Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1 | /* |
| 2 | * IPv6 fragment reassembly for connection tracking |
| 3 | * |
| 4 | * Copyright (C)2004 USAGI/WIDE Project |
| 5 | * |
| 6 | * Author: |
| 7 | * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> |
| 8 | * |
| 9 | * Based on: net/ipv6/reassembly.c |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License |
| 13 | * as published by the Free Software Foundation; either version |
| 14 | * 2 of the License, or (at your option) any later version. |
| 15 | */ |
| 16 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 17 | #include <linux/errno.h> |
| 18 | #include <linux/types.h> |
| 19 | #include <linux/string.h> |
| 20 | #include <linux/socket.h> |
| 21 | #include <linux/sockios.h> |
| 22 | #include <linux/jiffies.h> |
| 23 | #include <linux/net.h> |
| 24 | #include <linux/list.h> |
| 25 | #include <linux/netdevice.h> |
| 26 | #include <linux/in6.h> |
| 27 | #include <linux/ipv6.h> |
| 28 | #include <linux/icmpv6.h> |
| 29 | #include <linux/random.h> |
| 30 | #include <linux/jhash.h> |
| 31 | |
| 32 | #include <net/sock.h> |
| 33 | #include <net/snmp.h> |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 34 | #include <net/inet_frag.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 35 | |
| 36 | #include <net/ipv6.h> |
| 37 | #include <net/protocol.h> |
| 38 | #include <net/transp_v6.h> |
| 39 | #include <net/rawv6.h> |
| 40 | #include <net/ndisc.h> |
| 41 | #include <net/addrconf.h> |
| 42 | #include <linux/sysctl.h> |
| 43 | #include <linux/netfilter.h> |
| 44 | #include <linux/netfilter_ipv6.h> |
| 45 | #include <linux/kernel.h> |
| 46 | #include <linux/module.h> |
| 47 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 48 | #define NF_CT_FRAG6_HIGH_THRESH 262144 /* == 256*1024 */ |
| 49 | #define NF_CT_FRAG6_LOW_THRESH 196608 /* == 192*1024 */ |
| 50 | #define NF_CT_FRAG6_TIMEOUT IPV6_FRAG_TIMEOUT |
| 51 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 52 | struct nf_ct_frag6_skb_cb |
| 53 | { |
| 54 | struct inet6_skb_parm h; |
| 55 | int offset; |
| 56 | struct sk_buff *orig; |
| 57 | }; |
| 58 | |
| 59 | #define NFCT_FRAG6_CB(skb) ((struct nf_ct_frag6_skb_cb*)((skb)->cb)) |
| 60 | |
| 61 | struct nf_ct_frag6_queue |
| 62 | { |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 63 | struct inet_frag_queue q; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 64 | |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 65 | __be32 id; /* fragment id */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 66 | struct in6_addr saddr; |
| 67 | struct in6_addr daddr; |
| 68 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 69 | unsigned int csum; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 70 | __u16 nhoffset; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 71 | }; |
| 72 | |
Pavel Emelyanov | 04128f2 | 2007-10-15 02:33:45 -0700 | [diff] [blame^] | 73 | struct inet_frags_ctl nf_frags_ctl __read_mostly = { |
| 74 | .high_thresh = 256 * 1024, |
| 75 | .low_thresh = 192 * 1024, |
| 76 | .timeout = IPV6_FRAG_TIMEOUT, |
| 77 | .secret_interval = 10 * 60 * HZ, |
| 78 | }; |
| 79 | |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 80 | static struct inet_frags nf_frags; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 81 | |
| 82 | static __inline__ void __fq_unlink(struct nf_ct_frag6_queue *fq) |
| 83 | { |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 84 | hlist_del(&fq->q.list); |
| 85 | list_del(&fq->q.lru_list); |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 86 | nf_frags.nqueues--; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 87 | } |
| 88 | |
| 89 | static __inline__ void fq_unlink(struct nf_ct_frag6_queue *fq) |
| 90 | { |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 91 | write_lock(&nf_frags.lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 92 | __fq_unlink(fq); |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 93 | write_unlock(&nf_frags.lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 94 | } |
| 95 | |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 96 | static unsigned int ip6qhashfn(__be32 id, struct in6_addr *saddr, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 97 | struct in6_addr *daddr) |
| 98 | { |
| 99 | u32 a, b, c; |
| 100 | |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 101 | a = (__force u32)saddr->s6_addr32[0]; |
| 102 | b = (__force u32)saddr->s6_addr32[1]; |
| 103 | c = (__force u32)saddr->s6_addr32[2]; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 104 | |
| 105 | a += JHASH_GOLDEN_RATIO; |
| 106 | b += JHASH_GOLDEN_RATIO; |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 107 | c += nf_frags.rnd; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 108 | __jhash_mix(a, b, c); |
| 109 | |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 110 | a += (__force u32)saddr->s6_addr32[3]; |
| 111 | b += (__force u32)daddr->s6_addr32[0]; |
| 112 | c += (__force u32)daddr->s6_addr32[1]; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 113 | __jhash_mix(a, b, c); |
| 114 | |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 115 | a += (__force u32)daddr->s6_addr32[2]; |
| 116 | b += (__force u32)daddr->s6_addr32[3]; |
| 117 | c += (__force u32)id; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 118 | __jhash_mix(a, b, c); |
