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 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 15 | #include <linux/types.h> |
| 16 | #include <linux/netfilter.h> |
| 17 | #include <linux/module.h> |
Alexey Dobriyan | d43c36d | 2009-10-07 17:09:06 +0400 | [diff] [blame] | 18 | #include <linux/sched.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 19 | #include <linux/skbuff.h> |
| 20 | #include <linux/proc_fs.h> |
| 21 | #include <linux/vmalloc.h> |
| 22 | #include <linux/stddef.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/random.h> |
| 25 | #include <linux/jhash.h> |
| 26 | #include <linux/err.h> |
| 27 | #include <linux/percpu.h> |
| 28 | #include <linux/moduleparam.h> |
| 29 | #include <linux/notifier.h> |
| 30 | #include <linux/kernel.h> |
| 31 | #include <linux/netdevice.h> |
| 32 | #include <linux/socket.h> |
Al Viro | d7fe0f2 | 2006-12-03 23:15:30 -0500 | [diff] [blame] | 33 | #include <linux/mm.h> |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 34 | #include <linux/nsproxy.h> |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 35 | #include <linux/rculist_nulls.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 36 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 37 | #include <net/netfilter/nf_conntrack.h> |
| 38 | #include <net/netfilter/nf_conntrack_l3proto.h> |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 39 | #include <net/netfilter/nf_conntrack_l4proto.h> |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 40 | #include <net/netfilter/nf_conntrack_expect.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 41 | #include <net/netfilter/nf_conntrack_helper.h> |
Patrick McHardy | 41d73ec | 2013-08-27 08:50:12 +0200 | [diff] [blame] | 42 | #include <net/netfilter/nf_conntrack_seqadj.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 43 | #include <net/netfilter/nf_conntrack_core.h> |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 44 | #include <net/netfilter/nf_conntrack_extend.h> |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 45 | #include <net/netfilter/nf_conntrack_acct.h> |
Pablo Neira Ayuso | a0891aa | 2009-06-13 12:26:29 +0200 | [diff] [blame] | 46 | #include <net/netfilter/nf_conntrack_ecache.h> |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 47 | #include <net/netfilter/nf_conntrack_zones.h> |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 48 | #include <net/netfilter/nf_conntrack_timestamp.h> |
Pablo Neira Ayuso | dd70507 | 2012-02-28 23:36:48 +0100 | [diff] [blame] | 49 | #include <net/netfilter/nf_conntrack_timeout.h> |
Florian Westphal | c539f01 | 2013-01-11 06:30:44 +0000 | [diff] [blame] | 50 | #include <net/netfilter/nf_conntrack_labels.h> |
Patrick McHardy | 48b1de4 | 2013-08-27 08:50:14 +0200 | [diff] [blame] | 51 | #include <net/netfilter/nf_conntrack_synproxy.h> |
Pablo Neira Ayuso | e6a7d3c | 2008-10-14 11:58:31 -0700 | [diff] [blame] | 52 | #include <net/netfilter/nf_nat.h> |
Patrick McHardy | e17b666 | 2008-11-18 12:24:17 +0100 | [diff] [blame] | 53 | #include <net/netfilter/nf_nat_core.h> |
stephen hemminger | 4937636 | 2013-03-16 07:00:28 +0000 | [diff] [blame] | 54 | #include <net/netfilter/nf_nat_helper.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 55 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 56 | #define NF_CONNTRACK_VERSION "0.5.0" |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 57 | |
Patrick McHardy | e17b666 | 2008-11-18 12:24:17 +0100 | [diff] [blame] | 58 | int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct, |
| 59 | enum nf_nat_manip_type manip, |
Patrick McHardy | 3993832 | 2009-08-25 16:07:58 +0200 | [diff] [blame] | 60 | const struct nlattr *attr) __read_mostly; |
Pablo Neira Ayuso | e6a7d3c | 2008-10-14 11:58:31 -0700 | [diff] [blame] | 61 | EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook); |
| 62 | |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 63 | __cacheline_aligned_in_smp spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS]; |
| 64 | EXPORT_SYMBOL_GPL(nf_conntrack_locks); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 65 | |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 66 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(nf_conntrack_expect_lock); |
| 67 | EXPORT_SYMBOL_GPL(nf_conntrack_expect_lock); |
| 68 | |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 69 | static void nf_conntrack_double_unlock(unsigned int h1, unsigned int h2) |
| 70 | { |
| 71 | h1 %= CONNTRACK_LOCKS; |
| 72 | h2 %= CONNTRACK_LOCKS; |
| 73 | spin_unlock(&nf_conntrack_locks[h1]); |
| 74 | if (h1 != h2) |
| 75 | spin_unlock(&nf_conntrack_locks[h2]); |
| 76 | } |
| 77 | |
| 78 | /* return true if we need to recompute hashes (in case hash table was resized) */ |
| 79 | static bool nf_conntrack_double_lock(struct net *net, unsigned int h1, |
| 80 | unsigned int h2, unsigned int sequence) |
| 81 | { |
| 82 | h1 %= CONNTRACK_LOCKS; |
| 83 | h2 %= CONNTRACK_LOCKS; |
| 84 | if (h1 <= h2) { |
| 85 | spin_lock(&nf_conntrack_locks[h1]); |
| 86 | if (h1 != h2) |
| 87 | spin_lock_nested(&nf_conntrack_locks[h2], |
| 88 | SINGLE_DEPTH_NESTING); |
| 89 | } else { |
| 90 | spin_lock(&nf_conntrack_locks[h2]); |
| 91 | spin_lock_nested(&nf_conntrack_locks[h1], |
| 92 | SINGLE_DEPTH_NESTING); |
| 93 | } |
| 94 | if (read_seqcount_retry(&net->ct.generation, sequence)) { |
| 95 | nf_conntrack_double_unlock(h1, h2); |
| 96 | return true; |
| 97 | } |
| 98 | return false; |
| 99 | } |
| 100 | |
| 101 | static void nf_conntrack_all_lock(void) |
| 102 | { |
| 103 | int i; |
| 104 | |
| 105 | for (i = 0; i < CONNTRACK_LOCKS; i++) |
| 106 | spin_lock_nested(&nf_conntrack_locks[i], i); |
| 107 | } |
| 108 | |
| 109 | static void nf_conntrack_all_unlock(void) |
| 110 | { |
| 111 | int i; |
| 112 | |
| 113 | for (i = 0; i < CONNTRACK_LOCKS; i++) |
| 114 | spin_unlock(&nf_conntrack_locks[i]); |
| 115 | } |
| 116 | |
Martin Josefsson | e2b7606 | 2006-11-29 02:35:04 +0100 | [diff] [blame] | 117 | unsigned int nf_conntrack_htable_size __read_mostly; |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 118 | EXPORT_SYMBOL_GPL(nf_conntrack_htable_size); |
| 119 | |
Hagen Paul Pfeifer | e478075 | 2009-02-20 10:47:09 +0100 | [diff] [blame] | 120 | unsigned int nf_conntrack_max __read_mostly; |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 121 | EXPORT_SYMBOL_GPL(nf_conntrack_max); |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 122 | |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 123 | DEFINE_PER_CPU(struct nf_conn, nf_conntrack_untracked); |
| 124 | EXPORT_PER_CPU_SYMBOL(nf_conntrack_untracked); |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 125 | |
Changli Gao | f682cef | 2011-01-05 04:23:23 +0000 | [diff] [blame] | 126 | unsigned int nf_conntrack_hash_rnd __read_mostly; |
Patrick McHardy | 4d4e61c | 2011-12-23 14:00:13 +0100 | [diff] [blame] | 127 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_rnd); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 128 | |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 129 | static u32 hash_conntrack_raw(const struct nf_conntrack_tuple *tuple, u16 zone) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 130 | { |
Patrick McHardy | 0794935 | 2008-01-31 04:40:52 -0800 | [diff] [blame] | 131 | unsigned int n; |
Sami Farin | 9b88790 | 2007-03-14 16:43:00 -0700 | [diff] [blame] | 132 | |
Patrick McHardy | 0794935 | 2008-01-31 04:40:52 -0800 | [diff] [blame] | 133 | /* The direction must be ignored, so we hash everything up to the |
| 134 | * destination ports (which is a multiple of 4) and treat the last |
| 135 | * three bytes manually. |
| 136 | */ |
| 137 | n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32); |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 138 | return jhash2((u32 *)tuple, n, zone ^ nf_conntrack_hash_rnd ^ |
| 139 | (((__force __u16)tuple->dst.u.all << 16) | |
| 140 | tuple->dst.protonum)); |
| 141 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 142 | |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 143 | static u32 __hash_bucket(u32 hash, unsigned int size) |
| 144 | { |
Daniel Borkmann | 8fc54f6 | 2014-08-23 20:58:54 +0200 | [diff] [blame] | 145 | return reciprocal_scale(hash, size); |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 146 | } |
| 147 | |
| 148 | static u32 hash_bucket(u32 hash, const struct net *net) |
| 149 | { |
| 150 | return __hash_bucket(hash, net->ct.htable_size); |
| 151 | } |
| 152 | |
| 153 | static u_int32_t __hash_conntrack(const struct nf_conntrack_tuple *tuple, |
| 154 | u16 zone, unsigned int size) |
| 155 | { |
| 156 | return __hash_bucket(hash_conntrack_raw(tuple, zone), size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 157 | } |
| 158 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 159 | static inline u_int32_t hash_conntrack(const struct net *net, u16 zone, |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 160 | const struct nf_conntrack_tuple *tuple) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 161 | { |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 162 | return __hash_conntrack(tuple, zone, net->ct.htable_size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 163 | } |
| 164 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 165 | bool |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 166 | nf_ct_get_tuple(const struct sk_buff *skb, |
| 167 | unsigned int nhoff, |
| 168 | unsigned int dataoff, |
| 169 | u_int16_t l3num, |
| 170 | u_int8_t protonum, |
| 171 | struct nf_conntrack_tuple *tuple, |
| 172 | const struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 173 | const struct nf_conntrack_l4proto *l4proto) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 174 | { |
Philip Craig | 443a70d | 2008-04-29 03:35:10 -0700 | [diff] [blame] | 175 | memset(tuple, 0, sizeof(*tuple)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 176 | |
| 177 | tuple->src.l3num = l3num; |
| 178 | if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0) |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 179 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 180 | |
| 181 | tuple->dst.protonum = protonum; |
| 182 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; |
| 183 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 184 | return l4proto->pkt_to_tuple(skb, dataoff, tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 185 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 186 | EXPORT_SYMBOL_GPL(nf_ct_get_tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 187 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 188 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
| 189 | u_int16_t l3num, struct nf_conntrack_tuple *tuple) |
Yasuyuki Kozakai | e2a3123 | 2007-07-14 20:45:14 -0700 | [diff] [blame] | 190 | { |
| 191 | struct nf_conntrack_l3proto *l3proto; |
| 192 | struct nf_conntrack_l4proto *l4proto; |
| 193 | unsigned int protoff; |
| 194 | u_int8_t protonum; |
| 195 | int ret; |
| 196 | |
| 197 | rcu_read_lock(); |
| 198 | |
| 199 | l3proto = __nf_ct_l3proto_find(l3num); |
| 200 | ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum); |
| 201 | if (ret != NF_ACCEPT) { |
| 202 | rcu_read_unlock(); |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 203 | return false; |
Yasuyuki Kozakai | e2a3123 | 2007-07-14 20:45:14 -0700 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | l4proto = __nf_ct_l4proto_find(l3num, protonum); |
| 207 | |
| 208 | ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, tuple, |
| 209 | l3proto, l4proto); |
| 210 | |
| 211 | rcu_read_unlock(); |
| 212 | return ret; |
| 213 | } |
| 214 | EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); |
| 215 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 216 | bool |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 217 | nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, |
| 218 | const struct nf_conntrack_tuple *orig, |
| 219 | const struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 220 | const struct nf_conntrack_l4proto *l4proto) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 221 | { |
Philip Craig | 443a70d | 2008-04-29 03:35:10 -0700 | [diff] [blame] | 222 | memset(inverse, 0, sizeof(*inverse)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 223 | |
| 224 | inverse->src.l3num = orig->src.l3num; |
| 225 | if (l3proto->invert_tuple(inverse, orig) == 0) |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 226 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 227 | |
| 228 | inverse->dst.dir = !orig->dst.dir; |
| 229 | |
| 230 | inverse->dst.protonum = orig->dst.protonum; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 231 | return l4proto->invert_tuple(inverse, orig); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 232 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 233 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 234 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 235 | static void |
| 236 | clean_from_lists(struct nf_conn *ct) |
| 237 | { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 238 | pr_debug("clean_from_lists(%p)\n", ct); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 239 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
| 240 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 241 | |
| 242 | /* Destroy all pending expectations */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 243 | nf_ct_remove_expectations(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 244 | } |
| 245 | |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 246 | /* must be called with local_bh_disable */ |
