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> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 12 | */ |
| 13 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 14 | #include <linux/types.h> |
| 15 | #include <linux/netfilter.h> |
| 16 | #include <linux/module.h> |
Alexey Dobriyan | d43c36d | 2009-10-07 17:09:06 +0400 | [diff] [blame] | 17 | #include <linux/sched.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 18 | #include <linux/skbuff.h> |
| 19 | #include <linux/proc_fs.h> |
| 20 | #include <linux/vmalloc.h> |
| 21 | #include <linux/stddef.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/random.h> |
| 24 | #include <linux/jhash.h> |
| 25 | #include <linux/err.h> |
| 26 | #include <linux/percpu.h> |
| 27 | #include <linux/moduleparam.h> |
| 28 | #include <linux/notifier.h> |
| 29 | #include <linux/kernel.h> |
| 30 | #include <linux/netdevice.h> |
| 31 | #include <linux/socket.h> |
Al Viro | d7fe0f2 | 2006-12-03 23:15:30 -0500 | [diff] [blame] | 32 | #include <linux/mm.h> |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 33 | #include <linux/nsproxy.h> |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 34 | #include <linux/rculist_nulls.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 35 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 36 | #include <net/netfilter/nf_conntrack.h> |
| 37 | #include <net/netfilter/nf_conntrack_l3proto.h> |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 38 | #include <net/netfilter/nf_conntrack_l4proto.h> |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 39 | #include <net/netfilter/nf_conntrack_expect.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 40 | #include <net/netfilter/nf_conntrack_helper.h> |
| 41 | #include <net/netfilter/nf_conntrack_core.h> |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 42 | #include <net/netfilter/nf_conntrack_extend.h> |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 43 | #include <net/netfilter/nf_conntrack_acct.h> |
Pablo Neira Ayuso | a0891aa | 2009-06-13 12:26:29 +0200 | [diff] [blame] | 44 | #include <net/netfilter/nf_conntrack_ecache.h> |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 45 | #include <net/netfilter/nf_conntrack_zones.h> |
Pablo Neira Ayuso | e6a7d3c | 2008-10-14 11:58:31 -0700 | [diff] [blame] | 46 | #include <net/netfilter/nf_nat.h> |
Patrick McHardy | e17b666 | 2008-11-18 12:24:17 +0100 | [diff] [blame] | 47 | #include <net/netfilter/nf_nat_core.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 48 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 49 | #define NF_CONNTRACK_VERSION "0.5.0" |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 50 | |
Patrick McHardy | e17b666 | 2008-11-18 12:24:17 +0100 | [diff] [blame] | 51 | int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct, |
| 52 | enum nf_nat_manip_type manip, |
Patrick McHardy | 3993832 | 2009-08-25 16:07:58 +0200 | [diff] [blame] | 53 | const struct nlattr *attr) __read_mostly; |
Pablo Neira Ayuso | e6a7d3c | 2008-10-14 11:58:31 -0700 | [diff] [blame] | 54 | EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook); |
| 55 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 56 | DEFINE_SPINLOCK(nf_conntrack_lock); |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 57 | EXPORT_SYMBOL_GPL(nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 58 | |
Martin Josefsson | e2b7606 | 2006-11-29 02:35:04 +0100 | [diff] [blame] | 59 | unsigned int nf_conntrack_htable_size __read_mostly; |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 60 | EXPORT_SYMBOL_GPL(nf_conntrack_htable_size); |
| 61 | |
Hagen Paul Pfeifer | e478075 | 2009-02-20 10:47:09 +0100 | [diff] [blame] | 62 | unsigned int nf_conntrack_max __read_mostly; |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 63 | EXPORT_SYMBOL_GPL(nf_conntrack_max); |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 64 | |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 65 | DEFINE_PER_CPU(struct nf_conn, nf_conntrack_untracked); |
| 66 | EXPORT_PER_CPU_SYMBOL(nf_conntrack_untracked); |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 67 | |
Changli Gao | b239096 | 2010-09-16 19:55:03 +0200 | [diff] [blame] | 68 | static unsigned int nf_conntrack_hash_rnd __read_mostly; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 69 | |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 70 | 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] | 71 | { |
Patrick McHardy | 0794935 | 2008-01-31 04:40:52 -0800 | [diff] [blame] | 72 | unsigned int n; |
Sami Farin | 9b88790 | 2007-03-14 16:43:00 -0700 | [diff] [blame] | 73 | |
Patrick McHardy | 0794935 | 2008-01-31 04:40:52 -0800 | [diff] [blame] | 74 | /* The direction must be ignored, so we hash everything up to the |
| 75 | * destination ports (which is a multiple of 4) and treat the last |
| 76 | * three bytes manually. |
| 77 | */ |
| 78 | n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32); |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 79 | return jhash2((u32 *)tuple, n, zone ^ nf_conntrack_hash_rnd ^ |
| 80 | (((__force __u16)tuple->dst.u.all << 16) | |
| 81 | tuple->dst.protonum)); |
| 82 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 83 | |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 84 | static u32 __hash_bucket(u32 hash, unsigned int size) |
| 85 | { |
| 86 | return ((u64)hash * size) >> 32; |
| 87 | } |
| 88 | |
| 89 | static u32 hash_bucket(u32 hash, const struct net *net) |
| 90 | { |
| 91 | return __hash_bucket(hash, net->ct.htable_size); |
| 92 | } |
| 93 | |
| 94 | static u_int32_t __hash_conntrack(const struct nf_conntrack_tuple *tuple, |
| 95 | u16 zone, unsigned int size) |
| 96 | { |
| 97 | return __hash_bucket(hash_conntrack_raw(tuple, zone), size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 98 | } |
| 99 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 100 | 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] | 101 | const struct nf_conntrack_tuple *tuple) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 102 | { |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 103 | return __hash_conntrack(tuple, zone, net->ct.htable_size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 104 | } |
| 105 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 106 | bool |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 107 | nf_ct_get_tuple(const struct sk_buff *skb, |
| 108 | unsigned int nhoff, |
| 109 | unsigned int dataoff, |
| 110 | u_int16_t l3num, |
| 111 | u_int8_t protonum, |
| 112 | struct nf_conntrack_tuple *tuple, |
| 113 | const struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 114 | const struct nf_conntrack_l4proto *l4proto) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 115 | { |
Philip Craig | 443a70d | 2008-04-29 03:35:10 -0700 | [diff] [blame] | 116 | memset(tuple, 0, sizeof(*tuple)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 117 | |
| 118 | tuple->src.l3num = l3num; |
| 119 | if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0) |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 120 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 121 | |
| 122 | tuple->dst.protonum = protonum; |
| 123 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; |
| 124 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 125 | return l4proto->pkt_to_tuple(skb, dataoff, tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 126 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 127 | EXPORT_SYMBOL_GPL(nf_ct_get_tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 128 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 129 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
| 130 | u_int16_t l3num, struct nf_conntrack_tuple *tuple) |
Yasuyuki Kozakai | e2a3123 | 2007-07-14 20:45:14 -0700 | [diff] [blame] | 131 | { |
| 132 | struct nf_conntrack_l3proto *l3proto; |
| 133 | struct nf_conntrack_l4proto *l4proto; |
| 134 | unsigned int protoff; |
| 135 | u_int8_t protonum; |
| 136 | int ret; |
| 137 | |
| 138 | rcu_read_lock(); |
| 139 | |
| 140 | l3proto = __nf_ct_l3proto_find(l3num); |
| 141 | ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum); |
| 142 | if (ret != NF_ACCEPT) { |
| 143 | rcu_read_unlock(); |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 144 | return false; |
Yasuyuki Kozakai | e2a3123 | 2007-07-14 20:45:14 -0700 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | l4proto = __nf_ct_l4proto_find(l3num, protonum); |
| 148 | |
| 149 | ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, tuple, |
| 150 | l3proto, l4proto); |
| 151 | |
| 152 | rcu_read_unlock(); |
| 153 | return ret; |
| 154 | } |
| 155 | EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); |
| 156 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 157 | bool |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 158 | nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, |
| 159 | const struct nf_conntrack_tuple *orig, |
| 160 | const struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 161 | const struct nf_conntrack_l4proto *l4proto) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 162 | { |
Philip Craig | 443a70d | 2008-04-29 03:35:10 -0700 | [diff] [blame] | 163 | memset(inverse, 0, sizeof(*inverse)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 164 | |
| 165 | inverse->src.l3num = orig->src.l3num; |
| 166 | if (l3proto->invert_tuple(inverse, orig) == 0) |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 167 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 168 | |
| 169 | inverse->dst.dir = !orig->dst.dir; |
| 170 | |
| 171 | inverse->dst.protonum = orig->dst.protonum; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 172 | return l4proto->invert_tuple(inverse, orig); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 173 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 174 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 175 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 176 | static void |
| 177 | clean_from_lists(struct nf_conn *ct) |
| 178 | { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 179 | pr_debug("clean_from_lists(%p)\n", ct); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 180 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
| 181 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 182 | |
| 183 | /* Destroy all pending expectations */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 184 | nf_ct_remove_expectations(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | static void |
| 188 | destroy_conntrack(struct nf_conntrack *nfct) |
| 189 | { |
| 190 | struct nf_conn *ct = (struct nf_conn *)nfct; |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 191 | struct net *net = nf_ct_net(ct); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 192 | struct nf_conntrack_l4proto *l4proto; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 193 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 194 | pr_debug("destroy_conntrack(%p)\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 195 | NF_CT_ASSERT(atomic_read(&nfct->use) == 0); |
| 196 | NF_CT_ASSERT(!timer_pending(&ct->timeout)); |
| 197 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 198 | /* To make sure we don't get any weird locking issues here: |
| 199 | * destroy_conntrack() MUST NOT be called with a write lock |
