Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * IPv6 fragment reassembly |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 3 | * Linux INET6 implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Authors: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * 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 Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 16 | /* |
| 17 | * Fixes: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | * 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #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 Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 43 | #include <linux/skbuff.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | #include <net/sock.h> |
| 46 | #include <net/snmp.h> |
| 47 | |
| 48 | #include <net/ipv6.h> |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 49 | #include <net/ip6_route.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #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 Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 55 | #include <net/inet_frag.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | struct 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 | |
| 70 | struct frag_queue |
| 71 | { |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 72 | struct inet_frag_queue q; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 74 | __be32 id; /* fragment id */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | struct in6_addr saddr; |
| 76 | struct in6_addr daddr; |
| 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | int iif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | unsigned int csum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | __u16 nhoffset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | }; |
| 82 | |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 83 | static struct inet_frags ip6_frags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Pavel Emelyanov | e5a2bb8 | 2008-01-22 06:06:23 -0800 | [diff] [blame] | 85 | int ip6_frag_nqueues(struct net *net) |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 86 | { |
Pavel Emelyanov | e5a2bb8 | 2008-01-22 06:06:23 -0800 | [diff] [blame] | 87 | return net->ipv6.frags.nqueues; |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 88 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
Pavel Emelyanov | 6ddc082 | 2008-01-22 06:07:25 -0800 | [diff] [blame] | 90 | int ip6_frag_mem(struct net *net) |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 91 | { |
Pavel Emelyanov | 6ddc082 | 2008-01-22 06:07:25 -0800 | [diff] [blame] | 92 | return atomic_read(&net->ipv6.frags.mem); |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 93 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 95 | static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev, |
| 96 | struct net_device *dev); |
| 97 | |
Zach Brown | f6596f9 | 2006-04-10 16:05:34 -0700 | [diff] [blame] | 98 | /* |
| 99 | * callers should be careful not to use the hash value outside the ipfrag_lock |
| 100 | * as doing so could race with ipfrag_hash_rnd being recalculated. |
| 101 | */ |
Ilpo Järvinen | 93c8b90 | 2008-10-01 02:48:31 -0700 | [diff] [blame] | 102 | unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr, |
| 103 | const struct in6_addr *daddr, u32 rnd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | { |
| 105 | u32 a, b, c; |
| 106 | |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 107 | a = (__force u32)saddr->s6_addr32[0]; |
| 108 | b = (__force u32)saddr->s6_addr32[1]; |
| 109 | c = (__force u32)saddr->s6_addr32[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
| 111 | a += JHASH_GOLDEN_RATIO; |
| 112 | b += JHASH_GOLDEN_RATIO; |
Ilpo Järvinen | 93c8b90 | 2008-10-01 02:48:31 -0700 | [diff] [blame] | 113 | c += rnd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | __jhash_mix(a, b, c); |
| 115 | |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 116 | a += (__force u32)saddr->s6_addr32[3]; |
| 117 | b += (__force u32)daddr->s6_addr32[0]; |
| 118 | c += (__force u32)daddr->s6_addr32[1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | __jhash_mix(a, b, c); |
| 120 | |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 121 | a += (__force u32)daddr->s6_addr32[2]; |
| 122 | b += (__force u32)daddr->s6_addr32[3]; |
| 123 | c += (__force u32)id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | __jhash_mix(a, b, c); |
| 125 | |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 126 | return c & (INETFRAGS_HASHSZ - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | } |
Ilpo Järvinen | 93c8b90 | 2008-10-01 02:48:31 -0700 | [diff] [blame] | 128 | EXPORT_SYMBOL_GPL(inet6_hash_frag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
Pavel Emelyanov | 321a3a9 | 2007-10-15 02:38:08 -0700 | [diff] [blame] | 130 | static unsigned int ip6_hashfn(struct inet_frag_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | { |
Pavel Emelyanov | 321a3a9 | 2007-10-15 02:38:08 -0700 | [diff] [blame] | 132 | struct frag_queue *fq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
Pavel Emelyanov | 321a3a9 | 2007-10-15 02:38:08 -0700 | [diff] [blame] | 134 | fq = container_of(q, struct frag_queue, q); |
Ilpo Järvinen | 93c8b90 | 2008-10-01 02:48:31 -0700 | [diff] [blame] | 135 | return inet6_hash_frag(fq->id, &fq->saddr, &fq->daddr, ip6_frags.rnd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | } |
| 137 | |
Pavel Emelyanov | abd6523 | 2007-10-17 19:47:21 -0700 | [diff] [blame] | 138 | int ip6_frag_match(struct inet_frag_queue *q, void *a) |
| 139 | { |
| 140 | struct frag_queue *fq; |
| 141 | struct ip6_create_arg *arg = a; |
| 142 | |
| 143 | fq = container_of(q, struct frag_queue, q); |
| 144 | return (fq->id == arg->id && |
| 145 | ipv6_addr_equal(&fq->saddr, arg->src) && |
| 146 | ipv6_addr_equal(&fq->daddr, arg->dst)); |
| 147 | } |
| 148 | EXPORT_SYMBOL(ip6_frag_match); |
| 149 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | /* Memory Tracking Functions. */ |
Pavel Emelyanov | 6ddc082 | 2008-01-22 06:07:25 -0800 | [diff] [blame] | 151 | static inline void frag_kfree_skb(struct netns_frags *nf, |
| 152 | struct sk_buff *skb, int *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | { |
| 154 | if (work) |
| 155 | *work -= skb->truesize; |
Pavel Emelyanov | 6ddc082 | 2008-01-22 06:07:25 -0800 | [diff] [blame] | 156 | atomic_sub(skb->truesize, &nf->mem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | kfree_skb(skb); |
| 158 | } |
| 159 | |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 160 | void ip6_frag_init(struct inet_frag_queue *q, void *a) |
| 161 | { |
| 162 | struct frag_queue *fq = container_of(q, struct frag_queue, q); |
| 163 | struct ip6_create_arg *arg = a; |
| 164 | |
| 165 | fq->id = arg->id; |
| 166 | ipv6_addr_copy(&fq->saddr, arg->src); |
| 167 | ipv6_addr_copy(&fq->daddr, arg->dst); |
| 168 | } |
| 169 | EXPORT_SYMBOL(ip6_frag_init); |
| 170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | /* Destruction primitives. */ |
| 172 | |
Pavel Emelyanov | 4b6cb5d | 2007-10-15 02:41:09 -0700 | [diff] [blame] | 173 | static __inline__ void fq_put(struct frag_queue *fq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | { |
Pavel Emelyanov | 762cc40 | 2007-10-15 02:41:56 -0700 | [diff] [blame] | 175 | inet_frag_put(&fq->q, &ip6_frags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | } |
| 177 | |
| 178 | /* Kill fq entry. It is not destroyed immediately, |
| 179 | * because caller (and someone more) holds reference count. |
| 180 | */ |
| 181 | static __inline__ void fq_kill(struct frag_queue *fq) |
| 182 | { |
Pavel Emelyanov | 277e650 | 2007-10-15 02:37:18 -0700 | [diff] [blame] | 183 | inet_frag_kill(&fq->q, &ip6_frags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | } |
| 185 | |
Pavel Emelyanov | 6ddc082 | 2008-01-22 06:07:25 -0800 | [diff] [blame] | 186 | static void ip6_evictor(struct net *net, struct inet6_dev *idev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | { |
Pavel Emelyanov | 8e7999c | 2007-10-15 02:40:06 -0700 | [diff] [blame] | 188 | int evicted; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
Pavel Emelyanov | 6ddc082 | 2008-01-22 06:07:25 -0800 | [diff] [blame] | 190 | evicted = inet_frag_evictor(&net->ipv6.frags, &ip6_frags); |
Pavel Emelyanov | 8e7999c | 2007-10-15 02:40:06 -0700 | [diff] [blame] | 191 | if (evicted) |
Denis V. Lunev | 821d577 | 2008-10-08 10:32:43 -0700 | [diff] [blame] | 192 | IP6_ADD_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS, evicted); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | } |
| 194 | |
| 195 | static void ip6_frag_expire(unsigned long data) |
| 196 | { |
Pavel Emelyanov | e521db9 | 2007-10-17 19:45:23 -0700 | [diff] [blame] | 197 | struct frag_queue *fq; |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 198 | struct net_device *dev = NULL; |
Daniel Lezcano | 4ac2ccd | 2008-05-02 17:02:03 -0700 | [diff] [blame] | 199 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
Pavel Emelyanov | e521db9 | 2007-10-17 19:45:23 -0700 | [diff] [blame] | 201 | fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q); |
| 202 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 203 | spin_lock(&fq->q.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
Joe Perches | bc578a5 | 2008-03-28 16:35:27 -0700 | [diff] [blame] | 205 | if (fq->q.last_in & INET_FRAG_COMPLETE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | goto out; |
| 207 | |
| 208 | fq_kill(fq); |
| 209 | |
Daniel Lezcano | 4ac2ccd | 2008-05-02 17:02:03 -0700 | [diff] [blame] | 210 | net = container_of(fq->q.net, struct net, ipv6.frags); |
| 211 | dev = dev_get_by_index(net, fq->iif); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 212 | if (!dev) |
| 213 | goto out; |
| 214 | |
| 215 | rcu_read_lock(); |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 216 | IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT); |
| 217 | IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 218 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
Ingo Oeser | 78c784c | 2006-03-20 23:01:17 -0800 | [diff] [blame] | 220 | /* Don't send error if the first segment did not arrive. */ |
Joe Perches | bc578a5 | 2008-03-28 16:35:27 -0700 | [diff] [blame] | 221 | if (!(fq->q.last_in & INET_FRAG_FIRST_IN) || !fq->q.fragments) |
Ingo Oeser | 78c784c | 2006-03-20 23:01:17 -0800 | [diff] [blame] | 222 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
Ingo Oeser | 78c784c | 2006-03-20 23:01:17 -0800 | [diff] [blame] | 224 | /* |
| 225 | But use as source device on which LAST ARRIVED |
| 226 | segment was received. And do not use fq->dev |
| 227 | pointer directly, device might already disappeared. |