| 119 | |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 120 | return c & (INETFRAGS_HASHSZ - 1); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 121 | } |
| 122 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 123 | static void nf_ct_frag6_secret_rebuild(unsigned long dummy) |
| 124 | { |
| 125 | unsigned long now = jiffies; |
| 126 | int i; |
| 127 | |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 128 | write_lock(&nf_frags.lock); |
| 129 | get_random_bytes(&nf_frags.rnd, sizeof(u32)); |
| 130 | for (i = 0; i < INETFRAGS_HASHSZ; i++) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 131 | struct nf_ct_frag6_queue *q; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 132 | struct hlist_node *p, *n; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 133 | |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 134 | hlist_for_each_entry_safe(q, p, n, &nf_frags.hash[i], q.list) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 135 | unsigned int hval = ip6qhashfn(q->id, |
| 136 | &q->saddr, |
| 137 | &q->daddr); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 138 | if (hval != i) { |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 139 | hlist_del(&q->q.list); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 140 | /* Relink to new hash chain. */ |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 141 | hlist_add_head(&q->q.list, |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 142 | &nf_frags.hash[hval]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 143 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 144 | } |
| 145 | } |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 146 | write_unlock(&nf_frags.lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 147 | |
Pavel Emelyanov | 04128f2 | 2007-10-15 02:33:45 -0700 | [diff] [blame^] | 148 | mod_timer(&nf_frags.secret_timer, now + nf_frags_ctl.secret_interval); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 149 | } |
| 150 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 151 | /* Memory Tracking Functions. */ |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 152 | static inline void frag_kfree_skb(struct sk_buff *skb, unsigned int *work) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 153 | { |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 154 | if (work) |
| 155 | *work -= skb->truesize; |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 156 | atomic_sub(skb->truesize, &nf_frags.mem); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 157 | if (NFCT_FRAG6_CB(skb)->orig) |
| 158 | kfree_skb(NFCT_FRAG6_CB(skb)->orig); |
| 159 | |
| 160 | kfree_skb(skb); |
| 161 | } |
| 162 | |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 163 | static inline void frag_free_queue(struct nf_ct_frag6_queue *fq, |
| 164 | unsigned int *work) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 165 | { |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 166 | if (work) |
| 167 | *work -= sizeof(struct nf_ct_frag6_queue); |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 168 | atomic_sub(sizeof(struct nf_ct_frag6_queue), &nf_frags.mem); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 169 | kfree(fq); |
| 170 | } |
| 171 | |
| 172 | static inline struct nf_ct_frag6_queue *frag_alloc_queue(void) |
| 173 | { |
| 174 | struct nf_ct_frag6_queue *fq = kmalloc(sizeof(struct nf_ct_frag6_queue), GFP_ATOMIC); |
| 175 | |
| 176 | if (!fq) |
| 177 | return NULL; |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 178 | atomic_add(sizeof(struct nf_ct_frag6_queue), &nf_frags.mem); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 179 | return fq; |
| 180 | } |
| 181 | |
| 182 | /* Destruction primitives. */ |
| 183 | |
| 184 | /* Complete destruction of fq. */ |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 185 | static void nf_ct_frag6_destroy(struct nf_ct_frag6_queue *fq, |
| 186 | unsigned int *work) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 187 | { |
| 188 | struct sk_buff *fp; |
| 189 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 190 | BUG_TRAP(fq->q.last_in&COMPLETE); |
| 191 | BUG_TRAP(del_timer(&fq->q.timer) == 0); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 192 | |
| 193 | /* Release all fragment data. */ |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 194 | fp = fq->q.fragments; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 195 | while (fp) { |
| 196 | struct sk_buff *xp = fp->next; |
| 197 | |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 198 | frag_kfree_skb(fp, work); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 199 | fp = xp; |
| 200 | } |
| 201 | |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 202 | frag_free_queue(fq, work); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 203 | } |
| 204 | |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 205 | static __inline__ void fq_put(struct nf_ct_frag6_queue *fq, unsigned int *work) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 206 | { |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 207 | if (atomic_dec_and_test(&fq->q.refcnt)) |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 208 | nf_ct_frag6_destroy(fq, work); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 209 | } |
| 210 | |
| 211 | /* Kill fq entry. It is not destroyed immediately, |
| 212 | * because caller (and someone more) holds reference count. |
| 213 | */ |
| 214 | static __inline__ void fq_kill(struct nf_ct_frag6_queue *fq) |