| 200 | * to nf_conntrack_lock!!! -HW */ |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 201 | rcu_read_lock(); |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 202 | 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] | 203 | if (l4proto && l4proto->destroy) |
| 204 | l4proto->destroy(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 205 | |
Patrick McHardy | 982d9a9 | 2007-02-12 11:14:11 -0800 | [diff] [blame] | 206 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 207 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 208 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 209 | /* Expectations will have been removed in clean_from_lists, |
| 210 | * except TFTP can create an expectation on the first packet, |
| 211 | * before connection is in the list, so we need to clean here, |
| 212 | * too. */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 213 | nf_ct_remove_expectations(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 214 | |
| 215 | /* We overload first tuple to link into unconfirmed list. */ |
| 216 | if (!nf_ct_is_confirmed(ct)) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 217 | BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode)); |
| 218 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 219 | } |
| 220 | |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 221 | NF_CT_STAT_INC(net, delete); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 222 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 223 | |
| 224 | if (ct->master) |
| 225 | nf_ct_put(ct->master); |
| 226 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 227 | pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 228 | nf_conntrack_free(ct); |
| 229 | } |
| 230 | |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 231 | void nf_ct_delete_from_lists(struct nf_conn *ct) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 232 | { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 233 | struct net *net = nf_ct_net(ct); |
Patrick McHardy | 5397e97 | 2007-05-19 14:23:52 -0700 | [diff] [blame] | 234 | |
Pablo Neira Ayuso | 9858a3a | 2009-06-13 12:28:22 +0200 | [diff] [blame] | 235 | nf_ct_helper_destroy(ct); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 236 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 237 | /* Inside lock so preempt is disabled on module removal path. |
| 238 | * Otherwise we can get spurious warnings. */ |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 239 | NF_CT_STAT_INC(net, delete_list); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 240 | clean_from_lists(ct); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 241 | spin_unlock_bh(&nf_conntrack_lock); |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 242 | } |
| 243 | EXPORT_SYMBOL_GPL(nf_ct_delete_from_lists); |
| 244 | |
| 245 | static void death_by_event(unsigned long ul_conntrack) |
| 246 | { |
| 247 | struct nf_conn *ct = (void *)ul_conntrack; |
| 248 | struct net *net = nf_ct_net(ct); |
| 249 | |
| 250 | if (nf_conntrack_event(IPCT_DESTROY, ct) < 0) { |
| 251 | /* bad luck, let's retry again */ |
| 252 | ct->timeout.expires = jiffies + |
| 253 | (random32() % net->ct.sysctl_events_retry_timeout); |
| 254 | add_timer(&ct->timeout); |
| 255 | return; |
| 256 | } |
| 257 | /* we've got the event delivered, now it's dying */ |
| 258 | set_bit(IPS_DYING_BIT, &ct->status); |
| 259 | spin_lock(&nf_conntrack_lock); |
| 260 | hlist_nulls_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
| 261 | spin_unlock(&nf_conntrack_lock); |
| 262 | nf_ct_put(ct); |
| 263 | } |
| 264 | |
| 265 | void nf_ct_insert_dying_list(struct nf_conn *ct) |
| 266 | { |
| 267 | struct net *net = nf_ct_net(ct); |
| 268 | |
| 269 | /* add this conntrack to the dying list */ |
| 270 | spin_lock_bh(&nf_conntrack_lock); |
| 271 | hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
| 272 | &net->ct.dying); |
| 273 | spin_unlock_bh(&nf_conntrack_lock); |
| 274 | /* set a new timer to retry event delivery */ |
| 275 | setup_timer(&ct->timeout, death_by_event, (unsigned long)ct); |
| 276 | ct->timeout.expires = jiffies + |
| 277 | (random32() % net->ct.sysctl_events_retry_timeout); |
| 278 | add_timer(&ct->timeout); |
| 279 | } |
| 280 | EXPORT_SYMBOL_GPL(nf_ct_insert_dying_list); |
| 281 | |
| 282 | static void death_by_timeout(unsigned long ul_conntrack) |
| 283 | { |
| 284 | struct nf_conn *ct = (void *)ul_conntrack; |
| 285 | |
| 286 | if (!test_bit(IPS_DYING_BIT, &ct->status) && |
| 287 | unlikely(nf_conntrack_event(IPCT_DESTROY, ct) < 0)) { |
| 288 | /* destroy event was not delivered */ |
| 289 | nf_ct_delete_from_lists(ct); |
| 290 | nf_ct_insert_dying_list(ct); |
| 291 | return; |
| 292 | } |
| 293 | set_bit(IPS_DYING_BIT, &ct->status); |
| 294 | nf_ct_delete_from_lists(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 295 | nf_ct_put(ct); |
| 296 | } |
| 297 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 298 | /* |
| 299 | * Warning : |
| 300 | * - Caller must take a reference on returned object |
| 301 | * and recheck nf_ct_tuple_equal(tuple, &h->tuple) |
| 302 | * OR |
| 303 | * - Caller must lock nf_conntrack_lock before calling this function |
| 304 | */ |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 305 | static struct nf_conntrack_tuple_hash * |
| 306 | ____nf_conntrack_find(struct net *net, u16 zone, |
| 307 | const struct nf_conntrack_tuple *tuple, u32 hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 308 | { |
| 309 | struct nf_conntrack_tuple_hash *h; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 310 | struct hlist_nulls_node *n; |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 311 | unsigned int bucket = hash_bucket(hash, net); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 312 | |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 313 | /* Disable BHs the entire time since we normally need to disable them |
| 314 | * at least once for the stats anyway. |
| 315 | */ |
| 316 | local_bh_disable(); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 317 | begin: |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 318 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[bucket], hnnode) { |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 319 | if (nf_ct_tuple_equal(tuple, &h->tuple) && |
| 320 | nf_ct_zone(nf_ct_tuplehash_to_ctrack(h)) == zone) { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 321 | NF_CT_STAT_INC(net, found); |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 322 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 323 | return h; |
| 324 | } |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 325 | NF_CT_STAT_INC(net, searched); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 326 | } |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 327 | /* |
| 328 | * if the nulls value we got at the end of this lookup is |
| 329 | * not the expected one, we must restart lookup. |
| 330 | * We probably met an item that was moved to another chain. |
| 331 | */ |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 332 | if (get_nulls_value(n) != bucket) { |
Jesper Dangaard Brouer | af740b2 | 2010-04-23 12:34:56 +0200 | [diff] [blame] | 333 | NF_CT_STAT_INC(net, search_restart); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 334 | goto begin; |
Jesper Dangaard Brouer | af740b2 | 2010-04-23 12:34:56 +0200 | [diff] [blame] | 335 | } |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 336 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 337 | |
| 338 | return NULL; |
| 339 | } |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 340 | |
| 341 | struct nf_conntrack_tuple_hash * |
| 342 | __nf_conntrack_find(struct net *net, u16 zone, |
| 343 | const struct nf_conntrack_tuple *tuple) |
| 344 | { |
| 345 | return ____nf_conntrack_find(net, zone, tuple, |
| 346 | hash_conntrack_raw(tuple, zone)); |
| 347 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 348 | EXPORT_SYMBOL_GPL(__nf_conntrack_find); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 349 | |
| 350 | /* Find a connection corresponding to a tuple. */ |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 351 | static struct nf_conntrack_tuple_hash * |
| 352 | __nf_conntrack_find_get(struct net *net, u16 zone, |
| 353 | const struct nf_conntrack_tuple *tuple, u32 hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 354 | { |
| 355 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 356 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 357 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 358 | rcu_read_lock(); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 359 | begin: |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 360 | h = ____nf_conntrack_find(net, zone, tuple, hash); |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 361 | if (h) { |
| 362 | ct = nf_ct_tuplehash_to_ctrack(h); |
Patrick McHardy | 8d8890b7 | 2009-06-22 14:14:41 +0200 | [diff] [blame] | 363 | if (unlikely(nf_ct_is_dying(ct) || |
| 364 | !atomic_inc_not_zero(&ct->ct_general.use))) |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 365 | h = NULL; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 366 | else { |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 367 | if (unlikely(!nf_ct_tuple_equal(tuple, &h->tuple) || |
| 368 | nf_ct_zone(ct) != zone)) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 369 | nf_ct_put(ct); |
| 370 | goto begin; |
| 371 | } |
| 372 | } |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 373 | } |
| 374 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 375 | |
| 376 | return h; |
| 377 | } |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 378 | |
| 379 | struct nf_conntrack_tuple_hash * |
| 380 | nf_conntrack_find_get(struct net *net, u16 zone, |
| 381 | const struct nf_conntrack_tuple *tuple) |
| 382 | { |
| 383 | return __nf_conntrack_find_get(net, zone, tuple, |
| 384 | hash_conntrack_raw(tuple, zone)); |
| 385 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 386 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 387 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 388 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
| 389 | unsigned int hash, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 390 | unsigned int repl_hash) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 391 | { |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 392 | struct net *net = nf_ct_net(ct); |
| 393 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 394 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 395 | &net->ct.hash[hash]); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 396 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode, |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 397 | &net->ct.hash[repl_hash]); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 398 | } |
| 399 | |
| 400 | void nf_conntrack_hash_insert(struct nf_conn *ct) |
| 401 | { |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 402 | struct net *net = nf_ct_net(ct); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 403 | unsigned int hash, repl_hash; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 404 | u16 zone; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 405 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 406 | zone = nf_ct_zone(ct); |
| 407 | hash = hash_conntrack(net, zone, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
