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> |
Florian Westphal | a9a083c | 2016-05-06 00:51:48 +0200 | [diff] [blame] | 27 | #include <net/netns/hash.h> |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 28 | |
| 29 | #include <net/netfilter/nf_conntrack.h> |
| 30 | #include <net/netfilter/nf_conntrack_core.h> |
| 31 | #include <net/netfilter/nf_conntrack_expect.h> |
| 32 | #include <net/netfilter/nf_conntrack_helper.h> |
| 33 | #include <net/netfilter/nf_conntrack_tuple.h> |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 34 | #include <net/netfilter/nf_conntrack_zones.h> |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 35 | |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 36 | unsigned int nf_ct_expect_hsize __read_mostly; |
| 37 | EXPORT_SYMBOL_GPL(nf_ct_expect_hsize); |
| 38 | |
Florian Westphal | 0a93aae | 2016-05-06 00:51:49 +0200 | [diff] [blame] | 39 | struct hlist_head *nf_ct_expect_hash __read_mostly; |
| 40 | EXPORT_SYMBOL_GPL(nf_ct_expect_hash); |
| 41 | |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 42 | unsigned int nf_ct_expect_max __read_mostly; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 43 | |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 44 | static struct kmem_cache *nf_ct_expect_cachep __read_mostly; |
Florian Westphal | 7001c6d | 2016-04-18 16:17:00 +0200 | [diff] [blame] | 45 | static unsigned int nf_ct_expect_hashrnd __read_mostly; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 46 | |
| 47 | /* nf_conntrack_expect helper functions */ |
Pablo Neira Ayuso | ebbf41d | 2010-10-19 10:19:06 +0200 | [diff] [blame] | 48 | void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp, |
Patrick McHardy | ec464e5 | 2013-04-17 06:47:08 +0000 | [diff] [blame] | 49 | u32 portid, int report) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 50 | { |
| 51 | struct nf_conn_help *master_help = nfct_help(exp->master); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 52 | struct net *net = nf_ct_exp_net(exp); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 53 | |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 54 | NF_CT_ASSERT(master_help); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 55 | NF_CT_ASSERT(!timer_pending(&exp->timeout)); |
| 56 | |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 57 | hlist_del_rcu(&exp->hnode); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 58 | net->ct.expect_count--; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 59 | |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 60 | hlist_del(&exp->lnode); |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 61 | master_help->expecting[exp->class]--; |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 62 | |
Patrick McHardy | ec464e5 | 2013-04-17 06:47:08 +0000 | [diff] [blame] | 63 | nf_ct_expect_event_report(IPEXP_DESTROY, exp, portid, report); |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 64 | nf_ct_expect_put(exp); |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 65 | |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 66 | NF_CT_STAT_INC(net, expect_delete); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 67 | } |
Pablo Neira Ayuso | ebbf41d | 2010-10-19 10:19:06 +0200 | [diff] [blame] | 68 | EXPORT_SYMBOL_GPL(nf_ct_unlink_expect_report); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 69 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 70 | static void nf_ct_expectation_timed_out(unsigned long ul_expect) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 71 | { |
| 72 | struct nf_conntrack_expect *exp = (void *)ul_expect; |
| 73 | |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 74 | spin_lock_bh(&nf_conntrack_expect_lock); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 75 | nf_ct_unlink_expect(exp); |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 76 | spin_unlock_bh(&nf_conntrack_expect_lock); |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 77 | nf_ct_expect_put(exp); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 78 | } |
| 79 | |
Florian Westphal | a9a083c | 2016-05-06 00:51:48 +0200 | [diff] [blame] | 80 | static unsigned int nf_ct_expect_dst_hash(const struct net *n, const struct nf_conntrack_tuple *tuple) |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 81 | { |
Florian Westphal | a9a083c | 2016-05-06 00:51:48 +0200 | [diff] [blame] | 82 | unsigned int hash, seed; |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 83 | |
Florian Westphal | 7001c6d | 2016-04-18 16:17:00 +0200 | [diff] [blame] | 84 | get_random_once(&nf_ct_expect_hashrnd, sizeof(nf_ct_expect_hashrnd)); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 85 | |
Florian Westphal | a9a083c | 2016-05-06 00:51:48 +0200 | [diff] [blame] | 86 | seed = nf_ct_expect_hashrnd ^ net_hash_mix(n); |
| 87 | |
