blob: a555156e9779edd2b3ea89314689d5c2e54de1af [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 */
Patrick McHardy0b5ccb22009-12-15 16:59:18 +010075 u32 user;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 struct in6_addr saddr;
77 struct in6_addr daddr;
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 int iif;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 unsigned int csum;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 __u16 nhoffset;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082};
83
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070084static struct inet_frags ip6_frags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
Pavel Emelyanove5a2bb8422008-01-22 06:06:23 -080086int ip6_frag_nqueues(struct net *net)
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070087{
Pavel Emelyanove5a2bb8422008-01-22 06:06:23 -080088 return net->ipv6.frags.nqueues;
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070089}
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -080091int ip6_frag_mem(struct net *net)
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070092{
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -080093 return atomic_read(&net->ipv6.frags.mem);
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070094}
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Herbert Xuf61944e2007-10-15 01:28:47 -070096static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
97 struct net_device *dev);
98
Zach Brownf6596f92006-04-10 16:05:34 -070099/*
100 * callers should be careful not to use the hash value outside the ipfrag_lock
101 * as doing so could race with ipfrag_hash_rnd being recalculated.
102 */
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700103unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
104 const struct in6_addr *daddr, u32 rnd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
106 u32 a, b, c;
107
Al Viroe69a4ad2006-11-14 20:56:00 -0800108 a = (__force u32)saddr->s6_addr32[0];
109 b = (__force u32)saddr->s6_addr32[1];
110 c = (__force u32)saddr->s6_addr32[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
112 a += JHASH_GOLDEN_RATIO;
113 b += JHASH_GOLDEN_RATIO;
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700114 c += rnd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 __jhash_mix(a, b, c);
116
Al Viroe69a4ad2006-11-14 20:56:00 -0800117 a += (__force u32)saddr->s6_addr32[3];
118 b += (__force u32)daddr->s6_addr32[0];
119 c += (__force u32)daddr->s6_addr32[1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 __jhash_mix(a, b, c);
121
Al Viroe69a4ad2006-11-14 20:56:00 -0800122 a += (__force u32)daddr->s6_addr32[2];
123 b += (__force u32)daddr->s6_addr32[3];
124 c += (__force u32)id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 __jhash_mix(a, b, c);
126
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700127 return c & (INETFRAGS_HASHSZ - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128}
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700129EXPORT_SYMBOL_GPL(inet6_hash_frag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700131static unsigned int ip6_hashfn(struct inet_frag_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700133 struct frag_queue *fq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700135 fq = container_of(q, struct frag_queue, q);
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700136 return inet6_hash_frag(fq->id, &fq->saddr, &fq->daddr, ip6_frags.rnd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137}
138
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700139int ip6_frag_match(struct inet_frag_queue *q, void *a)
140{
141 struct frag_queue *fq;
142 struct ip6_create_arg *arg = a;
143
144 fq = container_of(q, struct frag_queue, q);
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100145 return (fq->id == arg->id && fq->user == arg->user &&
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700146 ipv6_addr_equal(&fq->saddr, arg->src) &&
147 ipv6_addr_equal(&fq->daddr, arg->dst));
148}
149EXPORT_SYMBOL(ip6_frag_match);
150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151/* Memory Tracking Functions. */
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800152static inline void frag_kfree_skb(struct netns_frags *nf,
153 struct sk_buff *skb, int *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154{
155 if (work)
156 *work -= skb->truesize;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800157 atomic_sub(skb->truesize, &nf->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 kfree_skb(skb);
159}
160
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700161void ip6_frag_init(struct inet_frag_queue *q, void *a)
162{
163 struct frag_queue *fq = container_of(q, struct frag_queue, q);
164 struct ip6_create_arg *arg = a;
165
166 fq->id = arg->id;
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100167 fq->user = arg->user;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700168 ipv6_addr_copy(&fq->saddr, arg->src);
169 ipv6_addr_copy(&fq->daddr, arg->dst);
170}
171EXPORT_SYMBOL(ip6_frag_init);
172
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173/* Destruction primitives. */
174
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700175static __inline__ void fq_put(struct frag_queue *fq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176{
Pavel Emelyanov762cc402007-10-15 02:41:56 -0700177 inet_frag_put(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178}
179
180/* Kill fq entry. It is not destroyed immediately,
181 * because caller (and someone more) holds reference count.
