Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1 | /* Connection state tracking for netfilter. This is separated from, |
| 2 | but required by, the NAT layer; it can also be used by an iptables |
| 3 | extension. */ |
| 4 | |
| 5 | /* (C) 1999-2001 Paul `Rusty' Russell |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 6 | * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 7 | * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org> |
Patrick McHardy | f229f6c | 2013-04-06 15:24:29 +0200 | [diff] [blame] | 8 | * (C) 2005-2012 Patrick McHardy <kaber@trash.net> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 13 | */ |
| 14 | |
Weongyo Jeong | ccd63c2 | 2016-03-15 10:57:44 -0700 | [diff] [blame] | 15 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 16 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 17 | #include <linux/types.h> |
| 18 | #include <linux/netfilter.h> |
| 19 | #include <linux/module.h> |
Alexey Dobriyan | d43c36d | 2009-10-07 17:09:06 +0400 | [diff] [blame] | 20 | #include <linux/sched.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 21 | #include <linux/skbuff.h> |
| 22 | #include <linux/proc_fs.h> |
| 23 | #include <linux/vmalloc.h> |
| 24 | #include <linux/stddef.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/random.h> |
| 27 | #include <linux/jhash.h> |
| 28 | #include <linux/err.h> |
| 29 | #include <linux/percpu.h> |
| 30 | #include <linux/moduleparam.h> |
| 31 | #include <linux/notifier.h> |
| 32 | #include <linux/kernel.h> |
| 33 | #include <linux/netdevice.h> |
| 34 | #include <linux/socket.h> |
Al Viro | d7fe0f2 | 2006-12-03 23:15:30 -0500 | [diff] [blame] | 35 | #include <linux/mm.h> |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 36 | #include <linux/nsproxy.h> |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 37 | #include <linux/rculist_nulls.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 38 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 39 | #include <net/netfilter/nf_conntrack.h> |
| 40 | #include <net/netfilter/nf_conntrack_l3proto.h> |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 41 | #include <net/netfilter/nf_conntrack_l4proto.h> |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 42 | #include <net/netfilter/nf_conntrack_expect.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 43 | #include <net/netfilter/nf_conntrack_helper.h> |
Patrick McHardy | 41d73ec | 2013-08-27 08:50:12 +0200 | [diff] [blame] | 44 | #include <net/netfilter/nf_conntrack_seqadj.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 45 | #include <net/netfilter/nf_conntrack_core.h> |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 46 | #include <net/netfilter/nf_conntrack_extend.h> |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 47 | #include <net/netfilter/nf_conntrack_acct.h> |
Pablo Neira Ayuso | a0891aa | 2009-06-13 12:26:29 +0200 | [diff] [blame] | 48 | #include <net/netfilter/nf_conntrack_ecache.h> |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 49 | #include <net/netfilter/nf_conntrack_zones.h> |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 50 | #include <net/netfilter/nf_conntrack_timestamp.h> |
Pablo Neira Ayuso | dd70507 | 2012-02-28 23:36:48 +0100 | [diff] [blame] | 51 | #include <net/netfilter/nf_conntrack_timeout.h> |
Florian Westphal | c539f01 | 2013-01-11 06:30:44 +0000 | [diff] [blame] | 52 | #include <net/netfilter/nf_conntrack_labels.h> |
Patrick McHardy | 48b1de4 | 2013-08-27 08:50:14 +0200 | [diff] [blame] | 53 | #include <net/netfilter/nf_conntrack_synproxy.h> |
Pablo Neira Ayuso | e6a7d3c | 2008-10-14 11:58:31 -0700 | [diff] [blame] | 54 | #include <net/netfilter/nf_nat.h> |
Patrick McHardy | e17b666 | 2008-11-18 12:24:17 +0100 | [diff] [blame] | 55 | #include <net/netfilter/nf_nat_core.h> |
stephen hemminger | 4937636 | 2013-03-16 07:00:28 +0000 | [diff] [blame] | 56 | #include <net/netfilter/nf_nat_helper.h> |
Florian Westphal | 1b8c8a9 | 2016-05-03 00:25:58 +0200 | [diff] [blame] | 57 | #include <net/netns/hash.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 58 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 59 | #define NF_CONNTRACK_VERSION "0.5.0" |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 60 | |
Patrick McHardy | e17b666 | 2008-11-18 12:24:17 +0100 | [diff] [blame] | 61 | int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct, |
| 62 | enum nf_nat_manip_type manip, |
Patrick McHardy | 3993832 | 2009-08-25 16:07:58 +0200 | [diff] [blame] | 63 | const struct nlattr *attr) __read_mostly; |
Pablo Neira Ayuso | e6a7d3c | 2008-10-14 11:58:31 -0700 | [diff] [blame] | 64 | EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook); |
| 65 | |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 66 | __cacheline_aligned_in_smp spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS]; |
| 67 | EXPORT_SYMBOL_GPL(nf_conntrack_locks); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 68 | |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 69 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(nf_conntrack_expect_lock); |
| 70 | EXPORT_SYMBOL_GPL(nf_conntrack_expect_lock); |
| 71 | |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 72 | struct hlist_nulls_head *nf_conntrack_hash __read_mostly; |
| 73 | EXPORT_SYMBOL_GPL(nf_conntrack_hash); |
| 74 | |
Florian Westphal | b87a2f9 | 2016-08-25 15:33:33 +0200 | [diff] [blame^] | 75 | struct conntrack_gc_work { |
| 76 | struct delayed_work dwork; |
| 77 | u32 last_bucket; |
| 78 | bool exiting; |
| 79 | }; |
| 80 | |
Florian Westphal | 0c5366b | 2016-05-09 16:24:32 +0200 | [diff] [blame] | 81 | static __read_mostly struct kmem_cache *nf_conntrack_cachep; |
Sasha Levin | b16c291 | 2016-01-18 19:23:51 -0500 | [diff] [blame] | 82 | static __read_mostly spinlock_t nf_conntrack_locks_all_lock; |
Florian Westphal | 70d72b7 | 2016-04-24 01:17:14 +0200 | [diff] [blame] | 83 | static __read_mostly DEFINE_SPINLOCK(nf_conntrack_locks_all_lock); |
Sasha Levin | b16c291 | 2016-01-18 19:23:51 -0500 | [diff] [blame] | 84 | static __read_mostly bool nf_conntrack_locks_all; |
| 85 | |
Florian Westphal | b87a2f9 | 2016-08-25 15:33:33 +0200 | [diff] [blame^] | 86 | #define GC_MAX_BUCKETS_DIV 64u |
| 87 | #define GC_MAX_BUCKETS 8192u |
| 88 | #define GC_INTERVAL (5 * HZ) |
| 89 | #define GC_MAX_EVICTS 256u |
| 90 | |
| 91 | static struct conntrack_gc_work conntrack_gc_work; |
| 92 | |
Sasha Levin | b16c291 | 2016-01-18 19:23:51 -0500 | [diff] [blame] | 93 | void nf_conntrack_lock(spinlock_t *lock) __acquires(lock) |
| 94 | { |
| 95 | spin_lock(lock); |
| 96 | while (unlikely(nf_conntrack_locks_all)) { |
| 97 | spin_unlock(lock); |
Peter Zijlstra | b316ff7 | 2016-05-24 15:00:38 +0200 | [diff] [blame] | 98 | |
| 99 | /* |
| 100 | * Order the 'nf_conntrack_locks_all' load vs. the |
| 101 | * spin_unlock_wait() loads below, to ensure |
| 102 | * that 'nf_conntrack_locks_all_lock' is indeed held: |
| 103 | */ |
| 104 | smp_rmb(); /* spin_lock(&nf_conntrack_locks_all_lock) */ |
Nicholas Mc Guire | e39365b | 2016-03-14 12:39:02 +0100 | [diff] [blame] | 105 | spin_unlock_wait(&nf_conntrack_locks_all_lock); |
Sasha Levin | b16c291 | 2016-01-18 19:23:51 -0500 | [diff] [blame] | 106 | spin_lock(lock); |
| 107 | } |
| 108 | } |
| 109 | EXPORT_SYMBOL_GPL(nf_conntrack_lock); |
| 110 | |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 111 | static void nf_conntrack_double_unlock(unsigned int h1, unsigned int h2) |
| 112 | { |
| 113 | h1 %= CONNTRACK_LOCKS; |
| 114 | h2 %= CONNTRACK_LOCKS; |
| 115 | spin_unlock(&nf_conntrack_locks[h1]); |
| 116 | if (h1 != h2) |
| 117 | spin_unlock(&nf_conntrack_locks[h2]); |
| 118 | } |
| 119 | |
| 120 | /* return true if we need to recompute hashes (in case hash table was resized) */ |
| 121 | static bool nf_conntrack_double_lock(struct net *net, unsigned int h1, |
| 122 | unsigned int h2, unsigned int sequence) |
| 123 | { |
| 124 | h1 %= CONNTRACK_LOCKS; |
| 125 | h2 %= CONNTRACK_LOCKS; |
| 126 | if (h1 <= h2) { |
Sasha Levin | b16c291 | 2016-01-18 19:23:51 -0500 | [diff] [blame] | 127 | nf_conntrack_lock(&nf_conntrack_locks[h1]); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 128 | if (h1 != h2) |
| 129 | spin_lock_nested(&nf_conntrack_locks[h2], |
| 130 | SINGLE_DEPTH_NESTING); |
| 131 | } else { |
Sasha Levin | b16c291 | 2016-01-18 19:23:51 -0500 | [diff] [blame] | 132 | nf_conntrack_lock(&nf_conntrack_locks[h2]); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 133 | spin_lock_nested(&nf_conntrack_locks[h1], |
| 134 | SINGLE_DEPTH_NESTING); |
| 135 | } |
Florian Westphal | a3efd81 | 2016-04-18 16:16:59 +0200 | [diff] [blame] | 136 | if (read_seqcount_retry(&nf_conntrack_generation, sequence)) { |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 137 | nf_conntrack_double_unlock(h1, h2); |
| 138 | return true; |
| 139 | } |
| 140 | return false; |
| 141 | } |
| 142 | |
| 143 | static void nf_conntrack_all_lock(void) |
| 144 | { |
| 145 | int i; |
| 146 | |
Sasha Levin | b16c291 | 2016-01-18 19:23:51 -0500 | [diff] [blame] | 147 | spin_lock(&nf_conntrack_locks_all_lock); |
| 148 | nf_conntrack_locks_all = true; |
| 149 | |
Peter Zijlstra | b316ff7 | 2016-05-24 15:00:38 +0200 | [diff] [blame] | 150 | /* |
| 151 | * Order the above store of 'nf_conntrack_locks_all' against |
| 152 | * the spin_unlock_wait() loads below, such that if |
| 153 | * nf_conntrack_lock() observes 'nf_conntrack_locks_all' |
| 154 | * we must observe nf_conntrack_locks[] held: |
| 155 | */ |
| 156 | smp_mb(); /* spin_lock(&nf_conntrack_locks_all_lock) */ |
| 157 | |
Sasha Levin | b16c291 | 2016-01-18 19:23:51 -0500 | [diff] [blame] | 158 | for (i = 0; i < CONNTRACK_LOCKS; i++) { |
Nicholas Mc Guire | e39365b | 2016-03-14 12:39:02 +0100 | [diff] [blame] | 159 | spin_unlock_wait(&nf_conntrack_locks[i]); |
Sasha Levin | b16c291 | 2016-01-18 19:23:51 -0500 | [diff] [blame] | 160 | } |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 161 | } |
| 162 | |
| 163 | static void nf_conntrack_all_unlock(void) |
| 164 | { |
Peter Zijlstra | b316ff7 | 2016-05-24 15:00:38 +0200 | [diff] [blame] | 165 | /* |
| 166 | * All prior stores must be complete before we clear |
| 167 | * 'nf_conntrack_locks_all'. Otherwise nf_conntrack_lock() |
| 168 | * might observe the false value but not the entire |
| 169 | * critical section: |
| 170 | */ |
| 171 | smp_store_release(&nf_conntrack_locks_all, false); |
Sasha Levin | b16c291 | 2016-01-18 19:23:51 -0500 | [diff] [blame] | 172 | spin_unlock(&nf_conntrack_locks_all_lock); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 173 | } |
| 174 | |
Martin Josefsson | e2b7606 | 2006-11-29 02:35:04 +0100 | [diff] [blame] | 175 | unsigned int nf_conntrack_htable_size __read_mostly; |
Pablo Neira Ayuso | 2567c4e | 2016-08-18 11:15:12 +0200 | [diff] [blame] | 176 | EXPORT_SYMBOL_GPL(nf_conntrack_htable_size); |
| 177 | |
Hagen Paul Pfeifer | e478075 | 2009-02-20 10:47:09 +0100 | [diff] [blame] | 178 | unsigned int nf_conntrack_max __read_mostly; |
Liping Zhang | 92e47ba | 2016-08-13 22:35:36 +0800 | [diff] [blame] | 179 | seqcount_t nf_conntrack_generation __read_mostly; |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 180 | |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 181 | DEFINE_PER_CPU(struct nf_conn, nf_conntrack_untracked); |
| 182 | EXPORT_PER_CPU_SYMBOL(nf_conntrack_untracked); |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 183 | |
Florian Westphal | 141658f | 2016-04-18 16:17:01 +0200 | [diff] [blame] | 184 | static unsigned int nf_conntrack_hash_rnd __read_mostly; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 185 | |
Florian Westphal | 1b8c8a9 | 2016-05-03 00:25:58 +0200 | [diff] [blame] | 186 | static u32 hash_conntrack_raw(const struct nf_conntrack_tuple *tuple, |
| 187 | const struct net *net) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 188 | { |
Patrick McHardy | 0794935 | 2008-01-31 04:40:52 -0800 | [diff] [blame] | 189 | unsigned int n; |
Florian Westphal | 1b8c8a9 | 2016-05-03 00:25:58 +0200 | [diff] [blame] | 190 | u32 seed; |
Sami Farin | 9b88790 | 2007-03-14 16:43:00 -0700 | [diff] [blame] | 191 | |
Florian Westphal | 141658f | 2016-04-18 16:17:01 +0200 | [diff] [blame] | 192 | get_random_once(&nf_conntrack_hash_rnd, sizeof(nf_conntrack_hash_rnd)); |
| 193 | |
Patrick McHardy | 0794935 | 2008-01-31 04:40:52 -0800 | [diff] [blame] | 194 | /* The direction must be ignored, so we hash everything up to the |
| 195 | * destination ports (which is a multiple of 4) and treat the last |
| 196 | * three bytes manually. |
| 197 | */ |
Florian Westphal | 1b8c8a9 | 2016-05-03 00:25:58 +0200 | [diff] [blame] | 198 | seed = nf_conntrack_hash_rnd ^ net_hash_mix(net); |
Patrick McHardy | 0794935 | 2008-01-31 04:40:52 -0800 | [diff] [blame] | 199 | n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32); |
Florian Westphal | 1b8c8a9 | 2016-05-03 00:25:58 +0200 | [diff] [blame] | 200 | return jhash2((u32 *)tuple, n, seed ^ |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 201 | (((__force __u16)tuple->dst.u.all << 16) | |
| 202 | tuple->dst.protonum)); |
| 203 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 204 | |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 205 | static u32 scale_hash(u32 hash) |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 206 | { |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 207 | return reciprocal_scale(hash, nf_conntrack_htable_size); |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 208 | } |
| 209 | |
Florian Westphal | 1b8c8a9 | 2016-05-03 00:25:58 +0200 | [diff] [blame] | 210 | static u32 __hash_conntrack(const struct net *net, |
| 211 | const struct nf_conntrack_tuple *tuple, |
| 212 | unsigned int size) |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 213 | { |
Florian Westphal | 1b8c8a9 | 2016-05-03 00:25:58 +0200 | [diff] [blame] | 214 | return reciprocal_scale(hash_conntrack_raw(tuple, net), size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 215 | } |
| 216 | |
Florian Westphal | 1b8c8a9 | 2016-05-03 00:25:58 +0200 | [diff] [blame] | 217 | static u32 hash_conntrack(const struct net *net, |
| 218 | const struct nf_conntrack_tuple *tuple) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 219 | { |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 220 | return scale_hash(hash_conntrack_raw(tuple, net)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 221 | } |
| 222 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 223 | bool |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 224 | nf_ct_get_tuple(const struct sk_buff *skb, |
| 225 | unsigned int nhoff, |
| 226 | unsigned int dataoff, |
| 227 | u_int16_t l3num, |
| 228 | u_int8_t protonum, |
Eric W. Biederman | a31f1ad | 2015-09-18 14:33:04 -0500 | [diff] [blame] | 229 | struct net *net, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 230 | struct nf_conntrack_tuple *tuple, |
| 231 | const struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 232 | const struct nf_conntrack_l4proto *l4proto) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 233 | { |
Philip Craig | 443a70d | 2008-04-29 03:35:10 -0700 | [diff] [blame] | 234 | memset(tuple, 0, sizeof(*tuple)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 235 | |
| 236 | tuple->src.l3num = l3num; |
| 237 | if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0) |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 238 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 239 | |