| 247 | static void nf_ct_add_to_dying_list(struct nf_conn *ct) |
| 248 | { |
| 249 | struct ct_pcpu *pcpu; |
| 250 | |
| 251 | /* add this conntrack to the (per cpu) dying list */ |
| 252 | ct->cpu = smp_processor_id(); |
| 253 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); |
| 254 | |
| 255 | spin_lock(&pcpu->lock); |
| 256 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
| 257 | &pcpu->dying); |
| 258 | spin_unlock(&pcpu->lock); |
| 259 | } |
| 260 | |
| 261 | /* must be called with local_bh_disable */ |
| 262 | static void nf_ct_add_to_unconfirmed_list(struct nf_conn *ct) |
| 263 | { |
| 264 | struct ct_pcpu *pcpu; |
| 265 | |
| 266 | /* add this conntrack to the (per cpu) unconfirmed list */ |
| 267 | ct->cpu = smp_processor_id(); |
| 268 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); |
| 269 | |
| 270 | spin_lock(&pcpu->lock); |
| 271 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
| 272 | &pcpu->unconfirmed); |
| 273 | spin_unlock(&pcpu->lock); |
| 274 | } |
| 275 | |
| 276 | /* must be called with local_bh_disable */ |
| 277 | static void nf_ct_del_from_dying_or_unconfirmed_list(struct nf_conn *ct) |
| 278 | { |
| 279 | struct ct_pcpu *pcpu; |
| 280 | |
| 281 | /* We overload first tuple to link into unconfirmed or dying list.*/ |
| 282 | pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu); |
| 283 | |
| 284 | spin_lock(&pcpu->lock); |
| 285 | BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode)); |
| 286 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
| 287 | spin_unlock(&pcpu->lock); |
| 288 | } |
| 289 | |
Pablo Neira Ayuso | 0838aa7 | 2015-07-13 15:11:48 +0200 | [diff] [blame^] | 290 | /* Released via destroy_conntrack() */ |
| 291 | struct nf_conn *nf_ct_tmpl_alloc(struct net *net, u16 zone, gfp_t flags) |
| 292 | { |
| 293 | struct nf_conn *tmpl; |
| 294 | |
| 295 | tmpl = kzalloc(sizeof(struct nf_conn), GFP_KERNEL); |
| 296 | if (tmpl == NULL) |
| 297 | return NULL; |
| 298 | |
| 299 | tmpl->status = IPS_TEMPLATE; |
| 300 | write_pnet(&tmpl->ct_net, net); |
| 301 | |
| 302 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 303 | if (zone) { |
| 304 | struct nf_conntrack_zone *nf_ct_zone; |
| 305 | |
| 306 | nf_ct_zone = nf_ct_ext_add(tmpl, NF_CT_EXT_ZONE, GFP_ATOMIC); |
| 307 | if (!nf_ct_zone) |
| 308 | goto out_free; |
| 309 | nf_ct_zone->id = zone; |
| 310 | } |
| 311 | #endif |
| 312 | atomic_set(&tmpl->ct_general.use, 0); |
| 313 | |
| 314 | return tmpl; |
| 315 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 316 | out_free: |
| 317 | kfree(tmpl); |
| 318 | return NULL; |
| 319 | #endif |
| 320 | } |
| 321 | EXPORT_SYMBOL_GPL(nf_ct_tmpl_alloc); |
| 322 | |
| 323 | static void nf_ct_tmpl_free(struct nf_conn *tmpl) |
| 324 | { |
| 325 | nf_ct_ext_destroy(tmpl); |
| 326 | nf_ct_ext_free(tmpl); |
| 327 | kfree(tmpl); |
| 328 | } |
| 329 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 330 | static void |
| 331 | destroy_conntrack(struct nf_conntrack *nfct) |
| 332 | { |
| 333 | struct nf_conn *ct = (struct nf_conn *)nfct; |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 334 | struct net *net = nf_ct_net(ct); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 335 | struct nf_conntrack_l4proto *l4proto; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 336 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 337 | pr_debug("destroy_conntrack(%p)\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 338 | NF_CT_ASSERT(atomic_read(&nfct->use) == 0); |
| 339 | NF_CT_ASSERT(!timer_pending(&ct->timeout)); |
| 340 | |
Pablo Neira Ayuso | 0838aa7 | 2015-07-13 15:11:48 +0200 | [diff] [blame^] | 341 | if (unlikely(nf_ct_is_template(ct))) { |
| 342 | nf_ct_tmpl_free(ct); |
| 343 | return; |
| 344 | } |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 345 | rcu_read_lock(); |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 346 | l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 347 | if (l4proto && l4proto->destroy) |
| 348 | l4proto->destroy(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 349 | |
Patrick McHardy | 982d9a9 | 2007-02-12 11:14:11 -0800 | [diff] [blame] | 350 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 351 | |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 352 | local_bh_disable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 353 | /* Expectations will have been removed in clean_from_lists, |
| 354 | * except TFTP can create an expectation on the first packet, |
| 355 | * 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] | 356 | * too. |
| 357 | */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 358 | nf_ct_remove_expectations(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 359 | |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 360 | nf_ct_del_from_dying_or_unconfirmed_list(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 361 | |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 362 | NF_CT_STAT_INC(net, delete); |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 363 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 364 | |
| 365 | if (ct->master) |
| 366 | nf_ct_put(ct->master); |
| 367 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 368 | pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 369 | nf_conntrack_free(ct); |
| 370 | } |
| 371 | |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 372 | static void nf_ct_delete_from_lists(struct nf_conn *ct) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 373 | { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 374 | struct net *net = nf_ct_net(ct); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 375 | unsigned int hash, reply_hash; |
| 376 | u16 zone = nf_ct_zone(ct); |
| 377 | unsigned int sequence; |
Patrick McHardy | 5397e97 | 2007-05-19 14:23:52 -0700 | [diff] [blame] | 378 | |
Pablo Neira Ayuso | 9858a3a | 2009-06-13 12:28:22 +0200 | [diff] [blame] | 379 | nf_ct_helper_destroy(ct); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 380 | |
| 381 | local_bh_disable(); |
| 382 | do { |
| 383 | sequence = read_seqcount_begin(&net->ct.generation); |
| 384 | hash = hash_conntrack(net, zone, |
| 385 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
| 386 | reply_hash = hash_conntrack(net, zone, |
| 387 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
| 388 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); |
| 389 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 390 | clean_from_lists(ct); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 391 | nf_conntrack_double_unlock(hash, reply_hash); |
| 392 | |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 393 | nf_ct_add_to_dying_list(ct); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 394 | |
| 395 | NF_CT_STAT_INC(net, delete_list); |
| 396 | local_bh_enable(); |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 397 | } |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 398 | |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 399 | 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] | 400 | { |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 401 | struct nf_conn_tstamp *tstamp; |
| 402 | |
| 403 | tstamp = nf_conn_tstamp_find(ct); |
| 404 | if (tstamp && tstamp->stop == 0) |
Eric Dumazet | d2de875 | 2014-08-22 18:32:09 -0700 | [diff] [blame] | 405 | tstamp->stop = ktime_get_real_ns(); |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 406 | |
Florian Westphal | 9500507 | 2014-06-10 23:12:56 +0200 | [diff] [blame] | 407 | if (nf_ct_is_dying(ct)) |
| 408 | goto delete; |
| 409 | |
| 410 | if (nf_conntrack_event_report(IPCT_DESTROY, ct, |
| 411 | portid, report) < 0) { |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 412 | /* destroy event was not delivered */ |
| 413 | nf_ct_delete_from_lists(ct); |
Florian Westphal | 9500507 | 2014-06-10 23:12:56 +0200 | [diff] [blame] | 414 | nf_conntrack_ecache_delayed_work(nf_ct_net(ct)); |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 415 | return false; |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 416 | } |
Florian Westphal | 9500507 | 2014-06-10 23:12:56 +0200 | [diff] [blame] | 417 | |
| 418 | nf_conntrack_ecache_work(nf_ct_net(ct)); |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 419 | set_bit(IPS_DYING_BIT, &ct->status); |
Florian Westphal | 9500507 | 2014-06-10 23:12:56 +0200 | [diff] [blame] | 420 | delete: |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 421 | nf_ct_delete_from_lists(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 422 | nf_ct_put(ct); |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 423 | return true; |
| 424 | } |
| 425 | EXPORT_SYMBOL_GPL(nf_ct_delete); |
| 426 | |
| 427 | static void death_by_timeout(unsigned long ul_conntrack) |
| 428 | { |
| 429 | nf_ct_delete((struct nf_conn *)ul_conntrack, 0, 0); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 430 | } |
| 431 | |
Andrey Vagin | c6825c0 | 2014-01-29 19:34:14 +0100 | [diff] [blame] | 432 | static inline bool |
| 433 | nf_ct_key_equal(struct nf_conntrack_tuple_hash *h, |
| 434 | const struct nf_conntrack_tuple *tuple, |
| 435 | u16 zone) |
| 436 | { |
| 437 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); |
| 438 | |
| 439 | /* A conntrack can be recreated with the equal tuple, |
| 440 | * so we need to check that the conntrack is confirmed |
| 441 | */ |
| 442 | return nf_ct_tuple_equal(tuple, &h->tuple) && |
| 443 | nf_ct_zone(ct) == zone && |
| 444 | nf_ct_is_confirmed(ct); |
| 445 | } |
| 446 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 447 | /* |
| 448 | * Warning : |
| 449 | * - Caller must take a reference on returned object |
| 450 | * and recheck nf_ct_tuple_equal(tuple, &h->tuple) |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 451 | */ |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 452 | static struct nf_conntrack_tuple_hash * |
| 453 | ____nf_conntrack_find(struct net *net, u16 zone, |
| 454 | const struct nf_conntrack_tuple *tuple, u32 hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 455 | { |
| 456 | struct nf_conntrack_tuple_hash *h; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 457 | struct hlist_nulls_node *n; |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 458 | unsigned int bucket = hash_bucket(hash, net); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 459 | |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 460 | /* Disable BHs the entire time since we normally need to disable them |
| 461 | * at least once for the stats anyway. |
| 462 | */ |
| 463 | local_bh_disable(); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 464 | begin: |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 465 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[bucket], hnnode) { |
Andrey Vagin | c6825c0 | 2014-01-29 19:34:14 +0100 | [diff] [blame] | 466 | if (nf_ct_key_equal(h, tuple, zone)) { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 467 | NF_CT_STAT_INC(net, found); |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 468 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 469 | return h; |
| 470 | } |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 471 | NF_CT_STAT_INC(net, searched); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 472 | } |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 473 | /* |
| 474 | * if the nulls value we got at the end of this lookup is |
| 475 | * not the expected one, we must restart lookup. |
| 476 | * We probably met an item that was moved to another chain. |
| 477 | */ |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 478 | if (get_nulls_value(n) != bucket) { |
Jesper Dangaard Brouer | af740b2 | 2010-04-23 12:34:56 +0200 | [diff] [blame] | 479 | NF_CT_STAT_INC(net, search_restart); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 480 | goto begin; |
Jesper Dangaard Brouer | af740b2 | 2010-04-23 12:34:56 +0200 | [diff] [blame] | 481 | } |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 482 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 483 | |
| 484 | return NULL; |
| 485 | } |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 486 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 487 | /* Find a connection corresponding to a tuple. */ |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 488 | static struct nf_conntrack_tuple_hash * |
| 489 | __nf_conntrack_find_get(struct net *net, u16 zone, |
| 490 | const struct nf_conntrack_tuple *tuple, u32 hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 491 | { |
| 492 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 493 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 494 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 495 | rcu_read_lock(); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 496 | begin: |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 497 | h = ____nf_conntrack_find(net, zone, tuple, hash); |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 498 | if (h) { |
| 499 | ct = nf_ct_tuplehash_to_ctrack(h); |
Patrick McHardy | 8d8890b7 | 2009-06-22 14:14:41 +0200 | [diff] [blame] | 500 | if (unlikely(nf_ct_is_dying(ct) || |
| 501 | !atomic_inc_not_zero(&ct->ct_general.use))) |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 502 | h = NULL; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 503 | else { |
Andrey Vagin | c6825c0 | 2014-01-29 19:34:14 +0100 | [diff] [blame] | 504 | if (unlikely(!nf_ct_key_equal(h, tuple, zone))) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 505 | nf_ct_put(ct); |
| 506 | goto begin; |
| 507 | } |
