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 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 43 | DEFINE_RWLOCK(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 | { |
| 76 | unsigned int a, b; |
Sami Farin | 9b88790 | 2007-03-14 16:43:00 -0700 | [diff] [blame] | 77 | |
| 78 | a = jhash2(tuple->src.u3.all, ARRAY_SIZE(tuple->src.u3.all), |
| 79 | (tuple->src.l3num << 16) | tuple->dst.protonum); |
| 80 | b = jhash2(tuple->dst.u3.all, ARRAY_SIZE(tuple->dst.u3.all), |
Al Viro | a34c458 | 2007-07-26 17:33:19 +0100 | [diff] [blame] | 81 | ((__force __u16)tuple->src.u.all << 16) | |
| 82 | (__force __u16)tuple->dst.u.all); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 83 | |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 84 | return ((u64)jhash_2words(a, b, rnd) * 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 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 93 | int |
| 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 | { |
| 103 | NF_CT_TUPLE_U_BLANK(tuple); |
| 104 | |
| 105 | tuple->src.l3num = l3num; |
| 106 | if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0) |
| 107 | return 0; |
| 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 | |
Yasuyuki Kozakai | e2a3123 | 2007-07-14 20:45:14 -0700 | [diff] [blame] | 116 | int nf_ct_get_tuplepr(const struct sk_buff *skb, |
| 117 | unsigned int nhoff, |
| 118 | u_int16_t l3num, |
| 119 | struct nf_conntrack_tuple *tuple) |
| 120 | { |
| 121 | struct nf_conntrack_l3proto *l3proto; |
| 122 | struct nf_conntrack_l4proto *l4proto; |
| 123 | unsigned int protoff; |
| 124 | u_int8_t protonum; |
| 125 | int ret; |
| 126 | |
| 127 | rcu_read_lock(); |
| 128 | |
| 129 | l3proto = __nf_ct_l3proto_find(l3num); |
| 130 | ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum); |
| 131 | if (ret != NF_ACCEPT) { |
| 132 | rcu_read_unlock(); |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | l4proto = __nf_ct_l4proto_find(l3num, protonum); |
| 137 | |
| 138 | ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, tuple, |
| 139 | l3proto, l4proto); |
| 140 | |
| 141 | rcu_read_unlock(); |
| 142 | return ret; |
| 143 | } |
| 144 | EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); |
| 145 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 146 | int |
| 147 | nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, |
| 148 | const struct nf_conntrack_tuple *orig, |
| 149 | const struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 150 | const struct nf_conntrack_l4proto *l4proto) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 151 | { |
| 152 | NF_CT_TUPLE_U_BLANK(inverse); |
| 153 | |
| 154 | inverse->src.l3num = orig->src.l3num; |
| 155 | if (l3proto->invert_tuple(inverse, orig) == 0) |
| 156 | return 0; |
| 157 | |
| 158 | inverse->dst.dir = !orig->dst.dir; |
| 159 | |
| 160 | inverse->dst.protonum = orig->dst.protonum; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 161 | return l4proto->invert_tuple(inverse, orig); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 162 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 163 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 164 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 165 | static void |
| 166 | clean_from_lists(struct nf_conn *ct) |
| 167 | { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 168 | pr_debug("clean_from_lists(%p)\n", ct); |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 169 | hlist_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode); |
| 170 | hlist_del(&ct->tuplehash[IP_CT_DIR_REPLY].hnode); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 171 | |
| 172 | /* Destroy all pending expectations */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 173 | nf_ct_remove_expectations(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 174 | } |
| 175 | |
| 176 | static void |
| 177 | destroy_conntrack(struct nf_conntrack *nfct) |
| 178 | { |
| 179 | struct nf_conn *ct = (struct nf_conn *)nfct; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 180 | struct nf_conntrack_l4proto *l4proto; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 181 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 182 | pr_debug("destroy_conntrack(%p)\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 183 | NF_CT_ASSERT(atomic_read(&nfct->use) == 0); |
| 184 | NF_CT_ASSERT(!timer_pending(&ct->timeout)); |
| 185 | |
| 186 | nf_conntrack_event(IPCT_DESTROY, ct); |
| 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 | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 193 | l4proto = __nf_ct_l4proto_find(ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.l3num, |
| 194 | ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 195 | if (l4proto && l4proto->destroy) |
| 196 | l4proto->destroy(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 197 | |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 198 | nf_ct_ext_destroy(ct); |
| 199 | |
Patrick McHardy | 982d9a9 | 2007-02-12 11:14:11 -0800 | [diff] [blame] | 200 | rcu_read_unlock(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 201 | |
| 202 | write_lock_bh(&nf_conntrack_lock); |
| 203 | /* Expectations will have been removed in clean_from_lists, |
| 204 | * except TFTP can create an expectation on the first packet, |
| 205 | * before connection is in the list, so we need to clean here, |
| 206 | * too. */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 207 | nf_ct_remove_expectations(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 208 | |
| 209 | /* We overload first tuple to link into unconfirmed list. */ |
| 210 | if (!nf_ct_is_confirmed(ct)) { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 211 | BUG_ON(hlist_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode)); |
| 212 | hlist_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 213 | } |
| 214 | |
| 215 | NF_CT_STAT_INC(delete); |
| 216 | write_unlock_bh(&nf_conntrack_lock); |
| 217 | |
| 218 | if (ct->master) |
| 219 | nf_ct_put(ct->master); |
| 220 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 221 | pr_debug("destroy_conntrack: returning ct=%p to slab\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 222 | nf_conntrack_free(ct); |
| 223 | } |
| 224 | |
| 225 | static void death_by_timeout(unsigned long ul_conntrack) |
| 226 | { |
| 227 | struct nf_conn *ct = (void *)ul_conntrack; |
Patrick McHardy | 5397e97 | 2007-05-19 14:23:52 -0700 | [diff] [blame] | 228 | struct nf_conn_help *help = nfct_help(ct); |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 229 | struct nf_conntrack_helper *helper; |
Patrick McHardy | 5397e97 | 2007-05-19 14:23:52 -0700 | [diff] [blame] | 230 | |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 231 | if (help) { |
| 232 | rcu_read_lock(); |
| 233 | helper = rcu_dereference(help->helper); |
| 234 | if (helper && helper->destroy) |
| 235 | helper->destroy(ct); |
| 236 | rcu_read_unlock(); |
| 237 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 238 | |
| 239 | write_lock_bh(&nf_conntrack_lock); |
| 240 | /* Inside lock so preempt is disabled on module removal path. |
| 241 | * Otherwise we can get spurious warnings. */ |
| 242 | NF_CT_STAT_INC(delete_list); |
| 243 | clean_from_lists(ct); |
| 244 | write_unlock_bh(&nf_conntrack_lock); |