182 */
183static __inline__ void fq_kill(struct frag_queue *fq)
184{
Pavel Emelyanov277e6502007-10-15 02:37:18 -0700185 inet_frag_kill(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
187
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800188static void ip6_evictor(struct net *net, struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189{
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700190 int evicted;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800192 evicted = inet_frag_evictor(&net->ipv6.frags, &ip6_frags);
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700193 if (evicted)
Denis V. Lunev821d5772008-10-08 10:32:43 -0700194 IP6_ADD_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS, evicted);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195}
196
197static void ip6_frag_expire(unsigned long data)
198{
Pavel Emelyanove521db92007-10-17 19:45:23 -0700199 struct frag_queue *fq;
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900200 struct net_device *dev = NULL;
Daniel Lezcano4ac2ccd2008-05-02 17:02:03 -0700201 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
Pavel Emelyanove521db92007-10-17 19:45:23 -0700203 fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
204
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700205 spin_lock(&fq->q.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
Joe Perchesbc578a52008-03-28 16:35:27 -0700207 if (fq->q.last_in & INET_FRAG_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 goto out;
209
210 fq_kill(fq);
211
Daniel Lezcano4ac2ccd2008-05-02 17:02:03 -0700212 net = container_of(fq->q.net, struct net, ipv6.frags);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900213 rcu_read_lock();
Eric Dumazet69df9d52009-11-05 20:59:47 -0800214 dev = dev_get_by_index_rcu(net, fq->iif);
215 if (!dev)
216 goto out_rcu_unlock;
217
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700218 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
219 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Ingo Oeser78c784c2006-03-20 23:01:17 -0800221 /* Don't send error if the first segment did not arrive. */
Joe Perchesbc578a52008-03-28 16:35:27 -0700222 if (!(fq->q.last_in & INET_FRAG_FIRST_IN) || !fq->q.fragments)
Eric Dumazet69df9d52009-11-05 20:59:47 -0800223 goto out_rcu_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
Ingo Oeser78c784c2006-03-20 23:01:17 -0800225 /*
226 But use as source device on which LAST ARRIVED
227 segment was received. And do not use fq->dev
228 pointer directly, device might already disappeared.
229 */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700230 fq->q.fragments->dev = dev;
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000231 icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0);
Eric Dumazet69df9d52009-11-05 20:59:47 -0800232out_rcu_unlock:
233 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234out:
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700235 spin_unlock(&fq->q.lock);
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700236 fq_put(fq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237}
238
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700239static __inline__ struct frag_queue *
Shan Wei95463772010-02-11 00:12:45 +0000240fq_find(struct net *net, __be32 id, struct in6_addr *src, struct in6_addr *dst)
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;
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100247 arg.user = IP6_DEFRAG_LOCAL_DELIVER;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700248 arg.src = src;
249 arg.dst = dst;
Pavel Emelyanov9a375802008-06-27 20:06:08 -0700250
251 read_lock(&ip6_frags.lock);
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700252 hash = inet6_hash_frag(id, src, dst, ip6_frags.rnd);
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700253
Pavel Emelyanovac18e752008-01-22 06:02:14 -0800254 q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash);
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700255 if (q == NULL)
Shan Wei95463772010-02-11 00:12:45 +0000256 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700258 return container_of(q, struct frag_queue, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259}
260
Herbert Xuf61944e2007-10-15 01:28:47 -0700261static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 struct frag_hdr *fhdr, int nhoff)
263{
264 struct sk_buff *prev, *next;
Herbert Xuf61944e2007-10-15 01:28:47 -0700265 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 int offset, end;
Eric Dumazetadf30902009-06-02 05:19:30 +0000267 struct net *net = dev_net(skb_dst(skb)->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
Joe Perchesbc578a52008-03-28 16:35:27 -0700269 if (fq->q.last_in & INET_FRAG_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 goto err;
271
272 offset = ntohs(fhdr->frag_off) & ~0x7;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700273 end = offset + (ntohs(ipv6_hdr(skb)->payload_len) -
274 ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
276 if ((unsigned int)end > IPV6_MAXPLEN) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000277 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900278 IPSTATS_MIB_INHDRERRORS);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700279 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
280 ((u8 *)&fhdr->frag_off -
281 skb_network_header(skb)));
Herbert Xuf61944e2007-10-15 01:28:47 -0700282 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 }
284
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700285 if (skb->ip_summed == CHECKSUM_COMPLETE) {
286 const unsigned char *nh = skb_network_header(skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900287 skb->csum = csum_sub(skb->csum,
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700288 csum_partial(nh, (u8 *)(fhdr + 1) - nh,
289 0));
290 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
292 /* Is this the final fragment? */
293 if (!(fhdr->frag_off & htons(IP6_MF))) {
294 /* If we already have some bits beyond end
295 * or have different end, the segment is corrupted.