| 408 | repl_hash = hash_conntrack(net, zone, &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 409 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 410 | __nf_conntrack_hash_insert(ct, hash, repl_hash); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 411 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 412 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_insert); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 413 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 414 | /* Confirm a connection given skb; places it in hash table */ |
| 415 | int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 416 | __nf_conntrack_confirm(struct sk_buff *skb) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 417 | { |
| 418 | unsigned int hash, repl_hash; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 419 | struct nf_conntrack_tuple_hash *h; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 420 | struct nf_conn *ct; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 421 | struct nf_conn_help *help; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 422 | struct hlist_nulls_node *n; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 423 | enum ip_conntrack_info ctinfo; |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 424 | struct net *net; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 425 | u16 zone; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 426 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 427 | ct = nf_ct_get(skb, &ctinfo); |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 428 | net = nf_ct_net(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 429 | |
| 430 | /* ipt_REJECT uses nf_conntrack_attach to attach related |
| 431 | ICMP/TCP RST packets in other direction. Actual packet |
| 432 | which created connection will be IP_CT_NEW or for an |
| 433 | expected connection, IP_CT_RELATED. */ |
| 434 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) |
| 435 | return NF_ACCEPT; |
| 436 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 437 | zone = nf_ct_zone(ct); |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 438 | /* reuse the hash saved before */ |
| 439 | hash = *(unsigned long *)&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev; |
| 440 | hash = hash_bucket(hash, net); |
| 441 | repl_hash = hash_conntrack(net, zone, |
| 442 | &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 443 | |
| 444 | /* We're not in hash table, and we refuse to set up related |
| 445 | connections for unconfirmed conns. But packet copies and |
| 446 | REJECT will give spurious warnings here. */ |
| 447 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ |
| 448 | |
| 449 | /* No external references means noone else could have |
| 450 | confirmed us. */ |
| 451 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 452 | pr_debug("Confirming conntrack %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 453 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 454 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 455 | |
Joerg Marx | fc35077 | 2010-05-20 15:55:30 +0200 | [diff] [blame] | 456 | /* We have to check the DYING flag inside the lock to prevent |
| 457 | a race against nf_ct_get_next_corpse() possibly called from |
| 458 | user context, else we insert an already 'dead' hash, blocking |
| 459 | further use of that particular connection -JM */ |
| 460 | |
| 461 | if (unlikely(nf_ct_is_dying(ct))) { |
| 462 | spin_unlock_bh(&nf_conntrack_lock); |
| 463 | return NF_ACCEPT; |
| 464 | } |
| 465 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 466 | /* See if there's one in the list already, including reverse: |
| 467 | NAT could have grabbed it without realizing, since we're |
| 468 | not in the hash. If there is, we lost race. */ |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 469 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 470 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 471 | &h->tuple) && |
| 472 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 473 | goto out; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 474 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[repl_hash], hnnode) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 475 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 476 | &h->tuple) && |
| 477 | zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 478 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 479 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 480 | /* Remove from unconfirmed list */ |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 481 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 482 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 483 | /* Timer relative to confirmation time, not original |
| 484 | setting time, otherwise we'd get timer wrap in |
| 485 | weird delay cases. */ |
| 486 | ct->timeout.expires += jiffies; |
| 487 | add_timer(&ct->timeout); |
| 488 | atomic_inc(&ct->ct_general.use); |
| 489 | set_bit(IPS_CONFIRMED_BIT, &ct->status); |
Patrick McHardy | 5c8ec91 | 2009-06-22 14:14:16 +0200 | [diff] [blame] | 490 | |
| 491 | /* Since the lookup is lockless, hash insertion must be done after |
| 492 | * starting the timer and setting the CONFIRMED bit. The RCU barriers |
| 493 | * guarantee that no other CPU can find the conntrack before the above |
| 494 | * stores are visible. |
| 495 | */ |
| 496 | __nf_conntrack_hash_insert(ct, hash, repl_hash); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 497 | NF_CT_STAT_INC(net, insert); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 498 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | 5c8ec91 | 2009-06-22 14:14:16 +0200 | [diff] [blame] | 499 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 500 | help = nfct_help(ct); |
| 501 | if (help && help->helper) |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 502 | nf_conntrack_event_cache(IPCT_HELPER, ct); |
Pablo Neira Ayuso | 17e6e4e | 2009-06-02 20:08:46 +0200 | [diff] [blame] | 503 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 504 | nf_conntrack_event_cache(master_ct(ct) ? |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 505 | IPCT_RELATED : IPCT_NEW, ct); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 506 | return NF_ACCEPT; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 507 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 508 | out: |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 509 | NF_CT_STAT_INC(net, insert_failed); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 510 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 511 | return NF_DROP; |
| 512 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 513 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 514 | |
| 515 | /* Returns true if a connection correspondings to the tuple (required |
| 516 | for NAT). */ |
| 517 | int |
| 518 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, |
| 519 | const struct nf_conn *ignored_conntrack) |
| 520 | { |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 521 | struct net *net = nf_ct_net(ignored_conntrack); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 522 | struct nf_conntrack_tuple_hash *h; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 523 | struct hlist_nulls_node *n; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 524 | struct nf_conn *ct; |
| 525 | u16 zone = nf_ct_zone(ignored_conntrack); |
| 526 | unsigned int hash = hash_conntrack(net, zone, tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 527 | |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 528 | /* Disable BHs the entire time since we need to disable them at |
| 529 | * least once for the stats anyway. |
| 530 | */ |
| 531 | rcu_read_lock_bh(); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 532 | 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] | 533 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 534 | if (ct != ignored_conntrack && |
| 535 | nf_ct_tuple_equal(tuple, &h->tuple) && |
| 536 | nf_ct_zone(ct) == zone) { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 537 | NF_CT_STAT_INC(net, found); |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 538 | rcu_read_unlock_bh(); |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 539 | return 1; |
| 540 | } |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 541 | NF_CT_STAT_INC(net, searched); |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 542 | } |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 543 | rcu_read_unlock_bh(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 544 | |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 545 | return 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 546 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 547 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 548 | |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 549 | #define NF_CT_EVICTION_RANGE 8 |
| 550 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 551 | /* There's a small race here where we may free a just-assured |
| 552 | connection. Too bad: we're in trouble anyway. */ |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 553 | static noinline int early_drop(struct net *net, unsigned int hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 554 | { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 555 | /* Use oldest entry, which is roughly LRU */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 556 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 557 | struct nf_conn *ct = NULL, *tmp; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 558 | struct hlist_nulls_node *n; |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 559 | unsigned int i, cnt = 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 560 | int dropped = 0; |
| 561 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 562 | rcu_read_lock(); |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 563 | for (i = 0; i < net->ct.htable_size; i++) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 564 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], |
| 565 | hnnode) { |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 566 | tmp = nf_ct_tuplehash_to_ctrack(h); |
| 567 | if (!test_bit(IPS_ASSURED_BIT, &tmp->status)) |
| 568 | ct = tmp; |
| 569 | cnt++; |
| 570 | } |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 571 | |
Changli Gao | 5ae27aa2 | 2009-11-05 14:51:31 +0100 | [diff] [blame] | 572 | if (ct != NULL) { |
| 573 | if (likely(!nf_ct_is_dying(ct) && |
| 574 | atomic_inc_not_zero(&ct->ct_general.use))) |
| 575 | break; |
| 576 | else |
| 577 | ct = NULL; |
| 578 | } |
| 579 | |
| 580 | if (cnt >= NF_CT_EVICTION_RANGE) |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 581 | break; |
Changli Gao | 5ae27aa2 | 2009-11-05 14:51:31 +0100 | [diff] [blame] | 582 | |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 583 | hash = (hash + 1) % net->ct.htable_size; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 584 | } |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 585 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 586 | |
| 587 | if (!ct) |
| 588 | return dropped; |
| 589 | |
| 590 | if (del_timer(&ct->timeout)) { |
| 591 | death_by_timeout((unsigned long)ct); |