| 240 | tuple->dst.protonum = protonum; |
| 241 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; |
| 242 | |
Eric W. Biederman | a31f1ad | 2015-09-18 14:33:04 -0500 | [diff] [blame] | 243 | return l4proto->pkt_to_tuple(skb, dataoff, net, tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 244 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 245 | EXPORT_SYMBOL_GPL(nf_ct_get_tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 246 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 247 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
Eric W. Biederman | a31f1ad | 2015-09-18 14:33:04 -0500 | [diff] [blame] | 248 | u_int16_t l3num, |
| 249 | struct net *net, struct nf_conntrack_tuple *tuple) |
Yasuyuki Kozakai | e2a3123 | 2007-07-14 20:45:14 -0700 | [diff] [blame] | 250 | { |
| 251 | struct nf_conntrack_l3proto *l3proto; |
| 252 | struct nf_conntrack_l4proto *l4proto; |
| 253 | unsigned int protoff; |
| 254 | u_int8_t protonum; |
| 255 | int ret; |
| 256 | |
| 257 | rcu_read_lock(); |
| 258 | |
| 259 | l3proto = __nf_ct_l3proto_find(l3num); |
| 260 | ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum); |
| 261 | if (ret != NF_ACCEPT) { |
| 262 | rcu_read_unlock(); |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 263 | return false; |
Yasuyuki Kozakai | e2a3123 | 2007-07-14 20:45:14 -0700 | [diff] [blame] | 264 | } |
| 265 | |
| 266 | l4proto = __nf_ct_l4proto_find(l3num, protonum); |
| 267 | |
Eric W. Biederman | a31f1ad | 2015-09-18 14:33:04 -0500 | [diff] [blame] | 268 | ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, net, tuple, |
Yasuyuki Kozakai | e2a3123 | 2007-07-14 20:45:14 -0700 | [diff] [blame] | 269 | l3proto, l4proto); |
| 270 | |
| 271 | rcu_read_unlock(); |
| 272 | return ret; |
| 273 | } |
| 274 | EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); |
| 275 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 276 | bool |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 277 | nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, |
| 278 | const struct nf_conntrack_tuple *orig, |
| 279 | const struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 280 | const struct nf_conntrack_l4proto *l4proto) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 281 | { |
Philip Craig | 443a70d | 2008-04-29 03:35:10 -0700 | [diff] [blame] | 282 | memset(inverse, 0, sizeof(*inverse)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 283 | |
| 284 | inverse->src.l3num = orig->src.l3num; |
| 285 | if (l3proto->invert_tuple(inverse, orig) == 0) |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 286 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 287 | |
| 288 | inverse->dst.dir = !orig->dst.dir; |
| 289 | |
| 290 | inverse->dst.protonum = orig->dst.protonum; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 291 | return l4proto->invert_tuple(inverse, orig); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 292 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 293 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 294 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 295 | static void |
| 296 | clean_from_lists(struct nf_conn *ct) |
| 297 | { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 298 | pr_debug("clean_from_lists(%p)\n", ct); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 299 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
| 300 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 301 | |
| 302 | /* Destroy all pending expectations */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 303 | nf_ct_remove_expectations(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 304 | } |
| 305 | |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 306 | /* must be called with local_bh_disable */ |
| 307 | static void nf_ct_add_to_dying_list(struct nf_conn *ct) |
| 308 | { |
| 309 | struct ct_pcpu *pcpu; |
| 310 | |
| 311 | /* add this conntrack to the (per cpu) dying list */ |
| 312 | ct->cpu = smp_processor_id(); |
| 313 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); |
| 314 | |
| 315 | spin_lock(&pcpu->lock); |
| 316 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
| 317 | &pcpu->dying); |
| 318 | spin_unlock(&pcpu->lock); |
| 319 | } |
| 320 | |
| 321 | /* must be called with local_bh_disable */ |
| 322 | static void nf_ct_add_to_unconfirmed_list(struct nf_conn *ct) |
| 323 | { |
| 324 | struct ct_pcpu *pcpu; |
| 325 | |
| 326 | /* add this conntrack to the (per cpu) unconfirmed list */ |
| 327 | ct->cpu = smp_processor_id(); |
| 328 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); |
| 329 | |
| 330 | spin_lock(&pcpu->lock); |
| 331 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
| 332 | &pcpu->unconfirmed); |
| 333 | spin_unlock(&pcpu->lock); |
| 334 | } |
| 335 | |
| 336 | /* must be called with local_bh_disable */ |
| 337 | static void nf_ct_del_from_dying_or_unconfirmed_list(struct nf_conn *ct) |
| 338 | { |
| 339 | struct ct_pcpu *pcpu; |
| 340 | |
| 341 | /* We overload first tuple to link into unconfirmed or dying list.*/ |
| 342 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); |
| 343 | |
| 344 | spin_lock(&pcpu->lock); |
| 345 | BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode)); |
| 346 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
| 347 | spin_unlock(&pcpu->lock); |
| 348 | } |
| 349 | |
Pablo Neira Ayuso | 0838aa7 | 2015-07-13 15:11:48 +0200 | [diff] [blame] | 350 | /* Released via destroy_conntrack() */ |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 351 | struct nf_conn *nf_ct_tmpl_alloc(struct net *net, |
| 352 | const struct nf_conntrack_zone *zone, |
| 353 | gfp_t flags) |
Pablo Neira Ayuso | 0838aa7 | 2015-07-13 15:11:48 +0200 | [diff] [blame] | 354 | { |
| 355 | struct nf_conn *tmpl; |
| 356 | |
Joe Stringer | f58e5aa | 2015-08-04 18:34:00 -0700 | [diff] [blame] | 357 | tmpl = kzalloc(sizeof(*tmpl), flags); |
Pablo Neira Ayuso | 0838aa7 | 2015-07-13 15:11:48 +0200 | [diff] [blame] | 358 | if (tmpl == NULL) |
| 359 | return NULL; |
| 360 | |
| 361 | tmpl->status = IPS_TEMPLATE; |
| 362 | write_pnet(&tmpl->ct_net, net); |
Florian Westphal | 6c8dee9 | 2016-06-11 21:57:35 +0200 | [diff] [blame] | 363 | nf_ct_zone_add(tmpl, zone); |
Pablo Neira Ayuso | 0838aa7 | 2015-07-13 15:11:48 +0200 | [diff] [blame] | 364 | atomic_set(&tmpl->ct_general.use, 0); |
| 365 | |
| 366 | return tmpl; |
Pablo Neira Ayuso | 0838aa7 | 2015-07-13 15:11:48 +0200 | [diff] [blame] | 367 | } |
| 368 | EXPORT_SYMBOL_GPL(nf_ct_tmpl_alloc); |
| 369 | |
Daniel Borkmann | 9cf94ea | 2015-08-31 19:11:02 +0200 | [diff] [blame] | 370 | void nf_ct_tmpl_free(struct nf_conn *tmpl) |
Pablo Neira Ayuso | 0838aa7 | 2015-07-13 15:11:48 +0200 | [diff] [blame] | 371 | { |
| 372 | nf_ct_ext_destroy(tmpl); |
| 373 | nf_ct_ext_free(tmpl); |
| 374 | kfree(tmpl); |
| 375 | } |
Daniel Borkmann | 9cf94ea | 2015-08-31 19:11:02 +0200 | [diff] [blame] | 376 | EXPORT_SYMBOL_GPL(nf_ct_tmpl_free); |
Pablo Neira Ayuso | 0838aa7 | 2015-07-13 15:11:48 +0200 | [diff] [blame] | 377 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 378 | static void |
| 379 | destroy_conntrack(struct nf_conntrack *nfct) |
| 380 | { |
| 381 | struct nf_conn *ct = (struct nf_conn *)nfct; |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 382 | struct net *net = nf_ct_net(ct); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 383 | struct nf_conntrack_l4proto *l4proto; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 384 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 385 | pr_debug("destroy_conntrack(%p)\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 386 | NF_CT_ASSERT(atomic_read(&nfct->use) == 0); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 387 | |
Pablo Neira Ayuso | 0838aa7 | 2015-07-13 15:11:48 +0200 | [diff] [blame] | 388 | if (unlikely(nf_ct_is_template(ct))) { |
| 389 | nf_ct_tmpl_free(ct); |
| 390 | return; |
| 391 | } |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 392 | rcu_read_lock(); |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 393 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
Pablo Neira Ayuso | 4b4ceb9 | 2016-05-01 00:34:37 +0200 | [diff] [blame] | 394 | if (l4proto->destroy) |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 395 | l4proto->destroy(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 396 | |
Patrick McHardy | 982d9a9 | 2007-02-12 11:14:11 -0800 | [diff] [blame] | 397 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 398 | |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 399 | local_bh_disable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 400 | /* Expectations will have been removed in clean_from_lists, |
| 401 | * except TFTP can create an expectation on the first packet, |
| 402 | * before connection is in the list, so we need to clean here, |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 403 | * too. |
| 404 | */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 405 | nf_ct_remove_expectations(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 406 | |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 407 | nf_ct_del_from_dying_or_unconfirmed_list(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 408 | |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 409 | NF_CT_STAT_INC(net, delete); |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 410 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 411 | |
| 412 | if (ct->master) |
| 413 | nf_ct_put(ct->master); |
| 414 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 415 | pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 416 | nf_conntrack_free(ct); |
| 417 | } |
| 418 | |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 419 | static void nf_ct_delete_from_lists(struct nf_conn *ct) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 420 | { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 421 | struct net *net = nf_ct_net(ct); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 422 | unsigned int hash, reply_hash; |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 423 | unsigned int sequence; |
Patrick McHardy | 5397e97 | 2007-05-19 14:23:52 -0700 | [diff] [blame] | 424 | |
Pablo Neira Ayuso | 9858a3a | 2009-06-13 12:28:22 +0200 | [diff] [blame] | 425 | nf_ct_helper_destroy(ct); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 426 | |
| 427 | local_bh_disable(); |
| 428 | do { |
Florian Westphal | a3efd81 | 2016-04-18 16:16:59 +0200 | [diff] [blame] | 429 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
Daniel Borkmann | deedb59 | 2015-08-14 16:03:39 +0200 | [diff] [blame] | 430 | hash = hash_conntrack(net, |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 431 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
Daniel Borkmann | deedb59 | 2015-08-14 16:03:39 +0200 | [diff] [blame] | 432 | reply_hash = hash_conntrack(net, |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 433 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
| 434 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); |
| 435 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 436 | clean_from_lists(ct); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 437 | nf_conntrack_double_unlock(hash, reply_hash); |
| 438 | |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 439 | nf_ct_add_to_dying_list(ct); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 440 | |
| 441 | NF_CT_STAT_INC(net, delete_list); |
| 442 | local_bh_enable(); |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 443 | } |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 444 | |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 445 | bool nf_ct_delete(struct nf_conn *ct, u32 portid, int report) |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 446 | { |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 447 | struct nf_conn_tstamp *tstamp; |
| 448 | |
Florian Westphal | f330a7f | 2016-08-25 15:33:31 +0200 | [diff] [blame] | 449 | if (test_and_set_bit(IPS_DYING_BIT, &ct->status)) |
| 450 | return false; |
| 451 | |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 452 | tstamp = nf_conn_tstamp_find(ct); |
| 453 | if (tstamp && tstamp->stop == 0) |
Eric Dumazet | d2de875 | 2014-08-22 18:32:09 -0700 | [diff] [blame] | 454 | tstamp->stop = ktime_get_real_ns(); |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 455 | |
Florian Westphal | 9500507 | 2014-06-10 23:12:56 +0200 | [diff] [blame] | 456 | if (nf_conntrack_event_report(IPCT_DESTROY, ct, |
| 457 | portid, report) < 0) { |
Florian Westphal | f330a7f | 2016-08-25 15:33:31 +0200 | [diff] [blame] | 458 | /* destroy event was not delivered. nf_ct_put will |
| 459 | * be done by event cache worker on redelivery. |
| 460 | */ |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 461 | nf_ct_delete_from_lists(ct); |
Florian Westphal | 9500507 | 2014-06-10 23:12:56 +0200 | [diff] [blame] | 462 | nf_conntrack_ecache_delayed_work(nf_ct_net(ct)); |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 463 | return false; |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 464 | } |
Florian Westphal | 9500507 | 2014-06-10 23:12:56 +0200 | [diff] [blame] | 465 | |
| 466 | nf_conntrack_ecache_work(nf_ct_net(ct)); |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 467 | nf_ct_delete_from_lists(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 468 | nf_ct_put(ct); |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 469 | return true; |
| 470 | } |
| 471 | EXPORT_SYMBOL_GPL(nf_ct_delete); |
| 472 | |
Andrey Vagin | c6825c0 | 2014-01-29 19:34:14 +0100 | [diff] [blame] | 473 | static inline bool |
| 474 | nf_ct_key_equal(struct nf_conntrack_tuple_hash *h, |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 475 | const struct nf_conntrack_tuple *tuple, |
Florian Westphal | e0c7d47 | 2016-04-28 19:13:45 +0200 | [diff] [blame] | 476 | const struct nf_conntrack_zone *zone, |
| 477 | const struct net *net) |
Andrey Vagin | c6825c0 | 2014-01-29 19:34:14 +0100 | [diff] [blame] | 478 | { |
| 479 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); |
| 480 | |
| 481 | /* A conntrack can be recreated with the equal tuple, |
| 482 | * so we need to check that the conntrack is confirmed |
| 483 | */ |
| 484 | return nf_ct_tuple_equal(tuple, &h->tuple) && |
Daniel Borkmann | deedb59 | 2015-08-14 16:03:39 +0200 | [diff] [blame] | 485 | nf_ct_zone_equal(ct, zone, NF_CT_DIRECTION(h)) && |
Florian Westphal | e0c7d47 | 2016-04-28 19:13:45 +0200 | [diff] [blame] | 486 | nf_ct_is_confirmed(ct) && |
| 487 | net_eq(net, nf_ct_net(ct)); |
Andrey Vagin | c6825c0 | 2014-01-29 19:34:14 +0100 | [diff] [blame] | 488 | } |
| 489 | |
Florian Westphal | f330a7f | 2016-08-25 15:33:31 +0200 | [diff] [blame] | 490 | /* caller must hold rcu readlock and none of the nf_conntrack_locks */ |
| 491 | static void nf_ct_gc_expired(struct nf_conn *ct) |
| 492 | { |
| 493 | if (!atomic_inc_not_zero(&ct->ct_general.use)) |
| 494 | return; |
| 495 | |
| 496 | if (nf_ct_should_gc(ct)) |
| 497 | nf_ct_kill(ct); |
| 498 | |
| 499 | nf_ct_put(ct); |
| 500 | } |
| 501 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 502 | /* |
| 503 | * Warning : |
| 504 | * - Caller must take a reference on returned object |