| 215 | { |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 216 | if (del_timer(&fq->q.timer)) |
| 217 | atomic_dec(&fq->q.refcnt); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 218 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 219 | if (!(fq->q.last_in & COMPLETE)) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 220 | fq_unlink(fq); |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 221 | atomic_dec(&fq->q.refcnt); |
| 222 | fq->q.last_in |= COMPLETE; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 223 | } |
| 224 | } |
| 225 | |
| 226 | static void nf_ct_frag6_evictor(void) |
| 227 | { |
| 228 | struct nf_ct_frag6_queue *fq; |
| 229 | struct list_head *tmp; |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 230 | unsigned int work; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 231 | |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 232 | work = atomic_read(&nf_frags.mem); |
Pavel Emelyanov | 04128f2 | 2007-10-15 02:33:45 -0700 | [diff] [blame^] | 233 | if (work <= nf_frags_ctl.low_thresh) |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 234 | return; |
| 235 | |
Pavel Emelyanov | 04128f2 | 2007-10-15 02:33:45 -0700 | [diff] [blame^] | 236 | work -= nf_frags_ctl.low_thresh; |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 237 | while (work > 0) { |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 238 | read_lock(&nf_frags.lock); |
| 239 | if (list_empty(&nf_frags.lru_list)) { |
| 240 | read_unlock(&nf_frags.lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 241 | return; |
| 242 | } |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 243 | tmp = nf_frags.lru_list.next; |
Yasuyuki Kozakai | 302fe17 | 2005-11-14 15:28:45 -0800 | [diff] [blame] | 244 | BUG_ON(tmp == NULL); |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 245 | fq = list_entry(tmp, struct nf_ct_frag6_queue, q.lru_list); |
| 246 | atomic_inc(&fq->q.refcnt); |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 247 | read_unlock(&nf_frags.lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 248 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 249 | spin_lock(&fq->q.lock); |
| 250 | if (!(fq->q.last_in&COMPLETE)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 251 | fq_kill(fq); |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 252 | spin_unlock(&fq->q.lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 253 | |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 254 | fq_put(fq, &work); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 255 | } |
| 256 | } |
| 257 | |
| 258 | static void nf_ct_frag6_expire(unsigned long data) |
| 259 | { |
| 260 | struct nf_ct_frag6_queue *fq = (struct nf_ct_frag6_queue *) data; |
| 261 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 262 | spin_lock(&fq->q.lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 263 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 264 | if (fq->q.last_in & COMPLETE) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 265 | goto out; |
| 266 | |
| 267 | fq_kill(fq); |
| 268 | |
| 269 | out: |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 270 | spin_unlock(&fq->q.lock); |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 271 | fq_put(fq, NULL); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 272 | } |
| 273 | |
| 274 | /* Creation primitives. */ |
| 275 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 276 | static struct nf_ct_frag6_queue *nf_ct_frag6_intern(unsigned int hash, |
| 277 | struct nf_ct_frag6_queue *fq_in) |
| 278 | { |
| 279 | struct nf_ct_frag6_queue *fq; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 280 | #ifdef CONFIG_SMP |
| 281 | struct hlist_node *n; |
| 282 | #endif |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 283 | |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 284 | write_lock(&nf_frags.lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 285 | #ifdef CONFIG_SMP |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 286 | hlist_for_each_entry(fq, n, &nf_frags.hash[hash], q.list) { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 287 | if (fq->id == fq_in->id && |
Yasuyuki Kozakai | 6ea46c9 | 2006-03-20 17:58:44 -0800 | [diff] [blame] | 288 | ipv6_addr_equal(&fq_in->saddr, &fq->saddr) && |
| 289 | ipv6_addr_equal(&fq_in->daddr, &fq->daddr)) { |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 290 | atomic_inc(&fq->q.refcnt); |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 291 | write_unlock(&nf_frags.lock); |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 292 | fq_in->q.last_in |= COMPLETE; |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 293 | fq_put(fq_in, NULL); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 294 | return fq; |
| 295 | } |
| 296 | } |
| 297 | #endif |
| 298 | fq = fq_in; |
| 299 | |
Pavel Emelyanov | 04128f2 | 2007-10-15 02:33:45 -0700 | [diff] [blame^] | 300 | if (!mod_timer(&fq->q.timer, jiffies + nf_frags_ctl.timeout)) |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 301 | atomic_inc(&fq->q.refcnt); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 302 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 303 | atomic_inc(&fq->q.refcnt); |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 304 | hlist_add_head(&fq->q.list, &nf_frags.hash[hash]); |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 305 | INIT_LIST_HEAD(&fq->q.lru_list); |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 306 | list_add_tail(&fq->q.lru_list, &nf_frags.lru_list); |
