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> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 32 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 33 | #include <net/netfilter/nf_conntrack.h> |
| 34 | #include <net/netfilter/nf_conntrack_l3proto.h> |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 35 | #include <net/netfilter/nf_conntrack_l4proto.h> |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 36 | #include <net/netfilter/nf_conntrack_expect.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 37 | #include <net/netfilter/nf_conntrack_helper.h> |
| 38 | #include <net/netfilter/nf_conntrack_core.h> |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 39 | #include <net/netfilter/nf_conntrack_extend.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 40 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 41 | #define NF_CONNTRACK_VERSION "0.5.0" |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 42 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 43 | DEFINE_SPINLOCK(nf_conntrack_lock); |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 44 | EXPORT_SYMBOL_GPL(nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 45 | |
| 46 | /* nf_conntrack_standalone needs this */ |
| 47 | atomic_t nf_conntrack_count = ATOMIC_INIT(0); |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 48 | EXPORT_SYMBOL_GPL(nf_conntrack_count); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 49 | |
Martin Josefsson | e2b7606 | 2006-11-29 02:35:04 +0100 | [diff] [blame] | 50 | unsigned int nf_conntrack_htable_size __read_mostly; |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 51 | EXPORT_SYMBOL_GPL(nf_conntrack_htable_size); |
| 52 | |
Brian Haley | 94aec08 | 2006-09-18 00:05:22 -0700 | [diff] [blame] | 53 | int nf_conntrack_max __read_mostly; |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 54 | EXPORT_SYMBOL_GPL(nf_conntrack_max); |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 55 | |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 56 | struct hlist_head *nf_conntrack_hash __read_mostly; |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 57 | EXPORT_SYMBOL_GPL(nf_conntrack_hash); |
| 58 | |
Martin Josefsson | e2b7606 | 2006-11-29 02:35:04 +0100 | [diff] [blame] | 59 | struct nf_conn nf_conntrack_untracked __read_mostly; |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 60 | EXPORT_SYMBOL_GPL(nf_conntrack_untracked); |
| 61 | |
Brian Haley | 94aec08 | 2006-09-18 00:05:22 -0700 | [diff] [blame] | 62 | unsigned int nf_ct_log_invalid __read_mostly; |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 63 | HLIST_HEAD(unconfirmed); |
Brian Haley | 1192e40 | 2006-09-20 12:03:46 -0700 | [diff] [blame] | 64 | static int nf_conntrack_vmalloc __read_mostly; |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 65 | static struct kmem_cache *nf_conntrack_cachep __read_mostly; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 66 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 67 | DEFINE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat); |
| 68 | EXPORT_PER_CPU_SYMBOL(nf_conntrack_stat); |
| 69 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 70 | static int nf_conntrack_hash_rnd_initted; |
| 71 | static unsigned int nf_conntrack_hash_rnd; |
| 72 | |
| 73 | static u_int32_t __hash_conntrack(const struct nf_conntrack_tuple *tuple, |
| 74 | unsigned int size, unsigned int rnd) |
| 75 | { |
Patrick McHardy | 0794935 | 2008-01-31 04:40:52 -0800 | [diff] [blame] | 76 | unsigned int n; |
| 77 | u_int32_t h; |
Sami Farin | 9b88790 | 2007-03-14 16:43:00 -0700 | [diff] [blame] | 78 | |
Patrick McHardy | 0794935 | 2008-01-31 04:40:52 -0800 | [diff] [blame] | 79 | /* The direction must be ignored, so we hash everything up to the |
| 80 | * destination ports (which is a multiple of 4) and treat the last |
| 81 | * three bytes manually. |
| 82 | */ |
| 83 | n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32); |
| 84 | h = jhash2((u32 *)tuple, n, |
| 85 | rnd ^ (((__force __u16)tuple->dst.u.all << 16) | |
| 86 | tuple->dst.protonum)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 87 | |
Patrick McHardy | 0794935 | 2008-01-31 04:40:52 -0800 | [diff] [blame] | 88 | return ((u64)h * size) >> 32; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 89 | } |
| 90 | |
| 91 | static inline u_int32_t hash_conntrack(const struct nf_conntrack_tuple *tuple) |
| 92 | { |
| 93 | return __hash_conntrack(tuple, nf_conntrack_htable_size, |
| 94 | nf_conntrack_hash_rnd); |
| 95 | } |
| 96 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame^] | 97 | bool |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 98 | nf_ct_get_tuple(const struct sk_buff *skb, |
| 99 | unsigned int nhoff, |
| 100 | unsigned int dataoff, |
| 101 | u_int16_t l3num, |
| 102 | u_int8_t protonum, |
| 103 | struct nf_conntrack_tuple *tuple, |
| 104 | const struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 105 | const struct nf_conntrack_l4proto *l4proto) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 106 | { |
| 107 | NF_CT_TUPLE_U_BLANK(tuple); |
| 108 | |
| 109 | tuple->src.l3num = l3num; |
| 110 | if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0) |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame^] | 111 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 112 | |
| 113 | tuple->dst.protonum = protonum; |
| 114 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; |
| 115 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 116 | return l4proto->pkt_to_tuple(skb, dataoff, tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 117 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 118 | EXPORT_SYMBOL_GPL(nf_ct_get_tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 119 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame^] | 120 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
| 121 | u_int16_t l3num, struct nf_conntrack_tuple *tuple) |
Yasuyuki Kozakai | e2a3123 | 2007-07-14 20:45:14 -0700 | [diff] [blame] | 122 | { |
| 123 | struct nf_conntrack_l3proto *l3proto; |
| 124 | struct nf_conntrack_l4proto *l4proto; |
| 125 | unsigned int protoff; |
| 126 | u_int8_t protonum; |
| 127 | int ret; |
| 128 | |
| 129 | rcu_read_lock(); |
| 130 | |
| 131 | l3proto = __nf_ct_l3proto_find(l3num); |
| 132 | ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum); |
| 133 | if (ret != NF_ACCEPT) { |
| 134 | rcu_read_unlock(); |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame^] | 135 | return false; |
Yasuyuki Kozakai | e2a3123 | 2007-07-14 20:45:14 -0700 | [diff] [blame] | 136 | } |
| 137 | |
| 138 | l4proto = __nf_ct_l4proto_find(l3num, protonum); |
| 139 | |
| 140 | ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, tuple, |
| 141 | l3proto, l4proto); |
| 142 | |
| 143 | rcu_read_unlock(); |
| 144 | return ret; |
| 145 | } |
| 146 | EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); |
| 147 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame^] | 148 | bool |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 149 | nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, |
| 150 | const struct nf_conntrack_tuple *orig, |
| 151 | const struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 152 | const struct nf_conntrack_l4proto *l4proto) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 153 | { |
| 154 | NF_CT_TUPLE_U_BLANK(inverse); |
| 155 | |
| 156 | inverse->src.l3num = orig->src.l3num; |
| 157 | if (l3proto->invert_tuple(inverse, orig) == 0) |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame^] | 158 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 159 | |
| 160 | inverse->dst.dir = !orig->dst.dir; |
| 161 | |
| 162 | inverse->dst.protonum = orig->dst.protonum; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 163 | return l4proto->invert_tuple(inverse, orig); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 164 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 165 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 166 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 167 | static void |
| 168 | clean_from_lists(struct nf_conn *ct) |
| 169 | { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 170 | pr_debug("clean_from_lists(%p)\n", ct); |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 171 | hlist_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode); |
