blob: 4ff9af628e72762843cf35c083c6ee1427b57b03 [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>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040045#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47#include <net/sock.h>
48#include <net/snmp.h>
49
50#include <net/ipv6.h>
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +090051#include <net/ip6_route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <net/protocol.h>
53#include <net/transp_v6.h>
54#include <net/rawv6.h>
55#include <net/ndisc.h>
56#include <net/addrconf.h>
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -070057#include <net/inet_frag.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Linus Torvalds1da177e2005-04-16 15:20:36 -070059struct ip6frag_skb_cb
60{
61 struct inet6_skb_parm h;
62 int offset;
63};
64
65#define FRAG6_CB(skb) ((struct ip6frag_skb_cb*)((skb)->cb))
66
67
68/*
69 * Equivalent of ipv4 struct ipq
70 */
71
72struct frag_queue
73{
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -070074 struct inet_frag_queue q;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Al Viroe69a4adc2006-11-14 20:56:00 -080076 __be32 id; /* fragment id */
Patrick McHardy0b5ccb22009-12-15 16:59:18 +010077 u32 user;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 struct in6_addr saddr;
79 struct in6_addr daddr;
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 int iif;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 unsigned int csum;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 __u16 nhoffset;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084};
85
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070086static struct inet_frags ip6_frags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
Pavel Emelyanove5a2bb82008-01-22 06:06:23 -080088int ip6_frag_nqueues(struct net *net)
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070089{
Pavel Emelyanove5a2bb82008-01-22 06:06:23 -080090 return net->ipv6.frags.nqueues;
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070091}
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -080093int ip6_frag_mem(struct net *net)
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070094{
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -080095 return atomic_read(&net->ipv6.frags.mem);
Pavel Emelyanov7eb95152007-10-15 02:31:52 -070096}
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Herbert Xuf61944e2007-10-15 01:28:47 -070098static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
99 struct net_device *dev);
100
Zach Brownf6596f92006-04-10 16:05:34 -0700101/*
102 * callers should be careful not to use the hash value outside the ipfrag_lock
103 * as doing so could race with ipfrag_hash_rnd being recalculated.
104 */
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700105unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
106 const struct in6_addr *daddr, u32 rnd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107{
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +0000108 u32 c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +0000110 c = jhash_3words((__force u32)saddr->s6_addr32[0],
111 (__force u32)saddr->s6_addr32[1],
112 (__force u32)saddr->s6_addr32[2],
113 rnd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +0000115 c = jhash_3words((__force u32)saddr->s6_addr32[3],
116 (__force u32)daddr->s6_addr32[0],
117 (__force u32)daddr->s6_addr32[1],
118 c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Jozsef Kadlecsik82a39eb2010-11-25 03:15:07 +0000120 c = jhash_3words((__force u32)daddr->s6_addr32[2],
121 (__force u32)daddr->s6_addr32[3],
122 (__force u32)id,
123 c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700125 return c & (INETFRAGS_HASHSZ - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126}
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700127EXPORT_SYMBOL_GPL(inet6_hash_frag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700129static unsigned int ip6_hashfn(struct inet_frag_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700131 struct frag_queue *fq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700133 fq = container_of(q, struct frag_queue, q);
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700134 return inet6_hash_frag(fq->id, &fq->saddr, &fq->daddr, ip6_frags.rnd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135}
136
Eric Dumazetcbc264c2012-05-18 05:57:13 +0200137bool ip6_frag_match(struct inet_frag_queue *q, void *a)
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700138{
139 struct frag_queue *fq;
140 struct ip6_create_arg *arg = a;
141
142 fq = container_of(q, struct frag_queue, q);
Eric Dumazetcbc264c2012-05-18 05:57:13 +0200143 return fq->id == arg->id &&
144 fq->user == arg->user &&
145 ipv6_addr_equal(&fq->saddr, arg->src) &&
146 ipv6_addr_equal(&fq->daddr, arg->dst);
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700147}
148EXPORT_SYMBOL(ip6_frag_match);
149
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700150void ip6_frag_init(struct inet_frag_queue *q, void *a)
151{
152 struct frag_queue *fq = container_of(q, struct frag_queue, q);
153 struct ip6_create_arg *arg = a;
154
155 fq->id = arg->id;
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100156 fq->user = arg->user;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000157 fq->saddr = *arg->src;
158 fq->daddr = *arg->dst;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700159}
160EXPORT_SYMBOL(ip6_frag_init);
161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162/* Destruction primitives. */
163
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700164static __inline__ void fq_put(struct frag_queue *fq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165{
Pavel Emelyanov762cc402007-10-15 02:41:56 -0700166 inet_frag_put(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167}
168
169/* Kill fq entry. It is not destroyed immediately,
170 * because caller (and someone more) holds reference count.