| 505 | * and recheck nf_ct_tuple_equal(tuple, &h->tuple) |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 506 | */ |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 507 | static struct nf_conntrack_tuple_hash * |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 508 | ____nf_conntrack_find(struct net *net, const struct nf_conntrack_zone *zone, |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 509 | const struct nf_conntrack_tuple *tuple, u32 hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 510 | { |
| 511 | struct nf_conntrack_tuple_hash *h; |
Florian Westphal | 5e3c61f | 2016-04-28 19:13:41 +0200 | [diff] [blame] | 512 | struct hlist_nulls_head *ct_hash; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 513 | struct hlist_nulls_node *n; |
Liping Zhang | 92e47ba | 2016-08-13 22:35:36 +0800 | [diff] [blame] | 514 | unsigned int bucket, hsize; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 515 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 516 | begin: |
Liping Zhang | 92e47ba | 2016-08-13 22:35:36 +0800 | [diff] [blame] | 517 | nf_conntrack_get_ht(&ct_hash, &hsize); |
| 518 | bucket = reciprocal_scale(hash, hsize); |
Florian Westphal | 5e3c61f | 2016-04-28 19:13:41 +0200 | [diff] [blame] | 519 | |
| 520 | hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[bucket], hnnode) { |
Florian Westphal | f330a7f | 2016-08-25 15:33:31 +0200 | [diff] [blame] | 521 | struct nf_conn *ct; |
| 522 | |
| 523 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 524 | if (nf_ct_is_expired(ct)) { |
| 525 | nf_ct_gc_expired(ct); |
| 526 | continue; |
| 527 | } |
| 528 | |
| 529 | if (nf_ct_is_dying(ct)) |
| 530 | continue; |
| 531 | |
Florian Westphal | e0c7d47 | 2016-04-28 19:13:45 +0200 | [diff] [blame] | 532 | if (nf_ct_key_equal(h, tuple, zone, net)) { |
Florian Westphal | 2cf1234 | 2016-04-28 19:13:40 +0200 | [diff] [blame] | 533 | NF_CT_STAT_INC_ATOMIC(net, found); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 534 | return h; |
| 535 | } |
Florian Westphal | 2cf1234 | 2016-04-28 19:13:40 +0200 | [diff] [blame] | 536 | NF_CT_STAT_INC_ATOMIC(net, searched); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 537 | } |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 538 | /* |
| 539 | * if the nulls value we got at the end of this lookup is |
| 540 | * not the expected one, we must restart lookup. |
| 541 | * We probably met an item that was moved to another chain. |
| 542 | */ |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 543 | if (get_nulls_value(n) != bucket) { |
Florian Westphal | 2cf1234 | 2016-04-28 19:13:40 +0200 | [diff] [blame] | 544 | NF_CT_STAT_INC_ATOMIC(net, search_restart); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 545 | goto begin; |
Jesper Dangaard Brouer | af740b2 | 2010-04-23 12:34:56 +0200 | [diff] [blame] | 546 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 547 | |
| 548 | return NULL; |
| 549 | } |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 550 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 551 | /* Find a connection corresponding to a tuple. */ |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 552 | static struct nf_conntrack_tuple_hash * |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 553 | __nf_conntrack_find_get(struct net *net, const struct nf_conntrack_zone *zone, |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 554 | const struct nf_conntrack_tuple *tuple, u32 hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 555 | { |
| 556 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 557 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 558 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 559 | rcu_read_lock(); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 560 | begin: |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 561 | h = ____nf_conntrack_find(net, zone, tuple, hash); |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 562 | if (h) { |
| 563 | ct = nf_ct_tuplehash_to_ctrack(h); |
Patrick McHardy | 8d8890b7 | 2009-06-22 14:14:41 +0200 | [diff] [blame] | 564 | if (unlikely(nf_ct_is_dying(ct) || |
| 565 | !atomic_inc_not_zero(&ct->ct_general.use))) |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 566 | h = NULL; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 567 | else { |
Florian Westphal | e0c7d47 | 2016-04-28 19:13:45 +0200 | [diff] [blame] | 568 | if (unlikely(!nf_ct_key_equal(h, tuple, zone, net))) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 569 | nf_ct_put(ct); |
| 570 | goto begin; |
| 571 | } |
| 572 | } |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 573 | } |
| 574 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 575 | |
| 576 | return h; |
| 577 | } |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 578 | |
| 579 | struct nf_conntrack_tuple_hash * |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 580 | nf_conntrack_find_get(struct net *net, const struct nf_conntrack_zone *zone, |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 581 | const struct nf_conntrack_tuple *tuple) |
| 582 | { |
| 583 | return __nf_conntrack_find_get(net, zone, tuple, |
Florian Westphal | 1b8c8a9 | 2016-05-03 00:25:58 +0200 | [diff] [blame] | 584 | hash_conntrack_raw(tuple, net)); |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 585 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 586 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 587 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 588 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
| 589 | unsigned int hash, |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame] | 590 | unsigned int reply_hash) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 591 | { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 592 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 593 | &nf_conntrack_hash[hash]); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 594 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode, |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 595 | &nf_conntrack_hash[reply_hash]); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 596 | } |
| 597 | |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 598 | int |
| 599 | nf_conntrack_hash_check_insert(struct nf_conn *ct) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 600 | { |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 601 | const struct nf_conntrack_zone *zone; |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 602 | struct net *net = nf_ct_net(ct); |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame] | 603 | unsigned int hash, reply_hash; |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 604 | struct nf_conntrack_tuple_hash *h; |
| 605 | struct hlist_nulls_node *n; |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 606 | unsigned int sequence; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 607 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 608 | zone = nf_ct_zone(ct); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 609 | |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 610 | local_bh_disable(); |
| 611 | do { |
Florian Westphal | a3efd81 | 2016-04-18 16:16:59 +0200 | [diff] [blame] | 612 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
Daniel Borkmann | deedb59 | 2015-08-14 16:03:39 +0200 | [diff] [blame] | 613 | hash = hash_conntrack(net, |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 614 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
Daniel Borkmann | deedb59 | 2015-08-14 16:03:39 +0200 | [diff] [blame] | 615 | reply_hash = hash_conntrack(net, |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 616 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
| 617 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 618 | |
| 619 | /* See if there's one in the list already, including reverse */ |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 620 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[hash], hnnode) |
Florian Westphal | 8680434 | 2016-04-28 19:13:43 +0200 | [diff] [blame] | 621 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
Florian Westphal | e0c7d47 | 2016-04-28 19:13:45 +0200 | [diff] [blame] | 622 | zone, net)) |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 623 | goto out; |
Florian Westphal | 8680434 | 2016-04-28 19:13:43 +0200 | [diff] [blame] | 624 | |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 625 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[reply_hash], hnnode) |
Florian Westphal | 8680434 | 2016-04-28 19:13:43 +0200 | [diff] [blame] | 626 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
Florian Westphal | e0c7d47 | 2016-04-28 19:13:45 +0200 | [diff] [blame] | 627 | zone, net)) |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 628 | goto out; |
| 629 | |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 630 | smp_wmb(); |
| 631 | /* The caller holds a reference to this object */ |
| 632 | atomic_set(&ct->ct_general.use, 2); |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame] | 633 | __nf_conntrack_hash_insert(ct, hash, reply_hash); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 634 | nf_conntrack_double_unlock(hash, reply_hash); |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 635 | NF_CT_STAT_INC(net, insert); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 636 | local_bh_enable(); |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 637 | return 0; |
| 638 | |
| 639 | out: |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 640 | nf_conntrack_double_unlock(hash, reply_hash); |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 641 | NF_CT_STAT_INC(net, insert_failed); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 642 | local_bh_enable(); |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 643 | return -EEXIST; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 644 | } |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 645 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_check_insert); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 646 | |
Pablo Neira Ayuso | ba76738 | 2016-05-02 21:28:57 +0200 | [diff] [blame] | 647 | static inline void nf_ct_acct_update(struct nf_conn *ct, |
| 648 | enum ip_conntrack_info ctinfo, |
| 649 | unsigned int len) |
| 650 | { |
| 651 | struct nf_conn_acct *acct; |
| 652 | |
| 653 | acct = nf_conn_acct_find(ct); |
| 654 | if (acct) { |
| 655 | struct nf_conn_counter *counter = acct->counter; |
| 656 | |
| 657 | atomic64_inc(&counter[CTINFO2DIR(ctinfo)].packets); |
| 658 | atomic64_add(len, &counter[CTINFO2DIR(ctinfo)].bytes); |
| 659 | } |
| 660 | } |
| 661 | |
Pablo Neira Ayuso | 71d8c47 | 2016-05-01 00:28:40 +0200 | [diff] [blame] | 662 | static void nf_ct_acct_merge(struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
| 663 | const struct nf_conn *loser_ct) |
| 664 | { |
| 665 | struct nf_conn_acct *acct; |
| 666 | |
| 667 | acct = nf_conn_acct_find(loser_ct); |
| 668 | if (acct) { |
| 669 | struct nf_conn_counter *counter = acct->counter; |
Pablo Neira Ayuso | 71d8c47 | 2016-05-01 00:28:40 +0200 | [diff] [blame] | 670 | unsigned int bytes; |
| 671 | |
| 672 | /* u32 should be fine since we must have seen one packet. */ |
| 673 | bytes = atomic64_read(&counter[CTINFO2DIR(ctinfo)].bytes); |
| 674 | nf_ct_acct_update(ct, ctinfo, bytes); |
| 675 | } |
| 676 | } |
| 677 | |
| 678 | /* Resolve race on insertion if this protocol allows this. */ |
| 679 | static int nf_ct_resolve_clash(struct net *net, struct sk_buff *skb, |
| 680 | enum ip_conntrack_info ctinfo, |
| 681 | struct nf_conntrack_tuple_hash *h) |
| 682 | { |
| 683 | /* This is the conntrack entry already in hashes that won race. */ |
| 684 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); |
| 685 | struct nf_conntrack_l4proto *l4proto; |
| 686 | |
| 687 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
| 688 | if (l4proto->allow_clash && |
Pablo Neira Ayuso | 590b52e | 2016-07-11 17:28:54 +0200 | [diff] [blame] | 689 | !nfct_nat(ct) && |
Pablo Neira Ayuso | 71d8c47 | 2016-05-01 00:28:40 +0200 | [diff] [blame] | 690 | !nf_ct_is_dying(ct) && |
| 691 | atomic_inc_not_zero(&ct->ct_general.use)) { |
| 692 | nf_ct_acct_merge(ct, ctinfo, (struct nf_conn *)skb->nfct); |
| 693 | nf_conntrack_put(skb->nfct); |
| 694 | /* Assign conntrack already in hashes to this skbuff. Don't |
| 695 | * modify skb->nfctinfo to ensure consistent stateful filtering. |
| 696 | */ |
| 697 | skb->nfct = &ct->ct_general; |
| 698 | return NF_ACCEPT; |
| 699 | } |
| 700 | NF_CT_STAT_INC(net, drop); |
| 701 | return NF_DROP; |
| 702 | } |
| 703 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 704 | /* Confirm a connection given skb; places it in hash table */ |
| 705 | int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 706 | __nf_conntrack_confirm(struct sk_buff *skb) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 707 | { |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 708 | const struct nf_conntrack_zone *zone; |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame] | 709 | unsigned int hash, reply_hash; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 710 | struct nf_conntrack_tuple_hash *h; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 711 | struct nf_conn *ct; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 712 | struct nf_conn_help *help; |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 713 | struct nf_conn_tstamp *tstamp; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 714 | struct hlist_nulls_node *n; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 715 | enum ip_conntrack_info ctinfo; |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 716 | struct net *net; |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 717 | unsigned int sequence; |
Pablo Neira Ayuso | 71d8c47 | 2016-05-01 00:28:40 +0200 | [diff] [blame] | 718 | int ret = NF_DROP; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 719 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 720 | ct = nf_ct_get(skb, &ctinfo); |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 721 | net = nf_ct_net(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 722 | |
| 723 | /* ipt_REJECT uses nf_conntrack_attach to attach related |
| 724 | ICMP/TCP RST packets in other direction. Actual packet |
| 725 | which created connection will be IP_CT_NEW or for an |
| 726 | expected connection, IP_CT_RELATED. */ |
| 727 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) |
| 728 | return NF_ACCEPT; |
| 729 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 730 | zone = nf_ct_zone(ct); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 731 | local_bh_disable(); |
| 732 | |
| 733 | do { |
Florian Westphal | a3efd81 | 2016-04-18 16:16:59 +0200 | [diff] [blame] | 734 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 735 | /* reuse the hash saved before */ |
| 736 | hash = *(unsigned long *)&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev; |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 737 | hash = scale_hash(hash); |
Daniel Borkmann | deedb59 | 2015-08-14 16:03:39 +0200 | [diff] [blame] | 738 | reply_hash = hash_conntrack(net, |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 739 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
| 740 | |
| 741 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 742 | |
| 743 | /* We're not in hash table, and we refuse to set up related |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 744 | * connections for unconfirmed conns. But packet copies and |
