
213 But use as source device on which LAST ARRIVED
214 segment was received. And do not use fq->dev
215 pointer directly, device might already disappeared.
216 */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700217 fq->q.fragments->dev = dev;
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000218 icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0);
Eric Dumazet69df9d52009-11-05 20:59:47 -0800219out_rcu_unlock:
220 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221out:
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700222 spin_unlock(&fq->q.lock);
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700223 fq_put(fq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224}
225
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700226static __inline__ struct frag_queue *
Shan Wei95463772010-02-11 00:12:45 +0000227fq_find(struct net *net, __be32 id, struct in6_addr *src, struct in6_addr *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228{
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700229 struct inet_frag_queue *q;
230 struct ip6_create_arg arg;
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700231 unsigned int hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700233 arg.id = id;
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100234 arg.user = IP6_DEFRAG_LOCAL_DELIVER;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700235 arg.src = src;
236 arg.dst = dst;
Pavel Emelyanov9a375802008-06-27 20:06:08 -0700237
238 read_lock(&ip6_frags.lock);
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700239 hash = inet6_hash_frag(id, src, dst, ip6_frags.rnd);
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700240
Pavel Emelyanovac18e752008-01-22 06:02:14 -0800241 q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash);
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700242 if (q == NULL)
Shan Wei95463772010-02-11 00:12:45 +0000243 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700245 return container_of(q, struct frag_queue, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246}
247
Herbert Xuf61944e2007-10-15 01:28:47 -0700248static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 struct frag_hdr *fhdr, int nhoff)
250{
251 struct sk_buff *prev, *next;
Herbert Xuf61944e2007-10-15 01:28:47 -0700252 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 int offset, end;
Eric Dumazetadf30902009-06-02 05:19:30 +0000254 struct net *net = dev_net(skb_dst(skb)->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
Joe Perchesbc578a52008-03-28 16:35:27 -0700256 if (fq->q.last_in & INET_FRAG_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 goto err;
258
259 offset = ntohs(fhdr->frag_off) & ~0x7;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700260 end = offset + (ntohs(ipv6_hdr(skb)->payload_len) -
261 ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
263 if ((unsigned int)end > IPV6_MAXPLEN) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000264 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900265 IPSTATS_MIB_INHDRERRORS);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700266 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
267 ((u8 *)&fhdr->frag_off -
268 skb_network_header(skb)));
Herbert Xuf61944e2007-10-15 01:28:47 -0700269 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 }
271
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700272 if (skb->ip_summed == CHECKSUM_COMPLETE) {
273 const unsigned char *nh = skb_network_header(skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900274 skb->csum = csum_sub(skb->csum,
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700275 csum_partial(nh, (u8 *)(fhdr + 1) - nh,
276 0));
277 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
279 /* Is this the final fragment? */
280 if (!(fhdr->frag_off & htons(IP6_MF))) {
281 /* If we already have some bits beyond end
282 * or have different end, the segment is corrupted.
283 */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700284 if (end < fq->q.len ||
Joe Perchesbc578a52008-03-28 16:35:27 -0700285 ((fq->q.last_in & INET_FRAG_LAST_IN) && end != fq->q.len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 goto err;
Joe Perchesbc578a52008-03-28 16:35:27 -0700287 fq->q.last_in |= INET_FRAG_LAST_IN;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700288 fq->q.len = end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 } else {
290 /* Check if the fragment is rounded to 8 bytes.
291 * Required by the RFC.
292 */
293 if (end & 0x7) {
294 /* RFC2460 says always send parameter problem in
295 * this case. -DaveM
296 */
Eric Dumazetadf30902009-06-02 05:19:30 +0000297 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900298 IPSTATS_MIB_INHDRERRORS);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900299 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 offsetof(struct ipv6hdr, payload_len));
Herbert Xuf61944e2007-10-15 01:28:47 -0700301 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 }
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700303 if (end > fq->q.len) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 /* Some bits beyond end -> corruption. */
Joe Perchesbc578a52008-03-28 16:35:27 -0700305 if (fq->q.last_in & INET_FRAG_LAST_IN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 goto err;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700307 fq->q.len = end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 }
309 }
310
311 if (end == offset)
312 goto err;
313
314 /* Point into the IP datagram 'data' part. */
315 if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data))
316 goto err;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900317
Stephen Hemminger42ca89c2005-09-08 12:57:43 -0700318 if (pskb_trim_rcsum(skb, end - offset))
319 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
321 /* Find out which fragments are in front and at the back of us
322 * in the chain of fragments so far. We must know where to put
323 * this fragment, right?
