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> |
Paul Gortmaker | d9b9384 | 2011-09-18 13:21:27 -0400 | [diff] [blame] | 23 | #include <linux/moduleparam.h> |
Paul Gortmaker | bc3b2d7 | 2011-07-15 11:47:34 -0400 | [diff] [blame] | 24 | #include <linux/export.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 25 | #include <net/net_namespace.h> |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 26 | |
| 27 | #include <net/netfilter/nf_conntrack.h> |
| 28 | #include <net/netfilter/nf_conntrack_core.h> |
| 29 | #include <net/netfilter/nf_conntrack_expect.h> |
| 30 | #include <net/netfilter/nf_conntrack_helper.h> |
| 31 | #include <net/netfilter/nf_conntrack_tuple.h> |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 32 | #include <net/netfilter/nf_conntrack_zones.h> |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 33 | |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 34 | unsigned int nf_ct_expect_hsize __read_mostly; |
| 35 | EXPORT_SYMBOL_GPL(nf_ct_expect_hsize); |
| 36 | |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 37 | unsigned int nf_ct_expect_max __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 | bc01bef | 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 | bc01bef | 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 | |
Changli Gao | f682cef | 2011-01-05 04:23:23 +0000 | [diff] [blame] | 80 | if (unlikely(!nf_conntrack_hash_rnd)) { |
| 81 | init_nf_conntrack_hash_rnd(); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 82 | } |
| 83 | |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 84 | hash = jhash2(tuple->dst.u3.all, ARRAY_SIZE(tuple->dst.u3.all), |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 85 | (((tuple->dst.protonum ^ tuple->src.l3num) << 16) | |
Changli Gao | f682cef | 2011-01-05 04:23:23 +0000 | [diff] [blame] | 86 | (__force __u16)tuple->dst.u.all) ^ nf_conntrack_hash_rnd); |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 87 | return ((u64)hash * nf_ct_expect_hsize) >> 32; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 88 | } |
| 89 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 90 | struct nf_conntrack_expect * |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 91 | __nf_ct_expect_find(struct net *net, u16 zone, |
| 92 | const struct nf_conntrack_tuple *tuple) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 93 | { |
| 94 | struct nf_conntrack_expect *i; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 95 | struct hlist_node *n; |
| 96 | unsigned int h; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 97 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 98 | if (!net->ct.expect_count) |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 99 | return NULL; |
| 100 | |
| 101 | h = nf_ct_expect_dst_hash(tuple); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 102 | 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] | 103 | if (nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask) && |
| 104 | nf_ct_zone(i->master) == zone) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 105 | return i; |
| 106 | } |
| 107 | return NULL; |
| 108 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 109 | EXPORT_SYMBOL_GPL(__nf_ct_expect_find); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 110 | |
| 111 | /* Just find a expectation corresponding to a tuple. */ |
| 112 | struct nf_conntrack_expect * |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 113 | nf_ct_expect_find_get(struct net *net, u16 zone, |
| 114 | const struct nf_conntrack_tuple *tuple) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 115 | { |
| 116 | struct nf_conntrack_expect *i; |
| 117 | |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 118 | rcu_read_lock(); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 119 | i = __nf_ct_expect_find(net, zone, tuple); |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 120 | if (i && !atomic_inc_not_zero(&i->use)) |
| 121 | i = NULL; |
| 122 | rcu_read_unlock(); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 123 | |
| 124 | return i; |
| 125 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 126 | EXPORT_SYMBOL_GPL(nf_ct_expect_find_get); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 127 | |
| 128 | /* If an expectation for this connection is found, it gets delete from |
| 129 | * global list then returned. */ |
| 130 | struct nf_conntrack_expect * |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 131 | nf_ct_find_expectation(struct net *net, u16 zone, |
| 132 | const struct nf_conntrack_tuple *tuple) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 133 | { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 134 | struct nf_conntrack_expect *i, *exp = NULL; |
| 135 | struct hlist_node *n; |
| 136 | unsigned int h; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 137 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 138 | if (!net->ct.expect_count) |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 139 | return NULL; |
| 140 | |
| 141 | h = nf_ct_expect_dst_hash(tuple); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 142 | hlist_for_each_entry(i, n, &net->ct.expect_hash[h], hnode) { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 143 | if (!(i->flags & NF_CT_EXPECT_INACTIVE) && |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 144 | nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask) && |
| 145 | nf_ct_zone(i->master) == zone) { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 146 | exp = i; |
| 147 | break; |
| 148 | } |
| 149 | } |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 150 | if (!exp) |
| 151 | return NULL; |
| 152 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 153 | /* If master is not in hash table yet (ie. packet hasn't left |
| 154 | this machine yet), how can other end know about expected? |
| 155 | Hence these are not the droids you are looking for (if |
| 156 | master ct never got confirmed, we'd hold a reference to it |
| 157 | and weird things would happen to future packets). */ |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 158 | if (!nf_ct_is_confirmed(exp->master)) |
| 159 | return NULL; |
| 160 | |
| 161 | if (exp->flags & NF_CT_EXPECT_PERMANENT) { |
| 162 | atomic_inc(&exp->use); |
| 163 | return exp; |
| 164 | } else if (del_timer(&exp->timeout)) { |
| 165 | nf_ct_unlink_expect(exp); |
| 166 | return exp; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 167 | } |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 168 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 169 | return NULL; |
| 170 | } |
| 171 | |
| 172 | /* delete all expectations for this conntrack */ |
| 173 | void nf_ct_remove_expectations(struct nf_conn *ct) |
| 174 | { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 175 | struct nf_conn_help *help = nfct_help(ct); |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 176 | struct nf_conntrack_expect *exp; |
| 177 | struct hlist_node *n, *next; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 178 | |
| 179 | /* Optimization: most connection never expect any others. */ |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 180 | if (!help) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 181 | return; |
| 182 | |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 183 | hlist_for_each_entry_safe(exp, n, next, &help->expectations, lnode) { |
| 184 | if (del_timer(&exp->timeout)) { |
| 185 | nf_ct_unlink_expect(exp); |
| 186 | nf_ct_expect_put(exp); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 187 | } |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 188 | } |
| 189 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 190 | EXPORT_SYMBOL_GPL(nf_ct_remove_expectations); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 191 | |
| 192 | /* Would two expected things clash? */ |
| 193 | static inline int expect_clash(const struct nf_conntrack_expect *a, |
| 194 | const struct nf_conntrack_expect *b) |
| 195 | { |
| 196 | /* Part covered by intersection of masks must be unequal, |
| 197 | otherwise they clash */ |
Patrick McHardy | d4156e8 | 2007-07-07 22:31:32 -0700 | [diff] [blame] | 198 | struct nf_conntrack_tuple_mask intersect_mask; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 199 | int count; |
| 200 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 201 | 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] | 202 | |
| 203 | for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){ |
| 204 | intersect_mask.src.u3.all[count] = |
| 205 | a->mask.src.u3.all[count] & b->mask.src.u3.all[count]; |
| 206 | } |
| 207 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 208 | return nf_ct_tuple_mask_cmp(&a->tuple, &b->tuple, &intersect_mask); |
| 209 | } |
| 210 | |
| 211 | static inline int expect_matches(const struct nf_conntrack_expect *a, |
| 212 | const struct nf_conntrack_expect *b) |
| 213 | { |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 214 | return a->master == b->master && a->class == b->class && |
| 215 | nf_ct_tuple_equal(&a->tuple, &b->tuple) && |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 216 | nf_ct_tuple_mask_equal(&a->mask, &b->mask) && |
| 217 | nf_ct_zone(a->master) == nf_ct_zone(b->master); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | /* Generally a bad idea to call this: could have matched already. */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 221 | void nf_ct_unexpect_related(struct nf_conntrack_expect *exp) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 222 | { |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 223 | spin_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | 4e1d4e6 | 2007-07-07 22:32:03 -0700 | [diff] [blame] | 224 | if (del_timer(&exp->timeout)) { |
| 225 | nf_ct_unlink_expect(exp); |
| 226 | nf_ct_expect_put(exp); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 227 | } |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 228 | spin_unlock_bh(&nf_conntrack_lock); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 229 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 230 | EXPORT_SYMBOL_GPL(nf_ct_unexpect_related); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 231 | |
| 232 | /* We don't increase the master conntrack refcount for non-fulfilled |
| 233 | * conntracks. During the conntrack destruction, the expectations are |
| 234 | * always killed before the conntrack itself */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 235 | struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 236 | { |
| 237 | struct nf_conntrack_expect *new; |
| 238 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 239 | new = kmem_cache_alloc(nf_ct_expect_cachep, GFP_ATOMIC); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 240 | if (!new) |
| 241 | return NULL; |
| 242 | |
| 243 | new->master = me; |
| 244 | atomic_set(&new->use, 1); |
| 245 | return new; |
| 246 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 247 | EXPORT_SYMBOL_GPL(nf_ct_expect_alloc); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 248 | |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 249 | 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] | 250 | u_int8_t family, |
Patrick McHardy | 1d9d752 | 2008-03-25 20:07:58 -0700 | [diff] [blame] | 251 | const union nf_inet_addr *saddr, |
| 252 | const union nf_inet_addr *daddr, |
| 253 | u_int8_t proto, const __be16 *src, const __be16 *dst) |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 254 | { |
| 255 | int len; |
| 256 | |
| 257 | if (family == AF_INET) |
| 258 | len = 4; |
| 259 | else |
| 260 | len = 16; |
| 261 | |
| 262 | exp->flags = 0; |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 263 | exp->class = class; |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 264 | exp->expectfn = NULL; |
| 265 | exp->helper = NULL; |
| 266 | exp->tuple.src.l3num = family; |
| 267 | exp->tuple.dst.protonum = proto; |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 268 | |
| 269 | if (saddr) { |
| 270 | memcpy(&exp->tuple.src.u3, saddr, len); |
| 271 | if (sizeof(exp->tuple.src.u3) > len) |
| 272 | /* address needs to be cleared for nf_ct_tuple_equal */ |
| 273 | memset((void *)&exp->tuple.src.u3 + len, 0x00, |
| 274 | sizeof(exp->tuple.src.u3) - len); |
| 275 | memset(&exp->mask.src.u3, 0xFF, len); |
| 276 | if (sizeof(exp->mask.src.u3) > len) |
| 277 | memset((void *)&exp->mask.src.u3 + len, 0x00, |
| 278 | sizeof(exp->mask.src.u3) - len); |
| 279 | } else { |
| 280 | memset(&exp->tuple.src.u3, 0x00, sizeof(exp->tuple.src.u3)); |
| 281 | memset(&exp->mask.src.u3, 0x00, sizeof(exp->mask.src.u3)); |
| 282 | } |
| 283 | |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 284 | if (src) { |
Al Viro | a34c458 | 2007-07-26 17:33:19 +0100 | [diff] [blame] | 285 | exp->tuple.src.u.all = *src; |
| 286 | exp->mask.src.u.all = htons(0xFFFF); |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 287 | } else { |
| 288 | exp->tuple.src.u.all = 0; |
| 289 | exp->mask.src.u.all = 0; |
| 290 | } |
| 291 | |
Patrick McHardy | d4156e8 | 2007-07-07 22:31:32 -0700 | [diff] [blame] | 292 | memcpy(&exp->tuple.dst.u3, daddr, len); |
| 293 | if (sizeof(exp->tuple.dst.u3) > len) |
| 294 | /* address needs to be cleared for nf_ct_tuple_equal */ |
| 295 | memset((void *)&exp->tuple.dst.u3 + len, 0x00, |
| 296 | sizeof(exp->tuple.dst.u3) - len); |
| 297 | |
Al Viro | a34c458 | 2007-07-26 17:33:19 +0100 | [diff] [blame] | 298 | exp->tuple.dst.u.all = *dst; |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 299 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 300 | EXPORT_SYMBOL_GPL(nf_ct_expect_init); |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 301 | |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 302 | static void nf_ct_expect_free_rcu(struct rcu_head *head) |
| 303 | { |
| 304 | struct nf_conntrack_expect *exp; |
| 305 | |
| 306 | exp = container_of(head, struct nf_conntrack_expect, rcu); |
| 307 | kmem_cache_free(nf_ct_expect_cachep, exp); |
| 308 | } |
| 309 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 310 | void nf_ct_expect_put(struct nf_conntrack_expect *exp) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 311 | { |
| 312 | if (atomic_dec_and_test(&exp->use)) |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 313 | call_rcu(&exp->rcu, nf_ct_expect_free_rcu); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 314 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 315 | EXPORT_SYMBOL_GPL(nf_ct_expect_put); |
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 | static void nf_ct_expect_insert(struct nf_conntrack_expect *exp) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 318 | { |
| 319 | struct nf_conn_help *master_help = nfct_help(exp->master); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 320 | struct net *net = nf_ct_exp_net(exp); |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 321 | const struct nf_conntrack_expect_policy *p; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 322 | unsigned int h = nf_ct_expect_dst_hash(&exp->tuple); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 323 | |
Eric Dumazet | 3bfd45f | 2010-11-16 10:19:18 +0100 | [diff] [blame] | 324 | /* two references : one for hash insert, one for the timer */ |
| 325 | atomic_add(2, &exp->use); |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 326 | |
Pablo Neira Ayuso | bc01bef | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 327 | if (master_help) { |
| 328 | hlist_add_head(&exp->lnode, &master_help->expectations); |
| 329 | master_help->expecting[exp->class]++; |
| 330 | } else if (exp->flags & NF_CT_EXPECT_USERSPACE) |
| 331 | hlist_add_head(&exp->lnode, &nf_ct_userspace_expect_list); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 332 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 333 | hlist_add_head_rcu(&exp->hnode, &net->ct.expect_hash[h]); |
| 334 | net->ct.expect_count++; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 335 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 336 | setup_timer(&exp->timeout, nf_ct_expectation_timed_out, |
| 337 | (unsigned long)exp); |
Pablo Neira Ayuso | bc01bef | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 338 | if (master_help) { |
Eric Dumazet | c5d277d | 2010-11-15 19:45:13 +0100 | [diff] [blame] | 339 | p = &rcu_dereference_protected( |
| 340 | master_help->helper, |
| 341 | lockdep_is_held(&nf_conntrack_lock) |
| 342 | )->expect_policy[exp->class]; |
Pablo Neira Ayuso | bc01bef | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 343 | exp->timeout.expires = jiffies + p->timeout * HZ; |
| 344 | } |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 345 | add_timer(&exp->timeout); |
| 346 | |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 347 | NF_CT_STAT_INC(net, expect_create); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | /* 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] | 351 | static void evict_oldest_expect(struct nf_conn *master, |
| 352 | struct nf_conntrack_expect *new) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 353 | { |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 354 | struct nf_conn_help *master_help = nfct_help(master); |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 355 | struct nf_conntrack_expect *exp, *last = NULL; |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 356 | struct hlist_node *n; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 357 | |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 358 | hlist_for_each_entry(exp, n, &master_help->expectations, lnode) { |
| 359 | if (exp->class == new->class) |
| 360 | last = exp; |
| 361 | } |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 362 | |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 363 | if (last && del_timer(&last->timeout)) { |
| 364 | nf_ct_unlink_expect(last); |
| 365 | nf_ct_expect_put(last); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 366 | } |
| 367 | } |
| 368 | |
| 369 | static inline int refresh_timer(struct nf_conntrack_expect *i) |
| 370 | { |
| 371 | struct nf_conn_help *master_help = nfct_help(i->master); |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 372 | const struct nf_conntrack_expect_policy *p; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 373 | |
| 374 | if (!del_timer(&i->timeout)) |
| 375 | return 0; |
| 376 | |
Eric Dumazet | c5d277d | 2010-11-15 19:45:13 +0100 | [diff] [blame] | 377 | p = &rcu_dereference_protected( |
| 378 | master_help->helper, |
| 379 | lockdep_is_held(&nf_conntrack_lock) |
| 380 | )->expect_policy[i->class]; |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 381 | i->timeout.expires = jiffies + p->timeout * HZ; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 382 | add_timer(&i->timeout); |
| 383 | return 1; |
| 384 | } |
| 385 | |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 386 | static inline int __nf_ct_expect_check(struct nf_conntrack_expect *expect) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 387 | { |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 388 | const struct nf_conntrack_expect_policy *p; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 389 | struct nf_conntrack_expect *i; |
| 390 | struct nf_conn *master = expect->master; |
| 391 | struct nf_conn_help *master_help = nfct_help(master); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 392 | struct net *net = nf_ct_exp_net(expect); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 393 | struct hlist_node *n; |
| 394 | unsigned int h; |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 395 | int ret = 1; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 396 | |
Pablo Neira Ayuso | bc01bef | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 397 | /* Don't allow expectations created from kernel-space with no helper */ |
| 398 | if (!(expect->flags & NF_CT_EXPECT_USERSPACE) && |
| 399 | (!master_help || (master_help && !master_help->helper))) { |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 400 | ret = -ESHUTDOWN; |
| 401 | goto out; |
| 402 | } |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 403 | h = nf_ct_expect_dst_hash(&expect->tuple); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 404 | hlist_for_each_entry(i, n, &net->ct.expect_hash[h], hnode) { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 405 | if (expect_matches(i, expect)) { |
| 406 | /* Refresh timer: if it's dying, ignore.. */ |
| 407 | if (refresh_timer(i)) { |
| 408 | ret = 0; |
| 409 | goto out; |
| 410 | } |
| 411 | } else if (expect_clash(i, expect)) { |
| 412 | ret = -EBUSY; |
| 413 | goto out; |
| 414 | } |
| 415 | } |
| 416 | /* Will be over limit? */ |
Pablo Neira Ayuso | bc01bef | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 417 | if (master_help) { |
Eric Dumazet | c5d277d | 2010-11-15 19:45:13 +0100 | [diff] [blame] | 418 | p = &rcu_dereference_protected( |
| 419 | master_help->helper, |
| 420 | lockdep_is_held(&nf_conntrack_lock) |
| 421 | )->expect_policy[expect->class]; |
Pablo Neira Ayuso | bc01bef | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 422 | if (p->max_expected && |
| 423 | master_help->expecting[expect->class] >= p->max_expected) { |
| 424 | evict_oldest_expect(master, expect); |
| 425 | if (master_help->expecting[expect->class] |
| 426 | >= p->max_expected) { |
| 427 | ret = -EMFILE; |
| 428 | goto out; |
| 429 | } |
Patrick McHardy | 6002f26 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 430 | } |
| 431 | } |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 432 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 433 | if (net->ct.expect_count >= nf_ct_expect_max) { |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 434 | if (net_ratelimit()) |
| 435 | printk(KERN_WARNING |
Alexey Dobriyan | 3d89e9c | 2008-03-10 16:43:10 -0700 | [diff] [blame] | 436 | "nf_conntrack: expectation table full\n"); |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 437 | ret = -EMFILE; |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 438 | } |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 439 | out: |
| 440 | return ret; |
| 441 | } |
| 442 | |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 443 | int nf_ct_expect_related_report(struct nf_conntrack_expect *expect, |
| 444 | u32 pid, int report) |
| 445 | { |
| 446 | int ret; |
| 447 | |
| 448 | spin_lock_bh(&nf_conntrack_lock); |
| 449 | ret = __nf_ct_expect_check(expect); |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 450 | if (ret <= 0) |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 451 | goto out; |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 452 | |
| 453 | ret = 0; |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 454 | nf_ct_expect_insert(expect); |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 455 | spin_unlock_bh(&nf_conntrack_lock); |
| 456 | nf_ct_expect_event_report(IPEXP_NEW, expect, pid, report); |
| 457 | return ret; |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 458 | out: |
| 459 | spin_unlock_bh(&nf_conntrack_lock); |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 460 | return ret; |
| 461 | } |
| 462 | EXPORT_SYMBOL_GPL(nf_ct_expect_related_report); |
| 463 | |
Pablo Neira Ayuso | bc01bef | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 464 | void nf_ct_remove_userspace_expectations(void) |
| 465 | { |
| 466 | struct nf_conntrack_expect *exp; |
| 467 | struct hlist_node *n, *next; |
| 468 | |
| 469 | hlist_for_each_entry_safe(exp, n, next, |
| 470 | &nf_ct_userspace_expect_list, lnode) { |
| 471 | if (del_timer(&exp->timeout)) { |
| 472 | nf_ct_unlink_expect(exp); |
| 473 | nf_ct_expect_put(exp); |
| 474 | } |
| 475 | } |
| 476 | } |
| 477 | EXPORT_SYMBOL_GPL(nf_ct_remove_userspace_expectations); |
| 478 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 479 | #ifdef CONFIG_PROC_FS |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 480 | struct ct_expect_iter_state { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 481 | struct seq_net_private p; |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 482 | unsigned int bucket; |
| 483 | }; |
| 484 | |
| 485 | static struct hlist_node *ct_expect_get_first(struct seq_file *seq) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 486 | { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 487 | struct net *net = seq_file_net(seq); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 488 | struct ct_expect_iter_state *st = seq->private; |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 489 | struct hlist_node *n; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 490 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 491 | for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) { |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 492 | n = rcu_dereference(hlist_first_rcu(&net->ct.expect_hash[st->bucket])); |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 493 | if (n) |
| 494 | return n; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 495 | } |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 496 | return NULL; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 497 | } |
| 498 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 499 | static struct hlist_node *ct_expect_get_next(struct seq_file *seq, |
| 500 | struct hlist_node *head) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 501 | { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 502 | struct net *net = seq_file_net(seq); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 503 | struct ct_expect_iter_state *st = seq->private; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 504 | |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 505 | head = rcu_dereference(hlist_next_rcu(head)); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 506 | while (head == NULL) { |
| 507 | if (++st->bucket >= nf_ct_expect_hsize) |
| 508 | return NULL; |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 509 | head = rcu_dereference(hlist_first_rcu(&net->ct.expect_hash[st->bucket])); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 510 | } |
| 511 | return head; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 512 | } |
| 513 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 514 | static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos) |
| 515 | { |
| 516 | struct hlist_node *head = ct_expect_get_first(seq); |
| 517 | |
| 518 | if (head) |
| 519 | while (pos && (head = ct_expect_get_next(seq, head))) |
| 520 | pos--; |
| 521 | return pos ? NULL : head; |
| 522 | } |
| 523 | |
| 524 | static void *exp_seq_start(struct seq_file *seq, loff_t *pos) |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 525 | __acquires(RCU) |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 526 | { |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 527 | rcu_read_lock(); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 528 | return ct_expect_get_idx(seq, *pos); |
| 529 | } |
| 530 | |
| 531 | static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 532 | { |
| 533 | (*pos)++; |
| 534 | return ct_expect_get_next(seq, v); |
| 535 | } |
| 536 | |
| 537 | static void exp_seq_stop(struct seq_file *seq, void *v) |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 538 | __releases(RCU) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 539 | { |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 540 | rcu_read_unlock(); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 541 | } |
| 542 | |
| 543 | static int exp_seq_show(struct seq_file *s, void *v) |
| 544 | { |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 545 | struct nf_conntrack_expect *expect; |
Patrick McHardy | b87921b | 2010-02-11 12:22:48 +0100 | [diff] [blame] | 546 | struct nf_conntrack_helper *helper; |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 547 | struct hlist_node *n = v; |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 548 | char *delim = ""; |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 549 | |
| 550 | expect = hlist_entry(n, struct nf_conntrack_expect, hnode); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 551 | |
| 552 | if (expect->timeout.function) |
| 553 | seq_printf(s, "%ld ", timer_pending(&expect->timeout) |
| 554 | ? (long)(expect->timeout.expires - jiffies)/HZ : 0); |
| 555 | else |
| 556 | seq_printf(s, "- "); |
| 557 | seq_printf(s, "l3proto = %u proto=%u ", |
| 558 | expect->tuple.src.l3num, |
| 559 | expect->tuple.dst.protonum); |
| 560 | print_tuple(s, &expect->tuple, |
| 561 | __nf_ct_l3proto_find(expect->tuple.src.l3num), |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 562 | __nf_ct_l4proto_find(expect->tuple.src.l3num, |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 563 | expect->tuple.dst.protonum)); |
Patrick McHardy | 4bb119e | 2008-03-25 20:08:17 -0700 | [diff] [blame] | 564 | |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 565 | if (expect->flags & NF_CT_EXPECT_PERMANENT) { |
| 566 | seq_printf(s, "PERMANENT"); |
| 567 | delim = ","; |
| 568 | } |
Pablo Neira Ayuso | bc01bef | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 569 | if (expect->flags & NF_CT_EXPECT_INACTIVE) { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 570 | seq_printf(s, "%sINACTIVE", delim); |
Pablo Neira Ayuso | bc01bef | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 571 | delim = ","; |
| 572 | } |
| 573 | if (expect->flags & NF_CT_EXPECT_USERSPACE) |
| 574 | seq_printf(s, "%sUSERSPACE", delim); |
Patrick McHardy | 4bb119e | 2008-03-25 20:08:17 -0700 | [diff] [blame] | 575 | |
Patrick McHardy | b87921b | 2010-02-11 12:22:48 +0100 | [diff] [blame] | 576 | helper = rcu_dereference(nfct_help(expect->master)->helper); |
| 577 | if (helper) { |
| 578 | seq_printf(s, "%s%s", expect->flags ? " " : "", helper->name); |
| 579 | if (helper->expect_policy[expect->class].name) |
| 580 | seq_printf(s, "/%s", |
| 581 | helper->expect_policy[expect->class].name); |
| 582 | } |
| 583 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 584 | return seq_putc(s, '\n'); |
| 585 | } |
| 586 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 587 | static const struct seq_operations exp_seq_ops = { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 588 | .start = exp_seq_start, |
| 589 | .next = exp_seq_next, |
| 590 | .stop = exp_seq_stop, |
| 591 | .show = exp_seq_show |
| 592 | }; |
| 593 | |
| 594 | static int exp_open(struct inode *inode, struct file *file) |
| 595 | { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 596 | return seq_open_net(inode, file, &exp_seq_ops, |
Pavel Emelyanov | e2da591 | 2007-10-10 02:29:58 -0700 | [diff] [blame] | 597 | sizeof(struct ct_expect_iter_state)); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 598 | } |
| 599 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 600 | static const struct file_operations exp_file_ops = { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 601 | .owner = THIS_MODULE, |
| 602 | .open = exp_open, |
| 603 | .read = seq_read, |
| 604 | .llseek = seq_lseek, |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 605 | .release = seq_release_net, |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 606 | }; |
| 607 | #endif /* CONFIG_PROC_FS */ |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 608 | |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 609 | static int exp_proc_init(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 610 | { |
| 611 | #ifdef CONFIG_PROC_FS |
| 612 | struct proc_dir_entry *proc; |
| 613 | |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 614 | 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] | 615 | if (!proc) |
| 616 | return -ENOMEM; |
| 617 | #endif /* CONFIG_PROC_FS */ |
| 618 | return 0; |
| 619 | } |
| 620 | |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 621 | static void exp_proc_remove(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 622 | { |
| 623 | #ifdef CONFIG_PROC_FS |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 624 | proc_net_remove(net, "nf_conntrack_expect"); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 625 | #endif /* CONFIG_PROC_FS */ |
| 626 | } |
| 627 | |
Alexey Dobriyan | 13ccdfc | 2010-02-08 11:17:22 -0800 | [diff] [blame] | 628 | module_param_named(expect_hashsize, nf_ct_expect_hsize, uint, 0400); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 629 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 630 | int nf_conntrack_expect_init(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 631 | { |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 632 | int err = -ENOMEM; |
| 633 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 634 | if (net_eq(net, &init_net)) { |
| 635 | if (!nf_ct_expect_hsize) { |
Patrick McHardy | d696c7b | 2010-02-08 11:18:07 -0800 | [diff] [blame] | 636 | nf_ct_expect_hsize = net->ct.htable_size / 256; |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 637 | if (!nf_ct_expect_hsize) |
| 638 | nf_ct_expect_hsize = 1; |
| 639 | } |
| 640 | nf_ct_expect_max = nf_ct_expect_hsize * 4; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 641 | } |
| 642 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 643 | net->ct.expect_count = 0; |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 644 | net->ct.expect_hash = nf_ct_alloc_hashtable(&nf_ct_expect_hsize, 0); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 645 | if (net->ct.expect_hash == NULL) |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 646 | goto err1; |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 647 | |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 648 | if (net_eq(net, &init_net)) { |
| 649 | nf_ct_expect_cachep = kmem_cache_create("nf_conntrack_expect", |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 650 | sizeof(struct nf_conntrack_expect), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 651 | 0, 0, NULL); |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 652 | if (!nf_ct_expect_cachep) |
| 653 | goto err2; |
| 654 | } |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 655 | |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 656 | err = exp_proc_init(net); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 657 | if (err < 0) |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 658 | goto err3; |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 659 | |
| 660 | return 0; |
| 661 | |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 662 | err3: |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 663 | if (net_eq(net, &init_net)) |
| 664 | kmem_cache_destroy(nf_ct_expect_cachep); |
Alexey Dobriyan | 12293bf | 2008-05-29 03:19:37 -0700 | [diff] [blame] | 665 | err2: |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 666 | nf_ct_free_hashtable(net->ct.expect_hash, nf_ct_expect_hsize); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 667 | err1: |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 668 | return err; |
| 669 | } |
| 670 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 671 | void nf_conntrack_expect_fini(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 672 | { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 673 | exp_proc_remove(net); |
Jesper Dangaard Brouer | 308ff82 | 2009-06-25 16:32:52 +0200 | [diff] [blame] | 674 | if (net_eq(net, &init_net)) { |
| 675 | rcu_barrier(); /* Wait for call_rcu() before destroy */ |
Alexey Dobriyan | 08f6547 | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 676 | kmem_cache_destroy(nf_ct_expect_cachep); |
Jesper Dangaard Brouer | 308ff82 | 2009-06-25 16:32:52 +0200 | [diff] [blame] | 677 | } |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 678 | nf_ct_free_hashtable(net->ct.expect_hash, nf_ct_expect_hsize); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 679 | } |