| 245 | nf_ct_put(ct); |
| 246 | } |
| 247 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 248 | struct nf_conntrack_tuple_hash * |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 249 | __nf_conntrack_find(const struct nf_conntrack_tuple *tuple, |
| 250 | const struct nf_conn *ignored_conntrack) |
| 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 | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 256 | hlist_for_each_entry(h, n, &nf_conntrack_hash[hash], hnode) { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 257 | if (nf_ct_tuplehash_to_ctrack(h) != ignored_conntrack && |
| 258 | nf_ct_tuple_equal(tuple, &h->tuple)) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 259 | NF_CT_STAT_INC(found); |
| 260 | return h; |
| 261 | } |
| 262 | NF_CT_STAT_INC(searched); |
| 263 | } |
| 264 | |
| 265 | return NULL; |
| 266 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 267 | EXPORT_SYMBOL_GPL(__nf_conntrack_find); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 268 | |
| 269 | /* Find a connection corresponding to a tuple. */ |
| 270 | struct nf_conntrack_tuple_hash * |
Patrick McHardy | 330f7db | 2007-07-07 22:28:42 -0700 | [diff] [blame] | 271 | nf_conntrack_find_get(const struct nf_conntrack_tuple *tuple) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 272 | { |
| 273 | struct nf_conntrack_tuple_hash *h; |
| 274 | |
| 275 | read_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | 330f7db | 2007-07-07 22:28:42 -0700 | [diff] [blame] | 276 | h = __nf_conntrack_find(tuple, NULL); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 277 | if (h) |
| 278 | atomic_inc(&nf_ct_tuplehash_to_ctrack(h)->ct_general.use); |
| 279 | read_unlock_bh(&nf_conntrack_lock); |
| 280 | |
| 281 | return h; |
| 282 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 283 | EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 284 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 285 | static void __nf_conntrack_hash_insert(struct nf_conn *ct, |
| 286 | unsigned int hash, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 287 | unsigned int repl_hash) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 288 | { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 289 | hlist_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode, |
| 290 | &nf_conntrack_hash[hash]); |
| 291 | hlist_add_head(&ct->tuplehash[IP_CT_DIR_REPLY].hnode, |
| 292 | &nf_conntrack_hash[repl_hash]); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | void nf_conntrack_hash_insert(struct nf_conn *ct) |
| 296 | { |
| 297 | unsigned int hash, repl_hash; |
| 298 | |
| 299 | hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
| 300 | repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
| 301 | |
| 302 | write_lock_bh(&nf_conntrack_lock); |
| 303 | __nf_conntrack_hash_insert(ct, hash, repl_hash); |
| 304 | write_unlock_bh(&nf_conntrack_lock); |
| 305 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 306 | EXPORT_SYMBOL_GPL(nf_conntrack_hash_insert); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 307 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 308 | /* Confirm a connection given skb; places it in hash table */ |
| 309 | int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 310 | __nf_conntrack_confirm(struct sk_buff *skb) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 311 | { |
| 312 | unsigned int hash, repl_hash; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 313 | struct nf_conntrack_tuple_hash *h; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 314 | struct nf_conn *ct; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 315 | struct nf_conn_help *help; |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 316 | struct hlist_node *n; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 317 | enum ip_conntrack_info ctinfo; |
| 318 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 319 | ct = nf_ct_get(skb, &ctinfo); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 320 | |
| 321 | /* ipt_REJECT uses nf_conntrack_attach to attach related |
| 322 | ICMP/TCP RST packets in other direction. Actual packet |
| 323 | which created connection will be IP_CT_NEW or for an |
| 324 | expected connection, IP_CT_RELATED. */ |
| 325 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) |
| 326 | return NF_ACCEPT; |
| 327 | |
| 328 | hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); |
| 329 | repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
| 330 | |
| 331 | /* We're not in hash table, and we refuse to set up related |
| 332 | connections for unconfirmed conns. But packet copies and |
| 333 | REJECT will give spurious warnings here. */ |
| 334 | /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ |
| 335 | |
| 336 | /* No external references means noone else could have |
| 337 | confirmed us. */ |
| 338 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 339 | pr_debug("Confirming conntrack %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 340 | |
| 341 | write_lock_bh(&nf_conntrack_lock); |
| 342 | |
| 343 | /* See if there's one in the list already, including reverse: |
| 344 | NAT could have grabbed it without realizing, since we're |
| 345 | not in the hash. If there is, we lost race. */ |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 346 | hlist_for_each_entry(h, n, &nf_conntrack_hash[hash], hnode) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 347 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
| 348 | &h->tuple)) |
| 349 | goto out; |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 350 | hlist_for_each_entry(h, n, &nf_conntrack_hash[repl_hash], hnode) |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 351 | if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
| 352 | &h->tuple)) |
| 353 | goto out; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 354 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 355 | /* Remove from unconfirmed list */ |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 356 | hlist_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 357 | |
| 358 | __nf_conntrack_hash_insert(ct, hash, repl_hash); |
| 359 | /* Timer relative to confirmation time, not original |
| 360 | setting time, otherwise we'd get timer wrap in |
| 361 | weird delay cases. */ |
| 362 | ct->timeout.expires += jiffies; |
| 363 | add_timer(&ct->timeout); |
| 364 | atomic_inc(&ct->ct_general.use); |
| 365 | set_bit(IPS_CONFIRMED_BIT, &ct->status); |
| 366 | NF_CT_STAT_INC(insert); |
| 367 | write_unlock_bh(&nf_conntrack_lock); |
| 368 | help = nfct_help(ct); |
| 369 | if (help && help->helper) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 370 | nf_conntrack_event_cache(IPCT_HELPER, skb); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 371 | #ifdef CONFIG_NF_NAT_NEEDED |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 372 | if (test_bit(IPS_SRC_NAT_DONE_BIT, &ct->status) || |
