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 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 31 | 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 | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 35 | #ifdef CONFIG_SYSCTL |
| 36 | static DEFINE_MUTEX(nf_ct_proto_sysctl_mutex); |
| 37 | |
| 38 | static int |
| 39 | nf_ct_register_sysctl(struct ctl_table_header **header, struct ctl_table *path, |
| 40 | struct ctl_table *table, unsigned int *users) |
| 41 | { |
| 42 | if (*header == NULL) { |
| 43 | *header = nf_register_sysctl_table(path, table); |
| 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; |
| 58 | nf_unregister_sysctl_table(*header, table); |
| 59 | *header = NULL; |
| 60 | } |
| 61 | #endif |
| 62 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 63 | struct nf_conntrack_l4proto * |
| 64 | __nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 65 | { |
| 66 | if (unlikely(l3proto >= AF_MAX || nf_ct_protos[l3proto] == NULL)) |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 67 | return &nf_conntrack_l4proto_generic; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 68 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 69 | return rcu_dereference(nf_ct_protos[l3proto][l4proto]); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 70 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 71 | EXPORT_SYMBOL_GPL(__nf_ct_l4proto_find); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 72 | |
| 73 | /* this is guaranteed to always return a valid protocol helper, since |
| 74 | * it falls back to generic_protocol */ |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 75 | struct nf_conntrack_l4proto * |
| 76 | 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] | 77 | { |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 78 | struct nf_conntrack_l4proto *p; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 79 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 80 | rcu_read_lock(); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 81 | p = __nf_ct_l4proto_find(l3proto, l4proto); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 82 | if (!try_module_get(p->me)) |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 83 | p = &nf_conntrack_l4proto_generic; |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 84 | rcu_read_unlock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 85 | |
| 86 | return p; |
| 87 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 88 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_find_get); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 89 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 90 | void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 91 | { |
| 92 | module_put(p->me); |
| 93 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 94 | EXPORT_SYMBOL_GPL(nf_ct_l4proto_put); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 95 | |
| 96 | struct nf_conntrack_l3proto * |
| 97 | nf_ct_l3proto_find_get(u_int16_t l3proto) |
| 98 | { |
| 99 | struct nf_conntrack_l3proto *p; |
| 100 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 101 | rcu_read_lock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 102 | p = __nf_ct_l3proto_find(l3proto); |
| 103 | if (!try_module_get(p->me)) |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 104 | p = &nf_conntrack_l3proto_generic; |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 105 | rcu_read_unlock(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 106 | |
| 107 | return p; |
| 108 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 109 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_find_get); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 110 | |
| 111 | void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p) |
| 112 | { |
| 113 | module_put(p->me); |
| 114 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 115 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_put); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 116 | |
| 117 | int |
| 118 | nf_ct_l3proto_try_module_get(unsigned short l3proto) |
| 119 | { |
| 120 | int ret; |
| 121 | struct nf_conntrack_l3proto *p; |
| 122 | |
| 123 | retry: p = nf_ct_l3proto_find_get(l3proto); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 124 | if (p == &nf_conntrack_l3proto_generic) { |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 125 | ret = request_module("nf_conntrack-%d", l3proto); |
| 126 | if (!ret) |
| 127 | goto retry; |
| 128 | |
| 129 | return -EPROTOTYPE; |
| 130 | } |
| 131 | |
| 132 | return 0; |
| 133 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 134 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_try_module_get); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 135 | |
| 136 | void nf_ct_l3proto_module_put(unsigned short l3proto) |
| 137 | { |
| 138 | struct nf_conntrack_l3proto *p; |
| 139 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 140 | /* rcu_read_lock not necessary since the caller holds a reference */ |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 141 | p = __nf_ct_l3proto_find(l3proto); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 142 | module_put(p->me); |
| 143 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 144 | EXPORT_SYMBOL_GPL(nf_ct_l3proto_module_put); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 145 | |
| 146 | static int kill_l3proto(struct nf_conn *i, void *data) |
| 147 | { |
| 148 | return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num == |
| 149 | ((struct nf_conntrack_l3proto *)data)->l3proto); |