| 307 | nf_frags.nqueues++; |
| 308 | write_unlock(&nf_frags.lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 309 | return fq; |
| 310 | } |
| 311 | |
| 312 | |
| 313 | static struct nf_ct_frag6_queue * |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 314 | nf_ct_frag6_create(unsigned int hash, __be32 id, struct in6_addr *src, struct in6_addr *dst) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 315 | { |
| 316 | struct nf_ct_frag6_queue *fq; |
| 317 | |
| 318 | if ((fq = frag_alloc_queue()) == NULL) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 319 | pr_debug("Can't alloc new queue\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 320 | goto oom; |
| 321 | } |
| 322 | |
| 323 | memset(fq, 0, sizeof(struct nf_ct_frag6_queue)); |
| 324 | |
| 325 | fq->id = id; |
| 326 | ipv6_addr_copy(&fq->saddr, src); |
| 327 | ipv6_addr_copy(&fq->daddr, dst); |
| 328 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 329 | setup_timer(&fq->q.timer, nf_ct_frag6_expire, (unsigned long)fq); |
| 330 | spin_lock_init(&fq->q.lock); |
| 331 | atomic_set(&fq->q.refcnt, 1); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 332 | |
| 333 | return nf_ct_frag6_intern(hash, fq); |
| 334 | |
| 335 | oom: |
| 336 | return NULL; |
| 337 | } |
| 338 | |
| 339 | static __inline__ struct nf_ct_frag6_queue * |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 340 | fq_find(__be32 id, struct in6_addr *src, struct in6_addr *dst) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 341 | { |
| 342 | struct nf_ct_frag6_queue *fq; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 343 | struct hlist_node *n; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 344 | unsigned int hash = ip6qhashfn(id, src, dst); |
| 345 | |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 346 | read_lock(&nf_frags.lock); |
| 347 | hlist_for_each_entry(fq, n, &nf_frags.hash[hash], q.list) { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 348 | if (fq->id == id && |
Yasuyuki Kozakai | 6ea46c9 | 2006-03-20 17:58:44 -0800 | [diff] [blame] | 349 | ipv6_addr_equal(src, &fq->saddr) && |
| 350 | ipv6_addr_equal(dst, &fq->daddr)) { |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 351 | atomic_inc(&fq->q.refcnt); |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 352 | read_unlock(&nf_frags.lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 353 | return fq; |
| 354 | } |
| 355 | } |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 356 | read_unlock(&nf_frags.lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 357 | |
| 358 | return nf_ct_frag6_create(hash, id, src, dst); |
| 359 | } |
| 360 | |
| 361 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 362 | static int nf_ct_frag6_queue(struct nf_ct_frag6_queue *fq, struct sk_buff *skb, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 363 | struct frag_hdr *fhdr, int nhoff) |
| 364 | { |
| 365 | struct sk_buff *prev, *next; |
| 366 | int offset, end; |
| 367 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 368 | if (fq->q.last_in & COMPLETE) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 369 | pr_debug("Allready completed\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 370 | goto err; |
| 371 | } |
| 372 | |
| 373 | offset = ntohs(fhdr->frag_off) & ~0x7; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 374 | end = offset + (ntohs(ipv6_hdr(skb)->payload_len) - |
| 375 | ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1))); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 376 | |
| 377 | if ((unsigned int)end > IPV6_MAXPLEN) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 378 | pr_debug("offset is too large.\n"); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 379 | return -1; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 380 | } |
| 381 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 382 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
| 383 | const unsigned char *nh = skb_network_header(skb); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 384 | skb->csum = csum_sub(skb->csum, |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 385 | csum_partial(nh, (u8 *)(fhdr + 1) - nh, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 386 | 0)); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 387 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 388 | |
| 389 | /* Is this the final fragment? */ |
| 390 | if (!(fhdr->frag_off & htons(IP6_MF))) { |
| 391 | /* If we already have some bits beyond end |
| 392 | * or have different end, the segment is corrupted. |
| 393 | */ |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 394 | if (end < fq->q.len || |
| 395 | ((fq->q.last_in & LAST_IN) && end != fq->q.len)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 396 | pr_debug("already received last fragment\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 397 | goto err; |
| 398 | } |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 399 | fq->q.last_in |= LAST_IN; |
| 400 | fq->q.len = end; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 401 | } else { |
| 402 | /* Check if the fragment is rounded to 8 bytes. |
| 403 | * Required by the RFC. |
| 404 | */ |
| 405 | if (end & 0x7) { |
| 406 | /* RFC2460 says always send parameter problem in |
| 407 | * this case. -DaveM |
