blob: 6d4292ff585463178885153cdd2fe6e044b962a9 [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 Viroe69a4ad2006-11-14 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 Emelyanove5a2bb8422008-01-22 06:06:23 -080087int ip6_frag_nqueues(struct net *net)
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070088{
Pavel Emelyanove5a2bb8422008-01-22 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{
107 u32 a, b, c;
108
Al Viroe69a4ad2006-11-14 20:56:00 -0800109 a = (__force u32)saddr->s6_addr32[0];
110 b = (__force u32)saddr->s6_addr32[1];
111 c = (__force u32)saddr->s6_addr32[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113 a += JHASH_GOLDEN_RATIO;
114 b += JHASH_GOLDEN_RATIO;
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700115 c += rnd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 __jhash_mix(a, b, c);
117
Al Viroe69a4ad2006-11-14 20:56:00 -0800118 a += (__force u32)saddr->s6_addr32[3];
119 b += (__force u32)daddr->s6_addr32[0];
120 c += (__force u32)daddr->s6_addr32[1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 __jhash_mix(a, b, c);
122
Al Viroe69a4ad2006-11-14 20:56:00 -0800123 a += (__force u32)daddr->s6_addr32[2];
124 b += (__force u32)daddr->s6_addr32[3];
125 c += (__force u32)id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 __jhash_mix(a, b, c);
127
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700128 return c & (INETFRAGS_HASHSZ - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129}
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700130EXPORT_SYMBOL_GPL(inet6_hash_frag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700132static unsigned int ip6_hashfn(struct inet_frag_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700134 struct frag_queue *fq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700136 fq = container_of(q, struct frag_queue, q);
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700137 return inet6_hash_frag(fq->id, &fq->saddr, &fq->daddr, ip6_frags.rnd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138}
139
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700140int ip6_frag_match(struct inet_frag_queue *q, void *a)
141{
142 struct frag_queue *fq;
143 struct ip6_create_arg *arg = a;
144
145 fq = container_of(q, struct frag_queue, q);
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100146 return (fq->id == arg->id && fq->user == arg->user &&
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700147 ipv6_addr_equal(&fq->saddr, arg->src) &&
148 ipv6_addr_equal(&fq->daddr, arg->dst));
149}
150EXPORT_SYMBOL(ip6_frag_match);
151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152/* Memory Tracking Functions. */
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800153static inline void frag_kfree_skb(struct netns_frags *nf,
154 struct sk_buff *skb, int *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155{
156 if (work)
157 *work -= skb->truesize;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800158 atomic_sub(skb->truesize, &nf->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 kfree_skb(skb);
160}
161
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700162void ip6_frag_init(struct inet_frag_queue *q, void *a)
163{
164 struct frag_queue *fq = container_of(q, struct frag_queue, q);
165 struct ip6_create_arg *arg = a;
166
167 fq->id = arg->id;
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100168 fq->user = arg->user;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700169 ipv6_addr_copy(&fq->saddr, arg->src);
170 ipv6_addr_copy(&fq->daddr, arg->dst);
171}
172EXPORT_SYMBOL(ip6_frag_init);
173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174/* Destruction primitives. */
175
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700176static __inline__ void fq_put(struct frag_queue *fq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
Pavel Emelyanov762cc402007-10-15 02:41:56 -0700178 inet_frag_put(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179}
180
181/* Kill fq entry. It is not destroyed immediately,
182 * because caller (and someone more) holds reference count.