| 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; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 156 | return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum == |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 157 | l4proto->l4proto) && |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 158 | (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num == |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 159 | l4proto->l3proto); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 160 | } |
| 161 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 162 | static int nf_ct_l3proto_register_sysctl(struct nf_conntrack_l3proto *l3proto) |
| 163 | { |
| 164 | int err = 0; |
| 165 | |
| 166 | #ifdef CONFIG_SYSCTL |
| 167 | mutex_lock(&nf_ct_proto_sysctl_mutex); |
| 168 | if (l3proto->ctl_table != NULL) { |
| 169 | err = nf_ct_register_sysctl(&l3proto->ctl_table_header, |
| 170 | l3proto->ctl_table_path, |
| 171 | l3proto->ctl_table, NULL); |
| 172 | } |
| 173 | mutex_unlock(&nf_ct_proto_sysctl_mutex); |
| 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 |
| 181 | mutex_lock(&nf_ct_proto_sysctl_mutex); |
| 182 | if (l3proto->ctl_table_header != NULL) |
| 183 | nf_ct_unregister_sysctl(&l3proto->ctl_table_header, |
| 184 | l3proto->ctl_table, NULL); |
| 185 | mutex_unlock(&nf_ct_proto_sysctl_mutex); |
| 186 | #endif |
| 187 | } |
| 188 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 189 | int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto) |
| 190 | { |
| 191 | int ret = 0; |
| 192 | |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 193 | if (proto->l3proto >= AF_MAX) { |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 194 | ret = -EBUSY; |
| 195 | goto out; |
| 196 | } |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 197 | |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 198 | write_lock_bh(&nf_conntrack_lock); |
| 199 | if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_l3proto_generic) { |
| 200 | ret = -EBUSY; |
| 201 | goto out_unlock; |
| 202 | } |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 203 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 204 | write_unlock_bh(&nf_conntrack_lock); |
| 205 | |
| 206 | ret = nf_ct_l3proto_register_sysctl(proto); |
| 207 | if (ret < 0) |
| 208 | nf_conntrack_l3proto_unregister(proto); |
| 209 | return ret; |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 210 | |
| 211 | out_unlock: |
| 212 | write_unlock_bh(&nf_conntrack_lock); |
| 213 | out: |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 214 | return ret; |
| 215 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 216 | EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_register); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 217 | |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 218 | void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 219 | { |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 220 | BUG_ON(proto->l3proto >= AF_MAX); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 221 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 222 | write_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 223 | BUG_ON(nf_ct_l3protos[proto->l3proto] != proto); |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 224 | rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], |
| 225 | &nf_conntrack_l3proto_generic); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 226 | write_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 227 | synchronize_rcu(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 228 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 229 | nf_ct_l3proto_unregister_sysctl(proto); |
| 230 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 231 | /* Remove all contrack entries for this protocol */ |
| 232 | nf_ct_iterate_cleanup(kill_l3proto, proto); |
| 233 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 234 | EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_unregister); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 235 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 236 | static int nf_ct_l4proto_register_sysctl(struct nf_conntrack_l4proto *l4proto) |
| 237 | { |
| 238 | int err = 0; |
| 239 | |
| 240 | #ifdef CONFIG_SYSCTL |
| 241 | mutex_lock(&nf_ct_proto_sysctl_mutex); |
| 242 | if (l4proto->ctl_table != NULL) { |
| 243 | err = nf_ct_register_sysctl(l4proto->ctl_table_header, |
| 244 | nf_net_netfilter_sysctl_path, |
| 245 | l4proto->ctl_table, |
| 246 | l4proto->ctl_table_users); |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 247 | if (err < 0) |
| 248 | goto out; |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 249 | } |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 250 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
| 251 | if (l4proto->ctl_compat_table != NULL) { |
| 252 | err = nf_ct_register_sysctl(&l4proto->ctl_compat_table_header, |
| 253 | nf_net_ipv4_netfilter_sysctl_path, |
| 254 | l4proto->ctl_compat_table, NULL); |
| 255 | if (err == 0) |
| 256 | goto out; |
| 257 | nf_ct_unregister_sysctl(l4proto->ctl_table_header, |
| 258 | l4proto->ctl_table, |
| 259 | l4proto->ctl_table_users); |
| 260 | } |
| 261 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
| 262 | out: |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 263 | mutex_unlock(&nf_ct_proto_sysctl_mutex); |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 264 | #endif /* CONFIG_SYSCTL */ |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 265 | return err; |
| 266 | } |
| 267 | |
| 268 | static void nf_ct_l4proto_unregister_sysctl(struct nf_conntrack_l4proto *l4proto) |
| 269 | { |
| 270 | #ifdef CONFIG_SYSCTL |
| 271 | mutex_lock(&nf_ct_proto_sysctl_mutex); |
| 272 | if (l4proto->ctl_table_header != NULL && |
| 273 | *l4proto->ctl_table_header != NULL) |
| 274 | nf_ct_unregister_sysctl(l4proto->ctl_table_header, |
| 275 | l4proto->ctl_table, |
| 276 | l4proto->ctl_table_users); |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 277 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
| 278 | if (l4proto->ctl_compat_table_header != NULL) |
| 279 | nf_ct_unregister_sysctl(&l4proto->ctl_compat_table_header, |
| 280 | l4proto->ctl_compat_table, NULL); |
| 281 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 282 | mutex_unlock(&nf_ct_proto_sysctl_mutex); |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 283 | #endif /* CONFIG_SYSCTL */ |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 284 | } |
| 285 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 286 | /* FIXME: Allow NULL functions and sub in pointers to generic for |
| 287 | them. --RR */ |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 288 | int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *l4proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 289 | { |
| 290 | int ret = 0; |
| 291 | |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 292 | if (l4proto->l3proto >= PF_MAX) { |
| 293 | ret = -EBUSY; |
| 294 | goto out; |
| 295 | } |
| 296 | |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 297 | if (l4proto == &nf_conntrack_l4proto_generic) |
| 298 | return nf_ct_l4proto_register_sysctl(l4proto); |
| 299 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 300 | retry: |
| 301 | write_lock_bh(&nf_conntrack_lock); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 302 | if (nf_ct_protos[l4proto->l3proto]) { |
| 303 | if (nf_ct_protos[l4proto->l3proto][l4proto->l4proto] |
| 304 | != &nf_conntrack_l4proto_generic) { |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 305 | ret = -EBUSY; |
| 306 | goto out_unlock; |
| 307 | } |
| 308 | } else { |
| 309 | /* l3proto may be loaded latter. */ |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 310 | struct nf_conntrack_l4proto **proto_array; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 311 | int i; |
| 312 | |
| 313 | write_unlock_bh(&nf_conntrack_lock); |
| 314 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 315 | proto_array = (struct nf_conntrack_l4proto **) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 316 | kmalloc(MAX_NF_CT_PROTO * |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 317 | sizeof(struct nf_conntrack_l4proto *), |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 318 | GFP_KERNEL); |
| 319 | if (proto_array == NULL) { |
| 320 | ret = -ENOMEM; |
| 321 | goto out; |
| 322 | } |
| 323 | for (i = 0; i < MAX_NF_CT_PROTO; i++) |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 324 | proto_array[i] = &nf_conntrack_l4proto_generic; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 325 | |
| 326 | write_lock_bh(&nf_conntrack_lock); |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 327 | if (nf_ct_protos[l4proto->l3proto]) { |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 328 | /* bad timing, but no problem */ |
| 329 | write_unlock_bh(&nf_conntrack_lock); |
| 330 | kfree(proto_array); |
| 331 | } else { |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 332 | nf_ct_protos[l4proto->l3proto] = proto_array; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 333 | write_unlock_bh(&nf_conntrack_lock); |
| 334 | } |
| 335 | |
| 336 | /* |
| 337 | * Just once because array is never freed until unloading |
| 338 | * nf_conntrack.ko |
| 339 | */ |
| 340 | goto retry; |
| 341 | } |
| 342 | |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 343 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], l4proto); |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 344 | write_unlock_bh(&nf_conntrack_lock); |
| 345 | |
| 346 | ret = nf_ct_l4proto_register_sysctl(l4proto); |
| 347 | if (ret < 0) |
| 348 | nf_conntrack_l4proto_unregister(l4proto); |
| 349 | return ret; |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 350 | |
| 351 | out_unlock: |
| 352 | write_unlock_bh(&nf_conntrack_lock); |
| 353 | out: |
| 354 | return ret; |
| 355 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 356 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_register); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 357 | |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 358 | void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *l4proto) |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 359 | { |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 360 | BUG_ON(l4proto->l3proto >= PF_MAX); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 361 | |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 362 | if (l4proto == &nf_conntrack_l4proto_generic) { |
| 363 | nf_ct_l4proto_unregister_sysctl(l4proto); |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 364 | return; |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 365 | } |
| 366 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 367 | write_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | fe3eb20 | 2007-02-12 11:14:28 -0800 | [diff] [blame] | 368 | BUG_ON(nf_ct_protos[l4proto->l3proto][l4proto->l4proto] != l4proto); |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 369 | rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], |
| 370 | &nf_conntrack_l4proto_generic); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 371 | write_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | 923f490 | 2007-02-12 11:12:57 -0800 | [diff] [blame] | 372 | synchronize_rcu(); |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 373 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 374 | nf_ct_l4proto_unregister_sysctl(l4proto); |
| 375 | |
Martin Josefsson | 8f03dea | 2006-11-29 02:35:03 +0100 | [diff] [blame] | 376 | /* Remove all contrack entries for this protocol */ |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 377 | nf_ct_iterate_cleanup(kill_l4proto, l4proto); |
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); |