| 408 | */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 409 | pr_debug("end of fragment not rounded to 8 bytes.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 410 | return -1; |
| 411 | } |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 412 | if (end > fq->q.len) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 413 | /* Some bits beyond end -> corruption. */ |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 414 | if (fq->q.last_in & LAST_IN) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 415 | pr_debug("last packet already reached.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 416 | goto err; |
| 417 | } |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 418 | fq->q.len = end; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 419 | } |
| 420 | } |
| 421 | |
| 422 | if (end == offset) |
| 423 | goto err; |
| 424 | |
| 425 | /* Point into the IP datagram 'data' part. */ |
| 426 | if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 427 | pr_debug("queue: message is too short.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 428 | goto err; |
| 429 | } |
Herbert Xu | b38dfee | 2006-06-09 16:13:01 -0700 | [diff] [blame] | 430 | if (pskb_trim_rcsum(skb, end - offset)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 431 | pr_debug("Can't trim\n"); |
Herbert Xu | b38dfee | 2006-06-09 16:13:01 -0700 | [diff] [blame] | 432 | goto err; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 433 | } |
| 434 | |
| 435 | /* Find out which fragments are in front and at the back of us |
| 436 | * in the chain of fragments so far. We must know where to put |
| 437 | * this fragment, right? |
| 438 | */ |
| 439 | prev = NULL; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 440 | for (next = fq->q.fragments; next != NULL; next = next->next) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 441 | if (NFCT_FRAG6_CB(next)->offset >= offset) |
| 442 | break; /* bingo! */ |
| 443 | prev = next; |
| 444 | } |
| 445 | |
| 446 | /* We found where to put this one. Check for overlap with |
| 447 | * preceding fragment, and, if needed, align things so that |
| 448 | * any overlaps are eliminated. |
| 449 | */ |
| 450 | if (prev) { |
| 451 | int i = (NFCT_FRAG6_CB(prev)->offset + prev->len) - offset; |
| 452 | |
| 453 | if (i > 0) { |
| 454 | offset += i; |
| 455 | if (end <= offset) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 456 | pr_debug("overlap\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 457 | goto err; |
| 458 | } |
| 459 | if (!pskb_pull(skb, i)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 460 | pr_debug("Can't pull\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 461 | goto err; |
| 462 | } |
| 463 | if (skb->ip_summed != CHECKSUM_UNNECESSARY) |
| 464 | skb->ip_summed = CHECKSUM_NONE; |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | /* Look for overlap with succeeding segments. |
| 469 | * If we can merge fragments, do it. |
| 470 | */ |
| 471 | while (next && NFCT_FRAG6_CB(next)->offset < end) { |
| 472 | /* overlap is 'i' bytes */ |
| 473 | int i = end - NFCT_FRAG6_CB(next)->offset; |
| 474 | |
| 475 | if (i < next->len) { |
| 476 | /* Eat head of the next overlapped fragment |
| 477 | * and leave the loop. The next ones cannot overlap. |
| 478 | */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 479 | pr_debug("Eat head of the overlapped parts.: %d", i); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 480 | if (!pskb_pull(next, i)) |
| 481 | goto err; |
| 482 | |
| 483 | /* next fragment */ |
| 484 | NFCT_FRAG6_CB(next)->offset += i; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 485 | fq->q.meat -= i; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 486 | if (next->ip_summed != CHECKSUM_UNNECESSARY) |
| 487 | next->ip_summed = CHECKSUM_NONE; |
| 488 | break; |
| 489 | } else { |
| 490 | struct sk_buff *free_it = next; |
| 491 | |
| 492 | /* Old fragmnet is completely overridden with |
| 493 | * new one drop it. |
| 494 | */ |
| 495 | next = next->next; |
| 496 | |
| 497 | if (prev) |
| 498 | prev->next = next; |
| 499 | else |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 500 | fq->q.fragments = next; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 501 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 502 | fq->q.meat -= free_it->len; |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 503 | frag_kfree_skb(free_it, NULL); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 504 | } |
| 505 | } |
| 506 | |
| 507 | NFCT_FRAG6_CB(skb)->offset = offset; |
| 508 | |
| 509 | /* Insert this fragment in the chain of fragments. */ |
| 510 | skb->next = next; |
| 511 | if (prev) |
| 512 | prev->next = skb; |
| 513 | else |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 514 | fq->q.fragments = skb; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 515 | |
| 516 | skb->dev = NULL; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 517 | fq->q.stamp = skb->tstamp; |
| 518 | fq->q.meat += skb->len; |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 519 | atomic_add(skb->truesize, &nf_frags.mem); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 520 | |
| 521 | /* The first fragment. |
| 522 | * nhoffset is obtained from the first fragment, of course. |
| 523 | */ |
| 524 | if (offset == 0) { |