183 */
184static __inline__ void fq_kill(struct frag_queue *fq)
185{
Pavel Emelyanov277e6502007-10-15 02:37:18 -0700186 inet_frag_kill(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187}
188
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800189static void ip6_evictor(struct net *net, struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700191 int evicted;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800193 evicted = inet_frag_evictor(&net->ipv6.frags, &ip6_frags);
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700194 if (evicted)
Denis V. Lunev821d5772008-10-08 10:32:43 -0700195 IP6_ADD_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS, evicted);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196}
197
198static void ip6_frag_expire(unsigned long data)
199{
Pavel Emelyanove521db92007-10-17 19:45:23 -0700200 struct frag_queue *fq;
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900201 struct net_device *dev = NULL;
Daniel Lezcano4ac2ccd2008-05-02 17:02:03 -0700202 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Pavel Emelyanove521db92007-10-17 19:45:23 -0700204 fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
205
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700206 spin_lock(&fq->q.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
Joe Perchesbc578a52008-03-28 16:35:27 -0700208 if (fq->q.last_in & INET_FRAG_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 goto out;
210
211 fq_kill(fq);
212
Daniel Lezcano4ac2ccd2008-05-02 17:02:03 -0700213 net = container_of(fq->q.net, struct net, ipv6.frags);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900214 rcu_read_lock();
Eric Dumazet69df9d52009-11-05 20:59:47 -0800215 dev = dev_get_by_index_rcu(net, fq->iif);
216 if (!dev)
217 goto out_rcu_unlock;
218
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700219 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
220 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Ingo Oeser78c784c2006-03-20 23:01:17 -0800222 /* Don't send error if the first segment did not arrive. */
Joe Perchesbc578a52008-03-28 16:35:27 -0700223 if (!(fq->q.last_in & INET_FRAG_FIRST_IN) || !fq->q.fragments)
Eric Dumazet69df9d52009-11-05 20:59:47 -0800224 goto out_rcu_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
Ingo Oeser78c784c2006-03-20 23:01:17 -0800226 /*
227 But use as source device on which LAST ARRIVED
228 segment was received. And do not use fq->dev
229 pointer directly, device might already disappeared.
230 */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700231 fq->q.fragments->dev = dev;
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000232 icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0);
Eric Dumazet69df9d52009-11-05 20:59:47 -0800233out_rcu_unlock:
234 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235out:
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700236 spin_unlock(&fq->q.lock);
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700237 fq_put(fq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238}
239
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700240static __inline__ struct frag_queue *
Shan Wei95463772010-02-11 00:12:45 +0000241fq_find(struct net *net, __be32 id, struct in6_addr *src, struct in6_addr *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242{
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700243 struct inet_frag_queue *q;
244 struct ip6_create_arg arg;
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700245 unsigned int hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700247 arg.id = id;
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100248 arg.user = IP6_DEFRAG_LOCAL_DELIVER;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700249 arg.src = src;
250 arg.dst = dst;
Pavel Emelyanov9a375802008-06-27 20:06:08 -0700251
252 read_lock(&ip6_frags.lock);
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700253 hash = inet6_hash_frag(id, src, dst, ip6_frags.rnd);
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700254
Pavel Emelyanovac18e752008-01-22 06:02:14 -0800255 q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash);
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700256 if (q == NULL)
Shan Wei95463772010-02-11 00:12:45 +0000257 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700259 return container_of(q, struct frag_queue, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260}
261
Herbert Xuf61944e2007-10-15 01:28:47 -0700262static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 struct frag_hdr *fhdr, int nhoff)
264{
265 struct sk_buff *prev, *next;
Herbert Xuf61944e2007-10-15 01:28:47 -0700266 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 int offset, end;
Eric Dumazetadf30902009-06-02 05:19:30 +0000268 struct net *net = dev_net(skb_dst(skb)->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
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) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000278 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900279 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 */
Eric Dumazetadf30902009-06-02 05:19:30 +0000311 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900312 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:
Eric Dumazetadf30902009-06-02 05:19:30 +0000435 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
Denis V. Lunev3bd653c2008-10-08 10:54:51 -0700436 IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 kfree_skb(skb);
Herbert Xuf61944e2007-10-15 01:28:47 -0700438 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439}
440
441/*
442 * Check if this packet is complete.
443 * Returns NULL on failure by any reason, and pointer
444 * to current nexthdr field in reassembled frame.
445 *
446 * It is called with locked fq, and caller must check that
447 * queue is eligible for reassembly i.e. it is not COMPLETE,
448 * the last and the first frames arrived and all the bits are here.
