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> |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 15 | #include <linux/mutex.h> |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 16 | #include <linux/skbuff.h> |
| 17 | #include <linux/vmalloc.h> |
| 18 | #include <linux/stddef.h> |
| 19 | #include <linux/err.h> |
| 20 | #include <linux/percpu.h> |
| 21 | #include <linux/moduleparam.h> |
| 22 | #include <linux/notifier.h> |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/netdevice.h> |
| 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 | |
Adrian Bunk | 42bad1d | 2007-04-26 00:57:41 -0700 | [diff] [blame] | 31 | static struct nf_conntrack_l4proto **nf_ct_protos[PF_MAX] __read_mostly; |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 32 | struct nf_conntrack_l3proto *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 | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 76 | struct nf_conntrack_l4proto * |
| 77 | nf_ct_l4proto_find_get(u_int16_t l3proto, u_int8_t l4proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 78 | { |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 79 | struct nf_conntrack_l4proto *p; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 80 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 81 | rcu_read_lock(); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 82 | p = __nf_ct_l4proto_find(l3proto, l4proto); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 83 | if (!try_module_get(p->me)) |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 84 | p = &nf_conntrack_l4proto_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_l4proto_find_get); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 90 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 91 | void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 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_l4proto_put); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 96 | |
| 97 | struct nf_conntrack_l3proto * |
| 98 | nf_ct_l3proto_find_get(u_int16_t l3proto) |
| 99 | { |
| 100 | struct nf_conntrack_l3proto *p; |
| 101 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 102 | rcu_read_lock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 103 | p = __nf_ct_l3proto_find(l3proto); |
| 104 | if (!try_module_get(p->me)) |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 105 | p = &nf_conntrack_l3proto_generic; |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 106 | rcu_read_unlock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 107 | |
| 108 | return p; |
| 109 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 110 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_find_get); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 111 | |
| 112 | void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p) |
| 113 | { |
| 114 | module_put(p->me); |
| 115 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 116 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_put); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 117 | |
| 118 | int |
| 119 | nf_ct_l3proto_try_module_get(unsigned short l3proto) |
| 120 | { |
| 121 | int ret; |
| 122 | struct nf_conntrack_l3proto *p; |
| 123 | |
| 124 | retry: p = nf_ct_l3proto_find_get(l3proto); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 125 | if (p == &nf_conntrack_l3proto_generic) { |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 126 | ret = request_module("nf_conntrack-%d", l3proto); |
| 127 | if (!ret) |
| 128 | goto retry; |
| 129 | |
| 130 | return -EPROTOTYPE; |
| 131 | } |
| 132 | |
| 133 | return 0; |
| 134 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 135 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_try_module_get); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 136 | |
| 137 | void nf_ct_l3proto_module_put(unsigned short l3proto) |
| 138 | { |
| 139 | struct nf_conntrack_l3proto *p; |
| 140 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 141 | /* rcu_read_lock not necessary since the caller holds a reference */ |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 142 | p = __nf_ct_l3proto_find(l3proto); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 143 | module_put(p->me); |
| 144 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 145 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_module_put); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 146 | |
| 147 | static int kill_l3proto(struct nf_conn *i, void *data) |
| 148 | { |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 149 | return nf_ct_l3num(i) == ((struct nf_conntrack_l3proto *)data)->l3proto; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 150 | } |
| 151 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 152 | static int kill_l4proto(struct nf_conn *i, void *data) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 153 | { |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 154 | struct nf_conntrack_l4proto *l4proto; |
| 155 | l4proto = (struct nf_conntrack_l4proto *)data; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 156 | return nf_ct_protonum(i) == l4proto->l4proto && |
| 157 | nf_ct_l3num(i) == l4proto->l3proto; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 158 | } |
| 159 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 160 | static int nf_ct_l3proto_register_sysctl(struct nf_conntrack_l3proto *l3proto) |
| 161 | { |
| 162 | int err = 0; |
| 163 | |
| 164 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 165 | if (l3proto->ctl_table != NULL) { |
| 166 | err = nf_ct_register_sysctl(&l3proto->ctl_table_header, |
| 167 | l3proto->ctl_table_path, |
| 168 | l3proto->ctl_table, NULL); |
| 169 | } |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 170 | #endif |
| 171 | return err; |
| 172 | } |
| 173 | |
| 174 | static void nf_ct_l3proto_unregister_sysctl(struct nf_conntrack_l3proto *l3proto) |
| 175 | { |
| 176 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 177 | if (l3proto->ctl_table_header != NULL) |
| 178 | nf_ct_unregister_sysctl(&l3proto->ctl_table_header, |
| 179 | l3proto->ctl_table, NULL); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 180 | #endif |
| 181 | } |
| 182 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 183 | int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto) |
| 184 | { |
| 185 | int ret = 0; |
| 186 | |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 187 | if (proto->l3proto >= AF_MAX) |
| 188 | return -EBUSY; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 189 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 190 | mutex_lock(&nf_ct_proto_mutex); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 191 | if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_l3proto_generic) { |
| 192 | ret = -EBUSY; |
| 193 | goto out_unlock; |
| 194 | } |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 195 | |
| 196 | ret = nf_ct_l3proto_register_sysctl(proto); |
| 197 | if (ret < 0) |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 198 | goto out_unlock; |
| 199 | |
| 200 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 201 | |
| 202 | out_unlock: |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 203 | mutex_unlock(&nf_ct_proto_mutex); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 204 | return ret; |
| 205 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 206 | EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_register); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 207 | |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 208 | void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 209 | { |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 210 | BUG_ON(proto->l3proto >= AF_MAX); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 211 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 212 | mutex_lock(&nf_ct_proto_mutex); |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 213 | BUG_ON(nf_ct_l3protos[proto->l3proto] != proto); |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 214 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], |
| 215 | &nf_conntrack_l3proto_generic); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 216 | nf_ct_l3proto_unregister_sysctl(proto); |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 217 | mutex_unlock(&nf_ct_proto_mutex); |
| 218 | |
| 219 | synchronize_rcu(); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 220 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 221 | /* Remove all contrack entries for this protocol */ |
| 222 | nf_ct_iterate_cleanup(kill_l3proto, proto); |
| 223 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 224 | EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_unregister); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 225 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 226 | static int nf_ct_l4proto_register_sysctl(struct nf_conntrack_l4proto *l4proto) |
| 227 | { |
| 228 | int err = 0; |
| 229 | |
| 230 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 231 | if (l4proto->ctl_table != NULL) { |
| 232 | err = nf_ct_register_sysctl(l4proto->ctl_table_header, |
| 233 | nf_net_netfilter_sysctl_path, |
| 234 | l4proto->ctl_table, |
| 235 | l4proto->ctl_table_users); |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 236 | if (err < 0) |
| 237 | goto out; |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 238 | } |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 239 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
| 240 | if (l4proto->ctl_compat_table != NULL) { |
| 241 | err = nf_ct_register_sysctl(&l4proto->ctl_compat_table_header, |
| 242 | nf_net_ipv4_netfilter_sysctl_path, |
| 243 | l4proto->ctl_compat_table, NULL); |
| 244 | if (err == 0) |
| 245 | goto out; |
| 246 | nf_ct_unregister_sysctl(l4proto->ctl_table_header, |
| 247 | l4proto->ctl_table, |
| 248 | l4proto->ctl_table_users); |
| 249 | } |
| 250 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
| 251 | out: |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 252 | #endif /* CONFIG_SYSCTL */ |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 253 | return err; |
| 254 | } |
| 255 | |
| 256 | static void nf_ct_l4proto_unregister_sysctl(struct nf_conntrack_l4proto *l4proto) |
| 257 | { |
| 258 | #ifdef CONFIG_SYSCTL |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 259 | if (l4proto->ctl_table_header != NULL && |
| 260 | *l4proto->ctl_table_header != NULL) |
| 261 | nf_ct_unregister_sysctl(l4proto->ctl_table_header, |
| 262 | l4proto->ctl_table, |
| 263 | l4proto->ctl_table_users); |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 264 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
| 265 | if (l4proto->ctl_compat_table_header != NULL) |
| 266 | nf_ct_unregister_sysctl(&l4proto->ctl_compat_table_header, |
| 267 | l4proto->ctl_compat_table, NULL); |
| 268 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 269 | #endif /* CONFIG_SYSCTL */ |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 270 | } |
| 271 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 272 | /* FIXME: Allow NULL functions and sub in pointers to generic for |
| 273 | them. --RR */ |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 274 | int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *l4proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 275 | { |
| 276 | int ret = 0; |
| 277 | |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 278 | if (l4proto->l3proto >= PF_MAX) |
| 279 | return -EBUSY; |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 280 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 281 | mutex_lock(&nf_ct_proto_mutex); |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 282 | if (!nf_ct_protos[l4proto->l3proto]) { |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 283 | /* l3proto may be loaded latter. */ |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 284 | struct nf_conntrack_l4proto **proto_array; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 285 | int i; |
| 286 | |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 287 | proto_array = kmalloc(MAX_NF_CT_PROTO * |
| 288 | sizeof(struct nf_conntrack_l4proto *), |
| 289 | GFP_KERNEL); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 290 | if (proto_array == NULL) { |
| 291 | ret = -ENOMEM; |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 292 | goto out_unlock; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 293 | } |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 294 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 295 | for (i = 0; i < MAX_NF_CT_PROTO; i++) |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 296 | proto_array[i] = &nf_conntrack_l4proto_generic; |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 297 | nf_ct_protos[l4proto->l3proto] = proto_array; |
| 298 | } else if (nf_ct_protos[l4proto->l3proto][l4proto->l4proto] != |
| 299 | &nf_conntrack_l4proto_generic) { |
| 300 | ret = -EBUSY; |
| 301 | goto out_unlock; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 302 | } |
| 303 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 304 | ret = nf_ct_l4proto_register_sysctl(l4proto); |
| 305 | if (ret < 0) |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 306 | goto out_unlock; |
| 307 | |
Patrick McHardy | c6a1e61 | 2007-03-14 16:39:07 -0700 | [diff] [blame] | 308 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
| 309 | l4proto); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 310 | |
| 311 | out_unlock: |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 312 | mutex_unlock(&nf_ct_proto_mutex); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 313 | return ret; |
| 314 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 315 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_register); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 316 | |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 317 | void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *l4proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 318 | { |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 319 | BUG_ON(l4proto->l3proto >= PF_MAX); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 320 | |
Patrick McHardy | b19caa0 | 2007-03-14 16:37:52 -0700 | [diff] [blame] | 321 | mutex_lock(&nf_ct_proto_mutex); |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 322 | BUG_ON(nf_ct_protos[l4proto->l3proto][l4proto->l4proto] != l4proto); |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 323 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
| 324 | &nf_conntrack_l4proto_generic); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 325 | nf_ct_l4proto_unregister_sysctl(l4proto); |
Patrick McHardy | 0661cca | 2007-03-14 16:38:48 -0700 | [diff] [blame] | 326 | mutex_unlock(&nf_ct_proto_mutex); |
| 327 | |
| 328 | synchronize_rcu(); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 329 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 330 | /* Remove all contrack entries for this protocol */ |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 331 | nf_ct_iterate_cleanup(kill_l4proto, l4proto); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 332 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 333 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_unregister); |
Patrick McHardy | ac5357e | 2007-03-14 16:38:25 -0700 | [diff] [blame] | 334 | |
| 335 | int nf_conntrack_proto_init(void) |
| 336 | { |
| 337 | unsigned int i; |
| 338 | int err; |
| 339 | |
| 340 | err = nf_ct_l4proto_register_sysctl(&nf_conntrack_l4proto_generic); |
| 341 | if (err < 0) |
| 342 | return err; |
| 343 | |
| 344 | for (i = 0; i < AF_MAX; i++) |
| 345 | rcu_assign_pointer(nf_ct_l3protos[i], |
| 346 | &nf_conntrack_l3proto_generic); |
| 347 | return 0; |
| 348 | } |
| 349 | |
| 350 | void nf_conntrack_proto_fini(void) |
| 351 | { |
| 352 | unsigned int i; |
| 353 | |
| 354 | nf_ct_l4proto_unregister_sysctl(&nf_conntrack_l4proto_generic); |
| 355 | |
| 356 | /* free l3proto protocol tables */ |
| 357 | for (i = 0; i < PF_MAX; i++) |
| 358 | kfree(nf_ct_protos[i]); |
| 359 | } |