| 373 | test_bit(IPS_DST_NAT_DONE_BIT, &ct->status)) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 374 | nf_conntrack_event_cache(IPCT_NATINFO, skb); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 375 | #endif |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 376 | nf_conntrack_event_cache(master_ct(ct) ? |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 377 | IPCT_RELATED : IPCT_NEW, skb); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 378 | return NF_ACCEPT; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 379 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 380 | out: |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 381 | NF_CT_STAT_INC(insert_failed); |
| 382 | write_unlock_bh(&nf_conntrack_lock); |
| 383 | return NF_DROP; |
| 384 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 385 | EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 386 | |
| 387 | /* Returns true if a connection correspondings to the tuple (required |
| 388 | for NAT). */ |
| 389 | int |
| 390 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, |
| 391 | const struct nf_conn *ignored_conntrack) |
| 392 | { |
| 393 | struct nf_conntrack_tuple_hash *h; |
| 394 | |
| 395 | read_lock_bh(&nf_conntrack_lock); |
| 396 | h = __nf_conntrack_find(tuple, ignored_conntrack); |
| 397 | read_unlock_bh(&nf_conntrack_lock); |
| 398 | |
| 399 | return h != NULL; |
| 400 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 401 | EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 402 | |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 403 | #define NF_CT_EVICTION_RANGE 8 |
| 404 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 405 | /* There's a small race here where we may free a just-assured |
| 406 | connection. Too bad: we're in trouble anyway. */ |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 407 | static int early_drop(unsigned int hash) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 408 | { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 409 | /* Use oldest entry, which is roughly LRU */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 410 | struct nf_conntrack_tuple_hash *h; |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 411 | struct nf_conn *ct = NULL, *tmp; |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 412 | struct hlist_node *n; |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 413 | unsigned int i, cnt = 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 414 | int dropped = 0; |
| 415 | |
| 416 | read_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 417 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
| 418 | hlist_for_each_entry(h, n, &nf_conntrack_hash[hash], hnode) { |
| 419 | tmp = nf_ct_tuplehash_to_ctrack(h); |
| 420 | if (!test_bit(IPS_ASSURED_BIT, &tmp->status)) |
| 421 | ct = tmp; |
| 422 | cnt++; |
| 423 | } |
| 424 | if (ct || cnt >= NF_CT_EVICTION_RANGE) |
| 425 | break; |
| 426 | hash = (hash + 1) % nf_conntrack_htable_size; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 427 | } |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 428 | if (ct) |
| 429 | atomic_inc(&ct->ct_general.use); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 430 | read_unlock_bh(&nf_conntrack_lock); |
| 431 | |
| 432 | if (!ct) |
| 433 | return dropped; |
| 434 | |
| 435 | if (del_timer(&ct->timeout)) { |
| 436 | death_by_timeout((unsigned long)ct); |
| 437 | dropped = 1; |
Patrick McHardy | c0e912d | 2007-02-12 11:13:43 -0800 | [diff] [blame] | 438 | NF_CT_STAT_INC_ATOMIC(early_drop); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 439 | } |
| 440 | nf_ct_put(ct); |
| 441 | return dropped; |
| 442 | } |
| 443 | |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 444 | struct nf_conn *nf_conntrack_alloc(const struct nf_conntrack_tuple *orig, |
| 445 | const struct nf_conntrack_tuple *repl) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 446 | { |
| 447 | struct nf_conn *conntrack = NULL; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 448 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 449 | if (unlikely(!nf_conntrack_hash_rnd_initted)) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 450 | get_random_bytes(&nf_conntrack_hash_rnd, 4); |
| 451 | nf_conntrack_hash_rnd_initted = 1; |
| 452 | } |
| 453 | |
Pablo Neira Ayuso | 5251e2d | 2006-09-20 12:01:06 -0700 | [diff] [blame] | 454 | /* We don't want any race condition at early drop stage */ |
| 455 | atomic_inc(&nf_conntrack_count); |
| 456 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 457 | if (nf_conntrack_max |
Pablo Neira Ayuso | 5251e2d | 2006-09-20 12:01:06 -0700 | [diff] [blame] | 458 | && atomic_read(&nf_conntrack_count) > nf_conntrack_max) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 459 | unsigned int hash = hash_conntrack(orig); |
Patrick McHardy | 7ae7730 | 2007-07-07 22:37:38 -0700 | [diff] [blame] | 460 | if (!early_drop(hash)) { |
Pablo Neira Ayuso | 5251e2d | 2006-09-20 12:01:06 -0700 | [diff] [blame] | 461 | atomic_dec(&nf_conntrack_count); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 462 | if (net_ratelimit()) |
| 463 | printk(KERN_WARNING |
| 464 | "nf_conntrack: table full, dropping" |
| 465 | " packet.\n"); |
| 466 | return ERR_PTR(-ENOMEM); |
| 467 | } |
| 468 | } |
| 469 | |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 470 | conntrack = kmem_cache_zalloc(nf_conntrack_cachep, GFP_ATOMIC); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 471 | if (conntrack == NULL) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 472 | pr_debug("nf_conntrack_alloc: Can't alloc conntrack.\n"); |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 473 | atomic_dec(&nf_conntrack_count); |
| 474 | return ERR_PTR(-ENOMEM); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 475 | } |
| 476 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 477 | atomic_set(&conntrack->ct_general.use, 1); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 478 | conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
| 479 | conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
| 480 | /* Don't set timer yet: wait for confirmation */ |
Patrick McHardy | e6f689d | 2007-03-23 11:16:30 -0700 | [diff] [blame] | 481 | setup_timer(&conntrack->timeout, death_by_timeout, |
| 482 | (unsigned long)conntrack); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 483 | |
Pablo Neira Ayuso | 5251e2d | 2006-09-20 12:01:06 -0700 | [diff] [blame] | 484 | return conntrack; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 485 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 486 | EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 487 | |
| 488 | void nf_conntrack_free(struct nf_conn *conntrack) |
| 489 | { |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 490 | nf_ct_ext_free(conntrack); |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 491 | kmem_cache_free(nf_conntrack_cachep, conntrack); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 492 | atomic_dec(&nf_conntrack_count); |
| 493 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 494 | EXPORT_SYMBOL_GPL(nf_conntrack_free); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 495 | |
| 496 | /* Allocate a new conntrack: we return -ENOMEM if classification |
| 497 | failed due to stress. Otherwise it really is unclassifiable. */ |
| 498 | static struct nf_conntrack_tuple_hash * |
| 499 | init_conntrack(const struct nf_conntrack_tuple *tuple, |
| 500 | struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 501 | struct nf_conntrack_l4proto *l4proto, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 502 | struct sk_buff *skb, |
