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 |
Pavel Emelyanov | b3fd3ff | 2008-01-09 00:34:02 -0800 | [diff] [blame] | 39 | nf_ct_register_sysctl(struct ctl_table_header **header, struct ctl_path *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) { |
Pavel Emelyanov | b3fd3ff | 2008-01-09 00:34:02 -0800 | [diff] [blame] | 43 | *header = register_sysctl_paths(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 | |
| 59 | unregister_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 | |
| 130 | static int kill_l3proto(struct nf_conn *i, void *data) |
| 131 | { |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 132 | return nf_ct_l3num(i) == ((struct nf_conntrack_l3proto *)data)->l3proto; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 133 | } |
| 134 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 135 | static int kill_l4proto(struct nf_conn *i, void *data) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 136 | { |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 137 | struct nf_conntrack_l4proto *l4proto; |
| 138 | l4proto = (struct nf_conntrack_l4proto *)data; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 139 | return nf_ct_protonum(i) == l4proto->l4proto && |
| 140 | nf_ct_l3num(i) == l4proto->l3proto; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 141 | } |
| 142 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 143 | static int nf_ct_l3proto_register_sysctl(struct nf_conntrack_l3proto *l3proto) |
| 144 | { |
| 145 | int err = 0; |
| 146 | |
| 147 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 148 | if (l3proto->ctl_table != NULL) { |
| 149 | err = nf_ct_register_sysctl(&l3proto->ctl_table_header, |
| 150 | l3proto->ctl_table_path, |
| 151 | l3proto->ctl_table, NULL); |
| 152 | } |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 153 | #endif |
| 154 | return err; |
| 155 | } |
| 156 | |
| 157 | static void nf_ct_l3proto_unregister_sysctl(struct nf_conntrack_l3proto *l3proto) |
| 158 | { |
| 159 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 160 | if (l3proto->ctl_table_header != NULL) |
| 161 | nf_ct_unregister_sysctl(&l3proto->ctl_table_header, |
| 162 | l3proto->ctl_table, NULL); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 163 | #endif |
| 164 | } |
| 165 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 166 | int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto) |
| 167 | { |
| 168 | int ret = 0; |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 169 | struct nf_conntrack_l3proto *old; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 170 | |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 171 | if (proto->l3proto >= AF_MAX) |
| 172 | return -EBUSY; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 173 | |
Holger Eitzenberger | d0dba72 | 2009-03-25 18:24:48 +0100 | [diff] [blame] | 174 | if (proto->tuple_to_nlattr && !proto->nlattr_tuple_size) |
| 175 | return -EINVAL; |
| 176 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 177 | mutex_lock(&nf_ct_proto_mutex); |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 178 | old = rcu_dereference_protected(nf_ct_l3protos[proto->l3proto], |
| 179 | lockdep_is_held(&nf_ct_proto_mutex)); |
| 180 | if (old != &nf_conntrack_l3proto_generic) { |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 181 | ret = -EBUSY; |
| 182 | goto out_unlock; |
| 183 | } |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 184 | |
| 185 | ret = nf_ct_l3proto_register_sysctl(proto); |
| 186 | if (ret < 0) |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 187 | goto out_unlock; |
| 188 | |
Holger Eitzenberger | d0dba72 | 2009-03-25 18:24:48 +0100 | [diff] [blame] | 189 | if (proto->nlattr_tuple_size) |
| 190 | proto->nla_size = 3 * proto->nlattr_tuple_size(); |
| 191 | |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 192 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 193 | |
| 194 | out_unlock: |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 195 | mutex_unlock(&nf_ct_proto_mutex); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 196 | return ret; |
| 197 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 198 | EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_register); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 199 | |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 200 | void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 201 | { |
Alexey Dobriyan | 678d667 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 202 | struct net *net; |
| 203 | |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 204 | BUG_ON(proto->l3proto >= AF_MAX); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 205 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 206 | mutex_lock(&nf_ct_proto_mutex); |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 207 | BUG_ON(rcu_dereference_protected(nf_ct_l3protos[proto->l3proto], |
| 208 | lockdep_is_held(&nf_ct_proto_mutex) |