449 */
Herbert Xuf61944e2007-10-15 01:28:47 -0700450static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 struct net_device *dev)
452{
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700453 struct net *net = container_of(fq->q.net, struct net, ipv6.frags);
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700454 struct sk_buff *fp, *head = fq->q.fragments;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 int payload_len;
456 unsigned int nhoff;
457
458 fq_kill(fq);
459
Herbert Xuf61944e2007-10-15 01:28:47 -0700460 /* Make the one we just received the head. */
461 if (prev) {
462 head = prev->next;
463 fp = skb_clone(head, GFP_ATOMIC);
464
465 if (!fp)
466 goto out_oom;
467
468 fp->next = head->next;
469 prev->next = fp;
470
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700471 skb_morph(head, fq->q.fragments);
472 head->next = fq->q.fragments->next;
Herbert Xuf61944e2007-10-15 01:28:47 -0700473
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700474 kfree_skb(fq->q.fragments);
475 fq->q.fragments = head;
Herbert Xuf61944e2007-10-15 01:28:47 -0700476 }
477
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700478 WARN_ON(head == NULL);
479 WARN_ON(FRAG6_CB(head)->offset != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
481 /* Unfragmented part is taken from the first segment. */
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700482 payload_len = ((head->data - skb_network_header(head)) -
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700483 sizeof(struct ipv6hdr) + fq->q.len -
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700484 sizeof(struct frag_hdr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 if (payload_len > IPV6_MAXPLEN)
486 goto out_oversize;
487
488 /* Head of list must not be cloned. */
489 if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC))
490 goto out_oom;
491
492 /* If the first fragment is fragmented itself, we split
493 * it to two chunks: the first with data and paged part
494 * and the second, holding only fragments. */
David S. Miller4d9092b2009-06-09 00:20:05 -0700495 if (skb_has_frags(head)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 struct sk_buff *clone;
497 int i, plen = 0;
498
499 if ((clone = alloc_skb(0, GFP_ATOMIC)) == NULL)
500 goto out_oom;
501 clone->next = head->next;
502 head->next = clone;
503 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
David S. Miller4d9092b2009-06-09 00:20:05 -0700504 skb_frag_list_init(head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 for (i=0; i<skb_shinfo(head)->nr_frags; i++)
506 plen += skb_shinfo(head)->frags[i].size;
507 clone->len = clone->data_len = head->data_len - plen;
508 head->data_len -= clone->len;
509 head->len -= clone->len;
510 clone->csum = 0;
511 clone->ip_summed = head->ip_summed;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800512 atomic_add(clone->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 }
514
515 /* We have to remove fragment header from datagram and to relocate
516 * header in order to calculate ICV correctly. */
517 nhoff = fq->nhoffset;
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700518 skb_network_header(head)[nhoff] = skb_transport_header(head)[0];
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900519 memmove(head->head + sizeof(struct frag_hdr), head->head,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 (head->data - head->head) - sizeof(struct frag_hdr));
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700521 head->mac_header += sizeof(struct frag_hdr);
522 head->network_header += sizeof(struct frag_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
524 skb_shinfo(head)->frag_list = head->next;
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300525 skb_reset_transport_header(head);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700526 skb_push(head, head->data - skb_network_header(head));
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800527 atomic_sub(head->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
529 for (fp=head->next; fp; fp = fp->next) {
530 head->data_len += fp->len;
531 head->len += fp->len;
532 if (head->ip_summed != fp->ip_summed)
533 head->ip_summed = CHECKSUM_NONE;
Patrick McHardy84fa7932006-08-29 16:44:56 -0700534 else if (head->ip_summed == CHECKSUM_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 head->csum = csum_add(head->csum, fp->csum);
536 head->truesize += fp->truesize;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800537 atomic_sub(fp->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 }
539
540 head->next = NULL;
541 head->dev = dev;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700542 head->tstamp = fq->q.stamp;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700543 ipv6_hdr(head)->payload_len = htons(payload_len);
Patrick McHardy951dbc82006-01-06 23:02:34 -0800544 IP6CB(head)->nhoff = nhoff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 /* Yes, and fold redundant checksum back. 8) */
Patrick McHardy84fa7932006-08-29 16:44:56 -0700547 if (head->ip_summed == CHECKSUM_COMPLETE)
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700548 head->csum = csum_partial(skb_network_header(head),
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300549 skb_network_header_len(head),
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700550 head->csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900552 rcu_read_lock();
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700553 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900554 rcu_read_unlock();
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700555 fq->q.fragments = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 return 1;
557
558out_oversize:
559 if (net_ratelimit())
560 printk(KERN_DEBUG "ip6_frag_reasm: payload len = %d\n", payload_len);
561 goto out_fail;
562out_oom:
563 if (net_ratelimit())
564 printk(KERN_DEBUG "ip6_frag_reasm: no memory for reassembly\n");