296 */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700297 if (end < fq->q.len ||
Joe Perchesbc578a52008-03-28 16:35:27 -0700298 ((fq->q.last_in & INET_FRAG_LAST_IN) && end != fq->q.len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 goto err;
Joe Perchesbc578a52008-03-28 16:35:27 -0700300 fq->q.last_in |= INET_FRAG_LAST_IN;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700301 fq->q.len = end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 } else {
303 /* Check if the fragment is rounded to 8 bytes.
304 * Required by the RFC.
305 */
306 if (end & 0x7) {
307 /* RFC2460 says always send parameter problem in
308 * this case. -DaveM
309 */
Eric Dumazetadf30902009-06-02 05:19:30 +0000310 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900311 IPSTATS_MIB_INHDRERRORS);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900312 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 offsetof(struct ipv6hdr, payload_len));
Herbert Xuf61944e2007-10-15 01:28:47 -0700314 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 }
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700316 if (end > fq->q.len) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 /* Some bits beyond end -> corruption. */
Joe Perchesbc578a52008-03-28 16:35:27 -0700318 if (fq->q.last_in & INET_FRAG_LAST_IN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 goto err;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700320 fq->q.len = end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 }
322 }
323
324 if (end == offset)
325 goto err;
326
327 /* Point into the IP datagram 'data' part. */
328 if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data))
329 goto err;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900330
Stephen Hemminger42ca89c2005-09-08 12:57:43 -0700331 if (pskb_trim_rcsum(skb, end - offset))
332 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
334 /* Find out which fragments are in front and at the back of us
335 * in the chain of fragments so far. We must know where to put
336 * this fragment, right?
337 */
338 prev = NULL;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700339 for(next = fq->q.fragments; next != NULL; next = next->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 if (FRAG6_CB(next)->offset >= offset)
341 break; /* bingo! */
342 prev = next;
343 }
344
345 /* We found where to put this one. Check for overlap with
346 * preceding fragment, and, if needed, align things so that
347 * any overlaps are eliminated.
348 */
349 if (prev) {
350 int i = (FRAG6_CB(prev)->offset + prev->len) - offset;
351
352 if (i > 0) {
353 offset += i;
354 if (end <= offset)
355 goto err;
356 if (!pskb_pull(skb, i))
357 goto err;
358 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
359 skb->ip_summed = CHECKSUM_NONE;
360 }
361 }
362
363 /* Look for overlap with succeeding segments.
364 * If we can merge fragments, do it.
365 */
366 while (next && FRAG6_CB(next)->offset < end) {
367 int i = end - FRAG6_CB(next)->offset; /* overlap is 'i' bytes */
368
369 if (i < next->len) {
370 /* Eat head of the next overlapped fragment
371 * and leave the loop. The next ones cannot overlap.