| 508 | } |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 509 | } |
| 510 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 511 | |
| 512 | return h; |
| 513 | } |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 514 | |
| 515 | struct nf_conntrack_tuple_hash * |
| 516 | nf_conntrack_find_get(struct net *net, u16 zone, |
| 517 | const struct nf_conntrack_tuple *tuple) |
| 518 | { |
| 519 | return __nf_conntrack_find_get(net, zone, tuple, |
| 520 | hash_conntrack_raw(tuple, zone)); |
| 521 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 522 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 523 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 524 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
| 525 | unsigned int hash, |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame] | 526 | unsigned int reply_hash) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 527 | { |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 528 | struct net *net = nf_ct_net(ct); |
| 529 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 530 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 531 | &net->ct.hash[hash]); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 532 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode, |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame] | 533 | &net->ct.hash[reply_hash]); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 534 | } |
| 535 | |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 536 | int |
| 537 | nf_conntrack_hash_check_insert(struct nf_conn *ct) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 538 | { |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 539 | struct net *net = nf_ct_net(ct); |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame] | 540 | unsigned int hash, reply_hash; |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 541 | struct nf_conntrack_tuple_hash *h; |
| 542 | struct hlist_nulls_node *n; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 543 | u16 zone; |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 544 | unsigned int sequence; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 545 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 546 | zone = nf_ct_zone(ct); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 547 | |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 548 | local_bh_disable(); |
| 549 | do { |
| 550 | sequence = read_seqcount_begin(&net->ct.generation); |
| 551 | hash = hash_conntrack(net, zone, |
| 552 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
| 553 | reply_hash = hash_conntrack(net, zone, |
| 554 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
| 555 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 556 | |
| 557 | /* See if there's one in the list already, including reverse */ |
| 558 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode) |
| 559 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
| 560 | &h->tuple) && |
| 561 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) |
| 562 | goto out; |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame] | 563 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[reply_hash], hnnode) |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 564 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
| 565 | &h->tuple) && |
| 566 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) |
| 567 | goto out; |
| 568 | |
| 569 | add_timer(&ct->timeout); |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 570 | smp_wmb(); |
| 571 | /* The caller holds a reference to this object */ |
| 572 | atomic_set(&ct->ct_general.use, 2); |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame] | 573 | __nf_conntrack_hash_insert(ct, hash, reply_hash); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 574 | nf_conntrack_double_unlock(hash, reply_hash); |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 575 | NF_CT_STAT_INC(net, insert); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 576 | local_bh_enable(); |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 577 | return 0; |
| 578 | |
| 579 | out: |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 580 | nf_conntrack_double_unlock(hash, reply_hash); |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 581 | NF_CT_STAT_INC(net, insert_failed); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 582 | local_bh_enable(); |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 583 | return -EEXIST; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 584 | } |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 585 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_check_insert); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 586 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 587 | /* Confirm a connection given skb; places it in hash table */ |
| 588 | int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 589 | __nf_conntrack_confirm(struct sk_buff *skb) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 590 | { |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame] | 591 | unsigned int hash, reply_hash; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 592 | struct nf_conntrack_tuple_hash *h; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 593 | struct nf_conn *ct; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 594 | struct nf_conn_help *help; |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 595 | struct nf_conn_tstamp *tstamp; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 596 | struct hlist_nulls_node *n; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 597 | enum ip_conntrack_info ctinfo; |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 598 | struct net *net; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 599 | u16 zone; |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 600 | unsigned int sequence; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 601 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 602 | ct = nf_ct_get(skb, &ctinfo); |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 603 | net = nf_ct_net(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 604 | |
| 605 | /* ipt_REJECT uses nf_conntrack_attach to attach related |
| 606 | ICMP/TCP RST packets in other direction. Actual packet |
| 607 | which created connection will be IP_CT_NEW or for an |
| 608 | expected connection, IP_CT_RELATED. */ |
| 609 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) |
| 610 | return NF_ACCEPT; |
| 611 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 612 | zone = nf_ct_zone(ct); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 613 | local_bh_disable(); |
| 614 | |
| 615 | do { |
| 616 | sequence = read_seqcount_begin(&net->ct.generation); |
| 617 | /* reuse the hash saved before */ |
| 618 | hash = *(unsigned long *)&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev; |
| 619 | hash = hash_bucket(hash, net); |
| 620 | reply_hash = hash_conntrack(net, zone, |
| 621 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
| 622 | |
| 623 | } while (nf_conntrack_double_lock(net, hash, reply_hash, sequence)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 624 | |
| 625 | /* 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] | 626 | * connections for unconfirmed conns. But packet copies and |
| 627 | * REJECT will give spurious warnings here. |
| 628 | */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 629 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ |
| 630 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 631 | /* No external references means no one else could have |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 632 | * confirmed us. |
| 633 | */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 634 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 635 | pr_debug("Confirming conntrack %p\n", ct); |
Pablo Neira Ayuso | 8ca3f5e | 2014-11-25 00:14:47 +0100 | [diff] [blame] | 636 | /* We have to check the DYING flag after unlink to prevent |
| 637 | * a race against nf_ct_get_next_corpse() possibly called from |
| 638 | * user context, else we insert an already 'dead' hash, blocking |
| 639 | * further use of that particular connection -JM. |
| 640 | */ |
| 641 | nf_ct_del_from_dying_or_unconfirmed_list(ct); |
Joerg Marx | fc35077 | 2010-05-20 15:55:30 +0200 | [diff] [blame] | 642 | |
Pablo Neira Ayuso | 8ca3f5e | 2014-11-25 00:14:47 +0100 | [diff] [blame] | 643 | if (unlikely(nf_ct_is_dying(ct))) |
| 644 | goto out; |
Joerg Marx | fc35077 | 2010-05-20 15:55:30 +0200 | [diff] [blame] | 645 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 646 | /* See if there's one in the list already, including reverse: |
| 647 | NAT could have grabbed it without realizing, since we're |
| 648 | not in the hash. If there is, we lost race. */ |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 649 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 650 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 651 | &h->tuple) && |
| 652 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 653 | goto out; |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame] | 654 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[reply_hash], hnnode) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 655 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 656 | &h->tuple) && |
| 657 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 658 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 659 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 660 | /* Timer relative to confirmation time, not original |
| 661 | setting time, otherwise we'd get timer wrap in |
| 662 | weird delay cases. */ |
| 663 | ct->timeout.expires += jiffies; |
| 664 | add_timer(&ct->timeout); |
| 665 | atomic_inc(&ct->ct_general.use); |
Changli Gao | 45eec34 | 2011-01-18 15:08:13 +0100 | [diff] [blame] | 666 | ct->status |= IPS_CONFIRMED; |
Patrick McHardy | 5c8ec91 | 2009-06-22 14:14:16 +0200 | [diff] [blame] | 667 | |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 668 | /* set conntrack timestamp, if enabled. */ |
| 669 | tstamp = nf_conn_tstamp_find(ct); |
| 670 | if (tstamp) { |
| 671 | if (skb->tstamp.tv64 == 0) |
Joe Perches | e319269 | 2012-06-03 17:41:40 +0000 | [diff] [blame] | 672 | __net_timestamp(skb); |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 673 | |
| 674 | tstamp->start = ktime_to_ns(skb->tstamp); |
| 675 | } |
Patrick McHardy | 5c8ec91 | 2009-06-22 14:14:16 +0200 | [diff] [blame] | 676 | /* Since the lookup is lockless, hash insertion must be done after |
| 677 | * starting the timer and setting the CONFIRMED bit. The RCU barriers |
| 678 | * guarantee that no other CPU can find the conntrack before the above |
| 679 | * stores are visible. |
| 680 | */ |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame] | 681 | __nf_conntrack_hash_insert(ct, hash, reply_hash); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 682 | nf_conntrack_double_unlock(hash, reply_hash); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 683 | NF_CT_STAT_INC(net, insert); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 684 | local_bh_enable(); |
Patrick McHardy | 5c8ec91 | 2009-06-22 14:14:16 +0200 | [diff] [blame] | 685 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 686 | help = nfct_help(ct); |
| 687 | if (help && help->helper) |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 688 | nf_conntrack_event_cache(IPCT_HELPER, ct); |
Pablo Neira Ayuso | 17e6e4e | 2009-06-02 20:08:46 +0200 | [diff] [blame] | 689 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 690 | nf_conntrack_event_cache(master_ct(ct) ? |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 691 | IPCT_RELATED : IPCT_NEW, ct); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 692 | return NF_ACCEPT; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 693 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 694 | out: |
Pablo Neira Ayuso | 8ca3f5e | 2014-11-25 00:14:47 +0100 | [diff] [blame] | 695 | nf_ct_add_to_dying_list(ct); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 696 | nf_conntrack_double_unlock(hash, reply_hash); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 697 | NF_CT_STAT_INC(net, insert_failed); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 698 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 699 | return NF_DROP; |
| 700 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 701 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 702 | |
| 703 | /* Returns true if a connection correspondings to the tuple (required |
| 704 | for NAT). */ |
| 705 | int |
| 706 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, |
| 707 | const struct nf_conn *ignored_conntrack) |
| 708 | { |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 709 | struct net *net = nf_ct_net(ignored_conntrack); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 710 | struct nf_conntrack_tuple_hash *h; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 711 | struct hlist_nulls_node *n; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 712 | struct nf_conn *ct; |
| 713 | u16 zone = nf_ct_zone(ignored_conntrack); |
| 714 | unsigned int hash = hash_conntrack(net, zone, tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 715 | |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 716 | /* Disable BHs the entire time since we need to disable them at |
| 717 | * least once for the stats anyway. |
| 718 | */ |
