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 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 63 | DEFINE_SPINLOCK(nf_conntrack_lock); |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 64 | EXPORT_SYMBOL_GPL(nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 65 | |
Martin Josefsson | e2b7606 | 2006-11-29 02:35:04 +0100 | [diff] [blame] | 66 | unsigned int nf_conntrack_htable_size __read_mostly; |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 67 | EXPORT_SYMBOL_GPL(nf_conntrack_htable_size); |
| 68 | |
Hagen Paul Pfeifer | e478075 | 2009-02-20 10:47:09 +0100 | [diff] [blame] | 69 | unsigned int nf_conntrack_max __read_mostly; |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 70 | EXPORT_SYMBOL_GPL(nf_conntrack_max); |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 71 | |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 72 | DEFINE_PER_CPU(struct nf_conn, nf_conntrack_untracked); |
| 73 | EXPORT_PER_CPU_SYMBOL(nf_conntrack_untracked); |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 74 | |
Changli Gao | f682cef | 2011-01-05 04:23:23 +0000 | [diff] [blame] | 75 | unsigned int nf_conntrack_hash_rnd __read_mostly; |
Patrick McHardy | 4d4e61c | 2011-12-23 14:00:13 +0100 | [diff] [blame] | 76 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_rnd); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 77 | |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 78 | 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] | 79 | { |
Patrick McHardy | 0794935 | 2008-01-31 04:40:52 -0800 | [diff] [blame] | 80 | unsigned int n; |
Sami Farin | 9b88790 | 2007-03-14 16:43:00 -0700 | [diff] [blame] | 81 | |
Patrick McHardy | 0794935 | 2008-01-31 04:40:52 -0800 | [diff] [blame] | 82 | /* The direction must be ignored, so we hash everything up to the |
| 83 | * destination ports (which is a multiple of 4) and treat the last |
| 84 | * three bytes manually. |
| 85 | */ |
| 86 | n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32); |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 87 | return jhash2((u32 *)tuple, n, zone ^ nf_conntrack_hash_rnd ^ |
| 88 | (((__force __u16)tuple->dst.u.all << 16) | |
| 89 | tuple->dst.protonum)); |
| 90 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 91 | |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 92 | static u32 __hash_bucket(u32 hash, unsigned int size) |
| 93 | { |
| 94 | return ((u64)hash * size) >> 32; |
| 95 | } |
| 96 | |
| 97 | static u32 hash_bucket(u32 hash, const struct net *net) |
| 98 | { |
| 99 | return __hash_bucket(hash, net->ct.htable_size); |
| 100 | } |
| 101 | |
| 102 | static u_int32_t __hash_conntrack(const struct nf_conntrack_tuple *tuple, |
| 103 | u16 zone, unsigned int size) |
| 104 | { |
| 105 | return __hash_bucket(hash_conntrack_raw(tuple, zone), size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 106 | } |
| 107 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 108 | 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] | 109 | const struct nf_conntrack_tuple *tuple) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 110 | { |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 111 | return __hash_conntrack(tuple, zone, net->ct.htable_size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 112 | } |
| 113 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 114 | bool |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 115 | nf_ct_get_tuple(const struct sk_buff *skb, |
| 116 | unsigned int nhoff, |
| 117 | unsigned int dataoff, |
| 118 | u_int16_t l3num, |
| 119 | u_int8_t protonum, |
| 120 | struct nf_conntrack_tuple *tuple, |
| 121 | const struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 122 | const struct nf_conntrack_l4proto *l4proto) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 123 | { |
Philip Craig | 443a70d | 2008-04-29 03:35:10 -0700 | [diff] [blame] | 124 | memset(tuple, 0, sizeof(*tuple)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 125 | |
| 126 | tuple->src.l3num = l3num; |
| 127 | if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0) |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 128 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 129 | |
| 130 | tuple->dst.protonum = protonum; |
| 131 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; |
| 132 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 133 | return l4proto->pkt_to_tuple(skb, dataoff, tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 134 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 135 | EXPORT_SYMBOL_GPL(nf_ct_get_tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 136 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 137 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
| 138 | u_int16_t l3num, struct nf_conntrack_tuple *tuple) |
Yasuyuki Kozakai | e2a3123 | 2007-07-14 20:45:14 -0700 | [diff] [blame] | 139 | { |
| 140 | struct nf_conntrack_l3proto *l3proto; |
| 141 | struct nf_conntrack_l4proto *l4proto; |
| 142 | unsigned int protoff; |
| 143 | u_int8_t protonum; |
| 144 | int ret; |
| 145 | |
| 146 | rcu_read_lock(); |
| 147 | |
| 148 | l3proto = __nf_ct_l3proto_find(l3num); |
| 149 | ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum); |
| 150 | if (ret != NF_ACCEPT) { |
| 151 | rcu_read_unlock(); |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 152 | return false; |
Yasuyuki Kozakai | e2a3123 | 2007-07-14 20:45:14 -0700 | [diff] [blame] | 153 | } |
| 154 | |
| 155 | l4proto = __nf_ct_l4proto_find(l3num, protonum); |
| 156 | |
| 157 | ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, tuple, |
| 158 | l3proto, l4proto); |
| 159 | |
| 160 | rcu_read_unlock(); |
| 161 | return ret; |
| 162 | } |
| 163 | EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); |
| 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_invert_tuple(struct nf_conntrack_tuple *inverse, |
| 167 | const struct nf_conntrack_tuple *orig, |
| 168 | const struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 169 | const struct nf_conntrack_l4proto *l4proto) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 170 | { |
Philip Craig | 443a70d | 2008-04-29 03:35:10 -0700 | [diff] [blame] | 171 | memset(inverse, 0, sizeof(*inverse)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 172 | |
| 173 | inverse->src.l3num = orig->src.l3num; |
| 174 | if (l3proto->invert_tuple(inverse, orig) == 0) |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 175 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 176 | |
| 177 | inverse->dst.dir = !orig->dst.dir; |
| 178 | |
| 179 | inverse->dst.protonum = orig->dst.protonum; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 180 | return l4proto->invert_tuple(inverse, orig); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 181 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 182 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 183 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 184 | static void |
| 185 | clean_from_lists(struct nf_conn *ct) |
| 186 | { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 187 | pr_debug("clean_from_lists(%p)\n", ct); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 188 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
| 189 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 190 | |
| 191 | /* Destroy all pending expectations */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 192 | nf_ct_remove_expectations(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 193 | } |
| 194 | |
| 195 | static void |
| 196 | destroy_conntrack(struct nf_conntrack *nfct) |
| 197 | { |
| 198 | struct nf_conn *ct = (struct nf_conn *)nfct; |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 199 | struct net *net = nf_ct_net(ct); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 200 | struct nf_conntrack_l4proto *l4proto; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 201 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 202 | pr_debug("destroy_conntrack(%p)\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 203 | NF_CT_ASSERT(atomic_read(&nfct->use) == 0); |
| 204 | NF_CT_ASSERT(!timer_pending(&ct->timeout)); |
| 205 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 206 | /* To make sure we don't get any weird locking issues here: |
| 207 | * destroy_conntrack() MUST NOT be called with a write lock |
| 208 | * to nf_conntrack_lock!!! -HW */ |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 209 | rcu_read_lock(); |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 210 | 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] | 211 | if (l4proto && l4proto->destroy) |
| 212 | l4proto->destroy(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 213 | |
Patrick McHardy | 982d9a9 | 2007-02-12 11:14:11 -0800 | [diff] [blame] | 214 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 215 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 216 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 217 | /* Expectations will have been removed in clean_from_lists, |
| 218 | * except TFTP can create an expectation on the first packet, |
| 219 | * before connection is in the list, so we need to clean here, |
| 220 | * too. */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 221 | nf_ct_remove_expectations(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 222 | |
Pablo Neira Ayuso | 04dac01 | 2012-11-27 21:30:52 +0100 | [diff] [blame] | 223 | /* We overload first tuple to link into unconfirmed or dying list.*/ |
| 224 | BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode)); |
| 225 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 226 | |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 227 | NF_CT_STAT_INC(net, delete); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 228 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 229 | |
| 230 | if (ct->master) |
| 231 | nf_ct_put(ct->master); |
| 232 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 233 | pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 234 | nf_conntrack_free(ct); |
| 235 | } |
| 236 | |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 237 | static void nf_ct_delete_from_lists(struct nf_conn *ct) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 238 | { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 239 | struct net *net = nf_ct_net(ct); |
Patrick McHardy | 5397e97 | 2007-05-19 14:23:52 -0700 | [diff] [blame] | 240 | |
Pablo Neira Ayuso | 9858a3a | 2009-06-13 12:28:22 +0200 | [diff] [blame] | 241 | nf_ct_helper_destroy(ct); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 242 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 243 | /* Inside lock so preempt is disabled on module removal path. |
| 244 | * Otherwise we can get spurious warnings. */ |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 245 | NF_CT_STAT_INC(net, delete_list); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 246 | clean_from_lists(ct); |
Pablo Neira Ayuso | 04dac01 | 2012-11-27 21:30:52 +0100 | [diff] [blame] | 247 | /* add this conntrack to the dying list */ |
| 248 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
| 249 | &net->ct.dying); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 250 | spin_unlock_bh(&nf_conntrack_lock); |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 251 | } |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 252 | |
| 253 | static void death_by_event(unsigned long ul_conntrack) |
| 254 | { |
| 255 | struct nf_conn *ct = (void *)ul_conntrack; |
| 256 | struct net *net = nf_ct_net(ct); |
Pablo Neira Ayuso | 5b423f6 | 2012-08-29 16:25:49 +0000 | [diff] [blame] | 257 | struct nf_conntrack_ecache *ecache = nf_ct_ecache_find(ct); |
| 258 | |
| 259 | BUG_ON(ecache == NULL); |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 260 | |
| 261 | if (nf_conntrack_event(IPCT_DESTROY, ct) < 0) { |
| 262 | /* bad luck, let's retry again */ |
Pablo Neira Ayuso | 5b423f6 | 2012-08-29 16:25:49 +0000 | [diff] [blame] | 263 | ecache->timeout.expires = jiffies + |
Akinobu Mita | ca3d41a | 2013-04-29 16:21:39 -0700 | [diff] [blame] | 264 | (prandom_u32() % net->ct.sysctl_events_retry_timeout); |
Pablo Neira Ayuso | 5b423f6 | 2012-08-29 16:25:49 +0000 | [diff] [blame] | 265 | add_timer(&ecache->timeout); |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 266 | return; |
| 267 | } |
| 268 | /* we've got the event delivered, now it's dying */ |
| 269 | set_bit(IPS_DYING_BIT, &ct->status); |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 270 | nf_ct_put(ct); |
| 271 | } |
| 272 | |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 273 | static void nf_ct_dying_timeout(struct nf_conn *ct) |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 274 | { |
| 275 | struct net *net = nf_ct_net(ct); |
Pablo Neira Ayuso | 5b423f6 | 2012-08-29 16:25:49 +0000 | [diff] [blame] | 276 | struct nf_conntrack_ecache *ecache = nf_ct_ecache_find(ct); |
| 277 | |
| 278 | BUG_ON(ecache == NULL); |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 279 | |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 280 | /* set a new timer to retry event delivery */ |
Pablo Neira Ayuso | 5b423f6 | 2012-08-29 16:25:49 +0000 | [diff] [blame] | 281 | setup_timer(&ecache->timeout, death_by_event, (unsigned long)ct); |
| 282 | ecache->timeout.expires = jiffies + |
Akinobu Mita | ca3d41a | 2013-04-29 16:21:39 -0700 | [diff] [blame] | 283 | (prandom_u32() % net->ct.sysctl_events_retry_timeout); |
Pablo Neira Ayuso | 5b423f6 | 2012-08-29 16:25:49 +0000 | [diff] [blame] | 284 | add_timer(&ecache->timeout); |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 285 | } |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 286 | |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 287 | 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] | 288 | { |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 289 | struct nf_conn_tstamp *tstamp; |
| 290 | |
| 291 | tstamp = nf_conn_tstamp_find(ct); |
| 292 | if (tstamp && tstamp->stop == 0) |
| 293 | tstamp->stop = ktime_to_ns(ktime_get_real()); |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 294 | |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 295 | if (!nf_ct_is_dying(ct) && |
| 296 | unlikely(nf_conntrack_event_report(IPCT_DESTROY, ct, |
| 297 | portid, report) < 0)) { |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 298 | /* destroy event was not delivered */ |
| 299 | nf_ct_delete_from_lists(ct); |
Pablo Neira Ayuso | 04dac01 | 2012-11-27 21:30:52 +0100 | [diff] [blame] | 300 | nf_ct_dying_timeout(ct); |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 301 | return false; |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 302 | } |
| 303 | set_bit(IPS_DYING_BIT, &ct->status); |
| 304 | nf_ct_delete_from_lists(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 305 | nf_ct_put(ct); |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 306 | return true; |
| 307 | } |
| 308 | EXPORT_SYMBOL_GPL(nf_ct_delete); |
| 309 | |
| 310 | static void death_by_timeout(unsigned long ul_conntrack) |
| 311 | { |
| 312 | nf_ct_delete((struct nf_conn *)ul_conntrack, 0, 0); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 313 | } |
| 314 | |
Andrey Vagin | c6825c0 | 2014-01-29 19:34:14 +0100 | [diff] [blame] | 315 | static inline bool |
| 316 | nf_ct_key_equal(struct nf_conntrack_tuple_hash *h, |
| 317 | const struct nf_conntrack_tuple *tuple, |
| 318 | u16 zone) |
| 319 | { |
| 320 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); |
| 321 | |
| 322 | /* A conntrack can be recreated with the equal tuple, |
| 323 | * so we need to check that the conntrack is confirmed |
| 324 | */ |
| 325 | return nf_ct_tuple_equal(tuple, &h->tuple) && |
| 326 | nf_ct_zone(ct) == zone && |
| 327 | nf_ct_is_confirmed(ct); |
| 328 | } |
| 329 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 330 | /* |
| 331 | * Warning : |
| 332 | * - Caller must take a reference on returned object |
| 333 | * and recheck nf_ct_tuple_equal(tuple, &h->tuple) |
| 334 | * OR |
| 335 | * - Caller must lock nf_conntrack_lock before calling this function |
| 336 | */ |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 337 | static struct nf_conntrack_tuple_hash * |
| 338 | ____nf_conntrack_find(struct net *net, u16 zone, |
| 339 | const struct nf_conntrack_tuple *tuple, u32 hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 340 | { |
| 341 | struct nf_conntrack_tuple_hash *h; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 342 | struct hlist_nulls_node *n; |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 343 | unsigned int bucket = hash_bucket(hash, net); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 344 | |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 345 | /* Disable BHs the entire time since we normally need to disable them |
| 346 | * at least once for the stats anyway. |
| 347 | */ |
| 348 | local_bh_disable(); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 349 | begin: |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 350 | 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] | 351 | if (nf_ct_key_equal(h, tuple, zone)) { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 352 | NF_CT_STAT_INC(net, found); |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 353 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 354 | return h; |
| 355 | } |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 356 | NF_CT_STAT_INC(net, searched); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 357 | } |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 358 | /* |
| 359 | * if the nulls value we got at the end of this lookup is |
| 360 | * not the expected one, we must restart lookup. |
| 361 | * We probably met an item that was moved to another chain. |
| 362 | */ |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 363 | if (get_nulls_value(n) != bucket) { |
Jesper Dangaard Brouer | af740b2 | 2010-04-23 12:34:56 +0200 | [diff] [blame] | 364 | NF_CT_STAT_INC(net, search_restart); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 365 | goto begin; |
Jesper Dangaard Brouer | af740b2 | 2010-04-23 12:34:56 +0200 | [diff] [blame] | 366 | } |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 367 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 368 | |
| 369 | return NULL; |
| 370 | } |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 371 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 372 | /* Find a connection corresponding to a tuple. */ |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 373 | static struct nf_conntrack_tuple_hash * |
| 374 | __nf_conntrack_find_get(struct net *net, u16 zone, |
| 375 | const struct nf_conntrack_tuple *tuple, u32 hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 376 | { |
| 377 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 378 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 379 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 380 | rcu_read_lock(); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 381 | begin: |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 382 | h = ____nf_conntrack_find(net, zone, tuple, hash); |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 383 | if (h) { |
| 384 | ct = nf_ct_tuplehash_to_ctrack(h); |
Patrick McHardy | 8d8890b7 | 2009-06-22 14:14:41 +0200 | [diff] [blame] | 385 | if (unlikely(nf_ct_is_dying(ct) || |
| 386 | !atomic_inc_not_zero(&ct->ct_general.use))) |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 387 | h = NULL; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 388 | else { |
Andrey Vagin | c6825c0 | 2014-01-29 19:34:14 +0100 | [diff] [blame] | 389 | if (unlikely(!nf_ct_key_equal(h, tuple, zone))) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 390 | nf_ct_put(ct); |
| 391 | goto begin; |
| 392 | } |
| 393 | } |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 394 | } |
| 395 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 396 | |
| 397 | return h; |
| 398 | } |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 399 | |
| 400 | struct nf_conntrack_tuple_hash * |
| 401 | nf_conntrack_find_get(struct net *net, u16 zone, |
| 402 | const struct nf_conntrack_tuple *tuple) |
| 403 | { |
| 404 | return __nf_conntrack_find_get(net, zone, tuple, |
| 405 | hash_conntrack_raw(tuple, zone)); |
| 406 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 407 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 408 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 409 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
| 410 | unsigned int hash, |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame^] | 411 | unsigned int reply_hash) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 412 | { |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 413 | struct net *net = nf_ct_net(ct); |
| 414 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 415 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 416 | &net->ct.hash[hash]); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 417 | 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^] | 418 | &net->ct.hash[reply_hash]); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 419 | } |
| 420 | |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 421 | int |
| 422 | nf_conntrack_hash_check_insert(struct nf_conn *ct) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 423 | { |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 424 | struct net *net = nf_ct_net(ct); |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame^] | 425 | unsigned int hash, reply_hash; |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 426 | struct nf_conntrack_tuple_hash *h; |
| 427 | struct hlist_nulls_node *n; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 428 | u16 zone; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 429 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 430 | zone = nf_ct_zone(ct); |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 431 | hash = hash_conntrack(net, zone, |
| 432 | &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame^] | 433 | reply_hash = hash_conntrack(net, zone, |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 434 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 435 | |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 436 | spin_lock_bh(&nf_conntrack_lock); |
| 437 | |
| 438 | /* See if there's one in the list already, including reverse */ |
| 439 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode) |
| 440 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
| 441 | &h->tuple) && |
| 442 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) |
| 443 | goto out; |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame^] | 444 | 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] | 445 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
| 446 | &h->tuple) && |
| 447 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) |
| 448 | goto out; |
| 449 | |
| 450 | add_timer(&ct->timeout); |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 451 | smp_wmb(); |
| 452 | /* The caller holds a reference to this object */ |
| 453 | atomic_set(&ct->ct_general.use, 2); |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame^] | 454 | __nf_conntrack_hash_insert(ct, hash, reply_hash); |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 455 | NF_CT_STAT_INC(net, insert); |
| 456 | spin_unlock_bh(&nf_conntrack_lock); |
| 457 | |
| 458 | return 0; |
| 459 | |
| 460 | out: |
| 461 | NF_CT_STAT_INC(net, insert_failed); |
| 462 | spin_unlock_bh(&nf_conntrack_lock); |
| 463 | return -EEXIST; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 464 | } |
Jozsef Kadlecsik | 7d367e0 | 2012-02-24 11:45:49 +0100 | [diff] [blame] | 465 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_check_insert); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 466 | |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 467 | /* deletion from this larval template list happens via nf_ct_put() */ |
| 468 | void nf_conntrack_tmpl_insert(struct net *net, struct nf_conn *tmpl) |
| 469 | { |
| 470 | __set_bit(IPS_TEMPLATE_BIT, &tmpl->status); |
| 471 | __set_bit(IPS_CONFIRMED_BIT, &tmpl->status); |
| 472 | nf_conntrack_get(&tmpl->ct_general); |
| 473 | |
| 474 | spin_lock_bh(&nf_conntrack_lock); |
| 475 | /* Overload tuple linked list to put us in template list. */ |
| 476 | hlist_nulls_add_head_rcu(&tmpl->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
| 477 | &net->ct.tmpl); |
| 478 | spin_unlock_bh(&nf_conntrack_lock); |
| 479 | } |
| 480 | EXPORT_SYMBOL_GPL(nf_conntrack_tmpl_insert); |
| 481 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 482 | /* Confirm a connection given skb; places it in hash table */ |
| 483 | int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 484 | __nf_conntrack_confirm(struct sk_buff *skb) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 485 | { |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame^] | 486 | unsigned int hash, reply_hash; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 487 | struct nf_conntrack_tuple_hash *h; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 488 | struct nf_conn *ct; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 489 | struct nf_conn_help *help; |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 490 | struct nf_conn_tstamp *tstamp; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 491 | struct hlist_nulls_node *n; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 492 | enum ip_conntrack_info ctinfo; |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 493 | struct net *net; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 494 | u16 zone; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 495 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 496 | ct = nf_ct_get(skb, &ctinfo); |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 497 | net = nf_ct_net(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 498 | |
| 499 | /* ipt_REJECT uses nf_conntrack_attach to attach related |
| 500 | ICMP/TCP RST packets in other direction. Actual packet |
| 501 | which created connection will be IP_CT_NEW or for an |
| 502 | expected connection, IP_CT_RELATED. */ |
| 503 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) |
| 504 | return NF_ACCEPT; |
| 505 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 506 | zone = nf_ct_zone(ct); |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 507 | /* reuse the hash saved before */ |
| 508 | hash = *(unsigned long *)&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev; |
| 509 | hash = hash_bucket(hash, net); |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame^] | 510 | reply_hash = hash_conntrack(net, zone, |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 511 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 512 | |
| 513 | /* We're not in hash table, and we refuse to set up related |
| 514 | connections for unconfirmed conns. But packet copies and |
| 515 | REJECT will give spurious warnings here. */ |
| 516 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ |
| 517 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 518 | /* No external references means no one else could have |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 519 | confirmed us. */ |
| 520 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 521 | pr_debug("Confirming conntrack %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 522 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 523 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 524 | |
Joerg Marx | fc35077 | 2010-05-20 15:55:30 +0200 | [diff] [blame] | 525 | /* We have to check the DYING flag inside the lock to prevent |
| 526 | a race against nf_ct_get_next_corpse() possibly called from |
| 527 | user context, else we insert an already 'dead' hash, blocking |
| 528 | further use of that particular connection -JM */ |
| 529 | |
| 530 | if (unlikely(nf_ct_is_dying(ct))) { |
| 531 | spin_unlock_bh(&nf_conntrack_lock); |
| 532 | return NF_ACCEPT; |
| 533 | } |
| 534 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 535 | /* See if there's one in the list already, including reverse: |
| 536 | NAT could have grabbed it without realizing, since we're |
| 537 | not in the hash. If there is, we lost race. */ |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 538 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 539 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 540 | &h->tuple) && |
| 541 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 542 | goto out; |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame^] | 543 | 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] | 544 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 545 | &h->tuple) && |
| 546 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 547 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 548 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 549 | /* Remove from unconfirmed list */ |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 550 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 551 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 552 | /* Timer relative to confirmation time, not original |
| 553 | setting time, otherwise we'd get timer wrap in |
| 554 | weird delay cases. */ |
| 555 | ct->timeout.expires += jiffies; |
| 556 | add_timer(&ct->timeout); |
| 557 | atomic_inc(&ct->ct_general.use); |
Changli Gao | 45eec34 | 2011-01-18 15:08:13 +0100 | [diff] [blame] | 558 | ct->status |= IPS_CONFIRMED; |
Patrick McHardy | 5c8ec91 | 2009-06-22 14:14:16 +0200 | [diff] [blame] | 559 | |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 560 | /* set conntrack timestamp, if enabled. */ |
| 561 | tstamp = nf_conn_tstamp_find(ct); |
| 562 | if (tstamp) { |
| 563 | if (skb->tstamp.tv64 == 0) |
Joe Perches | e319269 | 2012-06-03 17:41:40 +0000 | [diff] [blame] | 564 | __net_timestamp(skb); |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 565 | |
| 566 | tstamp->start = ktime_to_ns(skb->tstamp); |
| 567 | } |
Patrick McHardy | 5c8ec91 | 2009-06-22 14:14:16 +0200 | [diff] [blame] | 568 | /* Since the lookup is lockless, hash insertion must be done after |
| 569 | * starting the timer and setting the CONFIRMED bit. The RCU barriers |
| 570 | * guarantee that no other CPU can find the conntrack before the above |
| 571 | * stores are visible. |
| 572 | */ |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame^] | 573 | __nf_conntrack_hash_insert(ct, hash, reply_hash); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 574 | NF_CT_STAT_INC(net, insert); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 575 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | 5c8ec91 | 2009-06-22 14:14:16 +0200 | [diff] [blame] | 576 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 577 | help = nfct_help(ct); |
| 578 | if (help && help->helper) |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 579 | nf_conntrack_event_cache(IPCT_HELPER, ct); |
Pablo Neira Ayuso | 17e6e4e | 2009-06-02 20:08:46 +0200 | [diff] [blame] | 580 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 581 | nf_conntrack_event_cache(master_ct(ct) ? |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 582 | IPCT_RELATED : IPCT_NEW, ct); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 583 | return NF_ACCEPT; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 584 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 585 | out: |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 586 | NF_CT_STAT_INC(net, insert_failed); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 587 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 588 | return NF_DROP; |
| 589 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 590 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 591 | |
| 592 | /* Returns true if a connection correspondings to the tuple (required |
| 593 | for NAT). */ |
| 594 | int |
| 595 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, |
| 596 | const struct nf_conn *ignored_conntrack) |
| 597 | { |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 598 | struct net *net = nf_ct_net(ignored_conntrack); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 599 | struct nf_conntrack_tuple_hash *h; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 600 | struct hlist_nulls_node *n; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 601 | struct nf_conn *ct; |
| 602 | u16 zone = nf_ct_zone(ignored_conntrack); |
| 603 | unsigned int hash = hash_conntrack(net, zone, tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 604 | |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 605 | /* Disable BHs the entire time since we need to disable them at |
| 606 | * least once for the stats anyway. |
| 607 | */ |
| 608 | rcu_read_lock_bh(); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 609 | 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] | 610 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 611 | if (ct != ignored_conntrack && |
| 612 | nf_ct_tuple_equal(tuple, &h->tuple) && |
| 613 | nf_ct_zone(ct) == zone) { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 614 | NF_CT_STAT_INC(net, found); |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 615 | rcu_read_unlock_bh(); |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 616 | return 1; |
| 617 | } |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 618 | NF_CT_STAT_INC(net, searched); |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 619 | } |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 620 | rcu_read_unlock_bh(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 621 | |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 622 | return 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 623 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 624 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 625 | |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 626 | #define NF_CT_EVICTION_RANGE 8 |
| 627 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 628 | /* There's a small race here where we may free a just-assured |
| 629 | connection. Too bad: we're in trouble anyway. */ |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 630 | static noinline int early_drop(struct net *net, unsigned int hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 631 | { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 632 | /* Use oldest entry, which is roughly LRU */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 633 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 634 | struct nf_conn *ct = NULL, *tmp; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 635 | struct hlist_nulls_node *n; |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 636 | unsigned int i, cnt = 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 637 | int dropped = 0; |
| 638 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 639 | rcu_read_lock(); |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 640 | for (i = 0; i < net->ct.htable_size; i++) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 641 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], |
| 642 | hnnode) { |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 643 | tmp = nf_ct_tuplehash_to_ctrack(h); |
| 644 | if (!test_bit(IPS_ASSURED_BIT, &tmp->status)) |
| 645 | ct = tmp; |
| 646 | cnt++; |
| 647 | } |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 648 | |
Changli Gao | 5ae27aa2 | 2009-11-05 14:51:31 +0100 | [diff] [blame] | 649 | if (ct != NULL) { |
| 650 | if (likely(!nf_ct_is_dying(ct) && |
| 651 | atomic_inc_not_zero(&ct->ct_general.use))) |
| 652 | break; |
| 653 | else |
| 654 | ct = NULL; |
| 655 | } |
| 656 | |
| 657 | if (cnt >= NF_CT_EVICTION_RANGE) |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 658 | break; |
Changli Gao | 5ae27aa2 | 2009-11-05 14:51:31 +0100 | [diff] [blame] | 659 | |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 660 | hash = (hash + 1) % net->ct.htable_size; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 661 | } |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 662 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 663 | |
| 664 | if (!ct) |
| 665 | return dropped; |
| 666 | |
| 667 | if (del_timer(&ct->timeout)) { |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 668 | if (nf_ct_delete(ct, 0, 0)) { |
Pablo Neira Ayuso | 74138511 | 2012-03-06 01:22:55 +0000 | [diff] [blame] | 669 | dropped = 1; |
| 670 | NF_CT_STAT_INC_ATOMIC(net, early_drop); |
| 671 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 672 | } |
| 673 | nf_ct_put(ct); |
| 674 | return dropped; |
| 675 | } |
| 676 | |
Changli Gao | f682cef | 2011-01-05 04:23:23 +0000 | [diff] [blame] | 677 | void init_nf_conntrack_hash_rnd(void) |
| 678 | { |
| 679 | unsigned int rand; |
| 680 | |
| 681 | /* |
| 682 | * Why not initialize nf_conntrack_rnd in a "init()" function ? |
| 683 | * Because there isn't enough entropy when system initializing, |
| 684 | * and we initialize it as late as possible. |
| 685 | */ |
| 686 | do { |
| 687 | get_random_bytes(&rand, sizeof(rand)); |
| 688 | } while (!rand); |
| 689 | cmpxchg(&nf_conntrack_hash_rnd, 0, rand); |
| 690 | } |
| 691 | |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 692 | static struct nf_conn * |
| 693 | __nf_conntrack_alloc(struct net *net, u16 zone, |
| 694 | const struct nf_conntrack_tuple *orig, |
| 695 | const struct nf_conntrack_tuple *repl, |
| 696 | gfp_t gfp, u32 hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 697 | { |
Julia Lawall | cd7fcbf | 2009-01-12 00:06:08 +0000 | [diff] [blame] | 698 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 699 | |
Changli Gao | b239096 | 2010-09-16 19:55:03 +0200 | [diff] [blame] | 700 | if (unlikely(!nf_conntrack_hash_rnd)) { |
Changli Gao | f682cef | 2011-01-05 04:23:23 +0000 | [diff] [blame] | 701 | init_nf_conntrack_hash_rnd(); |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 702 | /* recompute the hash as nf_conntrack_hash_rnd is initialized */ |
| 703 | hash = hash_conntrack_raw(orig, zone); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 704 | } |
| 705 | |
Pablo Neira Ayuso | 5251e2d | 2006-09-20 12:01:06 -0700 | [diff] [blame] | 706 | /* We don't want any race condition at early drop stage */ |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 707 | atomic_inc(&net->ct.count); |
Pablo Neira Ayuso | 5251e2d | 2006-09-20 12:01:06 -0700 | [diff] [blame] | 708 | |
Patrick McHardy | 76eb946 | 2008-01-31 04:41:44 -0800 | [diff] [blame] | 709 | if (nf_conntrack_max && |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 710 | unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 711 | if (!early_drop(net, hash_bucket(hash, net))) { |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 712 | atomic_dec(&net->ct.count); |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 713 | net_warn_ratelimited("nf_conntrack: table full, dropping packet\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 714 | return ERR_PTR(-ENOMEM); |
| 715 | } |
| 716 | } |
| 717 | |
Eric Dumazet | 941297f | 2009-07-16 14:03:40 +0200 | [diff] [blame] | 718 | /* |
| 719 | * Do not use kmem_cache_zalloc(), as this cache uses |
| 720 | * SLAB_DESTROY_BY_RCU. |
| 721 | */ |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 722 | ct = kmem_cache_alloc(net->ct.nf_conntrack_cachep, gfp); |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 723 | if (ct == NULL) { |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 724 | atomic_dec(&net->ct.count); |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 725 | return ERR_PTR(-ENOMEM); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 726 | } |
Eric Dumazet | 941297f | 2009-07-16 14:03:40 +0200 | [diff] [blame] | 727 | /* |
| 728 | * Let ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.next |
| 729 | * and ct->tuplehash[IP_CT_DIR_REPLY].hnnode.next unchanged. |
| 730 | */ |
| 731 | memset(&ct->tuplehash[IP_CT_DIR_MAX], 0, |
Changli Gao | e5fc9e7 | 2010-11-12 17:33:17 +0100 | [diff] [blame] | 732 | offsetof(struct nf_conn, proto) - |
| 733 | offsetof(struct nf_conn, tuplehash[IP_CT_DIR_MAX])); |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 734 | spin_lock_init(&ct->lock); |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 735 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
Eric Dumazet | 941297f | 2009-07-16 14:03:40 +0200 | [diff] [blame] | 736 | ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL; |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 737 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 738 | /* save hash for reusing when confirming */ |
| 739 | *(unsigned long *)(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev) = hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 740 | /* Don't set timer yet: wait for confirmation */ |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 741 | setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct); |
Eric Dumazet | c2d9ba9 | 2010-06-01 06:51:19 +0000 | [diff] [blame] | 742 | write_pnet(&ct->ct_net, net); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 743 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 744 | if (zone) { |
| 745 | struct nf_conntrack_zone *nf_ct_zone; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 746 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 747 | nf_ct_zone = nf_ct_ext_add(ct, NF_CT_EXT_ZONE, GFP_ATOMIC); |
| 748 | if (!nf_ct_zone) |
| 749 | goto out_free; |
| 750 | nf_ct_zone->id = zone; |
| 751 | } |
| 752 | #endif |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 753 | /* Because we use RCU lookups, we set ct_general.use to zero before |
| 754 | * this is inserted in any list. |
Eric Dumazet | 941297f | 2009-07-16 14:03:40 +0200 | [diff] [blame] | 755 | */ |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 756 | atomic_set(&ct->ct_general.use, 0); |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 757 | return ct; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 758 | |
| 759 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 760 | out_free: |
Pablo Neira Ayuso | d96fc65 | 2012-04-03 16:45:54 +0200 | [diff] [blame] | 761 | atomic_dec(&net->ct.count); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 762 | kmem_cache_free(net->ct.nf_conntrack_cachep, ct); |
| 763 | return ERR_PTR(-ENOMEM); |
| 764 | #endif |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 765 | } |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 766 | |
| 767 | struct nf_conn *nf_conntrack_alloc(struct net *net, u16 zone, |
| 768 | const struct nf_conntrack_tuple *orig, |
| 769 | const struct nf_conntrack_tuple *repl, |
| 770 | gfp_t gfp) |
| 771 | { |
| 772 | return __nf_conntrack_alloc(net, zone, orig, repl, gfp, 0); |
| 773 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 774 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 775 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 776 | void nf_conntrack_free(struct nf_conn *ct) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 777 | { |
Eric Dumazet | 1d45209 | 2009-03-24 14:26:50 +0100 | [diff] [blame] | 778 | struct net *net = nf_ct_net(ct); |
| 779 | |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 780 | /* A freed object has refcnt == 0, that's |
| 781 | * the golden rule for SLAB_DESTROY_BY_RCU |
| 782 | */ |
| 783 | NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 0); |
| 784 | |
Patrick McHardy | ceeff75 | 2008-06-11 17:51:10 -0700 | [diff] [blame] | 785 | nf_ct_ext_destroy(ct); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 786 | nf_ct_ext_free(ct); |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 787 | kmem_cache_free(net->ct.nf_conntrack_cachep, ct); |
Pablo Neira Ayuso | 0c3c6c0 | 2013-11-18 12:53:59 +0100 | [diff] [blame] | 788 | smp_mb__before_atomic_dec(); |
| 789 | atomic_dec(&net->ct.count); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 790 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 791 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 792 | |
Florian Westphal | c539f01 | 2013-01-11 06:30:44 +0000 | [diff] [blame] | 793 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 794 | /* Allocate a new conntrack: we return -ENOMEM if classification |
| 795 | failed due to stress. Otherwise it really is unclassifiable. */ |
| 796 | static struct nf_conntrack_tuple_hash * |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 797 | init_conntrack(struct net *net, struct nf_conn *tmpl, |
Alexey Dobriyan | 5a1fb39 | 2008-10-08 11:35:02 +0200 | [diff] [blame] | 798 | const struct nf_conntrack_tuple *tuple, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 799 | struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 800 | struct nf_conntrack_l4proto *l4proto, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 801 | struct sk_buff *skb, |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 802 | unsigned int dataoff, u32 hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 803 | { |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 804 | struct nf_conn *ct; |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 805 | struct nf_conn_help *help; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 806 | struct nf_conntrack_tuple repl_tuple; |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 807 | struct nf_conntrack_ecache *ecache; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 808 | struct nf_conntrack_expect *exp; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 809 | u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE; |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 810 | struct nf_conn_timeout *timeout_ext; |
| 811 | unsigned int *timeouts; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 812 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 813 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 814 | pr_debug("Can't invert tuple.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 815 | return NULL; |
| 816 | } |
| 817 | |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 818 | ct = __nf_conntrack_alloc(net, zone, tuple, &repl_tuple, GFP_ATOMIC, |
| 819 | hash); |
Joe Perches | 0a9ee81 | 2011-08-29 14:17:25 -0700 | [diff] [blame] | 820 | if (IS_ERR(ct)) |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 821 | return (struct nf_conntrack_tuple_hash *)ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 822 | |
Patrick McHardy | 48b1de4 | 2013-08-27 08:50:14 +0200 | [diff] [blame] | 823 | if (tmpl && nfct_synproxy(tmpl)) { |
| 824 | nfct_seqadj_ext_add(ct); |
| 825 | nfct_synproxy_ext_add(ct); |
| 826 | } |
| 827 | |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 828 | timeout_ext = tmpl ? nf_ct_timeout_find(tmpl) : NULL; |
| 829 | if (timeout_ext) |
| 830 | timeouts = NF_CT_TIMEOUT_EXT_DATA(timeout_ext); |
| 831 | else |
| 832 | timeouts = l4proto->get_timeouts(net); |
| 833 | |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 834 | if (!l4proto->new(ct, skb, dataoff, timeouts)) { |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 835 | nf_conntrack_free(ct); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 836 | pr_debug("init conntrack: can't track with proto module\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 837 | return NULL; |
| 838 | } |
| 839 | |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 840 | if (timeout_ext) |
| 841 | nf_ct_timeout_ext_add(ct, timeout_ext->timeout, GFP_ATOMIC); |
| 842 | |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 843 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 844 | nf_ct_tstamp_ext_add(ct, GFP_ATOMIC); |
Florian Westphal | c539f01 | 2013-01-11 06:30:44 +0000 | [diff] [blame] | 845 | nf_ct_labels_ext_add(ct); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 846 | |
| 847 | ecache = tmpl ? nf_ct_ecache_find(tmpl) : NULL; |
| 848 | nf_ct_ecache_ext_add(ct, ecache ? ecache->ctmask : 0, |
| 849 | ecache ? ecache->expmask : 0, |
| 850 | GFP_ATOMIC); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 851 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 852 | spin_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 853 | exp = nf_ct_find_expectation(net, zone, tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 854 | if (exp) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 855 | pr_debug("conntrack: expectation arrives ct=%p exp=%p\n", |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 856 | ct, exp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 857 | /* Welcome, Mr. Bond. We've been expecting you... */ |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 858 | __set_bit(IPS_EXPECTED_BIT, &ct->status); |
| 859 | ct->master = exp->master; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 860 | if (exp->helper) { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 861 | help = nf_ct_helper_ext_add(ct, exp->helper, |
| 862 | GFP_ATOMIC); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 863 | if (help) |
Eric Dumazet | cf778b0 | 2012-01-12 04:41:32 +0000 | [diff] [blame] | 864 | rcu_assign_pointer(help->helper, exp->helper); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 865 | } |
| 866 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 867 | #ifdef CONFIG_NF_CONNTRACK_MARK |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 868 | ct->mark = exp->master->mark; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 869 | #endif |
James Morris | 7c9728c | 2006-06-09 00:31:46 -0700 | [diff] [blame] | 870 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 871 | ct->secmark = exp->master->secmark; |
James Morris | 7c9728c | 2006-06-09 00:31:46 -0700 | [diff] [blame] | 872 | #endif |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 873 | nf_conntrack_get(&ct->master->ct_general); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 874 | NF_CT_STAT_INC(net, expect_new); |
Yasuyuki Kozakai | 22e7410 | 2006-11-27 10:25:59 -0800 | [diff] [blame] | 875 | } else { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 876 | __nf_ct_try_assign_helper(ct, tmpl, GFP_ATOMIC); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 877 | NF_CT_STAT_INC(net, new); |
Yasuyuki Kozakai | 22e7410 | 2006-11-27 10:25:59 -0800 | [diff] [blame] | 878 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 879 | |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 880 | /* Now it is inserted into the unconfirmed list, bump refcount */ |
| 881 | nf_conntrack_get(&ct->ct_general); |
| 882 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 883 | /* Overload tuple linked list to put us in unconfirmed list. */ |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 884 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
Alexey Dobriyan | 63c9a26 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 885 | &net->ct.unconfirmed); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 886 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 887 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 888 | |
| 889 | if (exp) { |
| 890 | if (exp->expectfn) |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 891 | exp->expectfn(ct, exp); |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 892 | nf_ct_expect_put(exp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 893 | } |
| 894 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 895 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 896 | } |
| 897 | |
| 898 | /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ |
| 899 | static inline struct nf_conn * |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 900 | resolve_normal_ct(struct net *net, struct nf_conn *tmpl, |
Alexey Dobriyan | a702a65 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 901 | struct sk_buff *skb, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 902 | unsigned int dataoff, |
| 903 | u_int16_t l3num, |
| 904 | u_int8_t protonum, |
| 905 | struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 906 | struct nf_conntrack_l4proto *l4proto, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 907 | int *set_reply, |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 908 | enum ip_conntrack_info *ctinfo) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 909 | { |
| 910 | struct nf_conntrack_tuple tuple; |
| 911 | struct nf_conntrack_tuple_hash *h; |
| 912 | struct nf_conn *ct; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 913 | u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE; |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 914 | u32 hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 915 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 916 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 917 | dataoff, l3num, protonum, &tuple, l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 918 | l4proto)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 919 | pr_debug("resolve_normal_ct: Can't get tuple\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 920 | return NULL; |
| 921 | } |
| 922 | |
| 923 | /* look for tuple match */ |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 924 | hash = hash_conntrack_raw(&tuple, zone); |
| 925 | h = __nf_conntrack_find_get(net, zone, &tuple, hash); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 926 | if (!h) { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 927 | h = init_conntrack(net, tmpl, &tuple, l3proto, l4proto, |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 928 | skb, dataoff, hash); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 929 | if (!h) |
| 930 | return NULL; |
| 931 | if (IS_ERR(h)) |
| 932 | return (void *)h; |
| 933 | } |
| 934 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 935 | |
| 936 | /* It exists; we have (non-exclusive) reference. */ |
| 937 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 938 | *ctinfo = IP_CT_ESTABLISHED_REPLY; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 939 | /* Please set reply bit if this packet OK */ |
| 940 | *set_reply = 1; |
| 941 | } else { |
| 942 | /* Once we've had two way comms, always ESTABLISHED. */ |
| 943 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 944 | pr_debug("nf_conntrack_in: normal packet for %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 945 | *ctinfo = IP_CT_ESTABLISHED; |
| 946 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 947 | pr_debug("nf_conntrack_in: related packet for %p\n", |
| 948 | ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 949 | *ctinfo = IP_CT_RELATED; |
| 950 | } else { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 951 | pr_debug("nf_conntrack_in: new packet for %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 952 | *ctinfo = IP_CT_NEW; |
| 953 | } |
| 954 | *set_reply = 0; |
| 955 | } |
| 956 | skb->nfct = &ct->ct_general; |
| 957 | skb->nfctinfo = *ctinfo; |
| 958 | return ct; |
| 959 | } |
| 960 | |
| 961 | unsigned int |
Alexey Dobriyan | a702a65 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 962 | nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, |
| 963 | struct sk_buff *skb) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 964 | { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 965 | struct nf_conn *ct, *tmpl = NULL; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 966 | enum ip_conntrack_info ctinfo; |
| 967 | struct nf_conntrack_l3proto *l3proto; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 968 | struct nf_conntrack_l4proto *l4proto; |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 969 | unsigned int *timeouts; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 970 | unsigned int dataoff; |
| 971 | u_int8_t protonum; |
| 972 | int set_reply = 0; |
| 973 | int ret; |
| 974 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 975 | if (skb->nfct) { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 976 | /* Previously seen (loopback or untracked)? Ignore. */ |
| 977 | tmpl = (struct nf_conn *)skb->nfct; |
| 978 | if (!nf_ct_is_template(tmpl)) { |
| 979 | NF_CT_STAT_INC_ATOMIC(net, ignore); |
| 980 | return NF_ACCEPT; |
| 981 | } |
| 982 | skb->nfct = NULL; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 983 | } |
| 984 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 985 | /* rcu_read_lock()ed by nf_hook_slow */ |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 986 | l3proto = __nf_ct_l3proto_find(pf); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 987 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
Yasuyuki Kozakai | ffc3069 | 2007-07-14 20:44:50 -0700 | [diff] [blame] | 988 | &dataoff, &protonum); |
| 989 | if (ret <= 0) { |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 990 | pr_debug("not prepared to track yet or error occurred\n"); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 991 | NF_CT_STAT_INC_ATOMIC(net, error); |
| 992 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 993 | ret = -ret; |
| 994 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 995 | } |
| 996 | |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 997 | l4proto = __nf_ct_l4proto_find(pf, protonum); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 998 | |
| 999 | /* It may be an special packet, error, unclean... |
| 1000 | * inverse of the return code tells to the netfilter |
| 1001 | * core what to do with the packet. */ |
Alexey Dobriyan | 74c51a1 | 2008-10-08 11:35:05 +0200 | [diff] [blame] | 1002 | if (l4proto->error != NULL) { |
Patrick McHardy | 8fea97e | 2010-02-15 17:45:08 +0100 | [diff] [blame] | 1003 | ret = l4proto->error(net, tmpl, skb, dataoff, &ctinfo, |
| 1004 | pf, hooknum); |
Alexey Dobriyan | 74c51a1 | 2008-10-08 11:35:05 +0200 | [diff] [blame] | 1005 | if (ret <= 0) { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1006 | NF_CT_STAT_INC_ATOMIC(net, error); |
| 1007 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1008 | ret = -ret; |
| 1009 | goto out; |
Alexey Dobriyan | 74c51a1 | 2008-10-08 11:35:05 +0200 | [diff] [blame] | 1010 | } |
Pablo Neira Ayuso | 88ed01d | 2011-06-02 15:08:45 +0200 | [diff] [blame] | 1011 | /* ICMP[v6] protocol trackers may assign one conntrack. */ |
| 1012 | if (skb->nfct) |
| 1013 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1014 | } |
| 1015 | |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1016 | ct = resolve_normal_ct(net, tmpl, skb, dataoff, pf, protonum, |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1017 | l3proto, l4proto, &set_reply, &ctinfo); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1018 | if (!ct) { |
| 1019 | /* Not valid part of a connection */ |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1020 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1021 | ret = NF_ACCEPT; |
| 1022 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1023 | } |
| 1024 | |
| 1025 | if (IS_ERR(ct)) { |
| 1026 | /* Too stressed to deal. */ |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1027 | NF_CT_STAT_INC_ATOMIC(net, drop); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1028 | ret = NF_DROP; |
| 1029 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1030 | } |
| 1031 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1032 | NF_CT_ASSERT(skb->nfct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1033 | |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1034 | /* Decide what timeout policy we want to apply to this flow. */ |
Pablo Neira Ayuso | 84b5ee9 | 2012-08-28 00:53:15 +0000 | [diff] [blame] | 1035 | timeouts = nf_ct_timeout_lookup(net, ct, l4proto); |
Pablo Neira Ayuso | 60b5f8f | 2012-03-23 00:04:53 +0100 | [diff] [blame] | 1036 | |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 1037 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum, timeouts); |
Christoph Paasch | ec8d540 | 2009-03-16 15:51:29 +0100 | [diff] [blame] | 1038 | if (ret <= 0) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1039 | /* Invalid: inverse of the return code tells |
| 1040 | * the netfilter core what to do */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1041 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1042 | nf_conntrack_put(skb->nfct); |
| 1043 | skb->nfct = NULL; |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1044 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Pablo Neira Ayuso | 7d1e045 | 2009-02-24 14:48:01 +0100 | [diff] [blame] | 1045 | if (ret == -NF_DROP) |
| 1046 | NF_CT_STAT_INC_ATOMIC(net, drop); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1047 | ret = -ret; |
| 1048 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1049 | } |
| 1050 | |
| 1051 | 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] | 1052 | nf_conntrack_event_cache(IPCT_REPLY, ct); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1053 | out: |
Pablo Neira Ayuso | c317428 | 2011-02-09 08:08:20 +0100 | [diff] [blame] | 1054 | if (tmpl) { |
| 1055 | /* Special case: we have to repeat this hook, assign the |
| 1056 | * template again to this packet. We assume that this packet |
| 1057 | * has no conntrack assigned. This is used by nf_ct_tcp. */ |
| 1058 | if (ret == NF_REPEAT) |
| 1059 | skb->nfct = (struct nf_conntrack *)tmpl; |
| 1060 | else |
| 1061 | nf_ct_put(tmpl); |
| 1062 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1063 | |
| 1064 | return ret; |
| 1065 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1066 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1067 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 1068 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
| 1069 | const struct nf_conntrack_tuple *orig) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1070 | { |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 1071 | bool ret; |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 1072 | |
| 1073 | rcu_read_lock(); |
| 1074 | ret = nf_ct_invert_tuple(inverse, orig, |
| 1075 | __nf_ct_l3proto_find(orig->src.l3num), |
| 1076 | __nf_ct_l4proto_find(orig->src.l3num, |
| 1077 | orig->dst.protonum)); |
| 1078 | rcu_read_unlock(); |
| 1079 | return ret; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1080 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1081 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1082 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1083 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
| 1084 | implicitly racy: see __nf_conntrack_confirm */ |
| 1085 | void nf_conntrack_alter_reply(struct nf_conn *ct, |
| 1086 | const struct nf_conntrack_tuple *newreply) |
| 1087 | { |
| 1088 | struct nf_conn_help *help = nfct_help(ct); |
| 1089 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1090 | /* Should be unconfirmed, so not in hash table yet */ |
| 1091 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
| 1092 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1093 | pr_debug("Altering reply tuple of %p to ", ct); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1094 | nf_ct_dump_tuple(newreply); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1095 | |
| 1096 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; |
Patrick McHardy | ef1a5a5 | 2008-04-14 11:21:01 +0200 | [diff] [blame] | 1097 | if (ct->master || (help && !hlist_empty(&help->expectations))) |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 1098 | return; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 1099 | |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 1100 | rcu_read_lock(); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 1101 | __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC); |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 1102 | rcu_read_unlock(); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1103 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1104 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1105 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1106 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
| 1107 | void __nf_ct_refresh_acct(struct nf_conn *ct, |
| 1108 | enum ip_conntrack_info ctinfo, |
| 1109 | const struct sk_buff *skb, |
| 1110 | unsigned long extra_jiffies, |
| 1111 | int do_acct) |
| 1112 | { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1113 | NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct); |
| 1114 | NF_CT_ASSERT(skb); |
| 1115 | |
Eric Leblond | 997ae83 | 2006-05-29 18:24:20 -0700 | [diff] [blame] | 1116 | /* Only update if this is not a fixed timeout */ |
Patrick McHardy | 47d9504 | 2008-01-31 04:36:31 -0800 | [diff] [blame] | 1117 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
| 1118 | goto acct; |
Eric Leblond | 997ae83 | 2006-05-29 18:24:20 -0700 | [diff] [blame] | 1119 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1120 | /* If not in hash table, timer will not be active yet */ |
| 1121 | if (!nf_ct_is_confirmed(ct)) { |
| 1122 | ct->timeout.expires = extra_jiffies; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1123 | } else { |
Martin Josefsson | be00c8e | 2006-11-29 02:35:12 +0100 | [diff] [blame] | 1124 | unsigned long newtime = jiffies + extra_jiffies; |
| 1125 | |
| 1126 | /* Only update the timeout if the new timeout is at least |
| 1127 | HZ jiffies from the old timeout. Need del_timer for race |
| 1128 | avoidance (may already be dying). */ |
Patrick McHardy | 65cb9fd | 2009-06-13 12:21:49 +0200 | [diff] [blame] | 1129 | if (newtime - ct->timeout.expires >= HZ) |
| 1130 | mod_timer_pending(&ct->timeout, newtime); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1131 | } |
| 1132 | |
Patrick McHardy | 47d9504 | 2008-01-31 04:36:31 -0800 | [diff] [blame] | 1133 | acct: |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1134 | if (do_acct) { |
Holger Eitzenberger | f7b13e4 | 2013-09-26 17:31:51 +0200 | [diff] [blame] | 1135 | struct nf_conn_acct *acct; |
Martin Josefsson | 3ffd5ee | 2006-11-29 02:35:10 +0100 | [diff] [blame] | 1136 | |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1137 | acct = nf_conn_acct_find(ct); |
| 1138 | if (acct) { |
Holger Eitzenberger | f7b13e4 | 2013-09-26 17:31:51 +0200 | [diff] [blame] | 1139 | struct nf_conn_counter *counter = acct->counter; |
| 1140 | |
| 1141 | atomic64_inc(&counter[CTINFO2DIR(ctinfo)].packets); |
| 1142 | atomic64_add(skb->len, &counter[CTINFO2DIR(ctinfo)].bytes); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1143 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1144 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1145 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1146 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1147 | |
David S. Miller | 4c88949 | 2008-07-14 20:22:38 -0700 | [diff] [blame] | 1148 | bool __nf_ct_kill_acct(struct nf_conn *ct, |
| 1149 | enum ip_conntrack_info ctinfo, |
| 1150 | const struct sk_buff *skb, |
| 1151 | int do_acct) |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 1152 | { |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 1153 | if (do_acct) { |
Holger Eitzenberger | f7b13e4 | 2013-09-26 17:31:51 +0200 | [diff] [blame] | 1154 | struct nf_conn_acct *acct; |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1155 | |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1156 | acct = nf_conn_acct_find(ct); |
| 1157 | if (acct) { |
Holger Eitzenberger | f7b13e4 | 2013-09-26 17:31:51 +0200 | [diff] [blame] | 1158 | struct nf_conn_counter *counter = acct->counter; |
| 1159 | |
| 1160 | atomic64_inc(&counter[CTINFO2DIR(ctinfo)].packets); |
Eric Dumazet | b3e0bfa | 2011-12-14 14:45:20 +0100 | [diff] [blame] | 1161 | atomic64_add(skb->len - skb_network_offset(skb), |
Holger Eitzenberger | f7b13e4 | 2013-09-26 17:31:51 +0200 | [diff] [blame] | 1162 | &counter[CTINFO2DIR(ctinfo)].bytes); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1163 | } |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 1164 | } |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1165 | |
David S. Miller | 4c88949 | 2008-07-14 20:22:38 -0700 | [diff] [blame] | 1166 | if (del_timer(&ct->timeout)) { |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 1167 | ct->timeout.function((unsigned long)ct); |
David S. Miller | 4c88949 | 2008-07-14 20:22:38 -0700 | [diff] [blame] | 1168 | return true; |
| 1169 | } |
| 1170 | return false; |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 1171 | } |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 1172 | EXPORT_SYMBOL_GPL(__nf_ct_kill_acct); |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 1173 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1174 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 1175 | static struct nf_ct_ext_type nf_ct_zone_extend __read_mostly = { |
| 1176 | .len = sizeof(struct nf_conntrack_zone), |
| 1177 | .align = __alignof__(struct nf_conntrack_zone), |
| 1178 | .id = NF_CT_EXT_ZONE, |
| 1179 | }; |
| 1180 | #endif |
| 1181 | |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 1182 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1183 | |
| 1184 | #include <linux/netfilter/nfnetlink.h> |
| 1185 | #include <linux/netfilter/nfnetlink_conntrack.h> |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1186 | #include <linux/mutex.h> |
| 1187 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1188 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
| 1189 | * in ip_conntrack_core, since we don't want the protocols to autoload |
| 1190 | * or depend on ctnetlink */ |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 1191 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1192 | const struct nf_conntrack_tuple *tuple) |
| 1193 | { |
David S. Miller | bae65be | 2012-04-01 18:58:28 -0400 | [diff] [blame] | 1194 | if (nla_put_be16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port) || |
| 1195 | nla_put_be16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port)) |
| 1196 | goto nla_put_failure; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1197 | return 0; |
| 1198 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 1199 | nla_put_failure: |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1200 | return -1; |
| 1201 | } |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 1202 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1203 | |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 1204 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
| 1205 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, |
| 1206 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1207 | }; |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 1208 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1209 | |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 1210 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1211 | struct nf_conntrack_tuple *t) |
| 1212 | { |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 1213 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1214 | return -EINVAL; |
| 1215 | |
Patrick McHardy | 77236b6 | 2007-12-17 22:29:45 -0800 | [diff] [blame] | 1216 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
| 1217 | 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] | 1218 | |
| 1219 | return 0; |
| 1220 | } |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 1221 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
Holger Eitzenberger | 5c0de29 | 2009-03-25 21:52:17 +0100 | [diff] [blame] | 1222 | |
| 1223 | int nf_ct_port_nlattr_tuple_size(void) |
| 1224 | { |
| 1225 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); |
| 1226 | } |
| 1227 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1228 | #endif |
| 1229 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1230 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
Patrick McHardy | 312a0c16 | 2013-07-28 22:54:08 +0200 | [diff] [blame] | 1231 | 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] | 1232 | { |
| 1233 | struct nf_conn *ct; |
| 1234 | enum ip_conntrack_info ctinfo; |
| 1235 | |
| 1236 | /* This ICMP is in reverse direction to the packet which caused it */ |
| 1237 | ct = nf_ct_get(skb, &ctinfo); |
| 1238 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 1239 | ctinfo = IP_CT_RELATED_REPLY; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1240 | else |
| 1241 | ctinfo = IP_CT_RELATED; |
| 1242 | |
| 1243 | /* Attach to new skbuff, and increment count */ |
| 1244 | nskb->nfct = &ct->ct_general; |
| 1245 | nskb->nfctinfo = ctinfo; |
| 1246 | nf_conntrack_get(nskb->nfct); |
| 1247 | } |
| 1248 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1249 | /* Bring out ya dead! */ |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1250 | static struct nf_conn * |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1251 | 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] | 1252 | void *data, unsigned int *bucket) |
| 1253 | { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1254 | struct nf_conntrack_tuple_hash *h; |
| 1255 | struct nf_conn *ct; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1256 | struct hlist_nulls_node *n; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1257 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1258 | spin_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1259 | for (; *bucket < net->ct.htable_size; (*bucket)++) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1260 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) { |
Patrick McHardy | b0cdb1d | 2012-09-19 20:57:04 +0000 | [diff] [blame] | 1261 | if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
| 1262 | continue; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1263 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 1264 | if (iter(ct, data)) |
| 1265 | goto found; |
| 1266 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1267 | } |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1268 | hlist_nulls_for_each_entry(h, n, &net->ct.unconfirmed, hnnode) { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1269 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 1270 | if (iter(ct, data)) |
Patrick McHardy | ec68e97 | 2007-03-04 15:57:01 -0800 | [diff] [blame] | 1271 | set_bit(IPS_DYING_BIT, &ct->status); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1272 | } |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1273 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1274 | return NULL; |
| 1275 | found: |
Martin Josefsson | c073e3f | 2006-10-30 15:13:58 -0800 | [diff] [blame] | 1276 | atomic_inc(&ct->ct_general.use); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1277 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1278 | return ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1279 | } |
| 1280 | |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1281 | void nf_ct_iterate_cleanup(struct net *net, |
| 1282 | int (*iter)(struct nf_conn *i, void *data), |
Florian Westphal | c655bc6 | 2013-07-29 15:41:55 +0200 | [diff] [blame] | 1283 | void *data, u32 portid, int report) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1284 | { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1285 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1286 | unsigned int bucket = 0; |
| 1287 | |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1288 | while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1289 | /* Time to push up daises... */ |
| 1290 | if (del_timer(&ct->timeout)) |
Florian Westphal | c655bc6 | 2013-07-29 15:41:55 +0200 | [diff] [blame] | 1291 | nf_ct_delete(ct, portid, report); |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 1292 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1293 | /* ... else the timer will get him soon. */ |
| 1294 | |
| 1295 | nf_ct_put(ct); |
| 1296 | } |
| 1297 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1298 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1299 | |
Pablo Neira Ayuso | 274d383 | 2009-06-02 20:08:38 +0200 | [diff] [blame] | 1300 | static int kill_all(struct nf_conn *i, void *data) |
| 1301 | { |
| 1302 | return 1; |
| 1303 | } |
| 1304 | |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1305 | void nf_ct_free_hashtable(void *hash, unsigned int size) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1306 | { |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1307 | if (is_vmalloc_addr(hash)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1308 | vfree(hash); |
| 1309 | else |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1310 | free_pages((unsigned long)hash, |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1311 | get_order(sizeof(struct hlist_head) * size)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1312 | } |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1313 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1314 | |
Patrick McHardy | ec464e5 | 2013-04-17 06:47:08 +0000 | [diff] [blame] | 1315 | void nf_conntrack_flush_report(struct net *net, u32 portid, int report) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1316 | { |
Florian Westphal | c655bc6 | 2013-07-29 15:41:55 +0200 | [diff] [blame] | 1317 | nf_ct_iterate_cleanup(net, kill_all, NULL, portid, report); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1318 | } |
Pablo Neira Ayuso | 274d383 | 2009-06-02 20:08:38 +0200 | [diff] [blame] | 1319 | EXPORT_SYMBOL_GPL(nf_conntrack_flush_report); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1320 | |
Alexey Dobriyan | ee254fa | 2009-08-31 14:23:15 +0200 | [diff] [blame] | 1321 | static void nf_ct_release_dying_list(struct net *net) |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 1322 | { |
| 1323 | struct nf_conntrack_tuple_hash *h; |
| 1324 | struct nf_conn *ct; |
| 1325 | struct hlist_nulls_node *n; |
| 1326 | |
| 1327 | spin_lock_bh(&nf_conntrack_lock); |
Alexey Dobriyan | ee254fa | 2009-08-31 14:23:15 +0200 | [diff] [blame] | 1328 | hlist_nulls_for_each_entry(h, n, &net->ct.dying, hnnode) { |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 1329 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 1330 | /* never fails to remove them, no listeners at this point */ |
| 1331 | nf_ct_kill(ct); |
| 1332 | } |
| 1333 | spin_unlock_bh(&nf_conntrack_lock); |
| 1334 | } |
| 1335 | |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1336 | static int untrack_refs(void) |
| 1337 | { |
| 1338 | int cnt = 0, cpu; |
| 1339 | |
| 1340 | for_each_possible_cpu(cpu) { |
| 1341 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); |
| 1342 | |
| 1343 | cnt += atomic_read(&ct->ct_general.use) - 1; |
| 1344 | } |
| 1345 | return cnt; |
| 1346 | } |
| 1347 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1348 | void nf_conntrack_cleanup_start(void) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1349 | { |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1350 | RCU_INIT_POINTER(ip_ct_attach, NULL); |
| 1351 | } |
| 1352 | |
| 1353 | void nf_conntrack_cleanup_end(void) |
| 1354 | { |
| 1355 | RCU_INIT_POINTER(nf_ct_destroy, NULL); |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1356 | while (untrack_refs() > 0) |
Patrick McHardy | 9edd7ca | 2010-02-08 11:16:26 -0800 | [diff] [blame] | 1357 | schedule(); |
| 1358 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1359 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 1360 | nf_ct_extend_unregister(&nf_ct_zone_extend); |
| 1361 | #endif |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1362 | nf_conntrack_proto_fini(); |
Patrick McHardy | 41d73ec | 2013-08-27 08:50:12 +0200 | [diff] [blame] | 1363 | nf_conntrack_seqadj_fini(); |
Gao feng | 5f69b8f | 2013-01-21 22:10:31 +0000 | [diff] [blame] | 1364 | nf_conntrack_labels_fini(); |
Gao feng | 5e615b2 | 2013-01-21 22:10:30 +0000 | [diff] [blame] | 1365 | nf_conntrack_helper_fini(); |
Gao feng | 8684094 | 2013-01-21 22:10:29 +0000 | [diff] [blame] | 1366 | nf_conntrack_timeout_fini(); |
Gao feng | 3fe0f94 | 2013-01-21 22:10:28 +0000 | [diff] [blame] | 1367 | nf_conntrack_ecache_fini(); |
Gao feng | 73f4001 | 2013-01-21 22:10:27 +0000 | [diff] [blame] | 1368 | nf_conntrack_tstamp_fini(); |
Gao feng | b7ff3a1 | 2013-01-21 22:10:26 +0000 | [diff] [blame] | 1369 | nf_conntrack_acct_fini(); |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 1370 | nf_conntrack_expect_fini(); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1371 | } |
Yasuyuki Kozakai | 7d3cdc6 | 2006-02-15 15:22:21 -0800 | [diff] [blame] | 1372 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1373 | /* |
| 1374 | * Mishearing the voices in his head, our hero wonders how he's |
| 1375 | * supposed to kill the mall. |
| 1376 | */ |
| 1377 | void nf_conntrack_cleanup_net(struct net *net) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1378 | { |
Vladimir Davydov | dece40e | 2013-03-13 23:40:14 +0000 | [diff] [blame] | 1379 | LIST_HEAD(single); |
| 1380 | |
| 1381 | list_add(&net->exit_list, &single); |
| 1382 | nf_conntrack_cleanup_net_list(&single); |
| 1383 | } |
| 1384 | |
| 1385 | void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list) |
| 1386 | { |
| 1387 | int busy; |
| 1388 | struct net *net; |
| 1389 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1390 | /* |
| 1391 | * This makes sure all current packets have passed through |
| 1392 | * netfilter framework. Roll on, two-stage module |
| 1393 | * delete... |
| 1394 | */ |
| 1395 | synchronize_net(); |
Vladimir Davydov | dece40e | 2013-03-13 23:40:14 +0000 | [diff] [blame] | 1396 | i_see_dead_people: |
| 1397 | busy = 0; |
| 1398 | list_for_each_entry(net, net_exit_list, exit_list) { |
Florian Westphal | c655bc6 | 2013-07-29 15:41:55 +0200 | [diff] [blame] | 1399 | nf_ct_iterate_cleanup(net, kill_all, NULL, 0, 0); |
Vladimir Davydov | dece40e | 2013-03-13 23:40:14 +0000 | [diff] [blame] | 1400 | nf_ct_release_dying_list(net); |
| 1401 | if (atomic_read(&net->ct.count) != 0) |
| 1402 | busy = 1; |
| 1403 | } |
| 1404 | if (busy) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1405 | schedule(); |
| 1406 | goto i_see_dead_people; |
| 1407 | } |
| 1408 | |
Vladimir Davydov | dece40e | 2013-03-13 23:40:14 +0000 | [diff] [blame] | 1409 | list_for_each_entry(net, net_exit_list, exit_list) { |
| 1410 | nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size); |
| 1411 | nf_conntrack_proto_pernet_fini(net); |
| 1412 | nf_conntrack_helper_pernet_fini(net); |
| 1413 | nf_conntrack_ecache_pernet_fini(net); |
| 1414 | nf_conntrack_tstamp_pernet_fini(net); |
| 1415 | nf_conntrack_acct_pernet_fini(net); |
| 1416 | nf_conntrack_expect_pernet_fini(net); |
| 1417 | kmem_cache_destroy(net->ct.nf_conntrack_cachep); |
| 1418 | kfree(net->ct.slabname); |
| 1419 | free_percpu(net->ct.stat); |
| 1420 | } |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1421 | } |
| 1422 | |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1423 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1424 | { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1425 | struct hlist_nulls_head *hash; |
| 1426 | unsigned int nr_slots, i; |
| 1427 | size_t sz; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1428 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1429 | BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); |
| 1430 | nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); |
| 1431 | sz = nr_slots * sizeof(struct hlist_nulls_head); |
| 1432 | hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, |
| 1433 | get_order(sz)); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1434 | if (!hash) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1435 | printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n"); |
Eric Dumazet | 966567b | 2011-12-19 16:01:38 -0500 | [diff] [blame] | 1436 | hash = vzalloc(sz); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1437 | } |
| 1438 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1439 | if (hash && nulls) |
| 1440 | for (i = 0; i < nr_slots; i++) |
| 1441 | INIT_HLIST_NULLS_HEAD(&hash[i], i); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1442 | |
| 1443 | return hash; |
| 1444 | } |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1445 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1446 | |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1447 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1448 | { |
Abhijit Pawar | 4b5511e | 2012-12-09 23:12:28 +0000 | [diff] [blame] | 1449 | int i, bucket, rc; |
Stephen Hemminger | 96eb24d | 2008-01-31 04:07:29 -0800 | [diff] [blame] | 1450 | unsigned int hashsize, old_size; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1451 | struct hlist_nulls_head *hash, *old_hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1452 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1453 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1454 | |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1455 | if (current->nsproxy->net_ns != &init_net) |
| 1456 | return -EOPNOTSUPP; |
| 1457 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1458 | /* On boot, we can set this without any fancy locking. */ |
| 1459 | if (!nf_conntrack_htable_size) |
| 1460 | return param_set_uint(val, kp); |
| 1461 | |
Abhijit Pawar | 4b5511e | 2012-12-09 23:12:28 +0000 | [diff] [blame] | 1462 | rc = kstrtouint(val, 0, &hashsize); |
| 1463 | if (rc) |
| 1464 | return rc; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1465 | if (!hashsize) |
| 1466 | return -EINVAL; |
| 1467 | |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1468 | hash = nf_ct_alloc_hashtable(&hashsize, 1); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1469 | if (!hash) |
| 1470 | return -ENOMEM; |
| 1471 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 1472 | /* Lookups in the old hash might happen in parallel, which means we |
| 1473 | * might get false negatives during connection lookup. New connections |
| 1474 | * created because of a false negative won't make it into the hash |
| 1475 | * though since that required taking the lock. |
| 1476 | */ |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1477 | spin_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1478 | for (i = 0; i < init_net.ct.htable_size; i++) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1479 | while (!hlist_nulls_empty(&init_net.ct.hash[i])) { |
| 1480 | h = hlist_nulls_entry(init_net.ct.hash[i].first, |
| 1481 | struct nf_conntrack_tuple_hash, hnnode); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1482 | ct = nf_ct_tuplehash_to_ctrack(h); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1483 | hlist_nulls_del_rcu(&h->hnnode); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1484 | bucket = __hash_conntrack(&h->tuple, nf_ct_zone(ct), |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 1485 | hashsize); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1486 | hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1487 | } |
| 1488 | } |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1489 | old_size = init_net.ct.htable_size; |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1490 | old_hash = init_net.ct.hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1491 | |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1492 | init_net.ct.htable_size = nf_conntrack_htable_size = hashsize; |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1493 | init_net.ct.hash = hash; |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1494 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1495 | |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1496 | nf_ct_free_hashtable(old_hash, old_size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1497 | return 0; |
| 1498 | } |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1499 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1500 | |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1501 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1502 | &nf_conntrack_htable_size, 0600); |
| 1503 | |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 1504 | void nf_ct_untracked_status_or(unsigned long bits) |
| 1505 | { |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1506 | int cpu; |
| 1507 | |
| 1508 | for_each_possible_cpu(cpu) |
| 1509 | per_cpu(nf_conntrack_untracked, cpu).status |= bits; |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 1510 | } |
| 1511 | EXPORT_SYMBOL_GPL(nf_ct_untracked_status_or); |
| 1512 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1513 | int nf_conntrack_init_start(void) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1514 | { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1515 | int max_factor = 8; |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1516 | int ret, cpu; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1517 | |
| 1518 | /* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1519 | * machine has 512 buckets. >= 1GB machines have 16384 buckets. */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1520 | if (!nf_conntrack_htable_size) { |
| 1521 | nf_conntrack_htable_size |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 1522 | = (((totalram_pages << PAGE_SHIFT) / 16384) |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1523 | / sizeof(struct hlist_head)); |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 1524 | if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1525 | nf_conntrack_htable_size = 16384; |
| 1526 | if (nf_conntrack_htable_size < 32) |
| 1527 | nf_conntrack_htable_size = 32; |
| 1528 | |
| 1529 | /* Use a max. factor of four by default to get the same max as |
| 1530 | * with the old struct list_heads. When a table size is given |
| 1531 | * we use the old value of 8 to avoid reducing the max. |
| 1532 | * entries. */ |
| 1533 | max_factor = 4; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1534 | } |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1535 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 1536 | |
Stephen Hemminger | 654d0fb | 2010-05-13 15:02:08 +0200 | [diff] [blame] | 1537 | printk(KERN_INFO "nf_conntrack version %s (%u buckets, %d max)\n", |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 1538 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, |
| 1539 | nf_conntrack_max); |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 1540 | |
| 1541 | ret = nf_conntrack_expect_init(); |
| 1542 | if (ret < 0) |
| 1543 | goto err_expect; |
| 1544 | |
Gao feng | b7ff3a1 | 2013-01-21 22:10:26 +0000 | [diff] [blame] | 1545 | ret = nf_conntrack_acct_init(); |
| 1546 | if (ret < 0) |
| 1547 | goto err_acct; |
| 1548 | |
Gao feng | 73f4001 | 2013-01-21 22:10:27 +0000 | [diff] [blame] | 1549 | ret = nf_conntrack_tstamp_init(); |
| 1550 | if (ret < 0) |
| 1551 | goto err_tstamp; |
| 1552 | |
Gao feng | 3fe0f94 | 2013-01-21 22:10:28 +0000 | [diff] [blame] | 1553 | ret = nf_conntrack_ecache_init(); |
| 1554 | if (ret < 0) |
| 1555 | goto err_ecache; |
| 1556 | |
Gao feng | 8684094 | 2013-01-21 22:10:29 +0000 | [diff] [blame] | 1557 | ret = nf_conntrack_timeout_init(); |
| 1558 | if (ret < 0) |
| 1559 | goto err_timeout; |
| 1560 | |
Gao feng | 5e615b2 | 2013-01-21 22:10:30 +0000 | [diff] [blame] | 1561 | ret = nf_conntrack_helper_init(); |
| 1562 | if (ret < 0) |
| 1563 | goto err_helper; |
| 1564 | |
Gao feng | 5f69b8f | 2013-01-21 22:10:31 +0000 | [diff] [blame] | 1565 | ret = nf_conntrack_labels_init(); |
| 1566 | if (ret < 0) |
| 1567 | goto err_labels; |
| 1568 | |
Patrick McHardy | 41d73ec | 2013-08-27 08:50:12 +0200 | [diff] [blame] | 1569 | ret = nf_conntrack_seqadj_init(); |
| 1570 | if (ret < 0) |
| 1571 | goto err_seqadj; |
| 1572 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1573 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 1574 | ret = nf_ct_extend_register(&nf_ct_zone_extend); |
| 1575 | if (ret < 0) |
| 1576 | goto err_extend; |
| 1577 | #endif |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1578 | ret = nf_conntrack_proto_init(); |
| 1579 | if (ret < 0) |
| 1580 | goto err_proto; |
| 1581 | |
Patrick McHardy | 9edd7ca | 2010-02-08 11:16:26 -0800 | [diff] [blame] | 1582 | /* Set up fake conntrack: to never be deleted, not in any hashes */ |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1583 | for_each_possible_cpu(cpu) { |
| 1584 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1585 | write_pnet(&ct->ct_net, &init_net); |
| 1586 | atomic_set(&ct->ct_general.use, 1); |
| 1587 | } |
Patrick McHardy | 9edd7ca | 2010-02-08 11:16:26 -0800 | [diff] [blame] | 1588 | /* - and look it like as a confirmed connection */ |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 1589 | nf_ct_untracked_status_or(IPS_CONFIRMED | IPS_UNTRACKED); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1590 | return 0; |
| 1591 | |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1592 | err_proto: |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1593 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1594 | nf_ct_extend_unregister(&nf_ct_zone_extend); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1595 | err_extend: |
Eric Leblond | a900689 | 2012-04-18 11:20:41 +0200 | [diff] [blame] | 1596 | #endif |
Patrick McHardy | 41d73ec | 2013-08-27 08:50:12 +0200 | [diff] [blame] | 1597 | nf_conntrack_seqadj_fini(); |
| 1598 | err_seqadj: |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1599 | nf_conntrack_labels_fini(); |
Gao feng | 5f69b8f | 2013-01-21 22:10:31 +0000 | [diff] [blame] | 1600 | err_labels: |
| 1601 | nf_conntrack_helper_fini(); |
Gao feng | 5e615b2 | 2013-01-21 22:10:30 +0000 | [diff] [blame] | 1602 | err_helper: |
| 1603 | nf_conntrack_timeout_fini(); |
Gao feng | 8684094 | 2013-01-21 22:10:29 +0000 | [diff] [blame] | 1604 | err_timeout: |
| 1605 | nf_conntrack_ecache_fini(); |
Gao feng | 3fe0f94 | 2013-01-21 22:10:28 +0000 | [diff] [blame] | 1606 | err_ecache: |
| 1607 | nf_conntrack_tstamp_fini(); |
Gao feng | 73f4001 | 2013-01-21 22:10:27 +0000 | [diff] [blame] | 1608 | err_tstamp: |
| 1609 | nf_conntrack_acct_fini(); |
Gao feng | b7ff3a1 | 2013-01-21 22:10:26 +0000 | [diff] [blame] | 1610 | err_acct: |
| 1611 | nf_conntrack_expect_fini(); |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 1612 | err_expect: |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1613 | return ret; |
| 1614 | } |
| 1615 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1616 | void nf_conntrack_init_end(void) |
| 1617 | { |
| 1618 | /* For use by REJECT target */ |
| 1619 | RCU_INIT_POINTER(ip_ct_attach, nf_conntrack_attach); |
| 1620 | RCU_INIT_POINTER(nf_ct_destroy, destroy_conntrack); |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1621 | } |
| 1622 | |
Eric Dumazet | 8cc2019 | 2009-06-22 14:13:55 +0200 | [diff] [blame] | 1623 | /* |
| 1624 | * We need to use special "null" values, not used in hash table |
| 1625 | */ |
| 1626 | #define UNCONFIRMED_NULLS_VAL ((1<<30)+0) |
| 1627 | #define DYING_NULLS_VAL ((1<<30)+1) |
Pablo Neira Ayuso | 252b3e8 | 2012-12-11 04:07:42 +0000 | [diff] [blame] | 1628 | #define TEMPLATE_NULLS_VAL ((1<<30)+2) |
Eric Dumazet | 8cc2019 | 2009-06-22 14:13:55 +0200 | [diff] [blame] | 1629 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1630 | int nf_conntrack_init_net(struct net *net) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1631 | { |
| 1632 | int ret; |
| 1633 | |
| 1634 | atomic_set(&net->ct.count, 0); |
Eric Dumazet | 8cc2019 | 2009-06-22 14:13:55 +0200 | [diff] [blame] | 1635 | INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, UNCONFIRMED_NULLS_VAL); |
| 1636 | INIT_HLIST_NULLS_HEAD(&net->ct.dying, DYING_NULLS_VAL); |
Pablo Neira Ayuso | 252b3e8 | 2012-12-11 04:07:42 +0000 | [diff] [blame] | 1637 | INIT_HLIST_NULLS_HEAD(&net->ct.tmpl, TEMPLATE_NULLS_VAL); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1638 | net->ct.stat = alloc_percpu(struct ip_conntrack_stat); |
| 1639 | if (!net->ct.stat) { |
| 1640 | ret = -ENOMEM; |
| 1641 | goto err_stat; |
| 1642 | } |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 1643 | |
| 1644 | net->ct.slabname = kasprintf(GFP_KERNEL, "nf_conntrack_%p", net); |
| 1645 | if (!net->ct.slabname) { |
| 1646 | ret = -ENOMEM; |
| 1647 | goto err_slabname; |
| 1648 | } |
| 1649 | |
| 1650 | net->ct.nf_conntrack_cachep = kmem_cache_create(net->ct.slabname, |
| 1651 | sizeof(struct nf_conn), 0, |
| 1652 | SLAB_DESTROY_BY_RCU, NULL); |
| 1653 | if (!net->ct.nf_conntrack_cachep) { |
| 1654 | printk(KERN_ERR "Unable to create nf_conn slab cache\n"); |
| 1655 | ret = -ENOMEM; |
| 1656 | goto err_cache; |
| 1657 | } |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1658 | |
| 1659 | net->ct.htable_size = nf_conntrack_htable_size; |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1660 | net->ct.hash = nf_ct_alloc_hashtable(&net->ct.htable_size, 1); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1661 | if (!net->ct.hash) { |
| 1662 | ret = -ENOMEM; |
| 1663 | printk(KERN_ERR "Unable to create nf_conntrack_hash\n"); |
| 1664 | goto err_hash; |
| 1665 | } |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 1666 | ret = nf_conntrack_expect_pernet_init(net); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1667 | if (ret < 0) |
| 1668 | goto err_expect; |
Gao feng | b7ff3a1 | 2013-01-21 22:10:26 +0000 | [diff] [blame] | 1669 | ret = nf_conntrack_acct_pernet_init(net); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1670 | if (ret < 0) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1671 | goto err_acct; |
Gao feng | 73f4001 | 2013-01-21 22:10:27 +0000 | [diff] [blame] | 1672 | ret = nf_conntrack_tstamp_pernet_init(net); |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 1673 | if (ret < 0) |
| 1674 | goto err_tstamp; |
Gao feng | 3fe0f94 | 2013-01-21 22:10:28 +0000 | [diff] [blame] | 1675 | ret = nf_conntrack_ecache_pernet_init(net); |
Pablo Neira Ayuso | a0891aa | 2009-06-13 12:26:29 +0200 | [diff] [blame] | 1676 | if (ret < 0) |
| 1677 | goto err_ecache; |
Gao feng | 5e615b2 | 2013-01-21 22:10:30 +0000 | [diff] [blame] | 1678 | ret = nf_conntrack_helper_pernet_init(net); |
Eric Leblond | a900689 | 2012-04-18 11:20:41 +0200 | [diff] [blame] | 1679 | if (ret < 0) |
| 1680 | goto err_helper; |
Gao feng | 04d8700 | 2013-01-21 22:10:32 +0000 | [diff] [blame] | 1681 | ret = nf_conntrack_proto_pernet_init(net); |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1682 | if (ret < 0) |
| 1683 | goto err_proto; |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1684 | return 0; |
Florian Westphal | c539f01 | 2013-01-11 06:30:44 +0000 | [diff] [blame] | 1685 | |
Gao feng | f94161c | 2013-01-21 22:10:24 +0000 | [diff] [blame] | 1686 | err_proto: |
Gao feng | 5e615b2 | 2013-01-21 22:10:30 +0000 | [diff] [blame] | 1687 | nf_conntrack_helper_pernet_fini(net); |
Eric Leblond | a900689 | 2012-04-18 11:20:41 +0200 | [diff] [blame] | 1688 | err_helper: |
Gao feng | 3fe0f94 | 2013-01-21 22:10:28 +0000 | [diff] [blame] | 1689 | nf_conntrack_ecache_pernet_fini(net); |
Pablo Neira Ayuso | a0891aa | 2009-06-13 12:26:29 +0200 | [diff] [blame] | 1690 | err_ecache: |
Gao feng | 73f4001 | 2013-01-21 22:10:27 +0000 | [diff] [blame] | 1691 | nf_conntrack_tstamp_pernet_fini(net); |
Pablo Neira Ayuso | a992ca2 | 2011-01-19 16:00:07 +0100 | [diff] [blame] | 1692 | err_tstamp: |
Gao feng | b7ff3a1 | 2013-01-21 22:10:26 +0000 | [diff] [blame] | 1693 | nf_conntrack_acct_pernet_fini(net); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1694 | err_acct: |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 1695 | nf_conntrack_expect_pernet_fini(net); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1696 | err_expect: |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 1697 | nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size); |
Alexey Dobriyan | 6058fa6 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1698 | err_hash: |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 1699 | kmem_cache_destroy(net->ct.nf_conntrack_cachep); |
| 1700 | err_cache: |
| 1701 | kfree(net->ct.slabname); |
| 1702 | err_slabname: |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1703 | free_percpu(net->ct.stat); |
| 1704 | err_stat: |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1705 | return ret; |
| 1706 | } |