372 */
373 if (!pskb_pull(next, i))
374 goto err;
375 FRAG6_CB(next)->offset += i; /* next fragment */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700376 fq->q.meat -= i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 if (next->ip_summed != CHECKSUM_UNNECESSARY)
378 next->ip_summed = CHECKSUM_NONE;
379 break;
380 } else {
381 struct sk_buff *free_it = next;
382
383 /* Old fragment is completely overridden with
384 * new one drop it.
385 */
386 next = next->next;
387
388 if (prev)
389 prev->next = next;
390 else
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700391 fq->q.fragments = next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700393 fq->q.meat -= free_it->len;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800394 frag_kfree_skb(fq->q.net, free_it, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 }
396 }
397
398 FRAG6_CB(skb)->offset = offset;
399
400 /* Insert this fragment in the chain of fragments. */
401 skb->next = next;
402 if (prev)
403 prev->next = skb;
404 else
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700405 fq->q.fragments = skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
Herbert Xuf61944e2007-10-15 01:28:47 -0700407 dev = skb->dev;
408 if (dev) {
409 fq->iif = dev->ifindex;
410 skb->dev = NULL;
411 }
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700412 fq->q.stamp = skb->tstamp;
413 fq->q.meat += skb->len;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800414 atomic_add(skb->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
416 /* The first fragment.
417 * nhoffset is obtained from the first fragment, of course.
418 */
419 if (offset == 0) {
420 fq->nhoffset = nhoff;
Joe Perchesbc578a52008-03-28 16:35:27 -0700421 fq->q.last_in |= INET_FRAG_FIRST_IN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 }
Herbert Xuf61944e2007-10-15 01:28:47 -0700423
Joe Perchesbc578a52008-03-28 16:35:27 -0700424 if (fq->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
425 fq->q.meat == fq->q.len)
Herbert Xuf61944e2007-10-15 01:28:47 -0700426 return ip6_frag_reasm(fq, prev, dev);
427
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700428 write_lock(&ip6_frags.lock);
Pavel Emelyanov3140c252008-01-22 06:11:48 -0800429 list_move_tail(&fq->q.lru_list, &fq->q.net->lru_list);
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700430 write_unlock(&ip6_frags.lock);
Herbert Xuf61944e2007-10-15 01:28:47 -0700431 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
433err:
Eric Dumazetadf30902009-06-02 05:19:30 +0000434 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
Denis V. Lunev3bd653c2008-10-08 10:54:51 -0700435 IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 kfree_skb(skb);
Herbert Xuf61944e2007-10-15 01:28:47 -0700437 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438}
439
440/*
441 * Check if this packet is complete.
442 * Returns NULL on failure by any reason, and pointer
443 * to current nexthdr field in reassembled frame.
444 *
445 * It is called with locked fq, and caller must check that
446 * queue is eligible for reassembly i.e. it is not COMPLETE,
447 * the last and the first frames arrived and all the bits are here.
448 */
Herbert Xuf61944e2007-10-15 01:28:47 -0700449static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 struct net_device *dev)
451{
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700452 struct net *net = container_of(fq->q.net, struct net, ipv6.frags);
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700453 struct sk_buff *fp, *head = fq->q.fragments;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 int payload_len;
455 unsigned int nhoff;
456
457 fq_kill(fq);
458
Herbert Xuf61944e2007-10-15 01:28:47 -0700459 /* Make the one we just received the head. */
460 if (prev) {
461 head = prev->next;
462 fp = skb_clone(head, GFP_ATOMIC);
463
464 if (!fp)
465 goto out_oom;
466
467 fp->next = head->next;
468 prev->next = fp;
469
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700470 skb_morph(head, fq->q.fragments);
471 head->next = fq->q.fragments->next;
Herbert Xuf61944e2007-10-15 01:28:47 -0700472
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700473 kfree_skb(fq->q.fragments);
474 fq->q.fragments = head;
Herbert Xuf61944e2007-10-15 01:28:47 -0700475 }
476
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700477 WARN_ON(head == NULL);
478 WARN_ON(FRAG6_CB(head)->offset != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
480 /* Unfragmented part is taken from the first segment. */
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700481 payload_len = ((head->data - skb_network_header(head)) -
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700482 sizeof(struct ipv6hdr) + fq->q.len -
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700483 sizeof(struct frag_hdr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 if (payload_len > IPV6_MAXPLEN)
485 goto out_oversize;
486
487 /* Head of list must not be cloned. */
488 if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC))
489 goto out_oom;
490
491 /* If the first fragment is fragmented itself, we split
492 * it to two chunks: the first with data and paged part
493 * and the second, holding only fragments. */
David S. Miller4d9092b2009-06-09 00:20:05 -0700494 if (skb_has_frags(head)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 struct sk_buff *clone;
