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> |
Patrick McHardy | f229f6c | 2013-04-06 15:24:29 +0200 | [diff] [blame] | 6 | * (c) 2005-2012 Patrick McHardy <kaber@trash.net> |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/types.h> |
| 14 | #include <linux/netfilter.h> |
| 15 | #include <linux/skbuff.h> |
| 16 | #include <linux/proc_fs.h> |
| 17 | #include <linux/seq_file.h> |
| 18 | #include <linux/stddef.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/err.h> |
| 21 | #include <linux/percpu.h> |
| 22 | #include <linux/kernel.h> |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 23 | #include <linux/jhash.h> |
Paul Gortmaker | d9b9384 | 2011-09-18 13:21:27 -0400 | [diff] [blame] | 24 | #include <linux/moduleparam.h> |
Paul Gortmaker | bc3b2d7 | 2011-07-15 11:47:34 -0400 | [diff] [blame] | 25 | #include <linux/export.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 26 | #include <net/net_namespace.h> |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 27 | |
| 28 | #include <net/netfilter/nf_conntrack.h> |
| 29 | #include <net/netfilter/nf_conntrack_core.h> |
| 30 | #include <net/netfilter/nf_conntrack_expect.h> |
| 31 | #include <net/netfilter/nf_conntrack_helper.h> |
| 32 | #include <net/netfilter/nf_conntrack_tuple.h> |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 33 | #include <net/netfilter/nf_conntrack_zones.h> |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 34 | |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 35 | unsigned int nf_ct_expect_hsize __read_mostly; |
| 36 | EXPORT_SYMBOL_GPL(nf_ct_expect_hsize); |
| 37 | |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 38 | unsigned int nf_ct_expect_max __read_mostly; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 39 | |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 40 | static struct kmem_cache *nf_ct_expect_cachep __read_mostly; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 41 | |
| 42 | /* nf_conntrack_expect helper functions */ |
Pablo Neira Ayuso | ebbf41d | 2010-10-19 10:19:06 +0200 | [diff] [blame] | 43 | void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp, |
Patrick McHardy | ec464e5 | 2013-04-17 06:47:08 +0000 | [diff] [blame] | 44 | u32 portid, int report) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 45 | { |
| 46 | struct nf_conn_help *master_help = nfct_help(exp->master); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 47 | struct net *net = nf_ct_exp_net(exp); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 48 | |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 49 | NF_CT_ASSERT(master_help); |
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 | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 56 | master_help->expecting[exp->class]--; |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 57 | |
Patrick McHardy | ec464e5 | 2013-04-17 06:47:08 +0000 | [diff] [blame] | 58 | nf_ct_expect_event_report(IPEXP_DESTROY, exp, portid, report); |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 59 | nf_ct_expect_put(exp); |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 60 | |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 61 | NF_CT_STAT_INC(net, expect_delete); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 62 | } |
Pablo Neira Ayuso | ebbf41d | 2010-10-19 10:19:06 +0200 | [diff] [blame] | 63 | EXPORT_SYMBOL_GPL(nf_ct_unlink_expect_report); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 64 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 65 | static void nf_ct_expectation_timed_out(unsigned long ul_expect) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 66 | { |
| 67 | struct nf_conntrack_expect *exp = (void *)ul_expect; |
| 68 | |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 69 | spin_lock_bh(&nf_conntrack_expect_lock); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 70 | nf_ct_unlink_expect(exp); |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 71 | spin_unlock_bh(&nf_conntrack_expect_lock); |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 72 | nf_ct_expect_put(exp); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 73 | } |
| 74 | |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 75 | static unsigned int nf_ct_expect_dst_hash(const struct nf_conntrack_tuple *tuple) |
| 76 | { |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 77 | unsigned int hash; |
| 78 | |
Changli Gao | f682cef | 2011-01-05 04:23:23 +0000 | [diff] [blame] | 79 | if (unlikely(!nf_conntrack_hash_rnd)) { |
| 80 | init_nf_conntrack_hash_rnd(); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 81 | } |
| 82 | |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 83 | hash = jhash2(tuple->dst.u3.all, ARRAY_SIZE(tuple->dst.u3.all), |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 84 | (((tuple->dst.protonum ^ tuple->src.l3num) << 16) | |