| 172 | hlist_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnode); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 173 | |
| 174 | /* Destroy all pending expectations */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 175 | nf_ct_remove_expectations(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 176 | } |
| 177 | |
| 178 | static void |
| 179 | destroy_conntrack(struct nf_conntrack *nfct) |
| 180 | { |
| 181 | struct nf_conn *ct = (struct nf_conn *)nfct; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 182 | struct nf_conntrack_l4proto *l4proto; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 183 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 184 | pr_debug("destroy_conntrack(%p)\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 185 | NF_CT_ASSERT(atomic_read(&nfct->use) == 0); |
| 186 | NF_CT_ASSERT(!timer_pending(&ct->timeout)); |
| 187 | |
| 188 | nf_conntrack_event(IPCT_DESTROY, ct); |
| 189 | set_bit(IPS_DYING_BIT, &ct->status); |
| 190 | |
| 191 | /* To make sure we don't get any weird locking issues here: |
| 192 | * destroy_conntrack() MUST NOT be called with a write lock |
| 193 | * to nf_conntrack_lock!!! -HW */ |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 194 | rcu_read_lock(); |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 195 | 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] | 196 | if (l4proto && l4proto->destroy) |
| 197 | l4proto->destroy(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 198 | |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 199 | nf_ct_ext_destroy(ct); |
| 200 | |
Patrick McHardy | 982d9a9 | 2007-02-12 11:14:11 -0800 | [diff] [blame] | 201 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 202 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 203 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 204 | /* Expectations will have been removed in clean_from_lists, |
| 205 | * except TFTP can create an expectation on the first packet, |
| 206 | * before connection is in the list, so we need to clean here, |
| 207 | * too. */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 208 | nf_ct_remove_expectations(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 209 | |
| 210 | /* We overload first tuple to link into unconfirmed list. */ |
| 211 | if (!nf_ct_is_confirmed(ct)) { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 212 | BUG_ON(hlist_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode)); |
| 213 | hlist_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 214 | } |
| 215 | |
| 216 | NF_CT_STAT_INC(delete); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 217 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 218 | |
| 219 | if (ct->master) |
| 220 | nf_ct_put(ct->master); |
| 221 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 222 | pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 223 | nf_conntrack_free(ct); |
| 224 | } |
| 225 | |
| 226 | static void death_by_timeout(unsigned long ul_conntrack) |
| 227 | { |
| 228 | struct nf_conn *ct = (void *)ul_conntrack; |
Patrick McHardy | 5397e97 | 2007-05-19 14:23:52 -0700 | [diff] [blame] | 229 | struct nf_conn_help *help = nfct_help(ct); |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 230 | struct nf_conntrack_helper *helper; |
Patrick McHardy | 5397e97 | 2007-05-19 14:23:52 -0700 | [diff] [blame] | 231 | |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 232 | if (help) { |
| 233 | rcu_read_lock(); |
| 234 | helper = rcu_dereference(help->helper); |
| 235 | if (helper && helper->destroy) |
| 236 | helper->destroy(ct); |
| 237 | rcu_read_unlock(); |
| 238 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 239 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 240 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 241 | /* Inside lock so preempt is disabled on module removal path. |
| 242 | * Otherwise we can get spurious warnings. */ |
| 243 | NF_CT_STAT_INC(delete_list); |
| 244 | clean_from_lists(ct); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 245 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 246 | nf_ct_put(ct); |
| 247 | } |
| 248 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 249 | struct nf_conntrack_tuple_hash * |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 250 | __nf_conntrack_find(const struct nf_conntrack_tuple *tuple) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 251 | { |
| 252 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 253 | struct hlist_node *n; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 254 | unsigned int hash = hash_conntrack(tuple); |
| 255 | |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 256 | /* Disable BHs the entire time since we normally need to disable them |
| 257 | * at least once for the stats anyway. |
| 258 | */ |
| 259 | local_bh_disable(); |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 260 | hlist_for_each_entry_rcu(h, n, &nf_conntrack_hash[hash], hnode) { |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 261 | if (nf_ct_tuple_equal(tuple, &h->tuple)) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 262 | NF_CT_STAT_INC(found); |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 263 | local_bh_enable(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 264 | return h; |
| 265 | } |
| 266 | NF_CT_STAT_INC(searched); |
| 267 | } |
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 | |
| 270 | return NULL; |
| 271 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 272 | EXPORT_SYMBOL_GPL(__nf_conntrack_find); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 273 | |
| 274 | /* Find a connection corresponding to a tuple. */ |
| 275 | struct nf_conntrack_tuple_hash * |
Patrick McHardy | 330f7db | 2007-07-07 22:28:42 -0700 | [diff] [blame] | 276 | nf_conntrack_find_get(const struct nf_conntrack_tuple *tuple) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 277 | { |
| 278 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 279 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 280 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 281 | rcu_read_lock(); |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 282 | h = __nf_conntrack_find(tuple); |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 283 | if (h) { |
| 284 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 285 | if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use))) |
| 286 | h = NULL; |
| 287 | } |
| 288 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 289 | |
| 290 | return h; |
| 291 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 292 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 293 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 294 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
| 295 | unsigned int hash, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 296 | unsigned int repl_hash) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 297 | { |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 298 | hlist_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode, |
| 299 | &nf_conntrack_hash[hash]); |
| 300 | hlist_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnode, |
| 301 | &nf_conntrack_hash[repl_hash]); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 302 | } |
| 303 | |
| 304 | void nf_conntrack_hash_insert(struct nf_conn *ct) |
| 305 | { |
| 306 | unsigned int hash, repl_hash; |
| 307 | |
| 308 | hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
| 309 | repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
| 310 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 311 | spin_lock_bh(&nf_conntrack_lock); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 312 | __nf_conntrack_hash_insert(ct, hash, repl_hash); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 313 | spin_unlock_bh(&nf_conntrack_lock); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 314 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 315 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_insert); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 316 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 317 | /* Confirm a connection given skb; places it in hash table */ |