496 int i, plen = 0;
497
498 if ((clone = alloc_skb(0, GFP_ATOMIC)) == NULL)
499 goto out_oom;
500 clone->next = head->next;
501 head->next = clone;
502 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
David S. Miller4d9092b2009-06-09 00:20:05 -0700503 skb_frag_list_init(head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 for (i=0; i<skb_shinfo(head)->nr_frags; i++)
505 plen += skb_shinfo(head)->frags[i].size;
506 clone->len = clone->data_len = head->data_len - plen;
507 head->data_len -= clone->len;
508 head->len -= clone->len;
509 clone->csum = 0;
510 clone->ip_summed = head->ip_summed;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800511 atomic_add(clone->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 }
513
514 /* We have to remove fragment header from datagram and to relocate
515 * header in order to calculate ICV correctly. */
516 nhoff = fq->nhoffset;
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700517 skb_network_header(head)[nhoff] = skb_transport_header(head)[0];
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900518 memmove(head->head + sizeof(struct frag_hdr), head->head,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 (head->data - head->head) - sizeof(struct frag_hdr));
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700520 head->mac_header += sizeof(struct frag_hdr);
521 head->network_header += sizeof(struct frag_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
523 skb_shinfo(head)->frag_list = head->next;
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300524 skb_reset_transport_header(head);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700525 skb_push(head, head->data - skb_network_header(head));
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800526 atomic_sub(head->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
528 for (fp=head->next; fp; fp = fp->next) {
529 head->data_len += fp->len;
530 head->len += fp->len;
531 if (head->ip_summed != fp->ip_summed)
532 head->ip_summed = CHECKSUM_NONE;
Patrick McHardy84fa7932006-08-29 16:44:56 -0700533 else if (head->ip_summed == CHECKSUM_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 head->csum = csum_add(head->csum, fp->csum);
535 head->truesize += fp->truesize;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800536 atomic_sub(fp->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 }
538
539 head->next = NULL;
540 head->dev = dev;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700541 head->tstamp = fq->q.stamp;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700542 ipv6_hdr(head)->payload_len = htons(payload_len);
Patrick McHardy951dbc82006-01-06 23:02:34 -0800543 IP6CB(head)->nhoff = nhoff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 /* Yes, and fold redundant checksum back. 8) */
Patrick McHardy84fa7932006-08-29 16:44:56 -0700546 if (head->ip_summed == CHECKSUM_COMPLETE)
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700547 head->csum = csum_partial(skb_network_header(head),
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300548 skb_network_header_len(head),
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700549 head->csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900551 rcu_read_lock();
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700552 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900553 rcu_read_unlock();
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700554 fq->q.fragments = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 return 1;
556
557out_oversize:
558 if (net_ratelimit())
559 printk(KERN_DEBUG "ip6_frag_reasm: payload len = %d\n", payload_len);
560 goto out_fail;
561out_oom:
562 if (net_ratelimit())
563 printk(KERN_DEBUG "ip6_frag_reasm: no memory for reassembly\n");
564out_fail:
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900565 rcu_read_lock();
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700566 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900567 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 return -1;
569}
570
Herbert Xue5bbef22007-10-15 12:50:28 -0700571static int ipv6_frag_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 struct frag_hdr *fhdr;
574 struct frag_queue *fq;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700575 struct ipv6hdr *hdr = ipv6_hdr(skb);
Eric Dumazetadf30902009-06-02 05:19:30 +0000576 struct net *net = dev_net(skb_dst(skb)->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
Eric Dumazetadf30902009-06-02 05:19:30 +0000578 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
580 /* Jumbo payload inhibits frag. header */
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700581 if (hdr->payload_len==0)
582 goto fail_hdr;
583
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700584 if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700585 sizeof(struct frag_hdr))))
586 goto fail_hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700588 hdr = ipv6_hdr(skb);
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700589 fhdr = (struct frag_hdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590
591 if (!(fhdr->frag_off & htons(0xFFF9))) {
592 /* It is not a fragmented frame */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700593 skb->transport_header += sizeof(struct frag_hdr);
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700594 IP6_INC_STATS_BH(net,
Eric Dumazetadf30902009-06-02 05:19:30 +0000595 ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700597 IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 return 1;
599 }
600
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800601 if (atomic_read(&net->ipv6.frags.mem) > net->ipv6.frags.high_thresh)
Eric Dumazetadf30902009-06-02 05:19:30 +0000602 ip6_evictor(net, ip6_dst_idev(skb_dst(skb)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
Shan Wei95463772010-02-11 00:12:45 +0000604 fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr);
605 if (fq != NULL) {
Herbert Xuf61944e2007-10-15 01:28:47 -0700606 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700608 spin_lock(&fq->q.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
Herbert Xuf61944e2007-10-15 01:28:47 -0700610 ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700612 spin_unlock(&fq->q.lock);
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700613 fq_put(fq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 return ret;
615 }
616
Eric Dumazetadf30902009-06-02 05:19:30 +0000617 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 kfree_skb(skb);
619 return -1;
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700620
621fail_hdr:
Eric Dumazetadf30902009-06-02 05:19:30 +0000622 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS);
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700623 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
624 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625}
626
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000627static const struct inet6_protocol frag_protocol =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628{
629 .handler = ipv6_frag_rcv,
630 .flags = INET6_PROTO_NOPOLICY,
631};
632
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800633#ifdef CONFIG_SYSCTL
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700634static struct ctl_table ip6_frags_ns_ctl_table[] = {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800635 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800636 .procname = "ip6frag_high_thresh",
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800637 .data = &init_net.ipv6.frags.high_thresh,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800638 .maxlen = sizeof(int),
639 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800640 .proc_handler = proc_dointvec
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800641 },
642 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800643 .procname = "ip6frag_low_thresh",
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800644 .data = &init_net.ipv6.frags.low_thresh,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800645 .maxlen = sizeof(int),
646 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800647 .proc_handler = proc_dointvec
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800648 },
649 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800650 .procname = "ip6frag_time",
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800651 .data = &init_net.ipv6.frags.timeout,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800652 .maxlen = sizeof(int),
653 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800654 .proc_handler = proc_dointvec_jiffies,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800655 },
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700656 { }
657};
658
659static struct ctl_table ip6_frags_ctl_table[] = {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800660 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800661 .procname = "ip6frag_secret_interval",
Pavel Emelyanov3b4bc4a2008-01-22 06:11:04 -0800662 .data = &ip6_frags.secret_interval,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800663 .maxlen = sizeof(int),
664 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800665 .proc_handler = proc_dointvec_jiffies,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800666 },
667 { }
668};
Daniel Lezcano7d460db2008-01-18 23:52:35 -0800669
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000670static int __net_init ip6_frags_ns_sysctl_register(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800671{
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800672 struct ctl_table *table;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800673 struct ctl_table_header *hdr;
674
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700675 table = ip6_frags_ns_ctl_table;
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800676 if (!net_eq(net, &init_net)) {
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700677 table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800678 if (table == NULL)
679 goto err_alloc;
680
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800681 table[0].data = &net->ipv6.frags.high_thresh;
682 table[1].data = &net->ipv6.frags.low_thresh;
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800683 table[2].data = &net->ipv6.frags.timeout;
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800684 }
685
686 hdr = register_net_sysctl_table(net, net_ipv6_ctl_path, table);
687 if (hdr == NULL)
688 goto err_reg;
689
690 net->ipv6.sysctl.frags_hdr = hdr;
691 return 0;
692
693err_reg:
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800694 if (!net_eq(net, &init_net))
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800695 kfree(table);
696err_alloc:
697 return -ENOMEM;
698}
699
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000700static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800701{
702 struct ctl_table *table;
703
704 table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
705 unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
Yang Hongyang3705e112009-12-18 20:25:13 -0800706 if (!net_eq(net, &init_net))
707 kfree(table);
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800708}
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700709
710static struct ctl_table_header *ip6_ctl_header;
711
712static int ip6_frags_sysctl_register(void)
713{
714 ip6_ctl_header = register_net_sysctl_rotable(net_ipv6_ctl_path,
715 ip6_frags_ctl_table);
716 return ip6_ctl_header == NULL ? -ENOMEM : 0;
717}
718
719static void ip6_frags_sysctl_unregister(void)
720{
721 unregister_net_sysctl_table(ip6_ctl_header);
722}
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800723#else
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700724static inline int ip6_frags_ns_sysctl_register(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800725{
726 return 0;
727}
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800728
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700729static inline void ip6_frags_ns_sysctl_unregister(struct net *net)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800730{
731}
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700732
733static inline int ip6_frags_sysctl_register(void)
734{
735 return 0;
736}
737
738static inline void ip6_frags_sysctl_unregister(void)
739{
740}
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800741#endif
742
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000743static int __net_init ipv6_frags_init_net(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800744{
Shan Wei7c070aa2010-01-20 10:42:41 +0100745 net->ipv6.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
746 net->ipv6.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800747 net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800748
Pavel Emelyanove5a2bb8422008-01-22 06:06:23 -0800749 inet_frags_init_net(&net->ipv6.frags);
750
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700751 return ip6_frags_ns_sysctl_register(net);
Daniel Lezcanoe71e0342008-01-10 02:56:03 -0800752}
753
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000754static void __net_exit ipv6_frags_exit_net(struct net *net)
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800755{
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700756 ip6_frags_ns_sysctl_unregister(net);
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800757 inet_frags_exit_net(&net->ipv6.frags, &ip6_frags);
758}
759
760static struct pernet_operations ip6_frags_ops = {
761 .init = ipv6_frags_init_net,
762 .exit = ipv6_frags_exit_net,
763};
764
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800765int __init ipv6_frag_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766{
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800767 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800769 ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
770 if (ret)
771 goto out;
Daniel Lezcanoe71e0342008-01-10 02:56:03 -0800772
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700773 ret = ip6_frags_sysctl_register();
774 if (ret)
775 goto err_sysctl;
776
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700777 ret = register_pernet_subsys(&ip6_frags_ops);
778 if (ret)
779 goto err_pernet;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800780
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700781 ip6_frags.hashfn = ip6_hashfn;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700782 ip6_frags.constructor = ip6_frag_init;
Pavel Emelyanovc9547702007-10-17 19:48:26 -0700783 ip6_frags.destructor = NULL;
Pavel Emelyanov1e4b8282007-10-15 02:39:14 -0700784 ip6_frags.skb_free = NULL;
785 ip6_frags.qsize = sizeof(struct frag_queue);
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700786 ip6_frags.match = ip6_frag_match;
Pavel Emelyanove521db92007-10-17 19:45:23 -0700787 ip6_frags.frag_expire = ip6_frag_expire;
Pavel Emelyanov3b4bc4a2008-01-22 06:11:04 -0800788 ip6_frags.secret_interval = 10 * 60 * HZ;
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700789 inet_frags_init(&ip6_frags);
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800790out:
791 return ret;
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700792
793err_pernet:
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700794 ip6_frags_sysctl_unregister();
795err_sysctl:
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700796 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
797 goto out;
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800798}
799
800void ipv6_frag_exit(void)
801{
802 inet_frags_fini(&ip6_frags);
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700803 ip6_frags_sysctl_unregister();
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800804 unregister_pernet_subsys(&ip6_frags_ops);
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800805 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806}