171 */
172static __inline__ void fq_kill(struct frag_queue *fq)
173{
Pavel Emelyanov277e6502007-10-15 02:37:18 -0700174 inet_frag_kill(&fq->q, &ip6_frags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175}
176
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800177static void ip6_evictor(struct net *net, struct inet6_dev *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178{
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700179 int evicted;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800181 evicted = inet_frag_evictor(&net->ipv6.frags, &ip6_frags);
Pavel Emelyanov8e7999c2007-10-15 02:40:06 -0700182 if (evicted)
Denis V. Lunev821d5772008-10-08 10:32:43 -0700183 IP6_ADD_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS, evicted);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184}
185
186static void ip6_frag_expire(unsigned long data)
187{
Pavel Emelyanove521db92007-10-17 19:45:23 -0700188 struct frag_queue *fq;
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900189 struct net_device *dev = NULL;
Daniel Lezcano4ac2ccd2008-05-02 17:02:03 -0700190 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Pavel Emelyanove521db92007-10-17 19:45:23 -0700192 fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
193
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700194 spin_lock(&fq->q.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Joe Perchesbc578a52008-03-28 16:35:27 -0700196 if (fq->q.last_in & INET_FRAG_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 goto out;
198
199 fq_kill(fq);
200
Daniel Lezcano4ac2ccd2008-05-02 17:02:03 -0700201 net = container_of(fq->q.net, struct net, ipv6.frags);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900202 rcu_read_lock();
Eric Dumazet69df9d52009-11-05 20:59:47 -0800203 dev = dev_get_by_index_rcu(net, fq->iif);
204 if (!dev)
205 goto out_rcu_unlock;
206
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700207 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
208 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
Ingo Oeser78c784c2006-03-20 23:01:17 -0800210 /* Don't send error if the first segment did not arrive. */
Joe Perchesbc578a52008-03-28 16:35:27 -0700211 if (!(fq->q.last_in & INET_FRAG_FIRST_IN) || !fq->q.fragments)
Eric Dumazet69df9d52009-11-05 20:59:47 -0800212 goto out_rcu_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
Ingo Oeser78c784c2006-03-20 23:01:17 -0800214 /*
215 But use as source device on which LAST ARRIVED
216 segment was received. And do not use fq->dev
217 pointer directly, device might already disappeared.
