Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 1 | /* L3/L4 protocol support for nf_conntrack. */ |
| 2 | |
| 3 | /* (C) 1999-2001 Paul `Rusty' Russell |
| 4 | * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> |
| 5 | * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/types.h> |
| 13 | #include <linux/netfilter.h> |
| 14 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 15 | #include <linux/slab.h> |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 16 | #include <linux/mutex.h> |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 17 | #include <linux/vmalloc.h> |
| 18 | #include <linux/stddef.h> |
| 19 | #include <linux/err.h> |
| 20 | #include <linux/percpu.h> |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 21 | #include <linux/notifier.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/netdevice.h> |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 24 | #include <linux/rtnetlink.h> |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 25 | |
| 26 | #include <net/netfilter/nf_conntrack.h> |
| 27 | #include <net/netfilter/nf_conntrack_l3proto.h> |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 28 | #include <net/netfilter/nf_conntrack_l4proto.h> |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 29 | #include <net/netfilter/nf_conntrack_core.h> |
| 30 | |
Arnd Bergmann | 0906a37 | 2010-03-09 20:59:15 +0100 | [diff] [blame] | 31 | static struct nf_conntrack_l4proto __rcu **nf_ct_protos[PF_MAX] __read_mostly; |
| 32 | struct nf_conntrack_l3proto __rcu *nf_ct_l3protos[AF_MAX] __read_mostly; |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 33 | EXPORT_SYMBOL_GPL(nf_ct_l3protos); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 34 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 35 | static DEFINE_MUTEX(nf_ct_proto_mutex); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 36 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 37 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 38 | static int |
Eric W. Biederman | f99e8f7 | 2012-04-19 13:43:55 +0000 | [diff] [blame] | 39 | nf_ct_register_sysctl(struct ctl_table_header **header, const char *path, |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 40 | struct ctl_table *table, unsigned int *users) |
| 41 | { |
| 42 | if (*header == NULL) { |
Eric W. Biederman | f99e8f7 | 2012-04-19 13:43:55 +0000 | [diff] [blame] | 43 | *header = register_net_sysctl(&init_net, path, table); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 44 | if (*header == NULL) |
| 45 | return -ENOMEM; |
| 46 | } |
| 47 | if (users != NULL) |
| 48 | (*users)++; |
| 49 | return 0; |
| 50 | } |
| 51 | |
| 52 | static void |
| 53 | nf_ct_unregister_sysctl(struct ctl_table_header **header, |
| 54 | struct ctl_table *table, unsigned int *users) |
| 55 | { |
| 56 | if (users != NULL && --*users > 0) |
| 57 | return; |
Pavel Emelyanov | b3fd3ff | 2008-01-09 00:34:02 -0800 | [diff] [blame] | 58 | |
Eric W. Biederman | 5dd3df1 | 2012-04-19 13:24:33 +0000 | [diff] [blame] | 59 | unregister_net_sysctl_table(*header); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 60 | *header = NULL; |
| 61 | } |
| 62 | #endif |
| 63 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 64 | struct nf_conntrack_l4proto * |
| 65 | __nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 66 | { |
| 67 | if (unlikely(l3proto >= AF_MAX || nf_ct_protos[l3proto] == NULL)) |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 68 | return &nf_conntrack_l4proto_generic; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 69 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 70 | return rcu_dereference(nf_ct_protos[l3proto][l4proto]); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 71 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 72 | EXPORT_SYMBOL_GPL(__nf_ct_l4proto_find); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 73 | |
| 74 | /* this is guaranteed to always return a valid protocol helper, since |
| 75 | * it falls back to generic_protocol */ |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 76 | struct nf_conntrack_l3proto * |
| 77 | nf_ct_l3proto_find_get(u_int16_t l3proto) |
| 78 | { |
| 79 | struct nf_conntrack_l3proto *p; |
| 80 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 81 | rcu_read_lock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 82 | p = __nf_ct_l3proto_find(l3proto); |
| 83 | if (!try_module_get(p->me)) |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 84 | p = &nf_conntrack_l3proto_generic; |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 85 | rcu_read_unlock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 86 | |
| 87 | return p; |
| 88 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 89 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_find_get); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 90 | |
| 91 | void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p) |
| 92 | { |
| 93 | module_put(p->me); |
| 94 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 95 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_put); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 96 | |
| 97 | int |
| 98 | nf_ct_l3proto_try_module_get(unsigned short l3proto) |
| 99 | { |
| 100 | int ret; |
| 101 | struct nf_conntrack_l3proto *p; |
| 102 | |
| 103 | retry: p = nf_ct_l3proto_find_get(l3proto); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 104 | if (p == &nf_conntrack_l3proto_generic) { |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 105 | ret = request_module("nf_conntrack-%d", l3proto); |