324 */
Changli Gaod6bebca2010-06-29 04:39:37 +0000325 prev = fq->q.fragments_tail;
326 if (!prev || FRAG6_CB(prev)->offset < offset) {
327 next = NULL;
328 goto found;
329 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 prev = NULL;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700331 for(next = fq->q.fragments; next != NULL; next = next->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 if (FRAG6_CB(next)->offset >= offset)
333 break; /* bingo! */
334 prev = next;
335 }
336
Changli Gaod6bebca2010-06-29 04:39:37 +0000337found:
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000338 /* RFC5722, Section 4:
339 * When reassembling an IPv6 datagram, if
340 * one or more its constituent fragments is determined to be an
341 * overlapping fragment, the entire datagram (and any constituent
342 * fragments, including those not yet received) MUST be silently
343 * discarded.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000346 /* Check for overlap with preceding fragment. */
347 if (prev &&
Shan Weif4642142010-11-05 01:56:34 +0000348 (FRAG6_CB(prev)->offset + prev->len) > offset)
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000349 goto discard_fq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000351 /* Look for overlap with succeeding segment. */
352 if (next && FRAG6_CB(next)->offset < end)
353 goto discard_fq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355 FRAG6_CB(skb)->offset = offset;
356
357 /* Insert this fragment in the chain of fragments. */
358 skb->next = next;
Changli Gaod6bebca2010-06-29 04:39:37 +0000359 if (!next)
360 fq->q.fragments_tail = skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 if (prev)
362 prev->next = skb;
363 else
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700364 fq->q.fragments = skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Herbert Xuf61944e2007-10-15 01:28:47 -0700366 dev = skb->dev;
367 if (dev) {
368 fq->iif = dev->ifindex;
369 skb->dev = NULL;
370 }
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700371 fq->q.stamp = skb->tstamp;
372 fq->q.meat += skb->len;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800373 atomic_add(skb->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374
375 /* The first fragment.
376 * nhoffset is obtained from the first fragment, of course.
377 */
378 if (offset == 0) {
379 fq->nhoffset = nhoff;
Joe Perchesbc578a52008-03-28 16:35:27 -0700380 fq->q.last_in |= INET_FRAG_FIRST_IN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 }
Herbert Xuf61944e2007-10-15 01:28:47 -0700382
Joe Perchesbc578a52008-03-28 16:35:27 -0700383 if (fq->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
384 fq->q.meat == fq->q.len)
Herbert Xuf61944e2007-10-15 01:28:47 -0700385 return ip6_frag_reasm(fq, prev, dev);
386
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700387 write_lock(&ip6_frags.lock);
Pavel Emelyanov3140c252008-01-22 06:11:48 -0800388 list_move_tail(&fq->q.lru_list, &fq->q.net->lru_list);
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700389 write_unlock(&ip6_frags.lock);
Herbert Xuf61944e2007-10-15 01:28:47 -0700390 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000392discard_fq:
393 fq_kill(fq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394err:
Eric Dumazetadf30902009-06-02 05:19:30 +0000395 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
Denis V. Lunev3bd653c2008-10-08 10:54:51 -0700396 IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 kfree_skb(skb);
Herbert Xuf61944e2007-10-15 01:28:47 -0700398 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399}
400
401/*
402 * Check if this packet is complete.
403 * Returns NULL on failure by any reason, and pointer
404 * to current nexthdr field in reassembled frame.
405 *
406 * It is called with locked fq, and caller must check that
407 * queue is eligible for reassembly i.e. it is not COMPLETE,
408 * the last and the first frames arrived and all the bits are here.