| 228 | */ |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 229 | fq->q.fragments->dev = dev; |
| 230 | icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | out: |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 232 | if (dev) |
| 233 | dev_put(dev); |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 234 | spin_unlock(&fq->q.lock); |
Pavel Emelyanov | 4b6cb5d | 2007-10-15 02:41:09 -0700 | [diff] [blame] | 235 | fq_put(fq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | } |
| 237 | |
Pavel Emelyanov | abd6523 | 2007-10-17 19:47:21 -0700 | [diff] [blame] | 238 | static __inline__ struct frag_queue * |
Pavel Emelyanov | ac18e75 | 2008-01-22 06:02:14 -0800 | [diff] [blame] | 239 | fq_find(struct net *net, __be32 id, struct in6_addr *src, struct in6_addr *dst, |
Pavel Emelyanov | abd6523 | 2007-10-17 19:47:21 -0700 | [diff] [blame] | 240 | struct inet6_dev *idev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | { |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 242 | struct inet_frag_queue *q; |
| 243 | struct ip6_create_arg arg; |
Pavel Emelyanov | abd6523 | 2007-10-17 19:47:21 -0700 | [diff] [blame] | 244 | unsigned int hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 246 | arg.id = id; |
| 247 | arg.src = src; |
| 248 | arg.dst = dst; |
Pavel Emelyanov | 9a37580 | 2008-06-27 20:06:08 -0700 | [diff] [blame] | 249 | |
| 250 | read_lock(&ip6_frags.lock); |
Ilpo Järvinen | 93c8b90 | 2008-10-01 02:48:31 -0700 | [diff] [blame] | 251 | hash = inet6_hash_frag(id, src, dst, ip6_frags.rnd); |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 252 | |
Pavel Emelyanov | ac18e75 | 2008-01-22 06:02:14 -0800 | [diff] [blame] | 253 | q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash); |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 254 | if (q == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | goto oom; |
| 256 | |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 257 | return container_of(q, struct frag_queue, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
| 259 | oom: |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 260 | IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | return NULL; |
| 262 | } |
| 263 | |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 264 | static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | struct frag_hdr *fhdr, int nhoff) |
| 266 | { |
| 267 | struct sk_buff *prev, *next; |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 268 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | int offset, end; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 270 | struct net *net = dev_net(skb_dst(skb)->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
Joe Perches | bc578a5 | 2008-03-28 16:35:27 -0700 | [diff] [blame] | 272 | if (fq->q.last_in & INET_FRAG_COMPLETE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | goto err; |
| 274 | |
| 275 | offset = ntohs(fhdr->frag_off) & ~0x7; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 276 | end = offset + (ntohs(ipv6_hdr(skb)->payload_len) - |
| 277 | ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | |
| 279 | if ((unsigned int)end > IPV6_MAXPLEN) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 280 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 281 | IPSTATS_MIB_INHDRERRORS); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 282 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
| 283 | ((u8 *)&fhdr->frag_off - |
| 284 | skb_network_header(skb))); |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 285 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | } |
| 287 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 288 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
| 289 | const unsigned char *nh = skb_network_header(skb); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 290 | skb->csum = csum_sub(skb->csum, |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 291 | csum_partial(nh, (u8 *)(fhdr + 1) - nh, |
| 292 | 0)); |
| 293 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
| 295 | /* Is this the final fragment? */ |
| 296 | if (!(fhdr->frag_off & htons(IP6_MF))) { |
| 297 | /* If we already have some bits beyond end |
| 298 | * or have different end, the segment is corrupted. |
| 299 | */ |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 300 | if (end < fq->q.len || |
Joe Perches | bc578a5 | 2008-03-28 16:35:27 -0700 | [diff] [blame] | 301 | ((fq->q.last_in & INET_FRAG_LAST_IN) && end != fq->q.len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | goto err; |
Joe Perches | bc578a5 | 2008-03-28 16:35:27 -0700 | [diff] [blame] | 303 | fq->q.last_in |= INET_FRAG_LAST_IN; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 304 | fq->q.len = end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | } else { |
| 306 | /* Check if the fragment is rounded to 8 bytes. |
| 307 | * Required by the RFC. |
| 308 | */ |
| 309 | if (end & 0x7) { |
| 310 | /* RFC2460 says always send parameter problem in |
| 311 | * this case. -DaveM |
| 312 | */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 313 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 314 | IPSTATS_MIB_INHDRERRORS); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 315 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | offsetof(struct ipv6hdr, payload_len)); |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 317 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | } |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 319 | if (end > fq->q.len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | /* Some bits beyond end -> corruption. */ |