| 719 | rcu_read_lock_bh(); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 720 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) { |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 721 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 722 | if (ct != ignored_conntrack && |
| 723 | nf_ct_tuple_equal(tuple, &h->tuple) && |
| 724 | nf_ct_zone(ct) == zone) { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 725 | NF_CT_STAT_INC(net, found); |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 726 | rcu_read_unlock_bh(); |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 727 | return 1; |
| 728 | } |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 729 | NF_CT_STAT_INC(net, searched); |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 730 | } |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 731 | rcu_read_unlock_bh(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 732 | |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 733 | return 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 734 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 735 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 736 | |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 737 | #define NF_CT_EVICTION_RANGE 8 |
| 738 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 739 | /* There's a small race here where we may free a just-assured |
| 740 | connection. Too bad: we're in trouble anyway. */ |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 741 | static noinline int early_drop(struct net *net, unsigned int _hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 742 | { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 743 | /* Use oldest entry, which is roughly LRU */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 744 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 745 | struct nf_conn *ct = NULL, *tmp; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 746 | struct hlist_nulls_node *n; |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 747 | unsigned int i = 0, cnt = 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 748 | int dropped = 0; |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 749 | unsigned int hash, sequence; |
| 750 | spinlock_t *lockp; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 751 | |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 752 | local_bh_disable(); |
| 753 | restart: |
| 754 | sequence = read_seqcount_begin(&net->ct.generation); |
| 755 | hash = hash_bucket(_hash, net); |
| 756 | for (; i < net->ct.htable_size; i++) { |
| 757 | lockp = &nf_conntrack_locks[hash % CONNTRACK_LOCKS]; |
| 758 | spin_lock(lockp); |
| 759 | if (read_seqcount_retry(&net->ct.generation, sequence)) { |
| 760 | spin_unlock(lockp); |
| 761 | goto restart; |
| 762 | } |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 763 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], |
| 764 | hnnode) { |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 765 | tmp = nf_ct_tuplehash_to_ctrack(h); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 766 | if (!test_bit(IPS_ASSURED_BIT, &tmp->status) && |
| 767 | !nf_ct_is_dying(tmp) && |
| 768 | atomic_inc_not_zero(&tmp->ct_general.use)) { |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 769 | ct = tmp; |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 770 | break; |
| 771 | } |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 772 | cnt++; |
| 773 | } |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 774 | |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 775 | hash = (hash + 1) % net->ct.htable_size; |
| 776 | spin_unlock(lockp); |
Changli Gao | 5ae27aa2 | 2009-11-05 14:51:31 +0100 | [diff] [blame] | 777 | |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 778 | if (ct || cnt >= NF_CT_EVICTION_RANGE) |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 779 | break; |
Changli Gao | 5ae27aa2 | 2009-11-05 14:51:31 +0100 | [diff] [blame] | 780 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 781 | } |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 782 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 783 | |
| 784 | if (!ct) |
| 785 | return dropped; |
| 786 | |
| 787 | if (del_timer(&ct->timeout)) { |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 788 | if (nf_ct_delete(ct, 0, 0)) { |
Pablo Neira Ayuso | 74138511 | 2012-03-06 01:22:55 +0000 | [diff] [blame] | 789 | dropped = 1; |
| 790 | NF_CT_STAT_INC_ATOMIC(net, early_drop); |
| 791 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 792 | } |
| 793 | nf_ct_put(ct); |
| 794 | return dropped; |
| 795 | } |
| 796 | |
Changli Gao | f682cef | 2011-01-05 04:23:23 +0000 | [diff] [blame] | 797 | void init_nf_conntrack_hash_rnd(void) |
| 798 | { |
| 799 | unsigned int rand; |
| 800 | |
| 801 | /* |
| 802 | * Why not initialize nf_conntrack_rnd in a "init()" function ? |
| 803 | * Because there isn't enough entropy when system initializing, |
| 804 | * and we initialize it as late as possible. |
| 805 | */ |
| 806 | do { |
| 807 | get_random_bytes(&rand, sizeof(rand)); |
| 808 | } while (!rand); |
| 809 | cmpxchg(&nf_conntrack_hash_rnd, 0, rand); |
| 810 | } |
| 811 | |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 812 | static struct nf_conn * |
| 813 | __nf_conntrack_alloc(struct net *net, u16 zone, |
| 814 | const struct nf_conntrack_tuple *orig, |
| 815 | const struct nf_conntrack_tuple *repl, |
| 816 | gfp_t gfp, u32 hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 817 | { |
Julia Lawall | cd7fcbf | 2009-01-12 00:06:08 +0000 | [diff] [blame] | 818 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 819 | |
Changli Gao | b239096 | 2010-09-16 19:55:03 +0200 | [diff] [blame] | 820 | if (unlikely(!nf_conntrack_hash_rnd)) { |
Changli Gao | f682cef | 2011-01-05 04:23:23 +0000 | [diff] [blame] | 821 | init_nf_conntrack_hash_rnd(); |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 822 | /* recompute the hash as nf_conntrack_hash_rnd is initialized */ |
| 823 | hash = hash_conntrack_raw(orig, zone); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 824 | } |
| 825 | |
Pablo Neira Ayuso | 5251e2d | 2006-09-20 12:01:06 -0700 | [diff] [blame] | 826 | /* We don't want any race condition at early drop stage */ |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 827 | atomic_inc(&net->ct.count); |
Pablo Neira Ayuso | 5251e2d | 2006-09-20 12:01:06 -0700 | [diff] [blame] | 828 | |
Patrick McHardy | 76eb946 | 2008-01-31 04:41:44 -0800 | [diff] [blame] | 829 | if (nf_conntrack_max && |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 830 | unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 831 | if (!early_drop(net, hash)) { |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 832 | atomic_dec(&net->ct.count); |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 833 | net_warn_ratelimited("nf_conntrack: table full, dropping packet\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 834 | return ERR_PTR(-ENOMEM); |
| 835 | } |
| 836 | } |
| 837 | |
Eric Dumazet | 941297f | 2009-07-16 14:03:40 +0200 | [diff] [blame] | 838 | /* |
| 839 | * Do not use kmem_cache_zalloc(), as this cache uses |
| 840 | * SLAB_DESTROY_BY_RCU. |
| 841 | */ |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 842 | ct = kmem_cache_alloc(net->ct.nf_conntrack_cachep, gfp); |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 843 | if (ct == NULL) { |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 844 | atomic_dec(&net->ct.count); |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 845 | return ERR_PTR(-ENOMEM); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 846 | } |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 847 | spin_lock_init(&ct->lock); |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 848 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
Eric Dumazet | 941297f | 2009-07-16 14:03:40 +0200 | [diff] [blame] | 849 | ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL; |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 850 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 851 | /* save hash for reusing when confirming */ |
| 852 | *(unsigned long *)(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev) = hash; |
Florian Westphal | c41884c | 2014-11-24 15:25:57 +0100 | [diff] [blame] | 853 | ct->status = 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 854 | /* Don't set timer yet: wait for confirmation */ |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 855 | setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct); |
Eric Dumazet | c2d9ba9 | 2010-06-01 06:51:19 +0000 | [diff] [blame] | 856 | write_pnet(&ct->ct_net, net); |
Florian Westphal | c41884c | 2014-11-24 15:25:57 +0100 | [diff] [blame] | 857 | memset(&ct->__nfct_init_offset[0], 0, |
| 858 | offsetof(struct nf_conn, proto) - |
| 859 | offsetof(struct nf_conn, __nfct_init_offset[0])); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 860 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 861 | if (zone) { |
| 862 | struct nf_conntrack_zone *nf_ct_zone; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 863 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 864 | nf_ct_zone = nf_ct_ext_add(ct, NF_CT_EXT_ZONE, GFP_ATOMIC); |
| 865 | if (!nf_ct_zone) |
| 866 | goto out_free; |
| 867 | nf_ct_zone->id = zone; |
| 868 | } |
| 869 | #endif |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 870 | /* Because we use RCU lookups, we set ct_general.use to zero before |
| 871 | * this is inserted in any list. |
Eric Dumazet | 941297f | 2009-07-16 14:03:40 +0200 | [diff] [blame] | 872 | */ |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 873 | atomic_set(&ct->ct_general.use, 0); |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 874 | return ct; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 875 | |
| 876 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 877 | out_free: |
Pablo Neira Ayuso | d96fc65 | 2012-04-03 16:45:54 +0200 | [diff] [blame] | 878 | atomic_dec(&net->ct.count); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 879 | kmem_cache_free(net->ct.nf_conntrack_cachep, ct); |
| 880 | return ERR_PTR(-ENOMEM); |
| 881 | #endif |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 882 | } |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 883 | |
| 884 | struct nf_conn *nf_conntrack_alloc(struct net *net, u16 zone, |
| 885 | const struct nf_conntrack_tuple *orig, |
| 886 | const struct nf_conntrack_tuple *repl, |
| 887 | gfp_t gfp) |
| 888 | { |
| 889 | return __nf_conntrack_alloc(net, zone, orig, repl, gfp, 0); |
| 890 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 891 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 892 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 893 | void nf_conntrack_free(struct nf_conn *ct) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 894 | { |
Eric Dumazet | 1d45209 | 2009-03-24 14:26:50 +0100 | [diff] [blame] | 895 | struct net *net = nf_ct_net(ct); |
| 896 | |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 897 | /* A freed object has refcnt == 0, that's |
| 898 | * the golden rule for SLAB_DESTROY_BY_RCU |
| 899 | */ |
| 900 | NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 0); |
| 901 | |
Patrick McHardy | ceeff75 | 2008-06-11 17:51:10 -0700 | [diff] [blame] | 902 | nf_ct_ext_destroy(ct); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 903 | nf_ct_ext_free(ct); |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 904 | kmem_cache_free(net->ct.nf_conntrack_cachep, ct); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 905 | smp_mb__before_atomic(); |
Pablo Neira Ayuso | 0c3c6c0 | 2013-11-18 12:53:59 +0100 | [diff] [blame] | 906 | atomic_dec(&net->ct.count); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 907 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 908 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 909 | |
Florian Westphal | c539f01 | 2013-01-11 06:30:44 +0000 | [diff] [blame] | 910 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 911 | /* Allocate a new conntrack: we return -ENOMEM if classification |
| 912 | failed due to stress. Otherwise it really is unclassifiable. */ |
| 913 | static struct nf_conntrack_tuple_hash * |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 914 | init_conntrack(struct net *net, struct nf_conn *tmpl, |
Alexey Dobriyan | 5a1fb39 | 2008-10-08 11:35:02 +0200 | [diff] [blame] | 915 | const struct nf_conntrack_tuple *tuple, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 916 | struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 917 | struct nf_conntrack_l4proto *l4proto, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 918 | struct sk_buff *skb, |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 919 | unsigned int dataoff, u32 hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 920 | { |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 921 | struct nf_conn *ct; |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 922 | struct nf_conn_help *help; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 923 | struct nf_conntrack_tuple repl_tuple; |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 924 | struct nf_conntrack_ecache *ecache; |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 925 | struct nf_conntrack_expect *exp = NULL; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 926 | u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE; |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 927 | struct nf_conn_timeout *timeout_ext; |