| 209 | ) != proto); |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 210 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], |
| 211 | &nf_conntrack_l3proto_generic); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 212 | nf_ct_l3proto_unregister_sysctl(proto); |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 213 | mutex_unlock(&nf_ct_proto_mutex); |
| 214 | |
| 215 | synchronize_rcu(); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 216 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 217 | /* Remove all contrack entries for this protocol */ |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 218 | rtnl_lock(); |
Alexey Dobriyan | 678d667 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 219 | for_each_net(net) |
| 220 | nf_ct_iterate_cleanup(net, kill_l3proto, proto); |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 221 | rtnl_unlock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 222 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 223 | EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_unregister); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 224 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 225 | static int nf_ct_l4proto_register_sysctl(struct nf_conntrack_l4proto *l4proto) |
| 226 | { |
| 227 | int err = 0; |
| 228 | |
| 229 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 230 | if (l4proto->ctl_table != NULL) { |
| 231 | err = nf_ct_register_sysctl(l4proto->ctl_table_header, |
| 232 | nf_net_netfilter_sysctl_path, |
| 233 | l4proto->ctl_table, |
| 234 | l4proto->ctl_table_users); |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 235 | if (err < 0) |
| 236 | goto out; |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 237 | } |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 238 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
| 239 | if (l4proto->ctl_compat_table != NULL) { |
| 240 | err = nf_ct_register_sysctl(&l4proto->ctl_compat_table_header, |
| 241 | nf_net_ipv4_netfilter_sysctl_path, |
| 242 | l4proto->ctl_compat_table, NULL); |
| 243 | if (err == 0) |
| 244 | goto out; |
| 245 | nf_ct_unregister_sysctl(l4proto->ctl_table_header, |
| 246 | l4proto->ctl_table, |
| 247 | l4proto->ctl_table_users); |
| 248 | } |
| 249 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
| 250 | out: |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 251 | #endif /* CONFIG_SYSCTL */ |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 252 | return err; |
| 253 | } |
| 254 | |
| 255 | static void nf_ct_l4proto_unregister_sysctl(struct nf_conntrack_l4proto *l4proto) |
| 256 | { |
| 257 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 258 | if (l4proto->ctl_table_header != NULL && |
| 259 | *l4proto->ctl_table_header != NULL) |
| 260 | nf_ct_unregister_sysctl(l4proto->ctl_table_header, |
| 261 | l4proto->ctl_table, |
| 262 | l4proto->ctl_table_users); |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 263 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
| 264 | if (l4proto->ctl_compat_table_header != NULL) |
| 265 | nf_ct_unregister_sysctl(&l4proto->ctl_compat_table_header, |
| 266 | l4proto->ctl_compat_table, NULL); |
| 267 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 268 | #endif /* CONFIG_SYSCTL */ |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 269 | } |
| 270 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 271 | /* FIXME: Allow NULL functions and sub in pointers to generic for |
| 272 | them. --RR */ |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 273 | int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *l4proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 274 | { |
| 275 | int ret = 0; |
| 276 | |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 277 | if (l4proto->l3proto >= PF_MAX) |
| 278 | return -EBUSY; |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 279 | |
Holger Eitzenberger | d0dba72 | 2009-03-25 18:24:48 +0100 | [diff] [blame] | 280 | if ((l4proto->to_nlattr && !l4proto->nlattr_size) |
| 281 | || (l4proto->tuple_to_nlattr && !l4proto->nlattr_tuple_size)) |
| 282 | return -EINVAL; |
| 283 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 284 | mutex_lock(&nf_ct_proto_mutex); |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 285 | if (!nf_ct_protos[l4proto->l3proto]) { |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 286 | /* l3proto may be loaded latter. */ |
Eric Dumazet | c5d277d | 2010-11-15 19:45:13 +0100 | [diff] [blame] | 287 | struct nf_conntrack_l4proto __rcu **proto_array; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 288 | int i; |
| 289 | |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 290 | proto_array = kmalloc(MAX_NF_CT_PROTO * |
| 291 | sizeof(struct nf_conntrack_l4proto *), |
| 292 | GFP_KERNEL); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 293 | if (proto_array == NULL) { |
| 294 | ret = -ENOMEM; |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 295 | goto out_unlock; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 296 | } |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 297 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 298 | for (i = 0; i < MAX_NF_CT_PROTO; i++) |
Eric Dumazet | c5d277d | 2010-11-15 19:45:13 +0100 | [diff] [blame] | 299 | RCU_INIT_POINTER(proto_array[i], &nf_conntrack_l4proto_generic); |
Eric Dumazet | d817d29 | 2010-10-29 19:59:40 +0200 | [diff] [blame] | 300 | |
| 301 | /* Before making proto_array visible to lockless readers, |
| 302 | * we must make sure its content is committed to memory. |
| 303 | */ |
| 304 | smp_wmb(); |
| 305 | |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 306 | nf_ct_protos[l4proto->l3proto] = proto_array; |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 307 | } else if (rcu_dereference_protected( |
| 308 | nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
| 309 | lockdep_is_held(&nf_ct_proto_mutex) |
| 310 | ) != &nf_conntrack_l4proto_generic) { |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 311 | ret = -EBUSY; |
| 312 | goto out_unlock; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 313 | } |
| 314 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 315 | ret = nf_ct_l4proto_register_sysctl(l4proto); |
| 316 | if (ret < 0) |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 317 | goto out_unlock; |
| 318 | |
Holger Eitzenberger | d0dba72 | 2009-03-25 18:24:48 +0100 | [diff] [blame] | 319 | l4proto->nla_size = 0; |
| 320 | if (l4proto->nlattr_size) |
| 321 | l4proto->nla_size += l4proto->nlattr_size(); |
| 322 | if (l4proto->nlattr_tuple_size) |
| 323 | l4proto->nla_size += 3 * l4proto->nlattr_tuple_size(); |
| 324 | |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 325 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
| 326 | l4proto); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 327 | |
| 328 | out_unlock: |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 329 | mutex_unlock(&nf_ct_proto_mutex); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 330 | return ret; |
| 331 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 332 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_register); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 333 | |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 334 | void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *l4proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 335 | { |
Alexey Dobriyan | 678d667 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 336 | struct net *net; |
| 337 | |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 338 | BUG_ON(l4proto->l3proto >= PF_MAX); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 339 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 340 | mutex_lock(&nf_ct_proto_mutex); |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 341 | BUG_ON(rcu_dereference_protected( |
| 342 | nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
| 343 | lockdep_is_held(&nf_ct_proto_mutex) |
| 344 | ) != l4proto); |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 345 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
| 346 | &nf_conntrack_l4proto_generic); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 347 | nf_ct_l4proto_unregister_sysctl(l4proto); |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 348 | mutex_unlock(&nf_ct_proto_mutex); |
| 349 | |
| 350 | synchronize_rcu(); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 351 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 352 | /* Remove all contrack entries for this protocol */ |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 353 | rtnl_lock(); |
Alexey Dobriyan | 678d667 | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 354 | for_each_net(net) |
| 355 | nf_ct_iterate_cleanup(net, kill_l4proto, l4proto); |
Alexey Dobriyan | efb9a8c | 2008-11-05 03:03:18 -0800 | [diff] [blame] | 356 | rtnl_unlock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 357 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 358 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_unregister); |
Patrick McHardy | ac5357e | 2007-03-14 16:38:25 -0700 | [diff] [blame] | 359 | |
| 360 | int nf_conntrack_proto_init(void) |
| 361 | { |
| 362 | unsigned int i; |
| 363 | int err; |
| 364 | |
| 365 | err = nf_ct_l4proto_register_sysctl(&nf_conntrack_l4proto_generic); |
| 366 | if (err < 0) |
| 367 | return err; |
| 368 | |
| 369 | for (i = 0; i < AF_MAX; i++) |
| 370 | rcu_assign_pointer(nf_ct_l3protos[i], |
| 371 | &nf_conntrack_l3proto_generic); |
| 372 | return 0; |
| 373 | } |
| 374 | |
| 375 | void nf_conntrack_proto_fini(void) |
| 376 | { |
| 377 | unsigned int i; |
| 378 | |
| 379 | nf_ct_l4proto_unregister_sysctl(&nf_conntrack_l4proto_generic); |
| 380 | |
| 381 | /* free l3proto protocol tables */ |
| 382 | for (i = 0; i < PF_MAX; i++) |
| 383 | kfree(nf_ct_protos[i]); |
| 384 | } |