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> |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 30 | #include <net/netfilter/nf_conntrack_zones.h> |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 31 | |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 32 | unsigned int nf_ct_expect_hsize __read_mostly; |
| 33 | EXPORT_SYMBOL_GPL(nf_ct_expect_hsize); |
| 34 | |
| 35 | static unsigned int nf_ct_expect_hash_rnd __read_mostly; |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 36 | unsigned int nf_ct_expect_max __read_mostly; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 37 | static int nf_ct_expect_hash_rnd_initted __read_mostly; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 38 | |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 39 | static struct kmem_cache *nf_ct_expect_cachep __read_mostly; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 40 | |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 41 | static HLIST_HEAD(nf_ct_userspace_expect_list); |
| 42 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 43 | /* nf_conntrack_expect helper functions */ |
Pablo Neira Ayuso | ebbf41d | 2010-10-19 10:19:06 +0200 | [diff] [blame] | 44 | void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp, |
| 45 | u32 pid, int report) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 46 | { |
| 47 | struct nf_conn_help *master_help = nfct_help(exp->master); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 48 | struct net *net = nf_ct_exp_net(exp); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 49 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 50 | NF_CT_ASSERT(!timer_pending(&exp->timeout)); |
| 51 | |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 52 | hlist_del_rcu(&exp->hnode); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 53 | net->ct.expect_count--; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 54 | |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 55 | hlist_del(&exp->lnode); |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 56 | if (!(exp->flags & NF_CT_EXPECT_USERSPACE)) |
| 57 | master_help->expecting[exp->class]--; |
| 58 | |
Pablo Neira Ayuso | ebbf41d | 2010-10-19 10:19:06 +0200 | [diff] [blame] | 59 | nf_ct_expect_event_report(IPEXP_DESTROY, exp, pid, report); |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 60 | nf_ct_expect_put(exp); |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 61 | |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 62 | NF_CT_STAT_INC(net, expect_delete); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 63 | } |
Pablo Neira Ayuso | ebbf41d | 2010-10-19 10:19:06 +0200 | [diff] [blame] | 64 | EXPORT_SYMBOL_GPL(nf_ct_unlink_expect_report); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 65 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 66 | static void nf_ct_expectation_timed_out(unsigned long ul_expect) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 67 | { |
| 68 | struct nf_conntrack_expect *exp = (void *)ul_expect; |
| 69 | |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 70 | spin_lock_bh(&nf_conntrack_lock); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 71 | nf_ct_unlink_expect(exp); |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 72 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 73 | nf_ct_expect_put(exp); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 74 | } |
| 75 | |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 76 | static unsigned int nf_ct_expect_dst_hash(const struct nf_conntrack_tuple *tuple) |
| 77 | { |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 78 | unsigned int hash; |
| 79 | |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 80 | if (unlikely(!nf_ct_expect_hash_rnd_initted)) { |
Hagen Paul Pfeifer | af07d24 | 2009-02-20 10:48:06 +0100 | [diff] [blame] | 81 | get_random_bytes(&nf_ct_expect_hash_rnd, |
| 82 | sizeof(nf_ct_expect_hash_rnd)); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 83 | nf_ct_expect_hash_rnd_initted = 1; |
| 84 | } |
| 85 | |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 86 | hash = jhash2(tuple->dst.u3.all, ARRAY_SIZE(tuple->dst.u3.all), |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 87 | (((tuple->dst.protonum ^ tuple->src.l3num) << 16) | |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 88 | (__force __u16)tuple->dst.u.all) ^ nf_ct_expect_hash_rnd); |
| 89 | return ((u64)hash * nf_ct_expect_hsize) >> 32; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 90 | } |
| 91 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 92 | struct nf_conntrack_expect * |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 93 | __nf_ct_expect_find(struct net *net, u16 zone, |
| 94 | const struct nf_conntrack_tuple *tuple) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 95 | { |
| 96 | struct nf_conntrack_expect *i; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 97 | struct hlist_node *n; |
| 98 | unsigned int h; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 99 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 100 | if (!net->ct.expect_count) |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 101 | return NULL; |
| 102 | |
| 103 | h = nf_ct_expect_dst_hash(tuple); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 104 | hlist_for_each_entry_rcu(i, n, &net->ct.expect_hash[h], hnode) { |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 105 | if (nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask) && |
| 106 | nf_ct_zone(i->master) == zone) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 107 | return i; |
| 108 | } |
| 109 | return NULL; |
| 110 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 111 | EXPORT_SYMBOL_GPL(__nf_ct_expect_find); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 112 | |
| 113 | /* Just find a expectation corresponding to a tuple. */ |
| 114 | struct nf_conntrack_expect * |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 115 | nf_ct_expect_find_get(struct net *net, u16 zone, |
| 116 | const struct nf_conntrack_tuple *tuple) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 117 | { |
| 118 | struct nf_conntrack_expect *i; |
| 119 | |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 120 | rcu_read_lock(); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 121 | i = __nf_ct_expect_find(net, zone, tuple); |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 122 | if (i && !atomic_inc_not_zero(&i->use)) |
| 123 | i = NULL; |
| 124 | rcu_read_unlock(); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 125 | |
| 126 | return i; |
| 127 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 128 | EXPORT_SYMBOL_GPL(nf_ct_expect_find_get); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 129 | |
| 130 | /* If an expectation for this connection is found, it gets delete from |
| 131 | * global list then returned. */ |
| 132 | struct nf_conntrack_expect * |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 133 | nf_ct_find_expectation(struct net *net, u16 zone, |
| 134 | const struct nf_conntrack_tuple *tuple) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 135 | { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 136 | struct nf_conntrack_expect *i, *exp = NULL; |
| 137 | struct hlist_node *n; |
| 138 | unsigned int h; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 139 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 140 | if (!net->ct.expect_count) |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 141 | return NULL; |
| 142 | |
| 143 | h = nf_ct_expect_dst_hash(tuple); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 144 | hlist_for_each_entry(i, n, &net->ct.expect_hash[h], hnode) { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 145 | if (!(i->flags & NF_CT_EXPECT_INACTIVE) && |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 146 | nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask) && |
| 147 | nf_ct_zone(i->master) == zone) { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 148 | exp = i; |
| 149 | break; |
| 150 | } |
| 151 | } |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 152 | if (!exp) |
| 153 | return NULL; |
| 154 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 155 | /* If master is not in hash table yet (ie. packet hasn't left |
| 156 | this machine yet), how can other end know about expected? |
| 157 | Hence these are not the droids you are looking for (if |
| 158 | master ct never got confirmed, we'd hold a reference to it |
| 159 | and weird things would happen to future packets). */ |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 160 | if (!nf_ct_is_confirmed(exp->master)) |
| 161 | return NULL; |
| 162 | |
| 163 | if (exp->flags & NF_CT_EXPECT_PERMANENT) { |
| 164 | atomic_inc(&exp->use); |
| 165 | return exp; |
| 166 | } else if (del_timer(&exp->timeout)) { |
| 167 | nf_ct_unlink_expect(exp); |
| 168 | return exp; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 169 | } |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 170 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 171 | return NULL; |
| 172 | } |
| 173 | |
| 174 | /* delete all expectations for this conntrack */ |
| 175 | void nf_ct_remove_expectations(struct nf_conn *ct) |
| 176 | { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 177 | struct nf_conn_help *help = nfct_help(ct); |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 178 | struct nf_conntrack_expect *exp; |
| 179 | struct hlist_node *n, *next; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 180 | |
| 181 | /* Optimization: most connection never expect any others. */ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 182 | if (!help) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 183 | return; |
| 184 | |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 185 | hlist_for_each_entry_safe(exp, n, next, &help->expectations, lnode) { |
| 186 | if (del_timer(&exp->timeout)) { |
| 187 | nf_ct_unlink_expect(exp); |
| 188 | nf_ct_expect_put(exp); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 189 | } |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 190 | } |
| 191 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 192 | EXPORT_SYMBOL_GPL(nf_ct_remove_expectations); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 193 | |
| 194 | /* Would two expected things clash? */ |
| 195 | static inline int expect_clash(const struct nf_conntrack_expect *a, |
| 196 | const struct nf_conntrack_expect *b) |
| 197 | { |
| 198 | /* Part covered by intersection of masks must be unequal, |
| 199 | otherwise they clash */ |
Patrick McHardy | d4156e8 | 2007-07-07 22:31:32 -0700 | [diff] [blame] | 200 | struct nf_conntrack_tuple_mask intersect_mask; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 201 | int count; |
| 202 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 203 | 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] | 204 | |
| 205 | for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){ |
| 206 | intersect_mask.src.u3.all[count] = |
| 207 | a->mask.src.u3.all[count] & b->mask.src.u3.all[count]; |
| 208 | } |
| 209 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 210 | return nf_ct_tuple_mask_cmp(&a->tuple, &b->tuple, &intersect_mask); |
| 211 | } |
| 212 | |
| 213 | static inline int expect_matches(const struct nf_conntrack_expect *a, |
| 214 | const struct nf_conntrack_expect *b) |
| 215 | { |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 216 | return a->master == b->master && a->class == b->class && |
| 217 | nf_ct_tuple_equal(&a->tuple, &b->tuple) && |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 218 | nf_ct_tuple_mask_equal(&a->mask, &b->mask) && |
| 219 | nf_ct_zone(a->master) == nf_ct_zone(b->master); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 220 | } |
| 221 | |
| 222 | /* Generally a bad idea to call this: could have matched already. */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 223 | void nf_ct_unexpect_related(struct nf_conntrack_expect *exp) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 224 | { |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 225 | spin_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | 4e1d4e6 | 2007-07-07 22:32:03 -0700 | [diff] [blame] | 226 | if (del_timer(&exp->timeout)) { |
| 227 | nf_ct_unlink_expect(exp); |
| 228 | nf_ct_expect_put(exp); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 229 | } |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 230 | spin_unlock_bh(&nf_conntrack_lock); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 231 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 232 | EXPORT_SYMBOL_GPL(nf_ct_unexpect_related); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 233 | |
| 234 | /* We don't increase the master conntrack refcount for non-fulfilled |
| 235 | * conntracks. During the conntrack destruction, the expectations are |
| 236 | * always killed before the conntrack itself */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 237 | struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 238 | { |
| 239 | struct nf_conntrack_expect *new; |
| 240 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 241 | new = kmem_cache_alloc(nf_ct_expect_cachep, GFP_ATOMIC); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 242 | if (!new) |
| 243 | return NULL; |
| 244 | |
| 245 | new->master = me; |
| 246 | atomic_set(&new->use, 1); |
| 247 | return new; |
| 248 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 249 | EXPORT_SYMBOL_GPL(nf_ct_expect_alloc); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 250 | |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 251 | 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] | 252 | u_int8_t family, |
Patrick McHardy | 1d9d752 | 2008-03-25 20:07:58 -0700 | [diff] [blame] | 253 | const union nf_inet_addr *saddr, |
| 254 | const union nf_inet_addr *daddr, |
| 255 | u_int8_t proto, const __be16 *src, const __be16 *dst) |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 256 | { |
| 257 | int len; |
| 258 | |
| 259 | if (family == AF_INET) |
| 260 | len = 4; |
| 261 | else |
| 262 | len = 16; |
| 263 | |
| 264 | exp->flags = 0; |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 265 | exp->class = class; |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 266 | exp->expectfn = NULL; |
| 267 | exp->helper = NULL; |
| 268 | exp->tuple.src.l3num = family; |
| 269 | exp->tuple.dst.protonum = proto; |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 270 | |
| 271 | if (saddr) { |
| 272 | memcpy(&exp->tuple.src.u3, saddr, len); |
| 273 | if (sizeof(exp->tuple.src.u3) > len) |
| 274 | /* address needs to be cleared for nf_ct_tuple_equal */ |
| 275 | memset((void *)&exp->tuple.src.u3 + len, 0x00, |
| 276 | sizeof(exp->tuple.src.u3) - len); |
| 277 | memset(&exp->mask.src.u3, 0xFF, len); |
| 278 | if (sizeof(exp->mask.src.u3) > len) |
| 279 | memset((void *)&exp->mask.src.u3 + len, 0x00, |
| 280 | sizeof(exp->mask.src.u3) - len); |
| 281 | } else { |
| 282 | memset(&exp->tuple.src.u3, 0x00, sizeof(exp->tuple.src.u3)); |
| 283 | memset(&exp->mask.src.u3, 0x00, sizeof(exp->mask.src.u3)); |
| 284 | } |
| 285 | |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 286 | if (src) { |
Al Viro | a34c458 | 2007-07-26 17:33:19 +0100 | [diff] [blame] | 287 | exp->tuple.src.u.all = *src; |
| 288 | exp->mask.src.u.all = htons(0xFFFF); |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 289 | } else { |
| 290 | exp->tuple.src.u.all = 0; |
| 291 | exp->mask.src.u.all = 0; |
| 292 | } |
| 293 | |
Patrick McHardy | d4156e8 | 2007-07-07 22:31:32 -0700 | [diff] [blame] | 294 | memcpy(&exp->tuple.dst.u3, daddr, len); |
| 295 | if (sizeof(exp->tuple.dst.u3) > len) |
| 296 | /* address needs to be cleared for nf_ct_tuple_equal */ |
| 297 | memset((void *)&exp->tuple.dst.u3 + len, 0x00, |
| 298 | sizeof(exp->tuple.dst.u3) - len); |
| 299 | |
Al Viro | a34c458 | 2007-07-26 17:33:19 +0100 | [diff] [blame] | 300 | exp->tuple.dst.u.all = *dst; |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 301 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 302 | EXPORT_SYMBOL_GPL(nf_ct_expect_init); |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 303 | |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 304 | static void nf_ct_expect_free_rcu(struct rcu_head *head) |
| 305 | { |
| 306 | struct nf_conntrack_expect *exp; |
| 307 | |
| 308 | exp = container_of(head, struct nf_conntrack_expect, rcu); |
| 309 | kmem_cache_free(nf_ct_expect_cachep, exp); |
| 310 | } |
| 311 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 312 | void nf_ct_expect_put(struct nf_conntrack_expect *exp) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 313 | { |
| 314 | if (atomic_dec_and_test(&exp->use)) |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 315 | call_rcu(&exp->rcu, nf_ct_expect_free_rcu); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 316 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 317 | EXPORT_SYMBOL_GPL(nf_ct_expect_put); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 318 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 319 | static void nf_ct_expect_insert(struct nf_conntrack_expect *exp) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 320 | { |
| 321 | struct nf_conn_help *master_help = nfct_help(exp->master); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 322 | struct net *net = nf_ct_exp_net(exp); |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 323 | const struct nf_conntrack_expect_policy *p; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 324 | unsigned int h = nf_ct_expect_dst_hash(&exp->tuple); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 325 | |
| 326 | atomic_inc(&exp->use); |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 327 | |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 328 | if (master_help) { |
| 329 | hlist_add_head(&exp->lnode, &master_help->expectations); |
| 330 | master_help->expecting[exp->class]++; |
| 331 | } else if (exp->flags & NF_CT_EXPECT_USERSPACE) |
| 332 | hlist_add_head(&exp->lnode, &nf_ct_userspace_expect_list); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 333 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 334 | hlist_add_head_rcu(&exp->hnode, &net->ct.expect_hash[h]); |
| 335 | net->ct.expect_count++; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 336 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 337 | setup_timer(&exp->timeout, nf_ct_expectation_timed_out, |
| 338 | (unsigned long)exp); |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 339 | if (master_help) { |
Eric Dumazet | c5d277d | 2010-11-15 19:45:13 +0100 | [diff] [blame^] | 340 | p = &rcu_dereference_protected( |
| 341 | master_help->helper, |
| 342 | lockdep_is_held(&nf_conntrack_lock) |
| 343 | )->expect_policy[exp->class]; |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 344 | exp->timeout.expires = jiffies + p->timeout * HZ; |
| 345 | } |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 346 | add_timer(&exp->timeout); |
| 347 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 348 | atomic_inc(&exp->use); |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 349 | NF_CT_STAT_INC(net, expect_create); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 350 | } |
| 351 | |
| 352 | /* Race with expectations being used means we could have none to find; OK. */ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 353 | static void evict_oldest_expect(struct nf_conn *master, |
| 354 | struct nf_conntrack_expect *new) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 355 | { |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 356 | struct nf_conn_help *master_help = nfct_help(master); |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 357 | struct nf_conntrack_expect *exp, *last = NULL; |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 358 | struct hlist_node *n; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 359 | |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 360 | hlist_for_each_entry(exp, n, &master_help->expectations, lnode) { |
| 361 | if (exp->class == new->class) |
| 362 | last = exp; |
| 363 | } |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 364 | |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 365 | if (last && del_timer(&last->timeout)) { |
| 366 | nf_ct_unlink_expect(last); |
| 367 | nf_ct_expect_put(last); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 368 | } |
| 369 | } |
| 370 | |
| 371 | static inline int refresh_timer(struct nf_conntrack_expect *i) |
| 372 | { |
| 373 | struct nf_conn_help *master_help = nfct_help(i->master); |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 374 | const struct nf_conntrack_expect_policy *p; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 375 | |
| 376 | if (!del_timer(&i->timeout)) |
| 377 | return 0; |
| 378 | |
Eric Dumazet | c5d277d | 2010-11-15 19:45:13 +0100 | [diff] [blame^] | 379 | p = &rcu_dereference_protected( |
| 380 | master_help->helper, |
| 381 | lockdep_is_held(&nf_conntrack_lock) |
| 382 | )->expect_policy[i->class]; |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 383 | i->timeout.expires = jiffies + p->timeout * HZ; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 384 | add_timer(&i->timeout); |
| 385 | return 1; |
| 386 | } |
| 387 | |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 388 | static inline int __nf_ct_expect_check(struct nf_conntrack_expect *expect) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 389 | { |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 390 | const struct nf_conntrack_expect_policy *p; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 391 | struct nf_conntrack_expect *i; |
| 392 | struct nf_conn *master = expect->master; |
| 393 | struct nf_conn_help *master_help = nfct_help(master); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 394 | struct net *net = nf_ct_exp_net(expect); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 395 | struct hlist_node *n; |
| 396 | unsigned int h; |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 397 | int ret = 1; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 398 | |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 399 | /* Don't allow expectations created from kernel-space with no helper */ |
| 400 | if (!(expect->flags & NF_CT_EXPECT_USERSPACE) && |
| 401 | (!master_help || (master_help && !master_help->helper))) { |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 402 | ret = -ESHUTDOWN; |
| 403 | goto out; |
| 404 | } |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 405 | h = nf_ct_expect_dst_hash(&expect->tuple); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 406 | hlist_for_each_entry(i, n, &net->ct.expect_hash[h], hnode) { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 407 | if (expect_matches(i, expect)) { |
| 408 | /* Refresh timer: if it's dying, ignore.. */ |
| 409 | if (refresh_timer(i)) { |
| 410 | ret = 0; |
| 411 | goto out; |
| 412 | } |
| 413 | } else if (expect_clash(i, expect)) { |
| 414 | ret = -EBUSY; |
| 415 | goto out; |
| 416 | } |
| 417 | } |
| 418 | /* Will be over limit? */ |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 419 | if (master_help) { |
Eric Dumazet | c5d277d | 2010-11-15 19:45:13 +0100 | [diff] [blame^] | 420 | p = &rcu_dereference_protected( |
| 421 | master_help->helper, |
| 422 | lockdep_is_held(&nf_conntrack_lock) |
| 423 | )->expect_policy[expect->class]; |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 424 | if (p->max_expected && |
| 425 | master_help->expecting[expect->class] >= p->max_expected) { |
| 426 | evict_oldest_expect(master, expect); |
| 427 | if (master_help->expecting[expect->class] |
| 428 | >= p->max_expected) { |
| 429 | ret = -EMFILE; |
| 430 | goto out; |
| 431 | } |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 432 | } |
| 433 | } |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 434 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 435 | if (net->ct.expect_count >= nf_ct_expect_max) { |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 436 | if (net_ratelimit()) |
| 437 | printk(KERN_WARNING |
Alexey Dobriyan | 3d89e9c | 2008-03-10 16:43:10 -0700 | [diff] [blame] | 438 | "nf_conntrack: expectation table full\n"); |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 439 | ret = -EMFILE; |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 440 | } |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 441 | out: |
| 442 | return ret; |
| 443 | } |
| 444 | |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 445 | int nf_ct_expect_related_report(struct nf_conntrack_expect *expect, |
| 446 | u32 pid, int report) |
| 447 | { |
| 448 | int ret; |
| 449 | |
| 450 | spin_lock_bh(&nf_conntrack_lock); |
| 451 | ret = __nf_ct_expect_check(expect); |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 452 | if (ret <= 0) |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 453 | goto out; |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 454 | |
| 455 | ret = 0; |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 456 | nf_ct_expect_insert(expect); |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 457 | spin_unlock_bh(&nf_conntrack_lock); |
| 458 | nf_ct_expect_event_report(IPEXP_NEW, expect, pid, report); |
| 459 | return ret; |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 460 | out: |
| 461 | spin_unlock_bh(&nf_conntrack_lock); |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 462 | return ret; |
| 463 | } |
| 464 | EXPORT_SYMBOL_GPL(nf_ct_expect_related_report); |
| 465 | |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 466 | void nf_ct_remove_userspace_expectations(void) |
| 467 | { |
| 468 | struct nf_conntrack_expect *exp; |
| 469 | struct hlist_node *n, *next; |
| 470 | |
| 471 | hlist_for_each_entry_safe(exp, n, next, |
| 472 | &nf_ct_userspace_expect_list, lnode) { |
| 473 | if (del_timer(&exp->timeout)) { |
| 474 | nf_ct_unlink_expect(exp); |
| 475 | nf_ct_expect_put(exp); |
| 476 | } |
| 477 | } |
| 478 | } |
| 479 | EXPORT_SYMBOL_GPL(nf_ct_remove_userspace_expectations); |
| 480 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 481 | #ifdef CONFIG_PROC_FS |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 482 | struct ct_expect_iter_state { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 483 | struct seq_net_private p; |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 484 | unsigned int bucket; |
| 485 | }; |
| 486 | |
| 487 | static struct hlist_node *ct_expect_get_first(struct seq_file *seq) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 488 | { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 489 | struct net *net = seq_file_net(seq); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 490 | struct ct_expect_iter_state *st = seq->private; |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 491 | struct hlist_node *n; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 492 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 493 | for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) { |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 494 | n = rcu_dereference(hlist_first_rcu(&net->ct.expect_hash[st->bucket])); |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 495 | if (n) |
| 496 | return n; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 497 | } |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 498 | return NULL; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 499 | } |
| 500 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 501 | static struct hlist_node *ct_expect_get_next(struct seq_file *seq, |
| 502 | struct hlist_node *head) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 503 | { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 504 | struct net *net = seq_file_net(seq); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 505 | struct ct_expect_iter_state *st = seq->private; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 506 | |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 507 | head = rcu_dereference(hlist_next_rcu(head)); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 508 | while (head == NULL) { |
| 509 | if (++st->bucket >= nf_ct_expect_hsize) |
| 510 | return NULL; |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 511 | head = rcu_dereference(hlist_first_rcu(&net->ct.expect_hash[st->bucket])); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 512 | } |
| 513 | return head; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 514 | } |
| 515 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 516 | static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos) |
| 517 | { |
| 518 | struct hlist_node *head = ct_expect_get_first(seq); |
| 519 | |
| 520 | if (head) |
| 521 | while (pos && (head = ct_expect_get_next(seq, head))) |
| 522 | pos--; |
| 523 | return pos ? NULL : head; |
| 524 | } |
| 525 | |
| 526 | static void *exp_seq_start(struct seq_file *seq, loff_t *pos) |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 527 | __acquires(RCU) |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 528 | { |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 529 | rcu_read_lock(); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 530 | return ct_expect_get_idx(seq, *pos); |
| 531 | } |
| 532 | |
| 533 | static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 534 | { |
| 535 | (*pos)++; |
| 536 | return ct_expect_get_next(seq, v); |
| 537 | } |
| 538 | |
| 539 | static void exp_seq_stop(struct seq_file *seq, void *v) |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 540 | __releases(RCU) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 541 | { |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 542 | rcu_read_unlock(); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 543 | } |
| 544 | |
| 545 | static int exp_seq_show(struct seq_file *s, void *v) |
| 546 | { |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 547 | struct nf_conntrack_expect *expect; |
Patrick McHardy | b87921b | 2010-02-11 12:22:48 +0100 | [diff] [blame] | 548 | struct nf_conntrack_helper *helper; |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 549 | struct hlist_node *n = v; |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 550 | char *delim = ""; |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 551 | |
| 552 | expect = hlist_entry(n, struct nf_conntrack_expect, hnode); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 553 | |
| 554 | if (expect->timeout.function) |
| 555 | seq_printf(s, "%ld ", timer_pending(&expect->timeout) |
| 556 | ? (long)(expect->timeout.expires - jiffies)/HZ : 0); |
| 557 | else |
| 558 | seq_printf(s, "- "); |
| 559 | seq_printf(s, "l3proto = %u proto=%u ", |
| 560 | expect->tuple.src.l3num, |
| 561 | expect->tuple.dst.protonum); |
| 562 | print_tuple(s, &expect->tuple, |
| 563 | __nf_ct_l3proto_find(expect->tuple.src.l3num), |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 564 | __nf_ct_l4proto_find(expect->tuple.src.l3num, |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 565 | expect->tuple.dst.protonum)); |
Patrick McHardy | 4bb119e | 2008-03-25 20:08:17 -0700 | [diff] [blame] | 566 | |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 567 | if (expect->flags & NF_CT_EXPECT_PERMANENT) { |
| 568 | seq_printf(s, "PERMANENT"); |
| 569 | delim = ","; |
| 570 | } |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 571 | if (expect->flags & NF_CT_EXPECT_INACTIVE) { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 572 | seq_printf(s, "%sINACTIVE", delim); |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 573 | delim = ","; |
| 574 | } |
| 575 | if (expect->flags & NF_CT_EXPECT_USERSPACE) |
| 576 | seq_printf(s, "%sUSERSPACE", delim); |
Patrick McHardy | 4bb119e | 2008-03-25 20:08:17 -0700 | [diff] [blame] | 577 | |
Patrick McHardy | b87921b | 2010-02-11 12:22:48 +0100 | [diff] [blame] | 578 | helper = rcu_dereference(nfct_help(expect->master)->helper); |
| 579 | if (helper) { |
| 580 | seq_printf(s, "%s%s", expect->flags ? " " : "", helper->name); |
| 581 | if (helper->expect_policy[expect->class].name) |
| 582 | seq_printf(s, "/%s", |
| 583 | helper->expect_policy[expect->class].name); |
| 584 | } |
| 585 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 586 | return seq_putc(s, '\n'); |
| 587 | } |
| 588 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 589 | static const struct seq_operations exp_seq_ops = { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 590 | .start = exp_seq_start, |
| 591 | .next = exp_seq_next, |
| 592 | .stop = exp_seq_stop, |
| 593 | .show = exp_seq_show |
| 594 | }; |
| 595 | |
| 596 | static int exp_open(struct inode *inode, struct file *file) |
| 597 | { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 598 | return seq_open_net(inode, file, &exp_seq_ops, |
Pavel Emelyanov | e2da591 | 2007-10-10 02:29:58 -0700 | [diff] [blame] | 599 | sizeof(struct ct_expect_iter_state)); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 600 | } |
| 601 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 602 | static const struct file_operations exp_file_ops = { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 603 | .owner = THIS_MODULE, |
| 604 | .open = exp_open, |
| 605 | .read = seq_read, |
| 606 | .llseek = seq_lseek, |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 607 | .release = seq_release_net, |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 608 | }; |
| 609 | #endif /* CONFIG_PROC_FS */ |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 610 | |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 611 | static int exp_proc_init(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 612 | { |
| 613 | #ifdef CONFIG_PROC_FS |
| 614 | struct proc_dir_entry *proc; |
| 615 | |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 616 | 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] | 617 | if (!proc) |
| 618 | return -ENOMEM; |
| 619 | #endif /* CONFIG_PROC_FS */ |
| 620 | return 0; |
| 621 | } |
| 622 | |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 623 | static void exp_proc_remove(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 624 | { |
| 625 | #ifdef CONFIG_PROC_FS |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 626 | proc_net_remove(net, "nf_conntrack_expect"); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 627 | #endif /* CONFIG_PROC_FS */ |
| 628 | } |
| 629 | |
Alexey Dobriyan | 13ccdfc | 2010-02-08 11:17:22 -0800 | [diff] [blame] | 630 | module_param_named(expect_hashsize, nf_ct_expect_hsize, uint, 0400); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 631 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 632 | int nf_conntrack_expect_init(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 633 | { |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 634 | int err = -ENOMEM; |
| 635 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 636 | if (net_eq(net, &init_net)) { |
| 637 | if (!nf_ct_expect_hsize) { |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 638 | nf_ct_expect_hsize = net->ct.htable_size / 256; |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 639 | if (!nf_ct_expect_hsize) |
| 640 | nf_ct_expect_hsize = 1; |
| 641 | } |
| 642 | nf_ct_expect_max = nf_ct_expect_hsize * 4; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 643 | } |
| 644 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 645 | net->ct.expect_count = 0; |
| 646 | net->ct.expect_hash = nf_ct_alloc_hashtable(&nf_ct_expect_hsize, |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 647 | &net->ct.expect_vmalloc, 0); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 648 | if (net->ct.expect_hash == NULL) |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 649 | goto err1; |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 650 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 651 | if (net_eq(net, &init_net)) { |
| 652 | nf_ct_expect_cachep = kmem_cache_create("nf_conntrack_expect", |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 653 | sizeof(struct nf_conntrack_expect), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 654 | 0, 0, NULL); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 655 | if (!nf_ct_expect_cachep) |
| 656 | goto err2; |
| 657 | } |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 658 | |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 659 | err = exp_proc_init(net); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 660 | if (err < 0) |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 661 | goto err3; |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 662 | |
| 663 | return 0; |
| 664 | |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 665 | err3: |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 666 | if (net_eq(net, &init_net)) |
| 667 | kmem_cache_destroy(nf_ct_expect_cachep); |
Alexey Dobriyan | 12293bf | 2008-05-29 03:19:37 -0700 | [diff] [blame] | 668 | err2: |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 669 | nf_ct_free_hashtable(net->ct.expect_hash, net->ct.expect_vmalloc, |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 670 | nf_ct_expect_hsize); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 671 | err1: |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 672 | return err; |
| 673 | } |
| 674 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 675 | void nf_conntrack_expect_fini(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 676 | { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 677 | exp_proc_remove(net); |
Jesper Dangaard Brouer | 308ff82 | 2009-06-25 16:32:52 +0200 | [diff] [blame] | 678 | if (net_eq(net, &init_net)) { |
| 679 | rcu_barrier(); /* Wait for call_rcu() before destroy */ |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 680 | kmem_cache_destroy(nf_ct_expect_cachep); |
Jesper Dangaard Brouer | 308ff82 | 2009-06-25 16:32:52 +0200 | [diff] [blame] | 681 | } |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 682 | nf_ct_free_hashtable(net->ct.expect_hash, net->ct.expect_vmalloc, |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 683 | nf_ct_expect_hsize); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 684 | } |