| 928 | unsigned int *timeouts; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 929 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 930 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 931 | pr_debug("Can't invert tuple.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 932 | return NULL; |
| 933 | } |
| 934 | |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 935 | ct = __nf_conntrack_alloc(net, zone, tuple, &repl_tuple, GFP_ATOMIC, |
| 936 | hash); |
Joe Perches | 0a9ee81 | 2011-08-29 14:17:25 -0700 | [diff] [blame] | 937 | if (IS_ERR(ct)) |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 938 | return (struct nf_conntrack_tuple_hash *)ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 939 | |
Patrick McHardy | 48b1de4 | 2013-08-27 08:50:14 +0200 | [diff] [blame] | 940 | if (tmpl && nfct_synproxy(tmpl)) { |
| 941 | nfct_seqadj_ext_add(ct); |
| 942 | nfct_synproxy_ext_add(ct); |
| 943 | } |
| 944 | |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 945 | timeout_ext = tmpl ? nf_ct_timeout_find(tmpl) : NULL; |
| 946 | if (timeout_ext) |
| 947 | timeouts = NF_CT_TIMEOUT_EXT_DATA(timeout_ext); |
| 948 | else |
| 949 | timeouts = l4proto->get_timeouts(net); |
| 950 | |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 951 | if (!l4proto->new(ct, skb, dataoff, timeouts)) { |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 952 | nf_conntrack_free(ct); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 953 | pr_debug("init conntrack: can't track with proto module\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 954 | return NULL; |
| 955 | } |
| 956 | |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 957 | if (timeout_ext) |
| 958 | nf_ct_timeout_ext_add(ct, timeout_ext->timeout, GFP_ATOMIC); |
| 959 | |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 960 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 961 | nf_ct_tstamp_ext_add(ct, GFP_ATOMIC); |
Florian Westphal | c539f01 | 2013-01-11 06:30:44 +0000 | [diff] [blame] | 962 | nf_ct_labels_ext_add(ct); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 963 | |
| 964 | ecache = tmpl ? nf_ct_ecache_find(tmpl) : NULL; |
| 965 | nf_ct_ecache_ext_add(ct, ecache ? ecache->ctmask : 0, |
| 966 | ecache ? ecache->expmask : 0, |
| 967 | GFP_ATOMIC); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 968 | |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 969 | local_bh_disable(); |
| 970 | if (net->ct.expect_count) { |
| 971 | spin_lock(&nf_conntrack_expect_lock); |
| 972 | exp = nf_ct_find_expectation(net, zone, tuple); |
| 973 | if (exp) { |
| 974 | pr_debug("conntrack: expectation arrives ct=%p exp=%p\n", |
| 975 | ct, exp); |
| 976 | /* Welcome, Mr. Bond. We've been expecting you... */ |
| 977 | __set_bit(IPS_EXPECTED_BIT, &ct->status); |
| 978 | /* exp->master safe, refcnt bumped in nf_ct_find_expectation */ |
| 979 | ct->master = exp->master; |
| 980 | if (exp->helper) { |
| 981 | help = nf_ct_helper_ext_add(ct, exp->helper, |
| 982 | GFP_ATOMIC); |
| 983 | if (help) |
| 984 | rcu_assign_pointer(help->helper, exp->helper); |
| 985 | } |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 986 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 987 | #ifdef CONFIG_NF_CONNTRACK_MARK |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 988 | ct->mark = exp->master->mark; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 989 | #endif |
James Morris | 7c9728c | 2006-06-09 00:31:46 -0700 | [diff] [blame] | 990 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 991 | ct->secmark = exp->master->secmark; |
James Morris | 7c9728c | 2006-06-09 00:31:46 -0700 | [diff] [blame] | 992 | #endif |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 993 | NF_CT_STAT_INC(net, expect_new); |
| 994 | } |
| 995 | spin_unlock(&nf_conntrack_expect_lock); |
| 996 | } |
| 997 | if (!exp) { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 998 | __nf_ct_try_assign_helper(ct, tmpl, GFP_ATOMIC); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 999 | NF_CT_STAT_INC(net, new); |
Yasuyuki Kozakai | 22e7410 | 2006-11-27 10:25:59 -0800 | [diff] [blame] | 1000 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1001 | |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 1002 | /* Now it is inserted into the unconfirmed list, bump refcount */ |
| 1003 | nf_conntrack_get(&ct->ct_general); |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1004 | nf_ct_add_to_unconfirmed_list(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1005 | |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 1006 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1007 | |
| 1008 | if (exp) { |
| 1009 | if (exp->expectfn) |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 1010 | exp->expectfn(ct, exp); |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1011 | nf_ct_expect_put(exp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1012 | } |
| 1013 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 1014 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1015 | } |
| 1016 | |
| 1017 | /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ |
| 1018 | static inline struct nf_conn * |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1019 | resolve_normal_ct(struct net *net, struct nf_conn *tmpl, |
Alexey Dobriyan | a702a65 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 1020 | struct sk_buff *skb, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1021 | unsigned int dataoff, |
| 1022 | u_int16_t l3num, |
| 1023 | u_int8_t protonum, |
| 1024 | struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 1025 | struct nf_conntrack_l4proto *l4proto, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1026 | int *set_reply, |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1027 | enum ip_conntrack_info *ctinfo) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1028 | { |
| 1029 | struct nf_conntrack_tuple tuple; |
| 1030 | struct nf_conntrack_tuple_hash *h; |
| 1031 | struct nf_conn *ct; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1032 | u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE; |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 1033 | u32 hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1034 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1035 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1036 | dataoff, l3num, protonum, &tuple, l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 1037 | l4proto)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1038 | pr_debug("resolve_normal_ct: Can't get tuple\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1039 | return NULL; |
| 1040 | } |
| 1041 | |
| 1042 | /* look for tuple match */ |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 1043 | hash = hash_conntrack_raw(&tuple, zone); |
| 1044 | h = __nf_conntrack_find_get(net, zone, &tuple, hash); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1045 | if (!h) { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1046 | h = init_conntrack(net, tmpl, &tuple, l3proto, l4proto, |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1047 | skb, dataoff, hash); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1048 | if (!h) |
| 1049 | return NULL; |
| 1050 | if (IS_ERR(h)) |
| 1051 | return (void *)h; |
| 1052 | } |
| 1053 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 1054 | |
| 1055 | /* It exists; we have (non-exclusive) reference. */ |
| 1056 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 1057 | *ctinfo = IP_CT_ESTABLISHED_REPLY; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1058 | /* Please set reply bit if this packet OK */ |
| 1059 | *set_reply = 1; |
| 1060 | } else { |
| 1061 | /* Once we've had two way comms, always ESTABLISHED. */ |
| 1062 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1063 | pr_debug("nf_conntrack_in: normal packet for %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1064 | *ctinfo = IP_CT_ESTABLISHED; |
| 1065 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1066 | pr_debug("nf_conntrack_in: related packet for %p\n", |
| 1067 | ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1068 | *ctinfo = IP_CT_RELATED; |
| 1069 | } else { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1070 | pr_debug("nf_conntrack_in: new packet for %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1071 | *ctinfo = IP_CT_NEW; |
| 1072 | } |
| 1073 | *set_reply = 0; |
| 1074 | } |
| 1075 | skb->nfct = &ct->ct_general; |
| 1076 | skb->nfctinfo = *ctinfo; |
| 1077 | return ct; |
| 1078 | } |
| 1079 | |
| 1080 | unsigned int |
Alexey Dobriyan | a702a65 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 1081 | nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, |
| 1082 | struct sk_buff *skb) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1083 | { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1084 | struct nf_conn *ct, *tmpl = NULL; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1085 | enum ip_conntrack_info ctinfo; |
| 1086 | struct nf_conntrack_l3proto *l3proto; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 1087 | struct nf_conntrack_l4proto *l4proto; |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 1088 | unsigned int *timeouts; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1089 | unsigned int dataoff; |
| 1090 | u_int8_t protonum; |
| 1091 | int set_reply = 0; |
| 1092 | int ret; |
| 1093 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1094 | if (skb->nfct) { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1095 | /* Previously seen (loopback or untracked)? Ignore. */ |
| 1096 | tmpl = (struct nf_conn *)skb->nfct; |
| 1097 | if (!nf_ct_is_template(tmpl)) { |
| 1098 | NF_CT_STAT_INC_ATOMIC(net, ignore); |
| 1099 | return NF_ACCEPT; |
| 1100 | } |
| 1101 | skb->nfct = NULL; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1102 | } |
| 1103 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 1104 | /* rcu_read_lock()ed by nf_hook_slow */ |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 1105 | l3proto = __nf_ct_l3proto_find(pf); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1106 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
Yasuyuki Kozakai | ffc3069 | 2007-07-14 20:44:50 -0700 | [diff] [blame] | 1107 | &dataoff, &protonum); |
| 1108 | if (ret <= 0) { |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1109 | pr_debug("not prepared to track yet or error occurred\n"); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1110 | NF_CT_STAT_INC_ATOMIC(net, error); |
| 1111 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1112 | ret = -ret; |
| 1113 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1114 | } |
| 1115 | |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 1116 | l4proto = __nf_ct_l4proto_find(pf, protonum); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1117 | |
| 1118 | /* It may be an special packet, error, unclean... |
| 1119 | * inverse of the return code tells to the netfilter |
| 1120 | * core what to do with the packet. */ |
Alexey Dobriyan | 74c51a1 | 2008-10-08 11:35:05 +0200 | [diff] [blame] | 1121 | if (l4proto->error != NULL) { |
Patrick McHardy | 8fea97e | 2010-02-15 17:45:08 +0100 | [diff] [blame] | 1122 | ret = l4proto->error(net, tmpl, skb, dataoff, &ctinfo, |
| 1123 | pf, hooknum); |
Alexey Dobriyan | 74c51a1 | 2008-10-08 11:35:05 +0200 | [diff] [blame] | 1124 | if (ret <= 0) { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1125 | NF_CT_STAT_INC_ATOMIC(net, error); |
| 1126 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1127 | ret = -ret; |
| 1128 | goto out; |
Alexey Dobriyan | 74c51a1 | 2008-10-08 11:35:05 +0200 | [diff] [blame] | 1129 | } |
Pablo Neira Ayuso | 88ed01d | 2011-06-02 15:08:45 +0200 | [diff] [blame] | 1130 | /* ICMP[v6] protocol trackers may assign one conntrack. */ |
| 1131 | if (skb->nfct) |
| 1132 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1133 | } |
| 1134 | |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1135 | ct = resolve_normal_ct(net, tmpl, skb, dataoff, pf, protonum, |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1136 | l3proto, l4proto, &set_reply, &ctinfo); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1137 | if (!ct) { |
| 1138 | /* Not valid part of a connection */ |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1139 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1140 | ret = NF_ACCEPT; |
| 1141 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1142 | } |
| 1143 | |
| 1144 | if (IS_ERR(ct)) { |
| 1145 | /* Too stressed to deal. */ |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1146 | NF_CT_STAT_INC_ATOMIC(net, drop); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1147 | ret = NF_DROP; |
| 1148 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1149 | } |
| 1150 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1151 | NF_CT_ASSERT(skb->nfct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1152 | |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1153 | /* Decide what timeout policy we want to apply to this flow. */ |
Pablo Neira Ayuso | 84b5ee9 | 2012-08-28 00:53:15 +0000 | [diff] [blame] | 1154 | timeouts = nf_ct_timeout_lookup(net, ct, l4proto); |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1155 | |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 1156 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum, timeouts); |
Christoph Paasch | ec8d540 | 2009-03-16 15:51:29 +0100 | [diff] [blame] | 1157 | if (ret <= 0) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1158 | /* Invalid: inverse of the return code tells |
| 1159 | * the netfilter core what to do */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1160 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1161 | nf_conntrack_put(skb->nfct); |