409 */
Herbert Xuf61944e2007-10-15 01:28:47 -0700410static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 struct net_device *dev)
412{
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700413 struct net *net = container_of(fq->q.net, struct net, ipv6.frags);
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700414 struct sk_buff *fp, *head = fq->q.fragments;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 int payload_len;
416 unsigned int nhoff;
417
418 fq_kill(fq);
419
Herbert Xuf61944e2007-10-15 01:28:47 -0700420 /* Make the one we just received the head. */
421 if (prev) {
422 head = prev->next;
423 fp = skb_clone(head, GFP_ATOMIC);
424
425 if (!fp)
426 goto out_oom;
427
428 fp->next = head->next;
Changli Gaod6bebca2010-06-29 04:39:37 +0000429 if (!fp->next)
430 fq->q.fragments_tail = fp;
Herbert Xuf61944e2007-10-15 01:28:47 -0700431 prev->next = fp;
432
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700433 skb_morph(head, fq->q.fragments);
434 head->next = fq->q.fragments->next;
Herbert Xuf61944e2007-10-15 01:28:47 -0700435
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700436 kfree_skb(fq->q.fragments);
437 fq->q.fragments = head;
Herbert Xuf61944e2007-10-15 01:28:47 -0700438 }
439
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700440 WARN_ON(head == NULL);
441 WARN_ON(FRAG6_CB(head)->offset != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
443 /* Unfragmented part is taken from the first segment. */
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700444 payload_len = ((head->data - skb_network_header(head)) -
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700445 sizeof(struct ipv6hdr) + fq->q.len -
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700446 sizeof(struct frag_hdr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 if (payload_len > IPV6_MAXPLEN)
448 goto out_oversize;
449
450 /* Head of list must not be cloned. */
451 if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC))
452 goto out_oom;
453
454 /* If the first fragment is fragmented itself, we split
455 * it to two chunks: the first with data and paged part
456 * and the second, holding only fragments. */
David S. Miller21dc3302010-08-23 00:13:46 -0700457 if (skb_has_frag_list(head)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 struct sk_buff *clone;
459 int i, plen = 0;
460
461 if ((clone = alloc_skb(0, GFP_ATOMIC)) == NULL)
462 goto out_oom;
463 clone->next = head->next;
464 head->next = clone;
465 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
David S. Miller4d9092b2009-06-09 00:20:05 -0700466 skb_frag_list_init(head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 for (i=0; i<skb_shinfo(head)->nr_frags; i++)
468 plen += skb_shinfo(head)->frags[i].size;
469 clone->len = clone->data_len = head->data_len - plen;
470 head->data_len -= clone->len;
471 head->len -= clone->len;
472 clone->csum = 0;
473 clone->ip_summed = head->ip_summed;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800474 atomic_add(clone->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 }
476
477 /* We have to remove fragment header from datagram and to relocate
478 * header in order to calculate ICV correctly. */
479 nhoff = fq->nhoffset;
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700480 skb_network_header(head)[nhoff] = skb_transport_header(head)[0];
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900481 memmove(head->head + sizeof(struct frag_hdr), head->head,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 (head->data - head->head) - sizeof(struct frag_hdr));
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700483 head->mac_header += sizeof(struct frag_hdr);
484 head->network_header += sizeof(struct frag_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486 skb_shinfo(head)->frag_list = head->next;
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300487 skb_reset_transport_header(head);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700488 skb_push(head, head->data - skb_network_header(head));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489
490 for (fp=head->next; fp; fp = fp->next) {
491 head->data_len += fp->len;
492 head->len += fp->len;
493 if (head->ip_summed != fp->ip_summed)
494 head->ip_summed = CHECKSUM_NONE;
Patrick McHardy84fa7932006-08-29 16:44:56 -0700495 else if (head->ip_summed == CHECKSUM_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 head->csum = csum_add(head->csum, fp->csum);
497 head->truesize += fp->truesize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 }
Eric Dumazetd27f9b32010-06-13 23:02:24 +0000499 atomic_sub(head->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500
501 head->next = NULL;
502 head->dev = dev;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700503 head->tstamp = fq->q.stamp;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700504 ipv6_hdr(head)->payload_len = htons(payload_len);
Patrick McHardy951dbc82006-01-06 23:02:34 -0800505 IP6CB(head)->nhoff = nhoff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 /* Yes, and fold redundant checksum back. 8) */
Patrick McHardy84fa7932006-08-29 16:44:56 -0700508 if (head->ip_summed == CHECKSUM_COMPLETE)
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700509 head->csum = csum_partial(skb_network_header(head),
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300510 skb_network_header_len(head),
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700511 head->csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900513 rcu_read_lock();
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700514 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900515 rcu_read_unlock();
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700516 fq->q.fragments = NULL;
Changli Gaod6bebca2010-06-29 04:39:37 +0000517 fq->q.fragments_tail = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 return 1;
519
520out_oversize:
521 if (net_ratelimit())
522 printk(KERN_DEBUG "ip6_frag_reasm: payload len = %d\n", payload_len);
523 goto out_fail;
524out_oom:
525 if (net_ratelimit())
526 printk(KERN_DEBUG "ip6_frag_reasm: no memory for reassembly\n");