Patrick McHardy | 3449882 | 2007-12-17 22:45:52 -0800 | [diff] [blame] | 88 | hash = jhash2(tuple->dst.u3.all, ARRAY_SIZE(tuple->dst.u3.all), |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 89 | (((tuple->dst.protonum ^ tuple->src.l3num) << 16) | |
Florian Westphal | a9a083c | 2016-05-06 00:51:48 +0200 | [diff] [blame] | 90 | (__force __u16)tuple->dst.u.all) ^ seed); |
Daniel Borkmann | 8fc54f6 | 2014-08-23 20:58:54 +0200 | [diff] [blame] | 91 | |
| 92 | return reciprocal_scale(hash, nf_ct_expect_hsize); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 93 | } |
| 94 | |
Florian Westphal | 03d7dc5 | 2016-05-06 00:51:47 +0200 | [diff] [blame] | 95 | static bool |
| 96 | nf_ct_exp_equal(const struct nf_conntrack_tuple *tuple, |
| 97 | const struct nf_conntrack_expect *i, |
| 98 | const struct nf_conntrack_zone *zone, |
| 99 | const struct net *net) |
| 100 | { |
| 101 | return nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask) && |
| 102 | net_eq(net, nf_ct_net(i->master)) && |
| 103 | nf_ct_zone_equal_any(i->master, zone); |
| 104 | } |
| 105 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 106 | struct nf_conntrack_expect * |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 107 | __nf_ct_expect_find(struct net *net, |
| 108 | const struct nf_conntrack_zone *zone, |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 109 | const struct nf_conntrack_tuple *tuple) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 110 | { |
| 111 | struct nf_conntrack_expect *i; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 112 | unsigned int h; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 113 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 114 | if (!net->ct.expect_count) |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 115 | return NULL; |
| 116 | |
Florian Westphal | a9a083c | 2016-05-06 00:51:48 +0200 | [diff] [blame] | 117 | h = nf_ct_expect_dst_hash(net, tuple); |
Florian Westphal | 0a93aae | 2016-05-06 00:51:49 +0200 | [diff] [blame] | 118 | hlist_for_each_entry_rcu(i, &nf_ct_expect_hash[h], hnode) { |
Florian Westphal | 03d7dc5 | 2016-05-06 00:51:47 +0200 | [diff] [blame] | 119 | if (nf_ct_exp_equal(tuple, i, zone, net)) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 120 | return i; |
| 121 | } |
| 122 | return NULL; |
| 123 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 124 | EXPORT_SYMBOL_GPL(__nf_ct_expect_find); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 125 | |
| 126 | /* Just find a expectation corresponding to a tuple. */ |
| 127 | struct nf_conntrack_expect * |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 128 | nf_ct_expect_find_get(struct net *net, |
| 129 | const struct nf_conntrack_zone *zone, |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 130 | const struct nf_conntrack_tuple *tuple) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 131 | { |
| 132 | struct nf_conntrack_expect *i; |
| 133 | |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 134 | rcu_read_lock(); |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 135 | i = __nf_ct_expect_find(net, zone, tuple); |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 136 | if (i && !atomic_inc_not_zero(&i->use)) |
| 137 | i = NULL; |
| 138 | rcu_read_unlock(); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 139 | |
| 140 | return i; |
| 141 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 142 | EXPORT_SYMBOL_GPL(nf_ct_expect_find_get); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 143 | |
| 144 | /* If an expectation for this connection is found, it gets delete from |
| 145 | * global list then returned. */ |
| 146 | struct nf_conntrack_expect * |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 147 | nf_ct_find_expectation(struct net *net, |
| 148 | const struct nf_conntrack_zone *zone, |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 149 | const struct nf_conntrack_tuple *tuple) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 150 | { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 151 | struct nf_conntrack_expect *i, *exp = NULL; |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 152 | unsigned int h; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 153 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 154 | if (!net->ct.expect_count) |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 155 | return NULL; |
| 156 | |
Florian Westphal | a9a083c | 2016-05-06 00:51:48 +0200 | [diff] [blame] | 157 | h = nf_ct_expect_dst_hash(net, tuple); |
Florian Westphal | 0a93aae | 2016-05-06 00:51:49 +0200 | [diff] [blame] | 158 | hlist_for_each_entry(i, &nf_ct_expect_hash[h], hnode) { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 159 | if (!(i->flags & NF_CT_EXPECT_INACTIVE) && |
Florian Westphal | 03d7dc5 | 2016-05-06 00:51:47 +0200 | [diff] [blame] | 160 | nf_ct_exp_equal(tuple, i, zone, net)) { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 161 | exp = i; |
| 162 | break; |
| 163 | } |