218 */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700219 fq->q.fragments->dev = dev;
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000220 icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0);
Eric Dumazet69df9d52009-11-05 20:59:47 -0800221out_rcu_unlock:
222 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223out:
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700224 spin_unlock(&fq->q.lock);
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700225 fq_put(fq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226}
227
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700228static __inline__ struct frag_queue *
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000229fq_find(struct net *net, __be32 id, const struct in6_addr *src, const struct in6_addr *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230{
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700231 struct inet_frag_queue *q;
232 struct ip6_create_arg arg;
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700233 unsigned int hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700235 arg.id = id;
Patrick McHardy0b5ccb22009-12-15 16:59:18 +0100236 arg.user = IP6_DEFRAG_LOCAL_DELIVER;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700237 arg.src = src;
238 arg.dst = dst;
Pavel Emelyanov9a375802008-06-27 20:06:08 -0700239
240 read_lock(&ip6_frags.lock);
Ilpo Järvinen93c8b902008-10-01 02:48:31 -0700241 hash = inet6_hash_frag(id, src, dst, ip6_frags.rnd);
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700242
Pavel Emelyanovac18e752008-01-22 06:02:14 -0800243 q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash);
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700244 if (q == NULL)
Shan Wei95463772010-02-11 00:12:45 +0000245 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700247 return container_of(q, struct frag_queue, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248}
249
Herbert Xuf61944e2007-10-15 01:28:47 -0700250static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 struct frag_hdr *fhdr, int nhoff)
252{
253 struct sk_buff *prev, *next;
Herbert Xuf61944e2007-10-15 01:28:47 -0700254 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 int offset, end;
Eric Dumazetadf30902009-06-02 05:19:30 +0000256 struct net *net = dev_net(skb_dst(skb)->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
Joe Perchesbc578a52008-03-28 16:35:27 -0700258 if (fq->q.last_in & INET_FRAG_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 goto err;
260
261 offset = ntohs(fhdr->frag_off) & ~0x7;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700262 end = offset + (ntohs(ipv6_hdr(skb)->payload_len) -
263 ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
265 if ((unsigned int)end > IPV6_MAXPLEN) {
Eric Dumazetadf30902009-06-02 05:19:30 +0000266 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900267 IPSTATS_MIB_INHDRERRORS);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700268 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
269 ((u8 *)&fhdr->frag_off -
270 skb_network_header(skb)));
Herbert Xuf61944e2007-10-15 01:28:47 -0700271 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
273
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700274 if (skb->ip_summed == CHECKSUM_COMPLETE) {
275 const unsigned char *nh = skb_network_header(skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900276 skb->csum = csum_sub(skb->csum,
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700277 csum_partial(nh, (u8 *)(fhdr + 1) - nh,
278 0));
279 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
281 /* Is this the final fragment? */
282 if (!(fhdr->frag_off & htons(IP6_MF))) {
283 /* If we already have some bits beyond end
284 * or have different end, the segment is corrupted.
285 */
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700286 if (end < fq->q.len ||
Joe Perchesbc578a52008-03-28 16:35:27 -0700287 ((fq->q.last_in & INET_FRAG_LAST_IN) && end != fq->q.len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 goto err;
Joe Perchesbc578a52008-03-28 16:35:27 -0700289 fq->q.last_in |= INET_FRAG_LAST_IN;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700290 fq->q.len = end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 } else {
292 /* Check if the fragment is rounded to 8 bytes.
293 * Required by the RFC.
294 */
295 if (end & 0x7) {
296 /* RFC2460 says always send parameter problem in
297 * this case. -DaveM
298 */
Eric Dumazetadf30902009-06-02 05:19:30 +0000299 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900300 IPSTATS_MIB_INHDRERRORS);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900301 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 offsetof(struct ipv6hdr, payload_len));
Herbert Xuf61944e2007-10-15 01:28:47 -0700303 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 }
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700305 if (end > fq->q.len) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 /* Some bits beyond end -> corruption. */
Joe Perchesbc578a52008-03-28 16:35:27 -0700307 if (fq->q.last_in & INET_FRAG_LAST_IN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 goto err;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700309 fq->q.len = end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 }
311 }
312
313 if (end == offset)
314 goto err;
315
316 /* Point into the IP datagram 'data' part. */
317 if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data))
318 goto err;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900319
Stephen Hemminger42ca89c2005-09-08 12:57:43 -0700320 if (pskb_trim_rcsum(skb, end - offset))
321 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
323 /* Find out which fragments are in front and at the back of us
324 * in the chain of fragments so far. We must know where to put
325 * this fragment, right?