| 503 | unsigned int dataoff) |
| 504 | { |
| 505 | struct nf_conn *conntrack; |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 506 | struct nf_conn_help *help; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 507 | struct nf_conntrack_tuple repl_tuple; |
| 508 | struct nf_conntrack_expect *exp; |
| 509 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 510 | if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 511 | pr_debug("Can't invert tuple.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 512 | return NULL; |
| 513 | } |
| 514 | |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 515 | conntrack = nf_conntrack_alloc(tuple, &repl_tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 516 | if (conntrack == NULL || IS_ERR(conntrack)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 517 | pr_debug("Can't allocate conntrack.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 518 | return (struct nf_conntrack_tuple_hash *)conntrack; |
| 519 | } |
| 520 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 521 | if (!l4proto->new(conntrack, skb, dataoff)) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 522 | nf_conntrack_free(conntrack); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 523 | pr_debug("init conntrack: can't track with proto module\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 524 | return NULL; |
| 525 | } |
| 526 | |
| 527 | write_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 528 | exp = nf_ct_find_expectation(tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 529 | if (exp) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 530 | pr_debug("conntrack: expectation arrives ct=%p exp=%p\n", |
| 531 | conntrack, exp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 532 | /* Welcome, Mr. Bond. We've been expecting you... */ |
| 533 | __set_bit(IPS_EXPECTED_BIT, &conntrack->status); |
| 534 | conntrack->master = exp->master; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 535 | if (exp->helper) { |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 536 | help = nf_ct_helper_ext_add(conntrack, GFP_ATOMIC); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 537 | if (help) |
| 538 | rcu_assign_pointer(help->helper, exp->helper); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 539 | } |
| 540 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 541 | #ifdef CONFIG_NF_CONNTRACK_MARK |
| 542 | conntrack->mark = exp->master->mark; |
| 543 | #endif |
James Morris | 7c9728c | 2006-06-09 00:31:46 -0700 | [diff] [blame] | 544 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
| 545 | conntrack->secmark = exp->master->secmark; |
| 546 | #endif |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 547 | nf_conntrack_get(&conntrack->master->ct_general); |
| 548 | NF_CT_STAT_INC(expect_new); |
Yasuyuki Kozakai | 22e7410 | 2006-11-27 10:25:59 -0800 | [diff] [blame] | 549 | } else { |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 550 | struct nf_conntrack_helper *helper; |
| 551 | |
| 552 | helper = __nf_ct_helper_find(&repl_tuple); |
| 553 | if (helper) { |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 554 | help = nf_ct_helper_ext_add(conntrack, GFP_ATOMIC); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 555 | if (help) |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 556 | rcu_assign_pointer(help->helper, helper); |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 557 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 558 | NF_CT_STAT_INC(new); |
Yasuyuki Kozakai | 22e7410 | 2006-11-27 10:25:59 -0800 | [diff] [blame] | 559 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 560 | |
| 561 | /* Overload tuple linked list to put us in unconfirmed list. */ |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 562 | hlist_add_head(&conntrack->tuplehash[IP_CT_DIR_ORIGINAL].hnode, |
| 563 | &unconfirmed); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 564 | |
| 565 | write_unlock_bh(&nf_conntrack_lock); |
| 566 | |
| 567 | if (exp) { |
| 568 | if (exp->expectfn) |
| 569 | exp->expectfn(conntrack, exp); |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 570 | nf_ct_expect_put(exp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 571 | } |
| 572 | |
| 573 | return &conntrack->tuplehash[IP_CT_DIR_ORIGINAL]; |
| 574 | } |
| 575 | |
| 576 | /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ |
| 577 | static inline struct nf_conn * |
| 578 | resolve_normal_ct(struct sk_buff *skb, |
| 579 | unsigned int dataoff, |
| 580 | u_int16_t l3num, |
| 581 | u_int8_t protonum, |
| 582 | struct nf_conntrack_l3proto *l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 583 | struct nf_conntrack_l4proto *l4proto, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 584 | int *set_reply, |
| 585 | enum ip_conntrack_info *ctinfo) |
| 586 | { |
| 587 | struct nf_conntrack_tuple tuple; |
| 588 | struct nf_conntrack_tuple_hash *h; |
| 589 | struct nf_conn *ct; |
| 590 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 591 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 592 | dataoff, l3num, protonum, &tuple, l3proto, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 593 | l4proto)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 594 | pr_debug("resolve_normal_ct: Can't get tuple\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 595 | return NULL; |
| 596 | } |
| 597 | |
| 598 | /* look for tuple match */ |
Patrick McHardy | 330f7db | 2007-07-07 22:28:42 -0700 | [diff] [blame] | 599 | h = nf_conntrack_find_get(&tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 600 | if (!h) { |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 601 | h = init_conntrack(&tuple, l3proto, l4proto, skb, dataoff); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 602 | if (!h) |
| 603 | return NULL; |
| 604 | if (IS_ERR(h)) |
| 605 | return (void *)h; |
| 606 | } |
| 607 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 608 | |
| 609 | /* It exists; we have (non-exclusive) reference. */ |
| 610 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { |
| 611 | *ctinfo = IP_CT_ESTABLISHED + IP_CT_IS_REPLY; |
| 612 | /* Please set reply bit if this packet OK */ |
| 613 | *set_reply = 1; |
| 614 | } else { |
| 615 | /* Once we've had two way comms, always ESTABLISHED. */ |
| 616 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 617 | pr_debug("nf_conntrack_in: normal packet for %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 618 | *ctinfo = IP_CT_ESTABLISHED; |
| 619 | } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 620 | pr_debug("nf_conntrack_in: related packet for %p\n", |
| 621 | ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 622 | *ctinfo = IP_CT_RELATED; |
| 623 | } else { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 624 | pr_debug("nf_conntrack_in: new packet for %p\n", ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 625 | *ctinfo = IP_CT_NEW; |
| 626 | } |
| 627 | *set_reply = 0; |
| 628 | } |
| 629 | skb->nfct = &ct->ct_general; |
| 630 | skb->nfctinfo = *ctinfo; |
| 631 | return ct; |
| 632 | } |
| 633 | |
| 634 | unsigned int |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 635 | nf_conntrack_in(int pf, unsigned int hooknum, struct sk_buff *skb) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 636 | { |