527out_fail:
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900528 rcu_read_lock();
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700529 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900530 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 return -1;
532}
533
Herbert Xue5bbef22007-10-15 12:50:28 -0700534static int ipv6_frag_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 struct frag_hdr *fhdr;
537 struct frag_queue *fq;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700538 struct ipv6hdr *hdr = ipv6_hdr(skb);
Eric Dumazetadf30902009-06-02 05:19:30 +0000539 struct net *net = dev_net(skb_dst(skb)->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
Eric Dumazetadf30902009-06-02 05:19:30 +0000541 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
543 /* Jumbo payload inhibits frag. header */
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700544 if (hdr->payload_len==0)
545 goto fail_hdr;
546
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700547 if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700548 sizeof(struct frag_hdr))))
549 goto fail_hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700551 hdr = ipv6_hdr(skb);
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700552 fhdr = (struct frag_hdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553
554 if (!(fhdr->frag_off & htons(0xFFF9))) {
555 /* It is not a fragmented frame */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700556 skb->transport_header += sizeof(struct frag_hdr);
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700557 IP6_INC_STATS_BH(net,
Eric Dumazetadf30902009-06-02 05:19:30 +0000558 ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700560 IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 return 1;
562 }
563
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800564 if (atomic_read(&net->ipv6.frags.mem) > net->ipv6.frags.high_thresh)
Eric Dumazetadf30902009-06-02 05:19:30 +0000565 ip6_evictor(net, ip6_dst_idev(skb_dst(skb)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
Shan Wei95463772010-02-11 00:12:45 +0000567 fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr);
568 if (fq != NULL) {
Herbert Xuf61944e2007-10-15 01:28:47 -0700569 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700571 spin_lock(&fq->q.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
Herbert Xuf61944e2007-10-15 01:28:47 -0700573 ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700575 spin_unlock(&fq->q.lock);
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700576 fq_put(fq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 return ret;
578 }
579
Eric Dumazetadf30902009-06-02 05:19:30 +0000580 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 kfree_skb(skb);
582 return -1;
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700583
584fail_hdr:
Eric Dumazetadf30902009-06-02 05:19:30 +0000585 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS);
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700586 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
587 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588}
589
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000590static const struct inet6_protocol frag_protocol =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591{
592 .handler = ipv6_frag_rcv,
593 .flags = INET6_PROTO_NOPOLICY,
594};
595
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800596#ifdef CONFIG_SYSCTL
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700597static struct ctl_table ip6_frags_ns_ctl_table[] = {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800598 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800599 .procname = "ip6frag_high_thresh",
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800600 .data = &init_net.ipv6.frags.high_thresh,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800601 .maxlen = sizeof(int),
602 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800603 .proc_handler = proc_dointvec
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800604 },
605 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800606 .procname = "ip6frag_low_thresh",
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800607 .data = &init_net.ipv6.frags.low_thresh,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800608 .maxlen = sizeof(int),
609 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800610 .proc_handler = proc_dointvec
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800611 },
612 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800613 .procname = "ip6frag_time",
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800614 .data = &init_net.ipv6.frags.timeout,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800615 .maxlen = sizeof(int),
616 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800617 .proc_handler = proc_dointvec_jiffies,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800618 },
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700619 { }
620};
621
622static struct ctl_table ip6_frags_ctl_table[] = {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800623 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800624 .procname = "ip6frag_secret_interval",
Pavel Emelyanov3b4bc4a2008-01-22 06:11:04 -0800625 .data = &ip6_frags.secret_interval,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800626 .maxlen = sizeof(int),
627 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800628 .proc_handler = proc_dointvec_jiffies,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800629 },
630 { }
631};
Daniel Lezcano7d460db2008-01-18 23:52:35 -0800632
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000633static int __net_init ip6_frags_ns_sysctl_register(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800634{
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800635 struct ctl_table *table;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800636 struct ctl_table_header *hdr;
637
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700638 table = ip6_frags_ns_ctl_table;