| 1162 | skb->nfct = NULL; |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1163 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Pablo Neira Ayuso | 7d1e045 | 2009-02-24 14:48:01 +0100 | [diff] [blame] | 1164 | if (ret == -NF_DROP) |
| 1165 | NF_CT_STAT_INC_ATOMIC(net, drop); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1166 | ret = -ret; |
| 1167 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1168 | } |
| 1169 | |
| 1170 | 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] | 1171 | nf_conntrack_event_cache(IPCT_REPLY, ct); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1172 | out: |
Pablo Neira Ayuso | c317428 | 2011-02-09 08:08:20 +0100 | [diff] [blame] | 1173 | if (tmpl) { |
| 1174 | /* Special case: we have to repeat this hook, assign the |
| 1175 | * template again to this packet. We assume that this packet |
| 1176 | * has no conntrack assigned. This is used by nf_ct_tcp. */ |
| 1177 | if (ret == NF_REPEAT) |
| 1178 | skb->nfct = (struct nf_conntrack *)tmpl; |
| 1179 | else |
| 1180 | nf_ct_put(tmpl); |
| 1181 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1182 | |
| 1183 | return ret; |
| 1184 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1185 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1186 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 1187 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
| 1188 | const struct nf_conntrack_tuple *orig) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1189 | { |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 1190 | bool ret; |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 1191 | |
| 1192 | rcu_read_lock(); |
| 1193 | ret = nf_ct_invert_tuple(inverse, orig, |
| 1194 | __nf_ct_l3proto_find(orig->src.l3num), |
| 1195 | __nf_ct_l4proto_find(orig->src.l3num, |
| 1196 | orig->dst.protonum)); |
| 1197 | rcu_read_unlock(); |
| 1198 | return ret; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1199 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1200 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1201 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1202 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
| 1203 | implicitly racy: see __nf_conntrack_confirm */ |
| 1204 | void nf_conntrack_alter_reply(struct nf_conn *ct, |
| 1205 | const struct nf_conntrack_tuple *newreply) |
| 1206 | { |
| 1207 | struct nf_conn_help *help = nfct_help(ct); |
| 1208 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1209 | /* Should be unconfirmed, so not in hash table yet */ |
| 1210 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
| 1211 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1212 | pr_debug("Altering reply tuple of %p to ", ct); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1213 | nf_ct_dump_tuple(newreply); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1214 | |
| 1215 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; |
Patrick McHardy | ef1a5a5 | 2008-04-14 11:21:01 +0200 | [diff] [blame] | 1216 | if (ct->master || (help && !hlist_empty(&help->expectations))) |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 1217 | return; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 1218 | |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 1219 | rcu_read_lock(); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1220 | __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC); |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 1221 | rcu_read_unlock(); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1222 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1223 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1224 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1225 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
| 1226 | void __nf_ct_refresh_acct(struct nf_conn *ct, |
| 1227 | enum ip_conntrack_info ctinfo, |
| 1228 | const struct sk_buff *skb, |
| 1229 | unsigned long extra_jiffies, |
| 1230 | int do_acct) |
| 1231 | { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1232 | NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct); |
| 1233 | NF_CT_ASSERT(skb); |
| 1234 | |
Eric Leblond | 997ae83 | 2006-05-29 18:24:20 -0700 | [diff] [blame] | 1235 | /* Only update if this is not a fixed timeout */ |
Patrick McHardy | 47d9504 | 2008-01-31 04:36:31 -0800 | [diff] [blame] | 1236 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
| 1237 | goto acct; |
Eric Leblond | 997ae83 | 2006-05-29 18:24:20 -0700 | [diff] [blame] | 1238 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1239 | /* If not in hash table, timer will not be active yet */ |
| 1240 | if (!nf_ct_is_confirmed(ct)) { |
| 1241 | ct->timeout.expires = extra_jiffies; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1242 | } else { |
Martin Josefsson | be00c8e | 2006-11-29 02:35:12 +0100 | [diff] [blame] | 1243 | unsigned long newtime = jiffies + extra_jiffies; |
| 1244 | |
| 1245 | /* Only update the timeout if the new timeout is at least |
| 1246 | HZ jiffies from the old timeout. Need del_timer for race |
| 1247 | avoidance (may already be dying). */ |
Patrick McHardy | 65cb9fd | 2009-06-13 12:21:49 +0200 | [diff] [blame] | 1248 | if (newtime - ct->timeout.expires >= HZ) |
| 1249 | mod_timer_pending(&ct->timeout, newtime); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1250 | } |
| 1251 | |
Patrick McHardy | 47d9504 | 2008-01-31 04:36:31 -0800 | [diff] [blame] | 1252 | acct: |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1253 | if (do_acct) { |
Holger Eitzenberger | f7b13e4 | 2013-09-26 17:31:51 +0200 | [diff] [blame] | 1254 | struct nf_conn_acct *acct; |
Martin Josefsson | 3ffd5ee | 2006-11-29 02:35:10 +0100 | [diff] [blame] | 1255 | |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1256 | acct = nf_conn_acct_find(ct); |
| 1257 | if (acct) { |
Holger Eitzenberger | f7b13e4 | 2013-09-26 17:31:51 +0200 | [diff] [blame] | 1258 | struct nf_conn_counter *counter = acct->counter; |
| 1259 | |
| 1260 | atomic64_inc(&counter[CTINFO2DIR(ctinfo)].packets); |
| 1261 | atomic64_add(skb->len, &counter[CTINFO2DIR(ctinfo)].bytes); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1262 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1263 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1264 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1265 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1266 | |
David S. Miller | 4c88949 | 2008-07-14 20:22:38 -0700 | [diff] [blame] | 1267 | bool __nf_ct_kill_acct(struct nf_conn *ct, |
| 1268 | enum ip_conntrack_info ctinfo, |
| 1269 | const struct sk_buff *skb, |
| 1270 | int do_acct) |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 1271 | { |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 1272 | if (do_acct) { |
Holger Eitzenberger | f7b13e4 | 2013-09-26 17:31:51 +0200 | [diff] [blame] | 1273 | struct nf_conn_acct *acct; |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1274 | |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1275 | acct = nf_conn_acct_find(ct); |
| 1276 | if (acct) { |
Holger Eitzenberger | f7b13e4 | 2013-09-26 17:31:51 +0200 | [diff] [blame] | 1277 | struct nf_conn_counter *counter = acct->counter; |
| 1278 | |
| 1279 | atomic64_inc(&counter[CTINFO2DIR(ctinfo)].packets); |
Eric Dumazet | b3e0bfa | 2011-12-14 14:45:20 +0100 | [diff] [blame] | 1280 | atomic64_add(skb->len - skb_network_offset(skb), |
Holger Eitzenberger | f7b13e4 | 2013-09-26 17:31:51 +0200 | [diff] [blame] | 1281 | &counter[CTINFO2DIR(ctinfo)].bytes); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1282 | } |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 1283 | } |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1284 | |
David S. Miller | 4c88949 | 2008-07-14 20:22:38 -0700 | [diff] [blame] | 1285 | if (del_timer(&ct->timeout)) { |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 1286 | ct->timeout.function((unsigned long)ct); |
David S. Miller | 4c88949 | 2008-07-14 20:22:38 -0700 | [diff] [blame] | 1287 | return true; |
| 1288 | } |
| 1289 | return false; |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 1290 | } |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 1291 | EXPORT_SYMBOL_GPL(__nf_ct_kill_acct); |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 1292 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1293 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 1294 | static struct nf_ct_ext_type nf_ct_zone_extend __read_mostly = { |
| 1295 | .len = sizeof(struct nf_conntrack_zone), |
| 1296 | .align = __alignof__(struct nf_conntrack_zone), |
| 1297 | .id = NF_CT_EXT_ZONE, |
| 1298 | }; |
| 1299 | #endif |
| 1300 | |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 1301 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1302 | |
| 1303 | #include <linux/netfilter/nfnetlink.h> |
| 1304 | #include <linux/netfilter/nfnetlink_conntrack.h> |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1305 | #include <linux/mutex.h> |
| 1306 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1307 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
| 1308 | * in ip_conntrack_core, since we don't want the protocols to autoload |
| 1309 | * or depend on ctnetlink */ |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 1310 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1311 | const struct nf_conntrack_tuple *tuple) |
| 1312 | { |
David S. Miller | bae65be | 2012-04-01 18:58:28 -0400 | [diff] [blame] | 1313 | if (nla_put_be16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port) || |
| 1314 | nla_put_be16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port)) |
| 1315 | goto nla_put_failure; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1316 | return 0; |
| 1317 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 1318 | nla_put_failure: |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1319 | return -1; |
| 1320 | } |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 1321 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1322 | |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 1323 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
| 1324 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, |
| 1325 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1326 | }; |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 1327 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1328 | |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 1329 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1330 | struct nf_conntrack_tuple *t) |
| 1331 | { |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 1332 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1333 | return -EINVAL; |
| 1334 | |
Patrick McHardy | 77236b6 | 2007-12-17 22:29:45 -0800 | [diff] [blame] | 1335 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
| 1336 | 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] | 1337 | |
| 1338 | return 0; |
| 1339 | } |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 1340 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
Holger Eitzenberger | 5c0de29 | 2009-03-25 21:52:17 +0100 | [diff] [blame] | 1341 | |
| 1342 | int nf_ct_port_nlattr_tuple_size(void) |
| 1343 | { |
| 1344 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); |
| 1345 | } |
| 1346 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1347 | #endif |
| 1348 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1349 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
Patrick McHardy | 312a0c16 | 2013-07-28 22:54:08 +0200 | [diff] [blame] | 1350 | 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] | 1351 | { |
| 1352 | struct nf_conn *ct; |
| 1353 | enum ip_conntrack_info ctinfo; |
| 1354 | |
| 1355 | /* This ICMP is in reverse direction to the packet which caused it */ |
| 1356 | ct = nf_ct_get(skb, &ctinfo); |
| 1357 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 1358 | ctinfo = IP_CT_RELATED_REPLY; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1359 | else |
| 1360 | ctinfo = IP_CT_RELATED; |
| 1361 | |
| 1362 | /* Attach to new skbuff, and increment count */ |
| 1363 | nskb->nfct = &ct->ct_general; |
| 1364 | nskb->nfctinfo = ctinfo; |
| 1365 | nf_conntrack_get(nskb->nfct); |
| 1366 | } |
| 1367 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1368 | /* Bring out ya dead! */ |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1369 | static struct nf_conn * |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1370 | 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] | 1371 | void *data, unsigned int *bucket) |
| 1372 | { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1373 | struct nf_conntrack_tuple_hash *h; |
| 1374 | struct nf_conn *ct; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1375 | struct hlist_nulls_node *n; |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1376 | int cpu; |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1377 | spinlock_t *lockp; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1378 | |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1379 | for (; *bucket < net->ct.htable_size; (*bucket)++) { |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1380 | lockp = &nf_conntrack_locks[*bucket % CONNTRACK_LOCKS]; |
| 1381 | local_bh_disable(); |
| 1382 | spin_lock(lockp); |
| 1383 | if (*bucket < net->ct.htable_size) { |
| 1384 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) { |
| 1385 | if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
| 1386 | continue; |