| 637 | struct nf_conn *ct; |
| 638 | enum ip_conntrack_info ctinfo; |
| 639 | struct nf_conntrack_l3proto *l3proto; |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 640 | struct nf_conntrack_l4proto *l4proto; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 641 | unsigned int dataoff; |
| 642 | u_int8_t protonum; |
| 643 | int set_reply = 0; |
| 644 | int ret; |
| 645 | |
| 646 | /* Previously seen (loopback or untracked)? Ignore. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 647 | if (skb->nfct) { |
Patrick McHardy | c0e912d | 2007-02-12 11:13:43 -0800 | [diff] [blame] | 648 | NF_CT_STAT_INC_ATOMIC(ignore); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 649 | return NF_ACCEPT; |
| 650 | } |
| 651 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 652 | /* rcu_read_lock()ed by nf_hook_slow */ |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 653 | l3proto = __nf_ct_l3proto_find((u_int16_t)pf); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 654 | ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
Yasuyuki Kozakai | ffc3069 | 2007-07-14 20:44:50 -0700 | [diff] [blame] | 655 | &dataoff, &protonum); |
| 656 | if (ret <= 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 657 | pr_debug("not prepared to track yet or error occured\n"); |
Yasuyuki Kozakai | d87d846 | 2007-07-14 20:44:23 -0700 | [diff] [blame] | 658 | NF_CT_STAT_INC_ATOMIC(error); |
| 659 | NF_CT_STAT_INC_ATOMIC(invalid); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 660 | return -ret; |
| 661 | } |
| 662 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 663 | l4proto = __nf_ct_l4proto_find((u_int16_t)pf, protonum); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 664 | |
| 665 | /* It may be an special packet, error, unclean... |
| 666 | * inverse of the return code tells to the netfilter |
| 667 | * core what to do with the packet. */ |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 668 | if (l4proto->error != NULL && |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 669 | (ret = l4proto->error(skb, dataoff, &ctinfo, pf, hooknum)) <= 0) { |
Patrick McHardy | c0e912d | 2007-02-12 11:13:43 -0800 | [diff] [blame] | 670 | NF_CT_STAT_INC_ATOMIC(error); |
| 671 | NF_CT_STAT_INC_ATOMIC(invalid); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 672 | return -ret; |
| 673 | } |
| 674 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 675 | ct = resolve_normal_ct(skb, dataoff, pf, protonum, l3proto, l4proto, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 676 | &set_reply, &ctinfo); |
| 677 | if (!ct) { |
| 678 | /* Not valid part of a connection */ |
Patrick McHardy | c0e912d | 2007-02-12 11:13:43 -0800 | [diff] [blame] | 679 | NF_CT_STAT_INC_ATOMIC(invalid); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 680 | return NF_ACCEPT; |
| 681 | } |
| 682 | |
| 683 | if (IS_ERR(ct)) { |
| 684 | /* Too stressed to deal. */ |
Patrick McHardy | c0e912d | 2007-02-12 11:13:43 -0800 | [diff] [blame] | 685 | NF_CT_STAT_INC_ATOMIC(drop); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 686 | return NF_DROP; |
| 687 | } |
| 688 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 689 | NF_CT_ASSERT(skb->nfct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 690 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 691 | ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 692 | if (ret < 0) { |
| 693 | /* Invalid: inverse of the return code tells |
| 694 | * the netfilter core what to do */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 695 | pr_debug("nf_conntrack_in: Can't track with proto module\n"); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 696 | nf_conntrack_put(skb->nfct); |
| 697 | skb->nfct = NULL; |
Patrick McHardy | c0e912d | 2007-02-12 11:13:43 -0800 | [diff] [blame] | 698 | NF_CT_STAT_INC_ATOMIC(invalid); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 699 | return -ret; |
| 700 | } |
| 701 | |
| 702 | 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] | 703 | nf_conntrack_event_cache(IPCT_STATUS, skb); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 704 | |
| 705 | return ret; |
| 706 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 707 | EXPORT_SYMBOL_GPL(nf_conntrack_in); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 708 | |
| 709 | int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
| 710 | const struct nf_conntrack_tuple *orig) |
| 711 | { |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 712 | int ret; |
| 713 | |
| 714 | rcu_read_lock(); |
| 715 | ret = nf_ct_invert_tuple(inverse, orig, |
| 716 | __nf_ct_l3proto_find(orig->src.l3num), |
| 717 | __nf_ct_l4proto_find(orig->src.l3num, |
| 718 | orig->dst.protonum)); |
| 719 | rcu_read_unlock(); |
| 720 | return ret; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 721 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 722 | EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 723 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 724 | /* Alter reply tuple (maybe alter helper). This is for NAT, and is |
| 725 | implicitly racy: see __nf_conntrack_confirm */ |
| 726 | void nf_conntrack_alter_reply(struct nf_conn *ct, |
| 727 | const struct nf_conntrack_tuple *newreply) |
| 728 | { |
| 729 | struct nf_conn_help *help = nfct_help(ct); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 730 | struct nf_conntrack_helper *helper; |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 731 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 732 | /* Should be unconfirmed, so not in hash table yet */ |
| 733 | NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
| 734 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 735 | pr_debug("Altering reply tuple of %p to ", ct); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 736 | NF_CT_DUMP_TUPLE(newreply); |
| 737 | |
| 738 | ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 739 | if (ct->master || (help && help->expecting != 0)) |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame^] | 740 | return; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 741 | |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame^] | 742 | rcu_read_lock(); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 743 | helper = __nf_ct_helper_find(newreply); |
| 744 | if (helper == NULL) { |
| 745 | if (help) |
| 746 | rcu_assign_pointer(help->helper, NULL); |
| 747 | goto out; |
Yasuyuki Kozakai | 5d78a84 | 2007-05-10 14:16:24 -0700 | [diff] [blame] | 748 | } |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 749 | |
| 750 | if (help == NULL) { |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 751 | help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); |
| 752 | if (help == NULL) |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 753 | goto out; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 754 | } else { |
| 755 | memset(&help->help, 0, sizeof(help->help)); |
| 756 | } |
| 757 | |
| 758 | rcu_assign_pointer(help->helper, helper); |
| 759 | out: |
Patrick McHardy | c52fbb4 | 2008-01-31 04:37:36 -0800 | [diff] [blame^] | 760 | rcu_read_unlock(); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 761 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 762 | EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 763 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 764 | /* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ |
| 765 | void __nf_ct_refresh_acct(struct nf_conn *ct, |
| 766 | enum ip_conntrack_info ctinfo, |
| 767 | const struct sk_buff *skb, |
| 768 | unsigned long extra_jiffies, |
| 769 | int do_acct) |
| 770 | { |
| 771 | int event = 0; |
| 772 | |
| 773 | NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct); |
| 774 | NF_CT_ASSERT(skb); |
| 775 | |
| 776 | write_lock_bh(&nf_conntrack_lock); |
| 777 | |
Eric Leblond | 997ae83 | 2006-05-29 18:24:20 -0700 | [diff] [blame] | 778 | /* Only update if this is not a fixed timeout */ |
Patrick McHardy | 47d9504 | 2008-01-31 04:36:31 -0800 | [diff] [blame] | 779 | if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) |
| 780 | goto acct; |
Eric Leblond | 997ae83 | 2006-05-29 18:24:20 -0700 | [diff] [blame] | 781 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 782 | /* If not in hash table, timer will not be active yet */ |
| 783 | if (!nf_ct_is_confirmed(ct)) { |
| 784 | ct->timeout.expires = extra_jiffies; |
| 785 | event = IPCT_REFRESH; |
| 786 | } else { |
Martin Josefsson | be00c8e | 2006-11-29 02:35:12 +0100 | [diff] [blame] | 787 | unsigned long newtime = jiffies + extra_jiffies; |
| 788 | |
| 789 | /* Only update the timeout if the new timeout is at least |
| 790 | HZ jiffies from the old timeout. Need del_timer for race |
| 791 | avoidance (may already be dying). */ |
| 792 | if (newtime - ct->timeout.expires >= HZ |
| 793 | && del_timer(&ct->timeout)) { |
| 794 | ct->timeout.expires = newtime; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 795 | add_timer(&ct->timeout); |
| 796 | event = IPCT_REFRESH; |
| 797 | } |
| 798 | } |
| 799 | |
Patrick McHardy | 47d9504 | 2008-01-31 04:36:31 -0800 | [diff] [blame] | 800 | acct: |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 801 | #ifdef CONFIG_NF_CT_ACCT |
| 802 | if (do_acct) { |
| 803 | ct->counters[CTINFO2DIR(ctinfo)].packets++; |
| 804 | ct->counters[CTINFO2DIR(ctinfo)].bytes += |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 805 | skb->len - skb_network_offset(skb); |
Martin Josefsson | 3ffd5ee | 2006-11-29 02:35:10 +0100 | [diff] [blame] | 806 | |
| 807 | if ((ct->counters[CTINFO2DIR(ctinfo)].packets & 0x80000000) |
| 808 | || (ct->counters[CTINFO2DIR(ctinfo)].bytes & 0x80000000)) |
| 809 | event |= IPCT_COUNTER_FILLING; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 810 | } |
| 811 | #endif |
| 812 | |
| 813 | write_unlock_bh(&nf_conntrack_lock); |
| 814 | |
| 815 | /* must be unlocked when calling event cache */ |
| 816 | if (event) |
| 817 | nf_conntrack_event_cache(event, skb); |
| 818 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 819 | EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 820 | |
Patrick McHardy | e281db5c | 2007-03-04 15:57:25 -0800 | [diff] [blame] | 821 | #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] | 822 | |
| 823 | #include <linux/netfilter/nfnetlink.h> |
| 824 | #include <linux/netfilter/nfnetlink_conntrack.h> |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 825 | #include <linux/mutex.h> |
| 826 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 827 | /* Generic function for tcp/udp/sctp/dccp and alike. This needs to be |
| 828 | * in ip_conntrack_core, since we don't want the protocols to autoload |
| 829 | * or depend on ctnetlink */ |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 830 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 831 | const struct nf_conntrack_tuple *tuple) |
| 832 | { |
Patrick McHardy | 77236b6 | 2007-12-17 22:29:45 -0800 | [diff] [blame] | 833 | NLA_PUT_BE16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port); |
| 834 | 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] | 835 | return 0; |
| 836 | |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 837 | nla_put_failure: |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 838 | return -1; |
| 839 | } |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 840 | EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 841 | |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 842 | const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { |
| 843 | [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, |
| 844 | [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 845 | }; |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 846 | EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 847 | |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 848 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 849 | struct nf_conntrack_tuple *t) |
| 850 | { |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 851 | if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 852 | return -EINVAL; |
| 853 | |
Patrick McHardy | 77236b6 | 2007-12-17 22:29:45 -0800 | [diff] [blame] | 854 | t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); |
| 855 | 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] | 856 | |
| 857 | return 0; |
| 858 | } |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 859 | EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 860 | #endif |
| 861 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 862 | /* Used by ipt_REJECT and ip6t_REJECT. */ |
Patrick McHardy | b334aad | 2008-01-14 23:48:57 -0800 | [diff] [blame] | 863 | 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] | 864 | { |
| 865 | struct nf_conn *ct; |
| 866 | enum ip_conntrack_info ctinfo; |
| 867 | |
| 868 | /* This ICMP is in reverse direction to the packet which caused it */ |
| 869 | ct = nf_ct_get(skb, &ctinfo); |
| 870 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) |
| 871 | ctinfo = IP_CT_RELATED + IP_CT_IS_REPLY; |
| 872 | else |
| 873 | ctinfo = IP_CT_RELATED; |
| 874 | |
| 875 | /* Attach to new skbuff, and increment count */ |
| 876 | nskb->nfct = &ct->ct_general; |
| 877 | nskb->nfctinfo = ctinfo; |
| 878 | nf_conntrack_get(nskb->nfct); |
| 879 | } |
| 880 | |
| 881 | static inline int |
| 882 | do_iter(const struct nf_conntrack_tuple_hash *i, |
| 883 | int (*iter)(struct nf_conn *i, void *data), |
| 884 | void *data) |
| 885 | { |
| 886 | return iter(nf_ct_tuplehash_to_ctrack(i), data); |
| 887 | } |
| 888 | |
| 889 | /* Bring out ya dead! */ |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 890 | static struct nf_conn * |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 891 | get_next_corpse(int (*iter)(struct nf_conn *i, void *data), |
| 892 | void *data, unsigned int *bucket) |
| 893 | { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 894 | struct nf_conntrack_tuple_hash *h; |
| 895 | struct nf_conn *ct; |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 896 | struct hlist_node *n; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 897 | |
| 898 | write_lock_bh(&nf_conntrack_lock); |
| 899 | for (; *bucket < nf_conntrack_htable_size; (*bucket)++) { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 900 | hlist_for_each_entry(h, n, &nf_conntrack_hash[*bucket], hnode) { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 901 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 902 | if (iter(ct, data)) |
| 903 | goto found; |
| 904 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 905 | } |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 906 | hlist_for_each_entry(h, n, &unconfirmed, hnode) { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 907 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 908 | if (iter(ct, data)) |
Patrick McHardy | ec68e97 | 2007-03-04 15:57:01 -0800 | [diff] [blame] | 909 | set_bit(IPS_DYING_BIT, &ct->status); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 910 | } |
Martin Josefsson | c073e3f | 2006-10-30 15:13:58 -0800 | [diff] [blame] | 911 | write_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 912 | return NULL; |
| 913 | found: |
Martin Josefsson | c073e3f | 2006-10-30 15:13:58 -0800 | [diff] [blame] | 914 | atomic_inc(&ct->ct_general.use); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 915 | write_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 916 | return ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 917 | } |
| 918 | |
| 919 | void |
| 920 | nf_ct_iterate_cleanup(int (*iter)(struct nf_conn *i, void *data), void *data) |
| 921 | { |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 922 | struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 923 | unsigned int bucket = 0; |
| 924 | |
Patrick McHardy | df0933d | 2006-09-20 11:57:53 -0700 | [diff] [blame] | 925 | while ((ct = get_next_corpse(iter, data, &bucket)) != NULL) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 926 | /* Time to push up daises... */ |
| 927 | if (del_timer(&ct->timeout)) |
| 928 | death_by_timeout((unsigned long)ct); |
| 929 | /* ... else the timer will get him soon. */ |
| 930 | |
| 931 | nf_ct_put(ct); |
| 932 | } |
| 933 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 934 | EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 935 | |
| 936 | static int kill_all(struct nf_conn *i, void *data) |
| 937 | { |
| 938 | return 1; |
| 939 | } |
| 940 | |
Stephen Hemminger | 96eb24d | 2008-01-31 04:07:29 -0800 | [diff] [blame] | 941 | 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] | 942 | { |
| 943 | if (vmalloced) |
| 944 | vfree(hash); |
| 945 | else |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 946 | free_pages((unsigned long)hash, |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 947 | get_order(sizeof(struct hlist_head) * size)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 948 | } |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 949 | EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 950 | |
Randy Dunlap | 272491e | 2006-12-07 01:17:24 -0800 | [diff] [blame] | 951 | void nf_conntrack_flush(void) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 952 | { |
| 953 | nf_ct_iterate_cleanup(kill_all, NULL); |
| 954 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 955 | EXPORT_SYMBOL_GPL(nf_conntrack_flush); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 956 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 957 | /* Mishearing the voices in his head, our hero wonders how he's |
| 958 | supposed to kill the mall. */ |
| 959 | void nf_conntrack_cleanup(void) |
| 960 | { |
Patrick McHardy | c3a47ab | 2007-02-12 11:09:19 -0800 | [diff] [blame] | 961 | rcu_assign_pointer(ip_ct_attach, NULL); |
Yasuyuki Kozakai | 7d3cdc6 | 2006-02-15 15:22:21 -0800 | [diff] [blame] | 962 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 963 | /* This makes sure all current packets have passed through |
| 964 | netfilter framework. Roll on, two-stage module |
| 965 | delete... */ |
| 966 | synchronize_net(); |
| 967 | |
| 968 | nf_ct_event_cache_flush(); |
| 969 | i_see_dead_people: |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 970 | nf_conntrack_flush(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 971 | if (atomic_read(&nf_conntrack_count) != 0) { |
| 972 | schedule(); |
| 973 | goto i_see_dead_people; |
| 974 | } |
Patrick McHardy | 6636568 | 2005-12-05 13:36:50 -0800 | [diff] [blame] | 975 | /* wait until all references to nf_conntrack_untracked are dropped */ |
| 976 | while (atomic_read(&nf_conntrack_untracked.ct_general.use) > 1) |
| 977 | schedule(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 978 | |
Yasuyuki Kozakai | de6e05c | 2007-03-23 11:17:27 -0700 | [diff] [blame] | 979 | rcu_assign_pointer(nf_ct_destroy, NULL); |
| 980 | |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 981 | kmem_cache_destroy(nf_conntrack_cachep); |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 982 | nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_vmalloc, |
| 983 | nf_conntrack_htable_size); |
KOVACS Krisztian | 5a6f294 | 2005-11-15 16:47:34 -0800 | [diff] [blame] | 984 | |
Patrick McHardy | ac5357e | 2007-03-14 16:38:25 -0700 | [diff] [blame] | 985 | nf_conntrack_proto_fini(); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 986 | nf_conntrack_helper_fini(); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 987 | nf_conntrack_expect_fini(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 988 | } |
| 989 | |
Stephen Hemminger | 96eb24d | 2008-01-31 04:07:29 -0800 | [diff] [blame] | 990 | struct hlist_head *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 991 | { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 992 | struct hlist_head *hash; |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 993 | unsigned int size, i; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 994 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 995 | *vmalloced = 0; |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 996 | |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 997 | size = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_head)); |
Andrew Morton | 29b6749 | 2007-10-29 21:41:19 -0700 | [diff] [blame] | 998 | hash = (void*)__get_free_pages(GFP_KERNEL|__GFP_NOWARN, |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 999 | get_order(sizeof(struct hlist_head) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1000 | * size)); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1001 | if (!hash) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1002 | *vmalloced = 1; |
| 1003 | printk(KERN_WARNING "nf_conntrack: falling back to vmalloc.\n"); |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1004 | hash = vmalloc(sizeof(struct hlist_head) * size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1005 | } |
| 1006 | |
| 1007 | if (hash) |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1008 | for (i = 0; i < size; i++) |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1009 | INIT_HLIST_HEAD(&hash[i]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1010 | |
| 1011 | return hash; |
| 1012 | } |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1013 | EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1014 | |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1015 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1016 | { |
Stephen Hemminger | 96eb24d | 2008-01-31 04:07:29 -0800 | [diff] [blame] | 1017 | int i, bucket, vmalloced, old_vmalloced; |
| 1018 | unsigned int hashsize, old_size; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1019 | int rnd; |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1020 | struct hlist_head *hash, *old_hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1021 | struct nf_conntrack_tuple_hash *h; |