565out_fail:
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900566 rcu_read_lock();
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700567 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900568 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 return -1;
570}
571
Herbert Xue5bbef22007-10-15 12:50:28 -0700572static int ipv6_frag_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 struct frag_hdr *fhdr;
575 struct frag_queue *fq;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700576 struct ipv6hdr *hdr = ipv6_hdr(skb);
Eric Dumazetadf30902009-06-02 05:19:30 +0000577 struct net *net = dev_net(skb_dst(skb)->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
Eric Dumazetadf30902009-06-02 05:19:30 +0000579 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
581 /* Jumbo payload inhibits frag. header */
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700582 if (hdr->payload_len==0)
583 goto fail_hdr;
584
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700585 if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700586 sizeof(struct frag_hdr))))
587 goto fail_hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700589 hdr = ipv6_hdr(skb);
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700590 fhdr = (struct frag_hdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591
592 if (!(fhdr->frag_off & htons(0xFFF9))) {
593 /* It is not a fragmented frame */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700594 skb->transport_header += sizeof(struct frag_hdr);
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700595 IP6_INC_STATS_BH(net,
Eric Dumazetadf30902009-06-02 05:19:30 +0000596 ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700598 IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 return 1;
600 }
601
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800602 if (atomic_read(&net->ipv6.frags.mem) > net->ipv6.frags.high_thresh)
Eric Dumazetadf30902009-06-02 05:19:30 +0000603 ip6_evictor(net, ip6_dst_idev(skb_dst(skb)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604
Shan Wei95463772010-02-11 00:12:45 +0000605 fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr);
606 if (fq != NULL) {
Herbert Xuf61944e2007-10-15 01:28:47 -0700607 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700609 spin_lock(&fq->q.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
Herbert Xuf61944e2007-10-15 01:28:47 -0700611 ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700613 spin_unlock(&fq->q.lock);
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700614 fq_put(fq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 return ret;
616 }
617
Eric Dumazetadf30902009-06-02 05:19:30 +0000618 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 kfree_skb(skb);
620 return -1;
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700621
622fail_hdr:
Eric Dumazetadf30902009-06-02 05:19:30 +0000623 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS);
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700624 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
625 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626}
627
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000628static const struct inet6_protocol frag_protocol =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629{
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 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800637 .procname = "ip6frag_high_thresh",
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800638 .data = &init_net.ipv6.frags.high_thresh,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800639 .maxlen = sizeof(int),
640 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800641 .proc_handler = proc_dointvec
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800642 },
643 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800644 .procname = "ip6frag_low_thresh",
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800645 .data = &init_net.ipv6.frags.low_thresh,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800646 .maxlen = sizeof(int),
647 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800648 .proc_handler = proc_dointvec
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800649 },
650 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800651 .procname = "ip6frag_time",
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800652 .data = &init_net.ipv6.frags.timeout,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800653 .maxlen = sizeof(int),
654 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800655 .proc_handler = proc_dointvec_jiffies,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800656 },
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700657 { }
658};
659
660static struct ctl_table ip6_frags_ctl_table[] = {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800661 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800662 .procname = "ip6frag_secret_interval",
Pavel Emelyanov3b4bc4a2008-01-22 06:11:04 -0800663 .data = &ip6_frags.secret_interval,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800664 .maxlen = sizeof(int),
665 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800666 .proc_handler = proc_dointvec_jiffies,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800667 },
668 { }
669};
Daniel Lezcano7d460db2008-01-18 23:52:35 -0800670
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000671static int __net_init ip6_frags_ns_sysctl_register(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800672{
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800673 struct ctl_table *table;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800674 struct ctl_table_header *hdr;
675
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700676 table = ip6_frags_ns_ctl_table;
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800677 if (!net_eq(net, &init_net)) {