326 */
Changli Gaod6bebca2010-06-29 04:39:37 +0000327 prev = fq->q.fragments_tail;
328 if (!prev || FRAG6_CB(prev)->offset < offset) {
329 next = NULL;
330 goto found;
331 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 prev = NULL;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700333 for(next = fq->q.fragments; next != NULL; next = next->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 if (FRAG6_CB(next)->offset >= offset)
335 break; /* bingo! */
336 prev = next;
337 }
338
Changli Gaod6bebca2010-06-29 04:39:37 +0000339found:
Eric Dumazet5de658f2012-01-30 04:29:24 +0000340 /* RFC5722, Section 4, amended by Errata ID : 3089
341 * When reassembling an IPv6 datagram, if
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000342 * one or more its constituent fragments is determined to be an
343 * overlapping fragment, the entire datagram (and any constituent
Eric Dumazet5de658f2012-01-30 04:29:24 +0000344 * fragments) MUST be silently discarded.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000347 /* Check for overlap with preceding fragment. */
348 if (prev &&
Shan Weif4642142010-11-05 01:56:34 +0000349 (FRAG6_CB(prev)->offset + prev->len) > offset)
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000350 goto discard_fq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000352 /* Look for overlap with succeeding segment. */
353 if (next && FRAG6_CB(next)->offset < end)
354 goto discard_fq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
356 FRAG6_CB(skb)->offset = offset;
357
358 /* Insert this fragment in the chain of fragments. */
359 skb->next = next;
Changli Gaod6bebca2010-06-29 04:39:37 +0000360 if (!next)
361 fq->q.fragments_tail = skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 if (prev)
363 prev->next = skb;
364 else
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700365 fq->q.fragments = skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
Herbert Xuf61944e2007-10-15 01:28:47 -0700367 dev = skb->dev;
368 if (dev) {
369 fq->iif = dev->ifindex;
370 skb->dev = NULL;
371 }
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700372 fq->q.stamp = skb->tstamp;
373 fq->q.meat += skb->len;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800374 atomic_add(skb->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
376 /* The first fragment.
377 * nhoffset is obtained from the first fragment, of course.
378 */
379 if (offset == 0) {
380 fq->nhoffset = nhoff;
Joe Perchesbc578a52008-03-28 16:35:27 -0700381 fq->q.last_in |= INET_FRAG_FIRST_IN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 }
Herbert Xuf61944e2007-10-15 01:28:47 -0700383
Joe Perchesbc578a52008-03-28 16:35:27 -0700384 if (fq->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
385 fq->q.meat == fq->q.len)
Herbert Xuf61944e2007-10-15 01:28:47 -0700386 return ip6_frag_reasm(fq, prev, dev);
387
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700388 write_lock(&ip6_frags.lock);
Pavel Emelyanov3140c252008-01-22 06:11:48 -0800389 list_move_tail(&fq->q.lru_list, &fq->q.net->lru_list);
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700390 write_unlock(&ip6_frags.lock);
Herbert Xuf61944e2007-10-15 01:28:47 -0700391 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
Nicolas Dichtel70789d72010-09-03 05:13:05 +0000393discard_fq:
394 fq_kill(fq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395err:
Eric Dumazetadf30902009-06-02 05:19:30 +0000396 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
Denis V. Lunev3bd653c2008-10-08 10:54:51 -0700397 IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 kfree_skb(skb);
Herbert Xuf61944e2007-10-15 01:28:47 -0700399 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400}
401
402/*
403 * Check if this packet is complete.
404 * Returns NULL on failure by any reason, and pointer
405 * to current nexthdr field in reassembled frame.
406 *
407 * It is called with locked fq, and caller must check that
408 * queue is eligible for reassembly i.e. it is not COMPLETE,
409 * the last and the first frames arrived and all the bits are here.