| 1022 | |
| 1023 | /* On boot, we can set this without any fancy locking. */ |
| 1024 | if (!nf_conntrack_htable_size) |
| 1025 | return param_set_uint(val, kp); |
| 1026 | |
Stephen Hemminger | 96eb24d | 2008-01-31 04:07:29 -0800 | [diff] [blame] | 1027 | hashsize = simple_strtoul(val, NULL, 0); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1028 | if (!hashsize) |
| 1029 | return -EINVAL; |
| 1030 | |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1031 | hash = nf_ct_alloc_hashtable(&hashsize, &vmalloced); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1032 | if (!hash) |
| 1033 | return -ENOMEM; |
| 1034 | |
| 1035 | /* We have to rehahs for the new table anyway, so we also can |
| 1036 | * use a newrandom seed */ |
| 1037 | get_random_bytes(&rnd, 4); |
| 1038 | |
| 1039 | write_lock_bh(&nf_conntrack_lock); |
| 1040 | for (i = 0; i < nf_conntrack_htable_size; i++) { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1041 | while (!hlist_empty(&nf_conntrack_hash[i])) { |
| 1042 | h = hlist_entry(nf_conntrack_hash[i].first, |
| 1043 | struct nf_conntrack_tuple_hash, hnode); |
| 1044 | hlist_del(&h->hnode); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1045 | bucket = __hash_conntrack(&h->tuple, hashsize, rnd); |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1046 | hlist_add_head(&h->hnode, &hash[bucket]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1047 | } |
| 1048 | } |
| 1049 | old_size = nf_conntrack_htable_size; |
| 1050 | old_vmalloced = nf_conntrack_vmalloc; |
| 1051 | old_hash = nf_conntrack_hash; |
| 1052 | |
| 1053 | nf_conntrack_htable_size = hashsize; |
| 1054 | nf_conntrack_vmalloc = vmalloced; |
| 1055 | nf_conntrack_hash = hash; |
| 1056 | nf_conntrack_hash_rnd = rnd; |
| 1057 | write_unlock_bh(&nf_conntrack_lock); |
| 1058 | |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1059 | nf_ct_free_hashtable(old_hash, old_vmalloced, old_size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1060 | return 0; |
| 1061 | } |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1062 | EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1063 | |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 1064 | module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1065 | &nf_conntrack_htable_size, 0600); |
| 1066 | |
| 1067 | int __init nf_conntrack_init(void) |
| 1068 | { |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1069 | int max_factor = 8; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1070 | int ret; |
| 1071 | |
| 1072 | /* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1073 | * machine has 512 buckets. >= 1GB machines have 16384 buckets. */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1074 | if (!nf_conntrack_htable_size) { |
| 1075 | nf_conntrack_htable_size |
| 1076 | = (((num_physpages << PAGE_SHIFT) / 16384) |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1077 | / sizeof(struct hlist_head)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1078 | if (num_physpages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1079 | nf_conntrack_htable_size = 16384; |
| 1080 | if (nf_conntrack_htable_size < 32) |
| 1081 | nf_conntrack_htable_size = 32; |
| 1082 | |
| 1083 | /* Use a max. factor of four by default to get the same max as |
| 1084 | * with the old struct list_heads. When a table size is given |
| 1085 | * we use the old value of 8 to avoid reducing the max. |
| 1086 | * entries. */ |
| 1087 | max_factor = 4; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1088 | } |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1089 | nf_conntrack_hash = nf_ct_alloc_hashtable(&nf_conntrack_htable_size, |
| 1090 | &nf_conntrack_vmalloc); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1091 | if (!nf_conntrack_hash) { |
| 1092 | printk(KERN_ERR "Unable to create nf_conntrack_hash\n"); |
| 1093 | goto err_out; |
| 1094 | } |
| 1095 | |
Patrick McHardy | f205c5e | 2007-07-07 22:28:14 -0700 | [diff] [blame] | 1096 | nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
Patrick McHardy | 8e5105a | 2007-07-07 22:27:33 -0700 | [diff] [blame] | 1097 | |
| 1098 | printk("nf_conntrack version %s (%u buckets, %d max)\n", |
| 1099 | NF_CONNTRACK_VERSION, nf_conntrack_htable_size, |
| 1100 | nf_conntrack_max); |
| 1101 | |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 1102 | nf_conntrack_cachep = kmem_cache_create("nf_conntrack", |
| 1103 | sizeof(struct nf_conn), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1104 | 0, 0, NULL); |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 1105 | if (!nf_conntrack_cachep) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1106 | printk(KERN_ERR "Unable to create nf_conn slab cache\n"); |
| 1107 | goto err_free_hash; |
| 1108 | } |
| 1109 | |
Patrick McHardy | ac5357e | 2007-03-14 16:38:25 -0700 | [diff] [blame] | 1110 | ret = nf_conntrack_proto_init(); |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 1111 | if (ret < 0) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 1112 | goto err_free_conntrack_slab; |
| 1113 | |
| 1114 | ret = nf_conntrack_expect_init(); |
| 1115 | if (ret < 0) |
| 1116 | goto out_fini_proto; |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 1117 | |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 1118 | ret = nf_conntrack_helper_init(); |
| 1119 | if (ret < 0) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 1120 | goto out_fini_expect; |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 1121 | |
Yasuyuki Kozakai | 7d3cdc6 | 2006-02-15 15:22:21 -0800 | [diff] [blame] | 1122 | /* For use by REJECT target */ |
Patrick McHardy | b334aad | 2008-01-14 23:48:57 -0800 | [diff] [blame] | 1123 | rcu_assign_pointer(ip_ct_attach, nf_conntrack_attach); |
Yasuyuki Kozakai | de6e05c | 2007-03-23 11:17:27 -0700 | [diff] [blame] | 1124 | rcu_assign_pointer(nf_ct_destroy, destroy_conntrack); |
Yasuyuki Kozakai | 7d3cdc6 | 2006-02-15 15:22:21 -0800 | [diff] [blame] | 1125 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1126 | /* Set up fake conntrack: |
| 1127 | - to never be deleted, not in any hashes */ |
| 1128 | atomic_set(&nf_conntrack_untracked.ct_general.use, 1); |
| 1129 | /* - and look it like as a confirmed connection */ |
| 1130 | set_bit(IPS_CONFIRMED_BIT, &nf_conntrack_untracked.status); |
| 1131 | |
| 1132 | return ret; |
| 1133 | |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 1134 | out_fini_expect: |
| 1135 | nf_conntrack_expect_fini(); |
Yasuyuki Kozakai | ceceae1 | 2007-07-07 22:23:42 -0700 | [diff] [blame] | 1136 | out_fini_proto: |
| 1137 | nf_conntrack_proto_fini(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1138 | err_free_conntrack_slab: |
Yasuyuki Kozakai | dacd2a1 | 2007-07-07 22:25:51 -0700 | [diff] [blame] | 1139 | kmem_cache_destroy(nf_conntrack_cachep); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1140 | err_free_hash: |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 1141 | nf_ct_free_hashtable(nf_conntrack_hash, nf_conntrack_vmalloc, |
| 1142 | nf_conntrack_htable_size); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1143 | err_out: |
| 1144 | return -ENOMEM; |
| 1145 | } |