| 106 | if (!ret) |
| 107 | goto retry; |
| 108 | |
| 109 | return -EPROTOTYPE; |
| 110 | } |
| 111 | |
| 112 | return 0; |
| 113 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 114 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_try_module_get); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 115 | |
| 116 | void nf_ct_l3proto_module_put(unsigned short l3proto) |
| 117 | { |
| 118 | struct nf_conntrack_l3proto *p; |
| 119 | |
Patrick McHardy | 3b254c5 | 2010-05-10 17:45:56 +0200 | [diff] [blame] | 120 | /* rcu_read_lock not necessary since the caller holds a reference, but |
| 121 | * taken anyways to avoid lockdep warnings in __nf_ct_l3proto_find() |
| 122 | */ |
| 123 | rcu_read_lock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 124 | p = __nf_ct_l3proto_find(l3proto); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 125 | module_put(p->me); |
Patrick McHardy | 3b254c5 | 2010-05-10 17:45:56 +0200 | [diff] [blame] | 126 | rcu_read_unlock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 127 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 128 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_module_put); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 129 | |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 130 | struct nf_conntrack_l4proto * |
| 131 | nf_ct_l4proto_find_get(u_int16_t l3num, u_int8_t l4num) |
| 132 | { |
| 133 | struct nf_conntrack_l4proto *p; |
| 134 | |
| 135 | rcu_read_lock(); |
| 136 | p = __nf_ct_l4proto_find(l3num, l4num); |
| 137 | if (!try_module_get(p->me)) |
| 138 | p = &nf_conntrack_l4proto_generic; |
| 139 | rcu_read_unlock(); |
| 140 | |
| 141 | return p; |
| 142 | } |
| 143 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_find_get); |
| 144 | |
| 145 | void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p) |
| 146 | { |
| 147 | module_put(p->me); |
| 148 | } |
| 149 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_put); |
| 150 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 151 | static int kill_l3proto(struct nf_conn *i, void *data) |
| 152 | { |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 153 | return nf_ct_l3num(i) == ((struct nf_conntrack_l3proto *)data)->l3proto; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 154 | } |
| 155 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 156 | static int kill_l4proto(struct nf_conn *i, void *data) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 157 | { |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 158 | struct nf_conntrack_l4proto *l4proto; |
| 159 | l4proto = (struct nf_conntrack_l4proto *)data; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 160 | return nf_ct_protonum(i) == l4proto->l4proto && |
| 161 | nf_ct_l3num(i) == l4proto->l3proto; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 162 | } |
| 163 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 164 | static int nf_ct_l3proto_register_sysctl(struct nf_conntrack_l3proto *l3proto) |
| 165 | { |
| 166 | int err = 0; |
| 167 | |
| 168 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 169 | if (l3proto->ctl_table != NULL) { |
| 170 | err = nf_ct_register_sysctl(&l3proto->ctl_table_header, |
| 171 | l3proto->ctl_table_path, |
| 172 | l3proto->ctl_table, NULL); |
| 173 | } |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 174 | #endif |
| 175 | return err; |
| 176 | } |
| 177 | |
| 178 | static void nf_ct_l3proto_unregister_sysctl(struct nf_conntrack_l3proto *l3proto) |
| 179 | { |
| 180 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 181 | if (l3proto->ctl_table_header != NULL) |
| 182 | nf_ct_unregister_sysctl(&l3proto->ctl_table_header, |
| 183 | l3proto->ctl_table, NULL); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 184 | #endif |
| 185 | } |
| 186 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 187 | int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto) |
| 188 | { |
| 189 | int ret = 0; |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 190 | struct nf_conntrack_l3proto *old; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 191 | |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 192 | if (proto->l3proto >= AF_MAX) |
| 193 | return -EBUSY; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 194 | |
Holger Eitzenberger | d0dba72 | 2009-03-25 18:24:48 +0100 | [diff] [blame] | 195 | if (proto->tuple_to_nlattr && !proto->nlattr_tuple_size) |
| 196 | return -EINVAL; |
| 197 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 198 | mutex_lock(&nf_ct_proto_mutex); |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 199 | old = rcu_dereference_protected(nf_ct_l3protos[proto->l3proto], |
| 200 | lockdep_is_held(&nf_ct_proto_mutex)); |
| 201 | if (old != &nf_conntrack_l3proto_generic) { |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 202 | ret = -EBUSY; |
| 203 | goto out_unlock; |
| 204 | } |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 205 | |
| 206 | ret = nf_ct_l3proto_register_sysctl(proto); |
| 207 | if (ret < 0) |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 208 | goto out_unlock; |
| 209 | |
Holger Eitzenberger | d0dba72 | 2009-03-25 18:24:48 +0100 | [diff] [blame] | 210 | if (proto->nlattr_tuple_size) |
| 211 | proto->nla_size = 3 * proto->nlattr_tuple_size(); |
| 212 | |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 213 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 214 | |
| 215 | out_unlock: |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 216 | mutex_unlock(&nf_ct_proto_mutex); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 217 | return ret; |
| 218 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 219 | EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_register); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 220 | |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 221 | void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 222 | { |
Alexey Dobriyan | 678d667 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 223 | struct net *net; |
| 224 | |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 225 | BUG_ON(proto->l3proto >= AF_MAX); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 226 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 227 | mutex_lock(&nf_ct_proto_mutex); |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 228 | BUG_ON(rcu_dereference_protected(nf_ct_l3protos[proto->l3proto], |
| 229 | lockdep_is_held(&nf_ct_proto_mutex) |
| 230 | ) != proto); |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 231 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], |
| 232 | &nf_conntrack_l3proto_generic); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 233 | nf_ct_l3proto_unregister_sysctl(proto); |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 234 | mutex_unlock(&nf_ct_proto_mutex); |
| 235 | |
| 236 | synchronize_rcu(); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 237 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 238 | /* Remove all contrack entries for this protocol */ |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 239 | rtnl_lock(); |
Alexey Dobriyan | 678d667 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 240 | for_each_net(net) |
| 241 | nf_ct_iterate_cleanup(net, kill_l3proto, proto); |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 242 | rtnl_unlock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 243 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 244 | EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_unregister); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 245 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 246 | static int nf_ct_l4proto_register_sysctl(struct nf_conntrack_l4proto *l4proto) |
| 247 | { |
| 248 | int err = 0; |
| 249 | |
| 250 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 251 | if (l4proto->ctl_table != NULL) { |
| 252 | err = nf_ct_register_sysctl(l4proto->ctl_table_header, |
Eric W. Biederman | f99e8f7 | 2012-04-19 13:43:55 +0000 | [diff] [blame] | 253 | "net/netfilter", |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 254 | l4proto->ctl_table, |
| 255 | l4proto->ctl_table_users); |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 256 | if (err < 0) |
| 257 | goto out; |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 258 | } |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 259 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
| 260 | if (l4proto->ctl_compat_table != NULL) { |
| 261 | err = nf_ct_register_sysctl(&l4proto->ctl_compat_table_header, |
Eric W. Biederman | f99e8f7 | 2012-04-19 13:43:55 +0000 | [diff] [blame] | 262 | "net/ipv4/netfilter", |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 263 | l4proto->ctl_compat_table, NULL); |
| 264 | if (err == 0) |
| 265 | goto out; |
| 266 | nf_ct_unregister_sysctl(l4proto->ctl_table_header, |
| 267 | l4proto->ctl_table, |
| 268 | l4proto->ctl_table_users); |
| 269 | } |
| 270 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
| 271 | out: |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 272 | #endif /* CONFIG_SYSCTL */ |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 273 | return err; |
| 274 | } |
| 275 | |
| 276 | static void nf_ct_l4proto_unregister_sysctl(struct nf_conntrack_l4proto *l4proto) |
| 277 | { |
| 278 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 279 | if (l4proto->ctl_table_header != NULL && |
| 280 | *l4proto->ctl_table_header != NULL) |
| 281 | nf_ct_unregister_sysctl(l4proto->ctl_table_header, |
| 282 | l4proto->ctl_table, |
| 283 | l4proto->ctl_table_users); |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 284 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
| 285 | if (l4proto->ctl_compat_table_header != NULL) |
| 286 | nf_ct_unregister_sysctl(&l4proto->ctl_compat_table_header, |
| 287 | l4proto->ctl_compat_table, NULL); |
| 288 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 289 | #endif /* CONFIG_SYSCTL */ |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 290 | } |
| 291 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 292 | /* FIXME: Allow NULL functions and sub in pointers to generic for |
| 293 | them. --RR */ |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 294 | int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *l4proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 295 | { |
| 296 | int ret = 0; |
| 297 | |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 298 | if (l4proto->l3proto >= PF_MAX) |
| 299 | return -EBUSY; |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 300 | |
Holger Eitzenberger | d0dba72 | 2009-03-25 18:24:48 +0100 | [diff] [blame] | 301 | if ((l4proto->to_nlattr && !l4proto->nlattr_size) |
| 302 | || (l4proto->tuple_to_nlattr && !l4proto->nlattr_tuple_size)) |
| 303 | return -EINVAL; |
| 304 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 305 | mutex_lock(&nf_ct_proto_mutex); |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 306 | if (!nf_ct_protos[l4proto->l3proto]) { |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 307 | /* l3proto may be loaded latter. */ |