Joe Perches | bc578a5 | 2008-03-28 16:35:27 -0700 | [diff] [blame] | 321 | if (fq->q.last_in & INET_FRAG_LAST_IN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | goto err; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 323 | fq->q.len = end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | } |
| 325 | } |
| 326 | |
| 327 | if (end == offset) |
| 328 | goto err; |
| 329 | |
| 330 | /* Point into the IP datagram 'data' part. */ |
| 331 | if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data)) |
| 332 | goto err; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 333 | |
Stephen Hemminger | 42ca89c | 2005-09-08 12:57:43 -0700 | [diff] [blame] | 334 | if (pskb_trim_rcsum(skb, end - offset)) |
| 335 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | |
| 337 | /* Find out which fragments are in front and at the back of us |
| 338 | * in the chain of fragments so far. We must know where to put |
| 339 | * this fragment, right? |
| 340 | */ |
| 341 | prev = NULL; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 342 | for(next = fq->q.fragments; next != NULL; next = next->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | if (FRAG6_CB(next)->offset >= offset) |
| 344 | break; /* bingo! */ |
| 345 | prev = next; |
| 346 | } |
| 347 | |
| 348 | /* We found where to put this one. Check for overlap with |
| 349 | * preceding fragment, and, if needed, align things so that |
| 350 | * any overlaps are eliminated. |
| 351 | */ |
| 352 | if (prev) { |
| 353 | int i = (FRAG6_CB(prev)->offset + prev->len) - offset; |
| 354 | |
| 355 | if (i > 0) { |
| 356 | offset += i; |
| 357 | if (end <= offset) |
| 358 | goto err; |
| 359 | if (!pskb_pull(skb, i)) |
| 360 | goto err; |
| 361 | if (skb->ip_summed != CHECKSUM_UNNECESSARY) |
| 362 | skb->ip_summed = CHECKSUM_NONE; |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | /* Look for overlap with succeeding segments. |
| 367 | * If we can merge fragments, do it. |
| 368 | */ |
| 369 | while (next && FRAG6_CB(next)->offset < end) { |
| 370 | int i = end - FRAG6_CB(next)->offset; /* overlap is 'i' bytes */ |
| 371 | |
| 372 | if (i < next->len) { |
| 373 | /* Eat head of the next overlapped fragment |
| 374 | * and leave the loop. The next ones cannot overlap. |
| 375 | */ |
| 376 | if (!pskb_pull(next, i)) |
| 377 | goto err; |
| 378 | FRAG6_CB(next)->offset += i; /* next fragment */ |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 379 | fq->q.meat -= i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | if (next->ip_summed != CHECKSUM_UNNECESSARY) |
| 381 | next->ip_summed = CHECKSUM_NONE; |
| 382 | break; |
| 383 | } else { |
| 384 | struct sk_buff *free_it = next; |
| 385 | |
| 386 | /* Old fragment is completely overridden with |
| 387 | * new one drop it. |
| 388 | */ |
| 389 | next = next->next; |
| 390 | |
| 391 | if (prev) |
| 392 | prev->next = next; |
| 393 | else |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 394 | fq->q.fragments = next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 396 | fq->q.meat -= free_it->len; |
Pavel Emelyanov | 6ddc082 | 2008-01-22 06:07:25 -0800 | [diff] [blame] | 397 | frag_kfree_skb(fq->q.net, free_it, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | } |
| 399 | } |
| 400 | |
| 401 | FRAG6_CB(skb)->offset = offset; |
| 402 | |
| 403 | /* Insert this fragment in the chain of fragments. */ |
| 404 | skb->next = next; |
| 405 | if (prev) |
| 406 | prev->next = skb; |
| 407 | else |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 408 | fq->q.fragments = skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 410 | dev = skb->dev; |
| 411 | if (dev) { |
| 412 | fq->iif = dev->ifindex; |
| 413 | skb->dev = NULL; |
| 414 | } |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 415 | fq->q.stamp = skb->tstamp; |
| 416 | fq->q.meat += skb->len; |
Pavel Emelyanov | 6ddc082 | 2008-01-22 06:07:25 -0800 | [diff] [blame] | 417 | atomic_add(skb->truesize, &fq->q.net->mem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | |
| 419 | /* The first fragment. |
| 420 | * nhoffset is obtained from the first fragment, of course. |
| 421 | */ |
| 422 | if (offset == 0) { |
| 423 | fq->nhoffset = nhoff; |
Joe Perches | bc578a5 | 2008-03-28 16:35:27 -0700 | [diff] [blame] | 424 | fq->q.last_in |= INET_FRAG_FIRST_IN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | } |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 426 | |
Joe Perches | bc578a5 | 2008-03-28 16:35:27 -0700 | [diff] [blame] | 427 | if (fq->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) && |
| 428 | fq->q.meat == fq->q.len) |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 429 | return ip6_frag_reasm(fq, prev, dev); |
| 430 | |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 431 | write_lock(&ip6_frags.lock); |
Pavel Emelyanov | 3140c25 | 2008-01-22 06:11:48 -0800 | [diff] [blame] | 432 | list_move_tail(&fq->q.lru_list, &fq->q.net->lru_list); |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 433 | write_unlock(&ip6_frags.lock); |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 434 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | |
| 436 | err: |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 437 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 438 | IPSTATS_MIB_REASMFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | kfree_skb(skb); |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 440 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | } |
| 442 | |
| 443 | /* |
| 444 | * Check if this packet is complete. |
| 445 | * Returns NULL on failure by any reason, and pointer |
| 446 | * to current nexthdr field in reassembled frame. |
| 447 | * |
| 448 | * It is called with locked fq, and caller must check that |
| 449 | * queue is eligible for reassembly i.e. it is not COMPLETE, |
| 450 | * the last and the first frames arrived and all the bits are here. |
| 451 | */ |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 452 | static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | struct net_device *dev) |
| 454 | { |
Jorge Boncompte [DTI2] | 2bad35b | 2009-03-18 23:26:11 -0700 | [diff] [blame] | 455 | struct net *net = container_of(fq->q.net, struct net, ipv6.frags); |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 456 | struct sk_buff *fp, *head = fq->q.fragments; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | int payload_len; |
| 458 | unsigned int nhoff; |
| 459 | |
| 460 | fq_kill(fq); |
| 461 | |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 462 | /* Make the one we just received the head. */ |
| 463 | if (prev) { |
| 464 | head = prev->next; |
| 465 | fp = skb_clone(head, GFP_ATOMIC); |
| 466 | |
| 467 | if (!fp) |
| 468 | goto out_oom; |
| 469 | |
| 470 | fp->next = head->next; |
| 471 | prev->next = fp; |
| 472 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 473 | skb_morph(head, fq->q.fragments); |
| 474 | head->next = fq->q.fragments->next; |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 475 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 476 | kfree_skb(fq->q.fragments); |
| 477 | fq->q.fragments = head; |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 478 | } |
| 479 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 480 | WARN_ON(head == NULL); |
| 481 | WARN_ON(FRAG6_CB(head)->offset != 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
| 483 | /* Unfragmented part is taken from the first segment. */ |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 484 | payload_len = ((head->data - skb_network_header(head)) - |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 485 | sizeof(struct ipv6hdr) + fq->q.len - |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 486 | sizeof(struct frag_hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | if (payload_len > IPV6_MAXPLEN) |
| 488 | goto out_oversize; |
| 489 | |
| 490 | /* Head of list must not be cloned. */ |
| 491 | if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC)) |
| 492 | goto out_oom; |
| 493 | |
| 494 | /* If the first fragment is fragmented itself, we split |
| 495 | * it to two chunks: the first with data and paged part |
| 496 | * and the second, holding only fragments. */ |
David S. Miller | 4d9092b | 2009-06-09 00:20:05 -0700 | [diff] [blame] | 497 | if (skb_has_frags(head)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | struct sk_buff *clone; |
| 499 | int i, plen = 0; |
| 500 | |
| 501 | if ((clone = alloc_skb(0, GFP_ATOMIC)) == NULL) |
| 502 | goto out_oom; |
| 503 | clone->next = head->next; |
| 504 | head->next = clone; |
| 505 | skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list; |
David S. Miller | 4d9092b | 2009-06-09 00:20:05 -0700 | [diff] [blame] | 506 | skb_frag_list_init(head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | for (i=0; i<skb_shinfo(head)->nr_frags; i++) |
| 508 | plen += skb_shinfo(head)->frags[i].size; |
| 509 | clone->len = clone->data_len = head->data_len - plen; |
| 510 | head->data_len -= clone->len; |
| 511 | head->len -= clone->len; |
| 512 | clone->csum = 0; |
| 513 | clone->ip_summed = head->ip_summed; |
Pavel Emelyanov | 6ddc082 | 2008-01-22 06:07:25 -0800 | [diff] [blame] | 514 | atomic_add(clone->truesize, &fq->q.net->mem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | } |
| 516 | |
| 517 | /* We have to remove fragment header from datagram and to relocate |
| 518 | * header in order to calculate ICV correctly. */ |
| 519 | nhoff = fq->nhoffset; |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 520 | skb_network_header(head)[nhoff] = skb_transport_header(head)[0]; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 521 | memmove(head->head + sizeof(struct frag_hdr), head->head, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | (head->data - head->head) - sizeof(struct frag_hdr)); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 523 | head->mac_header += sizeof(struct frag_hdr); |
| 524 | head->network_header += sizeof(struct frag_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | |
| 526 | skb_shinfo(head)->frag_list = head->next; |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 527 | skb_reset_transport_header(head); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 528 | skb_push(head, head->data - skb_network_header(head)); |
Pavel Emelyanov | 6ddc082 | 2008-01-22 06:07:25 -0800 | [diff] [blame] | 529 | atomic_sub(head->truesize, &fq->q.net->mem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | |
| 531 | for (fp=head->next; fp; fp = fp->next) { |