410 */
Herbert Xuf61944e2007-10-15 01:28:47 -0700411static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 struct net_device *dev)
413{
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700414 struct net *net = container_of(fq->q.net, struct net, ipv6.frags);
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700415 struct sk_buff *fp, *head = fq->q.fragments;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 int payload_len;
417 unsigned int nhoff;
Eric Dumazetec164392012-05-19 03:02:35 +0000418 int sum_truesize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
420 fq_kill(fq);
421
Herbert Xuf61944e2007-10-15 01:28:47 -0700422 /* Make the one we just received the head. */
423 if (prev) {
424 head = prev->next;
425 fp = skb_clone(head, GFP_ATOMIC);
426
427 if (!fp)
428 goto out_oom;
429
430 fp->next = head->next;
Changli Gaod6bebca2010-06-29 04:39:37 +0000431 if (!fp->next)
432 fq->q.fragments_tail = fp;
Herbert Xuf61944e2007-10-15 01:28:47 -0700433 prev->next = fp;
434
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700435 skb_morph(head, fq->q.fragments);
436 head->next = fq->q.fragments->next;
Herbert Xuf61944e2007-10-15 01:28:47 -0700437
Eric Dumazet808db802012-04-24 10:17:59 +0000438 consume_skb(fq->q.fragments);
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700439 fq->q.fragments = head;
Herbert Xuf61944e2007-10-15 01:28:47 -0700440 }
441
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700442 WARN_ON(head == NULL);
443 WARN_ON(FRAG6_CB(head)->offset != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
445 /* Unfragmented part is taken from the first segment. */
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700446 payload_len = ((head->data - skb_network_header(head)) -
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700447 sizeof(struct ipv6hdr) + fq->q.len -
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700448 sizeof(struct frag_hdr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 if (payload_len > IPV6_MAXPLEN)
450 goto out_oversize;
451
452 /* Head of list must not be cloned. */
453 if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC))
454 goto out_oom;
455
456 /* If the first fragment is fragmented itself, we split
457 * it to two chunks: the first with data and paged part
458 * and the second, holding only fragments. */
David S. Miller21dc3302010-08-23 00:13:46 -0700459 if (skb_has_frag_list(head)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 struct sk_buff *clone;
461 int i, plen = 0;
462
463 if ((clone = alloc_skb(0, GFP_ATOMIC)) == NULL)
464 goto out_oom;
465 clone->next = head->next;
466 head->next = clone;
467 skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
David S. Miller4d9092b2009-06-09 00:20:05 -0700468 skb_frag_list_init(head);
Eric Dumazet9e903e02011-10-18 21:00:24 +0000469 for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
470 plen += skb_frag_size(&skb_shinfo(head)->frags[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 clone->len = clone->data_len = head->data_len - plen;
472 head->data_len -= clone->len;
473 head->len -= clone->len;
474 clone->csum = 0;
475 clone->ip_summed = head->ip_summed;
Pavel Emelyanov6ddc0822008-01-22 06:07:25 -0800476 atomic_add(clone->truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 }
478
479 /* We have to remove fragment header from datagram and to relocate
480 * header in order to calculate ICV correctly. */
481 nhoff = fq->nhoffset;
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700482 skb_network_header(head)[nhoff] = skb_transport_header(head)[0];
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900483 memmove(head->head + sizeof(struct frag_hdr), head->head,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 (head->data - head->head) - sizeof(struct frag_hdr));
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700485 head->mac_header += sizeof(struct frag_hdr);
486 head->network_header += sizeof(struct frag_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300488 skb_reset_transport_header(head);
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700489 skb_push(head, head->data - skb_network_header(head));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
Eric Dumazetec164392012-05-19 03:02:35 +0000491 sum_truesize = head->truesize;
492 for (fp = head->next; fp;) {
493 bool headstolen;
494 int delta;
495 struct sk_buff *next = fp->next;
496
497 sum_truesize += fp->truesize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 if (head->ip_summed != fp->ip_summed)
499 head->ip_summed = CHECKSUM_NONE;
Patrick McHardy84fa7932006-08-29 16:44:56 -0700500 else if (head->ip_summed == CHECKSUM_COMPLETE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 head->csum = csum_add(head->csum, fp->csum);
Eric Dumazetec164392012-05-19 03:02:35 +0000502