| 745 | * REJECT will give spurious warnings here. |
| 746 | */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 747 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ |
| 748 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 749 | /* No external references means no one else could have |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 750 | * confirmed us. |
| 751 | */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 752 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 753 | pr_debug("Confirming conntrack %p\n", ct); |
Pablo Neira Ayuso | 8ca3f5e | 2014-11-25 00:14:47 +0100 | [diff] [blame] | 754 | /* We have to check the DYING flag after unlink to prevent |
| 755 | * a race against nf_ct_get_next_corpse() possibly called from |
| 756 | * user context, else we insert an already 'dead' hash, blocking |
| 757 | * further use of that particular connection -JM. |
| 758 | */ |
| 759 | nf_ct_del_from_dying_or_unconfirmed_list(ct); |
Joerg Marx | fc35077 | 2010-05-20 15:55:30 +0200 | [diff] [blame] | 760 | |
Pablo Neira Ayuso | 71d8c47 | 2016-05-01 00:28:40 +0200 | [diff] [blame] | 761 | if (unlikely(nf_ct_is_dying(ct))) { |
| 762 | nf_ct_add_to_dying_list(ct); |
| 763 | goto dying; |
| 764 | } |
Joerg Marx | fc35077 | 2010-05-20 15:55:30 +0200 | [diff] [blame] | 765 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 766 | /* See if there's one in the list already, including reverse: |
| 767 | NAT could have grabbed it without realizing, since we're |
| 768 | not in the hash. If there is, we lost race. */ |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 769 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[hash], hnnode) |
Florian Westphal | 8680434 | 2016-04-28 19:13:43 +0200 | [diff] [blame] | 770 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
Florian Westphal | e0c7d47 | 2016-04-28 19:13:45 +0200 | [diff] [blame] | 771 | zone, net)) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 772 | goto out; |
Florian Westphal | 8680434 | 2016-04-28 19:13:43 +0200 | [diff] [blame] | 773 | |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 774 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[reply_hash], hnnode) |
Florian Westphal | 8680434 | 2016-04-28 19:13:43 +0200 | [diff] [blame] | 775 | if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
Florian Westphal | e0c7d47 | 2016-04-28 19:13:45 +0200 | [diff] [blame] | 776 | zone, net)) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 777 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 778 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 779 | /* Timer relative to confirmation time, not original |
| 780 | setting time, otherwise we'd get timer wrap in |
| 781 | weird delay cases. */ |
Florian Westphal | f330a7f | 2016-08-25 15:33:31 +0200 | [diff] [blame] | 782 | ct->timeout += nfct_time_stamp; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 783 | atomic_inc(&ct->ct_general.use); |
Changli Gao | 45eec34 | 2011-01-18 15:08:13 +0100 | [diff] [blame] | 784 | ct->status |= IPS_CONFIRMED; |
Patrick McHardy | 5c8ec91 | 2009-06-22 14:14:16 +0200 | [diff] [blame] | 785 | |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 786 | /* set conntrack timestamp, if enabled. */ |
| 787 | tstamp = nf_conn_tstamp_find(ct); |
| 788 | if (tstamp) { |
| 789 | if (skb->tstamp.tv64 == 0) |
Joe Perches | e319269 | 2012-06-03 17:41:40 +0000 | [diff] [blame] | 790 | __net_timestamp(skb); |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 791 | |
| 792 | tstamp->start = ktime_to_ns(skb->tstamp); |
| 793 | } |
Patrick McHardy | 5c8ec91 | 2009-06-22 14:14:16 +0200 | [diff] [blame] | 794 | /* Since the lookup is lockless, hash insertion must be done after |
| 795 | * starting the timer and setting the CONFIRMED bit. The RCU barriers |
| 796 | * guarantee that no other CPU can find the conntrack before the above |
| 797 | * stores are visible. |
| 798 | */ |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame] | 799 | __nf_conntrack_hash_insert(ct, hash, reply_hash); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 800 | nf_conntrack_double_unlock(hash, reply_hash); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 801 | NF_CT_STAT_INC(net, insert); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 802 | local_bh_enable(); |
Patrick McHardy | 5c8ec91 | 2009-06-22 14:14:16 +0200 | [diff] [blame] | 803 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 804 | help = nfct_help(ct); |
| 805 | if (help && help->helper) |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 806 | nf_conntrack_event_cache(IPCT_HELPER, ct); |
Pablo Neira Ayuso | 17e6e4e | 2009-06-02 20:08:46 +0200 | [diff] [blame] | 807 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 808 | nf_conntrack_event_cache(master_ct(ct) ? |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 809 | IPCT_RELATED : IPCT_NEW, ct); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 810 | return NF_ACCEPT; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 811 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 812 | out: |
Pablo Neira Ayuso | 8ca3f5e | 2014-11-25 00:14:47 +0100 | [diff] [blame] | 813 | nf_ct_add_to_dying_list(ct); |
Pablo Neira Ayuso | 71d8c47 | 2016-05-01 00:28:40 +0200 | [diff] [blame] | 814 | ret = nf_ct_resolve_clash(net, skb, ctinfo, h); |
| 815 | dying: |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 816 | nf_conntrack_double_unlock(hash, reply_hash); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 817 | NF_CT_STAT_INC(net, insert_failed); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 818 | local_bh_enable(); |
Pablo Neira Ayuso | 71d8c47 | 2016-05-01 00:28:40 +0200 | [diff] [blame] | 819 | return ret; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 820 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 821 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 822 | |
| 823 | /* Returns true if a connection correspondings to the tuple (required |
| 824 | for NAT). */ |
| 825 | int |
| 826 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, |
| 827 | const struct nf_conn *ignored_conntrack) |
| 828 | { |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 829 | struct net *net = nf_ct_net(ignored_conntrack); |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 830 | const struct nf_conntrack_zone *zone; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 831 | struct nf_conntrack_tuple_hash *h; |
Florian Westphal | 5e3c61f | 2016-04-28 19:13:41 +0200 | [diff] [blame] | 832 | struct hlist_nulls_head *ct_hash; |
Liping Zhang | 92e47ba | 2016-08-13 22:35:36 +0800 | [diff] [blame] | 833 | unsigned int hash, hsize; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 834 | struct hlist_nulls_node *n; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 835 | struct nf_conn *ct; |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 836 | |
| 837 | zone = nf_ct_zone(ignored_conntrack); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 838 | |
Florian Westphal | 2cf1234 | 2016-04-28 19:13:40 +0200 | [diff] [blame] | 839 | rcu_read_lock(); |
Florian Westphal | 95a8d19 | 2016-08-25 15:33:29 +0200 | [diff] [blame] | 840 | begin: |
Liping Zhang | 92e47ba | 2016-08-13 22:35:36 +0800 | [diff] [blame] | 841 | nf_conntrack_get_ht(&ct_hash, &hsize); |
| 842 | hash = __hash_conntrack(net, tuple, hsize); |
Florian Westphal | 5e3c61f | 2016-04-28 19:13:41 +0200 | [diff] [blame] | 843 | |
| 844 | hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[hash], hnnode) { |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 845 | ct = nf_ct_tuplehash_to_ctrack(h); |
Florian Westphal | f330a7f | 2016-08-25 15:33:31 +0200 | [diff] [blame] | 846 | |
| 847 | if (ct == ignored_conntrack) |
| 848 | continue; |
| 849 | |
| 850 | if (nf_ct_is_expired(ct)) { |
| 851 | nf_ct_gc_expired(ct); |
| 852 | continue; |
| 853 | } |
| 854 | |
| 855 | if (nf_ct_key_equal(h, tuple, zone, net)) { |
Florian Westphal | 2cf1234 | 2016-04-28 19:13:40 +0200 | [diff] [blame] | 856 | NF_CT_STAT_INC_ATOMIC(net, found); |
| 857 | rcu_read_unlock(); |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 858 | return 1; |
| 859 | } |
Florian Westphal | 2cf1234 | 2016-04-28 19:13:40 +0200 | [diff] [blame] | 860 | NF_CT_STAT_INC_ATOMIC(net, searched); |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 861 | } |
Florian Westphal | 95a8d19 | 2016-08-25 15:33:29 +0200 | [diff] [blame] | 862 | |
| 863 | if (get_nulls_value(n) != hash) { |
| 864 | NF_CT_STAT_INC_ATOMIC(net, search_restart); |
| 865 | goto begin; |
| 866 | } |
| 867 | |
Florian Westphal | 2cf1234 | 2016-04-28 19:13:40 +0200 | [diff] [blame] | 868 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 869 | |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 870 | return 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 871 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 872 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 873 | |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 874 | #define NF_CT_EVICTION_RANGE 8 |
| 875 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 876 | /* There's a small race here where we may free a just-assured |
| 877 | connection. Too bad: we're in trouble anyway. */ |
Florian Westphal | 242922a | 2016-07-03 20:44:01 +0200 | [diff] [blame] | 878 | static unsigned int early_drop_list(struct net *net, |
| 879 | struct hlist_nulls_head *head) |
| 880 | { |
| 881 | struct nf_conntrack_tuple_hash *h; |
| 882 | struct hlist_nulls_node *n; |
| 883 | unsigned int drops = 0; |
| 884 | struct nf_conn *tmp; |
| 885 | |
| 886 | hlist_nulls_for_each_entry_rcu(h, n, head, hnnode) { |
| 887 | tmp = nf_ct_tuplehash_to_ctrack(h); |
| 888 | |
Florian Westphal | f330a7f | 2016-08-25 15:33:31 +0200 | [diff] [blame] | 889 | if (nf_ct_is_expired(tmp)) { |
| 890 | nf_ct_gc_expired(tmp); |
| 891 | continue; |
| 892 | } |
| 893 | |
Florian Westphal | 242922a | 2016-07-03 20:44:01 +0200 | [diff] [blame] | 894 | if (test_bit(IPS_ASSURED_BIT, &tmp->status) || |
| 895 | !net_eq(nf_ct_net(tmp), net) || |
| 896 | nf_ct_is_dying(tmp)) |
| 897 | continue; |
| 898 | |
| 899 | if (!atomic_inc_not_zero(&tmp->ct_general.use)) |
| 900 | continue; |
| 901 | |
| 902 | /* kill only if still in same netns -- might have moved due to |
| 903 | * SLAB_DESTROY_BY_RCU rules. |
| 904 | * |
| 905 | * We steal the timer reference. If that fails timer has |
| 906 | * already fired or someone else deleted it. Just drop ref |
| 907 | * and move to next entry. |
| 908 | */ |
| 909 | if (net_eq(nf_ct_net(tmp), net) && |
| 910 | nf_ct_is_confirmed(tmp) && |
Florian Westphal | 242922a | 2016-07-03 20:44:01 +0200 | [diff] [blame] | 911 | nf_ct_delete(tmp, 0, 0)) |
| 912 | drops++; |
| 913 | |
| 914 | nf_ct_put(tmp); |
| 915 | } |
| 916 | |
| 917 | return drops; |
| 918 | } |
| 919 | |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 920 | static noinline int early_drop(struct net *net, unsigned int _hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 921 | { |
Florian Westphal | 242922a | 2016-07-03 20:44:01 +0200 | [diff] [blame] | 922 | unsigned int i; |
Florian Westphal | 3e86638 | 2016-05-02 18:40:14 +0200 | [diff] [blame] | 923 | |
Florian Westphal | 242922a | 2016-07-03 20:44:01 +0200 | [diff] [blame] | 924 | for (i = 0; i < NF_CT_EVICTION_RANGE; i++) { |
| 925 | struct hlist_nulls_head *ct_hash; |
Liping Zhang | 92e47ba | 2016-08-13 22:35:36 +0800 | [diff] [blame] | 926 | unsigned int hash, hsize, drops; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 927 | |
Liping Zhang | 3101e0f | 2016-07-12 19:45:00 +0800 | [diff] [blame] | 928 | rcu_read_lock(); |
Liping Zhang | 92e47ba | 2016-08-13 22:35:36 +0800 | [diff] [blame] | 929 | nf_conntrack_get_ht(&ct_hash, &hsize); |
| 930 | hash = reciprocal_scale(_hash++, hsize); |
Florian Westphal | 3e86638 | 2016-05-02 18:40:14 +0200 | [diff] [blame] | 931 | |
Florian Westphal | 242922a | 2016-07-03 20:44:01 +0200 | [diff] [blame] | 932 | drops = early_drop_list(net, &ct_hash[hash]); |
Liping Zhang | 3101e0f | 2016-07-12 19:45:00 +0800 | [diff] [blame] | 933 | rcu_read_unlock(); |
Florian Westphal | 3e86638 | 2016-05-02 18:40:14 +0200 | [diff] [blame] | 934 | |
Florian Westphal | 242922a | 2016-07-03 20:44:01 +0200 | [diff] [blame] | 935 | if (drops) { |
| 936 | NF_CT_STAT_ADD_ATOMIC(net, early_drop, drops); |
| 937 | return true; |
Pablo Neira Ayuso | 74138511 | 2012-03-06 01:22:55 +0000 | [diff] [blame] | 938 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 939 | } |
Florian Westphal | 3e86638 | 2016-05-02 18:40:14 +0200 | [diff] [blame] | 940 | |
Florian Westphal | 242922a | 2016-07-03 20:44:01 +0200 | [diff] [blame] | 941 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 942 | } |
| 943 | |
Florian Westphal | b87a2f9 | 2016-08-25 15:33:33 +0200 | [diff] [blame^] | 944 | static void gc_worker(struct work_struct *work) |
| 945 | { |
| 946 | unsigned int i, goal, buckets = 0, expired_count = 0; |
| 947 | unsigned long next_run = GC_INTERVAL; |
| 948 | struct conntrack_gc_work *gc_work; |
| 949 | |
| 950 | gc_work = container_of(work, struct conntrack_gc_work, dwork.work); |
| 951 | |
| 952 | goal = min(nf_conntrack_htable_size / GC_MAX_BUCKETS_DIV, GC_MAX_BUCKETS); |
| 953 | i = gc_work->last_bucket; |
| 954 | |
| 955 | do { |
| 956 | struct nf_conntrack_tuple_hash *h; |
| 957 | struct hlist_nulls_head *ct_hash; |
| 958 | struct hlist_nulls_node *n; |
| 959 | unsigned int hashsz; |
| 960 | struct nf_conn *tmp; |
| 961 | |
| 962 | i++; |
| 963 | rcu_read_lock(); |
| 964 | |
| 965 | nf_conntrack_get_ht(&ct_hash, &hashsz); |
| 966 | if (i >= hashsz) |
| 967 | i = 0; |
| 968 | |
| 969 | hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[i], hnnode) { |
| 970 | tmp = nf_ct_tuplehash_to_ctrack(h); |
| 971 | |
| 972 | if (nf_ct_is_expired(tmp)) { |
| 973 | nf_ct_gc_expired(tmp); |
| 974 | expired_count++; |
| 975 | continue; |
| 976 | } |
| 977 | } |
| 978 | |
| 979 | /* could check get_nulls_value() here and restart if ct |
| 980 | * was moved to another chain. But given gc is best-effort |
| 981 | * we will just continue with next hash slot. |
| 982 | */ |
| 983 | rcu_read_unlock(); |
| 984 | cond_resched_rcu_qs(); |
| 985 | } while (++buckets < goal && |
| 986 | expired_count < GC_MAX_EVICTS); |
| 987 | |
| 988 | if (gc_work->exiting) |
| 989 | return; |
| 990 | |
| 991 | gc_work->last_bucket = i; |
| 992 | schedule_delayed_work(&gc_work->dwork, next_run); |
| 993 | } |
| 994 | |
| 995 | static void conntrack_gc_work_init(struct conntrack_gc_work *gc_work) |
| 996 | { |
| 997 | INIT_DELAYED_WORK(&gc_work->dwork, gc_worker); |
| 998 | gc_work->exiting = false; |
| 999 | } |
| 1000 | |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 1001 | static struct nf_conn * |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 1002 | __nf_conntrack_alloc(struct net *net, |
| 1003 | const struct nf_conntrack_zone *zone, |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 1004 | const struct nf_conntrack_tuple *orig, |
| 1005 | const struct nf_conntrack_tuple *repl, |
| 1006 | gfp_t gfp, u32 hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1007 | { |
Julia Lawall | cd7fcbf | 2009-01-12 00:06:08 +0000 | [diff] [blame] | 1008 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1009 | |
Pablo Neira Ayuso | 5251e2d | 2006-09-20 12:01:06 -0700 | [diff] [blame] | 1010 | /* We don't want any race condition at early drop stage */ |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1011 | atomic_inc(&net->ct.count); |