| 592 | dropped = 1; |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 593 | NF_CT_STAT_INC_ATOMIC(net, early_drop); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 594 | } |
| 595 | nf_ct_put(ct); |
| 596 | return dropped; |
| 597 | } |
| 598 | |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 599 | static struct nf_conn * |
| 600 | __nf_conntrack_alloc(struct net *net, u16 zone, |
| 601 | const struct nf_conntrack_tuple *orig, |
| 602 | const struct nf_conntrack_tuple *repl, |
| 603 | gfp_t gfp, u32 hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 604 | { |
Julia Lawall | cd7fcbf | 2009-01-12 00:06:08 +0000 | [diff] [blame] | 605 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 606 | |
Changli Gao | b239096 | 2010-09-16 19:55:03 +0200 | [diff] [blame] | 607 | if (unlikely(!nf_conntrack_hash_rnd)) { |
| 608 | unsigned int rand; |
| 609 | |
| 610 | /* |
| 611 | * Why not initialize nf_conntrack_rnd in a "init()" function ? |
| 612 | * Because there isn't enough entropy when system initializing, |
| 613 | * and we initialize it as late as possible. |
| 614 | */ |
| 615 | do { |
| 616 | get_random_bytes(&rand, sizeof(rand)); |
| 617 | } while (!rand); |
| 618 | cmpxchg(&nf_conntrack_hash_rnd, 0, rand); |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 619 | |
| 620 | /* recompute the hash as nf_conntrack_hash_rnd is initialized */ |
| 621 | hash = hash_conntrack_raw(orig, zone); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 622 | } |
| 623 | |
Pablo Neira Ayuso | 5251e2d | 2006-09-20 12:01:06 -0700 | [diff] [blame] | 624 | /* We don't want any race condition at early drop stage */ |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 625 | atomic_inc(&net->ct.count); |
Pablo Neira Ayuso | 5251e2d | 2006-09-20 12:01:06 -0700 | [diff] [blame] | 626 | |
Patrick McHardy | 76eb946 | 2008-01-31 04:41:44 -0800 | [diff] [blame] | 627 | if (nf_conntrack_max && |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 628 | unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 629 | if (!early_drop(net, hash_bucket(hash, net))) { |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 630 | atomic_dec(&net->ct.count); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 631 | if (net_ratelimit()) |
| 632 | printk(KERN_WARNING |
| 633 | "nf_conntrack: table full, dropping" |
| 634 | " packet.\n"); |
| 635 | return ERR_PTR(-ENOMEM); |
| 636 | } |
| 637 | } |
| 638 | |
Eric Dumazet | 941297f | 2009-07-16 14:03:40 +0200 | [diff] [blame] | 639 | /* |
| 640 | * Do not use kmem_cache_zalloc(), as this cache uses |
| 641 | * SLAB_DESTROY_BY_RCU. |
| 642 | */ |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 643 | ct = kmem_cache_alloc(net->ct.nf_conntrack_cachep, gfp); |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 644 | if (ct == NULL) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 645 | pr_debug("nf_conntrack_alloc: Can't alloc conntrack.\n"); |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 646 | atomic_dec(&net->ct.count); |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 647 | return ERR_PTR(-ENOMEM); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 648 | } |
Eric Dumazet | 941297f | 2009-07-16 14:03:40 +0200 | [diff] [blame] | 649 | /* |
| 650 | * Let ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.next |
| 651 | * and ct->tuplehash[IP_CT_DIR_REPLY].hnnode.next unchanged. |
| 652 | */ |
| 653 | memset(&ct->tuplehash[IP_CT_DIR_MAX], 0, |
| 654 | sizeof(*ct) - offsetof(struct nf_conn, tuplehash[IP_CT_DIR_MAX])); |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 655 | spin_lock_init(&ct->lock); |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 656 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
Eric Dumazet | 941297f | 2009-07-16 14:03:40 +0200 | [diff] [blame] | 657 | ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL; |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 658 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 659 | /* save hash for reusing when confirming */ |
| 660 | *(unsigned long *)(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev) = hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 661 | /* Don't set timer yet: wait for confirmation */ |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 662 | setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct); |
Eric Dumazet | c2d9ba9 | 2010-06-01 06:51:19 +0000 | [diff] [blame] | 663 | write_pnet(&ct->ct_net, net); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 664 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 665 | if (zone) { |
| 666 | struct nf_conntrack_zone *nf_ct_zone; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 667 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 668 | nf_ct_zone = nf_ct_ext_add(ct, NF_CT_EXT_ZONE, GFP_ATOMIC); |
| 669 | if (!nf_ct_zone) |
| 670 | goto out_free; |
| 671 | nf_ct_zone->id = zone; |
| 672 | } |
| 673 | #endif |
Eric Dumazet | 941297f | 2009-07-16 14:03:40 +0200 | [diff] [blame] | 674 | /* |
| 675 | * changes to lookup keys must be done before setting refcnt to 1 |
| 676 | */ |
| 677 | smp_wmb(); |
| 678 | atomic_set(&ct->ct_general.use, 1); |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 679 | return ct; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 680 | |
| 681 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 682 | out_free: |
| 683 | kmem_cache_free(net->ct.nf_conntrack_cachep, ct); |
| 684 | return ERR_PTR(-ENOMEM); |
| 685 | #endif |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 686 | } |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 687 | |
| 688 | struct nf_conn *nf_conntrack_alloc(struct net *net, u16 zone, |
| 689 | const struct nf_conntrack_tuple *orig, |
| 690 | const struct nf_conntrack_tuple *repl, |
| 691 | gfp_t gfp) |
| 692 | { |
| 693 | return __nf_conntrack_alloc(net, zone, orig, repl, gfp, 0); |
| 694 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 695 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 696 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 697 | void nf_conntrack_free(struct nf_conn *ct) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 698 | { |
Eric Dumazet | 1d45209 | 2009-03-24 14:26:50 +0100 | [diff] [blame] | 699 | struct net *net = nf_ct_net(ct); |
| 700 | |
Patrick McHardy | ceeff75 | 2008-06-11 17:51:10 -0700 | [diff] [blame] | 701 | nf_ct_ext_destroy(ct); |
Eric Dumazet | 1d45209 | 2009-03-24 14:26:50 +0100 | [diff] [blame] | 702 | atomic_dec(&net->ct.count); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 703 | nf_ct_ext_free(ct); |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 704 | kmem_cache_free(net->ct.nf_conntrack_cachep, ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 705 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 706 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 707 | |
| 708 | /* Allocate a new conntrack: we return -ENOMEM if classification |
| 709 | failed due to stress. Otherwise it really is unclassifiable. */ |
| 710 | static struct nf_conntrack_tuple_hash * |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 711 | init_conntrack(struct net *net, struct nf_conn *tmpl, |
Alexey Dobriyan | 5a1fb39 | 2008-10-08 11:35:02 +0200 | [diff] [blame] | 712 | const struct nf_conntrack_tuple *tuple, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 713 | struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 714 | struct nf_conntrack_l4proto *l4proto, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 715 | struct sk_buff *skb, |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 716 | unsigned int dataoff, u32 hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 717 | { |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 718 | struct nf_conn *ct; |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 719 | struct nf_conn_help *help; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 720 | struct nf_conntrack_tuple repl_tuple; |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 721 | struct nf_conntrack_ecache *ecache; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 722 | struct nf_conntrack_expect *exp; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 723 | u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 724 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 725 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 726 | pr_debug("Can't invert tuple.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 727 | return NULL; |
| 728 | } |
| 729 | |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 730 | ct = __nf_conntrack_alloc(net, zone, tuple, &repl_tuple, GFP_ATOMIC, |
| 731 | hash); |
Julia Lawall | cd7fcbf | 2009-01-12 00:06:08 +0000 | [diff] [blame] | 732 | if (IS_ERR(ct)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 733 | pr_debug("Can't allocate conntrack.\n"); |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 734 | return (struct nf_conntrack_tuple_hash *)ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 735 | } |
| 736 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 737 | if (!l4proto->new(ct, skb, dataoff)) { |
| 738 | nf_conntrack_free(ct); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 739 | pr_debug("init conntrack: can't track with proto module\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 740 | return NULL; |
| 741 | } |
| 742 | |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 743 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 744 | |
| 745 | ecache = tmpl ? nf_ct_ecache_find(tmpl) : NULL; |
| 746 | nf_ct_ecache_ext_add(ct, ecache ? ecache->ctmask : 0, |
| 747 | ecache ? ecache->expmask : 0, |
| 748 | GFP_ATOMIC); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 749 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 750 | spin_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 751 | exp = nf_ct_find_expectation(net, zone, tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 752 | if (exp) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 753 | pr_debug("conntrack: expectation arrives ct=%p exp=%p\n", |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 754 | ct, exp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 755 | /* Welcome, Mr. Bond. We've been expecting you... */ |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 756 | __set_bit(IPS_EXPECTED_BIT, &ct->status); |
| 757 | ct->master = exp->master; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 758 | if (exp->helper) { |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 759 | help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 760 | if (help) |
| 761 | rcu_assign_pointer(help->helper, exp->helper); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 762 | } |
| 763 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 764 | #ifdef CONFIG_NF_CONNTRACK_MARK |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 765 | ct->mark = exp->master->mark; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 766 | #endif |
James Morris | 7c9728c | 2006-06-09 00:31:46 -0700 | [diff] [blame] | 767 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 768 | ct->secmark = exp->master->secmark; |
James Morris | 7c9728c | 2006-06-09 00:31:46 -0700 | [diff] [blame] | 769 | #endif |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 770 | nf_conntrack_get(&ct->master->ct_general); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 771 | NF_CT_STAT_INC(net, expect_new); |