| 1387 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 1388 | if (iter(ct, data)) |
| 1389 | goto found; |
| 1390 | } |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1391 | } |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1392 | spin_unlock(lockp); |
| 1393 | local_bh_enable(); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1394 | } |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1395 | |
| 1396 | for_each_possible_cpu(cpu) { |
| 1397 | struct ct_pcpu *pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu); |
| 1398 | |
| 1399 | spin_lock_bh(&pcpu->lock); |
| 1400 | hlist_nulls_for_each_entry(h, n, &pcpu->unconfirmed, hnnode) { |
| 1401 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 1402 | if (iter(ct, data)) |
| 1403 | set_bit(IPS_DYING_BIT, &ct->status); |
| 1404 | } |
| 1405 | spin_unlock_bh(&pcpu->lock); |
| 1406 | } |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1407 | return NULL; |
| 1408 | found: |
Martin Josefsson | c073e3f | 2006-10-30 15:13:58 -0800 | [diff] [blame] | 1409 | atomic_inc(&ct->ct_general.use); |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1410 | spin_unlock(lockp); |
| 1411 | local_bh_enable(); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1412 | return ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1413 | } |
| 1414 | |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1415 | void nf_ct_iterate_cleanup(struct net *net, |
| 1416 | int (*iter)(struct nf_conn *i, void *data), |
Florian Westphal | c655bc6 | 2013-07-29 15:41:55 +0200 | [diff] [blame] | 1417 | void *data, u32 portid, int report) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1418 | { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1419 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1420 | unsigned int bucket = 0; |
| 1421 | |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1422 | while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1423 | /* Time to push up daises... */ |
| 1424 | if (del_timer(&ct->timeout)) |
Florian Westphal | c655bc6 | 2013-07-29 15:41:55 +0200 | [diff] [blame] | 1425 | nf_ct_delete(ct, portid, report); |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 1426 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1427 | /* ... else the timer will get him soon. */ |
| 1428 | |
| 1429 | nf_ct_put(ct); |
| 1430 | } |
| 1431 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1432 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1433 | |
Pablo Neira Ayuso | 274d383 | 2009-06-02 20:08:38 +0200 | [diff] [blame] | 1434 | static int kill_all(struct nf_conn *i, void *data) |
| 1435 | { |
| 1436 | return 1; |
| 1437 | } |
| 1438 | |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1439 | void nf_ct_free_hashtable(void *hash, unsigned int size) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1440 | { |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1441 | if (is_vmalloc_addr(hash)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1442 | vfree(hash); |
| 1443 | else |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1444 | free_pages((unsigned long)hash, |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1445 | get_order(sizeof(struct hlist_head) * size)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1446 | } |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1447 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1448 | |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1449 | static int untrack_refs(void) |
| 1450 | { |
| 1451 | int cnt = 0, cpu; |
| 1452 | |
| 1453 | for_each_possible_cpu(cpu) { |
| 1454 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); |
| 1455 | |
| 1456 | cnt += atomic_read(&ct->ct_general.use) - 1; |
| 1457 | } |
| 1458 | return cnt; |
| 1459 | } |
| 1460 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1461 | void nf_conntrack_cleanup_start(void) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1462 | { |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1463 | RCU_INIT_POINTER(ip_ct_attach, NULL); |
| 1464 | } |
| 1465 | |
| 1466 | void nf_conntrack_cleanup_end(void) |
| 1467 | { |
| 1468 | RCU_INIT_POINTER(nf_ct_destroy, NULL); |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1469 | while (untrack_refs() > 0) |
Patrick McHardy | 9edd7ca | 2010-02-08 11:16:26 -0800 | [diff] [blame] | 1470 | schedule(); |
| 1471 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1472 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 1473 | nf_ct_extend_unregister(&nf_ct_zone_extend); |
| 1474 | #endif |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1475 | nf_conntrack_proto_fini(); |
Patrick McHardy | 41d73ec | 2013-08-27 08:50:12 +0200 | [diff] [blame] | 1476 | nf_conntrack_seqadj_fini(); |
Gao feng | 5f69b8f | 2013-01-21 22:10:31 +0000 | [diff] [blame] | 1477 | nf_conntrack_labels_fini(); |
Gao feng | 5e615b2 | 2013-01-21 22:10:30 +0000 | [diff] [blame] | 1478 | nf_conntrack_helper_fini(); |
Gao feng | 8684094 | 2013-01-21 22:10:29 +0000 | [diff] [blame] | 1479 | nf_conntrack_timeout_fini(); |
Gao feng | 3fe0f94 | 2013-01-21 22:10:28 +0000 | [diff] [blame] | 1480 | nf_conntrack_ecache_fini(); |
Gao feng | 73f4001 | 2013-01-21 22:10:27 +0000 | [diff] [blame] | 1481 | nf_conntrack_tstamp_fini(); |
Gao feng | b7ff3a1 | 2013-01-21 22:10:26 +0000 | [diff] [blame] | 1482 | nf_conntrack_acct_fini(); |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 1483 | nf_conntrack_expect_fini(); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1484 | } |
Yasuyuki Kozakai | 7d3cdc6 | 2006-02-15 15:22:21 -0800 | [diff] [blame] | 1485 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1486 | /* |
| 1487 | * Mishearing the voices in his head, our hero wonders how he's |
| 1488 | * supposed to kill the mall. |
| 1489 | */ |
| 1490 | void nf_conntrack_cleanup_net(struct net *net) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1491 | { |
Vladimir Davydov | dece40e | 2013-03-13 23:40:14 +0000 | [diff] [blame] | 1492 | LIST_HEAD(single); |
| 1493 | |
| 1494 | list_add(&net->exit_list, &single); |
| 1495 | nf_conntrack_cleanup_net_list(&single); |
| 1496 | } |
| 1497 | |
| 1498 | void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list) |
| 1499 | { |
| 1500 | int busy; |
| 1501 | struct net *net; |
| 1502 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1503 | /* |
| 1504 | * This makes sure all current packets have passed through |
| 1505 | * netfilter framework. Roll on, two-stage module |
| 1506 | * delete... |
| 1507 | */ |
| 1508 | synchronize_net(); |
Vladimir Davydov | dece40e | 2013-03-13 23:40:14 +0000 | [diff] [blame] | 1509 | i_see_dead_people: |
| 1510 | busy = 0; |
| 1511 | list_for_each_entry(net, net_exit_list, exit_list) { |
Florian Westphal | c655bc6 | 2013-07-29 15:41:55 +0200 | [diff] [blame] | 1512 | nf_ct_iterate_cleanup(net, kill_all, NULL, 0, 0); |
Vladimir Davydov | dece40e | 2013-03-13 23:40:14 +0000 | [diff] [blame] | 1513 | if (atomic_read(&net->ct.count) != 0) |
| 1514 | busy = 1; |
| 1515 | } |
| 1516 | if (busy) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1517 | schedule(); |
| 1518 | goto i_see_dead_people; |
| 1519 | } |
| 1520 | |
Vladimir Davydov | dece40e | 2013-03-13 23:40:14 +0000 | [diff] [blame] | 1521 | list_for_each_entry(net, net_exit_list, exit_list) { |
| 1522 | nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size); |
| 1523 | nf_conntrack_proto_pernet_fini(net); |
| 1524 | nf_conntrack_helper_pernet_fini(net); |
| 1525 | nf_conntrack_ecache_pernet_fini(net); |
| 1526 | nf_conntrack_tstamp_pernet_fini(net); |
| 1527 | nf_conntrack_acct_pernet_fini(net); |
| 1528 | nf_conntrack_expect_pernet_fini(net); |
| 1529 | kmem_cache_destroy(net->ct.nf_conntrack_cachep); |
| 1530 | kfree(net->ct.slabname); |
| 1531 | free_percpu(net->ct.stat); |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1532 | free_percpu(net->ct.pcpu_lists); |
Vladimir Davydov | dece40e | 2013-03-13 23:40:14 +0000 | [diff] [blame] | 1533 | } |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1534 | } |
| 1535 | |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1536 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1537 | { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1538 | struct hlist_nulls_head *hash; |
| 1539 | unsigned int nr_slots, i; |
| 1540 | size_t sz; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1541 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1542 | BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); |
| 1543 | nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); |
| 1544 | sz = nr_slots * sizeof(struct hlist_nulls_head); |
| 1545 | hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, |
| 1546 | get_order(sz)); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1547 | if (!hash) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1548 | printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n"); |
Eric Dumazet | 966567b | 2011-12-19 16:01:38 -0500 | [diff] [blame] | 1549 | hash = vzalloc(sz); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1550 | } |
| 1551 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1552 | if (hash && nulls) |
| 1553 | for (i = 0; i < nr_slots; i++) |
| 1554 | INIT_HLIST_NULLS_HEAD(&hash[i], i); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1555 | |
| 1556 | return hash; |
| 1557 | } |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1558 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1559 | |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1560 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1561 | { |
Abhijit Pawar | 4b5511e | 2012-12-09 23:12:28 +0000 | [diff] [blame] | 1562 | int i, bucket, rc; |
Stephen Hemminger | 96eb24d | 2008-01-31 04:07:29 -0800 | [diff] [blame] | 1563 | unsigned int hashsize, old_size; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1564 | struct hlist_nulls_head *hash, *old_hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1565 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1566 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1567 | |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1568 | if (current->nsproxy->net_ns != &init_net) |
| 1569 | return -EOPNOTSUPP; |
| 1570 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1571 | /* On boot, we can set this without any fancy locking. */ |
| 1572 | if (!nf_conntrack_htable_size) |
| 1573 | return param_set_uint(val, kp); |
| 1574 | |
Abhijit Pawar | 4b5511e | 2012-12-09 23:12:28 +0000 | [diff] [blame] | 1575 | rc = kstrtouint(val, 0, &hashsize); |
| 1576 | if (rc) |
| 1577 | return rc; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1578 | if (!hashsize) |
| 1579 | return -EINVAL; |
| 1580 | |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1581 | hash = nf_ct_alloc_hashtable(&hashsize, 1); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1582 | if (!hash) |
| 1583 | return -ENOMEM; |
| 1584 | |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1585 | local_bh_disable(); |
| 1586 | nf_conntrack_all_lock(); |
| 1587 | write_seqcount_begin(&init_net.ct.generation); |
| 1588 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 1589 | /* Lookups in the old hash might happen in parallel, which means we |
| 1590 | * might get false negatives during connection lookup. New connections |
| 1591 | * 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] | 1592 | * though since that required taking the locks. |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 1593 | */ |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1594 | |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1595 | for (i = 0; i < init_net.ct.htable_size; i++) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1596 | while (!hlist_nulls_empty(&init_net.ct.hash[i])) { |
| 1597 | h = hlist_nulls_entry(init_net.ct.hash[i].first, |
| 1598 | struct nf_conntrack_tuple_hash, hnnode); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1599 | ct = nf_ct_tuplehash_to_ctrack(h); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1600 | hlist_nulls_del_rcu(&h->hnnode); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1601 | bucket = __hash_conntrack(&h->tuple, nf_ct_zone(ct), |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 1602 | hashsize); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1603 | hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1604 | } |
| 1605 | } |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1606 | old_size = init_net.ct.htable_size; |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1607 | old_hash = init_net.ct.hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1608 | |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1609 | init_net.ct.htable_size = nf_conntrack_htable_size = hashsize; |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1610 | init_net.ct.hash = hash; |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1611 | |
| 1612 | write_seqcount_end(&init_net.ct.generation); |
| 1613 | nf_conntrack_all_unlock(); |
| 1614 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1615 | |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1616 | nf_ct_free_hashtable(old_hash, old_size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1617 | return 0; |
| 1618 | } |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1619 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1620 | |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1621 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1622 | &nf_conntrack_htable_size, 0600); |
| 1623 | |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 1624 | void nf_ct_untracked_status_or(unsigned long bits) |