| 525 | fq->nhoffset = nhoff; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 526 | fq->q.last_in |= FIRST_IN; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 527 | } |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 528 | write_lock(&nf_frags.lock); |
| 529 | list_move_tail(&fq->q.lru_list, &nf_frags.lru_list); |
| 530 | write_unlock(&nf_frags.lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 531 | return 0; |
| 532 | |
| 533 | err: |
| 534 | return -1; |
| 535 | } |
| 536 | |
| 537 | /* |
| 538 | * Check if this packet is complete. |
| 539 | * Returns NULL on failure by any reason, and pointer |
| 540 | * to current nexthdr field in reassembled frame. |
| 541 | * |
| 542 | * It is called with locked fq, and caller must check that |
| 543 | * queue is eligible for reassembly i.e. it is not COMPLETE, |
| 544 | * the last and the first frames arrived and all the bits are here. |
| 545 | */ |
| 546 | static struct sk_buff * |
| 547 | nf_ct_frag6_reasm(struct nf_ct_frag6_queue *fq, struct net_device *dev) |
| 548 | { |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 549 | struct sk_buff *fp, *op, *head = fq->q.fragments; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 550 | int payload_len; |
| 551 | |
| 552 | fq_kill(fq); |
| 553 | |
| 554 | BUG_TRAP(head != NULL); |
| 555 | BUG_TRAP(NFCT_FRAG6_CB(head)->offset == 0); |
| 556 | |
| 557 | /* Unfragmented part is taken from the first segment. */ |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 558 | payload_len = ((head->data - skb_network_header(head)) - |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 559 | sizeof(struct ipv6hdr) + fq->q.len - |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 560 | sizeof(struct frag_hdr)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 561 | if (payload_len > IPV6_MAXPLEN) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 562 | pr_debug("payload len is too large.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 563 | goto out_oversize; |
| 564 | } |
| 565 | |
| 566 | /* Head of list must not be cloned. */ |
| 567 | if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 568 | pr_debug("skb is cloned but can't expand head"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 569 | goto out_oom; |
| 570 | } |
| 571 | |
| 572 | /* If the first fragment is fragmented itself, we split |
| 573 | * it to two chunks: the first with data and paged part |
| 574 | * and the second, holding only fragments. */ |
| 575 | if (skb_shinfo(head)->frag_list) { |
| 576 | struct sk_buff *clone; |
| 577 | int i, plen = 0; |
| 578 | |
| 579 | if ((clone = alloc_skb(0, GFP_ATOMIC)) == NULL) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 580 | pr_debug("Can't alloc skb\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 581 | goto out_oom; |
| 582 | } |
| 583 | clone->next = head->next; |
| 584 | head->next = clone; |
| 585 | skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list; |
| 586 | skb_shinfo(head)->frag_list = NULL; |
| 587 | for (i=0; i<skb_shinfo(head)->nr_frags; i++) |
| 588 | plen += skb_shinfo(head)->frags[i].size; |
| 589 | clone->len = clone->data_len = head->data_len - plen; |
| 590 | head->data_len -= clone->len; |
| 591 | head->len -= clone->len; |
| 592 | clone->csum = 0; |
| 593 | clone->ip_summed = head->ip_summed; |
| 594 | |
| 595 | NFCT_FRAG6_CB(clone)->orig = NULL; |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 596 | atomic_add(clone->truesize, &nf_frags.mem); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 597 | } |
| 598 | |
| 599 | /* We have to remove fragment header from datagram and to relocate |
| 600 | * header in order to calculate ICV correctly. */ |
Arnaldo Carvalho de Melo | bff9b61 | 2007-03-16 17:19:57 -0300 | [diff] [blame] | 601 | skb_network_header(head)[fq->nhoffset] = skb_transport_header(head)[0]; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 602 | memmove(head->head + sizeof(struct frag_hdr), head->head, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 603 | (head->data - head->head) - sizeof(struct frag_hdr)); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 604 | head->mac_header += sizeof(struct frag_hdr); |
| 605 | head->network_header += sizeof(struct frag_hdr); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 606 | |
| 607 | skb_shinfo(head)->frag_list = head->next; |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 608 | skb_reset_transport_header(head); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 609 | skb_push(head, head->data - skb_network_header(head)); |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 610 | atomic_sub(head->truesize, &nf_frags.mem); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 611 | |
| 612 | for (fp=head->next; fp; fp = fp->next) { |
| 613 | head->data_len += fp->len; |
| 614 | head->len += fp->len; |
| 615 | if (head->ip_summed != fp->ip_summed) |
| 616 | head->ip_summed = CHECKSUM_NONE; |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 617 | else if (head->ip_summed == CHECKSUM_COMPLETE) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 618 | head->csum = csum_add(head->csum, fp->csum); |
| 619 | head->truesize += fp->truesize; |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 620 | atomic_sub(fp->truesize, &nf_frags.mem); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 621 | } |
| 622 | |
| 623 | head->next = NULL; |
