Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 1 | /* Expectation handling for nf_conntrack. */ |
| 2 | |
| 3 | /* (C) 1999-2001 Paul `Rusty' Russell |
| 4 | * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> |
| 5 | * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/types.h> |
| 13 | #include <linux/netfilter.h> |
| 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/proc_fs.h> |
| 16 | #include <linux/seq_file.h> |
| 17 | #include <linux/stddef.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/err.h> |
| 20 | #include <linux/percpu.h> |
| 21 | #include <linux/kernel.h> |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 22 | #include <linux/jhash.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 23 | #include <net/net_namespace.h> |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 24 | |
| 25 | #include <net/netfilter/nf_conntrack.h> |
| 26 | #include <net/netfilter/nf_conntrack_core.h> |
| 27 | #include <net/netfilter/nf_conntrack_expect.h> |
| 28 | #include <net/netfilter/nf_conntrack_helper.h> |
| 29 | #include <net/netfilter/nf_conntrack_tuple.h> |
| 30 | |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 31 | unsigned int nf_ct_expect_hsize __read_mostly; |
| 32 | EXPORT_SYMBOL_GPL(nf_ct_expect_hsize); |
| 33 | |
| 34 | static unsigned int nf_ct_expect_hash_rnd __read_mostly; |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 35 | unsigned int nf_ct_expect_max __read_mostly; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 36 | static int nf_ct_expect_hash_rnd_initted __read_mostly; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 37 | |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 38 | static struct kmem_cache *nf_ct_expect_cachep __read_mostly; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 39 | |
| 40 | /* nf_conntrack_expect helper functions */ |
| 41 | void nf_ct_unlink_expect(struct nf_conntrack_expect *exp) |
| 42 | { |
| 43 | struct nf_conn_help *master_help = nfct_help(exp->master); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 44 | struct net *net = nf_ct_exp_net(exp); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 45 | |
| 46 | NF_CT_ASSERT(master_help); |
| 47 | NF_CT_ASSERT(!timer_pending(&exp->timeout)); |
| 48 | |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 49 | hlist_del_rcu(&exp->hnode); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 50 | net->ct.expect_count--; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 51 | |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 52 | hlist_del(&exp->lnode); |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 53 | master_help->expecting[exp->class]--; |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 54 | nf_ct_expect_put(exp); |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 55 | |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 56 | NF_CT_STAT_INC(net, expect_delete); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 57 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 58 | EXPORT_SYMBOL_GPL(nf_ct_unlink_expect); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 59 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 60 | static void nf_ct_expectation_timed_out(unsigned long ul_expect) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 61 | { |
| 62 | struct nf_conntrack_expect *exp = (void *)ul_expect; |
| 63 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 64 | spin_lock_bh(&nf_conntrack_lock); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 65 | nf_ct_unlink_expect(exp); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 66 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 67 | nf_ct_expect_put(exp); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 68 | } |
| 69 | |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 70 | static unsigned int nf_ct_expect_dst_hash(const struct nf_conntrack_tuple *tuple) |
| 71 | { |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 72 | unsigned int hash; |
| 73 | |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 74 | if (unlikely(!nf_ct_expect_hash_rnd_initted)) { |
Hagen Paul Pfeifer | af07d24 | 2009-02-20 10:48:06 +0100 | [diff] [blame] | 75 | get_random_bytes(&nf_ct_expect_hash_rnd, |
| 76 | sizeof(nf_ct_expect_hash_rnd)); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 77 | nf_ct_expect_hash_rnd_initted = 1; |
| 78 | } |
| 79 | |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 80 | hash = jhash2(tuple->dst.u3.all, ARRAY_SIZE(tuple->dst.u3.all), |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 81 | (((tuple->dst.protonum ^ tuple->src.l3num) << 16) | |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 82 | (__force __u16)tuple->dst.u.all) ^ nf_ct_expect_hash_rnd); |
| 83 | return ((u64)hash * nf_ct_expect_hsize) >> 32; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 84 | } |
| 85 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 86 | struct nf_conntrack_expect * |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 87 | __nf_ct_expect_find(struct net *net, const struct nf_conntrack_tuple *tuple) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 88 | { |