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800639 if (!net_eq(net, &init_net)) {
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700640 table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800641 if (table == NULL)
642 goto err_alloc;
643
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800644 table[0].data = &net->ipv6.frags.high_thresh;
645 table[1].data = &net->ipv6.frags.low_thresh;
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800646 table[2].data = &net->ipv6.frags.timeout;
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800647 }
648
649 hdr = register_net_sysctl_table(net, net_ipv6_ctl_path, table);
650 if (hdr == NULL)
651 goto err_reg;
652
653 net->ipv6.sysctl.frags_hdr = hdr;
654 return 0;
655
656err_reg:
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800657 if (!net_eq(net, &init_net))
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800658 kfree(table);
659err_alloc:
660 return -ENOMEM;
661}
662
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000663static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800664{
665 struct ctl_table *table;
666
667 table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
668 unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
Yang Hongyang3705e112009-12-18 20:25:13 -0800669 if (!net_eq(net, &init_net))
670 kfree(table);
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800671}
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700672
673static struct ctl_table_header *ip6_ctl_header;
674
675static int ip6_frags_sysctl_register(void)
676{
677 ip6_ctl_header = register_net_sysctl_rotable(net_ipv6_ctl_path,
678 ip6_frags_ctl_table);
679 return ip6_ctl_header == NULL ? -ENOMEM : 0;
680}
681
682static void ip6_frags_sysctl_unregister(void)
683{
684 unregister_net_sysctl_table(ip6_ctl_header);
685}
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800686#else
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700687static inline int ip6_frags_ns_sysctl_register(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800688{
689 return 0;
690}
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800691
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700692static inline void ip6_frags_ns_sysctl_unregister(struct net *net)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800693{
694}
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700695
696static inline int ip6_frags_sysctl_register(void)
697{
698 return 0;
699}
700
701static inline void ip6_frags_sysctl_unregister(void)
702{
703}
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800704#endif
705
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000706static int __net_init ipv6_frags_init_net(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800707{
Shan Wei7c070aa2010-01-20 10:42:41 +0100708 net->ipv6.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
709 net->ipv6.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800710 net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800711
Pavel Emelyanove5a2bb82008-01-22 06:06:23 -0800712 inet_frags_init_net(&net->ipv6.frags);
713
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700714 return ip6_frags_ns_sysctl_register(net);
Daniel Lezcanoe71e0342008-01-10 02:56:03 -0800715}
716
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000717static void __net_exit ipv6_frags_exit_net(struct net *net)
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800718{
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700719 ip6_frags_ns_sysctl_unregister(net);
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800720 inet_frags_exit_net(&net->ipv6.frags, &ip6_frags);
721}
722
723static struct pernet_operations ip6_frags_ops = {
724 .init = ipv6_frags_init_net,
725 .exit = ipv6_frags_exit_net,
726};
727
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800728int __init ipv6_frag_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729{
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800730 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800732 ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
733 if (ret)
734 goto out;
Daniel Lezcanoe71e0342008-01-10 02:56:03 -0800735
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700736 ret = ip6_frags_sysctl_register();
737 if (ret)
738 goto err_sysctl;
739
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700740 ret = register_pernet_subsys(&ip6_frags_ops);
741 if (ret)
742 goto err_pernet;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800743
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700744 ip6_frags.hashfn = ip6_hashfn;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700745 ip6_frags.constructor = ip6_frag_init;
Pavel Emelyanovc9547702007-10-17 19:48:26 -0700746 ip6_frags.destructor = NULL;
Pavel Emelyanov1e4b8282007-10-15 02:39:14 -0700747 ip6_frags.skb_free = NULL;
748 ip6_frags.qsize = sizeof(struct frag_queue);
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700749 ip6_frags.match = ip6_frag_match;
Pavel Emelyanove521db92007-10-17 19:45:23 -0700750 ip6_frags.frag_expire = ip6_frag_expire;
Pavel Emelyanov3b4bc4a2008-01-22 06:11:04 -0800751 ip6_frags.secret_interval = 10 * 60 * HZ;
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700752 inet_frags_init(&ip6_frags);
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800753out:
754 return ret;
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700755
756err_pernet:
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700757 ip6_frags_sysctl_unregister();
758err_sysctl:
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700759 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
760 goto out;
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800761}
762
763void ipv6_frag_exit(void)
764{
765 inet_frags_fini(&ip6_frags);
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700766 ip6_frags_sysctl_unregister();
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800767 unregister_pernet_subsys(&ip6_frags_ops);
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800768 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769}