| 532 | head->data_len += fp->len; |
| 533 | head->len += fp->len; |
| 534 | if (head->ip_summed != fp->ip_summed) |
| 535 | head->ip_summed = CHECKSUM_NONE; |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 536 | else if (head->ip_summed == CHECKSUM_COMPLETE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | head->csum = csum_add(head->csum, fp->csum); |
| 538 | head->truesize += fp->truesize; |
Pavel Emelyanov | 6ddc082 | 2008-01-22 06:07:25 -0800 | [diff] [blame] | 539 | atomic_sub(fp->truesize, &fq->q.net->mem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | } |
| 541 | |
| 542 | head->next = NULL; |
| 543 | head->dev = dev; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 544 | head->tstamp = fq->q.stamp; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 545 | ipv6_hdr(head)->payload_len = htons(payload_len); |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 546 | IP6CB(head)->nhoff = nhoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | /* Yes, and fold redundant checksum back. 8) */ |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 549 | if (head->ip_summed == CHECKSUM_COMPLETE) |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 550 | head->csum = csum_partial(skb_network_header(head), |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 551 | skb_network_header_len(head), |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 552 | head->csum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 554 | rcu_read_lock(); |
Jorge Boncompte [DTI2] | 2bad35b | 2009-03-18 23:26:11 -0700 | [diff] [blame] | 555 | IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 556 | rcu_read_unlock(); |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 557 | fq->q.fragments = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | return 1; |
| 559 | |
| 560 | out_oversize: |
| 561 | if (net_ratelimit()) |
| 562 | printk(KERN_DEBUG "ip6_frag_reasm: payload len = %d\n", payload_len); |
| 563 | goto out_fail; |
| 564 | out_oom: |
| 565 | if (net_ratelimit()) |
| 566 | printk(KERN_DEBUG "ip6_frag_reasm: no memory for reassembly\n"); |
| 567 | out_fail: |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 568 | rcu_read_lock(); |
Jorge Boncompte [DTI2] | 2bad35b | 2009-03-18 23:26:11 -0700 | [diff] [blame] | 569 | IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 570 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | return -1; |
| 572 | } |
| 573 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 574 | static int ipv6_frag_rcv(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | struct frag_hdr *fhdr; |
| 577 | struct frag_queue *fq; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 578 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 579 | struct net *net = dev_net(skb_dst(skb)->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 581 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | |
| 583 | /* Jumbo payload inhibits frag. header */ |
Denis V. Lunev | 98b3377c | 2008-10-08 10:31:44 -0700 | [diff] [blame] | 584 | if (hdr->payload_len==0) |
| 585 | goto fail_hdr; |
| 586 | |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 587 | if (!pskb_may_pull(skb, (skb_transport_offset(skb) + |
Denis V. Lunev | 98b3377c | 2008-10-08 10:31:44 -0700 | [diff] [blame] | 588 | sizeof(struct frag_hdr)))) |
| 589 | goto fail_hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 591 | hdr = ipv6_hdr(skb); |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 592 | fhdr = (struct frag_hdr *)skb_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
| 594 | if (!(fhdr->frag_off & htons(0xFFF9))) { |
| 595 | /* It is not a fragmented frame */ |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 596 | skb->transport_header += sizeof(struct frag_hdr); |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 597 | IP6_INC_STATS_BH(net, |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 598 | ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 600 | IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | return 1; |
| 602 | } |
| 603 | |
Pavel Emelyanov | e31e0bdc7 | 2008-01-22 06:10:13 -0800 | [diff] [blame] | 604 | if (atomic_read(&net->ipv6.frags.mem) > net->ipv6.frags.high_thresh) |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 605 | ip6_evictor(net, ip6_dst_idev(skb_dst(skb))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
Pavel Emelyanov | ac18e75 | 2008-01-22 06:02:14 -0800 | [diff] [blame] | 607 | if ((fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr, |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 608 | ip6_dst_idev(skb_dst(skb)))) != NULL) { |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 609 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 611 | spin_lock(&fq->q.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | |
Herbert Xu | f61944e | 2007-10-15 01:28:47 -0700 | [diff] [blame] | 613 | ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 615 | spin_unlock(&fq->q.lock); |
Pavel Emelyanov | 4b6cb5d | 2007-10-15 02:41:09 -0700 | [diff] [blame] | 616 | fq_put(fq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | return ret; |
| 618 | } |
| 619 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 620 | IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | kfree_skb(skb); |
| 622 | return -1; |
Denis V. Lunev | 98b3377c | 2008-10-08 10:31:44 -0700 | [diff] [blame] | 623 | |