Changli Gao | f682cef | 2011-01-05 04:23:23 +0000 | [diff] [blame] | 85 | (__force __u16)tuple->dst.u.all) ^ nf_conntrack_hash_rnd); |
Daniel Borkmann | 8fc54f6 | 2014-08-23 20:58:54 +0200 | [diff] [blame] | 86 | |
| 87 | return reciprocal_scale(hash, nf_ct_expect_hsize); |
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 * |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 91 | __nf_ct_expect_find(struct net *net, |
| 92 | const struct nf_conntrack_zone *zone, |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 93 | const struct nf_conntrack_tuple *tuple) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 94 | { |
| 95 | struct nf_conntrack_expect *i; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 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); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 102 | hlist_for_each_entry_rcu(i, &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) && |
Daniel Borkmann | deedb59 | 2015-08-14 16:03:39 +0200 | [diff] [blame] | 104 | nf_ct_zone_equal_any(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 * |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 113 | nf_ct_expect_find_get(struct net *net, |
| 114 | const struct nf_conntrack_zone *zone, |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 115 | const struct nf_conntrack_tuple *tuple) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 116 | { |
| 117 | struct nf_conntrack_expect *i; |
| 118 | |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 119 | rcu_read_lock(); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 120 | i = __nf_ct_expect_find(net, zone, tuple); |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 121 | if (i && !atomic_inc_not_zero(&i->use)) |
| 122 | i = NULL; |
| 123 | rcu_read_unlock(); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 124 | |
| 125 | return i; |
| 126 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 127 | EXPORT_SYMBOL_GPL(nf_ct_expect_find_get); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 128 | |
| 129 | /* If an expectation for this connection is found, it gets delete from |
| 130 | * global list then returned. */ |
| 131 | struct nf_conntrack_expect * |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 132 | nf_ct_find_expectation(struct net *net, |
| 133 | const struct nf_conntrack_zone *zone, |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 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; |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 137 | unsigned int h; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 138 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 139 | if (!net->ct.expect_count) |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 140 | return NULL; |
| 141 | |
| 142 | h = nf_ct_expect_dst_hash(tuple); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 143 | hlist_for_each_entry(i, &net->ct.expect_hash[h], hnode) { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 144 | if (!(i->flags & NF_CT_EXPECT_INACTIVE) && |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 145 | nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask) && |
Daniel Borkmann | deedb59 | 2015-08-14 16:03:39 +0200 | [diff] [blame] | 146 | nf_ct_zone_equal_any(i->master, zone)) { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 147 | exp = i; |
| 148 | break; |
| 149 | } |
| 150 | } |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 151 | if (!exp) |
| 152 | return NULL; |
| 153 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 154 | /* If master is not in hash table yet (ie. packet hasn't left |
| 155 | this machine yet), how can other end know about expected? |
| 156 | Hence these are not the droids you are looking for (if |
| 157 | master ct never got confirmed, we'd hold a reference to it |
| 158 | and weird things would happen to future packets). */ |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 159 | if (!nf_ct_is_confirmed(exp->master)) |
| 160 | return NULL; |
| 161 | |
Jesper Dangaard Brouer | e1b207d | 2014-03-03 14:45:39 +0100 | [diff] [blame] | 162 | /* Avoid race with other CPUs, that for exp->master ct, is |
| 163 | * about to invoke ->destroy(), or nf_ct_delete() via timeout |
| 164 | * or early_drop(). |
| 165 | * |
| 166 | * The atomic_inc_not_zero() check tells: If that fails, we |
| 167 | * know that the ct is being destroyed. If it succeeds, we |
| 168 | * can be sure the ct cannot disappear underneath. |
| 169 | */ |
| 170 | if (unlikely(nf_ct_is_dying(exp->master) || |
| 171 | !atomic_inc_not_zero(&exp->master->ct_general.use))) |
| 172 | return NULL; |
| 173 | |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 174 | if (exp->flags & NF_CT_EXPECT_PERMANENT) { |
| 175 | atomic_inc(&exp->use); |
| 176 | return exp; |
| 177 | } else if (del_timer(&exp->timeout)) { |
| 178 | nf_ct_unlink_expect(exp); |
| 179 | return exp; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 180 | } |
Jesper Dangaard Brouer | e1b207d | 2014-03-03 14:45:39 +0100 | [diff] [blame] | 181 | /* Undo exp->master refcnt increase, if del_timer() failed */ |
| 182 | nf_ct_put(exp->master); |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 183 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 184 | return NULL; |
| 185 | } |
| 186 | |
| 187 | /* delete all expectations for this conntrack */ |
| 188 | void nf_ct_remove_expectations(struct nf_conn *ct) |
| 189 | { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 190 | struct nf_conn_help *help = nfct_help(ct); |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 191 | struct nf_conntrack_expect *exp; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 192 | struct hlist_node *next; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 193 | |
| 194 | /* Optimization: most connection never expect any others. */ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 195 | if (!help) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 196 | return; |
| 197 | |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 198 | spin_lock_bh(&nf_conntrack_expect_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 199 | hlist_for_each_entry_safe(exp, next, &help->expectations, lnode) { |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 200 | if (del_timer(&exp->timeout)) { |
| 201 | nf_ct_unlink_expect(exp); |
| 202 | nf_ct_expect_put(exp); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 203 | } |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 204 | } |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 205 | spin_unlock_bh(&nf_conntrack_expect_lock); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 206 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 207 | EXPORT_SYMBOL_GPL(nf_ct_remove_expectations); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 208 | |
| 209 | /* Would two expected things clash? */ |
| 210 | static inline int expect_clash(const struct nf_conntrack_expect *a, |
| 211 | const struct nf_conntrack_expect *b) |
| 212 | { |
| 213 | /* Part covered by intersection of masks must be unequal, |
| 214 | otherwise they clash */ |
Patrick McHardy | d4156e8 | 2007-07-07 22:31:32 -0700 | [diff] [blame] | 215 | struct nf_conntrack_tuple_mask intersect_mask; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 216 | int count; |
| 217 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 218 | 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] | 219 | |
| 220 | for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){ |
| 221 | intersect_mask.src.u3.all[count] = |
| 222 | a->mask.src.u3.all[count] & b->mask.src.u3.all[count]; |
| 223 | } |
| 224 | |
Joe Stringer | 4b31814 | 2015-07-21 21:37:31 -0700 | [diff] [blame] | 225 | return nf_ct_tuple_mask_cmp(&a->tuple, &b->tuple, &intersect_mask) && |
Daniel Borkmann | deedb59 | 2015-08-14 16:03:39 +0200 | [diff] [blame] | 226 | nf_ct_zone_equal_any(a->master, nf_ct_zone(b->master)); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 227 | } |
| 228 | |
| 229 | static inline int expect_matches(const struct nf_conntrack_expect *a, |
| 230 | const struct nf_conntrack_expect *b) |
| 231 | { |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 232 | return a->master == b->master && a->class == b->class && |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 233 | nf_ct_tuple_equal(&a->tuple, &b->tuple) && |
| 234 | nf_ct_tuple_mask_equal(&a->mask, &b->mask) && |
Daniel Borkmann | deedb59 | 2015-08-14 16:03:39 +0200 | [diff] [blame] | 235 | nf_ct_zone_equal_any(a->master, nf_ct_zone(b->master)); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | /* Generally a bad idea to call this: could have matched already. */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 239 | void nf_ct_unexpect_related(struct nf_conntrack_expect *exp) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 240 | { |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 241 | spin_lock_bh(&nf_conntrack_expect_lock); |
Patrick McHardy | 4e1d4e6 | 2007-07-07 22:32:03 -0700 | [diff] [blame] | 242 | if (del_timer(&exp->timeout)) { |
| 243 | nf_ct_unlink_expect(exp); |
| 244 | nf_ct_expect_put(exp); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 245 | } |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 246 | spin_unlock_bh(&nf_conntrack_expect_lock); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 247 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 248 | EXPORT_SYMBOL_GPL(nf_ct_unexpect_related); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 249 | |
| 250 | /* We don't increase the master conntrack refcount for non-fulfilled |
| 251 | * conntracks. During the conntrack destruction, the expectations are |
| 252 | * always killed before the conntrack itself */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 253 | struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 254 | { |
| 255 | struct nf_conntrack_expect *new; |
| 256 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 257 | new = kmem_cache_alloc(nf_ct_expect_cachep, GFP_ATOMIC); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 258 | if (!new) |
| 259 | return NULL; |
| 260 | |
| 261 | new->master = me; |
| 262 | atomic_set(&new->use, 1); |
| 263 | return new; |
| 264 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 265 | EXPORT_SYMBOL_GPL(nf_ct_expect_alloc); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 266 | |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 267 | 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] | 268 | u_int8_t family, |
Patrick McHardy | 1d9d752 | 2008-03-25 20:07:58 -0700 | [diff] [blame] | 269 | const union nf_inet_addr *saddr, |
| 270 | const union nf_inet_addr *daddr, |
| 271 | u_int8_t proto, const __be16 *src, const __be16 *dst) |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 272 | { |
| 273 | int len; |
| 274 | |
| 275 | if (family == AF_INET) |
| 276 | len = 4; |
| 277 | else |
| 278 | len = 16; |
| 279 | |
| 280 | exp->flags = 0; |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 281 | exp->class = class; |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 282 | exp->expectfn = NULL; |
| 283 | exp->helper = NULL; |
| 284 | exp->tuple.src.l3num = family; |
| 285 | exp->tuple.dst.protonum = proto; |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 286 | |
| 287 | if (saddr) { |
| 288 | memcpy(&exp->tuple.src.u3, saddr, len); |
| 289 | if (sizeof(exp->tuple.src.u3) > len) |
| 290 | /* address needs to be cleared for nf_ct_tuple_equal */ |
| 291 | memset((void *)&exp->tuple.src.u3 + len, 0x00, |
| 292 | sizeof(exp->tuple.src.u3) - len); |
| 293 | memset(&exp->mask.src.u3, 0xFF, len); |
| 294 | if (sizeof(exp->mask.src.u3) > len) |
| 295 | memset((void *)&exp->mask.src.u3 + len, 0x00, |
| 296 | sizeof(exp->mask.src.u3) - len); |
| 297 | } else { |
| 298 | memset(&exp->tuple.src.u3, 0x00, sizeof(exp->tuple.src.u3)); |
| 299 | memset(&exp->mask.src.u3, 0x00, sizeof(exp->mask.src.u3)); |
| 300 | } |
| 301 | |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 302 | if (src) { |
Al Viro | a34c458 | 2007-07-26 17:33:19 +0100 | [diff] [blame] | 303 | exp->tuple.src.u.all = *src; |
| 304 | exp->mask.src.u.all = htons(0xFFFF); |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 305 | } else { |
| 306 | exp->tuple.src.u.all = 0; |
| 307 | exp->mask.src.u.all = 0; |
| 308 | } |
| 309 | |
Patrick McHardy | d4156e8 | 2007-07-07 22:31:32 -0700 | [diff] [blame] | 310 | memcpy(&exp->tuple.dst.u3, daddr, len); |
| 311 | if (sizeof(exp->tuple.dst.u3) > len) |
| 312 | /* address needs to be cleared for nf_ct_tuple_equal */ |
| 313 | memset((void *)&exp->tuple.dst.u3 + len, 0x00, |
| 314 | sizeof(exp->tuple.dst.u3) - len); |
| 315 | |
Al Viro | a34c458 | 2007-07-26 17:33:19 +0100 | [diff] [blame] | 316 | exp->tuple.dst.u.all = *dst; |
Pablo Neira Ayuso | f09eca8 | 2013-07-09 20:16:39 +0200 | [diff] [blame] | 317 | |
| 318 | #ifdef CONFIG_NF_NAT_NEEDED |
| 319 | memset(&exp->saved_addr, 0, sizeof(exp->saved_addr)); |
| 320 | memset(&exp->saved_proto, 0, sizeof(exp->saved_proto)); |
| 321 | #endif |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 322 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 323 | EXPORT_SYMBOL_GPL(nf_ct_expect_init); |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 324 | |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 325 | static void nf_ct_expect_free_rcu(struct rcu_head *head) |
| 326 | { |
| 327 | struct nf_conntrack_expect *exp; |
| 328 | |
| 329 | exp = container_of(head, struct nf_conntrack_expect, rcu); |
| 330 | kmem_cache_free(nf_ct_expect_cachep, exp); |
| 331 | } |
| 332 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 333 | void nf_ct_expect_put(struct nf_conntrack_expect *exp) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 334 | { |
| 335 | if (atomic_dec_and_test(&exp->use)) |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 336 | call_rcu(&exp->rcu, nf_ct_expect_free_rcu); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 337 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 338 | EXPORT_SYMBOL_GPL(nf_ct_expect_put); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 339 | |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 340 | static int nf_ct_expect_insert(struct nf_conntrack_expect *exp) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 341 | { |
| 342 | struct nf_conn_help *master_help = nfct_help(exp->master); |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 343 | struct nf_conntrack_helper *helper; |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 344 | struct net *net = nf_ct_exp_net(exp); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 345 | unsigned int h = nf_ct_expect_dst_hash(&exp->tuple); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 346 | |
Eric Dumazet | 3bfd45f | 2010-11-16 10:19:18 +0100 | [diff] [blame] | 347 | /* two references : one for hash insert, one for the timer */ |
| 348 | atomic_add(2, &exp->use); |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 349 | |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 350 | hlist_add_head(&exp->lnode, &master_help->expectations); |
| 351 | master_help->expecting[exp->class]++; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 352 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 353 | hlist_add_head_rcu(&exp->hnode, &net->ct.expect_hash[h]); |
| 354 | net->ct.expect_count++; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 355 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 356 | setup_timer(&exp->timeout, nf_ct_expectation_timed_out, |
| 357 | (unsigned long)exp); |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 358 | helper = rcu_dereference_protected(master_help->helper, |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 359 | lockdep_is_held(&nf_conntrack_expect_lock)); |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 360 | if (helper) { |
| 361 | exp->timeout.expires = jiffies + |
| 362 | helper->expect_policy[exp->class].timeout * HZ; |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 363 | } |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 364 | add_timer(&exp->timeout); |
| 365 | |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 366 | NF_CT_STAT_INC(net, expect_create); |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 367 | return 0; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 368 | } |
| 369 | |
| 370 | /* 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] | 371 | static void evict_oldest_expect(struct nf_conn *master, |
| 372 | struct nf_conntrack_expect *new) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 373 | { |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 374 | struct nf_conn_help *master_help = nfct_help(master); |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 375 | struct nf_conntrack_expect *exp, *last = NULL; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 376 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 377 | hlist_for_each_entry(exp, &master_help->expectations, lnode) { |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 378 | if (exp->class == new->class) |
| 379 | last = exp; |
| 380 | } |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 381 | |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 382 | if (last && del_timer(&last->timeout)) { |
| 383 | nf_ct_unlink_expect(last); |
| 384 | nf_ct_expect_put(last); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 385 | } |
| 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); |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 394 | struct nf_conntrack_helper *helper; |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 395 | struct net *net = nf_ct_exp_net(expect); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 396 | struct hlist_node *next; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 397 | unsigned int h; |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 398 | int ret = 1; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 399 | |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 400 | if (!master_help) { |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 401 | ret = -ESHUTDOWN; |
| 402 | goto out; |
| 403 | } |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 404 | h = nf_ct_expect_dst_hash(&expect->tuple); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 405 | hlist_for_each_entry_safe(i, next, &net->ct.expect_hash[h], hnode) { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 406 | if (expect_matches(i, expect)) { |
Pablo Neira Ayuso | 2614f86 | 2012-08-16 02:25:24 +0200 | [diff] [blame] | 407 | if (del_timer(&i->timeout)) { |
| 408 | nf_ct_unlink_expect(i); |
| 409 | nf_ct_expect_put(i); |
| 410 | break; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 411 | } |
| 412 | } else if (expect_clash(i, expect)) { |
| 413 | ret = -EBUSY; |
| 414 | goto out; |
| 415 | } |
| 416 | } |
| 417 | /* Will be over limit? */ |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 418 | helper = rcu_dereference_protected(master_help->helper, |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 419 | lockdep_is_held(&nf_conntrack_expect_lock)); |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 420 | if (helper) { |
| 421 | p = &helper->expect_policy[expect->class]; |
Pablo Neira Ayuso | bc01befd | 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 | 6002f266 | 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) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 434 | net_warn_ratelimited("nf_conntrack: expectation table full\n"); |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 435 | ret = -EMFILE; |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 436 | } |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 437 | out: |
| 438 | return ret; |
| 439 | } |
| 440 | |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame] | 441 | int nf_ct_expect_related_report(struct nf_conntrack_expect *expect, |
Patrick McHardy | ec464e5 | 2013-04-17 06:47:08 +0000 | [diff] [blame] | 442 | u32 portid, int report) |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 443 | { |
| 444 | int ret; |
| 445 | |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 446 | spin_lock_bh(&nf_conntrack_expect_lock); |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 447 | ret = __nf_ct_expect_check(expect); |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 448 | if (ret <= 0) |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 449 | goto out; |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 450 | |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 451 | ret = nf_ct_expect_insert(expect); |
| 452 | if (ret < 0) |
| 453 | goto out; |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 454 | spin_unlock_bh(&nf_conntrack_expect_lock); |
Patrick McHardy | ec464e5 | 2013-04-17 06:47:08 +0000 | [diff] [blame] | 455 | nf_ct_expect_event_report(IPEXP_NEW, expect, portid, report); |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 456 | return ret; |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 457 | out: |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 458 | spin_unlock_bh(&nf_conntrack_expect_lock); |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 459 | return ret; |
| 460 | } |
| 461 | EXPORT_SYMBOL_GPL(nf_ct_expect_related_report); |
| 462 | |
Jan Engelhardt | 54b07dc | 2011-04-21 09:32:45 +0200 | [diff] [blame] | 463 | #ifdef CONFIG_NF_CONNTRACK_PROCFS |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 464 | struct ct_expect_iter_state { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 465 | struct seq_net_private p; |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 466 | unsigned int bucket; |
| 467 | }; |
| 468 | |
| 469 | static struct hlist_node *ct_expect_get_first(struct seq_file *seq) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 470 | { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 471 | struct net *net = seq_file_net(seq); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 472 | struct ct_expect_iter_state *st = seq->private; |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 473 | struct hlist_node *n; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 474 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 475 | for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) { |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 476 | n = rcu_dereference(hlist_first_rcu(&net->ct.expect_hash[st->bucket])); |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 477 | if (n) |
| 478 | return n; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 479 | } |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 480 | return NULL; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 481 | } |
| 482 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 483 | static struct hlist_node *ct_expect_get_next(struct seq_file *seq, |
| 484 | struct hlist_node *head) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 485 | { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 486 | struct net *net = seq_file_net(seq); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 487 | struct ct_expect_iter_state *st = seq->private; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 488 | |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 489 | head = rcu_dereference(hlist_next_rcu(head)); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 490 | while (head == NULL) { |
| 491 | if (++st->bucket >= nf_ct_expect_hsize) |
| 492 | return NULL; |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 493 | head = rcu_dereference(hlist_first_rcu(&net->ct.expect_hash[st->bucket])); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 494 | } |
| 495 | return head; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 496 | } |
| 497 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 498 | static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos) |
| 499 | { |
| 500 | struct hlist_node *head = ct_expect_get_first(seq); |
| 501 | |
| 502 | if (head) |
| 503 | while (pos && (head = ct_expect_get_next(seq, head))) |
| 504 | pos--; |
| 505 | return pos ? NULL : head; |
| 506 | } |
| 507 | |
| 508 | static void *exp_seq_start(struct seq_file *seq, loff_t *pos) |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 509 | __acquires(RCU) |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 510 | { |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 511 | rcu_read_lock(); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 512 | return ct_expect_get_idx(seq, *pos); |
| 513 | } |
| 514 | |
| 515 | static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 516 | { |
| 517 | (*pos)++; |
| 518 | return ct_expect_get_next(seq, v); |
| 519 | } |
| 520 | |
| 521 | static void exp_seq_stop(struct seq_file *seq, void *v) |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 522 | __releases(RCU) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 523 | { |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 524 | rcu_read_unlock(); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 525 | } |
| 526 | |
| 527 | static int exp_seq_show(struct seq_file *s, void *v) |
| 528 | { |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 529 | struct nf_conntrack_expect *expect; |
Patrick McHardy | b87921b | 2010-02-11 12:22:48 +0100 | [diff] [blame] | 530 | struct nf_conntrack_helper *helper; |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 531 | struct hlist_node *n = v; |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 532 | char *delim = ""; |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 533 | |
| 534 | expect = hlist_entry(n, struct nf_conntrack_expect, hnode); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 535 | |
| 536 | if (expect->timeout.function) |
| 537 | seq_printf(s, "%ld ", timer_pending(&expect->timeout) |
| 538 | ? (long)(expect->timeout.expires - jiffies)/HZ : 0); |
| 539 | else |
| 540 | seq_printf(s, "- "); |
| 541 | seq_printf(s, "l3proto = %u proto=%u ", |
| 542 | expect->tuple.src.l3num, |
| 543 | expect->tuple.dst.protonum); |
| 544 | print_tuple(s, &expect->tuple, |
| 545 | __nf_ct_l3proto_find(expect->tuple.src.l3num), |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 546 | __nf_ct_l4proto_find(expect->tuple.src.l3num, |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 547 | expect->tuple.dst.protonum)); |
Patrick McHardy | 4bb119e | 2008-03-25 20:08:17 -0700 | [diff] [blame] | 548 | |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 549 | if (expect->flags & NF_CT_EXPECT_PERMANENT) { |
| 550 | seq_printf(s, "PERMANENT"); |
| 551 | delim = ","; |
| 552 | } |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 553 | if (expect->flags & NF_CT_EXPECT_INACTIVE) { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 554 | seq_printf(s, "%sINACTIVE", delim); |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 555 | delim = ","; |
| 556 | } |
| 557 | if (expect->flags & NF_CT_EXPECT_USERSPACE) |
| 558 | seq_printf(s, "%sUSERSPACE", delim); |
Patrick McHardy | 4bb119e | 2008-03-25 20:08:17 -0700 | [diff] [blame] | 559 | |
Patrick McHardy | b87921b | 2010-02-11 12:22:48 +0100 | [diff] [blame] | 560 | helper = rcu_dereference(nfct_help(expect->master)->helper); |
| 561 | if (helper) { |
| 562 | seq_printf(s, "%s%s", expect->flags ? " " : "", helper->name); |
| 563 | if (helper->expect_policy[expect->class].name) |
| 564 | seq_printf(s, "/%s", |
| 565 | helper->expect_policy[expect->class].name); |
| 566 | } |
| 567 | |
Joe Perches | 1ca9e41 | 2015-03-16 11:25:17 -0700 | [diff] [blame] | 568 | seq_putc(s, '\n'); |
| 569 | |
| 570 | return 0; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 571 | } |
| 572 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 573 | static const struct seq_operations exp_seq_ops = { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 574 | .start = exp_seq_start, |
| 575 | .next = exp_seq_next, |
| 576 | .stop = exp_seq_stop, |
| 577 | .show = exp_seq_show |
| 578 | }; |
| 579 | |
| 580 | static int exp_open(struct inode *inode, struct file *file) |
| 581 | { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 582 | return seq_open_net(inode, file, &exp_seq_ops, |
Pavel Emelyanov | e2da591 | 2007-10-10 02:29:58 -0700 | [diff] [blame] | 583 | sizeof(struct ct_expect_iter_state)); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 584 | } |
| 585 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 586 | static const struct file_operations exp_file_ops = { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 587 | .owner = THIS_MODULE, |
| 588 | .open = exp_open, |
| 589 | .read = seq_read, |
| 590 | .llseek = seq_lseek, |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 591 | .release = seq_release_net, |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 592 | }; |
Jan Engelhardt | 54b07dc | 2011-04-21 09:32:45 +0200 | [diff] [blame] | 593 | #endif /* CONFIG_NF_CONNTRACK_PROCFS */ |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 594 | |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 595 | static int exp_proc_init(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 596 | { |
Jan Engelhardt | 54b07dc | 2011-04-21 09:32:45 +0200 | [diff] [blame] | 597 | #ifdef CONFIG_NF_CONNTRACK_PROCFS |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 598 | struct proc_dir_entry *proc; |
Philip Whineray | f13f2ae | 2015-11-22 11:35:07 +0000 | [diff] [blame] | 599 | kuid_t root_uid; |
| 600 | kgid_t root_gid; |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 601 | |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 602 | proc = proc_create("nf_conntrack_expect", 0440, net->proc_net, |
| 603 | &exp_file_ops); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 604 | if (!proc) |
| 605 | return -ENOMEM; |
Philip Whineray | f13f2ae | 2015-11-22 11:35:07 +0000 | [diff] [blame] | 606 | |
| 607 | root_uid = make_kuid(net->user_ns, 0); |
| 608 | root_gid = make_kgid(net->user_ns, 0); |
| 609 | if (uid_valid(root_uid) && gid_valid(root_gid)) |
| 610 | proc_set_user(proc, root_uid, root_gid); |
Jan Engelhardt | 54b07dc | 2011-04-21 09:32:45 +0200 | [diff] [blame] | 611 | #endif /* CONFIG_NF_CONNTRACK_PROCFS */ |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 612 | return 0; |
| 613 | } |
| 614 | |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 615 | static void exp_proc_remove(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 616 | { |
Jan Engelhardt | 54b07dc | 2011-04-21 09:32:45 +0200 | [diff] [blame] | 617 | #ifdef CONFIG_NF_CONNTRACK_PROCFS |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 618 | remove_proc_entry("nf_conntrack_expect", net->proc_net); |
Jan Engelhardt | 54b07dc | 2011-04-21 09:32:45 +0200 | [diff] [blame] | 619 | #endif /* CONFIG_NF_CONNTRACK_PROCFS */ |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 620 | } |
| 621 | |
Alexey Dobriyan | 13ccdfc | 2010-02-08 11:17:22 -0800 | [diff] [blame] | 622 | module_param_named(expect_hashsize, nf_ct_expect_hsize, uint, 0400); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 623 | |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 624 | int nf_conntrack_expect_pernet_init(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 625 | { |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 626 | int err = -ENOMEM; |
| 627 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 628 | net->ct.expect_count = 0; |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 629 | 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] | 630 | if (net->ct.expect_hash == NULL) |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 631 | goto err1; |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 632 | |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 633 | err = exp_proc_init(net); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 634 | if (err < 0) |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 635 | goto err2; |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 636 | |
| 637 | return 0; |
Alexey Dobriyan | 12293bf | 2008-05-29 03:19:37 -0700 | [diff] [blame] | 638 | err2: |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 639 | nf_ct_free_hashtable(net->ct.expect_hash, nf_ct_expect_hsize); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 640 | err1: |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 641 | return err; |
| 642 | } |
| 643 | |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 644 | void nf_conntrack_expect_pernet_fini(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 645 | { |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 646 | exp_proc_remove(net); |
Patrick McHardy | d862a66 | 2011-01-14 15:45:56 +0100 | [diff] [blame] | 647 | nf_ct_free_hashtable(net->ct.expect_hash, nf_ct_expect_hsize); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 648 | } |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 649 | |
| 650 | int nf_conntrack_expect_init(void) |
| 651 | { |
| 652 | if (!nf_ct_expect_hsize) { |
| 653 | nf_ct_expect_hsize = nf_conntrack_htable_size / 256; |
| 654 | if (!nf_ct_expect_hsize) |
| 655 | nf_ct_expect_hsize = 1; |
| 656 | } |
| 657 | nf_ct_expect_max = nf_ct_expect_hsize * 4; |
| 658 | nf_ct_expect_cachep = kmem_cache_create("nf_conntrack_expect", |
| 659 | sizeof(struct nf_conntrack_expect), |
| 660 | 0, 0, NULL); |
| 661 | if (!nf_ct_expect_cachep) |
| 662 | return -ENOMEM; |
| 663 | return 0; |
| 664 | } |
| 665 | |
| 666 | void nf_conntrack_expect_fini(void) |
| 667 | { |
| 668 | rcu_barrier(); /* Wait for call_rcu() before destroy */ |
| 669 | kmem_cache_destroy(nf_ct_expect_cachep); |
| 670 | } |