Yasuyuki Kozakai | 22e7410 | 2006-11-27 10:25:59 -0800 | [diff] [blame] | 772 | } else { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 773 | __nf_ct_try_assign_helper(ct, tmpl, GFP_ATOMIC); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 774 | NF_CT_STAT_INC(net, new); |
Yasuyuki Kozakai | 22e7410 | 2006-11-27 10:25:59 -0800 | [diff] [blame] | 775 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 776 | |
| 777 | /* Overload tuple linked list to put us in unconfirmed list. */ |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 778 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
Alexey Dobriyan | 63c9a26 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 779 | &net->ct.unconfirmed); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 780 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 781 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 782 | |
| 783 | if (exp) { |
| 784 | if (exp->expectfn) |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 785 | exp->expectfn(ct, exp); |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 786 | nf_ct_expect_put(exp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 787 | } |
| 788 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 789 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 790 | } |
| 791 | |
| 792 | /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ |
| 793 | static inline struct nf_conn * |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 794 | resolve_normal_ct(struct net *net, struct nf_conn *tmpl, |
Alexey Dobriyan | a702a65 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 795 | struct sk_buff *skb, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 796 | unsigned int dataoff, |
| 797 | u_int16_t l3num, |
| 798 | u_int8_t protonum, |
| 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 | int *set_reply, |
| 802 | enum ip_conntrack_info *ctinfo) |
| 803 | { |
| 804 | struct nf_conntrack_tuple tuple; |
| 805 | struct nf_conntrack_tuple_hash *h; |
| 806 | struct nf_conn *ct; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 807 | u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE; |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 808 | u32 hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 809 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 810 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 811 | dataoff, l3num, protonum, &tuple, l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 812 | l4proto)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 813 | pr_debug("resolve_normal_ct: Can't get tuple\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 814 | return NULL; |
| 815 | } |
| 816 | |
| 817 | /* look for tuple match */ |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 818 | hash = hash_conntrack_raw(&tuple, zone); |
| 819 | h = __nf_conntrack_find_get(net, zone, &tuple, hash); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 820 | if (!h) { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 821 | h = init_conntrack(net, tmpl, &tuple, l3proto, l4proto, |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 822 | skb, dataoff, hash); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 823 | if (!h) |
| 824 | return NULL; |
| 825 | if (IS_ERR(h)) |
| 826 | return (void *)h; |
| 827 | } |
| 828 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 829 | |
| 830 | /* It exists; we have (non-exclusive) reference. */ |
| 831 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { |
| 832 | *ctinfo = IP_CT_ESTABLISHED + IP_CT_IS_REPLY; |
| 833 | /* Please set reply bit if this packet OK */ |
| 834 | *set_reply = 1; |
| 835 | } else { |
| 836 | /* Once we've had two way comms, always ESTABLISHED. */ |
| 837 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 838 | pr_debug("nf_conntrack_in: normal packet for %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 839 | *ctinfo = IP_CT_ESTABLISHED; |
| 840 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 841 | pr_debug("nf_conntrack_in: related packet for %p\n", |
| 842 | ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 843 | *ctinfo = IP_CT_RELATED; |
| 844 | } else { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 845 | pr_debug("nf_conntrack_in: new packet for %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 846 | *ctinfo = IP_CT_NEW; |
| 847 | } |
| 848 | *set_reply = 0; |
| 849 | } |
| 850 | skb->nfct = &ct->ct_general; |
| 851 | skb->nfctinfo = *ctinfo; |
| 852 | return ct; |
| 853 | } |
| 854 | |
| 855 | unsigned int |
Alexey Dobriyan | a702a65 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 856 | nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, |
| 857 | struct sk_buff *skb) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 858 | { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 859 | struct nf_conn *ct, *tmpl = NULL; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 860 | enum ip_conntrack_info ctinfo; |
| 861 | struct nf_conntrack_l3proto *l3proto; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 862 | struct nf_conntrack_l4proto *l4proto; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 863 | unsigned int dataoff; |
| 864 | u_int8_t protonum; |
| 865 | int set_reply = 0; |
| 866 | int ret; |
| 867 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 868 | if (skb->nfct) { |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 869 | /* Previously seen (loopback or untracked)? Ignore. */ |
| 870 | tmpl = (struct nf_conn *)skb->nfct; |
| 871 | if (!nf_ct_is_template(tmpl)) { |
| 872 | NF_CT_STAT_INC_ATOMIC(net, ignore); |
| 873 | return NF_ACCEPT; |
| 874 | } |
| 875 | skb->nfct = NULL; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 876 | } |
| 877 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 878 | /* rcu_read_lock()ed by nf_hook_slow */ |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 879 | l3proto = __nf_ct_l3proto_find(pf); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 880 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
Yasuyuki Kozakai | ffc3069 | 2007-07-14 20:44:50 -0700 | [diff] [blame] | 881 | &dataoff, &protonum); |
| 882 | if (ret <= 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 883 | pr_debug("not prepared to track yet or error occured\n"); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 884 | NF_CT_STAT_INC_ATOMIC(net, error); |
| 885 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 886 | ret = -ret; |
| 887 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 888 | } |
| 889 | |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 890 | l4proto = __nf_ct_l4proto_find(pf, protonum); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 891 | |
| 892 | /* It may be an special packet, error, unclean... |
| 893 | * inverse of the return code tells to the netfilter |
| 894 | * core what to do with the packet. */ |
Alexey Dobriyan | 74c51a1 | 2008-10-08 11:35:05 +0200 | [diff] [blame] | 895 | if (l4proto->error != NULL) { |
Patrick McHardy | 8fea97e | 2010-02-15 17:45:08 +0100 | [diff] [blame] | 896 | ret = l4proto->error(net, tmpl, skb, dataoff, &ctinfo, |
| 897 | pf, hooknum); |
Alexey Dobriyan | 74c51a1 | 2008-10-08 11:35:05 +0200 | [diff] [blame] | 898 | if (ret <= 0) { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 899 | NF_CT_STAT_INC_ATOMIC(net, error); |
| 900 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 901 | ret = -ret; |
| 902 | goto out; |
Alexey Dobriyan | 74c51a1 | 2008-10-08 11:35:05 +0200 | [diff] [blame] | 903 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 904 | } |
| 905 | |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 906 | ct = resolve_normal_ct(net, tmpl, skb, dataoff, pf, protonum, |
Alexey Dobriyan | a702a65 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 907 | l3proto, l4proto, &set_reply, &ctinfo); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 908 | if (!ct) { |
| 909 | /* Not valid part of a connection */ |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 910 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 911 | ret = NF_ACCEPT; |
| 912 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 913 | } |
| 914 | |
| 915 | if (IS_ERR(ct)) { |
| 916 | /* Too stressed to deal. */ |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 917 | NF_CT_STAT_INC_ATOMIC(net, drop); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 918 | ret = NF_DROP; |
| 919 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 920 | } |
| 921 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 922 | NF_CT_ASSERT(skb->nfct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 923 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 924 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum); |
Christoph Paasch | ec8d540 | 2009-03-16 15:51:29 +0100 | [diff] [blame] | 925 | if (ret <= 0) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 926 | /* Invalid: inverse of the return code tells |
| 927 | * the netfilter core what to do */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 928 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 929 | nf_conntrack_put(skb->nfct); |
| 930 | skb->nfct = NULL; |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 931 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Pablo Neira Ayuso | 7d1e045 | 2009-02-24 14:48:01 +0100 | [diff] [blame] | 932 | if (ret == -NF_DROP) |
| 933 | NF_CT_STAT_INC_ATOMIC(net, drop); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 934 | ret = -ret; |
| 935 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 936 | } |
| 937 | |
| 938 | 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] | 939 | nf_conntrack_event_cache(IPCT_REPLY, ct); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 940 | out: |
| 941 | if (tmpl) |
| 942 | nf_ct_put(tmpl); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 943 | |
| 944 | return ret; |
| 945 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 946 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 947 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 948 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
| 949 | const struct nf_conntrack_tuple *orig) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 950 | { |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 951 | bool ret; |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 952 | |
| 953 | rcu_read_lock(); |
| 954 | ret = nf_ct_invert_tuple(inverse, orig, |
| 955 | __nf_ct_l3proto_find(orig->src.l3num), |
| 956 | __nf_ct_l4proto_find(orig->src.l3num, |
| 957 | orig->dst.protonum)); |
| 958 | rcu_read_unlock(); |
| 959 | return ret; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 960 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 961 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 962 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 963 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
| 964 | implicitly racy: see __nf_conntrack_confirm */ |
| 965 | void nf_conntrack_alter_reply(struct nf_conn *ct, |
| 966 | const struct nf_conntrack_tuple *newreply) |
| 967 | { |
| 968 | struct nf_conn_help *help = nfct_help(ct); |
| 969 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 970 | /* Should be unconfirmed, so not in hash table yet */ |
| 971 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