503 if (skb_try_coalesce(head, fp, &headstolen, &delta)) {
504 kfree_skb_partial(fp, headstolen);
505 } else {
506 if (!skb_shinfo(head)->frag_list)
507 skb_shinfo(head)->frag_list = fp;
508 head->data_len += fp->len;
509 head->len += fp->len;
510 head->truesize += fp->truesize;
511 }
512 fp = next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 }
Eric Dumazetec164392012-05-19 03:02:35 +0000514 atomic_sub(sum_truesize, &fq->q.net->mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515
516 head->next = NULL;
517 head->dev = dev;
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700518 head->tstamp = fq->q.stamp;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700519 ipv6_hdr(head)->payload_len = htons(payload_len);
Patrick McHardy951dbc82006-01-06 23:02:34 -0800520 IP6CB(head)->nhoff = nhoff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 /* Yes, and fold redundant checksum back. 8) */
Patrick McHardy84fa7932006-08-29 16:44:56 -0700523 if (head->ip_summed == CHECKSUM_COMPLETE)
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700524 head->csum = csum_partial(skb_network_header(head),
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300525 skb_network_header_len(head),
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700526 head->csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
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_REASMOKS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900530 rcu_read_unlock();
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700531 fq->q.fragments = NULL;
Changli Gaod6bebca2010-06-29 04:39:37 +0000532 fq->q.fragments_tail = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 return 1;
534
535out_oversize:
Joe Perchese87cc472012-05-13 21:56:26 +0000536 net_dbg_ratelimited("ip6_frag_reasm: payload len = %d\n", payload_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 goto out_fail;
538out_oom:
Joe Perchese87cc472012-05-13 21:56:26 +0000539 net_dbg_ratelimited("ip6_frag_reasm: no memory for reassembly\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540out_fail:
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900541 rcu_read_lock();
Jorge Boncompte [DTI2]2bad35b2009-03-18 23:26:11 -0700542 IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
YOSHIFUJI Hideakia11d2062006-11-04 20:11:37 +0900543 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 return -1;
545}
546
Herbert Xue5bbef22007-10-15 12:50:28 -0700547static int ipv6_frag_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 struct frag_hdr *fhdr;
550 struct frag_queue *fq;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000551 const struct ipv6hdr *hdr = ipv6_hdr(skb);
Eric Dumazetadf30902009-06-02 05:19:30 +0000552 struct net *net = dev_net(skb_dst(skb)->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553
Eric Dumazetadf30902009-06-02 05:19:30 +0000554 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
556 /* Jumbo payload inhibits frag. header */
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700557 if (hdr->payload_len==0)
558 goto fail_hdr;
559
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700560 if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700561 sizeof(struct frag_hdr))))
562 goto fail_hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700564 hdr = ipv6_hdr(skb);
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700565 fhdr = (struct frag_hdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
567 if (!(fhdr->frag_off & htons(0xFFF9))) {
568 /* It is not a fragmented frame */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700569 skb->transport_header += sizeof(struct frag_hdr);
Denis V. Lunev483a47d2008-10-08 11:09:27 -0700570 IP6_INC_STATS_BH(net,
Eric Dumazetadf30902009-06-02 05:19:30 +0000571 ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700573 IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 return 1;
575 }
576
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800577 if (atomic_read(&net->ipv6.frags.mem) > net->ipv6.frags.high_thresh)
Eric Dumazetadf30902009-06-02 05:19:30 +0000578 ip6_evictor(net, ip6_dst_idev(skb_dst(skb)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
Shan Wei95463772010-02-11 00:12:45 +0000580 fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr);
581 if (fq != NULL) {
Herbert Xuf61944e2007-10-15 01:28:47 -0700582 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700584 spin_lock(&fq->q.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
Herbert Xuf61944e2007-10-15 01:28:47 -0700586 ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
Pavel Emelyanov5ab11c92007-10-15 02:24:19 -0700588 spin_unlock(&fq->q.lock);
Pavel Emelyanov4b6cb5d2007-10-15 02:41:09 -0700589 fq_put(fq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 return ret;
591 }
592