| 318 | int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 319 | __nf_conntrack_confirm(struct sk_buff *skb) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 320 | { |
| 321 | unsigned int hash, repl_hash; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 322 | struct nf_conntrack_tuple_hash *h; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 323 | struct nf_conn *ct; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 324 | struct nf_conn_help *help; |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 325 | struct hlist_node *n; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 326 | enum ip_conntrack_info ctinfo; |
| 327 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 328 | ct = nf_ct_get(skb, &ctinfo); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 329 | |
| 330 | /* ipt_REJECT uses nf_conntrack_attach to attach related |
| 331 | ICMP/TCP RST packets in other direction. Actual packet |
| 332 | which created connection will be IP_CT_NEW or for an |
| 333 | expected connection, IP_CT_RELATED. */ |
| 334 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) |
| 335 | return NF_ACCEPT; |
| 336 | |
| 337 | hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
| 338 | repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
| 339 | |
| 340 | /* We're not in hash table, and we refuse to set up related |
| 341 | connections for unconfirmed conns. But packet copies and |
| 342 | REJECT will give spurious warnings here. */ |
| 343 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ |
| 344 | |
| 345 | /* No external references means noone else could have |
| 346 | confirmed us. */ |
| 347 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 348 | pr_debug("Confirming conntrack %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 349 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 350 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 351 | |
| 352 | /* See if there's one in the list already, including reverse: |
| 353 | NAT could have grabbed it without realizing, since we're |
| 354 | not in the hash. If there is, we lost race. */ |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 355 | hlist_for_each_entry(h, n, &nf_conntrack_hash[hash], hnode) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 356 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
| 357 | &h->tuple)) |
| 358 | goto out; |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 359 | hlist_for_each_entry(h, n, &nf_conntrack_hash[repl_hash], hnode) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 360 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
| 361 | &h->tuple)) |
| 362 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 363 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 364 | /* Remove from unconfirmed list */ |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 365 | hlist_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 366 | |
| 367 | __nf_conntrack_hash_insert(ct, hash, repl_hash); |
| 368 | /* Timer relative to confirmation time, not original |
| 369 | setting time, otherwise we'd get timer wrap in |
| 370 | weird delay cases. */ |
| 371 | ct->timeout.expires += jiffies; |
| 372 | add_timer(&ct->timeout); |
| 373 | atomic_inc(&ct->ct_general.use); |
| 374 | set_bit(IPS_CONFIRMED_BIT, &ct->status); |
| 375 | NF_CT_STAT_INC(insert); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 376 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 377 | help = nfct_help(ct); |
| 378 | if (help && help->helper) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 379 | nf_conntrack_event_cache(IPCT_HELPER, skb); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 380 | #ifdef CONFIG_NF_NAT_NEEDED |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 381 | if (test_bit(IPS_SRC_NAT_DONE_BIT, &ct->status) || |
| 382 | test_bit(IPS_DST_NAT_DONE_BIT, &ct->status)) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 383 | nf_conntrack_event_cache(IPCT_NATINFO, skb); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 384 | #endif |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 385 | nf_conntrack_event_cache(master_ct(ct) ? |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 386 | IPCT_RELATED : IPCT_NEW, skb); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 387 | return NF_ACCEPT; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 388 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 389 | out: |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 390 | NF_CT_STAT_INC(insert_failed); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 391 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 392 | return NF_DROP; |
| 393 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 394 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 395 | |
| 396 | /* Returns true if a connection correspondings to the tuple (required |
| 397 | for NAT). */ |
| 398 | int |
| 399 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, |
| 400 | const struct nf_conn *ignored_conntrack) |
| 401 | { |
| 402 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 403 | struct hlist_node *n; |
| 404 | unsigned int hash = hash_conntrack(tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 405 | |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 406 | /* Disable BHs the entire time since we need to disable them at |
| 407 | * least once for the stats anyway. |
| 408 | */ |
| 409 | rcu_read_lock_bh(); |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 410 | hlist_for_each_entry_rcu(h, n, &nf_conntrack_hash[hash], hnode) { |
| 411 | if (nf_ct_tuplehash_to_ctrack(h) != ignored_conntrack && |
| 412 | nf_ct_tuple_equal(tuple, &h->tuple)) { |
| 413 | NF_CT_STAT_INC(found); |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 414 | rcu_read_unlock_bh(); |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 415 | return 1; |
| 416 | } |
| 417 | NF_CT_STAT_INC(searched); |
| 418 | } |
Patrick McHardy | 4e29e9e | 2008-02-27 12:07:47 -0800 | [diff] [blame] | 419 | rcu_read_unlock_bh(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 420 | |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 421 | return 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 422 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 423 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 424 | |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 425 | #define NF_CT_EVICTION_RANGE 8 |
| 426 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 427 | /* There's a small race here where we may free a just-assured |
| 428 | connection. Too bad: we're in trouble anyway. */ |
Patrick McHardy | 76eb946 | 2008-01-31 04:41:44 -0800 | [diff] [blame] | 429 | static noinline int early_drop(unsigned int hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 430 | { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 431 | /* Use oldest entry, which is roughly LRU */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 432 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 433 | struct nf_conn *ct = NULL, *tmp; |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 434 | struct hlist_node *n; |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 435 | unsigned int i, cnt = 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 436 | int dropped = 0; |
| 437 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 438 | rcu_read_lock(); |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 439 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 440 | hlist_for_each_entry_rcu(h, n, &nf_conntrack_hash[hash], |
| 441 | hnode) { |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 442 | tmp = nf_ct_tuplehash_to_ctrack(h); |
| 443 | if (!test_bit(IPS_ASSURED_BIT, &tmp->status)) |
| 444 | ct = tmp; |
| 445 | cnt++; |
| 446 | } |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 447 | |
| 448 | if (ct && unlikely(!atomic_inc_not_zero(&ct->ct_general.use))) |
| 449 | ct = NULL; |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 450 | if (ct || cnt >= NF_CT_EVICTION_RANGE) |
| 451 | break; |
| 452 | hash = (hash + 1) % nf_conntrack_htable_size; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 453 | } |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 454 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 455 | |
| 456 | if (!ct) |
| 457 | return dropped; |
| 458 | |
| 459 | if (del_timer(&ct->timeout)) { |
| 460 | death_by_timeout((unsigned long)ct); |
| 461 | dropped = 1; |
Patrick McHardy | c0e912d | 2007-02-12 11:13:43 -0800 | [diff] [blame] | 462 | NF_CT_STAT_INC_ATOMIC(early_drop); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 463 | } |
| 464 | nf_ct_put(ct); |
| 465 | return dropped; |
| 466 | } |
| 467 | |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 468 | struct nf_conn *nf_conntrack_alloc(const struct nf_conntrack_tuple *orig, |
| 469 | const struct nf_conntrack_tuple *repl) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 470 | { |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 471 | struct nf_conn *ct = NULL; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 472 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 473 | if (unlikely(!nf_conntrack_hash_rnd_initted)) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 474 | get_random_bytes(&nf_conntrack_hash_rnd, 4); |
| 475 | nf_conntrack_hash_rnd_initted = 1; |
| 476 | } |
| 477 | |
Pablo Neira Ayuso | 5251e2d | 2006-09-20 12:01:06 -0700 | [diff] [blame] | 478 | /* We don't want any race condition at early drop stage */ |
| 479 | atomic_inc(&nf_conntrack_count); |
| 480 | |
Patrick McHardy | 76eb946 | 2008-01-31 04:41:44 -0800 | [diff] [blame] | 481 | if (nf_conntrack_max && |
| 482 | unlikely(atomic_read(&nf_conntrack_count) > nf_conntrack_max)) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 483 | unsigned int hash = hash_conntrack(orig); |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 484 | if (!early_drop(hash)) { |
Pablo Neira Ayuso | 5251e2d | 2006-09-20 12:01:06 -0700 | [diff] [blame] | 485 | atomic_dec(&nf_conntrack_count); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 486 | if (net_ratelimit()) |
| 487 | printk(KERN_WARNING |
| 488 | "nf_conntrack: table full, dropping" |
| 489 | " packet.\n"); |
| 490 | return ERR_PTR(-ENOMEM); |
| 491 | } |
| 492 | } |
| 493 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 494 | ct = kmem_cache_zalloc(nf_conntrack_cachep, GFP_ATOMIC); |
| 495 | if (ct == NULL) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 496 | pr_debug("nf_conntrack_alloc: Can't alloc conntrack.\n"); |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 497 | atomic_dec(&nf_conntrack_count); |
| 498 | return ERR_PTR(-ENOMEM); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 499 | } |
| 500 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 501 | atomic_set(&ct->ct_general.use, 1); |
| 502 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
| 503 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 504 | /* Don't set timer yet: wait for confirmation */ |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 505 | setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct); |
| 506 | INIT_RCU_HEAD(&ct->rcu); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 507 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 508 | return ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 509 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 510 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 511 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 512 | static void nf_conntrack_free_rcu(struct rcu_head *head) |
| 513 | { |
| 514 | struct nf_conn *ct = container_of(head, struct nf_conn, rcu); |
| 515 | |
| 516 | nf_ct_ext_free(ct); |
| 517 | kmem_cache_free(nf_conntrack_cachep, ct); |
| 518 | atomic_dec(&nf_conntrack_count); |
| 519 | } |
| 520 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 521 | void nf_conntrack_free(struct nf_conn *ct) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 522 | { |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 523 | call_rcu(&ct->rcu, nf_conntrack_free_rcu); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 524 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 525 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 526 | |
| 527 | /* Allocate a new conntrack: we return -ENOMEM if classification |
| 528 | failed due to stress. Otherwise it really is unclassifiable. */ |
| 529 | static struct nf_conntrack_tuple_hash * |
| 530 | init_conntrack(const struct nf_conntrack_tuple *tuple, |
| 531 | struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 532 | struct nf_conntrack_l4proto *l4proto, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 533 | struct sk_buff *skb, |
| 534 | unsigned int dataoff) |
| 535 | { |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 536 | struct nf_conn *ct; |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 537 | struct nf_conn_help *help; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 538 | struct nf_conntrack_tuple repl_tuple; |
| 539 | struct nf_conntrack_expect *exp; |
| 540 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 541 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 542 | pr_debug("Can't invert tuple.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 543 | return NULL; |
| 544 | } |
| 545 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 546 | ct = nf_conntrack_alloc(tuple, &repl_tuple); |
| 547 | if (ct == NULL || IS_ERR(ct)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 548 | pr_debug("Can't allocate conntrack.\n"); |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 549 | return (struct nf_conntrack_tuple_hash *)ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 550 | } |
| 551 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 552 | if (!l4proto->new(ct, skb, dataoff)) { |
| 553 | nf_conntrack_free(ct); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 554 | pr_debug("init conntrack: can't track with proto module\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 555 | return NULL; |
| 556 | } |
| 557 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 558 | spin_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 559 | exp = nf_ct_find_expectation(tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 560 | if (exp) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 561 | pr_debug("conntrack: expectation arrives ct=%p exp=%p\n", |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 562 | ct, exp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 563 | /* Welcome, Mr. Bond. We've been expecting you... */ |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 564 | __set_bit(IPS_EXPECTED_BIT, &ct->status); |
| 565 | ct->master = exp->master; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 566 | if (exp->helper) { |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 567 | help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 568 | if (help) |
| 569 | rcu_assign_pointer(help->helper, exp->helper); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 570 | } |
| 571 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 572 | #ifdef CONFIG_NF_CONNTRACK_MARK |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 573 | ct->mark = exp->master->mark; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 574 | #endif |
James Morris | 7c9728c | 2006-06-09 00:31:46 -0700 | [diff] [blame] | 575 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 576 | ct->secmark = exp->master->secmark; |
James Morris | 7c9728c | 2006-06-09 00:31:46 -0700 | [diff] [blame] | 577 | #endif |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 578 | nf_conntrack_get(&ct->master->ct_general); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 579 | NF_CT_STAT_INC(expect_new); |
Yasuyuki Kozakai | 22e7410 | 2006-11-27 10:25:59 -0800 | [diff] [blame] | 580 | } else { |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 581 | struct nf_conntrack_helper *helper; |
| 582 | |
| 583 | helper = __nf_ct_helper_find(&repl_tuple); |
| 584 | if (helper) { |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 585 | help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 586 | if (help) |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 587 | rcu_assign_pointer(help->helper, helper); |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 588 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 589 | NF_CT_STAT_INC(new); |
Yasuyuki Kozakai | 22e7410 | 2006-11-27 10:25:59 -0800 | [diff] [blame] | 590 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 591 | |
| 592 | /* Overload tuple linked list to put us in unconfirmed list. */ |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 593 | hlist_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode, &unconfirmed); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 594 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 595 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 596 | |
| 597 | if (exp) { |
| 598 | if (exp->expectfn) |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 599 | exp->expectfn(ct, exp); |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 600 | nf_ct_expect_put(exp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 601 | } |
| 602 | |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 603 | return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 604 | } |
| 605 | |
| 606 | /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ |
| 607 | static inline struct nf_conn * |
| 608 | resolve_normal_ct(struct sk_buff *skb, |
| 609 | unsigned int dataoff, |
| 610 | u_int16_t l3num, |
| 611 | u_int8_t protonum, |
| 612 | struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 613 | struct nf_conntrack_l4proto *l4proto, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 614 | int *set_reply, |
| 615 | enum ip_conntrack_info *ctinfo) |
| 616 | { |
| 617 | struct nf_conntrack_tuple tuple; |
| 618 | struct nf_conntrack_tuple_hash *h; |
| 619 | struct nf_conn *ct; |
| 620 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 621 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 622 | dataoff, l3num, protonum, &tuple, l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 623 | l4proto)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 624 | pr_debug("resolve_normal_ct: Can't get tuple\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 625 | return NULL; |
| 626 | } |
| 627 | |
| 628 | /* look for tuple match */ |
Patrick McHardy | 330f7db | 2007-07-07 22:28:42 -0700 | [diff] [blame] | 629 | h = nf_conntrack_find_get(&tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 630 | if (!h) { |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 631 | h = init_conntrack(&tuple, l3proto, l4proto, skb, dataoff); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 632 | if (!h) |
| 633 | return NULL; |
| 634 | if (IS_ERR(h)) |
| 635 | return (void *)h; |
| 636 | } |
| 637 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 638 | |
| 639 | /* It exists; we have (non-exclusive) reference. */ |
| 640 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { |
| 641 | *ctinfo = IP_CT_ESTABLISHED + IP_CT_IS_REPLY; |
| 642 | /* Please set reply bit if this packet OK */ |
| 643 | *set_reply = 1; |
| 644 | } else { |
| 645 | /* Once we've had two way comms, always ESTABLISHED. */ |
| 646 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 647 | pr_debug("nf_conntrack_in: normal packet for %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 648 | *ctinfo = IP_CT_ESTABLISHED; |
| 649 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 650 | pr_debug("nf_conntrack_in: related packet for %p\n", |
| 651 | ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 652 | *ctinfo = IP_CT_RELATED; |
| 653 | } else { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 654 | pr_debug("nf_conntrack_in: new packet for %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 655 | *ctinfo = IP_CT_NEW; |
| 656 | } |
| 657 | *set_reply = 0; |
| 658 | } |
| 659 | skb->nfct = &ct->ct_general; |
| 660 | skb->nfctinfo = *ctinfo; |
| 661 | return ct; |
| 662 | } |
| 663 | |
| 664 | unsigned int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 665 | nf_conntrack_in(int pf, unsigned int hooknum, struct sk_buff *skb) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 666 | { |
| 667 | struct nf_conn *ct; |
| 668 | enum ip_conntrack_info ctinfo; |
| 669 | struct nf_conntrack_l3proto *l3proto; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 670 | struct nf_conntrack_l4proto *l4proto; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 671 | unsigned int dataoff; |
| 672 | u_int8_t protonum; |
| 673 | int set_reply = 0; |
| 674 | int ret; |
| 675 | |
| 676 | /* Previously seen (loopback or untracked)? Ignore. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 677 | if (skb->nfct) { |
Patrick McHardy | c0e912d | 2007-02-12 11:13:43 -0800 | [diff] [blame] | 678 | NF_CT_STAT_INC_ATOMIC(ignore); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 679 | return NF_ACCEPT; |
| 680 | } |
| 681 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 682 | /* rcu_read_lock()ed by nf_hook_slow */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 683 | l3proto = __nf_ct_l3proto_find((u_int16_t)pf); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 684 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
Yasuyuki Kozakai | ffc3069 | 2007-07-14 20:44:50 -0700 | [diff] [blame] | 685 | &dataoff, &protonum); |
| 686 | if (ret <= 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 687 | pr_debug("not prepared to track yet or error occured\n"); |
Yasuyuki Kozakai | d87d846 | 2007-07-14 20:44:23 -0700 | [diff] [blame] | 688 | NF_CT_STAT_INC_ATOMIC(error); |
| 689 | NF_CT_STAT_INC_ATOMIC(invalid); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 690 | return -ret; |
| 691 | } |
| 692 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 693 | l4proto = __nf_ct_l4proto_find((u_int16_t)pf, protonum); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 694 | |
| 695 | /* It may be an special packet, error, unclean... |
| 696 | * inverse of the return code tells to the netfilter |
| 697 | * core what to do with the packet. */ |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 698 | if (l4proto->error != NULL && |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 699 | (ret = l4proto->error(skb, dataoff, &ctinfo, pf, hooknum)) <= 0) { |
Patrick McHardy | c0e912d | 2007-02-12 11:13:43 -0800 | [diff] [blame] | 700 | NF_CT_STAT_INC_ATOMIC(error); |
| 701 | NF_CT_STAT_INC_ATOMIC(invalid); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 702 | return -ret; |
| 703 | } |
| 704 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 705 | ct = resolve_normal_ct(skb, dataoff, pf, protonum, l3proto, l4proto, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 706 | &set_reply, &ctinfo); |
| 707 | if (!ct) { |
| 708 | /* Not valid part of a connection */ |
Patrick McHardy | c0e912d | 2007-02-12 11:13:43 -0800 | [diff] [blame] | 709 | NF_CT_STAT_INC_ATOMIC(invalid); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 710 | return NF_ACCEPT; |
| 711 | } |
| 712 | |
| 713 | if (IS_ERR(ct)) { |
| 714 | /* Too stressed to deal. */ |
Patrick McHardy | c0e912d | 2007-02-12 11:13:43 -0800 | [diff] [blame] | 715 | NF_CT_STAT_INC_ATOMIC(drop); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 716 | return NF_DROP; |
| 717 | } |
| 718 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 719 | NF_CT_ASSERT(skb->nfct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 720 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 721 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 722 | if (ret < 0) { |
| 723 | /* Invalid: inverse of the return code tells |
| 724 | * the netfilter core what to do */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 725 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 726 | nf_conntrack_put(skb->nfct); |
| 727 | skb->nfct = NULL; |
Patrick McHardy | c0e912d | 2007-02-12 11:13:43 -0800 | [diff] [blame] | 728 | NF_CT_STAT_INC_ATOMIC(invalid); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 729 | return -ret; |
| 730 | } |
| 731 | |
| 732 | if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 733 | nf_conntrack_event_cache(IPCT_STATUS, skb); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 734 | |
| 735 | return ret; |
| 736 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 737 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 738 | |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame^] | 739 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
| 740 | const struct nf_conntrack_tuple *orig) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 741 | { |
Jan Engelhardt | 5f2b4c9 | 2008-04-14 11:15:53 +0200 | [diff] [blame^] | 742 | bool ret; |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 743 | |
| 744 | rcu_read_lock(); |
| 745 | ret = nf_ct_invert_tuple(inverse, orig, |
| 746 | __nf_ct_l3proto_find(orig->src.l3num), |
| 747 | __nf_ct_l4proto_find(orig->src.l3num, |
| 748 | orig->dst.protonum)); |
| 749 | rcu_read_unlock(); |
| 750 | return ret; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 751 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 752 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 753 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 754 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
| 755 | implicitly racy: see __nf_conntrack_confirm */ |
| 756 | void nf_conntrack_alter_reply(struct nf_conn *ct, |
| 757 | const struct nf_conntrack_tuple *newreply) |
| 758 | { |
| 759 | struct nf_conn_help *help = nfct_help(ct); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 760 | struct nf_conntrack_helper *helper; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 761 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 762 | /* Should be unconfirmed, so not in hash table yet */ |
| 763 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
| 764 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 765 | pr_debug("Altering reply tuple of %p to ", ct); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 766 | NF_CT_DUMP_TUPLE(newreply); |
| 767 | |
| 768 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 769 | if (ct->master || (help && help->expecting != 0)) |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 770 | return; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 771 | |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 772 | rcu_read_lock(); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 773 | helper = __nf_ct_helper_find(newreply); |
| 774 | if (helper == NULL) { |
| 775 | if (help) |
| 776 | rcu_assign_pointer(help->helper, NULL); |
| 777 | goto out; |
Yasuyuki Kozakai | 5d78a84 | 2007-05-10 14:16:24 -0700 | [diff] [blame] | 778 | } |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 779 | |
| 780 | if (help == NULL) { |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 781 | help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); |
| 782 | if (help == NULL) |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 783 | goto out; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 784 | } else { |
| 785 | memset(&help->help, 0, sizeof(help->help)); |
| 786 | } |
| 787 | |
| 788 | rcu_assign_pointer(help->helper, helper); |
| 789 | out: |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame] | 790 | rcu_read_unlock(); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 791 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 792 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 793 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 794 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
| 795 | void __nf_ct_refresh_acct(struct nf_conn *ct, |
| 796 | enum ip_conntrack_info ctinfo, |
| 797 | const struct sk_buff *skb, |
| 798 | unsigned long extra_jiffies, |
| 799 | int do_acct) |
| 800 | { |
| 801 | int event = 0; |
| 802 | |
| 803 | NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct); |
| 804 | NF_CT_ASSERT(skb); |
| 805 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 806 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 807 | |
Eric Leblond | 997ae83 | 2006-05-29 18:24:20 -0700 | [diff] [blame] | 808 | /* Only update if this is not a fixed timeout */ |
Patrick McHardy | 47d9504 | 2008-01-31 04:36:31 -0800 | [diff] [blame] | 809 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
| 810 | goto acct; |
Eric Leblond | 997ae83 | 2006-05-29 18:24:20 -0700 | [diff] [blame] | 811 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 812 | /* If not in hash table, timer will not be active yet */ |
| 813 | if (!nf_ct_is_confirmed(ct)) { |
| 814 | ct->timeout.expires = extra_jiffies; |
| 815 | event = IPCT_REFRESH; |
| 816 | } else { |
Martin Josefsson | be00c8e | 2006-11-29 02:35:12 +0100 | [diff] [blame] | 817 | unsigned long newtime = jiffies + extra_jiffies; |
| 818 | |
| 819 | /* Only update the timeout if the new timeout is at least |
| 820 | HZ jiffies from the old timeout. Need del_timer for race |
| 821 | avoidance (may already be dying). */ |
| 822 | if (newtime - ct->timeout.expires >= HZ |
| 823 | && del_timer(&ct->timeout)) { |
| 824 | ct->timeout.expires = newtime; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 825 | add_timer(&ct->timeout); |
| 826 | event = IPCT_REFRESH; |
| 827 | } |
| 828 | } |
| 829 | |
Patrick McHardy | 47d9504 | 2008-01-31 04:36:31 -0800 | [diff] [blame] | 830 | acct: |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 831 | #ifdef CONFIG_NF_CT_ACCT |
| 832 | if (do_acct) { |
| 833 | ct->counters[CTINFO2DIR(ctinfo)].packets++; |
| 834 | ct->counters[CTINFO2DIR(ctinfo)].bytes += |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 835 | skb->len - skb_network_offset(skb); |
Martin Josefsson | 3ffd5ee | 2006-11-29 02:35:10 +0100 | [diff] [blame] | 836 | |
| 837 | if ((ct->counters[CTINFO2DIR(ctinfo)].packets & 0x80000000) |
| 838 | || (ct->counters[CTINFO2DIR(ctinfo)].bytes & 0x80000000)) |
| 839 | event |= IPCT_COUNTER_FILLING; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 840 | } |
| 841 | #endif |
| 842 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 843 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 844 | |
| 845 | /* must be unlocked when calling event cache */ |
| 846 | if (event) |
| 847 | nf_conntrack_event_cache(event, skb); |
| 848 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 849 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 850 | |
Patrick McHardy | e281db5c | 2007-03-04 15:57:25 -0800 | [diff] [blame] | 851 | #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] | 852 | |
| 853 | #include <linux/netfilter/nfnetlink.h> |
| 854 | #include <linux/netfilter/nfnetlink_conntrack.h> |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 855 | #include <linux/mutex.h> |
| 856 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 857 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
| 858 | * in ip_conntrack_core, since we don't want the protocols to autoload |
| 859 | * or depend on ctnetlink */ |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 860 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 861 | const struct nf_conntrack_tuple *tuple) |
| 862 | { |
Patrick McHardy | 77236b6 | 2007-12-17 22:29:45 -0800 | [diff] [blame] | 863 | NLA_PUT_BE16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port); |
| 864 | 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] | 865 | return 0; |
| 866 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 867 | nla_put_failure: |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 868 | return -1; |
| 869 | } |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 870 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 871 | |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 872 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
| 873 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, |
| 874 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 875 | }; |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 876 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 877 | |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 878 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 879 | struct nf_conntrack_tuple *t) |
| 880 | { |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 881 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 882 | return -EINVAL; |
| 883 | |
Patrick McHardy | 77236b6 | 2007-12-17 22:29:45 -0800 | [diff] [blame] | 884 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
| 885 | 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] | 886 | |
| 887 | return 0; |
| 888 | } |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 889 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 890 | #endif |
| 891 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 892 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
Patrick McHardy | b334aad | 2008-01-14 23:48:57 -0800 | [diff] [blame] | 893 | 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] | 894 | { |
| 895 | struct nf_conn *ct; |
| 896 | enum ip_conntrack_info ctinfo; |
| 897 | |
| 898 | /* This ICMP is in reverse direction to the packet which caused it */ |
| 899 | ct = nf_ct_get(skb, &ctinfo); |
| 900 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) |
| 901 | ctinfo = IP_CT_RELATED + IP_CT_IS_REPLY; |
| 902 | else |
| 903 | ctinfo = IP_CT_RELATED; |
| 904 | |
| 905 | /* Attach to new skbuff, and increment count */ |
| 906 | nskb->nfct = &ct->ct_general; |
| 907 | nskb->nfctinfo = ctinfo; |
| 908 | nf_conntrack_get(nskb->nfct); |
| 909 | } |
| 910 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 911 | /* Bring out ya dead! */ |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 912 | static struct nf_conn * |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 913 | get_next_corpse(int (*iter)(struct nf_conn *i, void *data), |
| 914 | void *data, unsigned int *bucket) |
| 915 | { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 916 | struct nf_conntrack_tuple_hash *h; |
| 917 | struct nf_conn *ct; |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 918 | struct hlist_node *n; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 919 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 920 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 921 | for (; *bucket < nf_conntrack_htable_size; (*bucket)++) { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 922 | hlist_for_each_entry(h, n, &nf_conntrack_hash[*bucket], hnode) { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 923 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 924 | if (iter(ct, data)) |
| 925 | goto found; |
| 926 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 927 | } |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 928 | hlist_for_each_entry(h, n, &unconfirmed, hnode) { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 929 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 930 | if (iter(ct, data)) |
Patrick McHardy | ec68e97 | 2007-03-04 15:57:01 -0800 | [diff] [blame] | 931 | set_bit(IPS_DYING_BIT, &ct->status); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 932 | } |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 933 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 934 | return NULL; |
| 935 | found: |
Martin Josefsson | c073e3f | 2006-10-30 15:13:58 -0800 | [diff] [blame] | 936 | atomic_inc(&ct->ct_general.use); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 937 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 938 | return ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 939 | } |
| 940 | |
| 941 | void |
| 942 | nf_ct_iterate_cleanup(int (*iter)(struct nf_conn *i, void *data), void *data) |
| 943 | { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 944 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 945 | unsigned int bucket = 0; |
| 946 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 947 | while ((ct = get_next_corpse(iter, data, &bucket)) != NULL) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 948 | /* Time to push up daises... */ |
| 949 | if (del_timer(&ct->timeout)) |
| 950 | death_by_timeout((unsigned long)ct); |
| 951 | /* ... else the timer will get him soon. */ |
| 952 | |
| 953 | nf_ct_put(ct); |
| 954 | } |
| 955 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 956 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 957 | |
| 958 | static int kill_all(struct nf_conn *i, void *data) |
| 959 | { |
| 960 | return 1; |
| 961 | } |
| 962 | |
Stephen Hemminger | 96eb24d | 2008-01-31 04:07:29 -0800 | [diff] [blame] | 963 | void nf_ct_free_hashtable(struct hlist_head *hash, int vmalloced, unsigned int size) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 964 | { |
| 965 | if (vmalloced) |
| 966 | vfree(hash); |
| 967 | else |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 968 | free_pages((unsigned long)hash, |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 969 | get_order(sizeof(struct hlist_head) * size)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 970 | } |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 971 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 972 | |
Randy Dunlap | 272491e | 2006-12-07 01:17:24 -0800 | [diff] [blame] | 973 | void nf_conntrack_flush(void) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 974 | { |
| 975 | nf_ct_iterate_cleanup(kill_all, NULL); |
| 976 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 977 | EXPORT_SYMBOL_GPL(nf_conntrack_flush); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 978 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 979 | /* Mishearing the voices in his head, our hero wonders how he's |
| 980 | supposed to kill the mall. */ |
| 981 | void nf_conntrack_cleanup(void) |
| 982 | { |
Patrick McHardy | c3a47ab | 2007-02-12 11:09:19 -0800 | [diff] [blame] | 983 | rcu_assign_pointer(ip_ct_attach, NULL); |
Yasuyuki Kozakai | 7d3cdc6 | 2006-02-15 15:22:21 -0800 | [diff] [blame] | 984 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 985 | /* This makes sure all current packets have passed through |
| 986 | netfilter framework. Roll on, two-stage module |
| 987 | delete... */ |
| 988 | synchronize_net(); |
| 989 | |
| 990 | nf_ct_event_cache_flush(); |
| 991 | i_see_dead_people: |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 992 | nf_conntrack_flush(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 993 | if (atomic_read(&nf_conntrack_count) != 0) { |
| 994 | schedule(); |
| 995 | goto i_see_dead_people; |
| 996 | } |
Patrick McHardy | 6636568 | 2005-12-05 13:36:50 -0800 | [diff] [blame] | 997 | /* wait until all references to nf_conntrack_untracked are dropped */ |
| 998 | while (atomic_read(&nf_conntrack_untracked.ct_general.use) > 1) |
| 999 | schedule(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1000 | |
Yasuyuki Kozakai | de6e05c | 2007-03-23 11:17:27 -0700 | [diff] [blame] | 1001 | rcu_assign_pointer(nf_ct_destroy, NULL); |
| 1002 | |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 1003 | kmem_cache_destroy(nf_conntrack_cachep); |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1004 | nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_vmalloc, |
| 1005 | nf_conntrack_htable_size); |
KOVACS Krisztian | 5a6f294e4 | 2005-11-15 16:47:34 -0800 | [diff] [blame] | 1006 | |
Patrick McHardy | ac5357e | 2007-03-14 16:38:25 -0700 | [diff] [blame] | 1007 | nf_conntrack_proto_fini(); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 1008 | nf_conntrack_helper_fini(); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 1009 | nf_conntrack_expect_fini(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1010 | } |
| 1011 | |
Stephen Hemminger | 96eb24d | 2008-01-31 04:07:29 -0800 | [diff] [blame] | 1012 | struct hlist_head *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1013 | { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1014 | struct hlist_head *hash; |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 1015 | unsigned int size, i; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1016 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1017 | *vmalloced = 0; |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 1018 | |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1019 | size = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_head)); |
Andrew Morton | 29b6749 | 2007-10-29 21:41:19 -0700 | [diff] [blame] | 1020 | hash = (void*)__get_free_pages(GFP_KERNEL|__GFP_NOWARN, |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1021 | get_order(sizeof(struct hlist_head) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1022 | * size)); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1023 | if (!hash) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1024 | *vmalloced = 1; |
| 1025 | printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n"); |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1026 | hash = vmalloc(sizeof(struct hlist_head) * size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1027 | } |
| 1028 | |
| 1029 | if (hash) |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1030 | for (i = 0; i < size; i++) |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1031 | INIT_HLIST_HEAD(&hash[i]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1032 | |
| 1033 | return hash; |
| 1034 | } |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1035 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1036 | |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1037 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1038 | { |
Stephen Hemminger | 96eb24d | 2008-01-31 04:07:29 -0800 | [diff] [blame] | 1039 | int i, bucket, vmalloced, old_vmalloced; |
| 1040 | unsigned int hashsize, old_size; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1041 | int rnd; |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1042 | struct hlist_head *hash, *old_hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1043 | struct nf_conntrack_tuple_hash *h; |
| 1044 | |
| 1045 | /* On boot, we can set this without any fancy locking. */ |
| 1046 | if (!nf_conntrack_htable_size) |
| 1047 | return param_set_uint(val, kp); |
| 1048 | |
Stephen Hemminger | 96eb24d | 2008-01-31 04:07:29 -0800 | [diff] [blame] | 1049 | hashsize = simple_strtoul(val, NULL, 0); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1050 | if (!hashsize) |
| 1051 | return -EINVAL; |
| 1052 | |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1053 | hash = nf_ct_alloc_hashtable(&hashsize, &vmalloced); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1054 | if (!hash) |
| 1055 | return -ENOMEM; |
| 1056 | |
| 1057 | /* We have to rehahs for the new table anyway, so we also can |
| 1058 | * use a newrandom seed */ |
| 1059 | get_random_bytes(&rnd, 4); |
| 1060 | |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 1061 | /* Lookups in the old hash might happen in parallel, which means we |
| 1062 | * might get false negatives during connection lookup. New connections |
| 1063 | * created because of a false negative won't make it into the hash |
| 1064 | * though since that required taking the lock. |
| 1065 | */ |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1066 | spin_lock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1067 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1068 | while (!hlist_empty(&nf_conntrack_hash[i])) { |
| 1069 | h = hlist_entry(nf_conntrack_hash[i].first, |
| 1070 | struct nf_conntrack_tuple_hash, hnode); |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 1071 | hlist_del_rcu(&h->hnode); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1072 | bucket = __hash_conntrack(&h->tuple, hashsize, rnd); |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1073 | hlist_add_head(&h->hnode, &hash[bucket]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1074 | } |
| 1075 | } |
| 1076 | old_size = nf_conntrack_htable_size; |
| 1077 | old_vmalloced = nf_conntrack_vmalloc; |
| 1078 | old_hash = nf_conntrack_hash; |
| 1079 | |
| 1080 | nf_conntrack_htable_size = hashsize; |
| 1081 | nf_conntrack_vmalloc = vmalloced; |
| 1082 | nf_conntrack_hash = hash; |
| 1083 | nf_conntrack_hash_rnd = rnd; |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1084 | spin_unlock_bh(&nf_conntrack_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1085 | |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1086 | nf_ct_free_hashtable(old_hash, old_vmalloced, old_size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1087 | return 0; |
| 1088 | } |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1089 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1090 | |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1091 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1092 | &nf_conntrack_htable_size, 0600); |
| 1093 | |
| 1094 | int __init nf_conntrack_init(void) |
| 1095 | { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1096 | int max_factor = 8; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1097 | int ret; |
| 1098 | |
| 1099 | /* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1100 | * machine has 512 buckets. >= 1GB machines have 16384 buckets. */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1101 | if (!nf_conntrack_htable_size) { |
| 1102 | nf_conntrack_htable_size |
| 1103 | = (((num_physpages << PAGE_SHIFT) / 16384) |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1104 | / sizeof(struct hlist_head)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1105 | if (num_physpages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1106 | nf_conntrack_htable_size = 16384; |
| 1107 | if (nf_conntrack_htable_size < 32) |
| 1108 | nf_conntrack_htable_size = 32; |
| 1109 | |
| 1110 | /* Use a max. factor of four by default to get the same max as |
| 1111 | * with the old struct list_heads. When a table size is given |
| 1112 | * we use the old value of 8 to avoid reducing the max. |
| 1113 | * entries. */ |
| 1114 | max_factor = 4; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1115 | } |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1116 | nf_conntrack_hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size, |
| 1117 | &nf_conntrack_vmalloc); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1118 | if (!nf_conntrack_hash) { |
| 1119 | printk(KERN_ERR "Unable to create nf_conntrack_hash\n"); |
| 1120 | goto err_out; |
| 1121 | } |
| 1122 | |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1123 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 1124 | |
| 1125 | printk("nf_conntrack version %s (%u buckets, %d max)\n", |
| 1126 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, |
| 1127 | nf_conntrack_max); |
| 1128 | |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 1129 | nf_conntrack_cachep = kmem_cache_create("nf_conntrack", |
| 1130 | sizeof(struct nf_conn), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1131 | 0, 0, NULL); |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 1132 | if (!nf_conntrack_cachep) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1133 | printk(KERN_ERR "Unable to create nf_conn slab cache\n"); |
| 1134 | goto err_free_hash; |
| 1135 | } |
| 1136 | |
Patrick McHardy | ac5357e | 2007-03-14 16:38:25 -0700 | [diff] [blame] | 1137 | ret = nf_conntrack_proto_init(); |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 1138 | if (ret < 0) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 1139 | goto err_free_conntrack_slab; |
| 1140 | |
| 1141 | ret = nf_conntrack_expect_init(); |
| 1142 | if (ret < 0) |
| 1143 | goto out_fini_proto; |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 1144 | |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 1145 | ret = nf_conntrack_helper_init(); |
| 1146 | if (ret < 0) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 1147 | goto out_fini_expect; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 1148 | |
Yasuyuki Kozakai | 7d3cdc6 | 2006-02-15 15:22:21 -0800 | [diff] [blame] | 1149 | /* For use by REJECT target */ |
Patrick McHardy | b334aad | 2008-01-14 23:48:57 -0800 | [diff] [blame] | 1150 | rcu_assign_pointer(ip_ct_attach, nf_conntrack_attach); |
Yasuyuki Kozakai | de6e05c | 2007-03-23 11:17:27 -0700 | [diff] [blame] | 1151 | rcu_assign_pointer(nf_ct_destroy, destroy_conntrack); |
Yasuyuki Kozakai | 7d3cdc6 | 2006-02-15 15:22:21 -0800 | [diff] [blame] | 1152 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1153 | /* Set up fake conntrack: |
| 1154 | - to never be deleted, not in any hashes */ |
| 1155 | atomic_set(&nf_conntrack_untracked.ct_general.use, 1); |
| 1156 | /* - and look it like as a confirmed connection */ |
| 1157 | set_bit(IPS_CONFIRMED_BIT, &nf_conntrack_untracked.status); |
| 1158 | |
| 1159 | return ret; |
| 1160 | |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 1161 | out_fini_expect: |
| 1162 | nf_conntrack_expect_fini(); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 1163 | out_fini_proto: |
| 1164 | nf_conntrack_proto_fini(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1165 | err_free_conntrack_slab: |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 1166 | kmem_cache_destroy(nf_conntrack_cachep); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1167 | err_free_hash: |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1168 | nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_vmalloc, |
| 1169 | nf_conntrack_htable_size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1170 | err_out: |
| 1171 | return -ENOMEM; |
| 1172 | } |