| 972 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 973 | pr_debug("Altering reply tuple of %p to ", ct); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 974 | nf_ct_dump_tuple(newreply); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 975 | |
| 976 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; |
Patrick McHardy | ef1a5a5 | 2008-04-14 11:21:01 +0200 | [diff] [blame] | 977 | if (ct->master || (help && !hlist_empty(&help->expectations))) |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 978 | return; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 979 | |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 980 | rcu_read_lock(); |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 981 | __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC); |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 982 | rcu_read_unlock(); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 983 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 984 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 985 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 986 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
| 987 | void __nf_ct_refresh_acct(struct nf_conn *ct, |
| 988 | enum ip_conntrack_info ctinfo, |
| 989 | const struct sk_buff *skb, |
| 990 | unsigned long extra_jiffies, |
| 991 | int do_acct) |
| 992 | { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 993 | NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct); |
| 994 | NF_CT_ASSERT(skb); |
| 995 | |
Eric Leblond | 997ae83 | 2006-05-29 18:24:20 -0700 | [diff] [blame] | 996 | /* Only update if this is not a fixed timeout */ |
Patrick McHardy | 47d9504 | 2008-01-31 04:36:31 -0800 | [diff] [blame] | 997 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
| 998 | goto acct; |
Eric Leblond | 997ae83 | 2006-05-29 18:24:20 -0700 | [diff] [blame] | 999 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1000 | /* If not in hash table, timer will not be active yet */ |
| 1001 | if (!nf_ct_is_confirmed(ct)) { |
| 1002 | ct->timeout.expires = extra_jiffies; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1003 | } else { |
Martin Josefsson | be00c8e | 2006-11-29 02:35:12 +0100 | [diff] [blame] | 1004 | unsigned long newtime = jiffies + extra_jiffies; |
| 1005 | |
| 1006 | /* Only update the timeout if the new timeout is at least |
| 1007 | HZ jiffies from the old timeout. Need del_timer for race |
| 1008 | avoidance (may already be dying). */ |
Patrick McHardy | 65cb9fd | 2009-06-13 12:21:49 +0200 | [diff] [blame] | 1009 | if (newtime - ct->timeout.expires >= HZ) |
| 1010 | mod_timer_pending(&ct->timeout, newtime); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1011 | } |
| 1012 | |
Patrick McHardy | 47d9504 | 2008-01-31 04:36:31 -0800 | [diff] [blame] | 1013 | acct: |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1014 | if (do_acct) { |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1015 | struct nf_conn_counter *acct; |
Martin Josefsson | 3ffd5ee | 2006-11-29 02:35:10 +0100 | [diff] [blame] | 1016 | |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1017 | acct = nf_conn_acct_find(ct); |
| 1018 | if (acct) { |
Patrick McHardy | 65cb9fd | 2009-06-13 12:21:49 +0200 | [diff] [blame] | 1019 | spin_lock_bh(&ct->lock); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1020 | acct[CTINFO2DIR(ctinfo)].packets++; |
Changli Gao | 6661481 | 2010-08-02 17:56:28 +0200 | [diff] [blame] | 1021 | acct[CTINFO2DIR(ctinfo)].bytes += skb->len; |
Patrick McHardy | 65cb9fd | 2009-06-13 12:21:49 +0200 | [diff] [blame] | 1022 | spin_unlock_bh(&ct->lock); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1023 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1024 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1025 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1026 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1027 | |
David S. Miller | 4c88949 | 2008-07-14 20:22:38 -0700 | [diff] [blame] | 1028 | bool __nf_ct_kill_acct(struct nf_conn *ct, |
| 1029 | enum ip_conntrack_info ctinfo, |
| 1030 | const struct sk_buff *skb, |
| 1031 | int do_acct) |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 1032 | { |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 1033 | if (do_acct) { |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1034 | struct nf_conn_counter *acct; |
| 1035 | |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1036 | acct = nf_conn_acct_find(ct); |
| 1037 | if (acct) { |
Patrick McHardy | 65cb9fd | 2009-06-13 12:21:49 +0200 | [diff] [blame] | 1038 | spin_lock_bh(&ct->lock); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1039 | acct[CTINFO2DIR(ctinfo)].packets++; |
| 1040 | acct[CTINFO2DIR(ctinfo)].bytes += |
| 1041 | skb->len - skb_network_offset(skb); |
Patrick McHardy | 65cb9fd | 2009-06-13 12:21:49 +0200 | [diff] [blame] | 1042 | spin_unlock_bh(&ct->lock); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1043 | } |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 1044 | } |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1045 | |
David S. Miller | 4c88949 | 2008-07-14 20:22:38 -0700 | [diff] [blame] | 1046 | if (del_timer(&ct->timeout)) { |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 1047 | ct->timeout.function((unsigned long)ct); |
David S. Miller | 4c88949 | 2008-07-14 20:22:38 -0700 | [diff] [blame] | 1048 | return true; |
| 1049 | } |
| 1050 | return false; |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 1051 | } |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 1052 | EXPORT_SYMBOL_GPL(__nf_ct_kill_acct); |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 1053 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1054 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 1055 | static struct nf_ct_ext_type nf_ct_zone_extend __read_mostly = { |
| 1056 | .len = sizeof(struct nf_conntrack_zone), |
| 1057 | .align = __alignof__(struct nf_conntrack_zone), |
| 1058 | .id = NF_CT_EXT_ZONE, |
| 1059 | }; |
| 1060 | #endif |
| 1061 | |
Patrick McHardy | e281db5c | 2007-03-04 15:57:25 -0800 | [diff] [blame] | 1062 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1063 | |
| 1064 | #include <linux/netfilter/nfnetlink.h> |
| 1065 | #include <linux/netfilter/nfnetlink_conntrack.h> |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1066 | #include <linux/mutex.h> |
| 1067 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1068 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
| 1069 | * in ip_conntrack_core, since we don't want the protocols to autoload |
| 1070 | * or depend on ctnetlink */ |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 1071 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1072 | const struct nf_conntrack_tuple *tuple) |
| 1073 | { |
Patrick McHardy | 77236b6 | 2007-12-17 22:29:45 -0800 | [diff] [blame] | 1074 | NLA_PUT_BE16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port); |
| 1075 | NLA_PUT_BE16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1076 | return 0; |
| 1077 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 1078 | nla_put_failure: |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1079 | return -1; |
| 1080 | } |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 1081 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1082 | |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 1083 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
| 1084 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, |
| 1085 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1086 | }; |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 1087 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1088 | |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 1089 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1090 | struct nf_conntrack_tuple *t) |
| 1091 | { |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 1092 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1093 | return -EINVAL; |
| 1094 | |
Patrick McHardy | 77236b6 | 2007-12-17 22:29:45 -0800 | [diff] [blame] | 1095 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
| 1096 | 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] | 1097 | |
| 1098 | return 0; |
| 1099 | } |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 1100 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
Holger Eitzenberger | 5c0de29 | 2009-03-25 21:52:17 +0100 | [diff] [blame] | 1101 | |
| 1102 | int nf_ct_port_nlattr_tuple_size(void) |
| 1103 | { |
| 1104 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); |
| 1105 | } |
| 1106 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1107 | #endif |
| 1108 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1109 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
Patrick McHardy | b334aad | 2008-01-14 23:48:57 -0800 | [diff] [blame] | 1110 | static void nf_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1111 | { |
| 1112 | struct nf_conn *ct; |
| 1113 | enum ip_conntrack_info ctinfo; |
| 1114 | |
| 1115 | /* This ICMP is in reverse direction to the packet which caused it */ |
| 1116 | ct = nf_ct_get(skb, &ctinfo); |
| 1117 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) |
| 1118 | ctinfo = IP_CT_RELATED + IP_CT_IS_REPLY; |
| 1119 | else |
| 1120 | ctinfo = IP_CT_RELATED; |
| 1121 | |
| 1122 | /* Attach to new skbuff, and increment count */ |
| 1123 | nskb->nfct = &ct->ct_general; |
| 1124 | nskb->nfctinfo = ctinfo; |
| 1125 | nf_conntrack_get(nskb->nfct); |
| 1126 | } |
| 1127 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1128 | /* Bring out ya dead! */ |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1129 | static struct nf_conn * |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1130 | 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] | 1131 | void *data, unsigned int *bucket) |
| 1132 | { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1133 | struct nf_conntrack_tuple_hash *h; |
| 1134 | struct nf_conn *ct; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1135 | struct hlist_nulls_node *n; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1136 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1137 | spin_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1138 | for (; *bucket < net->ct.htable_size; (*bucket)++) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1139 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1140 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 1141 | if (iter(ct, data)) |
| 1142 | goto found; |
| 1143 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1144 | } |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1145 | hlist_nulls_for_each_entry(h, n, &net->ct.unconfirmed, hnnode) { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1146 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 1147 | if (iter(ct, data)) |
Patrick McHardy | ec68e97 | 2007-03-04 15:57:01 -0800 | [diff] [blame] | 1148 | set_bit(IPS_DYING_BIT, &ct->status); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1149 | } |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1150 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1151 | return NULL; |
| 1152 | found: |
Martin Josefsson | c073e3f | 2006-10-30 15:13:58 -0800 | [diff] [blame] | 1153 | atomic_inc(&ct->ct_general.use); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1154 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1155 | return ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1156 | } |