| 89 | struct nf_conntrack_expect *i; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 90 | struct hlist_node *n; |
| 91 | unsigned int h; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 92 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 93 | if (!net->ct.expect_count) |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 94 | return NULL; |
| 95 | |
| 96 | h = nf_ct_expect_dst_hash(tuple); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 97 | hlist_for_each_entry_rcu(i, n, &net->ct.expect_hash[h], hnode) { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 98 | if (nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask)) |
| 99 | return i; |
| 100 | } |
| 101 | return NULL; |
| 102 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 103 | EXPORT_SYMBOL_GPL(__nf_ct_expect_find); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 104 | |
| 105 | /* Just find a expectation corresponding to a tuple. */ |
| 106 | struct nf_conntrack_expect * |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 107 | nf_ct_expect_find_get(struct net *net, const struct nf_conntrack_tuple *tuple) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 108 | { |
| 109 | struct nf_conntrack_expect *i; |
| 110 | |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 111 | rcu_read_lock(); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 112 | i = __nf_ct_expect_find(net, tuple); |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 113 | if (i && !atomic_inc_not_zero(&i->use)) |
| 114 | i = NULL; |
| 115 | rcu_read_unlock(); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 116 | |
| 117 | return i; |
| 118 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 119 | EXPORT_SYMBOL_GPL(nf_ct_expect_find_get); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 120 | |
| 121 | /* If an expectation for this connection is found, it gets delete from |
| 122 | * global list then returned. */ |
| 123 | struct nf_conntrack_expect * |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 124 | nf_ct_find_expectation(struct net *net, const struct nf_conntrack_tuple *tuple) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 125 | { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 126 | struct nf_conntrack_expect *i, *exp = NULL; |
| 127 | struct hlist_node *n; |
| 128 | unsigned int h; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 129 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 130 | if (!net->ct.expect_count) |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 131 | return NULL; |
| 132 | |
| 133 | h = nf_ct_expect_dst_hash(tuple); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 134 | hlist_for_each_entry(i, n, &net->ct.expect_hash[h], hnode) { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 135 | if (!(i->flags & NF_CT_EXPECT_INACTIVE) && |
| 136 | nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask)) { |
| 137 | exp = i; |
| 138 | break; |
| 139 | } |
| 140 | } |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 141 | if (!exp) |
| 142 | return NULL; |
| 143 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 144 | /* If master is not in hash table yet (ie. packet hasn't left |
| 145 | this machine yet), how can other end know about expected? |
| 146 | Hence these are not the droids you are looking for (if |
| 147 | master ct never got confirmed, we'd hold a reference to it |
| 148 | and weird things would happen to future packets). */ |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 149 | if (!nf_ct_is_confirmed(exp->master)) |
| 150 | return NULL; |
| 151 | |
| 152 | if (exp->flags & NF_CT_EXPECT_PERMANENT) { |
| 153 | atomic_inc(&exp->use); |
| 154 | return exp; |
| 155 | } else if (del_timer(&exp->timeout)) { |
| 156 | nf_ct_unlink_expect(exp); |
| 157 | return exp; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 158 | } |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 159 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 160 | return NULL; |
| 161 | } |
| 162 | |
| 163 | /* delete all expectations for this conntrack */ |
| 164 | void nf_ct_remove_expectations(struct nf_conn *ct) |
| 165 | { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 166 | struct nf_conn_help *help = nfct_help(ct); |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 167 | struct nf_conntrack_expect *exp; |
| 168 | struct hlist_node *n, *next; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 169 | |
| 170 | /* Optimization: most connection never expect any others. */ |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 171 | if (!help) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 172 | return; |
| 173 | |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 174 | hlist_for_each_entry_safe(exp, n, next, &help->expectations, lnode) { |
| 175 | if (del_timer(&exp->timeout)) { |
| 176 | nf_ct_unlink_expect(exp); |
| 177 | nf_ct_expect_put(exp); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 178 | } |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 179 | } |
| 180 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 181 | EXPORT_SYMBOL_GPL(nf_ct_remove_expectations); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 182 | |