| 624 | fail_hdr: |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 625 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS); |
Denis V. Lunev | 98b3377c | 2008-10-08 10:31:44 -0700 | [diff] [blame] | 626 | icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb)); |
| 627 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | } |
| 629 | |
| 630 | static struct inet6_protocol frag_protocol = |
| 631 | { |
| 632 | .handler = ipv6_frag_rcv, |
| 633 | .flags = INET6_PROTO_NOPOLICY, |
| 634 | }; |
| 635 | |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 636 | #ifdef CONFIG_SYSCTL |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 637 | static struct ctl_table ip6_frags_ns_ctl_table[] = { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 638 | { |
| 639 | .ctl_name = NET_IPV6_IP6FRAG_HIGH_THRESH, |
| 640 | .procname = "ip6frag_high_thresh", |
Pavel Emelyanov | e31e0bdc7 | 2008-01-22 06:10:13 -0800 | [diff] [blame] | 641 | .data = &init_net.ipv6.frags.high_thresh, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 642 | .maxlen = sizeof(int), |
| 643 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 644 | .proc_handler = proc_dointvec |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 645 | }, |
| 646 | { |
| 647 | .ctl_name = NET_IPV6_IP6FRAG_LOW_THRESH, |
| 648 | .procname = "ip6frag_low_thresh", |
Pavel Emelyanov | e31e0bdc7 | 2008-01-22 06:10:13 -0800 | [diff] [blame] | 649 | .data = &init_net.ipv6.frags.low_thresh, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 650 | .maxlen = sizeof(int), |
| 651 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 652 | .proc_handler = proc_dointvec |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 653 | }, |
| 654 | { |
| 655 | .ctl_name = NET_IPV6_IP6FRAG_TIME, |
| 656 | .procname = "ip6frag_time", |
Pavel Emelyanov | b2fd532 | 2008-01-22 06:09:37 -0800 | [diff] [blame] | 657 | .data = &init_net.ipv6.frags.timeout, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 658 | .maxlen = sizeof(int), |
| 659 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 660 | .proc_handler = proc_dointvec_jiffies, |
| 661 | .strategy = sysctl_jiffies, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 662 | }, |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 663 | { } |
| 664 | }; |
| 665 | |
| 666 | static struct ctl_table ip6_frags_ctl_table[] = { |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 667 | { |
| 668 | .ctl_name = NET_IPV6_IP6FRAG_SECRET_INTERVAL, |
| 669 | .procname = "ip6frag_secret_interval", |
Pavel Emelyanov | 3b4bc4a | 2008-01-22 06:11:04 -0800 | [diff] [blame] | 670 | .data = &ip6_frags.secret_interval, |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 671 | .maxlen = sizeof(int), |
| 672 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 673 | .proc_handler = proc_dointvec_jiffies, |
| 674 | .strategy = sysctl_jiffies |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 675 | }, |
| 676 | { } |
| 677 | }; |
Daniel Lezcano | 7d460db | 2008-01-18 23:52:35 -0800 | [diff] [blame] | 678 | |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 679 | static int ip6_frags_ns_sysctl_register(struct net *net) |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 680 | { |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 681 | struct ctl_table *table; |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 682 | struct ctl_table_header *hdr; |
| 683 | |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 684 | table = ip6_frags_ns_ctl_table; |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 685 | if (net != &init_net) { |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 686 | table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL); |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 687 | if (table == NULL) |
| 688 | goto err_alloc; |
| 689 | |
Pavel Emelyanov | e31e0bdc7 | 2008-01-22 06:10:13 -0800 | [diff] [blame] | 690 | table[0].data = &net->ipv6.frags.high_thresh; |
| 691 | table[1].data = &net->ipv6.frags.low_thresh; |
Pavel Emelyanov | b2fd532 | 2008-01-22 06:09:37 -0800 | [diff] [blame] | 692 | table[2].data = &net->ipv6.frags.timeout; |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 693 | } |
| 694 | |
| 695 | hdr = register_net_sysctl_table(net, net_ipv6_ctl_path, table); |
| 696 | if (hdr == NULL) |
| 697 | goto err_reg; |
| 698 | |
| 699 | net->ipv6.sysctl.frags_hdr = hdr; |
| 700 | return 0; |
| 701 | |
| 702 | err_reg: |
| 703 | if (net != &init_net) |
| 704 | kfree(table); |
| 705 | err_alloc: |
| 706 | return -ENOMEM; |
| 707 | } |
| 708 | |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 709 | static void ip6_frags_ns_sysctl_unregister(struct net *net) |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 710 | { |
| 711 | struct ctl_table *table; |
| 712 | |
| 713 | table = net->ipv6.sysctl.frags_hdr->ctl_table_arg; |
| 714 | unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr); |
| 715 | kfree(table); |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 716 | } |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 717 | |
| 718 | static struct ctl_table_header *ip6_ctl_header; |
| 719 | |
| 720 | static int ip6_frags_sysctl_register(void) |
| 721 | { |
| 722 | ip6_ctl_header = register_net_sysctl_rotable(net_ipv6_ctl_path, |
| 723 | ip6_frags_ctl_table); |
| 724 | return ip6_ctl_header == NULL ? -ENOMEM : 0; |