| 1625 | { |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1626 | int cpu; |
| 1627 | |
| 1628 | for_each_possible_cpu(cpu) |
| 1629 | per_cpu(nf_conntrack_untracked, cpu).status |= bits; |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 1630 | } |
| 1631 | EXPORT_SYMBOL_GPL(nf_ct_untracked_status_or); |
| 1632 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1633 | int nf_conntrack_init_start(void) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1634 | { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1635 | int max_factor = 8; |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1636 | int i, ret, cpu; |
| 1637 | |
Eric Dumazet | d5d2091 | 2014-03-17 13:37:53 -0700 | [diff] [blame] | 1638 | for (i = 0; i < CONNTRACK_LOCKS; i++) |
Jesper Dangaard Brouer | 93bb0ce | 2014-03-03 14:46:13 +0100 | [diff] [blame] | 1639 | spin_lock_init(&nf_conntrack_locks[i]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1640 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1641 | if (!nf_conntrack_htable_size) { |
Marcelo Leitner | 88eab47 | 2014-12-03 17:30:19 -0200 | [diff] [blame] | 1642 | /* Idea from tcp.c: use 1/16384 of memory. |
| 1643 | * On i386: 32MB machine has 512 buckets. |
| 1644 | * >= 1GB machines have 16384 buckets. |
| 1645 | * >= 4GB machines have 65536 buckets. |
| 1646 | */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1647 | nf_conntrack_htable_size |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 1648 | = (((totalram_pages << PAGE_SHIFT) / 16384) |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1649 | / sizeof(struct hlist_head)); |
Marcelo Leitner | 88eab47 | 2014-12-03 17:30:19 -0200 | [diff] [blame] | 1650 | if (totalram_pages > (4 * (1024 * 1024 * 1024 / PAGE_SIZE))) |
| 1651 | nf_conntrack_htable_size = 65536; |
| 1652 | else if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1653 | nf_conntrack_htable_size = 16384; |
| 1654 | if (nf_conntrack_htable_size < 32) |
| 1655 | nf_conntrack_htable_size = 32; |
| 1656 | |
| 1657 | /* Use a max. factor of four by default to get the same max as |
| 1658 | * with the old struct list_heads. When a table size is given |
| 1659 | * we use the old value of 8 to avoid reducing the max. |
| 1660 | * entries. */ |
| 1661 | max_factor = 4; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1662 | } |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1663 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 1664 | |
Stephen Hemminger | 654d0fb | 2010-05-13 15:02:08 +0200 | [diff] [blame] | 1665 | printk(KERN_INFO "nf_conntrack version %s (%u buckets, %d max)\n", |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 1666 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, |
| 1667 | nf_conntrack_max); |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 1668 | |
| 1669 | ret = nf_conntrack_expect_init(); |
| 1670 | if (ret < 0) |
| 1671 | goto err_expect; |
| 1672 | |
Gao feng | b7ff3a1 | 2013-01-21 22:10:26 +0000 | [diff] [blame] | 1673 | ret = nf_conntrack_acct_init(); |
| 1674 | if (ret < 0) |
| 1675 | goto err_acct; |
| 1676 | |
Gao feng | 73f4001 | 2013-01-21 22:10:27 +0000 | [diff] [blame] | 1677 | ret = nf_conntrack_tstamp_init(); |
| 1678 | if (ret < 0) |
| 1679 | goto err_tstamp; |
| 1680 | |
Gao feng | 3fe0f94 | 2013-01-21 22:10:28 +0000 | [diff] [blame] | 1681 | ret = nf_conntrack_ecache_init(); |
| 1682 | if (ret < 0) |
| 1683 | goto err_ecache; |
| 1684 | |
Gao feng | 8684094 | 2013-01-21 22:10:29 +0000 | [diff] [blame] | 1685 | ret = nf_conntrack_timeout_init(); |
| 1686 | if (ret < 0) |
| 1687 | goto err_timeout; |
| 1688 | |
Gao feng | 5e615b2 | 2013-01-21 22:10:30 +0000 | [diff] [blame] | 1689 | ret = nf_conntrack_helper_init(); |
| 1690 | if (ret < 0) |
| 1691 | goto err_helper; |
| 1692 | |
Gao feng | 5f69b8f | 2013-01-21 22:10:31 +0000 | [diff] [blame] | 1693 | ret = nf_conntrack_labels_init(); |
| 1694 | if (ret < 0) |
| 1695 | goto err_labels; |
| 1696 | |
Patrick McHardy | 41d73ec | 2013-08-27 08:50:12 +0200 | [diff] [blame] | 1697 | ret = nf_conntrack_seqadj_init(); |
| 1698 | if (ret < 0) |
| 1699 | goto err_seqadj; |
| 1700 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1701 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 1702 | ret = nf_ct_extend_register(&nf_ct_zone_extend); |
| 1703 | if (ret < 0) |
| 1704 | goto err_extend; |
| 1705 | #endif |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1706 | ret = nf_conntrack_proto_init(); |
| 1707 | if (ret < 0) |
| 1708 | goto err_proto; |
| 1709 | |
Patrick McHardy | 9edd7ca | 2010-02-08 11:16:26 -0800 | [diff] [blame] | 1710 | /* Set up fake conntrack: to never be deleted, not in any hashes */ |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1711 | for_each_possible_cpu(cpu) { |
| 1712 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1713 | write_pnet(&ct->ct_net, &init_net); |
| 1714 | atomic_set(&ct->ct_general.use, 1); |
| 1715 | } |
Patrick McHardy | 9edd7ca | 2010-02-08 11:16:26 -0800 | [diff] [blame] | 1716 | /* - and look it like as a confirmed connection */ |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 1717 | nf_ct_untracked_status_or(IPS_CONFIRMED | IPS_UNTRACKED); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1718 | return 0; |
| 1719 | |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1720 | err_proto: |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1721 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1722 | nf_ct_extend_unregister(&nf_ct_zone_extend); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1723 | err_extend: |
Eric Leblond | a900689 | 2012-04-18 11:20:41 +0200 | [diff] [blame] | 1724 | #endif |
Patrick McHardy | 41d73ec | 2013-08-27 08:50:12 +0200 | [diff] [blame] | 1725 | nf_conntrack_seqadj_fini(); |
| 1726 | err_seqadj: |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1727 | nf_conntrack_labels_fini(); |
Gao feng | 5f69b8f | 2013-01-21 22:10:31 +0000 | [diff] [blame] | 1728 | err_labels: |
| 1729 | nf_conntrack_helper_fini(); |
Gao feng | 5e615b2 | 2013-01-21 22:10:30 +0000 | [diff] [blame] | 1730 | err_helper: |
| 1731 | nf_conntrack_timeout_fini(); |
Gao feng | 8684094 | 2013-01-21 22:10:29 +0000 | [diff] [blame] | 1732 | err_timeout: |
| 1733 | nf_conntrack_ecache_fini(); |
Gao feng | 3fe0f94 | 2013-01-21 22:10:28 +0000 | [diff] [blame] | 1734 | err_ecache: |
| 1735 | nf_conntrack_tstamp_fini(); |
Gao feng | 73f4001 | 2013-01-21 22:10:27 +0000 | [diff] [blame] | 1736 | err_tstamp: |
| 1737 | nf_conntrack_acct_fini(); |
Gao feng | b7ff3a1 | 2013-01-21 22:10:26 +0000 | [diff] [blame] | 1738 | err_acct: |
| 1739 | nf_conntrack_expect_fini(); |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 1740 | err_expect: |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1741 | return ret; |
| 1742 | } |
| 1743 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1744 | void nf_conntrack_init_end(void) |
| 1745 | { |
| 1746 | /* For use by REJECT target */ |
| 1747 | RCU_INIT_POINTER(ip_ct_attach, nf_conntrack_attach); |
| 1748 | RCU_INIT_POINTER(nf_ct_destroy, destroy_conntrack); |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1749 | } |
| 1750 | |
Eric Dumazet | 8cc2019 | 2009-06-22 14:13:55 +0200 | [diff] [blame] | 1751 | /* |
| 1752 | * We need to use special "null" values, not used in hash table |
| 1753 | */ |
| 1754 | #define UNCONFIRMED_NULLS_VAL ((1<<30)+0) |
| 1755 | #define DYING_NULLS_VAL ((1<<30)+1) |
Pablo Neira Ayuso | 252b3e8 | 2012-12-11 04:07:42 +0000 | [diff] [blame] | 1756 | #define TEMPLATE_NULLS_VAL ((1<<30)+2) |
Eric Dumazet | 8cc2019 | 2009-06-22 14:13:55 +0200 | [diff] [blame] | 1757 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1758 | int nf_conntrack_init_net(struct net *net) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1759 | { |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1760 | int ret = -ENOMEM; |
| 1761 | int cpu; |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1762 | |
| 1763 | atomic_set(&net->ct.count, 0); |
Andrey Vagin | ee214d5 | 2014-04-11 21:34:20 +0400 | [diff] [blame] | 1764 | seqcount_init(&net->ct.generation); |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1765 | |
| 1766 | net->ct.pcpu_lists = alloc_percpu(struct ct_pcpu); |
| 1767 | if (!net->ct.pcpu_lists) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1768 | goto err_stat; |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1769 | |
| 1770 | for_each_possible_cpu(cpu) { |
| 1771 | struct ct_pcpu *pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu); |
| 1772 | |
| 1773 | spin_lock_init(&pcpu->lock); |
| 1774 | INIT_HLIST_NULLS_HEAD(&pcpu->unconfirmed, UNCONFIRMED_NULLS_VAL); |
| 1775 | INIT_HLIST_NULLS_HEAD(&pcpu->dying, DYING_NULLS_VAL); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1776 | } |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 1777 | |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1778 | net->ct.stat = alloc_percpu(struct ip_conntrack_stat); |
| 1779 | if (!net->ct.stat) |
| 1780 | goto err_pcpu_lists; |
| 1781 | |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 1782 | net->ct.slabname = kasprintf(GFP_KERNEL, "nf_conntrack_%p", net); |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1783 | if (!net->ct.slabname) |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 1784 | goto err_slabname; |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 1785 | |
| 1786 | net->ct.nf_conntrack_cachep = kmem_cache_create(net->ct.slabname, |
| 1787 | sizeof(struct nf_conn), 0, |
| 1788 | SLAB_DESTROY_BY_RCU, NULL); |
| 1789 | if (!net->ct.nf_conntrack_cachep) { |
| 1790 | printk(KERN_ERR "Unable to create nf_conn slab cache\n"); |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 1791 | goto err_cache; |
| 1792 | } |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1793 | |
| 1794 | net->ct.htable_size = nf_conntrack_htable_size; |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1795 | net->ct.hash = nf_ct_alloc_hashtable(&net->ct.htable_size, 1); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1796 | if (!net->ct.hash) { |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1797 | printk(KERN_ERR "Unable to create nf_conntrack_hash\n"); |
| 1798 | goto err_hash; |
| 1799 | } |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 1800 | ret = nf_conntrack_expect_pernet_init(net); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1801 | if (ret < 0) |
| 1802 | goto err_expect; |
Gao feng | b7ff3a1 | 2013-01-21 22:10:26 +0000 | [diff] [blame] | 1803 | ret = nf_conntrack_acct_pernet_init(net); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1804 | if (ret < 0) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1805 | goto err_acct; |
Gao feng | 73f4001 | 2013-01-21 22:10:27 +0000 | [diff] [blame] | 1806 | ret = nf_conntrack_tstamp_pernet_init(net); |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 1807 | if (ret < 0) |
| 1808 | goto err_tstamp; |
Gao feng | 3fe0f94 | 2013-01-21 22:10:28 +0000 | [diff] [blame] | 1809 | ret = nf_conntrack_ecache_pernet_init(net); |
Pablo Neira Ayuso | a0891aa | 2009-06-13 12:26:29 +0200 | [diff] [blame] | 1810 | if (ret < 0) |
| 1811 | goto err_ecache; |
Gao feng | 5e615b2 | 2013-01-21 22:10:30 +0000 | [diff] [blame] | 1812 | ret = nf_conntrack_helper_pernet_init(net); |
Eric Leblond | a900689 | 2012-04-18 11:20:41 +0200 | [diff] [blame] | 1813 | if (ret < 0) |
| 1814 | goto err_helper; |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1815 | ret = nf_conntrack_proto_pernet_init(net); |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1816 | if (ret < 0) |
| 1817 | goto err_proto; |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1818 | return 0; |
Florian Westphal | c539f01 | 2013-01-11 06:30:44 +0000 | [diff] [blame] | 1819 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1820 | err_proto: |
Gao feng | 5e615b2 | 2013-01-21 22:10:30 +0000 | [diff] [blame] | 1821 | nf_conntrack_helper_pernet_fini(net); |
Eric Leblond | a900689 | 2012-04-18 11:20:41 +0200 | [diff] [blame] | 1822 | err_helper: |
Gao feng | 3fe0f94 | 2013-01-21 22:10:28 +0000 | [diff] [blame] | 1823 | nf_conntrack_ecache_pernet_fini(net); |
Pablo Neira Ayuso | a0891aa | 2009-06-13 12:26:29 +0200 | [diff] [blame] | 1824 | err_ecache: |
Gao feng | 73f4001 | 2013-01-21 22:10:27 +0000 | [diff] [blame] | 1825 | nf_conntrack_tstamp_pernet_fini(net); |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 1826 | err_tstamp: |
Gao feng | b7ff3a1 | 2013-01-21 22:10:26 +0000 | [diff] [blame] | 1827 | nf_conntrack_acct_pernet_fini(net); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1828 | err_acct: |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 1829 | nf_conntrack_expect_pernet_fini(net); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1830 | err_expect: |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1831 | nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size); |
Alexey Dobriyan | 6058fa6 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1832 | err_hash: |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 1833 | kmem_cache_destroy(net->ct.nf_conntrack_cachep); |
| 1834 | err_cache: |
| 1835 | kfree(net->ct.slabname); |
| 1836 | err_slabname: |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1837 | free_percpu(net->ct.stat); |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 1838 | err_pcpu_lists: |
| 1839 | free_percpu(net->ct.pcpu_lists); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1840 | err_stat: |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1841 | return ret; |
| 1842 | } |