| 624 | head->dev = dev; |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 625 | head->tstamp = fq->q.stamp; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 626 | ipv6_hdr(head)->payload_len = htons(payload_len); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 627 | |
| 628 | /* Yes, and fold redundant checksum back. 8) */ |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 629 | if (head->ip_summed == CHECKSUM_COMPLETE) |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 630 | head->csum = csum_partial(skb_network_header(head), |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 631 | skb_network_header_len(head), |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 632 | head->csum); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 633 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 634 | fq->q.fragments = NULL; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 635 | |
| 636 | /* all original skbs are linked into the NFCT_FRAG6_CB(head).orig */ |
| 637 | fp = skb_shinfo(head)->frag_list; |
| 638 | if (NFCT_FRAG6_CB(fp)->orig == NULL) |
| 639 | /* at above code, head skb is divided into two skbs. */ |
| 640 | fp = fp->next; |
| 641 | |
| 642 | op = NFCT_FRAG6_CB(head)->orig; |
| 643 | for (; fp; fp = fp->next) { |
| 644 | struct sk_buff *orig = NFCT_FRAG6_CB(fp)->orig; |
| 645 | |
| 646 | op->next = orig; |
| 647 | op = orig; |
| 648 | NFCT_FRAG6_CB(fp)->orig = NULL; |
| 649 | } |
| 650 | |
| 651 | return head; |
| 652 | |
| 653 | out_oversize: |
| 654 | if (net_ratelimit()) |
| 655 | printk(KERN_DEBUG "nf_ct_frag6_reasm: payload len = %d\n", payload_len); |
| 656 | goto out_fail; |
| 657 | out_oom: |
| 658 | if (net_ratelimit()) |
| 659 | printk(KERN_DEBUG "nf_ct_frag6_reasm: no memory for reassembly\n"); |
| 660 | out_fail: |
| 661 | return NULL; |
| 662 | } |
| 663 | |
| 664 | /* |
| 665 | * find the header just before Fragment Header. |
| 666 | * |
| 667 | * if success return 0 and set ... |
| 668 | * (*prevhdrp): the value of "Next Header Field" in the header |
| 669 | * just before Fragment Header. |
| 670 | * (*prevhoff): the offset of "Next Header Field" in the header |
| 671 | * just before Fragment Header. |
| 672 | * (*fhoff) : the offset of Fragment Header. |
| 673 | * |
| 674 | * Based on ipv6_skip_hdr() in net/ipv6/exthdr.c |
| 675 | * |
| 676 | */ |
| 677 | static int |
| 678 | find_prev_fhdr(struct sk_buff *skb, u8 *prevhdrp, int *prevhoff, int *fhoff) |
| 679 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 680 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
Arnaldo Carvalho de Melo | 6b88dd9 | 2007-03-19 22:29:03 -0300 | [diff] [blame] | 681 | const int netoff = skb_network_offset(skb); |
| 682 | u8 prev_nhoff = netoff + offsetof(struct ipv6hdr, nexthdr); |
| 683 | int start = netoff + sizeof(struct ipv6hdr); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 684 | int len = skb->len - start; |
| 685 | u8 prevhdr = NEXTHDR_IPV6; |
| 686 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 687 | while (nexthdr != NEXTHDR_FRAGMENT) { |
| 688 | struct ipv6_opt_hdr hdr; |
| 689 | int hdrlen; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 690 | |
| 691 | if (!ipv6_ext_hdr(nexthdr)) { |
| 692 | return -1; |
| 693 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 694 | if (len < (int)sizeof(struct ipv6_opt_hdr)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 695 | pr_debug("too short\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 696 | return -1; |
| 697 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 698 | if (nexthdr == NEXTHDR_NONE) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 699 | pr_debug("next header is none\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 700 | return -1; |
| 701 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 702 | if (skb_copy_bits(skb, start, &hdr, sizeof(hdr))) |
| 703 | BUG(); |
| 704 | if (nexthdr == NEXTHDR_AUTH) |
| 705 | hdrlen = (hdr.hdrlen+2)<<2; |
| 706 | else |
| 707 | hdrlen = ipv6_optlen(&hdr); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 708 | |
| 709 | prevhdr = nexthdr; |
| 710 | prev_nhoff = start; |
| 711 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 712 | nexthdr = hdr.nexthdr; |
| 713 | len -= hdrlen; |
| 714 | start += hdrlen; |
| 715 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 716 | |
| 717 | if (len < 0) |
| 718 | return -1; |
| 719 | |
| 720 | *prevhdrp = prevhdr; |
| 721 | *prevhoff = prev_nhoff; |
| 722 | *fhoff = start; |
| 723 | |
| 724 | return 0; |
| 725 | } |
| 726 | |
| 727 | struct sk_buff *nf_ct_frag6_gather(struct sk_buff *skb) |
| 728 | { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 729 | struct sk_buff *clone; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 730 | struct net_device *dev = skb->dev; |
| 731 | struct frag_hdr *fhdr; |
| 732 | struct nf_ct_frag6_queue *fq; |
| 733 | struct ipv6hdr *hdr; |
| 734 | int fhoff, nhoff; |
| 735 | u8 prevhdr; |
| 736 | struct sk_buff *ret_skb = NULL; |
| 737 | |
| 738 | /* Jumbo payload inhibits frag. header */ |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 739 | if (ipv6_hdr(skb)->payload_len == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 740 | pr_debug("payload len = 0\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 741 | return skb; |
| 742 | } |
| 743 | |
| 744 | if (find_prev_fhdr(skb, &prevhdr, &nhoff, &fhoff) < 0) |
| 745 | return skb; |
| 746 | |
| 747 | clone = skb_clone(skb, GFP_ATOMIC); |