| 1157 | |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1158 | void nf_ct_iterate_cleanup(struct net *net, |
| 1159 | int (*iter)(struct nf_conn *i, void *data), |
| 1160 | void *data) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1161 | { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 1162 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1163 | unsigned int bucket = 0; |
| 1164 | |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1165 | while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1166 | /* Time to push up daises... */ |
| 1167 | if (del_timer(&ct->timeout)) |
| 1168 | death_by_timeout((unsigned long)ct); |
| 1169 | /* ... else the timer will get him soon. */ |
| 1170 | |
| 1171 | nf_ct_put(ct); |
| 1172 | } |
| 1173 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1174 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1175 | |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 1176 | struct __nf_ct_flush_report { |
| 1177 | u32 pid; |
| 1178 | int report; |
| 1179 | }; |
| 1180 | |
Pablo Neira Ayuso | 274d383 | 2009-06-02 20:08:38 +0200 | [diff] [blame] | 1181 | static int kill_report(struct nf_conn *i, void *data) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1182 | { |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 1183 | struct __nf_ct_flush_report *fr = (struct __nf_ct_flush_report *)data; |
| 1184 | |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 1185 | /* If we fail to deliver the event, death_by_timeout() will retry */ |
| 1186 | if (nf_conntrack_event_report(IPCT_DESTROY, i, |
| 1187 | fr->pid, fr->report) < 0) |
| 1188 | return 1; |
| 1189 | |
| 1190 | /* Avoid the delivery of the destroy event in death_by_timeout(). */ |
| 1191 | set_bit(IPS_DYING_BIT, &i->status); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1192 | return 1; |
| 1193 | } |
| 1194 | |
Pablo Neira Ayuso | 274d383 | 2009-06-02 20:08:38 +0200 | [diff] [blame] | 1195 | static int kill_all(struct nf_conn *i, void *data) |
| 1196 | { |
| 1197 | return 1; |
| 1198 | } |
| 1199 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1200 | void nf_ct_free_hashtable(void *hash, int vmalloced, unsigned int size) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1201 | { |
| 1202 | if (vmalloced) |
| 1203 | vfree(hash); |
| 1204 | else |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1205 | free_pages((unsigned long)hash, |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1206 | get_order(sizeof(struct hlist_head) * size)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1207 | } |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1208 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1209 | |
Pablo Neira Ayuso | 274d383 | 2009-06-02 20:08:38 +0200 | [diff] [blame] | 1210 | void nf_conntrack_flush_report(struct net *net, u32 pid, int report) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1211 | { |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 1212 | struct __nf_ct_flush_report fr = { |
| 1213 | .pid = pid, |
| 1214 | .report = report, |
| 1215 | }; |
Pablo Neira Ayuso | 274d383 | 2009-06-02 20:08:38 +0200 | [diff] [blame] | 1216 | nf_ct_iterate_cleanup(net, kill_report, &fr); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1217 | } |
Pablo Neira Ayuso | 274d383 | 2009-06-02 20:08:38 +0200 | [diff] [blame] | 1218 | EXPORT_SYMBOL_GPL(nf_conntrack_flush_report); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1219 | |
Alexey Dobriyan | ee254fa | 2009-08-31 14:23:15 +0200 | [diff] [blame] | 1220 | static void nf_ct_release_dying_list(struct net *net) |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 1221 | { |
| 1222 | struct nf_conntrack_tuple_hash *h; |
| 1223 | struct nf_conn *ct; |
| 1224 | struct hlist_nulls_node *n; |
| 1225 | |
| 1226 | spin_lock_bh(&nf_conntrack_lock); |
Alexey Dobriyan | ee254fa | 2009-08-31 14:23:15 +0200 | [diff] [blame] | 1227 | hlist_nulls_for_each_entry(h, n, &net->ct.dying, hnnode) { |
Pablo Neira Ayuso | dd7669a | 2009-06-13 12:30:52 +0200 | [diff] [blame] | 1228 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 1229 | /* never fails to remove them, no listeners at this point */ |
| 1230 | nf_ct_kill(ct); |
| 1231 | } |
| 1232 | spin_unlock_bh(&nf_conntrack_lock); |
| 1233 | } |
| 1234 | |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1235 | static int untrack_refs(void) |
| 1236 | { |
| 1237 | int cnt = 0, cpu; |
| 1238 | |
| 1239 | for_each_possible_cpu(cpu) { |
| 1240 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); |
| 1241 | |
| 1242 | cnt += atomic_read(&ct->ct_general.use) - 1; |
| 1243 | } |
| 1244 | return cnt; |
| 1245 | } |
| 1246 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1247 | static void nf_conntrack_cleanup_init_net(void) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1248 | { |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1249 | while (untrack_refs() > 0) |
Patrick McHardy | 9edd7ca | 2010-02-08 11:16:26 -0800 | [diff] [blame] | 1250 | schedule(); |
| 1251 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1252 | nf_conntrack_helper_fini(); |
| 1253 | nf_conntrack_proto_fini(); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1254 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 1255 | nf_ct_extend_unregister(&nf_ct_zone_extend); |
| 1256 | #endif |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1257 | } |
Yasuyuki Kozakai | 7d3cdc6 | 2006-02-15 15:22:21 -0800 | [diff] [blame] | 1258 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1259 | static void nf_conntrack_cleanup_net(struct net *net) |
| 1260 | { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1261 | i_see_dead_people: |
Pablo Neira Ayuso | 274d383 | 2009-06-02 20:08:38 +0200 | [diff] [blame] | 1262 | nf_ct_iterate_cleanup(net, kill_all, NULL); |
Alexey Dobriyan | ee254fa | 2009-08-31 14:23:15 +0200 | [diff] [blame] | 1263 | nf_ct_release_dying_list(net); |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1264 | if (atomic_read(&net->ct.count) != 0) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1265 | schedule(); |
| 1266 | goto i_see_dead_people; |
| 1267 | } |
| 1268 | |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1269 | nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc, |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1270 | net->ct.htable_size); |
Pablo Neira Ayuso | a0891aa | 2009-06-13 12:26:29 +0200 | [diff] [blame] | 1271 | nf_conntrack_ecache_fini(net); |
Alexey Dobriyan | d716a4d | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1272 | nf_conntrack_acct_fini(net); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1273 | nf_conntrack_expect_fini(net); |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 1274 | kmem_cache_destroy(net->ct.nf_conntrack_cachep); |
| 1275 | kfree(net->ct.slabname); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1276 | free_percpu(net->ct.stat); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1277 | } |
| 1278 | |
| 1279 | /* Mishearing the voices in his head, our hero wonders how he's |
| 1280 | supposed to kill the mall. */ |
| 1281 | void nf_conntrack_cleanup(struct net *net) |
| 1282 | { |
| 1283 | if (net_eq(net, &init_net)) |
| 1284 | rcu_assign_pointer(ip_ct_attach, NULL); |
| 1285 | |
| 1286 | /* This makes sure all current packets have passed through |
| 1287 | netfilter framework. Roll on, two-stage module |
| 1288 | delete... */ |
| 1289 | synchronize_net(); |
| 1290 | |
| 1291 | nf_conntrack_cleanup_net(net); |
| 1292 | |
| 1293 | if (net_eq(net, &init_net)) { |
| 1294 | rcu_assign_pointer(nf_ct_destroy, NULL); |
| 1295 | nf_conntrack_cleanup_init_net(); |
| 1296 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1297 | } |
| 1298 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1299 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced, int nulls) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1300 | { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1301 | struct hlist_nulls_head *hash; |
| 1302 | unsigned int nr_slots, i; |
| 1303 | size_t sz; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1304 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1305 | *vmalloced = 0; |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 1306 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1307 | BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); |
| 1308 | nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); |
| 1309 | sz = nr_slots * sizeof(struct hlist_nulls_head); |
| 1310 | hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, |
| 1311 | get_order(sz)); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1312 | if (!hash) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1313 | *vmalloced = 1; |
| 1314 | printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n"); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1315 | hash = __vmalloc(sz, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1316 | } |
| 1317 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1318 | if (hash && nulls) |
| 1319 | for (i = 0; i < nr_slots; i++) |
| 1320 | INIT_HLIST_NULLS_HEAD(&hash[i], i); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1321 | |
| 1322 | return hash; |
| 1323 | } |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1324 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1325 | |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1326 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1327 | { |
Stephen Hemminger | 96eb24d | 2008-01-31 04:07:29 -0800 | [diff] [blame] | 1328 | int i, bucket, vmalloced, old_vmalloced; |
| 1329 | unsigned int hashsize, old_size; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1330 | struct hlist_nulls_head *hash, *old_hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1331 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1332 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1333 | |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1334 | if (current->nsproxy->net_ns != &init_net) |
| 1335 | return -EOPNOTSUPP; |
| 1336 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1337 | /* On boot, we can set this without any fancy locking. */ |
| 1338 | if (!nf_conntrack_htable_size) |
| 1339 | return param_set_uint(val, kp); |
| 1340 | |
Stephen Hemminger | 96eb24d | 2008-01-31 04:07:29 -0800 | [diff] [blame] | 1341 | hashsize = simple_strtoul(val, NULL, 0); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1342 | if (!hashsize) |
| 1343 | return -EINVAL; |
| 1344 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1345 | hash = nf_ct_alloc_hashtable(&hashsize, &vmalloced, 1); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1346 | if (!hash) |
| 1347 | return -ENOMEM; |
| 1348 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 1349 | /* Lookups in the old hash might happen in parallel, which means we |
| 1350 | * might get false negatives during connection lookup. New connections |
| 1351 | * created because of a false negative won't make it into the hash |
| 1352 | * though since that required taking the lock. |
| 1353 | */ |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1354 | spin_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1355 | for (i = 0; i < init_net.ct.htable_size; i++) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1356 | while (!hlist_nulls_empty(&init_net.ct.hash[i])) { |