Eric Dumazetadf30902009-06-02 05:19:30 +0000593 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 kfree_skb(skb);
595 return -1;
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700596
597fail_hdr:
Eric Dumazetadf30902009-06-02 05:19:30 +0000598 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS);
Denis V. Lunev98b3377c2008-10-08 10:31:44 -0700599 icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
600 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601}
602
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000603static const struct inet6_protocol frag_protocol =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604{
605 .handler = ipv6_frag_rcv,
606 .flags = INET6_PROTO_NOPOLICY,
607};
608
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800609#ifdef CONFIG_SYSCTL
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700610static struct ctl_table ip6_frags_ns_ctl_table[] = {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800611 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800612 .procname = "ip6frag_high_thresh",
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800613 .data = &init_net.ipv6.frags.high_thresh,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800614 .maxlen = sizeof(int),
615 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800616 .proc_handler = proc_dointvec
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800617 },
618 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800619 .procname = "ip6frag_low_thresh",
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800620 .data = &init_net.ipv6.frags.low_thresh,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800621 .maxlen = sizeof(int),
622 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800623 .proc_handler = proc_dointvec
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800624 },
625 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800626 .procname = "ip6frag_time",
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800627 .data = &init_net.ipv6.frags.timeout,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800628 .maxlen = sizeof(int),
629 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800630 .proc_handler = proc_dointvec_jiffies,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800631 },
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700632 { }
633};
634
635static struct ctl_table ip6_frags_ctl_table[] = {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800636 {
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800637 .procname = "ip6frag_secret_interval",
Pavel Emelyanov3b4bc4a2008-01-22 06:11:04 -0800638 .data = &ip6_frags.secret_interval,
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_jiffies,
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800642 },
643 { }
644};
Daniel Lezcano7d460db2008-01-18 23:52:35 -0800645
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000646static int __net_init ip6_frags_ns_sysctl_register(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800647{
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800648 struct ctl_table *table;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800649 struct ctl_table_header *hdr;
650
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700651 table = ip6_frags_ns_ctl_table;
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800652 if (!net_eq(net, &init_net)) {
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700653 table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL);
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800654 if (table == NULL)
655 goto err_alloc;
656
Pavel Emelyanove31e0bdc72008-01-22 06:10:13 -0800657 table[0].data = &net->ipv6.frags.high_thresh;
658 table[1].data = &net->ipv6.frags.low_thresh;
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800659 table[2].data = &net->ipv6.frags.timeout;
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800660 }
661
Eric W. Biedermanec8f23c2012-04-19 13:44:49 +0000662 hdr = register_net_sysctl(net, "net/ipv6", table);
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800663 if (hdr == NULL)
664 goto err_reg;
665
666 net->ipv6.sysctl.frags_hdr = hdr;
667 return 0;
668
669err_reg:
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800670 if (!net_eq(net, &init_net))
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800671 kfree(table);
672err_alloc:
673 return -ENOMEM;
674}
675
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000676static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800677{
678 struct ctl_table *table;
679
680 table = net->ipv6.sysctl.frags_hdr->ctl_table_arg;
681 unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
Yang Hongyang3705e112009-12-18 20:25:13 -0800682 if (!net_eq(net, &init_net))
683 kfree(table);
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800684}