Pablo Neira Ayuso | 5251e2d | 2006-09-20 12:01:06 -0700 | [diff] [blame] | 1012 | |
Patrick McHardy | 76eb946 | 2008-01-31 04:41:44 -0800 | [diff] [blame] | 1013 | if (nf_conntrack_max && |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1014 | unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1015 | if (!early_drop(net, hash)) { |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1016 | atomic_dec(&net->ct.count); |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1017 | net_warn_ratelimited("nf_conntrack: table full, dropping packet\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1018 | return ERR_PTR(-ENOMEM); |
| 1019 | } |
| 1020 | } |
| 1021 | |
Eric Dumazet | 941297f | 2009-07-16 14:03:40 +0200 | [diff] [blame] | 1022 | /* |
| 1023 | * Do not use kmem_cache_zalloc(), as this cache uses |
| 1024 | * SLAB_DESTROY_BY_RCU. |
| 1025 | */ |
Florian Westphal | 0c5366b | 2016-05-09 16:24:32 +0200 | [diff] [blame] | 1026 | ct = kmem_cache_alloc(nf_conntrack_cachep, gfp); |
Daniel Borkmann | 5e8018f | 2015-08-14 16:03:40 +0200 | [diff] [blame] | 1027 | if (ct == NULL) |
| 1028 | goto out; |
| 1029 | |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 1030 | spin_lock_init(&ct->lock); |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 1031 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
Eric Dumazet | 941297f | 2009-07-16 14:03:40 +0200 | [diff] [blame] | 1032 | ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL; |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 1033 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 1034 | /* save hash for reusing when confirming */ |
| 1035 | *(unsigned long *)(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev) = hash; |
Florian Westphal | c41884c | 2014-11-24 15:25:57 +0100 | [diff] [blame] | 1036 | ct->status = 0; |
Eric Dumazet | c2d9ba9 | 2010-06-01 06:51:19 +0000 | [diff] [blame] | 1037 | write_pnet(&ct->ct_net, net); |
Florian Westphal | c41884c | 2014-11-24 15:25:57 +0100 | [diff] [blame] | 1038 | memset(&ct->__nfct_init_offset[0], 0, |
| 1039 | offsetof(struct nf_conn, proto) - |
| 1040 | offsetof(struct nf_conn, __nfct_init_offset[0])); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1041 | |
Florian Westphal | 6c8dee9 | 2016-06-11 21:57:35 +0200 | [diff] [blame] | 1042 | nf_ct_zone_add(ct, zone); |
Daniel Borkmann | 5e8018f | 2015-08-14 16:03:40 +0200 | [diff] [blame] | 1043 | |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 1044 | /* Because we use RCU lookups, we set ct_general.use to zero before |
| 1045 | * this is inserted in any list. |
Eric Dumazet | 941297f | 2009-07-16 14:03:40 +0200 | [diff] [blame] | 1046 | */ |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 1047 | atomic_set(&ct->ct_general.use, 0); |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 1048 | return ct; |
Daniel Borkmann | 5e8018f | 2015-08-14 16:03:40 +0200 | [diff] [blame] | 1049 | out: |
| 1050 | atomic_dec(&net->ct.count); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1051 | return ERR_PTR(-ENOMEM); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1052 | } |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 1053 | |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 1054 | struct nf_conn *nf_conntrack_alloc(struct net *net, |
| 1055 | const struct nf_conntrack_zone *zone, |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 1056 | const struct nf_conntrack_tuple *orig, |
| 1057 | const struct nf_conntrack_tuple *repl, |
| 1058 | gfp_t gfp) |
| 1059 | { |
| 1060 | return __nf_conntrack_alloc(net, zone, orig, repl, gfp, 0); |
| 1061 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1062 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1063 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 1064 | void nf_conntrack_free(struct nf_conn *ct) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1065 | { |
Eric Dumazet | 1d45209 | 2009-03-24 14:26:50 +0100 | [diff] [blame] | 1066 | struct net *net = nf_ct_net(ct); |
| 1067 | |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 1068 | /* A freed object has refcnt == 0, that's |
| 1069 | * the golden rule for SLAB_DESTROY_BY_RCU |
| 1070 | */ |
| 1071 | NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 0); |
| 1072 | |
Patrick McHardy | ceeff75 | 2008-06-11 17:51:10 -0700 | [diff] [blame] | 1073 | nf_ct_ext_destroy(ct); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1074 | nf_ct_ext_free(ct); |
Florian Westphal | 0c5366b | 2016-05-09 16:24:32 +0200 | [diff] [blame] | 1075 | kmem_cache_free(nf_conntrack_cachep, ct); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 1076 | smp_mb__before_atomic(); |
Pablo Neira Ayuso | 0c3c6c0 | 2013-11-18 12:53:59 +0100 | [diff] [blame] | 1077 | atomic_dec(&net->ct.count); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1078 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1079 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1080 | |
Florian Westphal | c539f01 | 2013-01-11 06:30:44 +0000 | [diff] [blame] | 1081 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1082 | /* Allocate a new conntrack: we return -ENOMEM if classification |
| 1083 | failed due to stress. Otherwise it really is unclassifiable. */ |
| 1084 | static struct nf_conntrack_tuple_hash * |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1085 | init_conntrack(struct net *net, struct nf_conn *tmpl, |
Alexey Dobriyan | 5a1fb39 | 2008-10-08 11:35:02 +0200 | [diff] [blame] | 1086 | const struct nf_conntrack_tuple *tuple, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1087 | struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 1088 | struct nf_conntrack_l4proto *l4proto, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1089 | struct sk_buff *skb, |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1090 | unsigned int dataoff, u32 hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1091 | { |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 1092 | struct nf_conn *ct; |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 1093 | struct nf_conn_help *help; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1094 | struct nf_conntrack_tuple repl_tuple; |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1095 | struct nf_conntrack_ecache *ecache; |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 1096 | struct nf_conntrack_expect *exp = NULL; |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 1097 | const struct nf_conntrack_zone *zone; |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1098 | struct nf_conn_timeout *timeout_ext; |
Daniel Borkmann | 5e8018f | 2015-08-14 16:03:40 +0200 | [diff] [blame] | 1099 | struct nf_conntrack_zone tmp; |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1100 | unsigned int *timeouts; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1101 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 1102 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1103 | pr_debug("Can't invert tuple.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1104 | return NULL; |
| 1105 | } |
| 1106 | |
Daniel Borkmann | 5e8018f | 2015-08-14 16:03:40 +0200 | [diff] [blame] | 1107 | zone = nf_ct_zone_tmpl(tmpl, skb, &tmp); |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 1108 | ct = __nf_conntrack_alloc(net, zone, tuple, &repl_tuple, GFP_ATOMIC, |
| 1109 | hash); |
Joe Perches | 0a9ee81 | 2011-08-29 14:17:25 -0700 | [diff] [blame] | 1110 | if (IS_ERR(ct)) |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 1111 | return (struct nf_conntrack_tuple_hash *)ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1112 | |
Patrick McHardy | 48b1de4 | 2013-08-27 08:50:14 +0200 | [diff] [blame] | 1113 | if (tmpl && nfct_synproxy(tmpl)) { |
| 1114 | nfct_seqadj_ext_add(ct); |
| 1115 | nfct_synproxy_ext_add(ct); |
| 1116 | } |
| 1117 | |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1118 | timeout_ext = tmpl ? nf_ct_timeout_find(tmpl) : NULL; |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 1119 | if (timeout_ext) { |
| 1120 | timeouts = nf_ct_timeout_data(timeout_ext); |
| 1121 | if (unlikely(!timeouts)) |
| 1122 | timeouts = l4proto->get_timeouts(net); |
| 1123 | } else { |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1124 | timeouts = l4proto->get_timeouts(net); |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 1125 | } |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1126 | |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 1127 | if (!l4proto->new(ct, skb, dataoff, timeouts)) { |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 1128 | nf_conntrack_free(ct); |
Weongyo Jeong | ccd63c2 | 2016-03-15 10:57:44 -0700 | [diff] [blame] | 1129 | pr_debug("can't track with proto module\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1130 | return NULL; |
| 1131 | } |
| 1132 | |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1133 | if (timeout_ext) |
Pablo Neira Ayuso | ae2d708 | 2015-10-05 16:51:01 +0200 | [diff] [blame] | 1134 | nf_ct_timeout_ext_add(ct, rcu_dereference(timeout_ext->timeout), |
| 1135 | GFP_ATOMIC); |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1136 | |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1137 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 1138 | nf_ct_tstamp_ext_add(ct, GFP_ATOMIC); |
Florian Westphal | c539f01 | 2013-01-11 06:30:44 +0000 | [diff] [blame] | 1139 | nf_ct_labels_ext_add(ct); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1140 | |
| 1141 | ecache = tmpl ? nf_ct_ecache_find(tmpl) : NULL; |
| 1142 | nf_ct_ecache_ext_add(ct, ecache ? ecache->ctmask : 0, |
| 1143 | ecache ? ecache->expmask : 0, |
| 1144 | GFP_ATOMIC); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1145 | |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 1146 | local_bh_disable(); |
| 1147 | if (net->ct.expect_count) { |
| 1148 | spin_lock(&nf_conntrack_expect_lock); |
| 1149 | exp = nf_ct_find_expectation(net, zone, tuple); |
| 1150 | if (exp) { |
Weongyo Jeong | ccd63c2 | 2016-03-15 10:57:44 -0700 | [diff] [blame] | 1151 | pr_debug("expectation arrives ct=%p exp=%p\n", |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 1152 | ct, exp); |
| 1153 | /* Welcome, Mr. Bond. We've been expecting you... */ |
| 1154 | __set_bit(IPS_EXPECTED_BIT, &ct->status); |
| 1155 | /* exp->master safe, refcnt bumped in nf_ct_find_expectation */ |
| 1156 | ct->master = exp->master; |
| 1157 | if (exp->helper) { |
| 1158 | help = nf_ct_helper_ext_add(ct, exp->helper, |
| 1159 | GFP_ATOMIC); |
| 1160 | if (help) |
| 1161 | rcu_assign_pointer(help->helper, exp->helper); |
| 1162 | } |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 1163 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1164 | #ifdef CONFIG_NF_CONNTRACK_MARK |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 1165 | ct->mark = exp->master->mark; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1166 | #endif |
James Morris | 7c9728c | 2006-06-09 00:31:46 -0700 | [diff] [blame] | 1167 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 1168 | ct->secmark = exp->master->secmark; |
James Morris | 7c9728c | 2006-06-09 00:31:46 -0700 | [diff] [blame] | 1169 | #endif |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 1170 | NF_CT_STAT_INC(net, expect_new); |
| 1171 | } |
| 1172 | spin_unlock(&nf_conntrack_expect_lock); |
| 1173 | } |
| 1174 | if (!exp) { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1175 | __nf_ct_try_assign_helper(ct, tmpl, GFP_ATOMIC); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1176 | NF_CT_STAT_INC(net, new); |
Yasuyuki Kozakai | 22e7410 | 2006-11-27 10:25:59 -0800 | [diff] [blame] | 1177 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1178 | |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 1179 | /* Now it is inserted into the unconfirmed list, bump refcount */ |
| 1180 | nf_conntrack_get(&ct->ct_general); |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1181 | nf_ct_add_to_unconfirmed_list(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1182 | |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 1183 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1184 | |
| 1185 | if (exp) { |
| 1186 | if (exp->expectfn) |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 1187 | exp->expectfn(ct, exp); |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1188 | nf_ct_expect_put(exp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1189 | } |
| 1190 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 1191 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1192 | } |
| 1193 | |
| 1194 | /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ |
| 1195 | static inline struct nf_conn * |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1196 | resolve_normal_ct(struct net *net, struct nf_conn *tmpl, |
Alexey Dobriyan | a702a65 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 1197 | struct sk_buff *skb, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1198 | unsigned int dataoff, |
| 1199 | u_int16_t l3num, |
| 1200 | u_int8_t protonum, |
| 1201 | struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 1202 | struct nf_conntrack_l4proto *l4proto, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1203 | int *set_reply, |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1204 | enum ip_conntrack_info *ctinfo) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1205 | { |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 1206 | const struct nf_conntrack_zone *zone; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1207 | struct nf_conntrack_tuple tuple; |
| 1208 | struct nf_conntrack_tuple_hash *h; |
Daniel Borkmann | 5e8018f | 2015-08-14 16:03:40 +0200 | [diff] [blame] | 1209 | struct nf_conntrack_zone tmp; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1210 | struct nf_conn *ct; |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 1211 | u32 hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1212 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1213 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
Eric W. Biederman | a31f1ad | 2015-09-18 14:33:04 -0500 | [diff] [blame] | 1214 | dataoff, l3num, protonum, net, &tuple, l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 1215 | l4proto)) { |
Weongyo Jeong | ccd63c2 | 2016-03-15 10:57:44 -0700 | [diff] [blame] | 1216 | pr_debug("Can't get tuple\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1217 | return NULL; |
| 1218 | } |
| 1219 | |
| 1220 | /* look for tuple match */ |
Daniel Borkmann | 5e8018f | 2015-08-14 16:03:40 +0200 | [diff] [blame] | 1221 | zone = nf_ct_zone_tmpl(tmpl, skb, &tmp); |
Florian Westphal | 1b8c8a9 | 2016-05-03 00:25:58 +0200 | [diff] [blame] | 1222 | hash = hash_conntrack_raw(&tuple, net); |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 1223 | h = __nf_conntrack_find_get(net, zone, &tuple, hash); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1224 | if (!h) { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1225 | h = init_conntrack(net, tmpl, &tuple, l3proto, l4proto, |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1226 | skb, dataoff, hash); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1227 | if (!h) |
| 1228 | return NULL; |
| 1229 | if (IS_ERR(h)) |
| 1230 | return (void *)h; |
| 1231 | } |
| 1232 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 1233 | |