| 164 | } |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 165 | if (!exp) |
| 166 | return NULL; |
| 167 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 168 | /* If master is not in hash table yet (ie. packet hasn't left |
| 169 | this machine yet), how can other end know about expected? |
| 170 | Hence these are not the droids you are looking for (if |
| 171 | master ct never got confirmed, we'd hold a reference to it |
| 172 | and weird things would happen to future packets). */ |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 173 | if (!nf_ct_is_confirmed(exp->master)) |
| 174 | return NULL; |
| 175 | |
Jesper Dangaard Brouer | e1b207d | 2014-03-03 14:45:39 +0100 | [diff] [blame] | 176 | /* Avoid race with other CPUs, that for exp->master ct, is |
| 177 | * about to invoke ->destroy(), or nf_ct_delete() via timeout |
| 178 | * or early_drop(). |
| 179 | * |
| 180 | * The atomic_inc_not_zero() check tells: If that fails, we |
| 181 | * know that the ct is being destroyed. If it succeeds, we |
| 182 | * can be sure the ct cannot disappear underneath. |
| 183 | */ |
| 184 | if (unlikely(nf_ct_is_dying(exp->master) || |
| 185 | !atomic_inc_not_zero(&exp->master->ct_general.use))) |
| 186 | return NULL; |
| 187 | |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 188 | if (exp->flags & NF_CT_EXPECT_PERMANENT) { |
| 189 | atomic_inc(&exp->use); |
| 190 | return exp; |
| 191 | } else if (del_timer(&exp->timeout)) { |
| 192 | nf_ct_unlink_expect(exp); |
| 193 | return exp; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 194 | } |
Jesper Dangaard Brouer | e1b207d | 2014-03-03 14:45:39 +0100 | [diff] [blame] | 195 | /* Undo exp->master refcnt increase, if del_timer() failed */ |
| 196 | nf_ct_put(exp->master); |
Yasuyuki Kozakai | ece0064 | 2006-12-05 13:44:57 -0800 | [diff] [blame] | 197 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 198 | return NULL; |
| 199 | } |
| 200 | |
| 201 | /* delete all expectations for this conntrack */ |
| 202 | void nf_ct_remove_expectations(struct nf_conn *ct) |
| 203 | { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 204 | struct nf_conn_help *help = nfct_help(ct); |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 205 | struct nf_conntrack_expect *exp; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 206 | struct hlist_node *next; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 207 | |
| 208 | /* Optimization: most connection never expect any others. */ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 209 | if (!help) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 210 | return; |
| 211 | |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 212 | spin_lock_bh(&nf_conntrack_expect_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 213 | hlist_for_each_entry_safe(exp, next, &help->expectations, lnode) { |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 214 | if (del_timer(&exp->timeout)) { |
| 215 | nf_ct_unlink_expect(exp); |
| 216 | nf_ct_expect_put(exp); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 217 | } |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 218 | } |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 219 | spin_unlock_bh(&nf_conntrack_expect_lock); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 220 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 221 | EXPORT_SYMBOL_GPL(nf_ct_remove_expectations); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 222 | |
| 223 | /* Would two expected things clash? */ |
| 224 | static inline int expect_clash(const struct nf_conntrack_expect *a, |
| 225 | const struct nf_conntrack_expect *b) |
| 226 | { |
| 227 | /* Part covered by intersection of masks must be unequal, |
| 228 | otherwise they clash */ |
Patrick McHardy | d4156e8 | 2007-07-07 22:31:32 -0700 | [diff] [blame] | 229 | struct nf_conntrack_tuple_mask intersect_mask; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 230 | int count; |
| 231 | |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 232 | 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] | 233 | |
| 234 | for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){ |
| 235 | intersect_mask.src.u3.all[count] = |
| 236 | a->mask.src.u3.all[count] & b->mask.src.u3.all[count]; |
| 237 | } |
| 238 | |
Joe Stringer | 4b31814 | 2015-07-21 21:37:31 -0700 | [diff] [blame] | 239 | return nf_ct_tuple_mask_cmp(&a->tuple, &b->tuple, &intersect_mask) && |
Florian Westphal | 03d7dc5 | 2016-05-06 00:51:47 +0200 | [diff] [blame] | 240 | net_eq(nf_ct_net(a->master), nf_ct_net(b->master)) && |
Daniel Borkmann | deedb59 | 2015-08-14 16:03:39 +0200 | [diff] [blame] | 241 | nf_ct_zone_equal_any(a->master, nf_ct_zone(b->master)); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 242 | } |
| 243 | |
| 244 | static inline int expect_matches(const struct nf_conntrack_expect *a, |
| 245 | const struct nf_conntrack_expect *b) |