| 183 | /* Would two expected things clash? */ |
| 184 | static inline int expect_clash(const struct nf_conntrack_expect *a, |
| 185 | const struct nf_conntrack_expect *b) |
| 186 | { |
| 187 | /* Part covered by intersection of masks must be unequal, |
| 188 | otherwise they clash */ |
Patrick McHardy | d4156e8 | 2007-07-07 22:31:32 -0700 | [diff] [blame] | 189 | struct nf_conntrack_tuple_mask intersect_mask; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 190 | int count; |
| 191 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 192 | intersect_mask.src.u.all = a->mask.src.u.all & b->mask.src.u.all; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 193 | |
| 194 | for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){ |
| 195 | intersect_mask.src.u3.all[count] = |
| 196 | a->mask.src.u3.all[count] & b->mask.src.u3.all[count]; |
| 197 | } |
| 198 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 199 | return nf_ct_tuple_mask_cmp(&a->tuple, &b->tuple, &intersect_mask); |
| 200 | } |
| 201 | |
| 202 | static inline int expect_matches(const struct nf_conntrack_expect *a, |
| 203 | const struct nf_conntrack_expect *b) |
| 204 | { |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 205 | return a->master == b->master && a->class == b->class |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 206 | && nf_ct_tuple_equal(&a->tuple, &b->tuple) |
Patrick McHardy | d4156e8 | 2007-07-07 22:31:32 -0700 | [diff] [blame] | 207 | && nf_ct_tuple_mask_equal(&a->mask, &b->mask); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 208 | } |
| 209 | |
| 210 | /* Generally a bad idea to call this: could have matched already. */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 211 | void nf_ct_unexpect_related(struct nf_conntrack_expect *exp) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 212 | { |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 213 | spin_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | 4e1d4e6 | 2007-07-07 22:32:03 -0700 | [diff] [blame] | 214 | if (del_timer(&exp->timeout)) { |
| 215 | nf_ct_unlink_expect(exp); |
| 216 | nf_ct_expect_put(exp); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 217 | } |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 218 | spin_unlock_bh(&nf_conntrack_lock); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 219 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 220 | EXPORT_SYMBOL_GPL(nf_ct_unexpect_related); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 221 | |
| 222 | /* We don't increase the master conntrack refcount for non-fulfilled |
| 223 | * conntracks. During the conntrack destruction, the expectations are |
| 224 | * always killed before the conntrack itself */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 225 | struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 226 | { |
| 227 | struct nf_conntrack_expect *new; |
| 228 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 229 | new = kmem_cache_alloc(nf_ct_expect_cachep, GFP_ATOMIC); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 230 | if (!new) |
| 231 | return NULL; |
| 232 | |
| 233 | new->master = me; |
| 234 | atomic_set(&new->use, 1); |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 235 | INIT_RCU_HEAD(&new->rcu); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 236 | return new; |
| 237 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 238 | EXPORT_SYMBOL_GPL(nf_ct_expect_alloc); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 239 | |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 240 | void nf_ct_expect_init(struct nf_conntrack_expect *exp, unsigned int class, |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 241 | u_int8_t family, |
Patrick McHardy | 1d9d752 | 2008-03-25 20:07:58 -0700 | [diff] [blame] | 242 | const union nf_inet_addr *saddr, |
| 243 | const union nf_inet_addr *daddr, |
| 244 | u_int8_t proto, const __be16 *src, const __be16 *dst) |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 245 | { |
| 246 | int len; |
| 247 | |
| 248 | if (family == AF_INET) |
| 249 | len = 4; |
| 250 | else |
| 251 | len = 16; |
| 252 | |
| 253 | exp->flags = 0; |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 254 | exp->class = class; |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 255 | exp->expectfn = NULL; |
| 256 | exp->helper = NULL; |
| 257 | exp->tuple.src.l3num = family; |
| 258 | exp->tuple.dst.protonum = proto; |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 259 | |
| 260 | if (saddr) { |
| 261 | memcpy(&exp->tuple.src.u3, saddr, len); |
| 262 | if (sizeof(exp->tuple.src.u3) > len) |
| 263 | /* address needs to be cleared for nf_ct_tuple_equal */ |
| 264 | memset((void *)&exp->tuple.src.u3 + len, 0x00, |
| 265 | sizeof(exp->tuple.src.u3) - len); |
| 266 | memset(&exp->mask.src.u3, 0xFF, len); |
| 267 | if (sizeof(exp->mask.src.u3) > len) |
| 268 | memset((void *)&exp->mask.src.u3 + len, 0x00, |
| 269 | sizeof(exp->mask.src.u3) - len); |
| 270 | } else { |
| 271 | memset(&exp->tuple.src.u3, 0x00, sizeof(exp->tuple.src.u3)); |
| 272 | memset(&exp->mask.src.u3, 0x00, sizeof(exp->mask.src.u3)); |
| 273 | } |
| 274 | |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 275 | if (src) { |
Al Viro | a34c458 | 2007-07-26 17:33:19 +0100 | [diff] [blame] | 276 | exp->tuple.src.u.all = *src; |
| 277 | exp->mask.src.u.all = htons(0xFFFF); |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 278 | } else { |
| 279 | exp->tuple.src.u.all = 0; |
| 280 | exp->mask.src.u.all = 0; |
| 281 | } |
| 282 | |
Patrick McHardy | d4156e8 | 2007-07-07 22:31:32 -0700 | [diff] [blame] | 283 | memcpy(&exp->tuple.dst.u3, daddr, len); |
| 284 | if (sizeof(exp->tuple.dst.u3) > len) |
| 285 | /* address needs to be cleared for nf_ct_tuple_equal */ |
| 286 | memset((void *)&exp->tuple.dst.u3 + len, 0x00, |
| 287 | sizeof(exp->tuple.dst.u3) - len); |
| 288 | |
Al Viro | a34c458 | 2007-07-26 17:33:19 +0100 | [diff] [blame] | 289 | exp->tuple.dst.u.all = *dst; |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 290 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 291 | EXPORT_SYMBOL_GPL(nf_ct_expect_init); |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 292 | |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 293 | static void nf_ct_expect_free_rcu(struct rcu_head *head) |
| 294 | { |
| 295 | struct nf_conntrack_expect *exp; |
| 296 | |
| 297 | exp = container_of(head, struct nf_conntrack_expect, rcu); |
| 298 | kmem_cache_free(nf_ct_expect_cachep, exp); |
| 299 | } |
| 300 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 301 | void nf_ct_expect_put(struct nf_conntrack_expect *exp) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 302 | { |
| 303 | if (atomic_dec_and_test(&exp->use)) |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 304 | call_rcu(&exp->rcu, nf_ct_expect_free_rcu); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 305 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 306 | EXPORT_SYMBOL_GPL(nf_ct_expect_put); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 307 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 308 | static void nf_ct_expect_insert(struct nf_conntrack_expect *exp) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 309 | { |
| 310 | struct nf_conn_help *master_help = nfct_help(exp->master); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 311 | struct net *net = nf_ct_exp_net(exp); |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 312 | const struct nf_conntrack_expect_policy *p; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 313 | unsigned int h = nf_ct_expect_dst_hash(&exp->tuple); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 314 | |
| 315 | atomic_inc(&exp->use); |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 316 | |
| 317 | hlist_add_head(&exp->lnode, &master_help->expectations); |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 318 | master_help->expecting[exp->class]++; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 319 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 320 | hlist_add_head_rcu(&exp->hnode, &net->ct.expect_hash[h]); |
| 321 | net->ct.expect_count++; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 322 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 323 | setup_timer(&exp->timeout, nf_ct_expectation_timed_out, |
| 324 | (unsigned long)exp); |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 325 | p = &master_help->helper->expect_policy[exp->class]; |
| 326 | exp->timeout.expires = jiffies + p->timeout * HZ; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 327 | add_timer(&exp->timeout); |
| 328 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 329 | atomic_inc(&exp->use); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 330 | NF_CT_STAT_INC(net, expect_create); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 331 | } |
| 332 | |
| 333 | /* Race with expectations being used means we could have none to find; OK. */ |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 334 | static void evict_oldest_expect(struct nf_conn *master, |
| 335 | struct nf_conntrack_expect *new) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 336 | { |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 337 | struct nf_conn_help *master_help = nfct_help(master); |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 338 | struct nf_conntrack_expect *exp, *last = NULL; |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 339 | struct hlist_node *n; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 340 | |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 341 | hlist_for_each_entry(exp, n, &master_help->expectations, lnode) { |
| 342 | if (exp->class == new->class) |
| 343 | last = exp; |
| 344 | } |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 345 | |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 346 | if (last && del_timer(&last->timeout)) { |
| 347 | nf_ct_unlink_expect(last); |
| 348 | nf_ct_expect_put(last); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 349 | } |
| 350 | } |
| 351 | |
| 352 | static inline int refresh_timer(struct nf_conntrack_expect *i) |
| 353 | { |
| 354 | struct nf_conn_help *master_help = nfct_help(i->master); |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 355 | const struct nf_conntrack_expect_policy *p; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 356 | |
| 357 | if (!del_timer(&i->timeout)) |
| 358 | return 0; |
| 359 | |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 360 | p = &master_help->helper->expect_policy[i->class]; |
| 361 | i->timeout.expires = jiffies + p->timeout * HZ; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 362 | add_timer(&i->timeout); |
| 363 | return 1; |
| 364 | } |
| 365 | |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 366 | static inline int __nf_ct_expect_check(struct nf_conntrack_expect *expect) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 367 | { |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 368 | const struct nf_conntrack_expect_policy *p; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 369 | struct nf_conntrack_expect *i; |
| 370 | struct nf_conn *master = expect->master; |
| 371 | struct nf_conn_help *master_help = nfct_help(master); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 372 | struct net *net = nf_ct_exp_net(expect); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 373 | struct hlist_node *n; |
| 374 | unsigned int h; |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 375 | int ret = 1; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 376 | |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 377 | if (!master_help->helper) { |
| 378 | ret = -ESHUTDOWN; |
| 379 | goto out; |
| 380 | } |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 381 | h = nf_ct_expect_dst_hash(&expect->tuple); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 382 | hlist_for_each_entry(i, n, &net->ct.expect_hash[h], hnode) { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 383 | if (expect_matches(i, expect)) { |
| 384 | /* Refresh timer: if it's dying, ignore.. */ |
| 385 | if (refresh_timer(i)) { |
| 386 | ret = 0; |
| 387 | goto out; |
| 388 | } |
| 389 | } else if (expect_clash(i, expect)) { |
| 390 | ret = -EBUSY; |
| 391 | goto out; |
| 392 | } |
| 393 | } |
| 394 | /* Will be over limit? */ |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 395 | p = &master_help->helper->expect_policy[expect->class]; |
| 396 | if (p->max_expected && |
| 397 | master_help->expecting[expect->class] >= p->max_expected) { |
| 398 | evict_oldest_expect(master, expect); |
| 399 | if (master_help->expecting[expect->class] >= p->max_expected) { |
| 400 | ret = -EMFILE; |
| 401 | goto out; |
| 402 | } |
| 403 | } |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 404 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 405 | if (net->ct.expect_count >= nf_ct_expect_max) { |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 406 | if (net_ratelimit()) |
| 407 | printk(KERN_WARNING |
Alexey Dobriyan | 3d89e9c | 2008-03-10 16:43:10 -0700 | [diff] [blame] | 408 | "nf_conntrack: expectation table full\n"); |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 409 | ret = -EMFILE; |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 410 | } |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 411 | out: |
| 412 | return ret; |
| 413 | } |
| 414 | |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 415 | int nf_ct_expect_related_report(struct nf_conntrack_expect *expect, |
| 416 | u32 pid, int report) |
| 417 | { |
| 418 | int ret; |
| 419 | |
| 420 | spin_lock_bh(&nf_conntrack_lock); |
| 421 | ret = __nf_ct_expect_check(expect); |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 422 | if (ret <= 0) |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 423 | goto out; |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 424 | |
| 425 | ret = 0; |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 426 | nf_ct_expect_insert(expect); |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 427 | spin_unlock_bh(&nf_conntrack_lock); |
| 428 | nf_ct_expect_event_report(IPEXP_NEW, expect, pid, report); |
| 429 | return ret; |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 430 | out: |
| 431 | spin_unlock_bh(&nf_conntrack_lock); |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 432 | return ret; |
| 433 | } |
| 434 | EXPORT_SYMBOL_GPL(nf_ct_expect_related_report); |
| 435 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 436 | #ifdef CONFIG_PROC_FS |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 437 | struct ct_expect_iter_state { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 438 | struct seq_net_private p; |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 439 | unsigned int bucket; |
| 440 | }; |
| 441 | |
| 442 | static struct hlist_node *ct_expect_get_first(struct seq_file *seq) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 443 | { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 444 | struct net *net = seq_file_net(seq); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 445 | struct ct_expect_iter_state *st = seq->private; |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 446 | struct hlist_node *n; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 447 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 448 | for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) { |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 449 | n = rcu_dereference(net->ct.expect_hash[st->bucket].first); |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 450 | if (n) |
| 451 | return n; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 452 | } |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 453 | return NULL; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 454 | } |
| 455 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 456 | static struct hlist_node *ct_expect_get_next(struct seq_file *seq, |
| 457 | struct hlist_node *head) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 458 | { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 459 | struct net *net = seq_file_net(seq); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 460 | struct ct_expect_iter_state *st = seq->private; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 461 | |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 462 | head = rcu_dereference(head->next); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 463 | while (head == NULL) { |
| 464 | if (++st->bucket >= nf_ct_expect_hsize) |
| 465 | return NULL; |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 466 | head = rcu_dereference(net->ct.expect_hash[st->bucket].first); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 467 | } |
| 468 | return head; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 469 | } |
| 470 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 471 | static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos) |
| 472 | { |
| 473 | struct hlist_node *head = ct_expect_get_first(seq); |
| 474 | |
| 475 | if (head) |
| 476 | while (pos && (head = ct_expect_get_next(seq, head))) |
| 477 | pos--; |
| 478 | return pos ? NULL : head; |
| 479 | } |
| 480 | |
| 481 | static void *exp_seq_start(struct seq_file *seq, loff_t *pos) |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 482 | __acquires(RCU) |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 483 | { |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 484 | rcu_read_lock(); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 485 | return ct_expect_get_idx(seq, *pos); |
| 486 | } |
| 487 | |
| 488 | static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 489 | { |
| 490 | (*pos)++; |
| 491 | return ct_expect_get_next(seq, v); |
| 492 | } |
| 493 | |
| 494 | static void exp_seq_stop(struct seq_file *seq, void *v) |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 495 | __releases(RCU) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 496 | { |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 497 | rcu_read_unlock(); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 498 | } |
| 499 | |
| 500 | static int exp_seq_show(struct seq_file *s, void *v) |
| 501 | { |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 502 | struct nf_conntrack_expect *expect; |
| 503 | struct hlist_node *n = v; |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 504 | char *delim = ""; |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 505 | |
| 506 | expect = hlist_entry(n, struct nf_conntrack_expect, hnode); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 507 | |
| 508 | if (expect->timeout.function) |
| 509 | seq_printf(s, "%ld ", timer_pending(&expect->timeout) |
| 510 | ? (long)(expect->timeout.expires - jiffies)/HZ : 0); |
| 511 | else |
| 512 | seq_printf(s, "- "); |
| 513 | seq_printf(s, "l3proto = %u proto=%u ", |
| 514 | expect->tuple.src.l3num, |
| 515 | expect->tuple.dst.protonum); |
| 516 | print_tuple(s, &expect->tuple, |
| 517 | __nf_ct_l3proto_find(expect->tuple.src.l3num), |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 518 | __nf_ct_l4proto_find(expect->tuple.src.l3num, |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 519 | expect->tuple.dst.protonum)); |
Patrick McHardy | 4bb119e | 2008-03-25 20:08:17 -0700 | [diff] [blame] | 520 | |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 521 | if (expect->flags & NF_CT_EXPECT_PERMANENT) { |
| 522 | seq_printf(s, "PERMANENT"); |
| 523 | delim = ","; |
| 524 | } |
| 525 | if (expect->flags & NF_CT_EXPECT_INACTIVE) |
| 526 | seq_printf(s, "%sINACTIVE", delim); |
Patrick McHardy | 4bb119e | 2008-03-25 20:08:17 -0700 | [diff] [blame] | 527 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 528 | return seq_putc(s, '\n'); |
| 529 | } |
| 530 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 531 | static const struct seq_operations exp_seq_ops = { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 532 | .start = exp_seq_start, |
| 533 | .next = exp_seq_next, |
| 534 | .stop = exp_seq_stop, |
| 535 | .show = exp_seq_show |
| 536 | }; |
| 537 | |
| 538 | static int exp_open(struct inode *inode, struct file *file) |
| 539 | { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 540 | return seq_open_net(inode, file, &exp_seq_ops, |
Pavel Emelyanov | e2da591 | 2007-10-10 02:29:58 -0700 | [diff] [blame] | 541 | sizeof(struct ct_expect_iter_state)); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 542 | } |
| 543 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 544 | static const struct file_operations exp_file_ops = { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 545 | .owner = THIS_MODULE, |
| 546 | .open = exp_open, |
| 547 | .read = seq_read, |
| 548 | .llseek = seq_lseek, |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 549 | .release = seq_release_net, |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 550 | }; |
| 551 | #endif /* CONFIG_PROC_FS */ |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 552 | |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 553 | static int exp_proc_init(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 554 | { |
| 555 | #ifdef CONFIG_PROC_FS |
| 556 | struct proc_dir_entry *proc; |
| 557 | |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 558 | proc = proc_net_fops_create(net, "nf_conntrack_expect", 0440, &exp_file_ops); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 559 | if (!proc) |
| 560 | return -ENOMEM; |
| 561 | #endif /* CONFIG_PROC_FS */ |
| 562 | return 0; |
| 563 | } |
| 564 | |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 565 | static void exp_proc_remove(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 566 | { |
| 567 | #ifdef CONFIG_PROC_FS |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 568 | proc_net_remove(net, "nf_conntrack_expect"); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 569 | #endif /* CONFIG_PROC_FS */ |
| 570 | } |
| 571 | |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 572 | module_param_named(expect_hashsize, nf_ct_expect_hsize, uint, 0600); |
| 573 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 574 | int nf_conntrack_expect_init(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 575 | { |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 576 | int err = -ENOMEM; |
| 577 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 578 | if (net_eq(net, &init_net)) { |
| 579 | if (!nf_ct_expect_hsize) { |
| 580 | nf_ct_expect_hsize = nf_conntrack_htable_size / 256; |
| 581 | if (!nf_ct_expect_hsize) |
| 582 | nf_ct_expect_hsize = 1; |
| 583 | } |
| 584 | nf_ct_expect_max = nf_ct_expect_hsize * 4; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 585 | } |
| 586 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 587 | net->ct.expect_count = 0; |
| 588 | net->ct.expect_hash = nf_ct_alloc_hashtable(&nf_ct_expect_hsize, |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 589 | &net->ct.expect_vmalloc, 0); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 590 | if (net->ct.expect_hash == NULL) |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 591 | goto err1; |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 592 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 593 | if (net_eq(net, &init_net)) { |
| 594 | nf_ct_expect_cachep = kmem_cache_create("nf_conntrack_expect", |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 595 | sizeof(struct nf_conntrack_expect), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 596 | 0, 0, NULL); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 597 | if (!nf_ct_expect_cachep) |
| 598 | goto err2; |
| 599 | } |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 600 | |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 601 | err = exp_proc_init(net); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 602 | if (err < 0) |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 603 | goto err3; |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 604 | |
| 605 | return 0; |
| 606 | |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 607 | err3: |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 608 | if (net_eq(net, &init_net)) |
| 609 | kmem_cache_destroy(nf_ct_expect_cachep); |
Alexey Dobriyan | 12293bf | 2008-05-29 03:19:37 -0700 | [diff] [blame] | 610 | err2: |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 611 | nf_ct_free_hashtable(net->ct.expect_hash, net->ct.expect_vmalloc, |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 612 | nf_ct_expect_hsize); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 613 | err1: |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 614 | return err; |
| 615 | } |
| 616 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 617 | void nf_conntrack_expect_fini(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 618 | { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 619 | exp_proc_remove(net); |
Jesper Dangaard Brouer | 308ff82 | 2009-06-25 16:32:52 +0200 | [diff] [blame] | 620 | if (net_eq(net, &init_net)) { |
| 621 | rcu_barrier(); /* Wait for call_rcu() before destroy */ |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 622 | kmem_cache_destroy(nf_ct_expect_cachep); |
Jesper Dangaard Brouer | 308ff82 | 2009-06-25 16:32:52 +0200 | [diff] [blame] | 623 | } |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 624 | nf_ct_free_hashtable(net->ct.expect_hash, net->ct.expect_vmalloc, |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 625 | nf_ct_expect_hsize); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 626 | } |