| 1234 | /* It exists; we have (non-exclusive) reference. */ |
| 1235 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 1236 | *ctinfo = IP_CT_ESTABLISHED_REPLY; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1237 | /* Please set reply bit if this packet OK */ |
| 1238 | *set_reply = 1; |
| 1239 | } else { |
| 1240 | /* Once we've had two way comms, always ESTABLISHED. */ |
| 1241 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
Weongyo Jeong | ccd63c2 | 2016-03-15 10:57:44 -0700 | [diff] [blame] | 1242 | pr_debug("normal packet for %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1243 | *ctinfo = IP_CT_ESTABLISHED; |
| 1244 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { |
Weongyo Jeong | ccd63c2 | 2016-03-15 10:57:44 -0700 | [diff] [blame] | 1245 | pr_debug("related packet for %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1246 | *ctinfo = IP_CT_RELATED; |
| 1247 | } else { |
Weongyo Jeong | ccd63c2 | 2016-03-15 10:57:44 -0700 | [diff] [blame] | 1248 | pr_debug("new packet for %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1249 | *ctinfo = IP_CT_NEW; |
| 1250 | } |
| 1251 | *set_reply = 0; |
| 1252 | } |
| 1253 | skb->nfct = &ct->ct_general; |
| 1254 | skb->nfctinfo = *ctinfo; |
| 1255 | return ct; |
| 1256 | } |
| 1257 | |
| 1258 | unsigned int |
Alexey Dobriyan | a702a65 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 1259 | nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, |
| 1260 | struct sk_buff *skb) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1261 | { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1262 | struct nf_conn *ct, *tmpl = NULL; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1263 | enum ip_conntrack_info ctinfo; |
| 1264 | struct nf_conntrack_l3proto *l3proto; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 1265 | struct nf_conntrack_l4proto *l4proto; |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 1266 | unsigned int *timeouts; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1267 | unsigned int dataoff; |
| 1268 | u_int8_t protonum; |
| 1269 | int set_reply = 0; |
| 1270 | int ret; |
| 1271 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1272 | if (skb->nfct) { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1273 | /* Previously seen (loopback or untracked)? Ignore. */ |
| 1274 | tmpl = (struct nf_conn *)skb->nfct; |
| 1275 | if (!nf_ct_is_template(tmpl)) { |
| 1276 | NF_CT_STAT_INC_ATOMIC(net, ignore); |
| 1277 | return NF_ACCEPT; |
| 1278 | } |
| 1279 | skb->nfct = NULL; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1280 | } |
| 1281 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 1282 | /* rcu_read_lock()ed by nf_hook_slow */ |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 1283 | l3proto = __nf_ct_l3proto_find(pf); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1284 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
Yasuyuki Kozakai | ffc3069 | 2007-07-14 20:44:50 -0700 | [diff] [blame] | 1285 | &dataoff, &protonum); |
| 1286 | if (ret <= 0) { |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1287 | pr_debug("not prepared to track yet or error occurred\n"); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1288 | NF_CT_STAT_INC_ATOMIC(net, error); |
| 1289 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1290 | ret = -ret; |
| 1291 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1292 | } |
| 1293 | |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 1294 | l4proto = __nf_ct_l4proto_find(pf, protonum); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1295 | |
| 1296 | /* It may be an special packet, error, unclean... |
| 1297 | * inverse of the return code tells to the netfilter |
| 1298 | * core what to do with the packet. */ |
Alexey Dobriyan | 74c51a1 | 2008-10-08 11:35:05 +0200 | [diff] [blame] | 1299 | if (l4proto->error != NULL) { |
Patrick McHardy | 8fea97e | 2010-02-15 17:45:08 +0100 | [diff] [blame] | 1300 | ret = l4proto->error(net, tmpl, skb, dataoff, &ctinfo, |
| 1301 | pf, hooknum); |
Alexey Dobriyan | 74c51a1 | 2008-10-08 11:35:05 +0200 | [diff] [blame] | 1302 | if (ret <= 0) { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1303 | NF_CT_STAT_INC_ATOMIC(net, error); |
| 1304 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1305 | ret = -ret; |
| 1306 | goto out; |
Alexey Dobriyan | 74c51a1 | 2008-10-08 11:35:05 +0200 | [diff] [blame] | 1307 | } |
Pablo Neira Ayuso | 88ed01d | 2011-06-02 15:08:45 +0200 | [diff] [blame] | 1308 | /* ICMP[v6] protocol trackers may assign one conntrack. */ |
| 1309 | if (skb->nfct) |
| 1310 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1311 | } |
| 1312 | |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1313 | ct = resolve_normal_ct(net, tmpl, skb, dataoff, pf, protonum, |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1314 | l3proto, l4proto, &set_reply, &ctinfo); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1315 | if (!ct) { |
| 1316 | /* Not valid part of a connection */ |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1317 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1318 | ret = NF_ACCEPT; |
| 1319 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1320 | } |
| 1321 | |
| 1322 | if (IS_ERR(ct)) { |
| 1323 | /* Too stressed to deal. */ |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1324 | NF_CT_STAT_INC_ATOMIC(net, drop); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1325 | ret = NF_DROP; |
| 1326 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1327 | } |
| 1328 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1329 | NF_CT_ASSERT(skb->nfct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1330 | |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1331 | /* Decide what timeout policy we want to apply to this flow. */ |
Pablo Neira Ayuso | 84b5ee9 | 2012-08-28 00:53:15 +0000 | [diff] [blame] | 1332 | timeouts = nf_ct_timeout_lookup(net, ct, l4proto); |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1333 | |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 1334 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum, timeouts); |
Christoph Paasch | ec8d540 | 2009-03-16 15:51:29 +0100 | [diff] [blame] | 1335 | if (ret <= 0) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1336 | /* Invalid: inverse of the return code tells |
| 1337 | * the netfilter core what to do */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1338 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1339 | nf_conntrack_put(skb->nfct); |
| 1340 | skb->nfct = NULL; |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1341 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Pablo Neira Ayuso | 7d1e045 | 2009-02-24 14:48:01 +0100 | [diff] [blame] | 1342 | if (ret == -NF_DROP) |
| 1343 | NF_CT_STAT_INC_ATOMIC(net, drop); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1344 | ret = -ret; |
| 1345 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1346 | } |
| 1347 | |
| 1348 | if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) |
Patrick McHardy | 858b3133 | 2010-02-03 13:48:53 +0100 | [diff] [blame] | 1349 | nf_conntrack_event_cache(IPCT_REPLY, ct); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1350 | out: |
Pablo Neira Ayuso | c317428 | 2011-02-09 08:08:20 +0100 | [diff] [blame] | 1351 | if (tmpl) { |
| 1352 | /* Special case: we have to repeat this hook, assign the |
| 1353 | * template again to this packet. We assume that this packet |
| 1354 | * has no conntrack assigned. This is used by nf_ct_tcp. */ |
| 1355 | if (ret == NF_REPEAT) |
| 1356 | skb->nfct = (struct nf_conntrack *)tmpl; |
| 1357 | else |
| 1358 | nf_ct_put(tmpl); |
| 1359 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1360 | |
| 1361 | return ret; |
| 1362 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1363 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1364 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 1365 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
| 1366 | const struct nf_conntrack_tuple *orig) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1367 | { |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 1368 | bool ret; |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 1369 | |
| 1370 | rcu_read_lock(); |
| 1371 | ret = nf_ct_invert_tuple(inverse, orig, |
| 1372 | __nf_ct_l3proto_find(orig->src.l3num), |
| 1373 | __nf_ct_l4proto_find(orig->src.l3num, |
| 1374 | orig->dst.protonum)); |
| 1375 | rcu_read_unlock(); |
| 1376 | return ret; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1377 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1378 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1379 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1380 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
| 1381 | implicitly racy: see __nf_conntrack_confirm */ |
| 1382 | void nf_conntrack_alter_reply(struct nf_conn *ct, |
| 1383 | const struct nf_conntrack_tuple *newreply) |
| 1384 | { |
| 1385 | struct nf_conn_help *help = nfct_help(ct); |
| 1386 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1387 | /* Should be unconfirmed, so not in hash table yet */ |
| 1388 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
| 1389 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1390 | pr_debug("Altering reply tuple of %p to ", ct); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1391 | nf_ct_dump_tuple(newreply); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1392 | |
| 1393 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; |
Patrick McHardy | ef1a5a5 | 2008-04-14 11:21:01 +0200 | [diff] [blame] | 1394 | if (ct->master || (help && !hlist_empty(&help->expectations))) |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 1395 | return; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 1396 | |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 1397 | rcu_read_lock(); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1398 | __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC); |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 1399 | rcu_read_unlock(); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1400 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1401 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1402 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1403 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
| 1404 | void __nf_ct_refresh_acct(struct nf_conn *ct, |
| 1405 | enum ip_conntrack_info ctinfo, |
| 1406 | const struct sk_buff *skb, |
| 1407 | unsigned long extra_jiffies, |
| 1408 | int do_acct) |
| 1409 | { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1410 | NF_CT_ASSERT(skb); |
| 1411 | |
Eric Leblond | 997ae83 | 2006-05-29 18:24:20 -0700 | [diff] [blame] | 1412 | /* Only update if this is not a fixed timeout */ |
Patrick McHardy | 47d9504 | 2008-01-31 04:36:31 -0800 | [diff] [blame] | 1413 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
| 1414 | goto acct; |
Eric Leblond | 997ae83 | 2006-05-29 18:24:20 -0700 | [diff] [blame] | 1415 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1416 | /* If not in hash table, timer will not be active yet */ |
Florian Westphal | f330a7f | 2016-08-25 15:33:31 +0200 | [diff] [blame] | 1417 | if (nf_ct_is_confirmed(ct)) |
| 1418 | extra_jiffies += nfct_time_stamp; |
Martin Josefsson | be00c8e | 2006-11-29 02:35:12 +0100 | [diff] [blame] | 1419 | |
Florian Westphal | f330a7f | 2016-08-25 15:33:31 +0200 | [diff] [blame] | 1420 | ct->timeout = extra_jiffies; |
Patrick McHardy | 47d9504 | 2008-01-31 04:36:31 -0800 | [diff] [blame] | 1421 | acct: |
Pablo Neira Ayuso | ba76738 | 2016-05-02 21:28:57 +0200 | [diff] [blame] | 1422 | if (do_acct) |
| 1423 | nf_ct_acct_update(ct, ctinfo, skb->len); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1424 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1425 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1426 | |
David S. Miller | 4c88949 | 2008-07-14 20:22:38 -0700 | [diff] [blame] | 1427 | bool __nf_ct_kill_acct(struct nf_conn *ct, |
| 1428 | enum ip_conntrack_info ctinfo, |
| 1429 | const struct sk_buff *skb, |
| 1430 | int do_acct) |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 1431 | { |
Pablo Neira Ayuso | ba76738 | 2016-05-02 21:28:57 +0200 | [diff] [blame] | 1432 | if (do_acct) |
| 1433 | nf_ct_acct_update(ct, ctinfo, skb->len); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1434 | |
Florian Westphal | f330a7f | 2016-08-25 15:33:31 +0200 | [diff] [blame] | 1435 | return nf_ct_delete(ct, 0, 0); |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 1436 | } |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 1437 | EXPORT_SYMBOL_GPL(__nf_ct_kill_acct); |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 1438 | |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 1439 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1440 | |
| 1441 | #include <linux/netfilter/nfnetlink.h> |
| 1442 | #include <linux/netfilter/nfnetlink_conntrack.h> |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1443 | #include <linux/mutex.h> |
| 1444 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1445 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
| 1446 | * in ip_conntrack_core, since we don't want the protocols to autoload |
| 1447 | * or depend on ctnetlink */ |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 1448 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1449 | const struct nf_conntrack_tuple *tuple) |
| 1450 | { |
David S. Miller | bae65be | 2012-04-01 18:58:28 -0400 | [diff] [blame] | 1451 | if (nla_put_be16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port) || |
| 1452 | nla_put_be16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port)) |
| 1453 | goto nla_put_failure; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1454 | return 0; |
| 1455 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 1456 | nla_put_failure: |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1457 | return -1; |
| 1458 | } |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 1459 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1460 | |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 1461 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
| 1462 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, |
| 1463 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1464 | }; |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 1465 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1466 | |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 1467 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1468 | struct nf_conntrack_tuple *t) |
| 1469 | { |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 1470 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1471 | return -EINVAL; |
| 1472 | |
Patrick McHardy | 77236b6 | 2007-12-17 22:29:45 -0800 | [diff] [blame] | 1473 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
| 1474 | t->dst.u.tcp.port = nla_get_be16(tb[CTA_PROTO_DST_PORT]); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1475 | |
| 1476 | return 0; |
| 1477 | } |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 1478 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
Holger Eitzenberger | 5c0de29 | 2009-03-25 21:52:17 +0100 | [diff] [blame] | 1479 | |
| 1480 | int nf_ct_port_nlattr_tuple_size(void) |
| 1481 | { |
| 1482 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); |