| 1357 | h = hlist_nulls_entry(init_net.ct.hash[i].first, |
| 1358 | struct nf_conntrack_tuple_hash, hnnode); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1359 | ct = nf_ct_tuplehash_to_ctrack(h); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1360 | hlist_nulls_del_rcu(&h->hnnode); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1361 | bucket = __hash_conntrack(&h->tuple, nf_ct_zone(ct), |
Changli Gao | 99f07e9 | 2010-09-21 17:49:20 +0200 | [diff] [blame] | 1362 | hashsize); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1363 | hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1364 | } |
| 1365 | } |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1366 | old_size = init_net.ct.htable_size; |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1367 | old_vmalloced = init_net.ct.hash_vmalloc; |
| 1368 | old_hash = init_net.ct.hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1369 | |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1370 | init_net.ct.htable_size = nf_conntrack_htable_size = hashsize; |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1371 | init_net.ct.hash_vmalloc = vmalloced; |
| 1372 | init_net.ct.hash = hash; |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1373 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1374 | |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1375 | nf_ct_free_hashtable(old_hash, old_vmalloced, old_size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1376 | return 0; |
| 1377 | } |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1378 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1379 | |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1380 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1381 | &nf_conntrack_htable_size, 0600); |
| 1382 | |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 1383 | void nf_ct_untracked_status_or(unsigned long bits) |
| 1384 | { |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1385 | int cpu; |
| 1386 | |
| 1387 | for_each_possible_cpu(cpu) |
| 1388 | per_cpu(nf_conntrack_untracked, cpu).status |= bits; |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 1389 | } |
| 1390 | EXPORT_SYMBOL_GPL(nf_ct_untracked_status_or); |
| 1391 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1392 | static int nf_conntrack_init_init_net(void) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1393 | { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1394 | int max_factor = 8; |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1395 | int ret, cpu; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1396 | |
| 1397 | /* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1398 | * machine has 512 buckets. >= 1GB machines have 16384 buckets. */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1399 | if (!nf_conntrack_htable_size) { |
| 1400 | nf_conntrack_htable_size |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 1401 | = (((totalram_pages << PAGE_SHIFT) / 16384) |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1402 | / sizeof(struct hlist_head)); |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 1403 | if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1404 | nf_conntrack_htable_size = 16384; |
| 1405 | if (nf_conntrack_htable_size < 32) |
| 1406 | nf_conntrack_htable_size = 32; |
| 1407 | |
| 1408 | /* Use a max. factor of four by default to get the same max as |
| 1409 | * with the old struct list_heads. When a table size is given |
| 1410 | * we use the old value of 8 to avoid reducing the max. |
| 1411 | * entries. */ |
| 1412 | max_factor = 4; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1413 | } |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1414 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 1415 | |
Stephen Hemminger | 654d0fb | 2010-05-13 15:02:08 +0200 | [diff] [blame] | 1416 | printk(KERN_INFO "nf_conntrack version %s (%u buckets, %d max)\n", |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 1417 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, |
| 1418 | nf_conntrack_max); |
| 1419 | |
Patrick McHardy | ac5357e | 2007-03-14 16:38:25 -0700 | [diff] [blame] | 1420 | ret = nf_conntrack_proto_init(); |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 1421 | if (ret < 0) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1422 | goto err_proto; |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 1423 | |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 1424 | ret = nf_conntrack_helper_init(); |
| 1425 | if (ret < 0) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1426 | goto err_helper; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 1427 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1428 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 1429 | ret = nf_ct_extend_register(&nf_ct_zone_extend); |
| 1430 | if (ret < 0) |
| 1431 | goto err_extend; |
| 1432 | #endif |
Patrick McHardy | 9edd7ca | 2010-02-08 11:16:26 -0800 | [diff] [blame] | 1433 | /* Set up fake conntrack: to never be deleted, not in any hashes */ |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1434 | for_each_possible_cpu(cpu) { |
| 1435 | struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 1436 | write_pnet(&ct->ct_net, &init_net); |
| 1437 | atomic_set(&ct->ct_general.use, 1); |
| 1438 | } |
Patrick McHardy | 9edd7ca | 2010-02-08 11:16:26 -0800 | [diff] [blame] | 1439 | /* - and look it like as a confirmed connection */ |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 1440 | nf_ct_untracked_status_or(IPS_CONFIRMED | IPS_UNTRACKED); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1441 | return 0; |
| 1442 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1443 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 1444 | err_extend: |
| 1445 | nf_conntrack_helper_fini(); |
| 1446 | #endif |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1447 | err_helper: |
| 1448 | nf_conntrack_proto_fini(); |
| 1449 | err_proto: |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1450 | return ret; |
| 1451 | } |
| 1452 | |
Eric Dumazet | 8cc2019 | 2009-06-22 14:13:55 +0200 | [diff] [blame] | 1453 | /* |
| 1454 | * We need to use special "null" values, not used in hash table |
| 1455 | */ |
| 1456 | #define UNCONFIRMED_NULLS_VAL ((1<<30)+0) |
| 1457 | #define DYING_NULLS_VAL ((1<<30)+1) |
| 1458 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1459 | static int nf_conntrack_init_net(struct net *net) |
| 1460 | { |
| 1461 | int ret; |
| 1462 | |
| 1463 | atomic_set(&net->ct.count, 0); |
Eric Dumazet | 8cc2019 | 2009-06-22 14:13:55 +0200 | [diff] [blame] | 1464 | INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, UNCONFIRMED_NULLS_VAL); |
| 1465 | INIT_HLIST_NULLS_HEAD(&net->ct.dying, DYING_NULLS_VAL); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1466 | net->ct.stat = alloc_percpu(struct ip_conntrack_stat); |
| 1467 | if (!net->ct.stat) { |
| 1468 | ret = -ENOMEM; |
| 1469 | goto err_stat; |
| 1470 | } |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 1471 | |
| 1472 | net->ct.slabname = kasprintf(GFP_KERNEL, "nf_conntrack_%p", net); |
| 1473 | if (!net->ct.slabname) { |
| 1474 | ret = -ENOMEM; |
| 1475 | goto err_slabname; |
| 1476 | } |
| 1477 | |
| 1478 | net->ct.nf_conntrack_cachep = kmem_cache_create(net->ct.slabname, |
| 1479 | sizeof(struct nf_conn), 0, |
| 1480 | SLAB_DESTROY_BY_RCU, NULL); |
| 1481 | if (!net->ct.nf_conntrack_cachep) { |
| 1482 | printk(KERN_ERR "Unable to create nf_conn slab cache\n"); |
| 1483 | ret = -ENOMEM; |
| 1484 | goto err_cache; |
| 1485 | } |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1486 | |
| 1487 | net->ct.htable_size = nf_conntrack_htable_size; |
| 1488 | net->ct.hash = nf_ct_alloc_hashtable(&net->ct.htable_size, |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1489 | &net->ct.hash_vmalloc, 1); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1490 | if (!net->ct.hash) { |
| 1491 | ret = -ENOMEM; |
| 1492 | printk(KERN_ERR "Unable to create nf_conntrack_hash\n"); |
| 1493 | goto err_hash; |
| 1494 | } |
| 1495 | ret = nf_conntrack_expect_init(net); |
| 1496 | if (ret < 0) |
| 1497 | goto err_expect; |
Alexey Dobriyan | d716a4d | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1498 | ret = nf_conntrack_acct_init(net); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1499 | if (ret < 0) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1500 | goto err_acct; |
Pablo Neira Ayuso | a0891aa | 2009-06-13 12:26:29 +0200 | [diff] [blame] | 1501 | ret = nf_conntrack_ecache_init(net); |
| 1502 | if (ret < 0) |
| 1503 | goto err_ecache; |
Yasuyuki Kozakai | 7d3cdc6 | 2006-02-15 15:22:21 -0800 | [diff] [blame] | 1504 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1505 | return 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1506 | |
Pablo Neira Ayuso | a0891aa | 2009-06-13 12:26:29 +0200 | [diff] [blame] | 1507 | err_ecache: |
| 1508 | nf_conntrack_acct_fini(net); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1509 | err_acct: |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1510 | nf_conntrack_expect_fini(net); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1511 | err_expect: |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1512 | nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc, |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 1513 | net->ct.htable_size); |
Alexey Dobriyan | 6058fa6 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1514 | err_hash: |
Eric Dumazet | 5b3501f | 2010-02-08 11:16:56 -0800 | [diff] [blame] | 1515 | kmem_cache_destroy(net->ct.nf_conntrack_cachep); |
| 1516 | err_cache: |
| 1517 | kfree(net->ct.slabname); |
| 1518 | err_slabname: |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1519 | free_percpu(net->ct.stat); |
| 1520 | err_stat: |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1521 | return ret; |
| 1522 | } |
| 1523 | |
Jozsef Kadlecsik | f9dd09c | 2009-11-06 00:43:42 -0800 | [diff] [blame] | 1524 | s16 (*nf_ct_nat_offset)(const struct nf_conn *ct, |
| 1525 | enum ip_conntrack_dir dir, |
| 1526 | u32 seq); |
| 1527 | EXPORT_SYMBOL_GPL(nf_ct_nat_offset); |
| 1528 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1529 | int nf_conntrack_init(struct net *net) |
| 1530 | { |
| 1531 | int ret; |
| 1532 | |
| 1533 | if (net_eq(net, &init_net)) { |
| 1534 | ret = nf_conntrack_init_init_net(); |
| 1535 | if (ret < 0) |
| 1536 | goto out_init_net; |
| 1537 | } |
| 1538 | ret = nf_conntrack_init_net(net); |
| 1539 | if (ret < 0) |
| 1540 | goto out_net; |
| 1541 | |
| 1542 | if (net_eq(net, &init_net)) { |
| 1543 | /* For use by REJECT target */ |
| 1544 | rcu_assign_pointer(ip_ct_attach, nf_conntrack_attach); |
| 1545 | rcu_assign_pointer(nf_ct_destroy, destroy_conntrack); |
Jozsef Kadlecsik | f9dd09c | 2009-11-06 00:43:42 -0800 | [diff] [blame] | 1546 | |
| 1547 | /* Howto get NAT offsets */ |
| 1548 | rcu_assign_pointer(nf_ct_nat_offset, NULL); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1549 | } |
| 1550 | return 0; |
| 1551 | |
| 1552 | out_net: |
| 1553 | if (net_eq(net, &init_net)) |
| 1554 | nf_conntrack_cleanup_init_net(); |
| 1555 | out_init_net: |
| 1556 | return ret; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1557 | } |