| 748 | if (clone == NULL) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 749 | pr_debug("Can't clone skb\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 750 | return skb; |
| 751 | } |
| 752 | |
| 753 | NFCT_FRAG6_CB(clone)->orig = skb; |
| 754 | |
| 755 | if (!pskb_may_pull(clone, fhoff + sizeof(*fhdr))) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 756 | pr_debug("message is too short.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 757 | goto ret_orig; |
| 758 | } |
| 759 | |
Arnaldo Carvalho de Melo | 967b05f | 2007-03-13 13:51:52 -0300 | [diff] [blame] | 760 | skb_set_transport_header(clone, fhoff); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 761 | hdr = ipv6_hdr(clone); |
Arnaldo Carvalho de Melo | bff9b61 | 2007-03-16 17:19:57 -0300 | [diff] [blame] | 762 | fhdr = (struct frag_hdr *)skb_transport_header(clone); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 763 | |
| 764 | if (!(fhdr->frag_off & htons(0xFFF9))) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 765 | pr_debug("Invalid fragment offset\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 766 | /* It is not a fragmented frame */ |
| 767 | goto ret_orig; |
| 768 | } |
| 769 | |
Pavel Emelyanov | 04128f2 | 2007-10-15 02:33:45 -0700 | [diff] [blame^] | 770 | if (atomic_read(&nf_frags.mem) > nf_frags_ctl.high_thresh) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 771 | nf_ct_frag6_evictor(); |
| 772 | |
| 773 | fq = fq_find(fhdr->identification, &hdr->saddr, &hdr->daddr); |
| 774 | if (fq == NULL) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 775 | pr_debug("Can't find and can't create new queue\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 776 | goto ret_orig; |
| 777 | } |
| 778 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 779 | spin_lock(&fq->q.lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 780 | |
| 781 | if (nf_ct_frag6_queue(fq, clone, fhdr, nhoff) < 0) { |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 782 | spin_unlock(&fq->q.lock); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 783 | pr_debug("Can't insert skb to queue\n"); |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 784 | fq_put(fq, NULL); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 785 | goto ret_orig; |
| 786 | } |
| 787 | |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 788 | if (fq->q.last_in == (FIRST_IN|LAST_IN) && fq->q.meat == fq->q.len) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 789 | ret_skb = nf_ct_frag6_reasm(fq, dev); |
| 790 | if (ret_skb == NULL) |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 791 | pr_debug("Can't reassemble fragmented packets\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 792 | } |
Pavel Emelyanov | 5ab11c9 | 2007-10-15 02:24:19 -0700 | [diff] [blame] | 793 | spin_unlock(&fq->q.lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 794 | |
Yasuyuki Kozakai | 1ba430b | 2005-11-14 15:28:18 -0800 | [diff] [blame] | 795 | fq_put(fq, NULL); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 796 | return ret_skb; |
| 797 | |
| 798 | ret_orig: |
| 799 | kfree_skb(clone); |
| 800 | return skb; |
| 801 | } |
| 802 | |
| 803 | void nf_ct_frag6_output(unsigned int hooknum, struct sk_buff *skb, |
| 804 | struct net_device *in, struct net_device *out, |
| 805 | int (*okfn)(struct sk_buff *)) |
| 806 | { |
| 807 | struct sk_buff *s, *s2; |
| 808 | |
| 809 | for (s = NFCT_FRAG6_CB(skb)->orig; s;) { |
| 810 | nf_conntrack_put_reasm(s->nfct_reasm); |
| 811 | nf_conntrack_get_reasm(skb); |
| 812 | s->nfct_reasm = skb; |
| 813 | |
| 814 | s2 = s->next; |
Patrick McHardy | f9f02cc | 2007-01-09 14:32:41 -0800 | [diff] [blame] | 815 | s->next = NULL; |
| 816 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 817 | NF_HOOK_THRESH(PF_INET6, hooknum, s, in, out, okfn, |
| 818 | NF_IP6_PRI_CONNTRACK_DEFRAG + 1); |
| 819 | s = s2; |
| 820 | } |
| 821 | nf_conntrack_put_reasm(skb); |
| 822 | } |
| 823 | |
| 824 | int nf_ct_frag6_kfree_frags(struct sk_buff *skb) |
| 825 | { |
| 826 | struct sk_buff *s, *s2; |
| 827 | |
| 828 | for (s = NFCT_FRAG6_CB(skb)->orig; s; s = s2) { |
| 829 | |
| 830 | s2 = s->next; |
| 831 | kfree_skb(s); |
| 832 | } |
| 833 | |
| 834 | kfree_skb(skb); |
| 835 | |
| 836 | return 0; |
| 837 | } |
| 838 | |
| 839 | int nf_ct_frag6_init(void) |
| 840 | { |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 841 | setup_timer(&nf_frags.secret_timer, nf_ct_frag6_secret_rebuild, 0); |
Pavel Emelyanov | 04128f2 | 2007-10-15 02:33:45 -0700 | [diff] [blame^] | 842 | nf_frags.secret_timer.expires = jiffies + nf_frags_ctl.secret_interval; |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 843 | add_timer(&nf_frags.secret_timer); |
| 844 | |
Pavel Emelyanov | 04128f2 | 2007-10-15 02:33:45 -0700 | [diff] [blame^] | 845 | nf_frags.ctl = &nf_frags_ctl; |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 846 | inet_frags_init(&nf_frags); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 847 | |
| 848 | return 0; |
| 849 | } |
| 850 | |
| 851 | void nf_ct_frag6_cleanup(void) |
| 852 | { |
Pavel Emelyanov | 7eb9515 | 2007-10-15 02:31:52 -0700 | [diff] [blame] | 853 | inet_frags_fini(&nf_frags); |
| 854 | |
| 855 | del_timer(&nf_frags.secret_timer); |
Pavel Emelyanov | 04128f2 | 2007-10-15 02:33:45 -0700 | [diff] [blame^] | 856 | nf_frags_ctl.low_thresh = 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 857 | nf_ct_frag6_evictor(); |
| 858 | } |