| 1483 | } |
| 1484 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1485 | #endif |
| 1486 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1487 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
Patrick McHardy | 312a0c16 | 2013-07-28 22:54:08 +0200 | [diff] [blame] | 1488 | static void nf_conntrack_attach(struct sk_buff *nskb, const struct sk_buff *skb) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1489 | { |
| 1490 | struct nf_conn *ct; |
| 1491 | enum ip_conntrack_info ctinfo; |
| 1492 | |
| 1493 | /* This ICMP is in reverse direction to the packet which caused it */ |
| 1494 | ct = nf_ct_get(skb, &ctinfo); |
| 1495 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 1496 | ctinfo = IP_CT_RELATED_REPLY; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1497 | else |
| 1498 | ctinfo = IP_CT_RELATED; |
| 1499 | |
| 1500 | /* Attach to new skbuff, and increment count */ |
| 1501 | nskb->nfct = &ct->ct_general; |
| 1502 | nskb->nfctinfo = ctinfo; |
| 1503 | nf_conntrack_get(nskb->nfct); |
| 1504 | } |
| 1505 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1506 | /* Bring out ya dead! */ |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1507 | static struct nf_conn * |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1508 | get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data), |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1509 | void *data, unsigned int *bucket) |
| 1510 | { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1511 | struct nf_conntrack_tuple_hash *h; |
| 1512 | struct nf_conn *ct; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1513 | struct hlist_nulls_node *n; |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1514 | int cpu; |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1515 | spinlock_t *lockp; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1516 | |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 1517 | for (; *bucket < nf_conntrack_htable_size; (*bucket)++) { |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1518 | lockp = &nf_conntrack_locks[*bucket % CONNTRACK_LOCKS]; |
| 1519 | local_bh_disable(); |
Sasha Levin | b16c291 | 2016-01-18 19:23:51 -0500 | [diff] [blame] | 1520 | nf_conntrack_lock(lockp); |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 1521 | if (*bucket < nf_conntrack_htable_size) { |
| 1522 | hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[*bucket], hnnode) { |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1523 | if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
| 1524 | continue; |
| 1525 | ct = nf_ct_tuplehash_to_ctrack(h); |
Florian Westphal | e0c7d47 | 2016-04-28 19:13:45 +0200 | [diff] [blame] | 1526 | if (net_eq(nf_ct_net(ct), net) && |
| 1527 | iter(ct, data)) |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1528 | goto found; |
| 1529 | } |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1530 | } |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1531 | spin_unlock(lockp); |
| 1532 | local_bh_enable(); |
Florian Westphal | d93c625 | 2016-01-20 11:16:43 +0100 | [diff] [blame] | 1533 | cond_resched(); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1534 | } |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1535 | |
| 1536 | for_each_possible_cpu(cpu) { |
| 1537 | struct ct_pcpu *pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu); |
| 1538 | |
| 1539 | spin_lock_bh(&pcpu->lock); |
| 1540 | hlist_nulls_for_each_entry(h, n, &pcpu->unconfirmed, hnnode) { |
| 1541 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 1542 | if (iter(ct, data)) |
| 1543 | set_bit(IPS_DYING_BIT, &ct->status); |
| 1544 | } |
| 1545 | spin_unlock_bh(&pcpu->lock); |
Florian Westphal | d93c625 | 2016-01-20 11:16:43 +0100 | [diff] [blame] | 1546 | cond_resched(); |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1547 | } |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1548 | return NULL; |
| 1549 | found: |
Martin Josefsson | c073e3f | 2006-10-30 15:13:58 -0800 | [diff] [blame] | 1550 | atomic_inc(&ct->ct_general.use); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1551 | spin_unlock(lockp); |
| 1552 | local_bh_enable(); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1553 | return ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1554 | } |
| 1555 | |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1556 | void nf_ct_iterate_cleanup(struct net *net, |
| 1557 | int (*iter)(struct nf_conn *i, void *data), |
Florian Westphal | c655bc6 | 2013-07-29 15:41:55 +0200 | [diff] [blame] | 1558 | void *data, u32 portid, int report) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1559 | { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1560 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1561 | unsigned int bucket = 0; |
| 1562 | |
Florian Westphal | d93c625 | 2016-01-20 11:16:43 +0100 | [diff] [blame] | 1563 | might_sleep(); |
| 1564 | |
Florian Westphal | 88b68bc | 2016-04-28 19:13:42 +0200 | [diff] [blame] | 1565 | if (atomic_read(&net->ct.count) == 0) |
| 1566 | return; |
| 1567 | |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1568 | while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1569 | /* Time to push up daises... */ |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 1570 | |
Florian Westphal | f330a7f | 2016-08-25 15:33:31 +0200 | [diff] [blame] | 1571 | nf_ct_delete(ct, portid, report); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1572 | nf_ct_put(ct); |
Florian Westphal | d93c625 | 2016-01-20 11:16:43 +0100 | [diff] [blame] | 1573 | cond_resched(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1574 | } |
| 1575 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1576 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1577 | |
Pablo Neira Ayuso | 274d383 | 2009-06-02 20:08:38 +0200 | [diff] [blame] | 1578 | static int kill_all(struct nf_conn *i, void *data) |
| 1579 | { |
| 1580 | return 1; |
| 1581 | } |
| 1582 | |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1583 | void nf_ct_free_hashtable(void *hash, unsigned int size) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1584 | { |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1585 | if (is_vmalloc_addr(hash)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1586 | vfree(hash); |
| 1587 | else |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1588 | free_pages((unsigned long)hash, |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1589 | get_order(sizeof(struct hlist_head) * size)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1590 | } |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1591 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1592 | |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1593 | static int untrack_refs(void) |
| 1594 | { |
| 1595 | int cnt = 0, cpu; |
| 1596 | |
| 1597 | for_each_possible_cpu(cpu) { |
| 1598 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); |
| 1599 | |
| 1600 | cnt += atomic_read(&ct->ct_general.use) - 1; |
| 1601 | } |
| 1602 | return cnt; |
| 1603 | } |
| 1604 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1605 | void nf_conntrack_cleanup_start(void) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1606 | { |
Florian Westphal | b87a2f9 | 2016-08-25 15:33:33 +0200 | [diff] [blame^] | 1607 | conntrack_gc_work.exiting = true; |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1608 | RCU_INIT_POINTER(ip_ct_attach, NULL); |
| 1609 | } |
| 1610 | |
| 1611 | void nf_conntrack_cleanup_end(void) |
| 1612 | { |
| 1613 | RCU_INIT_POINTER(nf_ct_destroy, NULL); |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1614 | while (untrack_refs() > 0) |
Patrick McHardy | 9edd7ca | 2010-02-08 11:16:26 -0800 | [diff] [blame] | 1615 | schedule(); |
| 1616 | |
Florian Westphal | b87a2f9 | 2016-08-25 15:33:33 +0200 | [diff] [blame^] | 1617 | cancel_delayed_work_sync(&conntrack_gc_work.dwork); |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 1618 | nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_htable_size); |
| 1619 | |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1620 | nf_conntrack_proto_fini(); |
Patrick McHardy | 41d73ec | 2013-08-27 08:50:12 +0200 | [diff] [blame] | 1621 | nf_conntrack_seqadj_fini(); |
Gao feng | 5f69b8f | 2013-01-21 22:10:31 +0000 | [diff] [blame] | 1622 | nf_conntrack_labels_fini(); |
Gao feng | 5e615b2 | 2013-01-21 22:10:30 +0000 | [diff] [blame] | 1623 | nf_conntrack_helper_fini(); |
Gao feng | 8684094 | 2013-01-21 22:10:29 +0000 | [diff] [blame] | 1624 | nf_conntrack_timeout_fini(); |
Gao feng | 3fe0f94 | 2013-01-21 22:10:28 +0000 | [diff] [blame] | 1625 | nf_conntrack_ecache_fini(); |
Gao feng | 73f4001 | 2013-01-21 22:10:27 +0000 | [diff] [blame] | 1626 | nf_conntrack_tstamp_fini(); |
Gao feng | b7ff3a1 | 2013-01-21 22:10:26 +0000 | [diff] [blame] | 1627 | nf_conntrack_acct_fini(); |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 1628 | nf_conntrack_expect_fini(); |
Florian Westphal | 7757114 | 2016-06-10 17:25:19 +0200 | [diff] [blame] | 1629 | |
| 1630 | kmem_cache_destroy(nf_conntrack_cachep); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1631 | } |
Yasuyuki Kozakai | 7d3cdc6 | 2006-02-15 15:22:21 -0800 | [diff] [blame] | 1632 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1633 | /* |
| 1634 | * Mishearing the voices in his head, our hero wonders how he's |
| 1635 | * supposed to kill the mall. |
| 1636 | */ |
| 1637 | void nf_conntrack_cleanup_net(struct net *net) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1638 | { |
Vladimir Davydov | dece40e | 2013-03-13 23:40:14 +0000 | [diff] [blame] | 1639 | LIST_HEAD(single); |
| 1640 | |
| 1641 | list_add(&net->exit_list, &single); |
| 1642 | nf_conntrack_cleanup_net_list(&single); |
| 1643 | } |
| 1644 | |
| 1645 | void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list) |
| 1646 | { |
| 1647 | int busy; |
| 1648 | struct net *net; |
| 1649 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1650 | /* |
| 1651 | * This makes sure all current packets have passed through |
| 1652 | * netfilter framework. Roll on, two-stage module |
| 1653 | * delete... |
| 1654 | */ |
| 1655 | synchronize_net(); |
Vladimir Davydov | dece40e | 2013-03-13 23:40:14 +0000 | [diff] [blame] | 1656 | i_see_dead_people: |
| 1657 | busy = 0; |
| 1658 | list_for_each_entry(net, net_exit_list, exit_list) { |
Florian Westphal | c655bc6 | 2013-07-29 15:41:55 +0200 | [diff] [blame] | 1659 | nf_ct_iterate_cleanup(net, kill_all, NULL, 0, 0); |
Vladimir Davydov | dece40e | 2013-03-13 23:40:14 +0000 | [diff] [blame] | 1660 | if (atomic_read(&net->ct.count) != 0) |
| 1661 | busy = 1; |
| 1662 | } |
| 1663 | if (busy) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1664 | schedule(); |
| 1665 | goto i_see_dead_people; |
| 1666 | } |
| 1667 | |
Vladimir Davydov | dece40e | 2013-03-13 23:40:14 +0000 | [diff] [blame] | 1668 | list_for_each_entry(net, net_exit_list, exit_list) { |
Vladimir Davydov | dece40e | 2013-03-13 23:40:14 +0000 | [diff] [blame] | 1669 | nf_conntrack_proto_pernet_fini(net); |
| 1670 | nf_conntrack_helper_pernet_fini(net); |
| 1671 | nf_conntrack_ecache_pernet_fini(net); |
| 1672 | nf_conntrack_tstamp_pernet_fini(net); |
| 1673 | nf_conntrack_acct_pernet_fini(net); |
| 1674 | nf_conntrack_expect_pernet_fini(net); |
Vladimir Davydov | dece40e | 2013-03-13 23:40:14 +0000 | [diff] [blame] | 1675 | free_percpu(net->ct.stat); |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1676 | free_percpu(net->ct.pcpu_lists); |
Vladimir Davydov | dece40e | 2013-03-13 23:40:14 +0000 | [diff] [blame] | 1677 | } |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1678 | } |
| 1679 | |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1680 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1681 | { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1682 | struct hlist_nulls_head *hash; |
| 1683 | unsigned int nr_slots, i; |
| 1684 | size_t sz; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1685 | |
Florian Westphal | 9cc1c73 | 2016-04-24 01:18:21 +0200 | [diff] [blame] | 1686 | if (*sizep > (UINT_MAX / sizeof(struct hlist_nulls_head))) |
| 1687 | return NULL; |
| 1688 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1689 | BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); |
| 1690 | nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); |
Florian Westphal | 9cc1c73 | 2016-04-24 01:18:21 +0200 | [diff] [blame] | 1691 | |
| 1692 | if (nr_slots > (UINT_MAX / sizeof(struct hlist_nulls_head))) |
| 1693 | return NULL; |
| 1694 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1695 | sz = nr_slots * sizeof(struct hlist_nulls_head); |
| 1696 | hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, |
| 1697 | get_order(sz)); |
Pablo Neira Ayuso | f0ad462 | 2015-07-23 13:06:10 +0200 | [diff] [blame] | 1698 | if (!hash) |
Eric Dumazet | 966567b | 2011-12-19 16:01:38 -0500 | [diff] [blame] | 1699 | hash = vzalloc(sz); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1700 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1701 | if (hash && nulls) |
| 1702 | for (i = 0; i < nr_slots; i++) |
| 1703 | INIT_HLIST_NULLS_HEAD(&hash[i], i); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1704 | |
| 1705 | return hash; |
| 1706 | } |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1707 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1708 | |
Florian Westphal | 3183ab8 | 2016-06-22 13:26:10 +0200 | [diff] [blame] | 1709 | int nf_conntrack_hash_resize(unsigned int hashsize) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1710 | { |
Florian Westphal | 3183ab8 | 2016-06-22 13:26:10 +0200 | [diff] [blame] | 1711 | int i, bucket; |
| 1712 | unsigned int old_size; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1713 | struct hlist_nulls_head *hash, *old_hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1714 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1715 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1716 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1717 | if (!hashsize) |
| 1718 | return -EINVAL; |
| 1719 | |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1720 | hash = nf_ct_alloc_hashtable(&hashsize, 1); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1721 | if (!hash) |
| 1722 | return -ENOMEM; |
| 1723 | |
Florian Westphal | 3183ab8 | 2016-06-22 13:26:10 +0200 | [diff] [blame] | 1724 | old_size = nf_conntrack_htable_size; |
| 1725 | if (old_size == hashsize) { |
| 1726 | nf_ct_free_hashtable(hash, hashsize); |
| 1727 | return 0; |
| 1728 | } |
| 1729 | |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1730 | local_bh_disable(); |
| 1731 | nf_conntrack_all_lock(); |
Florian Westphal | a3efd81 | 2016-04-18 16:16:59 +0200 | [diff] [blame] | 1732 | write_seqcount_begin(&nf_conntrack_generation); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1733 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 1734 | /* Lookups in the old hash might happen in parallel, which means we |
| 1735 | * might get false negatives during connection lookup. New connections |
| 1736 | * created because of a false negative won't make it into the hash |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1737 | * though since that required taking the locks. |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 1738 | */ |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1739 | |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 1740 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