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700685
686static struct ctl_table_header *ip6_ctl_header;
687
688static int ip6_frags_sysctl_register(void)
689{
Eric W. Biederman43444752012-04-19 13:22:55 +0000690 ip6_ctl_header = register_net_sysctl(&init_net, "net/ipv6",
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700691 ip6_frags_ctl_table);
692 return ip6_ctl_header == NULL ? -ENOMEM : 0;
693}
694
695static void ip6_frags_sysctl_unregister(void)
696{
697 unregister_net_sysctl_table(ip6_ctl_header);
698}
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800699#else
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700700static inline int ip6_frags_ns_sysctl_register(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800701{
702 return 0;
703}
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800704
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700705static inline void ip6_frags_ns_sysctl_unregister(struct net *net)
Pavel Emelyanove4a2d5c2008-01-22 06:08:36 -0800706{
707}
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700708
709static inline int ip6_frags_sysctl_register(void)
710{
711 return 0;
712}
713
714static inline void ip6_frags_sysctl_unregister(void)
715{
716}
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800717#endif
718
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000719static int __net_init ipv6_frags_init_net(struct net *net)
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800720{
Shan Wei7c070aa2010-01-20 10:42:41 +0100721 net->ipv6.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
722 net->ipv6.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
Pavel Emelyanovb2fd5322008-01-22 06:09:37 -0800723 net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800724
Pavel Emelyanove5a2bb82008-01-22 06:06:23 -0800725 inet_frags_init_net(&net->ipv6.frags);
726
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700727 return ip6_frags_ns_sysctl_register(net);
Daniel Lezcanoe71e0342008-01-10 02:56:03 -0800728}
729
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000730static void __net_exit ipv6_frags_exit_net(struct net *net)
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800731{
Pavel Emelyanov0a64b4b2008-05-19 13:51:29 -0700732 ip6_frags_ns_sysctl_unregister(net);
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800733 inet_frags_exit_net(&net->ipv6.frags, &ip6_frags);
734}
735
736static struct pernet_operations ip6_frags_ops = {
737 .init = ipv6_frags_init_net,
738 .exit = ipv6_frags_exit_net,
739};
740
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800741int __init ipv6_frag_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742{
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800743 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800745 ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT);
746 if (ret)
747 goto out;
Daniel Lezcanoe71e0342008-01-10 02:56:03 -0800748
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700749 ret = ip6_frags_sysctl_register();
750 if (ret)
751 goto err_sysctl;
752
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700753 ret = register_pernet_subsys(&ip6_frags_ops);
754 if (ret)
755 goto err_pernet;
Pavel Emelyanov8d8354d2008-01-22 05:58:31 -0800756
Pavel Emelyanov321a3a92007-10-15 02:38:08 -0700757 ip6_frags.hashfn = ip6_hashfn;
Pavel Emelyanovc6fda282007-10-17 19:46:47 -0700758 ip6_frags.constructor = ip6_frag_init;
Pavel Emelyanovc9547702007-10-17 19:48:26 -0700759 ip6_frags.destructor = NULL;
Pavel Emelyanov1e4b8282007-10-15 02:39:14 -0700760 ip6_frags.skb_free = NULL;
761 ip6_frags.qsize = sizeof(struct frag_queue);
Pavel Emelyanovabd65232007-10-17 19:47:21 -0700762 ip6_frags.match = ip6_frag_match;
Pavel Emelyanove521db92007-10-17 19:45:23 -0700763 ip6_frags.frag_expire = ip6_frag_expire;
Pavel Emelyanov3b4bc4a2008-01-22 06:11:04 -0800764 ip6_frags.secret_interval = 10 * 60 * HZ;
Pavel Emelyanov7eb95152007-10-15 02:31:52 -0700765 inet_frags_init(&ip6_frags);
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800766out:
767 return ret;
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700768
769err_pernet:
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700770 ip6_frags_sysctl_unregister();
771err_sysctl:
Pavel Emelyanov0002c632008-05-19 13:52:28 -0700772 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
773 goto out;
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800774}
775
776void ipv6_frag_exit(void)
777{
778 inet_frags_fini(&ip6_frags);
Pavel Emelyanov7d291eb2008-05-19 13:53:02 -0700779 ip6_frags_sysctl_unregister();
Pavel Emelyanov81566e82008-01-22 06:12:39 -0800780 unregister_pernet_subsys(&ip6_frags_ops);
Daniel Lezcano853cbba2007-12-11 02:24:29 -0800781 inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782}