Eric Dumazet | c5d277d | 2010-11-15 19:45:13 +0100 | [diff] [blame] | 308 | struct nf_conntrack_l4proto __rcu **proto_array; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 309 | int i; |
| 310 | |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 311 | proto_array = kmalloc(MAX_NF_CT_PROTO * |
| 312 | sizeof(struct nf_conntrack_l4proto *), |
| 313 | GFP_KERNEL); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 314 | if (proto_array == NULL) { |
| 315 | ret = -ENOMEM; |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 316 | goto out_unlock; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 317 | } |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 318 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 319 | for (i = 0; i < MAX_NF_CT_PROTO; i++) |
Eric Dumazet | c5d277d | 2010-11-15 19:45:13 +0100 | [diff] [blame] | 320 | RCU_INIT_POINTER(proto_array[i], &nf_conntrack_l4proto_generic); |
Eric Dumazet | d817d29 | 2010-10-29 19:59:40 +0200 | [diff] [blame] | 321 | |
| 322 | /* Before making proto_array visible to lockless readers, |
| 323 | * we must make sure its content is committed to memory. |
| 324 | */ |
| 325 | smp_wmb(); |
| 326 | |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 327 | nf_ct_protos[l4proto->l3proto] = proto_array; |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 328 | } else if (rcu_dereference_protected( |
| 329 | nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
| 330 | lockdep_is_held(&nf_ct_proto_mutex) |
| 331 | ) != &nf_conntrack_l4proto_generic) { |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 332 | ret = -EBUSY; |
| 333 | goto out_unlock; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 334 | } |
| 335 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 336 | ret = nf_ct_l4proto_register_sysctl(l4proto); |
| 337 | if (ret < 0) |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 338 | goto out_unlock; |
| 339 | |
Holger Eitzenberger | d0dba72 | 2009-03-25 18:24:48 +0100 | [diff] [blame] | 340 | l4proto->nla_size = 0; |
| 341 | if (l4proto->nlattr_size) |
| 342 | l4proto->nla_size += l4proto->nlattr_size(); |
| 343 | if (l4proto->nlattr_tuple_size) |
| 344 | l4proto->nla_size += 3 * l4proto->nlattr_tuple_size(); |
| 345 | |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 346 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
| 347 | l4proto); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 348 | |
| 349 | out_unlock: |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 350 | mutex_unlock(&nf_ct_proto_mutex); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 351 | return ret; |
| 352 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 353 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_register); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 354 | |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 355 | void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *l4proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 356 | { |
Alexey Dobriyan | 678d667 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 357 | struct net *net; |
| 358 | |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 359 | BUG_ON(l4proto->l3proto >= PF_MAX); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 360 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 361 | mutex_lock(&nf_ct_proto_mutex); |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 362 | BUG_ON(rcu_dereference_protected( |
| 363 | nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
| 364 | lockdep_is_held(&nf_ct_proto_mutex) |
| 365 | ) != l4proto); |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 366 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
| 367 | &nf_conntrack_l4proto_generic); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 368 | nf_ct_l4proto_unregister_sysctl(l4proto); |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 369 | mutex_unlock(&nf_ct_proto_mutex); |
| 370 | |
| 371 | synchronize_rcu(); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 372 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 373 | /* Remove all contrack entries for this protocol */ |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 374 | rtnl_lock(); |
Alexey Dobriyan | 678d667 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 375 | for_each_net(net) |
| 376 | nf_ct_iterate_cleanup(net, kill_l4proto, l4proto); |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 377 | rtnl_unlock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 378 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 379 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_unregister); |
Patrick McHardy | ac5357e | 2007-03-14 16:38:25 -0700 | [diff] [blame] | 380 | |
| 381 | int nf_conntrack_proto_init(void) |
| 382 | { |
| 383 | unsigned int i; |
| 384 | int err; |
| 385 | |
| 386 | err = nf_ct_l4proto_register_sysctl(&nf_conntrack_l4proto_generic); |
| 387 | if (err < 0) |
| 388 | return err; |
| 389 | |
| 390 | for (i = 0; i < AF_MAX; i++) |
| 391 | rcu_assign_pointer(nf_ct_l3protos[i], |
| 392 | &nf_conntrack_l3proto_generic); |
| 393 | return 0; |
| 394 | } |
| 395 | |
| 396 | void nf_conntrack_proto_fini(void) |
| 397 | { |
| 398 | unsigned int i; |
| 399 | |
| 400 | nf_ct_l4proto_unregister_sysctl(&nf_conntrack_l4proto_generic); |
| 401 | |
| 402 | /* free l3proto protocol tables */ |
| 403 | for (i = 0; i < PF_MAX; i++) |
| 404 | kfree(nf_ct_protos[i]); |
| 405 | } |