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700678 table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800679 if (table == NULL)
680 goto err_alloc;
681
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800682 table[0].data = &net->ipv6.frags.high_thresh;
683 table[1].data = &net->ipv6.frags.low_thresh;
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800684 table[2].data = &net->ipv6.frags.timeout;
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800685 }
686
687 hdr = register_net_sysctl_table(net, net_ipv6_ctl_path, table);
688 if (hdr == NULL)
689 goto err_reg;
690
691 net->ipv6.sysctl.frags_hdr = hdr;
692 return 0;
693
694err_reg:
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800695 if (!net_eq(net, &init_net))
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800696 kfree(table);
697err_alloc:
698 return -ENOMEM;
699}
700
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000701static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800702{
703 struct ctl_table *table;
704
705 table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
706 unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
Yang Hongyang3705e112009-12-18 20:25:13 -0800707 if (!net_eq(net, &init_net))
708 kfree(table);
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800709}
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700710
711static struct ctl_table_header *ip6_ctl_header;
712
713static int ip6_frags_sysctl_register(void)
714{
715 ip6_ctl_header = register_net_sysctl_rotable(net_ipv6_ctl_path,
716 ip6_frags_ctl_table);
717 return ip6_ctl_header == NULL ? -ENOMEM : 0;
718}
719
720static void ip6_frags_sysctl_unregister(void)
721{
722 unregister_net_sysctl_table(ip6_ctl_header);
723}
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800724#else
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700725static inline int ip6_frags_ns_sysctl_register(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800726{
727 return 0;
728}
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800729
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700730static inline void ip6_frags_ns_sysctl_unregister(struct net *net)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800731{
732}
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700733
734static inline int ip6_frags_sysctl_register(void)
735{
736 return 0;
737}
738
739static inline void ip6_frags_sysctl_unregister(void)
740{
741}
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800742#endif
743
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000744static int __net_init ipv6_frags_init_net(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800745{
Shan Wei7c070aa2010-01-20 10:42:41 +0100746 net->ipv6.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
747 net->ipv6.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800748 net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800749
Pavel Emelyanove5a2bb8422008-01-22 06:06:23 -0800750 inet_frags_init_net(&net->ipv6.frags);
751
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700752 return ip6_frags_ns_sysctl_register(net);
Daniel Lezcanoe71e0342008-01-10 02:56:03 -0800753}
754
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000755static void __net_exit ipv6_frags_exit_net(struct net *net)
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800756{
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700757 ip6_frags_ns_sysctl_unregister(net);
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800758 inet_frags_exit_net(&net->ipv6.frags, &ip6_frags);
759}
760
761static struct pernet_operations ip6_frags_ops = {
762 .init = ipv6_frags_init_net,
763 .exit = ipv6_frags_exit_net,
764};
765
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800766int __init ipv6_frag_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767{
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800768 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800770 ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
771 if (ret)
772 goto out;
Daniel Lezcanoe71e0342008-01-10 02:56:03 -0800773
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700774 ret = ip6_frags_sysctl_register();
775 if (ret)
776 goto err_sysctl;
777
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700778 ret = register_pernet_subsys(&ip6_frags_ops);
779 if (ret)
780 goto err_pernet;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800781
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700782 ip6_frags.hashfn = ip6_hashfn;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700783 ip6_frags.constructor = ip6_frag_init;
Pavel Emelyanovc9547702007-10-17 19:48:26 -0700784 ip6_frags.destructor = NULL;
Pavel Emelyanov1e4b8282007-10-15 02:39:14 -0700785 ip6_frags.skb_free = NULL;
786 ip6_frags.qsize = sizeof(struct frag_queue);
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700787 ip6_frags.match = ip6_frag_match;
Pavel Emelyanove521db92007-10-17 19:45:23 -0700788 ip6_frags.frag_expire = ip6_frag_expire;
Pavel Emelyanov3b4bc4a2008-01-22 06:11:04 -0800789 ip6_frags.secret_interval = 10 * 60 * HZ;
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700790 inet_frags_init(&ip6_frags);
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800791out:
792 return ret;
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700793
794err_pernet:
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700795 ip6_frags_sysctl_unregister();
796err_sysctl:
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700797 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
798 goto out;
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800799}
800
801void ipv6_frag_exit(void)
802{
803 inet_frags_fini(&ip6_frags);
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700804 ip6_frags_sysctl_unregister();
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800805 unregister_pernet_subsys(&ip6_frags_ops);
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800806 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807}