| 725 | } |
| 726 | |
| 727 | static void ip6_frags_sysctl_unregister(void) |
| 728 | { |
| 729 | unregister_net_sysctl_table(ip6_ctl_header); |
| 730 | } |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 731 | #else |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 732 | static inline int ip6_frags_ns_sysctl_register(struct net *net) |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 733 | { |
| 734 | return 0; |
| 735 | } |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 736 | |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 737 | static inline void ip6_frags_ns_sysctl_unregister(struct net *net) |
Pavel Emelyanov | e4a2d5c | 2008-01-22 06:08:36 -0800 | [diff] [blame] | 738 | { |
| 739 | } |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 740 | |
| 741 | static inline int ip6_frags_sysctl_register(void) |
| 742 | { |
| 743 | return 0; |
| 744 | } |
| 745 | |
| 746 | static inline void ip6_frags_sysctl_unregister(void) |
| 747 | { |
| 748 | } |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 749 | #endif |
| 750 | |
| 751 | static int ipv6_frags_init_net(struct net *net) |
| 752 | { |
Pavel Emelyanov | e31e0bdc7 | 2008-01-22 06:10:13 -0800 | [diff] [blame] | 753 | net->ipv6.frags.high_thresh = 256 * 1024; |
| 754 | net->ipv6.frags.low_thresh = 192 * 1024; |
Pavel Emelyanov | b2fd532 | 2008-01-22 06:09:37 -0800 | [diff] [blame] | 755 | net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT; |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 756 | |
Pavel Emelyanov | e5a2bb8 | 2008-01-22 06:06:23 -0800 | [diff] [blame] | 757 | inet_frags_init_net(&net->ipv6.frags); |
| 758 | |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 759 | return ip6_frags_ns_sysctl_register(net); |
Daniel Lezcano | e71e034 | 2008-01-10 02:56:03 -0800 | [diff] [blame] | 760 | } |
| 761 | |
Pavel Emelyanov | 81566e8 | 2008-01-22 06:12:39 -0800 | [diff] [blame] | 762 | static void ipv6_frags_exit_net(struct net *net) |
| 763 | { |
Pavel Emelyanov | 0a64b4b | 2008-05-19 13:51:29 -0700 | [diff] [blame] | 764 | ip6_frags_ns_sysctl_unregister(net); |
Pavel Emelyanov | 81566e8 | 2008-01-22 06:12:39 -0800 | [diff] [blame] | 765 | inet_frags_exit_net(&net->ipv6.frags, &ip6_frags); |
| 766 | } |
| 767 | |
| 768 | static struct pernet_operations ip6_frags_ops = { |
| 769 | .init = ipv6_frags_init_net, |
| 770 | .exit = ipv6_frags_exit_net, |
| 771 | }; |
| 772 | |
Daniel Lezcano | 853cbba | 2007-12-11 02:24:29 -0800 | [diff] [blame] | 773 | int __init ipv6_frag_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | { |
Daniel Lezcano | 853cbba | 2007-12-11 02:24:29 -0800 | [diff] [blame] | 775 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | |
Daniel Lezcano | 853cbba | 2007-12-11 02:24:29 -0800 | [diff] [blame] | 777 | ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
| 778 | if (ret) |
| 779 | goto out; |
Daniel Lezcano | e71e034 | 2008-01-10 02:56:03 -0800 | [diff] [blame] | 780 | |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 781 | ret = ip6_frags_sysctl_register(); |
| 782 | if (ret) |
| 783 | goto err_sysctl; |
| 784 | |
Pavel Emelyanov | 0002c63 | 2008-05-19 13:52:28 -0700 | [diff] [blame] | 785 | ret = register_pernet_subsys(&ip6_frags_ops); |
| 786 | if (ret) |
| 787 | goto err_pernet; |
Pavel Emelyanov | 8d8354d | 2008-01-22 05:58:31 -0800 | [diff] [blame] | 788 | |
Pavel Emelyanov | 321a3a9 | 2007-10-15 02:38:08 -0700 | [diff] [blame] | 789 | ip6_frags.hashfn = ip6_hashfn; |
Pavel Emelyanov | c6fda28 | 2007-10-17 19:46:47 -0700 | [diff] [blame] | 790 | ip6_frags.constructor = ip6_frag_init; |
Pavel Emelyanov | c954770 | 2007-10-17 19:48:26 -0700 | [diff] [blame] | 791 | ip6_frags.destructor = NULL; |
Pavel Emelyanov | 1e4b828 | 2007-10-15 02:39:14 -0700 | [diff] [blame] | 792 | ip6_frags.skb_free = NULL; |
| 793 | ip6_frags.qsize = sizeof(struct frag_queue); |
Pavel Emelyanov | abd6523 | 2007-10-17 19:47:21 -0700 | [diff] [blame] | 794 | ip6_frags.match = ip6_frag_match; |
Pavel Emelyanov | e521db9 | 2007-10-17 19:45:23 -0700 | [diff] [blame] | 795 | ip6_frags.frag_expire = ip6_frag_expire; |
Pavel Emelyanov | 3b4bc4a | 2008-01-22 06:11:04 -0800 | [diff] [blame] | 796 | ip6_frags.secret_interval = 10 * 60 * HZ; |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 797 | inet_frags_init(&ip6_frags); |
Daniel Lezcano | 853cbba | 2007-12-11 02:24:29 -0800 | [diff] [blame] | 798 | out: |
| 799 | return ret; |
Pavel Emelyanov | 0002c63 | 2008-05-19 13:52:28 -0700 | [diff] [blame] | 800 | |
| 801 | err_pernet: |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 802 | ip6_frags_sysctl_unregister(); |
| 803 | err_sysctl: |
Pavel Emelyanov | 0002c63 | 2008-05-19 13:52:28 -0700 | [diff] [blame] | 804 | inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
| 805 | goto out; |
Daniel Lezcano | 853cbba | 2007-12-11 02:24:29 -0800 | [diff] [blame] | 806 | } |
| 807 | |
| 808 | void ipv6_frag_exit(void) |
| 809 | { |
| 810 | inet_frags_fini(&ip6_frags); |
Pavel Emelyanov | 7d291eb | 2008-05-19 13:53:02 -0700 | [diff] [blame] | 811 | ip6_frags_sysctl_unregister(); |
Pavel Emelyanov | 81566e8 | 2008-01-22 06:12:39 -0800 | [diff] [blame] | 812 | unregister_pernet_subsys(&ip6_frags_ops); |
Daniel Lezcano | 853cbba | 2007-12-11 02:24:29 -0800 | [diff] [blame] | 813 | inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | } |