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> |
| 17 | #include <linux/skbuff.h> |
| 18 | #include <linux/proc_fs.h> |
| 19 | #include <linux/vmalloc.h> |
| 20 | #include <linux/stddef.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/random.h> |
| 23 | #include <linux/jhash.h> |
| 24 | #include <linux/err.h> |
| 25 | #include <linux/percpu.h> |
| 26 | #include <linux/moduleparam.h> |
| 27 | #include <linux/notifier.h> |
| 28 | #include <linux/kernel.h> |
| 29 | #include <linux/netdevice.h> |
| 30 | #include <linux/socket.h> |
Al Viro | d7fe0f2 | 2006-12-03 23:15:30 -0500 | [diff] [blame] | 31 | #include <linux/mm.h> |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 32 | #include <linux/rculist_nulls.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 33 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 34 | #include <net/netfilter/nf_conntrack.h> |
| 35 | #include <net/netfilter/nf_conntrack_l3proto.h> |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 36 | #include <net/netfilter/nf_conntrack_l4proto.h> |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 37 | #include <net/netfilter/nf_conntrack_expect.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 38 | #include <net/netfilter/nf_conntrack_helper.h> |
| 39 | #include <net/netfilter/nf_conntrack_core.h> |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 40 | #include <net/netfilter/nf_conntrack_extend.h> |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 41 | #include <net/netfilter/nf_conntrack_acct.h> |
Pablo Neira Ayuso | e6a7d3c | 2008-10-14 11:58:31 -0700 | [diff] [blame] | 42 | #include <net/netfilter/nf_nat.h> |
Patrick McHardy | e17b666 | 2008-11-18 12:24:17 +0100 | [diff] [blame] | 43 | #include <net/netfilter/nf_nat_core.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 44 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 45 | #define NF_CONNTRACK_VERSION "0.5.0" |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 46 | |
Patrick McHardy | e17b666 | 2008-11-18 12:24:17 +0100 | [diff] [blame] | 47 | int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct, |
| 48 | enum nf_nat_manip_type manip, |
| 49 | struct nlattr *attr) __read_mostly; |
Pablo Neira Ayuso | e6a7d3c | 2008-10-14 11:58:31 -0700 | [diff] [blame] | 50 | EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook); |
| 51 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 52 | DEFINE_SPINLOCK(nf_conntrack_lock); |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 53 | EXPORT_SYMBOL_GPL(nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 54 | |
Martin Josefsson | e2b7606 | 2006-11-29 02:35:04 +0100 | [diff] [blame] | 55 | unsigned int nf_conntrack_htable_size __read_mostly; |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 56 | EXPORT_SYMBOL_GPL(nf_conntrack_htable_size); |
| 57 | |
Hagen Paul Pfeifer | e478075 | 2009-02-20 10:47:09 +0100 | [diff] [blame] | 58 | unsigned int nf_conntrack_max __read_mostly; |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 59 | EXPORT_SYMBOL_GPL(nf_conntrack_max); |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 60 | |
Martin Josefsson | e2b7606 | 2006-11-29 02:35:04 +0100 | [diff] [blame] | 61 | struct nf_conn nf_conntrack_untracked __read_mostly; |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 62 | EXPORT_SYMBOL_GPL(nf_conntrack_untracked); |
| 63 | |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 64 | static struct kmem_cache *nf_conntrack_cachep __read_mostly; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 65 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 66 | static int nf_conntrack_hash_rnd_initted; |
| 67 | static unsigned int nf_conntrack_hash_rnd; |
| 68 | |
| 69 | static u_int32_t __hash_conntrack(const struct nf_conntrack_tuple *tuple, |
| 70 | unsigned int size, unsigned int rnd) |
| 71 | { |
Patrick McHardy | 0794935 | 2008-01-31 04:40:52 -0800 | [diff] [blame] | 72 | unsigned int n; |
| 73 | u_int32_t h; |
Sami Farin | 9b88790 | 2007-03-14 16:43:00 -0700 | [diff] [blame] | 74 | |
Patrick McHardy | 0794935 | 2008-01-31 04:40:52 -0800 | [diff] [blame] | 75 | /* The direction must be ignored, so we hash everything up to the |
| 76 | * destination ports (which is a multiple of 4) and treat the last |
| 77 | * three bytes manually. |
| 78 | */ |
| 79 | n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32); |
| 80 | h = jhash2((u32 *)tuple, n, |
| 81 | rnd ^ (((__force __u16)tuple->dst.u.all << 16) | |
| 82 | tuple->dst.protonum)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 83 | |
Patrick McHardy | 0794935 | 2008-01-31 04:40:52 -0800 | [diff] [blame] | 84 | return ((u64)h * size) >> 32; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | static inline u_int32_t hash_conntrack(const struct nf_conntrack_tuple *tuple) |
| 88 | { |
| 89 | return __hash_conntrack(tuple, nf_conntrack_htable_size, |
| 90 | nf_conntrack_hash_rnd); |
| 91 | } |
| 92 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 93 | bool |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 94 | nf_ct_get_tuple(const struct sk_buff *skb, |
| 95 | unsigned int nhoff, |
| 96 | unsigned int dataoff, |
| 97 | u_int16_t l3num, |
| 98 | u_int8_t protonum, |
| 99 | struct nf_conntrack_tuple *tuple, |
| 100 | const struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 101 | const struct nf_conntrack_l4proto *l4proto) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 102 | { |
Philip Craig | 443a70d | 2008-04-29 03:35:10 -0700 | [diff] [blame] | 103 | memset(tuple, 0, sizeof(*tuple)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 104 | |
| 105 | tuple->src.l3num = l3num; |
| 106 | if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0) |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 107 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 108 | |
| 109 | tuple->dst.protonum = protonum; |
| 110 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; |
| 111 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 112 | return l4proto->pkt_to_tuple(skb, dataoff, tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 113 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 114 | EXPORT_SYMBOL_GPL(nf_ct_get_tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 115 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 116 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
| 117 | u_int16_t l3num, struct nf_conntrack_tuple *tuple) |
Yasuyuki Kozakai | e2a3123 | 2007-07-14 20:45:14 -0700 | [diff] [blame] | 118 | { |
| 119 | struct nf_conntrack_l3proto *l3proto; |
| 120 | struct nf_conntrack_l4proto *l4proto; |
| 121 | unsigned int protoff; |
| 122 | u_int8_t protonum; |
| 123 | int ret; |
| 124 | |
| 125 | rcu_read_lock(); |
| 126 | |
| 127 | l3proto = __nf_ct_l3proto_find(l3num); |
| 128 | ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum); |
| 129 | if (ret != NF_ACCEPT) { |
| 130 | rcu_read_unlock(); |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 131 | return false; |
Yasuyuki Kozakai | e2a3123 | 2007-07-14 20:45:14 -0700 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | l4proto = __nf_ct_l4proto_find(l3num, protonum); |
| 135 | |
| 136 | ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, tuple, |
| 137 | l3proto, l4proto); |
| 138 | |
| 139 | rcu_read_unlock(); |
| 140 | return ret; |
| 141 | } |
| 142 | EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); |
| 143 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 144 | bool |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 145 | nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, |
| 146 | const struct nf_conntrack_tuple *orig, |
| 147 | const struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 148 | const struct nf_conntrack_l4proto *l4proto) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 149 | { |
Philip Craig | 443a70d | 2008-04-29 03:35:10 -0700 | [diff] [blame] | 150 | memset(inverse, 0, sizeof(*inverse)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 151 | |
| 152 | inverse->src.l3num = orig->src.l3num; |
| 153 | if (l3proto->invert_tuple(inverse, orig) == 0) |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 154 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 155 | |
| 156 | inverse->dst.dir = !orig->dst.dir; |
| 157 | |
| 158 | inverse->dst.protonum = orig->dst.protonum; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 159 | return l4proto->invert_tuple(inverse, orig); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 160 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 161 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 162 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 163 | static void |
| 164 | clean_from_lists(struct nf_conn *ct) |
| 165 | { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 166 | pr_debug("clean_from_lists(%p)\n", ct); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 167 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
| 168 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 169 | |
| 170 | /* Destroy all pending expectations */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 171 | nf_ct_remove_expectations(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | static void |
| 175 | destroy_conntrack(struct nf_conntrack *nfct) |
| 176 | { |
| 177 | struct nf_conn *ct = (struct nf_conn *)nfct; |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 178 | struct net *net = nf_ct_net(ct); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 179 | struct nf_conntrack_l4proto *l4proto; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 180 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 181 | pr_debug("destroy_conntrack(%p)\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 182 | NF_CT_ASSERT(atomic_read(&nfct->use) == 0); |
| 183 | NF_CT_ASSERT(!timer_pending(&ct->timeout)); |
| 184 | |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 185 | if (!test_bit(IPS_DYING_BIT, &ct->status)) |
| 186 | nf_conntrack_event(IPCT_DESTROY, ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 187 | set_bit(IPS_DYING_BIT, &ct->status); |
| 188 | |
| 189 | /* To make sure we don't get any weird locking issues here: |
| 190 | * destroy_conntrack() MUST NOT be called with a write lock |
| 191 | * to nf_conntrack_lock!!! -HW */ |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 192 | rcu_read_lock(); |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 193 | 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] | 194 | if (l4proto && l4proto->destroy) |
| 195 | l4proto->destroy(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 196 | |
Patrick McHardy | 982d9a9 | 2007-02-12 11:14:11 -0800 | [diff] [blame] | 197 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 198 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 199 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 200 | /* Expectations will have been removed in clean_from_lists, |
| 201 | * except TFTP can create an expectation on the first packet, |
| 202 | * before connection is in the list, so we need to clean here, |
| 203 | * too. */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 204 | nf_ct_remove_expectations(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 205 | |
| 206 | /* We overload first tuple to link into unconfirmed list. */ |
| 207 | if (!nf_ct_is_confirmed(ct)) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 208 | BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode)); |
| 209 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 210 | } |
| 211 | |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 212 | NF_CT_STAT_INC(net, delete); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 213 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 214 | |
| 215 | if (ct->master) |
| 216 | nf_ct_put(ct->master); |
| 217 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 218 | pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 219 | nf_conntrack_free(ct); |
| 220 | } |
| 221 | |
| 222 | static void death_by_timeout(unsigned long ul_conntrack) |
| 223 | { |
| 224 | struct nf_conn *ct = (void *)ul_conntrack; |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 225 | struct net *net = nf_ct_net(ct); |
Patrick McHardy | 5397e97 | 2007-05-19 14:23:52 -0700 | [diff] [blame] | 226 | struct nf_conn_help *help = nfct_help(ct); |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 227 | struct nf_conntrack_helper *helper; |
Patrick McHardy | 5397e97 | 2007-05-19 14:23:52 -0700 | [diff] [blame] | 228 | |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 229 | if (help) { |
| 230 | rcu_read_lock(); |
| 231 | helper = rcu_dereference(help->helper); |
| 232 | if (helper && helper->destroy) |
| 233 | helper->destroy(ct); |
| 234 | rcu_read_unlock(); |
| 235 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 236 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 237 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 238 | /* Inside lock so preempt is disabled on module removal path. |
| 239 | * Otherwise we can get spurious warnings. */ |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 240 | NF_CT_STAT_INC(net, delete_list); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 241 | clean_from_lists(ct); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 242 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 243 | nf_ct_put(ct); |
| 244 | } |
| 245 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 246 | /* |
| 247 | * Warning : |
| 248 | * - Caller must take a reference on returned object |
| 249 | * and recheck nf_ct_tuple_equal(tuple, &h->tuple) |
| 250 | * OR |
| 251 | * - Caller must lock nf_conntrack_lock before calling this function |
| 252 | */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 253 | struct nf_conntrack_tuple_hash * |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 254 | __nf_conntrack_find(struct net *net, const struct nf_conntrack_tuple *tuple) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 255 | { |
| 256 | struct nf_conntrack_tuple_hash *h; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 257 | struct hlist_nulls_node *n; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 258 | unsigned int hash = hash_conntrack(tuple); |
| 259 | |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 260 | /* Disable BHs the entire time since we normally need to disable them |
| 261 | * at least once for the stats anyway. |
| 262 | */ |
| 263 | local_bh_disable(); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 264 | begin: |
| 265 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) { |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 266 | if (nf_ct_tuple_equal(tuple, &h->tuple)) { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 267 | NF_CT_STAT_INC(net, found); |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 268 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 269 | return h; |
| 270 | } |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 271 | NF_CT_STAT_INC(net, searched); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 272 | } |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 273 | /* |
| 274 | * if the nulls value we got at the end of this lookup is |
| 275 | * not the expected one, we must restart lookup. |
| 276 | * We probably met an item that was moved to another chain. |
| 277 | */ |
| 278 | if (get_nulls_value(n) != hash) |
| 279 | goto begin; |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 280 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 281 | |
| 282 | return NULL; |
| 283 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 284 | EXPORT_SYMBOL_GPL(__nf_conntrack_find); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 285 | |
| 286 | /* Find a connection corresponding to a tuple. */ |
| 287 | struct nf_conntrack_tuple_hash * |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 288 | nf_conntrack_find_get(struct net *net, const struct nf_conntrack_tuple *tuple) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 289 | { |
| 290 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 291 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 292 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 293 | rcu_read_lock(); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 294 | begin: |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 295 | h = __nf_conntrack_find(net, tuple); |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 296 | if (h) { |
| 297 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 298 | if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use))) |
| 299 | h = NULL; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 300 | else { |
| 301 | if (unlikely(!nf_ct_tuple_equal(tuple, &h->tuple))) { |
| 302 | nf_ct_put(ct); |
| 303 | goto begin; |
| 304 | } |
| 305 | } |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 306 | } |
| 307 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 308 | |
| 309 | return h; |
| 310 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 311 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 312 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 313 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
| 314 | unsigned int hash, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 315 | unsigned int repl_hash) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 316 | { |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 317 | struct net *net = nf_ct_net(ct); |
| 318 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 319 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 320 | &net->ct.hash[hash]); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 321 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode, |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 322 | &net->ct.hash[repl_hash]); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 323 | } |
| 324 | |
| 325 | void nf_conntrack_hash_insert(struct nf_conn *ct) |
| 326 | { |
| 327 | unsigned int hash, repl_hash; |
| 328 | |
| 329 | hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
| 330 | repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
| 331 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 332 | __nf_conntrack_hash_insert(ct, hash, repl_hash); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 333 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 334 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_insert); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 335 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 336 | /* Confirm a connection given skb; places it in hash table */ |
| 337 | int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 338 | __nf_conntrack_confirm(struct sk_buff *skb) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 339 | { |
| 340 | unsigned int hash, repl_hash; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 341 | struct nf_conntrack_tuple_hash *h; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 342 | struct nf_conn *ct; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 343 | struct nf_conn_help *help; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 344 | struct hlist_nulls_node *n; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 345 | enum ip_conntrack_info ctinfo; |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 346 | struct net *net; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 347 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 348 | ct = nf_ct_get(skb, &ctinfo); |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 349 | net = nf_ct_net(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 350 | |
| 351 | /* ipt_REJECT uses nf_conntrack_attach to attach related |
| 352 | ICMP/TCP RST packets in other direction. Actual packet |
| 353 | which created connection will be IP_CT_NEW or for an |
| 354 | expected connection, IP_CT_RELATED. */ |
| 355 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) |
| 356 | return NF_ACCEPT; |
| 357 | |
| 358 | hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
| 359 | repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
| 360 | |
| 361 | /* We're not in hash table, and we refuse to set up related |
| 362 | connections for unconfirmed conns. But packet copies and |
| 363 | REJECT will give spurious warnings here. */ |
| 364 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ |
| 365 | |
| 366 | /* No external references means noone else could have |
| 367 | confirmed us. */ |
| 368 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 369 | pr_debug("Confirming conntrack %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 370 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 371 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 372 | |
| 373 | /* See if there's one in the list already, including reverse: |
| 374 | NAT could have grabbed it without realizing, since we're |
| 375 | not in the hash. If there is, we lost race. */ |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 376 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 377 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
| 378 | &h->tuple)) |
| 379 | goto out; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 380 | 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] | 381 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
| 382 | &h->tuple)) |
| 383 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 384 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 385 | /* Remove from unconfirmed list */ |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 386 | hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 387 | |
| 388 | __nf_conntrack_hash_insert(ct, hash, repl_hash); |
| 389 | /* Timer relative to confirmation time, not original |
| 390 | setting time, otherwise we'd get timer wrap in |
| 391 | weird delay cases. */ |
| 392 | ct->timeout.expires += jiffies; |
| 393 | add_timer(&ct->timeout); |
| 394 | atomic_inc(&ct->ct_general.use); |
| 395 | set_bit(IPS_CONFIRMED_BIT, &ct->status); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 396 | NF_CT_STAT_INC(net, insert); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 397 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 398 | help = nfct_help(ct); |
| 399 | if (help && help->helper) |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 400 | nf_conntrack_event_cache(IPCT_HELPER, ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 401 | #ifdef CONFIG_NF_NAT_NEEDED |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 402 | if (test_bit(IPS_SRC_NAT_DONE_BIT, &ct->status) || |
| 403 | test_bit(IPS_DST_NAT_DONE_BIT, &ct->status)) |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 404 | nf_conntrack_event_cache(IPCT_NATINFO, ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 405 | #endif |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 406 | nf_conntrack_event_cache(master_ct(ct) ? |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 407 | IPCT_RELATED : IPCT_NEW, ct); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 408 | return NF_ACCEPT; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 409 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 410 | out: |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 411 | NF_CT_STAT_INC(net, insert_failed); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 412 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 413 | return NF_DROP; |
| 414 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 415 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 416 | |
| 417 | /* Returns true if a connection correspondings to the tuple (required |
| 418 | for NAT). */ |
| 419 | int |
| 420 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, |
| 421 | const struct nf_conn *ignored_conntrack) |
| 422 | { |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 423 | struct net *net = nf_ct_net(ignored_conntrack); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 424 | struct nf_conntrack_tuple_hash *h; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 425 | struct hlist_nulls_node *n; |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 426 | unsigned int hash = hash_conntrack(tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 427 | |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 428 | /* Disable BHs the entire time since we need to disable them at |
| 429 | * least once for the stats anyway. |
| 430 | */ |
| 431 | rcu_read_lock_bh(); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 432 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) { |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 433 | if (nf_ct_tuplehash_to_ctrack(h) != ignored_conntrack && |
| 434 | nf_ct_tuple_equal(tuple, &h->tuple)) { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 435 | NF_CT_STAT_INC(net, found); |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 436 | rcu_read_unlock_bh(); |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 437 | return 1; |
| 438 | } |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 439 | NF_CT_STAT_INC(net, searched); |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 440 | } |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 441 | rcu_read_unlock_bh(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 442 | |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 443 | return 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 444 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 445 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 446 | |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 447 | #define NF_CT_EVICTION_RANGE 8 |
| 448 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 449 | /* There's a small race here where we may free a just-assured |
| 450 | connection. Too bad: we're in trouble anyway. */ |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 451 | static noinline int early_drop(struct net *net, unsigned int hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 452 | { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 453 | /* Use oldest entry, which is roughly LRU */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 454 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 455 | struct nf_conn *ct = NULL, *tmp; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 456 | struct hlist_nulls_node *n; |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 457 | unsigned int i, cnt = 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 458 | int dropped = 0; |
| 459 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 460 | rcu_read_lock(); |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 461 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 462 | hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], |
| 463 | hnnode) { |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 464 | tmp = nf_ct_tuplehash_to_ctrack(h); |
| 465 | if (!test_bit(IPS_ASSURED_BIT, &tmp->status)) |
| 466 | ct = tmp; |
| 467 | cnt++; |
| 468 | } |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 469 | |
| 470 | if (ct && unlikely(!atomic_inc_not_zero(&ct->ct_general.use))) |
| 471 | ct = NULL; |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 472 | if (ct || cnt >= NF_CT_EVICTION_RANGE) |
| 473 | break; |
| 474 | hash = (hash + 1) % nf_conntrack_htable_size; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 475 | } |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 476 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 477 | |
| 478 | if (!ct) |
| 479 | return dropped; |
| 480 | |
| 481 | if (del_timer(&ct->timeout)) { |
| 482 | death_by_timeout((unsigned long)ct); |
| 483 | dropped = 1; |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 484 | NF_CT_STAT_INC_ATOMIC(net, early_drop); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 485 | } |
| 486 | nf_ct_put(ct); |
| 487 | return dropped; |
| 488 | } |
| 489 | |
Alexey Dobriyan | 5a1fb39 | 2008-10-08 11:35:02 +0200 | [diff] [blame] | 490 | struct nf_conn *nf_conntrack_alloc(struct net *net, |
| 491 | const struct nf_conntrack_tuple *orig, |
Pablo Neira Ayuso | b891c5a | 2008-07-08 02:35:55 -0700 | [diff] [blame] | 492 | const struct nf_conntrack_tuple *repl, |
| 493 | gfp_t gfp) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 494 | { |
Julia Lawall | cd7fcbf | 2009-01-12 00:06:08 +0000 | [diff] [blame] | 495 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 496 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 497 | if (unlikely(!nf_conntrack_hash_rnd_initted)) { |
Hagen Paul Pfeifer | af07d24 | 2009-02-20 10:48:06 +0100 | [diff] [blame] | 498 | get_random_bytes(&nf_conntrack_hash_rnd, |
| 499 | sizeof(nf_conntrack_hash_rnd)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 500 | nf_conntrack_hash_rnd_initted = 1; |
| 501 | } |
| 502 | |
Pablo Neira Ayuso | 5251e2d | 2006-09-20 12:01:06 -0700 | [diff] [blame] | 503 | /* We don't want any race condition at early drop stage */ |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 504 | atomic_inc(&net->ct.count); |
Pablo Neira Ayuso | 5251e2d | 2006-09-20 12:01:06 -0700 | [diff] [blame] | 505 | |
Patrick McHardy | 76eb946 | 2008-01-31 04:41:44 -0800 | [diff] [blame] | 506 | if (nf_conntrack_max && |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 507 | unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 508 | unsigned int hash = hash_conntrack(orig); |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 509 | if (!early_drop(net, hash)) { |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 510 | atomic_dec(&net->ct.count); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 511 | if (net_ratelimit()) |
| 512 | printk(KERN_WARNING |
| 513 | "nf_conntrack: table full, dropping" |
| 514 | " packet.\n"); |
| 515 | return ERR_PTR(-ENOMEM); |
| 516 | } |
| 517 | } |
| 518 | |
Pablo Neira Ayuso | b891c5a | 2008-07-08 02:35:55 -0700 | [diff] [blame] | 519 | ct = kmem_cache_zalloc(nf_conntrack_cachep, gfp); |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 520 | if (ct == NULL) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 521 | pr_debug("nf_conntrack_alloc: Can't alloc conntrack.\n"); |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 522 | atomic_dec(&net->ct.count); |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 523 | return ERR_PTR(-ENOMEM); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 524 | } |
| 525 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 526 | atomic_set(&ct->ct_general.use, 1); |
| 527 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
| 528 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 529 | /* Don't set timer yet: wait for confirmation */ |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 530 | setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct); |
Alexey Dobriyan | 5a1fb39 | 2008-10-08 11:35:02 +0200 | [diff] [blame] | 531 | #ifdef CONFIG_NET_NS |
| 532 | ct->ct_net = net; |
| 533 | #endif |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 534 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 535 | return ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 536 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 537 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 538 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 539 | void nf_conntrack_free(struct nf_conn *ct) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 540 | { |
Eric Dumazet | 1d45209 | 2009-03-24 14:26:50 +0100 | [diff] [blame] | 541 | struct net *net = nf_ct_net(ct); |
| 542 | |
Patrick McHardy | ceeff75 | 2008-06-11 17:51:10 -0700 | [diff] [blame] | 543 | nf_ct_ext_destroy(ct); |
Eric Dumazet | 1d45209 | 2009-03-24 14:26:50 +0100 | [diff] [blame] | 544 | atomic_dec(&net->ct.count); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 545 | nf_ct_ext_free(ct); |
| 546 | kmem_cache_free(nf_conntrack_cachep, ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 547 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 548 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 549 | |
| 550 | /* Allocate a new conntrack: we return -ENOMEM if classification |
| 551 | failed due to stress. Otherwise it really is unclassifiable. */ |
| 552 | static struct nf_conntrack_tuple_hash * |
Alexey Dobriyan | 5a1fb39 | 2008-10-08 11:35:02 +0200 | [diff] [blame] | 553 | init_conntrack(struct net *net, |
| 554 | const struct nf_conntrack_tuple *tuple, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 555 | struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 556 | struct nf_conntrack_l4proto *l4proto, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 557 | struct sk_buff *skb, |
| 558 | unsigned int dataoff) |
| 559 | { |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 560 | struct nf_conn *ct; |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 561 | struct nf_conn_help *help; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 562 | struct nf_conntrack_tuple repl_tuple; |
| 563 | struct nf_conntrack_expect *exp; |
| 564 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 565 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 566 | pr_debug("Can't invert tuple.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 567 | return NULL; |
| 568 | } |
| 569 | |
Alexey Dobriyan | 5a1fb39 | 2008-10-08 11:35:02 +0200 | [diff] [blame] | 570 | ct = nf_conntrack_alloc(net, tuple, &repl_tuple, GFP_ATOMIC); |
Julia Lawall | cd7fcbf | 2009-01-12 00:06:08 +0000 | [diff] [blame] | 571 | if (IS_ERR(ct)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 572 | pr_debug("Can't allocate conntrack.\n"); |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 573 | return (struct nf_conntrack_tuple_hash *)ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 574 | } |
| 575 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 576 | if (!l4proto->new(ct, skb, dataoff)) { |
| 577 | nf_conntrack_free(ct); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 578 | pr_debug("init conntrack: can't track with proto module\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 579 | return NULL; |
| 580 | } |
| 581 | |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 582 | nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
| 583 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 584 | spin_lock_bh(&nf_conntrack_lock); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 585 | exp = nf_ct_find_expectation(net, tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 586 | if (exp) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 587 | pr_debug("conntrack: expectation arrives ct=%p exp=%p\n", |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 588 | ct, exp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 589 | /* Welcome, Mr. Bond. We've been expecting you... */ |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 590 | __set_bit(IPS_EXPECTED_BIT, &ct->status); |
| 591 | ct->master = exp->master; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 592 | if (exp->helper) { |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 593 | help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 594 | if (help) |
| 595 | rcu_assign_pointer(help->helper, exp->helper); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 596 | } |
| 597 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 598 | #ifdef CONFIG_NF_CONNTRACK_MARK |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 599 | ct->mark = exp->master->mark; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 600 | #endif |
James Morris | 7c9728c | 2006-06-09 00:31:46 -0700 | [diff] [blame] | 601 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 602 | ct->secmark = exp->master->secmark; |
James Morris | 7c9728c | 2006-06-09 00:31:46 -0700 | [diff] [blame] | 603 | #endif |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 604 | nf_conntrack_get(&ct->master->ct_general); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 605 | NF_CT_STAT_INC(net, expect_new); |
Yasuyuki Kozakai | 22e7410 | 2006-11-27 10:25:59 -0800 | [diff] [blame] | 606 | } else { |
Pablo Neira Ayuso | 226c0c0 | 2008-11-18 11:54:05 +0100 | [diff] [blame] | 607 | __nf_ct_try_assign_helper(ct, GFP_ATOMIC); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 608 | NF_CT_STAT_INC(net, new); |
Yasuyuki Kozakai | 22e7410 | 2006-11-27 10:25:59 -0800 | [diff] [blame] | 609 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 610 | |
| 611 | /* Overload tuple linked list to put us in unconfirmed list. */ |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 612 | hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
Alexey Dobriyan | 63c9a26 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 613 | &net->ct.unconfirmed); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 614 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 615 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 616 | |
| 617 | if (exp) { |
| 618 | if (exp->expectfn) |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 619 | exp->expectfn(ct, exp); |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 620 | nf_ct_expect_put(exp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 621 | } |
| 622 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 623 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 624 | } |
| 625 | |
| 626 | /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ |
| 627 | static inline struct nf_conn * |
Alexey Dobriyan | a702a65 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 628 | resolve_normal_ct(struct net *net, |
| 629 | struct sk_buff *skb, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 630 | unsigned int dataoff, |
| 631 | u_int16_t l3num, |
| 632 | u_int8_t protonum, |
| 633 | struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 634 | struct nf_conntrack_l4proto *l4proto, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 635 | int *set_reply, |
| 636 | enum ip_conntrack_info *ctinfo) |
| 637 | { |
| 638 | struct nf_conntrack_tuple tuple; |
| 639 | struct nf_conntrack_tuple_hash *h; |
| 640 | struct nf_conn *ct; |
| 641 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 642 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 643 | dataoff, l3num, protonum, &tuple, l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 644 | l4proto)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 645 | pr_debug("resolve_normal_ct: Can't get tuple\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 646 | return NULL; |
| 647 | } |
| 648 | |
| 649 | /* look for tuple match */ |
Alexey Dobriyan | a702a65 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 650 | h = nf_conntrack_find_get(net, &tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 651 | if (!h) { |
Alexey Dobriyan | a702a65 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 652 | h = init_conntrack(net, &tuple, l3proto, l4proto, skb, dataoff); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 653 | if (!h) |
| 654 | return NULL; |
| 655 | if (IS_ERR(h)) |
| 656 | return (void *)h; |
| 657 | } |
| 658 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 659 | |
| 660 | /* It exists; we have (non-exclusive) reference. */ |
| 661 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { |
| 662 | *ctinfo = IP_CT_ESTABLISHED + IP_CT_IS_REPLY; |
| 663 | /* Please set reply bit if this packet OK */ |
| 664 | *set_reply = 1; |
| 665 | } else { |
| 666 | /* Once we've had two way comms, always ESTABLISHED. */ |
| 667 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 668 | pr_debug("nf_conntrack_in: normal packet for %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 669 | *ctinfo = IP_CT_ESTABLISHED; |
| 670 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 671 | pr_debug("nf_conntrack_in: related packet for %p\n", |
| 672 | ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 673 | *ctinfo = IP_CT_RELATED; |
| 674 | } else { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 675 | pr_debug("nf_conntrack_in: new packet for %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 676 | *ctinfo = IP_CT_NEW; |
| 677 | } |
| 678 | *set_reply = 0; |
| 679 | } |
| 680 | skb->nfct = &ct->ct_general; |
| 681 | skb->nfctinfo = *ctinfo; |
| 682 | return ct; |
| 683 | } |
| 684 | |
| 685 | unsigned int |
Alexey Dobriyan | a702a65 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 686 | nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, |
| 687 | struct sk_buff *skb) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 688 | { |
| 689 | struct nf_conn *ct; |
| 690 | enum ip_conntrack_info ctinfo; |
| 691 | struct nf_conntrack_l3proto *l3proto; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 692 | struct nf_conntrack_l4proto *l4proto; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 693 | unsigned int dataoff; |
| 694 | u_int8_t protonum; |
| 695 | int set_reply = 0; |
| 696 | int ret; |
| 697 | |
| 698 | /* Previously seen (loopback or untracked)? Ignore. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 699 | if (skb->nfct) { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 700 | NF_CT_STAT_INC_ATOMIC(net, ignore); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 701 | return NF_ACCEPT; |
| 702 | } |
| 703 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 704 | /* rcu_read_lock()ed by nf_hook_slow */ |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 705 | l3proto = __nf_ct_l3proto_find(pf); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 706 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
Yasuyuki Kozakai | ffc3069 | 2007-07-14 20:44:50 -0700 | [diff] [blame] | 707 | &dataoff, &protonum); |
| 708 | if (ret <= 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 709 | pr_debug("not prepared to track yet or error occured\n"); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 710 | NF_CT_STAT_INC_ATOMIC(net, error); |
| 711 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 712 | return -ret; |
| 713 | } |
| 714 | |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 715 | l4proto = __nf_ct_l4proto_find(pf, protonum); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 716 | |
| 717 | /* It may be an special packet, error, unclean... |
| 718 | * inverse of the return code tells to the netfilter |
| 719 | * core what to do with the packet. */ |
Alexey Dobriyan | 74c51a1 | 2008-10-08 11:35:05 +0200 | [diff] [blame] | 720 | if (l4proto->error != NULL) { |
| 721 | ret = l4proto->error(net, skb, dataoff, &ctinfo, pf, hooknum); |
| 722 | if (ret <= 0) { |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 723 | NF_CT_STAT_INC_ATOMIC(net, error); |
| 724 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Alexey Dobriyan | 74c51a1 | 2008-10-08 11:35:05 +0200 | [diff] [blame] | 725 | return -ret; |
| 726 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 727 | } |
| 728 | |
Alexey Dobriyan | a702a65 | 2008-10-08 11:35:04 +0200 | [diff] [blame] | 729 | ct = resolve_normal_ct(net, skb, dataoff, pf, protonum, |
| 730 | l3proto, l4proto, &set_reply, &ctinfo); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 731 | if (!ct) { |
| 732 | /* Not valid part of a connection */ |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 733 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 734 | return NF_ACCEPT; |
| 735 | } |
| 736 | |
| 737 | if (IS_ERR(ct)) { |
| 738 | /* Too stressed to deal. */ |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 739 | NF_CT_STAT_INC_ATOMIC(net, drop); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 740 | return NF_DROP; |
| 741 | } |
| 742 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 743 | NF_CT_ASSERT(skb->nfct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 744 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 745 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 746 | if (ret < 0) { |
| 747 | /* Invalid: inverse of the return code tells |
| 748 | * the netfilter core what to do */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 749 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 750 | nf_conntrack_put(skb->nfct); |
| 751 | skb->nfct = NULL; |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 752 | NF_CT_STAT_INC_ATOMIC(net, invalid); |
Pablo Neira Ayuso | 7d1e045 | 2009-02-24 14:48:01 +0100 | [diff] [blame] | 753 | if (ret == -NF_DROP) |
| 754 | NF_CT_STAT_INC_ATOMIC(net, drop); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 755 | return -ret; |
| 756 | } |
| 757 | |
| 758 | if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 759 | nf_conntrack_event_cache(IPCT_STATUS, ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 760 | |
| 761 | return ret; |
| 762 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 763 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 764 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 765 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
| 766 | const struct nf_conntrack_tuple *orig) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 767 | { |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 768 | bool ret; |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 769 | |
| 770 | rcu_read_lock(); |
| 771 | ret = nf_ct_invert_tuple(inverse, orig, |
| 772 | __nf_ct_l3proto_find(orig->src.l3num), |
| 773 | __nf_ct_l4proto_find(orig->src.l3num, |
| 774 | orig->dst.protonum)); |
| 775 | rcu_read_unlock(); |
| 776 | return ret; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 777 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 778 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 779 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 780 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
| 781 | implicitly racy: see __nf_conntrack_confirm */ |
| 782 | void nf_conntrack_alter_reply(struct nf_conn *ct, |
| 783 | const struct nf_conntrack_tuple *newreply) |
| 784 | { |
| 785 | struct nf_conn_help *help = nfct_help(ct); |
| 786 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 787 | /* Should be unconfirmed, so not in hash table yet */ |
| 788 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
| 789 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 790 | pr_debug("Altering reply tuple of %p to ", ct); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 791 | nf_ct_dump_tuple(newreply); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 792 | |
| 793 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; |
Patrick McHardy | ef1a5a5 | 2008-04-14 11:21:01 +0200 | [diff] [blame] | 794 | if (ct->master || (help && !hlist_empty(&help->expectations))) |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 795 | return; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 796 | |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 797 | rcu_read_lock(); |
Pablo Neira Ayuso | 226c0c0 | 2008-11-18 11:54:05 +0100 | [diff] [blame] | 798 | __nf_ct_try_assign_helper(ct, GFP_ATOMIC); |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 799 | rcu_read_unlock(); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 800 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 801 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 802 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 803 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
| 804 | void __nf_ct_refresh_acct(struct nf_conn *ct, |
| 805 | enum ip_conntrack_info ctinfo, |
| 806 | const struct sk_buff *skb, |
| 807 | unsigned long extra_jiffies, |
| 808 | int do_acct) |
| 809 | { |
| 810 | int event = 0; |
| 811 | |
| 812 | NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct); |
| 813 | NF_CT_ASSERT(skb); |
| 814 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 815 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 816 | |
Eric Leblond | 997ae83 | 2006-05-29 18:24:20 -0700 | [diff] [blame] | 817 | /* Only update if this is not a fixed timeout */ |
Patrick McHardy | 47d9504 | 2008-01-31 04:36:31 -0800 | [diff] [blame] | 818 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
| 819 | goto acct; |
Eric Leblond | 997ae83 | 2006-05-29 18:24:20 -0700 | [diff] [blame] | 820 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 821 | /* If not in hash table, timer will not be active yet */ |
| 822 | if (!nf_ct_is_confirmed(ct)) { |
| 823 | ct->timeout.expires = extra_jiffies; |
| 824 | event = IPCT_REFRESH; |
| 825 | } else { |
Martin Josefsson | be00c8e | 2006-11-29 02:35:12 +0100 | [diff] [blame] | 826 | unsigned long newtime = jiffies + extra_jiffies; |
| 827 | |
| 828 | /* Only update the timeout if the new timeout is at least |
| 829 | HZ jiffies from the old timeout. Need del_timer for race |
| 830 | avoidance (may already be dying). */ |
| 831 | if (newtime - ct->timeout.expires >= HZ |
| 832 | && del_timer(&ct->timeout)) { |
| 833 | ct->timeout.expires = newtime; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 834 | add_timer(&ct->timeout); |
| 835 | event = IPCT_REFRESH; |
| 836 | } |
| 837 | } |
| 838 | |
Patrick McHardy | 47d9504 | 2008-01-31 04:36:31 -0800 | [diff] [blame] | 839 | acct: |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 840 | if (do_acct) { |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 841 | struct nf_conn_counter *acct; |
Martin Josefsson | 3ffd5ee | 2006-11-29 02:35:10 +0100 | [diff] [blame] | 842 | |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 843 | acct = nf_conn_acct_find(ct); |
| 844 | if (acct) { |
| 845 | acct[CTINFO2DIR(ctinfo)].packets++; |
| 846 | acct[CTINFO2DIR(ctinfo)].bytes += |
| 847 | skb->len - skb_network_offset(skb); |
| 848 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 849 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 850 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 851 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 852 | |
| 853 | /* must be unlocked when calling event cache */ |
| 854 | if (event) |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 855 | nf_conntrack_event_cache(event, ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 856 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 857 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 858 | |
David S. Miller | 4c88949 | 2008-07-14 20:22:38 -0700 | [diff] [blame] | 859 | bool __nf_ct_kill_acct(struct nf_conn *ct, |
| 860 | enum ip_conntrack_info ctinfo, |
| 861 | const struct sk_buff *skb, |
| 862 | int do_acct) |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 863 | { |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 864 | if (do_acct) { |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 865 | struct nf_conn_counter *acct; |
| 866 | |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 867 | spin_lock_bh(&nf_conntrack_lock); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 868 | acct = nf_conn_acct_find(ct); |
| 869 | if (acct) { |
| 870 | acct[CTINFO2DIR(ctinfo)].packets++; |
| 871 | acct[CTINFO2DIR(ctinfo)].bytes += |
| 872 | skb->len - skb_network_offset(skb); |
| 873 | } |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 874 | spin_unlock_bh(&nf_conntrack_lock); |
| 875 | } |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 876 | |
David S. Miller | 4c88949 | 2008-07-14 20:22:38 -0700 | [diff] [blame] | 877 | if (del_timer(&ct->timeout)) { |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 878 | ct->timeout.function((unsigned long)ct); |
David S. Miller | 4c88949 | 2008-07-14 20:22:38 -0700 | [diff] [blame] | 879 | return true; |
| 880 | } |
| 881 | return false; |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 882 | } |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 883 | EXPORT_SYMBOL_GPL(__nf_ct_kill_acct); |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 884 | |
Patrick McHardy | e281db5c | 2007-03-04 15:57:25 -0800 | [diff] [blame] | 885 | #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] | 886 | |
| 887 | #include <linux/netfilter/nfnetlink.h> |
| 888 | #include <linux/netfilter/nfnetlink_conntrack.h> |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 889 | #include <linux/mutex.h> |
| 890 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 891 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
| 892 | * in ip_conntrack_core, since we don't want the protocols to autoload |
| 893 | * or depend on ctnetlink */ |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 894 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 895 | const struct nf_conntrack_tuple *tuple) |
| 896 | { |
Patrick McHardy | 77236b6 | 2007-12-17 22:29:45 -0800 | [diff] [blame] | 897 | NLA_PUT_BE16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port); |
| 898 | 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] | 899 | return 0; |
| 900 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 901 | nla_put_failure: |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 902 | return -1; |
| 903 | } |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 904 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 905 | |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 906 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
| 907 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, |
| 908 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 909 | }; |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 910 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 911 | |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 912 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 913 | struct nf_conntrack_tuple *t) |
| 914 | { |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 915 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 916 | return -EINVAL; |
| 917 | |
Patrick McHardy | 77236b6 | 2007-12-17 22:29:45 -0800 | [diff] [blame] | 918 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
| 919 | 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] | 920 | |
| 921 | return 0; |
| 922 | } |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 923 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
Holger Eitzenberger | 5c0de29 | 2009-03-25 21:52:17 +0100 | [diff] [blame^] | 924 | |
| 925 | int nf_ct_port_nlattr_tuple_size(void) |
| 926 | { |
| 927 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); |
| 928 | } |
| 929 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 930 | #endif |
| 931 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 932 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
Patrick McHardy | b334aad | 2008-01-14 23:48:57 -0800 | [diff] [blame] | 933 | 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] | 934 | { |
| 935 | struct nf_conn *ct; |
| 936 | enum ip_conntrack_info ctinfo; |
| 937 | |
| 938 | /* This ICMP is in reverse direction to the packet which caused it */ |
| 939 | ct = nf_ct_get(skb, &ctinfo); |
| 940 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) |
| 941 | ctinfo = IP_CT_RELATED + IP_CT_IS_REPLY; |
| 942 | else |
| 943 | ctinfo = IP_CT_RELATED; |
| 944 | |
| 945 | /* Attach to new skbuff, and increment count */ |
| 946 | nskb->nfct = &ct->ct_general; |
| 947 | nskb->nfctinfo = ctinfo; |
| 948 | nf_conntrack_get(nskb->nfct); |
| 949 | } |
| 950 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 951 | /* Bring out ya dead! */ |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 952 | static struct nf_conn * |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 953 | 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] | 954 | void *data, unsigned int *bucket) |
| 955 | { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 956 | struct nf_conntrack_tuple_hash *h; |
| 957 | struct nf_conn *ct; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 958 | struct hlist_nulls_node *n; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 959 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 960 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 961 | for (; *bucket < nf_conntrack_htable_size; (*bucket)++) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 962 | hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 963 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 964 | if (iter(ct, data)) |
| 965 | goto found; |
| 966 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 967 | } |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 968 | hlist_nulls_for_each_entry(h, n, &net->ct.unconfirmed, hnnode) { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 969 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 970 | if (iter(ct, data)) |
Patrick McHardy | ec68e97 | 2007-03-04 15:57:01 -0800 | [diff] [blame] | 971 | set_bit(IPS_DYING_BIT, &ct->status); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 972 | } |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 973 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 974 | return NULL; |
| 975 | found: |
Martin Josefsson | c073e3f | 2006-10-30 15:13:58 -0800 | [diff] [blame] | 976 | atomic_inc(&ct->ct_general.use); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 977 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 978 | return ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 979 | } |
| 980 | |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 981 | void nf_ct_iterate_cleanup(struct net *net, |
| 982 | int (*iter)(struct nf_conn *i, void *data), |
| 983 | void *data) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 984 | { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 985 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 986 | unsigned int bucket = 0; |
| 987 | |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 988 | while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 989 | /* Time to push up daises... */ |
| 990 | if (del_timer(&ct->timeout)) |
| 991 | death_by_timeout((unsigned long)ct); |
| 992 | /* ... else the timer will get him soon. */ |
| 993 | |
| 994 | nf_ct_put(ct); |
| 995 | } |
| 996 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 997 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 998 | |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 999 | struct __nf_ct_flush_report { |
| 1000 | u32 pid; |
| 1001 | int report; |
| 1002 | }; |
| 1003 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1004 | static int kill_all(struct nf_conn *i, void *data) |
| 1005 | { |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 1006 | struct __nf_ct_flush_report *fr = (struct __nf_ct_flush_report *)data; |
| 1007 | |
| 1008 | /* get_next_corpse sets the dying bit for us */ |
| 1009 | nf_conntrack_event_report(IPCT_DESTROY, |
| 1010 | i, |
| 1011 | fr->pid, |
| 1012 | fr->report); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1013 | return 1; |
| 1014 | } |
| 1015 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1016 | void nf_ct_free_hashtable(void *hash, int vmalloced, unsigned int size) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1017 | { |
| 1018 | if (vmalloced) |
| 1019 | vfree(hash); |
| 1020 | else |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1021 | free_pages((unsigned long)hash, |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1022 | get_order(sizeof(struct hlist_head) * size)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1023 | } |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1024 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1025 | |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 1026 | void nf_conntrack_flush(struct net *net, u32 pid, int report) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1027 | { |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 1028 | struct __nf_ct_flush_report fr = { |
| 1029 | .pid = pid, |
| 1030 | .report = report, |
| 1031 | }; |
| 1032 | nf_ct_iterate_cleanup(net, kill_all, &fr); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1033 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1034 | EXPORT_SYMBOL_GPL(nf_conntrack_flush); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1035 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1036 | static void nf_conntrack_cleanup_init_net(void) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1037 | { |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1038 | nf_conntrack_helper_fini(); |
| 1039 | nf_conntrack_proto_fini(); |
| 1040 | kmem_cache_destroy(nf_conntrack_cachep); |
| 1041 | } |
Yasuyuki Kozakai | 7d3cdc6 | 2006-02-15 15:22:21 -0800 | [diff] [blame] | 1042 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1043 | static void nf_conntrack_cleanup_net(struct net *net) |
| 1044 | { |
Alexey Dobriyan | 6058fa6 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1045 | nf_ct_event_cache_flush(net); |
| 1046 | nf_conntrack_ecache_fini(net); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1047 | i_see_dead_people: |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 1048 | nf_conntrack_flush(net, 0, 0); |
Alexey Dobriyan | 49ac871 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1049 | if (atomic_read(&net->ct.count) != 0) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1050 | schedule(); |
| 1051 | goto i_see_dead_people; |
| 1052 | } |
Patrick McHardy | 6636568 | 2005-12-05 13:36:50 -0800 | [diff] [blame] | 1053 | /* wait until all references to nf_conntrack_untracked are dropped */ |
| 1054 | while (atomic_read(&nf_conntrack_untracked.ct_general.use) > 1) |
| 1055 | schedule(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1056 | |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1057 | nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc, |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1058 | nf_conntrack_htable_size); |
Alexey Dobriyan | d716a4d | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1059 | nf_conntrack_acct_fini(net); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1060 | nf_conntrack_expect_fini(net); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1061 | free_percpu(net->ct.stat); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1062 | } |
| 1063 | |
| 1064 | /* Mishearing the voices in his head, our hero wonders how he's |
| 1065 | supposed to kill the mall. */ |
| 1066 | void nf_conntrack_cleanup(struct net *net) |
| 1067 | { |
| 1068 | if (net_eq(net, &init_net)) |
| 1069 | rcu_assign_pointer(ip_ct_attach, NULL); |
| 1070 | |
| 1071 | /* This makes sure all current packets have passed through |
| 1072 | netfilter framework. Roll on, two-stage module |
| 1073 | delete... */ |
| 1074 | synchronize_net(); |
| 1075 | |
| 1076 | nf_conntrack_cleanup_net(net); |
| 1077 | |
| 1078 | if (net_eq(net, &init_net)) { |
| 1079 | rcu_assign_pointer(nf_ct_destroy, NULL); |
| 1080 | nf_conntrack_cleanup_init_net(); |
| 1081 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1082 | } |
| 1083 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1084 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced, int nulls) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1085 | { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1086 | struct hlist_nulls_head *hash; |
| 1087 | unsigned int nr_slots, i; |
| 1088 | size_t sz; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1089 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1090 | *vmalloced = 0; |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 1091 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1092 | BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); |
| 1093 | nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); |
| 1094 | sz = nr_slots * sizeof(struct hlist_nulls_head); |
| 1095 | hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, |
| 1096 | get_order(sz)); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1097 | if (!hash) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1098 | *vmalloced = 1; |
| 1099 | printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n"); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1100 | hash = __vmalloc(sz, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1101 | } |
| 1102 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1103 | if (hash && nulls) |
| 1104 | for (i = 0; i < nr_slots; i++) |
| 1105 | INIT_HLIST_NULLS_HEAD(&hash[i], i); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1106 | |
| 1107 | return hash; |
| 1108 | } |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1109 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1110 | |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1111 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1112 | { |
Stephen Hemminger | 96eb24d | 2008-01-31 04:07:29 -0800 | [diff] [blame] | 1113 | int i, bucket, vmalloced, old_vmalloced; |
| 1114 | unsigned int hashsize, old_size; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1115 | int rnd; |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1116 | struct hlist_nulls_head *hash, *old_hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1117 | struct nf_conntrack_tuple_hash *h; |
| 1118 | |
| 1119 | /* On boot, we can set this without any fancy locking. */ |
| 1120 | if (!nf_conntrack_htable_size) |
| 1121 | return param_set_uint(val, kp); |
| 1122 | |
Stephen Hemminger | 96eb24d | 2008-01-31 04:07:29 -0800 | [diff] [blame] | 1123 | hashsize = simple_strtoul(val, NULL, 0); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1124 | if (!hashsize) |
| 1125 | return -EINVAL; |
| 1126 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1127 | hash = nf_ct_alloc_hashtable(&hashsize, &vmalloced, 1); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1128 | if (!hash) |
| 1129 | return -ENOMEM; |
| 1130 | |
| 1131 | /* We have to rehahs for the new table anyway, so we also can |
| 1132 | * use a newrandom seed */ |
Hagen Paul Pfeifer | af07d24 | 2009-02-20 10:48:06 +0100 | [diff] [blame] | 1133 | get_random_bytes(&rnd, sizeof(rnd)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1134 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 1135 | /* Lookups in the old hash might happen in parallel, which means we |
| 1136 | * might get false negatives during connection lookup. New connections |
| 1137 | * created because of a false negative won't make it into the hash |
| 1138 | * though since that required taking the lock. |
| 1139 | */ |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1140 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1141 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1142 | while (!hlist_nulls_empty(&init_net.ct.hash[i])) { |
| 1143 | h = hlist_nulls_entry(init_net.ct.hash[i].first, |
| 1144 | struct nf_conntrack_tuple_hash, hnnode); |
| 1145 | hlist_nulls_del_rcu(&h->hnnode); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1146 | bucket = __hash_conntrack(&h->tuple, hashsize, rnd); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1147 | hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1148 | } |
| 1149 | } |
| 1150 | old_size = nf_conntrack_htable_size; |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1151 | old_vmalloced = init_net.ct.hash_vmalloc; |
| 1152 | old_hash = init_net.ct.hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1153 | |
| 1154 | nf_conntrack_htable_size = hashsize; |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1155 | init_net.ct.hash_vmalloc = vmalloced; |
| 1156 | init_net.ct.hash = hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1157 | nf_conntrack_hash_rnd = rnd; |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1158 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1159 | |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1160 | nf_ct_free_hashtable(old_hash, old_vmalloced, old_size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1161 | return 0; |
| 1162 | } |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1163 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1164 | |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1165 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1166 | &nf_conntrack_htable_size, 0600); |
| 1167 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1168 | static int nf_conntrack_init_init_net(void) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1169 | { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1170 | int max_factor = 8; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1171 | int ret; |
| 1172 | |
| 1173 | /* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1174 | * machine has 512 buckets. >= 1GB machines have 16384 buckets. */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1175 | if (!nf_conntrack_htable_size) { |
| 1176 | nf_conntrack_htable_size |
| 1177 | = (((num_physpages << PAGE_SHIFT) / 16384) |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1178 | / sizeof(struct hlist_head)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1179 | if (num_physpages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1180 | nf_conntrack_htable_size = 16384; |
| 1181 | if (nf_conntrack_htable_size < 32) |
| 1182 | nf_conntrack_htable_size = 32; |
| 1183 | |
| 1184 | /* Use a max. factor of four by default to get the same max as |
| 1185 | * with the old struct list_heads. When a table size is given |
| 1186 | * we use the old value of 8 to avoid reducing the max. |
| 1187 | * entries. */ |
| 1188 | max_factor = 4; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1189 | } |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1190 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 1191 | |
| 1192 | printk("nf_conntrack version %s (%u buckets, %d max)\n", |
| 1193 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, |
| 1194 | nf_conntrack_max); |
| 1195 | |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 1196 | nf_conntrack_cachep = kmem_cache_create("nf_conntrack", |
| 1197 | sizeof(struct nf_conn), |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1198 | 0, SLAB_DESTROY_BY_RCU, NULL); |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 1199 | if (!nf_conntrack_cachep) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1200 | printk(KERN_ERR "Unable to create nf_conn slab cache\n"); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1201 | ret = -ENOMEM; |
| 1202 | goto err_cache; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1203 | } |
| 1204 | |
Patrick McHardy | ac5357e | 2007-03-14 16:38:25 -0700 | [diff] [blame] | 1205 | ret = nf_conntrack_proto_init(); |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 1206 | if (ret < 0) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1207 | goto err_proto; |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 1208 | |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 1209 | ret = nf_conntrack_helper_init(); |
| 1210 | if (ret < 0) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1211 | goto err_helper; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 1212 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1213 | return 0; |
| 1214 | |
| 1215 | err_helper: |
| 1216 | nf_conntrack_proto_fini(); |
| 1217 | err_proto: |
| 1218 | kmem_cache_destroy(nf_conntrack_cachep); |
| 1219 | err_cache: |
| 1220 | return ret; |
| 1221 | } |
| 1222 | |
| 1223 | static int nf_conntrack_init_net(struct net *net) |
| 1224 | { |
| 1225 | int ret; |
| 1226 | |
| 1227 | atomic_set(&net->ct.count, 0); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1228 | INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, 0); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1229 | net->ct.stat = alloc_percpu(struct ip_conntrack_stat); |
| 1230 | if (!net->ct.stat) { |
| 1231 | ret = -ENOMEM; |
| 1232 | goto err_stat; |
| 1233 | } |
| 1234 | ret = nf_conntrack_ecache_init(net); |
| 1235 | if (ret < 0) |
| 1236 | goto err_ecache; |
| 1237 | net->ct.hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size, |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 1238 | &net->ct.hash_vmalloc, 1); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1239 | if (!net->ct.hash) { |
| 1240 | ret = -ENOMEM; |
| 1241 | printk(KERN_ERR "Unable to create nf_conntrack_hash\n"); |
| 1242 | goto err_hash; |
| 1243 | } |
| 1244 | ret = nf_conntrack_expect_init(net); |
| 1245 | if (ret < 0) |
| 1246 | goto err_expect; |
Alexey Dobriyan | d716a4d | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1247 | ret = nf_conntrack_acct_init(net); |
Krzysztof Piotr Oledzki | 5840157 | 2008-07-21 10:01:34 -0700 | [diff] [blame] | 1248 | if (ret < 0) |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1249 | goto err_acct; |
Yasuyuki Kozakai | 7d3cdc6 | 2006-02-15 15:22:21 -0800 | [diff] [blame] | 1250 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1251 | /* Set up fake conntrack: |
| 1252 | - to never be deleted, not in any hashes */ |
Alexey Dobriyan | 5a1fb39 | 2008-10-08 11:35:02 +0200 | [diff] [blame] | 1253 | #ifdef CONFIG_NET_NS |
| 1254 | nf_conntrack_untracked.ct_net = &init_net; |
| 1255 | #endif |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1256 | atomic_set(&nf_conntrack_untracked.ct_general.use, 1); |
| 1257 | /* - and look it like as a confirmed connection */ |
| 1258 | set_bit(IPS_CONFIRMED_BIT, &nf_conntrack_untracked.status); |
| 1259 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1260 | return 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1261 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1262 | err_acct: |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1263 | nf_conntrack_expect_fini(net); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1264 | err_expect: |
Alexey Dobriyan | 400dad3 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 1265 | nf_ct_free_hashtable(net->ct.hash, net->ct.hash_vmalloc, |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1266 | nf_conntrack_htable_size); |
Alexey Dobriyan | 6058fa6 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1267 | err_hash: |
| 1268 | nf_conntrack_ecache_fini(net); |
| 1269 | err_ecache: |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 1270 | free_percpu(net->ct.stat); |
| 1271 | err_stat: |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1272 | return ret; |
| 1273 | } |
| 1274 | |
| 1275 | int nf_conntrack_init(struct net *net) |
| 1276 | { |
| 1277 | int ret; |
| 1278 | |
| 1279 | if (net_eq(net, &init_net)) { |
| 1280 | ret = nf_conntrack_init_init_net(); |
| 1281 | if (ret < 0) |
| 1282 | goto out_init_net; |
| 1283 | } |
| 1284 | ret = nf_conntrack_init_net(net); |
| 1285 | if (ret < 0) |
| 1286 | goto out_net; |
| 1287 | |
| 1288 | if (net_eq(net, &init_net)) { |
| 1289 | /* For use by REJECT target */ |
| 1290 | rcu_assign_pointer(ip_ct_attach, nf_conntrack_attach); |
| 1291 | rcu_assign_pointer(nf_ct_destroy, destroy_conntrack); |
| 1292 | } |
| 1293 | return 0; |
| 1294 | |
| 1295 | out_net: |
| 1296 | if (net_eq(net, &init_net)) |
| 1297 | nf_conntrack_cleanup_init_net(); |
| 1298 | out_init_net: |
| 1299 | return ret; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1300 | } |