| 1741 | while (!hlist_nulls_empty(&nf_conntrack_hash[i])) { |
| 1742 | h = hlist_nulls_entry(nf_conntrack_hash[i].first, |
| 1743 | struct nf_conntrack_tuple_hash, hnnode); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1744 | ct = nf_ct_tuplehash_to_ctrack(h); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1745 | hlist_nulls_del_rcu(&h->hnnode); |
Florian Westphal | 1b8c8a9 | 2016-05-03 00:25:58 +0200 | [diff] [blame] | 1746 | bucket = __hash_conntrack(nf_ct_net(ct), |
| 1747 | &h->tuple, hashsize); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1748 | hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1749 | } |
| 1750 | } |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 1751 | old_size = nf_conntrack_htable_size; |
| 1752 | old_hash = nf_conntrack_hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1753 | |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 1754 | nf_conntrack_hash = hash; |
| 1755 | nf_conntrack_htable_size = hashsize; |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1756 | |
Florian Westphal | a3efd81 | 2016-04-18 16:16:59 +0200 | [diff] [blame] | 1757 | write_seqcount_end(&nf_conntrack_generation); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1758 | nf_conntrack_all_unlock(); |
| 1759 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1760 | |
Florian Westphal | 5e3c61f | 2016-04-28 19:13:41 +0200 | [diff] [blame] | 1761 | synchronize_net(); |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1762 | nf_ct_free_hashtable(old_hash, old_size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1763 | return 0; |
| 1764 | } |
Florian Westphal | 3183ab8 | 2016-06-22 13:26:10 +0200 | [diff] [blame] | 1765 | |
| 1766 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) |
| 1767 | { |
| 1768 | unsigned int hashsize; |
| 1769 | int rc; |
| 1770 | |
| 1771 | if (current->nsproxy->net_ns != &init_net) |
| 1772 | return -EOPNOTSUPP; |
| 1773 | |
| 1774 | /* On boot, we can set this without any fancy locking. */ |
| 1775 | if (!nf_conntrack_htable_size) |
| 1776 | return param_set_uint(val, kp); |
| 1777 | |
| 1778 | rc = kstrtouint(val, 0, &hashsize); |
| 1779 | if (rc) |
| 1780 | return rc; |
| 1781 | |
| 1782 | return nf_conntrack_hash_resize(hashsize); |
| 1783 | } |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1784 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1785 | |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1786 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1787 | &nf_conntrack_htable_size, 0600); |
| 1788 | |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 1789 | void nf_ct_untracked_status_or(unsigned long bits) |
| 1790 | { |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1791 | int cpu; |
| 1792 | |
| 1793 | for_each_possible_cpu(cpu) |
| 1794 | per_cpu(nf_conntrack_untracked, cpu).status |= bits; |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 1795 | } |
| 1796 | EXPORT_SYMBOL_GPL(nf_ct_untracked_status_or); |
| 1797 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1798 | int nf_conntrack_init_start(void) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1799 | { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1800 | int max_factor = 8; |
Florian Westphal | 0c5366b | 2016-05-09 16:24:32 +0200 | [diff] [blame] | 1801 | int ret = -ENOMEM; |
| 1802 | int i, cpu; |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1803 | |
Florian Westphal | a3efd81 | 2016-04-18 16:16:59 +0200 | [diff] [blame] | 1804 | seqcount_init(&nf_conntrack_generation); |
| 1805 | |
Eric Dumazet | d5d2091 | 2014-03-17 13:37:53 -0700 | [diff] [blame] | 1806 | for (i = 0; i < CONNTRACK_LOCKS; i++) |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1807 | spin_lock_init(&nf_conntrack_locks[i]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1808 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1809 | if (!nf_conntrack_htable_size) { |
Marcelo Leitner | 88eab47 | 2014-12-03 17:30:19 -0200 | [diff] [blame] | 1810 | /* Idea from tcp.c: use 1/16384 of memory. |
| 1811 | * On i386: 32MB machine has 512 buckets. |
| 1812 | * >= 1GB machines have 16384 buckets. |
| 1813 | * >= 4GB machines have 65536 buckets. |
| 1814 | */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1815 | nf_conntrack_htable_size |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 1816 | = (((totalram_pages << PAGE_SHIFT) / 16384) |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1817 | / sizeof(struct hlist_head)); |
Marcelo Leitner | 88eab47 | 2014-12-03 17:30:19 -0200 | [diff] [blame] | 1818 | if (totalram_pages > (4 * (1024 * 1024 * 1024 / PAGE_SIZE))) |
| 1819 | nf_conntrack_htable_size = 65536; |
| 1820 | else if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1821 | nf_conntrack_htable_size = 16384; |
| 1822 | if (nf_conntrack_htable_size < 32) |
| 1823 | nf_conntrack_htable_size = 32; |
| 1824 | |
| 1825 | /* Use a max. factor of four by default to get the same max as |
| 1826 | * with the old struct list_heads. When a table size is given |
| 1827 | * we use the old value of 8 to avoid reducing the max. |
| 1828 | * entries. */ |
| 1829 | max_factor = 4; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1830 | } |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 1831 | |
| 1832 | nf_conntrack_hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size, 1); |
| 1833 | if (!nf_conntrack_hash) |
| 1834 | return -ENOMEM; |
| 1835 | |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1836 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 1837 | |
Florian Westphal | 0c5366b | 2016-05-09 16:24:32 +0200 | [diff] [blame] | 1838 | nf_conntrack_cachep = kmem_cache_create("nf_conntrack", |
| 1839 | sizeof(struct nf_conn), 0, |
Florian Westphal | 5a75cde | 2016-06-10 22:25:22 +0200 | [diff] [blame] | 1840 | SLAB_DESTROY_BY_RCU | SLAB_HWCACHE_ALIGN, NULL); |
Florian Westphal | 0c5366b | 2016-05-09 16:24:32 +0200 | [diff] [blame] | 1841 | if (!nf_conntrack_cachep) |
| 1842 | goto err_cachep; |
| 1843 | |
Stephen Hemminger | 654d0fb | 2010-05-13 15:02:08 +0200 | [diff] [blame] | 1844 | printk(KERN_INFO "nf_conntrack version %s (%u buckets, %d max)\n", |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 1845 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, |
| 1846 | nf_conntrack_max); |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 1847 | |
| 1848 | ret = nf_conntrack_expect_init(); |
| 1849 | if (ret < 0) |
| 1850 | goto err_expect; |
| 1851 | |
Gao feng | b7ff3a1 | 2013-01-21 22:10:26 +0000 | [diff] [blame] | 1852 | ret = nf_conntrack_acct_init(); |
| 1853 | if (ret < 0) |
| 1854 | goto err_acct; |
| 1855 | |
Gao feng | 73f4001 | 2013-01-21 22:10:27 +0000 | [diff] [blame] | 1856 | ret = nf_conntrack_tstamp_init(); |
| 1857 | if (ret < 0) |
| 1858 | goto err_tstamp; |
| 1859 | |
Gao feng | 3fe0f94 | 2013-01-21 22:10:28 +0000 | [diff] [blame] | 1860 | ret = nf_conntrack_ecache_init(); |
| 1861 | if (ret < 0) |
| 1862 | goto err_ecache; |
| 1863 | |
Gao feng | 8684094 | 2013-01-21 22:10:29 +0000 | [diff] [blame] | 1864 | ret = nf_conntrack_timeout_init(); |
| 1865 | if (ret < 0) |
| 1866 | goto err_timeout; |
| 1867 | |
Gao feng | 5e615b2 | 2013-01-21 22:10:30 +0000 | [diff] [blame] | 1868 | ret = nf_conntrack_helper_init(); |
| 1869 | if (ret < 0) |
| 1870 | goto err_helper; |
| 1871 | |
Gao feng | 5f69b8f | 2013-01-21 22:10:31 +0000 | [diff] [blame] | 1872 | ret = nf_conntrack_labels_init(); |
| 1873 | if (ret < 0) |
| 1874 | goto err_labels; |
| 1875 | |
Patrick McHardy | 41d73ec | 2013-08-27 08:50:12 +0200 | [diff] [blame] | 1876 | ret = nf_conntrack_seqadj_init(); |
| 1877 | if (ret < 0) |
| 1878 | goto err_seqadj; |
| 1879 | |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1880 | ret = nf_conntrack_proto_init(); |
| 1881 | if (ret < 0) |
| 1882 | goto err_proto; |
| 1883 | |
Patrick McHardy | 9edd7ca | 2010-02-08 11:16:26 -0800 | [diff] [blame] | 1884 | /* Set up fake conntrack: to never be deleted, not in any hashes */ |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1885 | for_each_possible_cpu(cpu) { |
| 1886 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1887 | write_pnet(&ct->ct_net, &init_net); |
| 1888 | atomic_set(&ct->ct_general.use, 1); |
| 1889 | } |
Patrick McHardy | 9edd7ca | 2010-02-08 11:16:26 -0800 | [diff] [blame] | 1890 | /* - and look it like as a confirmed connection */ |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 1891 | nf_ct_untracked_status_or(IPS_CONFIRMED | IPS_UNTRACKED); |
Florian Westphal | b87a2f9 | 2016-08-25 15:33:33 +0200 | [diff] [blame^] | 1892 | |
| 1893 | conntrack_gc_work_init(&conntrack_gc_work); |
| 1894 | schedule_delayed_work(&conntrack_gc_work.dwork, GC_INTERVAL); |
| 1895 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1896 | return 0; |
| 1897 | |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1898 | err_proto: |
Patrick McHardy | 41d73ec | 2013-08-27 08:50:12 +0200 | [diff] [blame] | 1899 | nf_conntrack_seqadj_fini(); |
| 1900 | err_seqadj: |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1901 | nf_conntrack_labels_fini(); |
Gao feng | 5f69b8f | 2013-01-21 22:10:31 +0000 | [diff] [blame] | 1902 | err_labels: |
| 1903 | nf_conntrack_helper_fini(); |
Gao feng | 5e615b2 | 2013-01-21 22:10:30 +0000 | [diff] [blame] | 1904 | err_helper: |
| 1905 | nf_conntrack_timeout_fini(); |
Gao feng | 8684094 | 2013-01-21 22:10:29 +0000 | [diff] [blame] | 1906 | err_timeout: |
| 1907 | nf_conntrack_ecache_fini(); |
Gao feng | 3fe0f94 | 2013-01-21 22:10:28 +0000 | [diff] [blame] | 1908 | err_ecache: |
| 1909 | nf_conntrack_tstamp_fini(); |
Gao feng | 73f4001 | 2013-01-21 22:10:27 +0000 | [diff] [blame] | 1910 | err_tstamp: |
| 1911 | nf_conntrack_acct_fini(); |
Gao feng | b7ff3a1 | 2013-01-21 22:10:26 +0000 | [diff] [blame] | 1912 | err_acct: |
| 1913 | nf_conntrack_expect_fini(); |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 1914 | err_expect: |
Florian Westphal | 0c5366b | 2016-05-09 16:24:32 +0200 | [diff] [blame] | 1915 | kmem_cache_destroy(nf_conntrack_cachep); |
| 1916 | err_cachep: |
Florian Westphal | 56d52d4 | 2016-05-02 18:39:55 +0200 | [diff] [blame] | 1917 | nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_htable_size); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1918 | return ret; |
| 1919 | } |
| 1920 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1921 | void nf_conntrack_init_end(void) |
| 1922 | { |
| 1923 | /* For use by REJECT target */ |
| 1924 | RCU_INIT_POINTER(ip_ct_attach, nf_conntrack_attach); |
| 1925 | RCU_INIT_POINTER(nf_ct_destroy, destroy_conntrack); |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1926 | } |
| 1927 | |
Eric Dumazet | 8cc2019 | 2009-06-22 14:13:55 +0200 | [diff] [blame] | 1928 | /* |
| 1929 | * We need to use special "null" values, not used in hash table |
| 1930 | */ |
| 1931 | #define UNCONFIRMED_NULLS_VAL ((1<<30)+0) |
| 1932 | #define DYING_NULLS_VAL ((1<<30)+1) |
Pablo Neira Ayuso | 252b3e8 | 2012-12-11 04:07:42 +0000 | [diff] [blame] | 1933 | #define TEMPLATE_NULLS_VAL ((1<<30)+2) |
Eric Dumazet | 8cc2019 | 2009-06-22 14:13:55 +0200 | [diff] [blame] | 1934 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1935 | int nf_conntrack_init_net(struct net *net) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1936 | { |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1937 | int ret = -ENOMEM; |
| 1938 | int cpu; |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1939 | |
| 1940 | atomic_set(&net->ct.count, 0); |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1941 | |
| 1942 | net->ct.pcpu_lists = alloc_percpu(struct ct_pcpu); |
| 1943 | if (!net->ct.pcpu_lists) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1944 | goto err_stat; |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1945 | |
| 1946 | for_each_possible_cpu(cpu) { |
| 1947 | struct ct_pcpu *pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu); |
| 1948 | |
| 1949 | spin_lock_init(&pcpu->lock); |
| 1950 | INIT_HLIST_NULLS_HEAD(&pcpu->unconfirmed, UNCONFIRMED_NULLS_VAL); |
| 1951 | INIT_HLIST_NULLS_HEAD(&pcpu->dying, DYING_NULLS_VAL); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1952 | } |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 1953 | |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1954 | net->ct.stat = alloc_percpu(struct ip_conntrack_stat); |
| 1955 | if (!net->ct.stat) |
| 1956 | goto err_pcpu_lists; |
| 1957 | |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 1958 | ret = nf_conntrack_expect_pernet_init(net); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1959 | if (ret < 0) |
| 1960 | goto err_expect; |
Gao feng | b7ff3a1 | 2013-01-21 22:10:26 +0000 | [diff] [blame] | 1961 | ret = nf_conntrack_acct_pernet_init(net); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1962 | if (ret < 0) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1963 | goto err_acct; |
Gao feng | 73f4001 | 2013-01-21 22:10:27 +0000 | [diff] [blame] | 1964 | ret = nf_conntrack_tstamp_pernet_init(net); |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 1965 | if (ret < 0) |
| 1966 | goto err_tstamp; |
Gao feng | 3fe0f94 | 2013-01-21 22:10:28 +0000 | [diff] [blame] | 1967 | ret = nf_conntrack_ecache_pernet_init(net); |
Pablo Neira Ayuso | a0891aa | 2009-06-13 12:26:29 +0200 | [diff] [blame] | 1968 | if (ret < 0) |
| 1969 | goto err_ecache; |
Gao feng | 5e615b2 | 2013-01-21 22:10:30 +0000 | [diff] [blame] | 1970 | ret = nf_conntrack_helper_pernet_init(net); |
Eric Leblond | a900689 | 2012-04-18 11:20:41 +0200 | [diff] [blame] | 1971 | if (ret < 0) |
| 1972 | goto err_helper; |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1973 | ret = nf_conntrack_proto_pernet_init(net); |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1974 | if (ret < 0) |
| 1975 | goto err_proto; |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1976 | return 0; |
Florian Westphal | c539f01 | 2013-01-11 06:30:44 +0000 | [diff] [blame] | 1977 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1978 | err_proto: |
Gao feng | 5e615b2 | 2013-01-21 22:10:30 +0000 | [diff] [blame] | 1979 | nf_conntrack_helper_pernet_fini(net); |
Eric Leblond | a900689 | 2012-04-18 11:20:41 +0200 | [diff] [blame] | 1980 | err_helper: |
Gao feng | 3fe0f94 | 2013-01-21 22:10:28 +0000 | [diff] [blame] | 1981 | nf_conntrack_ecache_pernet_fini(net); |
Pablo Neira Ayuso | a0891aa | 2009-06-13 12:26:29 +0200 | [diff] [blame] | 1982 | err_ecache: |
Gao feng | 73f4001 | 2013-01-21 22:10:27 +0000 | [diff] [blame] | 1983 | nf_conntrack_tstamp_pernet_fini(net); |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 1984 | err_tstamp: |
Gao feng | b7ff3a1 | 2013-01-21 22:10:26 +0000 | [diff] [blame] | 1985 | nf_conntrack_acct_pernet_fini(net); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1986 | err_acct: |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 1987 | nf_conntrack_expect_pernet_fini(net); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1988 | err_expect: |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1989 | free_percpu(net->ct.stat); |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1990 | err_pcpu_lists: |
| 1991 | free_percpu(net->ct.pcpu_lists); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1992 | err_stat: |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1993 | return ret; |
| 1994 | } |