| 246 | { |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 247 | return a->master == b->master && a->class == b->class && |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 248 | nf_ct_tuple_equal(&a->tuple, &b->tuple) && |
| 249 | nf_ct_tuple_mask_equal(&a->mask, &b->mask) && |
Florian Westphal | 03d7dc5 | 2016-05-06 00:51:47 +0200 | [diff] [blame] | 250 | net_eq(nf_ct_net(a->master), nf_ct_net(b->master)) && |
Daniel Borkmann | deedb59 | 2015-08-14 16:03:39 +0200 | [diff] [blame] | 251 | nf_ct_zone_equal_any(a->master, nf_ct_zone(b->master)); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | /* Generally a bad idea to call this: could have matched already. */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 255 | void nf_ct_unexpect_related(struct nf_conntrack_expect *exp) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 256 | { |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 257 | spin_lock_bh(&nf_conntrack_expect_lock); |
Patrick McHardy | 4e1d4e6 | 2007-07-07 22:32:03 -0700 | [diff] [blame] | 258 | if (del_timer(&exp->timeout)) { |
| 259 | nf_ct_unlink_expect(exp); |
| 260 | nf_ct_expect_put(exp); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 261 | } |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 262 | spin_unlock_bh(&nf_conntrack_expect_lock); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 263 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 264 | EXPORT_SYMBOL_GPL(nf_ct_unexpect_related); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 265 | |
| 266 | /* We don't increase the master conntrack refcount for non-fulfilled |
| 267 | * conntracks. During the conntrack destruction, the expectations are |
| 268 | * always killed before the conntrack itself */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 269 | struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 270 | { |
| 271 | struct nf_conntrack_expect *new; |
| 272 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 273 | new = kmem_cache_alloc(nf_ct_expect_cachep, GFP_ATOMIC); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 274 | if (!new) |
| 275 | return NULL; |
| 276 | |
| 277 | new->master = me; |
| 278 | atomic_set(&new->use, 1); |
| 279 | return new; |
| 280 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 281 | EXPORT_SYMBOL_GPL(nf_ct_expect_alloc); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 282 | |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 283 | 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] | 284 | u_int8_t family, |
Patrick McHardy | 1d9d752 | 2008-03-25 20:07:58 -0700 | [diff] [blame] | 285 | const union nf_inet_addr *saddr, |
| 286 | const union nf_inet_addr *daddr, |
| 287 | u_int8_t proto, const __be16 *src, const __be16 *dst) |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 288 | { |
| 289 | int len; |
| 290 | |
| 291 | if (family == AF_INET) |
| 292 | len = 4; |
| 293 | else |
| 294 | len = 16; |
| 295 | |
| 296 | exp->flags = 0; |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 297 | exp->class = class; |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 298 | exp->expectfn = NULL; |
| 299 | exp->helper = NULL; |
| 300 | exp->tuple.src.l3num = family; |
| 301 | exp->tuple.dst.protonum = proto; |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 302 | |
| 303 | if (saddr) { |
| 304 | memcpy(&exp->tuple.src.u3, saddr, len); |
| 305 | if (sizeof(exp->tuple.src.u3) > len) |
| 306 | /* address needs to be cleared for nf_ct_tuple_equal */ |
| 307 | memset((void *)&exp->tuple.src.u3 + len, 0x00, |
| 308 | sizeof(exp->tuple.src.u3) - len); |
| 309 | memset(&exp->mask.src.u3, 0xFF, len); |
| 310 | if (sizeof(exp->mask.src.u3) > len) |
| 311 | memset((void *)&exp->mask.src.u3 + len, 0x00, |
| 312 | sizeof(exp->mask.src.u3) - len); |
| 313 | } else { |
| 314 | memset(&exp->tuple.src.u3, 0x00, sizeof(exp->tuple.src.u3)); |
| 315 | memset(&exp->mask.src.u3, 0x00, sizeof(exp->mask.src.u3)); |
| 316 | } |
| 317 | |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 318 | if (src) { |
Al Viro | a34c458 | 2007-07-26 17:33:19 +0100 | [diff] [blame] | 319 | exp->tuple.src.u.all = *src; |
| 320 | exp->mask.src.u.all = htons(0xFFFF); |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 321 | } else { |
| 322 | exp->tuple.src.u.all = 0; |
| 323 | exp->mask.src.u.all = 0; |
| 324 | } |
| 325 | |
Patrick McHardy | d4156e8 | 2007-07-07 22:31:32 -0700 | [diff] [blame] | 326 | memcpy(&exp->tuple.dst.u3, daddr, len); |
| 327 | if (sizeof(exp->tuple.dst.u3) > len) |
| 328 | /* address needs to be cleared for nf_ct_tuple_equal */ |
| 329 | memset((void *)&exp->tuple.dst.u3 + len, 0x00, |
| 330 | sizeof(exp->tuple.dst.u3) - len); |
| 331 | |
Al Viro | a34c458 | 2007-07-26 17:33:19 +0100 | [diff] [blame] | 332 | exp->tuple.dst.u.all = *dst; |
Pablo Neira Ayuso | f09eca8 | 2013-07-09 20:16:39 +0200 | [diff] [blame] | 333 | |
| 334 | #ifdef CONFIG_NF_NAT_NEEDED |
| 335 | memset(&exp->saved_addr, 0, sizeof(exp->saved_addr)); |
| 336 | memset(&exp->saved_proto, 0, sizeof(exp->saved_proto)); |
| 337 | #endif |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 338 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 339 | EXPORT_SYMBOL_GPL(nf_ct_expect_init); |
Patrick McHardy | d6a9b65 | 2006-12-02 22:08:01 -0800 | [diff] [blame] | 340 | |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 341 | static void nf_ct_expect_free_rcu(struct rcu_head *head) |
| 342 | { |
| 343 | struct nf_conntrack_expect *exp; |
| 344 | |
| 345 | exp = container_of(head, struct nf_conntrack_expect, rcu); |
| 346 | kmem_cache_free(nf_ct_expect_cachep, exp); |
| 347 | } |
| 348 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 349 | void nf_ct_expect_put(struct nf_conntrack_expect *exp) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 350 | { |
| 351 | if (atomic_dec_and_test(&exp->use)) |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 352 | call_rcu(&exp->rcu, nf_ct_expect_free_rcu); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 353 | } |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 354 | EXPORT_SYMBOL_GPL(nf_ct_expect_put); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 355 | |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 356 | static int nf_ct_expect_insert(struct nf_conntrack_expect *exp) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 357 | { |
| 358 | struct nf_conn_help *master_help = nfct_help(exp->master); |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 359 | struct nf_conntrack_helper *helper; |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 360 | struct net *net = nf_ct_exp_net(exp); |
Florian Westphal | a9a083c | 2016-05-06 00:51:48 +0200 | [diff] [blame] | 361 | unsigned int h = nf_ct_expect_dst_hash(net, &exp->tuple); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 362 | |
Eric Dumazet | 3bfd45f | 2010-11-16 10:19:18 +0100 | [diff] [blame] | 363 | /* two references : one for hash insert, one for the timer */ |
| 364 | atomic_add(2, &exp->use); |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 365 | |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 366 | hlist_add_head(&exp->lnode, &master_help->expectations); |
| 367 | master_help->expecting[exp->class]++; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 368 | |
Florian Westphal | 0a93aae | 2016-05-06 00:51:49 +0200 | [diff] [blame] | 369 | hlist_add_head_rcu(&exp->hnode, &nf_ct_expect_hash[h]); |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 370 | net->ct.expect_count++; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 371 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 372 | setup_timer(&exp->timeout, nf_ct_expectation_timed_out, |
| 373 | (unsigned long)exp); |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 374 | helper = rcu_dereference_protected(master_help->helper, |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 375 | lockdep_is_held(&nf_conntrack_expect_lock)); |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 376 | if (helper) { |
| 377 | exp->timeout.expires = jiffies + |
| 378 | helper->expect_policy[exp->class].timeout * HZ; |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 379 | } |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 380 | add_timer(&exp->timeout); |
| 381 | |
Alexey Dobriyan | 0d55af8 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 382 | NF_CT_STAT_INC(net, expect_create); |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 383 | return 0; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 384 | } |
| 385 | |
| 386 | /* 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] | 387 | static void evict_oldest_expect(struct nf_conn *master, |
| 388 | struct nf_conntrack_expect *new) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 389 | { |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 390 | struct nf_conn_help *master_help = nfct_help(master); |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 391 | struct nf_conntrack_expect *exp, *last = NULL; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 392 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 393 | hlist_for_each_entry(exp, &master_help->expectations, lnode) { |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 394 | if (exp->class == new->class) |
| 395 | last = exp; |
| 396 | } |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 397 | |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 398 | if (last && del_timer(&last->timeout)) { |
| 399 | nf_ct_unlink_expect(last); |
| 400 | nf_ct_expect_put(last); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 401 | } |
| 402 | } |
| 403 | |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 404 | static inline int __nf_ct_expect_check(struct nf_conntrack_expect *expect) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 405 | { |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 406 | const struct nf_conntrack_expect_policy *p; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 407 | struct nf_conntrack_expect *i; |
| 408 | struct nf_conn *master = expect->master; |
| 409 | struct nf_conn_help *master_help = nfct_help(master); |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 410 | struct nf_conntrack_helper *helper; |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 411 | struct net *net = nf_ct_exp_net(expect); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 412 | struct hlist_node *next; |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 413 | unsigned int h; |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 414 | int ret = 1; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 415 | |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 416 | if (!master_help) { |
Patrick McHarrdy | 3c158f7 | 2007-06-05 12:55:27 -0700 | [diff] [blame] | 417 | ret = -ESHUTDOWN; |
| 418 | goto out; |
| 419 | } |
Florian Westphal | a9a083c | 2016-05-06 00:51:48 +0200 | [diff] [blame] | 420 | h = nf_ct_expect_dst_hash(net, &expect->tuple); |
Florian Westphal | 0a93aae | 2016-05-06 00:51:49 +0200 | [diff] [blame] | 421 | hlist_for_each_entry_safe(i, next, &nf_ct_expect_hash[h], hnode) { |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 422 | if (expect_matches(i, expect)) { |
Pablo Neira Ayuso | 2614f86 | 2012-08-16 02:25:24 +0200 | [diff] [blame] | 423 | if (del_timer(&i->timeout)) { |
| 424 | nf_ct_unlink_expect(i); |
| 425 | nf_ct_expect_put(i); |
| 426 | break; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 427 | } |
| 428 | } else if (expect_clash(i, expect)) { |
| 429 | ret = -EBUSY; |
| 430 | goto out; |
| 431 | } |
| 432 | } |
| 433 | /* Will be over limit? */ |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 434 | helper = rcu_dereference_protected(master_help->helper, |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 435 | lockdep_is_held(&nf_conntrack_expect_lock)); |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 436 | if (helper) { |
| 437 | p = &helper->expect_policy[expect->class]; |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 438 | if (p->max_expected && |
| 439 | master_help->expecting[expect->class] >= p->max_expected) { |
| 440 | evict_oldest_expect(master, expect); |
| 441 | if (master_help->expecting[expect->class] |
| 442 | >= p->max_expected) { |
| 443 | ret = -EMFILE; |
| 444 | goto out; |
| 445 | } |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 446 | } |
| 447 | } |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 448 | |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 449 | if (net->ct.expect_count >= nf_ct_expect_max) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 450 | net_warn_ratelimited("nf_conntrack: expectation table full\n"); |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 451 | ret = -EMFILE; |
Patrick McHardy | f264a7d | 2007-07-07 22:36:24 -0700 | [diff] [blame] | 452 | } |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 453 | out: |
| 454 | return ret; |
| 455 | } |
| 456 | |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame] | 457 | int nf_ct_expect_related_report(struct nf_conntrack_expect *expect, |
Patrick McHardy | ec464e5 | 2013-04-17 06:47:08 +0000 | [diff] [blame] | 458 | u32 portid, int report) |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 459 | { |
| 460 | int ret; |
| 461 | |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 462 | spin_lock_bh(&nf_conntrack_expect_lock); |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 463 | ret = __nf_ct_expect_check(expect); |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 464 | if (ret <= 0) |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 465 | goto out; |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 466 | |
Pablo Neira Ayuso | 3d058d7 | 2011-12-18 01:55:54 +0100 | [diff] [blame] | 467 | ret = nf_ct_expect_insert(expect); |
| 468 | if (ret < 0) |
| 469 | goto out; |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 470 | spin_unlock_bh(&nf_conntrack_expect_lock); |
Patrick McHardy | ec464e5 | 2013-04-17 06:47:08 +0000 | [diff] [blame] | 471 | nf_ct_expect_event_report(IPEXP_NEW, expect, portid, report); |
Pablo Neira Ayuso | 8373167 | 2009-04-06 17:47:20 +0200 | [diff] [blame] | 472 | return ret; |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 473 | out: |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 474 | spin_unlock_bh(&nf_conntrack_expect_lock); |
Pablo Neira Ayuso | 19abb7b | 2008-11-18 11:56:20 +0100 | [diff] [blame] | 475 | return ret; |
| 476 | } |
| 477 | EXPORT_SYMBOL_GPL(nf_ct_expect_related_report); |
| 478 | |
Jan Engelhardt | 54b07dc | 2011-04-21 09:32:45 +0200 | [diff] [blame] | 479 | #ifdef CONFIG_NF_CONNTRACK_PROCFS |
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 | { |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 487 | struct ct_expect_iter_state *st = seq->private; |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 488 | struct hlist_node *n; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 489 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 490 | for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) { |
Florian Westphal | 0a93aae | 2016-05-06 00:51:49 +0200 | [diff] [blame] | 491 | n = rcu_dereference(hlist_first_rcu(&nf_ct_expect_hash[st->bucket])); |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 492 | if (n) |
| 493 | return n; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 494 | } |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 495 | return NULL; |
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_next(struct seq_file *seq, |
| 499 | struct hlist_node *head) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 500 | { |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 501 | struct ct_expect_iter_state *st = seq->private; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 502 | |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 503 | head = rcu_dereference(hlist_next_rcu(head)); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 504 | while (head == NULL) { |
| 505 | if (++st->bucket >= nf_ct_expect_hsize) |
| 506 | return NULL; |
Florian Westphal | 0a93aae | 2016-05-06 00:51:49 +0200 | [diff] [blame] | 507 | head = rcu_dereference(hlist_first_rcu(&nf_ct_expect_hash[st->bucket])); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 508 | } |
| 509 | return head; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 510 | } |
| 511 | |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 512 | static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos) |
| 513 | { |
| 514 | struct hlist_node *head = ct_expect_get_first(seq); |
| 515 | |
| 516 | if (head) |
| 517 | while (pos && (head = ct_expect_get_next(seq, head))) |
| 518 | pos--; |
| 519 | return pos ? NULL : head; |
| 520 | } |
| 521 | |
| 522 | static void *exp_seq_start(struct seq_file *seq, loff_t *pos) |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 523 | __acquires(RCU) |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 524 | { |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 525 | rcu_read_lock(); |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 526 | return ct_expect_get_idx(seq, *pos); |
| 527 | } |
| 528 | |
| 529 | static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 530 | { |
| 531 | (*pos)++; |
| 532 | return ct_expect_get_next(seq, v); |
| 533 | } |
| 534 | |
| 535 | static void exp_seq_stop(struct seq_file *seq, void *v) |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 536 | __releases(RCU) |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 537 | { |
Patrick McHardy | 7d0742d | 2008-01-31 04:38:19 -0800 | [diff] [blame] | 538 | rcu_read_unlock(); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 539 | } |
| 540 | |
| 541 | static int exp_seq_show(struct seq_file *s, void *v) |
| 542 | { |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 543 | struct nf_conntrack_expect *expect; |
Patrick McHardy | b87921b | 2010-02-11 12:22:48 +0100 | [diff] [blame] | 544 | struct nf_conntrack_helper *helper; |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 545 | struct hlist_node *n = v; |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 546 | char *delim = ""; |
Patrick McHardy | 5d08ad4 | 2007-07-07 22:34:07 -0700 | [diff] [blame] | 547 | |
| 548 | expect = hlist_entry(n, struct nf_conntrack_expect, hnode); |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 549 | |
| 550 | if (expect->timeout.function) |
| 551 | seq_printf(s, "%ld ", timer_pending(&expect->timeout) |
| 552 | ? (long)(expect->timeout.expires - jiffies)/HZ : 0); |
| 553 | else |
| 554 | seq_printf(s, "- "); |
| 555 | seq_printf(s, "l3proto = %u proto=%u ", |
| 556 | expect->tuple.src.l3num, |
| 557 | expect->tuple.dst.protonum); |
| 558 | print_tuple(s, &expect->tuple, |
| 559 | __nf_ct_l3proto_find(expect->tuple.src.l3num), |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 560 | __nf_ct_l4proto_find(expect->tuple.src.l3num, |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 561 | expect->tuple.dst.protonum)); |
Patrick McHardy | 4bb119e | 2008-03-25 20:08:17 -0700 | [diff] [blame] | 562 | |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 563 | if (expect->flags & NF_CT_EXPECT_PERMANENT) { |
| 564 | seq_printf(s, "PERMANENT"); |
| 565 | delim = ","; |
| 566 | } |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 567 | if (expect->flags & NF_CT_EXPECT_INACTIVE) { |
Patrick McHardy | 359b9ab | 2008-03-25 20:08:37 -0700 | [diff] [blame] | 568 | seq_printf(s, "%sINACTIVE", delim); |
Pablo Neira Ayuso | bc01befd | 2010-09-28 21:06:34 +0200 | [diff] [blame] | 569 | delim = ","; |
| 570 | } |
| 571 | if (expect->flags & NF_CT_EXPECT_USERSPACE) |
| 572 | seq_printf(s, "%sUSERSPACE", delim); |
Patrick McHardy | 4bb119e | 2008-03-25 20:08:17 -0700 | [diff] [blame] | 573 | |
Patrick McHardy | b87921b | 2010-02-11 12:22:48 +0100 | [diff] [blame] | 574 | helper = rcu_dereference(nfct_help(expect->master)->helper); |
| 575 | if (helper) { |
| 576 | seq_printf(s, "%s%s", expect->flags ? " " : "", helper->name); |
Liping Zhang | b173a28 | 2016-08-08 21:57:58 +0800 | [diff] [blame] | 577 | if (helper->expect_policy[expect->class].name[0]) |
Patrick McHardy | b87921b | 2010-02-11 12:22:48 +0100 | [diff] [blame] | 578 | seq_printf(s, "/%s", |
| 579 | helper->expect_policy[expect->class].name); |
| 580 | } |
| 581 | |
Joe Perches | 1ca9e41 | 2015-03-16 11:25:17 -0700 | [diff] [blame] | 582 | seq_putc(s, '\n'); |
| 583 | |
| 584 | return 0; |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 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 | }; |
Jan Engelhardt | 54b07dc | 2011-04-21 09:32:45 +0200 | [diff] [blame] | 607 | #endif /* CONFIG_NF_CONNTRACK_PROCFS */ |
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 | { |
Jan Engelhardt | 54b07dc | 2011-04-21 09:32:45 +0200 | [diff] [blame] | 611 | #ifdef CONFIG_NF_CONNTRACK_PROCFS |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 612 | struct proc_dir_entry *proc; |
Philip Whineray | f13f2ae | 2015-11-22 11:35:07 +0000 | [diff] [blame] | 613 | kuid_t root_uid; |
| 614 | kgid_t root_gid; |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 615 | |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 616 | proc = proc_create("nf_conntrack_expect", 0440, net->proc_net, |
| 617 | &exp_file_ops); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 618 | if (!proc) |
| 619 | return -ENOMEM; |
Philip Whineray | f13f2ae | 2015-11-22 11:35:07 +0000 | [diff] [blame] | 620 | |
| 621 | root_uid = make_kuid(net->user_ns, 0); |
| 622 | root_gid = make_kgid(net->user_ns, 0); |
| 623 | if (uid_valid(root_uid) && gid_valid(root_gid)) |
| 624 | proc_set_user(proc, root_uid, root_gid); |
Jan Engelhardt | 54b07dc | 2011-04-21 09:32:45 +0200 | [diff] [blame] | 625 | #endif /* CONFIG_NF_CONNTRACK_PROCFS */ |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 626 | return 0; |
| 627 | } |
| 628 | |
Alexey Dobriyan | dc5129f | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 629 | static void exp_proc_remove(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 630 | { |
Jan Engelhardt | 54b07dc | 2011-04-21 09:32:45 +0200 | [diff] [blame] | 631 | #ifdef CONFIG_NF_CONNTRACK_PROCFS |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 632 | remove_proc_entry("nf_conntrack_expect", net->proc_net); |
Jan Engelhardt | 54b07dc | 2011-04-21 09:32:45 +0200 | [diff] [blame] | 633 | #endif /* CONFIG_NF_CONNTRACK_PROCFS */ |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 634 | } |
| 635 | |
Alexey Dobriyan | 13ccdfc | 2010-02-08 11:17:22 -0800 | [diff] [blame] | 636 | module_param_named(expect_hashsize, nf_ct_expect_hsize, uint, 0400); |
Patrick McHardy | a71c085 | 2007-07-07 22:33:47 -0700 | [diff] [blame] | 637 | |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 638 | int nf_conntrack_expect_pernet_init(struct net *net) |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 639 | { |
Alexey Dobriyan | 9b03f38 | 2008-10-08 11:35:03 +0200 | [diff] [blame] | 640 | net->ct.expect_count = 0; |
Florian Westphal | 0a93aae | 2016-05-06 00:51:49 +0200 | [diff] [blame] | 641 | return exp_proc_init(net); |
Patrick McHardy | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 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 | e9c1b08 | 2007-07-07 22:32:53 -0700 | [diff] [blame] | 647 | } |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 648 | |
| 649 | int nf_conntrack_expect_init(void) |
| 650 | { |
| 651 | if (!nf_ct_expect_hsize) { |
| 652 | nf_ct_expect_hsize = nf_conntrack_htable_size / 256; |
| 653 | if (!nf_ct_expect_hsize) |
| 654 | nf_ct_expect_hsize = 1; |
| 655 | } |
| 656 | nf_ct_expect_max = nf_ct_expect_hsize * 4; |
| 657 | nf_ct_expect_cachep = kmem_cache_create("nf_conntrack_expect", |
| 658 | sizeof(struct nf_conntrack_expect), |
| 659 | 0, 0, NULL); |
| 660 | if (!nf_ct_expect_cachep) |
| 661 | return -ENOMEM; |
Florian Westphal | 0a93aae | 2016-05-06 00:51:49 +0200 | [diff] [blame] | 662 | |
| 663 | nf_ct_expect_hash = nf_ct_alloc_hashtable(&nf_ct_expect_hsize, 0); |
| 664 | if (!nf_ct_expect_hash) { |
| 665 | kmem_cache_destroy(nf_ct_expect_cachep); |
| 666 | return -ENOMEM; |
| 667 | } |
| 668 | |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 669 | return 0; |
| 670 | } |
| 671 | |
| 672 | void nf_conntrack_expect_fini(void) |
| 673 | { |
| 674 | rcu_barrier(); /* Wait for call_rcu() before destroy */ |
| 675 | kmem_cache_destroy(nf_ct_expect_cachep); |
Florian Westphal | 0a93aae | 2016-05-06 00:51:49 +0200 | [diff] [blame] | 676 | nf_ct_free_hashtable(nf_ct_expect_hash, nf_ct_expect_hsize); |
Gao feng | 83b4dbe | 2013-01-21 22:10:25 +0000 | [diff] [blame] | 677 | } |